Version:  2.0.40 2.2.26 2.4.37 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 4.7 4.8 4.9 4.10

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

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