![Li Jun](/assets/img/avatar_default.png)
Since gadget driver will handle this request, so controller driver bypass it. Acked-by: Peter Chen <peter.chen@freescale.com> Signed-off-by: Li Jun <jun.li@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
2002 lines
48 KiB
C
2002 lines
48 KiB
C
/*
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* udc.c - ChipIdea UDC driver
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*
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* Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
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*
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* Author: David Lopo
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dmapool.h>
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#include <linux/err.h>
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#include <linux/irqreturn.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/otg-fsm.h>
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#include <linux/usb/chipidea.h>
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#include "ci.h"
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#include "udc.h"
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#include "bits.h"
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#include "otg.h"
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#include "otg_fsm.h"
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/* control endpoint description */
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static const struct usb_endpoint_descriptor
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ctrl_endpt_out_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
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.wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
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};
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static const struct usb_endpoint_descriptor
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ctrl_endpt_in_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
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.wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
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};
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/**
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* hw_ep_bit: calculates the bit number
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* @num: endpoint number
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* @dir: endpoint direction
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*
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* This function returns bit number
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*/
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static inline int hw_ep_bit(int num, int dir)
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{
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return num + (dir ? 16 : 0);
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}
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static inline int ep_to_bit(struct ci_hdrc *ci, int n)
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{
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int fill = 16 - ci->hw_ep_max / 2;
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if (n >= ci->hw_ep_max / 2)
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n += fill;
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return n;
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}
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/**
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* hw_device_state: enables/disables interrupts (execute without interruption)
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* @dma: 0 => disable, !0 => enable and set dma engine
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*
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* This function returns an error code
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*/
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static int hw_device_state(struct ci_hdrc *ci, u32 dma)
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{
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if (dma) {
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hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
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/* interrupt, error, port change, reset, sleep/suspend */
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hw_write(ci, OP_USBINTR, ~0,
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USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
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} else {
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hw_write(ci, OP_USBINTR, ~0, 0);
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}
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return 0;
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}
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/**
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* hw_ep_flush: flush endpoint fifo (execute without interruption)
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* @num: endpoint number
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* @dir: endpoint direction
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*
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* This function returns an error code
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*/
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static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
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{
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int n = hw_ep_bit(num, dir);
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do {
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/* flush any pending transfer */
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hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
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while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
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cpu_relax();
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} while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
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return 0;
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}
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/**
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* hw_ep_disable: disables endpoint (execute without interruption)
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* @num: endpoint number
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* @dir: endpoint direction
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*
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* This function returns an error code
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*/
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static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
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{
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hw_ep_flush(ci, num, dir);
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hw_write(ci, OP_ENDPTCTRL + num,
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dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
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return 0;
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}
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/**
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* hw_ep_enable: enables endpoint (execute without interruption)
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* @num: endpoint number
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* @dir: endpoint direction
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* @type: endpoint type
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*
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* This function returns an error code
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*/
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static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
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{
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u32 mask, data;
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if (dir) {
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mask = ENDPTCTRL_TXT; /* type */
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data = type << __ffs(mask);
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mask |= ENDPTCTRL_TXS; /* unstall */
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mask |= ENDPTCTRL_TXR; /* reset data toggle */
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data |= ENDPTCTRL_TXR;
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mask |= ENDPTCTRL_TXE; /* enable */
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data |= ENDPTCTRL_TXE;
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} else {
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mask = ENDPTCTRL_RXT; /* type */
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data = type << __ffs(mask);
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mask |= ENDPTCTRL_RXS; /* unstall */
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mask |= ENDPTCTRL_RXR; /* reset data toggle */
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data |= ENDPTCTRL_RXR;
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mask |= ENDPTCTRL_RXE; /* enable */
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data |= ENDPTCTRL_RXE;
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}
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hw_write(ci, OP_ENDPTCTRL + num, mask, data);
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return 0;
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}
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/**
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* hw_ep_get_halt: return endpoint halt status
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* @num: endpoint number
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* @dir: endpoint direction
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*
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* This function returns 1 if endpoint halted
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*/
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static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
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{
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u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
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return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
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}
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/**
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* hw_ep_prime: primes endpoint (execute without interruption)
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* @num: endpoint number
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* @dir: endpoint direction
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* @is_ctrl: true if control endpoint
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*
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* This function returns an error code
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*/
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static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
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{
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int n = hw_ep_bit(num, dir);
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if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
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return -EAGAIN;
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hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
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while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
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cpu_relax();
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if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
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return -EAGAIN;
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/* status shoult be tested according with manual but it doesn't work */
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return 0;
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}
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/**
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* hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
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* without interruption)
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* @num: endpoint number
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* @dir: endpoint direction
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* @value: true => stall, false => unstall
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*
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* This function returns an error code
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*/
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static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
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{
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if (value != 0 && value != 1)
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return -EINVAL;
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do {
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enum ci_hw_regs reg = OP_ENDPTCTRL + num;
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u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
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u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
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/* data toggle - reserved for EP0 but it's in ESS */
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hw_write(ci, reg, mask_xs|mask_xr,
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value ? mask_xs : mask_xr);
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} while (value != hw_ep_get_halt(ci, num, dir));
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return 0;
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}
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/**
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* hw_is_port_high_speed: test if port is high speed
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*
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* This function returns true if high speed port
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*/
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static int hw_port_is_high_speed(struct ci_hdrc *ci)
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{
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return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
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hw_read(ci, OP_PORTSC, PORTSC_HSP);
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}
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/**
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* hw_test_and_clear_complete: test & clear complete status (execute without
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* interruption)
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* @n: endpoint number
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*
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* This function returns complete status
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*/
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static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
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{
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n = ep_to_bit(ci, n);
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return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
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}
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/**
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* hw_test_and_clear_intr_active: test & clear active interrupts (execute
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* without interruption)
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*
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* This function returns active interrutps
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*/
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static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
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{
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u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
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hw_write(ci, OP_USBSTS, ~0, reg);
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return reg;
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}
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/**
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* hw_test_and_clear_setup_guard: test & clear setup guard (execute without
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* interruption)
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*
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* This function returns guard value
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*/
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static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
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{
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return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
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}
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/**
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* hw_test_and_set_setup_guard: test & set setup guard (execute without
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* interruption)
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*
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* This function returns guard value
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*/
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static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
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{
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return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
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}
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/**
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* hw_usb_set_address: configures USB address (execute without interruption)
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* @value: new USB address
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*
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* This function explicitly sets the address, without the "USBADRA" (advance)
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* feature, which is not supported by older versions of the controller.
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*/
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static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
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{
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hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
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value << __ffs(DEVICEADDR_USBADR));
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}
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/**
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* hw_usb_reset: restart device after a bus reset (execute without
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* interruption)
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*
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* This function returns an error code
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*/
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static int hw_usb_reset(struct ci_hdrc *ci)
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{
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hw_usb_set_address(ci, 0);
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/* ESS flushes only at end?!? */
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hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
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/* clear setup token semaphores */
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hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
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/* clear complete status */
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hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
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/* wait until all bits cleared */
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while (hw_read(ci, OP_ENDPTPRIME, ~0))
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udelay(10); /* not RTOS friendly */
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/* reset all endpoints ? */
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/* reset internal status and wait for further instructions
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no need to verify the port reset status (ESS does it) */
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return 0;
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}
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/******************************************************************************
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* UTIL block
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*****************************************************************************/
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static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
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unsigned length)
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{
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int i;
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u32 temp;
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struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
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GFP_ATOMIC);
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if (node == NULL)
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return -ENOMEM;
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node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC,
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&node->dma);
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if (node->ptr == NULL) {
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kfree(node);
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return -ENOMEM;
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}
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node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
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node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
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node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
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if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
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u32 mul = hwreq->req.length / hwep->ep.maxpacket;
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if (hwreq->req.length == 0
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|| hwreq->req.length % hwep->ep.maxpacket)
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mul++;
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node->ptr->token |= mul << __ffs(TD_MULTO);
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}
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temp = (u32) (hwreq->req.dma + hwreq->req.actual);
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if (length) {
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node->ptr->page[0] = cpu_to_le32(temp);
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for (i = 1; i < TD_PAGE_COUNT; i++) {
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u32 page = temp + i * CI_HDRC_PAGE_SIZE;
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page &= ~TD_RESERVED_MASK;
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node->ptr->page[i] = cpu_to_le32(page);
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}
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}
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hwreq->req.actual += length;
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if (!list_empty(&hwreq->tds)) {
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/* get the last entry */
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lastnode = list_entry(hwreq->tds.prev,
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struct td_node, td);
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lastnode->ptr->next = cpu_to_le32(node->dma);
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}
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INIT_LIST_HEAD(&node->td);
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list_add_tail(&node->td, &hwreq->tds);
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return 0;
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}
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/**
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* _usb_addr: calculates endpoint address from direction & number
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* @ep: endpoint
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*/
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static inline u8 _usb_addr(struct ci_hw_ep *ep)
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{
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return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
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}
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/**
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* _hardware_enqueue: configures a request at hardware level
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* @hwep: endpoint
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* @hwreq: request
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*
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* This function returns an error code
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*/
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static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
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{
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struct ci_hdrc *ci = hwep->ci;
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int ret = 0;
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unsigned rest = hwreq->req.length;
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int pages = TD_PAGE_COUNT;
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struct td_node *firstnode, *lastnode;
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/* don't queue twice */
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if (hwreq->req.status == -EALREADY)
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return -EALREADY;
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hwreq->req.status = -EALREADY;
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ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
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if (ret)
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return ret;
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/*
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* The first buffer could be not page aligned.
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* In that case we have to span into one extra td.
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*/
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if (hwreq->req.dma % PAGE_SIZE)
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pages--;
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if (rest == 0) {
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ret = add_td_to_list(hwep, hwreq, 0);
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if (ret < 0)
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goto done;
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}
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while (rest > 0) {
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unsigned count = min(hwreq->req.length - hwreq->req.actual,
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(unsigned)(pages * CI_HDRC_PAGE_SIZE));
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ret = add_td_to_list(hwep, hwreq, count);
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if (ret < 0)
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goto done;
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rest -= count;
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}
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if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
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&& (hwreq->req.length % hwep->ep.maxpacket == 0)) {
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ret = add_td_to_list(hwep, hwreq, 0);
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if (ret < 0)
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goto done;
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}
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firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
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lastnode = list_entry(hwreq->tds.prev,
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struct td_node, td);
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lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
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if (!hwreq->req.no_interrupt)
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lastnode->ptr->token |= cpu_to_le32(TD_IOC);
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wmb();
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hwreq->req.actual = 0;
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if (!list_empty(&hwep->qh.queue)) {
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struct ci_hw_req *hwreqprev;
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int n = hw_ep_bit(hwep->num, hwep->dir);
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int tmp_stat;
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struct td_node *prevlastnode;
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u32 next = firstnode->dma & TD_ADDR_MASK;
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hwreqprev = list_entry(hwep->qh.queue.prev,
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struct ci_hw_req, queue);
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prevlastnode = list_entry(hwreqprev->tds.prev,
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struct td_node, td);
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prevlastnode->ptr->next = cpu_to_le32(next);
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wmb();
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if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
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goto done;
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do {
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hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
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tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
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} while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
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hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
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if (tmp_stat)
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goto done;
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}
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/* QH configuration */
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hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
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hwep->qh.ptr->td.token &=
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cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
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if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
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u32 mul = hwreq->req.length / hwep->ep.maxpacket;
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if (hwreq->req.length == 0
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|| hwreq->req.length % hwep->ep.maxpacket)
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mul++;
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hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
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}
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wmb(); /* synchronize before ep prime */
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|
|
ret = hw_ep_prime(ci, hwep->num, hwep->dir,
|
|
hwep->type == USB_ENDPOINT_XFER_CONTROL);
|
|
done:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* free_pending_td: remove a pending request for the endpoint
|
|
* @hwep: endpoint
|
|
*/
|
|
static void free_pending_td(struct ci_hw_ep *hwep)
|
|
{
|
|
struct td_node *pending = hwep->pending_td;
|
|
|
|
dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
|
|
hwep->pending_td = NULL;
|
|
kfree(pending);
|
|
}
|
|
|
|
static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
|
|
struct td_node *node)
|
|
{
|
|
hwep->qh.ptr->td.next = node->dma;
|
|
hwep->qh.ptr->td.token &=
|
|
cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
|
|
|
|
/* Synchronize before ep prime */
|
|
wmb();
|
|
|
|
return hw_ep_prime(ci, hwep->num, hwep->dir,
|
|
hwep->type == USB_ENDPOINT_XFER_CONTROL);
|
|
}
|
|
|
|
/**
|
|
* _hardware_dequeue: handles a request at hardware level
|
|
* @gadget: gadget
|
|
* @hwep: endpoint
|
|
*
|
|
* This function returns an error code
|
|
*/
|
|
static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
|
|
{
|
|
u32 tmptoken;
|
|
struct td_node *node, *tmpnode;
|
|
unsigned remaining_length;
|
|
unsigned actual = hwreq->req.length;
|
|
struct ci_hdrc *ci = hwep->ci;
|
|
|
|
if (hwreq->req.status != -EALREADY)
|
|
return -EINVAL;
|
|
|
|
hwreq->req.status = 0;
|
|
|
|
list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
|
|
tmptoken = le32_to_cpu(node->ptr->token);
|
|
if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
|
|
int n = hw_ep_bit(hwep->num, hwep->dir);
|
|
|
|
if (ci->rev == CI_REVISION_24)
|
|
if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
|
|
reprime_dtd(ci, hwep, node);
|
|
hwreq->req.status = -EALREADY;
|
|
return -EBUSY;
|
|
}
|
|
|
|
remaining_length = (tmptoken & TD_TOTAL_BYTES);
|
|
remaining_length >>= __ffs(TD_TOTAL_BYTES);
|
|
actual -= remaining_length;
|
|
|
|
hwreq->req.status = tmptoken & TD_STATUS;
|
|
if ((TD_STATUS_HALTED & hwreq->req.status)) {
|
|
hwreq->req.status = -EPIPE;
|
|
break;
|
|
} else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
|
|
hwreq->req.status = -EPROTO;
|
|
break;
|
|
} else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
|
|
hwreq->req.status = -EILSEQ;
|
|
break;
|
|
}
|
|
|
|
if (remaining_length) {
|
|
if (hwep->dir) {
|
|
hwreq->req.status = -EPROTO;
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* As the hardware could still address the freed td
|
|
* which will run the udc unusable, the cleanup of the
|
|
* td has to be delayed by one.
|
|
*/
|
|
if (hwep->pending_td)
|
|
free_pending_td(hwep);
|
|
|
|
hwep->pending_td = node;
|
|
list_del_init(&node->td);
|
|
}
|
|
|
|
usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
|
|
|
|
hwreq->req.actual += actual;
|
|
|
|
if (hwreq->req.status)
|
|
return hwreq->req.status;
|
|
|
|
return hwreq->req.actual;
|
|
}
|
|
|
|
/**
|
|
* _ep_nuke: dequeues all endpoint requests
|
|
* @hwep: endpoint
|
|
*
|
|
* This function returns an error code
|
|
* Caller must hold lock
|
|
*/
|
|
static int _ep_nuke(struct ci_hw_ep *hwep)
|
|
__releases(hwep->lock)
|
|
__acquires(hwep->lock)
|
|
{
|
|
struct td_node *node, *tmpnode;
|
|
if (hwep == NULL)
|
|
return -EINVAL;
|
|
|
|
hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
|
|
|
|
while (!list_empty(&hwep->qh.queue)) {
|
|
|
|
/* pop oldest request */
|
|
struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
|
|
struct ci_hw_req, queue);
|
|
|
|
list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
|
|
dma_pool_free(hwep->td_pool, node->ptr, node->dma);
|
|
list_del_init(&node->td);
|
|
node->ptr = NULL;
|
|
kfree(node);
|
|
}
|
|
|
|
list_del_init(&hwreq->queue);
|
|
hwreq->req.status = -ESHUTDOWN;
|
|
|
|
if (hwreq->req.complete != NULL) {
|
|
spin_unlock(hwep->lock);
|
|
usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
|
|
spin_lock(hwep->lock);
|
|
}
|
|
}
|
|
|
|
if (hwep->pending_td)
|
|
free_pending_td(hwep);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
|
|
{
|
|
struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
|
|
int direction, retval = 0;
|
|
unsigned long flags;
|
|
|
|
if (ep == NULL || hwep->ep.desc == NULL)
|
|
return -EINVAL;
|
|
|
|
if (usb_endpoint_xfer_isoc(hwep->ep.desc))
|
|
return -EOPNOTSUPP;
|
|
|
|
spin_lock_irqsave(hwep->lock, flags);
|
|
|
|
if (value && hwep->dir == TX && check_transfer &&
|
|
!list_empty(&hwep->qh.queue) &&
|
|
!usb_endpoint_xfer_control(hwep->ep.desc)) {
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
direction = hwep->dir;
|
|
do {
|
|
retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
|
|
|
|
if (!value)
|
|
hwep->wedge = 0;
|
|
|
|
if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
|
|
hwep->dir = (hwep->dir == TX) ? RX : TX;
|
|
|
|
} while (hwep->dir != direction);
|
|
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
|
|
/**
|
|
* _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
|
|
* @gadget: gadget
|
|
*
|
|
* This function returns an error code
|
|
*/
|
|
static int _gadget_stop_activity(struct usb_gadget *gadget)
|
|
{
|
|
struct usb_ep *ep;
|
|
struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ci->lock, flags);
|
|
ci->gadget.speed = USB_SPEED_UNKNOWN;
|
|
ci->remote_wakeup = 0;
|
|
ci->suspended = 0;
|
|
spin_unlock_irqrestore(&ci->lock, flags);
|
|
|
|
/* flush all endpoints */
|
|
gadget_for_each_ep(ep, gadget) {
|
|
usb_ep_fifo_flush(ep);
|
|
}
|
|
usb_ep_fifo_flush(&ci->ep0out->ep);
|
|
usb_ep_fifo_flush(&ci->ep0in->ep);
|
|
|
|
/* make sure to disable all endpoints */
|
|
gadget_for_each_ep(ep, gadget) {
|
|
usb_ep_disable(ep);
|
|
}
|
|
|
|
if (ci->status != NULL) {
|
|
usb_ep_free_request(&ci->ep0in->ep, ci->status);
|
|
ci->status = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* ISR block
|
|
*****************************************************************************/
|
|
/**
|
|
* isr_reset_handler: USB reset interrupt handler
|
|
* @ci: UDC device
|
|
*
|
|
* This function resets USB engine after a bus reset occurred
|
|
*/
|
|
static void isr_reset_handler(struct ci_hdrc *ci)
|
|
__releases(ci->lock)
|
|
__acquires(ci->lock)
|
|
{
|
|
int retval;
|
|
|
|
spin_unlock(&ci->lock);
|
|
if (ci->gadget.speed != USB_SPEED_UNKNOWN)
|
|
usb_gadget_udc_reset(&ci->gadget, ci->driver);
|
|
|
|
retval = _gadget_stop_activity(&ci->gadget);
|
|
if (retval)
|
|
goto done;
|
|
|
|
retval = hw_usb_reset(ci);
|
|
if (retval)
|
|
goto done;
|
|
|
|
ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
|
|
if (ci->status == NULL)
|
|
retval = -ENOMEM;
|
|
|
|
done:
|
|
spin_lock(&ci->lock);
|
|
|
|
if (retval)
|
|
dev_err(ci->dev, "error: %i\n", retval);
|
|
}
|
|
|
|
/**
|
|
* isr_get_status_complete: get_status request complete function
|
|
* @ep: endpoint
|
|
* @req: request handled
|
|
*
|
|
* Caller must release lock
|
|
*/
|
|
static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
if (ep == NULL || req == NULL)
|
|
return;
|
|
|
|
kfree(req->buf);
|
|
usb_ep_free_request(ep, req);
|
|
}
|
|
|
|
/**
|
|
* _ep_queue: queues (submits) an I/O request to an endpoint
|
|
* @ep: endpoint
|
|
* @req: request
|
|
* @gfp_flags: GFP flags (not used)
|
|
*
|
|
* Caller must hold lock
|
|
* This function returns an error code
|
|
*/
|
|
static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
|
|
gfp_t __maybe_unused gfp_flags)
|
|
{
|
|
struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
|
|
struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
|
|
struct ci_hdrc *ci = hwep->ci;
|
|
int retval = 0;
|
|
|
|
if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
|
|
return -EINVAL;
|
|
|
|
if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
|
|
if (req->length)
|
|
hwep = (ci->ep0_dir == RX) ?
|
|
ci->ep0out : ci->ep0in;
|
|
if (!list_empty(&hwep->qh.queue)) {
|
|
_ep_nuke(hwep);
|
|
dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
|
|
_usb_addr(hwep));
|
|
}
|
|
}
|
|
|
|
if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
|
|
hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
|
|
dev_err(hwep->ci->dev, "request length too big for isochronous\n");
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* first nuke then test link, e.g. previous status has not sent */
|
|
if (!list_empty(&hwreq->queue)) {
|
|
dev_err(hwep->ci->dev, "request already in queue\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* push request */
|
|
hwreq->req.status = -EINPROGRESS;
|
|
hwreq->req.actual = 0;
|
|
|
|
retval = _hardware_enqueue(hwep, hwreq);
|
|
|
|
if (retval == -EALREADY)
|
|
retval = 0;
|
|
if (!retval)
|
|
list_add_tail(&hwreq->queue, &hwep->qh.queue);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* isr_get_status_response: get_status request response
|
|
* @ci: ci struct
|
|
* @setup: setup request packet
|
|
*
|
|
* This function returns an error code
|
|
*/
|
|
static int isr_get_status_response(struct ci_hdrc *ci,
|
|
struct usb_ctrlrequest *setup)
|
|
__releases(hwep->lock)
|
|
__acquires(hwep->lock)
|
|
{
|
|
struct ci_hw_ep *hwep = ci->ep0in;
|
|
struct usb_request *req = NULL;
|
|
gfp_t gfp_flags = GFP_ATOMIC;
|
|
int dir, num, retval;
|
|
|
|
if (hwep == NULL || setup == NULL)
|
|
return -EINVAL;
|
|
|
|
spin_unlock(hwep->lock);
|
|
req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
|
|
spin_lock(hwep->lock);
|
|
if (req == NULL)
|
|
return -ENOMEM;
|
|
|
|
req->complete = isr_get_status_complete;
|
|
req->length = 2;
|
|
req->buf = kzalloc(req->length, gfp_flags);
|
|
if (req->buf == NULL) {
|
|
retval = -ENOMEM;
|
|
goto err_free_req;
|
|
}
|
|
|
|
if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
|
|
*(u16 *)req->buf = (ci->remote_wakeup << 1) |
|
|
ci->gadget.is_selfpowered;
|
|
} else if ((setup->bRequestType & USB_RECIP_MASK) \
|
|
== USB_RECIP_ENDPOINT) {
|
|
dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
|
|
TX : RX;
|
|
num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
|
|
*(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
|
|
}
|
|
/* else do nothing; reserved for future use */
|
|
|
|
retval = _ep_queue(&hwep->ep, req, gfp_flags);
|
|
if (retval)
|
|
goto err_free_buf;
|
|
|
|
return 0;
|
|
|
|
err_free_buf:
|
|
kfree(req->buf);
|
|
err_free_req:
|
|
spin_unlock(hwep->lock);
|
|
usb_ep_free_request(&hwep->ep, req);
|
|
spin_lock(hwep->lock);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* isr_setup_status_complete: setup_status request complete function
|
|
* @ep: endpoint
|
|
* @req: request handled
|
|
*
|
|
* Caller must release lock. Put the port in test mode if test mode
|
|
* feature is selected.
|
|
*/
|
|
static void
|
|
isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
struct ci_hdrc *ci = req->context;
|
|
unsigned long flags;
|
|
|
|
if (ci->setaddr) {
|
|
hw_usb_set_address(ci, ci->address);
|
|
ci->setaddr = false;
|
|
if (ci->address)
|
|
usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
|
|
}
|
|
|
|
spin_lock_irqsave(&ci->lock, flags);
|
|
if (ci->test_mode)
|
|
hw_port_test_set(ci, ci->test_mode);
|
|
spin_unlock_irqrestore(&ci->lock, flags);
|
|
}
|
|
|
|
/**
|
|
* isr_setup_status_phase: queues the status phase of a setup transation
|
|
* @ci: ci struct
|
|
*
|
|
* This function returns an error code
|
|
*/
|
|
static int isr_setup_status_phase(struct ci_hdrc *ci)
|
|
{
|
|
int retval;
|
|
struct ci_hw_ep *hwep;
|
|
|
|
hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
|
|
ci->status->context = ci;
|
|
ci->status->complete = isr_setup_status_complete;
|
|
|
|
retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* isr_tr_complete_low: transaction complete low level handler
|
|
* @hwep: endpoint
|
|
*
|
|
* This function returns an error code
|
|
* Caller must hold lock
|
|
*/
|
|
static int isr_tr_complete_low(struct ci_hw_ep *hwep)
|
|
__releases(hwep->lock)
|
|
__acquires(hwep->lock)
|
|
{
|
|
struct ci_hw_req *hwreq, *hwreqtemp;
|
|
struct ci_hw_ep *hweptemp = hwep;
|
|
int retval = 0;
|
|
|
|
list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
|
|
queue) {
|
|
retval = _hardware_dequeue(hwep, hwreq);
|
|
if (retval < 0)
|
|
break;
|
|
list_del_init(&hwreq->queue);
|
|
if (hwreq->req.complete != NULL) {
|
|
spin_unlock(hwep->lock);
|
|
if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
|
|
hwreq->req.length)
|
|
hweptemp = hwep->ci->ep0in;
|
|
usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
|
|
spin_lock(hwep->lock);
|
|
}
|
|
}
|
|
|
|
if (retval == -EBUSY)
|
|
retval = 0;
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
|
|
{
|
|
dev_warn(&ci->gadget.dev,
|
|
"connect the device to an alternate port if you want HNP\n");
|
|
return isr_setup_status_phase(ci);
|
|
}
|
|
|
|
/**
|
|
* isr_setup_packet_handler: setup packet handler
|
|
* @ci: UDC descriptor
|
|
*
|
|
* This function handles setup packet
|
|
*/
|
|
static void isr_setup_packet_handler(struct ci_hdrc *ci)
|
|
__releases(ci->lock)
|
|
__acquires(ci->lock)
|
|
{
|
|
struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
|
|
struct usb_ctrlrequest req;
|
|
int type, num, dir, err = -EINVAL;
|
|
u8 tmode = 0;
|
|
|
|
/*
|
|
* Flush data and handshake transactions of previous
|
|
* setup packet.
|
|
*/
|
|
_ep_nuke(ci->ep0out);
|
|
_ep_nuke(ci->ep0in);
|
|
|
|
/* read_setup_packet */
|
|
do {
|
|
hw_test_and_set_setup_guard(ci);
|
|
memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
|
|
} while (!hw_test_and_clear_setup_guard(ci));
|
|
|
|
type = req.bRequestType;
|
|
|
|
ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
|
|
|
|
switch (req.bRequest) {
|
|
case USB_REQ_CLEAR_FEATURE:
|
|
if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
|
|
le16_to_cpu(req.wValue) ==
|
|
USB_ENDPOINT_HALT) {
|
|
if (req.wLength != 0)
|
|
break;
|
|
num = le16_to_cpu(req.wIndex);
|
|
dir = num & USB_ENDPOINT_DIR_MASK;
|
|
num &= USB_ENDPOINT_NUMBER_MASK;
|
|
if (dir) /* TX */
|
|
num += ci->hw_ep_max / 2;
|
|
if (!ci->ci_hw_ep[num].wedge) {
|
|
spin_unlock(&ci->lock);
|
|
err = usb_ep_clear_halt(
|
|
&ci->ci_hw_ep[num].ep);
|
|
spin_lock(&ci->lock);
|
|
if (err)
|
|
break;
|
|
}
|
|
err = isr_setup_status_phase(ci);
|
|
} else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
|
|
le16_to_cpu(req.wValue) ==
|
|
USB_DEVICE_REMOTE_WAKEUP) {
|
|
if (req.wLength != 0)
|
|
break;
|
|
ci->remote_wakeup = 0;
|
|
err = isr_setup_status_phase(ci);
|
|
} else {
|
|
goto delegate;
|
|
}
|
|
break;
|
|
case USB_REQ_GET_STATUS:
|
|
if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
|
|
le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
|
|
type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
|
|
type != (USB_DIR_IN|USB_RECIP_INTERFACE))
|
|
goto delegate;
|
|
if (le16_to_cpu(req.wLength) != 2 ||
|
|
le16_to_cpu(req.wValue) != 0)
|
|
break;
|
|
err = isr_get_status_response(ci, &req);
|
|
break;
|
|
case USB_REQ_SET_ADDRESS:
|
|
if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
|
|
goto delegate;
|
|
if (le16_to_cpu(req.wLength) != 0 ||
|
|
le16_to_cpu(req.wIndex) != 0)
|
|
break;
|
|
ci->address = (u8)le16_to_cpu(req.wValue);
|
|
ci->setaddr = true;
|
|
err = isr_setup_status_phase(ci);
|
|
break;
|
|
case USB_REQ_SET_FEATURE:
|
|
if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
|
|
le16_to_cpu(req.wValue) ==
|
|
USB_ENDPOINT_HALT) {
|
|
if (req.wLength != 0)
|
|
break;
|
|
num = le16_to_cpu(req.wIndex);
|
|
dir = num & USB_ENDPOINT_DIR_MASK;
|
|
num &= USB_ENDPOINT_NUMBER_MASK;
|
|
if (dir) /* TX */
|
|
num += ci->hw_ep_max / 2;
|
|
|
|
spin_unlock(&ci->lock);
|
|
err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
|
|
spin_lock(&ci->lock);
|
|
if (!err)
|
|
isr_setup_status_phase(ci);
|
|
} else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
|
|
if (req.wLength != 0)
|
|
break;
|
|
switch (le16_to_cpu(req.wValue)) {
|
|
case USB_DEVICE_REMOTE_WAKEUP:
|
|
ci->remote_wakeup = 1;
|
|
err = isr_setup_status_phase(ci);
|
|
break;
|
|
case USB_DEVICE_TEST_MODE:
|
|
tmode = le16_to_cpu(req.wIndex) >> 8;
|
|
switch (tmode) {
|
|
case TEST_J:
|
|
case TEST_K:
|
|
case TEST_SE0_NAK:
|
|
case TEST_PACKET:
|
|
case TEST_FORCE_EN:
|
|
ci->test_mode = tmode;
|
|
err = isr_setup_status_phase(
|
|
ci);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case USB_DEVICE_B_HNP_ENABLE:
|
|
if (ci_otg_is_fsm_mode(ci)) {
|
|
ci->gadget.b_hnp_enable = 1;
|
|
err = isr_setup_status_phase(
|
|
ci);
|
|
}
|
|
break;
|
|
case USB_DEVICE_A_ALT_HNP_SUPPORT:
|
|
if (ci_otg_is_fsm_mode(ci))
|
|
err = otg_a_alt_hnp_support(ci);
|
|
break;
|
|
case USB_DEVICE_A_HNP_SUPPORT:
|
|
if (ci_otg_is_fsm_mode(ci)) {
|
|
ci->gadget.a_hnp_support = 1;
|
|
err = isr_setup_status_phase(
|
|
ci);
|
|
}
|
|
break;
|
|
default:
|
|
goto delegate;
|
|
}
|
|
} else {
|
|
goto delegate;
|
|
}
|
|
break;
|
|
default:
|
|
delegate:
|
|
if (req.wLength == 0) /* no data phase */
|
|
ci->ep0_dir = TX;
|
|
|
|
spin_unlock(&ci->lock);
|
|
err = ci->driver->setup(&ci->gadget, &req);
|
|
spin_lock(&ci->lock);
|
|
break;
|
|
}
|
|
|
|
if (err < 0) {
|
|
spin_unlock(&ci->lock);
|
|
if (_ep_set_halt(&hwep->ep, 1, false))
|
|
dev_err(ci->dev, "error: _ep_set_halt\n");
|
|
spin_lock(&ci->lock);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* isr_tr_complete_handler: transaction complete interrupt handler
|
|
* @ci: UDC descriptor
|
|
*
|
|
* This function handles traffic events
|
|
*/
|
|
static void isr_tr_complete_handler(struct ci_hdrc *ci)
|
|
__releases(ci->lock)
|
|
__acquires(ci->lock)
|
|
{
|
|
unsigned i;
|
|
int err;
|
|
|
|
for (i = 0; i < ci->hw_ep_max; i++) {
|
|
struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
|
|
|
|
if (hwep->ep.desc == NULL)
|
|
continue; /* not configured */
|
|
|
|
if (hw_test_and_clear_complete(ci, i)) {
|
|
err = isr_tr_complete_low(hwep);
|
|
if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
|
|
if (err > 0) /* needs status phase */
|
|
err = isr_setup_status_phase(ci);
|
|
if (err < 0) {
|
|
spin_unlock(&ci->lock);
|
|
if (_ep_set_halt(&hwep->ep, 1, false))
|
|
dev_err(ci->dev,
|
|
"error: _ep_set_halt\n");
|
|
spin_lock(&ci->lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Only handle setup packet below */
|
|
if (i == 0 &&
|
|
hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
|
|
isr_setup_packet_handler(ci);
|
|
}
|
|
}
|
|
|
|
/******************************************************************************
|
|
* ENDPT block
|
|
*****************************************************************************/
|
|
/**
|
|
* ep_enable: configure endpoint, making it usable
|
|
*
|
|
* Check usb_ep_enable() at "usb_gadget.h" for details
|
|
*/
|
|
static int ep_enable(struct usb_ep *ep,
|
|
const struct usb_endpoint_descriptor *desc)
|
|
{
|
|
struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
|
|
int retval = 0;
|
|
unsigned long flags;
|
|
u32 cap = 0;
|
|
|
|
if (ep == NULL || desc == NULL)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(hwep->lock, flags);
|
|
|
|
/* only internal SW should enable ctrl endpts */
|
|
|
|
if (!list_empty(&hwep->qh.queue)) {
|
|
dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
return -EBUSY;
|
|
}
|
|
|
|
hwep->ep.desc = desc;
|
|
|
|
hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
|
|
hwep->num = usb_endpoint_num(desc);
|
|
hwep->type = usb_endpoint_type(desc);
|
|
|
|
hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
|
|
hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
|
|
|
|
if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
|
|
cap |= QH_IOS;
|
|
|
|
cap |= QH_ZLT;
|
|
cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
|
|
/*
|
|
* For ISO-TX, we set mult at QH as the largest value, and use
|
|
* MultO at TD as real mult value.
|
|
*/
|
|
if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
|
|
cap |= 3 << __ffs(QH_MULT);
|
|
|
|
hwep->qh.ptr->cap = cpu_to_le32(cap);
|
|
|
|
hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
|
|
|
|
if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
|
|
dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
|
|
retval = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Enable endpoints in the HW other than ep0 as ep0
|
|
* is always enabled
|
|
*/
|
|
if (hwep->num)
|
|
retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
|
|
hwep->type);
|
|
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* ep_disable: endpoint is no longer usable
|
|
*
|
|
* Check usb_ep_disable() at "usb_gadget.h" for details
|
|
*/
|
|
static int ep_disable(struct usb_ep *ep)
|
|
{
|
|
struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
|
|
int direction, retval = 0;
|
|
unsigned long flags;
|
|
|
|
if (ep == NULL)
|
|
return -EINVAL;
|
|
else if (hwep->ep.desc == NULL)
|
|
return -EBUSY;
|
|
|
|
spin_lock_irqsave(hwep->lock, flags);
|
|
|
|
/* only internal SW should disable ctrl endpts */
|
|
|
|
direction = hwep->dir;
|
|
do {
|
|
retval |= _ep_nuke(hwep);
|
|
retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
|
|
|
|
if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
|
|
hwep->dir = (hwep->dir == TX) ? RX : TX;
|
|
|
|
} while (hwep->dir != direction);
|
|
|
|
hwep->ep.desc = NULL;
|
|
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* ep_alloc_request: allocate a request object to use with this endpoint
|
|
*
|
|
* Check usb_ep_alloc_request() at "usb_gadget.h" for details
|
|
*/
|
|
static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
|
|
{
|
|
struct ci_hw_req *hwreq = NULL;
|
|
|
|
if (ep == NULL)
|
|
return NULL;
|
|
|
|
hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
|
|
if (hwreq != NULL) {
|
|
INIT_LIST_HEAD(&hwreq->queue);
|
|
INIT_LIST_HEAD(&hwreq->tds);
|
|
}
|
|
|
|
return (hwreq == NULL) ? NULL : &hwreq->req;
|
|
}
|
|
|
|
/**
|
|
* ep_free_request: frees a request object
|
|
*
|
|
* Check usb_ep_free_request() at "usb_gadget.h" for details
|
|
*/
|
|
static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
|
|
struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
|
|
struct td_node *node, *tmpnode;
|
|
unsigned long flags;
|
|
|
|
if (ep == NULL || req == NULL) {
|
|
return;
|
|
} else if (!list_empty(&hwreq->queue)) {
|
|
dev_err(hwep->ci->dev, "freeing queued request\n");
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(hwep->lock, flags);
|
|
|
|
list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
|
|
dma_pool_free(hwep->td_pool, node->ptr, node->dma);
|
|
list_del_init(&node->td);
|
|
node->ptr = NULL;
|
|
kfree(node);
|
|
}
|
|
|
|
kfree(hwreq);
|
|
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
}
|
|
|
|
/**
|
|
* ep_queue: queues (submits) an I/O request to an endpoint
|
|
*
|
|
* Check usb_ep_queue()* at usb_gadget.h" for details
|
|
*/
|
|
static int ep_queue(struct usb_ep *ep, struct usb_request *req,
|
|
gfp_t __maybe_unused gfp_flags)
|
|
{
|
|
struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
|
|
int retval = 0;
|
|
unsigned long flags;
|
|
|
|
if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(hwep->lock, flags);
|
|
retval = _ep_queue(ep, req, gfp_flags);
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
|
|
*
|
|
* Check usb_ep_dequeue() at "usb_gadget.h" for details
|
|
*/
|
|
static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
|
|
struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
|
|
unsigned long flags;
|
|
struct td_node *node, *tmpnode;
|
|
|
|
if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
|
|
hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
|
|
list_empty(&hwep->qh.queue))
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(hwep->lock, flags);
|
|
|
|
hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
|
|
|
|
list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
|
|
dma_pool_free(hwep->td_pool, node->ptr, node->dma);
|
|
list_del(&node->td);
|
|
kfree(node);
|
|
}
|
|
|
|
/* pop request */
|
|
list_del_init(&hwreq->queue);
|
|
|
|
usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
|
|
|
|
req->status = -ECONNRESET;
|
|
|
|
if (hwreq->req.complete != NULL) {
|
|
spin_unlock(hwep->lock);
|
|
usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
|
|
spin_lock(hwep->lock);
|
|
}
|
|
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ep_set_halt: sets the endpoint halt feature
|
|
*
|
|
* Check usb_ep_set_halt() at "usb_gadget.h" for details
|
|
*/
|
|
static int ep_set_halt(struct usb_ep *ep, int value)
|
|
{
|
|
return _ep_set_halt(ep, value, true);
|
|
}
|
|
|
|
/**
|
|
* ep_set_wedge: sets the halt feature and ignores clear requests
|
|
*
|
|
* Check usb_ep_set_wedge() at "usb_gadget.h" for details
|
|
*/
|
|
static int ep_set_wedge(struct usb_ep *ep)
|
|
{
|
|
struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
|
|
unsigned long flags;
|
|
|
|
if (ep == NULL || hwep->ep.desc == NULL)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(hwep->lock, flags);
|
|
hwep->wedge = 1;
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
|
|
return usb_ep_set_halt(ep);
|
|
}
|
|
|
|
/**
|
|
* ep_fifo_flush: flushes contents of a fifo
|
|
*
|
|
* Check usb_ep_fifo_flush() at "usb_gadget.h" for details
|
|
*/
|
|
static void ep_fifo_flush(struct usb_ep *ep)
|
|
{
|
|
struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
|
|
unsigned long flags;
|
|
|
|
if (ep == NULL) {
|
|
dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(hwep->lock, flags);
|
|
|
|
hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
|
|
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
}
|
|
|
|
/**
|
|
* Endpoint-specific part of the API to the USB controller hardware
|
|
* Check "usb_gadget.h" for details
|
|
*/
|
|
static const struct usb_ep_ops usb_ep_ops = {
|
|
.enable = ep_enable,
|
|
.disable = ep_disable,
|
|
.alloc_request = ep_alloc_request,
|
|
.free_request = ep_free_request,
|
|
.queue = ep_queue,
|
|
.dequeue = ep_dequeue,
|
|
.set_halt = ep_set_halt,
|
|
.set_wedge = ep_set_wedge,
|
|
.fifo_flush = ep_fifo_flush,
|
|
};
|
|
|
|
/******************************************************************************
|
|
* GADGET block
|
|
*****************************************************************************/
|
|
static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
|
|
{
|
|
struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
|
|
unsigned long flags;
|
|
int gadget_ready = 0;
|
|
|
|
spin_lock_irqsave(&ci->lock, flags);
|
|
ci->vbus_active = is_active;
|
|
if (ci->driver)
|
|
gadget_ready = 1;
|
|
spin_unlock_irqrestore(&ci->lock, flags);
|
|
|
|
if (gadget_ready) {
|
|
if (is_active) {
|
|
pm_runtime_get_sync(&_gadget->dev);
|
|
hw_device_reset(ci);
|
|
hw_device_state(ci, ci->ep0out->qh.dma);
|
|
usb_gadget_set_state(_gadget, USB_STATE_POWERED);
|
|
usb_udc_vbus_handler(_gadget, true);
|
|
} else {
|
|
usb_udc_vbus_handler(_gadget, false);
|
|
if (ci->driver)
|
|
ci->driver->disconnect(&ci->gadget);
|
|
hw_device_state(ci, 0);
|
|
if (ci->platdata->notify_event)
|
|
ci->platdata->notify_event(ci,
|
|
CI_HDRC_CONTROLLER_STOPPED_EVENT);
|
|
_gadget_stop_activity(&ci->gadget);
|
|
pm_runtime_put_sync(&_gadget->dev);
|
|
usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ci_udc_wakeup(struct usb_gadget *_gadget)
|
|
{
|
|
struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
spin_lock_irqsave(&ci->lock, flags);
|
|
if (!ci->remote_wakeup) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
|
|
out:
|
|
spin_unlock_irqrestore(&ci->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
|
|
{
|
|
struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
|
|
|
|
if (ci->usb_phy)
|
|
return usb_phy_set_power(ci->usb_phy, ma);
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
|
|
{
|
|
struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
|
|
struct ci_hw_ep *hwep = ci->ep0in;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(hwep->lock, flags);
|
|
_gadget->is_selfpowered = (is_on != 0);
|
|
spin_unlock_irqrestore(hwep->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Change Data+ pullup status
|
|
* this func is used by usb_gadget_connect/disconnet
|
|
*/
|
|
static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
|
|
{
|
|
struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
|
|
|
|
/* Data+ pullup controlled by OTG state machine in OTG fsm mode */
|
|
if (ci_otg_is_fsm_mode(ci))
|
|
return 0;
|
|
|
|
pm_runtime_get_sync(&ci->gadget.dev);
|
|
if (is_on)
|
|
hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
|
|
else
|
|
hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
|
|
pm_runtime_put_sync(&ci->gadget.dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ci_udc_start(struct usb_gadget *gadget,
|
|
struct usb_gadget_driver *driver);
|
|
static int ci_udc_stop(struct usb_gadget *gadget);
|
|
/**
|
|
* Device operations part of the API to the USB controller hardware,
|
|
* which don't involve endpoints (or i/o)
|
|
* Check "usb_gadget.h" for details
|
|
*/
|
|
static const struct usb_gadget_ops usb_gadget_ops = {
|
|
.vbus_session = ci_udc_vbus_session,
|
|
.wakeup = ci_udc_wakeup,
|
|
.set_selfpowered = ci_udc_selfpowered,
|
|
.pullup = ci_udc_pullup,
|
|
.vbus_draw = ci_udc_vbus_draw,
|
|
.udc_start = ci_udc_start,
|
|
.udc_stop = ci_udc_stop,
|
|
};
|
|
|
|
static int init_eps(struct ci_hdrc *ci)
|
|
{
|
|
int retval = 0, i, j;
|
|
|
|
for (i = 0; i < ci->hw_ep_max/2; i++)
|
|
for (j = RX; j <= TX; j++) {
|
|
int k = i + j * ci->hw_ep_max/2;
|
|
struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
|
|
|
|
scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
|
|
(j == TX) ? "in" : "out");
|
|
|
|
hwep->ci = ci;
|
|
hwep->lock = &ci->lock;
|
|
hwep->td_pool = ci->td_pool;
|
|
|
|
hwep->ep.name = hwep->name;
|
|
hwep->ep.ops = &usb_ep_ops;
|
|
|
|
if (i == 0) {
|
|
hwep->ep.caps.type_control = true;
|
|
} else {
|
|
hwep->ep.caps.type_iso = true;
|
|
hwep->ep.caps.type_bulk = true;
|
|
hwep->ep.caps.type_int = true;
|
|
}
|
|
|
|
if (j == TX)
|
|
hwep->ep.caps.dir_in = true;
|
|
else
|
|
hwep->ep.caps.dir_out = true;
|
|
|
|
/*
|
|
* for ep0: maxP defined in desc, for other
|
|
* eps, maxP is set by epautoconfig() called
|
|
* by gadget layer
|
|
*/
|
|
usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
|
|
|
|
INIT_LIST_HEAD(&hwep->qh.queue);
|
|
hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
|
|
&hwep->qh.dma);
|
|
if (hwep->qh.ptr == NULL)
|
|
retval = -ENOMEM;
|
|
else
|
|
memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
|
|
|
|
/*
|
|
* set up shorthands for ep0 out and in endpoints,
|
|
* don't add to gadget's ep_list
|
|
*/
|
|
if (i == 0) {
|
|
if (j == RX)
|
|
ci->ep0out = hwep;
|
|
else
|
|
ci->ep0in = hwep;
|
|
|
|
usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
|
|
continue;
|
|
}
|
|
|
|
list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void destroy_eps(struct ci_hdrc *ci)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ci->hw_ep_max; i++) {
|
|
struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
|
|
|
|
if (hwep->pending_td)
|
|
free_pending_td(hwep);
|
|
dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ci_udc_start: register a gadget driver
|
|
* @gadget: our gadget
|
|
* @driver: the driver being registered
|
|
*
|
|
* Interrupts are enabled here.
|
|
*/
|
|
static int ci_udc_start(struct usb_gadget *gadget,
|
|
struct usb_gadget_driver *driver)
|
|
{
|
|
struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
|
|
unsigned long flags;
|
|
int retval = -ENOMEM;
|
|
|
|
if (driver->disconnect == NULL)
|
|
return -EINVAL;
|
|
|
|
|
|
ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
|
|
retval = usb_ep_enable(&ci->ep0out->ep);
|
|
if (retval)
|
|
return retval;
|
|
|
|
ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
|
|
retval = usb_ep_enable(&ci->ep0in->ep);
|
|
if (retval)
|
|
return retval;
|
|
|
|
ci->driver = driver;
|
|
|
|
/* Start otg fsm for B-device */
|
|
if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
|
|
ci_hdrc_otg_fsm_start(ci);
|
|
return retval;
|
|
}
|
|
|
|
pm_runtime_get_sync(&ci->gadget.dev);
|
|
if (ci->vbus_active) {
|
|
spin_lock_irqsave(&ci->lock, flags);
|
|
hw_device_reset(ci);
|
|
} else {
|
|
usb_udc_vbus_handler(&ci->gadget, false);
|
|
pm_runtime_put_sync(&ci->gadget.dev);
|
|
return retval;
|
|
}
|
|
|
|
retval = hw_device_state(ci, ci->ep0out->qh.dma);
|
|
spin_unlock_irqrestore(&ci->lock, flags);
|
|
if (retval)
|
|
pm_runtime_put_sync(&ci->gadget.dev);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
|
|
{
|
|
if (!ci_otg_is_fsm_mode(ci))
|
|
return;
|
|
|
|
mutex_lock(&ci->fsm.lock);
|
|
if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
|
|
ci->fsm.a_bidl_adis_tmout = 1;
|
|
ci_hdrc_otg_fsm_start(ci);
|
|
} else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
|
|
ci->fsm.protocol = PROTO_UNDEF;
|
|
ci->fsm.otg->state = OTG_STATE_UNDEFINED;
|
|
}
|
|
mutex_unlock(&ci->fsm.lock);
|
|
}
|
|
|
|
/**
|
|
* ci_udc_stop: unregister a gadget driver
|
|
*/
|
|
static int ci_udc_stop(struct usb_gadget *gadget)
|
|
{
|
|
struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ci->lock, flags);
|
|
|
|
if (ci->vbus_active) {
|
|
hw_device_state(ci, 0);
|
|
if (ci->platdata->notify_event)
|
|
ci->platdata->notify_event(ci,
|
|
CI_HDRC_CONTROLLER_STOPPED_EVENT);
|
|
spin_unlock_irqrestore(&ci->lock, flags);
|
|
_gadget_stop_activity(&ci->gadget);
|
|
spin_lock_irqsave(&ci->lock, flags);
|
|
pm_runtime_put(&ci->gadget.dev);
|
|
}
|
|
|
|
ci->driver = NULL;
|
|
spin_unlock_irqrestore(&ci->lock, flags);
|
|
|
|
ci_udc_stop_for_otg_fsm(ci);
|
|
return 0;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* BUS block
|
|
*****************************************************************************/
|
|
/**
|
|
* udc_irq: ci interrupt handler
|
|
*
|
|
* This function returns IRQ_HANDLED if the IRQ has been handled
|
|
* It locks access to registers
|
|
*/
|
|
static irqreturn_t udc_irq(struct ci_hdrc *ci)
|
|
{
|
|
irqreturn_t retval;
|
|
u32 intr;
|
|
|
|
if (ci == NULL)
|
|
return IRQ_HANDLED;
|
|
|
|
spin_lock(&ci->lock);
|
|
|
|
if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
|
|
if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
|
|
USBMODE_CM_DC) {
|
|
spin_unlock(&ci->lock);
|
|
return IRQ_NONE;
|
|
}
|
|
}
|
|
intr = hw_test_and_clear_intr_active(ci);
|
|
|
|
if (intr) {
|
|
/* order defines priority - do NOT change it */
|
|
if (USBi_URI & intr)
|
|
isr_reset_handler(ci);
|
|
|
|
if (USBi_PCI & intr) {
|
|
ci->gadget.speed = hw_port_is_high_speed(ci) ?
|
|
USB_SPEED_HIGH : USB_SPEED_FULL;
|
|
if (ci->suspended && ci->driver->resume) {
|
|
spin_unlock(&ci->lock);
|
|
ci->driver->resume(&ci->gadget);
|
|
spin_lock(&ci->lock);
|
|
ci->suspended = 0;
|
|
}
|
|
}
|
|
|
|
if (USBi_UI & intr)
|
|
isr_tr_complete_handler(ci);
|
|
|
|
if (USBi_SLI & intr) {
|
|
if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
|
|
ci->driver->suspend) {
|
|
ci->suspended = 1;
|
|
spin_unlock(&ci->lock);
|
|
ci->driver->suspend(&ci->gadget);
|
|
usb_gadget_set_state(&ci->gadget,
|
|
USB_STATE_SUSPENDED);
|
|
spin_lock(&ci->lock);
|
|
}
|
|
}
|
|
retval = IRQ_HANDLED;
|
|
} else {
|
|
retval = IRQ_NONE;
|
|
}
|
|
spin_unlock(&ci->lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* udc_start: initialize gadget role
|
|
* @ci: chipidea controller
|
|
*/
|
|
static int udc_start(struct ci_hdrc *ci)
|
|
{
|
|
struct device *dev = ci->dev;
|
|
struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
|
|
int retval = 0;
|
|
|
|
spin_lock_init(&ci->lock);
|
|
|
|
ci->gadget.ops = &usb_gadget_ops;
|
|
ci->gadget.speed = USB_SPEED_UNKNOWN;
|
|
ci->gadget.max_speed = USB_SPEED_HIGH;
|
|
ci->gadget.name = ci->platdata->name;
|
|
ci->gadget.otg_caps = otg_caps;
|
|
|
|
if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
|
|
otg_caps->adp_support))
|
|
ci->gadget.is_otg = 1;
|
|
|
|
INIT_LIST_HEAD(&ci->gadget.ep_list);
|
|
|
|
/* alloc resources */
|
|
ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
|
|
sizeof(struct ci_hw_qh),
|
|
64, CI_HDRC_PAGE_SIZE);
|
|
if (ci->qh_pool == NULL)
|
|
return -ENOMEM;
|
|
|
|
ci->td_pool = dma_pool_create("ci_hw_td", dev,
|
|
sizeof(struct ci_hw_td),
|
|
64, CI_HDRC_PAGE_SIZE);
|
|
if (ci->td_pool == NULL) {
|
|
retval = -ENOMEM;
|
|
goto free_qh_pool;
|
|
}
|
|
|
|
retval = init_eps(ci);
|
|
if (retval)
|
|
goto free_pools;
|
|
|
|
ci->gadget.ep0 = &ci->ep0in->ep;
|
|
|
|
retval = usb_add_gadget_udc(dev, &ci->gadget);
|
|
if (retval)
|
|
goto destroy_eps;
|
|
|
|
pm_runtime_no_callbacks(&ci->gadget.dev);
|
|
pm_runtime_enable(&ci->gadget.dev);
|
|
|
|
return retval;
|
|
|
|
destroy_eps:
|
|
destroy_eps(ci);
|
|
free_pools:
|
|
dma_pool_destroy(ci->td_pool);
|
|
free_qh_pool:
|
|
dma_pool_destroy(ci->qh_pool);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
|
|
*
|
|
* No interrupts active, the IRQ has been released
|
|
*/
|
|
void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
|
|
{
|
|
if (!ci->roles[CI_ROLE_GADGET])
|
|
return;
|
|
|
|
usb_del_gadget_udc(&ci->gadget);
|
|
|
|
destroy_eps(ci);
|
|
|
|
dma_pool_destroy(ci->td_pool);
|
|
dma_pool_destroy(ci->qh_pool);
|
|
}
|
|
|
|
static int udc_id_switch_for_device(struct ci_hdrc *ci)
|
|
{
|
|
if (ci->is_otg)
|
|
/* Clear and enable BSV irq */
|
|
hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
|
|
OTGSC_BSVIS | OTGSC_BSVIE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void udc_id_switch_for_host(struct ci_hdrc *ci)
|
|
{
|
|
/*
|
|
* host doesn't care B_SESSION_VALID event
|
|
* so clear and disbale BSV irq
|
|
*/
|
|
if (ci->is_otg)
|
|
hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
|
|
}
|
|
|
|
/**
|
|
* ci_hdrc_gadget_init - initialize device related bits
|
|
* ci: the controller
|
|
*
|
|
* This function initializes the gadget, if the device is "device capable".
|
|
*/
|
|
int ci_hdrc_gadget_init(struct ci_hdrc *ci)
|
|
{
|
|
struct ci_role_driver *rdrv;
|
|
|
|
if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
|
|
return -ENXIO;
|
|
|
|
rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
|
|
if (!rdrv)
|
|
return -ENOMEM;
|
|
|
|
rdrv->start = udc_id_switch_for_device;
|
|
rdrv->stop = udc_id_switch_for_host;
|
|
rdrv->irq = udc_irq;
|
|
rdrv->name = "gadget";
|
|
ci->roles[CI_ROLE_GADGET] = rdrv;
|
|
|
|
return udc_start(ci);
|
|
}
|