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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 | ||
18 | #include <asm/mach-types.h> | |
19 | #include <asm/hardware.h> | |
4bde4a4c DB |
20 | #include <asm/gpio.h> |
21 | ||
39a269c0 | 22 | #include <asm/arch/board.h> |
ed077bb7 | 23 | #include <asm/arch/cpu.h> |
39a269c0 | 24 | |
0365ee0a DB |
25 | #ifndef CONFIG_ARCH_AT91 |
26 | #error "CONFIG_ARCH_AT91 must be defined." | |
39a269c0 AV |
27 | #endif |
28 | ||
ed077bb7 AV |
29 | /* interface and function clocks; sometimes also an AHB clock */ |
30 | static struct clk *iclk, *fclk, *hclk; | |
0365ee0a | 31 | static int clocked; |
39a269c0 AV |
32 | |
33 | extern int usb_disabled(void); | |
34 | ||
35 | /*-------------------------------------------------------------------------*/ | |
36 | ||
ed077bb7 AV |
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 | ||
39a269c0 AV |
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 | ||
0365ee0a | 60 | dev_dbg(&pdev->dev, "start\n"); |
39a269c0 AV |
61 | |
62 | /* | |
63 | * Start the USB clocks. | |
64 | */ | |
ed077bb7 | 65 | at91_start_clock(); |
39a269c0 AV |
66 | |
67 | /* | |
68 | * The USB host controller must remain in reset. | |
69 | */ | |
70 | writel(0, ®s->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 | ||
0365ee0a | 78 | dev_dbg(&pdev->dev, "stop\n"); |
39a269c0 AV |
79 | |
80 | /* | |
81 | * Put the USB host controller into reset. | |
82 | */ | |
83 | writel(0, ®s->control); | |
84 | ||
85 | /* | |
86 | * Stop the USB clocks. | |
87 | */ | |
ed077bb7 | 88 | at91_stop_clock(); |
39a269c0 AV |
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 | /** | |
0365ee0a | 101 | * usb_hcd_at91_probe - initialize AT91-based HCDs |
39a269c0 AV |
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. | |
39a269c0 | 107 | */ |
0365ee0a DB |
108 | static int usb_hcd_at91_probe(const struct hc_driver *driver, |
109 | struct platform_device *pdev) | |
39a269c0 AV |
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 | ||
0365ee0a DB |
119 | if ((pdev->resource[0].flags != IORESOURCE_MEM) |
120 | || (pdev->resource[1].flags != IORESOURCE_IRQ)) { | |
39a269c0 AV |
121 | pr_debug("hcd probe: invalid resource type\n"); |
122 | return -ENODEV; | |
123 | } | |
124 | ||
0365ee0a | 125 | hcd = usb_create_hcd(driver, &pdev->dev, "at91"); |
39a269c0 AV |
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"); | |
ed077bb7 AV |
146 | if (cpu_is_at91sam9261()) |
147 | hclk = clk_get(&pdev->dev, "hck0"); | |
39a269c0 AV |
148 | |
149 | at91_start_hc(pdev); | |
150 | ohci_hcd_init(hcd_to_ohci(hcd)); | |
151 | ||
d54b5caa | 152 | retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED); |
39a269c0 AV |
153 | if (retval == 0) |
154 | return retval; | |
155 | ||
156 | /* Error handling */ | |
157 | at91_stop_hc(pdev); | |
158 | ||
ed077bb7 AV |
159 | if (cpu_is_at91sam9261()) |
160 | clk_put(hclk); | |
39a269c0 AV |
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 | ||
39a269c0 AV |
175 | /* may be called with controller, bus, and devices active */ |
176 | ||
177 | /** | |
0365ee0a | 178 | * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs |
39a269c0 AV |
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 | |
0365ee0a | 184 | * context, "rmmod" or something similar. |
39a269c0 AV |
185 | * |
186 | */ | |
0365ee0a DB |
187 | static int usb_hcd_at91_remove(struct usb_hcd *hcd, |
188 | struct platform_device *pdev) | |
39a269c0 AV |
189 | { |
190 | usb_remove_hcd(hcd); | |
191 | at91_stop_hc(pdev); | |
192 | iounmap(hcd->regs); | |
68ba61b8 | 193 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
39a269c0 | 194 | |
ed077bb7 AV |
195 | if (cpu_is_at91sam9261()) |
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); | |
202 | return 0; | |
203 | } | |
204 | ||
205 | /*-------------------------------------------------------------------------*/ | |
206 | ||
207 | static int __devinit | |
208 | ohci_at91_start (struct usb_hcd *hcd) | |
209 | { | |
0365ee0a | 210 | struct at91_usbh_data *board = hcd->self.controller->platform_data; |
39a269c0 AV |
211 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
212 | int ret; | |
213 | ||
214 | if ((ret = ohci_init(ohci)) < 0) | |
215 | return ret; | |
216 | ||
cd22afda | 217 | ohci->num_ports = board->ports; |
0365ee0a | 218 | |
39a269c0 AV |
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 | } | |
39a269c0 AV |
224 | return 0; |
225 | } | |
226 | ||
227 | /*-------------------------------------------------------------------------*/ | |
228 | ||
229 | static const struct hc_driver ohci_at91_hc_driver = { | |
230 | .description = hcd_name, | |
0365ee0a | 231 | .product_desc = "AT91 OHCI", |
39a269c0 AV |
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, | |
dd9048af | 245 | .shutdown = ohci_shutdown, |
39a269c0 AV |
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, | |
d413984a | 264 | .hub_irq_enable = ohci_rhsc_enable, |
39a269c0 | 265 | #ifdef CONFIG_PM |
68ba61b8 DB |
266 | .bus_suspend = ohci_bus_suspend, |
267 | .bus_resume = ohci_bus_resume, | |
39a269c0 AV |
268 | #endif |
269 | .start_port_reset = ohci_start_port_reset, | |
270 | }; | |
271 | ||
272 | /*-------------------------------------------------------------------------*/ | |
273 | ||
0365ee0a | 274 | static int ohci_hcd_at91_drv_probe(struct platform_device *pdev) |
39a269c0 | 275 | { |
4bde4a4c DB |
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 | ||
0365ee0a DB |
293 | device_init_wakeup(&pdev->dev, 1); |
294 | return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev); | |
39a269c0 AV |
295 | } |
296 | ||
0365ee0a | 297 | static int ohci_hcd_at91_drv_remove(struct platform_device *pdev) |
39a269c0 | 298 | { |
4bde4a4c DB |
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 | ||
0365ee0a DB |
311 | device_init_wakeup(&pdev->dev, 0); |
312 | return usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev); | |
39a269c0 AV |
313 | } |
314 | ||
315 | #ifdef CONFIG_PM | |
39a269c0 | 316 | |
68ba61b8 | 317 | static int |
0365ee0a | 318 | ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg) |
68ba61b8 | 319 | { |
0365ee0a DB |
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); | |
0365ee0a DB |
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); | |
ed077bb7 | 335 | at91_stop_clock(); |
0365ee0a | 336 | } |
39a269c0 AV |
337 | |
338 | return 0; | |
339 | } | |
340 | ||
0365ee0a | 341 | static int ohci_hcd_at91_drv_resume(struct platform_device *pdev) |
39a269c0 | 342 | { |
6dde896e MP |
343 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
344 | ||
345 | if (device_may_wakeup(&pdev->dev)) | |
346 | disable_irq_wake(hcd->irq); | |
347 | ||
ed077bb7 AV |
348 | if (!clocked) |
349 | at91_start_clock(); | |
39a269c0 AV |
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 | ||
0365ee0a | 358 | MODULE_ALIAS("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 | }; | |
371 |