USB: modifications for at91sam9g10
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / host / ohci-at91.c
blob68b83ab70719aa8b76f79d7b766625cc991cbe4c
1 /*
2 * OHCI HCD (Host Controller Driver) for USB.
4 * Copyright (C) 2004 SAN People (Pty) Ltd.
5 * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
7 * AT91 Bus Glue
9 * Based on fragments of 2.4 driver by Rick Bronson.
10 * Based on ohci-omap.c
12 * This file is licenced under the GPL.
15 #include <linux/clk.h>
16 #include <linux/platform_device.h>
18 #include <mach/hardware.h>
19 #include <asm/gpio.h>
21 #include <mach/board.h>
22 #include <mach/cpu.h>
24 #ifndef CONFIG_ARCH_AT91
25 #error "CONFIG_ARCH_AT91 must be defined."
26 #endif
28 /* interface and function clocks; sometimes also an AHB clock */
29 static struct clk *iclk, *fclk, *hclk;
30 static int clocked;
32 extern int usb_disabled(void);
34 /*-------------------------------------------------------------------------*/
36 static void at91_start_clock(void)
38 if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
39 clk_enable(hclk);
40 clk_enable(iclk);
41 clk_enable(fclk);
42 clocked = 1;
45 static void at91_stop_clock(void)
47 clk_disable(fclk);
48 clk_disable(iclk);
49 if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
50 clk_disable(hclk);
51 clocked = 0;
54 static void at91_start_hc(struct platform_device *pdev)
56 struct usb_hcd *hcd = platform_get_drvdata(pdev);
57 struct ohci_regs __iomem *regs = hcd->regs;
59 dev_dbg(&pdev->dev, "start\n");
62 * Start the USB clocks.
64 at91_start_clock();
67 * The USB host controller must remain in reset.
69 writel(0, &regs->control);
72 static void at91_stop_hc(struct platform_device *pdev)
74 struct usb_hcd *hcd = platform_get_drvdata(pdev);
75 struct ohci_regs __iomem *regs = hcd->regs;
77 dev_dbg(&pdev->dev, "stop\n");
80 * Put the USB host controller into reset.
82 writel(0, &regs->control);
85 * Stop the USB clocks.
87 at91_stop_clock();
91 /*-------------------------------------------------------------------------*/
93 static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
95 /* configure so an HC device and id are always provided */
96 /* always called with process context; sleeping is OK */
99 /**
100 * usb_hcd_at91_probe - initialize AT91-based HCDs
101 * Context: !in_interrupt()
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.
107 static int usb_hcd_at91_probe(const struct hc_driver *driver,
108 struct platform_device *pdev)
110 int retval;
111 struct usb_hcd *hcd = NULL;
113 if (pdev->num_resources != 2) {
114 pr_debug("hcd probe: invalid num_resources");
115 return -ENODEV;
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;
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;
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;
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;
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");
148 at91_start_hc(pdev);
149 ohci_hcd_init(hcd_to_ohci(hcd));
151 retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
152 if (retval == 0)
153 return retval;
155 /* Error handling */
156 at91_stop_hc(pdev);
158 if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
159 clk_put(hclk);
160 clk_put(fclk);
161 clk_put(iclk);
163 iounmap(hcd->regs);
165 err2:
166 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
168 err1:
169 usb_put_hcd(hcd);
170 return retval;
174 /* may be called with controller, bus, and devices active */
177 * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
178 * @dev: USB Host Controller being removed
179 * Context: !in_interrupt()
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.
186 static void usb_hcd_at91_remove(struct usb_hcd *hcd,
187 struct platform_device *pdev)
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);
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;
201 dev_set_drvdata(&pdev->dev, NULL);
204 /*-------------------------------------------------------------------------*/
206 static int __devinit
207 ohci_at91_start (struct usb_hcd *hcd)
209 struct at91_usbh_data *board = hcd->self.controller->platform_data;
210 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
211 int ret;
213 if ((ret = ohci_init(ohci)) < 0)
214 return ret;
216 ohci->num_ports = board->ports;
218 if ((ret = ohci_run(ohci)) < 0) {
219 err("can't start %s", hcd->self.bus_name);
220 ohci_stop(hcd);
221 return ret;
223 return 0;
226 /*-------------------------------------------------------------------------*/
228 static 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),
234 * generic hardware linkage
236 .irq = ohci_irq,
237 .flags = HCD_USB11 | HCD_MEMORY,
240 * basic lifecycle operations
242 .start = ohci_at91_start,
243 .stop = ohci_stop,
244 .shutdown = ohci_shutdown,
247 * managing i/o requests and associated device resources
249 .urb_enqueue = ohci_urb_enqueue,
250 .urb_dequeue = ohci_urb_dequeue,
251 .endpoint_disable = ohci_endpoint_disable,
254 * scheduling support
256 .get_frame_number = ohci_get_frame,
259 * root hub support
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,
270 /*-------------------------------------------------------------------------*/
272 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
274 struct at91_usbh_data *pdata = pdev->dev.platform_data;
275 int i;
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.
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);
291 device_init_wakeup(&pdev->dev, 1);
292 return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
295 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
297 struct at91_usbh_data *pdata = pdev->dev.platform_data;
298 int i;
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]);
309 device_init_wakeup(&pdev->dev, 0);
310 usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
311 return 0;
314 #ifdef CONFIG_PM
316 static int
317 ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
319 struct usb_hcd *hcd = platform_get_drvdata(pdev);
320 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
322 if (device_may_wakeup(&pdev->dev))
323 enable_irq_wake(hcd->irq);
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).
330 * REVISIT: some boards will be able to turn VBUS off...
332 if (at91_suspend_entering_slow_clock()) {
333 ohci_usb_reset (ohci);
334 at91_stop_clock();
337 return 0;
340 static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
342 struct usb_hcd *hcd = platform_get_drvdata(pdev);
344 if (device_may_wakeup(&pdev->dev))
345 disable_irq_wake(hcd->irq);
347 if (!clocked)
348 at91_start_clock();
350 ohci_finish_controller_resume(hcd);
351 return 0;
353 #else
354 #define ohci_hcd_at91_drv_suspend NULL
355 #define ohci_hcd_at91_drv_resume NULL
356 #endif
358 MODULE_ALIAS("platform:at91_ohci");
360 static struct platform_driver ohci_hcd_at91_driver = {
361 .probe = ohci_hcd_at91_drv_probe,
362 .remove = ohci_hcd_at91_drv_remove,
363 .shutdown = usb_hcd_platform_shutdown,
364 .suspend = ohci_hcd_at91_drv_suspend,
365 .resume = ohci_hcd_at91_drv_resume,
366 .driver = {
367 .name = "at91_ohci",
368 .owner = THIS_MODULE,