Merge git://git.infradead.org/mtd-2.6
[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  * AT91RM9200 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/arch/board.h>
21
22 #ifndef CONFIG_ARCH_AT91RM9200
23 #error "CONFIG_ARCH_AT91RM9200 must be defined."
24 #endif
25
26 /* interface and function clocks */
27 static struct clk *iclk, *fclk;
28
29 extern int usb_disabled(void);
30
31 /*-------------------------------------------------------------------------*/
32
33 static void at91_start_hc(struct platform_device *pdev)
34 {
35         struct usb_hcd *hcd = platform_get_drvdata(pdev);
36         struct ohci_regs __iomem *regs = hcd->regs;
37
38         dev_dbg(&pdev->dev, "starting AT91RM9200 OHCI USB Controller\n");
39
40         /*
41          * Start the USB clocks.
42          */
43         clk_enable(iclk);
44         clk_enable(fclk);
45
46         /*
47          * The USB host controller must remain in reset.
48          */
49         writel(0, &regs->control);
50 }
51
52 static void at91_stop_hc(struct platform_device *pdev)
53 {
54         struct usb_hcd *hcd = platform_get_drvdata(pdev);
55         struct ohci_regs __iomem *regs = hcd->regs;
56
57         dev_dbg(&pdev->dev, "stopping AT91RM9200 OHCI USB Controller\n");
58
59         /*
60          * Put the USB host controller into reset.
61          */
62         writel(0, &regs->control);
63
64         /*
65          * Stop the USB clocks.
66          */
67         clk_disable(fclk);
68         clk_disable(iclk);
69 }
70
71
72 /*-------------------------------------------------------------------------*/
73
74 static int usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
75
76 /* configure so an HC device and id are always provided */
77 /* always called with process context; sleeping is OK */
78
79
80 /**
81  * usb_hcd_at91_probe - initialize AT91RM9200-based HCDs
82  * Context: !in_interrupt()
83  *
84  * Allocates basic resources for this USB host controller, and
85  * then invokes the start() method for the HCD associated with it
86  * through the hotplug entry's driver_data.
87  */
88 int usb_hcd_at91_probe (const struct hc_driver *driver, struct platform_device *pdev)
89 {
90         int retval;
91         struct usb_hcd *hcd = NULL;
92
93         if (pdev->num_resources != 2) {
94                 pr_debug("hcd probe: invalid num_resources");
95                 return -ENODEV;
96         }
97
98         if ((pdev->resource[0].flags != IORESOURCE_MEM) || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
99                 pr_debug("hcd probe: invalid resource type\n");
100                 return -ENODEV;
101         }
102
103         hcd = usb_create_hcd(driver, &pdev->dev, "at91rm9200");
104         if (!hcd)
105                 return -ENOMEM;
106         hcd->rsrc_start = pdev->resource[0].start;
107         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
108
109         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
110                 pr_debug("request_mem_region failed\n");
111                 retval = -EBUSY;
112                 goto err1;
113         }
114
115         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
116         if (!hcd->regs) {
117                 pr_debug("ioremap failed\n");
118                 retval = -EIO;
119                 goto err2;
120         }
121
122         iclk = clk_get(&pdev->dev, "ohci_clk");
123         fclk = clk_get(&pdev->dev, "uhpck");
124
125         at91_start_hc(pdev);
126         ohci_hcd_init(hcd_to_ohci(hcd));
127
128         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
129         if (retval == 0)
130                 return retval;
131
132         /* Error handling */
133         at91_stop_hc(pdev);
134
135         clk_put(fclk);
136         clk_put(iclk);
137
138         iounmap(hcd->regs);
139
140  err2:
141         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
142
143  err1:
144         usb_put_hcd(hcd);
145         return retval;
146 }
147
148
149 /* may be called with controller, bus, and devices active */
150
151 /**
152  * usb_hcd_at91_remove - shutdown processing for AT91RM9200-based HCDs
153  * @dev: USB Host Controller being removed
154  * Context: !in_interrupt()
155  *
156  * Reverses the effect of usb_hcd_at91_probe(), first invoking
157  * the HCD's stop() method.  It is always called from a thread
158  * context, normally "rmmod", "apmd", or something similar.
159  *
160  */
161 static int usb_hcd_at91_remove (struct usb_hcd *hcd, struct platform_device *pdev)
162 {
163         usb_remove_hcd(hcd);
164         at91_stop_hc(pdev);
165         iounmap(hcd->regs);
166         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
167
168         clk_put(fclk);
169         clk_put(iclk);
170         fclk = iclk = NULL;
171
172         dev_set_drvdata(&pdev->dev, NULL);
173         return 0;
174 }
175
176 /*-------------------------------------------------------------------------*/
177
178 static int __devinit
179 ohci_at91_start (struct usb_hcd *hcd)
180 {
181 //      struct at91_ohci_data   *board = hcd->self.controller->platform_data;
182         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
183         int                     ret;
184
185         if ((ret = ohci_init(ohci)) < 0)
186                 return ret;
187
188         if ((ret = ohci_run(ohci)) < 0) {
189                 err("can't start %s", hcd->self.bus_name);
190                 ohci_stop(hcd);
191                 return ret;
192         }
193 //      hcd->self.root_hub->maxchild = board->ports;
194         return 0;
195 }
196
197 /*-------------------------------------------------------------------------*/
198
199 static const struct hc_driver ohci_at91_hc_driver = {
200         .description =          hcd_name,
201         .product_desc =         "AT91RM9200 OHCI",
202         .hcd_priv_size =        sizeof(struct ohci_hcd),
203
204         /*
205          * generic hardware linkage
206          */
207         .irq =                  ohci_irq,
208         .flags =                HCD_USB11 | HCD_MEMORY,
209
210         /*
211          * basic lifecycle operations
212          */
213         .start =                ohci_at91_start,
214         .stop =                 ohci_stop,
215
216         /*
217          * managing i/o requests and associated device resources
218          */
219         .urb_enqueue =          ohci_urb_enqueue,
220         .urb_dequeue =          ohci_urb_dequeue,
221         .endpoint_disable =     ohci_endpoint_disable,
222
223         /*
224          * scheduling support
225          */
226         .get_frame_number =     ohci_get_frame,
227
228         /*
229          * root hub support
230          */
231         .hub_status_data =      ohci_hub_status_data,
232         .hub_control =          ohci_hub_control,
233
234 #ifdef CONFIG_PM
235         .bus_suspend =          ohci_bus_suspend,
236         .bus_resume =           ohci_bus_resume,
237 #endif
238         .start_port_reset =     ohci_start_port_reset,
239 };
240
241 /*-------------------------------------------------------------------------*/
242
243 static int ohci_hcd_at91_drv_probe(struct platform_device *dev)
244 {
245         return usb_hcd_at91_probe(&ohci_at91_hc_driver, dev);
246 }
247
248 static int ohci_hcd_at91_drv_remove(struct platform_device *dev)
249 {
250         return usb_hcd_at91_remove(platform_get_drvdata(dev), dev);
251 }
252
253 #ifdef CONFIG_PM
254
255 /* REVISIT suspend/resume look "too" simple here */
256
257 static int
258 ohci_hcd_at91_drv_suspend(struct platform_device *dev, pm_message_t mesg)
259 {
260         clk_disable(fclk);
261         clk_disable(iclk);
262
263         return 0;
264 }
265
266 static int ohci_hcd_at91_drv_resume(struct platform_device *dev)
267 {
268         clk_enable(iclk);
269         clk_enable(fclk);
270
271         return 0;
272 }
273 #else
274 #define ohci_hcd_at91_drv_suspend NULL
275 #define ohci_hcd_at91_drv_resume  NULL
276 #endif
277
278 MODULE_ALIAS("at91rm9200-ohci");
279
280 static struct platform_driver ohci_hcd_at91_driver = {
281         .probe          = ohci_hcd_at91_drv_probe,
282         .remove         = ohci_hcd_at91_drv_remove,
283         .suspend        = ohci_hcd_at91_drv_suspend,
284         .resume         = ohci_hcd_at91_drv_resume,
285         .driver         = {
286                 .name   = "at91rm9200-ohci",
287                 .owner  = THIS_MODULE,
288         },
289 };
290
291 static int __init ohci_hcd_at91_init (void)
292 {
293         if (usb_disabled())
294                 return -ENODEV;
295
296         return platform_driver_register(&ohci_hcd_at91_driver);
297 }
298
299 static void __exit ohci_hcd_at91_cleanup (void)
300 {
301         platform_driver_unregister(&ohci_hcd_at91_driver);
302 }
303
304 module_init (ohci_hcd_at91_init);
305 module_exit (ohci_hcd_at91_cleanup);