1 /*
2 * SAMSUNG S5P USB HOST EHCI Controller
3 *
4 * Copyright (C) 2011 Samsung Electronics Co.Ltd
5 * Author: Jingoo Han <jg1.han@samsung.com>
6 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15 #include <linux/clk.h>
16 #include <linux/platform_device.h>
17 #include <plat/ehci.h>
18 #include <plat/usb-phy.h>
19
20 struct s5p_ehci_hcd {
21 struct device *dev;
22 struct usb_hcd *hcd;
23 struct clk *clk;
24 };
25
26 static const struct hc_driver s5p_ehci_hc_driver = {
27 .description = hcd_name,
28 .product_desc = "S5P EHCI Host Controller",
29 .hcd_priv_size = sizeof(struct ehci_hcd),
30
31 .irq = ehci_irq,
32 .flags = HCD_MEMORY | HCD_USB2,
33
34 .reset = ehci_init,
35 .start = ehci_run,
36 .stop = ehci_stop,
37 .shutdown = ehci_shutdown,
38
39 .get_frame_number = ehci_get_frame,
40
41 .urb_enqueue = ehci_urb_enqueue,
42 .urb_dequeue = ehci_urb_dequeue,
43 .endpoint_disable = ehci_endpoint_disable,
44 .endpoint_reset = ehci_endpoint_reset,
45
46 .hub_status_data = ehci_hub_status_data,
47 .hub_control = ehci_hub_control,
48 .bus_suspend = ehci_bus_suspend,
49 .bus_resume = ehci_bus_resume,
50
51 .relinquish_port = ehci_relinquish_port,
52 .port_handed_over = ehci_port_handed_over,
53
54 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
55 };
56
s5p_ehci_probe(struct platform_device * pdev)57 static int __devinit s5p_ehci_probe(struct platform_device *pdev)
58 {
59 struct s5p_ehci_platdata *pdata;
60 struct s5p_ehci_hcd *s5p_ehci;
61 struct usb_hcd *hcd;
62 struct ehci_hcd *ehci;
63 struct resource *res;
64 int irq;
65 int err;
66
67 pdata = pdev->dev.platform_data;
68 if (!pdata) {
69 dev_err(&pdev->dev, "No platform data defined\n");
70 return -EINVAL;
71 }
72
73 s5p_ehci = kzalloc(sizeof(struct s5p_ehci_hcd), GFP_KERNEL);
74 if (!s5p_ehci)
75 return -ENOMEM;
76
77 s5p_ehci->dev = &pdev->dev;
78
79 hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev,
80 dev_name(&pdev->dev));
81 if (!hcd) {
82 dev_err(&pdev->dev, "Unable to create HCD\n");
83 err = -ENOMEM;
84 goto fail_hcd;
85 }
86
87 s5p_ehci->hcd = hcd;
88 s5p_ehci->clk = clk_get(&pdev->dev, "usbhost");
89
90 if (IS_ERR(s5p_ehci->clk)) {
91 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
92 err = PTR_ERR(s5p_ehci->clk);
93 goto fail_clk;
94 }
95
96 err = clk_enable(s5p_ehci->clk);
97 if (err)
98 goto fail_clken;
99
100 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
101 if (!res) {
102 dev_err(&pdev->dev, "Failed to get I/O memory\n");
103 err = -ENXIO;
104 goto fail_io;
105 }
106
107 hcd->rsrc_start = res->start;
108 hcd->rsrc_len = resource_size(res);
109 hcd->regs = ioremap(res->start, resource_size(res));
110 if (!hcd->regs) {
111 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
112 err = -ENOMEM;
113 goto fail_io;
114 }
115
116 irq = platform_get_irq(pdev, 0);
117 if (!irq) {
118 dev_err(&pdev->dev, "Failed to get IRQ\n");
119 err = -ENODEV;
120 goto fail;
121 }
122
123 if (pdata->phy_init)
124 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
125
126 ehci = hcd_to_ehci(hcd);
127 ehci->caps = hcd->regs;
128 ehci->regs = hcd->regs +
129 HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
130
131 dbg_hcs_params(ehci, "reset");
132 dbg_hcc_params(ehci, "reset");
133
134 /* cache this readonly data; minimize chip reads */
135 ehci->hcs_params = readl(&ehci->caps->hcs_params);
136
137 ehci_reset(ehci);
138
139 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
140 if (err) {
141 dev_err(&pdev->dev, "Failed to add USB HCD\n");
142 goto fail;
143 }
144
145 platform_set_drvdata(pdev, s5p_ehci);
146
147 return 0;
148
149 fail:
150 iounmap(hcd->regs);
151 fail_io:
152 clk_disable(s5p_ehci->clk);
153 fail_clken:
154 clk_put(s5p_ehci->clk);
155 fail_clk:
156 usb_put_hcd(hcd);
157 fail_hcd:
158 kfree(s5p_ehci);
159 return err;
160 }
161
s5p_ehci_remove(struct platform_device * pdev)162 static int __devexit s5p_ehci_remove(struct platform_device *pdev)
163 {
164 struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
165 struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
166 struct usb_hcd *hcd = s5p_ehci->hcd;
167
168 usb_remove_hcd(hcd);
169
170 if (pdata && pdata->phy_exit)
171 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
172
173 iounmap(hcd->regs);
174
175 clk_disable(s5p_ehci->clk);
176 clk_put(s5p_ehci->clk);
177
178 usb_put_hcd(hcd);
179 kfree(s5p_ehci);
180
181 return 0;
182 }
183
s5p_ehci_shutdown(struct platform_device * pdev)184 static void s5p_ehci_shutdown(struct platform_device *pdev)
185 {
186 struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
187 struct usb_hcd *hcd = s5p_ehci->hcd;
188
189 if (hcd->driver->shutdown)
190 hcd->driver->shutdown(hcd);
191 }
192
193 #ifdef CONFIG_PM
s5p_ehci_suspend(struct device * dev)194 static int s5p_ehci_suspend(struct device *dev)
195 {
196 struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
197 struct usb_hcd *hcd = s5p_ehci->hcd;
198 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
199 struct platform_device *pdev = to_platform_device(dev);
200 struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
201 unsigned long flags;
202 int rc = 0;
203
204 if (time_before(jiffies, ehci->next_statechange))
205 msleep(20);
206
207 /*
208 * Root hub was already suspended. Disable irq emission and
209 * mark HW unaccessible. The PM and USB cores make sure that
210 * the root hub is either suspended or stopped.
211 */
212 ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
213 spin_lock_irqsave(&ehci->lock, flags);
214 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
215 (void)ehci_readl(ehci, &ehci->regs->intr_enable);
216
217 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
218 spin_unlock_irqrestore(&ehci->lock, flags);
219
220 if (pdata && pdata->phy_exit)
221 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
222
223 return rc;
224 }
225
s5p_ehci_resume(struct device * dev)226 static int s5p_ehci_resume(struct device *dev)
227 {
228 struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
229 struct usb_hcd *hcd = s5p_ehci->hcd;
230 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
231 struct platform_device *pdev = to_platform_device(dev);
232 struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
233
234 if (pdata && pdata->phy_init)
235 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
236
237 if (time_before(jiffies, ehci->next_statechange))
238 msleep(100);
239
240 /* Mark hardware accessible again as we are out of D3 state by now */
241 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
242
243 if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
244 int mask = INTR_MASK;
245
246 ehci_prepare_ports_for_controller_resume(ehci);
247 if (!hcd->self.root_hub->do_remote_wakeup)
248 mask &= ~STS_PCD;
249 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
250 ehci_readl(ehci, &ehci->regs->intr_enable);
251 return 0;
252 }
253
254 usb_root_hub_lost_power(hcd->self.root_hub);
255
256 (void) ehci_halt(ehci);
257 (void) ehci_reset(ehci);
258
259 /* emptying the schedule aborts any urbs */
260 spin_lock_irq(&ehci->lock);
261 if (ehci->reclaim)
262 end_unlink_async(ehci);
263 ehci_work(ehci);
264 spin_unlock_irq(&ehci->lock);
265
266 ehci_writel(ehci, ehci->command, &ehci->regs->command);
267 ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
268 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
269
270 /* here we "know" root ports should always stay powered */
271 ehci_port_power(ehci, 1);
272
273 ehci->rh_state = EHCI_RH_SUSPENDED;
274
275 return 0;
276 }
277 #else
278 #define s5p_ehci_suspend NULL
279 #define s5p_ehci_resume NULL
280 #endif
281
282 static const struct dev_pm_ops s5p_ehci_pm_ops = {
283 .suspend = s5p_ehci_suspend,
284 .resume = s5p_ehci_resume,
285 };
286
287 static struct platform_driver s5p_ehci_driver = {
288 .probe = s5p_ehci_probe,
289 .remove = __devexit_p(s5p_ehci_remove),
290 .shutdown = s5p_ehci_shutdown,
291 .driver = {
292 .name = "s5p-ehci",
293 .owner = THIS_MODULE,
294 .pm = &s5p_ehci_pm_ops,
295 }
296 };
297
298 MODULE_ALIAS("platform:s5p-ehci");
299