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39a269c0 AV |
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, ®s->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, ®s->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); |