xref: /openbmc/linux/drivers/usb/host/ohci-at91.c (revision 92a2c6b2)
1 /*
2  * OHCI HCD (Host Controller Driver) for USB.
3  *
4  *  Copyright (C) 2004 SAN People (Pty) Ltd.
5  *  Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
6  *
7  * AT91 Bus Glue
8  *
9  * Based on fragments of 2.4 driver by Rick Bronson.
10  * Based on ohci-omap.c
11  *
12  * This file is licenced under the GPL.
13  */
14 
15 #include <linux/clk.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/of_platform.h>
18 #include <linux/of_gpio.h>
19 #include <linux/platform_device.h>
20 #include <linux/platform_data/atmel.h>
21 #include <linux/io.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/usb.h>
25 #include <linux/usb/hcd.h>
26 
27 #include <asm/gpio.h>
28 
29 #include "ohci.h"
30 
31 #define valid_port(index)	((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
32 #define at91_for_each_port(index)	\
33 		for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
34 
35 /* interface, function and usb clocks; sometimes also an AHB clock */
36 #define hcd_to_ohci_at91_priv(h) \
37 	((struct ohci_at91_priv *)hcd_to_ohci(h)->priv)
38 
39 struct ohci_at91_priv {
40 	struct clk *iclk;
41 	struct clk *fclk;
42 	struct clk *uclk;
43 	struct clk *hclk;
44 	bool clocked;
45 	bool wakeup;		/* Saved wake-up state for resume */
46 };
47 /* interface and function clocks; sometimes also an AHB clock */
48 
49 #define DRIVER_DESC "OHCI Atmel driver"
50 
51 static const char hcd_name[] = "ohci-atmel";
52 
53 static struct hc_driver __read_mostly ohci_at91_hc_driver;
54 
55 static const struct ohci_driver_overrides ohci_at91_drv_overrides __initconst = {
56 	.extra_priv_size = sizeof(struct ohci_at91_priv),
57 };
58 
59 extern int usb_disabled(void);
60 
61 /*-------------------------------------------------------------------------*/
62 
63 static void at91_start_clock(struct ohci_at91_priv *ohci_at91)
64 {
65 	if (ohci_at91->clocked)
66 		return;
67 	if (IS_ENABLED(CONFIG_COMMON_CLK)) {
68 		clk_set_rate(ohci_at91->uclk, 48000000);
69 		clk_prepare_enable(ohci_at91->uclk);
70 	}
71 	clk_prepare_enable(ohci_at91->hclk);
72 	clk_prepare_enable(ohci_at91->iclk);
73 	clk_prepare_enable(ohci_at91->fclk);
74 	ohci_at91->clocked = true;
75 }
76 
77 static void at91_stop_clock(struct ohci_at91_priv *ohci_at91)
78 {
79 	if (!ohci_at91->clocked)
80 		return;
81 	clk_disable_unprepare(ohci_at91->fclk);
82 	clk_disable_unprepare(ohci_at91->iclk);
83 	clk_disable_unprepare(ohci_at91->hclk);
84 	if (IS_ENABLED(CONFIG_COMMON_CLK))
85 		clk_disable_unprepare(ohci_at91->uclk);
86 	ohci_at91->clocked = false;
87 }
88 
89 static void at91_start_hc(struct platform_device *pdev)
90 {
91 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
92 	struct ohci_regs __iomem *regs = hcd->regs;
93 	struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
94 
95 	dev_dbg(&pdev->dev, "start\n");
96 
97 	/*
98 	 * Start the USB clocks.
99 	 */
100 	at91_start_clock(ohci_at91);
101 
102 	/*
103 	 * The USB host controller must remain in reset.
104 	 */
105 	writel(0, &regs->control);
106 }
107 
108 static void at91_stop_hc(struct platform_device *pdev)
109 {
110 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
111 	struct ohci_regs __iomem *regs = hcd->regs;
112 	struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
113 
114 	dev_dbg(&pdev->dev, "stop\n");
115 
116 	/*
117 	 * Put the USB host controller into reset.
118 	 */
119 	writel(0, &regs->control);
120 
121 	/*
122 	 * Stop the USB clocks.
123 	 */
124 	at91_stop_clock(ohci_at91);
125 }
126 
127 
128 /*-------------------------------------------------------------------------*/
129 
130 static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
131 
132 /* configure so an HC device and id are always provided */
133 /* always called with process context; sleeping is OK */
134 
135 
136 /**
137  * usb_hcd_at91_probe - initialize AT91-based HCDs
138  * Context: !in_interrupt()
139  *
140  * Allocates basic resources for this USB host controller, and
141  * then invokes the start() method for the HCD associated with it
142  * through the hotplug entry's driver_data.
143  */
144 static int usb_hcd_at91_probe(const struct hc_driver *driver,
145 			struct platform_device *pdev)
146 {
147 	struct at91_usbh_data *board;
148 	struct ohci_hcd *ohci;
149 	int retval;
150 	struct usb_hcd *hcd;
151 	struct ohci_at91_priv *ohci_at91;
152 	struct device *dev = &pdev->dev;
153 	struct resource *res;
154 	int irq;
155 
156 	irq = platform_get_irq(pdev, 0);
157 	if (irq < 0) {
158 		dev_dbg(dev, "hcd probe: missing irq resource\n");
159 		return irq;
160 	}
161 
162 	hcd = usb_create_hcd(driver, dev, "at91");
163 	if (!hcd)
164 		return -ENOMEM;
165 	ohci_at91 = hcd_to_ohci_at91_priv(hcd);
166 
167 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
168 	hcd->regs = devm_ioremap_resource(dev, res);
169 	if (IS_ERR(hcd->regs)) {
170 		retval = PTR_ERR(hcd->regs);
171 		goto err;
172 	}
173 	hcd->rsrc_start = res->start;
174 	hcd->rsrc_len = resource_size(res);
175 
176 	ohci_at91->iclk = devm_clk_get(dev, "ohci_clk");
177 	if (IS_ERR(ohci_at91->iclk)) {
178 		dev_err(dev, "failed to get ohci_clk\n");
179 		retval = PTR_ERR(ohci_at91->iclk);
180 		goto err;
181 	}
182 	ohci_at91->fclk = devm_clk_get(dev, "uhpck");
183 	if (IS_ERR(ohci_at91->fclk)) {
184 		dev_err(dev, "failed to get uhpck\n");
185 		retval = PTR_ERR(ohci_at91->fclk);
186 		goto err;
187 	}
188 	ohci_at91->hclk = devm_clk_get(dev, "hclk");
189 	if (IS_ERR(ohci_at91->hclk)) {
190 		dev_err(dev, "failed to get hclk\n");
191 		retval = PTR_ERR(ohci_at91->hclk);
192 		goto err;
193 	}
194 	if (IS_ENABLED(CONFIG_COMMON_CLK)) {
195 		ohci_at91->uclk = devm_clk_get(dev, "usb_clk");
196 		if (IS_ERR(ohci_at91->uclk)) {
197 			dev_err(dev, "failed to get uclk\n");
198 			retval = PTR_ERR(ohci_at91->uclk);
199 			goto err;
200 		}
201 	}
202 
203 	board = hcd->self.controller->platform_data;
204 	ohci = hcd_to_ohci(hcd);
205 	ohci->num_ports = board->ports;
206 	at91_start_hc(pdev);
207 
208 	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
209 	if (retval == 0) {
210 		device_wakeup_enable(hcd->self.controller);
211 		return retval;
212 	}
213 
214 	/* Error handling */
215 	at91_stop_hc(pdev);
216 
217  err:
218 	usb_put_hcd(hcd);
219 	return retval;
220 }
221 
222 
223 /* may be called with controller, bus, and devices active */
224 
225 /**
226  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
227  * @dev: USB Host Controller being removed
228  * Context: !in_interrupt()
229  *
230  * Reverses the effect of usb_hcd_at91_probe(), first invoking
231  * the HCD's stop() method.  It is always called from a thread
232  * context, "rmmod" or something similar.
233  *
234  */
235 static void usb_hcd_at91_remove(struct usb_hcd *hcd,
236 				struct platform_device *pdev)
237 {
238 	usb_remove_hcd(hcd);
239 	at91_stop_hc(pdev);
240 	usb_put_hcd(hcd);
241 }
242 
243 /*-------------------------------------------------------------------------*/
244 static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
245 {
246 	if (!valid_port(port))
247 		return;
248 
249 	if (!gpio_is_valid(pdata->vbus_pin[port]))
250 		return;
251 
252 	gpio_set_value(pdata->vbus_pin[port],
253 		       pdata->vbus_pin_active_low[port] ^ enable);
254 }
255 
256 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
257 {
258 	if (!valid_port(port))
259 		return -EINVAL;
260 
261 	if (!gpio_is_valid(pdata->vbus_pin[port]))
262 		return -EINVAL;
263 
264 	return gpio_get_value(pdata->vbus_pin[port]) ^
265 		pdata->vbus_pin_active_low[port];
266 }
267 
268 /*
269  * Update the status data from the hub with the over-current indicator change.
270  */
271 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
272 {
273 	struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
274 	int length = ohci_hub_status_data(hcd, buf);
275 	int port;
276 
277 	at91_for_each_port(port) {
278 		if (pdata->overcurrent_changed[port]) {
279 			if (!length)
280 				length = 1;
281 			buf[0] |= 1 << (port + 1);
282 		}
283 	}
284 
285 	return length;
286 }
287 
288 /*
289  * Look at the control requests to the root hub and see if we need to override.
290  */
291 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
292 				 u16 wIndex, char *buf, u16 wLength)
293 {
294 	struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
295 	struct usb_hub_descriptor *desc;
296 	int ret = -EINVAL;
297 	u32 *data = (u32 *)buf;
298 
299 	dev_dbg(hcd->self.controller,
300 		"ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
301 		hcd, typeReq, wValue, wIndex, buf, wLength);
302 
303 	wIndex--;
304 
305 	switch (typeReq) {
306 	case SetPortFeature:
307 		if (wValue == USB_PORT_FEAT_POWER) {
308 			dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
309 			if (valid_port(wIndex)) {
310 				ohci_at91_usb_set_power(pdata, wIndex, 1);
311 				ret = 0;
312 			}
313 
314 			goto out;
315 		}
316 		break;
317 
318 	case ClearPortFeature:
319 		switch (wValue) {
320 		case USB_PORT_FEAT_C_OVER_CURRENT:
321 			dev_dbg(hcd->self.controller,
322 				"ClearPortFeature: C_OVER_CURRENT\n");
323 
324 			if (valid_port(wIndex)) {
325 				pdata->overcurrent_changed[wIndex] = 0;
326 				pdata->overcurrent_status[wIndex] = 0;
327 			}
328 
329 			goto out;
330 
331 		case USB_PORT_FEAT_OVER_CURRENT:
332 			dev_dbg(hcd->self.controller,
333 				"ClearPortFeature: OVER_CURRENT\n");
334 
335 			if (valid_port(wIndex))
336 				pdata->overcurrent_status[wIndex] = 0;
337 
338 			goto out;
339 
340 		case USB_PORT_FEAT_POWER:
341 			dev_dbg(hcd->self.controller,
342 				"ClearPortFeature: POWER\n");
343 
344 			if (valid_port(wIndex)) {
345 				ohci_at91_usb_set_power(pdata, wIndex, 0);
346 				return 0;
347 			}
348 		}
349 		break;
350 	}
351 
352 	ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
353 	if (ret)
354 		goto out;
355 
356 	switch (typeReq) {
357 	case GetHubDescriptor:
358 
359 		/* update the hub's descriptor */
360 
361 		desc = (struct usb_hub_descriptor *)buf;
362 
363 		dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
364 			desc->wHubCharacteristics);
365 
366 		/* remove the old configurations for power-switching, and
367 		 * over-current protection, and insert our new configuration
368 		 */
369 
370 		desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
371 		desc->wHubCharacteristics |=
372 			cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM);
373 
374 		if (pdata->overcurrent_supported) {
375 			desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
376 			desc->wHubCharacteristics |=
377 				cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM);
378 		}
379 
380 		dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
381 			desc->wHubCharacteristics);
382 
383 		return ret;
384 
385 	case GetPortStatus:
386 		/* check port status */
387 
388 		dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
389 
390 		if (valid_port(wIndex)) {
391 			if (!ohci_at91_usb_get_power(pdata, wIndex))
392 				*data &= ~cpu_to_le32(RH_PS_PPS);
393 
394 			if (pdata->overcurrent_changed[wIndex])
395 				*data |= cpu_to_le32(RH_PS_OCIC);
396 
397 			if (pdata->overcurrent_status[wIndex])
398 				*data |= cpu_to_le32(RH_PS_POCI);
399 		}
400 	}
401 
402  out:
403 	return ret;
404 }
405 
406 /*-------------------------------------------------------------------------*/
407 
408 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
409 {
410 	struct platform_device *pdev = data;
411 	struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
412 	int val, gpio, port;
413 
414 	/* From the GPIO notifying the over-current situation, find
415 	 * out the corresponding port */
416 	at91_for_each_port(port) {
417 		if (gpio_is_valid(pdata->overcurrent_pin[port]) &&
418 				gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
419 			gpio = pdata->overcurrent_pin[port];
420 			break;
421 		}
422 	}
423 
424 	if (port == AT91_MAX_USBH_PORTS) {
425 		dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
426 		return IRQ_HANDLED;
427 	}
428 
429 	val = gpio_get_value(gpio);
430 
431 	/* When notified of an over-current situation, disable power
432 	   on the corresponding port, and mark this port in
433 	   over-current. */
434 	if (!val) {
435 		ohci_at91_usb_set_power(pdata, port, 0);
436 		pdata->overcurrent_status[port]  = 1;
437 		pdata->overcurrent_changed[port] = 1;
438 	}
439 
440 	dev_dbg(& pdev->dev, "overcurrent situation %s\n",
441 		val ? "exited" : "notified");
442 
443 	return IRQ_HANDLED;
444 }
445 
446 #ifdef CONFIG_OF
447 static const struct of_device_id at91_ohci_dt_ids[] = {
448 	{ .compatible = "atmel,at91rm9200-ohci" },
449 	{ /* sentinel */ }
450 };
451 
452 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
453 
454 static int ohci_at91_of_init(struct platform_device *pdev)
455 {
456 	struct device_node *np = pdev->dev.of_node;
457 	int i, gpio, ret;
458 	enum of_gpio_flags flags;
459 	struct at91_usbh_data	*pdata;
460 	u32 ports;
461 
462 	if (!np)
463 		return 0;
464 
465 	/* Right now device-tree probed devices don't get dma_mask set.
466 	 * Since shared usb code relies on it, set it here for now.
467 	 * Once we have dma capability bindings this can go away.
468 	 */
469 	ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
470 	if (ret)
471 		return ret;
472 
473 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
474 	if (!pdata)
475 		return -ENOMEM;
476 
477 	if (!of_property_read_u32(np, "num-ports", &ports))
478 		pdata->ports = ports;
479 
480 	at91_for_each_port(i) {
481 		gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
482 		pdata->vbus_pin[i] = gpio;
483 		if (!gpio_is_valid(gpio))
484 			continue;
485 		pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
486 	}
487 
488 	at91_for_each_port(i)
489 		pdata->overcurrent_pin[i] =
490 			of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
491 
492 	pdev->dev.platform_data = pdata;
493 
494 	return 0;
495 }
496 #else
497 static int ohci_at91_of_init(struct platform_device *pdev)
498 {
499 	return 0;
500 }
501 #endif
502 
503 /*-------------------------------------------------------------------------*/
504 
505 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
506 {
507 	struct at91_usbh_data	*pdata;
508 	int			i;
509 	int			gpio;
510 	int			ret;
511 
512 	ret = ohci_at91_of_init(pdev);
513 	if (ret)
514 		return ret;
515 
516 	pdata = dev_get_platdata(&pdev->dev);
517 
518 	if (pdata) {
519 		at91_for_each_port(i) {
520 			/*
521 			 * do not configure PIO if not in relation with
522 			 * real USB port on board
523 			 */
524 			if (i >= pdata->ports) {
525 				pdata->vbus_pin[i] = -EINVAL;
526 				pdata->overcurrent_pin[i] = -EINVAL;
527 				break;
528 			}
529 
530 			if (!gpio_is_valid(pdata->vbus_pin[i]))
531 				continue;
532 			gpio = pdata->vbus_pin[i];
533 
534 			ret = gpio_request(gpio, "ohci_vbus");
535 			if (ret) {
536 				dev_err(&pdev->dev,
537 					"can't request vbus gpio %d\n", gpio);
538 				continue;
539 			}
540 			ret = gpio_direction_output(gpio,
541 						!pdata->vbus_pin_active_low[i]);
542 			if (ret) {
543 				dev_err(&pdev->dev,
544 					"can't put vbus gpio %d as output %d\n",
545 					gpio, !pdata->vbus_pin_active_low[i]);
546 				gpio_free(gpio);
547 				continue;
548 			}
549 
550 			ohci_at91_usb_set_power(pdata, i, 1);
551 		}
552 
553 		at91_for_each_port(i) {
554 			if (!gpio_is_valid(pdata->overcurrent_pin[i]))
555 				continue;
556 			gpio = pdata->overcurrent_pin[i];
557 
558 			ret = gpio_request(gpio, "ohci_overcurrent");
559 			if (ret) {
560 				dev_err(&pdev->dev,
561 					"can't request overcurrent gpio %d\n",
562 					gpio);
563 				continue;
564 			}
565 
566 			ret = gpio_direction_input(gpio);
567 			if (ret) {
568 				dev_err(&pdev->dev,
569 					"can't configure overcurrent gpio %d as input\n",
570 					gpio);
571 				gpio_free(gpio);
572 				continue;
573 			}
574 
575 			ret = request_irq(gpio_to_irq(gpio),
576 					  ohci_hcd_at91_overcurrent_irq,
577 					  IRQF_SHARED, "ohci_overcurrent", pdev);
578 			if (ret) {
579 				gpio_free(gpio);
580 				dev_err(&pdev->dev,
581 					"can't get gpio IRQ for overcurrent\n");
582 			}
583 		}
584 	}
585 
586 	device_init_wakeup(&pdev->dev, 1);
587 	return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
588 }
589 
590 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
591 {
592 	struct at91_usbh_data	*pdata = dev_get_platdata(&pdev->dev);
593 	int			i;
594 
595 	if (pdata) {
596 		at91_for_each_port(i) {
597 			if (!gpio_is_valid(pdata->vbus_pin[i]))
598 				continue;
599 			ohci_at91_usb_set_power(pdata, i, 0);
600 			gpio_free(pdata->vbus_pin[i]);
601 		}
602 
603 		at91_for_each_port(i) {
604 			if (!gpio_is_valid(pdata->overcurrent_pin[i]))
605 				continue;
606 			free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
607 			gpio_free(pdata->overcurrent_pin[i]);
608 		}
609 	}
610 
611 	device_init_wakeup(&pdev->dev, 0);
612 	usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
613 	return 0;
614 }
615 
616 #ifdef CONFIG_PM
617 
618 static int
619 ohci_hcd_at91_drv_suspend(struct device *dev)
620 {
621 	struct usb_hcd	*hcd = dev_get_drvdata(dev);
622 	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
623 	struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
624 	int		ret;
625 
626 	/*
627 	 * Disable wakeup if we are going to sleep with slow clock mode
628 	 * enabled.
629 	 */
630 	ohci_at91->wakeup = device_may_wakeup(dev)
631 			&& !at91_suspend_entering_slow_clock();
632 
633 	if (ohci_at91->wakeup)
634 		enable_irq_wake(hcd->irq);
635 
636 	ret = ohci_suspend(hcd, ohci_at91->wakeup);
637 	if (ret) {
638 		if (ohci_at91->wakeup)
639 			disable_irq_wake(hcd->irq);
640 		return ret;
641 	}
642 	/*
643 	 * The integrated transceivers seem unable to notice disconnect,
644 	 * reconnect, or wakeup without the 48 MHz clock active.  so for
645 	 * correctness, always discard connection state (using reset).
646 	 *
647 	 * REVISIT: some boards will be able to turn VBUS off...
648 	 */
649 	if (!ohci_at91->wakeup) {
650 		ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
651 		ohci->hc_control &= OHCI_CTRL_RWC;
652 		ohci_writel(ohci, ohci->hc_control, &ohci->regs->control);
653 		ohci->rh_state = OHCI_RH_HALTED;
654 
655 		/* flush the writes */
656 		(void) ohci_readl (ohci, &ohci->regs->control);
657 		at91_stop_clock(ohci_at91);
658 	}
659 
660 	return ret;
661 }
662 
663 static int ohci_hcd_at91_drv_resume(struct device *dev)
664 {
665 	struct usb_hcd	*hcd = dev_get_drvdata(dev);
666 	struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
667 
668 	if (ohci_at91->wakeup)
669 		disable_irq_wake(hcd->irq);
670 
671 	at91_start_clock(ohci_at91);
672 
673 	ohci_resume(hcd, false);
674 	return 0;
675 }
676 #endif
677 
678 static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend,
679 					ohci_hcd_at91_drv_resume);
680 
681 static struct platform_driver ohci_hcd_at91_driver = {
682 	.probe		= ohci_hcd_at91_drv_probe,
683 	.remove		= ohci_hcd_at91_drv_remove,
684 	.shutdown	= usb_hcd_platform_shutdown,
685 	.driver		= {
686 		.name	= "at91_ohci",
687 		.pm	= &ohci_hcd_at91_pm_ops,
688 		.of_match_table	= of_match_ptr(at91_ohci_dt_ids),
689 	},
690 };
691 
692 static int __init ohci_at91_init(void)
693 {
694 	if (usb_disabled())
695 		return -ENODEV;
696 
697 	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
698 	ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides);
699 
700 	/*
701 	 * The Atmel HW has some unusual quirks, which require Atmel-specific
702 	 * workarounds. We override certain hc_driver functions here to
703 	 * achieve that. We explicitly do not enhance ohci_driver_overrides to
704 	 * allow this more easily, since this is an unusual case, and we don't
705 	 * want to encourage others to override these functions by making it
706 	 * too easy.
707 	 */
708 
709 	ohci_at91_hc_driver.hub_status_data	= ohci_at91_hub_status_data;
710 	ohci_at91_hc_driver.hub_control		= ohci_at91_hub_control;
711 
712 	return platform_driver_register(&ohci_hcd_at91_driver);
713 }
714 module_init(ohci_at91_init);
715 
716 static void __exit ohci_at91_cleanup(void)
717 {
718 	platform_driver_unregister(&ohci_hcd_at91_driver);
719 }
720 module_exit(ohci_at91_cleanup);
721 
722 MODULE_DESCRIPTION(DRIVER_DESC);
723 MODULE_LICENSE("GPL");
724 MODULE_ALIAS("platform:at91_ohci");
725