1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Renesas R-Car Gen3 for USB2.0 PHY driver
4 *
5 * Copyright (C) 2015-2017 Renesas Electronics Corporation
6 *
7 * This is based on the phy-rcar-gen2 driver:
8 * Copyright (C) 2014 Renesas Solutions Corp.
9 * Copyright (C) 2014 Cogent Embedded, Inc.
10 */
11
12 #include <linux/extcon-provider.h>
13 #include <linux/interrupt.h>
14 #include <linux/io.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/of.h>
18 #include <linux/phy/phy.h>
19 #include <linux/platform_device.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/regulator/consumer.h>
22 #include <linux/string.h>
23 #include <linux/usb/of.h>
24 #include <linux/workqueue.h>
25
26 /******* USB2.0 Host registers (original offset is +0x200) *******/
27 #define USB2_INT_ENABLE 0x000
28 #define USB2_USBCTR 0x00c
29 #define USB2_SPD_RSM_TIMSET 0x10c
30 #define USB2_OC_TIMSET 0x110
31 #define USB2_COMMCTRL 0x600
32 #define USB2_OBINTSTA 0x604
33 #define USB2_OBINTEN 0x608
34 #define USB2_VBCTRL 0x60c
35 #define USB2_LINECTRL1 0x610
36 #define USB2_ADPCTRL 0x630
37
38 /* INT_ENABLE */
39 #define USB2_INT_ENABLE_UCOM_INTEN BIT(3)
40 #define USB2_INT_ENABLE_USBH_INTB_EN BIT(2) /* For EHCI */
41 #define USB2_INT_ENABLE_USBH_INTA_EN BIT(1) /* For OHCI */
42
43 /* USBCTR */
44 #define USB2_USBCTR_DIRPD BIT(2)
45 #define USB2_USBCTR_PLL_RST BIT(1)
46
47 /* SPD_RSM_TIMSET */
48 #define USB2_SPD_RSM_TIMSET_INIT 0x014e029b
49
50 /* OC_TIMSET */
51 #define USB2_OC_TIMSET_INIT 0x000209ab
52
53 /* COMMCTRL */
54 #define USB2_COMMCTRL_OTG_PERI BIT(31) /* 1 = Peripheral mode */
55
56 /* OBINTSTA and OBINTEN */
57 #define USB2_OBINT_SESSVLDCHG BIT(12)
58 #define USB2_OBINT_IDDIGCHG BIT(11)
59 #define USB2_OBINT_BITS (USB2_OBINT_SESSVLDCHG | \
60 USB2_OBINT_IDDIGCHG)
61
62 /* VBCTRL */
63 #define USB2_VBCTRL_OCCLREN BIT(16)
64 #define USB2_VBCTRL_DRVVBUSSEL BIT(8)
65 #define USB2_VBCTRL_VBOUT BIT(0)
66
67 /* LINECTRL1 */
68 #define USB2_LINECTRL1_DPRPD_EN BIT(19)
69 #define USB2_LINECTRL1_DP_RPD BIT(18)
70 #define USB2_LINECTRL1_DMRPD_EN BIT(17)
71 #define USB2_LINECTRL1_DM_RPD BIT(16)
72 #define USB2_LINECTRL1_OPMODE_NODRV BIT(6)
73
74 /* ADPCTRL */
75 #define USB2_ADPCTRL_OTGSESSVLD BIT(20)
76 #define USB2_ADPCTRL_IDDIG BIT(19)
77 #define USB2_ADPCTRL_IDPULLUP BIT(5) /* 1 = ID sampling is enabled */
78 #define USB2_ADPCTRL_DRVVBUS BIT(4)
79
80 /* RZ/G2L specific */
81 #define USB2_OBINT_IDCHG_EN BIT(0)
82 #define USB2_LINECTRL1_USB2_IDMON BIT(0)
83
84 #define NUM_OF_PHYS 4
85 enum rcar_gen3_phy_index {
86 PHY_INDEX_BOTH_HC,
87 PHY_INDEX_OHCI,
88 PHY_INDEX_EHCI,
89 PHY_INDEX_HSUSB
90 };
91
92 static const u32 rcar_gen3_int_enable[NUM_OF_PHYS] = {
93 USB2_INT_ENABLE_USBH_INTB_EN | USB2_INT_ENABLE_USBH_INTA_EN,
94 USB2_INT_ENABLE_USBH_INTA_EN,
95 USB2_INT_ENABLE_USBH_INTB_EN,
96 0
97 };
98
99 struct rcar_gen3_phy {
100 struct phy *phy;
101 struct rcar_gen3_chan *ch;
102 u32 int_enable_bits;
103 bool initialized;
104 bool otg_initialized;
105 bool powered;
106 };
107
108 struct rcar_gen3_chan {
109 void __iomem *base;
110 struct device *dev; /* platform_device's device */
111 struct extcon_dev *extcon;
112 struct rcar_gen3_phy rphys[NUM_OF_PHYS];
113 struct regulator *vbus;
114 struct work_struct work;
115 struct mutex lock; /* protects rphys[...].powered */
116 enum usb_dr_mode dr_mode;
117 int irq;
118 u32 obint_enable_bits;
119 bool extcon_host;
120 bool is_otg_channel;
121 bool uses_otg_pins;
122 bool soc_no_adp_ctrl;
123 };
124
125 struct rcar_gen3_phy_drv_data {
126 const struct phy_ops *phy_usb2_ops;
127 bool no_adp_ctrl;
128 };
129
130 /*
131 * Combination about is_otg_channel and uses_otg_pins:
132 *
133 * Parameters || Behaviors
134 * is_otg_channel | uses_otg_pins || irqs | role sysfs
135 * ---------------------+---------------++--------------+------------
136 * true | true || enabled | enabled
137 * true | false || disabled | enabled
138 * false | any || disabled | disabled
139 */
140
rcar_gen3_phy_usb2_work(struct work_struct * work)141 static void rcar_gen3_phy_usb2_work(struct work_struct *work)
142 {
143 struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
144 work);
145
146 if (ch->extcon_host) {
147 extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, true);
148 extcon_set_state_sync(ch->extcon, EXTCON_USB, false);
149 } else {
150 extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, false);
151 extcon_set_state_sync(ch->extcon, EXTCON_USB, true);
152 }
153 }
154
rcar_gen3_set_host_mode(struct rcar_gen3_chan * ch,int host)155 static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
156 {
157 void __iomem *usb2_base = ch->base;
158 u32 val = readl(usb2_base + USB2_COMMCTRL);
159
160 dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, host);
161 if (host)
162 val &= ~USB2_COMMCTRL_OTG_PERI;
163 else
164 val |= USB2_COMMCTRL_OTG_PERI;
165 writel(val, usb2_base + USB2_COMMCTRL);
166 }
167
rcar_gen3_set_linectrl(struct rcar_gen3_chan * ch,int dp,int dm)168 static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
169 {
170 void __iomem *usb2_base = ch->base;
171 u32 val = readl(usb2_base + USB2_LINECTRL1);
172
173 dev_vdbg(ch->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
174 val &= ~(USB2_LINECTRL1_DP_RPD | USB2_LINECTRL1_DM_RPD);
175 if (dp)
176 val |= USB2_LINECTRL1_DP_RPD;
177 if (dm)
178 val |= USB2_LINECTRL1_DM_RPD;
179 writel(val, usb2_base + USB2_LINECTRL1);
180 }
181
rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan * ch,int vbus)182 static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
183 {
184 void __iomem *usb2_base = ch->base;
185 u32 vbus_ctrl_reg = USB2_ADPCTRL;
186 u32 vbus_ctrl_val = USB2_ADPCTRL_DRVVBUS;
187 u32 val;
188
189 dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, vbus);
190 if (ch->soc_no_adp_ctrl) {
191 vbus_ctrl_reg = USB2_VBCTRL;
192 vbus_ctrl_val = USB2_VBCTRL_VBOUT;
193 }
194
195 val = readl(usb2_base + vbus_ctrl_reg);
196 if (vbus)
197 val |= vbus_ctrl_val;
198 else
199 val &= ~vbus_ctrl_val;
200 writel(val, usb2_base + vbus_ctrl_reg);
201 }
202
rcar_gen3_control_otg_irq(struct rcar_gen3_chan * ch,int enable)203 static void rcar_gen3_control_otg_irq(struct rcar_gen3_chan *ch, int enable)
204 {
205 void __iomem *usb2_base = ch->base;
206 u32 val = readl(usb2_base + USB2_OBINTEN);
207
208 if (ch->uses_otg_pins && enable)
209 val |= ch->obint_enable_bits;
210 else
211 val &= ~ch->obint_enable_bits;
212 writel(val, usb2_base + USB2_OBINTEN);
213 }
214
rcar_gen3_init_for_host(struct rcar_gen3_chan * ch)215 static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
216 {
217 rcar_gen3_set_linectrl(ch, 1, 1);
218 rcar_gen3_set_host_mode(ch, 1);
219 rcar_gen3_enable_vbus_ctrl(ch, 1);
220
221 ch->extcon_host = true;
222 schedule_work(&ch->work);
223 }
224
rcar_gen3_init_for_peri(struct rcar_gen3_chan * ch)225 static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
226 {
227 rcar_gen3_set_linectrl(ch, 0, 1);
228 rcar_gen3_set_host_mode(ch, 0);
229 rcar_gen3_enable_vbus_ctrl(ch, 0);
230
231 ch->extcon_host = false;
232 schedule_work(&ch->work);
233 }
234
rcar_gen3_init_for_b_host(struct rcar_gen3_chan * ch)235 static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch)
236 {
237 void __iomem *usb2_base = ch->base;
238 u32 val;
239
240 val = readl(usb2_base + USB2_LINECTRL1);
241 writel(val | USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
242
243 rcar_gen3_set_linectrl(ch, 1, 1);
244 rcar_gen3_set_host_mode(ch, 1);
245 rcar_gen3_enable_vbus_ctrl(ch, 0);
246
247 val = readl(usb2_base + USB2_LINECTRL1);
248 writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
249 }
250
rcar_gen3_init_for_a_peri(struct rcar_gen3_chan * ch)251 static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch)
252 {
253 rcar_gen3_set_linectrl(ch, 0, 1);
254 rcar_gen3_set_host_mode(ch, 0);
255 rcar_gen3_enable_vbus_ctrl(ch, 1);
256 }
257
rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan * ch)258 static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
259 {
260 rcar_gen3_control_otg_irq(ch, 0);
261
262 rcar_gen3_enable_vbus_ctrl(ch, 1);
263 rcar_gen3_init_for_host(ch);
264
265 rcar_gen3_control_otg_irq(ch, 1);
266 }
267
rcar_gen3_check_id(struct rcar_gen3_chan * ch)268 static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
269 {
270 if (!ch->uses_otg_pins)
271 return (ch->dr_mode == USB_DR_MODE_HOST) ? false : true;
272
273 if (ch->soc_no_adp_ctrl)
274 return !!(readl(ch->base + USB2_LINECTRL1) & USB2_LINECTRL1_USB2_IDMON);
275
276 return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
277 }
278
rcar_gen3_device_recognition(struct rcar_gen3_chan * ch)279 static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
280 {
281 if (!rcar_gen3_check_id(ch))
282 rcar_gen3_init_for_host(ch);
283 else
284 rcar_gen3_init_for_peri(ch);
285 }
286
rcar_gen3_is_host(struct rcar_gen3_chan * ch)287 static bool rcar_gen3_is_host(struct rcar_gen3_chan *ch)
288 {
289 return !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI);
290 }
291
rcar_gen3_get_phy_mode(struct rcar_gen3_chan * ch)292 static enum phy_mode rcar_gen3_get_phy_mode(struct rcar_gen3_chan *ch)
293 {
294 if (rcar_gen3_is_host(ch))
295 return PHY_MODE_USB_HOST;
296
297 return PHY_MODE_USB_DEVICE;
298 }
299
rcar_gen3_is_any_rphy_initialized(struct rcar_gen3_chan * ch)300 static bool rcar_gen3_is_any_rphy_initialized(struct rcar_gen3_chan *ch)
301 {
302 int i;
303
304 for (i = 0; i < NUM_OF_PHYS; i++) {
305 if (ch->rphys[i].initialized)
306 return true;
307 }
308
309 return false;
310 }
311
rcar_gen3_needs_init_otg(struct rcar_gen3_chan * ch)312 static bool rcar_gen3_needs_init_otg(struct rcar_gen3_chan *ch)
313 {
314 int i;
315
316 for (i = 0; i < NUM_OF_PHYS; i++) {
317 if (ch->rphys[i].otg_initialized)
318 return false;
319 }
320
321 return true;
322 }
323
rcar_gen3_are_all_rphys_power_off(struct rcar_gen3_chan * ch)324 static bool rcar_gen3_are_all_rphys_power_off(struct rcar_gen3_chan *ch)
325 {
326 int i;
327
328 for (i = 0; i < NUM_OF_PHYS; i++) {
329 if (ch->rphys[i].powered)
330 return false;
331 }
332
333 return true;
334 }
335
role_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)336 static ssize_t role_store(struct device *dev, struct device_attribute *attr,
337 const char *buf, size_t count)
338 {
339 struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
340 bool is_b_device;
341 enum phy_mode cur_mode, new_mode;
342
343 if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
344 return -EIO;
345
346 if (sysfs_streq(buf, "host"))
347 new_mode = PHY_MODE_USB_HOST;
348 else if (sysfs_streq(buf, "peripheral"))
349 new_mode = PHY_MODE_USB_DEVICE;
350 else
351 return -EINVAL;
352
353 /* is_b_device: true is B-Device. false is A-Device. */
354 is_b_device = rcar_gen3_check_id(ch);
355 cur_mode = rcar_gen3_get_phy_mode(ch);
356
357 /* If current and new mode is the same, this returns the error */
358 if (cur_mode == new_mode)
359 return -EINVAL;
360
361 if (new_mode == PHY_MODE_USB_HOST) { /* And is_host must be false */
362 if (!is_b_device) /* A-Peripheral */
363 rcar_gen3_init_from_a_peri_to_a_host(ch);
364 else /* B-Peripheral */
365 rcar_gen3_init_for_b_host(ch);
366 } else { /* And is_host must be true */
367 if (!is_b_device) /* A-Host */
368 rcar_gen3_init_for_a_peri(ch);
369 else /* B-Host */
370 rcar_gen3_init_for_peri(ch);
371 }
372
373 return count;
374 }
375
role_show(struct device * dev,struct device_attribute * attr,char * buf)376 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
377 char *buf)
378 {
379 struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
380
381 if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
382 return -EIO;
383
384 return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
385 "peripheral");
386 }
387 static DEVICE_ATTR_RW(role);
388
rcar_gen3_init_otg(struct rcar_gen3_chan * ch)389 static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
390 {
391 void __iomem *usb2_base = ch->base;
392 u32 val;
393
394 /* Should not use functions of read-modify-write a register */
395 val = readl(usb2_base + USB2_LINECTRL1);
396 val = (val & ~USB2_LINECTRL1_DP_RPD) | USB2_LINECTRL1_DPRPD_EN |
397 USB2_LINECTRL1_DMRPD_EN | USB2_LINECTRL1_DM_RPD;
398 writel(val, usb2_base + USB2_LINECTRL1);
399
400 if (!ch->soc_no_adp_ctrl) {
401 val = readl(usb2_base + USB2_VBCTRL);
402 val &= ~USB2_VBCTRL_OCCLREN;
403 writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
404 val = readl(usb2_base + USB2_ADPCTRL);
405 writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
406 }
407 msleep(20);
408
409 writel(0xffffffff, usb2_base + USB2_OBINTSTA);
410 writel(ch->obint_enable_bits, usb2_base + USB2_OBINTEN);
411
412 rcar_gen3_device_recognition(ch);
413 }
414
rcar_gen3_phy_usb2_irq(int irq,void * _ch)415 static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
416 {
417 struct rcar_gen3_chan *ch = _ch;
418 void __iomem *usb2_base = ch->base;
419 u32 status = readl(usb2_base + USB2_OBINTSTA);
420 irqreturn_t ret = IRQ_NONE;
421
422 if (status & ch->obint_enable_bits) {
423 dev_vdbg(ch->dev, "%s: %08x\n", __func__, status);
424 writel(ch->obint_enable_bits, usb2_base + USB2_OBINTSTA);
425 rcar_gen3_device_recognition(ch);
426 ret = IRQ_HANDLED;
427 }
428
429 return ret;
430 }
431
rcar_gen3_phy_usb2_init(struct phy * p)432 static int rcar_gen3_phy_usb2_init(struct phy *p)
433 {
434 struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
435 struct rcar_gen3_chan *channel = rphy->ch;
436 void __iomem *usb2_base = channel->base;
437 u32 val;
438 int ret;
439
440 if (!rcar_gen3_is_any_rphy_initialized(channel) && channel->irq >= 0) {
441 INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
442 ret = request_irq(channel->irq, rcar_gen3_phy_usb2_irq,
443 IRQF_SHARED, dev_name(channel->dev), channel);
444 if (ret < 0) {
445 dev_err(channel->dev, "No irq handler (%d)\n", channel->irq);
446 return ret;
447 }
448 }
449
450 /* Initialize USB2 part */
451 val = readl(usb2_base + USB2_INT_ENABLE);
452 val |= USB2_INT_ENABLE_UCOM_INTEN | rphy->int_enable_bits;
453 writel(val, usb2_base + USB2_INT_ENABLE);
454 writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
455 writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
456
457 /* Initialize otg part */
458 if (channel->is_otg_channel) {
459 if (rcar_gen3_needs_init_otg(channel))
460 rcar_gen3_init_otg(channel);
461 rphy->otg_initialized = true;
462 }
463
464 rphy->initialized = true;
465
466 return 0;
467 }
468
rcar_gen3_phy_usb2_exit(struct phy * p)469 static int rcar_gen3_phy_usb2_exit(struct phy *p)
470 {
471 struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
472 struct rcar_gen3_chan *channel = rphy->ch;
473 void __iomem *usb2_base = channel->base;
474 u32 val;
475
476 rphy->initialized = false;
477
478 if (channel->is_otg_channel)
479 rphy->otg_initialized = false;
480
481 val = readl(usb2_base + USB2_INT_ENABLE);
482 val &= ~rphy->int_enable_bits;
483 if (!rcar_gen3_is_any_rphy_initialized(channel))
484 val &= ~USB2_INT_ENABLE_UCOM_INTEN;
485 writel(val, usb2_base + USB2_INT_ENABLE);
486
487 if (channel->irq >= 0 && !rcar_gen3_is_any_rphy_initialized(channel))
488 free_irq(channel->irq, channel);
489
490 return 0;
491 }
492
rcar_gen3_phy_usb2_power_on(struct phy * p)493 static int rcar_gen3_phy_usb2_power_on(struct phy *p)
494 {
495 struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
496 struct rcar_gen3_chan *channel = rphy->ch;
497 void __iomem *usb2_base = channel->base;
498 u32 val;
499 int ret = 0;
500
501 mutex_lock(&channel->lock);
502 if (!rcar_gen3_are_all_rphys_power_off(channel))
503 goto out;
504
505 if (channel->vbus) {
506 ret = regulator_enable(channel->vbus);
507 if (ret)
508 goto out;
509 }
510
511 val = readl(usb2_base + USB2_USBCTR);
512 val |= USB2_USBCTR_PLL_RST;
513 writel(val, usb2_base + USB2_USBCTR);
514 val &= ~USB2_USBCTR_PLL_RST;
515 writel(val, usb2_base + USB2_USBCTR);
516
517 out:
518 /* The powered flag should be set for any other phys anyway */
519 rphy->powered = true;
520 mutex_unlock(&channel->lock);
521
522 return 0;
523 }
524
rcar_gen3_phy_usb2_power_off(struct phy * p)525 static int rcar_gen3_phy_usb2_power_off(struct phy *p)
526 {
527 struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
528 struct rcar_gen3_chan *channel = rphy->ch;
529 int ret = 0;
530
531 mutex_lock(&channel->lock);
532 rphy->powered = false;
533
534 if (!rcar_gen3_are_all_rphys_power_off(channel))
535 goto out;
536
537 if (channel->vbus)
538 ret = regulator_disable(channel->vbus);
539
540 out:
541 mutex_unlock(&channel->lock);
542
543 return ret;
544 }
545
546 static const struct phy_ops rcar_gen3_phy_usb2_ops = {
547 .init = rcar_gen3_phy_usb2_init,
548 .exit = rcar_gen3_phy_usb2_exit,
549 .power_on = rcar_gen3_phy_usb2_power_on,
550 .power_off = rcar_gen3_phy_usb2_power_off,
551 .owner = THIS_MODULE,
552 };
553
554 static const struct phy_ops rz_g1c_phy_usb2_ops = {
555 .init = rcar_gen3_phy_usb2_init,
556 .exit = rcar_gen3_phy_usb2_exit,
557 .owner = THIS_MODULE,
558 };
559
560 static const struct rcar_gen3_phy_drv_data rcar_gen3_phy_usb2_data = {
561 .phy_usb2_ops = &rcar_gen3_phy_usb2_ops,
562 .no_adp_ctrl = false,
563 };
564
565 static const struct rcar_gen3_phy_drv_data rz_g1c_phy_usb2_data = {
566 .phy_usb2_ops = &rz_g1c_phy_usb2_ops,
567 .no_adp_ctrl = false,
568 };
569
570 static const struct rcar_gen3_phy_drv_data rz_g2l_phy_usb2_data = {
571 .phy_usb2_ops = &rcar_gen3_phy_usb2_ops,
572 .no_adp_ctrl = true,
573 };
574
575 static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
576 {
577 .compatible = "renesas,usb2-phy-r8a77470",
578 .data = &rz_g1c_phy_usb2_data,
579 },
580 {
581 .compatible = "renesas,usb2-phy-r8a7795",
582 .data = &rcar_gen3_phy_usb2_data,
583 },
584 {
585 .compatible = "renesas,usb2-phy-r8a7796",
586 .data = &rcar_gen3_phy_usb2_data,
587 },
588 {
589 .compatible = "renesas,usb2-phy-r8a77965",
590 .data = &rcar_gen3_phy_usb2_data,
591 },
592 {
593 .compatible = "renesas,rzg2l-usb2-phy",
594 .data = &rz_g2l_phy_usb2_data,
595 },
596 {
597 .compatible = "renesas,rcar-gen3-usb2-phy",
598 .data = &rcar_gen3_phy_usb2_data,
599 },
600 { /* sentinel */ },
601 };
602 MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);
603
604 static const unsigned int rcar_gen3_phy_cable[] = {
605 EXTCON_USB,
606 EXTCON_USB_HOST,
607 EXTCON_NONE,
608 };
609
rcar_gen3_phy_usb2_xlate(struct device * dev,struct of_phandle_args * args)610 static struct phy *rcar_gen3_phy_usb2_xlate(struct device *dev,
611 struct of_phandle_args *args)
612 {
613 struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
614
615 if (args->args_count == 0) /* For old version dts */
616 return ch->rphys[PHY_INDEX_BOTH_HC].phy;
617 else if (args->args_count > 1) /* Prevent invalid args count */
618 return ERR_PTR(-ENODEV);
619
620 if (args->args[0] >= NUM_OF_PHYS)
621 return ERR_PTR(-ENODEV);
622
623 return ch->rphys[args->args[0]].phy;
624 }
625
rcar_gen3_get_dr_mode(struct device_node * np)626 static enum usb_dr_mode rcar_gen3_get_dr_mode(struct device_node *np)
627 {
628 enum usb_dr_mode candidate = USB_DR_MODE_UNKNOWN;
629 int i;
630
631 /*
632 * If one of device nodes has other dr_mode except UNKNOWN,
633 * this function returns UNKNOWN. To achieve backward compatibility,
634 * this loop starts the index as 0.
635 */
636 for (i = 0; i < NUM_OF_PHYS; i++) {
637 enum usb_dr_mode mode = of_usb_get_dr_mode_by_phy(np, i);
638
639 if (mode != USB_DR_MODE_UNKNOWN) {
640 if (candidate == USB_DR_MODE_UNKNOWN)
641 candidate = mode;
642 else if (candidate != mode)
643 return USB_DR_MODE_UNKNOWN;
644 }
645 }
646
647 return candidate;
648 }
649
rcar_gen3_phy_usb2_probe(struct platform_device * pdev)650 static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
651 {
652 const struct rcar_gen3_phy_drv_data *phy_data;
653 struct device *dev = &pdev->dev;
654 struct rcar_gen3_chan *channel;
655 struct phy_provider *provider;
656 int ret = 0, i;
657
658 if (!dev->of_node) {
659 dev_err(dev, "This driver needs device tree\n");
660 return -EINVAL;
661 }
662
663 channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
664 if (!channel)
665 return -ENOMEM;
666
667 channel->base = devm_platform_ioremap_resource(pdev, 0);
668 if (IS_ERR(channel->base))
669 return PTR_ERR(channel->base);
670
671 channel->obint_enable_bits = USB2_OBINT_BITS;
672 /* get irq number here and request_irq for OTG in phy_init */
673 channel->irq = platform_get_irq_optional(pdev, 0);
674 channel->dr_mode = rcar_gen3_get_dr_mode(dev->of_node);
675 if (channel->dr_mode != USB_DR_MODE_UNKNOWN) {
676 channel->is_otg_channel = true;
677 channel->uses_otg_pins = !of_property_read_bool(dev->of_node,
678 "renesas,no-otg-pins");
679 channel->extcon = devm_extcon_dev_allocate(dev,
680 rcar_gen3_phy_cable);
681 if (IS_ERR(channel->extcon))
682 return PTR_ERR(channel->extcon);
683
684 ret = devm_extcon_dev_register(dev, channel->extcon);
685 if (ret < 0) {
686 dev_err(dev, "Failed to register extcon\n");
687 return ret;
688 }
689 }
690
691 /*
692 * devm_phy_create() will call pm_runtime_enable(&phy->dev);
693 * And then, phy-core will manage runtime pm for this device.
694 */
695 pm_runtime_enable(dev);
696
697 phy_data = of_device_get_match_data(dev);
698 if (!phy_data) {
699 ret = -EINVAL;
700 goto error;
701 }
702
703 channel->soc_no_adp_ctrl = phy_data->no_adp_ctrl;
704 if (phy_data->no_adp_ctrl)
705 channel->obint_enable_bits = USB2_OBINT_IDCHG_EN;
706
707 mutex_init(&channel->lock);
708 for (i = 0; i < NUM_OF_PHYS; i++) {
709 channel->rphys[i].phy = devm_phy_create(dev, NULL,
710 phy_data->phy_usb2_ops);
711 if (IS_ERR(channel->rphys[i].phy)) {
712 dev_err(dev, "Failed to create USB2 PHY\n");
713 ret = PTR_ERR(channel->rphys[i].phy);
714 goto error;
715 }
716 channel->rphys[i].ch = channel;
717 channel->rphys[i].int_enable_bits = rcar_gen3_int_enable[i];
718 phy_set_drvdata(channel->rphys[i].phy, &channel->rphys[i]);
719 }
720
721 channel->vbus = devm_regulator_get_optional(dev, "vbus");
722 if (IS_ERR(channel->vbus)) {
723 if (PTR_ERR(channel->vbus) == -EPROBE_DEFER) {
724 ret = PTR_ERR(channel->vbus);
725 goto error;
726 }
727 channel->vbus = NULL;
728 }
729
730 platform_set_drvdata(pdev, channel);
731 channel->dev = dev;
732
733 provider = devm_of_phy_provider_register(dev, rcar_gen3_phy_usb2_xlate);
734 if (IS_ERR(provider)) {
735 dev_err(dev, "Failed to register PHY provider\n");
736 ret = PTR_ERR(provider);
737 goto error;
738 } else if (channel->is_otg_channel) {
739 ret = device_create_file(dev, &dev_attr_role);
740 if (ret < 0)
741 goto error;
742 }
743
744 return 0;
745
746 error:
747 pm_runtime_disable(dev);
748
749 return ret;
750 }
751
rcar_gen3_phy_usb2_remove(struct platform_device * pdev)752 static void rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
753 {
754 struct rcar_gen3_chan *channel = platform_get_drvdata(pdev);
755
756 if (channel->is_otg_channel)
757 device_remove_file(&pdev->dev, &dev_attr_role);
758
759 pm_runtime_disable(&pdev->dev);
760 };
761
762 static struct platform_driver rcar_gen3_phy_usb2_driver = {
763 .driver = {
764 .name = "phy_rcar_gen3_usb2",
765 .of_match_table = rcar_gen3_phy_usb2_match_table,
766 },
767 .probe = rcar_gen3_phy_usb2_probe,
768 .remove_new = rcar_gen3_phy_usb2_remove,
769 };
770 module_platform_driver(rcar_gen3_phy_usb2_driver);
771
772 MODULE_LICENSE("GPL v2");
773 MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
774 MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
775