Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6
[linux-2.6] / drivers / usb / host / sl811-hcd.c
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/platform_device.h>
49
50 #include <asm/io.h>
51 #include <asm/irq.h>
52 #include <asm/system.h>
53 #include <asm/byteorder.h>
54
55 #include "../core/hcd.h"
56 #include "sl811.h"
57
58
59 MODULE_DESCRIPTION("SL811HS USB Host Controller Driver");
60 MODULE_LICENSE("GPL");
61 MODULE_ALIAS("platform:sl811-hcd");
62
63 #define DRIVER_VERSION  "19 May 2005"
64
65
66 #ifndef DEBUG
67 #       define  STUB_DEBUG_FILE
68 #endif
69
70 /* for now, use only one transfer register bank */
71 #undef  USE_B
72
73 /* this doesn't understand urb->iso_frame_desc[], but if you had a driver
74  * that just queued one ISO frame per URB then iso transfers "should" work
75  * using the normal urb status fields.
76  */
77 #define DISABLE_ISO
78
79 // #define      QUIRK2
80 #define QUIRK3
81
82 static const char hcd_name[] = "sl811-hcd";
83
84 /*-------------------------------------------------------------------------*/
85
86 static void port_power(struct sl811 *sl811, int is_on)
87 {
88         struct usb_hcd  *hcd = sl811_to_hcd(sl811);
89
90         /* hub is inactive unless the port is powered */
91         if (is_on) {
92                 if (sl811->port1 & (1 << USB_PORT_FEAT_POWER))
93                         return;
94
95                 sl811->port1 = (1 << USB_PORT_FEAT_POWER);
96                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
97         } else {
98                 sl811->port1 = 0;
99                 sl811->irq_enable = 0;
100                 hcd->state = HC_STATE_HALT;
101         }
102         sl811->ctrl1 = 0;
103         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
104         sl811_write(sl811, SL11H_IRQ_STATUS, ~0);
105
106         if (sl811->board && sl811->board->port_power) {
107                 /* switch VBUS, at 500mA unless hub power budget gets set */
108                 DBG("power %s\n", is_on ? "on" : "off");
109                 sl811->board->port_power(hcd->self.controller, is_on);
110         }
111
112         /* reset as thoroughly as we can */
113         if (sl811->board && sl811->board->reset)
114                 sl811->board->reset(hcd->self.controller);
115         else {
116                 sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0);
117                 mdelay(20);
118         }
119
120         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
121         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
122         sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT);
123         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
124
125         // if !is_on, put into lowpower mode now
126 }
127
128 /*-------------------------------------------------------------------------*/
129
130 /* This is a PIO-only HCD.  Queueing appends URBs to the endpoint's queue,
131  * and may start I/O.  Endpoint queues are scanned during completion irq
132  * handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation.
133  *
134  * Using an external DMA engine to copy a packet at a time could work,
135  * though setup/teardown costs may be too big to make it worthwhile.
136  */
137
138 /* SETUP starts a new control request.  Devices are not allowed to
139  * STALL or NAK these; they must cancel any pending control requests.
140  */
141 static void setup_packet(
142         struct sl811            *sl811,
143         struct sl811h_ep        *ep,
144         struct urb              *urb,
145         u8                      bank,
146         u8                      control
147 )
148 {
149         u8                      addr;
150         u8                      len;
151         void __iomem            *data_reg;
152
153         addr = SL811HS_PACKET_BUF(bank == 0);
154         len = sizeof(struct usb_ctrlrequest);
155         data_reg = sl811->data_reg;
156         sl811_write_buf(sl811, addr, urb->setup_packet, len);
157
158         /* autoincrementing */
159         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
160         writeb(len, data_reg);
161         writeb(SL_SETUP /* | ep->epnum */, data_reg);
162         writeb(usb_pipedevice(urb->pipe), data_reg);
163
164         /* always OUT/data0 */ ;
165         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
166                         control | SL11H_HCTLMASK_OUT);
167         ep->length = 0;
168         PACKET("SETUP qh%p\n", ep);
169 }
170
171 /* STATUS finishes control requests, often after IN or OUT data packets */
172 static void status_packet(
173         struct sl811            *sl811,
174         struct sl811h_ep        *ep,
175         struct urb              *urb,
176         u8                      bank,
177         u8                      control
178 )
179 {
180         int                     do_out;
181         void __iomem            *data_reg;
182
183         do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe);
184         data_reg = sl811->data_reg;
185
186         /* autoincrementing */
187         sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
188         writeb(0, data_reg);
189         writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg);
190         writeb(usb_pipedevice(urb->pipe), data_reg);
191
192         /* always data1; sometimes IN */
193         control |= SL11H_HCTLMASK_TOGGLE;
194         if (do_out)
195                 control |= SL11H_HCTLMASK_OUT;
196         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
197         ep->length = 0;
198         PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "",
199                         do_out ? "out" : "in", ep);
200 }
201
202 /* IN packets can be used with any type of endpoint. here we just
203  * start the transfer, data from the peripheral may arrive later.
204  * urb->iso_frame_desc is currently ignored here...
205  */
206 static void in_packet(
207         struct sl811            *sl811,
208         struct sl811h_ep        *ep,
209         struct urb              *urb,
210         u8                      bank,
211         u8                      control
212 )
213 {
214         u8                      addr;
215         u8                      len;
216         void __iomem            *data_reg;
217
218         /* avoid losing data on overflow */
219         len = ep->maxpacket;
220         addr = SL811HS_PACKET_BUF(bank == 0);
221         if (!(control & SL11H_HCTLMASK_ISOCH)
222                         && usb_gettoggle(urb->dev, ep->epnum, 0))
223                 control |= SL11H_HCTLMASK_TOGGLE;
224         data_reg = sl811->data_reg;
225
226         /* autoincrementing */
227         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
228         writeb(len, data_reg);
229         writeb(SL_IN | ep->epnum, data_reg);
230         writeb(usb_pipedevice(urb->pipe), data_reg);
231
232         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
233         ep->length = min_t(u32, len,
234                         urb->transfer_buffer_length - urb->actual_length);
235         PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
236                         !!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
237 }
238
239 /* OUT packets can be used with any type of endpoint.
240  * urb->iso_frame_desc is currently ignored here...
241  */
242 static void out_packet(
243         struct sl811            *sl811,
244         struct sl811h_ep        *ep,
245         struct urb              *urb,
246         u8                      bank,
247         u8                      control
248 )
249 {
250         void                    *buf;
251         u8                      addr;
252         u8                      len;
253         void __iomem            *data_reg;
254
255         buf = urb->transfer_buffer + urb->actual_length;
256         prefetch(buf);
257
258         len = min_t(u32, ep->maxpacket,
259                         urb->transfer_buffer_length - urb->actual_length);
260
261         if (!(control & SL11H_HCTLMASK_ISOCH)
262                         && usb_gettoggle(urb->dev, ep->epnum, 1))
263                 control |= SL11H_HCTLMASK_TOGGLE;
264         addr = SL811HS_PACKET_BUF(bank == 0);
265         data_reg = sl811->data_reg;
266
267         sl811_write_buf(sl811, addr, buf, len);
268
269         /* autoincrementing */
270         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
271         writeb(len, data_reg);
272         writeb(SL_OUT | ep->epnum, data_reg);
273         writeb(usb_pipedevice(urb->pipe), data_reg);
274
275         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
276                         control | SL11H_HCTLMASK_OUT);
277         ep->length = len;
278         PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
279                         !!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len);
280 }
281
282 /*-------------------------------------------------------------------------*/
283
284 /* caller updates on-chip enables later */
285
286 static inline void sofirq_on(struct sl811 *sl811)
287 {
288         if (sl811->irq_enable & SL11H_INTMASK_SOFINTR)
289                 return;
290         VDBG("sof irq on\n");
291         sl811->irq_enable |= SL11H_INTMASK_SOFINTR;
292 }
293
294 static inline void sofirq_off(struct sl811 *sl811)
295 {
296         if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR))
297                 return;
298         VDBG("sof irq off\n");
299         sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR;
300 }
301
302 /*-------------------------------------------------------------------------*/
303
304 /* pick the next endpoint for a transaction, and issue it.
305  * frames start with periodic transfers (after whatever is pending
306  * from the previous frame), and the rest of the time is async
307  * transfers, scheduled round-robin.
308  */
309 static struct sl811h_ep *start(struct sl811 *sl811, u8 bank)
310 {
311         struct sl811h_ep        *ep;
312         struct urb              *urb;
313         int                     fclock;
314         u8                      control;
315
316         /* use endpoint at schedule head */
317         if (sl811->next_periodic) {
318                 ep = sl811->next_periodic;
319                 sl811->next_periodic = ep->next;
320         } else {
321                 if (sl811->next_async)
322                         ep = sl811->next_async;
323                 else if (!list_empty(&sl811->async))
324                         ep = container_of(sl811->async.next,
325                                         struct sl811h_ep, schedule);
326                 else {
327                         /* could set up the first fullspeed periodic
328                          * transfer for the next frame ...
329                          */
330                         return NULL;
331                 }
332
333 #ifdef USE_B
334                 if ((bank && sl811->active_b == ep) || sl811->active_a == ep)
335                         return NULL;
336 #endif
337
338                 if (ep->schedule.next == &sl811->async)
339                         sl811->next_async = NULL;
340                 else
341                         sl811->next_async = container_of(ep->schedule.next,
342                                         struct sl811h_ep, schedule);
343         }
344
345         if (unlikely(list_empty(&ep->hep->urb_list))) {
346                 DBG("empty %p queue?\n", ep);
347                 return NULL;
348         }
349
350         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
351         control = ep->defctrl;
352
353         /* if this frame doesn't have enough time left to transfer this
354          * packet, wait till the next frame.  too-simple algorithm...
355          */
356         fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6;
357         fclock -= 100;          /* setup takes not much time */
358         if (urb->dev->speed == USB_SPEED_LOW) {
359                 if (control & SL11H_HCTLMASK_PREAMBLE) {
360                         /* also note erratum 1: some hubs won't work */
361                         fclock -= 800;
362                 }
363                 fclock -= ep->maxpacket << 8;
364
365                 /* erratum 2: AFTERSOF only works for fullspeed */
366                 if (fclock < 0) {
367                         if (ep->period)
368                                 sl811->stat_overrun++;
369                         sofirq_on(sl811);
370                         return NULL;
371                 }
372         } else {
373                 fclock -= 12000 / 19;   /* 19 64byte packets/msec */
374                 if (fclock < 0) {
375                         if (ep->period)
376                                 sl811->stat_overrun++;
377                         control |= SL11H_HCTLMASK_AFTERSOF;
378
379                 /* throttle bulk/control irq noise */
380                 } else if (ep->nak_count)
381                         control |= SL11H_HCTLMASK_AFTERSOF;
382         }
383
384
385         switch (ep->nextpid) {
386         case USB_PID_IN:
387                 in_packet(sl811, ep, urb, bank, control);
388                 break;
389         case USB_PID_OUT:
390                 out_packet(sl811, ep, urb, bank, control);
391                 break;
392         case USB_PID_SETUP:
393                 setup_packet(sl811, ep, urb, bank, control);
394                 break;
395         case USB_PID_ACK:               /* for control status */
396                 status_packet(sl811, ep, urb, bank, control);
397                 break;
398         default:
399                 DBG("bad ep%p pid %02x\n", ep, ep->nextpid);
400                 ep = NULL;
401         }
402         return ep;
403 }
404
405 #define MIN_JIFFIES     ((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2)
406
407 static inline void start_transfer(struct sl811 *sl811)
408 {
409         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
410                 return;
411         if (sl811->active_a == NULL) {
412                 sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
413                 if (sl811->active_a != NULL)
414                         sl811->jiffies_a = jiffies + MIN_JIFFIES;
415         }
416 #ifdef USE_B
417         if (sl811->active_b == NULL) {
418                 sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
419                 if (sl811->active_b != NULL)
420                         sl811->jiffies_b = jiffies + MIN_JIFFIES;
421         }
422 #endif
423 }
424
425 static void finish_request(
426         struct sl811            *sl811,
427         struct sl811h_ep        *ep,
428         struct urb              *urb,
429         int                     status
430 ) __releases(sl811->lock) __acquires(sl811->lock)
431 {
432         unsigned                i;
433
434         if (usb_pipecontrol(urb->pipe))
435                 ep->nextpid = USB_PID_SETUP;
436
437         usb_hcd_unlink_urb_from_ep(sl811_to_hcd(sl811), urb);
438         spin_unlock(&sl811->lock);
439         usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, status);
440         spin_lock(&sl811->lock);
441
442         /* leave active endpoints in the schedule */
443         if (!list_empty(&ep->hep->urb_list))
444                 return;
445
446         /* async deschedule? */
447         if (!list_empty(&ep->schedule)) {
448                 list_del_init(&ep->schedule);
449                 if (ep == sl811->next_async)
450                         sl811->next_async = NULL;
451                 return;
452         }
453
454         /* periodic deschedule */
455         DBG("deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
456         for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
457                 struct sl811h_ep        *temp;
458                 struct sl811h_ep        **prev = &sl811->periodic[i];
459
460                 while (*prev && ((temp = *prev) != ep))
461                         prev = &temp->next;
462                 if (*prev)
463                         *prev = ep->next;
464                 sl811->load[i] -= ep->load;
465         }
466         ep->branch = PERIODIC_SIZE;
467         sl811->periodic_count--;
468         sl811_to_hcd(sl811)->self.bandwidth_allocated
469                 -= ep->load / ep->period;
470         if (ep == sl811->next_periodic)
471                 sl811->next_periodic = ep->next;
472
473         /* we might turn SOFs back on again for the async schedule */
474         if (sl811->periodic_count == 0)
475                 sofirq_off(sl811);
476 }
477
478 static void
479 done(struct sl811 *sl811, struct sl811h_ep *ep, u8 bank)
480 {
481         u8                      status;
482         struct urb              *urb;
483         int                     urbstat = -EINPROGRESS;
484
485         if (unlikely(!ep))
486                 return;
487
488         status = sl811_read(sl811, bank + SL11H_PKTSTATREG);
489
490         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
491
492         /* we can safely ignore NAKs */
493         if (status & SL11H_STATMASK_NAK) {
494                 // PACKET("...NAK_%02x qh%p\n", bank, ep);
495                 if (!ep->period)
496                         ep->nak_count++;
497                 ep->error_count = 0;
498
499         /* ACK advances transfer, toggle, and maybe queue */
500         } else if (status & SL11H_STATMASK_ACK) {
501                 struct usb_device       *udev = urb->dev;
502                 int                     len;
503                 unsigned char           *buf;
504
505                 /* urb->iso_frame_desc is currently ignored here... */
506
507                 ep->nak_count = ep->error_count = 0;
508                 switch (ep->nextpid) {
509                 case USB_PID_OUT:
510                         // PACKET("...ACK/out_%02x qh%p\n", bank, ep);
511                         urb->actual_length += ep->length;
512                         usb_dotoggle(udev, ep->epnum, 1);
513                         if (urb->actual_length
514                                         == urb->transfer_buffer_length) {
515                                 if (usb_pipecontrol(urb->pipe))
516                                         ep->nextpid = USB_PID_ACK;
517
518                                 /* some bulk protocols terminate OUT transfers
519                                  * by a short packet, using ZLPs not padding.
520                                  */
521                                 else if (ep->length < ep->maxpacket
522                                                 || !(urb->transfer_flags
523                                                         & URB_ZERO_PACKET))
524                                         urbstat = 0;
525                         }
526                         break;
527                 case USB_PID_IN:
528                         // PACKET("...ACK/in_%02x qh%p\n", bank, ep);
529                         buf = urb->transfer_buffer + urb->actual_length;
530                         prefetchw(buf);
531                         len = ep->maxpacket - sl811_read(sl811,
532                                                 bank + SL11H_XFERCNTREG);
533                         if (len > ep->length) {
534                                 len = ep->length;
535                                 urbstat = -EOVERFLOW;
536                         }
537                         urb->actual_length += len;
538                         sl811_read_buf(sl811, SL811HS_PACKET_BUF(bank == 0),
539                                         buf, len);
540                         usb_dotoggle(udev, ep->epnum, 0);
541                         if (urbstat == -EINPROGRESS &&
542                                         (len < ep->maxpacket ||
543                                                 urb->actual_length ==
544                                                 urb->transfer_buffer_length)) {
545                                 if (usb_pipecontrol(urb->pipe))
546                                         ep->nextpid = USB_PID_ACK;
547                                 else
548                                         urbstat = 0;
549                         }
550                         break;
551                 case USB_PID_SETUP:
552                         // PACKET("...ACK/setup_%02x qh%p\n", bank, ep);
553                         if (urb->transfer_buffer_length == urb->actual_length)
554                                 ep->nextpid = USB_PID_ACK;
555                         else if (usb_pipeout(urb->pipe)) {
556                                 usb_settoggle(udev, 0, 1, 1);
557                                 ep->nextpid = USB_PID_OUT;
558                         } else {
559                                 usb_settoggle(udev, 0, 0, 1);
560                                 ep->nextpid = USB_PID_IN;
561                         }
562                         break;
563                 case USB_PID_ACK:
564                         // PACKET("...ACK/status_%02x qh%p\n", bank, ep);
565                         urbstat = 0;
566                         break;
567                 }
568
569         /* STALL stops all transfers */
570         } else if (status & SL11H_STATMASK_STALL) {
571                 PACKET("...STALL_%02x qh%p\n", bank, ep);
572                 ep->nak_count = ep->error_count = 0;
573                 urbstat = -EPIPE;
574
575         /* error? retry, until "3 strikes" */
576         } else if (++ep->error_count >= 3) {
577                 if (status & SL11H_STATMASK_TMOUT)
578                         urbstat = -ETIME;
579                 else if (status & SL11H_STATMASK_OVF)
580                         urbstat = -EOVERFLOW;
581                 else
582                         urbstat = -EPROTO;
583                 ep->error_count = 0;
584                 PACKET("...3STRIKES_%02x %02x qh%p stat %d\n",
585                                 bank, status, ep, urbstat);
586         }
587
588         if (urbstat != -EINPROGRESS || urb->unlinked)
589                 finish_request(sl811, ep, urb, urbstat);
590 }
591
592 static inline u8 checkdone(struct sl811 *sl811)
593 {
594         u8      ctl;
595         u8      irqstat = 0;
596
597         if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) {
598                 ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG));
599                 if (ctl & SL11H_HCTLMASK_ARM)
600                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
601                 DBG("%s DONE_A: ctrl %02x sts %02x\n",
602                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
603                         ctl,
604                         sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
605                 irqstat |= SL11H_INTMASK_DONE_A;
606         }
607 #ifdef  USE_B
608         if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) {
609                 ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG));
610                 if (ctl & SL11H_HCTLMASK_ARM)
611                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
612                 DBG("%s DONE_B: ctrl %02x sts %02x\n",
613                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
614                         ctl,
615                         sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
616                 irqstat |= SL11H_INTMASK_DONE_A;
617         }
618 #endif
619         return irqstat;
620 }
621
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                         // ERR("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         /* khubd 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 khubd clean up later.
721                  */
722                 sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
723                                 | (1 << USB_PORT_FEAT_CONNECTION);
724
725         } else if (irqstat & SL11H_INTMASK_RD) {
726                 if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)) {
727                         DBG("wakeup\n");
728                         sl811->port1 |= 1 << USB_PORT_FEAT_C_SUSPEND;
729                         sl811->stat_wake++;
730                 } else
731                         irqstat &= ~SL11H_INTMASK_RD;
732         }
733
734         if (irqstat) {
735                 if (sl811->port1 & (1 << USB_PORT_FEAT_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 #ifdef  DISABLE_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
814         spin_lock_irqsave(&sl811->lock, flags);
815
816         /* don't submit to a dead or disabled port */
817         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
818                         || !HC_IS_RUNNING(hcd->state)) {
819                 retval = -ENODEV;
820                 kfree(ep);
821                 goto fail_not_linked;
822         }
823         retval = usb_hcd_link_urb_to_ep(hcd, urb);
824         if (retval) {
825                 kfree(ep);
826                 goto fail_not_linked;
827         }
828
829         if (hep->hcpriv) {
830                 kfree(ep);
831                 ep = hep->hcpriv;
832         } else if (!ep) {
833                 retval = -ENOMEM;
834                 goto fail;
835
836         } else {
837                 INIT_LIST_HEAD(&ep->schedule);
838                 ep->udev = udev;
839                 ep->epnum = epnum;
840                 ep->maxpacket = usb_maxpacket(udev, urb->pipe, is_out);
841                 ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE;
842                 usb_settoggle(udev, epnum, is_out, 0);
843
844                 if (type == PIPE_CONTROL)
845                         ep->nextpid = USB_PID_SETUP;
846                 else if (is_out)
847                         ep->nextpid = USB_PID_OUT;
848                 else
849                         ep->nextpid = USB_PID_IN;
850
851                 if (ep->maxpacket > H_MAXPACKET) {
852                         /* iso packets up to 240 bytes could work... */
853                         DBG("dev %d ep%d maxpacket %d\n",
854                                 udev->devnum, epnum, ep->maxpacket);
855                         retval = -EINVAL;
856                         goto fail;
857                 }
858
859                 if (udev->speed == USB_SPEED_LOW) {
860                         /* send preamble for external hub? */
861                         if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD))
862                                 ep->defctrl |= SL11H_HCTLMASK_PREAMBLE;
863                 }
864                 switch (type) {
865                 case PIPE_ISOCHRONOUS:
866                 case PIPE_INTERRUPT:
867                         if (urb->interval > PERIODIC_SIZE)
868                                 urb->interval = PERIODIC_SIZE;
869                         ep->period = urb->interval;
870                         ep->branch = PERIODIC_SIZE;
871                         if (type == PIPE_ISOCHRONOUS)
872                                 ep->defctrl |= SL11H_HCTLMASK_ISOCH;
873                         ep->load = usb_calc_bus_time(udev->speed, !is_out,
874                                 (type == PIPE_ISOCHRONOUS),
875                                 usb_maxpacket(udev, pipe, is_out))
876                                         / 1000;
877                         break;
878                 }
879
880                 ep->hep = hep;
881                 hep->hcpriv = ep;
882         }
883
884         /* maybe put endpoint into schedule */
885         switch (type) {
886         case PIPE_CONTROL:
887         case PIPE_BULK:
888                 if (list_empty(&ep->schedule))
889                         list_add_tail(&ep->schedule, &sl811->async);
890                 break;
891         case PIPE_ISOCHRONOUS:
892         case PIPE_INTERRUPT:
893                 urb->interval = ep->period;
894                 if (ep->branch < PERIODIC_SIZE) {
895                         /* NOTE:  the phase is correct here, but the value
896                          * needs offsetting by the transfer queue depth.
897                          * All current drivers ignore start_frame, so this
898                          * is unlikely to ever matter...
899                          */
900                         urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
901                                                 + ep->branch;
902                         break;
903                 }
904
905                 retval = balance(sl811, ep->period, ep->load);
906                 if (retval < 0)
907                         goto fail;
908                 ep->branch = retval;
909                 retval = 0;
910                 urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
911                                         + ep->branch;
912
913                 /* sort each schedule branch by period (slow before fast)
914                  * to share the faster parts of the tree without needing
915                  * dummy/placeholder nodes
916                  */
917                 DBG("schedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
918                 for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
919                         struct sl811h_ep        **prev = &sl811->periodic[i];
920                         struct sl811h_ep        *here = *prev;
921
922                         while (here && ep != here) {
923                                 if (ep->period > here->period)
924                                         break;
925                                 prev = &here->next;
926                                 here = *prev;
927                         }
928                         if (ep != here) {
929                                 ep->next = here;
930                                 *prev = ep;
931                         }
932                         sl811->load[i] += ep->load;
933                 }
934                 sl811->periodic_count++;
935                 hcd->self.bandwidth_allocated += ep->load / ep->period;
936                 sofirq_on(sl811);
937         }
938
939         urb->hcpriv = hep;
940         start_transfer(sl811);
941         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
942 fail:
943         if (retval)
944                 usb_hcd_unlink_urb_from_ep(hcd, urb);
945 fail_not_linked:
946         spin_unlock_irqrestore(&sl811->lock, flags);
947         return retval;
948 }
949
950 static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
951 {
952         struct sl811            *sl811 = hcd_to_sl811(hcd);
953         struct usb_host_endpoint *hep;
954         unsigned long           flags;
955         struct sl811h_ep        *ep;
956         int                     retval;
957
958         spin_lock_irqsave(&sl811->lock, flags);
959         retval = usb_hcd_check_unlink_urb(hcd, urb, status);
960         if (retval)
961                 goto fail;
962
963         hep = urb->hcpriv;
964         ep = hep->hcpriv;
965         if (ep) {
966                 /* finish right away if this urb can't be active ...
967                  * note that some drivers wrongly expect delays
968                  */
969                 if (ep->hep->urb_list.next != &urb->urb_list) {
970                         /* not front of queue?  never active */
971
972                 /* for active transfers, we expect an IRQ */
973                 } else if (sl811->active_a == ep) {
974                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
975                                 /* happens a lot with lowspeed?? */
976                                 DBG("giveup on DONE_A: ctrl %02x sts %02x\n",
977                                         sl811_read(sl811,
978                                                 SL811_EP_A(SL11H_HOSTCTLREG)),
979                                         sl811_read(sl811,
980                                                 SL811_EP_A(SL11H_PKTSTATREG)));
981                                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
982                                                 0);
983                                 sl811->active_a = NULL;
984                         } else
985                                 urb = NULL;
986 #ifdef  USE_B
987                 } else if (sl811->active_b == ep) {
988                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
989                                 /* happens a lot with lowspeed?? */
990                                 DBG("giveup on DONE_B: ctrl %02x sts %02x\n",
991                                         sl811_read(sl811,
992                                                 SL811_EP_B(SL11H_HOSTCTLREG)),
993                                         sl811_read(sl811,
994                                                 SL811_EP_B(SL11H_PKTSTATREG)));
995                                 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG),
996                                                 0);
997                                 sl811->active_b = NULL;
998                         } else
999                                 urb = NULL;
1000 #endif
1001                 } else {
1002                         /* front of queue for inactive endpoint */
1003                 }
1004
1005                 if (urb)
1006                         finish_request(sl811, ep, urb, 0);
1007                 else
1008                         VDBG("dequeue, urb %p active %s; wait4irq\n", urb,
1009                                 (sl811->active_a == ep) ? "A" : "B");
1010         } else
1011                 retval = -EINVAL;
1012  fail:
1013         spin_unlock_irqrestore(&sl811->lock, flags);
1014         return retval;
1015 }
1016
1017 static void
1018 sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
1019 {
1020         struct sl811h_ep        *ep = hep->hcpriv;
1021
1022         if (!ep)
1023                 return;
1024
1025         /* assume we'd just wait for the irq */
1026         if (!list_empty(&hep->urb_list))
1027                 msleep(3);
1028         if (!list_empty(&hep->urb_list))
1029                 WARNING("ep %p not empty?\n", ep);
1030
1031         kfree(ep);
1032         hep->hcpriv = NULL;
1033 }
1034
1035 static int
1036 sl811h_get_frame(struct usb_hcd *hcd)
1037 {
1038         struct sl811 *sl811 = hcd_to_sl811(hcd);
1039
1040         /* wrong except while periodic transfers are scheduled;
1041          * never matches the on-the-wire frame;
1042          * subject to overruns.
1043          */
1044         return sl811->frame;
1045 }
1046
1047
1048 /*-------------------------------------------------------------------------*/
1049
1050 /* the virtual root hub timer IRQ checks for hub status */
1051 static int
1052 sl811h_hub_status_data(struct usb_hcd *hcd, char *buf)
1053 {
1054         struct sl811 *sl811 = hcd_to_sl811(hcd);
1055 #ifdef  QUIRK3
1056         unsigned long flags;
1057
1058         /* non-SMP HACK: use root hub timer as i/o watchdog
1059          * this seems essential when SOF IRQs aren't in use...
1060          */
1061         local_irq_save(flags);
1062         if (!timer_pending(&sl811->timer)) {
1063                 if (sl811h_irq( /* ~0, */ hcd) != IRQ_NONE)
1064                         sl811->stat_lost++;
1065         }
1066         local_irq_restore(flags);
1067 #endif
1068
1069         if (!(sl811->port1 & (0xffff << 16)))
1070                 return 0;
1071
1072         /* tell khubd port 1 changed */
1073         *buf = (1 << 1);
1074         return 1;
1075 }
1076
1077 static void
1078 sl811h_hub_descriptor (
1079         struct sl811                    *sl811,
1080         struct usb_hub_descriptor       *desc
1081 ) {
1082         u16             temp = 0;
1083
1084         desc->bDescriptorType = 0x29;
1085         desc->bHubContrCurrent = 0;
1086
1087         desc->bNbrPorts = 1;
1088         desc->bDescLength = 9;
1089
1090         /* per-port power switching (gang of one!), or none */
1091         desc->bPwrOn2PwrGood = 0;
1092         if (sl811->board && sl811->board->port_power) {
1093                 desc->bPwrOn2PwrGood = sl811->board->potpg;
1094                 if (!desc->bPwrOn2PwrGood)
1095                         desc->bPwrOn2PwrGood = 10;
1096                 temp = 0x0001;
1097         } else
1098                 temp = 0x0002;
1099
1100         /* no overcurrent errors detection/handling */
1101         temp |= 0x0010;
1102
1103         desc->wHubCharacteristics = cpu_to_le16(temp);
1104
1105         /* two bitmaps:  ports removable, and legacy PortPwrCtrlMask */
1106         desc->bitmap[0] = 0 << 1;
1107         desc->bitmap[1] = ~0;
1108 }
1109
1110 static void
1111 sl811h_timer(unsigned long _sl811)
1112 {
1113         struct sl811    *sl811 = (void *) _sl811;
1114         unsigned long   flags;
1115         u8              irqstat;
1116         u8              signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE;
1117         const u32       mask = (1 << USB_PORT_FEAT_CONNECTION)
1118                                 | (1 << USB_PORT_FEAT_ENABLE)
1119                                 | (1 << USB_PORT_FEAT_LOWSPEED);
1120
1121         spin_lock_irqsave(&sl811->lock, flags);
1122
1123         /* stop special signaling */
1124         sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE;
1125         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1126         udelay(3);
1127
1128         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS);
1129
1130         switch (signaling) {
1131         case SL11H_CTL1MASK_SE0:
1132                 DBG("end reset\n");
1133                 sl811->port1 = (1 << USB_PORT_FEAT_C_RESET)
1134                                 | (1 << USB_PORT_FEAT_POWER);
1135                 sl811->ctrl1 = 0;
1136                 /* don't wrongly ack RD */
1137                 if (irqstat & SL11H_INTMASK_INSRMV)
1138                         irqstat &= ~SL11H_INTMASK_RD;
1139                 break;
1140         case SL11H_CTL1MASK_K:
1141                 DBG("end resume\n");
1142                 sl811->port1 &= ~(1 << USB_PORT_FEAT_SUSPEND);
1143                 break;
1144         default:
1145                 DBG("odd timer signaling: %02x\n", signaling);
1146                 break;
1147         }
1148         sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
1149
1150         if (irqstat & SL11H_INTMASK_RD) {
1151                 /* usbcore nukes all pending transactions on disconnect */
1152                 if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION))
1153                         sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
1154                                         | (1 << USB_PORT_FEAT_C_ENABLE);
1155                 sl811->port1 &= ~mask;
1156                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
1157         } else {
1158                 sl811->port1 |= mask;
1159                 if (irqstat & SL11H_INTMASK_DP)
1160                         sl811->port1 &= ~(1 << USB_PORT_FEAT_LOWSPEED);
1161                 sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD;
1162         }
1163
1164         if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION)) {
1165                 u8      ctrl2 = SL811HS_CTL2_INIT;
1166
1167                 sl811->irq_enable |= SL11H_INTMASK_DONE_A;
1168 #ifdef USE_B
1169                 sl811->irq_enable |= SL11H_INTMASK_DONE_B;
1170 #endif
1171                 if (sl811->port1 & (1 << USB_PORT_FEAT_LOWSPEED)) {
1172                         sl811->ctrl1 |= SL11H_CTL1MASK_LSPD;
1173                         ctrl2 |= SL811HS_CTL2MASK_DSWAP;
1174                 }
1175
1176                 /* start SOFs flowing, kickstarting with A registers */
1177                 sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA;
1178                 sl811_write(sl811, SL11H_SOFLOWREG, 0xe0);
1179                 sl811_write(sl811, SL811HS_CTLREG2, ctrl2);
1180
1181                 /* autoincrementing */
1182                 sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0);
1183                 writeb(SL_SOF, sl811->data_reg);
1184                 writeb(0, sl811->data_reg);
1185                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1186                                 SL11H_HCTLMASK_ARM);
1187
1188                 /* khubd provides debounce delay */
1189         } else {
1190                 sl811->ctrl1 = 0;
1191         }
1192         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1193
1194         /* reenable irqs */
1195         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
1196         spin_unlock_irqrestore(&sl811->lock, flags);
1197 }
1198
1199 static int
1200 sl811h_hub_control(
1201         struct usb_hcd  *hcd,
1202         u16             typeReq,
1203         u16             wValue,
1204         u16             wIndex,
1205         char            *buf,
1206         u16             wLength
1207 ) {
1208         struct sl811    *sl811 = hcd_to_sl811(hcd);
1209         int             retval = 0;
1210         unsigned long   flags;
1211
1212         spin_lock_irqsave(&sl811->lock, flags);
1213
1214         switch (typeReq) {
1215         case ClearHubFeature:
1216         case SetHubFeature:
1217                 switch (wValue) {
1218                 case C_HUB_OVER_CURRENT:
1219                 case C_HUB_LOCAL_POWER:
1220                         break;
1221                 default:
1222                         goto error;
1223                 }
1224                 break;
1225         case ClearPortFeature:
1226                 if (wIndex != 1 || wLength != 0)
1227                         goto error;
1228
1229                 switch (wValue) {
1230                 case USB_PORT_FEAT_ENABLE:
1231                         sl811->port1 &= (1 << USB_PORT_FEAT_POWER);
1232                         sl811->ctrl1 = 0;
1233                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1234                         sl811->irq_enable = SL11H_INTMASK_INSRMV;
1235                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1236                                                 sl811->irq_enable);
1237                         break;
1238                 case USB_PORT_FEAT_SUSPEND:
1239                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)))
1240                                 break;
1241
1242                         /* 20 msec of resume/K signaling, other irqs blocked */
1243                         DBG("start resume...\n");
1244                         sl811->irq_enable = 0;
1245                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1246                                                 sl811->irq_enable);
1247                         sl811->ctrl1 |= SL11H_CTL1MASK_K;
1248                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1249
1250                         mod_timer(&sl811->timer, jiffies
1251                                         + msecs_to_jiffies(20));
1252                         break;
1253                 case USB_PORT_FEAT_POWER:
1254                         port_power(sl811, 0);
1255                         break;
1256                 case USB_PORT_FEAT_C_ENABLE:
1257                 case USB_PORT_FEAT_C_SUSPEND:
1258                 case USB_PORT_FEAT_C_CONNECTION:
1259                 case USB_PORT_FEAT_C_OVER_CURRENT:
1260                 case USB_PORT_FEAT_C_RESET:
1261                         break;
1262                 default:
1263                         goto error;
1264                 }
1265                 sl811->port1 &= ~(1 << wValue);
1266                 break;
1267         case GetHubDescriptor:
1268                 sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf);
1269                 break;
1270         case GetHubStatus:
1271                 *(__le32 *) buf = cpu_to_le32(0);
1272                 break;
1273         case GetPortStatus:
1274                 if (wIndex != 1)
1275                         goto error;
1276                 *(__le32 *) buf = cpu_to_le32(sl811->port1);
1277
1278 #ifndef VERBOSE
1279         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
1280 #endif
1281                 DBG("GetPortStatus %08x\n", sl811->port1);
1282                 break;
1283         case SetPortFeature:
1284                 if (wIndex != 1 || wLength != 0)
1285                         goto error;
1286                 switch (wValue) {
1287                 case USB_PORT_FEAT_SUSPEND:
1288                         if (sl811->port1 & (1 << USB_PORT_FEAT_RESET))
1289                                 goto error;
1290                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE)))
1291                                 goto error;
1292
1293                         DBG("suspend...\n");
1294                         sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA;
1295                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1296                         break;
1297                 case USB_PORT_FEAT_POWER:
1298                         port_power(sl811, 1);
1299                         break;
1300                 case USB_PORT_FEAT_RESET:
1301                         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
1302                                 goto error;
1303                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_POWER)))
1304                                 break;
1305
1306                         /* 50 msec of reset/SE0 signaling, irqs blocked */
1307                         sl811->irq_enable = 0;
1308                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1309                                                 sl811->irq_enable);
1310                         sl811->ctrl1 = SL11H_CTL1MASK_SE0;
1311                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1312                         sl811->port1 |= (1 << USB_PORT_FEAT_RESET);
1313                         mod_timer(&sl811->timer, jiffies
1314                                         + msecs_to_jiffies(50));
1315                         break;
1316                 default:
1317                         goto error;
1318                 }
1319                 sl811->port1 |= 1 << wValue;
1320                 break;
1321
1322         default:
1323 error:
1324                 /* "protocol stall" on error */
1325                 retval = -EPIPE;
1326         }
1327
1328         spin_unlock_irqrestore(&sl811->lock, flags);
1329         return retval;
1330 }
1331
1332 #ifdef  CONFIG_PM
1333
1334 static int
1335 sl811h_bus_suspend(struct usb_hcd *hcd)
1336 {
1337         // SOFs off
1338         DBG("%s\n", __func__);
1339         return 0;
1340 }
1341
1342 static int
1343 sl811h_bus_resume(struct usb_hcd *hcd)
1344 {
1345         // SOFs on
1346         DBG("%s\n", __func__);
1347         return 0;
1348 }
1349
1350 #else
1351
1352 #define sl811h_bus_suspend      NULL
1353 #define sl811h_bus_resume       NULL
1354
1355 #endif
1356
1357
1358 /*-------------------------------------------------------------------------*/
1359
1360 #ifdef STUB_DEBUG_FILE
1361
1362 static inline void create_debug_file(struct sl811 *sl811) { }
1363 static inline void remove_debug_file(struct sl811 *sl811) { }
1364
1365 #else
1366
1367 #include <linux/proc_fs.h>
1368 #include <linux/seq_file.h>
1369
1370 static void dump_irq(struct seq_file *s, char *label, u8 mask)
1371 {
1372         seq_printf(s, "%s %02x%s%s%s%s%s%s\n", label, mask,
1373                 (mask & SL11H_INTMASK_DONE_A) ? " done_a" : "",
1374                 (mask & SL11H_INTMASK_DONE_B) ? " done_b" : "",
1375                 (mask & SL11H_INTMASK_SOFINTR) ? " sof" : "",
1376                 (mask & SL11H_INTMASK_INSRMV) ? " ins/rmv" : "",
1377                 (mask & SL11H_INTMASK_RD) ? " rd" : "",
1378                 (mask & SL11H_INTMASK_DP) ? " dp" : "");
1379 }
1380
1381 static int proc_sl811h_show(struct seq_file *s, void *unused)
1382 {
1383         struct sl811            *sl811 = s->private;
1384         struct sl811h_ep        *ep;
1385         unsigned                i;
1386
1387         seq_printf(s, "%s\n%s version %s\nportstatus[1] = %08x\n",
1388                 sl811_to_hcd(sl811)->product_desc,
1389                 hcd_name, DRIVER_VERSION,
1390                 sl811->port1);
1391
1392         seq_printf(s, "insert/remove: %ld\n", sl811->stat_insrmv);
1393         seq_printf(s, "current session:  done_a %ld done_b %ld "
1394                         "wake %ld sof %ld overrun %ld lost %ld\n\n",
1395                 sl811->stat_a, sl811->stat_b,
1396                 sl811->stat_wake, sl811->stat_sof,
1397                 sl811->stat_overrun, sl811->stat_lost);
1398
1399         spin_lock_irq(&sl811->lock);
1400
1401         if (sl811->ctrl1 & SL11H_CTL1MASK_SUSPEND)
1402                 seq_printf(s, "(suspended)\n\n");
1403         else {
1404                 u8      t = sl811_read(sl811, SL11H_CTLREG1);
1405
1406                 seq_printf(s, "ctrl1 %02x%s%s%s%s\n", t,
1407                         (t & SL11H_CTL1MASK_SOF_ENA) ? " sofgen" : "",
1408                         ({char *s; switch (t & SL11H_CTL1MASK_FORCE) {
1409                         case SL11H_CTL1MASK_NORMAL: s = ""; break;
1410                         case SL11H_CTL1MASK_SE0: s = " se0/reset"; break;
1411                         case SL11H_CTL1MASK_K: s = " k/resume"; break;
1412                         default: s = "j"; break;
1413                         }; s; }),
1414                         (t & SL11H_CTL1MASK_LSPD) ? " lowspeed" : "",
1415                         (t & SL11H_CTL1MASK_SUSPEND) ? " suspend" : "");
1416
1417                 dump_irq(s, "irq_enable",
1418                                 sl811_read(sl811, SL11H_IRQ_ENABLE));
1419                 dump_irq(s, "irq_status",
1420                                 sl811_read(sl811, SL11H_IRQ_STATUS));
1421                 seq_printf(s, "frame clocks remaining:  %d\n",
1422                                 sl811_read(sl811, SL11H_SOFTMRREG) << 6);
1423         }
1424
1425         seq_printf(s, "A: qh%p ctl %02x sts %02x\n", sl811->active_a,
1426                 sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)),
1427                 sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
1428         seq_printf(s, "B: qh%p ctl %02x sts %02x\n", sl811->active_b,
1429                 sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)),
1430                 sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
1431         seq_printf(s, "\n");
1432         list_for_each_entry (ep, &sl811->async, schedule) {
1433                 struct urb              *urb;
1434
1435                 seq_printf(s, "%s%sqh%p, ep%d%s, maxpacket %d"
1436                                         " nak %d err %d\n",
1437                         (ep == sl811->active_a) ? "(A) " : "",
1438                         (ep == sl811->active_b) ? "(B) " : "",
1439                         ep, ep->epnum,
1440                         ({ char *s; switch (ep->nextpid) {
1441                         case USB_PID_IN: s = "in"; break;
1442                         case USB_PID_OUT: s = "out"; break;
1443                         case USB_PID_SETUP: s = "setup"; break;
1444                         case USB_PID_ACK: s = "status"; break;
1445                         default: s = "?"; break;
1446                         }; s;}),
1447                         ep->maxpacket,
1448                         ep->nak_count, ep->error_count);
1449                 list_for_each_entry (urb, &ep->hep->urb_list, urb_list) {
1450                         seq_printf(s, "  urb%p, %d/%d\n", urb,
1451                                 urb->actual_length,
1452                                 urb->transfer_buffer_length);
1453                 }
1454         }
1455         if (!list_empty(&sl811->async))
1456                 seq_printf(s, "\n");
1457
1458         seq_printf(s, "periodic size= %d\n", PERIODIC_SIZE);
1459
1460         for (i = 0; i < PERIODIC_SIZE; i++) {
1461                 ep = sl811->periodic[i];
1462                 if (!ep)
1463                         continue;
1464                 seq_printf(s, "%2d [%3d]:\n", i, sl811->load[i]);
1465
1466                 /* DUMB: prints shared entries multiple times */
1467                 do {
1468                         seq_printf(s,
1469                                 "   %s%sqh%d/%p (%sdev%d ep%d%s max %d) "
1470                                         "err %d\n",
1471                                 (ep == sl811->active_a) ? "(A) " : "",
1472                                 (ep == sl811->active_b) ? "(B) " : "",
1473                                 ep->period, ep,
1474                                 (ep->udev->speed == USB_SPEED_FULL)
1475                                         ? "" : "ls ",
1476                                 ep->udev->devnum, ep->epnum,
1477                                 (ep->epnum == 0) ? ""
1478                                         : ((ep->nextpid == USB_PID_IN)
1479                                                 ? "in"
1480                                                 : "out"),
1481                                 ep->maxpacket, ep->error_count);
1482                         ep = ep->next;
1483                 } while (ep);
1484         }
1485
1486         spin_unlock_irq(&sl811->lock);
1487         seq_printf(s, "\n");
1488
1489         return 0;
1490 }
1491
1492 static int proc_sl811h_open(struct inode *inode, struct file *file)
1493 {
1494         return single_open(file, proc_sl811h_show, PDE(inode)->data);
1495 }
1496
1497 static const struct file_operations proc_ops = {
1498         .open           = proc_sl811h_open,
1499         .read           = seq_read,
1500         .llseek         = seq_lseek,
1501         .release        = single_release,
1502 };
1503
1504 /* expect just one sl811 per system */
1505 static const char proc_filename[] = "driver/sl811h";
1506
1507 static void create_debug_file(struct sl811 *sl811)
1508 {
1509         sl811->pde = proc_create_data(proc_filename, 0, NULL, &proc_ops, sl811);
1510 }
1511
1512 static void remove_debug_file(struct sl811 *sl811)
1513 {
1514         if (sl811->pde)
1515                 remove_proc_entry(proc_filename, NULL);
1516 }
1517
1518 #endif
1519
1520 /*-------------------------------------------------------------------------*/
1521
1522 static void
1523 sl811h_stop(struct usb_hcd *hcd)
1524 {
1525         struct sl811    *sl811 = hcd_to_sl811(hcd);
1526         unsigned long   flags;
1527
1528         del_timer_sync(&hcd->rh_timer);
1529
1530         spin_lock_irqsave(&sl811->lock, flags);
1531         port_power(sl811, 0);
1532         spin_unlock_irqrestore(&sl811->lock, flags);
1533 }
1534
1535 static int
1536 sl811h_start(struct usb_hcd *hcd)
1537 {
1538         struct sl811            *sl811 = hcd_to_sl811(hcd);
1539
1540         /* chip has been reset, VBUS power is off */
1541         hcd->state = HC_STATE_RUNNING;
1542
1543         if (sl811->board) {
1544                 if (!device_can_wakeup(hcd->self.controller))
1545                         device_init_wakeup(hcd->self.controller,
1546                                 sl811->board->can_wakeup);
1547                 hcd->power_budget = sl811->board->power * 2;
1548         }
1549
1550         /* enable power and interrupts */
1551         port_power(sl811, 1);
1552
1553         return 0;
1554 }
1555
1556 /*-------------------------------------------------------------------------*/
1557
1558 static struct hc_driver sl811h_hc_driver = {
1559         .description =          hcd_name,
1560         .hcd_priv_size =        sizeof(struct sl811),
1561
1562         /*
1563          * generic hardware linkage
1564          */
1565         .irq =                  sl811h_irq,
1566         .flags =                HCD_USB11 | HCD_MEMORY,
1567
1568         /* Basic lifecycle operations */
1569         .start =                sl811h_start,
1570         .stop =                 sl811h_stop,
1571
1572         /*
1573          * managing i/o requests and associated device resources
1574          */
1575         .urb_enqueue =          sl811h_urb_enqueue,
1576         .urb_dequeue =          sl811h_urb_dequeue,
1577         .endpoint_disable =     sl811h_endpoint_disable,
1578
1579         /*
1580          * periodic schedule support
1581          */
1582         .get_frame_number =     sl811h_get_frame,
1583
1584         /*
1585          * root hub support
1586          */
1587         .hub_status_data =      sl811h_hub_status_data,
1588         .hub_control =          sl811h_hub_control,
1589         .bus_suspend =          sl811h_bus_suspend,
1590         .bus_resume =           sl811h_bus_resume,
1591 };
1592
1593 /*-------------------------------------------------------------------------*/
1594
1595 static int __devexit
1596 sl811h_remove(struct platform_device *dev)
1597 {
1598         struct usb_hcd          *hcd = platform_get_drvdata(dev);
1599         struct sl811            *sl811 = hcd_to_sl811(hcd);
1600         struct resource         *res;
1601
1602         remove_debug_file(sl811);
1603         usb_remove_hcd(hcd);
1604
1605         /* some platforms may use IORESOURCE_IO */
1606         res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1607         if (res)
1608                 iounmap(sl811->data_reg);
1609
1610         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1611         if (res)
1612                 iounmap(sl811->addr_reg);
1613
1614         usb_put_hcd(hcd);
1615         return 0;
1616 }
1617
1618 static int __devinit
1619 sl811h_probe(struct platform_device *dev)
1620 {
1621         struct usb_hcd          *hcd;
1622         struct sl811            *sl811;
1623         struct resource         *addr, *data, *ires;
1624         int                     irq;
1625         void __iomem            *addr_reg;
1626         void __iomem            *data_reg;
1627         int                     retval;
1628         u8                      tmp, ioaddr = 0;
1629         unsigned long           irqflags;
1630
1631         /* basic sanity checks first.  board-specific init logic should
1632          * have initialized these three resources and probably board
1633          * specific platform_data.  we don't probe for IRQs, and do only
1634          * minimal sanity checking.
1635          */
1636         ires = platform_get_resource(dev, IORESOURCE_IRQ, 0);
1637         if (dev->num_resources < 3 || !ires)
1638                 return -ENODEV;
1639
1640         irq = ires->start;
1641         irqflags = ires->flags & IRQF_TRIGGER_MASK;
1642
1643         /* refuse to confuse usbcore */
1644         if (dev->dev.dma_mask) {
1645                 DBG("no we won't dma\n");
1646                 return -EINVAL;
1647         }
1648
1649         /* the chip may be wired for either kind of addressing */
1650         addr = platform_get_resource(dev, IORESOURCE_MEM, 0);
1651         data = platform_get_resource(dev, IORESOURCE_MEM, 1);
1652         retval = -EBUSY;
1653         if (!addr || !data) {
1654                 addr = platform_get_resource(dev, IORESOURCE_IO, 0);
1655                 data = platform_get_resource(dev, IORESOURCE_IO, 1);
1656                 if (!addr || !data)
1657                         return -ENODEV;
1658                 ioaddr = 1;
1659                 /*
1660                  * NOTE: 64-bit resource->start is getting truncated
1661                  * to avoid compiler warning, assuming that ->start
1662                  * is always 32-bit for this case
1663                  */
1664                 addr_reg = (void __iomem *) (unsigned long) addr->start;
1665                 data_reg = (void __iomem *) (unsigned long) data->start;
1666         } else {
1667                 addr_reg = ioremap(addr->start, 1);
1668                 if (addr_reg == NULL) {
1669                         retval = -ENOMEM;
1670                         goto err2;
1671                 }
1672
1673                 data_reg = ioremap(data->start, 1);
1674                 if (data_reg == NULL) {
1675                         retval = -ENOMEM;
1676                         goto err4;
1677                 }
1678         }
1679
1680         /* allocate and initialize hcd */
1681         hcd = usb_create_hcd(&sl811h_hc_driver, &dev->dev, dev_name(&dev->dev));
1682         if (!hcd) {
1683                 retval = -ENOMEM;
1684                 goto err5;
1685         }
1686         hcd->rsrc_start = addr->start;
1687         sl811 = hcd_to_sl811(hcd);
1688
1689         spin_lock_init(&sl811->lock);
1690         INIT_LIST_HEAD(&sl811->async);
1691         sl811->board = dev->dev.platform_data;
1692         init_timer(&sl811->timer);
1693         sl811->timer.function = sl811h_timer;
1694         sl811->timer.data = (unsigned long) sl811;
1695         sl811->addr_reg = addr_reg;
1696         sl811->data_reg = data_reg;
1697
1698         spin_lock_irq(&sl811->lock);
1699         port_power(sl811, 0);
1700         spin_unlock_irq(&sl811->lock);
1701         msleep(200);
1702
1703         tmp = sl811_read(sl811, SL11H_HWREVREG);
1704         switch (tmp >> 4) {
1705         case 1:
1706                 hcd->product_desc = "SL811HS v1.2";
1707                 break;
1708         case 2:
1709                 hcd->product_desc = "SL811HS v1.5";
1710                 break;
1711         default:
1712                 /* reject case 0, SL11S is less functional */
1713                 DBG("chiprev %02x\n", tmp);
1714                 retval = -ENXIO;
1715                 goto err6;
1716         }
1717
1718         /* The chip's IRQ is level triggered, active high.  A requirement
1719          * for platform device setup is to cope with things like signal
1720          * inverters (e.g. CF is active low) or working only with edge
1721          * triggers (e.g. most ARM CPUs).  Initial driver stress testing
1722          * was on a system with single edge triggering, so most sorts of
1723          * triggering arrangement should work.
1724          *
1725          * Use resource IRQ flags if set by platform device setup.
1726          */
1727         irqflags |= IRQF_SHARED;
1728         retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | irqflags);
1729         if (retval != 0)
1730                 goto err6;
1731
1732         create_debug_file(sl811);
1733         return retval;
1734
1735  err6:
1736         usb_put_hcd(hcd);
1737  err5:
1738         if (!ioaddr)
1739                 iounmap(data_reg);
1740  err4:
1741         if (!ioaddr)
1742                 iounmap(addr_reg);
1743  err2:
1744         DBG("init error, %d\n", retval);
1745         return retval;
1746 }
1747
1748 #ifdef  CONFIG_PM
1749
1750 /* for this device there's no useful distinction between the controller
1751  * and its root hub, except that the root hub only gets direct PM calls
1752  * when CONFIG_USB_SUSPEND is enabled.
1753  */
1754
1755 static int
1756 sl811h_suspend(struct platform_device *dev, pm_message_t state)
1757 {
1758         struct usb_hcd  *hcd = platform_get_drvdata(dev);
1759         struct sl811    *sl811 = hcd_to_sl811(hcd);
1760         int             retval = 0;
1761
1762         switch (state.event) {
1763         case PM_EVENT_FREEZE:
1764                 retval = sl811h_bus_suspend(hcd);
1765                 break;
1766         case PM_EVENT_SUSPEND:
1767         case PM_EVENT_HIBERNATE:
1768         case PM_EVENT_PRETHAW:          /* explicitly discard hw state */
1769                 port_power(sl811, 0);
1770                 break;
1771         }
1772         return retval;
1773 }
1774
1775 static int
1776 sl811h_resume(struct platform_device *dev)
1777 {
1778         struct usb_hcd  *hcd = platform_get_drvdata(dev);
1779         struct sl811    *sl811 = hcd_to_sl811(hcd);
1780
1781         /* with no "check to see if VBUS is still powered" board hook,
1782          * let's assume it'd only be powered to enable remote wakeup.
1783          */
1784         if (!sl811->port1 || !device_can_wakeup(&hcd->self.root_hub->dev)) {
1785                 sl811->port1 = 0;
1786                 port_power(sl811, 1);
1787                 usb_root_hub_lost_power(hcd->self.root_hub);
1788                 return 0;
1789         }
1790
1791         return sl811h_bus_resume(hcd);
1792 }
1793
1794 #else
1795
1796 #define sl811h_suspend  NULL
1797 #define sl811h_resume   NULL
1798
1799 #endif
1800
1801
1802 /* this driver is exported so sl811_cs can depend on it */
1803 struct platform_driver sl811h_driver = {
1804         .probe =        sl811h_probe,
1805         .remove =       __devexit_p(sl811h_remove),
1806
1807         .suspend =      sl811h_suspend,
1808         .resume =       sl811h_resume,
1809         .driver = {
1810                 .name = (char *) hcd_name,
1811                 .owner = THIS_MODULE,
1812         },
1813 };
1814 EXPORT_SYMBOL(sl811h_driver);
1815
1816 /*-------------------------------------------------------------------------*/
1817
1818 static int __init sl811h_init(void)
1819 {
1820         if (usb_disabled())
1821                 return -ENODEV;
1822
1823         INFO("driver %s, %s\n", hcd_name, DRIVER_VERSION);
1824         return platform_driver_register(&sl811h_driver);
1825 }
1826 module_init(sl811h_init);
1827
1828 static void __exit sl811h_cleanup(void)
1829 {
1830         platform_driver_unregister(&sl811h_driver);
1831 }
1832 module_exit(sl811h_cleanup);