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