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.
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/platform_device.h>
30 #include <linux/delay.h>
31 #include <linux/ioport.h>
32 #include <linux/slab.h>
33 #include <linux/errno.h>
34 #include <linux/init.h>
35 #include <linux/list.h>
36 #include <linux/interrupt.h>
37 #include <linux/proc_fs.h>
38 #include <linux/clk.h>
39 #include <linux/usb/ch9.h>
40 #include <linux/usb/gadget.h>
42 #include <asm/byteorder.h>
43 #include <mach/hardware.h>
46 #include <asm/system.h>
49 #include <mach/board.h>
51 #include <mach/at91sam9261_matrix.h>
57 * This controller is simple and PIO-only. It's used in many AT91-series
58 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
59 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
61 * This driver expects the board has been wired with two GPIOs suppporting
62 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
63 * testing hasn't covered such cases.)
65 * The pullup is most important (so it's integrated on sam926x parts). It
66 * provides software control over whether the host enumerates the device.
68 * The VBUS sensing helps during enumeration, and allows both USB clocks
69 * (and the transceiver) to stay gated off until they're necessary, saving
70 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
71 * it may also be gated off by software during some Linux sleep states.
74 #define DRIVER_VERSION "3 May 2006"
76 static const char driver_name [] = "at91_udc";
77 static const char ep0name[] = "ep0";
80 #define at91_udp_read(dev, reg) \
81 __raw_readl((dev)->udp_baseaddr + (reg))
82 #define at91_udp_write(dev, reg, val) \
83 __raw_writel((val), (dev)->udp_baseaddr + (reg))
85 /*-------------------------------------------------------------------------*/
87 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
89 #include <linux/seq_file.h>
91 static const char debug_filename[] = "driver/udc";
93 #define FOURBITS "%s%s%s%s"
94 #define EIGHTBITS FOURBITS FOURBITS
96 static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
98 static char *types[] = {
99 "control", "out-iso", "out-bulk", "out-int",
100 "BOGUS", "in-iso", "in-bulk", "in-int"};
103 struct at91_request *req;
106 local_irq_save(flags);
108 csr = __raw_readl(ep->creg);
110 /* NOTE: not collecting per-endpoint irq statistics... */
113 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
114 ep->ep.name, ep->ep.maxpacket,
115 ep->is_in ? "in" : "out",
116 ep->is_iso ? " iso" : "",
118 ? (ep->fifo_bank ? "pong" : "ping")
120 ep->stopped ? " stopped" : "");
121 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
123 (csr & 0x07ff0000) >> 16,
124 (csr & (1 << 15)) ? "enabled" : "disabled",
125 (csr & (1 << 11)) ? "DATA1" : "DATA0",
126 types[(csr & 0x700) >> 8],
128 /* iff type is control then print current direction */
130 ? ((csr & (1 << 7)) ? " IN" : " OUT")
132 (csr & (1 << 6)) ? " rxdatabk1" : "",
133 (csr & (1 << 5)) ? " forcestall" : "",
134 (csr & (1 << 4)) ? " txpktrdy" : "",
136 (csr & (1 << 3)) ? " stallsent" : "",
137 (csr & (1 << 2)) ? " rxsetup" : "",
138 (csr & (1 << 1)) ? " rxdatabk0" : "",
139 (csr & (1 << 0)) ? " txcomp" : "");
140 if (list_empty (&ep->queue))
141 seq_printf(s, "\t(queue empty)\n");
143 else list_for_each_entry (req, &ep->queue, queue) {
144 unsigned length = req->req.actual;
146 seq_printf(s, "\treq %p len %d/%d buf %p\n",
148 req->req.length, req->req.buf);
150 local_irq_restore(flags);
153 static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
157 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
158 (mask & (1 << 13)) ? " wakeup" : "",
159 (mask & (1 << 12)) ? " endbusres" : "",
161 (mask & (1 << 11)) ? " sofint" : "",
162 (mask & (1 << 10)) ? " extrsm" : "",
163 (mask & (1 << 9)) ? " rxrsm" : "",
164 (mask & (1 << 8)) ? " rxsusp" : "");
165 for (i = 0; i < 8; i++) {
167 seq_printf(s, " ep%d", i);
172 static int proc_udc_show(struct seq_file *s, void *unused)
174 struct at91_udc *udc = s->private;
178 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
180 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
181 udc->vbus ? "present" : "off",
183 ? (udc->vbus ? "active" : "enabled")
185 udc->selfpowered ? "self" : "VBUS",
186 udc->suspended ? ", suspended" : "",
187 udc->driver ? udc->driver->driver.name : "(none)");
189 /* don't access registers when interface isn't clocked */
191 seq_printf(s, "(not clocked)\n");
195 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
196 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
197 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
198 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
199 (tmp & AT91_UDP_NUM));
201 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
202 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
203 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
204 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
205 (tmp & AT91_UDP_ESR) ? " esr" : "",
206 (tmp & AT91_UDP_CONFG) ? " confg" : "",
207 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
209 tmp = at91_udp_read(udc, AT91_UDP_FADDR);
210 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
211 (tmp & AT91_UDP_FEN) ? " fen" : "",
212 (tmp & AT91_UDP_FADD));
214 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
215 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
217 if (udc->enabled && udc->vbus) {
218 proc_ep_show(s, &udc->ep[0]);
219 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
227 static int proc_udc_open(struct inode *inode, struct file *file)
229 return single_open(file, proc_udc_show, PDE(inode)->data);
232 static const struct file_operations proc_ops = {
233 .owner = THIS_MODULE,
234 .open = proc_udc_open,
237 .release = single_release,
240 static void create_debug_file(struct at91_udc *udc)
242 udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
245 static void remove_debug_file(struct at91_udc *udc)
248 remove_proc_entry(debug_filename, NULL);
253 static inline void create_debug_file(struct at91_udc *udc) {}
254 static inline void remove_debug_file(struct at91_udc *udc) {}
259 /*-------------------------------------------------------------------------*/
261 static void done(struct at91_ep *ep, struct at91_request *req, int status)
263 unsigned stopped = ep->stopped;
264 struct at91_udc *udc = ep->udc;
266 list_del_init(&req->queue);
267 if (req->req.status == -EINPROGRESS)
268 req->req.status = status;
270 status = req->req.status;
271 if (status && status != -ESHUTDOWN)
272 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
275 req->req.complete(&ep->ep, &req->req);
276 ep->stopped = stopped;
278 /* ep0 is always ready; other endpoints need a non-empty queue */
279 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
280 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
283 /*-------------------------------------------------------------------------*/
285 /* bits indicating OUT fifo has data ready */
286 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
289 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
290 * back most of the value you just read (because of side effects, including
291 * bits that may change after reading and before writing).
293 * Except when changing a specific bit, always write values which:
294 * - clear SET_FX bits (setting them could change something)
295 * - set CLR_FX bits (clearing them could change something)
297 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
298 * that shouldn't normally be changed.
300 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
301 * implying a need to wait for one write to complete (test relevant bits)
302 * before starting the next write. This shouldn't be an issue given how
303 * infrequently we write, except maybe for write-then-read idioms.
305 #define SET_FX (AT91_UDP_TXPKTRDY)
306 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
307 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
309 /* pull OUT packet data from the endpoint's fifo */
310 static int read_fifo (struct at91_ep *ep, struct at91_request *req)
312 u32 __iomem *creg = ep->creg;
313 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
316 unsigned int count, bufferspace, is_done;
318 buf = req->req.buf + req->req.actual;
319 bufferspace = req->req.length - req->req.actual;
322 * there might be nothing to read if ep_queue() calls us,
323 * or if we already emptied both pingpong buffers
326 csr = __raw_readl(creg);
327 if ((csr & RX_DATA_READY) == 0)
330 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
331 if (count > ep->ep.maxpacket)
332 count = ep->ep.maxpacket;
333 if (count > bufferspace) {
334 DBG("%s buffer overflow\n", ep->ep.name);
335 req->req.status = -EOVERFLOW;
338 __raw_readsb(dreg, buf, count);
340 /* release and swap pingpong mem bank */
342 if (ep->is_pingpong) {
343 if (ep->fifo_bank == 0) {
344 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
347 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
351 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
352 __raw_writel(csr, creg);
354 req->req.actual += count;
355 is_done = (count < ep->ep.maxpacket);
356 if (count == bufferspace)
359 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
360 is_done ? " (done)" : "");
363 * avoid extra trips through IRQ logic for packets already in
364 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
368 else if (ep->is_pingpong) {
370 * One dummy read to delay the code because of a HW glitch:
371 * CSR returns bad RXCOUNT when read too soon after updating
374 csr = __raw_readl(creg);
376 bufferspace -= count;
384 /* load fifo for an IN packet */
385 static int write_fifo(struct at91_ep *ep, struct at91_request *req)
387 u32 __iomem *creg = ep->creg;
388 u32 csr = __raw_readl(creg);
389 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
390 unsigned total, count, is_last;
394 * TODO: allow for writing two packets to the fifo ... that'll
395 * reduce the amount of IN-NAKing, but probably won't affect
396 * throughput much. (Unlike preventing OUT-NAKing!)
400 * If ep_queue() calls us, the queue is empty and possibly in
401 * odd states like TXCOMP not yet cleared (we do it, saving at
402 * least one IRQ) or the fifo not yet being free. Those aren't
403 * issues normally (IRQ handler fast path).
405 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
406 if (csr & AT91_UDP_TXCOMP) {
408 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
409 __raw_writel(csr, creg);
410 csr = __raw_readl(creg);
412 if (csr & AT91_UDP_TXPKTRDY)
416 buf = req->req.buf + req->req.actual;
418 total = req->req.length - req->req.actual;
419 if (ep->ep.maxpacket < total) {
420 count = ep->ep.maxpacket;
424 is_last = (count < ep->ep.maxpacket) || !req->req.zero;
428 * Write the packet, maybe it's a ZLP.
430 * NOTE: incrementing req->actual before we receive the ACK means
431 * gadget driver IN bytecounts can be wrong in fault cases. That's
432 * fixable with PIO drivers like this one (save "count" here, and
433 * do the increment later on TX irq), but not for most DMA hardware.
435 * So all gadget drivers must accept that potential error. Some
436 * hardware supports precise fifo status reporting, letting them
437 * recover when the actual bytecount matters (e.g. for USB Test
438 * and Measurement Class devices).
440 __raw_writesb(dreg, buf, count);
442 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
443 __raw_writel(csr, creg);
444 req->req.actual += count;
446 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
447 is_last ? " (done)" : "");
453 static void nuke(struct at91_ep *ep, int status)
455 struct at91_request *req;
457 // terminer chaque requete dans la queue
459 if (list_empty(&ep->queue))
462 VDBG("%s %s\n", __func__, ep->ep.name);
463 while (!list_empty(&ep->queue)) {
464 req = list_entry(ep->queue.next, struct at91_request, queue);
465 done(ep, req, status);
469 /*-------------------------------------------------------------------------*/
471 static int at91_ep_enable(struct usb_ep *_ep,
472 const struct usb_endpoint_descriptor *desc)
474 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
475 struct at91_udc *dev = ep->udc;
482 || _ep->name == ep0name
483 || desc->bDescriptorType != USB_DT_ENDPOINT
484 || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0
485 || maxpacket > ep->maxpacket) {
486 DBG("bad ep or descriptor\n");
490 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
491 DBG("bogus device state\n");
495 tmp = usb_endpoint_type(desc);
497 case USB_ENDPOINT_XFER_CONTROL:
498 DBG("only one control endpoint\n");
500 case USB_ENDPOINT_XFER_INT:
504 case USB_ENDPOINT_XFER_BULK:
513 DBG("bogus maxpacket %d\n", maxpacket);
515 case USB_ENDPOINT_XFER_ISOC:
516 if (!ep->is_pingpong) {
517 DBG("iso requires double buffering\n");
524 local_irq_save(flags);
526 /* initialize endpoint to match this descriptor */
527 ep->is_in = usb_endpoint_dir_in(desc);
528 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
533 tmp |= AT91_UDP_EPEDS;
534 __raw_writel(tmp, ep->creg);
537 ep->ep.maxpacket = maxpacket;
540 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
541 * since endpoint resets don't reset hw pingpong state.
543 at91_udp_write(dev, AT91_UDP_RST_EP, ep->int_mask);
544 at91_udp_write(dev, AT91_UDP_RST_EP, 0);
546 local_irq_restore(flags);
550 static int at91_ep_disable (struct usb_ep * _ep)
552 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
553 struct at91_udc *udc = ep->udc;
556 if (ep == &ep->udc->ep[0])
559 local_irq_save(flags);
561 nuke(ep, -ESHUTDOWN);
563 /* restore the endpoint's pristine config */
565 ep->ep.maxpacket = ep->maxpacket;
567 /* reset fifos and endpoint */
568 if (ep->udc->clocked) {
569 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
570 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
571 __raw_writel(0, ep->creg);
574 local_irq_restore(flags);
579 * this is a PIO-only driver, so there's nothing
580 * interesting for request or buffer allocation.
583 static struct usb_request *
584 at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
586 struct at91_request *req;
588 req = kzalloc(sizeof (struct at91_request), gfp_flags);
592 INIT_LIST_HEAD(&req->queue);
596 static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
598 struct at91_request *req;
600 req = container_of(_req, struct at91_request, req);
601 BUG_ON(!list_empty(&req->queue));
605 static int at91_ep_queue(struct usb_ep *_ep,
606 struct usb_request *_req, gfp_t gfp_flags)
608 struct at91_request *req;
610 struct at91_udc *dev;
614 req = container_of(_req, struct at91_request, req);
615 ep = container_of(_ep, struct at91_ep, ep);
617 if (!_req || !_req->complete
618 || !_req->buf || !list_empty(&req->queue)) {
619 DBG("invalid request\n");
623 if (!_ep || (!ep->desc && ep->ep.name != ep0name)) {
630 if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
631 DBG("invalid device\n");
635 _req->status = -EINPROGRESS;
638 local_irq_save(flags);
640 /* try to kickstart any empty and idle queue */
641 if (list_empty(&ep->queue) && !ep->stopped) {
645 * If this control request has a non-empty DATA stage, this
646 * will start that stage. It works just like a non-control
647 * request (until the status stage starts, maybe early).
649 * If the data stage is empty, then this starts a successful
650 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
652 is_ep0 = (ep->ep.name == ep0name);
656 if (!dev->req_pending) {
662 * defer changing CONFG until after the gadget driver
663 * reconfigures the endpoints.
665 if (dev->wait_for_config_ack) {
666 tmp = at91_udp_read(dev, AT91_UDP_GLB_STAT);
667 tmp ^= AT91_UDP_CONFG;
668 VDBG("toggle config\n");
669 at91_udp_write(dev, AT91_UDP_GLB_STAT, tmp);
671 if (req->req.length == 0) {
673 PACKET("ep0 in/status\n");
675 tmp = __raw_readl(ep->creg);
677 tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
678 __raw_writel(tmp, ep->creg);
679 dev->req_pending = 0;
685 status = write_fifo(ep, req);
687 status = read_fifo(ep, req);
689 /* IN/STATUS stage is otherwise triggered by irq */
690 if (status && is_ep0)
696 if (req && !status) {
697 list_add_tail (&req->queue, &ep->queue);
698 at91_udp_write(dev, AT91_UDP_IER, ep->int_mask);
701 local_irq_restore(flags);
702 return (status < 0) ? status : 0;
705 static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
708 struct at91_request *req;
710 ep = container_of(_ep, struct at91_ep, ep);
711 if (!_ep || ep->ep.name == ep0name)
714 /* make sure it's actually queued on this endpoint */
715 list_for_each_entry (req, &ep->queue, queue) {
716 if (&req->req == _req)
719 if (&req->req != _req)
722 done(ep, req, -ECONNRESET);
726 static int at91_ep_set_halt(struct usb_ep *_ep, int value)
728 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
729 struct at91_udc *udc = ep->udc;
735 if (!_ep || ep->is_iso || !ep->udc->clocked)
739 local_irq_save(flags);
741 csr = __raw_readl(creg);
744 * fail with still-busy IN endpoints, ensuring correct sequencing
745 * of data tx then stall. note that the fifo rx bytecount isn't
746 * completely accurate as a tx bytecount.
748 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
754 csr |= AT91_UDP_FORCESTALL;
755 VDBG("halt %s\n", ep->ep.name);
757 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
758 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
759 csr &= ~AT91_UDP_FORCESTALL;
761 __raw_writel(csr, creg);
764 local_irq_restore(flags);
768 static const struct usb_ep_ops at91_ep_ops = {
769 .enable = at91_ep_enable,
770 .disable = at91_ep_disable,
771 .alloc_request = at91_ep_alloc_request,
772 .free_request = at91_ep_free_request,
773 .queue = at91_ep_queue,
774 .dequeue = at91_ep_dequeue,
775 .set_halt = at91_ep_set_halt,
776 // there's only imprecise fifo status reporting
779 /*-------------------------------------------------------------------------*/
781 static int at91_get_frame(struct usb_gadget *gadget)
783 struct at91_udc *udc = to_udc(gadget);
785 if (!to_udc(gadget)->clocked)
787 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
790 static int at91_wakeup(struct usb_gadget *gadget)
792 struct at91_udc *udc = to_udc(gadget);
794 int status = -EINVAL;
797 DBG("%s\n", __func__ );
798 local_irq_save(flags);
800 if (!udc->clocked || !udc->suspended)
803 /* NOTE: some "early versions" handle ESR differently ... */
805 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
806 if (!(glbstate & AT91_UDP_ESR))
808 glbstate |= AT91_UDP_ESR;
809 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
812 local_irq_restore(flags);
816 /* reinit == restore inital software state */
817 static void udc_reinit(struct at91_udc *udc)
821 INIT_LIST_HEAD(&udc->gadget.ep_list);
822 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
824 for (i = 0; i < NUM_ENDPOINTS; i++) {
825 struct at91_ep *ep = &udc->ep[i];
828 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
832 ep->ep.maxpacket = ep->maxpacket;
833 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
834 // initialiser une queue par endpoint
835 INIT_LIST_HEAD(&ep->queue);
839 static void stop_activity(struct at91_udc *udc)
841 struct usb_gadget_driver *driver = udc->driver;
844 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
846 udc->gadget.speed = USB_SPEED_UNKNOWN;
849 for (i = 0; i < NUM_ENDPOINTS; i++) {
850 struct at91_ep *ep = &udc->ep[i];
852 nuke(ep, -ESHUTDOWN);
855 driver->disconnect(&udc->gadget);
860 static void clk_on(struct at91_udc *udc)
865 clk_enable(udc->iclk);
866 clk_enable(udc->fclk);
869 static void clk_off(struct at91_udc *udc)
874 udc->gadget.speed = USB_SPEED_UNKNOWN;
875 clk_disable(udc->fclk);
876 clk_disable(udc->iclk);
880 * activate/deactivate link with host; minimize power usage for
881 * inactive links by cutting clocks and transceiver power.
883 static void pullup(struct at91_udc *udc, int is_on)
885 int active = !udc->board.pullup_active_low;
887 if (!udc->enabled || !udc->vbus)
889 DBG("%sactive\n", is_on ? "" : "in");
893 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
894 at91_udp_write(udc, AT91_UDP_TXVC, 0);
895 if (cpu_is_at91rm9200())
896 gpio_set_value(udc->board.pullup_pin, active);
897 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
898 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
900 txvc |= AT91_UDP_TXVC_PUON;
901 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
902 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
905 usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
906 usbpucr |= AT91_MATRIX_USBPUCR_PUON;
907 at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
911 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
912 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
913 if (cpu_is_at91rm9200())
914 gpio_set_value(udc->board.pullup_pin, !active);
915 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
916 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
918 txvc &= ~AT91_UDP_TXVC_PUON;
919 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
920 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
923 usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
924 usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
925 at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
931 /* vbus is here! turn everything on that's ready */
932 static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
934 struct at91_udc *udc = to_udc(gadget);
937 // VDBG("vbus %s\n", is_active ? "on" : "off");
938 local_irq_save(flags);
939 udc->vbus = (is_active != 0);
941 pullup(udc, is_active);
944 local_irq_restore(flags);
948 static int at91_pullup(struct usb_gadget *gadget, int is_on)
950 struct at91_udc *udc = to_udc(gadget);
953 local_irq_save(flags);
954 udc->enabled = is_on = !!is_on;
956 local_irq_restore(flags);
960 static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
962 struct at91_udc *udc = to_udc(gadget);
965 local_irq_save(flags);
966 udc->selfpowered = (is_on != 0);
967 local_irq_restore(flags);
971 static const struct usb_gadget_ops at91_udc_ops = {
972 .get_frame = at91_get_frame,
973 .wakeup = at91_wakeup,
974 .set_selfpowered = at91_set_selfpowered,
975 .vbus_session = at91_vbus_session,
976 .pullup = at91_pullup,
979 * VBUS-powered devices may also also want to support bigger
980 * power budgets after an appropriate SET_CONFIGURATION.
982 // .vbus_power = at91_vbus_power,
985 /*-------------------------------------------------------------------------*/
987 static int handle_ep(struct at91_ep *ep)
989 struct at91_request *req;
990 u32 __iomem *creg = ep->creg;
991 u32 csr = __raw_readl(creg);
993 if (!list_empty(&ep->queue))
994 req = list_entry(ep->queue.next,
995 struct at91_request, queue);
1000 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1002 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1003 __raw_writel(csr, creg);
1006 return write_fifo(ep, req);
1009 if (csr & AT91_UDP_STALLSENT) {
1010 /* STALLSENT bit == ISOERR */
1011 if (ep->is_iso && req)
1012 req->req.status = -EILSEQ;
1014 csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1015 __raw_writel(csr, creg);
1016 csr = __raw_readl(creg);
1018 if (req && (csr & RX_DATA_READY))
1019 return read_fifo(ep, req);
1026 struct usb_ctrlrequest r;
1029 static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1031 u32 __iomem *creg = ep->creg;
1032 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1033 unsigned rxcount, i = 0;
1038 /* read and ack SETUP; hard-fail for bogus packets */
1039 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1040 if (likely(rxcount == 8)) {
1042 pkt.raw[i++] = __raw_readb(dreg);
1043 if (pkt.r.bRequestType & USB_DIR_IN) {
1044 csr |= AT91_UDP_DIR;
1047 csr &= ~AT91_UDP_DIR;
1051 // REVISIT this happens sometimes under load; why??
1052 ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1056 csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1057 __raw_writel(csr, creg);
1058 udc->wait_for_addr_ack = 0;
1059 udc->wait_for_config_ack = 0;
1061 if (unlikely(status != 0))
1064 #define w_index le16_to_cpu(pkt.r.wIndex)
1065 #define w_value le16_to_cpu(pkt.r.wValue)
1066 #define w_length le16_to_cpu(pkt.r.wLength)
1068 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1069 pkt.r.bRequestType, pkt.r.bRequest,
1070 w_value, w_index, w_length);
1073 * A few standard requests get handled here, ones that touch
1074 * hardware ... notably for device and endpoint features.
1076 udc->req_pending = 1;
1077 csr = __raw_readl(creg);
1080 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1082 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1083 | USB_REQ_SET_ADDRESS:
1084 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1085 udc->addr = w_value;
1086 udc->wait_for_addr_ack = 1;
1087 udc->req_pending = 0;
1088 /* FADDR is set later, when we ack host STATUS */
1091 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1092 | USB_REQ_SET_CONFIGURATION:
1093 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1095 udc->wait_for_config_ack = (tmp == 0);
1097 udc->wait_for_config_ack = (tmp != 0);
1098 if (udc->wait_for_config_ack)
1099 VDBG("wait for config\n");
1100 /* CONFG is toggled later, if gadget driver succeeds */
1104 * Hosts may set or clear remote wakeup status, and
1105 * devices may report they're VBUS powered.
1107 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1108 | USB_REQ_GET_STATUS:
1109 tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
1110 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1111 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1112 PACKET("get device status\n");
1113 __raw_writeb(tmp, dreg);
1114 __raw_writeb(0, dreg);
1116 /* then STATUS starts later, automatically */
1117 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1118 | USB_REQ_SET_FEATURE:
1119 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1121 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1122 tmp |= AT91_UDP_ESR;
1123 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1125 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1126 | USB_REQ_CLEAR_FEATURE:
1127 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1129 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1130 tmp &= ~AT91_UDP_ESR;
1131 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1135 * Interfaces have no feature settings; this is pretty useless.
1136 * we won't even insist the interface exists...
1138 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1139 | USB_REQ_GET_STATUS:
1140 PACKET("get interface status\n");
1141 __raw_writeb(0, dreg);
1142 __raw_writeb(0, dreg);
1144 /* then STATUS starts later, automatically */
1145 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1146 | USB_REQ_SET_FEATURE:
1147 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1148 | USB_REQ_CLEAR_FEATURE:
1152 * Hosts may clear bulk/intr endpoint halt after the gadget
1153 * driver sets it (not widely used); or set it (for testing)
1155 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1156 | USB_REQ_GET_STATUS:
1157 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1159 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->desc))
1163 if ((w_index & USB_DIR_IN)) {
1166 } else if (ep->is_in)
1169 PACKET("get %s status\n", ep->ep.name);
1170 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1171 tmp = (1 << USB_ENDPOINT_HALT);
1174 __raw_writeb(tmp, dreg);
1175 __raw_writeb(0, dreg);
1177 /* then STATUS starts later, automatically */
1178 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1179 | USB_REQ_SET_FEATURE:
1180 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1182 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1184 if (!ep->desc || ep->is_iso)
1186 if ((w_index & USB_DIR_IN)) {
1189 } else if (ep->is_in)
1192 tmp = __raw_readl(ep->creg);
1194 tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1195 __raw_writel(tmp, ep->creg);
1197 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1198 | USB_REQ_CLEAR_FEATURE:
1199 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1201 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1205 if (!ep->desc || ep->is_iso)
1207 if ((w_index & USB_DIR_IN)) {
1210 } else if (ep->is_in)
1213 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1214 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1215 tmp = __raw_readl(ep->creg);
1217 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1218 __raw_writel(tmp, ep->creg);
1219 if (!list_empty(&ep->queue))
1228 /* pass request up to the gadget driver */
1230 status = udc->driver->setup(&udc->gadget, &pkt.r);
1235 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1236 pkt.r.bRequestType, pkt.r.bRequest, status);
1237 csr |= AT91_UDP_FORCESTALL;
1238 __raw_writel(csr, creg);
1239 udc->req_pending = 0;
1244 /* immediate successful (IN) STATUS after zero length DATA */
1245 PACKET("ep0 in/status\n");
1247 csr |= AT91_UDP_TXPKTRDY;
1248 __raw_writel(csr, creg);
1249 udc->req_pending = 0;
1253 static void handle_ep0(struct at91_udc *udc)
1255 struct at91_ep *ep0 = &udc->ep[0];
1256 u32 __iomem *creg = ep0->creg;
1257 u32 csr = __raw_readl(creg);
1258 struct at91_request *req;
1260 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1262 udc->req_pending = 0;
1264 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1265 __raw_writel(csr, creg);
1266 VDBG("ep0 stalled\n");
1267 csr = __raw_readl(creg);
1269 if (csr & AT91_UDP_RXSETUP) {
1271 udc->req_pending = 0;
1272 handle_setup(udc, ep0, csr);
1276 if (list_empty(&ep0->queue))
1279 req = list_entry(ep0->queue.next, struct at91_request, queue);
1281 /* host ACKed an IN packet that we sent */
1282 if (csr & AT91_UDP_TXCOMP) {
1284 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1286 /* write more IN DATA? */
1287 if (req && ep0->is_in) {
1289 udc->req_pending = 0;
1293 * - last IN DATA packet (including GET_STATUS)
1294 * - IN/STATUS for OUT DATA
1295 * - IN/STATUS for any zero-length DATA stage
1296 * except for the IN DATA case, the host should send
1297 * an OUT status later, which we'll ack.
1300 udc->req_pending = 0;
1301 __raw_writel(csr, creg);
1304 * SET_ADDRESS takes effect only after the STATUS
1305 * (to the original address) gets acked.
1307 if (udc->wait_for_addr_ack) {
1310 at91_udp_write(udc, AT91_UDP_FADDR,
1311 AT91_UDP_FEN | udc->addr);
1312 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1313 tmp &= ~AT91_UDP_FADDEN;
1315 tmp |= AT91_UDP_FADDEN;
1316 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1318 udc->wait_for_addr_ack = 0;
1319 VDBG("address %d\n", udc->addr);
1324 /* OUT packet arrived ... */
1325 else if (csr & AT91_UDP_RX_DATA_BK0) {
1327 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1329 /* OUT DATA stage */
1332 if (handle_ep(ep0)) {
1333 /* send IN/STATUS */
1334 PACKET("ep0 in/status\n");
1335 csr = __raw_readl(creg);
1337 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1338 __raw_writel(csr, creg);
1339 udc->req_pending = 0;
1341 } else if (udc->req_pending) {
1343 * AT91 hardware has a hard time with this
1344 * "deferred response" mode for control-OUT
1345 * transfers. (For control-IN it's fine.)
1347 * The normal solution leaves OUT data in the
1348 * fifo until the gadget driver is ready.
1349 * We couldn't do that here without disabling
1350 * the IRQ that tells about SETUP packets,
1351 * e.g. when the host gets impatient...
1353 * Working around it by copying into a buffer
1354 * would almost be a non-deferred response,
1355 * except that it wouldn't permit reliable
1356 * stalling of the request. Instead, demand
1357 * that gadget drivers not use this mode.
1359 DBG("no control-OUT deferred responses!\n");
1360 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1361 udc->req_pending = 0;
1364 /* STATUS stage for control-IN; ack. */
1366 PACKET("ep0 out/status ACK\n");
1367 __raw_writel(csr, creg);
1369 /* "early" status stage */
1376 static irqreturn_t at91_udc_irq (int irq, void *_udc)
1378 struct at91_udc *udc = _udc;
1380 int disable_clock = 0;
1382 if (!udc->clocked) {
1390 status = at91_udp_read(udc, AT91_UDP_ISR)
1391 & at91_udp_read(udc, AT91_UDP_IMR);
1395 /* USB reset irq: not maskable */
1396 if (status & AT91_UDP_ENDBUSRES) {
1397 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1398 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1399 /* Atmel code clears this irq twice */
1400 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1401 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1402 VDBG("end bus reset\n");
1407 at91_udp_write(udc, AT91_UDP_CSR(0),
1408 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1409 udc->gadget.speed = USB_SPEED_FULL;
1411 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1414 * NOTE: this driver keeps clocks off unless the
1415 * USB host is present. That saves power, but for
1416 * boards that don't support VBUS detection, both
1417 * clocks need to be active most of the time.
1420 /* host initiated suspend (3+ms bus idle) */
1421 } else if (status & AT91_UDP_RXSUSP) {
1422 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1423 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1424 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1425 // VDBG("bus suspend\n");
1431 * NOTE: when suspending a VBUS-powered device, the
1432 * gadget driver should switch into slow clock mode
1433 * and then into standby to avoid drawing more than
1434 * 500uA power (2500uA for some high-power configs).
1436 if (udc->driver && udc->driver->suspend)
1437 udc->driver->suspend(&udc->gadget);
1439 /* host initiated resume */
1440 } else if (status & AT91_UDP_RXRSM) {
1441 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1442 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1443 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1444 // VDBG("bus resume\n");
1445 if (!udc->suspended)
1450 * NOTE: for a VBUS-powered device, the gadget driver
1451 * would normally want to switch out of slow clock
1452 * mode into normal mode.
1454 if (udc->driver && udc->driver->resume)
1455 udc->driver->resume(&udc->gadget);
1457 /* endpoint IRQs are cleared by handling them */
1461 struct at91_ep *ep = &udc->ep[1];
1465 for (i = 1; i < NUM_ENDPOINTS; i++) {
1480 /*-------------------------------------------------------------------------*/
1482 static void nop_release(struct device *dev)
1484 /* nothing to free */
1487 static struct at91_udc controller = {
1489 .ops = &at91_udc_ops,
1490 .ep0 = &controller.ep[0].ep,
1491 .name = driver_name,
1493 .init_name = "gadget",
1494 .release = nop_release,
1500 .ops = &at91_ep_ops,
1509 .ops = &at91_ep_ops,
1519 .ops = &at91_ep_ops,
1528 /* could actually do bulk too */
1530 .ops = &at91_ep_ops,
1539 .ops = &at91_ep_ops,
1549 .ops = &at91_ep_ops,
1556 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1559 static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1561 struct at91_udc *udc = _udc;
1564 /* vbus needs at least brief debouncing */
1566 value = gpio_get_value(udc->board.vbus_pin);
1567 if (value != udc->vbus)
1568 at91_vbus_session(&udc->gadget, value);
1573 int usb_gadget_register_driver (struct usb_gadget_driver *driver)
1575 struct at91_udc *udc = &controller;
1579 || driver->speed < USB_SPEED_FULL
1581 || !driver->setup) {
1582 DBG("bad parameter.\n");
1587 DBG("UDC already has a gadget driver\n");
1591 udc->driver = driver;
1592 udc->gadget.dev.driver = &driver->driver;
1593 dev_set_drvdata(&udc->gadget.dev, &driver->driver);
1595 udc->selfpowered = 1;
1597 retval = driver->bind(&udc->gadget);
1599 DBG("driver->bind() returned %d\n", retval);
1601 udc->gadget.dev.driver = NULL;
1602 dev_set_drvdata(&udc->gadget.dev, NULL);
1604 udc->selfpowered = 0;
1608 local_irq_disable();
1612 DBG("bound to %s\n", driver->driver.name);
1615 EXPORT_SYMBOL (usb_gadget_register_driver);
1617 int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
1619 struct at91_udc *udc = &controller;
1621 if (!driver || driver != udc->driver || !driver->unbind)
1624 local_irq_disable();
1626 at91_udp_write(udc, AT91_UDP_IDR, ~0);
1630 driver->unbind(&udc->gadget);
1631 udc->gadget.dev.driver = NULL;
1632 dev_set_drvdata(&udc->gadget.dev, NULL);
1635 DBG("unbound from %s\n", driver->driver.name);
1638 EXPORT_SYMBOL (usb_gadget_unregister_driver);
1640 /*-------------------------------------------------------------------------*/
1642 static void at91udc_shutdown(struct platform_device *dev)
1644 /* force disconnect on reboot */
1645 pullup(platform_get_drvdata(dev), 0);
1648 static int __init at91udc_probe(struct platform_device *pdev)
1650 struct device *dev = &pdev->dev;
1651 struct at91_udc *udc;
1653 struct resource *res;
1655 if (!dev->platform_data) {
1656 /* small (so we copy it) but critical! */
1657 DBG("missing platform_data\n");
1661 if (pdev->num_resources != 2) {
1662 DBG("invalid num_resources\n");
1665 if ((pdev->resource[0].flags != IORESOURCE_MEM)
1666 || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1667 DBG("invalid resource type\n");
1671 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1675 if (!request_mem_region(res->start, resource_size(res), driver_name)) {
1676 DBG("someone's using UDC memory\n");
1680 /* init software state */
1682 udc->gadget.dev.parent = dev;
1683 udc->board = *(struct at91_udc_data *) dev->platform_data;
1687 /* rm9200 needs manual D+ pullup; off by default */
1688 if (cpu_is_at91rm9200()) {
1689 if (udc->board.pullup_pin <= 0) {
1690 DBG("no D+ pullup?\n");
1694 retval = gpio_request(udc->board.pullup_pin, "udc_pullup");
1696 DBG("D+ pullup is busy\n");
1699 gpio_direction_output(udc->board.pullup_pin,
1700 udc->board.pullup_active_low);
1703 /* newer chips have more FIFO memory than rm9200 */
1704 if (cpu_is_at91sam9260()) {
1705 udc->ep[0].maxpacket = 64;
1706 udc->ep[3].maxpacket = 64;
1707 udc->ep[4].maxpacket = 512;
1708 udc->ep[5].maxpacket = 512;
1709 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1710 udc->ep[3].maxpacket = 64;
1711 } else if (cpu_is_at91sam9263()) {
1712 udc->ep[0].maxpacket = 64;
1713 udc->ep[3].maxpacket = 64;
1716 udc->udp_baseaddr = ioremap(res->start, resource_size(res));
1717 if (!udc->udp_baseaddr) {
1724 /* get interface and function clocks */
1725 udc->iclk = clk_get(dev, "udc_clk");
1726 udc->fclk = clk_get(dev, "udpck");
1727 if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
1728 DBG("clocks missing\n");
1730 /* NOTE: we "know" here that refcounts on these are NOPs */
1734 retval = device_register(&udc->gadget.dev);
1738 /* don't do anything until we have both gadget driver and VBUS */
1739 clk_enable(udc->iclk);
1740 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1741 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1742 /* Clear all pending interrupts - UDP may be used by bootloader. */
1743 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1744 clk_disable(udc->iclk);
1746 /* request UDC and maybe VBUS irqs */
1747 udc->udp_irq = platform_get_irq(pdev, 0);
1748 retval = request_irq(udc->udp_irq, at91_udc_irq,
1749 IRQF_DISABLED, driver_name, udc);
1751 DBG("request irq %d failed\n", udc->udp_irq);
1754 if (udc->board.vbus_pin > 0) {
1755 retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
1757 DBG("request vbus pin failed\n");
1760 gpio_direction_input(udc->board.vbus_pin);
1763 * Get the initial state of VBUS - we cannot expect
1764 * a pending interrupt.
1766 udc->vbus = gpio_get_value(udc->board.vbus_pin);
1767 if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
1768 IRQF_DISABLED, driver_name, udc)) {
1769 DBG("request vbus irq %d failed\n",
1770 udc->board.vbus_pin);
1775 DBG("no VBUS detection, assuming always-on\n");
1778 dev_set_drvdata(dev, udc);
1779 device_init_wakeup(dev, 1);
1780 create_debug_file(udc);
1782 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1786 if (udc->board.vbus_pin > 0)
1787 gpio_free(udc->board.vbus_pin);
1789 free_irq(udc->udp_irq, udc);
1791 device_unregister(&udc->gadget.dev);
1793 iounmap(udc->udp_baseaddr);
1795 if (cpu_is_at91rm9200())
1796 gpio_free(udc->board.pullup_pin);
1798 release_mem_region(res->start, resource_size(res));
1799 DBG("%s probe failed, %d\n", driver_name, retval);
1803 static int __exit at91udc_remove(struct platform_device *pdev)
1805 struct at91_udc *udc = platform_get_drvdata(pdev);
1806 struct resource *res;
1815 device_init_wakeup(&pdev->dev, 0);
1816 remove_debug_file(udc);
1817 if (udc->board.vbus_pin > 0) {
1818 free_irq(udc->board.vbus_pin, udc);
1819 gpio_free(udc->board.vbus_pin);
1821 free_irq(udc->udp_irq, udc);
1822 device_unregister(&udc->gadget.dev);
1824 iounmap(udc->udp_baseaddr);
1826 if (cpu_is_at91rm9200())
1827 gpio_free(udc->board.pullup_pin);
1829 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1830 release_mem_region(res->start, resource_size(res));
1839 static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1841 struct at91_udc *udc = platform_get_drvdata(pdev);
1842 int wake = udc->driver && device_may_wakeup(&pdev->dev);
1844 /* Unless we can act normally to the host (letting it wake us up
1845 * whenever it has work for us) force disconnect. Wakeup requires
1846 * PLLB for USB events (signaling for reset, wakeup, or incoming
1847 * tokens) and VBUS irqs (on systems which support them).
1849 if ((!udc->suspended && udc->addr)
1851 || at91_suspend_entering_slow_clock()) {
1855 enable_irq_wake(udc->udp_irq);
1857 udc->active_suspend = wake;
1858 if (udc->board.vbus_pin > 0 && wake)
1859 enable_irq_wake(udc->board.vbus_pin);
1863 static int at91udc_resume(struct platform_device *pdev)
1865 struct at91_udc *udc = platform_get_drvdata(pdev);
1867 if (udc->board.vbus_pin > 0 && udc->active_suspend)
1868 disable_irq_wake(udc->board.vbus_pin);
1870 /* maybe reconnect to host; if so, clocks on */
1871 if (udc->active_suspend)
1872 disable_irq_wake(udc->udp_irq);
1878 #define at91udc_suspend NULL
1879 #define at91udc_resume NULL
1882 static struct platform_driver at91_udc_driver = {
1883 .remove = __exit_p(at91udc_remove),
1884 .shutdown = at91udc_shutdown,
1885 .suspend = at91udc_suspend,
1886 .resume = at91udc_resume,
1888 .name = (char *) driver_name,
1889 .owner = THIS_MODULE,
1893 static int __init udc_init_module(void)
1895 return platform_driver_probe(&at91_udc_driver, at91udc_probe);
1897 module_init(udc_init_module);
1899 static void __exit udc_exit_module(void)
1901 platform_driver_unregister(&at91_udc_driver);
1903 module_exit(udc_exit_module);
1905 MODULE_DESCRIPTION("AT91 udc driver");
1906 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
1907 MODULE_LICENSE("GPL");
1908 MODULE_ALIAS("platform:at91_udc");