Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

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

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