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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/iopoll.h>
77#include <linux/dma-mapping.h>
78#include <linux/usb.h>
79#include <linux/usb/of.h>
80
81#include "musb_core.h"
82#include "musb_trace.h"
83
84#define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON)
85
86
87#define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia"
88#define DRIVER_DESC "Inventra Dual-Role USB Controller Driver"
89
90#define MUSB_VERSION "6.0"
91
92#define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION
93
94#define MUSB_DRIVER_NAME "musb-hdrc"
95const char musb_driver_name[] = MUSB_DRIVER_NAME;
96
97MODULE_DESCRIPTION(DRIVER_INFO);
98MODULE_AUTHOR(DRIVER_AUTHOR);
99MODULE_LICENSE("GPL");
100MODULE_ALIAS("platform:" MUSB_DRIVER_NAME);
101
102
103/*-------------------------------------------------------------------------*/
104
105static inline struct musb *dev_to_musb(struct device *dev)
106{
107 return dev_get_drvdata(dev);
108}
109
110enum musb_mode musb_get_mode(struct device *dev)
111{
112 enum usb_dr_mode mode;
113
114 mode = usb_get_dr_mode(dev);
115 switch (mode) {
116 case USB_DR_MODE_HOST:
117 return MUSB_HOST;
118 case USB_DR_MODE_PERIPHERAL:
119 return MUSB_PERIPHERAL;
120 case USB_DR_MODE_OTG:
121 case USB_DR_MODE_UNKNOWN:
122 default:
123 return MUSB_OTG;
124 }
125}
126EXPORT_SYMBOL_GPL(musb_get_mode);
127
128/*-------------------------------------------------------------------------*/
129
130static int musb_ulpi_read(struct usb_phy *phy, u32 reg)
131{
132 void __iomem *addr = phy->io_priv;
133 int i = 0;
134 u8 r;
135 u8 power;
136 int ret;
137
138 pm_runtime_get_sync(phy->io_dev);
139
140 /* Make sure the transceiver is not in low power mode */
141 power = musb_readb(addr, MUSB_POWER);
142 power &= ~MUSB_POWER_SUSPENDM;
143 musb_writeb(addr, MUSB_POWER, power);
144
145 /* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the
146 * ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM.
147 */
148
149 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
150 musb_writeb(addr, MUSB_ULPI_REG_CONTROL,
151 MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR);
152
153 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
154 & MUSB_ULPI_REG_CMPLT)) {
155 i++;
156 if (i == 10000) {
157 ret = -ETIMEDOUT;
158 goto out;
159 }
160
161 }
162 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
163 r &= ~MUSB_ULPI_REG_CMPLT;
164 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
165
166 ret = musb_readb(addr, MUSB_ULPI_REG_DATA);
167
168out:
169 pm_runtime_put(phy->io_dev);
170
171 return ret;
172}
173
174static int musb_ulpi_write(struct usb_phy *phy, u32 val, u32 reg)
175{
176 void __iomem *addr = phy->io_priv;
177 int i = 0;
178 u8 r = 0;
179 u8 power;
180 int ret = 0;
181
182 pm_runtime_get_sync(phy->io_dev);
183
184 /* Make sure the transceiver is not in low power mode */
185 power = musb_readb(addr, MUSB_POWER);
186 power &= ~MUSB_POWER_SUSPENDM;
187 musb_writeb(addr, MUSB_POWER, power);
188
189 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
190 musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)val);
191 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ);
192
193 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
194 & MUSB_ULPI_REG_CMPLT)) {
195 i++;
196 if (i == 10000) {
197 ret = -ETIMEDOUT;
198 goto out;
199 }
200 }
201
202 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
203 r &= ~MUSB_ULPI_REG_CMPLT;
204 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
205
206out:
207 pm_runtime_put(phy->io_dev);
208
209 return ret;
210}
211
212static struct usb_phy_io_ops musb_ulpi_access = {
213 .read = musb_ulpi_read,
214 .write = musb_ulpi_write,
215};
216
217/*-------------------------------------------------------------------------*/
218
219static u32 musb_default_fifo_offset(u8 epnum)
220{
221 return 0x20 + (epnum * 4);
222}
223
224/* "flat" mapping: each endpoint has its own i/o address */
225static void musb_flat_ep_select(void __iomem *mbase, u8 epnum)
226{
227}
228
229static u32 musb_flat_ep_offset(u8 epnum, u16 offset)
230{
231 return 0x100 + (0x10 * epnum) + offset;
232}
233
234/* "indexed" mapping: INDEX register controls register bank select */
235static void musb_indexed_ep_select(void __iomem *mbase, u8 epnum)
236{
237 musb_writeb(mbase, MUSB_INDEX, epnum);
238}
239
240static u32 musb_indexed_ep_offset(u8 epnum, u16 offset)
241{
242 return 0x10 + offset;
243}
244
245static u32 musb_default_busctl_offset(u8 epnum, u16 offset)
246{
247 return 0x80 + (0x08 * epnum) + offset;
248}
249
250static u8 musb_default_readb(void __iomem *addr, u32 offset)
251{
252 u8 data = __raw_readb(addr + offset);
253
254 trace_musb_readb(__builtin_return_address(0), addr, offset, data);
255 return data;
256}
257
258static void musb_default_writeb(void __iomem *addr, u32 offset, u8 data)
259{
260 trace_musb_writeb(__builtin_return_address(0), addr, offset, data);
261 __raw_writeb(data, addr + offset);
262}
263
264static u16 musb_default_readw(void __iomem *addr, u32 offset)
265{
266 u16 data = __raw_readw(addr + offset);
267
268 trace_musb_readw(__builtin_return_address(0), addr, offset, data);
269 return data;
270}
271
272static void musb_default_writew(void __iomem *addr, u32 offset, u16 data)
273{
274 trace_musb_writew(__builtin_return_address(0), addr, offset, data);
275 __raw_writew(data, addr + offset);
276}
277
278static u16 musb_default_get_toggle(struct musb_qh *qh, int is_out)
279{
280 void __iomem *epio = qh->hw_ep->regs;
281 u16 csr;
282
283 if (is_out)
284 csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
285 else
286 csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
287
288 return csr;
289}
290
291static u16 musb_default_set_toggle(struct musb_qh *qh, int is_out,
292 struct urb *urb)
293{
294 u16 csr;
295 u16 toggle;
296
297 toggle = usb_gettoggle(urb->dev, qh->epnum, is_out);
298
299 if (is_out)
300 csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
301 | MUSB_TXCSR_H_DATATOGGLE)
302 : MUSB_TXCSR_CLRDATATOG;
303 else
304 csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
305 | MUSB_RXCSR_H_DATATOGGLE) : 0;
306
307 return csr;
308}
309
310/*
311 * Load an endpoint's FIFO
312 */
313static void musb_default_write_fifo(struct musb_hw_ep *hw_ep, u16 len,
314 const u8 *src)
315{
316 struct musb *musb = hw_ep->musb;
317 void __iomem *fifo = hw_ep->fifo;
318
319 if (unlikely(len == 0))
320 return;
321
322 prefetch((u8 *)src);
323
324 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
325 'T', hw_ep->epnum, fifo, len, src);
326
327 /* we can't assume unaligned reads work */
328 if (likely((0x01 & (unsigned long) src) == 0)) {
329 u16 index = 0;
330
331 /* best case is 32bit-aligned source address */
332 if ((0x02 & (unsigned long) src) == 0) {
333 if (len >= 4) {
334 iowrite32_rep(fifo, src + index, len >> 2);
335 index += len & ~0x03;
336 }
337 if (len & 0x02) {
338 __raw_writew(*(u16 *)&src[index], fifo);
339 index += 2;
340 }
341 } else {
342 if (len >= 2) {
343 iowrite16_rep(fifo, src + index, len >> 1);
344 index += len & ~0x01;
345 }
346 }
347 if (len & 0x01)
348 __raw_writeb(src[index], fifo);
349 } else {
350 /* byte aligned */
351 iowrite8_rep(fifo, src, len);
352 }
353}
354
355/*
356 * Unload an endpoint's FIFO
357 */
358static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
359{
360 struct musb *musb = hw_ep->musb;
361 void __iomem *fifo = hw_ep->fifo;
362
363 if (unlikely(len == 0))
364 return;
365
366 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
367 'R', hw_ep->epnum, fifo, len, dst);
368
369 /* we can't assume unaligned writes work */
370 if (likely((0x01 & (unsigned long) dst) == 0)) {
371 u16 index = 0;
372
373 /* best case is 32bit-aligned destination address */
374 if ((0x02 & (unsigned long) dst) == 0) {
375 if (len >= 4) {
376 ioread32_rep(fifo, dst, len >> 2);
377 index = len & ~0x03;
378 }
379 if (len & 0x02) {
380 *(u16 *)&dst[index] = __raw_readw(fifo);
381 index += 2;
382 }
383 } else {
384 if (len >= 2) {
385 ioread16_rep(fifo, dst, len >> 1);
386 index = len & ~0x01;
387 }
388 }
389 if (len & 0x01)
390 dst[index] = __raw_readb(fifo);
391 } else {
392 /* byte aligned */
393 ioread8_rep(fifo, dst, len);
394 }
395}
396
397/*
398 * Old style IO functions
399 */
400u8 (*musb_readb)(void __iomem *addr, u32 offset);
401EXPORT_SYMBOL_GPL(musb_readb);
402
403void (*musb_writeb)(void __iomem *addr, u32 offset, u8 data);
404EXPORT_SYMBOL_GPL(musb_writeb);
405
406u8 (*musb_clearb)(void __iomem *addr, u32 offset);
407EXPORT_SYMBOL_GPL(musb_clearb);
408
409u16 (*musb_readw)(void __iomem *addr, u32 offset);
410EXPORT_SYMBOL_GPL(musb_readw);
411
412void (*musb_writew)(void __iomem *addr, u32 offset, u16 data);
413EXPORT_SYMBOL_GPL(musb_writew);
414
415u16 (*musb_clearw)(void __iomem *addr, u32 offset);
416EXPORT_SYMBOL_GPL(musb_clearw);
417
418u32 musb_readl(void __iomem *addr, u32 offset)
419{
420 u32 data = __raw_readl(addr + offset);
421
422 trace_musb_readl(__builtin_return_address(0), addr, offset, data);
423 return data;
424}
425EXPORT_SYMBOL_GPL(musb_readl);
426
427void musb_writel(void __iomem *addr, u32 offset, u32 data)
428{
429 trace_musb_writel(__builtin_return_address(0), addr, offset, data);
430 __raw_writel(data, addr + offset);
431}
432EXPORT_SYMBOL_GPL(musb_writel);
433
434#ifndef CONFIG_MUSB_PIO_ONLY
435struct dma_controller *
436(*musb_dma_controller_create)(struct musb *musb, void __iomem *base);
437EXPORT_SYMBOL(musb_dma_controller_create);
438
439void (*musb_dma_controller_destroy)(struct dma_controller *c);
440EXPORT_SYMBOL(musb_dma_controller_destroy);
441#endif
442
443/*
444 * New style IO functions
445 */
446void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
447{
448 return hw_ep->musb->io.read_fifo(hw_ep, len, dst);
449}
450
451void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
452{
453 return hw_ep->musb->io.write_fifo(hw_ep, len, src);
454}
455
456static u8 musb_read_devctl(struct musb *musb)
457{
458 return musb_readb(musb->mregs, MUSB_DEVCTL);
459}
460
461/**
462 * musb_set_host - set and initialize host mode
463 * @musb: musb controller driver data
464 *
465 * At least some musb revisions need to enable devctl session bit in
466 * peripheral mode to switch to host mode. Initializes things to host
467 * mode and sets A_IDLE. SoC glue needs to advance state further
468 * based on phy provided VBUS state.
469 *
470 * Note that the SoC glue code may need to wait for musb to settle
471 * on enable before calling this to avoid babble.
472 */
473int musb_set_host(struct musb *musb)
474{
475 int error = 0;
476 u8 devctl;
477
478 if (!musb)
479 return -EINVAL;
480
481 devctl = musb_read_devctl(musb);
482 if (!(devctl & MUSB_DEVCTL_BDEVICE)) {
483 trace_musb_state(musb, devctl, "Already in host mode");
484 goto init_data;
485 }
486
487 devctl |= MUSB_DEVCTL_SESSION;
488 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
489
490 error = readx_poll_timeout(musb_read_devctl, musb, devctl,
491 !(devctl & MUSB_DEVCTL_BDEVICE), 5000,
492 1000000);
493 if (error) {
494 dev_err(musb->controller, "%s: could not set host: %02x\n",
495 __func__, devctl);
496
497 return error;
498 }
499
500 devctl = musb_read_devctl(musb);
501 trace_musb_state(musb, devctl, "Host mode set");
502
503init_data:
504 musb->is_active = 1;
505 musb_set_state(musb, OTG_STATE_A_IDLE);
506 MUSB_HST_MODE(musb);
507
508 return error;
509}
510EXPORT_SYMBOL_GPL(musb_set_host);
511
512/**
513 * musb_set_peripheral - set and initialize peripheral mode
514 * @musb: musb controller driver data
515 *
516 * Clears devctl session bit and initializes things for peripheral
517 * mode and sets B_IDLE. SoC glue needs to advance state further
518 * based on phy provided VBUS state.
519 */
520int musb_set_peripheral(struct musb *musb)
521{
522 int error = 0;
523 u8 devctl;
524
525 if (!musb)
526 return -EINVAL;
527
528 devctl = musb_read_devctl(musb);
529 if (devctl & MUSB_DEVCTL_BDEVICE) {
530 trace_musb_state(musb, devctl, "Already in peripheral mode");
531 goto init_data;
532 }
533
534 devctl &= ~MUSB_DEVCTL_SESSION;
535 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
536
537 error = readx_poll_timeout(musb_read_devctl, musb, devctl,
538 devctl & MUSB_DEVCTL_BDEVICE, 5000,
539 1000000);
540 if (error) {
541 dev_err(musb->controller, "%s: could not set peripheral: %02x\n",
542 __func__, devctl);
543
544 return error;
545 }
546
547 devctl = musb_read_devctl(musb);
548 trace_musb_state(musb, devctl, "Peripheral mode set");
549
550init_data:
551 musb->is_active = 0;
552 musb_set_state(musb, OTG_STATE_B_IDLE);
553 MUSB_DEV_MODE(musb);
554
555 return error;
556}
557EXPORT_SYMBOL_GPL(musb_set_peripheral);
558
559/*-------------------------------------------------------------------------*/
560
561/* for high speed test mode; see USB 2.0 spec 7.1.20 */
562static const u8 musb_test_packet[53] = {
563 /* implicit SYNC then DATA0 to start */
564
565 /* JKJKJKJK x9 */
566 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
567 /* JJKKJJKK x8 */
568 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
569 /* JJJJKKKK x8 */
570 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
571 /* JJJJJJJKKKKKKK x8 */
572 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
573 /* JJJJJJJK x8 */
574 0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd,
575 /* JKKKKKKK x10, JK */
576 0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e
577
578 /* implicit CRC16 then EOP to end */
579};
580
581void musb_load_testpacket(struct musb *musb)
582{
583 void __iomem *regs = musb->endpoints[0].regs;
584
585 musb_ep_select(musb->mregs, 0);
586 musb_write_fifo(musb->control_ep,
587 sizeof(musb_test_packet), musb_test_packet);
588 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY);
589}
590
591/*-------------------------------------------------------------------------*/
592
593/*
594 * Handles OTG hnp timeouts, such as b_ase0_brst
595 */
596static void musb_otg_timer_func(struct timer_list *t)
597{
598 struct musb *musb = from_timer(musb, t, otg_timer);
599 unsigned long flags;
600
601 spin_lock_irqsave(&musb->lock, flags);
602 switch (musb_get_state(musb)) {
603 case OTG_STATE_B_WAIT_ACON:
604 musb_dbg(musb,
605 "HNP: b_wait_acon timeout; back to b_peripheral");
606 musb_g_disconnect(musb);
607 musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
608 musb->is_active = 0;
609 break;
610 case OTG_STATE_A_SUSPEND:
611 case OTG_STATE_A_WAIT_BCON:
612 musb_dbg(musb, "HNP: %s timeout",
613 musb_otg_state_string(musb));
614 musb_platform_set_vbus(musb, 0);
615 musb_set_state(musb, OTG_STATE_A_WAIT_VFALL);
616 break;
617 default:
618 musb_dbg(musb, "HNP: Unhandled mode %s",
619 musb_otg_state_string(musb));
620 }
621 spin_unlock_irqrestore(&musb->lock, flags);
622}
623
624/*
625 * Stops the HNP transition. Caller must take care of locking.
626 */
627void musb_hnp_stop(struct musb *musb)
628{
629 struct usb_hcd *hcd = musb->hcd;
630 void __iomem *mbase = musb->mregs;
631 u8 reg;
632
633 musb_dbg(musb, "HNP: stop from %s", musb_otg_state_string(musb));
634
635 switch (musb_get_state(musb)) {
636 case OTG_STATE_A_PERIPHERAL:
637 musb_g_disconnect(musb);
638 musb_dbg(musb, "HNP: back to %s", musb_otg_state_string(musb));
639 break;
640 case OTG_STATE_B_HOST:
641 musb_dbg(musb, "HNP: Disabling HR");
642 if (hcd)
643 hcd->self.is_b_host = 0;
644 musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
645 MUSB_DEV_MODE(musb);
646 reg = musb_readb(mbase, MUSB_POWER);
647 reg |= MUSB_POWER_SUSPENDM;
648 musb_writeb(mbase, MUSB_POWER, reg);
649 /* REVISIT: Start SESSION_REQUEST here? */
650 break;
651 default:
652 musb_dbg(musb, "HNP: Stopping in unknown state %s",
653 musb_otg_state_string(musb));
654 }
655
656 /*
657 * When returning to A state after HNP, avoid hub_port_rebounce(),
658 * which cause occasional OPT A "Did not receive reset after connect"
659 * errors.
660 */
661 musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16);
662}
663
664static void musb_recover_from_babble(struct musb *musb);
665
666static void musb_handle_intr_resume(struct musb *musb, u8 devctl)
667{
668 musb_dbg(musb, "RESUME (%s)", musb_otg_state_string(musb));
669
670 if (devctl & MUSB_DEVCTL_HM) {
671 switch (musb_get_state(musb)) {
672 case OTG_STATE_A_SUSPEND:
673 /* remote wakeup? */
674 musb->port1_status |=
675 (USB_PORT_STAT_C_SUSPEND << 16)
676 | MUSB_PORT_STAT_RESUME;
677 musb->rh_timer = jiffies
678 + msecs_to_jiffies(USB_RESUME_TIMEOUT);
679 musb_set_state(musb, OTG_STATE_A_HOST);
680 musb->is_active = 1;
681 musb_host_resume_root_hub(musb);
682 schedule_delayed_work(&musb->finish_resume_work,
683 msecs_to_jiffies(USB_RESUME_TIMEOUT));
684 break;
685 case OTG_STATE_B_WAIT_ACON:
686 musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
687 musb->is_active = 1;
688 MUSB_DEV_MODE(musb);
689 break;
690 default:
691 WARNING("bogus %s RESUME (%s)\n",
692 "host",
693 musb_otg_state_string(musb));
694 }
695 } else {
696 switch (musb_get_state(musb)) {
697 case OTG_STATE_A_SUSPEND:
698 /* possibly DISCONNECT is upcoming */
699 musb_set_state(musb, OTG_STATE_A_HOST);
700 musb_host_resume_root_hub(musb);
701 break;
702 case OTG_STATE_B_WAIT_ACON:
703 case OTG_STATE_B_PERIPHERAL:
704 /* disconnect while suspended? we may
705 * not get a disconnect irq...
706 */
707 if ((devctl & MUSB_DEVCTL_VBUS)
708 != (3 << MUSB_DEVCTL_VBUS_SHIFT)
709 ) {
710 musb->int_usb |= MUSB_INTR_DISCONNECT;
711 musb->int_usb &= ~MUSB_INTR_SUSPEND;
712 break;
713 }
714 musb_g_resume(musb);
715 break;
716 case OTG_STATE_B_IDLE:
717 musb->int_usb &= ~MUSB_INTR_SUSPEND;
718 break;
719 default:
720 WARNING("bogus %s RESUME (%s)\n",
721 "peripheral",
722 musb_otg_state_string(musb));
723 }
724 }
725}
726
727/* return IRQ_HANDLED to tell the caller to return immediately */
728static irqreturn_t musb_handle_intr_sessreq(struct musb *musb, u8 devctl)
729{
730 void __iomem *mbase = musb->mregs;
731
732 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS
733 && (devctl & MUSB_DEVCTL_BDEVICE)) {
734 musb_dbg(musb, "SessReq while on B state");
735 return IRQ_HANDLED;
736 }
737
738 musb_dbg(musb, "SESSION_REQUEST (%s)", musb_otg_state_string(musb));
739
740 /* IRQ arrives from ID pin sense or (later, if VBUS power
741 * is removed) SRP. responses are time critical:
742 * - turn on VBUS (with silicon-specific mechanism)
743 * - go through A_WAIT_VRISE
744 * - ... to A_WAIT_BCON.
745 * a_wait_vrise_tmout triggers VBUS_ERROR transitions
746 */
747 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
748 musb->ep0_stage = MUSB_EP0_START;
749 musb_set_state(musb, OTG_STATE_A_IDLE);
750 MUSB_HST_MODE(musb);
751 musb_platform_set_vbus(musb, 1);
752
753 return IRQ_NONE;
754}
755
756static void musb_handle_intr_vbuserr(struct musb *musb, u8 devctl)
757{
758 int ignore = 0;
759
760 /* During connection as an A-Device, we may see a short
761 * current spikes causing voltage drop, because of cable
762 * and peripheral capacitance combined with vbus draw.
763 * (So: less common with truly self-powered devices, where
764 * vbus doesn't act like a power supply.)
765 *
766 * Such spikes are short; usually less than ~500 usec, max
767 * of ~2 msec. That is, they're not sustained overcurrent
768 * errors, though they're reported using VBUSERROR irqs.
769 *
770 * Workarounds: (a) hardware: use self powered devices.
771 * (b) software: ignore non-repeated VBUS errors.
772 *
773 * REVISIT: do delays from lots of DEBUG_KERNEL checks
774 * make trouble here, keeping VBUS < 4.4V ?
775 */
776 switch (musb_get_state(musb)) {
777 case OTG_STATE_A_HOST:
778 /* recovery is dicey once we've gotten past the
779 * initial stages of enumeration, but if VBUS
780 * stayed ok at the other end of the link, and
781 * another reset is due (at least for high speed,
782 * to redo the chirp etc), it might work OK...
783 */
784 case OTG_STATE_A_WAIT_BCON:
785 case OTG_STATE_A_WAIT_VRISE:
786 if (musb->vbuserr_retry) {
787 void __iomem *mbase = musb->mregs;
788
789 musb->vbuserr_retry--;
790 ignore = 1;
791 devctl |= MUSB_DEVCTL_SESSION;
792 musb_writeb(mbase, MUSB_DEVCTL, devctl);
793 } else {
794 musb->port1_status |=
795 USB_PORT_STAT_OVERCURRENT
796 | (USB_PORT_STAT_C_OVERCURRENT << 16);
797 }
798 break;
799 default:
800 break;
801 }
802
803 dev_printk(ignore ? KERN_DEBUG : KERN_ERR, musb->controller,
804 "VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n",
805 musb_otg_state_string(musb),
806 devctl,
807 ({ char *s;
808 switch (devctl & MUSB_DEVCTL_VBUS) {
809 case 0 << MUSB_DEVCTL_VBUS_SHIFT:
810 s = "<SessEnd"; break;
811 case 1 << MUSB_DEVCTL_VBUS_SHIFT:
812 s = "<AValid"; break;
813 case 2 << MUSB_DEVCTL_VBUS_SHIFT:
814 s = "<VBusValid"; break;
815 /* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */
816 default:
817 s = "VALID"; break;
818 } s; }),
819 VBUSERR_RETRY_COUNT - musb->vbuserr_retry,
820 musb->port1_status);
821
822 /* go through A_WAIT_VFALL then start a new session */
823 if (!ignore)
824 musb_platform_set_vbus(musb, 0);
825}
826
827static void musb_handle_intr_suspend(struct musb *musb, u8 devctl)
828{
829 musb_dbg(musb, "SUSPEND (%s) devctl %02x",
830 musb_otg_state_string(musb), devctl);
831
832 switch (musb_get_state(musb)) {
833 case OTG_STATE_A_PERIPHERAL:
834 /* We also come here if the cable is removed, since
835 * this silicon doesn't report ID-no-longer-grounded.
836 *
837 * We depend on T(a_wait_bcon) to shut us down, and
838 * hope users don't do anything dicey during this
839 * undesired detour through A_WAIT_BCON.
840 */
841 musb_hnp_stop(musb);
842 musb_host_resume_root_hub(musb);
843 musb_root_disconnect(musb);
844 musb_platform_try_idle(musb, jiffies
845 + msecs_to_jiffies(musb->a_wait_bcon
846 ? : OTG_TIME_A_WAIT_BCON));
847
848 break;
849 case OTG_STATE_B_IDLE:
850 if (!musb->is_active)
851 break;
852 fallthrough;
853 case OTG_STATE_B_PERIPHERAL:
854 musb_g_suspend(musb);
855 musb->is_active = musb->g.b_hnp_enable;
856 if (musb->is_active) {
857 musb_set_state(musb, OTG_STATE_B_WAIT_ACON);
858 musb_dbg(musb, "HNP: Setting timer for b_ase0_brst");
859 mod_timer(&musb->otg_timer, jiffies
860 + msecs_to_jiffies(
861 OTG_TIME_B_ASE0_BRST));
862 }
863 break;
864 case OTG_STATE_A_WAIT_BCON:
865 if (musb->a_wait_bcon != 0)
866 musb_platform_try_idle(musb, jiffies
867 + msecs_to_jiffies(musb->a_wait_bcon));
868 break;
869 case OTG_STATE_A_HOST:
870 musb_set_state(musb, OTG_STATE_A_SUSPEND);
871 musb->is_active = musb->hcd->self.b_hnp_enable;
872 break;
873 case OTG_STATE_B_HOST:
874 /* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */
875 musb_dbg(musb, "REVISIT: SUSPEND as B_HOST");
876 break;
877 default:
878 /* "should not happen" */
879 musb->is_active = 0;
880 break;
881 }
882}
883
884static void musb_handle_intr_connect(struct musb *musb, u8 devctl, u8 int_usb)
885{
886 struct usb_hcd *hcd = musb->hcd;
887
888 musb->is_active = 1;
889 musb->ep0_stage = MUSB_EP0_START;
890
891 musb->intrtxe = musb->epmask;
892 musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe);
893 musb->intrrxe = musb->epmask & 0xfffe;
894 musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe);
895 musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7);
896 musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED
897 |USB_PORT_STAT_HIGH_SPEED
898 |USB_PORT_STAT_ENABLE
899 );
900 musb->port1_status |= USB_PORT_STAT_CONNECTION
901 |(USB_PORT_STAT_C_CONNECTION << 16);
902
903 /* high vs full speed is just a guess until after reset */
904 if (devctl & MUSB_DEVCTL_LSDEV)
905 musb->port1_status |= USB_PORT_STAT_LOW_SPEED;
906
907 /* indicate new connection to OTG machine */
908 switch (musb_get_state(musb)) {
909 case OTG_STATE_B_PERIPHERAL:
910 if (int_usb & MUSB_INTR_SUSPEND) {
911 musb_dbg(musb, "HNP: SUSPEND+CONNECT, now b_host");
912 int_usb &= ~MUSB_INTR_SUSPEND;
913 goto b_host;
914 } else
915 musb_dbg(musb, "CONNECT as b_peripheral???");
916 break;
917 case OTG_STATE_B_WAIT_ACON:
918 musb_dbg(musb, "HNP: CONNECT, now b_host");
919b_host:
920 musb_set_state(musb, OTG_STATE_B_HOST);
921 if (musb->hcd)
922 musb->hcd->self.is_b_host = 1;
923 del_timer(&musb->otg_timer);
924 break;
925 default:
926 if ((devctl & MUSB_DEVCTL_VBUS)
927 == (3 << MUSB_DEVCTL_VBUS_SHIFT)) {
928 musb_set_state(musb, OTG_STATE_A_HOST);
929 if (hcd)
930 hcd->self.is_b_host = 0;
931 }
932 break;
933 }
934
935 musb_host_poke_root_hub(musb);
936
937 musb_dbg(musb, "CONNECT (%s) devctl %02x",
938 musb_otg_state_string(musb), devctl);
939}
940
941static void musb_handle_intr_disconnect(struct musb *musb, u8 devctl)
942{
943 musb_dbg(musb, "DISCONNECT (%s) as %s, devctl %02x",
944 musb_otg_state_string(musb),
945 MUSB_MODE(musb), devctl);
946
947 switch (musb_get_state(musb)) {
948 case OTG_STATE_A_HOST:
949 case OTG_STATE_A_SUSPEND:
950 musb_host_resume_root_hub(musb);
951 musb_root_disconnect(musb);
952 if (musb->a_wait_bcon != 0)
953 musb_platform_try_idle(musb, jiffies
954 + msecs_to_jiffies(musb->a_wait_bcon));
955 break;
956 case OTG_STATE_B_HOST:
957 /* REVISIT this behaves for "real disconnect"
958 * cases; make sure the other transitions from
959 * from B_HOST act right too. The B_HOST code
960 * in hnp_stop() is currently not used...
961 */
962 musb_root_disconnect(musb);
963 if (musb->hcd)
964 musb->hcd->self.is_b_host = 0;
965 musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
966 MUSB_DEV_MODE(musb);
967 musb_g_disconnect(musb);
968 break;
969 case OTG_STATE_A_PERIPHERAL:
970 musb_hnp_stop(musb);
971 musb_root_disconnect(musb);
972 fallthrough;
973 case OTG_STATE_B_WAIT_ACON:
974 case OTG_STATE_B_PERIPHERAL:
975 case OTG_STATE_B_IDLE:
976 musb_g_disconnect(musb);
977 break;
978 default:
979 WARNING("unhandled DISCONNECT transition (%s)\n",
980 musb_otg_state_string(musb));
981 break;
982 }
983}
984
985/*
986 * mentor saves a bit: bus reset and babble share the same irq.
987 * only host sees babble; only peripheral sees bus reset.
988 */
989static void musb_handle_intr_reset(struct musb *musb)
990{
991 if (is_host_active(musb)) {
992 /*
993 * When BABBLE happens what we can depends on which
994 * platform MUSB is running, because some platforms
995 * implemented proprietary means for 'recovering' from
996 * Babble conditions. One such platform is AM335x. In
997 * most cases, however, the only thing we can do is
998 * drop the session.
999 */
1000 dev_err(musb->controller, "Babble\n");
1001 musb_recover_from_babble(musb);
1002 } else {
1003 musb_dbg(musb, "BUS RESET as %s", musb_otg_state_string(musb));
1004 switch (musb_get_state(musb)) {
1005 case OTG_STATE_A_SUSPEND:
1006 musb_g_reset(musb);
1007 fallthrough;
1008 case OTG_STATE_A_WAIT_BCON: /* OPT TD.4.7-900ms */
1009 /* never use invalid T(a_wait_bcon) */
1010 musb_dbg(musb, "HNP: in %s, %d msec timeout",
1011 musb_otg_state_string(musb),
1012 TA_WAIT_BCON(musb));
1013 mod_timer(&musb->otg_timer, jiffies
1014 + msecs_to_jiffies(TA_WAIT_BCON(musb)));
1015 break;
1016 case OTG_STATE_A_PERIPHERAL:
1017 del_timer(&musb->otg_timer);
1018 musb_g_reset(musb);
1019 break;
1020 case OTG_STATE_B_WAIT_ACON:
1021 musb_dbg(musb, "HNP: RESET (%s), to b_peripheral",
1022 musb_otg_state_string(musb));
1023 musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
1024 musb_g_reset(musb);
1025 break;
1026 case OTG_STATE_B_IDLE:
1027 musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
1028 fallthrough;
1029 case OTG_STATE_B_PERIPHERAL:
1030 musb_g_reset(musb);
1031 break;
1032 default:
1033 musb_dbg(musb, "Unhandled BUS RESET as %s",
1034 musb_otg_state_string(musb));
1035 }
1036 }
1037}
1038
1039/*
1040 * Interrupt Service Routine to record USB "global" interrupts.
1041 * Since these do not happen often and signify things of
1042 * paramount importance, it seems OK to check them individually;
1043 * the order of the tests is specified in the manual
1044 *
1045 * @param musb instance pointer
1046 * @param int_usb register contents
1047 * @param devctl
1048 */
1049
1050static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
1051 u8 devctl)
1052{
1053 irqreturn_t handled = IRQ_NONE;
1054
1055 musb_dbg(musb, "<== DevCtl=%02x, int_usb=0x%x", devctl, int_usb);
1056
1057 /* in host mode, the peripheral may issue remote wakeup.
1058 * in peripheral mode, the host may resume the link.
1059 * spurious RESUME irqs happen too, paired with SUSPEND.
1060 */
1061 if (int_usb & MUSB_INTR_RESUME) {
1062 musb_handle_intr_resume(musb, devctl);
1063 handled = IRQ_HANDLED;
1064 }
1065
1066 /* see manual for the order of the tests */
1067 if (int_usb & MUSB_INTR_SESSREQ) {
1068 if (musb_handle_intr_sessreq(musb, devctl))
1069 return IRQ_HANDLED;
1070 handled = IRQ_HANDLED;
1071 }
1072
1073 if (int_usb & MUSB_INTR_VBUSERROR) {
1074 musb_handle_intr_vbuserr(musb, devctl);
1075 handled = IRQ_HANDLED;
1076 }
1077
1078 if (int_usb & MUSB_INTR_SUSPEND) {
1079 musb_handle_intr_suspend(musb, devctl);
1080 handled = IRQ_HANDLED;
1081 }
1082
1083 if (int_usb & MUSB_INTR_CONNECT) {
1084 musb_handle_intr_connect(musb, devctl, int_usb);
1085 handled = IRQ_HANDLED;
1086 }
1087
1088 if (int_usb & MUSB_INTR_DISCONNECT) {
1089 musb_handle_intr_disconnect(musb, devctl);
1090 handled = IRQ_HANDLED;
1091 }
1092
1093 if (int_usb & MUSB_INTR_RESET) {
1094 musb_handle_intr_reset(musb);
1095 handled = IRQ_HANDLED;
1096 }
1097
1098#if 0
1099/* REVISIT ... this would be for multiplexing periodic endpoints, or
1100 * supporting transfer phasing to prevent exceeding ISO bandwidth
1101 * limits of a given frame or microframe.
1102 *
1103 * It's not needed for peripheral side, which dedicates endpoints;
1104 * though it _might_ use SOF irqs for other purposes.
1105 *
1106 * And it's not currently needed for host side, which also dedicates
1107 * endpoints, relies on TX/RX interval registers, and isn't claimed
1108 * to support ISO transfers yet.
1109 */
1110 if (int_usb & MUSB_INTR_SOF) {
1111 void __iomem *mbase = musb->mregs;
1112 struct musb_hw_ep *ep;
1113 u8 epnum;
1114 u16 frame;
1115
1116 dev_dbg(musb->controller, "START_OF_FRAME\n");
1117 handled = IRQ_HANDLED;
1118
1119 /* start any periodic Tx transfers waiting for current frame */
1120 frame = musb_readw(mbase, MUSB_FRAME);
1121 ep = musb->endpoints;
1122 for (epnum = 1; (epnum < musb->nr_endpoints)
1123 && (musb->epmask >= (1 << epnum));
1124 epnum++, ep++) {
1125 /*
1126 * FIXME handle framecounter wraps (12 bits)
1127 * eliminate duplicated StartUrb logic
1128 */
1129 if (ep->dwWaitFrame >= frame) {
1130 ep->dwWaitFrame = 0;
1131 pr_debug("SOF --> periodic TX%s on %d\n",
1132 ep->tx_channel ? " DMA" : "",
1133 epnum);
1134 if (!ep->tx_channel)
1135 musb_h_tx_start(musb, epnum);
1136 else
1137 cppi_hostdma_start(musb, epnum);
1138 }
1139 } /* end of for loop */
1140 }
1141#endif
1142
1143 schedule_delayed_work(&musb->irq_work, 0);
1144
1145 return handled;
1146}
1147
1148/*-------------------------------------------------------------------------*/
1149
1150static void musb_disable_interrupts(struct musb *musb)
1151{
1152 void __iomem *mbase = musb->mregs;
1153
1154 /* disable interrupts */
1155 musb_writeb(mbase, MUSB_INTRUSBE, 0);
1156 musb->intrtxe = 0;
1157 musb_writew(mbase, MUSB_INTRTXE, 0);
1158 musb->intrrxe = 0;
1159 musb_writew(mbase, MUSB_INTRRXE, 0);
1160
1161 /* flush pending interrupts */
1162 musb_clearb(mbase, MUSB_INTRUSB);
1163 musb_clearw(mbase, MUSB_INTRTX);
1164 musb_clearw(mbase, MUSB_INTRRX);
1165}
1166
1167static void musb_enable_interrupts(struct musb *musb)
1168{
1169 void __iomem *regs = musb->mregs;
1170
1171 /* Set INT enable registers, enable interrupts */
1172 musb->intrtxe = musb->epmask;
1173 musb_writew(regs, MUSB_INTRTXE, musb->intrtxe);
1174 musb->intrrxe = musb->epmask & 0xfffe;
1175 musb_writew(regs, MUSB_INTRRXE, musb->intrrxe);
1176 musb_writeb(regs, MUSB_INTRUSBE, 0xf7);
1177
1178}
1179
1180/*
1181 * Program the HDRC to start (enable interrupts, dma, etc.).
1182 */
1183void musb_start(struct musb *musb)
1184{
1185 void __iomem *regs = musb->mregs;
1186 u8 devctl = musb_readb(regs, MUSB_DEVCTL);
1187 u8 power;
1188
1189 musb_dbg(musb, "<== devctl %02x", devctl);
1190
1191 musb_enable_interrupts(musb);
1192 musb_writeb(regs, MUSB_TESTMODE, 0);
1193
1194 power = MUSB_POWER_ISOUPDATE;
1195 /*
1196 * treating UNKNOWN as unspecified maximum speed, in which case
1197 * we will default to high-speed.
1198 */
1199 if (musb->config->maximum_speed == USB_SPEED_HIGH ||
1200 musb->config->maximum_speed == USB_SPEED_UNKNOWN)
1201 power |= MUSB_POWER_HSENAB;
1202 musb_writeb(regs, MUSB_POWER, power);
1203
1204 musb->is_active = 0;
1205 devctl = musb_readb(regs, MUSB_DEVCTL);
1206 devctl &= ~MUSB_DEVCTL_SESSION;
1207
1208 /* session started after:
1209 * (a) ID-grounded irq, host mode;
1210 * (b) vbus present/connect IRQ, peripheral mode;
1211 * (c) peripheral initiates, using SRP
1212 */
1213 if (musb->port_mode != MUSB_HOST &&
1214 musb_get_state(musb) != OTG_STATE_A_WAIT_BCON &&
1215 (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) {
1216 musb->is_active = 1;
1217 } else {
1218 devctl |= MUSB_DEVCTL_SESSION;
1219 }
1220
1221 musb_platform_enable(musb);
1222 musb_writeb(regs, MUSB_DEVCTL, devctl);
1223}
1224
1225/*
1226 * Make the HDRC stop (disable interrupts, etc.);
1227 * reversible by musb_start
1228 * called on gadget driver unregister
1229 * with controller locked, irqs blocked
1230 * acts as a NOP unless some role activated the hardware
1231 */
1232void musb_stop(struct musb *musb)
1233{
1234 /* stop IRQs, timers, ... */
1235 musb_platform_disable(musb);
1236 musb_disable_interrupts(musb);
1237 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
1238
1239 /* FIXME
1240 * - mark host and/or peripheral drivers unusable/inactive
1241 * - disable DMA (and enable it in HdrcStart)
1242 * - make sure we can musb_start() after musb_stop(); with
1243 * OTG mode, gadget driver module rmmod/modprobe cycles that
1244 * - ...
1245 */
1246 musb_platform_try_idle(musb, 0);
1247}
1248
1249/*-------------------------------------------------------------------------*/
1250
1251/*
1252 * The silicon either has hard-wired endpoint configurations, or else
1253 * "dynamic fifo" sizing. The driver has support for both, though at this
1254 * writing only the dynamic sizing is very well tested. Since we switched
1255 * away from compile-time hardware parameters, we can no longer rely on
1256 * dead code elimination to leave only the relevant one in the object file.
1257 *
1258 * We don't currently use dynamic fifo setup capability to do anything
1259 * more than selecting one of a bunch of predefined configurations.
1260 */
1261static ushort fifo_mode;
1262
1263/* "modprobe ... fifo_mode=1" etc */
1264module_param(fifo_mode, ushort, 0);
1265MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration");
1266
1267/*
1268 * tables defining fifo_mode values. define more if you like.
1269 * for host side, make sure both halves of ep1 are set up.
1270 */
1271
1272/* mode 0 - fits in 2KB */
1273static struct musb_fifo_cfg mode_0_cfg[] = {
1274{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1275{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1276{ .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, },
1277{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1278{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1279};
1280
1281/* mode 1 - fits in 4KB */
1282static struct musb_fifo_cfg mode_1_cfg[] = {
1283{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1284{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1285{ .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1286{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1287{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1288};
1289
1290/* mode 2 - fits in 4KB */
1291static struct musb_fifo_cfg mode_2_cfg[] = {
1292{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1293{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1294{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1295{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1296{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 960, },
1297{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 1024, },
1298};
1299
1300/* mode 3 - fits in 4KB */
1301static struct musb_fifo_cfg mode_3_cfg[] = {
1302{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1303{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1304{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1305{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1306{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1307{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1308};
1309
1310/* mode 4 - fits in 16KB */
1311static struct musb_fifo_cfg mode_4_cfg[] = {
1312{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1313{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1314{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1315{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1316{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
1317{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
1318{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
1319{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
1320{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
1321{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
1322{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 512, },
1323{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 512, },
1324{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, },
1325{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 512, },
1326{ .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 512, },
1327{ .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 512, },
1328{ .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 512, },
1329{ .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 512, },
1330{ .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 256, },
1331{ .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 64, },
1332{ .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 256, },
1333{ .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 64, },
1334{ .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 256, },
1335{ .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 64, },
1336{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, },
1337{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1338{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1339};
1340
1341/* mode 5 - fits in 8KB */
1342static struct musb_fifo_cfg mode_5_cfg[] = {
1343{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1344{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1345{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1346{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1347{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
1348{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
1349{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
1350{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
1351{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
1352{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
1353{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 32, },
1354{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 32, },
1355{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 32, },
1356{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 32, },
1357{ .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 32, },
1358{ .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 32, },
1359{ .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 32, },
1360{ .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 32, },
1361{ .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 32, },
1362{ .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 32, },
1363{ .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 32, },
1364{ .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 32, },
1365{ .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 32, },
1366{ .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 32, },
1367{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, },
1368{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1369{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1370};
1371
1372/*
1373 * configure a fifo; for non-shared endpoints, this may be called
1374 * once for a tx fifo and once for an rx fifo.
1375 *
1376 * returns negative errno or offset for next fifo.
1377 */
1378static int
1379fifo_setup(struct musb *musb, struct musb_hw_ep *hw_ep,
1380 const struct musb_fifo_cfg *cfg, u16 offset)
1381{
1382 void __iomem *mbase = musb->mregs;
1383 int size = 0;
1384 u16 maxpacket = cfg->maxpacket;
1385 u16 c_off = offset >> 3;
1386 u8 c_size;
1387
1388 /* expect hw_ep has already been zero-initialized */
1389
1390 size = ffs(max(maxpacket, (u16) 8)) - 1;
1391 maxpacket = 1 << size;
1392
1393 c_size = size - 3;
1394 if (cfg->mode == BUF_DOUBLE) {
1395 if ((offset + (maxpacket << 1)) >
1396 (1 << (musb->config->ram_bits + 2)))
1397 return -EMSGSIZE;
1398 c_size |= MUSB_FIFOSZ_DPB;
1399 } else {
1400 if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2)))
1401 return -EMSGSIZE;
1402 }
1403
1404 /* configure the FIFO */
1405 musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum);
1406
1407 /* EP0 reserved endpoint for control, bidirectional;
1408 * EP1 reserved for bulk, two unidirectional halves.
1409 */
1410 if (hw_ep->epnum == 1)
1411 musb->bulk_ep = hw_ep;
1412 /* REVISIT error check: be sure ep0 can both rx and tx ... */
1413 switch (cfg->style) {
1414 case FIFO_TX:
1415 musb_writeb(mbase, MUSB_TXFIFOSZ, c_size);
1416 musb_writew(mbase, MUSB_TXFIFOADD, c_off);
1417 hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1418 hw_ep->max_packet_sz_tx = maxpacket;
1419 break;
1420 case FIFO_RX:
1421 musb_writeb(mbase, MUSB_RXFIFOSZ, c_size);
1422 musb_writew(mbase, MUSB_RXFIFOADD, c_off);
1423 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1424 hw_ep->max_packet_sz_rx = maxpacket;
1425 break;
1426 case FIFO_RXTX:
1427 musb_writeb(mbase, MUSB_TXFIFOSZ, c_size);
1428 musb_writew(mbase, MUSB_TXFIFOADD, c_off);
1429 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1430 hw_ep->max_packet_sz_rx = maxpacket;
1431
1432 musb_writeb(mbase, MUSB_RXFIFOSZ, c_size);
1433 musb_writew(mbase, MUSB_RXFIFOADD, c_off);
1434 hw_ep->tx_double_buffered = hw_ep->rx_double_buffered;
1435 hw_ep->max_packet_sz_tx = maxpacket;
1436
1437 hw_ep->is_shared_fifo = true;
1438 break;
1439 }
1440
1441 /* NOTE rx and tx endpoint irqs aren't managed separately,
1442 * which happens to be ok
1443 */
1444 musb->epmask |= (1 << hw_ep->epnum);
1445
1446 return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0));
1447}
1448
1449static struct musb_fifo_cfg ep0_cfg = {
1450 .style = FIFO_RXTX, .maxpacket = 64,
1451};
1452
1453static int ep_config_from_table(struct musb *musb)
1454{
1455 const struct musb_fifo_cfg *cfg;
1456 unsigned i, n;
1457 int offset;
1458 struct musb_hw_ep *hw_ep = musb->endpoints;
1459
1460 if (musb->config->fifo_cfg) {
1461 cfg = musb->config->fifo_cfg;
1462 n = musb->config->fifo_cfg_size;
1463 goto done;
1464 }
1465
1466 switch (fifo_mode) {
1467 default:
1468 fifo_mode = 0;
1469 fallthrough;
1470 case 0:
1471 cfg = mode_0_cfg;
1472 n = ARRAY_SIZE(mode_0_cfg);
1473 break;
1474 case 1:
1475 cfg = mode_1_cfg;
1476 n = ARRAY_SIZE(mode_1_cfg);
1477 break;
1478 case 2:
1479 cfg = mode_2_cfg;
1480 n = ARRAY_SIZE(mode_2_cfg);
1481 break;
1482 case 3:
1483 cfg = mode_3_cfg;
1484 n = ARRAY_SIZE(mode_3_cfg);
1485 break;
1486 case 4:
1487 cfg = mode_4_cfg;
1488 n = ARRAY_SIZE(mode_4_cfg);
1489 break;
1490 case 5:
1491 cfg = mode_5_cfg;
1492 n = ARRAY_SIZE(mode_5_cfg);
1493 break;
1494 }
1495
1496 pr_debug("%s: setup fifo_mode %d\n", musb_driver_name, fifo_mode);
1497
1498
1499done:
1500 offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0);
1501 /* assert(offset > 0) */
1502
1503 /* NOTE: for RTL versions >= 1.400 EPINFO and RAMINFO would
1504 * be better than static musb->config->num_eps and DYN_FIFO_SIZE...
1505 */
1506
1507 for (i = 0; i < n; i++) {
1508 u8 epn = cfg->hw_ep_num;
1509
1510 if (epn >= musb->config->num_eps) {
1511 pr_debug("%s: invalid ep %d\n",
1512 musb_driver_name, epn);
1513 return -EINVAL;
1514 }
1515 offset = fifo_setup(musb, hw_ep + epn, cfg++, offset);
1516 if (offset < 0) {
1517 pr_debug("%s: mem overrun, ep %d\n",
1518 musb_driver_name, epn);
1519 return offset;
1520 }
1521 epn++;
1522 musb->nr_endpoints = max(epn, musb->nr_endpoints);
1523 }
1524
1525 pr_debug("%s: %d/%d max ep, %d/%d memory\n",
1526 musb_driver_name,
1527 n + 1, musb->config->num_eps * 2 - 1,
1528 offset, (1 << (musb->config->ram_bits + 2)));
1529
1530 if (!musb->bulk_ep) {
1531 pr_debug("%s: missing bulk\n", musb_driver_name);
1532 return -EINVAL;
1533 }
1534
1535 return 0;
1536}
1537
1538
1539/*
1540 * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false
1541 * @param musb the controller
1542 */
1543static int ep_config_from_hw(struct musb *musb)
1544{
1545 u8 epnum = 0;
1546 struct musb_hw_ep *hw_ep;
1547 void __iomem *mbase = musb->mregs;
1548 int ret = 0;
1549
1550 musb_dbg(musb, "<== static silicon ep config");
1551
1552 /* FIXME pick up ep0 maxpacket size */
1553
1554 for (epnum = 1; epnum < musb->config->num_eps; epnum++) {
1555 musb_ep_select(mbase, epnum);
1556 hw_ep = musb->endpoints + epnum;
1557
1558 ret = musb_read_fifosize(musb, hw_ep, epnum);
1559 if (ret < 0)
1560 break;
1561
1562 /* FIXME set up hw_ep->{rx,tx}_double_buffered */
1563
1564 /* pick an RX/TX endpoint for bulk */
1565 if (hw_ep->max_packet_sz_tx < 512
1566 || hw_ep->max_packet_sz_rx < 512)
1567 continue;
1568
1569 /* REVISIT: this algorithm is lazy, we should at least
1570 * try to pick a double buffered endpoint.
1571 */
1572 if (musb->bulk_ep)
1573 continue;
1574 musb->bulk_ep = hw_ep;
1575 }
1576
1577 if (!musb->bulk_ep) {
1578 pr_debug("%s: missing bulk\n", musb_driver_name);
1579 return -EINVAL;
1580 }
1581
1582 return 0;
1583}
1584
1585enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, };
1586
1587/* Initialize MUSB (M)HDRC part of the USB hardware subsystem;
1588 * configure endpoints, or take their config from silicon
1589 */
1590static int musb_core_init(u16 musb_type, struct musb *musb)
1591{
1592 u8 reg;
1593 char *type;
1594 char aInfo[90];
1595 void __iomem *mbase = musb->mregs;
1596 int status = 0;
1597 int i;
1598
1599 /* log core options (read using indexed model) */
1600 reg = musb_read_configdata(mbase);
1601
1602 strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8");
1603 if (reg & MUSB_CONFIGDATA_DYNFIFO) {
1604 strcat(aInfo, ", dyn FIFOs");
1605 musb->dyn_fifo = true;
1606 }
1607 if (reg & MUSB_CONFIGDATA_MPRXE) {
1608 strcat(aInfo, ", bulk combine");
1609 musb->bulk_combine = true;
1610 }
1611 if (reg & MUSB_CONFIGDATA_MPTXE) {
1612 strcat(aInfo, ", bulk split");
1613 musb->bulk_split = true;
1614 }
1615 if (reg & MUSB_CONFIGDATA_HBRXE) {
1616 strcat(aInfo, ", HB-ISO Rx");
1617 musb->hb_iso_rx = true;
1618 }
1619 if (reg & MUSB_CONFIGDATA_HBTXE) {
1620 strcat(aInfo, ", HB-ISO Tx");
1621 musb->hb_iso_tx = true;
1622 }
1623 if (reg & MUSB_CONFIGDATA_SOFTCONE)
1624 strcat(aInfo, ", SoftConn");
1625
1626 pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo);
1627
1628 if (MUSB_CONTROLLER_MHDRC == musb_type) {
1629 musb->is_multipoint = 1;
1630 type = "M";
1631 } else {
1632 musb->is_multipoint = 0;
1633 type = "";
1634 if (IS_ENABLED(CONFIG_USB) &&
1635 !IS_ENABLED(CONFIG_USB_OTG_DISABLE_EXTERNAL_HUB)) {
1636 pr_err("%s: kernel must disable external hubs, please fix the configuration\n",
1637 musb_driver_name);
1638 }
1639 }
1640
1641 /* log release info */
1642 musb->hwvers = musb_readw(mbase, MUSB_HWVERS);
1643 pr_debug("%s: %sHDRC RTL version %d.%d%s\n",
1644 musb_driver_name, type, MUSB_HWVERS_MAJOR(musb->hwvers),
1645 MUSB_HWVERS_MINOR(musb->hwvers),
1646 (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
1647
1648 /* configure ep0 */
1649 musb_configure_ep0(musb);
1650
1651 /* discover endpoint configuration */
1652 musb->nr_endpoints = 1;
1653 musb->epmask = 1;
1654
1655 if (musb->dyn_fifo)
1656 status = ep_config_from_table(musb);
1657 else
1658 status = ep_config_from_hw(musb);
1659
1660 if (status < 0)
1661 return status;
1662
1663 /* finish init, and print endpoint config */
1664 for (i = 0; i < musb->nr_endpoints; i++) {
1665 struct musb_hw_ep *hw_ep = musb->endpoints + i;
1666
1667 hw_ep->fifo = musb->io.fifo_offset(i) + mbase;
1668#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
1669 if (musb->ops->quirks & MUSB_IN_TUSB) {
1670 hw_ep->fifo_async = musb->async + 0x400 +
1671 musb->io.fifo_offset(i);
1672 hw_ep->fifo_sync = musb->sync + 0x400 +
1673 musb->io.fifo_offset(i);
1674 hw_ep->fifo_sync_va =
1675 musb->sync_va + 0x400 + musb->io.fifo_offset(i);
1676
1677 if (i == 0)
1678 hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF;
1679 else
1680 hw_ep->conf = mbase + 0x400 +
1681 (((i - 1) & 0xf) << 2);
1682 }
1683#endif
1684
1685 hw_ep->regs = musb->io.ep_offset(i, 0) + mbase;
1686 hw_ep->rx_reinit = 1;
1687 hw_ep->tx_reinit = 1;
1688
1689 if (hw_ep->max_packet_sz_tx) {
1690 musb_dbg(musb, "%s: hw_ep %d%s, %smax %d",
1691 musb_driver_name, i,
1692 hw_ep->is_shared_fifo ? "shared" : "tx",
1693 hw_ep->tx_double_buffered
1694 ? "doublebuffer, " : "",
1695 hw_ep->max_packet_sz_tx);
1696 }
1697 if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) {
1698 musb_dbg(musb, "%s: hw_ep %d%s, %smax %d",
1699 musb_driver_name, i,
1700 "rx",
1701 hw_ep->rx_double_buffered
1702 ? "doublebuffer, " : "",
1703 hw_ep->max_packet_sz_rx);
1704 }
1705 if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx))
1706 musb_dbg(musb, "hw_ep %d not configured", i);
1707 }
1708
1709 return 0;
1710}
1711
1712/*-------------------------------------------------------------------------*/
1713
1714/*
1715 * handle all the irqs defined by the HDRC core. for now we expect: other
1716 * irq sources (phy, dma, etc) will be handled first, musb->int_* values
1717 * will be assigned, and the irq will already have been acked.
1718 *
1719 * called in irq context with spinlock held, irqs blocked
1720 */
1721irqreturn_t musb_interrupt(struct musb *musb)
1722{
1723 irqreturn_t retval = IRQ_NONE;
1724 unsigned long status;
1725 unsigned long epnum;
1726 u8 devctl;
1727
1728 if (!musb->int_usb && !musb->int_tx && !musb->int_rx)
1729 return IRQ_NONE;
1730
1731 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1732
1733 trace_musb_isr(musb);
1734
1735 /**
1736 * According to Mentor Graphics' documentation, flowchart on page 98,
1737 * IRQ should be handled as follows:
1738 *
1739 * . Resume IRQ
1740 * . Session Request IRQ
1741 * . VBUS Error IRQ
1742 * . Suspend IRQ
1743 * . Connect IRQ
1744 * . Disconnect IRQ
1745 * . Reset/Babble IRQ
1746 * . SOF IRQ (we're not using this one)
1747 * . Endpoint 0 IRQ
1748 * . TX Endpoints
1749 * . RX Endpoints
1750 *
1751 * We will be following that flowchart in order to avoid any problems
1752 * that might arise with internal Finite State Machine.
1753 */
1754
1755 if (musb->int_usb)
1756 retval |= musb_stage0_irq(musb, musb->int_usb, devctl);
1757
1758 if (musb->int_tx & 1) {
1759 if (is_host_active(musb))
1760 retval |= musb_h_ep0_irq(musb);
1761 else
1762 retval |= musb_g_ep0_irq(musb);
1763
1764 /* we have just handled endpoint 0 IRQ, clear it */
1765 musb->int_tx &= ~BIT(0);
1766 }
1767
1768 status = musb->int_tx;
1769
1770 for_each_set_bit(epnum, &status, 16) {
1771 retval = IRQ_HANDLED;
1772 if (is_host_active(musb))
1773 musb_host_tx(musb, epnum);
1774 else
1775 musb_g_tx(musb, epnum);
1776 }
1777
1778 status = musb->int_rx;
1779
1780 for_each_set_bit(epnum, &status, 16) {
1781 retval = IRQ_HANDLED;
1782 if (is_host_active(musb))
1783 musb_host_rx(musb, epnum);
1784 else
1785 musb_g_rx(musb, epnum);
1786 }
1787
1788 return retval;
1789}
1790EXPORT_SYMBOL_GPL(musb_interrupt);
1791
1792#ifndef CONFIG_MUSB_PIO_ONLY
1793static bool use_dma = true;
1794
1795/* "modprobe ... use_dma=0" etc */
1796module_param(use_dma, bool, 0644);
1797MODULE_PARM_DESC(use_dma, "enable/disable use of DMA");
1798
1799void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit)
1800{
1801 /* called with controller lock already held */
1802
1803 if (!epnum) {
1804 if (!is_cppi_enabled(musb)) {
1805 /* endpoint 0 */
1806 if (is_host_active(musb))
1807 musb_h_ep0_irq(musb);
1808 else
1809 musb_g_ep0_irq(musb);
1810 }
1811 } else {
1812 /* endpoints 1..15 */
1813 if (transmit) {
1814 if (is_host_active(musb))
1815 musb_host_tx(musb, epnum);
1816 else
1817 musb_g_tx(musb, epnum);
1818 } else {
1819 /* receive */
1820 if (is_host_active(musb))
1821 musb_host_rx(musb, epnum);
1822 else
1823 musb_g_rx(musb, epnum);
1824 }
1825 }
1826}
1827EXPORT_SYMBOL_GPL(musb_dma_completion);
1828
1829#else
1830#define use_dma 0
1831#endif
1832
1833static int (*musb_phy_callback)(enum musb_vbus_id_status status);
1834
1835/*
1836 * musb_mailbox - optional phy notifier function
1837 * @status phy state change
1838 *
1839 * Optionally gets called from the USB PHY. Note that the USB PHY must be
1840 * disabled at the point the phy_callback is registered or unregistered.
1841 */
1842int musb_mailbox(enum musb_vbus_id_status status)
1843{
1844 if (musb_phy_callback)
1845 return musb_phy_callback(status);
1846
1847 return -ENODEV;
1848};
1849EXPORT_SYMBOL_GPL(musb_mailbox);
1850
1851/*-------------------------------------------------------------------------*/
1852
1853static ssize_t
1854mode_show(struct device *dev, struct device_attribute *attr, char *buf)
1855{
1856 struct musb *musb = dev_to_musb(dev);
1857 unsigned long flags;
1858 int ret;
1859
1860 spin_lock_irqsave(&musb->lock, flags);
1861 ret = sprintf(buf, "%s\n", musb_otg_state_string(musb));
1862 spin_unlock_irqrestore(&musb->lock, flags);
1863
1864 return ret;
1865}
1866
1867static ssize_t
1868mode_store(struct device *dev, struct device_attribute *attr,
1869 const char *buf, size_t n)
1870{
1871 struct musb *musb = dev_to_musb(dev);
1872 unsigned long flags;
1873 int status;
1874
1875 spin_lock_irqsave(&musb->lock, flags);
1876 if (sysfs_streq(buf, "host"))
1877 status = musb_platform_set_mode(musb, MUSB_HOST);
1878 else if (sysfs_streq(buf, "peripheral"))
1879 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
1880 else if (sysfs_streq(buf, "otg"))
1881 status = musb_platform_set_mode(musb, MUSB_OTG);
1882 else
1883 status = -EINVAL;
1884 spin_unlock_irqrestore(&musb->lock, flags);
1885
1886 return (status == 0) ? n : status;
1887}
1888static DEVICE_ATTR_RW(mode);
1889
1890static ssize_t
1891vbus_store(struct device *dev, struct device_attribute *attr,
1892 const char *buf, size_t n)
1893{
1894 struct musb *musb = dev_to_musb(dev);
1895 unsigned long flags;
1896 unsigned long val;
1897
1898 if (sscanf(buf, "%lu", &val) < 1) {
1899 dev_err(dev, "Invalid VBUS timeout ms value\n");
1900 return -EINVAL;
1901 }
1902
1903 spin_lock_irqsave(&musb->lock, flags);
1904 /* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
1905 musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
1906 if (musb_get_state(musb) == OTG_STATE_A_WAIT_BCON)
1907 musb->is_active = 0;
1908 musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
1909 spin_unlock_irqrestore(&musb->lock, flags);
1910
1911 return n;
1912}
1913
1914static ssize_t
1915vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
1916{
1917 struct musb *musb = dev_to_musb(dev);
1918 unsigned long flags;
1919 unsigned long val;
1920 int vbus;
1921 u8 devctl;
1922
1923 pm_runtime_get_sync(dev);
1924 spin_lock_irqsave(&musb->lock, flags);
1925 val = musb->a_wait_bcon;
1926 vbus = musb_platform_get_vbus_status(musb);
1927 if (vbus < 0) {
1928 /* Use default MUSB method by means of DEVCTL register */
1929 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1930 if ((devctl & MUSB_DEVCTL_VBUS)
1931 == (3 << MUSB_DEVCTL_VBUS_SHIFT))
1932 vbus = 1;
1933 else
1934 vbus = 0;
1935 }
1936 spin_unlock_irqrestore(&musb->lock, flags);
1937 pm_runtime_put_sync(dev);
1938
1939 return sprintf(buf, "Vbus %s, timeout %lu msec\n",
1940 vbus ? "on" : "off", val);
1941}
1942static DEVICE_ATTR_RW(vbus);
1943
1944/* Gadget drivers can't know that a host is connected so they might want
1945 * to start SRP, but users can. This allows userspace to trigger SRP.
1946 */
1947static ssize_t srp_store(struct device *dev, struct device_attribute *attr,
1948 const char *buf, size_t n)
1949{
1950 struct musb *musb = dev_to_musb(dev);
1951 unsigned short srp;
1952
1953 if (sscanf(buf, "%hu", &srp) != 1
1954 || (srp != 1)) {
1955 dev_err(dev, "SRP: Value must be 1\n");
1956 return -EINVAL;
1957 }
1958
1959 if (srp == 1)
1960 musb_g_wakeup(musb);
1961
1962 return n;
1963}
1964static DEVICE_ATTR_WO(srp);
1965
1966static struct attribute *musb_attrs[] = {
1967 &dev_attr_mode.attr,
1968 &dev_attr_vbus.attr,
1969 &dev_attr_srp.attr,
1970 NULL
1971};
1972ATTRIBUTE_GROUPS(musb);
1973
1974#define MUSB_QUIRK_B_INVALID_VBUS_91 (MUSB_DEVCTL_BDEVICE | \
1975 (2 << MUSB_DEVCTL_VBUS_SHIFT) | \
1976 MUSB_DEVCTL_SESSION)
1977#define MUSB_QUIRK_B_DISCONNECT_99 (MUSB_DEVCTL_BDEVICE | \
1978 (3 << MUSB_DEVCTL_VBUS_SHIFT) | \
1979 MUSB_DEVCTL_SESSION)
1980#define MUSB_QUIRK_A_DISCONNECT_19 ((3 << MUSB_DEVCTL_VBUS_SHIFT) | \
1981 MUSB_DEVCTL_SESSION)
1982
1983static bool musb_state_needs_recheck(struct musb *musb, u8 devctl,
1984 const char *desc)
1985{
1986 if (musb->quirk_retries && !musb->flush_irq_work) {
1987 trace_musb_state(musb, devctl, desc);
1988 schedule_delayed_work(&musb->irq_work,
1989 msecs_to_jiffies(1000));
1990 musb->quirk_retries--;
1991
1992 return true;
1993 }
1994
1995 return false;
1996}
1997
1998/*
1999 * Check the musb devctl session bit to determine if we want to
2000 * allow PM runtime for the device. In general, we want to keep things
2001 * active when the session bit is set except after host disconnect.
2002 *
2003 * Only called from musb_irq_work. If this ever needs to get called
2004 * elsewhere, proper locking must be implemented for musb->session.
2005 */
2006static void musb_pm_runtime_check_session(struct musb *musb)
2007{
2008 u8 devctl, s;
2009 int error;
2010
2011 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2012
2013 /* Handle session status quirks first */
2014 s = MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV |
2015 MUSB_DEVCTL_HR;
2016 switch (devctl & ~s) {
2017 case MUSB_QUIRK_B_DISCONNECT_99:
2018 musb_state_needs_recheck(musb, devctl,
2019 "Poll devctl in case of suspend after disconnect");
2020 break;
2021 case MUSB_QUIRK_B_INVALID_VBUS_91:
2022 if (musb_state_needs_recheck(musb, devctl,
2023 "Poll devctl on invalid vbus, assume no session"))
2024 return;
2025 fallthrough;
2026 case MUSB_QUIRK_A_DISCONNECT_19:
2027 if (musb_state_needs_recheck(musb, devctl,
2028 "Poll devctl on possible host mode disconnect"))
2029 return;
2030 if (!musb->session)
2031 break;
2032 trace_musb_state(musb, devctl, "Allow PM on possible host mode disconnect");
2033 pm_runtime_mark_last_busy(musb->controller);
2034 pm_runtime_put_autosuspend(musb->controller);
2035 musb->session = false;
2036 return;
2037 default:
2038 break;
2039 }
2040
2041 /* No need to do anything if session has not changed */
2042 s = devctl & MUSB_DEVCTL_SESSION;
2043 if (s == musb->session)
2044 return;
2045
2046 /* Block PM or allow PM? */
2047 if (s) {
2048 trace_musb_state(musb, devctl, "Block PM on active session");
2049 error = pm_runtime_get_sync(musb->controller);
2050 if (error < 0)
2051 dev_err(musb->controller, "Could not enable: %i\n",
2052 error);
2053 musb->quirk_retries = 3;
2054
2055 /*
2056 * We can get a spurious MUSB_INTR_SESSREQ interrupt on start-up
2057 * in B-peripheral mode with nothing connected and the session
2058 * bit clears silently. Check status again in 3 seconds.
2059 */
2060 if (devctl & MUSB_DEVCTL_BDEVICE)
2061 schedule_delayed_work(&musb->irq_work,
2062 msecs_to_jiffies(3000));
2063 } else {
2064 trace_musb_state(musb, devctl, "Allow PM with no session");
2065 pm_runtime_mark_last_busy(musb->controller);
2066 pm_runtime_put_autosuspend(musb->controller);
2067 }
2068
2069 musb->session = s;
2070}
2071
2072/* Only used to provide driver mode change events */
2073static void musb_irq_work(struct work_struct *data)
2074{
2075 struct musb *musb = container_of(data, struct musb, irq_work.work);
2076 int error;
2077
2078 error = pm_runtime_resume_and_get(musb->controller);
2079 if (error < 0) {
2080 dev_err(musb->controller, "Could not enable: %i\n", error);
2081
2082 return;
2083 }
2084
2085 musb_pm_runtime_check_session(musb);
2086
2087 if (musb_get_state(musb) != musb->xceiv_old_state) {
2088 musb->xceiv_old_state = musb_get_state(musb);
2089 sysfs_notify(&musb->controller->kobj, NULL, "mode");
2090 }
2091
2092 pm_runtime_mark_last_busy(musb->controller);
2093 pm_runtime_put_autosuspend(musb->controller);
2094}
2095
2096static void musb_recover_from_babble(struct musb *musb)
2097{
2098 int ret;
2099 u8 devctl;
2100
2101 musb_disable_interrupts(musb);
2102
2103 /*
2104 * wait at least 320 cycles of 60MHz clock. That's 5.3us, we will give
2105 * it some slack and wait for 10us.
2106 */
2107 udelay(10);
2108
2109 ret = musb_platform_recover(musb);
2110 if (ret) {
2111 musb_enable_interrupts(musb);
2112 return;
2113 }
2114
2115 /* drop session bit */
2116 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2117 devctl &= ~MUSB_DEVCTL_SESSION;
2118 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
2119
2120 /* tell usbcore about it */
2121 musb_root_disconnect(musb);
2122
2123 /*
2124 * When a babble condition occurs, the musb controller
2125 * removes the session bit and the endpoint config is lost.
2126 */
2127 if (musb->dyn_fifo)
2128 ret = ep_config_from_table(musb);
2129 else
2130 ret = ep_config_from_hw(musb);
2131
2132 /* restart session */
2133 if (ret == 0)
2134 musb_start(musb);
2135}
2136
2137/* --------------------------------------------------------------------------
2138 * Init support
2139 */
2140
2141static struct musb *allocate_instance(struct device *dev,
2142 const struct musb_hdrc_config *config, void __iomem *mbase)
2143{
2144 struct musb *musb;
2145 struct musb_hw_ep *ep;
2146 int epnum;
2147 int ret;
2148
2149 musb = devm_kzalloc(dev, sizeof(*musb), GFP_KERNEL);
2150 if (!musb)
2151 return NULL;
2152
2153 INIT_LIST_HEAD(&musb->control);
2154 INIT_LIST_HEAD(&musb->in_bulk);
2155 INIT_LIST_HEAD(&musb->out_bulk);
2156 INIT_LIST_HEAD(&musb->pending_list);
2157
2158 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
2159 musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON;
2160 musb->mregs = mbase;
2161 musb->ctrl_base = mbase;
2162 musb->nIrq = -ENODEV;
2163 musb->config = config;
2164 BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS);
2165 for (epnum = 0, ep = musb->endpoints;
2166 epnum < musb->config->num_eps;
2167 epnum++, ep++) {
2168 ep->musb = musb;
2169 ep->epnum = epnum;
2170 }
2171
2172 musb->controller = dev;
2173
2174 ret = musb_host_alloc(musb);
2175 if (ret < 0)
2176 goto err_free;
2177
2178 dev_set_drvdata(dev, musb);
2179
2180 return musb;
2181
2182err_free:
2183 return NULL;
2184}
2185
2186static void musb_free(struct musb *musb)
2187{
2188 /* this has multiple entry modes. it handles fault cleanup after
2189 * probe(), where things may be partially set up, as well as rmmod
2190 * cleanup after everything's been de-activated.
2191 */
2192
2193 if (musb->nIrq >= 0) {
2194 if (musb->irq_wake)
2195 disable_irq_wake(musb->nIrq);
2196 free_irq(musb->nIrq, musb);
2197 }
2198
2199 musb_host_free(musb);
2200}
2201
2202struct musb_pending_work {
2203 int (*callback)(struct musb *musb, void *data);
2204 void *data;
2205 struct list_head node;
2206};
2207
2208#ifdef CONFIG_PM
2209/*
2210 * Called from musb_runtime_resume(), musb_resume(), and
2211 * musb_queue_resume_work(). Callers must take musb->lock.
2212 */
2213static int musb_run_resume_work(struct musb *musb)
2214{
2215 struct musb_pending_work *w, *_w;
2216 unsigned long flags;
2217 int error = 0;
2218
2219 spin_lock_irqsave(&musb->list_lock, flags);
2220 list_for_each_entry_safe(w, _w, &musb->pending_list, node) {
2221 if (w->callback) {
2222 error = w->callback(musb, w->data);
2223 if (error < 0) {
2224 dev_err(musb->controller,
2225 "resume callback %p failed: %i\n",
2226 w->callback, error);
2227 }
2228 }
2229 list_del(&w->node);
2230 devm_kfree(musb->controller, w);
2231 }
2232 spin_unlock_irqrestore(&musb->list_lock, flags);
2233
2234 return error;
2235}
2236#endif
2237
2238/*
2239 * Called to run work if device is active or else queue the work to happen
2240 * on resume. Caller must take musb->lock and must hold an RPM reference.
2241 *
2242 * Note that we cowardly refuse queuing work after musb PM runtime
2243 * resume is done calling musb_run_resume_work() and return -EINPROGRESS
2244 * instead.
2245 */
2246int musb_queue_resume_work(struct musb *musb,
2247 int (*callback)(struct musb *musb, void *data),
2248 void *data)
2249{
2250 struct musb_pending_work *w;
2251 unsigned long flags;
2252 bool is_suspended;
2253 int error;
2254
2255 if (WARN_ON(!callback))
2256 return -EINVAL;
2257
2258 spin_lock_irqsave(&musb->list_lock, flags);
2259 is_suspended = musb->is_runtime_suspended;
2260
2261 if (is_suspended) {
2262 w = devm_kzalloc(musb->controller, sizeof(*w), GFP_ATOMIC);
2263 if (!w) {
2264 error = -ENOMEM;
2265 goto out_unlock;
2266 }
2267
2268 w->callback = callback;
2269 w->data = data;
2270
2271 list_add_tail(&w->node, &musb->pending_list);
2272 error = 0;
2273 }
2274
2275out_unlock:
2276 spin_unlock_irqrestore(&musb->list_lock, flags);
2277
2278 if (!is_suspended)
2279 error = callback(musb, data);
2280
2281 return error;
2282}
2283EXPORT_SYMBOL_GPL(musb_queue_resume_work);
2284
2285static void musb_deassert_reset(struct work_struct *work)
2286{
2287 struct musb *musb;
2288 unsigned long flags;
2289
2290 musb = container_of(work, struct musb, deassert_reset_work.work);
2291
2292 spin_lock_irqsave(&musb->lock, flags);
2293
2294 if (musb->port1_status & USB_PORT_STAT_RESET)
2295 musb_port_reset(musb, false);
2296
2297 spin_unlock_irqrestore(&musb->lock, flags);
2298}
2299
2300/*
2301 * Perform generic per-controller initialization.
2302 *
2303 * @dev: the controller (already clocked, etc)
2304 * @nIrq: IRQ number
2305 * @ctrl: virtual address of controller registers,
2306 * not yet corrected for platform-specific offsets
2307 */
2308static int
2309musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
2310{
2311 int status;
2312 struct musb *musb;
2313 struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
2314
2315 /* The driver might handle more features than the board; OK.
2316 * Fail when the board needs a feature that's not enabled.
2317 */
2318 if (!plat) {
2319 dev_err(dev, "no platform_data?\n");
2320 status = -ENODEV;
2321 goto fail0;
2322 }
2323
2324 /* allocate */
2325 musb = allocate_instance(dev, plat->config, ctrl);
2326 if (!musb) {
2327 status = -ENOMEM;
2328 goto fail0;
2329 }
2330
2331 spin_lock_init(&musb->lock);
2332 spin_lock_init(&musb->list_lock);
2333 musb->min_power = plat->min_power;
2334 musb->ops = plat->platform_ops;
2335 musb->port_mode = plat->mode;
2336
2337 /*
2338 * Initialize the default IO functions. At least omap2430 needs
2339 * these early. We initialize the platform specific IO functions
2340 * later on.
2341 */
2342 musb_readb = musb_default_readb;
2343 musb_writeb = musb_default_writeb;
2344 musb_readw = musb_default_readw;
2345 musb_writew = musb_default_writew;
2346
2347 /* The musb_platform_init() call:
2348 * - adjusts musb->mregs
2349 * - sets the musb->isr
2350 * - may initialize an integrated transceiver
2351 * - initializes musb->xceiv, usually by otg_get_phy()
2352 * - stops powering VBUS
2353 *
2354 * There are various transceiver configurations.
2355 * DaVinci, TUSB60x0, and others integrate them. OMAP3 uses
2356 * external/discrete ones in various flavors (twl4030 family,
2357 * isp1504, non-OTG, etc) mostly hooking up through ULPI.
2358 */
2359 status = musb_platform_init(musb);
2360 if (status < 0)
2361 goto fail1;
2362
2363 if (!musb->isr) {
2364 status = -ENODEV;
2365 goto fail2;
2366 }
2367
2368
2369 /* Most devices use indexed offset or flat offset */
2370 if (musb->ops->quirks & MUSB_INDEXED_EP) {
2371 musb->io.ep_offset = musb_indexed_ep_offset;
2372 musb->io.ep_select = musb_indexed_ep_select;
2373 } else {
2374 musb->io.ep_offset = musb_flat_ep_offset;
2375 musb->io.ep_select = musb_flat_ep_select;
2376 }
2377
2378 if (musb->ops->quirks & MUSB_G_NO_SKB_RESERVE)
2379 musb->g.quirk_avoids_skb_reserve = 1;
2380
2381 /* At least tusb6010 has its own offsets */
2382 if (musb->ops->ep_offset)
2383 musb->io.ep_offset = musb->ops->ep_offset;
2384 if (musb->ops->ep_select)
2385 musb->io.ep_select = musb->ops->ep_select;
2386
2387 if (musb->ops->fifo_mode)
2388 fifo_mode = musb->ops->fifo_mode;
2389 else
2390 fifo_mode = 4;
2391
2392 if (musb->ops->fifo_offset)
2393 musb->io.fifo_offset = musb->ops->fifo_offset;
2394 else
2395 musb->io.fifo_offset = musb_default_fifo_offset;
2396
2397 if (musb->ops->busctl_offset)
2398 musb->io.busctl_offset = musb->ops->busctl_offset;
2399 else
2400 musb->io.busctl_offset = musb_default_busctl_offset;
2401
2402 if (musb->ops->readb)
2403 musb_readb = musb->ops->readb;
2404 if (musb->ops->writeb)
2405 musb_writeb = musb->ops->writeb;
2406 if (musb->ops->clearb)
2407 musb_clearb = musb->ops->clearb;
2408 else
2409 musb_clearb = musb_readb;
2410
2411 if (musb->ops->readw)
2412 musb_readw = musb->ops->readw;
2413 if (musb->ops->writew)
2414 musb_writew = musb->ops->writew;
2415 if (musb->ops->clearw)
2416 musb_clearw = musb->ops->clearw;
2417 else
2418 musb_clearw = musb_readw;
2419
2420#ifndef CONFIG_MUSB_PIO_ONLY
2421 if (!musb->ops->dma_init || !musb->ops->dma_exit) {
2422 dev_err(dev, "DMA controller not set\n");
2423 status = -ENODEV;
2424 goto fail2;
2425 }
2426 musb_dma_controller_create = musb->ops->dma_init;
2427 musb_dma_controller_destroy = musb->ops->dma_exit;
2428#endif
2429
2430 if (musb->ops->read_fifo)
2431 musb->io.read_fifo = musb->ops->read_fifo;
2432 else
2433 musb->io.read_fifo = musb_default_read_fifo;
2434
2435 if (musb->ops->write_fifo)
2436 musb->io.write_fifo = musb->ops->write_fifo;
2437 else
2438 musb->io.write_fifo = musb_default_write_fifo;
2439
2440 if (musb->ops->get_toggle)
2441 musb->io.get_toggle = musb->ops->get_toggle;
2442 else
2443 musb->io.get_toggle = musb_default_get_toggle;
2444
2445 if (musb->ops->set_toggle)
2446 musb->io.set_toggle = musb->ops->set_toggle;
2447 else
2448 musb->io.set_toggle = musb_default_set_toggle;
2449
2450 if (IS_ENABLED(CONFIG_USB_PHY) && musb->xceiv && !musb->xceiv->io_ops) {
2451 musb->xceiv->io_dev = musb->controller;
2452 musb->xceiv->io_priv = musb->mregs;
2453 musb->xceiv->io_ops = &musb_ulpi_access;
2454 }
2455
2456 if (musb->ops->phy_callback)
2457 musb_phy_callback = musb->ops->phy_callback;
2458
2459 /*
2460 * We need musb_read/write functions initialized for PM.
2461 * Note that at least 2430 glue needs autosuspend delay
2462 * somewhere above 300 ms for the hardware to idle properly
2463 * after disconnecting the cable in host mode. Let's use
2464 * 500 ms for some margin.
2465 */
2466 pm_runtime_use_autosuspend(musb->controller);
2467 pm_runtime_set_autosuspend_delay(musb->controller, 500);
2468 pm_runtime_enable(musb->controller);
2469 pm_runtime_get_sync(musb->controller);
2470
2471 status = usb_phy_init(musb->xceiv);
2472 if (status < 0)
2473 goto err_usb_phy_init;
2474
2475 if (use_dma && dev->dma_mask) {
2476 musb->dma_controller =
2477 musb_dma_controller_create(musb, musb->mregs);
2478 if (IS_ERR(musb->dma_controller)) {
2479 status = PTR_ERR(musb->dma_controller);
2480 goto fail2_5;
2481 }
2482 }
2483
2484 /* be sure interrupts are disabled before connecting ISR */
2485 musb_platform_disable(musb);
2486 musb_disable_interrupts(musb);
2487 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
2488
2489 /* MUSB_POWER_SOFTCONN might be already set, JZ4740 does this. */
2490 musb_writeb(musb->mregs, MUSB_POWER, 0);
2491
2492 /* Init IRQ workqueue before request_irq */
2493 INIT_DELAYED_WORK(&musb->irq_work, musb_irq_work);
2494 INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
2495 INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume);
2496
2497 /* setup musb parts of the core (especially endpoints) */
2498 status = musb_core_init(plat->config->multipoint
2499 ? MUSB_CONTROLLER_MHDRC
2500 : MUSB_CONTROLLER_HDRC, musb);
2501 if (status < 0)
2502 goto fail3;
2503
2504 timer_setup(&musb->otg_timer, musb_otg_timer_func, 0);
2505
2506 /* attach to the IRQ */
2507 if (request_irq(nIrq, musb->isr, IRQF_SHARED, dev_name(dev), musb)) {
2508 dev_err(dev, "request_irq %d failed!\n", nIrq);
2509 status = -ENODEV;
2510 goto fail3;
2511 }
2512 musb->nIrq = nIrq;
2513 /* FIXME this handles wakeup irqs wrong */
2514 if (enable_irq_wake(nIrq) == 0) {
2515 musb->irq_wake = 1;
2516 device_init_wakeup(dev, 1);
2517 } else {
2518 musb->irq_wake = 0;
2519 }
2520
2521 /* program PHY to use external vBus if required */
2522 if (plat->extvbus) {
2523 u8 busctl = musb_readb(musb->mregs, MUSB_ULPI_BUSCONTROL);
2524 busctl |= MUSB_ULPI_USE_EXTVBUS;
2525 musb_writeb(musb->mregs, MUSB_ULPI_BUSCONTROL, busctl);
2526 }
2527
2528 MUSB_DEV_MODE(musb);
2529 musb_set_state(musb, OTG_STATE_B_IDLE);
2530
2531 switch (musb->port_mode) {
2532 case MUSB_HOST:
2533 status = musb_host_setup(musb, plat->power);
2534 if (status < 0)
2535 goto fail3;
2536 status = musb_platform_set_mode(musb, MUSB_HOST);
2537 break;
2538 case MUSB_PERIPHERAL:
2539 status = musb_gadget_setup(musb);
2540 if (status < 0)
2541 goto fail3;
2542 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
2543 break;
2544 case MUSB_OTG:
2545 status = musb_host_setup(musb, plat->power);
2546 if (status < 0)
2547 goto fail3;
2548 status = musb_gadget_setup(musb);
2549 if (status) {
2550 musb_host_cleanup(musb);
2551 goto fail3;
2552 }
2553 status = musb_platform_set_mode(musb, MUSB_OTG);
2554 break;
2555 default:
2556 dev_err(dev, "unsupported port mode %d\n", musb->port_mode);
2557 break;
2558 }
2559
2560 if (status < 0)
2561 goto fail3;
2562
2563 musb_init_debugfs(musb);
2564
2565 musb->is_initialized = 1;
2566 pm_runtime_mark_last_busy(musb->controller);
2567 pm_runtime_put_autosuspend(musb->controller);
2568
2569 return 0;
2570
2571fail3:
2572 cancel_delayed_work_sync(&musb->irq_work);
2573 cancel_delayed_work_sync(&musb->finish_resume_work);
2574 cancel_delayed_work_sync(&musb->deassert_reset_work);
2575 if (musb->dma_controller)
2576 musb_dma_controller_destroy(musb->dma_controller);
2577
2578fail2_5:
2579 usb_phy_shutdown(musb->xceiv);
2580
2581err_usb_phy_init:
2582 pm_runtime_dont_use_autosuspend(musb->controller);
2583 pm_runtime_put_sync(musb->controller);
2584 pm_runtime_disable(musb->controller);
2585
2586fail2:
2587 if (musb->irq_wake)
2588 device_init_wakeup(dev, 0);
2589 musb_platform_exit(musb);
2590
2591fail1:
2592 dev_err_probe(musb->controller, status, "%s failed\n", __func__);
2593
2594 musb_free(musb);
2595
2596fail0:
2597
2598 return status;
2599
2600}
2601
2602/*-------------------------------------------------------------------------*/
2603
2604/* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just
2605 * bridge to a platform device; this driver then suffices.
2606 */
2607static int musb_probe(struct platform_device *pdev)
2608{
2609 struct device *dev = &pdev->dev;
2610 int irq = platform_get_irq_byname(pdev, "mc");
2611 void __iomem *base;
2612
2613 if (irq < 0)
2614 return irq;
2615
2616 base = devm_platform_ioremap_resource(pdev, 0);
2617 if (IS_ERR(base))
2618 return PTR_ERR(base);
2619
2620 return musb_init_controller(dev, irq, base);
2621}
2622
2623static void musb_remove(struct platform_device *pdev)
2624{
2625 struct device *dev = &pdev->dev;
2626 struct musb *musb = dev_to_musb(dev);
2627 unsigned long flags;
2628
2629 /* this gets called on rmmod.
2630 * - Host mode: host may still be active
2631 * - Peripheral mode: peripheral is deactivated (or never-activated)
2632 * - OTG mode: both roles are deactivated (or never-activated)
2633 */
2634 musb_exit_debugfs(musb);
2635
2636 cancel_delayed_work_sync(&musb->irq_work);
2637 cancel_delayed_work_sync(&musb->finish_resume_work);
2638 cancel_delayed_work_sync(&musb->deassert_reset_work);
2639 pm_runtime_get_sync(musb->controller);
2640 musb_host_cleanup(musb);
2641 musb_gadget_cleanup(musb);
2642
2643 musb_platform_disable(musb);
2644 spin_lock_irqsave(&musb->lock, flags);
2645 musb_disable_interrupts(musb);
2646 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
2647 spin_unlock_irqrestore(&musb->lock, flags);
2648 musb_platform_exit(musb);
2649
2650 pm_runtime_dont_use_autosuspend(musb->controller);
2651 pm_runtime_put_sync(musb->controller);
2652 pm_runtime_disable(musb->controller);
2653 musb_phy_callback = NULL;
2654 if (musb->dma_controller)
2655 musb_dma_controller_destroy(musb->dma_controller);
2656 usb_phy_shutdown(musb->xceiv);
2657 musb_free(musb);
2658 device_init_wakeup(dev, 0);
2659}
2660
2661#ifdef CONFIG_PM
2662
2663static void musb_save_context(struct musb *musb)
2664{
2665 int i;
2666 void __iomem *musb_base = musb->mregs;
2667 void __iomem *epio;
2668
2669 musb->context.frame = musb_readw(musb_base, MUSB_FRAME);
2670 musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE);
2671 musb->context.busctl = musb_readb(musb_base, MUSB_ULPI_BUSCONTROL);
2672 musb->context.power = musb_readb(musb_base, MUSB_POWER);
2673 musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE);
2674 musb->context.index = musb_readb(musb_base, MUSB_INDEX);
2675 musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL);
2676
2677 for (i = 0; i < musb->config->num_eps; ++i) {
2678 epio = musb->endpoints[i].regs;
2679 if (!epio)
2680 continue;
2681
2682 musb_writeb(musb_base, MUSB_INDEX, i);
2683 musb->context.index_regs[i].txmaxp =
2684 musb_readw(epio, MUSB_TXMAXP);
2685 musb->context.index_regs[i].txcsr =
2686 musb_readw(epio, MUSB_TXCSR);
2687 musb->context.index_regs[i].rxmaxp =
2688 musb_readw(epio, MUSB_RXMAXP);
2689 musb->context.index_regs[i].rxcsr =
2690 musb_readw(epio, MUSB_RXCSR);
2691
2692 if (musb->dyn_fifo) {
2693 musb->context.index_regs[i].txfifoadd =
2694 musb_readw(musb_base, MUSB_TXFIFOADD);
2695 musb->context.index_regs[i].rxfifoadd =
2696 musb_readw(musb_base, MUSB_RXFIFOADD);
2697 musb->context.index_regs[i].txfifosz =
2698 musb_readb(musb_base, MUSB_TXFIFOSZ);
2699 musb->context.index_regs[i].rxfifosz =
2700 musb_readb(musb_base, MUSB_RXFIFOSZ);
2701 }
2702
2703 musb->context.index_regs[i].txtype =
2704 musb_readb(epio, MUSB_TXTYPE);
2705 musb->context.index_regs[i].txinterval =
2706 musb_readb(epio, MUSB_TXINTERVAL);
2707 musb->context.index_regs[i].rxtype =
2708 musb_readb(epio, MUSB_RXTYPE);
2709 musb->context.index_regs[i].rxinterval =
2710 musb_readb(epio, MUSB_RXINTERVAL);
2711
2712 musb->context.index_regs[i].txfunaddr =
2713 musb_read_txfunaddr(musb, i);
2714 musb->context.index_regs[i].txhubaddr =
2715 musb_read_txhubaddr(musb, i);
2716 musb->context.index_regs[i].txhubport =
2717 musb_read_txhubport(musb, i);
2718
2719 musb->context.index_regs[i].rxfunaddr =
2720 musb_read_rxfunaddr(musb, i);
2721 musb->context.index_regs[i].rxhubaddr =
2722 musb_read_rxhubaddr(musb, i);
2723 musb->context.index_regs[i].rxhubport =
2724 musb_read_rxhubport(musb, i);
2725 }
2726}
2727
2728static void musb_restore_context(struct musb *musb)
2729{
2730 int i;
2731 void __iomem *musb_base = musb->mregs;
2732 void __iomem *epio;
2733 u8 power;
2734
2735 musb_writew(musb_base, MUSB_FRAME, musb->context.frame);
2736 musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode);
2737 musb_writeb(musb_base, MUSB_ULPI_BUSCONTROL, musb->context.busctl);
2738
2739 /* Don't affect SUSPENDM/RESUME bits in POWER reg */
2740 power = musb_readb(musb_base, MUSB_POWER);
2741 power &= MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME;
2742 musb->context.power &= ~(MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME);
2743 power |= musb->context.power;
2744 musb_writeb(musb_base, MUSB_POWER, power);
2745
2746 musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe);
2747 musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe);
2748 musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe);
2749 if (musb->context.devctl & MUSB_DEVCTL_SESSION)
2750 musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);
2751
2752 for (i = 0; i < musb->config->num_eps; ++i) {
2753 epio = musb->endpoints[i].regs;
2754 if (!epio)
2755 continue;
2756
2757 musb_writeb(musb_base, MUSB_INDEX, i);
2758 musb_writew(epio, MUSB_TXMAXP,
2759 musb->context.index_regs[i].txmaxp);
2760 musb_writew(epio, MUSB_TXCSR,
2761 musb->context.index_regs[i].txcsr);
2762 musb_writew(epio, MUSB_RXMAXP,
2763 musb->context.index_regs[i].rxmaxp);
2764 musb_writew(epio, MUSB_RXCSR,
2765 musb->context.index_regs[i].rxcsr);
2766
2767 if (musb->dyn_fifo) {
2768 musb_writeb(musb_base, MUSB_TXFIFOSZ,
2769 musb->context.index_regs[i].txfifosz);
2770 musb_writeb(musb_base, MUSB_RXFIFOSZ,
2771 musb->context.index_regs[i].rxfifosz);
2772 musb_writew(musb_base, MUSB_TXFIFOADD,
2773 musb->context.index_regs[i].txfifoadd);
2774 musb_writew(musb_base, MUSB_RXFIFOADD,
2775 musb->context.index_regs[i].rxfifoadd);
2776 }
2777
2778 musb_writeb(epio, MUSB_TXTYPE,
2779 musb->context.index_regs[i].txtype);
2780 musb_writeb(epio, MUSB_TXINTERVAL,
2781 musb->context.index_regs[i].txinterval);
2782 musb_writeb(epio, MUSB_RXTYPE,
2783 musb->context.index_regs[i].rxtype);
2784 musb_writeb(epio, MUSB_RXINTERVAL,
2785
2786 musb->context.index_regs[i].rxinterval);
2787 musb_write_txfunaddr(musb, i,
2788 musb->context.index_regs[i].txfunaddr);
2789 musb_write_txhubaddr(musb, i,
2790 musb->context.index_regs[i].txhubaddr);
2791 musb_write_txhubport(musb, i,
2792 musb->context.index_regs[i].txhubport);
2793
2794 musb_write_rxfunaddr(musb, i,
2795 musb->context.index_regs[i].rxfunaddr);
2796 musb_write_rxhubaddr(musb, i,
2797 musb->context.index_regs[i].rxhubaddr);
2798 musb_write_rxhubport(musb, i,
2799 musb->context.index_regs[i].rxhubport);
2800 }
2801 musb_writeb(musb_base, MUSB_INDEX, musb->context.index);
2802}
2803
2804static int musb_suspend(struct device *dev)
2805{
2806 struct musb *musb = dev_to_musb(dev);
2807 unsigned long flags;
2808 int ret;
2809
2810 ret = pm_runtime_get_sync(dev);
2811 if (ret < 0) {
2812 pm_runtime_put_noidle(dev);
2813 return ret;
2814 }
2815
2816 musb_platform_disable(musb);
2817 musb_disable_interrupts(musb);
2818
2819 musb->flush_irq_work = true;
2820 while (flush_delayed_work(&musb->irq_work))
2821 ;
2822 musb->flush_irq_work = false;
2823
2824 if (!(musb->ops->quirks & MUSB_PRESERVE_SESSION))
2825 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
2826
2827 WARN_ON(!list_empty(&musb->pending_list));
2828
2829 spin_lock_irqsave(&musb->lock, flags);
2830
2831 if (is_peripheral_active(musb)) {
2832 /* FIXME force disconnect unless we know USB will wake
2833 * the system up quickly enough to respond ...
2834 */
2835 } else if (is_host_active(musb)) {
2836 /* we know all the children are suspended; sometimes
2837 * they will even be wakeup-enabled.
2838 */
2839 }
2840
2841 musb_save_context(musb);
2842
2843 spin_unlock_irqrestore(&musb->lock, flags);
2844 return 0;
2845}
2846
2847static int musb_resume(struct device *dev)
2848{
2849 struct musb *musb = dev_to_musb(dev);
2850 unsigned long flags;
2851 int error;
2852 u8 devctl;
2853 u8 mask;
2854
2855 /*
2856 * For static cmos like DaVinci, register values were preserved
2857 * unless for some reason the whole soc powered down or the USB
2858 * module got reset through the PSC (vs just being disabled).
2859 *
2860 * For the DSPS glue layer though, a full register restore has to
2861 * be done. As it shouldn't harm other platforms, we do it
2862 * unconditionally.
2863 */
2864
2865 musb_restore_context(musb);
2866
2867 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2868 mask = MUSB_DEVCTL_BDEVICE | MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV;
2869 if ((devctl & mask) != (musb->context.devctl & mask))
2870 musb->port1_status = 0;
2871
2872 musb_enable_interrupts(musb);
2873 musb_platform_enable(musb);
2874
2875 /* session might be disabled in suspend */
2876 if (musb->port_mode == MUSB_HOST &&
2877 !(musb->ops->quirks & MUSB_PRESERVE_SESSION)) {
2878 devctl |= MUSB_DEVCTL_SESSION;
2879 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
2880 }
2881
2882 spin_lock_irqsave(&musb->lock, flags);
2883 error = musb_run_resume_work(musb);
2884 if (error)
2885 dev_err(musb->controller, "resume work failed with %i\n",
2886 error);
2887 spin_unlock_irqrestore(&musb->lock, flags);
2888
2889 pm_runtime_mark_last_busy(dev);
2890 pm_runtime_put_autosuspend(dev);
2891
2892 return 0;
2893}
2894
2895static int musb_runtime_suspend(struct device *dev)
2896{
2897 struct musb *musb = dev_to_musb(dev);
2898
2899 musb_save_context(musb);
2900 musb->is_runtime_suspended = 1;
2901
2902 return 0;
2903}
2904
2905static int musb_runtime_resume(struct device *dev)
2906{
2907 struct musb *musb = dev_to_musb(dev);
2908 unsigned long flags;
2909 int error;
2910
2911 /*
2912 * When pm_runtime_get_sync called for the first time in driver
2913 * init, some of the structure is still not initialized which is
2914 * used in restore function. But clock needs to be
2915 * enabled before any register access, so
2916 * pm_runtime_get_sync has to be called.
2917 * Also context restore without save does not make
2918 * any sense
2919 */
2920 if (!musb->is_initialized)
2921 return 0;
2922
2923 musb_restore_context(musb);
2924
2925 spin_lock_irqsave(&musb->lock, flags);
2926 error = musb_run_resume_work(musb);
2927 if (error)
2928 dev_err(musb->controller, "resume work failed with %i\n",
2929 error);
2930 musb->is_runtime_suspended = 0;
2931 spin_unlock_irqrestore(&musb->lock, flags);
2932
2933 return 0;
2934}
2935
2936static const struct dev_pm_ops musb_dev_pm_ops = {
2937 .suspend = musb_suspend,
2938 .resume = musb_resume,
2939 .runtime_suspend = musb_runtime_suspend,
2940 .runtime_resume = musb_runtime_resume,
2941};
2942
2943#define MUSB_DEV_PM_OPS (&musb_dev_pm_ops)
2944#else
2945#define MUSB_DEV_PM_OPS NULL
2946#endif
2947
2948static struct platform_driver musb_driver = {
2949 .driver = {
2950 .name = musb_driver_name,
2951 .bus = &platform_bus_type,
2952 .pm = MUSB_DEV_PM_OPS,
2953 .dev_groups = musb_groups,
2954 },
2955 .probe = musb_probe,
2956 .remove_new = musb_remove,
2957};
2958
2959module_platform_driver(musb_driver);
1/*
2 * MUSB OTG driver core code
3 *
4 * Copyright 2005 Mentor Graphics Corporation
5 * Copyright (C) 2005-2006 by Texas Instruments
6 * Copyright (C) 2006-2007 Nokia Corporation
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
25 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
29 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35/*
36 * Inventra (Multipoint) Dual-Role Controller Driver for Linux.
37 *
38 * This consists of a Host Controller Driver (HCD) and a peripheral
39 * controller driver implementing the "Gadget" API; OTG support is
40 * in the works. These are normal Linux-USB controller drivers which
41 * use IRQs and have no dedicated thread.
42 *
43 * This version of the driver has only been used with products from
44 * Texas Instruments. Those products integrate the Inventra logic
45 * with other DMA, IRQ, and bus modules, as well as other logic that
46 * needs to be reflected in this driver.
47 *
48 *
49 * NOTE: the original Mentor code here was pretty much a collection
50 * of mechanisms that don't seem to have been fully integrated/working
51 * for *any* Linux kernel version. This version aims at Linux 2.6.now,
52 * Key open issues include:
53 *
54 * - Lack of host-side transaction scheduling, for all transfer types.
55 * The hardware doesn't do it; instead, software must.
56 *
57 * This is not an issue for OTG devices that don't support external
58 * hubs, but for more "normal" USB hosts it's a user issue that the
59 * "multipoint" support doesn't scale in the expected ways. That
60 * includes DaVinci EVM in a common non-OTG mode.
61 *
62 * * Control and bulk use dedicated endpoints, and there's as
63 * yet no mechanism to either (a) reclaim the hardware when
64 * peripherals are NAKing, which gets complicated with bulk
65 * endpoints, or (b) use more than a single bulk endpoint in
66 * each direction.
67 *
68 * RESULT: one device may be perceived as blocking another one.
69 *
70 * * Interrupt and isochronous will dynamically allocate endpoint
71 * hardware, but (a) there's no record keeping for bandwidth;
72 * (b) in the common case that few endpoints are available, there
73 * is no mechanism to reuse endpoints to talk to multiple devices.
74 *
75 * RESULT: At one extreme, bandwidth can be overcommitted in
76 * some hardware configurations, no faults will be reported.
77 * At the other extreme, the bandwidth capabilities which do
78 * exist tend to be severely undercommitted. You can't yet hook
79 * up both a keyboard and a mouse to an external USB hub.
80 */
81
82/*
83 * This gets many kinds of configuration information:
84 * - Kconfig for everything user-configurable
85 * - platform_device for addressing, irq, and platform_data
86 * - platform_data is mostly for board-specific information
87 * (plus recentrly, SOC or family details)
88 *
89 * Most of the conditional compilation will (someday) vanish.
90 */
91
92#include <linux/module.h>
93#include <linux/kernel.h>
94#include <linux/sched.h>
95#include <linux/slab.h>
96#include <linux/list.h>
97#include <linux/kobject.h>
98#include <linux/prefetch.h>
99#include <linux/platform_device.h>
100#include <linux/io.h>
101#include <linux/dma-mapping.h>
102#include <linux/usb.h>
103#include <linux/usb/of.h>
104
105#include "musb_core.h"
106#include "musb_trace.h"
107
108#define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON)
109
110
111#define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia"
112#define DRIVER_DESC "Inventra Dual-Role USB Controller Driver"
113
114#define MUSB_VERSION "6.0"
115
116#define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION
117
118#define MUSB_DRIVER_NAME "musb-hdrc"
119const char musb_driver_name[] = MUSB_DRIVER_NAME;
120
121MODULE_DESCRIPTION(DRIVER_INFO);
122MODULE_AUTHOR(DRIVER_AUTHOR);
123MODULE_LICENSE("GPL");
124MODULE_ALIAS("platform:" MUSB_DRIVER_NAME);
125
126
127/*-------------------------------------------------------------------------*/
128
129static inline struct musb *dev_to_musb(struct device *dev)
130{
131 return dev_get_drvdata(dev);
132}
133
134enum musb_mode musb_get_mode(struct device *dev)
135{
136 enum usb_dr_mode mode;
137
138 mode = usb_get_dr_mode(dev);
139 switch (mode) {
140 case USB_DR_MODE_HOST:
141 return MUSB_HOST;
142 case USB_DR_MODE_PERIPHERAL:
143 return MUSB_PERIPHERAL;
144 case USB_DR_MODE_OTG:
145 case USB_DR_MODE_UNKNOWN:
146 default:
147 return MUSB_OTG;
148 }
149}
150EXPORT_SYMBOL_GPL(musb_get_mode);
151
152/*-------------------------------------------------------------------------*/
153
154#ifndef CONFIG_BLACKFIN
155static int musb_ulpi_read(struct usb_phy *phy, u32 reg)
156{
157 void __iomem *addr = phy->io_priv;
158 int i = 0;
159 u8 r;
160 u8 power;
161 int ret;
162
163 pm_runtime_get_sync(phy->io_dev);
164
165 /* Make sure the transceiver is not in low power mode */
166 power = musb_readb(addr, MUSB_POWER);
167 power &= ~MUSB_POWER_SUSPENDM;
168 musb_writeb(addr, MUSB_POWER, power);
169
170 /* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the
171 * ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM.
172 */
173
174 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
175 musb_writeb(addr, MUSB_ULPI_REG_CONTROL,
176 MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR);
177
178 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
179 & MUSB_ULPI_REG_CMPLT)) {
180 i++;
181 if (i == 10000) {
182 ret = -ETIMEDOUT;
183 goto out;
184 }
185
186 }
187 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
188 r &= ~MUSB_ULPI_REG_CMPLT;
189 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
190
191 ret = musb_readb(addr, MUSB_ULPI_REG_DATA);
192
193out:
194 pm_runtime_put(phy->io_dev);
195
196 return ret;
197}
198
199static int musb_ulpi_write(struct usb_phy *phy, u32 val, u32 reg)
200{
201 void __iomem *addr = phy->io_priv;
202 int i = 0;
203 u8 r = 0;
204 u8 power;
205 int ret = 0;
206
207 pm_runtime_get_sync(phy->io_dev);
208
209 /* Make sure the transceiver is not in low power mode */
210 power = musb_readb(addr, MUSB_POWER);
211 power &= ~MUSB_POWER_SUSPENDM;
212 musb_writeb(addr, MUSB_POWER, power);
213
214 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
215 musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)val);
216 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ);
217
218 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
219 & MUSB_ULPI_REG_CMPLT)) {
220 i++;
221 if (i == 10000) {
222 ret = -ETIMEDOUT;
223 goto out;
224 }
225 }
226
227 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
228 r &= ~MUSB_ULPI_REG_CMPLT;
229 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
230
231out:
232 pm_runtime_put(phy->io_dev);
233
234 return ret;
235}
236#else
237#define musb_ulpi_read NULL
238#define musb_ulpi_write NULL
239#endif
240
241static struct usb_phy_io_ops musb_ulpi_access = {
242 .read = musb_ulpi_read,
243 .write = musb_ulpi_write,
244};
245
246/*-------------------------------------------------------------------------*/
247
248static u32 musb_default_fifo_offset(u8 epnum)
249{
250 return 0x20 + (epnum * 4);
251}
252
253/* "flat" mapping: each endpoint has its own i/o address */
254static void musb_flat_ep_select(void __iomem *mbase, u8 epnum)
255{
256}
257
258static u32 musb_flat_ep_offset(u8 epnum, u16 offset)
259{
260 return 0x100 + (0x10 * epnum) + offset;
261}
262
263/* "indexed" mapping: INDEX register controls register bank select */
264static void musb_indexed_ep_select(void __iomem *mbase, u8 epnum)
265{
266 musb_writeb(mbase, MUSB_INDEX, epnum);
267}
268
269static u32 musb_indexed_ep_offset(u8 epnum, u16 offset)
270{
271 return 0x10 + offset;
272}
273
274static u32 musb_default_busctl_offset(u8 epnum, u16 offset)
275{
276 return 0x80 + (0x08 * epnum) + offset;
277}
278
279static u8 musb_default_readb(const void __iomem *addr, unsigned offset)
280{
281 u8 data = __raw_readb(addr + offset);
282
283 trace_musb_readb(__builtin_return_address(0), addr, offset, data);
284 return data;
285}
286
287static void musb_default_writeb(void __iomem *addr, unsigned offset, u8 data)
288{
289 trace_musb_writeb(__builtin_return_address(0), addr, offset, data);
290 __raw_writeb(data, addr + offset);
291}
292
293static u16 musb_default_readw(const void __iomem *addr, unsigned offset)
294{
295 u16 data = __raw_readw(addr + offset);
296
297 trace_musb_readw(__builtin_return_address(0), addr, offset, data);
298 return data;
299}
300
301static void musb_default_writew(void __iomem *addr, unsigned offset, u16 data)
302{
303 trace_musb_writew(__builtin_return_address(0), addr, offset, data);
304 __raw_writew(data, addr + offset);
305}
306
307static u32 musb_default_readl(const void __iomem *addr, unsigned offset)
308{
309 u32 data = __raw_readl(addr + offset);
310
311 trace_musb_readl(__builtin_return_address(0), addr, offset, data);
312 return data;
313}
314
315static void musb_default_writel(void __iomem *addr, unsigned offset, u32 data)
316{
317 trace_musb_writel(__builtin_return_address(0), addr, offset, data);
318 __raw_writel(data, addr + offset);
319}
320
321/*
322 * Load an endpoint's FIFO
323 */
324static void musb_default_write_fifo(struct musb_hw_ep *hw_ep, u16 len,
325 const u8 *src)
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 prefetch((u8 *)src);
334
335 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
336 'T', hw_ep->epnum, fifo, len, src);
337
338 /* we can't assume unaligned reads work */
339 if (likely((0x01 & (unsigned long) src) == 0)) {
340 u16 index = 0;
341
342 /* best case is 32bit-aligned source address */
343 if ((0x02 & (unsigned long) src) == 0) {
344 if (len >= 4) {
345 iowrite32_rep(fifo, src + index, len >> 2);
346 index += len & ~0x03;
347 }
348 if (len & 0x02) {
349 __raw_writew(*(u16 *)&src[index], fifo);
350 index += 2;
351 }
352 } else {
353 if (len >= 2) {
354 iowrite16_rep(fifo, src + index, len >> 1);
355 index += len & ~0x01;
356 }
357 }
358 if (len & 0x01)
359 __raw_writeb(src[index], fifo);
360 } else {
361 /* byte aligned */
362 iowrite8_rep(fifo, src, len);
363 }
364}
365
366/*
367 * Unload an endpoint's FIFO
368 */
369static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
370{
371 struct musb *musb = hw_ep->musb;
372 void __iomem *fifo = hw_ep->fifo;
373
374 if (unlikely(len == 0))
375 return;
376
377 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
378 'R', hw_ep->epnum, fifo, len, dst);
379
380 /* we can't assume unaligned writes work */
381 if (likely((0x01 & (unsigned long) dst) == 0)) {
382 u16 index = 0;
383
384 /* best case is 32bit-aligned destination address */
385 if ((0x02 & (unsigned long) dst) == 0) {
386 if (len >= 4) {
387 ioread32_rep(fifo, dst, len >> 2);
388 index = len & ~0x03;
389 }
390 if (len & 0x02) {
391 *(u16 *)&dst[index] = __raw_readw(fifo);
392 index += 2;
393 }
394 } else {
395 if (len >= 2) {
396 ioread16_rep(fifo, dst, len >> 1);
397 index = len & ~0x01;
398 }
399 }
400 if (len & 0x01)
401 dst[index] = __raw_readb(fifo);
402 } else {
403 /* byte aligned */
404 ioread8_rep(fifo, dst, len);
405 }
406}
407
408/*
409 * Old style IO functions
410 */
411u8 (*musb_readb)(const void __iomem *addr, unsigned offset);
412EXPORT_SYMBOL_GPL(musb_readb);
413
414void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
415EXPORT_SYMBOL_GPL(musb_writeb);
416
417u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
418EXPORT_SYMBOL_GPL(musb_readw);
419
420void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
421EXPORT_SYMBOL_GPL(musb_writew);
422
423u32 (*musb_readl)(const void __iomem *addr, unsigned offset);
424EXPORT_SYMBOL_GPL(musb_readl);
425
426void (*musb_writel)(void __iomem *addr, unsigned offset, u32 data);
427EXPORT_SYMBOL_GPL(musb_writel);
428
429#ifndef CONFIG_MUSB_PIO_ONLY
430struct dma_controller *
431(*musb_dma_controller_create)(struct musb *musb, void __iomem *base);
432EXPORT_SYMBOL(musb_dma_controller_create);
433
434void (*musb_dma_controller_destroy)(struct dma_controller *c);
435EXPORT_SYMBOL(musb_dma_controller_destroy);
436#endif
437
438/*
439 * New style IO functions
440 */
441void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
442{
443 return hw_ep->musb->io.read_fifo(hw_ep, len, dst);
444}
445
446void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
447{
448 return hw_ep->musb->io.write_fifo(hw_ep, len, src);
449}
450
451/*-------------------------------------------------------------------------*/
452
453/* for high speed test mode; see USB 2.0 spec 7.1.20 */
454static const u8 musb_test_packet[53] = {
455 /* implicit SYNC then DATA0 to start */
456
457 /* JKJKJKJK x9 */
458 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
459 /* JJKKJJKK x8 */
460 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
461 /* JJJJKKKK x8 */
462 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
463 /* JJJJJJJKKKKKKK x8 */
464 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
465 /* JJJJJJJK x8 */
466 0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd,
467 /* JKKKKKKK x10, JK */
468 0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e
469
470 /* implicit CRC16 then EOP to end */
471};
472
473void musb_load_testpacket(struct musb *musb)
474{
475 void __iomem *regs = musb->endpoints[0].regs;
476
477 musb_ep_select(musb->mregs, 0);
478 musb_write_fifo(musb->control_ep,
479 sizeof(musb_test_packet), musb_test_packet);
480 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY);
481}
482
483/*-------------------------------------------------------------------------*/
484
485/*
486 * Handles OTG hnp timeouts, such as b_ase0_brst
487 */
488static void musb_otg_timer_func(unsigned long data)
489{
490 struct musb *musb = (struct musb *)data;
491 unsigned long flags;
492
493 spin_lock_irqsave(&musb->lock, flags);
494 switch (musb->xceiv->otg->state) {
495 case OTG_STATE_B_WAIT_ACON:
496 musb_dbg(musb,
497 "HNP: b_wait_acon timeout; back to b_peripheral");
498 musb_g_disconnect(musb);
499 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
500 musb->is_active = 0;
501 break;
502 case OTG_STATE_A_SUSPEND:
503 case OTG_STATE_A_WAIT_BCON:
504 musb_dbg(musb, "HNP: %s timeout",
505 usb_otg_state_string(musb->xceiv->otg->state));
506 musb_platform_set_vbus(musb, 0);
507 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
508 break;
509 default:
510 musb_dbg(musb, "HNP: Unhandled mode %s",
511 usb_otg_state_string(musb->xceiv->otg->state));
512 }
513 spin_unlock_irqrestore(&musb->lock, flags);
514}
515
516/*
517 * Stops the HNP transition. Caller must take care of locking.
518 */
519void musb_hnp_stop(struct musb *musb)
520{
521 struct usb_hcd *hcd = musb->hcd;
522 void __iomem *mbase = musb->mregs;
523 u8 reg;
524
525 musb_dbg(musb, "HNP: stop from %s",
526 usb_otg_state_string(musb->xceiv->otg->state));
527
528 switch (musb->xceiv->otg->state) {
529 case OTG_STATE_A_PERIPHERAL:
530 musb_g_disconnect(musb);
531 musb_dbg(musb, "HNP: back to %s",
532 usb_otg_state_string(musb->xceiv->otg->state));
533 break;
534 case OTG_STATE_B_HOST:
535 musb_dbg(musb, "HNP: Disabling HR");
536 if (hcd)
537 hcd->self.is_b_host = 0;
538 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
539 MUSB_DEV_MODE(musb);
540 reg = musb_readb(mbase, MUSB_POWER);
541 reg |= MUSB_POWER_SUSPENDM;
542 musb_writeb(mbase, MUSB_POWER, reg);
543 /* REVISIT: Start SESSION_REQUEST here? */
544 break;
545 default:
546 musb_dbg(musb, "HNP: Stopping in unknown state %s",
547 usb_otg_state_string(musb->xceiv->otg->state));
548 }
549
550 /*
551 * When returning to A state after HNP, avoid hub_port_rebounce(),
552 * which cause occasional OPT A "Did not receive reset after connect"
553 * errors.
554 */
555 musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16);
556}
557
558static void musb_recover_from_babble(struct musb *musb);
559
560/*
561 * Interrupt Service Routine to record USB "global" interrupts.
562 * Since these do not happen often and signify things of
563 * paramount importance, it seems OK to check them individually;
564 * the order of the tests is specified in the manual
565 *
566 * @param musb instance pointer
567 * @param int_usb register contents
568 * @param devctl
569 * @param power
570 */
571
572static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
573 u8 devctl)
574{
575 irqreturn_t handled = IRQ_NONE;
576
577 musb_dbg(musb, "<== DevCtl=%02x, int_usb=0x%x", devctl, int_usb);
578
579 /* in host mode, the peripheral may issue remote wakeup.
580 * in peripheral mode, the host may resume the link.
581 * spurious RESUME irqs happen too, paired with SUSPEND.
582 */
583 if (int_usb & MUSB_INTR_RESUME) {
584 handled = IRQ_HANDLED;
585 musb_dbg(musb, "RESUME (%s)",
586 usb_otg_state_string(musb->xceiv->otg->state));
587
588 if (devctl & MUSB_DEVCTL_HM) {
589 switch (musb->xceiv->otg->state) {
590 case OTG_STATE_A_SUSPEND:
591 /* remote wakeup? */
592 musb->port1_status |=
593 (USB_PORT_STAT_C_SUSPEND << 16)
594 | MUSB_PORT_STAT_RESUME;
595 musb->rh_timer = jiffies
596 + msecs_to_jiffies(USB_RESUME_TIMEOUT);
597 musb->xceiv->otg->state = OTG_STATE_A_HOST;
598 musb->is_active = 1;
599 musb_host_resume_root_hub(musb);
600 schedule_delayed_work(&musb->finish_resume_work,
601 msecs_to_jiffies(USB_RESUME_TIMEOUT));
602 break;
603 case OTG_STATE_B_WAIT_ACON:
604 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
605 musb->is_active = 1;
606 MUSB_DEV_MODE(musb);
607 break;
608 default:
609 WARNING("bogus %s RESUME (%s)\n",
610 "host",
611 usb_otg_state_string(musb->xceiv->otg->state));
612 }
613 } else {
614 switch (musb->xceiv->otg->state) {
615 case OTG_STATE_A_SUSPEND:
616 /* possibly DISCONNECT is upcoming */
617 musb->xceiv->otg->state = OTG_STATE_A_HOST;
618 musb_host_resume_root_hub(musb);
619 break;
620 case OTG_STATE_B_WAIT_ACON:
621 case OTG_STATE_B_PERIPHERAL:
622 /* disconnect while suspended? we may
623 * not get a disconnect irq...
624 */
625 if ((devctl & MUSB_DEVCTL_VBUS)
626 != (3 << MUSB_DEVCTL_VBUS_SHIFT)
627 ) {
628 musb->int_usb |= MUSB_INTR_DISCONNECT;
629 musb->int_usb &= ~MUSB_INTR_SUSPEND;
630 break;
631 }
632 musb_g_resume(musb);
633 break;
634 case OTG_STATE_B_IDLE:
635 musb->int_usb &= ~MUSB_INTR_SUSPEND;
636 break;
637 default:
638 WARNING("bogus %s RESUME (%s)\n",
639 "peripheral",
640 usb_otg_state_string(musb->xceiv->otg->state));
641 }
642 }
643 }
644
645 /* see manual for the order of the tests */
646 if (int_usb & MUSB_INTR_SESSREQ) {
647 void __iomem *mbase = musb->mregs;
648
649 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS
650 && (devctl & MUSB_DEVCTL_BDEVICE)) {
651 musb_dbg(musb, "SessReq while on B state");
652 return IRQ_HANDLED;
653 }
654
655 musb_dbg(musb, "SESSION_REQUEST (%s)",
656 usb_otg_state_string(musb->xceiv->otg->state));
657
658 /* IRQ arrives from ID pin sense or (later, if VBUS power
659 * is removed) SRP. responses are time critical:
660 * - turn on VBUS (with silicon-specific mechanism)
661 * - go through A_WAIT_VRISE
662 * - ... to A_WAIT_BCON.
663 * a_wait_vrise_tmout triggers VBUS_ERROR transitions
664 */
665 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
666 musb->ep0_stage = MUSB_EP0_START;
667 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
668 MUSB_HST_MODE(musb);
669 musb_platform_set_vbus(musb, 1);
670
671 handled = IRQ_HANDLED;
672 }
673
674 if (int_usb & MUSB_INTR_VBUSERROR) {
675 int ignore = 0;
676
677 /* During connection as an A-Device, we may see a short
678 * current spikes causing voltage drop, because of cable
679 * and peripheral capacitance combined with vbus draw.
680 * (So: less common with truly self-powered devices, where
681 * vbus doesn't act like a power supply.)
682 *
683 * Such spikes are short; usually less than ~500 usec, max
684 * of ~2 msec. That is, they're not sustained overcurrent
685 * errors, though they're reported using VBUSERROR irqs.
686 *
687 * Workarounds: (a) hardware: use self powered devices.
688 * (b) software: ignore non-repeated VBUS errors.
689 *
690 * REVISIT: do delays from lots of DEBUG_KERNEL checks
691 * make trouble here, keeping VBUS < 4.4V ?
692 */
693 switch (musb->xceiv->otg->state) {
694 case OTG_STATE_A_HOST:
695 /* recovery is dicey once we've gotten past the
696 * initial stages of enumeration, but if VBUS
697 * stayed ok at the other end of the link, and
698 * another reset is due (at least for high speed,
699 * to redo the chirp etc), it might work OK...
700 */
701 case OTG_STATE_A_WAIT_BCON:
702 case OTG_STATE_A_WAIT_VRISE:
703 if (musb->vbuserr_retry) {
704 void __iomem *mbase = musb->mregs;
705
706 musb->vbuserr_retry--;
707 ignore = 1;
708 devctl |= MUSB_DEVCTL_SESSION;
709 musb_writeb(mbase, MUSB_DEVCTL, devctl);
710 } else {
711 musb->port1_status |=
712 USB_PORT_STAT_OVERCURRENT
713 | (USB_PORT_STAT_C_OVERCURRENT << 16);
714 }
715 break;
716 default:
717 break;
718 }
719
720 dev_printk(ignore ? KERN_DEBUG : KERN_ERR, musb->controller,
721 "VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n",
722 usb_otg_state_string(musb->xceiv->otg->state),
723 devctl,
724 ({ char *s;
725 switch (devctl & MUSB_DEVCTL_VBUS) {
726 case 0 << MUSB_DEVCTL_VBUS_SHIFT:
727 s = "<SessEnd"; break;
728 case 1 << MUSB_DEVCTL_VBUS_SHIFT:
729 s = "<AValid"; break;
730 case 2 << MUSB_DEVCTL_VBUS_SHIFT:
731 s = "<VBusValid"; break;
732 /* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */
733 default:
734 s = "VALID"; break;
735 } s; }),
736 VBUSERR_RETRY_COUNT - musb->vbuserr_retry,
737 musb->port1_status);
738
739 /* go through A_WAIT_VFALL then start a new session */
740 if (!ignore)
741 musb_platform_set_vbus(musb, 0);
742 handled = IRQ_HANDLED;
743 }
744
745 if (int_usb & MUSB_INTR_SUSPEND) {
746 musb_dbg(musb, "SUSPEND (%s) devctl %02x",
747 usb_otg_state_string(musb->xceiv->otg->state), devctl);
748 handled = IRQ_HANDLED;
749
750 switch (musb->xceiv->otg->state) {
751 case OTG_STATE_A_PERIPHERAL:
752 /* We also come here if the cable is removed, since
753 * this silicon doesn't report ID-no-longer-grounded.
754 *
755 * We depend on T(a_wait_bcon) to shut us down, and
756 * hope users don't do anything dicey during this
757 * undesired detour through A_WAIT_BCON.
758 */
759 musb_hnp_stop(musb);
760 musb_host_resume_root_hub(musb);
761 musb_root_disconnect(musb);
762 musb_platform_try_idle(musb, jiffies
763 + msecs_to_jiffies(musb->a_wait_bcon
764 ? : OTG_TIME_A_WAIT_BCON));
765
766 break;
767 case OTG_STATE_B_IDLE:
768 if (!musb->is_active)
769 break;
770 case OTG_STATE_B_PERIPHERAL:
771 musb_g_suspend(musb);
772 musb->is_active = musb->g.b_hnp_enable;
773 if (musb->is_active) {
774 musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
775 musb_dbg(musb, "HNP: Setting timer for b_ase0_brst");
776 mod_timer(&musb->otg_timer, jiffies
777 + msecs_to_jiffies(
778 OTG_TIME_B_ASE0_BRST));
779 }
780 break;
781 case OTG_STATE_A_WAIT_BCON:
782 if (musb->a_wait_bcon != 0)
783 musb_platform_try_idle(musb, jiffies
784 + msecs_to_jiffies(musb->a_wait_bcon));
785 break;
786 case OTG_STATE_A_HOST:
787 musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
788 musb->is_active = musb->hcd->self.b_hnp_enable;
789 break;
790 case OTG_STATE_B_HOST:
791 /* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */
792 musb_dbg(musb, "REVISIT: SUSPEND as B_HOST");
793 break;
794 default:
795 /* "should not happen" */
796 musb->is_active = 0;
797 break;
798 }
799 }
800
801 if (int_usb & MUSB_INTR_CONNECT) {
802 struct usb_hcd *hcd = musb->hcd;
803
804 handled = IRQ_HANDLED;
805 musb->is_active = 1;
806
807 musb->ep0_stage = MUSB_EP0_START;
808
809 musb->intrtxe = musb->epmask;
810 musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe);
811 musb->intrrxe = musb->epmask & 0xfffe;
812 musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe);
813 musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7);
814 musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED
815 |USB_PORT_STAT_HIGH_SPEED
816 |USB_PORT_STAT_ENABLE
817 );
818 musb->port1_status |= USB_PORT_STAT_CONNECTION
819 |(USB_PORT_STAT_C_CONNECTION << 16);
820
821 /* high vs full speed is just a guess until after reset */
822 if (devctl & MUSB_DEVCTL_LSDEV)
823 musb->port1_status |= USB_PORT_STAT_LOW_SPEED;
824
825 /* indicate new connection to OTG machine */
826 switch (musb->xceiv->otg->state) {
827 case OTG_STATE_B_PERIPHERAL:
828 if (int_usb & MUSB_INTR_SUSPEND) {
829 musb_dbg(musb, "HNP: SUSPEND+CONNECT, now b_host");
830 int_usb &= ~MUSB_INTR_SUSPEND;
831 goto b_host;
832 } else
833 musb_dbg(musb, "CONNECT as b_peripheral???");
834 break;
835 case OTG_STATE_B_WAIT_ACON:
836 musb_dbg(musb, "HNP: CONNECT, now b_host");
837b_host:
838 musb->xceiv->otg->state = OTG_STATE_B_HOST;
839 if (musb->hcd)
840 musb->hcd->self.is_b_host = 1;
841 del_timer(&musb->otg_timer);
842 break;
843 default:
844 if ((devctl & MUSB_DEVCTL_VBUS)
845 == (3 << MUSB_DEVCTL_VBUS_SHIFT)) {
846 musb->xceiv->otg->state = OTG_STATE_A_HOST;
847 if (hcd)
848 hcd->self.is_b_host = 0;
849 }
850 break;
851 }
852
853 musb_host_poke_root_hub(musb);
854
855 musb_dbg(musb, "CONNECT (%s) devctl %02x",
856 usb_otg_state_string(musb->xceiv->otg->state), devctl);
857 }
858
859 if (int_usb & MUSB_INTR_DISCONNECT) {
860 musb_dbg(musb, "DISCONNECT (%s) as %s, devctl %02x",
861 usb_otg_state_string(musb->xceiv->otg->state),
862 MUSB_MODE(musb), devctl);
863 handled = IRQ_HANDLED;
864
865 switch (musb->xceiv->otg->state) {
866 case OTG_STATE_A_HOST:
867 case OTG_STATE_A_SUSPEND:
868 musb_host_resume_root_hub(musb);
869 musb_root_disconnect(musb);
870 if (musb->a_wait_bcon != 0)
871 musb_platform_try_idle(musb, jiffies
872 + msecs_to_jiffies(musb->a_wait_bcon));
873 break;
874 case OTG_STATE_B_HOST:
875 /* REVISIT this behaves for "real disconnect"
876 * cases; make sure the other transitions from
877 * from B_HOST act right too. The B_HOST code
878 * in hnp_stop() is currently not used...
879 */
880 musb_root_disconnect(musb);
881 if (musb->hcd)
882 musb->hcd->self.is_b_host = 0;
883 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
884 MUSB_DEV_MODE(musb);
885 musb_g_disconnect(musb);
886 break;
887 case OTG_STATE_A_PERIPHERAL:
888 musb_hnp_stop(musb);
889 musb_root_disconnect(musb);
890 /* FALLTHROUGH */
891 case OTG_STATE_B_WAIT_ACON:
892 /* FALLTHROUGH */
893 case OTG_STATE_B_PERIPHERAL:
894 case OTG_STATE_B_IDLE:
895 musb_g_disconnect(musb);
896 break;
897 default:
898 WARNING("unhandled DISCONNECT transition (%s)\n",
899 usb_otg_state_string(musb->xceiv->otg->state));
900 break;
901 }
902 }
903
904 /* mentor saves a bit: bus reset and babble share the same irq.
905 * only host sees babble; only peripheral sees bus reset.
906 */
907 if (int_usb & MUSB_INTR_RESET) {
908 handled = IRQ_HANDLED;
909 if (devctl & MUSB_DEVCTL_HM) {
910 /*
911 * When BABBLE happens what we can depends on which
912 * platform MUSB is running, because some platforms
913 * implemented proprietary means for 'recovering' from
914 * Babble conditions. One such platform is AM335x. In
915 * most cases, however, the only thing we can do is
916 * drop the session.
917 */
918 dev_err(musb->controller, "Babble\n");
919
920 if (is_host_active(musb))
921 musb_recover_from_babble(musb);
922 } else {
923 musb_dbg(musb, "BUS RESET as %s",
924 usb_otg_state_string(musb->xceiv->otg->state));
925 switch (musb->xceiv->otg->state) {
926 case OTG_STATE_A_SUSPEND:
927 musb_g_reset(musb);
928 /* FALLTHROUGH */
929 case OTG_STATE_A_WAIT_BCON: /* OPT TD.4.7-900ms */
930 /* never use invalid T(a_wait_bcon) */
931 musb_dbg(musb, "HNP: in %s, %d msec timeout",
932 usb_otg_state_string(musb->xceiv->otg->state),
933 TA_WAIT_BCON(musb));
934 mod_timer(&musb->otg_timer, jiffies
935 + msecs_to_jiffies(TA_WAIT_BCON(musb)));
936 break;
937 case OTG_STATE_A_PERIPHERAL:
938 del_timer(&musb->otg_timer);
939 musb_g_reset(musb);
940 break;
941 case OTG_STATE_B_WAIT_ACON:
942 musb_dbg(musb, "HNP: RESET (%s), to b_peripheral",
943 usb_otg_state_string(musb->xceiv->otg->state));
944 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
945 musb_g_reset(musb);
946 break;
947 case OTG_STATE_B_IDLE:
948 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
949 /* FALLTHROUGH */
950 case OTG_STATE_B_PERIPHERAL:
951 musb_g_reset(musb);
952 break;
953 default:
954 musb_dbg(musb, "Unhandled BUS RESET as %s",
955 usb_otg_state_string(musb->xceiv->otg->state));
956 }
957 }
958 }
959
960#if 0
961/* REVISIT ... this would be for multiplexing periodic endpoints, or
962 * supporting transfer phasing to prevent exceeding ISO bandwidth
963 * limits of a given frame or microframe.
964 *
965 * It's not needed for peripheral side, which dedicates endpoints;
966 * though it _might_ use SOF irqs for other purposes.
967 *
968 * And it's not currently needed for host side, which also dedicates
969 * endpoints, relies on TX/RX interval registers, and isn't claimed
970 * to support ISO transfers yet.
971 */
972 if (int_usb & MUSB_INTR_SOF) {
973 void __iomem *mbase = musb->mregs;
974 struct musb_hw_ep *ep;
975 u8 epnum;
976 u16 frame;
977
978 dev_dbg(musb->controller, "START_OF_FRAME\n");
979 handled = IRQ_HANDLED;
980
981 /* start any periodic Tx transfers waiting for current frame */
982 frame = musb_readw(mbase, MUSB_FRAME);
983 ep = musb->endpoints;
984 for (epnum = 1; (epnum < musb->nr_endpoints)
985 && (musb->epmask >= (1 << epnum));
986 epnum++, ep++) {
987 /*
988 * FIXME handle framecounter wraps (12 bits)
989 * eliminate duplicated StartUrb logic
990 */
991 if (ep->dwWaitFrame >= frame) {
992 ep->dwWaitFrame = 0;
993 pr_debug("SOF --> periodic TX%s on %d\n",
994 ep->tx_channel ? " DMA" : "",
995 epnum);
996 if (!ep->tx_channel)
997 musb_h_tx_start(musb, epnum);
998 else
999 cppi_hostdma_start(musb, epnum);
1000 }
1001 } /* end of for loop */
1002 }
1003#endif
1004
1005 schedule_delayed_work(&musb->irq_work, 0);
1006
1007 return handled;
1008}
1009
1010/*-------------------------------------------------------------------------*/
1011
1012static void musb_disable_interrupts(struct musb *musb)
1013{
1014 void __iomem *mbase = musb->mregs;
1015 u16 temp;
1016
1017 /* disable interrupts */
1018 musb_writeb(mbase, MUSB_INTRUSBE, 0);
1019 musb->intrtxe = 0;
1020 musb_writew(mbase, MUSB_INTRTXE, 0);
1021 musb->intrrxe = 0;
1022 musb_writew(mbase, MUSB_INTRRXE, 0);
1023
1024 /* flush pending interrupts */
1025 temp = musb_readb(mbase, MUSB_INTRUSB);
1026 temp = musb_readw(mbase, MUSB_INTRTX);
1027 temp = musb_readw(mbase, MUSB_INTRRX);
1028}
1029
1030static void musb_enable_interrupts(struct musb *musb)
1031{
1032 void __iomem *regs = musb->mregs;
1033
1034 /* Set INT enable registers, enable interrupts */
1035 musb->intrtxe = musb->epmask;
1036 musb_writew(regs, MUSB_INTRTXE, musb->intrtxe);
1037 musb->intrrxe = musb->epmask & 0xfffe;
1038 musb_writew(regs, MUSB_INTRRXE, musb->intrrxe);
1039 musb_writeb(regs, MUSB_INTRUSBE, 0xf7);
1040
1041}
1042
1043static void musb_generic_disable(struct musb *musb)
1044{
1045 void __iomem *mbase = musb->mregs;
1046
1047 musb_disable_interrupts(musb);
1048
1049 /* off */
1050 musb_writeb(mbase, MUSB_DEVCTL, 0);
1051}
1052
1053/*
1054 * Program the HDRC to start (enable interrupts, dma, etc.).
1055 */
1056void musb_start(struct musb *musb)
1057{
1058 void __iomem *regs = musb->mregs;
1059 u8 devctl = musb_readb(regs, MUSB_DEVCTL);
1060 u8 power;
1061
1062 musb_dbg(musb, "<== devctl %02x", devctl);
1063
1064 musb_enable_interrupts(musb);
1065 musb_writeb(regs, MUSB_TESTMODE, 0);
1066
1067 power = MUSB_POWER_ISOUPDATE;
1068 /*
1069 * treating UNKNOWN as unspecified maximum speed, in which case
1070 * we will default to high-speed.
1071 */
1072 if (musb->config->maximum_speed == USB_SPEED_HIGH ||
1073 musb->config->maximum_speed == USB_SPEED_UNKNOWN)
1074 power |= MUSB_POWER_HSENAB;
1075 musb_writeb(regs, MUSB_POWER, power);
1076
1077 musb->is_active = 0;
1078 devctl = musb_readb(regs, MUSB_DEVCTL);
1079 devctl &= ~MUSB_DEVCTL_SESSION;
1080
1081 /* session started after:
1082 * (a) ID-grounded irq, host mode;
1083 * (b) vbus present/connect IRQ, peripheral mode;
1084 * (c) peripheral initiates, using SRP
1085 */
1086 if (musb->port_mode != MUSB_PORT_MODE_HOST &&
1087 musb->xceiv->otg->state != OTG_STATE_A_WAIT_BCON &&
1088 (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) {
1089 musb->is_active = 1;
1090 } else {
1091 devctl |= MUSB_DEVCTL_SESSION;
1092 }
1093
1094 musb_platform_enable(musb);
1095 musb_writeb(regs, MUSB_DEVCTL, devctl);
1096}
1097
1098/*
1099 * Make the HDRC stop (disable interrupts, etc.);
1100 * reversible by musb_start
1101 * called on gadget driver unregister
1102 * with controller locked, irqs blocked
1103 * acts as a NOP unless some role activated the hardware
1104 */
1105void musb_stop(struct musb *musb)
1106{
1107 /* stop IRQs, timers, ... */
1108 musb_platform_disable(musb);
1109 musb_generic_disable(musb);
1110 musb_dbg(musb, "HDRC disabled");
1111
1112 /* FIXME
1113 * - mark host and/or peripheral drivers unusable/inactive
1114 * - disable DMA (and enable it in HdrcStart)
1115 * - make sure we can musb_start() after musb_stop(); with
1116 * OTG mode, gadget driver module rmmod/modprobe cycles that
1117 * - ...
1118 */
1119 musb_platform_try_idle(musb, 0);
1120}
1121
1122/*-------------------------------------------------------------------------*/
1123
1124/*
1125 * The silicon either has hard-wired endpoint configurations, or else
1126 * "dynamic fifo" sizing. The driver has support for both, though at this
1127 * writing only the dynamic sizing is very well tested. Since we switched
1128 * away from compile-time hardware parameters, we can no longer rely on
1129 * dead code elimination to leave only the relevant one in the object file.
1130 *
1131 * We don't currently use dynamic fifo setup capability to do anything
1132 * more than selecting one of a bunch of predefined configurations.
1133 */
1134static ushort fifo_mode;
1135
1136/* "modprobe ... fifo_mode=1" etc */
1137module_param(fifo_mode, ushort, 0);
1138MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration");
1139
1140/*
1141 * tables defining fifo_mode values. define more if you like.
1142 * for host side, make sure both halves of ep1 are set up.
1143 */
1144
1145/* mode 0 - fits in 2KB */
1146static struct musb_fifo_cfg mode_0_cfg[] = {
1147{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1148{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1149{ .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, },
1150{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1151{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1152};
1153
1154/* mode 1 - fits in 4KB */
1155static struct musb_fifo_cfg mode_1_cfg[] = {
1156{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1157{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1158{ .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1159{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1160{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1161};
1162
1163/* mode 2 - fits in 4KB */
1164static struct musb_fifo_cfg mode_2_cfg[] = {
1165{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1166{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1167{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1168{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1169{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1170{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1171};
1172
1173/* mode 3 - fits in 4KB */
1174static struct musb_fifo_cfg mode_3_cfg[] = {
1175{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1176{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1177{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1178{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1179{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1180{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1181};
1182
1183/* mode 4 - fits in 16KB */
1184static struct musb_fifo_cfg mode_4_cfg[] = {
1185{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1186{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1187{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1188{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1189{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
1190{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
1191{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
1192{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
1193{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
1194{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
1195{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 512, },
1196{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 512, },
1197{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, },
1198{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 512, },
1199{ .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 512, },
1200{ .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 512, },
1201{ .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 512, },
1202{ .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 512, },
1203{ .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 256, },
1204{ .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 64, },
1205{ .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 256, },
1206{ .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 64, },
1207{ .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 256, },
1208{ .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 64, },
1209{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, },
1210{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1211{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1212};
1213
1214/* mode 5 - fits in 8KB */
1215static struct musb_fifo_cfg mode_5_cfg[] = {
1216{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1217{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1218{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1219{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1220{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
1221{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
1222{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
1223{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
1224{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
1225{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
1226{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 32, },
1227{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 32, },
1228{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 32, },
1229{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 32, },
1230{ .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 32, },
1231{ .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 32, },
1232{ .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 32, },
1233{ .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 32, },
1234{ .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 32, },
1235{ .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 32, },
1236{ .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 32, },
1237{ .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 32, },
1238{ .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 32, },
1239{ .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 32, },
1240{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, },
1241{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1242{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1243};
1244
1245/*
1246 * configure a fifo; for non-shared endpoints, this may be called
1247 * once for a tx fifo and once for an rx fifo.
1248 *
1249 * returns negative errno or offset for next fifo.
1250 */
1251static int
1252fifo_setup(struct musb *musb, struct musb_hw_ep *hw_ep,
1253 const struct musb_fifo_cfg *cfg, u16 offset)
1254{
1255 void __iomem *mbase = musb->mregs;
1256 int size = 0;
1257 u16 maxpacket = cfg->maxpacket;
1258 u16 c_off = offset >> 3;
1259 u8 c_size;
1260
1261 /* expect hw_ep has already been zero-initialized */
1262
1263 size = ffs(max(maxpacket, (u16) 8)) - 1;
1264 maxpacket = 1 << size;
1265
1266 c_size = size - 3;
1267 if (cfg->mode == BUF_DOUBLE) {
1268 if ((offset + (maxpacket << 1)) >
1269 (1 << (musb->config->ram_bits + 2)))
1270 return -EMSGSIZE;
1271 c_size |= MUSB_FIFOSZ_DPB;
1272 } else {
1273 if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2)))
1274 return -EMSGSIZE;
1275 }
1276
1277 /* configure the FIFO */
1278 musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum);
1279
1280 /* EP0 reserved endpoint for control, bidirectional;
1281 * EP1 reserved for bulk, two unidirectional halves.
1282 */
1283 if (hw_ep->epnum == 1)
1284 musb->bulk_ep = hw_ep;
1285 /* REVISIT error check: be sure ep0 can both rx and tx ... */
1286 switch (cfg->style) {
1287 case FIFO_TX:
1288 musb_write_txfifosz(mbase, c_size);
1289 musb_write_txfifoadd(mbase, c_off);
1290 hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1291 hw_ep->max_packet_sz_tx = maxpacket;
1292 break;
1293 case FIFO_RX:
1294 musb_write_rxfifosz(mbase, c_size);
1295 musb_write_rxfifoadd(mbase, c_off);
1296 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1297 hw_ep->max_packet_sz_rx = maxpacket;
1298 break;
1299 case FIFO_RXTX:
1300 musb_write_txfifosz(mbase, c_size);
1301 musb_write_txfifoadd(mbase, c_off);
1302 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1303 hw_ep->max_packet_sz_rx = maxpacket;
1304
1305 musb_write_rxfifosz(mbase, c_size);
1306 musb_write_rxfifoadd(mbase, c_off);
1307 hw_ep->tx_double_buffered = hw_ep->rx_double_buffered;
1308 hw_ep->max_packet_sz_tx = maxpacket;
1309
1310 hw_ep->is_shared_fifo = true;
1311 break;
1312 }
1313
1314 /* NOTE rx and tx endpoint irqs aren't managed separately,
1315 * which happens to be ok
1316 */
1317 musb->epmask |= (1 << hw_ep->epnum);
1318
1319 return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0));
1320}
1321
1322static struct musb_fifo_cfg ep0_cfg = {
1323 .style = FIFO_RXTX, .maxpacket = 64,
1324};
1325
1326static int ep_config_from_table(struct musb *musb)
1327{
1328 const struct musb_fifo_cfg *cfg;
1329 unsigned i, n;
1330 int offset;
1331 struct musb_hw_ep *hw_ep = musb->endpoints;
1332
1333 if (musb->config->fifo_cfg) {
1334 cfg = musb->config->fifo_cfg;
1335 n = musb->config->fifo_cfg_size;
1336 goto done;
1337 }
1338
1339 switch (fifo_mode) {
1340 default:
1341 fifo_mode = 0;
1342 /* FALLTHROUGH */
1343 case 0:
1344 cfg = mode_0_cfg;
1345 n = ARRAY_SIZE(mode_0_cfg);
1346 break;
1347 case 1:
1348 cfg = mode_1_cfg;
1349 n = ARRAY_SIZE(mode_1_cfg);
1350 break;
1351 case 2:
1352 cfg = mode_2_cfg;
1353 n = ARRAY_SIZE(mode_2_cfg);
1354 break;
1355 case 3:
1356 cfg = mode_3_cfg;
1357 n = ARRAY_SIZE(mode_3_cfg);
1358 break;
1359 case 4:
1360 cfg = mode_4_cfg;
1361 n = ARRAY_SIZE(mode_4_cfg);
1362 break;
1363 case 5:
1364 cfg = mode_5_cfg;
1365 n = ARRAY_SIZE(mode_5_cfg);
1366 break;
1367 }
1368
1369 pr_debug("%s: setup fifo_mode %d\n", musb_driver_name, fifo_mode);
1370
1371
1372done:
1373 offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0);
1374 /* assert(offset > 0) */
1375
1376 /* NOTE: for RTL versions >= 1.400 EPINFO and RAMINFO would
1377 * be better than static musb->config->num_eps and DYN_FIFO_SIZE...
1378 */
1379
1380 for (i = 0; i < n; i++) {
1381 u8 epn = cfg->hw_ep_num;
1382
1383 if (epn >= musb->config->num_eps) {
1384 pr_debug("%s: invalid ep %d\n",
1385 musb_driver_name, epn);
1386 return -EINVAL;
1387 }
1388 offset = fifo_setup(musb, hw_ep + epn, cfg++, offset);
1389 if (offset < 0) {
1390 pr_debug("%s: mem overrun, ep %d\n",
1391 musb_driver_name, epn);
1392 return offset;
1393 }
1394 epn++;
1395 musb->nr_endpoints = max(epn, musb->nr_endpoints);
1396 }
1397
1398 pr_debug("%s: %d/%d max ep, %d/%d memory\n",
1399 musb_driver_name,
1400 n + 1, musb->config->num_eps * 2 - 1,
1401 offset, (1 << (musb->config->ram_bits + 2)));
1402
1403 if (!musb->bulk_ep) {
1404 pr_debug("%s: missing bulk\n", musb_driver_name);
1405 return -EINVAL;
1406 }
1407
1408 return 0;
1409}
1410
1411
1412/*
1413 * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false
1414 * @param musb the controller
1415 */
1416static int ep_config_from_hw(struct musb *musb)
1417{
1418 u8 epnum = 0;
1419 struct musb_hw_ep *hw_ep;
1420 void __iomem *mbase = musb->mregs;
1421 int ret = 0;
1422
1423 musb_dbg(musb, "<== static silicon ep config");
1424
1425 /* FIXME pick up ep0 maxpacket size */
1426
1427 for (epnum = 1; epnum < musb->config->num_eps; epnum++) {
1428 musb_ep_select(mbase, epnum);
1429 hw_ep = musb->endpoints + epnum;
1430
1431 ret = musb_read_fifosize(musb, hw_ep, epnum);
1432 if (ret < 0)
1433 break;
1434
1435 /* FIXME set up hw_ep->{rx,tx}_double_buffered */
1436
1437 /* pick an RX/TX endpoint for bulk */
1438 if (hw_ep->max_packet_sz_tx < 512
1439 || hw_ep->max_packet_sz_rx < 512)
1440 continue;
1441
1442 /* REVISIT: this algorithm is lazy, we should at least
1443 * try to pick a double buffered endpoint.
1444 */
1445 if (musb->bulk_ep)
1446 continue;
1447 musb->bulk_ep = hw_ep;
1448 }
1449
1450 if (!musb->bulk_ep) {
1451 pr_debug("%s: missing bulk\n", musb_driver_name);
1452 return -EINVAL;
1453 }
1454
1455 return 0;
1456}
1457
1458enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, };
1459
1460/* Initialize MUSB (M)HDRC part of the USB hardware subsystem;
1461 * configure endpoints, or take their config from silicon
1462 */
1463static int musb_core_init(u16 musb_type, struct musb *musb)
1464{
1465 u8 reg;
1466 char *type;
1467 char aInfo[90];
1468 void __iomem *mbase = musb->mregs;
1469 int status = 0;
1470 int i;
1471
1472 /* log core options (read using indexed model) */
1473 reg = musb_read_configdata(mbase);
1474
1475 strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8");
1476 if (reg & MUSB_CONFIGDATA_DYNFIFO) {
1477 strcat(aInfo, ", dyn FIFOs");
1478 musb->dyn_fifo = true;
1479 }
1480 if (reg & MUSB_CONFIGDATA_MPRXE) {
1481 strcat(aInfo, ", bulk combine");
1482 musb->bulk_combine = true;
1483 }
1484 if (reg & MUSB_CONFIGDATA_MPTXE) {
1485 strcat(aInfo, ", bulk split");
1486 musb->bulk_split = true;
1487 }
1488 if (reg & MUSB_CONFIGDATA_HBRXE) {
1489 strcat(aInfo, ", HB-ISO Rx");
1490 musb->hb_iso_rx = true;
1491 }
1492 if (reg & MUSB_CONFIGDATA_HBTXE) {
1493 strcat(aInfo, ", HB-ISO Tx");
1494 musb->hb_iso_tx = true;
1495 }
1496 if (reg & MUSB_CONFIGDATA_SOFTCONE)
1497 strcat(aInfo, ", SoftConn");
1498
1499 pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo);
1500
1501 if (MUSB_CONTROLLER_MHDRC == musb_type) {
1502 musb->is_multipoint = 1;
1503 type = "M";
1504 } else {
1505 musb->is_multipoint = 0;
1506 type = "";
1507#ifndef CONFIG_USB_OTG_BLACKLIST_HUB
1508 pr_err("%s: kernel must blacklist external hubs\n",
1509 musb_driver_name);
1510#endif
1511 }
1512
1513 /* log release info */
1514 musb->hwvers = musb_read_hwvers(mbase);
1515 pr_debug("%s: %sHDRC RTL version %d.%d%s\n",
1516 musb_driver_name, type, MUSB_HWVERS_MAJOR(musb->hwvers),
1517 MUSB_HWVERS_MINOR(musb->hwvers),
1518 (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
1519
1520 /* configure ep0 */
1521 musb_configure_ep0(musb);
1522
1523 /* discover endpoint configuration */
1524 musb->nr_endpoints = 1;
1525 musb->epmask = 1;
1526
1527 if (musb->dyn_fifo)
1528 status = ep_config_from_table(musb);
1529 else
1530 status = ep_config_from_hw(musb);
1531
1532 if (status < 0)
1533 return status;
1534
1535 /* finish init, and print endpoint config */
1536 for (i = 0; i < musb->nr_endpoints; i++) {
1537 struct musb_hw_ep *hw_ep = musb->endpoints + i;
1538
1539 hw_ep->fifo = musb->io.fifo_offset(i) + mbase;
1540#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
1541 if (musb->io.quirks & MUSB_IN_TUSB) {
1542 hw_ep->fifo_async = musb->async + 0x400 +
1543 musb->io.fifo_offset(i);
1544 hw_ep->fifo_sync = musb->sync + 0x400 +
1545 musb->io.fifo_offset(i);
1546 hw_ep->fifo_sync_va =
1547 musb->sync_va + 0x400 + musb->io.fifo_offset(i);
1548
1549 if (i == 0)
1550 hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF;
1551 else
1552 hw_ep->conf = mbase + 0x400 +
1553 (((i - 1) & 0xf) << 2);
1554 }
1555#endif
1556
1557 hw_ep->regs = musb->io.ep_offset(i, 0) + mbase;
1558 hw_ep->rx_reinit = 1;
1559 hw_ep->tx_reinit = 1;
1560
1561 if (hw_ep->max_packet_sz_tx) {
1562 musb_dbg(musb, "%s: hw_ep %d%s, %smax %d",
1563 musb_driver_name, i,
1564 hw_ep->is_shared_fifo ? "shared" : "tx",
1565 hw_ep->tx_double_buffered
1566 ? "doublebuffer, " : "",
1567 hw_ep->max_packet_sz_tx);
1568 }
1569 if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) {
1570 musb_dbg(musb, "%s: hw_ep %d%s, %smax %d",
1571 musb_driver_name, i,
1572 "rx",
1573 hw_ep->rx_double_buffered
1574 ? "doublebuffer, " : "",
1575 hw_ep->max_packet_sz_rx);
1576 }
1577 if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx))
1578 musb_dbg(musb, "hw_ep %d not configured", i);
1579 }
1580
1581 return 0;
1582}
1583
1584/*-------------------------------------------------------------------------*/
1585
1586/*
1587 * handle all the irqs defined by the HDRC core. for now we expect: other
1588 * irq sources (phy, dma, etc) will be handled first, musb->int_* values
1589 * will be assigned, and the irq will already have been acked.
1590 *
1591 * called in irq context with spinlock held, irqs blocked
1592 */
1593irqreturn_t musb_interrupt(struct musb *musb)
1594{
1595 irqreturn_t retval = IRQ_NONE;
1596 unsigned long status;
1597 unsigned long epnum;
1598 u8 devctl;
1599
1600 if (!musb->int_usb && !musb->int_tx && !musb->int_rx)
1601 return IRQ_NONE;
1602
1603 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1604
1605 trace_musb_isr(musb);
1606
1607 /**
1608 * According to Mentor Graphics' documentation, flowchart on page 98,
1609 * IRQ should be handled as follows:
1610 *
1611 * . Resume IRQ
1612 * . Session Request IRQ
1613 * . VBUS Error IRQ
1614 * . Suspend IRQ
1615 * . Connect IRQ
1616 * . Disconnect IRQ
1617 * . Reset/Babble IRQ
1618 * . SOF IRQ (we're not using this one)
1619 * . Endpoint 0 IRQ
1620 * . TX Endpoints
1621 * . RX Endpoints
1622 *
1623 * We will be following that flowchart in order to avoid any problems
1624 * that might arise with internal Finite State Machine.
1625 */
1626
1627 if (musb->int_usb)
1628 retval |= musb_stage0_irq(musb, musb->int_usb, devctl);
1629
1630 if (musb->int_tx & 1) {
1631 if (is_host_active(musb))
1632 retval |= musb_h_ep0_irq(musb);
1633 else
1634 retval |= musb_g_ep0_irq(musb);
1635
1636 /* we have just handled endpoint 0 IRQ, clear it */
1637 musb->int_tx &= ~BIT(0);
1638 }
1639
1640 status = musb->int_tx;
1641
1642 for_each_set_bit(epnum, &status, 16) {
1643 retval = IRQ_HANDLED;
1644 if (is_host_active(musb))
1645 musb_host_tx(musb, epnum);
1646 else
1647 musb_g_tx(musb, epnum);
1648 }
1649
1650 status = musb->int_rx;
1651
1652 for_each_set_bit(epnum, &status, 16) {
1653 retval = IRQ_HANDLED;
1654 if (is_host_active(musb))
1655 musb_host_rx(musb, epnum);
1656 else
1657 musb_g_rx(musb, epnum);
1658 }
1659
1660 return retval;
1661}
1662EXPORT_SYMBOL_GPL(musb_interrupt);
1663
1664#ifndef CONFIG_MUSB_PIO_ONLY
1665static bool use_dma = 1;
1666
1667/* "modprobe ... use_dma=0" etc */
1668module_param(use_dma, bool, 0644);
1669MODULE_PARM_DESC(use_dma, "enable/disable use of DMA");
1670
1671void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit)
1672{
1673 /* called with controller lock already held */
1674
1675 if (!epnum) {
1676 if (!is_cppi_enabled(musb)) {
1677 /* endpoint 0 */
1678 if (is_host_active(musb))
1679 musb_h_ep0_irq(musb);
1680 else
1681 musb_g_ep0_irq(musb);
1682 }
1683 } else {
1684 /* endpoints 1..15 */
1685 if (transmit) {
1686 if (is_host_active(musb))
1687 musb_host_tx(musb, epnum);
1688 else
1689 musb_g_tx(musb, epnum);
1690 } else {
1691 /* receive */
1692 if (is_host_active(musb))
1693 musb_host_rx(musb, epnum);
1694 else
1695 musb_g_rx(musb, epnum);
1696 }
1697 }
1698}
1699EXPORT_SYMBOL_GPL(musb_dma_completion);
1700
1701#else
1702#define use_dma 0
1703#endif
1704
1705static int (*musb_phy_callback)(enum musb_vbus_id_status status);
1706
1707/*
1708 * musb_mailbox - optional phy notifier function
1709 * @status phy state change
1710 *
1711 * Optionally gets called from the USB PHY. Note that the USB PHY must be
1712 * disabled at the point the phy_callback is registered or unregistered.
1713 */
1714int musb_mailbox(enum musb_vbus_id_status status)
1715{
1716 if (musb_phy_callback)
1717 return musb_phy_callback(status);
1718
1719 return -ENODEV;
1720};
1721EXPORT_SYMBOL_GPL(musb_mailbox);
1722
1723/*-------------------------------------------------------------------------*/
1724
1725static ssize_t
1726musb_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
1727{
1728 struct musb *musb = dev_to_musb(dev);
1729 unsigned long flags;
1730 int ret = -EINVAL;
1731
1732 spin_lock_irqsave(&musb->lock, flags);
1733 ret = sprintf(buf, "%s\n", usb_otg_state_string(musb->xceiv->otg->state));
1734 spin_unlock_irqrestore(&musb->lock, flags);
1735
1736 return ret;
1737}
1738
1739static ssize_t
1740musb_mode_store(struct device *dev, struct device_attribute *attr,
1741 const char *buf, size_t n)
1742{
1743 struct musb *musb = dev_to_musb(dev);
1744 unsigned long flags;
1745 int status;
1746
1747 spin_lock_irqsave(&musb->lock, flags);
1748 if (sysfs_streq(buf, "host"))
1749 status = musb_platform_set_mode(musb, MUSB_HOST);
1750 else if (sysfs_streq(buf, "peripheral"))
1751 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
1752 else if (sysfs_streq(buf, "otg"))
1753 status = musb_platform_set_mode(musb, MUSB_OTG);
1754 else
1755 status = -EINVAL;
1756 spin_unlock_irqrestore(&musb->lock, flags);
1757
1758 return (status == 0) ? n : status;
1759}
1760static DEVICE_ATTR(mode, 0644, musb_mode_show, musb_mode_store);
1761
1762static ssize_t
1763musb_vbus_store(struct device *dev, struct device_attribute *attr,
1764 const char *buf, size_t n)
1765{
1766 struct musb *musb = dev_to_musb(dev);
1767 unsigned long flags;
1768 unsigned long val;
1769
1770 if (sscanf(buf, "%lu", &val) < 1) {
1771 dev_err(dev, "Invalid VBUS timeout ms value\n");
1772 return -EINVAL;
1773 }
1774
1775 spin_lock_irqsave(&musb->lock, flags);
1776 /* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
1777 musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
1778 if (musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)
1779 musb->is_active = 0;
1780 musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
1781 spin_unlock_irqrestore(&musb->lock, flags);
1782
1783 return n;
1784}
1785
1786static ssize_t
1787musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
1788{
1789 struct musb *musb = dev_to_musb(dev);
1790 unsigned long flags;
1791 unsigned long val;
1792 int vbus;
1793 u8 devctl;
1794
1795 spin_lock_irqsave(&musb->lock, flags);
1796 val = musb->a_wait_bcon;
1797 vbus = musb_platform_get_vbus_status(musb);
1798 if (vbus < 0) {
1799 /* Use default MUSB method by means of DEVCTL register */
1800 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1801 if ((devctl & MUSB_DEVCTL_VBUS)
1802 == (3 << MUSB_DEVCTL_VBUS_SHIFT))
1803 vbus = 1;
1804 else
1805 vbus = 0;
1806 }
1807 spin_unlock_irqrestore(&musb->lock, flags);
1808
1809 return sprintf(buf, "Vbus %s, timeout %lu msec\n",
1810 vbus ? "on" : "off", val);
1811}
1812static DEVICE_ATTR(vbus, 0644, musb_vbus_show, musb_vbus_store);
1813
1814/* Gadget drivers can't know that a host is connected so they might want
1815 * to start SRP, but users can. This allows userspace to trigger SRP.
1816 */
1817static ssize_t
1818musb_srp_store(struct device *dev, struct device_attribute *attr,
1819 const char *buf, size_t n)
1820{
1821 struct musb *musb = dev_to_musb(dev);
1822 unsigned short srp;
1823
1824 if (sscanf(buf, "%hu", &srp) != 1
1825 || (srp != 1)) {
1826 dev_err(dev, "SRP: Value must be 1\n");
1827 return -EINVAL;
1828 }
1829
1830 if (srp == 1)
1831 musb_g_wakeup(musb);
1832
1833 return n;
1834}
1835static DEVICE_ATTR(srp, 0644, NULL, musb_srp_store);
1836
1837static struct attribute *musb_attributes[] = {
1838 &dev_attr_mode.attr,
1839 &dev_attr_vbus.attr,
1840 &dev_attr_srp.attr,
1841 NULL
1842};
1843
1844static const struct attribute_group musb_attr_group = {
1845 .attrs = musb_attributes,
1846};
1847
1848#define MUSB_QUIRK_B_INVALID_VBUS_91 (MUSB_DEVCTL_BDEVICE | \
1849 (2 << MUSB_DEVCTL_VBUS_SHIFT) | \
1850 MUSB_DEVCTL_SESSION)
1851#define MUSB_QUIRK_A_DISCONNECT_19 ((3 << MUSB_DEVCTL_VBUS_SHIFT) | \
1852 MUSB_DEVCTL_SESSION)
1853
1854/*
1855 * Check the musb devctl session bit to determine if we want to
1856 * allow PM runtime for the device. In general, we want to keep things
1857 * active when the session bit is set except after host disconnect.
1858 *
1859 * Only called from musb_irq_work. If this ever needs to get called
1860 * elsewhere, proper locking must be implemented for musb->session.
1861 */
1862static void musb_pm_runtime_check_session(struct musb *musb)
1863{
1864 u8 devctl, s;
1865 int error;
1866
1867 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1868
1869 /* Handle session status quirks first */
1870 s = MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV |
1871 MUSB_DEVCTL_HR;
1872 switch (devctl & ~s) {
1873 case MUSB_QUIRK_B_INVALID_VBUS_91:
1874 if (musb->quirk_retries--) {
1875 musb_dbg(musb,
1876 "Poll devctl on invalid vbus, assume no session");
1877 schedule_delayed_work(&musb->irq_work,
1878 msecs_to_jiffies(1000));
1879
1880 return;
1881 }
1882 case MUSB_QUIRK_A_DISCONNECT_19:
1883 if (musb->quirk_retries--) {
1884 musb_dbg(musb,
1885 "Poll devctl on possible host mode disconnect");
1886 schedule_delayed_work(&musb->irq_work,
1887 msecs_to_jiffies(1000));
1888
1889 return;
1890 }
1891 if (!musb->session)
1892 break;
1893 musb_dbg(musb, "Allow PM on possible host mode disconnect");
1894 pm_runtime_mark_last_busy(musb->controller);
1895 pm_runtime_put_autosuspend(musb->controller);
1896 musb->session = false;
1897 return;
1898 default:
1899 break;
1900 }
1901
1902 /* No need to do anything if session has not changed */
1903 s = devctl & MUSB_DEVCTL_SESSION;
1904 if (s == musb->session)
1905 return;
1906
1907 /* Block PM or allow PM? */
1908 if (s) {
1909 musb_dbg(musb, "Block PM on active session: %02x", devctl);
1910 error = pm_runtime_get_sync(musb->controller);
1911 if (error < 0)
1912 dev_err(musb->controller, "Could not enable: %i\n",
1913 error);
1914 musb->quirk_retries = 3;
1915 } else {
1916 musb_dbg(musb, "Allow PM with no session: %02x", devctl);
1917 pm_runtime_mark_last_busy(musb->controller);
1918 pm_runtime_put_autosuspend(musb->controller);
1919 }
1920
1921 musb->session = s;
1922}
1923
1924/* Only used to provide driver mode change events */
1925static void musb_irq_work(struct work_struct *data)
1926{
1927 struct musb *musb = container_of(data, struct musb, irq_work.work);
1928 int error;
1929
1930 error = pm_runtime_get_sync(musb->controller);
1931 if (error < 0) {
1932 dev_err(musb->controller, "Could not enable: %i\n", error);
1933
1934 return;
1935 }
1936
1937 musb_pm_runtime_check_session(musb);
1938
1939 if (musb->xceiv->otg->state != musb->xceiv_old_state) {
1940 musb->xceiv_old_state = musb->xceiv->otg->state;
1941 sysfs_notify(&musb->controller->kobj, NULL, "mode");
1942 }
1943
1944 pm_runtime_mark_last_busy(musb->controller);
1945 pm_runtime_put_autosuspend(musb->controller);
1946}
1947
1948static void musb_recover_from_babble(struct musb *musb)
1949{
1950 int ret;
1951 u8 devctl;
1952
1953 musb_disable_interrupts(musb);
1954
1955 /*
1956 * wait at least 320 cycles of 60MHz clock. That's 5.3us, we will give
1957 * it some slack and wait for 10us.
1958 */
1959 udelay(10);
1960
1961 ret = musb_platform_recover(musb);
1962 if (ret) {
1963 musb_enable_interrupts(musb);
1964 return;
1965 }
1966
1967 /* drop session bit */
1968 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1969 devctl &= ~MUSB_DEVCTL_SESSION;
1970 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
1971
1972 /* tell usbcore about it */
1973 musb_root_disconnect(musb);
1974
1975 /*
1976 * When a babble condition occurs, the musb controller
1977 * removes the session bit and the endpoint config is lost.
1978 */
1979 if (musb->dyn_fifo)
1980 ret = ep_config_from_table(musb);
1981 else
1982 ret = ep_config_from_hw(musb);
1983
1984 /* restart session */
1985 if (ret == 0)
1986 musb_start(musb);
1987}
1988
1989/* --------------------------------------------------------------------------
1990 * Init support
1991 */
1992
1993static struct musb *allocate_instance(struct device *dev,
1994 const struct musb_hdrc_config *config, void __iomem *mbase)
1995{
1996 struct musb *musb;
1997 struct musb_hw_ep *ep;
1998 int epnum;
1999 int ret;
2000
2001 musb = devm_kzalloc(dev, sizeof(*musb), GFP_KERNEL);
2002 if (!musb)
2003 return NULL;
2004
2005 INIT_LIST_HEAD(&musb->control);
2006 INIT_LIST_HEAD(&musb->in_bulk);
2007 INIT_LIST_HEAD(&musb->out_bulk);
2008 INIT_LIST_HEAD(&musb->pending_list);
2009
2010 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
2011 musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON;
2012 musb->mregs = mbase;
2013 musb->ctrl_base = mbase;
2014 musb->nIrq = -ENODEV;
2015 musb->config = config;
2016 BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS);
2017 for (epnum = 0, ep = musb->endpoints;
2018 epnum < musb->config->num_eps;
2019 epnum++, ep++) {
2020 ep->musb = musb;
2021 ep->epnum = epnum;
2022 }
2023
2024 musb->controller = dev;
2025
2026 ret = musb_host_alloc(musb);
2027 if (ret < 0)
2028 goto err_free;
2029
2030 dev_set_drvdata(dev, musb);
2031
2032 return musb;
2033
2034err_free:
2035 return NULL;
2036}
2037
2038static void musb_free(struct musb *musb)
2039{
2040 /* this has multiple entry modes. it handles fault cleanup after
2041 * probe(), where things may be partially set up, as well as rmmod
2042 * cleanup after everything's been de-activated.
2043 */
2044
2045#ifdef CONFIG_SYSFS
2046 sysfs_remove_group(&musb->controller->kobj, &musb_attr_group);
2047#endif
2048
2049 if (musb->nIrq >= 0) {
2050 if (musb->irq_wake)
2051 disable_irq_wake(musb->nIrq);
2052 free_irq(musb->nIrq, musb);
2053 }
2054
2055 musb_host_free(musb);
2056}
2057
2058struct musb_pending_work {
2059 int (*callback)(struct musb *musb, void *data);
2060 void *data;
2061 struct list_head node;
2062};
2063
2064#ifdef CONFIG_PM
2065/*
2066 * Called from musb_runtime_resume(), musb_resume(), and
2067 * musb_queue_resume_work(). Callers must take musb->lock.
2068 */
2069static int musb_run_resume_work(struct musb *musb)
2070{
2071 struct musb_pending_work *w, *_w;
2072 unsigned long flags;
2073 int error = 0;
2074
2075 spin_lock_irqsave(&musb->list_lock, flags);
2076 list_for_each_entry_safe(w, _w, &musb->pending_list, node) {
2077 if (w->callback) {
2078 error = w->callback(musb, w->data);
2079 if (error < 0) {
2080 dev_err(musb->controller,
2081 "resume callback %p failed: %i\n",
2082 w->callback, error);
2083 }
2084 }
2085 list_del(&w->node);
2086 devm_kfree(musb->controller, w);
2087 }
2088 spin_unlock_irqrestore(&musb->list_lock, flags);
2089
2090 return error;
2091}
2092#endif
2093
2094/*
2095 * Called to run work if device is active or else queue the work to happen
2096 * on resume. Caller must take musb->lock and must hold an RPM reference.
2097 *
2098 * Note that we cowardly refuse queuing work after musb PM runtime
2099 * resume is done calling musb_run_resume_work() and return -EINPROGRESS
2100 * instead.
2101 */
2102int musb_queue_resume_work(struct musb *musb,
2103 int (*callback)(struct musb *musb, void *data),
2104 void *data)
2105{
2106 struct musb_pending_work *w;
2107 unsigned long flags;
2108 int error;
2109
2110 if (WARN_ON(!callback))
2111 return -EINVAL;
2112
2113 if (pm_runtime_active(musb->controller))
2114 return callback(musb, data);
2115
2116 w = devm_kzalloc(musb->controller, sizeof(*w), GFP_ATOMIC);
2117 if (!w)
2118 return -ENOMEM;
2119
2120 w->callback = callback;
2121 w->data = data;
2122 spin_lock_irqsave(&musb->list_lock, flags);
2123 if (musb->is_runtime_suspended) {
2124 list_add_tail(&w->node, &musb->pending_list);
2125 error = 0;
2126 } else {
2127 dev_err(musb->controller, "could not add resume work %p\n",
2128 callback);
2129 devm_kfree(musb->controller, w);
2130 error = -EINPROGRESS;
2131 }
2132 spin_unlock_irqrestore(&musb->list_lock, flags);
2133
2134 return error;
2135}
2136EXPORT_SYMBOL_GPL(musb_queue_resume_work);
2137
2138static void musb_deassert_reset(struct work_struct *work)
2139{
2140 struct musb *musb;
2141 unsigned long flags;
2142
2143 musb = container_of(work, struct musb, deassert_reset_work.work);
2144
2145 spin_lock_irqsave(&musb->lock, flags);
2146
2147 if (musb->port1_status & USB_PORT_STAT_RESET)
2148 musb_port_reset(musb, false);
2149
2150 spin_unlock_irqrestore(&musb->lock, flags);
2151}
2152
2153/*
2154 * Perform generic per-controller initialization.
2155 *
2156 * @dev: the controller (already clocked, etc)
2157 * @nIrq: IRQ number
2158 * @ctrl: virtual address of controller registers,
2159 * not yet corrected for platform-specific offsets
2160 */
2161static int
2162musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
2163{
2164 int status;
2165 struct musb *musb;
2166 struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
2167
2168 /* The driver might handle more features than the board; OK.
2169 * Fail when the board needs a feature that's not enabled.
2170 */
2171 if (!plat) {
2172 dev_err(dev, "no platform_data?\n");
2173 status = -ENODEV;
2174 goto fail0;
2175 }
2176
2177 /* allocate */
2178 musb = allocate_instance(dev, plat->config, ctrl);
2179 if (!musb) {
2180 status = -ENOMEM;
2181 goto fail0;
2182 }
2183
2184 spin_lock_init(&musb->lock);
2185 spin_lock_init(&musb->list_lock);
2186 musb->board_set_power = plat->set_power;
2187 musb->min_power = plat->min_power;
2188 musb->ops = plat->platform_ops;
2189 musb->port_mode = plat->mode;
2190
2191 /*
2192 * Initialize the default IO functions. At least omap2430 needs
2193 * these early. We initialize the platform specific IO functions
2194 * later on.
2195 */
2196 musb_readb = musb_default_readb;
2197 musb_writeb = musb_default_writeb;
2198 musb_readw = musb_default_readw;
2199 musb_writew = musb_default_writew;
2200 musb_readl = musb_default_readl;
2201 musb_writel = musb_default_writel;
2202
2203 /* The musb_platform_init() call:
2204 * - adjusts musb->mregs
2205 * - sets the musb->isr
2206 * - may initialize an integrated transceiver
2207 * - initializes musb->xceiv, usually by otg_get_phy()
2208 * - stops powering VBUS
2209 *
2210 * There are various transceiver configurations. Blackfin,
2211 * DaVinci, TUSB60x0, and others integrate them. OMAP3 uses
2212 * external/discrete ones in various flavors (twl4030 family,
2213 * isp1504, non-OTG, etc) mostly hooking up through ULPI.
2214 */
2215 status = musb_platform_init(musb);
2216 if (status < 0)
2217 goto fail1;
2218
2219 if (!musb->isr) {
2220 status = -ENODEV;
2221 goto fail2;
2222 }
2223
2224 if (musb->ops->quirks)
2225 musb->io.quirks = musb->ops->quirks;
2226
2227 /* Most devices use indexed offset or flat offset */
2228 if (musb->io.quirks & MUSB_INDEXED_EP) {
2229 musb->io.ep_offset = musb_indexed_ep_offset;
2230 musb->io.ep_select = musb_indexed_ep_select;
2231 } else {
2232 musb->io.ep_offset = musb_flat_ep_offset;
2233 musb->io.ep_select = musb_flat_ep_select;
2234 }
2235
2236 /* At least tusb6010 has its own offsets */
2237 if (musb->ops->ep_offset)
2238 musb->io.ep_offset = musb->ops->ep_offset;
2239 if (musb->ops->ep_select)
2240 musb->io.ep_select = musb->ops->ep_select;
2241
2242 if (musb->ops->fifo_mode)
2243 fifo_mode = musb->ops->fifo_mode;
2244 else
2245 fifo_mode = 4;
2246
2247 if (musb->ops->fifo_offset)
2248 musb->io.fifo_offset = musb->ops->fifo_offset;
2249 else
2250 musb->io.fifo_offset = musb_default_fifo_offset;
2251
2252 if (musb->ops->busctl_offset)
2253 musb->io.busctl_offset = musb->ops->busctl_offset;
2254 else
2255 musb->io.busctl_offset = musb_default_busctl_offset;
2256
2257 if (musb->ops->readb)
2258 musb_readb = musb->ops->readb;
2259 if (musb->ops->writeb)
2260 musb_writeb = musb->ops->writeb;
2261 if (musb->ops->readw)
2262 musb_readw = musb->ops->readw;
2263 if (musb->ops->writew)
2264 musb_writew = musb->ops->writew;
2265 if (musb->ops->readl)
2266 musb_readl = musb->ops->readl;
2267 if (musb->ops->writel)
2268 musb_writel = musb->ops->writel;
2269
2270#ifndef CONFIG_MUSB_PIO_ONLY
2271 if (!musb->ops->dma_init || !musb->ops->dma_exit) {
2272 dev_err(dev, "DMA controller not set\n");
2273 status = -ENODEV;
2274 goto fail2;
2275 }
2276 musb_dma_controller_create = musb->ops->dma_init;
2277 musb_dma_controller_destroy = musb->ops->dma_exit;
2278#endif
2279
2280 if (musb->ops->read_fifo)
2281 musb->io.read_fifo = musb->ops->read_fifo;
2282 else
2283 musb->io.read_fifo = musb_default_read_fifo;
2284
2285 if (musb->ops->write_fifo)
2286 musb->io.write_fifo = musb->ops->write_fifo;
2287 else
2288 musb->io.write_fifo = musb_default_write_fifo;
2289
2290 if (!musb->xceiv->io_ops) {
2291 musb->xceiv->io_dev = musb->controller;
2292 musb->xceiv->io_priv = musb->mregs;
2293 musb->xceiv->io_ops = &musb_ulpi_access;
2294 }
2295
2296 if (musb->ops->phy_callback)
2297 musb_phy_callback = musb->ops->phy_callback;
2298
2299 /*
2300 * We need musb_read/write functions initialized for PM.
2301 * Note that at least 2430 glue needs autosuspend delay
2302 * somewhere above 300 ms for the hardware to idle properly
2303 * after disconnecting the cable in host mode. Let's use
2304 * 500 ms for some margin.
2305 */
2306 pm_runtime_use_autosuspend(musb->controller);
2307 pm_runtime_set_autosuspend_delay(musb->controller, 500);
2308 pm_runtime_enable(musb->controller);
2309 pm_runtime_get_sync(musb->controller);
2310
2311 status = usb_phy_init(musb->xceiv);
2312 if (status < 0)
2313 goto err_usb_phy_init;
2314
2315 if (use_dma && dev->dma_mask) {
2316 musb->dma_controller =
2317 musb_dma_controller_create(musb, musb->mregs);
2318 if (IS_ERR(musb->dma_controller)) {
2319 status = PTR_ERR(musb->dma_controller);
2320 goto fail2_5;
2321 }
2322 }
2323
2324 /* be sure interrupts are disabled before connecting ISR */
2325 musb_platform_disable(musb);
2326 musb_generic_disable(musb);
2327
2328 /* Init IRQ workqueue before request_irq */
2329 INIT_DELAYED_WORK(&musb->irq_work, musb_irq_work);
2330 INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
2331 INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume);
2332
2333 /* setup musb parts of the core (especially endpoints) */
2334 status = musb_core_init(plat->config->multipoint
2335 ? MUSB_CONTROLLER_MHDRC
2336 : MUSB_CONTROLLER_HDRC, musb);
2337 if (status < 0)
2338 goto fail3;
2339
2340 setup_timer(&musb->otg_timer, musb_otg_timer_func, (unsigned long) musb);
2341
2342 /* attach to the IRQ */
2343 if (request_irq(nIrq, musb->isr, 0, dev_name(dev), musb)) {
2344 dev_err(dev, "request_irq %d failed!\n", nIrq);
2345 status = -ENODEV;
2346 goto fail3;
2347 }
2348 musb->nIrq = nIrq;
2349 /* FIXME this handles wakeup irqs wrong */
2350 if (enable_irq_wake(nIrq) == 0) {
2351 musb->irq_wake = 1;
2352 device_init_wakeup(dev, 1);
2353 } else {
2354 musb->irq_wake = 0;
2355 }
2356
2357 /* program PHY to use external vBus if required */
2358 if (plat->extvbus) {
2359 u8 busctl = musb_read_ulpi_buscontrol(musb->mregs);
2360 busctl |= MUSB_ULPI_USE_EXTVBUS;
2361 musb_write_ulpi_buscontrol(musb->mregs, busctl);
2362 }
2363
2364 if (musb->xceiv->otg->default_a) {
2365 MUSB_HST_MODE(musb);
2366 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
2367 } else {
2368 MUSB_DEV_MODE(musb);
2369 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
2370 }
2371
2372 switch (musb->port_mode) {
2373 case MUSB_PORT_MODE_HOST:
2374 status = musb_host_setup(musb, plat->power);
2375 if (status < 0)
2376 goto fail3;
2377 status = musb_platform_set_mode(musb, MUSB_HOST);
2378 break;
2379 case MUSB_PORT_MODE_GADGET:
2380 status = musb_gadget_setup(musb);
2381 if (status < 0)
2382 goto fail3;
2383 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
2384 break;
2385 case MUSB_PORT_MODE_DUAL_ROLE:
2386 status = musb_host_setup(musb, plat->power);
2387 if (status < 0)
2388 goto fail3;
2389 status = musb_gadget_setup(musb);
2390 if (status) {
2391 musb_host_cleanup(musb);
2392 goto fail3;
2393 }
2394 status = musb_platform_set_mode(musb, MUSB_OTG);
2395 break;
2396 default:
2397 dev_err(dev, "unsupported port mode %d\n", musb->port_mode);
2398 break;
2399 }
2400
2401 if (status < 0)
2402 goto fail3;
2403
2404 status = musb_init_debugfs(musb);
2405 if (status < 0)
2406 goto fail4;
2407
2408 status = sysfs_create_group(&musb->controller->kobj, &musb_attr_group);
2409 if (status)
2410 goto fail5;
2411
2412 musb->is_initialized = 1;
2413 pm_runtime_mark_last_busy(musb->controller);
2414 pm_runtime_put_autosuspend(musb->controller);
2415
2416 return 0;
2417
2418fail5:
2419 musb_exit_debugfs(musb);
2420
2421fail4:
2422 musb_gadget_cleanup(musb);
2423 musb_host_cleanup(musb);
2424
2425fail3:
2426 cancel_delayed_work_sync(&musb->irq_work);
2427 cancel_delayed_work_sync(&musb->finish_resume_work);
2428 cancel_delayed_work_sync(&musb->deassert_reset_work);
2429 if (musb->dma_controller)
2430 musb_dma_controller_destroy(musb->dma_controller);
2431
2432fail2_5:
2433 usb_phy_shutdown(musb->xceiv);
2434
2435err_usb_phy_init:
2436 pm_runtime_dont_use_autosuspend(musb->controller);
2437 pm_runtime_put_sync(musb->controller);
2438 pm_runtime_disable(musb->controller);
2439
2440fail2:
2441 if (musb->irq_wake)
2442 device_init_wakeup(dev, 0);
2443 musb_platform_exit(musb);
2444
2445fail1:
2446 if (status != -EPROBE_DEFER)
2447 dev_err(musb->controller,
2448 "%s failed with status %d\n", __func__, status);
2449
2450 musb_free(musb);
2451
2452fail0:
2453
2454 return status;
2455
2456}
2457
2458/*-------------------------------------------------------------------------*/
2459
2460/* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just
2461 * bridge to a platform device; this driver then suffices.
2462 */
2463static int musb_probe(struct platform_device *pdev)
2464{
2465 struct device *dev = &pdev->dev;
2466 int irq = platform_get_irq_byname(pdev, "mc");
2467 struct resource *iomem;
2468 void __iomem *base;
2469
2470 if (irq <= 0)
2471 return -ENODEV;
2472
2473 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2474 base = devm_ioremap_resource(dev, iomem);
2475 if (IS_ERR(base))
2476 return PTR_ERR(base);
2477
2478 return musb_init_controller(dev, irq, base);
2479}
2480
2481static int musb_remove(struct platform_device *pdev)
2482{
2483 struct device *dev = &pdev->dev;
2484 struct musb *musb = dev_to_musb(dev);
2485 unsigned long flags;
2486
2487 /* this gets called on rmmod.
2488 * - Host mode: host may still be active
2489 * - Peripheral mode: peripheral is deactivated (or never-activated)
2490 * - OTG mode: both roles are deactivated (or never-activated)
2491 */
2492 musb_exit_debugfs(musb);
2493
2494 cancel_delayed_work_sync(&musb->irq_work);
2495 cancel_delayed_work_sync(&musb->finish_resume_work);
2496 cancel_delayed_work_sync(&musb->deassert_reset_work);
2497 pm_runtime_get_sync(musb->controller);
2498 musb_host_cleanup(musb);
2499 musb_gadget_cleanup(musb);
2500 musb_platform_disable(musb);
2501 spin_lock_irqsave(&musb->lock, flags);
2502 musb_generic_disable(musb);
2503 spin_unlock_irqrestore(&musb->lock, flags);
2504 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
2505 pm_runtime_dont_use_autosuspend(musb->controller);
2506 pm_runtime_put_sync(musb->controller);
2507 pm_runtime_disable(musb->controller);
2508 musb_platform_exit(musb);
2509 musb_phy_callback = NULL;
2510 if (musb->dma_controller)
2511 musb_dma_controller_destroy(musb->dma_controller);
2512 usb_phy_shutdown(musb->xceiv);
2513 musb_free(musb);
2514 device_init_wakeup(dev, 0);
2515 return 0;
2516}
2517
2518#ifdef CONFIG_PM
2519
2520static void musb_save_context(struct musb *musb)
2521{
2522 int i;
2523 void __iomem *musb_base = musb->mregs;
2524 void __iomem *epio;
2525
2526 musb->context.frame = musb_readw(musb_base, MUSB_FRAME);
2527 musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE);
2528 musb->context.busctl = musb_read_ulpi_buscontrol(musb->mregs);
2529 musb->context.power = musb_readb(musb_base, MUSB_POWER);
2530 musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE);
2531 musb->context.index = musb_readb(musb_base, MUSB_INDEX);
2532 musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL);
2533
2534 for (i = 0; i < musb->config->num_eps; ++i) {
2535 struct musb_hw_ep *hw_ep;
2536
2537 hw_ep = &musb->endpoints[i];
2538 if (!hw_ep)
2539 continue;
2540
2541 epio = hw_ep->regs;
2542 if (!epio)
2543 continue;
2544
2545 musb_writeb(musb_base, MUSB_INDEX, i);
2546 musb->context.index_regs[i].txmaxp =
2547 musb_readw(epio, MUSB_TXMAXP);
2548 musb->context.index_regs[i].txcsr =
2549 musb_readw(epio, MUSB_TXCSR);
2550 musb->context.index_regs[i].rxmaxp =
2551 musb_readw(epio, MUSB_RXMAXP);
2552 musb->context.index_regs[i].rxcsr =
2553 musb_readw(epio, MUSB_RXCSR);
2554
2555 if (musb->dyn_fifo) {
2556 musb->context.index_regs[i].txfifoadd =
2557 musb_read_txfifoadd(musb_base);
2558 musb->context.index_regs[i].rxfifoadd =
2559 musb_read_rxfifoadd(musb_base);
2560 musb->context.index_regs[i].txfifosz =
2561 musb_read_txfifosz(musb_base);
2562 musb->context.index_regs[i].rxfifosz =
2563 musb_read_rxfifosz(musb_base);
2564 }
2565
2566 musb->context.index_regs[i].txtype =
2567 musb_readb(epio, MUSB_TXTYPE);
2568 musb->context.index_regs[i].txinterval =
2569 musb_readb(epio, MUSB_TXINTERVAL);
2570 musb->context.index_regs[i].rxtype =
2571 musb_readb(epio, MUSB_RXTYPE);
2572 musb->context.index_regs[i].rxinterval =
2573 musb_readb(epio, MUSB_RXINTERVAL);
2574
2575 musb->context.index_regs[i].txfunaddr =
2576 musb_read_txfunaddr(musb, i);
2577 musb->context.index_regs[i].txhubaddr =
2578 musb_read_txhubaddr(musb, i);
2579 musb->context.index_regs[i].txhubport =
2580 musb_read_txhubport(musb, i);
2581
2582 musb->context.index_regs[i].rxfunaddr =
2583 musb_read_rxfunaddr(musb, i);
2584 musb->context.index_regs[i].rxhubaddr =
2585 musb_read_rxhubaddr(musb, i);
2586 musb->context.index_regs[i].rxhubport =
2587 musb_read_rxhubport(musb, i);
2588 }
2589}
2590
2591static void musb_restore_context(struct musb *musb)
2592{
2593 int i;
2594 void __iomem *musb_base = musb->mregs;
2595 void __iomem *epio;
2596 u8 power;
2597
2598 musb_writew(musb_base, MUSB_FRAME, musb->context.frame);
2599 musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode);
2600 musb_write_ulpi_buscontrol(musb->mregs, musb->context.busctl);
2601
2602 /* Don't affect SUSPENDM/RESUME bits in POWER reg */
2603 power = musb_readb(musb_base, MUSB_POWER);
2604 power &= MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME;
2605 musb->context.power &= ~(MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME);
2606 power |= musb->context.power;
2607 musb_writeb(musb_base, MUSB_POWER, power);
2608
2609 musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe);
2610 musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe);
2611 musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe);
2612 if (musb->context.devctl & MUSB_DEVCTL_SESSION)
2613 musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);
2614
2615 for (i = 0; i < musb->config->num_eps; ++i) {
2616 struct musb_hw_ep *hw_ep;
2617
2618 hw_ep = &musb->endpoints[i];
2619 if (!hw_ep)
2620 continue;
2621
2622 epio = hw_ep->regs;
2623 if (!epio)
2624 continue;
2625
2626 musb_writeb(musb_base, MUSB_INDEX, i);
2627 musb_writew(epio, MUSB_TXMAXP,
2628 musb->context.index_regs[i].txmaxp);
2629 musb_writew(epio, MUSB_TXCSR,
2630 musb->context.index_regs[i].txcsr);
2631 musb_writew(epio, MUSB_RXMAXP,
2632 musb->context.index_regs[i].rxmaxp);
2633 musb_writew(epio, MUSB_RXCSR,
2634 musb->context.index_regs[i].rxcsr);
2635
2636 if (musb->dyn_fifo) {
2637 musb_write_txfifosz(musb_base,
2638 musb->context.index_regs[i].txfifosz);
2639 musb_write_rxfifosz(musb_base,
2640 musb->context.index_regs[i].rxfifosz);
2641 musb_write_txfifoadd(musb_base,
2642 musb->context.index_regs[i].txfifoadd);
2643 musb_write_rxfifoadd(musb_base,
2644 musb->context.index_regs[i].rxfifoadd);
2645 }
2646
2647 musb_writeb(epio, MUSB_TXTYPE,
2648 musb->context.index_regs[i].txtype);
2649 musb_writeb(epio, MUSB_TXINTERVAL,
2650 musb->context.index_regs[i].txinterval);
2651 musb_writeb(epio, MUSB_RXTYPE,
2652 musb->context.index_regs[i].rxtype);
2653 musb_writeb(epio, MUSB_RXINTERVAL,
2654
2655 musb->context.index_regs[i].rxinterval);
2656 musb_write_txfunaddr(musb, i,
2657 musb->context.index_regs[i].txfunaddr);
2658 musb_write_txhubaddr(musb, i,
2659 musb->context.index_regs[i].txhubaddr);
2660 musb_write_txhubport(musb, i,
2661 musb->context.index_regs[i].txhubport);
2662
2663 musb_write_rxfunaddr(musb, i,
2664 musb->context.index_regs[i].rxfunaddr);
2665 musb_write_rxhubaddr(musb, i,
2666 musb->context.index_regs[i].rxhubaddr);
2667 musb_write_rxhubport(musb, i,
2668 musb->context.index_regs[i].rxhubport);
2669 }
2670 musb_writeb(musb_base, MUSB_INDEX, musb->context.index);
2671}
2672
2673static int musb_suspend(struct device *dev)
2674{
2675 struct musb *musb = dev_to_musb(dev);
2676 unsigned long flags;
2677
2678 musb_platform_disable(musb);
2679 musb_generic_disable(musb);
2680 WARN_ON(!list_empty(&musb->pending_list));
2681
2682 spin_lock_irqsave(&musb->lock, flags);
2683
2684 if (is_peripheral_active(musb)) {
2685 /* FIXME force disconnect unless we know USB will wake
2686 * the system up quickly enough to respond ...
2687 */
2688 } else if (is_host_active(musb)) {
2689 /* we know all the children are suspended; sometimes
2690 * they will even be wakeup-enabled.
2691 */
2692 }
2693
2694 musb_save_context(musb);
2695
2696 spin_unlock_irqrestore(&musb->lock, flags);
2697 return 0;
2698}
2699
2700static int musb_resume(struct device *dev)
2701{
2702 struct musb *musb = dev_to_musb(dev);
2703 unsigned long flags;
2704 int error;
2705 u8 devctl;
2706 u8 mask;
2707
2708 /*
2709 * For static cmos like DaVinci, register values were preserved
2710 * unless for some reason the whole soc powered down or the USB
2711 * module got reset through the PSC (vs just being disabled).
2712 *
2713 * For the DSPS glue layer though, a full register restore has to
2714 * be done. As it shouldn't harm other platforms, we do it
2715 * unconditionally.
2716 */
2717
2718 musb_restore_context(musb);
2719
2720 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2721 mask = MUSB_DEVCTL_BDEVICE | MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV;
2722 if ((devctl & mask) != (musb->context.devctl & mask))
2723 musb->port1_status = 0;
2724
2725 /*
2726 * The USB HUB code expects the device to be in RPM_ACTIVE once it came
2727 * out of suspend
2728 */
2729 pm_runtime_disable(dev);
2730 pm_runtime_set_active(dev);
2731 pm_runtime_enable(dev);
2732
2733 musb_start(musb);
2734
2735 spin_lock_irqsave(&musb->lock, flags);
2736 error = musb_run_resume_work(musb);
2737 if (error)
2738 dev_err(musb->controller, "resume work failed with %i\n",
2739 error);
2740 spin_unlock_irqrestore(&musb->lock, flags);
2741
2742 return 0;
2743}
2744
2745static int musb_runtime_suspend(struct device *dev)
2746{
2747 struct musb *musb = dev_to_musb(dev);
2748
2749 musb_save_context(musb);
2750 musb->is_runtime_suspended = 1;
2751
2752 return 0;
2753}
2754
2755static int musb_runtime_resume(struct device *dev)
2756{
2757 struct musb *musb = dev_to_musb(dev);
2758 unsigned long flags;
2759 int error;
2760
2761 /*
2762 * When pm_runtime_get_sync called for the first time in driver
2763 * init, some of the structure is still not initialized which is
2764 * used in restore function. But clock needs to be
2765 * enabled before any register access, so
2766 * pm_runtime_get_sync has to be called.
2767 * Also context restore without save does not make
2768 * any sense
2769 */
2770 if (!musb->is_initialized)
2771 return 0;
2772
2773 musb_restore_context(musb);
2774
2775 spin_lock_irqsave(&musb->lock, flags);
2776 error = musb_run_resume_work(musb);
2777 if (error)
2778 dev_err(musb->controller, "resume work failed with %i\n",
2779 error);
2780 musb->is_runtime_suspended = 0;
2781 spin_unlock_irqrestore(&musb->lock, flags);
2782
2783 return 0;
2784}
2785
2786static const struct dev_pm_ops musb_dev_pm_ops = {
2787 .suspend = musb_suspend,
2788 .resume = musb_resume,
2789 .runtime_suspend = musb_runtime_suspend,
2790 .runtime_resume = musb_runtime_resume,
2791};
2792
2793#define MUSB_DEV_PM_OPS (&musb_dev_pm_ops)
2794#else
2795#define MUSB_DEV_PM_OPS NULL
2796#endif
2797
2798static struct platform_driver musb_driver = {
2799 .driver = {
2800 .name = (char *)musb_driver_name,
2801 .bus = &platform_bus_type,
2802 .pm = MUSB_DEV_PM_OPS,
2803 },
2804 .probe = musb_probe,
2805 .remove = musb_remove,
2806};
2807
2808module_platform_driver(musb_driver);