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kernel/drivers/usb/chipidea/udc.c
Xu Yang 4726347825 usb: chipidea: udc: improve error recovery for ISO transfer 
Impove device mode ISO transfer error tolerant by reprime the corresponding
endpoint.

The recovery steps when error occurs:
- Delete the error dTD from dQH and giveback request to user.
- Do reprime if dQH is not empty.
- Do prime when new dTD is queued if dQH is empty

Acked-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20240926022906.473319-3-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-10-04 15:14:09 +02:00

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// SPDX-License-Identifier: GPL-2.0
/*
* udc.c - ChipIdea UDC driver
*
* Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
*
* Author: David Lopo
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dmapool.h>
#include <linux/dma-direct.h>
#include <linux/err.h>
#include <linux/irqreturn.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/pinctrl/consumer.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg-fsm.h>
#include <linux/usb/chipidea.h>
#include "ci.h"
#include "udc.h"
#include "bits.h"
#include "otg.h"
#include "otg_fsm.h"
#include "trace.h"
/* control endpoint description */
static const struct usb_endpoint_descriptor
ctrl_endpt_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
.wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
};
static const struct usb_endpoint_descriptor
ctrl_endpt_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
.wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
};
static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
struct td_node *node);
/**
* hw_ep_bit: calculates the bit number
* @num: endpoint number
* @dir: endpoint direction
*
* This function returns bit number
*/
static inline int hw_ep_bit(int num, int dir)
{
return num + ((dir == TX) ? 16 : 0);
}
static inline int ep_to_bit(struct ci_hdrc *ci, int n)
{
int fill = 16 - ci->hw_ep_max / 2;
if (n >= ci->hw_ep_max / 2)
n += fill;
return n;
}
/**
* hw_device_state: enables/disables interrupts (execute without interruption)
* @ci: the controller
* @dma: 0 => disable, !0 => enable and set dma engine
*
* This function returns an error code
*/
static int hw_device_state(struct ci_hdrc *ci, u32 dma)
{
if (dma) {
hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
/* interrupt, error, port change, reset, sleep/suspend */
hw_write(ci, OP_USBINTR, ~0,
USBi_UI|USBi_UEI|USBi_PCI|USBi_URI);
} else {
hw_write(ci, OP_USBINTR, ~0, 0);
}
return 0;
}
/**
* hw_ep_flush: flush endpoint fifo (execute without interruption)
* @ci: the controller
* @num: endpoint number
* @dir: endpoint direction
*
* This function returns an error code
*/
static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
{
int n = hw_ep_bit(num, dir);
do {
/* flush any pending transfer */
hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
cpu_relax();
} while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
return 0;
}
/**
* hw_ep_disable: disables endpoint (execute without interruption)
* @ci: the controller
* @num: endpoint number
* @dir: endpoint direction
*
* This function returns an error code
*/
static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
{
hw_write(ci, OP_ENDPTCTRL + num,
(dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
return 0;
}
/**
* hw_ep_enable: enables endpoint (execute without interruption)
* @ci: the controller
* @num: endpoint number
* @dir: endpoint direction
* @type: endpoint type
*
* This function returns an error code
*/
static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
{
u32 mask, data;
if (dir == TX) {
mask = ENDPTCTRL_TXT; /* type */
data = type << __ffs(mask);
mask |= ENDPTCTRL_TXS; /* unstall */
mask |= ENDPTCTRL_TXR; /* reset data toggle */
data |= ENDPTCTRL_TXR;
mask |= ENDPTCTRL_TXE; /* enable */
data |= ENDPTCTRL_TXE;
} else {
mask = ENDPTCTRL_RXT; /* type */
data = type << __ffs(mask);
mask |= ENDPTCTRL_RXS; /* unstall */
mask |= ENDPTCTRL_RXR; /* reset data toggle */
data |= ENDPTCTRL_RXR;
mask |= ENDPTCTRL_RXE; /* enable */
data |= ENDPTCTRL_RXE;
}
hw_write(ci, OP_ENDPTCTRL + num, mask, data);
return 0;
}
/**
* hw_ep_get_halt: return endpoint halt status
* @ci: the controller
* @num: endpoint number
* @dir: endpoint direction
*
* This function returns 1 if endpoint halted
*/
static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
{
u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
}
/**
* hw_ep_prime: primes endpoint (execute without interruption)
* @ci: the controller
* @num: endpoint number
* @dir: endpoint direction
* @is_ctrl: true if control endpoint
*
* This function returns an error code
*/
static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
{
int n = hw_ep_bit(num, dir);
/* Synchronize before ep prime */
wmb();
if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
return -EAGAIN;
hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
cpu_relax();
if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
return -EAGAIN;
/* status shoult be tested according with manual but it doesn't work */
return 0;
}
/**
* hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
* without interruption)
* @ci: the controller
* @num: endpoint number
* @dir: endpoint direction
* @value: true => stall, false => unstall
*
* This function returns an error code
*/
static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
{
if (value != 0 && value != 1)
return -EINVAL;
do {
enum ci_hw_regs reg = OP_ENDPTCTRL + num;
u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
/* data toggle - reserved for EP0 but it's in ESS */
hw_write(ci, reg, mask_xs|mask_xr,
value ? mask_xs : mask_xr);
} while (value != hw_ep_get_halt(ci, num, dir));
return 0;
}
/**
* hw_port_is_high_speed: test if port is high speed
* @ci: the controller
*
* This function returns true if high speed port
*/
static int hw_port_is_high_speed(struct ci_hdrc *ci)
{
return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
hw_read(ci, OP_PORTSC, PORTSC_HSP);
}
/**
* hw_test_and_clear_complete: test & clear complete status (execute without
* interruption)
* @ci: the controller
* @n: endpoint number
*
* This function returns complete status
*/
static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
{
n = ep_to_bit(ci, n);
return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
}
/**
* hw_test_and_clear_intr_active: test & clear active interrupts (execute
* without interruption)
* @ci: the controller
*
* This function returns active interrutps
*/
static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
{
u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
hw_write(ci, OP_USBSTS, ~0, reg);
return reg;
}
/**
* hw_test_and_clear_setup_guard: test & clear setup guard (execute without
* interruption)
* @ci: the controller
*
* This function returns guard value
*/
static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
{
return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
}
/**
* hw_test_and_set_setup_guard: test & set setup guard (execute without
* interruption)
* @ci: the controller
*
* This function returns guard value
*/
static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
{
return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
}
/**
* hw_usb_set_address: configures USB address (execute without interruption)
* @ci: the controller
* @value: new USB address
*
* This function explicitly sets the address, without the "USBADRA" (advance)
* feature, which is not supported by older versions of the controller.
*/
static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
{
hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
value << __ffs(DEVICEADDR_USBADR));
}
/**
* hw_usb_reset: restart device after a bus reset (execute without
* interruption)
* @ci: the controller
*
* This function returns an error code
*/
static int hw_usb_reset(struct ci_hdrc *ci)
{
hw_usb_set_address(ci, 0);
/* ESS flushes only at end?!? */
hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
/* clear setup token semaphores */
hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
/* clear complete status */
hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
/* wait until all bits cleared */
while (hw_read(ci, OP_ENDPTPRIME, ~0))
udelay(10); /* not RTOS friendly */
/* reset all endpoints ? */
/* reset internal status and wait for further instructions
no need to verify the port reset status (ESS does it) */
return 0;
}
/******************************************************************************
* UTIL block
*****************************************************************************/
static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
unsigned int length, struct scatterlist *s)
{
int i;
u32 temp;
struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
GFP_ATOMIC);
if (node == NULL)
return -ENOMEM;
node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
if (node->ptr == NULL) {
kfree(node);
return -ENOMEM;
}
node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
u32 mul = hwreq->req.length / hwep->ep.maxpacket;
if (hwreq->req.length == 0
|| hwreq->req.length % hwep->ep.maxpacket)
mul++;
node->ptr->token |= cpu_to_le32(mul << __ffs(TD_MULTO));
}
if (s) {
temp = (u32) (sg_dma_address(s) + hwreq->req.actual);
node->td_remaining_size = CI_MAX_BUF_SIZE - length;
} else {
temp = (u32) (hwreq->req.dma + hwreq->req.actual);
}
if (length) {
node->ptr->page[0] = cpu_to_le32(temp);
for (i = 1; i < TD_PAGE_COUNT; i++) {
u32 page = temp + i * CI_HDRC_PAGE_SIZE;
page &= ~TD_RESERVED_MASK;
node->ptr->page[i] = cpu_to_le32(page);
}
}
hwreq->req.actual += length;
if (!list_empty(&hwreq->tds)) {
/* get the last entry */
lastnode = list_entry(hwreq->tds.prev,
struct td_node, td);
lastnode->ptr->next = cpu_to_le32(node->dma);
}
INIT_LIST_HEAD(&node->td);
list_add_tail(&node->td, &hwreq->tds);
return 0;
}
/**
* _usb_addr: calculates endpoint address from direction & number
* @ep: endpoint
*/
static inline u8 _usb_addr(struct ci_hw_ep *ep)
{
return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
}
static int prepare_td_for_non_sg(struct ci_hw_ep *hwep,
struct ci_hw_req *hwreq)
{
unsigned int rest = hwreq->req.length;
int pages = TD_PAGE_COUNT;
int ret = 0;
if (rest == 0) {
ret = add_td_to_list(hwep, hwreq, 0, NULL);
if (ret < 0)
return ret;
}
/*
* The first buffer could be not page aligned.
* In that case we have to span into one extra td.
*/
if (hwreq->req.dma % PAGE_SIZE)
pages--;
while (rest > 0) {
unsigned int count = min(hwreq->req.length - hwreq->req.actual,
(unsigned int)(pages * CI_HDRC_PAGE_SIZE));
ret = add_td_to_list(hwep, hwreq, count, NULL);
if (ret < 0)
return ret;
rest -= count;
}
if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
&& (hwreq->req.length % hwep->ep.maxpacket == 0)) {
ret = add_td_to_list(hwep, hwreq, 0, NULL);
if (ret < 0)
return ret;
}
return ret;
}
static int prepare_td_per_sg(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
struct scatterlist *s)
{
unsigned int rest = sg_dma_len(s);
int ret = 0;
hwreq->req.actual = 0;
while (rest > 0) {
unsigned int count = min_t(unsigned int, rest,
CI_MAX_BUF_SIZE);
ret = add_td_to_list(hwep, hwreq, count, s);
if (ret < 0)
return ret;
rest -= count;
}
return ret;
}
static void ci_add_buffer_entry(struct td_node *node, struct scatterlist *s)
{
int empty_td_slot_index = (CI_MAX_BUF_SIZE - node->td_remaining_size)
/ CI_HDRC_PAGE_SIZE;
int i;
u32 token;
token = le32_to_cpu(node->ptr->token) + (sg_dma_len(s) << __ffs(TD_TOTAL_BYTES));
node->ptr->token = cpu_to_le32(token);
for (i = empty_td_slot_index; i < TD_PAGE_COUNT; i++) {
u32 page = (u32) sg_dma_address(s) +
(i - empty_td_slot_index) * CI_HDRC_PAGE_SIZE;
page &= ~TD_RESERVED_MASK;
node->ptr->page[i] = cpu_to_le32(page);
}
}
static int prepare_td_for_sg(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
{
struct usb_request *req = &hwreq->req;
struct scatterlist *s = req->sg;
int ret = 0, i = 0;
struct td_node *node = NULL;
if (!s || req->zero || req->length == 0) {
dev_err(hwep->ci->dev, "not supported operation for sg\n");
return -EINVAL;
}
while (i++ < req->num_mapped_sgs) {
if (sg_dma_address(s) % PAGE_SIZE) {
dev_err(hwep->ci->dev, "not page aligned sg buffer\n");
return -EINVAL;
}
if (node && (node->td_remaining_size >= sg_dma_len(s))) {
ci_add_buffer_entry(node, s);
node->td_remaining_size -= sg_dma_len(s);
} else {
ret = prepare_td_per_sg(hwep, hwreq, s);
if (ret)
return ret;
node = list_entry(hwreq->tds.prev,
struct td_node, td);
}
s = sg_next(s);
}
return ret;
}
/*
* Verify if the scatterlist is valid by iterating each sg entry.
* Return invalid sg entry index which is less than num_sgs.
*/
static int sglist_get_invalid_entry(struct device *dma_dev, u8 dir,
struct usb_request *req)
{
int i;
struct scatterlist *s = req->sg;
if (req->num_sgs == 1)
return 1;
dir = dir ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
for (i = 0; i < req->num_sgs; i++, s = sg_next(s)) {
/* Only small sg (generally last sg) may be bounced. If
* that happens. we can't ensure the addr is page-aligned
* after dma map.
*/
if (dma_kmalloc_needs_bounce(dma_dev, s->length, dir))
break;
/* Make sure each sg start address (except first sg) is
* page-aligned and end address (except last sg) is also
* page-aligned.
*/
if (i == 0) {
if (!IS_ALIGNED(s->offset + s->length,
CI_HDRC_PAGE_SIZE))
break;
} else {
if (s->offset)
break;
if (!sg_is_last(s) && !IS_ALIGNED(s->length,
CI_HDRC_PAGE_SIZE))
break;
}
}
return i;
}
static int sglist_do_bounce(struct ci_hw_req *hwreq, int index,
bool copy, unsigned int *bounced)
{
void *buf;
int i, ret, nents, num_sgs;
unsigned int rest, rounded;
struct scatterlist *sg, *src, *dst;
nents = index + 1;
ret = sg_alloc_table(&hwreq->sgt, nents, GFP_KERNEL);
if (ret)
return ret;
sg = src = hwreq->req.sg;
num_sgs = hwreq->req.num_sgs;
rest = hwreq->req.length;
dst = hwreq->sgt.sgl;
for (i = 0; i < index; i++) {
memcpy(dst, src, sizeof(*src));
rest -= src->length;
src = sg_next(src);
dst = sg_next(dst);
}
/* create one bounce buffer */
rounded = round_up(rest, CI_HDRC_PAGE_SIZE);
buf = kmalloc(rounded, GFP_KERNEL);
if (!buf) {
sg_free_table(&hwreq->sgt);
return -ENOMEM;
}
sg_set_buf(dst, buf, rounded);
hwreq->req.sg = hwreq->sgt.sgl;
hwreq->req.num_sgs = nents;
hwreq->sgt.sgl = sg;
hwreq->sgt.nents = num_sgs;
if (copy)
sg_copy_to_buffer(src, num_sgs - index, buf, rest);
*bounced = rest;
return 0;
}
static void sglist_do_debounce(struct ci_hw_req *hwreq, bool copy)
{
void *buf;
int i, nents, num_sgs;
struct scatterlist *sg, *src, *dst;
sg = hwreq->req.sg;
num_sgs = hwreq->req.num_sgs;
src = sg_last(sg, num_sgs);
buf = sg_virt(src);
if (copy) {
dst = hwreq->sgt.sgl;
for (i = 0; i < num_sgs - 1; i++)
dst = sg_next(dst);
nents = hwreq->sgt.nents - num_sgs + 1;
sg_copy_from_buffer(dst, nents, buf, sg_dma_len(src));
}
hwreq->req.sg = hwreq->sgt.sgl;
hwreq->req.num_sgs = hwreq->sgt.nents;
hwreq->sgt.sgl = sg;
hwreq->sgt.nents = num_sgs;
kfree(buf);
sg_free_table(&hwreq->sgt);
}
/**
* _hardware_enqueue: configures a request at hardware level
* @hwep: endpoint
* @hwreq: request
*
* This function returns an error code
*/
static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
{
struct ci_hdrc *ci = hwep->ci;
int ret = 0;
struct td_node *firstnode, *lastnode;
unsigned int bounced_size;
struct scatterlist *sg;
/* don't queue twice */
if (hwreq->req.status == -EALREADY)
return -EALREADY;
hwreq->req.status = -EALREADY;
if (hwreq->req.num_sgs && hwreq->req.length &&
ci->has_short_pkt_limit) {
ret = sglist_get_invalid_entry(ci->dev->parent, hwep->dir,
&hwreq->req);
if (ret < hwreq->req.num_sgs) {
ret = sglist_do_bounce(hwreq, ret, hwep->dir == TX,
&bounced_size);
if (ret)
return ret;
}
}
ret = usb_gadget_map_request_by_dev(ci->dev->parent,
&hwreq->req, hwep->dir);
if (ret)
return ret;
if (hwreq->sgt.sgl) {
/* We've mapped a bigger buffer, now recover the actual size */
sg = sg_last(hwreq->req.sg, hwreq->req.num_sgs);
sg_dma_len(sg) = min(sg_dma_len(sg), bounced_size);
}
if (hwreq->req.num_mapped_sgs)
ret = prepare_td_for_sg(hwep, hwreq);
else
ret = prepare_td_for_non_sg(hwep, hwreq);
if (ret)
return ret;
lastnode = list_entry(hwreq->tds.prev,
struct td_node, td);
lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
if (!hwreq->req.no_interrupt)
lastnode->ptr->token |= cpu_to_le32(TD_IOC);
list_for_each_entry_safe(firstnode, lastnode, &hwreq->tds, td)
trace_ci_prepare_td(hwep, hwreq, firstnode);
firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
wmb();
hwreq->req.actual = 0;
if (!list_empty(&hwep->qh.queue)) {
struct ci_hw_req *hwreqprev;
int n = hw_ep_bit(hwep->num, hwep->dir);
int tmp_stat;
struct td_node *prevlastnode;
u32 next = firstnode->dma & TD_ADDR_MASK;
hwreqprev = list_entry(hwep->qh.queue.prev,
struct ci_hw_req, queue);
prevlastnode = list_entry(hwreqprev->tds.prev,
struct td_node, td);
prevlastnode->ptr->next = cpu_to_le32(next);
wmb();
if (ci->rev == CI_REVISION_22) {
if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
reprime_dtd(ci, hwep, prevlastnode);
}
if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
goto done;
do {
hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
} while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW) && tmp_stat);
hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
if (tmp_stat)
goto done;
/* OP_ENDPTSTAT will be clear by HW when the endpoint met
* err. This dTD don't push to dQH if current dTD point is
* not the last one in previous request.
*/
if (hwep->qh.ptr->curr != cpu_to_le32(prevlastnode->dma))
goto done;
}
/* QH configuration */
hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
hwep->qh.ptr->td.token &=
cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
u32 mul = hwreq->req.length / hwep->ep.maxpacket;
if (hwreq->req.length == 0
|| hwreq->req.length % hwep->ep.maxpacket)
mul++;
hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
}
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 = cpu_to_le32(node->dma);
hwep->qh.ptr->td.token &=
cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
return hw_ep_prime(ci, hwep->num, hwep->dir,
hwep->type == USB_ENDPOINT_XFER_CONTROL);
}
/**
* _hardware_dequeue: handles a request at hardware level
* @hwep: endpoint
* @hwreq: request
*
* 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;
bool is_isoc = hwep->type == USB_ENDPOINT_XFER_ISOC;
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);
trace_ci_complete_td(hwep, hwreq, node);
if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
int n = hw_ep_bit(hwep->num, hwep->dir);
if (ci->rev == CI_REVISION_24 ||
ci->rev == CI_REVISION_22 || is_isoc)
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)) {
if (is_isoc) {
hwreq->req.status = 0;
} else {
hwreq->req.status = -EILSEQ;
break;
}
}
if (remaining_length && !is_isoc) {
if (hwep->dir == TX) {
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_by_dev(hwep->ci->dev->parent,
&hwreq->req, hwep->dir);
/* sglist bounced */
if (hwreq->sgt.sgl)
sglist_do_debounce(hwreq, hwep->dir == RX);
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;
/* 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;
}
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);
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;
u32 intr;
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;
/* clear SLI */
hw_write(ci, OP_USBSTS, USBi_SLI, USBi_SLI);
intr = hw_read(ci, OP_USBINTR, ~0);
hw_write(ci, OP_USBINTR, ~0, intr | USBi_SLI);
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 > hwep->ep.mult * hwep->ep.maxpacket) {
dev_err(hwep->ci->dev, "request length too big for isochronous\n");
return -EMSGSIZE;
}
if (ci->has_short_pkt_limit &&
hwreq->req.length > CI_MAX_REQ_SIZE) {
dev_err(hwep->ci->dev, "request length too big (max 16KB)\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 (req->status < 0)
return;
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)
{
struct ci_hw_ep *hwep;
/*
* Unexpected USB controller behavior, caused by bad signal integrity
* or ground reference problems, can lead to isr_setup_status_phase
* being called with ci->status equal to NULL.
* If this situation occurs, you should review your USB hardware design.
*/
if (WARN_ON_ONCE(!ci->status))
return -EPIPE;
hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
ci->status->context = ci;
ci->status->complete = isr_setup_status_complete;
return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
}
/**
* 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) ? TX : RX;
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) ? TX : RX;
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 USB_TEST_J:
case USB_TEST_K:
case USB_TEST_SE0_NAK:
case USB_TEST_PACKET:
case USB_TEST_FORCE_ENABLE:
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);
hwep->ep.mult = usb_endpoint_maxp_mult(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);
if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
spin_unlock_irqrestore(hwep->lock, flags);
return 0;
}
/* 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;
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);
if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
spin_unlock_irqrestore(hwep->lock, flags);
return 0;
}
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);
if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
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);
if (hwreq->sgt.sgl)
sglist_do_debounce(hwreq, false);
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);
if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
spin_unlock_irqrestore(hwep->lock, flags);
return;
}
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_get_frame(struct usb_gadget *_gadget)
{
struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
unsigned long flags;
int ret;
spin_lock_irqsave(&ci->lock, flags);
ret = hw_read(ci, OP_FRINDEX, 0x3fff);
spin_unlock_irqrestore(&ci->lock, flags);
return ret >> 3;
}
/*
* ci_hdrc_gadget_connect: caller makes sure gadget driver is binded
*/
static void ci_hdrc_gadget_connect(struct usb_gadget *_gadget, int is_active)
{
struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
if (is_active) {
pm_runtime_get_sync(ci->dev);
hw_device_reset(ci);
spin_lock_irq(&ci->lock);
if (ci->driver) {
hw_device_state(ci, ci->ep0out->qh.dma);
usb_gadget_set_state(_gadget, USB_STATE_POWERED);
spin_unlock_irq(&ci->lock);
usb_udc_vbus_handler(_gadget, true);
} else {
spin_unlock_irq(&ci->lock);
}
} 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(ci->dev);
usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
}
}
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 ret = 0;
spin_lock_irqsave(&ci->lock, flags);
ci->vbus_active = is_active;
spin_unlock_irqrestore(&ci->lock, flags);
if (ci->usb_phy)
usb_phy_set_charger_state(ci->usb_phy, is_active ?
USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
if (ci->platdata->notify_event)
ret = ci->platdata->notify_event(ci,
CI_HDRC_CONTROLLER_VBUS_EVENT);
if (ci->usb_phy) {
if (is_active)
usb_phy_set_event(ci->usb_phy, USB_EVENT_VBUS);
else
usb_phy_set_event(ci->usb_phy, USB_EVENT_NONE);
}
if (ci->driver)
ci_hdrc_gadget_connect(_gadget, is_active);
return ret;
}
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->gadget.speed == USB_SPEED_UNKNOWN) {
spin_unlock_irqrestore(&ci->lock, flags);
return 0;
}
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/disconnect
*/
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;
* and don't touch Data+ in host mode for dual role config.
*/
if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
return 0;
pm_runtime_get_sync(ci->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->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);
/* Match ISOC IN from the highest endpoint */
static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget,
struct usb_endpoint_descriptor *desc,
struct usb_ss_ep_comp_descriptor *comp_desc)
{
struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
struct usb_ep *ep;
if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) {
list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) {
if (ep->caps.dir_in && !ep->claimed)
return ep;
}
}
return NULL;
}
/*
* 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 = {
.get_frame = ci_udc_get_frame,
.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,
.match_ep = ci_udc_match_ep,
};
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_zalloc(ci->qh_pool, GFP_KERNEL,
&hwep->qh.dma);
if (hwep->qh.ptr == NULL)
retval = -ENOMEM;
/*
* 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);
int retval;
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;
}
if (ci->vbus_active)
ci_hdrc_gadget_connect(gadget, 1);
else
usb_udc_vbus_handler(&ci->gadget, false);
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);
ci->driver = NULL;
if (ci->vbus_active) {
hw_device_state(ci, 0);
spin_unlock_irqrestore(&ci->lock, flags);
if (ci->platdata->notify_event)
ci->platdata->notify_event(ci,
CI_HDRC_CONTROLLER_STOPPED_EVENT);
_gadget_stop_activity(&ci->gadget);
spin_lock_irqsave(&ci->lock, flags);
pm_runtime_put(ci->dev);
}
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->usb_phy)
usb_phy_set_event(ci->usb_phy,
USB_EVENT_ENUMERATED);
if (ci->suspended) {
if (ci->driver->resume) {
spin_unlock(&ci->lock);
ci->driver->resume(&ci->gadget);
spin_lock(&ci->lock);
}
ci->suspended = 0;
usb_gadget_set_state(&ci->gadget,
ci->resume_state);
}
}
if ((USBi_UI | USBi_UEI) & intr)
isr_tr_complete_handler(ci);
if ((USBi_SLI & intr) && !(ci->suspended)) {
ci->suspended = 1;
ci->resume_state = ci->gadget.state;
if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
ci->driver->suspend) {
spin_unlock(&ci->lock);
ci->driver->suspend(&ci->gadget);
spin_lock(&ci->lock);
}
usb_gadget_set_state(&ci->gadget,
USB_STATE_SUSPENDED);
}
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;
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;
ci->gadget.sg_supported = 1;
ci->gadget.irq = ci->irq;
if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
ci->gadget.quirk_avoids_skb_reserve = 1;
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->parent,
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->parent,
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;
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->platdata->pins_device)
pinctrl_select_state(ci->platdata->pctl,
ci->platdata->pins_device);
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 disable BSV irq
*/
if (ci->is_otg)
hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
ci->vbus_active = 0;
if (ci->platdata->pins_device && ci->platdata->pins_default)
pinctrl_select_state(ci->platdata->pctl,
ci->platdata->pins_default);
}
#ifdef CONFIG_PM_SLEEP
static void udc_suspend(struct ci_hdrc *ci)
{
/*
* Set OP_ENDPTLISTADDR to be non-zero for
* checking if controller resume from power lost
* in non-host mode.
*/
if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0)
hw_write(ci, OP_ENDPTLISTADDR, ~0, ~0);
}
static void udc_resume(struct ci_hdrc *ci, bool power_lost)
{
if (power_lost) {
if (ci->is_otg)
hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
OTGSC_BSVIS | OTGSC_BSVIE);
if (ci->vbus_active)
usb_gadget_vbus_disconnect(&ci->gadget);
}
/* Restore value 0 if it was set for power lost check */
if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0xFFFFFFFF)
hw_write(ci, OP_ENDPTLISTADDR, ~0, 0);
}
#endif
/**
* 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;
int ret;
if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
return -ENXIO;
rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
if (!rdrv)
return -ENOMEM;
rdrv->start = udc_id_switch_for_device;
rdrv->stop = udc_id_switch_for_host;
#ifdef CONFIG_PM_SLEEP
rdrv->suspend = udc_suspend;
rdrv->resume = udc_resume;
#endif
rdrv->irq = udc_irq;
rdrv->name = "gadget";
ret = udc_start(ci);
if (!ret)
ci->roles[CI_ROLE_GADGET] = rdrv;
return ret;
}
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