diff options
Diffstat (limited to 'drivers/usb/host/ehci-au1xxx.c')
-rw-r--r-- | drivers/usb/host/ehci-au1xxx.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-au1xxx.c b/drivers/usb/host/ehci-au1xxx.c new file mode 100644 index 00000000000..42ae5740990 --- /dev/null +++ b/drivers/usb/host/ehci-au1xxx.c | |||
@@ -0,0 +1,323 @@ | |||
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_UCECLKEN (1<<18) | ||
23 | #define USB_MCFG_EHCCLKEN (1<<17) | ||
24 | #ifdef CONFIG_DMA_COHERENT | ||
25 | #define USB_MCFG_UCAM (1<<7) | ||
26 | #else | ||
27 | #define USB_MCFG_UCAM (0) | ||
28 | #endif | ||
29 | #define USB_MCFG_EBMEN (1<<3) | ||
30 | #define USB_MCFG_EMEMEN (1<<2) | ||
31 | |||
32 | #define USBH_ENABLE_CE (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN) | ||
33 | #define USBH_ENABLE_INIT (USB_MCFG_PFEN | USB_MCFG_RDCOMB | \ | ||
34 | USBH_ENABLE_CE | USB_MCFG_SSDEN | \ | ||
35 | USB_MCFG_UCAM | USB_MCFG_EBMEN | \ | ||
36 | USB_MCFG_EMEMEN) | ||
37 | |||
38 | #define USBH_DISABLE (USB_MCFG_EBMEN | USB_MCFG_EMEMEN) | ||
39 | |||
40 | extern int usb_disabled(void); | ||
41 | |||
42 | static void au1xxx_start_ehc(void) | ||
43 | { | ||
44 | /* enable clock to EHCI block and HS PHY PLL*/ | ||
45 | au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_CE, USB_HOST_CONFIG); | ||
46 | au_sync(); | ||
47 | udelay(1000); | ||
48 | |||
49 | /* enable EHCI mmio */ | ||
50 | au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG); | ||
51 | au_sync(); | ||
52 | udelay(1000); | ||
53 | } | ||
54 | |||
55 | static void au1xxx_stop_ehc(void) | ||
56 | { | ||
57 | unsigned long c; | ||
58 | |||
59 | /* Disable mem */ | ||
60 | au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_DISABLE, USB_HOST_CONFIG); | ||
61 | au_sync(); | ||
62 | udelay(1000); | ||
63 | |||
64 | /* Disable EHC clock. If the HS PHY is unused disable it too. */ | ||
65 | c = au_readl(USB_HOST_CONFIG) & ~USB_MCFG_EHCCLKEN; | ||
66 | if (!(c & USB_MCFG_UCECLKEN)) /* UDC disabled? */ | ||
67 | c &= ~USB_MCFG_PHYPLLEN; /* yes: disable HS PHY PLL */ | ||
68 | au_writel(c, USB_HOST_CONFIG); | ||
69 | au_sync(); | ||
70 | } | ||
71 | |||
72 | static int au1xxx_ehci_setup(struct usb_hcd *hcd) | ||
73 | { | ||
74 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | ||
75 | int ret = ehci_init(hcd); | ||
76 | |||
77 | ehci->need_io_watchdog = 0; | ||
78 | return ret; | ||
79 | } | ||
80 | |||
81 | static const struct hc_driver ehci_au1xxx_hc_driver = { | ||
82 | .description = hcd_name, | ||
83 | .product_desc = "Au1xxx EHCI", | ||
84 | .hcd_priv_size = sizeof(struct ehci_hcd), | ||
85 | |||
86 | /* | ||
87 | * generic hardware linkage | ||
88 | */ | ||
89 | .irq = ehci_irq, | ||
90 | .flags = HCD_MEMORY | HCD_USB2, | ||
91 | |||
92 | /* | ||
93 | * basic lifecycle operations | ||
94 | * | ||
95 | * FIXME -- ehci_init() doesn't do enough here. | ||
96 | * See ehci-ppc-soc for a complete implementation. | ||
97 | */ | ||
98 | .reset = au1xxx_ehci_setup, | ||
99 | .start = ehci_run, | ||
100 | .stop = ehci_stop, | ||
101 | .shutdown = ehci_shutdown, | ||
102 | |||
103 | /* | ||
104 | * managing i/o requests and associated device resources | ||
105 | */ | ||
106 | .urb_enqueue = ehci_urb_enqueue, | ||
107 | .urb_dequeue = ehci_urb_dequeue, | ||
108 | .endpoint_disable = ehci_endpoint_disable, | ||
109 | .endpoint_reset = ehci_endpoint_reset, | ||
110 | |||
111 | /* | ||
112 | * scheduling support | ||
113 | */ | ||
114 | .get_frame_number = ehci_get_frame, | ||
115 | |||
116 | /* | ||
117 | * root hub support | ||
118 | */ | ||
119 | .hub_status_data = ehci_hub_status_data, | ||
120 | .hub_control = ehci_hub_control, | ||
121 | .bus_suspend = ehci_bus_suspend, | ||
122 | .bus_resume = ehci_bus_resume, | ||
123 | .relinquish_port = ehci_relinquish_port, | ||
124 | .port_handed_over = ehci_port_handed_over, | ||
125 | |||
126 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | ||
127 | }; | ||
128 | |||
129 | static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev) | ||
130 | { | ||
131 | struct usb_hcd *hcd; | ||
132 | struct ehci_hcd *ehci; | ||
133 | struct resource *res; | ||
134 | int ret; | ||
135 | |||
136 | if (usb_disabled()) | ||
137 | return -ENODEV; | ||
138 | |||
139 | #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT) | ||
140 | /* Au1200 AB USB does not support coherent memory */ | ||
141 | if (!(read_c0_prid() & 0xff)) { | ||
142 | printk(KERN_INFO "%s: this is chip revision AB!\n", pdev->name); | ||
143 | printk(KERN_INFO "%s: update your board or re-configure" | ||
144 | " the kernel\n", pdev->name); | ||
145 | return -ENODEV; | ||
146 | } | ||
147 | #endif | ||
148 | |||
149 | if (pdev->resource[1].flags != IORESOURCE_IRQ) { | ||
150 | pr_debug("resource[1] is not IORESOURCE_IRQ"); | ||
151 | return -ENOMEM; | ||
152 | } | ||
153 | hcd = usb_create_hcd(&ehci_au1xxx_hc_driver, &pdev->dev, "Au1xxx"); | ||
154 | if (!hcd) | ||
155 | return -ENOMEM; | ||
156 | |||
157 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
158 | hcd->rsrc_start = res->start; | ||
159 | hcd->rsrc_len = resource_size(res); | ||
160 | |||
161 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { | ||
162 | pr_debug("request_mem_region failed"); | ||
163 | ret = -EBUSY; | ||
164 | goto err1; | ||
165 | } | ||
166 | |||
167 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); | ||
168 | if (!hcd->regs) { | ||
169 | pr_debug("ioremap failed"); | ||
170 | ret = -ENOMEM; | ||
171 | goto err2; | ||
172 | } | ||
173 | |||
174 | au1xxx_start_ehc(); | ||
175 | |||
176 | ehci = hcd_to_ehci(hcd); | ||
177 | ehci->caps = hcd->regs; | ||
178 | ehci->regs = hcd->regs + | ||
179 | HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase)); | ||
180 | /* cache this readonly data; minimize chip reads */ | ||
181 | ehci->hcs_params = readl(&ehci->caps->hcs_params); | ||
182 | |||
183 | ret = usb_add_hcd(hcd, pdev->resource[1].start, | ||
184 | IRQF_DISABLED | IRQF_SHARED); | ||
185 | if (ret == 0) { | ||
186 | platform_set_drvdata(pdev, hcd); | ||
187 | return ret; | ||
188 | } | ||
189 | |||
190 | au1xxx_stop_ehc(); | ||
191 | iounmap(hcd->regs); | ||
192 | err2: | ||
193 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | ||
194 | err1: | ||
195 | usb_put_hcd(hcd); | ||
196 | return ret; | ||
197 | } | ||
198 | |||
199 | static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev) | ||
200 | { | ||
201 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | ||
202 | |||
203 | usb_remove_hcd(hcd); | ||
204 | iounmap(hcd->regs); | ||
205 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | ||
206 | usb_put_hcd(hcd); | ||
207 | au1xxx_stop_ehc(); | ||
208 | platform_set_drvdata(pdev, NULL); | ||
209 | |||
210 | return 0; | ||
211 | } | ||
212 | |||
213 | #ifdef CONFIG_PM | ||
214 | static int ehci_hcd_au1xxx_drv_suspend(struct device *dev) | ||
215 | { | ||
216 | struct usb_hcd *hcd = dev_get_drvdata(dev); | ||
217 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | ||
218 | unsigned long flags; | ||
219 | int rc = 0; | ||
220 | |||
221 | if (time_before(jiffies, ehci->next_statechange)) | ||
222 | msleep(10); | ||
223 | |||
224 | /* Root hub was already suspended. Disable irq emission and | ||
225 | * mark HW unaccessible. The PM and USB cores make sure that | ||
226 | * the root hub is either suspended or stopped. | ||
227 | */ | ||
228 | ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev)); | ||
229 | spin_lock_irqsave(&ehci->lock, flags); | ||
230 | ehci_writel(ehci, 0, &ehci->regs->intr_enable); | ||
231 | (void)ehci_readl(ehci, &ehci->regs->intr_enable); | ||
232 | |||
233 | clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); | ||
234 | spin_unlock_irqrestore(&ehci->lock, flags); | ||
235 | |||
236 | // could save FLADJ in case of Vaux power loss | ||
237 | // ... we'd only use it to handle clock skew | ||
238 | |||
239 | au1xxx_stop_ehc(); | ||
240 | |||
241 | return rc; | ||
242 | } | ||
243 | |||
244 | static int ehci_hcd_au1xxx_drv_resume(struct device *dev) | ||
245 | { | ||
246 | struct usb_hcd *hcd = dev_get_drvdata(dev); | ||
247 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | ||
248 | |||
249 | au1xxx_start_ehc(); | ||
250 | |||
251 | // maybe restore FLADJ | ||
252 | |||
253 | if (time_before(jiffies, ehci->next_statechange)) | ||
254 | msleep(100); | ||
255 | |||
256 | /* Mark hardware accessible again as we are out of D3 state by now */ | ||
257 | set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); | ||
258 | |||
259 | /* If CF is still set, we maintained PCI Vaux power. | ||
260 | * Just undo the effect of ehci_pci_suspend(). | ||
261 | */ | ||
262 | if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) { | ||
263 | int mask = INTR_MASK; | ||
264 | |||
265 | ehci_prepare_ports_for_controller_resume(ehci); | ||
266 | if (!hcd->self.root_hub->do_remote_wakeup) | ||
267 | mask &= ~STS_PCD; | ||
268 | ehci_writel(ehci, mask, &ehci->regs->intr_enable); | ||
269 | ehci_readl(ehci, &ehci->regs->intr_enable); | ||
270 | return 0; | ||
271 | } | ||
272 | |||
273 | ehci_dbg(ehci, "lost power, restarting\n"); | ||
274 | usb_root_hub_lost_power(hcd->self.root_hub); | ||
275 | |||
276 | /* Else reset, to cope with power loss or flush-to-storage | ||
277 | * style "resume" having let BIOS kick in during reboot. | ||
278 | */ | ||
279 | (void) ehci_halt(ehci); | ||
280 | (void) ehci_reset(ehci); | ||
281 | |||
282 | /* emptying the schedule aborts any urbs */ | ||
283 | spin_lock_irq(&ehci->lock); | ||
284 | if (ehci->reclaim) | ||
285 | end_unlink_async(ehci); | ||
286 | ehci_work(ehci); | ||
287 | spin_unlock_irq(&ehci->lock); | ||
288 | |||
289 | ehci_writel(ehci, ehci->command, &ehci->regs->command); | ||
290 | ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); | ||
291 | ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ | ||
292 | |||
293 | /* here we "know" root ports should always stay powered */ | ||
294 | ehci_port_power(ehci, 1); | ||
295 | |||
296 | hcd->state = HC_STATE_SUSPENDED; | ||
297 | |||
298 | return 0; | ||
299 | } | ||
300 | |||
301 | static const struct dev_pm_ops au1xxx_ehci_pmops = { | ||
302 | .suspend = ehci_hcd_au1xxx_drv_suspend, | ||
303 | .resume = ehci_hcd_au1xxx_drv_resume, | ||
304 | }; | ||
305 | |||
306 | #define AU1XXX_EHCI_PMOPS &au1xxx_ehci_pmops | ||
307 | |||
308 | #else | ||
309 | #define AU1XXX_EHCI_PMOPS NULL | ||
310 | #endif | ||
311 | |||
312 | static struct platform_driver ehci_hcd_au1xxx_driver = { | ||
313 | .probe = ehci_hcd_au1xxx_drv_probe, | ||
314 | .remove = ehci_hcd_au1xxx_drv_remove, | ||
315 | .shutdown = usb_hcd_platform_shutdown, | ||
316 | .driver = { | ||
317 | .name = "au1xxx-ehci", | ||
318 | .owner = THIS_MODULE, | ||
319 | .pm = AU1XXX_EHCI_PMOPS, | ||
320 | } | ||
321 | }; | ||
322 | |||
323 | MODULE_ALIAS("platform:au1xxx-ehci"); | ||