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  * SPDX-License-Identifier:	GPL-2.0
9  */
10 
11 /*
12  * Inventra (Multipoint) Dual-Role Controller Driver for Linux.
13  *
14  * This consists of a Host Controller Driver (HCD) and a peripheral
15  * controller driver implementing the "Gadget" API; OTG support is
16  * in the works.  These are normal Linux-USB controller drivers which
17  * use IRQs and have no dedicated thread.
18  *
19  * This version of the driver has only been used with products from
20  * Texas Instruments.  Those products integrate the Inventra logic
21  * with other DMA, IRQ, and bus modules, as well as other logic that
22  * needs to be reflected in this driver.
23  *
24  *
25  * NOTE:  the original Mentor code here was pretty much a collection
26  * of mechanisms that don't seem to have been fully integrated/working
27  * for *any* Linux kernel version.  This version aims at Linux 2.6.now,
28  * Key open issues include:
29  *
30  *  - Lack of host-side transaction scheduling, for all transfer types.
31  *    The hardware doesn't do it; instead, software must.
32  *
33  *    This is not an issue for OTG devices that don't support external
34  *    hubs, but for more "normal" USB hosts it's a user issue that the
35  *    "multipoint" support doesn't scale in the expected ways.  That
36  *    includes DaVinci EVM in a common non-OTG mode.
37  *
38  *      * Control and bulk use dedicated endpoints, and there's as
39  *        yet no mechanism to either (a) reclaim the hardware when
40  *        peripherals are NAKing, which gets complicated with bulk
41  *        endpoints, or (b) use more than a single bulk endpoint in
42  *        each direction.
43  *
44  *        RESULT:  one device may be perceived as blocking another one.
45  *
46  *      * Interrupt and isochronous will dynamically allocate endpoint
47  *        hardware, but (a) there's no record keeping for bandwidth;
48  *        (b) in the common case that few endpoints are available, there
49  *        is no mechanism to reuse endpoints to talk to multiple devices.
50  *
51  *        RESULT:  At one extreme, bandwidth can be overcommitted in
52  *        some hardware configurations, no faults will be reported.
53  *        At the other extreme, the bandwidth capabilities which do
54  *        exist tend to be severely undercommitted.  You can't yet hook
55  *        up both a keyboard and a mouse to an external USB hub.
56  */
57 
58 /*
59  * This gets many kinds of configuration information:
60  *	- Kconfig for everything user-configurable
61  *	- platform_device for addressing, irq, and platform_data
62  *	- platform_data is mostly for board-specific informarion
63  *	  (plus recentrly, SOC or family details)
64  *
65  * Most of the conditional compilation will (someday) vanish.
66  */
67 
68 #ifndef __UBOOT__
69 #include <linux/module.h>
70 #include <linux/kernel.h>
71 #include <linux/sched.h>
72 #include <linux/slab.h>
73 #include <linux/init.h>
74 #include <linux/list.h>
75 #include <linux/kobject.h>
76 #include <linux/prefetch.h>
77 #include <linux/platform_device.h>
78 #include <linux/io.h>
79 #else
80 #include <common.h>
81 #include <usb.h>
82 #include <asm/errno.h>
83 #include <linux/usb/ch9.h>
84 #include <linux/usb/gadget.h>
85 #include <linux/usb/musb.h>
86 #include <asm/io.h>
87 #include "linux-compat.h"
88 #include "usb-compat.h"
89 #endif
90 
91 #include "musb_core.h"
92 
93 #define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON)
94 
95 
96 #define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia"
97 #define DRIVER_DESC "Inventra Dual-Role USB Controller Driver"
98 
99 #define MUSB_VERSION "6.0"
100 
101 #define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION
102 
103 #define MUSB_DRIVER_NAME "musb-hdrc"
104 const char musb_driver_name[] = MUSB_DRIVER_NAME;
105 
106 MODULE_DESCRIPTION(DRIVER_INFO);
107 MODULE_AUTHOR(DRIVER_AUTHOR);
108 MODULE_LICENSE("GPL");
109 MODULE_ALIAS("platform:" MUSB_DRIVER_NAME);
110 
111 
112 #ifndef __UBOOT__
113 /*-------------------------------------------------------------------------*/
114 
115 static inline struct musb *dev_to_musb(struct device *dev)
116 {
117 	return dev_get_drvdata(dev);
118 }
119 #endif
120 
121 /*-------------------------------------------------------------------------*/
122 
123 #ifndef __UBOOT__
124 #ifndef CONFIG_BLACKFIN
125 static int musb_ulpi_read(struct usb_phy *phy, u32 offset)
126 {
127 	void __iomem *addr = phy->io_priv;
128 	int	i = 0;
129 	u8	r;
130 	u8	power;
131 	int	ret;
132 
133 	pm_runtime_get_sync(phy->io_dev);
134 
135 	/* Make sure the transceiver is not in low power mode */
136 	power = musb_readb(addr, MUSB_POWER);
137 	power &= ~MUSB_POWER_SUSPENDM;
138 	musb_writeb(addr, MUSB_POWER, power);
139 
140 	/* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the
141 	 * ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM.
142 	 */
143 
144 	musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)offset);
145 	musb_writeb(addr, MUSB_ULPI_REG_CONTROL,
146 			MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR);
147 
148 	while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
149 				& MUSB_ULPI_REG_CMPLT)) {
150 		i++;
151 		if (i == 10000) {
152 			ret = -ETIMEDOUT;
153 			goto out;
154 		}
155 
156 	}
157 	r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
158 	r &= ~MUSB_ULPI_REG_CMPLT;
159 	musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
160 
161 	ret = musb_readb(addr, MUSB_ULPI_REG_DATA);
162 
163 out:
164 	pm_runtime_put(phy->io_dev);
165 
166 	return ret;
167 }
168 
169 static int musb_ulpi_write(struct usb_phy *phy, u32 offset, u32 data)
170 {
171 	void __iomem *addr = phy->io_priv;
172 	int	i = 0;
173 	u8	r = 0;
174 	u8	power;
175 	int	ret = 0;
176 
177 	pm_runtime_get_sync(phy->io_dev);
178 
179 	/* Make sure the transceiver is not in low power mode */
180 	power = musb_readb(addr, MUSB_POWER);
181 	power &= ~MUSB_POWER_SUSPENDM;
182 	musb_writeb(addr, MUSB_POWER, power);
183 
184 	musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)offset);
185 	musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)data);
186 	musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ);
187 
188 	while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
189 				& MUSB_ULPI_REG_CMPLT)) {
190 		i++;
191 		if (i == 10000) {
192 			ret = -ETIMEDOUT;
193 			goto out;
194 		}
195 	}
196 
197 	r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
198 	r &= ~MUSB_ULPI_REG_CMPLT;
199 	musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
200 
201 out:
202 	pm_runtime_put(phy->io_dev);
203 
204 	return ret;
205 }
206 #else
207 #define musb_ulpi_read		NULL
208 #define musb_ulpi_write		NULL
209 #endif
210 
211 static struct usb_phy_io_ops musb_ulpi_access = {
212 	.read = musb_ulpi_read,
213 	.write = musb_ulpi_write,
214 };
215 #endif
216 
217 /*-------------------------------------------------------------------------*/
218 
219 #if !defined(CONFIG_USB_MUSB_TUSB6010) && !defined(CONFIG_USB_MUSB_BLACKFIN)
220 
221 /*
222  * Load an endpoint's FIFO
223  */
224 void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
225 {
226 	struct musb *musb = hw_ep->musb;
227 	void __iomem *fifo = hw_ep->fifo;
228 
229 	prefetch((u8 *)src);
230 
231 	dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
232 			'T', hw_ep->epnum, fifo, len, src);
233 
234 	/* we can't assume unaligned reads work */
235 	if (likely((0x01 & (unsigned long) src) == 0)) {
236 		u16	index = 0;
237 
238 		/* best case is 32bit-aligned source address */
239 		if ((0x02 & (unsigned long) src) == 0) {
240 			if (len >= 4) {
241 				writesl(fifo, src + index, len >> 2);
242 				index += len & ~0x03;
243 			}
244 			if (len & 0x02) {
245 				musb_writew(fifo, 0, *(u16 *)&src[index]);
246 				index += 2;
247 			}
248 		} else {
249 			if (len >= 2) {
250 				writesw(fifo, src + index, len >> 1);
251 				index += len & ~0x01;
252 			}
253 		}
254 		if (len & 0x01)
255 			musb_writeb(fifo, 0, src[index]);
256 	} else  {
257 		/* byte aligned */
258 		writesb(fifo, src, len);
259 	}
260 }
261 
262 #if !defined(CONFIG_USB_MUSB_AM35X)
263 /*
264  * Unload an endpoint's FIFO
265  */
266 void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
267 {
268 	struct musb *musb = hw_ep->musb;
269 	void __iomem *fifo = hw_ep->fifo;
270 
271 	dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
272 			'R', hw_ep->epnum, fifo, len, dst);
273 
274 	/* we can't assume unaligned writes work */
275 	if (likely((0x01 & (unsigned long) dst) == 0)) {
276 		u16	index = 0;
277 
278 		/* best case is 32bit-aligned destination address */
279 		if ((0x02 & (unsigned long) dst) == 0) {
280 			if (len >= 4) {
281 				readsl(fifo, dst, len >> 2);
282 				index = len & ~0x03;
283 			}
284 			if (len & 0x02) {
285 				*(u16 *)&dst[index] = musb_readw(fifo, 0);
286 				index += 2;
287 			}
288 		} else {
289 			if (len >= 2) {
290 				readsw(fifo, dst, len >> 1);
291 				index = len & ~0x01;
292 			}
293 		}
294 		if (len & 0x01)
295 			dst[index] = musb_readb(fifo, 0);
296 	} else  {
297 		/* byte aligned */
298 		readsb(fifo, dst, len);
299 	}
300 }
301 #endif
302 
303 #endif	/* normal PIO */
304 
305 
306 /*-------------------------------------------------------------------------*/
307 
308 /* for high speed test mode; see USB 2.0 spec 7.1.20 */
309 static const u8 musb_test_packet[53] = {
310 	/* implicit SYNC then DATA0 to start */
311 
312 	/* JKJKJKJK x9 */
313 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
314 	/* JJKKJJKK x8 */
315 	0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
316 	/* JJJJKKKK x8 */
317 	0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
318 	/* JJJJJJJKKKKKKK x8 */
319 	0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
320 	/* JJJJJJJK x8 */
321 	0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd,
322 	/* JKKKKKKK x10, JK */
323 	0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e
324 
325 	/* implicit CRC16 then EOP to end */
326 };
327 
328 void musb_load_testpacket(struct musb *musb)
329 {
330 	void __iomem	*regs = musb->endpoints[0].regs;
331 
332 	musb_ep_select(musb->mregs, 0);
333 	musb_write_fifo(musb->control_ep,
334 			sizeof(musb_test_packet), musb_test_packet);
335 	musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY);
336 }
337 
338 #ifndef __UBOOT__
339 /*-------------------------------------------------------------------------*/
340 
341 /*
342  * Handles OTG hnp timeouts, such as b_ase0_brst
343  */
344 void musb_otg_timer_func(unsigned long data)
345 {
346 	struct musb	*musb = (struct musb *)data;
347 	unsigned long	flags;
348 
349 	spin_lock_irqsave(&musb->lock, flags);
350 	switch (musb->xceiv->state) {
351 	case OTG_STATE_B_WAIT_ACON:
352 		dev_dbg(musb->controller, "HNP: b_wait_acon timeout; back to b_peripheral\n");
353 		musb_g_disconnect(musb);
354 		musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
355 		musb->is_active = 0;
356 		break;
357 	case OTG_STATE_A_SUSPEND:
358 	case OTG_STATE_A_WAIT_BCON:
359 		dev_dbg(musb->controller, "HNP: %s timeout\n",
360 			otg_state_string(musb->xceiv->state));
361 		musb_platform_set_vbus(musb, 0);
362 		musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
363 		break;
364 	default:
365 		dev_dbg(musb->controller, "HNP: Unhandled mode %s\n",
366 			otg_state_string(musb->xceiv->state));
367 	}
368 	musb->ignore_disconnect = 0;
369 	spin_unlock_irqrestore(&musb->lock, flags);
370 }
371 
372 /*
373  * Stops the HNP transition. Caller must take care of locking.
374  */
375 void musb_hnp_stop(struct musb *musb)
376 {
377 	struct usb_hcd	*hcd = musb_to_hcd(musb);
378 	void __iomem	*mbase = musb->mregs;
379 	u8	reg;
380 
381 	dev_dbg(musb->controller, "HNP: stop from %s\n", otg_state_string(musb->xceiv->state));
382 
383 	switch (musb->xceiv->state) {
384 	case OTG_STATE_A_PERIPHERAL:
385 		musb_g_disconnect(musb);
386 		dev_dbg(musb->controller, "HNP: back to %s\n",
387 			otg_state_string(musb->xceiv->state));
388 		break;
389 	case OTG_STATE_B_HOST:
390 		dev_dbg(musb->controller, "HNP: Disabling HR\n");
391 		hcd->self.is_b_host = 0;
392 		musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
393 		MUSB_DEV_MODE(musb);
394 		reg = musb_readb(mbase, MUSB_POWER);
395 		reg |= MUSB_POWER_SUSPENDM;
396 		musb_writeb(mbase, MUSB_POWER, reg);
397 		/* REVISIT: Start SESSION_REQUEST here? */
398 		break;
399 	default:
400 		dev_dbg(musb->controller, "HNP: Stopping in unknown state %s\n",
401 			otg_state_string(musb->xceiv->state));
402 	}
403 
404 	/*
405 	 * When returning to A state after HNP, avoid hub_port_rebounce(),
406 	 * which cause occasional OPT A "Did not receive reset after connect"
407 	 * errors.
408 	 */
409 	musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16);
410 }
411 #endif
412 
413 /*
414  * Interrupt Service Routine to record USB "global" interrupts.
415  * Since these do not happen often and signify things of
416  * paramount importance, it seems OK to check them individually;
417  * the order of the tests is specified in the manual
418  *
419  * @param musb instance pointer
420  * @param int_usb register contents
421  * @param devctl
422  * @param power
423  */
424 
425 static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
426 				u8 devctl, u8 power)
427 {
428 #ifndef __UBOOT__
429 	struct usb_otg *otg = musb->xceiv->otg;
430 #endif
431 	irqreturn_t handled = IRQ_NONE;
432 
433 	dev_dbg(musb->controller, "<== Power=%02x, DevCtl=%02x, int_usb=0x%x\n", power, devctl,
434 		int_usb);
435 
436 #ifndef __UBOOT__
437 	/* in host mode, the peripheral may issue remote wakeup.
438 	 * in peripheral mode, the host may resume the link.
439 	 * spurious RESUME irqs happen too, paired with SUSPEND.
440 	 */
441 	if (int_usb & MUSB_INTR_RESUME) {
442 		handled = IRQ_HANDLED;
443 		dev_dbg(musb->controller, "RESUME (%s)\n", otg_state_string(musb->xceiv->state));
444 
445 		if (devctl & MUSB_DEVCTL_HM) {
446 			void __iomem *mbase = musb->mregs;
447 
448 			switch (musb->xceiv->state) {
449 			case OTG_STATE_A_SUSPEND:
450 				/* remote wakeup?  later, GetPortStatus
451 				 * will stop RESUME signaling
452 				 */
453 
454 				if (power & MUSB_POWER_SUSPENDM) {
455 					/* spurious */
456 					musb->int_usb &= ~MUSB_INTR_SUSPEND;
457 					dev_dbg(musb->controller, "Spurious SUSPENDM\n");
458 					break;
459 				}
460 
461 				power &= ~MUSB_POWER_SUSPENDM;
462 				musb_writeb(mbase, MUSB_POWER,
463 						power | MUSB_POWER_RESUME);
464 
465 				musb->port1_status |=
466 						(USB_PORT_STAT_C_SUSPEND << 16)
467 						| MUSB_PORT_STAT_RESUME;
468 				musb->rh_timer = jiffies
469 						+ msecs_to_jiffies(20);
470 
471 				musb->xceiv->state = OTG_STATE_A_HOST;
472 				musb->is_active = 1;
473 				usb_hcd_resume_root_hub(musb_to_hcd(musb));
474 				break;
475 			case OTG_STATE_B_WAIT_ACON:
476 				musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
477 				musb->is_active = 1;
478 				MUSB_DEV_MODE(musb);
479 				break;
480 			default:
481 				WARNING("bogus %s RESUME (%s)\n",
482 					"host",
483 					otg_state_string(musb->xceiv->state));
484 			}
485 		} else {
486 			switch (musb->xceiv->state) {
487 			case OTG_STATE_A_SUSPEND:
488 				/* possibly DISCONNECT is upcoming */
489 				musb->xceiv->state = OTG_STATE_A_HOST;
490 				usb_hcd_resume_root_hub(musb_to_hcd(musb));
491 				break;
492 			case OTG_STATE_B_WAIT_ACON:
493 			case OTG_STATE_B_PERIPHERAL:
494 				/* disconnect while suspended?  we may
495 				 * not get a disconnect irq...
496 				 */
497 				if ((devctl & MUSB_DEVCTL_VBUS)
498 						!= (3 << MUSB_DEVCTL_VBUS_SHIFT)
499 						) {
500 					musb->int_usb |= MUSB_INTR_DISCONNECT;
501 					musb->int_usb &= ~MUSB_INTR_SUSPEND;
502 					break;
503 				}
504 				musb_g_resume(musb);
505 				break;
506 			case OTG_STATE_B_IDLE:
507 				musb->int_usb &= ~MUSB_INTR_SUSPEND;
508 				break;
509 			default:
510 				WARNING("bogus %s RESUME (%s)\n",
511 					"peripheral",
512 					otg_state_string(musb->xceiv->state));
513 			}
514 		}
515 	}
516 
517 	/* see manual for the order of the tests */
518 	if (int_usb & MUSB_INTR_SESSREQ) {
519 		void __iomem *mbase = musb->mregs;
520 
521 		if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS
522 				&& (devctl & MUSB_DEVCTL_BDEVICE)) {
523 			dev_dbg(musb->controller, "SessReq while on B state\n");
524 			return IRQ_HANDLED;
525 		}
526 
527 		dev_dbg(musb->controller, "SESSION_REQUEST (%s)\n",
528 			otg_state_string(musb->xceiv->state));
529 
530 		/* IRQ arrives from ID pin sense or (later, if VBUS power
531 		 * is removed) SRP.  responses are time critical:
532 		 *  - turn on VBUS (with silicon-specific mechanism)
533 		 *  - go through A_WAIT_VRISE
534 		 *  - ... to A_WAIT_BCON.
535 		 * a_wait_vrise_tmout triggers VBUS_ERROR transitions
536 		 */
537 		musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
538 		musb->ep0_stage = MUSB_EP0_START;
539 		musb->xceiv->state = OTG_STATE_A_IDLE;
540 		MUSB_HST_MODE(musb);
541 		musb_platform_set_vbus(musb, 1);
542 
543 		handled = IRQ_HANDLED;
544 	}
545 
546 	if (int_usb & MUSB_INTR_VBUSERROR) {
547 		int	ignore = 0;
548 
549 		/* During connection as an A-Device, we may see a short
550 		 * current spikes causing voltage drop, because of cable
551 		 * and peripheral capacitance combined with vbus draw.
552 		 * (So: less common with truly self-powered devices, where
553 		 * vbus doesn't act like a power supply.)
554 		 *
555 		 * Such spikes are short; usually less than ~500 usec, max
556 		 * of ~2 msec.  That is, they're not sustained overcurrent
557 		 * errors, though they're reported using VBUSERROR irqs.
558 		 *
559 		 * Workarounds:  (a) hardware: use self powered devices.
560 		 * (b) software:  ignore non-repeated VBUS errors.
561 		 *
562 		 * REVISIT:  do delays from lots of DEBUG_KERNEL checks
563 		 * make trouble here, keeping VBUS < 4.4V ?
564 		 */
565 		switch (musb->xceiv->state) {
566 		case OTG_STATE_A_HOST:
567 			/* recovery is dicey once we've gotten past the
568 			 * initial stages of enumeration, but if VBUS
569 			 * stayed ok at the other end of the link, and
570 			 * another reset is due (at least for high speed,
571 			 * to redo the chirp etc), it might work OK...
572 			 */
573 		case OTG_STATE_A_WAIT_BCON:
574 		case OTG_STATE_A_WAIT_VRISE:
575 			if (musb->vbuserr_retry) {
576 				void __iomem *mbase = musb->mregs;
577 
578 				musb->vbuserr_retry--;
579 				ignore = 1;
580 				devctl |= MUSB_DEVCTL_SESSION;
581 				musb_writeb(mbase, MUSB_DEVCTL, devctl);
582 			} else {
583 				musb->port1_status |=
584 					  USB_PORT_STAT_OVERCURRENT
585 					| (USB_PORT_STAT_C_OVERCURRENT << 16);
586 			}
587 			break;
588 		default:
589 			break;
590 		}
591 
592 		dev_dbg(musb->controller, "VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n",
593 				otg_state_string(musb->xceiv->state),
594 				devctl,
595 				({ char *s;
596 				switch (devctl & MUSB_DEVCTL_VBUS) {
597 				case 0 << MUSB_DEVCTL_VBUS_SHIFT:
598 					s = "<SessEnd"; break;
599 				case 1 << MUSB_DEVCTL_VBUS_SHIFT:
600 					s = "<AValid"; break;
601 				case 2 << MUSB_DEVCTL_VBUS_SHIFT:
602 					s = "<VBusValid"; break;
603 				/* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */
604 				default:
605 					s = "VALID"; break;
606 				}; s; }),
607 				VBUSERR_RETRY_COUNT - musb->vbuserr_retry,
608 				musb->port1_status);
609 
610 		/* go through A_WAIT_VFALL then start a new session */
611 		if (!ignore)
612 			musb_platform_set_vbus(musb, 0);
613 		handled = IRQ_HANDLED;
614 	}
615 
616 	if (int_usb & MUSB_INTR_SUSPEND) {
617 		dev_dbg(musb->controller, "SUSPEND (%s) devctl %02x power %02x\n",
618 			otg_state_string(musb->xceiv->state), devctl, power);
619 		handled = IRQ_HANDLED;
620 
621 		switch (musb->xceiv->state) {
622 		case OTG_STATE_A_PERIPHERAL:
623 			/* We also come here if the cable is removed, since
624 			 * this silicon doesn't report ID-no-longer-grounded.
625 			 *
626 			 * We depend on T(a_wait_bcon) to shut us down, and
627 			 * hope users don't do anything dicey during this
628 			 * undesired detour through A_WAIT_BCON.
629 			 */
630 			musb_hnp_stop(musb);
631 			usb_hcd_resume_root_hub(musb_to_hcd(musb));
632 			musb_root_disconnect(musb);
633 			musb_platform_try_idle(musb, jiffies
634 					+ msecs_to_jiffies(musb->a_wait_bcon
635 						? : OTG_TIME_A_WAIT_BCON));
636 
637 			break;
638 		case OTG_STATE_B_IDLE:
639 			if (!musb->is_active)
640 				break;
641 		case OTG_STATE_B_PERIPHERAL:
642 			musb_g_suspend(musb);
643 			musb->is_active = is_otg_enabled(musb)
644 					&& otg->gadget->b_hnp_enable;
645 			if (musb->is_active) {
646 				musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
647 				dev_dbg(musb->controller, "HNP: Setting timer for b_ase0_brst\n");
648 				mod_timer(&musb->otg_timer, jiffies
649 					+ msecs_to_jiffies(
650 							OTG_TIME_B_ASE0_BRST));
651 			}
652 			break;
653 		case OTG_STATE_A_WAIT_BCON:
654 			if (musb->a_wait_bcon != 0)
655 				musb_platform_try_idle(musb, jiffies
656 					+ msecs_to_jiffies(musb->a_wait_bcon));
657 			break;
658 		case OTG_STATE_A_HOST:
659 			musb->xceiv->state = OTG_STATE_A_SUSPEND;
660 			musb->is_active = is_otg_enabled(musb)
661 					&& otg->host->b_hnp_enable;
662 			break;
663 		case OTG_STATE_B_HOST:
664 			/* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */
665 			dev_dbg(musb->controller, "REVISIT: SUSPEND as B_HOST\n");
666 			break;
667 		default:
668 			/* "should not happen" */
669 			musb->is_active = 0;
670 			break;
671 		}
672 	}
673 #endif
674 
675 	if (int_usb & MUSB_INTR_CONNECT) {
676 		struct usb_hcd *hcd = musb_to_hcd(musb);
677 
678 		handled = IRQ_HANDLED;
679 		musb->is_active = 1;
680 
681 		musb->ep0_stage = MUSB_EP0_START;
682 
683 		/* flush endpoints when transitioning from Device Mode */
684 		if (is_peripheral_active(musb)) {
685 			/* REVISIT HNP; just force disconnect */
686 		}
687 		musb_writew(musb->mregs, MUSB_INTRTXE, musb->epmask);
688 		musb_writew(musb->mregs, MUSB_INTRRXE, musb->epmask & 0xfffe);
689 		musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7);
690 #ifndef __UBOOT__
691 		musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED
692 					|USB_PORT_STAT_HIGH_SPEED
693 					|USB_PORT_STAT_ENABLE
694 					);
695 		musb->port1_status |= USB_PORT_STAT_CONNECTION
696 					|(USB_PORT_STAT_C_CONNECTION << 16);
697 
698 		/* high vs full speed is just a guess until after reset */
699 		if (devctl & MUSB_DEVCTL_LSDEV)
700 			musb->port1_status |= USB_PORT_STAT_LOW_SPEED;
701 
702 		/* indicate new connection to OTG machine */
703 		switch (musb->xceiv->state) {
704 		case OTG_STATE_B_PERIPHERAL:
705 			if (int_usb & MUSB_INTR_SUSPEND) {
706 				dev_dbg(musb->controller, "HNP: SUSPEND+CONNECT, now b_host\n");
707 				int_usb &= ~MUSB_INTR_SUSPEND;
708 				goto b_host;
709 			} else
710 				dev_dbg(musb->controller, "CONNECT as b_peripheral???\n");
711 			break;
712 		case OTG_STATE_B_WAIT_ACON:
713 			dev_dbg(musb->controller, "HNP: CONNECT, now b_host\n");
714 b_host:
715 			musb->xceiv->state = OTG_STATE_B_HOST;
716 			hcd->self.is_b_host = 1;
717 			musb->ignore_disconnect = 0;
718 			del_timer(&musb->otg_timer);
719 			break;
720 		default:
721 			if ((devctl & MUSB_DEVCTL_VBUS)
722 					== (3 << MUSB_DEVCTL_VBUS_SHIFT)) {
723 				musb->xceiv->state = OTG_STATE_A_HOST;
724 				hcd->self.is_b_host = 0;
725 			}
726 			break;
727 		}
728 
729 		/* poke the root hub */
730 		MUSB_HST_MODE(musb);
731 		if (hcd->status_urb)
732 			usb_hcd_poll_rh_status(hcd);
733 		else
734 			usb_hcd_resume_root_hub(hcd);
735 
736 		dev_dbg(musb->controller, "CONNECT (%s) devctl %02x\n",
737 				otg_state_string(musb->xceiv->state), devctl);
738 #endif
739 	}
740 
741 #ifndef __UBOOT__
742 	if ((int_usb & MUSB_INTR_DISCONNECT) && !musb->ignore_disconnect) {
743 		dev_dbg(musb->controller, "DISCONNECT (%s) as %s, devctl %02x\n",
744 				otg_state_string(musb->xceiv->state),
745 				MUSB_MODE(musb), devctl);
746 		handled = IRQ_HANDLED;
747 
748 		switch (musb->xceiv->state) {
749 		case OTG_STATE_A_HOST:
750 		case OTG_STATE_A_SUSPEND:
751 			usb_hcd_resume_root_hub(musb_to_hcd(musb));
752 			musb_root_disconnect(musb);
753 			if (musb->a_wait_bcon != 0 && is_otg_enabled(musb))
754 				musb_platform_try_idle(musb, jiffies
755 					+ msecs_to_jiffies(musb->a_wait_bcon));
756 			break;
757 		case OTG_STATE_B_HOST:
758 			/* REVISIT this behaves for "real disconnect"
759 			 * cases; make sure the other transitions from
760 			 * from B_HOST act right too.  The B_HOST code
761 			 * in hnp_stop() is currently not used...
762 			 */
763 			musb_root_disconnect(musb);
764 			musb_to_hcd(musb)->self.is_b_host = 0;
765 			musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
766 			MUSB_DEV_MODE(musb);
767 			musb_g_disconnect(musb);
768 			break;
769 		case OTG_STATE_A_PERIPHERAL:
770 			musb_hnp_stop(musb);
771 			musb_root_disconnect(musb);
772 			/* FALLTHROUGH */
773 		case OTG_STATE_B_WAIT_ACON:
774 			/* FALLTHROUGH */
775 		case OTG_STATE_B_PERIPHERAL:
776 		case OTG_STATE_B_IDLE:
777 			musb_g_disconnect(musb);
778 			break;
779 		default:
780 			WARNING("unhandled DISCONNECT transition (%s)\n",
781 				otg_state_string(musb->xceiv->state));
782 			break;
783 		}
784 	}
785 
786 	/* mentor saves a bit: bus reset and babble share the same irq.
787 	 * only host sees babble; only peripheral sees bus reset.
788 	 */
789 	if (int_usb & MUSB_INTR_RESET) {
790 		handled = IRQ_HANDLED;
791 		if (is_host_capable() && (devctl & MUSB_DEVCTL_HM) != 0) {
792 			/*
793 			 * Looks like non-HS BABBLE can be ignored, but
794 			 * HS BABBLE is an error condition. For HS the solution
795 			 * is to avoid babble in the first place and fix what
796 			 * caused BABBLE. When HS BABBLE happens we can only
797 			 * stop the session.
798 			 */
799 			if (devctl & (MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV))
800 				dev_dbg(musb->controller, "BABBLE devctl: %02x\n", devctl);
801 			else {
802 				ERR("Stopping host session -- babble\n");
803 				musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
804 			}
805 		} else if (is_peripheral_capable()) {
806 			dev_dbg(musb->controller, "BUS RESET as %s\n",
807 				otg_state_string(musb->xceiv->state));
808 			switch (musb->xceiv->state) {
809 			case OTG_STATE_A_SUSPEND:
810 				/* We need to ignore disconnect on suspend
811 				 * otherwise tusb 2.0 won't reconnect after a
812 				 * power cycle, which breaks otg compliance.
813 				 */
814 				musb->ignore_disconnect = 1;
815 				musb_g_reset(musb);
816 				/* FALLTHROUGH */
817 			case OTG_STATE_A_WAIT_BCON:	/* OPT TD.4.7-900ms */
818 				/* never use invalid T(a_wait_bcon) */
819 				dev_dbg(musb->controller, "HNP: in %s, %d msec timeout\n",
820 					otg_state_string(musb->xceiv->state),
821 					TA_WAIT_BCON(musb));
822 				mod_timer(&musb->otg_timer, jiffies
823 					+ msecs_to_jiffies(TA_WAIT_BCON(musb)));
824 				break;
825 			case OTG_STATE_A_PERIPHERAL:
826 				musb->ignore_disconnect = 0;
827 				del_timer(&musb->otg_timer);
828 				musb_g_reset(musb);
829 				break;
830 			case OTG_STATE_B_WAIT_ACON:
831 				dev_dbg(musb->controller, "HNP: RESET (%s), to b_peripheral\n",
832 					otg_state_string(musb->xceiv->state));
833 				musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
834 				musb_g_reset(musb);
835 				break;
836 			case OTG_STATE_B_IDLE:
837 				musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
838 				/* FALLTHROUGH */
839 			case OTG_STATE_B_PERIPHERAL:
840 				musb_g_reset(musb);
841 				break;
842 			default:
843 				dev_dbg(musb->controller, "Unhandled BUS RESET as %s\n",
844 					otg_state_string(musb->xceiv->state));
845 			}
846 		}
847 	}
848 #endif
849 
850 #if 0
851 /* REVISIT ... this would be for multiplexing periodic endpoints, or
852  * supporting transfer phasing to prevent exceeding ISO bandwidth
853  * limits of a given frame or microframe.
854  *
855  * It's not needed for peripheral side, which dedicates endpoints;
856  * though it _might_ use SOF irqs for other purposes.
857  *
858  * And it's not currently needed for host side, which also dedicates
859  * endpoints, relies on TX/RX interval registers, and isn't claimed
860  * to support ISO transfers yet.
861  */
862 	if (int_usb & MUSB_INTR_SOF) {
863 		void __iomem *mbase = musb->mregs;
864 		struct musb_hw_ep	*ep;
865 		u8 epnum;
866 		u16 frame;
867 
868 		dev_dbg(musb->controller, "START_OF_FRAME\n");
869 		handled = IRQ_HANDLED;
870 
871 		/* start any periodic Tx transfers waiting for current frame */
872 		frame = musb_readw(mbase, MUSB_FRAME);
873 		ep = musb->endpoints;
874 		for (epnum = 1; (epnum < musb->nr_endpoints)
875 					&& (musb->epmask >= (1 << epnum));
876 				epnum++, ep++) {
877 			/*
878 			 * FIXME handle framecounter wraps (12 bits)
879 			 * eliminate duplicated StartUrb logic
880 			 */
881 			if (ep->dwWaitFrame >= frame) {
882 				ep->dwWaitFrame = 0;
883 				pr_debug("SOF --> periodic TX%s on %d\n",
884 					ep->tx_channel ? " DMA" : "",
885 					epnum);
886 				if (!ep->tx_channel)
887 					musb_h_tx_start(musb, epnum);
888 				else
889 					cppi_hostdma_start(musb, epnum);
890 			}
891 		}		/* end of for loop */
892 	}
893 #endif
894 
895 	schedule_work(&musb->irq_work);
896 
897 	return handled;
898 }
899 
900 /*-------------------------------------------------------------------------*/
901 
902 /*
903 * Program the HDRC to start (enable interrupts, dma, etc.).
904 */
905 #ifndef __UBOOT__
906 void musb_start(struct musb *musb)
907 #else
908 int musb_start(struct musb *musb)
909 #endif
910 {
911 	void __iomem	*regs = musb->mregs;
912 	u8		devctl = musb_readb(regs, MUSB_DEVCTL);
913 #ifdef __UBOOT__
914 	int ret;
915 #endif
916 
917 	dev_dbg(musb->controller, "<== devctl %02x\n", devctl);
918 
919 	/*  Set INT enable registers, enable interrupts */
920 	musb_writew(regs, MUSB_INTRTXE, musb->epmask);
921 	musb_writew(regs, MUSB_INTRRXE, musb->epmask & 0xfffe);
922 	musb_writeb(regs, MUSB_INTRUSBE, 0xf7);
923 
924 	musb_writeb(regs, MUSB_TESTMODE, 0);
925 
926 	/* put into basic highspeed mode and start session */
927 	musb_writeb(regs, MUSB_POWER, MUSB_POWER_ISOUPDATE
928 						| MUSB_POWER_HSENAB
929 						/* ENSUSPEND wedges tusb */
930 						/* | MUSB_POWER_ENSUSPEND */
931 						);
932 
933 	musb->is_active = 0;
934 	devctl = musb_readb(regs, MUSB_DEVCTL);
935 	devctl &= ~MUSB_DEVCTL_SESSION;
936 
937 	if (is_otg_enabled(musb)) {
938 #ifndef __UBOOT__
939 		/* session started after:
940 		 * (a) ID-grounded irq, host mode;
941 		 * (b) vbus present/connect IRQ, peripheral mode;
942 		 * (c) peripheral initiates, using SRP
943 		 */
944 		if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
945 			musb->is_active = 1;
946 		else
947 			devctl |= MUSB_DEVCTL_SESSION;
948 #endif
949 
950 	} else if (is_host_enabled(musb)) {
951 		/* assume ID pin is hard-wired to ground */
952 		devctl |= MUSB_DEVCTL_SESSION;
953 
954 	} else /* peripheral is enabled */ {
955 		if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
956 			musb->is_active = 1;
957 	}
958 
959 #ifndef __UBOOT__
960 	musb_platform_enable(musb);
961 #else
962 	ret = musb_platform_enable(musb);
963 	if (ret) {
964 		musb->is_active = 0;
965 		return ret;
966 	}
967 #endif
968 	musb_writeb(regs, MUSB_DEVCTL, devctl);
969 
970 #ifdef __UBOOT__
971 	return 0;
972 #endif
973 }
974 
975 
976 static void musb_generic_disable(struct musb *musb)
977 {
978 	void __iomem	*mbase = musb->mregs;
979 	u16	temp;
980 
981 	/* disable interrupts */
982 	musb_writeb(mbase, MUSB_INTRUSBE, 0);
983 	musb_writew(mbase, MUSB_INTRTXE, 0);
984 	musb_writew(mbase, MUSB_INTRRXE, 0);
985 
986 	/* off */
987 	musb_writeb(mbase, MUSB_DEVCTL, 0);
988 
989 	/*  flush pending interrupts */
990 	temp = musb_readb(mbase, MUSB_INTRUSB);
991 	temp = musb_readw(mbase, MUSB_INTRTX);
992 	temp = musb_readw(mbase, MUSB_INTRRX);
993 
994 }
995 
996 /*
997  * Make the HDRC stop (disable interrupts, etc.);
998  * reversible by musb_start
999  * called on gadget driver unregister
1000  * with controller locked, irqs blocked
1001  * acts as a NOP unless some role activated the hardware
1002  */
1003 void musb_stop(struct musb *musb)
1004 {
1005 	/* stop IRQs, timers, ... */
1006 	musb_platform_disable(musb);
1007 	musb_generic_disable(musb);
1008 	dev_dbg(musb->controller, "HDRC disabled\n");
1009 
1010 	/* FIXME
1011 	 *  - mark host and/or peripheral drivers unusable/inactive
1012 	 *  - disable DMA (and enable it in HdrcStart)
1013 	 *  - make sure we can musb_start() after musb_stop(); with
1014 	 *    OTG mode, gadget driver module rmmod/modprobe cycles that
1015 	 *  - ...
1016 	 */
1017 	musb_platform_try_idle(musb, 0);
1018 }
1019 
1020 #ifndef __UBOOT__
1021 static void musb_shutdown(struct platform_device *pdev)
1022 {
1023 	struct musb	*musb = dev_to_musb(&pdev->dev);
1024 	unsigned long	flags;
1025 
1026 	pm_runtime_get_sync(musb->controller);
1027 
1028 	musb_gadget_cleanup(musb);
1029 
1030 	spin_lock_irqsave(&musb->lock, flags);
1031 	musb_platform_disable(musb);
1032 	musb_generic_disable(musb);
1033 	spin_unlock_irqrestore(&musb->lock, flags);
1034 
1035 	if (!is_otg_enabled(musb) && is_host_enabled(musb))
1036 		usb_remove_hcd(musb_to_hcd(musb));
1037 	musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
1038 	musb_platform_exit(musb);
1039 
1040 	pm_runtime_put(musb->controller);
1041 	/* FIXME power down */
1042 }
1043 #endif
1044 
1045 
1046 /*-------------------------------------------------------------------------*/
1047 
1048 /*
1049  * The silicon either has hard-wired endpoint configurations, or else
1050  * "dynamic fifo" sizing.  The driver has support for both, though at this
1051  * writing only the dynamic sizing is very well tested.   Since we switched
1052  * away from compile-time hardware parameters, we can no longer rely on
1053  * dead code elimination to leave only the relevant one in the object file.
1054  *
1055  * We don't currently use dynamic fifo setup capability to do anything
1056  * more than selecting one of a bunch of predefined configurations.
1057  */
1058 #if defined(CONFIG_USB_MUSB_TUSB6010)			\
1059 	|| defined(CONFIG_USB_MUSB_TUSB6010_MODULE)	\
1060 	|| defined(CONFIG_USB_MUSB_OMAP2PLUS)		\
1061 	|| defined(CONFIG_USB_MUSB_OMAP2PLUS_MODULE)	\
1062 	|| defined(CONFIG_USB_MUSB_AM35X)		\
1063 	|| defined(CONFIG_USB_MUSB_AM35X_MODULE)	\
1064 	|| defined(CONFIG_USB_MUSB_DSPS)		\
1065 	|| defined(CONFIG_USB_MUSB_DSPS_MODULE)
1066 static ushort __devinitdata fifo_mode = 4;
1067 #elif defined(CONFIG_USB_MUSB_UX500)			\
1068 	|| defined(CONFIG_USB_MUSB_UX500_MODULE)
1069 static ushort __devinitdata fifo_mode = 5;
1070 #else
1071 static ushort __devinitdata fifo_mode = 2;
1072 #endif
1073 
1074 /* "modprobe ... fifo_mode=1" etc */
1075 module_param(fifo_mode, ushort, 0);
1076 MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration");
1077 
1078 /*
1079  * tables defining fifo_mode values.  define more if you like.
1080  * for host side, make sure both halves of ep1 are set up.
1081  */
1082 
1083 /* mode 0 - fits in 2KB */
1084 static struct musb_fifo_cfg __devinitdata mode_0_cfg[] = {
1085 { .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, },
1086 { .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, },
1087 { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, },
1088 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1089 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1090 };
1091 
1092 /* mode 1 - fits in 4KB */
1093 static struct musb_fifo_cfg __devinitdata mode_1_cfg[] = {
1094 { .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
1095 { .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
1096 { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1097 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1098 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1099 };
1100 
1101 /* mode 2 - fits in 4KB */
1102 static struct musb_fifo_cfg __devinitdata mode_2_cfg[] = {
1103 { .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, },
1104 { .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, },
1105 { .hw_ep_num = 2, .style = FIFO_TX,   .maxpacket = 512, },
1106 { .hw_ep_num = 2, .style = FIFO_RX,   .maxpacket = 512, },
1107 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1108 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1109 };
1110 
1111 /* mode 3 - fits in 4KB */
1112 static struct musb_fifo_cfg __devinitdata mode_3_cfg[] = {
1113 { .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
1114 { .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
1115 { .hw_ep_num = 2, .style = FIFO_TX,   .maxpacket = 512, },
1116 { .hw_ep_num = 2, .style = FIFO_RX,   .maxpacket = 512, },
1117 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1118 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1119 };
1120 
1121 /* mode 4 - fits in 16KB */
1122 static struct musb_fifo_cfg __devinitdata mode_4_cfg[] = {
1123 { .hw_ep_num =  1, .style = FIFO_TX,   .maxpacket = 512, },
1124 { .hw_ep_num =  1, .style = FIFO_RX,   .maxpacket = 512, },
1125 { .hw_ep_num =  2, .style = FIFO_TX,   .maxpacket = 512, },
1126 { .hw_ep_num =  2, .style = FIFO_RX,   .maxpacket = 512, },
1127 { .hw_ep_num =  3, .style = FIFO_TX,   .maxpacket = 512, },
1128 { .hw_ep_num =  3, .style = FIFO_RX,   .maxpacket = 512, },
1129 { .hw_ep_num =  4, .style = FIFO_TX,   .maxpacket = 512, },
1130 { .hw_ep_num =  4, .style = FIFO_RX,   .maxpacket = 512, },
1131 { .hw_ep_num =  5, .style = FIFO_TX,   .maxpacket = 512, },
1132 { .hw_ep_num =  5, .style = FIFO_RX,   .maxpacket = 512, },
1133 { .hw_ep_num =  6, .style = FIFO_TX,   .maxpacket = 512, },
1134 { .hw_ep_num =  6, .style = FIFO_RX,   .maxpacket = 512, },
1135 { .hw_ep_num =  7, .style = FIFO_TX,   .maxpacket = 512, },
1136 { .hw_ep_num =  7, .style = FIFO_RX,   .maxpacket = 512, },
1137 { .hw_ep_num =  8, .style = FIFO_TX,   .maxpacket = 512, },
1138 { .hw_ep_num =  8, .style = FIFO_RX,   .maxpacket = 512, },
1139 { .hw_ep_num =  9, .style = FIFO_TX,   .maxpacket = 512, },
1140 { .hw_ep_num =  9, .style = FIFO_RX,   .maxpacket = 512, },
1141 { .hw_ep_num = 10, .style = FIFO_TX,   .maxpacket = 256, },
1142 { .hw_ep_num = 10, .style = FIFO_RX,   .maxpacket = 64, },
1143 { .hw_ep_num = 11, .style = FIFO_TX,   .maxpacket = 256, },
1144 { .hw_ep_num = 11, .style = FIFO_RX,   .maxpacket = 64, },
1145 { .hw_ep_num = 12, .style = FIFO_TX,   .maxpacket = 256, },
1146 { .hw_ep_num = 12, .style = FIFO_RX,   .maxpacket = 64, },
1147 { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, },
1148 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1149 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1150 };
1151 
1152 /* mode 5 - fits in 8KB */
1153 static struct musb_fifo_cfg __devinitdata mode_5_cfg[] = {
1154 { .hw_ep_num =  1, .style = FIFO_TX,   .maxpacket = 512, },
1155 { .hw_ep_num =  1, .style = FIFO_RX,   .maxpacket = 512, },
1156 { .hw_ep_num =  2, .style = FIFO_TX,   .maxpacket = 512, },
1157 { .hw_ep_num =  2, .style = FIFO_RX,   .maxpacket = 512, },
1158 { .hw_ep_num =  3, .style = FIFO_TX,   .maxpacket = 512, },
1159 { .hw_ep_num =  3, .style = FIFO_RX,   .maxpacket = 512, },
1160 { .hw_ep_num =  4, .style = FIFO_TX,   .maxpacket = 512, },
1161 { .hw_ep_num =  4, .style = FIFO_RX,   .maxpacket = 512, },
1162 { .hw_ep_num =  5, .style = FIFO_TX,   .maxpacket = 512, },
1163 { .hw_ep_num =  5, .style = FIFO_RX,   .maxpacket = 512, },
1164 { .hw_ep_num =  6, .style = FIFO_TX,   .maxpacket = 32, },
1165 { .hw_ep_num =  6, .style = FIFO_RX,   .maxpacket = 32, },
1166 { .hw_ep_num =  7, .style = FIFO_TX,   .maxpacket = 32, },
1167 { .hw_ep_num =  7, .style = FIFO_RX,   .maxpacket = 32, },
1168 { .hw_ep_num =  8, .style = FIFO_TX,   .maxpacket = 32, },
1169 { .hw_ep_num =  8, .style = FIFO_RX,   .maxpacket = 32, },
1170 { .hw_ep_num =  9, .style = FIFO_TX,   .maxpacket = 32, },
1171 { .hw_ep_num =  9, .style = FIFO_RX,   .maxpacket = 32, },
1172 { .hw_ep_num = 10, .style = FIFO_TX,   .maxpacket = 32, },
1173 { .hw_ep_num = 10, .style = FIFO_RX,   .maxpacket = 32, },
1174 { .hw_ep_num = 11, .style = FIFO_TX,   .maxpacket = 32, },
1175 { .hw_ep_num = 11, .style = FIFO_RX,   .maxpacket = 32, },
1176 { .hw_ep_num = 12, .style = FIFO_TX,   .maxpacket = 32, },
1177 { .hw_ep_num = 12, .style = FIFO_RX,   .maxpacket = 32, },
1178 { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, },
1179 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1180 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1181 };
1182 
1183 /*
1184  * configure a fifo; for non-shared endpoints, this may be called
1185  * once for a tx fifo and once for an rx fifo.
1186  *
1187  * returns negative errno or offset for next fifo.
1188  */
1189 static int __devinit
1190 fifo_setup(struct musb *musb, struct musb_hw_ep  *hw_ep,
1191 		const struct musb_fifo_cfg *cfg, u16 offset)
1192 {
1193 	void __iomem	*mbase = musb->mregs;
1194 	int	size = 0;
1195 	u16	maxpacket = cfg->maxpacket;
1196 	u16	c_off = offset >> 3;
1197 	u8	c_size;
1198 
1199 	/* expect hw_ep has already been zero-initialized */
1200 
1201 	size = ffs(max(maxpacket, (u16) 8)) - 1;
1202 	maxpacket = 1 << size;
1203 
1204 	c_size = size - 3;
1205 	if (cfg->mode == BUF_DOUBLE) {
1206 		if ((offset + (maxpacket << 1)) >
1207 				(1 << (musb->config->ram_bits + 2)))
1208 			return -EMSGSIZE;
1209 		c_size |= MUSB_FIFOSZ_DPB;
1210 	} else {
1211 		if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2)))
1212 			return -EMSGSIZE;
1213 	}
1214 
1215 	/* configure the FIFO */
1216 	musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum);
1217 
1218 	/* EP0 reserved endpoint for control, bidirectional;
1219 	 * EP1 reserved for bulk, two unidirection halves.
1220 	 */
1221 	if (hw_ep->epnum == 1)
1222 		musb->bulk_ep = hw_ep;
1223 	/* REVISIT error check:  be sure ep0 can both rx and tx ... */
1224 	switch (cfg->style) {
1225 	case FIFO_TX:
1226 		musb_write_txfifosz(mbase, c_size);
1227 		musb_write_txfifoadd(mbase, c_off);
1228 		hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1229 		hw_ep->max_packet_sz_tx = maxpacket;
1230 		break;
1231 	case FIFO_RX:
1232 		musb_write_rxfifosz(mbase, c_size);
1233 		musb_write_rxfifoadd(mbase, c_off);
1234 		hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1235 		hw_ep->max_packet_sz_rx = maxpacket;
1236 		break;
1237 	case FIFO_RXTX:
1238 		musb_write_txfifosz(mbase, c_size);
1239 		musb_write_txfifoadd(mbase, c_off);
1240 		hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1241 		hw_ep->max_packet_sz_rx = maxpacket;
1242 
1243 		musb_write_rxfifosz(mbase, c_size);
1244 		musb_write_rxfifoadd(mbase, c_off);
1245 		hw_ep->tx_double_buffered = hw_ep->rx_double_buffered;
1246 		hw_ep->max_packet_sz_tx = maxpacket;
1247 
1248 		hw_ep->is_shared_fifo = true;
1249 		break;
1250 	}
1251 
1252 	/* NOTE rx and tx endpoint irqs aren't managed separately,
1253 	 * which happens to be ok
1254 	 */
1255 	musb->epmask |= (1 << hw_ep->epnum);
1256 
1257 	return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0));
1258 }
1259 
1260 static struct musb_fifo_cfg __devinitdata ep0_cfg = {
1261 	.style = FIFO_RXTX, .maxpacket = 64,
1262 };
1263 
1264 static int __devinit ep_config_from_table(struct musb *musb)
1265 {
1266 	const struct musb_fifo_cfg	*cfg;
1267 	unsigned		i, n;
1268 	int			offset;
1269 	struct musb_hw_ep	*hw_ep = musb->endpoints;
1270 
1271 	if (musb->config->fifo_cfg) {
1272 		cfg = musb->config->fifo_cfg;
1273 		n = musb->config->fifo_cfg_size;
1274 		goto done;
1275 	}
1276 
1277 	switch (fifo_mode) {
1278 	default:
1279 		fifo_mode = 0;
1280 		/* FALLTHROUGH */
1281 	case 0:
1282 		cfg = mode_0_cfg;
1283 		n = ARRAY_SIZE(mode_0_cfg);
1284 		break;
1285 	case 1:
1286 		cfg = mode_1_cfg;
1287 		n = ARRAY_SIZE(mode_1_cfg);
1288 		break;
1289 	case 2:
1290 		cfg = mode_2_cfg;
1291 		n = ARRAY_SIZE(mode_2_cfg);
1292 		break;
1293 	case 3:
1294 		cfg = mode_3_cfg;
1295 		n = ARRAY_SIZE(mode_3_cfg);
1296 		break;
1297 	case 4:
1298 		cfg = mode_4_cfg;
1299 		n = ARRAY_SIZE(mode_4_cfg);
1300 		break;
1301 	case 5:
1302 		cfg = mode_5_cfg;
1303 		n = ARRAY_SIZE(mode_5_cfg);
1304 		break;
1305 	}
1306 
1307 	pr_debug("%s: setup fifo_mode %d\n", musb_driver_name, fifo_mode);
1308 
1309 done:
1310 	offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0);
1311 	/* assert(offset > 0) */
1312 
1313 	/* NOTE:  for RTL versions >= 1.400 EPINFO and RAMINFO would
1314 	 * be better than static musb->config->num_eps and DYN_FIFO_SIZE...
1315 	 */
1316 
1317 	for (i = 0; i < n; i++) {
1318 		u8	epn = cfg->hw_ep_num;
1319 
1320 		if (epn >= musb->config->num_eps) {
1321 			pr_debug("%s: invalid ep %d\n",
1322 					musb_driver_name, epn);
1323 			return -EINVAL;
1324 		}
1325 		offset = fifo_setup(musb, hw_ep + epn, cfg++, offset);
1326 		if (offset < 0) {
1327 			pr_debug("%s: mem overrun, ep %d\n",
1328 					musb_driver_name, epn);
1329 			return -EINVAL;
1330 		}
1331 		epn++;
1332 		musb->nr_endpoints = max(epn, musb->nr_endpoints);
1333 	}
1334 
1335 	pr_debug("%s: %d/%d max ep, %d/%d memory\n", musb_driver_name, n + 1,
1336 		 musb->config->num_eps * 2 - 1, offset,
1337 		 (1 << (musb->config->ram_bits + 2)));
1338 
1339 	if (!musb->bulk_ep) {
1340 		pr_debug("%s: missing bulk\n", musb_driver_name);
1341 		return -EINVAL;
1342 	}
1343 
1344 	return 0;
1345 }
1346 
1347 
1348 /*
1349  * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false
1350  * @param musb the controller
1351  */
1352 static int __devinit ep_config_from_hw(struct musb *musb)
1353 {
1354 	u8 epnum = 0;
1355 	struct musb_hw_ep *hw_ep;
1356 	void *mbase = musb->mregs;
1357 	int ret = 0;
1358 
1359 	dev_dbg(musb->controller, "<== static silicon ep config\n");
1360 
1361 	/* FIXME pick up ep0 maxpacket size */
1362 
1363 	for (epnum = 1; epnum < musb->config->num_eps; epnum++) {
1364 		musb_ep_select(mbase, epnum);
1365 		hw_ep = musb->endpoints + epnum;
1366 
1367 		ret = musb_read_fifosize(musb, hw_ep, epnum);
1368 		if (ret < 0)
1369 			break;
1370 
1371 		/* FIXME set up hw_ep->{rx,tx}_double_buffered */
1372 
1373 		/* pick an RX/TX endpoint for bulk */
1374 		if (hw_ep->max_packet_sz_tx < 512
1375 				|| hw_ep->max_packet_sz_rx < 512)
1376 			continue;
1377 
1378 		/* REVISIT:  this algorithm is lazy, we should at least
1379 		 * try to pick a double buffered endpoint.
1380 		 */
1381 		if (musb->bulk_ep)
1382 			continue;
1383 		musb->bulk_ep = hw_ep;
1384 	}
1385 
1386 	if (!musb->bulk_ep) {
1387 		pr_debug("%s: missing bulk\n", musb_driver_name);
1388 		return -EINVAL;
1389 	}
1390 
1391 	return 0;
1392 }
1393 
1394 enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, };
1395 
1396 /* Initialize MUSB (M)HDRC part of the USB hardware subsystem;
1397  * configure endpoints, or take their config from silicon
1398  */
1399 static int __devinit musb_core_init(u16 musb_type, struct musb *musb)
1400 {
1401 	u8 reg;
1402 	char *type;
1403 	char aInfo[90], aRevision[32], aDate[12];
1404 	void __iomem	*mbase = musb->mregs;
1405 	int		status = 0;
1406 	int		i;
1407 
1408 	/* log core options (read using indexed model) */
1409 	reg = musb_read_configdata(mbase);
1410 
1411 	strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8");
1412 	if (reg & MUSB_CONFIGDATA_DYNFIFO) {
1413 		strcat(aInfo, ", dyn FIFOs");
1414 		musb->dyn_fifo = true;
1415 	}
1416 #ifndef CONFIG_USB_MUSB_DISABLE_BULK_COMBINE_SPLIT
1417 	if (reg & MUSB_CONFIGDATA_MPRXE) {
1418 		strcat(aInfo, ", bulk combine");
1419 		musb->bulk_combine = true;
1420 	}
1421 	if (reg & MUSB_CONFIGDATA_MPTXE) {
1422 		strcat(aInfo, ", bulk split");
1423 		musb->bulk_split = true;
1424 	}
1425 #else
1426 	musb->bulk_combine = false;
1427 	musb->bulk_split = false;
1428 #endif
1429 	if (reg & MUSB_CONFIGDATA_HBRXE) {
1430 		strcat(aInfo, ", HB-ISO Rx");
1431 		musb->hb_iso_rx = true;
1432 	}
1433 	if (reg & MUSB_CONFIGDATA_HBTXE) {
1434 		strcat(aInfo, ", HB-ISO Tx");
1435 		musb->hb_iso_tx = true;
1436 	}
1437 	if (reg & MUSB_CONFIGDATA_SOFTCONE)
1438 		strcat(aInfo, ", SoftConn");
1439 
1440 	pr_debug("%s:ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo);
1441 
1442 	aDate[0] = 0;
1443 	if (MUSB_CONTROLLER_MHDRC == musb_type) {
1444 		musb->is_multipoint = 1;
1445 		type = "M";
1446 	} else {
1447 		musb->is_multipoint = 0;
1448 		type = "";
1449 #ifndef	CONFIG_USB_OTG_BLACKLIST_HUB
1450 		printk(KERN_ERR
1451 			"%s: kernel must blacklist external hubs\n",
1452 			musb_driver_name);
1453 #endif
1454 	}
1455 
1456 	/* log release info */
1457 	musb->hwvers = musb_read_hwvers(mbase);
1458 	snprintf(aRevision, 32, "%d.%d%s", MUSB_HWVERS_MAJOR(musb->hwvers),
1459 		MUSB_HWVERS_MINOR(musb->hwvers),
1460 		(musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
1461 	pr_debug("%s: %sHDRC RTL version %s %s\n", musb_driver_name, type,
1462 		 aRevision, aDate);
1463 
1464 	/* configure ep0 */
1465 	musb_configure_ep0(musb);
1466 
1467 	/* discover endpoint configuration */
1468 	musb->nr_endpoints = 1;
1469 	musb->epmask = 1;
1470 
1471 	if (musb->dyn_fifo)
1472 		status = ep_config_from_table(musb);
1473 	else
1474 		status = ep_config_from_hw(musb);
1475 
1476 	if (status < 0)
1477 		return status;
1478 
1479 	/* finish init, and print endpoint config */
1480 	for (i = 0; i < musb->nr_endpoints; i++) {
1481 		struct musb_hw_ep	*hw_ep = musb->endpoints + i;
1482 
1483 		hw_ep->fifo = MUSB_FIFO_OFFSET(i) + mbase;
1484 #if defined(CONFIG_USB_MUSB_TUSB6010) || defined (CONFIG_USB_MUSB_TUSB6010_MODULE)
1485 		hw_ep->fifo_async = musb->async + 0x400 + MUSB_FIFO_OFFSET(i);
1486 		hw_ep->fifo_sync = musb->sync + 0x400 + MUSB_FIFO_OFFSET(i);
1487 		hw_ep->fifo_sync_va =
1488 			musb->sync_va + 0x400 + MUSB_FIFO_OFFSET(i);
1489 
1490 		if (i == 0)
1491 			hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF;
1492 		else
1493 			hw_ep->conf = mbase + 0x400 + (((i - 1) & 0xf) << 2);
1494 #endif
1495 
1496 		hw_ep->regs = MUSB_EP_OFFSET(i, 0) + mbase;
1497 		hw_ep->target_regs = musb_read_target_reg_base(i, mbase);
1498 		hw_ep->rx_reinit = 1;
1499 		hw_ep->tx_reinit = 1;
1500 
1501 		if (hw_ep->max_packet_sz_tx) {
1502 			dev_dbg(musb->controller,
1503 				"%s: hw_ep %d%s, %smax %d\n",
1504 				musb_driver_name, i,
1505 				hw_ep->is_shared_fifo ? "shared" : "tx",
1506 				hw_ep->tx_double_buffered
1507 					? "doublebuffer, " : "",
1508 				hw_ep->max_packet_sz_tx);
1509 		}
1510 		if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) {
1511 			dev_dbg(musb->controller,
1512 				"%s: hw_ep %d%s, %smax %d\n",
1513 				musb_driver_name, i,
1514 				"rx",
1515 				hw_ep->rx_double_buffered
1516 					? "doublebuffer, " : "",
1517 				hw_ep->max_packet_sz_rx);
1518 		}
1519 		if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx))
1520 			dev_dbg(musb->controller, "hw_ep %d not configured\n", i);
1521 	}
1522 
1523 	return 0;
1524 }
1525 
1526 /*-------------------------------------------------------------------------*/
1527 
1528 #if defined(CONFIG_SOC_OMAP2430) || defined(CONFIG_SOC_OMAP3430) || \
1529 	defined(CONFIG_ARCH_OMAP4)
1530 
1531 static irqreturn_t generic_interrupt(int irq, void *__hci)
1532 {
1533 	unsigned long	flags;
1534 	irqreturn_t	retval = IRQ_NONE;
1535 	struct musb	*musb = __hci;
1536 
1537 	spin_lock_irqsave(&musb->lock, flags);
1538 
1539 	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
1540 	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
1541 	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
1542 
1543 	if (musb->int_usb || musb->int_tx || musb->int_rx)
1544 		retval = musb_interrupt(musb);
1545 
1546 	spin_unlock_irqrestore(&musb->lock, flags);
1547 
1548 	return retval;
1549 }
1550 
1551 #else
1552 #define generic_interrupt	NULL
1553 #endif
1554 
1555 /*
1556  * handle all the irqs defined by the HDRC core. for now we expect:  other
1557  * irq sources (phy, dma, etc) will be handled first, musb->int_* values
1558  * will be assigned, and the irq will already have been acked.
1559  *
1560  * called in irq context with spinlock held, irqs blocked
1561  */
1562 irqreturn_t musb_interrupt(struct musb *musb)
1563 {
1564 	irqreturn_t	retval = IRQ_NONE;
1565 	u8		devctl, power;
1566 	int		ep_num;
1567 	u32		reg;
1568 
1569 	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1570 	power = musb_readb(musb->mregs, MUSB_POWER);
1571 
1572 	dev_dbg(musb->controller, "** IRQ %s usb%04x tx%04x rx%04x\n",
1573 		(devctl & MUSB_DEVCTL_HM) ? "host" : "peripheral",
1574 		musb->int_usb, musb->int_tx, musb->int_rx);
1575 
1576 	/* the core can interrupt us for multiple reasons; docs have
1577 	 * a generic interrupt flowchart to follow
1578 	 */
1579 	if (musb->int_usb)
1580 		retval |= musb_stage0_irq(musb, musb->int_usb,
1581 				devctl, power);
1582 
1583 	/* "stage 1" is handling endpoint irqs */
1584 
1585 	/* handle endpoint 0 first */
1586 	if (musb->int_tx & 1) {
1587 		if (devctl & MUSB_DEVCTL_HM) {
1588 			if (is_host_capable())
1589 				retval |= musb_h_ep0_irq(musb);
1590 		} else {
1591 			if (is_peripheral_capable())
1592 				retval |= musb_g_ep0_irq(musb);
1593 		}
1594 	}
1595 
1596 	/* RX on endpoints 1-15 */
1597 	reg = musb->int_rx >> 1;
1598 	ep_num = 1;
1599 	while (reg) {
1600 		if (reg & 1) {
1601 			/* musb_ep_select(musb->mregs, ep_num); */
1602 			/* REVISIT just retval = ep->rx_irq(...) */
1603 			retval = IRQ_HANDLED;
1604 			if (devctl & MUSB_DEVCTL_HM) {
1605 				if (is_host_capable())
1606 					musb_host_rx(musb, ep_num);
1607 			} else {
1608 				if (is_peripheral_capable())
1609 					musb_g_rx(musb, ep_num);
1610 			}
1611 		}
1612 
1613 		reg >>= 1;
1614 		ep_num++;
1615 	}
1616 
1617 	/* TX on endpoints 1-15 */
1618 	reg = musb->int_tx >> 1;
1619 	ep_num = 1;
1620 	while (reg) {
1621 		if (reg & 1) {
1622 			/* musb_ep_select(musb->mregs, ep_num); */
1623 			/* REVISIT just retval |= ep->tx_irq(...) */
1624 			retval = IRQ_HANDLED;
1625 			if (devctl & MUSB_DEVCTL_HM) {
1626 				if (is_host_capable())
1627 					musb_host_tx(musb, ep_num);
1628 			} else {
1629 				if (is_peripheral_capable())
1630 					musb_g_tx(musb, ep_num);
1631 			}
1632 		}
1633 		reg >>= 1;
1634 		ep_num++;
1635 	}
1636 
1637 	return retval;
1638 }
1639 EXPORT_SYMBOL_GPL(musb_interrupt);
1640 
1641 #ifndef CONFIG_USB_MUSB_PIO_ONLY
1642 static bool __devinitdata use_dma = 1;
1643 
1644 /* "modprobe ... use_dma=0" etc */
1645 module_param(use_dma, bool, 0);
1646 MODULE_PARM_DESC(use_dma, "enable/disable use of DMA");
1647 
1648 void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit)
1649 {
1650 	u8	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1651 
1652 	/* called with controller lock already held */
1653 
1654 	if (!epnum) {
1655 #ifndef CONFIG_USB_TUSB_OMAP_DMA
1656 		if (!is_cppi_enabled()) {
1657 			/* endpoint 0 */
1658 			if (devctl & MUSB_DEVCTL_HM)
1659 				musb_h_ep0_irq(musb);
1660 			else
1661 				musb_g_ep0_irq(musb);
1662 		}
1663 #endif
1664 	} else {
1665 		/* endpoints 1..15 */
1666 		if (transmit) {
1667 			if (devctl & MUSB_DEVCTL_HM) {
1668 				if (is_host_capable())
1669 					musb_host_tx(musb, epnum);
1670 			} else {
1671 				if (is_peripheral_capable())
1672 					musb_g_tx(musb, epnum);
1673 			}
1674 		} else {
1675 			/* receive */
1676 			if (devctl & MUSB_DEVCTL_HM) {
1677 				if (is_host_capable())
1678 					musb_host_rx(musb, epnum);
1679 			} else {
1680 				if (is_peripheral_capable())
1681 					musb_g_rx(musb, epnum);
1682 			}
1683 		}
1684 	}
1685 }
1686 EXPORT_SYMBOL_GPL(musb_dma_completion);
1687 
1688 #else
1689 #define use_dma			0
1690 #endif
1691 
1692 /*-------------------------------------------------------------------------*/
1693 
1694 #ifdef CONFIG_SYSFS
1695 
1696 static ssize_t
1697 musb_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
1698 {
1699 	struct musb *musb = dev_to_musb(dev);
1700 	unsigned long flags;
1701 	int ret = -EINVAL;
1702 
1703 	spin_lock_irqsave(&musb->lock, flags);
1704 	ret = sprintf(buf, "%s\n", otg_state_string(musb->xceiv->state));
1705 	spin_unlock_irqrestore(&musb->lock, flags);
1706 
1707 	return ret;
1708 }
1709 
1710 static ssize_t
1711 musb_mode_store(struct device *dev, struct device_attribute *attr,
1712 		const char *buf, size_t n)
1713 {
1714 	struct musb	*musb = dev_to_musb(dev);
1715 	unsigned long	flags;
1716 	int		status;
1717 
1718 	spin_lock_irqsave(&musb->lock, flags);
1719 	if (sysfs_streq(buf, "host"))
1720 		status = musb_platform_set_mode(musb, MUSB_HOST);
1721 	else if (sysfs_streq(buf, "peripheral"))
1722 		status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
1723 	else if (sysfs_streq(buf, "otg"))
1724 		status = musb_platform_set_mode(musb, MUSB_OTG);
1725 	else
1726 		status = -EINVAL;
1727 	spin_unlock_irqrestore(&musb->lock, flags);
1728 
1729 	return (status == 0) ? n : status;
1730 }
1731 static DEVICE_ATTR(mode, 0644, musb_mode_show, musb_mode_store);
1732 
1733 static ssize_t
1734 musb_vbus_store(struct device *dev, struct device_attribute *attr,
1735 		const char *buf, size_t n)
1736 {
1737 	struct musb	*musb = dev_to_musb(dev);
1738 	unsigned long	flags;
1739 	unsigned long	val;
1740 
1741 	if (sscanf(buf, "%lu", &val) < 1) {
1742 		dev_err(dev, "Invalid VBUS timeout ms value\n");
1743 		return -EINVAL;
1744 	}
1745 
1746 	spin_lock_irqsave(&musb->lock, flags);
1747 	/* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
1748 	musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
1749 	if (musb->xceiv->state == OTG_STATE_A_WAIT_BCON)
1750 		musb->is_active = 0;
1751 	musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
1752 	spin_unlock_irqrestore(&musb->lock, flags);
1753 
1754 	return n;
1755 }
1756 
1757 static ssize_t
1758 musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
1759 {
1760 	struct musb	*musb = dev_to_musb(dev);
1761 	unsigned long	flags;
1762 	unsigned long	val;
1763 	int		vbus;
1764 
1765 	spin_lock_irqsave(&musb->lock, flags);
1766 	val = musb->a_wait_bcon;
1767 	/* FIXME get_vbus_status() is normally #defined as false...
1768 	 * and is effectively TUSB-specific.
1769 	 */
1770 	vbus = musb_platform_get_vbus_status(musb);
1771 	spin_unlock_irqrestore(&musb->lock, flags);
1772 
1773 	return sprintf(buf, "Vbus %s, timeout %lu msec\n",
1774 			vbus ? "on" : "off", val);
1775 }
1776 static DEVICE_ATTR(vbus, 0644, musb_vbus_show, musb_vbus_store);
1777 
1778 /* Gadget drivers can't know that a host is connected so they might want
1779  * to start SRP, but users can.  This allows userspace to trigger SRP.
1780  */
1781 static ssize_t
1782 musb_srp_store(struct device *dev, struct device_attribute *attr,
1783 		const char *buf, size_t n)
1784 {
1785 	struct musb	*musb = dev_to_musb(dev);
1786 	unsigned short	srp;
1787 
1788 	if (sscanf(buf, "%hu", &srp) != 1
1789 			|| (srp != 1)) {
1790 		dev_err(dev, "SRP: Value must be 1\n");
1791 		return -EINVAL;
1792 	}
1793 
1794 	if (srp == 1)
1795 		musb_g_wakeup(musb);
1796 
1797 	return n;
1798 }
1799 static DEVICE_ATTR(srp, 0644, NULL, musb_srp_store);
1800 
1801 static struct attribute *musb_attributes[] = {
1802 	&dev_attr_mode.attr,
1803 	&dev_attr_vbus.attr,
1804 	&dev_attr_srp.attr,
1805 	NULL
1806 };
1807 
1808 static const struct attribute_group musb_attr_group = {
1809 	.attrs = musb_attributes,
1810 };
1811 
1812 #endif	/* sysfs */
1813 
1814 #ifndef __UBOOT__
1815 /* Only used to provide driver mode change events */
1816 static void musb_irq_work(struct work_struct *data)
1817 {
1818 	struct musb *musb = container_of(data, struct musb, irq_work);
1819 	static int old_state;
1820 
1821 	if (musb->xceiv->state != old_state) {
1822 		old_state = musb->xceiv->state;
1823 		sysfs_notify(&musb->controller->kobj, NULL, "mode");
1824 	}
1825 }
1826 #endif
1827 
1828 /* --------------------------------------------------------------------------
1829  * Init support
1830  */
1831 
1832 static struct musb *__devinit
1833 allocate_instance(struct device *dev,
1834 		struct musb_hdrc_config *config, void __iomem *mbase)
1835 {
1836 	struct musb		*musb;
1837 	struct musb_hw_ep	*ep;
1838 	int			epnum;
1839 #ifndef __UBOOT__
1840 	struct usb_hcd	*hcd;
1841 
1842 	hcd = usb_create_hcd(&musb_hc_driver, dev, dev_name(dev));
1843 	if (!hcd)
1844 		return NULL;
1845 	/* usbcore sets dev->driver_data to hcd, and sometimes uses that... */
1846 
1847 	musb = hcd_to_musb(hcd);
1848 #else
1849 	musb = calloc(1, sizeof(*musb));
1850 	if (!musb)
1851 		return NULL;
1852 #endif
1853 	INIT_LIST_HEAD(&musb->control);
1854 	INIT_LIST_HEAD(&musb->in_bulk);
1855 	INIT_LIST_HEAD(&musb->out_bulk);
1856 
1857 #ifndef __UBOOT__
1858 	hcd->uses_new_polling = 1;
1859 	hcd->has_tt = 1;
1860 #endif
1861 
1862 	musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
1863 	musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON;
1864 	dev_set_drvdata(dev, musb);
1865 	musb->mregs = mbase;
1866 	musb->ctrl_base = mbase;
1867 	musb->nIrq = -ENODEV;
1868 	musb->config = config;
1869 	BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS);
1870 	for (epnum = 0, ep = musb->endpoints;
1871 			epnum < musb->config->num_eps;
1872 			epnum++, ep++) {
1873 		ep->musb = musb;
1874 		ep->epnum = epnum;
1875 	}
1876 
1877 	musb->controller = dev;
1878 
1879 	return musb;
1880 }
1881 
1882 static void musb_free(struct musb *musb)
1883 {
1884 	/* this has multiple entry modes. it handles fault cleanup after
1885 	 * probe(), where things may be partially set up, as well as rmmod
1886 	 * cleanup after everything's been de-activated.
1887 	 */
1888 
1889 #ifdef CONFIG_SYSFS
1890 	sysfs_remove_group(&musb->controller->kobj, &musb_attr_group);
1891 #endif
1892 
1893 	if (musb->nIrq >= 0) {
1894 		if (musb->irq_wake)
1895 			disable_irq_wake(musb->nIrq);
1896 		free_irq(musb->nIrq, musb);
1897 	}
1898 	if (is_dma_capable() && musb->dma_controller) {
1899 		struct dma_controller	*c = musb->dma_controller;
1900 
1901 		(void) c->stop(c);
1902 		dma_controller_destroy(c);
1903 	}
1904 
1905 	kfree(musb);
1906 }
1907 
1908 /*
1909  * Perform generic per-controller initialization.
1910  *
1911  * @pDevice: the controller (already clocked, etc)
1912  * @nIrq: irq
1913  * @mregs: virtual address of controller registers,
1914  *	not yet corrected for platform-specific offsets
1915  */
1916 #ifndef __UBOOT__
1917 static int __devinit
1918 musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
1919 #else
1920 struct musb *
1921 musb_init_controller(struct musb_hdrc_platform_data *plat, struct device *dev,
1922 			     void *ctrl)
1923 #endif
1924 {
1925 	int			status;
1926 	struct musb		*musb;
1927 #ifndef __UBOOT__
1928 	struct musb_hdrc_platform_data *plat = dev->platform_data;
1929 #else
1930 	int nIrq = 0;
1931 #endif
1932 
1933 	/* The driver might handle more features than the board; OK.
1934 	 * Fail when the board needs a feature that's not enabled.
1935 	 */
1936 	if (!plat) {
1937 		dev_dbg(dev, "no platform_data?\n");
1938 		status = -ENODEV;
1939 		goto fail0;
1940 	}
1941 
1942 	/* allocate */
1943 	musb = allocate_instance(dev, plat->config, ctrl);
1944 	if (!musb) {
1945 		status = -ENOMEM;
1946 		goto fail0;
1947 	}
1948 
1949 	pm_runtime_use_autosuspend(musb->controller);
1950 	pm_runtime_set_autosuspend_delay(musb->controller, 200);
1951 	pm_runtime_enable(musb->controller);
1952 
1953 	spin_lock_init(&musb->lock);
1954 	musb->board_mode = plat->mode;
1955 	musb->board_set_power = plat->set_power;
1956 	musb->min_power = plat->min_power;
1957 	musb->ops = plat->platform_ops;
1958 
1959 	/* The musb_platform_init() call:
1960 	 *   - adjusts musb->mregs and musb->isr if needed,
1961 	 *   - may initialize an integrated tranceiver
1962 	 *   - initializes musb->xceiv, usually by otg_get_phy()
1963 	 *   - stops powering VBUS
1964 	 *
1965 	 * There are various transceiver configurations.  Blackfin,
1966 	 * DaVinci, TUSB60x0, and others integrate them.  OMAP3 uses
1967 	 * external/discrete ones in various flavors (twl4030 family,
1968 	 * isp1504, non-OTG, etc) mostly hooking up through ULPI.
1969 	 */
1970 	musb->isr = generic_interrupt;
1971 	status = musb_platform_init(musb);
1972 	if (status < 0)
1973 		goto fail1;
1974 
1975 	if (!musb->isr) {
1976 		status = -ENODEV;
1977 		goto fail2;
1978 	}
1979 
1980 #ifndef __UBOOT__
1981 	if (!musb->xceiv->io_ops) {
1982 		musb->xceiv->io_dev = musb->controller;
1983 		musb->xceiv->io_priv = musb->mregs;
1984 		musb->xceiv->io_ops = &musb_ulpi_access;
1985 	}
1986 #endif
1987 
1988 	pm_runtime_get_sync(musb->controller);
1989 
1990 #ifndef CONFIG_USB_MUSB_PIO_ONLY
1991 	if (use_dma && dev->dma_mask) {
1992 		struct dma_controller	*c;
1993 
1994 		c = dma_controller_create(musb, musb->mregs);
1995 		musb->dma_controller = c;
1996 		if (c)
1997 			(void) c->start(c);
1998 	}
1999 #endif
2000 #ifndef __UBOOT__
2001 	/* ideally this would be abstracted in platform setup */
2002 	if (!is_dma_capable() || !musb->dma_controller)
2003 		dev->dma_mask = NULL;
2004 #endif
2005 
2006 	/* be sure interrupts are disabled before connecting ISR */
2007 	musb_platform_disable(musb);
2008 	musb_generic_disable(musb);
2009 
2010 	/* setup musb parts of the core (especially endpoints) */
2011 	status = musb_core_init(plat->config->multipoint
2012 			? MUSB_CONTROLLER_MHDRC
2013 			: MUSB_CONTROLLER_HDRC, musb);
2014 	if (status < 0)
2015 		goto fail3;
2016 
2017 	setup_timer(&musb->otg_timer, musb_otg_timer_func, (unsigned long) musb);
2018 
2019 	/* Init IRQ workqueue before request_irq */
2020 	INIT_WORK(&musb->irq_work, musb_irq_work);
2021 
2022 	/* attach to the IRQ */
2023 	if (request_irq(nIrq, musb->isr, 0, dev_name(dev), musb)) {
2024 		dev_err(dev, "request_irq %d failed!\n", nIrq);
2025 		status = -ENODEV;
2026 		goto fail3;
2027 	}
2028 	musb->nIrq = nIrq;
2029 /* FIXME this handles wakeup irqs wrong */
2030 	if (enable_irq_wake(nIrq) == 0) {
2031 		musb->irq_wake = 1;
2032 		device_init_wakeup(dev, 1);
2033 	} else {
2034 		musb->irq_wake = 0;
2035 	}
2036 
2037 #ifndef __UBOOT__
2038 	/* host side needs more setup */
2039 	if (is_host_enabled(musb)) {
2040 		struct usb_hcd	*hcd = musb_to_hcd(musb);
2041 
2042 		otg_set_host(musb->xceiv->otg, &hcd->self);
2043 
2044 		if (is_otg_enabled(musb))
2045 			hcd->self.otg_port = 1;
2046 		musb->xceiv->otg->host = &hcd->self;
2047 		hcd->power_budget = 2 * (plat->power ? : 250);
2048 
2049 		/* program PHY to use external vBus if required */
2050 		if (plat->extvbus) {
2051 			u8 busctl = musb_read_ulpi_buscontrol(musb->mregs);
2052 			busctl |= MUSB_ULPI_USE_EXTVBUS;
2053 			musb_write_ulpi_buscontrol(musb->mregs, busctl);
2054 		}
2055 	}
2056 #endif
2057 
2058 	/* For the host-only role, we can activate right away.
2059 	 * (We expect the ID pin to be forcibly grounded!!)
2060 	 * Otherwise, wait till the gadget driver hooks up.
2061 	 */
2062 	if (!is_otg_enabled(musb) && is_host_enabled(musb)) {
2063 		struct usb_hcd	*hcd = musb_to_hcd(musb);
2064 
2065 		MUSB_HST_MODE(musb);
2066 #ifndef __UBOOT__
2067 		musb->xceiv->otg->default_a = 1;
2068 		musb->xceiv->state = OTG_STATE_A_IDLE;
2069 
2070 		status = usb_add_hcd(musb_to_hcd(musb), 0, 0);
2071 
2072 		hcd->self.uses_pio_for_control = 1;
2073 		dev_dbg(musb->controller, "%s mode, status %d, devctl %02x %c\n",
2074 			"HOST", status,
2075 			musb_readb(musb->mregs, MUSB_DEVCTL),
2076 			(musb_readb(musb->mregs, MUSB_DEVCTL)
2077 					& MUSB_DEVCTL_BDEVICE
2078 				? 'B' : 'A'));
2079 #endif
2080 
2081 	} else /* peripheral is enabled */ {
2082 		MUSB_DEV_MODE(musb);
2083 #ifndef __UBOOT__
2084 		musb->xceiv->otg->default_a = 0;
2085 		musb->xceiv->state = OTG_STATE_B_IDLE;
2086 #endif
2087 
2088 		if (is_peripheral_capable())
2089 			status = musb_gadget_setup(musb);
2090 
2091 #ifndef __UBOOT__
2092 		dev_dbg(musb->controller, "%s mode, status %d, dev%02x\n",
2093 			is_otg_enabled(musb) ? "OTG" : "PERIPHERAL",
2094 			status,
2095 			musb_readb(musb->mregs, MUSB_DEVCTL));
2096 #endif
2097 
2098 	}
2099 	if (status < 0)
2100 		goto fail3;
2101 
2102 	status = musb_init_debugfs(musb);
2103 	if (status < 0)
2104 		goto fail4;
2105 
2106 #ifdef CONFIG_SYSFS
2107 	status = sysfs_create_group(&musb->controller->kobj, &musb_attr_group);
2108 	if (status)
2109 		goto fail5;
2110 #endif
2111 
2112 	pm_runtime_put(musb->controller);
2113 
2114 	pr_debug("USB %s mode controller at %p using %s, IRQ %d\n",
2115 			({char *s;
2116 			 switch (musb->board_mode) {
2117 			 case MUSB_HOST:		s = "Host"; break;
2118 			 case MUSB_PERIPHERAL:	s = "Peripheral"; break;
2119 			 default:		s = "OTG"; break;
2120 			 }; s; }),
2121 			ctrl,
2122 			(is_dma_capable() && musb->dma_controller)
2123 			? "DMA" : "PIO",
2124 			musb->nIrq);
2125 
2126 #ifndef __UBOOT__
2127 	return 0;
2128 #else
2129 	return status == 0 ? musb : NULL;
2130 #endif
2131 
2132 fail5:
2133 	musb_exit_debugfs(musb);
2134 
2135 fail4:
2136 #ifndef __UBOOT__
2137 	if (!is_otg_enabled(musb) && is_host_enabled(musb))
2138 		usb_remove_hcd(musb_to_hcd(musb));
2139 	else
2140 #endif
2141 		musb_gadget_cleanup(musb);
2142 
2143 fail3:
2144 	pm_runtime_put_sync(musb->controller);
2145 
2146 fail2:
2147 	if (musb->irq_wake)
2148 		device_init_wakeup(dev, 0);
2149 	musb_platform_exit(musb);
2150 
2151 fail1:
2152 	dev_err(musb->controller,
2153 		"musb_init_controller failed with status %d\n", status);
2154 
2155 	musb_free(musb);
2156 
2157 fail0:
2158 
2159 #ifndef __UBOOT__
2160 	return status;
2161 #else
2162 	return status == 0 ? musb : NULL;
2163 #endif
2164 
2165 }
2166 
2167 /*-------------------------------------------------------------------------*/
2168 
2169 /* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just
2170  * bridge to a platform device; this driver then suffices.
2171  */
2172 
2173 #ifndef CONFIG_USB_MUSB_PIO_ONLY
2174 static u64	*orig_dma_mask;
2175 #endif
2176 
2177 #ifndef __UBOOT__
2178 static int __devinit musb_probe(struct platform_device *pdev)
2179 {
2180 	struct device	*dev = &pdev->dev;
2181 	int		irq = platform_get_irq_byname(pdev, "mc");
2182 	int		status;
2183 	struct resource	*iomem;
2184 	void __iomem	*base;
2185 
2186 	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2187 	if (!iomem || irq <= 0)
2188 		return -ENODEV;
2189 
2190 	base = ioremap(iomem->start, resource_size(iomem));
2191 	if (!base) {
2192 		dev_err(dev, "ioremap failed\n");
2193 		return -ENOMEM;
2194 	}
2195 
2196 #ifndef CONFIG_USB_MUSB_PIO_ONLY
2197 	/* clobbered by use_dma=n */
2198 	orig_dma_mask = dev->dma_mask;
2199 #endif
2200 	status = musb_init_controller(dev, irq, base);
2201 	if (status < 0)
2202 		iounmap(base);
2203 
2204 	return status;
2205 }
2206 
2207 static int __devexit musb_remove(struct platform_device *pdev)
2208 {
2209 	struct musb	*musb = dev_to_musb(&pdev->dev);
2210 	void __iomem	*ctrl_base = musb->ctrl_base;
2211 
2212 	/* this gets called on rmmod.
2213 	 *  - Host mode: host may still be active
2214 	 *  - Peripheral mode: peripheral is deactivated (or never-activated)
2215 	 *  - OTG mode: both roles are deactivated (or never-activated)
2216 	 */
2217 	musb_exit_debugfs(musb);
2218 	musb_shutdown(pdev);
2219 
2220 	musb_free(musb);
2221 	iounmap(ctrl_base);
2222 	device_init_wakeup(&pdev->dev, 0);
2223 #ifndef CONFIG_USB_MUSB_PIO_ONLY
2224 	pdev->dev.dma_mask = orig_dma_mask;
2225 #endif
2226 	return 0;
2227 }
2228 
2229 #ifdef	CONFIG_PM
2230 
2231 static void musb_save_context(struct musb *musb)
2232 {
2233 	int i;
2234 	void __iomem *musb_base = musb->mregs;
2235 	void __iomem *epio;
2236 
2237 	if (is_host_enabled(musb)) {
2238 		musb->context.frame = musb_readw(musb_base, MUSB_FRAME);
2239 		musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE);
2240 		musb->context.busctl = musb_read_ulpi_buscontrol(musb->mregs);
2241 	}
2242 	musb->context.power = musb_readb(musb_base, MUSB_POWER);
2243 	musb->context.intrtxe = musb_readw(musb_base, MUSB_INTRTXE);
2244 	musb->context.intrrxe = musb_readw(musb_base, MUSB_INTRRXE);
2245 	musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE);
2246 	musb->context.index = musb_readb(musb_base, MUSB_INDEX);
2247 	musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL);
2248 
2249 	for (i = 0; i < musb->config->num_eps; ++i) {
2250 		struct musb_hw_ep	*hw_ep;
2251 
2252 		hw_ep = &musb->endpoints[i];
2253 		if (!hw_ep)
2254 			continue;
2255 
2256 		epio = hw_ep->regs;
2257 		if (!epio)
2258 			continue;
2259 
2260 		musb_writeb(musb_base, MUSB_INDEX, i);
2261 		musb->context.index_regs[i].txmaxp =
2262 			musb_readw(epio, MUSB_TXMAXP);
2263 		musb->context.index_regs[i].txcsr =
2264 			musb_readw(epio, MUSB_TXCSR);
2265 		musb->context.index_regs[i].rxmaxp =
2266 			musb_readw(epio, MUSB_RXMAXP);
2267 		musb->context.index_regs[i].rxcsr =
2268 			musb_readw(epio, MUSB_RXCSR);
2269 
2270 		if (musb->dyn_fifo) {
2271 			musb->context.index_regs[i].txfifoadd =
2272 					musb_read_txfifoadd(musb_base);
2273 			musb->context.index_regs[i].rxfifoadd =
2274 					musb_read_rxfifoadd(musb_base);
2275 			musb->context.index_regs[i].txfifosz =
2276 					musb_read_txfifosz(musb_base);
2277 			musb->context.index_regs[i].rxfifosz =
2278 					musb_read_rxfifosz(musb_base);
2279 		}
2280 		if (is_host_enabled(musb)) {
2281 			musb->context.index_regs[i].txtype =
2282 				musb_readb(epio, MUSB_TXTYPE);
2283 			musb->context.index_regs[i].txinterval =
2284 				musb_readb(epio, MUSB_TXINTERVAL);
2285 			musb->context.index_regs[i].rxtype =
2286 				musb_readb(epio, MUSB_RXTYPE);
2287 			musb->context.index_regs[i].rxinterval =
2288 				musb_readb(epio, MUSB_RXINTERVAL);
2289 
2290 			musb->context.index_regs[i].txfunaddr =
2291 				musb_read_txfunaddr(musb_base, i);
2292 			musb->context.index_regs[i].txhubaddr =
2293 				musb_read_txhubaddr(musb_base, i);
2294 			musb->context.index_regs[i].txhubport =
2295 				musb_read_txhubport(musb_base, i);
2296 
2297 			musb->context.index_regs[i].rxfunaddr =
2298 				musb_read_rxfunaddr(musb_base, i);
2299 			musb->context.index_regs[i].rxhubaddr =
2300 				musb_read_rxhubaddr(musb_base, i);
2301 			musb->context.index_regs[i].rxhubport =
2302 				musb_read_rxhubport(musb_base, i);
2303 		}
2304 	}
2305 }
2306 
2307 static void musb_restore_context(struct musb *musb)
2308 {
2309 	int i;
2310 	void __iomem *musb_base = musb->mregs;
2311 	void __iomem *ep_target_regs;
2312 	void __iomem *epio;
2313 
2314 	if (is_host_enabled(musb)) {
2315 		musb_writew(musb_base, MUSB_FRAME, musb->context.frame);
2316 		musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode);
2317 		musb_write_ulpi_buscontrol(musb->mregs, musb->context.busctl);
2318 	}
2319 	musb_writeb(musb_base, MUSB_POWER, musb->context.power);
2320 	musb_writew(musb_base, MUSB_INTRTXE, musb->context.intrtxe);
2321 	musb_writew(musb_base, MUSB_INTRRXE, musb->context.intrrxe);
2322 	musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe);
2323 	musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);
2324 
2325 	for (i = 0; i < musb->config->num_eps; ++i) {
2326 		struct musb_hw_ep	*hw_ep;
2327 
2328 		hw_ep = &musb->endpoints[i];
2329 		if (!hw_ep)
2330 			continue;
2331 
2332 		epio = hw_ep->regs;
2333 		if (!epio)
2334 			continue;
2335 
2336 		musb_writeb(musb_base, MUSB_INDEX, i);
2337 		musb_writew(epio, MUSB_TXMAXP,
2338 			musb->context.index_regs[i].txmaxp);
2339 		musb_writew(epio, MUSB_TXCSR,
2340 			musb->context.index_regs[i].txcsr);
2341 		musb_writew(epio, MUSB_RXMAXP,
2342 			musb->context.index_regs[i].rxmaxp);
2343 		musb_writew(epio, MUSB_RXCSR,
2344 			musb->context.index_regs[i].rxcsr);
2345 
2346 		if (musb->dyn_fifo) {
2347 			musb_write_txfifosz(musb_base,
2348 				musb->context.index_regs[i].txfifosz);
2349 			musb_write_rxfifosz(musb_base,
2350 				musb->context.index_regs[i].rxfifosz);
2351 			musb_write_txfifoadd(musb_base,
2352 				musb->context.index_regs[i].txfifoadd);
2353 			musb_write_rxfifoadd(musb_base,
2354 				musb->context.index_regs[i].rxfifoadd);
2355 		}
2356 
2357 		if (is_host_enabled(musb)) {
2358 			musb_writeb(epio, MUSB_TXTYPE,
2359 				musb->context.index_regs[i].txtype);
2360 			musb_writeb(epio, MUSB_TXINTERVAL,
2361 				musb->context.index_regs[i].txinterval);
2362 			musb_writeb(epio, MUSB_RXTYPE,
2363 				musb->context.index_regs[i].rxtype);
2364 			musb_writeb(epio, MUSB_RXINTERVAL,
2365 
2366 			musb->context.index_regs[i].rxinterval);
2367 			musb_write_txfunaddr(musb_base, i,
2368 				musb->context.index_regs[i].txfunaddr);
2369 			musb_write_txhubaddr(musb_base, i,
2370 				musb->context.index_regs[i].txhubaddr);
2371 			musb_write_txhubport(musb_base, i,
2372 				musb->context.index_regs[i].txhubport);
2373 
2374 			ep_target_regs =
2375 				musb_read_target_reg_base(i, musb_base);
2376 
2377 			musb_write_rxfunaddr(ep_target_regs,
2378 				musb->context.index_regs[i].rxfunaddr);
2379 			musb_write_rxhubaddr(ep_target_regs,
2380 				musb->context.index_regs[i].rxhubaddr);
2381 			musb_write_rxhubport(ep_target_regs,
2382 				musb->context.index_regs[i].rxhubport);
2383 		}
2384 	}
2385 	musb_writeb(musb_base, MUSB_INDEX, musb->context.index);
2386 }
2387 
2388 static int musb_suspend(struct device *dev)
2389 {
2390 	struct musb	*musb = dev_to_musb(dev);
2391 	unsigned long	flags;
2392 
2393 	spin_lock_irqsave(&musb->lock, flags);
2394 
2395 	if (is_peripheral_active(musb)) {
2396 		/* FIXME force disconnect unless we know USB will wake
2397 		 * the system up quickly enough to respond ...
2398 		 */
2399 	} else if (is_host_active(musb)) {
2400 		/* we know all the children are suspended; sometimes
2401 		 * they will even be wakeup-enabled.
2402 		 */
2403 	}
2404 
2405 	spin_unlock_irqrestore(&musb->lock, flags);
2406 	return 0;
2407 }
2408 
2409 static int musb_resume_noirq(struct device *dev)
2410 {
2411 	/* for static cmos like DaVinci, register values were preserved
2412 	 * unless for some reason the whole soc powered down or the USB
2413 	 * module got reset through the PSC (vs just being disabled).
2414 	 */
2415 	return 0;
2416 }
2417 
2418 static int musb_runtime_suspend(struct device *dev)
2419 {
2420 	struct musb	*musb = dev_to_musb(dev);
2421 
2422 	musb_save_context(musb);
2423 
2424 	return 0;
2425 }
2426 
2427 static int musb_runtime_resume(struct device *dev)
2428 {
2429 	struct musb	*musb = dev_to_musb(dev);
2430 	static int	first = 1;
2431 
2432 	/*
2433 	 * When pm_runtime_get_sync called for the first time in driver
2434 	 * init,  some of the structure is still not initialized which is
2435 	 * used in restore function. But clock needs to be
2436 	 * enabled before any register access, so
2437 	 * pm_runtime_get_sync has to be called.
2438 	 * Also context restore without save does not make
2439 	 * any sense
2440 	 */
2441 	if (!first)
2442 		musb_restore_context(musb);
2443 	first = 0;
2444 
2445 	return 0;
2446 }
2447 
2448 static const struct dev_pm_ops musb_dev_pm_ops = {
2449 	.suspend	= musb_suspend,
2450 	.resume_noirq	= musb_resume_noirq,
2451 	.runtime_suspend = musb_runtime_suspend,
2452 	.runtime_resume = musb_runtime_resume,
2453 };
2454 
2455 #define MUSB_DEV_PM_OPS (&musb_dev_pm_ops)
2456 #else
2457 #define	MUSB_DEV_PM_OPS	NULL
2458 #endif
2459 
2460 static struct platform_driver musb_driver = {
2461 	.driver = {
2462 		.name		= (char *)musb_driver_name,
2463 		.bus		= &platform_bus_type,
2464 		.owner		= THIS_MODULE,
2465 		.pm		= MUSB_DEV_PM_OPS,
2466 	},
2467 	.probe		= musb_probe,
2468 	.remove		= __devexit_p(musb_remove),
2469 	.shutdown	= musb_shutdown,
2470 };
2471 
2472 /*-------------------------------------------------------------------------*/
2473 
2474 static int __init musb_init(void)
2475 {
2476 	if (usb_disabled())
2477 		return 0;
2478 
2479 	pr_info("%s: version " MUSB_VERSION ", "
2480 		"?dma?"
2481 		", "
2482 		"otg (peripheral+host)",
2483 		musb_driver_name);
2484 	return platform_driver_register(&musb_driver);
2485 }
2486 module_init(musb_init);
2487 
2488 static void __exit musb_cleanup(void)
2489 {
2490 	platform_driver_unregister(&musb_driver);
2491 }
2492 module_exit(musb_cleanup);
2493 #endif
2494