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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 | * | |
0365ee0a | 7 | * AT91 Bus Glue |
39a269c0 AV |
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 | ||
a09e64fb | 18 | #include <mach/hardware.h> |
4bde4a4c DB |
19 | #include <asm/gpio.h> |
20 | ||
a09e64fb RK |
21 | #include <mach/board.h> |
22 | #include <mach/cpu.h> | |
39a269c0 | 23 | |
0365ee0a DB |
24 | #ifndef CONFIG_ARCH_AT91 |
25 | #error "CONFIG_ARCH_AT91 must be defined." | |
39a269c0 AV |
26 | #endif |
27 | ||
ed077bb7 AV |
28 | /* interface and function clocks; sometimes also an AHB clock */ |
29 | static struct clk *iclk, *fclk, *hclk; | |
0365ee0a | 30 | static int clocked; |
39a269c0 AV |
31 | |
32 | extern int usb_disabled(void); | |
33 | ||
34 | /*-------------------------------------------------------------------------*/ | |
35 | ||
ed077bb7 AV |
36 | static void at91_start_clock(void) |
37 | { | |
23f6d914 | 38 | if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) |
ed077bb7 AV |
39 | clk_enable(hclk); |
40 | clk_enable(iclk); | |
41 | clk_enable(fclk); | |
42 | clocked = 1; | |
43 | } | |
44 | ||
45 | static void at91_stop_clock(void) | |
46 | { | |
47 | clk_disable(fclk); | |
48 | clk_disable(iclk); | |
23f6d914 | 49 | if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) |
ed077bb7 AV |
50 | clk_disable(hclk); |
51 | clocked = 0; | |
52 | } | |
53 | ||
39a269c0 AV |
54 | static void at91_start_hc(struct platform_device *pdev) |
55 | { | |
56 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
57 | struct ohci_regs __iomem *regs = hcd->regs; | |
58 | ||
0365ee0a | 59 | dev_dbg(&pdev->dev, "start\n"); |
39a269c0 AV |
60 | |
61 | /* | |
62 | * Start the USB clocks. | |
63 | */ | |
ed077bb7 | 64 | at91_start_clock(); |
39a269c0 AV |
65 | |
66 | /* | |
67 | * The USB host controller must remain in reset. | |
68 | */ | |
69 | writel(0, ®s->control); | |
70 | } | |
71 | ||
72 | static void at91_stop_hc(struct platform_device *pdev) | |
73 | { | |
74 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
75 | struct ohci_regs __iomem *regs = hcd->regs; | |
76 | ||
0365ee0a | 77 | dev_dbg(&pdev->dev, "stop\n"); |
39a269c0 AV |
78 | |
79 | /* | |
80 | * Put the USB host controller into reset. | |
81 | */ | |
82 | writel(0, ®s->control); | |
83 | ||
84 | /* | |
85 | * Stop the USB clocks. | |
86 | */ | |
ed077bb7 | 87 | at91_stop_clock(); |
39a269c0 AV |
88 | } |
89 | ||
90 | ||
91 | /*-------------------------------------------------------------------------*/ | |
92 | ||
421b4bf5 | 93 | static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *); |
39a269c0 AV |
94 | |
95 | /* configure so an HC device and id are always provided */ | |
96 | /* always called with process context; sleeping is OK */ | |
97 | ||
98 | ||
99 | /** | |
0365ee0a | 100 | * usb_hcd_at91_probe - initialize AT91-based HCDs |
39a269c0 AV |
101 | * Context: !in_interrupt() |
102 | * | |
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. | |
39a269c0 | 106 | */ |
0365ee0a DB |
107 | static int usb_hcd_at91_probe(const struct hc_driver *driver, |
108 | struct platform_device *pdev) | |
39a269c0 AV |
109 | { |
110 | int retval; | |
111 | struct usb_hcd *hcd = NULL; | |
112 | ||
113 | if (pdev->num_resources != 2) { | |
114 | pr_debug("hcd probe: invalid num_resources"); | |
115 | return -ENODEV; | |
116 | } | |
117 | ||
0365ee0a DB |
118 | if ((pdev->resource[0].flags != IORESOURCE_MEM) |
119 | || (pdev->resource[1].flags != IORESOURCE_IRQ)) { | |
39a269c0 AV |
120 | pr_debug("hcd probe: invalid resource type\n"); |
121 | return -ENODEV; | |
122 | } | |
123 | ||
0365ee0a | 124 | hcd = usb_create_hcd(driver, &pdev->dev, "at91"); |
39a269c0 AV |
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; | |
129 | ||
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; | |
134 | } | |
135 | ||
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; | |
141 | } | |
142 | ||
143 | iclk = clk_get(&pdev->dev, "ohci_clk"); | |
144 | fclk = clk_get(&pdev->dev, "uhpck"); | |
23f6d914 | 145 | if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) |
ed077bb7 | 146 | hclk = clk_get(&pdev->dev, "hck0"); |
39a269c0 AV |
147 | |
148 | at91_start_hc(pdev); | |
149 | ohci_hcd_init(hcd_to_ohci(hcd)); | |
150 | ||
2f2cac3c | 151 | retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED); |
39a269c0 AV |
152 | if (retval == 0) |
153 | return retval; | |
154 | ||
155 | /* Error handling */ | |
156 | at91_stop_hc(pdev); | |
157 | ||
23f6d914 | 158 | if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) |
ed077bb7 | 159 | clk_put(hclk); |
39a269c0 AV |
160 | clk_put(fclk); |
161 | clk_put(iclk); | |
162 | ||
163 | iounmap(hcd->regs); | |
164 | ||
165 | err2: | |
166 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
167 | ||
168 | err1: | |
169 | usb_put_hcd(hcd); | |
170 | return retval; | |
171 | } | |
172 | ||
173 | ||
39a269c0 AV |
174 | /* may be called with controller, bus, and devices active */ |
175 | ||
176 | /** | |
0365ee0a | 177 | * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs |
39a269c0 AV |
178 | * @dev: USB Host Controller being removed |
179 | * Context: !in_interrupt() | |
180 | * | |
181 | * Reverses the effect of usb_hcd_at91_probe(), first invoking | |
182 | * the HCD's stop() method. It is always called from a thread | |
0365ee0a | 183 | * context, "rmmod" or something similar. |
39a269c0 AV |
184 | * |
185 | */ | |
421b4bf5 | 186 | static void usb_hcd_at91_remove(struct usb_hcd *hcd, |
0365ee0a | 187 | struct platform_device *pdev) |
39a269c0 AV |
188 | { |
189 | usb_remove_hcd(hcd); | |
190 | at91_stop_hc(pdev); | |
191 | iounmap(hcd->regs); | |
68ba61b8 | 192 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
421b4bf5 | 193 | usb_put_hcd(hcd); |
39a269c0 | 194 | |
23f6d914 | 195 | if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) |
ed077bb7 | 196 | clk_put(hclk); |
68ba61b8 DB |
197 | clk_put(fclk); |
198 | clk_put(iclk); | |
ed077bb7 | 199 | fclk = iclk = hclk = NULL; |
39a269c0 AV |
200 | |
201 | dev_set_drvdata(&pdev->dev, NULL); | |
39a269c0 AV |
202 | } |
203 | ||
204 | /*-------------------------------------------------------------------------*/ | |
205 | ||
206 | static int __devinit | |
207 | ohci_at91_start (struct usb_hcd *hcd) | |
208 | { | |
0365ee0a | 209 | struct at91_usbh_data *board = hcd->self.controller->platform_data; |
39a269c0 AV |
210 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
211 | int ret; | |
212 | ||
213 | if ((ret = ohci_init(ohci)) < 0) | |
214 | return ret; | |
215 | ||
cd22afda | 216 | ohci->num_ports = board->ports; |
0365ee0a | 217 | |
39a269c0 AV |
218 | if ((ret = ohci_run(ohci)) < 0) { |
219 | err("can't start %s", hcd->self.bus_name); | |
220 | ohci_stop(hcd); | |
221 | return ret; | |
222 | } | |
39a269c0 AV |
223 | return 0; |
224 | } | |
225 | ||
226 | /*-------------------------------------------------------------------------*/ | |
227 | ||
228 | static const struct hc_driver ohci_at91_hc_driver = { | |
229 | .description = hcd_name, | |
0365ee0a | 230 | .product_desc = "AT91 OHCI", |
39a269c0 AV |
231 | .hcd_priv_size = sizeof(struct ohci_hcd), |
232 | ||
233 | /* | |
234 | * generic hardware linkage | |
235 | */ | |
236 | .irq = ohci_irq, | |
237 | .flags = HCD_USB11 | HCD_MEMORY, | |
238 | ||
239 | /* | |
240 | * basic lifecycle operations | |
241 | */ | |
242 | .start = ohci_at91_start, | |
243 | .stop = ohci_stop, | |
dd9048af | 244 | .shutdown = ohci_shutdown, |
39a269c0 AV |
245 | |
246 | /* | |
247 | * managing i/o requests and associated device resources | |
248 | */ | |
249 | .urb_enqueue = ohci_urb_enqueue, | |
250 | .urb_dequeue = ohci_urb_dequeue, | |
251 | .endpoint_disable = ohci_endpoint_disable, | |
252 | ||
253 | /* | |
254 | * scheduling support | |
255 | */ | |
256 | .get_frame_number = ohci_get_frame, | |
257 | ||
258 | /* | |
259 | * root hub support | |
260 | */ | |
261 | .hub_status_data = ohci_hub_status_data, | |
262 | .hub_control = ohci_hub_control, | |
39a269c0 | 263 | #ifdef CONFIG_PM |
68ba61b8 DB |
264 | .bus_suspend = ohci_bus_suspend, |
265 | .bus_resume = ohci_bus_resume, | |
39a269c0 AV |
266 | #endif |
267 | .start_port_reset = ohci_start_port_reset, | |
268 | }; | |
269 | ||
270 | /*-------------------------------------------------------------------------*/ | |
271 | ||
0365ee0a | 272 | static int ohci_hcd_at91_drv_probe(struct platform_device *pdev) |
39a269c0 | 273 | { |
4bde4a4c DB |
274 | struct at91_usbh_data *pdata = pdev->dev.platform_data; |
275 | int i; | |
276 | ||
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. | |
282 | */ | |
3d6fdf75 | 283 | for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) { |
4bde4a4c DB |
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); | |
288 | } | |
289 | } | |
290 | ||
0365ee0a DB |
291 | device_init_wakeup(&pdev->dev, 1); |
292 | return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev); | |
39a269c0 AV |
293 | } |
294 | ||
0365ee0a | 295 | static int ohci_hcd_at91_drv_remove(struct platform_device *pdev) |
39a269c0 | 296 | { |
4bde4a4c DB |
297 | struct at91_usbh_data *pdata = pdev->dev.platform_data; |
298 | int i; | |
299 | ||
300 | if (pdata) { | |
3d6fdf75 | 301 | for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) { |
4bde4a4c DB |
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]); | |
306 | } | |
307 | } | |
308 | ||
0365ee0a | 309 | device_init_wakeup(&pdev->dev, 0); |
421b4bf5 PZ |
310 | usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev); |
311 | return 0; | |
39a269c0 AV |
312 | } |
313 | ||
314 | #ifdef CONFIG_PM | |
39a269c0 | 315 | |
68ba61b8 | 316 | static int |
0365ee0a | 317 | ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg) |
68ba61b8 | 318 | { |
0365ee0a DB |
319 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
320 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); | |
321 | ||
322 | if (device_may_wakeup(&pdev->dev)) | |
323 | enable_irq_wake(hcd->irq); | |
0365ee0a DB |
324 | |
325 | /* | |
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). | |
329 | * | |
330 | * REVISIT: some boards will be able to turn VBUS off... | |
331 | */ | |
332 | if (at91_suspend_entering_slow_clock()) { | |
333 | ohci_usb_reset (ohci); | |
ed077bb7 | 334 | at91_stop_clock(); |
0365ee0a | 335 | } |
39a269c0 AV |
336 | |
337 | return 0; | |
338 | } | |
339 | ||
0365ee0a | 340 | static int ohci_hcd_at91_drv_resume(struct platform_device *pdev) |
39a269c0 | 341 | { |
6dde896e MP |
342 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
343 | ||
344 | if (device_may_wakeup(&pdev->dev)) | |
345 | disable_irq_wake(hcd->irq); | |
346 | ||
ed077bb7 AV |
347 | if (!clocked) |
348 | at91_start_clock(); | |
39a269c0 | 349 | |
43bbb7e0 | 350 | ohci_finish_controller_resume(hcd); |
39a269c0 AV |
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 | ||
f4fce61d | 358 | MODULE_ALIAS("platform:at91_ohci"); |
68ba61b8 | 359 | |
39a269c0 AV |
360 | static struct platform_driver ohci_hcd_at91_driver = { |
361 | .probe = ohci_hcd_at91_drv_probe, | |
362 | .remove = ohci_hcd_at91_drv_remove, | |
64a21d02 | 363 | .shutdown = usb_hcd_platform_shutdown, |
39a269c0 AV |
364 | .suspend = ohci_hcd_at91_drv_suspend, |
365 | .resume = ohci_hcd_at91_drv_resume, | |
366 | .driver = { | |
0365ee0a | 367 | .name = "at91_ohci", |
39a269c0 AV |
368 | .owner = THIS_MODULE, |
369 | }, | |
370 | }; |