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9#include <linux/clk.h>
10#include <linux/dma-mapping.h>
11#include <linux/io.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16#include <linux/phy/phy.h>
17#include <linux/usb.h>
18#include <linux/usb/hcd.h>
19
20#include "ohci.h"
21
22#define DRIVER_DESC "OHCI EXYNOS driver"
23
24static const char hcd_name[] = "ohci-exynos";
25static struct hc_driver __read_mostly exynos_ohci_hc_driver;
26
27#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
28
29#define PHY_NUMBER 3
30
31struct exynos_ohci_hcd {
32 struct clk *clk;
33 struct device_node *of_node;
34 struct phy *phy[PHY_NUMBER];
35};
36
37static int exynos_ohci_get_phy(struct device *dev,
38 struct exynos_ohci_hcd *exynos_ohci)
39{
40 struct device_node *child;
41 struct phy *phy;
42 int phy_number;
43 int ret;
44
45
46 for_each_available_child_of_node(dev->of_node, child) {
47 ret = of_property_read_u32(child, "reg", &phy_number);
48 if (ret) {
49 dev_err(dev, "Failed to parse device tree\n");
50 of_node_put(child);
51 return ret;
52 }
53
54 if (phy_number >= PHY_NUMBER) {
55 dev_err(dev, "Invalid number of PHYs\n");
56 of_node_put(child);
57 return -EINVAL;
58 }
59
60 phy = devm_of_phy_get(dev, child, NULL);
61 exynos_ohci->phy[phy_number] = phy;
62 if (IS_ERR(phy)) {
63 ret = PTR_ERR(phy);
64 if (ret == -EPROBE_DEFER) {
65 of_node_put(child);
66 return ret;
67 } else if (ret != -ENOSYS && ret != -ENODEV) {
68 dev_err(dev,
69 "Error retrieving usb2 phy: %d\n", ret);
70 of_node_put(child);
71 return ret;
72 }
73 }
74 }
75
76 return 0;
77}
78
79static int exynos_ohci_phy_enable(struct device *dev)
80{
81 struct usb_hcd *hcd = dev_get_drvdata(dev);
82 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
83 int i;
84 int ret = 0;
85
86 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
87 if (!IS_ERR(exynos_ohci->phy[i]))
88 ret = phy_power_on(exynos_ohci->phy[i]);
89 if (ret)
90 for (i--; i >= 0; i--)
91 if (!IS_ERR(exynos_ohci->phy[i]))
92 phy_power_off(exynos_ohci->phy[i]);
93
94 return ret;
95}
96
97static void exynos_ohci_phy_disable(struct device *dev)
98{
99 struct usb_hcd *hcd = dev_get_drvdata(dev);
100 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
101 int i;
102
103 for (i = 0; i < PHY_NUMBER; i++)
104 if (!IS_ERR(exynos_ohci->phy[i]))
105 phy_power_off(exynos_ohci->phy[i]);
106}
107
108static int exynos_ohci_probe(struct platform_device *pdev)
109{
110 struct exynos_ohci_hcd *exynos_ohci;
111 struct usb_hcd *hcd;
112 struct resource *res;
113 int irq;
114 int err;
115
116
117
118
119
120
121 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
122 if (err)
123 return err;
124
125 hcd = usb_create_hcd(&exynos_ohci_hc_driver,
126 &pdev->dev, dev_name(&pdev->dev));
127 if (!hcd) {
128 dev_err(&pdev->dev, "Unable to create HCD\n");
129 return -ENOMEM;
130 }
131
132 exynos_ohci = to_exynos_ohci(hcd);
133
134 err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
135 if (err)
136 goto fail_clk;
137
138 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
139
140 if (IS_ERR(exynos_ohci->clk)) {
141 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
142 err = PTR_ERR(exynos_ohci->clk);
143 goto fail_clk;
144 }
145
146 err = clk_prepare_enable(exynos_ohci->clk);
147 if (err)
148 goto fail_clk;
149
150 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
151 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
152 if (IS_ERR(hcd->regs)) {
153 err = PTR_ERR(hcd->regs);
154 goto fail_io;
155 }
156 hcd->rsrc_start = res->start;
157 hcd->rsrc_len = resource_size(res);
158
159 irq = platform_get_irq(pdev, 0);
160 if (!irq) {
161 dev_err(&pdev->dev, "Failed to get IRQ\n");
162 err = -ENODEV;
163 goto fail_io;
164 }
165
166 platform_set_drvdata(pdev, hcd);
167
168 err = exynos_ohci_phy_enable(&pdev->dev);
169 if (err) {
170 dev_err(&pdev->dev, "Failed to enable USB phy\n");
171 goto fail_io;
172 }
173
174
175
176
177
178 exynos_ohci->of_node = pdev->dev.of_node;
179 pdev->dev.of_node = NULL;
180
181 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
182 if (err) {
183 dev_err(&pdev->dev, "Failed to add USB HCD\n");
184 goto fail_add_hcd;
185 }
186 device_wakeup_enable(hcd->self.controller);
187 return 0;
188
189fail_add_hcd:
190 exynos_ohci_phy_disable(&pdev->dev);
191 pdev->dev.of_node = exynos_ohci->of_node;
192fail_io:
193 clk_disable_unprepare(exynos_ohci->clk);
194fail_clk:
195 usb_put_hcd(hcd);
196 return err;
197}
198
199static int exynos_ohci_remove(struct platform_device *pdev)
200{
201 struct usb_hcd *hcd = platform_get_drvdata(pdev);
202 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
203
204 pdev->dev.of_node = exynos_ohci->of_node;
205
206 usb_remove_hcd(hcd);
207
208 exynos_ohci_phy_disable(&pdev->dev);
209
210 clk_disable_unprepare(exynos_ohci->clk);
211
212 usb_put_hcd(hcd);
213
214 return 0;
215}
216
217static void exynos_ohci_shutdown(struct platform_device *pdev)
218{
219 struct usb_hcd *hcd = platform_get_drvdata(pdev);
220
221 if (hcd->driver->shutdown)
222 hcd->driver->shutdown(hcd);
223}
224
225#ifdef CONFIG_PM
226static int exynos_ohci_suspend(struct device *dev)
227{
228 struct usb_hcd *hcd = dev_get_drvdata(dev);
229 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
230 bool do_wakeup = device_may_wakeup(dev);
231 int rc = ohci_suspend(hcd, do_wakeup);
232
233 if (rc)
234 return rc;
235
236 exynos_ohci_phy_disable(dev);
237
238 clk_disable_unprepare(exynos_ohci->clk);
239
240 return 0;
241}
242
243static int exynos_ohci_resume(struct device *dev)
244{
245 struct usb_hcd *hcd = dev_get_drvdata(dev);
246 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
247 int ret;
248
249 clk_prepare_enable(exynos_ohci->clk);
250
251 ret = exynos_ohci_phy_enable(dev);
252 if (ret) {
253 dev_err(dev, "Failed to enable USB phy\n");
254 clk_disable_unprepare(exynos_ohci->clk);
255 return ret;
256 }
257
258 ohci_resume(hcd, false);
259
260 return 0;
261}
262#else
263#define exynos_ohci_suspend NULL
264#define exynos_ohci_resume NULL
265#endif
266
267static const struct ohci_driver_overrides exynos_overrides __initconst = {
268 .extra_priv_size = sizeof(struct exynos_ohci_hcd),
269};
270
271static const struct dev_pm_ops exynos_ohci_pm_ops = {
272 .suspend = exynos_ohci_suspend,
273 .resume = exynos_ohci_resume,
274};
275
276#ifdef CONFIG_OF
277static const struct of_device_id exynos_ohci_match[] = {
278 { .compatible = "samsung,exynos4210-ohci" },
279 {},
280};
281MODULE_DEVICE_TABLE(of, exynos_ohci_match);
282#endif
283
284static struct platform_driver exynos_ohci_driver = {
285 .probe = exynos_ohci_probe,
286 .remove = exynos_ohci_remove,
287 .shutdown = exynos_ohci_shutdown,
288 .driver = {
289 .name = "exynos-ohci",
290 .pm = &exynos_ohci_pm_ops,
291 .of_match_table = of_match_ptr(exynos_ohci_match),
292 }
293};
294static int __init ohci_exynos_init(void)
295{
296 if (usb_disabled())
297 return -ENODEV;
298
299 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
300 ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
301 return platform_driver_register(&exynos_ohci_driver);
302}
303module_init(ohci_exynos_init);
304
305static void __exit ohci_exynos_cleanup(void)
306{
307 platform_driver_unregister(&exynos_ohci_driver);
308}
309module_exit(ohci_exynos_cleanup);
310
311MODULE_ALIAS("platform:exynos-ohci");
312MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
313MODULE_LICENSE("GPL v2");
314
