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pxa25x_udc.c
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pxa25x_udc.c
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/*
* 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
*
* 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
*
*/
/* #define VERBOSE_DEBUG */
#include <linux/device.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/prefetch.h>
#include <asm/byteorder.h>
#include <asm/dma.h>
#include <asm/gpio.h>
#include <asm/system.h>
#include <asm/mach-types.h>
#include <asm/unaligned.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
/*
* This driver is PXA25x only. Grab the right register definitions.
*/
#ifdef CONFIG_ARCH_PXA
#include <mach/pxa25x-udc.h>
#endif
#ifdef CONFIG_ARCH_LUBBOCK
#include <mach/lubbock.h>
#endif
#include <asm/mach/udc_pxa2xx.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 "30-June-2007"
#define DRIVER_DESC "PXA 25x USB Device Controller driver"
static const char driver_name [] = "pxa25x_udc";
static const char ep0name [] = "ep0";
#ifdef CONFIG_ARCH_IXP4XX
/* cpu-specific register addresses are compiled in to this code */
#ifdef CONFIG_ARCH_PXA
#error "Can't configure both IXP and PXA"
#endif
/* IXP doesn't yet support <linux/clk.h> */
#define clk_get(dev,name) NULL
#define clk_enable(clk) do { } while (0)
#define clk_disable(clk) do { } while (0)
#define clk_put(clk) do { } while (0)
#endif
#include "pxa25x_udc.h"
#ifdef CONFIG_USB_PXA25X_SMALL
#define SIZE_STR " (small)"
#else
#define SIZE_STR ""
#endif
/* ---------------------------------------------------------------------------
* 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;
int off_level = mach->gpio_pullup_inverted;
if (gpio_is_valid(mach->gpio_pullup))
gpio_set_value(mach->gpio_pullup, off_level);
else 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;
int on_level = !mach->gpio_pullup_inverted;
if (gpio_is_valid(mach->gpio_pullup))
gpio_set_value(mach->gpio_pullup, on_level);
else if (mach->udc_command)
mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
}
static void pio_irq_enable(int bEndpointAddress)
{
bEndpointAddress &= 0xf;
if (bEndpointAddress < 8)
UICR0 &= ~(1 << bEndpointAddress);
else {
bEndpointAddress -= 8;
UICR1 &= ~(1 << bEndpointAddress);
}
}
static void pio_irq_disable(int bEndpointAddress)
{
bEndpointAddress &= 0xf;
if (bEndpointAddress < 8)
UICR0 |= 1 << bEndpointAddress;
else {
bEndpointAddress -= 8;
UICR1 |= 1 << bEndpointAddress;
}
}
/* The UDCCR reg contains mask and interrupt status bits,
* so using '|=' isn't safe as it may ack an interrupt.
*/
#define UDCCR_MASK_BITS (UDCCR_REM | UDCCR_SRM | UDCCR_UDE)
static inline void udc_set_mask_UDCCR(int mask)
{
UDCCR = (UDCCR & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS);
}
static inline void udc_clear_mask_UDCCR(int mask)
{
UDCCR = (UDCCR & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS);
}
static inline void udc_ack_int_UDCCR(int mask)
{
/* udccr contains the bits we dont want to change */
__u32 udccr = UDCCR & UDCCR_MASK_BITS;
UDCCR = udccr | (mask & ~UDCCR_MASK_BITS);
}
/*
* 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
(desc->wMaxPacketSize)) {
DMSG("%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) {
DMSG("%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 (desc->wMaxPacketSize)
!= BULK_FIFO_SIZE)
|| !desc->wMaxPacketSize) {
DMSG("%s, bad %s maxpacket\n", __func__, _ep->name);
return -ERANGE;
}
dev = ep->dev;
if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
DMSG("%s, bogus device state\n", __func__);
return -ESHUTDOWN;
}
ep->desc = desc;
ep->stopped = 0;
ep->pio_irqs = 0;
ep->ep.maxpacket = le16_to_cpu (desc->wMaxPacketSize);
/* flush fifo (mostly for OUT buffers) */
pxa25x_ep_fifo_flush (_ep);
/* ... reset halt state too, if we could ... */
DBG(DBG_VERBOSE, "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) {
DMSG("%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);
DBG(DBG_VERBOSE, "%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)
DBG(DBG_VERBOSE, "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(volatile u32 *uddr, struct pxa25x_request *req, unsigned max)
{
u8 *buf;
unsigned length, count;
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--))
*uddr = *buf++;
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(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);
}
DBG(DBG_VERY_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.
*/
*ep->reg_udccs = UDCCS_BI_TPC;
if (is_short)
*ep->reg_udccs = UDCCS_BI_TSP;
/* 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 (*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)
{
UDCCS0 = flags|UDCCS0_SA|UDCCS0_OPR;
USIR0 = USIR0_IR0;
dev->req_pending = 0;
DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n",
__func__, tag, UDCCS0, flags);
}
static int
write_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
{
unsigned count;
int is_short;
count = write_packet(&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);
DBG(DBG_VERY_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
UDCCS0 = UDCCS0_IPR;
count = req->req.length;
done (ep, req, 0);
ep0_idle(ep->dev);
#ifndef CONFIG_ARCH_IXP4XX
#if 1
/* 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 ((UDCCS0 & UDCCS0_OPR) != 0) {
/* clear OPR, generate ack */
UDCCS0 = UDCCS0_OPR;
break;
}
count--;
udelay(1);
} while (count);
}
#endif
#endif
} 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)
{
for (;;) {
u32 udccs;
u8 *buf;
unsigned bufferspace, count, is_short;
/* 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 = *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 & *ep->reg_ubcr);
req->req.actual += min (count, bufferspace);
} else /* zlp */
count = 0;
is_short = (count < ep->ep.maxpacket);
DBG(DBG_VERY_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 = (u8) *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)
DMSG("%s overflow %d\n",
ep->ep.name, count);
req->req.status = -EOVERFLOW;
} else {
*buf++ = byte;
bufferspace--;
}
}
*ep->reg_udccs = UDCCS_BO_RPC;
/* 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 (UDCCS0 & UDCCS0_RNE) {
byte = (u8) 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)
DMSG("%s overflow\n", ep->ep.name);
req->req.status = -EOVERFLOW;
} else {
*buf++ = byte;
req->req.actual++;
bufferspace--;
}
}
UDCCS0 = UDCCS0_OPR | UDCCS0_IPR;
/* 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))) {
DMSG("%s, bad params\n", __func__);
return -EINVAL;
}
ep = container_of(_ep, struct pxa25x_ep, ep);
if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
DMSG("%s, bad ep\n", __func__);
return -EINVAL;
}
dev = ep->dev;
if (unlikely (!dev->driver
|| dev->gadget.speed == USB_SPEED_UNKNOWN)) {
DMSG("%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
(ep->desc->wMaxPacketSize)))
return -EMSGSIZE;
DBG(DBG_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) {
DBG(DBG_VERBOSE, "ep0 config ack%s\n",
dev->has_cfr ? "" : " raced");
if (dev->has_cfr)
UDCCFR = UDCCFR_AREN|UDCCFR_ACM
|UDCCFR_MB1;
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 || ((UDCCS0 & UDCCS0_RNE) != 0
&& read_ep0_fifo(ep, req))) {
ep0_idle(dev);
done(ep, req, 0);
req = NULL;
}
break;
default:
DMSG("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 ((*ep->reg_udccs & UDCCS_BI_TFS) != 0
&& write_fifo(ep, req))
req = NULL;
} else if ((*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) {
DMSG("%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.
*/
DMSG("only host can clear %s halt\n", _ep->name);
return -EROFS;
}
local_irq_save(flags);
if ((ep->bEndpointAddress & USB_DIR_IN) != 0
&& ((*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 */
*ep->reg_udccs = UDCCS_BI_FST|UDCCS_BI_FTF;
/* 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 (*ep->reg_udccs & UDCCS_BI_SST)
break;
udelay(20);
}
}
local_irq_restore(flags);
DBG(DBG_VERBOSE, "%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) {
DMSG("%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
|| (*ep->reg_udccs & UDCCS_BO_RFS) == 0)
return 0;
else
return (*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)) {
DMSG("%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 (((*ep->reg_udccs) & UDCCS_BO_RNE) != 0)
(void) *ep->reg_uddr;
return;
}
/* most IN status is the same, but ISO can't stall */
*ep->reg_udccs = UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
| (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
? 0 : UDCCS_BI_SST);
}
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 ((UFNRH & 0x07) << 8) | (UFNRL & 0xff);
}
static int pxa25x_udc_wakeup(struct usb_gadget *_gadget)
{
/* host may not have enabled remote wakeup */
if ((UDCCS0 & 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)
{
int is_active = udc->vbus && udc->pullup && !udc->suspended;
DMSG("%s\n", is_active ? "active" : "inactive");
if (is_active) {
if (!udc->active) {
udc->active = 1;
/* Enable clock for USB device */
clk_enable(udc->clk);
udc_enable(udc);
}
} else {
if (udc->active) {
if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
DMSG("disconnect %s\n", udc->driver
? udc->driver->driver.name
: "(no driver)");
stop_activity(udc, udc->driver);
}
udc_disable(udc);
/* Disable clock for USB device */
clk_disable(udc->clk);
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);
udc->vbus = is_active;
DMSG("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 (!gpio_is_valid(udc->mach->gpio_pullup) && !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