2 * at91_udc -- driver for at91-series USB peripheral controller
4 * Copyright (C) 2004 by Thomas Rathbone
5 * Copyright (C) 2005 by HP Labs
6 * Copyright (C) 2005 by David Brownell
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/platform_device.h>
31 #include <linux/delay.h>
32 #include <linux/ioport.h>
33 #include <linux/sched.h>
34 #include <linux/slab.h>
35 #include <linux/smp_lock.h>
36 #include <linux/errno.h>
37 #include <linux/init.h>
38 #include <linux/list.h>
39 #include <linux/interrupt.h>
40 #include <linux/proc_fs.h>
41 #include <linux/clk.h>
42 #include <linux/usb_ch9.h>
43 #include <linux/usb_gadget.h>
45 #include <asm/byteorder.h>
46 #include <asm/hardware.h>
49 #include <asm/system.h>
50 #include <asm/mach-types.h>
52 #include <asm/arch/gpio.h>
53 #include <asm/arch/board.h>
59 * This controller is simple and PIO-only. It's used in many AT91-series
60 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
61 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
63 * This driver expects the board has been wired with two GPIOs suppporting
64 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
65 * testing hasn't covered such cases.)
67 * The pullup is most important (so it's integrated on sam926x parts). It
68 * provides software control over whether the host enumerates the device.
70 * The VBUS sensing helps during enumeration, and allows both USB clocks
71 * (and the transceiver) to stay gated off until they're necessary, saving
72 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
73 * it may also be gated off by software during some Linux sleep states.
76 #define DRIVER_VERSION "3 May 2006"
78 static const char driver_name [] = "at91_udc";
79 static const char ep0name[] = "ep0";
82 #define at91_udp_read(dev, reg) \
83 __raw_readl((dev)->udp_baseaddr + (reg))
84 #define at91_udp_write(dev, reg, val) \
85 __raw_writel((val), (dev)->udp_baseaddr + (reg))
87 /*-------------------------------------------------------------------------*/
89 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
91 #include <linux/seq_file.h>
93 static const char debug_filename[] = "driver/udc";
95 #define FOURBITS "%s%s%s%s"
96 #define EIGHTBITS FOURBITS FOURBITS
98 static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
100 static char *types[] = {
101 "control", "out-iso", "out-bulk", "out-int",
102 "BOGUS", "in-iso", "in-bulk", "in-int"};
105 struct at91_request *req;
108 local_irq_save(flags);
110 csr = __raw_readl(ep->creg);
112 /* NOTE: not collecting per-endpoint irq statistics... */
115 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
116 ep->ep.name, ep->ep.maxpacket,
117 ep->is_in ? "in" : "out",
118 ep->is_iso ? " iso" : "",
120 ? (ep->fifo_bank ? "pong" : "ping")
122 ep->stopped ? " stopped" : "");
123 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
125 (csr & 0x07ff0000) >> 16,
126 (csr & (1 << 15)) ? "enabled" : "disabled",
127 (csr & (1 << 11)) ? "DATA1" : "DATA0",
128 types[(csr & 0x700) >> 8],
130 /* iff type is control then print current direction */
132 ? ((csr & (1 << 7)) ? " IN" : " OUT")
134 (csr & (1 << 6)) ? " rxdatabk1" : "",
135 (csr & (1 << 5)) ? " forcestall" : "",
136 (csr & (1 << 4)) ? " txpktrdy" : "",
138 (csr & (1 << 3)) ? " stallsent" : "",
139 (csr & (1 << 2)) ? " rxsetup" : "",
140 (csr & (1 << 1)) ? " rxdatabk0" : "",
141 (csr & (1 << 0)) ? " txcomp" : "");
142 if (list_empty (&ep->queue))
143 seq_printf(s, "\t(queue empty)\n");
145 else list_for_each_entry (req, &ep->queue, queue) {
146 unsigned length = req->req.actual;
148 seq_printf(s, "\treq %p len %d/%d buf %p\n",
150 req->req.length, req->req.buf);
152 local_irq_restore(flags);
155 static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
159 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
160 (mask & (1 << 13)) ? " wakeup" : "",
161 (mask & (1 << 12)) ? " endbusres" : "",
163 (mask & (1 << 11)) ? " sofint" : "",
164 (mask & (1 << 10)) ? " extrsm" : "",
165 (mask & (1 << 9)) ? " rxrsm" : "",
166 (mask & (1 << 8)) ? " rxsusp" : "");
167 for (i = 0; i < 8; i++) {
169 seq_printf(s, " ep%d", i);
174 static int proc_udc_show(struct seq_file *s, void *unused)
176 struct at91_udc *udc = s->private;
180 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
182 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
183 udc->vbus ? "present" : "off",
185 ? (udc->vbus ? "active" : "enabled")
187 udc->selfpowered ? "self" : "VBUS",
188 udc->suspended ? ", suspended" : "",
189 udc->driver ? udc->driver->driver.name : "(none)");
191 /* don't access registers when interface isn't clocked */
193 seq_printf(s, "(not clocked)\n");
197 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
198 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
199 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
200 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
201 (tmp & AT91_UDP_NUM));
203 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
204 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
205 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
206 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
207 (tmp & AT91_UDP_ESR) ? " esr" : "",
208 (tmp & AT91_UDP_CONFG) ? " confg" : "",
209 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
211 tmp = at91_udp_read(udc, AT91_UDP_FADDR);
212 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
213 (tmp & AT91_UDP_FEN) ? " fen" : "",
214 (tmp & AT91_UDP_FADD));
216 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
217 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
219 if (udc->enabled && udc->vbus) {
220 proc_ep_show(s, &udc->ep[0]);
221 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
229 static int proc_udc_open(struct inode *inode, struct file *file)
231 return single_open(file, proc_udc_show, PDE(inode)->data);
234 static const struct file_operations proc_ops = {
235 .open = proc_udc_open,
238 .release = single_release,
241 static void create_debug_file(struct at91_udc *udc)
243 struct proc_dir_entry *pde;
245 pde = create_proc_entry (debug_filename, 0, NULL);
250 pde->proc_fops = &proc_ops;
254 static void remove_debug_file(struct at91_udc *udc)
257 remove_proc_entry(debug_filename, NULL);
262 static inline void create_debug_file(struct at91_udc *udc) {}
263 static inline void remove_debug_file(struct at91_udc *udc) {}
268 /*-------------------------------------------------------------------------*/
270 static void done(struct at91_ep *ep, struct at91_request *req, int status)
272 unsigned stopped = ep->stopped;
273 struct at91_udc *udc = ep->udc;
275 list_del_init(&req->queue);
276 if (req->req.status == -EINPROGRESS)
277 req->req.status = status;
279 status = req->req.status;
280 if (status && status != -ESHUTDOWN)
281 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
284 req->req.complete(&ep->ep, &req->req);
285 ep->stopped = stopped;
287 /* ep0 is always ready; other endpoints need a non-empty queue */
288 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
289 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
292 /*-------------------------------------------------------------------------*/
294 /* bits indicating OUT fifo has data ready */
295 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
298 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
299 * back most of the value you just read (because of side effects, including
300 * bits that may change after reading and before writing).
302 * Except when changing a specific bit, always write values which:
303 * - clear SET_FX bits (setting them could change something)
304 * - set CLR_FX bits (clearing them could change something)
306 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
307 * that shouldn't normally be changed.
309 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
310 * implying a need to wait for one write to complete (test relevant bits)
311 * before starting the next write. This shouldn't be an issue given how
312 * infrequently we write, except maybe for write-then-read idioms.
314 #define SET_FX (AT91_UDP_TXPKTRDY)
315 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
316 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
318 /* pull OUT packet data from the endpoint's fifo */
319 static int read_fifo (struct at91_ep *ep, struct at91_request *req)
321 u32 __iomem *creg = ep->creg;
322 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
325 unsigned int count, bufferspace, is_done;
327 buf = req->req.buf + req->req.actual;
328 bufferspace = req->req.length - req->req.actual;
331 * there might be nothing to read if ep_queue() calls us,
332 * or if we already emptied both pingpong buffers
335 csr = __raw_readl(creg);
336 if ((csr & RX_DATA_READY) == 0)
339 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
340 if (count > ep->ep.maxpacket)
341 count = ep->ep.maxpacket;
342 if (count > bufferspace) {
343 DBG("%s buffer overflow\n", ep->ep.name);
344 req->req.status = -EOVERFLOW;
347 __raw_readsb(dreg, buf, count);
349 /* release and swap pingpong mem bank */
351 if (ep->is_pingpong) {
352 if (ep->fifo_bank == 0) {
353 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
356 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
360 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
361 __raw_writel(csr, creg);
363 req->req.actual += count;
364 is_done = (count < ep->ep.maxpacket);
365 if (count == bufferspace)
368 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
369 is_done ? " (done)" : "");
372 * avoid extra trips through IRQ logic for packets already in
373 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
377 else if (ep->is_pingpong) {
378 bufferspace -= count;
386 /* load fifo for an IN packet */
387 static int write_fifo(struct at91_ep *ep, struct at91_request *req)
389 u32 __iomem *creg = ep->creg;
390 u32 csr = __raw_readl(creg);
391 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
392 unsigned total, count, is_last;
395 * TODO: allow for writing two packets to the fifo ... that'll
396 * reduce the amount of IN-NAKing, but probably won't affect
397 * throughput much. (Unlike preventing OUT-NAKing!)
401 * If ep_queue() calls us, the queue is empty and possibly in
402 * odd states like TXCOMP not yet cleared (we do it, saving at
403 * least one IRQ) or the fifo not yet being free. Those aren't
404 * issues normally (IRQ handler fast path).
406 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
407 if (csr & AT91_UDP_TXCOMP) {
409 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
410 __raw_writel(csr, creg);
411 csr = __raw_readl(creg);
413 if (csr & AT91_UDP_TXPKTRDY)
417 total = req->req.length - req->req.actual;
418 if (ep->ep.maxpacket < total) {
419 count = ep->ep.maxpacket;
423 is_last = (count < ep->ep.maxpacket) || !req->req.zero;
427 * Write the packet, maybe it's a ZLP.
429 * NOTE: incrementing req->actual before we receive the ACK means
430 * gadget driver IN bytecounts can be wrong in fault cases. That's
431 * fixable with PIO drivers like this one (save "count" here, and
432 * do the increment later on TX irq), but not for most DMA hardware.
434 * So all gadget drivers must accept that potential error. Some
435 * hardware supports precise fifo status reporting, letting them
436 * recover when the actual bytecount matters (e.g. for USB Test
437 * and Measurement Class devices).
439 __raw_writesb(dreg, req->req.buf + req->req.actual, count);
441 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
442 __raw_writel(csr, creg);
443 req->req.actual += count;
445 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
446 is_last ? " (done)" : "");
452 static void nuke(struct at91_ep *ep, int status)
454 struct at91_request *req;
456 // terminer chaque requete dans la queue
458 if (list_empty(&ep->queue))
461 VDBG("%s %s\n", __FUNCTION__, ep->ep.name);
462 while (!list_empty(&ep->queue)) {
463 req = list_entry(ep->queue.next, struct at91_request, queue);
464 done(ep, req, status);
468 /*-------------------------------------------------------------------------*/
470 static int at91_ep_enable(struct usb_ep *_ep,
471 const struct usb_endpoint_descriptor *desc)
473 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
474 struct at91_udc *dev = ep->udc;
481 || _ep->name == ep0name
482 || desc->bDescriptorType != USB_DT_ENDPOINT
483 || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0
484 || maxpacket > ep->maxpacket) {
485 DBG("bad ep or descriptor\n");
489 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
490 DBG("bogus device state\n");
494 tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
496 case USB_ENDPOINT_XFER_CONTROL:
497 DBG("only one control endpoint\n");
499 case USB_ENDPOINT_XFER_INT:
503 case USB_ENDPOINT_XFER_BULK:
512 DBG("bogus maxpacket %d\n", maxpacket);
514 case USB_ENDPOINT_XFER_ISOC:
515 if (!ep->is_pingpong) {
516 DBG("iso requires double buffering\n");
523 local_irq_save(flags);
525 /* initialize endpoint to match this descriptor */
526 ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
527 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
532 tmp |= AT91_UDP_EPEDS;
533 __raw_writel(tmp, ep->creg);
536 ep->ep.maxpacket = maxpacket;
539 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
540 * since endpoint resets don't reset hw pingpong state.
542 at91_udp_write(dev, AT91_UDP_RST_EP, ep->int_mask);
543 at91_udp_write(dev, AT91_UDP_RST_EP, 0);
545 local_irq_restore(flags);
549 static int at91_ep_disable (struct usb_ep * _ep)
551 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
552 struct at91_udc *udc = ep->udc;
555 if (ep == &ep->udc->ep[0])
558 local_irq_save(flags);
560 nuke(ep, -ESHUTDOWN);
562 /* restore the endpoint's pristine config */
564 ep->ep.maxpacket = ep->maxpacket;
566 /* reset fifos and endpoint */
567 if (ep->udc->clocked) {
568 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
569 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
570 __raw_writel(0, ep->creg);
573 local_irq_restore(flags);
578 * this is a PIO-only driver, so there's nothing
579 * interesting for request or buffer allocation.
582 static struct usb_request *
583 at91_ep_alloc_request(struct usb_ep *_ep, unsigned int gfp_flags)
585 struct at91_request *req;
587 req = kzalloc(sizeof (struct at91_request), gfp_flags);
591 INIT_LIST_HEAD(&req->queue);
595 static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
597 struct at91_request *req;
599 req = container_of(_req, struct at91_request, req);
600 BUG_ON(!list_empty(&req->queue));
604 static void *at91_ep_alloc_buffer(
611 return kmalloc(bytes, gfp_flags);
614 static void at91_ep_free_buffer(
623 static int at91_ep_queue(struct usb_ep *_ep,
624 struct usb_request *_req, gfp_t gfp_flags)
626 struct at91_request *req;
628 struct at91_udc *dev;
632 req = container_of(_req, struct at91_request, req);
633 ep = container_of(_ep, struct at91_ep, ep);
635 if (!_req || !_req->complete
636 || !_req->buf || !list_empty(&req->queue)) {
637 DBG("invalid request\n");
641 if (!_ep || (!ep->desc && ep->ep.name != ep0name)) {
648 if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
649 DBG("invalid device\n");
653 _req->status = -EINPROGRESS;
656 local_irq_save(flags);
658 /* try to kickstart any empty and idle queue */
659 if (list_empty(&ep->queue) && !ep->stopped) {
663 * If this control request has a non-empty DATA stage, this
664 * will start that stage. It works just like a non-control
665 * request (until the status stage starts, maybe early).
667 * If the data stage is empty, then this starts a successful
668 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
670 is_ep0 = (ep->ep.name == ep0name);
674 if (!dev->req_pending) {
680 * defer changing CONFG until after the gadget driver
681 * reconfigures the endpoints.
683 if (dev->wait_for_config_ack) {
684 tmp = at91_udp_read(dev, AT91_UDP_GLB_STAT);
685 tmp ^= AT91_UDP_CONFG;
686 VDBG("toggle config\n");
687 at91_udp_write(dev, AT91_UDP_GLB_STAT, tmp);
689 if (req->req.length == 0) {
691 PACKET("ep0 in/status\n");
693 tmp = __raw_readl(ep->creg);
695 tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
696 __raw_writel(tmp, ep->creg);
697 dev->req_pending = 0;
703 status = write_fifo(ep, req);
705 status = read_fifo(ep, req);
707 /* IN/STATUS stage is otherwise triggered by irq */
708 if (status && is_ep0)
714 if (req && !status) {
715 list_add_tail (&req->queue, &ep->queue);
716 at91_udp_write(dev, AT91_UDP_IER, ep->int_mask);
719 local_irq_restore(flags);
720 return (status < 0) ? status : 0;
723 static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
726 struct at91_request *req;
728 ep = container_of(_ep, struct at91_ep, ep);
729 if (!_ep || ep->ep.name == ep0name)
732 /* make sure it's actually queued on this endpoint */
733 list_for_each_entry (req, &ep->queue, queue) {
734 if (&req->req == _req)
737 if (&req->req != _req)
740 done(ep, req, -ECONNRESET);
744 static int at91_ep_set_halt(struct usb_ep *_ep, int value)
746 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
747 struct at91_udc *udc = ep->udc;
753 if (!_ep || ep->is_iso || !ep->udc->clocked)
757 local_irq_save(flags);
759 csr = __raw_readl(creg);
762 * fail with still-busy IN endpoints, ensuring correct sequencing
763 * of data tx then stall. note that the fifo rx bytecount isn't
764 * completely accurate as a tx bytecount.
766 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
772 csr |= AT91_UDP_FORCESTALL;
773 VDBG("halt %s\n", ep->ep.name);
775 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
776 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
777 csr &= ~AT91_UDP_FORCESTALL;
779 __raw_writel(csr, creg);
782 local_irq_restore(flags);
786 static struct usb_ep_ops at91_ep_ops = {
787 .enable = at91_ep_enable,
788 .disable = at91_ep_disable,
789 .alloc_request = at91_ep_alloc_request,
790 .free_request = at91_ep_free_request,
791 .alloc_buffer = at91_ep_alloc_buffer,
792 .free_buffer = at91_ep_free_buffer,
793 .queue = at91_ep_queue,
794 .dequeue = at91_ep_dequeue,
795 .set_halt = at91_ep_set_halt,
796 // there's only imprecise fifo status reporting
799 /*-------------------------------------------------------------------------*/
801 static int at91_get_frame(struct usb_gadget *gadget)
803 struct at91_udc *udc = to_udc(gadget);
805 if (!to_udc(gadget)->clocked)
807 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
810 static int at91_wakeup(struct usb_gadget *gadget)
812 struct at91_udc *udc = to_udc(gadget);
814 int status = -EINVAL;
817 DBG("%s\n", __FUNCTION__ );
818 local_irq_save(flags);
820 if (!udc->clocked || !udc->suspended)
823 /* NOTE: some "early versions" handle ESR differently ... */
825 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
826 if (!(glbstate & AT91_UDP_ESR))
828 glbstate |= AT91_UDP_ESR;
829 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
832 local_irq_restore(flags);
836 /* reinit == restore inital software state */
837 static void udc_reinit(struct at91_udc *udc)
841 INIT_LIST_HEAD(&udc->gadget.ep_list);
842 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
844 for (i = 0; i < NUM_ENDPOINTS; i++) {
845 struct at91_ep *ep = &udc->ep[i];
848 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
852 ep->ep.maxpacket = ep->maxpacket;
853 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
854 // initialiser une queue par endpoint
855 INIT_LIST_HEAD(&ep->queue);
859 static void stop_activity(struct at91_udc *udc)
861 struct usb_gadget_driver *driver = udc->driver;
864 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
866 udc->gadget.speed = USB_SPEED_UNKNOWN;
869 for (i = 0; i < NUM_ENDPOINTS; i++) {
870 struct at91_ep *ep = &udc->ep[i];
872 nuke(ep, -ESHUTDOWN);
875 driver->disconnect(&udc->gadget);
880 static void clk_on(struct at91_udc *udc)
885 clk_enable(udc->iclk);
886 clk_enable(udc->fclk);
889 static void clk_off(struct at91_udc *udc)
894 udc->gadget.speed = USB_SPEED_UNKNOWN;
895 clk_disable(udc->fclk);
896 clk_disable(udc->iclk);
900 * activate/deactivate link with host; minimize power usage for
901 * inactive links by cutting clocks and transceiver power.
903 static void pullup(struct at91_udc *udc, int is_on)
905 if (!udc->enabled || !udc->vbus)
907 DBG("%sactive\n", is_on ? "" : "in");
911 at91_udp_write(udc, AT91_UDP_TXVC, 0);
912 at91_set_gpio_value(udc->board.pullup_pin, 1);
915 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
916 at91_set_gpio_value(udc->board.pullup_pin, 0);
921 /* vbus is here! turn everything on that's ready */
922 static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
924 struct at91_udc *udc = to_udc(gadget);
927 // VDBG("vbus %s\n", is_active ? "on" : "off");
928 local_irq_save(flags);
929 udc->vbus = (is_active != 0);
930 pullup(udc, is_active);
931 local_irq_restore(flags);
935 static int at91_pullup(struct usb_gadget *gadget, int is_on)
937 struct at91_udc *udc = to_udc(gadget);
940 local_irq_save(flags);
941 udc->enabled = is_on = !!is_on;
943 local_irq_restore(flags);
947 static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
949 struct at91_udc *udc = to_udc(gadget);
952 local_irq_save(flags);
953 udc->selfpowered = (is_on != 0);
954 local_irq_restore(flags);
958 static const struct usb_gadget_ops at91_udc_ops = {
959 .get_frame = at91_get_frame,
960 .wakeup = at91_wakeup,
961 .set_selfpowered = at91_set_selfpowered,
962 .vbus_session = at91_vbus_session,
963 .pullup = at91_pullup,
966 * VBUS-powered devices may also also want to support bigger
967 * power budgets after an appropriate SET_CONFIGURATION.
969 // .vbus_power = at91_vbus_power,
972 /*-------------------------------------------------------------------------*/
974 static int handle_ep(struct at91_ep *ep)
976 struct at91_request *req;
977 u32 __iomem *creg = ep->creg;
978 u32 csr = __raw_readl(creg);
980 if (!list_empty(&ep->queue))
981 req = list_entry(ep->queue.next,
982 struct at91_request, queue);
987 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
989 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
990 __raw_writel(csr, creg);
993 return write_fifo(ep, req);
996 if (csr & AT91_UDP_STALLSENT) {
997 /* STALLSENT bit == ISOERR */
998 if (ep->is_iso && req)
999 req->req.status = -EILSEQ;
1001 csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1002 __raw_writel(csr, creg);
1003 csr = __raw_readl(creg);
1005 if (req && (csr & RX_DATA_READY))
1006 return read_fifo(ep, req);
1013 struct usb_ctrlrequest r;
1016 static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1018 u32 __iomem *creg = ep->creg;
1019 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1020 unsigned rxcount, i = 0;
1025 /* read and ack SETUP; hard-fail for bogus packets */
1026 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1027 if (likely(rxcount == 8)) {
1029 pkt.raw[i++] = __raw_readb(dreg);
1030 if (pkt.r.bRequestType & USB_DIR_IN) {
1031 csr |= AT91_UDP_DIR;
1034 csr &= ~AT91_UDP_DIR;
1038 // REVISIT this happens sometimes under load; why??
1039 ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1043 csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1044 __raw_writel(csr, creg);
1045 udc->wait_for_addr_ack = 0;
1046 udc->wait_for_config_ack = 0;
1048 if (unlikely(status != 0))
1051 #define w_index le16_to_cpu(pkt.r.wIndex)
1052 #define w_value le16_to_cpu(pkt.r.wValue)
1053 #define w_length le16_to_cpu(pkt.r.wLength)
1055 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1056 pkt.r.bRequestType, pkt.r.bRequest,
1057 w_value, w_index, w_length);
1060 * A few standard requests get handled here, ones that touch
1061 * hardware ... notably for device and endpoint features.
1063 udc->req_pending = 1;
1064 csr = __raw_readl(creg);
1067 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1069 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1070 | USB_REQ_SET_ADDRESS:
1071 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1072 udc->addr = w_value;
1073 udc->wait_for_addr_ack = 1;
1074 udc->req_pending = 0;
1075 /* FADDR is set later, when we ack host STATUS */
1078 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1079 | USB_REQ_SET_CONFIGURATION:
1080 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1082 udc->wait_for_config_ack = (tmp == 0);
1084 udc->wait_for_config_ack = (tmp != 0);
1085 if (udc->wait_for_config_ack)
1086 VDBG("wait for config\n");
1087 /* CONFG is toggled later, if gadget driver succeeds */
1091 * Hosts may set or clear remote wakeup status, and
1092 * devices may report they're VBUS powered.
1094 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1095 | USB_REQ_GET_STATUS:
1096 tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
1097 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1098 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1099 PACKET("get device status\n");
1100 __raw_writeb(tmp, dreg);
1101 __raw_writeb(0, dreg);
1103 /* then STATUS starts later, automatically */
1104 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1105 | USB_REQ_SET_FEATURE:
1106 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1108 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1109 tmp |= AT91_UDP_ESR;
1110 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1112 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1113 | USB_REQ_CLEAR_FEATURE:
1114 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1116 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1117 tmp &= ~AT91_UDP_ESR;
1118 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1122 * Interfaces have no feature settings; this is pretty useless.
1123 * we won't even insist the interface exists...
1125 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1126 | USB_REQ_GET_STATUS:
1127 PACKET("get interface status\n");
1128 __raw_writeb(0, dreg);
1129 __raw_writeb(0, dreg);
1131 /* then STATUS starts later, automatically */
1132 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1133 | USB_REQ_SET_FEATURE:
1134 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1135 | USB_REQ_CLEAR_FEATURE:
1139 * Hosts may clear bulk/intr endpoint halt after the gadget
1140 * driver sets it (not widely used); or set it (for testing)
1142 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1143 | USB_REQ_GET_STATUS:
1144 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1146 if (tmp > NUM_ENDPOINTS || (tmp && !ep->desc))
1150 if ((w_index & USB_DIR_IN)) {
1153 } else if (ep->is_in)
1156 PACKET("get %s status\n", ep->ep.name);
1157 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1158 tmp = (1 << USB_ENDPOINT_HALT);
1161 __raw_writeb(tmp, dreg);
1162 __raw_writeb(0, dreg);
1164 /* then STATUS starts later, automatically */
1165 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1166 | USB_REQ_SET_FEATURE:
1167 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1169 if (w_value != USB_ENDPOINT_HALT || tmp > NUM_ENDPOINTS)
1171 if (!ep->desc || ep->is_iso)
1173 if ((w_index & USB_DIR_IN)) {
1176 } else if (ep->is_in)
1179 tmp = __raw_readl(ep->creg);
1181 tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1182 __raw_writel(tmp, ep->creg);
1184 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1185 | USB_REQ_CLEAR_FEATURE:
1186 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1188 if (w_value != USB_ENDPOINT_HALT || tmp > NUM_ENDPOINTS)
1192 if (!ep->desc || ep->is_iso)
1194 if ((w_index & USB_DIR_IN)) {
1197 } else if (ep->is_in)
1200 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1201 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1202 tmp = __raw_readl(ep->creg);
1204 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1205 __raw_writel(tmp, ep->creg);
1206 if (!list_empty(&ep->queue))
1215 /* pass request up to the gadget driver */
1216 status = udc->driver->setup(&udc->gadget, &pkt.r);
1219 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1220 pkt.r.bRequestType, pkt.r.bRequest, status);
1221 csr |= AT91_UDP_FORCESTALL;
1222 __raw_writel(csr, creg);
1223 udc->req_pending = 0;
1228 /* immediate successful (IN) STATUS after zero length DATA */
1229 PACKET("ep0 in/status\n");
1231 csr |= AT91_UDP_TXPKTRDY;
1232 __raw_writel(csr, creg);
1233 udc->req_pending = 0;
1237 static void handle_ep0(struct at91_udc *udc)
1239 struct at91_ep *ep0 = &udc->ep[0];
1240 u32 __iomem *creg = ep0->creg;
1241 u32 csr = __raw_readl(creg);
1242 struct at91_request *req;
1244 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1246 udc->req_pending = 0;
1248 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1249 __raw_writel(csr, creg);
1250 VDBG("ep0 stalled\n");
1251 csr = __raw_readl(creg);
1253 if (csr & AT91_UDP_RXSETUP) {
1255 udc->req_pending = 0;
1256 handle_setup(udc, ep0, csr);
1260 if (list_empty(&ep0->queue))
1263 req = list_entry(ep0->queue.next, struct at91_request, queue);
1265 /* host ACKed an IN packet that we sent */
1266 if (csr & AT91_UDP_TXCOMP) {
1268 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1270 /* write more IN DATA? */
1271 if (req && ep0->is_in) {
1273 udc->req_pending = 0;
1277 * - last IN DATA packet (including GET_STATUS)
1278 * - IN/STATUS for OUT DATA
1279 * - IN/STATUS for any zero-length DATA stage
1280 * except for the IN DATA case, the host should send
1281 * an OUT status later, which we'll ack.
1284 udc->req_pending = 0;
1285 __raw_writel(csr, creg);
1288 * SET_ADDRESS takes effect only after the STATUS
1289 * (to the original address) gets acked.
1291 if (udc->wait_for_addr_ack) {
1294 at91_udp_write(udc, AT91_UDP_FADDR,
1295 AT91_UDP_FEN | udc->addr);
1296 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1297 tmp &= ~AT91_UDP_FADDEN;
1299 tmp |= AT91_UDP_FADDEN;
1300 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1302 udc->wait_for_addr_ack = 0;
1303 VDBG("address %d\n", udc->addr);
1308 /* OUT packet arrived ... */
1309 else if (csr & AT91_UDP_RX_DATA_BK0) {
1311 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1313 /* OUT DATA stage */
1316 if (handle_ep(ep0)) {
1317 /* send IN/STATUS */
1318 PACKET("ep0 in/status\n");
1319 csr = __raw_readl(creg);
1321 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1322 __raw_writel(csr, creg);
1323 udc->req_pending = 0;
1325 } else if (udc->req_pending) {
1327 * AT91 hardware has a hard time with this
1328 * "deferred response" mode for control-OUT
1329 * transfers. (For control-IN it's fine.)
1331 * The normal solution leaves OUT data in the
1332 * fifo until the gadget driver is ready.
1333 * We couldn't do that here without disabling
1334 * the IRQ that tells about SETUP packets,
1335 * e.g. when the host gets impatient...
1337 * Working around it by copying into a buffer
1338 * would almost be a non-deferred response,
1339 * except that it wouldn't permit reliable
1340 * stalling of the request. Instead, demand
1341 * that gadget drivers not use this mode.
1343 DBG("no control-OUT deferred responses!\n");
1344 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1345 udc->req_pending = 0;
1348 /* STATUS stage for control-IN; ack. */
1350 PACKET("ep0 out/status ACK\n");
1351 __raw_writel(csr, creg);
1353 /* "early" status stage */
1360 static irqreturn_t at91_udc_irq (int irq, void *_udc)
1362 struct at91_udc *udc = _udc;
1368 status = at91_udp_read(udc, AT91_UDP_ISR)
1369 & at91_udp_read(udc, AT91_UDP_IMR);
1373 /* USB reset irq: not maskable */
1374 if (status & AT91_UDP_ENDBUSRES) {
1375 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1376 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1377 /* Atmel code clears this irq twice */
1378 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1379 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1380 VDBG("end bus reset\n");
1385 at91_udp_write(udc, AT91_UDP_CSR(0),
1386 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1387 udc->gadget.speed = USB_SPEED_FULL;
1389 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1392 * NOTE: this driver keeps clocks off unless the
1393 * USB host is present. That saves power, but for
1394 * boards that don't support VBUS detection, both
1395 * clocks need to be active most of the time.
1398 /* host initiated suspend (3+ms bus idle) */
1399 } else if (status & AT91_UDP_RXSUSP) {
1400 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1401 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1402 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1403 // VDBG("bus suspend\n");
1409 * NOTE: when suspending a VBUS-powered device, the
1410 * gadget driver should switch into slow clock mode
1411 * and then into standby to avoid drawing more than
1412 * 500uA power (2500uA for some high-power configs).
1414 if (udc->driver && udc->driver->suspend)
1415 udc->driver->suspend(&udc->gadget);
1417 /* host initiated resume */
1418 } else if (status & AT91_UDP_RXRSM) {
1419 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1420 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1421 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1422 // VDBG("bus resume\n");
1423 if (!udc->suspended)
1428 * NOTE: for a VBUS-powered device, the gadget driver
1429 * would normally want to switch out of slow clock
1430 * mode into normal mode.
1432 if (udc->driver && udc->driver->resume)
1433 udc->driver->resume(&udc->gadget);
1435 /* endpoint IRQs are cleared by handling them */
1439 struct at91_ep *ep = &udc->ep[1];
1443 for (i = 1; i < NUM_ENDPOINTS; i++) {
1455 /*-------------------------------------------------------------------------*/
1457 static void nop_release(struct device *dev)
1459 /* nothing to free */
1462 static struct at91_udc controller = {
1464 .ops = &at91_udc_ops,
1465 .ep0 = &controller.ep[0].ep,
1466 .name = driver_name,
1469 .release = nop_release,
1475 .ops = &at91_ep_ops,
1484 .ops = &at91_ep_ops,
1494 .ops = &at91_ep_ops,
1503 /* could actually do bulk too */
1505 .ops = &at91_ep_ops,
1514 .ops = &at91_ep_ops,
1524 .ops = &at91_ep_ops,
1531 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1534 static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1536 struct at91_udc *udc = _udc;
1539 /* vbus needs at least brief debouncing */
1541 value = at91_get_gpio_value(udc->board.vbus_pin);
1542 if (value != udc->vbus)
1543 at91_vbus_session(&udc->gadget, value);
1548 int usb_gadget_register_driver (struct usb_gadget_driver *driver)
1550 struct at91_udc *udc = &controller;
1554 || driver->speed != USB_SPEED_FULL
1556 || !driver->setup) {
1557 DBG("bad parameter.\n");
1562 DBG("UDC already has a gadget driver\n");
1566 udc->driver = driver;
1567 udc->gadget.dev.driver = &driver->driver;
1568 udc->gadget.dev.driver_data = &driver->driver;
1570 udc->selfpowered = 1;
1572 retval = driver->bind(&udc->gadget);
1574 DBG("driver->bind() returned %d\n", retval);
1579 local_irq_disable();
1583 DBG("bound to %s\n", driver->driver.name);
1586 EXPORT_SYMBOL (usb_gadget_register_driver);
1588 int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
1590 struct at91_udc *udc = &controller;
1592 if (!driver || driver != udc->driver || !driver->unbind)
1595 local_irq_disable();
1597 at91_udp_write(udc, AT91_UDP_IDR, ~0);
1601 driver->unbind(&udc->gadget);
1604 DBG("unbound from %s\n", driver->driver.name);
1607 EXPORT_SYMBOL (usb_gadget_unregister_driver);
1609 /*-------------------------------------------------------------------------*/
1611 static void at91udc_shutdown(struct platform_device *dev)
1613 /* force disconnect on reboot */
1614 pullup(platform_get_drvdata(dev), 0);
1617 static int __devinit at91udc_probe(struct platform_device *pdev)
1619 struct device *dev = &pdev->dev;
1620 struct at91_udc *udc;
1622 struct resource *res;
1624 if (!dev->platform_data) {
1625 /* small (so we copy it) but critical! */
1626 DBG("missing platform_data\n");
1630 if (pdev->num_resources != 2) {
1631 DBG("invalid num_resources");
1634 if ((pdev->resource[0].flags != IORESOURCE_MEM)
1635 || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1636 DBG("invalid resource type");
1640 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1644 if (!request_mem_region(res->start,
1645 res->end - res->start + 1,
1647 DBG("someone's using UDC memory\n");
1651 /* init software state */
1653 udc->gadget.dev.parent = dev;
1654 udc->board = *(struct at91_udc_data *) dev->platform_data;
1658 udc->udp_baseaddr = ioremap(res->start, res->end - res->start + 1);
1659 if (!udc->udp_baseaddr) {
1660 release_mem_region(res->start, res->end - res->start + 1);
1666 /* get interface and function clocks */
1667 udc->iclk = clk_get(dev, "udc_clk");
1668 udc->fclk = clk_get(dev, "udpck");
1669 if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
1670 DBG("clocks missing\n");
1674 retval = device_register(&udc->gadget.dev);
1678 /* don't do anything until we have both gadget driver and VBUS */
1679 clk_enable(udc->iclk);
1680 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1681 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1682 clk_disable(udc->iclk);
1684 /* request UDC and maybe VBUS irqs */
1685 udc->udp_irq = platform_get_irq(pdev, 0);
1686 if (request_irq(udc->udp_irq, at91_udc_irq,
1687 IRQF_DISABLED, driver_name, udc)) {
1688 DBG("request irq %d failed\n", udc->udp_irq);
1692 if (udc->board.vbus_pin > 0) {
1693 if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
1694 IRQF_DISABLED, driver_name, udc)) {
1695 DBG("request vbus irq %d failed\n",
1696 udc->board.vbus_pin);
1697 free_irq(udc->udp_irq, udc);
1702 DBG("no VBUS detection, assuming always-on\n");
1705 dev_set_drvdata(dev, udc);
1706 device_init_wakeup(dev, 1);
1707 create_debug_file(udc);
1709 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1713 device_unregister(&udc->gadget.dev);
1715 release_mem_region(res->start, res->end - res->start + 1);
1716 DBG("%s probe failed, %d\n", driver_name, retval);
1720 static int __devexit at91udc_remove(struct platform_device *pdev)
1722 struct at91_udc *udc = platform_get_drvdata(pdev);
1723 struct resource *res;
1732 device_init_wakeup(&pdev->dev, 0);
1733 remove_debug_file(udc);
1734 if (udc->board.vbus_pin > 0)
1735 free_irq(udc->board.vbus_pin, udc);
1736 free_irq(udc->udp_irq, udc);
1737 device_unregister(&udc->gadget.dev);
1739 iounmap(udc->udp_baseaddr);
1740 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1741 release_mem_region(res->start, res->end - res->start + 1);
1750 static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1752 struct at91_udc *udc = platform_get_drvdata(pdev);
1753 int wake = udc->driver && device_may_wakeup(&pdev->dev);
1755 /* Unless we can act normally to the host (letting it wake us up
1756 * whenever it has work for us) force disconnect. Wakeup requires
1757 * PLLB for USB events (signaling for reset, wakeup, or incoming
1758 * tokens) and VBUS irqs (on systems which support them).
1760 if ((!udc->suspended && udc->addr)
1762 || at91_suspend_entering_slow_clock()) {
1764 disable_irq_wake(udc->udp_irq);
1766 enable_irq_wake(udc->udp_irq);
1768 if (udc->board.vbus_pin > 0) {
1770 enable_irq_wake(udc->board.vbus_pin);
1772 disable_irq_wake(udc->board.vbus_pin);
1777 static int at91udc_resume(struct platform_device *pdev)
1779 struct at91_udc *udc = platform_get_drvdata(pdev);
1781 /* maybe reconnect to host; if so, clocks on */
1786 #define at91udc_suspend NULL
1787 #define at91udc_resume NULL
1790 static struct platform_driver at91_udc = {
1791 .probe = at91udc_probe,
1792 .remove = __devexit_p(at91udc_remove),
1793 .shutdown = at91udc_shutdown,
1794 .suspend = at91udc_suspend,
1795 .resume = at91udc_resume,
1797 .name = (char *) driver_name,
1798 .owner = THIS_MODULE,
1802 static int __devinit udc_init_module(void)
1804 return platform_driver_register(&at91_udc);
1806 module_init(udc_init_module);
1808 static void __devexit udc_exit_module(void)
1810 platform_driver_unregister(&at91_udc);
1812 module_exit(udc_exit_module);
1814 MODULE_DESCRIPTION("AT91 udc driver");
1815 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
1816 MODULE_LICENSE("GPL");