// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2021 Aspeed Technology Inc.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/prefetch.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/slab.h>
#define AST_UDC_NUM_ENDPOINTS (1 + 4)
#define AST_UDC_EP0_MAX_PACKET 64 /* EP0's max packet size */
#define AST_UDC_EPn_MAX_PACKET 1024 /* Generic EPs max packet size */
#define AST_UDC_DESCS_COUNT 256 /* Use 256 stages descriptor mode (32/256) */
#define AST_UDC_DESC_MODE 1 /* Single/Multiple Stage(s) Descriptor Mode */
#define AST_UDC_EP_DMA_SIZE (AST_UDC_EPn_MAX_PACKET + 8 * AST_UDC_DESCS_COUNT)
/*****************************
* *
* UDC register definitions *
* *
*****************************/
#define AST_UDC_FUNC_CTRL 0x00 /* Root Function Control & Status Register */
#define AST_UDC_CONFIG 0x04 /* Root Configuration Setting Register */
#define AST_UDC_IER 0x08 /* Interrupt Control Register */
#define AST_UDC_ISR 0x0C /* Interrupt Status Register */
#define AST_UDC_EP_ACK_IER 0x10 /* Programmable ep Pool ACK Interrupt Enable Reg */
#define AST_UDC_EP_NAK_IER 0x14 /* Programmable ep Pool NAK Interrupt Enable Reg */
#define AST_UDC_EP_ACK_ISR 0x18 /* Programmable ep Pool ACK Interrupt Status Reg */
#define AST_UDC_EP_NAK_ISR 0x1C /* Programmable ep Pool NAK Interrupt Status Reg */
#define AST_UDC_DEV_RESET 0x20 /* Device Controller Soft Reset Enable Register */
#define AST_UDC_STS 0x24 /* USB Status Register */
#define AST_VHUB_EP_DATA 0x28 /* Programmable ep Pool Data Toggle Value Set */
#define AST_VHUB_ISO_TX_FAIL 0x2C /* Isochronous Transaction Fail Accumulator */
#define AST_UDC_EP0_CTRL 0x30 /* Endpoint 0 Control/Status Register */
#define AST_UDC_EP0_DATA_BUFF 0x34 /* Base Address of ep0 IN/OUT Data Buffer Reg */
#define AST_UDC_SETUP0 0x80 /* Root Device Setup Data Buffer0 */
#define AST_UDC_SETUP1 0x84 /* Root Device Setup Data Buffer1 */
/* Main control reg */
#define USB_PHY_CLK_EN BIT(31)
#define USB_FIFO_DYN_PWRD_EN BIT(19)
#define USB_EP_LONG_DESC BIT(18)
#define USB_BIST_TEST_PASS BIT(13)
#define USB_BIST_TURN_ON BIT(12)
#define USB_PHY_RESET_DIS BIT(11)
#define USB_TEST_MODE(x) ((x) << 8)
#define USB_FORCE_TIMER_HS BIT(7)
#define USB_FORCE_HS BIT(6)
#define USB_REMOTE_WAKEUP_12MS BIT(5)
#define USB_REMOTE_WAKEUP_EN BIT(4)
#define USB_AUTO_REMOTE_WAKEUP_EN BIT(3)
#define USB_STOP_CLK_IN_SUPEND BIT(2)
#define USB_UPSTREAM_FS BIT(1)
#define USB_UPSTREAM_EN BIT(0)
/* Main config reg */
#define UDC_CFG_SET_ADDR(x) ((x) & UDC_CFG_ADDR_MASK)
#define UDC_CFG_ADDR_MASK GENMASK(6, 0)
/* Interrupt ctrl & status reg */
#define UDC_IRQ_EP_POOL_NAK BIT(17)
#define UDC_IRQ_EP_POOL_ACK_STALL BIT(16)
#define UDC_IRQ_BUS_RESUME BIT(8)
#define UDC_IRQ_BUS_SUSPEND BIT(7)
#define UDC_IRQ_BUS_RESET BIT(6)
#define UDC_IRQ_EP0_IN_DATA_NAK BIT(4)
#define UDC_IRQ_EP0_IN_ACK_STALL BIT(3)
#define UDC_IRQ_EP0_OUT_NAK BIT(2)
#define UDC_IRQ_EP0_OUT_ACK_STALL BIT(1)
#define UDC_IRQ_EP0_SETUP BIT(0)
#define UDC_IRQ_ACK_ALL (0x1ff)
/* EP isr reg */
#define USB_EP3_ISR BIT(3)
#define USB_EP2_ISR BIT(2)
#define USB_EP1_ISR BIT(1)
#define USB_EP0_ISR BIT(0)
#define UDC_IRQ_EP_ACK_ALL (0xf)
/*Soft reset reg */
#define ROOT_UDC_SOFT_RESET BIT(0)
/* USB status reg */
#define UDC_STS_HIGHSPEED BIT(27)
/* Programmable EP data toggle */
#define EP_TOGGLE_SET_EPNUM(x) ((x) & 0x3)
/* EP0 ctrl reg */
#define EP0_GET_RX_LEN(x) ((x >> 16) & 0x7f)
#define EP0_TX_LEN(x) ((x & 0x7f) << 8)
#define EP0_RX_BUFF_RDY BIT(2)
#define EP0_TX_BUFF_RDY BIT(1)
#define EP0_STALL BIT(0)
/*************************************
* *
* per-endpoint register definitions *
* *
*************************************/
#define AST_UDC_EP_CONFIG 0x00 /* Endpoint Configuration Register */
#define AST_UDC_EP_DMA_CTRL 0x04 /* DMA Descriptor List Control/Status Register */
#define AST_UDC_EP_DMA_BUFF 0x08 /* DMA Descriptor/Buffer Base Address */
#define AST_UDC_EP_DMA_STS 0x0C /* DMA Descriptor List R/W Pointer and Status */
#define AST_UDC_EP_BASE 0x200
#define AST_UDC_EP_OFFSET 0x10
/* EP config reg */
#define EP_SET_MAX_PKT(x) ((x & 0x3ff) << 16)
#define EP_DATA_FETCH_CTRL(x) ((x & 0x3) << 14)
#define EP_AUTO_DATA_DISABLE (0x1 << 13)
#define EP_SET_EP_STALL (0x1 << 12)
#define EP_SET_EP_NUM(x) ((x & 0xf) << 8)
#define EP_SET_TYPE_MASK(x) ((x) << 5)
#define EP_TYPE_BULK (0x1)
#define EP_TYPE_INT (0x2)
#define EP_TYPE_ISO (0x3)
#define EP_DIR_OUT (0x1 << 4)
#define EP_ALLOCATED_MASK (0x7 << 1)
#define EP_ENABLE BIT(0)
/* EP DMA ctrl reg */
#define EP_DMA_CTRL_GET_PROC_STS(x) ((x >> 4) & 0xf)
#define EP_DMA_CTRL_STS_RX_IDLE 0x0
#define EP_DMA_CTRL_STS_TX_IDLE 0x8
#define EP_DMA_CTRL_IN_LONG_MODE (0x1 << 3)
#define EP_DMA_CTRL_RESET (0x1 << 2)
#define EP_DMA_SINGLE_STAGE (0x1 << 1)
#define EP_DMA_DESC_MODE (0x1 << 0)
/* EP DMA status reg */
#define EP_DMA_SET_TX_SIZE(x) ((x & 0x7ff) << 16)
#define EP_DMA_GET_TX_SIZE(x) (((x) >> 16) & 0x7ff)
#define EP_DMA_GET_RPTR(x) (((x) >> 8) & 0xff)
#define EP_DMA_GET_WPTR(x) ((x) & 0xff)
#define EP_DMA_SINGLE_KICK (1 << 0) /* WPTR = 1 for single mode */
/* EP desc reg */
#define AST_EP_DMA_DESC_INTR_ENABLE BIT(31)
#define AST_EP_DMA_DESC_PID_DATA0 (0 << 14)
#define AST_EP_DMA_DESC_PID_DATA2 BIT(14)
#define AST_EP_DMA_DESC_PID_DATA1 (2 << 14)
#define AST_EP_DMA_DESC_PID_MDATA (3 << 14)
#define EP_DESC1_IN_LEN(x) ((x) & 0x1fff)
#define AST_EP_DMA_DESC_MAX_LEN (7680) /* Max packet length for trasmit in 1 desc */
struct ast_udc_request {
struct usb_request req;
struct list_head queue;
unsigned mapped:1;
unsigned int actual_dma_length;
u32 saved_dma_wptr;
};
#define to_ast_req(__req) container_of(__req, struct ast_udc_request, req)
struct ast_dma_desc {
u32 des_0;
u32 des_1;
};
struct ast_udc_ep {
struct usb_ep ep;
/* Request queue */
struct list_head queue;
struct ast_udc_dev *udc;
void __iomem *ep_reg;
void *epn_buf;
dma_addr_t epn_buf_dma;
const struct usb_endpoint_descriptor *desc;
/* DMA Descriptors */
struct ast_dma_desc *descs;
dma_addr_t descs_dma;
u32 descs_wptr;
u32 chunk_max;
bool dir_in:1;
unsigned stopped:1;
bool desc_mode:1;
};
#define to_ast_ep(__ep) container_of(__ep, struct ast_udc_ep, ep)
struct ast_udc_dev {
struct platform_device *pdev;
void __iomem *reg;
int irq;
spinlock_t lock;
struct clk *clk;
struct work_struct wake_work;
/* EP0 DMA buffers allocated in one chunk */
void *ep0_buf;
dma_addr_t ep0_buf_dma;
struct ast_udc_ep ep[AST_UDC_NUM_ENDPOINTS];
struct usb_gadget gadget;
struct usb_gadget_driver *driver;
void __iomem *creq;
enum usb_device_state suspended_from;
int desc_mode;
/* Force full speed only */
bool force_usb1:1;
unsigned is_control_tx:1;
bool wakeup_en:1;
};
#define to_ast_dev(__g) container_of(__g, struct ast_udc_dev, gadget)
static const char * const ast_ep_name[] = {
"ep0", "ep1", "ep2", "ep3", "ep4"
};
#ifdef AST_UDC_DEBUG_ALL
#define AST_UDC_DEBUG
#define AST_SETUP_DEBUG
#define AST_EP_DEBUG
#define AST_ISR_DEBUG
#endif
#ifdef AST_SETUP_DEBUG
#define SETUP_DBG(u, fmt, ...) \
dev_dbg(&(u)->pdev->dev, "%s() " fmt, __func__, ##__VA_ARGS__)
#else
#define SETUP_DBG(u, fmt, ...)
#endif
#ifdef AST_EP_DEBUG
#define EP_DBG(e, fmt, ...) \
dev_dbg(&(e)->udc->pdev->dev, "%s():%s " fmt, __func__, \
(e)->ep.name, ##__VA_ARGS__)
#else
#define EP_DBG(ep, fmt, ...) ((void)(ep))
#endif
#ifdef AST_UDC_DEBUG
#define UDC_DBG(u, fmt, ...) \
dev_dbg(&(u)->pdev->dev, "%s() " fmt, __func__, ##__VA_ARGS__)
#else
#define UDC_DBG(u, fmt, ...)
#endif
#ifdef AST_ISR_DEBUG
#define ISR_DBG(u, fmt, ...) \
dev_dbg(&(u)->pdev->dev, "%s() " fmt, __func__, ##__VA_ARGS__)
#else
#define ISR_DBG(u, fmt, ...)
#endif
/*-------------------------------------------------------------------------*/
#define ast_udc_read(udc, offset) \
readl((udc)->reg + (offset))
#define ast_udc_write(udc, val, offset) \
writel((val), (udc)->reg + (offset))
#define ast_ep_read(ep, reg) \
readl((ep)->ep_reg + (reg))
#define ast_ep_write(ep, val, reg) \
writel((val), (ep)->ep_reg + (reg))
/*-------------------------------------------------------------------------*/
static void ast_udc_done(struct ast_udc_ep *ep, struct ast_udc_request *req,
int status)
{
struct ast_udc_dev *udc = ep->udc;
EP_DBG(ep, "req @%p, len (%d/%d), buf:0x%x, dir:0x%x\n",
req, req->req.actual, req->req.length,
(u32)req->req.buf, ep->dir_in);
list_del(&req->queue);
if (req->req.status == -EINPROGRESS)
req->req.status = status;
else
status = req->req.status;
if (status && status != -ESHUTDOWN)
EP_DBG(ep, "done req:%p, status:%d\n", req, status);
spin_unlock(&udc->lock);
usb_gadget_giveback_request(&ep->ep, &req->req);
spin_lock(&udc->lock);
}
static void ast_udc_nuke(struct ast_udc_ep *ep, int status)
{
int count = 0;
while (!list_empty(&ep->queue)) {
struct ast_udc_request *req;
req = list_entry(ep->queue.next, struct ast_udc_request,
queue);
ast_udc_done(ep, req, status);
count++;
}
if (count)
EP_DBG(ep, "Nuked %d request(s)\n", count);
}
/*
* Stop activity on all endpoints.
* Device controller for which EP activity is to be stopped.
*
* All the endpoints are stopped and any pending transfer requests if any on
* the endpoint are terminated.
*/
static void ast_udc_stop_activity(struct ast_udc_dev *udc)
{
struct ast_udc_ep *ep;
int i;
for (i = 0; i < AST_UDC_NUM_ENDPOINTS; i++) {
ep = &udc->ep[i];
ep->stopped = 1;
ast_udc_nuke(ep, -ESHUTDOWN);
}
}
static int ast_udc_ep_enable(struct usb_ep *_ep,
const struct usb_endpoint_descriptor *desc)
{
u16 maxpacket = usb_endpoint_maxp(desc);
struct ast_udc_ep *ep = to_ast_ep(_ep);
struct ast_udc_dev *udc = ep->udc;
u8 epnum = usb_endpoint_num(desc);
unsigned long flags;
u32 ep_conf = 0;
u8 dir_in;
u8 type;
if (!_ep || !ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT ||
maxpacket == 0 || maxpacket > ep->ep.maxpacket) {
EP_DBG(ep, "Failed, invalid EP enable param\n");
return -EINVAL;
}
if (!udc->driver) {
EP_DBG(ep, "bogus device state\n");
return -ESHUTDOWN;
}
EP_DBG(ep, "maxpacket:0x%x\n", maxpacket);
spin_lock_irqsave(&udc->lock, flags);
ep->desc = desc;
ep->stopped = 0;
ep->ep.maxpacket = maxpacket;
ep->chunk_max = AST_EP_DMA_DESC_MAX_LEN;
if (maxpacket < AST_UDC_EPn_MAX_PACKET)
ep_conf = EP_SET_MAX_PKT(maxpacket);
ep_conf |= EP_SET_EP_NUM(epnum);
type = usb_endpoint_type(desc);
dir_in = usb_endpoint_dir_in(desc);
ep->dir_in = dir_in;
if (!ep->dir_in)
ep_conf |= EP_DIR_OUT;
EP_DBG(ep, "type %d, dir_in %d\n", type, dir_in);
switch (type) {
case USB_ENDPOINT_XFER_ISOC:
ep_conf |= EP_SET_TYPE_MASK(EP_TYPE_ISO);
break;
case USB_ENDPOINT_XFER_BULK:
ep_conf |= EP_SET_TYPE_MASK(EP_TYPE_BULK);
break;
case USB_ENDPOINT_XFER_INT:
ep_conf |= EP_SET_TYPE_MASK(EP_TYPE_INT);
break;
}
ep->desc_mode = udc->desc_mode && ep->descs_dma && ep->dir_in;
if (ep->desc_mode) {
ast_ep_write(ep, EP_DMA_CTRL_RESET, AST_UDC_EP_DMA_CTRL);
ast_ep_write(ep, 0, AST_UDC_EP_DMA_STS);
ast_ep_write(ep, ep->descs_dma, AST_UDC_EP_DMA_BUFF);
/* Enable Long Descriptor Mode */
ast_ep_write(ep, EP_DMA_CTRL_IN_LONG_MODE | EP_DMA_DESC_MODE,
AST_UDC_EP_DMA_CTRL);
ep->descs_wptr = 0;
} else {
ast_ep_write(ep, EP_DMA_CTRL_RESET, AST_UDC_EP_DMA_CTRL);
ast_ep_write(ep, EP_DMA_SINGLE_STAGE, AST_UDC_EP_DMA_CTRL);
ast_ep_write(ep, 0, AST_UDC_EP_DMA_STS);
}
/* Cleanup data toggle just in case */
ast_udc_write(udc, EP_TOGGLE_SET_EPNUM(epnum), AST_VHUB_EP_DATA);
/* Enable EP */
ast_ep_write(ep, ep_conf | EP_ENABLE, AST_UDC_EP_CONFIG);
EP_DBG(ep, "ep_config: 0x%x\n", ast_ep_read(ep, AST_UDC_EP_CONFIG));
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static int ast_udc_ep_disable(struct usb_ep *_ep)
{
struct ast_udc_ep *ep = to_ast_ep(_ep);
struct ast_udc_dev *udc = ep->udc;
unsigned long flags;
spin_lock_irqsave(&udc->lock, flags);
ep->ep.desc = NULL;
ep->stopped = 1;
ast_udc_nuke(ep, -ESHUTDOWN);
ast_ep_write(ep, 0, AST_UDC_EP_CONFIG);
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static struct usb_request *ast_udc_ep_alloc_request(struct usb_ep *_ep,
gfp_t gfp_flags)
{
struct ast_udc_ep *ep = to_ast_ep(_ep);
struct ast_udc_request *req;
req = kzalloc(sizeof(struct ast_udc_request), gfp_flags);
if (!req) {
EP_DBG(ep, "request allocation failed\n");
return NULL;
}
INIT_LIST_HEAD(&req->queue);
return &req->req;
}
static void ast_udc_ep_free_request(struct usb_ep *_ep,
struct usb_request *_req)
{
struct ast_udc_request *req = to_ast_req(_req);
kfree(req);
}
static int ast_dma_descriptor_setup(struct ast_udc_ep *ep, u32 dma_buf,
u16 tx_len, struct ast_udc_request *req)
{
struct ast_udc_dev *udc = ep->udc;
struct device *dev = &udc->pdev->dev;
bool last = false;
int chunk, count;
u32 offset;
if (!ep->descs) {
dev_warn(dev, "%s: Empty DMA descs list failure\n",
ep->ep.name);
return -EINVAL;
}
chunk = tx_len;
offset = count = 0;
EP_DBG(ep, "req @%p, %s:%d, %s:0x%x, %s:0x%x\n", req,
"wptr", ep->descs_wptr, "dma_buf", dma_buf,
"tx_len", tx_len);
/* Create Descriptor Lists */
while (chunk >= 0 && !last && count < AST_UDC_DESCS_COUNT) {
ep->descs[ep->descs_wptr].des_0 = dma_buf + offset;
if (chunk > ep->chunk_max) {
ep->descs[ep->descs_wptr].des_1 = ep->chunk_max;
} else {
ep->descs[ep->descs_wptr].des_1 = chunk;
last = true;
}
chunk -= ep->chunk_max;
EP_DBG(ep, "descs[%d]: 0x%x 0x%x\n",
ep->descs_wptr,
ep->descs[ep->descs_wptr].des_0,
ep->descs[ep->descs_wptr].des_1);
if (count == 0)
req->saved_dma_wptr = ep->descs_wptr;
ep->descs_wptr++;
count++;
if (ep->descs_wptr >= AST_UDC_DESCS_COUNT)
ep->descs_wptr = 0;
offset = ep->chunk_max * count;
}
return 0;
}
static void ast_udc_epn_kick(struct ast_udc_ep *ep, struct ast_udc_request *req)
{
u32 tx_len;
u32 last;
last = req->req.length - req->req.actual;
tx_len = last > ep->ep.maxpacket ? ep->ep.maxpacket : last;
EP_DBG(ep, "kick req @%p, len:%d, dir:%d\n",
req, tx_len, ep->dir_in);
ast_ep_write(ep, req->req.dma + req->req.actual, AST_UDC_EP_DMA_BUFF);
/* Start DMA */
ast_ep_write(ep, EP_DMA_SET_TX_SIZE(tx_len), AST_UDC_EP_DMA_STS);
ast_ep_write(ep, EP_DMA_SET_TX_SIZE(tx_len) | EP_DMA_SINGLE_KICK,
AST_UDC_EP_DMA_STS);
}
static void ast_udc_epn_kick_desc(struct ast_udc_ep *ep,
struct ast_udc_request *req)
{
u32 descs_max_size;
u32 tx_len;
u32 last;
descs_max_size = AST_EP_DMA_DESC_MAX_LEN * AST_UDC_DESCS_COUNT;
last = req->req.length - req->req.actual;
tx_len = last > descs_max_size ? descs_max_size : last;
EP_DBG(ep, "kick req @%p, %s:%d, %s:0x%x, %s:0x%x (%d/%d), %s:0x%x\n",
req, "tx_len", tx_len, "dir_in", ep->dir_in,
"dma", req->req.dma + req->req.actual,
req->req.actual, req->req.length,
"descs_max_size", descs_max_size);
if (!ast_dma_descriptor_setup(ep, req->req.dma + req->req.actual,
tx_len, req))
req->actual_dma_length += tx_len;
/* make sure CPU done everything before triggering DMA */
mb();
ast_ep_write(ep, ep->descs_wptr, AST_UDC_EP_DMA_STS);
EP_DBG(ep, "descs_wptr:%d, dstat:0x%x, dctrl:0x%x\n",
ep->descs_wptr,
ast_ep_read(ep, AST_UDC_EP_DMA_STS),
ast_ep_read(ep, AST_UDC_EP_DMA_CTRL));
}
static void ast_udc_ep0_queue(struct ast_udc_ep *ep,
struct ast_udc_request *req)
{
struct ast_udc_dev *udc = ep->udc;
u32 tx_len;
u32 last;
last = req->req.length - req->req.actual;
tx_len = last > ep->ep.maxpacket ? ep->ep.maxpacket : last;
ast_udc_write(udc, req->req.dma + req->req.actual,
AST_UDC_EP0_DATA_BUFF);
if (ep->dir_in) {
/* IN requests, send data */
SETUP_DBG(udc, "IN: %s:0x%x, %s:0x%x, %s:%d (%d/%d), %s:%d\n",
"buf", (u32)req->req.buf,
"dma", req->req.dma + req->req.actual,
"tx_len", tx_len,
req->req.actual, req->req.length,
"dir_in", ep->dir_in);
req->req.actual += tx_len;
ast_udc_write(udc, EP0_TX_LEN(tx_len), AST_UDC_EP0_CTRL);
ast_udc_write(udc, EP0_TX_LEN(tx_len) | EP0_TX_BUFF_RDY,
AST_UDC_EP0_CTRL);
} else {
/* OUT requests, receive data */
SETUP_DBG(udc, "OUT: %s:%x, %s:%x, %s:(%d/%d), %s:%d\n",
"buf", (u32)req->req.buf,
"dma", req->req.dma + req->req.actual,
"len", req->req.actual, req->req.length,
"dir_in", ep->dir_in);
if (!req->req.length) {
/* 0 len request, send tx as completion */
ast_udc_write(udc, EP0_TX_BUFF_RDY, AST_UDC_EP0_CTRL);
ep->dir_in = 0x1;
} else
ast_udc_write(udc, EP0_RX_BUFF_RDY, AST_UDC_EP0_CTRL);
}
}
static int ast_udc_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
gfp_t gfp_flags)
{
struct ast_udc_request *req = to_ast_req(_req);
struct ast_udc_ep *ep = to_ast_ep(_ep);
struct ast_udc_dev *udc = ep->udc;
struct device *dev = &udc->pdev->dev;
unsigned long flags;
int rc;
if (unlikely(!_req || !_req->complete || !_req->buf || !_ep)) {
dev_warn(dev, "Invalid EP request !\n");
return -EINVAL;
}
if (ep->stopped) {
dev_warn(dev, "%s is already stopped !\n", _ep->name);
return -ESHUTDOWN;
}
spin_lock_irqsave(&udc->lock, flags);
list_add_tail(&req->queue, &ep->queue);
req->req.actual = 0;
req->req.status = -EINPROGRESS;
req->actual_dma_length = 0;
rc = usb_gadget_map_request(&udc->gadget, &req->req, ep->dir_in);
if (rc) {
EP_DBG(ep, "Request mapping failure %d\n", rc);
dev_warn(dev, "Request mapping failure %d\n", rc);
goto end;
}
EP_DBG(ep, "enqueue req @%p\n", req);
EP_DBG(ep, "l=%d, dma:0x%x, zero:%d, is_in:%d\n",
_req->length, _req->dma, _req->zero, ep->dir_in);
/* EP0 request enqueue */
if (ep->ep.desc == NULL) {
if ((req->req.dma % 4) != 0) {
dev_warn(dev, "EP0 req dma alignment error\n");
rc = -ESHUTDOWN;
goto end;
}
ast_udc_ep0_queue(ep, req);
goto end;
}
/* EPn request enqueue */
if (list_is_singular(&ep->queue)) {
if (ep->desc_mode)
ast_udc_epn_kick_desc(ep, req);
else
ast_udc_epn_kick(ep, req);
}
end:
spin_unlock_irqrestore(&udc->lock, flags);
return rc;
}
static int ast_udc_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
struct ast_udc_ep *ep = to_ast_ep(_ep);
struct ast_udc_dev *udc = ep->udc;
struct ast_udc_request *req;
unsigned long flags;
int rc = 0;
spin_lock_irqsave(&udc->lock, flags);
/* make sure it's actually queued on this endpoint */
list_for_each_entry(req, &ep->queue, queue) {
if (&req->req == _req) {
list_del_init(&req->queue);
ast_udc_done(ep, req, -ESHUTDOWN);
_req->status = -ECONNRESET;
break;
}
}
/* dequeue request not found */
if (&req->req != _req)
rc = -EINVAL;
spin_unlock_irqrestore(&udc->lock, flags);
return rc;
}
static int ast_udc_ep_set_halt(struct usb_ep *_ep, int value)
{
struct ast_udc_ep *ep = to_ast_ep(_ep);
struct ast_udc_dev *udc = ep->udc;
unsigned long flags;
int epnum;
u32 ctrl;
EP_DBG(ep, "val:%d\n", value);
spin_lock_irqsave(&udc->lock, flags);
epnum = usb_endpoint_num(ep->desc);
/* EP0 */
if (epnum == 0) {
ctrl = ast_udc_read(udc, AST_UDC_EP0_CTRL);
if (value)
ctrl |= EP0_STALL;
else
ctrl &= ~EP0_STALL;
ast_udc_write(udc, ctrl, AST_UDC_EP0_CTRL);
} else {
/* EPn */
ctrl = ast_udc_read(udc, AST_UDC_EP_CONFIG);
if (value)
ctrl |= EP_SET_EP_STALL;
else
ctrl &= ~EP_SET_EP_STALL;
ast_ep_write(ep, ctrl, AST_UDC_EP_CONFIG);
/* only epn is stopped and waits for clear */
ep->stopped = value ? 1 : 0;
}
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static const struct usb_ep_ops ast_udc_ep_ops = {
.enable = ast_udc_ep_enable,
.disable = ast_udc_ep_disable,
.alloc_request = ast_udc_ep_alloc_request,
.free_request = ast_udc_ep_free_request,
.queue = ast_udc_ep_queue,
.dequeue = ast_udc_ep_dequeue,
.set_halt = ast_udc_ep_set_halt,
/* there's only imprecise fifo status reporting */
};
static void ast_udc_ep0_rx(struct ast_udc_dev *udc)
{
ast_udc_write(udc, udc->ep0_buf_dma, AST_UDC_EP0_DATA_BUFF);
ast_udc_write(udc, EP0_RX_BUFF_RDY, AST_UDC_EP0_CTRL);
}
static void ast_udc_ep0_tx(struct ast_udc_dev *udc)
{
ast_udc_write(udc, udc->ep0_buf_dma, AST_UDC_EP0_DATA_BUFF);
ast_udc_write(udc, EP0_TX_BUFF_RDY, AST_UDC_EP0_CTRL);
}
static void ast_udc_ep0_out(struct ast_udc_dev *udc)
{
struct device *dev = &udc->pdev->dev;
struct ast_udc_ep *ep = &udc->ep[0];
struct ast_udc_request *req;
u16 rx_len;
if (list_empty(&ep->queue))
return;
req = list_entry(ep->queue.next, struct ast_udc_request, queue);
rx_len = EP0_GET_RX_LEN(ast_udc_read(udc, AST_UDC_EP0_CTRL));
req->req.actual += rx_len;
SETUP_DBG(udc, "req %p (%d/%d)\n", req,
req->req.actual, req->req.length);
if ((rx_len < ep->ep.maxpacket) ||
(req->req.actual == req->req.length)) {
ast_udc_ep0_tx(udc);
if (!ep->dir_in)
ast_udc_done(ep, req, 0);
} else {
if (rx_len > req->req.length) {
// Issue Fix
dev_warn(dev, "Something wrong (%d/%d)\n",
req->req.actual, req->req.length);
ast_udc_ep0_tx(udc);
ast_udc_done(ep, req, 0);
return;
}
ep->dir_in = 0;
/* More works */
ast_udc_ep0_queue(ep, req);
}
}
static void ast_udc_ep0_in(struct ast_udc_dev *udc)
{
struct ast_udc_ep *ep = &udc->ep[0];
struct ast_udc_request *req;
if (list_empty(&ep->queue)) {
if (udc->is_control_tx) {
ast_udc_ep0_rx(udc);
udc->is_control_tx = 0;
}
return;
}
req = list_entry(ep->queue.next, struct ast_udc_request, queue);
SETUP_DBG(udc, "req %p (%d/%d)\n", req,
req->req.actual, req->req.length);
if (req->req.length == req->req.actual) {
if (req->req.length)
ast_udc_ep0_rx(udc);
if (ep->dir_in)
ast_udc_done(ep, req, 0);
} else {
/* More works */
ast_udc_ep0_queue(ep, req);
}
}
static void ast_udc_epn_handle(struct ast_udc_dev *udc, u16 ep_num)
{
struct ast_udc_ep *ep = &udc->ep[ep_num];
struct ast_udc_request *req;
u16 len = 0;
if (list_empty(&ep->queue))
return;
req = list_first_entry(&ep->queue, struct ast_udc_request, queue);
len = EP_DMA_GET_TX_SIZE(ast_ep_read(ep, AST_UDC_EP_DMA_STS));
req->req.actual += len;
EP_DBG(ep, "req @%p, length:(%d/%d), %s:0x%x\n", req,
req->req.actual, req->req.length, "len", len);
/* Done this request */
if (req->req.length == req->req.actual) {
ast_udc_done(ep, req, 0);
req = list_first_entry_or_null(&ep->queue,
struct ast_udc_request,
queue);
} else {
/* Check for short packet */
if (len < ep->ep.maxpacket) {
ast_udc_done(ep, req, 0);
req = list_first_entry_or_null(&ep->queue,
struct ast_udc_request,
queue);
}
}
/* More requests */
if (req)
ast_udc_epn_kick(ep, req);
}
static void ast_udc_epn_handle_desc(struct ast_udc_dev *udc, u16 ep_num)
{
struct ast_udc_ep *ep = &udc->ep[ep_num];
struct device *dev = &udc->pdev->dev;
struct ast_udc_request *req;
u32 proc_sts, wr_ptr, rd_ptr;
u32 len_in_desc, ctrl;
u16 total_len = 0;
int i;
if (list_empty(&ep->queue)) {
dev_warn(dev, "%s request queue empty!\n", ep->ep.name);
return;
}
req = list_first_entry(&ep->queue, struct ast_udc_request, queue);
ctrl = ast_ep_read(ep, AST_UDC_EP_DMA_CTRL);
proc_sts = EP_DMA_CTRL_GET_PROC_STS(ctrl);
/* Check processing status is idle */
if (proc_sts != EP_DMA_CTRL_STS_RX_IDLE &&
proc_sts != EP_DMA_CTRL_STS_TX_IDLE) {
dev_warn(dev, "EP DMA CTRL: 0x%x, PS:0x%x\n",
ast_ep_read(ep, AST_UDC_EP_DMA_CTRL),
proc_sts);
return;
}
ctrl = ast_ep_read(ep, AST_UDC_EP_DMA_STS);
rd_ptr = EP_DMA_GET_RPTR(ctrl);
wr_ptr = EP_DMA_GET_WPTR(ctrl);
if (rd_ptr != wr_ptr) {
dev_warn(dev, "desc list is not empty ! %s:%d, %s:%d\n",
"rptr", rd_ptr, "wptr", wr_ptr);
return;
}
EP_DBG(ep, "rd_ptr:%d, wr_ptr:%d\n", rd_ptr, wr_ptr);
i = req->saved_dma_wptr;
do {
len_in_desc = EP_DESC1_IN_LEN(ep->descs[i].des_1);
EP_DBG(ep, "desc[%d] len: %d\n", i, len_in_desc);
total_len += len_in_desc;
i++;
if (i >= AST_UDC_DESCS_COUNT)
i = 0;
} while (i != wr_ptr);
req->req.actual += total_len;
EP_DBG(ep, "req @%p, length:(%d/%d), %s:0x%x\n", req,
req->req.actual, req->req.length, "len", total_len);
/* Done this request */
if (req->req.length == req->req.actual) {
ast_udc_done(ep, req, 0);
req = list_first_entry_or_null(&ep->queue,
struct ast_udc_request,
queue);
} else {
/* Check for short packet */
if (total_len < ep->ep.maxpacket) {
ast_udc_done(ep, req, 0);
req = list_first_entry_or_null(&ep->queue,
struct ast_udc_request,
queue);
}
}
/* More requests & dma descs not setup yet */
if (req && (req->actual_dma_length == req->req.actual)) {
EP_DBG(ep, "More requests\n");
ast_udc_epn_kick_desc(ep, req);
}
}
static void ast_udc_ep0_data_tx(struct ast_udc_dev *udc, u8 *tx_data, u32 len)
{
if (len) {
memcpy(udc->ep0_buf, tx_data, len);
ast_udc_write(udc, udc->ep0_buf_dma, AST_UDC_EP0_DATA_BUFF);
ast_udc_write(udc, EP0_TX_LEN(len), AST_UDC_EP0_CTRL);
ast_udc_write(udc, EP0_TX_LEN(len) | EP0_TX_BUFF_RDY,
AST_UDC_EP0_CTRL);
udc->is_control_tx = 1;
} else
ast_udc_write(udc, EP0_TX_BUFF_RDY, AST_UDC_EP0_CTRL);
}
static void ast_udc_getstatus(struct ast_udc_dev *udc)
{
struct usb_ctrlrequest crq;
struct ast_udc_ep *ep;
u16 status = 0;
u16 epnum = 0;
memcpy_fromio(&crq, udc->creq, sizeof(crq));
switch (crq.bRequestType & USB_RECIP_MASK) {
case USB_RECIP_DEVICE:
/* Get device status */
status = 1 << USB_DEVICE_SELF_POWERED;
break;
case USB_RECIP_INTERFACE:
break;
case USB_RECIP_ENDPOINT:
epnum = crq.wIndex & USB_ENDPOINT_NUMBER_MASK;
if (epnum >= AST_UDC_NUM_ENDPOINTS)
goto stall;
status = udc->ep[epnum].stopped;
break;
default:
goto stall;
}
ep = &udc->ep[epnum];
EP_DBG(ep, "status: 0x%x\n", status);
ast_udc_ep0_data_tx(udc, (u8 *)&status, sizeof(status));
return;
stall:
EP_DBG(ep, "Can't respond request\n");
ast_udc_write(udc, ast_udc_read(udc, AST_UDC_EP0_CTRL) | EP0_STALL,
AST_UDC_EP0_CTRL);
}
static void ast_udc_ep0_handle_setup(struct ast_udc_dev *udc)
{
struct ast_udc_ep *ep = &udc->ep[0];
struct ast_udc_request *req;
struct usb_ctrlrequest crq;
int req_num = 0;
int rc = 0;
u32 reg;
memcpy_fromio(&crq, udc->creq, sizeof(crq));
SETUP_DBG(udc, "SETUP packet: %02x/%02x/%04x/%04x/%04x\n",
crq.bRequestType, crq.bRequest, le16_to_cpu(crq.wValue),
le16_to_cpu(crq.wIndex), le16_to_cpu(crq.wLength));
/*
* Cleanup ep0 request(s) in queue because
* there is a new control setup comes.
*/
list_for_each_entry(req, &udc->ep[0].queue, queue) {
req_num++;
EP_DBG(ep, "there is req %p in ep0 queue !\n", req);
}
if (req_num)
ast_udc_nuke(&udc->ep[0], -ETIMEDOUT);
udc->ep[0].dir_in = crq.bRequestType & USB_DIR_IN;
if ((crq.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
switch (crq.bRequest) {
case USB_REQ_SET_ADDRESS:
if (ast_udc_read(udc, AST_UDC_STS) & UDC_STS_HIGHSPEED)
udc->gadget.speed = USB_SPEED_HIGH;
else
udc->gadget.speed = USB_SPEED_FULL;
SETUP_DBG(udc, "set addr: 0x%x\n", crq.wValue);
reg = ast_udc_read(udc, AST_UDC_CONFIG);
reg &= ~UDC_CFG_ADDR_MASK;
reg |= UDC_CFG_SET_ADDR(crq.wValue);
ast_udc_write(udc, reg, AST_UDC_CONFIG);
goto req_complete;
case USB_REQ_CLEAR_FEATURE:
SETUP_DBG(udc, "ep0: CLEAR FEATURE\n");
goto req_driver;
case USB_REQ_SET_FEATURE:
SETUP_DBG(udc, "ep0: SET FEATURE\n");
goto req_driver;
case USB_REQ_GET_STATUS:
ast_udc_getstatus(udc);
return;
default:
goto req_driver;
}
}
req_driver:
if (udc->driver) {
SETUP_DBG(udc, "Forwarding %s to gadget...\n",
udc->gadget.name);
spin_unlock(&udc->lock);
rc = udc->driver->setup(&udc->gadget, &crq);
spin_lock(&udc->lock);
} else {
SETUP_DBG(udc, "No gadget for request !\n");
}
if (rc >= 0)
return;
/* Stall if gadget failed */
SETUP_DBG(udc, "Stalling, rc:0x%x\n", rc);
ast_udc_write(udc, ast_udc_read(udc, AST_UDC_EP0_CTRL) | EP0_STALL,
AST_UDC_EP0_CTRL);
return;
req_complete:
SETUP_DBG(udc, "ep0: Sending IN status without data\n");
ast_udc_write(udc, EP0_TX_BUFF_RDY, AST_UDC_EP0_CTRL);
}
static irqreturn_t ast_udc_isr(int irq, void *data)
{
struct ast_udc_dev *udc = (struct ast_udc_dev *)data;
struct ast_udc_ep *ep;
u32 isr, ep_isr;
int i;
spin_lock(&udc->lock);
isr = ast_udc_read(udc, AST_UDC_ISR);
if (!isr)
goto done;
/* Ack interrupts */
ast_udc_write(udc, isr, AST_UDC_ISR);
if (isr & UDC_IRQ_BUS_RESET) {
ISR_DBG(udc, "UDC_IRQ_BUS_RESET\n");
udc->gadget.speed = USB_SPEED_UNKNOWN;
ep = &udc->ep[1];
EP_DBG(ep, "dctrl:0x%x\n",
ast_ep_read(ep, AST_UDC_EP_DMA_CTRL));
if (udc->driver && udc->driver->reset) {
spin_unlock(&udc->lock);
udc->driver->reset(&udc->gadget);
spin_lock(&udc->lock);
}
}
if (isr & UDC_IRQ_BUS_SUSPEND) {
ISR_DBG(udc, "UDC_IRQ_BUS_SUSPEND\n");
udc->suspended_from = udc->gadget.state;
usb_gadget_set_state(&udc->gadget, USB_STATE_SUSPENDED);
if (udc->driver && udc->driver->suspend) {
spin_unlock(&udc->lock);
udc->driver->suspend(&udc->gadget);
spin_lock(&udc->lock);
}
}
if (isr & UDC_IRQ_BUS_RESUME) {
ISR_DBG(udc, "UDC_IRQ_BUS_RESUME\n");
usb_gadget_set_state(&udc->gadget, udc->suspended_from);
if (udc->driver && udc->driver->resume) {
spin_unlock(&udc->lock);
udc->driver->resume(&udc->gadget);
spin_lock(&udc->lock);
}
}
if (isr & UDC_IRQ_EP0_IN_ACK_STALL) {
ISR_DBG(udc, "UDC_IRQ_EP0_IN_ACK_STALL\n");
ast_udc_ep0_in(udc);
}
if (isr & UDC_IRQ_EP0_OUT_ACK_STALL) {
ISR_DBG(udc, "UDC_IRQ_EP0_OUT_ACK_STALL\n");
ast_udc_ep0_out(udc);
}
if (isr & UDC_IRQ_EP0_SETUP) {
ISR_DBG(udc, "UDC_IRQ_EP0_SETUP\n");
ast_udc_ep0_handle_setup(udc);
}
if (isr & UDC_IRQ_EP_POOL_ACK_STALL) {
ISR_DBG(udc, "UDC_IRQ_EP_POOL_ACK_STALL\n");
ep_isr = ast_udc_read(udc, AST_UDC_EP_ACK_ISR);
/* Ack EP interrupts */
ast_udc_write(udc, ep_isr, AST_UDC_EP_ACK_ISR);
/* Handle each EP */
for (i = 0; i < AST_UDC_NUM_ENDPOINTS - 1; i++) {
if (ep_isr & (0x1 << i)) {
ep = &udc->ep[i + 1];
if (ep->desc_mode)
ast_udc_epn_handle_desc(udc, i + 1);
else
ast_udc_epn_handle(udc, i + 1);
}
}
}
done:
spin_unlock(&udc->lock);
return IRQ_HANDLED;
}
static int ast_udc_gadget_getframe(struct usb_gadget *gadget)
{
struct ast_udc_dev *udc = to_ast_dev(gadget);
return (ast_udc_read(udc, AST_UDC_STS) >> 16) & 0x7ff;
}
static void ast_udc_wake_work(struct work_struct *work)
{
struct ast_udc_dev *udc = container_of(work, struct ast_udc_dev,
wake_work);
unsigned long flags;
u32 ctrl;
spin_lock_irqsave(&udc->lock, flags);
UDC_DBG(udc, "Wakeup Host !\n");
ctrl = ast_udc_read(udc, AST_UDC_FUNC_CTRL);
ast_udc_write(udc, ctrl | USB_REMOTE_WAKEUP_EN, AST_UDC_FUNC_CTRL);
spin_unlock_irqrestore(&udc->lock, flags);
}
static void ast_udc_wakeup_all(struct ast_udc_dev *udc)
{
/*
* A device is trying to wake the world, because this
* can recurse into the device, we break the call chain
* using a work queue
*/
schedule_work(&udc->wake_work);
}
static int ast_udc_wakeup(struct usb_gadget *gadget)
{
struct ast_udc_dev *udc = to_ast_dev(gadget);
unsigned long flags;
int rc = 0;
spin_lock_irqsave(&udc->lock, flags);
if (!udc->wakeup_en) {
UDC_DBG(udc, "Remote Wakeup is disabled\n");
rc = -EINVAL;
goto err;
}
UDC_DBG(udc, "Device initiated wakeup\n");
ast_udc_wakeup_all(udc);
err:
spin_unlock_irqrestore(&udc->lock, flags);
return rc;
}
/*
* Activate/Deactivate link with host
*/
static int ast_udc_pullup(struct usb_gadget *gadget, int is_on)
{
struct ast_udc_dev *udc = to_ast_dev(gadget);
unsigned long flags;
u32 ctrl;
spin_lock_irqsave(&udc->lock, flags);
UDC_DBG(udc, "is_on: %d\n", is_on);
if (is_on)
ctrl = ast_udc_read(udc, AST_UDC_FUNC_CTRL) | USB_UPSTREAM_EN;
else
ctrl = ast_udc_read(udc, AST_UDC_FUNC_CTRL) & ~USB_UPSTREAM_EN;
ast_udc_write(udc, ctrl, AST_UDC_FUNC_CTRL);
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static int ast_udc_start(struct usb_gadget *gadget,
struct usb_gadget_driver *driver)
{
struct ast_udc_dev *udc = to_ast_dev(gadget);
struct ast_udc_ep *ep;
unsigned long flags;
int i;
spin_lock_irqsave(&udc->lock, flags);
UDC_DBG(udc, "\n");
udc->driver = driver;
udc->gadget.dev.of_node = udc->pdev->dev.of_node;
for (i = 0; i < AST_UDC_NUM_ENDPOINTS; i++) {
ep = &udc->ep[i];
ep->stopped = 0;
}
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static int ast_udc_stop(struct usb_gadget *gadget)
{
struct ast_udc_dev *udc = to_ast_dev(gadget);
unsigned long flags;
u32 ctrl;
spin_lock_irqsave(&udc->lock, flags);
UDC_DBG(udc, "\n");
ctrl = ast_udc_read(udc, AST_UDC_FUNC_CTRL) & ~USB_UPSTREAM_EN;
ast_udc_write(udc, ctrl, AST_UDC_FUNC_CTRL);
udc->gadget.speed = USB_SPEED_UNKNOWN;
udc->driver = NULL;
ast_udc_stop_activity(udc);
usb_gadget_set_state(&udc->gadget, USB_STATE_NOTATTACHED);
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static const struct usb_gadget_ops ast_udc_ops = {
.get_frame = ast_udc_gadget_getframe,
.wakeup = ast_udc_wakeup,
.pullup = ast_udc_pullup,
.udc_start = ast_udc_start,
.udc_stop = ast_udc_stop,
};
/*
* Support 1 Control Endpoint.
* Support multiple programmable endpoints that can be configured to
* Bulk IN/OUT, Interrupt IN/OUT, and Isochronous IN/OUT type endpoint.
*/
static void ast_udc_init_ep(struct ast_udc_dev *udc)
{
struct ast_udc_ep *ep;
int i;
for (i = 0; i < AST_UDC_NUM_ENDPOINTS; i++) {
ep = &udc->ep[i];
ep->ep.name = ast_ep_name[i];
if (i == 0) {
ep->ep.caps.type_control = true;
} else {
ep->ep.caps.type_iso = true;
ep->ep.caps.type_bulk = true;
ep->ep.caps.type_int = true;
}
ep->ep.caps.dir_in = true;
ep->ep.caps.dir_out = true;
ep->ep.ops = &ast_udc_ep_ops;
ep->udc = udc;
INIT_LIST_HEAD(&ep->queue);
if (i == 0) {
usb_ep_set_maxpacket_limit(&ep->ep,
AST_UDC_EP0_MAX_PACKET);
continue;
}
ep->ep_reg = udc->reg + AST_UDC_EP_BASE +
(AST_UDC_EP_OFFSET * (i - 1));
ep->epn_buf = udc->ep0_buf + (i * AST_UDC_EP_DMA_SIZE);
ep->epn_buf_dma = udc->ep0_buf_dma + (i * AST_UDC_EP_DMA_SIZE);
usb_ep_set_maxpacket_limit(&ep->ep, AST_UDC_EPn_MAX_PACKET);
ep->descs = ep->epn_buf + AST_UDC_EPn_MAX_PACKET;
ep->descs_dma = ep->epn_buf_dma + AST_UDC_EPn_MAX_PACKET;
ep->descs_wptr = 0;
list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
}
}
static void ast_udc_init_dev(struct ast_udc_dev *udc)
{
INIT_WORK(&udc->wake_work, ast_udc_wake_work);
}
static void ast_udc_init_hw(struct ast_udc_dev *udc)
{
u32 ctrl;
/* Enable PHY */
ctrl = USB_PHY_CLK_EN | USB_PHY_RESET_DIS;
ast_udc_write(udc, ctrl, AST_UDC_FUNC_CTRL);
udelay(1);
ast_udc_write(udc, 0, AST_UDC_DEV_RESET);
/* Set descriptor ring size */
if (AST_UDC_DESCS_COUNT == 256) {
ctrl |= USB_EP_LONG_DESC;
ast_udc_write(udc, ctrl, AST_UDC_FUNC_CTRL);
}
/* Mask & ack all interrupts before installing the handler */
ast_udc_write(udc, 0, AST_UDC_IER);
ast_udc_write(udc, UDC_IRQ_ACK_ALL, AST_UDC_ISR);
/* Enable some interrupts */
ctrl = UDC_IRQ_EP_POOL_ACK_STALL | UDC_IRQ_BUS_RESUME |
UDC_IRQ_BUS_SUSPEND | UDC_IRQ_BUS_RESET |
UDC_IRQ_EP0_IN_ACK_STALL | UDC_IRQ_EP0_OUT_ACK_STALL |
UDC_IRQ_EP0_SETUP;
ast_udc_write(udc, ctrl, AST_UDC_IER);
/* Cleanup and enable ep ACK interrupts */
ast_udc_write(udc, UDC_IRQ_EP_ACK_ALL, AST_UDC_EP_ACK_IER);
ast_udc_write(udc, UDC_IRQ_EP_ACK_ALL, AST_UDC_EP_ACK_ISR);
ast_udc_write(udc, 0, AST_UDC_EP0_CTRL);
}
static void ast_udc_remove(struct platform_device *pdev)
{
struct ast_udc_dev *udc = platform_get_drvdata(pdev);
unsigned long flags;
u32 ctrl;
usb_del_gadget_udc(&udc->gadget);
if (udc->driver) {
/*
* This is broken as only some cleanup is skipped, *udev is
* freed and the register mapping goes away. Any further usage
* probably crashes. Also the device is unbound, so the skipped
* cleanup is never catched up later.
*/
dev_alert(&pdev->dev,
"Driver is busy and still going away. Fasten your seat belts!\n");
return;
}
spin_lock_irqsave(&udc->lock, flags);
/* Disable upstream port connection */
ctrl = ast_udc_read(udc, AST_UDC_FUNC_CTRL) & ~USB_UPSTREAM_EN;
ast_udc_write(udc, ctrl, AST_UDC_FUNC_CTRL);
clk_disable_unprepare(udc->clk);
spin_unlock_irqrestore(&udc->lock, flags);
if (udc->ep0_buf)
dma_free_coherent(&pdev->dev,
AST_UDC_EP_DMA_SIZE * AST_UDC_NUM_ENDPOINTS,
udc->ep0_buf,
udc->ep0_buf_dma);
udc->ep0_buf = NULL;
}
static int ast_udc_probe(struct platform_device *pdev)
{
enum usb_device_speed max_speed;
struct device *dev = &pdev->dev;
struct ast_udc_dev *udc;
int rc;
udc = devm_kzalloc(&pdev->dev, sizeof(struct ast_udc_dev), GFP_KERNEL);
if (!udc)
return -ENOMEM;
udc->gadget.dev.parent = dev;
udc->pdev = pdev;
spin_lock_init(&udc->lock);
udc->gadget.ops = &ast_udc_ops;
udc->gadget.ep0 = &udc->ep[0].ep;
udc->gadget.name = "aspeed-udc";
udc->gadget.dev.init_name = "gadget";
udc->reg = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(udc->reg)) {
dev_err(&pdev->dev, "Failed to map resources\n");
return PTR_ERR(udc->reg);
}
platform_set_drvdata(pdev, udc);
udc->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(udc->clk)) {
rc = PTR_ERR(udc->clk);
goto err;
}
rc = clk_prepare_enable(udc->clk);
if (rc) {
dev_err(&pdev->dev, "Failed to enable clock (0x%x)\n", rc);
goto err;
}
/* Check if we need to limit the HW to USB1 */
max_speed = usb_get_maximum_speed(&pdev->dev);
if (max_speed != USB_SPEED_UNKNOWN && max_speed < USB_SPEED_HIGH)
udc->force_usb1 = true;
/*
* Allocate DMA buffers for all EPs in one chunk
*/
udc->ep0_buf = dma_alloc_coherent(&pdev->dev,
AST_UDC_EP_DMA_SIZE *
AST_UDC_NUM_ENDPOINTS,
&udc->ep0_buf_dma, GFP_KERNEL);
udc->gadget.speed = USB_SPEED_UNKNOWN;
udc->gadget.max_speed = USB_SPEED_HIGH;
udc->creq = udc->reg + AST_UDC_SETUP0;
/*
* Support single stage mode or 32/256 stages descriptor mode.
* Set default as Descriptor Mode.
*/
udc->desc_mode = AST_UDC_DESC_MODE;
dev_info(&pdev->dev, "DMA %s\n", udc->desc_mode ?
"descriptor mode" : "single mode");
INIT_LIST_HEAD(&udc->gadget.ep_list);
INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
/* Initialized udc ep */
ast_udc_init_ep(udc);
/* Initialized udc device */
ast_udc_init_dev(udc);
/* Initialized udc hardware */
ast_udc_init_hw(udc);
/* Find interrupt and install handler */
udc->irq = platform_get_irq(pdev, 0);
if (udc->irq < 0) {
rc = udc->irq;
goto err;
}
rc = devm_request_irq(&pdev->dev, udc->irq, ast_udc_isr, 0,
KBUILD_MODNAME, udc);
if (rc) {
dev_err(&pdev->dev, "Failed to request interrupt\n");
goto err;
}
rc = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
if (rc) {
dev_err(&pdev->dev, "Failed to add gadget udc\n");
goto err;
}
dev_info(&pdev->dev, "Initialized udc in USB%s mode\n",
udc->force_usb1 ? "1" : "2");
return 0;
err:
dev_err(&pdev->dev, "Failed to udc probe, rc:0x%x\n", rc);
ast_udc_remove(pdev);
return rc;
}
static const struct of_device_id ast_udc_of_dt_ids[] = {
{ .compatible = "aspeed,ast2600-udc", },
{}
};
MODULE_DEVICE_TABLE(of, ast_udc_of_dt_ids);
static struct platform_driver ast_udc_driver = {
.probe = ast_udc_probe,
.remove_new = ast_udc_remove,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = ast_udc_of_dt_ids,
},
};
module_platform_driver(ast_udc_driver);
MODULE_DESCRIPTION("ASPEED UDC driver");
MODULE_AUTHOR("Neal Liu <[email protected]>");
MODULE_LICENSE("GPL");
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