]> Git Repo - linux.git/blob - drivers/usb/host/ohci-at91.c
Merge tag 'cxl-for-6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
[linux.git] / drivers / usb / host / ohci-at91.c
1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3  * OHCI HCD (Host Controller Driver) for USB.
4  *
5  *  Copyright (C) 2004 SAN People (Pty) Ltd.
6  *  Copyright (C) 2005 Thibaut VARENE <[email protected]>
7  *
8  * AT91 Bus Glue
9  *
10  * Based on fragments of 2.4 driver by Rick Bronson.
11  * Based on ohci-omap.c
12  *
13  * This file is licenced under the GPL.
14  */
15
16 #include <linux/arm-smccc.h>
17 #include <linux/clk.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/gpio/consumer.h>
20 #include <linux/of_platform.h>
21 #include <linux/platform_device.h>
22 #include <linux/platform_data/atmel.h>
23 #include <linux/io.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/mfd/syscon.h>
27 #include <linux/regmap.h>
28 #include <linux/usb.h>
29 #include <linux/usb/hcd.h>
30 #include <soc/at91/atmel-sfr.h>
31
32 #include "ohci.h"
33
34 #define valid_port(index)       ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
35 #define at91_for_each_port(index)       \
36                 for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
37
38 /* interface, function and usb clocks; sometimes also an AHB clock */
39 #define hcd_to_ohci_at91_priv(h) \
40         ((struct ohci_at91_priv *)hcd_to_ohci(h)->priv)
41
42 #define AT91_MAX_USBH_PORTS     3
43 struct at91_usbh_data {
44         struct gpio_desc *vbus_pin[AT91_MAX_USBH_PORTS];
45         struct gpio_desc *overcurrent_pin[AT91_MAX_USBH_PORTS];
46         u8 ports;                               /* number of ports on root hub */
47         u8 overcurrent_supported;
48         u8 overcurrent_status[AT91_MAX_USBH_PORTS];
49         u8 overcurrent_changed[AT91_MAX_USBH_PORTS];
50 };
51
52 struct ohci_at91_priv {
53         struct clk *iclk;
54         struct clk *fclk;
55         struct clk *hclk;
56         bool clocked;
57         bool wakeup;            /* Saved wake-up state for resume */
58         struct regmap *sfr_regmap;
59         u32 suspend_smc_id;
60 };
61 /* interface and function clocks; sometimes also an AHB clock */
62
63 #define DRIVER_DESC "OHCI Atmel driver"
64
65 static const char hcd_name[] = "ohci-atmel";
66
67 static struct hc_driver __read_mostly ohci_at91_hc_driver;
68
69 static const struct ohci_driver_overrides ohci_at91_drv_overrides __initconst = {
70         .extra_priv_size = sizeof(struct ohci_at91_priv),
71 };
72
73 /*-------------------------------------------------------------------------*/
74
75 static void at91_start_clock(struct ohci_at91_priv *ohci_at91)
76 {
77         if (ohci_at91->clocked)
78                 return;
79
80         clk_set_rate(ohci_at91->fclk, 48000000);
81         clk_prepare_enable(ohci_at91->hclk);
82         clk_prepare_enable(ohci_at91->iclk);
83         clk_prepare_enable(ohci_at91->fclk);
84         ohci_at91->clocked = true;
85 }
86
87 static void at91_stop_clock(struct ohci_at91_priv *ohci_at91)
88 {
89         if (!ohci_at91->clocked)
90                 return;
91
92         clk_disable_unprepare(ohci_at91->fclk);
93         clk_disable_unprepare(ohci_at91->iclk);
94         clk_disable_unprepare(ohci_at91->hclk);
95         ohci_at91->clocked = false;
96 }
97
98 static void at91_start_hc(struct platform_device *pdev)
99 {
100         struct usb_hcd *hcd = platform_get_drvdata(pdev);
101         struct ohci_regs __iomem *regs = hcd->regs;
102         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
103
104         dev_dbg(&pdev->dev, "start\n");
105
106         /*
107          * Start the USB clocks.
108          */
109         at91_start_clock(ohci_at91);
110
111         /*
112          * The USB host controller must remain in reset.
113          */
114         writel(0, &regs->control);
115 }
116
117 static void at91_stop_hc(struct platform_device *pdev)
118 {
119         struct usb_hcd *hcd = platform_get_drvdata(pdev);
120         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
121
122         dev_dbg(&pdev->dev, "stop\n");
123
124         /*
125          * Put the USB host controller into reset.
126          */
127         usb_hcd_platform_shutdown(pdev);
128
129         /*
130          * Stop the USB clocks.
131          */
132         at91_stop_clock(ohci_at91);
133 }
134
135
136 /*-------------------------------------------------------------------------*/
137
138 static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
139
140 static u32 at91_dt_suspend_smc(struct device *dev)
141 {
142         u32 suspend_smc_id;
143
144         if (!dev->of_node)
145                 return 0;
146
147         if (of_property_read_u32(dev->of_node, "microchip,suspend-smc-id", &suspend_smc_id))
148                 return 0;
149
150         return suspend_smc_id;
151 }
152
153 static struct regmap *at91_dt_syscon_sfr(void)
154 {
155         struct regmap *regmap;
156
157         regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-sfr");
158         if (IS_ERR(regmap)) {
159                 regmap = syscon_regmap_lookup_by_compatible("microchip,sam9x60-sfr");
160                 if (IS_ERR(regmap))
161                         regmap = NULL;
162         }
163
164         return regmap;
165 }
166
167 /* configure so an HC device and id are always provided */
168 /* always called with process context; sleeping is OK */
169
170
171 /*
172  * usb_hcd_at91_probe - initialize AT91-based HCDs
173  * @driver:     Pointer to hc driver instance
174  * @pdev:       USB controller to probe
175  *
176  * Context: task context, might sleep
177  *
178  * Allocates basic resources for this USB host controller, and
179  * then invokes the start() method for the HCD associated with it
180  * through the hotplug entry's driver_data.
181  */
182 static int usb_hcd_at91_probe(const struct hc_driver *driver,
183                         struct platform_device *pdev)
184 {
185         struct at91_usbh_data *board;
186         struct ohci_hcd *ohci;
187         int retval;
188         struct usb_hcd *hcd;
189         struct ohci_at91_priv *ohci_at91;
190         struct device *dev = &pdev->dev;
191         struct resource *res;
192         int irq;
193
194         irq = platform_get_irq(pdev, 0);
195         if (irq < 0) {
196                 dev_dbg(dev, "hcd probe: missing irq resource\n");
197                 return irq;
198         }
199
200         hcd = usb_create_hcd(driver, dev, "at91");
201         if (!hcd)
202                 return -ENOMEM;
203         ohci_at91 = hcd_to_ohci_at91_priv(hcd);
204
205         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
206         hcd->regs = devm_ioremap_resource(dev, res);
207         if (IS_ERR(hcd->regs)) {
208                 retval = PTR_ERR(hcd->regs);
209                 goto err;
210         }
211         hcd->rsrc_start = res->start;
212         hcd->rsrc_len = resource_size(res);
213
214         ohci_at91->iclk = devm_clk_get(dev, "ohci_clk");
215         if (IS_ERR(ohci_at91->iclk)) {
216                 dev_err(dev, "failed to get ohci_clk\n");
217                 retval = PTR_ERR(ohci_at91->iclk);
218                 goto err;
219         }
220         ohci_at91->fclk = devm_clk_get(dev, "uhpck");
221         if (IS_ERR(ohci_at91->fclk)) {
222                 dev_err(dev, "failed to get uhpck\n");
223                 retval = PTR_ERR(ohci_at91->fclk);
224                 goto err;
225         }
226         ohci_at91->hclk = devm_clk_get(dev, "hclk");
227         if (IS_ERR(ohci_at91->hclk)) {
228                 dev_err(dev, "failed to get hclk\n");
229                 retval = PTR_ERR(ohci_at91->hclk);
230                 goto err;
231         }
232
233         ohci_at91->suspend_smc_id = at91_dt_suspend_smc(dev);
234         if (!ohci_at91->suspend_smc_id)  {
235                 dev_dbg(dev, "failed to find sfr suspend smc id, using regmap\n");
236                 ohci_at91->sfr_regmap = at91_dt_syscon_sfr();
237                 if (!ohci_at91->sfr_regmap)
238                         dev_dbg(dev, "failed to find sfr node\n");
239         }
240
241         board = hcd->self.controller->platform_data;
242         ohci = hcd_to_ohci(hcd);
243         ohci->num_ports = board->ports;
244         at91_start_hc(pdev);
245
246         /*
247          * The RemoteWakeupConnected bit has to be set explicitly
248          * before calling ohci_run. The reset value of this bit is 0.
249          */
250         ohci->hc_control = OHCI_CTRL_RWC;
251
252         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
253         if (retval == 0) {
254                 device_wakeup_enable(hcd->self.controller);
255                 return retval;
256         }
257
258         /* Error handling */
259         at91_stop_hc(pdev);
260
261  err:
262         usb_put_hcd(hcd);
263         return retval;
264 }
265
266
267 /* may be called with controller, bus, and devices active */
268
269 /*
270  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
271  * @hcd:        USB controller to remove
272  * @pdev:       Platform device required for cleanup
273  *
274  * Context: task context, might sleep
275  *
276  * Reverses the effect of usb_hcd_at91_probe(), first invoking
277  * the HCD's stop() method.  It is always called from a thread
278  * context, "rmmod" or something similar.
279  */
280 static void usb_hcd_at91_remove(struct usb_hcd *hcd,
281                                 struct platform_device *pdev)
282 {
283         usb_remove_hcd(hcd);
284         at91_stop_hc(pdev);
285         usb_put_hcd(hcd);
286 }
287
288 /*-------------------------------------------------------------------------*/
289 static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
290 {
291         if (!valid_port(port))
292                 return;
293
294         gpiod_set_value(pdata->vbus_pin[port], enable);
295 }
296
297 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
298 {
299         if (!valid_port(port))
300                 return -EINVAL;
301
302         return gpiod_get_value(pdata->vbus_pin[port]);
303 }
304
305 /*
306  * Update the status data from the hub with the over-current indicator change.
307  */
308 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
309 {
310         struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
311         int length = ohci_hub_status_data(hcd, buf);
312         int port;
313
314         at91_for_each_port(port) {
315                 if (pdata->overcurrent_changed[port]) {
316                         if (!length)
317                                 length = 1;
318                         buf[0] |= 1 << (port + 1);
319                 }
320         }
321
322         return length;
323 }
324
325 static int ohci_at91_port_suspend(struct ohci_at91_priv *ohci_at91, u8 set)
326 {
327         struct regmap *regmap = ohci_at91->sfr_regmap;
328         u32 regval;
329         int ret;
330
331         if (ohci_at91->suspend_smc_id) {
332                 struct arm_smccc_res res;
333
334                 arm_smccc_smc(ohci_at91->suspend_smc_id, set, 0, 0, 0, 0, 0, 0, &res);
335                 if (res.a0)
336                         return -EINVAL;
337         } else if (regmap) {
338                 ret = regmap_read(regmap, AT91_SFR_OHCIICR, &regval);
339                 if (ret)
340                         return ret;
341
342                 if (set)
343                         regval |= AT91_OHCIICR_USB_SUSPEND;
344                 else
345                         regval &= ~AT91_OHCIICR_USB_SUSPEND;
346
347                 regmap_write(regmap, AT91_SFR_OHCIICR, regval);
348         }
349
350         return 0;
351 }
352
353 /*
354  * Look at the control requests to the root hub and see if we need to override.
355  */
356 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
357                                  u16 wIndex, char *buf, u16 wLength)
358 {
359         struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
360         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
361         struct usb_hub_descriptor *desc;
362         int ret = -EINVAL;
363         u32 *data = (u32 *)buf;
364
365         dev_dbg(hcd->self.controller,
366                 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
367                 hcd, typeReq, wValue, wIndex, buf, wLength);
368
369         wIndex--;
370
371         switch (typeReq) {
372         case SetPortFeature:
373                 switch (wValue) {
374                 case USB_PORT_FEAT_POWER:
375                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
376                         if (valid_port(wIndex)) {
377                                 ohci_at91_usb_set_power(pdata, wIndex, 1);
378                                 ret = 0;
379                         }
380
381                         goto out;
382
383                 case USB_PORT_FEAT_SUSPEND:
384                         dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n");
385                         if (valid_port(wIndex)) {
386                                 ohci_at91_port_suspend(ohci_at91, 1);
387                                 return 0;
388                         }
389                         break;
390                 }
391                 break;
392
393         case ClearPortFeature:
394                 switch (wValue) {
395                 case USB_PORT_FEAT_C_OVER_CURRENT:
396                         dev_dbg(hcd->self.controller,
397                                 "ClearPortFeature: C_OVER_CURRENT\n");
398
399                         if (valid_port(wIndex)) {
400                                 pdata->overcurrent_changed[wIndex] = 0;
401                                 pdata->overcurrent_status[wIndex] = 0;
402                         }
403
404                         goto out;
405
406                 case USB_PORT_FEAT_OVER_CURRENT:
407                         dev_dbg(hcd->self.controller,
408                                 "ClearPortFeature: OVER_CURRENT\n");
409
410                         if (valid_port(wIndex))
411                                 pdata->overcurrent_status[wIndex] = 0;
412
413                         goto out;
414
415                 case USB_PORT_FEAT_POWER:
416                         dev_dbg(hcd->self.controller,
417                                 "ClearPortFeature: POWER\n");
418
419                         if (valid_port(wIndex)) {
420                                 ohci_at91_usb_set_power(pdata, wIndex, 0);
421                                 return 0;
422                         }
423                         break;
424
425                 case USB_PORT_FEAT_SUSPEND:
426                         dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n");
427                         if (valid_port(wIndex)) {
428                                 ohci_at91_port_suspend(ohci_at91, 0);
429                                 return 0;
430                         }
431                         break;
432                 }
433                 break;
434         }
435
436         ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
437         if (ret)
438                 goto out;
439
440         switch (typeReq) {
441         case GetHubDescriptor:
442
443                 /* update the hub's descriptor */
444
445                 desc = (struct usb_hub_descriptor *)buf;
446
447                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
448                         desc->wHubCharacteristics);
449
450                 /* remove the old configurations for power-switching, and
451                  * over-current protection, and insert our new configuration
452                  */
453
454                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
455                 desc->wHubCharacteristics |=
456                         cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM);
457
458                 if (pdata->overcurrent_supported) {
459                         desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
460                         desc->wHubCharacteristics |=
461                                 cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM);
462                 }
463
464                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
465                         desc->wHubCharacteristics);
466
467                 return ret;
468
469         case GetPortStatus:
470                 /* check port status */
471
472                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
473
474                 if (valid_port(wIndex)) {
475                         if (!ohci_at91_usb_get_power(pdata, wIndex))
476                                 *data &= ~cpu_to_le32(RH_PS_PPS);
477
478                         if (pdata->overcurrent_changed[wIndex])
479                                 *data |= cpu_to_le32(RH_PS_OCIC);
480
481                         if (pdata->overcurrent_status[wIndex])
482                                 *data |= cpu_to_le32(RH_PS_POCI);
483                 }
484         }
485
486  out:
487         return ret;
488 }
489
490 /*-------------------------------------------------------------------------*/
491
492 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
493 {
494         struct platform_device *pdev = data;
495         struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
496         int val, port;
497
498         /* From the GPIO notifying the over-current situation, find
499          * out the corresponding port */
500         at91_for_each_port(port) {
501                 if (gpiod_to_irq(pdata->overcurrent_pin[port]) == irq)
502                         break;
503         }
504
505         if (port == AT91_MAX_USBH_PORTS) {
506                 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
507                 return IRQ_HANDLED;
508         }
509
510         val = gpiod_get_value(pdata->overcurrent_pin[port]);
511
512         /* When notified of an over-current situation, disable power
513            on the corresponding port, and mark this port in
514            over-current. */
515         if (!val) {
516                 ohci_at91_usb_set_power(pdata, port, 0);
517                 pdata->overcurrent_status[port]  = 1;
518                 pdata->overcurrent_changed[port] = 1;
519         }
520
521         dev_dbg(& pdev->dev, "overcurrent situation %s\n",
522                 val ? "exited" : "notified");
523
524         return IRQ_HANDLED;
525 }
526
527 static const struct of_device_id at91_ohci_dt_ids[] = {
528         { .compatible = "atmel,at91rm9200-ohci" },
529         { /* sentinel */ }
530 };
531
532 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
533
534 /*-------------------------------------------------------------------------*/
535
536 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
537 {
538         struct device_node *np = pdev->dev.of_node;
539         struct at91_usbh_data   *pdata;
540         int                     i;
541         int                     ret;
542         int                     err;
543         u32                     ports;
544
545         /* Right now device-tree probed devices don't get dma_mask set.
546          * Since shared usb code relies on it, set it here for now.
547          * Once we have dma capability bindings this can go away.
548          */
549         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
550         if (ret)
551                 return ret;
552
553         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
554         if (!pdata)
555                 return -ENOMEM;
556
557         pdev->dev.platform_data = pdata;
558
559         if (!of_property_read_u32(np, "num-ports", &ports))
560                 pdata->ports = ports;
561
562         at91_for_each_port(i) {
563                 if (i >= pdata->ports)
564                         break;
565
566                 pdata->vbus_pin[i] =
567                         devm_gpiod_get_index_optional(&pdev->dev, "atmel,vbus",
568                                                       i, GPIOD_OUT_HIGH);
569                 if (IS_ERR(pdata->vbus_pin[i])) {
570                         err = PTR_ERR(pdata->vbus_pin[i]);
571                         dev_err(&pdev->dev, "unable to claim gpio \"vbus\": %d\n", err);
572                         continue;
573                 }
574         }
575
576         at91_for_each_port(i) {
577                 if (i >= pdata->ports)
578                         break;
579
580                 pdata->overcurrent_pin[i] =
581                         devm_gpiod_get_index_optional(&pdev->dev, "atmel,oc",
582                                                       i, GPIOD_IN);
583                 if (!pdata->overcurrent_pin[i])
584                         continue;
585                 if (IS_ERR(pdata->overcurrent_pin[i])) {
586                         err = PTR_ERR(pdata->overcurrent_pin[i]);
587                         dev_err(&pdev->dev, "unable to claim gpio \"overcurrent\": %d\n", err);
588                         continue;
589                 }
590
591                 ret = devm_request_irq(&pdev->dev,
592                                        gpiod_to_irq(pdata->overcurrent_pin[i]),
593                                        ohci_hcd_at91_overcurrent_irq,
594                                        IRQF_SHARED,
595                                        "ohci_overcurrent", pdev);
596                 if (ret)
597                         dev_info(&pdev->dev, "failed to request gpio \"overcurrent\" IRQ\n");
598         }
599
600         device_init_wakeup(&pdev->dev, 1);
601         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
602 }
603
604 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
605 {
606         struct at91_usbh_data   *pdata = dev_get_platdata(&pdev->dev);
607         int                     i;
608
609         if (pdata) {
610                 at91_for_each_port(i)
611                         ohci_at91_usb_set_power(pdata, i, 0);
612         }
613
614         device_init_wakeup(&pdev->dev, 0);
615         usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
616         return 0;
617 }
618
619 static int __maybe_unused
620 ohci_hcd_at91_drv_suspend(struct device *dev)
621 {
622         struct usb_hcd  *hcd = dev_get_drvdata(dev);
623         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
624         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
625         int             ret;
626
627         /*
628          * Disable wakeup if we are going to sleep with slow clock mode
629          * enabled.
630          */
631         ohci_at91->wakeup = device_may_wakeup(dev)
632                         && !at91_suspend_entering_slow_clock();
633
634         if (ohci_at91->wakeup)
635                 enable_irq_wake(hcd->irq);
636
637         ret = ohci_suspend(hcd, ohci_at91->wakeup);
638         if (ret) {
639                 if (ohci_at91->wakeup)
640                         disable_irq_wake(hcd->irq);
641                 return ret;
642         }
643         /*
644          * The integrated transceivers seem unable to notice disconnect,
645          * reconnect, or wakeup without the 48 MHz clock active.  so for
646          * correctness, always discard connection state (using reset).
647          *
648          * REVISIT: some boards will be able to turn VBUS off...
649          */
650         if (!ohci_at91->wakeup) {
651                 ohci->rh_state = OHCI_RH_HALTED;
652
653                 /* flush the writes */
654                 (void) ohci_readl (ohci, &ohci->regs->control);
655                 msleep(1);
656                 ohci_at91_port_suspend(ohci_at91, 1);
657                 at91_stop_clock(ohci_at91);
658         } else {
659                 ohci_at91_port_suspend(ohci_at91, 1);
660         }
661
662         return ret;
663 }
664
665 static int __maybe_unused
666 ohci_hcd_at91_drv_resume(struct device *dev)
667 {
668         struct usb_hcd  *hcd = dev_get_drvdata(dev);
669         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
670
671         ohci_at91_port_suspend(ohci_at91, 0);
672
673         if (ohci_at91->wakeup)
674                 disable_irq_wake(hcd->irq);
675         else
676                 at91_start_clock(ohci_at91);
677
678         ohci_resume(hcd, false);
679
680         return 0;
681 }
682
683 static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend,
684                                         ohci_hcd_at91_drv_resume);
685
686 static struct platform_driver ohci_hcd_at91_driver = {
687         .probe          = ohci_hcd_at91_drv_probe,
688         .remove         = ohci_hcd_at91_drv_remove,
689         .shutdown       = usb_hcd_platform_shutdown,
690         .driver         = {
691                 .name   = "at91_ohci",
692                 .pm     = &ohci_hcd_at91_pm_ops,
693                 .of_match_table = at91_ohci_dt_ids,
694         },
695 };
696
697 static int __init ohci_at91_init(void)
698 {
699         if (usb_disabled())
700                 return -ENODEV;
701
702         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
703         ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides);
704
705         /*
706          * The Atmel HW has some unusual quirks, which require Atmel-specific
707          * workarounds. We override certain hc_driver functions here to
708          * achieve that. We explicitly do not enhance ohci_driver_overrides to
709          * allow this more easily, since this is an unusual case, and we don't
710          * want to encourage others to override these functions by making it
711          * too easy.
712          */
713
714         ohci_at91_hc_driver.hub_status_data     = ohci_at91_hub_status_data;
715         ohci_at91_hc_driver.hub_control         = ohci_at91_hub_control;
716
717         return platform_driver_register(&ohci_hcd_at91_driver);
718 }
719 module_init(ohci_at91_init);
720
721 static void __exit ohci_at91_cleanup(void)
722 {
723         platform_driver_unregister(&ohci_hcd_at91_driver);
724 }
725 module_exit(ohci_at91_cleanup);
726
727 MODULE_DESCRIPTION(DRIVER_DESC);
728 MODULE_LICENSE("GPL");
729 MODULE_ALIAS("platform:at91_ohci");
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