1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * SL811HS HCD (Host Controller Driver) for USB.
4 *
5 * Copyright (C) 2004 Psion Teklogix (for NetBook PRO)
6 * Copyright (C) 2004-2005 David Brownell
7 *
8 * Periodic scheduling is based on Roman's OHCI code
9 * Copyright (C) 1999 Roman Weissgaerber
10 *
11 * The SL811HS controller handles host side USB (like the SL11H, but with
12 * another register set and SOF generation) as well as peripheral side USB
13 * (like the SL811S). This driver version doesn't implement the Gadget API
14 * for the peripheral role; or OTG (that'd need much external circuitry).
15 *
16 * For documentation, see the SL811HS spec and the "SL811HS Embedded Host"
17 * document (providing significant pieces missing from that spec); plus
18 * the SL811S spec if you want peripheral side info.
19 */
20
21 /*
22 * Status: Passed basic stress testing, works with hubs, mice, keyboards,
23 * and usb-storage.
24 *
25 * TODO:
26 * - usb suspend/resume triggered by sl811
27 * - various issues noted in the code
28 * - performance work; use both register banks; ...
29 * - use urb->iso_frame_desc[] with ISO transfers
30 */
31
32 #undef VERBOSE
33 #undef PACKET_TRACE
34
35 #include <linux/module.h>
36 #include <linux/moduleparam.h>
37 #include <linux/kernel.h>
38 #include <linux/delay.h>
39 #include <linux/ioport.h>
40 #include <linux/sched.h>
41 #include <linux/slab.h>
42 #include <linux/errno.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 #include <linux/debugfs.h>
52 #include <linux/seq_file.h>
53
54 #include <asm/io.h>
55 #include <asm/irq.h>
56 #include <asm/byteorder.h>
57 #include <linux/unaligned.h>
58
59 #include "sl811.h"
60
61
62 MODULE_DESCRIPTION("SL811HS USB Host Controller Driver");
63 MODULE_LICENSE("GPL");
64 MODULE_ALIAS("platform:sl811-hcd");
65
66 #define DRIVER_VERSION "19 May 2005"
67
68 /* for now, use only one transfer register bank */
69 #undef USE_B
70
71 // #define QUIRK2
72 #define QUIRK3
73
74 static const char hcd_name[] = "sl811-hcd";
75
76 /*-------------------------------------------------------------------------*/
77
port_power(struct sl811 * sl811,int is_on)78 static void port_power(struct sl811 *sl811, int is_on)
79 {
80 struct usb_hcd *hcd = sl811_to_hcd(sl811);
81
82 /* hub is inactive unless the port is powered */
83 if (is_on) {
84 if (sl811->port1 & USB_PORT_STAT_POWER)
85 return;
86
87 sl811->port1 = USB_PORT_STAT_POWER;
88 sl811->irq_enable = SL11H_INTMASK_INSRMV;
89 } else {
90 sl811->port1 = 0;
91 sl811->irq_enable = 0;
92 hcd->state = HC_STATE_HALT;
93 }
94 sl811->ctrl1 = 0;
95 sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
96 sl811_write(sl811, SL11H_IRQ_STATUS, ~0);
97
98 if (sl811->board && sl811->board->port_power) {
99 /* switch VBUS, at 500mA unless hub power budget gets set */
100 dev_dbg(hcd->self.controller, "power %s\n",
101 is_on ? "on" : "off");
102 sl811->board->port_power(hcd->self.controller, is_on);
103 }
104
105 /* reset as thoroughly as we can */
106 if (sl811->board && sl811->board->reset)
107 sl811->board->reset(hcd->self.controller);
108 else {
109 sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0);
110 mdelay(20);
111 }
112
113 sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
114 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
115 sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT);
116 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
117
118 // if !is_on, put into lowpower mode now
119 }
120
121 /*-------------------------------------------------------------------------*/
122
123 /* This is a PIO-only HCD. Queueing appends URBs to the endpoint's queue,
124 * and may start I/O. Endpoint queues are scanned during completion irq
125 * handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation.
126 *
127 * Using an external DMA engine to copy a packet at a time could work,
128 * though setup/teardown costs may be too big to make it worthwhile.
129 */
130
131 /* SETUP starts a new control request. Devices are not allowed to
132 * STALL or NAK these; they must cancel any pending control requests.
133 */
setup_packet(struct sl811 * sl811,struct sl811h_ep * ep,struct urb * urb,u8 bank,u8 control)134 static void setup_packet(
135 struct sl811 *sl811,
136 struct sl811h_ep *ep,
137 struct urb *urb,
138 u8 bank,
139 u8 control
140 )
141 {
142 u8 addr;
143 u8 len;
144 void __iomem *data_reg;
145
146 addr = SL811HS_PACKET_BUF(bank == 0);
147 len = sizeof(struct usb_ctrlrequest);
148 data_reg = sl811->data_reg;
149 sl811_write_buf(sl811, addr, urb->setup_packet, len);
150
151 /* autoincrementing */
152 sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
153 writeb(len, data_reg);
154 writeb(SL_SETUP /* | ep->epnum */, data_reg);
155 writeb(usb_pipedevice(urb->pipe), data_reg);
156
157 /* always OUT/data0 */
158 sl811_write(sl811, bank + SL11H_HOSTCTLREG,
159 control | SL11H_HCTLMASK_OUT);
160 ep->length = 0;
161 PACKET("SETUP qh%p\n", ep);
162 }
163
164 /* STATUS finishes control requests, often after IN or OUT data packets */
status_packet(struct sl811 * sl811,struct sl811h_ep * ep,struct urb * urb,u8 bank,u8 control)165 static void status_packet(
166 struct sl811 *sl811,
167 struct sl811h_ep *ep,
168 struct urb *urb,
169 u8 bank,
170 u8 control
171 )
172 {
173 int do_out;
174 void __iomem *data_reg;
175
176 do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe);
177 data_reg = sl811->data_reg;
178
179 /* autoincrementing */
180 sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
181 writeb(0, data_reg);
182 writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg);
183 writeb(usb_pipedevice(urb->pipe), data_reg);
184
185 /* always data1; sometimes IN */
186 control |= SL11H_HCTLMASK_TOGGLE;
187 if (do_out)
188 control |= SL11H_HCTLMASK_OUT;
189 sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
190 ep->length = 0;
191 PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "",
192 do_out ? "out" : "in", ep);
193 }
194
195 /* IN packets can be used with any type of endpoint. here we just
196 * start the transfer, data from the peripheral may arrive later.
197 * urb->iso_frame_desc is currently ignored here...
198 */
in_packet(struct sl811 * sl811,struct sl811h_ep * ep,struct urb * urb,u8 bank,u8 control)199 static void in_packet(
200 struct sl811 *sl811,
201 struct sl811h_ep *ep,
202 struct urb *urb,
203 u8 bank,
204 u8 control
205 )
206 {
207 u8 addr;
208 u8 len;
209 void __iomem *data_reg;
210
211 /* avoid losing data on overflow */
212 len = ep->maxpacket;
213 addr = SL811HS_PACKET_BUF(bank == 0);
214 if (!(control & SL11H_HCTLMASK_ISOCH)
215 && usb_gettoggle(urb->dev, ep->epnum, 0))
216 control |= SL11H_HCTLMASK_TOGGLE;
217 data_reg = sl811->data_reg;
218
219 /* autoincrementing */
220 sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
221 writeb(len, data_reg);
222 writeb(SL_IN | ep->epnum, data_reg);
223 writeb(usb_pipedevice(urb->pipe), data_reg);
224
225 sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
226 ep->length = min_t(u32, len,
227 urb->transfer_buffer_length - urb->actual_length);
228 PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
229 !!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
230 }
231
232 /* OUT packets can be used with any type of endpoint.
233 * urb->iso_frame_desc is currently ignored here...
234 */
out_packet(struct sl811 * sl811,struct sl811h_ep * ep,struct urb * urb,u8 bank,u8 control)235 static void out_packet(
236 struct sl811 *sl811,
237 struct sl811h_ep *ep,
238 struct urb *urb,
239 u8 bank,
240 u8 control
241 )
242 {
243 void *buf;
244 u8 addr;
245 u8 len;
246 void __iomem *data_reg;
247
248 buf = urb->transfer_buffer + urb->actual_length;
249 prefetch(buf);
250
251 len = min_t(u32, ep->maxpacket,
252 urb->transfer_buffer_length - urb->actual_length);
253
254 if (!(control & SL11H_HCTLMASK_ISOCH)
255 && usb_gettoggle(urb->dev, ep->epnum, 1))
256 control |= SL11H_HCTLMASK_TOGGLE;
257 addr = SL811HS_PACKET_BUF(bank == 0);
258 data_reg = sl811->data_reg;
259
260 sl811_write_buf(sl811, addr, buf, len);
261
262 /* autoincrementing */
263 sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
264 writeb(len, data_reg);
265 writeb(SL_OUT | ep->epnum, data_reg);
266 writeb(usb_pipedevice(urb->pipe), data_reg);
267
268 sl811_write(sl811, bank + SL11H_HOSTCTLREG,
269 control | SL11H_HCTLMASK_OUT);
270 ep->length = len;
271 PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
272 !!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len);
273 }
274
275 /*-------------------------------------------------------------------------*/
276
277 /* caller updates on-chip enables later */
278
sofirq_on(struct sl811 * sl811)279 static inline void sofirq_on(struct sl811 *sl811)
280 {
281 if (sl811->irq_enable & SL11H_INTMASK_SOFINTR)
282 return;
283 dev_dbg(sl811_to_hcd(sl811)->self.controller, "sof irq on\n");
284 sl811->irq_enable |= SL11H_INTMASK_SOFINTR;
285 }
286
sofirq_off(struct sl811 * sl811)287 static inline void sofirq_off(struct sl811 *sl811)
288 {
289 if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR))
290 return;
291 dev_dbg(sl811_to_hcd(sl811)->self.controller, "sof irq off\n");
292 sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR;
293 }
294
295 /*-------------------------------------------------------------------------*/
296
297 /* pick the next endpoint for a transaction, and issue it.
298 * frames start with periodic transfers (after whatever is pending
299 * from the previous frame), and the rest of the time is async
300 * transfers, scheduled round-robin.
301 */
start(struct sl811 * sl811,u8 bank)302 static struct sl811h_ep *start(struct sl811 *sl811, u8 bank)
303 {
304 struct sl811h_ep *ep;
305 struct urb *urb;
306 int fclock;
307 u8 control;
308
309 /* use endpoint at schedule head */
310 if (sl811->next_periodic) {
311 ep = sl811->next_periodic;
312 sl811->next_periodic = ep->next;
313 } else {
314 if (sl811->next_async)
315 ep = sl811->next_async;
316 else if (!list_empty(&sl811->async))
317 ep = container_of(sl811->async.next,
318 struct sl811h_ep, schedule);
319 else {
320 /* could set up the first fullspeed periodic
321 * transfer for the next frame ...
322 */
323 return NULL;
324 }
325
326 #ifdef USE_B
327 if ((bank && sl811->active_b == ep) || sl811->active_a == ep)
328 return NULL;
329 #endif
330
331 if (ep->schedule.next == &sl811->async)
332 sl811->next_async = NULL;
333 else
334 sl811->next_async = container_of(ep->schedule.next,
335 struct sl811h_ep, schedule);
336 }
337
338 if (unlikely(list_empty(&ep->hep->urb_list))) {
339 dev_dbg(sl811_to_hcd(sl811)->self.controller,
340 "empty %p queue?\n", ep);
341 return NULL;
342 }
343
344 urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
345 control = ep->defctrl;
346
347 /* if this frame doesn't have enough time left to transfer this
348 * packet, wait till the next frame. too-simple algorithm...
349 */
350 fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6;
351 fclock -= 100; /* setup takes not much time */
352 if (urb->dev->speed == USB_SPEED_LOW) {
353 if (control & SL11H_HCTLMASK_PREAMBLE) {
354 /* also note erratum 1: some hubs won't work */
355 fclock -= 800;
356 }
357 fclock -= ep->maxpacket << 8;
358
359 /* erratum 2: AFTERSOF only works for fullspeed */
360 if (fclock < 0) {
361 if (ep->period)
362 sl811->stat_overrun++;
363 sofirq_on(sl811);
364 return NULL;
365 }
366 } else {
367 fclock -= 12000 / 19; /* 19 64byte packets/msec */
368 if (fclock < 0) {
369 if (ep->period)
370 sl811->stat_overrun++;
371 control |= SL11H_HCTLMASK_AFTERSOF;
372
373 /* throttle bulk/control irq noise */
374 } else if (ep->nak_count)
375 control |= SL11H_HCTLMASK_AFTERSOF;
376 }
377
378
379 switch (ep->nextpid) {
380 case USB_PID_IN:
381 in_packet(sl811, ep, urb, bank, control);
382 break;
383 case USB_PID_OUT:
384 out_packet(sl811, ep, urb, bank, control);
385 break;
386 case USB_PID_SETUP:
387 setup_packet(sl811, ep, urb, bank, control);
388 break;
389 case USB_PID_ACK: /* for control status */
390 status_packet(sl811, ep, urb, bank, control);
391 break;
392 default:
393 dev_dbg(sl811_to_hcd(sl811)->self.controller,
394 "bad ep%p pid %02x\n", ep, ep->nextpid);
395 ep = NULL;
396 }
397 return ep;
398 }
399
400 #define MIN_JIFFIES ((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2)
401
start_transfer(struct sl811 * sl811)402 static inline void start_transfer(struct sl811 *sl811)
403 {
404 if (sl811->port1 & USB_PORT_STAT_SUSPEND)
405 return;
406 if (sl811->active_a == NULL) {
407 sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
408 if (sl811->active_a != NULL)
409 sl811->jiffies_a = jiffies + MIN_JIFFIES;
410 }
411 #ifdef USE_B
412 if (sl811->active_b == NULL) {
413 sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
414 if (sl811->active_b != NULL)
415 sl811->jiffies_b = jiffies + MIN_JIFFIES;
416 }
417 #endif
418 }
419
finish_request(struct sl811 * sl811,struct sl811h_ep * ep,struct urb * urb,int status)420 static void finish_request(
421 struct sl811 *sl811,
422 struct sl811h_ep *ep,
423 struct urb *urb,
424 int status
425 ) __releases(sl811->lock) __acquires(sl811->lock)
426 {
427 unsigned i;
428
429 if (usb_pipecontrol(urb->pipe))
430 ep->nextpid = USB_PID_SETUP;
431
432 usb_hcd_unlink_urb_from_ep(sl811_to_hcd(sl811), urb);
433 spin_unlock(&sl811->lock);
434 usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, status);
435 spin_lock(&sl811->lock);
436
437 /* leave active endpoints in the schedule */
438 if (!list_empty(&ep->hep->urb_list))
439 return;
440
441 /* async deschedule? */
442 if (!list_empty(&ep->schedule)) {
443 list_del_init(&ep->schedule);
444 if (ep == sl811->next_async)
445 sl811->next_async = NULL;
446 return;
447 }
448
449 /* periodic deschedule */
450 dev_dbg(sl811_to_hcd(sl811)->self.controller,
451 "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
done(struct sl811 * sl811,struct sl811h_ep * ep,u8 bank)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 #ifdef QUIRK2
checkdone(struct sl811 * sl811)589 static inline u8 checkdone(struct sl811 *sl811)
590 {
591 u8 ctl;
592 u8 irqstat = 0;
593
594 if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) {
595 ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG));
596 if (ctl & SL11H_HCTLMASK_ARM)
597 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
598 dev_dbg(sl811_to_hcd(sl811)->self.controller,
599 "%s DONE_A: ctrl %02x sts %02x\n",
600 (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
601 ctl,
602 sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
603 irqstat |= SL11H_INTMASK_DONE_A;
604 }
605 #ifdef USE_B
606 if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) {
607 ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG));
608 if (ctl & SL11H_HCTLMASK_ARM)
609 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
610 dev_dbg(sl811_to_hcd(sl811)->self.controller,
611 "%s DONE_B: ctrl %02x sts %02x\n",
612 (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
613 ctl,
614 sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
615 irqstat |= SL11H_INTMASK_DONE_A;
616 }
617 #endif
618 return irqstat;
619 }
620 #endif
621
sl811h_irq(struct usb_hcd * hcd)622 static irqreturn_t sl811h_irq(struct usb_hcd *hcd)
623 {
624 struct sl811 *sl811 = hcd_to_sl811(hcd);
625 u8 irqstat;
626 irqreturn_t ret = IRQ_NONE;
627 unsigned retries = 5;
628
629 spin_lock(&sl811->lock);
630
631 retry:
632 irqstat = sl811_read(sl811, SL11H_IRQ_STATUS) & ~SL11H_INTMASK_DP;
633 if (irqstat) {
634 sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
635 irqstat &= sl811->irq_enable;
636 }
637
638 #ifdef QUIRK2
639 /* this may no longer be necessary ... */
640 if (irqstat == 0) {
641 irqstat = checkdone(sl811);
642 if (irqstat)
643 sl811->stat_lost++;
644 }
645 #endif
646
647 /* USB packets, not necessarily handled in the order they're
648 * issued ... that's fine if they're different endpoints.
649 */
650 if (irqstat & SL11H_INTMASK_DONE_A) {
651 done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF));
652 sl811->active_a = NULL;
653 sl811->stat_a++;
654 }
655 #ifdef USE_B
656 if (irqstat & SL11H_INTMASK_DONE_B) {
657 done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF));
658 sl811->active_b = NULL;
659 sl811->stat_b++;
660 }
661 #endif
662 if (irqstat & SL11H_INTMASK_SOFINTR) {
663 unsigned index;
664
665 index = sl811->frame++ % (PERIODIC_SIZE - 1);
666 sl811->stat_sof++;
667
668 /* be graceful about almost-inevitable periodic schedule
669 * overruns: continue the previous frame's transfers iff
670 * this one has nothing scheduled.
671 */
672 if (sl811->next_periodic) {
673 // dev_err(hcd->self.controller, "overrun to slot %d\n", index);
674 sl811->stat_overrun++;
675 }
676 if (sl811->periodic[index])
677 sl811->next_periodic = sl811->periodic[index];
678 }
679
680 /* hub_wq manages debouncing and wakeup */
681 if (irqstat & SL11H_INTMASK_INSRMV) {
682 sl811->stat_insrmv++;
683
684 /* most stats are reset for each VBUS session */
685 sl811->stat_wake = 0;
686 sl811->stat_sof = 0;
687 sl811->stat_a = 0;
688 sl811->stat_b = 0;
689 sl811->stat_lost = 0;
690
691 sl811->ctrl1 = 0;
692 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
693
694 sl811->irq_enable = SL11H_INTMASK_INSRMV;
695 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
696
697 /* usbcore nukes other pending transactions on disconnect */
698 if (sl811->active_a) {
699 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
700 finish_request(sl811, sl811->active_a,
701 container_of(sl811->active_a
702 ->hep->urb_list.next,
703 struct urb, urb_list),
704 -ESHUTDOWN);
705 sl811->active_a = NULL;
706 }
707 #ifdef USE_B
708 if (sl811->active_b) {
709 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
710 finish_request(sl811, sl811->active_b,
711 container_of(sl811->active_b
712 ->hep->urb_list.next,
713 struct urb, urb_list),
714 NULL, -ESHUTDOWN);
715 sl811->active_b = NULL;
716 }
717 #endif
718
719 /* port status seems weird until after reset, so
720 * force the reset and make hub_wq clean up later.
721 */
722 if (irqstat & SL11H_INTMASK_RD)
723 sl811->port1 &= ~USB_PORT_STAT_CONNECTION;
724 else
725 sl811->port1 |= USB_PORT_STAT_CONNECTION;
726
727 sl811->port1 |= USB_PORT_STAT_C_CONNECTION << 16;
728
729 } else if (irqstat & SL11H_INTMASK_RD) {
730 if (sl811->port1 & USB_PORT_STAT_SUSPEND) {
731 dev_dbg(hcd->self.controller, "wakeup\n");
732 sl811->port1 |= USB_PORT_STAT_C_SUSPEND << 16;
733 sl811->stat_wake++;
734 } else
735 irqstat &= ~SL11H_INTMASK_RD;
736 }
737
738 if (irqstat) {
739 if (sl811->port1 & USB_PORT_STAT_ENABLE)
740 start_transfer(sl811);
741 ret = IRQ_HANDLED;
742 if (retries--)
743 goto retry;
744 }
745
746 if (sl811->periodic_count == 0 && list_empty(&sl811->async))
747 sofirq_off(sl811);
748 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
749
750 spin_unlock(&sl811->lock);
751
752 return ret;
753 }
754
755 /*-------------------------------------------------------------------------*/
756
757 /* usb 1.1 says max 90% of a frame is available for periodic transfers.
758 * this driver doesn't promise that much since it's got to handle an
759 * IRQ per packet; irq handling latencies also use up that time.
760 *
761 * NOTE: the periodic schedule is a sparse tree, with the load for
762 * each branch minimized. see fig 3.5 in the OHCI spec for example.
763 */
764 #define MAX_PERIODIC_LOAD 500 /* out of 1000 usec */
765
balance(struct sl811 * sl811,u16 period,u16 load)766 static int balance(struct sl811 *sl811, u16 period, u16 load)
767 {
768 int i, branch = -ENOSPC;
769
770 /* search for the least loaded schedule branch of that period
771 * which has enough bandwidth left unreserved.
772 */
773 for (i = 0; i < period ; i++) {
774 if (branch < 0 || sl811->load[branch] > sl811->load[i]) {
775 int j;
776
777 for (j = i; j < PERIODIC_SIZE; j += period) {
778 if ((sl811->load[j] + load)
779 > MAX_PERIODIC_LOAD)
780 break;
781 }
782 if (j < PERIODIC_SIZE)
783 continue;
784 branch = i;
785 }
786 }
787 return branch;
788 }
789
790 /*-------------------------------------------------------------------------*/
791
sl811h_urb_enqueue(struct usb_hcd * hcd,struct urb * urb,gfp_t mem_flags)792 static int sl811h_urb_enqueue(
793 struct usb_hcd *hcd,
794 struct urb *urb,
795 gfp_t mem_flags
796 ) {
797 struct sl811 *sl811 = hcd_to_sl811(hcd);
798 struct usb_device *udev = urb->dev;
799 unsigned int pipe = urb->pipe;
800 int is_out = !usb_pipein(pipe);
801 int type = usb_pipetype(pipe);
802 int epnum = usb_pipeendpoint(pipe);
803 struct sl811h_ep *ep = NULL;
804 unsigned long flags;
805 int i;
806 int retval;
807 struct usb_host_endpoint *hep = urb->ep;
808
809 #ifndef CONFIG_USB_SL811_HCD_ISO
810 if (type == PIPE_ISOCHRONOUS)
811 return -ENOSPC;
812 #endif
813
814 /* avoid all allocations within spinlocks */
815 if (!hep->hcpriv) {
816 ep = kzalloc(sizeof *ep, mem_flags);
817 if (ep == NULL)
818 return -ENOMEM;
819 }
820
821 spin_lock_irqsave(&sl811->lock, flags);
822
823 /* don't submit to a dead or disabled port */
824 if (!(sl811->port1 & USB_PORT_STAT_ENABLE)
825 || !HC_IS_RUNNING(hcd->state)) {
826 retval = -ENODEV;
827 kfree(ep);
828 goto fail_not_linked;
829 }
830 retval = usb_hcd_link_urb_to_ep(hcd, urb);
831 if (retval) {
832 kfree(ep);
833 goto fail_not_linked;
834 }
835
836 if (hep->hcpriv) {
837 kfree(ep);
838 ep = hep->hcpriv;
839 } else if (!ep) {
840 retval = -ENOMEM;
841 goto fail;
842
843 } else {
844 INIT_LIST_HEAD(&ep->schedule);
845 ep->udev = udev;
846 ep->epnum = epnum;
847 ep->maxpacket = usb_maxpacket(udev, urb->pipe);
848 ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE;
849 usb_settoggle(udev, epnum, is_out, 0);
850
851 if (type == PIPE_CONTROL)
852 ep->nextpid = USB_PID_SETUP;
853 else if (is_out)
854 ep->nextpid = USB_PID_OUT;
855 else
856 ep->nextpid = USB_PID_IN;
857
858 if (ep->maxpacket > H_MAXPACKET) {
859 /* iso packets up to 240 bytes could work... */
860 dev_dbg(hcd->self.controller,
861 "dev %d ep%d maxpacket %d\n", udev->devnum,
862 epnum, ep->maxpacket);
863 retval = -EINVAL;
864 kfree(ep);
865 goto fail;
866 }
867
868 if (udev->speed == USB_SPEED_LOW) {
869 /* send preamble for external hub? */
870 if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD))
871 ep->defctrl |= SL11H_HCTLMASK_PREAMBLE;
872 }
873 switch (type) {
874 case PIPE_ISOCHRONOUS:
875 case PIPE_INTERRUPT:
876 if (urb->interval > PERIODIC_SIZE)
877 urb->interval = PERIODIC_SIZE;
878 ep->period = urb->interval;
879 ep->branch = PERIODIC_SIZE;
880 if (type == PIPE_ISOCHRONOUS)
881 ep->defctrl |= SL11H_HCTLMASK_ISOCH;
882 ep->load = usb_calc_bus_time(udev->speed, !is_out,
883 type == PIPE_ISOCHRONOUS,
884 usb_maxpacket(udev, pipe))
885 / 1000;
886 break;
887 }
888
889 ep->hep = hep;
890 hep->hcpriv = ep;
891 }
892
893 /* maybe put endpoint into schedule */
894 switch (type) {
895 case PIPE_CONTROL:
896 case PIPE_BULK:
897 if (list_empty(&ep->schedule))
898 list_add_tail(&ep->schedule, &sl811->async);
899 break;
900 case PIPE_ISOCHRONOUS:
901 case PIPE_INTERRUPT:
902 urb->interval = ep->period;
903 if (ep->branch < PERIODIC_SIZE) {
904 /* NOTE: the phase is correct here, but the value
905 * needs offsetting by the transfer queue depth.
906 * All current drivers ignore start_frame, so this
907 * is unlikely to ever matter...
908 */
909 urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
910 + ep->branch;
911 break;
912 }
913
914 retval = balance(sl811, ep->period, ep->load);
915 if (retval < 0)
916 goto fail;
917 ep->branch = retval;
918 retval = 0;
919 urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
920 + ep->branch;
921
922 /* sort each schedule branch by period (slow before fast)
923 * to share the faster parts of the tree without needing
924 * dummy/placeholder nodes
925 */
926 dev_dbg(hcd->self.controller, "schedule qh%d/%p branch %d\n",
927 ep->period, ep, ep->branch);
928 for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
929 struct sl811h_ep **prev = &sl811->periodic[i];
930 struct sl811h_ep *here = *prev;
931
932 while (here && ep != here) {
933 if (ep->period > here->period)
934 break;
935 prev = &here->next;
936 here = *prev;
937 }
938 if (ep != here) {
939 ep->next = here;
940 *prev = ep;
941 }
942 sl811->load[i] += ep->load;
943 }
944 sl811->periodic_count++;
945 hcd->self.bandwidth_allocated += ep->load / ep->period;
946 sofirq_on(sl811);
947 }
948
949 urb->hcpriv = hep;
950 start_transfer(sl811);
951 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
952 fail:
953 if (retval)
954 usb_hcd_unlink_urb_from_ep(hcd, urb);
955 fail_not_linked:
956 spin_unlock_irqrestore(&sl811->lock, flags);
957 return retval;
958 }
959
sl811h_urb_dequeue(struct usb_hcd * hcd,struct urb * urb,int status)960 static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
961 {
962 struct sl811 *sl811 = hcd_to_sl811(hcd);
963 struct usb_host_endpoint *hep;
964 unsigned long flags;
965 struct sl811h_ep *ep;
966 int retval;
967
968 spin_lock_irqsave(&sl811->lock, flags);
969 retval = usb_hcd_check_unlink_urb(hcd, urb, status);
970 if (retval)
971 goto fail;
972
973 hep = urb->hcpriv;
974 ep = hep->hcpriv;
975 if (ep) {
976 /* finish right away if this urb can't be active ...
977 * note that some drivers wrongly expect delays
978 */
979 if (ep->hep->urb_list.next != &urb->urb_list) {
980 /* not front of queue? never active */
981
982 /* for active transfers, we expect an IRQ */
983 } else if (sl811->active_a == ep) {
984 if (time_before_eq(sl811->jiffies_a, jiffies)) {
985 /* happens a lot with lowspeed?? */
986 dev_dbg(hcd->self.controller,
987 "giveup on DONE_A: ctrl %02x sts %02x\n",
988 sl811_read(sl811,
989 SL811_EP_A(SL11H_HOSTCTLREG)),
990 sl811_read(sl811,
991 SL811_EP_A(SL11H_PKTSTATREG)));
992 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
993 0);
994 sl811->active_a = NULL;
995 } else
996 urb = NULL;
997 #ifdef USE_B
998 } else if (sl811->active_b == ep) {
999 if (time_before_eq(sl811->jiffies_a, jiffies)) {
1000 /* happens a lot with lowspeed?? */
1001 dev_dbg(hcd->self.controller,
1002 "giveup on DONE_B: ctrl %02x sts %02x\n",
1003 sl811_read(sl811,
1004 SL811_EP_B(SL11H_HOSTCTLREG)),
1005 sl811_read(sl811,
1006 SL811_EP_B(SL11H_PKTSTATREG)));
1007 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG),
1008 0);
1009 sl811->active_b = NULL;
1010 } else
1011 urb = NULL;
1012 #endif
1013 } else {
1014 /* front of queue for inactive endpoint */
1015 }
1016
1017 if (urb)
1018 finish_request(sl811, ep, urb, 0);
1019 else
1020 dev_dbg(sl811_to_hcd(sl811)->self.controller,
1021 "dequeue, urb %p active %s; wait4irq\n", urb,
1022 (sl811->active_a == ep) ? "A" : "B");
1023 } else
1024 retval = -EINVAL;
1025 fail:
1026 spin_unlock_irqrestore(&sl811->lock, flags);
1027 return retval;
1028 }
1029
1030 static void
sl811h_endpoint_disable(struct usb_hcd * hcd,struct usb_host_endpoint * hep)1031 sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
1032 {
1033 struct sl811h_ep *ep = hep->hcpriv;
1034
1035 if (!ep)
1036 return;
1037
1038 /* assume we'd just wait for the irq */
1039 if (!list_empty(&hep->urb_list))
1040 msleep(3);
1041 if (!list_empty(&hep->urb_list))
1042 dev_warn(hcd->self.controller, "ep %p not empty?\n", ep);
1043
1044 kfree(ep);
1045 hep->hcpriv = NULL;
1046 }
1047
1048 static int
sl811h_get_frame(struct usb_hcd * hcd)1049 sl811h_get_frame(struct usb_hcd *hcd)
1050 {
1051 struct sl811 *sl811 = hcd_to_sl811(hcd);
1052
1053 /* wrong except while periodic transfers are scheduled;
1054 * never matches the on-the-wire frame;
1055 * subject to overruns.
1056 */
1057 return sl811->frame;
1058 }
1059
1060
1061 /*-------------------------------------------------------------------------*/
1062
1063 /* the virtual root hub timer IRQ checks for hub status */
1064 static int
sl811h_hub_status_data(struct usb_hcd * hcd,char * buf)1065 sl811h_hub_status_data(struct usb_hcd *hcd, char *buf)
1066 {
1067 struct sl811 *sl811 = hcd_to_sl811(hcd);
1068 #ifdef QUIRK3
1069 unsigned long flags;
1070
1071 /* non-SMP HACK: use root hub timer as i/o watchdog
1072 * this seems essential when SOF IRQs aren't in use...
1073 */
1074 local_irq_save(flags);
1075 if (!timer_pending(&sl811->timer)) {
1076 if (sl811h_irq( /* ~0, */ hcd) != IRQ_NONE)
1077 sl811->stat_lost++;
1078 }
1079 local_irq_restore(flags);
1080 #endif
1081
1082 if (!(sl811->port1 & (0xffff << 16)))
1083 return 0;
1084
1085 /* tell hub_wq port 1 changed */
1086 *buf = (1 << 1);
1087 return 1;
1088 }
1089
1090 static void
sl811h_hub_descriptor(struct sl811 * sl811,struct usb_hub_descriptor * desc)1091 sl811h_hub_descriptor (
1092 struct sl811 *sl811,
1093 struct usb_hub_descriptor *desc
1094 ) {
1095 u16 temp = 0;
1096
1097 desc->bDescriptorType = USB_DT_HUB;
1098 desc->bHubContrCurrent = 0;
1099
1100 desc->bNbrPorts = 1;
1101 desc->bDescLength = 9;
1102
1103 /* per-port power switching (gang of one!), or none */
1104 desc->bPwrOn2PwrGood = 0;
1105 if (sl811->board && sl811->board->port_power) {
1106 desc->bPwrOn2PwrGood = sl811->board->potpg;
1107 if (!desc->bPwrOn2PwrGood)
1108 desc->bPwrOn2PwrGood = 10;
1109 temp = HUB_CHAR_INDV_PORT_LPSM;
1110 } else
1111 temp = HUB_CHAR_NO_LPSM;
1112
1113 /* no overcurrent errors detection/handling */
1114 temp |= HUB_CHAR_NO_OCPM;
1115
1116 desc->wHubCharacteristics = cpu_to_le16(temp);
1117
1118 /* ports removable, and legacy PortPwrCtrlMask */
1119 desc->u.hs.DeviceRemovable[0] = 0 << 1;
1120 desc->u.hs.DeviceRemovable[1] = ~0;
1121 }
1122
1123 static void
sl811h_timer(struct timer_list * t)1124 sl811h_timer(struct timer_list *t)
1125 {
1126 struct sl811 *sl811 = from_timer(sl811, t, timer);
1127 unsigned long flags;
1128 u8 irqstat;
1129 u8 signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE;
1130 const u32 mask = USB_PORT_STAT_CONNECTION
1131 | USB_PORT_STAT_ENABLE
1132 | USB_PORT_STAT_LOW_SPEED;
1133
1134 spin_lock_irqsave(&sl811->lock, flags);
1135
1136 /* stop special signaling */
1137 sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE;
1138 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1139 udelay(3);
1140
1141 irqstat = sl811_read(sl811, SL11H_IRQ_STATUS);
1142
1143 switch (signaling) {
1144 case SL11H_CTL1MASK_SE0:
1145 dev_dbg(sl811_to_hcd(sl811)->self.controller, "end reset\n");
1146 sl811->port1 = (USB_PORT_STAT_C_RESET << 16)
1147 | USB_PORT_STAT_POWER;
1148 sl811->ctrl1 = 0;
1149 /* don't wrongly ack RD */
1150 if (irqstat & SL11H_INTMASK_INSRMV)
1151 irqstat &= ~SL11H_INTMASK_RD;
1152 break;
1153 case SL11H_CTL1MASK_K:
1154 dev_dbg(sl811_to_hcd(sl811)->self.controller, "end resume\n");
1155 sl811->port1 &= ~USB_PORT_STAT_SUSPEND;
1156 break;
1157 default:
1158 dev_dbg(sl811_to_hcd(sl811)->self.controller,
1159 "odd timer signaling: %02x\n", signaling);
1160 break;
1161 }
1162 sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
1163
1164 if (irqstat & SL11H_INTMASK_RD) {
1165 /* usbcore nukes all pending transactions on disconnect */
1166 if (sl811->port1 & USB_PORT_STAT_CONNECTION)
1167 sl811->port1 |= (USB_PORT_STAT_C_CONNECTION << 16)
1168 | (USB_PORT_STAT_C_ENABLE << 16);
1169 sl811->port1 &= ~mask;
1170 sl811->irq_enable = SL11H_INTMASK_INSRMV;
1171 } else {
1172 sl811->port1 |= mask;
1173 if (irqstat & SL11H_INTMASK_DP)
1174 sl811->port1 &= ~USB_PORT_STAT_LOW_SPEED;
1175 sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD;
1176 }
1177
1178 if (sl811->port1 & USB_PORT_STAT_CONNECTION) {
1179 u8 ctrl2 = SL811HS_CTL2_INIT;
1180
1181 sl811->irq_enable |= SL11H_INTMASK_DONE_A;
1182 #ifdef USE_B
1183 sl811->irq_enable |= SL11H_INTMASK_DONE_B;
1184 #endif
1185 if (sl811->port1 & USB_PORT_STAT_LOW_SPEED) {
1186 sl811->ctrl1 |= SL11H_CTL1MASK_LSPD;
1187 ctrl2 |= SL811HS_CTL2MASK_DSWAP;
1188 }
1189
1190 /* start SOFs flowing, kickstarting with A registers */
1191 sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA;
1192 sl811_write(sl811, SL11H_SOFLOWREG, 0xe0);
1193 sl811_write(sl811, SL811HS_CTLREG2, ctrl2);
1194
1195 /* autoincrementing */
1196 sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0);
1197 writeb(SL_SOF, sl811->data_reg);
1198 writeb(0, sl811->data_reg);
1199 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1200 SL11H_HCTLMASK_ARM);
1201
1202 /* hub_wq provides debounce delay */
1203 } else {
1204 sl811->ctrl1 = 0;
1205 }
1206 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1207
1208 /* reenable irqs */
1209 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
1210 spin_unlock_irqrestore(&sl811->lock, flags);
1211 }
1212
1213 static int
sl811h_hub_control(struct usb_hcd * hcd,u16 typeReq,u16 wValue,u16 wIndex,char * buf,u16 wLength)1214 sl811h_hub_control(
1215 struct usb_hcd *hcd,
1216 u16 typeReq,
1217 u16 wValue,
1218 u16 wIndex,
1219 char *buf,
1220 u16 wLength
1221 ) {
1222 struct sl811 *sl811 = hcd_to_sl811(hcd);
1223 int retval = 0;
1224 unsigned long flags;
1225
1226 spin_lock_irqsave(&sl811->lock, flags);
1227
1228 switch (typeReq) {
1229 case ClearHubFeature:
1230 case SetHubFeature:
1231 switch (wValue) {
1232 case C_HUB_OVER_CURRENT:
1233 case C_HUB_LOCAL_POWER:
1234 break;
1235 default:
1236 goto error;
1237 }
1238 break;
1239 case ClearPortFeature:
1240 if (wIndex != 1 || wLength != 0)
1241 goto error;
1242
1243 switch (wValue) {
1244 case USB_PORT_FEAT_ENABLE:
1245 sl811->port1 &= USB_PORT_STAT_POWER;
1246 sl811->ctrl1 = 0;
1247 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1248 sl811->irq_enable = SL11H_INTMASK_INSRMV;
1249 sl811_write(sl811, SL11H_IRQ_ENABLE,
1250 sl811->irq_enable);
1251 break;
1252 case USB_PORT_FEAT_SUSPEND:
1253 if (!(sl811->port1 & USB_PORT_STAT_SUSPEND))
1254 break;
1255
1256 /* 20 msec of resume/K signaling, other irqs blocked */
1257 dev_dbg(hcd->self.controller, "start resume...\n");
1258 sl811->irq_enable = 0;
1259 sl811_write(sl811, SL11H_IRQ_ENABLE,
1260 sl811->irq_enable);
1261 sl811->ctrl1 |= SL11H_CTL1MASK_K;
1262 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1263
1264 mod_timer(&sl811->timer, jiffies
1265 + msecs_to_jiffies(USB_RESUME_TIMEOUT));
1266 break;
1267 case USB_PORT_FEAT_POWER:
1268 port_power(sl811, 0);
1269 break;
1270 case USB_PORT_FEAT_C_ENABLE:
1271 case USB_PORT_FEAT_C_SUSPEND:
1272 case USB_PORT_FEAT_C_CONNECTION:
1273 case USB_PORT_FEAT_C_OVER_CURRENT:
1274 case USB_PORT_FEAT_C_RESET:
1275 break;
1276 default:
1277 goto error;
1278 }
1279 sl811->port1 &= ~(1 << wValue);
1280 break;
1281 case GetHubDescriptor:
1282 sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf);
1283 break;
1284 case GetHubStatus:
1285 put_unaligned_le32(0, buf);
1286 break;
1287 case GetPortStatus:
1288 if (wIndex != 1)
1289 goto error;
1290 put_unaligned_le32(sl811->port1, buf);
1291
1292 if (__is_defined(VERBOSE) ||
1293 *(u16*)(buf+2)) /* only if wPortChange is interesting */
1294 dev_dbg(hcd->self.controller, "GetPortStatus %08x\n",
1295 sl811->port1);
1296 break;
1297 case SetPortFeature:
1298 if (wIndex != 1 || wLength != 0)
1299 goto error;
1300 switch (wValue) {
1301 case USB_PORT_FEAT_SUSPEND:
1302 if (sl811->port1 & USB_PORT_STAT_RESET)
1303 goto error;
1304 if (!(sl811->port1 & USB_PORT_STAT_ENABLE))
1305 goto error;
1306
1307 dev_dbg(hcd->self.controller,"suspend...\n");
1308 sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA;
1309 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1310 break;
1311 case USB_PORT_FEAT_POWER:
1312 port_power(sl811, 1);
1313 break;
1314 case USB_PORT_FEAT_RESET:
1315 if (sl811->port1 & USB_PORT_STAT_SUSPEND)
1316 goto error;
1317 if (!(sl811->port1 & USB_PORT_STAT_POWER))
1318 break;
1319
1320 /* 50 msec of reset/SE0 signaling, irqs blocked */
1321 sl811->irq_enable = 0;
1322 sl811_write(sl811, SL11H_IRQ_ENABLE,
1323 sl811->irq_enable);
1324 sl811->ctrl1 = SL11H_CTL1MASK_SE0;
1325 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1326 sl811->port1 |= USB_PORT_STAT_RESET;
1327 mod_timer(&sl811->timer, jiffies
1328 + msecs_to_jiffies(50));
1329 break;
1330 default:
1331 goto error;
1332 }
1333 sl811->port1 |= 1 << wValue;
1334 break;
1335
1336 default:
1337 error:
1338 /* "protocol stall" on error */
1339 retval = -EPIPE;
1340 }
1341
1342 spin_unlock_irqrestore(&sl811->lock, flags);
1343 return retval;
1344 }
1345
1346 #ifdef CONFIG_PM
1347
1348 static int
sl811h_bus_suspend(struct usb_hcd * hcd)1349 sl811h_bus_suspend(struct usb_hcd *hcd)
1350 {
1351 // SOFs off
1352 dev_dbg(hcd->self.controller, "%s\n", __func__);
1353 return 0;
1354 }
1355
1356 static int
sl811h_bus_resume(struct usb_hcd * hcd)1357 sl811h_bus_resume(struct usb_hcd *hcd)
1358 {
1359 // SOFs on
1360 dev_dbg(hcd->self.controller, "%s\n", __func__);
1361 return 0;
1362 }
1363
1364 #else
1365
1366 #define sl811h_bus_suspend NULL
1367 #define sl811h_bus_resume NULL
1368
1369 #endif
1370
1371
1372 /*-------------------------------------------------------------------------*/
1373
dump_irq(struct seq_file * s,char * label,u8 mask)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
sl811h_debug_show(struct seq_file * s,void * unused)1385 static int sl811h_debug_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 DEFINE_SHOW_ATTRIBUTE(sl811h_debug);
1496
1497 /* expect just one sl811 per system */
create_debug_file(struct sl811 * sl811)1498 static void create_debug_file(struct sl811 *sl811)
1499 {
1500 debugfs_create_file("sl811h", S_IRUGO, usb_debug_root, sl811,
1501 &sl811h_debug_fops);
1502 }
1503
remove_debug_file(struct sl811 * sl811)1504 static void remove_debug_file(struct sl811 *sl811)
1505 {
1506 debugfs_lookup_and_remove("sl811h", usb_debug_root);
1507 }
1508
1509 /*-------------------------------------------------------------------------*/
1510
1511 static void
sl811h_stop(struct usb_hcd * hcd)1512 sl811h_stop(struct usb_hcd *hcd)
1513 {
1514 struct sl811 *sl811 = hcd_to_sl811(hcd);
1515 unsigned long flags;
1516
1517 del_timer_sync(&hcd->rh_timer);
1518
1519 spin_lock_irqsave(&sl811->lock, flags);
1520 port_power(sl811, 0);
1521 spin_unlock_irqrestore(&sl811->lock, flags);
1522 }
1523
1524 static int
sl811h_start(struct usb_hcd * hcd)1525 sl811h_start(struct usb_hcd *hcd)
1526 {
1527 struct sl811 *sl811 = hcd_to_sl811(hcd);
1528
1529 /* chip has been reset, VBUS power is off */
1530 hcd->state = HC_STATE_RUNNING;
1531
1532 if (sl811->board) {
1533 if (!device_can_wakeup(hcd->self.controller))
1534 device_init_wakeup(hcd->self.controller,
1535 sl811->board->can_wakeup);
1536 hcd->power_budget = sl811->board->power * 2;
1537 }
1538
1539 /* enable power and interrupts */
1540 port_power(sl811, 1);
1541
1542 return 0;
1543 }
1544
1545 /*-------------------------------------------------------------------------*/
1546
1547 static const struct hc_driver sl811h_hc_driver = {
1548 .description = hcd_name,
1549 .hcd_priv_size = sizeof(struct sl811),
1550
1551 /*
1552 * generic hardware linkage
1553 */
1554 .irq = sl811h_irq,
1555 .flags = HCD_USB11 | HCD_MEMORY,
1556
1557 /* Basic lifecycle operations */
1558 .start = sl811h_start,
1559 .stop = sl811h_stop,
1560
1561 /*
1562 * managing i/o requests and associated device resources
1563 */
1564 .urb_enqueue = sl811h_urb_enqueue,
1565 .urb_dequeue = sl811h_urb_dequeue,
1566 .endpoint_disable = sl811h_endpoint_disable,
1567
1568 /*
1569 * periodic schedule support
1570 */
1571 .get_frame_number = sl811h_get_frame,
1572
1573 /*
1574 * root hub support
1575 */
1576 .hub_status_data = sl811h_hub_status_data,
1577 .hub_control = sl811h_hub_control,
1578 .bus_suspend = sl811h_bus_suspend,
1579 .bus_resume = sl811h_bus_resume,
1580 };
1581
1582 /*-------------------------------------------------------------------------*/
1583
1584 static void
sl811h_remove(struct platform_device * dev)1585 sl811h_remove(struct platform_device *dev)
1586 {
1587 struct usb_hcd *hcd = platform_get_drvdata(dev);
1588 struct sl811 *sl811 = hcd_to_sl811(hcd);
1589 struct resource *res;
1590
1591 remove_debug_file(sl811);
1592 usb_remove_hcd(hcd);
1593
1594 /* some platforms may use IORESOURCE_IO */
1595 res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1596 if (res)
1597 iounmap(sl811->data_reg);
1598
1599 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1600 if (res)
1601 iounmap(sl811->addr_reg);
1602
1603 usb_put_hcd(hcd);
1604 }
1605
1606 static int
sl811h_probe(struct platform_device * dev)1607 sl811h_probe(struct platform_device *dev)
1608 {
1609 struct usb_hcd *hcd;
1610 struct sl811 *sl811;
1611 struct resource *addr, *data, *ires;
1612 int irq;
1613 void __iomem *addr_reg;
1614 void __iomem *data_reg;
1615 int retval;
1616 u8 tmp, ioaddr;
1617 unsigned long irqflags;
1618
1619 if (usb_disabled())
1620 return -ENODEV;
1621
1622 /* the chip may be wired for either kind of addressing */
1623 addr = platform_get_mem_or_io(dev, 0);
1624 data = platform_get_mem_or_io(dev, 1);
1625 if (!addr || !data || resource_type(addr) != resource_type(data))
1626 return -ENODEV;
1627
1628 /* basic sanity checks first. board-specific init logic should
1629 * have initialized these three resources and probably board
1630 * specific platform_data. we don't probe for IRQs, and do only
1631 * minimal sanity checking.
1632 */
1633 ires = platform_get_resource(dev, IORESOURCE_IRQ, 0);
1634 if (dev->num_resources < 3 || !ires)
1635 return -ENODEV;
1636
1637 irq = ires->start;
1638 irqflags = ires->flags & IRQF_TRIGGER_MASK;
1639
1640 ioaddr = resource_type(addr) == IORESOURCE_IO;
1641 if (ioaddr) {
1642 /*
1643 * NOTE: 64-bit resource->start is getting truncated
1644 * to avoid compiler warning, assuming that ->start
1645 * is always 32-bit for this case
1646 */
1647 addr_reg = (void __iomem *) (unsigned long) addr->start;
1648 data_reg = (void __iomem *) (unsigned long) data->start;
1649 } else {
1650 addr_reg = ioremap(addr->start, 1);
1651 if (addr_reg == NULL) {
1652 retval = -ENOMEM;
1653 goto err2;
1654 }
1655
1656 data_reg = ioremap(data->start, 1);
1657 if (data_reg == NULL) {
1658 retval = -ENOMEM;
1659 goto err4;
1660 }
1661 }
1662
1663 /* allocate and initialize hcd */
1664 hcd = usb_create_hcd(&sl811h_hc_driver, &dev->dev, dev_name(&dev->dev));
1665 if (!hcd) {
1666 retval = -ENOMEM;
1667 goto err5;
1668 }
1669 hcd->rsrc_start = addr->start;
1670 sl811 = hcd_to_sl811(hcd);
1671
1672 spin_lock_init(&sl811->lock);
1673 INIT_LIST_HEAD(&sl811->async);
1674 sl811->board = dev_get_platdata(&dev->dev);
1675 timer_setup(&sl811->timer, sl811h_timer, 0);
1676 sl811->addr_reg = addr_reg;
1677 sl811->data_reg = data_reg;
1678
1679 spin_lock_irq(&sl811->lock);
1680 port_power(sl811, 0);
1681 spin_unlock_irq(&sl811->lock);
1682 msleep(200);
1683
1684 tmp = sl811_read(sl811, SL11H_HWREVREG);
1685 switch (tmp >> 4) {
1686 case 1:
1687 hcd->product_desc = "SL811HS v1.2";
1688 break;
1689 case 2:
1690 hcd->product_desc = "SL811HS v1.5";
1691 break;
1692 default:
1693 /* reject case 0, SL11S is less functional */
1694 dev_dbg(&dev->dev, "chiprev %02x\n", tmp);
1695 retval = -ENXIO;
1696 goto err6;
1697 }
1698
1699 /* The chip's IRQ is level triggered, active high. A requirement
1700 * for platform device setup is to cope with things like signal
1701 * inverters (e.g. CF is active low) or working only with edge
1702 * triggers (e.g. most ARM CPUs). Initial driver stress testing
1703 * was on a system with single edge triggering, so most sorts of
1704 * triggering arrangement should work.
1705 *
1706 * Use resource IRQ flags if set by platform device setup.
1707 */
1708 irqflags |= IRQF_SHARED;
1709 retval = usb_add_hcd(hcd, irq, irqflags);
1710 if (retval != 0)
1711 goto err6;
1712
1713 device_wakeup_enable(hcd->self.controller);
1714
1715 create_debug_file(sl811);
1716 return retval;
1717
1718 err6:
1719 usb_put_hcd(hcd);
1720 err5:
1721 if (!ioaddr)
1722 iounmap(data_reg);
1723 err4:
1724 if (!ioaddr)
1725 iounmap(addr_reg);
1726 err2:
1727 dev_dbg(&dev->dev, "init error, %d\n", retval);
1728 return retval;
1729 }
1730
1731 #ifdef CONFIG_PM
1732
1733 /* for this device there's no useful distinction between the controller
1734 * and its root hub.
1735 */
1736
1737 static int
sl811h_suspend(struct platform_device * dev,pm_message_t state)1738 sl811h_suspend(struct platform_device *dev, pm_message_t state)
1739 {
1740 struct usb_hcd *hcd = platform_get_drvdata(dev);
1741 struct sl811 *sl811 = hcd_to_sl811(hcd);
1742 int retval = 0;
1743
1744 switch (state.event) {
1745 case PM_EVENT_FREEZE:
1746 retval = sl811h_bus_suspend(hcd);
1747 break;
1748 case PM_EVENT_SUSPEND:
1749 case PM_EVENT_HIBERNATE:
1750 case PM_EVENT_PRETHAW: /* explicitly discard hw state */
1751 port_power(sl811, 0);
1752 break;
1753 }
1754 return retval;
1755 }
1756
1757 static int
sl811h_resume(struct platform_device * dev)1758 sl811h_resume(struct platform_device *dev)
1759 {
1760 struct usb_hcd *hcd = platform_get_drvdata(dev);
1761 struct sl811 *sl811 = hcd_to_sl811(hcd);
1762
1763 /* with no "check to see if VBUS is still powered" board hook,
1764 * let's assume it'd only be powered to enable remote wakeup.
1765 */
1766 if (!sl811->port1 || !device_can_wakeup(&hcd->self.root_hub->dev)) {
1767 sl811->port1 = 0;
1768 port_power(sl811, 1);
1769 usb_root_hub_lost_power(hcd->self.root_hub);
1770 return 0;
1771 }
1772
1773 return sl811h_bus_resume(hcd);
1774 }
1775
1776 #else
1777
1778 #define sl811h_suspend NULL
1779 #define sl811h_resume NULL
1780
1781 #endif
1782
1783
1784 /* this driver is exported so sl811_cs can depend on it */
1785 struct platform_driver sl811h_driver = {
1786 .probe = sl811h_probe,
1787 .remove_new = sl811h_remove,
1788
1789 .suspend = sl811h_suspend,
1790 .resume = sl811h_resume,
1791 .driver = {
1792 .name = hcd_name,
1793 },
1794 };
1795 EXPORT_SYMBOL(sl811h_driver);
1796
1797 module_platform_driver(sl811h_driver);
1798