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/drivers/usb/host/ohci-at91.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 372 lines | 220 code | 71 blank | 81 comment | 33 complexity | 3823a25beff83ddb51f4dc82875b7399 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  1/*
  2 * OHCI HCD (Host Controller Driver) for USB.
  3 *
  4 *  Copyright (C) 2004 SAN People (Pty) Ltd.
  5 *  Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
  6 *
  7 * AT91 Bus Glue
  8 *
  9 * Based on fragments of 2.4 driver by Rick Bronson.
 10 * Based on ohci-omap.c
 11 *
 12 * This file is licenced under the GPL.
 13 */
 14
 15#include <linux/clk.h>
 16#include <linux/platform_device.h>
 17
 18#include <mach/hardware.h>
 19#include <asm/gpio.h>
 20
 21#include <mach/board.h>
 22#include <mach/cpu.h>
 23
 24#ifndef CONFIG_ARCH_AT91
 25#error "CONFIG_ARCH_AT91 must be defined."
 26#endif
 27
 28/* interface and function clocks; sometimes also an AHB clock */
 29static struct clk *iclk, *fclk, *hclk;
 30static int clocked;
 31
 32extern int usb_disabled(void);
 33
 34/*-------------------------------------------------------------------------*/
 35
 36static void at91_start_clock(void)
 37{
 38	if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
 39		clk_enable(hclk);
 40	clk_enable(iclk);
 41	clk_enable(fclk);
 42	clocked = 1;
 43}
 44
 45static void at91_stop_clock(void)
 46{
 47	clk_disable(fclk);
 48	clk_disable(iclk);
 49	if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
 50		clk_disable(hclk);
 51	clocked = 0;
 52}
 53
 54static void at91_start_hc(struct platform_device *pdev)
 55{
 56	struct usb_hcd *hcd = platform_get_drvdata(pdev);
 57	struct ohci_regs __iomem *regs = hcd->regs;
 58
 59	dev_dbg(&pdev->dev, "start\n");
 60
 61	/*
 62	 * Start the USB clocks.
 63	 */
 64	at91_start_clock();
 65
 66	/*
 67	 * The USB host controller must remain in reset.
 68	 */
 69	writel(0, &regs->control);
 70}
 71
 72static void at91_stop_hc(struct platform_device *pdev)
 73{
 74	struct usb_hcd *hcd = platform_get_drvdata(pdev);
 75	struct ohci_regs __iomem *regs = hcd->regs;
 76
 77	dev_dbg(&pdev->dev, "stop\n");
 78
 79	/*
 80	 * Put the USB host controller into reset.
 81	 */
 82	writel(0, &regs->control);
 83
 84	/*
 85	 * Stop the USB clocks.
 86	 */
 87	at91_stop_clock();
 88}
 89
 90
 91/*-------------------------------------------------------------------------*/
 92
 93static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
 94
 95/* configure so an HC device and id are always provided */
 96/* always called with process context; sleeping is OK */
 97
 98
 99/**
100 * usb_hcd_at91_probe - initialize AT91-based HCDs
101 * Context: !in_interrupt()
102 *
103 * Allocates basic resources for this USB host controller, and
104 * then invokes the start() method for the HCD associated with it
105 * through the hotplug entry's driver_data.
106 */
107static int usb_hcd_at91_probe(const struct hc_driver *driver,
108			struct platform_device *pdev)
109{
110	int retval;
111	struct usb_hcd *hcd = NULL;
112
113	if (pdev->num_resources != 2) {
114		pr_debug("hcd probe: invalid num_resources");
115		return -ENODEV;
116	}
117
118	if ((pdev->resource[0].flags != IORESOURCE_MEM)
119			|| (pdev->resource[1].flags != IORESOURCE_IRQ)) {
120		pr_debug("hcd probe: invalid resource type\n");
121		return -ENODEV;
122	}
123
124	hcd = usb_create_hcd(driver, &pdev->dev, "at91");
125	if (!hcd)
126		return -ENOMEM;
127	hcd->rsrc_start = pdev->resource[0].start;
128	hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
129
130	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
131		pr_debug("request_mem_region failed\n");
132		retval = -EBUSY;
133		goto err1;
134	}
135
136	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
137	if (!hcd->regs) {
138		pr_debug("ioremap failed\n");
139		retval = -EIO;
140		goto err2;
141	}
142
143	iclk = clk_get(&pdev->dev, "ohci_clk");
144	fclk = clk_get(&pdev->dev, "uhpck");
145	if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
146		hclk = clk_get(&pdev->dev, "hck0");
147
148	at91_start_hc(pdev);
149	ohci_hcd_init(hcd_to_ohci(hcd));
150
151	retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
152	if (retval == 0)
153		return retval;
154
155	/* Error handling */
156	at91_stop_hc(pdev);
157
158	if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
159		clk_put(hclk);
160	clk_put(fclk);
161	clk_put(iclk);
162
163	iounmap(hcd->regs);
164
165 err2:
166	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
167
168 err1:
169	usb_put_hcd(hcd);
170	return retval;
171}
172
173
174/* may be called with controller, bus, and devices active */
175
176/**
177 * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
178 * @dev: USB Host Controller being removed
179 * Context: !in_interrupt()
180 *
181 * Reverses the effect of usb_hcd_at91_probe(), first invoking
182 * the HCD's stop() method.  It is always called from a thread
183 * context, "rmmod" or something similar.
184 *
185 */
186static void usb_hcd_at91_remove(struct usb_hcd *hcd,
187				struct platform_device *pdev)
188{
189	usb_remove_hcd(hcd);
190	at91_stop_hc(pdev);
191	iounmap(hcd->regs);
192	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
193	usb_put_hcd(hcd);
194
195	if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
196		clk_put(hclk);
197	clk_put(fclk);
198	clk_put(iclk);
199	fclk = iclk = hclk = NULL;
200
201	dev_set_drvdata(&pdev->dev, NULL);
202}
203
204/*-------------------------------------------------------------------------*/
205
206static int __devinit
207ohci_at91_start (struct usb_hcd *hcd)
208{
209	struct at91_usbh_data	*board = hcd->self.controller->platform_data;
210	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
211	int			ret;
212
213	if ((ret = ohci_init(ohci)) < 0)
214		return ret;
215
216	ohci->num_ports = board->ports;
217
218	if ((ret = ohci_run(ohci)) < 0) {
219		err("can't start %s", hcd->self.bus_name);
220		ohci_stop(hcd);
221		return ret;
222	}
223	return 0;
224}
225
226/*-------------------------------------------------------------------------*/
227
228static const struct hc_driver ohci_at91_hc_driver = {
229	.description =		hcd_name,
230	.product_desc =		"AT91 OHCI",
231	.hcd_priv_size =	sizeof(struct ohci_hcd),
232
233	/*
234	 * generic hardware linkage
235	 */
236	.irq =			ohci_irq,
237	.flags =		HCD_USB11 | HCD_MEMORY,
238
239	/*
240	 * basic lifecycle operations
241	 */
242	.start =		ohci_at91_start,
243	.stop =			ohci_stop,
244	.shutdown =		ohci_shutdown,
245
246	/*
247	 * managing i/o requests and associated device resources
248	 */
249	.urb_enqueue =		ohci_urb_enqueue,
250	.urb_dequeue =		ohci_urb_dequeue,
251	.endpoint_disable =	ohci_endpoint_disable,
252
253	/*
254	 * scheduling support
255	 */
256	.get_frame_number =	ohci_get_frame,
257
258	/*
259	 * root hub support
260	 */
261	.hub_status_data =	ohci_hub_status_data,
262	.hub_control =		ohci_hub_control,
263#ifdef CONFIG_PM
264	.bus_suspend =		ohci_bus_suspend,
265	.bus_resume =		ohci_bus_resume,
266#endif
267	.start_port_reset =	ohci_start_port_reset,
268};
269
270/*-------------------------------------------------------------------------*/
271
272static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
273{
274	struct at91_usbh_data	*pdata = pdev->dev.platform_data;
275	int			i;
276
277	if (pdata) {
278		/* REVISIT make the driver support per-port power switching,
279		 * and also overcurrent detection.  Here we assume the ports
280		 * are always powered while this driver is active, and use
281		 * active-low power switches.
282		 */
283		for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
284			if (pdata->vbus_pin[i] <= 0)
285				continue;
286			gpio_request(pdata->vbus_pin[i], "ohci_vbus");
287			gpio_direction_output(pdata->vbus_pin[i], 0);
288		}
289	}
290
291	device_init_wakeup(&pdev->dev, 1);
292	return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
293}
294
295static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
296{
297	struct at91_usbh_data	*pdata = pdev->dev.platform_data;
298	int			i;
299
300	if (pdata) {
301		for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
302			if (pdata->vbus_pin[i] <= 0)
303				continue;
304			gpio_direction_output(pdata->vbus_pin[i], 1);
305			gpio_free(pdata->vbus_pin[i]);
306		}
307	}
308
309	device_init_wakeup(&pdev->dev, 0);
310	usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
311	return 0;
312}
313
314#ifdef CONFIG_PM
315
316static int
317ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
318{
319	struct usb_hcd	*hcd = platform_get_drvdata(pdev);
320	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
321
322	if (device_may_wakeup(&pdev->dev))
323		enable_irq_wake(hcd->irq);
324
325	/*
326	 * The integrated transceivers seem unable to notice disconnect,
327	 * reconnect, or wakeup without the 48 MHz clock active.  so for
328	 * correctness, always discard connection state (using reset).
329	 *
330	 * REVISIT: some boards will be able to turn VBUS off...
331	 */
332	if (at91_suspend_entering_slow_clock()) {
333		ohci_usb_reset (ohci);
334		/* flush the writes */
335		(void) ohci_readl (ohci, &ohci->regs->control);
336		at91_stop_clock();
337	}
338
339	return 0;
340}
341
342static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
343{
344	struct usb_hcd	*hcd = platform_get_drvdata(pdev);
345
346	if (device_may_wakeup(&pdev->dev))
347		disable_irq_wake(hcd->irq);
348
349	if (!clocked)
350		at91_start_clock();
351
352	ohci_finish_controller_resume(hcd);
353	return 0;
354}
355#else
356#define ohci_hcd_at91_drv_suspend NULL
357#define ohci_hcd_at91_drv_resume  NULL
358#endif
359
360MODULE_ALIAS("platform:at91_ohci");
361
362static struct platform_driver ohci_hcd_at91_driver = {
363	.probe		= ohci_hcd_at91_drv_probe,
364	.remove		= ohci_hcd_at91_drv_remove,
365	.shutdown	= usb_hcd_platform_shutdown,
366	.suspend	= ohci_hcd_at91_drv_suspend,
367	.resume		= ohci_hcd_at91_drv_resume,
368	.driver		= {
369		.name	= "at91_ohci",
370		.owner	= THIS_MODULE,
371	},
372};