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usb: musb: Don't set d+ high before enable for 2430 glue layer
[linux-block.git] / drivers / usb / musb / musb_core.c
CommitLineData
550a7375
FB		 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
550a7375 85 * - platform_device for addressing, irq, and platform_data
5ae477b0 86 * - platform_data is mostly for board-specific information
c767c1c6 87 * (plus recentrly, SOC or family details)
550a7375
FB		 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>
550a7375
FB		 96#include <linux/list.h>
97#include <linux/kobject.h>
9303961f 98#include <linux/prefetch.h>
550a7375
FB		 99#include <linux/platform_device.h>
100#include <linux/io.h>
8d2421e6 101#include <linux/dma-mapping.h>
309be239 102#include <linux/usb.h>
550a7375 103
550a7375
FB		 104#include "musb_core.h"
105
f7f9d63e 106#define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON)
550a7375
FB		 107
108
550a7375
FB		 109#define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia"
110#define DRIVER_DESC "Inventra Dual-Role USB Controller Driver"
111
e8164f64 112#define MUSB_VERSION "6.0"
550a7375
FB		 113
114#define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION
115
05ac10dd 116#define MUSB_DRIVER_NAME "musb-hdrc"
550a7375
FB		 117const char musb_driver_name[] = MUSB_DRIVER_NAME;
118
119MODULE_DESCRIPTION(DRIVER_INFO);
120MODULE_AUTHOR(DRIVER_AUTHOR);
121MODULE_LICENSE("GPL");
122MODULE_ALIAS("platform:" MUSB_DRIVER_NAME);
123
124
125/*-------------------------------------------------------------------------*/
126
127static inline struct musb *dev_to_musb(struct device *dev)
128{
550a7375 129 return dev_get_drvdata(dev);
550a7375
FB		 130}
131
132/*-------------------------------------------------------------------------*/
133
ffb865b1 134#ifndef CONFIG_BLACKFIN
705e63d2 135static int musb_ulpi_read(struct usb_phy *phy, u32 reg)
ffb865b1 136{
b96d3b08 137 void __iomem *addr = phy->io_priv;
ffb865b1
HK		 138 int i = 0;
139 u8 r;
140 u8 power;
bf070bc1
GI		 141 int ret;
142
143 pm_runtime_get_sync(phy->io_dev);
ffb865b1
HK		 144
145 /* Make sure the transceiver is not in low power mode */
146 power = musb_readb(addr, MUSB_POWER);
147 power &= ~MUSB_POWER_SUSPENDM;
148 musb_writeb(addr, MUSB_POWER, power);
149
150 /* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the
151 * ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM.
152 */
153
705e63d2 154 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
ffb865b1
HK		 155 musb_writeb(addr, MUSB_ULPI_REG_CONTROL,
156 MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR);
157
158 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
159 & MUSB_ULPI_REG_CMPLT)) {
160 i++;
bf070bc1
GI		 161 if (i == 10000) {
162 ret = -ETIMEDOUT;
163 goto out;
164 }
ffb865b1
HK		 165
166 }
167 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
168 r &= ~MUSB_ULPI_REG_CMPLT;
169 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
170
bf070bc1
GI		 171 ret = musb_readb(addr, MUSB_ULPI_REG_DATA);
172
173out:
174 pm_runtime_put(phy->io_dev);
175
176 return ret;
ffb865b1
HK		 177}
178
705e63d2 179static int musb_ulpi_write(struct usb_phy *phy, u32 val, u32 reg)
ffb865b1 180{
b96d3b08 181 void __iomem *addr = phy->io_priv;
ffb865b1
HK		 182 int i = 0;
183 u8 r = 0;
184 u8 power;
bf070bc1
GI		 185 int ret = 0;
186
187 pm_runtime_get_sync(phy->io_dev);
ffb865b1
HK		 188
189 /* Make sure the transceiver is not in low power mode */
190 power = musb_readb(addr, MUSB_POWER);
191 power &= ~MUSB_POWER_SUSPENDM;
192 musb_writeb(addr, MUSB_POWER, power);
193
705e63d2
UKK		 194 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
195 musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)val);
ffb865b1
HK		 196 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ);
197
198 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
199 & MUSB_ULPI_REG_CMPLT)) {
200 i++;
bf070bc1
GI		 201 if (i == 10000) {
202 ret = -ETIMEDOUT;
203 goto out;
204 }
ffb865b1
HK		 205 }
206
207 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
208 r &= ~MUSB_ULPI_REG_CMPLT;
209 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
210
bf070bc1
GI		 211out:
212 pm_runtime_put(phy->io_dev);
213
214 return ret;
ffb865b1
HK		 215}
216#else
f2263db7
MF		 217#define musb_ulpi_read NULL
218#define musb_ulpi_write NULL
ffb865b1
HK		 219#endif
220
b96d3b08 221static struct usb_phy_io_ops musb_ulpi_access = {
ffb865b1
HK		 222 .read = musb_ulpi_read,
223 .write = musb_ulpi_write,
224};
225
226/*-------------------------------------------------------------------------*/
227
1b40fc57
TL		 228static u32 musb_default_fifo_offset(u8 epnum)
229{
230 return 0x20 + (epnum * 4);
231}
232
d026e9c7
TL		 233/* "flat" mapping: each endpoint has its own i/o address */
234static void musb_flat_ep_select(void __iomem *mbase, u8 epnum)
235{
236}
237
238static u32 musb_flat_ep_offset(u8 epnum, u16 offset)
239{
240 return 0x100 + (0x10 * epnum) + offset;
241}
242
243/* "indexed" mapping: INDEX register controls register bank select */
244static void musb_indexed_ep_select(void __iomem *mbase, u8 epnum)
245{
246 musb_writeb(mbase, MUSB_INDEX, epnum);
247}
248
249static u32 musb_indexed_ep_offset(u8 epnum, u16 offset)
250{
251 return 0x10 + offset;
252}
253
6cc2af6d
HG		 254static u32 musb_default_busctl_offset(u8 epnum, u16 offset)
255{
256 return 0x80 + (0x08 * epnum) + offset;
257}
258
1b40fc57
TL		 259static u8 musb_default_readb(const void __iomem *addr, unsigned offset)
260{
261 return __raw_readb(addr + offset);
262}
263
264static void musb_default_writeb(void __iomem *addr, unsigned offset, u8 data)
265{
266 __raw_writeb(data, addr + offset);
267}
268
269static u16 musb_default_readw(const void __iomem *addr, unsigned offset)
270{
271 return __raw_readw(addr + offset);
272}
273
274static void musb_default_writew(void __iomem *addr, unsigned offset, u16 data)
275{
276 __raw_writew(data, addr + offset);
277}
278
279static u32 musb_default_readl(const void __iomem *addr, unsigned offset)
280{
281 return __raw_readl(addr + offset);
282}
283
284static void musb_default_writel(void __iomem *addr, unsigned offset, u32 data)
285{
286 __raw_writel(data, addr + offset);
287}
c6cf8b00 288
550a7375
FB		 289/*
290 * Load an endpoint's FIFO
291 */
1b40fc57
TL		 292static void musb_default_write_fifo(struct musb_hw_ep *hw_ep, u16 len,
293 const u8 *src)
550a7375 294{
5c8a86e1 295 struct musb *musb = hw_ep->musb;
550a7375
FB		 296 void __iomem *fifo = hw_ep->fifo;
297
603fe2b2
AKG		 298 if (unlikely(len == 0))
299 return;
300
550a7375
FB		 301 prefetch((u8 *)src);
302
5c8a86e1 303 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
550a7375
FB		 304 'T', hw_ep->epnum, fifo, len, src);
305
306 /* we can't assume unaligned reads work */
307 if (likely((0x01 & (unsigned long) src) == 0)) {
308 u16 index = 0;
309
310 /* best case is 32bit-aligned source address */
311 if ((0x02 & (unsigned long) src) == 0) {
312 if (len >= 4) {
2bf0a8f6 313 iowrite32_rep(fifo, src + index, len >> 2);
550a7375
FB		 314 index += len & ~0x03;
315 }
316 if (len & 0x02) {
be780381 317 __raw_writew(*(u16 *)&src[index], fifo);
550a7375
FB		 318 index += 2;
319 }
320 } else {
321 if (len >= 2) {
2bf0a8f6 322 iowrite16_rep(fifo, src + index, len >> 1);
550a7375
FB		 323 index += len & ~0x01;
324 }
325 }
326 if (len & 0x01)
be780381 327 __raw_writeb(src[index], fifo);
550a7375
FB		 328 } else {
329 /* byte aligned */
2bf0a8f6 330 iowrite8_rep(fifo, src, len);
550a7375
FB		 331 }
332}
333
334/*
335 * Unload an endpoint's FIFO
336 */
1b40fc57 337static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
550a7375 338{
5c8a86e1 339 struct musb *musb = hw_ep->musb;
550a7375
FB		 340 void __iomem *fifo = hw_ep->fifo;
341
603fe2b2
AKG		 342 if (unlikely(len == 0))
343 return;
344
5c8a86e1 345 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
550a7375
FB		 346 'R', hw_ep->epnum, fifo, len, dst);
347
348 /* we can't assume unaligned writes work */
349 if (likely((0x01 & (unsigned long) dst) == 0)) {
350 u16 index = 0;
351
352 /* best case is 32bit-aligned destination address */
353 if ((0x02 & (unsigned long) dst) == 0) {
354 if (len >= 4) {
2bf0a8f6 355 ioread32_rep(fifo, dst, len >> 2);
550a7375
FB		 356 index = len & ~0x03;
357 }
358 if (len & 0x02) {
be780381 359 *(u16 *)&dst[index] = __raw_readw(fifo);
550a7375
FB		 360 index += 2;
361 }
362 } else {
363 if (len >= 2) {
2bf0a8f6 364 ioread16_rep(fifo, dst, len >> 1);
550a7375
FB		 365 index = len & ~0x01;
366 }
367 }
368 if (len & 0x01)
be780381 369 dst[index] = __raw_readb(fifo);
550a7375
FB		 370 } else {
371 /* byte aligned */
2bf0a8f6 372 ioread8_rep(fifo, dst, len);
550a7375
FB		 373 }
374}
375
1b40fc57
TL		 376/*
377 * Old style IO functions
378 */
379u8 (*musb_readb)(const void __iomem *addr, unsigned offset);
380EXPORT_SYMBOL_GPL(musb_readb);
381
382void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
383EXPORT_SYMBOL_GPL(musb_writeb);
550a7375 384
1b40fc57
TL		 385u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
386EXPORT_SYMBOL_GPL(musb_readw);
387
388void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
389EXPORT_SYMBOL_GPL(musb_writew);
390
391u32 (*musb_readl)(const void __iomem *addr, unsigned offset);
392EXPORT_SYMBOL_GPL(musb_readl);
393
394void (*musb_writel)(void __iomem *addr, unsigned offset, u32 data);
395EXPORT_SYMBOL_GPL(musb_writel);
396
7f6283ed
TL		 397#ifndef CONFIG_MUSB_PIO_ONLY
398struct dma_controller *
399(*musb_dma_controller_create)(struct musb *musb, void __iomem *base);
400EXPORT_SYMBOL(musb_dma_controller_create);
401
402void (*musb_dma_controller_destroy)(struct dma_controller *c);
403EXPORT_SYMBOL(musb_dma_controller_destroy);
404#endif
405
1b40fc57
TL		 406/*
407 * New style IO functions
408 */
409void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
410{
411 return hw_ep->musb->io.read_fifo(hw_ep, len, dst);
412}
413
414void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
415{
416 return hw_ep->musb->io.write_fifo(hw_ep, len, src);
417}
550a7375
FB		 418
419/*-------------------------------------------------------------------------*/
420
421/* for high speed test mode; see USB 2.0 spec 7.1.20 */
422static const u8 musb_test_packet[53] = {
423 /* implicit SYNC then DATA0 to start */
424
425 /* JKJKJKJK x9 */
426 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
427 /* JJKKJJKK x8 */
428 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
429 /* JJJJKKKK x8 */
430 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
431 /* JJJJJJJKKKKKKK x8 */
432 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
433 /* JJJJJJJK x8 */
434 0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd,
435 /* JKKKKKKK x10, JK */
436 0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e
437
438 /* implicit CRC16 then EOP to end */
439};
440
441void musb_load_testpacket(struct musb *musb)
442{
443 void __iomem *regs = musb->endpoints[0].regs;
444
445 musb_ep_select(musb->mregs, 0);
446 musb_write_fifo(musb->control_ep,
447 sizeof(musb_test_packet), musb_test_packet);
448 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY);
449}
450
451/*-------------------------------------------------------------------------*/
452
550a7375
FB		 453/*
454 * Handles OTG hnp timeouts, such as b_ase0_brst
455 */
a156544b 456static void musb_otg_timer_func(unsigned long data)
550a7375
FB		 457{
458 struct musb *musb = (struct musb *)data;
459 unsigned long flags;
460
461 spin_lock_irqsave(&musb->lock, flags);
e47d9254 462 switch (musb->xceiv->otg->state) {
550a7375 463 case OTG_STATE_B_WAIT_ACON:
5c8a86e1 464 dev_dbg(musb->controller, "HNP: b_wait_acon timeout; back to b_peripheral\n");
550a7375 465 musb_g_disconnect(musb);
e47d9254 466 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
550a7375
FB		 467 musb->is_active = 0;
468 break;
ab983f2a 469 case OTG_STATE_A_SUSPEND:
550a7375 470 case OTG_STATE_A_WAIT_BCON:
5c8a86e1 471 dev_dbg(musb->controller, "HNP: %s timeout\n",
e47d9254 472 usb_otg_state_string(musb->xceiv->otg->state));
743411b3 473 musb_platform_set_vbus(musb, 0);
e47d9254 474 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
550a7375
FB		 475 break;
476 default:
5c8a86e1 477 dev_dbg(musb->controller, "HNP: Unhandled mode %s\n",
e47d9254 478 usb_otg_state_string(musb->xceiv->otg->state));
550a7375 479 }
550a7375
FB		 480 spin_unlock_irqrestore(&musb->lock, flags);
481}
482
550a7375 483/*
f7f9d63e 484 * Stops the HNP transition. Caller must take care of locking.
550a7375
FB		 485 */
486void musb_hnp_stop(struct musb *musb)
487{
8b125df5 488 struct usb_hcd *hcd = musb->hcd;
550a7375
FB		 489 void __iomem *mbase = musb->mregs;
490 u8 reg;
491
42c0bf1c 492 dev_dbg(musb->controller, "HNP: stop from %s\n",
e47d9254 493 usb_otg_state_string(musb->xceiv->otg->state));
ab983f2a 494
e47d9254 495 switch (musb->xceiv->otg->state) {
550a7375 496 case OTG_STATE_A_PERIPHERAL:
550a7375 497 musb_g_disconnect(musb);
5c8a86e1 498 dev_dbg(musb->controller, "HNP: back to %s\n",
e47d9254 499 usb_otg_state_string(musb->xceiv->otg->state));
550a7375
FB		 500 break;
501 case OTG_STATE_B_HOST:
5c8a86e1 502 dev_dbg(musb->controller, "HNP: Disabling HR\n");
74c2e936
DM		 503 if (hcd)
504 hcd->self.is_b_host = 0;
e47d9254 505 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
550a7375
FB		 506 MUSB_DEV_MODE(musb);
507 reg = musb_readb(mbase, MUSB_POWER);
508 reg |= MUSB_POWER_SUSPENDM;
509 musb_writeb(mbase, MUSB_POWER, reg);
510 /* REVISIT: Start SESSION_REQUEST here? */
511 break;
512 default:
5c8a86e1 513 dev_dbg(musb->controller, "HNP: Stopping in unknown state %s\n",
e47d9254 514 usb_otg_state_string(musb->xceiv->otg->state));
550a7375
FB		 515 }
516
517 /*
518 * When returning to A state after HNP, avoid hub_port_rebounce(),
519 * which cause occasional OPT A "Did not receive reset after connect"
520 * errors.
521 */
749da5f8 522 musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16);
550a7375
FB		 523}
524
83b8f5b8 525static void musb_recover_from_babble(struct musb *musb);
e1eb3eb8 526
550a7375
FB		 527/*
528 * Interrupt Service Routine to record USB "global" interrupts.
529 * Since these do not happen often and signify things of
530 * paramount importance, it seems OK to check them individually;
531 * the order of the tests is specified in the manual
532 *
533 * @param musb instance pointer
534 * @param int_usb register contents
535 * @param devctl
536 * @param power
537 */
538
550a7375 539static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
b11e94d0 540 u8 devctl)
550a7375
FB		 541{
542 irqreturn_t handled = IRQ_NONE;
550a7375 543
b11e94d0 544 dev_dbg(musb->controller, "<== DevCtl=%02x, int_usb=0x%x\n", devctl,
550a7375
FB		 545 int_usb);
546
547 /* in host mode, the peripheral may issue remote wakeup.
548 * in peripheral mode, the host may resume the link.
549 * spurious RESUME irqs happen too, paired with SUSPEND.
550 */
551 if (int_usb & MUSB_INTR_RESUME) {
552 handled = IRQ_HANDLED;
0acff6b8
FB		 553 dev_dbg(musb->controller, "RESUME (%s)\n",
554 usb_otg_state_string(musb->xceiv->otg->state));
550a7375
FB		 555
556 if (devctl & MUSB_DEVCTL_HM) {
e47d9254 557 switch (musb->xceiv->otg->state) {
550a7375
FB		 558 case OTG_STATE_A_SUSPEND:
559 /* remote wakeup? later, GetPortStatus
560 * will stop RESUME signaling
561 */
562
550a7375
FB		 563 musb->port1_status |=
564 (USB_PORT_STAT_C_SUSPEND << 16)
565 | MUSB_PORT_STAT_RESUME;
30d361bf 566 musb->rh_timer = jiffies
309be239 567 + msecs_to_jiffies(USB_RESUME_TIMEOUT);
baadd52f 568 musb->need_finish_resume = 1;
550a7375 569
e47d9254 570 musb->xceiv->otg->state = OTG_STATE_A_HOST;
550a7375 571 musb->is_active = 1;
9298b4aa 572 musb_host_resume_root_hub(musb);
550a7375
FB		 573 break;
574 case OTG_STATE_B_WAIT_ACON:
e47d9254 575 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
550a7375
FB		 576 musb->is_active = 1;
577 MUSB_DEV_MODE(musb);
578 break;
579 default:
580 WARNING("bogus %s RESUME (%s)\n",
581 "host",
e47d9254 582 usb_otg_state_string(musb->xceiv->otg->state));
550a7375 583 }
550a7375 584 } else {
e47d9254 585 switch (musb->xceiv->otg->state) {
550a7375
FB		 586 case OTG_STATE_A_SUSPEND:
587 /* possibly DISCONNECT is upcoming */
e47d9254 588 musb->xceiv->otg->state = OTG_STATE_A_HOST;
0b3eba44 589 musb_host_resume_root_hub(musb);
550a7375 590 break;
550a7375
FB		 591 case OTG_STATE_B_WAIT_ACON:
592 case OTG_STATE_B_PERIPHERAL:
593 /* disconnect while suspended? we may
594 * not get a disconnect irq...
595 */
596 if ((devctl & MUSB_DEVCTL_VBUS)
597 != (3 << MUSB_DEVCTL_VBUS_SHIFT)
598 ) {
599 musb->int_usb |= MUSB_INTR_DISCONNECT;
600 musb->int_usb &= ~MUSB_INTR_SUSPEND;
601 break;
602 }
603 musb_g_resume(musb);
604 break;
605 case OTG_STATE_B_IDLE:
606 musb->int_usb &= ~MUSB_INTR_SUSPEND;
607 break;
550a7375
FB		 608 default:
609 WARNING("bogus %s RESUME (%s)\n",
610 "peripheral",
e47d9254 611 usb_otg_state_string(musb->xceiv->otg->state));
550a7375
FB		 612 }
613 }
614 }
615
550a7375
FB		 616 /* see manual for the order of the tests */
617 if (int_usb & MUSB_INTR_SESSREQ) {
aa471456
FB		 618 void __iomem *mbase = musb->mregs;
619
19aab56c
HK		 620 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS
621 && (devctl & MUSB_DEVCTL_BDEVICE)) {
5c8a86e1 622 dev_dbg(musb->controller, "SessReq while on B state\n");
a6038ee7
HK		 623 return IRQ_HANDLED;
624 }
625
5c8a86e1 626 dev_dbg(musb->controller, "SESSION_REQUEST (%s)\n",
e47d9254 627 usb_otg_state_string(musb->xceiv->otg->state));
550a7375
FB		 628
629 /* IRQ arrives from ID pin sense or (later, if VBUS power
630 * is removed) SRP. responses are time critical:
631 * - turn on VBUS (with silicon-specific mechanism)
632 * - go through A_WAIT_VRISE
633 * - ... to A_WAIT_BCON.
634 * a_wait_vrise_tmout triggers VBUS_ERROR transitions
635 */
636 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
637 musb->ep0_stage = MUSB_EP0_START;
e47d9254 638 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
550a7375 639 MUSB_HST_MODE(musb);
743411b3 640 musb_platform_set_vbus(musb, 1);
550a7375
FB		 641
642 handled = IRQ_HANDLED;
643 }
644
645 if (int_usb & MUSB_INTR_VBUSERROR) {
646 int ignore = 0;
647
648 /* During connection as an A-Device, we may see a short
649 * current spikes causing voltage drop, because of cable
650 * and peripheral capacitance combined with vbus draw.
651 * (So: less common with truly self-powered devices, where
652 * vbus doesn't act like a power supply.)
653 *
654 * Such spikes are short; usually less than ~500 usec, max
655 * of ~2 msec. That is, they're not sustained overcurrent
656 * errors, though they're reported using VBUSERROR irqs.
657 *
658 * Workarounds: (a) hardware: use self powered devices.
659 * (b) software: ignore non-repeated VBUS errors.
660 *
661 * REVISIT: do delays from lots of DEBUG_KERNEL checks
662 * make trouble here, keeping VBUS < 4.4V ?
663 */
e47d9254 664 switch (musb->xceiv->otg->state) {
550a7375
FB		 665 case OTG_STATE_A_HOST:
666 /* recovery is dicey once we've gotten past the
667 * initial stages of enumeration, but if VBUS
668 * stayed ok at the other end of the link, and
669 * another reset is due (at least for high speed,
670 * to redo the chirp etc), it might work OK...
671 */
672 case OTG_STATE_A_WAIT_BCON:
673 case OTG_STATE_A_WAIT_VRISE:
674 if (musb->vbuserr_retry) {
aa471456
FB		 675 void __iomem *mbase = musb->mregs;
676
550a7375
FB		 677 musb->vbuserr_retry--;
678 ignore = 1;
679 devctl |= MUSB_DEVCTL_SESSION;
680 musb_writeb(mbase, MUSB_DEVCTL, devctl);
681 } else {
682 musb->port1_status |=
749da5f8
AS		 683 USB_PORT_STAT_OVERCURRENT
684 | (USB_PORT_STAT_C_OVERCURRENT << 16);
550a7375
FB		 685 }
686 break;
687 default:
688 break;
689 }
690
54485116
GI		 691 dev_printk(ignore ? KERN_DEBUG : KERN_ERR, musb->controller,
692 "VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n",
e47d9254 693 usb_otg_state_string(musb->xceiv->otg->state),
550a7375
FB		 694 devctl,
695 ({ char *s;
696 switch (devctl & MUSB_DEVCTL_VBUS) {
697 case 0 << MUSB_DEVCTL_VBUS_SHIFT:
698 s = "<SessEnd"; break;
699 case 1 << MUSB_DEVCTL_VBUS_SHIFT:
700 s = "<AValid"; break;
701 case 2 << MUSB_DEVCTL_VBUS_SHIFT:
702 s = "<VBusValid"; break;
703 /* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */
704 default:
705 s = "VALID"; break;
2b84f92b 706 } s; }),
550a7375
FB		 707 VBUSERR_RETRY_COUNT - musb->vbuserr_retry,
708 musb->port1_status);
709
710 /* go through A_WAIT_VFALL then start a new session */
711 if (!ignore)
743411b3 712 musb_platform_set_vbus(musb, 0);
550a7375
FB		 713 handled = IRQ_HANDLED;
714 }
715
1c25fda4 716 if (int_usb & MUSB_INTR_SUSPEND) {
b11e94d0 717 dev_dbg(musb->controller, "SUSPEND (%s) devctl %02x\n",
e47d9254 718 usb_otg_state_string(musb->xceiv->otg->state), devctl);
1c25fda4
AM		 719 handled = IRQ_HANDLED;
720
e47d9254 721 switch (musb->xceiv->otg->state) {
1c25fda4
AM		 722 case OTG_STATE_A_PERIPHERAL:
723 /* We also come here if the cable is removed, since
724 * this silicon doesn't report ID-no-longer-grounded.
725 *
726 * We depend on T(a_wait_bcon) to shut us down, and
727 * hope users don't do anything dicey during this
728 * undesired detour through A_WAIT_BCON.
729 */
730 musb_hnp_stop(musb);
0b3eba44 731 musb_host_resume_root_hub(musb);
1c25fda4
AM		 732 musb_root_disconnect(musb);
733 musb_platform_try_idle(musb, jiffies
734 + msecs_to_jiffies(musb->a_wait_bcon
735 ? : OTG_TIME_A_WAIT_BCON));
736
737 break;
1c25fda4
AM		 738 case OTG_STATE_B_IDLE:
739 if (!musb->is_active)
740 break;
741 case OTG_STATE_B_PERIPHERAL:
742 musb_g_suspend(musb);
eee3f15d 743 musb->is_active = musb->g.b_hnp_enable;
1c25fda4 744 if (musb->is_active) {
e47d9254 745 musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
5c8a86e1 746 dev_dbg(musb->controller, "HNP: Setting timer for b_ase0_brst\n");
1c25fda4
AM		 747 mod_timer(&musb->otg_timer, jiffies
748 + msecs_to_jiffies(
749 OTG_TIME_B_ASE0_BRST));
1c25fda4
AM		 750 }
751 break;
752 case OTG_STATE_A_WAIT_BCON:
753 if (musb->a_wait_bcon != 0)
754 musb_platform_try_idle(musb, jiffies
755 + msecs_to_jiffies(musb->a_wait_bcon));
756 break;
757 case OTG_STATE_A_HOST:
e47d9254 758 musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
eee3f15d 759 musb->is_active = musb->hcd->self.b_hnp_enable;
1c25fda4
AM		 760 break;
761 case OTG_STATE_B_HOST:
762 /* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */
5c8a86e1 763 dev_dbg(musb->controller, "REVISIT: SUSPEND as B_HOST\n");
1c25fda4
AM		 764 break;
765 default:
766 /* "should not happen" */
767 musb->is_active = 0;
768 break;
769 }
770 }
771
550a7375 772 if (int_usb & MUSB_INTR_CONNECT) {
8b125df5 773 struct usb_hcd *hcd = musb->hcd;
550a7375
FB		 774
775 handled = IRQ_HANDLED;
776 musb->is_active = 1;
550a7375
FB		 777
778 musb->ep0_stage = MUSB_EP0_START;
779
b18d26f6
SAS		 780 musb->intrtxe = musb->epmask;
781 musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe);
af5ec14d
SAS		 782 musb->intrrxe = musb->epmask & 0xfffe;
783 musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe);
d709d22e 784 musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7);
550a7375
FB		 785 musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED
786 |USB_PORT_STAT_HIGH_SPEED
787 |USB_PORT_STAT_ENABLE
788 );
789 musb->port1_status |= USB_PORT_STAT_CONNECTION
790 |(USB_PORT_STAT_C_CONNECTION << 16);
791
792 /* high vs full speed is just a guess until after reset */
793 if (devctl & MUSB_DEVCTL_LSDEV)
794 musb->port1_status |= USB_PORT_STAT_LOW_SPEED;
795
550a7375 796 /* indicate new connection to OTG machine */
e47d9254 797 switch (musb->xceiv->otg->state) {
550a7375
FB		 798 case OTG_STATE_B_PERIPHERAL:
799 if (int_usb & MUSB_INTR_SUSPEND) {
5c8a86e1 800 dev_dbg(musb->controller, "HNP: SUSPEND+CONNECT, now b_host\n");
550a7375 801 int_usb &= ~MUSB_INTR_SUSPEND;
1de00dae 802 goto b_host;
550a7375 803 } else
5c8a86e1 804 dev_dbg(musb->controller, "CONNECT as b_peripheral???\n");
550a7375
FB		 805 break;
806 case OTG_STATE_B_WAIT_ACON:
5c8a86e1 807 dev_dbg(musb->controller, "HNP: CONNECT, now b_host\n");
1de00dae 808b_host:
e47d9254 809 musb->xceiv->otg->state = OTG_STATE_B_HOST;
74c2e936
DM		 810 if (musb->hcd)
811 musb->hcd->self.is_b_host = 1;
1de00dae 812 del_timer(&musb->otg_timer);
550a7375
FB		 813 break;
814 default:
815 if ((devctl & MUSB_DEVCTL_VBUS)
816 == (3 << MUSB_DEVCTL_VBUS_SHIFT)) {
e47d9254 817 musb->xceiv->otg->state = OTG_STATE_A_HOST;
0b3eba44
DM		 818 if (hcd)
819 hcd->self.is_b_host = 0;
550a7375
FB		 820 }
821 break;
822 }
1de00dae 823
0b3eba44 824 musb_host_poke_root_hub(musb);
1de00dae 825
5c8a86e1 826 dev_dbg(musb->controller, "CONNECT (%s) devctl %02x\n",
e47d9254 827 usb_otg_state_string(musb->xceiv->otg->state), devctl);
550a7375 828 }
550a7375 829
6d349671 830 if (int_usb & MUSB_INTR_DISCONNECT) {
5c8a86e1 831 dev_dbg(musb->controller, "DISCONNECT (%s) as %s, devctl %02x\n",
e47d9254 832 usb_otg_state_string(musb->xceiv->otg->state),
1c25fda4
AM		 833 MUSB_MODE(musb), devctl);
834 handled = IRQ_HANDLED;
835
e47d9254 836 switch (musb->xceiv->otg->state) {
1c25fda4
AM		 837 case OTG_STATE_A_HOST:
838 case OTG_STATE_A_SUSPEND:
0b3eba44 839 musb_host_resume_root_hub(musb);
1c25fda4 840 musb_root_disconnect(musb);
032ec49f 841 if (musb->a_wait_bcon != 0)
1c25fda4
AM		 842 musb_platform_try_idle(musb, jiffies
843 + msecs_to_jiffies(musb->a_wait_bcon));
844 break;
1c25fda4
AM		 845 case OTG_STATE_B_HOST:
846 /* REVISIT this behaves for "real disconnect"
847 * cases; make sure the other transitions from
848 * from B_HOST act right too. The B_HOST code
849 * in hnp_stop() is currently not used...
850 */
851 musb_root_disconnect(musb);
74c2e936
DM		 852 if (musb->hcd)
853 musb->hcd->self.is_b_host = 0;
e47d9254 854 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
1c25fda4
AM		 855 MUSB_DEV_MODE(musb);
856 musb_g_disconnect(musb);
857 break;
858 case OTG_STATE_A_PERIPHERAL:
859 musb_hnp_stop(musb);
860 musb_root_disconnect(musb);
861 /* FALLTHROUGH */
862 case OTG_STATE_B_WAIT_ACON:
863 /* FALLTHROUGH */
1c25fda4
AM		 864 case OTG_STATE_B_PERIPHERAL:
865 case OTG_STATE_B_IDLE:
866 musb_g_disconnect(musb);
867 break;
1c25fda4
AM		 868 default:
869 WARNING("unhandled DISCONNECT transition (%s)\n",
e47d9254 870 usb_otg_state_string(musb->xceiv->otg->state));
1c25fda4
AM		 871 break;
872 }
873 }
874
550a7375
FB		 875 /* mentor saves a bit: bus reset and babble share the same irq.
876 * only host sees babble; only peripheral sees bus reset.
877 */
878 if (int_usb & MUSB_INTR_RESET) {
1c25fda4 879 handled = IRQ_HANDLED;
896f7ea3 880 if (devctl & MUSB_DEVCTL_HM) {
550a7375 881 /*
34754dec 882 * When BABBLE happens what we can depends on which
28378d5e
FB		 883 * platform MUSB is running, because some platforms
884 * implemented proprietary means for 'recovering' from
885 * Babble conditions. One such platform is AM335x. In
34754dec
FB		 886 * most cases, however, the only thing we can do is
887 * drop the session.
550a7375 888 */
34754dec 889 dev_err(musb->controller, "Babble\n");
d0fc0a20 890
34754dec
FB		 891 if (is_host_active(musb))
892 musb_recover_from_babble(musb);
a04d46d0 893 } else {
5c8a86e1 894 dev_dbg(musb->controller, "BUS RESET as %s\n",
e47d9254
AT		 895 usb_otg_state_string(musb->xceiv->otg->state));
896 switch (musb->xceiv->otg->state) {
550a7375 897 case OTG_STATE_A_SUSPEND:
550a7375
FB		 898 musb_g_reset(musb);
899 /* FALLTHROUGH */
900 case OTG_STATE_A_WAIT_BCON: /* OPT TD.4.7-900ms */
f7f9d63e 901 /* never use invalid T(a_wait_bcon) */
5c8a86e1 902 dev_dbg(musb->controller, "HNP: in %s, %d msec timeout\n",
e47d9254 903 usb_otg_state_string(musb->xceiv->otg->state),
3df00453 904 TA_WAIT_BCON(musb));
f7f9d63e
DB		 905 mod_timer(&musb->otg_timer, jiffies
906 + msecs_to_jiffies(TA_WAIT_BCON(musb)));
550a7375
FB		 907 break;
908 case OTG_STATE_A_PERIPHERAL:
1de00dae
DB		 909 del_timer(&musb->otg_timer);
910 musb_g_reset(musb);
550a7375
FB		 911 break;
912 case OTG_STATE_B_WAIT_ACON:
5c8a86e1 913 dev_dbg(musb->controller, "HNP: RESET (%s), to b_peripheral\n",
e47d9254
AT		 914 usb_otg_state_string(musb->xceiv->otg->state));
915 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
550a7375
FB		 916 musb_g_reset(musb);
917 break;
550a7375 918 case OTG_STATE_B_IDLE:
e47d9254 919 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
550a7375
FB		 920 /* FALLTHROUGH */
921 case OTG_STATE_B_PERIPHERAL:
922 musb_g_reset(musb);
923 break;
924 default:
5c8a86e1 925 dev_dbg(musb->controller, "Unhandled BUS RESET as %s\n",
e47d9254 926 usb_otg_state_string(musb->xceiv->otg->state));
550a7375
FB		 927 }
928 }
550a7375 929 }
550a7375
FB		 930
931#if 0
932/* REVISIT ... this would be for multiplexing periodic endpoints, or
933 * supporting transfer phasing to prevent exceeding ISO bandwidth
934 * limits of a given frame or microframe.
935 *
936 * It's not needed for peripheral side, which dedicates endpoints;
937 * though it _might_ use SOF irqs for other purposes.
938 *
939 * And it's not currently needed for host side, which also dedicates
940 * endpoints, relies on TX/RX interval registers, and isn't claimed
941 * to support ISO transfers yet.
942 */
943 if (int_usb & MUSB_INTR_SOF) {
944 void __iomem *mbase = musb->mregs;
945 struct musb_hw_ep *ep;
946 u8 epnum;
947 u16 frame;
948
5c8a86e1 949 dev_dbg(musb->controller, "START_OF_FRAME\n");
550a7375
FB		 950 handled = IRQ_HANDLED;
951
952 /* start any periodic Tx transfers waiting for current frame */
953 frame = musb_readw(mbase, MUSB_FRAME);
954 ep = musb->endpoints;
955 for (epnum = 1; (epnum < musb->nr_endpoints)
956 && (musb->epmask >= (1 << epnum));
957 epnum++, ep++) {
958 /*
959 * FIXME handle framecounter wraps (12 bits)
960 * eliminate duplicated StartUrb logic
961 */
962 if (ep->dwWaitFrame >= frame) {
963 ep->dwWaitFrame = 0;
964 pr_debug("SOF --> periodic TX%s on %d\n",
965 ep->tx_channel ? " DMA" : "",
966 epnum);
967 if (!ep->tx_channel)
968 musb_h_tx_start(musb, epnum);
969 else
970 cppi_hostdma_start(musb, epnum);
971 }
972 } /* end of for loop */
973 }
974#endif
975
1c25fda4 976 schedule_work(&musb->irq_work);
550a7375
FB		 977
978 return handled;
979}
980
981/*-------------------------------------------------------------------------*/
982
e1eb3eb8 983static void musb_disable_interrupts(struct musb *musb)
550a7375
FB		 984{
985 void __iomem *mbase = musb->mregs;
986 u16 temp;
987
988 /* disable interrupts */
989 musb_writeb(mbase, MUSB_INTRUSBE, 0);
b18d26f6 990 musb->intrtxe = 0;
550a7375 991 musb_writew(mbase, MUSB_INTRTXE, 0);
af5ec14d 992 musb->intrrxe = 0;
550a7375
FB		 993 musb_writew(mbase, MUSB_INTRRXE, 0);
994
550a7375
FB		 995 /* flush pending interrupts */
996 temp = musb_readb(mbase, MUSB_INTRUSB);
997 temp = musb_readw(mbase, MUSB_INTRTX);
998 temp = musb_readw(mbase, MUSB_INTRRX);
e1eb3eb8
FB		 999}
1000
1001static void musb_enable_interrupts(struct musb *musb)
1002{
1003 void __iomem *regs = musb->mregs;
1004
1005 /* Set INT enable registers, enable interrupts */
1006 musb->intrtxe = musb->epmask;
1007 musb_writew(regs, MUSB_INTRTXE, musb->intrtxe);
1008 musb->intrrxe = musb->epmask & 0xfffe;
1009 musb_writew(regs, MUSB_INTRRXE, musb->intrrxe);
1010 musb_writeb(regs, MUSB_INTRUSBE, 0xf7);
550a7375
FB		 1011
1012}
1013
e1eb3eb8
FB		 1014static void musb_generic_disable(struct musb *musb)
1015{
1016 void __iomem *mbase = musb->mregs;
1017
1018 musb_disable_interrupts(musb);
1019
1020 /* off */
1021 musb_writeb(mbase, MUSB_DEVCTL, 0);
1022}
1023
001dd84a
SAS		 1024/*
1025 * Program the HDRC to start (enable interrupts, dma, etc.).
1026 */
1027void musb_start(struct musb *musb)
1028{
1029 void __iomem *regs = musb->mregs;
1030 u8 devctl = musb_readb(regs, MUSB_DEVCTL);
9b753764 1031 u8 power;
001dd84a
SAS		 1032
1033 dev_dbg(musb->controller, "<== devctl %02x\n", devctl);
1034
e1eb3eb8 1035 musb_enable_interrupts(musb);
001dd84a
SAS		 1036 musb_writeb(regs, MUSB_TESTMODE, 0);
1037
9b753764
BL		 1038 power = MUSB_POWER_ISOUPDATE;
1039 /*
1040 * treating UNKNOWN as unspecified maximum speed, in which case
1041 * we will default to high-speed.
1042 */
1043 if (musb->config->maximum_speed == USB_SPEED_HIGH ||
1044 musb->config->maximum_speed == USB_SPEED_UNKNOWN)
1045 power |= MUSB_POWER_HSENAB;
1046 musb_writeb(regs, MUSB_POWER, power);
001dd84a
SAS		 1047
1048 musb->is_active = 0;
1049 devctl = musb_readb(regs, MUSB_DEVCTL);
1050 devctl &= ~MUSB_DEVCTL_SESSION;
1051
1052 /* session started after:
1053 * (a) ID-grounded irq, host mode;
1054 * (b) vbus present/connect IRQ, peripheral mode;
1055 * (c) peripheral initiates, using SRP
1056 */
1057 if (musb->port_mode != MUSB_PORT_MODE_HOST &&
40af177e 1058 musb->xceiv->otg->state != OTG_STATE_A_WAIT_BCON &&
001dd84a
SAS		 1059 (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) {
1060 musb->is_active = 1;
1061 } else {
1062 devctl |= MUSB_DEVCTL_SESSION;
1063 }
1064
1065 musb_platform_enable(musb);
1066 musb_writeb(regs, MUSB_DEVCTL, devctl);
1067}
1068
550a7375
FB		 1069/*
1070 * Make the HDRC stop (disable interrupts, etc.);
1071 * reversible by musb_start
1072 * called on gadget driver unregister
1073 * with controller locked, irqs blocked
1074 * acts as a NOP unless some role activated the hardware
1075 */
1076void musb_stop(struct musb *musb)
1077{
1078 /* stop IRQs, timers, ... */
1079 musb_platform_disable(musb);
1080 musb_generic_disable(musb);
5c8a86e1 1081 dev_dbg(musb->controller, "HDRC disabled\n");
550a7375
FB		 1082
1083 /* FIXME
1084 * - mark host and/or peripheral drivers unusable/inactive
1085 * - disable DMA (and enable it in HdrcStart)
1086 * - make sure we can musb_start() after musb_stop(); with
1087 * OTG mode, gadget driver module rmmod/modprobe cycles that
1088 * - ...
1089 */
1090 musb_platform_try_idle(musb, 0);
1091}
1092
550a7375
FB		 1093/*-------------------------------------------------------------------------*/
1094
1095/*
1096 * The silicon either has hard-wired endpoint configurations, or else
1097 * "dynamic fifo" sizing. The driver has support for both, though at this
c767c1c6
DB		 1098 * writing only the dynamic sizing is very well tested. Since we switched
1099 * away from compile-time hardware parameters, we can no longer rely on
1100 * dead code elimination to leave only the relevant one in the object file.
550a7375
FB		 1101 *
1102 * We don't currently use dynamic fifo setup capability to do anything
1103 * more than selecting one of a bunch of predefined configurations.
1104 */
8a77f05a 1105static ushort fifo_mode;
550a7375
FB		 1106
1107/* "modprobe ... fifo_mode=1" etc */
1108module_param(fifo_mode, ushort, 0);
1109MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration");
1110
550a7375
FB		 1111/*
1112 * tables defining fifo_mode values. define more if you like.
1113 * for host side, make sure both halves of ep1 are set up.
1114 */
1115
1116/* mode 0 - fits in 2KB */
d3608b6d 1117static struct musb_fifo_cfg mode_0_cfg[] = {
550a7375
FB		 1118{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1119{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1120{ .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, },
1121{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1122{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1123};
1124
1125/* mode 1 - fits in 4KB */
d3608b6d 1126static struct musb_fifo_cfg mode_1_cfg[] = {
550a7375
FB		 1127{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1128{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1129{ .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1130{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1131{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1132};
1133
1134/* mode 2 - fits in 4KB */
d3608b6d 1135static struct musb_fifo_cfg mode_2_cfg[] = {
550a7375
FB		 1136{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1137{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1138{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1139{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1140{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1141{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1142};
1143
1144/* mode 3 - fits in 4KB */
d3608b6d 1145static struct musb_fifo_cfg mode_3_cfg[] = {
550a7375
FB		 1146{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1147{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1148{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1149{ .hw_ep_num = 2, .style = FIFO_RX, .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 4 - fits in 16KB */
d3608b6d 1155static struct musb_fifo_cfg mode_4_cfg[] = {
550a7375
FB		 1156{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1157{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1158{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1159{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1160{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
1161{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
1162{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
1163{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
1164{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
1165{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
1166{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 512, },
1167{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 512, },
1168{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, },
1169{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 512, },
1170{ .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 512, },
1171{ .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 512, },
1172{ .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 512, },
1173{ .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 512, },
a483d706
AKG		 1174{ .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 256, },
1175{ .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 64, },
1176{ .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 256, },
1177{ .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 64, },
1178{ .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 256, },
1179{ .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 64, },
1180{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, },
550a7375
FB		 1181{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1182{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1183};
1184
3b151526 1185/* mode 5 - fits in 8KB */
d3608b6d 1186static struct musb_fifo_cfg mode_5_cfg[] = {
3b151526
AKG		 1187{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
1188{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
1189{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
1190{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
1191{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
1192{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
1193{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
1194{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
1195{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
1196{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
1197{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 32, },
1198{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 32, },
1199{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 32, },
1200{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 32, },
1201{ .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 32, },
1202{ .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 32, },
1203{ .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 32, },
1204{ .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 32, },
1205{ .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 32, },
1206{ .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 32, },
1207{ .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 32, },
1208{ .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 32, },
1209{ .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 32, },
1210{ .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 32, },
1211{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, },
1212{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1213{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1214};
550a7375
FB		 1215
1216/*
1217 * configure a fifo; for non-shared endpoints, this may be called
1218 * once for a tx fifo and once for an rx fifo.
1219 *
1220 * returns negative errno or offset for next fifo.
1221 */
41ac7b3a 1222static int
550a7375 1223fifo_setup(struct musb *musb, struct musb_hw_ep *hw_ep,
e6c213b2 1224 const struct musb_fifo_cfg *cfg, u16 offset)
550a7375
FB		 1225{
1226 void __iomem *mbase = musb->mregs;
1227 int size = 0;
1228 u16 maxpacket = cfg->maxpacket;
1229 u16 c_off = offset >> 3;
1230 u8 c_size;
1231
1232 /* expect hw_ep has already been zero-initialized */
1233
1234 size = ffs(max(maxpacket, (u16) 8)) - 1;
1235 maxpacket = 1 << size;
1236
1237 c_size = size - 3;
1238 if (cfg->mode == BUF_DOUBLE) {
ca6d1b13
FB		 1239 if ((offset + (maxpacket << 1)) >
1240 (1 << (musb->config->ram_bits + 2)))
550a7375
FB		 1241 return -EMSGSIZE;
1242 c_size |= MUSB_FIFOSZ_DPB;
1243 } else {
ca6d1b13 1244 if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2)))
550a7375
FB		 1245 return -EMSGSIZE;
1246 }
1247
1248 /* configure the FIFO */
1249 musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum);
1250
550a7375 1251 /* EP0 reserved endpoint for control, bidirectional;
5ae477b0 1252 * EP1 reserved for bulk, two unidirectional halves.
550a7375
FB		 1253 */
1254 if (hw_ep->epnum == 1)
1255 musb->bulk_ep = hw_ep;
1256 /* REVISIT error check: be sure ep0 can both rx and tx ... */
550a7375
FB		 1257 switch (cfg->style) {
1258 case FIFO_TX:
c6cf8b00
BW		 1259 musb_write_txfifosz(mbase, c_size);
1260 musb_write_txfifoadd(mbase, c_off);
550a7375
FB		 1261 hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1262 hw_ep->max_packet_sz_tx = maxpacket;
1263 break;
1264 case FIFO_RX:
c6cf8b00
BW		 1265 musb_write_rxfifosz(mbase, c_size);
1266 musb_write_rxfifoadd(mbase, c_off);
550a7375
FB		 1267 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1268 hw_ep->max_packet_sz_rx = maxpacket;
1269 break;
1270 case FIFO_RXTX:
c6cf8b00
BW		 1271 musb_write_txfifosz(mbase, c_size);
1272 musb_write_txfifoadd(mbase, c_off);
550a7375
FB		 1273 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1274 hw_ep->max_packet_sz_rx = maxpacket;
1275
c6cf8b00
BW		 1276 musb_write_rxfifosz(mbase, c_size);
1277 musb_write_rxfifoadd(mbase, c_off);
550a7375
FB		 1278 hw_ep->tx_double_buffered = hw_ep->rx_double_buffered;
1279 hw_ep->max_packet_sz_tx = maxpacket;
1280
1281 hw_ep->is_shared_fifo = true;
1282 break;
1283 }
1284
1285 /* NOTE rx and tx endpoint irqs aren't managed separately,
1286 * which happens to be ok
1287 */
1288 musb->epmask |= (1 << hw_ep->epnum);
1289
1290 return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0));
1291}
1292
d3608b6d 1293static struct musb_fifo_cfg ep0_cfg = {
550a7375
FB		 1294 .style = FIFO_RXTX, .maxpacket = 64,
1295};
1296
41ac7b3a 1297static int ep_config_from_table(struct musb *musb)
550a7375 1298{
e6c213b2 1299 const struct musb_fifo_cfg *cfg;
550a7375
FB		 1300 unsigned i, n;
1301 int offset;
1302 struct musb_hw_ep *hw_ep = musb->endpoints;
1303
e6c213b2
FB		 1304 if (musb->config->fifo_cfg) {
1305 cfg = musb->config->fifo_cfg;
1306 n = musb->config->fifo_cfg_size;
1307 goto done;
1308 }
1309
550a7375
FB		 1310 switch (fifo_mode) {
1311 default:
1312 fifo_mode = 0;
1313 /* FALLTHROUGH */
1314 case 0:
1315 cfg = mode_0_cfg;
1316 n = ARRAY_SIZE(mode_0_cfg);
1317 break;
1318 case 1:
1319 cfg = mode_1_cfg;
1320 n = ARRAY_SIZE(mode_1_cfg);
1321 break;
1322 case 2:
1323 cfg = mode_2_cfg;
1324 n = ARRAY_SIZE(mode_2_cfg);
1325 break;
1326 case 3:
1327 cfg = mode_3_cfg;
1328 n = ARRAY_SIZE(mode_3_cfg);
1329 break;
1330 case 4:
1331 cfg = mode_4_cfg;
1332 n = ARRAY_SIZE(mode_4_cfg);
1333 break;
3b151526
AKG		 1334 case 5:
1335 cfg = mode_5_cfg;
1336 n = ARRAY_SIZE(mode_5_cfg);
1337 break;
550a7375
FB		 1338 }
1339
3ff4b573 1340 pr_debug("%s: setup fifo_mode %d\n", musb_driver_name, fifo_mode);
550a7375
FB		 1341
1342
e6c213b2 1343done:
550a7375
FB		 1344 offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0);
1345 /* assert(offset > 0) */
1346
1347 /* NOTE: for RTL versions >= 1.400 EPINFO and RAMINFO would
ca6d1b13 1348 * be better than static musb->config->num_eps and DYN_FIFO_SIZE...
550a7375
FB		 1349 */
1350
1351 for (i = 0; i < n; i++) {
1352 u8 epn = cfg->hw_ep_num;
1353
ca6d1b13 1354 if (epn >= musb->config->num_eps) {
550a7375
FB		 1355 pr_debug("%s: invalid ep %d\n",
1356 musb_driver_name, epn);
bb1c9ef1 1357 return -EINVAL;
550a7375
FB		 1358 }
1359 offset = fifo_setup(musb, hw_ep + epn, cfg++, offset);
1360 if (offset < 0) {
1361 pr_debug("%s: mem overrun, ep %d\n",
1362 musb_driver_name, epn);
f69dfa1f 1363 return offset;
550a7375
FB		 1364 }
1365 epn++;
1366 musb->nr_endpoints = max(epn, musb->nr_endpoints);
1367 }
1368
3ff4b573 1369 pr_debug("%s: %d/%d max ep, %d/%d memory\n",
550a7375 1370 musb_driver_name,
ca6d1b13
FB		 1371 n + 1, musb->config->num_eps * 2 - 1,
1372 offset, (1 << (musb->config->ram_bits + 2)));
550a7375 1373
550a7375
FB		 1374 if (!musb->bulk_ep) {
1375 pr_debug("%s: missing bulk\n", musb_driver_name);
1376 return -EINVAL;
1377 }
550a7375
FB		 1378
1379 return 0;
1380}
1381
1382
1383/*
1384 * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false
1385 * @param musb the controller
1386 */
41ac7b3a 1387static int ep_config_from_hw(struct musb *musb)
550a7375 1388{
c6cf8b00 1389 u8 epnum = 0;
550a7375 1390 struct musb_hw_ep *hw_ep;
a156544b 1391 void __iomem *mbase = musb->mregs;
c6cf8b00 1392 int ret = 0;
550a7375 1393
5c8a86e1 1394 dev_dbg(musb->controller, "<== static silicon ep config\n");
550a7375
FB		 1395
1396 /* FIXME pick up ep0 maxpacket size */
1397
ca6d1b13 1398 for (epnum = 1; epnum < musb->config->num_eps; epnum++) {
550a7375
FB		 1399 musb_ep_select(mbase, epnum);
1400 hw_ep = musb->endpoints + epnum;
1401
c6cf8b00
BW		 1402 ret = musb_read_fifosize(musb, hw_ep, epnum);
1403 if (ret < 0)
550a7375 1404 break;
550a7375
FB		 1405
1406 /* FIXME set up hw_ep->{rx,tx}_double_buffered */
1407
550a7375
FB		 1408 /* pick an RX/TX endpoint for bulk */
1409 if (hw_ep->max_packet_sz_tx < 512
1410 || hw_ep->max_packet_sz_rx < 512)
1411 continue;
1412
1413 /* REVISIT: this algorithm is lazy, we should at least
1414 * try to pick a double buffered endpoint.
1415 */
1416 if (musb->bulk_ep)
1417 continue;
1418 musb->bulk_ep = hw_ep;
550a7375
FB		 1419 }
1420
550a7375
FB		 1421 if (!musb->bulk_ep) {
1422 pr_debug("%s: missing bulk\n", musb_driver_name);
1423 return -EINVAL;
1424 }
550a7375
FB		 1425
1426 return 0;
1427}
1428
1429enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, };
1430
1431/* Initialize MUSB (M)HDRC part of the USB hardware subsystem;
1432 * configure endpoints, or take their config from silicon
1433 */
41ac7b3a 1434static int musb_core_init(u16 musb_type, struct musb *musb)
550a7375 1435{
550a7375
FB		 1436 u8 reg;
1437 char *type;
0ea52ff4 1438 char aInfo[90], aRevision[32], aDate[12];
550a7375
FB		 1439 void __iomem *mbase = musb->mregs;
1440 int status = 0;
1441 int i;
1442
1443 /* log core options (read using indexed model) */
c6cf8b00 1444 reg = musb_read_configdata(mbase);
550a7375
FB		 1445
1446 strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8");
51bf0d0e 1447 if (reg & MUSB_CONFIGDATA_DYNFIFO) {
550a7375 1448 strcat(aInfo, ", dyn FIFOs");
51bf0d0e
AKG		 1449 musb->dyn_fifo = true;
1450 }
550a7375
FB		 1451 if (reg & MUSB_CONFIGDATA_MPRXE) {
1452 strcat(aInfo, ", bulk combine");
550a7375 1453 musb->bulk_combine = true;
550a7375
FB		 1454 }
1455 if (reg & MUSB_CONFIGDATA_MPTXE) {
1456 strcat(aInfo, ", bulk split");
550a7375 1457 musb->bulk_split = true;
550a7375
FB		 1458 }
1459 if (reg & MUSB_CONFIGDATA_HBRXE) {
1460 strcat(aInfo, ", HB-ISO Rx");
a483d706 1461 musb->hb_iso_rx = true;
550a7375
FB		 1462 }
1463 if (reg & MUSB_CONFIGDATA_HBTXE) {
1464 strcat(aInfo, ", HB-ISO Tx");
a483d706 1465 musb->hb_iso_tx = true;
550a7375
FB		 1466 }
1467 if (reg & MUSB_CONFIGDATA_SOFTCONE)
1468 strcat(aInfo, ", SoftConn");
1469
3ff4b573 1470 pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo);
550a7375 1471
550a7375 1472 aDate[0] = 0;
550a7375
FB		 1473 if (MUSB_CONTROLLER_MHDRC == musb_type) {
1474 musb->is_multipoint = 1;
1475 type = "M";
1476 } else {
1477 musb->is_multipoint = 0;
1478 type = "";
550a7375 1479#ifndef CONFIG_USB_OTG_BLACKLIST_HUB
3ff4b573
RV		 1480 pr_err("%s: kernel must blacklist external hubs\n",
1481 musb_driver_name);
550a7375
FB		 1482#endif
1483 }
1484
1485 /* log release info */
32c3b94e
AG		 1486 musb->hwvers = musb_read_hwvers(mbase);
1487 snprintf(aRevision, 32, "%d.%d%s", MUSB_HWVERS_MAJOR(musb->hwvers),
1488 MUSB_HWVERS_MINOR(musb->hwvers),
1489 (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
3ff4b573
RV		 1490 pr_debug("%s: %sHDRC RTL version %s %s\n",
1491 musb_driver_name, type, aRevision, aDate);
550a7375
FB		 1492
1493 /* configure ep0 */
c6cf8b00 1494 musb_configure_ep0(musb);
550a7375
FB		 1495
1496 /* discover endpoint configuration */
1497 musb->nr_endpoints = 1;
1498 musb->epmask = 1;
1499
ad517e9e
FB		 1500 if (musb->dyn_fifo)
1501 status = ep_config_from_table(musb);
1502 else
1503 status = ep_config_from_hw(musb);
550a7375
FB		 1504
1505 if (status < 0)
1506 return status;
1507
1508 /* finish init, and print endpoint config */
1509 for (i = 0; i < musb->nr_endpoints; i++) {
1510 struct musb_hw_ep *hw_ep = musb->endpoints + i;
1511
1b40fc57 1512 hw_ep->fifo = musb->io.fifo_offset(i) + mbase;
ebf39920 1513#if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
1b40fc57
TL		 1514 if (musb->io.quirks & MUSB_IN_TUSB) {
1515 hw_ep->fifo_async = musb->async + 0x400 +
1516 musb->io.fifo_offset(i);
1517 hw_ep->fifo_sync = musb->sync + 0x400 +
1518 musb->io.fifo_offset(i);
1519 hw_ep->fifo_sync_va =
1520 musb->sync_va + 0x400 + musb->io.fifo_offset(i);
1521
1522 if (i == 0)
1523 hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF;
1524 else
1525 hw_ep->conf = mbase + 0x400 +
1526 (((i - 1) & 0xf) << 2);
1527 }
550a7375
FB		 1528#endif
1529
d026e9c7 1530 hw_ep->regs = musb->io.ep_offset(i, 0) + mbase;
550a7375
FB		 1531 hw_ep->rx_reinit = 1;
1532 hw_ep->tx_reinit = 1;
550a7375
FB		 1533
1534 if (hw_ep->max_packet_sz_tx) {
5c8a86e1 1535 dev_dbg(musb->controller,
550a7375
FB		 1536 "%s: hw_ep %d%s, %smax %d\n",
1537 musb_driver_name, i,
1538 hw_ep->is_shared_fifo ? "shared" : "tx",
1539 hw_ep->tx_double_buffered
1540 ? "doublebuffer, " : "",
1541 hw_ep->max_packet_sz_tx);
1542 }
1543 if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) {
5c8a86e1 1544 dev_dbg(musb->controller,
550a7375
FB		 1545 "%s: hw_ep %d%s, %smax %d\n",
1546 musb_driver_name, i,
1547 "rx",
1548 hw_ep->rx_double_buffered
1549 ? "doublebuffer, " : "",
1550 hw_ep->max_packet_sz_rx);
1551 }
1552 if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx))
5c8a86e1 1553 dev_dbg(musb->controller, "hw_ep %d not configured\n", i);
550a7375
FB		 1554 }
1555
1556 return 0;
1557}
1558
1559/*-------------------------------------------------------------------------*/
1560
550a7375
FB		 1561/*
1562 * handle all the irqs defined by the HDRC core. for now we expect: other
1563 * irq sources (phy, dma, etc) will be handled first, musb->int_* values
1564 * will be assigned, and the irq will already have been acked.
1565 *
1566 * called in irq context with spinlock held, irqs blocked
1567 */
1568irqreturn_t musb_interrupt(struct musb *musb)
1569{
1570 irqreturn_t retval = IRQ_NONE;
31a0ede0
FB		 1571 unsigned long status;
1572 unsigned long epnum;
b11e94d0 1573 u8 devctl;
31a0ede0
FB		 1574
1575 if (!musb->int_usb && !musb->int_tx && !musb->int_rx)
1576 return IRQ_NONE;
550a7375
FB		 1577
1578 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
550a7375 1579
5c8a86e1 1580 dev_dbg(musb->controller, "** IRQ %s usb%04x tx%04x rx%04x\n",
c03da38d 1581 is_host_active(musb) ? "host" : "peripheral",
550a7375
FB		 1582 musb->int_usb, musb->int_tx, musb->int_rx);
1583
e3c93e1a
FB		 1584 /**
1585 * According to Mentor Graphics' documentation, flowchart on page 98,
1586 * IRQ should be handled as follows:
1587 *
1588 * . Resume IRQ
1589 * . Session Request IRQ
1590 * . VBUS Error IRQ
1591 * . Suspend IRQ
1592 * . Connect IRQ
1593 * . Disconnect IRQ
1594 * . Reset/Babble IRQ
1595 * . SOF IRQ (we're not using this one)
1596 * . Endpoint 0 IRQ
1597 * . TX Endpoints
1598 * . RX Endpoints
1599 *
1600 * We will be following that flowchart in order to avoid any problems
1601 * that might arise with internal Finite State Machine.
550a7375 1602 */
e3c93e1a 1603
7d9645fd 1604 if (musb->int_usb)
31a0ede0 1605 retval |= musb_stage0_irq(musb, musb->int_usb, devctl);
550a7375 1606
550a7375 1607 if (musb->int_tx & 1) {
c03da38d 1608 if (is_host_active(musb))
550a7375
FB		 1609 retval |= musb_h_ep0_irq(musb);
1610 else
1611 retval |= musb_g_ep0_irq(musb);
31a0ede0
FB		 1612
1613 /* we have just handled endpoint 0 IRQ, clear it */
1614 musb->int_tx &= ~BIT(0);
550a7375
FB		 1615 }
1616
31a0ede0
FB		 1617 status = musb->int_tx;
1618
1619 for_each_set_bit(epnum, &status, 16) {
1620 retval = IRQ_HANDLED;
1621 if (is_host_active(musb))
1622 musb_host_tx(musb, epnum);
1623 else
1624 musb_g_tx(musb, epnum);
550a7375
FB		 1625 }
1626
31a0ede0 1627 status = musb->int_rx;
e3c93e1a 1628
31a0ede0
FB		 1629 for_each_set_bit(epnum, &status, 16) {
1630 retval = IRQ_HANDLED;
1631 if (is_host_active(musb))
1632 musb_host_rx(musb, epnum);
1633 else
1634 musb_g_rx(musb, epnum);
550a7375
FB		 1635 }
1636
550a7375
FB		 1637 return retval;
1638}
981430a1 1639EXPORT_SYMBOL_GPL(musb_interrupt);
550a7375
FB		 1640
1641#ifndef CONFIG_MUSB_PIO_ONLY
d3608b6d 1642static bool use_dma = 1;
550a7375
FB		 1643
1644/* "modprobe ... use_dma=0" etc */
51676c8d 1645module_param(use_dma, bool, 0644);
550a7375
FB		 1646MODULE_PARM_DESC(use_dma, "enable/disable use of DMA");
1647
1648void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit)
1649{
550a7375
FB		 1650 /* called with controller lock already held */
1651
1652 if (!epnum) {
f8e9f34f 1653 if (!is_cppi_enabled(musb)) {
550a7375 1654 /* endpoint 0 */
c03da38d 1655 if (is_host_active(musb))
550a7375
FB		 1656 musb_h_ep0_irq(musb);
1657 else
1658 musb_g_ep0_irq(musb);
1659 }
550a7375
FB		 1660 } else {
1661 /* endpoints 1..15 */
1662 if (transmit) {
c03da38d 1663 if (is_host_active(musb))
a04d46d0
FB		 1664 musb_host_tx(musb, epnum);
1665 else
1666 musb_g_tx(musb, epnum);
550a7375
FB		 1667 } else {
1668 /* receive */
c03da38d 1669 if (is_host_active(musb))
a04d46d0
FB		 1670 musb_host_rx(musb, epnum);
1671 else
1672 musb_g_rx(musb, epnum);
550a7375
FB		 1673 }
1674 }
1675}
9a35f876 1676EXPORT_SYMBOL_GPL(musb_dma_completion);
550a7375
FB		 1677
1678#else
1679#define use_dma 0
1680#endif
1681
8055555f
TL		 1682static void (*musb_phy_callback)(enum musb_vbus_id_status status);
1683
1684/*
1685 * musb_mailbox - optional phy notifier function
1686 * @status phy state change
1687 *
1688 * Optionally gets called from the USB PHY. Note that the USB PHY must be
1689 * disabled at the point the phy_callback is registered or unregistered.
1690 */
1691void musb_mailbox(enum musb_vbus_id_status status)
1692{
1693 if (musb_phy_callback)
1694 musb_phy_callback(status);
1695
1696};
1697EXPORT_SYMBOL_GPL(musb_mailbox);
1698
550a7375
FB		 1699/*-------------------------------------------------------------------------*/
1700
550a7375
FB		 1701static ssize_t
1702musb_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
1703{
1704 struct musb *musb = dev_to_musb(dev);
1705 unsigned long flags;
1706 int ret = -EINVAL;
1707
1708 spin_lock_irqsave(&musb->lock, flags);
e47d9254 1709 ret = sprintf(buf, "%s\n", usb_otg_state_string(musb->xceiv->otg->state));
550a7375
FB		 1710 spin_unlock_irqrestore(&musb->lock, flags);
1711
1712 return ret;
1713}
1714
1715static ssize_t
1716musb_mode_store(struct device *dev, struct device_attribute *attr,
1717 const char *buf, size_t n)
1718{
1719 struct musb *musb = dev_to_musb(dev);
1720 unsigned long flags;
96a274d1 1721 int status;
550a7375
FB		 1722
1723 spin_lock_irqsave(&musb->lock, flags);
96a274d1
DB		 1724 if (sysfs_streq(buf, "host"))
1725 status = musb_platform_set_mode(musb, MUSB_HOST);
1726 else if (sysfs_streq(buf, "peripheral"))
1727 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
1728 else if (sysfs_streq(buf, "otg"))
1729 status = musb_platform_set_mode(musb, MUSB_OTG);
1730 else
1731 status = -EINVAL;
550a7375
FB		 1732 spin_unlock_irqrestore(&musb->lock, flags);
1733
96a274d1 1734 return (status == 0) ? n : status;
550a7375
FB		 1735}
1736static DEVICE_ATTR(mode, 0644, musb_mode_show, musb_mode_store);
1737
1738static ssize_t
1739musb_vbus_store(struct device *dev, struct device_attribute *attr,
1740 const char *buf, size_t n)
1741{
1742 struct musb *musb = dev_to_musb(dev);
1743 unsigned long flags;
1744 unsigned long val;
1745
1746 if (sscanf(buf, "%lu", &val) < 1) {
b3b1cc3b 1747 dev_err(dev, "Invalid VBUS timeout ms value\n");
550a7375
FB		 1748 return -EINVAL;
1749 }
1750
1751 spin_lock_irqsave(&musb->lock, flags);
f7f9d63e
DB		 1752 /* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
1753 musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
e47d9254 1754 if (musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)
550a7375
FB		 1755 musb->is_active = 0;
1756 musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
1757 spin_unlock_irqrestore(&musb->lock, flags);
1758
1759 return n;
1760}
1761
1762static ssize_t
1763musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
1764{
1765 struct musb *musb = dev_to_musb(dev);
1766 unsigned long flags;
1767 unsigned long val;
1768 int vbus;
3bbafac8 1769 u8 devctl;
550a7375
FB		 1770
1771 spin_lock_irqsave(&musb->lock, flags);
1772 val = musb->a_wait_bcon;
1773 vbus = musb_platform_get_vbus_status(musb);
3bbafac8
RA		 1774 if (vbus < 0) {
1775 /* Use default MUSB method by means of DEVCTL register */
1776 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1777 if ((devctl & MUSB_DEVCTL_VBUS)
1778 == (3 << MUSB_DEVCTL_VBUS_SHIFT))
1779 vbus = 1;
1780 else
1781 vbus = 0;
1782 }
550a7375
FB		 1783 spin_unlock_irqrestore(&musb->lock, flags);
1784
f7f9d63e 1785 return sprintf(buf, "Vbus %s, timeout %lu msec\n",
550a7375
FB		 1786 vbus ? "on" : "off", val);
1787}
1788static DEVICE_ATTR(vbus, 0644, musb_vbus_show, musb_vbus_store);
1789
550a7375
FB		 1790/* Gadget drivers can't know that a host is connected so they might want
1791 * to start SRP, but users can. This allows userspace to trigger SRP.
1792 */
1793static ssize_t
1794musb_srp_store(struct device *dev, struct device_attribute *attr,
1795 const char *buf, size_t n)
1796{
1797 struct musb *musb = dev_to_musb(dev);
1798 unsigned short srp;
1799
1800 if (sscanf(buf, "%hu", &srp) != 1
1801 || (srp != 1)) {
b3b1cc3b 1802 dev_err(dev, "SRP: Value must be 1\n");
550a7375
FB		 1803 return -EINVAL;
1804 }
1805
1806 if (srp == 1)
1807 musb_g_wakeup(musb);
1808
1809 return n;
1810}
1811static DEVICE_ATTR(srp, 0644, NULL, musb_srp_store);
1812
94375751
FB		 1813static struct attribute *musb_attributes[] = {
1814 &dev_attr_mode.attr,
1815 &dev_attr_vbus.attr,
94375751 1816 &dev_attr_srp.attr,
94375751
FB		 1817 NULL
1818};
1819
1820static const struct attribute_group musb_attr_group = {
1821 .attrs = musb_attributes,
1822};
1823
550a7375
FB		 1824/* Only used to provide driver mode change events */
1825static void musb_irq_work(struct work_struct *data)
1826{
1827 struct musb *musb = container_of(data, struct musb, irq_work);
550a7375 1828
e47d9254
AT		 1829 if (musb->xceiv->otg->state != musb->xceiv_old_state) {
1830 musb->xceiv_old_state = musb->xceiv->otg->state;
550a7375
FB		 1831 sysfs_notify(&musb->controller->kobj, NULL, "mode");
1832 }
1833}
1834
83b8f5b8 1835static void musb_recover_from_babble(struct musb *musb)
ca88fc2e 1836{
b4dc38fd
FB		 1837 int ret;
1838 u8 devctl;
ca88fc2e 1839
0244336f
FB		 1840 musb_disable_interrupts(musb);
1841
83b8f5b8
FB		 1842 /*
1843 * wait at least 320 cycles of 60MHz clock. That's 5.3us, we will give
1844 * it some slack and wait for 10us.
1845 */
1846 udelay(10);
1847
b28a6432 1848 ret = musb_platform_recover(musb);
ba7ee8bb
FB		 1849 if (ret) {
1850 musb_enable_interrupts(musb);
d871c622 1851 return;
ba7ee8bb 1852 }
ca88fc2e 1853
b4dc38fd
FB		 1854 /* drop session bit */
1855 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1856 devctl &= ~MUSB_DEVCTL_SESSION;
1857 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
ca88fc2e 1858
b4dc38fd
FB		 1859 /* tell usbcore about it */
1860 musb_root_disconnect(musb);
ca88fc2e
DM		 1861
1862 /*
d871c622
GC		 1863 * When a babble condition occurs, the musb controller
1864 * removes the session bit and the endpoint config is lost.
ca88fc2e
DM		 1865 */
1866 if (musb->dyn_fifo)
b4dc38fd 1867 ret = ep_config_from_table(musb);
ca88fc2e 1868 else
b4dc38fd 1869 ret = ep_config_from_hw(musb);
ca88fc2e 1870
b4dc38fd
FB		 1871 /* restart session */
1872 if (ret == 0)
ca88fc2e
DM		 1873 musb_start(musb);
1874}
1875
550a7375
FB		 1876/* --------------------------------------------------------------------------
1877 * Init support
1878 */
1879
41ac7b3a 1880static struct musb *allocate_instance(struct device *dev,
ead22caf 1881 const struct musb_hdrc_config *config, void __iomem *mbase)
550a7375
FB		 1882{
1883 struct musb *musb;
1884 struct musb_hw_ep *ep;
1885 int epnum;
74c2e936 1886 int ret;
550a7375 1887
74c2e936
DM		 1888 musb = devm_kzalloc(dev, sizeof(*musb), GFP_KERNEL);
1889 if (!musb)
550a7375 1890 return NULL;
550a7375 1891
550a7375
FB		 1892 INIT_LIST_HEAD(&musb->control);
1893 INIT_LIST_HEAD(&musb->in_bulk);
1894 INIT_LIST_HEAD(&musb->out_bulk);
1895
550a7375 1896 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
f7f9d63e 1897 musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON;
550a7375
FB		 1898 musb->mregs = mbase;
1899 musb->ctrl_base = mbase;
1900 musb->nIrq = -ENODEV;
ca6d1b13 1901 musb->config = config;
02582b92 1902 BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS);
550a7375 1903 for (epnum = 0, ep = musb->endpoints;
ca6d1b13 1904 epnum < musb->config->num_eps;
550a7375 1905 epnum++, ep++) {
550a7375
FB		 1906 ep->musb = musb;
1907 ep->epnum = epnum;
1908 }
1909
1910 musb->controller = dev;
743411b3 1911
74c2e936
DM		 1912 ret = musb_host_alloc(musb);
1913 if (ret < 0)
1914 goto err_free;
1915
1916 dev_set_drvdata(dev, musb);
1917
550a7375 1918 return musb;
74c2e936
DM		 1919
1920err_free:
1921 return NULL;
550a7375
FB		 1922}
1923
1924static void musb_free(struct musb *musb)
1925{
1926 /* this has multiple entry modes. it handles fault cleanup after
1927 * probe(), where things may be partially set up, as well as rmmod
1928 * cleanup after everything's been de-activated.
1929 */
1930
1931#ifdef CONFIG_SYSFS
94375751 1932 sysfs_remove_group(&musb->controller->kobj, &musb_attr_group);
550a7375
FB		 1933#endif
1934
97a39896
AKG		 1935 if (musb->nIrq >= 0) {
1936 if (musb->irq_wake)
1937 disable_irq_wake(musb->nIrq);
550a7375
FB		 1938 free_irq(musb->nIrq, musb);
1939 }
550a7375 1940
74c2e936 1941 musb_host_free(musb);
550a7375
FB		 1942}
1943
8ed1fb79
DM		 1944static void musb_deassert_reset(struct work_struct *work)
1945{
1946 struct musb *musb;
1947 unsigned long flags;
1948
1949 musb = container_of(work, struct musb, deassert_reset_work.work);
1950
1951 spin_lock_irqsave(&musb->lock, flags);
1952
1953 if (musb->port1_status & USB_PORT_STAT_RESET)
1954 musb_port_reset(musb, false);
1955
1956 spin_unlock_irqrestore(&musb->lock, flags);
1957}
1958
550a7375
FB		 1959/*
1960 * Perform generic per-controller initialization.
1961 *
28dd924a
SS		 1962 * @dev: the controller (already clocked, etc)
1963 * @nIrq: IRQ number
1964 * @ctrl: virtual address of controller registers,
550a7375
FB		 1965 * not yet corrected for platform-specific offsets
1966 */
41ac7b3a 1967static int
550a7375
FB		 1968musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
1969{
1970 int status;
1971 struct musb *musb;
c1a7d67c 1972 struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
550a7375
FB		 1973
1974 /* The driver might handle more features than the board; OK.
1975 * Fail when the board needs a feature that's not enabled.
1976 */
1977 if (!plat) {
1978 dev_dbg(dev, "no platform_data?\n");
34e2beb2
SS		 1979 status = -ENODEV;
1980 goto fail0;
550a7375 1981 }
34e2beb2 1982
550a7375 1983 /* allocate */
ca6d1b13 1984 musb = allocate_instance(dev, plat->config, ctrl);
34e2beb2
SS		 1985 if (!musb) {
1986 status = -ENOMEM;
1987 goto fail0;
1988 }
550a7375
FB		 1989
1990 spin_lock_init(&musb->lock);
550a7375 1991 musb->board_set_power = plat->set_power;
550a7375 1992 musb->min_power = plat->min_power;
f7ec9437 1993 musb->ops = plat->platform_ops;
9ad96e69 1994 musb->port_mode = plat->mode;
550a7375 1995
1b40fc57
TL		 1996 /*
1997 * Initialize the default IO functions. At least omap2430 needs
1998 * these early. We initialize the platform specific IO functions
1999 * later on.
2000 */
2001 musb_readb = musb_default_readb;
2002 musb_writeb = musb_default_writeb;
2003 musb_readw = musb_default_readw;
2004 musb_writew = musb_default_writew;
2005 musb_readl = musb_default_readl;
2006 musb_writel = musb_default_writel;
2007
84e250ff 2008 /* The musb_platform_init() call:
baef653a
PDS		 2009 * - adjusts musb->mregs
2010 * - sets the musb->isr
5ae477b0 2011 * - may initialize an integrated transceiver
721002ec 2012 * - initializes musb->xceiv, usually by otg_get_phy()
84e250ff 2013 * - stops powering VBUS
84e250ff 2014 *
7c9d440e 2015 * There are various transceiver configurations. Blackfin,
84e250ff
DB		 2016 * DaVinci, TUSB60x0, and others integrate them. OMAP3 uses
2017 * external/discrete ones in various flavors (twl4030 family,
2018 * isp1504, non-OTG, etc) mostly hooking up through ULPI.
550a7375 2019 */
ea65df57 2020 status = musb_platform_init(musb);
550a7375 2021 if (status < 0)
03491761 2022 goto fail1;
34e2beb2 2023
550a7375
FB		 2024 if (!musb->isr) {
2025 status = -ENODEV;
c04352a5 2026 goto fail2;
550a7375
FB		 2027 }
2028
1b40fc57
TL		 2029 if (musb->ops->quirks)
2030 musb->io.quirks = musb->ops->quirks;
2031
da96cfc1 2032 /* Most devices use indexed offset or flat offset */
d026e9c7
TL		 2033 if (musb->io.quirks & MUSB_INDEXED_EP) {
2034 musb->io.ep_offset = musb_indexed_ep_offset;
2035 musb->io.ep_select = musb_indexed_ep_select;
2036 } else {
2037 musb->io.ep_offset = musb_flat_ep_offset;
2038 musb->io.ep_select = musb_flat_ep_select;
2039 }
47a82730
HG		 2040 /* And override them with platform specific ops if specified. */
2041 if (musb->ops->ep_offset)
2042 musb->io.ep_offset = musb->ops->ep_offset;
2043 if (musb->ops->ep_select)
2044 musb->io.ep_select = musb->ops->ep_select;
d026e9c7 2045
da96cfc1
BH		 2046 /* At least tusb6010 has its own offsets */
2047 if (musb->ops->ep_offset)
2048 musb->io.ep_offset = musb->ops->ep_offset;
2049 if (musb->ops->ep_select)
2050 musb->io.ep_select = musb->ops->ep_select;
2051
8a77f05a
TL		 2052 if (musb->ops->fifo_mode)
2053 fifo_mode = musb->ops->fifo_mode;
2054 else
2055 fifo_mode = 4;
2056
1b40fc57
TL		 2057 if (musb->ops->fifo_offset)
2058 musb->io.fifo_offset = musb->ops->fifo_offset;
2059 else
2060 musb->io.fifo_offset = musb_default_fifo_offset;
2061
6cc2af6d
HG		 2062 if (musb->ops->busctl_offset)
2063 musb->io.busctl_offset = musb->ops->busctl_offset;
2064 else
2065 musb->io.busctl_offset = musb_default_busctl_offset;
2066
1b40fc57
TL		 2067 if (musb->ops->readb)
2068 musb_readb = musb->ops->readb;
2069 if (musb->ops->writeb)
2070 musb_writeb = musb->ops->writeb;
2071 if (musb->ops->readw)
2072 musb_readw = musb->ops->readw;
2073 if (musb->ops->writew)
2074 musb_writew = musb->ops->writew;
2075 if (musb->ops->readl)
2076 musb_readl = musb->ops->readl;
2077 if (musb->ops->writel)
2078 musb_writel = musb->ops->writel;
2079
7f6283ed
TL		 2080#ifndef CONFIG_MUSB_PIO_ONLY
2081 if (!musb->ops->dma_init || !musb->ops->dma_exit) {
2082 dev_err(dev, "DMA controller not set\n");
7d32cdef 2083 status = -ENODEV;
7f6283ed
TL		 2084 goto fail2;
2085 }
2086 musb_dma_controller_create = musb->ops->dma_init;
2087 musb_dma_controller_destroy = musb->ops->dma_exit;
2088#endif
2089
1b40fc57
TL		 2090 if (musb->ops->read_fifo)
2091 musb->io.read_fifo = musb->ops->read_fifo;
2092 else
2093 musb->io.read_fifo = musb_default_read_fifo;
2094
2095 if (musb->ops->write_fifo)
2096 musb->io.write_fifo = musb->ops->write_fifo;
2097 else
2098 musb->io.write_fifo = musb_default_write_fifo;
2099
ffb865b1 2100 if (!musb->xceiv->io_ops) {
bf070bc1 2101 musb->xceiv->io_dev = musb->controller;
ffb865b1
HK		 2102 musb->xceiv->io_priv = musb->mregs;
2103 musb->xceiv->io_ops = &musb_ulpi_access;
2104 }
2105
8055555f
TL		 2106 if (musb->ops->phy_callback)
2107 musb_phy_callback = musb->ops->phy_callback;
2108
f730f205
TL		 2109 /*
2110 * We need musb_read/write functions initialized for PM.
2111 * Note that at least 2430 glue needs autosuspend delay
2112 * somewhere above 300 ms for the hardware to idle properly
2113 * after disconnecting the cable in host mode. Let's use
2114 * 500 ms for some margin.
2115 */
2116 pm_runtime_use_autosuspend(musb->controller);
2117 pm_runtime_set_autosuspend_delay(musb->controller, 500);
2118 pm_runtime_enable(musb->controller);
c04352a5
GI		 2119 pm_runtime_get_sync(musb->controller);
2120
39cee200
UKK		 2121 status = usb_phy_init(musb->xceiv);
2122 if (status < 0)
2123 goto err_usb_phy_init;
2124
48054147 2125 if (use_dma && dev->dma_mask) {
7f6283ed
TL		 2126 musb->dma_controller =
2127 musb_dma_controller_create(musb, musb->mregs);
48054147
SAS		 2128 if (IS_ERR(musb->dma_controller)) {
2129 status = PTR_ERR(musb->dma_controller);
2130 goto fail2_5;
2131 }
2132 }
550a7375
FB		 2133
2134 /* be sure interrupts are disabled before connecting ISR */
2135 musb_platform_disable(musb);
2136 musb_generic_disable(musb);
2137
66fadea5
SAS		 2138 /* Init IRQ workqueue before request_irq */
2139 INIT_WORK(&musb->irq_work, musb_irq_work);
8ed1fb79
DM		 2140 INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
2141 INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume);
66fadea5 2142
550a7375 2143 /* setup musb parts of the core (especially endpoints) */
ca6d1b13 2144 status = musb_core_init(plat->config->multipoint
550a7375
FB		 2145 ? MUSB_CONTROLLER_MHDRC
2146 : MUSB_CONTROLLER_HDRC, musb);
2147 if (status < 0)
34e2beb2 2148 goto fail3;
550a7375 2149
f7f9d63e 2150 setup_timer(&musb->otg_timer, musb_otg_timer_func, (unsigned long) musb);
f7f9d63e 2151
550a7375 2152 /* attach to the IRQ */
427c4f33 2153 if (request_irq(nIrq, musb->isr, 0, dev_name(dev), musb)) {
550a7375
FB		 2154 dev_err(dev, "request_irq %d failed!\n", nIrq);
2155 status = -ENODEV;
34e2beb2 2156 goto fail3;
550a7375
FB		 2157 }
2158 musb->nIrq = nIrq;
032ec49f 2159 /* FIXME this handles wakeup irqs wrong */
c48a5155
FB		 2160 if (enable_irq_wake(nIrq) == 0) {
2161 musb->irq_wake = 1;
550a7375 2162 device_init_wakeup(dev, 1);
c48a5155
FB		 2163 } else {
2164 musb->irq_wake = 0;
2165 }
550a7375 2166
032ec49f
FB		 2167 /* program PHY to use external vBus if required */
2168 if (plat->extvbus) {
2169 u8 busctl = musb_read_ulpi_buscontrol(musb->mregs);
2170 busctl |= MUSB_ULPI_USE_EXTVBUS;
2171 musb_write_ulpi_buscontrol(musb->mregs, busctl);
550a7375 2172 }
550a7375 2173
e5615112
GI		 2174 if (musb->xceiv->otg->default_a) {
2175 MUSB_HST_MODE(musb);
e47d9254 2176 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
e5615112
GI		 2177 } else {
2178 MUSB_DEV_MODE(musb);
e47d9254 2179 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
e5615112 2180 }
550a7375 2181
6c5f6a6f
DM		 2182 switch (musb->port_mode) {
2183 case MUSB_PORT_MODE_HOST:
2184 status = musb_host_setup(musb, plat->power);
2df6761e
FB		 2185 if (status < 0)
2186 goto fail3;
2187 status = musb_platform_set_mode(musb, MUSB_HOST);
6c5f6a6f
DM		 2188 break;
2189 case MUSB_PORT_MODE_GADGET:
2190 status = musb_gadget_setup(musb);
2df6761e
FB		 2191 if (status < 0)
2192 goto fail3;
2193 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
6c5f6a6f
DM		 2194 break;
2195 case MUSB_PORT_MODE_DUAL_ROLE:
2196 status = musb_host_setup(musb, plat->power);
2197 if (status < 0)
2198 goto fail3;
2199 status = musb_gadget_setup(musb);
2df6761e 2200 if (status) {
0d2dd7ea 2201 musb_host_cleanup(musb);
2df6761e
FB		 2202 goto fail3;
2203 }
2204 status = musb_platform_set_mode(musb, MUSB_OTG);
6c5f6a6f
DM		 2205 break;
2206 default:
2207 dev_err(dev, "unsupported port mode %d\n", musb->port_mode);
2208 break;
2209 }
550a7375 2210
461972d8 2211 if (status < 0)
34e2beb2 2212 goto fail3;
550a7375 2213
7f7f9e2a
FB		 2214 status = musb_init_debugfs(musb);
2215 if (status < 0)
b0f9da7e 2216 goto fail4;
7f7f9e2a 2217
94375751 2218 status = sysfs_create_group(&musb->controller->kobj, &musb_attr_group);
28c2c51c 2219 if (status)
b0f9da7e 2220 goto fail5;
550a7375 2221
7099dbc5
TL		 2222 pm_runtime_mark_last_busy(musb->controller);
2223 pm_runtime_put_autosuspend(musb->controller);
c04352a5 2224
4d055910
TL		 2225 /*
2226 * For why this is currently needed, see commit 3e43a0725637
2227 * ("usb: musb: core: add pm_runtime_irq_safe()")
2228 */
2229 pm_runtime_irq_safe(musb->controller);
2230
28c2c51c 2231 return 0;
550a7375 2232
b0f9da7e
FB		 2233fail5:
2234 musb_exit_debugfs(musb);
2235
34e2beb2 2236fail4:
032ec49f 2237 musb_gadget_cleanup(musb);
0d2dd7ea 2238 musb_host_cleanup(musb);
34e2beb2
SS		 2239
2240fail3:
66fadea5 2241 cancel_work_sync(&musb->irq_work);
8ed1fb79
DM		 2242 cancel_delayed_work_sync(&musb->finish_resume_work);
2243 cancel_delayed_work_sync(&musb->deassert_reset_work);
f3ce4d5b 2244 if (musb->dma_controller)
7f6283ed 2245 musb_dma_controller_destroy(musb->dma_controller);
39cee200 2246
48054147 2247fail2_5:
39cee200
UKK		 2248 usb_phy_shutdown(musb->xceiv);
2249
2250err_usb_phy_init:
7099dbc5 2251 pm_runtime_dont_use_autosuspend(musb->controller);
c04352a5 2252 pm_runtime_put_sync(musb->controller);
f730f205 2253 pm_runtime_disable(musb->controller);
c04352a5
GI		 2254
2255fail2:
34e2beb2
SS		 2256 if (musb->irq_wake)
2257 device_init_wakeup(dev, 0);
550a7375 2258 musb_platform_exit(musb);
28c2c51c 2259
34e2beb2
SS		 2260fail1:
2261 dev_err(musb->controller,
2262 "musb_init_controller failed with status %d\n", status);
2263
28c2c51c
FB		 2264 musb_free(musb);
2265
34e2beb2
SS		 2266fail0:
2267
28c2c51c
FB		 2268 return status;
2269
550a7375
FB		 2270}
2271
2272/*-------------------------------------------------------------------------*/
2273
2274/* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just
2275 * bridge to a platform device; this driver then suffices.
2276 */
41ac7b3a 2277static int musb_probe(struct platform_device *pdev)
550a7375
FB		 2278{
2279 struct device *dev = &pdev->dev;
fcf173e4 2280 int irq = platform_get_irq_byname(pdev, "mc");
550a7375
FB		 2281 struct resource *iomem;
2282 void __iomem *base;
2283
1f79b26c 2284 if (irq <= 0)
550a7375
FB		 2285 return -ENODEV;
2286
1f79b26c 2287 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
b42f7f30
FB		 2288 base = devm_ioremap_resource(dev, iomem);
2289 if (IS_ERR(base))
2290 return PTR_ERR(base);
550a7375 2291
b42f7f30 2292 return musb_init_controller(dev, irq, base);
550a7375
FB		 2293}
2294
fb4e98ab 2295static int musb_remove(struct platform_device *pdev)
550a7375 2296{
8d2421e6
AKG		 2297 struct device *dev = &pdev->dev;
2298 struct musb *musb = dev_to_musb(dev);
302f6802 2299 unsigned long flags;
550a7375
FB		 2300
2301 /* this gets called on rmmod.
2302 * - Host mode: host may still be active
2303 * - Peripheral mode: peripheral is deactivated (or never-activated)
2304 * - OTG mode: both roles are deactivated (or never-activated)
2305 */
7f7f9e2a 2306 musb_exit_debugfs(musb);
302f6802 2307
f730f205
TL		 2308 cancel_work_sync(&musb->irq_work);
2309 cancel_delayed_work_sync(&musb->finish_resume_work);
2310 cancel_delayed_work_sync(&musb->deassert_reset_work);
302f6802
TL		 2311 pm_runtime_get_sync(musb->controller);
2312 musb_host_cleanup(musb);
2313 musb_gadget_cleanup(musb);
2314 spin_lock_irqsave(&musb->lock, flags);
2315 musb_platform_disable(musb);
2316 musb_generic_disable(musb);
2317 spin_unlock_irqrestore(&musb->lock, flags);
2318 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
f730f205
TL		 2319 pm_runtime_dont_use_autosuspend(musb->controller);
2320 pm_runtime_put_sync(musb->controller);
2321 pm_runtime_disable(musb->controller);
302f6802 2322 musb_platform_exit(musb);
8055555f 2323 musb_phy_callback = NULL;
8d1aad74 2324 if (musb->dma_controller)
7f6283ed 2325 musb_dma_controller_destroy(musb->dma_controller);
39cee200 2326 usb_phy_shutdown(musb->xceiv);
550a7375 2327 musb_free(musb);
8d2421e6 2328 device_init_wakeup(dev, 0);
550a7375
FB		 2329 return 0;
2330}
2331
2332#ifdef CONFIG_PM
2333
3c8a5fcc 2334static void musb_save_context(struct musb *musb)
4f712e01
AKG		 2335{
2336 int i;
2337 void __iomem *musb_base = musb->mregs;
ae9b2ad2 2338 void __iomem *epio;
4f712e01 2339
032ec49f
FB		 2340 musb->context.frame = musb_readw(musb_base, MUSB_FRAME);
2341 musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE);
2342 musb->context.busctl = musb_read_ulpi_buscontrol(musb->mregs);
7421107b 2343 musb->context.power = musb_readb(musb_base, MUSB_POWER);
7421107b
FB		 2344 musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE);
2345 musb->context.index = musb_readb(musb_base, MUSB_INDEX);
2346 musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL);
4f712e01 2347
ae9b2ad2 2348 for (i = 0; i < musb->config->num_eps; ++i) {
e4e5b136
FB		 2349 struct musb_hw_ep *hw_ep;
2350
2351 hw_ep = &musb->endpoints[i];
2352 if (!hw_ep)
2353 continue;
2354
2355 epio = hw_ep->regs;
2356 if (!epio)
2357 continue;
2358
ea737554 2359 musb_writeb(musb_base, MUSB_INDEX, i);
7421107b 2360 musb->context.index_regs[i].txmaxp =
ae9b2ad2 2361 musb_readw(epio, MUSB_TXMAXP);
7421107b 2362 musb->context.index_regs[i].txcsr =
ae9b2ad2 2363 musb_readw(epio, MUSB_TXCSR);
7421107b 2364 musb->context.index_regs[i].rxmaxp =
ae9b2ad2 2365 musb_readw(epio, MUSB_RXMAXP);
7421107b 2366 musb->context.index_regs[i].rxcsr =
ae9b2ad2 2367 musb_readw(epio, MUSB_RXCSR);
4f712e01
AKG		 2368
2369 if (musb->dyn_fifo) {
7421107b 2370 musb->context.index_regs[i].txfifoadd =
4f712e01 2371 musb_read_txfifoadd(musb_base);
7421107b 2372 musb->context.index_regs[i].rxfifoadd =
4f712e01 2373 musb_read_rxfifoadd(musb_base);
7421107b 2374 musb->context.index_regs[i].txfifosz =
4f712e01 2375 musb_read_txfifosz(musb_base);
7421107b 2376 musb->context.index_regs[i].rxfifosz =
4f712e01
AKG		 2377 musb_read_rxfifosz(musb_base);
2378 }
032ec49f
FB		 2379
2380 musb->context.index_regs[i].txtype =
2381 musb_readb(epio, MUSB_TXTYPE);
2382 musb->context.index_regs[i].txinterval =
2383 musb_readb(epio, MUSB_TXINTERVAL);
2384 musb->context.index_regs[i].rxtype =
2385 musb_readb(epio, MUSB_RXTYPE);
2386 musb->context.index_regs[i].rxinterval =
2387 musb_readb(epio, MUSB_RXINTERVAL);
2388
2389 musb->context.index_regs[i].txfunaddr =
6cc2af6d 2390 musb_read_txfunaddr(musb, i);
032ec49f 2391 musb->context.index_regs[i].txhubaddr =
6cc2af6d 2392 musb_read_txhubaddr(musb, i);
032ec49f 2393 musb->context.index_regs[i].txhubport =
6cc2af6d 2394 musb_read_txhubport(musb, i);
032ec49f
FB		 2395
2396 musb->context.index_regs[i].rxfunaddr =
6cc2af6d 2397 musb_read_rxfunaddr(musb, i);
032ec49f 2398 musb->context.index_regs[i].rxhubaddr =
6cc2af6d 2399 musb_read_rxhubaddr(musb, i);
032ec49f 2400 musb->context.index_regs[i].rxhubport =
6cc2af6d 2401 musb_read_rxhubport(musb, i);
4f712e01 2402 }
4f712e01
AKG		 2403}
2404
3c8a5fcc 2405static void musb_restore_context(struct musb *musb)
4f712e01
AKG		 2406{
2407 int i;
2408 void __iomem *musb_base = musb->mregs;
ae9b2ad2 2409 void __iomem *epio;
33f8d75f 2410 u8 power;
4f712e01 2411
032ec49f
FB		 2412 musb_writew(musb_base, MUSB_FRAME, musb->context.frame);
2413 musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode);
2414 musb_write_ulpi_buscontrol(musb->mregs, musb->context.busctl);
33f8d75f
RQ		 2415
2416 /* Don't affect SUSPENDM/RESUME bits in POWER reg */
2417 power = musb_readb(musb_base, MUSB_POWER);
2418 power &= MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME;
2419 musb->context.power &= ~(MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME);
2420 power |= musb->context.power;
2421 musb_writeb(musb_base, MUSB_POWER, power);
2422
b18d26f6 2423 musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe);
af5ec14d 2424 musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe);
7421107b
FB		 2425 musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe);
2426 musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);
4f712e01 2427
ae9b2ad2 2428 for (i = 0; i < musb->config->num_eps; ++i) {
e4e5b136
FB		 2429 struct musb_hw_ep *hw_ep;
2430
2431 hw_ep = &musb->endpoints[i];
2432 if (!hw_ep)
2433 continue;
2434
2435 epio = hw_ep->regs;
2436 if (!epio)
2437 continue;
2438
ea737554 2439 musb_writeb(musb_base, MUSB_INDEX, i);
ae9b2ad2 2440 musb_writew(epio, MUSB_TXMAXP,
7421107b 2441 musb->context.index_regs[i].txmaxp);
ae9b2ad2 2442 musb_writew(epio, MUSB_TXCSR,
7421107b 2443 musb->context.index_regs[i].txcsr);
ae9b2ad2 2444 musb_writew(epio, MUSB_RXMAXP,
7421107b 2445 musb->context.index_regs[i].rxmaxp);
ae9b2ad2 2446 musb_writew(epio, MUSB_RXCSR,
7421107b 2447 musb->context.index_regs[i].rxcsr);
4f712e01
AKG		 2448
2449 if (musb->dyn_fifo) {
2450 musb_write_txfifosz(musb_base,
7421107b 2451 musb->context.index_regs[i].txfifosz);
4f712e01 2452 musb_write_rxfifosz(musb_base,
7421107b 2453 musb->context.index_regs[i].rxfifosz);
4f712e01 2454 musb_write_txfifoadd(musb_base,
7421107b 2455 musb->context.index_regs[i].txfifoadd);
4f712e01 2456 musb_write_rxfifoadd(musb_base,
7421107b 2457 musb->context.index_regs[i].rxfifoadd);
4f712e01
AKG		 2458 }
2459
032ec49f 2460 musb_writeb(epio, MUSB_TXTYPE,
7421107b 2461 musb->context.index_regs[i].txtype);
032ec49f 2462 musb_writeb(epio, MUSB_TXINTERVAL,
7421107b 2463 musb->context.index_regs[i].txinterval);
032ec49f 2464 musb_writeb(epio, MUSB_RXTYPE,
7421107b 2465 musb->context.index_regs[i].rxtype);
032ec49f 2466 musb_writeb(epio, MUSB_RXINTERVAL,
4f712e01 2467
032ec49f 2468 musb->context.index_regs[i].rxinterval);
6cc2af6d 2469 musb_write_txfunaddr(musb, i,
7421107b 2470 musb->context.index_regs[i].txfunaddr);
6cc2af6d 2471 musb_write_txhubaddr(musb, i,
7421107b 2472 musb->context.index_regs[i].txhubaddr);
6cc2af6d 2473 musb_write_txhubport(musb, i,
7421107b 2474 musb->context.index_regs[i].txhubport);
4f712e01 2475
6cc2af6d 2476 musb_write_rxfunaddr(musb, i,
7421107b 2477 musb->context.index_regs[i].rxfunaddr);
6cc2af6d 2478 musb_write_rxhubaddr(musb, i,
7421107b 2479 musb->context.index_regs[i].rxhubaddr);
6cc2af6d 2480 musb_write_rxhubport(musb, i,
7421107b 2481 musb->context.index_regs[i].rxhubport);
4f712e01 2482 }
3c5fec75 2483 musb_writeb(musb_base, MUSB_INDEX, musb->context.index);
4f712e01
AKG		 2484}
2485
48fea965 2486static int musb_suspend(struct device *dev)
550a7375 2487{
8220796d 2488 struct musb *musb = dev_to_musb(dev);
550a7375 2489 unsigned long flags;
550a7375 2490
6fc6f4b8
PH		 2491 musb_platform_disable(musb);
2492 musb_generic_disable(musb);
2493
550a7375
FB		 2494 spin_lock_irqsave(&musb->lock, flags);
2495
2496 if (is_peripheral_active(musb)) {
2497 /* FIXME force disconnect unless we know USB will wake
2498 * the system up quickly enough to respond ...
2499 */
2500 } else if (is_host_active(musb)) {
2501 /* we know all the children are suspended; sometimes
2502 * they will even be wakeup-enabled.
2503 */
2504 }
2505
c338412b
DM		 2506 musb_save_context(musb);
2507
550a7375
FB		 2508 spin_unlock_irqrestore(&musb->lock, flags);
2509 return 0;
2510}
2511
3e87d9a3 2512static int musb_resume(struct device *dev)
550a7375 2513{
c338412b 2514 struct musb *musb = dev_to_musb(dev);
b87fd2f7
SAS		 2515 u8 devctl;
2516 u8 mask;
c338412b
DM		 2517
2518 /*
2519 * For static cmos like DaVinci, register values were preserved
0ec8fd70
KK		 2520 * unless for some reason the whole soc powered down or the USB
2521 * module got reset through the PSC (vs just being disabled).
c338412b
DM		 2522 *
2523 * For the DSPS glue layer though, a full register restore has to
2524 * be done. As it shouldn't harm other platforms, we do it
2525 * unconditionally.
550a7375 2526 */
c338412b
DM		 2527
2528 musb_restore_context(musb);
2529
b87fd2f7
SAS		 2530 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2531 mask = MUSB_DEVCTL_BDEVICE | MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV;
2532 if ((devctl & mask) != (musb->context.devctl & mask))
2533 musb->port1_status = 0;
baadd52f
SAS		 2534 if (musb->need_finish_resume) {
2535 musb->need_finish_resume = 0;
2536 schedule_delayed_work(&musb->finish_resume_work,
309be239 2537 msecs_to_jiffies(USB_RESUME_TIMEOUT));
baadd52f 2538 }
a1fc1920
SAS		 2539
2540 /*
2541 * The USB HUB code expects the device to be in RPM_ACTIVE once it came
2542 * out of suspend
2543 */
2544 pm_runtime_disable(dev);
2545 pm_runtime_set_active(dev);
2546 pm_runtime_enable(dev);
6fc6f4b8
PH		 2547
2548 musb_start(musb);
2549
550a7375
FB		 2550 return 0;
2551}
2552
7acc6197
HH		 2553static int musb_runtime_suspend(struct device *dev)
2554{
2555 struct musb *musb = dev_to_musb(dev);
2556
2557 musb_save_context(musb);
2558
2559 return 0;
2560}
2561
2562static int musb_runtime_resume(struct device *dev)
2563{
2564 struct musb *musb = dev_to_musb(dev);
2565 static int first = 1;
2566
2567 /*
2568 * When pm_runtime_get_sync called for the first time in driver
2569 * init, some of the structure is still not initialized which is
2570 * used in restore function. But clock needs to be
2571 * enabled before any register access, so
2572 * pm_runtime_get_sync has to be called.
2573 * Also context restore without save does not make
2574 * any sense
2575 */
2576 if (!first)
2577 musb_restore_context(musb);
2578 first = 0;
2579
9298b4aa
BL		 2580 if (musb->need_finish_resume) {
2581 musb->need_finish_resume = 0;
2582 schedule_delayed_work(&musb->finish_resume_work,
309be239 2583 msecs_to_jiffies(USB_RESUME_TIMEOUT));
9298b4aa
BL		 2584 }
2585
7acc6197
HH		 2586 return 0;
2587}
2588
47145210 2589static const struct dev_pm_ops musb_dev_pm_ops = {
48fea965 2590 .suspend = musb_suspend,
3e87d9a3 2591 .resume = musb_resume,
7acc6197
HH		 2592 .runtime_suspend = musb_runtime_suspend,
2593 .runtime_resume = musb_runtime_resume,
48fea965
MD		 2594};
2595
2596#define MUSB_DEV_PM_OPS (&musb_dev_pm_ops)
550a7375 2597#else
48fea965 2598#define MUSB_DEV_PM_OPS NULL
550a7375
FB		 2599#endif
2600
2601static struct platform_driver musb_driver = {
2602 .driver = {
2603 .name = (char *)musb_driver_name,
2604 .bus = &platform_bus_type,
48fea965 2605 .pm = MUSB_DEV_PM_OPS,
550a7375 2606 },
e9e8c85e 2607 .probe = musb_probe,
7690417d 2608 .remove = musb_remove,
550a7375
FB		 2609};
2610
89f836a8 2611module_platform_driver(musb_driver);
Linux 6.x block layer and io_uring tree(s)