+++ /dev/null
-// 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 <log.h>
-#include <asm/byteorder.h>
-#include <asm/system.h>
-#include <asm/mach-types.h>
-#include <asm/unaligned.h>
-#include <dm/devres.h>
-#include <linux/bug.h>
-#include <linux/compat.h>
-#include <malloc.h>
-#include <asm/io.h>
-#include <asm/arch/pxa.h>
-#include <linux/delay.h>
-
-#include <linux/usb/ch9.h>
-#include <linux/usb/gadget.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();
-}
projects / platform / kernel / u-boot.git / commitdiff