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/slab.h>
34 #include <linux/smp_lock.h>
35 #include <linux/errno.h>
36 #include <linux/init.h>
37 #include <linux/list.h>
38 #include <linux/interrupt.h>
39 #include <linux/proc_fs.h>
40 #include <linux/clk.h>
41 #include <linux/usb/ch9.h>
42 #include <linux/usb_gadget.h>
44 #include <asm/byteorder.h>
45 #include <asm/hardware.h>
48 #include <asm/system.h>
49 #include <asm/mach-types.h>
51 #include <asm/arch/gpio.h>
52 #include <asm/arch/board.h>
53 #include <asm/arch/cpu.h>
54 #include <asm/arch/at91sam9261_matrix.h>
60 * This controller is simple and PIO-only. It's used in many AT91-series
61 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
62 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
64 * This driver expects the board has been wired with two GPIOs suppporting
65 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
66 * testing hasn't covered such cases.)
68 * The pullup is most important (so it's integrated on sam926x parts). It
69 * provides software control over whether the host enumerates the device.
71 * The VBUS sensing helps during enumeration, and allows both USB clocks
72 * (and the transceiver) to stay gated off until they're necessary, saving
73 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
74 * it may also be gated off by software during some Linux sleep states.
77 #define DRIVER_VERSION "3 May 2006"
79 static const char driver_name
[] = "at91_udc";
80 static const char ep0name
[] = "ep0";
83 #define at91_udp_read(dev, reg) \
84 __raw_readl((dev)->udp_baseaddr + (reg))
85 #define at91_udp_write(dev, reg, val) \
86 __raw_writel((val), (dev)->udp_baseaddr + (reg))
88 /*-------------------------------------------------------------------------*/
90 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
92 #include <linux/seq_file.h>
94 static const char debug_filename
[] = "driver/udc";
96 #define FOURBITS "%s%s%s%s"
97 #define EIGHTBITS FOURBITS FOURBITS
99 static void proc_ep_show(struct seq_file
*s
, struct at91_ep
*ep
)
101 static char *types
[] = {
102 "control", "out-iso", "out-bulk", "out-int",
103 "BOGUS", "in-iso", "in-bulk", "in-int"};
106 struct at91_request
*req
;
109 local_irq_save(flags
);
111 csr
= __raw_readl(ep
->creg
);
113 /* NOTE: not collecting per-endpoint irq statistics... */
116 seq_printf(s
, "%s, maxpacket %d %s%s %s%s\n",
117 ep
->ep
.name
, ep
->ep
.maxpacket
,
118 ep
->is_in
? "in" : "out",
119 ep
->is_iso
? " iso" : "",
121 ? (ep
->fifo_bank
? "pong" : "ping")
123 ep
->stopped
? " stopped" : "");
124 seq_printf(s
, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS
"\n",
126 (csr
& 0x07ff0000) >> 16,
127 (csr
& (1 << 15)) ? "enabled" : "disabled",
128 (csr
& (1 << 11)) ? "DATA1" : "DATA0",
129 types
[(csr
& 0x700) >> 8],
131 /* iff type is control then print current direction */
133 ? ((csr
& (1 << 7)) ? " IN" : " OUT")
135 (csr
& (1 << 6)) ? " rxdatabk1" : "",
136 (csr
& (1 << 5)) ? " forcestall" : "",
137 (csr
& (1 << 4)) ? " txpktrdy" : "",
139 (csr
& (1 << 3)) ? " stallsent" : "",
140 (csr
& (1 << 2)) ? " rxsetup" : "",
141 (csr
& (1 << 1)) ? " rxdatabk0" : "",
142 (csr
& (1 << 0)) ? " txcomp" : "");
143 if (list_empty (&ep
->queue
))
144 seq_printf(s
, "\t(queue empty)\n");
146 else list_for_each_entry (req
, &ep
->queue
, queue
) {
147 unsigned length
= req
->req
.actual
;
149 seq_printf(s
, "\treq %p len %d/%d buf %p\n",
151 req
->req
.length
, req
->req
.buf
);
153 local_irq_restore(flags
);
156 static void proc_irq_show(struct seq_file
*s
, const char *label
, u32 mask
)
160 seq_printf(s
, "%s %04x:%s%s" FOURBITS
, label
, mask
,
161 (mask
& (1 << 13)) ? " wakeup" : "",
162 (mask
& (1 << 12)) ? " endbusres" : "",
164 (mask
& (1 << 11)) ? " sofint" : "",
165 (mask
& (1 << 10)) ? " extrsm" : "",
166 (mask
& (1 << 9)) ? " rxrsm" : "",
167 (mask
& (1 << 8)) ? " rxsusp" : "");
168 for (i
= 0; i
< 8; i
++) {
170 seq_printf(s
, " ep%d", i
);
175 static int proc_udc_show(struct seq_file
*s
, void *unused
)
177 struct at91_udc
*udc
= s
->private;
181 seq_printf(s
, "%s: version %s\n", driver_name
, DRIVER_VERSION
);
183 seq_printf(s
, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
184 udc
->vbus
? "present" : "off",
186 ? (udc
->vbus
? "active" : "enabled")
188 udc
->selfpowered
? "self" : "VBUS",
189 udc
->suspended
? ", suspended" : "",
190 udc
->driver
? udc
->driver
->driver
.name
: "(none)");
192 /* don't access registers when interface isn't clocked */
194 seq_printf(s
, "(not clocked)\n");
198 tmp
= at91_udp_read(udc
, AT91_UDP_FRM_NUM
);
199 seq_printf(s
, "frame %05x:%s%s frame=%d\n", tmp
,
200 (tmp
& AT91_UDP_FRM_OK
) ? " ok" : "",
201 (tmp
& AT91_UDP_FRM_ERR
) ? " err" : "",
202 (tmp
& AT91_UDP_NUM
));
204 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
205 seq_printf(s
, "glbstate %02x:%s" FOURBITS
"\n", tmp
,
206 (tmp
& AT91_UDP_RMWUPE
) ? " rmwupe" : "",
207 (tmp
& AT91_UDP_RSMINPR
) ? " rsminpr" : "",
208 (tmp
& AT91_UDP_ESR
) ? " esr" : "",
209 (tmp
& AT91_UDP_CONFG
) ? " confg" : "",
210 (tmp
& AT91_UDP_FADDEN
) ? " fadden" : "");
212 tmp
= at91_udp_read(udc
, AT91_UDP_FADDR
);
213 seq_printf(s
, "faddr %03x:%s fadd=%d\n", tmp
,
214 (tmp
& AT91_UDP_FEN
) ? " fen" : "",
215 (tmp
& AT91_UDP_FADD
));
217 proc_irq_show(s
, "imr ", at91_udp_read(udc
, AT91_UDP_IMR
));
218 proc_irq_show(s
, "isr ", at91_udp_read(udc
, AT91_UDP_ISR
));
220 if (udc
->enabled
&& udc
->vbus
) {
221 proc_ep_show(s
, &udc
->ep
[0]);
222 list_for_each_entry (ep
, &udc
->gadget
.ep_list
, ep
.ep_list
) {
230 static int proc_udc_open(struct inode
*inode
, struct file
*file
)
232 return single_open(file
, proc_udc_show
, PDE(inode
)->data
);
235 static const struct file_operations proc_ops
= {
236 .open
= proc_udc_open
,
239 .release
= single_release
,
242 static void create_debug_file(struct at91_udc
*udc
)
244 struct proc_dir_entry
*pde
;
246 pde
= create_proc_entry (debug_filename
, 0, NULL
);
251 pde
->proc_fops
= &proc_ops
;
255 static void remove_debug_file(struct at91_udc
*udc
)
258 remove_proc_entry(debug_filename
, NULL
);
263 static inline void create_debug_file(struct at91_udc
*udc
) {}
264 static inline void remove_debug_file(struct at91_udc
*udc
) {}
269 /*-------------------------------------------------------------------------*/
271 static void done(struct at91_ep
*ep
, struct at91_request
*req
, int status
)
273 unsigned stopped
= ep
->stopped
;
274 struct at91_udc
*udc
= ep
->udc
;
276 list_del_init(&req
->queue
);
277 if (req
->req
.status
== -EINPROGRESS
)
278 req
->req
.status
= status
;
280 status
= req
->req
.status
;
281 if (status
&& status
!= -ESHUTDOWN
)
282 VDBG("%s done %p, status %d\n", ep
->ep
.name
, req
, status
);
285 req
->req
.complete(&ep
->ep
, &req
->req
);
286 ep
->stopped
= stopped
;
288 /* ep0 is always ready; other endpoints need a non-empty queue */
289 if (list_empty(&ep
->queue
) && ep
->int_mask
!= (1 << 0))
290 at91_udp_write(udc
, AT91_UDP_IDR
, ep
->int_mask
);
293 /*-------------------------------------------------------------------------*/
295 /* bits indicating OUT fifo has data ready */
296 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
299 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
300 * back most of the value you just read (because of side effects, including
301 * bits that may change after reading and before writing).
303 * Except when changing a specific bit, always write values which:
304 * - clear SET_FX bits (setting them could change something)
305 * - set CLR_FX bits (clearing them could change something)
307 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
308 * that shouldn't normally be changed.
310 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
311 * implying a need to wait for one write to complete (test relevant bits)
312 * before starting the next write. This shouldn't be an issue given how
313 * infrequently we write, except maybe for write-then-read idioms.
315 #define SET_FX (AT91_UDP_TXPKTRDY)
316 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
317 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
319 /* pull OUT packet data from the endpoint's fifo */
320 static int read_fifo (struct at91_ep
*ep
, struct at91_request
*req
)
322 u32 __iomem
*creg
= ep
->creg
;
323 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
326 unsigned int count
, bufferspace
, is_done
;
328 buf
= req
->req
.buf
+ req
->req
.actual
;
329 bufferspace
= req
->req
.length
- req
->req
.actual
;
332 * there might be nothing to read if ep_queue() calls us,
333 * or if we already emptied both pingpong buffers
336 csr
= __raw_readl(creg
);
337 if ((csr
& RX_DATA_READY
) == 0)
340 count
= (csr
& AT91_UDP_RXBYTECNT
) >> 16;
341 if (count
> ep
->ep
.maxpacket
)
342 count
= ep
->ep
.maxpacket
;
343 if (count
> bufferspace
) {
344 DBG("%s buffer overflow\n", ep
->ep
.name
);
345 req
->req
.status
= -EOVERFLOW
;
348 __raw_readsb(dreg
, buf
, count
);
350 /* release and swap pingpong mem bank */
352 if (ep
->is_pingpong
) {
353 if (ep
->fifo_bank
== 0) {
354 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
357 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK1
);
361 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
362 __raw_writel(csr
, creg
);
364 req
->req
.actual
+= count
;
365 is_done
= (count
< ep
->ep
.maxpacket
);
366 if (count
== bufferspace
)
369 PACKET("%s %p out/%d%s\n", ep
->ep
.name
, &req
->req
, count
,
370 is_done
? " (done)" : "");
373 * avoid extra trips through IRQ logic for packets already in
374 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
378 else if (ep
->is_pingpong
) {
379 bufferspace
-= count
;
387 /* load fifo for an IN packet */
388 static int write_fifo(struct at91_ep
*ep
, struct at91_request
*req
)
390 u32 __iomem
*creg
= ep
->creg
;
391 u32 csr
= __raw_readl(creg
);
392 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
393 unsigned total
, count
, is_last
;
396 * TODO: allow for writing two packets to the fifo ... that'll
397 * reduce the amount of IN-NAKing, but probably won't affect
398 * throughput much. (Unlike preventing OUT-NAKing!)
402 * If ep_queue() calls us, the queue is empty and possibly in
403 * odd states like TXCOMP not yet cleared (we do it, saving at
404 * least one IRQ) or the fifo not yet being free. Those aren't
405 * issues normally (IRQ handler fast path).
407 if (unlikely(csr
& (AT91_UDP_TXCOMP
| AT91_UDP_TXPKTRDY
))) {
408 if (csr
& AT91_UDP_TXCOMP
) {
410 csr
&= ~(SET_FX
| AT91_UDP_TXCOMP
);
411 __raw_writel(csr
, creg
);
412 csr
= __raw_readl(creg
);
414 if (csr
& AT91_UDP_TXPKTRDY
)
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
, req
->req
.buf
+ req
->req
.actual
, 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", __FUNCTION__
, 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
= desc
->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
;
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
= (desc
->bEndpointAddress
& USB_DIR_IN
) != 0;
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
, unsigned int 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 void *at91_ep_alloc_buffer(
612 return kmalloc(bytes
, gfp_flags
);
615 static void at91_ep_free_buffer(
624 static int at91_ep_queue(struct usb_ep
*_ep
,
625 struct usb_request
*_req
, gfp_t gfp_flags
)
627 struct at91_request
*req
;
629 struct at91_udc
*dev
;
633 req
= container_of(_req
, struct at91_request
, req
);
634 ep
= container_of(_ep
, struct at91_ep
, ep
);
636 if (!_req
|| !_req
->complete
637 || !_req
->buf
|| !list_empty(&req
->queue
)) {
638 DBG("invalid request\n");
642 if (!_ep
|| (!ep
->desc
&& ep
->ep
.name
!= ep0name
)) {
649 if (!dev
|| !dev
->driver
|| dev
->gadget
.speed
== USB_SPEED_UNKNOWN
) {
650 DBG("invalid device\n");
654 _req
->status
= -EINPROGRESS
;
657 local_irq_save(flags
);
659 /* try to kickstart any empty and idle queue */
660 if (list_empty(&ep
->queue
) && !ep
->stopped
) {
664 * If this control request has a non-empty DATA stage, this
665 * will start that stage. It works just like a non-control
666 * request (until the status stage starts, maybe early).
668 * If the data stage is empty, then this starts a successful
669 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
671 is_ep0
= (ep
->ep
.name
== ep0name
);
675 if (!dev
->req_pending
) {
681 * defer changing CONFG until after the gadget driver
682 * reconfigures the endpoints.
684 if (dev
->wait_for_config_ack
) {
685 tmp
= at91_udp_read(dev
, AT91_UDP_GLB_STAT
);
686 tmp
^= AT91_UDP_CONFG
;
687 VDBG("toggle config\n");
688 at91_udp_write(dev
, AT91_UDP_GLB_STAT
, tmp
);
690 if (req
->req
.length
== 0) {
692 PACKET("ep0 in/status\n");
694 tmp
= __raw_readl(ep
->creg
);
696 tmp
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
697 __raw_writel(tmp
, ep
->creg
);
698 dev
->req_pending
= 0;
704 status
= write_fifo(ep
, req
);
706 status
= read_fifo(ep
, req
);
708 /* IN/STATUS stage is otherwise triggered by irq */
709 if (status
&& is_ep0
)
715 if (req
&& !status
) {
716 list_add_tail (&req
->queue
, &ep
->queue
);
717 at91_udp_write(dev
, AT91_UDP_IER
, ep
->int_mask
);
720 local_irq_restore(flags
);
721 return (status
< 0) ? status
: 0;
724 static int at91_ep_dequeue(struct usb_ep
*_ep
, struct usb_request
*_req
)
727 struct at91_request
*req
;
729 ep
= container_of(_ep
, struct at91_ep
, ep
);
730 if (!_ep
|| ep
->ep
.name
== ep0name
)
733 /* make sure it's actually queued on this endpoint */
734 list_for_each_entry (req
, &ep
->queue
, queue
) {
735 if (&req
->req
== _req
)
738 if (&req
->req
!= _req
)
741 done(ep
, req
, -ECONNRESET
);
745 static int at91_ep_set_halt(struct usb_ep
*_ep
, int value
)
747 struct at91_ep
*ep
= container_of(_ep
, struct at91_ep
, ep
);
748 struct at91_udc
*udc
= ep
->udc
;
754 if (!_ep
|| ep
->is_iso
|| !ep
->udc
->clocked
)
758 local_irq_save(flags
);
760 csr
= __raw_readl(creg
);
763 * fail with still-busy IN endpoints, ensuring correct sequencing
764 * of data tx then stall. note that the fifo rx bytecount isn't
765 * completely accurate as a tx bytecount.
767 if (ep
->is_in
&& (!list_empty(&ep
->queue
) || (csr
>> 16) != 0))
773 csr
|= AT91_UDP_FORCESTALL
;
774 VDBG("halt %s\n", ep
->ep
.name
);
776 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
777 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
778 csr
&= ~AT91_UDP_FORCESTALL
;
780 __raw_writel(csr
, creg
);
783 local_irq_restore(flags
);
787 static const struct usb_ep_ops at91_ep_ops
= {
788 .enable
= at91_ep_enable
,
789 .disable
= at91_ep_disable
,
790 .alloc_request
= at91_ep_alloc_request
,
791 .free_request
= at91_ep_free_request
,
792 .alloc_buffer
= at91_ep_alloc_buffer
,
793 .free_buffer
= at91_ep_free_buffer
,
794 .queue
= at91_ep_queue
,
795 .dequeue
= at91_ep_dequeue
,
796 .set_halt
= at91_ep_set_halt
,
797 // there's only imprecise fifo status reporting
800 /*-------------------------------------------------------------------------*/
802 static int at91_get_frame(struct usb_gadget
*gadget
)
804 struct at91_udc
*udc
= to_udc(gadget
);
806 if (!to_udc(gadget
)->clocked
)
808 return at91_udp_read(udc
, AT91_UDP_FRM_NUM
) & AT91_UDP_NUM
;
811 static int at91_wakeup(struct usb_gadget
*gadget
)
813 struct at91_udc
*udc
= to_udc(gadget
);
815 int status
= -EINVAL
;
818 DBG("%s\n", __FUNCTION__
);
819 local_irq_save(flags
);
821 if (!udc
->clocked
|| !udc
->suspended
)
824 /* NOTE: some "early versions" handle ESR differently ... */
826 glbstate
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
827 if (!(glbstate
& AT91_UDP_ESR
))
829 glbstate
|= AT91_UDP_ESR
;
830 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, glbstate
);
833 local_irq_restore(flags
);
837 /* reinit == restore inital software state */
838 static void udc_reinit(struct at91_udc
*udc
)
842 INIT_LIST_HEAD(&udc
->gadget
.ep_list
);
843 INIT_LIST_HEAD(&udc
->gadget
.ep0
->ep_list
);
845 for (i
= 0; i
< NUM_ENDPOINTS
; i
++) {
846 struct at91_ep
*ep
= &udc
->ep
[i
];
849 list_add_tail(&ep
->ep
.ep_list
, &udc
->gadget
.ep_list
);
853 ep
->ep
.maxpacket
= ep
->maxpacket
;
854 ep
->creg
= (void __iomem
*) udc
->udp_baseaddr
+ AT91_UDP_CSR(i
);
855 // initialiser une queue par endpoint
856 INIT_LIST_HEAD(&ep
->queue
);
860 static void stop_activity(struct at91_udc
*udc
)
862 struct usb_gadget_driver
*driver
= udc
->driver
;
865 if (udc
->gadget
.speed
== USB_SPEED_UNKNOWN
)
867 udc
->gadget
.speed
= USB_SPEED_UNKNOWN
;
870 for (i
= 0; i
< NUM_ENDPOINTS
; i
++) {
871 struct at91_ep
*ep
= &udc
->ep
[i
];
873 nuke(ep
, -ESHUTDOWN
);
876 driver
->disconnect(&udc
->gadget
);
881 static void clk_on(struct at91_udc
*udc
)
886 clk_enable(udc
->iclk
);
887 clk_enable(udc
->fclk
);
890 static void clk_off(struct at91_udc
*udc
)
895 udc
->gadget
.speed
= USB_SPEED_UNKNOWN
;
896 clk_disable(udc
->fclk
);
897 clk_disable(udc
->iclk
);
901 * activate/deactivate link with host; minimize power usage for
902 * inactive links by cutting clocks and transceiver power.
904 static void pullup(struct at91_udc
*udc
, int is_on
)
906 if (!udc
->enabled
|| !udc
->vbus
)
908 DBG("%sactive\n", is_on
? "" : "in");
912 at91_udp_write(udc
, AT91_UDP_TXVC
, 0);
913 if (cpu_is_at91rm9200())
914 at91_set_gpio_value(udc
->board
.pullup_pin
, 1);
915 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) {
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()) {
923 usbpucr
= at91_sys_read(AT91_MATRIX_USBPUCR
);
924 usbpucr
|= AT91_MATRIX_USBPUCR_PUON
;
925 at91_sys_write(AT91_MATRIX_USBPUCR
, usbpucr
);
929 at91_udp_write(udc
, AT91_UDP_TXVC
, AT91_UDP_TXVC_TXVDIS
);
930 if (cpu_is_at91rm9200())
931 at91_set_gpio_value(udc
->board
.pullup_pin
, 0);
932 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) {
933 u32 txvc
= at91_udp_read(udc
, AT91_UDP_TXVC
);
935 txvc
&= ~AT91_UDP_TXVC_PUON
;
936 at91_udp_write(udc
, AT91_UDP_TXVC
, txvc
);
937 } else if (cpu_is_at91sam9261()) {
940 usbpucr
= at91_sys_read(AT91_MATRIX_USBPUCR
);
941 usbpucr
&= ~AT91_MATRIX_USBPUCR_PUON
;
942 at91_sys_write(AT91_MATRIX_USBPUCR
, usbpucr
);
948 /* vbus is here! turn everything on that's ready */
949 static int at91_vbus_session(struct usb_gadget
*gadget
, int is_active
)
951 struct at91_udc
*udc
= to_udc(gadget
);
954 // VDBG("vbus %s\n", is_active ? "on" : "off");
955 local_irq_save(flags
);
956 udc
->vbus
= (is_active
!= 0);
958 pullup(udc
, is_active
);
961 local_irq_restore(flags
);
965 static int at91_pullup(struct usb_gadget
*gadget
, int is_on
)
967 struct at91_udc
*udc
= to_udc(gadget
);
970 local_irq_save(flags
);
971 udc
->enabled
= is_on
= !!is_on
;
973 local_irq_restore(flags
);
977 static int at91_set_selfpowered(struct usb_gadget
*gadget
, int is_on
)
979 struct at91_udc
*udc
= to_udc(gadget
);
982 local_irq_save(flags
);
983 udc
->selfpowered
= (is_on
!= 0);
984 local_irq_restore(flags
);
988 static const struct usb_gadget_ops at91_udc_ops
= {
989 .get_frame
= at91_get_frame
,
990 .wakeup
= at91_wakeup
,
991 .set_selfpowered
= at91_set_selfpowered
,
992 .vbus_session
= at91_vbus_session
,
993 .pullup
= at91_pullup
,
996 * VBUS-powered devices may also also want to support bigger
997 * power budgets after an appropriate SET_CONFIGURATION.
999 // .vbus_power = at91_vbus_power,
1002 /*-------------------------------------------------------------------------*/
1004 static int handle_ep(struct at91_ep
*ep
)
1006 struct at91_request
*req
;
1007 u32 __iomem
*creg
= ep
->creg
;
1008 u32 csr
= __raw_readl(creg
);
1010 if (!list_empty(&ep
->queue
))
1011 req
= list_entry(ep
->queue
.next
,
1012 struct at91_request
, queue
);
1017 if (csr
& (AT91_UDP_STALLSENT
| AT91_UDP_TXCOMP
)) {
1019 csr
&= ~(SET_FX
| AT91_UDP_STALLSENT
| AT91_UDP_TXCOMP
);
1020 __raw_writel(csr
, creg
);
1023 return write_fifo(ep
, req
);
1026 if (csr
& AT91_UDP_STALLSENT
) {
1027 /* STALLSENT bit == ISOERR */
1028 if (ep
->is_iso
&& req
)
1029 req
->req
.status
= -EILSEQ
;
1031 csr
&= ~(SET_FX
| AT91_UDP_STALLSENT
);
1032 __raw_writel(csr
, creg
);
1033 csr
= __raw_readl(creg
);
1035 if (req
&& (csr
& RX_DATA_READY
))
1036 return read_fifo(ep
, req
);
1043 struct usb_ctrlrequest r
;
1046 static void handle_setup(struct at91_udc
*udc
, struct at91_ep
*ep
, u32 csr
)
1048 u32 __iomem
*creg
= ep
->creg
;
1049 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1050 unsigned rxcount
, i
= 0;
1055 /* read and ack SETUP; hard-fail for bogus packets */
1056 rxcount
= (csr
& AT91_UDP_RXBYTECNT
) >> 16;
1057 if (likely(rxcount
== 8)) {
1059 pkt
.raw
[i
++] = __raw_readb(dreg
);
1060 if (pkt
.r
.bRequestType
& USB_DIR_IN
) {
1061 csr
|= AT91_UDP_DIR
;
1064 csr
&= ~AT91_UDP_DIR
;
1068 // REVISIT this happens sometimes under load; why??
1069 ERR("SETUP len %d, csr %08x\n", rxcount
, csr
);
1073 csr
&= ~(SET_FX
| AT91_UDP_RXSETUP
);
1074 __raw_writel(csr
, creg
);
1075 udc
->wait_for_addr_ack
= 0;
1076 udc
->wait_for_config_ack
= 0;
1078 if (unlikely(status
!= 0))
1081 #define w_index le16_to_cpu(pkt.r.wIndex)
1082 #define w_value le16_to_cpu(pkt.r.wValue)
1083 #define w_length le16_to_cpu(pkt.r.wLength)
1085 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1086 pkt
.r
.bRequestType
, pkt
.r
.bRequest
,
1087 w_value
, w_index
, w_length
);
1090 * A few standard requests get handled here, ones that touch
1091 * hardware ... notably for device and endpoint features.
1093 udc
->req_pending
= 1;
1094 csr
= __raw_readl(creg
);
1097 switch ((pkt
.r
.bRequestType
<< 8) | pkt
.r
.bRequest
) {
1099 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1100 | USB_REQ_SET_ADDRESS
:
1101 __raw_writel(csr
| AT91_UDP_TXPKTRDY
, creg
);
1102 udc
->addr
= w_value
;
1103 udc
->wait_for_addr_ack
= 1;
1104 udc
->req_pending
= 0;
1105 /* FADDR is set later, when we ack host STATUS */
1108 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1109 | USB_REQ_SET_CONFIGURATION
:
1110 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
) & AT91_UDP_CONFG
;
1112 udc
->wait_for_config_ack
= (tmp
== 0);
1114 udc
->wait_for_config_ack
= (tmp
!= 0);
1115 if (udc
->wait_for_config_ack
)
1116 VDBG("wait for config\n");
1117 /* CONFG is toggled later, if gadget driver succeeds */
1121 * Hosts may set or clear remote wakeup status, and
1122 * devices may report they're VBUS powered.
1124 case ((USB_DIR_IN
|USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1125 | USB_REQ_GET_STATUS
:
1126 tmp
= (udc
->selfpowered
<< USB_DEVICE_SELF_POWERED
);
1127 if (at91_udp_read(udc
, AT91_UDP_GLB_STAT
) & AT91_UDP_ESR
)
1128 tmp
|= (1 << USB_DEVICE_REMOTE_WAKEUP
);
1129 PACKET("get device status\n");
1130 __raw_writeb(tmp
, dreg
);
1131 __raw_writeb(0, dreg
);
1133 /* then STATUS starts later, automatically */
1134 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1135 | USB_REQ_SET_FEATURE
:
1136 if (w_value
!= USB_DEVICE_REMOTE_WAKEUP
)
1138 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
1139 tmp
|= AT91_UDP_ESR
;
1140 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
1142 case ((USB_TYPE_STANDARD
|USB_RECIP_DEVICE
) << 8)
1143 | USB_REQ_CLEAR_FEATURE
:
1144 if (w_value
!= USB_DEVICE_REMOTE_WAKEUP
)
1146 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
1147 tmp
&= ~AT91_UDP_ESR
;
1148 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
1152 * Interfaces have no feature settings; this is pretty useless.
1153 * we won't even insist the interface exists...
1155 case ((USB_DIR_IN
|USB_TYPE_STANDARD
|USB_RECIP_INTERFACE
) << 8)
1156 | USB_REQ_GET_STATUS
:
1157 PACKET("get interface status\n");
1158 __raw_writeb(0, dreg
);
1159 __raw_writeb(0, dreg
);
1161 /* then STATUS starts later, automatically */
1162 case ((USB_TYPE_STANDARD
|USB_RECIP_INTERFACE
) << 8)
1163 | USB_REQ_SET_FEATURE
:
1164 case ((USB_TYPE_STANDARD
|USB_RECIP_INTERFACE
) << 8)
1165 | USB_REQ_CLEAR_FEATURE
:
1169 * Hosts may clear bulk/intr endpoint halt after the gadget
1170 * driver sets it (not widely used); or set it (for testing)
1172 case ((USB_DIR_IN
|USB_TYPE_STANDARD
|USB_RECIP_ENDPOINT
) << 8)
1173 | USB_REQ_GET_STATUS
:
1174 tmp
= w_index
& USB_ENDPOINT_NUMBER_MASK
;
1176 if (tmp
> NUM_ENDPOINTS
|| (tmp
&& !ep
->desc
))
1180 if ((w_index
& USB_DIR_IN
)) {
1183 } else if (ep
->is_in
)
1186 PACKET("get %s status\n", ep
->ep
.name
);
1187 if (__raw_readl(ep
->creg
) & AT91_UDP_FORCESTALL
)
1188 tmp
= (1 << USB_ENDPOINT_HALT
);
1191 __raw_writeb(tmp
, dreg
);
1192 __raw_writeb(0, dreg
);
1194 /* then STATUS starts later, automatically */
1195 case ((USB_TYPE_STANDARD
|USB_RECIP_ENDPOINT
) << 8)
1196 | USB_REQ_SET_FEATURE
:
1197 tmp
= w_index
& USB_ENDPOINT_NUMBER_MASK
;
1199 if (w_value
!= USB_ENDPOINT_HALT
|| tmp
> NUM_ENDPOINTS
)
1201 if (!ep
->desc
|| ep
->is_iso
)
1203 if ((w_index
& USB_DIR_IN
)) {
1206 } else if (ep
->is_in
)
1209 tmp
= __raw_readl(ep
->creg
);
1211 tmp
|= CLR_FX
| AT91_UDP_FORCESTALL
;
1212 __raw_writel(tmp
, ep
->creg
);
1214 case ((USB_TYPE_STANDARD
|USB_RECIP_ENDPOINT
) << 8)
1215 | USB_REQ_CLEAR_FEATURE
:
1216 tmp
= w_index
& USB_ENDPOINT_NUMBER_MASK
;
1218 if (w_value
!= USB_ENDPOINT_HALT
|| tmp
> NUM_ENDPOINTS
)
1222 if (!ep
->desc
|| ep
->is_iso
)
1224 if ((w_index
& USB_DIR_IN
)) {
1227 } else if (ep
->is_in
)
1230 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
1231 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
1232 tmp
= __raw_readl(ep
->creg
);
1234 tmp
&= ~(SET_FX
| AT91_UDP_FORCESTALL
);
1235 __raw_writel(tmp
, ep
->creg
);
1236 if (!list_empty(&ep
->queue
))
1245 /* pass request up to the gadget driver */
1247 status
= udc
->driver
->setup(&udc
->gadget
, &pkt
.r
);
1252 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1253 pkt
.r
.bRequestType
, pkt
.r
.bRequest
, status
);
1254 csr
|= AT91_UDP_FORCESTALL
;
1255 __raw_writel(csr
, creg
);
1256 udc
->req_pending
= 0;
1261 /* immediate successful (IN) STATUS after zero length DATA */
1262 PACKET("ep0 in/status\n");
1264 csr
|= AT91_UDP_TXPKTRDY
;
1265 __raw_writel(csr
, creg
);
1266 udc
->req_pending
= 0;
1270 static void handle_ep0(struct at91_udc
*udc
)
1272 struct at91_ep
*ep0
= &udc
->ep
[0];
1273 u32 __iomem
*creg
= ep0
->creg
;
1274 u32 csr
= __raw_readl(creg
);
1275 struct at91_request
*req
;
1277 if (unlikely(csr
& AT91_UDP_STALLSENT
)) {
1279 udc
->req_pending
= 0;
1281 csr
&= ~(SET_FX
| AT91_UDP_STALLSENT
| AT91_UDP_FORCESTALL
);
1282 __raw_writel(csr
, creg
);
1283 VDBG("ep0 stalled\n");
1284 csr
= __raw_readl(creg
);
1286 if (csr
& AT91_UDP_RXSETUP
) {
1288 udc
->req_pending
= 0;
1289 handle_setup(udc
, ep0
, csr
);
1293 if (list_empty(&ep0
->queue
))
1296 req
= list_entry(ep0
->queue
.next
, struct at91_request
, queue
);
1298 /* host ACKed an IN packet that we sent */
1299 if (csr
& AT91_UDP_TXCOMP
) {
1301 csr
&= ~(SET_FX
| AT91_UDP_TXCOMP
);
1303 /* write more IN DATA? */
1304 if (req
&& ep0
->is_in
) {
1306 udc
->req_pending
= 0;
1310 * - last IN DATA packet (including GET_STATUS)
1311 * - IN/STATUS for OUT DATA
1312 * - IN/STATUS for any zero-length DATA stage
1313 * except for the IN DATA case, the host should send
1314 * an OUT status later, which we'll ack.
1317 udc
->req_pending
= 0;
1318 __raw_writel(csr
, creg
);
1321 * SET_ADDRESS takes effect only after the STATUS
1322 * (to the original address) gets acked.
1324 if (udc
->wait_for_addr_ack
) {
1327 at91_udp_write(udc
, AT91_UDP_FADDR
,
1328 AT91_UDP_FEN
| udc
->addr
);
1329 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
1330 tmp
&= ~AT91_UDP_FADDEN
;
1332 tmp
|= AT91_UDP_FADDEN
;
1333 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
1335 udc
->wait_for_addr_ack
= 0;
1336 VDBG("address %d\n", udc
->addr
);
1341 /* OUT packet arrived ... */
1342 else if (csr
& AT91_UDP_RX_DATA_BK0
) {
1344 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
1346 /* OUT DATA stage */
1349 if (handle_ep(ep0
)) {
1350 /* send IN/STATUS */
1351 PACKET("ep0 in/status\n");
1352 csr
= __raw_readl(creg
);
1354 csr
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
1355 __raw_writel(csr
, creg
);
1356 udc
->req_pending
= 0;
1358 } else if (udc
->req_pending
) {
1360 * AT91 hardware has a hard time with this
1361 * "deferred response" mode for control-OUT
1362 * transfers. (For control-IN it's fine.)
1364 * The normal solution leaves OUT data in the
1365 * fifo until the gadget driver is ready.
1366 * We couldn't do that here without disabling
1367 * the IRQ that tells about SETUP packets,
1368 * e.g. when the host gets impatient...
1370 * Working around it by copying into a buffer
1371 * would almost be a non-deferred response,
1372 * except that it wouldn't permit reliable
1373 * stalling of the request. Instead, demand
1374 * that gadget drivers not use this mode.
1376 DBG("no control-OUT deferred responses!\n");
1377 __raw_writel(csr
| AT91_UDP_FORCESTALL
, creg
);
1378 udc
->req_pending
= 0;
1381 /* STATUS stage for control-IN; ack. */
1383 PACKET("ep0 out/status ACK\n");
1384 __raw_writel(csr
, creg
);
1386 /* "early" status stage */
1393 static irqreturn_t
at91_udc_irq (int irq
, void *_udc
)
1395 struct at91_udc
*udc
= _udc
;
1401 status
= at91_udp_read(udc
, AT91_UDP_ISR
)
1402 & at91_udp_read(udc
, AT91_UDP_IMR
);
1406 /* USB reset irq: not maskable */
1407 if (status
& AT91_UDP_ENDBUSRES
) {
1408 at91_udp_write(udc
, AT91_UDP_IDR
, ~MINIMUS_INTERRUPTUS
);
1409 at91_udp_write(udc
, AT91_UDP_IER
, MINIMUS_INTERRUPTUS
);
1410 /* Atmel code clears this irq twice */
1411 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_ENDBUSRES
);
1412 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_ENDBUSRES
);
1413 VDBG("end bus reset\n");
1418 at91_udp_write(udc
, AT91_UDP_CSR(0),
1419 AT91_UDP_EPEDS
| AT91_UDP_EPTYPE_CTRL
);
1420 udc
->gadget
.speed
= USB_SPEED_FULL
;
1422 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_EP(0));
1425 * NOTE: this driver keeps clocks off unless the
1426 * USB host is present. That saves power, but for
1427 * boards that don't support VBUS detection, both
1428 * clocks need to be active most of the time.
1431 /* host initiated suspend (3+ms bus idle) */
1432 } else if (status
& AT91_UDP_RXSUSP
) {
1433 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXSUSP
);
1434 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_RXRSM
);
1435 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXSUSP
);
1436 // VDBG("bus suspend\n");
1442 * NOTE: when suspending a VBUS-powered device, the
1443 * gadget driver should switch into slow clock mode
1444 * and then into standby to avoid drawing more than
1445 * 500uA power (2500uA for some high-power configs).
1447 if (udc
->driver
&& udc
->driver
->suspend
)
1448 udc
->driver
->suspend(&udc
->gadget
);
1450 /* host initiated resume */
1451 } else if (status
& AT91_UDP_RXRSM
) {
1452 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXRSM
);
1453 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_RXSUSP
);
1454 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXRSM
);
1455 // VDBG("bus resume\n");
1456 if (!udc
->suspended
)
1461 * NOTE: for a VBUS-powered device, the gadget driver
1462 * would normally want to switch out of slow clock
1463 * mode into normal mode.
1465 if (udc
->driver
&& udc
->driver
->resume
)
1466 udc
->driver
->resume(&udc
->gadget
);
1468 /* endpoint IRQs are cleared by handling them */
1472 struct at91_ep
*ep
= &udc
->ep
[1];
1476 for (i
= 1; i
< NUM_ENDPOINTS
; i
++) {
1488 /*-------------------------------------------------------------------------*/
1490 static void nop_release(struct device
*dev
)
1492 /* nothing to free */
1495 static struct at91_udc controller
= {
1497 .ops
= &at91_udc_ops
,
1498 .ep0
= &controller
.ep
[0].ep
,
1499 .name
= driver_name
,
1502 .release
= nop_release
,
1508 .ops
= &at91_ep_ops
,
1517 .ops
= &at91_ep_ops
,
1527 .ops
= &at91_ep_ops
,
1536 /* could actually do bulk too */
1538 .ops
= &at91_ep_ops
,
1547 .ops
= &at91_ep_ops
,
1557 .ops
= &at91_ep_ops
,
1564 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1567 static irqreturn_t
at91_vbus_irq(int irq
, void *_udc
)
1569 struct at91_udc
*udc
= _udc
;
1572 /* vbus needs at least brief debouncing */
1574 value
= at91_get_gpio_value(udc
->board
.vbus_pin
);
1575 if (value
!= udc
->vbus
)
1576 at91_vbus_session(&udc
->gadget
, value
);
1581 int usb_gadget_register_driver (struct usb_gadget_driver
*driver
)
1583 struct at91_udc
*udc
= &controller
;
1587 || driver
->speed
< USB_SPEED_FULL
1589 || !driver
->setup
) {
1590 DBG("bad parameter.\n");
1595 DBG("UDC already has a gadget driver\n");
1599 udc
->driver
= driver
;
1600 udc
->gadget
.dev
.driver
= &driver
->driver
;
1601 udc
->gadget
.dev
.driver_data
= &driver
->driver
;
1603 udc
->selfpowered
= 1;
1605 retval
= driver
->bind(&udc
->gadget
);
1607 DBG("driver->bind() returned %d\n", retval
);
1609 udc
->gadget
.dev
.driver
= NULL
;
1610 udc
->gadget
.dev
.driver_data
= NULL
;
1612 udc
->selfpowered
= 0;
1616 local_irq_disable();
1620 DBG("bound to %s\n", driver
->driver
.name
);
1623 EXPORT_SYMBOL (usb_gadget_register_driver
);
1625 int usb_gadget_unregister_driver (struct usb_gadget_driver
*driver
)
1627 struct at91_udc
*udc
= &controller
;
1629 if (!driver
|| driver
!= udc
->driver
|| !driver
->unbind
)
1632 local_irq_disable();
1634 at91_udp_write(udc
, AT91_UDP_IDR
, ~0);
1638 driver
->unbind(&udc
->gadget
);
1641 DBG("unbound from %s\n", driver
->driver
.name
);
1644 EXPORT_SYMBOL (usb_gadget_unregister_driver
);
1646 /*-------------------------------------------------------------------------*/
1648 static void at91udc_shutdown(struct platform_device
*dev
)
1650 /* force disconnect on reboot */
1651 pullup(platform_get_drvdata(dev
), 0);
1654 static int __init
at91udc_probe(struct platform_device
*pdev
)
1656 struct device
*dev
= &pdev
->dev
;
1657 struct at91_udc
*udc
;
1659 struct resource
*res
;
1661 if (!dev
->platform_data
) {
1662 /* small (so we copy it) but critical! */
1663 DBG("missing platform_data\n");
1667 if (pdev
->num_resources
!= 2) {
1668 DBG("invalid num_resources");
1671 if ((pdev
->resource
[0].flags
!= IORESOURCE_MEM
)
1672 || (pdev
->resource
[1].flags
!= IORESOURCE_IRQ
)) {
1673 DBG("invalid resource type");
1677 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1681 if (!request_mem_region(res
->start
,
1682 res
->end
- res
->start
+ 1,
1684 DBG("someone's using UDC memory\n");
1688 /* init software state */
1690 udc
->gadget
.dev
.parent
= dev
;
1691 udc
->board
= *(struct at91_udc_data
*) dev
->platform_data
;
1695 udc
->udp_baseaddr
= ioremap(res
->start
, res
->end
- res
->start
+ 1);
1696 if (!udc
->udp_baseaddr
) {
1697 release_mem_region(res
->start
, res
->end
- res
->start
+ 1);
1703 /* get interface and function clocks */
1704 udc
->iclk
= clk_get(dev
, "udc_clk");
1705 udc
->fclk
= clk_get(dev
, "udpck");
1706 if (IS_ERR(udc
->iclk
) || IS_ERR(udc
->fclk
)) {
1707 DBG("clocks missing\n");
1712 retval
= device_register(&udc
->gadget
.dev
);
1716 /* don't do anything until we have both gadget driver and VBUS */
1717 clk_enable(udc
->iclk
);
1718 at91_udp_write(udc
, AT91_UDP_TXVC
, AT91_UDP_TXVC_TXVDIS
);
1719 at91_udp_write(udc
, AT91_UDP_IDR
, 0xffffffff);
1720 /* Clear all pending interrupts - UDP may be used by bootloader. */
1721 at91_udp_write(udc
, AT91_UDP_ICR
, 0xffffffff);
1722 clk_disable(udc
->iclk
);
1724 /* request UDC and maybe VBUS irqs */
1725 udc
->udp_irq
= platform_get_irq(pdev
, 0);
1726 if (request_irq(udc
->udp_irq
, at91_udc_irq
,
1727 IRQF_DISABLED
, driver_name
, udc
)) {
1728 DBG("request irq %d failed\n", udc
->udp_irq
);
1732 if (udc
->board
.vbus_pin
> 0) {
1734 * Get the initial state of VBUS - we cannot expect
1735 * a pending interrupt.
1737 udc
->vbus
= at91_get_gpio_value(udc
->board
.vbus_pin
);
1738 if (request_irq(udc
->board
.vbus_pin
, at91_vbus_irq
,
1739 IRQF_DISABLED
, driver_name
, udc
)) {
1740 DBG("request vbus irq %d failed\n",
1741 udc
->board
.vbus_pin
);
1742 free_irq(udc
->udp_irq
, udc
);
1747 DBG("no VBUS detection, assuming always-on\n");
1750 dev_set_drvdata(dev
, udc
);
1751 device_init_wakeup(dev
, 1);
1752 create_debug_file(udc
);
1754 INFO("%s version %s\n", driver_name
, DRIVER_VERSION
);
1758 device_unregister(&udc
->gadget
.dev
);
1760 release_mem_region(res
->start
, res
->end
- res
->start
+ 1);
1761 DBG("%s probe failed, %d\n", driver_name
, retval
);
1765 static int __exit
at91udc_remove(struct platform_device
*pdev
)
1767 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1768 struct resource
*res
;
1777 device_init_wakeup(&pdev
->dev
, 0);
1778 remove_debug_file(udc
);
1779 if (udc
->board
.vbus_pin
> 0)
1780 free_irq(udc
->board
.vbus_pin
, udc
);
1781 free_irq(udc
->udp_irq
, udc
);
1782 device_unregister(&udc
->gadget
.dev
);
1784 iounmap(udc
->udp_baseaddr
);
1785 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1786 release_mem_region(res
->start
, res
->end
- res
->start
+ 1);
1795 static int at91udc_suspend(struct platform_device
*pdev
, pm_message_t mesg
)
1797 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1798 int wake
= udc
->driver
&& device_may_wakeup(&pdev
->dev
);
1800 /* Unless we can act normally to the host (letting it wake us up
1801 * whenever it has work for us) force disconnect. Wakeup requires
1802 * PLLB for USB events (signaling for reset, wakeup, or incoming
1803 * tokens) and VBUS irqs (on systems which support them).
1805 if ((!udc
->suspended
&& udc
->addr
)
1807 || at91_suspend_entering_slow_clock()) {
1811 enable_irq_wake(udc
->udp_irq
);
1813 udc
->active_suspend
= wake
;
1814 if (udc
->board
.vbus_pin
> 0 && wake
)
1815 enable_irq_wake(udc
->board
.vbus_pin
);
1819 static int at91udc_resume(struct platform_device
*pdev
)
1821 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1823 if (udc
->board
.vbus_pin
> 0 && udc
->active_suspend
)
1824 disable_irq_wake(udc
->board
.vbus_pin
);
1826 /* maybe reconnect to host; if so, clocks on */
1827 if (udc
->active_suspend
)
1828 disable_irq_wake(udc
->udp_irq
);
1834 #define at91udc_suspend NULL
1835 #define at91udc_resume NULL
1838 static struct platform_driver at91_udc
= {
1839 .remove
= __exit_p(at91udc_remove
),
1840 .shutdown
= at91udc_shutdown
,
1841 .suspend
= at91udc_suspend
,
1842 .resume
= at91udc_resume
,
1844 .name
= (char *) driver_name
,
1845 .owner
= THIS_MODULE
,
1849 static int __init
udc_init_module(void)
1851 return platform_driver_probe(&at91_udc
, at91udc_probe
);
1853 module_init(udc_init_module
);
1855 static void __exit
udc_exit_module(void)
1857 platform_driver_unregister(&at91_udc
);
1859 module_exit(udc_exit_module
);
1861 MODULE_DESCRIPTION("AT91 udc driver");
1862 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
1863 MODULE_LICENSE("GPL");