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linuxdebug/drivers/usb/gadget/udc/s3c2410_udc.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* linux/drivers/usb/gadget/s3c2410_udc.c
*
* Samsung S3C24xx series on-chip full speed USB device controllers
*
* Copyright (C) 2004-2007 Herbert Pötzl - Arnaud Patard
* Additional cleanups by Ben Dooks <ben-linux@fluff.org>
*/
#define pr_fmt(fmt) "s3c2410_udc: " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
#include <linux/prefetch.h>
#include <linux/io.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/usb.h>
#include <linux/usb/gadget.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/unaligned.h>
#include <linux/platform_data/usb-s3c2410_udc.h>
#include "s3c2410_udc.h"
#include "s3c2410_udc_regs.h"
#define DRIVER_DESC "S3C2410 USB Device Controller Gadget"
#define DRIVER_AUTHOR "Herbert Pötzl <herbert@13thfloor.at>, " \
"Arnaud Patard <arnaud.patard@rtp-net.org>"
static const char gadget_name[] = "s3c2410_udc";
static const char driver_desc[] = DRIVER_DESC;
static struct s3c2410_udc *the_controller;
static struct clk *udc_clock;
static struct clk *usb_bus_clock;
static void __iomem *base_addr;
static int irq_usbd;
static struct dentry *s3c2410_udc_debugfs_root;
static inline u32 udc_read(u32 reg)
{
return readb(base_addr + reg);
}
static inline void udc_write(u32 value, u32 reg)
{
writeb(value, base_addr + reg);
}
static inline void udc_writeb(void __iomem *base, u32 value, u32 reg)
{
writeb(value, base + reg);
}
static struct s3c2410_udc_mach_info *udc_info;
/*************************** DEBUG FUNCTION ***************************/
#define DEBUG_NORMAL 1
#define DEBUG_VERBOSE 2
#ifdef CONFIG_USB_S3C2410_DEBUG
#define USB_S3C2410_DEBUG_LEVEL 0
static uint32_t s3c2410_ticks = 0;
__printf(2, 3)
static void dprintk(int level, const char *fmt, ...)
{
static long prevticks;
static int invocation;
struct va_format vaf;
va_list args;
if (level > USB_S3C2410_DEBUG_LEVEL)
return;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
if (s3c2410_ticks != prevticks) {
prevticks = s3c2410_ticks;
invocation = 0;
}
pr_debug("%1lu.%02d USB: %pV", prevticks, invocation++, &vaf);
va_end(args);
}
#else
__printf(2, 3)
static void dprintk(int level, const char *fmt, ...)
{
}
#endif
static int s3c2410_udc_debugfs_show(struct seq_file *m, void *p)
{
u32 addr_reg, pwr_reg, ep_int_reg, usb_int_reg;
u32 ep_int_en_reg, usb_int_en_reg, ep0_csr;
u32 ep1_i_csr1, ep1_i_csr2, ep1_o_csr1, ep1_o_csr2;
u32 ep2_i_csr1, ep2_i_csr2, ep2_o_csr1, ep2_o_csr2;
addr_reg = udc_read(S3C2410_UDC_FUNC_ADDR_REG);
pwr_reg = udc_read(S3C2410_UDC_PWR_REG);
ep_int_reg = udc_read(S3C2410_UDC_EP_INT_REG);
usb_int_reg = udc_read(S3C2410_UDC_USB_INT_REG);
ep_int_en_reg = udc_read(S3C2410_UDC_EP_INT_EN_REG);
usb_int_en_reg = udc_read(S3C2410_UDC_USB_INT_EN_REG);
udc_write(0, S3C2410_UDC_INDEX_REG);
ep0_csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
udc_write(1, S3C2410_UDC_INDEX_REG);
ep1_i_csr1 = udc_read(S3C2410_UDC_IN_CSR1_REG);
ep1_i_csr2 = udc_read(S3C2410_UDC_IN_CSR2_REG);
ep1_o_csr1 = udc_read(S3C2410_UDC_IN_CSR1_REG);
ep1_o_csr2 = udc_read(S3C2410_UDC_IN_CSR2_REG);
udc_write(2, S3C2410_UDC_INDEX_REG);
ep2_i_csr1 = udc_read(S3C2410_UDC_IN_CSR1_REG);
ep2_i_csr2 = udc_read(S3C2410_UDC_IN_CSR2_REG);
ep2_o_csr1 = udc_read(S3C2410_UDC_IN_CSR1_REG);
ep2_o_csr2 = udc_read(S3C2410_UDC_IN_CSR2_REG);
seq_printf(m, "FUNC_ADDR_REG : 0x%04X\n"
"PWR_REG : 0x%04X\n"
"EP_INT_REG : 0x%04X\n"
"USB_INT_REG : 0x%04X\n"
"EP_INT_EN_REG : 0x%04X\n"
"USB_INT_EN_REG : 0x%04X\n"
"EP0_CSR : 0x%04X\n"
"EP1_I_CSR1 : 0x%04X\n"
"EP1_I_CSR2 : 0x%04X\n"
"EP1_O_CSR1 : 0x%04X\n"
"EP1_O_CSR2 : 0x%04X\n"
"EP2_I_CSR1 : 0x%04X\n"
"EP2_I_CSR2 : 0x%04X\n"
"EP2_O_CSR1 : 0x%04X\n"
"EP2_O_CSR2 : 0x%04X\n",
addr_reg, pwr_reg, ep_int_reg, usb_int_reg,
ep_int_en_reg, usb_int_en_reg, ep0_csr,
ep1_i_csr1, ep1_i_csr2, ep1_o_csr1, ep1_o_csr2,
ep2_i_csr1, ep2_i_csr2, ep2_o_csr1, ep2_o_csr2
);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(s3c2410_udc_debugfs);
/* io macros */
static inline void s3c2410_udc_clear_ep0_opr(void __iomem *base)
{
udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
udc_writeb(base, S3C2410_UDC_EP0_CSR_SOPKTRDY,
S3C2410_UDC_EP0_CSR_REG);
}
static inline void s3c2410_udc_clear_ep0_sst(void __iomem *base)
{
udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
writeb(0x00, base + S3C2410_UDC_EP0_CSR_REG);
}
static inline void s3c2410_udc_clear_ep0_se(void __iomem *base)
{
udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
udc_writeb(base, S3C2410_UDC_EP0_CSR_SSE, S3C2410_UDC_EP0_CSR_REG);
}
static inline void s3c2410_udc_set_ep0_ipr(void __iomem *base)
{
udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
udc_writeb(base, S3C2410_UDC_EP0_CSR_IPKRDY, S3C2410_UDC_EP0_CSR_REG);
}
static inline void s3c2410_udc_set_ep0_de(void __iomem *base)
{
udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
udc_writeb(base, S3C2410_UDC_EP0_CSR_DE, S3C2410_UDC_EP0_CSR_REG);
}
static inline void s3c2410_udc_set_ep0_ss(void __iomem *b)
{
udc_writeb(b, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
udc_writeb(b, S3C2410_UDC_EP0_CSR_SENDSTL, S3C2410_UDC_EP0_CSR_REG);
}
static inline void s3c2410_udc_set_ep0_de_out(void __iomem *base)
{
udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
udc_writeb(base, (S3C2410_UDC_EP0_CSR_SOPKTRDY
| S3C2410_UDC_EP0_CSR_DE),
S3C2410_UDC_EP0_CSR_REG);
}
static inline void s3c2410_udc_set_ep0_de_in(void __iomem *base)
{
udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
udc_writeb(base, (S3C2410_UDC_EP0_CSR_IPKRDY
| S3C2410_UDC_EP0_CSR_DE),
S3C2410_UDC_EP0_CSR_REG);
}
/*------------------------- I/O ----------------------------------*/
/*
* s3c2410_udc_done
*/
static void s3c2410_udc_done(struct s3c2410_ep *ep,
struct s3c2410_request *req, int status)
{
unsigned halted = ep->halted;
list_del_init(&req->queue);
if (likely(req->req.status == -EINPROGRESS))
req->req.status = status;
else
status = req->req.status;
ep->halted = 1;
usb_gadget_giveback_request(&ep->ep, &req->req);
ep->halted = halted;
}
static void s3c2410_udc_nuke(struct s3c2410_udc *udc,
struct s3c2410_ep *ep, int status)
{
while (!list_empty(&ep->queue)) {
struct s3c2410_request *req;
req = list_entry(ep->queue.next, struct s3c2410_request,
queue);
s3c2410_udc_done(ep, req, status);
}
}
static inline int s3c2410_udc_fifo_count_out(void)
{
int tmp;
tmp = udc_read(S3C2410_UDC_OUT_FIFO_CNT2_REG) << 8;
tmp |= udc_read(S3C2410_UDC_OUT_FIFO_CNT1_REG);
return tmp;
}
/*
* s3c2410_udc_write_packet
*/
static inline int s3c2410_udc_write_packet(int fifo,
struct s3c2410_request *req,
unsigned max)
{
unsigned len = min(req->req.length - req->req.actual, max);
u8 *buf = req->req.buf + req->req.actual;
prefetch(buf);
dprintk(DEBUG_VERBOSE, "%s %d %d %d %d\n", __func__,
req->req.actual, req->req.length, len, req->req.actual + len);
req->req.actual += len;
udelay(5);
writesb(base_addr + fifo, buf, len);
return len;
}
/*
* s3c2410_udc_write_fifo
*
* return: 0 = still running, 1 = completed, negative = errno
*/
static int s3c2410_udc_write_fifo(struct s3c2410_ep *ep,
struct s3c2410_request *req)
{
unsigned count;
int is_last;
u32 idx;
int fifo_reg;
u32 ep_csr;
idx = ep->bEndpointAddress & 0x7F;
switch (idx) {
default:
idx = 0;
fallthrough;
case 0:
fifo_reg = S3C2410_UDC_EP0_FIFO_REG;
break;
case 1:
fifo_reg = S3C2410_UDC_EP1_FIFO_REG;
break;
case 2:
fifo_reg = S3C2410_UDC_EP2_FIFO_REG;
break;
case 3:
fifo_reg = S3C2410_UDC_EP3_FIFO_REG;
break;
case 4:
fifo_reg = S3C2410_UDC_EP4_FIFO_REG;
break;
}
count = s3c2410_udc_write_packet(fifo_reg, req, ep->ep.maxpacket);
/* last packet is often short (sometimes a zlp) */
if (count != ep->ep.maxpacket)
is_last = 1;
else if (req->req.length != req->req.actual || req->req.zero)
is_last = 0;
else
is_last = 2;
/* Only ep0 debug messages are interesting */
if (idx == 0)
dprintk(DEBUG_NORMAL,
"Written ep%d %d.%d of %d b [last %d,z %d]\n",
idx, count, req->req.actual, req->req.length,
is_last, req->req.zero);
if (is_last) {
/* The order is important. It prevents sending 2 packets
* at the same time */
if (idx == 0) {
/* Reset signal => no need to say 'data sent' */
if (!(udc_read(S3C2410_UDC_USB_INT_REG)
& S3C2410_UDC_USBINT_RESET))
s3c2410_udc_set_ep0_de_in(base_addr);
ep->dev->ep0state = EP0_IDLE;
} else {
udc_write(idx, S3C2410_UDC_INDEX_REG);
ep_csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
udc_write(idx, S3C2410_UDC_INDEX_REG);
udc_write(ep_csr | S3C2410_UDC_ICSR1_PKTRDY,
S3C2410_UDC_IN_CSR1_REG);
}
s3c2410_udc_done(ep, req, 0);
is_last = 1;
} else {
if (idx == 0) {
/* Reset signal => no need to say 'data sent' */
if (!(udc_read(S3C2410_UDC_USB_INT_REG)
& S3C2410_UDC_USBINT_RESET))
s3c2410_udc_set_ep0_ipr(base_addr);
} else {
udc_write(idx, S3C2410_UDC_INDEX_REG);
ep_csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
udc_write(idx, S3C2410_UDC_INDEX_REG);
udc_write(ep_csr | S3C2410_UDC_ICSR1_PKTRDY,
S3C2410_UDC_IN_CSR1_REG);
}
}
return is_last;
}
static inline int s3c2410_udc_read_packet(int fifo, u8 *buf,
struct s3c2410_request *req, unsigned avail)
{
unsigned len;
len = min(req->req.length - req->req.actual, avail);
req->req.actual += len;
readsb(fifo + base_addr, buf, len);
return len;
}
/*
* return: 0 = still running, 1 = queue empty, negative = errno
*/
static int s3c2410_udc_read_fifo(struct s3c2410_ep *ep,
struct s3c2410_request *req)
{
u8 *buf;
u32 ep_csr;
unsigned bufferspace;
int is_last = 1;
unsigned avail;
int fifo_count = 0;
u32 idx;
int fifo_reg;
idx = ep->bEndpointAddress & 0x7F;
switch (idx) {
default:
idx = 0;
fallthrough;
case 0:
fifo_reg = S3C2410_UDC_EP0_FIFO_REG;
break;
case 1:
fifo_reg = S3C2410_UDC_EP1_FIFO_REG;
break;
case 2:
fifo_reg = S3C2410_UDC_EP2_FIFO_REG;
break;
case 3:
fifo_reg = S3C2410_UDC_EP3_FIFO_REG;
break;
case 4:
fifo_reg = S3C2410_UDC_EP4_FIFO_REG;
break;
}
if (!req->req.length)
return 1;
buf = req->req.buf + req->req.actual;
bufferspace = req->req.length - req->req.actual;
if (!bufferspace) {
dprintk(DEBUG_NORMAL, "%s: buffer full!\n", __func__);
return -1;
}
udc_write(idx, S3C2410_UDC_INDEX_REG);
fifo_count = s3c2410_udc_fifo_count_out();
dprintk(DEBUG_NORMAL, "%s fifo count : %d\n", __func__, fifo_count);
if (fifo_count > ep->ep.maxpacket)
avail = ep->ep.maxpacket;
else
avail = fifo_count;
fifo_count = s3c2410_udc_read_packet(fifo_reg, buf, req, avail);
/* checking this with ep0 is not accurate as we already
* read a control request
**/
if (idx != 0 && fifo_count < ep->ep.maxpacket) {
is_last = 1;
/* overflowed this request? flush extra data */
if (fifo_count != avail)
req->req.status = -EOVERFLOW;
} else {
is_last = (req->req.length <= req->req.actual) ? 1 : 0;
}
udc_write(idx, S3C2410_UDC_INDEX_REG);
fifo_count = s3c2410_udc_fifo_count_out();
/* Only ep0 debug messages are interesting */
if (idx == 0)
dprintk(DEBUG_VERBOSE, "%s fifo count : %d [last %d]\n",
__func__, fifo_count, is_last);
if (is_last) {
if (idx == 0) {
s3c2410_udc_set_ep0_de_out(base_addr);
ep->dev->ep0state = EP0_IDLE;
} else {
udc_write(idx, S3C2410_UDC_INDEX_REG);
ep_csr = udc_read(S3C2410_UDC_OUT_CSR1_REG);
udc_write(idx, S3C2410_UDC_INDEX_REG);
udc_write(ep_csr & ~S3C2410_UDC_OCSR1_PKTRDY,
S3C2410_UDC_OUT_CSR1_REG);
}
s3c2410_udc_done(ep, req, 0);
} else {
if (idx == 0) {
s3c2410_udc_clear_ep0_opr(base_addr);
} else {
udc_write(idx, S3C2410_UDC_INDEX_REG);
ep_csr = udc_read(S3C2410_UDC_OUT_CSR1_REG);
udc_write(idx, S3C2410_UDC_INDEX_REG);
udc_write(ep_csr & ~S3C2410_UDC_OCSR1_PKTRDY,
S3C2410_UDC_OUT_CSR1_REG);
}
}
return is_last;
}
static int s3c2410_udc_read_fifo_crq(struct usb_ctrlrequest *crq)
{
unsigned char *outbuf = (unsigned char *)crq;
int bytes_read = 0;
udc_write(0, S3C2410_UDC_INDEX_REG);
bytes_read = s3c2410_udc_fifo_count_out();
dprintk(DEBUG_NORMAL, "%s: fifo_count=%d\n", __func__, bytes_read);
if (bytes_read > sizeof(struct usb_ctrlrequest))
bytes_read = sizeof(struct usb_ctrlrequest);
readsb(S3C2410_UDC_EP0_FIFO_REG + base_addr, outbuf, bytes_read);
dprintk(DEBUG_VERBOSE, "%s: len=%d %02x:%02x {%x,%x,%x}\n", __func__,
bytes_read, crq->bRequest, crq->bRequestType,
crq->wValue, crq->wIndex, crq->wLength);
return bytes_read;
}
static int s3c2410_udc_get_status(struct s3c2410_udc *dev,
struct usb_ctrlrequest *crq)
{
u16 status = 0;
u8 ep_num = crq->wIndex & 0x7F;
u8 is_in = crq->wIndex & USB_DIR_IN;
switch (crq->bRequestType & USB_RECIP_MASK) {
case USB_RECIP_INTERFACE:
break;
case USB_RECIP_DEVICE:
status = dev->devstatus;
break;
case USB_RECIP_ENDPOINT:
if (ep_num > 4 || crq->wLength > 2)
return 1;
if (ep_num == 0) {
udc_write(0, S3C2410_UDC_INDEX_REG);
status = udc_read(S3C2410_UDC_IN_CSR1_REG);
status = status & S3C2410_UDC_EP0_CSR_SENDSTL;
} else {
udc_write(ep_num, S3C2410_UDC_INDEX_REG);
if (is_in) {
status = udc_read(S3C2410_UDC_IN_CSR1_REG);
status = status & S3C2410_UDC_ICSR1_SENDSTL;
} else {
status = udc_read(S3C2410_UDC_OUT_CSR1_REG);
status = status & S3C2410_UDC_OCSR1_SENDSTL;
}
}
status = status ? 1 : 0;
break;
default:
return 1;
}
/* Seems to be needed to get it working. ouch :( */
udelay(5);
udc_write(status & 0xFF, S3C2410_UDC_EP0_FIFO_REG);
udc_write(status >> 8, S3C2410_UDC_EP0_FIFO_REG);
s3c2410_udc_set_ep0_de_in(base_addr);
return 0;
}
/*------------------------- usb state machine -------------------------------*/
static int s3c2410_udc_set_halt(struct usb_ep *_ep, int value);
static void s3c2410_udc_handle_ep0_idle(struct s3c2410_udc *dev,
struct s3c2410_ep *ep,
struct usb_ctrlrequest *crq,
u32 ep0csr)
{
int len, ret, tmp;
/* start control request? */
if (!(ep0csr & S3C2410_UDC_EP0_CSR_OPKRDY))
return;
s3c2410_udc_nuke(dev, ep, -EPROTO);
len = s3c2410_udc_read_fifo_crq(crq);
if (len != sizeof(*crq)) {
dprintk(DEBUG_NORMAL, "setup begin: fifo READ ERROR"
" wanted %d bytes got %d. Stalling out...\n",
sizeof(*crq), len);
s3c2410_udc_set_ep0_ss(base_addr);
return;
}
dprintk(DEBUG_NORMAL, "bRequest = %d bRequestType %d wLength = %d\n",
crq->bRequest, crq->bRequestType, crq->wLength);
/* cope with automagic for some standard requests. */
dev->req_std = (crq->bRequestType & USB_TYPE_MASK)
== USB_TYPE_STANDARD;
dev->req_config = 0;
dev->req_pending = 1;
switch (crq->bRequest) {
case USB_REQ_SET_CONFIGURATION:
dprintk(DEBUG_NORMAL, "USB_REQ_SET_CONFIGURATION ...\n");
if (crq->bRequestType == USB_RECIP_DEVICE) {
dev->req_config = 1;
s3c2410_udc_set_ep0_de_out(base_addr);
}
break;
case USB_REQ_SET_INTERFACE:
dprintk(DEBUG_NORMAL, "USB_REQ_SET_INTERFACE ...\n");
if (crq->bRequestType == USB_RECIP_INTERFACE) {
dev->req_config = 1;
s3c2410_udc_set_ep0_de_out(base_addr);
}
break;
case USB_REQ_SET_ADDRESS:
dprintk(DEBUG_NORMAL, "USB_REQ_SET_ADDRESS ...\n");
if (crq->bRequestType == USB_RECIP_DEVICE) {
tmp = crq->wValue & 0x7F;
dev->address = tmp;
udc_write((tmp | S3C2410_UDC_FUNCADDR_UPDATE),
S3C2410_UDC_FUNC_ADDR_REG);
s3c2410_udc_set_ep0_de_out(base_addr);
return;
}
break;
case USB_REQ_GET_STATUS:
dprintk(DEBUG_NORMAL, "USB_REQ_GET_STATUS ...\n");
s3c2410_udc_clear_ep0_opr(base_addr);
if (dev->req_std) {
if (!s3c2410_udc_get_status(dev, crq))
return;
}
break;
case USB_REQ_CLEAR_FEATURE:
s3c2410_udc_clear_ep0_opr(base_addr);
if (crq->bRequestType != USB_RECIP_ENDPOINT)
break;
if (crq->wValue != USB_ENDPOINT_HALT || crq->wLength != 0)
break;
s3c2410_udc_set_halt(&dev->ep[crq->wIndex & 0x7f].ep, 0);
s3c2410_udc_set_ep0_de_out(base_addr);
return;
case USB_REQ_SET_FEATURE:
s3c2410_udc_clear_ep0_opr(base_addr);
if (crq->bRequestType != USB_RECIP_ENDPOINT)
break;
if (crq->wValue != USB_ENDPOINT_HALT || crq->wLength != 0)
break;
s3c2410_udc_set_halt(&dev->ep[crq->wIndex & 0x7f].ep, 1);
s3c2410_udc_set_ep0_de_out(base_addr);
return;
default:
s3c2410_udc_clear_ep0_opr(base_addr);
break;
}
if (crq->bRequestType & USB_DIR_IN)
dev->ep0state = EP0_IN_DATA_PHASE;
else
dev->ep0state = EP0_OUT_DATA_PHASE;
if (!dev->driver)
return;
/* deliver the request to the gadget driver */
ret = dev->driver->setup(&dev->gadget, crq);
if (ret < 0) {
if (dev->req_config) {
dprintk(DEBUG_NORMAL, "config change %02x fail %d?\n",
crq->bRequest, ret);
return;
}
if (ret == -EOPNOTSUPP)
dprintk(DEBUG_NORMAL, "Operation not supported\n");
else
dprintk(DEBUG_NORMAL,
"dev->driver->setup failed. (%d)\n", ret);
udelay(5);
s3c2410_udc_set_ep0_ss(base_addr);
s3c2410_udc_set_ep0_de_out(base_addr);
dev->ep0state = EP0_IDLE;
/* deferred i/o == no response yet */
} else if (dev->req_pending) {
dprintk(DEBUG_VERBOSE, "dev->req_pending... what now?\n");
dev->req_pending = 0;
}
dprintk(DEBUG_VERBOSE, "ep0state %s\n", ep0states[dev->ep0state]);
}
static void s3c2410_udc_handle_ep0(struct s3c2410_udc *dev)
{
u32 ep0csr;
struct s3c2410_ep *ep = &dev->ep[0];
struct s3c2410_request *req;
struct usb_ctrlrequest crq;
if (list_empty(&ep->queue))
req = NULL;
else
req = list_entry(ep->queue.next, struct s3c2410_request, queue);
/* We make the assumption that S3C2410_UDC_IN_CSR1_REG equal to
* S3C2410_UDC_EP0_CSR_REG when index is zero */
udc_write(0, S3C2410_UDC_INDEX_REG);
ep0csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
dprintk(DEBUG_NORMAL, "ep0csr %x ep0state %s\n",
ep0csr, ep0states[dev->ep0state]);
/* clear stall status */
if (ep0csr & S3C2410_UDC_EP0_CSR_SENTSTL) {
s3c2410_udc_nuke(dev, ep, -EPIPE);
dprintk(DEBUG_NORMAL, "... clear SENT_STALL ...\n");
s3c2410_udc_clear_ep0_sst(base_addr);
dev->ep0state = EP0_IDLE;
return;
}
/* clear setup end */
if (ep0csr & S3C2410_UDC_EP0_CSR_SE) {
dprintk(DEBUG_NORMAL, "... serviced SETUP_END ...\n");
s3c2410_udc_nuke(dev, ep, 0);
s3c2410_udc_clear_ep0_se(base_addr);
dev->ep0state = EP0_IDLE;
}
switch (dev->ep0state) {
case EP0_IDLE:
s3c2410_udc_handle_ep0_idle(dev, ep, &crq, ep0csr);
break;
case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR etc */
dprintk(DEBUG_NORMAL, "EP0_IN_DATA_PHASE ... what now?\n");
if (!(ep0csr & S3C2410_UDC_EP0_CSR_IPKRDY) && req)
s3c2410_udc_write_fifo(ep, req);
break;
case EP0_OUT_DATA_PHASE: /* SET_DESCRIPTOR etc */
dprintk(DEBUG_NORMAL, "EP0_OUT_DATA_PHASE ... what now?\n");
if ((ep0csr & S3C2410_UDC_EP0_CSR_OPKRDY) && req)
s3c2410_udc_read_fifo(ep, req);
break;
case EP0_END_XFER:
dprintk(DEBUG_NORMAL, "EP0_END_XFER ... what now?\n");
dev->ep0state = EP0_IDLE;
break;
case EP0_STALL:
dprintk(DEBUG_NORMAL, "EP0_STALL ... what now?\n");
dev->ep0state = EP0_IDLE;
break;
}
}
/*
* handle_ep - Manage I/O endpoints
*/
static void s3c2410_udc_handle_ep(struct s3c2410_ep *ep)
{
struct s3c2410_request *req;
int is_in = ep->bEndpointAddress & USB_DIR_IN;
u32 ep_csr1;
u32 idx;
if (likely(!list_empty(&ep->queue)))
req = list_entry(ep->queue.next,
struct s3c2410_request, queue);
else
req = NULL;
idx = ep->bEndpointAddress & 0x7F;
if (is_in) {
udc_write(idx, S3C2410_UDC_INDEX_REG);
ep_csr1 = udc_read(S3C2410_UDC_IN_CSR1_REG);
dprintk(DEBUG_VERBOSE, "ep%01d write csr:%02x %d\n",
idx, ep_csr1, req ? 1 : 0);
if (ep_csr1 & S3C2410_UDC_ICSR1_SENTSTL) {
dprintk(DEBUG_VERBOSE, "st\n");
udc_write(idx, S3C2410_UDC_INDEX_REG);
udc_write(ep_csr1 & ~S3C2410_UDC_ICSR1_SENTSTL,
S3C2410_UDC_IN_CSR1_REG);
return;
}
if (!(ep_csr1 & S3C2410_UDC_ICSR1_PKTRDY) && req)
s3c2410_udc_write_fifo(ep, req);
} else {
udc_write(idx, S3C2410_UDC_INDEX_REG);
ep_csr1 = udc_read(S3C2410_UDC_OUT_CSR1_REG);
dprintk(DEBUG_VERBOSE, "ep%01d rd csr:%02x\n", idx, ep_csr1);
if (ep_csr1 & S3C2410_UDC_OCSR1_SENTSTL) {
udc_write(idx, S3C2410_UDC_INDEX_REG);
udc_write(ep_csr1 & ~S3C2410_UDC_OCSR1_SENTSTL,
S3C2410_UDC_OUT_CSR1_REG);
return;
}
if ((ep_csr1 & S3C2410_UDC_OCSR1_PKTRDY) && req)
s3c2410_udc_read_fifo(ep, req);
}
}
/*
* s3c2410_udc_irq - interrupt handler
*/
static irqreturn_t s3c2410_udc_irq(int dummy, void *_dev)
{
struct s3c2410_udc *dev = _dev;
int usb_status;
int usbd_status;
int pwr_reg;
int ep0csr;
int i;
u32 idx, idx2;
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
/* Driver connected ? */
if (!dev->driver) {
/* Clear interrupts */
udc_write(udc_read(S3C2410_UDC_USB_INT_REG),
S3C2410_UDC_USB_INT_REG);
udc_write(udc_read(S3C2410_UDC_EP_INT_REG),
S3C2410_UDC_EP_INT_REG);
}
/* Save index */
idx = udc_read(S3C2410_UDC_INDEX_REG);
/* Read status registers */
usb_status = udc_read(S3C2410_UDC_USB_INT_REG);
usbd_status = udc_read(S3C2410_UDC_EP_INT_REG);
pwr_reg = udc_read(S3C2410_UDC_PWR_REG);
udc_writeb(base_addr, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
ep0csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
dprintk(DEBUG_NORMAL, "usbs=%02x, usbds=%02x, pwr=%02x ep0csr=%02x\n",
usb_status, usbd_status, pwr_reg, ep0csr);
/*
* Now, handle interrupts. There's two types :
* - Reset, Resume, Suspend coming -> usb_int_reg
* - EP -> ep_int_reg
*/
/* RESET */
if (usb_status & S3C2410_UDC_USBINT_RESET) {
/* two kind of reset :
* - reset start -> pwr reg = 8
* - reset end -> pwr reg = 0
**/
dprintk(DEBUG_NORMAL, "USB reset csr %x pwr %x\n",
ep0csr, pwr_reg);
dev->gadget.speed = USB_SPEED_UNKNOWN;
udc_write(0x00, S3C2410_UDC_INDEX_REG);
udc_write((dev->ep[0].ep.maxpacket & 0x7ff) >> 3,
S3C2410_UDC_MAXP_REG);
dev->address = 0;
dev->ep0state = EP0_IDLE;
dev->gadget.speed = USB_SPEED_FULL;
/* clear interrupt */
udc_write(S3C2410_UDC_USBINT_RESET,
S3C2410_UDC_USB_INT_REG);
udc_write(idx, S3C2410_UDC_INDEX_REG);
spin_unlock_irqrestore(&dev->lock, flags);
return IRQ_HANDLED;
}
/* RESUME */
if (usb_status & S3C2410_UDC_USBINT_RESUME) {
dprintk(DEBUG_NORMAL, "USB resume\n");
/* clear interrupt */
udc_write(S3C2410_UDC_USBINT_RESUME,
S3C2410_UDC_USB_INT_REG);
if (dev->gadget.speed != USB_SPEED_UNKNOWN
&& dev->driver
&& dev->driver->resume)
dev->driver->resume(&dev->gadget);
}
/* SUSPEND */
if (usb_status & S3C2410_UDC_USBINT_SUSPEND) {
dprintk(DEBUG_NORMAL, "USB suspend\n");
/* clear interrupt */
udc_write(S3C2410_UDC_USBINT_SUSPEND,
S3C2410_UDC_USB_INT_REG);
if (dev->gadget.speed != USB_SPEED_UNKNOWN
&& dev->driver
&& dev->driver->suspend)
dev->driver->suspend(&dev->gadget);
dev->ep0state = EP0_IDLE;
}
/* EP */
/* control traffic */
/* check on ep0csr != 0 is not a good idea as clearing in_pkt_ready
* generate an interrupt
*/
if (usbd_status & S3C2410_UDC_INT_EP0) {
dprintk(DEBUG_VERBOSE, "USB ep0 irq\n");
/* Clear the interrupt bit by setting it to 1 */
udc_write(S3C2410_UDC_INT_EP0, S3C2410_UDC_EP_INT_REG);
s3c2410_udc_handle_ep0(dev);
}
/* endpoint data transfers */
for (i = 1; i < S3C2410_ENDPOINTS; i++) {
u32 tmp = 1 << i;
if (usbd_status & tmp) {
dprintk(DEBUG_VERBOSE, "USB ep%d irq\n", i);
/* Clear the interrupt bit by setting it to 1 */
udc_write(tmp, S3C2410_UDC_EP_INT_REG);
s3c2410_udc_handle_ep(&dev->ep[i]);
}
}
/* what else causes this interrupt? a receive! who is it? */
if (!usb_status && !usbd_status && !pwr_reg && !ep0csr) {
for (i = 1; i < S3C2410_ENDPOINTS; i++) {
idx2 = udc_read(S3C2410_UDC_INDEX_REG);
udc_write(i, S3C2410_UDC_INDEX_REG);
if (udc_read(S3C2410_UDC_OUT_CSR1_REG) & 0x1)
s3c2410_udc_handle_ep(&dev->ep[i]);
/* restore index */
udc_write(idx2, S3C2410_UDC_INDEX_REG);
}
}
dprintk(DEBUG_VERBOSE, "irq: %d s3c2410_udc_done.\n", irq_usbd);
/* Restore old index */
udc_write(idx, S3C2410_UDC_INDEX_REG);
spin_unlock_irqrestore(&dev->lock, flags);
return IRQ_HANDLED;
}
/*------------------------- s3c2410_ep_ops ----------------------------------*/
static inline struct s3c2410_ep *to_s3c2410_ep(struct usb_ep *ep)
{
return container_of(ep, struct s3c2410_ep, ep);
}
static inline struct s3c2410_udc *to_s3c2410_udc(struct usb_gadget *gadget)
{
return container_of(gadget, struct s3c2410_udc, gadget);
}
static inline struct s3c2410_request *to_s3c2410_req(struct usb_request *req)
{
return container_of(req, struct s3c2410_request, req);
}
/*
* s3c2410_udc_ep_enable
*/
static int s3c2410_udc_ep_enable(struct usb_ep *_ep,
const struct usb_endpoint_descriptor *desc)
{
struct s3c2410_udc *dev;
struct s3c2410_ep *ep;
u32 max, tmp;
unsigned long flags;
u32 csr1, csr2;
u32 int_en_reg;
ep = to_s3c2410_ep(_ep);
if (!_ep || !desc
|| _ep->name == ep0name
|| desc->bDescriptorType != USB_DT_ENDPOINT)
return -EINVAL;
dev = ep->dev;
if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
max = usb_endpoint_maxp(desc);
local_irq_save(flags);
_ep->maxpacket = max;
ep->ep.desc = desc;
ep->halted = 0;
ep->bEndpointAddress = desc->bEndpointAddress;
/* set max packet */
udc_write(ep->num, S3C2410_UDC_INDEX_REG);
udc_write(max >> 3, S3C2410_UDC_MAXP_REG);
/* set type, direction, address; reset fifo counters */
if (desc->bEndpointAddress & USB_DIR_IN) {
csr1 = S3C2410_UDC_ICSR1_FFLUSH|S3C2410_UDC_ICSR1_CLRDT;
csr2 = S3C2410_UDC_ICSR2_MODEIN|S3C2410_UDC_ICSR2_DMAIEN;
udc_write(ep->num, S3C2410_UDC_INDEX_REG);
udc_write(csr1, S3C2410_UDC_IN_CSR1_REG);
udc_write(ep->num, S3C2410_UDC_INDEX_REG);
udc_write(csr2, S3C2410_UDC_IN_CSR2_REG);
} else {
/* don't flush in fifo or it will cause endpoint interrupt */
csr1 = S3C2410_UDC_ICSR1_CLRDT;
csr2 = S3C2410_UDC_ICSR2_DMAIEN;
udc_write(ep->num, S3C2410_UDC_INDEX_REG);
udc_write(csr1, S3C2410_UDC_IN_CSR1_REG);
udc_write(ep->num, S3C2410_UDC_INDEX_REG);
udc_write(csr2, S3C2410_UDC_IN_CSR2_REG);
csr1 = S3C2410_UDC_OCSR1_FFLUSH | S3C2410_UDC_OCSR1_CLRDT;
csr2 = S3C2410_UDC_OCSR2_DMAIEN;
udc_write(ep->num, S3C2410_UDC_INDEX_REG);
udc_write(csr1, S3C2410_UDC_OUT_CSR1_REG);
udc_write(ep->num, S3C2410_UDC_INDEX_REG);
udc_write(csr2, S3C2410_UDC_OUT_CSR2_REG);
}
/* enable irqs */
int_en_reg = udc_read(S3C2410_UDC_EP_INT_EN_REG);
udc_write(int_en_reg | (1 << ep->num), S3C2410_UDC_EP_INT_EN_REG);
/* print some debug message */
tmp = desc->bEndpointAddress;
dprintk(DEBUG_NORMAL, "enable %s(%d) ep%x%s-blk max %02x\n",
_ep->name, ep->num, tmp,
desc->bEndpointAddress & USB_DIR_IN ? "in" : "out", max);
local_irq_restore(flags);
s3c2410_udc_set_halt(_ep, 0);
return 0;
}
/*
* s3c2410_udc_ep_disable
*/
static int s3c2410_udc_ep_disable(struct usb_ep *_ep)
{
struct s3c2410_ep *ep = to_s3c2410_ep(_ep);
unsigned long flags;
u32 int_en_reg;
if (!_ep || !ep->ep.desc) {
dprintk(DEBUG_NORMAL, "%s not enabled\n",
_ep ? ep->ep.name : NULL);
return -EINVAL;
}
local_irq_save(flags);
dprintk(DEBUG_NORMAL, "ep_disable: %s\n", _ep->name);
ep->ep.desc = NULL;
ep->halted = 1;
s3c2410_udc_nuke(ep->dev, ep, -ESHUTDOWN);
/* disable irqs */
int_en_reg = udc_read(S3C2410_UDC_EP_INT_EN_REG);
udc_write(int_en_reg & ~(1<<ep->num), S3C2410_UDC_EP_INT_EN_REG);
local_irq_restore(flags);
dprintk(DEBUG_NORMAL, "%s disabled\n", _ep->name);
return 0;
}
/*
* s3c2410_udc_alloc_request
*/
static struct usb_request *
s3c2410_udc_alloc_request(struct usb_ep *_ep, gfp_t mem_flags)
{
struct s3c2410_request *req;
dprintk(DEBUG_VERBOSE, "%s(%p,%d)\n", __func__, _ep, mem_flags);
if (!_ep)
return NULL;
req = kzalloc(sizeof(struct s3c2410_request), mem_flags);
if (!req)
return NULL;
INIT_LIST_HEAD(&req->queue);
return &req->req;
}
/*
* s3c2410_udc_free_request
*/
static void
s3c2410_udc_free_request(struct usb_ep *_ep, struct usb_request *_req)
{
struct s3c2410_ep *ep = to_s3c2410_ep(_ep);
struct s3c2410_request *req = to_s3c2410_req(_req);
dprintk(DEBUG_VERBOSE, "%s(%p,%p)\n", __func__, _ep, _req);
if (!ep || !_req || (!ep->ep.desc && _ep->name != ep0name))
return;
WARN_ON(!list_empty(&req->queue));
kfree(req);
}
/*
* s3c2410_udc_queue
*/
static int s3c2410_udc_queue(struct usb_ep *_ep, struct usb_request *_req,
gfp_t gfp_flags)
{
struct s3c2410_request *req = to_s3c2410_req(_req);
struct s3c2410_ep *ep = to_s3c2410_ep(_ep);
struct s3c2410_udc *dev;
u32 ep_csr = 0;
int fifo_count = 0;
unsigned long flags;
if (unlikely(!_ep || (!ep->ep.desc && ep->ep.name != ep0name))) {
dprintk(DEBUG_NORMAL, "%s: invalid args\n", __func__);
return -EINVAL;
}
dev = ep->dev;
if (unlikely(!dev->driver
|| dev->gadget.speed == USB_SPEED_UNKNOWN)) {
return -ESHUTDOWN;
}
local_irq_save(flags);
if (unlikely(!_req || !_req->complete
|| !_req->buf || !list_empty(&req->queue))) {
if (!_req)
dprintk(DEBUG_NORMAL, "%s: 1 X X X\n", __func__);
else {
dprintk(DEBUG_NORMAL, "%s: 0 %01d %01d %01d\n",
__func__, !_req->complete, !_req->buf,
!list_empty(&req->queue));
}
local_irq_restore(flags);
return -EINVAL;
}
_req->status = -EINPROGRESS;
_req->actual = 0;
dprintk(DEBUG_VERBOSE, "%s: ep%x len %d\n",
__func__, ep->bEndpointAddress, _req->length);
if (ep->bEndpointAddress) {
udc_write(ep->bEndpointAddress & 0x7F, S3C2410_UDC_INDEX_REG);
ep_csr = udc_read((ep->bEndpointAddress & USB_DIR_IN)
? S3C2410_UDC_IN_CSR1_REG
: S3C2410_UDC_OUT_CSR1_REG);
fifo_count = s3c2410_udc_fifo_count_out();
} else {
udc_write(0, S3C2410_UDC_INDEX_REG);
ep_csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
fifo_count = s3c2410_udc_fifo_count_out();
}
/* kickstart this i/o queue? */
if (list_empty(&ep->queue) && !ep->halted) {
if (ep->bEndpointAddress == 0 /* ep0 */) {
switch (dev->ep0state) {
case EP0_IN_DATA_PHASE:
if (!(ep_csr&S3C2410_UDC_EP0_CSR_IPKRDY)
&& s3c2410_udc_write_fifo(ep,
req)) {
dev->ep0state = EP0_IDLE;
req = NULL;
}
break;
case EP0_OUT_DATA_PHASE:
if ((!_req->length)
|| ((ep_csr & S3C2410_UDC_OCSR1_PKTRDY)
&& s3c2410_udc_read_fifo(ep,
req))) {
dev->ep0state = EP0_IDLE;
req = NULL;
}
break;
default:
local_irq_restore(flags);
return -EL2HLT;
}
} else if ((ep->bEndpointAddress & USB_DIR_IN) != 0
&& (!(ep_csr&S3C2410_UDC_OCSR1_PKTRDY))
&& s3c2410_udc_write_fifo(ep, req)) {
req = NULL;
} else if ((ep_csr & S3C2410_UDC_OCSR1_PKTRDY)
&& fifo_count
&& s3c2410_udc_read_fifo(ep, req)) {
req = NULL;
}
}
/* pio or dma irq handler advances the queue. */
if (likely(req))
list_add_tail(&req->queue, &ep->queue);
local_irq_restore(flags);
dprintk(DEBUG_VERBOSE, "%s ok\n", __func__);
return 0;
}
/*
* s3c2410_udc_dequeue
*/
static int s3c2410_udc_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
struct s3c2410_ep *ep = to_s3c2410_ep(_ep);
int retval = -EINVAL;
unsigned long flags;
struct s3c2410_request *req = NULL, *iter;
dprintk(DEBUG_VERBOSE, "%s(%p,%p)\n", __func__, _ep, _req);
if (!the_controller->driver)
return -ESHUTDOWN;
if (!_ep || !_req)
return retval;
local_irq_save(flags);
list_for_each_entry(iter, &ep->queue, queue) {
if (&iter->req != _req)
continue;
list_del_init(&iter->queue);
_req->status = -ECONNRESET;
req = iter;
retval = 0;
break;
}
if (retval == 0) {
dprintk(DEBUG_VERBOSE,
"dequeued req %p from %s, len %d buf %p\n",
req, _ep->name, _req->length, _req->buf);
s3c2410_udc_done(ep, req, -ECONNRESET);
}
local_irq_restore(flags);
return retval;
}
/*
* s3c2410_udc_set_halt
*/
static int s3c2410_udc_set_halt(struct usb_ep *_ep, int value)
{
struct s3c2410_ep *ep = to_s3c2410_ep(_ep);
u32 ep_csr = 0;
unsigned long flags;
u32 idx;
if (unlikely(!_ep || (!ep->ep.desc && ep->ep.name != ep0name))) {
dprintk(DEBUG_NORMAL, "%s: inval 2\n", __func__);
return -EINVAL;
}
local_irq_save(flags);
idx = ep->bEndpointAddress & 0x7F;
if (idx == 0) {
s3c2410_udc_set_ep0_ss(base_addr);
s3c2410_udc_set_ep0_de_out(base_addr);
} else {
udc_write(idx, S3C2410_UDC_INDEX_REG);
ep_csr = udc_read((ep->bEndpointAddress & USB_DIR_IN)
? S3C2410_UDC_IN_CSR1_REG
: S3C2410_UDC_OUT_CSR1_REG);
if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
if (value)
udc_write(ep_csr | S3C2410_UDC_ICSR1_SENDSTL,
S3C2410_UDC_IN_CSR1_REG);
else {
ep_csr &= ~S3C2410_UDC_ICSR1_SENDSTL;
udc_write(ep_csr, S3C2410_UDC_IN_CSR1_REG);
ep_csr |= S3C2410_UDC_ICSR1_CLRDT;
udc_write(ep_csr, S3C2410_UDC_IN_CSR1_REG);
}
} else {
if (value)
udc_write(ep_csr | S3C2410_UDC_OCSR1_SENDSTL,
S3C2410_UDC_OUT_CSR1_REG);
else {
ep_csr &= ~S3C2410_UDC_OCSR1_SENDSTL;
udc_write(ep_csr, S3C2410_UDC_OUT_CSR1_REG);
ep_csr |= S3C2410_UDC_OCSR1_CLRDT;
udc_write(ep_csr, S3C2410_UDC_OUT_CSR1_REG);
}
}
}
ep->halted = value ? 1 : 0;
local_irq_restore(flags);
return 0;
}
static const struct usb_ep_ops s3c2410_ep_ops = {
.enable = s3c2410_udc_ep_enable,
.disable = s3c2410_udc_ep_disable,
.alloc_request = s3c2410_udc_alloc_request,
.free_request = s3c2410_udc_free_request,
.queue = s3c2410_udc_queue,
.dequeue = s3c2410_udc_dequeue,
.set_halt = s3c2410_udc_set_halt,
};
/*------------------------- usb_gadget_ops ----------------------------------*/
/*
* s3c2410_udc_get_frame
*/
static int s3c2410_udc_get_frame(struct usb_gadget *_gadget)
{
int tmp;
dprintk(DEBUG_VERBOSE, "%s()\n", __func__);
tmp = udc_read(S3C2410_UDC_FRAME_NUM2_REG) << 8;
tmp |= udc_read(S3C2410_UDC_FRAME_NUM1_REG);
return tmp;
}
/*
* s3c2410_udc_wakeup
*/
static int s3c2410_udc_wakeup(struct usb_gadget *_gadget)
{
dprintk(DEBUG_NORMAL, "%s()\n", __func__);
return 0;
}
/*
* s3c2410_udc_set_selfpowered
*/
static int s3c2410_udc_set_selfpowered(struct usb_gadget *gadget, int value)
{
struct s3c2410_udc *udc = to_s3c2410_udc(gadget);
dprintk(DEBUG_NORMAL, "%s()\n", __func__);
gadget->is_selfpowered = (value != 0);
if (value)
udc->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
else
udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
return 0;
}
static void s3c2410_udc_disable(struct s3c2410_udc *dev);
static void s3c2410_udc_enable(struct s3c2410_udc *dev);
static int s3c2410_udc_set_pullup(struct s3c2410_udc *udc, int is_on)
{
dprintk(DEBUG_NORMAL, "%s()\n", __func__);
if (udc_info && (udc_info->udc_command || udc->pullup_gpiod)) {
if (is_on)
s3c2410_udc_enable(udc);
else {
if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
if (udc->driver && udc->driver->disconnect)
udc->driver->disconnect(&udc->gadget);
}
s3c2410_udc_disable(udc);
}
} else {
return -EOPNOTSUPP;
}
return 0;
}
static int s3c2410_udc_vbus_session(struct usb_gadget *gadget, int is_active)
{
struct s3c2410_udc *udc = to_s3c2410_udc(gadget);
dprintk(DEBUG_NORMAL, "%s()\n", __func__);
udc->vbus = (is_active != 0);
s3c2410_udc_set_pullup(udc, is_active);
return 0;
}
static int s3c2410_udc_pullup(struct usb_gadget *gadget, int is_on)
{
struct s3c2410_udc *udc = to_s3c2410_udc(gadget);
dprintk(DEBUG_NORMAL, "%s()\n", __func__);
s3c2410_udc_set_pullup(udc, is_on);
return 0;
}
static irqreturn_t s3c2410_udc_vbus_irq(int irq, void *_dev)
{
struct s3c2410_udc *dev = _dev;
unsigned int value;
dprintk(DEBUG_NORMAL, "%s()\n", __func__);
value = gpiod_get_value(dev->vbus_gpiod);
if (value != dev->vbus)
s3c2410_udc_vbus_session(&dev->gadget, value);
return IRQ_HANDLED;
}
static int s3c2410_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
{
dprintk(DEBUG_NORMAL, "%s()\n", __func__);
if (udc_info && udc_info->vbus_draw) {
udc_info->vbus_draw(ma);
return 0;
}
return -ENOTSUPP;
}
static int s3c2410_udc_start(struct usb_gadget *g,
struct usb_gadget_driver *driver);
static int s3c2410_udc_stop(struct usb_gadget *g);
static const struct usb_gadget_ops s3c2410_ops = {
.get_frame = s3c2410_udc_get_frame,
.wakeup = s3c2410_udc_wakeup,
.set_selfpowered = s3c2410_udc_set_selfpowered,
.pullup = s3c2410_udc_pullup,
.vbus_session = s3c2410_udc_vbus_session,
.vbus_draw = s3c2410_vbus_draw,
.udc_start = s3c2410_udc_start,
.udc_stop = s3c2410_udc_stop,
};
static void s3c2410_udc_command(struct s3c2410_udc *udc,
enum s3c2410_udc_cmd_e cmd)
{
if (!udc_info)
return;
if (udc_info->udc_command) {
udc_info->udc_command(cmd);
} else if (udc->pullup_gpiod) {
int value;
switch (cmd) {
case S3C2410_UDC_P_ENABLE:
value = 1;
break;
case S3C2410_UDC_P_DISABLE:
value = 0;
break;
default:
return;
}
gpiod_set_value(udc->pullup_gpiod, value);
}
}
/*------------------------- gadget driver handling---------------------------*/
/*
* s3c2410_udc_disable
*/
static void s3c2410_udc_disable(struct s3c2410_udc *dev)
{
dprintk(DEBUG_NORMAL, "%s()\n", __func__);
/* Disable all interrupts */
udc_write(0x00, S3C2410_UDC_USB_INT_EN_REG);
udc_write(0x00, S3C2410_UDC_EP_INT_EN_REG);
/* Clear the interrupt registers */
udc_write(S3C2410_UDC_USBINT_RESET
| S3C2410_UDC_USBINT_RESUME
| S3C2410_UDC_USBINT_SUSPEND,
S3C2410_UDC_USB_INT_REG);
udc_write(0x1F, S3C2410_UDC_EP_INT_REG);
/* Good bye, cruel world */
s3c2410_udc_command(dev, S3C2410_UDC_P_DISABLE);
/* Set speed to unknown */
dev->gadget.speed = USB_SPEED_UNKNOWN;
}
/*
* s3c2410_udc_reinit
*/
static void s3c2410_udc_reinit(struct s3c2410_udc *dev)
{
u32 i;
/* device/ep0 records init */
INIT_LIST_HEAD(&dev->gadget.ep_list);
INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
dev->ep0state = EP0_IDLE;
for (i = 0; i < S3C2410_ENDPOINTS; i++) {
struct s3c2410_ep *ep = &dev->ep[i];
if (i != 0)
list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
ep->dev = dev;
ep->ep.desc = NULL;
ep->halted = 0;
INIT_LIST_HEAD(&ep->queue);
usb_ep_set_maxpacket_limit(&ep->ep, ep->ep.maxpacket);
}
}
/*
* s3c2410_udc_enable
*/
static void s3c2410_udc_enable(struct s3c2410_udc *dev)
{
int i;
dprintk(DEBUG_NORMAL, "s3c2410_udc_enable called\n");
/* dev->gadget.speed = USB_SPEED_UNKNOWN; */
dev->gadget.speed = USB_SPEED_FULL;
/* Set MAXP for all endpoints */
for (i = 0; i < S3C2410_ENDPOINTS; i++) {
udc_write(i, S3C2410_UDC_INDEX_REG);
udc_write((dev->ep[i].ep.maxpacket & 0x7ff) >> 3,
S3C2410_UDC_MAXP_REG);
}
/* Set default power state */
udc_write(DEFAULT_POWER_STATE, S3C2410_UDC_PWR_REG);
/* Enable reset and suspend interrupt interrupts */
udc_write(S3C2410_UDC_USBINT_RESET | S3C2410_UDC_USBINT_SUSPEND,
S3C2410_UDC_USB_INT_EN_REG);
/* Enable ep0 interrupt */
udc_write(S3C2410_UDC_INT_EP0, S3C2410_UDC_EP_INT_EN_REG);
/* time to say "hello, world" */
s3c2410_udc_command(dev, S3C2410_UDC_P_ENABLE);
}
static int s3c2410_udc_start(struct usb_gadget *g,
struct usb_gadget_driver *driver)
{
struct s3c2410_udc *udc = to_s3c2410(g);
dprintk(DEBUG_NORMAL, "%s() '%s'\n", __func__, driver->driver.name);
/* Hook the driver */
udc->driver = driver;
/* Enable udc */
s3c2410_udc_enable(udc);
return 0;
}
static int s3c2410_udc_stop(struct usb_gadget *g)
{
struct s3c2410_udc *udc = to_s3c2410(g);
udc->driver = NULL;
/* Disable udc */
s3c2410_udc_disable(udc);
return 0;
}
/*---------------------------------------------------------------------------*/
static struct s3c2410_udc memory = {
.gadget = {
.ops = &s3c2410_ops,
.ep0 = &memory.ep[0].ep,
.name = gadget_name,
.dev = {
.init_name = "gadget",
},
},
/* control endpoint */
.ep[0] = {
.num = 0,
.ep = {
.name = ep0name,
.ops = &s3c2410_ep_ops,
.maxpacket = EP0_FIFO_SIZE,
.caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL,
USB_EP_CAPS_DIR_ALL),
},
.dev = &memory,
},
/* first group of endpoints */
.ep[1] = {
.num = 1,
.ep = {
.name = "ep1-bulk",
.ops = &s3c2410_ep_ops,
.maxpacket = EP_FIFO_SIZE,
.caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK,
USB_EP_CAPS_DIR_ALL),
},
.dev = &memory,
.fifo_size = EP_FIFO_SIZE,
.bEndpointAddress = 1,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
},
.ep[2] = {
.num = 2,
.ep = {
.name = "ep2-bulk",
.ops = &s3c2410_ep_ops,
.maxpacket = EP_FIFO_SIZE,
.caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK,
USB_EP_CAPS_DIR_ALL),
},
.dev = &memory,
.fifo_size = EP_FIFO_SIZE,
.bEndpointAddress = 2,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
},
.ep[3] = {
.num = 3,
.ep = {
.name = "ep3-bulk",
.ops = &s3c2410_ep_ops,
.maxpacket = EP_FIFO_SIZE,
.caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK,
USB_EP_CAPS_DIR_ALL),
},
.dev = &memory,
.fifo_size = EP_FIFO_SIZE,
.bEndpointAddress = 3,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
},
.ep[4] = {
.num = 4,
.ep = {
.name = "ep4-bulk",
.ops = &s3c2410_ep_ops,
.maxpacket = EP_FIFO_SIZE,
.caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK,
USB_EP_CAPS_DIR_ALL),
},
.dev = &memory,
.fifo_size = EP_FIFO_SIZE,
.bEndpointAddress = 4,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
}
};
/*
* probe - binds to the platform device
*/
static int s3c2410_udc_probe(struct platform_device *pdev)
{
struct s3c2410_udc *udc = &memory;
struct device *dev = &pdev->dev;
int retval;
int irq;
dev_dbg(dev, "%s()\n", __func__);
usb_bus_clock = clk_get(NULL, "usb-bus-gadget");
if (IS_ERR(usb_bus_clock)) {
dev_err(dev, "failed to get usb bus clock source\n");
return PTR_ERR(usb_bus_clock);
}
clk_prepare_enable(usb_bus_clock);
udc_clock = clk_get(NULL, "usb-device");
if (IS_ERR(udc_clock)) {
dev_err(dev, "failed to get udc clock source\n");
retval = PTR_ERR(udc_clock);
goto err_usb_bus_clk;
}
clk_prepare_enable(udc_clock);
mdelay(10);
dev_dbg(dev, "got and enabled clocks\n");
if (strncmp(pdev->name, "s3c2440", 7) == 0) {
dev_info(dev, "S3C2440: increasing FIFO to 128 bytes\n");
memory.ep[1].fifo_size = S3C2440_EP_FIFO_SIZE;
memory.ep[2].fifo_size = S3C2440_EP_FIFO_SIZE;
memory.ep[3].fifo_size = S3C2440_EP_FIFO_SIZE;
memory.ep[4].fifo_size = S3C2440_EP_FIFO_SIZE;
}
spin_lock_init(&udc->lock);
udc_info = dev_get_platdata(&pdev->dev);
base_addr = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base_addr)) {
retval = PTR_ERR(base_addr);
goto err_udc_clk;
}
the_controller = udc;
platform_set_drvdata(pdev, udc);
s3c2410_udc_disable(udc);
s3c2410_udc_reinit(udc);
irq_usbd = platform_get_irq(pdev, 0);
if (irq_usbd < 0) {
retval = irq_usbd;
goto err_udc_clk;
}
/* irq setup after old hardware state is cleaned up */
retval = request_irq(irq_usbd, s3c2410_udc_irq,
0, gadget_name, udc);
if (retval != 0) {
dev_err(dev, "cannot get irq %i, err %d\n", irq_usbd, retval);
retval = -EBUSY;
goto err_udc_clk;
}
dev_dbg(dev, "got irq %i\n", irq_usbd);
udc->vbus_gpiod = gpiod_get_optional(dev, "vbus", GPIOD_IN);
if (IS_ERR(udc->vbus_gpiod)) {
retval = PTR_ERR(udc->vbus_gpiod);
goto err_int;
}
if (udc->vbus_gpiod) {
gpiod_set_consumer_name(udc->vbus_gpiod, "udc vbus");
irq = gpiod_to_irq(udc->vbus_gpiod);
if (irq < 0) {
dev_err(dev, "no irq for gpio vbus pin\n");
retval = irq;
goto err_gpio_claim;
}
retval = request_irq(irq, s3c2410_udc_vbus_irq,
IRQF_TRIGGER_RISING
| IRQF_TRIGGER_FALLING | IRQF_SHARED,
gadget_name, udc);
if (retval != 0) {
dev_err(dev, "can't get vbus irq %d, err %d\n",
irq, retval);
retval = -EBUSY;
goto err_gpio_claim;
}
dev_dbg(dev, "got irq %i\n", irq);
} else {
udc->vbus = 1;
}
udc->pullup_gpiod = gpiod_get_optional(dev, "pullup", GPIOD_OUT_LOW);
if (IS_ERR(udc->pullup_gpiod)) {
retval = PTR_ERR(udc->pullup_gpiod);
goto err_vbus_irq;
}
gpiod_set_consumer_name(udc->pullup_gpiod, "udc pullup");
retval = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
if (retval)
goto err_add_udc;
debugfs_create_file("registers", S_IRUGO, s3c2410_udc_debugfs_root, udc,
&s3c2410_udc_debugfs_fops);
dev_dbg(dev, "probe ok\n");
return 0;
err_add_udc:
err_vbus_irq:
if (udc->vbus_gpiod)
free_irq(gpiod_to_irq(udc->vbus_gpiod), udc);
err_gpio_claim:
err_int:
free_irq(irq_usbd, udc);
err_udc_clk:
clk_disable_unprepare(udc_clock);
clk_put(udc_clock);
udc_clock = NULL;
err_usb_bus_clk:
clk_disable_unprepare(usb_bus_clock);
clk_put(usb_bus_clock);
usb_bus_clock = NULL;
return retval;
}
/*
* s3c2410_udc_remove
*/
static int s3c2410_udc_remove(struct platform_device *pdev)
{
struct s3c2410_udc *udc = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "%s()\n", __func__);
if (udc->driver)
return -EBUSY;
usb_del_gadget_udc(&udc->gadget);
debugfs_remove(debugfs_lookup("registers", s3c2410_udc_debugfs_root));
if (udc->vbus_gpiod)
free_irq(gpiod_to_irq(udc->vbus_gpiod), udc);
free_irq(irq_usbd, udc);
if (!IS_ERR(udc_clock) && udc_clock != NULL) {
clk_disable_unprepare(udc_clock);
clk_put(udc_clock);
udc_clock = NULL;
}
if (!IS_ERR(usb_bus_clock) && usb_bus_clock != NULL) {
clk_disable_unprepare(usb_bus_clock);
clk_put(usb_bus_clock);
usb_bus_clock = NULL;
}
dev_dbg(&pdev->dev, "%s: remove ok\n", __func__);
return 0;
}
#ifdef CONFIG_PM
static int
s3c2410_udc_suspend(struct platform_device *pdev, pm_message_t message)
{
struct s3c2410_udc *udc = platform_get_drvdata(pdev);
s3c2410_udc_command(udc, S3C2410_UDC_P_DISABLE);
return 0;
}
static int s3c2410_udc_resume(struct platform_device *pdev)
{
struct s3c2410_udc *udc = platform_get_drvdata(pdev);
s3c2410_udc_command(udc, S3C2410_UDC_P_ENABLE);
return 0;
}
#else
#define s3c2410_udc_suspend NULL
#define s3c2410_udc_resume NULL
#endif
static const struct platform_device_id s3c_udc_ids[] = {
{ "s3c2410-usbgadget", },
{ "s3c2440-usbgadget", },
{ }
};
MODULE_DEVICE_TABLE(platform, s3c_udc_ids);
static struct platform_driver udc_driver_24x0 = {
.driver = {
.name = "s3c24x0-usbgadget",
},
.probe = s3c2410_udc_probe,
.remove = s3c2410_udc_remove,
.suspend = s3c2410_udc_suspend,
.resume = s3c2410_udc_resume,
.id_table = s3c_udc_ids,
};
static int __init udc_init(void)
{
int retval;
dprintk(DEBUG_NORMAL, "%s\n", gadget_name);
s3c2410_udc_debugfs_root = debugfs_create_dir(gadget_name,
usb_debug_root);
retval = platform_driver_register(&udc_driver_24x0);
if (retval)
goto err;
return 0;
err:
debugfs_remove(s3c2410_udc_debugfs_root);
return retval;
}
static void __exit udc_exit(void)
{
platform_driver_unregister(&udc_driver_24x0);
debugfs_remove_recursive(s3c2410_udc_debugfs_root);
}
module_init(udc_init);
module_exit(udc_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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