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
18 extern int usb_disabled(void);
19
au1xxx_ehci_setup(struct usb_hcd * hcd)20 static int au1xxx_ehci_setup(struct usb_hcd *hcd)
21 {
22 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
23 int ret = ehci_init(hcd);
24
25 ehci->need_io_watchdog = 0;
26 ehci_reset(ehci);
27 return ret;
28 }
29
30 static const struct hc_driver ehci_au1xxx_hc_driver = {
31 .description = hcd_name,
32 .product_desc = "Au1xxx EHCI",
33 .hcd_priv_size = sizeof(struct ehci_hcd),
34
35 /*
36 * generic hardware linkage
37 */
38 .irq = ehci_irq,
39 .flags = HCD_MEMORY | HCD_USB2,
40
41 /*
42 * basic lifecycle operations
43 *
44 * FIXME -- ehci_init() doesn't do enough here.
45 * See ehci-ppc-soc for a complete implementation.
46 */
47 .reset = au1xxx_ehci_setup,
48 .start = ehci_run,
49 .stop = ehci_stop,
50 .shutdown = ehci_shutdown,
51
52 /*
53 * managing i/o requests and associated device resources
54 */
55 .urb_enqueue = ehci_urb_enqueue,
56 .urb_dequeue = ehci_urb_dequeue,
57 .endpoint_disable = ehci_endpoint_disable,
58 .endpoint_reset = ehci_endpoint_reset,
59
60 /*
61 * scheduling support
62 */
63 .get_frame_number = ehci_get_frame,
64
65 /*
66 * root hub support
67 */
68 .hub_status_data = ehci_hub_status_data,
69 .hub_control = ehci_hub_control,
70 .bus_suspend = ehci_bus_suspend,
71 .bus_resume = ehci_bus_resume,
72 .relinquish_port = ehci_relinquish_port,
73 .port_handed_over = ehci_port_handed_over,
74
75 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
76 };
77
ehci_hcd_au1xxx_drv_probe(struct platform_device * pdev)78 static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
79 {
80 struct usb_hcd *hcd;
81 struct ehci_hcd *ehci;
82 struct resource *res;
83 int ret;
84
85 if (usb_disabled())
86 return -ENODEV;
87
88 if (pdev->resource[1].flags != IORESOURCE_IRQ) {
89 pr_debug("resource[1] is not IORESOURCE_IRQ");
90 return -ENOMEM;
91 }
92 hcd = usb_create_hcd(&ehci_au1xxx_hc_driver, &pdev->dev, "Au1xxx");
93 if (!hcd)
94 return -ENOMEM;
95
96 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
97 hcd->rsrc_start = res->start;
98 hcd->rsrc_len = resource_size(res);
99
100 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
101 pr_debug("request_mem_region failed");
102 ret = -EBUSY;
103 goto err1;
104 }
105
106 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
107 if (!hcd->regs) {
108 pr_debug("ioremap failed");
109 ret = -ENOMEM;
110 goto err2;
111 }
112
113 if (alchemy_usb_control(ALCHEMY_USB_EHCI0, 1)) {
114 printk(KERN_INFO "%s: controller init failed!\n", pdev->name);
115 ret = -ENODEV;
116 goto err3;
117 }
118
119 ehci = hcd_to_ehci(hcd);
120 ehci->caps = hcd->regs;
121 ehci->regs = hcd->regs +
122 HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
123 /* cache this readonly data; minimize chip reads */
124 ehci->hcs_params = readl(&ehci->caps->hcs_params);
125
126 ret = usb_add_hcd(hcd, pdev->resource[1].start,
127 IRQF_SHARED);
128 if (ret == 0) {
129 platform_set_drvdata(pdev, hcd);
130 return ret;
131 }
132
133 alchemy_usb_control(ALCHEMY_USB_EHCI0, 0);
134 err3:
135 iounmap(hcd->regs);
136 err2:
137 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
138 err1:
139 usb_put_hcd(hcd);
140 return ret;
141 }
142
ehci_hcd_au1xxx_drv_remove(struct platform_device * pdev)143 static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
144 {
145 struct usb_hcd *hcd = platform_get_drvdata(pdev);
146
147 usb_remove_hcd(hcd);
148 alchemy_usb_control(ALCHEMY_USB_EHCI0, 0);
149 iounmap(hcd->regs);
150 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
151 usb_put_hcd(hcd);
152 platform_set_drvdata(pdev, NULL);
153
154 return 0;
155 }
156
157 #ifdef CONFIG_PM
ehci_hcd_au1xxx_drv_suspend(struct device * dev)158 static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
159 {
160 struct usb_hcd *hcd = dev_get_drvdata(dev);
161 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
162 unsigned long flags;
163 int rc = 0;
164
165 if (time_before(jiffies, ehci->next_statechange))
166 msleep(10);
167
168 /* Root hub was already suspended. Disable irq emission and
169 * mark HW unaccessible. The PM and USB cores make sure that
170 * the root hub is either suspended or stopped.
171 */
172 ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
173 spin_lock_irqsave(&ehci->lock, flags);
174 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
175 (void)ehci_readl(ehci, &ehci->regs->intr_enable);
176
177 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
178 spin_unlock_irqrestore(&ehci->lock, flags);
179
180 // could save FLADJ in case of Vaux power loss
181 // ... we'd only use it to handle clock skew
182
183 alchemy_usb_control(ALCHEMY_USB_EHCI0, 0);
184
185 return rc;
186 }
187
ehci_hcd_au1xxx_drv_resume(struct device * dev)188 static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
189 {
190 struct usb_hcd *hcd = dev_get_drvdata(dev);
191 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
192
193 alchemy_usb_control(ALCHEMY_USB_EHCI0, 1);
194
195 // maybe restore FLADJ
196
197 if (time_before(jiffies, ehci->next_statechange))
198 msleep(100);
199
200 /* Mark hardware accessible again as we are out of D3 state by now */
201 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
202
203 /* If CF is still set, we maintained PCI Vaux power.
204 * Just undo the effect of ehci_pci_suspend().
205 */
206 if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
207 int mask = INTR_MASK;
208
209 ehci_prepare_ports_for_controller_resume(ehci);
210 if (!hcd->self.root_hub->do_remote_wakeup)
211 mask &= ~STS_PCD;
212 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
213 ehci_readl(ehci, &ehci->regs->intr_enable);
214 return 0;
215 }
216
217 ehci_dbg(ehci, "lost power, restarting\n");
218 usb_root_hub_lost_power(hcd->self.root_hub);
219
220 /* Else reset, to cope with power loss or flush-to-storage
221 * style "resume" having let BIOS kick in during reboot.
222 */
223 (void) ehci_halt(ehci);
224 (void) ehci_reset(ehci);
225
226 /* emptying the schedule aborts any urbs */
227 spin_lock_irq(&ehci->lock);
228 if (ehci->reclaim)
229 end_unlink_async(ehci);
230 ehci_work(ehci);
231 spin_unlock_irq(&ehci->lock);
232
233 ehci_writel(ehci, ehci->command, &ehci->regs->command);
234 ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
235 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
236
237 /* here we "know" root ports should always stay powered */
238 ehci_port_power(ehci, 1);
239
240 ehci->rh_state = EHCI_RH_SUSPENDED;
241
242 return 0;
243 }
244
245 static const struct dev_pm_ops au1xxx_ehci_pmops = {
246 .suspend = ehci_hcd_au1xxx_drv_suspend,
247 .resume = ehci_hcd_au1xxx_drv_resume,
248 };
249
250 #define AU1XXX_EHCI_PMOPS &au1xxx_ehci_pmops
251
252 #else
253 #define AU1XXX_EHCI_PMOPS NULL
254 #endif
255
256 static struct platform_driver ehci_hcd_au1xxx_driver = {
257 .probe = ehci_hcd_au1xxx_drv_probe,
258 .remove = ehci_hcd_au1xxx_drv_remove,
259 .shutdown = usb_hcd_platform_shutdown,
260 .driver = {
261 .name = "au1xxx-ehci",
262 .owner = THIS_MODULE,
263 .pm = AU1XXX_EHCI_PMOPS,
264 }
265 };
266
267 MODULE_ALIAS("platform:au1xxx-ehci");
268