1 /*
2 * SAMSUNG EXYNOS USB HOST OHCI Controller
3 *
4 * Copyright (C) 2011 Samsung Electronics Co.Ltd
5 * Author: Jingoo Han <jg1.han@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 *
12 */
13
14 #include <linux/clk.h>
15 #include <linux/platform_device.h>
16 #include <mach/ohci.h>
17 #include <plat/usb-phy.h>
18
19 struct exynos_ohci_hcd {
20 struct device *dev;
21 struct usb_hcd *hcd;
22 struct clk *clk;
23 };
24
ohci_exynos_start(struct usb_hcd * hcd)25 static int ohci_exynos_start(struct usb_hcd *hcd)
26 {
27 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
28 int ret;
29
30 ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
31
32 ret = ohci_init(ohci);
33 if (ret < 0)
34 return ret;
35
36 ret = ohci_run(ohci);
37 if (ret < 0) {
38 err("can't start %s", hcd->self.bus_name);
39 ohci_stop(hcd);
40 return ret;
41 }
42
43 return 0;
44 }
45
46 static const struct hc_driver exynos_ohci_hc_driver = {
47 .description = hcd_name,
48 .product_desc = "EXYNOS OHCI Host Controller",
49 .hcd_priv_size = sizeof(struct ohci_hcd),
50
51 .irq = ohci_irq,
52 .flags = HCD_MEMORY|HCD_USB11,
53
54 .start = ohci_exynos_start,
55 .stop = ohci_stop,
56 .shutdown = ohci_shutdown,
57
58 .get_frame_number = ohci_get_frame,
59
60 .urb_enqueue = ohci_urb_enqueue,
61 .urb_dequeue = ohci_urb_dequeue,
62 .endpoint_disable = ohci_endpoint_disable,
63
64 .hub_status_data = ohci_hub_status_data,
65 .hub_control = ohci_hub_control,
66 #ifdef CONFIG_PM
67 .bus_suspend = ohci_bus_suspend,
68 .bus_resume = ohci_bus_resume,
69 #endif
70 .start_port_reset = ohci_start_port_reset,
71 };
72
exynos_ohci_probe(struct platform_device * pdev)73 static int __devinit exynos_ohci_probe(struct platform_device *pdev)
74 {
75 struct exynos4_ohci_platdata *pdata;
76 struct exynos_ohci_hcd *exynos_ohci;
77 struct usb_hcd *hcd;
78 struct ohci_hcd *ohci;
79 struct resource *res;
80 int irq;
81 int err;
82
83 pdata = pdev->dev.platform_data;
84 if (!pdata) {
85 dev_err(&pdev->dev, "No platform data defined\n");
86 return -EINVAL;
87 }
88
89 exynos_ohci = kzalloc(sizeof(struct exynos_ohci_hcd), GFP_KERNEL);
90 if (!exynos_ohci)
91 return -ENOMEM;
92
93 exynos_ohci->dev = &pdev->dev;
94
95 hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
96 dev_name(&pdev->dev));
97 if (!hcd) {
98 dev_err(&pdev->dev, "Unable to create HCD\n");
99 err = -ENOMEM;
100 goto fail_hcd;
101 }
102
103 exynos_ohci->hcd = hcd;
104 exynos_ohci->clk = clk_get(&pdev->dev, "usbhost");
105
106 if (IS_ERR(exynos_ohci->clk)) {
107 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
108 err = PTR_ERR(exynos_ohci->clk);
109 goto fail_clk;
110 }
111
112 err = clk_enable(exynos_ohci->clk);
113 if (err)
114 goto fail_clken;
115
116 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
117 if (!res) {
118 dev_err(&pdev->dev, "Failed to get I/O memory\n");
119 err = -ENXIO;
120 goto fail_io;
121 }
122
123 hcd->rsrc_start = res->start;
124 hcd->rsrc_len = resource_size(res);
125 hcd->regs = ioremap(res->start, resource_size(res));
126 if (!hcd->regs) {
127 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
128 err = -ENOMEM;
129 goto fail_io;
130 }
131
132 irq = platform_get_irq(pdev, 0);
133 if (!irq) {
134 dev_err(&pdev->dev, "Failed to get IRQ\n");
135 err = -ENODEV;
136 goto fail;
137 }
138
139 if (pdata->phy_init)
140 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
141
142 ohci = hcd_to_ohci(hcd);
143 ohci_hcd_init(ohci);
144
145 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
146 if (err) {
147 dev_err(&pdev->dev, "Failed to add USB HCD\n");
148 goto fail;
149 }
150
151 platform_set_drvdata(pdev, exynos_ohci);
152
153 return 0;
154
155 fail:
156 iounmap(hcd->regs);
157 fail_io:
158 clk_disable(exynos_ohci->clk);
159 fail_clken:
160 clk_put(exynos_ohci->clk);
161 fail_clk:
162 usb_put_hcd(hcd);
163 fail_hcd:
164 kfree(exynos_ohci);
165 return err;
166 }
167
exynos_ohci_remove(struct platform_device * pdev)168 static int __devexit exynos_ohci_remove(struct platform_device *pdev)
169 {
170 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
171 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
172 struct usb_hcd *hcd = exynos_ohci->hcd;
173
174 usb_remove_hcd(hcd);
175
176 if (pdata && pdata->phy_exit)
177 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
178
179 iounmap(hcd->regs);
180
181 clk_disable(exynos_ohci->clk);
182 clk_put(exynos_ohci->clk);
183
184 usb_put_hcd(hcd);
185 kfree(exynos_ohci);
186
187 return 0;
188 }
189
exynos_ohci_shutdown(struct platform_device * pdev)190 static void exynos_ohci_shutdown(struct platform_device *pdev)
191 {
192 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
193 struct usb_hcd *hcd = exynos_ohci->hcd;
194
195 if (hcd->driver->shutdown)
196 hcd->driver->shutdown(hcd);
197 }
198
199 #ifdef CONFIG_PM
exynos_ohci_suspend(struct device * dev)200 static int exynos_ohci_suspend(struct device *dev)
201 {
202 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
203 struct usb_hcd *hcd = exynos_ohci->hcd;
204 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
205 struct platform_device *pdev = to_platform_device(dev);
206 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
207 unsigned long flags;
208 int rc = 0;
209
210 /*
211 * Root hub was already suspended. Disable irq emission and
212 * mark HW unaccessible, bail out if RH has been resumed. Use
213 * the spinlock to properly synchronize with possible pending
214 * RH suspend or resume activity.
215 */
216 spin_lock_irqsave(&ohci->lock, flags);
217 if (ohci->rh_state != OHCI_RH_SUSPENDED &&
218 ohci->rh_state != OHCI_RH_HALTED) {
219 rc = -EINVAL;
220 goto fail;
221 }
222
223 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
224
225 if (pdata && pdata->phy_exit)
226 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
227 fail:
228 spin_unlock_irqrestore(&ohci->lock, flags);
229
230 return rc;
231 }
232
exynos_ohci_resume(struct device * dev)233 static int exynos_ohci_resume(struct device *dev)
234 {
235 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
236 struct usb_hcd *hcd = exynos_ohci->hcd;
237 struct platform_device *pdev = to_platform_device(dev);
238 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
239
240 if (pdata && pdata->phy_init)
241 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
242
243 /* Mark hardware accessible again as we are out of D3 state by now */
244 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
245
246 ohci_finish_controller_resume(hcd);
247
248 return 0;
249 }
250 #else
251 #define exynos_ohci_suspend NULL
252 #define exynos_ohci_resume NULL
253 #endif
254
255 static const struct dev_pm_ops exynos_ohci_pm_ops = {
256 .suspend = exynos_ohci_suspend,
257 .resume = exynos_ohci_resume,
258 };
259
260 static struct platform_driver exynos_ohci_driver = {
261 .probe = exynos_ohci_probe,
262 .remove = __devexit_p(exynos_ohci_remove),
263 .shutdown = exynos_ohci_shutdown,
264 .driver = {
265 .name = "exynos-ohci",
266 .owner = THIS_MODULE,
267 .pm = &exynos_ohci_pm_ops,
268 }
269 };
270
271 MODULE_ALIAS("platform:exynos-ohci");
272 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
273