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lh7a40x_udc.c
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/*
* linux/drivers/usb/gadget/lh7a40x_udc.c
* Sharp LH7A40x on-chip full speed USB device controllers
*
* Copyright (C) 2004 Mikko Lahteenmaki, Nordic ID
* Copyright (C) 2004 Bo Henriksen, Nordic ID
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "lh7a40x_udc.h"
//#define DEBUG printk
//#define DEBUG_EP0 printk
//#define DEBUG_SETUP printk
#ifndef DEBUG_EP0
# define DEBUG_EP0(fmt,args...)
#endif
#ifndef DEBUG_SETUP
# define DEBUG_SETUP(fmt,args...)
#endif
#ifndef DEBUG
# define NO_STATES
# define DEBUG(fmt,args...)
#endif
#define DRIVER_DESC "LH7A40x USB Device Controller"
#define DRIVER_VERSION __DATE__
#ifndef _BIT /* FIXME - what happended to _BIT in 2.6.7bk18? */
#define _BIT(x) (1<<(x))
#endif
struct lh7a40x_udc *the_controller;
static const char driver_name[] = "lh7a40x_udc";
static const char driver_desc[] = DRIVER_DESC;
static const char ep0name[] = "ep0-control";
/*
Local definintions.
*/
#ifndef NO_STATES
static char *state_names[] = {
"WAIT_FOR_SETUP",
"DATA_STATE_XMIT",
"DATA_STATE_NEED_ZLP",
"WAIT_FOR_OUT_STATUS",
"DATA_STATE_RECV"
};
#endif
/*
Local declarations.
*/
static int lh7a40x_ep_enable(struct usb_ep *ep,
const struct usb_endpoint_descriptor *);
static int lh7a40x_ep_disable(struct usb_ep *ep);
static struct usb_request *lh7a40x_alloc_request(struct usb_ep *ep, gfp_t);
static void lh7a40x_free_request(struct usb_ep *ep, struct usb_request *);
static int lh7a40x_queue(struct usb_ep *ep, struct usb_request *, gfp_t);
static int lh7a40x_dequeue(struct usb_ep *ep, struct usb_request *);
static int lh7a40x_set_halt(struct usb_ep *ep, int);
static int lh7a40x_fifo_status(struct usb_ep *ep);
static void lh7a40x_fifo_flush(struct usb_ep *ep);
static void lh7a40x_ep0_kick(struct lh7a40x_udc *dev, struct lh7a40x_ep *ep);
static void lh7a40x_handle_ep0(struct lh7a40x_udc *dev, u32 intr);
static void done(struct lh7a40x_ep *ep, struct lh7a40x_request *req,
int status);
static void pio_irq_enable(int bEndpointAddress);
static void pio_irq_disable(int bEndpointAddress);
static void stop_activity(struct lh7a40x_udc *dev,
struct usb_gadget_driver *driver);
static void flush(struct lh7a40x_ep *ep);
static void udc_enable(struct lh7a40x_udc *dev);
static void udc_set_address(struct lh7a40x_udc *dev, unsigned char address);
static struct usb_ep_ops lh7a40x_ep_ops = {
.enable = lh7a40x_ep_enable,
.disable = lh7a40x_ep_disable,
.alloc_request = lh7a40x_alloc_request,
.free_request = lh7a40x_free_request,
.queue = lh7a40x_queue,
.dequeue = lh7a40x_dequeue,
.set_halt = lh7a40x_set_halt,
.fifo_status = lh7a40x_fifo_status,
.fifo_flush = lh7a40x_fifo_flush,
};
/* Inline code */
static __inline__ int write_packet(struct lh7a40x_ep *ep,
struct lh7a40x_request *req, int max)
{
u8 *buf;
int length, count;
volatile u32 *fifo = (volatile u32 *)ep->fifo;
buf = req->req.buf + req->req.actual;
prefetch(buf);
length = req->req.length - req->req.actual;
length = min(length, max);
req->req.actual += length;
DEBUG("Write %d (max %d), fifo %p\n", length, max, fifo);
count = length;
while (count--) {
*fifo = *buf++;
}
return length;
}
static __inline__ void usb_set_index(u32 ep)
{
*(volatile u32 *)io_p2v(USB_INDEX) = ep;
}
static __inline__ u32 usb_read(u32 port)
{
return *(volatile u32 *)io_p2v(port);
}
static __inline__ void usb_write(u32 val, u32 port)
{
*(volatile u32 *)io_p2v(port) = val;
}
static __inline__ void usb_set(u32 val, u32 port)
{
volatile u32 *ioport = (volatile u32 *)io_p2v(port);
u32 after = (*ioport) | val;
*ioport = after;
}
static __inline__ void usb_clear(u32 val, u32 port)
{
volatile u32 *ioport = (volatile u32 *)io_p2v(port);
u32 after = (*ioport) & ~val;
*ioport = after;
}
/*-------------------------------------------------------------------------*/
#define GPIO_PORTC_DR (0x80000E08)
#define GPIO_PORTC_DDR (0x80000E18)
#define GPIO_PORTC_PDR (0x80000E70)
/* get port C pin data register */
#define get_portc_pdr(bit) ((usb_read(GPIO_PORTC_PDR) & _BIT(bit)) != 0)
/* get port C data direction register */
#define get_portc_ddr(bit) ((usb_read(GPIO_PORTC_DDR) & _BIT(bit)) != 0)
/* set port C data register */
#define set_portc_dr(bit, val) (val ? usb_set(_BIT(bit), GPIO_PORTC_DR) : usb_clear(_BIT(bit), GPIO_PORTC_DR))
/* set port C data direction register */
#define set_portc_ddr(bit, val) (val ? usb_set(_BIT(bit), GPIO_PORTC_DDR) : usb_clear(_BIT(bit), GPIO_PORTC_DDR))
/*
* LPD7A404 GPIO's:
* Port C bit 1 = USB Port 1 Power Enable
* Port C bit 2 = USB Port 1 Data Carrier Detect
*/
#define is_usb_connected() get_portc_pdr(2)
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
static const char proc_node_name[] = "driver/udc";
static int
udc_proc_read(char *page, char **start, off_t off, int count,
int *eof, void *_dev)
{
char *buf = page;
struct lh7a40x_udc *dev = _dev;
char *next = buf;
unsigned size = count;
unsigned long flags;
int t;
if (off != 0)
return 0;
local_irq_save(flags);
/* basic device status */
t = scnprintf(next, size,
DRIVER_DESC "\n"
"%s version: %s\n"
"Gadget driver: %s\n"
"Host: %s\n\n",
driver_name, DRIVER_VERSION,
dev->driver ? dev->driver->driver.name : "(none)",
is_usb_connected()? "full speed" : "disconnected");
size -= t;
next += t;
t = scnprintf(next, size,
"GPIO:\n"
" Port C bit 1: %d, dir %d\n"
" Port C bit 2: %d, dir %d\n\n",
get_portc_pdr(1), get_portc_ddr(1),
get_portc_pdr(2), get_portc_ddr(2)
);
size -= t;
next += t;
t = scnprintf(next, size,
"DCP pullup: %d\n\n",
(usb_read(USB_PM) & PM_USB_DCP) != 0);
size -= t;
next += t;
local_irq_restore(flags);
*eof = 1;
return count - size;
}
#define create_proc_files() create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev)
#define remove_proc_files() remove_proc_entry(proc_node_name, NULL)
#else /* !CONFIG_USB_GADGET_DEBUG_FILES */
#define create_proc_files() do {} while (0)
#define remove_proc_files() do {} while (0)
#endif /* CONFIG_USB_GADGET_DEBUG_FILES */
/*
* udc_disable - disable USB device controller
*/
static void udc_disable(struct lh7a40x_udc *dev)
{
DEBUG("%s, %p\n", __func__, dev);
udc_set_address(dev, 0);
/* Disable interrupts */
usb_write(0, USB_IN_INT_EN);
usb_write(0, USB_OUT_INT_EN);
usb_write(0, USB_INT_EN);
/* Disable the USB */
usb_write(0, USB_PM);
#ifdef CONFIG_ARCH_LH7A404
/* Disable USB power */
set_portc_dr(1, 0);
#endif
/* if hardware supports it, disconnect from usb */
/* make_usb_disappear(); */
dev->ep0state = WAIT_FOR_SETUP;
dev->gadget.speed = USB_SPEED_UNKNOWN;
dev->usb_address = 0;
}
/*
* udc_reinit - initialize software state
*/
static void udc_reinit(struct lh7a40x_udc *dev)
{
u32 i;
DEBUG("%s, %p\n", __func__, dev);
/* device/ep0 records init */
INIT_LIST_HEAD(&dev->gadget.ep_list);
INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
dev->ep0state = WAIT_FOR_SETUP;
/* basic endpoint records init */
for (i = 0; i < UDC_MAX_ENDPOINTS; i++) {
struct lh7a40x_ep *ep = &dev->ep[i];
if (i != 0)
list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
ep->desc = 0;
ep->stopped = 0;
INIT_LIST_HEAD(&ep->queue);
ep->pio_irqs = 0;
}
/* the rest was statically initialized, and is read-only */
}
#define BYTES2MAXP(x) (x / 8)
#define MAXP2BYTES(x) (x * 8)
/* until it's enabled, this UDC should be completely invisible
* to any USB host.
*/
static void udc_enable(struct lh7a40x_udc *dev)
{
int ep;
DEBUG("%s, %p\n", __func__, dev);
dev->gadget.speed = USB_SPEED_UNKNOWN;
#ifdef CONFIG_ARCH_LH7A404
/* Set Port C bit 1 & 2 as output */
set_portc_ddr(1, 1);
set_portc_ddr(2, 1);
/* Enable USB power */
set_portc_dr(1, 0);
#endif
/*
* C.f Chapter 18.1.3.1 Initializing the USB
*/
/* Disable the USB */
usb_clear(PM_USB_ENABLE, USB_PM);
/* Reset APB & I/O sides of the USB */
usb_set(USB_RESET_APB | USB_RESET_IO, USB_RESET);
mdelay(5);
usb_clear(USB_RESET_APB | USB_RESET_IO, USB_RESET);
/* Set MAXP values for each */
for (ep = 0; ep < UDC_MAX_ENDPOINTS; ep++) {
struct lh7a40x_ep *ep_reg = &dev->ep[ep];
u32 csr;
usb_set_index(ep);
switch (ep_reg->ep_type) {
case ep_bulk_in:
case ep_interrupt:
usb_clear(USB_IN_CSR2_USB_DMA_EN | USB_IN_CSR2_AUTO_SET,
ep_reg->csr2);
/* Fall through */
case ep_control:
usb_write(BYTES2MAXP(ep_maxpacket(ep_reg)),
USB_IN_MAXP);
break;
case ep_bulk_out:
usb_clear(USB_OUT_CSR2_USB_DMA_EN |
USB_OUT_CSR2_AUTO_CLR, ep_reg->csr2);
usb_write(BYTES2MAXP(ep_maxpacket(ep_reg)),
USB_OUT_MAXP);
break;
}
/* Read & Write CSR1, just in case */
csr = usb_read(ep_reg->csr1);
usb_write(csr, ep_reg->csr1);
flush(ep_reg);
}
/* Disable interrupts */
usb_write(0, USB_IN_INT_EN);
usb_write(0, USB_OUT_INT_EN);
usb_write(0, USB_INT_EN);
/* Enable interrupts */
usb_set(USB_IN_INT_EP0, USB_IN_INT_EN);
usb_set(USB_INT_RESET_INT | USB_INT_RESUME_INT, USB_INT_EN);
/* Dont enable rest of the interrupts */
/* usb_set(USB_IN_INT_EP3 | USB_IN_INT_EP1 | USB_IN_INT_EP0, USB_IN_INT_EN);
usb_set(USB_OUT_INT_EP2, USB_OUT_INT_EN); */
/* Enable SUSPEND */
usb_set(PM_ENABLE_SUSPEND, USB_PM);
/* Enable the USB */
usb_set(PM_USB_ENABLE, USB_PM);
#ifdef CONFIG_ARCH_LH7A404
/* NOTE: DOES NOT WORK! */
/* Let host detect UDC:
* Software must write a 0 to the PMR:DCP_CTRL bit to turn this
* transistor on and pull the USBDP pin HIGH.
*/
/* usb_clear(PM_USB_DCP, USB_PM);
usb_set(PM_USB_DCP, USB_PM); */
#endif
}
/*
Register entry point for the peripheral controller driver.
*/
int usb_gadget_register_driver(struct usb_gadget_driver *driver)
{
struct lh7a40x_udc *dev = the_controller;
int retval;
DEBUG("%s: %s\n", __func__, driver->driver.name);
if (!driver
|| driver->speed != USB_SPEED_FULL
|| !driver->bind
|| !driver->disconnect
|| !driver->setup)
return -EINVAL;
if (!dev)
return -ENODEV;
if (dev->driver)
return -EBUSY;
/* first hook up the driver ... */
dev->driver = driver;
dev->gadget.dev.driver = &driver->driver;
device_add(&dev->gadget.dev);
retval = driver->bind(&dev->gadget);
if (retval) {
printk(KERN_WARNING "%s: bind to driver %s --> error %d\n",
dev->gadget.name, driver->driver.name, retval);
device_del(&dev->gadget.dev);
dev->driver = 0;
dev->gadget.dev.driver = 0;
return retval;
}
/* ... then enable host detection and ep0; and we're ready
* for set_configuration as well as eventual disconnect.
* NOTE: this shouldn't power up until later.
*/
printk(KERN_WARNING "%s: registered gadget driver '%s'\n",
dev->gadget.name, driver->driver.name);
udc_enable(dev);
return 0;
}
EXPORT_SYMBOL(usb_gadget_register_driver);
/*
Unregister entry point for the peripheral controller driver.
*/
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
{
struct lh7a40x_udc *dev = the_controller;
unsigned long flags;
if (!dev)
return -ENODEV;
if (!driver || driver != dev->driver || !driver->unbind)
return -EINVAL;
spin_lock_irqsave(&dev->lock, flags);
dev->driver = 0;
stop_activity(dev, driver);
spin_unlock_irqrestore(&dev->lock, flags);
driver->unbind(&dev->gadget);
dev->gadget.dev.driver = NULL;
device_del(&dev->gadget.dev);
udc_disable(dev);
DEBUG("unregistered gadget driver '%s'\n", driver->driver.name);
return 0;
}
EXPORT_SYMBOL(usb_gadget_unregister_driver);
/*-------------------------------------------------------------------------*/
/** Write request to FIFO (max write == maxp size)
* Return: 0 = still running, 1 = completed, negative = errno
* NOTE: INDEX register must be set for EP
*/
static int write_fifo(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
{
u32 max;
u32 csr;
max = le16_to_cpu(ep->desc->wMaxPacketSize);
csr = usb_read(ep->csr1);
DEBUG("CSR: %x %d\n", csr, csr & USB_IN_CSR1_FIFO_NOT_EMPTY);
if (!(csr & USB_IN_CSR1_FIFO_NOT_EMPTY)) {
unsigned count;
int is_last, is_short;
count = write_packet(ep, req, max);
usb_set(USB_IN_CSR1_IN_PKT_RDY, ep->csr1);
/* last packet is usually short (or a zlp) */
if (unlikely(count != max))
is_last = is_short = 1;
else {
if (likely(req->req.length != req->req.actual)
|| req->req.zero)
is_last = 0;
else
is_last = 1;
/* interrupt/iso maxpacket may not fill the fifo */
is_short = unlikely(max < ep_maxpacket(ep));
}
DEBUG("%s: wrote %s %d bytes%s%s %d left %p\n", __func__,
ep->ep.name, count,
is_last ? "/L" : "", is_short ? "/S" : "",
req->req.length - req->req.actual, req);
/* requests complete when all IN data is in the FIFO */
if (is_last) {
done(ep, req, 0);
if (list_empty(&ep->queue)) {
pio_irq_disable(ep_index(ep));
}
return 1;
}
} else {
DEBUG("Hmm.. %d ep FIFO is not empty!\n", ep_index(ep));
}
return 0;
}
/** Read to request from FIFO (max read == bytes in fifo)
* Return: 0 = still running, 1 = completed, negative = errno
* NOTE: INDEX register must be set for EP
*/
static int read_fifo(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
{
u32 csr;
u8 *buf;
unsigned bufferspace, count, is_short;
volatile u32 *fifo = (volatile u32 *)ep->fifo;
/* make sure there's a packet in the FIFO. */
csr = usb_read(ep->csr1);
if (!(csr & USB_OUT_CSR1_OUT_PKT_RDY)) {
DEBUG("%s: Packet NOT ready!\n", __func__);
return -EINVAL;
}
buf = req->req.buf + req->req.actual;
prefetchw(buf);
bufferspace = req->req.length - req->req.actual;
/* read all bytes from this packet */
count = usb_read(USB_OUT_FIFO_WC1);
req->req.actual += min(count, bufferspace);
is_short = (count < ep->ep.maxpacket);
DEBUG("read %s %02x, %d bytes%s req %p %d/%d\n",
ep->ep.name, csr, count,
is_short ? "/S" : "", req, req->req.actual, req->req.length);
while (likely(count-- != 0)) {
u8 byte = (u8) (*fifo & 0xff);
if (unlikely(bufferspace == 0)) {
/* this happens when the driver's buffer
* is smaller than what the host sent.
* discard the extra data.
*/
if (req->req.status != -EOVERFLOW)
printk(KERN_WARNING "%s overflow %d\n",
ep->ep.name, count);
req->req.status = -EOVERFLOW;
} else {
*buf++ = byte;
bufferspace--;
}
}
usb_clear(USB_OUT_CSR1_OUT_PKT_RDY, ep->csr1);
/* completion */
if (is_short || req->req.actual == req->req.length) {
done(ep, req, 0);
usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1);
if (list_empty(&ep->queue))
pio_irq_disable(ep_index(ep));
return 1;
}
/* finished that packet. the next one may be waiting... */
return 0;
}
/*
* done - retire a request; caller blocked irqs
* INDEX register is preserved to keep same
*/
static void done(struct lh7a40x_ep *ep, struct lh7a40x_request *req, int status)
{
unsigned int stopped = ep->stopped;
u32 index;
DEBUG("%s, %p\n", __func__, ep);
list_del_init(&req->queue);
if (likely(req->req.status == -EINPROGRESS))
req->req.status = status;
else
status = req->req.status;
if (status && status != -ESHUTDOWN)
DEBUG("complete %s req %p stat %d len %u/%u\n",
ep->ep.name, &req->req, status,
req->req.actual, req->req.length);
/* don't modify queue heads during completion callback */
ep->stopped = 1;
/* Read current index (completion may modify it) */
index = usb_read(USB_INDEX);
spin_unlock(&ep->dev->lock);
req->req.complete(&ep->ep, &req->req);
spin_lock(&ep->dev->lock);
/* Restore index */
usb_set_index(index);
ep->stopped = stopped;
}
/** Enable EP interrupt */
static void pio_irq_enable(int ep)
{
DEBUG("%s: %d\n", __func__, ep);
switch (ep) {
case 1:
usb_set(USB_IN_INT_EP1, USB_IN_INT_EN);
break;
case 2:
usb_set(USB_OUT_INT_EP2, USB_OUT_INT_EN);
break;
case 3:
usb_set(USB_IN_INT_EP3, USB_IN_INT_EN);
break;
default:
DEBUG("Unknown endpoint: %d\n", ep);
break;
}
}
/** Disable EP interrupt */
static void pio_irq_disable(int ep)
{
DEBUG("%s: %d\n", __func__, ep);
switch (ep) {
case 1:
usb_clear(USB_IN_INT_EP1, USB_IN_INT_EN);
break;
case 2:
usb_clear(USB_OUT_INT_EP2, USB_OUT_INT_EN);
break;
case 3:
usb_clear(USB_IN_INT_EP3, USB_IN_INT_EN);
break;
default:
DEBUG("Unknown endpoint: %d\n", ep);
break;
}
}
/*
* nuke - dequeue ALL requests
*/
void nuke(struct lh7a40x_ep *ep, int status)
{
struct lh7a40x_request *req;
DEBUG("%s, %p\n", __func__, ep);
/* Flush FIFO */
flush(ep);
/* called with irqs blocked */
while (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
done(ep, req, status);
}
/* Disable IRQ if EP is enabled (has descriptor) */
if (ep->desc)
pio_irq_disable(ep_index(ep));
}
/*
void nuke_all(struct lh7a40x_udc *dev)
{
int n;
for(n=0; n<UDC_MAX_ENDPOINTS; n++) {
struct lh7a40x_ep *ep = &dev->ep[n];
usb_set_index(n);
nuke(ep, 0);
}
}*/
/*
static void flush_all(struct lh7a40x_udc *dev)
{
int n;
for (n = 0; n < UDC_MAX_ENDPOINTS; n++)
{
struct lh7a40x_ep *ep = &dev->ep[n];
flush(ep);
}
}
*/
/** Flush EP
* NOTE: INDEX register must be set before this call
*/
static void flush(struct lh7a40x_ep *ep)
{
DEBUG("%s, %p\n", __func__, ep);
switch (ep->ep_type) {
case ep_control:
/* check, by implication c.f. 15.1.2.11 */
break;
case ep_bulk_in:
case ep_interrupt:
/* if(csr & USB_IN_CSR1_IN_PKT_RDY) */
usb_set(USB_IN_CSR1_FIFO_FLUSH, ep->csr1);
break;
case ep_bulk_out:
/* if(csr & USB_OUT_CSR1_OUT_PKT_RDY) */
usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1);
break;
}
}
/**
* lh7a40x_in_epn - handle IN interrupt
*/
static void lh7a40x_in_epn(struct lh7a40x_udc *dev, u32 ep_idx, u32 intr)
{
u32 csr;
struct lh7a40x_ep *ep = &dev->ep[ep_idx];
struct lh7a40x_request *req;
usb_set_index(ep_idx);
csr = usb_read(ep->csr1);
DEBUG("%s: %d, csr %x\n", __func__, ep_idx, csr);
if (csr & USB_IN_CSR1_SENT_STALL) {
DEBUG("USB_IN_CSR1_SENT_STALL\n");
usb_set(USB_IN_CSR1_SENT_STALL /*|USB_IN_CSR1_SEND_STALL */ ,
ep->csr1);
return;
}
if (!ep->desc) {
DEBUG("%s: NO EP DESC\n", __func__);
return;
}
if (list_empty(&ep->queue))
req = 0;
else
req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
DEBUG("req: %p\n", req);
if (!req)
return;
write_fifo(ep, req);
}
/* ********************************************************************************************* */
/* Bulk OUT (recv)
*/
static void lh7a40x_out_epn(struct lh7a40x_udc *dev, u32 ep_idx, u32 intr)
{
struct lh7a40x_ep *ep = &dev->ep[ep_idx];
struct lh7a40x_request *req;
DEBUG("%s: %d\n", __func__, ep_idx);
usb_set_index(ep_idx);
if (ep->desc) {
u32 csr;
csr = usb_read(ep->csr1);
while ((csr =
usb_read(ep->
csr1)) & (USB_OUT_CSR1_OUT_PKT_RDY |
USB_OUT_CSR1_SENT_STALL)) {
DEBUG("%s: %x\n", __func__, csr);
if (csr & USB_OUT_CSR1_SENT_STALL) {
DEBUG("%s: stall sent, flush fifo\n",
__func__);
/* usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1); */
flush(ep);
} else if (csr & USB_OUT_CSR1_OUT_PKT_RDY) {
if (list_empty(&ep->queue))
req = 0;
else
req =
list_entry(ep->queue.next,
struct lh7a40x_request,
queue);
if (!req) {
printk(KERN_WARNING
"%s: NULL REQ %d\n",
__func__, ep_idx);
flush(ep);
break;
} else {
read_fifo(ep, req);
}
}
}
} else {
/* Throw packet away.. */
printk(KERN_WARNING "%s: No descriptor?!?\n", __func__);
flush(ep);
}
}
static void stop_activity(struct lh7a40x_udc *dev,
struct usb_gadget_driver *driver)
{
int i;
/* don't disconnect drivers more than once */
if (dev->gadget.speed == USB_SPEED_UNKNOWN)
driver = 0;
dev->gadget.speed = USB_SPEED_UNKNOWN;
/* prevent new request submissions, kill any outstanding requests */
for (i = 0; i < UDC_MAX_ENDPOINTS; i++) {
struct lh7a40x_ep *ep = &dev->ep[i];
ep->stopped = 1;
usb_set_index(i);
nuke(ep, -ESHUTDOWN);
}
/* report disconnect; the driver is already quiesced */
if (driver) {
spin_unlock(&dev->lock);
driver->disconnect(&dev->gadget);
spin_lock(&dev->lock);
}
/* re-init driver-visible data structures */
udc_reinit(dev);
}
/** Handle USB RESET interrupt
*/
static void lh7a40x_reset_intr(struct lh7a40x_udc *dev)
{
#if 0 /* def CONFIG_ARCH_LH7A404 */
/* Does not work always... */
DEBUG("%s: %d\n", __func__, dev->usb_address);
if (!dev->usb_address) {
/*usb_set(USB_RESET_IO, USB_RESET);
mdelay(5);
usb_clear(USB_RESET_IO, USB_RESET); */
return;
}
/* Put the USB controller into reset. */
usb_set(USB_RESET_IO, USB_RESET);
/* Set Device ID to 0 */
udc_set_address(dev, 0);
/* Let PLL2 settle down */
mdelay(5);
/* Release the USB controller from reset */
usb_clear(USB_RESET_IO, USB_RESET);
/* Re-enable UDC */
udc_enable(dev);
#endif
dev->gadget.speed = USB_SPEED_FULL;
}
/*
* lh7a40x usb client interrupt handler.
*/
static irqreturn_t lh7a40x_udc_irq(int irq, void *_dev)
{
struct lh7a40x_udc *dev = _dev;
DEBUG("\n\n");
spin_lock(&dev->lock);
for (;;) {
u32 intr_in = usb_read(USB_IN_INT);
u32 intr_out = usb_read(USB_OUT_INT);
u32 intr_int = usb_read(USB_INT);
/* Test also against enable bits.. (lh7a40x errata).. Sigh.. */
u32 in_en = usb_read(USB_IN_INT_EN);
u32 out_en = usb_read(USB_OUT_INT_EN);
if (!intr_out && !intr_in && !intr_int)
break;
DEBUG("%s (on state %s)\n", __func__,
state_names[dev->ep0state]);
DEBUG("intr_out = %x\n", intr_out);
DEBUG("intr_in = %x\n", intr_in);
DEBUG("intr_int = %x\n", intr_int);
if (intr_in) {
usb_write(intr_in, USB_IN_INT);
if ((intr_in & USB_IN_INT_EP1)
&& (in_en & USB_IN_INT_EP1)) {
DEBUG("USB_IN_INT_EP1\n");
lh7a40x_in_epn(dev, 1, intr_in);
}
if ((intr_in & USB_IN_INT_EP3)
&& (in_en & USB_IN_INT_EP3)) {
DEBUG("USB_IN_INT_EP3\n");
lh7a40x_in_epn(dev, 3, intr_in);
}
if (intr_in & USB_IN_INT_EP0) {
DEBUG("USB_IN_INT_EP0 (control)\n");
lh7a40x_handle_ep0(dev, intr_in);
}
}
if (intr_out) {
usb_write(intr_out, USB_OUT_INT);
if ((intr_out & USB_OUT_INT_EP2)
&& (out_en & USB_OUT_INT_EP2)) {
DEBUG("USB_OUT_INT_EP2\n");
lh7a40x_out_epn(dev, 2, intr_out);
}
}
if (intr_int) {
usb_write(intr_int, USB_INT);
if (intr_int & USB_INT_RESET_INT) {
lh7a40x_reset_intr(dev);
}
if (intr_int & USB_INT_RESUME_INT) {
DEBUG("USB resume\n");
if (dev->gadget.speed != USB_SPEED_UNKNOWN
&& dev->driver
&& dev->driver->resume
&& is_usb_connected()) {
dev->driver->resume(&dev->gadget);
}
}
if (intr_int & USB_INT_SUSPEND_INT) {
DEBUG("USB suspend%s\n",
is_usb_connected()? "" : "+disconnect");
if (!is_usb_connected()) {
stop_activity(dev, dev->driver);
} else if (dev->gadget.speed !=