Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw
[linux-2.6] / drivers / usb / host / ohci-at91.c
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 <asm/mach-types.h>
19 #include <asm/hardware.h>
20 #include <asm/gpio.h>
21
22 #include <asm/arch/board.h>
23 #include <asm/arch/cpu.h>
24
25 #ifndef CONFIG_ARCH_AT91
26 #error "CONFIG_ARCH_AT91 must be defined."
27 #endif
28
29 /* interface and function clocks; sometimes also an AHB clock */
30 static struct clk *iclk, *fclk, *hclk;
31 static int clocked;
32
33 extern int usb_disabled(void);
34
35 /*-------------------------------------------------------------------------*/
36
37 static void at91_start_clock(void)
38 {
39         if (cpu_is_at91sam9261())
40                 clk_enable(hclk);
41         clk_enable(iclk);
42         clk_enable(fclk);
43         clocked = 1;
44 }
45
46 static void at91_stop_clock(void)
47 {
48         clk_disable(fclk);
49         clk_disable(iclk);
50         if (cpu_is_at91sam9261())
51                 clk_disable(hclk);
52         clocked = 0;
53 }
54
55 static void at91_start_hc(struct platform_device *pdev)
56 {
57         struct usb_hcd *hcd = platform_get_drvdata(pdev);
58         struct ohci_regs __iomem *regs = hcd->regs;
59
60         dev_dbg(&pdev->dev, "start\n");
61
62         /*
63          * Start the USB clocks.
64          */
65         at91_start_clock();
66
67         /*
68          * The USB host controller must remain in reset.
69          */
70         writel(0, &regs->control);
71 }
72
73 static void at91_stop_hc(struct platform_device *pdev)
74 {
75         struct usb_hcd *hcd = platform_get_drvdata(pdev);
76         struct ohci_regs __iomem *regs = hcd->regs;
77
78         dev_dbg(&pdev->dev, "stop\n");
79
80         /*
81          * Put the USB host controller into reset.
82          */
83         writel(0, &regs->control);
84
85         /*
86          * Stop the USB clocks.
87          */
88         at91_stop_clock();
89 }
90
91
92 /*-------------------------------------------------------------------------*/
93
94 static int usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
95
96 /* configure so an HC device and id are always provided */
97 /* always called with process context; sleeping is OK */
98
99
100 /**
101  * usb_hcd_at91_probe - initialize AT91-based HCDs
102  * Context: !in_interrupt()
103  *
104  * Allocates basic resources for this USB host controller, and
105  * then invokes the start() method for the HCD associated with it
106  * through the hotplug entry's driver_data.
107  */
108 static int usb_hcd_at91_probe(const struct hc_driver *driver,
109                         struct platform_device *pdev)
110 {
111         int retval;
112         struct usb_hcd *hcd = NULL;
113
114         if (pdev->num_resources != 2) {
115                 pr_debug("hcd probe: invalid num_resources");
116                 return -ENODEV;
117         }
118
119         if ((pdev->resource[0].flags != IORESOURCE_MEM)
120                         || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
121                 pr_debug("hcd probe: invalid resource type\n");
122                 return -ENODEV;
123         }
124
125         hcd = usb_create_hcd(driver, &pdev->dev, "at91");
126         if (!hcd)
127                 return -ENOMEM;
128         hcd->rsrc_start = pdev->resource[0].start;
129         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
130
131         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
132                 pr_debug("request_mem_region failed\n");
133                 retval = -EBUSY;
134                 goto err1;
135         }
136
137         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
138         if (!hcd->regs) {
139                 pr_debug("ioremap failed\n");
140                 retval = -EIO;
141                 goto err2;
142         }
143
144         iclk = clk_get(&pdev->dev, "ohci_clk");
145         fclk = clk_get(&pdev->dev, "uhpck");
146         if (cpu_is_at91sam9261())
147                 hclk = clk_get(&pdev->dev, "hck0");
148
149         at91_start_hc(pdev);
150         ohci_hcd_init(hcd_to_ohci(hcd));
151
152         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
153         if (retval == 0)
154                 return retval;
155
156         /* Error handling */
157         at91_stop_hc(pdev);
158
159         if (cpu_is_at91sam9261())
160                 clk_put(hclk);
161         clk_put(fclk);
162         clk_put(iclk);
163
164         iounmap(hcd->regs);
165
166  err2:
167         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
168
169  err1:
170         usb_put_hcd(hcd);
171         return retval;
172 }
173
174
175 /* may be called with controller, bus, and devices active */
176
177 /**
178  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
179  * @dev: USB Host Controller being removed
180  * Context: !in_interrupt()
181  *
182  * Reverses the effect of usb_hcd_at91_probe(), first invoking
183  * the HCD's stop() method.  It is always called from a thread
184  * context, "rmmod" or something similar.
185  *
186  */
187 static int usb_hcd_at91_remove(struct usb_hcd *hcd,
188                                 struct platform_device *pdev)
189 {
190         usb_remove_hcd(hcd);
191         at91_stop_hc(pdev);
192         iounmap(hcd->regs);
193         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
194
195         if (cpu_is_at91sam9261())
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         return 0;
203 }
204
205 /*-------------------------------------------------------------------------*/
206
207 static int __devinit
208 ohci_at91_start (struct usb_hcd *hcd)
209 {
210         struct at91_usbh_data   *board = hcd->self.controller->platform_data;
211         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
212         int                     ret;
213
214         if ((ret = ohci_init(ohci)) < 0)
215                 return ret;
216
217         ohci->num_ports = board->ports;
218
219         if ((ret = ohci_run(ohci)) < 0) {
220                 err("can't start %s", hcd->self.bus_name);
221                 ohci_stop(hcd);
222                 return ret;
223         }
224         return 0;
225 }
226
227 /*-------------------------------------------------------------------------*/
228
229 static const struct hc_driver ohci_at91_hc_driver = {
230         .description =          hcd_name,
231         .product_desc =         "AT91 OHCI",
232         .hcd_priv_size =        sizeof(struct ohci_hcd),
233
234         /*
235          * generic hardware linkage
236          */
237         .irq =                  ohci_irq,
238         .flags =                HCD_USB11 | HCD_MEMORY,
239
240         /*
241          * basic lifecycle operations
242          */
243         .start =                ohci_at91_start,
244         .stop =                 ohci_stop,
245         .shutdown =             ohci_shutdown,
246
247         /*
248          * managing i/o requests and associated device resources
249          */
250         .urb_enqueue =          ohci_urb_enqueue,
251         .urb_dequeue =          ohci_urb_dequeue,
252         .endpoint_disable =     ohci_endpoint_disable,
253
254         /*
255          * scheduling support
256          */
257         .get_frame_number =     ohci_get_frame,
258
259         /*
260          * root hub support
261          */
262         .hub_status_data =      ohci_hub_status_data,
263         .hub_control =          ohci_hub_control,
264         .hub_irq_enable =       ohci_rhsc_enable,
265 #ifdef CONFIG_PM
266         .bus_suspend =          ohci_bus_suspend,
267         .bus_resume =           ohci_bus_resume,
268 #endif
269         .start_port_reset =     ohci_start_port_reset,
270 };
271
272 /*-------------------------------------------------------------------------*/
273
274 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
275 {
276         struct at91_usbh_data   *pdata = pdev->dev.platform_data;
277         int                     i;
278
279         if (pdata) {
280                 /* REVISIT make the driver support per-port power switching,
281                  * and also overcurrent detection.  Here we assume the ports
282                  * are always powered while this driver is active, and use
283                  * active-low power switches.
284                  */
285                 for (i = 0; i < pdata->ports; i++) {
286                         if (pdata->vbus_pin[i] <= 0)
287                                 continue;
288                         gpio_request(pdata->vbus_pin[i], "ohci_vbus");
289                         gpio_direction_output(pdata->vbus_pin[i], 0);
290                 }
291         }
292
293         device_init_wakeup(&pdev->dev, 1);
294         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
295 }
296
297 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
298 {
299         struct at91_usbh_data   *pdata = pdev->dev.platform_data;
300         int                     i;
301
302         if (pdata) {
303                 for (i = 0; i < pdata->ports; i++) {
304                         if (pdata->vbus_pin[i] <= 0)
305                                 continue;
306                         gpio_direction_output(pdata->vbus_pin[i], 1);
307                         gpio_free(pdata->vbus_pin[i]);
308                 }
309         }
310
311         device_init_wakeup(&pdev->dev, 0);
312         return usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
313 }
314
315 #ifdef CONFIG_PM
316
317 static int
318 ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
319 {
320         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
321         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
322
323         if (device_may_wakeup(&pdev->dev))
324                 enable_irq_wake(hcd->irq);
325
326         /*
327          * The integrated transceivers seem unable to notice disconnect,
328          * reconnect, or wakeup without the 48 MHz clock active.  so for
329          * correctness, always discard connection state (using reset).
330          *
331          * REVISIT: some boards will be able to turn VBUS off...
332          */
333         if (at91_suspend_entering_slow_clock()) {
334                 ohci_usb_reset (ohci);
335                 at91_stop_clock();
336         }
337
338         return 0;
339 }
340
341 static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
342 {
343         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
344
345         if (device_may_wakeup(&pdev->dev))
346                 disable_irq_wake(hcd->irq);
347
348         if (!clocked)
349                 at91_start_clock();
350
351         return 0;
352 }
353 #else
354 #define ohci_hcd_at91_drv_suspend NULL
355 #define ohci_hcd_at91_drv_resume  NULL
356 #endif
357
358 MODULE_ALIAS("platform:at91_ohci");
359
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,
369         },
370 };