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10#include <linux/clk.h>
11#include <linux/dma-mapping.h>
12#include <linux/io.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/of_gpio.h>
17#include <linux/phy/phy.h>
18#include <linux/platform_device.h>
19#include <linux/usb.h>
20#include <linux/usb/hcd.h>
21
22#include "ehci.h"
23
24#define DRIVER_DESC "EHCI Exynos driver"
25
26#define EHCI_INSNREG00(base) (base + 0x90)
27#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
28#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
29#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
30#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
31#define EHCI_INSNREG00_ENABLE_DMA_BURST \
32 (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
33 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
34
35static const char hcd_name[] = "ehci-exynos";
36static struct hc_driver __read_mostly exynos_ehci_hc_driver;
37
38#define PHY_NUMBER 3
39
40struct exynos_ehci_hcd {
41 struct clk *clk;
42 struct device_node *of_node;
43 struct phy *phy[PHY_NUMBER];
44 bool legacy_phy;
45};
46
47#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
48
49static int exynos_ehci_get_phy(struct device *dev,
50 struct exynos_ehci_hcd *exynos_ehci)
51{
52 struct device_node *child;
53 struct phy *phy;
54 int phy_number, num_phys;
55 int ret;
56
57
58 num_phys = of_count_phandle_with_args(dev->of_node, "phys",
59 "#phy-cells");
60 for (phy_number = 0; phy_number < num_phys; phy_number++) {
61 phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number);
62 if (IS_ERR(phy))
63 return PTR_ERR(phy);
64 exynos_ehci->phy[phy_number] = phy;
65 }
66 if (num_phys > 0)
67 return 0;
68
69
70 for_each_available_child_of_node(dev->of_node, child) {
71 ret = of_property_read_u32(child, "reg", &phy_number);
72 if (ret) {
73 dev_err(dev, "Failed to parse device tree\n");
74 of_node_put(child);
75 return ret;
76 }
77
78 if (phy_number >= PHY_NUMBER) {
79 dev_err(dev, "Invalid number of PHYs\n");
80 of_node_put(child);
81 return -EINVAL;
82 }
83
84 phy = devm_of_phy_get(dev, child, NULL);
85 exynos_ehci->phy[phy_number] = phy;
86 if (IS_ERR(phy)) {
87 ret = PTR_ERR(phy);
88 if (ret == -EPROBE_DEFER) {
89 of_node_put(child);
90 return ret;
91 } else if (ret != -ENOSYS && ret != -ENODEV) {
92 dev_err(dev,
93 "Error retrieving usb2 phy: %d\n", ret);
94 of_node_put(child);
95 return ret;
96 }
97 }
98 }
99
100 exynos_ehci->legacy_phy = true;
101 return 0;
102}
103
104static int exynos_ehci_phy_enable(struct device *dev)
105{
106 struct usb_hcd *hcd = dev_get_drvdata(dev);
107 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
108 int i;
109 int ret = 0;
110
111 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
112 if (!IS_ERR(exynos_ehci->phy[i]))
113 ret = phy_power_on(exynos_ehci->phy[i]);
114 if (ret)
115 for (i--; i >= 0; i--)
116 if (!IS_ERR(exynos_ehci->phy[i]))
117 phy_power_off(exynos_ehci->phy[i]);
118
119 return ret;
120}
121
122static void exynos_ehci_phy_disable(struct device *dev)
123{
124 struct usb_hcd *hcd = dev_get_drvdata(dev);
125 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
126 int i;
127
128 for (i = 0; i < PHY_NUMBER; i++)
129 if (!IS_ERR(exynos_ehci->phy[i]))
130 phy_power_off(exynos_ehci->phy[i]);
131}
132
133static void exynos_setup_vbus_gpio(struct device *dev)
134{
135 int err;
136 int gpio;
137
138 if (!dev->of_node)
139 return;
140
141 gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
142 if (!gpio_is_valid(gpio))
143 return;
144
145 err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
146 "ehci_vbus_gpio");
147 if (err)
148 dev_err(dev, "can't request ehci vbus gpio %d", gpio);
149}
150
151static int exynos_ehci_probe(struct platform_device *pdev)
152{
153 struct exynos_ehci_hcd *exynos_ehci;
154 struct usb_hcd *hcd;
155 struct ehci_hcd *ehci;
156 struct resource *res;
157 int irq;
158 int err;
159
160
161
162
163
164
165 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
166 if (err)
167 return err;
168
169 exynos_setup_vbus_gpio(&pdev->dev);
170
171 hcd = usb_create_hcd(&exynos_ehci_hc_driver,
172 &pdev->dev, dev_name(&pdev->dev));
173 if (!hcd) {
174 dev_err(&pdev->dev, "Unable to create HCD\n");
175 return -ENOMEM;
176 }
177 exynos_ehci = to_exynos_ehci(hcd);
178
179 err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
180 if (err)
181 goto fail_clk;
182
183 exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
184
185 if (IS_ERR(exynos_ehci->clk)) {
186 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
187 err = PTR_ERR(exynos_ehci->clk);
188 goto fail_clk;
189 }
190
191 err = clk_prepare_enable(exynos_ehci->clk);
192 if (err)
193 goto fail_clk;
194
195 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
196 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
197 if (IS_ERR(hcd->regs)) {
198 err = PTR_ERR(hcd->regs);
199 goto fail_io;
200 }
201
202 hcd->rsrc_start = res->start;
203 hcd->rsrc_len = resource_size(res);
204
205 irq = platform_get_irq(pdev, 0);
206 if (irq < 0) {
207 err = irq;
208 goto fail_io;
209 }
210
211 err = exynos_ehci_phy_enable(&pdev->dev);
212 if (err) {
213 dev_err(&pdev->dev, "Failed to enable USB phy\n");
214 goto fail_io;
215 }
216
217 ehci = hcd_to_ehci(hcd);
218 ehci->caps = hcd->regs;
219
220
221
222
223
224 exynos_ehci->of_node = pdev->dev.of_node;
225 if (exynos_ehci->legacy_phy)
226 pdev->dev.of_node = NULL;
227
228
229 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
230
231 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
232 if (err) {
233 dev_err(&pdev->dev, "Failed to add USB HCD\n");
234 goto fail_add_hcd;
235 }
236 device_wakeup_enable(hcd->self.controller);
237
238 platform_set_drvdata(pdev, hcd);
239
240 return 0;
241
242fail_add_hcd:
243 exynos_ehci_phy_disable(&pdev->dev);
244 pdev->dev.of_node = exynos_ehci->of_node;
245fail_io:
246 clk_disable_unprepare(exynos_ehci->clk);
247fail_clk:
248 usb_put_hcd(hcd);
249 return err;
250}
251
252static int exynos_ehci_remove(struct platform_device *pdev)
253{
254 struct usb_hcd *hcd = platform_get_drvdata(pdev);
255 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
256
257 pdev->dev.of_node = exynos_ehci->of_node;
258
259 usb_remove_hcd(hcd);
260
261 exynos_ehci_phy_disable(&pdev->dev);
262
263 clk_disable_unprepare(exynos_ehci->clk);
264
265 usb_put_hcd(hcd);
266
267 return 0;
268}
269
270#ifdef CONFIG_PM
271static int exynos_ehci_suspend(struct device *dev)
272{
273 struct usb_hcd *hcd = dev_get_drvdata(dev);
274 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
275
276 bool do_wakeup = device_may_wakeup(dev);
277 int rc;
278
279 rc = ehci_suspend(hcd, do_wakeup);
280 if (rc)
281 return rc;
282
283 exynos_ehci_phy_disable(dev);
284
285 clk_disable_unprepare(exynos_ehci->clk);
286
287 return rc;
288}
289
290static int exynos_ehci_resume(struct device *dev)
291{
292 struct usb_hcd *hcd = dev_get_drvdata(dev);
293 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
294 int ret;
295
296 ret = clk_prepare_enable(exynos_ehci->clk);
297 if (ret)
298 return ret;
299
300 ret = exynos_ehci_phy_enable(dev);
301 if (ret) {
302 dev_err(dev, "Failed to enable USB phy\n");
303 clk_disable_unprepare(exynos_ehci->clk);
304 return ret;
305 }
306
307
308 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
309
310 ehci_resume(hcd, false);
311 return 0;
312}
313#else
314#define exynos_ehci_suspend NULL
315#define exynos_ehci_resume NULL
316#endif
317
318static const struct dev_pm_ops exynos_ehci_pm_ops = {
319 .suspend = exynos_ehci_suspend,
320 .resume = exynos_ehci_resume,
321};
322
323#ifdef CONFIG_OF
324static const struct of_device_id exynos_ehci_match[] = {
325 { .compatible = "samsung,exynos4210-ehci" },
326 {},
327};
328MODULE_DEVICE_TABLE(of, exynos_ehci_match);
329#endif
330
331static struct platform_driver exynos_ehci_driver = {
332 .probe = exynos_ehci_probe,
333 .remove = exynos_ehci_remove,
334 .shutdown = usb_hcd_platform_shutdown,
335 .driver = {
336 .name = "exynos-ehci",
337 .pm = &exynos_ehci_pm_ops,
338 .of_match_table = of_match_ptr(exynos_ehci_match),
339 }
340};
341static const struct ehci_driver_overrides exynos_overrides __initconst = {
342 .extra_priv_size = sizeof(struct exynos_ehci_hcd),
343};
344
345static int __init ehci_exynos_init(void)
346{
347 if (usb_disabled())
348 return -ENODEV;
349
350 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
351 ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
352 return platform_driver_register(&exynos_ehci_driver);
353}
354module_init(ehci_exynos_init);
355
356static void __exit ehci_exynos_cleanup(void)
357{
358 platform_driver_unregister(&exynos_ehci_driver);
359}
360module_exit(ehci_exynos_cleanup);
361
362MODULE_DESCRIPTION(DRIVER_DESC);
363MODULE_ALIAS("platform:exynos-ehci");
364MODULE_AUTHOR("Jingoo Han");
365MODULE_AUTHOR("Joonyoung Shim");
366MODULE_LICENSE("GPL v2");
367
