--- /dev/null
+/*
+ * 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>
+ *
+ * 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
+ *
+ * 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 <usbdescriptors.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(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(desc->wMaxPacketSize)
+ != BULK_FIFO_SIZE)
+ || !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(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(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(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;
+
+ udc_disable(dev);
+ udc_reinit(dev);
+
+ dev->mach = &mach_info;
+
+ 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(void)
+{
+ return pxa25x_udc_irq();
+}
projects / u-boot / commitdiff