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Linux 4.19.133
[linux/fpc-iii.git] / drivers / usb / musb / musb_core.c
blob28b4cacf7a78740408c7b95a5d4708eae5697c11
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * MUSB OTG driver core code
4 *
5 * Copyright 2005 Mentor Graphics Corporation
6 * Copyright (C) 2005-2006 by Texas Instruments
7 * Copyright (C) 2006-2007 Nokia Corporation
8 */
9
10 /*
11 * Inventra (Multipoint) Dual-Role Controller Driver for Linux.
12 *
13 * This consists of a Host Controller Driver (HCD) and a peripheral
14 * controller driver implementing the "Gadget" API; OTG support is
15 * in the works. These are normal Linux-USB controller drivers which
16 * use IRQs and have no dedicated thread.
17 *
18 * This version of the driver has only been used with products from
19 * Texas Instruments. Those products integrate the Inventra logic
20 * with other DMA, IRQ, and bus modules, as well as other logic that
21 * needs to be reflected in this driver.
22 *
23 *
24 * NOTE: the original Mentor code here was pretty much a collection
25 * of mechanisms that don't seem to have been fully integrated/working
26 * for *any* Linux kernel version. This version aims at Linux 2.6.now,
27 * Key open issues include:
28 *
29 * - Lack of host-side transaction scheduling, for all transfer types.
30 * The hardware doesn't do it; instead, software must.
31 *
32 * This is not an issue for OTG devices that don't support external
33 * hubs, but for more "normal" USB hosts it's a user issue that the
34 * "multipoint" support doesn't scale in the expected ways. That
35 * includes DaVinci EVM in a common non-OTG mode.
36 *
37 * * Control and bulk use dedicated endpoints, and there's as
38 * yet no mechanism to either (a) reclaim the hardware when
39 * peripherals are NAKing, which gets complicated with bulk
40 * endpoints, or (b) use more than a single bulk endpoint in
41 * each direction.
42 *
43 * RESULT: one device may be perceived as blocking another one.
44 *
45 * * Interrupt and isochronous will dynamically allocate endpoint
46 * hardware, but (a) there's no record keeping for bandwidth;
47 * (b) in the common case that few endpoints are available, there
48 * is no mechanism to reuse endpoints to talk to multiple devices.
49 *
50 * RESULT: At one extreme, bandwidth can be overcommitted in
51 * some hardware configurations, no faults will be reported.
52 * At the other extreme, the bandwidth capabilities which do
53 * exist tend to be severely undercommitted. You can't yet hook
54 * up both a keyboard and a mouse to an external USB hub.
55 */
56
57 /*
58 * This gets many kinds of configuration information:
59 * - Kconfig for everything user-configurable
60 * - platform_device for addressing, irq, and platform_data
61 * - platform_data is mostly for board-specific information
62 * (plus recentrly, SOC or family details)
63 *
64 * Most of the conditional compilation will (someday) vanish.
65 */
66
67 #include <linux/module.h>
68 #include <linux/kernel.h>
69 #include <linux/sched.h>
70 #include <linux/slab.h>
71 #include <linux/list.h>
72 #include <linux/kobject.h>
73 #include <linux/prefetch.h>
74 #include <linux/platform_device.h>
75 #include <linux/io.h>
76 #include <linux/dma-mapping.h>
77 #include <linux/usb.h>
78 #include <linux/usb/of.h>
79
80 #include "musb_core.h"
81 #include "musb_trace.h"
82
83 #define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON)
84
85
86 #define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia"
87 #define DRIVER_DESC "Inventra Dual-Role USB Controller Driver"
88
89 #define MUSB_VERSION "6.0"
90
91 #define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION
92
93 #define MUSB_DRIVER_NAME "musb-hdrc"
94 const char musb_driver_name[] = MUSB_DRIVER_NAME;
95
96 MODULE_DESCRIPTION(DRIVER_INFO);
97 MODULE_AUTHOR(DRIVER_AUTHOR);
98 MODULE_LICENSE("GPL");
99 MODULE_ALIAS("platform:" MUSB_DRIVER_NAME);
100
101
102 /*-------------------------------------------------------------------------*/
103
104 static inline struct musb *dev_to_musb(struct device *dev)
105 {
106 return dev_get_drvdata(dev);
107 }
108
109 enum musb_mode musb_get_mode(struct device *dev)
110 {
111 enum usb_dr_mode mode;
112
113 mode = usb_get_dr_mode(dev);
114 switch (mode) {
115 case USB_DR_MODE_HOST:
116 return MUSB_HOST;
117 case USB_DR_MODE_PERIPHERAL:
118 return MUSB_PERIPHERAL;
119 case USB_DR_MODE_OTG:
120 case USB_DR_MODE_UNKNOWN:
121 default:
122 return MUSB_OTG;
123 }
124 }
125 EXPORT_SYMBOL_GPL(musb_get_mode);
126
127 /*-------------------------------------------------------------------------*/
128
129 static int musb_ulpi_read(struct usb_phy *phy, u32 reg)
130 {
131 void __iomem *addr = phy->io_priv;
132 int i = 0;
133 u8 r;
134 u8 power;
135 int ret;
136
137 pm_runtime_get_sync(phy->io_dev);
138
139 /* Make sure the transceiver is not in low power mode */
140 power = musb_readb(addr, MUSB_POWER);
141 power &= ~MUSB_POWER_SUSPENDM;
142 musb_writeb(addr, MUSB_POWER, power);
143
144 /* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the
145 * ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM.
146 */
147
148 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
149 musb_writeb(addr, MUSB_ULPI_REG_CONTROL,
150 MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR);
151
152 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
153 & MUSB_ULPI_REG_CMPLT)) {
154 i++;
155 if (i == 10000) {
156 ret = -ETIMEDOUT;
157 goto out;
158 }
159
160 }
161 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
162 r &= ~MUSB_ULPI_REG_CMPLT;
163 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
164
165 ret = musb_readb(addr, MUSB_ULPI_REG_DATA);
166
167 out:
168 pm_runtime_put(phy->io_dev);
169
170 return ret;
171 }
172
173 static int musb_ulpi_write(struct usb_phy *phy, u32 val, u32 reg)
174 {
175 void __iomem *addr = phy->io_priv;
176 int i = 0;
177 u8 r = 0;
178 u8 power;
179 int ret = 0;
180
181 pm_runtime_get_sync(phy->io_dev);
182
183 /* Make sure the transceiver is not in low power mode */
184 power = musb_readb(addr, MUSB_POWER);
185 power &= ~MUSB_POWER_SUSPENDM;
186 musb_writeb(addr, MUSB_POWER, power);
187
188 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
189 musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)val);
190 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ);
191
192 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
193 & MUSB_ULPI_REG_CMPLT)) {
194 i++;
195 if (i == 10000) {
196 ret = -ETIMEDOUT;
197 goto out;
198 }
199 }
200
201 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
202 r &= ~MUSB_ULPI_REG_CMPLT;
203 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
204
205 out:
206 pm_runtime_put(phy->io_dev);
207
208 return ret;
209 }
210
211 static struct usb_phy_io_ops musb_ulpi_access = {
212 .read = musb_ulpi_read,
213 .write = musb_ulpi_write,
214 };
215
216 /*-------------------------------------------------------------------------*/
217
218 static u32 musb_default_fifo_offset(u8 epnum)
219 {
220 return 0x20 + (epnum * 4);
221 }
222
223 /* "flat" mapping: each endpoint has its own i/o address */
224 static void musb_flat_ep_select(void __iomem *mbase, u8 epnum)
225 {
226 }
227
228 static u32 musb_flat_ep_offset(u8 epnum, u16 offset)
229 {
230 return 0x100 + (0x10 * epnum) + offset;
231 }
232
233 /* "indexed" mapping: INDEX register controls register bank select */
234 static void musb_indexed_ep_select(void __iomem *mbase, u8 epnum)
235 {
236 musb_writeb(mbase, MUSB_INDEX, epnum);
237 }
238
239 static u32 musb_indexed_ep_offset(u8 epnum, u16 offset)
240 {
241 return 0x10 + offset;
242 }
243
244 static u32 musb_default_busctl_offset(u8 epnum, u16 offset)
245 {
246 return 0x80 + (0x08 * epnum) + offset;
247 }
248
249 static u8 musb_default_readb(const void __iomem *addr, unsigned offset)
250 {
251 u8 data = __raw_readb(addr + offset);
252
253 trace_musb_readb(__builtin_return_address(0), addr, offset, data);
254 return data;
255 }
256
257 static void musb_default_writeb(void __iomem *addr, unsigned offset, u8 data)
258 {
259 trace_musb_writeb(__builtin_return_address(0), addr, offset, data);
260 __raw_writeb(data, addr + offset);
261 }
262
263 static u16 musb_default_readw(const void __iomem *addr, unsigned offset)
264 {
265 u16 data = __raw_readw(addr + offset);
266
267 trace_musb_readw(__builtin_return_address(0), addr, offset, data);
268 return data;
269 }
270
271 static void musb_default_writew(void __iomem *addr, unsigned offset, u16 data)
272 {
273 trace_musb_writew(__builtin_return_address(0), addr, offset, data);
274 __raw_writew(data, addr + offset);
275 }
276
277 /*
278 * Load an endpoint's FIFO
279 */
280 static void musb_default_write_fifo(struct musb_hw_ep *hw_ep, u16 len,
281 const u8 *src)
282 {
283 struct musb *musb = hw_ep->musb;
284 void __iomem *fifo = hw_ep->fifo;
285
286 if (unlikely(len == 0))
287 return;
288
289 prefetch((u8 *)src);
290
291 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
292 'T', hw_ep->epnum, fifo, len, src);
293
294 /* we can't assume unaligned reads work */
295 if (likely((0x01 & (unsigned long) src) == 0)) {
296 u16 index = 0;
297
298 /* best case is 32bit-aligned source address */
299 if ((0x02 & (unsigned long) src) == 0) {
300 if (len >= 4) {
301 iowrite32_rep(fifo, src + index, len >> 2);
302 index += len & ~0x03;
303 }
304 if (len & 0x02) {
305 __raw_writew(*(u16 *)&src[index], fifo);
306 index += 2;
307 }
308 } else {
309 if (len >= 2) {
310 iowrite16_rep(fifo, src + index, len >> 1);
311 index += len & ~0x01;
312 }
313 }
314 if (len & 0x01)
315 __raw_writeb(src[index], fifo);
316 } else {
317 /* byte aligned */
318 iowrite8_rep(fifo, src, len);
319 }
320 }
321
322 /*
323 * Unload an endpoint's FIFO
324 */
325 static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
326 {
327 struct musb *musb = hw_ep->musb;
328 void __iomem *fifo = hw_ep->fifo;
329
330 if (unlikely(len == 0))
331 return;
332
333 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
334 'R', hw_ep->epnum, fifo, len, dst);
335
336 /* we can't assume unaligned writes work */
337 if (likely((0x01 & (unsigned long) dst) == 0)) {
338 u16 index = 0;
339
340 /* best case is 32bit-aligned destination address */
341 if ((0x02 & (unsigned long) dst) == 0) {
342 if (len >= 4) {
343 ioread32_rep(fifo, dst, len >> 2);
344 index = len & ~0x03;
345 }
346 if (len & 0x02) {
347 *(u16 *)&dst[index] = __raw_readw(fifo);
348 index += 2;
349 }
350 } else {
351 if (len >= 2) {
352 ioread16_rep(fifo, dst, len >> 1);
353 index = len & ~0x01;
354 }
355 }
356 if (len & 0x01)
357 dst[index] = __raw_readb(fifo);
358 } else {
359 /* byte aligned */
360 ioread8_rep(fifo, dst, len);
361 }
362 }
363
364 /*
365 * Old style IO functions
366 */
367 u8 (*musb_readb)(const void __iomem *addr, unsigned offset);
368 EXPORT_SYMBOL_GPL(musb_readb);
369
370 void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
371 EXPORT_SYMBOL_GPL(musb_writeb);
372
373 u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
374 EXPORT_SYMBOL_GPL(musb_readw);
375
376 void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
377 EXPORT_SYMBOL_GPL(musb_writew);
378
379 u32 musb_readl(const void __iomem *addr, unsigned offset)
380 {
381 u32 data = __raw_readl(addr + offset);
382
383 trace_musb_readl(__builtin_return_address(0), addr, offset, data);
384 return data;
385 }
386 EXPORT_SYMBOL_GPL(musb_readl);
387
388 void musb_writel(void __iomem *addr, unsigned offset, u32 data)
389 {
390 trace_musb_writel(__builtin_return_address(0), addr, offset, data);
391 __raw_writel(data, addr + offset);
392 }
393 EXPORT_SYMBOL_GPL(musb_writel);
394
395 #ifndef CONFIG_MUSB_PIO_ONLY
396 struct dma_controller *
397 (*musb_dma_controller_create)(struct musb *musb, void __iomem *base);
398 EXPORT_SYMBOL(musb_dma_controller_create);
399
400 void (*musb_dma_controller_destroy)(struct dma_controller *c);
401 EXPORT_SYMBOL(musb_dma_controller_destroy);
402 #endif
403
404 /*
405 * New style IO functions
406 */
407 void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
408 {
409 return hw_ep->musb->io.read_fifo(hw_ep, len, dst);
410 }
411
412 void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
413 {
414 return hw_ep->musb->io.write_fifo(hw_ep, len, src);
415 }
416
417 /*-------------------------------------------------------------------------*/
418
419 /* for high speed test mode; see USB 2.0 spec 7.1.20 */
420 static const u8 musb_test_packet[53] = {
421 /* implicit SYNC then DATA0 to start */
422
423 /* JKJKJKJK x9 */
424 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
425 /* JJKKJJKK x8 */
426 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
427 /* JJJJKKKK x8 */
428 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
429 /* JJJJJJJKKKKKKK x8 */
430 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
431 /* JJJJJJJK x8 */
432 0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd,
433 /* JKKKKKKK x10, JK */
434 0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e
435
436 /* implicit CRC16 then EOP to end */
437 };
438
439 void musb_load_testpacket(struct musb *musb)
440 {
441 void __iomem *regs = musb->endpoints[0].regs;
442
443 musb_ep_select(musb->mregs, 0);
444 musb_write_fifo(musb->control_ep,
445 sizeof(musb_test_packet), musb_test_packet);
446 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY);
447 }
448
449 /*-------------------------------------------------------------------------*/
450
451 /*
452 * Handles OTG hnp timeouts, such as b_ase0_brst
453 */
454 static void musb_otg_timer_func(struct timer_list *t)
455 {
456 struct musb *musb = from_timer(musb, t, otg_timer);
457 unsigned long flags;
458
459 spin_lock_irqsave(&musb->lock, flags);
460 switch (musb->xceiv->otg->state) {
461 case OTG_STATE_B_WAIT_ACON:
462 musb_dbg(musb,
463 "HNP: b_wait_acon timeout; back to b_peripheral");
464 musb_g_disconnect(musb);
465 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
466 musb->is_active = 0;
467 break;
468 case OTG_STATE_A_SUSPEND:
469 case OTG_STATE_A_WAIT_BCON:
470 musb_dbg(musb, "HNP: %s timeout",
471 usb_otg_state_string(musb->xceiv->otg->state));
472 musb_platform_set_vbus(musb, 0);
473 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
474 break;
475 default:
476 musb_dbg(musb, "HNP: Unhandled mode %s",
477 usb_otg_state_string(musb->xceiv->otg->state));
478 }
479 spin_unlock_irqrestore(&musb->lock, flags);
480 }
481
482 /*
483 * Stops the HNP transition. Caller must take care of locking.
484 */
485 void musb_hnp_stop(struct musb *musb)
486 {
487 struct usb_hcd *hcd = musb->hcd;
488 void __iomem *mbase = musb->mregs;
489 u8 reg;
490
491 musb_dbg(musb, "HNP: stop from %s",
492 usb_otg_state_string(musb->xceiv->otg->state));
493
494 switch (musb->xceiv->otg->state) {
495 case OTG_STATE_A_PERIPHERAL:
496 musb_g_disconnect(musb);
497 musb_dbg(musb, "HNP: back to %s",
498 usb_otg_state_string(musb->xceiv->otg->state));
499 break;
500 case OTG_STATE_B_HOST:
501 musb_dbg(musb, "HNP: Disabling HR");
502 if (hcd)
503 hcd->self.is_b_host = 0;
504 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
505 MUSB_DEV_MODE(musb);
506 reg = musb_readb(mbase, MUSB_POWER);
507 reg |= MUSB_POWER_SUSPENDM;
508 musb_writeb(mbase, MUSB_POWER, reg);
509 /* REVISIT: Start SESSION_REQUEST here? */
510 break;
511 default:
512 musb_dbg(musb, "HNP: Stopping in unknown state %s",
513 usb_otg_state_string(musb->xceiv->otg->state));
514 }
515
516 /*
517 * When returning to A state after HNP, avoid hub_port_rebounce(),
518 * which cause occasional OPT A "Did not receive reset after connect"
519 * errors.
520 */
521 musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16);
522 }
523
524 static void musb_recover_from_babble(struct musb *musb);
525
526 static void musb_handle_intr_resume(struct musb *musb, u8 devctl)
527 {
528 musb_dbg(musb, "RESUME (%s)",
529 usb_otg_state_string(musb->xceiv->otg->state));
530
531 if (devctl & MUSB_DEVCTL_HM) {
532 switch (musb->xceiv->otg->state) {
533 case OTG_STATE_A_SUSPEND:
534 /* remote wakeup? */
535 musb->port1_status |=
536 (USB_PORT_STAT_C_SUSPEND << 16)
537 | MUSB_PORT_STAT_RESUME;
538 musb->rh_timer = jiffies
539 + msecs_to_jiffies(USB_RESUME_TIMEOUT);
540 musb->xceiv->otg->state = OTG_STATE_A_HOST;
541 musb->is_active = 1;
542 musb_host_resume_root_hub(musb);
543 schedule_delayed_work(&musb->finish_resume_work,
544 msecs_to_jiffies(USB_RESUME_TIMEOUT));
545 break;
546 case OTG_STATE_B_WAIT_ACON:
547 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
548 musb->is_active = 1;
549 MUSB_DEV_MODE(musb);
550 break;
551 default:
552 WARNING("bogus %s RESUME (%s)\n",
553 "host",
554 usb_otg_state_string(musb->xceiv->otg->state));
555 }
556 } else {
557 switch (musb->xceiv->otg->state) {
558 case OTG_STATE_A_SUSPEND:
559 /* possibly DISCONNECT is upcoming */
560 musb->xceiv->otg->state = OTG_STATE_A_HOST;
561 musb_host_resume_root_hub(musb);
562 break;
563 case OTG_STATE_B_WAIT_ACON:
564 case OTG_STATE_B_PERIPHERAL:
565 /* disconnect while suspended? we may
566 * not get a disconnect irq...
567 */
568 if ((devctl & MUSB_DEVCTL_VBUS)
569 != (3 << MUSB_DEVCTL_VBUS_SHIFT)
570 ) {
571 musb->int_usb |= MUSB_INTR_DISCONNECT;
572 musb->int_usb &= ~MUSB_INTR_SUSPEND;
573 break;
574 }
575 musb_g_resume(musb);
576 break;
577 case OTG_STATE_B_IDLE:
578 musb->int_usb &= ~MUSB_INTR_SUSPEND;
579 break;
580 default:
581 WARNING("bogus %s RESUME (%s)\n",
582 "peripheral",
583 usb_otg_state_string(musb->xceiv->otg->state));
584 }
585 }
586 }
587
588 /* return IRQ_HANDLED to tell the caller to return immediately */
589 static irqreturn_t musb_handle_intr_sessreq(struct musb *musb, u8 devctl)
590 {
591 void __iomem *mbase = musb->mregs;
592
593 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS
594 && (devctl & MUSB_DEVCTL_BDEVICE)) {
595 musb_dbg(musb, "SessReq while on B state");
596 return IRQ_HANDLED;
597 }
598
599 musb_dbg(musb, "SESSION_REQUEST (%s)",
600 usb_otg_state_string(musb->xceiv->otg->state));
601
602 /* IRQ arrives from ID pin sense or (later, if VBUS power
603 * is removed) SRP. responses are time critical:
604 * - turn on VBUS (with silicon-specific mechanism)
605 * - go through A_WAIT_VRISE
606 * - ... to A_WAIT_BCON.
607 * a_wait_vrise_tmout triggers VBUS_ERROR transitions
608 */
609 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
610 musb->ep0_stage = MUSB_EP0_START;
611 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
612 MUSB_HST_MODE(musb);
613 musb_platform_set_vbus(musb, 1);
614
615 return IRQ_NONE;
616 }
617
618 static void musb_handle_intr_vbuserr(struct musb *musb, u8 devctl)
619 {
620 int ignore = 0;
621
622 /* During connection as an A-Device, we may see a short
623 * current spikes causing voltage drop, because of cable
624 * and peripheral capacitance combined with vbus draw.
625 * (So: less common with truly self-powered devices, where
626 * vbus doesn't act like a power supply.)
627 *
628 * Such spikes are short; usually less than ~500 usec, max
629 * of ~2 msec. That is, they're not sustained overcurrent
630 * errors, though they're reported using VBUSERROR irqs.
631 *
632 * Workarounds: (a) hardware: use self powered devices.
633 * (b) software: ignore non-repeated VBUS errors.
634 *
635 * REVISIT: do delays from lots of DEBUG_KERNEL checks
636 * make trouble here, keeping VBUS < 4.4V ?
637 */
638 switch (musb->xceiv->otg->state) {
639 case OTG_STATE_A_HOST:
640 /* recovery is dicey once we've gotten past the
641 * initial stages of enumeration, but if VBUS
642 * stayed ok at the other end of the link, and
643 * another reset is due (at least for high speed,
644 * to redo the chirp etc), it might work OK...
645 */
646 case OTG_STATE_A_WAIT_BCON:
647 case OTG_STATE_A_WAIT_VRISE:
648 if (musb->vbuserr_retry) {
649 void __iomem *mbase = musb->mregs;
650
651 musb->vbuserr_retry--;
652 ignore = 1;
653 devctl |= MUSB_DEVCTL_SESSION;
654 musb_writeb(mbase, MUSB_DEVCTL, devctl);
655 } else {
656 musb->port1_status |=
657 USB_PORT_STAT_OVERCURRENT
658 | (USB_PORT_STAT_C_OVERCURRENT << 16);
659 }
660 break;
661 default:
662 break;
663 }
664
665 dev_printk(ignore ? KERN_DEBUG : KERN_ERR, musb->controller,
666 "VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n",
667 usb_otg_state_string(musb->xceiv->otg->state),
668 devctl,
669 ({ char *s;
670 switch (devctl & MUSB_DEVCTL_VBUS) {
671 case 0 << MUSB_DEVCTL_VBUS_SHIFT:
672 s = "<SessEnd"; break;
673 case 1 << MUSB_DEVCTL_VBUS_SHIFT:
674 s = "<AValid"; break;
675 case 2 << MUSB_DEVCTL_VBUS_SHIFT:
676 s = "<VBusValid"; break;
677 /* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */
678 default:
679 s = "VALID"; break;
680 } s; }),
681 VBUSERR_RETRY_COUNT - musb->vbuserr_retry,
682 musb->port1_status);
683
684 /* go through A_WAIT_VFALL then start a new session */
685 if (!ignore)
686 musb_platform_set_vbus(musb, 0);
687 }
688
689 static void musb_handle_intr_suspend(struct musb *musb, u8 devctl)
690 {
691 musb_dbg(musb, "SUSPEND (%s) devctl %02x",
692 usb_otg_state_string(musb->xceiv->otg->state), devctl);
693
694 switch (musb->xceiv->otg->state) {
695 case OTG_STATE_A_PERIPHERAL:
696 /* We also come here if the cable is removed, since
697 * this silicon doesn't report ID-no-longer-grounded.
698 *
699 * We depend on T(a_wait_bcon) to shut us down, and
700 * hope users don't do anything dicey during this
701 * undesired detour through A_WAIT_BCON.
702 */
703 musb_hnp_stop(musb);
704 musb_host_resume_root_hub(musb);
705 musb_root_disconnect(musb);
706 musb_platform_try_idle(musb, jiffies
707 + msecs_to_jiffies(musb->a_wait_bcon
708 ? : OTG_TIME_A_WAIT_BCON));
709
710 break;
711 case OTG_STATE_B_IDLE:
712 if (!musb->is_active)
713 break;
714 /* fall through */
715 case OTG_STATE_B_PERIPHERAL:
716 musb_g_suspend(musb);
717 musb->is_active = musb->g.b_hnp_enable;
718 if (musb->is_active) {
719 musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
720 musb_dbg(musb, "HNP: Setting timer for b_ase0_brst");
721 mod_timer(&musb->otg_timer, jiffies
722 + msecs_to_jiffies(
723 OTG_TIME_B_ASE0_BRST));
724 }
725 break;
726 case OTG_STATE_A_WAIT_BCON:
727 if (musb->a_wait_bcon != 0)
728 musb_platform_try_idle(musb, jiffies
729 + msecs_to_jiffies(musb->a_wait_bcon));
730 break;
731 case OTG_STATE_A_HOST:
732 musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
733 musb->is_active = musb->hcd->self.b_hnp_enable;
734 break;
735 case OTG_STATE_B_HOST:
736 /* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */
737 musb_dbg(musb, "REVISIT: SUSPEND as B_HOST");
738 break;
739 default:
740 /* "should not happen" */
741 musb->is_active = 0;
742 break;
743 }
744 }
745
746 static void musb_handle_intr_connect(struct musb *musb, u8 devctl, u8 int_usb)
747 {
748 struct usb_hcd *hcd = musb->hcd;
749
750 musb->is_active = 1;
751 musb->ep0_stage = MUSB_EP0_START;
752
753 musb->intrtxe = musb->epmask;
754 musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe);
755 musb->intrrxe = musb->epmask & 0xfffe;
756 musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe);
757 musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7);
758 musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED
759 |USB_PORT_STAT_HIGH_SPEED
760 |USB_PORT_STAT_ENABLE
761 );
762 musb->port1_status |= USB_PORT_STAT_CONNECTION
763 |(USB_PORT_STAT_C_CONNECTION << 16);
764
765 /* high vs full speed is just a guess until after reset */
766 if (devctl & MUSB_DEVCTL_LSDEV)
767 musb->port1_status |= USB_PORT_STAT_LOW_SPEED;
768
769 /* indicate new connection to OTG machine */
770 switch (musb->xceiv->otg->state) {
771 case OTG_STATE_B_PERIPHERAL:
772 if (int_usb & MUSB_INTR_SUSPEND) {
773 musb_dbg(musb, "HNP: SUSPEND+CONNECT, now b_host");
774 int_usb &= ~MUSB_INTR_SUSPEND;
775 goto b_host;
776 } else
777 musb_dbg(musb, "CONNECT as b_peripheral???");
778 break;
779 case OTG_STATE_B_WAIT_ACON:
780 musb_dbg(musb, "HNP: CONNECT, now b_host");
781 b_host:
782 musb->xceiv->otg->state = OTG_STATE_B_HOST;
783 if (musb->hcd)
784 musb->hcd->self.is_b_host = 1;
785 del_timer(&musb->otg_timer);
786 break;
787 default:
788 if ((devctl & MUSB_DEVCTL_VBUS)
789 == (3 << MUSB_DEVCTL_VBUS_SHIFT)) {
790 musb->xceiv->otg->state = OTG_STATE_A_HOST;
791 if (hcd)
792 hcd->self.is_b_host = 0;
793 }
794 break;
795 }
796
797 musb_host_poke_root_hub(musb);
798
799 musb_dbg(musb, "CONNECT (%s) devctl %02x",
800 usb_otg_state_string(musb->xceiv->otg->state), devctl);
801 }
802
803 static void musb_handle_intr_disconnect(struct musb *musb, u8 devctl)
804 {
805 musb_dbg(musb, "DISCONNECT (%s) as %s, devctl %02x",
806 usb_otg_state_string(musb->xceiv->otg->state),
807 MUSB_MODE(musb), devctl);
808
809 switch (musb->xceiv->otg->state) {
810 case OTG_STATE_A_HOST:
811 case OTG_STATE_A_SUSPEND:
812 musb_host_resume_root_hub(musb);
813 musb_root_disconnect(musb);
814 if (musb->a_wait_bcon != 0)
815 musb_platform_try_idle(musb, jiffies
816 + msecs_to_jiffies(musb->a_wait_bcon));
817 break;
818 case OTG_STATE_B_HOST:
819 /* REVISIT this behaves for "real disconnect"
820 * cases; make sure the other transitions from
821 * from B_HOST act right too. The B_HOST code
822 * in hnp_stop() is currently not used...
823 */
824 musb_root_disconnect(musb);
825 if (musb->hcd)
826 musb->hcd->self.is_b_host = 0;
827 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
828 MUSB_DEV_MODE(musb);
829 musb_g_disconnect(musb);
830 break;
831 case OTG_STATE_A_PERIPHERAL:
832 musb_hnp_stop(musb);
833 musb_root_disconnect(musb);
834 /* FALLTHROUGH */
835 case OTG_STATE_B_WAIT_ACON:
836 /* FALLTHROUGH */
837 case OTG_STATE_B_PERIPHERAL:
838 case OTG_STATE_B_IDLE:
839 musb_g_disconnect(musb);
840 break;
841 default:
842 WARNING("unhandled DISCONNECT transition (%s)\n",
843 usb_otg_state_string(musb->xceiv->otg->state));
844 break;
845 }
846 }
847
848 /*
849 * mentor saves a bit: bus reset and babble share the same irq.
850 * only host sees babble; only peripheral sees bus reset.
851 */
852 static void musb_handle_intr_reset(struct musb *musb)
853 {
854 if (is_host_active(musb)) {
855 /*
856 * When BABBLE happens what we can depends on which
857 * platform MUSB is running, because some platforms
858 * implemented proprietary means for 'recovering' from
859 * Babble conditions. One such platform is AM335x. In
860 * most cases, however, the only thing we can do is
861 * drop the session.
862 */
863 dev_err(musb->controller, "Babble\n");
864 musb_recover_from_babble(musb);
865 } else {
866 musb_dbg(musb, "BUS RESET as %s",
867 usb_otg_state_string(musb->xceiv->otg->state));
868 switch (musb->xceiv->otg->state) {
869 case OTG_STATE_A_SUSPEND:
870 musb_g_reset(musb);
871 /* FALLTHROUGH */
872 case OTG_STATE_A_WAIT_BCON: /* OPT TD.4.7-900ms */
873 /* never use invalid T(a_wait_bcon) */
874 musb_dbg(musb, "HNP: in %s, %d msec timeout",
875 usb_otg_state_string(musb->xceiv->otg->state),
876 TA_WAIT_BCON(musb));
877 mod_timer(&musb->otg_timer, jiffies
878 + msecs_to_jiffies(TA_WAIT_BCON(musb)));
879 break;
880 case OTG_STATE_A_PERIPHERAL:
881 del_timer(&musb->otg_timer);
882 musb_g_reset(musb);
883 break;
884 case OTG_STATE_B_WAIT_ACON:
885 musb_dbg(musb, "HNP: RESET (%s), to b_peripheral",
886 usb_otg_state_string(musb->xceiv->otg->state));
887 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
888 musb_g_reset(musb);
889 break;
890 case OTG_STATE_B_IDLE:
891 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
892 /* FALLTHROUGH */
893 case OTG_STATE_B_PERIPHERAL:
894 musb_g_reset(musb);
895 break;
896 default:
897 musb_dbg(musb, "Unhandled BUS RESET as %s",
898 usb_otg_state_string(musb->xceiv->otg->state));
899 }
900 }
901 }
902
903 /*
904 * Interrupt Service Routine to record USB "global" interrupts.
905 * Since these do not happen often and signify things of
906 * paramount importance, it seems OK to check them individually;
907 * the order of the tests is specified in the manual
908 *
909 * @param musb instance pointer
910 * @param int_usb register contents
911 * @param devctl
912 * @param power
913 */
914
915 static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
916 u8 devctl)
917 {
918 irqreturn_t handled = IRQ_NONE;
919
920 musb_dbg(musb, "<== DevCtl=%02x, int_usb=0x%x", devctl, int_usb);
921
922 /* in host mode, the peripheral may issue remote wakeup.
923 * in peripheral mode, the host may resume the link.
924 * spurious RESUME irqs happen too, paired with SUSPEND.
925 */
926 if (int_usb & MUSB_INTR_RESUME) {
927 musb_handle_intr_resume(musb, devctl);
928 handled = IRQ_HANDLED;
929 }
930
931 /* see manual for the order of the tests */
932 if (int_usb & MUSB_INTR_SESSREQ) {
933 if (musb_handle_intr_sessreq(musb, devctl))
934 return IRQ_HANDLED;
935 handled = IRQ_HANDLED;
936 }
937
938 if (int_usb & MUSB_INTR_VBUSERROR) {
939 musb_handle_intr_vbuserr(musb, devctl);
940 handled = IRQ_HANDLED;
941 }
942
943 if (int_usb & MUSB_INTR_SUSPEND) {
944 musb_handle_intr_suspend(musb, devctl);
945 handled = IRQ_HANDLED;
946 }
947
948 if (int_usb & MUSB_INTR_CONNECT) {
949 musb_handle_intr_connect(musb, devctl, int_usb);
950 handled = IRQ_HANDLED;
951 }
952
953 if (int_usb & MUSB_INTR_DISCONNECT) {
954 musb_handle_intr_disconnect(musb, devctl);
955 handled = IRQ_HANDLED;
956 }
957
958 if (int_usb & MUSB_INTR_RESET) {
959 musb_handle_intr_reset(musb);
960 handled = IRQ_HANDLED;
961 }
962
963 #if 0
964 /* REVISIT ... this would be for multiplexing periodic endpoints, or
965 * supporting transfer phasing to prevent exceeding ISO bandwidth
966 * limits of a given frame or microframe.
967 *
968 * It's not needed for peripheral side, which dedicates endpoints;
969 * though it _might_ use SOF irqs for other purposes.
970 *
971 * And it's not currently needed for host side, which also dedicates
972 * endpoints, relies on TX/RX interval registers, and isn't claimed
973 * to support ISO transfers yet.
974 */
975 if (int_usb & MUSB_INTR_SOF) {
976 void __iomem *mbase = musb->mregs;
977 struct musb_hw_ep *ep;
978 u8 epnum;
979 u16 frame;
980
981 dev_dbg(musb->controller, "START_OF_FRAME\n");
982 handled = IRQ_HANDLED;
983
984 /* start any periodic Tx transfers waiting for current frame */
985 frame = musb_readw(mbase, MUSB_FRAME);
986 ep = musb->endpoints;
987 for (epnum = 1; (epnum < musb->nr_endpoints)
988 && (musb->epmask >= (1 << epnum));
989 epnum++, ep++) {
990 /*
991 * FIXME handle framecounter wraps (12 bits)
992 * eliminate duplicated StartUrb logic
993 */
994 if (ep->dwWaitFrame >= frame) {
995 ep->dwWaitFrame = 0;
996 pr_debug("SOF --> periodic TX%s on %d\n",
997 ep->tx_channel ? " DMA" : "",
998 epnum);
999 if (!ep->tx_channel)
1000 musb_h_tx_start(musb, epnum);
1001 else
1002 cppi_hostdma_start(musb, epnum);
1003 }
1004 } /* end of for loop */
1005 }
1006 #endif
1007
1008 schedule_delayed_work(&musb->irq_work, 0);
1009
1010 return handled;
1011 }
1012
1013 /*-------------------------------------------------------------------------*/
1014
1015 static void musb_disable_interrupts(struct musb *musb)
1016 {
1017 void __iomem *mbase = musb->mregs;
1018 u16 temp;
1019
1020 /* disable interrupts */
1021 musb_writeb(mbase, MUSB_INTRUSBE, 0);
1022 musb->intrtxe = 0;
1023 musb_writew(mbase, MUSB_INTRTXE, 0);
1024 musb->intrrxe = 0;
1025 musb_writew(mbase, MUSB_INTRRXE, 0);
1026
1027 /* flush pending interrupts */
1028 temp = musb_readb(mbase, MUSB_INTRUSB);
1029 temp = musb_readw(mbase, MUSB_INTRTX);
1030 temp = musb_readw(mbase, MUSB_INTRRX);
1031 }
1032
1033 static void musb_enable_interrupts(struct musb *musb)
1034 {
1035 void __iomem *regs = musb->mregs;
1036
1037 /* Set INT enable registers, enable interrupts */
1038 musb->intrtxe = musb->epmask;
1039 musb_writew(regs, MUSB_INTRTXE, musb->intrtxe);
1040 musb->intrrxe = musb->epmask & 0xfffe;
1041 musb_writew(regs, MUSB_INTRRXE, musb->intrrxe);
1042 musb_writeb(regs, MUSB_INTRUSBE, 0xf7);
1043
1044 }
1045
1046 /*
1047 * Program the HDRC to start (enable interrupts, dma, etc.).
1048 */
1049 void musb_start(struct musb *musb)
1050 {
1051 void __iomem *regs = musb->mregs;
1052 u8 devctl = musb_readb(regs, MUSB_DEVCTL);
1053 u8 power;
1054
1055 musb_dbg(musb, "<== devctl %02x", devctl);
1056
1057 musb_enable_interrupts(musb);
1058 musb_writeb(regs, MUSB_TESTMODE, 0);
1059
1060 power = MUSB_POWER_ISOUPDATE;
1061 /*
1062 * treating UNKNOWN as unspecified maximum speed, in which case
1063 * we will default to high-speed.
1064 */
1065 if (musb->config->maximum_speed == USB_SPEED_HIGH ||
1066 musb->config->maximum_speed == USB_SPEED_UNKNOWN)
1067 power |= MUSB_POWER_HSENAB;
1068 musb_writeb(regs, MUSB_POWER, power);
1069
1070 musb->is_active = 0;
1071 devctl = musb_readb(regs, MUSB_DEVCTL);
1072 devctl &= ~MUSB_DEVCTL_SESSION;
1073
1074 /* session started after:
1075 * (a) ID-grounded irq, host mode;
1076 * (b) vbus present/connect IRQ, peripheral mode;
1077 * (c) peripheral initiates, using SRP
1078 */
1079 if (musb->port_mode != MUSB_HOST &&
1080 musb->xceiv->otg->state != OTG_STATE_A_WAIT_BCON &&
1081 (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) {
1082 musb->is_active = 1;
1083 } else {
1084 devctl |= MUSB_DEVCTL_SESSION;
1085 }
1086
1087 musb_platform_enable(musb);
1088 musb_writeb(regs, MUSB_DEVCTL, devctl);
1089 }
1090
1091 /*
1092 * Make the HDRC stop (disable interrupts, etc.);
1093 * reversible by musb_start
1094 * called on gadget driver unregister
1095 * with controller locked, irqs blocked
1096 * acts as a NOP unless some role activated the hardware
1097 */
1098 void musb_stop(struct musb *musb)
1099 {
1100 /* stop IRQs, timers, ... */
1101 musb_platform_disable(musb);
1102 musb_disable_interrupts(musb);
1103 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
1104
1105 /* FIXME
1106 * - mark host and/or peripheral drivers unusable/inactive
1107 * - disable DMA (and enable it in HdrcStart)
1108 * - make sure we can musb_start() after musb_stop(); with
1109 * OTG mode, gadget driver module rmmod/modprobe cycles that
1110 * - ...
1111 */
1112 musb_platform_try_idle(musb, 0);
1113 }
1114
1115 /*-------------------------------------------------------------------------*/
1116
1117 /*
1118 * The silicon either has hard-wired endpoint configurations, or else
1119 * "dynamic fifo" sizing. The driver has support for both, though at this
1120 * writing only the dynamic sizing is very well tested. Since we switched
1121 * away from compile-time hardware parameters, we can no longer rely on
1122 * dead code elimination to leave only the relevant one in the object file.
1123 *
1124 * We don't currently use dynamic fifo setup capability to do anything
1125 * more than selecting one of a bunch of predefined configurations.
1126 */
1127 static ushort fifo_mode;
1128
1129 /* "modprobe ... fifo_mode=1" etc */
1130 module_param(fifo_mode, ushort, 0);
1131 MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration");
1132
1133 /*
1134 * tables defining fifo_mode values. define more if you like.
1135 * for host side, make sure both halves of ep1 are set up.
1136 */
1137
1138 /* mode 0 - fits in 2KB */
1139 static struct musb_fifo_cfg mode_0_cfg[] = {
1140 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1141 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1142 { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, },
1143 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1144 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1145 };
1146
1147 /* mode 1 - fits in 4KB */
1148 static struct musb_fifo_cfg mode_1_cfg[] = {
1149 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1150 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1151 { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1152 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1153 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1154 };
1155
1156 /* mode 2 - fits in 4KB */
1157 static struct musb_fifo_cfg mode_2_cfg[] = {
1158 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1159 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1160 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1161 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1162 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 960, },
1163 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 1024, },
1164 };
1165
1166 /* mode 3 - fits in 4KB */
1167 static struct musb_fifo_cfg mode_3_cfg[] = {
1168 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1169 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1170 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1171 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1172 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1173 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1174 };
1175
1176 /* mode 4 - fits in 16KB */
1177 static struct musb_fifo_cfg mode_4_cfg[] = {
1178 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1179 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1180 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1181 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1182 { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
1183 { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
1184 { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
1185 { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
1186 { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
1187 { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
1188 { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 512, },
1189 { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 512, },
1190 { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, },
1191 { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 512, },
1192 { .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 512, },
1193 { .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 512, },
1194 { .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 512, },
1195 { .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 512, },
1196 { .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 256, },
1197 { .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 64, },
1198 { .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 256, },
1199 { .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 64, },
1200 { .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 256, },
1201 { .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 64, },
1202 { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, },
1203 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1204 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1205 };
1206
1207 /* mode 5 - fits in 8KB */
1208 static struct musb_fifo_cfg mode_5_cfg[] = {
1209 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1210 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1211 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1212 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1213 { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
1214 { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
1215 { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
1216 { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
1217 { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
1218 { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
1219 { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 32, },
1220 { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 32, },
1221 { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 32, },
1222 { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 32, },
1223 { .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 32, },
1224 { .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 32, },
1225 { .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 32, },
1226 { .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 32, },
1227 { .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 32, },
1228 { .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 32, },
1229 { .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 32, },
1230 { .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 32, },
1231 { .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 32, },
1232 { .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 32, },
1233 { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, },
1234 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1235 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1236 };
1237
1238 /*
1239 * configure a fifo; for non-shared endpoints, this may be called
1240 * once for a tx fifo and once for an rx fifo.
1241 *
1242 * returns negative errno or offset for next fifo.
1243 */
1244 static int
1245 fifo_setup(struct musb *musb, struct musb_hw_ep *hw_ep,
1246 const struct musb_fifo_cfg *cfg, u16 offset)
1247 {
1248 void __iomem *mbase = musb->mregs;
1249 int size = 0;
1250 u16 maxpacket = cfg->maxpacket;
1251 u16 c_off = offset >> 3;
1252 u8 c_size;
1253
1254 /* expect hw_ep has already been zero-initialized */
1255
1256 size = ffs(max(maxpacket, (u16) 8)) - 1;
1257 maxpacket = 1 << size;
1258
1259 c_size = size - 3;
1260 if (cfg->mode == BUF_DOUBLE) {
1261 if ((offset + (maxpacket << 1)) >
1262 (1 << (musb->config->ram_bits + 2)))
1263 return -EMSGSIZE;
1264 c_size |= MUSB_FIFOSZ_DPB;
1265 } else {
1266 if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2)))
1267 return -EMSGSIZE;
1268 }
1269
1270 /* configure the FIFO */
1271 musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum);
1272
1273 /* EP0 reserved endpoint for control, bidirectional;
1274 * EP1 reserved for bulk, two unidirectional halves.
1275 */
1276 if (hw_ep->epnum == 1)
1277 musb->bulk_ep = hw_ep;
1278 /* REVISIT error check: be sure ep0 can both rx and tx ... */
1279 switch (cfg->style) {
1280 case FIFO_TX:
1281 musb_writeb(mbase, MUSB_TXFIFOSZ, c_size);
1282 musb_writew(mbase, MUSB_TXFIFOADD, c_off);
1283 hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1284 hw_ep->max_packet_sz_tx = maxpacket;
1285 break;
1286 case FIFO_RX:
1287 musb_writeb(mbase, MUSB_RXFIFOSZ, c_size);
1288 musb_writew(mbase, MUSB_RXFIFOADD, c_off);
1289 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1290 hw_ep->max_packet_sz_rx = maxpacket;
1291 break;
1292 case FIFO_RXTX:
1293 musb_writeb(mbase, MUSB_TXFIFOSZ, c_size);
1294 musb_writew(mbase, MUSB_TXFIFOADD, c_off);
1295 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1296 hw_ep->max_packet_sz_rx = maxpacket;
1297
1298 musb_writeb(mbase, MUSB_RXFIFOSZ, c_size);
1299 musb_writew(mbase, MUSB_RXFIFOADD, c_off);
1300 hw_ep->tx_double_buffered = hw_ep->rx_double_buffered;
1301 hw_ep->max_packet_sz_tx = maxpacket;
1302
1303 hw_ep->is_shared_fifo = true;
1304 break;
1305 }
1306
1307 /* NOTE rx and tx endpoint irqs aren't managed separately,
1308 * which happens to be ok
1309 */
1310 musb->epmask |= (1 << hw_ep->epnum);
1311
1312 return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0));
1313 }
1314
1315 static struct musb_fifo_cfg ep0_cfg = {
1316 .style = FIFO_RXTX, .maxpacket = 64,
1317 };
1318
1319 static int ep_config_from_table(struct musb *musb)
1320 {
1321 const struct musb_fifo_cfg *cfg;
1322 unsigned i, n;
1323 int offset;
1324 struct musb_hw_ep *hw_ep = musb->endpoints;
1325
1326 if (musb->config->fifo_cfg) {
1327 cfg = musb->config->fifo_cfg;
1328 n = musb->config->fifo_cfg_size;
1329 goto done;
1330 }
1331
1332 switch (fifo_mode) {
1333 default:
1334 fifo_mode = 0;
1335 /* FALLTHROUGH */
1336 case 0:
1337 cfg = mode_0_cfg;
1338 n = ARRAY_SIZE(mode_0_cfg);
1339 break;
1340 case 1:
1341 cfg = mode_1_cfg;
1342 n = ARRAY_SIZE(mode_1_cfg);
1343 break;
1344 case 2:
1345 cfg = mode_2_cfg;
1346 n = ARRAY_SIZE(mode_2_cfg);
1347 break;
1348 case 3:
1349 cfg = mode_3_cfg;
1350 n = ARRAY_SIZE(mode_3_cfg);
1351 break;
1352 case 4:
1353 cfg = mode_4_cfg;
1354 n = ARRAY_SIZE(mode_4_cfg);
1355 break;
1356 case 5:
1357 cfg = mode_5_cfg;
1358 n = ARRAY_SIZE(mode_5_cfg);
1359 break;
1360 }
1361
1362 pr_debug("%s: setup fifo_mode %d\n", musb_driver_name, fifo_mode);
1363
1364
1365 done:
1366 offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0);
1367 /* assert(offset > 0) */
1368
1369 /* NOTE: for RTL versions >= 1.400 EPINFO and RAMINFO would
1370 * be better than static musb->config->num_eps and DYN_FIFO_SIZE...
1371 */
1372
1373 for (i = 0; i < n; i++) {
1374 u8 epn = cfg->hw_ep_num;
1375
1376 if (epn >= musb->config->num_eps) {
1377 pr_debug("%s: invalid ep %d\n",
1378 musb_driver_name, epn);
1379 return -EINVAL;
1380 }
1381 offset = fifo_setup(musb, hw_ep + epn, cfg++, offset);
1382 if (offset < 0) {
1383 pr_debug("%s: mem overrun, ep %d\n",
1384 musb_driver_name, epn);
1385 return offset;
1386 }
1387 epn++;
1388 musb->nr_endpoints = max(epn, musb->nr_endpoints);
1389 }
1390
1391 pr_debug("%s: %d/%d max ep, %d/%d memory\n",
1392 musb_driver_name,
1393 n + 1, musb->config->num_eps * 2 - 1,
1394 offset, (1 << (musb->config->ram_bits + 2)));
1395
1396 if (!musb->bulk_ep) {
1397 pr_debug("%s: missing bulk\n", musb_driver_name);
1398 return -EINVAL;
1399 }
1400
1401 return 0;
1402 }
1403
1404
1405 /*
1406 * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false
1407 * @param musb the controller
1408 */
1409 static int ep_config_from_hw(struct musb *musb)
1410 {
1411 u8 epnum = 0;
1412 struct musb_hw_ep *hw_ep;
1413 void __iomem *mbase = musb->mregs;
1414 int ret = 0;
1415
1416 musb_dbg(musb, "<== static silicon ep config");
1417
1418 /* FIXME pick up ep0 maxpacket size */
1419
1420 for (epnum = 1; epnum < musb->config->num_eps; epnum++) {
1421 musb_ep_select(mbase, epnum);
1422 hw_ep = musb->endpoints + epnum;
1423
1424 ret = musb_read_fifosize(musb, hw_ep, epnum);
1425 if (ret < 0)
1426 break;
1427
1428 /* FIXME set up hw_ep->{rx,tx}_double_buffered */
1429
1430 /* pick an RX/TX endpoint for bulk */
1431 if (hw_ep->max_packet_sz_tx < 512
1432 || hw_ep->max_packet_sz_rx < 512)
1433 continue;
1434
1435 /* REVISIT: this algorithm is lazy, we should at least
1436 * try to pick a double buffered endpoint.
1437 */
1438 if (musb->bulk_ep)
1439 continue;
1440 musb->bulk_ep = hw_ep;
1441 }
1442
1443 if (!musb->bulk_ep) {
1444 pr_debug("%s: missing bulk\n", musb_driver_name);
1445 return -EINVAL;
1446 }
1447
1448 return 0;
1449 }
1450
1451 enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, };
1452
1453 /* Initialize MUSB (M)HDRC part of the USB hardware subsystem;
1454 * configure endpoints, or take their config from silicon
1455 */
1456 static int musb_core_init(u16 musb_type, struct musb *musb)
1457 {
1458 u8 reg;
1459 char *type;
1460 char aInfo[90];
1461 void __iomem *mbase = musb->mregs;
1462 int status = 0;
1463 int i;
1464
1465 /* log core options (read using indexed model) */
1466 reg = musb_read_configdata(mbase);
1467
1468 strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8");
1469 if (reg & MUSB_CONFIGDATA_DYNFIFO) {
1470 strcat(aInfo, ", dyn FIFOs");
1471 musb->dyn_fifo = true;
1472 }
1473 if (reg & MUSB_CONFIGDATA_MPRXE) {
1474 strcat(aInfo, ", bulk combine");
1475 musb->bulk_combine = true;
1476 }
1477 if (reg & MUSB_CONFIGDATA_MPTXE) {
1478 strcat(aInfo, ", bulk split");
1479 musb->bulk_split = true;
1480 }
1481 if (reg & MUSB_CONFIGDATA_HBRXE) {
1482 strcat(aInfo, ", HB-ISO Rx");
1483 musb->hb_iso_rx = true;
1484 }
1485 if (reg & MUSB_CONFIGDATA_HBTXE) {
1486 strcat(aInfo, ", HB-ISO Tx");
1487 musb->hb_iso_tx = true;
1488 }
1489 if (reg & MUSB_CONFIGDATA_SOFTCONE)
1490 strcat(aInfo, ", SoftConn");
1491
1492 pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo);
1493
1494 if (MUSB_CONTROLLER_MHDRC == musb_type) {
1495 musb->is_multipoint = 1;
1496 type = "M";
1497 } else {
1498 musb->is_multipoint = 0;
1499 type = "";
1500 #ifndef CONFIG_USB_OTG_BLACKLIST_HUB
1501 pr_err("%s: kernel must blacklist external hubs\n",
1502 musb_driver_name);
1503 #endif
1504 }
1505
1506 /* log release info */
1507 musb->hwvers = musb_readw(mbase, MUSB_HWVERS);
1508 pr_debug("%s: %sHDRC RTL version %d.%d%s\n",
1509 musb_driver_name, type, MUSB_HWVERS_MAJOR(musb->hwvers),
1510 MUSB_HWVERS_MINOR(musb->hwvers),
1511 (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
1512
1513 /* configure ep0 */
1514 musb_configure_ep0(musb);
1515
1516 /* discover endpoint configuration */
1517 musb->nr_endpoints = 1;
1518 musb->epmask = 1;
1519
1520 if (musb->dyn_fifo)
1521 status = ep_config_from_table(musb);
1522 else
1523 status = ep_config_from_hw(musb);
1524
1525 if (status < 0)
1526 return status;
1527
1528 /* finish init, and print endpoint config */
1529 for (i = 0; i < musb->nr_endpoints; i++) {
1530 struct musb_hw_ep *hw_ep = musb->endpoints + i;
1531
1532 hw_ep->fifo = musb->io.fifo_offset(i) + mbase;
1533 #if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
1534 if (musb->ops->quirks & MUSB_IN_TUSB) {
1535 hw_ep->fifo_async = musb->async + 0x400 +
1536 musb->io.fifo_offset(i);
1537 hw_ep->fifo_sync = musb->sync + 0x400 +
1538 musb->io.fifo_offset(i);
1539 hw_ep->fifo_sync_va =
1540 musb->sync_va + 0x400 + musb->io.fifo_offset(i);
1541
1542 if (i == 0)
1543 hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF;
1544 else
1545 hw_ep->conf = mbase + 0x400 +
1546 (((i - 1) & 0xf) << 2);
1547 }
1548 #endif
1549
1550 hw_ep->regs = musb->io.ep_offset(i, 0) + mbase;
1551 hw_ep->rx_reinit = 1;
1552 hw_ep->tx_reinit = 1;
1553
1554 if (hw_ep->max_packet_sz_tx) {
1555 musb_dbg(musb, "%s: hw_ep %d%s, %smax %d",
1556 musb_driver_name, i,
1557 hw_ep->is_shared_fifo ? "shared" : "tx",
1558 hw_ep->tx_double_buffered
1559 ? "doublebuffer, " : "",
1560 hw_ep->max_packet_sz_tx);
1561 }
1562 if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) {
1563 musb_dbg(musb, "%s: hw_ep %d%s, %smax %d",
1564 musb_driver_name, i,
1565 "rx",
1566 hw_ep->rx_double_buffered
1567 ? "doublebuffer, " : "",
1568 hw_ep->max_packet_sz_rx);
1569 }
1570 if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx))
1571 musb_dbg(musb, "hw_ep %d not configured", i);
1572 }
1573
1574 return 0;
1575 }
1576
1577 /*-------------------------------------------------------------------------*/
1578
1579 /*
1580 * handle all the irqs defined by the HDRC core. for now we expect: other
1581 * irq sources (phy, dma, etc) will be handled first, musb->int_* values
1582 * will be assigned, and the irq will already have been acked.
1583 *
1584 * called in irq context with spinlock held, irqs blocked
1585 */
1586 irqreturn_t musb_interrupt(struct musb *musb)
1587 {
1588 irqreturn_t retval = IRQ_NONE;
1589 unsigned long status;
1590 unsigned long epnum;
1591 u8 devctl;
1592
1593 if (!musb->int_usb && !musb->int_tx && !musb->int_rx)
1594 return IRQ_NONE;
1595
1596 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1597
1598 trace_musb_isr(musb);
1599
1600 /**
1601 * According to Mentor Graphics' documentation, flowchart on page 98,
1602 * IRQ should be handled as follows:
1603 *
1604 * . Resume IRQ
1605 * . Session Request IRQ
1606 * . VBUS Error IRQ
1607 * . Suspend IRQ
1608 * . Connect IRQ
1609 * . Disconnect IRQ
1610 * . Reset/Babble IRQ
1611 * . SOF IRQ (we're not using this one)
1612 * . Endpoint 0 IRQ
1613 * . TX Endpoints
1614 * . RX Endpoints
1615 *
1616 * We will be following that flowchart in order to avoid any problems
1617 * that might arise with internal Finite State Machine.
1618 */
1619
1620 if (musb->int_usb)
1621 retval |= musb_stage0_irq(musb, musb->int_usb, devctl);
1622
1623 if (musb->int_tx & 1) {
1624 if (is_host_active(musb))
1625 retval |= musb_h_ep0_irq(musb);
1626 else
1627 retval |= musb_g_ep0_irq(musb);
1628
1629 /* we have just handled endpoint 0 IRQ, clear it */
1630 musb->int_tx &= ~BIT(0);
1631 }
1632
1633 status = musb->int_tx;
1634
1635 for_each_set_bit(epnum, &status, 16) {
1636 retval = IRQ_HANDLED;
1637 if (is_host_active(musb))
1638 musb_host_tx(musb, epnum);
1639 else
1640 musb_g_tx(musb, epnum);
1641 }
1642
1643 status = musb->int_rx;
1644
1645 for_each_set_bit(epnum, &status, 16) {
1646 retval = IRQ_HANDLED;
1647 if (is_host_active(musb))
1648 musb_host_rx(musb, epnum);
1649 else
1650 musb_g_rx(musb, epnum);
1651 }
1652
1653 return retval;
1654 }
1655 EXPORT_SYMBOL_GPL(musb_interrupt);
1656
1657 #ifndef CONFIG_MUSB_PIO_ONLY
1658 static bool use_dma = 1;
1659
1660 /* "modprobe ... use_dma=0" etc */
1661 module_param(use_dma, bool, 0644);
1662 MODULE_PARM_DESC(use_dma, "enable/disable use of DMA");
1663
1664 void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit)
1665 {
1666 /* called with controller lock already held */
1667
1668 if (!epnum) {
1669 if (!is_cppi_enabled(musb)) {
1670 /* endpoint 0 */
1671 if (is_host_active(musb))
1672 musb_h_ep0_irq(musb);
1673 else
1674 musb_g_ep0_irq(musb);
1675 }
1676 } else {
1677 /* endpoints 1..15 */
1678 if (transmit) {
1679 if (is_host_active(musb))
1680 musb_host_tx(musb, epnum);
1681 else
1682 musb_g_tx(musb, epnum);
1683 } else {
1684 /* receive */
1685 if (is_host_active(musb))
1686 musb_host_rx(musb, epnum);
1687 else
1688 musb_g_rx(musb, epnum);
1689 }
1690 }
1691 }
1692 EXPORT_SYMBOL_GPL(musb_dma_completion);
1693
1694 #else
1695 #define use_dma 0
1696 #endif
1697
1698 static int (*musb_phy_callback)(enum musb_vbus_id_status status);
1699
1700 /*
1701 * musb_mailbox - optional phy notifier function
1702 * @status phy state change
1703 *
1704 * Optionally gets called from the USB PHY. Note that the USB PHY must be
1705 * disabled at the point the phy_callback is registered or unregistered.
1706 */
1707 int musb_mailbox(enum musb_vbus_id_status status)
1708 {
1709 if (musb_phy_callback)
1710 return musb_phy_callback(status);
1711
1712 return -ENODEV;
1713 };
1714 EXPORT_SYMBOL_GPL(musb_mailbox);
1715
1716 /*-------------------------------------------------------------------------*/
1717
1718 static ssize_t
1719 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
1720 {
1721 struct musb *musb = dev_to_musb(dev);
1722 unsigned long flags;
1723 int ret = -EINVAL;
1724
1725 spin_lock_irqsave(&musb->lock, flags);
1726 ret = sprintf(buf, "%s\n", usb_otg_state_string(musb->xceiv->otg->state));
1727 spin_unlock_irqrestore(&musb->lock, flags);
1728
1729 return ret;
1730 }
1731
1732 static ssize_t
1733 mode_store(struct device *dev, struct device_attribute *attr,
1734 const char *buf, size_t n)
1735 {
1736 struct musb *musb = dev_to_musb(dev);
1737 unsigned long flags;
1738 int status;
1739
1740 spin_lock_irqsave(&musb->lock, flags);
1741 if (sysfs_streq(buf, "host"))
1742 status = musb_platform_set_mode(musb, MUSB_HOST);
1743 else if (sysfs_streq(buf, "peripheral"))
1744 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
1745 else if (sysfs_streq(buf, "otg"))
1746 status = musb_platform_set_mode(musb, MUSB_OTG);
1747 else
1748 status = -EINVAL;
1749 spin_unlock_irqrestore(&musb->lock, flags);
1750
1751 return (status == 0) ? n : status;
1752 }
1753 static DEVICE_ATTR_RW(mode);
1754
1755 static ssize_t
1756 vbus_store(struct device *dev, struct device_attribute *attr,
1757 const char *buf, size_t n)
1758 {
1759 struct musb *musb = dev_to_musb(dev);
1760 unsigned long flags;
1761 unsigned long val;
1762
1763 if (sscanf(buf, "%lu", &val) < 1) {
1764 dev_err(dev, "Invalid VBUS timeout ms value\n");
1765 return -EINVAL;
1766 }
1767
1768 spin_lock_irqsave(&musb->lock, flags);
1769 /* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
1770 musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
1771 if (musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)
1772 musb->is_active = 0;
1773 musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
1774 spin_unlock_irqrestore(&musb->lock, flags);
1775
1776 return n;
1777 }
1778
1779 static ssize_t
1780 vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
1781 {
1782 struct musb *musb = dev_to_musb(dev);
1783 unsigned long flags;
1784 unsigned long val;
1785 int vbus;
1786 u8 devctl;
1787
1788 pm_runtime_get_sync(dev);
1789 spin_lock_irqsave(&musb->lock, flags);
1790 val = musb->a_wait_bcon;
1791 vbus = musb_platform_get_vbus_status(musb);
1792 if (vbus < 0) {
1793 /* Use default MUSB method by means of DEVCTL register */
1794 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1795 if ((devctl & MUSB_DEVCTL_VBUS)
1796 == (3 << MUSB_DEVCTL_VBUS_SHIFT))
1797 vbus = 1;
1798 else
1799 vbus = 0;
1800 }
1801 spin_unlock_irqrestore(&musb->lock, flags);
1802 pm_runtime_put_sync(dev);
1803
1804 return sprintf(buf, "Vbus %s, timeout %lu msec\n",
1805 vbus ? "on" : "off", val);
1806 }
1807 static DEVICE_ATTR_RW(vbus);
1808
1809 /* Gadget drivers can't know that a host is connected so they might want
1810 * to start SRP, but users can. This allows userspace to trigger SRP.
1811 */
1812 static ssize_t srp_store(struct device *dev, struct device_attribute *attr,
1813 const char *buf, size_t n)
1814 {
1815 struct musb *musb = dev_to_musb(dev);
1816 unsigned short srp;
1817
1818 if (sscanf(buf, "%hu", &srp) != 1
1819 || (srp != 1)) {
1820 dev_err(dev, "SRP: Value must be 1\n");
1821 return -EINVAL;
1822 }
1823
1824 if (srp == 1)
1825 musb_g_wakeup(musb);
1826
1827 return n;
1828 }
1829 static DEVICE_ATTR_WO(srp);
1830
1831 static struct attribute *musb_attributes[] = {
1832 &dev_attr_mode.attr,
1833 &dev_attr_vbus.attr,
1834 &dev_attr_srp.attr,
1835 NULL
1836 };
1837
1838 static const struct attribute_group musb_attr_group = {
1839 .attrs = musb_attributes,
1840 };
1841
1842 #define MUSB_QUIRK_B_INVALID_VBUS_91 (MUSB_DEVCTL_BDEVICE | \
1843 (2 << MUSB_DEVCTL_VBUS_SHIFT) | \
1844 MUSB_DEVCTL_SESSION)
1845 #define MUSB_QUIRK_B_DISCONNECT_99 (MUSB_DEVCTL_BDEVICE | \
1846 (3 << MUSB_DEVCTL_VBUS_SHIFT) | \
1847 MUSB_DEVCTL_SESSION)
1848 #define MUSB_QUIRK_A_DISCONNECT_19 ((3 << MUSB_DEVCTL_VBUS_SHIFT) | \
1849 MUSB_DEVCTL_SESSION)
1850
1851 /*
1852 * Check the musb devctl session bit to determine if we want to
1853 * allow PM runtime for the device. In general, we want to keep things
1854 * active when the session bit is set except after host disconnect.
1855 *
1856 * Only called from musb_irq_work. If this ever needs to get called
1857 * elsewhere, proper locking must be implemented for musb->session.
1858 */
1859 static void musb_pm_runtime_check_session(struct musb *musb)
1860 {
1861 u8 devctl, s;
1862 int error;
1863
1864 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1865
1866 /* Handle session status quirks first */
1867 s = MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV |
1868 MUSB_DEVCTL_HR;
1869 switch (devctl & ~s) {
1870 case MUSB_QUIRK_B_DISCONNECT_99:
1871 musb_dbg(musb, "Poll devctl in case of suspend after disconnect\n");
1872 schedule_delayed_work(&musb->irq_work,
1873 msecs_to_jiffies(1000));
1874 break;
1875 case MUSB_QUIRK_B_INVALID_VBUS_91:
1876 if (musb->quirk_retries && !musb->flush_irq_work) {
1877 musb_dbg(musb,
1878 "Poll devctl on invalid vbus, assume no session");
1879 schedule_delayed_work(&musb->irq_work,
1880 msecs_to_jiffies(1000));
1881 musb->quirk_retries--;
1882 return;
1883 }
1884 /* fall through */
1885 case MUSB_QUIRK_A_DISCONNECT_19:
1886 if (musb->quirk_retries && !musb->flush_irq_work) {
1887 musb_dbg(musb,
1888 "Poll devctl on possible host mode disconnect");
1889 schedule_delayed_work(&musb->irq_work,
1890 msecs_to_jiffies(1000));
1891 musb->quirk_retries--;
1892 return;
1893 }
1894 if (!musb->session)
1895 break;
1896 musb_dbg(musb, "Allow PM on possible host mode disconnect");
1897 pm_runtime_mark_last_busy(musb->controller);
1898 pm_runtime_put_autosuspend(musb->controller);
1899 musb->session = false;
1900 return;
1901 default:
1902 break;
1903 }
1904
1905 /* No need to do anything if session has not changed */
1906 s = devctl & MUSB_DEVCTL_SESSION;
1907 if (s == musb->session)
1908 return;
1909
1910 /* Block PM or allow PM? */
1911 if (s) {
1912 musb_dbg(musb, "Block PM on active session: %02x", devctl);
1913 error = pm_runtime_get_sync(musb->controller);
1914 if (error < 0)
1915 dev_err(musb->controller, "Could not enable: %i\n",
1916 error);
1917 musb->quirk_retries = 3;
1918 } else {
1919 musb_dbg(musb, "Allow PM with no session: %02x", devctl);
1920 pm_runtime_mark_last_busy(musb->controller);
1921 pm_runtime_put_autosuspend(musb->controller);
1922 }
1923
1924 musb->session = s;
1925 }
1926
1927 /* Only used to provide driver mode change events */
1928 static void musb_irq_work(struct work_struct *data)
1929 {
1930 struct musb *musb = container_of(data, struct musb, irq_work.work);
1931 int error;
1932
1933 error = pm_runtime_get_sync(musb->controller);
1934 if (error < 0) {
1935 dev_err(musb->controller, "Could not enable: %i\n", error);
1936
1937 return;
1938 }
1939
1940 musb_pm_runtime_check_session(musb);
1941
1942 if (musb->xceiv->otg->state != musb->xceiv_old_state) {
1943 musb->xceiv_old_state = musb->xceiv->otg->state;
1944 sysfs_notify(&musb->controller->kobj, NULL, "mode");
1945 }
1946
1947 pm_runtime_mark_last_busy(musb->controller);
1948 pm_runtime_put_autosuspend(musb->controller);
1949 }
1950
1951 static void musb_recover_from_babble(struct musb *musb)
1952 {
1953 int ret;
1954 u8 devctl;
1955
1956 musb_disable_interrupts(musb);
1957
1958 /*
1959 * wait at least 320 cycles of 60MHz clock. That's 5.3us, we will give
1960 * it some slack and wait for 10us.
1961 */
1962 udelay(10);
1963
1964 ret = musb_platform_recover(musb);
1965 if (ret) {
1966 musb_enable_interrupts(musb);
1967 return;
1968 }
1969
1970 /* drop session bit */
1971 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1972 devctl &= ~MUSB_DEVCTL_SESSION;
1973 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
1974
1975 /* tell usbcore about it */
1976 musb_root_disconnect(musb);
1977
1978 /*
1979 * When a babble condition occurs, the musb controller
1980 * removes the session bit and the endpoint config is lost.
1981 */
1982 if (musb->dyn_fifo)
1983 ret = ep_config_from_table(musb);
1984 else
1985 ret = ep_config_from_hw(musb);
1986
1987 /* restart session */
1988 if (ret == 0)
1989 musb_start(musb);
1990 }
1991
1992 /* --------------------------------------------------------------------------
1993 * Init support
1994 */
1995
1996 static struct musb *allocate_instance(struct device *dev,
1997 const struct musb_hdrc_config *config, void __iomem *mbase)
1998 {
1999 struct musb *musb;
2000 struct musb_hw_ep *ep;
2001 int epnum;
2002 int ret;
2003
2004 musb = devm_kzalloc(dev, sizeof(*musb), GFP_KERNEL);
2005 if (!musb)
2006 return NULL;
2007
2008 INIT_LIST_HEAD(&musb->control);
2009 INIT_LIST_HEAD(&musb->in_bulk);
2010 INIT_LIST_HEAD(&musb->out_bulk);
2011 INIT_LIST_HEAD(&musb->pending_list);
2012
2013 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
2014 musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON;
2015 musb->mregs = mbase;
2016 musb->ctrl_base = mbase;
2017 musb->nIrq = -ENODEV;
2018 musb->config = config;
2019 BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS);
2020 for (epnum = 0, ep = musb->endpoints;
2021 epnum < musb->config->num_eps;
2022 epnum++, ep++) {
2023 ep->musb = musb;
2024 ep->epnum = epnum;
2025 }
2026
2027 musb->controller = dev;
2028
2029 ret = musb_host_alloc(musb);
2030 if (ret < 0)
2031 goto err_free;
2032
2033 dev_set_drvdata(dev, musb);
2034
2035 return musb;
2036
2037 err_free:
2038 return NULL;
2039 }
2040
2041 static void musb_free(struct musb *musb)
2042 {
2043 /* this has multiple entry modes. it handles fault cleanup after
2044 * probe(), where things may be partially set up, as well as rmmod
2045 * cleanup after everything's been de-activated.
2046 */
2047
2048 #ifdef CONFIG_SYSFS
2049 sysfs_remove_group(&musb->controller->kobj, &musb_attr_group);
2050 #endif
2051
2052 if (musb->nIrq >= 0) {
2053 if (musb->irq_wake)
2054 disable_irq_wake(musb->nIrq);
2055 free_irq(musb->nIrq, musb);
2056 }
2057
2058 musb_host_free(musb);
2059 }
2060
2061 struct musb_pending_work {
2062 int (*callback)(struct musb *musb, void *data);
2063 void *data;
2064 struct list_head node;
2065 };
2066
2067 #ifdef CONFIG_PM
2068 /*
2069 * Called from musb_runtime_resume(), musb_resume(), and
2070 * musb_queue_resume_work(). Callers must take musb->lock.
2071 */
2072 static int musb_run_resume_work(struct musb *musb)
2073 {
2074 struct musb_pending_work *w, *_w;
2075 unsigned long flags;
2076 int error = 0;
2077
2078 spin_lock_irqsave(&musb->list_lock, flags);
2079 list_for_each_entry_safe(w, _w, &musb->pending_list, node) {
2080 if (w->callback) {
2081 error = w->callback(musb, w->data);
2082 if (error < 0) {
2083 dev_err(musb->controller,
2084 "resume callback %p failed: %i\n",
2085 w->callback, error);
2086 }
2087 }
2088 list_del(&w->node);
2089 devm_kfree(musb->controller, w);
2090 }
2091 spin_unlock_irqrestore(&musb->list_lock, flags);
2092
2093 return error;
2094 }
2095 #endif
2096
2097 /*
2098 * Called to run work if device is active or else queue the work to happen
2099 * on resume. Caller must take musb->lock and must hold an RPM reference.
2100 *
2101 * Note that we cowardly refuse queuing work after musb PM runtime
2102 * resume is done calling musb_run_resume_work() and return -EINPROGRESS
2103 * instead.
2104 */
2105 int musb_queue_resume_work(struct musb *musb,
2106 int (*callback)(struct musb *musb, void *data),
2107 void *data)
2108 {
2109 struct musb_pending_work *w;
2110 unsigned long flags;
2111 int error;
2112
2113 if (WARN_ON(!callback))
2114 return -EINVAL;
2115
2116 if (pm_runtime_active(musb->controller))
2117 return callback(musb, data);
2118
2119 w = devm_kzalloc(musb->controller, sizeof(*w), GFP_ATOMIC);
2120 if (!w)
2121 return -ENOMEM;
2122
2123 w->callback = callback;
2124 w->data = data;
2125 spin_lock_irqsave(&musb->list_lock, flags);
2126 if (musb->is_runtime_suspended) {
2127 list_add_tail(&w->node, &musb->pending_list);
2128 error = 0;
2129 } else {
2130 dev_err(musb->controller, "could not add resume work %p\n",
2131 callback);
2132 devm_kfree(musb->controller, w);
2133 error = -EINPROGRESS;
2134 }
2135 spin_unlock_irqrestore(&musb->list_lock, flags);
2136
2137 return error;
2138 }
2139 EXPORT_SYMBOL_GPL(musb_queue_resume_work);
2140
2141 static void musb_deassert_reset(struct work_struct *work)
2142 {
2143 struct musb *musb;
2144 unsigned long flags;
2145
2146 musb = container_of(work, struct musb, deassert_reset_work.work);
2147
2148 spin_lock_irqsave(&musb->lock, flags);
2149
2150 if (musb->port1_status & USB_PORT_STAT_RESET)
2151 musb_port_reset(musb, false);
2152
2153 spin_unlock_irqrestore(&musb->lock, flags);
2154 }
2155
2156 /*
2157 * Perform generic per-controller initialization.
2158 *
2159 * @dev: the controller (already clocked, etc)
2160 * @nIrq: IRQ number
2161 * @ctrl: virtual address of controller registers,
2162 * not yet corrected for platform-specific offsets
2163 */
2164 static int
2165 musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
2166 {
2167 int status;
2168 struct musb *musb;
2169 struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
2170
2171 /* The driver might handle more features than the board; OK.
2172 * Fail when the board needs a feature that's not enabled.
2173 */
2174 if (!plat) {
2175 dev_err(dev, "no platform_data?\n");
2176 status = -ENODEV;
2177 goto fail0;
2178 }
2179
2180 /* allocate */
2181 musb = allocate_instance(dev, plat->config, ctrl);
2182 if (!musb) {
2183 status = -ENOMEM;
2184 goto fail0;
2185 }
2186
2187 spin_lock_init(&musb->lock);
2188 spin_lock_init(&musb->list_lock);
2189 musb->board_set_power = plat->set_power;
2190 musb->min_power = plat->min_power;
2191 musb->ops = plat->platform_ops;
2192 musb->port_mode = plat->mode;
2193
2194 /*
2195 * Initialize the default IO functions. At least omap2430 needs
2196 * these early. We initialize the platform specific IO functions
2197 * later on.
2198 */
2199 musb_readb = musb_default_readb;
2200 musb_writeb = musb_default_writeb;
2201 musb_readw = musb_default_readw;
2202 musb_writew = musb_default_writew;
2203
2204 /* The musb_platform_init() call:
2205 * - adjusts musb->mregs
2206 * - sets the musb->isr
2207 * - may initialize an integrated transceiver
2208 * - initializes musb->xceiv, usually by otg_get_phy()
2209 * - stops powering VBUS
2210 *
2211 * There are various transceiver configurations.
2212 * DaVinci, TUSB60x0, and others integrate them. OMAP3 uses
2213 * external/discrete ones in various flavors (twl4030 family,
2214 * isp1504, non-OTG, etc) mostly hooking up through ULPI.
2215 */
2216 status = musb_platform_init(musb);
2217 if (status < 0)
2218 goto fail1;
2219
2220 if (!musb->isr) {
2221 status = -ENODEV;
2222 goto fail2;
2223 }
2224
2225
2226 /* Most devices use indexed offset or flat offset */
2227 if (musb->ops->quirks & MUSB_INDEXED_EP) {
2228 musb->io.ep_offset = musb_indexed_ep_offset;
2229 musb->io.ep_select = musb_indexed_ep_select;
2230 } else {
2231 musb->io.ep_offset = musb_flat_ep_offset;
2232 musb->io.ep_select = musb_flat_ep_select;
2233 }
2234
2235 if (musb->ops->quirks & MUSB_G_NO_SKB_RESERVE)
2236 musb->g.quirk_avoids_skb_reserve = 1;
2237
2238 /* At least tusb6010 has its own offsets */
2239 if (musb->ops->ep_offset)
2240 musb->io.ep_offset = musb->ops->ep_offset;
2241 if (musb->ops->ep_select)
2242 musb->io.ep_select = musb->ops->ep_select;
2243
2244 if (musb->ops->fifo_mode)
2245 fifo_mode = musb->ops->fifo_mode;
2246 else
2247 fifo_mode = 4;
2248
2249 if (musb->ops->fifo_offset)
2250 musb->io.fifo_offset = musb->ops->fifo_offset;
2251 else
2252 musb->io.fifo_offset = musb_default_fifo_offset;
2253
2254 if (musb->ops->busctl_offset)
2255 musb->io.busctl_offset = musb->ops->busctl_offset;
2256 else
2257 musb->io.busctl_offset = musb_default_busctl_offset;
2258
2259 if (musb->ops->readb)
2260 musb_readb = musb->ops->readb;
2261 if (musb->ops->writeb)
2262 musb_writeb = musb->ops->writeb;
2263 if (musb->ops->readw)
2264 musb_readw = musb->ops->readw;
2265 if (musb->ops->writew)
2266 musb_writew = musb->ops->writew;
2267
2268 #ifndef CONFIG_MUSB_PIO_ONLY
2269 if (!musb->ops->dma_init || !musb->ops->dma_exit) {
2270 dev_err(dev, "DMA controller not set\n");
2271 status = -ENODEV;
2272 goto fail2;
2273 }
2274 musb_dma_controller_create = musb->ops->dma_init;
2275 musb_dma_controller_destroy = musb->ops->dma_exit;
2276 #endif
2277
2278 if (musb->ops->read_fifo)
2279 musb->io.read_fifo = musb->ops->read_fifo;
2280 else
2281 musb->io.read_fifo = musb_default_read_fifo;
2282
2283 if (musb->ops->write_fifo)
2284 musb->io.write_fifo = musb->ops->write_fifo;
2285 else
2286 musb->io.write_fifo = musb_default_write_fifo;
2287
2288 if (!musb->xceiv->io_ops) {
2289 musb->xceiv->io_dev = musb->controller;
2290 musb->xceiv->io_priv = musb->mregs;
2291 musb->xceiv->io_ops = &musb_ulpi_access;
2292 }
2293
2294 if (musb->ops->phy_callback)
2295 musb_phy_callback = musb->ops->phy_callback;
2296
2297 /*
2298 * We need musb_read/write functions initialized for PM.
2299 * Note that at least 2430 glue needs autosuspend delay
2300 * somewhere above 300 ms for the hardware to idle properly
2301 * after disconnecting the cable in host mode. Let's use
2302 * 500 ms for some margin.
2303 */
2304 pm_runtime_use_autosuspend(musb->controller);
2305 pm_runtime_set_autosuspend_delay(musb->controller, 500);
2306 pm_runtime_enable(musb->controller);
2307 pm_runtime_get_sync(musb->controller);
2308
2309 status = usb_phy_init(musb->xceiv);
2310 if (status < 0)
2311 goto err_usb_phy_init;
2312
2313 if (use_dma && dev->dma_mask) {
2314 musb->dma_controller =
2315 musb_dma_controller_create(musb, musb->mregs);
2316 if (IS_ERR(musb->dma_controller)) {
2317 status = PTR_ERR(musb->dma_controller);
2318 goto fail2_5;
2319 }
2320 }
2321
2322 /* be sure interrupts are disabled before connecting ISR */
2323 musb_platform_disable(musb);
2324 musb_disable_interrupts(musb);
2325 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
2326
2327 /* MUSB_POWER_SOFTCONN might be already set, JZ4740 does this. */
2328 musb_writeb(musb->mregs, MUSB_POWER, 0);
2329
2330 /* Init IRQ workqueue before request_irq */
2331 INIT_DELAYED_WORK(&musb->irq_work, musb_irq_work);
2332 INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
2333 INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume);
2334
2335 /* setup musb parts of the core (especially endpoints) */
2336 status = musb_core_init(plat->config->multipoint
2337 ? MUSB_CONTROLLER_MHDRC
2338 : MUSB_CONTROLLER_HDRC, musb);
2339 if (status < 0)
2340 goto fail3;
2341
2342 timer_setup(&musb->otg_timer, musb_otg_timer_func, 0);
2343
2344 /* attach to the IRQ */
2345 if (request_irq(nIrq, musb->isr, IRQF_SHARED, dev_name(dev), musb)) {
2346 dev_err(dev, "request_irq %d failed!\n", nIrq);
2347 status = -ENODEV;
2348 goto fail3;
2349 }
2350 musb->nIrq = nIrq;
2351 /* FIXME this handles wakeup irqs wrong */
2352 if (enable_irq_wake(nIrq) == 0) {
2353 musb->irq_wake = 1;
2354 device_init_wakeup(dev, 1);
2355 } else {
2356 musb->irq_wake = 0;
2357 }
2358
2359 /* program PHY to use external vBus if required */
2360 if (plat->extvbus) {
2361 u8 busctl = musb_readb(musb->mregs, MUSB_ULPI_BUSCONTROL);
2362 busctl |= MUSB_ULPI_USE_EXTVBUS;
2363 musb_writeb(musb->mregs, MUSB_ULPI_BUSCONTROL, busctl);
2364 }
2365
2366 MUSB_DEV_MODE(musb);
2367 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
2368
2369 switch (musb->port_mode) {
2370 case MUSB_HOST:
2371 status = musb_host_setup(musb, plat->power);
2372 if (status < 0)
2373 goto fail3;
2374 status = musb_platform_set_mode(musb, MUSB_HOST);
2375 break;
2376 case MUSB_PERIPHERAL:
2377 status = musb_gadget_setup(musb);
2378 if (status < 0)
2379 goto fail3;
2380 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
2381 break;
2382 case MUSB_OTG:
2383 status = musb_host_setup(musb, plat->power);
2384 if (status < 0)
2385 goto fail3;
2386 status = musb_gadget_setup(musb);
2387 if (status) {
2388 musb_host_cleanup(musb);
2389 goto fail3;
2390 }
2391 status = musb_platform_set_mode(musb, MUSB_OTG);
2392 break;
2393 default:
2394 dev_err(dev, "unsupported port mode %d\n", musb->port_mode);
2395 break;
2396 }
2397
2398 if (status < 0)
2399 goto fail3;
2400
2401 musb_init_debugfs(musb);
2402
2403 status = sysfs_create_group(&musb->controller->kobj, &musb_attr_group);
2404 if (status)
2405 goto fail5;
2406
2407 musb->is_initialized = 1;
2408 pm_runtime_mark_last_busy(musb->controller);
2409 pm_runtime_put_autosuspend(musb->controller);
2410
2411 return 0;
2412
2413 fail5:
2414 musb_exit_debugfs(musb);
2415
2416 musb_gadget_cleanup(musb);
2417 musb_host_cleanup(musb);
2418
2419 fail3:
2420 cancel_delayed_work_sync(&musb->irq_work);
2421 cancel_delayed_work_sync(&musb->finish_resume_work);
2422 cancel_delayed_work_sync(&musb->deassert_reset_work);
2423 if (musb->dma_controller)
2424 musb_dma_controller_destroy(musb->dma_controller);
2425
2426 fail2_5:
2427 usb_phy_shutdown(musb->xceiv);
2428
2429 err_usb_phy_init:
2430 pm_runtime_dont_use_autosuspend(musb->controller);
2431 pm_runtime_put_sync(musb->controller);
2432 pm_runtime_disable(musb->controller);
2433
2434 fail2:
2435 if (musb->irq_wake)
2436 device_init_wakeup(dev, 0);
2437 musb_platform_exit(musb);
2438
2439 fail1:
2440 if (status != -EPROBE_DEFER)
2441 dev_err(musb->controller,
2442 "%s failed with status %d\n", __func__, status);
2443
2444 musb_free(musb);
2445
2446 fail0:
2447
2448 return status;
2449
2450 }
2451
2452 /*-------------------------------------------------------------------------*/
2453
2454 /* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just
2455 * bridge to a platform device; this driver then suffices.
2456 */
2457 static int musb_probe(struct platform_device *pdev)
2458 {
2459 struct device *dev = &pdev->dev;
2460 int irq = platform_get_irq_byname(pdev, "mc");
2461 struct resource *iomem;
2462 void __iomem *base;
2463
2464 if (irq <= 0)
2465 return -ENODEV;
2466
2467 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2468 base = devm_ioremap_resource(dev, iomem);
2469 if (IS_ERR(base))
2470 return PTR_ERR(base);
2471
2472 return musb_init_controller(dev, irq, base);
2473 }
2474
2475 static int musb_remove(struct platform_device *pdev)
2476 {
2477 struct device *dev = &pdev->dev;
2478 struct musb *musb = dev_to_musb(dev);
2479 unsigned long flags;
2480
2481 /* this gets called on rmmod.
2482 * - Host mode: host may still be active
2483 * - Peripheral mode: peripheral is deactivated (or never-activated)
2484 * - OTG mode: both roles are deactivated (or never-activated)
2485 */
2486 musb_exit_debugfs(musb);
2487
2488 cancel_delayed_work_sync(&musb->irq_work);
2489 cancel_delayed_work_sync(&musb->finish_resume_work);
2490 cancel_delayed_work_sync(&musb->deassert_reset_work);
2491 pm_runtime_get_sync(musb->controller);
2492 musb_host_cleanup(musb);
2493 musb_gadget_cleanup(musb);
2494
2495 musb_platform_disable(musb);
2496 spin_lock_irqsave(&musb->lock, flags);
2497 musb_disable_interrupts(musb);
2498 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
2499 spin_unlock_irqrestore(&musb->lock, flags);
2500 musb_platform_exit(musb);
2501
2502 pm_runtime_dont_use_autosuspend(musb->controller);
2503 pm_runtime_put_sync(musb->controller);
2504 pm_runtime_disable(musb->controller);
2505 musb_phy_callback = NULL;
2506 if (musb->dma_controller)
2507 musb_dma_controller_destroy(musb->dma_controller);
2508 usb_phy_shutdown(musb->xceiv);
2509 musb_free(musb);
2510 device_init_wakeup(dev, 0);
2511 return 0;
2512 }
2513
2514 #ifdef CONFIG_PM
2515
2516 static void musb_save_context(struct musb *musb)
2517 {
2518 int i;
2519 void __iomem *musb_base = musb->mregs;
2520 void __iomem *epio;
2521
2522 musb->context.frame = musb_readw(musb_base, MUSB_FRAME);
2523 musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE);
2524 musb->context.busctl = musb_readb(musb_base, MUSB_ULPI_BUSCONTROL);
2525 musb->context.power = musb_readb(musb_base, MUSB_POWER);
2526 musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE);
2527 musb->context.index = musb_readb(musb_base, MUSB_INDEX);
2528 musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL);
2529
2530 for (i = 0; i < musb->config->num_eps; ++i) {
2531 struct musb_hw_ep *hw_ep;
2532
2533 hw_ep = &musb->endpoints[i];
2534 if (!hw_ep)
2535 continue;
2536
2537 epio = hw_ep->regs;
2538 if (!epio)
2539 continue;
2540
2541 musb_writeb(musb_base, MUSB_INDEX, i);
2542 musb->context.index_regs[i].txmaxp =
2543 musb_readw(epio, MUSB_TXMAXP);
2544 musb->context.index_regs[i].txcsr =
2545 musb_readw(epio, MUSB_TXCSR);
2546 musb->context.index_regs[i].rxmaxp =
2547 musb_readw(epio, MUSB_RXMAXP);
2548 musb->context.index_regs[i].rxcsr =
2549 musb_readw(epio, MUSB_RXCSR);
2550
2551 if (musb->dyn_fifo) {
2552 musb->context.index_regs[i].txfifoadd =
2553 musb_readw(musb_base, MUSB_TXFIFOADD);
2554 musb->context.index_regs[i].rxfifoadd =
2555 musb_readw(musb_base, MUSB_RXFIFOADD);
2556 musb->context.index_regs[i].txfifosz =
2557 musb_readb(musb_base, MUSB_TXFIFOSZ);
2558 musb->context.index_regs[i].rxfifosz =
2559 musb_readb(musb_base, MUSB_RXFIFOSZ);
2560 }
2561
2562 musb->context.index_regs[i].txtype =
2563 musb_readb(epio, MUSB_TXTYPE);
2564 musb->context.index_regs[i].txinterval =
2565 musb_readb(epio, MUSB_TXINTERVAL);
2566 musb->context.index_regs[i].rxtype =
2567 musb_readb(epio, MUSB_RXTYPE);
2568 musb->context.index_regs[i].rxinterval =
2569 musb_readb(epio, MUSB_RXINTERVAL);
2570
2571 musb->context.index_regs[i].txfunaddr =
2572 musb_read_txfunaddr(musb, i);
2573 musb->context.index_regs[i].txhubaddr =
2574 musb_read_txhubaddr(musb, i);
2575 musb->context.index_regs[i].txhubport =
2576 musb_read_txhubport(musb, i);
2577
2578 musb->context.index_regs[i].rxfunaddr =
2579 musb_read_rxfunaddr(musb, i);
2580 musb->context.index_regs[i].rxhubaddr =
2581 musb_read_rxhubaddr(musb, i);
2582 musb->context.index_regs[i].rxhubport =
2583 musb_read_rxhubport(musb, i);
2584 }
2585 }
2586
2587 static void musb_restore_context(struct musb *musb)
2588 {
2589 int i;
2590 void __iomem *musb_base = musb->mregs;
2591 void __iomem *epio;
2592 u8 power;
2593
2594 musb_writew(musb_base, MUSB_FRAME, musb->context.frame);
2595 musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode);
2596 musb_writeb(musb_base, MUSB_ULPI_BUSCONTROL, musb->context.busctl);
2597
2598 /* Don't affect SUSPENDM/RESUME bits in POWER reg */
2599 power = musb_readb(musb_base, MUSB_POWER);
2600 power &= MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME;
2601 musb->context.power &= ~(MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME);
2602 power |= musb->context.power;
2603 musb_writeb(musb_base, MUSB_POWER, power);
2604
2605 musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe);
2606 musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe);
2607 musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe);
2608 if (musb->context.devctl & MUSB_DEVCTL_SESSION)
2609 musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);
2610
2611 for (i = 0; i < musb->config->num_eps; ++i) {
2612 struct musb_hw_ep *hw_ep;
2613
2614 hw_ep = &musb->endpoints[i];
2615 if (!hw_ep)
2616 continue;
2617
2618 epio = hw_ep->regs;
2619 if (!epio)
2620 continue;
2621
2622 musb_writeb(musb_base, MUSB_INDEX, i);
2623 musb_writew(epio, MUSB_TXMAXP,
2624 musb->context.index_regs[i].txmaxp);
2625 musb_writew(epio, MUSB_TXCSR,
2626 musb->context.index_regs[i].txcsr);
2627 musb_writew(epio, MUSB_RXMAXP,
2628 musb->context.index_regs[i].rxmaxp);
2629 musb_writew(epio, MUSB_RXCSR,
2630 musb->context.index_regs[i].rxcsr);
2631
2632 if (musb->dyn_fifo) {
2633 musb_writeb(musb_base, MUSB_TXFIFOSZ,
2634 musb->context.index_regs[i].txfifosz);
2635 musb_writeb(musb_base, MUSB_RXFIFOSZ,
2636 musb->context.index_regs[i].rxfifosz);
2637 musb_writew(musb_base, MUSB_TXFIFOADD,
2638 musb->context.index_regs[i].txfifoadd);
2639 musb_writew(musb_base, MUSB_RXFIFOADD,
2640 musb->context.index_regs[i].rxfifoadd);
2641 }
2642
2643 musb_writeb(epio, MUSB_TXTYPE,
2644 musb->context.index_regs[i].txtype);
2645 musb_writeb(epio, MUSB_TXINTERVAL,
2646 musb->context.index_regs[i].txinterval);
2647 musb_writeb(epio, MUSB_RXTYPE,
2648 musb->context.index_regs[i].rxtype);
2649 musb_writeb(epio, MUSB_RXINTERVAL,
2650
2651 musb->context.index_regs[i].rxinterval);
2652 musb_write_txfunaddr(musb, i,
2653 musb->context.index_regs[i].txfunaddr);
2654 musb_write_txhubaddr(musb, i,
2655 musb->context.index_regs[i].txhubaddr);
2656 musb_write_txhubport(musb, i,
2657 musb->context.index_regs[i].txhubport);
2658
2659 musb_write_rxfunaddr(musb, i,
2660 musb->context.index_regs[i].rxfunaddr);
2661 musb_write_rxhubaddr(musb, i,
2662 musb->context.index_regs[i].rxhubaddr);
2663 musb_write_rxhubport(musb, i,
2664 musb->context.index_regs[i].rxhubport);
2665 }
2666 musb_writeb(musb_base, MUSB_INDEX, musb->context.index);
2667 }
2668
2669 static int musb_suspend(struct device *dev)
2670 {
2671 struct musb *musb = dev_to_musb(dev);
2672 unsigned long flags;
2673 int ret;
2674
2675 ret = pm_runtime_get_sync(dev);
2676 if (ret < 0) {
2677 pm_runtime_put_noidle(dev);
2678 return ret;
2679 }
2680
2681 musb_platform_disable(musb);
2682 musb_disable_interrupts(musb);
2683
2684 musb->flush_irq_work = true;
2685 while (flush_delayed_work(&musb->irq_work))
2686 ;
2687 musb->flush_irq_work = false;
2688
2689 if (!(musb->ops->quirks & MUSB_PRESERVE_SESSION))
2690 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
2691
2692 WARN_ON(!list_empty(&musb->pending_list));
2693
2694 spin_lock_irqsave(&musb->lock, flags);
2695
2696 if (is_peripheral_active(musb)) {
2697 /* FIXME force disconnect unless we know USB will wake
2698 * the system up quickly enough to respond ...
2699 */
2700 } else if (is_host_active(musb)) {
2701 /* we know all the children are suspended; sometimes
2702 * they will even be wakeup-enabled.
2703 */
2704 }
2705
2706 musb_save_context(musb);
2707
2708 spin_unlock_irqrestore(&musb->lock, flags);
2709 return 0;
2710 }
2711
2712 static int musb_resume(struct device *dev)
2713 {
2714 struct musb *musb = dev_to_musb(dev);
2715 unsigned long flags;
2716 int error;
2717 u8 devctl;
2718 u8 mask;
2719
2720 /*
2721 * For static cmos like DaVinci, register values were preserved
2722 * unless for some reason the whole soc powered down or the USB
2723 * module got reset through the PSC (vs just being disabled).
2724 *
2725 * For the DSPS glue layer though, a full register restore has to
2726 * be done. As it shouldn't harm other platforms, we do it
2727 * unconditionally.
2728 */
2729
2730 musb_restore_context(musb);
2731
2732 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2733 mask = MUSB_DEVCTL_BDEVICE | MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV;
2734 if ((devctl & mask) != (musb->context.devctl & mask))
2735 musb->port1_status = 0;
2736
2737 musb_enable_interrupts(musb);
2738 musb_platform_enable(musb);
2739
2740 /* session might be disabled in suspend */
2741 if (musb->port_mode == MUSB_HOST &&
2742 !(musb->ops->quirks & MUSB_PRESERVE_SESSION)) {
2743 devctl |= MUSB_DEVCTL_SESSION;
2744 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
2745 }
2746
2747 spin_lock_irqsave(&musb->lock, flags);
2748 error = musb_run_resume_work(musb);
2749 if (error)
2750 dev_err(musb->controller, "resume work failed with %i\n",
2751 error);
2752 spin_unlock_irqrestore(&musb->lock, flags);
2753
2754 pm_runtime_mark_last_busy(dev);
2755 pm_runtime_put_autosuspend(dev);
2756
2757 return 0;
2758 }
2759
2760 static int musb_runtime_suspend(struct device *dev)
2761 {
2762 struct musb *musb = dev_to_musb(dev);
2763
2764 musb_save_context(musb);
2765 musb->is_runtime_suspended = 1;
2766
2767 return 0;
2768 }
2769
2770 static int musb_runtime_resume(struct device *dev)
2771 {
2772 struct musb *musb = dev_to_musb(dev);
2773 unsigned long flags;
2774 int error;
2775
2776 /*
2777 * When pm_runtime_get_sync called for the first time in driver
2778 * init, some of the structure is still not initialized which is
2779 * used in restore function. But clock needs to be
2780 * enabled before any register access, so
2781 * pm_runtime_get_sync has to be called.
2782 * Also context restore without save does not make
2783 * any sense
2784 */
2785 if (!musb->is_initialized)
2786 return 0;
2787
2788 musb_restore_context(musb);
2789
2790 spin_lock_irqsave(&musb->lock, flags);
2791 error = musb_run_resume_work(musb);
2792 if (error)
2793 dev_err(musb->controller, "resume work failed with %i\n",
2794 error);
2795 musb->is_runtime_suspended = 0;
2796 spin_unlock_irqrestore(&musb->lock, flags);
2797
2798 return 0;
2799 }
2800
2801 static const struct dev_pm_ops musb_dev_pm_ops = {
2802 .suspend = musb_suspend,
2803 .resume = musb_resume,
2804 .runtime_suspend = musb_runtime_suspend,
2805 .runtime_resume = musb_runtime_resume,
2806 };
2807
2808 #define MUSB_DEV_PM_OPS (&musb_dev_pm_ops)
2809 #else
2810 #define MUSB_DEV_PM_OPS NULL
2811 #endif
2812
2813 static struct platform_driver musb_driver = {
2814 .driver = {
2815 .name = (char *)musb_driver_name,
2816 .bus = &platform_bus_type,
2817 .pm = MUSB_DEV_PM_OPS,
2818 },
2819 .probe = musb_probe,
2820 .remove = musb_remove,
2821 };
2822
2823 module_platform_driver(musb_driver);
Linux with added FPC-III support