redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity
remarkable-linux/drivers/dma/amba-pl08x.c
Linus Walleij 1e1cfc7213 dmaengine: pl08x: Add support for Faraday Technology FTDMAC020 
After reading the specs for the Faraday Technology FTDMAC020 found
in the Gemini platform, it becomes pretty evident that this is just
another PL08x derivative, and should be handled like such by simply
extending the existing PL08x driver to handle the quirks in this
hardware.

This patch makes memcpy work and has been tested on the Gemini and
also regression-tested on the Nomadik NHK15 using dmatest with
10 threads per channel without a hinch for hours.

I have not implemented slave DMA in those codepaths, because this
device (Gemini) does not use slave DMA, and it seems like devices
using FTDMAC020 for device DMA have a slightly different register
layout so some real hardware is needed to proceed with this. I
left some FIXME etc in the code for this.

I had to do some refactorings of some helper functions, but I have
not split those into separate patches because these refactorings
do not make much sense without the increased complexity of handling
the FTDMAC020.

The DMA test would hang the platform on me on the Gemini after a
few thousand iterations, however after turning of the caches the
problem immediately disappeared and I could run the DMA engine
with 10 threads pers physical channel for days in a row without
a crash. I think there is no problem with the DMA driver: instead
it is something fishy in the FA526 cache handling code that get
pretty heavily exercised by the DMA engine and we need to go and
fix that instead.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2017-05-24 09:44:32 +05:30

3089 lines
81 KiB
C
Raw Blame History

/*
* Copyright (c) 2006 ARM Ltd.
* Copyright (c) 2010 ST-Ericsson SA
* Copyirght (c) 2017 Linaro Ltd.
*
* Author: Peter Pearse <peter.pearse@arm.com>
* Author: Linus Walleij <linus.walleij@linaro.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* The full GNU General Public License is in this distribution in the file
* called COPYING.
*
* Documentation: ARM DDI 0196G == PL080
* Documentation: ARM DDI 0218E == PL081
* Documentation: S3C6410 User's Manual == PL080S
*
* PL080 & PL081 both have 16 sets of DMA signals that can be routed to any
* channel.
*
* The PL080 has 8 channels available for simultaneous use, and the PL081
* has only two channels. So on these DMA controllers the number of channels
* and the number of incoming DMA signals are two totally different things.
* It is usually not possible to theoretically handle all physical signals,
* so a multiplexing scheme with possible denial of use is necessary.
*
* The PL080 has a dual bus master, PL081 has a single master.
*
* PL080S is a version modified by Samsung and used in S3C64xx SoCs.
* It differs in following aspects:
* - CH_CONFIG register at different offset,
* - separate CH_CONTROL2 register for transfer size,
* - bigger maximum transfer size,
* - 8-word aligned LLI, instead of 4-word, due to extra CCTL2 word,
* - no support for peripheral flow control.
*
* Memory to peripheral transfer may be visualized as
* Get data from memory to DMAC
* Until no data left
* On burst request from peripheral
* Destination burst from DMAC to peripheral
* Clear burst request
* Raise terminal count interrupt
*
* For peripherals with a FIFO:
* Source burst size == half the depth of the peripheral FIFO
* Destination burst size == the depth of the peripheral FIFO
*
* (Bursts are irrelevant for mem to mem transfers - there are no burst
* signals, the DMA controller will simply facilitate its AHB master.)
*
* ASSUMES default (little) endianness for DMA transfers
*
* The PL08x has two flow control settings:
* - DMAC flow control: the transfer size defines the number of transfers
* which occur for the current LLI entry, and the DMAC raises TC at the
* end of every LLI entry. Observed behaviour shows the DMAC listening
* to both the BREQ and SREQ signals (contrary to documented),
* transferring data if either is active. The LBREQ and LSREQ signals
* are ignored.
*
* - Peripheral flow control: the transfer size is ignored (and should be
* zero). The data is transferred from the current LLI entry, until
* after the final transfer signalled by LBREQ or LSREQ. The DMAC
* will then move to the next LLI entry. Unsupported by PL080S.
*/
#include <linux/amba/bus.h>
#include <linux/amba/pl08x.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/pm_runtime.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/amba/pl080.h>
#include "dmaengine.h"
#include "virt-dma.h"
#define DRIVER_NAME "pl08xdmac"
#define PL80X_DMA_BUSWIDTHS \
BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)
static struct amba_driver pl08x_amba_driver;
struct pl08x_driver_data;
/**
* struct vendor_data - vendor-specific config parameters for PL08x derivatives
* @config_offset: offset to the configuration register
* @channels: the number of channels available in this variant
* @signals: the number of request signals available from the hardware
* @dualmaster: whether this version supports dual AHB masters or not.
* @nomadik: whether this variant is a ST Microelectronics Nomadik, where the
* channels have Nomadik security extension bits that need to be checked
* for permission before use and some registers are missing
* @pl080s: whether this variant is a Samsung PL080S, which has separate
* register and LLI word for transfer size.
* @ftdmac020: whether this variant is a Faraday Technology FTDMAC020
* @max_transfer_size: the maximum single element transfer size for this
* PL08x variant.
*/
struct vendor_data {
u8 config_offset;
u8 channels;
u8 signals;
bool dualmaster;
bool nomadik;
bool pl080s;
bool ftdmac020;
u32 max_transfer_size;
};
/**
* struct pl08x_bus_data - information of source or destination
* busses for a transfer
* @addr: current address
* @maxwidth: the maximum width of a transfer on this bus
* @buswidth: the width of this bus in bytes: 1, 2 or 4
*/
struct pl08x_bus_data {
dma_addr_t addr;
u8 maxwidth;
u8 buswidth;
};
#define IS_BUS_ALIGNED(bus) IS_ALIGNED((bus)->addr, (bus)->buswidth)
/**
* struct pl08x_phy_chan - holder for the physical channels
* @id: physical index to this channel
* @base: memory base address for this physical channel
* @reg_config: configuration address for this physical channel
* @reg_control: control address for this physical channel
* @reg_src: transfer source address register
* @reg_dst: transfer destination address register
* @reg_lli: transfer LLI address register
* @reg_busy: if the variant has a special per-channel busy register,
* this contains a pointer to it
* @lock: a lock to use when altering an instance of this struct
* @serving: the virtual channel currently being served by this physical
* channel
* @locked: channel unavailable for the system, e.g. dedicated to secure
* world
* @ftdmac020: channel is on a FTDMAC020
* @pl080s: channel is on a PL08s
*/
struct pl08x_phy_chan {
unsigned int id;
void __iomem *base;
void __iomem *reg_config;
void __iomem *reg_control;
void __iomem *reg_src;
void __iomem *reg_dst;
void __iomem *reg_lli;
void __iomem *reg_busy;
spinlock_t lock;
struct pl08x_dma_chan *serving;
bool locked;
bool ftdmac020;
bool pl080s;
};
/**
* struct pl08x_sg - structure containing data per sg
* @src_addr: src address of sg
* @dst_addr: dst address of sg
* @len: transfer len in bytes
* @node: node for txd's dsg_list
*/
struct pl08x_sg {
dma_addr_t src_addr;
dma_addr_t dst_addr;
size_t len;
struct list_head node;
};
/**
* struct pl08x_txd - wrapper for struct dma_async_tx_descriptor
* @vd: virtual DMA descriptor
* @dsg_list: list of children sg's
* @llis_bus: DMA memory address (physical) start for the LLIs
* @llis_va: virtual memory address start for the LLIs
* @cctl: control reg values for current txd
* @ccfg: config reg values for current txd
* @done: this marks completed descriptors, which should not have their
* mux released.
* @cyclic: indicate cyclic transfers
*/
struct pl08x_txd {
struct virt_dma_desc vd;
struct list_head dsg_list;
dma_addr_t llis_bus;
u32 *llis_va;
/* Default cctl value for LLIs */
u32 cctl;
/*
* Settings to be put into the physical channel when we
* trigger this txd. Other registers are in llis_va[0].
*/
u32 ccfg;
bool done;
bool cyclic;
};
/**
* enum pl08x_dma_chan_state - holds the PL08x specific virtual channel
* states
* @PL08X_CHAN_IDLE: the channel is idle
* @PL08X_CHAN_RUNNING: the channel has allocated a physical transport
* channel and is running a transfer on it
* @PL08X_CHAN_PAUSED: the channel has allocated a physical transport
* channel, but the transfer is currently paused
* @PL08X_CHAN_WAITING: the channel is waiting for a physical transport
* channel to become available (only pertains to memcpy channels)
*/
enum pl08x_dma_chan_state {
PL08X_CHAN_IDLE,
PL08X_CHAN_RUNNING,
PL08X_CHAN_PAUSED,
PL08X_CHAN_WAITING,
};
/**
* struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel
* @vc: wrappped virtual channel
* @phychan: the physical channel utilized by this channel, if there is one
* @name: name of channel
* @cd: channel platform data
* @cfg: slave configuration
* @at: active transaction on this channel
* @host: a pointer to the host (internal use)
* @state: whether the channel is idle, paused, running etc
* @slave: whether this channel is a device (slave) or for memcpy
* @signal: the physical DMA request signal which this channel is using
* @mux_use: count of descriptors using this DMA request signal setting
*/
struct pl08x_dma_chan {
struct virt_dma_chan vc;
struct pl08x_phy_chan *phychan;
const char *name;
struct pl08x_channel_data *cd;
struct dma_slave_config cfg;
struct pl08x_txd *at;
struct pl08x_driver_data *host;
enum pl08x_dma_chan_state state;
bool slave;
int signal;
unsigned mux_use;
};
/**
* struct pl08x_driver_data - the local state holder for the PL08x
* @slave: optional slave engine for this instance
* @memcpy: memcpy engine for this instance
* @has_slave: the PL08x has a slave engine (routed signals)
* @base: virtual memory base (remapped) for the PL08x
* @adev: the corresponding AMBA (PrimeCell) bus entry
* @vd: vendor data for this PL08x variant
* @pd: platform data passed in from the platform/machine
* @phy_chans: array of data for the physical channels
* @pool: a pool for the LLI descriptors
* @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI
* fetches
* @mem_buses: set to indicate memory transfers on AHB2.
* @lli_words: how many words are used in each LLI item for this variant
*/
struct pl08x_driver_data {
struct dma_device slave;
struct dma_device memcpy;
bool has_slave;
void __iomem *base;
struct amba_device *adev;
const struct vendor_data *vd;
struct pl08x_platform_data *pd;
struct pl08x_phy_chan *phy_chans;
struct dma_pool *pool;
u8 lli_buses;
u8 mem_buses;
u8 lli_words;
};
/*
* PL08X specific defines
*/
/* The order of words in an LLI. */
#define PL080_LLI_SRC 0
#define PL080_LLI_DST 1
#define PL080_LLI_LLI 2
#define PL080_LLI_CCTL 3
#define PL080S_LLI_CCTL2 4
/* Total words in an LLI. */
#define PL080_LLI_WORDS 4
#define PL080S_LLI_WORDS 8
/*
* Number of LLIs in each LLI buffer allocated for one transfer
* (maximum times we call dma_pool_alloc on this pool without freeing)
*/
#define MAX_NUM_TSFR_LLIS 512
#define PL08X_ALIGN 8
static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan)
{
return container_of(chan, struct pl08x_dma_chan, vc.chan);
}
static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct pl08x_txd, vd.tx);
}
/*
* Mux handling.
*
* This gives us the DMA request input to the PL08x primecell which the
* peripheral described by the channel data will be routed to, possibly
* via a board/SoC specific external MUX. One important point to note
* here is that this does not depend on the physical channel.
*/
static int pl08x_request_mux(struct pl08x_dma_chan *plchan)
{
const struct pl08x_platform_data *pd = plchan->host->pd;
int ret;
if (plchan->mux_use++ == 0 && pd->get_xfer_signal) {
ret = pd->get_xfer_signal(plchan->cd);
if (ret < 0) {
plchan->mux_use = 0;
return ret;
}
plchan->signal = ret;
}
return 0;
}
static void pl08x_release_mux(struct pl08x_dma_chan *plchan)
{
const struct pl08x_platform_data *pd = plchan->host->pd;
if (plchan->signal >= 0) {
WARN_ON(plchan->mux_use == 0);
if (--plchan->mux_use == 0 && pd->put_xfer_signal) {
pd->put_xfer_signal(plchan->cd, plchan->signal);
plchan->signal = -1;
}
}
}
/*
* Physical channel handling
*/
/* Whether a certain channel is busy or not */
static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch)
{
unsigned int val;
/* If we have a special busy register, take a shortcut */
if (ch->reg_busy) {
val = readl(ch->reg_busy);
return !!(val & BIT(ch->id));
}
val = readl(ch->reg_config);
return val & PL080_CONFIG_ACTIVE;
}
/*
* pl08x_write_lli() - Write an LLI into the DMA controller.
*
* The PL08x derivatives support linked lists, but the first item of the
* list containing the source, destination, control word and next LLI is
* ignored. Instead the driver has to write those values directly into the
* SRC, DST, LLI and control registers. On FTDMAC020 also the SIZE
* register need to be set up for the first transfer.
*/
static void pl08x_write_lli(struct pl08x_driver_data *pl08x,
struct pl08x_phy_chan *phychan, const u32 *lli, u32 ccfg)
{
if (pl08x->vd->pl080s)
dev_vdbg(&pl08x->adev->dev,
"WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
"clli=0x%08x, cctl=0x%08x, cctl2=0x%08x, ccfg=0x%08x\n",
phychan->id, lli[PL080_LLI_SRC], lli[PL080_LLI_DST],
lli[PL080_LLI_LLI], lli[PL080_LLI_CCTL],
lli[PL080S_LLI_CCTL2], ccfg);
else
dev_vdbg(&pl08x->adev->dev,
"WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
"clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n",
phychan->id, lli[PL080_LLI_SRC], lli[PL080_LLI_DST],
lli[PL080_LLI_LLI], lli[PL080_LLI_CCTL], ccfg);
writel_relaxed(lli[PL080_LLI_SRC], phychan->reg_src);
writel_relaxed(lli[PL080_LLI_DST], phychan->reg_dst);
writel_relaxed(lli[PL080_LLI_LLI], phychan->reg_lli);
/*
* The FTMAC020 has a different layout in the CCTL word of the LLI
* and the CCTL register which is split in CSR and SIZE registers.
* Convert the LLI item CCTL into the proper values to write into
* the CSR and SIZE registers.
*/
if (phychan->ftdmac020) {
u32 llictl = lli[PL080_LLI_CCTL];
u32 val = 0;
/* Write the transfer size (12 bits) to the size register */
writel_relaxed(llictl & FTDMAC020_LLI_TRANSFER_SIZE_MASK,
phychan->base + FTDMAC020_CH_SIZE);
/*
* Then write the control bits 28..16 to the control register
* by shuffleing the bits around to where they are in the
* main register. The mapping is as follows:
* Bit 28: TC_MSK - mask on all except last LLI
* Bit 27..25: SRC_WIDTH
* Bit 24..22: DST_WIDTH
* Bit 21..20: SRCAD_CTRL
* Bit 19..17: DSTAD_CTRL
* Bit 17: SRC_SEL
* Bit 16: DST_SEL
*/
if (llictl & FTDMAC020_LLI_TC_MSK)
val |= FTDMAC020_CH_CSR_TC_MSK;
val |= ((llictl & FTDMAC020_LLI_SRC_WIDTH_MSK) >>
(FTDMAC020_LLI_SRC_WIDTH_SHIFT -
FTDMAC020_CH_CSR_SRC_WIDTH_SHIFT));
val |= ((llictl & FTDMAC020_LLI_DST_WIDTH_MSK) >>
(FTDMAC020_LLI_DST_WIDTH_SHIFT -
FTDMAC020_CH_CSR_DST_WIDTH_SHIFT));
val |= ((llictl & FTDMAC020_LLI_SRCAD_CTL_MSK) >>
(FTDMAC020_LLI_SRCAD_CTL_SHIFT -
FTDMAC020_CH_CSR_SRCAD_CTL_SHIFT));
val |= ((llictl & FTDMAC020_LLI_DSTAD_CTL_MSK) >>
(FTDMAC020_LLI_DSTAD_CTL_SHIFT -
FTDMAC020_CH_CSR_DSTAD_CTL_SHIFT));
if (llictl & FTDMAC020_LLI_SRC_SEL)
val |= FTDMAC020_CH_CSR_SRC_SEL;
if (llictl & FTDMAC020_LLI_DST_SEL)
val |= FTDMAC020_CH_CSR_DST_SEL;
/*
* Set up the bits that exist in the CSR but are not
* part the LLI, i.e. only gets written to the control
* register right here.
*
* FIXME: do not just handle memcpy, also handle slave DMA.
*/
switch (pl08x->pd->memcpy_burst_size) {
default:
case PL08X_BURST_SZ_1:
val |= PL080_BSIZE_1 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_4:
val |= PL080_BSIZE_4 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_8:
val |= PL080_BSIZE_8 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_16:
val |= PL080_BSIZE_16 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_32:
val |= PL080_BSIZE_32 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_64:
val |= PL080_BSIZE_64 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_128:
val |= PL080_BSIZE_128 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_256:
val |= PL080_BSIZE_256 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
}
/* Protection flags */
if (pl08x->pd->memcpy_prot_buff)
val |= FTDMAC020_CH_CSR_PROT2;
if (pl08x->pd->memcpy_prot_cache)
val |= FTDMAC020_CH_CSR_PROT3;
/* We are the kernel, so we are in privileged mode */
val |= FTDMAC020_CH_CSR_PROT1;
writel_relaxed(val, phychan->reg_control);
} else {
/* Bits are just identical */
writel_relaxed(lli[PL080_LLI_CCTL], phychan->reg_control);
}
/* Second control word on the PL080s */
if (pl08x->vd->pl080s)
writel_relaxed(lli[PL080S_LLI_CCTL2],
phychan->base + PL080S_CH_CONTROL2);
writel(ccfg, phychan->reg_config);
}
/*
* Set the initial DMA register values i.e. those for the first LLI
* The next LLI pointer and the configuration interrupt bit have
* been set when the LLIs were constructed. Poke them into the hardware
* and start the transfer.
*/
static void pl08x_start_next_txd(struct pl08x_dma_chan *plchan)
{
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_phy_chan *phychan = plchan->phychan;
struct virt_dma_desc *vd = vchan_next_desc(&plchan->vc);
struct pl08x_txd *txd = to_pl08x_txd(&vd->tx);
u32 val;
list_del(&txd->vd.node);
plchan->at = txd;
/* Wait for channel inactive */
while (pl08x_phy_channel_busy(phychan))
cpu_relax();
pl08x_write_lli(pl08x, phychan, &txd->llis_va[0], txd->ccfg);
/* Enable the DMA channel */
/* Do not access config register until channel shows as disabled */
while (readl(pl08x->base + PL080_EN_CHAN) & BIT(phychan->id))
cpu_relax();
/* Do not access config register until channel shows as inactive */
if (phychan->ftdmac020) {
val = readl(phychan->reg_config);
while (val & FTDMAC020_CH_CFG_BUSY)
val = readl(phychan->reg_config);
val = readl(phychan->reg_control);
while (val & FTDMAC020_CH_CSR_EN)
val = readl(phychan->reg_control);
writel(val | FTDMAC020_CH_CSR_EN,
phychan->reg_control);
} else {
val = readl(phychan->reg_config);
while ((val & PL080_CONFIG_ACTIVE) ||
(val & PL080_CONFIG_ENABLE))
val = readl(phychan->reg_config);
writel(val | PL080_CONFIG_ENABLE, phychan->reg_config);
}
}
/*
* Pause the channel by setting the HALT bit.
*
* For M->P transfers, pause the DMAC first and then stop the peripheral -
* the FIFO can only drain if the peripheral is still requesting data.
* (note: this can still timeout if the DMAC FIFO never drains of data.)
*
* For P->M transfers, disable the peripheral first to stop it filling
* the DMAC FIFO, and then pause the DMAC.
*/
static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch)
{
u32 val;
int timeout;
if (ch->ftdmac020) {
/* Use the enable bit on the FTDMAC020 */
val = readl(ch->reg_control);
val &= ~FTDMAC020_CH_CSR_EN;
writel(val, ch->reg_control);
return;
}
/* Set the HALT bit and wait for the FIFO to drain */
val = readl(ch->reg_config);
val |= PL080_CONFIG_HALT;
writel(val, ch->reg_config);
/* Wait for channel inactive */
for (timeout = 1000; timeout; timeout--) {
if (!pl08x_phy_channel_busy(ch))
break;
udelay(1);
}
if (pl08x_phy_channel_busy(ch))
pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id);
}
static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch)
{
u32 val;
/* Use the enable bit on the FTDMAC020 */
if (ch->ftdmac020) {
val = readl(ch->reg_control);
val |= FTDMAC020_CH_CSR_EN;
writel(val, ch->reg_control);
return;
}
/* Clear the HALT bit */
val = readl(ch->reg_config);
val &= ~PL080_CONFIG_HALT;
writel(val, ch->reg_config);
}
/*
* pl08x_terminate_phy_chan() stops the channel, clears the FIFO and
* clears any pending interrupt status. This should not be used for
* an on-going transfer, but as a method of shutting down a channel
* (eg, when it's no longer used) or terminating a transfer.
*/
static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x,
struct pl08x_phy_chan *ch)
{
u32 val;
/* The layout for the FTDMAC020 is different */
if (ch->ftdmac020) {
/* Disable all interrupts */
val = readl(ch->reg_config);
val |= (FTDMAC020_CH_CFG_INT_ABT_MASK |
FTDMAC020_CH_CFG_INT_ERR_MASK |
FTDMAC020_CH_CFG_INT_TC_MASK);
writel(val, ch->reg_config);
/* Abort and disable channel */
val = readl(ch->reg_control);
val &= ~FTDMAC020_CH_CSR_EN;
val |= FTDMAC020_CH_CSR_ABT;
writel(val, ch->reg_control);
/* Clear ABT and ERR interrupt flags */
writel(BIT(ch->id) | BIT(ch->id + 16),
pl08x->base + PL080_ERR_CLEAR);
writel(BIT(ch->id), pl08x->base + PL080_TC_CLEAR);
return;
}
val = readl(ch->reg_config);
val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK |
PL080_CONFIG_TC_IRQ_MASK);
writel(val, ch->reg_config);
writel(BIT(ch->id), pl08x->base + PL080_ERR_CLEAR);
writel(BIT(ch->id), pl08x->base + PL080_TC_CLEAR);
}
static u32 get_bytes_in_phy_channel(struct pl08x_phy_chan *ch)
{
u32 val;
u32 bytes;
if (ch->ftdmac020) {
bytes = readl(ch->base + FTDMAC020_CH_SIZE);
val = readl(ch->reg_control);
val &= FTDMAC020_CH_CSR_SRC_WIDTH_MSK;
val >>= FTDMAC020_CH_CSR_SRC_WIDTH_SHIFT;
} else if (ch->pl080s) {
val = readl(ch->base + PL080S_CH_CONTROL2);
bytes = val & PL080S_CONTROL_TRANSFER_SIZE_MASK;
val = readl(ch->reg_control);
val &= PL080_CONTROL_SWIDTH_MASK;
val >>= PL080_CONTROL_SWIDTH_SHIFT;
} else {
/* Plain PL08x */
val = readl(ch->reg_control);
bytes = val & PL080_CONTROL_TRANSFER_SIZE_MASK;
val &= PL080_CONTROL_SWIDTH_MASK;
val >>= PL080_CONTROL_SWIDTH_SHIFT;
}
switch (val) {
case PL080_WIDTH_8BIT:
break;
case PL080_WIDTH_16BIT:
bytes *= 2;
break;
case PL080_WIDTH_32BIT:
bytes *= 4;
break;
}
return bytes;
}
static u32 get_bytes_in_lli(struct pl08x_phy_chan *ch, const u32 *llis_va)
{
u32 val;
u32 bytes;
if (ch->ftdmac020) {
val = llis_va[PL080_LLI_CCTL];
bytes = val & FTDMAC020_LLI_TRANSFER_SIZE_MASK;
val = llis_va[PL080_LLI_CCTL];
val &= FTDMAC020_LLI_SRC_WIDTH_MSK;
val >>= FTDMAC020_LLI_SRC_WIDTH_SHIFT;
} else if (ch->pl080s) {
val = llis_va[PL080S_LLI_CCTL2];
bytes = val & PL080S_CONTROL_TRANSFER_SIZE_MASK;
val = llis_va[PL080_LLI_CCTL];
val &= PL080_CONTROL_SWIDTH_MASK;
val >>= PL080_CONTROL_SWIDTH_SHIFT;
} else {
/* Plain PL08x */
val = llis_va[PL080_LLI_CCTL];
bytes = val & PL080_CONTROL_TRANSFER_SIZE_MASK;
val &= PL080_CONTROL_SWIDTH_MASK;
val >>= PL080_CONTROL_SWIDTH_SHIFT;
}
switch (val) {
case PL080_WIDTH_8BIT:
break;
case PL080_WIDTH_16BIT:
bytes *= 2;
break;
case PL080_WIDTH_32BIT:
bytes *= 4;
break;
}
return bytes;
}
/* The channel should be paused when calling this */
static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
{
struct pl08x_driver_data *pl08x = plchan->host;
const u32 *llis_va, *llis_va_limit;
struct pl08x_phy_chan *ch;
dma_addr_t llis_bus;
struct pl08x_txd *txd;
u32 llis_max_words;
size_t bytes;
u32 clli;
ch = plchan->phychan;
txd = plchan->at;
if (!ch || !txd)
return 0;
/*
* Follow the LLIs to get the number of remaining
* bytes in the currently active transaction.
*/
clli = readl(ch->reg_lli) & ~PL080_LLI_LM_AHB2;
/* First get the remaining bytes in the active transfer */
bytes = get_bytes_in_phy_channel(ch);
if (!clli)
return bytes;
llis_va = txd->llis_va;
llis_bus = txd->llis_bus;
llis_max_words = pl08x->lli_words * MAX_NUM_TSFR_LLIS;
BUG_ON(clli < llis_bus || clli >= llis_bus +
sizeof(u32) * llis_max_words);
/*
* Locate the next LLI - as this is an array,
* it's simple maths to find.
*/
llis_va += (clli - llis_bus) / sizeof(u32);
llis_va_limit = llis_va + llis_max_words;
for (; llis_va < llis_va_limit; llis_va += pl08x->lli_words) {
bytes += get_bytes_in_lli(ch, llis_va);
/*
* A LLI pointer going backward terminates the LLI list
*/
if (llis_va[PL080_LLI_LLI] <= clli)
break;
}
return bytes;
}
/*
* Allocate a physical channel for a virtual channel
*
* Try to locate a physical channel to be used for this transfer. If all
* are taken return NULL and the requester will have to cope by using
* some fallback PIO mode or retrying later.
*/
static struct pl08x_phy_chan *
pl08x_get_phy_channel(struct pl08x_driver_data *pl08x,
struct pl08x_dma_chan *virt_chan)
{
struct pl08x_phy_chan *ch = NULL;
unsigned long flags;
int i;
for (i = 0; i < pl08x->vd->channels; i++) {
ch = &pl08x->phy_chans[i];
spin_lock_irqsave(&ch->lock, flags);
if (!ch->locked && !ch->serving) {
ch->serving = virt_chan;
spin_unlock_irqrestore(&ch->lock, flags);
break;
}
spin_unlock_irqrestore(&ch->lock, flags);
}
if (i == pl08x->vd->channels) {
/* No physical channel available, cope with it */
return NULL;
}
return ch;
}
/* Mark the physical channel as free. Note, this write is atomic. */
static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x,
struct pl08x_phy_chan *ch)
{
ch->serving = NULL;
}
/*
* Try to allocate a physical channel. When successful, assign it to
* this virtual channel, and initiate the next descriptor. The
* virtual channel lock must be held at this point.
*/
static void pl08x_phy_alloc_and_start(struct pl08x_dma_chan *plchan)
{
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_phy_chan *ch;
ch = pl08x_get_phy_channel(pl08x, plchan);
if (!ch) {
dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name);
plchan->state = PL08X_CHAN_WAITING;
return;
}
dev_dbg(&pl08x->adev->dev, "allocated physical channel %d for xfer on %s\n",
ch->id, plchan->name);
plchan->phychan = ch;
plchan->state = PL08X_CHAN_RUNNING;
pl08x_start_next_txd(plchan);
}
static void pl08x_phy_reassign_start(struct pl08x_phy_chan *ch,
struct pl08x_dma_chan *plchan)
{
struct pl08x_driver_data *pl08x = plchan->host;
dev_dbg(&pl08x->adev->dev, "reassigned physical channel %d for xfer on %s\n",
ch->id, plchan->name);
/*
* We do this without taking the lock; we're really only concerned
* about whether this pointer is NULL or not, and we're guaranteed
* that this will only be called when it _already_ is non-NULL.
*/
ch->serving = plchan;
plchan->phychan = ch;
plchan->state = PL08X_CHAN_RUNNING;
pl08x_start_next_txd(plchan);
}
/*
* Free a physical DMA channel, potentially reallocating it to another
* virtual channel if we have any pending.
*/
static void pl08x_phy_free(struct pl08x_dma_chan *plchan)
{
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_dma_chan *p, *next;
retry:
next = NULL;
/* Find a waiting virtual channel for the next transfer. */
list_for_each_entry(p, &pl08x->memcpy.channels, vc.chan.device_node)
if (p->state == PL08X_CHAN_WAITING) {
next = p;
break;
}
if (!next && pl08x->has_slave) {
list_for_each_entry(p, &pl08x->slave.channels, vc.chan.device_node)
if (p->state == PL08X_CHAN_WAITING) {
next = p;
break;
}
}
/* Ensure that the physical channel is stopped */
pl08x_terminate_phy_chan(pl08x, plchan->phychan);
if (next) {
bool success;
/*
* Eww. We know this isn't going to deadlock
* but lockdep probably doesn't.
*/
spin_lock(&next->vc.lock);
/* Re-check the state now that we have the lock */
success = next->state == PL08X_CHAN_WAITING;
if (success)
pl08x_phy_reassign_start(plchan->phychan, next);
spin_unlock(&next->vc.lock);
/* If the state changed, try to find another channel */
if (!success)
goto retry;
} else {
/* No more jobs, so free up the physical channel */
pl08x_put_phy_channel(pl08x, plchan->phychan);
}
plchan->phychan = NULL;
plchan->state = PL08X_CHAN_IDLE;
}
/*
* LLI handling
*/
static inline unsigned int
pl08x_get_bytes_for_lli(struct pl08x_driver_data *pl08x,
u32 cctl,
bool source)
{
u32 val;
if (pl08x->vd->ftdmac020) {
if (source)
val = (cctl & FTDMAC020_LLI_SRC_WIDTH_MSK) >>
FTDMAC020_LLI_SRC_WIDTH_SHIFT;
else
val = (cctl & FTDMAC020_LLI_DST_WIDTH_MSK) >>
FTDMAC020_LLI_DST_WIDTH_SHIFT;
} else {
if (source)
val = (cctl & PL080_CONTROL_SWIDTH_MASK) >>
PL080_CONTROL_SWIDTH_SHIFT;
else
val = (cctl & PL080_CONTROL_DWIDTH_MASK) >>
PL080_CONTROL_DWIDTH_SHIFT;
}
switch (val) {
case PL080_WIDTH_8BIT:
return 1;
case PL080_WIDTH_16BIT:
return 2;
case PL080_WIDTH_32BIT:
return 4;
default:
break;
}
BUG();
return 0;
}
static inline u32 pl08x_lli_control_bits(struct pl08x_driver_data *pl08x,
u32 cctl,
u8 srcwidth, u8 dstwidth,
size_t tsize)
{
u32 retbits = cctl;
/*
* Remove all src, dst and transfer size bits, then set the
* width and size according to the parameters. The bit offsets
* are different in the FTDMAC020 so we need to accound for this.
*/
if (pl08x->vd->ftdmac020) {
retbits &= ~FTDMAC020_LLI_DST_WIDTH_MSK;
retbits &= ~FTDMAC020_LLI_SRC_WIDTH_MSK;
retbits &= ~FTDMAC020_LLI_TRANSFER_SIZE_MASK;
switch (srcwidth) {
case 1:
retbits |= PL080_WIDTH_8BIT <<
FTDMAC020_LLI_SRC_WIDTH_SHIFT;
break;
case 2:
retbits |= PL080_WIDTH_16BIT <<
FTDMAC020_LLI_SRC_WIDTH_SHIFT;
break;
case 4:
retbits |= PL080_WIDTH_32BIT <<
FTDMAC020_LLI_SRC_WIDTH_SHIFT;
break;
default:
BUG();
break;
}
switch (dstwidth) {
case 1:
retbits |= PL080_WIDTH_8BIT <<
FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
case 2:
retbits |= PL080_WIDTH_16BIT <<
FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
case 4:
retbits |= PL080_WIDTH_32BIT <<
FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
default:
BUG();
break;
}
tsize &= FTDMAC020_LLI_TRANSFER_SIZE_MASK;
retbits |= tsize << FTDMAC020_LLI_TRANSFER_SIZE_SHIFT;
} else {
retbits &= ~PL080_CONTROL_DWIDTH_MASK;
retbits &= ~PL080_CONTROL_SWIDTH_MASK;
retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK;
switch (srcwidth) {
case 1:
retbits |= PL080_WIDTH_8BIT <<
PL080_CONTROL_SWIDTH_SHIFT;
break;
case 2:
retbits |= PL080_WIDTH_16BIT <<
PL080_CONTROL_SWIDTH_SHIFT;
break;
case 4:
retbits |= PL080_WIDTH_32BIT <<
PL080_CONTROL_SWIDTH_SHIFT;
break;
default:
BUG();
break;
}
switch (dstwidth) {
case 1:
retbits |= PL080_WIDTH_8BIT <<
PL080_CONTROL_DWIDTH_SHIFT;
break;
case 2:
retbits |= PL080_WIDTH_16BIT <<
PL080_CONTROL_DWIDTH_SHIFT;
break;
case 4:
retbits |= PL080_WIDTH_32BIT <<
PL080_CONTROL_DWIDTH_SHIFT;
break;
default:
BUG();
break;
}
tsize &= PL080_CONTROL_TRANSFER_SIZE_MASK;
retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT;
}
return retbits;
}
struct pl08x_lli_build_data {
struct pl08x_txd *txd;
struct pl08x_bus_data srcbus;
struct pl08x_bus_data dstbus;
size_t remainder;
u32 lli_bus;
};
/*
* Autoselect a master bus to use for the transfer. Slave will be the chosen as
* victim in case src & dest are not similarly aligned. i.e. If after aligning
* masters address with width requirements of transfer (by sending few byte by
* byte data), slave is still not aligned, then its width will be reduced to
* BYTE.
* - prefers the destination bus if both available
* - prefers bus with fixed address (i.e. peripheral)
*/
static void pl08x_choose_master_bus(struct pl08x_driver_data *pl08x,
struct pl08x_lli_build_data *bd,
struct pl08x_bus_data **mbus,
struct pl08x_bus_data **sbus,
u32 cctl)
{
bool dst_incr;
bool src_incr;
/*
* The FTDMAC020 only supports memory-to-memory transfer, so
* source and destination always increase.
*/
if (pl08x->vd->ftdmac020) {
dst_incr = true;
src_incr = true;
} else {
dst_incr = !!(cctl & PL080_CONTROL_DST_INCR);
src_incr = !!(cctl & PL080_CONTROL_SRC_INCR);
}
/*
* If either bus is not advancing, i.e. it is a peripheral, that
* one becomes master
*/
if (!dst_incr) {
*mbus = &bd->dstbus;
*sbus = &bd->srcbus;
} else if (!src_incr) {
*mbus = &bd->srcbus;
*sbus = &bd->dstbus;
} else {
if (bd->dstbus.buswidth >= bd->srcbus.buswidth) {
*mbus = &bd->dstbus;
*sbus = &bd->srcbus;
} else {
*mbus = &bd->srcbus;
*sbus = &bd->dstbus;
}
}
}
/*
* Fills in one LLI for a certain transfer descriptor and advance the counter
*/
static void pl08x_fill_lli_for_desc(struct pl08x_driver_data *pl08x,
struct pl08x_lli_build_data *bd,
int num_llis, int len, u32 cctl, u32 cctl2)
{
u32 offset = num_llis * pl08x->lli_words;
u32 *llis_va = bd->txd->llis_va + offset;
dma_addr_t llis_bus = bd->txd->llis_bus;
BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS);
/* Advance the offset to next LLI. */
offset += pl08x->lli_words;
llis_va[PL080_LLI_SRC] = bd->srcbus.addr;
llis_va[PL080_LLI_DST] = bd->dstbus.addr;
llis_va[PL080_LLI_LLI] = (llis_bus + sizeof(u32) * offset);
llis_va[PL080_LLI_LLI] |= bd->lli_bus;
llis_va[PL080_LLI_CCTL] = cctl;
if (pl08x->vd->pl080s)
llis_va[PL080S_LLI_CCTL2] = cctl2;
if (pl08x->vd->ftdmac020) {
/* FIXME: only memcpy so far so both increase */
bd->srcbus.addr += len;
bd->dstbus.addr += len;
} else {
if (cctl & PL080_CONTROL_SRC_INCR)
bd->srcbus.addr += len;
if (cctl & PL080_CONTROL_DST_INCR)
bd->dstbus.addr += len;
}
BUG_ON(bd->remainder < len);
bd->remainder -= len;
}
static inline void prep_byte_width_lli(struct pl08x_driver_data *pl08x,
struct pl08x_lli_build_data *bd, u32 *cctl, u32 len,
int num_llis, size_t *total_bytes)
{
*cctl = pl08x_lli_control_bits(pl08x, *cctl, 1, 1, len);
pl08x_fill_lli_for_desc(pl08x, bd, num_llis, len, *cctl, len);
(*total_bytes) += len;
}
#if 1
static void pl08x_dump_lli(struct pl08x_driver_data *pl08x,
const u32 *llis_va, int num_llis)
{
int i;
if (pl08x->vd->pl080s) {
dev_vdbg(&pl08x->adev->dev,
"%-3s %-9s %-10s %-10s %-10s %-10s %s\n",
"lli", "", "csrc", "cdst", "clli", "cctl", "cctl2");
for (i = 0; i < num_llis; i++) {
dev_vdbg(&pl08x->adev->dev,
"%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
i, llis_va, llis_va[PL080_LLI_SRC],
llis_va[PL080_LLI_DST], llis_va[PL080_LLI_LLI],
llis_va[PL080_LLI_CCTL],
llis_va[PL080S_LLI_CCTL2]);
llis_va += pl08x->lli_words;
}
} else {
dev_vdbg(&pl08x->adev->dev,
"%-3s %-9s %-10s %-10s %-10s %s\n",
"lli", "", "csrc", "cdst", "clli", "cctl");
for (i = 0; i < num_llis; i++) {
dev_vdbg(&pl08x->adev->dev,
"%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n",
i, llis_va, llis_va[PL080_LLI_SRC],
llis_va[PL080_LLI_DST], llis_va[PL080_LLI_LLI],
llis_va[PL080_LLI_CCTL]);
llis_va += pl08x->lli_words;
}
}
}
#else
static inline void pl08x_dump_lli(struct pl08x_driver_data *pl08x,
const u32 *llis_va, int num_llis) {}
#endif
/*
* This fills in the table of LLIs for the transfer descriptor
* Note that we assume we never have to change the burst sizes
* Return 0 for error
*/
static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
struct pl08x_txd *txd)
{
struct pl08x_bus_data *mbus, *sbus;
struct pl08x_lli_build_data bd;
int num_llis = 0;
u32 cctl, early_bytes = 0;
size_t max_bytes_per_lli, total_bytes;
u32 *llis_va, *last_lli;
struct pl08x_sg *dsg;
txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus);
if (!txd->llis_va) {
dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__);
return 0;
}
bd.txd = txd;
bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0;
cctl = txd->cctl;
/* Find maximum width of the source bus */
bd.srcbus.maxwidth = pl08x_get_bytes_for_lli(pl08x, cctl, true);
/* Find maximum width of the destination bus */
bd.dstbus.maxwidth = pl08x_get_bytes_for_lli(pl08x, cctl, false);
list_for_each_entry(dsg, &txd->dsg_list, node) {
total_bytes = 0;
cctl = txd->cctl;
bd.srcbus.addr = dsg->src_addr;
bd.dstbus.addr = dsg->dst_addr;
bd.remainder = dsg->len;
bd.srcbus.buswidth = bd.srcbus.maxwidth;
bd.dstbus.buswidth = bd.dstbus.maxwidth;
pl08x_choose_master_bus(pl08x, &bd, &mbus, &sbus, cctl);
dev_vdbg(&pl08x->adev->dev,
"src=0x%08llx%s/%u dst=0x%08llx%s/%u len=%zu\n",
(u64)bd.srcbus.addr,
cctl & PL080_CONTROL_SRC_INCR ? "+" : "",
bd.srcbus.buswidth,
(u64)bd.dstbus.addr,
cctl & PL080_CONTROL_DST_INCR ? "+" : "",
bd.dstbus.buswidth,
bd.remainder);
dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n",
mbus == &bd.srcbus ? "src" : "dst",
sbus == &bd.srcbus ? "src" : "dst");
/*
* Zero length is only allowed if all these requirements are
* met:
* - flow controller is peripheral.
* - src.addr is aligned to src.width
* - dst.addr is aligned to dst.width
*
* sg_len == 1 should be true, as there can be two cases here:
*
* - Memory addresses are contiguous and are not scattered.
* Here, Only one sg will be passed by user driver, with
* memory address and zero length. We pass this to controller
* and after the transfer it will receive the last burst
* request from peripheral and so transfer finishes.
*
* - Memory addresses are scattered and are not contiguous.
* Here, Obviously as DMA controller doesn't know when a lli's
* transfer gets over, it can't load next lli. So in this
* case, there has to be an assumption that only one lli is
* supported. Thus, we can't have scattered addresses.
*/
if (!bd.remainder) {
u32 fc;
/* FTDMAC020 only does memory-to-memory */
if (pl08x->vd->ftdmac020)
fc = PL080_FLOW_MEM2MEM;
else
fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >>
PL080_CONFIG_FLOW_CONTROL_SHIFT;
if (!((fc >= PL080_FLOW_SRC2DST_DST) &&
(fc <= PL080_FLOW_SRC2DST_SRC))) {
dev_err(&pl08x->adev->dev, "%s sg len can't be zero",
__func__);
return 0;
}
if (!IS_BUS_ALIGNED(&bd.srcbus) ||
!IS_BUS_ALIGNED(&bd.dstbus)) {
dev_err(&pl08x->adev->dev,
"%s src & dst address must be aligned to src"
" & dst width if peripheral is flow controller",
__func__);
return 0;
}
cctl = pl08x_lli_control_bits(pl08x, cctl,
bd.srcbus.buswidth, bd.dstbus.buswidth,
0);
pl08x_fill_lli_for_desc(pl08x, &bd, num_llis++,
0, cctl, 0);
break;
}
/*
* Send byte by byte for following cases
* - Less than a bus width available
* - until master bus is aligned
*/
if (bd.remainder < mbus->buswidth)
early_bytes = bd.remainder;
else if (!IS_BUS_ALIGNED(mbus)) {
early_bytes = mbus->buswidth -
(mbus->addr & (mbus->buswidth - 1));
if ((bd.remainder - early_bytes) < mbus->buswidth)
early_bytes = bd.remainder;
}
if (early_bytes) {
dev_vdbg(&pl08x->adev->dev,
"%s byte width LLIs (remain 0x%08zx)\n",
__func__, bd.remainder);
prep_byte_width_lli(pl08x, &bd, &cctl, early_bytes,
num_llis++, &total_bytes);
}
if (bd.remainder) {
/*
* Master now aligned
* - if slave is not then we must set its width down
*/
if (!IS_BUS_ALIGNED(sbus)) {
dev_dbg(&pl08x->adev->dev,
"%s set down bus width to one byte\n",
__func__);
sbus->buswidth = 1;
}
/*
* Bytes transferred = tsize * src width, not
* MIN(buswidths)
*/
max_bytes_per_lli = bd.srcbus.buswidth *
pl08x->vd->max_transfer_size;
dev_vdbg(&pl08x->adev->dev,
"%s max bytes per lli = %zu\n",
__func__, max_bytes_per_lli);
/*
* Make largest possible LLIs until less than one bus
* width left
*/
while (bd.remainder > (mbus->buswidth - 1)) {
size_t lli_len, tsize, width;
/*
* If enough left try to send max possible,
* otherwise try to send the remainder
*/
lli_len = min(bd.remainder, max_bytes_per_lli);
/*
* Check against maximum bus alignment:
* Calculate actual transfer size in relation to
* bus width an get a maximum remainder of the
* highest bus width - 1
*/
width = max(mbus->buswidth, sbus->buswidth);
lli_len = (lli_len / width) * width;
tsize = lli_len / bd.srcbus.buswidth;
dev_vdbg(&pl08x->adev->dev,
"%s fill lli with single lli chunk of "
"size 0x%08zx (remainder 0x%08zx)\n",
__func__, lli_len, bd.remainder);
cctl = pl08x_lli_control_bits(pl08x, cctl,
bd.srcbus.buswidth, bd.dstbus.buswidth,
tsize);
pl08x_fill_lli_for_desc(pl08x, &bd, num_llis++,
lli_len, cctl, tsize);
total_bytes += lli_len;
}
/*
* Send any odd bytes
*/
if (bd.remainder) {
dev_vdbg(&pl08x->adev->dev,
"%s align with boundary, send odd bytes (remain %zu)\n",
__func__, bd.remainder);
prep_byte_width_lli(pl08x, &bd, &cctl,
bd.remainder, num_llis++, &total_bytes);
}
}
if (total_bytes != dsg->len) {
dev_err(&pl08x->adev->dev,
"%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n",
__func__, total_bytes, dsg->len);
return 0;
}
if (num_llis >= MAX_NUM_TSFR_LLIS) {
dev_err(&pl08x->adev->dev,
"%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n",
__func__, MAX_NUM_TSFR_LLIS);
return 0;
}
}
llis_va = txd->llis_va;
last_lli = llis_va + (num_llis - 1) * pl08x->lli_words;
if (txd->cyclic) {
/* Link back to the first LLI. */
last_lli[PL080_LLI_LLI] = txd->llis_bus | bd.lli_bus;
} else {
/* The final LLI terminates the LLI. */
last_lli[PL080_LLI_LLI] = 0;
/* The final LLI element shall also fire an interrupt. */
if (pl08x->vd->ftdmac020)
last_lli[PL080_LLI_CCTL] &= ~FTDMAC020_LLI_TC_MSK;
else
last_lli[PL080_LLI_CCTL] |= PL080_CONTROL_TC_IRQ_EN;
}
pl08x_dump_lli(pl08x, llis_va, num_llis);
return num_llis;
}
static void pl08x_free_txd(struct pl08x_driver_data *pl08x,
struct pl08x_txd *txd)
{
struct pl08x_sg *dsg, *_dsg;
if (txd->llis_va)
dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus);
list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) {
list_del(&dsg->node);
kfree(dsg);
}
kfree(txd);
}
static void pl08x_desc_free(struct virt_dma_desc *vd)
{
struct pl08x_txd *txd = to_pl08x_txd(&vd->tx);
struct pl08x_dma_chan *plchan = to_pl08x_chan(vd->tx.chan);
dma_descriptor_unmap(&vd->tx);
if (!txd->done)
pl08x_release_mux(plchan);
pl08x_free_txd(plchan->host, txd);
}
static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
struct pl08x_dma_chan *plchan)
{
LIST_HEAD(head);
vchan_get_all_descriptors(&plchan->vc, &head);
vchan_dma_desc_free_list(&plchan->vc, &head);
}
/*
* The DMA ENGINE API
*/
static void pl08x_free_chan_resources(struct dma_chan *chan)
{
/* Ensure all queued descriptors are freed */
vchan_free_chan_resources(to_virt_chan(chan));
}
static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt(
struct dma_chan *chan, unsigned long flags)
{
struct dma_async_tx_descriptor *retval = NULL;
return retval;
}
/*
* Code accessing dma_async_is_complete() in a tight loop may give problems.
* If slaves are relying on interrupts to signal completion this function
* must not be called with interrupts disabled.
*/
static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct virt_dma_desc *vd;
unsigned long flags;
enum dma_status ret;
size_t bytes = 0;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
/*
* There's no point calculating the residue if there's
* no txstate to store the value.
*/
if (!txstate) {
if (plchan->state == PL08X_CHAN_PAUSED)
ret = DMA_PAUSED;
return ret;
}
spin_lock_irqsave(&plchan->vc.lock, flags);
ret = dma_cookie_status(chan, cookie, txstate);
if (ret != DMA_COMPLETE) {
vd = vchan_find_desc(&plchan->vc, cookie);
if (vd) {
/* On the issued list, so hasn't been processed yet */
struct pl08x_txd *txd = to_pl08x_txd(&vd->tx);
struct pl08x_sg *dsg;
list_for_each_entry(dsg, &txd->dsg_list, node)
bytes += dsg->len;
} else {
bytes = pl08x_getbytes_chan(plchan);
}
}
spin_unlock_irqrestore(&plchan->vc.lock, flags);
/*
* This cookie not complete yet
* Get number of bytes left in the active transactions and queue
*/
dma_set_residue(txstate, bytes);
if (plchan->state == PL08X_CHAN_PAUSED && ret == DMA_IN_PROGRESS)
ret = DMA_PAUSED;
/* Whether waiting or running, we're in progress */
return ret;
}
/* PrimeCell DMA extension */
struct burst_table {
u32 burstwords;
u32 reg;
};
static const struct burst_table burst_sizes[] = {
{
.burstwords = 256,
.reg = PL080_BSIZE_256,
},
{
.burstwords = 128,
.reg = PL080_BSIZE_128,
},
{
.burstwords = 64,
.reg = PL080_BSIZE_64,
},
{
.burstwords = 32,
.reg = PL080_BSIZE_32,
},
{
.burstwords = 16,
.reg = PL080_BSIZE_16,
},
{
.burstwords = 8,
.reg = PL080_BSIZE_8,
},
{
.burstwords = 4,
.reg = PL080_BSIZE_4,
},
{
.burstwords = 0,
.reg = PL080_BSIZE_1,
},
};
/*
* Given the source and destination available bus masks, select which
* will be routed to each port. We try to have source and destination
* on separate ports, but always respect the allowable settings.
*/
static u32 pl08x_select_bus(bool ftdmac020, u8 src, u8 dst)
{
u32 cctl = 0;
u32 dst_ahb2;
u32 src_ahb2;
/* The FTDMAC020 use different bits to indicate src/dst bus */
if (ftdmac020) {
dst_ahb2 = FTDMAC020_LLI_DST_SEL;
src_ahb2 = FTDMAC020_LLI_SRC_SEL;
} else {
dst_ahb2 = PL080_CONTROL_DST_AHB2;
src_ahb2 = PL080_CONTROL_SRC_AHB2;
}
if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1)))
cctl |= dst_ahb2;
if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2)))
cctl |= src_ahb2;
return cctl;
}
static u32 pl08x_cctl(u32 cctl)
{
cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 |
PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR |
PL080_CONTROL_PROT_MASK);
/* Access the cell in privileged mode, non-bufferable, non-cacheable */
return cctl | PL080_CONTROL_PROT_SYS;
}
static u32 pl08x_width(enum dma_slave_buswidth width)
{
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
return PL080_WIDTH_8BIT;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
return PL080_WIDTH_16BIT;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
return PL080_WIDTH_32BIT;
default:
return ~0;
}
}
static u32 pl08x_burst(u32 maxburst)
{
int i;
for (i = 0; i < ARRAY_SIZE(burst_sizes); i++)
if (burst_sizes[i].burstwords <= maxburst)
break;
return burst_sizes[i].reg;
}
static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan,
enum dma_slave_buswidth addr_width, u32 maxburst)
{
u32 width, burst, cctl = 0;
width = pl08x_width(addr_width);
if (width == ~0)
return ~0;
cctl |= width << PL080_CONTROL_SWIDTH_SHIFT;
cctl |= width << PL080_CONTROL_DWIDTH_SHIFT;
/*
* If this channel will only request single transfers, set this
* down to ONE element. Also select one element if no maxburst
* is specified.
*/
if (plchan->cd->single)
maxburst = 1;
burst = pl08x_burst(maxburst);
cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT;
cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT;
return pl08x_cctl(cctl);
}
/*
* Slave transactions callback to the slave device to allow
* synchronization of slave DMA signals with the DMAC enable
*/
static void pl08x_issue_pending(struct dma_chan *chan)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
unsigned long flags;
spin_lock_irqsave(&plchan->vc.lock, flags);
if (vchan_issue_pending(&plchan->vc)) {
if (!plchan->phychan && plchan->state != PL08X_CHAN_WAITING)
pl08x_phy_alloc_and_start(plchan);
}
spin_unlock_irqrestore(&plchan->vc.lock, flags);
}
static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan)
{
struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (txd)
INIT_LIST_HEAD(&txd->dsg_list);
return txd;
}
static u32 pl08x_memcpy_cctl(struct pl08x_driver_data *pl08x)
{
u32 cctl = 0;
/* Conjure cctl */
switch (pl08x->pd->memcpy_burst_size) {
default:
dev_err(&pl08x->adev->dev,
"illegal burst size for memcpy, set to 1\n");
/* Fall through */
case PL08X_BURST_SZ_1:
cctl |= PL080_BSIZE_1 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_1 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_4:
cctl |= PL080_BSIZE_4 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_4 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_8:
cctl |= PL080_BSIZE_8 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_8 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_16:
cctl |= PL080_BSIZE_16 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_16 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_32:
cctl |= PL080_BSIZE_32 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_32 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_64:
cctl |= PL080_BSIZE_64 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_64 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_128:
cctl |= PL080_BSIZE_128 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_128 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_256:
cctl |= PL080_BSIZE_256 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_256 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
}
switch (pl08x->pd->memcpy_bus_width) {
default:
dev_err(&pl08x->adev->dev,
"illegal bus width for memcpy, set to 8 bits\n");
/* Fall through */
case PL08X_BUS_WIDTH_8_BITS:
cctl |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT |
PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT;
break;
case PL08X_BUS_WIDTH_16_BITS:
cctl |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT |
PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT;
break;
case PL08X_BUS_WIDTH_32_BITS:
cctl |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT |
PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT;
break;
}
/* Protection flags */
if (pl08x->pd->memcpy_prot_buff)
cctl |= PL080_CONTROL_PROT_BUFF;
if (pl08x->pd->memcpy_prot_cache)
cctl |= PL080_CONTROL_PROT_CACHE;
/* We are the kernel, so we are in privileged mode */
cctl |= PL080_CONTROL_PROT_SYS;
/* Both to be incremented or the code will break */
cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR;
if (pl08x->vd->dualmaster)
cctl |= pl08x_select_bus(false,
pl08x->mem_buses,
pl08x->mem_buses);
return cctl;
}
static u32 pl08x_ftdmac020_memcpy_cctl(struct pl08x_driver_data *pl08x)
{
u32 cctl = 0;
/* Conjure cctl */
switch (pl08x->pd->memcpy_bus_width) {
default:
dev_err(&pl08x->adev->dev,
"illegal bus width for memcpy, set to 8 bits\n");
/* Fall through */
case PL08X_BUS_WIDTH_8_BITS:
cctl |= PL080_WIDTH_8BIT << FTDMAC020_LLI_SRC_WIDTH_SHIFT |
PL080_WIDTH_8BIT << FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
case PL08X_BUS_WIDTH_16_BITS:
cctl |= PL080_WIDTH_16BIT << FTDMAC020_LLI_SRC_WIDTH_SHIFT |
PL080_WIDTH_16BIT << FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
case PL08X_BUS_WIDTH_32_BITS:
cctl |= PL080_WIDTH_32BIT << FTDMAC020_LLI_SRC_WIDTH_SHIFT |
PL080_WIDTH_32BIT << FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
}
/*
* By default mask the TC IRQ on all LLIs, it will be unmasked on
* the last LLI item by other code.
*/
cctl |= FTDMAC020_LLI_TC_MSK;
/*
* Both to be incremented so leave bits FTDMAC020_LLI_SRCAD_CTL
* and FTDMAC020_LLI_DSTAD_CTL as zero
*/
if (pl08x->vd->dualmaster)
cctl |= pl08x_select_bus(true,
pl08x->mem_buses,
pl08x->mem_buses);
return cctl;
}
/*
* Initialize a descriptor to be used by memcpy submit
*/
static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_txd *txd;
struct pl08x_sg *dsg;
int ret;
txd = pl08x_get_txd(plchan);
if (!txd) {
dev_err(&pl08x->adev->dev,
"%s no memory for descriptor\n", __func__);
return NULL;
}
dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT);
if (!dsg) {
pl08x_free_txd(pl08x, txd);
return NULL;
}
list_add_tail(&dsg->node, &txd->dsg_list);
dsg->src_addr = src;
dsg->dst_addr = dest;
dsg->len = len;
if (pl08x->vd->ftdmac020) {
/* Writing CCFG zero ENABLES all interrupts */
txd->ccfg = 0;
txd->cctl = pl08x_ftdmac020_memcpy_cctl(pl08x);
} else {
txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK |
PL080_CONFIG_TC_IRQ_MASK |
PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
txd->cctl = pl08x_memcpy_cctl(pl08x);
}
ret = pl08x_fill_llis_for_desc(plchan->host, txd);
if (!ret) {
pl08x_free_txd(pl08x, txd);
return NULL;
}
return vchan_tx_prep(&plchan->vc, &txd->vd, flags);
}
static struct pl08x_txd *pl08x_init_txd(
struct dma_chan *chan,
enum dma_transfer_direction direction,
dma_addr_t *slave_addr)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_txd *txd;
enum dma_slave_buswidth addr_width;
int ret, tmp;
u8 src_buses, dst_buses;
u32 maxburst, cctl;
txd = pl08x_get_txd(plchan);
if (!txd) {
dev_err(&pl08x->adev->dev, "%s no txd\n", __func__);
return NULL;
}
/*
* Set up addresses, the PrimeCell configured address
* will take precedence since this may configure the
* channel target address dynamically at runtime.
*/
if (direction == DMA_MEM_TO_DEV) {
cctl = PL080_CONTROL_SRC_INCR;
*slave_addr = plchan->cfg.dst_addr;
addr_width = plchan->cfg.dst_addr_width;
maxburst = plchan->cfg.dst_maxburst;
src_buses = pl08x->mem_buses;
dst_buses = plchan->cd->periph_buses;
} else if (direction == DMA_DEV_TO_MEM) {
cctl = PL080_CONTROL_DST_INCR;
*slave_addr = plchan->cfg.src_addr;
addr_width = plchan->cfg.src_addr_width;
maxburst = plchan->cfg.src_maxburst;
src_buses = plchan->cd->periph_buses;
dst_buses = pl08x->mem_buses;
} else {
pl08x_free_txd(pl08x, txd);
dev_err(&pl08x->adev->dev,
"%s direction unsupported\n", __func__);
return NULL;
}
cctl |= pl08x_get_cctl(plchan, addr_width, maxburst);
if (cctl == ~0) {
pl08x_free_txd(pl08x, txd);
dev_err(&pl08x->adev->dev,
"DMA slave configuration botched?\n");
return NULL;
}
txd->cctl = cctl | pl08x_select_bus(false, src_buses, dst_buses);
if (plchan->cfg.device_fc)
tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER_PER :
PL080_FLOW_PER2MEM_PER;
else
tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER :
PL080_FLOW_PER2MEM;
txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK |
PL080_CONFIG_TC_IRQ_MASK |
tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT;
ret = pl08x_request_mux(plchan);
if (ret < 0) {
pl08x_free_txd(pl08x, txd);
dev_dbg(&pl08x->adev->dev,
"unable to mux for transfer on %s due to platform restrictions\n",
plchan->name);
return NULL;
}
dev_dbg(&pl08x->adev->dev, "allocated DMA request signal %d for xfer on %s\n",
plchan->signal, plchan->name);
/* Assign the flow control signal to this channel */
if (direction == DMA_MEM_TO_DEV)
txd->ccfg |= plchan->signal << PL080_CONFIG_DST_SEL_SHIFT;
else
txd->ccfg |= plchan->signal << PL080_CONFIG_SRC_SEL_SHIFT;
return txd;
}
static int pl08x_tx_add_sg(struct pl08x_txd *txd,
enum dma_transfer_direction direction,
dma_addr_t slave_addr,
dma_addr_t buf_addr,
unsigned int len)
{
struct pl08x_sg *dsg;
dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT);
if (!dsg)
return -ENOMEM;
list_add_tail(&dsg->node, &txd->dsg_list);
dsg->len = len;
if (direction == DMA_MEM_TO_DEV) {
dsg->src_addr = buf_addr;
dsg->dst_addr = slave_addr;
} else {
dsg->src_addr = slave_addr;
dsg->dst_addr = buf_addr;
}
return 0;
}
static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_txd *txd;
struct scatterlist *sg;
int ret, tmp;
dma_addr_t slave_addr;
dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n",
__func__, sg_dma_len(sgl), plchan->name);
txd = pl08x_init_txd(chan, direction, &slave_addr);
if (!txd)
return NULL;
for_each_sg(sgl, sg, sg_len, tmp) {
ret = pl08x_tx_add_sg(txd, direction, slave_addr,
sg_dma_address(sg),
sg_dma_len(sg));
if (ret) {
pl08x_release_mux(plchan);
pl08x_free_txd(pl08x, txd);
dev_err(&pl08x->adev->dev, "%s no mem for pl080 sg\n",
__func__);
return NULL;
}
}
ret = pl08x_fill_llis_for_desc(plchan->host, txd);
if (!ret) {
pl08x_release_mux(plchan);
pl08x_free_txd(pl08x, txd);
return NULL;
}
return vchan_tx_prep(&plchan->vc, &txd->vd, flags);
}
static struct dma_async_tx_descriptor *pl08x_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_txd *txd;
int ret, tmp;
dma_addr_t slave_addr;
dev_dbg(&pl08x->adev->dev,
"%s prepare cyclic transaction of %zd/%zd bytes %s %s\n",
__func__, period_len, buf_len,
direction == DMA_MEM_TO_DEV ? "to" : "from",
plchan->name);
txd = pl08x_init_txd(chan, direction, &slave_addr);
if (!txd)
return NULL;
txd->cyclic = true;
txd->cctl |= PL080_CONTROL_TC_IRQ_EN;
for (tmp = 0; tmp < buf_len; tmp += period_len) {
ret = pl08x_tx_add_sg(txd, direction, slave_addr,
buf_addr + tmp, period_len);
if (ret) {
pl08x_release_mux(plchan);
pl08x_free_txd(pl08x, txd);
return NULL;
}
}
ret = pl08x_fill_llis_for_desc(plchan->host, txd);
if (!ret) {
pl08x_release_mux(plchan);
pl08x_free_txd(pl08x, txd);
return NULL;
}
return vchan_tx_prep(&plchan->vc, &txd->vd, flags);
}
static int pl08x_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
if (!plchan->slave)
return -EINVAL;
/* Reject definitely invalid configurations */
if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
return -EINVAL;
if (config->device_fc && pl08x->vd->pl080s) {
dev_err(&pl08x->adev->dev,
"%s: PL080S does not support peripheral flow control\n",
__func__);
return -EINVAL;
}
plchan->cfg = *config;
return 0;
}
static int pl08x_terminate_all(struct dma_chan *chan)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
unsigned long flags;
spin_lock_irqsave(&plchan->vc.lock, flags);
if (!plchan->phychan && !plchan->at) {
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
plchan->state = PL08X_CHAN_IDLE;
if (plchan->phychan) {
/*
* Mark physical channel as free and free any slave
* signal
*/
pl08x_phy_free(plchan);
}
/* Dequeue jobs and free LLIs */
if (plchan->at) {
pl08x_desc_free(&plchan->at->vd);
plchan->at = NULL;
}
/* Dequeue jobs not yet fired as well */
pl08x_free_txd_list(pl08x, plchan);
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
static int pl08x_pause(struct dma_chan *chan)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
unsigned long flags;
/*
* Anything succeeds on channels with no physical allocation and
* no queued transfers.
*/
spin_lock_irqsave(&plchan->vc.lock, flags);
if (!plchan->phychan && !plchan->at) {
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
pl08x_pause_phy_chan(plchan->phychan);
plchan->state = PL08X_CHAN_PAUSED;
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
static int pl08x_resume(struct dma_chan *chan)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
unsigned long flags;
/*
* Anything succeeds on channels with no physical allocation and
* no queued transfers.
*/
spin_lock_irqsave(&plchan->vc.lock, flags);
if (!plchan->phychan && !plchan->at) {
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
pl08x_resume_phy_chan(plchan->phychan);
plchan->state = PL08X_CHAN_RUNNING;
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
{
struct pl08x_dma_chan *plchan;
char *name = chan_id;
/* Reject channels for devices not bound to this driver */
if (chan->device->dev->driver != &pl08x_amba_driver.drv)
return false;
plchan = to_pl08x_chan(chan);
/* Check that the channel is not taken! */
if (!strcmp(plchan->name, name))
return true;
return false;
}
EXPORT_SYMBOL_GPL(pl08x_filter_id);
static bool pl08x_filter_fn(struct dma_chan *chan, void *chan_id)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
return plchan->cd == chan_id;
}
/*
* Just check that the device is there and active
* TODO: turn this bit on/off depending on the number of physical channels
* actually used, if it is zero... well shut it off. That will save some
* power. Cut the clock at the same time.
*/
static void pl08x_ensure_on(struct pl08x_driver_data *pl08x)
{
/* The Nomadik variant does not have the config register */
if (pl08x->vd->nomadik)
return;
/* The FTDMAC020 variant does this in another register */
if (pl08x->vd->ftdmac020) {
writel(PL080_CONFIG_ENABLE, pl08x->base + FTDMAC020_CSR);
return;
}
writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG);
}
static irqreturn_t pl08x_irq(int irq, void *dev)
{
struct pl08x_driver_data *pl08x = dev;
u32 mask = 0, err, tc, i;
/* check & clear - ERR & TC interrupts */
err = readl(pl08x->base + PL080_ERR_STATUS);
if (err) {
dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n",
__func__, err);
writel(err, pl08x->base + PL080_ERR_CLEAR);
}
tc = readl(pl08x->base + PL080_TC_STATUS);
if (tc)
writel(tc, pl08x->base + PL080_TC_CLEAR);
if (!err && !tc)
return IRQ_NONE;
for (i = 0; i < pl08x->vd->channels; i++) {
if ((BIT(i) & err) || (BIT(i) & tc)) {
/* Locate physical channel */
struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i];
struct pl08x_dma_chan *plchan = phychan->serving;
struct pl08x_txd *tx;
if (!plchan) {
dev_err(&pl08x->adev->dev,
"%s Error TC interrupt on unused channel: 0x%08x\n",
__func__, i);
continue;
}
spin_lock(&plchan->vc.lock);
tx = plchan->at;
if (tx && tx->cyclic) {
vchan_cyclic_callback(&tx->vd);
} else if (tx) {
plchan->at = NULL;
/*
* This descriptor is done, release its mux
* reservation.
*/
pl08x_release_mux(plchan);
tx->done = true;
vchan_cookie_complete(&tx->vd);
/*
* And start the next descriptor (if any),
* otherwise free this channel.
*/
if (vchan_next_desc(&plchan->vc))
pl08x_start_next_txd(plchan);
else
pl08x_phy_free(plchan);
}
spin_unlock(&plchan->vc.lock);
mask |= BIT(i);
}
}
return mask ? IRQ_HANDLED : IRQ_NONE;
}
static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan)
{
chan->slave = true;
chan->name = chan->cd->bus_id;
chan->cfg.src_addr = chan->cd->addr;
chan->cfg.dst_addr = chan->cd->addr;
}
/*
* Initialise the DMAC memcpy/slave channels.
* Make a local wrapper to hold required data
*/
static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
struct dma_device *dmadev, unsigned int channels, bool slave)
{
struct pl08x_dma_chan *chan;
int i;
INIT_LIST_HEAD(&dmadev->channels);
/*
* Register as many many memcpy as we have physical channels,
* we won't always be able to use all but the code will have
* to cope with that situation.
*/
for (i = 0; i < channels; i++) {
chan = kzalloc(sizeof(*chan), GFP_KERNEL);
if (!chan)
return -ENOMEM;
chan->host = pl08x;
chan->state = PL08X_CHAN_IDLE;
chan->signal = -1;
if (slave) {
chan->cd = &pl08x->pd->slave_channels[i];
/*
* Some implementations have muxed signals, whereas some
* use a mux in front of the signals and need dynamic
* assignment of signals.
*/
chan->signal = i;
pl08x_dma_slave_init(chan);
} else {
chan->cd = kzalloc(sizeof(*chan->cd), GFP_KERNEL);
if (!chan->cd) {
kfree(chan);
return -ENOMEM;
}
chan->cd->bus_id = "memcpy";
chan->cd->periph_buses = pl08x->pd->mem_buses;
chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i);
if (!chan->name) {
kfree(chan->cd);
kfree(chan);
return -ENOMEM;
}
}
dev_dbg(&pl08x->adev->dev,
"initialize virtual channel \"%s\"\n",
chan->name);
chan->vc.desc_free = pl08x_desc_free;
vchan_init(&chan->vc, dmadev);
}
dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n",
i, slave ? "slave" : "memcpy");
return i;
}
static void pl08x_free_virtual_channels(struct dma_device *dmadev)
{
struct pl08x_dma_chan *chan = NULL;
struct pl08x_dma_chan *next;
list_for_each_entry_safe(chan,
next, &dmadev->channels, vc.chan.device_node) {
list_del(&chan->vc.chan.device_node);
kfree(chan);
}
}
#ifdef CONFIG_DEBUG_FS
static const char *pl08x_state_str(enum pl08x_dma_chan_state state)
{
switch (state) {
case PL08X_CHAN_IDLE:
return "idle";
case PL08X_CHAN_RUNNING:
return "running";
case PL08X_CHAN_PAUSED:
return "paused";
case PL08X_CHAN_WAITING:
return "waiting";
default:
break;
}
return "UNKNOWN STATE";
}
static int pl08x_debugfs_show(struct seq_file *s, void *data)
{
struct pl08x_driver_data *pl08x = s->private;
struct pl08x_dma_chan *chan;
struct pl08x_phy_chan *ch;
unsigned long flags;
int i;
seq_printf(s, "PL08x physical channels:\n");
seq_printf(s, "CHANNEL:\tUSER:\n");
seq_printf(s, "--------\t-----\n");
for (i = 0; i < pl08x->vd->channels; i++) {
struct pl08x_dma_chan *virt_chan;
ch = &pl08x->phy_chans[i];
spin_lock_irqsave(&ch->lock, flags);
virt_chan = ch->serving;
seq_printf(s, "%d\t\t%s%s\n",
ch->id,
virt_chan ? virt_chan->name : "(none)",
ch->locked ? " LOCKED" : "");
spin_unlock_irqrestore(&ch->lock, flags);
}
seq_printf(s, "\nPL08x virtual memcpy channels:\n");
seq_printf(s, "CHANNEL:\tSTATE:\n");
seq_printf(s, "--------\t------\n");
list_for_each_entry(chan, &pl08x->memcpy.channels, vc.chan.device_node) {
seq_printf(s, "%s\t\t%s\n", chan->name,
pl08x_state_str(chan->state));
}
if (pl08x->has_slave) {
seq_printf(s, "\nPL08x virtual slave channels:\n");
seq_printf(s, "CHANNEL:\tSTATE:\n");
seq_printf(s, "--------\t------\n");
list_for_each_entry(chan, &pl08x->slave.channels,
vc.chan.device_node) {
seq_printf(s, "%s\t\t%s\n", chan->name,
pl08x_state_str(chan->state));
}
}
return 0;
}
static int pl08x_debugfs_open(struct inode *inode, struct file *file)
{
return single_open(file, pl08x_debugfs_show, inode->i_private);
}
static const struct file_operations pl08x_debugfs_operations = {
.open = pl08x_debugfs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
{
/* Expose a simple debugfs interface to view all clocks */
(void) debugfs_create_file(dev_name(&pl08x->adev->dev),
S_IFREG | S_IRUGO, NULL, pl08x,
&pl08x_debugfs_operations);
}
#else
static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
{
}
#endif
#ifdef CONFIG_OF
static struct dma_chan *pl08x_find_chan_id(struct pl08x_driver_data *pl08x,
u32 id)
{
struct pl08x_dma_chan *chan;
/* Trying to get a slave channel from something with no slave support */
if (!pl08x->has_slave)
return NULL;
list_for_each_entry(chan, &pl08x->slave.channels, vc.chan.device_node) {
if (chan->signal == id)
return &chan->vc.chan;
}
return NULL;
}
static struct dma_chan *pl08x_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct pl08x_driver_data *pl08x = ofdma->of_dma_data;
struct dma_chan *dma_chan;
struct pl08x_dma_chan *plchan;
if (!pl08x)
return NULL;
if (dma_spec->args_count != 2) {
dev_err(&pl08x->adev->dev,
"DMA channel translation requires two cells\n");
return NULL;
}
dma_chan = pl08x_find_chan_id(pl08x, dma_spec->args[0]);
if (!dma_chan) {
dev_err(&pl08x->adev->dev,
"DMA slave channel not found\n");
return NULL;
}
plchan = to_pl08x_chan(dma_chan);
dev_dbg(&pl08x->adev->dev,
"translated channel for signal %d\n",
dma_spec->args[0]);
/* Augment channel data for applicable AHB buses */
plchan->cd->periph_buses = dma_spec->args[1];
return dma_get_slave_channel(dma_chan);
}
static int pl08x_of_probe(struct amba_device *adev,
struct pl08x_driver_data *pl08x,
struct device_node *np)
{
struct pl08x_platform_data *pd;
struct pl08x_channel_data *chanp = NULL;
u32 val;
int ret;
int i;
pd = devm_kzalloc(&adev->dev, sizeof(*pd), GFP_KERNEL);
if (!pd)
return -ENOMEM;
/* Eligible bus masters for fetching LLIs */
if (of_property_read_bool(np, "lli-bus-interface-ahb1"))
pd->lli_buses |= PL08X_AHB1;
if (of_property_read_bool(np, "lli-bus-interface-ahb2"))
pd->lli_buses |= PL08X_AHB2;
if (!pd->lli_buses) {
dev_info(&adev->dev, "no bus masters for LLIs stated, assume all\n");
pd->lli_buses |= PL08X_AHB1 | PL08X_AHB2;
}
/* Eligible bus masters for memory access */
if (of_property_read_bool(np, "mem-bus-interface-ahb1"))
pd->mem_buses |= PL08X_AHB1;
if (of_property_read_bool(np, "mem-bus-interface-ahb2"))
pd->mem_buses |= PL08X_AHB2;
if (!pd->mem_buses) {
dev_info(&adev->dev, "no bus masters for memory stated, assume all\n");
pd->mem_buses |= PL08X_AHB1 | PL08X_AHB2;
}
/* Parse the memcpy channel properties */
ret = of_property_read_u32(np, "memcpy-burst-size", &val);
if (ret) {
dev_info(&adev->dev, "no memcpy burst size specified, using 1 byte\n");
val = 1;
}
switch (val) {
default:
dev_err(&adev->dev, "illegal burst size for memcpy, set to 1\n");
/* Fall through */
case 1:
pd->memcpy_burst_size = PL08X_BURST_SZ_1;
break;
case 4:
pd->memcpy_burst_size = PL08X_BURST_SZ_4;
break;
case 8:
pd->memcpy_burst_size = PL08X_BURST_SZ_8;
break;
case 16:
pd->memcpy_burst_size = PL08X_BURST_SZ_16;
break;
case 32:
pd->memcpy_burst_size = PL08X_BURST_SZ_32;
break;
case 64:
pd->memcpy_burst_size = PL08X_BURST_SZ_64;
break;
case 128:
pd->memcpy_burst_size = PL08X_BURST_SZ_128;
break;
case 256:
pd->memcpy_burst_size = PL08X_BURST_SZ_256;
break;
}
ret = of_property_read_u32(np, "memcpy-bus-width", &val);
if (ret) {
dev_info(&adev->dev, "no memcpy bus width specified, using 8 bits\n");
val = 8;
}
switch (val) {
default:
dev_err(&adev->dev, "illegal bus width for memcpy, set to 8 bits\n");
/* Fall through */
case 8:
pd->memcpy_bus_width = PL08X_BUS_WIDTH_8_BITS;
break;
case 16:
pd->memcpy_bus_width = PL08X_BUS_WIDTH_16_BITS;
break;
case 32:
pd->memcpy_bus_width = PL08X_BUS_WIDTH_32_BITS;
break;
}
/*
* Allocate channel data for all possible slave channels (one
* for each possible signal), channels will then be allocated
* for a device and have it's AHB interfaces set up at
* translation time.
*/
if (pl08x->vd->signals) {
chanp = devm_kcalloc(&adev->dev,
pl08x->vd->signals,
sizeof(struct pl08x_channel_data),
GFP_KERNEL);
if (!chanp)
return -ENOMEM;
pd->slave_channels = chanp;
for (i = 0; i < pl08x->vd->signals; i++) {
/*
* chanp->periph_buses will be assigned at translation
*/
chanp->bus_id = kasprintf(GFP_KERNEL, "slave%d", i);
chanp++;
}
pd->num_slave_channels = pl08x->vd->signals;
}
pl08x->pd = pd;
return of_dma_controller_register(adev->dev.of_node, pl08x_of_xlate,
pl08x);
}
#else
static inline int pl08x_of_probe(struct amba_device *adev,
struct pl08x_driver_data *pl08x,
struct device_node *np)
{
return -EINVAL;
}
#endif
static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
{
struct pl08x_driver_data *pl08x;
struct vendor_data *vd = id->data;
struct device_node *np = adev->dev.of_node;
u32 tsfr_size;
int ret = 0;
int i;
ret = amba_request_regions(adev, NULL);
if (ret)
return ret;
/* Ensure that we can do DMA */
ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32));
if (ret)
goto out_no_pl08x;
/* Create the driver state holder */
pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL);
if (!pl08x) {
ret = -ENOMEM;
goto out_no_pl08x;
}
/* Assign useful pointers to the driver state */
pl08x->adev = adev;
pl08x->vd = vd;
pl08x->base = ioremap(adev->res.start, resource_size(&adev->res));
if (!pl08x->base) {
ret = -ENOMEM;
goto out_no_ioremap;
}
if (vd->ftdmac020) {
u32 val;
val = readl(pl08x->base + FTDMAC020_REVISION);
dev_info(&pl08x->adev->dev, "FTDMAC020 %d.%d rel %d\n",
(val >> 16) & 0xff, (val >> 8) & 0xff, val & 0xff);
val = readl(pl08x->base + FTDMAC020_FEATURE);
dev_info(&pl08x->adev->dev, "FTDMAC020 %d channels, "
"%s built-in bridge, %s, %s linked lists\n",
(val >> 12) & 0x0f,
(val & BIT(10)) ? "no" : "has",
(val & BIT(9)) ? "AHB0 and AHB1" : "AHB0",
(val & BIT(8)) ? "supports" : "does not support");
/* Vendor data from feature register */
if (!(val & BIT(8)))
dev_warn(&pl08x->adev->dev,
"linked lists not supported, required\n");
vd->channels = (val >> 12) & 0x0f;
vd->dualmaster = !!(val & BIT(9));
}
/* Initialize memcpy engine */
dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask);
pl08x->memcpy.dev = &adev->dev;
pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources;
pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy;
pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
pl08x->memcpy.device_tx_status = pl08x_dma_tx_status;
pl08x->memcpy.device_issue_pending = pl08x_issue_pending;
pl08x->memcpy.device_config = pl08x_config;
pl08x->memcpy.device_pause = pl08x_pause;
pl08x->memcpy.device_resume = pl08x_resume;
pl08x->memcpy.device_terminate_all = pl08x_terminate_all;
pl08x->memcpy.src_addr_widths = PL80X_DMA_BUSWIDTHS;
pl08x->memcpy.dst_addr_widths = PL80X_DMA_BUSWIDTHS;
pl08x->memcpy.directions = BIT(DMA_MEM_TO_MEM);
pl08x->memcpy.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
if (vd->ftdmac020)
pl08x->memcpy.copy_align = DMAENGINE_ALIGN_4_BYTES;
/*
* Initialize slave engine, if the block has no signals, that means
* we have no slave support.
*/
if (vd->signals) {
pl08x->has_slave = true;
dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask);
dma_cap_set(DMA_CYCLIC, pl08x->slave.cap_mask);
pl08x->slave.dev = &adev->dev;
pl08x->slave.device_free_chan_resources =
pl08x_free_chan_resources;
pl08x->slave.device_prep_dma_interrupt =
pl08x_prep_dma_interrupt;
pl08x->slave.device_tx_status = pl08x_dma_tx_status;
pl08x->slave.device_issue_pending = pl08x_issue_pending;
pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg;
pl08x->slave.device_prep_dma_cyclic = pl08x_prep_dma_cyclic;
pl08x->slave.device_config = pl08x_config;
pl08x->slave.device_pause = pl08x_pause;
pl08x->slave.device_resume = pl08x_resume;
pl08x->slave.device_terminate_all = pl08x_terminate_all;
pl08x->slave.src_addr_widths = PL80X_DMA_BUSWIDTHS;
pl08x->slave.dst_addr_widths = PL80X_DMA_BUSWIDTHS;
pl08x->slave.directions =
BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
pl08x->slave.residue_granularity =
DMA_RESIDUE_GRANULARITY_SEGMENT;
}
/* Get the platform data */
pl08x->pd = dev_get_platdata(&adev->dev);
if (!pl08x->pd) {
if (np) {
ret = pl08x_of_probe(adev, pl08x, np);
if (ret)
goto out_no_platdata;
} else {
dev_err(&adev->dev, "no platform data supplied\n");
ret = -EINVAL;
goto out_no_platdata;
}
} else {
pl08x->slave.filter.map = pl08x->pd->slave_map;
pl08x->slave.filter.mapcnt = pl08x->pd->slave_map_len;
pl08x->slave.filter.fn = pl08x_filter_fn;
}
/* By default, AHB1 only. If dualmaster, from platform */
pl08x->lli_buses = PL08X_AHB1;
pl08x->mem_buses = PL08X_AHB1;
if (pl08x->vd->dualmaster) {
pl08x->lli_buses = pl08x->pd->lli_buses;
pl08x->mem_buses = pl08x->pd->mem_buses;
}
if (vd->pl080s)
pl08x->lli_words = PL080S_LLI_WORDS;
else
pl08x->lli_words = PL080_LLI_WORDS;
tsfr_size = MAX_NUM_TSFR_LLIS * pl08x->lli_words * sizeof(u32);
/* A DMA memory pool for LLIs, align on 1-byte boundary */
pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev,
tsfr_size, PL08X_ALIGN, 0);
if (!pl08x->pool) {
ret = -ENOMEM;
goto out_no_lli_pool;
}
/* Turn on the PL08x */
pl08x_ensure_on(pl08x);
/* Clear any pending interrupts */
if (vd->ftdmac020)
/* This variant has error IRQs in bits 16-19 */
writel(0x0000FFFF, pl08x->base + PL080_ERR_CLEAR);
else
writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR);
writel(0x000000FF, pl08x->base + PL080_TC_CLEAR);
/* Attach the interrupt handler */
ret = request_irq(adev->irq[0], pl08x_irq, 0, DRIVER_NAME, pl08x);
if (ret) {
dev_err(&adev->dev, "%s failed to request interrupt %d\n",
__func__, adev->irq[0]);
goto out_no_irq;
}
/* Initialize physical channels */
pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)),
GFP_KERNEL);
if (!pl08x->phy_chans) {
ret = -ENOMEM;
goto out_no_phychans;
}
for (i = 0; i < vd->channels; i++) {
struct pl08x_phy_chan *ch = &pl08x->phy_chans[i];
ch->id = i;
ch->base = pl08x->base + PL080_Cx_BASE(i);
if (vd->ftdmac020) {
/* FTDMA020 has a special channel busy register */
ch->reg_busy = ch->base + FTDMAC020_CH_BUSY;
ch->reg_config = ch->base + FTDMAC020_CH_CFG;
ch->reg_control = ch->base + FTDMAC020_CH_CSR;
ch->reg_src = ch->base + FTDMAC020_CH_SRC_ADDR;
ch->reg_dst = ch->base + FTDMAC020_CH_DST_ADDR;
ch->reg_lli = ch->base + FTDMAC020_CH_LLP;
ch->ftdmac020 = true;
} else {
ch->reg_config = ch->base + vd->config_offset;
ch->reg_control = ch->base + PL080_CH_CONTROL;
ch->reg_src = ch->base + PL080_CH_SRC_ADDR;
ch->reg_dst = ch->base + PL080_CH_DST_ADDR;
ch->reg_lli = ch->base + PL080_CH_LLI;
}
if (vd->pl080s)
ch->pl080s = true;
spin_lock_init(&ch->lock);
/*
* Nomadik variants can have channels that are locked
* down for the secure world only. Lock up these channels
* by perpetually serving a dummy virtual channel.
*/
if (vd->nomadik) {
u32 val;
val = readl(ch->reg_config);
if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) {
dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i);
ch->locked = true;
}
}
dev_dbg(&adev->dev, "physical channel %d is %s\n",
i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE");
}
/* Register as many memcpy channels as there are physical channels */
ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy,
pl08x->vd->channels, false);
if (ret <= 0) {
dev_warn(&pl08x->adev->dev,
"%s failed to enumerate memcpy channels - %d\n",
__func__, ret);
goto out_no_memcpy;
}
/* Register slave channels */
if (pl08x->has_slave) {
ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave,
pl08x->pd->num_slave_channels, true);
if (ret < 0) {
dev_warn(&pl08x->adev->dev,
"%s failed to enumerate slave channels - %d\n",
__func__, ret);
goto out_no_slave;
}
}
ret = dma_async_device_register(&pl08x->memcpy);
if (ret) {
dev_warn(&pl08x->adev->dev,
"%s failed to register memcpy as an async device - %d\n",
__func__, ret);
goto out_no_memcpy_reg;
}
if (pl08x->has_slave) {
ret = dma_async_device_register(&pl08x->slave);
if (ret) {
dev_warn(&pl08x->adev->dev,
"%s failed to register slave as an async device - %d\n",
__func__, ret);
goto out_no_slave_reg;
}
}
amba_set_drvdata(adev, pl08x);
init_pl08x_debugfs(pl08x);
dev_info(&pl08x->adev->dev, "DMA: PL%03x%s rev%u at 0x%08llx irq %d\n",
amba_part(adev), pl08x->vd->pl080s ? "s" : "", amba_rev(adev),
(unsigned long long)adev->res.start, adev->irq[0]);
return 0;
out_no_slave_reg:
dma_async_device_unregister(&pl08x->memcpy);
out_no_memcpy_reg:
if (pl08x->has_slave)
pl08x_free_virtual_channels(&pl08x->slave);
out_no_slave:
pl08x_free_virtual_channels(&pl08x->memcpy);
out_no_memcpy:
kfree(pl08x->phy_chans);
out_no_phychans:
free_irq(adev->irq[0], pl08x);
out_no_irq:
dma_pool_destroy(pl08x->pool);
out_no_lli_pool:
out_no_platdata:
iounmap(pl08x->base);
out_no_ioremap:
kfree(pl08x);
out_no_pl08x:
amba_release_regions(adev);
return ret;
}
/* PL080 has 8 channels and the PL080 have just 2 */
static struct vendor_data vendor_pl080 = {
.config_offset = PL080_CH_CONFIG,
.channels = 8,
.signals = 16,
.dualmaster = true,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_nomadik = {
.config_offset = PL080_CH_CONFIG,
.channels = 8,
.signals = 32,
.dualmaster = true,
.nomadik = true,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_pl080s = {
.config_offset = PL080S_CH_CONFIG,
.channels = 8,
.signals = 32,
.pl080s = true,
.max_transfer_size = PL080S_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_pl081 = {
.config_offset = PL080_CH_CONFIG,
.channels = 2,
.signals = 16,
.dualmaster = false,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_ftdmac020 = {
.config_offset = PL080_CH_CONFIG,
.ftdmac020 = true,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct amba_id pl08x_ids[] = {
/* Samsung PL080S variant */
{
.id = 0x0a141080,
.mask = 0xffffffff,
.data = &vendor_pl080s,
},
/* PL080 */
{
.id = 0x00041080,
.mask = 0x000fffff,
.data = &vendor_pl080,
},
/* PL081 */
{
.id = 0x00041081,
.mask = 0x000fffff,
.data = &vendor_pl081,
},
/* Nomadik 8815 PL080 variant */
{
.id = 0x00280080,
.mask = 0x00ffffff,
.data = &vendor_nomadik,
},
/* Faraday Technology FTDMAC020 */
{
.id = 0x0003b080,
.mask = 0x000fffff,
.data = &vendor_ftdmac020,
},
{ 0, 0 },
};
MODULE_DEVICE_TABLE(amba, pl08x_ids);
static struct amba_driver pl08x_amba_driver = {
.drv.name = DRIVER_NAME,
.id_table = pl08x_ids,
.probe = pl08x_probe,
};
static int __init pl08x_init(void)
{
int retval;
retval = amba_driver_register(&pl08x_amba_driver);
if (retval)
printk(KERN_WARNING DRIVER_NAME
"failed to register as an AMBA device (%d)\n",
retval);
return retval;
}
subsys_initcall(pl08x_init);
View git blame Copy permalink