Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-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 "This file is AT91RM9200 bus glue.  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  * Store this function in the HCD's struct pci_driver as probe().
89  */
90 int usb_hcd_at91_probe (const struct hc_driver *driver, struct platform_device *pdev)
91 {
92         int retval;
93         struct usb_hcd *hcd = NULL;
94
95         if (pdev->num_resources != 2) {
96                 pr_debug("hcd probe: invalid num_resources");
97                 return -ENODEV;
98         }
99
100         if ((pdev->resource[0].flags != IORESOURCE_MEM) || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
101                 pr_debug("hcd probe: invalid resource type\n");
102                 return -ENODEV;
103         }
104
105         hcd = usb_create_hcd(driver, &pdev->dev, "at91rm9200");
106         if (!hcd)
107                 return -ENOMEM;
108         hcd->rsrc_start = pdev->resource[0].start;
109         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
110
111         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
112                 pr_debug("request_mem_region failed\n");
113                 retval = -EBUSY;
114                 goto err1;
115         }
116
117         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
118         if (!hcd->regs) {
119                 pr_debug("ioremap failed\n");
120                 retval = -EIO;
121                 goto err2;
122         }
123
124         iclk = clk_get(&pdev->dev, "ohci_clk");
125         fclk = clk_get(&pdev->dev, "uhpck");
126
127         at91_start_hc(pdev);
128         ohci_hcd_init(hcd_to_ohci(hcd));
129
130         retval = usb_add_hcd(hcd, pdev->resource[1].start, SA_INTERRUPT);
131         if (retval == 0)
132                 return retval;
133
134         /* Error handling */
135         at91_stop_hc(pdev);
136
137         clk_put(fclk);
138         clk_put(iclk);
139
140         iounmap(hcd->regs);
141
142  err2:
143         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
144
145  err1:
146         usb_put_hcd(hcd);
147         return retval;
148 }
149
150
151 /* may be called without controller electrically present */
152 /* may be called with controller, bus, and devices active */
153
154 /**
155  * usb_hcd_at91_remove - shutdown processing for AT91RM9200-based HCDs
156  * @dev: USB Host Controller being removed
157  * Context: !in_interrupt()
158  *
159  * Reverses the effect of usb_hcd_at91_probe(), first invoking
160  * the HCD's stop() method.  It is always called from a thread
161  * context, normally "rmmod", "apmd", or something similar.
162  *
163  */
164 static int usb_hcd_at91_remove (struct usb_hcd *hcd, struct platform_device *pdev)
165 {
166         usb_remove_hcd(hcd);
167         at91_stop_hc(pdev);
168         iounmap(hcd->regs);
169         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
170
171         clk_put(fclk);
172         clk_put(iclk);
173         fclk = iclk = NULL;
174
175         dev_set_drvdata(&pdev->dev, NULL);
176         return 0;
177 }
178
179 /*-------------------------------------------------------------------------*/
180
181 static int __devinit
182 ohci_at91_start (struct usb_hcd *hcd)
183 {
184 //      struct at91_ohci_data   *board = hcd->self.controller->platform_data;
185         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
186         int                     ret;
187
188         if ((ret = ohci_init(ohci)) < 0)
189                 return ret;
190
191         if ((ret = ohci_run(ohci)) < 0) {
192                 err("can't start %s", hcd->self.bus_name);
193                 ohci_stop(hcd);
194                 return ret;
195         }
196 //      hcd->self.root_hub->maxchild = board->ports;
197         return 0;
198 }
199
200 /*-------------------------------------------------------------------------*/
201
202 static const struct hc_driver ohci_at91_hc_driver = {
203         .description =          hcd_name,
204         .product_desc =         "AT91RM9200 OHCI",
205         .hcd_priv_size =        sizeof(struct ohci_hcd),
206
207         /*
208          * generic hardware linkage
209          */
210         .irq =                  ohci_irq,
211         .flags =                HCD_USB11 | HCD_MEMORY,
212
213         /*
214          * basic lifecycle operations
215          */
216         .start =                ohci_at91_start,
217         .stop =                 ohci_stop,
218
219         /*
220          * managing i/o requests and associated device resources
221          */
222         .urb_enqueue =          ohci_urb_enqueue,
223         .urb_dequeue =          ohci_urb_dequeue,
224         .endpoint_disable =     ohci_endpoint_disable,
225
226         /*
227          * scheduling support
228          */
229         .get_frame_number =     ohci_get_frame,
230
231         /*
232          * root hub support
233          */
234         .hub_status_data =      ohci_hub_status_data,
235         .hub_control =          ohci_hub_control,
236
237 #ifdef CONFIG_PM
238         .hub_suspend =          ohci_hub_suspend,
239         .hub_resume =           ohci_hub_resume,
240 #endif
241         .start_port_reset =     ohci_start_port_reset,
242 };
243
244 /*-------------------------------------------------------------------------*/
245
246 static int ohci_hcd_at91_drv_probe(struct platform_device *dev)
247 {
248         return usb_hcd_at91_probe(&ohci_at91_hc_driver, dev);
249 }
250
251 static int ohci_hcd_at91_drv_remove(struct platform_device *dev)
252 {
253         return usb_hcd_at91_remove(platform_get_drvdata(dev), dev);
254 }
255
256 #ifdef CONFIG_PM
257 static int ohci_hcd_at91_drv_suspend(struct platform_device *dev, u32 state, u32 level)
258 {
259         printk("%s(%s:%d): not implemented yet\n",
260                 __func__, __FILE__, __LINE__);
261
262         clk_disable(fclk);
263
264         return 0;
265 }
266
267 static int ohci_hcd_at91_drv_resume(struct platform_device *dev, u32 state)
268 {
269         printk("%s(%s:%d): not implemented yet\n",
270                 __func__, __FILE__, __LINE__);
271
272         clk_enable(fclk);
273
274         return 0;
275 }
276 #else
277 #define ohci_hcd_at91_drv_suspend NULL
278 #define ohci_hcd_at91_drv_resume  NULL
279 #endif
280
281 static struct platform_driver ohci_hcd_at91_driver = {
282         .probe          = ohci_hcd_at91_drv_probe,
283         .remove         = ohci_hcd_at91_drv_remove,
284         .suspend        = ohci_hcd_at91_drv_suspend,
285         .resume         = ohci_hcd_at91_drv_resume,
286         .driver         = {
287                 .name   = "at91rm9200-ohci",
288                 .owner  = THIS_MODULE,
289         },
290 };
291
292 static int __init ohci_hcd_at91_init (void)
293 {
294         if (usb_disabled())
295                 return -ENODEV;
296
297         return platform_driver_register(&ohci_hcd_at91_driver);
298 }
299
300 static void __exit ohci_hcd_at91_cleanup (void)
301 {
302         platform_driver_unregister(&ohci_hcd_at91_driver);
303 }
304
305 module_init (ohci_hcd_at91_init);
306 module_exit (ohci_hcd_at91_cleanup);