Merge branch 'linus' into tracing/sysprof
[linux-2.6] / drivers / usb / host / ehci-au1xxx.c
1 /*
2  * EHCI HCD (Host Controller Driver) for USB.
3  *
4  * Bus Glue for AMD Alchemy Au1xxx
5  *
6  * Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org>
7  *
8  * Modified for AMD Alchemy Au1200 EHC
9  *  by K.Boge <karsten.boge@amd.com>
10  *
11  * This file is licenced under the GPL.
12  */
13
14 #include <linux/platform_device.h>
15 #include <asm/mach-au1x00/au1000.h>
16
17 #define USB_HOST_CONFIG   (USB_MSR_BASE + USB_MSR_MCFG)
18 #define USB_MCFG_PFEN     (1<<31)
19 #define USB_MCFG_RDCOMB   (1<<30)
20 #define USB_MCFG_SSDEN    (1<<23)
21 #define USB_MCFG_PHYPLLEN (1<<19)
22 #define USB_MCFG_EHCCLKEN (1<<17)
23 #define USB_MCFG_UCAM     (1<<7)
24 #define USB_MCFG_EBMEN    (1<<3)
25 #define USB_MCFG_EMEMEN   (1<<2)
26
27 #define USBH_ENABLE_CE    (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN)
28
29 #ifdef CONFIG_DMA_COHERENT
30 #define USBH_ENABLE_INIT  (USBH_ENABLE_CE \
31                          | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
32                          | USB_MCFG_SSDEN | USB_MCFG_UCAM \
33                          | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
34 #else
35 #define USBH_ENABLE_INIT  (USBH_ENABLE_CE \
36                          | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
37                          | USB_MCFG_SSDEN \
38                          | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
39 #endif
40 #define USBH_DISABLE      (USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
41
42 extern int usb_disabled(void);
43
44 /*-------------------------------------------------------------------------*/
45
46 static void au1xxx_start_ehc(struct platform_device *dev)
47 {
48         pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n");
49
50         /* write HW defaults again in case Yamon cleared them */
51         if (au_readl(USB_HOST_CONFIG) == 0) {
52                 au_writel(0x00d02000, USB_HOST_CONFIG);
53                 au_readl(USB_HOST_CONFIG);
54                 udelay(1000);
55         }
56         /* enable host controller */
57         au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
58         au_readl(USB_HOST_CONFIG);
59         udelay(1000);
60         au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG),
61                   USB_HOST_CONFIG);
62         au_readl(USB_HOST_CONFIG);
63         udelay(1000);
64
65         pr_debug(__FILE__ ": Clock to USB host has been enabled\n");
66 }
67
68 static void au1xxx_stop_ehc(struct platform_device *dev)
69 {
70         pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n");
71
72         /* Disable mem */
73         au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
74         udelay(1000);
75         /* Disable clock */
76         au_writel(~USB_MCFG_EHCCLKEN & au_readl(USB_HOST_CONFIG),
77                   USB_HOST_CONFIG);
78         au_readl(USB_HOST_CONFIG);
79 }
80
81 /*-------------------------------------------------------------------------*/
82
83 /* configure so an HC device and id are always provided */
84 /* always called with process context; sleeping is OK */
85
86 /**
87  * usb_ehci_au1xxx_probe - initialize Au1xxx-based HCDs
88  * Context: !in_interrupt()
89  *
90  * Allocates basic resources for this USB host controller, and
91  * then invokes the start() method for the HCD associated with it
92  * through the hotplug entry's driver_data.
93  *
94  */
95 int usb_ehci_au1xxx_probe(const struct hc_driver *driver,
96                           struct usb_hcd **hcd_out, struct platform_device *dev)
97 {
98         int retval;
99         struct usb_hcd *hcd;
100         struct ehci_hcd *ehci;
101
102 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
103
104         /* Au1200 AB USB does not support coherent memory */
105         if (!(read_c0_prid() & 0xff)) {
106                 pr_info("%s: this is chip revision AB!\n", dev->name);
107                 pr_info("%s: update your board or re-configure the kernel\n",
108                         dev->name);
109                 return -ENODEV;
110         }
111 #endif
112
113         au1xxx_start_ehc(dev);
114
115         if (dev->resource[1].flags != IORESOURCE_IRQ) {
116                 pr_debug("resource[1] is not IORESOURCE_IRQ");
117                 retval = -ENOMEM;
118         }
119         hcd = usb_create_hcd(driver, &dev->dev, "Au1xxx");
120         if (!hcd)
121                 return -ENOMEM;
122         hcd->rsrc_start = dev->resource[0].start;
123         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
124
125         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
126                 pr_debug("request_mem_region failed");
127                 retval = -EBUSY;
128                 goto err1;
129         }
130
131         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
132         if (!hcd->regs) {
133                 pr_debug("ioremap failed");
134                 retval = -ENOMEM;
135                 goto err2;
136         }
137
138         ehci = hcd_to_ehci(hcd);
139         ehci->caps = hcd->regs;
140         ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
141         /* cache this readonly data; minimize chip reads */
142         ehci->hcs_params = readl(&ehci->caps->hcs_params);
143
144         /* ehci_hcd_init(hcd_to_ehci(hcd)); */
145
146         retval =
147             usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED | IRQF_SHARED);
148         if (retval == 0)
149                 return retval;
150
151         au1xxx_stop_ehc(dev);
152         iounmap(hcd->regs);
153 err2:
154         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
155 err1:
156         usb_put_hcd(hcd);
157         return retval;
158 }
159
160 /* may be called without controller electrically present */
161 /* may be called with controller, bus, and devices active */
162
163 /**
164  * usb_ehci_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
165  * @dev: USB Host Controller being removed
166  * Context: !in_interrupt()
167  *
168  * Reverses the effect of usb_ehci_hcd_au1xxx_probe(), first invoking
169  * the HCD's stop() method.  It is always called from a thread
170  * context, normally "rmmod", "apmd", or something similar.
171  *
172  */
173 void usb_ehci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
174 {
175         usb_remove_hcd(hcd);
176         iounmap(hcd->regs);
177         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
178         usb_put_hcd(hcd);
179         au1xxx_stop_ehc(dev);
180 }
181
182 /*-------------------------------------------------------------------------*/
183
184 static const struct hc_driver ehci_au1xxx_hc_driver = {
185         .description = hcd_name,
186         .product_desc = "Au1xxx EHCI",
187         .hcd_priv_size = sizeof(struct ehci_hcd),
188
189         /*
190          * generic hardware linkage
191          */
192         .irq = ehci_irq,
193         .flags = HCD_MEMORY | HCD_USB2,
194
195         /*
196          * basic lifecycle operations
197          *
198          * FIXME -- ehci_init() doesn't do enough here.
199          * See ehci-ppc-soc for a complete implementation.
200          */
201         .reset = ehci_init,
202         .start = ehci_run,
203         .stop = ehci_stop,
204         .shutdown = ehci_shutdown,
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         .bus_suspend = ehci_bus_suspend,
224         .bus_resume = ehci_bus_resume,
225         .relinquish_port = ehci_relinquish_port,
226         .port_handed_over = ehci_port_handed_over,
227 };
228
229 /*-------------------------------------------------------------------------*/
230
231 static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
232 {
233         struct usb_hcd *hcd = NULL;
234         int ret;
235
236         pr_debug("In ehci_hcd_au1xxx_drv_probe\n");
237
238         if (usb_disabled())
239                 return -ENODEV;
240
241         /* FIXME we only want one one probe() not two */
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 platform_device *pdev)
247 {
248         struct usb_hcd *hcd = platform_get_drvdata(pdev);
249
250         /* FIXME we only want one one remove() not two */
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("platform:au1xxx-ehci");
272 static struct platform_driver ehci_hcd_au1xxx_driver = {
273         .probe = ehci_hcd_au1xxx_drv_probe,
274         .remove = ehci_hcd_au1xxx_drv_remove,
275         .shutdown = usb_hcd_platform_shutdown,
276         /*.suspend      = ehci_hcd_au1xxx_drv_suspend, */
277         /*.resume       = ehci_hcd_au1xxx_drv_resume, */
278         .driver = {
279                 .name = "au1xxx-ehci",
280         }
281 };