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.
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/delay.h>
21 #include <linux/ioport.h>
22 #include <linux/slab.h>
23 #include <linux/errno.h>
24 #include <linux/init.h>
25 #include <linux/list.h>
26 #include <linux/interrupt.h>
27 #include <linux/proc_fs.h>
28 #include <linux/prefetch.h>
29 #include <linux/clk.h>
30 #include <linux/usb/ch9.h>
31 #include <linux/usb/gadget.h>
33 #include <linux/of_gpio.h>
35 #include <asm/byteorder.h>
36 #include <mach/hardware.h>
39 #include <asm/system.h>
42 #include <mach/board.h>
44 #include <mach/at91sam9261_matrix.h>
45 #include <mach/at91_matrix.h>
51 * This controller is simple and PIO-only. It's used in many AT91-series
52 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
53 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
55 * This driver expects the board has been wired with two GPIOs suppporting
56 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
57 * testing hasn't covered such cases.)
59 * The pullup is most important (so it's integrated on sam926x parts). It
60 * provides software control over whether the host enumerates the device.
62 * The VBUS sensing helps during enumeration, and allows both USB clocks
63 * (and the transceiver) to stay gated off until they're necessary, saving
64 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
65 * it may also be gated off by software during some Linux sleep states.
68 #define DRIVER_VERSION "3 May 2006"
70 static const char driver_name
[] = "at91_udc";
71 static const char ep0name
[] = "ep0";
73 #define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
75 #define at91_udp_read(udc, reg) \
76 __raw_readl((udc)->udp_baseaddr + (reg))
77 #define at91_udp_write(udc, reg, val) \
78 __raw_writel((val), (udc)->udp_baseaddr + (reg))
80 /*-------------------------------------------------------------------------*/
82 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
84 #include <linux/seq_file.h>
86 static const char debug_filename
[] = "driver/udc";
88 #define FOURBITS "%s%s%s%s"
89 #define EIGHTBITS FOURBITS FOURBITS
91 static void proc_ep_show(struct seq_file
*s
, struct at91_ep
*ep
)
93 static char *types
[] = {
94 "control", "out-iso", "out-bulk", "out-int",
95 "BOGUS", "in-iso", "in-bulk", "in-int"};
98 struct at91_request
*req
;
100 struct at91_udc
*udc
= ep
->udc
;
102 spin_lock_irqsave(&udc
->lock
, flags
);
104 csr
= __raw_readl(ep
->creg
);
106 /* NOTE: not collecting per-endpoint irq statistics... */
109 seq_printf(s
, "%s, maxpacket %d %s%s %s%s\n",
110 ep
->ep
.name
, ep
->ep
.maxpacket
,
111 ep
->is_in
? "in" : "out",
112 ep
->is_iso
? " iso" : "",
114 ? (ep
->fifo_bank
? "pong" : "ping")
116 ep
->stopped
? " stopped" : "");
117 seq_printf(s
, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS
"\n",
119 (csr
& 0x07ff0000) >> 16,
120 (csr
& (1 << 15)) ? "enabled" : "disabled",
121 (csr
& (1 << 11)) ? "DATA1" : "DATA0",
122 types
[(csr
& 0x700) >> 8],
124 /* iff type is control then print current direction */
126 ? ((csr
& (1 << 7)) ? " IN" : " OUT")
128 (csr
& (1 << 6)) ? " rxdatabk1" : "",
129 (csr
& (1 << 5)) ? " forcestall" : "",
130 (csr
& (1 << 4)) ? " txpktrdy" : "",
132 (csr
& (1 << 3)) ? " stallsent" : "",
133 (csr
& (1 << 2)) ? " rxsetup" : "",
134 (csr
& (1 << 1)) ? " rxdatabk0" : "",
135 (csr
& (1 << 0)) ? " txcomp" : "");
136 if (list_empty (&ep
->queue
))
137 seq_printf(s
, "\t(queue empty)\n");
139 else list_for_each_entry (req
, &ep
->queue
, queue
) {
140 unsigned length
= req
->req
.actual
;
142 seq_printf(s
, "\treq %p len %d/%d buf %p\n",
144 req
->req
.length
, req
->req
.buf
);
146 spin_unlock_irqrestore(&udc
->lock
, flags
);
149 static void proc_irq_show(struct seq_file
*s
, const char *label
, u32 mask
)
153 seq_printf(s
, "%s %04x:%s%s" FOURBITS
, label
, mask
,
154 (mask
& (1 << 13)) ? " wakeup" : "",
155 (mask
& (1 << 12)) ? " endbusres" : "",
157 (mask
& (1 << 11)) ? " sofint" : "",
158 (mask
& (1 << 10)) ? " extrsm" : "",
159 (mask
& (1 << 9)) ? " rxrsm" : "",
160 (mask
& (1 << 8)) ? " rxsusp" : "");
161 for (i
= 0; i
< 8; i
++) {
163 seq_printf(s
, " ep%d", i
);
168 static int proc_udc_show(struct seq_file
*s
, void *unused
)
170 struct at91_udc
*udc
= s
->private;
174 seq_printf(s
, "%s: version %s\n", driver_name
, DRIVER_VERSION
);
176 seq_printf(s
, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
177 udc
->vbus
? "present" : "off",
179 ? (udc
->vbus
? "active" : "enabled")
181 udc
->selfpowered
? "self" : "VBUS",
182 udc
->suspended
? ", suspended" : "",
183 udc
->driver
? udc
->driver
->driver
.name
: "(none)");
185 /* don't access registers when interface isn't clocked */
187 seq_printf(s
, "(not clocked)\n");
191 tmp
= at91_udp_read(udc
, AT91_UDP_FRM_NUM
);
192 seq_printf(s
, "frame %05x:%s%s frame=%d\n", tmp
,
193 (tmp
& AT91_UDP_FRM_OK
) ? " ok" : "",
194 (tmp
& AT91_UDP_FRM_ERR
) ? " err" : "",
195 (tmp
& AT91_UDP_NUM
));
197 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
198 seq_printf(s
, "glbstate %02x:%s" FOURBITS
"\n", tmp
,
199 (tmp
& AT91_UDP_RMWUPE
) ? " rmwupe" : "",
200 (tmp
& AT91_UDP_RSMINPR
) ? " rsminpr" : "",
201 (tmp
& AT91_UDP_ESR
) ? " esr" : "",
202 (tmp
& AT91_UDP_CONFG
) ? " confg" : "",
203 (tmp
& AT91_UDP_FADDEN
) ? " fadden" : "");
205 tmp
= at91_udp_read(udc
, AT91_UDP_FADDR
);
206 seq_printf(s
, "faddr %03x:%s fadd=%d\n", tmp
,
207 (tmp
& AT91_UDP_FEN
) ? " fen" : "",
208 (tmp
& AT91_UDP_FADD
));
210 proc_irq_show(s
, "imr ", at91_udp_read(udc
, AT91_UDP_IMR
));
211 proc_irq_show(s
, "isr ", at91_udp_read(udc
, AT91_UDP_ISR
));
213 if (udc
->enabled
&& udc
->vbus
) {
214 proc_ep_show(s
, &udc
->ep
[0]);
215 list_for_each_entry (ep
, &udc
->gadget
.ep_list
, ep
.ep_list
) {
223 static int proc_udc_open(struct inode
*inode
, struct file
*file
)
225 return single_open(file
, proc_udc_show
, PDE(inode
)->data
);
228 static const struct file_operations proc_ops
= {
229 .owner
= THIS_MODULE
,
230 .open
= proc_udc_open
,
233 .release
= single_release
,
236 static void create_debug_file(struct at91_udc
*udc
)
238 udc
->pde
= proc_create_data(debug_filename
, 0, NULL
, &proc_ops
, udc
);
241 static void remove_debug_file(struct at91_udc
*udc
)
244 remove_proc_entry(debug_filename
, NULL
);
249 static inline void create_debug_file(struct at91_udc
*udc
) {}
250 static inline void remove_debug_file(struct at91_udc
*udc
) {}
255 /*-------------------------------------------------------------------------*/
257 static void done(struct at91_ep
*ep
, struct at91_request
*req
, int status
)
259 unsigned stopped
= ep
->stopped
;
260 struct at91_udc
*udc
= ep
->udc
;
262 list_del_init(&req
->queue
);
263 if (req
->req
.status
== -EINPROGRESS
)
264 req
->req
.status
= status
;
266 status
= req
->req
.status
;
267 if (status
&& status
!= -ESHUTDOWN
)
268 VDBG("%s done %p, status %d\n", ep
->ep
.name
, req
, status
);
271 spin_unlock(&udc
->lock
);
272 req
->req
.complete(&ep
->ep
, &req
->req
);
273 spin_lock(&udc
->lock
);
274 ep
->stopped
= stopped
;
276 /* ep0 is always ready; other endpoints need a non-empty queue */
277 if (list_empty(&ep
->queue
) && ep
->int_mask
!= (1 << 0))
278 at91_udp_write(udc
, AT91_UDP_IDR
, ep
->int_mask
);
281 /*-------------------------------------------------------------------------*/
283 /* bits indicating OUT fifo has data ready */
284 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
287 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
288 * back most of the value you just read (because of side effects, including
289 * bits that may change after reading and before writing).
291 * Except when changing a specific bit, always write values which:
292 * - clear SET_FX bits (setting them could change something)
293 * - set CLR_FX bits (clearing them could change something)
295 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
296 * that shouldn't normally be changed.
298 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
299 * implying a need to wait for one write to complete (test relevant bits)
300 * before starting the next write. This shouldn't be an issue given how
301 * infrequently we write, except maybe for write-then-read idioms.
303 #define SET_FX (AT91_UDP_TXPKTRDY)
304 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
305 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
307 /* pull OUT packet data from the endpoint's fifo */
308 static int read_fifo (struct at91_ep
*ep
, struct at91_request
*req
)
310 u32 __iomem
*creg
= ep
->creg
;
311 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
314 unsigned int count
, bufferspace
, is_done
;
316 buf
= req
->req
.buf
+ req
->req
.actual
;
317 bufferspace
= req
->req
.length
- req
->req
.actual
;
320 * there might be nothing to read if ep_queue() calls us,
321 * or if we already emptied both pingpong buffers
324 csr
= __raw_readl(creg
);
325 if ((csr
& RX_DATA_READY
) == 0)
328 count
= (csr
& AT91_UDP_RXBYTECNT
) >> 16;
329 if (count
> ep
->ep
.maxpacket
)
330 count
= ep
->ep
.maxpacket
;
331 if (count
> bufferspace
) {
332 DBG("%s buffer overflow\n", ep
->ep
.name
);
333 req
->req
.status
= -EOVERFLOW
;
336 __raw_readsb(dreg
, buf
, count
);
338 /* release and swap pingpong mem bank */
340 if (ep
->is_pingpong
) {
341 if (ep
->fifo_bank
== 0) {
342 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
345 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK1
);
349 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
350 __raw_writel(csr
, creg
);
352 req
->req
.actual
+= count
;
353 is_done
= (count
< ep
->ep
.maxpacket
);
354 if (count
== bufferspace
)
357 PACKET("%s %p out/%d%s\n", ep
->ep
.name
, &req
->req
, count
,
358 is_done
? " (done)" : "");
361 * avoid extra trips through IRQ logic for packets already in
362 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
366 else if (ep
->is_pingpong
) {
368 * One dummy read to delay the code because of a HW glitch:
369 * CSR returns bad RXCOUNT when read too soon after updating
372 csr
= __raw_readl(creg
);
374 bufferspace
-= count
;
382 /* load fifo for an IN packet */
383 static int write_fifo(struct at91_ep
*ep
, struct at91_request
*req
)
385 u32 __iomem
*creg
= ep
->creg
;
386 u32 csr
= __raw_readl(creg
);
387 u8 __iomem
*dreg
= ep
->creg
+ (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
388 unsigned total
, count
, is_last
;
392 * TODO: allow for writing two packets to the fifo ... that'll
393 * reduce the amount of IN-NAKing, but probably won't affect
394 * throughput much. (Unlike preventing OUT-NAKing!)
398 * If ep_queue() calls us, the queue is empty and possibly in
399 * odd states like TXCOMP not yet cleared (we do it, saving at
400 * least one IRQ) or the fifo not yet being free. Those aren't
401 * issues normally (IRQ handler fast path).
403 if (unlikely(csr
& (AT91_UDP_TXCOMP
| AT91_UDP_TXPKTRDY
))) {
404 if (csr
& AT91_UDP_TXCOMP
) {
406 csr
&= ~(SET_FX
| AT91_UDP_TXCOMP
);
407 __raw_writel(csr
, creg
);
408 csr
= __raw_readl(creg
);
410 if (csr
& AT91_UDP_TXPKTRDY
)
414 buf
= req
->req
.buf
+ req
->req
.actual
;
416 total
= req
->req
.length
- req
->req
.actual
;
417 if (ep
->ep
.maxpacket
< total
) {
418 count
= ep
->ep
.maxpacket
;
422 is_last
= (count
< ep
->ep
.maxpacket
) || !req
->req
.zero
;
426 * Write the packet, maybe it's a ZLP.
428 * NOTE: incrementing req->actual before we receive the ACK means
429 * gadget driver IN bytecounts can be wrong in fault cases. That's
430 * fixable with PIO drivers like this one (save "count" here, and
431 * do the increment later on TX irq), but not for most DMA hardware.
433 * So all gadget drivers must accept that potential error. Some
434 * hardware supports precise fifo status reporting, letting them
435 * recover when the actual bytecount matters (e.g. for USB Test
436 * and Measurement Class devices).
438 __raw_writesb(dreg
, buf
, count
);
440 csr
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
441 __raw_writel(csr
, creg
);
442 req
->req
.actual
+= count
;
444 PACKET("%s %p in/%d%s\n", ep
->ep
.name
, &req
->req
, count
,
445 is_last
? " (done)" : "");
451 static void nuke(struct at91_ep
*ep
, int status
)
453 struct at91_request
*req
;
455 /* terminate any request in the queue */
457 if (list_empty(&ep
->queue
))
460 VDBG("%s %s\n", __func__
, ep
->ep
.name
);
461 while (!list_empty(&ep
->queue
)) {
462 req
= list_entry(ep
->queue
.next
, struct at91_request
, queue
);
463 done(ep
, req
, status
);
467 /*-------------------------------------------------------------------------*/
469 static int at91_ep_enable(struct usb_ep
*_ep
,
470 const struct usb_endpoint_descriptor
*desc
)
472 struct at91_ep
*ep
= container_of(_ep
, struct at91_ep
, ep
);
473 struct at91_udc
*udc
= ep
->udc
;
480 || _ep
->name
== ep0name
481 || desc
->bDescriptorType
!= USB_DT_ENDPOINT
482 || (maxpacket
= usb_endpoint_maxp(desc
)) == 0
483 || maxpacket
> ep
->maxpacket
) {
484 DBG("bad ep or descriptor\n");
488 if (!udc
->driver
|| udc
->gadget
.speed
== USB_SPEED_UNKNOWN
) {
489 DBG("bogus device state\n");
493 tmp
= usb_endpoint_type(desc
);
495 case USB_ENDPOINT_XFER_CONTROL
:
496 DBG("only one control endpoint\n");
498 case USB_ENDPOINT_XFER_INT
:
502 case USB_ENDPOINT_XFER_BULK
:
511 DBG("bogus maxpacket %d\n", maxpacket
);
513 case USB_ENDPOINT_XFER_ISOC
:
514 if (!ep
->is_pingpong
) {
515 DBG("iso requires double buffering\n");
522 spin_lock_irqsave(&udc
->lock
, flags
);
524 /* initialize endpoint to match this descriptor */
525 ep
->is_in
= usb_endpoint_dir_in(desc
);
526 ep
->is_iso
= (tmp
== USB_ENDPOINT_XFER_ISOC
);
531 tmp
|= AT91_UDP_EPEDS
;
532 __raw_writel(tmp
, ep
->creg
);
535 ep
->ep
.maxpacket
= maxpacket
;
538 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
539 * since endpoint resets don't reset hw pingpong state.
541 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
542 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
544 spin_unlock_irqrestore(&udc
->lock
, flags
);
548 static int at91_ep_disable (struct usb_ep
* _ep
)
550 struct at91_ep
*ep
= container_of(_ep
, struct at91_ep
, ep
);
551 struct at91_udc
*udc
= ep
->udc
;
554 if (ep
== &ep
->udc
->ep
[0])
557 spin_lock_irqsave(&udc
->lock
, flags
);
559 nuke(ep
, -ESHUTDOWN
);
561 /* 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 spin_unlock_irqrestore(&udc
->lock
, 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
, gfp_t 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 int at91_ep_queue(struct usb_ep
*_ep
,
605 struct usb_request
*_req
, gfp_t gfp_flags
)
607 struct at91_request
*req
;
609 struct at91_udc
*udc
;
613 req
= container_of(_req
, struct at91_request
, req
);
614 ep
= container_of(_ep
, struct at91_ep
, ep
);
616 if (!_req
|| !_req
->complete
617 || !_req
->buf
|| !list_empty(&req
->queue
)) {
618 DBG("invalid request\n");
622 if (!_ep
|| (!ep
->desc
&& ep
->ep
.name
!= ep0name
)) {
629 if (!udc
|| !udc
->driver
|| udc
->gadget
.speed
== USB_SPEED_UNKNOWN
) {
630 DBG("invalid device\n");
634 _req
->status
= -EINPROGRESS
;
637 spin_lock_irqsave(&udc
->lock
, flags
);
639 /* try to kickstart any empty and idle queue */
640 if (list_empty(&ep
->queue
) && !ep
->stopped
) {
644 * If this control request has a non-empty DATA stage, this
645 * will start that stage. It works just like a non-control
646 * request (until the status stage starts, maybe early).
648 * If the data stage is empty, then this starts a successful
649 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
651 is_ep0
= (ep
->ep
.name
== ep0name
);
655 if (!udc
->req_pending
) {
661 * defer changing CONFG until after the gadget driver
662 * reconfigures the endpoints.
664 if (udc
->wait_for_config_ack
) {
665 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
666 tmp
^= AT91_UDP_CONFG
;
667 VDBG("toggle config\n");
668 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
670 if (req
->req
.length
== 0) {
672 PACKET("ep0 in/status\n");
674 tmp
= __raw_readl(ep
->creg
);
676 tmp
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
677 __raw_writel(tmp
, ep
->creg
);
678 udc
->req_pending
= 0;
684 status
= write_fifo(ep
, req
);
686 status
= read_fifo(ep
, req
);
688 /* IN/STATUS stage is otherwise triggered by irq */
689 if (status
&& is_ep0
)
695 if (req
&& !status
) {
696 list_add_tail (&req
->queue
, &ep
->queue
);
697 at91_udp_write(udc
, AT91_UDP_IER
, ep
->int_mask
);
700 spin_unlock_irqrestore(&udc
->lock
, flags
);
701 return (status
< 0) ? status
: 0;
704 static int at91_ep_dequeue(struct usb_ep
*_ep
, struct usb_request
*_req
)
707 struct at91_request
*req
;
709 struct at91_udc
*udc
;
711 ep
= container_of(_ep
, struct at91_ep
, ep
);
712 if (!_ep
|| ep
->ep
.name
== ep0name
)
717 spin_lock_irqsave(&udc
->lock
, flags
);
719 /* make sure it's actually queued on this endpoint */
720 list_for_each_entry (req
, &ep
->queue
, queue
) {
721 if (&req
->req
== _req
)
724 if (&req
->req
!= _req
) {
725 spin_unlock_irqrestore(&udc
->lock
, flags
);
729 done(ep
, req
, -ECONNRESET
);
730 spin_unlock_irqrestore(&udc
->lock
, flags
);
734 static int at91_ep_set_halt(struct usb_ep
*_ep
, int value
)
736 struct at91_ep
*ep
= container_of(_ep
, struct at91_ep
, ep
);
737 struct at91_udc
*udc
= ep
->udc
;
743 if (!_ep
|| ep
->is_iso
|| !ep
->udc
->clocked
)
747 spin_lock_irqsave(&udc
->lock
, flags
);
749 csr
= __raw_readl(creg
);
752 * fail with still-busy IN endpoints, ensuring correct sequencing
753 * of data tx then stall. note that the fifo rx bytecount isn't
754 * completely accurate as a tx bytecount.
756 if (ep
->is_in
&& (!list_empty(&ep
->queue
) || (csr
>> 16) != 0))
762 csr
|= AT91_UDP_FORCESTALL
;
763 VDBG("halt %s\n", ep
->ep
.name
);
765 at91_udp_write(udc
, AT91_UDP_RST_EP
, ep
->int_mask
);
766 at91_udp_write(udc
, AT91_UDP_RST_EP
, 0);
767 csr
&= ~AT91_UDP_FORCESTALL
;
769 __raw_writel(csr
, creg
);
772 spin_unlock_irqrestore(&udc
->lock
, flags
);
776 static const struct usb_ep_ops at91_ep_ops
= {
777 .enable
= at91_ep_enable
,
778 .disable
= at91_ep_disable
,
779 .alloc_request
= at91_ep_alloc_request
,
780 .free_request
= at91_ep_free_request
,
781 .queue
= at91_ep_queue
,
782 .dequeue
= at91_ep_dequeue
,
783 .set_halt
= at91_ep_set_halt
,
784 /* there's only imprecise fifo status reporting */
787 /*-------------------------------------------------------------------------*/
789 static int at91_get_frame(struct usb_gadget
*gadget
)
791 struct at91_udc
*udc
= to_udc(gadget
);
793 if (!to_udc(gadget
)->clocked
)
795 return at91_udp_read(udc
, AT91_UDP_FRM_NUM
) & AT91_UDP_NUM
;
798 static int at91_wakeup(struct usb_gadget
*gadget
)
800 struct at91_udc
*udc
= to_udc(gadget
);
802 int status
= -EINVAL
;
805 DBG("%s\n", __func__
);
806 spin_lock_irqsave(&udc
->lock
, flags
);
808 if (!udc
->clocked
|| !udc
->suspended
)
811 /* NOTE: some "early versions" handle ESR differently ... */
813 glbstate
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
814 if (!(glbstate
& AT91_UDP_ESR
))
816 glbstate
|= AT91_UDP_ESR
;
817 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, glbstate
);
820 spin_unlock_irqrestore(&udc
->lock
, flags
);
824 /* reinit == restore initial software state */
825 static void udc_reinit(struct at91_udc
*udc
)
829 INIT_LIST_HEAD(&udc
->gadget
.ep_list
);
830 INIT_LIST_HEAD(&udc
->gadget
.ep0
->ep_list
);
832 for (i
= 0; i
< NUM_ENDPOINTS
; i
++) {
833 struct at91_ep
*ep
= &udc
->ep
[i
];
836 list_add_tail(&ep
->ep
.ep_list
, &udc
->gadget
.ep_list
);
840 ep
->ep
.maxpacket
= ep
->maxpacket
;
841 ep
->creg
= (void __iomem
*) udc
->udp_baseaddr
+ AT91_UDP_CSR(i
);
842 /* initialize one queue per endpoint */
843 INIT_LIST_HEAD(&ep
->queue
);
847 static void stop_activity(struct at91_udc
*udc
)
849 struct usb_gadget_driver
*driver
= udc
->driver
;
852 if (udc
->gadget
.speed
== USB_SPEED_UNKNOWN
)
854 udc
->gadget
.speed
= USB_SPEED_UNKNOWN
;
857 for (i
= 0; i
< NUM_ENDPOINTS
; i
++) {
858 struct at91_ep
*ep
= &udc
->ep
[i
];
860 nuke(ep
, -ESHUTDOWN
);
863 spin_unlock(&udc
->lock
);
864 driver
->disconnect(&udc
->gadget
);
865 spin_lock(&udc
->lock
);
871 static void clk_on(struct at91_udc
*udc
)
876 clk_enable(udc
->iclk
);
877 clk_enable(udc
->fclk
);
880 static void clk_off(struct at91_udc
*udc
)
885 udc
->gadget
.speed
= USB_SPEED_UNKNOWN
;
886 clk_disable(udc
->fclk
);
887 clk_disable(udc
->iclk
);
891 * activate/deactivate link with host; minimize power usage for
892 * inactive links by cutting clocks and transceiver power.
894 static void pullup(struct at91_udc
*udc
, int is_on
)
896 int active
= !udc
->board
.pullup_active_low
;
898 if (!udc
->enabled
|| !udc
->vbus
)
900 DBG("%sactive\n", is_on
? "" : "in");
904 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXRSM
);
905 at91_udp_write(udc
, AT91_UDP_TXVC
, 0);
906 if (cpu_is_at91rm9200())
907 gpio_set_value(udc
->board
.pullup_pin
, active
);
908 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
909 u32 txvc
= at91_udp_read(udc
, AT91_UDP_TXVC
);
911 txvc
|= AT91_UDP_TXVC_PUON
;
912 at91_udp_write(udc
, AT91_UDP_TXVC
, txvc
);
913 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
916 usbpucr
= at91_matrix_read(AT91_MATRIX_USBPUCR
);
917 usbpucr
|= AT91_MATRIX_USBPUCR_PUON
;
918 at91_matrix_write(AT91_MATRIX_USBPUCR
, usbpucr
);
922 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXRSM
);
923 at91_udp_write(udc
, AT91_UDP_TXVC
, AT91_UDP_TXVC_TXVDIS
);
924 if (cpu_is_at91rm9200())
925 gpio_set_value(udc
->board
.pullup_pin
, !active
);
926 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
927 u32 txvc
= at91_udp_read(udc
, AT91_UDP_TXVC
);
929 txvc
&= ~AT91_UDP_TXVC_PUON
;
930 at91_udp_write(udc
, AT91_UDP_TXVC
, txvc
);
931 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
934 usbpucr
= at91_matrix_read(AT91_MATRIX_USBPUCR
);
935 usbpucr
&= ~AT91_MATRIX_USBPUCR_PUON
;
936 at91_matrix_write(AT91_MATRIX_USBPUCR
, usbpucr
);
942 /* vbus is here! turn everything on that's ready */
943 static int at91_vbus_session(struct usb_gadget
*gadget
, int is_active
)
945 struct at91_udc
*udc
= to_udc(gadget
);
948 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
949 spin_lock_irqsave(&udc
->lock
, flags
);
950 udc
->vbus
= (is_active
!= 0);
952 pullup(udc
, is_active
);
955 spin_unlock_irqrestore(&udc
->lock
, flags
);
959 static int at91_pullup(struct usb_gadget
*gadget
, int is_on
)
961 struct at91_udc
*udc
= to_udc(gadget
);
964 spin_lock_irqsave(&udc
->lock
, flags
);
965 udc
->enabled
= is_on
= !!is_on
;
967 spin_unlock_irqrestore(&udc
->lock
, flags
);
971 static int at91_set_selfpowered(struct usb_gadget
*gadget
, int is_on
)
973 struct at91_udc
*udc
= to_udc(gadget
);
976 spin_lock_irqsave(&udc
->lock
, flags
);
977 udc
->selfpowered
= (is_on
!= 0);
978 spin_unlock_irqrestore(&udc
->lock
, flags
);
982 static int at91_start(struct usb_gadget_driver
*driver
,
983 int (*bind
)(struct usb_gadget
*));
984 static int at91_stop(struct usb_gadget_driver
*driver
);
986 static const struct usb_gadget_ops at91_udc_ops
= {
987 .get_frame
= at91_get_frame
,
988 .wakeup
= at91_wakeup
,
989 .set_selfpowered
= at91_set_selfpowered
,
990 .vbus_session
= at91_vbus_session
,
991 .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 spin_unlock(&udc
->lock
);
1248 status
= udc
->driver
->setup(&udc
->gadget
, &pkt
.r
);
1249 spin_lock(&udc
->lock
);
1255 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1256 pkt
.r
.bRequestType
, pkt
.r
.bRequest
, status
);
1257 csr
|= AT91_UDP_FORCESTALL
;
1258 __raw_writel(csr
, creg
);
1259 udc
->req_pending
= 0;
1264 /* immediate successful (IN) STATUS after zero length DATA */
1265 PACKET("ep0 in/status\n");
1267 csr
|= AT91_UDP_TXPKTRDY
;
1268 __raw_writel(csr
, creg
);
1269 udc
->req_pending
= 0;
1272 static void handle_ep0(struct at91_udc
*udc
)
1274 struct at91_ep
*ep0
= &udc
->ep
[0];
1275 u32 __iomem
*creg
= ep0
->creg
;
1276 u32 csr
= __raw_readl(creg
);
1277 struct at91_request
*req
;
1279 if (unlikely(csr
& AT91_UDP_STALLSENT
)) {
1281 udc
->req_pending
= 0;
1283 csr
&= ~(SET_FX
| AT91_UDP_STALLSENT
| AT91_UDP_FORCESTALL
);
1284 __raw_writel(csr
, creg
);
1285 VDBG("ep0 stalled\n");
1286 csr
= __raw_readl(creg
);
1288 if (csr
& AT91_UDP_RXSETUP
) {
1290 udc
->req_pending
= 0;
1291 handle_setup(udc
, ep0
, csr
);
1295 if (list_empty(&ep0
->queue
))
1298 req
= list_entry(ep0
->queue
.next
, struct at91_request
, queue
);
1300 /* host ACKed an IN packet that we sent */
1301 if (csr
& AT91_UDP_TXCOMP
) {
1303 csr
&= ~(SET_FX
| AT91_UDP_TXCOMP
);
1305 /* write more IN DATA? */
1306 if (req
&& ep0
->is_in
) {
1308 udc
->req_pending
= 0;
1312 * - last IN DATA packet (including GET_STATUS)
1313 * - IN/STATUS for OUT DATA
1314 * - IN/STATUS for any zero-length DATA stage
1315 * except for the IN DATA case, the host should send
1316 * an OUT status later, which we'll ack.
1319 udc
->req_pending
= 0;
1320 __raw_writel(csr
, creg
);
1323 * SET_ADDRESS takes effect only after the STATUS
1324 * (to the original address) gets acked.
1326 if (udc
->wait_for_addr_ack
) {
1329 at91_udp_write(udc
, AT91_UDP_FADDR
,
1330 AT91_UDP_FEN
| udc
->addr
);
1331 tmp
= at91_udp_read(udc
, AT91_UDP_GLB_STAT
);
1332 tmp
&= ~AT91_UDP_FADDEN
;
1334 tmp
|= AT91_UDP_FADDEN
;
1335 at91_udp_write(udc
, AT91_UDP_GLB_STAT
, tmp
);
1337 udc
->wait_for_addr_ack
= 0;
1338 VDBG("address %d\n", udc
->addr
);
1343 /* OUT packet arrived ... */
1344 else if (csr
& AT91_UDP_RX_DATA_BK0
) {
1346 csr
&= ~(SET_FX
| AT91_UDP_RX_DATA_BK0
);
1348 /* OUT DATA stage */
1351 if (handle_ep(ep0
)) {
1352 /* send IN/STATUS */
1353 PACKET("ep0 in/status\n");
1354 csr
= __raw_readl(creg
);
1356 csr
|= CLR_FX
| AT91_UDP_TXPKTRDY
;
1357 __raw_writel(csr
, creg
);
1358 udc
->req_pending
= 0;
1360 } else if (udc
->req_pending
) {
1362 * AT91 hardware has a hard time with this
1363 * "deferred response" mode for control-OUT
1364 * transfers. (For control-IN it's fine.)
1366 * The normal solution leaves OUT data in the
1367 * fifo until the gadget driver is ready.
1368 * We couldn't do that here without disabling
1369 * the IRQ that tells about SETUP packets,
1370 * e.g. when the host gets impatient...
1372 * Working around it by copying into a buffer
1373 * would almost be a non-deferred response,
1374 * except that it wouldn't permit reliable
1375 * stalling of the request. Instead, demand
1376 * that gadget drivers not use this mode.
1378 DBG("no control-OUT deferred responses!\n");
1379 __raw_writel(csr
| AT91_UDP_FORCESTALL
, creg
);
1380 udc
->req_pending
= 0;
1383 /* STATUS stage for control-IN; ack. */
1385 PACKET("ep0 out/status ACK\n");
1386 __raw_writel(csr
, creg
);
1388 /* "early" status stage */
1395 static irqreturn_t
at91_udc_irq (int irq
, void *_udc
)
1397 struct at91_udc
*udc
= _udc
;
1399 int disable_clock
= 0;
1400 unsigned long flags
;
1402 spin_lock_irqsave(&udc
->lock
, flags
);
1404 if (!udc
->clocked
) {
1412 status
= at91_udp_read(udc
, AT91_UDP_ISR
)
1413 & at91_udp_read(udc
, AT91_UDP_IMR
);
1417 /* USB reset irq: not maskable */
1418 if (status
& AT91_UDP_ENDBUSRES
) {
1419 at91_udp_write(udc
, AT91_UDP_IDR
, ~MINIMUS_INTERRUPTUS
);
1420 at91_udp_write(udc
, AT91_UDP_IER
, MINIMUS_INTERRUPTUS
);
1421 /* Atmel code clears this irq twice */
1422 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_ENDBUSRES
);
1423 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_ENDBUSRES
);
1424 VDBG("end bus reset\n");
1429 at91_udp_write(udc
, AT91_UDP_CSR(0),
1430 AT91_UDP_EPEDS
| AT91_UDP_EPTYPE_CTRL
);
1431 udc
->gadget
.speed
= USB_SPEED_FULL
;
1433 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_EP(0));
1436 * NOTE: this driver keeps clocks off unless the
1437 * USB host is present. That saves power, but for
1438 * boards that don't support VBUS detection, both
1439 * clocks need to be active most of the time.
1442 /* host initiated suspend (3+ms bus idle) */
1443 } else if (status
& AT91_UDP_RXSUSP
) {
1444 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXSUSP
);
1445 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_RXRSM
);
1446 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXSUSP
);
1447 /* VDBG("bus suspend\n"); */
1453 * NOTE: when suspending a VBUS-powered device, the
1454 * gadget driver should switch into slow clock mode
1455 * and then into standby to avoid drawing more than
1456 * 500uA power (2500uA for some high-power configs).
1458 if (udc
->driver
&& udc
->driver
->suspend
) {
1459 spin_unlock(&udc
->lock
);
1460 udc
->driver
->suspend(&udc
->gadget
);
1461 spin_lock(&udc
->lock
);
1464 /* host initiated resume */
1465 } else if (status
& AT91_UDP_RXRSM
) {
1466 at91_udp_write(udc
, AT91_UDP_IDR
, AT91_UDP_RXRSM
);
1467 at91_udp_write(udc
, AT91_UDP_IER
, AT91_UDP_RXSUSP
);
1468 at91_udp_write(udc
, AT91_UDP_ICR
, AT91_UDP_RXRSM
);
1469 /* VDBG("bus resume\n"); */
1470 if (!udc
->suspended
)
1475 * NOTE: for a VBUS-powered device, the gadget driver
1476 * would normally want to switch out of slow clock
1477 * mode into normal mode.
1479 if (udc
->driver
&& udc
->driver
->resume
) {
1480 spin_unlock(&udc
->lock
);
1481 udc
->driver
->resume(&udc
->gadget
);
1482 spin_lock(&udc
->lock
);
1485 /* endpoint IRQs are cleared by handling them */
1489 struct at91_ep
*ep
= &udc
->ep
[1];
1493 for (i
= 1; i
< NUM_ENDPOINTS
; i
++) {
1505 spin_unlock_irqrestore(&udc
->lock
, flags
);
1510 /*-------------------------------------------------------------------------*/
1512 static void nop_release(struct device
*dev
)
1514 /* nothing to free */
1517 static struct at91_udc controller
= {
1519 .ops
= &at91_udc_ops
,
1520 .ep0
= &controller
.ep
[0].ep
,
1521 .name
= driver_name
,
1523 .init_name
= "gadget",
1524 .release
= nop_release
,
1530 .ops
= &at91_ep_ops
,
1539 .ops
= &at91_ep_ops
,
1549 .ops
= &at91_ep_ops
,
1558 /* could actually do bulk too */
1560 .ops
= &at91_ep_ops
,
1569 .ops
= &at91_ep_ops
,
1579 .ops
= &at91_ep_ops
,
1586 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1589 static void at91_vbus_update(struct at91_udc
*udc
, unsigned value
)
1591 value
^= udc
->board
.vbus_active_low
;
1592 if (value
!= udc
->vbus
)
1593 at91_vbus_session(&udc
->gadget
, value
);
1596 static irqreturn_t
at91_vbus_irq(int irq
, void *_udc
)
1598 struct at91_udc
*udc
= _udc
;
1600 /* vbus needs at least brief debouncing */
1602 at91_vbus_update(udc
, gpio_get_value(udc
->board
.vbus_pin
));
1607 static void at91_vbus_timer_work(struct work_struct
*work
)
1609 struct at91_udc
*udc
= container_of(work
, struct at91_udc
,
1612 at91_vbus_update(udc
, gpio_get_value_cansleep(udc
->board
.vbus_pin
));
1614 if (!timer_pending(&udc
->vbus_timer
))
1615 mod_timer(&udc
->vbus_timer
, jiffies
+ VBUS_POLL_TIMEOUT
);
1618 static void at91_vbus_timer(unsigned long data
)
1620 struct at91_udc
*udc
= (struct at91_udc
*)data
;
1623 * If we are polling vbus it is likely that the gpio is on an
1624 * bus such as i2c or spi which may sleep, so schedule some work
1625 * to read the vbus gpio
1627 if (!work_pending(&udc
->vbus_timer_work
))
1628 schedule_work(&udc
->vbus_timer_work
);
1631 static int at91_start(struct usb_gadget_driver
*driver
,
1632 int (*bind
)(struct usb_gadget
*))
1634 struct at91_udc
*udc
= &controller
;
1636 unsigned long flags
;
1639 || driver
->max_speed
< USB_SPEED_FULL
1641 || !driver
->setup
) {
1642 DBG("bad parameter.\n");
1647 DBG("UDC already has a gadget driver\n");
1651 udc
->driver
= driver
;
1652 udc
->gadget
.dev
.driver
= &driver
->driver
;
1653 dev_set_drvdata(&udc
->gadget
.dev
, &driver
->driver
);
1655 udc
->selfpowered
= 1;
1657 retval
= bind(&udc
->gadget
);
1659 DBG("bind() returned %d\n", retval
);
1661 udc
->gadget
.dev
.driver
= NULL
;
1662 dev_set_drvdata(&udc
->gadget
.dev
, NULL
);
1664 udc
->selfpowered
= 0;
1668 spin_lock_irqsave(&udc
->lock
, flags
);
1670 spin_unlock_irqrestore(&udc
->lock
, flags
);
1672 DBG("bound to %s\n", driver
->driver
.name
);
1676 static int at91_stop(struct usb_gadget_driver
*driver
)
1678 struct at91_udc
*udc
= &controller
;
1679 unsigned long flags
;
1681 if (!driver
|| driver
!= udc
->driver
|| !driver
->unbind
)
1684 spin_lock_irqsave(&udc
->lock
, flags
);
1686 at91_udp_write(udc
, AT91_UDP_IDR
, ~0);
1688 spin_unlock_irqrestore(&udc
->lock
, flags
);
1690 driver
->unbind(&udc
->gadget
);
1691 udc
->gadget
.dev
.driver
= NULL
;
1692 dev_set_drvdata(&udc
->gadget
.dev
, NULL
);
1695 DBG("unbound from %s\n", driver
->driver
.name
);
1699 /*-------------------------------------------------------------------------*/
1701 static void at91udc_shutdown(struct platform_device
*dev
)
1703 struct at91_udc
*udc
= platform_get_drvdata(dev
);
1704 unsigned long flags
;
1706 /* force disconnect on reboot */
1707 spin_lock_irqsave(&udc
->lock
, flags
);
1708 pullup(platform_get_drvdata(dev
), 0);
1709 spin_unlock_irqrestore(&udc
->lock
, flags
);
1712 static void __devinit
at91udc_of_init(struct at91_udc
*udc
,
1713 struct device_node
*np
)
1715 struct at91_udc_data
*board
= &udc
->board
;
1717 enum of_gpio_flags flags
;
1719 if (of_property_read_u32(np
, "atmel,vbus-polled", &val
) == 0)
1720 board
->vbus_polled
= 1;
1722 board
->vbus_pin
= of_get_named_gpio_flags(np
, "atmel,vbus-gpio", 0,
1724 board
->vbus_active_low
= (flags
& OF_GPIO_ACTIVE_LOW
) ? 1 : 0;
1726 board
->pullup_pin
= of_get_named_gpio_flags(np
, "atmel,pullup-gpio", 0,
1729 board
->pullup_active_low
= (flags
& OF_GPIO_ACTIVE_LOW
) ? 1 : 0;
1732 static int __devinit
at91udc_probe(struct platform_device
*pdev
)
1734 struct device
*dev
= &pdev
->dev
;
1735 struct at91_udc
*udc
;
1737 struct resource
*res
;
1739 if (!dev
->platform_data
) {
1740 /* small (so we copy it) but critical! */
1741 DBG("missing platform_data\n");
1745 if (pdev
->num_resources
!= 2) {
1746 DBG("invalid num_resources\n");
1749 if ((pdev
->resource
[0].flags
!= IORESOURCE_MEM
)
1750 || (pdev
->resource
[1].flags
!= IORESOURCE_IRQ
)) {
1751 DBG("invalid resource type\n");
1755 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1759 if (!request_mem_region(res
->start
, resource_size(res
), driver_name
)) {
1760 DBG("someone's using UDC memory\n");
1764 /* init software state */
1766 udc
->gadget
.dev
.parent
= dev
;
1767 if (pdev
->dev
.of_node
)
1768 at91udc_of_init(udc
, pdev
->dev
.of_node
);
1770 memcpy(&udc
->board
, dev
->platform_data
,
1771 sizeof(struct at91_udc_data
));
1774 spin_lock_init(&udc
->lock
);
1776 /* rm9200 needs manual D+ pullup; off by default */
1777 if (cpu_is_at91rm9200()) {
1778 if (gpio_is_valid(udc
->board
.pullup_pin
)) {
1779 DBG("no D+ pullup?\n");
1783 retval
= gpio_request(udc
->board
.pullup_pin
, "udc_pullup");
1785 DBG("D+ pullup is busy\n");
1788 gpio_direction_output(udc
->board
.pullup_pin
,
1789 udc
->board
.pullup_active_low
);
1792 /* newer chips have more FIFO memory than rm9200 */
1793 if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
1794 udc
->ep
[0].maxpacket
= 64;
1795 udc
->ep
[3].maxpacket
= 64;
1796 udc
->ep
[4].maxpacket
= 512;
1797 udc
->ep
[5].maxpacket
= 512;
1798 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1799 udc
->ep
[3].maxpacket
= 64;
1800 } else if (cpu_is_at91sam9263()) {
1801 udc
->ep
[0].maxpacket
= 64;
1802 udc
->ep
[3].maxpacket
= 64;
1805 udc
->udp_baseaddr
= ioremap(res
->start
, resource_size(res
));
1806 if (!udc
->udp_baseaddr
) {
1813 /* get interface and function clocks */
1814 udc
->iclk
= clk_get(dev
, "udc_clk");
1815 udc
->fclk
= clk_get(dev
, "udpck");
1816 if (IS_ERR(udc
->iclk
) || IS_ERR(udc
->fclk
)) {
1817 DBG("clocks missing\n");
1819 /* NOTE: we "know" here that refcounts on these are NOPs */
1823 retval
= device_register(&udc
->gadget
.dev
);
1825 put_device(&udc
->gadget
.dev
);
1829 /* don't do anything until we have both gadget driver and VBUS */
1830 clk_enable(udc
->iclk
);
1831 at91_udp_write(udc
, AT91_UDP_TXVC
, AT91_UDP_TXVC_TXVDIS
);
1832 at91_udp_write(udc
, AT91_UDP_IDR
, 0xffffffff);
1833 /* Clear all pending interrupts - UDP may be used by bootloader. */
1834 at91_udp_write(udc
, AT91_UDP_ICR
, 0xffffffff);
1835 clk_disable(udc
->iclk
);
1837 /* request UDC and maybe VBUS irqs */
1838 udc
->udp_irq
= platform_get_irq(pdev
, 0);
1839 retval
= request_irq(udc
->udp_irq
, at91_udc_irq
,
1840 0, driver_name
, udc
);
1842 DBG("request irq %d failed\n", udc
->udp_irq
);
1845 if (gpio_is_valid(udc
->board
.vbus_pin
)) {
1846 retval
= gpio_request(udc
->board
.vbus_pin
, "udc_vbus");
1848 DBG("request vbus pin failed\n");
1851 gpio_direction_input(udc
->board
.vbus_pin
);
1854 * Get the initial state of VBUS - we cannot expect
1855 * a pending interrupt.
1857 udc
->vbus
= gpio_get_value_cansleep(udc
->board
.vbus_pin
) ^
1858 udc
->board
.vbus_active_low
;
1860 if (udc
->board
.vbus_polled
) {
1861 INIT_WORK(&udc
->vbus_timer_work
, at91_vbus_timer_work
);
1862 setup_timer(&udc
->vbus_timer
, at91_vbus_timer
,
1863 (unsigned long)udc
);
1864 mod_timer(&udc
->vbus_timer
,
1865 jiffies
+ VBUS_POLL_TIMEOUT
);
1867 if (request_irq(udc
->board
.vbus_pin
, at91_vbus_irq
,
1868 0, driver_name
, udc
)) {
1869 DBG("request vbus irq %d failed\n",
1870 udc
->board
.vbus_pin
);
1876 DBG("no VBUS detection, assuming always-on\n");
1879 retval
= usb_add_gadget_udc(dev
, &udc
->gadget
);
1882 dev_set_drvdata(dev
, udc
);
1883 device_init_wakeup(dev
, 1);
1884 create_debug_file(udc
);
1886 INFO("%s version %s\n", driver_name
, DRIVER_VERSION
);
1889 if (gpio_is_valid(udc
->board
.vbus_pin
) && !udc
->board
.vbus_polled
)
1890 free_irq(udc
->board
.vbus_pin
, udc
);
1892 if (gpio_is_valid(udc
->board
.vbus_pin
))
1893 gpio_free(udc
->board
.vbus_pin
);
1895 free_irq(udc
->udp_irq
, udc
);
1897 device_unregister(&udc
->gadget
.dev
);
1899 iounmap(udc
->udp_baseaddr
);
1901 if (cpu_is_at91rm9200())
1902 gpio_free(udc
->board
.pullup_pin
);
1904 release_mem_region(res
->start
, resource_size(res
));
1905 DBG("%s probe failed, %d\n", driver_name
, retval
);
1909 static int __exit
at91udc_remove(struct platform_device
*pdev
)
1911 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1912 struct resource
*res
;
1913 unsigned long flags
;
1917 usb_del_gadget_udc(&udc
->gadget
);
1921 spin_lock_irqsave(&udc
->lock
, flags
);
1923 spin_unlock_irqrestore(&udc
->lock
, flags
);
1925 device_init_wakeup(&pdev
->dev
, 0);
1926 remove_debug_file(udc
);
1927 if (gpio_is_valid(udc
->board
.vbus_pin
)) {
1928 free_irq(udc
->board
.vbus_pin
, udc
);
1929 gpio_free(udc
->board
.vbus_pin
);
1931 free_irq(udc
->udp_irq
, udc
);
1932 device_unregister(&udc
->gadget
.dev
);
1934 iounmap(udc
->udp_baseaddr
);
1936 if (cpu_is_at91rm9200())
1937 gpio_free(udc
->board
.pullup_pin
);
1939 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1940 release_mem_region(res
->start
, resource_size(res
));
1949 static int at91udc_suspend(struct platform_device
*pdev
, pm_message_t mesg
)
1951 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1952 int wake
= udc
->driver
&& device_may_wakeup(&pdev
->dev
);
1953 unsigned long flags
;
1955 /* Unless we can act normally to the host (letting it wake us up
1956 * whenever it has work for us) force disconnect. Wakeup requires
1957 * PLLB for USB events (signaling for reset, wakeup, or incoming
1958 * tokens) and VBUS irqs (on systems which support them).
1960 if ((!udc
->suspended
&& udc
->addr
)
1962 || at91_suspend_entering_slow_clock()) {
1963 spin_lock_irqsave(&udc
->lock
, flags
);
1966 spin_unlock_irqrestore(&udc
->lock
, flags
);
1968 enable_irq_wake(udc
->udp_irq
);
1970 udc
->active_suspend
= wake
;
1971 if (gpio_is_valid(udc
->board
.vbus_pin
) && !udc
->board
.vbus_polled
&& wake
)
1972 enable_irq_wake(udc
->board
.vbus_pin
);
1976 static int at91udc_resume(struct platform_device
*pdev
)
1978 struct at91_udc
*udc
= platform_get_drvdata(pdev
);
1979 unsigned long flags
;
1981 if (gpio_is_valid(udc
->board
.vbus_pin
) && !udc
->board
.vbus_polled
&&
1982 udc
->active_suspend
)
1983 disable_irq_wake(udc
->board
.vbus_pin
);
1985 /* maybe reconnect to host; if so, clocks on */
1986 if (udc
->active_suspend
)
1987 disable_irq_wake(udc
->udp_irq
);
1989 spin_lock_irqsave(&udc
->lock
, flags
);
1991 spin_unlock_irqrestore(&udc
->lock
, flags
);
1996 #define at91udc_suspend NULL
1997 #define at91udc_resume NULL
2000 #if defined(CONFIG_OF)
2001 static const struct of_device_id at91_udc_dt_ids
[] = {
2002 { .compatible
= "atmel,at91rm9200-udc" },
2006 MODULE_DEVICE_TABLE(of
, at91_udc_dt_ids
);
2009 static struct platform_driver at91_udc_driver
= {
2010 .remove
= __exit_p(at91udc_remove
),
2011 .shutdown
= at91udc_shutdown
,
2012 .suspend
= at91udc_suspend
,
2013 .resume
= at91udc_resume
,
2015 .name
= (char *) driver_name
,
2016 .owner
= THIS_MODULE
,
2017 .of_match_table
= of_match_ptr(at91_udc_dt_ids
),
2021 static int __init
udc_init_module(void)
2023 return platform_driver_probe(&at91_udc_driver
, at91udc_probe
);
2025 module_init(udc_init_module
);
2027 static void __exit
udc_exit_module(void)
2029 platform_driver_unregister(&at91_udc_driver
);
2031 module_exit(udc_exit_module
);
2033 MODULE_DESCRIPTION("AT91 udc driver");
2034 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
2035 MODULE_LICENSE("GPL");
2036 MODULE_ALIAS("platform:at91_udc");