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Documentation: configfs examples crash fix
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / host / ohci-tmio.c
blob3558491dd87d5eaae84df78fc15e0348382eaaf4
1 /*
2 * OHCI HCD(Host Controller Driver) for USB.
3 *
4 *(C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 *(C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
6 *(C) Copyright 2002 Hewlett-Packard Company
7 *
8 * Bus glue for Toshiba Mobile IO(TMIO) Controller's OHCI core
9 * (C) Copyright 2005 Chris Humbert <mahadri-usb@drigon.com>
10 * (C) Copyright 2007, 2008 Dmitry Baryshkov <dbaryshkov@gmail.com>
11 *
12 * This is known to work with the following variants:
13 * TC6393XB revision 3 (32kB SRAM)
14 *
15 * The TMIO's OHCI core DMAs through a small internal buffer that
16 * is directly addressable by the CPU.
17 *
18 * Written from sparse documentation from Toshiba and Sharp's driver
19 * for the 2.4 kernel,
20 * usb-ohci-tc6393.c(C) Copyright 2004 Lineo Solutions, Inc.
21 *
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License version 2 as
24 * published by the Free Software Foundation.
25 */
26
27 /*#include <linux/fs.h>
28 #include <linux/mount.h>
29 #include <linux/pagemap.h>
30 #include <linux/init.h>
31 #include <linux/namei.h>
32 #include <linux/sched.h>*/
33 #include <linux/platform_device.h>
34 #include <linux/mfd/core.h>
35 #include <linux/mfd/tmio.h>
36 #include <linux/dma-mapping.h>
37
38 /*-------------------------------------------------------------------------*/
39
40 /*
41 * USB Host Controller Configuration Register
42 */
43 #define CCR_REVID 0x08 /* b Revision ID */
44 #define CCR_BASE 0x10 /* l USB Control Register Base Address Low */
45 #define CCR_ILME 0x40 /* b Internal Local Memory Enable */
46 #define CCR_PM 0x4c /* w Power Management */
47 #define CCR_INTC 0x50 /* b INT Control */
48 #define CCR_LMW1L 0x54 /* w Local Memory Window 1 LMADRS Low */
49 #define CCR_LMW1H 0x56 /* w Local Memory Window 1 LMADRS High */
50 #define CCR_LMW1BL 0x58 /* w Local Memory Window 1 Base Address Low */
51 #define CCR_LMW1BH 0x5A /* w Local Memory Window 1 Base Address High */
52 #define CCR_LMW2L 0x5C /* w Local Memory Window 2 LMADRS Low */
53 #define CCR_LMW2H 0x5E /* w Local Memory Window 2 LMADRS High */
54 #define CCR_LMW2BL 0x60 /* w Local Memory Window 2 Base Address Low */
55 #define CCR_LMW2BH 0x62 /* w Local Memory Window 2 Base Address High */
56 #define CCR_MISC 0xFC /* b MISC */
57
58 #define CCR_PM_GKEN 0x0001
59 #define CCR_PM_CKRNEN 0x0002
60 #define CCR_PM_USBPW1 0x0004
61 #define CCR_PM_USBPW2 0x0008
62 #define CCR_PM_USBPW3 0x0008
63 #define CCR_PM_PMEE 0x0100
64 #define CCR_PM_PMES 0x8000
65
66 /*-------------------------------------------------------------------------*/
67
68 struct tmio_hcd {
69 void __iomem *ccr;
70 spinlock_t lock; /* protects RMW cycles */
71 };
72
73 #define hcd_to_tmio(hcd) ((struct tmio_hcd *)(hcd_to_ohci(hcd) + 1))
74
75 /*-------------------------------------------------------------------------*/
76
77 static void tmio_write_pm(struct platform_device *dev)
78 {
79 struct usb_hcd *hcd = platform_get_drvdata(dev);
80 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
81 u16 pm;
82 unsigned long flags;
83
84 spin_lock_irqsave(&tmio->lock, flags);
85
86 pm = CCR_PM_GKEN | CCR_PM_CKRNEN |
87 CCR_PM_PMEE | CCR_PM_PMES;
88
89 tmio_iowrite16(pm, tmio->ccr + CCR_PM);
90 spin_unlock_irqrestore(&tmio->lock, flags);
91 }
92
93 static void tmio_stop_hc(struct platform_device *dev)
94 {
95 struct usb_hcd *hcd = platform_get_drvdata(dev);
96 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
97 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
98 u16 pm;
99
100 pm = CCR_PM_GKEN | CCR_PM_CKRNEN;
101 switch (ohci->num_ports) {
102 default:
103 dev_err(&dev->dev, "Unsupported amount of ports: %d\n", ohci->num_ports);
104 case 3:
105 pm |= CCR_PM_USBPW3;
106 case 2:
107 pm |= CCR_PM_USBPW2;
108 case 1:
109 pm |= CCR_PM_USBPW1;
110 }
111 tmio_iowrite8(0, tmio->ccr + CCR_INTC);
112 tmio_iowrite8(0, tmio->ccr + CCR_ILME);
113 tmio_iowrite16(0, tmio->ccr + CCR_BASE);
114 tmio_iowrite16(0, tmio->ccr + CCR_BASE + 2);
115 tmio_iowrite16(pm, tmio->ccr + CCR_PM);
116 }
117
118 static void tmio_start_hc(struct platform_device *dev)
119 {
120 struct usb_hcd *hcd = platform_get_drvdata(dev);
121 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
122 unsigned long base = hcd->rsrc_start;
123
124 tmio_write_pm(dev);
125 tmio_iowrite16(base, tmio->ccr + CCR_BASE);
126 tmio_iowrite16(base >> 16, tmio->ccr + CCR_BASE + 2);
127 tmio_iowrite8(1, tmio->ccr + CCR_ILME);
128 tmio_iowrite8(2, tmio->ccr + CCR_INTC);
129
130 dev_info(&dev->dev, "revision %d @ 0x%08llx, irq %d\n",
131 tmio_ioread8(tmio->ccr + CCR_REVID), hcd->rsrc_start, hcd->irq);
132 }
133
134 static int ohci_tmio_start(struct usb_hcd *hcd)
135 {
136 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
137 int ret;
138
139 if ((ret = ohci_init(ohci)) < 0)
140 return ret;
141
142 if ((ret = ohci_run(ohci)) < 0) {
143 err("can't start %s", hcd->self.bus_name);
144 ohci_stop(hcd);
145 return ret;
146 }
147
148 return 0;
149 }
150
151 static const struct hc_driver ohci_tmio_hc_driver = {
152 .description = hcd_name,
153 .product_desc = "TMIO OHCI USB Host Controller",
154 .hcd_priv_size = sizeof(struct ohci_hcd) + sizeof (struct tmio_hcd),
155
156 /* generic hardware linkage */
157 .irq = ohci_irq,
158 .flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
159
160 /* basic lifecycle operations */
161 .start = ohci_tmio_start,
162 .stop = ohci_stop,
163 .shutdown = ohci_shutdown,
164
165 /* managing i/o requests and associated device resources */
166 .urb_enqueue = ohci_urb_enqueue,
167 .urb_dequeue = ohci_urb_dequeue,
168 .endpoint_disable = ohci_endpoint_disable,
169
170 /* scheduling support */
171 .get_frame_number = ohci_get_frame,
172
173 /* root hub support */
174 .hub_status_data = ohci_hub_status_data,
175 .hub_control = ohci_hub_control,
176 #ifdef CONFIG_PM
177 .bus_suspend = ohci_bus_suspend,
178 .bus_resume = ohci_bus_resume,
179 #endif
180 .start_port_reset = ohci_start_port_reset,
181 };
182
183 /*-------------------------------------------------------------------------*/
184 static struct platform_driver ohci_hcd_tmio_driver;
185
186 static int __devinit ohci_hcd_tmio_drv_probe(struct platform_device *dev)
187 {
188 const struct mfd_cell *cell = mfd_get_cell(dev);
189 struct resource *regs = platform_get_resource(dev, IORESOURCE_MEM, 0);
190 struct resource *config = platform_get_resource(dev, IORESOURCE_MEM, 1);
191 struct resource *sram = platform_get_resource(dev, IORESOURCE_MEM, 2);
192 int irq = platform_get_irq(dev, 0);
193 struct tmio_hcd *tmio;
194 struct ohci_hcd *ohci;
195 struct usb_hcd *hcd;
196 int ret;
197
198 if (usb_disabled())
199 return -ENODEV;
200
201 if (!cell)
202 return -EINVAL;
203
204 hcd = usb_create_hcd(&ohci_tmio_hc_driver, &dev->dev, dev_name(&dev->dev));
205 if (!hcd) {
206 ret = -ENOMEM;
207 goto err_usb_create_hcd;
208 }
209
210 hcd->rsrc_start = regs->start;
211 hcd->rsrc_len = regs->end - regs->start + 1;
212
213 tmio = hcd_to_tmio(hcd);
214
215 spin_lock_init(&tmio->lock);
216
217 tmio->ccr = ioremap(config->start, config->end - config->start + 1);
218 if (!tmio->ccr) {
219 ret = -ENOMEM;
220 goto err_ioremap_ccr;
221 }
222
223 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
224 if (!hcd->regs) {
225 ret = -ENOMEM;
226 goto err_ioremap_regs;
227 }
228
229 if (!dma_declare_coherent_memory(&dev->dev, sram->start,
230 sram->start,
231 sram->end - sram->start + 1,
232 DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE)) {
233 ret = -EBUSY;
234 goto err_dma_declare;
235 }
236
237 if (cell->enable) {
238 ret = cell->enable(dev);
239 if (ret)
240 goto err_enable;
241 }
242
243 tmio_start_hc(dev);
244 ohci = hcd_to_ohci(hcd);
245 ohci_hcd_init(ohci);
246
247 ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
248 if (ret)
249 goto err_add_hcd;
250
251 if (ret == 0)
252 return ret;
253
254 usb_remove_hcd(hcd);
255
256 err_add_hcd:
257 tmio_stop_hc(dev);
258 if (cell->disable)
259 cell->disable(dev);
260 err_enable:
261 dma_release_declared_memory(&dev->dev);
262 err_dma_declare:
263 iounmap(hcd->regs);
264 err_ioremap_regs:
265 iounmap(tmio->ccr);
266 err_ioremap_ccr:
267 usb_put_hcd(hcd);
268 err_usb_create_hcd:
269
270 return ret;
271 }
272
273 static int __devexit ohci_hcd_tmio_drv_remove(struct platform_device *dev)
274 {
275 struct usb_hcd *hcd = platform_get_drvdata(dev);
276 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
277 const struct mfd_cell *cell = mfd_get_cell(dev);
278
279 usb_remove_hcd(hcd);
280 tmio_stop_hc(dev);
281 if (cell->disable)
282 cell->disable(dev);
283 dma_release_declared_memory(&dev->dev);
284 iounmap(hcd->regs);
285 iounmap(tmio->ccr);
286 usb_put_hcd(hcd);
287
288 platform_set_drvdata(dev, NULL);
289
290 return 0;
291 }
292
293 #ifdef CONFIG_PM
294 static int ohci_hcd_tmio_drv_suspend(struct platform_device *dev, pm_message_t state)
295 {
296 const struct mfd_cell *cell = mfd_get_cell(dev);
297 struct usb_hcd *hcd = platform_get_drvdata(dev);
298 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
299 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
300 unsigned long flags;
301 u8 misc;
302 int ret;
303
304 if (time_before(jiffies, ohci->next_statechange))
305 msleep(5);
306 ohci->next_statechange = jiffies;
307
308 spin_lock_irqsave(&tmio->lock, flags);
309
310 misc = tmio_ioread8(tmio->ccr + CCR_MISC);
311 misc |= 1 << 3; /* USSUSP */
312 tmio_iowrite8(misc, tmio->ccr + CCR_MISC);
313
314 spin_unlock_irqrestore(&tmio->lock, flags);
315
316 if (cell->suspend) {
317 ret = cell->suspend(dev);
318 if (ret)
319 return ret;
320 }
321
322 hcd->state = HC_STATE_SUSPENDED;
323
324 return 0;
325 }
326
327 static int ohci_hcd_tmio_drv_resume(struct platform_device *dev)
328 {
329 const struct mfd_cell *cell = mfd_get_cell(dev);
330 struct usb_hcd *hcd = platform_get_drvdata(dev);
331 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
332 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
333 unsigned long flags;
334 u8 misc;
335 int ret;
336
337 if (time_before(jiffies, ohci->next_statechange))
338 msleep(5);
339 ohci->next_statechange = jiffies;
340
341 if (cell->resume) {
342 ret = cell->resume(dev);
343 if (ret)
344 return ret;
345 }
346
347 tmio_start_hc(dev);
348
349 spin_lock_irqsave(&tmio->lock, flags);
350
351 misc = tmio_ioread8(tmio->ccr + CCR_MISC);
352 misc &= ~(1 << 3); /* USSUSP */
353 tmio_iowrite8(misc, tmio->ccr + CCR_MISC);
354
355 spin_unlock_irqrestore(&tmio->lock, flags);
356
357 ohci_finish_controller_resume(hcd);
358
359 return 0;
360 }
361 #else
362 #define ohci_hcd_tmio_drv_suspend NULL
363 #define ohci_hcd_tmio_drv_resume NULL
364 #endif
365
366 static struct platform_driver ohci_hcd_tmio_driver = {
367 .probe = ohci_hcd_tmio_drv_probe,
368 .remove = __devexit_p(ohci_hcd_tmio_drv_remove),
369 .shutdown = usb_hcd_platform_shutdown,
370 .suspend = ohci_hcd_tmio_drv_suspend,
371 .resume = ohci_hcd_tmio_drv_resume,
372 .driver = {
373 .name = "tmio-ohci",
374 .owner = THIS_MODULE,
375 },
376 };
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