Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-mmc
[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 #endif                          /* Au1200 */
45
46 extern int usb_disabled(void);
47
48 /*-------------------------------------------------------------------------*/
49
50 static void au1xxx_start_ehc(struct platform_device *dev)
51 {
52         pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n");
53
54         /* write HW defaults again in case Yamon cleared them */
55         if (au_readl(USB_HOST_CONFIG) == 0) {
56                 au_writel(0x00d02000, USB_HOST_CONFIG);
57                 au_readl(USB_HOST_CONFIG);
58                 udelay(1000);
59         }
60         /* enable host controller */
61         au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
62         au_readl(USB_HOST_CONFIG);
63         udelay(1000);
64         au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG),
65                   USB_HOST_CONFIG);
66         au_readl(USB_HOST_CONFIG);
67         udelay(1000);
68
69         pr_debug(__FILE__ ": Clock to USB host has been enabled\n");
70 }
71
72 static void au1xxx_stop_ehc(struct platform_device *dev)
73 {
74         pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n");
75
76         /* Disable mem */
77         au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
78         udelay(1000);
79         /* Disable clock */
80         au_writel(~USB_MCFG_EHCCLKEN & au_readl(USB_HOST_CONFIG),
81                   USB_HOST_CONFIG);
82         au_readl(USB_HOST_CONFIG);
83 }
84
85 /*-------------------------------------------------------------------------*/
86
87 /* configure so an HC device and id are always provided */
88 /* always called with process context; sleeping is OK */
89
90 /**
91  * usb_ehci_au1xxx_probe - initialize Au1xxx-based HCDs
92  * Context: !in_interrupt()
93  *
94  * Allocates basic resources for this USB host controller, and
95  * then invokes the start() method for the HCD associated with it
96  * through the hotplug entry's driver_data.
97  *
98  */
99 int usb_ehci_au1xxx_probe(const struct hc_driver *driver,
100                           struct usb_hcd **hcd_out, struct platform_device *dev)
101 {
102         int retval;
103         struct usb_hcd *hcd;
104         struct ehci_hcd *ehci;
105
106 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
107
108         /* Au1200 AB USB does not support coherent memory */
109         if (!(read_c0_prid() & 0xff)) {
110                 pr_info("%s: this is chip revision AB!\n", dev->dev.name);
111                 pr_info("%s: update your board or re-configure the kernel\n",
112                         dev->dev.name);
113                 return -ENODEV;
114         }
115 #endif
116
117         au1xxx_start_ehc(dev);
118
119         if (dev->resource[1].flags != IORESOURCE_IRQ) {
120                 pr_debug("resource[1] is not IORESOURCE_IRQ");
121                 retval = -ENOMEM;
122         }
123         hcd = usb_create_hcd(driver, &dev->dev, "Au1xxx");
124         if (!hcd)
125                 return -ENOMEM;
126         hcd->rsrc_start = dev->resource[0].start;
127         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
128
129         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
130                 pr_debug("request_mem_region failed");
131                 retval = -EBUSY;
132                 goto err1;
133         }
134
135         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
136         if (!hcd->regs) {
137                 pr_debug("ioremap failed");
138                 retval = -ENOMEM;
139                 goto err2;
140         }
141
142         ehci = hcd_to_ehci(hcd);
143         ehci->caps = hcd->regs;
144         ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
145         /* cache this readonly data; minimize chip reads */
146         ehci->hcs_params = readl(&ehci->caps->hcs_params);
147
148         /* ehci_hcd_init(hcd_to_ehci(hcd)); */
149
150         retval =
151             usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT | SA_SHIRQ);
152         if (retval == 0)
153                 return retval;
154
155         au1xxx_stop_ehc(dev);
156         iounmap(hcd->regs);
157 err2:
158         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
159 err1:
160         usb_put_hcd(hcd);
161         return retval;
162 }
163
164 /* may be called without controller electrically present */
165 /* may be called with controller, bus, and devices active */
166
167 /**
168  * usb_ehci_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
169  * @dev: USB Host Controller being removed
170  * Context: !in_interrupt()
171  *
172  * Reverses the effect of usb_ehci_hcd_au1xxx_probe(), first invoking
173  * the HCD's stop() method.  It is always called from a thread
174  * context, normally "rmmod", "apmd", or something similar.
175  *
176  */
177 void usb_ehci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
178 {
179         usb_remove_hcd(hcd);
180         iounmap(hcd->regs);
181         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
182         usb_put_hcd(hcd);
183         au1xxx_stop_ehc(dev);
184 }
185
186 /*-------------------------------------------------------------------------*/
187
188 static const struct hc_driver ehci_au1xxx_hc_driver = {
189         .description = hcd_name,
190         .product_desc = "Au1xxx EHCI",
191         .hcd_priv_size = sizeof(struct ehci_hcd),
192
193         /*
194          * generic hardware linkage
195          */
196         .irq = ehci_irq,
197         .flags = HCD_MEMORY | HCD_USB2,
198
199         /*
200          * basic lifecycle operations
201          */
202         .reset = ehci_init,
203         .start = ehci_run,
204         .stop = ehci_stop,
205
206         /*
207          * managing i/o requests and associated device resources
208          */
209         .urb_enqueue = ehci_urb_enqueue,
210         .urb_dequeue = ehci_urb_dequeue,
211         .endpoint_disable = ehci_endpoint_disable,
212
213         /*
214          * scheduling support
215          */
216         .get_frame_number = ehci_get_frame,
217
218         /*
219          * root hub support
220          */
221         .hub_status_data = ehci_hub_status_data,
222         .hub_control = ehci_hub_control,
223 #ifdef  CONFIG_PM
224         .hub_suspend = ehci_hub_suspend,
225         .hub_resume = ehci_hub_resume,
226 #endif
227 };
228
229 /*-------------------------------------------------------------------------*/
230
231 static int ehci_hcd_au1xxx_drv_probe(struct device *dev)
232 {
233         struct platform_device *pdev = to_platform_device(dev);
234         struct usb_hcd *hcd = NULL;
235         int ret;
236
237         pr_debug("In ehci_hcd_au1xxx_drv_probe\n");
238
239         if (usb_disabled())
240                 return -ENODEV;
241
242         ret = usb_ehci_au1xxx_probe(&ehci_au1xxx_hc_driver, &hcd, pdev);
243         return ret;
244 }
245
246 static int ehci_hcd_au1xxx_drv_remove(struct device *dev)
247 {
248         struct platform_device *pdev = to_platform_device(dev);
249         struct usb_hcd *hcd = dev_get_drvdata(dev);
250
251         usb_ehci_au1xxx_remove(hcd, pdev);
252         return 0;
253 }
254
255  /*TBD*/
256 /*static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
257 {
258         struct platform_device *pdev = to_platform_device(dev);
259         struct usb_hcd *hcd = dev_get_drvdata(dev);
260
261         return 0;
262 }
263 static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
264 {
265         struct platform_device *pdev = to_platform_device(dev);
266         struct usb_hcd *hcd = dev_get_drvdata(dev);
267
268         return 0;
269 }
270 */
271 MODULE_ALIAS("au1xxx-ehci");
272 /* FIXME use "struct platform_driver" */
273 static struct device_driver ehci_hcd_au1xxx_driver = {
274         .name = "au1xxx-ehci",
275         .bus = &platform_bus_type,
276         .probe = ehci_hcd_au1xxx_drv_probe,
277         .remove = ehci_hcd_au1xxx_drv_remove,
278         /*.suspend      = ehci_hcd_au1xxx_drv_suspend, */
279         /*.resume       = ehci_hcd_au1xxx_drv_resume, */
280 };