Merge git://git.infradead.org/mtd-2.6
[linux-2.6] / drivers / usb / host / ehci-au1xxx.c
1 /*
2  * EHCI HCD (Host Controller Driver) for USB.
3  *
4  * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
5  *
6  * Bus Glue for AMD Alchemy Au1xxx
7  *
8  * Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org>
9  *
10  * Modified for AMD Alchemy Au1200 EHC
11  *  by K.Boge <karsten.boge@amd.com>
12  *
13  * This file is licenced under the GPL.
14  */
15
16 #include <linux/platform_device.h>
17 #include <asm/mach-au1x00/au1000.h>
18
19 #define USB_HOST_CONFIG   (USB_MSR_BASE + USB_MSR_MCFG)
20 #define USB_MCFG_PFEN     (1<<31)
21 #define USB_MCFG_RDCOMB   (1<<30)
22 #define USB_MCFG_SSDEN    (1<<23)
23 #define USB_MCFG_PHYPLLEN (1<<19)
24 #define USB_MCFG_EHCCLKEN (1<<17)
25 #define USB_MCFG_UCAM     (1<<7)
26 #define USB_MCFG_EBMEN    (1<<3)
27 #define USB_MCFG_EMEMEN   (1<<2)
28
29 #define USBH_ENABLE_CE    (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN)
30
31 #ifdef CONFIG_DMA_COHERENT
32 #define USBH_ENABLE_INIT  (USBH_ENABLE_CE \
33                          | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
34                          | USB_MCFG_SSDEN | USB_MCFG_UCAM \
35                          | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
36 #else
37 #define USBH_ENABLE_INIT  (USBH_ENABLE_CE \
38                          | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
39                          | USB_MCFG_SSDEN \
40                          | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
41 #endif
42 #define USBH_DISABLE      (USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
43
44 extern int usb_disabled(void);
45
46 /*-------------------------------------------------------------------------*/
47
48 static void au1xxx_start_ehc(struct platform_device *dev)
49 {
50         pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n");
51
52         /* write HW defaults again in case Yamon cleared them */
53         if (au_readl(USB_HOST_CONFIG) == 0) {
54                 au_writel(0x00d02000, USB_HOST_CONFIG);
55                 au_readl(USB_HOST_CONFIG);
56                 udelay(1000);
57         }
58         /* enable host controller */
59         au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
60         au_readl(USB_HOST_CONFIG);
61         udelay(1000);
62         au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG),
63                   USB_HOST_CONFIG);
64         au_readl(USB_HOST_CONFIG);
65         udelay(1000);
66
67         pr_debug(__FILE__ ": Clock to USB host has been enabled\n");
68 }
69
70 static void au1xxx_stop_ehc(struct platform_device *dev)
71 {
72         pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n");
73
74         /* Disable mem */
75         au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
76         udelay(1000);
77         /* Disable clock */
78         au_writel(~USB_MCFG_EHCCLKEN & au_readl(USB_HOST_CONFIG),
79                   USB_HOST_CONFIG);
80         au_readl(USB_HOST_CONFIG);
81 }
82
83 /*-------------------------------------------------------------------------*/
84
85 /* configure so an HC device and id are always provided */
86 /* always called with process context; sleeping is OK */
87
88 /**
89  * usb_ehci_au1xxx_probe - initialize Au1xxx-based HCDs
90  * Context: !in_interrupt()
91  *
92  * Allocates basic resources for this USB host controller, and
93  * then invokes the start() method for the HCD associated with it
94  * through the hotplug entry's driver_data.
95  *
96  */
97 int usb_ehci_au1xxx_probe(const struct hc_driver *driver,
98                           struct usb_hcd **hcd_out, struct platform_device *dev)
99 {
100         int retval;
101         struct usb_hcd *hcd;
102         struct ehci_hcd *ehci;
103
104 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
105
106         /* Au1200 AB USB does not support coherent memory */
107         if (!(read_c0_prid() & 0xff)) {
108                 pr_info("%s: this is chip revision AB!\n", dev->name);
109                 pr_info("%s: update your board or re-configure the kernel\n",
110                         dev->name);
111                 return -ENODEV;
112         }
113 #endif
114
115         au1xxx_start_ehc(dev);
116
117         if (dev->resource[1].flags != IORESOURCE_IRQ) {
118                 pr_debug("resource[1] is not IORESOURCE_IRQ");
119                 retval = -ENOMEM;
120         }
121         hcd = usb_create_hcd(driver, &dev->dev, "Au1xxx");
122         if (!hcd)
123                 return -ENOMEM;
124         hcd->rsrc_start = dev->resource[0].start;
125         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
126
127         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
128                 pr_debug("request_mem_region failed");
129                 retval = -EBUSY;
130                 goto err1;
131         }
132
133         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
134         if (!hcd->regs) {
135                 pr_debug("ioremap failed");
136                 retval = -ENOMEM;
137                 goto err2;
138         }
139
140         ehci = hcd_to_ehci(hcd);
141         ehci->caps = hcd->regs;
142         ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
143         /* cache this readonly data; minimize chip reads */
144         ehci->hcs_params = readl(&ehci->caps->hcs_params);
145
146         /* ehci_hcd_init(hcd_to_ehci(hcd)); */
147
148         retval =
149             usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED | IRQF_SHARED);
150         if (retval == 0)
151                 return retval;
152
153         au1xxx_stop_ehc(dev);
154         iounmap(hcd->regs);
155 err2:
156         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
157 err1:
158         usb_put_hcd(hcd);
159         return retval;
160 }
161
162 /* may be called without controller electrically present */
163 /* may be called with controller, bus, and devices active */
164
165 /**
166  * usb_ehci_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
167  * @dev: USB Host Controller being removed
168  * Context: !in_interrupt()
169  *
170  * Reverses the effect of usb_ehci_hcd_au1xxx_probe(), first invoking
171  * the HCD's stop() method.  It is always called from a thread
172  * context, normally "rmmod", "apmd", or something similar.
173  *
174  */
175 void usb_ehci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
176 {
177         usb_remove_hcd(hcd);
178         iounmap(hcd->regs);
179         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
180         usb_put_hcd(hcd);
181         au1xxx_stop_ehc(dev);
182 }
183
184 /*-------------------------------------------------------------------------*/
185
186 static const struct hc_driver ehci_au1xxx_hc_driver = {
187         .description = hcd_name,
188         .product_desc = "Au1xxx EHCI",
189         .hcd_priv_size = sizeof(struct ehci_hcd),
190
191         /*
192          * generic hardware linkage
193          */
194         .irq = ehci_irq,
195         .flags = HCD_MEMORY | HCD_USB2,
196
197         /*
198          * basic lifecycle operations
199          */
200         .reset = ehci_init,
201         .start = ehci_run,
202         .stop = ehci_stop,
203         .shutdown = ehci_shutdown,
204
205         /*
206          * managing i/o requests and associated device resources
207          */
208         .urb_enqueue = ehci_urb_enqueue,
209         .urb_dequeue = ehci_urb_dequeue,
210         .endpoint_disable = ehci_endpoint_disable,
211
212         /*
213          * scheduling support
214          */
215         .get_frame_number = ehci_get_frame,
216
217         /*
218          * root hub support
219          */
220         .hub_status_data = ehci_hub_status_data,
221         .hub_control = ehci_hub_control,
222 #ifdef  CONFIG_PM
223         .hub_suspend = ehci_hub_suspend,
224         .hub_resume = ehci_hub_resume,
225 #endif
226 };
227
228 /*-------------------------------------------------------------------------*/
229
230 static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
231 {
232         struct usb_hcd *hcd = NULL;
233         int ret;
234
235         pr_debug("In ehci_hcd_au1xxx_drv_probe\n");
236
237         if (usb_disabled())
238                 return -ENODEV;
239
240         ret = usb_ehci_au1xxx_probe(&ehci_au1xxx_hc_driver, &hcd, pdev);
241         return ret;
242 }
243
244 static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
245 {
246         struct usb_hcd *hcd = platform_get_drvdata(pdev);
247
248         usb_ehci_au1xxx_remove(hcd, pdev);
249         return 0;
250 }
251
252  /*TBD*/
253 /*static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
254 {
255         struct platform_device *pdev = to_platform_device(dev);
256         struct usb_hcd *hcd = dev_get_drvdata(dev);
257
258         return 0;
259 }
260 static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
261 {
262         struct platform_device *pdev = to_platform_device(dev);
263         struct usb_hcd *hcd = dev_get_drvdata(dev);
264
265         return 0;
266 }
267 */
268 MODULE_ALIAS("au1xxx-ehci");
269 static struct platform_driver ehci_hcd_au1xxx_driver = {
270         .probe = ehci_hcd_au1xxx_drv_probe,
271         .remove = ehci_hcd_au1xxx_drv_remove,
272         .shutdown = usb_hcd_platform_shutdown,
273         /*.suspend      = ehci_hcd_au1xxx_drv_suspend, */
274         /*.resume       = ehci_hcd_au1xxx_drv_resume, */
275         .driver = {
276                 .name = "au1xxx-ehci",
277                 .bus = &platform_bus_type
278         }
279 };