958d985f29513f36b2840b77a532c09a7bafa45e
[linux-2.6.git] / 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 defined(__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 #ifdef  CONFIG_PM
167         .bus_suspend =          ohci_bus_suspend,
168         .bus_resume =           ohci_bus_resume,
169 #endif
170         .start_port_reset =     ohci_start_port_reset,
171 };
172
173 static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
174 {
175         int ret;
176         struct usb_hcd *hcd;
177
178         if (usb_disabled())
179                 return -ENODEV;
180
181 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
182         /* Au1200 AB USB does not support coherent memory */
183         if (!(read_c0_prid() & 0xff)) {
184                 printk(KERN_INFO "%s: this is chip revision AB !!\n",
185                         pdev->name);
186                 printk(KERN_INFO "%s: update your board or re-configure "
187                                  "the kernel\n", pdev->name);
188                 return -ENODEV;
189         }
190 #endif
191
192         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
193                 pr_debug("resource[1] is not IORESOURCE_IRQ\n");
194                 return -ENOMEM;
195         }
196
197         hcd = usb_create_hcd(&ohci_au1xxx_hc_driver, &pdev->dev, "au1xxx");
198         if (!hcd)
199                 return -ENOMEM;
200
201         hcd->rsrc_start = pdev->resource[0].start;
202         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
203
204         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
205                 pr_debug("request_mem_region failed\n");
206                 ret = -EBUSY;
207                 goto err1;
208         }
209
210         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
211         if (!hcd->regs) {
212                 pr_debug("ioremap failed\n");
213                 ret = -ENOMEM;
214                 goto err2;
215         }
216
217         au1xxx_start_ohc();
218         ohci_hcd_init(hcd_to_ohci(hcd));
219
220         ret = usb_add_hcd(hcd, pdev->resource[1].start,
221                           IRQF_DISABLED | IRQF_SHARED);
222         if (ret == 0) {
223                 platform_set_drvdata(pdev, hcd);
224                 return ret;
225         }
226
227         au1xxx_stop_ohc();
228         iounmap(hcd->regs);
229 err2:
230         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
231 err1:
232         usb_put_hcd(hcd);
233         return ret;
234 }
235
236 static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
237 {
238         struct usb_hcd *hcd = platform_get_drvdata(pdev);
239
240         usb_remove_hcd(hcd);
241         au1xxx_stop_ohc();
242         iounmap(hcd->regs);
243         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
244         usb_put_hcd(hcd);
245         platform_set_drvdata(pdev, NULL);
246
247         return 0;
248 }
249
250 #ifdef CONFIG_PM
251 static int ohci_hcd_au1xxx_drv_suspend(struct device *dev)
252 {
253         struct usb_hcd *hcd = dev_get_drvdata(dev);
254         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
255         unsigned long flags;
256         int rc;
257
258         rc = 0;
259
260         /* Root hub was already suspended. Disable irq emission and
261          * mark HW unaccessible, bail out if RH has been resumed. Use
262          * the spinlock to properly synchronize with possible pending
263          * RH suspend or resume activity.
264          *
265          * This is still racy as hcd->state is manipulated outside of
266          * any locks =P But that will be a different fix.
267          */
268         spin_lock_irqsave(&ohci->lock, flags);
269         if (hcd->state != HC_STATE_SUSPENDED) {
270                 rc = -EINVAL;
271                 goto bail;
272         }
273         ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
274         (void)ohci_readl(ohci, &ohci->regs->intrdisable);
275
276         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
277
278         au1xxx_stop_ohc();
279 bail:
280         spin_unlock_irqrestore(&ohci->lock, flags);
281
282         return rc;
283 }
284
285 static int ohci_hcd_au1xxx_drv_resume(struct device *dev)
286 {
287         struct usb_hcd *hcd = dev_get_drvdata(dev);
288
289         au1xxx_start_ohc();
290
291         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
292         ohci_finish_controller_resume(hcd);
293
294         return 0;
295 }
296
297 static const struct dev_pm_ops au1xxx_ohci_pmops = {
298         .suspend        = ohci_hcd_au1xxx_drv_suspend,
299         .resume         = ohci_hcd_au1xxx_drv_resume,
300 };
301
302 #define AU1XXX_OHCI_PMOPS &au1xxx_ohci_pmops
303
304 #else
305 #define AU1XXX_OHCI_PMOPS NULL
306 #endif
307
308 static struct platform_driver ohci_hcd_au1xxx_driver = {
309         .probe          = ohci_hcd_au1xxx_drv_probe,
310         .remove         = ohci_hcd_au1xxx_drv_remove,
311         .shutdown       = usb_hcd_platform_shutdown,
312         .driver         = {
313                 .name   = "au1xxx-ohci",
314                 .owner  = THIS_MODULE,
315                 .pm     = AU1XXX_OHCI_PMOPS,
316         },
317 };
318
319 MODULE_ALIAS("platform:au1xxx-ohci");