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Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[deliverable/linux.git] / drivers / usb / dwc3 / core.c
1 /**
2 * core.c - DesignWare USB3 DRD Controller Core file
3 *
4 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
5 *
6 * Authors: Felipe Balbi <balbi@ti.com>,
7 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
8 *
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 of
11 * the License as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include <linux/version.h>
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/spinlock.h>
27 #include <linux/platform_device.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/interrupt.h>
30 #include <linux/ioport.h>
31 #include <linux/io.h>
32 #include <linux/list.h>
33 #include <linux/delay.h>
34 #include <linux/dma-mapping.h>
35 #include <linux/of.h>
36 #include <linux/acpi.h>
37
38 #include <linux/usb/ch9.h>
39 #include <linux/usb/gadget.h>
40 #include <linux/usb/of.h>
41 #include <linux/usb/otg.h>
42
43 #include "platform_data.h"
44 #include "core.h"
45 #include "gadget.h"
46 #include "io.h"
47
48 #include "debug.h"
49
50 /* -------------------------------------------------------------------------- */
51
52 void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
53 {
54 u32 reg;
55
56 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
57 reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
58 reg |= DWC3_GCTL_PRTCAPDIR(mode);
59 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
60 }
61
62 /**
63 * dwc3_core_soft_reset - Issues core soft reset and PHY reset
64 * @dwc: pointer to our context structure
65 */
66 static int dwc3_core_soft_reset(struct dwc3 *dwc)
67 {
68 u32 reg;
69 int ret;
70
71 /* Before Resetting PHY, put Core in Reset */
72 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
73 reg |= DWC3_GCTL_CORESOFTRESET;
74 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
75
76 /* Assert USB3 PHY reset */
77 reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
78 reg |= DWC3_GUSB3PIPECTL_PHYSOFTRST;
79 dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
80
81 /* Assert USB2 PHY reset */
82 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
83 reg |= DWC3_GUSB2PHYCFG_PHYSOFTRST;
84 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
85
86 usb_phy_init(dwc->usb2_phy);
87 usb_phy_init(dwc->usb3_phy);
88 ret = phy_init(dwc->usb2_generic_phy);
89 if (ret < 0)
90 return ret;
91
92 ret = phy_init(dwc->usb3_generic_phy);
93 if (ret < 0) {
94 phy_exit(dwc->usb2_generic_phy);
95 return ret;
96 }
97 mdelay(100);
98
99 /* Clear USB3 PHY reset */
100 reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
101 reg &= ~DWC3_GUSB3PIPECTL_PHYSOFTRST;
102 dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
103
104 /* Clear USB2 PHY reset */
105 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
106 reg &= ~DWC3_GUSB2PHYCFG_PHYSOFTRST;
107 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
108
109 mdelay(100);
110
111 /* After PHYs are stable we can take Core out of reset state */
112 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
113 reg &= ~DWC3_GCTL_CORESOFTRESET;
114 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
115
116 return 0;
117 }
118
119 /**
120 * dwc3_free_one_event_buffer - Frees one event buffer
121 * @dwc: Pointer to our controller context structure
122 * @evt: Pointer to event buffer to be freed
123 */
124 static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
125 struct dwc3_event_buffer *evt)
126 {
127 dma_free_coherent(dwc->dev, evt->length, evt->buf, evt->dma);
128 }
129
130 /**
131 * dwc3_alloc_one_event_buffer - Allocates one event buffer structure
132 * @dwc: Pointer to our controller context structure
133 * @length: size of the event buffer
134 *
135 * Returns a pointer to the allocated event buffer structure on success
136 * otherwise ERR_PTR(errno).
137 */
138 static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc,
139 unsigned length)
140 {
141 struct dwc3_event_buffer *evt;
142
143 evt = devm_kzalloc(dwc->dev, sizeof(*evt), GFP_KERNEL);
144 if (!evt)
145 return ERR_PTR(-ENOMEM);
146
147 evt->dwc = dwc;
148 evt->length = length;
149 evt->buf = dma_alloc_coherent(dwc->dev, length,
150 &evt->dma, GFP_KERNEL);
151 if (!evt->buf)
152 return ERR_PTR(-ENOMEM);
153
154 return evt;
155 }
156
157 /**
158 * dwc3_free_event_buffers - frees all allocated event buffers
159 * @dwc: Pointer to our controller context structure
160 */
161 static void dwc3_free_event_buffers(struct dwc3 *dwc)
162 {
163 struct dwc3_event_buffer *evt;
164 int i;
165
166 for (i = 0; i < dwc->num_event_buffers; i++) {
167 evt = dwc->ev_buffs[i];
168 if (evt)
169 dwc3_free_one_event_buffer(dwc, evt);
170 }
171 }
172
173 /**
174 * dwc3_alloc_event_buffers - Allocates @num event buffers of size @length
175 * @dwc: pointer to our controller context structure
176 * @length: size of event buffer
177 *
178 * Returns 0 on success otherwise negative errno. In the error case, dwc
179 * may contain some buffers allocated but not all which were requested.
180 */
181 static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length)
182 {
183 int num;
184 int i;
185
186 num = DWC3_NUM_INT(dwc->hwparams.hwparams1);
187 dwc->num_event_buffers = num;
188
189 dwc->ev_buffs = devm_kzalloc(dwc->dev, sizeof(*dwc->ev_buffs) * num,
190 GFP_KERNEL);
191 if (!dwc->ev_buffs)
192 return -ENOMEM;
193
194 for (i = 0; i < num; i++) {
195 struct dwc3_event_buffer *evt;
196
197 evt = dwc3_alloc_one_event_buffer(dwc, length);
198 if (IS_ERR(evt)) {
199 dev_err(dwc->dev, "can't allocate event buffer\n");
200 return PTR_ERR(evt);
201 }
202 dwc->ev_buffs[i] = evt;
203 }
204
205 return 0;
206 }
207
208 /**
209 * dwc3_event_buffers_setup - setup our allocated event buffers
210 * @dwc: pointer to our controller context structure
211 *
212 * Returns 0 on success otherwise negative errno.
213 */
214 static int dwc3_event_buffers_setup(struct dwc3 *dwc)
215 {
216 struct dwc3_event_buffer *evt;
217 int n;
218
219 for (n = 0; n < dwc->num_event_buffers; n++) {
220 evt = dwc->ev_buffs[n];
221 dev_dbg(dwc->dev, "Event buf %p dma %08llx length %d\n",
222 evt->buf, (unsigned long long) evt->dma,
223 evt->length);
224
225 evt->lpos = 0;
226
227 dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(n),
228 lower_32_bits(evt->dma));
229 dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(n),
230 upper_32_bits(evt->dma));
231 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(n),
232 DWC3_GEVNTSIZ_SIZE(evt->length));
233 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(n), 0);
234 }
235
236 return 0;
237 }
238
239 static void dwc3_event_buffers_cleanup(struct dwc3 *dwc)
240 {
241 struct dwc3_event_buffer *evt;
242 int n;
243
244 for (n = 0; n < dwc->num_event_buffers; n++) {
245 evt = dwc->ev_buffs[n];
246
247 evt->lpos = 0;
248
249 dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(n), 0);
250 dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(n), 0);
251 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(n), DWC3_GEVNTSIZ_INTMASK
252 | DWC3_GEVNTSIZ_SIZE(0));
253 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(n), 0);
254 }
255 }
256
257 static int dwc3_alloc_scratch_buffers(struct dwc3 *dwc)
258 {
259 if (!dwc->has_hibernation)
260 return 0;
261
262 if (!dwc->nr_scratch)
263 return 0;
264
265 dwc->scratchbuf = kmalloc_array(dwc->nr_scratch,
266 DWC3_SCRATCHBUF_SIZE, GFP_KERNEL);
267 if (!dwc->scratchbuf)
268 return -ENOMEM;
269
270 return 0;
271 }
272
273 static int dwc3_setup_scratch_buffers(struct dwc3 *dwc)
274 {
275 dma_addr_t scratch_addr;
276 u32 param;
277 int ret;
278
279 if (!dwc->has_hibernation)
280 return 0;
281
282 if (!dwc->nr_scratch)
283 return 0;
284
285 /* should never fall here */
286 if (!WARN_ON(dwc->scratchbuf))
287 return 0;
288
289 scratch_addr = dma_map_single(dwc->dev, dwc->scratchbuf,
290 dwc->nr_scratch * DWC3_SCRATCHBUF_SIZE,
291 DMA_BIDIRECTIONAL);
292 if (dma_mapping_error(dwc->dev, scratch_addr)) {
293 dev_err(dwc->dev, "failed to map scratch buffer\n");
294 ret = -EFAULT;
295 goto err0;
296 }
297
298 dwc->scratch_addr = scratch_addr;
299
300 param = lower_32_bits(scratch_addr);
301
302 ret = dwc3_send_gadget_generic_command(dwc,
303 DWC3_DGCMD_SET_SCRATCHPAD_ADDR_LO, param);
304 if (ret < 0)
305 goto err1;
306
307 param = upper_32_bits(scratch_addr);
308
309 ret = dwc3_send_gadget_generic_command(dwc,
310 DWC3_DGCMD_SET_SCRATCHPAD_ADDR_HI, param);
311 if (ret < 0)
312 goto err1;
313
314 return 0;
315
316 err1:
317 dma_unmap_single(dwc->dev, dwc->scratch_addr, dwc->nr_scratch *
318 DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
319
320 err0:
321 return ret;
322 }
323
324 static void dwc3_free_scratch_buffers(struct dwc3 *dwc)
325 {
326 if (!dwc->has_hibernation)
327 return;
328
329 if (!dwc->nr_scratch)
330 return;
331
332 /* should never fall here */
333 if (!WARN_ON(dwc->scratchbuf))
334 return;
335
336 dma_unmap_single(dwc->dev, dwc->scratch_addr, dwc->nr_scratch *
337 DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
338 kfree(dwc->scratchbuf);
339 }
340
341 static void dwc3_core_num_eps(struct dwc3 *dwc)
342 {
343 struct dwc3_hwparams *parms = &dwc->hwparams;
344
345 dwc->num_in_eps = DWC3_NUM_IN_EPS(parms);
346 dwc->num_out_eps = DWC3_NUM_EPS(parms) - dwc->num_in_eps;
347
348 dwc3_trace(trace_dwc3_core, "found %d IN and %d OUT endpoints",
349 dwc->num_in_eps, dwc->num_out_eps);
350 }
351
352 static void dwc3_cache_hwparams(struct dwc3 *dwc)
353 {
354 struct dwc3_hwparams *parms = &dwc->hwparams;
355
356 parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0);
357 parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1);
358 parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2);
359 parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3);
360 parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4);
361 parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5);
362 parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6);
363 parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7);
364 parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8);
365 }
366
367 /**
368 * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core
369 * @dwc: Pointer to our controller context structure
370 */
371 static void dwc3_phy_setup(struct dwc3 *dwc)
372 {
373 u32 reg;
374
375 reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
376
377 /*
378 * Above 1.94a, it is recommended to set DWC3_GUSB3PIPECTL_SUSPHY
379 * to '0' during coreConsultant configuration. So default value
380 * will be '0' when the core is reset. Application needs to set it
381 * to '1' after the core initialization is completed.
382 */
383 if (dwc->revision > DWC3_REVISION_194A)
384 reg |= DWC3_GUSB3PIPECTL_SUSPHY;
385
386 if (dwc->u2ss_inp3_quirk)
387 reg |= DWC3_GUSB3PIPECTL_U2SSINP3OK;
388
389 if (dwc->req_p1p2p3_quirk)
390 reg |= DWC3_GUSB3PIPECTL_REQP1P2P3;
391
392 if (dwc->del_p1p2p3_quirk)
393 reg |= DWC3_GUSB3PIPECTL_DEP1P2P3_EN;
394
395 if (dwc->del_phy_power_chg_quirk)
396 reg |= DWC3_GUSB3PIPECTL_DEPOCHANGE;
397
398 if (dwc->lfps_filter_quirk)
399 reg |= DWC3_GUSB3PIPECTL_LFPSFILT;
400
401 if (dwc->rx_detect_poll_quirk)
402 reg |= DWC3_GUSB3PIPECTL_RX_DETOPOLL;
403
404 if (dwc->tx_de_emphasis_quirk)
405 reg |= DWC3_GUSB3PIPECTL_TX_DEEPH(dwc->tx_de_emphasis);
406
407 if (dwc->dis_u3_susphy_quirk)
408 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
409
410 dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
411
412 mdelay(100);
413
414 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
415
416 /*
417 * Above 1.94a, it is recommended to set DWC3_GUSB2PHYCFG_SUSPHY to
418 * '0' during coreConsultant configuration. So default value will
419 * be '0' when the core is reset. Application needs to set it to
420 * '1' after the core initialization is completed.
421 */
422 if (dwc->revision > DWC3_REVISION_194A)
423 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
424
425 if (dwc->dis_u2_susphy_quirk)
426 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
427
428 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
429
430 mdelay(100);
431 }
432
433 /**
434 * dwc3_core_init - Low-level initialization of DWC3 Core
435 * @dwc: Pointer to our controller context structure
436 *
437 * Returns 0 on success otherwise negative errno.
438 */
439 static int dwc3_core_init(struct dwc3 *dwc)
440 {
441 unsigned long timeout;
442 u32 hwparams4 = dwc->hwparams.hwparams4;
443 u32 reg;
444 int ret;
445
446 reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
447 /* This should read as U3 followed by revision number */
448 if ((reg & DWC3_GSNPSID_MASK) != 0x55330000) {
449 dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
450 ret = -ENODEV;
451 goto err0;
452 }
453 dwc->revision = reg;
454
455 /*
456 * Write Linux Version Code to our GUID register so it's easy to figure
457 * out which kernel version a bug was found.
458 */
459 dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE);
460
461 /* Handle USB2.0-only core configuration */
462 if (DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3) ==
463 DWC3_GHWPARAMS3_SSPHY_IFC_DIS) {
464 if (dwc->maximum_speed == USB_SPEED_SUPER)
465 dwc->maximum_speed = USB_SPEED_HIGH;
466 }
467
468 /* issue device SoftReset too */
469 timeout = jiffies + msecs_to_jiffies(500);
470 dwc3_writel(dwc->regs, DWC3_DCTL, DWC3_DCTL_CSFTRST);
471 do {
472 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
473 if (!(reg & DWC3_DCTL_CSFTRST))
474 break;
475
476 if (time_after(jiffies, timeout)) {
477 dev_err(dwc->dev, "Reset Timed Out\n");
478 ret = -ETIMEDOUT;
479 goto err0;
480 }
481
482 cpu_relax();
483 } while (true);
484
485 ret = dwc3_core_soft_reset(dwc);
486 if (ret)
487 goto err0;
488
489 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
490 reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
491
492 switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) {
493 case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
494 /**
495 * WORKAROUND: DWC3 revisions between 2.10a and 2.50a have an
496 * issue which would cause xHCI compliance tests to fail.
497 *
498 * Because of that we cannot enable clock gating on such
499 * configurations.
500 *
501 * Refers to:
502 *
503 * STAR#9000588375: Clock Gating, SOF Issues when ref_clk-Based
504 * SOF/ITP Mode Used
505 */
506 if ((dwc->dr_mode == USB_DR_MODE_HOST ||
507 dwc->dr_mode == USB_DR_MODE_OTG) &&
508 (dwc->revision >= DWC3_REVISION_210A &&
509 dwc->revision <= DWC3_REVISION_250A))
510 reg |= DWC3_GCTL_DSBLCLKGTNG | DWC3_GCTL_SOFITPSYNC;
511 else
512 reg &= ~DWC3_GCTL_DSBLCLKGTNG;
513 break;
514 case DWC3_GHWPARAMS1_EN_PWROPT_HIB:
515 /* enable hibernation here */
516 dwc->nr_scratch = DWC3_GHWPARAMS4_HIBER_SCRATCHBUFS(hwparams4);
517
518 /*
519 * REVISIT Enabling this bit so that host-mode hibernation
520 * will work. Device-mode hibernation is not yet implemented.
521 */
522 reg |= DWC3_GCTL_GBLHIBERNATIONEN;
523 break;
524 default:
525 dev_dbg(dwc->dev, "No power optimization available\n");
526 }
527
528 /* check if current dwc3 is on simulation board */
529 if (dwc->hwparams.hwparams6 & DWC3_GHWPARAMS6_EN_FPGA) {
530 dev_dbg(dwc->dev, "it is on FPGA board\n");
531 dwc->is_fpga = true;
532 }
533
534 WARN_ONCE(dwc->disable_scramble_quirk && !dwc->is_fpga,
535 "disable_scramble cannot be used on non-FPGA builds\n");
536
537 if (dwc->disable_scramble_quirk && dwc->is_fpga)
538 reg |= DWC3_GCTL_DISSCRAMBLE;
539 else
540 reg &= ~DWC3_GCTL_DISSCRAMBLE;
541
542 if (dwc->u2exit_lfps_quirk)
543 reg |= DWC3_GCTL_U2EXIT_LFPS;
544
545 /*
546 * WORKAROUND: DWC3 revisions <1.90a have a bug
547 * where the device can fail to connect at SuperSpeed
548 * and falls back to high-speed mode which causes
549 * the device to enter a Connect/Disconnect loop
550 */
551 if (dwc->revision < DWC3_REVISION_190A)
552 reg |= DWC3_GCTL_U2RSTECN;
553
554 dwc3_core_num_eps(dwc);
555
556 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
557
558 dwc3_phy_setup(dwc);
559
560 ret = dwc3_alloc_scratch_buffers(dwc);
561 if (ret)
562 goto err1;
563
564 ret = dwc3_setup_scratch_buffers(dwc);
565 if (ret)
566 goto err2;
567
568 return 0;
569
570 err2:
571 dwc3_free_scratch_buffers(dwc);
572
573 err1:
574 usb_phy_shutdown(dwc->usb2_phy);
575 usb_phy_shutdown(dwc->usb3_phy);
576 phy_exit(dwc->usb2_generic_phy);
577 phy_exit(dwc->usb3_generic_phy);
578
579 err0:
580 return ret;
581 }
582
583 static void dwc3_core_exit(struct dwc3 *dwc)
584 {
585 dwc3_free_scratch_buffers(dwc);
586 usb_phy_shutdown(dwc->usb2_phy);
587 usb_phy_shutdown(dwc->usb3_phy);
588 phy_exit(dwc->usb2_generic_phy);
589 phy_exit(dwc->usb3_generic_phy);
590 }
591
592 static int dwc3_core_get_phy(struct dwc3 *dwc)
593 {
594 struct device *dev = dwc->dev;
595 struct device_node *node = dev->of_node;
596 int ret;
597
598 if (node) {
599 dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
600 dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
601 } else {
602 dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
603 dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
604 }
605
606 if (IS_ERR(dwc->usb2_phy)) {
607 ret = PTR_ERR(dwc->usb2_phy);
608 if (ret == -ENXIO || ret == -ENODEV) {
609 dwc->usb2_phy = NULL;
610 } else if (ret == -EPROBE_DEFER) {
611 return ret;
612 } else {
613 dev_err(dev, "no usb2 phy configured\n");
614 return ret;
615 }
616 }
617
618 if (IS_ERR(dwc->usb3_phy)) {
619 ret = PTR_ERR(dwc->usb3_phy);
620 if (ret == -ENXIO || ret == -ENODEV) {
621 dwc->usb3_phy = NULL;
622 } else if (ret == -EPROBE_DEFER) {
623 return ret;
624 } else {
625 dev_err(dev, "no usb3 phy configured\n");
626 return ret;
627 }
628 }
629
630 dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
631 if (IS_ERR(dwc->usb2_generic_phy)) {
632 ret = PTR_ERR(dwc->usb2_generic_phy);
633 if (ret == -ENOSYS || ret == -ENODEV) {
634 dwc->usb2_generic_phy = NULL;
635 } else if (ret == -EPROBE_DEFER) {
636 return ret;
637 } else {
638 dev_err(dev, "no usb2 phy configured\n");
639 return ret;
640 }
641 }
642
643 dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
644 if (IS_ERR(dwc->usb3_generic_phy)) {
645 ret = PTR_ERR(dwc->usb3_generic_phy);
646 if (ret == -ENOSYS || ret == -ENODEV) {
647 dwc->usb3_generic_phy = NULL;
648 } else if (ret == -EPROBE_DEFER) {
649 return ret;
650 } else {
651 dev_err(dev, "no usb3 phy configured\n");
652 return ret;
653 }
654 }
655
656 return 0;
657 }
658
659 static int dwc3_core_init_mode(struct dwc3 *dwc)
660 {
661 struct device *dev = dwc->dev;
662 int ret;
663
664 switch (dwc->dr_mode) {
665 case USB_DR_MODE_PERIPHERAL:
666 dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
667 ret = dwc3_gadget_init(dwc);
668 if (ret) {
669 dev_err(dev, "failed to initialize gadget\n");
670 return ret;
671 }
672 break;
673 case USB_DR_MODE_HOST:
674 dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST);
675 ret = dwc3_host_init(dwc);
676 if (ret) {
677 dev_err(dev, "failed to initialize host\n");
678 return ret;
679 }
680 break;
681 case USB_DR_MODE_OTG:
682 dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
683 ret = dwc3_host_init(dwc);
684 if (ret) {
685 dev_err(dev, "failed to initialize host\n");
686 return ret;
687 }
688
689 ret = dwc3_gadget_init(dwc);
690 if (ret) {
691 dev_err(dev, "failed to initialize gadget\n");
692 return ret;
693 }
694 break;
695 default:
696 dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode);
697 return -EINVAL;
698 }
699
700 return 0;
701 }
702
703 static void dwc3_core_exit_mode(struct dwc3 *dwc)
704 {
705 switch (dwc->dr_mode) {
706 case USB_DR_MODE_PERIPHERAL:
707 dwc3_gadget_exit(dwc);
708 break;
709 case USB_DR_MODE_HOST:
710 dwc3_host_exit(dwc);
711 break;
712 case USB_DR_MODE_OTG:
713 dwc3_host_exit(dwc);
714 dwc3_gadget_exit(dwc);
715 break;
716 default:
717 /* do nothing */
718 break;
719 }
720 }
721
722 #define DWC3_ALIGN_MASK (16 - 1)
723
724 static int dwc3_probe(struct platform_device *pdev)
725 {
726 struct device *dev = &pdev->dev;
727 struct dwc3_platform_data *pdata = dev_get_platdata(dev);
728 struct device_node *node = dev->of_node;
729 struct resource *res;
730 struct dwc3 *dwc;
731 u8 lpm_nyet_threshold;
732 u8 tx_de_emphasis;
733 u8 hird_threshold;
734
735 int ret;
736
737 void __iomem *regs;
738 void *mem;
739
740 mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
741 if (!mem)
742 return -ENOMEM;
743
744 dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
745 dwc->mem = mem;
746 dwc->dev = dev;
747
748 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
749 if (!res) {
750 dev_err(dev, "missing IRQ\n");
751 return -ENODEV;
752 }
753 dwc->xhci_resources[1].start = res->start;
754 dwc->xhci_resources[1].end = res->end;
755 dwc->xhci_resources[1].flags = res->flags;
756 dwc->xhci_resources[1].name = res->name;
757
758 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
759 if (!res) {
760 dev_err(dev, "missing memory resource\n");
761 return -ENODEV;
762 }
763
764 dwc->xhci_resources[0].start = res->start;
765 dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
766 DWC3_XHCI_REGS_END;
767 dwc->xhci_resources[0].flags = res->flags;
768 dwc->xhci_resources[0].name = res->name;
769
770 res->start += DWC3_GLOBALS_REGS_START;
771
772 /*
773 * Request memory region but exclude xHCI regs,
774 * since it will be requested by the xhci-plat driver.
775 */
776 regs = devm_ioremap_resource(dev, res);
777 if (IS_ERR(regs)) {
778 ret = PTR_ERR(regs);
779 goto err0;
780 }
781
782 dwc->regs = regs;
783 dwc->regs_size = resource_size(res);
784
785 /* default to highest possible threshold */
786 lpm_nyet_threshold = 0xff;
787
788 /* default to -3.5dB de-emphasis */
789 tx_de_emphasis = 1;
790
791 /*
792 * default to assert utmi_sleep_n and use maximum allowed HIRD
793 * threshold value of 0b1100
794 */
795 hird_threshold = 12;
796
797 if (node) {
798 dwc->maximum_speed = of_usb_get_maximum_speed(node);
799 dwc->has_lpm_erratum = of_property_read_bool(node,
800 "snps,has-lpm-erratum");
801 of_property_read_u8(node, "snps,lpm-nyet-threshold",
802 &lpm_nyet_threshold);
803 dwc->is_utmi_l1_suspend = of_property_read_bool(node,
804 "snps,is-utmi-l1-suspend");
805 of_property_read_u8(node, "snps,hird-threshold",
806 &hird_threshold);
807 dwc->usb3_lpm_capable = of_property_read_bool(node,
808 "snps,usb3_lpm_capable");
809
810 dwc->needs_fifo_resize = of_property_read_bool(node,
811 "tx-fifo-resize");
812 dwc->dr_mode = of_usb_get_dr_mode(node);
813
814 dwc->disable_scramble_quirk = of_property_read_bool(node,
815 "snps,disable_scramble_quirk");
816 dwc->u2exit_lfps_quirk = of_property_read_bool(node,
817 "snps,u2exit_lfps_quirk");
818 dwc->u2ss_inp3_quirk = of_property_read_bool(node,
819 "snps,u2ss_inp3_quirk");
820 dwc->req_p1p2p3_quirk = of_property_read_bool(node,
821 "snps,req_p1p2p3_quirk");
822 dwc->del_p1p2p3_quirk = of_property_read_bool(node,
823 "snps,del_p1p2p3_quirk");
824 dwc->del_phy_power_chg_quirk = of_property_read_bool(node,
825 "snps,del_phy_power_chg_quirk");
826 dwc->lfps_filter_quirk = of_property_read_bool(node,
827 "snps,lfps_filter_quirk");
828 dwc->rx_detect_poll_quirk = of_property_read_bool(node,
829 "snps,rx_detect_poll_quirk");
830 dwc->dis_u3_susphy_quirk = of_property_read_bool(node,
831 "snps,dis_u3_susphy_quirk");
832 dwc->dis_u2_susphy_quirk = of_property_read_bool(node,
833 "snps,dis_u2_susphy_quirk");
834
835 dwc->tx_de_emphasis_quirk = of_property_read_bool(node,
836 "snps,tx_de_emphasis_quirk");
837 of_property_read_u8(node, "snps,tx_de_emphasis",
838 &tx_de_emphasis);
839 } else if (pdata) {
840 dwc->maximum_speed = pdata->maximum_speed;
841 dwc->has_lpm_erratum = pdata->has_lpm_erratum;
842 if (pdata->lpm_nyet_threshold)
843 lpm_nyet_threshold = pdata->lpm_nyet_threshold;
844 dwc->is_utmi_l1_suspend = pdata->is_utmi_l1_suspend;
845 if (pdata->hird_threshold)
846 hird_threshold = pdata->hird_threshold;
847
848 dwc->needs_fifo_resize = pdata->tx_fifo_resize;
849 dwc->usb3_lpm_capable = pdata->usb3_lpm_capable;
850 dwc->dr_mode = pdata->dr_mode;
851
852 dwc->disable_scramble_quirk = pdata->disable_scramble_quirk;
853 dwc->u2exit_lfps_quirk = pdata->u2exit_lfps_quirk;
854 dwc->u2ss_inp3_quirk = pdata->u2ss_inp3_quirk;
855 dwc->req_p1p2p3_quirk = pdata->req_p1p2p3_quirk;
856 dwc->del_p1p2p3_quirk = pdata->del_p1p2p3_quirk;
857 dwc->del_phy_power_chg_quirk = pdata->del_phy_power_chg_quirk;
858 dwc->lfps_filter_quirk = pdata->lfps_filter_quirk;
859 dwc->rx_detect_poll_quirk = pdata->rx_detect_poll_quirk;
860 dwc->dis_u3_susphy_quirk = pdata->dis_u3_susphy_quirk;
861 dwc->dis_u2_susphy_quirk = pdata->dis_u2_susphy_quirk;
862
863 dwc->tx_de_emphasis_quirk = pdata->tx_de_emphasis_quirk;
864 if (pdata->tx_de_emphasis)
865 tx_de_emphasis = pdata->tx_de_emphasis;
866 }
867
868 /* default to superspeed if no maximum_speed passed */
869 if (dwc->maximum_speed == USB_SPEED_UNKNOWN)
870 dwc->maximum_speed = USB_SPEED_SUPER;
871
872 dwc->lpm_nyet_threshold = lpm_nyet_threshold;
873 dwc->tx_de_emphasis = tx_de_emphasis;
874
875 dwc->hird_threshold = hird_threshold
876 | (dwc->is_utmi_l1_suspend << 4);
877
878 ret = dwc3_core_get_phy(dwc);
879 if (ret)
880 goto err0;
881
882 spin_lock_init(&dwc->lock);
883 platform_set_drvdata(pdev, dwc);
884
885 if (!dev->dma_mask) {
886 dev->dma_mask = dev->parent->dma_mask;
887 dev->dma_parms = dev->parent->dma_parms;
888 dma_set_coherent_mask(dev, dev->parent->coherent_dma_mask);
889 }
890
891 pm_runtime_enable(dev);
892 pm_runtime_get_sync(dev);
893 pm_runtime_forbid(dev);
894
895 dwc3_cache_hwparams(dwc);
896
897 ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
898 if (ret) {
899 dev_err(dwc->dev, "failed to allocate event buffers\n");
900 ret = -ENOMEM;
901 goto err1;
902 }
903
904 if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
905 dwc->dr_mode = USB_DR_MODE_HOST;
906 else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
907 dwc->dr_mode = USB_DR_MODE_PERIPHERAL;
908
909 if (dwc->dr_mode == USB_DR_MODE_UNKNOWN)
910 dwc->dr_mode = USB_DR_MODE_OTG;
911
912 ret = dwc3_core_init(dwc);
913 if (ret) {
914 dev_err(dev, "failed to initialize core\n");
915 goto err1;
916 }
917
918 usb_phy_set_suspend(dwc->usb2_phy, 0);
919 usb_phy_set_suspend(dwc->usb3_phy, 0);
920 ret = phy_power_on(dwc->usb2_generic_phy);
921 if (ret < 0)
922 goto err2;
923
924 ret = phy_power_on(dwc->usb3_generic_phy);
925 if (ret < 0)
926 goto err3;
927
928 ret = dwc3_event_buffers_setup(dwc);
929 if (ret) {
930 dev_err(dwc->dev, "failed to setup event buffers\n");
931 goto err4;
932 }
933
934 ret = dwc3_core_init_mode(dwc);
935 if (ret)
936 goto err5;
937
938 ret = dwc3_debugfs_init(dwc);
939 if (ret) {
940 dev_err(dev, "failed to initialize debugfs\n");
941 goto err6;
942 }
943
944 pm_runtime_allow(dev);
945
946 return 0;
947
948 err6:
949 dwc3_core_exit_mode(dwc);
950
951 err5:
952 dwc3_event_buffers_cleanup(dwc);
953
954 err4:
955 phy_power_off(dwc->usb3_generic_phy);
956
957 err3:
958 phy_power_off(dwc->usb2_generic_phy);
959
960 err2:
961 usb_phy_set_suspend(dwc->usb2_phy, 1);
962 usb_phy_set_suspend(dwc->usb3_phy, 1);
963 dwc3_core_exit(dwc);
964
965 err1:
966 dwc3_free_event_buffers(dwc);
967
968 err0:
969 /*
970 * restore res->start back to its original value so that, in case the
971 * probe is deferred, we don't end up getting error in request the
972 * memory region the next time probe is called.
973 */
974 res->start -= DWC3_GLOBALS_REGS_START;
975
976 return ret;
977 }
978
979 static int dwc3_remove(struct platform_device *pdev)
980 {
981 struct dwc3 *dwc = platform_get_drvdata(pdev);
982 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
983
984 /*
985 * restore res->start back to its original value so that, in case the
986 * probe is deferred, we don't end up getting error in request the
987 * memory region the next time probe is called.
988 */
989 res->start -= DWC3_GLOBALS_REGS_START;
990
991 dwc3_debugfs_exit(dwc);
992 dwc3_core_exit_mode(dwc);
993 dwc3_event_buffers_cleanup(dwc);
994 dwc3_free_event_buffers(dwc);
995
996 usb_phy_set_suspend(dwc->usb2_phy, 1);
997 usb_phy_set_suspend(dwc->usb3_phy, 1);
998 phy_power_off(dwc->usb2_generic_phy);
999 phy_power_off(dwc->usb3_generic_phy);
1000
1001 dwc3_core_exit(dwc);
1002
1003 pm_runtime_put_sync(&pdev->dev);
1004 pm_runtime_disable(&pdev->dev);
1005
1006 return 0;
1007 }
1008
1009 #ifdef CONFIG_PM_SLEEP
1010 static int dwc3_suspend(struct device *dev)
1011 {
1012 struct dwc3 *dwc = dev_get_drvdata(dev);
1013 unsigned long flags;
1014
1015 spin_lock_irqsave(&dwc->lock, flags);
1016
1017 switch (dwc->dr_mode) {
1018 case USB_DR_MODE_PERIPHERAL:
1019 case USB_DR_MODE_OTG:
1020 dwc3_gadget_suspend(dwc);
1021 /* FALLTHROUGH */
1022 case USB_DR_MODE_HOST:
1023 default:
1024 dwc3_event_buffers_cleanup(dwc);
1025 break;
1026 }
1027
1028 dwc->gctl = dwc3_readl(dwc->regs, DWC3_GCTL);
1029 spin_unlock_irqrestore(&dwc->lock, flags);
1030
1031 usb_phy_shutdown(dwc->usb3_phy);
1032 usb_phy_shutdown(dwc->usb2_phy);
1033 phy_exit(dwc->usb2_generic_phy);
1034 phy_exit(dwc->usb3_generic_phy);
1035
1036 return 0;
1037 }
1038
1039 static int dwc3_resume(struct device *dev)
1040 {
1041 struct dwc3 *dwc = dev_get_drvdata(dev);
1042 unsigned long flags;
1043 int ret;
1044
1045 usb_phy_init(dwc->usb3_phy);
1046 usb_phy_init(dwc->usb2_phy);
1047 ret = phy_init(dwc->usb2_generic_phy);
1048 if (ret < 0)
1049 return ret;
1050
1051 ret = phy_init(dwc->usb3_generic_phy);
1052 if (ret < 0)
1053 goto err_usb2phy_init;
1054
1055 spin_lock_irqsave(&dwc->lock, flags);
1056
1057 dwc3_event_buffers_setup(dwc);
1058 dwc3_writel(dwc->regs, DWC3_GCTL, dwc->gctl);
1059
1060 switch (dwc->dr_mode) {
1061 case USB_DR_MODE_PERIPHERAL:
1062 case USB_DR_MODE_OTG:
1063 dwc3_gadget_resume(dwc);
1064 /* FALLTHROUGH */
1065 case USB_DR_MODE_HOST:
1066 default:
1067 /* do nothing */
1068 break;
1069 }
1070
1071 spin_unlock_irqrestore(&dwc->lock, flags);
1072
1073 pm_runtime_disable(dev);
1074 pm_runtime_set_active(dev);
1075 pm_runtime_enable(dev);
1076
1077 return 0;
1078
1079 err_usb2phy_init:
1080 phy_exit(dwc->usb2_generic_phy);
1081
1082 return ret;
1083 }
1084
1085 static const struct dev_pm_ops dwc3_dev_pm_ops = {
1086 SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume)
1087 };
1088
1089 #define DWC3_PM_OPS &(dwc3_dev_pm_ops)
1090 #else
1091 #define DWC3_PM_OPS NULL
1092 #endif
1093
1094 #ifdef CONFIG_OF
1095 static const struct of_device_id of_dwc3_match[] = {
1096 {
1097 .compatible = "snps,dwc3"
1098 },
1099 {
1100 .compatible = "synopsys,dwc3"
1101 },
1102 { },
1103 };
1104 MODULE_DEVICE_TABLE(of, of_dwc3_match);
1105 #endif
1106
1107 #ifdef CONFIG_ACPI
1108
1109 #define ACPI_ID_INTEL_BSW "808622B7"
1110
1111 static const struct acpi_device_id dwc3_acpi_match[] = {
1112 { ACPI_ID_INTEL_BSW, 0 },
1113 { },
1114 };
1115 MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match);
1116 #endif
1117
1118 static struct platform_driver dwc3_driver = {
1119 .probe = dwc3_probe,
1120 .remove = dwc3_remove,
1121 .driver = {
1122 .name = "dwc3",
1123 .of_match_table = of_match_ptr(of_dwc3_match),
1124 .acpi_match_table = ACPI_PTR(dwc3_acpi_match),
1125 .pm = DWC3_PM_OPS,
1126 },
1127 };
1128
1129 module_platform_driver(dwc3_driver);
1130
1131 MODULE_ALIAS("platform:dwc3");
1132 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
1133 MODULE_LICENSE("GPL v2");
1134 MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver");
Linux kernel - Deliverables
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