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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[net-next-2.6.git] / drivers / usb / gadget / lh7a40x_udc.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/drivers/usb/gadget/lh7a40x_udc.c
3 * Sharp LH7A40x on-chip full speed USB device controllers
4 *
5 * Copyright (C) 2004 Mikko Lahteenmaki, Nordic ID
6 * Copyright (C) 2004 Bo Henriksen, Nordic ID
7 *
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.
12 *
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.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
d052d1be
RK		 24#include <linux/platform_device.h>
25
1da177e4
LT		 26#include "lh7a40x_udc.h"
27
28//#define DEBUG printk
29//#define DEBUG_EP0 printk
30//#define DEBUG_SETUP printk
31
32#ifndef DEBUG_EP0
33# define DEBUG_EP0(fmt,args...)
34#endif
35#ifndef DEBUG_SETUP
36# define DEBUG_SETUP(fmt,args...)
37#endif
38#ifndef DEBUG
39# define NO_STATES
40# define DEBUG(fmt,args...)
41#endif
42
43#define DRIVER_DESC "LH7A40x USB Device Controller"
44#define DRIVER_VERSION __DATE__
45
46#ifndef _BIT /* FIXME - what happended to _BIT in 2.6.7bk18? */
47#define _BIT(x) (1<<(x))
48#endif
49
50struct lh7a40x_udc *the_controller;
51
52static const char driver_name[] = "lh7a40x_udc";
53static const char driver_desc[] = DRIVER_DESC;
54static const char ep0name[] = "ep0-control";
55
56/*
57 Local definintions.
58*/
59
60#ifndef NO_STATES
61static char *state_names[] = {
62 "WAIT_FOR_SETUP",
63 "DATA_STATE_XMIT",
64 "DATA_STATE_NEED_ZLP",
65 "WAIT_FOR_OUT_STATUS",
66 "DATA_STATE_RECV"
67};
68#endif
69
70/*
71 Local declarations.
72*/
73static int lh7a40x_ep_enable(struct usb_ep *ep,
74 const struct usb_endpoint_descriptor *);
75static int lh7a40x_ep_disable(struct usb_ep *ep);
55016f10 76static struct usb_request *lh7a40x_alloc_request(struct usb_ep *ep, gfp_t);
1da177e4
LT		 77static void lh7a40x_free_request(struct usb_ep *ep, struct usb_request *);
78static void *lh7a40x_alloc_buffer(struct usb_ep *ep, unsigned, dma_addr_t *,
55016f10 79 gfp_t);
1da177e4
LT		 80static void lh7a40x_free_buffer(struct usb_ep *ep, void *, dma_addr_t,
81 unsigned);
55016f10 82static int lh7a40x_queue(struct usb_ep *ep, struct usb_request *, gfp_t);
1da177e4
LT		 83static int lh7a40x_dequeue(struct usb_ep *ep, struct usb_request *);
84static int lh7a40x_set_halt(struct usb_ep *ep, int);
85static int lh7a40x_fifo_status(struct usb_ep *ep);
86static int lh7a40x_fifo_status(struct usb_ep *ep);
87static void lh7a40x_fifo_flush(struct usb_ep *ep);
88static void lh7a40x_ep0_kick(struct lh7a40x_udc *dev, struct lh7a40x_ep *ep);
89static void lh7a40x_handle_ep0(struct lh7a40x_udc *dev, u32 intr);
90
91static void done(struct lh7a40x_ep *ep, struct lh7a40x_request *req,
92 int status);
93static void pio_irq_enable(int bEndpointAddress);
94static void pio_irq_disable(int bEndpointAddress);
95static void stop_activity(struct lh7a40x_udc *dev,
96 struct usb_gadget_driver *driver);
97static void flush(struct lh7a40x_ep *ep);
98static void udc_enable(struct lh7a40x_udc *dev);
99static void udc_set_address(struct lh7a40x_udc *dev, unsigned char address);
100
101static struct usb_ep_ops lh7a40x_ep_ops = {
102 .enable = lh7a40x_ep_enable,
103 .disable = lh7a40x_ep_disable,
104
105 .alloc_request = lh7a40x_alloc_request,
106 .free_request = lh7a40x_free_request,
107
108 .alloc_buffer = lh7a40x_alloc_buffer,
109 .free_buffer = lh7a40x_free_buffer,
110
111 .queue = lh7a40x_queue,
112 .dequeue = lh7a40x_dequeue,
113
114 .set_halt = lh7a40x_set_halt,
115 .fifo_status = lh7a40x_fifo_status,
116 .fifo_flush = lh7a40x_fifo_flush,
117};
118
119/* Inline code */
120
121static __inline__ int write_packet(struct lh7a40x_ep *ep,
122 struct lh7a40x_request *req, int max)
123{
124 u8 *buf;
125 int length, count;
126 volatile u32 *fifo = (volatile u32 *)ep->fifo;
127
128 buf = req->req.buf + req->req.actual;
129 prefetch(buf);
130
131 length = req->req.length - req->req.actual;
132 length = min(length, max);
133 req->req.actual += length;
134
135 DEBUG("Write %d (max %d), fifo %p\n", length, max, fifo);
136
137 count = length;
138 while (count--) {
139 *fifo = *buf++;
140 }
141
142 return length;
143}
144
145static __inline__ void usb_set_index(u32 ep)
146{
147 *(volatile u32 *)io_p2v(USB_INDEX) = ep;
148}
149
150static __inline__ u32 usb_read(u32 port)
151{
152 return *(volatile u32 *)io_p2v(port);
153}
154
155static __inline__ void usb_write(u32 val, u32 port)
156{
157 *(volatile u32 *)io_p2v(port) = val;
158}
159
160static __inline__ void usb_set(u32 val, u32 port)
161{
162 volatile u32 *ioport = (volatile u32 *)io_p2v(port);
163 u32 after = (*ioport) | val;
164 *ioport = after;
165}
166
167static __inline__ void usb_clear(u32 val, u32 port)
168{
169 volatile u32 *ioport = (volatile u32 *)io_p2v(port);
170 u32 after = (*ioport) & ~val;
171 *ioport = after;
172}
173
174/*-------------------------------------------------------------------------*/
175
176#define GPIO_PORTC_DR (0x80000E08)
177#define GPIO_PORTC_DDR (0x80000E18)
178#define GPIO_PORTC_PDR (0x80000E70)
179
180/* get port C pin data register */
181#define get_portc_pdr(bit) ((usb_read(GPIO_PORTC_PDR) & _BIT(bit)) != 0)
182/* get port C data direction register */
183#define get_portc_ddr(bit) ((usb_read(GPIO_PORTC_DDR) & _BIT(bit)) != 0)
184/* set port C data register */
185#define set_portc_dr(bit, val) (val ? usb_set(_BIT(bit), GPIO_PORTC_DR) : usb_clear(_BIT(bit), GPIO_PORTC_DR))
186/* set port C data direction register */
187#define set_portc_ddr(bit, val) (val ? usb_set(_BIT(bit), GPIO_PORTC_DDR) : usb_clear(_BIT(bit), GPIO_PORTC_DDR))
188
189/*
190 * LPD7A404 GPIO's:
191 * Port C bit 1 = USB Port 1 Power Enable
192 * Port C bit 2 = USB Port 1 Data Carrier Detect
193 */
194#define is_usb_connected() get_portc_pdr(2)
195
196#ifdef CONFIG_USB_GADGET_DEBUG_FILES
197
198static const char proc_node_name[] = "driver/udc";
199
200static int
201udc_proc_read(char *page, char **start, off_t off, int count,
202 int *eof, void *_dev)
203{
204 char *buf = page;
205 struct lh7a40x_udc *dev = _dev;
206 char *next = buf;
207 unsigned size = count;
208 unsigned long flags;
209 int t;
210
211 if (off != 0)
212 return 0;
213
214 local_irq_save(flags);
215
216 /* basic device status */
217 t = scnprintf(next, size,
218 DRIVER_DESC "\n"
219 "%s version: %s\n"
220 "Gadget driver: %s\n"
221 "Host: %s\n\n",
222 driver_name, DRIVER_VERSION,
223 dev->driver ? dev->driver->driver.name : "(none)",
224 is_usb_connected()? "full speed" : "disconnected");
225 size -= t;
226 next += t;
227
228 t = scnprintf(next, size,
229 "GPIO:\n"
230 " Port C bit 1: %d, dir %d\n"
231 " Port C bit 2: %d, dir %d\n\n",
232 get_portc_pdr(1), get_portc_ddr(1),
233 get_portc_pdr(2), get_portc_ddr(2)
234 );
235 size -= t;
236 next += t;
237
238 t = scnprintf(next, size,
239 "DCP pullup: %d\n\n",
240 (usb_read(USB_PM) & PM_USB_DCP) != 0);
241 size -= t;
242 next += t;
243
244 local_irq_restore(flags);
245 *eof = 1;
246 return count - size;
247}
248
249#define create_proc_files() create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev)
250#define remove_proc_files() remove_proc_entry(proc_node_name, NULL)
251
252#else /* !CONFIG_USB_GADGET_DEBUG_FILES */
253
254#define create_proc_files() do {} while (0)
255#define remove_proc_files() do {} while (0)
256
257#endif /* CONFIG_USB_GADGET_DEBUG_FILES */
258
259/*
260 * udc_disable - disable USB device controller
261 */
262static void udc_disable(struct lh7a40x_udc *dev)
263{
264 DEBUG("%s, %p\n", __FUNCTION__, dev);
265
266 udc_set_address(dev, 0);
267
268 /* Disable interrupts */
269 usb_write(0, USB_IN_INT_EN);
270 usb_write(0, USB_OUT_INT_EN);
271 usb_write(0, USB_INT_EN);
272
273 /* Disable the USB */
274 usb_write(0, USB_PM);
275
276#ifdef CONFIG_ARCH_LH7A404
277 /* Disable USB power */
278 set_portc_dr(1, 0);
279#endif
280
281 /* if hardware supports it, disconnect from usb */
282 /* make_usb_disappear(); */
283
284 dev->ep0state = WAIT_FOR_SETUP;
285 dev->gadget.speed = USB_SPEED_UNKNOWN;
286 dev->usb_address = 0;
287}
288
289/*
290 * udc_reinit - initialize software state
291 */
292static void udc_reinit(struct lh7a40x_udc *dev)
293{
294 u32 i;
295
296 DEBUG("%s, %p\n", __FUNCTION__, dev);
297
298 /* device/ep0 records init */
299 INIT_LIST_HEAD(&dev->gadget.ep_list);
300 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
301 dev->ep0state = WAIT_FOR_SETUP;
302
303 /* basic endpoint records init */
304 for (i = 0; i < UDC_MAX_ENDPOINTS; i++) {
305 struct lh7a40x_ep *ep = &dev->ep[i];
306
307 if (i != 0)
308 list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
309
310 ep->desc = 0;
311 ep->stopped = 0;
312 INIT_LIST_HEAD(&ep->queue);
313 ep->pio_irqs = 0;
314 }
315
316 /* the rest was statically initialized, and is read-only */
317}
318
319#define BYTES2MAXP(x) (x / 8)
320#define MAXP2BYTES(x) (x * 8)
321
322/* until it's enabled, this UDC should be completely invisible
323 * to any USB host.
324 */
325static void udc_enable(struct lh7a40x_udc *dev)
326{
327 int ep;
328
329 DEBUG("%s, %p\n", __FUNCTION__, dev);
330
331 dev->gadget.speed = USB_SPEED_UNKNOWN;
332
333#ifdef CONFIG_ARCH_LH7A404
334 /* Set Port C bit 1 & 2 as output */
335 set_portc_ddr(1, 1);
336 set_portc_ddr(2, 1);
337
338 /* Enable USB power */
339 set_portc_dr(1, 0);
340#endif
341
342 /*
343 * C.f Chapter 18.1.3.1 Initializing the USB
344 */
345
346 /* Disable the USB */
347 usb_clear(PM_USB_ENABLE, USB_PM);
348
349 /* Reset APB & I/O sides of the USB */
350 usb_set(USB_RESET_APB | USB_RESET_IO, USB_RESET);
351 mdelay(5);
352 usb_clear(USB_RESET_APB | USB_RESET_IO, USB_RESET);
353
354 /* Set MAXP values for each */
355 for (ep = 0; ep < UDC_MAX_ENDPOINTS; ep++) {
356 struct lh7a40x_ep *ep_reg = &dev->ep[ep];
357 u32 csr;
358
359 usb_set_index(ep);
360
361 switch (ep_reg->ep_type) {
362 case ep_bulk_in:
363 case ep_interrupt:
364 usb_clear(USB_IN_CSR2_USB_DMA_EN | USB_IN_CSR2_AUTO_SET,
365 ep_reg->csr2);
366 /* Fall through */
367 case ep_control:
368 usb_write(BYTES2MAXP(ep_maxpacket(ep_reg)),
369 USB_IN_MAXP);
370 break;
371 case ep_bulk_out:
372 usb_clear(USB_OUT_CSR2_USB_DMA_EN |
373 USB_OUT_CSR2_AUTO_CLR, ep_reg->csr2);
374 usb_write(BYTES2MAXP(ep_maxpacket(ep_reg)),
375 USB_OUT_MAXP);
376 break;
377 }
378
379 /* Read & Write CSR1, just in case */
380 csr = usb_read(ep_reg->csr1);
381 usb_write(csr, ep_reg->csr1);
382
383 flush(ep_reg);
384 }
385
386 /* Disable interrupts */
387 usb_write(0, USB_IN_INT_EN);
388 usb_write(0, USB_OUT_INT_EN);
389 usb_write(0, USB_INT_EN);
390
391 /* Enable interrupts */
392 usb_set(USB_IN_INT_EP0, USB_IN_INT_EN);
393 usb_set(USB_INT_RESET_INT | USB_INT_RESUME_INT, USB_INT_EN);
394 /* Dont enable rest of the interrupts */
395 /* usb_set(USB_IN_INT_EP3 | USB_IN_INT_EP1 | USB_IN_INT_EP0, USB_IN_INT_EN);
396 usb_set(USB_OUT_INT_EP2, USB_OUT_INT_EN); */
397
398 /* Enable SUSPEND */
399 usb_set(PM_ENABLE_SUSPEND, USB_PM);
400
401 /* Enable the USB */
402 usb_set(PM_USB_ENABLE, USB_PM);
403
404#ifdef CONFIG_ARCH_LH7A404
405 /* NOTE: DOES NOT WORK! */
406 /* Let host detect UDC:
407 * Software must write a 0 to the PMR:DCP_CTRL bit to turn this
408 * transistor on and pull the USBDP pin HIGH.
409 */
410 /* usb_clear(PM_USB_DCP, USB_PM);
411 usb_set(PM_USB_DCP, USB_PM); */
412#endif
413}
414
415/*
416 Register entry point for the peripheral controller driver.
417*/
418int usb_gadget_register_driver(struct usb_gadget_driver *driver)
419{
420 struct lh7a40x_udc *dev = the_controller;
421 int retval;
422
423 DEBUG("%s: %s\n", __FUNCTION__, driver->driver.name);
424
425 if (!driver
426 || driver->speed != USB_SPEED_FULL
427 || !driver->bind
428 || !driver->unbind || !driver->disconnect || !driver->setup)
429 return -EINVAL;
430 if (!dev)
431 return -ENODEV;
432 if (dev->driver)
433 return -EBUSY;
434
435 /* first hook up the driver ... */
436 dev->driver = driver;
437 dev->gadget.dev.driver = &driver->driver;
438
439 device_add(&dev->gadget.dev);
440 retval = driver->bind(&dev->gadget);
441 if (retval) {
442 printk("%s: bind to driver %s --> error %d\n", dev->gadget.name,
443 driver->driver.name, retval);
444 device_del(&dev->gadget.dev);
445
446 dev->driver = 0;
447 dev->gadget.dev.driver = 0;
448 return retval;
449 }
450
451 /* ... then enable host detection and ep0; and we're ready
452 * for set_configuration as well as eventual disconnect.
453 * NOTE: this shouldn't power up until later.
454 */
455 printk("%s: registered gadget driver '%s'\n", dev->gadget.name,
456 driver->driver.name);
457
458 udc_enable(dev);
459
460 return 0;
461}
462
463EXPORT_SYMBOL(usb_gadget_register_driver);
464
465/*
466 Unregister entry point for the peripheral controller driver.
467*/
468int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
469{
470 struct lh7a40x_udc *dev = the_controller;
471 unsigned long flags;
472
473 if (!dev)
474 return -ENODEV;
475 if (!driver || driver != dev->driver)
476 return -EINVAL;
477
478 spin_lock_irqsave(&dev->lock, flags);
479 dev->driver = 0;
480 stop_activity(dev, driver);
481 spin_unlock_irqrestore(&dev->lock, flags);
482
483 driver->unbind(&dev->gadget);
484 device_del(&dev->gadget.dev);
485
486 udc_disable(dev);
487
488 DEBUG("unregistered gadget driver '%s'\n", driver->driver.name);
489 return 0;
490}
491
492EXPORT_SYMBOL(usb_gadget_unregister_driver);
493
494/*-------------------------------------------------------------------------*/
495
496/** Write request to FIFO (max write == maxp size)
497 * Return: 0 = still running, 1 = completed, negative = errno
498 * NOTE: INDEX register must be set for EP
499 */
500static int write_fifo(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
501{
502 u32 max;
503 u32 csr;
504
505 max = le16_to_cpu(ep->desc->wMaxPacketSize);
506
507 csr = usb_read(ep->csr1);
508 DEBUG("CSR: %x %d\n", csr, csr & USB_IN_CSR1_FIFO_NOT_EMPTY);
509
510 if (!(csr & USB_IN_CSR1_FIFO_NOT_EMPTY)) {
511 unsigned count;
512 int is_last, is_short;
513
514 count = write_packet(ep, req, max);
515 usb_set(USB_IN_CSR1_IN_PKT_RDY, ep->csr1);
516
517 /* last packet is usually short (or a zlp) */
518 if (unlikely(count != max))
519 is_last = is_short = 1;
520 else {
521 if (likely(req->req.length != req->req.actual)
522 || req->req.zero)
523 is_last = 0;
524 else
525 is_last = 1;
526 /* interrupt/iso maxpacket may not fill the fifo */
527 is_short = unlikely(max < ep_maxpacket(ep));
528 }
529
530 DEBUG("%s: wrote %s %d bytes%s%s %d left %p\n", __FUNCTION__,
531 ep->ep.name, count,
532 is_last ? "/L" : "", is_short ? "/S" : "",
533 req->req.length - req->req.actual, req);
534
535 /* requests complete when all IN data is in the FIFO */
536 if (is_last) {
537 done(ep, req, 0);
538 if (list_empty(&ep->queue)) {
539 pio_irq_disable(ep_index(ep));
540 }
541 return 1;
542 }
543 } else {
544 DEBUG("Hmm.. %d ep FIFO is not empty!\n", ep_index(ep));
545 }
546
547 return 0;
548}
549
550/** Read to request from FIFO (max read == bytes in fifo)
551 * Return: 0 = still running, 1 = completed, negative = errno
552 * NOTE: INDEX register must be set for EP
553 */
554static int read_fifo(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
555{
556 u32 csr;
557 u8 *buf;
558 unsigned bufferspace, count, is_short;
559 volatile u32 *fifo = (volatile u32 *)ep->fifo;
560
561 /* make sure there's a packet in the FIFO. */
562 csr = usb_read(ep->csr1);
563 if (!(csr & USB_OUT_CSR1_OUT_PKT_RDY)) {
564 DEBUG("%s: Packet NOT ready!\n", __FUNCTION__);
565 return -EINVAL;
566 }
567
568 buf = req->req.buf + req->req.actual;
569 prefetchw(buf);
570 bufferspace = req->req.length - req->req.actual;
571
572 /* read all bytes from this packet */
573 count = usb_read(USB_OUT_FIFO_WC1);
574 req->req.actual += min(count, bufferspace);
575
576 is_short = (count < ep->ep.maxpacket);
577 DEBUG("read %s %02x, %d bytes%s req %p %d/%d\n",
578 ep->ep.name, csr, count,
579 is_short ? "/S" : "", req, req->req.actual, req->req.length);
580
581 while (likely(count-- != 0)) {
582 u8 byte = (u8) (*fifo & 0xff);
583
584 if (unlikely(bufferspace == 0)) {
585 /* this happens when the driver's buffer
586 * is smaller than what the host sent.
587 * discard the extra data.
588 */
589 if (req->req.status != -EOVERFLOW)
590 printk("%s overflow %d\n", ep->ep.name, count);
591 req->req.status = -EOVERFLOW;
592 } else {
593 *buf++ = byte;
594 bufferspace--;
595 }
596 }
597
598 usb_clear(USB_OUT_CSR1_OUT_PKT_RDY, ep->csr1);
599
600 /* completion */
601 if (is_short || req->req.actual == req->req.length) {
602 done(ep, req, 0);
603 usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1);
604
605 if (list_empty(&ep->queue))
606 pio_irq_disable(ep_index(ep));
607 return 1;
608 }
609
610 /* finished that packet. the next one may be waiting... */
611 return 0;
612}
613
614/*
615 * done - retire a request; caller blocked irqs
616 * INDEX register is preserved to keep same
617 */
618static void done(struct lh7a40x_ep *ep, struct lh7a40x_request *req, int status)
619{
620 unsigned int stopped = ep->stopped;
621 u32 index;
622
623 DEBUG("%s, %p\n", __FUNCTION__, ep);
624 list_del_init(&req->queue);
625
626 if (likely(req->req.status == -EINPROGRESS))
627 req->req.status = status;
628 else
629 status = req->req.status;
630
631 if (status && status != -ESHUTDOWN)
632 DEBUG("complete %s req %p stat %d len %u/%u\n",
633 ep->ep.name, &req->req, status,
634 req->req.actual, req->req.length);
635
636 /* don't modify queue heads during completion callback */
637 ep->stopped = 1;
638 /* Read current index (completion may modify it) */
639 index = usb_read(USB_INDEX);
640
641 spin_unlock(&ep->dev->lock);
642 req->req.complete(&ep->ep, &req->req);
643 spin_lock(&ep->dev->lock);
644
645 /* Restore index */
646 usb_set_index(index);
647 ep->stopped = stopped;
648}
649
650/** Enable EP interrupt */
651static void pio_irq_enable(int ep)
652{
653 DEBUG("%s: %d\n", __FUNCTION__, ep);
654
655 switch (ep) {
656 case 1:
657 usb_set(USB_IN_INT_EP1, USB_IN_INT_EN);
658 break;
659 case 2:
660 usb_set(USB_OUT_INT_EP2, USB_OUT_INT_EN);
661 break;
662 case 3:
663 usb_set(USB_IN_INT_EP3, USB_IN_INT_EN);
664 break;
665 default:
666 DEBUG("Unknown endpoint: %d\n", ep);
667 break;
668 }
669}
670
671/** Disable EP interrupt */
672static void pio_irq_disable(int ep)
673{
674 DEBUG("%s: %d\n", __FUNCTION__, ep);
675
676 switch (ep) {
677 case 1:
678 usb_clear(USB_IN_INT_EP1, USB_IN_INT_EN);
679 break;
680 case 2:
681 usb_clear(USB_OUT_INT_EP2, USB_OUT_INT_EN);
682 break;
683 case 3:
684 usb_clear(USB_IN_INT_EP3, USB_IN_INT_EN);
685 break;
686 default:
687 DEBUG("Unknown endpoint: %d\n", ep);
688 break;
689 }
690}
691
692/*
693 * nuke - dequeue ALL requests
694 */
695void nuke(struct lh7a40x_ep *ep, int status)
696{
697 struct lh7a40x_request *req;
698
699 DEBUG("%s, %p\n", __FUNCTION__, ep);
700
701 /* Flush FIFO */
702 flush(ep);
703
704 /* called with irqs blocked */
705 while (!list_empty(&ep->queue)) {
706 req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
707 done(ep, req, status);
708 }
709
093cf723 710 /* Disable IRQ if EP is enabled (has descriptor) */
1da177e4
LT		 711 if (ep->desc)
712 pio_irq_disable(ep_index(ep));
713}
714
715/*
716void nuke_all(struct lh7a40x_udc *dev)
717{
718 int n;
719 for(n=0; n<UDC_MAX_ENDPOINTS; n++) {
720 struct lh7a40x_ep *ep = &dev->ep[n];
721 usb_set_index(n);
722 nuke(ep, 0);
723 }
724}*/
725
726/*
727static void flush_all(struct lh7a40x_udc *dev)
728{
729 int n;
730 for (n = 0; n < UDC_MAX_ENDPOINTS; n++)
731 {
732 struct lh7a40x_ep *ep = &dev->ep[n];
733 flush(ep);
734 }
735}
736*/
737
738/** Flush EP
739 * NOTE: INDEX register must be set before this call
740 */
741static void flush(struct lh7a40x_ep *ep)
742{
743 DEBUG("%s, %p\n", __FUNCTION__, ep);
744
745 switch (ep->ep_type) {
746 case ep_control:
747 /* check, by implication c.f. 15.1.2.11 */
748 break;
749
750 case ep_bulk_in:
751 case ep_interrupt:
752 /* if(csr & USB_IN_CSR1_IN_PKT_RDY) */
753 usb_set(USB_IN_CSR1_FIFO_FLUSH, ep->csr1);
754 break;
755
756 case ep_bulk_out:
757 /* if(csr & USB_OUT_CSR1_OUT_PKT_RDY) */
758 usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1);
759 break;
760 }
761}
762
763/**
764 * lh7a40x_in_epn - handle IN interrupt
765 */
766static void lh7a40x_in_epn(struct lh7a40x_udc *dev, u32 ep_idx, u32 intr)
767{
768 u32 csr;
769 struct lh7a40x_ep *ep = &dev->ep[ep_idx];
770 struct lh7a40x_request *req;
771
772 usb_set_index(ep_idx);
773
774 csr = usb_read(ep->csr1);
775 DEBUG("%s: %d, csr %x\n", __FUNCTION__, ep_idx, csr);
776
777 if (csr & USB_IN_CSR1_SENT_STALL) {
778 DEBUG("USB_IN_CSR1_SENT_STALL\n");
779 usb_set(USB_IN_CSR1_SENT_STALL /*|USB_IN_CSR1_SEND_STALL */ ,
780 ep->csr1);
781 return;
782 }
783
784 if (!ep->desc) {
785 DEBUG("%s: NO EP DESC\n", __FUNCTION__);
786 return;
787 }
788
789 if (list_empty(&ep->queue))
790 req = 0;
791 else
792 req = list_entry(ep->queue.next, struct lh7a40x_request, queue);
793
794 DEBUG("req: %p\n", req);
795
796 if (!req)
797 return;
798
799 write_fifo(ep, req);
800}
801
802/* ********************************************************************************************* */
803/* Bulk OUT (recv)
804 */
805
806static void lh7a40x_out_epn(struct lh7a40x_udc *dev, u32 ep_idx, u32 intr)
807{
808 struct lh7a40x_ep *ep = &dev->ep[ep_idx];
809 struct lh7a40x_request *req;
810
811 DEBUG("%s: %d\n", __FUNCTION__, ep_idx);
812
813 usb_set_index(ep_idx);
814
815 if (ep->desc) {
816 u32 csr;
817 csr = usb_read(ep->csr1);
818
819 while ((csr =
820 usb_read(ep->
821 csr1)) & (USB_OUT_CSR1_OUT_PKT_RDY |
822 USB_OUT_CSR1_SENT_STALL)) {
823 DEBUG("%s: %x\n", __FUNCTION__, csr);
824
825 if (csr & USB_OUT_CSR1_SENT_STALL) {
826 DEBUG("%s: stall sent, flush fifo\n",
827 __FUNCTION__);
828 /* usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1); */
829 flush(ep);
830 } else if (csr & USB_OUT_CSR1_OUT_PKT_RDY) {
831 if (list_empty(&ep->queue))
832 req = 0;
833 else
834 req =
835 list_entry(ep->queue.next,
836 struct lh7a40x_request,
837 queue);
838
839 if (!req) {
840 printk("%s: NULL REQ %d\n",
841 __FUNCTION__, ep_idx);
842 flush(ep);
843 break;
844 } else {
845 read_fifo(ep, req);
846 }
847 }
848
849 }
850
851 } else {
852 /* Throw packet away.. */
853 printk("%s: No descriptor?!?\n", __FUNCTION__);
854 flush(ep);
855 }
856}
857
858static void stop_activity(struct lh7a40x_udc *dev,
859 struct usb_gadget_driver *driver)
860{
861 int i;
862
863 /* don't disconnect drivers more than once */
864 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
865 driver = 0;
866 dev->gadget.speed = USB_SPEED_UNKNOWN;
867
868 /* prevent new request submissions, kill any outstanding requests */
869 for (i = 0; i < UDC_MAX_ENDPOINTS; i++) {
870 struct lh7a40x_ep *ep = &dev->ep[i];
871 ep->stopped = 1;
872
873 usb_set_index(i);
874 nuke(ep, -ESHUTDOWN);
875 }
876
877 /* report disconnect; the driver is already quiesced */
878 if (driver) {
879 spin_unlock(&dev->lock);
880 driver->disconnect(&dev->gadget);
881 spin_lock(&dev->lock);
882 }
883
884 /* re-init driver-visible data structures */
885 udc_reinit(dev);
886}
887
888/** Handle USB RESET interrupt
889 */
890static void lh7a40x_reset_intr(struct lh7a40x_udc *dev)
891{
892#if 0 /* def CONFIG_ARCH_LH7A404 */
893 /* Does not work always... */
894
895 DEBUG("%s: %d\n", __FUNCTION__, dev->usb_address);
896
897 if (!dev->usb_address) {
898 /*usb_set(USB_RESET_IO, USB_RESET);
899 mdelay(5);
900 usb_clear(USB_RESET_IO, USB_RESET); */
901 return;
902 }
903 /* Put the USB controller into reset. */
904 usb_set(USB_RESET_IO, USB_RESET);
905
906 /* Set Device ID to 0 */
907 udc_set_address(dev, 0);
908
909 /* Let PLL2 settle down */
910 mdelay(5);
911
912 /* Release the USB controller from reset */
913 usb_clear(USB_RESET_IO, USB_RESET);
914
915 /* Re-enable UDC */
916 udc_enable(dev);
917
918#endif
919 dev->gadget.speed = USB_SPEED_FULL;
920}
921
922/*
923 * lh7a40x usb client interrupt handler.
924 */
7d12e780 925static irqreturn_t lh7a40x_udc_irq(int irq, void *_dev)
1da177e4
LT		 926{
927 struct lh7a40x_udc *dev = _dev;
928
929 DEBUG("\n\n");
930
931 spin_lock(&dev->lock);
932
933 for (;;) {
934 u32 intr_in = usb_read(USB_IN_INT);
935 u32 intr_out = usb_read(USB_OUT_INT);
936 u32 intr_int = usb_read(USB_INT);
937
938 /* Test also against enable bits.. (lh7a40x errata).. Sigh.. */
939 u32 in_en = usb_read(USB_IN_INT_EN);
940 u32 out_en = usb_read(USB_OUT_INT_EN);
941
942 if (!intr_out && !intr_in && !intr_int)
943 break;
944
945 DEBUG("%s (on state %s)\n", __FUNCTION__,
946 state_names[dev->ep0state]);
947 DEBUG("intr_out = %x\n", intr_out);
948 DEBUG("intr_in = %x\n", intr_in);
949 DEBUG("intr_int = %x\n", intr_int);
950
951 if (intr_in) {
952 usb_write(intr_in, USB_IN_INT);
953
954 if ((intr_in & USB_IN_INT_EP1)
955 && (in_en & USB_IN_INT_EP1)) {
956 DEBUG("USB_IN_INT_EP1\n");
957 lh7a40x_in_epn(dev, 1, intr_in);
958 }
959 if ((intr_in & USB_IN_INT_EP3)
960 && (in_en & USB_IN_INT_EP3)) {
961 DEBUG("USB_IN_INT_EP3\n");
962 lh7a40x_in_epn(dev, 3, intr_in);
963 }
964 if (intr_in & USB_IN_INT_EP0) {
965 DEBUG("USB_IN_INT_EP0 (control)\n");
966 lh7a40x_handle_ep0(dev, intr_in);
967 }
968 }
969
970 if (intr_out) {
971 usb_write(intr_out, USB_OUT_INT);
972
973 if ((intr_out & USB_OUT_INT_EP2)
974 && (out_en & USB_OUT_INT_EP2)) {
975 DEBUG("USB_OUT_INT_EP2\n");
976 lh7a40x_out_epn(dev, 2, intr_out);
977 }
978 }
979
980 if (intr_int) {
981 usb_write(intr_int, USB_INT);
982
983 if (intr_int & USB_INT_RESET_INT) {
984 lh7a40x_reset_intr(dev);
985 }
986
987 if (intr_int & USB_INT_RESUME_INT) {
988 DEBUG("USB resume\n");
989
990 if (dev->gadget.speed != USB_SPEED_UNKNOWN
991 && dev->driver
992 && dev->driver->resume
993 && is_usb_connected()) {
994 dev->driver->resume(&dev->gadget);
995 }
996 }
997
998 if (intr_int & USB_INT_SUSPEND_INT) {
999 DEBUG("USB suspend%s\n",
1000 is_usb_connected()? "" : "+disconnect");
1001 if (!is_usb_connected()) {
1002 stop_activity(dev, dev->driver);
1003 } else if (dev->gadget.speed !=
1004 USB_SPEED_UNKNOWN && dev->driver
1005 && dev->driver->suspend) {
1006 dev->driver->suspend(&dev->gadget);
1007 }
1008 }
1009
1010 }
1011 }
1012
1013 spin_unlock(&dev->lock);
1014
1015 return IRQ_HANDLED;
1016}
1017
1018static int lh7a40x_ep_enable(struct usb_ep *_ep,
1019 const struct usb_endpoint_descriptor *desc)
1020{
1021 struct lh7a40x_ep *ep;
1022 struct lh7a40x_udc *dev;
1023 unsigned long flags;
1024
1025 DEBUG("%s, %p\n", __FUNCTION__, _ep);
1026
1027 ep = container_of(_ep, struct lh7a40x_ep, ep);
1028 if (!_ep || !desc || ep->desc || _ep->name == ep0name
1029 || desc->bDescriptorType != USB_DT_ENDPOINT
1030 || ep->bEndpointAddress != desc->bEndpointAddress
1031 || ep_maxpacket(ep) < le16_to_cpu(desc->wMaxPacketSize)) {
1032 DEBUG("%s, bad ep or descriptor\n", __FUNCTION__);
1033 return -EINVAL;
1034 }
1035
1036 /* xfer types must match, except that interrupt ~= bulk */
1037 if (ep->bmAttributes != desc->bmAttributes
1038 && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
1039 && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
1040 DEBUG("%s, %s type mismatch\n", __FUNCTION__, _ep->name);
1041 return -EINVAL;
1042 }
1043
1044 /* hardware _could_ do smaller, but driver doesn't */
1045 if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
1046 && le16_to_cpu(desc->wMaxPacketSize) != ep_maxpacket(ep))
1047 || !desc->wMaxPacketSize) {
1048 DEBUG("%s, bad %s maxpacket\n", __FUNCTION__, _ep->name);
1049 return -ERANGE;
1050 }
1051
1052 dev = ep->dev;
1053 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1054 DEBUG("%s, bogus device state\n", __FUNCTION__);
1055 return -ESHUTDOWN;
1056 }
1057
1058 spin_lock_irqsave(&ep->dev->lock, flags);
1059
1060 ep->stopped = 0;
1061 ep->desc = desc;
1062 ep->pio_irqs = 0;
1063 ep->ep.maxpacket = le16_to_cpu(desc->wMaxPacketSize);
1064
d5ec3349
FBH		 1065 spin_unlock_irqrestore(&ep->dev->lock, flags);
1066
1da177e4
LT		 1067 /* Reset halt state (does flush) */
1068 lh7a40x_set_halt(_ep, 0);
1069
1da177e4
LT		 1070 DEBUG("%s: enabled %s\n", __FUNCTION__, _ep->name);
1071 return 0;
1072}
1073
1074/** Disable EP
1075 * NOTE: Sets INDEX register
1076 */
1077static int lh7a40x_ep_disable(struct usb_ep *_ep)
1078{
1079 struct lh7a40x_ep *ep;
1080 unsigned long flags;
1081
1082 DEBUG("%s, %p\n", __FUNCTION__, _ep);
1083
1084 ep = container_of(_ep, struct lh7a40x_ep, ep);
1085 if (!_ep || !ep->desc) {
1086 DEBUG("%s, %s not enabled\n", __FUNCTION__,
1087 _ep ? ep->ep.name : NULL);
1088 return -EINVAL;
1089 }
1090
1091 spin_lock_irqsave(&ep->dev->lock, flags);
1092
1093 usb_set_index(ep_index(ep));
1094
1095 /* Nuke all pending requests (does flush) */
1096 nuke(ep, -ESHUTDOWN);
1097
1098 /* Disable ep IRQ */
1099 pio_irq_disable(ep_index(ep));
1100
1101 ep->desc = 0;
1102 ep->stopped = 1;
1103
1104 spin_unlock_irqrestore(&ep->dev->lock, flags);
1105
1106 DEBUG("%s: disabled %s\n", __FUNCTION__, _ep->name);
1107 return 0;
1108}
1109
1110static struct usb_request *lh7a40x_alloc_request(struct usb_ep *ep,
55016f10 1111 gfp_t gfp_flags)
1da177e4
LT		 1112{
1113 struct lh7a40x_request *req;
1114
1115 DEBUG("%s, %p\n", __FUNCTION__, ep);
1116
7039f422 1117 req = kzalloc(sizeof(*req), gfp_flags);
1da177e4
LT		 1118 if (!req)
1119 return 0;
1120
1da177e4
LT		 1121 INIT_LIST_HEAD(&req->queue);
1122
1123 return &req->req;
1124}
1125
1126static void lh7a40x_free_request(struct usb_ep *ep, struct usb_request *_req)
1127{
1128 struct lh7a40x_request *req;
1129
1130 DEBUG("%s, %p\n", __FUNCTION__, ep);
1131
1132 req = container_of(_req, struct lh7a40x_request, req);
1133 WARN_ON(!list_empty(&req->queue));
1134 kfree(req);
1135}
1136
1137static void *lh7a40x_alloc_buffer(struct usb_ep *ep, unsigned bytes,
55016f10 1138 dma_addr_t * dma, gfp_t gfp_flags)
1da177e4
LT		 1139{
1140 char *retval;
1141
1142 DEBUG("%s (%p, %d, %d)\n", __FUNCTION__, ep, bytes, gfp_flags);
1143
1144 retval = kmalloc(bytes, gfp_flags & ~(__GFP_DMA | __GFP_HIGHMEM));
1145 if (retval)
1146 *dma = virt_to_bus(retval);
1147 return retval;
1148}
1149
1150static void lh7a40x_free_buffer(struct usb_ep *ep, void *buf, dma_addr_t dma,
1151 unsigned bytes)
1152{
1153 DEBUG("%s, %p\n", __FUNCTION__, ep);
1154 kfree(buf);
1155}
1156
1157/** Queue one request
1158 * Kickstart transfer if needed
1159 * NOTE: Sets INDEX register
1160 */
1161static int lh7a40x_queue(struct usb_ep *_ep, struct usb_request *_req,
55016f10 1162 gfp_t gfp_flags)
1da177e4
LT		 1163{
1164 struct lh7a40x_request *req;
1165 struct lh7a40x_ep *ep;
1166 struct lh7a40x_udc *dev;
1167 unsigned long flags;
1168
1169 DEBUG("\n\n\n%s, %p\n", __FUNCTION__, _ep);
1170
1171 req = container_of(_req, struct lh7a40x_request, req);
1172 if (unlikely
1173 (!_req || !_req->complete || !_req->buf
1174 || !list_empty(&req->queue))) {
1175 DEBUG("%s, bad params\n", __FUNCTION__);
1176 return -EINVAL;
1177 }
1178
1179 ep = container_of(_ep, struct lh7a40x_ep, ep);
1180 if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
1181 DEBUG("%s, bad ep\n", __FUNCTION__);
1182 return -EINVAL;
1183 }
1184
1185 dev = ep->dev;
1186 if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
1187 DEBUG("%s, bogus device state %p\n", __FUNCTION__, dev->driver);
1188 return -ESHUTDOWN;
1189 }
1190
1191 DEBUG("%s queue req %p, len %d buf %p\n", _ep->name, _req, _req->length,
1192 _req->buf);
1193
1194 spin_lock_irqsave(&dev->lock, flags);
1195
1196 _req->status = -EINPROGRESS;
1197 _req->actual = 0;
1198
1199 /* kickstart this i/o queue? */
1200 DEBUG("Add to %d Q %d %d\n", ep_index(ep), list_empty(&ep->queue),
1201 ep->stopped);
1202 if (list_empty(&ep->queue) && likely(!ep->stopped)) {
1203 u32 csr;
1204
1205 if (unlikely(ep_index(ep) == 0)) {
1206 /* EP0 */
1207 list_add_tail(&req->queue, &ep->queue);
1208 lh7a40x_ep0_kick(dev, ep);
1209 req = 0;
1210 } else if (ep_is_in(ep)) {
1211 /* EP1 & EP3 */
1212 usb_set_index(ep_index(ep));
1213 csr = usb_read(ep->csr1);
1214 pio_irq_enable(ep_index(ep));
1215 if ((csr & USB_IN_CSR1_FIFO_NOT_EMPTY) == 0) {
1216 if (write_fifo(ep, req) == 1)
1217 req = 0;
1218 }
1219 } else {
1220 /* EP2 */
1221 usb_set_index(ep_index(ep));
1222 csr = usb_read(ep->csr1);
1223 pio_irq_enable(ep_index(ep));
1224 if (!(csr & USB_OUT_CSR1_FIFO_FULL)) {
1225 if (read_fifo(ep, req) == 1)
1226 req = 0;
1227 }
1228 }
1229 }
1230
1231 /* pio or dma irq handler advances the queue. */
1232 if (likely(req != 0))
1233 list_add_tail(&req->queue, &ep->queue);
1234
1235 spin_unlock_irqrestore(&dev->lock, flags);
1236
1237 return 0;
1238}
1239
1240/* dequeue JUST ONE request */
1241static int lh7a40x_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1242{
1243 struct lh7a40x_ep *ep;
1244 struct lh7a40x_request *req;
1245 unsigned long flags;
1246
1247 DEBUG("%s, %p\n", __FUNCTION__, _ep);
1248
1249 ep = container_of(_ep, struct lh7a40x_ep, ep);
1250 if (!_ep || ep->ep.name == ep0name)
1251 return -EINVAL;
1252
1253 spin_lock_irqsave(&ep->dev->lock, flags);
1254
1255 /* make sure it's actually queued on this endpoint */
1256 list_for_each_entry(req, &ep->queue, queue) {
1257 if (&req->req == _req)
1258 break;
1259 }
1260 if (&req->req != _req) {
1261 spin_unlock_irqrestore(&ep->dev->lock, flags);
1262 return -EINVAL;
1263 }
1264
1265 done(ep, req, -ECONNRESET);
1266
1267 spin_unlock_irqrestore(&ep->dev->lock, flags);
1268 return 0;
1269}
1270
1271/** Halt specific EP
1272 * Return 0 if success
1273 * NOTE: Sets INDEX register to EP !
1274 */
1275static int lh7a40x_set_halt(struct usb_ep *_ep, int value)
1276{
1277 struct lh7a40x_ep *ep;
1278 unsigned long flags;
1279
1280 ep = container_of(_ep, struct lh7a40x_ep, ep);
1281 if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
1282 DEBUG("%s, bad ep\n", __FUNCTION__);
1283 return -EINVAL;
1284 }
1285
1286 usb_set_index(ep_index(ep));
1287
1288 DEBUG("%s, ep %d, val %d\n", __FUNCTION__, ep_index(ep), value);
1289
1290 spin_lock_irqsave(&ep->dev->lock, flags);
1291
1292 if (ep_index(ep) == 0) {
1293 /* EP0 */
1294 usb_set(EP0_SEND_STALL, ep->csr1);
1295 } else if (ep_is_in(ep)) {
1296 u32 csr = usb_read(ep->csr1);
1297 if (value && ((csr & USB_IN_CSR1_FIFO_NOT_EMPTY)
1298 || !list_empty(&ep->queue))) {
1299 /*
1300 * Attempts to halt IN endpoints will fail (returning -EAGAIN)
1301 * if any transfer requests are still queued, or if the controller
1302