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PM: OMAP3: Removed a couple of unused variables from DVFS code
[linux-ginger.git] / drivers / usb / host / ohci-pxa27x.c
blobf1c06202fdf22d8630cc5647509a10c17a77bc97
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 pxa27x
9 *
10 * Written by Christopher Hoover <ch@hpl.hp.com>
11 * Based on fragments of previous driver by Russell King et al.
12 *
13 * Modified for LH7A404 from ohci-sa1111.c
14 * by Durgesh Pattamatta <pattamattad@sharpsec.com>
15 *
16 * Modified for pxa27x from ohci-lh7a404.c
17 * by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
18 *
19 * This file is licenced under the GPL.
20 */
21
22 #include <linux/device.h>
23 #include <linux/signal.h>
24 #include <linux/platform_device.h>
25 #include <linux/clk.h>
26 #include <mach/ohci.h>
27
28 /*
29 * UHC: USB Host Controller (OHCI-like) register definitions
30 */
31 #define UHCREV (0x0000) /* UHC HCI Spec Revision */
32 #define UHCHCON (0x0004) /* UHC Host Control Register */
33 #define UHCCOMS (0x0008) /* UHC Command Status Register */
34 #define UHCINTS (0x000C) /* UHC Interrupt Status Register */
35 #define UHCINTE (0x0010) /* UHC Interrupt Enable */
36 #define UHCINTD (0x0014) /* UHC Interrupt Disable */
37 #define UHCHCCA (0x0018) /* UHC Host Controller Comm. Area */
38 #define UHCPCED (0x001C) /* UHC Period Current Endpt Descr */
39 #define UHCCHED (0x0020) /* UHC Control Head Endpt Descr */
40 #define UHCCCED (0x0024) /* UHC Control Current Endpt Descr */
41 #define UHCBHED (0x0028) /* UHC Bulk Head Endpt Descr */
42 #define UHCBCED (0x002C) /* UHC Bulk Current Endpt Descr */
43 #define UHCDHEAD (0x0030) /* UHC Done Head */
44 #define UHCFMI (0x0034) /* UHC Frame Interval */
45 #define UHCFMR (0x0038) /* UHC Frame Remaining */
46 #define UHCFMN (0x003C) /* UHC Frame Number */
47 #define UHCPERS (0x0040) /* UHC Periodic Start */
48 #define UHCLS (0x0044) /* UHC Low Speed Threshold */
49
50 #define UHCRHDA (0x0048) /* UHC Root Hub Descriptor A */
51 #define UHCRHDA_NOCP (1 << 12) /* No over current protection */
52 #define UHCRHDA_OCPM (1 << 11) /* Over Current Protection Mode */
53 #define UHCRHDA_POTPGT(x) \
54 (((x) & 0xff) << 24) /* Power On To Power Good Time */
55
56 #define UHCRHDB (0x004C) /* UHC Root Hub Descriptor B */
57 #define UHCRHS (0x0050) /* UHC Root Hub Status */
58 #define UHCRHPS1 (0x0054) /* UHC Root Hub Port 1 Status */
59 #define UHCRHPS2 (0x0058) /* UHC Root Hub Port 2 Status */
60 #define UHCRHPS3 (0x005C) /* UHC Root Hub Port 3 Status */
61
62 #define UHCSTAT (0x0060) /* UHC Status Register */
63 #define UHCSTAT_UPS3 (1 << 16) /* USB Power Sense Port3 */
64 #define UHCSTAT_SBMAI (1 << 15) /* System Bus Master Abort Interrupt*/
65 #define UHCSTAT_SBTAI (1 << 14) /* System Bus Target Abort Interrupt*/
66 #define UHCSTAT_UPRI (1 << 13) /* USB Port Resume Interrupt */
67 #define UHCSTAT_UPS2 (1 << 12) /* USB Power Sense Port 2 */
68 #define UHCSTAT_UPS1 (1 << 11) /* USB Power Sense Port 1 */
69 #define UHCSTAT_HTA (1 << 10) /* HCI Target Abort */
70 #define UHCSTAT_HBA (1 << 8) /* HCI Buffer Active */
71 #define UHCSTAT_RWUE (1 << 7) /* HCI Remote Wake Up Event */
72
73 #define UHCHR (0x0064) /* UHC Reset Register */
74 #define UHCHR_SSEP3 (1 << 11) /* Sleep Standby Enable for Port3 */
75 #define UHCHR_SSEP2 (1 << 10) /* Sleep Standby Enable for Port2 */
76 #define UHCHR_SSEP1 (1 << 9) /* Sleep Standby Enable for Port1 */
77 #define UHCHR_PCPL (1 << 7) /* Power control polarity low */
78 #define UHCHR_PSPL (1 << 6) /* Power sense polarity low */
79 #define UHCHR_SSE (1 << 5) /* Sleep Standby Enable */
80 #define UHCHR_UIT (1 << 4) /* USB Interrupt Test */
81 #define UHCHR_SSDC (1 << 3) /* Simulation Scale Down Clock */
82 #define UHCHR_CGR (1 << 2) /* Clock Generation Reset */
83 #define UHCHR_FHR (1 << 1) /* Force Host Controller Reset */
84 #define UHCHR_FSBIR (1 << 0) /* Force System Bus Iface Reset */
85
86 #define UHCHIE (0x0068) /* UHC Interrupt Enable Register*/
87 #define UHCHIE_UPS3IE (1 << 14) /* Power Sense Port3 IntEn */
88 #define UHCHIE_UPRIE (1 << 13) /* Port Resume IntEn */
89 #define UHCHIE_UPS2IE (1 << 12) /* Power Sense Port2 IntEn */
90 #define UHCHIE_UPS1IE (1 << 11) /* Power Sense Port1 IntEn */
91 #define UHCHIE_TAIE (1 << 10) /* HCI Interface Transfer Abort
92 Interrupt Enable*/
93 #define UHCHIE_HBAIE (1 << 8) /* HCI Buffer Active IntEn */
94 #define UHCHIE_RWIE (1 << 7) /* Remote Wake-up IntEn */
95
96 #define UHCHIT (0x006C) /* UHC Interrupt Test register */
97
98 #define PXA_UHC_MAX_PORTNUM 3
99
100 struct pxa27x_ohci {
101 /* must be 1st member here for hcd_to_ohci() to work */
102 struct ohci_hcd ohci;
103
104 struct device *dev;
105 struct clk *clk;
106 void __iomem *mmio_base;
107 };
108
109 #define to_pxa27x_ohci(hcd) (struct pxa27x_ohci *)hcd_to_ohci(hcd)
110
111 /*
112 PMM_NPS_MODE -- PMM Non-power switching mode
113 Ports are powered continuously.
114
115 PMM_GLOBAL_MODE -- PMM global switching mode
116 All ports are powered at the same time.
117
118 PMM_PERPORT_MODE -- PMM per port switching mode
119 Ports are powered individually.
120 */
121 static int pxa27x_ohci_select_pmm(struct pxa27x_ohci *ohci, int mode)
122 {
123 uint32_t uhcrhda = __raw_readl(ohci->mmio_base + UHCRHDA);
124 uint32_t uhcrhdb = __raw_readl(ohci->mmio_base + UHCRHDB);
125
126 switch (mode) {
127 case PMM_NPS_MODE:
128 uhcrhda |= RH_A_NPS;
129 break;
130 case PMM_GLOBAL_MODE:
131 uhcrhda &= ~(RH_A_NPS & RH_A_PSM);
132 break;
133 case PMM_PERPORT_MODE:
134 uhcrhda &= ~(RH_A_NPS);
135 uhcrhda |= RH_A_PSM;
136
137 /* Set port power control mask bits, only 3 ports. */
138 uhcrhdb |= (0x7<<17);
139 break;
140 default:
141 printk( KERN_ERR
142 "Invalid mode %d, set to non-power switch mode.\n",
143 mode );
144
145 uhcrhda |= RH_A_NPS;
146 }
147
148 __raw_writel(uhcrhda, ohci->mmio_base + UHCRHDA);
149 __raw_writel(uhcrhdb, ohci->mmio_base + UHCRHDB);
150 return 0;
151 }
152
153 extern int usb_disabled(void);
154
155 /*-------------------------------------------------------------------------*/
156
157 static inline void pxa27x_setup_hc(struct pxa27x_ohci *ohci,
158 struct pxaohci_platform_data *inf)
159 {
160 uint32_t uhchr = __raw_readl(ohci->mmio_base + UHCHR);
161 uint32_t uhcrhda = __raw_readl(ohci->mmio_base + UHCRHDA);
162
163 if (inf->flags & ENABLE_PORT1)
164 uhchr &= ~UHCHR_SSEP1;
165
166 if (inf->flags & ENABLE_PORT2)
167 uhchr &= ~UHCHR_SSEP2;
168
169 if (inf->flags & ENABLE_PORT3)
170 uhchr &= ~UHCHR_SSEP3;
171
172 if (inf->flags & POWER_CONTROL_LOW)
173 uhchr |= UHCHR_PCPL;
174
175 if (inf->flags & POWER_SENSE_LOW)
176 uhchr |= UHCHR_PSPL;
177
178 if (inf->flags & NO_OC_PROTECTION)
179 uhcrhda |= UHCRHDA_NOCP;
180 else
181 uhcrhda &= ~UHCRHDA_NOCP;
182
183 if (inf->flags & OC_MODE_PERPORT)
184 uhcrhda |= UHCRHDA_OCPM;
185 else
186 uhcrhda &= ~UHCRHDA_OCPM;
187
188 if (inf->power_on_delay) {
189 uhcrhda &= ~UHCRHDA_POTPGT(0xff);
190 uhcrhda |= UHCRHDA_POTPGT(inf->power_on_delay / 2);
191 }
192
193 __raw_writel(uhchr, ohci->mmio_base + UHCHR);
194 __raw_writel(uhcrhda, ohci->mmio_base + UHCRHDA);
195 }
196
197 static inline void pxa27x_reset_hc(struct pxa27x_ohci *ohci)
198 {
199 uint32_t uhchr = __raw_readl(ohci->mmio_base + UHCHR);
200
201 __raw_writel(uhchr | UHCHR_FHR, ohci->mmio_base + UHCHR);
202 udelay(11);
203 __raw_writel(uhchr & ~UHCHR_FHR, ohci->mmio_base + UHCHR);
204 }
205
206 #ifdef CONFIG_CPU_PXA27x
207 extern void pxa27x_clear_otgph(void);
208 #else
209 #define pxa27x_clear_otgph() do {} while (0)
210 #endif
211
212 static int pxa27x_start_hc(struct pxa27x_ohci *ohci, struct device *dev)
213 {
214 int retval = 0;
215 struct pxaohci_platform_data *inf;
216 uint32_t uhchr;
217
218 inf = dev->platform_data;
219
220 clk_enable(ohci->clk);
221
222 pxa27x_reset_hc(ohci);
223
224 uhchr = __raw_readl(ohci->mmio_base + UHCHR) | UHCHR_FSBIR;
225 __raw_writel(uhchr, ohci->mmio_base + UHCHR);
226
227 while (__raw_readl(ohci->mmio_base + UHCHR) & UHCHR_FSBIR)
228 cpu_relax();
229
230 pxa27x_setup_hc(ohci, inf);
231
232 if (inf->init)
233 retval = inf->init(dev);
234
235 if (retval < 0)
236 return retval;
237
238 uhchr = __raw_readl(ohci->mmio_base + UHCHR) & ~UHCHR_SSE;
239 __raw_writel(uhchr, ohci->mmio_base + UHCHR);
240 __raw_writel(UHCHIE_UPRIE | UHCHIE_RWIE, ohci->mmio_base + UHCHIE);
241
242 /* Clear any OTG Pin Hold */
243 pxa27x_clear_otgph();
244 return 0;
245 }
246
247 static void pxa27x_stop_hc(struct pxa27x_ohci *ohci, struct device *dev)
248 {
249 struct pxaohci_platform_data *inf;
250 uint32_t uhccoms;
251
252 inf = dev->platform_data;
253
254 if (inf->exit)
255 inf->exit(dev);
256
257 pxa27x_reset_hc(ohci);
258
259 /* Host Controller Reset */
260 uhccoms = __raw_readl(ohci->mmio_base + UHCCOMS) | 0x01;
261 __raw_writel(uhccoms, ohci->mmio_base + UHCCOMS);
262 udelay(10);
263
264 clk_disable(ohci->clk);
265 }
266
267
268 /*-------------------------------------------------------------------------*/
269
270 /* configure so an HC device and id are always provided */
271 /* always called with process context; sleeping is OK */
272
273
274 /**
275 * usb_hcd_pxa27x_probe - initialize pxa27x-based HCDs
276 * Context: !in_interrupt()
277 *
278 * Allocates basic resources for this USB host controller, and
279 * then invokes the start() method for the HCD associated with it
280 * through the hotplug entry's driver_data.
281 *
282 */
283 int usb_hcd_pxa27x_probe (const struct hc_driver *driver, struct platform_device *pdev)
284 {
285 int retval, irq;
286 struct usb_hcd *hcd;
287 struct pxaohci_platform_data *inf;
288 struct pxa27x_ohci *ohci;
289 struct resource *r;
290 struct clk *usb_clk;
291
292 inf = pdev->dev.platform_data;
293
294 if (!inf)
295 return -ENODEV;
296
297 irq = platform_get_irq(pdev, 0);
298 if (irq < 0) {
299 pr_err("no resource of IORESOURCE_IRQ");
300 return -ENXIO;
301 }
302
303 usb_clk = clk_get(&pdev->dev, NULL);
304 if (IS_ERR(usb_clk))
305 return PTR_ERR(usb_clk);
306
307 hcd = usb_create_hcd (driver, &pdev->dev, "pxa27x");
308 if (!hcd)
309 return -ENOMEM;
310
311 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
312 if (!r) {
313 pr_err("no resource of IORESOURCE_MEM");
314 retval = -ENXIO;
315 goto err1;
316 }
317
318 hcd->rsrc_start = r->start;
319 hcd->rsrc_len = resource_size(r);
320
321 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
322 pr_debug("request_mem_region failed");
323 retval = -EBUSY;
324 goto err1;
325 }
326
327 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
328 if (!hcd->regs) {
329 pr_debug("ioremap failed");
330 retval = -ENOMEM;
331 goto err2;
332 }
333
334 /* initialize "struct pxa27x_ohci" */
335 ohci = (struct pxa27x_ohci *)hcd_to_ohci(hcd);
336 ohci->dev = &pdev->dev;
337 ohci->clk = usb_clk;
338 ohci->mmio_base = (void __iomem *)hcd->regs;
339
340 if ((retval = pxa27x_start_hc(ohci, &pdev->dev)) < 0) {
341 pr_debug("pxa27x_start_hc failed");
342 goto err3;
343 }
344
345 /* Select Power Management Mode */
346 pxa27x_ohci_select_pmm(ohci, inf->port_mode);
347
348 if (inf->power_budget)
349 hcd->power_budget = inf->power_budget;
350
351 ohci_hcd_init(hcd_to_ohci(hcd));
352
353 retval = usb_add_hcd(hcd, irq, IRQF_DISABLED);
354 if (retval == 0)
355 return retval;
356
357 pxa27x_stop_hc(ohci, &pdev->dev);
358 err3:
359 iounmap(hcd->regs);
360 err2:
361 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
362 err1:
363 usb_put_hcd(hcd);
364 clk_put(usb_clk);
365 return retval;
366 }
367
368
369 /* may be called without controller electrically present */
370 /* may be called with controller, bus, and devices active */
371
372 /**
373 * usb_hcd_pxa27x_remove - shutdown processing for pxa27x-based HCDs
374 * @dev: USB Host Controller being removed
375 * Context: !in_interrupt()
376 *
377 * Reverses the effect of usb_hcd_pxa27x_probe(), first invoking
378 * the HCD's stop() method. It is always called from a thread
379 * context, normally "rmmod", "apmd", or something similar.
380 *
381 */
382 void usb_hcd_pxa27x_remove (struct usb_hcd *hcd, struct platform_device *pdev)
383 {
384 struct pxa27x_ohci *ohci = to_pxa27x_ohci(hcd);
385
386 usb_remove_hcd(hcd);
387 pxa27x_stop_hc(ohci, &pdev->dev);
388 iounmap(hcd->regs);
389 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
390 usb_put_hcd(hcd);
391 clk_put(ohci->clk);
392 }
393
394 /*-------------------------------------------------------------------------*/
395
396 static int __devinit
397 ohci_pxa27x_start (struct usb_hcd *hcd)
398 {
399 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
400 int ret;
401
402 ohci_dbg (ohci, "ohci_pxa27x_start, ohci:%p", ohci);
403
404 /* The value of NDP in roothub_a is incorrect on this hardware */
405 ohci->num_ports = 3;
406
407 if ((ret = ohci_init(ohci)) < 0)
408 return ret;
409
410 if ((ret = ohci_run (ohci)) < 0) {
411 err ("can't start %s", hcd->self.bus_name);
412 ohci_stop (hcd);
413 return ret;
414 }
415
416 return 0;
417 }
418
419 /*-------------------------------------------------------------------------*/
420
421 static const struct hc_driver ohci_pxa27x_hc_driver = {
422 .description = hcd_name,
423 .product_desc = "PXA27x OHCI",
424 .hcd_priv_size = sizeof(struct pxa27x_ohci),
425
426 /*
427 * generic hardware linkage
428 */
429 .irq = ohci_irq,
430 .flags = HCD_USB11 | HCD_MEMORY,
431
432 /*
433 * basic lifecycle operations
434 */
435 .start = ohci_pxa27x_start,
436 .stop = ohci_stop,
437 .shutdown = ohci_shutdown,
438
439 /*
440 * managing i/o requests and associated device resources
441 */
442 .urb_enqueue = ohci_urb_enqueue,
443 .urb_dequeue = ohci_urb_dequeue,
444 .endpoint_disable = ohci_endpoint_disable,
445
446 /*
447 * scheduling support
448 */
449 .get_frame_number = ohci_get_frame,
450
451 /*
452 * root hub support
453 */
454 .hub_status_data = ohci_hub_status_data,
455 .hub_control = ohci_hub_control,
456 #ifdef CONFIG_PM
457 .bus_suspend = ohci_bus_suspend,
458 .bus_resume = ohci_bus_resume,
459 #endif
460 .start_port_reset = ohci_start_port_reset,
461 };
462
463 /*-------------------------------------------------------------------------*/
464
465 static int ohci_hcd_pxa27x_drv_probe(struct platform_device *pdev)
466 {
467 pr_debug ("In ohci_hcd_pxa27x_drv_probe");
468
469 if (usb_disabled())
470 return -ENODEV;
471
472 return usb_hcd_pxa27x_probe(&ohci_pxa27x_hc_driver, pdev);
473 }
474
475 static int ohci_hcd_pxa27x_drv_remove(struct platform_device *pdev)
476 {
477 struct usb_hcd *hcd = platform_get_drvdata(pdev);
478
479 usb_hcd_pxa27x_remove(hcd, pdev);
480 platform_set_drvdata(pdev, NULL);
481 return 0;
482 }
483
484 #ifdef CONFIG_PM
485 static int ohci_hcd_pxa27x_drv_suspend(struct device *dev)
486 {
487 struct usb_hcd *hcd = dev_get_drvdata(dev);
488 struct pxa27x_ohci *ohci = to_pxa27x_ohci(hcd);
489
490 if (time_before(jiffies, ohci->ohci.next_statechange))
491 msleep(5);
492 ohci->ohci.next_statechange = jiffies;
493
494 pxa27x_stop_hc(ohci, dev);
495 hcd->state = HC_STATE_SUSPENDED;
496
497 return 0;
498 }
499
500 static int ohci_hcd_pxa27x_drv_resume(struct device *dev)
501 {
502 struct usb_hcd *hcd = dev_get_drvdata(dev);
503 struct pxa27x_ohci *ohci = to_pxa27x_ohci(hcd);
504 struct pxaohci_platform_data *inf = dev->platform_data;
505 int status;
506
507 if (time_before(jiffies, ohci->ohci.next_statechange))
508 msleep(5);
509 ohci->ohci.next_statechange = jiffies;
510
511 if ((status = pxa27x_start_hc(ohci, dev)) < 0)
512 return status;
513
514 /* Select Power Management Mode */
515 pxa27x_ohci_select_pmm(ohci, inf->port_mode);
516
517 ohci_finish_controller_resume(hcd);
518 return 0;
519 }
520
521 static struct dev_pm_ops ohci_hcd_pxa27x_pm_ops = {
522 .suspend = ohci_hcd_pxa27x_drv_suspend,
523 .resume = ohci_hcd_pxa27x_drv_resume,
524 };
525 #endif
526
527 /* work with hotplug and coldplug */
528 MODULE_ALIAS("platform:pxa27x-ohci");
529
530 static struct platform_driver ohci_hcd_pxa27x_driver = {
531 .probe = ohci_hcd_pxa27x_drv_probe,
532 .remove = ohci_hcd_pxa27x_drv_remove,
533 .shutdown = usb_hcd_platform_shutdown,
534 .driver = {
535 .name = "pxa27x-ohci",
536 .owner = THIS_MODULE,
537 #ifdef CONFIG_PM
538 .pm = &ohci_hcd_pxa27x_pm_ops,
539 #endif
540 },
541 };
542
Linux for Ginger Game Console