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Linux/drivers/usb/host/ohci-at91.c

  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 <mach/hardware.h>
 28 #include <asm/gpio.h>
 29 
 30 #include <mach/cpu.h>
 31 
 32 
 33 #include "ohci.h"
 34 
 35 #define valid_port(index)       ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
 36 #define at91_for_each_port(index)       \
 37                 for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
 38 
 39 /* interface, function and usb clocks; sometimes also an AHB clock */
 40 static struct clk *iclk, *fclk, *uclk, *hclk;
 41 /* interface and function clocks; sometimes also an AHB clock */
 42 
 43 #define DRIVER_DESC "OHCI Atmel driver"
 44 
 45 static const char hcd_name[] = "ohci-atmel";
 46 
 47 static struct hc_driver __read_mostly ohci_at91_hc_driver;
 48 static int clocked;
 49 static int (*orig_ohci_hub_control)(struct usb_hcd  *hcd, u16 typeReq,
 50                         u16 wValue, u16 wIndex, char *buf, u16 wLength);
 51 static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf);
 52 
 53 extern int usb_disabled(void);
 54 
 55 /*-------------------------------------------------------------------------*/
 56 
 57 static void at91_start_clock(void)
 58 {
 59         if (IS_ENABLED(CONFIG_COMMON_CLK)) {
 60                 clk_set_rate(uclk, 48000000);
 61                 clk_prepare_enable(uclk);
 62         }
 63         clk_prepare_enable(hclk);
 64         clk_prepare_enable(iclk);
 65         clk_prepare_enable(fclk);
 66         clocked = 1;
 67 }
 68 
 69 static void at91_stop_clock(void)
 70 {
 71         clk_disable_unprepare(fclk);
 72         clk_disable_unprepare(iclk);
 73         clk_disable_unprepare(hclk);
 74         if (IS_ENABLED(CONFIG_COMMON_CLK))
 75                 clk_disable_unprepare(uclk);
 76         clocked = 0;
 77 }
 78 
 79 static void at91_start_hc(struct platform_device *pdev)
 80 {
 81         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 82         struct ohci_regs __iomem *regs = hcd->regs;
 83 
 84         dev_dbg(&pdev->dev, "start\n");
 85 
 86         /*
 87          * Start the USB clocks.
 88          */
 89         at91_start_clock();
 90 
 91         /*
 92          * The USB host controller must remain in reset.
 93          */
 94         writel(0, &regs->control);
 95 }
 96 
 97 static void at91_stop_hc(struct platform_device *pdev)
 98 {
 99         struct usb_hcd *hcd = platform_get_drvdata(pdev);
100         struct ohci_regs __iomem *regs = hcd->regs;
101 
102         dev_dbg(&pdev->dev, "stop\n");
103 
104         /*
105          * Put the USB host controller into reset.
106          */
107         writel(0, &regs->control);
108 
109         /*
110          * Stop the USB clocks.
111          */
112         at91_stop_clock();
113 }
114 
115 
116 /*-------------------------------------------------------------------------*/
117 
118 static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
119 
120 /* configure so an HC device and id are always provided */
121 /* always called with process context; sleeping is OK */
122 
123 
124 /**
125  * usb_hcd_at91_probe - initialize AT91-based HCDs
126  * Context: !in_interrupt()
127  *
128  * Allocates basic resources for this USB host controller, and
129  * then invokes the start() method for the HCD associated with it
130  * through the hotplug entry's driver_data.
131  */
132 static int usb_hcd_at91_probe(const struct hc_driver *driver,
133                         struct platform_device *pdev)
134 {
135         struct at91_usbh_data *board;
136         struct ohci_hcd *ohci;
137         int retval;
138         struct usb_hcd *hcd = NULL;
139         struct device *dev = &pdev->dev;
140         struct resource *res;
141         int irq;
142 
143         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144         if (!res) {
145                 dev_dbg(dev, "hcd probe: missing memory resource\n");
146                 return -ENXIO;
147         }
148 
149         irq = platform_get_irq(pdev, 0);
150         if (irq < 0) {
151                 dev_dbg(dev, "hcd probe: missing irq resource\n");
152                 return irq;
153         }
154 
155         hcd = usb_create_hcd(driver, dev, "at91");
156         if (!hcd)
157                 return -ENOMEM;
158         hcd->rsrc_start = res->start;
159         hcd->rsrc_len = resource_size(res);
160 
161         hcd->regs = devm_ioremap_resource(dev, res);
162         if (IS_ERR(hcd->regs)) {
163                 retval = PTR_ERR(hcd->regs);
164                 goto err;
165         }
166 
167         iclk = devm_clk_get(dev, "ohci_clk");
168         if (IS_ERR(iclk)) {
169                 dev_err(dev, "failed to get ohci_clk\n");
170                 retval = PTR_ERR(iclk);
171                 goto err;
172         }
173         fclk = devm_clk_get(dev, "uhpck");
174         if (IS_ERR(fclk)) {
175                 dev_err(dev, "failed to get uhpck\n");
176                 retval = PTR_ERR(fclk);
177                 goto err;
178         }
179         hclk = devm_clk_get(dev, "hclk");
180         if (IS_ERR(hclk)) {
181                 dev_err(dev, "failed to get hclk\n");
182                 retval = PTR_ERR(hclk);
183                 goto err;
184         }
185         if (IS_ENABLED(CONFIG_COMMON_CLK)) {
186                 uclk = devm_clk_get(dev, "usb_clk");
187                 if (IS_ERR(uclk)) {
188                         dev_err(dev, "failed to get uclk\n");
189                         retval = PTR_ERR(uclk);
190                         goto err;
191                 }
192         }
193 
194         board = hcd->self.controller->platform_data;
195         ohci = hcd_to_ohci(hcd);
196         ohci->num_ports = board->ports;
197         at91_start_hc(pdev);
198 
199         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
200         if (retval == 0) {
201                 device_wakeup_enable(hcd->self.controller);
202                 return retval;
203         }
204 
205         /* Error handling */
206         at91_stop_hc(pdev);
207 
208  err:
209         usb_put_hcd(hcd);
210         return retval;
211 }
212 
213 
214 /* may be called with controller, bus, and devices active */
215 
216 /**
217  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
218  * @dev: USB Host Controller being removed
219  * Context: !in_interrupt()
220  *
221  * Reverses the effect of usb_hcd_at91_probe(), first invoking
222  * the HCD's stop() method.  It is always called from a thread
223  * context, "rmmod" or something similar.
224  *
225  */
226 static void usb_hcd_at91_remove(struct usb_hcd *hcd,
227                                 struct platform_device *pdev)
228 {
229         usb_remove_hcd(hcd);
230         at91_stop_hc(pdev);
231         usb_put_hcd(hcd);
232 }
233 
234 /*-------------------------------------------------------------------------*/
235 static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
236 {
237         if (!valid_port(port))
238                 return;
239 
240         if (!gpio_is_valid(pdata->vbus_pin[port]))
241                 return;
242 
243         gpio_set_value(pdata->vbus_pin[port],
244                        pdata->vbus_pin_active_low[port] ^ enable);
245 }
246 
247 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
248 {
249         if (!valid_port(port))
250                 return -EINVAL;
251 
252         if (!gpio_is_valid(pdata->vbus_pin[port]))
253                 return -EINVAL;
254 
255         return gpio_get_value(pdata->vbus_pin[port]) ^
256                 pdata->vbus_pin_active_low[port];
257 }
258 
259 /*
260  * Update the status data from the hub with the over-current indicator change.
261  */
262 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
263 {
264         struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
265         int length = orig_ohci_hub_status_data(hcd, buf);
266         int port;
267 
268         at91_for_each_port(port) {
269                 if (pdata->overcurrent_changed[port]) {
270                         if (!length)
271                                 length = 1;
272                         buf[0] |= 1 << (port + 1);
273                 }
274         }
275 
276         return length;
277 }
278 
279 /*
280  * Look at the control requests to the root hub and see if we need to override.
281  */
282 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
283                                  u16 wIndex, char *buf, u16 wLength)
284 {
285         struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
286         struct usb_hub_descriptor *desc;
287         int ret = -EINVAL;
288         u32 *data = (u32 *)buf;
289 
290         dev_dbg(hcd->self.controller,
291                 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
292                 hcd, typeReq, wValue, wIndex, buf, wLength);
293 
294         wIndex--;
295 
296         switch (typeReq) {
297         case SetPortFeature:
298                 if (wValue == USB_PORT_FEAT_POWER) {
299                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
300                         if (valid_port(wIndex)) {
301                                 ohci_at91_usb_set_power(pdata, wIndex, 1);
302                                 ret = 0;
303                         }
304 
305                         goto out;
306                 }
307                 break;
308 
309         case ClearPortFeature:
310                 switch (wValue) {
311                 case USB_PORT_FEAT_C_OVER_CURRENT:
312                         dev_dbg(hcd->self.controller,
313                                 "ClearPortFeature: C_OVER_CURRENT\n");
314 
315                         if (valid_port(wIndex)) {
316                                 pdata->overcurrent_changed[wIndex] = 0;
317                                 pdata->overcurrent_status[wIndex] = 0;
318                         }
319 
320                         goto out;
321 
322                 case USB_PORT_FEAT_OVER_CURRENT:
323                         dev_dbg(hcd->self.controller,
324                                 "ClearPortFeature: OVER_CURRENT\n");
325 
326                         if (valid_port(wIndex))
327                                 pdata->overcurrent_status[wIndex] = 0;
328 
329                         goto out;
330 
331                 case USB_PORT_FEAT_POWER:
332                         dev_dbg(hcd->self.controller,
333                                 "ClearPortFeature: POWER\n");
334 
335                         if (valid_port(wIndex)) {
336                                 ohci_at91_usb_set_power(pdata, wIndex, 0);
337                                 return 0;
338                         }
339                 }
340                 break;
341         }
342 
343         ret = orig_ohci_hub_control(hcd, typeReq, wValue, wIndex + 1,
344                                 buf, wLength);
345         if (ret)
346                 goto out;
347 
348         switch (typeReq) {
349         case GetHubDescriptor:
350 
351                 /* update the hub's descriptor */
352 
353                 desc = (struct usb_hub_descriptor *)buf;
354 
355                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
356                         desc->wHubCharacteristics);
357 
358                 /* remove the old configurations for power-switching, and
359                  * over-current protection, and insert our new configuration
360                  */
361 
362                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
363                 desc->wHubCharacteristics |= cpu_to_le16(0x0001);
364 
365                 if (pdata->overcurrent_supported) {
366                         desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
367                         desc->wHubCharacteristics |=  cpu_to_le16(0x0008|0x0001);
368                 }
369 
370                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
371                         desc->wHubCharacteristics);
372 
373                 return ret;
374 
375         case GetPortStatus:
376                 /* check port status */
377 
378                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
379 
380                 if (valid_port(wIndex)) {
381                         if (!ohci_at91_usb_get_power(pdata, wIndex))
382                                 *data &= ~cpu_to_le32(RH_PS_PPS);
383 
384                         if (pdata->overcurrent_changed[wIndex])
385                                 *data |= cpu_to_le32(RH_PS_OCIC);
386 
387                         if (pdata->overcurrent_status[wIndex])
388                                 *data |= cpu_to_le32(RH_PS_POCI);
389                 }
390         }
391 
392  out:
393         return ret;
394 }
395 
396 /*-------------------------------------------------------------------------*/
397 
398 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
399 {
400         struct platform_device *pdev = data;
401         struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
402         int val, gpio, port;
403 
404         /* From the GPIO notifying the over-current situation, find
405          * out the corresponding port */
406         at91_for_each_port(port) {
407                 if (gpio_is_valid(pdata->overcurrent_pin[port]) &&
408                                 gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
409                         gpio = pdata->overcurrent_pin[port];
410                         break;
411                 }
412         }
413 
414         if (port == AT91_MAX_USBH_PORTS) {
415                 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
416                 return IRQ_HANDLED;
417         }
418 
419         val = gpio_get_value(gpio);
420 
421         /* When notified of an over-current situation, disable power
422            on the corresponding port, and mark this port in
423            over-current. */
424         if (!val) {
425                 ohci_at91_usb_set_power(pdata, port, 0);
426                 pdata->overcurrent_status[port]  = 1;
427                 pdata->overcurrent_changed[port] = 1;
428         }
429 
430         dev_dbg(& pdev->dev, "overcurrent situation %s\n",
431                 val ? "exited" : "notified");
432 
433         return IRQ_HANDLED;
434 }
435 
436 #ifdef CONFIG_OF
437 static const struct of_device_id at91_ohci_dt_ids[] = {
438         { .compatible = "atmel,at91rm9200-ohci" },
439         { /* sentinel */ }
440 };
441 
442 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
443 
444 static int ohci_at91_of_init(struct platform_device *pdev)
445 {
446         struct device_node *np = pdev->dev.of_node;
447         int i, gpio, ret;
448         enum of_gpio_flags flags;
449         struct at91_usbh_data   *pdata;
450         u32 ports;
451 
452         if (!np)
453                 return 0;
454 
455         /* Right now device-tree probed devices don't get dma_mask set.
456          * Since shared usb code relies on it, set it here for now.
457          * Once we have dma capability bindings this can go away.
458          */
459         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
460         if (ret)
461                 return ret;
462 
463         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
464         if (!pdata)
465                 return -ENOMEM;
466 
467         if (!of_property_read_u32(np, "num-ports", &ports))
468                 pdata->ports = ports;
469 
470         at91_for_each_port(i) {
471                 gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
472                 pdata->vbus_pin[i] = gpio;
473                 if (!gpio_is_valid(gpio))
474                         continue;
475                 pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
476         }
477 
478         at91_for_each_port(i)
479                 pdata->overcurrent_pin[i] =
480                         of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
481 
482         pdev->dev.platform_data = pdata;
483 
484         return 0;
485 }
486 #else
487 static int ohci_at91_of_init(struct platform_device *pdev)
488 {
489         return 0;
490 }
491 #endif
492 
493 /*-------------------------------------------------------------------------*/
494 
495 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
496 {
497         struct at91_usbh_data   *pdata;
498         int                     i;
499         int                     gpio;
500         int                     ret;
501 
502         ret = ohci_at91_of_init(pdev);
503         if (ret)
504                 return ret;
505 
506         pdata = dev_get_platdata(&pdev->dev);
507 
508         if (pdata) {
509                 at91_for_each_port(i) {
510                         /*
511                          * do not configure PIO if not in relation with
512                          * real USB port on board
513                          */
514                         if (i >= pdata->ports) {
515                                 pdata->vbus_pin[i] = -EINVAL;
516                                 pdata->overcurrent_pin[i] = -EINVAL;
517                                 break;
518                         }
519 
520                         if (!gpio_is_valid(pdata->vbus_pin[i]))
521                                 continue;
522                         gpio = pdata->vbus_pin[i];
523 
524                         ret = gpio_request(gpio, "ohci_vbus");
525                         if (ret) {
526                                 dev_err(&pdev->dev,
527                                         "can't request vbus gpio %d\n", gpio);
528                                 continue;
529                         }
530                         ret = gpio_direction_output(gpio,
531                                                 !pdata->vbus_pin_active_low[i]);
532                         if (ret) {
533                                 dev_err(&pdev->dev,
534                                         "can't put vbus gpio %d as output %d\n",
535                                         gpio, !pdata->vbus_pin_active_low[i]);
536                                 gpio_free(gpio);
537                                 continue;
538                         }
539 
540                         ohci_at91_usb_set_power(pdata, i, 1);
541                 }
542 
543                 at91_for_each_port(i) {
544                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
545                                 continue;
546                         gpio = pdata->overcurrent_pin[i];
547 
548                         ret = gpio_request(gpio, "ohci_overcurrent");
549                         if (ret) {
550                                 dev_err(&pdev->dev,
551                                         "can't request overcurrent gpio %d\n",
552                                         gpio);
553                                 continue;
554                         }
555 
556                         ret = gpio_direction_input(gpio);
557                         if (ret) {
558                                 dev_err(&pdev->dev,
559                                         "can't configure overcurrent gpio %d as input\n",
560                                         gpio);
561                                 gpio_free(gpio);
562                                 continue;
563                         }
564 
565                         ret = request_irq(gpio_to_irq(gpio),
566                                           ohci_hcd_at91_overcurrent_irq,
567                                           IRQF_SHARED, "ohci_overcurrent", pdev);
568                         if (ret) {
569                                 gpio_free(gpio);
570                                 dev_err(&pdev->dev,
571                                         "can't get gpio IRQ for overcurrent\n");
572                         }
573                 }
574         }
575 
576         device_init_wakeup(&pdev->dev, 1);
577         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
578 }
579 
580 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
581 {
582         struct at91_usbh_data   *pdata = dev_get_platdata(&pdev->dev);
583         int                     i;
584 
585         if (pdata) {
586                 at91_for_each_port(i) {
587                         if (!gpio_is_valid(pdata->vbus_pin[i]))
588                                 continue;
589                         ohci_at91_usb_set_power(pdata, i, 0);
590                         gpio_free(pdata->vbus_pin[i]);
591                 }
592 
593                 at91_for_each_port(i) {
594                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
595                                 continue;
596                         free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
597                         gpio_free(pdata->overcurrent_pin[i]);
598                 }
599         }
600 
601         device_init_wakeup(&pdev->dev, 0);
602         usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
603         return 0;
604 }
605 
606 #ifdef CONFIG_PM
607 
608 static int
609 ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
610 {
611         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
612         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
613         bool            do_wakeup = device_may_wakeup(&pdev->dev);
614         int             ret;
615 
616         if (do_wakeup)
617                 enable_irq_wake(hcd->irq);
618 
619         ret = ohci_suspend(hcd, do_wakeup);
620         if (ret) {
621                 disable_irq_wake(hcd->irq);
622                 return ret;
623         }
624         /*
625          * The integrated transceivers seem unable to notice disconnect,
626          * reconnect, or wakeup without the 48 MHz clock active.  so for
627          * correctness, always discard connection state (using reset).
628          *
629          * REVISIT: some boards will be able to turn VBUS off...
630          */
631         if (at91_suspend_entering_slow_clock()) {
632                 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
633                 ohci->hc_control &= OHCI_CTRL_RWC;
634                 ohci_writel(ohci, ohci->hc_control, &ohci->regs->control);
635                 ohci->rh_state = OHCI_RH_HALTED;
636 
637                 /* flush the writes */
638                 (void) ohci_readl (ohci, &ohci->regs->control);
639                 at91_stop_clock();
640         }
641 
642         return ret;
643 }
644 
645 static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
646 {
647         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
648 
649         if (device_may_wakeup(&pdev->dev))
650                 disable_irq_wake(hcd->irq);
651 
652         if (!clocked)
653                 at91_start_clock();
654 
655         ohci_resume(hcd, false);
656         return 0;
657 }
658 #else
659 #define ohci_hcd_at91_drv_suspend NULL
660 #define ohci_hcd_at91_drv_resume  NULL
661 #endif
662 
663 static struct platform_driver ohci_hcd_at91_driver = {
664         .probe          = ohci_hcd_at91_drv_probe,
665         .remove         = ohci_hcd_at91_drv_remove,
666         .shutdown       = usb_hcd_platform_shutdown,
667         .suspend        = ohci_hcd_at91_drv_suspend,
668         .resume         = ohci_hcd_at91_drv_resume,
669         .driver         = {
670                 .name   = "at91_ohci",
671                 .owner  = THIS_MODULE,
672                 .of_match_table = of_match_ptr(at91_ohci_dt_ids),
673         },
674 };
675 
676 static int __init ohci_at91_init(void)
677 {
678         if (usb_disabled())
679                 return -ENODEV;
680 
681         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
682         ohci_init_driver(&ohci_at91_hc_driver, NULL);
683 
684         /*
685          * The Atmel HW has some unusual quirks, which require Atmel-specific
686          * workarounds. We override certain hc_driver functions here to
687          * achieve that. We explicitly do not enhance ohci_driver_overrides to
688          * allow this more easily, since this is an unusual case, and we don't
689          * want to encourage others to override these functions by making it
690          * too easy.
691          */
692 
693         orig_ohci_hub_control = ohci_at91_hc_driver.hub_control;
694         orig_ohci_hub_status_data = ohci_at91_hc_driver.hub_status_data;
695 
696         ohci_at91_hc_driver.hub_status_data     = ohci_at91_hub_status_data;
697         ohci_at91_hc_driver.hub_control         = ohci_at91_hub_control;
698 
699         return platform_driver_register(&ohci_hcd_at91_driver);
700 }
701 module_init(ohci_at91_init);
702 
703 static void __exit ohci_at91_cleanup(void)
704 {
705         platform_driver_unregister(&ohci_hcd_at91_driver);
706 }
707 module_exit(ohci_at91_cleanup);
708 
709 MODULE_DESCRIPTION(DRIVER_DESC);
710 MODULE_LICENSE("GPL");
711 MODULE_ALIAS("platform:at91_ohci");
712 

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