1// SPDX-License-Identifier: GPL-1.0+
2/*
3 * OHCI HCD (Host Controller Driver) for USB.
4 *
5 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
6 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
7 * (C) Copyright 2002 Hewlett-Packard Company
8 *
9 * Bus Glue for pxa27x
10 *
11 * Written by Christopher Hoover <ch@hpl.hp.com>
12 * Based on fragments of previous driver by Russell King et al.
13 *
14 * Modified for LH7A404 from ohci-sa1111.c
15 * by Durgesh Pattamatta <pattamattad@sharpsec.com>
16 *
17 * Modified for pxa27x from ohci-lh7a404.c
18 * by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
19 *
20 * This file is licenced under the GPL.
21 */
22
23#include <linux/clk.h>
24#include <linux/device.h>
25#include <linux/dma-mapping.h>
26#include <linux/io.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/of_platform.h>
30#include <linux/platform_data/usb-ohci-pxa27x.h>
31#include <linux/platform_data/pxa2xx_udc.h>
32#include <linux/platform_device.h>
33#include <linux/regulator/consumer.h>
34#include <linux/signal.h>
35#include <linux/usb.h>
36#include <linux/usb/hcd.h>
37#include <linux/usb/otg.h>
38#include <linux/soc/pxa/cpu.h>
39
40#include "ohci.h"
41
42#define DRIVER_DESC "OHCI PXA27x/PXA3x driver"
43
44/*
45 * UHC: USB Host Controller (OHCI-like) register definitions
46 */
47#define UHCREV (0x0000) /* UHC HCI Spec Revision */
48#define UHCHCON (0x0004) /* UHC Host Control Register */
49#define UHCCOMS (0x0008) /* UHC Command Status Register */
50#define UHCINTS (0x000C) /* UHC Interrupt Status Register */
51#define UHCINTE (0x0010) /* UHC Interrupt Enable */
52#define UHCINTD (0x0014) /* UHC Interrupt Disable */
53#define UHCHCCA (0x0018) /* UHC Host Controller Comm. Area */
54#define UHCPCED (0x001C) /* UHC Period Current Endpt Descr */
55#define UHCCHED (0x0020) /* UHC Control Head Endpt Descr */
56#define UHCCCED (0x0024) /* UHC Control Current Endpt Descr */
57#define UHCBHED (0x0028) /* UHC Bulk Head Endpt Descr */
58#define UHCBCED (0x002C) /* UHC Bulk Current Endpt Descr */
59#define UHCDHEAD (0x0030) /* UHC Done Head */
60#define UHCFMI (0x0034) /* UHC Frame Interval */
61#define UHCFMR (0x0038) /* UHC Frame Remaining */
62#define UHCFMN (0x003C) /* UHC Frame Number */
63#define UHCPERS (0x0040) /* UHC Periodic Start */
64#define UHCLS (0x0044) /* UHC Low Speed Threshold */
65
66#define UHCRHDA (0x0048) /* UHC Root Hub Descriptor A */
67#define UHCRHDA_NOCP (1 << 12) /* No over current protection */
68#define UHCRHDA_OCPM (1 << 11) /* Over Current Protection Mode */
69#define UHCRHDA_POTPGT(x) \
70 (((x) & 0xff) << 24) /* Power On To Power Good Time */
71
72#define UHCRHDB (0x004C) /* UHC Root Hub Descriptor B */
73#define UHCRHS (0x0050) /* UHC Root Hub Status */
74#define UHCRHPS1 (0x0054) /* UHC Root Hub Port 1 Status */
75#define UHCRHPS2 (0x0058) /* UHC Root Hub Port 2 Status */
76#define UHCRHPS3 (0x005C) /* UHC Root Hub Port 3 Status */
77
78#define UHCSTAT (0x0060) /* UHC Status Register */
79#define UHCSTAT_UPS3 (1 << 16) /* USB Power Sense Port3 */
80#define UHCSTAT_SBMAI (1 << 15) /* System Bus Master Abort Interrupt*/
81#define UHCSTAT_SBTAI (1 << 14) /* System Bus Target Abort Interrupt*/
82#define UHCSTAT_UPRI (1 << 13) /* USB Port Resume Interrupt */
83#define UHCSTAT_UPS2 (1 << 12) /* USB Power Sense Port 2 */
84#define UHCSTAT_UPS1 (1 << 11) /* USB Power Sense Port 1 */
85#define UHCSTAT_HTA (1 << 10) /* HCI Target Abort */
86#define UHCSTAT_HBA (1 << 8) /* HCI Buffer Active */
87#define UHCSTAT_RWUE (1 << 7) /* HCI Remote Wake Up Event */
88
89#define UHCHR (0x0064) /* UHC Reset Register */
90#define UHCHR_SSEP3 (1 << 11) /* Sleep Standby Enable for Port3 */
91#define UHCHR_SSEP2 (1 << 10) /* Sleep Standby Enable for Port2 */
92#define UHCHR_SSEP1 (1 << 9) /* Sleep Standby Enable for Port1 */
93#define UHCHR_PCPL (1 << 7) /* Power control polarity low */
94#define UHCHR_PSPL (1 << 6) /* Power sense polarity low */
95#define UHCHR_SSE (1 << 5) /* Sleep Standby Enable */
96#define UHCHR_UIT (1 << 4) /* USB Interrupt Test */
97#define UHCHR_SSDC (1 << 3) /* Simulation Scale Down Clock */
98#define UHCHR_CGR (1 << 2) /* Clock Generation Reset */
99#define UHCHR_FHR (1 << 1) /* Force Host Controller Reset */
100#define UHCHR_FSBIR (1 << 0) /* Force System Bus Iface Reset */
101
102#define UHCHIE (0x0068) /* UHC Interrupt Enable Register*/
103#define UHCHIE_UPS3IE (1 << 14) /* Power Sense Port3 IntEn */
104#define UHCHIE_UPRIE (1 << 13) /* Port Resume IntEn */
105#define UHCHIE_UPS2IE (1 << 12) /* Power Sense Port2 IntEn */
106#define UHCHIE_UPS1IE (1 << 11) /* Power Sense Port1 IntEn */
107#define UHCHIE_TAIE (1 << 10) /* HCI Interface Transfer Abort
108 Interrupt Enable*/
109#define UHCHIE_HBAIE (1 << 8) /* HCI Buffer Active IntEn */
110#define UHCHIE_RWIE (1 << 7) /* Remote Wake-up IntEn */
111
112#define UHCHIT (0x006C) /* UHC Interrupt Test register */
113
114#define PXA_UHC_MAX_PORTNUM 3
115
116static struct hc_driver __read_mostly ohci_pxa27x_hc_driver;
117
118struct pxa27x_ohci {
119 struct clk *clk;
120 void __iomem *mmio_base;
121 struct regulator *vbus[3];
122 bool vbus_enabled[3];
123};
124
125#define to_pxa27x_ohci(hcd) (struct pxa27x_ohci *)(hcd_to_ohci(hcd)->priv)
126
127/*
128 PMM_NPS_MODE -- PMM Non-power switching mode
129 Ports are powered continuously.
130
131 PMM_GLOBAL_MODE -- PMM global switching mode
132 All ports are powered at the same time.
133
134 PMM_PERPORT_MODE -- PMM per port switching mode
135 Ports are powered individually.
136 */
137static int pxa27x_ohci_select_pmm(struct pxa27x_ohci *pxa_ohci, int mode)
138{
139 uint32_t uhcrhda = __raw_readl(addr: pxa_ohci->mmio_base + UHCRHDA);
140 uint32_t uhcrhdb = __raw_readl(addr: pxa_ohci->mmio_base + UHCRHDB);
141
142 switch (mode) {
143 case PMM_NPS_MODE:
144 uhcrhda |= RH_A_NPS;
145 break;
146 case PMM_GLOBAL_MODE:
147 uhcrhda &= ~(RH_A_NPS | RH_A_PSM);
148 break;
149 case PMM_PERPORT_MODE:
150 uhcrhda &= ~(RH_A_NPS);
151 uhcrhda |= RH_A_PSM;
152
153 /* Set port power control mask bits, only 3 ports. */
154 uhcrhdb |= (0x7<<17);
155 break;
156 default:
157 printk( KERN_ERR
158 "Invalid mode %d, set to non-power switch mode.\n",
159 mode );
160
161 uhcrhda |= RH_A_NPS;
162 }
163
164 __raw_writel(val: uhcrhda, addr: pxa_ohci->mmio_base + UHCRHDA);
165 __raw_writel(val: uhcrhdb, addr: pxa_ohci->mmio_base + UHCRHDB);
166 return 0;
167}
168
169static int pxa27x_ohci_set_vbus_power(struct pxa27x_ohci *pxa_ohci,
170 unsigned int port, bool enable)
171{
172 struct regulator *vbus = pxa_ohci->vbus[port];
173 int ret = 0;
174
175 if (IS_ERR_OR_NULL(ptr: vbus))
176 return 0;
177
178 if (enable && !pxa_ohci->vbus_enabled[port])
179 ret = regulator_enable(regulator: vbus);
180 else if (!enable && pxa_ohci->vbus_enabled[port])
181 ret = regulator_disable(regulator: vbus);
182
183 if (ret < 0)
184 return ret;
185
186 pxa_ohci->vbus_enabled[port] = enable;
187
188 return 0;
189}
190
191static int pxa27x_ohci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
192 u16 wIndex, char *buf, u16 wLength)
193{
194 struct pxa27x_ohci *pxa_ohci = to_pxa27x_ohci(hcd);
195 int ret;
196
197 switch (typeReq) {
198 case SetPortFeature:
199 case ClearPortFeature:
200 if (!wIndex || wIndex > 3)
201 return -EPIPE;
202
203 if (wValue != USB_PORT_FEAT_POWER)
204 break;
205
206 ret = pxa27x_ohci_set_vbus_power(pxa_ohci, port: wIndex - 1,
207 enable: typeReq == SetPortFeature);
208 if (ret)
209 return ret;
210 break;
211 }
212
213 return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
214}
215/*-------------------------------------------------------------------------*/
216
217static inline void pxa27x_setup_hc(struct pxa27x_ohci *pxa_ohci,
218 struct pxaohci_platform_data *inf)
219{
220 uint32_t uhchr = __raw_readl(addr: pxa_ohci->mmio_base + UHCHR);
221 uint32_t uhcrhda = __raw_readl(addr: pxa_ohci->mmio_base + UHCRHDA);
222
223 if (inf->flags & ENABLE_PORT1)
224 uhchr &= ~UHCHR_SSEP1;
225
226 if (inf->flags & ENABLE_PORT2)
227 uhchr &= ~UHCHR_SSEP2;
228
229 if (inf->flags & ENABLE_PORT3)
230 uhchr &= ~UHCHR_SSEP3;
231
232 if (inf->flags & POWER_CONTROL_LOW)
233 uhchr |= UHCHR_PCPL;
234
235 if (inf->flags & POWER_SENSE_LOW)
236 uhchr |= UHCHR_PSPL;
237
238 if (inf->flags & NO_OC_PROTECTION)
239 uhcrhda |= UHCRHDA_NOCP;
240 else
241 uhcrhda &= ~UHCRHDA_NOCP;
242
243 if (inf->flags & OC_MODE_PERPORT)
244 uhcrhda |= UHCRHDA_OCPM;
245 else
246 uhcrhda &= ~UHCRHDA_OCPM;
247
248 if (inf->power_on_delay) {
249 uhcrhda &= ~UHCRHDA_POTPGT(0xff);
250 uhcrhda |= UHCRHDA_POTPGT(inf->power_on_delay / 2);
251 }
252
253 __raw_writel(val: uhchr, addr: pxa_ohci->mmio_base + UHCHR);
254 __raw_writel(val: uhcrhda, addr: pxa_ohci->mmio_base + UHCRHDA);
255}
256
257static inline void pxa27x_reset_hc(struct pxa27x_ohci *pxa_ohci)
258{
259 uint32_t uhchr = __raw_readl(addr: pxa_ohci->mmio_base + UHCHR);
260
261 __raw_writel(val: uhchr | UHCHR_FHR, addr: pxa_ohci->mmio_base + UHCHR);
262 udelay(usec: 11);
263 __raw_writel(val: uhchr & ~UHCHR_FHR, addr: pxa_ohci->mmio_base + UHCHR);
264}
265
266static int pxa27x_start_hc(struct pxa27x_ohci *pxa_ohci, struct device *dev)
267{
268 int retval;
269 struct pxaohci_platform_data *inf;
270 uint32_t uhchr;
271
272 inf = dev_get_platdata(dev);
273
274 retval = clk_prepare_enable(clk: pxa_ohci->clk);
275 if (retval)
276 return retval;
277
278 pxa27x_reset_hc(pxa_ohci);
279
280 uhchr = __raw_readl(addr: pxa_ohci->mmio_base + UHCHR) | UHCHR_FSBIR;
281 __raw_writel(val: uhchr, addr: pxa_ohci->mmio_base + UHCHR);
282
283 while (__raw_readl(addr: pxa_ohci->mmio_base + UHCHR) & UHCHR_FSBIR)
284 cpu_relax();
285
286 pxa27x_setup_hc(pxa_ohci, inf);
287
288 if (inf->init)
289 retval = inf->init(dev);
290
291 if (retval < 0) {
292 clk_disable_unprepare(clk: pxa_ohci->clk);
293 return retval;
294 }
295
296 uhchr = __raw_readl(addr: pxa_ohci->mmio_base + UHCHR) & ~UHCHR_SSE;
297 __raw_writel(val: uhchr, addr: pxa_ohci->mmio_base + UHCHR);
298 __raw_writel(UHCHIE_UPRIE | UHCHIE_RWIE, addr: pxa_ohci->mmio_base + UHCHIE);
299
300 /* Clear any OTG Pin Hold */
301 pxa27x_clear_otgph();
302 return 0;
303}
304
305static void pxa27x_stop_hc(struct pxa27x_ohci *pxa_ohci, struct device *dev)
306{
307 struct pxaohci_platform_data *inf;
308 uint32_t uhccoms;
309
310 inf = dev_get_platdata(dev);
311
312 if (inf->exit)
313 inf->exit(dev);
314
315 pxa27x_reset_hc(pxa_ohci);
316
317 /* Host Controller Reset */
318 uhccoms = __raw_readl(addr: pxa_ohci->mmio_base + UHCCOMS) | 0x01;
319 __raw_writel(val: uhccoms, addr: pxa_ohci->mmio_base + UHCCOMS);
320 udelay(usec: 10);
321
322 clk_disable_unprepare(clk: pxa_ohci->clk);
323}
324
325#ifdef CONFIG_OF
326static const struct of_device_id pxa_ohci_dt_ids[] = {
327 { .compatible = "marvell,pxa-ohci" },
328 { }
329};
330
331MODULE_DEVICE_TABLE(of, pxa_ohci_dt_ids);
332
333static int ohci_pxa_of_init(struct platform_device *pdev)
334{
335 struct device_node *np = pdev->dev.of_node;
336 struct pxaohci_platform_data *pdata;
337 u32 tmp;
338 int ret;
339
340 if (!np)
341 return 0;
342
343 /* Right now device-tree probed devices don't get dma_mask set.
344 * Since shared usb code relies on it, set it here for now.
345 * Once we have dma capability bindings this can go away.
346 */
347 ret = dma_coerce_mask_and_coherent(dev: &pdev->dev, DMA_BIT_MASK(32));
348 if (ret)
349 return ret;
350
351 pdata = devm_kzalloc(dev: &pdev->dev, size: sizeof(*pdata), GFP_KERNEL);
352 if (!pdata)
353 return -ENOMEM;
354
355 if (of_property_read_bool(np, propname: "marvell,enable-port1"))
356 pdata->flags |= ENABLE_PORT1;
357 if (of_property_read_bool(np, propname: "marvell,enable-port2"))
358 pdata->flags |= ENABLE_PORT2;
359 if (of_property_read_bool(np, propname: "marvell,enable-port3"))
360 pdata->flags |= ENABLE_PORT3;
361 if (of_property_read_bool(np, propname: "marvell,port-sense-low"))
362 pdata->flags |= POWER_SENSE_LOW;
363 if (of_property_read_bool(np, propname: "marvell,power-control-low"))
364 pdata->flags |= POWER_CONTROL_LOW;
365 if (of_property_read_bool(np, propname: "marvell,no-oc-protection"))
366 pdata->flags |= NO_OC_PROTECTION;
367 if (of_property_read_bool(np, propname: "marvell,oc-mode-perport"))
368 pdata->flags |= OC_MODE_PERPORT;
369 if (!of_property_read_u32(np, propname: "marvell,power-on-delay", out_value: &tmp))
370 pdata->power_on_delay = tmp;
371 if (!of_property_read_u32(np, propname: "marvell,port-mode", out_value: &tmp))
372 pdata->port_mode = tmp;
373 if (!of_property_read_u32(np, propname: "marvell,power-budget", out_value: &tmp))
374 pdata->power_budget = tmp;
375
376 pdev->dev.platform_data = pdata;
377
378 return 0;
379}
380#else
381static int ohci_pxa_of_init(struct platform_device *pdev)
382{
383 return 0;
384}
385#endif
386
387/*-------------------------------------------------------------------------*/
388
389/* configure so an HC device and id are always provided */
390/* always called with process context; sleeping is OK */
391
392
393/**
394 * ohci_hcd_pxa27x_probe - initialize pxa27x-based HCDs
395 * @pdev: USB Host controller to probe
396 *
397 * Context: task context, might sleep
398 *
399 * Allocates basic resources for this USB host controller, and
400 * then invokes the start() method for the HCD associated with it
401 * through the hotplug entry's driver_data.
402 */
403static int ohci_hcd_pxa27x_probe(struct platform_device *pdev)
404{
405 int retval, irq;
406 struct usb_hcd *hcd;
407 struct pxaohci_platform_data *inf;
408 struct pxa27x_ohci *pxa_ohci;
409 struct ohci_hcd *ohci;
410 struct resource *r;
411 struct clk *usb_clk;
412 unsigned int i;
413
414 retval = ohci_pxa_of_init(pdev);
415 if (retval)
416 return retval;
417
418 inf = dev_get_platdata(dev: &pdev->dev);
419
420 if (!inf)
421 return -ENODEV;
422
423 irq = platform_get_irq(pdev, 0);
424 if (irq < 0) {
425 pr_err("no resource of IORESOURCE_IRQ");
426 return irq;
427 }
428
429 usb_clk = devm_clk_get(dev: &pdev->dev, NULL);
430 if (IS_ERR(ptr: usb_clk))
431 return PTR_ERR(ptr: usb_clk);
432
433 hcd = usb_create_hcd(driver: &ohci_pxa27x_hc_driver, dev: &pdev->dev, bus_name: "pxa27x");
434 if (!hcd)
435 return -ENOMEM;
436
437 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &r);
438 if (IS_ERR(ptr: hcd->regs)) {
439 retval = PTR_ERR(ptr: hcd->regs);
440 goto err;
441 }
442 hcd->rsrc_start = r->start;
443 hcd->rsrc_len = resource_size(res: r);
444
445 /* initialize "struct pxa27x_ohci" */
446 pxa_ohci = to_pxa27x_ohci(hcd);
447 pxa_ohci->clk = usb_clk;
448 pxa_ohci->mmio_base = (void __iomem *)hcd->regs;
449
450 for (i = 0; i < 3; ++i) {
451 char name[6];
452
453 if (!(inf->flags & (ENABLE_PORT1 << i)))
454 continue;
455
456 sprintf(buf: name, fmt: "vbus%u", i + 1);
457 pxa_ohci->vbus[i] = devm_regulator_get(dev: &pdev->dev, id: name);
458 }
459
460 retval = pxa27x_start_hc(pxa_ohci, dev: &pdev->dev);
461 if (retval < 0) {
462 pr_debug("pxa27x_start_hc failed");
463 goto err;
464 }
465
466 /* Select Power Management Mode */
467 pxa27x_ohci_select_pmm(pxa_ohci, mode: inf->port_mode);
468
469 if (inf->power_budget)
470 hcd->power_budget = inf->power_budget;
471
472 /* The value of NDP in roothub_a is incorrect on this hardware */
473 ohci = hcd_to_ohci(hcd);
474 ohci->num_ports = 3;
475
476 retval = usb_add_hcd(hcd, irqnum: irq, irqflags: 0);
477 if (retval == 0) {
478 device_wakeup_enable(dev: hcd->self.controller);
479 return retval;
480 }
481
482 pxa27x_stop_hc(pxa_ohci, dev: &pdev->dev);
483 err:
484 usb_put_hcd(hcd);
485 return retval;
486}
487
488
489/* may be called without controller electrically present */
490/* may be called with controller, bus, and devices active */
491
492/**
493 * ohci_hcd_pxa27x_remove - shutdown processing for pxa27x-based HCDs
494 * @pdev: USB Host Controller being removed
495 *
496 * Context: task context, might sleep
497 *
498 * Reverses the effect of ohci_hcd_pxa27x_probe(), first invoking
499 * the HCD's stop() method. It is always called from a thread
500 * context, normally "rmmod", "apmd", or something similar.
501 */
502static void ohci_hcd_pxa27x_remove(struct platform_device *pdev)
503{
504 struct usb_hcd *hcd = platform_get_drvdata(pdev);
505 struct pxa27x_ohci *pxa_ohci = to_pxa27x_ohci(hcd);
506 unsigned int i;
507
508 usb_remove_hcd(hcd);
509 pxa27x_stop_hc(pxa_ohci, dev: &pdev->dev);
510
511 for (i = 0; i < 3; ++i)
512 pxa27x_ohci_set_vbus_power(pxa_ohci, port: i, enable: false);
513
514 usb_put_hcd(hcd);
515}
516
517/*-------------------------------------------------------------------------*/
518
519#ifdef CONFIG_PM
520static int ohci_hcd_pxa27x_drv_suspend(struct device *dev)
521{
522 struct usb_hcd *hcd = dev_get_drvdata(dev);
523 struct pxa27x_ohci *pxa_ohci = to_pxa27x_ohci(hcd);
524 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
525 bool do_wakeup = device_may_wakeup(dev);
526 int ret;
527
528
529 if (time_before(jiffies, ohci->next_statechange))
530 msleep(msecs: 5);
531 ohci->next_statechange = jiffies;
532
533 ret = ohci_suspend(hcd, do_wakeup);
534 if (ret)
535 return ret;
536
537 pxa27x_stop_hc(pxa_ohci, dev);
538 return ret;
539}
540
541static int ohci_hcd_pxa27x_drv_resume(struct device *dev)
542{
543 struct usb_hcd *hcd = dev_get_drvdata(dev);
544 struct pxa27x_ohci *pxa_ohci = to_pxa27x_ohci(hcd);
545 struct pxaohci_platform_data *inf = dev_get_platdata(dev);
546 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
547 int status;
548
549 if (time_before(jiffies, ohci->next_statechange))
550 msleep(msecs: 5);
551 ohci->next_statechange = jiffies;
552
553 status = pxa27x_start_hc(pxa_ohci, dev);
554 if (status < 0)
555 return status;
556
557 /* Select Power Management Mode */
558 pxa27x_ohci_select_pmm(pxa_ohci, mode: inf->port_mode);
559
560 ohci_resume(hcd, hibernated: false);
561 return 0;
562}
563
564static const struct dev_pm_ops ohci_hcd_pxa27x_pm_ops = {
565 .suspend = ohci_hcd_pxa27x_drv_suspend,
566 .resume = ohci_hcd_pxa27x_drv_resume,
567};
568#endif
569
570static struct platform_driver ohci_hcd_pxa27x_driver = {
571 .probe = ohci_hcd_pxa27x_probe,
572 .remove = ohci_hcd_pxa27x_remove,
573 .shutdown = usb_hcd_platform_shutdown,
574 .driver = {
575 .name = "pxa27x-ohci",
576 .of_match_table = of_match_ptr(pxa_ohci_dt_ids),
577#ifdef CONFIG_PM
578 .pm = &ohci_hcd_pxa27x_pm_ops,
579#endif
580 },
581};
582
583static const struct ohci_driver_overrides pxa27x_overrides __initconst = {
584 .extra_priv_size = sizeof(struct pxa27x_ohci),
585};
586
587static int __init ohci_pxa27x_init(void)
588{
589 if (usb_disabled())
590 return -ENODEV;
591
592 ohci_init_driver(drv: &ohci_pxa27x_hc_driver, over: &pxa27x_overrides);
593 ohci_pxa27x_hc_driver.hub_control = pxa27x_ohci_hub_control;
594
595 return platform_driver_register(&ohci_hcd_pxa27x_driver);
596}
597module_init(ohci_pxa27x_init);
598
599static void __exit ohci_pxa27x_cleanup(void)
600{
601 platform_driver_unregister(&ohci_hcd_pxa27x_driver);
602}
603module_exit(ohci_pxa27x_cleanup);
604
605MODULE_DESCRIPTION(DRIVER_DESC);
606MODULE_LICENSE("GPL");
607MODULE_ALIAS("platform:pxa27x-ohci");
608

source code of linux/drivers/usb/host/ohci-pxa27x.c