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15#include <linux/clk.h>
16#include <linux/dma-mapping.h>
17#include <linux/io.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/of_gpio.h>
22#include <linux/phy/phy.h>
23#include <linux/platform_device.h>
24#include <linux/usb.h>
25#include <linux/usb/hcd.h>
26
27#include "ehci.h"
28
29#define DRIVER_DESC "EHCI EXYNOS driver"
30
31#define EHCI_INSNREG00(base) (base + 0x90)
32#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
33#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
34#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
35#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
36#define EHCI_INSNREG00_ENABLE_DMA_BURST \
37 (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
38 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
39
40static const char hcd_name[] = "ehci-exynos";
41static struct hc_driver __read_mostly exynos_ehci_hc_driver;
42
43#define PHY_NUMBER 3
44
45struct exynos_ehci_hcd {
46 struct clk *clk;
47 struct phy *phy[PHY_NUMBER];
48};
49
50#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
51
52static int exynos_ehci_get_phy(struct device *dev,
53 struct exynos_ehci_hcd *exynos_ehci)
54{
55 struct device_node *child;
56 struct phy *phy;
57 int phy_number;
58 int ret;
59
60
61 for_each_available_child_of_node(dev->of_node, child) {
62 ret = of_property_read_u32(child, "reg", &phy_number);
63 if (ret) {
64 dev_err(dev, "Failed to parse device tree\n");
65 of_node_put(child);
66 return ret;
67 }
68
69 if (phy_number >= PHY_NUMBER) {
70 dev_err(dev, "Invalid number of PHYs\n");
71 of_node_put(child);
72 return -EINVAL;
73 }
74
75 phy = devm_of_phy_get(dev, child, NULL);
76 exynos_ehci->phy[phy_number] = phy;
77 if (IS_ERR(phy)) {
78 ret = PTR_ERR(phy);
79 if (ret == -EPROBE_DEFER) {
80 return ret;
81 } else if (ret != -ENOSYS && ret != -ENODEV) {
82 dev_err(dev,
83 "Error retrieving usb2 phy: %d\n", ret);
84 return ret;
85 }
86 }
87 }
88
89 return 0;
90}
91
92static int exynos_ehci_phy_enable(struct device *dev)
93{
94 struct usb_hcd *hcd = dev_get_drvdata(dev);
95 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
96 int i;
97 int ret = 0;
98
99 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
100 if (!IS_ERR(exynos_ehci->phy[i]))
101 ret = phy_power_on(exynos_ehci->phy[i]);
102 if (ret)
103 for (i--; i >= 0; i--)
104 if (!IS_ERR(exynos_ehci->phy[i]))
105 phy_power_off(exynos_ehci->phy[i]);
106
107 return ret;
108}
109
110static void exynos_ehci_phy_disable(struct device *dev)
111{
112 struct usb_hcd *hcd = dev_get_drvdata(dev);
113 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
114 int i;
115
116 for (i = 0; i < PHY_NUMBER; i++)
117 if (!IS_ERR(exynos_ehci->phy[i]))
118 phy_power_off(exynos_ehci->phy[i]);
119}
120
121static void exynos_setup_vbus_gpio(struct device *dev)
122{
123 int err;
124 int gpio;
125
126 if (!dev->of_node)
127 return;
128
129 gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
130 if (!gpio_is_valid(gpio))
131 return;
132
133 err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
134 "ehci_vbus_gpio");
135 if (err)
136 dev_err(dev, "can't request ehci vbus gpio %d", gpio);
137}
138
139static int exynos_ehci_probe(struct platform_device *pdev)
140{
141 struct exynos_ehci_hcd *exynos_ehci;
142 struct usb_hcd *hcd;
143 struct ehci_hcd *ehci;
144 struct resource *res;
145 int irq;
146 int err;
147
148
149
150
151
152
153 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
154 if (err)
155 return err;
156
157 exynos_setup_vbus_gpio(&pdev->dev);
158
159 hcd = usb_create_hcd(&exynos_ehci_hc_driver,
160 &pdev->dev, dev_name(&pdev->dev));
161 if (!hcd) {
162 dev_err(&pdev->dev, "Unable to create HCD\n");
163 return -ENOMEM;
164 }
165 exynos_ehci = to_exynos_ehci(hcd);
166
167 if (of_device_is_compatible(pdev->dev.of_node,
168 "samsung,exynos5440-ehci"))
169 goto skip_phy;
170
171 err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
172 if (err)
173 goto fail_clk;
174
175skip_phy:
176
177 exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
178
179 if (IS_ERR(exynos_ehci->clk)) {
180 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
181 err = PTR_ERR(exynos_ehci->clk);
182 goto fail_clk;
183 }
184
185 err = clk_prepare_enable(exynos_ehci->clk);
186 if (err)
187 goto fail_clk;
188
189 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
190 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
191 if (IS_ERR(hcd->regs)) {
192 err = PTR_ERR(hcd->regs);
193 goto fail_io;
194 }
195
196 hcd->rsrc_start = res->start;
197 hcd->rsrc_len = resource_size(res);
198
199 irq = platform_get_irq(pdev, 0);
200 if (!irq) {
201 dev_err(&pdev->dev, "Failed to get IRQ\n");
202 err = -ENODEV;
203 goto fail_io;
204 }
205
206 err = exynos_ehci_phy_enable(&pdev->dev);
207 if (err) {
208 dev_err(&pdev->dev, "Failed to enable USB phy\n");
209 goto fail_io;
210 }
211
212 ehci = hcd_to_ehci(hcd);
213 ehci->caps = hcd->regs;
214
215
216 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
217
218 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
219 if (err) {
220 dev_err(&pdev->dev, "Failed to add USB HCD\n");
221 goto fail_add_hcd;
222 }
223 device_wakeup_enable(hcd->self.controller);
224
225 platform_set_drvdata(pdev, hcd);
226
227 return 0;
228
229fail_add_hcd:
230 exynos_ehci_phy_disable(&pdev->dev);
231fail_io:
232 clk_disable_unprepare(exynos_ehci->clk);
233fail_clk:
234 usb_put_hcd(hcd);
235 return err;
236}
237
238static int exynos_ehci_remove(struct platform_device *pdev)
239{
240 struct usb_hcd *hcd = platform_get_drvdata(pdev);
241 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
242
243 usb_remove_hcd(hcd);
244
245 exynos_ehci_phy_disable(&pdev->dev);
246
247 clk_disable_unprepare(exynos_ehci->clk);
248
249 usb_put_hcd(hcd);
250
251 return 0;
252}
253
254#ifdef CONFIG_PM
255static int exynos_ehci_suspend(struct device *dev)
256{
257 struct usb_hcd *hcd = dev_get_drvdata(dev);
258 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
259
260 bool do_wakeup = device_may_wakeup(dev);
261 int rc;
262
263 rc = ehci_suspend(hcd, do_wakeup);
264 if (rc)
265 return rc;
266
267 exynos_ehci_phy_disable(dev);
268
269 clk_disable_unprepare(exynos_ehci->clk);
270
271 return rc;
272}
273
274static int exynos_ehci_resume(struct device *dev)
275{
276 struct usb_hcd *hcd = dev_get_drvdata(dev);
277 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
278 int ret;
279
280 clk_prepare_enable(exynos_ehci->clk);
281
282 ret = exynos_ehci_phy_enable(dev);
283 if (ret) {
284 dev_err(dev, "Failed to enable USB phy\n");
285 clk_disable_unprepare(exynos_ehci->clk);
286 return ret;
287 }
288
289
290 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
291
292 ehci_resume(hcd, false);
293 return 0;
294}
295#else
296#define exynos_ehci_suspend NULL
297#define exynos_ehci_resume NULL
298#endif
299
300static const struct dev_pm_ops exynos_ehci_pm_ops = {
301 .suspend = exynos_ehci_suspend,
302 .resume = exynos_ehci_resume,
303};
304
305#ifdef CONFIG_OF
306static const struct of_device_id exynos_ehci_match[] = {
307 { .compatible = "samsung,exynos4210-ehci" },
308 { .compatible = "samsung,exynos5440-ehci" },
309 {},
310};
311MODULE_DEVICE_TABLE(of, exynos_ehci_match);
312#endif
313
314static struct platform_driver exynos_ehci_driver = {
315 .probe = exynos_ehci_probe,
316 .remove = exynos_ehci_remove,
317 .shutdown = usb_hcd_platform_shutdown,
318 .driver = {
319 .name = "exynos-ehci",
320 .pm = &exynos_ehci_pm_ops,
321 .of_match_table = of_match_ptr(exynos_ehci_match),
322 }
323};
324static const struct ehci_driver_overrides exynos_overrides __initdata = {
325 .extra_priv_size = sizeof(struct exynos_ehci_hcd),
326};
327
328static int __init ehci_exynos_init(void)
329{
330 if (usb_disabled())
331 return -ENODEV;
332
333 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
334 ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
335 return platform_driver_register(&exynos_ehci_driver);
336}
337module_init(ehci_exynos_init);
338
339static void __exit ehci_exynos_cleanup(void)
340{
341 platform_driver_unregister(&exynos_ehci_driver);
342}
343module_exit(ehci_exynos_cleanup);
344
345MODULE_DESCRIPTION(DRIVER_DESC);
346MODULE_ALIAS("platform:exynos-ehci");
347MODULE_AUTHOR("Jingoo Han");
348MODULE_AUTHOR("Joonyoung Shim");
349MODULE_LICENSE("GPL v2");
350
