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14#include <linux/clk.h>
15#include <linux/dma-mapping.h>
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21#include <linux/phy/phy.h>
22#include <linux/usb.h>
23#include <linux/usb/hcd.h>
24
25#include "ohci.h"
26
27#define DRIVER_DESC "OHCI EXYNOS driver"
28
29static const char hcd_name[] = "ohci-exynos";
30static struct hc_driver __read_mostly exynos_ohci_hc_driver;
31
32#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
33
34#define PHY_NUMBER 3
35
36struct exynos_ohci_hcd {
37 struct clk *clk;
38 struct phy *phy[PHY_NUMBER];
39};
40
41static int exynos_ohci_get_phy(struct device *dev,
42 struct exynos_ohci_hcd *exynos_ohci)
43{
44 struct device_node *child;
45 struct phy *phy;
46 int phy_number;
47 int ret;
48
49
50 for_each_available_child_of_node(dev->of_node, child) {
51 ret = of_property_read_u32(child, "reg", &phy_number);
52 if (ret) {
53 dev_err(dev, "Failed to parse device tree\n");
54 of_node_put(child);
55 return ret;
56 }
57
58 if (phy_number >= PHY_NUMBER) {
59 dev_err(dev, "Invalid number of PHYs\n");
60 of_node_put(child);
61 return -EINVAL;
62 }
63
64 phy = devm_of_phy_get(dev, child, NULL);
65 exynos_ohci->phy[phy_number] = phy;
66 if (IS_ERR(phy)) {
67 ret = PTR_ERR(phy);
68 if (ret == -EPROBE_DEFER) {
69 of_node_put(child);
70 return ret;
71 } else if (ret != -ENOSYS && ret != -ENODEV) {
72 dev_err(dev,
73 "Error retrieving usb2 phy: %d\n", ret);
74 of_node_put(child);
75 return ret;
76 }
77 }
78 }
79
80 return 0;
81}
82
83static int exynos_ohci_phy_enable(struct device *dev)
84{
85 struct usb_hcd *hcd = dev_get_drvdata(dev);
86 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
87 int i;
88 int ret = 0;
89
90 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
91 if (!IS_ERR(exynos_ohci->phy[i]))
92 ret = phy_power_on(exynos_ohci->phy[i]);
93 if (ret)
94 for (i--; i >= 0; i--)
95 if (!IS_ERR(exynos_ohci->phy[i]))
96 phy_power_off(exynos_ohci->phy[i]);
97
98 return ret;
99}
100
101static void exynos_ohci_phy_disable(struct device *dev)
102{
103 struct usb_hcd *hcd = dev_get_drvdata(dev);
104 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
105 int i;
106
107 for (i = 0; i < PHY_NUMBER; i++)
108 if (!IS_ERR(exynos_ohci->phy[i]))
109 phy_power_off(exynos_ohci->phy[i]);
110}
111
112static int exynos_ohci_probe(struct platform_device *pdev)
113{
114 struct exynos_ohci_hcd *exynos_ohci;
115 struct usb_hcd *hcd;
116 struct resource *res;
117 int irq;
118 int err;
119
120
121
122
123
124
125 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
126 if (err)
127 return err;
128
129 hcd = usb_create_hcd(&exynos_ohci_hc_driver,
130 &pdev->dev, dev_name(&pdev->dev));
131 if (!hcd) {
132 dev_err(&pdev->dev, "Unable to create HCD\n");
133 return -ENOMEM;
134 }
135
136 exynos_ohci = to_exynos_ohci(hcd);
137
138 if (of_device_is_compatible(pdev->dev.of_node,
139 "samsung,exynos5440-ohci"))
140 goto skip_phy;
141
142 err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
143 if (err)
144 goto fail_clk;
145
146skip_phy:
147 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
148
149 if (IS_ERR(exynos_ohci->clk)) {
150 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
151 err = PTR_ERR(exynos_ohci->clk);
152 goto fail_clk;
153 }
154
155 err = clk_prepare_enable(exynos_ohci->clk);
156 if (err)
157 goto fail_clk;
158
159 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
160 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
161 if (IS_ERR(hcd->regs)) {
162 err = PTR_ERR(hcd->regs);
163 goto fail_io;
164 }
165 hcd->rsrc_start = res->start;
166 hcd->rsrc_len = resource_size(res);
167
168 irq = platform_get_irq(pdev, 0);
169 if (!irq) {
170 dev_err(&pdev->dev, "Failed to get IRQ\n");
171 err = -ENODEV;
172 goto fail_io;
173 }
174
175 platform_set_drvdata(pdev, hcd);
176
177 err = exynos_ohci_phy_enable(&pdev->dev);
178 if (err) {
179 dev_err(&pdev->dev, "Failed to enable USB phy\n");
180 goto fail_io;
181 }
182
183 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
184 if (err) {
185 dev_err(&pdev->dev, "Failed to add USB HCD\n");
186 goto fail_add_hcd;
187 }
188 device_wakeup_enable(hcd->self.controller);
189 return 0;
190
191fail_add_hcd:
192 exynos_ohci_phy_disable(&pdev->dev);
193fail_io:
194 clk_disable_unprepare(exynos_ohci->clk);
195fail_clk:
196 usb_put_hcd(hcd);
197 return err;
198}
199
200static int exynos_ohci_remove(struct platform_device *pdev)
201{
202 struct usb_hcd *hcd = platform_get_drvdata(pdev);
203 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
204
205 usb_remove_hcd(hcd);
206
207 exynos_ohci_phy_disable(&pdev->dev);
208
209 clk_disable_unprepare(exynos_ohci->clk);
210
211 usb_put_hcd(hcd);
212
213 return 0;
214}
215
216static void exynos_ohci_shutdown(struct platform_device *pdev)
217{
218 struct usb_hcd *hcd = platform_get_drvdata(pdev);
219
220 if (hcd->driver->shutdown)
221 hcd->driver->shutdown(hcd);
222}
223
224#ifdef CONFIG_PM
225static int exynos_ohci_suspend(struct device *dev)
226{
227 struct usb_hcd *hcd = dev_get_drvdata(dev);
228 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
229 bool do_wakeup = device_may_wakeup(dev);
230 int rc = ohci_suspend(hcd, do_wakeup);
231
232 if (rc)
233 return rc;
234
235 exynos_ohci_phy_disable(dev);
236
237 clk_disable_unprepare(exynos_ohci->clk);
238
239 return 0;
240}
241
242static int exynos_ohci_resume(struct device *dev)
243{
244 struct usb_hcd *hcd = dev_get_drvdata(dev);
245 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
246 int ret;
247
248 clk_prepare_enable(exynos_ohci->clk);
249
250 ret = exynos_ohci_phy_enable(dev);
251 if (ret) {
252 dev_err(dev, "Failed to enable USB phy\n");
253 clk_disable_unprepare(exynos_ohci->clk);
254 return ret;
255 }
256
257 ohci_resume(hcd, false);
258
259 return 0;
260}
261#else
262#define exynos_ohci_suspend NULL
263#define exynos_ohci_resume NULL
264#endif
265
266static const struct ohci_driver_overrides exynos_overrides __initconst = {
267 .extra_priv_size = sizeof(struct exynos_ohci_hcd),
268};
269
270static const struct dev_pm_ops exynos_ohci_pm_ops = {
271 .suspend = exynos_ohci_suspend,
272 .resume = exynos_ohci_resume,
273};
274
275#ifdef CONFIG_OF
276static const struct of_device_id exynos_ohci_match[] = {
277 { .compatible = "samsung,exynos4210-ohci" },
278 { .compatible = "samsung,exynos5440-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
