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alistair23-linux/drivers/usb/dwc2/hcd.c
William Wu af424a4107 usb: dwc2: alloc dma aligned buffer for isoc split in 
The commit 3bc04e28a0 ("usb: dwc2: host: Get aligned DMA in
a more supported way") rips out a lot of code to simply the
allocation of aligned DMA. However, it also introduces a new
issue when use isoc split in transfer.

In my test case, I connect the dwc2 controller with an usb hs
Hub (GL852G-12), and plug an usb fs audio device (Plantronics
headset) into the downstream port of Hub. Then use the usb mic
to record, we can find noise when playback.

It's because that the usb Hub uses an MDATA for the first
transaction and a DATA0 for the second transaction for the isoc
split in transaction. An typical isoc split in transaction sequence
like this:

- SSPLIT IN transaction
- CSPLIT IN transaction
  - MDATA packet
- CSPLIT IN transaction
  - DATA0 packet

The DMA address of MDATA (urb->dma) is always DWORD-aligned, but
the DMA address of DATA0 (urb->dma + qtd->isoc_split_offset) may
not be DWORD-aligned, it depends on the qtd->isoc_split_offset (the
length of MDATA). In my test case, the length of MDATA is usually
unaligned, this cause DATA0 packet transmission error.

This patch use kmem_cache to allocate aligned DMA buf for isoc
split in transaction. Note that according to usb 2.0 spec, the
maximum data payload size is 1023 bytes for each fs isoc ep,
and the maximum allowable interrupt data payload size is 64 bytes
or less for fs interrupt ep. So we set the size of object to be
1024 bytes in the kmem cache.

Tested-by: Gevorg Sahakyan <sahakyan@synopsys.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Minas Harutyunyan hminas@synopsys.com>
Signed-off-by: William Wu <william.wu@rock-chips.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2018-06-19 12:48:13 +03:00

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// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
* hcd.c - DesignWare HS OTG Controller host-mode routines
*
* Copyright (C) 2004-2013 Synopsys, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the above-listed copyright holders may not be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* ALTERNATIVELY, this software may be distributed under the terms of the
* GNU General Public License ("GPL") as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file contains the core HCD code, and implements the Linux hc_driver
* API
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/ch11.h>
#include "core.h"
#include "hcd.h"
static void dwc2_port_resume(struct dwc2_hsotg *hsotg);
/*
* =========================================================================
* Host Core Layer Functions
* =========================================================================
*/
/**
* dwc2_enable_common_interrupts() - Initializes the commmon interrupts,
* used in both device and host modes
*
* @hsotg: Programming view of the DWC_otg controller
*/
static void dwc2_enable_common_interrupts(struct dwc2_hsotg *hsotg)
{
u32 intmsk;
/* Clear any pending OTG Interrupts */
dwc2_writel(0xffffffff, hsotg->regs + GOTGINT);
/* Clear any pending interrupts */
dwc2_writel(0xffffffff, hsotg->regs + GINTSTS);
/* Enable the interrupts in the GINTMSK */
intmsk = GINTSTS_MODEMIS | GINTSTS_OTGINT;
if (!hsotg->params.host_dma)
intmsk |= GINTSTS_RXFLVL;
if (!hsotg->params.external_id_pin_ctl)
intmsk |= GINTSTS_CONIDSTSCHNG;
intmsk |= GINTSTS_WKUPINT | GINTSTS_USBSUSP |
GINTSTS_SESSREQINT;
if (dwc2_is_device_mode(hsotg) && hsotg->params.lpm)
intmsk |= GINTSTS_LPMTRANRCVD;
dwc2_writel(intmsk, hsotg->regs + GINTMSK);
}
/*
* Initializes the FSLSPClkSel field of the HCFG register depending on the
* PHY type
*/
static void dwc2_init_fs_ls_pclk_sel(struct dwc2_hsotg *hsotg)
{
u32 hcfg, val;
if ((hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI &&
hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED &&
hsotg->params.ulpi_fs_ls) ||
hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) {
/* Full speed PHY */
val = HCFG_FSLSPCLKSEL_48_MHZ;
} else {
/* High speed PHY running at full speed or high speed */
val = HCFG_FSLSPCLKSEL_30_60_MHZ;
}
dev_dbg(hsotg->dev, "Initializing HCFG.FSLSPClkSel to %08x\n", val);
hcfg = dwc2_readl(hsotg->regs + HCFG);
hcfg &= ~HCFG_FSLSPCLKSEL_MASK;
hcfg |= val << HCFG_FSLSPCLKSEL_SHIFT;
dwc2_writel(hcfg, hsotg->regs + HCFG);
}
static int dwc2_fs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
{
u32 usbcfg, ggpio, i2cctl;
int retval = 0;
/*
* core_init() is now called on every switch so only call the
* following for the first time through
*/
if (select_phy) {
dev_dbg(hsotg->dev, "FS PHY selected\n");
usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
if (!(usbcfg & GUSBCFG_PHYSEL)) {
usbcfg |= GUSBCFG_PHYSEL;
dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
/* Reset after a PHY select */
retval = dwc2_core_reset(hsotg, false);
if (retval) {
dev_err(hsotg->dev,
"%s: Reset failed, aborting", __func__);
return retval;
}
}
if (hsotg->params.activate_stm_fs_transceiver) {
ggpio = dwc2_readl(hsotg->regs + GGPIO);
if (!(ggpio & GGPIO_STM32_OTG_GCCFG_PWRDWN)) {
dev_dbg(hsotg->dev, "Activating transceiver\n");
/*
* STM32F4x9 uses the GGPIO register as general
* core configuration register.
*/
ggpio |= GGPIO_STM32_OTG_GCCFG_PWRDWN;
dwc2_writel(ggpio, hsotg->regs + GGPIO);
}
}
}
/*
* Program DCFG.DevSpd or HCFG.FSLSPclkSel to 48Mhz in FS. Also
* do this on HNP Dev/Host mode switches (done in dev_init and
* host_init).
*/
if (dwc2_is_host_mode(hsotg))
dwc2_init_fs_ls_pclk_sel(hsotg);
if (hsotg->params.i2c_enable) {
dev_dbg(hsotg->dev, "FS PHY enabling I2C\n");
/* Program GUSBCFG.OtgUtmiFsSel to I2C */
usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
usbcfg |= GUSBCFG_OTG_UTMI_FS_SEL;
dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
/* Program GI2CCTL.I2CEn */
i2cctl = dwc2_readl(hsotg->regs + GI2CCTL);
i2cctl &= ~GI2CCTL_I2CDEVADDR_MASK;
i2cctl |= 1 << GI2CCTL_I2CDEVADDR_SHIFT;
i2cctl &= ~GI2CCTL_I2CEN;
dwc2_writel(i2cctl, hsotg->regs + GI2CCTL);
i2cctl |= GI2CCTL_I2CEN;
dwc2_writel(i2cctl, hsotg->regs + GI2CCTL);
}
return retval;
}
static int dwc2_hs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
{
u32 usbcfg, usbcfg_old;
int retval = 0;
if (!select_phy)
return 0;
usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
usbcfg_old = usbcfg;
/*
* HS PHY parameters. These parameters are preserved during soft reset
* so only program the first time. Do a soft reset immediately after
* setting phyif.
*/
switch (hsotg->params.phy_type) {
case DWC2_PHY_TYPE_PARAM_ULPI:
/* ULPI interface */
dev_dbg(hsotg->dev, "HS ULPI PHY selected\n");
usbcfg |= GUSBCFG_ULPI_UTMI_SEL;
usbcfg &= ~(GUSBCFG_PHYIF16 | GUSBCFG_DDRSEL);
if (hsotg->params.phy_ulpi_ddr)
usbcfg |= GUSBCFG_DDRSEL;
/* Set external VBUS indicator as needed. */
if (hsotg->params.oc_disable)
usbcfg |= (GUSBCFG_ULPI_INT_VBUS_IND |
GUSBCFG_INDICATORPASSTHROUGH);
break;
case DWC2_PHY_TYPE_PARAM_UTMI:
/* UTMI+ interface */
dev_dbg(hsotg->dev, "HS UTMI+ PHY selected\n");
usbcfg &= ~(GUSBCFG_ULPI_UTMI_SEL | GUSBCFG_PHYIF16);
if (hsotg->params.phy_utmi_width == 16)
usbcfg |= GUSBCFG_PHYIF16;
break;
default:
dev_err(hsotg->dev, "FS PHY selected at HS!\n");
break;
}
if (usbcfg != usbcfg_old) {
dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
/* Reset after setting the PHY parameters */
retval = dwc2_core_reset(hsotg, false);
if (retval) {
dev_err(hsotg->dev,
"%s: Reset failed, aborting", __func__);
return retval;
}
}
return retval;
}
static int dwc2_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
{
u32 usbcfg;
int retval = 0;
if ((hsotg->params.speed == DWC2_SPEED_PARAM_FULL ||
hsotg->params.speed == DWC2_SPEED_PARAM_LOW) &&
hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) {
/* If FS/LS mode with FS/LS PHY */
retval = dwc2_fs_phy_init(hsotg, select_phy);
if (retval)
return retval;
} else {
/* High speed PHY */
retval = dwc2_hs_phy_init(hsotg, select_phy);
if (retval)
return retval;
}
if (hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI &&
hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED &&
hsotg->params.ulpi_fs_ls) {
dev_dbg(hsotg->dev, "Setting ULPI FSLS\n");
usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
usbcfg |= GUSBCFG_ULPI_FS_LS;
usbcfg |= GUSBCFG_ULPI_CLK_SUSP_M;
dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
} else {
usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
usbcfg &= ~GUSBCFG_ULPI_FS_LS;
usbcfg &= ~GUSBCFG_ULPI_CLK_SUSP_M;
dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
}
return retval;
}
static int dwc2_gahbcfg_init(struct dwc2_hsotg *hsotg)
{
u32 ahbcfg = dwc2_readl(hsotg->regs + GAHBCFG);
switch (hsotg->hw_params.arch) {
case GHWCFG2_EXT_DMA_ARCH:
dev_err(hsotg->dev, "External DMA Mode not supported\n");
return -EINVAL;
case GHWCFG2_INT_DMA_ARCH:
dev_dbg(hsotg->dev, "Internal DMA Mode\n");
if (hsotg->params.ahbcfg != -1) {
ahbcfg &= GAHBCFG_CTRL_MASK;
ahbcfg |= hsotg->params.ahbcfg &
~GAHBCFG_CTRL_MASK;
}
break;
case GHWCFG2_SLAVE_ONLY_ARCH:
default:
dev_dbg(hsotg->dev, "Slave Only Mode\n");
break;
}
if (hsotg->params.host_dma)
ahbcfg |= GAHBCFG_DMA_EN;
else
hsotg->params.dma_desc_enable = false;
dwc2_writel(ahbcfg, hsotg->regs + GAHBCFG);
return 0;
}
static void dwc2_gusbcfg_init(struct dwc2_hsotg *hsotg)
{
u32 usbcfg;
usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
usbcfg &= ~(GUSBCFG_HNPCAP | GUSBCFG_SRPCAP);
switch (hsotg->hw_params.op_mode) {
case GHWCFG2_OP_MODE_HNP_SRP_CAPABLE:
if (hsotg->params.otg_cap ==
DWC2_CAP_PARAM_HNP_SRP_CAPABLE)
usbcfg |= GUSBCFG_HNPCAP;
if (hsotg->params.otg_cap !=
DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE)
usbcfg |= GUSBCFG_SRPCAP;
break;
case GHWCFG2_OP_MODE_SRP_ONLY_CAPABLE:
case GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE:
case GHWCFG2_OP_MODE_SRP_CAPABLE_HOST:
if (hsotg->params.otg_cap !=
DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE)
usbcfg |= GUSBCFG_SRPCAP;
break;
case GHWCFG2_OP_MODE_NO_HNP_SRP_CAPABLE:
case GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE:
case GHWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST:
default:
break;
}
dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
}
static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
{
int ret;
hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
if (IS_ERR(hsotg->vbus_supply)) {
ret = PTR_ERR(hsotg->vbus_supply);
hsotg->vbus_supply = NULL;
return ret == -ENODEV ? 0 : ret;
}
return regulator_enable(hsotg->vbus_supply);
}
static int dwc2_vbus_supply_exit(struct dwc2_hsotg *hsotg)
{
if (hsotg->vbus_supply)
return regulator_disable(hsotg->vbus_supply);
return 0;
}
/**
* dwc2_enable_host_interrupts() - Enables the Host mode interrupts
*
* @hsotg: Programming view of DWC_otg controller
*/
static void dwc2_enable_host_interrupts(struct dwc2_hsotg *hsotg)
{
u32 intmsk;
dev_dbg(hsotg->dev, "%s()\n", __func__);
/* Disable all interrupts */
dwc2_writel(0, hsotg->regs + GINTMSK);
dwc2_writel(0, hsotg->regs + HAINTMSK);
/* Enable the common interrupts */
dwc2_enable_common_interrupts(hsotg);
/* Enable host mode interrupts without disturbing common interrupts */
intmsk = dwc2_readl(hsotg->regs + GINTMSK);
intmsk |= GINTSTS_DISCONNINT | GINTSTS_PRTINT | GINTSTS_HCHINT;
dwc2_writel(intmsk, hsotg->regs + GINTMSK);
}
/**
* dwc2_disable_host_interrupts() - Disables the Host Mode interrupts
*
* @hsotg: Programming view of DWC_otg controller
*/
static void dwc2_disable_host_interrupts(struct dwc2_hsotg *hsotg)
{
u32 intmsk = dwc2_readl(hsotg->regs + GINTMSK);
/* Disable host mode interrupts without disturbing common interrupts */
intmsk &= ~(GINTSTS_SOF | GINTSTS_PRTINT | GINTSTS_HCHINT |
GINTSTS_PTXFEMP | GINTSTS_NPTXFEMP | GINTSTS_DISCONNINT);
dwc2_writel(intmsk, hsotg->regs + GINTMSK);
}
/*
* dwc2_calculate_dynamic_fifo() - Calculates the default fifo size
* For system that have a total fifo depth that is smaller than the default
* RX + TX fifo size.
*
* @hsotg: Programming view of DWC_otg controller
*/
static void dwc2_calculate_dynamic_fifo(struct dwc2_hsotg *hsotg)
{
struct dwc2_core_params *params = &hsotg->params;
struct dwc2_hw_params *hw = &hsotg->hw_params;
u32 rxfsiz, nptxfsiz, ptxfsiz, total_fifo_size;
total_fifo_size = hw->total_fifo_size;
rxfsiz = params->host_rx_fifo_size;
nptxfsiz = params->host_nperio_tx_fifo_size;
ptxfsiz = params->host_perio_tx_fifo_size;
/*
* Will use Method 2 defined in the DWC2 spec: minimum FIFO depth
* allocation with support for high bandwidth endpoints. Synopsys
* defines MPS(Max Packet size) for a periodic EP=1024, and for
* non-periodic as 512.
*/
if (total_fifo_size < (rxfsiz + nptxfsiz + ptxfsiz)) {
/*
* For Buffer DMA mode/Scatter Gather DMA mode
* 2 * ((Largest Packet size / 4) + 1 + 1) + n
* with n = number of host channel.
* 2 * ((1024/4) + 2) = 516
*/
rxfsiz = 516 + hw->host_channels;
/*
* min non-periodic tx fifo depth
* 2 * (largest non-periodic USB packet used / 4)
* 2 * (512/4) = 256
*/
nptxfsiz = 256;
/*
* min periodic tx fifo depth
* (largest packet size*MC)/4
* (1024 * 3)/4 = 768
*/
ptxfsiz = 768;
params->host_rx_fifo_size = rxfsiz;
params->host_nperio_tx_fifo_size = nptxfsiz;
params->host_perio_tx_fifo_size = ptxfsiz;
}
/*
* If the summation of RX, NPTX and PTX fifo sizes is still
* bigger than the total_fifo_size, then we have a problem.
*
* We won't be able to allocate as many endpoints. Right now,
* we're just printing an error message, but ideally this FIFO
* allocation algorithm would be improved in the future.
*
* FIXME improve this FIFO allocation algorithm.
*/
if (unlikely(total_fifo_size < (rxfsiz + nptxfsiz + ptxfsiz)))
dev_err(hsotg->dev, "invalid fifo sizes\n");
}
static void dwc2_config_fifos(struct dwc2_hsotg *hsotg)
{
struct dwc2_core_params *params = &hsotg->params;
u32 nptxfsiz, hptxfsiz, dfifocfg, grxfsiz;
if (!params->enable_dynamic_fifo)
return;
dwc2_calculate_dynamic_fifo(hsotg);
/* Rx FIFO */
grxfsiz = dwc2_readl(hsotg->regs + GRXFSIZ);
dev_dbg(hsotg->dev, "initial grxfsiz=%08x\n", grxfsiz);
grxfsiz &= ~GRXFSIZ_DEPTH_MASK;
grxfsiz |= params->host_rx_fifo_size <<
GRXFSIZ_DEPTH_SHIFT & GRXFSIZ_DEPTH_MASK;
dwc2_writel(grxfsiz, hsotg->regs + GRXFSIZ);
dev_dbg(hsotg->dev, "new grxfsiz=%08x\n",
dwc2_readl(hsotg->regs + GRXFSIZ));
/* Non-periodic Tx FIFO */
dev_dbg(hsotg->dev, "initial gnptxfsiz=%08x\n",
dwc2_readl(hsotg->regs + GNPTXFSIZ));
nptxfsiz = params->host_nperio_tx_fifo_size <<
FIFOSIZE_DEPTH_SHIFT & FIFOSIZE_DEPTH_MASK;
nptxfsiz |= params->host_rx_fifo_size <<
FIFOSIZE_STARTADDR_SHIFT & FIFOSIZE_STARTADDR_MASK;
dwc2_writel(nptxfsiz, hsotg->regs + GNPTXFSIZ);
dev_dbg(hsotg->dev, "new gnptxfsiz=%08x\n",
dwc2_readl(hsotg->regs + GNPTXFSIZ));
/* Periodic Tx FIFO */
dev_dbg(hsotg->dev, "initial hptxfsiz=%08x\n",
dwc2_readl(hsotg->regs + HPTXFSIZ));
hptxfsiz = params->host_perio_tx_fifo_size <<
FIFOSIZE_DEPTH_SHIFT & FIFOSIZE_DEPTH_MASK;
hptxfsiz |= (params->host_rx_fifo_size +
params->host_nperio_tx_fifo_size) <<
FIFOSIZE_STARTADDR_SHIFT & FIFOSIZE_STARTADDR_MASK;
dwc2_writel(hptxfsiz, hsotg->regs + HPTXFSIZ);
dev_dbg(hsotg->dev, "new hptxfsiz=%08x\n",
dwc2_readl(hsotg->regs + HPTXFSIZ));
if (hsotg->params.en_multiple_tx_fifo &&
hsotg->hw_params.snpsid >= DWC2_CORE_REV_2_91a) {
/*
* This feature was implemented in 2.91a version
* Global DFIFOCFG calculation for Host mode -
* include RxFIFO, NPTXFIFO and HPTXFIFO
*/
dfifocfg = dwc2_readl(hsotg->regs + GDFIFOCFG);
dfifocfg &= ~GDFIFOCFG_EPINFOBASE_MASK;
dfifocfg |= (params->host_rx_fifo_size +
params->host_nperio_tx_fifo_size +
params->host_perio_tx_fifo_size) <<
GDFIFOCFG_EPINFOBASE_SHIFT &
GDFIFOCFG_EPINFOBASE_MASK;
dwc2_writel(dfifocfg, hsotg->regs + GDFIFOCFG);
}
}
/**
* dwc2_calc_frame_interval() - Calculates the correct frame Interval value for
* the HFIR register according to PHY type and speed
*
* @hsotg: Programming view of DWC_otg controller
*
* NOTE: The caller can modify the value of the HFIR register only after the
* Port Enable bit of the Host Port Control and Status register (HPRT.EnaPort)
* has been set
*/
u32 dwc2_calc_frame_interval(struct dwc2_hsotg *hsotg)
{
u32 usbcfg;
u32 hprt0;
int clock = 60; /* default value */
usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
hprt0 = dwc2_readl(hsotg->regs + HPRT0);
if (!(usbcfg & GUSBCFG_PHYSEL) && (usbcfg & GUSBCFG_ULPI_UTMI_SEL) &&
!(usbcfg & GUSBCFG_PHYIF16))
clock = 60;
if ((usbcfg & GUSBCFG_PHYSEL) && hsotg->hw_params.fs_phy_type ==
GHWCFG2_FS_PHY_TYPE_SHARED_ULPI)
clock = 48;
if (!(usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) &&
!(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && (usbcfg & GUSBCFG_PHYIF16))
clock = 30;
if (!(usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) &&
!(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && !(usbcfg & GUSBCFG_PHYIF16))
clock = 60;
if ((usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) &&
!(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && (usbcfg & GUSBCFG_PHYIF16))
clock = 48;
if ((usbcfg & GUSBCFG_PHYSEL) && !(usbcfg & GUSBCFG_PHYIF16) &&
hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_SHARED_UTMI)
clock = 48;
if ((usbcfg & GUSBCFG_PHYSEL) &&
hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED)
clock = 48;
if ((hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT == HPRT0_SPD_HIGH_SPEED)
/* High speed case */
return 125 * clock - 1;
/* FS/LS case */
return 1000 * clock - 1;
}
/**
* dwc2_read_packet() - Reads a packet from the Rx FIFO into the destination
* buffer
*
* @hsotg: Programming view of DWC_otg controller
* @dest: Destination buffer for the packet
* @bytes: Number of bytes to copy to the destination
*/
void dwc2_read_packet(struct dwc2_hsotg *hsotg, u8 *dest, u16 bytes)
{
u32 __iomem *fifo = hsotg->regs + HCFIFO(0);
u32 *data_buf = (u32 *)dest;
int word_count = (bytes + 3) / 4;
int i;
/*
* Todo: Account for the case where dest is not dword aligned. This
* requires reading data from the FIFO into a u32 temp buffer, then
* moving it into the data buffer.
*/
dev_vdbg(hsotg->dev, "%s(%p,%p,%d)\n", __func__, hsotg, dest, bytes);
for (i = 0; i < word_count; i++, data_buf++)
*data_buf = dwc2_readl(fifo);
}
/**
* dwc2_dump_channel_info() - Prints the state of a host channel
*
* @hsotg: Programming view of DWC_otg controller
* @chan: Pointer to the channel to dump
*
* Must be called with interrupt disabled and spinlock held
*
* NOTE: This function will be removed once the peripheral controller code
* is integrated and the driver is stable
*/
static void dwc2_dump_channel_info(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan)
{
#ifdef VERBOSE_DEBUG
int num_channels = hsotg->params.host_channels;
struct dwc2_qh *qh;
u32 hcchar;
u32 hcsplt;
u32 hctsiz;
u32 hc_dma;
int i;
if (!chan)
return;
hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
hcsplt = dwc2_readl(hsotg->regs + HCSPLT(chan->hc_num));
hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chan->hc_num));
hc_dma = dwc2_readl(hsotg->regs + HCDMA(chan->hc_num));
dev_dbg(hsotg->dev, " Assigned to channel %p:\n", chan);
dev_dbg(hsotg->dev, " hcchar 0x%08x, hcsplt 0x%08x\n",
hcchar, hcsplt);
dev_dbg(hsotg->dev, " hctsiz 0x%08x, hc_dma 0x%08x\n",
hctsiz, hc_dma);
dev_dbg(hsotg->dev, " dev_addr: %d, ep_num: %d, ep_is_in: %d\n",
chan->dev_addr, chan->ep_num, chan->ep_is_in);
dev_dbg(hsotg->dev, " ep_type: %d\n", chan->ep_type);
dev_dbg(hsotg->dev, " max_packet: %d\n", chan->max_packet);
dev_dbg(hsotg->dev, " data_pid_start: %d\n", chan->data_pid_start);
dev_dbg(hsotg->dev, " xfer_started: %d\n", chan->xfer_started);
dev_dbg(hsotg->dev, " halt_status: %d\n", chan->halt_status);
dev_dbg(hsotg->dev, " xfer_buf: %p\n", chan->xfer_buf);
dev_dbg(hsotg->dev, " xfer_dma: %08lx\n",
(unsigned long)chan->xfer_dma);
dev_dbg(hsotg->dev, " xfer_len: %d\n", chan->xfer_len);
dev_dbg(hsotg->dev, " qh: %p\n", chan->qh);
dev_dbg(hsotg->dev, " NP inactive sched:\n");
list_for_each_entry(qh, &hsotg->non_periodic_sched_inactive,
qh_list_entry)
dev_dbg(hsotg->dev, " %p\n", qh);
dev_dbg(hsotg->dev, " NP waiting sched:\n");
list_for_each_entry(qh, &hsotg->non_periodic_sched_waiting,
qh_list_entry)
dev_dbg(hsotg->dev, " %p\n", qh);
dev_dbg(hsotg->dev, " NP active sched:\n");
list_for_each_entry(qh, &hsotg->non_periodic_sched_active,
qh_list_entry)
dev_dbg(hsotg->dev, " %p\n", qh);
dev_dbg(hsotg->dev, " Channels:\n");
for (i = 0; i < num_channels; i++) {
struct dwc2_host_chan *chan = hsotg->hc_ptr_array[i];
dev_dbg(hsotg->dev, " %2d: %p\n", i, chan);
}
#endif /* VERBOSE_DEBUG */
}
static int _dwc2_hcd_start(struct usb_hcd *hcd);
static void dwc2_host_start(struct dwc2_hsotg *hsotg)
{
struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);
hcd->self.is_b_host = dwc2_hcd_is_b_host(hsotg);
_dwc2_hcd_start(hcd);
}
static void dwc2_host_disconnect(struct dwc2_hsotg *hsotg)
{
struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);
hcd->self.is_b_host = 0;
}
static void dwc2_host_hub_info(struct dwc2_hsotg *hsotg, void *context,
int *hub_addr, int *hub_port)
{
struct urb *urb = context;
if (urb->dev->tt)
*hub_addr = urb->dev->tt->hub->devnum;
else
*hub_addr = 0;
*hub_port = urb->dev->ttport;
}
/*
* =========================================================================
* Low Level Host Channel Access Functions
* =========================================================================
*/
static void dwc2_hc_enable_slave_ints(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan)
{
u32 hcintmsk = HCINTMSK_CHHLTD;
switch (chan->ep_type) {
case USB_ENDPOINT_XFER_CONTROL:
case USB_ENDPOINT_XFER_BULK:
dev_vdbg(hsotg->dev, "control/bulk\n");
hcintmsk |= HCINTMSK_XFERCOMPL;
hcintmsk |= HCINTMSK_STALL;
hcintmsk |= HCINTMSK_XACTERR;
hcintmsk |= HCINTMSK_DATATGLERR;
if (chan->ep_is_in) {
hcintmsk |= HCINTMSK_BBLERR;
} else {
hcintmsk |= HCINTMSK_NAK;
hcintmsk |= HCINTMSK_NYET;
if (chan->do_ping)
hcintmsk |= HCINTMSK_ACK;
}
if (chan->do_split) {
hcintmsk |= HCINTMSK_NAK;
if (chan->complete_split)
hcintmsk |= HCINTMSK_NYET;
else
hcintmsk |= HCINTMSK_ACK;
}
if (chan->error_state)
hcintmsk |= HCINTMSK_ACK;
break;
case USB_ENDPOINT_XFER_INT:
if (dbg_perio())
dev_vdbg(hsotg->dev, "intr\n");
hcintmsk |= HCINTMSK_XFERCOMPL;
hcintmsk |= HCINTMSK_NAK;
hcintmsk |= HCINTMSK_STALL;
hcintmsk |= HCINTMSK_XACTERR;
hcintmsk |= HCINTMSK_DATATGLERR;
hcintmsk |= HCINTMSK_FRMOVRUN;
if (chan->ep_is_in)
hcintmsk |= HCINTMSK_BBLERR;
if (chan->error_state)
hcintmsk |= HCINTMSK_ACK;
if (chan->do_split) {
if (chan->complete_split)
hcintmsk |= HCINTMSK_NYET;
else
hcintmsk |= HCINTMSK_ACK;
}
break;
case USB_ENDPOINT_XFER_ISOC:
if (dbg_perio())
dev_vdbg(hsotg->dev, "isoc\n");
hcintmsk |= HCINTMSK_XFERCOMPL;
hcintmsk |= HCINTMSK_FRMOVRUN;
hcintmsk |= HCINTMSK_ACK;
if (chan->ep_is_in) {
hcintmsk |= HCINTMSK_XACTERR;
hcintmsk |= HCINTMSK_BBLERR;
}
break;
default:
dev_err(hsotg->dev, "## Unknown EP type ##\n");
break;
}
dwc2_writel(hcintmsk, hsotg->regs + HCINTMSK(chan->hc_num));
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "set HCINTMSK to %08x\n", hcintmsk);
}
static void dwc2_hc_enable_dma_ints(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan)
{
u32 hcintmsk = HCINTMSK_CHHLTD;
/*
* For Descriptor DMA mode core halts the channel on AHB error.
* Interrupt is not required.
*/
if (!hsotg->params.dma_desc_enable) {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "desc DMA disabled\n");
hcintmsk |= HCINTMSK_AHBERR;
} else {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "desc DMA enabled\n");
if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
hcintmsk |= HCINTMSK_XFERCOMPL;
}
if (chan->error_state && !chan->do_split &&
chan->ep_type != USB_ENDPOINT_XFER_ISOC) {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "setting ACK\n");
hcintmsk |= HCINTMSK_ACK;
if (chan->ep_is_in) {
hcintmsk |= HCINTMSK_DATATGLERR;
if (chan->ep_type != USB_ENDPOINT_XFER_INT)
hcintmsk |= HCINTMSK_NAK;
}
}
dwc2_writel(hcintmsk, hsotg->regs + HCINTMSK(chan->hc_num));
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "set HCINTMSK to %08x\n", hcintmsk);
}
static void dwc2_hc_enable_ints(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan)
{
u32 intmsk;
if (hsotg->params.host_dma) {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "DMA enabled\n");
dwc2_hc_enable_dma_ints(hsotg, chan);
} else {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "DMA disabled\n");
dwc2_hc_enable_slave_ints(hsotg, chan);
}
/* Enable the top level host channel interrupt */
intmsk = dwc2_readl(hsotg->regs + HAINTMSK);
intmsk |= 1 << chan->hc_num;
dwc2_writel(intmsk, hsotg->regs + HAINTMSK);
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "set HAINTMSK to %08x\n", intmsk);
/* Make sure host channel interrupts are enabled */
intmsk = dwc2_readl(hsotg->regs + GINTMSK);
intmsk |= GINTSTS_HCHINT;
dwc2_writel(intmsk, hsotg->regs + GINTMSK);
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "set GINTMSK to %08x\n", intmsk);
}
/**
* dwc2_hc_init() - Prepares a host channel for transferring packets to/from
* a specific endpoint
*
* @hsotg: Programming view of DWC_otg controller
* @chan: Information needed to initialize the host channel
*
* The HCCHARn register is set up with the characteristics specified in chan.
* Host channel interrupts that may need to be serviced while this transfer is
* in progress are enabled.
*/
static void dwc2_hc_init(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{
u8 hc_num = chan->hc_num;
u32 hcintmsk;
u32 hcchar;
u32 hcsplt = 0;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s()\n", __func__);
/* Clear old interrupt conditions for this host channel */
hcintmsk = 0xffffffff;
hcintmsk &= ~HCINTMSK_RESERVED14_31;
dwc2_writel(hcintmsk, hsotg->regs + HCINT(hc_num));
/* Enable channel interrupts required for this transfer */
dwc2_hc_enable_ints(hsotg, chan);
/*
* Program the HCCHARn register with the endpoint characteristics for
* the current transfer
*/
hcchar = chan->dev_addr << HCCHAR_DEVADDR_SHIFT & HCCHAR_DEVADDR_MASK;
hcchar |= chan->ep_num << HCCHAR_EPNUM_SHIFT & HCCHAR_EPNUM_MASK;
if (chan->ep_is_in)
hcchar |= HCCHAR_EPDIR;
if (chan->speed == USB_SPEED_LOW)
hcchar |= HCCHAR_LSPDDEV;
hcchar |= chan->ep_type << HCCHAR_EPTYPE_SHIFT & HCCHAR_EPTYPE_MASK;
hcchar |= chan->max_packet << HCCHAR_MPS_SHIFT & HCCHAR_MPS_MASK;
dwc2_writel(hcchar, hsotg->regs + HCCHAR(hc_num));
if (dbg_hc(chan)) {
dev_vdbg(hsotg->dev, "set HCCHAR(%d) to %08x\n",
hc_num, hcchar);
dev_vdbg(hsotg->dev, "%s: Channel %d\n",
__func__, hc_num);
dev_vdbg(hsotg->dev, " Dev Addr: %d\n",
chan->dev_addr);
dev_vdbg(hsotg->dev, " Ep Num: %d\n",
chan->ep_num);
dev_vdbg(hsotg->dev, " Is In: %d\n",
chan->ep_is_in);
dev_vdbg(hsotg->dev, " Is Low Speed: %d\n",
chan->speed == USB_SPEED_LOW);
dev_vdbg(hsotg->dev, " Ep Type: %d\n",
chan->ep_type);
dev_vdbg(hsotg->dev, " Max Pkt: %d\n",
chan->max_packet);
}
/* Program the HCSPLT register for SPLITs */
if (chan->do_split) {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev,
"Programming HC %d with split --> %s\n",
hc_num,
chan->complete_split ? "CSPLIT" : "SSPLIT");
if (chan->complete_split)
hcsplt |= HCSPLT_COMPSPLT;
hcsplt |= chan->xact_pos << HCSPLT_XACTPOS_SHIFT &
HCSPLT_XACTPOS_MASK;
hcsplt |= chan->hub_addr << HCSPLT_HUBADDR_SHIFT &
HCSPLT_HUBADDR_MASK;
hcsplt |= chan->hub_port << HCSPLT_PRTADDR_SHIFT &
HCSPLT_PRTADDR_MASK;
if (dbg_hc(chan)) {
dev_vdbg(hsotg->dev, " comp split %d\n",
chan->complete_split);
dev_vdbg(hsotg->dev, " xact pos %d\n",
chan->xact_pos);
dev_vdbg(hsotg->dev, " hub addr %d\n",
chan->hub_addr);
dev_vdbg(hsotg->dev, " hub port %d\n",
chan->hub_port);
dev_vdbg(hsotg->dev, " is_in %d\n",
chan->ep_is_in);
dev_vdbg(hsotg->dev, " Max Pkt %d\n",
chan->max_packet);
dev_vdbg(hsotg->dev, " xferlen %d\n",
chan->xfer_len);
}
}
dwc2_writel(hcsplt, hsotg->regs + HCSPLT(hc_num));
}
/**
* dwc2_hc_halt() - Attempts to halt a host channel
*
* @hsotg: Controller register interface
* @chan: Host channel to halt
* @halt_status: Reason for halting the channel
*
* This function should only be called in Slave mode or to abort a transfer in
* either Slave mode or DMA mode. Under normal circumstances in DMA mode, the
* controller halts the channel when the transfer is complete or a condition
* occurs that requires application intervention.
*
* In slave mode, checks for a free request queue entry, then sets the Channel
* Enable and Channel Disable bits of the Host Channel Characteristics
* register of the specified channel to intiate the halt. If there is no free
* request queue entry, sets only the Channel Disable bit of the HCCHARn
* register to flush requests for this channel. In the latter case, sets a
* flag to indicate that the host channel needs to be halted when a request
* queue slot is open.
*
* In DMA mode, always sets the Channel Enable and Channel Disable bits of the
* HCCHARn register. The controller ensures there is space in the request
* queue before submitting the halt request.
*
* Some time may elapse before the core flushes any posted requests for this
* host channel and halts. The Channel Halted interrupt handler completes the
* deactivation of the host channel.
*/
void dwc2_hc_halt(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan,
enum dwc2_halt_status halt_status)
{
u32 nptxsts, hptxsts, hcchar;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s()\n", __func__);
/*
* In buffer DMA or external DMA mode channel can't be halted
* for non-split periodic channels. At the end of the next
* uframe/frame (in the worst case), the core generates a channel
* halted and disables the channel automatically.
*/
if ((hsotg->params.g_dma && !hsotg->params.g_dma_desc) ||
hsotg->hw_params.arch == GHWCFG2_EXT_DMA_ARCH) {
if (!chan->do_split &&
(chan->ep_type == USB_ENDPOINT_XFER_ISOC ||
chan->ep_type == USB_ENDPOINT_XFER_INT)) {
dev_err(hsotg->dev, "%s() Channel can't be halted\n",
__func__);
return;
}
}
if (halt_status == DWC2_HC_XFER_NO_HALT_STATUS)
dev_err(hsotg->dev, "!!! halt_status = %d !!!\n", halt_status);
if (halt_status == DWC2_HC_XFER_URB_DEQUEUE ||
halt_status == DWC2_HC_XFER_AHB_ERR) {
/*
* Disable all channel interrupts except Ch Halted. The QTD
* and QH state associated with this transfer has been cleared
* (in the case of URB_DEQUEUE), so the channel needs to be
* shut down carefully to prevent crashes.
*/
u32 hcintmsk = HCINTMSK_CHHLTD;
dev_vdbg(hsotg->dev, "dequeue/error\n");
dwc2_writel(hcintmsk, hsotg->regs + HCINTMSK(chan->hc_num));
/*
* Make sure no other interrupts besides halt are currently
* pending. Handling another interrupt could cause a crash due
* to the QTD and QH state.
*/
dwc2_writel(~hcintmsk, hsotg->regs + HCINT(chan->hc_num));
/*
* Make sure the halt status is set to URB_DEQUEUE or AHB_ERR
* even if the channel was already halted for some other
* reason
*/
chan->halt_status = halt_status;
hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
if (!(hcchar & HCCHAR_CHENA)) {
/*
* The channel is either already halted or it hasn't
* started yet. In DMA mode, the transfer may halt if
* it finishes normally or a condition occurs that
* requires driver intervention. Don't want to halt
* the channel again. In either Slave or DMA mode,
* it's possible that the transfer has been assigned
* to a channel, but not started yet when an URB is
* dequeued. Don't want to halt a channel that hasn't
* started yet.
*/
return;
}
}
if (chan->halt_pending) {
/*
* A halt has already been issued for this channel. This might
* happen when a transfer is aborted by a higher level in
* the stack.
*/
dev_vdbg(hsotg->dev,
"*** %s: Channel %d, chan->halt_pending already set ***\n",
__func__, chan->hc_num);
return;
}
hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
/* No need to set the bit in DDMA for disabling the channel */
/* TODO check it everywhere channel is disabled */
if (!hsotg->params.dma_desc_enable) {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "desc DMA disabled\n");
hcchar |= HCCHAR_CHENA;
} else {
if (dbg_hc(chan))
dev_dbg(hsotg->dev, "desc DMA enabled\n");
}
hcchar |= HCCHAR_CHDIS;
if (!hsotg->params.host_dma) {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "DMA not enabled\n");
hcchar |= HCCHAR_CHENA;
/* Check for space in the request queue to issue the halt */
if (chan->ep_type == USB_ENDPOINT_XFER_CONTROL ||
chan->ep_type == USB_ENDPOINT_XFER_BULK) {
dev_vdbg(hsotg->dev, "control/bulk\n");
nptxsts = dwc2_readl(hsotg->regs + GNPTXSTS);
if ((nptxsts & TXSTS_QSPCAVAIL_MASK) == 0) {
dev_vdbg(hsotg->dev, "Disabling channel\n");
hcchar &= ~HCCHAR_CHENA;
}
} else {
if (dbg_perio())
dev_vdbg(hsotg->dev, "isoc/intr\n");
hptxsts = dwc2_readl(hsotg->regs + HPTXSTS);
if ((hptxsts & TXSTS_QSPCAVAIL_MASK) == 0 ||
hsotg->queuing_high_bandwidth) {
if (dbg_perio())
dev_vdbg(hsotg->dev, "Disabling channel\n");
hcchar &= ~HCCHAR_CHENA;
}
}
} else {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "DMA enabled\n");
}
dwc2_writel(hcchar, hsotg->regs + HCCHAR(chan->hc_num));
chan->halt_status = halt_status;
if (hcchar & HCCHAR_CHENA) {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "Channel enabled\n");
chan->halt_pending = 1;
chan->halt_on_queue = 0;
} else {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "Channel disabled\n");
chan->halt_on_queue = 1;
}
if (dbg_hc(chan)) {
dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
chan->hc_num);
dev_vdbg(hsotg->dev, " hcchar: 0x%08x\n",
hcchar);
dev_vdbg(hsotg->dev, " halt_pending: %d\n",
chan->halt_pending);
dev_vdbg(hsotg->dev, " halt_on_queue: %d\n",
chan->halt_on_queue);
dev_vdbg(hsotg->dev, " halt_status: %d\n",
chan->halt_status);
}
}
/**
* dwc2_hc_cleanup() - Clears the transfer state for a host channel
*
* @hsotg: Programming view of DWC_otg controller
* @chan: Identifies the host channel to clean up
*
* This function is normally called after a transfer is done and the host
* channel is being released
*/
void dwc2_hc_cleanup(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{
u32 hcintmsk;
chan->xfer_started = 0;
list_del_init(&chan->split_order_list_entry);
/*
* Clear channel interrupt enables and any unhandled channel interrupt
* conditions
*/
dwc2_writel(0, hsotg->regs + HCINTMSK(chan->hc_num));
hcintmsk = 0xffffffff;
hcintmsk &= ~HCINTMSK_RESERVED14_31;
dwc2_writel(hcintmsk, hsotg->regs + HCINT(chan->hc_num));
}
/**
* dwc2_hc_set_even_odd_frame() - Sets the channel property that indicates in
* which frame a periodic transfer should occur
*
* @hsotg: Programming view of DWC_otg controller
* @chan: Identifies the host channel to set up and its properties
* @hcchar: Current value of the HCCHAR register for the specified host channel
*
* This function has no effect on non-periodic transfers
*/
static void dwc2_hc_set_even_odd_frame(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan, u32 *hcchar)
{
if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
int host_speed;
int xfer_ns;
int xfer_us;
int bytes_in_fifo;
u16 fifo_space;
u16 frame_number;
u16 wire_frame;
/*
* Try to figure out if we're an even or odd frame. If we set
* even and the current frame number is even the the transfer
* will happen immediately. Similar if both are odd. If one is
* even and the other is odd then the transfer will happen when
* the frame number ticks.
*
* There's a bit of a balancing act to get this right.
* Sometimes we may want to send data in the current frame (AK
* right away). We might want to do this if the frame number
* _just_ ticked, but we might also want to do this in order
* to continue a split transaction that happened late in a
* microframe (so we didn't know to queue the next transfer
* until the frame number had ticked). The problem is that we
* need a lot of knowledge to know if there's actually still
* time to send things or if it would be better to wait until
* the next frame.
*
* We can look at how much time is left in the current frame
* and make a guess about whether we'll have time to transfer.
* We'll do that.
*/
/* Get speed host is running at */
host_speed = (chan->speed != USB_SPEED_HIGH &&
!chan->do_split) ? chan->speed : USB_SPEED_HIGH;
/* See how many bytes are in the periodic FIFO right now */
fifo_space = (dwc2_readl(hsotg->regs + HPTXSTS) &
TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT;
bytes_in_fifo = sizeof(u32) *
(hsotg->params.host_perio_tx_fifo_size -
fifo_space);
/*
* Roughly estimate bus time for everything in the periodic
* queue + our new transfer. This is "rough" because we're
* using a function that makes takes into account IN/OUT
* and INT/ISO and we're just slamming in one value for all
* transfers. This should be an over-estimate and that should
* be OK, but we can probably tighten it.
*/
xfer_ns = usb_calc_bus_time(host_speed, false, false,
chan->xfer_len + bytes_in_fifo);
xfer_us = NS_TO_US(xfer_ns);
/* See what frame number we'll be at by the time we finish */
frame_number = dwc2_hcd_get_future_frame_number(hsotg, xfer_us);
/* This is when we were scheduled to be on the wire */
wire_frame = dwc2_frame_num_inc(chan->qh->next_active_frame, 1);
/*
* If we'd finish _after_ the frame we're scheduled in then
* it's hopeless. Just schedule right away and hope for the
* best. Note that it _might_ be wise to call back into the
* scheduler to pick a better frame, but this is better than
* nothing.
*/
if (dwc2_frame_num_gt(frame_number, wire_frame)) {
dwc2_sch_vdbg(hsotg,
"QH=%p EO MISS fr=%04x=>%04x (%+d)\n",
chan->qh, wire_frame, frame_number,
dwc2_frame_num_dec(frame_number,
wire_frame));
wire_frame = frame_number;
/*
* We picked a different frame number; communicate this
* back to the scheduler so it doesn't try to schedule
* another in the same frame.
*
* Remember that next_active_frame is 1 before the wire
* frame.
*/
chan->qh->next_active_frame =
dwc2_frame_num_dec(frame_number, 1);
}
if (wire_frame & 1)
*hcchar |= HCCHAR_ODDFRM;
else
*hcchar &= ~HCCHAR_ODDFRM;
}
}
static void dwc2_set_pid_isoc(struct dwc2_host_chan *chan)
{
/* Set up the initial PID for the transfer */
if (chan->speed == USB_SPEED_HIGH) {
if (chan->ep_is_in) {
if (chan->multi_count == 1)
chan->data_pid_start = DWC2_HC_PID_DATA0;
else if (chan->multi_count == 2)
chan->data_pid_start = DWC2_HC_PID_DATA1;
else
chan->data_pid_start = DWC2_HC_PID_DATA2;
} else {
if (chan->multi_count == 1)
chan->data_pid_start = DWC2_HC_PID_DATA0;
else
chan->data_pid_start = DWC2_HC_PID_MDATA;
}
} else {
chan->data_pid_start = DWC2_HC_PID_DATA0;
}
}
/**
* dwc2_hc_write_packet() - Writes a packet into the Tx FIFO associated with
* the Host Channel
*
* @hsotg: Programming view of DWC_otg controller
* @chan: Information needed to initialize the host channel
*
* This function should only be called in Slave mode. For a channel associated
* with a non-periodic EP, the non-periodic Tx FIFO is written. For a channel
* associated with a periodic EP, the periodic Tx FIFO is written.
*
* Upon return the xfer_buf and xfer_count fields in chan are incremented by
* the number of bytes written to the Tx FIFO.
*/
static void dwc2_hc_write_packet(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan)
{
u32 i;
u32 remaining_count;
u32 byte_count;
u32 dword_count;
u32 __iomem *data_fifo;
u32 *data_buf = (u32 *)chan->xfer_buf;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s()\n", __func__);
data_fifo = (u32 __iomem *)(hsotg->regs + HCFIFO(chan->hc_num));
remaining_count = chan->xfer_len - chan->xfer_count;
if (remaining_count > chan->max_packet)
byte_count = chan->max_packet;
else
byte_count = remaining_count;
dword_count = (byte_count + 3) / 4;
if (((unsigned long)data_buf & 0x3) == 0) {
/* xfer_buf is DWORD aligned */
for (i = 0; i < dword_count; i++, data_buf++)
dwc2_writel(*data_buf, data_fifo);
} else {
/* xfer_buf is not DWORD aligned */
for (i = 0; i < dword_count; i++, data_buf++) {
u32 data = data_buf[0] | data_buf[1] << 8 |
data_buf[2] << 16 | data_buf[3] << 24;
dwc2_writel(data, data_fifo);
}
}
chan->xfer_count += byte_count;
chan->xfer_buf += byte_count;
}
/**
* dwc2_hc_do_ping() - Starts a PING transfer
*
* @hsotg: Programming view of DWC_otg controller
* @chan: Information needed to initialize the host channel
*
* This function should only be called in Slave mode. The Do Ping bit is set in
* the HCTSIZ register, then the channel is enabled.
*/
static void dwc2_hc_do_ping(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan)
{
u32 hcchar;
u32 hctsiz;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
chan->hc_num);
hctsiz = TSIZ_DOPNG;
hctsiz |= 1 << TSIZ_PKTCNT_SHIFT;
dwc2_writel(hctsiz, hsotg->regs + HCTSIZ(chan->hc_num));
hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
hcchar |= HCCHAR_CHENA;
hcchar &= ~HCCHAR_CHDIS;
dwc2_writel(hcchar, hsotg->regs + HCCHAR(chan->hc_num));
}
/**
* dwc2_hc_start_transfer() - Does the setup for a data transfer for a host
* channel and starts the transfer
*
* @hsotg: Programming view of DWC_otg controller
* @chan: Information needed to initialize the host channel. The xfer_len value
* may be reduced to accommodate the max widths of the XferSize and
* PktCnt fields in the HCTSIZn register. The multi_count value may be
* changed to reflect the final xfer_len value.
*
* This function may be called in either Slave mode or DMA mode. In Slave mode,
* the caller must ensure that there is sufficient space in the request queue
* and Tx Data FIFO.
*
* For an OUT transfer in Slave mode, it loads a data packet into the
* appropriate FIFO. If necessary, additional data packets are loaded in the
* Host ISR.
*
* For an IN transfer in Slave mode, a data packet is requested. The data
* packets are unloaded from the Rx FIFO in the Host ISR. If necessary,
* additional data packets are requested in the Host ISR.
*
* For a PING transfer in Slave mode, the Do Ping bit is set in the HCTSIZ
* register along with a packet count of 1 and the channel is enabled. This
* causes a single PING transaction to occur. Other fields in HCTSIZ are
* simply set to 0 since no data transfer occurs in this case.
*
* For a PING transfer in DMA mode, the HCTSIZ register is initialized with
* all the information required to perform the subsequent data transfer. In
* addition, the Do Ping bit is set in the HCTSIZ register. In this case, the
* controller performs the entire PING protocol, then starts the data
* transfer.
*/
static void dwc2_hc_start_transfer(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan)
{
u32 max_hc_xfer_size = hsotg->params.max_transfer_size;
u16 max_hc_pkt_count = hsotg->params.max_packet_count;
u32 hcchar;
u32 hctsiz = 0;
u16 num_packets;
u32 ec_mc;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s()\n", __func__);
if (chan->do_ping) {
if (!hsotg->params.host_dma) {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "ping, no DMA\n");
dwc2_hc_do_ping(hsotg, chan);
chan->xfer_started = 1;
return;
}
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "ping, DMA\n");
hctsiz |= TSIZ_DOPNG;
}
if (chan->do_split) {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "split\n");
num_packets = 1;
if (chan->complete_split && !chan->ep_is_in)
/*
* For CSPLIT OUT Transfer, set the size to 0 so the
* core doesn't expect any data written to the FIFO
*/
chan->xfer_len = 0;
else if (chan->ep_is_in || chan->xfer_len > chan->max_packet)
chan->xfer_len = chan->max_packet;
else if (!chan->ep_is_in && chan->xfer_len > 188)
chan->xfer_len = 188;
hctsiz |= chan->xfer_len << TSIZ_XFERSIZE_SHIFT &
TSIZ_XFERSIZE_MASK;
/* For split set ec_mc for immediate retries */
if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC)
ec_mc = 3;
else
ec_mc = 1;
} else {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "no split\n");
/*
* Ensure that the transfer length and packet count will fit
* in the widths allocated for them in the HCTSIZn register
*/
if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
/*
* Make sure the transfer size is no larger than one
* (micro)frame's worth of data. (A check was done
* when the periodic transfer was accepted to ensure
* that a (micro)frame's worth of data can be
* programmed into a channel.)
*/
u32 max_periodic_len =
chan->multi_count * chan->max_packet;
if (chan->xfer_len > max_periodic_len)
chan->xfer_len = max_periodic_len;
} else if (chan->xfer_len > max_hc_xfer_size) {
/*
* Make sure that xfer_len is a multiple of max packet
* size
*/
chan->xfer_len =
max_hc_xfer_size - chan->max_packet + 1;
}
if (chan->xfer_len > 0) {
num_packets = (chan->xfer_len + chan->max_packet - 1) /
chan->max_packet;
if (num_packets > max_hc_pkt_count) {
num_packets = max_hc_pkt_count;
chan->xfer_len = num_packets * chan->max_packet;
}
} else {
/* Need 1 packet for transfer length of 0 */
num_packets = 1;
}
if (chan->ep_is_in)
/*
* Always program an integral # of max packets for IN
* transfers
*/
chan->xfer_len = num_packets * chan->max_packet;
if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC)
/*
* Make sure that the multi_count field matches the
* actual transfer length
*/
chan->multi_count = num_packets;
if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
dwc2_set_pid_isoc(chan);
hctsiz |= chan->xfer_len << TSIZ_XFERSIZE_SHIFT &
TSIZ_XFERSIZE_MASK;
/* The ec_mc gets the multi_count for non-split */
ec_mc = chan->multi_count;
}
chan->start_pkt_count = num_packets;
hctsiz |= num_packets << TSIZ_PKTCNT_SHIFT & TSIZ_PKTCNT_MASK;
hctsiz |= chan->data_pid_start << TSIZ_SC_MC_PID_SHIFT &
TSIZ_SC_MC_PID_MASK;
dwc2_writel(hctsiz, hsotg->regs + HCTSIZ(chan->hc_num));
if (dbg_hc(chan)) {
dev_vdbg(hsotg->dev, "Wrote %08x to HCTSIZ(%d)\n",
hctsiz, chan->hc_num);
dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
chan->hc_num);
dev_vdbg(hsotg->dev, " Xfer Size: %d\n",
(hctsiz & TSIZ_XFERSIZE_MASK) >>
TSIZ_XFERSIZE_SHIFT);
dev_vdbg(hsotg->dev, " Num Pkts: %d\n",
(hctsiz & TSIZ_PKTCNT_MASK) >>
TSIZ_PKTCNT_SHIFT);
dev_vdbg(hsotg->dev, " Start PID: %d\n",
(hctsiz & TSIZ_SC_MC_PID_MASK) >>
TSIZ_SC_MC_PID_SHIFT);
}
if (hsotg->params.host_dma) {
dma_addr_t dma_addr;
if (chan->align_buf) {
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "align_buf\n");
dma_addr = chan->align_buf;
} else {
dma_addr = chan->xfer_dma;
}
dwc2_writel((u32)dma_addr, hsotg->regs + HCDMA(chan->hc_num));
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "Wrote %08lx to HCDMA(%d)\n",
(unsigned long)dma_addr, chan->hc_num);
}
/* Start the split */
if (chan->do_split) {
u32 hcsplt = dwc2_readl(hsotg->regs + HCSPLT(chan->hc_num));
hcsplt |= HCSPLT_SPLTENA;
dwc2_writel(hcsplt, hsotg->regs + HCSPLT(chan->hc_num));
}
hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
hcchar &= ~HCCHAR_MULTICNT_MASK;
hcchar |= (ec_mc << HCCHAR_MULTICNT_SHIFT) & HCCHAR_MULTICNT_MASK;
dwc2_hc_set_even_odd_frame(hsotg, chan, &hcchar);
if (hcchar & HCCHAR_CHDIS)
dev_warn(hsotg->dev,
"%s: chdis set, channel %d, hcchar 0x%08x\n",
__func__, chan->hc_num, hcchar);
/* Set host channel enable after all other setup is complete */
hcchar |= HCCHAR_CHENA;
hcchar &= ~HCCHAR_CHDIS;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, " Multi Cnt: %d\n",
(hcchar & HCCHAR_MULTICNT_MASK) >>
HCCHAR_MULTICNT_SHIFT);
dwc2_writel(hcchar, hsotg->regs + HCCHAR(chan->hc_num));
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "Wrote %08x to HCCHAR(%d)\n", hcchar,
chan->hc_num);
chan->xfer_started = 1;
chan->requests++;
if (!hsotg->params.host_dma &&
!chan->ep_is_in && chan->xfer_len > 0)
/* Load OUT packet into the appropriate Tx FIFO */
dwc2_hc_write_packet(hsotg, chan);
}
/**
* dwc2_hc_start_transfer_ddma() - Does the setup for a data transfer for a
* host channel and starts the transfer in Descriptor DMA mode
*
* @hsotg: Programming view of DWC_otg controller
* @chan: Information needed to initialize the host channel
*
* Initializes HCTSIZ register. For a PING transfer the Do Ping bit is set.
* Sets PID and NTD values. For periodic transfers initializes SCHED_INFO field
* with micro-frame bitmap.
*
* Initializes HCDMA register with descriptor list address and CTD value then
* starts the transfer via enabling the channel.
*/
void dwc2_hc_start_transfer_ddma(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan)
{
u32 hcchar;
u32 hctsiz = 0;
if (chan->do_ping)
hctsiz |= TSIZ_DOPNG;
if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
dwc2_set_pid_isoc(chan);
/* Packet Count and Xfer Size are not used in Descriptor DMA mode */
hctsiz |= chan->data_pid_start << TSIZ_SC_MC_PID_SHIFT &
TSIZ_SC_MC_PID_MASK;
/* 0 - 1 descriptor, 1 - 2 descriptors, etc */
hctsiz |= (chan->ntd - 1) << TSIZ_NTD_SHIFT & TSIZ_NTD_MASK;
/* Non-zero only for high-speed interrupt endpoints */
hctsiz |= chan->schinfo << TSIZ_SCHINFO_SHIFT & TSIZ_SCHINFO_MASK;
if (dbg_hc(chan)) {
dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
chan->hc_num);
dev_vdbg(hsotg->dev, " Start PID: %d\n",
chan->data_pid_start);
dev_vdbg(hsotg->dev, " NTD: %d\n", chan->ntd - 1);
}
dwc2_writel(hctsiz, hsotg->regs + HCTSIZ(chan->hc_num));
dma_sync_single_for_device(hsotg->dev, chan->desc_list_addr,
chan->desc_list_sz, DMA_TO_DEVICE);
dwc2_writel(chan->desc_list_addr, hsotg->regs + HCDMA(chan->hc_num));
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "Wrote %pad to HCDMA(%d)\n",
&chan->desc_list_addr, chan->hc_num);
hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
hcchar &= ~HCCHAR_MULTICNT_MASK;
hcchar |= chan->multi_count << HCCHAR_MULTICNT_SHIFT &
HCCHAR_MULTICNT_MASK;
if (hcchar & HCCHAR_CHDIS)
dev_warn(hsotg->dev,
"%s: chdis set, channel %d, hcchar 0x%08x\n",
__func__, chan->hc_num, hcchar);
/* Set host channel enable after all other setup is complete */
hcchar |= HCCHAR_CHENA;
hcchar &= ~HCCHAR_CHDIS;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, " Multi Cnt: %d\n",
(hcchar & HCCHAR_MULTICNT_MASK) >>
HCCHAR_MULTICNT_SHIFT);
dwc2_writel(hcchar, hsotg->regs + HCCHAR(chan->hc_num));
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "Wrote %08x to HCCHAR(%d)\n", hcchar,
chan->hc_num);
chan->xfer_started = 1;
chan->requests++;
}
/**
* dwc2_hc_continue_transfer() - Continues a data transfer that was started by
* a previous call to dwc2_hc_start_transfer()
*
* @hsotg: Programming view of DWC_otg controller
* @chan: Information needed to initialize the host channel
*
* The caller must ensure there is sufficient space in the request queue and Tx
* Data FIFO. This function should only be called in Slave mode. In DMA mode,
* the controller acts autonomously to complete transfers programmed to a host
* channel.
*
* For an OUT transfer, a new data packet is loaded into the appropriate FIFO
* if there is any data remaining to be queued. For an IN transfer, another
* data packet is always requested. For the SETUP phase of a control transfer,
* this function does nothing.
*
* Return: 1 if a new request is queued, 0 if no more requests are required
* for this transfer
*/
static int dwc2_hc_continue_transfer(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan)
{
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
chan->hc_num);
if (chan->do_split)
/* SPLITs always queue just once per channel */
return 0;
if (chan->data_pid_start == DWC2_HC_PID_SETUP)
/* SETUPs are queued only once since they can't be NAK'd */
return 0;
if (chan->ep_is_in) {
/*
* Always queue another request for other IN transfers. If
* back-to-back INs are issued and NAKs are received for both,
* the driver may still be processing the first NAK when the
* second NAK is received. When the interrupt handler clears
* the NAK interrupt for the first NAK, the second NAK will
* not be seen. So we can't depend on the NAK interrupt
* handler to requeue a NAK'd request. Instead, IN requests
* are issued each time this function is called. When the
* transfer completes, the extra requests for the channel will
* be flushed.
*/
u32 hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
dwc2_hc_set_even_odd_frame(hsotg, chan, &hcchar);
hcchar |= HCCHAR_CHENA;
hcchar &= ~HCCHAR_CHDIS;
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, " IN xfer: hcchar = 0x%08x\n",
hcchar);
dwc2_writel(hcchar, hsotg->regs + HCCHAR(chan->hc_num));
chan->requests++;
return 1;
}
/* OUT transfers */
if (chan->xfer_count < chan->xfer_len) {
if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
u32 hcchar = dwc2_readl(hsotg->regs +
HCCHAR(chan->hc_num));
dwc2_hc_set_even_odd_frame(hsotg, chan,
&hcchar);
}
/* Load OUT packet into the appropriate Tx FIFO */
dwc2_hc_write_packet(hsotg, chan);
chan->requests++;
return 1;
}
return 0;
}
/*
* =========================================================================
* HCD
* =========================================================================
*/
/*
* Processes all the URBs in a single list of QHs. Completes them with
* -ETIMEDOUT and frees the QTD.
*
* Must be called with interrupt disabled and spinlock held
*/
static void dwc2_kill_urbs_in_qh_list(struct dwc2_hsotg *hsotg,
struct list_head *qh_list)
{
struct dwc2_qh *qh, *qh_tmp;
struct dwc2_qtd *qtd, *qtd_tmp;
list_for_each_entry_safe(qh, qh_tmp, qh_list, qh_list_entry) {
list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
qtd_list_entry) {
dwc2_host_complete(hsotg, qtd, -ECONNRESET);
dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
}
}
}
static void dwc2_qh_list_free(struct dwc2_hsotg *hsotg,
struct list_head *qh_list)
{
struct dwc2_qtd *qtd, *qtd_tmp;
struct dwc2_qh *qh, *qh_tmp;
unsigned long flags;
if (!qh_list->next)
/* The list hasn't been initialized yet */
return;
spin_lock_irqsave(&hsotg->lock, flags);
/* Ensure there are no QTDs or URBs left */
dwc2_kill_urbs_in_qh_list(hsotg, qh_list);
list_for_each_entry_safe(qh, qh_tmp, qh_list, qh_list_entry) {
dwc2_hcd_qh_unlink(hsotg, qh);
/* Free each QTD in the QH's QTD list */
list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
qtd_list_entry)
dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
if (qh->channel && qh->channel->qh == qh)
qh->channel->qh = NULL;
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_hcd_qh_free(hsotg, qh);
spin_lock_irqsave(&hsotg->lock, flags);
}
spin_unlock_irqrestore(&hsotg->lock, flags);
}
/*
* Responds with an error status of -ETIMEDOUT to all URBs in the non-periodic
* and periodic schedules. The QTD associated with each URB is removed from
* the schedule and freed. This function may be called when a disconnect is
* detected or when the HCD is being stopped.
*
* Must be called with interrupt disabled and spinlock held
*/
static void dwc2_kill_all_urbs(struct dwc2_hsotg *hsotg)
{
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_inactive);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_waiting);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_active);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_inactive);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_ready);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_assigned);
dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_queued);
}
/**
* dwc2_hcd_start() - Starts the HCD when switching to Host mode
*
* @hsotg: Pointer to struct dwc2_hsotg
*/
void dwc2_hcd_start(struct dwc2_hsotg *hsotg)
{
u32 hprt0;
if (hsotg->op_state == OTG_STATE_B_HOST) {
/*
* Reset the port. During a HNP mode switch the reset
* needs to occur within 1ms and have a duration of at
* least 50ms.
*/
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 |= HPRT0_RST;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
}
queue_delayed_work(hsotg->wq_otg, &hsotg->start_work,
msecs_to_jiffies(50));
}
/* Must be called with interrupt disabled and spinlock held */
static void dwc2_hcd_cleanup_channels(struct dwc2_hsotg *hsotg)
{
int num_channels = hsotg->params.host_channels;
struct dwc2_host_chan *channel;
u32 hcchar;
int i;
if (!hsotg->params.host_dma) {
/* Flush out any channel requests in slave mode */
for (i = 0; i < num_channels; i++) {
channel = hsotg->hc_ptr_array[i];
if (!list_empty(&channel->hc_list_entry))
continue;
hcchar = dwc2_readl(hsotg->regs + HCCHAR(i));
if (hcchar & HCCHAR_CHENA) {
hcchar &= ~(HCCHAR_CHENA | HCCHAR_EPDIR);
hcchar |= HCCHAR_CHDIS;
dwc2_writel(hcchar, hsotg->regs + HCCHAR(i));
}
}
}
for (i = 0; i < num_channels; i++) {
channel = hsotg->hc_ptr_array[i];
if (!list_empty(&channel->hc_list_entry))
continue;
hcchar = dwc2_readl(hsotg->regs + HCCHAR(i));
if (hcchar & HCCHAR_CHENA) {
/* Halt the channel */
hcchar |= HCCHAR_CHDIS;
dwc2_writel(hcchar, hsotg->regs + HCCHAR(i));
}
dwc2_hc_cleanup(hsotg, channel);
list_add_tail(&channel->hc_list_entry, &hsotg->free_hc_list);
/*
* Added for Descriptor DMA to prevent channel double cleanup in
* release_channel_ddma(), which is called from ep_disable when
* device disconnects
*/
channel->qh = NULL;
}
/* All channels have been freed, mark them available */
if (hsotg->params.uframe_sched) {
hsotg->available_host_channels =
hsotg->params.host_channels;
} else {
hsotg->non_periodic_channels = 0;
hsotg->periodic_channels = 0;
}
}
/**
* dwc2_hcd_connect() - Handles connect of the HCD
*
* @hsotg: Pointer to struct dwc2_hsotg
*
* Must be called with interrupt disabled and spinlock held
*/
void dwc2_hcd_connect(struct dwc2_hsotg *hsotg)
{
if (hsotg->lx_state != DWC2_L0)
usb_hcd_resume_root_hub(hsotg->priv);
hsotg->flags.b.port_connect_status_change = 1;
hsotg->flags.b.port_connect_status = 1;
}
/**
* dwc2_hcd_disconnect() - Handles disconnect of the HCD
*
* @hsotg: Pointer to struct dwc2_hsotg
* @force: If true, we won't try to reconnect even if we see device connected.
*
* Must be called with interrupt disabled and spinlock held
*/
void dwc2_hcd_disconnect(struct dwc2_hsotg *hsotg, bool force)
{
u32 intr;
u32 hprt0;
/* Set status flags for the hub driver */
hsotg->flags.b.port_connect_status_change = 1;
hsotg->flags.b.port_connect_status = 0;
/*
* Shutdown any transfers in process by clearing the Tx FIFO Empty
* interrupt mask and status bits and disabling subsequent host
* channel interrupts.
*/
intr = dwc2_readl(hsotg->regs + GINTMSK);
intr &= ~(GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT);
dwc2_writel(intr, hsotg->regs + GINTMSK);
intr = GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT;
dwc2_writel(intr, hsotg->regs + GINTSTS);
/*
* Turn off the vbus power only if the core has transitioned to device
* mode. If still in host mode, need to keep power on to detect a
* reconnection.
*/
if (dwc2_is_device_mode(hsotg)) {
if (hsotg->op_state != OTG_STATE_A_SUSPEND) {
dev_dbg(hsotg->dev, "Disconnect: PortPower off\n");
dwc2_writel(0, hsotg->regs + HPRT0);
}
dwc2_disable_host_interrupts(hsotg);
}
/* Respond with an error status to all URBs in the schedule */
dwc2_kill_all_urbs(hsotg);
if (dwc2_is_host_mode(hsotg))
/* Clean up any host channels that were in use */
dwc2_hcd_cleanup_channels(hsotg);
dwc2_host_disconnect(hsotg);
/*
* Add an extra check here to see if we're actually connected but
* we don't have a detection interrupt pending. This can happen if:
* 1. hardware sees connect
* 2. hardware sees disconnect
* 3. hardware sees connect
* 4. dwc2_port_intr() - clears connect interrupt
* 5. dwc2_handle_common_intr() - calls here
*
* Without the extra check here we will end calling disconnect
* and won't get any future interrupts to handle the connect.
*/
if (!force) {
hprt0 = dwc2_readl(hsotg->regs + HPRT0);
if (!(hprt0 & HPRT0_CONNDET) && (hprt0 & HPRT0_CONNSTS))
dwc2_hcd_connect(hsotg);
}
}
/**
* dwc2_hcd_rem_wakeup() - Handles Remote Wakeup
*
* @hsotg: Pointer to struct dwc2_hsotg
*/
static void dwc2_hcd_rem_wakeup(struct dwc2_hsotg *hsotg)
{
if (hsotg->bus_suspended) {
hsotg->flags.b.port_suspend_change = 1;
usb_hcd_resume_root_hub(hsotg->priv);
}
if (hsotg->lx_state == DWC2_L1)
hsotg->flags.b.port_l1_change = 1;
}
/**
* dwc2_hcd_stop() - Halts the DWC_otg host mode operations in a clean manner
*
* @hsotg: Pointer to struct dwc2_hsotg
*
* Must be called with interrupt disabled and spinlock held
*/
void dwc2_hcd_stop(struct dwc2_hsotg *hsotg)
{
dev_dbg(hsotg->dev, "DWC OTG HCD STOP\n");
/*
* The root hub should be disconnected before this function is called.
* The disconnect will clear the QTD lists (via ..._hcd_urb_dequeue)
* and the QH lists (via ..._hcd_endpoint_disable).
*/
/* Turn off all host-specific interrupts */
dwc2_disable_host_interrupts(hsotg);
/* Turn off the vbus power */
dev_dbg(hsotg->dev, "PortPower off\n");
dwc2_writel(0, hsotg->regs + HPRT0);
}
/* Caller must hold driver lock */
static int dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg,
struct dwc2_hcd_urb *urb, struct dwc2_qh *qh,
struct dwc2_qtd *qtd)
{
u32 intr_mask;
int retval;
int dev_speed;
if (!hsotg->flags.b.port_connect_status) {
/* No longer connected */
dev_err(hsotg->dev, "Not connected\n");
return -ENODEV;
}
dev_speed = dwc2_host_get_speed(hsotg, urb->priv);
/* Some configurations cannot support LS traffic on a FS root port */
if ((dev_speed == USB_SPEED_LOW) &&
(hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED) &&
(hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_UTMI)) {
u32 hprt0 = dwc2_readl(hsotg->regs + HPRT0);
u32 prtspd = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;
if (prtspd == HPRT0_SPD_FULL_SPEED)
return -ENODEV;
}
if (!qtd)
return -EINVAL;
dwc2_hcd_qtd_init(qtd, urb);
retval = dwc2_hcd_qtd_add(hsotg, qtd, qh);
if (retval) {
dev_err(hsotg->dev,
"DWC OTG HCD URB Enqueue failed adding QTD. Error status %d\n",
retval);
return retval;
}
intr_mask = dwc2_readl(hsotg->regs + GINTMSK);
if (!(intr_mask & GINTSTS_SOF)) {
enum dwc2_transaction_type tr_type;
if (qtd->qh->ep_type == USB_ENDPOINT_XFER_BULK &&
!(qtd->urb->flags & URB_GIVEBACK_ASAP))
/*
* Do not schedule SG transactions until qtd has
* URB_GIVEBACK_ASAP set
*/
return 0;
tr_type = dwc2_hcd_select_transactions(hsotg);
if (tr_type != DWC2_TRANSACTION_NONE)
dwc2_hcd_queue_transactions(hsotg, tr_type);
}
return 0;
}
/* Must be called with interrupt disabled and spinlock held */
static int dwc2_hcd_urb_dequeue(struct dwc2_hsotg *hsotg,
struct dwc2_hcd_urb *urb)
{
struct dwc2_qh *qh;
struct dwc2_qtd *urb_qtd;
urb_qtd = urb->qtd;
if (!urb_qtd) {
dev_dbg(hsotg->dev, "## Urb QTD is NULL ##\n");
return -EINVAL;
}
qh = urb_qtd->qh;
if (!qh) {
dev_dbg(hsotg->dev, "## Urb QTD QH is NULL ##\n");
return -EINVAL;
}
urb->priv = NULL;
if (urb_qtd->in_process && qh->channel) {
dwc2_dump_channel_info(hsotg, qh->channel);
/* The QTD is in process (it has been assigned to a channel) */
if (hsotg->flags.b.port_connect_status)
/*
* If still connected (i.e. in host mode), halt the
* channel so it can be used for other transfers. If
* no longer connected, the host registers can't be
* written to halt the channel since the core is in
* device mode.
*/
dwc2_hc_halt(hsotg, qh->channel,
DWC2_HC_XFER_URB_DEQUEUE);
}
/*
* Free the QTD and clean up the associated QH. Leave the QH in the
* schedule if it has any remaining QTDs.
*/
if (!hsotg->params.dma_desc_enable) {
u8 in_process = urb_qtd->in_process;
dwc2_hcd_qtd_unlink_and_free(hsotg, urb_qtd, qh);
if (in_process) {
dwc2_hcd_qh_deactivate(hsotg, qh, 0);
qh->channel = NULL;
} else if (list_empty(&qh->qtd_list)) {
dwc2_hcd_qh_unlink(hsotg, qh);
}
} else {
dwc2_hcd_qtd_unlink_and_free(hsotg, urb_qtd, qh);
}
return 0;
}
/* Must NOT be called with interrupt disabled or spinlock held */
static int dwc2_hcd_endpoint_disable(struct dwc2_hsotg *hsotg,
struct usb_host_endpoint *ep, int retry)
{
struct dwc2_qtd *qtd, *qtd_tmp;
struct dwc2_qh *qh;
unsigned long flags;
int rc;
spin_lock_irqsave(&hsotg->lock, flags);
qh = ep->hcpriv;
if (!qh) {
rc = -EINVAL;
goto err;
}
while (!list_empty(&qh->qtd_list) && retry--) {
if (retry == 0) {
dev_err(hsotg->dev,
"## timeout in dwc2_hcd_endpoint_disable() ##\n");
rc = -EBUSY;
goto err;
}
spin_unlock_irqrestore(&hsotg->lock, flags);
msleep(20);
spin_lock_irqsave(&hsotg->lock, flags);
qh = ep->hcpriv;
if (!qh) {
rc = -EINVAL;
goto err;
}
}
dwc2_hcd_qh_unlink(hsotg, qh);
/* Free each QTD in the QH's QTD list */
list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list, qtd_list_entry)
dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
ep->hcpriv = NULL;
if (qh->channel && qh->channel->qh == qh)
qh->channel->qh = NULL;
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_hcd_qh_free(hsotg, qh);
return 0;
err:
ep->hcpriv = NULL;
spin_unlock_irqrestore(&hsotg->lock, flags);
return rc;
}
/* Must be called with interrupt disabled and spinlock held */
static int dwc2_hcd_endpoint_reset(struct dwc2_hsotg *hsotg,
struct usb_host_endpoint *ep)
{
struct dwc2_qh *qh = ep->hcpriv;
if (!qh)
return -EINVAL;
qh->data_toggle = DWC2_HC_PID_DATA0;
return 0;
}
/**
* dwc2_core_init() - Initializes the DWC_otg controller registers and
* prepares the core for device mode or host mode operation
*
* @hsotg: Programming view of the DWC_otg controller
* @initial_setup: If true then this is the first init for this instance.
*/
int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup)
{
u32 usbcfg, otgctl;
int retval;
dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);
usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
/* Set ULPI External VBUS bit if needed */
usbcfg &= ~GUSBCFG_ULPI_EXT_VBUS_DRV;
if (hsotg->params.phy_ulpi_ext_vbus)
usbcfg |= GUSBCFG_ULPI_EXT_VBUS_DRV;
/* Set external TS Dline pulsing bit if needed */
usbcfg &= ~GUSBCFG_TERMSELDLPULSE;
if (hsotg->params.ts_dline)
usbcfg |= GUSBCFG_TERMSELDLPULSE;
dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
/*
* Reset the Controller
*
* We only need to reset the controller if this is a re-init.
* For the first init we know for sure that earlier code reset us (it
* needed to in order to properly detect various parameters).
*/
if (!initial_setup) {
retval = dwc2_core_reset(hsotg, false);
if (retval) {
dev_err(hsotg->dev, "%s(): Reset failed, aborting\n",
__func__);
return retval;
}
}
/*
* This needs to happen in FS mode before any other programming occurs
*/
retval = dwc2_phy_init(hsotg, initial_setup);
if (retval)
return retval;
/* Program the GAHBCFG Register */
retval = dwc2_gahbcfg_init(hsotg);
if (retval)
return retval;
/* Program the GUSBCFG register */
dwc2_gusbcfg_init(hsotg);
/* Program the GOTGCTL register */
otgctl = dwc2_readl(hsotg->regs + GOTGCTL);
otgctl &= ~GOTGCTL_OTGVER;
dwc2_writel(otgctl, hsotg->regs + GOTGCTL);
/* Clear the SRP success bit for FS-I2c */
hsotg->srp_success = 0;
/* Enable common interrupts */
dwc2_enable_common_interrupts(hsotg);
/*
* Do device or host initialization based on mode during PCD and
* HCD initialization
*/
if (dwc2_is_host_mode(hsotg)) {
dev_dbg(hsotg->dev, "Host Mode\n");
hsotg->op_state = OTG_STATE_A_HOST;
} else {
dev_dbg(hsotg->dev, "Device Mode\n");
hsotg->op_state = OTG_STATE_B_PERIPHERAL;
}
return 0;
}
/**
* dwc2_core_host_init() - Initializes the DWC_otg controller registers for
* Host mode
*
* @hsotg: Programming view of DWC_otg controller
*
* This function flushes the Tx and Rx FIFOs and flushes any entries in the
* request queues. Host channels are reset to ensure that they are ready for
* performing transfers.
*/
static void dwc2_core_host_init(struct dwc2_hsotg *hsotg)
{
u32 hcfg, hfir, otgctl, usbcfg;
dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);
/* Set HS/FS Timeout Calibration to 7 (max available value).
* The number of PHY clocks that the application programs in
* this field is added to the high/full speed interpacket timeout
* duration in the core to account for any additional delays
* introduced by the PHY. This can be required, because the delay
* introduced by the PHY in generating the linestate condition
* can vary from one PHY to another.
*/
usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
usbcfg |= GUSBCFG_TOUTCAL(7);
dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
/* Restart the Phy Clock */
dwc2_writel(0, hsotg->regs + PCGCTL);
/* Initialize Host Configuration Register */
dwc2_init_fs_ls_pclk_sel(hsotg);
if (hsotg->params.speed == DWC2_SPEED_PARAM_FULL ||
hsotg->params.speed == DWC2_SPEED_PARAM_LOW) {
hcfg = dwc2_readl(hsotg->regs + HCFG);
hcfg |= HCFG_FSLSSUPP;
dwc2_writel(hcfg, hsotg->regs + HCFG);
}
/*
* This bit allows dynamic reloading of the HFIR register during
* runtime. This bit needs to be programmed during initial configuration
* and its value must not be changed during runtime.
*/
if (hsotg->params.reload_ctl) {
hfir = dwc2_readl(hsotg->regs + HFIR);
hfir |= HFIR_RLDCTRL;
dwc2_writel(hfir, hsotg->regs + HFIR);
}
if (hsotg->params.dma_desc_enable) {
u32 op_mode = hsotg->hw_params.op_mode;
if (hsotg->hw_params.snpsid < DWC2_CORE_REV_2_90a ||
!hsotg->hw_params.dma_desc_enable ||
op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE ||
op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE ||
op_mode == GHWCFG2_OP_MODE_UNDEFINED) {
dev_err(hsotg->dev,
"Hardware does not support descriptor DMA mode -\n");
dev_err(hsotg->dev,
"falling back to buffer DMA mode.\n");
hsotg->params.dma_desc_enable = false;
} else {
hcfg = dwc2_readl(hsotg->regs + HCFG);
hcfg |= HCFG_DESCDMA;
dwc2_writel(hcfg, hsotg->regs + HCFG);
}
}
/* Configure data FIFO sizes */
dwc2_config_fifos(hsotg);
/* TODO - check this */
/* Clear Host Set HNP Enable in the OTG Control Register */
otgctl = dwc2_readl(hsotg->regs + GOTGCTL);
otgctl &= ~GOTGCTL_HSTSETHNPEN;
dwc2_writel(otgctl, hsotg->regs + GOTGCTL);
/* Make sure the FIFOs are flushed */
dwc2_flush_tx_fifo(hsotg, 0x10 /* all TX FIFOs */);
dwc2_flush_rx_fifo(hsotg);
/* Clear Host Set HNP Enable in the OTG Control Register */
otgctl = dwc2_readl(hsotg->regs + GOTGCTL);
otgctl &= ~GOTGCTL_HSTSETHNPEN;
dwc2_writel(otgctl, hsotg->regs + GOTGCTL);
if (!hsotg->params.dma_desc_enable) {
int num_channels, i;
u32 hcchar;
/* Flush out any leftover queued requests */
num_channels = hsotg->params.host_channels;
for (i = 0; i < num_channels; i++) {
hcchar = dwc2_readl(hsotg->regs + HCCHAR(i));
hcchar &= ~HCCHAR_CHENA;
hcchar |= HCCHAR_CHDIS;
hcchar &= ~HCCHAR_EPDIR;
dwc2_writel(hcchar, hsotg->regs + HCCHAR(i));
}
/* Halt all channels to put them into a known state */
for (i = 0; i < num_channels; i++) {
hcchar = dwc2_readl(hsotg->regs + HCCHAR(i));
hcchar |= HCCHAR_CHENA | HCCHAR_CHDIS;
hcchar &= ~HCCHAR_EPDIR;
dwc2_writel(hcchar, hsotg->regs + HCCHAR(i));
dev_dbg(hsotg->dev, "%s: Halt channel %d\n",
__func__, i);
if (dwc2_hsotg_wait_bit_clear(hsotg, HCCHAR(i),
HCCHAR_CHENA, 1000)) {
dev_warn(hsotg->dev, "Unable to clear enable on channel %d\n",
i);
}
}
}
/* Enable ACG feature in host mode, if supported */
dwc2_enable_acg(hsotg);
/* Turn on the vbus power */
dev_dbg(hsotg->dev, "Init: Port Power? op_state=%d\n", hsotg->op_state);
if (hsotg->op_state == OTG_STATE_A_HOST) {
u32 hprt0 = dwc2_read_hprt0(hsotg);
dev_dbg(hsotg->dev, "Init: Power Port (%d)\n",
!!(hprt0 & HPRT0_PWR));
if (!(hprt0 & HPRT0_PWR)) {
hprt0 |= HPRT0_PWR;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
}
}
dwc2_enable_host_interrupts(hsotg);
}
/*
* Initializes dynamic portions of the DWC_otg HCD state
*
* Must be called with interrupt disabled and spinlock held
*/
static void dwc2_hcd_reinit(struct dwc2_hsotg *hsotg)
{
struct dwc2_host_chan *chan, *chan_tmp;
int num_channels;
int i;
hsotg->flags.d32 = 0;
hsotg->non_periodic_qh_ptr = &hsotg->non_periodic_sched_active;
if (hsotg->params.uframe_sched) {
hsotg->available_host_channels =
hsotg->params.host_channels;
} else {
hsotg->non_periodic_channels = 0;
hsotg->periodic_channels = 0;
}
/*
* Put all channels in the free channel list and clean up channel
* states
*/
list_for_each_entry_safe(chan, chan_tmp, &hsotg->free_hc_list,
hc_list_entry)
list_del_init(&chan->hc_list_entry);
num_channels = hsotg->params.host_channels;
for (i = 0; i < num_channels; i++) {
chan = hsotg->hc_ptr_array[i];
list_add_tail(&chan->hc_list_entry, &hsotg->free_hc_list);
dwc2_hc_cleanup(hsotg, chan);
}
/* Initialize the DWC core for host mode operation */
dwc2_core_host_init(hsotg);
}
static void dwc2_hc_init_split(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan,
struct dwc2_qtd *qtd, struct dwc2_hcd_urb *urb)
{
int hub_addr, hub_port;
chan->do_split = 1;
chan->xact_pos = qtd->isoc_split_pos;
chan->complete_split = qtd->complete_split;
dwc2_host_hub_info(hsotg, urb->priv, &hub_addr, &hub_port);
chan->hub_addr = (u8)hub_addr;
chan->hub_port = (u8)hub_port;
}
static void dwc2_hc_init_xfer(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan,
struct dwc2_qtd *qtd)
{
struct dwc2_hcd_urb *urb = qtd->urb;
struct dwc2_hcd_iso_packet_desc *frame_desc;
switch (dwc2_hcd_get_pipe_type(&urb->pipe_info)) {
case USB_ENDPOINT_XFER_CONTROL:
chan->ep_type = USB_ENDPOINT_XFER_CONTROL;
switch (qtd->control_phase) {
case DWC2_CONTROL_SETUP:
dev_vdbg(hsotg->dev, " Control setup transaction\n");
chan->do_ping = 0;
chan->ep_is_in = 0;
chan->data_pid_start = DWC2_HC_PID_SETUP;
if (hsotg->params.host_dma)
chan->xfer_dma = urb->setup_dma;
else
chan->xfer_buf = urb->setup_packet;
chan->xfer_len = 8;
break;
case DWC2_CONTROL_DATA:
dev_vdbg(hsotg->dev, " Control data transaction\n");
chan->data_pid_start = qtd->data_toggle;
break;
case DWC2_CONTROL_STATUS:
/*
* Direction is opposite of data direction or IN if no
* data
*/
dev_vdbg(hsotg->dev, " Control status transaction\n");
if (urb->length == 0)
chan->ep_is_in = 1;
else
chan->ep_is_in =
dwc2_hcd_is_pipe_out(&urb->pipe_info);
if (chan->ep_is_in)
chan->do_ping = 0;
chan->data_pid_start = DWC2_HC_PID_DATA1;
chan->xfer_len = 0;
if (hsotg->params.host_dma)
chan->xfer_dma = hsotg->status_buf_dma;
else
chan->xfer_buf = hsotg->status_buf;
break;
}
break;
case USB_ENDPOINT_XFER_BULK:
chan->ep_type = USB_ENDPOINT_XFER_BULK;
break;
case USB_ENDPOINT_XFER_INT:
chan->ep_type = USB_ENDPOINT_XFER_INT;
break;
case USB_ENDPOINT_XFER_ISOC:
chan->ep_type = USB_ENDPOINT_XFER_ISOC;
if (hsotg->params.dma_desc_enable)
break;
frame_desc = &urb->iso_descs[qtd->isoc_frame_index];
frame_desc->status = 0;
if (hsotg->params.host_dma) {
chan->xfer_dma = urb->dma;
chan->xfer_dma += frame_desc->offset +
qtd->isoc_split_offset;
} else {
chan->xfer_buf = urb->buf;
chan->xfer_buf += frame_desc->offset +
qtd->isoc_split_offset;
}
chan->xfer_len = frame_desc->length - qtd->isoc_split_offset;
if (chan->xact_pos == DWC2_HCSPLT_XACTPOS_ALL) {
if (chan->xfer_len <= 188)
chan->xact_pos = DWC2_HCSPLT_XACTPOS_ALL;
else
chan->xact_pos = DWC2_HCSPLT_XACTPOS_BEGIN;
}
break;
}
}
static int dwc2_alloc_split_dma_aligned_buf(struct dwc2_hsotg *hsotg,
struct dwc2_qh *qh,
struct dwc2_host_chan *chan)
{
if (!hsotg->unaligned_cache ||
chan->max_packet > DWC2_KMEM_UNALIGNED_BUF_SIZE)
return -ENOMEM;
if (!qh->dw_align_buf) {
qh->dw_align_buf = kmem_cache_alloc(hsotg->unaligned_cache,
GFP_ATOMIC | GFP_DMA);
if (!qh->dw_align_buf)
return -ENOMEM;
}
qh->dw_align_buf_dma = dma_map_single(hsotg->dev, qh->dw_align_buf,
DWC2_KMEM_UNALIGNED_BUF_SIZE,
DMA_FROM_DEVICE);
if (dma_mapping_error(hsotg->dev, qh->dw_align_buf_dma)) {
dev_err(hsotg->dev, "can't map align_buf\n");
chan->align_buf = 0;
return -EINVAL;
}
chan->align_buf = qh->dw_align_buf_dma;
return 0;
}
#define DWC2_USB_DMA_ALIGN 4
struct dma_aligned_buffer {
void *kmalloc_ptr;
void *old_xfer_buffer;
u8 data[0];
};
static void dwc2_free_dma_aligned_buffer(struct urb *urb)
{
struct dma_aligned_buffer *temp;
if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
return;
temp = container_of(urb->transfer_buffer,
struct dma_aligned_buffer, data);
if (usb_urb_dir_in(urb))
memcpy(temp->old_xfer_buffer, temp->data,
urb->transfer_buffer_length);
urb->transfer_buffer = temp->old_xfer_buffer;
kfree(temp->kmalloc_ptr);
urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
}
static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
{
struct dma_aligned_buffer *temp, *kmalloc_ptr;
size_t kmalloc_size;
if (urb->num_sgs || urb->sg ||
urb->transfer_buffer_length == 0 ||
!((uintptr_t)urb->transfer_buffer & (DWC2_USB_DMA_ALIGN - 1)))
return 0;
/* Allocate a buffer with enough padding for alignment */
kmalloc_size = urb->transfer_buffer_length +
sizeof(struct dma_aligned_buffer) + DWC2_USB_DMA_ALIGN - 1;
kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
if (!kmalloc_ptr)
return -ENOMEM;
/* Position our struct dma_aligned_buffer such that data is aligned */
temp = PTR_ALIGN(kmalloc_ptr + 1, DWC2_USB_DMA_ALIGN) - 1;
temp->kmalloc_ptr = kmalloc_ptr;
temp->old_xfer_buffer = urb->transfer_buffer;
if (usb_urb_dir_out(urb))
memcpy(temp->data, urb->transfer_buffer,
urb->transfer_buffer_length);
urb->transfer_buffer = temp->data;
urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
return 0;
}
static int dwc2_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
gfp_t mem_flags)
{
int ret;
/* We assume setup_dma is always aligned; warn if not */
WARN_ON_ONCE(urb->setup_dma &&
(urb->setup_dma & (DWC2_USB_DMA_ALIGN - 1)));
ret = dwc2_alloc_dma_aligned_buffer(urb, mem_flags);
if (ret)
return ret;
ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
if (ret)
dwc2_free_dma_aligned_buffer(urb);
return ret;
}
static void dwc2_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
{
usb_hcd_unmap_urb_for_dma(hcd, urb);
dwc2_free_dma_aligned_buffer(urb);
}
/**
* dwc2_assign_and_init_hc() - Assigns transactions from a QTD to a free host
* channel and initializes the host channel to perform the transactions. The
* host channel is removed from the free list.
*
* @hsotg: The HCD state structure
* @qh: Transactions from the first QTD for this QH are selected and assigned
* to a free host channel
*/
static int dwc2_assign_and_init_hc(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
{
struct dwc2_host_chan *chan;
struct dwc2_hcd_urb *urb;
struct dwc2_qtd *qtd;
if (dbg_qh(qh))
dev_vdbg(hsotg->dev, "%s(%p,%p)\n", __func__, hsotg, qh);
if (list_empty(&qh->qtd_list)) {
dev_dbg(hsotg->dev, "No QTDs in QH list\n");
return -ENOMEM;
}
if (list_empty(&hsotg->free_hc_list)) {
dev_dbg(hsotg->dev, "No free channel to assign\n");
return -ENOMEM;
}
chan = list_first_entry(&hsotg->free_hc_list, struct dwc2_host_chan,
hc_list_entry);
/* Remove host channel from free list */
list_del_init(&chan->hc_list_entry);
qtd = list_first_entry(&qh->qtd_list, struct dwc2_qtd, qtd_list_entry);
urb = qtd->urb;
qh->channel = chan;
qtd->in_process = 1;
/*
* Use usb_pipedevice to determine device address. This address is
* 0 before the SET_ADDRESS command and the correct address afterward.
*/
chan->dev_addr = dwc2_hcd_get_dev_addr(&urb->pipe_info);
chan->ep_num = dwc2_hcd_get_ep_num(&urb->pipe_info);
chan->speed = qh->dev_speed;
chan->max_packet = dwc2_max_packet(qh->maxp);
chan->xfer_started = 0;
chan->halt_status = DWC2_HC_XFER_NO_HALT_STATUS;
chan->error_state = (qtd->error_count > 0);
chan->halt_on_queue = 0;
chan->halt_pending = 0;
chan->requests = 0;
/*
* The following values may be modified in the transfer type section
* below. The xfer_len value may be reduced when the transfer is
* started to accommodate the max widths of the XferSize and PktCnt
* fields in the HCTSIZn register.
*/
chan->ep_is_in = (dwc2_hcd_is_pipe_in(&urb->pipe_info) != 0);
if (chan->ep_is_in)
chan->do_ping = 0;
else
chan->do_ping = qh->ping_state;
chan->data_pid_start = qh->data_toggle;
chan->multi_count = 1;
if (urb->actual_length > urb->length &&
!dwc2_hcd_is_pipe_in(&urb->pipe_info))
urb->actual_length = urb->length;
if (hsotg->params.host_dma)
chan->xfer_dma = urb->dma + urb->actual_length;
else
chan->xfer_buf = (u8 *)urb->buf + urb->actual_length;
chan->xfer_len = urb->length - urb->actual_length;
chan->xfer_count = 0;
/* Set the split attributes if required */
if (qh->do_split)
dwc2_hc_init_split(hsotg, chan, qtd, urb);
else
chan->do_split = 0;
/* Set the transfer attributes */
dwc2_hc_init_xfer(hsotg, chan, qtd);
/* For non-dword aligned buffers */
if (hsotg->params.host_dma && qh->do_split &&
chan->ep_is_in && (chan->xfer_dma & 0x3)) {
dev_vdbg(hsotg->dev, "Non-aligned buffer\n");
if (dwc2_alloc_split_dma_aligned_buf(hsotg, qh, chan)) {
dev_err(hsotg->dev,
"Failed to allocate memory to handle non-aligned buffer\n");
/* Add channel back to free list */
chan->align_buf = 0;
chan->multi_count = 0;
list_add_tail(&chan->hc_list_entry,
&hsotg->free_hc_list);
qtd->in_process = 0;
qh->channel = NULL;
return -ENOMEM;
}
} else {
/*
* We assume that DMA is always aligned in non-split
* case or split out case. Warn if not.
*/
WARN_ON_ONCE(hsotg->params.host_dma &&
(chan->xfer_dma & 0x3));
chan->align_buf = 0;
}
if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC)
/*
* This value may be modified when the transfer is started
* to reflect the actual transfer length
*/
chan->multi_count = dwc2_hb_mult(qh->maxp);
if (hsotg->params.dma_desc_enable) {
chan->desc_list_addr = qh->desc_list_dma;
chan->desc_list_sz = qh->desc_list_sz;
}
dwc2_hc_init(hsotg, chan);
chan->qh = qh;
return 0;
}
/**
* dwc2_hcd_select_transactions() - Selects transactions from the HCD transfer
* schedule and assigns them to available host channels. Called from the HCD
* interrupt handler functions.
*
* @hsotg: The HCD state structure
*
* Return: The types of new transactions that were assigned to host channels
*/
enum dwc2_transaction_type dwc2_hcd_select_transactions(
struct dwc2_hsotg *hsotg)
{
enum dwc2_transaction_type ret_val = DWC2_TRANSACTION_NONE;
struct list_head *qh_ptr;
struct dwc2_qh *qh;
int num_channels;
#ifdef DWC2_DEBUG_SOF
dev_vdbg(hsotg->dev, " Select Transactions\n");
#endif
/* Process entries in the periodic ready list */
qh_ptr = hsotg->periodic_sched_ready.next;
while (qh_ptr != &hsotg->periodic_sched_ready) {
if (list_empty(&hsotg->free_hc_list))
break;
if (hsotg->params.uframe_sched) {
if (hsotg->available_host_channels <= 1)
break;
hsotg->available_host_channels--;
}
qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
if (dwc2_assign_and_init_hc(hsotg, qh))
break;
/*
* Move the QH from the periodic ready schedule to the
* periodic assigned schedule
*/
qh_ptr = qh_ptr->next;
list_move_tail(&qh->qh_list_entry,
&hsotg->periodic_sched_assigned);
ret_val = DWC2_TRANSACTION_PERIODIC;
}
/*
* Process entries in the inactive portion of the non-periodic
* schedule. Some free host channels may not be used if they are
* reserved for periodic transfers.
*/
num_channels = hsotg->params.host_channels;
qh_ptr = hsotg->non_periodic_sched_inactive.next;
while (qh_ptr != &hsotg->non_periodic_sched_inactive) {
if (!hsotg->params.uframe_sched &&
hsotg->non_periodic_channels >= num_channels -
hsotg->periodic_channels)
break;
if (list_empty(&hsotg->free_hc_list))
break;
qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
if (hsotg->params.uframe_sched) {
if (hsotg->available_host_channels < 1)
break;
hsotg->available_host_channels--;
}
if (dwc2_assign_and_init_hc(hsotg, qh))
break;
/*
* Move the QH from the non-periodic inactive schedule to the
* non-periodic active schedule
*/
qh_ptr = qh_ptr->next;
list_move_tail(&qh->qh_list_entry,
&hsotg->non_periodic_sched_active);
if (ret_val == DWC2_TRANSACTION_NONE)
ret_val = DWC2_TRANSACTION_NON_PERIODIC;
else
ret_val = DWC2_TRANSACTION_ALL;
if (!hsotg->params.uframe_sched)
hsotg->non_periodic_channels++;
}
return ret_val;
}
/**
* dwc2_queue_transaction() - Attempts to queue a single transaction request for
* a host channel associated with either a periodic or non-periodic transfer
*
* @hsotg: The HCD state structure
* @chan: Host channel descriptor associated with either a periodic or
* non-periodic transfer
* @fifo_dwords_avail: Number of DWORDs available in the periodic Tx FIFO
* for periodic transfers or the non-periodic Tx FIFO
* for non-periodic transfers
*
* Return: 1 if a request is queued and more requests may be needed to
* complete the transfer, 0 if no more requests are required for this
* transfer, -1 if there is insufficient space in the Tx FIFO
*
* This function assumes that there is space available in the appropriate
* request queue. For an OUT transfer or SETUP transaction in Slave mode,
* it checks whether space is available in the appropriate Tx FIFO.
*
* Must be called with interrupt disabled and spinlock held
*/
static int dwc2_queue_transaction(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan,
u16 fifo_dwords_avail)
{
int retval = 0;
if (chan->do_split)
/* Put ourselves on the list to keep order straight */
list_move_tail(&chan->split_order_list_entry,
&hsotg->split_order);
if (hsotg->params.host_dma) {
if (hsotg->params.dma_desc_enable) {
if (!chan->xfer_started ||
chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
dwc2_hcd_start_xfer_ddma(hsotg, chan->qh);
chan->qh->ping_state = 0;
}
} else if (!chan->xfer_started) {
dwc2_hc_start_transfer(hsotg, chan);
chan->qh->ping_state = 0;
}
} else if (chan->halt_pending) {
/* Don't queue a request if the channel has been halted */
} else if (chan->halt_on_queue) {
dwc2_hc_halt(hsotg, chan, chan->halt_status);
} else if (chan->do_ping) {
if (!chan->xfer_started)
dwc2_hc_start_transfer(hsotg, chan);
} else if (!chan->ep_is_in ||
chan->data_pid_start == DWC2_HC_PID_SETUP) {
if ((fifo_dwords_avail * 4) >= chan->max_packet) {
if (!chan->xfer_started) {
dwc2_hc_start_transfer(hsotg, chan);
retval = 1;
} else {
retval = dwc2_hc_continue_transfer(hsotg, chan);
}
} else {
retval = -1;
}
} else {
if (!chan->xfer_started) {
dwc2_hc_start_transfer(hsotg, chan);
retval = 1;
} else {
retval = dwc2_hc_continue_transfer(hsotg, chan);
}
}
return retval;
}
/*
* Processes periodic channels for the next frame and queues transactions for
* these channels to the DWC_otg controller. After queueing transactions, the
* Periodic Tx FIFO Empty interrupt is enabled if there are more transactions
* to queue as Periodic Tx FIFO or request queue space becomes available.
* Otherwise, the Periodic Tx FIFO Empty interrupt is disabled.
*
* Must be called with interrupt disabled and spinlock held
*/
static void dwc2_process_periodic_channels(struct dwc2_hsotg *hsotg)
{
struct list_head *qh_ptr;
struct dwc2_qh *qh;
u32 tx_status;
u32 fspcavail;
u32 gintmsk;
int status;
bool no_queue_space = false;
bool no_fifo_space = false;
u32 qspcavail;
/* If empty list then just adjust interrupt enables */
if (list_empty(&hsotg->periodic_sched_assigned))
goto exit;
if (dbg_perio())
dev_vdbg(hsotg->dev, "Queue periodic transactions\n");
tx_status = dwc2_readl(hsotg->regs + HPTXSTS);
qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
TXSTS_QSPCAVAIL_SHIFT;
fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
TXSTS_FSPCAVAIL_SHIFT;
if (dbg_perio()) {
dev_vdbg(hsotg->dev, " P Tx Req Queue Space Avail (before queue): %d\n",
qspcavail);
dev_vdbg(hsotg->dev, " P Tx FIFO Space Avail (before queue): %d\n",
fspcavail);
}
qh_ptr = hsotg->periodic_sched_assigned.next;
while (qh_ptr != &hsotg->periodic_sched_assigned) {
tx_status = dwc2_readl(hsotg->regs + HPTXSTS);
qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
TXSTS_QSPCAVAIL_SHIFT;
if (qspcavail == 0) {
no_queue_space = true;
break;
}
qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
if (!qh->channel) {
qh_ptr = qh_ptr->next;
continue;
}
/* Make sure EP's TT buffer is clean before queueing qtds */
if (qh->tt_buffer_dirty) {
qh_ptr = qh_ptr->next;
continue;
}
/*
* Set a flag if we're queuing high-bandwidth in slave mode.
* The flag prevents any halts to get into the request queue in
* the middle of multiple high-bandwidth packets getting queued.
*/
if (!hsotg->params.host_dma &&
qh->channel->multi_count > 1)
hsotg->queuing_high_bandwidth = 1;
fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
TXSTS_FSPCAVAIL_SHIFT;
status = dwc2_queue_transaction(hsotg, qh->channel, fspcavail);
if (status < 0) {
no_fifo_space = true;
break;
}
/*
* In Slave mode, stay on the current transfer until there is
* nothing more to do or the high-bandwidth request count is
* reached. In DMA mode, only need to queue one request. The
* controller automatically handles multiple packets for
* high-bandwidth transfers.
*/
if (hsotg->params.host_dma || status == 0 ||
qh->channel->requests == qh->channel->multi_count) {
qh_ptr = qh_ptr->next;
/*
* Move the QH from the periodic assigned schedule to
* the periodic queued schedule
*/
list_move_tail(&qh->qh_list_entry,
&hsotg->periodic_sched_queued);
/* done queuing high bandwidth */
hsotg->queuing_high_bandwidth = 0;
}
}
exit:
if (no_queue_space || no_fifo_space ||
(!hsotg->params.host_dma &&
!list_empty(&hsotg->periodic_sched_assigned))) {
/*
* May need to queue more transactions as the request
* queue or Tx FIFO empties. Enable the periodic Tx
* FIFO empty interrupt. (Always use the half-empty
* level to ensure that new requests are loaded as
* soon as possible.)
*/
gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
if (!(gintmsk & GINTSTS_PTXFEMP)) {
gintmsk |= GINTSTS_PTXFEMP;
dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
}
} else {
/*
* Disable the Tx FIFO empty interrupt since there are
* no more transactions that need to be queued right
* now. This function is called from interrupt
* handlers to queue more transactions as transfer
* states change.
*/
gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
if (gintmsk & GINTSTS_PTXFEMP) {
gintmsk &= ~GINTSTS_PTXFEMP;
dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
}
}
}
/*
* Processes active non-periodic channels and queues transactions for these
* channels to the DWC_otg controller. After queueing transactions, the NP Tx
* FIFO Empty interrupt is enabled if there are more transactions to queue as
* NP Tx FIFO or request queue space becomes available. Otherwise, the NP Tx
* FIFO Empty interrupt is disabled.
*
* Must be called with interrupt disabled and spinlock held
*/
static void dwc2_process_non_periodic_channels(struct dwc2_hsotg *hsotg)
{
struct list_head *orig_qh_ptr;
struct dwc2_qh *qh;
u32 tx_status;
u32 qspcavail;
u32 fspcavail;
u32 gintmsk;
int status;
int no_queue_space = 0;
int no_fifo_space = 0;
int more_to_do = 0;
dev_vdbg(hsotg->dev, "Queue non-periodic transactions\n");
tx_status = dwc2_readl(hsotg->regs + GNPTXSTS);
qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
TXSTS_QSPCAVAIL_SHIFT;
fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
TXSTS_FSPCAVAIL_SHIFT;
dev_vdbg(hsotg->dev, " NP Tx Req Queue Space Avail (before queue): %d\n",
qspcavail);
dev_vdbg(hsotg->dev, " NP Tx FIFO Space Avail (before queue): %d\n",
fspcavail);
/*
* Keep track of the starting point. Skip over the start-of-list
* entry.
*/
if (hsotg->non_periodic_qh_ptr == &hsotg->non_periodic_sched_active)
hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next;
orig_qh_ptr = hsotg->non_periodic_qh_ptr;
/*
* Process once through the active list or until no more space is
* available in the request queue or the Tx FIFO
*/
do {
tx_status = dwc2_readl(hsotg->regs + GNPTXSTS);
qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
TXSTS_QSPCAVAIL_SHIFT;
if (!hsotg->params.host_dma && qspcavail == 0) {
no_queue_space = 1;
break;
}
qh = list_entry(hsotg->non_periodic_qh_ptr, struct dwc2_qh,
qh_list_entry);
if (!qh->channel)
goto next;
/* Make sure EP's TT buffer is clean before queueing qtds */
if (qh->tt_buffer_dirty)
goto next;
fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
TXSTS_FSPCAVAIL_SHIFT;
status = dwc2_queue_transaction(hsotg, qh->channel, fspcavail);
if (status > 0) {
more_to_do = 1;
} else if (status < 0) {
no_fifo_space = 1;
break;
}
next:
/* Advance to next QH, skipping start-of-list entry */
hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next;
if (hsotg->non_periodic_qh_ptr ==
&hsotg->non_periodic_sched_active)
hsotg->non_periodic_qh_ptr =
hsotg->non_periodic_qh_ptr->next;
} while (hsotg->non_periodic_qh_ptr != orig_qh_ptr);
if (!hsotg->params.host_dma) {
tx_status = dwc2_readl(hsotg->regs + GNPTXSTS);
qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
TXSTS_QSPCAVAIL_SHIFT;
fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
TXSTS_FSPCAVAIL_SHIFT;
dev_vdbg(hsotg->dev,
" NP Tx Req Queue Space Avail (after queue): %d\n",
qspcavail);
dev_vdbg(hsotg->dev,
" NP Tx FIFO Space Avail (after queue): %d\n",
fspcavail);
if (more_to_do || no_queue_space || no_fifo_space) {
/*
* May need to queue more transactions as the request
* queue or Tx FIFO empties. Enable the non-periodic
* Tx FIFO empty interrupt. (Always use the half-empty
* level to ensure that new requests are loaded as
* soon as possible.)
*/
gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
gintmsk |= GINTSTS_NPTXFEMP;
dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
} else {
/*
* Disable the Tx FIFO empty interrupt since there are
* no more transactions that need to be queued right
* now. This function is called from interrupt
* handlers to queue more transactions as transfer
* states change.
*/
gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
gintmsk &= ~GINTSTS_NPTXFEMP;
dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
}
}
}
/**
* dwc2_hcd_queue_transactions() - Processes the currently active host channels
* and queues transactions for these channels to the DWC_otg controller. Called
* from the HCD interrupt handler functions.
*
* @hsotg: The HCD state structure
* @tr_type: The type(s) of transactions to queue (non-periodic, periodic,
* or both)
*
* Must be called with interrupt disabled and spinlock held
*/
void dwc2_hcd_queue_transactions(struct dwc2_hsotg *hsotg,
enum dwc2_transaction_type tr_type)
{
#ifdef DWC2_DEBUG_SOF
dev_vdbg(hsotg->dev, "Queue Transactions\n");
#endif
/* Process host channels associated with periodic transfers */
if (tr_type == DWC2_TRANSACTION_PERIODIC ||
tr_type == DWC2_TRANSACTION_ALL)
dwc2_process_periodic_channels(hsotg);
/* Process host channels associated with non-periodic transfers */
if (tr_type == DWC2_TRANSACTION_NON_PERIODIC ||
tr_type == DWC2_TRANSACTION_ALL) {
if (!list_empty(&hsotg->non_periodic_sched_active)) {
dwc2_process_non_periodic_channels(hsotg);
} else {
/*
* Ensure NP Tx FIFO empty interrupt is disabled when
* there are no non-periodic transfers to process
*/
u32 gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
gintmsk &= ~GINTSTS_NPTXFEMP;
dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
}
}
}
static void dwc2_conn_id_status_change(struct work_struct *work)
{
struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
wf_otg);
u32 count = 0;
u32 gotgctl;
unsigned long flags;
dev_dbg(hsotg->dev, "%s()\n", __func__);
gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
dev_dbg(hsotg->dev, "gotgctl=%0x\n", gotgctl);
dev_dbg(hsotg->dev, "gotgctl.b.conidsts=%d\n",
!!(gotgctl & GOTGCTL_CONID_B));
/* B-Device connector (Device Mode) */
if (gotgctl & GOTGCTL_CONID_B) {
dwc2_vbus_supply_exit(hsotg);
/* Wait for switch to device mode */
dev_dbg(hsotg->dev, "connId B\n");
if (hsotg->bus_suspended) {
dev_info(hsotg->dev,
"Do port resume before switching to device mode\n");
dwc2_port_resume(hsotg);
}
while (!dwc2_is_device_mode(hsotg)) {
dev_info(hsotg->dev,
"Waiting for Peripheral Mode, Mode=%s\n",
dwc2_is_host_mode(hsotg) ? "Host" :
"Peripheral");
msleep(20);
/*
* Sometimes the initial GOTGCTRL read is wrong, so
* check it again and jump to host mode if that was
* the case.
*/
gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
if (!(gotgctl & GOTGCTL_CONID_B))
goto host;
if (++count > 250)
break;
}
if (count > 250)
dev_err(hsotg->dev,
"Connection id status change timed out\n");
hsotg->op_state = OTG_STATE_B_PERIPHERAL;
dwc2_core_init(hsotg, false);
dwc2_enable_global_interrupts(hsotg);
spin_lock_irqsave(&hsotg->lock, flags);
dwc2_hsotg_core_init_disconnected(hsotg, false);
spin_unlock_irqrestore(&hsotg->lock, flags);
/* Enable ACG feature in device mode,if supported */
dwc2_enable_acg(hsotg);
dwc2_hsotg_core_connect(hsotg);
} else {
host:
/* A-Device connector (Host Mode) */
dev_dbg(hsotg->dev, "connId A\n");
while (!dwc2_is_host_mode(hsotg)) {
dev_info(hsotg->dev, "Waiting for Host Mode, Mode=%s\n",
dwc2_is_host_mode(hsotg) ?
"Host" : "Peripheral");
msleep(20);
if (++count > 250)
break;
}
if (count > 250)
dev_err(hsotg->dev,
"Connection id status change timed out\n");
spin_lock_irqsave(&hsotg->lock, flags);
dwc2_hsotg_disconnect(hsotg);
spin_unlock_irqrestore(&hsotg->lock, flags);
hsotg->op_state = OTG_STATE_A_HOST;
/* Initialize the Core for Host mode */
dwc2_core_init(hsotg, false);
dwc2_enable_global_interrupts(hsotg);
dwc2_hcd_start(hsotg);
}
}
static void dwc2_wakeup_detected(struct timer_list *t)
{
struct dwc2_hsotg *hsotg = from_timer(hsotg, t, wkp_timer);
u32 hprt0;
dev_dbg(hsotg->dev, "%s()\n", __func__);
/*
* Clear the Resume after 70ms. (Need 20 ms minimum. Use 70 ms
* so that OPT tests pass with all PHYs.)
*/
hprt0 = dwc2_read_hprt0(hsotg);
dev_dbg(hsotg->dev, "Resume: HPRT0=%0x\n", hprt0);
hprt0 &= ~HPRT0_RES;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
dev_dbg(hsotg->dev, "Clear Resume: HPRT0=%0x\n",
dwc2_readl(hsotg->regs + HPRT0));
dwc2_hcd_rem_wakeup(hsotg);
hsotg->bus_suspended = false;
/* Change to L0 state */
hsotg->lx_state = DWC2_L0;
}
static int dwc2_host_is_b_hnp_enabled(struct dwc2_hsotg *hsotg)
{
struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);
return hcd->self.b_hnp_enable;
}
/* Must NOT be called with interrupt disabled or spinlock held */
static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
{
unsigned long flags;
u32 hprt0;
u32 pcgctl;
u32 gotgctl;
dev_dbg(hsotg->dev, "%s()\n", __func__);
spin_lock_irqsave(&hsotg->lock, flags);
if (windex == hsotg->otg_port && dwc2_host_is_b_hnp_enabled(hsotg)) {
gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
gotgctl |= GOTGCTL_HSTSETHNPEN;
dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
hsotg->op_state = OTG_STATE_A_SUSPEND;
}
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 |= HPRT0_SUSP;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
hsotg->bus_suspended = true;
/*
* If power_down is supported, Phy clock will be suspended
* after registers are backuped.
*/
if (!hsotg->params.power_down) {
/* Suspend the Phy Clock */
pcgctl = dwc2_readl(hsotg->regs + PCGCTL);
pcgctl |= PCGCTL_STOPPCLK;
dwc2_writel(pcgctl, hsotg->regs + PCGCTL);
udelay(10);
}
/* For HNP the bus must be suspended for at least 200ms */
if (dwc2_host_is_b_hnp_enabled(hsotg)) {
pcgctl = dwc2_readl(hsotg->regs + PCGCTL);
pcgctl &= ~PCGCTL_STOPPCLK;
dwc2_writel(pcgctl, hsotg->regs + PCGCTL);
spin_unlock_irqrestore(&hsotg->lock, flags);
msleep(200);
} else {
spin_unlock_irqrestore(&hsotg->lock, flags);
}
}
/* Must NOT be called with interrupt disabled or spinlock held */
static void dwc2_port_resume(struct dwc2_hsotg *hsotg)
{
unsigned long flags;
u32 hprt0;
u32 pcgctl;
spin_lock_irqsave(&hsotg->lock, flags);
/*
* If power_down is supported, Phy clock is already resumed
* after registers restore.
*/
if (!hsotg->params.power_down) {
pcgctl = dwc2_readl(hsotg->regs + PCGCTL);
pcgctl &= ~PCGCTL_STOPPCLK;
dwc2_writel(pcgctl, hsotg->regs + PCGCTL);
spin_unlock_irqrestore(&hsotg->lock, flags);
msleep(20);
spin_lock_irqsave(&hsotg->lock, flags);
}
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 |= HPRT0_RES;
hprt0 &= ~HPRT0_SUSP;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
spin_unlock_irqrestore(&hsotg->lock, flags);
msleep(USB_RESUME_TIMEOUT);
spin_lock_irqsave(&hsotg->lock, flags);
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 &= ~(HPRT0_RES | HPRT0_SUSP);
dwc2_writel(hprt0, hsotg->regs + HPRT0);
hsotg->bus_suspended = false;
spin_unlock_irqrestore(&hsotg->lock, flags);
}
/* Handles hub class-specific requests */
static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
u16 wvalue, u16 windex, char *buf, u16 wlength)
{
struct usb_hub_descriptor *hub_desc;
int retval = 0;
u32 hprt0;
u32 port_status;
u32 speed;
u32 pcgctl;
switch (typereq) {
case ClearHubFeature:
dev_dbg(hsotg->dev, "ClearHubFeature %1xh\n", wvalue);
switch (wvalue) {
case C_HUB_LOCAL_POWER:
case C_HUB_OVER_CURRENT:
/* Nothing required here */
break;
default:
retval = -EINVAL;
dev_err(hsotg->dev,
"ClearHubFeature request %1xh unknown\n",
wvalue);
}
break;
case ClearPortFeature:
if (wvalue != USB_PORT_FEAT_L1)
if (!windex || windex > 1)
goto error;
switch (wvalue) {
case USB_PORT_FEAT_ENABLE:
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_ENABLE\n");
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 |= HPRT0_ENA;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
break;
case USB_PORT_FEAT_SUSPEND:
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_SUSPEND\n");
if (hsotg->bus_suspended) {
if (hsotg->hibernated)
dwc2_exit_hibernation(hsotg, 0, 0, 1);
else
dwc2_port_resume(hsotg);
}
break;
case USB_PORT_FEAT_POWER:
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_POWER\n");
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 &= ~HPRT0_PWR;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
break;
case USB_PORT_FEAT_INDICATOR:
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_INDICATOR\n");
/* Port indicator not supported */
break;
case USB_PORT_FEAT_C_CONNECTION:
/*
* Clears driver's internal Connect Status Change flag
*/
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_C_CONNECTION\n");
hsotg->flags.b.port_connect_status_change = 0;
break;
case USB_PORT_FEAT_C_RESET:
/* Clears driver's internal Port Reset Change flag */
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_C_RESET\n");
hsotg->flags.b.port_reset_change = 0;
break;
case USB_PORT_FEAT_C_ENABLE:
/*
* Clears the driver's internal Port Enable/Disable
* Change flag
*/
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_C_ENABLE\n");
hsotg->flags.b.port_enable_change = 0;
break;
case USB_PORT_FEAT_C_SUSPEND:
/*
* Clears the driver's internal Port Suspend Change
* flag, which is set when resume signaling on the host
* port is complete
*/
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_C_SUSPEND\n");
hsotg->flags.b.port_suspend_change = 0;
break;
case USB_PORT_FEAT_C_PORT_L1:
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_C_PORT_L1\n");
hsotg->flags.b.port_l1_change = 0;
break;
case USB_PORT_FEAT_C_OVER_CURRENT:
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_C_OVER_CURRENT\n");
hsotg->flags.b.port_over_current_change = 0;
break;
default:
retval = -EINVAL;
dev_err(hsotg->dev,
"ClearPortFeature request %1xh unknown or unsupported\n",
wvalue);
}
break;
case GetHubDescriptor:
dev_dbg(hsotg->dev, "GetHubDescriptor\n");
hub_desc = (struct usb_hub_descriptor *)buf;
hub_desc->bDescLength = 9;
hub_desc->bDescriptorType = USB_DT_HUB;
hub_desc->bNbrPorts = 1;
hub_desc->wHubCharacteristics =
cpu_to_le16(HUB_CHAR_COMMON_LPSM |
HUB_CHAR_INDV_PORT_OCPM);
hub_desc->bPwrOn2PwrGood = 1;
hub_desc->bHubContrCurrent = 0;
hub_desc->u.hs.DeviceRemovable[0] = 0;
hub_desc->u.hs.DeviceRemovable[1] = 0xff;
break;
case GetHubStatus:
dev_dbg(hsotg->dev, "GetHubStatus\n");
memset(buf, 0, 4);
break;
case GetPortStatus:
dev_vdbg(hsotg->dev,
"GetPortStatus wIndex=0x%04x flags=0x%08x\n", windex,
hsotg->flags.d32);
if (!windex || windex > 1)
goto error;
port_status = 0;
if (hsotg->flags.b.port_connect_status_change)
port_status |= USB_PORT_STAT_C_CONNECTION << 16;
if (hsotg->flags.b.port_enable_change)
port_status |= USB_PORT_STAT_C_ENABLE << 16;
if (hsotg->flags.b.port_suspend_change)
port_status |= USB_PORT_STAT_C_SUSPEND << 16;
if (hsotg->flags.b.port_l1_change)
port_status |= USB_PORT_STAT_C_L1 << 16;
if (hsotg->flags.b.port_reset_change)
port_status |= USB_PORT_STAT_C_RESET << 16;
if (hsotg->flags.b.port_over_current_change) {
dev_warn(hsotg->dev, "Overcurrent change detected\n");
port_status |= USB_PORT_STAT_C_OVERCURRENT << 16;
}
if (!hsotg->flags.b.port_connect_status) {
/*
* The port is disconnected, which means the core is
* either in device mode or it soon will be. Just
* return 0's for the remainder of the port status
* since the port register can't be read if the core
* is in device mode.
*/
*(__le32 *)buf = cpu_to_le32(port_status);
break;
}
hprt0 = dwc2_readl(hsotg->regs + HPRT0);
dev_vdbg(hsotg->dev, " HPRT0: 0x%08x\n", hprt0);
if (hprt0 & HPRT0_CONNSTS)
port_status |= USB_PORT_STAT_CONNECTION;
if (hprt0 & HPRT0_ENA)
port_status |= USB_PORT_STAT_ENABLE;
if (hprt0 & HPRT0_SUSP)
port_status |= USB_PORT_STAT_SUSPEND;
if (hprt0 & HPRT0_OVRCURRACT)
port_status |= USB_PORT_STAT_OVERCURRENT;
if (hprt0 & HPRT0_RST)
port_status |= USB_PORT_STAT_RESET;
if (hprt0 & HPRT0_PWR)
port_status |= USB_PORT_STAT_POWER;
speed = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;
if (speed == HPRT0_SPD_HIGH_SPEED)
port_status |= USB_PORT_STAT_HIGH_SPEED;
else if (speed == HPRT0_SPD_LOW_SPEED)
port_status |= USB_PORT_STAT_LOW_SPEED;
if (hprt0 & HPRT0_TSTCTL_MASK)
port_status |= USB_PORT_STAT_TEST;
/* USB_PORT_FEAT_INDICATOR unsupported always 0 */
if (hsotg->params.dma_desc_fs_enable) {
/*
* Enable descriptor DMA only if a full speed
* device is connected.
*/
if (hsotg->new_connection &&
((port_status &
(USB_PORT_STAT_CONNECTION |
USB_PORT_STAT_HIGH_SPEED |
USB_PORT_STAT_LOW_SPEED)) ==
USB_PORT_STAT_CONNECTION)) {
u32 hcfg;
dev_info(hsotg->dev, "Enabling descriptor DMA mode\n");
hsotg->params.dma_desc_enable = true;
hcfg = dwc2_readl(hsotg->regs + HCFG);
hcfg |= HCFG_DESCDMA;
dwc2_writel(hcfg, hsotg->regs + HCFG);
hsotg->new_connection = false;
}
}
dev_vdbg(hsotg->dev, "port_status=%08x\n", port_status);
*(__le32 *)buf = cpu_to_le32(port_status);
break;
case SetHubFeature:
dev_dbg(hsotg->dev, "SetHubFeature\n");
/* No HUB features supported */
break;
case SetPortFeature:
dev_dbg(hsotg->dev, "SetPortFeature\n");
if (wvalue != USB_PORT_FEAT_TEST && (!windex || windex > 1))
goto error;
if (!hsotg->flags.b.port_connect_status) {
/*
* The port is disconnected, which means the core is
* either in device mode or it soon will be. Just
* return without doing anything since the port
* register can't be written if the core is in device
* mode.
*/
break;
}
switch (wvalue) {
case USB_PORT_FEAT_SUSPEND:
dev_dbg(hsotg->dev,
"SetPortFeature - USB_PORT_FEAT_SUSPEND\n");
if (windex != hsotg->otg_port)
goto error;
if (hsotg->params.power_down == 2)
dwc2_enter_hibernation(hsotg, 1);
else
dwc2_port_suspend(hsotg, windex);
break;
case USB_PORT_FEAT_POWER:
dev_dbg(hsotg->dev,
"SetPortFeature - USB_PORT_FEAT_POWER\n");
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 |= HPRT0_PWR;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
break;
case USB_PORT_FEAT_RESET:
if (hsotg->params.power_down == 2 &&
hsotg->hibernated)
dwc2_exit_hibernation(hsotg, 0, 1, 1);
hprt0 = dwc2_read_hprt0(hsotg);
dev_dbg(hsotg->dev,
"SetPortFeature - USB_PORT_FEAT_RESET\n");
pcgctl = dwc2_readl(hsotg->regs + PCGCTL);
pcgctl &= ~(PCGCTL_ENBL_SLEEP_GATING | PCGCTL_STOPPCLK);
dwc2_writel(pcgctl, hsotg->regs + PCGCTL);
/* ??? Original driver does this */
dwc2_writel(0, hsotg->regs + PCGCTL);
hprt0 = dwc2_read_hprt0(hsotg);
/* Clear suspend bit if resetting from suspend state */
hprt0 &= ~HPRT0_SUSP;
/*
* When B-Host the Port reset bit is set in the Start
* HCD Callback function, so that the reset is started
* within 1ms of the HNP success interrupt
*/
if (!dwc2_hcd_is_b_host(hsotg)) {
hprt0 |= HPRT0_PWR | HPRT0_RST;
dev_dbg(hsotg->dev,
"In host mode, hprt0=%08x\n", hprt0);
dwc2_writel(hprt0, hsotg->regs + HPRT0);
}
/* Clear reset bit in 10ms (FS/LS) or 50ms (HS) */
msleep(50);
hprt0 &= ~HPRT0_RST;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
hsotg->lx_state = DWC2_L0; /* Now back to On state */
break;
case USB_PORT_FEAT_INDICATOR:
dev_dbg(hsotg->dev,
"SetPortFeature - USB_PORT_FEAT_INDICATOR\n");
/* Not supported */
break;
case USB_PORT_FEAT_TEST:
hprt0 = dwc2_read_hprt0(hsotg);
dev_dbg(hsotg->dev,
"SetPortFeature - USB_PORT_FEAT_TEST\n");
hprt0 &= ~HPRT0_TSTCTL_MASK;
hprt0 |= (windex >> 8) << HPRT0_TSTCTL_SHIFT;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
break;
default:
retval = -EINVAL;
dev_err(hsotg->dev,
"SetPortFeature %1xh unknown or unsupported\n",
wvalue);
break;
}
break;
default:
error:
retval = -EINVAL;
dev_dbg(hsotg->dev,
"Unknown hub control request: %1xh wIndex: %1xh wValue: %1xh\n",
typereq, windex, wvalue);
break;
}
return retval;
}
static int dwc2_hcd_is_status_changed(struct dwc2_hsotg *hsotg, int port)
{
int retval;
if (port != 1)
return -EINVAL;
retval = (hsotg->flags.b.port_connect_status_change ||
hsotg->flags.b.port_reset_change ||
hsotg->flags.b.port_enable_change ||
hsotg->flags.b.port_suspend_change ||
hsotg->flags.b.port_over_current_change);
if (retval) {
dev_dbg(hsotg->dev,
"DWC OTG HCD HUB STATUS DATA: Root port status changed\n");
dev_dbg(hsotg->dev, " port_connect_status_change: %d\n",
hsotg->flags.b.port_connect_status_change);
dev_dbg(hsotg->dev, " port_reset_change: %d\n",
hsotg->flags.b.port_reset_change);
dev_dbg(hsotg->dev, " port_enable_change: %d\n",
hsotg->flags.b.port_enable_change);
dev_dbg(hsotg->dev, " port_suspend_change: %d\n",
hsotg->flags.b.port_suspend_change);
dev_dbg(hsotg->dev, " port_over_current_change: %d\n",
hsotg->flags.b.port_over_current_change);
}
return retval;
}
int dwc2_hcd_get_frame_number(struct dwc2_hsotg *hsotg)
{
u32 hfnum = dwc2_readl(hsotg->regs + HFNUM);
#ifdef DWC2_DEBUG_SOF
dev_vdbg(hsotg->dev, "DWC OTG HCD GET FRAME NUMBER %d\n",
(hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT);
#endif
return (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
}
int dwc2_hcd_get_future_frame_number(struct dwc2_hsotg *hsotg, int us)
{
u32 hprt = dwc2_readl(hsotg->regs + HPRT0);
u32 hfir = dwc2_readl(hsotg->regs + HFIR);
u32 hfnum = dwc2_readl(hsotg->regs + HFNUM);
unsigned int us_per_frame;
unsigned int frame_number;
unsigned int remaining;
unsigned int interval;
unsigned int phy_clks;
/* High speed has 125 us per (micro) frame; others are 1 ms per */
us_per_frame = (hprt & HPRT0_SPD_MASK) ? 1000 : 125;
/* Extract fields */
frame_number = (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
remaining = (hfnum & HFNUM_FRREM_MASK) >> HFNUM_FRREM_SHIFT;
interval = (hfir & HFIR_FRINT_MASK) >> HFIR_FRINT_SHIFT;
/*
* Number of phy clocks since the last tick of the frame number after
* "us" has passed.
*/
phy_clks = (interval - remaining) +
DIV_ROUND_UP(interval * us, us_per_frame);
return dwc2_frame_num_inc(frame_number, phy_clks / interval);
}
int dwc2_hcd_is_b_host(struct dwc2_hsotg *hsotg)
{
return hsotg->op_state == OTG_STATE_B_HOST;
}
static struct dwc2_hcd_urb *dwc2_hcd_urb_alloc(struct dwc2_hsotg *hsotg,
int iso_desc_count,
gfp_t mem_flags)
{
struct dwc2_hcd_urb *urb;
u32 size = sizeof(*urb) + iso_desc_count *
sizeof(struct dwc2_hcd_iso_packet_desc);
urb = kzalloc(size, mem_flags);
if (urb)
urb->packet_count = iso_desc_count;
return urb;
}
static void dwc2_hcd_urb_set_pipeinfo(struct dwc2_hsotg *hsotg,
struct dwc2_hcd_urb *urb, u8 dev_addr,
u8 ep_num, u8 ep_type, u8 ep_dir, u16 mps)
{
if (dbg_perio() ||
ep_type == USB_ENDPOINT_XFER_BULK ||
ep_type == USB_ENDPOINT_XFER_CONTROL)
dev_vdbg(hsotg->dev,
"addr=%d, ep_num=%d, ep_dir=%1x, ep_type=%1x, mps=%d\n",
dev_addr, ep_num, ep_dir, ep_type, mps);
urb->pipe_info.dev_addr = dev_addr;
urb->pipe_info.ep_num = ep_num;
urb->pipe_info.pipe_type = ep_type;
urb->pipe_info.pipe_dir = ep_dir;
urb->pipe_info.mps = mps;
}
/*
* NOTE: This function will be removed once the peripheral controller code
* is integrated and the driver is stable
*/
void dwc2_hcd_dump_state(struct dwc2_hsotg *hsotg)
{
#ifdef DEBUG
struct dwc2_host_chan *chan;
struct dwc2_hcd_urb *urb;
struct dwc2_qtd *qtd;
int num_channels;
u32 np_tx_status;
u32 p_tx_status;
int i;
num_channels = hsotg->params.host_channels;
dev_dbg(hsotg->dev, "\n");
dev_dbg(hsotg->dev,
"************************************************************\n");
dev_dbg(hsotg->dev, "HCD State:\n");
dev_dbg(hsotg->dev, " Num channels: %d\n", num_channels);
for (i = 0; i < num_channels; i++) {
chan = hsotg->hc_ptr_array[i];
dev_dbg(hsotg->dev, " Channel %d:\n", i);
dev_dbg(hsotg->dev,
" dev_addr: %d, ep_num: %d, ep_is_in: %d\n",
chan->dev_addr, chan->ep_num, chan->ep_is_in);
dev_dbg(hsotg->dev, " speed: %d\n", chan->speed);
dev_dbg(hsotg->dev, " ep_type: %d\n", chan->ep_type);
dev_dbg(hsotg->dev, " max_packet: %d\n", chan->max_packet);
dev_dbg(hsotg->dev, " data_pid_start: %d\n",
chan->data_pid_start);
dev_dbg(hsotg->dev, " multi_count: %d\n", chan->multi_count);
dev_dbg(hsotg->dev, " xfer_started: %d\n",
chan->xfer_started);
dev_dbg(hsotg->dev, " xfer_buf: %p\n", chan->xfer_buf);
dev_dbg(hsotg->dev, " xfer_dma: %08lx\n",
(unsigned long)chan->xfer_dma);
dev_dbg(hsotg->dev, " xfer_len: %d\n", chan->xfer_len);
dev_dbg(hsotg->dev, " xfer_count: %d\n", chan->xfer_count);
dev_dbg(hsotg->dev, " halt_on_queue: %d\n",
chan->halt_on_queue);
dev_dbg(hsotg->dev, " halt_pending: %d\n",
chan->halt_pending);
dev_dbg(hsotg->dev, " halt_status: %d\n", chan->halt_status);
dev_dbg(hsotg->dev, " do_split: %d\n", chan->do_split);
dev_dbg(hsotg->dev, " complete_split: %d\n",
chan->complete_split);
dev_dbg(hsotg->dev, " hub_addr: %d\n", chan->hub_addr);
dev_dbg(hsotg->dev, " hub_port: %d\n", chan->hub_port);
dev_dbg(hsotg->dev, " xact_pos: %d\n", chan->xact_pos);
dev_dbg(hsotg->dev, " requests: %d\n", chan->requests);
dev_dbg(hsotg->dev, " qh: %p\n", chan->qh);
if (chan->xfer_started) {
u32 hfnum, hcchar, hctsiz, hcint, hcintmsk;
hfnum = dwc2_readl(hsotg->regs + HFNUM);
hcchar = dwc2_readl(hsotg->regs + HCCHAR(i));
hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(i));
hcint = dwc2_readl(hsotg->regs + HCINT(i));
hcintmsk = dwc2_readl(hsotg->regs + HCINTMSK(i));
dev_dbg(hsotg->dev, " hfnum: 0x%08x\n", hfnum);
dev_dbg(hsotg->dev, " hcchar: 0x%08x\n", hcchar);
dev_dbg(hsotg->dev, " hctsiz: 0x%08x\n", hctsiz);
dev_dbg(hsotg->dev, " hcint: 0x%08x\n", hcint);
dev_dbg(hsotg->dev, " hcintmsk: 0x%08x\n", hcintmsk);
}
if (!(chan->xfer_started && chan->qh))
continue;
list_for_each_entry(qtd, &chan->qh->qtd_list, qtd_list_entry) {
if (!qtd->in_process)
break;
urb = qtd->urb;
dev_dbg(hsotg->dev, " URB Info:\n");
dev_dbg(hsotg->dev, " qtd: %p, urb: %p\n",
qtd, urb);
if (urb) {
dev_dbg(hsotg->dev,
" Dev: %d, EP: %d %s\n",
dwc2_hcd_get_dev_addr(&urb->pipe_info),
dwc2_hcd_get_ep_num(&urb->pipe_info),
dwc2_hcd_is_pipe_in(&urb->pipe_info) ?
"IN" : "OUT");
dev_dbg(hsotg->dev,
" Max packet size: %d\n",
dwc2_hcd_get_mps(&urb->pipe_info));
dev_dbg(hsotg->dev,
" transfer_buffer: %p\n",
urb->buf);
dev_dbg(hsotg->dev,
" transfer_dma: %08lx\n",
(unsigned long)urb->dma);
dev_dbg(hsotg->dev,
" transfer_buffer_length: %d\n",
urb->length);
dev_dbg(hsotg->dev, " actual_length: %d\n",
urb->actual_length);
}
}
}
dev_dbg(hsotg->dev, " non_periodic_channels: %d\n",
hsotg->non_periodic_channels);
dev_dbg(hsotg->dev, " periodic_channels: %d\n",
hsotg->periodic_channels);
dev_dbg(hsotg->dev, " periodic_usecs: %d\n", hsotg->periodic_usecs);
np_tx_status = dwc2_readl(hsotg->regs + GNPTXSTS);
dev_dbg(hsotg->dev, " NP Tx Req Queue Space Avail: %d\n",
(np_tx_status & TXSTS_QSPCAVAIL_MASK) >> TXSTS_QSPCAVAIL_SHIFT);
dev_dbg(hsotg->dev, " NP Tx FIFO Space Avail: %d\n",
(np_tx_status & TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT);
p_tx_status = dwc2_readl(hsotg->regs + HPTXSTS);
dev_dbg(hsotg->dev, " P Tx Req Queue Space Avail: %d\n",
(p_tx_status & TXSTS_QSPCAVAIL_MASK) >> TXSTS_QSPCAVAIL_SHIFT);
dev_dbg(hsotg->dev, " P Tx FIFO Space Avail: %d\n",
(p_tx_status & TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT);
dwc2_dump_global_registers(hsotg);
dwc2_dump_host_registers(hsotg);
dev_dbg(hsotg->dev,
"************************************************************\n");
dev_dbg(hsotg->dev, "\n");
#endif
}
struct wrapper_priv_data {
struct dwc2_hsotg *hsotg;
};
/* Gets the dwc2_hsotg from a usb_hcd */
static struct dwc2_hsotg *dwc2_hcd_to_hsotg(struct usb_hcd *hcd)
{
struct wrapper_priv_data *p;
p = (struct wrapper_priv_data *)&hcd->hcd_priv;
return p->hsotg;
}
/**
* dwc2_host_get_tt_info() - Get the dwc2_tt associated with context
*
* This will get the dwc2_tt structure (and ttport) associated with the given
* context (which is really just a struct urb pointer).
*
* The first time this is called for a given TT we allocate memory for our
* structure. When everyone is done and has called dwc2_host_put_tt_info()
* then the refcount for the structure will go to 0 and we'll free it.
*
* @hsotg: The HCD state structure for the DWC OTG controller.
* @context: The priv pointer from a struct dwc2_hcd_urb.
* @mem_flags: Flags for allocating memory.
* @ttport: We'll return this device's port number here. That's used to
* reference into the bitmap if we're on a multi_tt hub.
*
* Return: a pointer to a struct dwc2_tt. Don't forget to call
* dwc2_host_put_tt_info()! Returns NULL upon memory alloc failure.
*/
struct dwc2_tt *dwc2_host_get_tt_info(struct dwc2_hsotg *hsotg, void *context,
gfp_t mem_flags, int *ttport)
{
struct urb *urb = context;
struct dwc2_tt *dwc_tt = NULL;
if (urb->dev->tt) {
*ttport = urb->dev->ttport;
dwc_tt = urb->dev->tt->hcpriv;
if (!dwc_tt) {
size_t bitmap_size;
/*
* For single_tt we need one schedule. For multi_tt
* we need one per port.
*/
bitmap_size = DWC2_ELEMENTS_PER_LS_BITMAP *
sizeof(dwc_tt->periodic_bitmaps[0]);
if (urb->dev->tt->multi)
bitmap_size *= urb->dev->tt->hub->maxchild;
dwc_tt = kzalloc(sizeof(*dwc_tt) + bitmap_size,
mem_flags);
if (!dwc_tt)
return NULL;
dwc_tt->usb_tt = urb->dev->tt;
dwc_tt->usb_tt->hcpriv = dwc_tt;
}
dwc_tt->refcount++;
}
return dwc_tt;
}
/**
* dwc2_host_put_tt_info() - Put the dwc2_tt from dwc2_host_get_tt_info()
*
* Frees resources allocated by dwc2_host_get_tt_info() if all current holders
* of the structure are done.
*
* It's OK to call this with NULL.
*
* @hsotg: The HCD state structure for the DWC OTG controller.
* @dwc_tt: The pointer returned by dwc2_host_get_tt_info.
*/
void dwc2_host_put_tt_info(struct dwc2_hsotg *hsotg, struct dwc2_tt *dwc_tt)
{
/* Model kfree and make put of NULL a no-op */
if (!dwc_tt)
return;
WARN_ON(dwc_tt->refcount < 1);
dwc_tt->refcount--;
if (!dwc_tt->refcount) {
dwc_tt->usb_tt->hcpriv = NULL;
kfree(dwc_tt);
}
}
int dwc2_host_get_speed(struct dwc2_hsotg *hsotg, void *context)
{
struct urb *urb = context;
return urb->dev->speed;
}
static void dwc2_allocate_bus_bandwidth(struct usb_hcd *hcd, u16 bw,
struct urb *urb)
{
struct usb_bus *bus = hcd_to_bus(hcd);
if (urb->interval)
bus->bandwidth_allocated += bw / urb->interval;
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
bus->bandwidth_isoc_reqs++;
else
bus->bandwidth_int_reqs++;
}
static void dwc2_free_bus_bandwidth(struct usb_hcd *hcd, u16 bw,
struct urb *urb)
{
struct usb_bus *bus = hcd_to_bus(hcd);
if (urb->interval)
bus->bandwidth_allocated -= bw / urb->interval;
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
bus->bandwidth_isoc_reqs--;
else
bus->bandwidth_int_reqs--;
}
/*
* Sets the final status of an URB and returns it to the upper layer. Any
* required cleanup of the URB is performed.
*
* Must be called with interrupt disabled and spinlock held
*/
void dwc2_host_complete(struct dwc2_hsotg *hsotg, struct dwc2_qtd *qtd,
int status)
{
struct urb *urb;
int i;
if (!qtd) {
dev_dbg(hsotg->dev, "## %s: qtd is NULL ##\n", __func__);
return;
}
if (!qtd->urb) {
dev_dbg(hsotg->dev, "## %s: qtd->urb is NULL ##\n", __func__);
return;
}
urb = qtd->urb->priv;
if (!urb) {
dev_dbg(hsotg->dev, "## %s: urb->priv is NULL ##\n", __func__);
return;
}
urb->actual_length = dwc2_hcd_urb_get_actual_length(qtd->urb);
if (dbg_urb(urb))
dev_vdbg(hsotg->dev,
"%s: urb %p device %d ep %d-%s status %d actual %d\n",
__func__, urb, usb_pipedevice(urb->pipe),
usb_pipeendpoint(urb->pipe),
usb_pipein(urb->pipe) ? "IN" : "OUT", status,
urb->actual_length);
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
urb->error_count = dwc2_hcd_urb_get_error_count(qtd->urb);
for (i = 0; i < urb->number_of_packets; ++i) {
urb->iso_frame_desc[i].actual_length =
dwc2_hcd_urb_get_iso_desc_actual_length(
qtd->urb, i);
urb->iso_frame_desc[i].status =
dwc2_hcd_urb_get_iso_desc_status(qtd->urb, i);
}
}
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS && dbg_perio()) {
for (i = 0; i < urb->number_of_packets; i++)
dev_vdbg(hsotg->dev, " ISO Desc %d status %d\n",
i, urb->iso_frame_desc[i].status);
}
urb->status = status;
if (!status) {
if ((urb->transfer_flags & URB_SHORT_NOT_OK) &&
urb->actual_length < urb->transfer_buffer_length)
urb->status = -EREMOTEIO;
}
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS ||
usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
struct usb_host_endpoint *ep = urb->ep;
if (ep)
dwc2_free_bus_bandwidth(dwc2_hsotg_to_hcd(hsotg),
dwc2_hcd_get_ep_bandwidth(hsotg, ep),
urb);
}
usb_hcd_unlink_urb_from_ep(dwc2_hsotg_to_hcd(hsotg), urb);
urb->hcpriv = NULL;
kfree(qtd->urb);
qtd->urb = NULL;
usb_hcd_giveback_urb(dwc2_hsotg_to_hcd(hsotg), urb, status);
}
/*
* Work queue function for starting the HCD when A-Cable is connected
*/
static void dwc2_hcd_start_func(struct work_struct *work)
{
struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
start_work.work);
dev_dbg(hsotg->dev, "%s() %p\n", __func__, hsotg);
dwc2_host_start(hsotg);
}
/*
* Reset work queue function
*/
static void dwc2_hcd_reset_func(struct work_struct *work)
{
struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
reset_work.work);
unsigned long flags;
u32 hprt0;
dev_dbg(hsotg->dev, "USB RESET function called\n");
spin_lock_irqsave(&hsotg->lock, flags);
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 &= ~HPRT0_RST;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
hsotg->flags.b.port_reset_change = 1;
spin_unlock_irqrestore(&hsotg->lock, flags);
}
/*
* =========================================================================
* Linux HC Driver Functions
* =========================================================================
*/
/*
* Initializes the DWC_otg controller and its root hub and prepares it for host
* mode operation. Activates the root port. Returns 0 on success and a negative
* error code on failure.
*/
static int _dwc2_hcd_start(struct usb_hcd *hcd)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
struct usb_bus *bus = hcd_to_bus(hcd);
unsigned long flags;
dev_dbg(hsotg->dev, "DWC OTG HCD START\n");
spin_lock_irqsave(&hsotg->lock, flags);
hsotg->lx_state = DWC2_L0;
hcd->state = HC_STATE_RUNNING;
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
if (dwc2_is_device_mode(hsotg)) {
spin_unlock_irqrestore(&hsotg->lock, flags);
return 0; /* why 0 ?? */
}
dwc2_hcd_reinit(hsotg);
/* Initialize and connect root hub if one is not already attached */
if (bus->root_hub) {
dev_dbg(hsotg->dev, "DWC OTG HCD Has Root Hub\n");
/* Inform the HUB driver to resume */
usb_hcd_resume_root_hub(hcd);
}
spin_unlock_irqrestore(&hsotg->lock, flags);
return dwc2_vbus_supply_init(hsotg);
}
/*
* Halts the DWC_otg host mode operations in a clean manner. USB transfers are
* stopped.
*/
static void _dwc2_hcd_stop(struct usb_hcd *hcd)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
unsigned long flags;
/* Turn off all host-specific interrupts */
dwc2_disable_host_interrupts(hsotg);
/* Wait for interrupt processing to finish */
synchronize_irq(hcd->irq);
spin_lock_irqsave(&hsotg->lock, flags);
/* Ensure hcd is disconnected */
dwc2_hcd_disconnect(hsotg, true);
dwc2_hcd_stop(hsotg);
hsotg->lx_state = DWC2_L3;
hcd->state = HC_STATE_HALT;
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_vbus_supply_exit(hsotg);
usleep_range(1000, 3000);
}
static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
unsigned long flags;
int ret = 0;
u32 hprt0;
spin_lock_irqsave(&hsotg->lock, flags);
if (dwc2_is_device_mode(hsotg))
goto unlock;
if (hsotg->lx_state != DWC2_L0)
goto unlock;
if (!HCD_HW_ACCESSIBLE(hcd))
goto unlock;
if (hsotg->op_state == OTG_STATE_B_PERIPHERAL)
goto unlock;
if (hsotg->params.power_down != DWC2_POWER_DOWN_PARAM_PARTIAL)
goto skip_power_saving;
/*
* Drive USB suspend and disable port Power
* if usb bus is not suspended.
*/
if (!hsotg->bus_suspended) {
hprt0 = dwc2_read_hprt0(hsotg);
hprt0 |= HPRT0_SUSP;
hprt0 &= ~HPRT0_PWR;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
dwc2_vbus_supply_exit(hsotg);
}
/* Enter partial_power_down */
ret = dwc2_enter_partial_power_down(hsotg);
if (ret) {
if (ret != -ENOTSUPP)
dev_err(hsotg->dev,
"enter partial_power_down failed\n");
goto skip_power_saving;
}
/* Ask phy to be suspended */
if (!IS_ERR_OR_NULL(hsotg->uphy)) {
spin_unlock_irqrestore(&hsotg->lock, flags);
usb_phy_set_suspend(hsotg->uphy, true);
spin_lock_irqsave(&hsotg->lock, flags);
}
/* After entering partial_power_down, hardware is no more accessible */
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
skip_power_saving:
hsotg->lx_state = DWC2_L2;
unlock:
spin_unlock_irqrestore(&hsotg->lock, flags);
return ret;
}
static int _dwc2_hcd_resume(struct usb_hcd *hcd)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&hsotg->lock, flags);
if (dwc2_is_device_mode(hsotg))
goto unlock;
if (hsotg->lx_state != DWC2_L2)
goto unlock;
if (hsotg->params.power_down != DWC2_POWER_DOWN_PARAM_PARTIAL) {
hsotg->lx_state = DWC2_L0;
goto unlock;
}
/*
* Set HW accessible bit before powering on the controller
* since an interrupt may rise.
*/
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
/*
* Enable power if not already done.
* This must not be spinlocked since duration
* of this call is unknown.
*/
if (!IS_ERR_OR_NULL(hsotg->uphy)) {
spin_unlock_irqrestore(&hsotg->lock, flags);
usb_phy_set_suspend(hsotg->uphy, false);
spin_lock_irqsave(&hsotg->lock, flags);
}
/* Exit partial_power_down */
ret = dwc2_exit_partial_power_down(hsotg, true);
if (ret && (ret != -ENOTSUPP))
dev_err(hsotg->dev, "exit partial_power_down failed\n");
hsotg->lx_state = DWC2_L0;
spin_unlock_irqrestore(&hsotg->lock, flags);
if (hsotg->bus_suspended) {
spin_lock_irqsave(&hsotg->lock, flags);
hsotg->flags.b.port_suspend_change = 1;
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_port_resume(hsotg);
} else {
dwc2_vbus_supply_init(hsotg);
/* Wait for controller to correctly update D+/D- level */
usleep_range(3000, 5000);
/*
* Clear Port Enable and Port Status changes.
* Enable Port Power.
*/
dwc2_writel(HPRT0_PWR | HPRT0_CONNDET |
HPRT0_ENACHG, hsotg->regs + HPRT0);
/* Wait for controller to detect Port Connect */
usleep_range(5000, 7000);
}
return ret;
unlock:
spin_unlock_irqrestore(&hsotg->lock, flags);
return ret;
}
/* Returns the current frame number */
static int _dwc2_hcd_get_frame_number(struct usb_hcd *hcd)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
return dwc2_hcd_get_frame_number(hsotg);
}
static void dwc2_dump_urb_info(struct usb_hcd *hcd, struct urb *urb,
char *fn_name)
{
#ifdef VERBOSE_DEBUG
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
char *pipetype = NULL;
char *speed = NULL;
dev_vdbg(hsotg->dev, "%s, urb %p\n", fn_name, urb);
dev_vdbg(hsotg->dev, " Device address: %d\n",
usb_pipedevice(urb->pipe));
dev_vdbg(hsotg->dev, " Endpoint: %d, %s\n",
usb_pipeendpoint(urb->pipe),
usb_pipein(urb->pipe) ? "IN" : "OUT");
switch (usb_pipetype(urb->pipe)) {
case PIPE_CONTROL:
pipetype = "CONTROL";
break;
case PIPE_BULK:
pipetype = "BULK";
break;
case PIPE_INTERRUPT:
pipetype = "INTERRUPT";
break;
case PIPE_ISOCHRONOUS:
pipetype = "ISOCHRONOUS";
break;
}
dev_vdbg(hsotg->dev, " Endpoint type: %s %s (%s)\n", pipetype,
usb_urb_dir_in(urb) ? "IN" : "OUT", usb_pipein(urb->pipe) ?
"IN" : "OUT");
switch (urb->dev->speed) {
case USB_SPEED_HIGH:
speed = "HIGH";
break;
case USB_SPEED_FULL:
speed = "FULL";
break;
case USB_SPEED_LOW:
speed = "LOW";
break;
default:
speed = "UNKNOWN";
break;
}
dev_vdbg(hsotg->dev, " Speed: %s\n", speed);
dev_vdbg(hsotg->dev, " Max packet size: %d\n",
usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)));
dev_vdbg(hsotg->dev, " Data buffer length: %d\n",
urb->transfer_buffer_length);
dev_vdbg(hsotg->dev, " Transfer buffer: %p, Transfer DMA: %08lx\n",
urb->transfer_buffer, (unsigned long)urb->transfer_dma);
dev_vdbg(hsotg->dev, " Setup buffer: %p, Setup DMA: %08lx\n",
urb->setup_packet, (unsigned long)urb->setup_dma);
dev_vdbg(hsotg->dev, " Interval: %d\n", urb->interval);
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
int i;
for (i = 0; i < urb->number_of_packets; i++) {
dev_vdbg(hsotg->dev, " ISO Desc %d:\n", i);
dev_vdbg(hsotg->dev, " offset: %d, length %d\n",
urb->iso_frame_desc[i].offset,
urb->iso_frame_desc[i].length);
}
}
#endif
}
/*
* Starts processing a USB transfer request specified by a USB Request Block
* (URB). mem_flags indicates the type of memory allocation to use while
* processing this URB.
*/
static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
gfp_t mem_flags)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
struct usb_host_endpoint *ep = urb->ep;
struct dwc2_hcd_urb *dwc2_urb;
int i;
int retval;
int alloc_bandwidth = 0;
u8 ep_type = 0;
u32 tflags = 0;
void *buf;
unsigned long flags;
struct dwc2_qh *qh;
bool qh_allocated = false;
struct dwc2_qtd *qtd;
if (dbg_urb(urb)) {
dev_vdbg(hsotg->dev, "DWC OTG HCD URB Enqueue\n");
dwc2_dump_urb_info(hcd, urb, "urb_enqueue");
}
if (!ep)
return -EINVAL;
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS ||
usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
spin_lock_irqsave(&hsotg->lock, flags);
if (!dwc2_hcd_is_bandwidth_allocated(hsotg, ep))
alloc_bandwidth = 1;
spin_unlock_irqrestore(&hsotg->lock, flags);
}
switch (usb_pipetype(urb->pipe)) {
case PIPE_CONTROL:
ep_type = USB_ENDPOINT_XFER_CONTROL;
break;
case PIPE_ISOCHRONOUS:
ep_type = USB_ENDPOINT_XFER_ISOC;
break;
case PIPE_BULK:
ep_type = USB_ENDPOINT_XFER_BULK;
break;
case PIPE_INTERRUPT:
ep_type = USB_ENDPOINT_XFER_INT;
break;
}
dwc2_urb = dwc2_hcd_urb_alloc(hsotg, urb->number_of_packets,
mem_flags);
if (!dwc2_urb)
return -ENOMEM;
dwc2_hcd_urb_set_pipeinfo(hsotg, dwc2_urb, usb_pipedevice(urb->pipe),
usb_pipeendpoint(urb->pipe), ep_type,
usb_pipein(urb->pipe),
usb_maxpacket(urb->dev, urb->pipe,
!(usb_pipein(urb->pipe))));
buf = urb->transfer_buffer;
if (hcd->self.uses_dma) {
if (!buf && (urb->transfer_dma & 3)) {
dev_err(hsotg->dev,
"%s: unaligned transfer with no transfer_buffer",
__func__);
retval = -EINVAL;
goto fail0;
}
}
if (!(urb->transfer_flags & URB_NO_INTERRUPT))
tflags |= URB_GIVEBACK_ASAP;
if (urb->transfer_flags & URB_ZERO_PACKET)
tflags |= URB_SEND_ZERO_PACKET;
dwc2_urb->priv = urb;
dwc2_urb->buf = buf;
dwc2_urb->dma = urb->transfer_dma;
dwc2_urb->length = urb->transfer_buffer_length;
dwc2_urb->setup_packet = urb->setup_packet;
dwc2_urb->setup_dma = urb->setup_dma;
dwc2_urb->flags = tflags;
dwc2_urb->interval = urb->interval;
dwc2_urb->status = -EINPROGRESS;
for (i = 0; i < urb->number_of_packets; ++i)
dwc2_hcd_urb_set_iso_desc_params(dwc2_urb, i,
urb->iso_frame_desc[i].offset,
urb->iso_frame_desc[i].length);
urb->hcpriv = dwc2_urb;
qh = (struct dwc2_qh *)ep->hcpriv;
/* Create QH for the endpoint if it doesn't exist */
if (!qh) {
qh = dwc2_hcd_qh_create(hsotg, dwc2_urb, mem_flags);
if (!qh) {
retval = -ENOMEM;
goto fail0;
}
ep->hcpriv = qh;
qh_allocated = true;
}
qtd = kzalloc(sizeof(*qtd), mem_flags);
if (!qtd) {
retval = -ENOMEM;
goto fail1;
}
spin_lock_irqsave(&hsotg->lock, flags);
retval = usb_hcd_link_urb_to_ep(hcd, urb);
if (retval)
goto fail2;
retval = dwc2_hcd_urb_enqueue(hsotg, dwc2_urb, qh, qtd);
if (retval)
goto fail3;
if (alloc_bandwidth) {
dwc2_allocate_bus_bandwidth(hcd,
dwc2_hcd_get_ep_bandwidth(hsotg, ep),
urb);
}
spin_unlock_irqrestore(&hsotg->lock, flags);
return 0;
fail3:
dwc2_urb->priv = NULL;
usb_hcd_unlink_urb_from_ep(hcd, urb);
if (qh_allocated && qh->channel && qh->channel->qh == qh)
qh->channel->qh = NULL;
fail2:
spin_unlock_irqrestore(&hsotg->lock, flags);
urb->hcpriv = NULL;
kfree(qtd);
qtd = NULL;
fail1:
if (qh_allocated) {
struct dwc2_qtd *qtd2, *qtd2_tmp;
ep->hcpriv = NULL;
dwc2_hcd_qh_unlink(hsotg, qh);
/* Free each QTD in the QH's QTD list */
list_for_each_entry_safe(qtd2, qtd2_tmp, &qh->qtd_list,
qtd_list_entry)
dwc2_hcd_qtd_unlink_and_free(hsotg, qtd2, qh);
dwc2_hcd_qh_free(hsotg, qh);
}
fail0:
kfree(dwc2_urb);
return retval;
}
/*
* Aborts/cancels a USB transfer request. Always returns 0 to indicate success.
*/
static int _dwc2_hcd_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
int status)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
int rc;
unsigned long flags;
dev_dbg(hsotg->dev, "DWC OTG HCD URB Dequeue\n");
dwc2_dump_urb_info(hcd, urb, "urb_dequeue");
spin_lock_irqsave(&hsotg->lock, flags);
rc = usb_hcd_check_unlink_urb(hcd, urb, status);
if (rc)
goto out;
if (!urb->hcpriv) {
dev_dbg(hsotg->dev, "## urb->hcpriv is NULL ##\n");
goto out;
}
rc = dwc2_hcd_urb_dequeue(hsotg, urb->hcpriv);
usb_hcd_unlink_urb_from_ep(hcd, urb);
kfree(urb->hcpriv);
urb->hcpriv = NULL;
/* Higher layer software sets URB status */
spin_unlock(&hsotg->lock);
usb_hcd_giveback_urb(hcd, urb, status);
spin_lock(&hsotg->lock);
dev_dbg(hsotg->dev, "Called usb_hcd_giveback_urb()\n");
dev_dbg(hsotg->dev, " urb->status = %d\n", urb->status);
out:
spin_unlock_irqrestore(&hsotg->lock, flags);
return rc;
}
/*
* Frees resources in the DWC_otg controller related to a given endpoint. Also
* clears state in the HCD related to the endpoint. Any URBs for the endpoint
* must already be dequeued.
*/
static void _dwc2_hcd_endpoint_disable(struct usb_hcd *hcd,
struct usb_host_endpoint *ep)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
dev_dbg(hsotg->dev,
"DWC OTG HCD EP DISABLE: bEndpointAddress=0x%02x, ep->hcpriv=%p\n",
ep->desc.bEndpointAddress, ep->hcpriv);
dwc2_hcd_endpoint_disable(hsotg, ep, 250);
}
/*
* Resets endpoint specific parameter values, in current version used to reset
* the data toggle (as a WA). This function can be called from usb_clear_halt
* routine.
*/
static void _dwc2_hcd_endpoint_reset(struct usb_hcd *hcd,
struct usb_host_endpoint *ep)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
unsigned long flags;
dev_dbg(hsotg->dev,
"DWC OTG HCD EP RESET: bEndpointAddress=0x%02x\n",
ep->desc.bEndpointAddress);
spin_lock_irqsave(&hsotg->lock, flags);
dwc2_hcd_endpoint_reset(hsotg, ep);
spin_unlock_irqrestore(&hsotg->lock, flags);
}
/*
* Handles host mode interrupts for the DWC_otg controller. Returns IRQ_NONE if
* there was no interrupt to handle. Returns IRQ_HANDLED if there was a valid
* interrupt.
*
* This function is called by the USB core when an interrupt occurs
*/
static irqreturn_t _dwc2_hcd_irq(struct usb_hcd *hcd)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
return dwc2_handle_hcd_intr(hsotg);
}
/*
* Creates Status Change bitmap for the root hub and root port. The bitmap is
* returned in buf. Bit 0 is the status change indicator for the root hub. Bit 1
* is the status change indicator for the single root port. Returns 1 if either
* change indicator is 1, otherwise returns 0.
*/
static int _dwc2_hcd_hub_status_data(struct usb_hcd *hcd, char *buf)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
buf[0] = dwc2_hcd_is_status_changed(hsotg, 1) << 1;
return buf[0] != 0;
}
/* Handles hub class-specific requests */
static int _dwc2_hcd_hub_control(struct usb_hcd *hcd, u16 typereq, u16 wvalue,
u16 windex, char *buf, u16 wlength)
{
int retval = dwc2_hcd_hub_control(dwc2_hcd_to_hsotg(hcd), typereq,
wvalue, windex, buf, wlength);
return retval;
}
/* Handles hub TT buffer clear completions */
static void _dwc2_hcd_clear_tt_buffer_complete(struct usb_hcd *hcd,
struct usb_host_endpoint *ep)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
struct dwc2_qh *qh;
unsigned long flags;
qh = ep->hcpriv;
if (!qh)
return;
spin_lock_irqsave(&hsotg->lock, flags);
qh->tt_buffer_dirty = 0;
if (hsotg->flags.b.port_connect_status)
dwc2_hcd_queue_transactions(hsotg, DWC2_TRANSACTION_ALL);
spin_unlock_irqrestore(&hsotg->lock, flags);
}
/*
* HPRT0_SPD_HIGH_SPEED: high speed
* HPRT0_SPD_FULL_SPEED: full speed
*/
static void dwc2_change_bus_speed(struct usb_hcd *hcd, int speed)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
if (hsotg->params.speed == speed)
return;
hsotg->params.speed = speed;
queue_work(hsotg->wq_otg, &hsotg->wf_otg);
}
static void dwc2_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
if (!hsotg->params.change_speed_quirk)
return;
/*
* On removal, set speed to default high-speed.
*/
if (udev->parent && udev->parent->speed > USB_SPEED_UNKNOWN &&
udev->parent->speed < USB_SPEED_HIGH) {
dev_info(hsotg->dev, "Set speed to default high-speed\n");
dwc2_change_bus_speed(hcd, HPRT0_SPD_HIGH_SPEED);
}
}
static int dwc2_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
if (!hsotg->params.change_speed_quirk)
return 0;
if (udev->speed == USB_SPEED_HIGH) {
dev_info(hsotg->dev, "Set speed to high-speed\n");
dwc2_change_bus_speed(hcd, HPRT0_SPD_HIGH_SPEED);
} else if ((udev->speed == USB_SPEED_FULL ||
udev->speed == USB_SPEED_LOW)) {
/*
* Change speed setting to full-speed if there's
* a full-speed or low-speed device plugged in.
*/
dev_info(hsotg->dev, "Set speed to full-speed\n");
dwc2_change_bus_speed(hcd, HPRT0_SPD_FULL_SPEED);
}
return 0;
}
static struct hc_driver dwc2_hc_driver = {
.description = "dwc2_hsotg",
.product_desc = "DWC OTG Controller",
.hcd_priv_size = sizeof(struct wrapper_priv_data),
.irq = _dwc2_hcd_irq,
.flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
.start = _dwc2_hcd_start,
.stop = _dwc2_hcd_stop,
.urb_enqueue = _dwc2_hcd_urb_enqueue,
.urb_dequeue = _dwc2_hcd_urb_dequeue,
.endpoint_disable = _dwc2_hcd_endpoint_disable,
.endpoint_reset = _dwc2_hcd_endpoint_reset,
.get_frame_number = _dwc2_hcd_get_frame_number,
.hub_status_data = _dwc2_hcd_hub_status_data,
.hub_control = _dwc2_hcd_hub_control,
.clear_tt_buffer_complete = _dwc2_hcd_clear_tt_buffer_complete,
.bus_suspend = _dwc2_hcd_suspend,
.bus_resume = _dwc2_hcd_resume,
.map_urb_for_dma = dwc2_map_urb_for_dma,
.unmap_urb_for_dma = dwc2_unmap_urb_for_dma,
};
/*
* Frees secondary storage associated with the dwc2_hsotg structure contained
* in the struct usb_hcd field
*/
static void dwc2_hcd_free(struct dwc2_hsotg *hsotg)
{
u32 ahbcfg;
u32 dctl;
int i;
dev_dbg(hsotg->dev, "DWC OTG HCD FREE\n");
/* Free memory for QH/QTD lists */
dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_inactive);
dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_waiting);
dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_active);
dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_inactive);
dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_ready);
dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_assigned);
dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_queued);
/* Free memory for the host channels */
for (i = 0; i < MAX_EPS_CHANNELS; i++) {
struct dwc2_host_chan *chan = hsotg->hc_ptr_array[i];
if (chan) {
dev_dbg(hsotg->dev, "HCD Free channel #%i, chan=%p\n",
i, chan);
hsotg->hc_ptr_array[i] = NULL;
kfree(chan);
}
}
if (hsotg->params.host_dma) {
if (hsotg->status_buf) {
dma_free_coherent(hsotg->dev, DWC2_HCD_STATUS_BUF_SIZE,
hsotg->status_buf,
hsotg->status_buf_dma);
hsotg->status_buf = NULL;
}
} else {
kfree(hsotg->status_buf);
hsotg->status_buf = NULL;
}
ahbcfg = dwc2_readl(hsotg->regs + GAHBCFG);
/* Disable all interrupts */
ahbcfg &= ~GAHBCFG_GLBL_INTR_EN;
dwc2_writel(ahbcfg, hsotg->regs + GAHBCFG);
dwc2_writel(0, hsotg->regs + GINTMSK);
if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a) {
dctl = dwc2_readl(hsotg->regs + DCTL);
dctl |= DCTL_SFTDISCON;
dwc2_writel(dctl, hsotg->regs + DCTL);
}
if (hsotg->wq_otg) {
if (!cancel_work_sync(&hsotg->wf_otg))
flush_workqueue(hsotg->wq_otg);
destroy_workqueue(hsotg->wq_otg);
}
del_timer(&hsotg->wkp_timer);
}
static void dwc2_hcd_release(struct dwc2_hsotg *hsotg)
{
/* Turn off all host-specific interrupts */
dwc2_disable_host_interrupts(hsotg);
dwc2_hcd_free(hsotg);
}
/*
* Initializes the HCD. This function allocates memory for and initializes the
* static parts of the usb_hcd and dwc2_hsotg structures. It also registers the
* USB bus with the core and calls the hc_driver->start() function. It returns
* a negative error on failure.
*/
int dwc2_hcd_init(struct dwc2_hsotg *hsotg)
{
struct platform_device *pdev = to_platform_device(hsotg->dev);
struct resource *res;
struct usb_hcd *hcd;
struct dwc2_host_chan *channel;
u32 hcfg;
int i, num_channels;
int retval;
if (usb_disabled())
return -ENODEV;
dev_dbg(hsotg->dev, "DWC OTG HCD INIT\n");
retval = -ENOMEM;
hcfg = dwc2_readl(hsotg->regs + HCFG);
dev_dbg(hsotg->dev, "hcfg=%08x\n", hcfg);
#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
hsotg->frame_num_array = kcalloc(FRAME_NUM_ARRAY_SIZE,
sizeof(*hsotg->frame_num_array),
GFP_KERNEL);
if (!hsotg->frame_num_array)
goto error1;
hsotg->last_frame_num_array =
kcalloc(FRAME_NUM_ARRAY_SIZE,
sizeof(*hsotg->last_frame_num_array), GFP_KERNEL);
if (!hsotg->last_frame_num_array)
goto error1;
#endif
hsotg->last_frame_num = HFNUM_MAX_FRNUM;
/* Check if the bus driver or platform code has setup a dma_mask */
if (hsotg->params.host_dma &&
!hsotg->dev->dma_mask) {
dev_warn(hsotg->dev,
"dma_mask not set, disabling DMA\n");
hsotg->params.host_dma = false;
hsotg->params.dma_desc_enable = false;
}
/* Set device flags indicating whether the HCD supports DMA */
if (hsotg->params.host_dma) {
if (dma_set_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
dev_warn(hsotg->dev, "can't set DMA mask\n");
if (dma_set_coherent_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
dev_warn(hsotg->dev, "can't set coherent DMA mask\n");
}
if (hsotg->params.change_speed_quirk) {
dwc2_hc_driver.free_dev = dwc2_free_dev;
dwc2_hc_driver.reset_device = dwc2_reset_device;
}
hcd = usb_create_hcd(&dwc2_hc_driver, hsotg->dev, dev_name(hsotg->dev));
if (!hcd)
goto error1;
if (!hsotg->params.host_dma)
hcd->self.uses_dma = 0;
hcd->has_tt = 1;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
((struct wrapper_priv_data *)&hcd->hcd_priv)->hsotg = hsotg;
hsotg->priv = hcd;
/*
* Disable the global interrupt until all the interrupt handlers are
* installed
*/
dwc2_disable_global_interrupts(hsotg);
/* Initialize the DWC_otg core, and select the Phy type */
retval = dwc2_core_init(hsotg, true);
if (retval)
goto error2;
/* Create new workqueue and init work */
retval = -ENOMEM;
hsotg->wq_otg = alloc_ordered_workqueue("dwc2", 0);
if (!hsotg->wq_otg) {
dev_err(hsotg->dev, "Failed to create workqueue\n");
goto error2;
}
INIT_WORK(&hsotg->wf_otg, dwc2_conn_id_status_change);
timer_setup(&hsotg->wkp_timer, dwc2_wakeup_detected, 0);
/* Initialize the non-periodic schedule */
INIT_LIST_HEAD(&hsotg->non_periodic_sched_inactive);
INIT_LIST_HEAD(&hsotg->non_periodic_sched_waiting);
INIT_LIST_HEAD(&hsotg->non_periodic_sched_active);
/* Initialize the periodic schedule */
INIT_LIST_HEAD(&hsotg->periodic_sched_inactive);
INIT_LIST_HEAD(&hsotg->periodic_sched_ready);
INIT_LIST_HEAD(&hsotg->periodic_sched_assigned);
INIT_LIST_HEAD(&hsotg->periodic_sched_queued);
INIT_LIST_HEAD(&hsotg->split_order);
/*
* Create a host channel descriptor for each host channel implemented
* in the controller. Initialize the channel descriptor array.
*/
INIT_LIST_HEAD(&hsotg->free_hc_list);
num_channels = hsotg->params.host_channels;
memset(&hsotg->hc_ptr_array[0], 0, sizeof(hsotg->hc_ptr_array));
for (i = 0; i < num_channels; i++) {
channel = kzalloc(sizeof(*channel), GFP_KERNEL);
if (!channel)
goto error3;
channel->hc_num = i;
INIT_LIST_HEAD(&channel->split_order_list_entry);
hsotg->hc_ptr_array[i] = channel;
}
/* Initialize hsotg start work */
INIT_DELAYED_WORK(&hsotg->start_work, dwc2_hcd_start_func);
/* Initialize port reset work */
INIT_DELAYED_WORK(&hsotg->reset_work, dwc2_hcd_reset_func);
/*
* Allocate space for storing data on status transactions. Normally no
* data is sent, but this space acts as a bit bucket. This must be
* done after usb_add_hcd since that function allocates the DMA buffer
* pool.
*/
if (hsotg->params.host_dma)
hsotg->status_buf = dma_alloc_coherent(hsotg->dev,
DWC2_HCD_STATUS_BUF_SIZE,
&hsotg->status_buf_dma, GFP_KERNEL);
else
hsotg->status_buf = kzalloc(DWC2_HCD_STATUS_BUF_SIZE,
GFP_KERNEL);
if (!hsotg->status_buf)
goto error3;
/*
* Create kmem caches to handle descriptor buffers in descriptor
* DMA mode.
* Alignment must be set to 512 bytes.
*/
if (hsotg->params.dma_desc_enable ||
hsotg->params.dma_desc_fs_enable) {
hsotg->desc_gen_cache = kmem_cache_create("dwc2-gen-desc",
sizeof(struct dwc2_dma_desc) *
MAX_DMA_DESC_NUM_GENERIC, 512, SLAB_CACHE_DMA,
NULL);
if (!hsotg->desc_gen_cache) {
dev_err(hsotg->dev,
"unable to create dwc2 generic desc cache\n");
/*
* Disable descriptor dma mode since it will not be
* usable.
*/
hsotg->params.dma_desc_enable = false;
hsotg->params.dma_desc_fs_enable = false;
}
hsotg->desc_hsisoc_cache = kmem_cache_create("dwc2-hsisoc-desc",
sizeof(struct dwc2_dma_desc) *
MAX_DMA_DESC_NUM_HS_ISOC, 512, 0, NULL);
if (!hsotg->desc_hsisoc_cache) {
dev_err(hsotg->dev,
"unable to create dwc2 hs isoc desc cache\n");
kmem_cache_destroy(hsotg->desc_gen_cache);
/*
* Disable descriptor dma mode since it will not be
* usable.
*/
hsotg->params.dma_desc_enable = false;
hsotg->params.dma_desc_fs_enable = false;
}
}
if (hsotg->params.host_dma) {
/*
* Create kmem caches to handle non-aligned buffer
* in Buffer DMA mode.
*/
hsotg->unaligned_cache = kmem_cache_create("dwc2-unaligned-dma",
DWC2_KMEM_UNALIGNED_BUF_SIZE, 4,
SLAB_CACHE_DMA, NULL);
if (!hsotg->unaligned_cache)
dev_err(hsotg->dev,
"unable to create dwc2 unaligned cache\n");
}
hsotg->otg_port = 1;
hsotg->frame_list = NULL;
hsotg->frame_list_dma = 0;
hsotg->periodic_qh_count = 0;
/* Initiate lx_state to L3 disconnected state */
hsotg->lx_state = DWC2_L3;
hcd->self.otg_port = hsotg->otg_port;
/* Don't support SG list at this point */
hcd->self.sg_tablesize = 0;
if (!IS_ERR_OR_NULL(hsotg->uphy))
otg_set_host(hsotg->uphy->otg, &hcd->self);
/*
* Finish generic HCD initialization and start the HCD. This function
* allocates the DMA buffer pool, registers the USB bus, requests the
* IRQ line, and calls hcd_start method.
*/
retval = usb_add_hcd(hcd, hsotg->irq, IRQF_SHARED);
if (retval < 0)
goto error4;
device_wakeup_enable(hcd->self.controller);
dwc2_hcd_dump_state(hsotg);
dwc2_enable_global_interrupts(hsotg);
return 0;
error4:
kmem_cache_destroy(hsotg->unaligned_cache);
kmem_cache_destroy(hsotg->desc_hsisoc_cache);
kmem_cache_destroy(hsotg->desc_gen_cache);
error3:
dwc2_hcd_release(hsotg);
error2:
usb_put_hcd(hcd);
error1:
#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
kfree(hsotg->last_frame_num_array);
kfree(hsotg->frame_num_array);
#endif
dev_err(hsotg->dev, "%s() FAILED, returning %d\n", __func__, retval);
return retval;
}
/*
* Removes the HCD.
* Frees memory and resources associated with the HCD and deregisters the bus.
*/
void dwc2_hcd_remove(struct dwc2_hsotg *hsotg)
{
struct usb_hcd *hcd;
dev_dbg(hsotg->dev, "DWC OTG HCD REMOVE\n");
hcd = dwc2_hsotg_to_hcd(hsotg);
dev_dbg(hsotg->dev, "hsotg->hcd = %p\n", hcd);
if (!hcd) {
dev_dbg(hsotg->dev, "%s: dwc2_hsotg_to_hcd(hsotg) NULL!\n",
__func__);
return;
}
if (!IS_ERR_OR_NULL(hsotg->uphy))
otg_set_host(hsotg->uphy->otg, NULL);
usb_remove_hcd(hcd);
hsotg->priv = NULL;
kmem_cache_destroy(hsotg->unaligned_cache);
kmem_cache_destroy(hsotg->desc_hsisoc_cache);
kmem_cache_destroy(hsotg->desc_gen_cache);
dwc2_hcd_release(hsotg);
usb_put_hcd(hcd);
#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
kfree(hsotg->last_frame_num_array);
kfree(hsotg->frame_num_array);
#endif
}
/**
* dwc2_backup_host_registers() - Backup controller host registers.
* When suspending usb bus, registers needs to be backuped
* if controller power is disabled once suspended.
*
* @hsotg: Programming view of the DWC_otg controller
*/
int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg)
{
struct dwc2_hregs_backup *hr;
int i;
dev_dbg(hsotg->dev, "%s\n", __func__);
/* Backup Host regs */
hr = &hsotg->hr_backup;
hr->hcfg = dwc2_readl(hsotg->regs + HCFG);
hr->haintmsk = dwc2_readl(hsotg->regs + HAINTMSK);
for (i = 0; i < hsotg->params.host_channels; ++i)
hr->hcintmsk[i] = dwc2_readl(hsotg->regs + HCINTMSK(i));
hr->hprt0 = dwc2_read_hprt0(hsotg);
hr->hfir = dwc2_readl(hsotg->regs + HFIR);
hr->hptxfsiz = dwc2_readl(hsotg->regs + HPTXFSIZ);
hr->valid = true;
return 0;
}
/**
* dwc2_restore_host_registers() - Restore controller host registers.
* When resuming usb bus, device registers needs to be restored
* if controller power were disabled.
*
* @hsotg: Programming view of the DWC_otg controller
*/
int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg)
{
struct dwc2_hregs_backup *hr;
int i;
dev_dbg(hsotg->dev, "%s\n", __func__);
/* Restore host regs */
hr = &hsotg->hr_backup;
if (!hr->valid) {
dev_err(hsotg->dev, "%s: no host registers to restore\n",
__func__);
return -EINVAL;
}
hr->valid = false;
dwc2_writel(hr->hcfg, hsotg->regs + HCFG);
dwc2_writel(hr->haintmsk, hsotg->regs + HAINTMSK);
for (i = 0; i < hsotg->params.host_channels; ++i)
dwc2_writel(hr->hcintmsk[i], hsotg->regs + HCINTMSK(i));
dwc2_writel(hr->hprt0, hsotg->regs + HPRT0);
dwc2_writel(hr->hfir, hsotg->regs + HFIR);
dwc2_writel(hr->hptxfsiz, hsotg->regs + HPTXFSIZ);
hsotg->frame_number = 0;
return 0;
}
/**
* dwc2_host_enter_hibernation() - Put controller in Hibernation.
*
* @hsotg: Programming view of the DWC_otg controller
*/
int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg)
{
unsigned long flags;
int ret = 0;
u32 hprt0;
u32 pcgcctl;
u32 gusbcfg;
u32 gpwrdn;
dev_dbg(hsotg->dev, "Preparing host for hibernation\n");
ret = dwc2_backup_global_registers(hsotg);
if (ret) {
dev_err(hsotg->dev, "%s: failed to backup global registers\n",
__func__);
return ret;
}
ret = dwc2_backup_host_registers(hsotg);
if (ret) {
dev_err(hsotg->dev, "%s: failed to backup host registers\n",
__func__);
return ret;
}
/* Enter USB Suspend Mode */
hprt0 = dwc2_readl(hsotg->regs + HPRT0);
hprt0 |= HPRT0_SUSP;
hprt0 &= ~HPRT0_ENA;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
/* Wait for the HPRT0.PrtSusp register field to be set */
if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 3000))
dev_warn(hsotg->dev, "Suspend wasn't generated\n");
/*
* We need to disable interrupts to prevent servicing of any IRQ
* during going to hibernation
*/
spin_lock_irqsave(&hsotg->lock, flags);
hsotg->lx_state = DWC2_L2;
gusbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
if (gusbcfg & GUSBCFG_ULPI_UTMI_SEL) {
/* ULPI interface */
/* Suspend the Phy Clock */
pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
pcgcctl |= PCGCTL_STOPPCLK;
dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
udelay(10);
gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
gpwrdn |= GPWRDN_PMUACTV;
dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
udelay(10);
} else {
/* UTMI+ Interface */
gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
gpwrdn |= GPWRDN_PMUACTV;
dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
udelay(10);
pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
pcgcctl |= PCGCTL_STOPPCLK;
dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
udelay(10);
}
/* Enable interrupts from wake up logic */
gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
gpwrdn |= GPWRDN_PMUINTSEL;
dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
udelay(10);
/* Unmask host mode interrupts in GPWRDN */
gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
gpwrdn |= GPWRDN_DISCONN_DET_MSK;
gpwrdn |= GPWRDN_LNSTSCHG_MSK;
gpwrdn |= GPWRDN_STS_CHGINT_MSK;
dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
udelay(10);
/* Enable Power Down Clamp */
gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
gpwrdn |= GPWRDN_PWRDNCLMP;
dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
udelay(10);
/* Switch off VDD */
gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
gpwrdn |= GPWRDN_PWRDNSWTCH;
dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
hsotg->hibernated = 1;
hsotg->bus_suspended = 1;
dev_dbg(hsotg->dev, "Host hibernation completed\n");
spin_unlock_irqrestore(&hsotg->lock, flags);
return ret;
}
/*
* dwc2_host_exit_hibernation()
*
* @hsotg: Programming view of the DWC_otg controller
* @rem_wakeup: indicates whether resume is initiated by Device or Host.
* @param reset: indicates whether resume is initiated by Reset.
*
* Return: non-zero if failed to enter to hibernation.
*
* This function is for exiting from Host mode hibernation by
* Host Initiated Resume/Reset and Device Initiated Remote-Wakeup.
*/
int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup,
int reset)
{
u32 gpwrdn;
u32 hprt0;
int ret = 0;
struct dwc2_gregs_backup *gr;
struct dwc2_hregs_backup *hr;
gr = &hsotg->gr_backup;
hr = &hsotg->hr_backup;
dev_dbg(hsotg->dev,
"%s: called with rem_wakeup = %d reset = %d\n",
__func__, rem_wakeup, reset);
dwc2_hib_restore_common(hsotg, rem_wakeup, 1);
hsotg->hibernated = 0;
/*
* This step is not described in functional spec but if not wait for
* this delay, mismatch interrupts occurred because just after restore
* core is in Device mode(gintsts.curmode == 0)
*/
mdelay(100);
/* Clear all pending interupts */
dwc2_writel(0xffffffff, hsotg->regs + GINTSTS);
/* De-assert Restore */
gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
gpwrdn &= ~GPWRDN_RESTORE;
dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
udelay(10);
/* Restore GUSBCFG, HCFG */
dwc2_writel(gr->gusbcfg, hsotg->regs + GUSBCFG);
dwc2_writel(hr->hcfg, hsotg->regs + HCFG);
/* De-assert Wakeup Logic */
gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
gpwrdn &= ~GPWRDN_PMUACTV;
dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
udelay(10);
hprt0 = hr->hprt0;
hprt0 |= HPRT0_PWR;
hprt0 &= ~HPRT0_ENA;
hprt0 &= ~HPRT0_SUSP;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
hprt0 = hr->hprt0;
hprt0 |= HPRT0_PWR;
hprt0 &= ~HPRT0_ENA;
hprt0 &= ~HPRT0_SUSP;
if (reset) {
hprt0 |= HPRT0_RST;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
/* Wait for Resume time and then program HPRT again */
mdelay(60);
hprt0 &= ~HPRT0_RST;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
} else {
hprt0 |= HPRT0_RES;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
/* Wait for Resume time and then program HPRT again */
mdelay(100);
hprt0 &= ~HPRT0_RES;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
}
/* Clear all interrupt status */
hprt0 = dwc2_readl(hsotg->regs + HPRT0);
hprt0 |= HPRT0_CONNDET;
hprt0 |= HPRT0_ENACHG;
hprt0 &= ~HPRT0_ENA;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
hprt0 = dwc2_readl(hsotg->regs + HPRT0);
/* Clear all pending interupts */
dwc2_writel(0xffffffff, hsotg->regs + GINTSTS);
/* Restore global registers */
ret = dwc2_restore_global_registers(hsotg);
if (ret) {
dev_err(hsotg->dev, "%s: failed to restore registers\n",
__func__);
return ret;
}
/* Restore host registers */
ret = dwc2_restore_host_registers(hsotg);
if (ret) {
dev_err(hsotg->dev, "%s: failed to restore host registers\n",
__func__);
return ret;
}
dwc2_hcd_rem_wakeup(hsotg);
hsotg->hibernated = 0;
hsotg->bus_suspended = 0;
hsotg->lx_state = DWC2_L0;
dev_dbg(hsotg->dev, "Host hibernation restore complete\n");
return ret;
}
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