[SPARC64]: check fork_idle() error
[pohmelfs.git] / drivers / usb / host / ehci-au1xxx.c
blobb1d19268cb23df9688be260794ef475bddbe0340
1 /*
2 * EHCI HCD (Host Controller Driver) for USB.
4 * Bus Glue for AMD Alchemy Au1xxx
6 * Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org>
8 * Modified for AMD Alchemy Au1200 EHC
9 * by K.Boge <karsten.boge@amd.com>
11 * This file is licenced under the GPL.
14 #include <linux/platform_device.h>
15 #include <asm/mach-au1x00/au1000.h>
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)
27 #define USBH_ENABLE_CE (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN)
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)
42 extern int usb_disabled(void);
44 /*-------------------------------------------------------------------------*/
46 static void au1xxx_start_ehc(struct platform_device *dev)
48 pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n");
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);
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);
65 pr_debug(__FILE__ ": Clock to USB host has been enabled\n");
68 static void au1xxx_stop_ehc(struct platform_device *dev)
70 pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n");
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);
81 /*-------------------------------------------------------------------------*/
83 /* configure so an HC device and id are always provided */
84 /* always called with process context; sleeping is OK */
86 /**
87 * usb_ehci_au1xxx_probe - initialize Au1xxx-based HCDs
88 * Context: !in_interrupt()
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.
95 int usb_ehci_au1xxx_probe(const struct hc_driver *driver,
96 struct usb_hcd **hcd_out, struct platform_device *dev)
98 int retval;
99 struct usb_hcd *hcd;
100 struct ehci_hcd *ehci;
102 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
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;
111 #endif
113 au1xxx_start_ehc(dev);
115 if (dev->resource[1].flags != IORESOURCE_IRQ) {
116 pr_debug("resource[1] is not IORESOURCE_IRQ");
117 retval = -ENOMEM;
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;
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;
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;
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);
144 /* ehci_hcd_init(hcd_to_ehci(hcd)); */
146 retval =
147 usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED | IRQF_SHARED);
148 if (retval == 0)
149 return retval;
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;
160 /* may be called without controller electrically present */
161 /* may be called with controller, bus, and devices active */
164 * usb_ehci_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
165 * @dev: USB Host Controller being removed
166 * Context: !in_interrupt()
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.
173 void usb_ehci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
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);
182 /*-------------------------------------------------------------------------*/
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),
190 * generic hardware linkage
192 .irq = ehci_irq,
193 .flags = HCD_MEMORY | HCD_USB2,
196 * basic lifecycle operations
198 * FIXME -- ehci_init() doesn't do enough here.
199 * See ehci-ppc-soc for a complete implementation.
201 .reset = ehci_init,
202 .start = ehci_run,
203 .stop = ehci_stop,
204 .shutdown = ehci_shutdown,
207 * managing i/o requests and associated device resources
209 .urb_enqueue = ehci_urb_enqueue,
210 .urb_dequeue = ehci_urb_dequeue,
211 .endpoint_disable = ehci_endpoint_disable,
214 * scheduling support
216 .get_frame_number = ehci_get_frame,
219 * root hub support
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
229 /*-------------------------------------------------------------------------*/
231 static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
233 struct usb_hcd *hcd = NULL;
234 int ret;
236 pr_debug("In ehci_hcd_au1xxx_drv_probe\n");
238 if (usb_disabled())
239 return -ENODEV;
241 ret = usb_ehci_au1xxx_probe(&ehci_au1xxx_hc_driver, &hcd, pdev);
242 return ret;
245 static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
247 struct usb_hcd *hcd = platform_get_drvdata(pdev);
249 usb_ehci_au1xxx_remove(hcd, pdev);
250 return 0;
253 /*TBD*/
254 /*static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
256 struct platform_device *pdev = to_platform_device(dev);
257 struct usb_hcd *hcd = dev_get_drvdata(dev);
259 return 0;
261 static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
263 struct platform_device *pdev = to_platform_device(dev);
264 struct usb_hcd *hcd = dev_get_drvdata(dev);
266 return 0;
269 MODULE_ALIAS("au1xxx-ehci");
270 static struct platform_driver ehci_hcd_au1xxx_driver = {
271 .probe = ehci_hcd_au1xxx_drv_probe,
272 .remove = ehci_hcd_au1xxx_drv_remove,
273 .shutdown = usb_hcd_platform_shutdown,
274 /*.suspend = ehci_hcd_au1xxx_drv_suspend, */
275 /*.resume = ehci_hcd_au1xxx_drv_resume, */
276 .driver = {
277 .name = "au1xxx-ehci",
278 .bus = &platform_bus_type