Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[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/config.h>
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/smp_lock.h>
43 #include <linux/errno.h>
44 #include <linux/init.h>
45 #include <linux/timer.h>
46 #include <linux/list.h>
47 #include <linux/interrupt.h>
48 #include <linux/usb.h>
49 #include <linux/usb/sl811.h>
50 #include <linux/platform_device.h>
51
52 #include <asm/io.h>
53 #include <asm/irq.h>
54 #include <asm/system.h>
55 #include <asm/byteorder.h>
56
57 #include "../core/hcd.h"
58 #include "sl811.h"
59
60
61 MODULE_DESCRIPTION("SL811HS USB Host Controller Driver");
62 MODULE_LICENSE("GPL");
63
64 #define DRIVER_VERSION  "19 May 2005"
65
66
67 #ifndef DEBUG
68 #       define  STUB_DEBUG_FILE
69 #endif
70
71 /* for now, use only one transfer register bank */
72 #undef  USE_B
73
74 /* this doesn't understand urb->iso_frame_desc[], but if you had a driver
75  * that just queued one ISO frame per URB then iso transfers "should" work
76  * using the normal urb status fields.
77  */
78 #define DISABLE_ISO
79
80 // #define      QUIRK2
81 #define QUIRK3
82
83 static const char hcd_name[] = "sl811-hcd";
84
85 /*-------------------------------------------------------------------------*/
86
87 static void port_power(struct sl811 *sl811, int is_on)
88 {
89         struct usb_hcd  *hcd = sl811_to_hcd(sl811);
90
91         /* hub is inactive unless the port is powered */
92         if (is_on) {
93                 if (sl811->port1 & (1 << USB_PORT_FEAT_POWER))
94                         return;
95
96                 sl811->port1 = (1 << USB_PORT_FEAT_POWER);
97                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
98                 hcd->self.controller->power.power_state = PMSG_ON;
99         } else {
100                 sl811->port1 = 0;
101                 sl811->irq_enable = 0;
102                 hcd->state = HC_STATE_HALT;
103                 hcd->self.controller->power.power_state = PMSG_SUSPEND;
104         }
105         sl811->ctrl1 = 0;
106         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
107         sl811_write(sl811, SL11H_IRQ_STATUS, ~0);
108
109         if (sl811->board && sl811->board->port_power) {
110                 /* switch VBUS, at 500mA unless hub power budget gets set */
111                 DBG("power %s\n", is_on ? "on" : "off");
112                 sl811->board->port_power(hcd->self.controller, is_on);
113         }
114
115         /* reset as thoroughly as we can */
116         if (sl811->board && sl811->board->reset)
117                 sl811->board->reset(hcd->self.controller);
118         else {
119                 sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0);
120                 mdelay(20);
121         }
122
123         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
124         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
125         sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT);
126         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
127
128         // if !is_on, put into lowpower mode now
129 }
130
131 /*-------------------------------------------------------------------------*/
132
133 /* This is a PIO-only HCD.  Queueing appends URBs to the endpoint's queue,
134  * and may start I/O.  Endpoint queues are scanned during completion irq
135  * handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation.
136  *
137  * Using an external DMA engine to copy a packet at a time could work,
138  * though setup/teardown costs may be too big to make it worthwhile.
139  */
140
141 /* SETUP starts a new control request.  Devices are not allowed to
142  * STALL or NAK these; they must cancel any pending control requests.
143  */
144 static void setup_packet(
145         struct sl811            *sl811,
146         struct sl811h_ep        *ep,
147         struct urb              *urb,
148         u8                      bank,
149         u8                      control
150 )
151 {
152         u8                      addr;
153         u8                      len;
154         void __iomem            *data_reg;
155
156         addr = SL811HS_PACKET_BUF(bank == 0);
157         len = sizeof(struct usb_ctrlrequest);
158         data_reg = sl811->data_reg;
159         sl811_write_buf(sl811, addr, urb->setup_packet, len);
160
161         /* autoincrementing */
162         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
163         writeb(len, data_reg);
164         writeb(SL_SETUP /* | ep->epnum */, data_reg);
165         writeb(usb_pipedevice(urb->pipe), data_reg);
166
167         /* always OUT/data0 */ ;
168         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
169                         control | SL11H_HCTLMASK_OUT);
170         ep->length = 0;
171         PACKET("SETUP qh%p\n", ep);
172 }
173
174 /* STATUS finishes control requests, often after IN or OUT data packets */
175 static void status_packet(
176         struct sl811            *sl811,
177         struct sl811h_ep        *ep,
178         struct urb              *urb,
179         u8                      bank,
180         u8                      control
181 )
182 {
183         int                     do_out;
184         void __iomem            *data_reg;
185
186         do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe);
187         data_reg = sl811->data_reg;
188
189         /* autoincrementing */
190         sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
191         writeb(0, data_reg);
192         writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg);
193         writeb(usb_pipedevice(urb->pipe), data_reg);
194
195         /* always data1; sometimes IN */
196         control |= SL11H_HCTLMASK_TOGGLE;
197         if (do_out)
198                 control |= SL11H_HCTLMASK_OUT;
199         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
200         ep->length = 0;
201         PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "",
202                         do_out ? "out" : "in", ep);
203 }
204
205 /* IN packets can be used with any type of endpoint. here we just
206  * start the transfer, data from the peripheral may arrive later.
207  * urb->iso_frame_desc is currently ignored here...
208  */
209 static void in_packet(
210         struct sl811            *sl811,
211         struct sl811h_ep        *ep,
212         struct urb              *urb,
213         u8                      bank,
214         u8                      control
215 )
216 {
217         u8                      addr;
218         u8                      len;
219         void __iomem            *data_reg;
220
221         /* avoid losing data on overflow */
222         len = ep->maxpacket;
223         addr = SL811HS_PACKET_BUF(bank == 0);
224         if (!(control & SL11H_HCTLMASK_ISOCH)
225                         && usb_gettoggle(urb->dev, ep->epnum, 0))
226                 control |= SL11H_HCTLMASK_TOGGLE;
227         data_reg = sl811->data_reg;
228
229         /* autoincrementing */
230         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
231         writeb(len, data_reg);
232         writeb(SL_IN | ep->epnum, data_reg);
233         writeb(usb_pipedevice(urb->pipe), data_reg);
234
235         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
236         ep->length = min((int)len,
237                         urb->transfer_buffer_length - urb->actual_length);
238         PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
239                         !!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
240 }
241
242 /* OUT packets can be used with any type of endpoint.
243  * urb->iso_frame_desc is currently ignored here...
244  */
245 static void out_packet(
246         struct sl811            *sl811,
247         struct sl811h_ep        *ep,
248         struct urb              *urb,
249         u8                      bank,
250         u8                      control
251 )
252 {
253         void                    *buf;
254         u8                      addr;
255         u8                      len;
256         void __iomem            *data_reg;
257
258         buf = urb->transfer_buffer + urb->actual_length;
259         prefetch(buf);
260
261         len = min((int)ep->maxpacket,
262                         urb->transfer_buffer_length - urb->actual_length);
263
264         if (!(control & SL11H_HCTLMASK_ISOCH)
265                         && usb_gettoggle(urb->dev, ep->epnum, 1))
266                 control |= SL11H_HCTLMASK_TOGGLE;
267         addr = SL811HS_PACKET_BUF(bank == 0);
268         data_reg = sl811->data_reg;
269
270         sl811_write_buf(sl811, addr, buf, len);
271
272         /* autoincrementing */
273         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
274         writeb(len, data_reg);
275         writeb(SL_OUT | ep->epnum, data_reg);
276         writeb(usb_pipedevice(urb->pipe), data_reg);
277
278         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
279                         control | SL11H_HCTLMASK_OUT);
280         ep->length = len;
281         PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
282                         !!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len);
283 }
284
285 /*-------------------------------------------------------------------------*/
286
287 /* caller updates on-chip enables later */
288
289 static inline void sofirq_on(struct sl811 *sl811)
290 {
291         if (sl811->irq_enable & SL11H_INTMASK_SOFINTR)
292                 return;
293         VDBG("sof irq on\n");
294         sl811->irq_enable |= SL11H_INTMASK_SOFINTR;
295 }
296
297 static inline void sofirq_off(struct sl811 *sl811)
298 {
299         if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR))
300                 return;
301         VDBG("sof irq off\n");
302         sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR;
303 }
304
305 /*-------------------------------------------------------------------------*/
306
307 /* pick the next endpoint for a transaction, and issue it.
308  * frames start with periodic transfers (after whatever is pending
309  * from the previous frame), and the rest of the time is async
310  * transfers, scheduled round-robin.
311  */
312 static struct sl811h_ep *start(struct sl811 *sl811, u8 bank)
313 {
314         struct sl811h_ep        *ep;
315         struct urb              *urb;
316         int                     fclock;
317         u8                      control;
318
319         /* use endpoint at schedule head */
320         if (sl811->next_periodic) {
321                 ep = sl811->next_periodic;
322                 sl811->next_periodic = ep->next;
323         } else {
324                 if (sl811->next_async)
325                         ep = sl811->next_async;
326                 else if (!list_empty(&sl811->async))
327                         ep = container_of(sl811->async.next,
328                                         struct sl811h_ep, schedule);
329                 else {
330                         /* could set up the first fullspeed periodic
331                          * transfer for the next frame ...
332                          */
333                         return NULL;
334                 }
335
336 #ifdef USE_B
337                 if ((bank && sl811->active_b == ep) || sl811->active_a == ep)
338                         return NULL;
339 #endif
340
341                 if (ep->schedule.next == &sl811->async)
342                         sl811->next_async = NULL;
343                 else
344                         sl811->next_async = container_of(ep->schedule.next,
345                                         struct sl811h_ep, schedule);
346         }
347
348         if (unlikely(list_empty(&ep->hep->urb_list))) {
349                 DBG("empty %p queue?\n", ep);
350                 return NULL;
351         }
352
353         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
354         control = ep->defctrl;
355
356         /* if this frame doesn't have enough time left to transfer this
357          * packet, wait till the next frame.  too-simple algorithm...
358          */
359         fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6;
360         fclock -= 100;          /* setup takes not much time */
361         if (urb->dev->speed == USB_SPEED_LOW) {
362                 if (control & SL11H_HCTLMASK_PREAMBLE) {
363                         /* also note erratum 1: some hubs won't work */
364                         fclock -= 800;
365                 }
366                 fclock -= ep->maxpacket << 8;
367
368                 /* erratum 2: AFTERSOF only works for fullspeed */
369                 if (fclock < 0) {
370                         if (ep->period)
371                                 sl811->stat_overrun++;
372                         sofirq_on(sl811);
373                         return NULL;
374                 }
375         } else {
376                 fclock -= 12000 / 19;   /* 19 64byte packets/msec */
377                 if (fclock < 0) {
378                         if (ep->period)
379                                 sl811->stat_overrun++;
380                         control |= SL11H_HCTLMASK_AFTERSOF;
381
382                 /* throttle bulk/control irq noise */
383                 } else if (ep->nak_count)
384                         control |= SL11H_HCTLMASK_AFTERSOF;
385         }
386
387
388         switch (ep->nextpid) {
389         case USB_PID_IN:
390                 in_packet(sl811, ep, urb, bank, control);
391                 break;
392         case USB_PID_OUT:
393                 out_packet(sl811, ep, urb, bank, control);
394                 break;
395         case USB_PID_SETUP:
396                 setup_packet(sl811, ep, urb, bank, control);
397                 break;
398         case USB_PID_ACK:               /* for control status */
399                 status_packet(sl811, ep, urb, bank, control);
400                 break;
401         default:
402                 DBG("bad ep%p pid %02x\n", ep, ep->nextpid);
403                 ep = NULL;
404         }
405         return ep;
406 }
407
408 #define MIN_JIFFIES     ((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2)
409
410 static inline void start_transfer(struct sl811 *sl811)
411 {
412         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
413                 return;
414         if (sl811->active_a == NULL) {
415                 sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
416                 if (sl811->active_a != NULL)
417                         sl811->jiffies_a = jiffies + MIN_JIFFIES;
418         }
419 #ifdef USE_B
420         if (sl811->active_b == NULL) {
421                 sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
422                 if (sl811->active_b != NULL)
423                         sl811->jiffies_b = jiffies + MIN_JIFFIES;
424         }
425 #endif
426 }
427
428 static void finish_request(
429         struct sl811            *sl811,
430         struct sl811h_ep        *ep,
431         struct urb              *urb,
432         struct pt_regs          *regs,
433         int                     status
434 ) __releases(sl811->lock) __acquires(sl811->lock)
435 {
436         unsigned                i;
437
438         if (usb_pipecontrol(urb->pipe))
439                 ep->nextpid = USB_PID_SETUP;
440
441         spin_lock(&urb->lock);
442         if (urb->status == -EINPROGRESS)
443                 urb->status = status;
444         urb->hcpriv = NULL;
445         spin_unlock(&urb->lock);
446
447         spin_unlock(&sl811->lock);
448         usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, regs);
449         spin_lock(&sl811->lock);
450
451         /* leave active endpoints in the schedule */
452         if (!list_empty(&ep->hep->urb_list))
453                 return;
454
455         /* async deschedule? */
456         if (!list_empty(&ep->schedule)) {
457                 list_del_init(&ep->schedule);
458                 if (ep == sl811->next_async)
459                         sl811->next_async = NULL;
460                 return;
461         }
462
463         /* periodic deschedule */
464         DBG("deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
465         for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
466                 struct sl811h_ep        *temp;
467                 struct sl811h_ep        **prev = &sl811->periodic[i];
468
469                 while (*prev && ((temp = *prev) != ep))
470                         prev = &temp->next;
471                 if (*prev)
472                         *prev = ep->next;
473                 sl811->load[i] -= ep->load;
474         }
475         ep->branch = PERIODIC_SIZE;
476         sl811->periodic_count--;
477         sl811_to_hcd(sl811)->self.bandwidth_allocated
478                 -= ep->load / ep->period;
479         if (ep == sl811->next_periodic)
480                 sl811->next_periodic = ep->next;
481
482         /* we might turn SOFs back on again for the async schedule */
483         if (sl811->periodic_count == 0)
484                 sofirq_off(sl811);
485 }
486
487 static void
488 done(struct sl811 *sl811, struct sl811h_ep *ep, u8 bank, struct pt_regs *regs)
489 {
490         u8                      status;
491         struct urb              *urb;
492         int                     urbstat = -EINPROGRESS;
493
494         if (unlikely(!ep))
495                 return;
496
497         status = sl811_read(sl811, bank + SL11H_PKTSTATREG);
498
499         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
500
501         /* we can safely ignore NAKs */
502         if (status & SL11H_STATMASK_NAK) {
503                 // PACKET("...NAK_%02x qh%p\n", bank, ep);
504                 if (!ep->period)
505                         ep->nak_count++;
506                 ep->error_count = 0;
507
508         /* ACK advances transfer, toggle, and maybe queue */
509         } else if (status & SL11H_STATMASK_ACK) {
510                 struct usb_device       *udev = urb->dev;
511                 int                     len;
512                 unsigned char           *buf;
513
514                 /* urb->iso_frame_desc is currently ignored here... */
515
516                 ep->nak_count = ep->error_count = 0;
517                 switch (ep->nextpid) {
518                 case USB_PID_OUT:
519                         // PACKET("...ACK/out_%02x qh%p\n", bank, ep);
520                         urb->actual_length += ep->length;
521                         usb_dotoggle(udev, ep->epnum, 1);
522                         if (urb->actual_length
523                                         == urb->transfer_buffer_length) {
524                                 if (usb_pipecontrol(urb->pipe))
525                                         ep->nextpid = USB_PID_ACK;
526
527                                 /* some bulk protocols terminate OUT transfers
528                                  * by a short packet, using ZLPs not padding.
529                                  */
530                                 else if (ep->length < ep->maxpacket
531                                                 || !(urb->transfer_flags
532                                                         & URB_ZERO_PACKET))
533                                         urbstat = 0;
534                         }
535                         break;
536                 case USB_PID_IN:
537                         // PACKET("...ACK/in_%02x qh%p\n", bank, ep);
538                         buf = urb->transfer_buffer + urb->actual_length;
539                         prefetchw(buf);
540                         len = ep->maxpacket - sl811_read(sl811,
541                                                 bank + SL11H_XFERCNTREG);
542                         if (len > ep->length) {
543                                 len = ep->length;
544                                 urb->status = -EOVERFLOW;
545                         }
546                         urb->actual_length += len;
547                         sl811_read_buf(sl811, SL811HS_PACKET_BUF(bank == 0),
548                                         buf, len);
549                         usb_dotoggle(udev, ep->epnum, 0);
550                         if (urb->actual_length == urb->transfer_buffer_length)
551                                 urbstat = 0;
552                         else if (len < ep->maxpacket) {
553                                 if (urb->transfer_flags & URB_SHORT_NOT_OK)
554                                         urbstat = -EREMOTEIO;
555                                 else
556                                         urbstat = 0;
557                         }
558                         if (usb_pipecontrol(urb->pipe)
559                                         && (urbstat == -EREMOTEIO
560                                                 || urbstat == 0)) {
561
562                                 /* NOTE if the status stage STALLs (why?),
563                                  * this reports the wrong urb status.
564                                  */
565                                 spin_lock(&urb->lock);
566                                 if (urb->status == -EINPROGRESS)
567                                         urb->status = urbstat;
568                                 spin_unlock(&urb->lock);
569
570                                 urb = NULL;
571                                 ep->nextpid = USB_PID_ACK;
572                         }
573                         break;
574                 case USB_PID_SETUP:
575                         // PACKET("...ACK/setup_%02x qh%p\n", bank, ep);
576                         if (urb->transfer_buffer_length == urb->actual_length)
577                                 ep->nextpid = USB_PID_ACK;
578                         else if (usb_pipeout(urb->pipe)) {
579                                 usb_settoggle(udev, 0, 1, 1);
580                                 ep->nextpid = USB_PID_OUT;
581                         } else {
582                                 usb_settoggle(udev, 0, 0, 1);
583                                 ep->nextpid = USB_PID_IN;
584                         }
585                         break;
586                 case USB_PID_ACK:
587                         // PACKET("...ACK/status_%02x qh%p\n", bank, ep);
588                         urbstat = 0;
589                         break;
590                 }
591
592         /* STALL stops all transfers */
593         } else if (status & SL11H_STATMASK_STALL) {
594                 PACKET("...STALL_%02x qh%p\n", bank, ep);
595                 ep->nak_count = ep->error_count = 0;
596                 urbstat = -EPIPE;
597
598         /* error? retry, until "3 strikes" */
599         } else if (++ep->error_count >= 3) {
600                 if (status & SL11H_STATMASK_TMOUT)
601                         urbstat = -ETIMEDOUT;
602                 else if (status & SL11H_STATMASK_OVF)
603                         urbstat = -EOVERFLOW;
604                 else
605                         urbstat = -EPROTO;
606                 ep->error_count = 0;
607                 PACKET("...3STRIKES_%02x %02x qh%p stat %d\n",
608                                 bank, status, ep, urbstat);
609         }
610
611         if (urb && (urbstat != -EINPROGRESS || urb->status != -EINPROGRESS))
612                 finish_request(sl811, ep, urb, regs, urbstat);
613 }
614
615 static inline u8 checkdone(struct sl811 *sl811)
616 {
617         u8      ctl;
618         u8      irqstat = 0;
619
620         if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) {
621                 ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG));
622                 if (ctl & SL11H_HCTLMASK_ARM)
623                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
624                 DBG("%s DONE_A: ctrl %02x sts %02x\n",
625                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
626                         ctl,
627                         sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
628                 irqstat |= SL11H_INTMASK_DONE_A;
629         }
630 #ifdef  USE_B
631         if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) {
632                 ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG));
633                 if (ctl & SL11H_HCTLMASK_ARM)
634                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
635                 DBG("%s DONE_B: ctrl %02x sts %02x\n",
636                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
637                         ctl,
638                         sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
639                 irqstat |= SL11H_INTMASK_DONE_A;
640         }
641 #endif
642         return irqstat;
643 }
644
645 static irqreturn_t sl811h_irq(struct usb_hcd *hcd, struct pt_regs *regs)
646 {
647         struct sl811    *sl811 = hcd_to_sl811(hcd);
648         u8              irqstat;
649         irqreturn_t     ret = IRQ_NONE;
650         unsigned        retries = 5;
651
652         spin_lock(&sl811->lock);
653
654 retry:
655         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS) & ~SL11H_INTMASK_DP;
656         if (irqstat) {
657                 sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
658                 irqstat &= sl811->irq_enable;
659         }
660
661 #ifdef  QUIRK2
662         /* this may no longer be necessary ... */
663         if (irqstat == 0) {
664                 irqstat = checkdone(sl811);
665                 if (irqstat)
666                         sl811->stat_lost++;
667         }
668 #endif
669
670         /* USB packets, not necessarily handled in the order they're
671          * issued ... that's fine if they're different endpoints.
672          */
673         if (irqstat & SL11H_INTMASK_DONE_A) {
674                 done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF), regs);
675                 sl811->active_a = NULL;
676                 sl811->stat_a++;
677         }
678 #ifdef USE_B
679         if (irqstat & SL11H_INTMASK_DONE_B) {
680                 done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF), regs);
681                 sl811->active_b = NULL;
682                 sl811->stat_b++;
683         }
684 #endif
685         if (irqstat & SL11H_INTMASK_SOFINTR) {
686                 unsigned index;
687
688                 index = sl811->frame++ % (PERIODIC_SIZE - 1);
689                 sl811->stat_sof++;
690
691                 /* be graceful about almost-inevitable periodic schedule
692                  * overruns:  continue the previous frame's transfers iff
693                  * this one has nothing scheduled.
694                  */
695                 if (sl811->next_periodic) {
696                         // ERR("overrun to slot %d\n", index);
697                         sl811->stat_overrun++;
698                 }
699                 if (sl811->periodic[index])
700                         sl811->next_periodic = sl811->periodic[index];
701         }
702
703         /* khubd manages debouncing and wakeup */
704         if (irqstat & SL11H_INTMASK_INSRMV) {
705                 sl811->stat_insrmv++;
706
707                 /* most stats are reset for each VBUS session */
708                 sl811->stat_wake = 0;
709                 sl811->stat_sof = 0;
710                 sl811->stat_a = 0;
711                 sl811->stat_b = 0;
712                 sl811->stat_lost = 0;
713
714                 sl811->ctrl1 = 0;
715                 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
716
717                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
718                 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
719
720                 /* usbcore nukes other pending transactions on disconnect */
721                 if (sl811->active_a) {
722                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
723                         finish_request(sl811, sl811->active_a,
724                                 container_of(sl811->active_a
725                                                 ->hep->urb_list.next,
726                                         struct urb, urb_list),
727                                 NULL, -ESHUTDOWN);
728                         sl811->active_a = NULL;
729                 }
730 #ifdef  USE_B
731                 if (sl811->active_b) {
732                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
733                         finish_request(sl811, sl811->active_b,
734                                 container_of(sl811->active_b
735                                                 ->hep->urb_list.next,
736                                         struct urb, urb_list),
737                                 NULL, -ESHUTDOWN);
738                         sl811->active_b = NULL;
739                 }
740 #endif
741
742                 /* port status seems weird until after reset, so
743                  * force the reset and make khubd clean up later.
744                  */
745                 sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
746                                 | (1 << USB_PORT_FEAT_CONNECTION);
747
748         } else if (irqstat & SL11H_INTMASK_RD) {
749                 if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)) {
750                         DBG("wakeup\n");
751                         sl811->port1 |= 1 << USB_PORT_FEAT_C_SUSPEND;
752                         sl811->stat_wake++;
753                 } else
754                         irqstat &= ~SL11H_INTMASK_RD;
755         }
756
757         if (irqstat) {
758                 if (sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
759                         start_transfer(sl811);
760                 ret = IRQ_HANDLED;
761                 if (retries--)
762                         goto retry;
763         }
764
765         if (sl811->periodic_count == 0 && list_empty(&sl811->async))
766                 sofirq_off(sl811);
767         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
768
769         spin_unlock(&sl811->lock);
770
771         return ret;
772 }
773
774 /*-------------------------------------------------------------------------*/
775
776 /* usb 1.1 says max 90% of a frame is available for periodic transfers.
777  * this driver doesn't promise that much since it's got to handle an
778  * IRQ per packet; irq handling latencies also use up that time.
779  *
780  * NOTE:  the periodic schedule is a sparse tree, with the load for
781  * each branch minimized.  see fig 3.5 in the OHCI spec for example.
782  */
783 #define MAX_PERIODIC_LOAD       500     /* out of 1000 usec */
784
785 static int balance(struct sl811 *sl811, u16 period, u16 load)
786 {
787         int     i, branch = -ENOSPC;
788
789         /* search for the least loaded schedule branch of that period
790          * which has enough bandwidth left unreserved.
791          */
792         for (i = 0; i < period ; i++) {
793                 if (branch < 0 || sl811->load[branch] > sl811->load[i]) {
794                         int     j;
795
796                         for (j = i; j < PERIODIC_SIZE; j += period) {
797                                 if ((sl811->load[j] + load)
798                                                 > MAX_PERIODIC_LOAD)
799                                         break;
800                         }
801                         if (j < PERIODIC_SIZE)
802                                 continue;
803                         branch = i;
804                 }
805         }
806         return branch;
807 }
808
809 /*-------------------------------------------------------------------------*/
810
811 static int sl811h_urb_enqueue(
812         struct usb_hcd          *hcd,
813         struct usb_host_endpoint *hep,
814         struct urb              *urb,
815         gfp_t                   mem_flags
816 ) {
817         struct sl811            *sl811 = hcd_to_sl811(hcd);
818         struct usb_device       *udev = urb->dev;
819         unsigned int            pipe = urb->pipe;
820         int                     is_out = !usb_pipein(pipe);
821         int                     type = usb_pipetype(pipe);
822         int                     epnum = usb_pipeendpoint(pipe);
823         struct sl811h_ep        *ep = NULL;
824         unsigned long           flags;
825         int                     i;
826         int                     retval = 0;
827
828 #ifdef  DISABLE_ISO
829         if (type == PIPE_ISOCHRONOUS)
830                 return -ENOSPC;
831 #endif
832
833         /* avoid all allocations within spinlocks */
834         if (!hep->hcpriv)
835                 ep = kzalloc(sizeof *ep, mem_flags);
836
837         spin_lock_irqsave(&sl811->lock, flags);
838
839         /* don't submit to a dead or disabled port */
840         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
841                         || !HC_IS_RUNNING(hcd->state)) {
842                 retval = -ENODEV;
843                 kfree(ep);
844                 goto fail;
845         }
846
847         if (hep->hcpriv) {
848                 kfree(ep);
849                 ep = hep->hcpriv;
850         } else if (!ep) {
851                 retval = -ENOMEM;
852                 goto fail;
853
854         } else {
855                 INIT_LIST_HEAD(&ep->schedule);
856                 ep->udev = udev;
857                 ep->epnum = epnum;
858                 ep->maxpacket = usb_maxpacket(udev, urb->pipe, is_out);
859                 ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE;
860                 usb_settoggle(udev, epnum, is_out, 0);
861
862                 if (type == PIPE_CONTROL)
863                         ep->nextpid = USB_PID_SETUP;
864                 else if (is_out)
865                         ep->nextpid = USB_PID_OUT;
866                 else
867                         ep->nextpid = USB_PID_IN;
868
869                 if (ep->maxpacket > H_MAXPACKET) {
870                         /* iso packets up to 240 bytes could work... */
871                         DBG("dev %d ep%d maxpacket %d\n",
872                                 udev->devnum, epnum, ep->maxpacket);
873                         retval = -EINVAL;
874                         goto fail;
875                 }
876
877                 if (udev->speed == USB_SPEED_LOW) {
878                         /* send preamble for external hub? */
879                         if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD))
880                                 ep->defctrl |= SL11H_HCTLMASK_PREAMBLE;
881                 }
882                 switch (type) {
883                 case PIPE_ISOCHRONOUS:
884                 case PIPE_INTERRUPT:
885                         if (urb->interval > PERIODIC_SIZE)
886                                 urb->interval = PERIODIC_SIZE;
887                         ep->period = urb->interval;
888                         ep->branch = PERIODIC_SIZE;
889                         if (type == PIPE_ISOCHRONOUS)
890                                 ep->defctrl |= SL11H_HCTLMASK_ISOCH;
891                         ep->load = usb_calc_bus_time(udev->speed, !is_out,
892                                 (type == PIPE_ISOCHRONOUS),
893                                 usb_maxpacket(udev, pipe, is_out))
894                                         / 1000;
895                         break;
896                 }
897
898                 ep->hep = hep;
899                 hep->hcpriv = ep;
900         }
901
902         /* maybe put endpoint into schedule */
903         switch (type) {
904         case PIPE_CONTROL:
905         case PIPE_BULK:
906                 if (list_empty(&ep->schedule))
907                         list_add_tail(&ep->schedule, &sl811->async);
908                 break;
909         case PIPE_ISOCHRONOUS:
910         case PIPE_INTERRUPT:
911                 urb->interval = ep->period;
912                 if (ep->branch < PERIODIC_SIZE) {
913                         /* NOTE:  the phase is correct here, but the value
914                          * needs offsetting by the transfer queue depth.
915                          * All current drivers ignore start_frame, so this
916                          * is unlikely to ever matter...
917                          */
918                         urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
919                                                 + ep->branch;
920                         break;
921                 }
922
923                 retval = balance(sl811, ep->period, ep->load);
924                 if (retval < 0)
925                         goto fail;
926                 ep->branch = retval;
927                 retval = 0;
928                 urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
929                                         + ep->branch;
930
931                 /* sort each schedule branch by period (slow before fast)
932                  * to share the faster parts of the tree without needing
933                  * dummy/placeholder nodes
934                  */
935                 DBG("schedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
936                 for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
937                         struct sl811h_ep        **prev = &sl811->periodic[i];
938                         struct sl811h_ep        *here = *prev;
939
940                         while (here && ep != here) {
941                                 if (ep->period > here->period)
942                                         break;
943                                 prev = &here->next;
944                                 here = *prev;
945                         }
946                         if (ep != here) {
947                                 ep->next = here;
948                                 *prev = ep;
949                         }
950                         sl811->load[i] += ep->load;
951                 }
952                 sl811->periodic_count++;
953                 hcd->self.bandwidth_allocated += ep->load / ep->period;
954                 sofirq_on(sl811);
955         }
956
957         /* in case of unlink-during-submit */
958         spin_lock(&urb->lock);
959         if (urb->status != -EINPROGRESS) {
960                 spin_unlock(&urb->lock);
961                 finish_request(sl811, ep, urb, NULL, 0);
962                 retval = 0;
963                 goto fail;
964         }
965         urb->hcpriv = hep;
966         spin_unlock(&urb->lock);
967
968         start_transfer(sl811);
969         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
970 fail:
971         spin_unlock_irqrestore(&sl811->lock, flags);
972         return retval;
973 }
974
975 static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
976 {
977         struct sl811            *sl811 = hcd_to_sl811(hcd);
978         struct usb_host_endpoint *hep;
979         unsigned long           flags;
980         struct sl811h_ep        *ep;
981         int                     retval = 0;
982
983         spin_lock_irqsave(&sl811->lock, flags);
984         hep = urb->hcpriv;
985         if (!hep)
986                 goto fail;
987
988         ep = hep->hcpriv;
989         if (ep) {
990                 /* finish right away if this urb can't be active ...
991                  * note that some drivers wrongly expect delays
992                  */
993                 if (ep->hep->urb_list.next != &urb->urb_list) {
994                         /* not front of queue?  never active */
995
996                 /* for active transfers, we expect an IRQ */
997                 } else if (sl811->active_a == ep) {
998                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
999                                 /* happens a lot with lowspeed?? */
1000                                 DBG("giveup on DONE_A: ctrl %02x sts %02x\n",
1001                                         sl811_read(sl811,
1002                                                 SL811_EP_A(SL11H_HOSTCTLREG)),
1003                                         sl811_read(sl811,
1004                                                 SL811_EP_A(SL11H_PKTSTATREG)));
1005                                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1006                                                 0);
1007                                 sl811->active_a = NULL;
1008                         } else
1009                                 urb = NULL;
1010 #ifdef  USE_B
1011                 } else if (sl811->active_b == ep) {
1012                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
1013                                 /* happens a lot with lowspeed?? */
1014                                 DBG("giveup on DONE_B: ctrl %02x sts %02x\n",
1015                                         sl811_read(sl811,
1016                                                 SL811_EP_B(SL11H_HOSTCTLREG)),
1017                                         sl811_read(sl811,
1018                                                 SL811_EP_B(SL11H_PKTSTATREG)));
1019                                 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG),
1020                                                 0);
1021                                 sl811->active_b = NULL;
1022                         } else
1023                                 urb = NULL;
1024 #endif
1025                 } else {
1026                         /* front of queue for inactive endpoint */
1027                 }
1028
1029                 if (urb)
1030                         finish_request(sl811, ep, urb, NULL, 0);
1031                 else
1032                         VDBG("dequeue, urb %p active %s; wait4irq\n", urb,
1033                                 (sl811->active_a == ep) ? "A" : "B");
1034         } else
1035 fail:
1036                 retval = -EINVAL;
1037         spin_unlock_irqrestore(&sl811->lock, flags);
1038         return retval;
1039 }
1040
1041 static void
1042 sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
1043 {
1044         struct sl811h_ep        *ep = hep->hcpriv;
1045
1046         if (!ep)
1047                 return;
1048
1049         /* assume we'd just wait for the irq */
1050         if (!list_empty(&hep->urb_list))
1051                 msleep(3);
1052         if (!list_empty(&hep->urb_list))
1053                 WARN("ep %p not empty?\n", ep);
1054
1055         kfree(ep);
1056         hep->hcpriv = NULL;
1057 }
1058
1059 static int
1060 sl811h_get_frame(struct usb_hcd *hcd)
1061 {
1062         struct sl811 *sl811 = hcd_to_sl811(hcd);
1063
1064         /* wrong except while periodic transfers are scheduled;
1065          * never matches the on-the-wire frame;
1066          * subject to overruns.
1067          */
1068         return sl811->frame;
1069 }
1070
1071
1072 /*-------------------------------------------------------------------------*/
1073
1074 /* the virtual root hub timer IRQ checks for hub status */
1075 static int
1076 sl811h_hub_status_data(struct usb_hcd *hcd, char *buf)
1077 {
1078         struct sl811 *sl811 = hcd_to_sl811(hcd);
1079 #ifdef  QUIRK3
1080         unsigned long flags;
1081
1082         /* non-SMP HACK: use root hub timer as i/o watchdog
1083          * this seems essential when SOF IRQs aren't in use...
1084          */
1085         local_irq_save(flags);
1086         if (!timer_pending(&sl811->timer)) {
1087                 if (sl811h_irq( /* ~0, */ hcd, NULL) != IRQ_NONE)
1088                         sl811->stat_lost++;
1089         }
1090         local_irq_restore(flags);
1091 #endif
1092
1093         if (!(sl811->port1 & (0xffff << 16)))
1094                 return 0;
1095
1096         /* tell khubd port 1 changed */
1097         *buf = (1 << 1);
1098         return 1;
1099 }
1100
1101 static void
1102 sl811h_hub_descriptor (
1103         struct sl811                    *sl811,
1104         struct usb_hub_descriptor       *desc
1105 ) {
1106         u16             temp = 0;
1107
1108         desc->bDescriptorType = 0x29;
1109         desc->bHubContrCurrent = 0;
1110
1111         desc->bNbrPorts = 1;
1112         desc->bDescLength = 9;
1113
1114         /* per-port power switching (gang of one!), or none */
1115         desc->bPwrOn2PwrGood = 0;
1116         if (sl811->board && sl811->board->port_power) {
1117                 desc->bPwrOn2PwrGood = sl811->board->potpg;
1118                 if (!desc->bPwrOn2PwrGood)
1119                         desc->bPwrOn2PwrGood = 10;
1120                 temp = 0x0001;
1121         } else
1122                 temp = 0x0002;
1123
1124         /* no overcurrent errors detection/handling */
1125         temp |= 0x0010;
1126
1127         desc->wHubCharacteristics = (__force __u16)cpu_to_le16(temp);
1128
1129         /* two bitmaps:  ports removable, and legacy PortPwrCtrlMask */
1130         desc->bitmap[0] = 0 << 1;
1131         desc->bitmap[1] = ~0;
1132 }
1133
1134 static void
1135 sl811h_timer(unsigned long _sl811)
1136 {
1137         struct sl811    *sl811 = (void *) _sl811;
1138         unsigned long   flags;
1139         u8              irqstat;
1140         u8              signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE;
1141         const u32       mask = (1 << USB_PORT_FEAT_CONNECTION)
1142                                 | (1 << USB_PORT_FEAT_ENABLE)
1143                                 | (1 << USB_PORT_FEAT_LOWSPEED);
1144
1145         spin_lock_irqsave(&sl811->lock, flags);
1146
1147         /* stop special signaling */
1148         sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE;
1149         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1150         udelay(3);
1151
1152         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS);
1153
1154         switch (signaling) {
1155         case SL11H_CTL1MASK_SE0:
1156                 DBG("end reset\n");
1157                 sl811->port1 = (1 << USB_PORT_FEAT_C_RESET)
1158                                 | (1 << USB_PORT_FEAT_POWER);
1159                 sl811->ctrl1 = 0;
1160                 /* don't wrongly ack RD */
1161                 if (irqstat & SL11H_INTMASK_INSRMV)
1162                         irqstat &= ~SL11H_INTMASK_RD;
1163                 break;
1164         case SL11H_CTL1MASK_K:
1165                 DBG("end resume\n");
1166                 sl811->port1 &= ~(1 << USB_PORT_FEAT_SUSPEND);
1167                 break;
1168         default:
1169                 DBG("odd timer signaling: %02x\n", signaling);
1170                 break;
1171         }
1172         sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
1173
1174         if (irqstat & SL11H_INTMASK_RD) {
1175                 /* usbcore nukes all pending transactions on disconnect */
1176                 if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION))
1177                         sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
1178                                         | (1 << USB_PORT_FEAT_C_ENABLE);
1179                 sl811->port1 &= ~mask;
1180                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
1181         } else {
1182                 sl811->port1 |= mask;
1183                 if (irqstat & SL11H_INTMASK_DP)
1184                         sl811->port1 &= ~(1 << USB_PORT_FEAT_LOWSPEED);
1185                 sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD;
1186         }
1187
1188         if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION)) {
1189                 u8      ctrl2 = SL811HS_CTL2_INIT;
1190
1191                 sl811->irq_enable |= SL11H_INTMASK_DONE_A;
1192 #ifdef USE_B
1193                 sl811->irq_enable |= SL11H_INTMASK_DONE_B;
1194 #endif
1195                 if (sl811->port1 & (1 << USB_PORT_FEAT_LOWSPEED)) {
1196                         sl811->ctrl1 |= SL11H_CTL1MASK_LSPD;
1197                         ctrl2 |= SL811HS_CTL2MASK_DSWAP;
1198                 }
1199
1200                 /* start SOFs flowing, kickstarting with A registers */
1201                 sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA;
1202                 sl811_write(sl811, SL11H_SOFLOWREG, 0xe0);
1203                 sl811_write(sl811, SL811HS_CTLREG2, ctrl2);
1204
1205                 /* autoincrementing */
1206                 sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0);
1207                 writeb(SL_SOF, sl811->data_reg);
1208                 writeb(0, sl811->data_reg);
1209                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1210                                 SL11H_HCTLMASK_ARM);
1211
1212                 /* khubd provides debounce delay */
1213         } else {
1214                 sl811->ctrl1 = 0;
1215         }
1216         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1217
1218         /* reenable irqs */
1219         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
1220         spin_unlock_irqrestore(&sl811->lock, flags);
1221 }
1222
1223 static int
1224 sl811h_hub_control(
1225         struct usb_hcd  *hcd,
1226         u16             typeReq,
1227         u16             wValue,
1228         u16             wIndex,
1229         char            *buf,
1230         u16             wLength
1231 ) {
1232         struct sl811    *sl811 = hcd_to_sl811(hcd);
1233         int             retval = 0;
1234         unsigned long   flags;
1235
1236         spin_lock_irqsave(&sl811->lock, flags);
1237
1238         switch (typeReq) {
1239         case ClearHubFeature:
1240         case SetHubFeature:
1241                 switch (wValue) {
1242                 case C_HUB_OVER_CURRENT:
1243                 case C_HUB_LOCAL_POWER:
1244                         break;
1245                 default:
1246                         goto error;
1247                 }
1248                 break;
1249         case ClearPortFeature:
1250                 if (wIndex != 1 || wLength != 0)
1251                         goto error;
1252
1253                 switch (wValue) {
1254                 case USB_PORT_FEAT_ENABLE:
1255                         sl811->port1 &= (1 << USB_PORT_FEAT_POWER);
1256                         sl811->ctrl1 = 0;
1257                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1258                         sl811->irq_enable = SL11H_INTMASK_INSRMV;
1259                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1260                                                 sl811->irq_enable);
1261                         break;
1262                 case USB_PORT_FEAT_SUSPEND:
1263                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)))
1264                                 break;
1265
1266                         /* 20 msec of resume/K signaling, other irqs blocked */
1267                         DBG("start resume...\n");
1268                         sl811->irq_enable = 0;
1269                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1270                                                 sl811->irq_enable);
1271                         sl811->ctrl1 |= SL11H_CTL1MASK_K;
1272                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1273
1274                         mod_timer(&sl811->timer, jiffies
1275                                         + msecs_to_jiffies(20));
1276                         break;
1277                 case USB_PORT_FEAT_POWER:
1278                         port_power(sl811, 0);
1279                         break;
1280                 case USB_PORT_FEAT_C_ENABLE:
1281                 case USB_PORT_FEAT_C_SUSPEND:
1282                 case USB_PORT_FEAT_C_CONNECTION:
1283                 case USB_PORT_FEAT_C_OVER_CURRENT:
1284                 case USB_PORT_FEAT_C_RESET:
1285                         break;
1286                 default:
1287                         goto error;
1288                 }
1289                 sl811->port1 &= ~(1 << wValue);
1290                 break;
1291         case GetHubDescriptor:
1292                 sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf);
1293                 break;
1294         case GetHubStatus:
1295                 *(__le32 *) buf = cpu_to_le32(0);
1296                 break;
1297         case GetPortStatus:
1298                 if (wIndex != 1)
1299                         goto error;
1300                 *(__le32 *) buf = cpu_to_le32(sl811->port1);
1301
1302 #ifndef VERBOSE
1303         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
1304 #endif
1305                 DBG("GetPortStatus %08x\n", sl811->port1);
1306                 break;
1307         case SetPortFeature:
1308                 if (wIndex != 1 || wLength != 0)
1309                         goto error;
1310                 switch (wValue) {
1311                 case USB_PORT_FEAT_SUSPEND:
1312                         if (sl811->port1 & (1 << USB_PORT_FEAT_RESET))
1313                                 goto error;
1314                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE)))
1315                                 goto error;
1316
1317                         DBG("suspend...\n");
1318                         sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA;
1319                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1320                         break;
1321                 case USB_PORT_FEAT_POWER:
1322                         port_power(sl811, 1);
1323                         break;
1324                 case USB_PORT_FEAT_RESET:
1325                         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
1326                                 goto error;
1327                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_POWER)))
1328                                 break;
1329
1330                         /* 50 msec of reset/SE0 signaling, irqs blocked */
1331                         sl811->irq_enable = 0;
1332                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1333                                                 sl811->irq_enable);
1334                         sl811->ctrl1 = SL11H_CTL1MASK_SE0;
1335                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1336                         sl811->port1 |= (1 << USB_PORT_FEAT_RESET);
1337                         mod_timer(&sl811->timer, jiffies
1338                                         + msecs_to_jiffies(50));
1339                         break;
1340                 default:
1341                         goto error;
1342                 }
1343                 sl811->port1 |= 1 << wValue;
1344                 break;
1345
1346         default:
1347 error:
1348                 /* "protocol stall" on error */
1349                 retval = -EPIPE;
1350         }
1351
1352         spin_unlock_irqrestore(&sl811->lock, flags);
1353         return retval;
1354 }
1355
1356 #ifdef  CONFIG_PM
1357
1358 static int
1359 sl811h_bus_suspend(struct usb_hcd *hcd)
1360 {
1361         // SOFs off
1362         DBG("%s\n", __FUNCTION__);
1363         return 0;
1364 }
1365
1366 static int
1367 sl811h_bus_resume(struct usb_hcd *hcd)
1368 {
1369         // SOFs on
1370         DBG("%s\n", __FUNCTION__);
1371         return 0;
1372 }
1373
1374 #else
1375
1376 #define sl811h_bus_suspend      NULL
1377 #define sl811h_bus_resume       NULL
1378
1379 #endif
1380
1381
1382 /*-------------------------------------------------------------------------*/
1383
1384 #ifdef STUB_DEBUG_FILE
1385
1386 static inline void create_debug_file(struct sl811 *sl811) { }
1387 static inline void remove_debug_file(struct sl811 *sl811) { }
1388
1389 #else
1390
1391 #include <linux/proc_fs.h>
1392 #include <linux/seq_file.h>
1393
1394 static void dump_irq(struct seq_file *s, char *label, u8 mask)
1395 {
1396         seq_printf(s, "%s %02x%s%s%s%s%s%s\n", label, mask,
1397                 (mask & SL11H_INTMASK_DONE_A) ? " done_a" : "",
1398                 (mask & SL11H_INTMASK_DONE_B) ? " done_b" : "",
1399                 (mask & SL11H_INTMASK_SOFINTR) ? " sof" : "",
1400                 (mask & SL11H_INTMASK_INSRMV) ? " ins/rmv" : "",
1401                 (mask & SL11H_INTMASK_RD) ? " rd" : "",
1402                 (mask & SL11H_INTMASK_DP) ? " dp" : "");
1403 }
1404
1405 static int proc_sl811h_show(struct seq_file *s, void *unused)
1406 {
1407         struct sl811            *sl811 = s->private;
1408         struct sl811h_ep        *ep;
1409         unsigned                i;
1410
1411         seq_printf(s, "%s\n%s version %s\nportstatus[1] = %08x\n",
1412                 sl811_to_hcd(sl811)->product_desc,
1413                 hcd_name, DRIVER_VERSION,
1414                 sl811->port1);
1415
1416         seq_printf(s, "insert/remove: %ld\n", sl811->stat_insrmv);
1417         seq_printf(s, "current session:  done_a %ld done_b %ld "
1418                         "wake %ld sof %ld overrun %ld lost %ld\n\n",
1419                 sl811->stat_a, sl811->stat_b,
1420                 sl811->stat_wake, sl811->stat_sof,
1421                 sl811->stat_overrun, sl811->stat_lost);
1422
1423         spin_lock_irq(&sl811->lock);
1424
1425         if (sl811->ctrl1 & SL11H_CTL1MASK_SUSPEND)
1426                 seq_printf(s, "(suspended)\n\n");
1427         else {
1428                 u8      t = sl811_read(sl811, SL11H_CTLREG1);
1429
1430                 seq_printf(s, "ctrl1 %02x%s%s%s%s\n", t,
1431                         (t & SL11H_CTL1MASK_SOF_ENA) ? " sofgen" : "",
1432                         ({char *s; switch (t & SL11H_CTL1MASK_FORCE) {
1433                         case SL11H_CTL1MASK_NORMAL: s = ""; break;
1434                         case SL11H_CTL1MASK_SE0: s = " se0/reset"; break;
1435                         case SL11H_CTL1MASK_K: s = " k/resume"; break;
1436                         default: s = "j"; break;
1437                         }; s; }),
1438                         (t & SL11H_CTL1MASK_LSPD) ? " lowspeed" : "",
1439                         (t & SL11H_CTL1MASK_SUSPEND) ? " suspend" : "");
1440
1441                 dump_irq(s, "irq_enable",
1442                                 sl811_read(sl811, SL11H_IRQ_ENABLE));
1443                 dump_irq(s, "irq_status",
1444                                 sl811_read(sl811, SL11H_IRQ_STATUS));
1445                 seq_printf(s, "frame clocks remaining:  %d\n",
1446                                 sl811_read(sl811, SL11H_SOFTMRREG) << 6);
1447         }
1448
1449         seq_printf(s, "A: qh%p ctl %02x sts %02x\n", sl811->active_a,
1450                 sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)),
1451                 sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
1452         seq_printf(s, "B: qh%p ctl %02x sts %02x\n", sl811->active_b,
1453                 sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)),
1454                 sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
1455         seq_printf(s, "\n");
1456         list_for_each_entry (ep, &sl811->async, schedule) {
1457                 struct urb              *urb;
1458
1459                 seq_printf(s, "%s%sqh%p, ep%d%s, maxpacket %d"
1460                                         " nak %d err %d\n",
1461                         (ep == sl811->active_a) ? "(A) " : "",
1462                         (ep == sl811->active_b) ? "(B) " : "",
1463                         ep, ep->epnum,
1464                         ({ char *s; switch (ep->nextpid) {
1465                         case USB_PID_IN: s = "in"; break;
1466                         case USB_PID_OUT: s = "out"; break;
1467                         case USB_PID_SETUP: s = "setup"; break;
1468                         case USB_PID_ACK: s = "status"; break;
1469                         default: s = "?"; break;
1470                         }; s;}),
1471                         ep->maxpacket,
1472                         ep->nak_count, ep->error_count);
1473                 list_for_each_entry (urb, &ep->hep->urb_list, urb_list) {
1474                         seq_printf(s, "  urb%p, %d/%d\n", urb,
1475                                 urb->actual_length,
1476                                 urb->transfer_buffer_length);
1477                 }
1478         }
1479         if (!list_empty(&sl811->async))
1480                 seq_printf(s, "\n");
1481
1482         seq_printf(s, "periodic size= %d\n", PERIODIC_SIZE);
1483
1484         for (i = 0; i < PERIODIC_SIZE; i++) {
1485                 ep = sl811->periodic[i];
1486                 if (!ep)
1487                         continue;
1488                 seq_printf(s, "%2d [%3d]:\n", i, sl811->load[i]);
1489
1490                 /* DUMB: prints shared entries multiple times */
1491                 do {
1492                         seq_printf(s,
1493                                 "   %s%sqh%d/%p (%sdev%d ep%d%s max %d) "
1494                                         "err %d\n",
1495                                 (ep == sl811->active_a) ? "(A) " : "",
1496                                 (ep == sl811->active_b) ? "(B) " : "",
1497                                 ep->period, ep,
1498                                 (ep->udev->speed == USB_SPEED_FULL)
1499                                         ? "" : "ls ",
1500                                 ep->udev->devnum, ep->epnum,
1501                                 (ep->epnum == 0) ? ""
1502                                         : ((ep->nextpid == USB_PID_IN)
1503                                                 ? "in"
1504                                                 : "out"),
1505                                 ep->maxpacket, ep->error_count);
1506                         ep = ep->next;
1507                 } while (ep);
1508         }
1509
1510         spin_unlock_irq(&sl811->lock);
1511         seq_printf(s, "\n");
1512
1513         return 0;
1514 }
1515
1516 static int proc_sl811h_open(struct inode *inode, struct file *file)
1517 {
1518         return single_open(file, proc_sl811h_show, PDE(inode)->data);
1519 }
1520
1521 static struct file_operations proc_ops = {
1522         .open           = proc_sl811h_open,
1523         .read           = seq_read,
1524         .llseek         = seq_lseek,
1525         .release        = single_release,
1526 };
1527
1528 /* expect just one sl811 per system */
1529 static const char proc_filename[] = "driver/sl811h";
1530
1531 static void create_debug_file(struct sl811 *sl811)
1532 {
1533         struct proc_dir_entry *pde;
1534
1535         pde = create_proc_entry(proc_filename, 0, NULL);
1536         if (pde == NULL)
1537                 return;
1538
1539         pde->proc_fops = &proc_ops;
1540         pde->data = sl811;
1541         sl811->pde = pde;
1542 }
1543
1544 static void remove_debug_file(struct sl811 *sl811)
1545 {
1546         if (sl811->pde)
1547                 remove_proc_entry(proc_filename, NULL);
1548 }
1549
1550 #endif
1551
1552 /*-------------------------------------------------------------------------*/
1553
1554 static void
1555 sl811h_stop(struct usb_hcd *hcd)
1556 {
1557         struct sl811    *sl811 = hcd_to_sl811(hcd);
1558         unsigned long   flags;
1559
1560         del_timer_sync(&hcd->rh_timer);
1561
1562         spin_lock_irqsave(&sl811->lock, flags);
1563         port_power(sl811, 0);
1564         spin_unlock_irqrestore(&sl811->lock, flags);
1565 }
1566
1567 static int
1568 sl811h_start(struct usb_hcd *hcd)
1569 {
1570         struct sl811            *sl811 = hcd_to_sl811(hcd);
1571
1572         /* chip has been reset, VBUS power is off */
1573         hcd->state = HC_STATE_RUNNING;
1574
1575         if (sl811->board) {
1576                 if (!device_can_wakeup(hcd->self.controller))
1577                         device_init_wakeup(hcd->self.controller,
1578                                 sl811->board->can_wakeup);
1579                 hcd->power_budget = sl811->board->power * 2;
1580         }
1581
1582         /* enable power and interupts */
1583         port_power(sl811, 1);
1584
1585         return 0;
1586 }
1587
1588 /*-------------------------------------------------------------------------*/
1589
1590 static struct hc_driver sl811h_hc_driver = {
1591         .description =          hcd_name,
1592         .hcd_priv_size =        sizeof(struct sl811),
1593
1594         /*
1595          * generic hardware linkage
1596          */
1597         .irq =                  sl811h_irq,
1598         .flags =                HCD_USB11 | HCD_MEMORY,
1599
1600         /* Basic lifecycle operations */
1601         .start =                sl811h_start,
1602         .stop =                 sl811h_stop,
1603
1604         /*
1605          * managing i/o requests and associated device resources
1606          */
1607         .urb_enqueue =          sl811h_urb_enqueue,
1608         .urb_dequeue =          sl811h_urb_dequeue,
1609         .endpoint_disable =     sl811h_endpoint_disable,
1610
1611         /*
1612          * periodic schedule support
1613          */
1614         .get_frame_number =     sl811h_get_frame,
1615
1616         /*
1617          * root hub support
1618          */
1619         .hub_status_data =      sl811h_hub_status_data,
1620         .hub_control =          sl811h_hub_control,
1621         .bus_suspend =          sl811h_bus_suspend,
1622         .bus_resume =           sl811h_bus_resume,
1623 };
1624
1625 /*-------------------------------------------------------------------------*/
1626
1627 static int __devexit
1628 sl811h_remove(struct platform_device *dev)
1629 {
1630         struct usb_hcd          *hcd = platform_get_drvdata(dev);
1631         struct sl811            *sl811 = hcd_to_sl811(hcd);
1632         struct resource         *res;
1633
1634         remove_debug_file(sl811);
1635         usb_remove_hcd(hcd);
1636
1637         /* some platforms may use IORESOURCE_IO */
1638         res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1639         if (res)
1640                 iounmap(sl811->data_reg);
1641
1642         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1643         if (res)
1644                 iounmap(sl811->addr_reg);
1645
1646         usb_put_hcd(hcd);
1647         return 0;
1648 }
1649
1650 static int __devinit
1651 sl811h_probe(struct platform_device *dev)
1652 {
1653         struct usb_hcd          *hcd;
1654         struct sl811            *sl811;
1655         struct resource         *addr, *data;
1656         int                     irq;
1657         void __iomem            *addr_reg;
1658         void __iomem            *data_reg;
1659         int                     retval;
1660         u8                      tmp, ioaddr = 0;
1661
1662         /* basic sanity checks first.  board-specific init logic should
1663          * have initialized these three resources and probably board
1664          * specific platform_data.  we don't probe for IRQs, and do only
1665          * minimal sanity checking.
1666          */
1667         irq = platform_get_irq(dev, 0);
1668         if (dev->num_resources < 3 || irq < 0)
1669                 return -ENODEV;
1670
1671         /* refuse to confuse usbcore */
1672         if (dev->dev.dma_mask) {
1673                 DBG("no we won't dma\n");
1674                 return -EINVAL;
1675         }
1676
1677         /* the chip may be wired for either kind of addressing */
1678         addr = platform_get_resource(dev, IORESOURCE_MEM, 0);
1679         data = platform_get_resource(dev, IORESOURCE_MEM, 1);
1680         retval = -EBUSY;
1681         if (!addr || !data) {
1682                 addr = platform_get_resource(dev, IORESOURCE_IO, 0);
1683                 data = platform_get_resource(dev, IORESOURCE_IO, 1);
1684                 if (!addr || !data)
1685                         return -ENODEV;
1686                 ioaddr = 1;
1687
1688                 addr_reg = (void __iomem *) addr->start;
1689                 data_reg = (void __iomem *) data->start;
1690         } else {
1691                 addr_reg = ioremap(addr->start, 1);
1692                 if (addr_reg == NULL) {
1693                         retval = -ENOMEM;
1694                         goto err2;
1695                 }
1696
1697                 data_reg = ioremap(data->start, 1);
1698                 if (data_reg == NULL) {
1699                         retval = -ENOMEM;
1700                         goto err4;
1701                 }
1702         }
1703
1704         /* allocate and initialize hcd */
1705         hcd = usb_create_hcd(&sl811h_hc_driver, &dev->dev, dev->dev.bus_id);
1706         if (!hcd) {
1707                 retval = -ENOMEM;
1708                 goto err5;
1709         }
1710         hcd->rsrc_start = addr->start;
1711         sl811 = hcd_to_sl811(hcd);
1712
1713         spin_lock_init(&sl811->lock);
1714         INIT_LIST_HEAD(&sl811->async);
1715         sl811->board = dev->dev.platform_data;
1716         init_timer(&sl811->timer);
1717         sl811->timer.function = sl811h_timer;
1718         sl811->timer.data = (unsigned long) sl811;
1719         sl811->addr_reg = addr_reg;
1720         sl811->data_reg = data_reg;
1721
1722         spin_lock_irq(&sl811->lock);
1723         port_power(sl811, 0);
1724         spin_unlock_irq(&sl811->lock);
1725         msleep(200);
1726
1727         tmp = sl811_read(sl811, SL11H_HWREVREG);
1728         switch (tmp >> 4) {
1729         case 1:
1730                 hcd->product_desc = "SL811HS v1.2";
1731                 break;
1732         case 2:
1733                 hcd->product_desc = "SL811HS v1.5";
1734                 break;
1735         default:
1736                 /* reject case 0, SL11S is less functional */
1737                 DBG("chiprev %02x\n", tmp);
1738                 retval = -ENXIO;
1739                 goto err6;
1740         }
1741
1742         /* The chip's IRQ is level triggered, active high.  A requirement
1743          * for platform device setup is to cope with things like signal
1744          * inverters (e.g. CF is active low) or working only with edge
1745          * triggers (e.g. most ARM CPUs).  Initial driver stress testing
1746          * was on a system with single edge triggering, so most sorts of
1747          * triggering arrangement should work.
1748          */
1749         retval = usb_add_hcd(hcd, irq, SA_INTERRUPT | SA_SHIRQ);
1750         if (retval != 0)
1751                 goto err6;
1752
1753         create_debug_file(sl811);
1754         return retval;
1755
1756  err6:
1757         usb_put_hcd(hcd);
1758  err5:
1759         if (!ioaddr)
1760                 iounmap(data_reg);
1761  err4:
1762         if (!ioaddr)
1763                 iounmap(addr_reg);
1764  err2:
1765         DBG("init error, %d\n", retval);
1766         return retval;
1767 }
1768
1769 #ifdef  CONFIG_PM
1770
1771 /* for this device there's no useful distinction between the controller
1772  * and its root hub, except that the root hub only gets direct PM calls
1773  * when CONFIG_USB_SUSPEND is enabled.
1774  */
1775
1776 static int
1777 sl811h_suspend(struct platform_device *dev, pm_message_t state)
1778 {
1779         struct usb_hcd  *hcd = platform_get_drvdata(dev);
1780         struct sl811    *sl811 = hcd_to_sl811(hcd);
1781         int             retval = 0;
1782
1783         if (state.event == PM_EVENT_FREEZE)
1784                 retval = sl811h_bus_suspend(hcd);
1785         else if (state.event == PM_EVENT_SUSPEND)
1786                 port_power(sl811, 0);
1787         if (retval == 0)
1788                 dev->dev.power.power_state = state;
1789         return retval;
1790 }
1791
1792 static int
1793 sl811h_resume(struct platform_device *dev)
1794 {
1795         struct usb_hcd  *hcd = platform_get_drvdata(dev);
1796         struct sl811    *sl811 = hcd_to_sl811(hcd);
1797
1798         /* with no "check to see if VBUS is still powered" board hook,
1799          * let's assume it'd only be powered to enable remote wakeup.
1800          */
1801         if (dev->dev.power.power_state.event == PM_EVENT_SUSPEND
1802                         || !device_can_wakeup(&hcd->self.root_hub->dev)) {
1803                 sl811->port1 = 0;
1804                 port_power(sl811, 1);
1805                 usb_root_hub_lost_power(hcd->self.root_hub);
1806                 return 0;
1807         }
1808
1809         dev->dev.power.power_state = PMSG_ON;
1810         return sl811h_bus_resume(hcd);
1811 }
1812
1813 #else
1814
1815 #define sl811h_suspend  NULL
1816 #define sl811h_resume   NULL
1817
1818 #endif
1819
1820
1821 /* this driver is exported so sl811_cs can depend on it */
1822 struct platform_driver sl811h_driver = {
1823         .probe =        sl811h_probe,
1824         .remove =       __devexit_p(sl811h_remove),
1825
1826         .suspend =      sl811h_suspend,
1827         .resume =       sl811h_resume,
1828         .driver = {
1829                 .name = (char *) hcd_name,
1830                 .owner = THIS_MODULE,
1831         },
1832 };
1833 EXPORT_SYMBOL(sl811h_driver);
1834
1835 /*-------------------------------------------------------------------------*/
1836
1837 static int __init sl811h_init(void)
1838 {
1839         if (usb_disabled())
1840                 return -ENODEV;
1841
1842         INFO("driver %s, %s\n", hcd_name, DRIVER_VERSION);
1843         return platform_driver_register(&sl811h_driver);
1844 }
1845 module_init(sl811h_init);
1846
1847 static void __exit sl811h_cleanup(void)
1848 {
1849         platform_driver_unregister(&sl811h_driver);
1850 }
1851 module_exit(sl811h_cleanup);