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11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/slab.h>
14#include <linux/irq.h>
15#include <linux/interrupt.h>
16#include <linux/platform_device.h>
17#include <linux/platform_data/dwc3-omap.h>
18#include <linux/pm_runtime.h>
19#include <linux/dma-mapping.h>
20#include <linux/ioport.h>
21#include <linux/io.h>
22#include <linux/of.h>
23#include <linux/of_platform.h>
24#include <linux/extcon.h>
25#include <linux/regulator/consumer.h>
26
27#include <linux/usb/otg.h>
28
29
30
31
32
33
34#define USBOTGSS_REVISION 0x0000
35#define USBOTGSS_SYSCONFIG 0x0010
36#define USBOTGSS_IRQ_EOI 0x0020
37#define USBOTGSS_EOI_OFFSET 0x0008
38#define USBOTGSS_IRQSTATUS_RAW_0 0x0024
39#define USBOTGSS_IRQSTATUS_0 0x0028
40#define USBOTGSS_IRQENABLE_SET_0 0x002c
41#define USBOTGSS_IRQENABLE_CLR_0 0x0030
42#define USBOTGSS_IRQ0_OFFSET 0x0004
43#define USBOTGSS_IRQSTATUS_RAW_1 0x0030
44#define USBOTGSS_IRQSTATUS_1 0x0034
45#define USBOTGSS_IRQENABLE_SET_1 0x0038
46#define USBOTGSS_IRQENABLE_CLR_1 0x003c
47#define USBOTGSS_IRQSTATUS_RAW_2 0x0040
48#define USBOTGSS_IRQSTATUS_2 0x0044
49#define USBOTGSS_IRQENABLE_SET_2 0x0048
50#define USBOTGSS_IRQENABLE_CLR_2 0x004c
51#define USBOTGSS_IRQSTATUS_RAW_3 0x0050
52#define USBOTGSS_IRQSTATUS_3 0x0054
53#define USBOTGSS_IRQENABLE_SET_3 0x0058
54#define USBOTGSS_IRQENABLE_CLR_3 0x005c
55#define USBOTGSS_IRQSTATUS_EOI_MISC 0x0030
56#define USBOTGSS_IRQSTATUS_RAW_MISC 0x0034
57#define USBOTGSS_IRQSTATUS_MISC 0x0038
58#define USBOTGSS_IRQENABLE_SET_MISC 0x003c
59#define USBOTGSS_IRQENABLE_CLR_MISC 0x0040
60#define USBOTGSS_IRQMISC_OFFSET 0x03fc
61#define USBOTGSS_UTMI_OTG_STATUS 0x0080
62#define USBOTGSS_UTMI_OTG_CTRL 0x0084
63#define USBOTGSS_UTMI_OTG_OFFSET 0x0480
64#define USBOTGSS_TXFIFO_DEPTH 0x0508
65#define USBOTGSS_RXFIFO_DEPTH 0x050c
66#define USBOTGSS_MMRAM_OFFSET 0x0100
67#define USBOTGSS_FLADJ 0x0104
68#define USBOTGSS_DEBUG_CFG 0x0108
69#define USBOTGSS_DEBUG_DATA 0x010c
70#define USBOTGSS_DEV_EBC_EN 0x0110
71#define USBOTGSS_DEBUG_OFFSET 0x0600
72
73
74#define USBOTGSS_SYSCONFIG_DMADISABLE BIT(16)
75
76
77#define USBOTGSS_IRQ_EOI_LINE_NUMBER BIT(0)
78
79
80#define USBOTGSS_IRQO_COREIRQ_ST BIT(0)
81
82
83#define USBOTGSS_IRQMISC_DMADISABLECLR BIT(17)
84#define USBOTGSS_IRQMISC_OEVT BIT(16)
85#define USBOTGSS_IRQMISC_DRVVBUS_RISE BIT(13)
86#define USBOTGSS_IRQMISC_CHRGVBUS_RISE BIT(12)
87#define USBOTGSS_IRQMISC_DISCHRGVBUS_RISE BIT(11)
88#define USBOTGSS_IRQMISC_IDPULLUP_RISE BIT(8)
89#define USBOTGSS_IRQMISC_DRVVBUS_FALL BIT(5)
90#define USBOTGSS_IRQMISC_CHRGVBUS_FALL BIT(4)
91#define USBOTGSS_IRQMISC_DISCHRGVBUS_FALL BIT(3)
92#define USBOTGSS_IRQMISC_IDPULLUP_FALL BIT(0)
93
94
95#define USBOTGSS_UTMI_OTG_STATUS_DRVVBUS BIT(5)
96#define USBOTGSS_UTMI_OTG_STATUS_CHRGVBUS BIT(4)
97#define USBOTGSS_UTMI_OTG_STATUS_DISCHRGVBUS BIT(3)
98#define USBOTGSS_UTMI_OTG_STATUS_IDPULLUP BIT(0)
99
100
101#define USBOTGSS_UTMI_OTG_CTRL_SW_MODE BIT(31)
102#define USBOTGSS_UTMI_OTG_CTRL_POWERPRESENT BIT(9)
103#define USBOTGSS_UTMI_OTG_CTRL_TXBITSTUFFENABLE BIT(8)
104#define USBOTGSS_UTMI_OTG_CTRL_IDDIG BIT(4)
105#define USBOTGSS_UTMI_OTG_CTRL_SESSEND BIT(3)
106#define USBOTGSS_UTMI_OTG_CTRL_SESSVALID BIT(2)
107#define USBOTGSS_UTMI_OTG_CTRL_VBUSVALID BIT(1)
108
109struct dwc3_omap {
110 struct device *dev;
111
112 int irq;
113 void __iomem *base;
114
115 u32 utmi_otg_ctrl;
116 u32 utmi_otg_offset;
117 u32 irqmisc_offset;
118 u32 irq_eoi_offset;
119 u32 debug_offset;
120 u32 irq0_offset;
121
122 struct extcon_dev *edev;
123 struct notifier_block vbus_nb;
124 struct notifier_block id_nb;
125
126 struct regulator *vbus_reg;
127};
128
129enum omap_dwc3_vbus_id_status {
130 OMAP_DWC3_ID_FLOAT,
131 OMAP_DWC3_ID_GROUND,
132 OMAP_DWC3_VBUS_OFF,
133 OMAP_DWC3_VBUS_VALID,
134};
135
136static inline u32 dwc3_omap_readl(void __iomem *base, u32 offset)
137{
138 return readl(base + offset);
139}
140
141static inline void dwc3_omap_writel(void __iomem *base, u32 offset, u32 value)
142{
143 writel(value, base + offset);
144}
145
146static u32 dwc3_omap_read_utmi_ctrl(struct dwc3_omap *omap)
147{
148 return dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_CTRL +
149 omap->utmi_otg_offset);
150}
151
152static void dwc3_omap_write_utmi_ctrl(struct dwc3_omap *omap, u32 value)
153{
154 dwc3_omap_writel(omap->base, USBOTGSS_UTMI_OTG_CTRL +
155 omap->utmi_otg_offset, value);
156
157}
158
159static u32 dwc3_omap_read_irq0_status(struct dwc3_omap *omap)
160{
161 return dwc3_omap_readl(omap->base, USBOTGSS_IRQSTATUS_RAW_0 -
162 omap->irq0_offset);
163}
164
165static void dwc3_omap_write_irq0_status(struct dwc3_omap *omap, u32 value)
166{
167 dwc3_omap_writel(omap->base, USBOTGSS_IRQSTATUS_0 -
168 omap->irq0_offset, value);
169
170}
171
172static u32 dwc3_omap_read_irqmisc_status(struct dwc3_omap *omap)
173{
174 return dwc3_omap_readl(omap->base, USBOTGSS_IRQSTATUS_RAW_MISC +
175 omap->irqmisc_offset);
176}
177
178static void dwc3_omap_write_irqmisc_status(struct dwc3_omap *omap, u32 value)
179{
180 dwc3_omap_writel(omap->base, USBOTGSS_IRQSTATUS_MISC +
181 omap->irqmisc_offset, value);
182
183}
184
185static void dwc3_omap_write_irqmisc_set(struct dwc3_omap *omap, u32 value)
186{
187 dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_SET_MISC +
188 omap->irqmisc_offset, value);
189
190}
191
192static void dwc3_omap_write_irq0_set(struct dwc3_omap *omap, u32 value)
193{
194 dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_SET_0 -
195 omap->irq0_offset, value);
196}
197
198static void dwc3_omap_write_irqmisc_clr(struct dwc3_omap *omap, u32 value)
199{
200 dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_CLR_MISC +
201 omap->irqmisc_offset, value);
202}
203
204static void dwc3_omap_write_irq0_clr(struct dwc3_omap *omap, u32 value)
205{
206 dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_CLR_0 -
207 omap->irq0_offset, value);
208}
209
210static void dwc3_omap_set_mailbox(struct dwc3_omap *omap,
211 enum omap_dwc3_vbus_id_status status)
212{
213 int ret;
214 u32 val;
215
216 switch (status) {
217 case OMAP_DWC3_ID_GROUND:
218 if (omap->vbus_reg) {
219 ret = regulator_enable(omap->vbus_reg);
220 if (ret) {
221 dev_err(omap->dev, "regulator enable failed\n");
222 return;
223 }
224 }
225
226 val = dwc3_omap_read_utmi_ctrl(omap);
227 val &= ~USBOTGSS_UTMI_OTG_CTRL_IDDIG;
228 dwc3_omap_write_utmi_ctrl(omap, val);
229 break;
230
231 case OMAP_DWC3_VBUS_VALID:
232 val = dwc3_omap_read_utmi_ctrl(omap);
233 val &= ~USBOTGSS_UTMI_OTG_CTRL_SESSEND;
234 val |= USBOTGSS_UTMI_OTG_CTRL_VBUSVALID
235 | USBOTGSS_UTMI_OTG_CTRL_SESSVALID;
236 dwc3_omap_write_utmi_ctrl(omap, val);
237 break;
238
239 case OMAP_DWC3_ID_FLOAT:
240 if (omap->vbus_reg)
241 regulator_disable(omap->vbus_reg);
242 val = dwc3_omap_read_utmi_ctrl(omap);
243 val |= USBOTGSS_UTMI_OTG_CTRL_IDDIG;
244 dwc3_omap_write_utmi_ctrl(omap, val);
245 break;
246
247 case OMAP_DWC3_VBUS_OFF:
248 val = dwc3_omap_read_utmi_ctrl(omap);
249 val &= ~(USBOTGSS_UTMI_OTG_CTRL_SESSVALID
250 | USBOTGSS_UTMI_OTG_CTRL_VBUSVALID);
251 val |= USBOTGSS_UTMI_OTG_CTRL_SESSEND;
252 dwc3_omap_write_utmi_ctrl(omap, val);
253 break;
254
255 default:
256 dev_WARN(omap->dev, "invalid state\n");
257 }
258}
259
260static void dwc3_omap_enable_irqs(struct dwc3_omap *omap);
261static void dwc3_omap_disable_irqs(struct dwc3_omap *omap);
262
263static irqreturn_t dwc3_omap_interrupt(int irq, void *_omap)
264{
265 struct dwc3_omap *omap = _omap;
266
267 if (dwc3_omap_read_irqmisc_status(omap) ||
268 dwc3_omap_read_irq0_status(omap)) {
269
270 dwc3_omap_disable_irqs(omap);
271 return IRQ_WAKE_THREAD;
272 }
273
274 return IRQ_NONE;
275}
276
277static irqreturn_t dwc3_omap_interrupt_thread(int irq, void *_omap)
278{
279 struct dwc3_omap *omap = _omap;
280 u32 reg;
281
282
283 reg = dwc3_omap_read_irqmisc_status(omap);
284 dwc3_omap_write_irqmisc_status(omap, reg);
285
286 reg = dwc3_omap_read_irq0_status(omap);
287 dwc3_omap_write_irq0_status(omap, reg);
288
289
290 dwc3_omap_enable_irqs(omap);
291
292 return IRQ_HANDLED;
293}
294
295static void dwc3_omap_enable_irqs(struct dwc3_omap *omap)
296{
297 u32 reg;
298
299
300 reg = USBOTGSS_IRQO_COREIRQ_ST;
301 dwc3_omap_write_irq0_set(omap, reg);
302
303 reg = (USBOTGSS_IRQMISC_OEVT |
304 USBOTGSS_IRQMISC_DRVVBUS_RISE |
305 USBOTGSS_IRQMISC_CHRGVBUS_RISE |
306 USBOTGSS_IRQMISC_DISCHRGVBUS_RISE |
307 USBOTGSS_IRQMISC_IDPULLUP_RISE |
308 USBOTGSS_IRQMISC_DRVVBUS_FALL |
309 USBOTGSS_IRQMISC_CHRGVBUS_FALL |
310 USBOTGSS_IRQMISC_DISCHRGVBUS_FALL |
311 USBOTGSS_IRQMISC_IDPULLUP_FALL);
312
313 dwc3_omap_write_irqmisc_set(omap, reg);
314}
315
316static void dwc3_omap_disable_irqs(struct dwc3_omap *omap)
317{
318 u32 reg;
319
320
321 reg = USBOTGSS_IRQO_COREIRQ_ST;
322 dwc3_omap_write_irq0_clr(omap, reg);
323
324 reg = (USBOTGSS_IRQMISC_OEVT |
325 USBOTGSS_IRQMISC_DRVVBUS_RISE |
326 USBOTGSS_IRQMISC_CHRGVBUS_RISE |
327 USBOTGSS_IRQMISC_DISCHRGVBUS_RISE |
328 USBOTGSS_IRQMISC_IDPULLUP_RISE |
329 USBOTGSS_IRQMISC_DRVVBUS_FALL |
330 USBOTGSS_IRQMISC_CHRGVBUS_FALL |
331 USBOTGSS_IRQMISC_DISCHRGVBUS_FALL |
332 USBOTGSS_IRQMISC_IDPULLUP_FALL);
333
334 dwc3_omap_write_irqmisc_clr(omap, reg);
335}
336
337static int dwc3_omap_id_notifier(struct notifier_block *nb,
338 unsigned long event, void *ptr)
339{
340 struct dwc3_omap *omap = container_of(nb, struct dwc3_omap, id_nb);
341
342 if (event)
343 dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_GROUND);
344 else
345 dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_FLOAT);
346
347 return NOTIFY_DONE;
348}
349
350static int dwc3_omap_vbus_notifier(struct notifier_block *nb,
351 unsigned long event, void *ptr)
352{
353 struct dwc3_omap *omap = container_of(nb, struct dwc3_omap, vbus_nb);
354
355 if (event)
356 dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_VALID);
357 else
358 dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_OFF);
359
360 return NOTIFY_DONE;
361}
362
363static void dwc3_omap_map_offset(struct dwc3_omap *omap)
364{
365 struct device_node *node = omap->dev->of_node;
366
367
368
369
370
371
372
373
374
375 if (of_device_is_compatible(node, "ti,am437x-dwc3")) {
376 omap->irq_eoi_offset = USBOTGSS_EOI_OFFSET;
377 omap->irq0_offset = USBOTGSS_IRQ0_OFFSET;
378 omap->irqmisc_offset = USBOTGSS_IRQMISC_OFFSET;
379 omap->utmi_otg_offset = USBOTGSS_UTMI_OTG_OFFSET;
380 omap->debug_offset = USBOTGSS_DEBUG_OFFSET;
381 }
382}
383
384static void dwc3_omap_set_utmi_mode(struct dwc3_omap *omap)
385{
386 u32 reg;
387 struct device_node *node = omap->dev->of_node;
388 u32 utmi_mode = 0;
389
390 reg = dwc3_omap_read_utmi_ctrl(omap);
391
392 of_property_read_u32(node, "utmi-mode", &utmi_mode);
393
394 switch (utmi_mode) {
395 case DWC3_OMAP_UTMI_MODE_SW:
396 reg |= USBOTGSS_UTMI_OTG_CTRL_SW_MODE;
397 break;
398 case DWC3_OMAP_UTMI_MODE_HW:
399 reg &= ~USBOTGSS_UTMI_OTG_CTRL_SW_MODE;
400 break;
401 default:
402 dev_WARN(omap->dev, "UNKNOWN utmi mode %d\n", utmi_mode);
403 }
404
405 dwc3_omap_write_utmi_ctrl(omap, reg);
406}
407
408static int dwc3_omap_extcon_register(struct dwc3_omap *omap)
409{
410 int ret;
411 struct device_node *node = omap->dev->of_node;
412 struct extcon_dev *edev;
413
414 if (of_property_read_bool(node, "extcon")) {
415 edev = extcon_get_edev_by_phandle(omap->dev, 0);
416 if (IS_ERR(edev)) {
417 dev_vdbg(omap->dev, "couldn't get extcon device\n");
418 return -EPROBE_DEFER;
419 }
420
421 omap->vbus_nb.notifier_call = dwc3_omap_vbus_notifier;
422 ret = devm_extcon_register_notifier(omap->dev, edev,
423 EXTCON_USB, &omap->vbus_nb);
424 if (ret < 0)
425 dev_vdbg(omap->dev, "failed to register notifier for USB\n");
426
427 omap->id_nb.notifier_call = dwc3_omap_id_notifier;
428 ret = devm_extcon_register_notifier(omap->dev, edev,
429 EXTCON_USB_HOST, &omap->id_nb);
430 if (ret < 0)
431 dev_vdbg(omap->dev, "failed to register notifier for USB-HOST\n");
432
433 if (extcon_get_state(edev, EXTCON_USB) == true)
434 dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_VALID);
435 if (extcon_get_state(edev, EXTCON_USB_HOST) == true)
436 dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_GROUND);
437
438 omap->edev = edev;
439 }
440
441 return 0;
442}
443
444static int dwc3_omap_probe(struct platform_device *pdev)
445{
446 struct device_node *node = pdev->dev.of_node;
447
448 struct dwc3_omap *omap;
449 struct resource *res;
450 struct device *dev = &pdev->dev;
451 struct regulator *vbus_reg = NULL;
452
453 int ret;
454 int irq;
455
456 u32 reg;
457
458 void __iomem *base;
459
460 if (!node) {
461 dev_err(dev, "device node not found\n");
462 return -EINVAL;
463 }
464
465 omap = devm_kzalloc(dev, sizeof(*omap), GFP_KERNEL);
466 if (!omap)
467 return -ENOMEM;
468
469 platform_set_drvdata(pdev, omap);
470
471 irq = platform_get_irq(pdev, 0);
472 if (irq < 0) {
473 dev_err(dev, "missing IRQ resource: %d\n", irq);
474 return irq;
475 }
476
477 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
478 base = devm_ioremap_resource(dev, res);
479 if (IS_ERR(base))
480 return PTR_ERR(base);
481
482 if (of_property_read_bool(node, "vbus-supply")) {
483 vbus_reg = devm_regulator_get(dev, "vbus");
484 if (IS_ERR(vbus_reg)) {
485 dev_err(dev, "vbus init failed\n");
486 return PTR_ERR(vbus_reg);
487 }
488 }
489
490 omap->dev = dev;
491 omap->irq = irq;
492 omap->base = base;
493 omap->vbus_reg = vbus_reg;
494
495 pm_runtime_enable(dev);
496 ret = pm_runtime_get_sync(dev);
497 if (ret < 0) {
498 dev_err(dev, "get_sync failed with err %d\n", ret);
499 goto err1;
500 }
501
502 dwc3_omap_map_offset(omap);
503 dwc3_omap_set_utmi_mode(omap);
504
505
506 reg = dwc3_omap_readl(omap->base, USBOTGSS_SYSCONFIG);
507
508 ret = dwc3_omap_extcon_register(omap);
509 if (ret < 0)
510 goto err1;
511
512 ret = of_platform_populate(node, NULL, NULL, dev);
513 if (ret) {
514 dev_err(&pdev->dev, "failed to create dwc3 core\n");
515 goto err1;
516 }
517
518 ret = devm_request_threaded_irq(dev, omap->irq, dwc3_omap_interrupt,
519 dwc3_omap_interrupt_thread, IRQF_SHARED,
520 "dwc3-omap", omap);
521 if (ret) {
522 dev_err(dev, "failed to request IRQ #%d --> %d\n",
523 omap->irq, ret);
524 goto err1;
525 }
526 dwc3_omap_enable_irqs(omap);
527 return 0;
528
529err1:
530 pm_runtime_put_sync(dev);
531 pm_runtime_disable(dev);
532
533 return ret;
534}
535
536static int dwc3_omap_remove(struct platform_device *pdev)
537{
538 struct dwc3_omap *omap = platform_get_drvdata(pdev);
539
540 dwc3_omap_disable_irqs(omap);
541 disable_irq(omap->irq);
542 of_platform_depopulate(omap->dev);
543 pm_runtime_put_sync(&pdev->dev);
544 pm_runtime_disable(&pdev->dev);
545
546 return 0;
547}
548
549static const struct of_device_id of_dwc3_match[] = {
550 {
551 .compatible = "ti,dwc3"
552 },
553 {
554 .compatible = "ti,am437x-dwc3"
555 },
556 { },
557};
558MODULE_DEVICE_TABLE(of, of_dwc3_match);
559
560#ifdef CONFIG_PM_SLEEP
561static int dwc3_omap_suspend(struct device *dev)
562{
563 struct dwc3_omap *omap = dev_get_drvdata(dev);
564
565 omap->utmi_otg_ctrl = dwc3_omap_read_utmi_ctrl(omap);
566 dwc3_omap_disable_irqs(omap);
567
568 return 0;
569}
570
571static int dwc3_omap_resume(struct device *dev)
572{
573 struct dwc3_omap *omap = dev_get_drvdata(dev);
574
575 dwc3_omap_write_utmi_ctrl(omap, omap->utmi_otg_ctrl);
576 dwc3_omap_enable_irqs(omap);
577
578 pm_runtime_disable(dev);
579 pm_runtime_set_active(dev);
580 pm_runtime_enable(dev);
581
582 return 0;
583}
584
585static void dwc3_omap_complete(struct device *dev)
586{
587 struct dwc3_omap *omap = dev_get_drvdata(dev);
588
589 if (extcon_get_state(omap->edev, EXTCON_USB))
590 dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_VALID);
591 else
592 dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_OFF);
593
594 if (extcon_get_state(omap->edev, EXTCON_USB_HOST))
595 dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_GROUND);
596 else
597 dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_FLOAT);
598}
599
600static const struct dev_pm_ops dwc3_omap_dev_pm_ops = {
601
602 SET_SYSTEM_SLEEP_PM_OPS(dwc3_omap_suspend, dwc3_omap_resume)
603 .complete = dwc3_omap_complete,
604};
605
606#define DEV_PM_OPS (&dwc3_omap_dev_pm_ops)
607#else
608#define DEV_PM_OPS NULL
609#endif
610
611static struct platform_driver dwc3_omap_driver = {
612 .probe = dwc3_omap_probe,
613 .remove = dwc3_omap_remove,
614 .driver = {
615 .name = "omap-dwc3",
616 .of_match_table = of_dwc3_match,
617 .pm = DEV_PM_OPS,
618 },
619};
620
621module_platform_driver(dwc3_omap_driver);
622
623MODULE_ALIAS("platform:omap-dwc3");
624MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
625MODULE_LICENSE("GPL v2");
626MODULE_DESCRIPTION("DesignWare USB3 OMAP Glue Layer");
627
