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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * OHCI HCD (Host Controller Driver) for USB.
4 *
5 * TI DA8xx (OMAP-L1x) Bus Glue
6 *
7 * Derived from: ohci-omap.c and ohci-s3c2410.c
8 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
9 */
10
11#include <linux/clk.h>
12#include <linux/gpio/consumer.h>
13#include <linux/io.h>
14#include <linux/interrupt.h>
15#include <linux/jiffies.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/platform_device.h>
19#include <linux/phy/phy.h>
20#include <linux/platform_data/usb-davinci.h>
21#include <linux/regulator/consumer.h>
22#include <linux/usb.h>
23#include <linux/usb/hcd.h>
24#include <asm/unaligned.h>
25
26#include "ohci.h"
27
28#define DRIVER_DESC "DA8XX"
29#define DRV_NAME "ohci-da8xx"
30
31static struct hc_driver __read_mostly ohci_da8xx_hc_driver;
32
33static int (*orig_ohci_hub_control)(struct usb_hcd *hcd, u16 typeReq,
34 u16 wValue, u16 wIndex, char *buf, u16 wLength);
35static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf);
36
37struct da8xx_ohci_hcd {
38 struct usb_hcd *hcd;
39 struct clk *usb11_clk;
40 struct phy *usb11_phy;
41 struct regulator *vbus_reg;
42 struct notifier_block nb;
43 struct gpio_desc *oc_gpio;
44};
45
46#define to_da8xx_ohci(hcd) (struct da8xx_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
47
48/* Over-current indicator change bitmask */
49static volatile u16 ocic_mask;
50
51static int ohci_da8xx_enable(struct usb_hcd *hcd)
52{
53 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
54 int ret;
55
56 ret = clk_prepare_enable(da8xx_ohci->usb11_clk);
57 if (ret)
58 return ret;
59
60 ret = phy_init(da8xx_ohci->usb11_phy);
61 if (ret)
62 goto err_phy_init;
63
64 ret = phy_power_on(da8xx_ohci->usb11_phy);
65 if (ret)
66 goto err_phy_power_on;
67
68 return 0;
69
70err_phy_power_on:
71 phy_exit(da8xx_ohci->usb11_phy);
72err_phy_init:
73 clk_disable_unprepare(da8xx_ohci->usb11_clk);
74
75 return ret;
76}
77
78static void ohci_da8xx_disable(struct usb_hcd *hcd)
79{
80 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
81
82 phy_power_off(da8xx_ohci->usb11_phy);
83 phy_exit(da8xx_ohci->usb11_phy);
84 clk_disable_unprepare(da8xx_ohci->usb11_clk);
85}
86
87static int ohci_da8xx_set_power(struct usb_hcd *hcd, int on)
88{
89 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
90 struct device *dev = hcd->self.controller;
91 int ret;
92
93 if (!da8xx_ohci->vbus_reg)
94 return 0;
95
96 if (on) {
97 ret = regulator_enable(da8xx_ohci->vbus_reg);
98 if (ret) {
99 dev_err(dev, "Failed to enable regulator: %d\n", ret);
100 return ret;
101 }
102 } else {
103 ret = regulator_disable(da8xx_ohci->vbus_reg);
104 if (ret) {
105 dev_err(dev, "Failed to disable regulator: %d\n", ret);
106 return ret;
107 }
108 }
109
110 return 0;
111}
112
113static int ohci_da8xx_get_power(struct usb_hcd *hcd)
114{
115 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
116
117 if (da8xx_ohci->vbus_reg)
118 return regulator_is_enabled(da8xx_ohci->vbus_reg);
119
120 return 1;
121}
122
123static int ohci_da8xx_get_oci(struct usb_hcd *hcd)
124{
125 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
126 unsigned int flags;
127 int ret;
128
129 if (da8xx_ohci->oc_gpio)
130 return gpiod_get_value_cansleep(da8xx_ohci->oc_gpio);
131
132 if (!da8xx_ohci->vbus_reg)
133 return 0;
134
135 ret = regulator_get_error_flags(da8xx_ohci->vbus_reg, &flags);
136 if (ret)
137 return ret;
138
139 if (flags & REGULATOR_ERROR_OVER_CURRENT)
140 return 1;
141
142 return 0;
143}
144
145static int ohci_da8xx_has_set_power(struct usb_hcd *hcd)
146{
147 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
148
149 if (da8xx_ohci->vbus_reg)
150 return 1;
151
152 return 0;
153}
154
155static int ohci_da8xx_has_oci(struct usb_hcd *hcd)
156{
157 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
158
159 if (da8xx_ohci->oc_gpio)
160 return 1;
161
162 if (da8xx_ohci->vbus_reg)
163 return 1;
164
165 return 0;
166}
167
168static int ohci_da8xx_has_potpgt(struct usb_hcd *hcd)
169{
170 struct device *dev = hcd->self.controller;
171 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
172
173 if (hub && hub->potpgt)
174 return 1;
175
176 return 0;
177}
178
179static int ohci_da8xx_regulator_event(struct notifier_block *nb,
180 unsigned long event, void *data)
181{
182 struct da8xx_ohci_hcd *da8xx_ohci =
183 container_of(nb, struct da8xx_ohci_hcd, nb);
184
185 if (event & REGULATOR_EVENT_OVER_CURRENT) {
186 ocic_mask |= 1 << 1;
187 ohci_da8xx_set_power(da8xx_ohci->hcd, 0);
188 }
189
190 return 0;
191}
192
193static irqreturn_t ohci_da8xx_oc_thread(int irq, void *data)
194{
195 struct da8xx_ohci_hcd *da8xx_ohci = data;
196 struct device *dev = da8xx_ohci->hcd->self.controller;
197 int ret;
198
199 if (gpiod_get_value_cansleep(da8xx_ohci->oc_gpio) &&
200 da8xx_ohci->vbus_reg) {
201 ret = regulator_disable(da8xx_ohci->vbus_reg);
202 if (ret)
203 dev_err(dev, "Failed to disable regulator: %d\n", ret);
204 }
205
206 return IRQ_HANDLED;
207}
208
209static int ohci_da8xx_register_notify(struct usb_hcd *hcd)
210{
211 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
212 struct device *dev = hcd->self.controller;
213 int ret = 0;
214
215 if (!da8xx_ohci->oc_gpio && da8xx_ohci->vbus_reg) {
216 da8xx_ohci->nb.notifier_call = ohci_da8xx_regulator_event;
217 ret = devm_regulator_register_notifier(da8xx_ohci->vbus_reg,
218 &da8xx_ohci->nb);
219 }
220
221 if (ret)
222 dev_err(dev, "Failed to register notifier: %d\n", ret);
223
224 return ret;
225}
226
227static int ohci_da8xx_reset(struct usb_hcd *hcd)
228{
229 struct device *dev = hcd->self.controller;
230 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
231 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
232 int result;
233 u32 rh_a;
234
235 dev_dbg(dev, "starting USB controller\n");
236
237 result = ohci_da8xx_enable(hcd);
238 if (result < 0)
239 return result;
240
241 /*
242 * DA8xx only have 1 port connected to the pins but the HC root hub
243 * register A reports 2 ports, thus we'll have to override it...
244 */
245 ohci->num_ports = 1;
246
247 result = ohci_setup(hcd);
248 if (result < 0) {
249 ohci_da8xx_disable(hcd);
250 return result;
251 }
252
253 /*
254 * Since we're providing a board-specific root hub port power control
255 * and over-current reporting, we have to override the HC root hub A
256 * register's default value, so that ohci_hub_control() could return
257 * the correct hub descriptor...
258 */
259 rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
260 if (ohci_da8xx_has_set_power(hcd)) {
261 rh_a &= ~RH_A_NPS;
262 rh_a |= RH_A_PSM;
263 }
264 if (ohci_da8xx_has_oci(hcd)) {
265 rh_a &= ~RH_A_NOCP;
266 rh_a |= RH_A_OCPM;
267 }
268 if (ohci_da8xx_has_potpgt(hcd)) {
269 rh_a &= ~RH_A_POTPGT;
270 rh_a |= hub->potpgt << 24;
271 }
272 ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
273
274 return result;
275}
276
277/*
278 * Update the status data from the hub with the over-current indicator change.
279 */
280static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf)
281{
282 int length = orig_ohci_hub_status_data(hcd, buf);
283
284 /* See if we have OCIC bit set on port 1 */
285 if (ocic_mask & (1 << 1)) {
286 dev_dbg(hcd->self.controller, "over-current indicator change "
287 "on port 1\n");
288
289 if (!length)
290 length = 1;
291
292 buf[0] |= 1 << 1;
293 }
294 return length;
295}
296
297/*
298 * Look at the control requests to the root hub and see if we need to override.
299 */
300static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
301 u16 wIndex, char *buf, u16 wLength)
302{
303 struct device *dev = hcd->self.controller;
304 int temp;
305
306 switch (typeReq) {
307 case GetPortStatus:
308 /* Check the port number */
309 if (wIndex != 1)
310 break;
311
312 dev_dbg(dev, "GetPortStatus(%u)\n", wIndex);
313
314 temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1);
315
316 /* The port power status (PPS) bit defaults to 1 */
317 if (!ohci_da8xx_get_power(hcd))
318 temp &= ~RH_PS_PPS;
319
320 /* The port over-current indicator (POCI) bit is always 0 */
321 if (ohci_da8xx_get_oci(hcd) > 0)
322 temp |= RH_PS_POCI;
323
324 /* The over-current indicator change (OCIC) bit is 0 too */
325 if (ocic_mask & (1 << wIndex))
326 temp |= RH_PS_OCIC;
327
328 put_unaligned(cpu_to_le32(temp), (__le32 *)buf);
329 return 0;
330 case SetPortFeature:
331 temp = 1;
332 goto check_port;
333 case ClearPortFeature:
334 temp = 0;
335
336check_port:
337 /* Check the port number */
338 if (wIndex != 1)
339 break;
340
341 switch (wValue) {
342 case USB_PORT_FEAT_POWER:
343 dev_dbg(dev, "%sPortFeature(%u): %s\n",
344 temp ? "Set" : "Clear", wIndex, "POWER");
345
346 return ohci_da8xx_set_power(hcd, temp) ? -EPIPE : 0;
347 case USB_PORT_FEAT_C_OVER_CURRENT:
348 dev_dbg(dev, "%sPortFeature(%u): %s\n",
349 temp ? "Set" : "Clear", wIndex,
350 "C_OVER_CURRENT");
351
352 if (temp)
353 ocic_mask |= 1 << wIndex;
354 else
355 ocic_mask &= ~(1 << wIndex);
356 return 0;
357 }
358 }
359
360 return orig_ohci_hub_control(hcd, typeReq, wValue,
361 wIndex, buf, wLength);
362}
363
364/*-------------------------------------------------------------------------*/
365#ifdef CONFIG_OF
366static const struct of_device_id da8xx_ohci_ids[] = {
367 { .compatible = "ti,da830-ohci" },
368 { }
369};
370MODULE_DEVICE_TABLE(of, da8xx_ohci_ids);
371#endif
372
373static int ohci_da8xx_probe(struct platform_device *pdev)
374{
375 struct da8xx_ohci_hcd *da8xx_ohci;
376 struct device *dev = &pdev->dev;
377 int error, hcd_irq, oc_irq;
378 struct usb_hcd *hcd;
379 struct resource *mem;
380
381 hcd = usb_create_hcd(&ohci_da8xx_hc_driver, dev, dev_name(dev));
382 if (!hcd)
383 return -ENOMEM;
384
385 da8xx_ohci = to_da8xx_ohci(hcd);
386 da8xx_ohci->hcd = hcd;
387
388 da8xx_ohci->usb11_clk = devm_clk_get(dev, NULL);
389 if (IS_ERR(da8xx_ohci->usb11_clk)) {
390 error = PTR_ERR(da8xx_ohci->usb11_clk);
391 if (error != -EPROBE_DEFER)
392 dev_err(dev, "Failed to get clock.\n");
393 goto err;
394 }
395
396 da8xx_ohci->usb11_phy = devm_phy_get(dev, "usb-phy");
397 if (IS_ERR(da8xx_ohci->usb11_phy)) {
398 error = PTR_ERR(da8xx_ohci->usb11_phy);
399 if (error != -EPROBE_DEFER)
400 dev_err(dev, "Failed to get phy.\n");
401 goto err;
402 }
403
404 da8xx_ohci->vbus_reg = devm_regulator_get_optional(dev, "vbus");
405 if (IS_ERR(da8xx_ohci->vbus_reg)) {
406 error = PTR_ERR(da8xx_ohci->vbus_reg);
407 if (error == -ENODEV) {
408 da8xx_ohci->vbus_reg = NULL;
409 } else if (error == -EPROBE_DEFER) {
410 goto err;
411 } else {
412 dev_err(dev, "Failed to get regulator\n");
413 goto err;
414 }
415 }
416
417 da8xx_ohci->oc_gpio = devm_gpiod_get_optional(dev, "oc", GPIOD_IN);
418 if (IS_ERR(da8xx_ohci->oc_gpio)) {
419 error = PTR_ERR(da8xx_ohci->oc_gpio);
420 goto err;
421 }
422
423 if (da8xx_ohci->oc_gpio) {
424 oc_irq = gpiod_to_irq(da8xx_ohci->oc_gpio);
425 if (oc_irq < 0) {
426 error = oc_irq;
427 goto err;
428 }
429
430 error = devm_request_threaded_irq(dev, oc_irq, NULL,
431 ohci_da8xx_oc_thread, IRQF_TRIGGER_RISING |
432 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
433 "OHCI over-current indicator", da8xx_ohci);
434 if (error)
435 goto err;
436 }
437
438 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
439 hcd->regs = devm_ioremap_resource(dev, mem);
440 if (IS_ERR(hcd->regs)) {
441 error = PTR_ERR(hcd->regs);
442 goto err;
443 }
444 hcd->rsrc_start = mem->start;
445 hcd->rsrc_len = resource_size(mem);
446
447 hcd_irq = platform_get_irq(pdev, 0);
448 if (hcd_irq < 0) {
449 error = -ENODEV;
450 goto err;
451 }
452
453 error = usb_add_hcd(hcd, hcd_irq, 0);
454 if (error)
455 goto err;
456
457 device_wakeup_enable(hcd->self.controller);
458
459 error = ohci_da8xx_register_notify(hcd);
460 if (error)
461 goto err_remove_hcd;
462
463 return 0;
464
465err_remove_hcd:
466 usb_remove_hcd(hcd);
467err:
468 usb_put_hcd(hcd);
469 return error;
470}
471
472static int ohci_da8xx_remove(struct platform_device *pdev)
473{
474 struct usb_hcd *hcd = platform_get_drvdata(pdev);
475
476 usb_remove_hcd(hcd);
477 usb_put_hcd(hcd);
478
479 return 0;
480}
481
482#ifdef CONFIG_PM
483static int ohci_da8xx_suspend(struct platform_device *pdev,
484 pm_message_t message)
485{
486 struct usb_hcd *hcd = platform_get_drvdata(pdev);
487 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
488 bool do_wakeup = device_may_wakeup(&pdev->dev);
489 int ret;
490
491
492 if (time_before(jiffies, ohci->next_statechange))
493 msleep(5);
494 ohci->next_statechange = jiffies;
495
496 ret = ohci_suspend(hcd, do_wakeup);
497 if (ret)
498 return ret;
499
500 ohci_da8xx_disable(hcd);
501 hcd->state = HC_STATE_SUSPENDED;
502
503 return ret;
504}
505
506static int ohci_da8xx_resume(struct platform_device *dev)
507{
508 struct usb_hcd *hcd = platform_get_drvdata(dev);
509 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
510 int ret;
511
512 if (time_before(jiffies, ohci->next_statechange))
513 msleep(5);
514 ohci->next_statechange = jiffies;
515
516 ret = ohci_da8xx_enable(hcd);
517 if (ret)
518 return ret;
519
520 ohci_resume(hcd, false);
521
522 return 0;
523}
524#endif
525
526static const struct ohci_driver_overrides da8xx_overrides __initconst = {
527 .reset = ohci_da8xx_reset,
528 .extra_priv_size = sizeof(struct da8xx_ohci_hcd),
529};
530
531/*
532 * Driver definition to register with platform structure.
533 */
534static struct platform_driver ohci_hcd_da8xx_driver = {
535 .probe = ohci_da8xx_probe,
536 .remove = ohci_da8xx_remove,
537 .shutdown = usb_hcd_platform_shutdown,
538#ifdef CONFIG_PM
539 .suspend = ohci_da8xx_suspend,
540 .resume = ohci_da8xx_resume,
541#endif
542 .driver = {
543 .name = DRV_NAME,
544 .of_match_table = of_match_ptr(da8xx_ohci_ids),
545 },
546};
547
548static int __init ohci_da8xx_init(void)
549{
550
551 if (usb_disabled())
552 return -ENODEV;
553
554 ohci_init_driver(&ohci_da8xx_hc_driver, &da8xx_overrides);
555
556 /*
557 * The Davinci da8xx HW has some unusual quirks, which require
558 * da8xx-specific workarounds. We override certain hc_driver
559 * functions here to achieve that. We explicitly do not enhance
560 * ohci_driver_overrides to allow this more easily, since this
561 * is an unusual case, and we don't want to encourage others to
562 * override these functions by making it too easy.
563 */
564
565 orig_ohci_hub_control = ohci_da8xx_hc_driver.hub_control;
566 orig_ohci_hub_status_data = ohci_da8xx_hc_driver.hub_status_data;
567
568 ohci_da8xx_hc_driver.hub_status_data = ohci_da8xx_hub_status_data;
569 ohci_da8xx_hc_driver.hub_control = ohci_da8xx_hub_control;
570
571 return platform_driver_register(&ohci_hcd_da8xx_driver);
572}
573module_init(ohci_da8xx_init);
574
575static void __exit ohci_da8xx_exit(void)
576{
577 platform_driver_unregister(&ohci_hcd_da8xx_driver);
578}
579module_exit(ohci_da8xx_exit);
580MODULE_DESCRIPTION(DRIVER_DESC);
581MODULE_LICENSE("GPL");
582MODULE_ALIAS("platform:" DRV_NAME);
1/*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * TI DA8xx (OMAP-L1x) Bus Glue
5 *
6 * Derived from: ohci-omap.c and ohci-s3c2410.c
7 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
8 *
9 * This file is licensed under the terms of the GNU General Public License
10 * version 2. This program is licensed "as is" without any warranty of any
11 * kind, whether express or implied.
12 */
13
14#include <linux/clk.h>
15#include <linux/io.h>
16#include <linux/interrupt.h>
17#include <linux/jiffies.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <linux/phy/phy.h>
22#include <linux/platform_data/usb-davinci.h>
23#include <linux/regulator/consumer.h>
24#include <linux/usb.h>
25#include <linux/usb/hcd.h>
26#include <asm/unaligned.h>
27
28#include "ohci.h"
29
30#define DRIVER_DESC "DA8XX"
31#define DRV_NAME "ohci-da8xx"
32
33static struct hc_driver __read_mostly ohci_da8xx_hc_driver;
34
35static int (*orig_ohci_hub_control)(struct usb_hcd *hcd, u16 typeReq,
36 u16 wValue, u16 wIndex, char *buf, u16 wLength);
37static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf);
38
39struct da8xx_ohci_hcd {
40 struct usb_hcd *hcd;
41 struct clk *usb11_clk;
42 struct phy *usb11_phy;
43 struct regulator *vbus_reg;
44 struct notifier_block nb;
45 unsigned int reg_enabled;
46};
47
48#define to_da8xx_ohci(hcd) (struct da8xx_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
49
50/* Over-current indicator change bitmask */
51static volatile u16 ocic_mask;
52
53static int ohci_da8xx_enable(struct usb_hcd *hcd)
54{
55 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
56 int ret;
57
58 ret = clk_prepare_enable(da8xx_ohci->usb11_clk);
59 if (ret)
60 return ret;
61
62 ret = phy_init(da8xx_ohci->usb11_phy);
63 if (ret)
64 goto err_phy_init;
65
66 ret = phy_power_on(da8xx_ohci->usb11_phy);
67 if (ret)
68 goto err_phy_power_on;
69
70 return 0;
71
72err_phy_power_on:
73 phy_exit(da8xx_ohci->usb11_phy);
74err_phy_init:
75 clk_disable_unprepare(da8xx_ohci->usb11_clk);
76
77 return ret;
78}
79
80static void ohci_da8xx_disable(struct usb_hcd *hcd)
81{
82 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
83
84 phy_power_off(da8xx_ohci->usb11_phy);
85 phy_exit(da8xx_ohci->usb11_phy);
86 clk_disable_unprepare(da8xx_ohci->usb11_clk);
87}
88
89static int ohci_da8xx_set_power(struct usb_hcd *hcd, int on)
90{
91 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
92 struct device *dev = hcd->self.controller;
93 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
94 int ret;
95
96 if (hub && hub->set_power)
97 return hub->set_power(1, on);
98
99 if (!da8xx_ohci->vbus_reg)
100 return 0;
101
102 if (on && !da8xx_ohci->reg_enabled) {
103 ret = regulator_enable(da8xx_ohci->vbus_reg);
104 if (ret) {
105 dev_err(dev, "Failed to enable regulator: %d\n", ret);
106 return ret;
107 }
108 da8xx_ohci->reg_enabled = 1;
109
110 } else if (!on && da8xx_ohci->reg_enabled) {
111 ret = regulator_disable(da8xx_ohci->vbus_reg);
112 if (ret) {
113 dev_err(dev, "Failed to disable regulator: %d\n", ret);
114 return ret;
115 }
116 da8xx_ohci->reg_enabled = 0;
117 }
118
119 return 0;
120}
121
122static int ohci_da8xx_get_power(struct usb_hcd *hcd)
123{
124 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
125 struct device *dev = hcd->self.controller;
126 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
127
128 if (hub && hub->get_power)
129 return hub->get_power(1);
130
131 if (da8xx_ohci->vbus_reg)
132 return regulator_is_enabled(da8xx_ohci->vbus_reg);
133
134 return 1;
135}
136
137static int ohci_da8xx_get_oci(struct usb_hcd *hcd)
138{
139 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
140 struct device *dev = hcd->self.controller;
141 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
142 unsigned int flags;
143 int ret;
144
145 if (hub && hub->get_oci)
146 return hub->get_oci(1);
147
148 if (!da8xx_ohci->vbus_reg)
149 return 0;
150
151 ret = regulator_get_error_flags(da8xx_ohci->vbus_reg, &flags);
152 if (ret)
153 return ret;
154
155 if (flags & REGULATOR_ERROR_OVER_CURRENT)
156 return 1;
157
158 return 0;
159}
160
161static int ohci_da8xx_has_set_power(struct usb_hcd *hcd)
162{
163 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
164 struct device *dev = hcd->self.controller;
165 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
166
167 if (hub && hub->set_power)
168 return 1;
169
170 if (da8xx_ohci->vbus_reg)
171 return 1;
172
173 return 0;
174}
175
176static int ohci_da8xx_has_oci(struct usb_hcd *hcd)
177{
178 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
179 struct device *dev = hcd->self.controller;
180 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
181
182 if (hub && hub->get_oci)
183 return 1;
184
185 if (da8xx_ohci->vbus_reg)
186 return 1;
187
188 return 0;
189}
190
191static int ohci_da8xx_has_potpgt(struct usb_hcd *hcd)
192{
193 struct device *dev = hcd->self.controller;
194 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
195
196 if (hub && hub->potpgt)
197 return 1;
198
199 return 0;
200}
201
202/*
203 * Handle the port over-current indicator change.
204 */
205static void ohci_da8xx_ocic_handler(struct da8xx_ohci_root_hub *hub,
206 unsigned port)
207{
208 ocic_mask |= 1 << port;
209
210 /* Once over-current is detected, the port needs to be powered down */
211 if (hub->get_oci(port) > 0)
212 hub->set_power(port, 0);
213}
214
215static int ohci_da8xx_regulator_event(struct notifier_block *nb,
216 unsigned long event, void *data)
217{
218 struct da8xx_ohci_hcd *da8xx_ohci =
219 container_of(nb, struct da8xx_ohci_hcd, nb);
220
221 if (event & REGULATOR_EVENT_OVER_CURRENT) {
222 ocic_mask |= 1 << 1;
223 ohci_da8xx_set_power(da8xx_ohci->hcd, 0);
224 }
225
226 return 0;
227}
228
229static int ohci_da8xx_register_notify(struct usb_hcd *hcd)
230{
231 struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
232 struct device *dev = hcd->self.controller;
233 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
234 int ret = 0;
235
236 if (hub && hub->ocic_notify) {
237 ret = hub->ocic_notify(ohci_da8xx_ocic_handler);
238 } else if (da8xx_ohci->vbus_reg) {
239 da8xx_ohci->nb.notifier_call = ohci_da8xx_regulator_event;
240 ret = devm_regulator_register_notifier(da8xx_ohci->vbus_reg,
241 &da8xx_ohci->nb);
242 }
243
244 if (ret)
245 dev_err(dev, "Failed to register notifier: %d\n", ret);
246
247 return ret;
248}
249
250static void ohci_da8xx_unregister_notify(struct usb_hcd *hcd)
251{
252 struct device *dev = hcd->self.controller;
253 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
254
255 if (hub && hub->ocic_notify)
256 hub->ocic_notify(NULL);
257}
258
259static int ohci_da8xx_reset(struct usb_hcd *hcd)
260{
261 struct device *dev = hcd->self.controller;
262 struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
263 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
264 int result;
265 u32 rh_a;
266
267 dev_dbg(dev, "starting USB controller\n");
268
269 result = ohci_da8xx_enable(hcd);
270 if (result < 0)
271 return result;
272
273 /*
274 * DA8xx only have 1 port connected to the pins but the HC root hub
275 * register A reports 2 ports, thus we'll have to override it...
276 */
277 ohci->num_ports = 1;
278
279 result = ohci_setup(hcd);
280 if (result < 0) {
281 ohci_da8xx_disable(hcd);
282 return result;
283 }
284
285 /*
286 * Since we're providing a board-specific root hub port power control
287 * and over-current reporting, we have to override the HC root hub A
288 * register's default value, so that ohci_hub_control() could return
289 * the correct hub descriptor...
290 */
291 rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
292 if (ohci_da8xx_has_set_power(hcd)) {
293 rh_a &= ~RH_A_NPS;
294 rh_a |= RH_A_PSM;
295 }
296 if (ohci_da8xx_has_oci(hcd)) {
297 rh_a &= ~RH_A_NOCP;
298 rh_a |= RH_A_OCPM;
299 }
300 if (ohci_da8xx_has_potpgt(hcd)) {
301 rh_a &= ~RH_A_POTPGT;
302 rh_a |= hub->potpgt << 24;
303 }
304 ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
305
306 return result;
307}
308
309/*
310 * Update the status data from the hub with the over-current indicator change.
311 */
312static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf)
313{
314 int length = orig_ohci_hub_status_data(hcd, buf);
315
316 /* See if we have OCIC bit set on port 1 */
317 if (ocic_mask & (1 << 1)) {
318 dev_dbg(hcd->self.controller, "over-current indicator change "
319 "on port 1\n");
320
321 if (!length)
322 length = 1;
323
324 buf[0] |= 1 << 1;
325 }
326 return length;
327}
328
329/*
330 * Look at the control requests to the root hub and see if we need to override.
331 */
332static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
333 u16 wIndex, char *buf, u16 wLength)
334{
335 struct device *dev = hcd->self.controller;
336 int temp;
337
338 switch (typeReq) {
339 case GetPortStatus:
340 /* Check the port number */
341 if (wIndex != 1)
342 break;
343
344 dev_dbg(dev, "GetPortStatus(%u)\n", wIndex);
345
346 temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1);
347
348 /* The port power status (PPS) bit defaults to 1 */
349 if (!ohci_da8xx_get_power(hcd))
350 temp &= ~RH_PS_PPS;
351
352 /* The port over-current indicator (POCI) bit is always 0 */
353 if (ohci_da8xx_get_oci(hcd) > 0)
354 temp |= RH_PS_POCI;
355
356 /* The over-current indicator change (OCIC) bit is 0 too */
357 if (ocic_mask & (1 << wIndex))
358 temp |= RH_PS_OCIC;
359
360 put_unaligned(cpu_to_le32(temp), (__le32 *)buf);
361 return 0;
362 case SetPortFeature:
363 temp = 1;
364 goto check_port;
365 case ClearPortFeature:
366 temp = 0;
367
368check_port:
369 /* Check the port number */
370 if (wIndex != 1)
371 break;
372
373 switch (wValue) {
374 case USB_PORT_FEAT_POWER:
375 dev_dbg(dev, "%sPortFeature(%u): %s\n",
376 temp ? "Set" : "Clear", wIndex, "POWER");
377
378 return ohci_da8xx_set_power(hcd, temp) ? -EPIPE : 0;
379 case USB_PORT_FEAT_C_OVER_CURRENT:
380 dev_dbg(dev, "%sPortFeature(%u): %s\n",
381 temp ? "Set" : "Clear", wIndex,
382 "C_OVER_CURRENT");
383
384 if (temp)
385 ocic_mask |= 1 << wIndex;
386 else
387 ocic_mask &= ~(1 << wIndex);
388 return 0;
389 }
390 }
391
392 return orig_ohci_hub_control(hcd, typeReq, wValue,
393 wIndex, buf, wLength);
394}
395
396/*-------------------------------------------------------------------------*/
397#ifdef CONFIG_OF
398static const struct of_device_id da8xx_ohci_ids[] = {
399 { .compatible = "ti,da830-ohci" },
400 { }
401};
402MODULE_DEVICE_TABLE(of, da8xx_ohci_ids);
403#endif
404
405static int ohci_da8xx_probe(struct platform_device *pdev)
406{
407 struct da8xx_ohci_hcd *da8xx_ohci;
408 struct usb_hcd *hcd;
409 struct resource *mem;
410 int error, irq;
411 hcd = usb_create_hcd(&ohci_da8xx_hc_driver, &pdev->dev,
412 dev_name(&pdev->dev));
413 if (!hcd)
414 return -ENOMEM;
415
416 da8xx_ohci = to_da8xx_ohci(hcd);
417 da8xx_ohci->hcd = hcd;
418
419 da8xx_ohci->usb11_clk = devm_clk_get(&pdev->dev, "usb11");
420 if (IS_ERR(da8xx_ohci->usb11_clk)) {
421 error = PTR_ERR(da8xx_ohci->usb11_clk);
422 if (error != -EPROBE_DEFER)
423 dev_err(&pdev->dev, "Failed to get clock.\n");
424 goto err;
425 }
426
427 da8xx_ohci->usb11_phy = devm_phy_get(&pdev->dev, "usb-phy");
428 if (IS_ERR(da8xx_ohci->usb11_phy)) {
429 error = PTR_ERR(da8xx_ohci->usb11_phy);
430 if (error != -EPROBE_DEFER)
431 dev_err(&pdev->dev, "Failed to get phy.\n");
432 goto err;
433 }
434
435 da8xx_ohci->vbus_reg = devm_regulator_get_optional(&pdev->dev, "vbus");
436 if (IS_ERR(da8xx_ohci->vbus_reg)) {
437 error = PTR_ERR(da8xx_ohci->vbus_reg);
438 if (error == -ENODEV) {
439 da8xx_ohci->vbus_reg = NULL;
440 } else if (error == -EPROBE_DEFER) {
441 goto err;
442 } else {
443 dev_err(&pdev->dev, "Failed to get regulator\n");
444 goto err;
445 }
446 }
447
448 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
449 hcd->regs = devm_ioremap_resource(&pdev->dev, mem);
450 if (IS_ERR(hcd->regs)) {
451 error = PTR_ERR(hcd->regs);
452 goto err;
453 }
454 hcd->rsrc_start = mem->start;
455 hcd->rsrc_len = resource_size(mem);
456
457 irq = platform_get_irq(pdev, 0);
458 if (irq < 0) {
459 error = -ENODEV;
460 goto err;
461 }
462
463 error = usb_add_hcd(hcd, irq, 0);
464 if (error)
465 goto err;
466
467 device_wakeup_enable(hcd->self.controller);
468
469 error = ohci_da8xx_register_notify(hcd);
470 if (error)
471 goto err_remove_hcd;
472
473 return 0;
474
475err_remove_hcd:
476 usb_remove_hcd(hcd);
477err:
478 usb_put_hcd(hcd);
479 return error;
480}
481
482static int ohci_da8xx_remove(struct platform_device *pdev)
483{
484 struct usb_hcd *hcd = platform_get_drvdata(pdev);
485
486 ohci_da8xx_unregister_notify(hcd);
487 usb_remove_hcd(hcd);
488 usb_put_hcd(hcd);
489
490 return 0;
491}
492
493#ifdef CONFIG_PM
494static int ohci_da8xx_suspend(struct platform_device *pdev,
495 pm_message_t message)
496{
497 struct usb_hcd *hcd = platform_get_drvdata(pdev);
498 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
499 bool do_wakeup = device_may_wakeup(&pdev->dev);
500 int ret;
501
502
503 if (time_before(jiffies, ohci->next_statechange))
504 msleep(5);
505 ohci->next_statechange = jiffies;
506
507 ret = ohci_suspend(hcd, do_wakeup);
508 if (ret)
509 return ret;
510
511 ohci_da8xx_disable(hcd);
512 hcd->state = HC_STATE_SUSPENDED;
513
514 return ret;
515}
516
517static int ohci_da8xx_resume(struct platform_device *dev)
518{
519 struct usb_hcd *hcd = platform_get_drvdata(dev);
520 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
521 int ret;
522
523 if (time_before(jiffies, ohci->next_statechange))
524 msleep(5);
525 ohci->next_statechange = jiffies;
526
527 ret = ohci_da8xx_enable(hcd);
528 if (ret)
529 return ret;
530
531 ohci_resume(hcd, false);
532
533 return 0;
534}
535#endif
536
537static const struct ohci_driver_overrides da8xx_overrides __initconst = {
538 .reset = ohci_da8xx_reset,
539 .extra_priv_size = sizeof(struct da8xx_ohci_hcd),
540};
541
542/*
543 * Driver definition to register with platform structure.
544 */
545static struct platform_driver ohci_hcd_da8xx_driver = {
546 .probe = ohci_da8xx_probe,
547 .remove = ohci_da8xx_remove,
548 .shutdown = usb_hcd_platform_shutdown,
549#ifdef CONFIG_PM
550 .suspend = ohci_da8xx_suspend,
551 .resume = ohci_da8xx_resume,
552#endif
553 .driver = {
554 .name = DRV_NAME,
555 .of_match_table = of_match_ptr(da8xx_ohci_ids),
556 },
557};
558
559static int __init ohci_da8xx_init(void)
560{
561
562 if (usb_disabled())
563 return -ENODEV;
564
565 pr_info("%s: " DRIVER_DESC "\n", DRV_NAME);
566 ohci_init_driver(&ohci_da8xx_hc_driver, &da8xx_overrides);
567
568 /*
569 * The Davinci da8xx HW has some unusual quirks, which require
570 * da8xx-specific workarounds. We override certain hc_driver
571 * functions here to achieve that. We explicitly do not enhance
572 * ohci_driver_overrides to allow this more easily, since this
573 * is an unusual case, and we don't want to encourage others to
574 * override these functions by making it too easy.
575 */
576
577 orig_ohci_hub_control = ohci_da8xx_hc_driver.hub_control;
578 orig_ohci_hub_status_data = ohci_da8xx_hc_driver.hub_status_data;
579
580 ohci_da8xx_hc_driver.hub_status_data = ohci_da8xx_hub_status_data;
581 ohci_da8xx_hc_driver.hub_control = ohci_da8xx_hub_control;
582
583 return platform_driver_register(&ohci_hcd_da8xx_driver);
584}
585module_init(ohci_da8xx_init);
586
587static void __exit ohci_da8xx_exit(void)
588{
589 platform_driver_unregister(&ohci_hcd_da8xx_driver);
590}
591module_exit(ohci_da8xx_exit);
592MODULE_DESCRIPTION(DRIVER_DESC);
593MODULE_LICENSE("GPL");
594MODULE_ALIAS("platform:" DRV_NAME);