Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / drivers / usb / host / ohci-au1xxx.c
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 AMD Alchemy Au1xxx
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  * Modified for AMD Alchemy Au1xxx
16  *  by Matt Porter <mporter@kernel.crashing.org>
17  *
18  * This file is licenced under the GPL.
19  */
20
21 #include <linux/platform_device.h>
22 #include <linux/signal.h>
23
24 #include <asm/mach-au1x00/au1000.h>
25
26 #ifndef CONFIG_SOC_AU1200
27
28 #define USBH_ENABLE_BE (1<<0)
29 #define USBH_ENABLE_C  (1<<1)
30 #define USBH_ENABLE_E  (1<<2)
31 #define USBH_ENABLE_CE (1<<3)
32 #define USBH_ENABLE_RD (1<<4)
33
34 #ifdef __LITTLE_ENDIAN
35 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
36 #elif __BIG_ENDIAN
37 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | \
38                           USBH_ENABLE_BE)
39 #else
40 #error not byte order defined
41 #endif
42
43 #else   /* Au1200 */
44
45 #define USB_HOST_CONFIG    (USB_MSR_BASE + USB_MSR_MCFG)
46 #define USB_MCFG_PFEN     (1<<31)
47 #define USB_MCFG_RDCOMB   (1<<30)
48 #define USB_MCFG_SSDEN    (1<<23)
49 #define USB_MCFG_OHCCLKEN (1<<16)
50 #ifdef CONFIG_DMA_COHERENT
51 #define USB_MCFG_UCAM     (1<<7)
52 #else
53 #define USB_MCFG_UCAM     (0)
54 #endif
55 #define USB_MCFG_OBMEN    (1<<1)
56 #define USB_MCFG_OMEMEN   (1<<0)
57
58 #define USBH_ENABLE_CE    USB_MCFG_OHCCLKEN
59
60 #define USBH_ENABLE_INIT  (USB_MCFG_PFEN  | USB_MCFG_RDCOMB     |       \
61                            USBH_ENABLE_CE | USB_MCFG_SSDEN      |       \
62                            USB_MCFG_UCAM  |                             \
63                            USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
64
65 #define USBH_DISABLE      (USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
66
67 #endif  /* Au1200 */
68
69 extern int usb_disabled(void);
70
71 static void au1xxx_start_ohc(void)
72 {
73         /* enable host controller */
74 #ifndef CONFIG_SOC_AU1200
75         au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
76         au_sync();
77         udelay(1000);
78
79         au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
80         au_sync();
81         udelay(1000);
82
83         /* wait for reset complete (read register twice; see au1500 errata) */
84         while (au_readl(USB_HOST_CONFIG),
85                 !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
86                 udelay(1000);
87
88 #else   /* Au1200 */
89         au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_CE, USB_HOST_CONFIG);
90         au_sync();
91         udelay(1000);
92
93         au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
94         au_sync();
95         udelay(2000);
96 #endif  /* Au1200 */
97 }
98
99 static void au1xxx_stop_ohc(void)
100 {
101 #ifdef CONFIG_SOC_AU1200
102         /* Disable mem */
103         au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_DISABLE, USB_HOST_CONFIG);
104         au_sync();
105         udelay(1000);
106 #endif
107         /* Disable clock */
108         au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
109         au_sync();
110 }
111
112 static int __devinit ohci_au1xxx_start(struct usb_hcd *hcd)
113 {
114         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
115         int ret;
116
117         ohci_dbg(ohci, "ohci_au1xxx_start, ohci:%p", ohci);
118
119         if ((ret = ohci_init(ohci)) < 0)
120                 return ret;
121
122         if ((ret = ohci_run(ohci)) < 0) {
123                 err ("can't start %s", hcd->self.bus_name);
124                 ohci_stop(hcd);
125                 return ret;
126         }
127
128         return 0;
129 }
130
131 static const struct hc_driver ohci_au1xxx_hc_driver = {
132         .description =          hcd_name,
133         .product_desc =         "Au1xxx OHCI",
134         .hcd_priv_size =        sizeof(struct ohci_hcd),
135
136         /*
137          * generic hardware linkage
138          */
139         .irq =                  ohci_irq,
140         .flags =                HCD_USB11 | HCD_MEMORY,
141
142         /*
143          * basic lifecycle operations
144          */
145         .start =                ohci_au1xxx_start,
146         .stop =                 ohci_stop,
147         .shutdown =             ohci_shutdown,
148
149         /*
150          * managing i/o requests and associated device resources
151          */
152         .urb_enqueue =          ohci_urb_enqueue,
153         .urb_dequeue =          ohci_urb_dequeue,
154         .endpoint_disable =     ohci_endpoint_disable,
155
156         /*
157          * scheduling support
158          */
159         .get_frame_number =     ohci_get_frame,
160
161         /*
162          * root hub support
163          */
164         .hub_status_data =      ohci_hub_status_data,
165         .hub_control =          ohci_hub_control,
166         .hub_irq_enable =       ohci_rhsc_enable,
167 #ifdef  CONFIG_PM
168         .bus_suspend =          ohci_bus_suspend,
169         .bus_resume =           ohci_bus_resume,
170 #endif
171         .start_port_reset =     ohci_start_port_reset,
172 };
173
174 static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
175 {
176         int ret;
177         struct usb_hcd *hcd;
178
179         if (usb_disabled())
180                 return -ENODEV;
181
182 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
183         /* Au1200 AB USB does not support coherent memory */
184         if (!(read_c0_prid() & 0xff)) {
185                 printk(KERN_INFO "%s: this is chip revision AB !!\n",
186                         pdev->name);
187                 printk(KERN_INFO "%s: update your board or re-configure "
188                                  "the kernel\n", pdev->name);
189                 return -ENODEV;
190         }
191 #endif
192
193         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
194                 pr_debug("resource[1] is not IORESOURCE_IRQ\n");
195                 return -ENOMEM;
196         }
197
198         hcd = usb_create_hcd(&ohci_au1xxx_hc_driver, &pdev->dev, "au1xxx");
199         if (!hcd)
200                 return -ENOMEM;
201
202         hcd->rsrc_start = pdev->resource[0].start;
203         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
204
205         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
206                 pr_debug("request_mem_region failed\n");
207                 ret = -EBUSY;
208                 goto err1;
209         }
210
211         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
212         if (!hcd->regs) {
213                 pr_debug("ioremap failed\n");
214                 ret = -ENOMEM;
215                 goto err2;
216         }
217
218         au1xxx_start_ohc();
219         ohci_hcd_init(hcd_to_ohci(hcd));
220
221         ret = usb_add_hcd(hcd, pdev->resource[1].start,
222                           IRQF_DISABLED | IRQF_SHARED);
223         if (ret == 0) {
224                 platform_set_drvdata(pdev, hcd);
225                 return ret;
226         }
227
228         au1xxx_stop_ohc();
229         iounmap(hcd->regs);
230 err2:
231         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
232 err1:
233         usb_put_hcd(hcd);
234         return ret;
235 }
236
237 static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
238 {
239         struct usb_hcd *hcd = platform_get_drvdata(pdev);
240
241         usb_remove_hcd(hcd);
242         au1xxx_stop_ohc();
243         iounmap(hcd->regs);
244         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
245         usb_put_hcd(hcd);
246         platform_set_drvdata(pdev, NULL);
247
248         return 0;
249 }
250
251 #ifdef CONFIG_PM
252 static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *pdev,
253                                         pm_message_t message)
254 {
255         struct usb_hcd *hcd = platform_get_drvdata(pdev);
256         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
257         unsigned long flags;
258         int rc;
259
260         rc = 0;
261
262         /* Root hub was already suspended. Disable irq emission and
263          * mark HW unaccessible, bail out if RH has been resumed. Use
264          * the spinlock to properly synchronize with possible pending
265          * RH suspend or resume activity.
266          *
267          * This is still racy as hcd->state is manipulated outside of
268          * any locks =P But that will be a different fix.
269          */
270         spin_lock_irqsave(&ohci->lock, flags);
271         if (hcd->state != HC_STATE_SUSPENDED) {
272                 rc = -EINVAL;
273                 goto bail;
274         }
275         ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
276         (void)ohci_readl(ohci, &ohci->regs->intrdisable);
277
278         /* make sure snapshot being resumed re-enumerates everything */
279         if (message.event == PM_EVENT_PRETHAW)
280                 ohci_usb_reset(ohci);
281
282         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
283
284         au1xxx_stop_ohc();
285 bail:
286         spin_unlock_irqrestore(&ohci->lock, flags);
287
288         return rc;
289 }
290
291 static int ohci_hcd_au1xxx_drv_resume(struct platform_device *pdev)
292 {
293         struct usb_hcd *hcd = platform_get_drvdata(pdev);
294
295         au1xxx_start_ohc();
296
297         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
298         ohci_finish_controller_resume(hcd);
299
300         return 0;
301 }
302 #else
303 #define ohci_hcd_au1xxx_drv_suspend NULL
304 #define ohci_hcd_au1xxx_drv_resume NULL
305 #endif
306
307 static struct platform_driver ohci_hcd_au1xxx_driver = {
308         .probe          = ohci_hcd_au1xxx_drv_probe,
309         .remove         = ohci_hcd_au1xxx_drv_remove,
310         .shutdown       = usb_hcd_platform_shutdown,
311         .suspend        = ohci_hcd_au1xxx_drv_suspend,
312         .resume         = ohci_hcd_au1xxx_drv_resume,
313         .driver         = {
314                 .name   = "au1xxx-ohci",
315                 .owner  = THIS_MODULE,
316         },
317 };
318
319 MODULE_ALIAS("platform:au1xxx-ohci");