xref: /linux/drivers/usb/musb/musb_core.c (revision a1c613ae4c322ddd58d5a8539dbfba2a0380a8c0)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * MUSB OTG driver core code
4  *
5  * Copyright 2005 Mentor Graphics Corporation
6  * Copyright (C) 2005-2006 by Texas Instruments
7  * Copyright (C) 2006-2007 Nokia Corporation
8  */
9 
10 /*
11  * Inventra (Multipoint) Dual-Role Controller Driver for Linux.
12  *
13  * This consists of a Host Controller Driver (HCD) and a peripheral
14  * controller driver implementing the "Gadget" API; OTG support is
15  * in the works.  These are normal Linux-USB controller drivers which
16  * use IRQs and have no dedicated thread.
17  *
18  * This version of the driver has only been used with products from
19  * Texas Instruments.  Those products integrate the Inventra logic
20  * with other DMA, IRQ, and bus modules, as well as other logic that
21  * needs to be reflected in this driver.
22  *
23  *
24  * NOTE:  the original Mentor code here was pretty much a collection
25  * of mechanisms that don't seem to have been fully integrated/working
26  * for *any* Linux kernel version.  This version aims at Linux 2.6.now,
27  * Key open issues include:
28  *
29  *  - Lack of host-side transaction scheduling, for all transfer types.
30  *    The hardware doesn't do it; instead, software must.
31  *
32  *    This is not an issue for OTG devices that don't support external
33  *    hubs, but for more "normal" USB hosts it's a user issue that the
34  *    "multipoint" support doesn't scale in the expected ways.  That
35  *    includes DaVinci EVM in a common non-OTG mode.
36  *
37  *      * Control and bulk use dedicated endpoints, and there's as
38  *        yet no mechanism to either (a) reclaim the hardware when
39  *        peripherals are NAKing, which gets complicated with bulk
40  *        endpoints, or (b) use more than a single bulk endpoint in
41  *        each direction.
42  *
43  *        RESULT:  one device may be perceived as blocking another one.
44  *
45  *      * Interrupt and isochronous will dynamically allocate endpoint
46  *        hardware, but (a) there's no record keeping for bandwidth;
47  *        (b) in the common case that few endpoints are available, there
48  *        is no mechanism to reuse endpoints to talk to multiple devices.
49  *
50  *        RESULT:  At one extreme, bandwidth can be overcommitted in
51  *        some hardware configurations, no faults will be reported.
52  *        At the other extreme, the bandwidth capabilities which do
53  *        exist tend to be severely undercommitted.  You can't yet hook
54  *        up both a keyboard and a mouse to an external USB hub.
55  */
56 
57 /*
58  * This gets many kinds of configuration information:
59  *	- Kconfig for everything user-configurable
60  *	- platform_device for addressing, irq, and platform_data
61  *	- platform_data is mostly for board-specific information
62  *	  (plus recentrly, SOC or family details)
63  *
64  * Most of the conditional compilation will (someday) vanish.
65  */
66 
67 #include <linux/module.h>
68 #include <linux/kernel.h>
69 #include <linux/sched.h>
70 #include <linux/slab.h>
71 #include <linux/list.h>
72 #include <linux/kobject.h>
73 #include <linux/prefetch.h>
74 #include <linux/platform_device.h>
75 #include <linux/io.h>
76 #include <linux/iopoll.h>
77 #include <linux/dma-mapping.h>
78 #include <linux/usb.h>
79 #include <linux/usb/of.h>
80 
81 #include "musb_core.h"
82 #include "musb_trace.h"
83 
84 #define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON)
85 
86 
87 #define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia"
88 #define DRIVER_DESC "Inventra Dual-Role USB Controller Driver"
89 
90 #define MUSB_VERSION "6.0"
91 
92 #define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION
93 
94 #define MUSB_DRIVER_NAME "musb-hdrc"
95 const char musb_driver_name[] = MUSB_DRIVER_NAME;
96 
97 MODULE_DESCRIPTION(DRIVER_INFO);
98 MODULE_AUTHOR(DRIVER_AUTHOR);
99 MODULE_LICENSE("GPL");
100 MODULE_ALIAS("platform:" MUSB_DRIVER_NAME);
101 
102 
103 /*-------------------------------------------------------------------------*/
104 
dev_to_musb(struct device * dev)105 static inline struct musb *dev_to_musb(struct device *dev)
106 {
107 	return dev_get_drvdata(dev);
108 }
109 
musb_get_mode(struct device * dev)110 enum musb_mode musb_get_mode(struct device *dev)
111 {
112 	enum usb_dr_mode mode;
113 
114 	mode = usb_get_dr_mode(dev);
115 	switch (mode) {
116 	case USB_DR_MODE_HOST:
117 		return MUSB_HOST;
118 	case USB_DR_MODE_PERIPHERAL:
119 		return MUSB_PERIPHERAL;
120 	case USB_DR_MODE_OTG:
121 	case USB_DR_MODE_UNKNOWN:
122 	default:
123 		return MUSB_OTG;
124 	}
125 }
126 EXPORT_SYMBOL_GPL(musb_get_mode);
127 
128 /*-------------------------------------------------------------------------*/
129 
musb_ulpi_read(struct usb_phy * phy,u32 reg)130 static int musb_ulpi_read(struct usb_phy *phy, u32 reg)
131 {
132 	void __iomem *addr = phy->io_priv;
133 	int	i = 0;
134 	u8	r;
135 	u8	power;
136 	int	ret;
137 
138 	pm_runtime_get_sync(phy->io_dev);
139 
140 	/* Make sure the transceiver is not in low power mode */
141 	power = musb_readb(addr, MUSB_POWER);
142 	power &= ~MUSB_POWER_SUSPENDM;
143 	musb_writeb(addr, MUSB_POWER, power);
144 
145 	/* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the
146 	 * ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM.
147 	 */
148 
149 	musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
150 	musb_writeb(addr, MUSB_ULPI_REG_CONTROL,
151 			MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR);
152 
153 	while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
154 				& MUSB_ULPI_REG_CMPLT)) {
155 		i++;
156 		if (i == 10000) {
157 			ret = -ETIMEDOUT;
158 			goto out;
159 		}
160 
161 	}
162 	r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
163 	r &= ~MUSB_ULPI_REG_CMPLT;
164 	musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
165 
166 	ret = musb_readb(addr, MUSB_ULPI_REG_DATA);
167 
168 out:
169 	pm_runtime_put(phy->io_dev);
170 
171 	return ret;
172 }
173 
musb_ulpi_write(struct usb_phy * phy,u32 val,u32 reg)174 static int musb_ulpi_write(struct usb_phy *phy, u32 val, u32 reg)
175 {
176 	void __iomem *addr = phy->io_priv;
177 	int	i = 0;
178 	u8	r = 0;
179 	u8	power;
180 	int	ret = 0;
181 
182 	pm_runtime_get_sync(phy->io_dev);
183 
184 	/* Make sure the transceiver is not in low power mode */
185 	power = musb_readb(addr, MUSB_POWER);
186 	power &= ~MUSB_POWER_SUSPENDM;
187 	musb_writeb(addr, MUSB_POWER, power);
188 
189 	musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg);
190 	musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)val);
191 	musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ);
192 
193 	while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
194 				& MUSB_ULPI_REG_CMPLT)) {
195 		i++;
196 		if (i == 10000) {
197 			ret = -ETIMEDOUT;
198 			goto out;
199 		}
200 	}
201 
202 	r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
203 	r &= ~MUSB_ULPI_REG_CMPLT;
204 	musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);
205 
206 out:
207 	pm_runtime_put(phy->io_dev);
208 
209 	return ret;
210 }
211 
212 static struct usb_phy_io_ops musb_ulpi_access = {
213 	.read = musb_ulpi_read,
214 	.write = musb_ulpi_write,
215 };
216 
217 /*-------------------------------------------------------------------------*/
218 
musb_default_fifo_offset(u8 epnum)219 static u32 musb_default_fifo_offset(u8 epnum)
220 {
221 	return 0x20 + (epnum * 4);
222 }
223 
224 /* "flat" mapping: each endpoint has its own i/o address */
musb_flat_ep_select(void __iomem * mbase,u8 epnum)225 static void musb_flat_ep_select(void __iomem *mbase, u8 epnum)
226 {
227 }
228 
musb_flat_ep_offset(u8 epnum,u16 offset)229 static u32 musb_flat_ep_offset(u8 epnum, u16 offset)
230 {
231 	return 0x100 + (0x10 * epnum) + offset;
232 }
233 
234 /* "indexed" mapping: INDEX register controls register bank select */
musb_indexed_ep_select(void __iomem * mbase,u8 epnum)235 static void musb_indexed_ep_select(void __iomem *mbase, u8 epnum)
236 {
237 	musb_writeb(mbase, MUSB_INDEX, epnum);
238 }
239 
musb_indexed_ep_offset(u8 epnum,u16 offset)240 static u32 musb_indexed_ep_offset(u8 epnum, u16 offset)
241 {
242 	return 0x10 + offset;
243 }
244 
musb_default_busctl_offset(u8 epnum,u16 offset)245 static u32 musb_default_busctl_offset(u8 epnum, u16 offset)
246 {
247 	return 0x80 + (0x08 * epnum) + offset;
248 }
249 
musb_default_readb(void __iomem * addr,u32 offset)250 static u8 musb_default_readb(void __iomem *addr, u32 offset)
251 {
252 	u8 data =  __raw_readb(addr + offset);
253 
254 	trace_musb_readb(__builtin_return_address(0), addr, offset, data);
255 	return data;
256 }
257 
musb_default_writeb(void __iomem * addr,u32 offset,u8 data)258 static void musb_default_writeb(void __iomem *addr, u32 offset, u8 data)
259 {
260 	trace_musb_writeb(__builtin_return_address(0), addr, offset, data);
261 	__raw_writeb(data, addr + offset);
262 }
263 
musb_default_readw(void __iomem * addr,u32 offset)264 static u16 musb_default_readw(void __iomem *addr, u32 offset)
265 {
266 	u16 data = __raw_readw(addr + offset);
267 
268 	trace_musb_readw(__builtin_return_address(0), addr, offset, data);
269 	return data;
270 }
271 
musb_default_writew(void __iomem * addr,u32 offset,u16 data)272 static void musb_default_writew(void __iomem *addr, u32 offset, u16 data)
273 {
274 	trace_musb_writew(__builtin_return_address(0), addr, offset, data);
275 	__raw_writew(data, addr + offset);
276 }
277 
musb_default_get_toggle(struct musb_qh * qh,int is_out)278 static u16 musb_default_get_toggle(struct musb_qh *qh, int is_out)
279 {
280 	void __iomem *epio = qh->hw_ep->regs;
281 	u16 csr;
282 
283 	if (is_out)
284 		csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
285 	else
286 		csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
287 
288 	return csr;
289 }
290 
musb_default_set_toggle(struct musb_qh * qh,int is_out,struct urb * urb)291 static u16 musb_default_set_toggle(struct musb_qh *qh, int is_out,
292 				   struct urb *urb)
293 {
294 	u16 csr;
295 	u16 toggle;
296 
297 	toggle = usb_gettoggle(urb->dev, qh->epnum, is_out);
298 
299 	if (is_out)
300 		csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
301 				| MUSB_TXCSR_H_DATATOGGLE)
302 				: MUSB_TXCSR_CLRDATATOG;
303 	else
304 		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
305 				| MUSB_RXCSR_H_DATATOGGLE) : 0;
306 
307 	return csr;
308 }
309 
310 /*
311  * Load an endpoint's FIFO
312  */
musb_default_write_fifo(struct musb_hw_ep * hw_ep,u16 len,const u8 * src)313 static void musb_default_write_fifo(struct musb_hw_ep *hw_ep, u16 len,
314 				    const u8 *src)
315 {
316 	struct musb *musb = hw_ep->musb;
317 	void __iomem *fifo = hw_ep->fifo;
318 
319 	if (unlikely(len == 0))
320 		return;
321 
322 	prefetch((u8 *)src);
323 
324 	dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
325 			'T', hw_ep->epnum, fifo, len, src);
326 
327 	/* we can't assume unaligned reads work */
328 	if (likely((0x01 & (unsigned long) src) == 0)) {
329 		u16	index = 0;
330 
331 		/* best case is 32bit-aligned source address */
332 		if ((0x02 & (unsigned long) src) == 0) {
333 			if (len >= 4) {
334 				iowrite32_rep(fifo, src + index, len >> 2);
335 				index += len & ~0x03;
336 			}
337 			if (len & 0x02) {
338 				__raw_writew(*(u16 *)&src[index], fifo);
339 				index += 2;
340 			}
341 		} else {
342 			if (len >= 2) {
343 				iowrite16_rep(fifo, src + index, len >> 1);
344 				index += len & ~0x01;
345 			}
346 		}
347 		if (len & 0x01)
348 			__raw_writeb(src[index], fifo);
349 	} else  {
350 		/* byte aligned */
351 		iowrite8_rep(fifo, src, len);
352 	}
353 }
354 
355 /*
356  * Unload an endpoint's FIFO
357  */
musb_default_read_fifo(struct musb_hw_ep * hw_ep,u16 len,u8 * dst)358 static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
359 {
360 	struct musb *musb = hw_ep->musb;
361 	void __iomem *fifo = hw_ep->fifo;
362 
363 	if (unlikely(len == 0))
364 		return;
365 
366 	dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
367 			'R', hw_ep->epnum, fifo, len, dst);
368 
369 	/* we can't assume unaligned writes work */
370 	if (likely((0x01 & (unsigned long) dst) == 0)) {
371 		u16	index = 0;
372 
373 		/* best case is 32bit-aligned destination address */
374 		if ((0x02 & (unsigned long) dst) == 0) {
375 			if (len >= 4) {
376 				ioread32_rep(fifo, dst, len >> 2);
377 				index = len & ~0x03;
378 			}
379 			if (len & 0x02) {
380 				*(u16 *)&dst[index] = __raw_readw(fifo);
381 				index += 2;
382 			}
383 		} else {
384 			if (len >= 2) {
385 				ioread16_rep(fifo, dst, len >> 1);
386 				index = len & ~0x01;
387 			}
388 		}
389 		if (len & 0x01)
390 			dst[index] = __raw_readb(fifo);
391 	} else  {
392 		/* byte aligned */
393 		ioread8_rep(fifo, dst, len);
394 	}
395 }
396 
397 /*
398  * Old style IO functions
399  */
400 u8 (*musb_readb)(void __iomem *addr, u32 offset);
401 EXPORT_SYMBOL_GPL(musb_readb);
402 
403 void (*musb_writeb)(void __iomem *addr, u32 offset, u8 data);
404 EXPORT_SYMBOL_GPL(musb_writeb);
405 
406 u8 (*musb_clearb)(void __iomem *addr, u32 offset);
407 EXPORT_SYMBOL_GPL(musb_clearb);
408 
409 u16 (*musb_readw)(void __iomem *addr, u32 offset);
410 EXPORT_SYMBOL_GPL(musb_readw);
411 
412 void (*musb_writew)(void __iomem *addr, u32 offset, u16 data);
413 EXPORT_SYMBOL_GPL(musb_writew);
414 
415 u16 (*musb_clearw)(void __iomem *addr, u32 offset);
416 EXPORT_SYMBOL_GPL(musb_clearw);
417 
musb_readl(void __iomem * addr,u32 offset)418 u32 musb_readl(void __iomem *addr, u32 offset)
419 {
420 	u32 data = __raw_readl(addr + offset);
421 
422 	trace_musb_readl(__builtin_return_address(0), addr, offset, data);
423 	return data;
424 }
425 EXPORT_SYMBOL_GPL(musb_readl);
426 
musb_writel(void __iomem * addr,u32 offset,u32 data)427 void musb_writel(void __iomem *addr, u32 offset, u32 data)
428 {
429 	trace_musb_writel(__builtin_return_address(0), addr, offset, data);
430 	__raw_writel(data, addr + offset);
431 }
432 EXPORT_SYMBOL_GPL(musb_writel);
433 
434 #ifndef CONFIG_MUSB_PIO_ONLY
435 struct dma_controller *
436 (*musb_dma_controller_create)(struct musb *musb, void __iomem *base);
437 EXPORT_SYMBOL(musb_dma_controller_create);
438 
439 void (*musb_dma_controller_destroy)(struct dma_controller *c);
440 EXPORT_SYMBOL(musb_dma_controller_destroy);
441 #endif
442 
443 /*
444  * New style IO functions
445  */
musb_read_fifo(struct musb_hw_ep * hw_ep,u16 len,u8 * dst)446 void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
447 {
448 	return hw_ep->musb->io.read_fifo(hw_ep, len, dst);
449 }
450 
musb_write_fifo(struct musb_hw_ep * hw_ep,u16 len,const u8 * src)451 void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
452 {
453 	return hw_ep->musb->io.write_fifo(hw_ep, len, src);
454 }
455 
musb_read_devctl(struct musb * musb)456 static u8 musb_read_devctl(struct musb *musb)
457 {
458 	return musb_readb(musb->mregs, MUSB_DEVCTL);
459 }
460 
461 /**
462  * musb_set_host - set and initialize host mode
463  * @musb: musb controller driver data
464  *
465  * At least some musb revisions need to enable devctl session bit in
466  * peripheral mode to switch to host mode. Initializes things to host
467  * mode and sets A_IDLE. SoC glue needs to advance state further
468  * based on phy provided VBUS state.
469  *
470  * Note that the SoC glue code may need to wait for musb to settle
471  * on enable before calling this to avoid babble.
472  */
musb_set_host(struct musb * musb)473 int musb_set_host(struct musb *musb)
474 {
475 	int error = 0;
476 	u8 devctl;
477 
478 	if (!musb)
479 		return -EINVAL;
480 
481 	devctl = musb_read_devctl(musb);
482 	if (!(devctl & MUSB_DEVCTL_BDEVICE)) {
483 		trace_musb_state(musb, devctl, "Already in host mode");
484 		goto init_data;
485 	}
486 
487 	devctl |= MUSB_DEVCTL_SESSION;
488 	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
489 
490 	error = readx_poll_timeout(musb_read_devctl, musb, devctl,
491 				   !(devctl & MUSB_DEVCTL_BDEVICE), 5000,
492 				   1000000);
493 	if (error) {
494 		dev_err(musb->controller, "%s: could not set host: %02x\n",
495 			__func__, devctl);
496 
497 		return error;
498 	}
499 
500 	devctl = musb_read_devctl(musb);
501 	trace_musb_state(musb, devctl, "Host mode set");
502 
503 init_data:
504 	musb->is_active = 1;
505 	musb_set_state(musb, OTG_STATE_A_IDLE);
506 	MUSB_HST_MODE(musb);
507 
508 	return error;
509 }
510 EXPORT_SYMBOL_GPL(musb_set_host);
511 
512 /**
513  * musb_set_peripheral - set and initialize peripheral mode
514  * @musb: musb controller driver data
515  *
516  * Clears devctl session bit and initializes things for peripheral
517  * mode and sets B_IDLE. SoC glue needs to advance state further
518  * based on phy provided VBUS state.
519  */
musb_set_peripheral(struct musb * musb)520 int musb_set_peripheral(struct musb *musb)
521 {
522 	int error = 0;
523 	u8 devctl;
524 
525 	if (!musb)
526 		return -EINVAL;
527 
528 	devctl = musb_read_devctl(musb);
529 	if (devctl & MUSB_DEVCTL_BDEVICE) {
530 		trace_musb_state(musb, devctl, "Already in peripheral mode");
531 		goto init_data;
532 	}
533 
534 	devctl &= ~MUSB_DEVCTL_SESSION;
535 	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
536 
537 	error = readx_poll_timeout(musb_read_devctl, musb, devctl,
538 				   devctl & MUSB_DEVCTL_BDEVICE, 5000,
539 				   1000000);
540 	if (error) {
541 		dev_err(musb->controller, "%s: could not set peripheral: %02x\n",
542 			__func__, devctl);
543 
544 		return error;
545 	}
546 
547 	devctl = musb_read_devctl(musb);
548 	trace_musb_state(musb, devctl, "Peripheral mode set");
549 
550 init_data:
551 	musb->is_active = 0;
552 	musb_set_state(musb, OTG_STATE_B_IDLE);
553 	MUSB_DEV_MODE(musb);
554 
555 	return error;
556 }
557 EXPORT_SYMBOL_GPL(musb_set_peripheral);
558 
559 /*-------------------------------------------------------------------------*/
560 
561 /* for high speed test mode; see USB 2.0 spec 7.1.20 */
562 static const u8 musb_test_packet[53] = {
563 	/* implicit SYNC then DATA0 to start */
564 
565 	/* JKJKJKJK x9 */
566 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
567 	/* JJKKJJKK x8 */
568 	0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
569 	/* JJJJKKKK x8 */
570 	0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
571 	/* JJJJJJJKKKKKKK x8 */
572 	0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
573 	/* JJJJJJJK x8 */
574 	0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd,
575 	/* JKKKKKKK x10, JK */
576 	0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e
577 
578 	/* implicit CRC16 then EOP to end */
579 };
580 
musb_load_testpacket(struct musb * musb)581 void musb_load_testpacket(struct musb *musb)
582 {
583 	void __iomem	*regs = musb->endpoints[0].regs;
584 
585 	musb_ep_select(musb->mregs, 0);
586 	musb_write_fifo(musb->control_ep,
587 			sizeof(musb_test_packet), musb_test_packet);
588 	musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY);
589 }
590 
591 /*-------------------------------------------------------------------------*/
592 
593 /*
594  * Handles OTG hnp timeouts, such as b_ase0_brst
595  */
musb_otg_timer_func(struct timer_list * t)596 static void musb_otg_timer_func(struct timer_list *t)
597 {
598 	struct musb	*musb = from_timer(musb, t, otg_timer);
599 	unsigned long	flags;
600 
601 	spin_lock_irqsave(&musb->lock, flags);
602 	switch (musb_get_state(musb)) {
603 	case OTG_STATE_B_WAIT_ACON:
604 		musb_dbg(musb,
605 			"HNP: b_wait_acon timeout; back to b_peripheral");
606 		musb_g_disconnect(musb);
607 		musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
608 		musb->is_active = 0;
609 		break;
610 	case OTG_STATE_A_SUSPEND:
611 	case OTG_STATE_A_WAIT_BCON:
612 		musb_dbg(musb, "HNP: %s timeout",
613 			 musb_otg_state_string(musb));
614 		musb_platform_set_vbus(musb, 0);
615 		musb_set_state(musb, OTG_STATE_A_WAIT_VFALL);
616 		break;
617 	default:
618 		musb_dbg(musb, "HNP: Unhandled mode %s",
619 			 musb_otg_state_string(musb));
620 	}
621 	spin_unlock_irqrestore(&musb->lock, flags);
622 }
623 
624 /*
625  * Stops the HNP transition. Caller must take care of locking.
626  */
musb_hnp_stop(struct musb * musb)627 void musb_hnp_stop(struct musb *musb)
628 {
629 	struct usb_hcd	*hcd = musb->hcd;
630 	void __iomem	*mbase = musb->mregs;
631 	u8	reg;
632 
633 	musb_dbg(musb, "HNP: stop from %s", musb_otg_state_string(musb));
634 
635 	switch (musb_get_state(musb)) {
636 	case OTG_STATE_A_PERIPHERAL:
637 		musb_g_disconnect(musb);
638 		musb_dbg(musb, "HNP: back to %s", musb_otg_state_string(musb));
639 		break;
640 	case OTG_STATE_B_HOST:
641 		musb_dbg(musb, "HNP: Disabling HR");
642 		if (hcd)
643 			hcd->self.is_b_host = 0;
644 		musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
645 		MUSB_DEV_MODE(musb);
646 		reg = musb_readb(mbase, MUSB_POWER);
647 		reg |= MUSB_POWER_SUSPENDM;
648 		musb_writeb(mbase, MUSB_POWER, reg);
649 		/* REVISIT: Start SESSION_REQUEST here? */
650 		break;
651 	default:
652 		musb_dbg(musb, "HNP: Stopping in unknown state %s",
653 			 musb_otg_state_string(musb));
654 	}
655 
656 	/*
657 	 * When returning to A state after HNP, avoid hub_port_rebounce(),
658 	 * which cause occasional OPT A "Did not receive reset after connect"
659 	 * errors.
660 	 */
661 	musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16);
662 }
663 
664 static void musb_recover_from_babble(struct musb *musb);
665 
musb_handle_intr_resume(struct musb * musb,u8 devctl)666 static void musb_handle_intr_resume(struct musb *musb, u8 devctl)
667 {
668 	musb_dbg(musb, "RESUME (%s)", musb_otg_state_string(musb));
669 
670 	if (devctl & MUSB_DEVCTL_HM) {
671 		switch (musb_get_state(musb)) {
672 		case OTG_STATE_A_SUSPEND:
673 			/* remote wakeup? */
674 			musb->port1_status |=
675 					(USB_PORT_STAT_C_SUSPEND << 16)
676 					| MUSB_PORT_STAT_RESUME;
677 			musb->rh_timer = jiffies
678 				+ msecs_to_jiffies(USB_RESUME_TIMEOUT);
679 			musb_set_state(musb, OTG_STATE_A_HOST);
680 			musb->is_active = 1;
681 			musb_host_resume_root_hub(musb);
682 			schedule_delayed_work(&musb->finish_resume_work,
683 				msecs_to_jiffies(USB_RESUME_TIMEOUT));
684 			break;
685 		case OTG_STATE_B_WAIT_ACON:
686 			musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
687 			musb->is_active = 1;
688 			MUSB_DEV_MODE(musb);
689 			break;
690 		default:
691 			WARNING("bogus %s RESUME (%s)\n",
692 				"host",
693 				musb_otg_state_string(musb));
694 		}
695 	} else {
696 		switch (musb_get_state(musb)) {
697 		case OTG_STATE_A_SUSPEND:
698 			/* possibly DISCONNECT is upcoming */
699 			musb_set_state(musb, OTG_STATE_A_HOST);
700 			musb_host_resume_root_hub(musb);
701 			break;
702 		case OTG_STATE_B_WAIT_ACON:
703 		case OTG_STATE_B_PERIPHERAL:
704 			/* disconnect while suspended?  we may
705 			 * not get a disconnect irq...
706 			 */
707 			if ((devctl & MUSB_DEVCTL_VBUS)
708 					!= (3 << MUSB_DEVCTL_VBUS_SHIFT)
709 					) {
710 				musb->int_usb |= MUSB_INTR_DISCONNECT;
711 				musb->int_usb &= ~MUSB_INTR_SUSPEND;
712 				break;
713 			}
714 			musb_g_resume(musb);
715 			break;
716 		case OTG_STATE_B_IDLE:
717 			musb->int_usb &= ~MUSB_INTR_SUSPEND;
718 			break;
719 		default:
720 			WARNING("bogus %s RESUME (%s)\n",
721 				"peripheral",
722 				musb_otg_state_string(musb));
723 		}
724 	}
725 }
726 
727 /* return IRQ_HANDLED to tell the caller to return immediately */
musb_handle_intr_sessreq(struct musb * musb,u8 devctl)728 static irqreturn_t musb_handle_intr_sessreq(struct musb *musb, u8 devctl)
729 {
730 	void __iomem *mbase = musb->mregs;
731 
732 	if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS
733 			&& (devctl & MUSB_DEVCTL_BDEVICE)) {
734 		musb_dbg(musb, "SessReq while on B state");
735 		return IRQ_HANDLED;
736 	}
737 
738 	musb_dbg(musb, "SESSION_REQUEST (%s)", musb_otg_state_string(musb));
739 
740 	/* IRQ arrives from ID pin sense or (later, if VBUS power
741 	 * is removed) SRP.  responses are time critical:
742 	 *  - turn on VBUS (with silicon-specific mechanism)
743 	 *  - go through A_WAIT_VRISE
744 	 *  - ... to A_WAIT_BCON.
745 	 * a_wait_vrise_tmout triggers VBUS_ERROR transitions
746 	 */
747 	musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
748 	musb->ep0_stage = MUSB_EP0_START;
749 	musb_set_state(musb, OTG_STATE_A_IDLE);
750 	MUSB_HST_MODE(musb);
751 	musb_platform_set_vbus(musb, 1);
752 
753 	return IRQ_NONE;
754 }
755 
musb_handle_intr_vbuserr(struct musb * musb,u8 devctl)756 static void musb_handle_intr_vbuserr(struct musb *musb, u8 devctl)
757 {
758 	int	ignore = 0;
759 
760 	/* During connection as an A-Device, we may see a short
761 	 * current spikes causing voltage drop, because of cable
762 	 * and peripheral capacitance combined with vbus draw.
763 	 * (So: less common with truly self-powered devices, where
764 	 * vbus doesn't act like a power supply.)
765 	 *
766 	 * Such spikes are short; usually less than ~500 usec, max
767 	 * of ~2 msec.  That is, they're not sustained overcurrent
768 	 * errors, though they're reported using VBUSERROR irqs.
769 	 *
770 	 * Workarounds:  (a) hardware: use self powered devices.
771 	 * (b) software:  ignore non-repeated VBUS errors.
772 	 *
773 	 * REVISIT:  do delays from lots of DEBUG_KERNEL checks
774 	 * make trouble here, keeping VBUS < 4.4V ?
775 	 */
776 	switch (musb_get_state(musb)) {
777 	case OTG_STATE_A_HOST:
778 		/* recovery is dicey once we've gotten past the
779 		 * initial stages of enumeration, but if VBUS
780 		 * stayed ok at the other end of the link, and
781 		 * another reset is due (at least for high speed,
782 		 * to redo the chirp etc), it might work OK...
783 		 */
784 	case OTG_STATE_A_WAIT_BCON:
785 	case OTG_STATE_A_WAIT_VRISE:
786 		if (musb->vbuserr_retry) {
787 			void __iomem *mbase = musb->mregs;
788 
789 			musb->vbuserr_retry--;
790 			ignore = 1;
791 			devctl |= MUSB_DEVCTL_SESSION;
792 			musb_writeb(mbase, MUSB_DEVCTL, devctl);
793 		} else {
794 			musb->port1_status |=
795 				  USB_PORT_STAT_OVERCURRENT
796 				| (USB_PORT_STAT_C_OVERCURRENT << 16);
797 		}
798 		break;
799 	default:
800 		break;
801 	}
802 
803 	dev_printk(ignore ? KERN_DEBUG : KERN_ERR, musb->controller,
804 			"VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n",
805 			musb_otg_state_string(musb),
806 			devctl,
807 			({ char *s;
808 			switch (devctl & MUSB_DEVCTL_VBUS) {
809 			case 0 << MUSB_DEVCTL_VBUS_SHIFT:
810 				s = "<SessEnd"; break;
811 			case 1 << MUSB_DEVCTL_VBUS_SHIFT:
812 				s = "<AValid"; break;
813 			case 2 << MUSB_DEVCTL_VBUS_SHIFT:
814 				s = "<VBusValid"; break;
815 			/* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */
816 			default:
817 				s = "VALID"; break;
818 			} s; }),
819 			VBUSERR_RETRY_COUNT - musb->vbuserr_retry,
820 			musb->port1_status);
821 
822 	/* go through A_WAIT_VFALL then start a new session */
823 	if (!ignore)
824 		musb_platform_set_vbus(musb, 0);
825 }
826 
musb_handle_intr_suspend(struct musb * musb,u8 devctl)827 static void musb_handle_intr_suspend(struct musb *musb, u8 devctl)
828 {
829 	musb_dbg(musb, "SUSPEND (%s) devctl %02x",
830 		 musb_otg_state_string(musb), devctl);
831 
832 	switch (musb_get_state(musb)) {
833 	case OTG_STATE_A_PERIPHERAL:
834 		/* We also come here if the cable is removed, since
835 		 * this silicon doesn't report ID-no-longer-grounded.
836 		 *
837 		 * We depend on T(a_wait_bcon) to shut us down, and
838 		 * hope users don't do anything dicey during this
839 		 * undesired detour through A_WAIT_BCON.
840 		 */
841 		musb_hnp_stop(musb);
842 		musb_host_resume_root_hub(musb);
843 		musb_root_disconnect(musb);
844 		musb_platform_try_idle(musb, jiffies
845 				+ msecs_to_jiffies(musb->a_wait_bcon
846 					? : OTG_TIME_A_WAIT_BCON));
847 
848 		break;
849 	case OTG_STATE_B_IDLE:
850 		if (!musb->is_active)
851 			break;
852 		fallthrough;
853 	case OTG_STATE_B_PERIPHERAL:
854 		musb_g_suspend(musb);
855 		musb->is_active = musb->g.b_hnp_enable;
856 		if (musb->is_active) {
857 			musb_set_state(musb, OTG_STATE_B_WAIT_ACON);
858 			musb_dbg(musb, "HNP: Setting timer for b_ase0_brst");
859 			mod_timer(&musb->otg_timer, jiffies
860 				+ msecs_to_jiffies(
861 						OTG_TIME_B_ASE0_BRST));
862 		}
863 		break;
864 	case OTG_STATE_A_WAIT_BCON:
865 		if (musb->a_wait_bcon != 0)
866 			musb_platform_try_idle(musb, jiffies
867 				+ msecs_to_jiffies(musb->a_wait_bcon));
868 		break;
869 	case OTG_STATE_A_HOST:
870 		musb_set_state(musb, OTG_STATE_A_SUSPEND);
871 		musb->is_active = musb->hcd->self.b_hnp_enable;
872 		break;
873 	case OTG_STATE_B_HOST:
874 		/* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */
875 		musb_dbg(musb, "REVISIT: SUSPEND as B_HOST");
876 		break;
877 	default:
878 		/* "should not happen" */
879 		musb->is_active = 0;
880 		break;
881 	}
882 }
883 
musb_handle_intr_connect(struct musb * musb,u8 devctl,u8 int_usb)884 static void musb_handle_intr_connect(struct musb *musb, u8 devctl, u8 int_usb)
885 {
886 	struct usb_hcd *hcd = musb->hcd;
887 
888 	musb->is_active = 1;
889 	musb->ep0_stage = MUSB_EP0_START;
890 
891 	musb->intrtxe = musb->epmask;
892 	musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe);
893 	musb->intrrxe = musb->epmask & 0xfffe;
894 	musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe);
895 	musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7);
896 	musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED
897 				|USB_PORT_STAT_HIGH_SPEED
898 				|USB_PORT_STAT_ENABLE
899 				);
900 	musb->port1_status |= USB_PORT_STAT_CONNECTION
901 				|(USB_PORT_STAT_C_CONNECTION << 16);
902 
903 	/* high vs full speed is just a guess until after reset */
904 	if (devctl & MUSB_DEVCTL_LSDEV)
905 		musb->port1_status |= USB_PORT_STAT_LOW_SPEED;
906 
907 	/* indicate new connection to OTG machine */
908 	switch (musb_get_state(musb)) {
909 	case OTG_STATE_B_PERIPHERAL:
910 		if (int_usb & MUSB_INTR_SUSPEND) {
911 			musb_dbg(musb, "HNP: SUSPEND+CONNECT, now b_host");
912 			int_usb &= ~MUSB_INTR_SUSPEND;
913 			goto b_host;
914 		} else
915 			musb_dbg(musb, "CONNECT as b_peripheral???");
916 		break;
917 	case OTG_STATE_B_WAIT_ACON:
918 		musb_dbg(musb, "HNP: CONNECT, now b_host");
919 b_host:
920 		musb_set_state(musb, OTG_STATE_B_HOST);
921 		if (musb->hcd)
922 			musb->hcd->self.is_b_host = 1;
923 		del_timer(&musb->otg_timer);
924 		break;
925 	default:
926 		if ((devctl & MUSB_DEVCTL_VBUS)
927 				== (3 << MUSB_DEVCTL_VBUS_SHIFT)) {
928 			musb_set_state(musb, OTG_STATE_A_HOST);
929 			if (hcd)
930 				hcd->self.is_b_host = 0;
931 		}
932 		break;
933 	}
934 
935 	musb_host_poke_root_hub(musb);
936 
937 	musb_dbg(musb, "CONNECT (%s) devctl %02x",
938 			musb_otg_state_string(musb), devctl);
939 }
940 
musb_handle_intr_disconnect(struct musb * musb,u8 devctl)941 static void musb_handle_intr_disconnect(struct musb *musb, u8 devctl)
942 {
943 	musb_dbg(musb, "DISCONNECT (%s) as %s, devctl %02x",
944 			musb_otg_state_string(musb),
945 			MUSB_MODE(musb), devctl);
946 
947 	switch (musb_get_state(musb)) {
948 	case OTG_STATE_A_HOST:
949 	case OTG_STATE_A_SUSPEND:
950 		musb_host_resume_root_hub(musb);
951 		musb_root_disconnect(musb);
952 		if (musb->a_wait_bcon != 0)
953 			musb_platform_try_idle(musb, jiffies
954 				+ msecs_to_jiffies(musb->a_wait_bcon));
955 		break;
956 	case OTG_STATE_B_HOST:
957 		/* REVISIT this behaves for "real disconnect"
958 		 * cases; make sure the other transitions from
959 		 * from B_HOST act right too.  The B_HOST code
960 		 * in hnp_stop() is currently not used...
961 		 */
962 		musb_root_disconnect(musb);
963 		if (musb->hcd)
964 			musb->hcd->self.is_b_host = 0;
965 		musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
966 		MUSB_DEV_MODE(musb);
967 		musb_g_disconnect(musb);
968 		break;
969 	case OTG_STATE_A_PERIPHERAL:
970 		musb_hnp_stop(musb);
971 		musb_root_disconnect(musb);
972 		fallthrough;
973 	case OTG_STATE_B_WAIT_ACON:
974 	case OTG_STATE_B_PERIPHERAL:
975 	case OTG_STATE_B_IDLE:
976 		musb_g_disconnect(musb);
977 		break;
978 	default:
979 		WARNING("unhandled DISCONNECT transition (%s)\n",
980 			musb_otg_state_string(musb));
981 		break;
982 	}
983 }
984 
985 /*
986  * mentor saves a bit: bus reset and babble share the same irq.
987  * only host sees babble; only peripheral sees bus reset.
988  */
musb_handle_intr_reset(struct musb * musb)989 static void musb_handle_intr_reset(struct musb *musb)
990 {
991 	if (is_host_active(musb)) {
992 		/*
993 		 * When BABBLE happens what we can depends on which
994 		 * platform MUSB is running, because some platforms
995 		 * implemented proprietary means for 'recovering' from
996 		 * Babble conditions. One such platform is AM335x. In
997 		 * most cases, however, the only thing we can do is
998 		 * drop the session.
999 		 */
1000 		dev_err(musb->controller, "Babble\n");
1001 		musb_recover_from_babble(musb);
1002 	} else {
1003 		musb_dbg(musb, "BUS RESET as %s", musb_otg_state_string(musb));
1004 		switch (musb_get_state(musb)) {
1005 		case OTG_STATE_A_SUSPEND:
1006 			musb_g_reset(musb);
1007 			fallthrough;
1008 		case OTG_STATE_A_WAIT_BCON:	/* OPT TD.4.7-900ms */
1009 			/* never use invalid T(a_wait_bcon) */
1010 			musb_dbg(musb, "HNP: in %s, %d msec timeout",
1011 				 musb_otg_state_string(musb),
1012 				TA_WAIT_BCON(musb));
1013 			mod_timer(&musb->otg_timer, jiffies
1014 				+ msecs_to_jiffies(TA_WAIT_BCON(musb)));
1015 			break;
1016 		case OTG_STATE_A_PERIPHERAL:
1017 			del_timer(&musb->otg_timer);
1018 			musb_g_reset(musb);
1019 			break;
1020 		case OTG_STATE_B_WAIT_ACON:
1021 			musb_dbg(musb, "HNP: RESET (%s), to b_peripheral",
1022 				 musb_otg_state_string(musb));
1023 			musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
1024 			musb_g_reset(musb);
1025 			break;
1026 		case OTG_STATE_B_IDLE:
1027 			musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
1028 			fallthrough;
1029 		case OTG_STATE_B_PERIPHERAL:
1030 			musb_g_reset(musb);
1031 			break;
1032 		default:
1033 			musb_dbg(musb, "Unhandled BUS RESET as %s",
1034 				 musb_otg_state_string(musb));
1035 		}
1036 	}
1037 }
1038 
1039 /*
1040  * Interrupt Service Routine to record USB "global" interrupts.
1041  * Since these do not happen often and signify things of
1042  * paramount importance, it seems OK to check them individually;
1043  * the order of the tests is specified in the manual
1044  *
1045  * @param musb instance pointer
1046  * @param int_usb register contents
1047  * @param devctl
1048  */
1049 
musb_stage0_irq(struct musb * musb,u8 int_usb,u8 devctl)1050 static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
1051 				u8 devctl)
1052 {
1053 	irqreturn_t handled = IRQ_NONE;
1054 
1055 	musb_dbg(musb, "<== DevCtl=%02x, int_usb=0x%x", devctl, int_usb);
1056 
1057 	/* in host mode, the peripheral may issue remote wakeup.
1058 	 * in peripheral mode, the host may resume the link.
1059 	 * spurious RESUME irqs happen too, paired with SUSPEND.
1060 	 */
1061 	if (int_usb & MUSB_INTR_RESUME) {
1062 		musb_handle_intr_resume(musb, devctl);
1063 		handled = IRQ_HANDLED;
1064 	}
1065 
1066 	/* see manual for the order of the tests */
1067 	if (int_usb & MUSB_INTR_SESSREQ) {
1068 		if (musb_handle_intr_sessreq(musb, devctl))
1069 			return IRQ_HANDLED;
1070 		handled = IRQ_HANDLED;
1071 	}
1072 
1073 	if (int_usb & MUSB_INTR_VBUSERROR) {
1074 		musb_handle_intr_vbuserr(musb, devctl);
1075 		handled = IRQ_HANDLED;
1076 	}
1077 
1078 	if (int_usb & MUSB_INTR_SUSPEND) {
1079 		musb_handle_intr_suspend(musb, devctl);
1080 		handled = IRQ_HANDLED;
1081 	}
1082 
1083 	if (int_usb & MUSB_INTR_CONNECT) {
1084 		musb_handle_intr_connect(musb, devctl, int_usb);
1085 		handled = IRQ_HANDLED;
1086 	}
1087 
1088 	if (int_usb & MUSB_INTR_DISCONNECT) {
1089 		musb_handle_intr_disconnect(musb, devctl);
1090 		handled = IRQ_HANDLED;
1091 	}
1092 
1093 	if (int_usb & MUSB_INTR_RESET) {
1094 		musb_handle_intr_reset(musb);
1095 		handled = IRQ_HANDLED;
1096 	}
1097 
1098 #if 0
1099 /* REVISIT ... this would be for multiplexing periodic endpoints, or
1100  * supporting transfer phasing to prevent exceeding ISO bandwidth
1101  * limits of a given frame or microframe.
1102  *
1103  * It's not needed for peripheral side, which dedicates endpoints;
1104  * though it _might_ use SOF irqs for other purposes.
1105  *
1106  * And it's not currently needed for host side, which also dedicates
1107  * endpoints, relies on TX/RX interval registers, and isn't claimed
1108  * to support ISO transfers yet.
1109  */
1110 	if (int_usb & MUSB_INTR_SOF) {
1111 		void __iomem *mbase = musb->mregs;
1112 		struct musb_hw_ep	*ep;
1113 		u8 epnum;
1114 		u16 frame;
1115 
1116 		dev_dbg(musb->controller, "START_OF_FRAME\n");
1117 		handled = IRQ_HANDLED;
1118 
1119 		/* start any periodic Tx transfers waiting for current frame */
1120 		frame = musb_readw(mbase, MUSB_FRAME);
1121 		ep = musb->endpoints;
1122 		for (epnum = 1; (epnum < musb->nr_endpoints)
1123 					&& (musb->epmask >= (1 << epnum));
1124 				epnum++, ep++) {
1125 			/*
1126 			 * FIXME handle framecounter wraps (12 bits)
1127 			 * eliminate duplicated StartUrb logic
1128 			 */
1129 			if (ep->dwWaitFrame >= frame) {
1130 				ep->dwWaitFrame = 0;
1131 				pr_debug("SOF --> periodic TX%s on %d\n",
1132 					ep->tx_channel ? " DMA" : "",
1133 					epnum);
1134 				if (!ep->tx_channel)
1135 					musb_h_tx_start(musb, epnum);
1136 				else
1137 					cppi_hostdma_start(musb, epnum);
1138 			}
1139 		}		/* end of for loop */
1140 	}
1141 #endif
1142 
1143 	schedule_delayed_work(&musb->irq_work, 0);
1144 
1145 	return handled;
1146 }
1147 
1148 /*-------------------------------------------------------------------------*/
1149 
musb_disable_interrupts(struct musb * musb)1150 static void musb_disable_interrupts(struct musb *musb)
1151 {
1152 	void __iomem	*mbase = musb->mregs;
1153 
1154 	/* disable interrupts */
1155 	musb_writeb(mbase, MUSB_INTRUSBE, 0);
1156 	musb->intrtxe = 0;
1157 	musb_writew(mbase, MUSB_INTRTXE, 0);
1158 	musb->intrrxe = 0;
1159 	musb_writew(mbase, MUSB_INTRRXE, 0);
1160 
1161 	/*  flush pending interrupts */
1162 	musb_clearb(mbase, MUSB_INTRUSB);
1163 	musb_clearw(mbase, MUSB_INTRTX);
1164 	musb_clearw(mbase, MUSB_INTRRX);
1165 }
1166 
musb_enable_interrupts(struct musb * musb)1167 static void musb_enable_interrupts(struct musb *musb)
1168 {
1169 	void __iomem    *regs = musb->mregs;
1170 
1171 	/*  Set INT enable registers, enable interrupts */
1172 	musb->intrtxe = musb->epmask;
1173 	musb_writew(regs, MUSB_INTRTXE, musb->intrtxe);
1174 	musb->intrrxe = musb->epmask & 0xfffe;
1175 	musb_writew(regs, MUSB_INTRRXE, musb->intrrxe);
1176 	musb_writeb(regs, MUSB_INTRUSBE, 0xf7);
1177 
1178 }
1179 
1180 /*
1181  * Program the HDRC to start (enable interrupts, dma, etc.).
1182  */
musb_start(struct musb * musb)1183 void musb_start(struct musb *musb)
1184 {
1185 	void __iomem    *regs = musb->mregs;
1186 	u8              devctl = musb_readb(regs, MUSB_DEVCTL);
1187 	u8		power;
1188 
1189 	musb_dbg(musb, "<== devctl %02x", devctl);
1190 
1191 	musb_enable_interrupts(musb);
1192 	musb_writeb(regs, MUSB_TESTMODE, 0);
1193 
1194 	power = MUSB_POWER_ISOUPDATE;
1195 	/*
1196 	 * treating UNKNOWN as unspecified maximum speed, in which case
1197 	 * we will default to high-speed.
1198 	 */
1199 	if (musb->config->maximum_speed == USB_SPEED_HIGH ||
1200 			musb->config->maximum_speed == USB_SPEED_UNKNOWN)
1201 		power |= MUSB_POWER_HSENAB;
1202 	musb_writeb(regs, MUSB_POWER, power);
1203 
1204 	musb->is_active = 0;
1205 	devctl = musb_readb(regs, MUSB_DEVCTL);
1206 	devctl &= ~MUSB_DEVCTL_SESSION;
1207 
1208 	/* session started after:
1209 	 * (a) ID-grounded irq, host mode;
1210 	 * (b) vbus present/connect IRQ, peripheral mode;
1211 	 * (c) peripheral initiates, using SRP
1212 	 */
1213 	if (musb->port_mode != MUSB_HOST &&
1214 	    musb_get_state(musb) != OTG_STATE_A_WAIT_BCON &&
1215 	    (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) {
1216 		musb->is_active = 1;
1217 	} else {
1218 		devctl |= MUSB_DEVCTL_SESSION;
1219 	}
1220 
1221 	musb_platform_enable(musb);
1222 	musb_writeb(regs, MUSB_DEVCTL, devctl);
1223 }
1224 
1225 /*
1226  * Make the HDRC stop (disable interrupts, etc.);
1227  * reversible by musb_start
1228  * called on gadget driver unregister
1229  * with controller locked, irqs blocked
1230  * acts as a NOP unless some role activated the hardware
1231  */
musb_stop(struct musb * musb)1232 void musb_stop(struct musb *musb)
1233 {
1234 	/* stop IRQs, timers, ... */
1235 	musb_platform_disable(musb);
1236 	musb_disable_interrupts(musb);
1237 	musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
1238 
1239 	/* FIXME
1240 	 *  - mark host and/or peripheral drivers unusable/inactive
1241 	 *  - disable DMA (and enable it in HdrcStart)
1242 	 *  - make sure we can musb_start() after musb_stop(); with
1243 	 *    OTG mode, gadget driver module rmmod/modprobe cycles that
1244 	 *  - ...
1245 	 */
1246 	musb_platform_try_idle(musb, 0);
1247 }
1248 
1249 /*-------------------------------------------------------------------------*/
1250 
1251 /*
1252  * The silicon either has hard-wired endpoint configurations, or else
1253  * "dynamic fifo" sizing.  The driver has support for both, though at this
1254  * writing only the dynamic sizing is very well tested.   Since we switched
1255  * away from compile-time hardware parameters, we can no longer rely on
1256  * dead code elimination to leave only the relevant one in the object file.
1257  *
1258  * We don't currently use dynamic fifo setup capability to do anything
1259  * more than selecting one of a bunch of predefined configurations.
1260  */
1261 static ushort fifo_mode;
1262 
1263 /* "modprobe ... fifo_mode=1" etc */
1264 module_param(fifo_mode, ushort, 0);
1265 MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration");
1266 
1267 /*
1268  * tables defining fifo_mode values.  define more if you like.
1269  * for host side, make sure both halves of ep1 are set up.
1270  */
1271 
1272 /* mode 0 - fits in 2KB */
1273 static struct musb_fifo_cfg mode_0_cfg[] = {
1274 { .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, },
1275 { .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, },
1276 { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, },
1277 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1278 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1279 };
1280 
1281 /* mode 1 - fits in 4KB */
1282 static struct musb_fifo_cfg mode_1_cfg[] = {
1283 { .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
1284 { .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
1285 { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, },
1286 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1287 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1288 };
1289 
1290 /* mode 2 - fits in 4KB */
1291 static struct musb_fifo_cfg mode_2_cfg[] = {
1292 { .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, },
1293 { .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, },
1294 { .hw_ep_num = 2, .style = FIFO_TX,   .maxpacket = 512, },
1295 { .hw_ep_num = 2, .style = FIFO_RX,   .maxpacket = 512, },
1296 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 960, },
1297 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 1024, },
1298 };
1299 
1300 /* mode 3 - fits in 4KB */
1301 static struct musb_fifo_cfg mode_3_cfg[] = {
1302 { .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
1303 { .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
1304 { .hw_ep_num = 2, .style = FIFO_TX,   .maxpacket = 512, },
1305 { .hw_ep_num = 2, .style = FIFO_RX,   .maxpacket = 512, },
1306 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
1307 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
1308 };
1309 
1310 /* mode 4 - fits in 16KB */
1311 static struct musb_fifo_cfg mode_4_cfg[] = {
1312 { .hw_ep_num =  1, .style = FIFO_TX,   .maxpacket = 512, },
1313 { .hw_ep_num =  1, .style = FIFO_RX,   .maxpacket = 512, },
1314 { .hw_ep_num =  2, .style = FIFO_TX,   .maxpacket = 512, },
1315 { .hw_ep_num =  2, .style = FIFO_RX,   .maxpacket = 512, },
1316 { .hw_ep_num =  3, .style = FIFO_TX,   .maxpacket = 512, },
1317 { .hw_ep_num =  3, .style = FIFO_RX,   .maxpacket = 512, },
1318 { .hw_ep_num =  4, .style = FIFO_TX,   .maxpacket = 512, },
1319 { .hw_ep_num =  4, .style = FIFO_RX,   .maxpacket = 512, },
1320 { .hw_ep_num =  5, .style = FIFO_TX,   .maxpacket = 512, },
1321 { .hw_ep_num =  5, .style = FIFO_RX,   .maxpacket = 512, },
1322 { .hw_ep_num =  6, .style = FIFO_TX,   .maxpacket = 512, },
1323 { .hw_ep_num =  6, .style = FIFO_RX,   .maxpacket = 512, },
1324 { .hw_ep_num =  7, .style = FIFO_TX,   .maxpacket = 512, },
1325 { .hw_ep_num =  7, .style = FIFO_RX,   .maxpacket = 512, },
1326 { .hw_ep_num =  8, .style = FIFO_TX,   .maxpacket = 512, },
1327 { .hw_ep_num =  8, .style = FIFO_RX,   .maxpacket = 512, },
1328 { .hw_ep_num =  9, .style = FIFO_TX,   .maxpacket = 512, },
1329 { .hw_ep_num =  9, .style = FIFO_RX,   .maxpacket = 512, },
1330 { .hw_ep_num = 10, .style = FIFO_TX,   .maxpacket = 256, },
1331 { .hw_ep_num = 10, .style = FIFO_RX,   .maxpacket = 64, },
1332 { .hw_ep_num = 11, .style = FIFO_TX,   .maxpacket = 256, },
1333 { .hw_ep_num = 11, .style = FIFO_RX,   .maxpacket = 64, },
1334 { .hw_ep_num = 12, .style = FIFO_TX,   .maxpacket = 256, },
1335 { .hw_ep_num = 12, .style = FIFO_RX,   .maxpacket = 64, },
1336 { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, },
1337 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1338 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1339 };
1340 
1341 /* mode 5 - fits in 8KB */
1342 static struct musb_fifo_cfg mode_5_cfg[] = {
1343 { .hw_ep_num =  1, .style = FIFO_TX,   .maxpacket = 512, },
1344 { .hw_ep_num =  1, .style = FIFO_RX,   .maxpacket = 512, },
1345 { .hw_ep_num =  2, .style = FIFO_TX,   .maxpacket = 512, },
1346 { .hw_ep_num =  2, .style = FIFO_RX,   .maxpacket = 512, },
1347 { .hw_ep_num =  3, .style = FIFO_TX,   .maxpacket = 512, },
1348 { .hw_ep_num =  3, .style = FIFO_RX,   .maxpacket = 512, },
1349 { .hw_ep_num =  4, .style = FIFO_TX,   .maxpacket = 512, },
1350 { .hw_ep_num =  4, .style = FIFO_RX,   .maxpacket = 512, },
1351 { .hw_ep_num =  5, .style = FIFO_TX,   .maxpacket = 512, },
1352 { .hw_ep_num =  5, .style = FIFO_RX,   .maxpacket = 512, },
1353 { .hw_ep_num =  6, .style = FIFO_TX,   .maxpacket = 32, },
1354 { .hw_ep_num =  6, .style = FIFO_RX,   .maxpacket = 32, },
1355 { .hw_ep_num =  7, .style = FIFO_TX,   .maxpacket = 32, },
1356 { .hw_ep_num =  7, .style = FIFO_RX,   .maxpacket = 32, },
1357 { .hw_ep_num =  8, .style = FIFO_TX,   .maxpacket = 32, },
1358 { .hw_ep_num =  8, .style = FIFO_RX,   .maxpacket = 32, },
1359 { .hw_ep_num =  9, .style = FIFO_TX,   .maxpacket = 32, },
1360 { .hw_ep_num =  9, .style = FIFO_RX,   .maxpacket = 32, },
1361 { .hw_ep_num = 10, .style = FIFO_TX,   .maxpacket = 32, },
1362 { .hw_ep_num = 10, .style = FIFO_RX,   .maxpacket = 32, },
1363 { .hw_ep_num = 11, .style = FIFO_TX,   .maxpacket = 32, },
1364 { .hw_ep_num = 11, .style = FIFO_RX,   .maxpacket = 32, },
1365 { .hw_ep_num = 12, .style = FIFO_TX,   .maxpacket = 32, },
1366 { .hw_ep_num = 12, .style = FIFO_RX,   .maxpacket = 32, },
1367 { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, },
1368 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
1369 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
1370 };
1371 
1372 /*
1373  * configure a fifo; for non-shared endpoints, this may be called
1374  * once for a tx fifo and once for an rx fifo.
1375  *
1376  * returns negative errno or offset for next fifo.
1377  */
1378 static int
fifo_setup(struct musb * musb,struct musb_hw_ep * hw_ep,const struct musb_fifo_cfg * cfg,u16 offset)1379 fifo_setup(struct musb *musb, struct musb_hw_ep  *hw_ep,
1380 		const struct musb_fifo_cfg *cfg, u16 offset)
1381 {
1382 	void __iomem	*mbase = musb->mregs;
1383 	int	size = 0;
1384 	u16	maxpacket = cfg->maxpacket;
1385 	u16	c_off = offset >> 3;
1386 	u8	c_size;
1387 
1388 	/* expect hw_ep has already been zero-initialized */
1389 
1390 	size = ffs(max(maxpacket, (u16) 8)) - 1;
1391 	maxpacket = 1 << size;
1392 
1393 	c_size = size - 3;
1394 	if (cfg->mode == BUF_DOUBLE) {
1395 		if ((offset + (maxpacket << 1)) >
1396 				(1 << (musb->config->ram_bits + 2)))
1397 			return -EMSGSIZE;
1398 		c_size |= MUSB_FIFOSZ_DPB;
1399 	} else {
1400 		if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2)))
1401 			return -EMSGSIZE;
1402 	}
1403 
1404 	/* configure the FIFO */
1405 	musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum);
1406 
1407 	/* EP0 reserved endpoint for control, bidirectional;
1408 	 * EP1 reserved for bulk, two unidirectional halves.
1409 	 */
1410 	if (hw_ep->epnum == 1)
1411 		musb->bulk_ep = hw_ep;
1412 	/* REVISIT error check:  be sure ep0 can both rx and tx ... */
1413 	switch (cfg->style) {
1414 	case FIFO_TX:
1415 		musb_writeb(mbase, MUSB_TXFIFOSZ, c_size);
1416 		musb_writew(mbase, MUSB_TXFIFOADD, c_off);
1417 		hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1418 		hw_ep->max_packet_sz_tx = maxpacket;
1419 		break;
1420 	case FIFO_RX:
1421 		musb_writeb(mbase, MUSB_RXFIFOSZ, c_size);
1422 		musb_writew(mbase, MUSB_RXFIFOADD, c_off);
1423 		hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1424 		hw_ep->max_packet_sz_rx = maxpacket;
1425 		break;
1426 	case FIFO_RXTX:
1427 		musb_writeb(mbase, MUSB_TXFIFOSZ, c_size);
1428 		musb_writew(mbase, MUSB_TXFIFOADD, c_off);
1429 		hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
1430 		hw_ep->max_packet_sz_rx = maxpacket;
1431 
1432 		musb_writeb(mbase, MUSB_RXFIFOSZ, c_size);
1433 		musb_writew(mbase, MUSB_RXFIFOADD, c_off);
1434 		hw_ep->tx_double_buffered = hw_ep->rx_double_buffered;
1435 		hw_ep->max_packet_sz_tx = maxpacket;
1436 
1437 		hw_ep->is_shared_fifo = true;
1438 		break;
1439 	}
1440 
1441 	/* NOTE rx and tx endpoint irqs aren't managed separately,
1442 	 * which happens to be ok
1443 	 */
1444 	musb->epmask |= (1 << hw_ep->epnum);
1445 
1446 	return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0));
1447 }
1448 
1449 static struct musb_fifo_cfg ep0_cfg = {
1450 	.style = FIFO_RXTX, .maxpacket = 64,
1451 };
1452 
ep_config_from_table(struct musb * musb)1453 static int ep_config_from_table(struct musb *musb)
1454 {
1455 	const struct musb_fifo_cfg	*cfg;
1456 	unsigned		i, n;
1457 	int			offset;
1458 	struct musb_hw_ep	*hw_ep = musb->endpoints;
1459 
1460 	if (musb->config->fifo_cfg) {
1461 		cfg = musb->config->fifo_cfg;
1462 		n = musb->config->fifo_cfg_size;
1463 		goto done;
1464 	}
1465 
1466 	switch (fifo_mode) {
1467 	default:
1468 		fifo_mode = 0;
1469 		fallthrough;
1470 	case 0:
1471 		cfg = mode_0_cfg;
1472 		n = ARRAY_SIZE(mode_0_cfg);
1473 		break;
1474 	case 1:
1475 		cfg = mode_1_cfg;
1476 		n = ARRAY_SIZE(mode_1_cfg);
1477 		break;
1478 	case 2:
1479 		cfg = mode_2_cfg;
1480 		n = ARRAY_SIZE(mode_2_cfg);
1481 		break;
1482 	case 3:
1483 		cfg = mode_3_cfg;
1484 		n = ARRAY_SIZE(mode_3_cfg);
1485 		break;
1486 	case 4:
1487 		cfg = mode_4_cfg;
1488 		n = ARRAY_SIZE(mode_4_cfg);
1489 		break;
1490 	case 5:
1491 		cfg = mode_5_cfg;
1492 		n = ARRAY_SIZE(mode_5_cfg);
1493 		break;
1494 	}
1495 
1496 	pr_debug("%s: setup fifo_mode %d\n", musb_driver_name, fifo_mode);
1497 
1498 
1499 done:
1500 	offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0);
1501 	/* assert(offset > 0) */
1502 
1503 	/* NOTE:  for RTL versions >= 1.400 EPINFO and RAMINFO would
1504 	 * be better than static musb->config->num_eps and DYN_FIFO_SIZE...
1505 	 */
1506 
1507 	for (i = 0; i < n; i++) {
1508 		u8	epn = cfg->hw_ep_num;
1509 
1510 		if (epn >= musb->config->num_eps) {
1511 			pr_debug("%s: invalid ep %d\n",
1512 					musb_driver_name, epn);
1513 			return -EINVAL;
1514 		}
1515 		offset = fifo_setup(musb, hw_ep + epn, cfg++, offset);
1516 		if (offset < 0) {
1517 			pr_debug("%s: mem overrun, ep %d\n",
1518 					musb_driver_name, epn);
1519 			return offset;
1520 		}
1521 		epn++;
1522 		musb->nr_endpoints = max(epn, musb->nr_endpoints);
1523 	}
1524 
1525 	pr_debug("%s: %d/%d max ep, %d/%d memory\n",
1526 			musb_driver_name,
1527 			n + 1, musb->config->num_eps * 2 - 1,
1528 			offset, (1 << (musb->config->ram_bits + 2)));
1529 
1530 	if (!musb->bulk_ep) {
1531 		pr_debug("%s: missing bulk\n", musb_driver_name);
1532 		return -EINVAL;
1533 	}
1534 
1535 	return 0;
1536 }
1537 
1538 
1539 /*
1540  * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false
1541  * @param musb the controller
1542  */
ep_config_from_hw(struct musb * musb)1543 static int ep_config_from_hw(struct musb *musb)
1544 {
1545 	u8 epnum = 0;
1546 	struct musb_hw_ep *hw_ep;
1547 	void __iomem *mbase = musb->mregs;
1548 	int ret = 0;
1549 
1550 	musb_dbg(musb, "<== static silicon ep config");
1551 
1552 	/* FIXME pick up ep0 maxpacket size */
1553 
1554 	for (epnum = 1; epnum < musb->config->num_eps; epnum++) {
1555 		musb_ep_select(mbase, epnum);
1556 		hw_ep = musb->endpoints + epnum;
1557 
1558 		ret = musb_read_fifosize(musb, hw_ep, epnum);
1559 		if (ret < 0)
1560 			break;
1561 
1562 		/* FIXME set up hw_ep->{rx,tx}_double_buffered */
1563 
1564 		/* pick an RX/TX endpoint for bulk */
1565 		if (hw_ep->max_packet_sz_tx < 512
1566 				|| hw_ep->max_packet_sz_rx < 512)
1567 			continue;
1568 
1569 		/* REVISIT:  this algorithm is lazy, we should at least
1570 		 * try to pick a double buffered endpoint.
1571 		 */
1572 		if (musb->bulk_ep)
1573 			continue;
1574 		musb->bulk_ep = hw_ep;
1575 	}
1576 
1577 	if (!musb->bulk_ep) {
1578 		pr_debug("%s: missing bulk\n", musb_driver_name);
1579 		return -EINVAL;
1580 	}
1581 
1582 	return 0;
1583 }
1584 
1585 enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, };
1586 
1587 /* Initialize MUSB (M)HDRC part of the USB hardware subsystem;
1588  * configure endpoints, or take their config from silicon
1589  */
musb_core_init(u16 musb_type,struct musb * musb)1590 static int musb_core_init(u16 musb_type, struct musb *musb)
1591 {
1592 	u8 reg;
1593 	char *type;
1594 	char aInfo[90];
1595 	void __iomem	*mbase = musb->mregs;
1596 	int		status = 0;
1597 	int		i;
1598 
1599 	/* log core options (read using indexed model) */
1600 	reg = musb_read_configdata(mbase);
1601 
1602 	strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8");
1603 	if (reg & MUSB_CONFIGDATA_DYNFIFO) {
1604 		strcat(aInfo, ", dyn FIFOs");
1605 		musb->dyn_fifo = true;
1606 	}
1607 	if (reg & MUSB_CONFIGDATA_MPRXE) {
1608 		strcat(aInfo, ", bulk combine");
1609 		musb->bulk_combine = true;
1610 	}
1611 	if (reg & MUSB_CONFIGDATA_MPTXE) {
1612 		strcat(aInfo, ", bulk split");
1613 		musb->bulk_split = true;
1614 	}
1615 	if (reg & MUSB_CONFIGDATA_HBRXE) {
1616 		strcat(aInfo, ", HB-ISO Rx");
1617 		musb->hb_iso_rx = true;
1618 	}
1619 	if (reg & MUSB_CONFIGDATA_HBTXE) {
1620 		strcat(aInfo, ", HB-ISO Tx");
1621 		musb->hb_iso_tx = true;
1622 	}
1623 	if (reg & MUSB_CONFIGDATA_SOFTCONE)
1624 		strcat(aInfo, ", SoftConn");
1625 
1626 	pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo);
1627 
1628 	if (MUSB_CONTROLLER_MHDRC == musb_type) {
1629 		musb->is_multipoint = 1;
1630 		type = "M";
1631 	} else {
1632 		musb->is_multipoint = 0;
1633 		type = "";
1634 		if (IS_ENABLED(CONFIG_USB) &&
1635 		    !IS_ENABLED(CONFIG_USB_OTG_DISABLE_EXTERNAL_HUB)) {
1636 			pr_err("%s: kernel must disable external hubs, please fix the configuration\n",
1637 			       musb_driver_name);
1638 		}
1639 	}
1640 
1641 	/* log release info */
1642 	musb->hwvers = musb_readw(mbase, MUSB_HWVERS);
1643 	pr_debug("%s: %sHDRC RTL version %d.%d%s\n",
1644 		 musb_driver_name, type, MUSB_HWVERS_MAJOR(musb->hwvers),
1645 		 MUSB_HWVERS_MINOR(musb->hwvers),
1646 		 (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
1647 
1648 	/* configure ep0 */
1649 	musb_configure_ep0(musb);
1650 
1651 	/* discover endpoint configuration */
1652 	musb->nr_endpoints = 1;
1653 	musb->epmask = 1;
1654 
1655 	if (musb->dyn_fifo)
1656 		status = ep_config_from_table(musb);
1657 	else
1658 		status = ep_config_from_hw(musb);
1659 
1660 	if (status < 0)
1661 		return status;
1662 
1663 	/* finish init, and print endpoint config */
1664 	for (i = 0; i < musb->nr_endpoints; i++) {
1665 		struct musb_hw_ep	*hw_ep = musb->endpoints + i;
1666 
1667 		hw_ep->fifo = musb->io.fifo_offset(i) + mbase;
1668 #if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
1669 		if (musb->ops->quirks & MUSB_IN_TUSB) {
1670 			hw_ep->fifo_async = musb->async + 0x400 +
1671 				musb->io.fifo_offset(i);
1672 			hw_ep->fifo_sync = musb->sync + 0x400 +
1673 				musb->io.fifo_offset(i);
1674 			hw_ep->fifo_sync_va =
1675 				musb->sync_va + 0x400 + musb->io.fifo_offset(i);
1676 
1677 			if (i == 0)
1678 				hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF;
1679 			else
1680 				hw_ep->conf = mbase + 0x400 +
1681 					(((i - 1) & 0xf) << 2);
1682 		}
1683 #endif
1684 
1685 		hw_ep->regs = musb->io.ep_offset(i, 0) + mbase;
1686 		hw_ep->rx_reinit = 1;
1687 		hw_ep->tx_reinit = 1;
1688 
1689 		if (hw_ep->max_packet_sz_tx) {
1690 			musb_dbg(musb, "%s: hw_ep %d%s, %smax %d",
1691 				musb_driver_name, i,
1692 				hw_ep->is_shared_fifo ? "shared" : "tx",
1693 				hw_ep->tx_double_buffered
1694 					? "doublebuffer, " : "",
1695 				hw_ep->max_packet_sz_tx);
1696 		}
1697 		if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) {
1698 			musb_dbg(musb, "%s: hw_ep %d%s, %smax %d",
1699 				musb_driver_name, i,
1700 				"rx",
1701 				hw_ep->rx_double_buffered
1702 					? "doublebuffer, " : "",
1703 				hw_ep->max_packet_sz_rx);
1704 		}
1705 		if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx))
1706 			musb_dbg(musb, "hw_ep %d not configured", i);
1707 	}
1708 
1709 	return 0;
1710 }
1711 
1712 /*-------------------------------------------------------------------------*/
1713 
1714 /*
1715  * handle all the irqs defined by the HDRC core. for now we expect:  other
1716  * irq sources (phy, dma, etc) will be handled first, musb->int_* values
1717  * will be assigned, and the irq will already have been acked.
1718  *
1719  * called in irq context with spinlock held, irqs blocked
1720  */
musb_interrupt(struct musb * musb)1721 irqreturn_t musb_interrupt(struct musb *musb)
1722 {
1723 	irqreturn_t	retval = IRQ_NONE;
1724 	unsigned long	status;
1725 	unsigned long	epnum;
1726 	u8		devctl;
1727 
1728 	if (!musb->int_usb && !musb->int_tx && !musb->int_rx)
1729 		return IRQ_NONE;
1730 
1731 	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1732 
1733 	trace_musb_isr(musb);
1734 
1735 	/**
1736 	 * According to Mentor Graphics' documentation, flowchart on page 98,
1737 	 * IRQ should be handled as follows:
1738 	 *
1739 	 * . Resume IRQ
1740 	 * . Session Request IRQ
1741 	 * . VBUS Error IRQ
1742 	 * . Suspend IRQ
1743 	 * . Connect IRQ
1744 	 * . Disconnect IRQ
1745 	 * . Reset/Babble IRQ
1746 	 * . SOF IRQ (we're not using this one)
1747 	 * . Endpoint 0 IRQ
1748 	 * . TX Endpoints
1749 	 * . RX Endpoints
1750 	 *
1751 	 * We will be following that flowchart in order to avoid any problems
1752 	 * that might arise with internal Finite State Machine.
1753 	 */
1754 
1755 	if (musb->int_usb)
1756 		retval |= musb_stage0_irq(musb, musb->int_usb, devctl);
1757 
1758 	if (musb->int_tx & 1) {
1759 		if (is_host_active(musb))
1760 			retval |= musb_h_ep0_irq(musb);
1761 		else
1762 			retval |= musb_g_ep0_irq(musb);
1763 
1764 		/* we have just handled endpoint 0 IRQ, clear it */
1765 		musb->int_tx &= ~BIT(0);
1766 	}
1767 
1768 	status = musb->int_tx;
1769 
1770 	for_each_set_bit(epnum, &status, 16) {
1771 		retval = IRQ_HANDLED;
1772 		if (is_host_active(musb))
1773 			musb_host_tx(musb, epnum);
1774 		else
1775 			musb_g_tx(musb, epnum);
1776 	}
1777 
1778 	status = musb->int_rx;
1779 
1780 	for_each_set_bit(epnum, &status, 16) {
1781 		retval = IRQ_HANDLED;
1782 		if (is_host_active(musb))
1783 			musb_host_rx(musb, epnum);
1784 		else
1785 			musb_g_rx(musb, epnum);
1786 	}
1787 
1788 	return retval;
1789 }
1790 EXPORT_SYMBOL_GPL(musb_interrupt);
1791 
1792 #ifndef CONFIG_MUSB_PIO_ONLY
1793 static bool use_dma = true;
1794 
1795 /* "modprobe ... use_dma=0" etc */
1796 module_param(use_dma, bool, 0644);
1797 MODULE_PARM_DESC(use_dma, "enable/disable use of DMA");
1798 
musb_dma_completion(struct musb * musb,u8 epnum,u8 transmit)1799 void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit)
1800 {
1801 	/* called with controller lock already held */
1802 
1803 	if (!epnum) {
1804 		if (!is_cppi_enabled(musb)) {
1805 			/* endpoint 0 */
1806 			if (is_host_active(musb))
1807 				musb_h_ep0_irq(musb);
1808 			else
1809 				musb_g_ep0_irq(musb);
1810 		}
1811 	} else {
1812 		/* endpoints 1..15 */
1813 		if (transmit) {
1814 			if (is_host_active(musb))
1815 				musb_host_tx(musb, epnum);
1816 			else
1817 				musb_g_tx(musb, epnum);
1818 		} else {
1819 			/* receive */
1820 			if (is_host_active(musb))
1821 				musb_host_rx(musb, epnum);
1822 			else
1823 				musb_g_rx(musb, epnum);
1824 		}
1825 	}
1826 }
1827 EXPORT_SYMBOL_GPL(musb_dma_completion);
1828 
1829 #else
1830 #define use_dma			0
1831 #endif
1832 
1833 static int (*musb_phy_callback)(enum musb_vbus_id_status status);
1834 
1835 /*
1836  * musb_mailbox - optional phy notifier function
1837  * @status phy state change
1838  *
1839  * Optionally gets called from the USB PHY. Note that the USB PHY must be
1840  * disabled at the point the phy_callback is registered or unregistered.
1841  */
musb_mailbox(enum musb_vbus_id_status status)1842 int musb_mailbox(enum musb_vbus_id_status status)
1843 {
1844 	if (musb_phy_callback)
1845 		return musb_phy_callback(status);
1846 
1847 	return -ENODEV;
1848 };
1849 EXPORT_SYMBOL_GPL(musb_mailbox);
1850 
1851 /*-------------------------------------------------------------------------*/
1852 
1853 static ssize_t
mode_show(struct device * dev,struct device_attribute * attr,char * buf)1854 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
1855 {
1856 	struct musb *musb = dev_to_musb(dev);
1857 	unsigned long flags;
1858 	int ret;
1859 
1860 	spin_lock_irqsave(&musb->lock, flags);
1861 	ret = sprintf(buf, "%s\n", musb_otg_state_string(musb));
1862 	spin_unlock_irqrestore(&musb->lock, flags);
1863 
1864 	return ret;
1865 }
1866 
1867 static ssize_t
mode_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t n)1868 mode_store(struct device *dev, struct device_attribute *attr,
1869 		const char *buf, size_t n)
1870 {
1871 	struct musb	*musb = dev_to_musb(dev);
1872 	unsigned long	flags;
1873 	int		status;
1874 
1875 	spin_lock_irqsave(&musb->lock, flags);
1876 	if (sysfs_streq(buf, "host"))
1877 		status = musb_platform_set_mode(musb, MUSB_HOST);
1878 	else if (sysfs_streq(buf, "peripheral"))
1879 		status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
1880 	else if (sysfs_streq(buf, "otg"))
1881 		status = musb_platform_set_mode(musb, MUSB_OTG);
1882 	else
1883 		status = -EINVAL;
1884 	spin_unlock_irqrestore(&musb->lock, flags);
1885 
1886 	return (status == 0) ? n : status;
1887 }
1888 static DEVICE_ATTR_RW(mode);
1889 
1890 static ssize_t
vbus_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t n)1891 vbus_store(struct device *dev, struct device_attribute *attr,
1892 		const char *buf, size_t n)
1893 {
1894 	struct musb	*musb = dev_to_musb(dev);
1895 	unsigned long	flags;
1896 	unsigned long	val;
1897 
1898 	if (sscanf(buf, "%lu", &val) < 1) {
1899 		dev_err(dev, "Invalid VBUS timeout ms value\n");
1900 		return -EINVAL;
1901 	}
1902 
1903 	spin_lock_irqsave(&musb->lock, flags);
1904 	/* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
1905 	musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
1906 	if (musb_get_state(musb) == OTG_STATE_A_WAIT_BCON)
1907 		musb->is_active = 0;
1908 	musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
1909 	spin_unlock_irqrestore(&musb->lock, flags);
1910 
1911 	return n;
1912 }
1913 
1914 static ssize_t
vbus_show(struct device * dev,struct device_attribute * attr,char * buf)1915 vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
1916 {
1917 	struct musb	*musb = dev_to_musb(dev);
1918 	unsigned long	flags;
1919 	unsigned long	val;
1920 	int		vbus;
1921 	u8		devctl;
1922 
1923 	pm_runtime_get_sync(dev);
1924 	spin_lock_irqsave(&musb->lock, flags);
1925 	val = musb->a_wait_bcon;
1926 	vbus = musb_platform_get_vbus_status(musb);
1927 	if (vbus < 0) {
1928 		/* Use default MUSB method by means of DEVCTL register */
1929 		devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1930 		if ((devctl & MUSB_DEVCTL_VBUS)
1931 				== (3 << MUSB_DEVCTL_VBUS_SHIFT))
1932 			vbus = 1;
1933 		else
1934 			vbus = 0;
1935 	}
1936 	spin_unlock_irqrestore(&musb->lock, flags);
1937 	pm_runtime_put_sync(dev);
1938 
1939 	return sprintf(buf, "Vbus %s, timeout %lu msec\n",
1940 			vbus ? "on" : "off", val);
1941 }
1942 static DEVICE_ATTR_RW(vbus);
1943 
1944 /* Gadget drivers can't know that a host is connected so they might want
1945  * to start SRP, but users can.  This allows userspace to trigger SRP.
1946  */
srp_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t n)1947 static ssize_t srp_store(struct device *dev, struct device_attribute *attr,
1948 		const char *buf, size_t n)
1949 {
1950 	struct musb	*musb = dev_to_musb(dev);
1951 	unsigned short	srp;
1952 
1953 	if (sscanf(buf, "%hu", &srp) != 1
1954 			|| (srp != 1)) {
1955 		dev_err(dev, "SRP: Value must be 1\n");
1956 		return -EINVAL;
1957 	}
1958 
1959 	if (srp == 1)
1960 		musb_g_wakeup(musb);
1961 
1962 	return n;
1963 }
1964 static DEVICE_ATTR_WO(srp);
1965 
1966 static struct attribute *musb_attrs[] = {
1967 	&dev_attr_mode.attr,
1968 	&dev_attr_vbus.attr,
1969 	&dev_attr_srp.attr,
1970 	NULL
1971 };
1972 ATTRIBUTE_GROUPS(musb);
1973 
1974 #define MUSB_QUIRK_B_INVALID_VBUS_91	(MUSB_DEVCTL_BDEVICE | \
1975 					 (2 << MUSB_DEVCTL_VBUS_SHIFT) | \
1976 					 MUSB_DEVCTL_SESSION)
1977 #define MUSB_QUIRK_B_DISCONNECT_99	(MUSB_DEVCTL_BDEVICE | \
1978 					 (3 << MUSB_DEVCTL_VBUS_SHIFT) | \
1979 					 MUSB_DEVCTL_SESSION)
1980 #define MUSB_QUIRK_A_DISCONNECT_19	((3 << MUSB_DEVCTL_VBUS_SHIFT) | \
1981 					 MUSB_DEVCTL_SESSION)
1982 
musb_state_needs_recheck(struct musb * musb,u8 devctl,const char * desc)1983 static bool musb_state_needs_recheck(struct musb *musb, u8 devctl,
1984 				     const char *desc)
1985 {
1986 	if (musb->quirk_retries && !musb->flush_irq_work) {
1987 		trace_musb_state(musb, devctl, desc);
1988 		schedule_delayed_work(&musb->irq_work,
1989 				      msecs_to_jiffies(1000));
1990 		musb->quirk_retries--;
1991 
1992 		return true;
1993 	}
1994 
1995 	return false;
1996 }
1997 
1998 /*
1999  * Check the musb devctl session bit to determine if we want to
2000  * allow PM runtime for the device. In general, we want to keep things
2001  * active when the session bit is set except after host disconnect.
2002  *
2003  * Only called from musb_irq_work. If this ever needs to get called
2004  * elsewhere, proper locking must be implemented for musb->session.
2005  */
musb_pm_runtime_check_session(struct musb * musb)2006 static void musb_pm_runtime_check_session(struct musb *musb)
2007 {
2008 	u8 devctl, s;
2009 	int error;
2010 
2011 	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2012 
2013 	/* Handle session status quirks first */
2014 	s = MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV |
2015 		MUSB_DEVCTL_HR;
2016 	switch (devctl & ~s) {
2017 	case MUSB_QUIRK_B_DISCONNECT_99:
2018 		musb_state_needs_recheck(musb, devctl,
2019 			"Poll devctl in case of suspend after disconnect");
2020 		break;
2021 	case MUSB_QUIRK_B_INVALID_VBUS_91:
2022 		if (musb_state_needs_recheck(musb, devctl,
2023 				"Poll devctl on invalid vbus, assume no session"))
2024 			return;
2025 		fallthrough;
2026 	case MUSB_QUIRK_A_DISCONNECT_19:
2027 		if (musb_state_needs_recheck(musb, devctl,
2028 				"Poll devctl on possible host mode disconnect"))
2029 			return;
2030 		if (!musb->session)
2031 			break;
2032 		trace_musb_state(musb, devctl, "Allow PM on possible host mode disconnect");
2033 		pm_runtime_mark_last_busy(musb->controller);
2034 		pm_runtime_put_autosuspend(musb->controller);
2035 		musb->session = false;
2036 		return;
2037 	default:
2038 		break;
2039 	}
2040 
2041 	/* No need to do anything if session has not changed */
2042 	s = devctl & MUSB_DEVCTL_SESSION;
2043 	if (s == musb->session)
2044 		return;
2045 
2046 	/* Block PM or allow PM? */
2047 	if (s) {
2048 		trace_musb_state(musb, devctl, "Block PM on active session");
2049 		error = pm_runtime_get_sync(musb->controller);
2050 		if (error < 0)
2051 			dev_err(musb->controller, "Could not enable: %i\n",
2052 				error);
2053 		musb->quirk_retries = 3;
2054 
2055 		/*
2056 		 * We can get a spurious MUSB_INTR_SESSREQ interrupt on start-up
2057 		 * in B-peripheral mode with nothing connected and the session
2058 		 * bit clears silently. Check status again in 3 seconds.
2059 		 */
2060 		if (devctl & MUSB_DEVCTL_BDEVICE)
2061 			schedule_delayed_work(&musb->irq_work,
2062 					      msecs_to_jiffies(3000));
2063 	} else {
2064 		trace_musb_state(musb, devctl, "Allow PM with no session");
2065 		pm_runtime_mark_last_busy(musb->controller);
2066 		pm_runtime_put_autosuspend(musb->controller);
2067 	}
2068 
2069 	musb->session = s;
2070 }
2071 
2072 /* Only used to provide driver mode change events */
musb_irq_work(struct work_struct * data)2073 static void musb_irq_work(struct work_struct *data)
2074 {
2075 	struct musb *musb = container_of(data, struct musb, irq_work.work);
2076 	int error;
2077 
2078 	error = pm_runtime_resume_and_get(musb->controller);
2079 	if (error < 0) {
2080 		dev_err(musb->controller, "Could not enable: %i\n", error);
2081 
2082 		return;
2083 	}
2084 
2085 	musb_pm_runtime_check_session(musb);
2086 
2087 	if (musb_get_state(musb) != musb->xceiv_old_state) {
2088 		musb->xceiv_old_state = musb_get_state(musb);
2089 		sysfs_notify(&musb->controller->kobj, NULL, "mode");
2090 	}
2091 
2092 	pm_runtime_mark_last_busy(musb->controller);
2093 	pm_runtime_put_autosuspend(musb->controller);
2094 }
2095 
musb_recover_from_babble(struct musb * musb)2096 static void musb_recover_from_babble(struct musb *musb)
2097 {
2098 	int ret;
2099 	u8 devctl;
2100 
2101 	musb_disable_interrupts(musb);
2102 
2103 	/*
2104 	 * wait at least 320 cycles of 60MHz clock. That's 5.3us, we will give
2105 	 * it some slack and wait for 10us.
2106 	 */
2107 	udelay(10);
2108 
2109 	ret  = musb_platform_recover(musb);
2110 	if (ret) {
2111 		musb_enable_interrupts(musb);
2112 		return;
2113 	}
2114 
2115 	/* drop session bit */
2116 	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2117 	devctl &= ~MUSB_DEVCTL_SESSION;
2118 	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
2119 
2120 	/* tell usbcore about it */
2121 	musb_root_disconnect(musb);
2122 
2123 	/*
2124 	 * When a babble condition occurs, the musb controller
2125 	 * removes the session bit and the endpoint config is lost.
2126 	 */
2127 	if (musb->dyn_fifo)
2128 		ret = ep_config_from_table(musb);
2129 	else
2130 		ret = ep_config_from_hw(musb);
2131 
2132 	/* restart session */
2133 	if (ret == 0)
2134 		musb_start(musb);
2135 }
2136 
2137 /* --------------------------------------------------------------------------
2138  * Init support
2139  */
2140 
allocate_instance(struct device * dev,const struct musb_hdrc_config * config,void __iomem * mbase)2141 static struct musb *allocate_instance(struct device *dev,
2142 		const struct musb_hdrc_config *config, void __iomem *mbase)
2143 {
2144 	struct musb		*musb;
2145 	struct musb_hw_ep	*ep;
2146 	int			epnum;
2147 	int			ret;
2148 
2149 	musb = devm_kzalloc(dev, sizeof(*musb), GFP_KERNEL);
2150 	if (!musb)
2151 		return NULL;
2152 
2153 	INIT_LIST_HEAD(&musb->control);
2154 	INIT_LIST_HEAD(&musb->in_bulk);
2155 	INIT_LIST_HEAD(&musb->out_bulk);
2156 	INIT_LIST_HEAD(&musb->pending_list);
2157 
2158 	musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
2159 	musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON;
2160 	musb->mregs = mbase;
2161 	musb->ctrl_base = mbase;
2162 	musb->nIrq = -ENODEV;
2163 	musb->config = config;
2164 	BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS);
2165 	for (epnum = 0, ep = musb->endpoints;
2166 			epnum < musb->config->num_eps;
2167 			epnum++, ep++) {
2168 		ep->musb = musb;
2169 		ep->epnum = epnum;
2170 	}
2171 
2172 	musb->controller = dev;
2173 
2174 	ret = musb_host_alloc(musb);
2175 	if (ret < 0)
2176 		goto err_free;
2177 
2178 	dev_set_drvdata(dev, musb);
2179 
2180 	return musb;
2181 
2182 err_free:
2183 	return NULL;
2184 }
2185 
musb_free(struct musb * musb)2186 static void musb_free(struct musb *musb)
2187 {
2188 	/* this has multiple entry modes. it handles fault cleanup after
2189 	 * probe(), where things may be partially set up, as well as rmmod
2190 	 * cleanup after everything's been de-activated.
2191 	 */
2192 
2193 	if (musb->nIrq >= 0) {
2194 		if (musb->irq_wake)
2195 			disable_irq_wake(musb->nIrq);
2196 		free_irq(musb->nIrq, musb);
2197 	}
2198 
2199 	musb_host_free(musb);
2200 }
2201 
2202 struct musb_pending_work {
2203 	int (*callback)(struct musb *musb, void *data);
2204 	void *data;
2205 	struct list_head node;
2206 };
2207 
2208 #ifdef CONFIG_PM
2209 /*
2210  * Called from musb_runtime_resume(), musb_resume(), and
2211  * musb_queue_resume_work(). Callers must take musb->lock.
2212  */
musb_run_resume_work(struct musb * musb)2213 static int musb_run_resume_work(struct musb *musb)
2214 {
2215 	struct musb_pending_work *w, *_w;
2216 	unsigned long flags;
2217 	int error = 0;
2218 
2219 	spin_lock_irqsave(&musb->list_lock, flags);
2220 	list_for_each_entry_safe(w, _w, &musb->pending_list, node) {
2221 		if (w->callback) {
2222 			error = w->callback(musb, w->data);
2223 			if (error < 0) {
2224 				dev_err(musb->controller,
2225 					"resume callback %p failed: %i\n",
2226 					w->callback, error);
2227 			}
2228 		}
2229 		list_del(&w->node);
2230 		devm_kfree(musb->controller, w);
2231 	}
2232 	spin_unlock_irqrestore(&musb->list_lock, flags);
2233 
2234 	return error;
2235 }
2236 #endif
2237 
2238 /*
2239  * Called to run work if device is active or else queue the work to happen
2240  * on resume. Caller must take musb->lock and must hold an RPM reference.
2241  *
2242  * Note that we cowardly refuse queuing work after musb PM runtime
2243  * resume is done calling musb_run_resume_work() and return -EINPROGRESS
2244  * instead.
2245  */
musb_queue_resume_work(struct musb * musb,int (* callback)(struct musb * musb,void * data),void * data)2246 int musb_queue_resume_work(struct musb *musb,
2247 			   int (*callback)(struct musb *musb, void *data),
2248 			   void *data)
2249 {
2250 	struct musb_pending_work *w;
2251 	unsigned long flags;
2252 	bool is_suspended;
2253 	int error;
2254 
2255 	if (WARN_ON(!callback))
2256 		return -EINVAL;
2257 
2258 	spin_lock_irqsave(&musb->list_lock, flags);
2259 	is_suspended = musb->is_runtime_suspended;
2260 
2261 	if (is_suspended) {
2262 		w = devm_kzalloc(musb->controller, sizeof(*w), GFP_ATOMIC);
2263 		if (!w) {
2264 			error = -ENOMEM;
2265 			goto out_unlock;
2266 		}
2267 
2268 		w->callback = callback;
2269 		w->data = data;
2270 
2271 		list_add_tail(&w->node, &musb->pending_list);
2272 		error = 0;
2273 	}
2274 
2275 out_unlock:
2276 	spin_unlock_irqrestore(&musb->list_lock, flags);
2277 
2278 	if (!is_suspended)
2279 		error = callback(musb, data);
2280 
2281 	return error;
2282 }
2283 EXPORT_SYMBOL_GPL(musb_queue_resume_work);
2284 
musb_deassert_reset(struct work_struct * work)2285 static void musb_deassert_reset(struct work_struct *work)
2286 {
2287 	struct musb *musb;
2288 	unsigned long flags;
2289 
2290 	musb = container_of(work, struct musb, deassert_reset_work.work);
2291 
2292 	spin_lock_irqsave(&musb->lock, flags);
2293 
2294 	if (musb->port1_status & USB_PORT_STAT_RESET)
2295 		musb_port_reset(musb, false);
2296 
2297 	spin_unlock_irqrestore(&musb->lock, flags);
2298 }
2299 
2300 /*
2301  * Perform generic per-controller initialization.
2302  *
2303  * @dev: the controller (already clocked, etc)
2304  * @nIrq: IRQ number
2305  * @ctrl: virtual address of controller registers,
2306  *	not yet corrected for platform-specific offsets
2307  */
2308 static int
musb_init_controller(struct device * dev,int nIrq,void __iomem * ctrl)2309 musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
2310 {
2311 	int			status;
2312 	struct musb		*musb;
2313 	struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
2314 
2315 	/* The driver might handle more features than the board; OK.
2316 	 * Fail when the board needs a feature that's not enabled.
2317 	 */
2318 	if (!plat) {
2319 		dev_err(dev, "no platform_data?\n");
2320 		status = -ENODEV;
2321 		goto fail0;
2322 	}
2323 
2324 	/* allocate */
2325 	musb = allocate_instance(dev, plat->config, ctrl);
2326 	if (!musb) {
2327 		status = -ENOMEM;
2328 		goto fail0;
2329 	}
2330 
2331 	spin_lock_init(&musb->lock);
2332 	spin_lock_init(&musb->list_lock);
2333 	musb->min_power = plat->min_power;
2334 	musb->ops = plat->platform_ops;
2335 	musb->port_mode = plat->mode;
2336 
2337 	/*
2338 	 * Initialize the default IO functions. At least omap2430 needs
2339 	 * these early. We initialize the platform specific IO functions
2340 	 * later on.
2341 	 */
2342 	musb_readb = musb_default_readb;
2343 	musb_writeb = musb_default_writeb;
2344 	musb_readw = musb_default_readw;
2345 	musb_writew = musb_default_writew;
2346 
2347 	/* The musb_platform_init() call:
2348 	 *   - adjusts musb->mregs
2349 	 *   - sets the musb->isr
2350 	 *   - may initialize an integrated transceiver
2351 	 *   - initializes musb->xceiv, usually by otg_get_phy()
2352 	 *   - stops powering VBUS
2353 	 *
2354 	 * There are various transceiver configurations.
2355 	 * DaVinci, TUSB60x0, and others integrate them.  OMAP3 uses
2356 	 * external/discrete ones in various flavors (twl4030 family,
2357 	 * isp1504, non-OTG, etc) mostly hooking up through ULPI.
2358 	 */
2359 	status = musb_platform_init(musb);
2360 	if (status < 0)
2361 		goto fail1;
2362 
2363 	if (!musb->isr) {
2364 		status = -ENODEV;
2365 		goto fail2;
2366 	}
2367 
2368 
2369 	/* Most devices use indexed offset or flat offset */
2370 	if (musb->ops->quirks & MUSB_INDEXED_EP) {
2371 		musb->io.ep_offset = musb_indexed_ep_offset;
2372 		musb->io.ep_select = musb_indexed_ep_select;
2373 	} else {
2374 		musb->io.ep_offset = musb_flat_ep_offset;
2375 		musb->io.ep_select = musb_flat_ep_select;
2376 	}
2377 
2378 	if (musb->ops->quirks & MUSB_G_NO_SKB_RESERVE)
2379 		musb->g.quirk_avoids_skb_reserve = 1;
2380 
2381 	/* At least tusb6010 has its own offsets */
2382 	if (musb->ops->ep_offset)
2383 		musb->io.ep_offset = musb->ops->ep_offset;
2384 	if (musb->ops->ep_select)
2385 		musb->io.ep_select = musb->ops->ep_select;
2386 
2387 	if (musb->ops->fifo_mode)
2388 		fifo_mode = musb->ops->fifo_mode;
2389 	else
2390 		fifo_mode = 4;
2391 
2392 	if (musb->ops->fifo_offset)
2393 		musb->io.fifo_offset = musb->ops->fifo_offset;
2394 	else
2395 		musb->io.fifo_offset = musb_default_fifo_offset;
2396 
2397 	if (musb->ops->busctl_offset)
2398 		musb->io.busctl_offset = musb->ops->busctl_offset;
2399 	else
2400 		musb->io.busctl_offset = musb_default_busctl_offset;
2401 
2402 	if (musb->ops->readb)
2403 		musb_readb = musb->ops->readb;
2404 	if (musb->ops->writeb)
2405 		musb_writeb = musb->ops->writeb;
2406 	if (musb->ops->clearb)
2407 		musb_clearb = musb->ops->clearb;
2408 	else
2409 		musb_clearb = musb_readb;
2410 
2411 	if (musb->ops->readw)
2412 		musb_readw = musb->ops->readw;
2413 	if (musb->ops->writew)
2414 		musb_writew = musb->ops->writew;
2415 	if (musb->ops->clearw)
2416 		musb_clearw = musb->ops->clearw;
2417 	else
2418 		musb_clearw = musb_readw;
2419 
2420 #ifndef CONFIG_MUSB_PIO_ONLY
2421 	if (!musb->ops->dma_init || !musb->ops->dma_exit) {
2422 		dev_err(dev, "DMA controller not set\n");
2423 		status = -ENODEV;
2424 		goto fail2;
2425 	}
2426 	musb_dma_controller_create = musb->ops->dma_init;
2427 	musb_dma_controller_destroy = musb->ops->dma_exit;
2428 #endif
2429 
2430 	if (musb->ops->read_fifo)
2431 		musb->io.read_fifo = musb->ops->read_fifo;
2432 	else
2433 		musb->io.read_fifo = musb_default_read_fifo;
2434 
2435 	if (musb->ops->write_fifo)
2436 		musb->io.write_fifo = musb->ops->write_fifo;
2437 	else
2438 		musb->io.write_fifo = musb_default_write_fifo;
2439 
2440 	if (musb->ops->get_toggle)
2441 		musb->io.get_toggle = musb->ops->get_toggle;
2442 	else
2443 		musb->io.get_toggle = musb_default_get_toggle;
2444 
2445 	if (musb->ops->set_toggle)
2446 		musb->io.set_toggle = musb->ops->set_toggle;
2447 	else
2448 		musb->io.set_toggle = musb_default_set_toggle;
2449 
2450 	if (IS_ENABLED(CONFIG_USB_PHY) && musb->xceiv && !musb->xceiv->io_ops) {
2451 		musb->xceiv->io_dev = musb->controller;
2452 		musb->xceiv->io_priv = musb->mregs;
2453 		musb->xceiv->io_ops = &musb_ulpi_access;
2454 	}
2455 
2456 	if (musb->ops->phy_callback)
2457 		musb_phy_callback = musb->ops->phy_callback;
2458 
2459 	/*
2460 	 * We need musb_read/write functions initialized for PM.
2461 	 * Note that at least 2430 glue needs autosuspend delay
2462 	 * somewhere above 300 ms for the hardware to idle properly
2463 	 * after disconnecting the cable in host mode. Let's use
2464 	 * 500 ms for some margin.
2465 	 */
2466 	pm_runtime_use_autosuspend(musb->controller);
2467 	pm_runtime_set_autosuspend_delay(musb->controller, 500);
2468 	pm_runtime_enable(musb->controller);
2469 	pm_runtime_get_sync(musb->controller);
2470 
2471 	status = usb_phy_init(musb->xceiv);
2472 	if (status < 0)
2473 		goto err_usb_phy_init;
2474 
2475 	if (use_dma && dev->dma_mask) {
2476 		musb->dma_controller =
2477 			musb_dma_controller_create(musb, musb->mregs);
2478 		if (IS_ERR(musb->dma_controller)) {
2479 			status = PTR_ERR(musb->dma_controller);
2480 			goto fail2_5;
2481 		}
2482 	}
2483 
2484 	/* be sure interrupts are disabled before connecting ISR */
2485 	musb_platform_disable(musb);
2486 	musb_disable_interrupts(musb);
2487 	musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
2488 
2489 	/* MUSB_POWER_SOFTCONN might be already set, JZ4740 does this. */
2490 	musb_writeb(musb->mregs, MUSB_POWER, 0);
2491 
2492 	/* Init IRQ workqueue before request_irq */
2493 	INIT_DELAYED_WORK(&musb->irq_work, musb_irq_work);
2494 	INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
2495 	INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume);
2496 
2497 	/* setup musb parts of the core (especially endpoints) */
2498 	status = musb_core_init(plat->config->multipoint
2499 			? MUSB_CONTROLLER_MHDRC
2500 			: MUSB_CONTROLLER_HDRC, musb);
2501 	if (status < 0)
2502 		goto fail3;
2503 
2504 	timer_setup(&musb->otg_timer, musb_otg_timer_func, 0);
2505 
2506 	/* attach to the IRQ */
2507 	if (request_irq(nIrq, musb->isr, IRQF_SHARED, dev_name(dev), musb)) {
2508 		dev_err(dev, "request_irq %d failed!\n", nIrq);
2509 		status = -ENODEV;
2510 		goto fail3;
2511 	}
2512 	musb->nIrq = nIrq;
2513 	/* FIXME this handles wakeup irqs wrong */
2514 	if (enable_irq_wake(nIrq) == 0) {
2515 		musb->irq_wake = 1;
2516 		device_init_wakeup(dev, 1);
2517 	} else {
2518 		musb->irq_wake = 0;
2519 	}
2520 
2521 	/* program PHY to use external vBus if required */
2522 	if (plat->extvbus) {
2523 		u8 busctl = musb_readb(musb->mregs, MUSB_ULPI_BUSCONTROL);
2524 		busctl |= MUSB_ULPI_USE_EXTVBUS;
2525 		musb_writeb(musb->mregs, MUSB_ULPI_BUSCONTROL, busctl);
2526 	}
2527 
2528 	MUSB_DEV_MODE(musb);
2529 	musb_set_state(musb, OTG_STATE_B_IDLE);
2530 
2531 	switch (musb->port_mode) {
2532 	case MUSB_HOST:
2533 		status = musb_host_setup(musb, plat->power);
2534 		if (status < 0)
2535 			goto fail3;
2536 		status = musb_platform_set_mode(musb, MUSB_HOST);
2537 		break;
2538 	case MUSB_PERIPHERAL:
2539 		status = musb_gadget_setup(musb);
2540 		if (status < 0)
2541 			goto fail3;
2542 		status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
2543 		break;
2544 	case MUSB_OTG:
2545 		status = musb_host_setup(musb, plat->power);
2546 		if (status < 0)
2547 			goto fail3;
2548 		status = musb_gadget_setup(musb);
2549 		if (status) {
2550 			musb_host_cleanup(musb);
2551 			goto fail3;
2552 		}
2553 		status = musb_platform_set_mode(musb, MUSB_OTG);
2554 		break;
2555 	default:
2556 		dev_err(dev, "unsupported port mode %d\n", musb->port_mode);
2557 		break;
2558 	}
2559 
2560 	if (status < 0)
2561 		goto fail3;
2562 
2563 	musb_init_debugfs(musb);
2564 
2565 	musb->is_initialized = 1;
2566 	pm_runtime_mark_last_busy(musb->controller);
2567 	pm_runtime_put_autosuspend(musb->controller);
2568 
2569 	return 0;
2570 
2571 fail3:
2572 	cancel_delayed_work_sync(&musb->irq_work);
2573 	cancel_delayed_work_sync(&musb->finish_resume_work);
2574 	cancel_delayed_work_sync(&musb->deassert_reset_work);
2575 	if (musb->dma_controller)
2576 		musb_dma_controller_destroy(musb->dma_controller);
2577 
2578 fail2_5:
2579 	usb_phy_shutdown(musb->xceiv);
2580 
2581 err_usb_phy_init:
2582 	pm_runtime_dont_use_autosuspend(musb->controller);
2583 	pm_runtime_put_sync(musb->controller);
2584 	pm_runtime_disable(musb->controller);
2585 
2586 fail2:
2587 	if (musb->irq_wake)
2588 		device_init_wakeup(dev, 0);
2589 	musb_platform_exit(musb);
2590 
2591 fail1:
2592 	dev_err_probe(musb->controller, status, "%s failed\n", __func__);
2593 
2594 	musb_free(musb);
2595 
2596 fail0:
2597 
2598 	return status;
2599 
2600 }
2601 
2602 /*-------------------------------------------------------------------------*/
2603 
2604 /* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just
2605  * bridge to a platform device; this driver then suffices.
2606  */
musb_probe(struct platform_device * pdev)2607 static int musb_probe(struct platform_device *pdev)
2608 {
2609 	struct device	*dev = &pdev->dev;
2610 	int		irq = platform_get_irq_byname(pdev, "mc");
2611 	void __iomem	*base;
2612 
2613 	if (irq < 0)
2614 		return irq;
2615 
2616 	base = devm_platform_ioremap_resource(pdev, 0);
2617 	if (IS_ERR(base))
2618 		return PTR_ERR(base);
2619 
2620 	return musb_init_controller(dev, irq, base);
2621 }
2622 
musb_remove(struct platform_device * pdev)2623 static void musb_remove(struct platform_device *pdev)
2624 {
2625 	struct device	*dev = &pdev->dev;
2626 	struct musb	*musb = dev_to_musb(dev);
2627 	unsigned long	flags;
2628 
2629 	/* this gets called on rmmod.
2630 	 *  - Host mode: host may still be active
2631 	 *  - Peripheral mode: peripheral is deactivated (or never-activated)
2632 	 *  - OTG mode: both roles are deactivated (or never-activated)
2633 	 */
2634 	musb_exit_debugfs(musb);
2635 
2636 	cancel_delayed_work_sync(&musb->irq_work);
2637 	cancel_delayed_work_sync(&musb->finish_resume_work);
2638 	cancel_delayed_work_sync(&musb->deassert_reset_work);
2639 	pm_runtime_get_sync(musb->controller);
2640 	musb_host_cleanup(musb);
2641 	musb_gadget_cleanup(musb);
2642 
2643 	musb_platform_disable(musb);
2644 	spin_lock_irqsave(&musb->lock, flags);
2645 	musb_disable_interrupts(musb);
2646 	musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
2647 	spin_unlock_irqrestore(&musb->lock, flags);
2648 	musb_platform_exit(musb);
2649 
2650 	pm_runtime_dont_use_autosuspend(musb->controller);
2651 	pm_runtime_put_sync(musb->controller);
2652 	pm_runtime_disable(musb->controller);
2653 	musb_phy_callback = NULL;
2654 	if (musb->dma_controller)
2655 		musb_dma_controller_destroy(musb->dma_controller);
2656 	usb_phy_shutdown(musb->xceiv);
2657 	musb_free(musb);
2658 	device_init_wakeup(dev, 0);
2659 }
2660 
2661 #ifdef	CONFIG_PM
2662 
musb_save_context(struct musb * musb)2663 static void musb_save_context(struct musb *musb)
2664 {
2665 	int i;
2666 	void __iomem *musb_base = musb->mregs;
2667 	void __iomem *epio;
2668 
2669 	musb->context.frame = musb_readw(musb_base, MUSB_FRAME);
2670 	musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE);
2671 	musb->context.busctl = musb_readb(musb_base, MUSB_ULPI_BUSCONTROL);
2672 	musb->context.power = musb_readb(musb_base, MUSB_POWER);
2673 	musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE);
2674 	musb->context.index = musb_readb(musb_base, MUSB_INDEX);
2675 	musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL);
2676 
2677 	for (i = 0; i < musb->config->num_eps; ++i) {
2678 		epio = musb->endpoints[i].regs;
2679 		if (!epio)
2680 			continue;
2681 
2682 		musb_writeb(musb_base, MUSB_INDEX, i);
2683 		musb->context.index_regs[i].txmaxp =
2684 			musb_readw(epio, MUSB_TXMAXP);
2685 		musb->context.index_regs[i].txcsr =
2686 			musb_readw(epio, MUSB_TXCSR);
2687 		musb->context.index_regs[i].rxmaxp =
2688 			musb_readw(epio, MUSB_RXMAXP);
2689 		musb->context.index_regs[i].rxcsr =
2690 			musb_readw(epio, MUSB_RXCSR);
2691 
2692 		if (musb->dyn_fifo) {
2693 			musb->context.index_regs[i].txfifoadd =
2694 					musb_readw(musb_base, MUSB_TXFIFOADD);
2695 			musb->context.index_regs[i].rxfifoadd =
2696 					musb_readw(musb_base, MUSB_RXFIFOADD);
2697 			musb->context.index_regs[i].txfifosz =
2698 					musb_readb(musb_base, MUSB_TXFIFOSZ);
2699 			musb->context.index_regs[i].rxfifosz =
2700 					musb_readb(musb_base, MUSB_RXFIFOSZ);
2701 		}
2702 
2703 		musb->context.index_regs[i].txtype =
2704 			musb_readb(epio, MUSB_TXTYPE);
2705 		musb->context.index_regs[i].txinterval =
2706 			musb_readb(epio, MUSB_TXINTERVAL);
2707 		musb->context.index_regs[i].rxtype =
2708 			musb_readb(epio, MUSB_RXTYPE);
2709 		musb->context.index_regs[i].rxinterval =
2710 			musb_readb(epio, MUSB_RXINTERVAL);
2711 
2712 		musb->context.index_regs[i].txfunaddr =
2713 			musb_read_txfunaddr(musb, i);
2714 		musb->context.index_regs[i].txhubaddr =
2715 			musb_read_txhubaddr(musb, i);
2716 		musb->context.index_regs[i].txhubport =
2717 			musb_read_txhubport(musb, i);
2718 
2719 		musb->context.index_regs[i].rxfunaddr =
2720 			musb_read_rxfunaddr(musb, i);
2721 		musb->context.index_regs[i].rxhubaddr =
2722 			musb_read_rxhubaddr(musb, i);
2723 		musb->context.index_regs[i].rxhubport =
2724 			musb_read_rxhubport(musb, i);
2725 	}
2726 }
2727 
musb_restore_context(struct musb * musb)2728 static void musb_restore_context(struct musb *musb)
2729 {
2730 	int i;
2731 	void __iomem *musb_base = musb->mregs;
2732 	void __iomem *epio;
2733 	u8 power;
2734 
2735 	musb_writew(musb_base, MUSB_FRAME, musb->context.frame);
2736 	musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode);
2737 	musb_writeb(musb_base, MUSB_ULPI_BUSCONTROL, musb->context.busctl);
2738 
2739 	/* Don't affect SUSPENDM/RESUME bits in POWER reg */
2740 	power = musb_readb(musb_base, MUSB_POWER);
2741 	power &= MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME;
2742 	musb->context.power &= ~(MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME);
2743 	power |= musb->context.power;
2744 	musb_writeb(musb_base, MUSB_POWER, power);
2745 
2746 	musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe);
2747 	musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe);
2748 	musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe);
2749 	if (musb->context.devctl & MUSB_DEVCTL_SESSION)
2750 		musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);
2751 
2752 	for (i = 0; i < musb->config->num_eps; ++i) {
2753 		epio = musb->endpoints[i].regs;
2754 		if (!epio)
2755 			continue;
2756 
2757 		musb_writeb(musb_base, MUSB_INDEX, i);
2758 		musb_writew(epio, MUSB_TXMAXP,
2759 			musb->context.index_regs[i].txmaxp);
2760 		musb_writew(epio, MUSB_TXCSR,
2761 			musb->context.index_regs[i].txcsr);
2762 		musb_writew(epio, MUSB_RXMAXP,
2763 			musb->context.index_regs[i].rxmaxp);
2764 		musb_writew(epio, MUSB_RXCSR,
2765 			musb->context.index_regs[i].rxcsr);
2766 
2767 		if (musb->dyn_fifo) {
2768 			musb_writeb(musb_base, MUSB_TXFIFOSZ,
2769 				musb->context.index_regs[i].txfifosz);
2770 			musb_writeb(musb_base, MUSB_RXFIFOSZ,
2771 				musb->context.index_regs[i].rxfifosz);
2772 			musb_writew(musb_base, MUSB_TXFIFOADD,
2773 				musb->context.index_regs[i].txfifoadd);
2774 			musb_writew(musb_base, MUSB_RXFIFOADD,
2775 				musb->context.index_regs[i].rxfifoadd);
2776 		}
2777 
2778 		musb_writeb(epio, MUSB_TXTYPE,
2779 				musb->context.index_regs[i].txtype);
2780 		musb_writeb(epio, MUSB_TXINTERVAL,
2781 				musb->context.index_regs[i].txinterval);
2782 		musb_writeb(epio, MUSB_RXTYPE,
2783 				musb->context.index_regs[i].rxtype);
2784 		musb_writeb(epio, MUSB_RXINTERVAL,
2785 
2786 				musb->context.index_regs[i].rxinterval);
2787 		musb_write_txfunaddr(musb, i,
2788 				musb->context.index_regs[i].txfunaddr);
2789 		musb_write_txhubaddr(musb, i,
2790 				musb->context.index_regs[i].txhubaddr);
2791 		musb_write_txhubport(musb, i,
2792 				musb->context.index_regs[i].txhubport);
2793 
2794 		musb_write_rxfunaddr(musb, i,
2795 				musb->context.index_regs[i].rxfunaddr);
2796 		musb_write_rxhubaddr(musb, i,
2797 				musb->context.index_regs[i].rxhubaddr);
2798 		musb_write_rxhubport(musb, i,
2799 				musb->context.index_regs[i].rxhubport);
2800 	}
2801 	musb_writeb(musb_base, MUSB_INDEX, musb->context.index);
2802 }
2803 
musb_suspend(struct device * dev)2804 static int musb_suspend(struct device *dev)
2805 {
2806 	struct musb	*musb = dev_to_musb(dev);
2807 	unsigned long	flags;
2808 	int ret;
2809 
2810 	ret = pm_runtime_get_sync(dev);
2811 	if (ret < 0) {
2812 		pm_runtime_put_noidle(dev);
2813 		return ret;
2814 	}
2815 
2816 	musb_platform_disable(musb);
2817 	musb_disable_interrupts(musb);
2818 
2819 	musb->flush_irq_work = true;
2820 	while (flush_delayed_work(&musb->irq_work))
2821 		;
2822 	musb->flush_irq_work = false;
2823 
2824 	if (!(musb->ops->quirks & MUSB_PRESERVE_SESSION))
2825 		musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
2826 
2827 	WARN_ON(!list_empty(&musb->pending_list));
2828 
2829 	spin_lock_irqsave(&musb->lock, flags);
2830 
2831 	if (is_peripheral_active(musb)) {
2832 		/* FIXME force disconnect unless we know USB will wake
2833 		 * the system up quickly enough to respond ...
2834 		 */
2835 	} else if (is_host_active(musb)) {
2836 		/* we know all the children are suspended; sometimes
2837 		 * they will even be wakeup-enabled.
2838 		 */
2839 	}
2840 
2841 	musb_save_context(musb);
2842 
2843 	spin_unlock_irqrestore(&musb->lock, flags);
2844 	return 0;
2845 }
2846 
musb_resume(struct device * dev)2847 static int musb_resume(struct device *dev)
2848 {
2849 	struct musb *musb = dev_to_musb(dev);
2850 	unsigned long flags;
2851 	int error;
2852 	u8 devctl;
2853 	u8 mask;
2854 
2855 	/*
2856 	 * For static cmos like DaVinci, register values were preserved
2857 	 * unless for some reason the whole soc powered down or the USB
2858 	 * module got reset through the PSC (vs just being disabled).
2859 	 *
2860 	 * For the DSPS glue layer though, a full register restore has to
2861 	 * be done. As it shouldn't harm other platforms, we do it
2862 	 * unconditionally.
2863 	 */
2864 
2865 	musb_restore_context(musb);
2866 
2867 	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2868 	mask = MUSB_DEVCTL_BDEVICE | MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV;
2869 	if ((devctl & mask) != (musb->context.devctl & mask))
2870 		musb->port1_status = 0;
2871 
2872 	musb_enable_interrupts(musb);
2873 	musb_platform_enable(musb);
2874 
2875 	/* session might be disabled in suspend */
2876 	if (musb->port_mode == MUSB_HOST &&
2877 	    !(musb->ops->quirks & MUSB_PRESERVE_SESSION)) {
2878 		devctl |= MUSB_DEVCTL_SESSION;
2879 		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
2880 	}
2881 
2882 	spin_lock_irqsave(&musb->lock, flags);
2883 	error = musb_run_resume_work(musb);
2884 	if (error)
2885 		dev_err(musb->controller, "resume work failed with %i\n",
2886 			error);
2887 	spin_unlock_irqrestore(&musb->lock, flags);
2888 
2889 	pm_runtime_mark_last_busy(dev);
2890 	pm_runtime_put_autosuspend(dev);
2891 
2892 	return 0;
2893 }
2894 
musb_runtime_suspend(struct device * dev)2895 static int musb_runtime_suspend(struct device *dev)
2896 {
2897 	struct musb	*musb = dev_to_musb(dev);
2898 
2899 	musb_save_context(musb);
2900 	musb->is_runtime_suspended = 1;
2901 
2902 	return 0;
2903 }
2904 
musb_runtime_resume(struct device * dev)2905 static int musb_runtime_resume(struct device *dev)
2906 {
2907 	struct musb *musb = dev_to_musb(dev);
2908 	unsigned long flags;
2909 	int error;
2910 
2911 	/*
2912 	 * When pm_runtime_get_sync called for the first time in driver
2913 	 * init,  some of the structure is still not initialized which is
2914 	 * used in restore function. But clock needs to be
2915 	 * enabled before any register access, so
2916 	 * pm_runtime_get_sync has to be called.
2917 	 * Also context restore without save does not make
2918 	 * any sense
2919 	 */
2920 	if (!musb->is_initialized)
2921 		return 0;
2922 
2923 	musb_restore_context(musb);
2924 
2925 	spin_lock_irqsave(&musb->lock, flags);
2926 	error = musb_run_resume_work(musb);
2927 	if (error)
2928 		dev_err(musb->controller, "resume work failed with %i\n",
2929 			error);
2930 	musb->is_runtime_suspended = 0;
2931 	spin_unlock_irqrestore(&musb->lock, flags);
2932 
2933 	return 0;
2934 }
2935 
2936 static const struct dev_pm_ops musb_dev_pm_ops = {
2937 	.suspend	= musb_suspend,
2938 	.resume		= musb_resume,
2939 	.runtime_suspend = musb_runtime_suspend,
2940 	.runtime_resume = musb_runtime_resume,
2941 };
2942 
2943 #define MUSB_DEV_PM_OPS (&musb_dev_pm_ops)
2944 #else
2945 #define	MUSB_DEV_PM_OPS	NULL
2946 #endif
2947 
2948 static struct platform_driver musb_driver = {
2949 	.driver = {
2950 		.name		= musb_driver_name,
2951 		.bus		= &platform_bus_type,
2952 		.pm		= MUSB_DEV_PM_OPS,
2953 		.dev_groups	= musb_groups,
2954 	},
2955 	.probe		= musb_probe,
2956 	.remove_new	= musb_remove,
2957 };
2958 
2959 module_platform_driver(musb_driver);
2960