--- /dev/null
+/*
+ * at91_udc -- driver for at91-series USB peripheral controller
+ *
+ * Copyright (C) 2004 by Thomas Rathbone
+ * Copyright (C) 2005 by HP Labs
+ * Copyright (C) 2005 by David Brownell
+ *
+ * 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.
+ */
+
+#undef VERBOSE_DEBUG
+#undef PACKET_TRACE
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/prefetch.h>
+#include <linux/clk.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_data/atmel.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/atmel-matrix.h>
+
+#include "at91_udc.h"
+
+
+/*
+ * This controller is simple and PIO-only. It's used in many AT91-series
+ * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
+ * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
+ *
+ * This driver expects the board has been wired with two GPIOs supporting
+ * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
+ * testing hasn't covered such cases.)
+ *
+ * The pullup is most important (so it's integrated on sam926x parts). It
+ * provides software control over whether the host enumerates the device.
+ *
+ * The VBUS sensing helps during enumeration, and allows both USB clocks
+ * (and the transceiver) to stay gated off until they're necessary, saving
+ * power. During USB suspend, the 48 MHz clock is gated off in hardware;
+ * it may also be gated off by software during some Linux sleep states.
+ */
+
+#define DRIVER_VERSION "3 May 2006"
+
+static const char driver_name [] = "at91_udc";
+static const char * const ep_names[] = {
+ "ep0",
+ "ep1",
+ "ep2",
+ "ep3-int",
+ "ep4",
+ "ep5",
+};
+#define ep0name ep_names[0]
+
+#define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
+
+#define at91_udp_read(udc, reg) \
+ __raw_readl((udc)->udp_baseaddr + (reg))
+#define at91_udp_write(udc, reg, val) \
+ __raw_writel((val), (udc)->udp_baseaddr + (reg))
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_USB_GADGET_DEBUG_FILES
+
+#include <linux/seq_file.h>
+
+static const char debug_filename[] = "driver/udc";
+
+#define FOURBITS "%s%s%s%s"
+#define EIGHTBITS FOURBITS FOURBITS
+
+static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
+{
+ static char *types[] = {
+ "control", "out-iso", "out-bulk", "out-int",
+ "BOGUS", "in-iso", "in-bulk", "in-int"};
+
+ u32 csr;
+ struct at91_request *req;
+ unsigned long flags;
+ struct at91_udc *udc = ep->udc;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ csr = __raw_readl(ep->creg);
+
+ /* NOTE: not collecting per-endpoint irq statistics... */
+
+ seq_printf(s, "\n");
+ seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
+ ep->ep.name, ep->ep.maxpacket,
+ ep->is_in ? "in" : "out",
+ ep->is_iso ? " iso" : "",
+ ep->is_pingpong
+ ? (ep->fifo_bank ? "pong" : "ping")
+ : "",
+ ep->stopped ? " stopped" : "");
+ seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
+ csr,
+ (csr & 0x07ff0000) >> 16,
+ (csr & (1 << 15)) ? "enabled" : "disabled",
+ (csr & (1 << 11)) ? "DATA1" : "DATA0",
+ types[(csr & 0x700) >> 8],
+
+ /* iff type is control then print current direction */
+ (!(csr & 0x700))
+ ? ((csr & (1 << 7)) ? " IN" : " OUT")
+ : "",
+ (csr & (1 << 6)) ? " rxdatabk1" : "",
+ (csr & (1 << 5)) ? " forcestall" : "",
+ (csr & (1 << 4)) ? " txpktrdy" : "",
+
+ (csr & (1 << 3)) ? " stallsent" : "",
+ (csr & (1 << 2)) ? " rxsetup" : "",
+ (csr & (1 << 1)) ? " rxdatabk0" : "",
+ (csr & (1 << 0)) ? " txcomp" : "");
+ if (list_empty (&ep->queue))
+ seq_printf(s, "\t(queue empty)\n");
+
+ else list_for_each_entry (req, &ep->queue, queue) {
+ unsigned length = req->req.actual;
+
+ seq_printf(s, "\treq %p len %d/%d buf %p\n",
+ &req->req, length,
+ req->req.length, req->req.buf);
+ }
+ spin_unlock_irqrestore(&udc->lock, flags);
+}
+
+static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
+{
+ int i;
+
+ seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
+ (mask & (1 << 13)) ? " wakeup" : "",
+ (mask & (1 << 12)) ? " endbusres" : "",
+
+ (mask & (1 << 11)) ? " sofint" : "",
+ (mask & (1 << 10)) ? " extrsm" : "",
+ (mask & (1 << 9)) ? " rxrsm" : "",
+ (mask & (1 << 8)) ? " rxsusp" : "");
+ for (i = 0; i < 8; i++) {
+ if (mask & (1 << i))
+ seq_printf(s, " ep%d", i);
+ }
+ seq_printf(s, "\n");
+}
+
+static int proc_udc_show(struct seq_file *s, void *unused)
+{
+ struct at91_udc *udc = s->private;
+ struct at91_ep *ep;
+ u32 tmp;
+
+ seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
+
+ seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
+ udc->vbus ? "present" : "off",
+ udc->enabled
+ ? (udc->vbus ? "active" : "enabled")
+ : "disabled",
+ udc->gadget.is_selfpowered ? "self" : "VBUS",
+ udc->suspended ? ", suspended" : "",
+ udc->driver ? udc->driver->driver.name : "(none)");
+
+ /* don't access registers when interface isn't clocked */
+ if (!udc->clocked) {
+ seq_printf(s, "(not clocked)\n");
+ return 0;
+ }
+
+ tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
+ seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
+ (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
+ (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
+ (tmp & AT91_UDP_NUM));
+
+ tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
+ seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
+ (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
+ (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
+ (tmp & AT91_UDP_ESR) ? " esr" : "",
+ (tmp & AT91_UDP_CONFG) ? " confg" : "",
+ (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
+
+ tmp = at91_udp_read(udc, AT91_UDP_FADDR);
+ seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
+ (tmp & AT91_UDP_FEN) ? " fen" : "",
+ (tmp & AT91_UDP_FADD));
+
+ proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
+ proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
+
+ if (udc->enabled && udc->vbus) {
+ proc_ep_show(s, &udc->ep[0]);
+ list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
+ if (ep->ep.desc)
+ proc_ep_show(s, ep);
+ }
+ }
+ return 0;
+}
+
+static int proc_udc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, proc_udc_show, PDE_DATA(inode));
+}
+
+static const struct file_operations proc_ops = {
+ .owner = THIS_MODULE,
+ .open = proc_udc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void create_debug_file(struct at91_udc *udc)
+{
+ udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
+}
+
+static void remove_debug_file(struct at91_udc *udc)
+{
+ if (udc->pde)
+ remove_proc_entry(debug_filename, NULL);
+}
+
+#else
+
+static inline void create_debug_file(struct at91_udc *udc) {}
+static inline void remove_debug_file(struct at91_udc *udc) {}
+
+#endif
+
+
+/*-------------------------------------------------------------------------*/
+
+static void done(struct at91_ep *ep, struct at91_request *req, int status)
+{
+ unsigned stopped = ep->stopped;
+ struct at91_udc *udc = ep->udc;
+
+ list_del_init(&req->queue);
+ if (req->req.status == -EINPROGRESS)
+ req->req.status = status;
+ else
+ status = req->req.status;
+ if (status && status != -ESHUTDOWN)
+ VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
+
+ ep->stopped = 1;
+ spin_unlock(&udc->lock);
+ usb_gadget_giveback_request(&ep->ep, &req->req);
+ spin_lock(&udc->lock);
+ ep->stopped = stopped;
+
+ /* ep0 is always ready; other endpoints need a non-empty queue */
+ if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
+ at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* bits indicating OUT fifo has data ready */
+#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
+
+/*
+ * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
+ * back most of the value you just read (because of side effects, including
+ * bits that may change after reading and before writing).
+ *
+ * Except when changing a specific bit, always write values which:
+ * - clear SET_FX bits (setting them could change something)
+ * - set CLR_FX bits (clearing them could change something)
+ *
+ * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
+ * that shouldn't normally be changed.
+ *
+ * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
+ * implying a need to wait for one write to complete (test relevant bits)
+ * before starting the next write. This shouldn't be an issue given how
+ * infrequently we write, except maybe for write-then-read idioms.
+ */
+#define SET_FX (AT91_UDP_TXPKTRDY)
+#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
+ | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
+
+/* pull OUT packet data from the endpoint's fifo */
+static int read_fifo (struct at91_ep *ep, struct at91_request *req)
+{
+ u32 __iomem *creg = ep->creg;
+ u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
+ u32 csr;
+ u8 *buf;
+ unsigned int count, bufferspace, is_done;
+
+ buf = req->req.buf + req->req.actual;
+ bufferspace = req->req.length - req->req.actual;
+
+ /*
+ * there might be nothing to read if ep_queue() calls us,
+ * or if we already emptied both pingpong buffers
+ */
+rescan:
+ csr = __raw_readl(creg);
+ if ((csr & RX_DATA_READY) == 0)
+ return 0;
+
+ count = (csr & AT91_UDP_RXBYTECNT) >> 16;
+ if (count > ep->ep.maxpacket)
+ count = ep->ep.maxpacket;
+ if (count > bufferspace) {
+ DBG("%s buffer overflow\n", ep->ep.name);
+ req->req.status = -EOVERFLOW;
+ count = bufferspace;
+ }
+ __raw_readsb(dreg, buf, count);
+
+ /* release and swap pingpong mem bank */
+ csr |= CLR_FX;
+ if (ep->is_pingpong) {
+ if (ep->fifo_bank == 0) {
+ csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
+ ep->fifo_bank = 1;
+ } else {
+ csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
+ ep->fifo_bank = 0;
+ }
+ } else
+ csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
+ __raw_writel(csr, creg);
+
+ req->req.actual += count;
+ is_done = (count < ep->ep.maxpacket);
+ if (count == bufferspace)
+ is_done = 1;
+
+ PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
+ is_done ? " (done)" : "");
+
+ /*
+ * avoid extra trips through IRQ logic for packets already in
+ * the fifo ... maybe preventing an extra (expensive) OUT-NAK
+ */
+ if (is_done)
+ done(ep, req, 0);
+ else if (ep->is_pingpong) {
+ /*
+ * One dummy read to delay the code because of a HW glitch:
+ * CSR returns bad RXCOUNT when read too soon after updating
+ * RX_DATA_BK flags.
+ */
+ csr = __raw_readl(creg);
+
+ bufferspace -= count;
+ buf += count;
+ goto rescan;
+ }
+
+ return is_done;
+}
+
+/* load fifo for an IN packet */
+static int write_fifo(struct at91_ep *ep, struct at91_request *req)
+{
+ u32 __iomem *creg = ep->creg;
+ u32 csr = __raw_readl(creg);
+ u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
+ unsigned total, count, is_last;
+ u8 *buf;
+
+ /*
+ * TODO: allow for writing two packets to the fifo ... that'll
+ * reduce the amount of IN-NAKing, but probably won't affect
+ * throughput much. (Unlike preventing OUT-NAKing!)
+ */
+
+ /*
+ * If ep_queue() calls us, the queue is empty and possibly in
+ * odd states like TXCOMP not yet cleared (we do it, saving at
+ * least one IRQ) or the fifo not yet being free. Those aren't
+ * issues normally (IRQ handler fast path).
+ */
+ if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
+ if (csr & AT91_UDP_TXCOMP) {
+ csr |= CLR_FX;
+ csr &= ~(SET_FX | AT91_UDP_TXCOMP);
+ __raw_writel(csr, creg);
+ csr = __raw_readl(creg);
+ }
+ if (csr & AT91_UDP_TXPKTRDY)
+ return 0;
+ }
+
+ buf = req->req.buf + req->req.actual;
+ prefetch(buf);
+ total = req->req.length - req->req.actual;
+ if (ep->ep.maxpacket < total) {
+ count = ep->ep.maxpacket;
+ is_last = 0;
+ } else {
+ count = total;
+ is_last = (count < ep->ep.maxpacket) || !req->req.zero;
+ }
+
+ /*
+ * Write the packet, maybe it's a ZLP.
+ *
+ * NOTE: incrementing req->actual before we receive the ACK means
+ * gadget driver IN bytecounts can be wrong in fault cases. That's
+ * fixable with PIO drivers like this one (save "count" here, and
+ * do the increment later on TX irq), but not for most DMA hardware.
+ *
+ * So all gadget drivers must accept that potential error. Some
+ * hardware supports precise fifo status reporting, letting them
+ * recover when the actual bytecount matters (e.g. for USB Test
+ * and Measurement Class devices).
+ */
+ __raw_writesb(dreg, buf, count);
+ csr &= ~SET_FX;
+ csr |= CLR_FX | AT91_UDP_TXPKTRDY;
+ __raw_writel(csr, creg);
+ req->req.actual += count;
+
+ PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
+ is_last ? " (done)" : "");
+ if (is_last)
+ done(ep, req, 0);
+ return is_last;
+}
+
+static void nuke(struct at91_ep *ep, int status)
+{
+ struct at91_request *req;
+
+ /* terminate any request in the queue */
+ ep->stopped = 1;
+ if (list_empty(&ep->queue))
+ return;
+
+ VDBG("%s %s\n", __func__, ep->ep.name);
+ while (!list_empty(&ep->queue)) {
+ req = list_entry(ep->queue.next, struct at91_request, queue);
+ done(ep, req, status);
+ }
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int at91_ep_enable(struct usb_ep *_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
+ struct at91_udc *udc;
+ u16 maxpacket;
+ u32 tmp;
+ unsigned long flags;
+
+ if (!_ep || !ep
+ || !desc || _ep->name == ep0name
+ || desc->bDescriptorType != USB_DT_ENDPOINT
+ || (maxpacket = usb_endpoint_maxp(desc)) == 0
+ || maxpacket > ep->maxpacket) {
+ DBG("bad ep or descriptor\n");
+ return -EINVAL;
+ }
+
+ udc = ep->udc;
+ if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
+ DBG("bogus device state\n");
+ return -ESHUTDOWN;
+ }
+
+ tmp = usb_endpoint_type(desc);
+ switch (tmp) {
+ case USB_ENDPOINT_XFER_CONTROL:
+ DBG("only one control endpoint\n");
+ return -EINVAL;
+ case USB_ENDPOINT_XFER_INT:
+ if (maxpacket > 64)
+ goto bogus_max;
+ break;
+ case USB_ENDPOINT_XFER_BULK:
+ switch (maxpacket) {
+ case 8:
+ case 16:
+ case 32:
+ case 64:
+ goto ok;
+ }
+bogus_max:
+ DBG("bogus maxpacket %d\n", maxpacket);
+ return -EINVAL;
+ case USB_ENDPOINT_XFER_ISOC:
+ if (!ep->is_pingpong) {
+ DBG("iso requires double buffering\n");
+ return -EINVAL;
+ }
+ break;
+ }
+
+ok:
+ spin_lock_irqsave(&udc->lock, flags);
+
+ /* initialize endpoint to match this descriptor */
+ ep->is_in = usb_endpoint_dir_in(desc);
+ ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
+ ep->stopped = 0;
+ if (ep->is_in)
+ tmp |= 0x04;
+ tmp <<= 8;
+ tmp |= AT91_UDP_EPEDS;
+ __raw_writel(tmp, ep->creg);
+
+ ep->ep.maxpacket = maxpacket;
+
+ /*
+ * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
+ * since endpoint resets don't reset hw pingpong state.
+ */
+ at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
+ at91_udp_write(udc, AT91_UDP_RST_EP, 0);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return 0;
+}
+
+static int at91_ep_disable (struct usb_ep * _ep)
+{
+ struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
+ struct at91_udc *udc = ep->udc;
+ unsigned long flags;
+
+ if (ep == &ep->udc->ep[0])
+ return -EINVAL;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ nuke(ep, -ESHUTDOWN);
+
+ /* restore the endpoint's pristine config */
+ ep->ep.desc = NULL;
+ ep->ep.maxpacket = ep->maxpacket;
+
+ /* reset fifos and endpoint */
+ if (ep->udc->clocked) {
+ at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
+ at91_udp_write(udc, AT91_UDP_RST_EP, 0);
+ __raw_writel(0, ep->creg);
+ }
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return 0;
+}
+
+/*
+ * this is a PIO-only driver, so there's nothing
+ * interesting for request or buffer allocation.
+ */
+
+static struct usb_request *
+at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
+{
+ struct at91_request *req;
+
+ req = kzalloc(sizeof (struct at91_request), gfp_flags);
+ if (!req)
+ return NULL;
+
+ INIT_LIST_HEAD(&req->queue);
+ return &req->req;
+}
+
+static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct at91_request *req;
+
+ req = container_of(_req, struct at91_request, req);
+ BUG_ON(!list_empty(&req->queue));
+ kfree(req);
+}
+
+static int at91_ep_queue(struct usb_ep *_ep,
+ struct usb_request *_req, gfp_t gfp_flags)
+{
+ struct at91_request *req;
+ struct at91_ep *ep;
+ struct at91_udc *udc;
+ int status;
+ unsigned long flags;
+
+ req = container_of(_req, struct at91_request, req);
+ ep = container_of(_ep, struct at91_ep, ep);
+
+ if (!_req || !_req->complete
+ || !_req->buf || !list_empty(&req->queue)) {
+ DBG("invalid request\n");
+ return -EINVAL;
+ }
+
+ if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
+ DBG("invalid ep\n");
+ return -EINVAL;
+ }
+
+ udc = ep->udc;
+
+ if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
+ DBG("invalid device\n");
+ return -EINVAL;
+ }
+
+ _req->status = -EINPROGRESS;
+ _req->actual = 0;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ /* try to kickstart any empty and idle queue */
+ if (list_empty(&ep->queue) && !ep->stopped) {
+ int is_ep0;
+
+ /*
+ * If this control request has a non-empty DATA stage, this
+ * will start that stage. It works just like a non-control
+ * request (until the status stage starts, maybe early).
+ *
+ * If the data stage is empty, then this starts a successful
+ * IN/STATUS stage. (Unsuccessful ones use set_halt.)
+ */
+ is_ep0 = (ep->ep.name == ep0name);
+ if (is_ep0) {
+ u32 tmp;
+
+ if (!udc->req_pending) {
+ status = -EINVAL;
+ goto done;
+ }
+
+ /*
+ * defer changing CONFG until after the gadget driver
+ * reconfigures the endpoints.
+ */
+ if (udc->wait_for_config_ack) {
+ tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
+ tmp ^= AT91_UDP_CONFG;
+ VDBG("toggle config\n");
+ at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
+ }
+ if (req->req.length == 0) {
+ep0_in_status:
+ PACKET("ep0 in/status\n");
+ status = 0;
+ tmp = __raw_readl(ep->creg);
+ tmp &= ~SET_FX;
+ tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
+ __raw_writel(tmp, ep->creg);
+ udc->req_pending = 0;
+ goto done;
+ }
+ }
+
+ if (ep->is_in)
+ status = write_fifo(ep, req);
+ else {
+ status = read_fifo(ep, req);
+
+ /* IN/STATUS stage is otherwise triggered by irq */
+ if (status && is_ep0)
+ goto ep0_in_status;
+ }
+ } else
+ status = 0;
+
+ if (req && !status) {
+ list_add_tail (&req->queue, &ep->queue);
+ at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
+ }
+done:
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return (status < 0) ? status : 0;
+}
+
+static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct at91_ep *ep;
+ struct at91_request *req;
+ unsigned long flags;
+ struct at91_udc *udc;
+
+ ep = container_of(_ep, struct at91_ep, ep);
+ if (!_ep || ep->ep.name == ep0name)
+ return -EINVAL;
+
+ udc = ep->udc;
+
+ spin_lock_irqsave(&udc->lock, 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) {
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return -EINVAL;
+ }
+
+ done(ep, req, -ECONNRESET);
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return 0;
+}
+
+static int at91_ep_set_halt(struct usb_ep *_ep, int value)
+{
+ struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
+ struct at91_udc *udc = ep->udc;
+ u32 __iomem *creg;
+ u32 csr;
+ unsigned long flags;
+ int status = 0;
+
+ if (!_ep || ep->is_iso || !ep->udc->clocked)
+ return -EINVAL;
+
+ creg = ep->creg;
+ spin_lock_irqsave(&udc->lock, flags);
+
+ csr = __raw_readl(creg);
+
+ /*
+ * fail with still-busy IN endpoints, ensuring correct sequencing
+ * of data tx then stall. note that the fifo rx bytecount isn't
+ * completely accurate as a tx bytecount.
+ */
+ if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
+ status = -EAGAIN;
+ else {
+ csr |= CLR_FX;
+ csr &= ~SET_FX;
+ if (value) {
+ csr |= AT91_UDP_FORCESTALL;
+ VDBG("halt %s\n", ep->ep.name);
+ } else {
+ at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
+ at91_udp_write(udc, AT91_UDP_RST_EP, 0);
+ csr &= ~AT91_UDP_FORCESTALL;
+ }
+ __raw_writel(csr, creg);
+ }
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return status;
+}
+
+static const struct usb_ep_ops at91_ep_ops = {
+ .enable = at91_ep_enable,
+ .disable = at91_ep_disable,
+ .alloc_request = at91_ep_alloc_request,
+ .free_request = at91_ep_free_request,
+ .queue = at91_ep_queue,
+ .dequeue = at91_ep_dequeue,
+ .set_halt = at91_ep_set_halt,
+ /* there's only imprecise fifo status reporting */
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int at91_get_frame(struct usb_gadget *gadget)
+{
+ struct at91_udc *udc = to_udc(gadget);
+
+ if (!to_udc(gadget)->clocked)
+ return -EINVAL;
+ return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
+}
+
+static int at91_wakeup(struct usb_gadget *gadget)
+{
+ struct at91_udc *udc = to_udc(gadget);
+ u32 glbstate;
+ int status = -EINVAL;
+ unsigned long flags;
+
+ DBG("%s\n", __func__ );
+ spin_lock_irqsave(&udc->lock, flags);
+
+ if (!udc->clocked || !udc->suspended)
+ goto done;
+
+ /* NOTE: some "early versions" handle ESR differently ... */
+
+ glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
+ if (!(glbstate & AT91_UDP_ESR))
+ goto done;
+ glbstate |= AT91_UDP_ESR;
+ at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
+
+done:
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return status;
+}
+
+/* reinit == restore initial software state */
+static void udc_reinit(struct at91_udc *udc)
+{
+ u32 i;
+
+ INIT_LIST_HEAD(&udc->gadget.ep_list);
+ INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ struct at91_ep *ep = &udc->ep[i];
+
+ if (i != 0)
+ list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
+ ep->ep.desc = NULL;
+ ep->stopped = 0;
+ ep->fifo_bank = 0;
+ usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
+ ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
+ /* initialize one queue per endpoint */
+ INIT_LIST_HEAD(&ep->queue);
+ }
+}
+
+static void reset_gadget(struct at91_udc *udc)
+{
+ struct usb_gadget_driver *driver = udc->driver;
+ int i;
+
+ if (udc->gadget.speed == USB_SPEED_UNKNOWN)
+ driver = NULL;
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+ udc->suspended = 0;
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ struct at91_ep *ep = &udc->ep[i];
+
+ ep->stopped = 1;
+ nuke(ep, -ESHUTDOWN);
+ }
+ if (driver) {
+ spin_unlock(&udc->lock);
+ usb_gadget_udc_reset(&udc->gadget, driver);
+ spin_lock(&udc->lock);
+ }
+
+ udc_reinit(udc);
+}
+
+static void stop_activity(struct at91_udc *udc)
+{
+ struct usb_gadget_driver *driver = udc->driver;
+ int i;
+
+ if (udc->gadget.speed == USB_SPEED_UNKNOWN)
+ driver = NULL;
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+ udc->suspended = 0;
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ struct at91_ep *ep = &udc->ep[i];
+ ep->stopped = 1;
+ nuke(ep, -ESHUTDOWN);
+ }
+ if (driver) {
+ spin_unlock(&udc->lock);
+ driver->disconnect(&udc->gadget);
+ spin_lock(&udc->lock);
+ }
+
+ udc_reinit(udc);
+}
+
+static void clk_on(struct at91_udc *udc)
+{
+ if (udc->clocked)
+ return;
+ udc->clocked = 1;
+
+ clk_enable(udc->iclk);
+ clk_enable(udc->fclk);
+}
+
+static void clk_off(struct at91_udc *udc)
+{
+ if (!udc->clocked)
+ return;
+ udc->clocked = 0;
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+ clk_disable(udc->fclk);
+ clk_disable(udc->iclk);
+}
+
+/*
+ * activate/deactivate link with host; minimize power usage for
+ * inactive links by cutting clocks and transceiver power.
+ */
+static void pullup(struct at91_udc *udc, int is_on)
+{
+ if (!udc->enabled || !udc->vbus)
+ is_on = 0;
+ DBG("%sactive\n", is_on ? "" : "in");
+
+ if (is_on) {
+ clk_on(udc);
+ at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
+ at91_udp_write(udc, AT91_UDP_TXVC, 0);
+ } else {
+ stop_activity(udc);
+ at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
+ at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
+ clk_off(udc);
+ }
+
+ if (udc->caps && udc->caps->pullup)
+ udc->caps->pullup(udc, is_on);
+}
+
+/* vbus is here! turn everything on that's ready */
+static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
+{
+ struct at91_udc *udc = to_udc(gadget);
+ unsigned long flags;
+
+ /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
+ spin_lock_irqsave(&udc->lock, flags);
+ udc->vbus = (is_active != 0);
+ if (udc->driver)
+ pullup(udc, is_active);
+ else
+ pullup(udc, 0);
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return 0;
+}
+
+static int at91_pullup(struct usb_gadget *gadget, int is_on)
+{
+ struct at91_udc *udc = to_udc(gadget);
+ unsigned long flags;
+
+ spin_lock_irqsave(&udc->lock, flags);
+ udc->enabled = is_on = !!is_on;
+ pullup(udc, is_on);
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return 0;
+}
+
+static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
+{
+ struct at91_udc *udc = to_udc(gadget);
+ unsigned long flags;
+
+ spin_lock_irqsave(&udc->lock, flags);
+ gadget->is_selfpowered = (is_on != 0);
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return 0;
+}
+
+static int at91_start(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver);
+static int at91_stop(struct usb_gadget *gadget);
+
+static const struct usb_gadget_ops at91_udc_ops = {
+ .get_frame = at91_get_frame,
+ .wakeup = at91_wakeup,
+ .set_selfpowered = at91_set_selfpowered,
+ .vbus_session = at91_vbus_session,
+ .pullup = at91_pullup,
+ .udc_start = at91_start,
+ .udc_stop = at91_stop,
+
+ /*
+ * VBUS-powered devices may also also want to support bigger
+ * power budgets after an appropriate SET_CONFIGURATION.
+ */
+ /* .vbus_power = at91_vbus_power, */
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int handle_ep(struct at91_ep *ep)
+{
+ struct at91_request *req;
+ u32 __iomem *creg = ep->creg;
+ u32 csr = __raw_readl(creg);
+
+ if (!list_empty(&ep->queue))
+ req = list_entry(ep->queue.next,
+ struct at91_request, queue);
+ else
+ req = NULL;
+
+ if (ep->is_in) {
+ if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
+ csr |= CLR_FX;
+ csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
+ __raw_writel(csr, creg);
+ }
+ if (req)
+ return write_fifo(ep, req);
+
+ } else {
+ if (csr & AT91_UDP_STALLSENT) {
+ /* STALLSENT bit == ISOERR */
+ if (ep->is_iso && req)
+ req->req.status = -EILSEQ;
+ csr |= CLR_FX;
+ csr &= ~(SET_FX | AT91_UDP_STALLSENT);
+ __raw_writel(csr, creg);
+ csr = __raw_readl(creg);
+ }
+ if (req && (csr & RX_DATA_READY))
+ return read_fifo(ep, req);
+ }
+ return 0;
+}
+
+union setup {
+ u8 raw[8];
+ struct usb_ctrlrequest r;
+};
+
+static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
+{
+ u32 __iomem *creg = ep->creg;
+ u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
+ unsigned rxcount, i = 0;
+ u32 tmp;
+ union setup pkt;
+ int status = 0;
+
+ /* read and ack SETUP; hard-fail for bogus packets */
+ rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
+ if (likely(rxcount == 8)) {
+ while (rxcount--)
+ pkt.raw[i++] = __raw_readb(dreg);
+ if (pkt.r.bRequestType & USB_DIR_IN) {
+ csr |= AT91_UDP_DIR;
+ ep->is_in = 1;
+ } else {
+ csr &= ~AT91_UDP_DIR;
+ ep->is_in = 0;
+ }
+ } else {
+ /* REVISIT this happens sometimes under load; why?? */
+ ERR("SETUP len %d, csr %08x\n", rxcount, csr);
+ status = -EINVAL;
+ }
+ csr |= CLR_FX;
+ csr &= ~(SET_FX | AT91_UDP_RXSETUP);
+ __raw_writel(csr, creg);
+ udc->wait_for_addr_ack = 0;
+ udc->wait_for_config_ack = 0;
+ ep->stopped = 0;
+ if (unlikely(status != 0))
+ goto stall;
+
+#define w_index le16_to_cpu(pkt.r.wIndex)
+#define w_value le16_to_cpu(pkt.r.wValue)
+#define w_length le16_to_cpu(pkt.r.wLength)
+
+ VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
+ pkt.r.bRequestType, pkt.r.bRequest,
+ w_value, w_index, w_length);
+
+ /*
+ * A few standard requests get handled here, ones that touch
+ * hardware ... notably for device and endpoint features.
+ */
+ udc->req_pending = 1;
+ csr = __raw_readl(creg);
+ csr |= CLR_FX;
+ csr &= ~SET_FX;
+ switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
+
+ case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
+ | USB_REQ_SET_ADDRESS:
+ __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
+ udc->addr = w_value;
+ udc->wait_for_addr_ack = 1;
+ udc->req_pending = 0;
+ /* FADDR is set later, when we ack host STATUS */
+ return;
+
+ case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
+ | USB_REQ_SET_CONFIGURATION:
+ tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
+ if (pkt.r.wValue)
+ udc->wait_for_config_ack = (tmp == 0);
+ else
+ udc->wait_for_config_ack = (tmp != 0);
+ if (udc->wait_for_config_ack)
+ VDBG("wait for config\n");
+ /* CONFG is toggled later, if gadget driver succeeds */
+ break;
+
+ /*
+ * Hosts may set or clear remote wakeup status, and
+ * devices may report they're VBUS powered.
+ */
+ case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
+ | USB_REQ_GET_STATUS:
+ tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED);
+ if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
+ tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
+ PACKET("get device status\n");
+ __raw_writeb(tmp, dreg);
+ __raw_writeb(0, dreg);
+ goto write_in;
+ /* then STATUS starts later, automatically */
+ case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
+ | USB_REQ_SET_FEATURE:
+ if (w_value != USB_DEVICE_REMOTE_WAKEUP)
+ goto stall;
+ tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
+ tmp |= AT91_UDP_ESR;
+ at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
+ goto succeed;
+ case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
+ | USB_REQ_CLEAR_FEATURE:
+ if (w_value != USB_DEVICE_REMOTE_WAKEUP)
+ goto stall;
+ tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
+ tmp &= ~AT91_UDP_ESR;
+ at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
+ goto succeed;
+
+ /*
+ * Interfaces have no feature settings; this is pretty useless.
+ * we won't even insist the interface exists...
+ */
+ case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
+ | USB_REQ_GET_STATUS:
+ PACKET("get interface status\n");
+ __raw_writeb(0, dreg);
+ __raw_writeb(0, dreg);
+ goto write_in;
+ /* then STATUS starts later, automatically */
+ case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
+ | USB_REQ_SET_FEATURE:
+ case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
+ | USB_REQ_CLEAR_FEATURE:
+ goto stall;
+
+ /*
+ * Hosts may clear bulk/intr endpoint halt after the gadget
+ * driver sets it (not widely used); or set it (for testing)
+ */
+ case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
+ | USB_REQ_GET_STATUS:
+ tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
+ ep = &udc->ep[tmp];
+ if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
+ goto stall;
+
+ if (tmp) {
+ if ((w_index & USB_DIR_IN)) {
+ if (!ep->is_in)
+ goto stall;
+ } else if (ep->is_in)
+ goto stall;
+ }
+ PACKET("get %s status\n", ep->ep.name);
+ if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
+ tmp = (1 << USB_ENDPOINT_HALT);
+ else
+ tmp = 0;
+ __raw_writeb(tmp, dreg);
+ __raw_writeb(0, dreg);
+ goto write_in;
+ /* then STATUS starts later, automatically */
+ case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
+ | USB_REQ_SET_FEATURE:
+ tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
+ ep = &udc->ep[tmp];
+ if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
+ goto stall;
+ if (!ep->ep.desc || ep->is_iso)
+ goto stall;
+ if ((w_index & USB_DIR_IN)) {
+ if (!ep->is_in)
+ goto stall;
+ } else if (ep->is_in)
+ goto stall;
+
+ tmp = __raw_readl(ep->creg);
+ tmp &= ~SET_FX;
+ tmp |= CLR_FX | AT91_UDP_FORCESTALL;
+ __raw_writel(tmp, ep->creg);
+ goto succeed;
+ case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
+ | USB_REQ_CLEAR_FEATURE:
+ tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
+ ep = &udc->ep[tmp];
+ if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
+ goto stall;
+ if (tmp == 0)
+ goto succeed;
+ if (!ep->ep.desc || ep->is_iso)
+ goto stall;
+ if ((w_index & USB_DIR_IN)) {
+ if (!ep->is_in)
+ goto stall;
+ } else if (ep->is_in)
+ goto stall;
+
+ at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
+ at91_udp_write(udc, AT91_UDP_RST_EP, 0);
+ tmp = __raw_readl(ep->creg);
+ tmp |= CLR_FX;
+ tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
+ __raw_writel(tmp, ep->creg);
+ if (!list_empty(&ep->queue))
+ handle_ep(ep);
+ goto succeed;
+ }
+
+#undef w_value
+#undef w_index
+#undef w_length
+
+ /* pass request up to the gadget driver */
+ if (udc->driver) {
+ spin_unlock(&udc->lock);
+ status = udc->driver->setup(&udc->gadget, &pkt.r);
+ spin_lock(&udc->lock);
+ }
+ else
+ status = -ENODEV;
+ if (status < 0) {
+stall:
+ VDBG("req %02x.%02x protocol STALL; stat %d\n",
+ pkt.r.bRequestType, pkt.r.bRequest, status);
+ csr |= AT91_UDP_FORCESTALL;
+ __raw_writel(csr, creg);
+ udc->req_pending = 0;
+ }
+ return;
+
+succeed:
+ /* immediate successful (IN) STATUS after zero length DATA */
+ PACKET("ep0 in/status\n");
+write_in:
+ csr |= AT91_UDP_TXPKTRDY;
+ __raw_writel(csr, creg);
+ udc->req_pending = 0;
+}
+
+static void handle_ep0(struct at91_udc *udc)
+{
+ struct at91_ep *ep0 = &udc->ep[0];
+ u32 __iomem *creg = ep0->creg;
+ u32 csr = __raw_readl(creg);
+ struct at91_request *req;
+
+ if (unlikely(csr & AT91_UDP_STALLSENT)) {
+ nuke(ep0, -EPROTO);
+ udc->req_pending = 0;
+ csr |= CLR_FX;
+ csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
+ __raw_writel(csr, creg);
+ VDBG("ep0 stalled\n");
+ csr = __raw_readl(creg);
+ }
+ if (csr & AT91_UDP_RXSETUP) {
+ nuke(ep0, 0);
+ udc->req_pending = 0;
+ handle_setup(udc, ep0, csr);
+ return;
+ }
+
+ if (list_empty(&ep0->queue))
+ req = NULL;
+ else
+ req = list_entry(ep0->queue.next, struct at91_request, queue);
+
+ /* host ACKed an IN packet that we sent */
+ if (csr & AT91_UDP_TXCOMP) {
+ csr |= CLR_FX;
+ csr &= ~(SET_FX | AT91_UDP_TXCOMP);
+
+ /* write more IN DATA? */
+ if (req && ep0->is_in) {
+ if (handle_ep(ep0))
+ udc->req_pending = 0;
+
+ /*
+ * Ack after:
+ * - last IN DATA packet (including GET_STATUS)
+ * - IN/STATUS for OUT DATA
+ * - IN/STATUS for any zero-length DATA stage
+ * except for the IN DATA case, the host should send
+ * an OUT status later, which we'll ack.
+ */
+ } else {
+ udc->req_pending = 0;
+ __raw_writel(csr, creg);
+
+ /*
+ * SET_ADDRESS takes effect only after the STATUS
+ * (to the original address) gets acked.
+ */
+ if (udc->wait_for_addr_ack) {
+ u32 tmp;
+
+ at91_udp_write(udc, AT91_UDP_FADDR,
+ AT91_UDP_FEN | udc->addr);
+ tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
+ tmp &= ~AT91_UDP_FADDEN;
+ if (udc->addr)
+ tmp |= AT91_UDP_FADDEN;
+ at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
+
+ udc->wait_for_addr_ack = 0;
+ VDBG("address %d\n", udc->addr);
+ }
+ }
+ }
+
+ /* OUT packet arrived ... */
+ else if (csr & AT91_UDP_RX_DATA_BK0) {
+ csr |= CLR_FX;
+ csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
+
+ /* OUT DATA stage */
+ if (!ep0->is_in) {
+ if (req) {
+ if (handle_ep(ep0)) {
+ /* send IN/STATUS */
+ PACKET("ep0 in/status\n");
+ csr = __raw_readl(creg);
+ csr &= ~SET_FX;
+ csr |= CLR_FX | AT91_UDP_TXPKTRDY;
+ __raw_writel(csr, creg);
+ udc->req_pending = 0;
+ }
+ } else if (udc->req_pending) {
+ /*
+ * AT91 hardware has a hard time with this
+ * "deferred response" mode for control-OUT
+ * transfers. (For control-IN it's fine.)
+ *
+ * The normal solution leaves OUT data in the
+ * fifo until the gadget driver is ready.
+ * We couldn't do that here without disabling
+ * the IRQ that tells about SETUP packets,
+ * e.g. when the host gets impatient...
+ *
+ * Working around it by copying into a buffer
+ * would almost be a non-deferred response,
+ * except that it wouldn't permit reliable
+ * stalling of the request. Instead, demand
+ * that gadget drivers not use this mode.
+ */
+ DBG("no control-OUT deferred responses!\n");
+ __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
+ udc->req_pending = 0;
+ }
+
+ /* STATUS stage for control-IN; ack. */
+ } else {
+ PACKET("ep0 out/status ACK\n");
+ __raw_writel(csr, creg);
+
+ /* "early" status stage */
+ if (req)
+ done(ep0, req, 0);
+ }
+ }
+}
+
+static irqreturn_t at91_udc_irq (int irq, void *_udc)
+{
+ struct at91_udc *udc = _udc;
+ u32 rescans = 5;
+ int disable_clock = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ if (!udc->clocked) {
+ clk_on(udc);
+ disable_clock = 1;
+ }
+
+ while (rescans--) {
+ u32 status;
+
+ status = at91_udp_read(udc, AT91_UDP_ISR)
+ & at91_udp_read(udc, AT91_UDP_IMR);
+ if (!status)
+ break;
+
+ /* USB reset irq: not maskable */
+ if (status & AT91_UDP_ENDBUSRES) {
+ at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
+ at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
+ /* Atmel code clears this irq twice */
+ at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
+ at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
+ VDBG("end bus reset\n");
+ udc->addr = 0;
+ reset_gadget(udc);
+
+ /* enable ep0 */
+ at91_udp_write(udc, AT91_UDP_CSR(0),
+ AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
+ udc->gadget.speed = USB_SPEED_FULL;
+ udc->suspended = 0;
+ at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
+
+ /*
+ * NOTE: this driver keeps clocks off unless the
+ * USB host is present. That saves power, but for
+ * boards that don't support VBUS detection, both
+ * clocks need to be active most of the time.
+ */
+
+ /* host initiated suspend (3+ms bus idle) */
+ } else if (status & AT91_UDP_RXSUSP) {
+ at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
+ at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
+ at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
+ /* VDBG("bus suspend\n"); */
+ if (udc->suspended)
+ continue;
+ udc->suspended = 1;
+
+ /*
+ * NOTE: when suspending a VBUS-powered device, the
+ * gadget driver should switch into slow clock mode
+ * and then into standby to avoid drawing more than
+ * 500uA power (2500uA for some high-power configs).
+ */
+ if (udc->driver && udc->driver->suspend) {
+ spin_unlock(&udc->lock);
+ udc->driver->suspend(&udc->gadget);
+ spin_lock(&udc->lock);
+ }
+
+ /* host initiated resume */
+ } else if (status & AT91_UDP_RXRSM) {
+ at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
+ at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
+ at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
+ /* VDBG("bus resume\n"); */
+ if (!udc->suspended)
+ continue;
+ udc->suspended = 0;
+
+ /*
+ * NOTE: for a VBUS-powered device, the gadget driver
+ * would normally want to switch out of slow clock
+ * mode into normal mode.
+ */
+ if (udc->driver && udc->driver->resume) {
+ spin_unlock(&udc->lock);
+ udc->driver->resume(&udc->gadget);
+ spin_lock(&udc->lock);
+ }
+
+ /* endpoint IRQs are cleared by handling them */
+ } else {
+ int i;
+ unsigned mask = 1;
+ struct at91_ep *ep = &udc->ep[1];
+
+ if (status & mask)
+ handle_ep0(udc);
+ for (i = 1; i < NUM_ENDPOINTS; i++) {
+ mask <<= 1;
+ if (status & mask)
+ handle_ep(ep);
+ ep++;
+ }
+ }
+ }
+
+ if (disable_clock)
+ clk_off(udc);
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void at91_vbus_update(struct at91_udc *udc, unsigned value)
+{
+ value ^= udc->board.vbus_active_low;
+ if (value != udc->vbus)
+ at91_vbus_session(&udc->gadget, value);
+}
+
+static irqreturn_t at91_vbus_irq(int irq, void *_udc)
+{
+ struct at91_udc *udc = _udc;
+
+ /* vbus needs at least brief debouncing */
+ udelay(10);
+ at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
+
+ return IRQ_HANDLED;
+}
+
+static void at91_vbus_timer_work(struct work_struct *work)
+{
+ struct at91_udc *udc = container_of(work, struct at91_udc,
+ vbus_timer_work);
+
+ at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
+
+ if (!timer_pending(&udc->vbus_timer))
+ mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
+}
+
+static void at91_vbus_timer(unsigned long data)
+{
+ struct at91_udc *udc = (struct at91_udc *)data;
+
+ /*
+ * If we are polling vbus it is likely that the gpio is on an
+ * bus such as i2c or spi which may sleep, so schedule some work
+ * to read the vbus gpio
+ */
+ schedule_work(&udc->vbus_timer_work);
+}
+
+static int at91_start(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver)
+{
+ struct at91_udc *udc;
+
+ udc = container_of(gadget, struct at91_udc, gadget);
+ udc->driver = driver;
+ udc->gadget.dev.of_node = udc->pdev->dev.of_node;
+ udc->enabled = 1;
+ udc->gadget.is_selfpowered = 1;
+
+ return 0;
+}
+
+static int at91_stop(struct usb_gadget *gadget)
+{
+ struct at91_udc *udc;
+ unsigned long flags;
+
+ udc = container_of(gadget, struct at91_udc, gadget);
+ spin_lock_irqsave(&udc->lock, flags);
+ udc->enabled = 0;
+ at91_udp_write(udc, AT91_UDP_IDR, ~0);
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ udc->driver = NULL;
+
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void at91udc_shutdown(struct platform_device *dev)
+{
+ struct at91_udc *udc = platform_get_drvdata(dev);
+ unsigned long flags;
+
+ /* force disconnect on reboot */
+ spin_lock_irqsave(&udc->lock, flags);
+ pullup(platform_get_drvdata(dev), 0);
+ spin_unlock_irqrestore(&udc->lock, flags);
+}
+
+static int at91rm9200_udc_init(struct at91_udc *udc)
+{
+ struct at91_ep *ep;
+ int ret;
+ int i;
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+
+ switch (i) {
+ case 0:
+ case 3:
+ ep->maxpacket = 8;
+ break;
+ case 1 ... 2:
+ ep->maxpacket = 64;
+ break;
+ case 4 ... 5:
+ ep->maxpacket = 256;
+ break;
+ }
+ }
+
+ if (!gpio_is_valid(udc->board.pullup_pin)) {
+ DBG("no D+ pullup?\n");
+ return -ENODEV;
+ }
+
+ ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin,
+ "udc_pullup");
+ if (ret) {
+ DBG("D+ pullup is busy\n");
+ return ret;
+ }
+
+ gpio_direction_output(udc->board.pullup_pin,
+ udc->board.pullup_active_low);
+
+ return 0;
+}
+
+static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on)
+{
+ int active = !udc->board.pullup_active_low;
+
+ if (is_on)
+ gpio_set_value(udc->board.pullup_pin, active);
+ else
+ gpio_set_value(udc->board.pullup_pin, !active);
+}
+
+static const struct at91_udc_caps at91rm9200_udc_caps = {
+ .init = at91rm9200_udc_init,
+ .pullup = at91rm9200_udc_pullup,
+};
+
+static int at91sam9260_udc_init(struct at91_udc *udc)
+{
+ struct at91_ep *ep;
+ int i;
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+
+ switch (i) {
+ case 0 ... 3:
+ ep->maxpacket = 64;
+ break;
+ case 4 ... 5:
+ ep->maxpacket = 512;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
+{
+ u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
+
+ if (is_on)
+ txvc |= AT91_UDP_TXVC_PUON;
+ else
+ txvc &= ~AT91_UDP_TXVC_PUON;
+
+ at91_udp_write(udc, AT91_UDP_TXVC, txvc);
+}
+
+static const struct at91_udc_caps at91sam9260_udc_caps = {
+ .init = at91sam9260_udc_init,
+ .pullup = at91sam9260_udc_pullup,
+};
+
+static int at91sam9261_udc_init(struct at91_udc *udc)
+{
+ struct at91_ep *ep;
+ int i;
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+
+ switch (i) {
+ case 0:
+ ep->maxpacket = 8;
+ break;
+ case 1 ... 3:
+ ep->maxpacket = 64;
+ break;
+ case 4 ... 5:
+ ep->maxpacket = 256;
+ break;
+ }
+ }
+
+ udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node,
+ "atmel,matrix");
+ if (IS_ERR(udc->matrix))
+ return PTR_ERR(udc->matrix);
+
+ return 0;
+}
+
+static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
+{
+ u32 usbpucr = 0;
+
+ if (is_on)
+ usbpucr = AT91_MATRIX_USBPUCR_PUON;
+
+ regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR,
+ AT91_MATRIX_USBPUCR_PUON, usbpucr);
+}
+
+static const struct at91_udc_caps at91sam9261_udc_caps = {
+ .init = at91sam9261_udc_init,
+ .pullup = at91sam9261_udc_pullup,
+};
+
+static int at91sam9263_udc_init(struct at91_udc *udc)
+{
+ struct at91_ep *ep;
+ int i;
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+
+ switch (i) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ ep->maxpacket = 64;
+ break;
+ case 4:
+ case 5:
+ ep->maxpacket = 256;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static const struct at91_udc_caps at91sam9263_udc_caps = {
+ .init = at91sam9263_udc_init,
+ .pullup = at91sam9260_udc_pullup,
+};
+
+static const struct of_device_id at91_udc_dt_ids[] = {
+ {
+ .compatible = "atmel,at91rm9200-udc",
+ .data = &at91rm9200_udc_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9260-udc",
+ .data = &at91sam9260_udc_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9261-udc",
+ .data = &at91sam9261_udc_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9263-udc",
+ .data = &at91sam9263_udc_caps,
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
+
+static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
+{
+ struct at91_udc_data *board = &udc->board;
+ const struct of_device_id *match;
+ enum of_gpio_flags flags;
+ u32 val;
+
+ if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
+ board->vbus_polled = 1;
+
+ board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
+ &flags);
+ board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
+
+ board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
+ &flags);
+
+ board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
+
+ match = of_match_node(at91_udc_dt_ids, np);
+ if (match)
+ udc->caps = match->data;
+}
+
+static int at91udc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct at91_udc *udc;
+ int retval;
+ struct resource *res;
+ struct at91_ep *ep;
+ int i;
+
+ udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
+ if (!udc)
+ return -ENOMEM;
+
+ /* init software state */
+ udc->gadget.dev.parent = dev;
+ at91udc_of_init(udc, pdev->dev.of_node);
+ udc->pdev = pdev;
+ udc->enabled = 0;
+ spin_lock_init(&udc->lock);
+
+ udc->gadget.ops = &at91_udc_ops;
+ udc->gadget.ep0 = &udc->ep[0].ep;
+ udc->gadget.name = driver_name;
+ udc->gadget.dev.init_name = "gadget";
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+ ep->ep.name = ep_names[i];
+ ep->ep.ops = &at91_ep_ops;
+ ep->udc = udc;
+ ep->int_mask = BIT(i);
+ if (i != 0 && i != 3)
+ ep->is_pingpong = 1;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ udc->udp_baseaddr = devm_ioremap_resource(dev, res);
+ if (IS_ERR(udc->udp_baseaddr))
+ return PTR_ERR(udc->udp_baseaddr);
+
+ if (udc->caps && udc->caps->init) {
+ retval = udc->caps->init(udc);
+ if (retval)
+ return retval;
+ }
+
+ udc_reinit(udc);
+
+ /* get interface and function clocks */
+ udc->iclk = devm_clk_get(dev, "pclk");
+ if (IS_ERR(udc->iclk))
+ return PTR_ERR(udc->iclk);
+
+ udc->fclk = devm_clk_get(dev, "hclk");
+ if (IS_ERR(udc->fclk))
+ return PTR_ERR(udc->fclk);
+
+ /* don't do anything until we have both gadget driver and VBUS */
+ clk_set_rate(udc->fclk, 48000000);
+ retval = clk_prepare(udc->fclk);
+ if (retval)
+ return retval;
+
+ retval = clk_prepare_enable(udc->iclk);
+ if (retval)
+ goto err_unprepare_fclk;
+
+ at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
+ at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
+ /* Clear all pending interrupts - UDP may be used by bootloader. */
+ at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
+ clk_disable(udc->iclk);
+
+ /* request UDC and maybe VBUS irqs */
+ udc->udp_irq = platform_get_irq(pdev, 0);
+ retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
+ driver_name, udc);
+ if (retval) {
+ DBG("request irq %d failed\n", udc->udp_irq);
+ goto err_unprepare_iclk;
+ }
+
+ if (gpio_is_valid(udc->board.vbus_pin)) {
+ retval = devm_gpio_request(dev, udc->board.vbus_pin,
+ "udc_vbus");
+ if (retval) {
+ DBG("request vbus pin failed\n");
+ goto err_unprepare_iclk;
+ }
+
+ gpio_direction_input(udc->board.vbus_pin);
+
+ /*
+ * Get the initial state of VBUS - we cannot expect
+ * a pending interrupt.
+ */
+ udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
+ udc->board.vbus_active_low;
+
+ if (udc->board.vbus_polled) {
+ INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
+ setup_timer(&udc->vbus_timer, at91_vbus_timer,
+ (unsigned long)udc);
+ mod_timer(&udc->vbus_timer,
+ jiffies + VBUS_POLL_TIMEOUT);
+ } else {
+ retval = devm_request_irq(dev,
+ gpio_to_irq(udc->board.vbus_pin),
+ at91_vbus_irq, 0, driver_name, udc);
+ if (retval) {
+ DBG("request vbus irq %d failed\n",
+ udc->board.vbus_pin);
+ goto err_unprepare_iclk;
+ }
+ }
+ } else {
+ DBG("no VBUS detection, assuming always-on\n");
+ udc->vbus = 1;
+ }
+ retval = usb_add_gadget_udc(dev, &udc->gadget);
+ if (retval)
+ goto err_unprepare_iclk;
+ dev_set_drvdata(dev, udc);
+ device_init_wakeup(dev, 1);
+ create_debug_file(udc);
+
+ INFO("%s version %s\n", driver_name, DRIVER_VERSION);
+ return 0;
+
+err_unprepare_iclk:
+ clk_unprepare(udc->iclk);
+err_unprepare_fclk:
+ clk_unprepare(udc->fclk);
+
+ DBG("%s probe failed, %d\n", driver_name, retval);
+
+ return retval;
+}
+
+static int at91udc_remove(struct platform_device *pdev)
+{
+ struct at91_udc *udc = platform_get_drvdata(pdev);
+ unsigned long flags;
+
+ DBG("remove\n");
+
+ usb_del_gadget_udc(&udc->gadget);
+ if (udc->driver)
+ return -EBUSY;
+
+ spin_lock_irqsave(&udc->lock, flags);
+ pullup(udc, 0);
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ device_init_wakeup(&pdev->dev, 0);
+ remove_debug_file(udc);
+ clk_unprepare(udc->fclk);
+ clk_unprepare(udc->iclk);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+ struct at91_udc *udc = platform_get_drvdata(pdev);
+ int wake = udc->driver && device_may_wakeup(&pdev->dev);
+ unsigned long flags;
+
+ /* Unless we can act normally to the host (letting it wake us up
+ * whenever it has work for us) force disconnect. Wakeup requires
+ * PLLB for USB events (signaling for reset, wakeup, or incoming
+ * tokens) and VBUS irqs (on systems which support them).
+ */
+ if ((!udc->suspended && udc->addr)
+ || !wake
+ || at91_suspend_entering_slow_clock()) {
+ spin_lock_irqsave(&udc->lock, flags);
+ pullup(udc, 0);
+ wake = 0;
+ spin_unlock_irqrestore(&udc->lock, flags);
+ } else
+ enable_irq_wake(udc->udp_irq);
+
+ udc->active_suspend = wake;
+ if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
+ enable_irq_wake(udc->board.vbus_pin);
+ return 0;
+}
+
+static int at91udc_resume(struct platform_device *pdev)
+{
+ struct at91_udc *udc = platform_get_drvdata(pdev);
+ unsigned long flags;
+
+ if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
+ udc->active_suspend)
+ disable_irq_wake(udc->board.vbus_pin);
+
+ /* maybe reconnect to host; if so, clocks on */
+ if (udc->active_suspend)
+ disable_irq_wake(udc->udp_irq);
+ else {
+ spin_lock_irqsave(&udc->lock, flags);
+ pullup(udc, 1);
+ spin_unlock_irqrestore(&udc->lock, flags);
+ }
+ return 0;
+}
+#else
+#define at91udc_suspend NULL
+#define at91udc_resume NULL
+#endif
+
+static struct platform_driver at91_udc_driver = {
+ .remove = at91udc_remove,
+ .shutdown = at91udc_shutdown,
+ .suspend = at91udc_suspend,
+ .resume = at91udc_resume,
+ .driver = {
+ .name = (char *) driver_name,
+ .of_match_table = at91_udc_dt_ids,
+ },
+};
+
+module_platform_driver_probe(at91_udc_driver, at91udc_probe);
+
+MODULE_DESCRIPTION("AT91 udc driver");
+MODULE_AUTHOR("Thomas Rathbone, David Brownell");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:at91_udc");
projects / u-boot / commitdiff