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15#include <linux/clk.h>
16#include <linux/dma-mapping.h>
17#include <linux/err.h>
18#include <linux/kernel.h>
19#include <linux/hrtimer.h>
20#include <linux/io.h>
21#include <linux/module.h>
22#include <linux/of.h>
23#include <linux/phy/phy.h>
24#include <linux/platform_device.h>
25#include <linux/reset.h>
26#include <linux/usb.h>
27#include <linux/usb/hcd.h>
28#include <linux/usb/ehci_pdriver.h>
29
30#include "ehci.h"
31
32#define USB_MAX_CLKS 3
33
34struct st_ehci_platform_priv {
35 struct clk *clks[USB_MAX_CLKS];
36 struct clk *clk48;
37 struct reset_control *rst;
38 struct reset_control *pwr;
39 struct phy *phy;
40};
41
42#define DRIVER_DESC "EHCI STMicroelectronics driver"
43
44#define hcd_to_ehci_priv(h) \
45 ((struct st_ehci_platform_priv *)hcd_to_ehci(h)->priv)
46
47static const char hcd_name[] = "ehci-st";
48
49#define EHCI_CAPS_SIZE 0x10
50#define AHB2STBUS_INSREG01 (EHCI_CAPS_SIZE + 0x84)
51
52static int st_ehci_platform_reset(struct usb_hcd *hcd)
53{
54 struct platform_device *pdev = to_platform_device(hcd->self.controller);
55 struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
56 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
57 u32 threshold;
58
59
60 threshold = 128 | (128 << 16);
61 writel(threshold, hcd->regs + AHB2STBUS_INSREG01);
62
63 ehci->caps = hcd->regs + pdata->caps_offset;
64 return ehci_setup(hcd);
65}
66
67static int st_ehci_platform_power_on(struct platform_device *dev)
68{
69 struct usb_hcd *hcd = platform_get_drvdata(dev);
70 struct st_ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
71 int clk, ret;
72
73 ret = reset_control_deassert(priv->pwr);
74 if (ret)
75 return ret;
76
77 ret = reset_control_deassert(priv->rst);
78 if (ret)
79 goto err_assert_power;
80
81
82
83 if (priv->clk48) {
84 ret = clk_set_rate(priv->clk48, 48000000);
85 if (ret)
86 goto err_assert_reset;
87 }
88
89 for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) {
90 ret = clk_prepare_enable(priv->clks[clk]);
91 if (ret)
92 goto err_disable_clks;
93 }
94
95 ret = phy_init(priv->phy);
96 if (ret)
97 goto err_disable_clks;
98
99 ret = phy_power_on(priv->phy);
100 if (ret)
101 goto err_exit_phy;
102
103 return 0;
104
105err_exit_phy:
106 phy_exit(priv->phy);
107err_disable_clks:
108 while (--clk >= 0)
109 clk_disable_unprepare(priv->clks[clk]);
110err_assert_reset:
111 reset_control_assert(priv->rst);
112err_assert_power:
113 reset_control_assert(priv->pwr);
114
115 return ret;
116}
117
118static void st_ehci_platform_power_off(struct platform_device *dev)
119{
120 struct usb_hcd *hcd = platform_get_drvdata(dev);
121 struct st_ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
122 int clk;
123
124 reset_control_assert(priv->pwr);
125
126 reset_control_assert(priv->rst);
127
128 phy_power_off(priv->phy);
129
130 phy_exit(priv->phy);
131
132 for (clk = USB_MAX_CLKS - 1; clk >= 0; clk--)
133 if (priv->clks[clk])
134 clk_disable_unprepare(priv->clks[clk]);
135
136}
137
138static struct hc_driver __read_mostly ehci_platform_hc_driver;
139
140static const struct ehci_driver_overrides platform_overrides __initconst = {
141 .reset = st_ehci_platform_reset,
142 .extra_priv_size = sizeof(struct st_ehci_platform_priv),
143};
144
145static struct usb_ehci_pdata ehci_platform_defaults = {
146 .power_on = st_ehci_platform_power_on,
147 .power_suspend = st_ehci_platform_power_off,
148 .power_off = st_ehci_platform_power_off,
149};
150
151static int st_ehci_platform_probe(struct platform_device *dev)
152{
153 struct usb_hcd *hcd;
154 struct resource *res_mem;
155 struct usb_ehci_pdata *pdata = &ehci_platform_defaults;
156 struct st_ehci_platform_priv *priv;
157 struct ehci_hcd *ehci;
158 int err, irq, clk = 0;
159
160 if (usb_disabled())
161 return -ENODEV;
162
163 irq = platform_get_irq(dev, 0);
164 if (irq < 0) {
165 dev_err(&dev->dev, "no irq provided");
166 return irq;
167 }
168 res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
169 if (!res_mem) {
170 dev_err(&dev->dev, "no memory resource provided");
171 return -ENXIO;
172 }
173
174 hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
175 dev_name(&dev->dev));
176 if (!hcd)
177 return -ENOMEM;
178
179 platform_set_drvdata(dev, hcd);
180 dev->dev.platform_data = pdata;
181 priv = hcd_to_ehci_priv(hcd);
182 ehci = hcd_to_ehci(hcd);
183
184 priv->phy = devm_phy_get(&dev->dev, "usb");
185 if (IS_ERR(priv->phy)) {
186 err = PTR_ERR(priv->phy);
187 goto err_put_hcd;
188 }
189
190 for (clk = 0; clk < USB_MAX_CLKS; clk++) {
191 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
192 if (IS_ERR(priv->clks[clk])) {
193 err = PTR_ERR(priv->clks[clk]);
194 if (err == -EPROBE_DEFER)
195 goto err_put_clks;
196 priv->clks[clk] = NULL;
197 break;
198 }
199 }
200
201
202
203 priv->clk48 = devm_clk_get(&dev->dev, "clk48");
204 if (IS_ERR(priv->clk48)) {
205 dev_info(&dev->dev, "48MHz clk not found\n");
206 priv->clk48 = NULL;
207 }
208
209 priv->pwr =
210 devm_reset_control_get_optional_shared(&dev->dev, "power");
211 if (IS_ERR(priv->pwr)) {
212 err = PTR_ERR(priv->pwr);
213 if (err == -EPROBE_DEFER)
214 goto err_put_clks;
215 priv->pwr = NULL;
216 }
217
218 priv->rst =
219 devm_reset_control_get_optional_shared(&dev->dev, "softreset");
220 if (IS_ERR(priv->rst)) {
221 err = PTR_ERR(priv->rst);
222 if (err == -EPROBE_DEFER)
223 goto err_put_clks;
224 priv->rst = NULL;
225 }
226
227 if (pdata->power_on) {
228 err = pdata->power_on(dev);
229 if (err < 0)
230 goto err_put_clks;
231 }
232
233 hcd->rsrc_start = res_mem->start;
234 hcd->rsrc_len = resource_size(res_mem);
235
236 hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
237 if (IS_ERR(hcd->regs)) {
238 err = PTR_ERR(hcd->regs);
239 goto err_put_clks;
240 }
241
242 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
243 if (err)
244 goto err_put_clks;
245
246 device_wakeup_enable(hcd->self.controller);
247 platform_set_drvdata(dev, hcd);
248
249 return err;
250
251err_put_clks:
252 while (--clk >= 0)
253 clk_put(priv->clks[clk]);
254err_put_hcd:
255 if (pdata == &ehci_platform_defaults)
256 dev->dev.platform_data = NULL;
257
258 usb_put_hcd(hcd);
259
260 return err;
261}
262
263static int st_ehci_platform_remove(struct platform_device *dev)
264{
265 struct usb_hcd *hcd = platform_get_drvdata(dev);
266 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
267 struct st_ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
268 int clk;
269
270 usb_remove_hcd(hcd);
271
272 if (pdata->power_off)
273 pdata->power_off(dev);
274
275 for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++)
276 clk_put(priv->clks[clk]);
277
278 usb_put_hcd(hcd);
279
280 if (pdata == &ehci_platform_defaults)
281 dev->dev.platform_data = NULL;
282
283 return 0;
284}
285
286#ifdef CONFIG_PM_SLEEP
287
288static int st_ehci_suspend(struct device *dev)
289{
290 struct usb_hcd *hcd = dev_get_drvdata(dev);
291 struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
292 struct platform_device *pdev = to_platform_device(dev);
293 bool do_wakeup = device_may_wakeup(dev);
294 int ret;
295
296 ret = ehci_suspend(hcd, do_wakeup);
297 if (ret)
298 return ret;
299
300 if (pdata->power_suspend)
301 pdata->power_suspend(pdev);
302
303 pinctrl_pm_select_sleep_state(dev);
304
305 return ret;
306}
307
308static int st_ehci_resume(struct device *dev)
309{
310 struct usb_hcd *hcd = dev_get_drvdata(dev);
311 struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
312 struct platform_device *pdev = to_platform_device(dev);
313 int err;
314
315 pinctrl_pm_select_default_state(dev);
316
317 if (pdata->power_on) {
318 err = pdata->power_on(pdev);
319 if (err < 0)
320 return err;
321 }
322
323 ehci_resume(hcd, false);
324 return 0;
325}
326
327static SIMPLE_DEV_PM_OPS(st_ehci_pm_ops, st_ehci_suspend, st_ehci_resume);
328
329#endif
330
331static const struct of_device_id st_ehci_ids[] = {
332 { .compatible = "st,st-ehci-300x", },
333 { }
334};
335MODULE_DEVICE_TABLE(of, st_ehci_ids);
336
337static struct platform_driver ehci_platform_driver = {
338 .probe = st_ehci_platform_probe,
339 .remove = st_ehci_platform_remove,
340 .shutdown = usb_hcd_platform_shutdown,
341 .driver = {
342 .name = "st-ehci",
343#ifdef CONFIG_PM_SLEEP
344 .pm = &st_ehci_pm_ops,
345#endif
346 .of_match_table = st_ehci_ids,
347 }
348};
349
350static int __init ehci_platform_init(void)
351{
352 if (usb_disabled())
353 return -ENODEV;
354
355 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
356
357 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
358 return platform_driver_register(&ehci_platform_driver);
359}
360module_init(ehci_platform_init);
361
362static void __exit ehci_platform_cleanup(void)
363{
364 platform_driver_unregister(&ehci_platform_driver);
365}
366module_exit(ehci_platform_cleanup);
367
368MODULE_DESCRIPTION(DRIVER_DESC);
369MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
370MODULE_LICENSE("GPL");
371
