u-boot/drivers/usb/gadget/pxa25x_udc.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

2046 lines
50 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Intel PXA25x and IXP4xx on-chip full speed USB device controllers
*
* Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker)
* Copyright (C) 2003 Robert Schwebel, Pengutronix
* Copyright (C) 2003 Benedikt Spranger, Pengutronix
* Copyright (C) 2003 David Brownell
* Copyright (C) 2003 Joshua Wise
* Copyright (C) 2012 Lukasz Dalek <luk0104@gmail.com>
*
* MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell");
*/
#define CONFIG_USB_PXA25X_SMALL
#define DRIVER_NAME "pxa25x_udc_linux"
#define ARCH_HAS_PREFETCH
#include <common.h>
#include <errno.h>
#include <asm/byteorder.h>
#include <asm/system.h>
#include <asm/mach-types.h>
#include <asm/unaligned.h>
#include <linux/compat.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/arch/pxa.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <usb/lin_gadget_compat.h>
#include <asm/arch/pxa-regs.h>
#include "pxa25x_udc.h"
/*
* This driver handles the USB Device Controller (UDC) in Intel's PXA 25x
* series processors. The UDC for the IXP 4xx series is very similar.
* There are fifteen endpoints, in addition to ep0.
*
* Such controller drivers work with a gadget driver. The gadget driver
* returns descriptors, implements configuration and data protocols used
* by the host to interact with this device, and allocates endpoints to
* the different protocol interfaces. The controller driver virtualizes
* usb hardware so that the gadget drivers will be more portable.
*
* This UDC hardware wants to implement a bit too much USB protocol, so
* it constrains the sorts of USB configuration change events that work.
* The errata for these chips are misleading; some "fixed" bugs from
* pxa250 a0/a1 b0/b1/b2 sure act like they're still there.
*
* Note that the UDC hardware supports DMA (except on IXP) but that's
* not used here. IN-DMA (to host) is simple enough, when the data is
* suitably aligned (16 bytes) ... the network stack doesn't do that,
* other software can. OUT-DMA is buggy in most chip versions, as well
* as poorly designed (data toggle not automatic). So this driver won't
* bother using DMA. (Mostly-working IN-DMA support was available in
* kernels before 2.6.23, but was never enabled or well tested.)
*/
#define DRIVER_VERSION "18-August-2012"
#define DRIVER_DESC "PXA 25x USB Device Controller driver"
static const char driver_name[] = "pxa25x_udc";
static const char ep0name[] = "ep0";
/* Watchdog */
static inline void start_watchdog(struct pxa25x_udc *udc)
{
debug("Started watchdog\n");
udc->watchdog.base = get_timer(0);
udc->watchdog.running = 1;
}
static inline void stop_watchdog(struct pxa25x_udc *udc)
{
udc->watchdog.running = 0;
debug("Stopped watchdog\n");
}
static inline void test_watchdog(struct pxa25x_udc *udc)
{
if (!udc->watchdog.running)
return;
debug("watchdog %ld %ld\n", get_timer(udc->watchdog.base),
udc->watchdog.period);
if (get_timer(udc->watchdog.base) >= udc->watchdog.period) {
stop_watchdog(udc);
udc->watchdog.function(udc);
}
}
static void udc_watchdog(struct pxa25x_udc *dev)
{
uint32_t udccs0 = readl(&dev->regs->udccs[0]);
debug("Fired up udc_watchdog\n");
local_irq_disable();
if (dev->ep0state == EP0_STALL
&& (udccs0 & UDCCS0_FST) == 0
&& (udccs0 & UDCCS0_SST) == 0) {
writel(UDCCS0_FST|UDCCS0_FTF, &dev->regs->udccs[0]);
debug("ep0 re-stall\n");
start_watchdog(dev);
}
local_irq_enable();
}
#ifdef DEBUG
static const char * const state_name[] = {
"EP0_IDLE",
"EP0_IN_DATA_PHASE", "EP0_OUT_DATA_PHASE",
"EP0_END_XFER", "EP0_STALL"
};
static void
dump_udccr(const char *label)
{
u32 udccr = readl(&UDC_REGS->udccr);
debug("%s %02X =%s%s%s%s%s%s%s%s\n",
label, udccr,
(udccr & UDCCR_REM) ? " rem" : "",
(udccr & UDCCR_RSTIR) ? " rstir" : "",
(udccr & UDCCR_SRM) ? " srm" : "",
(udccr & UDCCR_SUSIR) ? " susir" : "",
(udccr & UDCCR_RESIR) ? " resir" : "",
(udccr & UDCCR_RSM) ? " rsm" : "",
(udccr & UDCCR_UDA) ? " uda" : "",
(udccr & UDCCR_UDE) ? " ude" : "");
}
static void
dump_udccs0(const char *label)
{
u32 udccs0 = readl(&UDC_REGS->udccs[0]);
debug("%s %s %02X =%s%s%s%s%s%s%s%s\n",
label, state_name[the_controller->ep0state], udccs0,
(udccs0 & UDCCS0_SA) ? " sa" : "",
(udccs0 & UDCCS0_RNE) ? " rne" : "",
(udccs0 & UDCCS0_FST) ? " fst" : "",
(udccs0 & UDCCS0_SST) ? " sst" : "",
(udccs0 & UDCCS0_DRWF) ? " dwrf" : "",
(udccs0 & UDCCS0_FTF) ? " ftf" : "",
(udccs0 & UDCCS0_IPR) ? " ipr" : "",
(udccs0 & UDCCS0_OPR) ? " opr" : "");
}
static void
dump_state(struct pxa25x_udc *dev)
{
u32 tmp;
unsigned i;
debug("%s, uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
state_name[dev->ep0state],
readl(&UDC_REGS->uicr1), readl(&UDC_REGS->uicr0),
readl(&UDC_REGS->usir1), readl(&UDC_REGS->usir0),
readl(&UDC_REGS->ufnrh), readl(&UDC_REGS->ufnrl));
dump_udccr("udccr");
if (dev->has_cfr) {
tmp = readl(&UDC_REGS->udccfr);
debug("udccfr %02X =%s%s\n", tmp,
(tmp & UDCCFR_AREN) ? " aren" : "",
(tmp & UDCCFR_ACM) ? " acm" : "");
}
if (!dev->driver) {
debug("no gadget driver bound\n");
return;
} else
debug("ep0 driver '%s'\n", "ether");
dump_udccs0("udccs0");
debug("ep0 IN %lu/%lu, OUT %lu/%lu\n",
dev->stats.write.bytes, dev->stats.write.ops,
dev->stats.read.bytes, dev->stats.read.ops);
for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++) {
if (dev->ep[i].desc == NULL)
continue;
debug("udccs%d = %02x\n", i, *dev->ep->reg_udccs);
}
}
#else /* DEBUG */
static inline void dump_udccr(const char *label) { }
static inline void dump_udccs0(const char *label) { }
static inline void dump_state(struct pxa25x_udc *dev) { }
#endif /* DEBUG */
/*
* ---------------------------------------------------------------------------
* endpoint related parts of the api to the usb controller hardware,
* used by gadget driver; and the inner talker-to-hardware core.
* ---------------------------------------------------------------------------
*/
static void pxa25x_ep_fifo_flush(struct usb_ep *ep);
static void nuke(struct pxa25x_ep *, int status);
/* one GPIO should control a D+ pullup, so host sees this device (or not) */
static void pullup_off(void)
{
struct pxa2xx_udc_mach_info *mach = the_controller->mach;
if (mach->udc_command)
mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
}
static void pullup_on(void)
{
struct pxa2xx_udc_mach_info *mach = the_controller->mach;
if (mach->udc_command)
mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
}
static void pio_irq_enable(int bEndpointAddress)
{
bEndpointAddress &= 0xf;
if (bEndpointAddress < 8) {
clrbits_le32(&the_controller->regs->uicr0,
1 << bEndpointAddress);
} else {
bEndpointAddress -= 8;
clrbits_le32(&the_controller->regs->uicr1,
1 << bEndpointAddress);
}
}
static void pio_irq_disable(int bEndpointAddress)
{
bEndpointAddress &= 0xf;
if (bEndpointAddress < 8) {
setbits_le32(&the_controller->regs->uicr0,
1 << bEndpointAddress);
} else {
bEndpointAddress -= 8;
setbits_le32(&the_controller->regs->uicr1,
1 << bEndpointAddress);
}
}
static inline void udc_set_mask_UDCCR(int mask)
{
/*
* The UDCCR reg contains mask and interrupt status bits,
* so using '|=' isn't safe as it may ack an interrupt.
*/
const uint32_t mask_bits = UDCCR_REM | UDCCR_SRM | UDCCR_UDE;
mask &= mask_bits;
clrsetbits_le32(&the_controller->regs->udccr, ~mask_bits, mask);
}
static inline void udc_clear_mask_UDCCR(int mask)
{
const uint32_t mask_bits = UDCCR_REM | UDCCR_SRM | UDCCR_UDE;
mask = ~mask & mask_bits;
clrbits_le32(&the_controller->regs->udccr, ~mask);
}
static inline void udc_ack_int_UDCCR(int mask)
{
const uint32_t mask_bits = UDCCR_REM | UDCCR_SRM | UDCCR_UDE;
mask &= ~mask_bits;
clrsetbits_le32(&the_controller->regs->udccr, ~mask_bits, mask);
}
/*
* endpoint enable/disable
*
* we need to verify the descriptors used to enable endpoints. since pxa25x
* endpoint configurations are fixed, and are pretty much always enabled,
* there's not a lot to manage here.
*
* because pxa25x can't selectively initialize bulk (or interrupt) endpoints,
* (resetting endpoint halt and toggle), SET_INTERFACE is unusable except
* for a single interface (with only the default altsetting) and for gadget
* drivers that don't halt endpoints (not reset by set_interface). that also
* means that if you use ISO, you must violate the USB spec rule that all
* iso endpoints must be in non-default altsettings.
*/
static int pxa25x_ep_enable(struct usb_ep *_ep,
const struct usb_endpoint_descriptor *desc)
{
struct pxa25x_ep *ep;
struct pxa25x_udc *dev;
ep = container_of(_ep, struct pxa25x_ep, ep);
if (!_ep || !desc || ep->desc || _ep->name == ep0name
|| desc->bDescriptorType != USB_DT_ENDPOINT
|| ep->bEndpointAddress != desc->bEndpointAddress
|| ep->fifo_size <
le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {
printf("%s, bad ep or descriptor\n", __func__);
return -EINVAL;
}
/* xfer types must match, except that interrupt ~= bulk */
if (ep->bmAttributes != desc->bmAttributes
&& ep->bmAttributes != USB_ENDPOINT_XFER_BULK
&& desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
printf("%s, %s type mismatch\n", __func__, _ep->name);
return -EINVAL;
}
/* hardware _could_ do smaller, but driver doesn't */
if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
&& le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))
!= BULK_FIFO_SIZE)
|| !get_unaligned(&desc->wMaxPacketSize)) {
printf("%s, bad %s maxpacket\n", __func__, _ep->name);
return -ERANGE;
}
dev = ep->dev;
if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
printf("%s, bogus device state\n", __func__);
return -ESHUTDOWN;
}
ep->desc = desc;
ep->stopped = 0;
ep->pio_irqs = 0;
ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
/* flush fifo (mostly for OUT buffers) */
pxa25x_ep_fifo_flush(_ep);
/* ... reset halt state too, if we could ... */
debug("enabled %s\n", _ep->name);
return 0;
}
static int pxa25x_ep_disable(struct usb_ep *_ep)
{
struct pxa25x_ep *ep;
unsigned long flags;
ep = container_of(_ep, struct pxa25x_ep, ep);
if (!_ep || !ep->desc) {
printf("%s, %s not enabled\n", __func__,
_ep ? ep->ep.name : NULL);
return -EINVAL;
}
local_irq_save(flags);
nuke(ep, -ESHUTDOWN);
/* flush fifo (mostly for IN buffers) */
pxa25x_ep_fifo_flush(_ep);
ep->desc = NULL;
ep->stopped = 1;
local_irq_restore(flags);
debug("%s disabled\n", _ep->name);
return 0;
}
/*-------------------------------------------------------------------------*/
/*
* for the pxa25x, these can just wrap kmalloc/kfree. gadget drivers
* must still pass correctly initialized endpoints, since other controller
* drivers may care about how it's currently set up (dma issues etc).
*/
/*
* pxa25x_ep_alloc_request - allocate a request data structure
*/
static struct usb_request *
pxa25x_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
{
struct pxa25x_request *req;
req = kzalloc(sizeof(*req), gfp_flags);
if (!req)
return NULL;
INIT_LIST_HEAD(&req->queue);
return &req->req;
}
/*
* pxa25x_ep_free_request - deallocate a request data structure
*/
static void
pxa25x_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
{
struct pxa25x_request *req;
req = container_of(_req, struct pxa25x_request, req);
WARN_ON(!list_empty(&req->queue));
kfree(req);
}
/*-------------------------------------------------------------------------*/
/*
* done - retire a request; caller blocked irqs
*/
static void done(struct pxa25x_ep *ep, struct pxa25x_request *req, int status)
{
unsigned stopped = ep->stopped;
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;
req->req.complete(&ep->ep, &req->req);
ep->stopped = stopped;
}
static inline void ep0_idle(struct pxa25x_udc *dev)
{
dev->ep0state = EP0_IDLE;
}
static int
write_packet(u32 *uddr, struct pxa25x_request *req, unsigned max)
{
u8 *buf;
unsigned length, count;
debug("%s(): uddr %p\n", __func__, uddr);
buf = req->req.buf + req->req.actual;
prefetch(buf);
/* how big will this packet be? */
length = min(req->req.length - req->req.actual, max);
req->req.actual += length;
count = length;
while (likely(count--))
writeb(*buf++, uddr);
return length;
}
/*
* write to an IN endpoint fifo, as many packets as possible.
* irqs will use this to write the rest later.
* caller guarantees at least one packet buffer is ready (or a zlp).
*/
static int
write_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req)
{
unsigned max;
max = le16_to_cpu(get_unaligned(&ep->desc->wMaxPacketSize));
do {
unsigned count;
int is_last, is_short;
count = write_packet(ep->reg_uddr, req, max);
/* 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->fifo_size);
}
debug_cond(NOISY, "wrote %s %d bytes%s%s %d left %p\n",
ep->ep.name, count,
is_last ? "/L" : "", is_short ? "/S" : "",
req->req.length - req->req.actual, req);
/*
* let loose that packet. maybe try writing another one,
* double buffering might work. TSP, TPC, and TFS
* bit values are the same for all normal IN endpoints.
*/
writel(UDCCS_BI_TPC, ep->reg_udccs);
if (is_short)
writel(UDCCS_BI_TSP, ep->reg_udccs);
/* 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->bEndpointAddress);
return 1;
}
/*
* TODO experiment: how robust can fifo mode tweaking be?
* double buffering is off in the default fifo mode, which
* prevents TFS from being set here.
*/
} while (readl(ep->reg_udccs) & UDCCS_BI_TFS);
return 0;
}
/*
* caller asserts req->pending (ep0 irq status nyet cleared); starts
* ep0 data stage. these chips want very simple state transitions.
*/
static inline
void ep0start(struct pxa25x_udc *dev, u32 flags, const char *tag)
{
writel(flags|UDCCS0_SA|UDCCS0_OPR, &dev->regs->udccs[0]);
writel(USIR0_IR0, &dev->regs->usir0);
dev->req_pending = 0;
debug_cond(NOISY, "%s() %s, udccs0: %02x/%02x usir: %X.%X\n",
__func__, tag, readl(&dev->regs->udccs[0]), flags,
readl(&dev->regs->usir1), readl(&dev->regs->usir0));
}
static int
write_ep0_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req)
{
unsigned count;
int is_short;
count = write_packet(&ep->dev->regs->uddr0, req, EP0_FIFO_SIZE);
ep->dev->stats.write.bytes += count;
/* last packet "must be" short (or a zlp) */
is_short = (count != EP0_FIFO_SIZE);
debug_cond(NOISY, "ep0in %d bytes %d left %p\n", count,
req->req.length - req->req.actual, req);
if (unlikely(is_short)) {
if (ep->dev->req_pending)
ep0start(ep->dev, UDCCS0_IPR, "short IN");
else
writel(UDCCS0_IPR, &ep->dev->regs->udccs[0]);
count = req->req.length;
done(ep, req, 0);
ep0_idle(ep->dev);
/*
* This seems to get rid of lost status irqs in some cases:
* host responds quickly, or next request involves config
* change automagic, or should have been hidden, or ...
*
* FIXME get rid of all udelays possible...
*/
if (count >= EP0_FIFO_SIZE) {
count = 100;
do {
if ((readl(&ep->dev->regs->udccs[0]) &
UDCCS0_OPR) != 0) {
/* clear OPR, generate ack */
writel(UDCCS0_OPR,
&ep->dev->regs->udccs[0]);
break;
}
count--;
udelay(1);
} while (count);
}
} else if (ep->dev->req_pending)
ep0start(ep->dev, 0, "IN");
return is_short;
}
/*
* read_fifo - unload packet(s) from the fifo we use for usb OUT
* transfers and put them into the request. caller should have made
* sure there's at least one packet ready.
*
* returns true if the request completed because of short packet or the
* request buffer having filled (and maybe overran till end-of-packet).
*/
static int
read_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req)
{
u32 udccs;
u8 *buf;
unsigned bufferspace, count, is_short;
for (;;) {
/*
* make sure there's a packet in the FIFO.
* UDCCS_{BO,IO}_RPC are all the same bit value.
* UDCCS_{BO,IO}_RNE are all the same bit value.
*/
udccs = readl(ep->reg_udccs);
if (unlikely((udccs & UDCCS_BO_RPC) == 0))
break;
buf = req->req.buf + req->req.actual;
prefetchw(buf);
bufferspace = req->req.length - req->req.actual;
/* read all bytes from this packet */
if (likely(udccs & UDCCS_BO_RNE)) {
count = 1 + (0x0ff & readl(ep->reg_ubcr));
req->req.actual += min(count, bufferspace);
} else /* zlp */
count = 0;
is_short = (count < ep->ep.maxpacket);
debug_cond(NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n",
ep->ep.name, udccs, count,
is_short ? "/S" : "",
req, req->req.actual, req->req.length);
while (likely(count-- != 0)) {
u8 byte = readb(ep->reg_uddr);
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)
printf("%s overflow %d\n",
ep->ep.name, count);
req->req.status = -EOVERFLOW;
} else {
*buf++ = byte;
bufferspace--;
}
}
writel(UDCCS_BO_RPC, ep->reg_udccs);
/* RPC/RSP/RNE could now reflect the other packet buffer */
/* iso is one request per packet */
if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
if (udccs & UDCCS_IO_ROF)
req->req.status = -EHOSTUNREACH;
/* more like "is_done" */
is_short = 1;
}
/* completion */
if (is_short || req->req.actual == req->req.length) {
done(ep, req, 0);
if (list_empty(&ep->queue))
pio_irq_disable(ep->bEndpointAddress);
return 1;
}
/* finished that packet. the next one may be waiting... */
}
return 0;
}
/*
* special ep0 version of the above. no UBCR0 or double buffering; status
* handshaking is magic. most device protocols don't need control-OUT.
* CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other
* protocols do use them.
*/
static int
read_ep0_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req)
{
u8 *buf, byte;
unsigned bufferspace;
buf = req->req.buf + req->req.actual;
bufferspace = req->req.length - req->req.actual;
while (readl(&ep->dev->regs->udccs[0]) & UDCCS0_RNE) {
byte = (u8)readb(&ep->dev->regs->uddr0);
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)
printf("%s overflow\n", ep->ep.name);
req->req.status = -EOVERFLOW;
} else {
*buf++ = byte;
req->req.actual++;
bufferspace--;
}
}
writel(UDCCS0_OPR | UDCCS0_IPR, &ep->dev->regs->udccs[0]);
/* completion */
if (req->req.actual >= req->req.length)
return 1;
/* finished that packet. the next one may be waiting... */
return 0;
}
/*-------------------------------------------------------------------------*/
static int
pxa25x_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
{
struct pxa25x_request *req;
struct pxa25x_ep *ep;
struct pxa25x_udc *dev;
unsigned long flags;
req = container_of(_req, struct pxa25x_request, req);
if (unlikely(!_req || !_req->complete || !_req->buf
|| !list_empty(&req->queue))) {
printf("%s, bad params\n", __func__);
return -EINVAL;
}
ep = container_of(_ep, struct pxa25x_ep, ep);
if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
printf("%s, bad ep\n", __func__);
return -EINVAL;
}
dev = ep->dev;
if (unlikely(!dev->driver
|| dev->gadget.speed == USB_SPEED_UNKNOWN)) {
printf("%s, bogus device state\n", __func__);
return -ESHUTDOWN;
}
/*
* iso is always one packet per request, that's the only way
* we can report per-packet status. that also helps with dma.
*/
if (unlikely(ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
&& req->req.length >
le16_to_cpu(get_unaligned(&ep->desc->wMaxPacketSize))))
return -EMSGSIZE;
debug_cond(NOISY, "%s queue req %p, len %d buf %p\n",
_ep->name, _req, _req->length, _req->buf);
local_irq_save(flags);
_req->status = -EINPROGRESS;
_req->actual = 0;
/* kickstart this i/o queue? */
if (list_empty(&ep->queue) && !ep->stopped) {
if (ep->desc == NULL/* ep0 */) {
unsigned length = _req->length;
switch (dev->ep0state) {
case EP0_IN_DATA_PHASE:
dev->stats.write.ops++;
if (write_ep0_fifo(ep, req))
req = NULL;
break;
case EP0_OUT_DATA_PHASE:
dev->stats.read.ops++;
/* messy ... */
if (dev->req_config) {
debug("ep0 config ack%s\n",
dev->has_cfr ? "" : " raced");
if (dev->has_cfr)
writel(UDCCFR_AREN|UDCCFR_ACM
|UDCCFR_MB1,
&ep->dev->regs->udccfr);
done(ep, req, 0);
dev->ep0state = EP0_END_XFER;
local_irq_restore(flags);
return 0;
}
if (dev->req_pending)
ep0start(dev, UDCCS0_IPR, "OUT");
if (length == 0 ||
((readl(
&ep->dev->regs->udccs[0])
& UDCCS0_RNE) != 0
&& read_ep0_fifo(ep, req))) {
ep0_idle(dev);
done(ep, req, 0);
req = NULL;
}
break;
default:
printf("ep0 i/o, odd state %d\n",
dev->ep0state);
local_irq_restore(flags);
return -EL2HLT;
}
/* can the FIFO can satisfy the request immediately? */
} else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
if ((readl(ep->reg_udccs) & UDCCS_BI_TFS) != 0
&& write_fifo(ep, req))
req = NULL;
} else if ((readl(ep->reg_udccs) & UDCCS_BO_RFS) != 0
&& read_fifo(ep, req)) {
req = NULL;
}
if (likely(req && ep->desc))
pio_irq_enable(ep->bEndpointAddress);
}
/* pio or dma irq handler advances the queue. */
if (likely(req != NULL))
list_add_tail(&req->queue, &ep->queue);
local_irq_restore(flags);
return 0;
}
/*
* nuke - dequeue ALL requests
*/
static void nuke(struct pxa25x_ep *ep, int status)
{
struct pxa25x_request *req;
/* called with irqs blocked */
while (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next,
struct pxa25x_request,
queue);
done(ep, req, status);
}
if (ep->desc)
pio_irq_disable(ep->bEndpointAddress);
}
/* dequeue JUST ONE request */
static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
struct pxa25x_ep *ep;
struct pxa25x_request *req;
unsigned long flags;
ep = container_of(_ep, struct pxa25x_ep, ep);
if (!_ep || ep->ep.name == ep0name)
return -EINVAL;
local_irq_save(flags);
/* make sure it's actually queued on this endpoint */
list_for_each_entry(req, &ep->queue, queue) {
if (&req->req == _req)
break;
}
if (&req->req != _req) {
local_irq_restore(flags);
return -EINVAL;
}
done(ep, req, -ECONNRESET);
local_irq_restore(flags);
return 0;
}
/*-------------------------------------------------------------------------*/
static int pxa25x_ep_set_halt(struct usb_ep *_ep, int value)
{
struct pxa25x_ep *ep;
unsigned long flags;
ep = container_of(_ep, struct pxa25x_ep, ep);
if (unlikely(!_ep
|| (!ep->desc && ep->ep.name != ep0name))
|| ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
printf("%s, bad ep\n", __func__);
return -EINVAL;
}
if (value == 0) {
/*
* this path (reset toggle+halt) is needed to implement
* SET_INTERFACE on normal hardware. but it can't be
* done from software on the PXA UDC, and the hardware
* forgets to do it as part of SET_INTERFACE automagic.
*/
printf("only host can clear %s halt\n", _ep->name);
return -EROFS;
}
local_irq_save(flags);
if ((ep->bEndpointAddress & USB_DIR_IN) != 0
&& ((readl(ep->reg_udccs) & UDCCS_BI_TFS) == 0
|| !list_empty(&ep->queue))) {
local_irq_restore(flags);
return -EAGAIN;
}
/* FST bit is the same for control, bulk in, bulk out, interrupt in */
writel(UDCCS_BI_FST|UDCCS_BI_FTF, ep->reg_udccs);
/* ep0 needs special care */
if (!ep->desc) {
start_watchdog(ep->dev);
ep->dev->req_pending = 0;
ep->dev->ep0state = EP0_STALL;
/* and bulk/intr endpoints like dropping stalls too */
} else {
unsigned i;
for (i = 0; i < 1000; i += 20) {
if (readl(ep->reg_udccs) & UDCCS_BI_SST)
break;
udelay(20);
}
}
local_irq_restore(flags);
debug("%s halt\n", _ep->name);
return 0;
}
static int pxa25x_ep_fifo_status(struct usb_ep *_ep)
{
struct pxa25x_ep *ep;
ep = container_of(_ep, struct pxa25x_ep, ep);
if (!_ep) {
printf("%s, bad ep\n", __func__);
return -ENODEV;
}
/* pxa can't report unclaimed bytes from IN fifos */
if ((ep->bEndpointAddress & USB_DIR_IN) != 0)
return -EOPNOTSUPP;
if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN
|| (readl(ep->reg_udccs) & UDCCS_BO_RFS) == 0)
return 0;
else
return (readl(ep->reg_ubcr) & 0xfff) + 1;
}
static void pxa25x_ep_fifo_flush(struct usb_ep *_ep)
{
struct pxa25x_ep *ep;
ep = container_of(_ep, struct pxa25x_ep, ep);
if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) {
printf("%s, bad ep\n", __func__);
return;
}
/* toggle and halt bits stay unchanged */
/* for OUT, just read and discard the FIFO contents. */
if ((ep->bEndpointAddress & USB_DIR_IN) == 0) {
while (((readl(ep->reg_udccs)) & UDCCS_BO_RNE) != 0)
(void)readb(ep->reg_uddr);
return;
}
/* most IN status is the same, but ISO can't stall */
writel(UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
| (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
? 0 : UDCCS_BI_SST), ep->reg_udccs);
}
static struct usb_ep_ops pxa25x_ep_ops = {
.enable = pxa25x_ep_enable,
.disable = pxa25x_ep_disable,
.alloc_request = pxa25x_ep_alloc_request,
.free_request = pxa25x_ep_free_request,
.queue = pxa25x_ep_queue,
.dequeue = pxa25x_ep_dequeue,
.set_halt = pxa25x_ep_set_halt,
.fifo_status = pxa25x_ep_fifo_status,
.fifo_flush = pxa25x_ep_fifo_flush,
};
/* ---------------------------------------------------------------------------
* device-scoped parts of the api to the usb controller hardware
* ---------------------------------------------------------------------------
*/
static int pxa25x_udc_get_frame(struct usb_gadget *_gadget)
{
return ((readl(&the_controller->regs->ufnrh) & 0x07) << 8) |
(readl(&the_controller->regs->ufnrl) & 0xff);
}
static int pxa25x_udc_wakeup(struct usb_gadget *_gadget)
{
/* host may not have enabled remote wakeup */
if ((readl(&the_controller->regs->udccs[0]) & UDCCS0_DRWF) == 0)
return -EHOSTUNREACH;
udc_set_mask_UDCCR(UDCCR_RSM);
return 0;
}
static void stop_activity(struct pxa25x_udc *, struct usb_gadget_driver *);
static void udc_enable(struct pxa25x_udc *);
static void udc_disable(struct pxa25x_udc *);
/*
* We disable the UDC -- and its 48 MHz clock -- whenever it's not
* in active use.
*/
static int pullup(struct pxa25x_udc *udc)
{
if (udc->pullup)
pullup_on();
else
pullup_off();
int is_active = udc->pullup;
if (is_active) {
if (!udc->active) {
udc->active = 1;
udc_enable(udc);
}
} else {
if (udc->active) {
if (udc->gadget.speed != USB_SPEED_UNKNOWN)
stop_activity(udc, udc->driver);
udc_disable(udc);
udc->active = 0;
}
}
return 0;
}
/* VBUS reporting logically comes from a transceiver */
static int pxa25x_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
{
struct pxa25x_udc *udc;
udc = container_of(_gadget, struct pxa25x_udc, gadget);
printf("vbus %s\n", is_active ? "supplied" : "inactive");
pullup(udc);
return 0;
}
/* drivers may have software control over D+ pullup */
static int pxa25x_udc_pullup(struct usb_gadget *_gadget, int is_active)
{
struct pxa25x_udc *udc;
udc = container_of(_gadget, struct pxa25x_udc, gadget);
/* not all boards support pullup control */
if (!udc->mach->udc_command)
return -EOPNOTSUPP;
udc->pullup = (is_active != 0);
pullup(udc);
return 0;
}
/*
* boards may consume current from VBUS, up to 100-500mA based on config.
* the 500uA suspend ceiling means that exclusively vbus-powered PXA designs
* violate USB specs.
*/
static int pxa25x_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
{
return -EOPNOTSUPP;
}
static const struct usb_gadget_ops pxa25x_udc_ops = {
.get_frame = pxa25x_udc_get_frame,
.wakeup = pxa25x_udc_wakeup,
.vbus_session = pxa25x_udc_vbus_session,
.pullup = pxa25x_udc_pullup,
.vbus_draw = pxa25x_udc_vbus_draw,
};
/*-------------------------------------------------------------------------*/
/*
* udc_disable - disable USB device controller
*/
static void udc_disable(struct pxa25x_udc *dev)
{
/* block all irqs */
udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM);
writel(0xff, &dev->regs->uicr0);
writel(0xff, &dev->regs->uicr1);
writel(UFNRH_SIM, &dev->regs->ufnrh);
/* if hardware supports it, disconnect from usb */
pullup_off();
udc_clear_mask_UDCCR(UDCCR_UDE);
ep0_idle(dev);
dev->gadget.speed = USB_SPEED_UNKNOWN;
}
/*
* udc_reinit - initialize software state
*/
static void udc_reinit(struct pxa25x_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;
/* basic endpoint records init */
for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
struct pxa25x_ep *ep = &dev->ep[i];
if (i != 0)
list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
ep->desc = NULL;
ep->stopped = 0;
INIT_LIST_HEAD(&ep->queue);
ep->pio_irqs = 0;
}
/* the rest was statically initialized, and is read-only */
}
/*
* until it's enabled, this UDC should be completely invisible
* to any USB host.
*/
static void udc_enable(struct pxa25x_udc *dev)
{
debug("udc: enabling udc\n");
udc_clear_mask_UDCCR(UDCCR_UDE);
/*
* Try to clear these bits before we enable the udc.
* Do not touch reset ack bit, we would take care of it in
* interrupt handle routine
*/
udc_ack_int_UDCCR(UDCCR_SUSIR|UDCCR_RESIR);
ep0_idle(dev);
dev->gadget.speed = USB_SPEED_UNKNOWN;
dev->stats.irqs = 0;
/*
* sequence taken from chapter 12.5.10, PXA250 AppProcDevManual:
* - enable UDC
* - if RESET is already in progress, ack interrupt
* - unmask reset interrupt
*/
udc_set_mask_UDCCR(UDCCR_UDE);
if (!(readl(&dev->regs->udccr) & UDCCR_UDA))
udc_ack_int_UDCCR(UDCCR_RSTIR);
if (dev->has_cfr /* UDC_RES2 is defined */) {
/*
* pxa255 (a0+) can avoid a set_config race that could
* prevent gadget drivers from configuring correctly
*/
writel(UDCCFR_ACM | UDCCFR_MB1, &dev->regs->udccfr);
}
/* enable suspend/resume and reset irqs */
udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM);
/* enable ep0 irqs */
clrbits_le32(&dev->regs->uicr0, UICR0_IM0);
/* if hardware supports it, pullup D+ and wait for reset */
pullup_on();
}
static inline void clear_ep_state(struct pxa25x_udc *dev)
{
unsigned i;
/*
* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
* fifos, and pending transactions mustn't be continued in any case.
*/
for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++)
nuke(&dev->ep[i], -ECONNABORTED);
}
static void handle_ep0(struct pxa25x_udc *dev)
{
u32 udccs0 = readl(&dev->regs->udccs[0]);
struct pxa25x_ep *ep = &dev->ep[0];
struct pxa25x_request *req;
union {
struct usb_ctrlrequest r;
u8 raw[8];
u32 word[2];
} u;
if (list_empty(&ep->queue))
req = NULL;
else
req = list_entry(ep->queue.next, struct pxa25x_request, queue);
/* clear stall status */
if (udccs0 & UDCCS0_SST) {
nuke(ep, -EPIPE);
writel(UDCCS0_SST, &dev->regs->udccs[0]);
stop_watchdog(dev);
ep0_idle(dev);
}
/* previous request unfinished? non-error iff back-to-back ... */
if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) {
nuke(ep, 0);
stop_watchdog(dev);
ep0_idle(dev);
}
switch (dev->ep0state) {
case EP0_IDLE:
/* late-breaking status? */
udccs0 = readl(&dev->regs->udccs[0]);
/* start control request? */
if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))
== (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) {
int i;
nuke(ep, -EPROTO);
/* read SETUP packet */
for (i = 0; i < 8; i++) {
if (unlikely(!(readl(&dev->regs->udccs[0]) &
UDCCS0_RNE))) {
bad_setup:
debug("SETUP %d!\n", i);
goto stall;
}
u.raw[i] = (u8)readb(&dev->regs->uddr0);
}
if (unlikely((readl(&dev->regs->udccs[0]) &
UDCCS0_RNE) != 0))
goto bad_setup;
got_setup:
debug("SETUP %02x.%02x v%04x i%04x l%04x\n",
u.r.bRequestType, u.r.bRequest,
le16_to_cpu(u.r.wValue),
le16_to_cpu(u.r.wIndex),
le16_to_cpu(u.r.wLength));
/* cope with automagic for some standard requests. */
dev->req_std = (u.r.bRequestType & USB_TYPE_MASK)
== USB_TYPE_STANDARD;
dev->req_config = 0;
dev->req_pending = 1;
switch (u.r.bRequest) {
/* hardware restricts gadget drivers here! */
case USB_REQ_SET_CONFIGURATION:
debug("GOT SET_CONFIGURATION\n");
if (u.r.bRequestType == USB_RECIP_DEVICE) {
/*
* reflect hardware's automagic
* up to the gadget driver.
*/
config_change:
dev->req_config = 1;
clear_ep_state(dev);
/*
* if !has_cfr, there's no synch
* else use AREN (later) not SA|OPR
* USIR0_IR0 acts edge sensitive
*/
}
break;
/* ... and here, even more ... */
case USB_REQ_SET_INTERFACE:
if (u.r.bRequestType == USB_RECIP_INTERFACE) {
/*
* udc hardware is broken by design:
* - altsetting may only be zero;
* - hw resets all interfaces' eps;
* - ep reset doesn't include halt(?).
*/
printf("broken set_interface (%d/%d)\n",
le16_to_cpu(u.r.wIndex),
le16_to_cpu(u.r.wValue));
goto config_change;
}
break;
/* hardware was supposed to hide this */
case USB_REQ_SET_ADDRESS:
debug("GOT SET ADDRESS\n");
if (u.r.bRequestType == USB_RECIP_DEVICE) {
ep0start(dev, 0, "address");
return;
}
break;
}
if (u.r.bRequestType & USB_DIR_IN)
dev->ep0state = EP0_IN_DATA_PHASE;
else
dev->ep0state = EP0_OUT_DATA_PHASE;
i = dev->driver->setup(&dev->gadget, &u.r);
if (i < 0) {
/* hardware automagic preventing STALL... */
if (dev->req_config) {
/*
* hardware sometimes neglects to tell
* tell us about config change events,
* so later ones may fail...
*/
printf("config change %02x fail %d?\n",
u.r.bRequest, i);
return;
/*
* TODO experiment: if has_cfr,
* hardware didn't ACK; maybe we
* could actually STALL!
*/
}
if (0) {
stall:
/* uninitialized when goto stall */
i = 0;
}
debug("protocol STALL, "
"%02x err %d\n",
readl(&dev->regs->udccs[0]), i);
/*
* the watchdog timer helps deal with cases
* where udc seems to clear FST wrongly, and
* then NAKs instead of STALLing.
*/
ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall");
start_watchdog(dev);
dev->ep0state = EP0_STALL;
/* deferred i/o == no response yet */
} else if (dev->req_pending) {
if (likely(dev->ep0state == EP0_IN_DATA_PHASE
|| dev->req_std || u.r.wLength))
ep0start(dev, 0, "defer");
else
ep0start(dev, UDCCS0_IPR, "defer/IPR");
}
/* expect at least one data or status stage irq */
return;
} else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA))
== (UDCCS0_OPR|UDCCS0_SA))) {
unsigned i;
/*
* pxa210/250 erratum 131 for B0/B1 says RNE lies.
* still observed on a pxa255 a0.
*/
debug("e131\n");
nuke(ep, -EPROTO);
/* read SETUP data, but don't trust it too much */
for (i = 0; i < 8; i++)
u.raw[i] = (u8)readb(&dev->regs->uddr0);
if ((u.r.bRequestType & USB_RECIP_MASK)
> USB_RECIP_OTHER)
goto stall;
if (u.word[0] == 0 && u.word[1] == 0)
goto stall;
goto got_setup;
} else {
/*
* some random early IRQ:
* - we acked FST
* - IPR cleared
* - OPR got set, without SA (likely status stage)
*/
debug("random IRQ %X %X\n", udccs0,
readl(&dev->regs->udccs[0]));
writel(udccs0 & (UDCCS0_SA|UDCCS0_OPR),
&dev->regs->udccs[0]);
}
break;
case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR etc */
if (udccs0 & UDCCS0_OPR) {
debug("ep0in premature status\n");
if (req)
done(ep, req, 0);
ep0_idle(dev);
} else /* irq was IPR clearing */ {
if (req) {
debug("next ep0 in packet\n");
/* this IN packet might finish the request */
(void) write_ep0_fifo(ep, req);
} /* else IN token before response was written */
}
break;
case EP0_OUT_DATA_PHASE: /* SET_DESCRIPTOR etc */
if (udccs0 & UDCCS0_OPR) {
if (req) {
/* this OUT packet might finish the request */
if (read_ep0_fifo(ep, req))
done(ep, req, 0);
/* else more OUT packets expected */
} /* else OUT token before read was issued */
} else /* irq was IPR clearing */ {
debug("ep0out premature status\n");
if (req)
done(ep, req, 0);
ep0_idle(dev);
}
break;
case EP0_END_XFER:
if (req)
done(ep, req, 0);
/*
* ack control-IN status (maybe in-zlp was skipped)
* also appears after some config change events.
*/
if (udccs0 & UDCCS0_OPR)
writel(UDCCS0_OPR, &dev->regs->udccs[0]);
ep0_idle(dev);
break;
case EP0_STALL:
writel(UDCCS0_FST, &dev->regs->udccs[0]);
break;
}
writel(USIR0_IR0, &dev->regs->usir0);
}
static void handle_ep(struct pxa25x_ep *ep)
{
struct pxa25x_request *req;
int is_in = ep->bEndpointAddress & USB_DIR_IN;
int completed;
u32 udccs, tmp;
do {
completed = 0;
if (likely(!list_empty(&ep->queue)))
req = list_entry(ep->queue.next,
struct pxa25x_request, queue);
else
req = NULL;
/* TODO check FST handling */
udccs = readl(ep->reg_udccs);
if (unlikely(is_in)) { /* irq from TPC, SST, or (ISO) TUR */
tmp = UDCCS_BI_TUR;
if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
tmp |= UDCCS_BI_SST;
tmp &= udccs;
if (likely(tmp))
writel(tmp, ep->reg_udccs);
if (req && likely((udccs & UDCCS_BI_TFS) != 0))
completed = write_fifo(ep, req);
} else { /* irq from RPC (or for ISO, ROF) */
if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
tmp = UDCCS_BO_SST | UDCCS_BO_DME;
else
tmp = UDCCS_IO_ROF | UDCCS_IO_DME;
tmp &= udccs;
if (likely(tmp))
writel(tmp, ep->reg_udccs);
/* fifos can hold packets, ready for reading... */
if (likely(req))
completed = read_fifo(ep, req);
else
pio_irq_disable(ep->bEndpointAddress);
}
ep->pio_irqs++;
} while (completed);
}
/*
* pxa25x_udc_irq - interrupt handler
*
* avoid delays in ep0 processing. the control handshaking isn't always
* under software control (pxa250c0 and the pxa255 are better), and delays
* could cause usb protocol errors.
*/
static struct pxa25x_udc memory;
static int
pxa25x_udc_irq(void)
{
struct pxa25x_udc *dev = &memory;
int handled;
test_watchdog(dev);
dev->stats.irqs++;
do {
u32 udccr = readl(&dev->regs->udccr);
handled = 0;
/* SUSpend Interrupt Request */
if (unlikely(udccr & UDCCR_SUSIR)) {
udc_ack_int_UDCCR(UDCCR_SUSIR);
handled = 1;
debug("USB suspend\n");
if (dev->gadget.speed != USB_SPEED_UNKNOWN
&& dev->driver
&& dev->driver->suspend)
dev->driver->suspend(&dev->gadget);
ep0_idle(dev);
}
/* RESume Interrupt Request */
if (unlikely(udccr & UDCCR_RESIR)) {
udc_ack_int_UDCCR(UDCCR_RESIR);
handled = 1;
debug("USB resume\n");
if (dev->gadget.speed != USB_SPEED_UNKNOWN
&& dev->driver
&& dev->driver->resume)
dev->driver->resume(&dev->gadget);
}
/* ReSeT Interrupt Request - USB reset */
if (unlikely(udccr & UDCCR_RSTIR)) {
udc_ack_int_UDCCR(UDCCR_RSTIR);
handled = 1;
if ((readl(&dev->regs->udccr) & UDCCR_UDA) == 0) {
debug("USB reset start\n");
/*
* reset driver and endpoints,
* in case that's not yet done
*/
stop_activity(dev, dev->driver);
} else {
debug("USB reset end\n");
dev->gadget.speed = USB_SPEED_FULL;
memset(&dev->stats, 0, sizeof dev->stats);
/* driver and endpoints are still reset */
}
} else {
u32 uicr0 = readl(&dev->regs->uicr0);
u32 uicr1 = readl(&dev->regs->uicr1);
u32 usir0 = readl(&dev->regs->usir0);
u32 usir1 = readl(&dev->regs->usir1);
usir0 = usir0 & ~uicr0;
usir1 = usir1 & ~uicr1;
int i;
if (unlikely(!usir0 && !usir1))
continue;
debug_cond(NOISY, "irq %02x.%02x\n", usir1, usir0);
/* control traffic */
if (usir0 & USIR0_IR0) {
dev->ep[0].pio_irqs++;
handle_ep0(dev);
handled = 1;
}
/* endpoint data transfers */
for (i = 0; i < 8; i++) {
u32 tmp = 1 << i;
if (i && (usir0 & tmp)) {
handle_ep(&dev->ep[i]);
setbits_le32(&dev->regs->usir0, tmp);
handled = 1;
}
#ifndef CONFIG_USB_PXA25X_SMALL
if (usir1 & tmp) {
handle_ep(&dev->ep[i+8]);
setbits_le32(&dev->regs->usir1, tmp);
handled = 1;
}
#endif
}
}
/* we could also ask for 1 msec SOF (SIR) interrupts */
} while (handled);
return IRQ_HANDLED;
}
/*-------------------------------------------------------------------------*/
/*
* this uses load-time allocation and initialization (instead of
* doing it at run-time) to save code, eliminate fault paths, and
* be more obviously correct.
*/
static struct pxa25x_udc memory = {
.regs = UDC_REGS,
.gadget = {
.ops = &pxa25x_udc_ops,
.ep0 = &memory.ep[0].ep,
.name = driver_name,
},
/* control endpoint */
.ep[0] = {
.ep = {
.name = ep0name,
.ops = &pxa25x_ep_ops,
.maxpacket = EP0_FIFO_SIZE,
},
.dev = &memory,
.reg_udccs = &UDC_REGS->udccs[0],
.reg_uddr = &UDC_REGS->uddr0,
},
/* first group of endpoints */
.ep[1] = {
.ep = {
.name = "ep1in-bulk",
.ops = &pxa25x_ep_ops,
.maxpacket = BULK_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = BULK_FIFO_SIZE,
.bEndpointAddress = USB_DIR_IN | 1,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.reg_udccs = &UDC_REGS->udccs[1],
.reg_uddr = &UDC_REGS->uddr1,
},
.ep[2] = {
.ep = {
.name = "ep2out-bulk",
.ops = &pxa25x_ep_ops,
.maxpacket = BULK_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = BULK_FIFO_SIZE,
.bEndpointAddress = 2,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.reg_udccs = &UDC_REGS->udccs[2],
.reg_ubcr = &UDC_REGS->ubcr2,
.reg_uddr = &UDC_REGS->uddr2,
},
#ifndef CONFIG_USB_PXA25X_SMALL
.ep[3] = {
.ep = {
.name = "ep3in-iso",
.ops = &pxa25x_ep_ops,
.maxpacket = ISO_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = ISO_FIFO_SIZE,
.bEndpointAddress = USB_DIR_IN | 3,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.reg_udccs = &UDC_REGS->udccs[3],
.reg_uddr = &UDC_REGS->uddr3,
},
.ep[4] = {
.ep = {
.name = "ep4out-iso",
.ops = &pxa25x_ep_ops,
.maxpacket = ISO_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = ISO_FIFO_SIZE,
.bEndpointAddress = 4,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.reg_udccs = &UDC_REGS->udccs[4],
.reg_ubcr = &UDC_REGS->ubcr4,
.reg_uddr = &UDC_REGS->uddr4,
},
.ep[5] = {
.ep = {
.name = "ep5in-int",
.ops = &pxa25x_ep_ops,
.maxpacket = INT_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = INT_FIFO_SIZE,
.bEndpointAddress = USB_DIR_IN | 5,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.reg_udccs = &UDC_REGS->udccs[5],
.reg_uddr = &UDC_REGS->uddr5,
},
/* second group of endpoints */
.ep[6] = {
.ep = {
.name = "ep6in-bulk",
.ops = &pxa25x_ep_ops,
.maxpacket = BULK_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = BULK_FIFO_SIZE,
.bEndpointAddress = USB_DIR_IN | 6,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.reg_udccs = &UDC_REGS->udccs[6],
.reg_uddr = &UDC_REGS->uddr6,
},
.ep[7] = {
.ep = {
.name = "ep7out-bulk",
.ops = &pxa25x_ep_ops,
.maxpacket = BULK_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = BULK_FIFO_SIZE,
.bEndpointAddress = 7,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.reg_udccs = &UDC_REGS->udccs[7],
.reg_ubcr = &UDC_REGS->ubcr7,
.reg_uddr = &UDC_REGS->uddr7,
},
.ep[8] = {
.ep = {
.name = "ep8in-iso",
.ops = &pxa25x_ep_ops,
.maxpacket = ISO_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = ISO_FIFO_SIZE,
.bEndpointAddress = USB_DIR_IN | 8,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.reg_udccs = &UDC_REGS->udccs[8],
.reg_uddr = &UDC_REGS->uddr8,
},
.ep[9] = {
.ep = {
.name = "ep9out-iso",
.ops = &pxa25x_ep_ops,
.maxpacket = ISO_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = ISO_FIFO_SIZE,
.bEndpointAddress = 9,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.reg_udccs = &UDC_REGS->udccs[9],
.reg_ubcr = &UDC_REGS->ubcr9,
.reg_uddr = &UDC_REGS->uddr9,
},
.ep[10] = {
.ep = {
.name = "ep10in-int",
.ops = &pxa25x_ep_ops,
.maxpacket = INT_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = INT_FIFO_SIZE,
.bEndpointAddress = USB_DIR_IN | 10,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.reg_udccs = &UDC_REGS->udccs[10],
.reg_uddr = &UDC_REGS->uddr10,
},
/* third group of endpoints */
.ep[11] = {
.ep = {
.name = "ep11in-bulk",
.ops = &pxa25x_ep_ops,
.maxpacket = BULK_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = BULK_FIFO_SIZE,
.bEndpointAddress = USB_DIR_IN | 11,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.reg_udccs = &UDC_REGS->udccs[11],
.reg_uddr = &UDC_REGS->uddr11,
},
.ep[12] = {
.ep = {
.name = "ep12out-bulk",
.ops = &pxa25x_ep_ops,
.maxpacket = BULK_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = BULK_FIFO_SIZE,
.bEndpointAddress = 12,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.reg_udccs = &UDC_REGS->udccs[12],
.reg_ubcr = &UDC_REGS->ubcr12,
.reg_uddr = &UDC_REGS->uddr12,
},
.ep[13] = {
.ep = {
.name = "ep13in-iso",
.ops = &pxa25x_ep_ops,
.maxpacket = ISO_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = ISO_FIFO_SIZE,
.bEndpointAddress = USB_DIR_IN | 13,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.reg_udccs = &UDC_REGS->udccs[13],
.reg_uddr = &UDC_REGS->uddr13,
},
.ep[14] = {
.ep = {
.name = "ep14out-iso",
.ops = &pxa25x_ep_ops,
.maxpacket = ISO_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = ISO_FIFO_SIZE,
.bEndpointAddress = 14,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.reg_udccs = &UDC_REGS->udccs[14],
.reg_ubcr = &UDC_REGS->ubcr14,
.reg_uddr = &UDC_REGS->uddr14,
},
.ep[15] = {
.ep = {
.name = "ep15in-int",
.ops = &pxa25x_ep_ops,
.maxpacket = INT_FIFO_SIZE,
},
.dev = &memory,
.fifo_size = INT_FIFO_SIZE,
.bEndpointAddress = USB_DIR_IN | 15,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.reg_udccs = &UDC_REGS->udccs[15],
.reg_uddr = &UDC_REGS->uddr15,
},
#endif /* !CONFIG_USB_PXA25X_SMALL */
};
static void udc_command(int cmd)
{
switch (cmd) {
case PXA2XX_UDC_CMD_CONNECT:
setbits_le32(GPDR(CONFIG_USB_DEV_PULLUP_GPIO),
GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO));
/* enable pullup */
writel(GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO),
GPCR(CONFIG_USB_DEV_PULLUP_GPIO));
debug("Connected to USB\n");
break;
case PXA2XX_UDC_CMD_DISCONNECT:
/* disable pullup resistor */
writel(GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO),
GPSR(CONFIG_USB_DEV_PULLUP_GPIO));
/* setup pin as input, line will float */
clrbits_le32(GPDR(CONFIG_USB_DEV_PULLUP_GPIO),
GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO));
debug("Disconnected from USB\n");
break;
}
}
static struct pxa2xx_udc_mach_info mach_info = {
.udc_command = udc_command,
};
/*
* when a driver is successfully registered, it will receive
* control requests including set_configuration(), which enables
* non-control requests. then usb traffic follows until a
* disconnect is reported. then a host may connect again, or
* the driver might get unbound.
*/
int usb_gadget_register_driver(struct usb_gadget_driver *driver)
{
struct pxa25x_udc *dev = &memory;
int retval;
uint32_t chiprev;
if (!driver
|| driver->speed < USB_SPEED_FULL
|| !driver->disconnect
|| !driver->setup)
return -EINVAL;
if (!dev)
return -ENODEV;
if (dev->driver)
return -EBUSY;
/* Enable clock for usb controller */
setbits_le32(CKEN, CKEN11_USB);
/* first hook up the driver ... */
dev->driver = driver;
dev->pullup = 1;
/* trigger chiprev-specific logic */
switch ((chiprev = pxa_get_cpu_revision())) {
case PXA255_A0:
dev->has_cfr = 1;
break;
case PXA250_A0:
case PXA250_A1:
/* A0/A1 "not released"; ep 13, 15 unusable */
/* fall through */
case PXA250_B2: case PXA210_B2:
case PXA250_B1: case PXA210_B1:
case PXA250_B0: case PXA210_B0:
/* OUT-DMA is broken ... */
/* fall through */
case PXA250_C0: case PXA210_C0:
break;
default:
printf("%s: unrecognized processor: %08x\n",
DRIVER_NAME, chiprev);
return -ENODEV;
}
the_controller = dev;
/* prepare watchdog timer */
dev->watchdog.running = 0;
dev->watchdog.period = 5000 * CONFIG_SYS_HZ / 1000000; /* 5 ms */
dev->watchdog.function = udc_watchdog;
dev->mach = &mach_info;
udc_disable(dev);
udc_reinit(dev);
dev->gadget.name = "pxa2xx_udc";
retval = driver->bind(&dev->gadget);
if (retval) {
printf("bind to driver %s --> error %d\n",
DRIVER_NAME, retval);
dev->driver = NULL;
return retval;
}
/*
* ... then enable host detection and ep0; and we're ready
* for set_configuration as well as eventual disconnect.
*/
printf("registered gadget driver '%s'\n", DRIVER_NAME);
pullup(dev);
dump_state(dev);
return 0;
}
static void
stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver)
{
int i;
/* don't disconnect drivers more than once */
if (dev->gadget.speed == USB_SPEED_UNKNOWN)
driver = NULL;
dev->gadget.speed = USB_SPEED_UNKNOWN;
/* prevent new request submissions, kill any outstanding requests */
for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
struct pxa25x_ep *ep = &dev->ep[i];
ep->stopped = 1;
nuke(ep, -ESHUTDOWN);
}
stop_watchdog(dev);
/* report disconnect; the driver is already quiesced */
if (driver)
driver->disconnect(&dev->gadget);
/* re-init driver-visible data structures */
udc_reinit(dev);
}
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
{
struct pxa25x_udc *dev = the_controller;
if (!dev)
return -ENODEV;
if (!driver || driver != dev->driver || !driver->unbind)
return -EINVAL;
local_irq_disable();
dev->pullup = 0;
pullup(dev);
stop_activity(dev, driver);
local_irq_enable();
driver->unbind(&dev->gadget);
dev->driver = NULL;
printf("unregistered gadget driver '%s'\n", DRIVER_NAME);
dump_state(dev);
the_controller = NULL;
clrbits_le32(CKEN, CKEN11_USB);
return 0;
}
extern void udc_disconnect(void)
{
setbits_le32(CKEN, CKEN11_USB);
udc_clear_mask_UDCCR(UDCCR_UDE);
udc_command(PXA2XX_UDC_CMD_DISCONNECT);
clrbits_le32(CKEN, CKEN11_USB);
}
/*-------------------------------------------------------------------------*/
extern int
usb_gadget_handle_interrupts(int index)
{
return pxa25x_udc_irq();
}