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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 of_node_put(child);
81 return ret;
82 } else if (ret != -ENOSYS && ret != -ENODEV) {
83 dev_err(dev,
84 "Error retrieving usb2 phy: %d\n", ret);
85 of_node_put(child);
86 return ret;
87 }
88 }
89 }
90
91 return 0;
92}
93
94static int exynos_ehci_phy_enable(struct device *dev)
95{
96 struct usb_hcd *hcd = dev_get_drvdata(dev);
97 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
98 int i;
99 int ret = 0;
100
101 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
102 if (!IS_ERR(exynos_ehci->phy[i]))
103 ret = phy_power_on(exynos_ehci->phy[i]);
104 if (ret)
105 for (i--; i >= 0; i--)
106 if (!IS_ERR(exynos_ehci->phy[i]))
107 phy_power_off(exynos_ehci->phy[i]);
108
109 return ret;
110}
111
112static void exynos_ehci_phy_disable(struct device *dev)
113{
114 struct usb_hcd *hcd = dev_get_drvdata(dev);
115 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
116 int i;
117
118 for (i = 0; i < PHY_NUMBER; i++)
119 if (!IS_ERR(exynos_ehci->phy[i]))
120 phy_power_off(exynos_ehci->phy[i]);
121}
122
123static void exynos_setup_vbus_gpio(struct device *dev)
124{
125 int err;
126 int gpio;
127
128 if (!dev->of_node)
129 return;
130
131 gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
132 if (!gpio_is_valid(gpio))
133 return;
134
135 err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
136 "ehci_vbus_gpio");
137 if (err)
138 dev_err(dev, "can't request ehci vbus gpio %d", gpio);
139}
140
141static int exynos_ehci_probe(struct platform_device *pdev)
142{
143 struct exynos_ehci_hcd *exynos_ehci;
144 struct usb_hcd *hcd;
145 struct ehci_hcd *ehci;
146 struct resource *res;
147 int irq;
148 int err;
149
150
151
152
153
154
155 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
156 if (err)
157 return err;
158
159 exynos_setup_vbus_gpio(&pdev->dev);
160
161 hcd = usb_create_hcd(&exynos_ehci_hc_driver,
162 &pdev->dev, dev_name(&pdev->dev));
163 if (!hcd) {
164 dev_err(&pdev->dev, "Unable to create HCD\n");
165 return -ENOMEM;
166 }
167 exynos_ehci = to_exynos_ehci(hcd);
168
169 if (of_device_is_compatible(pdev->dev.of_node,
170 "samsung,exynos5440-ehci"))
171 goto skip_phy;
172
173 err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
174 if (err)
175 goto fail_clk;
176
177skip_phy:
178
179 exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
180
181 if (IS_ERR(exynos_ehci->clk)) {
182 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
183 err = PTR_ERR(exynos_ehci->clk);
184 goto fail_clk;
185 }
186
187 err = clk_prepare_enable(exynos_ehci->clk);
188 if (err)
189 goto fail_clk;
190
191 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
192 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
193 if (IS_ERR(hcd->regs)) {
194 err = PTR_ERR(hcd->regs);
195 goto fail_io;
196 }
197
198 hcd->rsrc_start = res->start;
199 hcd->rsrc_len = resource_size(res);
200
201 irq = platform_get_irq(pdev, 0);
202 if (!irq) {
203 dev_err(&pdev->dev, "Failed to get IRQ\n");
204 err = -ENODEV;
205 goto fail_io;
206 }
207
208 err = exynos_ehci_phy_enable(&pdev->dev);
209 if (err) {
210 dev_err(&pdev->dev, "Failed to enable USB phy\n");
211 goto fail_io;
212 }
213
214 ehci = hcd_to_ehci(hcd);
215 ehci->caps = hcd->regs;
216
217
218 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
219
220 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
221 if (err) {
222 dev_err(&pdev->dev, "Failed to add USB HCD\n");
223 goto fail_add_hcd;
224 }
225 device_wakeup_enable(hcd->self.controller);
226
227 platform_set_drvdata(pdev, hcd);
228
229 return 0;
230
231fail_add_hcd:
232 exynos_ehci_phy_disable(&pdev->dev);
233fail_io:
234 clk_disable_unprepare(exynos_ehci->clk);
235fail_clk:
236 usb_put_hcd(hcd);
237 return err;
238}
239
240static int exynos_ehci_remove(struct platform_device *pdev)
241{
242 struct usb_hcd *hcd = platform_get_drvdata(pdev);
243 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
244
245 usb_remove_hcd(hcd);
246
247 exynos_ehci_phy_disable(&pdev->dev);
248
249 clk_disable_unprepare(exynos_ehci->clk);
250
251 usb_put_hcd(hcd);
252
253 return 0;
254}
255
256#ifdef CONFIG_PM
257static int exynos_ehci_suspend(struct device *dev)
258{
259 struct usb_hcd *hcd = dev_get_drvdata(dev);
260 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
261
262 bool do_wakeup = device_may_wakeup(dev);
263 int rc;
264
265 rc = ehci_suspend(hcd, do_wakeup);
266 if (rc)
267 return rc;
268
269 exynos_ehci_phy_disable(dev);
270
271 clk_disable_unprepare(exynos_ehci->clk);
272
273 return rc;
274}
275
276static int exynos_ehci_resume(struct device *dev)
277{
278 struct usb_hcd *hcd = dev_get_drvdata(dev);
279 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
280 int ret;
281
282 ret = clk_prepare_enable(exynos_ehci->clk);
283 if (ret)
284 return ret;
285
286 ret = exynos_ehci_phy_enable(dev);
287 if (ret) {
288 dev_err(dev, "Failed to enable USB phy\n");
289 clk_disable_unprepare(exynos_ehci->clk);
290 return ret;
291 }
292
293
294 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
295
296 ehci_resume(hcd, false);
297 return 0;
298}
299#else
300#define exynos_ehci_suspend NULL
301#define exynos_ehci_resume NULL
302#endif
303
304static const struct dev_pm_ops exynos_ehci_pm_ops = {
305 .suspend = exynos_ehci_suspend,
306 .resume = exynos_ehci_resume,
307};
308
309#ifdef CONFIG_OF
310static const struct of_device_id exynos_ehci_match[] = {
311 { .compatible = "samsung,exynos4210-ehci" },
312 { .compatible = "samsung,exynos5440-ehci" },
313 {},
314};
315MODULE_DEVICE_TABLE(of, exynos_ehci_match);
316#endif
317
318static struct platform_driver exynos_ehci_driver = {
319 .probe = exynos_ehci_probe,
320 .remove = exynos_ehci_remove,
321 .shutdown = usb_hcd_platform_shutdown,
322 .driver = {
323 .name = "exynos-ehci",
324 .pm = &exynos_ehci_pm_ops,
325 .of_match_table = of_match_ptr(exynos_ehci_match),
326 }
327};
328static const struct ehci_driver_overrides exynos_overrides __initconst = {
329 .extra_priv_size = sizeof(struct exynos_ehci_hcd),
330};
331
332static int __init ehci_exynos_init(void)
333{
334 if (usb_disabled())
335 return -ENODEV;
336
337 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
338 ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
339 return platform_driver_register(&exynos_ehci_driver);
340}
341module_init(ehci_exynos_init);
342
343static void __exit ehci_exynos_cleanup(void)
344{
345 platform_driver_unregister(&exynos_ehci_driver);
346}
347module_exit(ehci_exynos_cleanup);
348
349MODULE_DESCRIPTION(DRIVER_DESC);
350MODULE_ALIAS("platform:exynos-ehci");
351MODULE_AUTHOR("Jingoo Han");
352MODULE_AUTHOR("Joonyoung Shim");
353MODULE_LICENSE("GPL v2");
354
