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