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Merge remote-tracking branch 'upstream/master' into kvm-devel
[linux-2.6/kvm.git] / drivers / usb / host / sl811-hcd.c
blob961d6638d8f9404e16eea2158eba7ae49d171776
1 /*
2 * SL811HS HCD (Host Controller Driver) for USB.
3 *
4 * Copyright (C) 2004 Psion Teklogix (for NetBook PRO)
5 * Copyright (C) 2004-2005 David Brownell
6 *
7 * Periodic scheduling is based on Roman's OHCI code
8 * Copyright (C) 1999 Roman Weissgaerber
9 *
10 * The SL811HS controller handles host side USB (like the SL11H, but with
11 * another register set and SOF generation) as well as peripheral side USB
12 * (like the SL811S). This driver version doesn't implement the Gadget API
13 * for the peripheral role; or OTG (that'd need much external circuitry).
14 *
15 * For documentation, see the SL811HS spec and the "SL811HS Embedded Host"
16 * document (providing significant pieces missing from that spec); plus
17 * the SL811S spec if you want peripheral side info.
18 */
19
20 /*
21 * Status: Passed basic stress testing, works with hubs, mice, keyboards,
22 * and usb-storage.
23 *
24 * TODO:
25 * - usb suspend/resume triggered by sl811 (with USB_SUSPEND)
26 * - various issues noted in the code
27 * - performance work; use both register banks; ...
28 * - use urb->iso_frame_desc[] with ISO transfers
29 */
30
31 #undef VERBOSE
32 #undef PACKET_TRACE
33
34 #include <linux/module.h>
35 #include <linux/moduleparam.h>
36 #include <linux/kernel.h>
37 #include <linux/delay.h>
38 #include <linux/ioport.h>
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/errno.h>
42 #include <linux/init.h>
43 #include <linux/timer.h>
44 #include <linux/list.h>
45 #include <linux/interrupt.h>
46 #include <linux/usb.h>
47 #include <linux/usb/sl811.h>
48 #include <linux/usb/hcd.h>
49 #include <linux/platform_device.h>
50 #include <linux/prefetch.h>
51
52 #include <asm/io.h>
53 #include <asm/irq.h>
54 #include <asm/system.h>
55 #include <asm/byteorder.h>
56 #include <asm/unaligned.h>
57
58 #include "sl811.h"
59
60
61 MODULE_DESCRIPTION("SL811HS USB Host Controller Driver");
62 MODULE_LICENSE("GPL");
63 MODULE_ALIAS("platform:sl811-hcd");
64
65 #define DRIVER_VERSION "19 May 2005"
66
67
68 #ifndef DEBUG
69 # define STUB_DEBUG_FILE
70 #endif
71
72 /* for now, use only one transfer register bank */
73 #undef USE_B
74
75 // #define QUIRK2
76 #define QUIRK3
77
78 static const char hcd_name[] = "sl811-hcd";
79
80 /*-------------------------------------------------------------------------*/
81
82 static void port_power(struct sl811 *sl811, int is_on)
83 {
84 struct usb_hcd *hcd = sl811_to_hcd(sl811);
85
86 /* hub is inactive unless the port is powered */
87 if (is_on) {
88 if (sl811->port1 & USB_PORT_STAT_POWER)
89 return;
90
91 sl811->port1 = USB_PORT_STAT_POWER;
92 sl811->irq_enable = SL11H_INTMASK_INSRMV;
93 } else {
94 sl811->port1 = 0;
95 sl811->irq_enable = 0;
96 hcd->state = HC_STATE_HALT;
97 }
98 sl811->ctrl1 = 0;
99 sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
100 sl811_write(sl811, SL11H_IRQ_STATUS, ~0);
101
102 if (sl811->board && sl811->board->port_power) {
103 /* switch VBUS, at 500mA unless hub power budget gets set */
104 DBG("power %s\n", is_on ? "on" : "off");
105 sl811->board->port_power(hcd->self.controller, is_on);
106 }
107
108 /* reset as thoroughly as we can */
109 if (sl811->board && sl811->board->reset)
110 sl811->board->reset(hcd->self.controller);
111 else {
112 sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0);
113 mdelay(20);
114 }
115
116 sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
117 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
118 sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT);
119 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
120
121 // if !is_on, put into lowpower mode now
122 }
123
124 /*-------------------------------------------------------------------------*/
125
126 /* This is a PIO-only HCD. Queueing appends URBs to the endpoint's queue,
127 * and may start I/O. Endpoint queues are scanned during completion irq
128 * handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation.
129 *
130 * Using an external DMA engine to copy a packet at a time could work,
131 * though setup/teardown costs may be too big to make it worthwhile.
132 */
133
134 /* SETUP starts a new control request. Devices are not allowed to
135 * STALL or NAK these; they must cancel any pending control requests.
136 */
137 static void setup_packet(
138 struct sl811 *sl811,
139 struct sl811h_ep *ep,
140 struct urb *urb,
141 u8 bank,
142 u8 control
143 )
144 {
145 u8 addr;
146 u8 len;
147 void __iomem *data_reg;
148
149 addr = SL811HS_PACKET_BUF(bank == 0);
150 len = sizeof(struct usb_ctrlrequest);
151 data_reg = sl811->data_reg;
152 sl811_write_buf(sl811, addr, urb->setup_packet, len);
153
154 /* autoincrementing */
155 sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
156 writeb(len, data_reg);
157 writeb(SL_SETUP /* | ep->epnum */, data_reg);
158 writeb(usb_pipedevice(urb->pipe), data_reg);
159
160 /* always OUT/data0 */ ;
161 sl811_write(sl811, bank + SL11H_HOSTCTLREG,
162 control | SL11H_HCTLMASK_OUT);
163 ep->length = 0;
164 PACKET("SETUP qh%p\n", ep);
165 }
166
167 /* STATUS finishes control requests, often after IN or OUT data packets */
168 static void status_packet(
169 struct sl811 *sl811,
170 struct sl811h_ep *ep,
171 struct urb *urb,
172 u8 bank,
173 u8 control
174 )
175 {
176 int do_out;
177 void __iomem *data_reg;
178
179 do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe);
180 data_reg = sl811->data_reg;
181
182 /* autoincrementing */
183 sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
184 writeb(0, data_reg);
185 writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg);
186 writeb(usb_pipedevice(urb->pipe), data_reg);
187
188 /* always data1; sometimes IN */
189 control |= SL11H_HCTLMASK_TOGGLE;
190 if (do_out)
191 control |= SL11H_HCTLMASK_OUT;
192 sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
193 ep->length = 0;
194 PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "",
195 do_out ? "out" : "in", ep);
196 }
197
198 /* IN packets can be used with any type of endpoint. here we just
199 * start the transfer, data from the peripheral may arrive later.
200 * urb->iso_frame_desc is currently ignored here...
201 */
202 static void in_packet(
203 struct sl811 *sl811,
204 struct sl811h_ep *ep,
205 struct urb *urb,
206 u8 bank,
207 u8 control
208 )
209 {
210 u8 addr;
211 u8 len;
212 void __iomem *data_reg;
213
214 /* avoid losing data on overflow */
215 len = ep->maxpacket;
216 addr = SL811HS_PACKET_BUF(bank == 0);
217 if (!(control & SL11H_HCTLMASK_ISOCH)
218 && usb_gettoggle(urb->dev, ep->epnum, 0))
219 control |= SL11H_HCTLMASK_TOGGLE;
220 data_reg = sl811->data_reg;
221
222 /* autoincrementing */
223 sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
224 writeb(len, data_reg);
225 writeb(SL_IN | ep->epnum, data_reg);
226 writeb(usb_pipedevice(urb->pipe), data_reg);
227
228 sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
229 ep->length = min_t(u32, len,
230 urb->transfer_buffer_length - urb->actual_length);
231 PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
232 !!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
233 }
234
235 /* OUT packets can be used with any type of endpoint.
236 * urb->iso_frame_desc is currently ignored here...
237 */
238 static void out_packet(
239 struct sl811 *sl811,
240 struct sl811h_ep *ep,
241 struct urb *urb,
242 u8 bank,
243 u8 control
244 )
245 {
246 void *buf;
247 u8 addr;
248 u8 len;
249 void __iomem *data_reg;
250
251 buf = urb->transfer_buffer + urb->actual_length;
252 prefetch(buf);
253
254 len = min_t(u32, ep->maxpacket,
255 urb->transfer_buffer_length - urb->actual_length);
256
257 if (!(control & SL11H_HCTLMASK_ISOCH)
258 && usb_gettoggle(urb->dev, ep->epnum, 1))
259 control |= SL11H_HCTLMASK_TOGGLE;
260 addr = SL811HS_PACKET_BUF(bank == 0);
261 data_reg = sl811->data_reg;
262
263 sl811_write_buf(sl811, addr, buf, len);
264
265 /* autoincrementing */
266 sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
267 writeb(len, data_reg);
268 writeb(SL_OUT | ep->epnum, data_reg);
269 writeb(usb_pipedevice(urb->pipe), data_reg);
270
271 sl811_write(sl811, bank + SL11H_HOSTCTLREG,
272 control | SL11H_HCTLMASK_OUT);
273 ep->length = len;
274 PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
275 !!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len);
276 }
277
278 /*-------------------------------------------------------------------------*/
279
280 /* caller updates on-chip enables later */
281
282 static inline void sofirq_on(struct sl811 *sl811)
283 {
284 if (sl811->irq_enable & SL11H_INTMASK_SOFINTR)
285 return;
286 VDBG("sof irq on\n");
287 sl811->irq_enable |= SL11H_INTMASK_SOFINTR;
288 }
289
290 static inline void sofirq_off(struct sl811 *sl811)
291 {
292 if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR))
293 return;
294 VDBG("sof irq off\n");
295 sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR;
296 }
297
298 /*-------------------------------------------------------------------------*/
299
300 /* pick the next endpoint for a transaction, and issue it.
301 * frames start with periodic transfers (after whatever is pending
302 * from the previous frame), and the rest of the time is async
303 * transfers, scheduled round-robin.
304 */
305 static struct sl811h_ep *start(struct sl811 *sl811, u8 bank)
306 {
307 struct sl811h_ep *ep;
308 struct urb *urb;
309 int fclock;
310 u8 control;
311
312 /* use endpoint at schedule head */
313 if (sl811->next_periodic) {
314 ep = sl811->next_periodic;
315 sl811->next_periodic = ep->next;
316 } else {
317 if (sl811->next_async)
318 ep = sl811->next_async;
319 else if (!list_empty(&sl811->async))
320 ep = container_of(sl811->async.next,
321 struct sl811h_ep, schedule);
322 else {
323 /* could set up the first fullspeed periodic
324 * transfer for the next frame ...
325 */
326 return NULL;
327 }
328
329 #ifdef USE_B
330 if ((bank && sl811->active_b == ep) || sl811->active_a == ep)
331 return NULL;
332 #endif
333
334 if (ep->schedule.next == &sl811->async)
335 sl811->next_async = NULL;
336 else
337 sl811->next_async = container_of(ep->schedule.next,
338 struct sl811h_ep, schedule);
339 }
340
341 if (unlikely(list_empty(&ep->hep->urb_list))) {
342 DBG("empty %p queue?\n", ep);
343 return NULL;
344 }
345
346 urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
347 control = ep->defctrl;
348
349 /* if this frame doesn't have enough time left to transfer this
350 * packet, wait till the next frame. too-simple algorithm...
351 */
352 fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6;
353 fclock -= 100; /* setup takes not much time */
354 if (urb->dev->speed == USB_SPEED_LOW) {
355 if (control & SL11H_HCTLMASK_PREAMBLE) {
356 /* also note erratum 1: some hubs won't work */
357 fclock -= 800;
358 }
359 fclock -= ep->maxpacket << 8;
360
361 /* erratum 2: AFTERSOF only works for fullspeed */
362 if (fclock < 0) {
363 if (ep->period)
364 sl811->stat_overrun++;
365 sofirq_on(sl811);
366 return NULL;
367 }
368 } else {
369 fclock -= 12000 / 19; /* 19 64byte packets/msec */
370 if (fclock < 0) {
371 if (ep->period)
372 sl811->stat_overrun++;
373 control |= SL11H_HCTLMASK_AFTERSOF;
374
375 /* throttle bulk/control irq noise */
376 } else if (ep->nak_count)
377 control |= SL11H_HCTLMASK_AFTERSOF;
378 }
379
380
381 switch (ep->nextpid) {
382 case USB_PID_IN:
383 in_packet(sl811, ep, urb, bank, control);
384 break;
385 case USB_PID_OUT:
386 out_packet(sl811, ep, urb, bank, control);
387 break;
388 case USB_PID_SETUP:
389 setup_packet(sl811, ep, urb, bank, control);
390 break;
391 case USB_PID_ACK: /* for control status */
392 status_packet(sl811, ep, urb, bank, control);
393 break;
394 default:
395 DBG("bad ep%p pid %02x\n", ep, ep->nextpid);
396 ep = NULL;
397 }
398 return ep;
399 }
400
401 #define MIN_JIFFIES ((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2)
402
403 static inline void start_transfer(struct sl811 *sl811)
404 {
405 if (sl811->port1 & USB_PORT_STAT_SUSPEND)
406 return;
407 if (sl811->active_a == NULL) {
408 sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
409 if (sl811->active_a != NULL)
410 sl811->jiffies_a = jiffies + MIN_JIFFIES;
411 }
412 #ifdef USE_B
413 if (sl811->active_b == NULL) {
414 sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
415 if (sl811->active_b != NULL)
416 sl811->jiffies_b = jiffies + MIN_JIFFIES;
417 }
418 #endif
419 }
420
421 static void finish_request(
422 struct sl811 *sl811,
423 struct sl811h_ep *ep,
424 struct urb *urb,
425 int status
426 ) __releases(sl811->lock) __acquires(sl811->lock)
427 {
428 unsigned i;
429
430 if (usb_pipecontrol(urb->pipe))
431 ep->nextpid = USB_PID_SETUP;
432
433 usb_hcd_unlink_urb_from_ep(sl811_to_hcd(sl811), urb);
434 spin_unlock(&sl811->lock);
435 usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, status);
436 spin_lock(&sl811->lock);
437
438 /* leave active endpoints in the schedule */
439 if (!list_empty(&ep->hep->urb_list))
440 return;
441
442 /* async deschedule? */
443 if (!list_empty(&ep->schedule)) {
444 list_del_init(&ep->schedule);
445 if (ep == sl811->next_async)
446 sl811->next_async = NULL;
447 return;
448 }
449
450 /* periodic deschedule */
451 DBG("deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
452 for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
453 struct sl811h_ep *temp;
454 struct sl811h_ep **prev = &sl811->periodic[i];
455
456 while (*prev && ((temp = *prev) != ep))
457 prev = &temp->next;
458 if (*prev)
459 *prev = ep->next;
460 sl811->load[i] -= ep->load;
461 }
462 ep->branch = PERIODIC_SIZE;
463 sl811->periodic_count--;
464 sl811_to_hcd(sl811)->self.bandwidth_allocated
465 -= ep->load / ep->period;
466 if (ep == sl811->next_periodic)
467 sl811->next_periodic = ep->next;
468
469 /* we might turn SOFs back on again for the async schedule */
470 if (sl811->periodic_count == 0)
471 sofirq_off(sl811);
472 }
473
474 static void
475 done(struct sl811 *sl811, struct sl811h_ep *ep, u8 bank)
476 {
477 u8 status;
478 struct urb *urb;
479 int urbstat = -EINPROGRESS;
480
481 if (unlikely(!ep))
482 return;
483
484 status = sl811_read(sl811, bank + SL11H_PKTSTATREG);
485
486 urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
487
488 /* we can safely ignore NAKs */
489 if (status & SL11H_STATMASK_NAK) {
490 // PACKET("...NAK_%02x qh%p\n", bank, ep);
491 if (!ep->period)
492 ep->nak_count++;
493 ep->error_count = 0;
494
495 /* ACK advances transfer, toggle, and maybe queue */
496 } else if (status & SL11H_STATMASK_ACK) {
497 struct usb_device *udev = urb->dev;
498 int len;
499 unsigned char *buf;
500
501 /* urb->iso_frame_desc is currently ignored here... */
502
503 ep->nak_count = ep->error_count = 0;
504 switch (ep->nextpid) {
505 case USB_PID_OUT:
506 // PACKET("...ACK/out_%02x qh%p\n", bank, ep);
507 urb->actual_length += ep->length;
508 usb_dotoggle(udev, ep->epnum, 1);
509 if (urb->actual_length
510 == urb->transfer_buffer_length) {
511 if (usb_pipecontrol(urb->pipe))
512 ep->nextpid = USB_PID_ACK;
513
514 /* some bulk protocols terminate OUT transfers
515 * by a short packet, using ZLPs not padding.
516 */
517 else if (ep->length < ep->maxpacket
518 || !(urb->transfer_flags
519 & URB_ZERO_PACKET))
520 urbstat = 0;
521 }
522 break;
523 case USB_PID_IN:
524 // PACKET("...ACK/in_%02x qh%p\n", bank, ep);
525 buf = urb->transfer_buffer + urb->actual_length;
526 prefetchw(buf);
527 len = ep->maxpacket - sl811_read(sl811,
528 bank + SL11H_XFERCNTREG);
529 if (len > ep->length) {
530 len = ep->length;
531 urbstat = -EOVERFLOW;
532 }
533 urb->actual_length += len;
534 sl811_read_buf(sl811, SL811HS_PACKET_BUF(bank == 0),
535 buf, len);
536 usb_dotoggle(udev, ep->epnum, 0);
537 if (urbstat == -EINPROGRESS &&
538 (len < ep->maxpacket ||
539 urb->actual_length ==
540 urb->transfer_buffer_length)) {
541 if (usb_pipecontrol(urb->pipe))
542 ep->nextpid = USB_PID_ACK;
543 else
544 urbstat = 0;
545 }
546 break;
547 case USB_PID_SETUP:
548 // PACKET("...ACK/setup_%02x qh%p\n", bank, ep);
549 if (urb->transfer_buffer_length == urb->actual_length)
550 ep->nextpid = USB_PID_ACK;
551 else if (usb_pipeout(urb->pipe)) {
552 usb_settoggle(udev, 0, 1, 1);
553 ep->nextpid = USB_PID_OUT;
554 } else {
555 usb_settoggle(udev, 0, 0, 1);
556 ep->nextpid = USB_PID_IN;
557 }
558 break;
559 case USB_PID_ACK:
560 // PACKET("...ACK/status_%02x qh%p\n", bank, ep);
561 urbstat = 0;
562 break;
563 }
564
565 /* STALL stops all transfers */
566 } else if (status & SL11H_STATMASK_STALL) {
567 PACKET("...STALL_%02x qh%p\n", bank, ep);
568 ep->nak_count = ep->error_count = 0;
569 urbstat = -EPIPE;
570
571 /* error? retry, until "3 strikes" */
572 } else if (++ep->error_count >= 3) {
573 if (status & SL11H_STATMASK_TMOUT)
574 urbstat = -ETIME;
575 else if (status & SL11H_STATMASK_OVF)
576 urbstat = -EOVERFLOW;
577 else
578 urbstat = -EPROTO;
579 ep->error_count = 0;
580 PACKET("...3STRIKES_%02x %02x qh%p stat %d\n",
581 bank, status, ep, urbstat);
582 }
583
584 if (urbstat != -EINPROGRESS || urb->unlinked)
585 finish_request(sl811, ep, urb, urbstat);
586 }
587
588 static inline u8 checkdone(struct sl811 *sl811)
589 {
590 u8 ctl;
591 u8 irqstat = 0;
592
593 if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) {
594 ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG));
595 if (ctl & SL11H_HCTLMASK_ARM)
596 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
597 DBG("%s DONE_A: ctrl %02x sts %02x\n",
598 (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
599 ctl,
600 sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
601 irqstat |= SL11H_INTMASK_DONE_A;
602 }
603 #ifdef USE_B
604 if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) {
605 ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG));
606 if (ctl & SL11H_HCTLMASK_ARM)
607 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
608 DBG("%s DONE_B: ctrl %02x sts %02x\n",
609 (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
610 ctl,
611 sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
612 irqstat |= SL11H_INTMASK_DONE_A;
613 }
614 #endif
615 return irqstat;
616 }
617
618 static irqreturn_t sl811h_irq(struct usb_hcd *hcd)
619 {
620 struct sl811 *sl811 = hcd_to_sl811(hcd);
621 u8 irqstat;
622 irqreturn_t ret = IRQ_NONE;
623 unsigned retries = 5;
624
625 spin_lock(&sl811->lock);
626
627 retry:
628 irqstat = sl811_read(sl811, SL11H_IRQ_STATUS) & ~SL11H_INTMASK_DP;
629 if (irqstat) {
630 sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
631 irqstat &= sl811->irq_enable;
632 }
633
634 #ifdef QUIRK2
635 /* this may no longer be necessary ... */
636 if (irqstat == 0) {
637 irqstat = checkdone(sl811);
638 if (irqstat)
639 sl811->stat_lost++;
640 }
641 #endif
642
643 /* USB packets, not necessarily handled in the order they're
644 * issued ... that's fine if they're different endpoints.
645 */
646 if (irqstat & SL11H_INTMASK_DONE_A) {
647 done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF));
648 sl811->active_a = NULL;
649 sl811->stat_a++;
650 }
651 #ifdef USE_B
652 if (irqstat & SL11H_INTMASK_DONE_B) {
653 done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF));
654 sl811->active_b = NULL;
655 sl811->stat_b++;
656 }
657 #endif
658 if (irqstat & SL11H_INTMASK_SOFINTR) {
659 unsigned index;
660
661 index = sl811->frame++ % (PERIODIC_SIZE - 1);
662 sl811->stat_sof++;
663
664 /* be graceful about almost-inevitable periodic schedule
665 * overruns: continue the previous frame's transfers iff
666 * this one has nothing scheduled.
667 */
668 if (sl811->next_periodic) {
669 // ERR("overrun to slot %d\n", index);
670 sl811->stat_overrun++;
671 }
672 if (sl811->periodic[index])
673 sl811->next_periodic = sl811->periodic[index];
674 }
675
676 /* khubd manages debouncing and wakeup */
677 if (irqstat & SL11H_INTMASK_INSRMV) {
678 sl811->stat_insrmv++;
679
680 /* most stats are reset for each VBUS session */
681 sl811->stat_wake = 0;
682 sl811->stat_sof = 0;
683 sl811->stat_a = 0;
684 sl811->stat_b = 0;
685 sl811->stat_lost = 0;
686
687 sl811->ctrl1 = 0;
688 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
689
690 sl811->irq_enable = SL11H_INTMASK_INSRMV;
691 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
692
693 /* usbcore nukes other pending transactions on disconnect */
694 if (sl811->active_a) {
695 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
696 finish_request(sl811, sl811->active_a,
697 container_of(sl811->active_a
698 ->hep->urb_list.next,
699 struct urb, urb_list),
700 -ESHUTDOWN);
701 sl811->active_a = NULL;
702 }
703 #ifdef USE_B
704 if (sl811->active_b) {
705 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
706 finish_request(sl811, sl811->active_b,
707 container_of(sl811->active_b
708 ->hep->urb_list.next,
709 struct urb, urb_list),
710 NULL, -ESHUTDOWN);
711 sl811->active_b = NULL;
712 }
713 #endif
714
715 /* port status seems weird until after reset, so
716 * force the reset and make khubd clean up later.
717 */
718 if (irqstat & SL11H_INTMASK_RD)
719 sl811->port1 &= ~USB_PORT_STAT_CONNECTION;
720 else
721 sl811->port1 |= USB_PORT_STAT_CONNECTION;
722
723 sl811->port1 |= USB_PORT_STAT_C_CONNECTION << 16;
724
725 } else if (irqstat & SL11H_INTMASK_RD) {
726 if (sl811->port1 & USB_PORT_STAT_SUSPEND) {
727 DBG("wakeup\n");
728 sl811->port1 |= USB_PORT_STAT_C_SUSPEND << 16;
729 sl811->stat_wake++;
730 } else
731 irqstat &= ~SL11H_INTMASK_RD;
732 }
733
734 if (irqstat) {
735 if (sl811->port1 & USB_PORT_STAT_ENABLE)
736 start_transfer(sl811);
737 ret = IRQ_HANDLED;
738 if (retries--)
739 goto retry;
740 }
741
742 if (sl811->periodic_count == 0 && list_empty(&sl811->async))
743 sofirq_off(sl811);
744 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
745
746 spin_unlock(&sl811->lock);
747
748 return ret;
749 }
750
751 /*-------------------------------------------------------------------------*/
752
753 /* usb 1.1 says max 90% of a frame is available for periodic transfers.
754 * this driver doesn't promise that much since it's got to handle an
755 * IRQ per packet; irq handling latencies also use up that time.
756 *
757 * NOTE: the periodic schedule is a sparse tree, with the load for
758 * each branch minimized. see fig 3.5 in the OHCI spec for example.
759 */
760 #define MAX_PERIODIC_LOAD 500 /* out of 1000 usec */
761
762 static int balance(struct sl811 *sl811, u16 period, u16 load)
763 {
764 int i, branch = -ENOSPC;
765
766 /* search for the least loaded schedule branch of that period
767 * which has enough bandwidth left unreserved.
768 */
769 for (i = 0; i < period ; i++) {
770 if (branch < 0 || sl811->load[branch] > sl811->load[i]) {
771 int j;
772
773 for (j = i; j < PERIODIC_SIZE; j += period) {
774 if ((sl811->load[j] + load)
775 > MAX_PERIODIC_LOAD)
776 break;
777 }
778 if (j < PERIODIC_SIZE)
779 continue;
780 branch = i;
781 }
782 }
783 return branch;
784 }
785
786 /*-------------------------------------------------------------------------*/
787
788 static int sl811h_urb_enqueue(
789 struct usb_hcd *hcd,
790 struct urb *urb,
791 gfp_t mem_flags
792 ) {
793 struct sl811 *sl811 = hcd_to_sl811(hcd);
794 struct usb_device *udev = urb->dev;
795 unsigned int pipe = urb->pipe;
796 int is_out = !usb_pipein(pipe);
797 int type = usb_pipetype(pipe);
798 int epnum = usb_pipeendpoint(pipe);
799 struct sl811h_ep *ep = NULL;
800 unsigned long flags;
801 int i;
802 int retval;
803 struct usb_host_endpoint *hep = urb->ep;
804
805 #ifndef CONFIG_USB_SL811_HCD_ISO
806 if (type == PIPE_ISOCHRONOUS)
807 return -ENOSPC;
808 #endif
809
810 /* avoid all allocations within spinlocks */
811 if (!hep->hcpriv) {
812 ep = kzalloc(sizeof *ep, mem_flags);
813 if (ep == NULL)
814 return -ENOMEM;
815 }
816
817 spin_lock_irqsave(&sl811->lock, flags);
818
819 /* don't submit to a dead or disabled port */
820 if (!(sl811->port1 & USB_PORT_STAT_ENABLE)
821 || !HC_IS_RUNNING(hcd->state)) {
822 retval = -ENODEV;
823 kfree(ep);
824 goto fail_not_linked;
825 }
826 retval = usb_hcd_link_urb_to_ep(hcd, urb);
827 if (retval) {
828 kfree(ep);
829 goto fail_not_linked;
830 }
831
832 if (hep->hcpriv) {
833 kfree(ep);
834 ep = hep->hcpriv;
835 } else if (!ep) {
836 retval = -ENOMEM;
837 goto fail;
838
839 } else {
840 INIT_LIST_HEAD(&ep->schedule);
841 ep->udev = udev;
842 ep->epnum = epnum;
843 ep->maxpacket = usb_maxpacket(udev, urb->pipe, is_out);
844 ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE;
845 usb_settoggle(udev, epnum, is_out, 0);
846
847 if (type == PIPE_CONTROL)
848 ep->nextpid = USB_PID_SETUP;
849 else if (is_out)
850 ep->nextpid = USB_PID_OUT;
851 else
852 ep->nextpid = USB_PID_IN;
853
854 if (ep->maxpacket > H_MAXPACKET) {
855 /* iso packets up to 240 bytes could work... */
856 DBG("dev %d ep%d maxpacket %d\n",
857 udev->devnum, epnum, ep->maxpacket);
858 retval = -EINVAL;
859 kfree(ep);
860 goto fail;
861 }
862
863 if (udev->speed == USB_SPEED_LOW) {
864 /* send preamble for external hub? */
865 if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD))
866 ep->defctrl |= SL11H_HCTLMASK_PREAMBLE;
867 }
868 switch (type) {
869 case PIPE_ISOCHRONOUS:
870 case PIPE_INTERRUPT:
871 if (urb->interval > PERIODIC_SIZE)
872 urb->interval = PERIODIC_SIZE;
873 ep->period = urb->interval;
874 ep->branch = PERIODIC_SIZE;
875 if (type == PIPE_ISOCHRONOUS)
876 ep->defctrl |= SL11H_HCTLMASK_ISOCH;
877 ep->load = usb_calc_bus_time(udev->speed, !is_out,
878 (type == PIPE_ISOCHRONOUS),
879 usb_maxpacket(udev, pipe, is_out))
880 / 1000;
881 break;
882 }
883
884 ep->hep = hep;
885 hep->hcpriv = ep;
886 }
887
888 /* maybe put endpoint into schedule */
889 switch (type) {
890 case PIPE_CONTROL:
891 case PIPE_BULK:
892 if (list_empty(&ep->schedule))
893 list_add_tail(&ep->schedule, &sl811->async);
894 break;
895 case PIPE_ISOCHRONOUS:
896 case PIPE_INTERRUPT:
897 urb->interval = ep->period;
898 if (ep->branch < PERIODIC_SIZE) {
899 /* NOTE: the phase is correct here, but the value
900 * needs offsetting by the transfer queue depth.
901 * All current drivers ignore start_frame, so this
902 * is unlikely to ever matter...
903 */
904 urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
905 + ep->branch;
906 break;
907 }
908
909 retval = balance(sl811, ep->period, ep->load);
910 if (retval < 0)
911 goto fail;
912 ep->branch = retval;
913 retval = 0;
914 urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
915 + ep->branch;
916
917 /* sort each schedule branch by period (slow before fast)
918 * to share the faster parts of the tree without needing
919 * dummy/placeholder nodes
920 */
921 DBG("schedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
922 for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
923 struct sl811h_ep **prev = &sl811->periodic[i];
924 struct sl811h_ep *here = *prev;
925
926 while (here && ep != here) {
927 if (ep->period > here->period)
928 break;
929 prev = &here->next;
930 here = *prev;
931 }
932 if (ep != here) {
933 ep->next = here;
934 *prev = ep;
935 }
936 sl811->load[i] += ep->load;
937 }
938 sl811->periodic_count++;
939 hcd->self.bandwidth_allocated += ep->load / ep->period;
940 sofirq_on(sl811);
941 }
942
943 urb->hcpriv = hep;
944 start_transfer(sl811);
945 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
946 fail:
947 if (retval)
948 usb_hcd_unlink_urb_from_ep(hcd, urb);
949 fail_not_linked:
950 spin_unlock_irqrestore(&sl811->lock, flags);
951 return retval;
952 }
953
954 static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
955 {
956 struct sl811 *sl811 = hcd_to_sl811(hcd);
957 struct usb_host_endpoint *hep;
958 unsigned long flags;
959 struct sl811h_ep *ep;
960 int retval;
961
962 spin_lock_irqsave(&sl811->lock, flags);
963 retval = usb_hcd_check_unlink_urb(hcd, urb, status);
964 if (retval)
965 goto fail;
966
967 hep = urb->hcpriv;
968 ep = hep->hcpriv;
969 if (ep) {
970 /* finish right away if this urb can't be active ...
971 * note that some drivers wrongly expect delays
972 */
973 if (ep->hep->urb_list.next != &urb->urb_list) {
974 /* not front of queue? never active */
975
976 /* for active transfers, we expect an IRQ */
977 } else if (sl811->active_a == ep) {
978 if (time_before_eq(sl811->jiffies_a, jiffies)) {
979 /* happens a lot with lowspeed?? */
980 DBG("giveup on DONE_A: ctrl %02x sts %02x\n",
981 sl811_read(sl811,
982 SL811_EP_A(SL11H_HOSTCTLREG)),
983 sl811_read(sl811,
984 SL811_EP_A(SL11H_PKTSTATREG)));
985 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
986 0);
987 sl811->active_a = NULL;
988 } else
989 urb = NULL;
990 #ifdef USE_B
991 } else if (sl811->active_b == ep) {
992 if (time_before_eq(sl811->jiffies_a, jiffies)) {
993 /* happens a lot with lowspeed?? */
994 DBG("giveup on DONE_B: ctrl %02x sts %02x\n",
995 sl811_read(sl811,
996 SL811_EP_B(SL11H_HOSTCTLREG)),
997 sl811_read(sl811,
998 SL811_EP_B(SL11H_PKTSTATREG)));
999 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG),
1000 0);
1001 sl811->active_b = NULL;
1002 } else
1003 urb = NULL;
1004 #endif
1005 } else {
1006 /* front of queue for inactive endpoint */
1007 }
1008
1009 if (urb)
1010 finish_request(sl811, ep, urb, 0);
1011 else
1012 VDBG("dequeue, urb %p active %s; wait4irq\n", urb,
1013 (sl811->active_a == ep) ? "A" : "B");
1014 } else
1015 retval = -EINVAL;
1016 fail:
1017 spin_unlock_irqrestore(&sl811->lock, flags);
1018 return retval;
1019 }
1020
1021 static void
1022 sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
1023 {
1024 struct sl811h_ep *ep = hep->hcpriv;
1025
1026 if (!ep)
1027 return;
1028
1029 /* assume we'd just wait for the irq */
1030 if (!list_empty(&hep->urb_list))
1031 msleep(3);
1032 if (!list_empty(&hep->urb_list))
1033 WARNING("ep %p not empty?\n", ep);
1034
1035 kfree(ep);
1036 hep->hcpriv = NULL;
1037 }
1038
1039 static int
1040 sl811h_get_frame(struct usb_hcd *hcd)
1041 {
1042 struct sl811 *sl811 = hcd_to_sl811(hcd);
1043
1044 /* wrong except while periodic transfers are scheduled;
1045 * never matches the on-the-wire frame;
1046 * subject to overruns.
1047 */
1048 return sl811->frame;
1049 }
1050
1051
1052 /*-------------------------------------------------------------------------*/
1053
1054 /* the virtual root hub timer IRQ checks for hub status */
1055 static int
1056 sl811h_hub_status_data(struct usb_hcd *hcd, char *buf)
1057 {
1058 struct sl811 *sl811 = hcd_to_sl811(hcd);
1059 #ifdef QUIRK3
1060 unsigned long flags;
1061
1062 /* non-SMP HACK: use root hub timer as i/o watchdog
1063 * this seems essential when SOF IRQs aren't in use...
1064 */
1065 local_irq_save(flags);
1066 if (!timer_pending(&sl811->timer)) {
1067 if (sl811h_irq( /* ~0, */ hcd) != IRQ_NONE)
1068 sl811->stat_lost++;
1069 }
1070 local_irq_restore(flags);
1071 #endif
1072
1073 if (!(sl811->port1 & (0xffff << 16)))
1074 return 0;
1075
1076 /* tell khubd port 1 changed */
1077 *buf = (1 << 1);
1078 return 1;
1079 }
1080
1081 static void
1082 sl811h_hub_descriptor (
1083 struct sl811 *sl811,
1084 struct usb_hub_descriptor *desc
1085 ) {
1086 u16 temp = 0;
1087
1088 desc->bDescriptorType = 0x29;
1089 desc->bHubContrCurrent = 0;
1090
1091 desc->bNbrPorts = 1;
1092 desc->bDescLength = 9;
1093
1094 /* per-port power switching (gang of one!), or none */
1095 desc->bPwrOn2PwrGood = 0;
1096 if (sl811->board && sl811->board->port_power) {
1097 desc->bPwrOn2PwrGood = sl811->board->potpg;
1098 if (!desc->bPwrOn2PwrGood)
1099 desc->bPwrOn2PwrGood = 10;
1100 temp = 0x0001;
1101 } else
1102 temp = 0x0002;
1103
1104 /* no overcurrent errors detection/handling */
1105 temp |= 0x0010;
1106
1107 desc->wHubCharacteristics = cpu_to_le16(temp);
1108
1109 /* ports removable, and legacy PortPwrCtrlMask */
1110 desc->u.hs.DeviceRemovable[0] = 0 << 1;
1111 desc->u.hs.DeviceRemovable[1] = ~0;
1112 }
1113
1114 static void
1115 sl811h_timer(unsigned long _sl811)
1116 {
1117 struct sl811 *sl811 = (void *) _sl811;
1118 unsigned long flags;
1119 u8 irqstat;
1120 u8 signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE;
1121 const u32 mask = USB_PORT_STAT_CONNECTION
1122 | USB_PORT_STAT_ENABLE
1123 | USB_PORT_STAT_LOW_SPEED;
1124
1125 spin_lock_irqsave(&sl811->lock, flags);
1126
1127 /* stop special signaling */
1128 sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE;
1129 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1130 udelay(3);
1131
1132 irqstat = sl811_read(sl811, SL11H_IRQ_STATUS);
1133
1134 switch (signaling) {
1135 case SL11H_CTL1MASK_SE0:
1136 DBG("end reset\n");
1137 sl811->port1 = (USB_PORT_STAT_C_RESET << 16)
1138 | USB_PORT_STAT_POWER;
1139 sl811->ctrl1 = 0;
1140 /* don't wrongly ack RD */
1141 if (irqstat & SL11H_INTMASK_INSRMV)
1142 irqstat &= ~SL11H_INTMASK_RD;
1143 break;
1144 case SL11H_CTL1MASK_K:
1145 DBG("end resume\n");
1146 sl811->port1 &= ~USB_PORT_STAT_SUSPEND;
1147 break;
1148 default:
1149 DBG("odd timer signaling: %02x\n", signaling);
1150 break;
1151 }
1152 sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
1153
1154 if (irqstat & SL11H_INTMASK_RD) {
1155 /* usbcore nukes all pending transactions on disconnect */
1156 if (sl811->port1 & USB_PORT_STAT_CONNECTION)
1157 sl811->port1 |= (USB_PORT_STAT_C_CONNECTION << 16)
1158 | (USB_PORT_STAT_C_ENABLE << 16);
1159 sl811->port1 &= ~mask;
1160 sl811->irq_enable = SL11H_INTMASK_INSRMV;
1161 } else {
1162 sl811->port1 |= mask;
1163 if (irqstat & SL11H_INTMASK_DP)
1164 sl811->port1 &= ~USB_PORT_STAT_LOW_SPEED;
1165 sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD;
1166 }
1167
1168 if (sl811->port1 & USB_PORT_STAT_CONNECTION) {
1169 u8 ctrl2 = SL811HS_CTL2_INIT;
1170
1171 sl811->irq_enable |= SL11H_INTMASK_DONE_A;
1172 #ifdef USE_B
1173 sl811->irq_enable |= SL11H_INTMASK_DONE_B;
1174 #endif
1175 if (sl811->port1 & USB_PORT_STAT_LOW_SPEED) {
1176 sl811->ctrl1 |= SL11H_CTL1MASK_LSPD;
1177 ctrl2 |= SL811HS_CTL2MASK_DSWAP;
1178 }
1179
1180 /* start SOFs flowing, kickstarting with A registers */
1181 sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA;
1182 sl811_write(sl811, SL11H_SOFLOWREG, 0xe0);
1183 sl811_write(sl811, SL811HS_CTLREG2, ctrl2);
1184
1185 /* autoincrementing */
1186 sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0);
1187 writeb(SL_SOF, sl811->data_reg);
1188 writeb(0, sl811->data_reg);
1189 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1190 SL11H_HCTLMASK_ARM);
1191
1192 /* khubd provides debounce delay */
1193 } else {
1194 sl811->ctrl1 = 0;
1195 }
1196 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1197
1198 /* reenable irqs */
1199 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
1200 spin_unlock_irqrestore(&sl811->lock, flags);
1201 }
1202
1203 static int
1204 sl811h_hub_control(
1205 struct usb_hcd *hcd,
1206 u16 typeReq,
1207 u16 wValue,
1208 u16 wIndex,
1209 char *buf,
1210 u16 wLength
1211 ) {
1212 struct sl811 *sl811 = hcd_to_sl811(hcd);
1213 int retval = 0;
1214 unsigned long flags;
1215
1216 spin_lock_irqsave(&sl811->lock, flags);
1217
1218 switch (typeReq) {
1219 case ClearHubFeature:
1220 case SetHubFeature:
1221 switch (wValue) {
1222 case C_HUB_OVER_CURRENT:
1223 case C_HUB_LOCAL_POWER:
1224 break;
1225 default:
1226 goto error;
1227 }
1228 break;
1229 case ClearPortFeature:
1230 if (wIndex != 1 || wLength != 0)
1231 goto error;
1232
1233 switch (wValue) {
1234 case USB_PORT_FEAT_ENABLE:
1235 sl811->port1 &= USB_PORT_STAT_POWER;
1236 sl811->ctrl1 = 0;
1237 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1238 sl811->irq_enable = SL11H_INTMASK_INSRMV;
1239 sl811_write(sl811, SL11H_IRQ_ENABLE,
1240 sl811->irq_enable);
1241 break;
1242 case USB_PORT_FEAT_SUSPEND:
1243 if (!(sl811->port1 & USB_PORT_STAT_SUSPEND))
1244 break;
1245
1246 /* 20 msec of resume/K signaling, other irqs blocked */
1247 DBG("start resume...\n");
1248 sl811->irq_enable = 0;
1249 sl811_write(sl811, SL11H_IRQ_ENABLE,
1250 sl811->irq_enable);
1251 sl811->ctrl1 |= SL11H_CTL1MASK_K;
1252 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1253
1254 mod_timer(&sl811->timer, jiffies
1255 + msecs_to_jiffies(20));
1256 break;
1257 case USB_PORT_FEAT_POWER:
1258 port_power(sl811, 0);
1259 break;
1260 case USB_PORT_FEAT_C_ENABLE:
1261 case USB_PORT_FEAT_C_SUSPEND:
1262 case USB_PORT_FEAT_C_CONNECTION:
1263 case USB_PORT_FEAT_C_OVER_CURRENT:
1264 case USB_PORT_FEAT_C_RESET:
1265 break;
1266 default:
1267 goto error;
1268 }
1269 sl811->port1 &= ~(1 << wValue);
1270 break;
1271 case GetHubDescriptor:
1272 sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf);
1273 break;
1274 case GetHubStatus:
1275 put_unaligned_le32(0, buf);
1276 break;
1277 case GetPortStatus:
1278 if (wIndex != 1)
1279 goto error;
1280 put_unaligned_le32(sl811->port1, buf);
1281
1282 #ifndef VERBOSE
1283 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
1284 #endif
1285 DBG("GetPortStatus %08x\n", sl811->port1);
1286 break;
1287 case SetPortFeature:
1288 if (wIndex != 1 || wLength != 0)
1289 goto error;
1290 switch (wValue) {
1291 case USB_PORT_FEAT_SUSPEND:
1292 if (sl811->port1 & USB_PORT_STAT_RESET)
1293 goto error;
1294 if (!(sl811->port1 & USB_PORT_STAT_ENABLE))
1295 goto error;
1296
1297 DBG("suspend...\n");
1298 sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA;
1299 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1300 break;
1301 case USB_PORT_FEAT_POWER:
1302 port_power(sl811, 1);
1303 break;
1304 case USB_PORT_FEAT_RESET:
1305 if (sl811->port1 & USB_PORT_STAT_SUSPEND)
1306 goto error;
1307 if (!(sl811->port1 & USB_PORT_STAT_POWER))
1308 break;
1309
1310 /* 50 msec of reset/SE0 signaling, irqs blocked */
1311 sl811->irq_enable = 0;
1312 sl811_write(sl811, SL11H_IRQ_ENABLE,
1313 sl811->irq_enable);
1314 sl811->ctrl1 = SL11H_CTL1MASK_SE0;
1315 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1316 sl811->port1 |= USB_PORT_STAT_RESET;
1317 mod_timer(&sl811->timer, jiffies
1318 + msecs_to_jiffies(50));
1319 break;
1320 default:
1321 goto error;
1322 }
1323 sl811->port1 |= 1 << wValue;
1324 break;
1325
1326 default:
1327 error:
1328 /* "protocol stall" on error */
1329 retval = -EPIPE;
1330 }
1331
1332 spin_unlock_irqrestore(&sl811->lock, flags);
1333 return retval;
1334 }
1335
1336 #ifdef CONFIG_PM
1337
1338 static int
1339 sl811h_bus_suspend(struct usb_hcd *hcd)
1340 {
1341 // SOFs off
1342 DBG("%s\n", __func__);
1343 return 0;
1344 }
1345
1346 static int
1347 sl811h_bus_resume(struct usb_hcd *hcd)
1348 {
1349 // SOFs on
1350 DBG("%s\n", __func__);
1351 return 0;
1352 }
1353
1354 #else
1355
1356 #define sl811h_bus_suspend NULL
1357 #define sl811h_bus_resume NULL
1358
1359 #endif
1360
1361
1362 /*-------------------------------------------------------------------------*/
1363
1364 #ifdef STUB_DEBUG_FILE
1365
1366 static inline void create_debug_file(struct sl811 *sl811) { }
1367 static inline void remove_debug_file(struct sl811 *sl811) { }
1368
1369 #else
1370
1371 #include <linux/proc_fs.h>
1372 #include <linux/seq_file.h>
1373
1374 static void dump_irq(struct seq_file *s, char *label, u8 mask)
1375 {
1376 seq_printf(s, "%s %02x%s%s%s%s%s%s\n", label, mask,
1377 (mask & SL11H_INTMASK_DONE_A) ? " done_a" : "",
1378 (mask & SL11H_INTMASK_DONE_B) ? " done_b" : "",
1379 (mask & SL11H_INTMASK_SOFINTR) ? " sof" : "",
1380 (mask & SL11H_INTMASK_INSRMV) ? " ins/rmv" : "",
1381 (mask & SL11H_INTMASK_RD) ? " rd" : "",
1382 (mask & SL11H_INTMASK_DP) ? " dp" : "");
1383 }
1384
1385 static int proc_sl811h_show(struct seq_file *s, void *unused)
1386 {
1387 struct sl811 *sl811 = s->private;
1388 struct sl811h_ep *ep;
1389 unsigned i;
1390
1391 seq_printf(s, "%s\n%s version %s\nportstatus[1] = %08x\n",
1392 sl811_to_hcd(sl811)->product_desc,
1393 hcd_name, DRIVER_VERSION,
1394 sl811->port1);
1395
1396 seq_printf(s, "insert/remove: %ld\n", sl811->stat_insrmv);
1397 seq_printf(s, "current session: done_a %ld done_b %ld "
1398 "wake %ld sof %ld overrun %ld lost %ld\n\n",
1399 sl811->stat_a, sl811->stat_b,
1400 sl811->stat_wake, sl811->stat_sof,
1401 sl811->stat_overrun, sl811->stat_lost);
1402
1403 spin_lock_irq(&sl811->lock);
1404
1405 if (sl811->ctrl1 & SL11H_CTL1MASK_SUSPEND)
1406 seq_printf(s, "(suspended)\n\n");
1407 else {
1408 u8 t = sl811_read(sl811, SL11H_CTLREG1);
1409
1410 seq_printf(s, "ctrl1 %02x%s%s%s%s\n", t,
1411 (t & SL11H_CTL1MASK_SOF_ENA) ? " sofgen" : "",
1412 ({char *s; switch (t & SL11H_CTL1MASK_FORCE) {
1413 case SL11H_CTL1MASK_NORMAL: s = ""; break;
1414 case SL11H_CTL1MASK_SE0: s = " se0/reset"; break;
1415 case SL11H_CTL1MASK_K: s = " k/resume"; break;
1416 default: s = "j"; break;
1417 }; s; }),
1418 (t & SL11H_CTL1MASK_LSPD) ? " lowspeed" : "",
1419 (t & SL11H_CTL1MASK_SUSPEND) ? " suspend" : "");
1420
1421 dump_irq(s, "irq_enable",
1422 sl811_read(sl811, SL11H_IRQ_ENABLE));
1423 dump_irq(s, "irq_status",
1424 sl811_read(sl811, SL11H_IRQ_STATUS));
1425 seq_printf(s, "frame clocks remaining: %d\n",
1426 sl811_read(sl811, SL11H_SOFTMRREG) << 6);
1427 }
1428
1429 seq_printf(s, "A: qh%p ctl %02x sts %02x\n", sl811->active_a,
1430 sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)),
1431 sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
1432 seq_printf(s, "B: qh%p ctl %02x sts %02x\n", sl811->active_b,
1433 sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)),
1434 sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
1435 seq_printf(s, "\n");
1436 list_for_each_entry (ep, &sl811->async, schedule) {
1437 struct urb *urb;
1438
1439 seq_printf(s, "%s%sqh%p, ep%d%s, maxpacket %d"
1440 " nak %d err %d\n",
1441 (ep == sl811->active_a) ? "(A) " : "",
1442 (ep == sl811->active_b) ? "(B) " : "",
1443 ep, ep->epnum,
1444 ({ char *s; switch (ep->nextpid) {
1445 case USB_PID_IN: s = "in"; break;
1446 case USB_PID_OUT: s = "out"; break;
1447 case USB_PID_SETUP: s = "setup"; break;
1448 case USB_PID_ACK: s = "status"; break;
1449 default: s = "?"; break;
1450 }; s;}),
1451 ep->maxpacket,
1452 ep->nak_count, ep->error_count);
1453 list_for_each_entry (urb, &ep->hep->urb_list, urb_list) {
1454 seq_printf(s, " urb%p, %d/%d\n", urb,
1455 urb->actual_length,
1456 urb->transfer_buffer_length);
1457 }
1458 }
1459 if (!list_empty(&sl811->async))
1460 seq_printf(s, "\n");
1461
1462 seq_printf(s, "periodic size= %d\n", PERIODIC_SIZE);
1463
1464 for (i = 0; i < PERIODIC_SIZE; i++) {
1465 ep = sl811->periodic[i];
1466 if (!ep)
1467 continue;
1468 seq_printf(s, "%2d [%3d]:\n", i, sl811->load[i]);
1469
1470 /* DUMB: prints shared entries multiple times */
1471 do {
1472 seq_printf(s,
1473 " %s%sqh%d/%p (%sdev%d ep%d%s max %d) "
1474 "err %d\n",
1475 (ep == sl811->active_a) ? "(A) " : "",
1476 (ep == sl811->active_b) ? "(B) " : "",
1477 ep->period, ep,
1478 (ep->udev->speed == USB_SPEED_FULL)
1479 ? "" : "ls ",
1480 ep->udev->devnum, ep->epnum,
1481 (ep->epnum == 0) ? ""
1482 : ((ep->nextpid == USB_PID_IN)
1483 ? "in"
1484 : "out"),
1485 ep->maxpacket, ep->error_count);
1486 ep = ep->next;
1487 } while (ep);
1488 }
1489
1490 spin_unlock_irq(&sl811->lock);
1491 seq_printf(s, "\n");
1492
1493 return 0;
1494 }
1495
1496 static int proc_sl811h_open(struct inode *inode, struct file *file)
1497 {
1498 return single_open(file, proc_sl811h_show, PDE(inode)->data);
1499 }
1500
1501 static const struct file_operations proc_ops = {
1502 .open = proc_sl811h_open,
1503 .read = seq_read,
1504 .llseek = seq_lseek,
1505 .release = single_release,
1506 };
1507
1508 /* expect just one sl811 per system */
1509 static const char proc_filename[] = "driver/sl811h";
1510
1511 static void create_debug_file(struct sl811 *sl811)
1512 {
1513 sl811->pde = proc_create_data(proc_filename, 0, NULL, &proc_ops, sl811);
1514 }
1515
1516 static void remove_debug_file(struct sl811 *sl811)
1517 {
1518 if (sl811->pde)
1519 remove_proc_entry(proc_filename, NULL);
1520 }
1521
1522 #endif
1523
1524 /*-------------------------------------------------------------------------*/
1525
1526 static void
1527 sl811h_stop(struct usb_hcd *hcd)
1528 {
1529 struct sl811 *sl811 = hcd_to_sl811(hcd);
1530 unsigned long flags;
1531
1532 del_timer_sync(&hcd->rh_timer);
1533
1534 spin_lock_irqsave(&sl811->lock, flags);
1535 port_power(sl811, 0);
1536 spin_unlock_irqrestore(&sl811->lock, flags);
1537 }
1538
1539 static int
1540 sl811h_start(struct usb_hcd *hcd)
1541 {
1542 struct sl811 *sl811 = hcd_to_sl811(hcd);
1543
1544 /* chip has been reset, VBUS power is off */
1545 hcd->state = HC_STATE_RUNNING;
1546
1547 if (sl811->board) {
1548 if (!device_can_wakeup(hcd->self.controller))
1549 device_init_wakeup(hcd->self.controller,
1550 sl811->board->can_wakeup);
1551 hcd->power_budget = sl811->board->power * 2;
1552 }
1553
1554 /* enable power and interrupts */
1555 port_power(sl811, 1);
1556
1557 return 0;
1558 }
1559
1560 /*-------------------------------------------------------------------------*/
1561
1562 static struct hc_driver sl811h_hc_driver = {
1563 .description = hcd_name,
1564 .hcd_priv_size = sizeof(struct sl811),
1565
1566 /*
1567 * generic hardware linkage
1568 */
1569 .irq = sl811h_irq,
1570 .flags = HCD_USB11 | HCD_MEMORY,
1571
1572 /* Basic lifecycle operations */
1573 .start = sl811h_start,
1574 .stop = sl811h_stop,
1575
1576 /*
1577 * managing i/o requests and associated device resources
1578 */
1579 .urb_enqueue = sl811h_urb_enqueue,
1580 .urb_dequeue = sl811h_urb_dequeue,
1581 .endpoint_disable = sl811h_endpoint_disable,
1582
1583 /*
1584 * periodic schedule support
1585 */
1586 .get_frame_number = sl811h_get_frame,
1587
1588 /*
1589 * root hub support
1590 */
1591 .hub_status_data = sl811h_hub_status_data,
1592 .hub_control = sl811h_hub_control,
1593 .bus_suspend = sl811h_bus_suspend,
1594 .bus_resume = sl811h_bus_resume,
1595 };
1596
1597 /*-------------------------------------------------------------------------*/
1598
1599 static int __devexit
1600 sl811h_remove(struct platform_device *dev)
1601 {
1602 struct usb_hcd *hcd = platform_get_drvdata(dev);
1603 struct sl811 *sl811 = hcd_to_sl811(hcd);
1604 struct resource *res;
1605
1606 remove_debug_file(sl811);
1607 usb_remove_hcd(hcd);
1608
1609 /* some platforms may use IORESOURCE_IO */
1610 res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1611 if (res)
1612 iounmap(sl811->data_reg);
1613
1614 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1615 if (res)
1616 iounmap(sl811->addr_reg);
1617
1618 usb_put_hcd(hcd);
1619 return 0;
1620 }
1621
1622 static int __devinit
1623 sl811h_probe(struct platform_device *dev)
1624 {
1625 struct usb_hcd *hcd;
1626 struct sl811 *sl811;
1627 struct resource *addr, *data, *ires;
1628 int irq;
1629 void __iomem *addr_reg;
1630 void __iomem *data_reg;
1631 int retval;
1632 u8 tmp, ioaddr = 0;
1633 unsigned long irqflags;
1634
1635 /* basic sanity checks first. board-specific init logic should
1636 * have initialized these three resources and probably board
1637 * specific platform_data. we don't probe for IRQs, and do only
1638 * minimal sanity checking.
1639 */
1640 ires = platform_get_resource(dev, IORESOURCE_IRQ, 0);
1641 if (dev->num_resources < 3 || !ires)
1642 return -ENODEV;
1643
1644 irq = ires->start;
1645 irqflags = ires->flags & IRQF_TRIGGER_MASK;
1646
1647 /* refuse to confuse usbcore */
1648 if (dev->dev.dma_mask) {
1649 DBG("no we won't dma\n");
1650 return -EINVAL;
1651 }
1652
1653 /* the chip may be wired for either kind of addressing */
1654 addr = platform_get_resource(dev, IORESOURCE_MEM, 0);
1655 data = platform_get_resource(dev, IORESOURCE_MEM, 1);
1656 retval = -EBUSY;
1657 if (!addr || !data) {
1658 addr = platform_get_resource(dev, IORESOURCE_IO, 0);
1659 data = platform_get_resource(dev, IORESOURCE_IO, 1);
1660 if (!addr || !data)
1661 return -ENODEV;
1662 ioaddr = 1;
1663 /*
1664 * NOTE: 64-bit resource->start is getting truncated
1665 * to avoid compiler warning, assuming that ->start
1666 * is always 32-bit for this case
1667 */
1668 addr_reg = (void __iomem *) (unsigned long) addr->start;
1669 data_reg = (void __iomem *) (unsigned long) data->start;
1670 } else {
1671 addr_reg = ioremap(addr->start, 1);
1672 if (addr_reg == NULL) {
1673 retval = -ENOMEM;
1674 goto err2;
1675 }
1676
1677 data_reg = ioremap(data->start, 1);
1678 if (data_reg == NULL) {
1679 retval = -ENOMEM;
1680 goto err4;
1681 }
1682 }
1683
1684 /* allocate and initialize hcd */
1685 hcd = usb_create_hcd(&sl811h_hc_driver, &dev->dev, dev_name(&dev->dev));
1686 if (!hcd) {
1687 retval = -ENOMEM;
1688 goto err5;
1689 }
1690 hcd->rsrc_start = addr->start;
1691 sl811 = hcd_to_sl811(hcd);
1692
1693 spin_lock_init(&sl811->lock);
1694 INIT_LIST_HEAD(&sl811->async);
1695 sl811->board = dev->dev.platform_data;
1696 init_timer(&sl811->timer);
1697 sl811->timer.function = sl811h_timer;
1698 sl811->timer.data = (unsigned long) sl811;
1699 sl811->addr_reg = addr_reg;
1700 sl811->data_reg = data_reg;
1701
1702 spin_lock_irq(&sl811->lock);
1703 port_power(sl811, 0);
1704 spin_unlock_irq(&sl811->lock);
1705 msleep(200);
1706
1707 tmp = sl811_read(sl811, SL11H_HWREVREG);
1708 switch (tmp >> 4) {
1709 case 1:
1710 hcd->product_desc = "SL811HS v1.2";
1711 break;
1712 case 2:
1713 hcd->product_desc = "SL811HS v1.5";
1714 break;
1715 default:
1716 /* reject case 0, SL11S is less functional */
1717 DBG("chiprev %02x\n", tmp);
1718 retval = -ENXIO;
1719 goto err6;
1720 }
1721
1722 /* The chip's IRQ is level triggered, active high. A requirement
1723 * for platform device setup is to cope with things like signal
1724 * inverters (e.g. CF is active low) or working only with edge
1725 * triggers (e.g. most ARM CPUs). Initial driver stress testing
1726 * was on a system with single edge triggering, so most sorts of
1727 * triggering arrangement should work.
1728 *
1729 * Use resource IRQ flags if set by platform device setup.
1730 */
1731 irqflags |= IRQF_SHARED;
1732 retval = usb_add_hcd(hcd, irq, irqflags);
1733 if (retval != 0)
1734 goto err6;
1735
1736 create_debug_file(sl811);
1737 return retval;
1738
1739 err6:
1740 usb_put_hcd(hcd);
1741 err5:
1742 if (!ioaddr)
1743 iounmap(data_reg);
1744 err4:
1745 if (!ioaddr)
1746 iounmap(addr_reg);
1747 err2:
1748 DBG("init error, %d\n", retval);
1749 return retval;
1750 }
1751
1752 #ifdef CONFIG_PM
1753
1754 /* for this device there's no useful distinction between the controller
1755 * and its root hub, except that the root hub only gets direct PM calls
1756 * when CONFIG_USB_SUSPEND is enabled.
1757 */
1758
1759 static int
1760 sl811h_suspend(struct platform_device *dev, pm_message_t state)
1761 {
1762 struct usb_hcd *hcd = platform_get_drvdata(dev);
1763 struct sl811 *sl811 = hcd_to_sl811(hcd);
1764 int retval = 0;
1765
1766 switch (state.event) {
1767 case PM_EVENT_FREEZE:
1768 retval = sl811h_bus_suspend(hcd);
1769 break;
1770 case PM_EVENT_SUSPEND:
1771 case PM_EVENT_HIBERNATE:
1772 case PM_EVENT_PRETHAW: /* explicitly discard hw state */
1773 port_power(sl811, 0);
1774 break;
1775 }
1776 return retval;
1777 }
1778
1779 static int
1780 sl811h_resume(struct platform_device *dev)
1781 {
1782 struct usb_hcd *hcd = platform_get_drvdata(dev);
1783 struct sl811 *sl811 = hcd_to_sl811(hcd);
1784
1785 /* with no "check to see if VBUS is still powered" board hook,
1786 * let's assume it'd only be powered to enable remote wakeup.
1787 */
1788 if (!sl811->port1 || !device_can_wakeup(&hcd->self.root_hub->dev)) {
1789 sl811->port1 = 0;
1790 port_power(sl811, 1);
1791 usb_root_hub_lost_power(hcd->self.root_hub);
1792 return 0;
1793 }
1794
1795 return sl811h_bus_resume(hcd);
1796 }
1797
1798 #else
1799
1800 #define sl811h_suspend NULL
1801 #define sl811h_resume NULL
1802
1803 #endif
1804
1805
1806 /* this driver is exported so sl811_cs can depend on it */
1807 struct platform_driver sl811h_driver = {
1808 .probe = sl811h_probe,
1809 .remove = __devexit_p(sl811h_remove),
1810
1811 .suspend = sl811h_suspend,
1812 .resume = sl811h_resume,
1813 .driver = {
1814 .name = (char *) hcd_name,
1815 .owner = THIS_MODULE,
1816 },
1817 };
1818 EXPORT_SYMBOL(sl811h_driver);
1819
1820 /*-------------------------------------------------------------------------*/
1821
1822 static int __init sl811h_init(void)
1823 {
1824 if (usb_disabled())
1825 return -ENODEV;
1826
1827 INFO("driver %s, %s\n", hcd_name, DRIVER_VERSION);
1828 return platform_driver_register(&sl811h_driver);
1829 }
1830 module_init(sl811h_init);
1831
1832 static void __exit sl811h_cleanup(void)
1833 {
1834 platform_driver_unregister(&sl811h_driver);
1835 }
1836 module_exit(sl811h_cleanup);
kernel-based virtual machine