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Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec...
[karo-tx-linux.git] / drivers / usb / host / ohci-da8xx.c
1 /*
2  * OHCI HCD (Host Controller Driver) for USB.
3  *
4  * TI DA8xx (OMAP-L1x) Bus Glue
5  *
6  * Derived from: ohci-omap.c and ohci-s3c2410.c
7  * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
8  *
9  * This file is licensed under the terms of the GNU General Public License
10  * version 2. This program is licensed "as is" without any warranty of any
11  * kind, whether express or implied.
12  */
13
14 #include <linux/interrupt.h>
15 #include <linux/jiffies.h>
16 #include <linux/platform_device.h>
17 #include <linux/clk.h>
18
19 #include <mach/da8xx.h>
20 #include <mach/usb.h>
21
22 #ifndef CONFIG_ARCH_DAVINCI_DA8XX
23 #error "This file is DA8xx bus glue.  Define CONFIG_ARCH_DAVINCI_DA8XX."
24 #endif
25
26 #define CFGCHIP2        DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG)
27
28 static struct clk *usb11_clk;
29 static struct clk *usb20_clk;
30
31 /* Over-current indicator change bitmask */
32 static volatile u16 ocic_mask;
33
34 static void ohci_da8xx_clock(int on)
35 {
36         u32 cfgchip2;
37
38         cfgchip2 = __raw_readl(CFGCHIP2);
39         if (on) {
40                 clk_enable(usb11_clk);
41
42                 /*
43                  * If USB 1.1 reference clock is sourced from USB 2.0 PHY, we
44                  * need to enable the USB 2.0 module clocking, start its PHY,
45                  * and not allow it to stop the clock during USB 2.0 suspend.
46                  */
47                 if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX)) {
48                         clk_enable(usb20_clk);
49
50                         cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN);
51                         cfgchip2 |= CFGCHIP2_PHY_PLLON;
52                         __raw_writel(cfgchip2, CFGCHIP2);
53
54                         pr_info("Waiting for USB PHY clock good...\n");
55                         while (!(__raw_readl(CFGCHIP2) & CFGCHIP2_PHYCLKGD))
56                                 cpu_relax();
57                 }
58
59                 /* Enable USB 1.1 PHY */
60                 cfgchip2 |= CFGCHIP2_USB1SUSPENDM;
61         } else {
62                 clk_disable(usb11_clk);
63                 if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX))
64                         clk_disable(usb20_clk);
65
66                 /* Disable USB 1.1 PHY */
67                 cfgchip2 &= ~CFGCHIP2_USB1SUSPENDM;
68         }
69         __raw_writel(cfgchip2, CFGCHIP2);
70 }
71
72 /*
73  * Handle the port over-current indicator change.
74  */
75 static void ohci_da8xx_ocic_handler(struct da8xx_ohci_root_hub *hub,
76                                     unsigned port)
77 {
78         ocic_mask |= 1 << port;
79
80         /* Once over-current is detected, the port needs to be powered down */
81         if (hub->get_oci(port) > 0)
82                 hub->set_power(port, 0);
83 }
84
85 static int ohci_da8xx_init(struct usb_hcd *hcd)
86 {
87         struct device *dev              = hcd->self.controller;
88         struct da8xx_ohci_root_hub *hub = dev->platform_data;
89         struct ohci_hcd *ohci           = hcd_to_ohci(hcd);
90         int result;
91         u32 rh_a;
92
93         dev_dbg(dev, "starting USB controller\n");
94
95         ohci_da8xx_clock(1);
96
97         /*
98          * DA8xx only have 1 port connected to the pins but the HC root hub
99          * register A reports 2 ports, thus we'll have to override it...
100          */
101         ohci->num_ports = 1;
102
103         result = ohci_init(ohci);
104         if (result < 0)
105                 return result;
106
107         /*
108          * Since we're providing a board-specific root hub port power control
109          * and over-current reporting, we have to override the HC root hub A
110          * register's default value, so that ohci_hub_control() could return
111          * the correct hub descriptor...
112          */
113         rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
114         if (hub->set_power) {
115                 rh_a &= ~RH_A_NPS;
116                 rh_a |=  RH_A_PSM;
117         }
118         if (hub->get_oci) {
119                 rh_a &= ~RH_A_NOCP;
120                 rh_a |=  RH_A_OCPM;
121         }
122         rh_a &= ~RH_A_POTPGT;
123         rh_a |= hub->potpgt << 24;
124         ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
125
126         return result;
127 }
128
129 static void ohci_da8xx_stop(struct usb_hcd *hcd)
130 {
131         ohci_stop(hcd);
132         ohci_da8xx_clock(0);
133 }
134
135 static int ohci_da8xx_start(struct usb_hcd *hcd)
136 {
137         struct ohci_hcd *ohci           = hcd_to_ohci(hcd);
138         int result;
139
140         result = ohci_run(ohci);
141         if (result < 0)
142                 ohci_da8xx_stop(hcd);
143
144         return result;
145 }
146
147 /*
148  * Update the status data from the hub with the over-current indicator change.
149  */
150 static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf)
151 {
152         int length              = ohci_hub_status_data(hcd, buf);
153
154         /* See if we have OCIC bit set on port 1 */
155         if (ocic_mask & (1 << 1)) {
156                 dev_dbg(hcd->self.controller, "over-current indicator change "
157                         "on port 1\n");
158
159                 if (!length)
160                         length = 1;
161
162                 buf[0] |= 1 << 1;
163         }
164         return length;
165 }
166
167 /*
168  * Look at the control requests to the root hub and see if we need to override.
169  */
170 static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
171                                   u16 wIndex, char *buf, u16 wLength)
172 {
173         struct device *dev              = hcd->self.controller;
174         struct da8xx_ohci_root_hub *hub = dev->platform_data;
175         int temp;
176
177         switch (typeReq) {
178         case GetPortStatus:
179                 /* Check the port number */
180                 if (wIndex != 1)
181                         break;
182
183                 dev_dbg(dev, "GetPortStatus(%u)\n", wIndex);
184
185                 temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1);
186
187                 /* The port power status (PPS) bit defaults to 1 */
188                 if (hub->get_power && hub->get_power(wIndex) == 0)
189                         temp &= ~RH_PS_PPS;
190
191                 /* The port over-current indicator (POCI) bit is always 0 */
192                 if (hub->get_oci && hub->get_oci(wIndex) > 0)
193                         temp |=  RH_PS_POCI;
194
195                 /* The over-current indicator change (OCIC) bit is 0 too */
196                 if (ocic_mask & (1 << wIndex))
197                         temp |=  RH_PS_OCIC;
198
199                 put_unaligned(cpu_to_le32(temp), (__le32 *)buf);
200                 return 0;
201         case SetPortFeature:
202                 temp = 1;
203                 goto check_port;
204         case ClearPortFeature:
205                 temp = 0;
206
207 check_port:
208                 /* Check the port number */
209                 if (wIndex != 1)
210                         break;
211
212                 switch (wValue) {
213                 case USB_PORT_FEAT_POWER:
214                         dev_dbg(dev, "%sPortFeature(%u): %s\n",
215                                 temp ? "Set" : "Clear", wIndex, "POWER");
216
217                         if (!hub->set_power)
218                                 return -EPIPE;
219
220                         return hub->set_power(wIndex, temp) ? -EPIPE : 0;
221                 case USB_PORT_FEAT_C_OVER_CURRENT:
222                         dev_dbg(dev, "%sPortFeature(%u): %s\n",
223                                 temp ? "Set" : "Clear", wIndex,
224                                 "C_OVER_CURRENT");
225
226                         if (temp)
227                                 ocic_mask |= 1 << wIndex;
228                         else
229                                 ocic_mask &= ~(1 << wIndex);
230                         return 0;
231                 }
232         }
233
234         return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
235 }
236
237 static const struct hc_driver ohci_da8xx_hc_driver = {
238         .description            = hcd_name,
239         .product_desc           = "DA8xx OHCI",
240         .hcd_priv_size          = sizeof(struct ohci_hcd),
241
242         /*
243          * generic hardware linkage
244          */
245         .irq                    = ohci_irq,
246         .flags                  = HCD_USB11 | HCD_MEMORY,
247
248         /*
249          * basic lifecycle operations
250          */
251         .reset                  = ohci_da8xx_init,
252         .start                  = ohci_da8xx_start,
253         .stop                   = ohci_da8xx_stop,
254         .shutdown               = ohci_shutdown,
255
256         /*
257          * managing i/o requests and associated device resources
258          */
259         .urb_enqueue            = ohci_urb_enqueue,
260         .urb_dequeue            = ohci_urb_dequeue,
261         .endpoint_disable       = ohci_endpoint_disable,
262
263         /*
264          * scheduling support
265          */
266         .get_frame_number       = ohci_get_frame,
267
268         /*
269          * root hub support
270          */
271         .hub_status_data        = ohci_da8xx_hub_status_data,
272         .hub_control            = ohci_da8xx_hub_control,
273
274 #ifdef  CONFIG_PM
275         .bus_suspend            = ohci_bus_suspend,
276         .bus_resume             = ohci_bus_resume,
277 #endif
278         .start_port_reset       = ohci_start_port_reset,
279 };
280
281 /*-------------------------------------------------------------------------*/
282
283
284 /**
285  * usb_hcd_da8xx_probe - initialize DA8xx-based HCDs
286  * Context: !in_interrupt()
287  *
288  * Allocates basic resources for this USB host controller, and
289  * then invokes the start() method for the HCD associated with it
290  * through the hotplug entry's driver_data.
291  */
292 static int usb_hcd_da8xx_probe(const struct hc_driver *driver,
293                                struct platform_device *pdev)
294 {
295         struct da8xx_ohci_root_hub *hub = pdev->dev.platform_data;
296         struct usb_hcd  *hcd;
297         struct resource *mem;
298         int error, irq;
299
300         if (hub == NULL)
301                 return -ENODEV;
302
303         usb11_clk = clk_get(&pdev->dev, "usb11");
304         if (IS_ERR(usb11_clk))
305                 return PTR_ERR(usb11_clk);
306
307         usb20_clk = clk_get(&pdev->dev, "usb20");
308         if (IS_ERR(usb20_clk)) {
309                 error = PTR_ERR(usb20_clk);
310                 goto err0;
311         }
312
313         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
314         if (!hcd) {
315                 error = -ENOMEM;
316                 goto err1;
317         }
318
319         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
320         if (!mem) {
321                 error = -ENODEV;
322                 goto err2;
323         }
324         hcd->rsrc_start = mem->start;
325         hcd->rsrc_len = resource_size(mem);
326
327         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
328                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
329                 error = -EBUSY;
330                 goto err2;
331         }
332
333         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
334         if (!hcd->regs) {
335                 dev_err(&pdev->dev, "ioremap failed\n");
336                 error = -ENOMEM;
337                 goto err3;
338         }
339
340         ohci_hcd_init(hcd_to_ohci(hcd));
341
342         irq = platform_get_irq(pdev, 0);
343         if (irq < 0) {
344                 error = -ENODEV;
345                 goto err4;
346         }
347         error = usb_add_hcd(hcd, irq, 0);
348         if (error)
349                 goto err4;
350
351         if (hub->ocic_notify) {
352                 error = hub->ocic_notify(ohci_da8xx_ocic_handler);
353                 if (!error)
354                         return 0;
355         }
356
357         usb_remove_hcd(hcd);
358 err4:
359         iounmap(hcd->regs);
360 err3:
361         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
362 err2:
363         usb_put_hcd(hcd);
364 err1:
365         clk_put(usb20_clk);
366 err0:
367         clk_put(usb11_clk);
368         return error;
369 }
370
371 /**
372  * usb_hcd_da8xx_remove - shutdown processing for DA8xx-based HCDs
373  * @dev: USB Host Controller being removed
374  * Context: !in_interrupt()
375  *
376  * Reverses the effect of usb_hcd_da8xx_probe(), first invoking
377  * the HCD's stop() method.  It is always called from a thread
378  * context, normally "rmmod", "apmd", or something similar.
379  */
380 static inline void
381 usb_hcd_da8xx_remove(struct usb_hcd *hcd, struct platform_device *pdev)
382 {
383         struct da8xx_ohci_root_hub *hub = pdev->dev.platform_data;
384
385         hub->ocic_notify(NULL);
386         usb_remove_hcd(hcd);
387         iounmap(hcd->regs);
388         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
389         usb_put_hcd(hcd);
390         clk_put(usb20_clk);
391         clk_put(usb11_clk);
392 }
393
394 static int ohci_hcd_da8xx_drv_probe(struct platform_device *dev)
395 {
396         return usb_hcd_da8xx_probe(&ohci_da8xx_hc_driver, dev);
397 }
398
399 static int ohci_hcd_da8xx_drv_remove(struct platform_device *dev)
400 {
401         struct usb_hcd  *hcd = platform_get_drvdata(dev);
402
403         usb_hcd_da8xx_remove(hcd, dev);
404         platform_set_drvdata(dev, NULL);
405
406         return 0;
407 }
408
409 #ifdef CONFIG_PM
410 static int ohci_da8xx_suspend(struct platform_device *dev, pm_message_t message)
411 {
412         struct usb_hcd  *hcd    = platform_get_drvdata(dev);
413         struct ohci_hcd *ohci   = hcd_to_ohci(hcd);
414
415         if (time_before(jiffies, ohci->next_statechange))
416                 msleep(5);
417         ohci->next_statechange = jiffies;
418
419         ohci_da8xx_clock(0);
420         hcd->state = HC_STATE_SUSPENDED;
421         dev->dev.power.power_state = PMSG_SUSPEND;
422         return 0;
423 }
424
425 static int ohci_da8xx_resume(struct platform_device *dev)
426 {
427         struct usb_hcd  *hcd    = platform_get_drvdata(dev);
428         struct ohci_hcd *ohci   = hcd_to_ohci(hcd);
429
430         if (time_before(jiffies, ohci->next_statechange))
431                 msleep(5);
432         ohci->next_statechange = jiffies;
433
434         ohci_da8xx_clock(1);
435         dev->dev.power.power_state = PMSG_ON;
436         usb_hcd_resume_root_hub(hcd);
437         return 0;
438 }
439 #endif
440
441 /*
442  * Driver definition to register with platform structure.
443  */
444 static struct platform_driver ohci_hcd_da8xx_driver = {
445         .probe          = ohci_hcd_da8xx_drv_probe,
446         .remove         = ohci_hcd_da8xx_drv_remove,
447         .shutdown       = usb_hcd_platform_shutdown,
448 #ifdef  CONFIG_PM
449         .suspend        = ohci_da8xx_suspend,
450         .resume         = ohci_da8xx_resume,
451 #endif
452         .driver         = {
453                 .owner  = THIS_MODULE,
454                 .name   = "ohci",
455         },
456 };