1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3 * OHCI HCD (Host Controller Driver) for USB.
4 *
5 * Copyright (C) 2004 SAN People (Pty) Ltd.
6 * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
7 *
8 * AT91 Bus Glue
9 *
10 * Based on fragments of 2.4 driver by Rick Bronson.
11 * Based on ohci-omap.c
12 *
13 * This file is licenced under the GPL.
14 */
15
16 #include <linux/arm-smccc.h>
17 #include <linux/clk.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/gpio/consumer.h>
20 #include <linux/of_platform.h>
21 #include <linux/platform_device.h>
22 #include <linux/platform_data/atmel.h>
23 #include <linux/io.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/mfd/syscon.h>
27 #include <linux/regmap.h>
28 #include <linux/usb.h>
29 #include <linux/usb/hcd.h>
30 #include <soc/at91/atmel-sfr.h>
31
32 #include "ohci.h"
33
34 #define valid_port(index) ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
35 #define at91_for_each_port(index) \
36 for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
37
38 /* interface, function and usb clocks; sometimes also an AHB clock */
39 #define hcd_to_ohci_at91_priv(h) \
40 ((struct ohci_at91_priv *)hcd_to_ohci(h)->priv)
41
42 #define AT91_MAX_USBH_PORTS 3
43 struct at91_usbh_data {
44 struct gpio_desc *vbus_pin[AT91_MAX_USBH_PORTS];
45 struct gpio_desc *overcurrent_pin[AT91_MAX_USBH_PORTS];
46 u8 ports; /* number of ports on root hub */
47 u8 overcurrent_supported;
48 u8 overcurrent_status[AT91_MAX_USBH_PORTS];
49 u8 overcurrent_changed[AT91_MAX_USBH_PORTS];
50 };
51
52 struct ohci_at91_priv {
53 struct clk *iclk;
54 struct clk *fclk;
55 struct clk *hclk;
56 bool clocked;
57 bool wakeup; /* Saved wake-up state for resume */
58 struct regmap *sfr_regmap;
59 u32 suspend_smc_id;
60 };
61 /* interface and function clocks; sometimes also an AHB clock */
62
63 #define DRIVER_DESC "OHCI Atmel driver"
64
65 static struct hc_driver __read_mostly ohci_at91_hc_driver;
66
67 static const struct ohci_driver_overrides ohci_at91_drv_overrides __initconst = {
68 .extra_priv_size = sizeof(struct ohci_at91_priv),
69 };
70
71 /*-------------------------------------------------------------------------*/
72
at91_start_clock(struct ohci_at91_priv * ohci_at91)73 static void at91_start_clock(struct ohci_at91_priv *ohci_at91)
74 {
75 if (ohci_at91->clocked)
76 return;
77
78 clk_set_rate(ohci_at91->fclk, 48000000);
79 clk_prepare_enable(ohci_at91->hclk);
80 clk_prepare_enable(ohci_at91->iclk);
81 clk_prepare_enable(ohci_at91->fclk);
82 ohci_at91->clocked = true;
83 }
84
at91_stop_clock(struct ohci_at91_priv * ohci_at91)85 static void at91_stop_clock(struct ohci_at91_priv *ohci_at91)
86 {
87 if (!ohci_at91->clocked)
88 return;
89
90 clk_disable_unprepare(ohci_at91->fclk);
91 clk_disable_unprepare(ohci_at91->iclk);
92 clk_disable_unprepare(ohci_at91->hclk);
93 ohci_at91->clocked = false;
94 }
95
at91_start_hc(struct platform_device * pdev)96 static void at91_start_hc(struct platform_device *pdev)
97 {
98 struct usb_hcd *hcd = platform_get_drvdata(pdev);
99 struct ohci_regs __iomem *regs = hcd->regs;
100 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
101
102 dev_dbg(&pdev->dev, "start\n");
103
104 /*
105 * Start the USB clocks.
106 */
107 at91_start_clock(ohci_at91);
108
109 /*
110 * The USB host controller must remain in reset.
111 */
112 writel(0, ®s->control);
113 }
114
at91_stop_hc(struct platform_device * pdev)115 static void at91_stop_hc(struct platform_device *pdev)
116 {
117 struct usb_hcd *hcd = platform_get_drvdata(pdev);
118 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
119
120 dev_dbg(&pdev->dev, "stop\n");
121
122 /*
123 * Put the USB host controller into reset.
124 */
125 usb_hcd_platform_shutdown(pdev);
126
127 /*
128 * Stop the USB clocks.
129 */
130 at91_stop_clock(ohci_at91);
131 }
132
133
134 /*-------------------------------------------------------------------------*/
135
136 static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
137
at91_dt_suspend_smc(struct device * dev)138 static u32 at91_dt_suspend_smc(struct device *dev)
139 {
140 u32 suspend_smc_id;
141
142 if (!dev->of_node)
143 return 0;
144
145 if (of_property_read_u32(dev->of_node, "microchip,suspend-smc-id", &suspend_smc_id))
146 return 0;
147
148 return suspend_smc_id;
149 }
150
at91_dt_syscon_sfr(void)151 static struct regmap *at91_dt_syscon_sfr(void)
152 {
153 struct regmap *regmap;
154
155 regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-sfr");
156 if (IS_ERR(regmap)) {
157 regmap = syscon_regmap_lookup_by_compatible("microchip,sam9x60-sfr");
158 if (IS_ERR(regmap))
159 regmap = NULL;
160 }
161
162 return regmap;
163 }
164
165 /* configure so an HC device and id are always provided */
166 /* always called with process context; sleeping is OK */
167
168
169 /*
170 * usb_hcd_at91_probe - initialize AT91-based HCDs
171 * @driver: Pointer to hc driver instance
172 * @pdev: USB controller to probe
173 *
174 * Context: task context, might sleep
175 *
176 * Allocates basic resources for this USB host controller, and
177 * then invokes the start() method for the HCD associated with it
178 * through the hotplug entry's driver_data.
179 */
usb_hcd_at91_probe(const struct hc_driver * driver,struct platform_device * pdev)180 static int usb_hcd_at91_probe(const struct hc_driver *driver,
181 struct platform_device *pdev)
182 {
183 struct at91_usbh_data *board;
184 struct ohci_hcd *ohci;
185 int retval;
186 struct usb_hcd *hcd;
187 struct ohci_at91_priv *ohci_at91;
188 struct device *dev = &pdev->dev;
189 struct resource *res;
190 int irq;
191
192 irq = platform_get_irq(pdev, 0);
193 if (irq < 0) {
194 dev_dbg(dev, "hcd probe: missing irq resource\n");
195 return irq;
196 }
197
198 hcd = usb_create_hcd(driver, dev, "at91");
199 if (!hcd)
200 return -ENOMEM;
201 ohci_at91 = hcd_to_ohci_at91_priv(hcd);
202
203 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
204 hcd->regs = devm_ioremap_resource(dev, res);
205 if (IS_ERR(hcd->regs)) {
206 retval = PTR_ERR(hcd->regs);
207 goto err;
208 }
209 hcd->rsrc_start = res->start;
210 hcd->rsrc_len = resource_size(res);
211
212 ohci_at91->iclk = devm_clk_get(dev, "ohci_clk");
213 if (IS_ERR(ohci_at91->iclk)) {
214 dev_err(dev, "failed to get ohci_clk\n");
215 retval = PTR_ERR(ohci_at91->iclk);
216 goto err;
217 }
218 ohci_at91->fclk = devm_clk_get(dev, "uhpck");
219 if (IS_ERR(ohci_at91->fclk)) {
220 dev_err(dev, "failed to get uhpck\n");
221 retval = PTR_ERR(ohci_at91->fclk);
222 goto err;
223 }
224 ohci_at91->hclk = devm_clk_get(dev, "hclk");
225 if (IS_ERR(ohci_at91->hclk)) {
226 dev_err(dev, "failed to get hclk\n");
227 retval = PTR_ERR(ohci_at91->hclk);
228 goto err;
229 }
230
231 ohci_at91->suspend_smc_id = at91_dt_suspend_smc(dev);
232 if (!ohci_at91->suspend_smc_id) {
233 dev_dbg(dev, "failed to find sfr suspend smc id, using regmap\n");
234 ohci_at91->sfr_regmap = at91_dt_syscon_sfr();
235 if (!ohci_at91->sfr_regmap)
236 dev_dbg(dev, "failed to find sfr node\n");
237 }
238
239 board = hcd->self.controller->platform_data;
240 ohci = hcd_to_ohci(hcd);
241 ohci->num_ports = board->ports;
242 at91_start_hc(pdev);
243
244 /*
245 * The RemoteWakeupConnected bit has to be set explicitly
246 * before calling ohci_run. The reset value of this bit is 0.
247 */
248 ohci->hc_control = OHCI_CTRL_RWC;
249
250 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
251 if (retval == 0) {
252 device_wakeup_enable(hcd->self.controller);
253 return retval;
254 }
255
256 /* Error handling */
257 at91_stop_hc(pdev);
258
259 err:
260 usb_put_hcd(hcd);
261 return retval;
262 }
263
264
265 /* may be called with controller, bus, and devices active */
266
267 /*
268 * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
269 * @hcd: USB controller to remove
270 * @pdev: Platform device required for cleanup
271 *
272 * Context: task context, might sleep
273 *
274 * Reverses the effect of usb_hcd_at91_probe(), first invoking
275 * the HCD's stop() method. It is always called from a thread
276 * context, "rmmod" or something similar.
277 */
usb_hcd_at91_remove(struct usb_hcd * hcd,struct platform_device * pdev)278 static void usb_hcd_at91_remove(struct usb_hcd *hcd,
279 struct platform_device *pdev)
280 {
281 usb_remove_hcd(hcd);
282 at91_stop_hc(pdev);
283 usb_put_hcd(hcd);
284 }
285
286 /*-------------------------------------------------------------------------*/
ohci_at91_usb_set_power(struct at91_usbh_data * pdata,int port,int enable)287 static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
288 {
289 if (!valid_port(port))
290 return;
291
292 gpiod_set_value(pdata->vbus_pin[port], enable);
293 }
294
ohci_at91_usb_get_power(struct at91_usbh_data * pdata,int port)295 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
296 {
297 if (!valid_port(port))
298 return -EINVAL;
299
300 return gpiod_get_value(pdata->vbus_pin[port]);
301 }
302
303 /*
304 * Update the status data from the hub with the over-current indicator change.
305 */
ohci_at91_hub_status_data(struct usb_hcd * hcd,char * buf)306 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
307 {
308 struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
309 int length = ohci_hub_status_data(hcd, buf);
310 int port;
311
312 at91_for_each_port(port) {
313 if (pdata->overcurrent_changed[port]) {
314 if (!length)
315 length = 1;
316 buf[0] |= 1 << (port + 1);
317 }
318 }
319
320 return length;
321 }
322
ohci_at91_port_suspend(struct ohci_at91_priv * ohci_at91,u8 set)323 static int ohci_at91_port_suspend(struct ohci_at91_priv *ohci_at91, u8 set)
324 {
325 struct regmap *regmap = ohci_at91->sfr_regmap;
326 u32 regval;
327 int ret;
328
329 if (ohci_at91->suspend_smc_id) {
330 struct arm_smccc_res res;
331
332 arm_smccc_smc(ohci_at91->suspend_smc_id, set, 0, 0, 0, 0, 0, 0, &res);
333 if (res.a0)
334 return -EINVAL;
335 } else if (regmap) {
336 ret = regmap_read(regmap, AT91_SFR_OHCIICR, ®val);
337 if (ret)
338 return ret;
339
340 if (set)
341 regval |= AT91_OHCIICR_USB_SUSPEND;
342 else
343 regval &= ~AT91_OHCIICR_USB_SUSPEND;
344
345 regmap_write(regmap, AT91_SFR_OHCIICR, regval);
346 }
347
348 return 0;
349 }
350
351 /*
352 * Look at the control requests to the root hub and see if we need to override.
353 */
ohci_at91_hub_control(struct usb_hcd * hcd,u16 typeReq,u16 wValue,u16 wIndex,char * buf,u16 wLength)354 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
355 u16 wIndex, char *buf, u16 wLength)
356 {
357 struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
358 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
359 struct usb_hub_descriptor *desc;
360 int ret = -EINVAL;
361 u32 *data = (u32 *)buf;
362
363 dev_dbg(hcd->self.controller,
364 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
365 hcd, typeReq, wValue, wIndex, buf, wLength);
366
367 wIndex--;
368
369 switch (typeReq) {
370 case SetPortFeature:
371 switch (wValue) {
372 case USB_PORT_FEAT_POWER:
373 dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
374 if (valid_port(wIndex)) {
375 ohci_at91_usb_set_power(pdata, wIndex, 1);
376 ret = 0;
377 }
378
379 goto out;
380
381 case USB_PORT_FEAT_SUSPEND:
382 dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n");
383 if (valid_port(wIndex)) {
384 ohci_at91_port_suspend(ohci_at91, 1);
385 return 0;
386 }
387 break;
388 }
389 break;
390
391 case ClearPortFeature:
392 switch (wValue) {
393 case USB_PORT_FEAT_C_OVER_CURRENT:
394 dev_dbg(hcd->self.controller,
395 "ClearPortFeature: C_OVER_CURRENT\n");
396
397 if (valid_port(wIndex)) {
398 pdata->overcurrent_changed[wIndex] = 0;
399 pdata->overcurrent_status[wIndex] = 0;
400 }
401
402 goto out;
403
404 case USB_PORT_FEAT_OVER_CURRENT:
405 dev_dbg(hcd->self.controller,
406 "ClearPortFeature: OVER_CURRENT\n");
407
408 if (valid_port(wIndex))
409 pdata->overcurrent_status[wIndex] = 0;
410
411 goto out;
412
413 case USB_PORT_FEAT_POWER:
414 dev_dbg(hcd->self.controller,
415 "ClearPortFeature: POWER\n");
416
417 if (valid_port(wIndex)) {
418 ohci_at91_usb_set_power(pdata, wIndex, 0);
419 return 0;
420 }
421 break;
422
423 case USB_PORT_FEAT_SUSPEND:
424 dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n");
425 if (valid_port(wIndex)) {
426 ohci_at91_port_suspend(ohci_at91, 0);
427 return 0;
428 }
429 break;
430 }
431 break;
432 }
433
434 ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
435 if (ret)
436 goto out;
437
438 switch (typeReq) {
439 case GetHubDescriptor:
440
441 /* update the hub's descriptor */
442
443 desc = (struct usb_hub_descriptor *)buf;
444
445 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
446 desc->wHubCharacteristics);
447
448 /* remove the old configurations for power-switching, and
449 * over-current protection, and insert our new configuration
450 */
451
452 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
453 desc->wHubCharacteristics |=
454 cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM);
455
456 if (pdata->overcurrent_supported) {
457 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
458 desc->wHubCharacteristics |=
459 cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM);
460 }
461
462 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
463 desc->wHubCharacteristics);
464
465 return ret;
466
467 case GetPortStatus:
468 /* check port status */
469
470 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
471
472 if (valid_port(wIndex)) {
473 if (!ohci_at91_usb_get_power(pdata, wIndex))
474 *data &= ~cpu_to_le32(RH_PS_PPS);
475
476 if (pdata->overcurrent_changed[wIndex])
477 *data |= cpu_to_le32(RH_PS_OCIC);
478
479 if (pdata->overcurrent_status[wIndex])
480 *data |= cpu_to_le32(RH_PS_POCI);
481 }
482 }
483
484 out:
485 return ret;
486 }
487
488 /*-------------------------------------------------------------------------*/
489
ohci_hcd_at91_overcurrent_irq(int irq,void * data)490 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
491 {
492 struct platform_device *pdev = data;
493 struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
494 int val, port;
495
496 /* From the GPIO notifying the over-current situation, find
497 * out the corresponding port */
498 at91_for_each_port(port) {
499 if (gpiod_to_irq(pdata->overcurrent_pin[port]) == irq)
500 break;
501 }
502
503 if (port == AT91_MAX_USBH_PORTS) {
504 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
505 return IRQ_HANDLED;
506 }
507
508 val = gpiod_get_value(pdata->overcurrent_pin[port]);
509
510 /* When notified of an over-current situation, disable power
511 on the corresponding port, and mark this port in
512 over-current. */
513 if (!val) {
514 ohci_at91_usb_set_power(pdata, port, 0);
515 pdata->overcurrent_status[port] = 1;
516 pdata->overcurrent_changed[port] = 1;
517 }
518
519 dev_dbg(& pdev->dev, "overcurrent situation %s\n",
520 val ? "exited" : "notified");
521
522 return IRQ_HANDLED;
523 }
524
525 static const struct of_device_id at91_ohci_dt_ids[] = {
526 { .compatible = "atmel,at91rm9200-ohci" },
527 { /* sentinel */ }
528 };
529
530 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
531
532 /*-------------------------------------------------------------------------*/
533
ohci_hcd_at91_drv_probe(struct platform_device * pdev)534 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
535 {
536 struct device_node *np = pdev->dev.of_node;
537 struct at91_usbh_data *pdata;
538 int i;
539 int ret;
540 int err;
541 u32 ports;
542
543 /* Right now device-tree probed devices don't get dma_mask set.
544 * Since shared usb code relies on it, set it here for now.
545 * Once we have dma capability bindings this can go away.
546 */
547 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
548 if (ret)
549 return ret;
550
551 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
552 if (!pdata)
553 return -ENOMEM;
554
555 pdev->dev.platform_data = pdata;
556
557 if (!of_property_read_u32(np, "num-ports", &ports))
558 pdata->ports = ports;
559
560 at91_for_each_port(i) {
561 if (i >= pdata->ports)
562 break;
563
564 pdata->vbus_pin[i] =
565 devm_gpiod_get_index_optional(&pdev->dev, "atmel,vbus",
566 i, GPIOD_OUT_HIGH);
567 if (IS_ERR(pdata->vbus_pin[i])) {
568 err = PTR_ERR(pdata->vbus_pin[i]);
569 dev_err(&pdev->dev, "unable to claim gpio \"vbus\": %d\n", err);
570 continue;
571 }
572 }
573
574 at91_for_each_port(i) {
575 if (i >= pdata->ports)
576 break;
577
578 pdata->overcurrent_pin[i] =
579 devm_gpiod_get_index_optional(&pdev->dev, "atmel,oc",
580 i, GPIOD_IN);
581 if (!pdata->overcurrent_pin[i])
582 continue;
583 if (IS_ERR(pdata->overcurrent_pin[i])) {
584 err = PTR_ERR(pdata->overcurrent_pin[i]);
585 dev_err(&pdev->dev, "unable to claim gpio \"overcurrent\": %d\n", err);
586 continue;
587 }
588
589 ret = devm_request_irq(&pdev->dev,
590 gpiod_to_irq(pdata->overcurrent_pin[i]),
591 ohci_hcd_at91_overcurrent_irq,
592 IRQF_SHARED,
593 "ohci_overcurrent", pdev);
594 if (ret)
595 dev_info(&pdev->dev, "failed to request gpio \"overcurrent\" IRQ\n");
596 }
597
598 device_init_wakeup(&pdev->dev, 1);
599 return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
600 }
601
ohci_hcd_at91_drv_remove(struct platform_device * pdev)602 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
603 {
604 struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
605 int i;
606
607 if (pdata) {
608 at91_for_each_port(i)
609 ohci_at91_usb_set_power(pdata, i, 0);
610 }
611
612 device_init_wakeup(&pdev->dev, 0);
613 usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
614 return 0;
615 }
616
617 static int __maybe_unused
ohci_hcd_at91_drv_suspend(struct device * dev)618 ohci_hcd_at91_drv_suspend(struct device *dev)
619 {
620 struct usb_hcd *hcd = dev_get_drvdata(dev);
621 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
622 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
623 int ret;
624
625 /*
626 * Disable wakeup if we are going to sleep with slow clock mode
627 * enabled.
628 */
629 ohci_at91->wakeup = device_may_wakeup(dev)
630 && !at91_suspend_entering_slow_clock();
631
632 if (ohci_at91->wakeup)
633 enable_irq_wake(hcd->irq);
634
635 ret = ohci_suspend(hcd, ohci_at91->wakeup);
636 if (ret) {
637 if (ohci_at91->wakeup)
638 disable_irq_wake(hcd->irq);
639 return ret;
640 }
641 /*
642 * The integrated transceivers seem unable to notice disconnect,
643 * reconnect, or wakeup without the 48 MHz clock active. so for
644 * correctness, always discard connection state (using reset).
645 *
646 * REVISIT: some boards will be able to turn VBUS off...
647 */
648 if (!ohci_at91->wakeup) {
649 ohci->rh_state = OHCI_RH_HALTED;
650
651 /* flush the writes */
652 (void) ohci_readl (ohci, &ohci->regs->control);
653 msleep(1);
654 ohci_at91_port_suspend(ohci_at91, 1);
655 at91_stop_clock(ohci_at91);
656 } else {
657 ohci_at91_port_suspend(ohci_at91, 1);
658 }
659
660 return ret;
661 }
662
663 static int __maybe_unused
ohci_hcd_at91_drv_resume(struct device * dev)664 ohci_hcd_at91_drv_resume(struct device *dev)
665 {
666 struct usb_hcd *hcd = dev_get_drvdata(dev);
667 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
668
669 ohci_at91_port_suspend(ohci_at91, 0);
670
671 if (ohci_at91->wakeup)
672 disable_irq_wake(hcd->irq);
673 else
674 at91_start_clock(ohci_at91);
675
676 ohci_resume(hcd, false);
677
678 return 0;
679 }
680
681 static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend,
682 ohci_hcd_at91_drv_resume);
683
684 static struct platform_driver ohci_hcd_at91_driver = {
685 .probe = ohci_hcd_at91_drv_probe,
686 .remove = ohci_hcd_at91_drv_remove,
687 .shutdown = usb_hcd_platform_shutdown,
688 .driver = {
689 .name = "at91_ohci",
690 .pm = &ohci_hcd_at91_pm_ops,
691 .of_match_table = at91_ohci_dt_ids,
692 },
693 };
694
ohci_at91_init(void)695 static int __init ohci_at91_init(void)
696 {
697 if (usb_disabled())
698 return -ENODEV;
699
700 ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides);
701
702 /*
703 * The Atmel HW has some unusual quirks, which require Atmel-specific
704 * workarounds. We override certain hc_driver functions here to
705 * achieve that. We explicitly do not enhance ohci_driver_overrides to
706 * allow this more easily, since this is an unusual case, and we don't
707 * want to encourage others to override these functions by making it
708 * too easy.
709 */
710
711 ohci_at91_hc_driver.hub_status_data = ohci_at91_hub_status_data;
712 ohci_at91_hc_driver.hub_control = ohci_at91_hub_control;
713
714 return platform_driver_register(&ohci_hcd_at91_driver);
715 }
716 module_init(ohci_at91_init);
717
ohci_at91_cleanup(void)718 static void __exit ohci_at91_cleanup(void)
719 {
720 platform_driver_unregister(&ohci_hcd_at91_driver);
721 }
722 module_exit(ohci_at91_cleanup);
723
724 MODULE_DESCRIPTION(DRIVER_DESC);
725 MODULE_LICENSE("GPL");
726 MODULE_ALIAS("platform:at91_ohci");
727
