ohci-s3c2410.c revision 7f927fcc2fd1575d01efb4b76665975007945690 
1/*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
6 * (C) Copyright 2002 Hewlett-Packard Company
7 *
8 * USB Bus Glue for Samsung S3C2410
9 *
10 * Written by Christopher Hoover <ch@hpl.hp.com>
11 * Based on fragments of previous driver by Rusell King et al.
12 *
13 * Modified for S3C2410 from ohci-sa1111.c, ohci-omap.c and ohci-lh7a40.c
14 *	by Ben Dooks, <ben@simtec.co.uk>
15 *	Copyright (C) 2004 Simtec Electronics
16 *
17 * Thanks to basprog@mail.ru for updates to newer kernels
18 *
19 * This file is licenced under the GPL.
20*/
21
22#include <linux/platform_device.h>
23#include <linux/clk.h>
24
25#include <asm/hardware.h>
26#include <asm/arch/usb-control.h>
27
28#define valid_port(idx) ((idx) == 1 || (idx) == 2)
29
30/* clock device associated with the hcd */
31
32static struct clk *clk;
33
34/* forward definitions */
35
36static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc);
37
38/* conversion functions */
39
40struct s3c2410_hcd_info *to_s3c2410_info(struct usb_hcd *hcd)
41{
42	return hcd->self.controller->platform_data;
43}
44
45static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
46{
47	struct s3c2410_hcd_info *info = dev->dev.platform_data;
48
49	dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
50	clk_enable(clk);
51
52	if (info != NULL) {
53		info->hcd	= hcd;
54		info->report_oc = s3c2410_hcd_oc;
55
56		if (info->enable_oc != NULL) {
57			(info->enable_oc)(info, 1);
58		}
59	}
60}
61
62static void s3c2410_stop_hc(struct platform_device *dev)
63{
64	struct s3c2410_hcd_info *info = dev->dev.platform_data;
65
66	dev_dbg(&dev->dev, "s3c2410_stop_hc:\n");
67
68	if (info != NULL) {
69		info->report_oc = NULL;
70		info->hcd	= NULL;
71
72		if (info->enable_oc != NULL) {
73			(info->enable_oc)(info, 0);
74		}
75	}
76
77	clk_disable(clk);
78}
79
80/* ohci_s3c2410_hub_status_data
81 *
82 * update the status data from the hub with anything that
83 * has been detected by our system
84*/
85
86static int
87ohci_s3c2410_hub_status_data (struct usb_hcd *hcd, char *buf)
88{
89	struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
90	struct s3c2410_hcd_port *port;
91	int orig;
92	int portno;
93
94	orig  = ohci_hub_status_data (hcd, buf);
95
96	if (info == NULL)
97		return orig;
98
99	port = &info->port[0];
100
101	/* mark any changed port as changed */
102
103	for (portno = 0; portno < 2; port++, portno++) {
104		if (port->oc_changed == 1 &&
105		    port->flags & S3C_HCDFLG_USED) {
106			dev_dbg(hcd->self.controller,
107				"oc change on port %d\n", portno);
108
109			if (orig < 1)
110				orig = 1;
111
112			buf[0] |= 1<<(portno+1);
113		}
114	}
115
116	return orig;
117}
118
119/* s3c2410_usb_set_power
120 *
121 * configure the power on a port, by calling the platform device
122 * routine registered with the platform device
123*/
124
125static void s3c2410_usb_set_power(struct s3c2410_hcd_info *info,
126				  int port, int to)
127{
128	if (info == NULL)
129		return;
130
131	if (info->power_control != NULL) {
132		info->port[port-1].power = to;
133		(info->power_control)(port-1, to);
134	}
135}
136
137/* ohci_s3c2410_hub_control
138 *
139 * look at control requests to the hub, and see if we need
140 * to take any action or over-ride the results from the
141 * request.
142*/
143
144static int ohci_s3c2410_hub_control (
145	struct usb_hcd	*hcd,
146	u16		typeReq,
147	u16		wValue,
148	u16		wIndex,
149	char		*buf,
150	u16		wLength)
151{
152	struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
153	struct usb_hub_descriptor *desc;
154	int ret = -EINVAL;
155	u32 *data = (u32 *)buf;
156
157	dev_dbg(hcd->self.controller,
158		"s3c2410_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
159		hcd, typeReq, wValue, wIndex, buf, wLength);
160
161	/* if we are only an humble host without any special capabilities
162	 * process the request straight away and exit */
163
164	if (info == NULL) {
165		ret = ohci_hub_control(hcd, typeReq, wValue,
166				       wIndex, buf, wLength);
167		goto out;
168	}
169
170	/* check the request to see if it needs handling */
171
172	switch (typeReq) {
173	case SetPortFeature:
174		if (wValue == USB_PORT_FEAT_POWER) {
175			dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
176			s3c2410_usb_set_power(info, wIndex, 1);
177			goto out;
178		}
179		break;
180
181	case ClearPortFeature:
182		switch (wValue) {
183		case USB_PORT_FEAT_C_OVER_CURRENT:
184			dev_dbg(hcd->self.controller,
185				"ClearPortFeature: C_OVER_CURRENT\n");
186
187			if (valid_port(wIndex)) {
188				info->port[wIndex-1].oc_changed = 0;
189				info->port[wIndex-1].oc_status = 0;
190			}
191
192			goto out;
193
194		case USB_PORT_FEAT_OVER_CURRENT:
195			dev_dbg(hcd->self.controller,
196				"ClearPortFeature: OVER_CURRENT\n");
197
198			if (valid_port(wIndex)) {
199				info->port[wIndex-1].oc_status = 0;
200			}
201
202			goto out;
203
204		case USB_PORT_FEAT_POWER:
205			dev_dbg(hcd->self.controller,
206				"ClearPortFeature: POWER\n");
207
208			if (valid_port(wIndex)) {
209				s3c2410_usb_set_power(info, wIndex, 0);
210				return 0;
211			}
212		}
213		break;
214	}
215
216	ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
217	if (ret)
218		goto out;
219
220	switch (typeReq) {
221	case GetHubDescriptor:
222
223		/* update the hub's descriptor */
224
225		desc = (struct usb_hub_descriptor *)buf;
226
227		if (info->power_control == NULL)
228			return ret;
229
230		dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
231			desc->wHubCharacteristics);
232
233		/* remove the old configurations for power-switching, and
234		 * over-current protection, and insert our new configuration
235		 */
236
237		desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
238		desc->wHubCharacteristics |= cpu_to_le16(0x0001);
239
240		if (info->enable_oc) {
241			desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
242			desc->wHubCharacteristics |=  cpu_to_le16(0x0008|0x0001);
243		}
244
245		dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
246			desc->wHubCharacteristics);
247
248		return ret;
249
250	case GetPortStatus:
251		/* check port status */
252
253		dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
254
255		if (valid_port(wIndex)) {
256			if (info->port[wIndex-1].oc_changed) {
257				*data |= cpu_to_le32(RH_PS_OCIC);
258			}
259
260			if (info->port[wIndex-1].oc_status) {
261				*data |= cpu_to_le32(RH_PS_POCI);
262			}
263		}
264	}
265
266 out:
267	return ret;
268}
269
270/* s3c2410_hcd_oc
271 *
272 * handle an over-current report
273*/
274
275static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc)
276{
277	struct s3c2410_hcd_port *port;
278	struct usb_hcd *hcd;
279	unsigned long flags;
280	int portno;
281
282	if (info == NULL)
283		return;
284
285	port = &info->port[0];
286	hcd = info->hcd;
287
288	local_irq_save(flags);
289
290	for (portno = 0; portno < 2; port++, portno++) {
291		if (port_oc & (1<<portno) &&
292		    port->flags & S3C_HCDFLG_USED) {
293			port->oc_status = 1;
294			port->oc_changed = 1;
295
296			/* ok, once over-current is detected,
297			   the port needs to be powered down */
298			s3c2410_usb_set_power(info, portno+1, 0);
299		}
300	}
301
302	local_irq_restore(flags);
303}
304
305/* may be called without controller electrically present */
306/* may be called with controller, bus, and devices active */
307
308/*
309 * usb_hcd_s3c2410_remove - shutdown processing for HCD
310 * @dev: USB Host Controller being removed
311 * Context: !in_interrupt()
312 *
313 * Reverses the effect of usb_hcd_3c2410_probe(), first invoking
314 * the HCD's stop() method.  It is always called from a thread
315 * context, normally "rmmod", "apmd", or something similar.
316 *
317*/
318
319void usb_hcd_s3c2410_remove (struct usb_hcd *hcd, struct platform_device *dev)
320{
321	usb_remove_hcd(hcd);
322	s3c2410_stop_hc(dev);
323	iounmap(hcd->regs);
324	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
325	usb_put_hcd(hcd);
326}
327
328/**
329 * usb_hcd_s3c2410_probe - initialize S3C2410-based HCDs
330 * Context: !in_interrupt()
331 *
332 * Allocates basic resources for this USB host controller, and
333 * then invokes the start() method for the HCD associated with it
334 * through the hotplug entry's driver_data.
335 *
336 */
337int usb_hcd_s3c2410_probe (const struct hc_driver *driver,
338			   struct platform_device *dev)
339{
340	struct usb_hcd *hcd = NULL;
341	int retval;
342
343	s3c2410_usb_set_power(dev->dev.platform_data, 1, 1);
344	s3c2410_usb_set_power(dev->dev.platform_data, 2, 1);
345
346	hcd = usb_create_hcd(driver, &dev->dev, "s3c24xx");
347	if (hcd == NULL)
348		return -ENOMEM;
349
350	hcd->rsrc_start = dev->resource[0].start;
351	hcd->rsrc_len   = dev->resource[0].end - dev->resource[0].start + 1;
352
353	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
354		dev_err(&dev->dev, "request_mem_region failed");
355		retval = -EBUSY;
356		goto err0;
357	}
358
359	clk = clk_get(NULL, "usb-host");
360	if (IS_ERR(clk)) {
361		dev_err(&dev->dev, "cannot get usb-host clock\n");
362		retval = -ENOENT;
363		goto err1;
364	}
365
366	s3c2410_start_hc(dev, hcd);
367
368	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
369	if (!hcd->regs) {
370		dev_err(&dev->dev, "ioremap failed\n");
371		retval = -ENOMEM;
372		goto err2;
373	}
374
375	ohci_hcd_init(hcd_to_ohci(hcd));
376
377	retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT);
378	if (retval != 0)
379		goto err2;
380
381	return 0;
382
383 err2:
384	s3c2410_stop_hc(dev);
385	iounmap(hcd->regs);
386	clk_put(clk);
387
388 err1:
389	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
390
391 err0:
392	usb_put_hcd(hcd);
393	return retval;
394}
395
396/*-------------------------------------------------------------------------*/
397
398static int
399ohci_s3c2410_start (struct usb_hcd *hcd)
400{
401	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
402	int ret;
403
404	if ((ret = ohci_init(ohci)) < 0)
405		return ret;
406
407	if ((ret = ohci_run (ohci)) < 0) {
408		err ("can't start %s", hcd->self.bus_name);
409		ohci_stop (hcd);
410		return ret;
411	}
412
413	return 0;
414}
415
416
417static const struct hc_driver ohci_s3c2410_hc_driver = {
418	.description =		hcd_name,
419	.product_desc =		"S3C24XX OHCI",
420	.hcd_priv_size =	sizeof(struct ohci_hcd),
421
422	/*
423	 * generic hardware linkage
424	 */
425	.irq =			ohci_irq,
426	.flags =		HCD_USB11 | HCD_MEMORY,
427
428	/*
429	 * basic lifecycle operations
430	 */
431	.start =		ohci_s3c2410_start,
432	.stop =			ohci_stop,
433
434	/*
435	 * managing i/o requests and associated device resources
436	 */
437	.urb_enqueue =		ohci_urb_enqueue,
438	.urb_dequeue =		ohci_urb_dequeue,
439	.endpoint_disable =	ohci_endpoint_disable,
440
441	/*
442	 * scheduling support
443	 */
444	.get_frame_number =	ohci_get_frame,
445
446	/*
447	 * root hub support
448	 */
449	.hub_status_data =	ohci_s3c2410_hub_status_data,
450	.hub_control =		ohci_s3c2410_hub_control,
451#ifdef	CONFIG_PM
452	.bus_suspend =		ohci_bus_suspend,
453	.bus_resume =		ohci_bus_resume,
454#endif
455	.start_port_reset =	ohci_start_port_reset,
456};
457
458/* device driver */
459
460static int ohci_hcd_s3c2410_drv_probe(struct platform_device *pdev)
461{
462	return usb_hcd_s3c2410_probe(&ohci_s3c2410_hc_driver, pdev);
463}
464
465static int ohci_hcd_s3c2410_drv_remove(struct platform_device *pdev)
466{
467	struct usb_hcd *hcd = platform_get_drvdata(pdev);
468
469	usb_hcd_s3c2410_remove(hcd, pdev);
470	return 0;
471}
472
473static struct platform_driver ohci_hcd_s3c2410_driver = {
474	.probe		= ohci_hcd_s3c2410_drv_probe,
475	.remove		= ohci_hcd_s3c2410_drv_remove,
476	/*.suspend	= ohci_hcd_s3c2410_drv_suspend, */
477	/*.resume	= ohci_hcd_s3c2410_drv_resume, */
478	.driver		= {
479		.owner	= THIS_MODULE,
480		.name	= "s3c2410-ohci",
481	},
482};
483
484static int __init ohci_hcd_s3c2410_init (void)
485{
486	return platform_driver_register(&ohci_hcd_s3c2410_driver);
487}
488
489static void __exit ohci_hcd_s3c2410_cleanup (void)
490{
491	platform_driver_unregister(&ohci_hcd_s3c2410_driver);
492}
493
494module_init (ohci_hcd_s3c2410_init);
495module_exit (ohci_hcd_s3c2410_cleanup);
496