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1bcc5aa8 JS |
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 <mach/regs-pmu.h> | |
18 | #include <plat/cpu.h> | |
19 | #include <plat/ehci.h> | |
20 | #include <plat/usb-phy.h> | |
21 | ||
22 | struct s5p_ehci_hcd { | |
23 | struct device *dev; | |
24 | struct usb_hcd *hcd; | |
25 | struct clk *clk; | |
26 | }; | |
27 | ||
28 | static const struct hc_driver s5p_ehci_hc_driver = { | |
29 | .description = hcd_name, | |
30 | .product_desc = "S5P EHCI Host Controller", | |
31 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
32 | ||
33 | .irq = ehci_irq, | |
34 | .flags = HCD_MEMORY | HCD_USB2, | |
35 | ||
36 | .reset = ehci_init, | |
37 | .start = ehci_run, | |
38 | .stop = ehci_stop, | |
39 | .shutdown = ehci_shutdown, | |
40 | ||
41 | .get_frame_number = ehci_get_frame, | |
42 | ||
43 | .urb_enqueue = ehci_urb_enqueue, | |
44 | .urb_dequeue = ehci_urb_dequeue, | |
45 | .endpoint_disable = ehci_endpoint_disable, | |
46 | .endpoint_reset = ehci_endpoint_reset, | |
47 | ||
48 | .hub_status_data = ehci_hub_status_data, | |
49 | .hub_control = ehci_hub_control, | |
50 | .bus_suspend = ehci_bus_suspend, | |
51 | .bus_resume = ehci_bus_resume, | |
52 | ||
53 | .relinquish_port = ehci_relinquish_port, | |
54 | .port_handed_over = ehci_port_handed_over, | |
55 | ||
56 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
57 | }; | |
58 | ||
27362d46 | 59 | static int __devinit s5p_ehci_probe(struct platform_device *pdev) |
1bcc5aa8 JS |
60 | { |
61 | struct s5p_ehci_platdata *pdata; | |
62 | struct s5p_ehci_hcd *s5p_ehci; | |
63 | struct usb_hcd *hcd; | |
64 | struct ehci_hcd *ehci; | |
65 | struct resource *res; | |
66 | int irq; | |
67 | int err; | |
68 | ||
69 | pdata = pdev->dev.platform_data; | |
70 | if (!pdata) { | |
71 | dev_err(&pdev->dev, "No platform data defined\n"); | |
72 | return -EINVAL; | |
73 | } | |
74 | ||
75 | s5p_ehci = kzalloc(sizeof(struct s5p_ehci_hcd), GFP_KERNEL); | |
76 | if (!s5p_ehci) | |
77 | return -ENOMEM; | |
78 | ||
79 | s5p_ehci->dev = &pdev->dev; | |
80 | ||
81 | hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev, | |
82 | dev_name(&pdev->dev)); | |
83 | if (!hcd) { | |
84 | dev_err(&pdev->dev, "Unable to create HCD\n"); | |
85 | err = -ENOMEM; | |
86 | goto fail_hcd; | |
87 | } | |
88 | ||
e5d3d446 | 89 | s5p_ehci->hcd = hcd; |
1bcc5aa8 JS |
90 | s5p_ehci->clk = clk_get(&pdev->dev, "usbhost"); |
91 | ||
92 | if (IS_ERR(s5p_ehci->clk)) { | |
93 | dev_err(&pdev->dev, "Failed to get usbhost clock\n"); | |
94 | err = PTR_ERR(s5p_ehci->clk); | |
95 | goto fail_clk; | |
96 | } | |
97 | ||
98 | err = clk_enable(s5p_ehci->clk); | |
99 | if (err) | |
100 | goto fail_clken; | |
101 | ||
102 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
103 | if (!res) { | |
104 | dev_err(&pdev->dev, "Failed to get I/O memory\n"); | |
105 | err = -ENXIO; | |
106 | goto fail_io; | |
107 | } | |
108 | ||
109 | hcd->rsrc_start = res->start; | |
110 | hcd->rsrc_len = resource_size(res); | |
111 | hcd->regs = ioremap(res->start, resource_size(res)); | |
112 | if (!hcd->regs) { | |
113 | dev_err(&pdev->dev, "Failed to remap I/O memory\n"); | |
114 | err = -ENOMEM; | |
115 | goto fail_io; | |
116 | } | |
117 | ||
118 | irq = platform_get_irq(pdev, 0); | |
119 | if (!irq) { | |
120 | dev_err(&pdev->dev, "Failed to get IRQ\n"); | |
121 | err = -ENODEV; | |
122 | goto fail; | |
123 | } | |
124 | ||
125 | if (pdata->phy_init) | |
126 | pdata->phy_init(pdev, S5P_USB_PHY_HOST); | |
127 | ||
128 | ehci = hcd_to_ehci(hcd); | |
129 | ehci->caps = hcd->regs; | |
c430131a JA |
130 | ehci->regs = hcd->regs + |
131 | HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase)); | |
1bcc5aa8 JS |
132 | |
133 | dbg_hcs_params(ehci, "reset"); | |
134 | dbg_hcc_params(ehci, "reset"); | |
135 | ||
136 | /* cache this readonly data; minimize chip reads */ | |
137 | ehci->hcs_params = readl(&ehci->caps->hcs_params); | |
138 | ||
b5dd18d8 | 139 | err = usb_add_hcd(hcd, irq, IRQF_SHARED); |
1bcc5aa8 JS |
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 | ||
27362d46 | 162 | static int __devexit s5p_ehci_remove(struct platform_device *pdev) |
1bcc5aa8 JS |
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 | ||
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 | ||
1acb30ef JH |
193 | #ifdef CONFIG_PM |
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 | ||
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 | ||
e8799906 | 273 | ehci->rh_state = EHCI_RH_SUSPENDED; |
1acb30ef JH |
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 | ||
1bcc5aa8 JS |
287 | static struct platform_driver s5p_ehci_driver = { |
288 | .probe = s5p_ehci_probe, | |
27362d46 | 289 | .remove = __devexit_p(s5p_ehci_remove), |
1bcc5aa8 JS |
290 | .shutdown = s5p_ehci_shutdown, |
291 | .driver = { | |
292 | .name = "s5p-ehci", | |
293 | .owner = THIS_MODULE, | |
1acb30ef | 294 | .pm = &s5p_ehci_pm_ops, |
1bcc5aa8 JS |
295 | } |
296 | }; | |
297 | ||
298 | MODULE_ALIAS("platform:s5p-ehci"); |