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22#include <linux/clk.h>
23#include <linux/dma-mapping.h>
24#include <linux/err.h>
25#include <linux/kernel.h>
26#include <linux/hrtimer.h>
27#include <linux/io.h>
28#include <linux/module.h>
29#include <linux/of.h>
30#include <linux/phy/phy.h>
31#include <linux/platform_device.h>
32#include <linux/reset.h>
33#include <linux/usb.h>
34#include <linux/usb/hcd.h>
35#include <linux/usb/ehci_pdriver.h>
36
37#include "ehci.h"
38
39#define DRIVER_DESC "EHCI generic platform driver"
40#define EHCI_MAX_CLKS 3
41#define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
42
43struct ehci_platform_priv {
44 struct clk *clks[EHCI_MAX_CLKS];
45 struct reset_control *rst;
46 struct phy **phys;
47 int num_phys;
48 bool reset_on_resume;
49};
50
51static const char hcd_name[] = "ehci-platform";
52
53static int ehci_platform_reset(struct usb_hcd *hcd)
54{
55 struct platform_device *pdev = to_platform_device(hcd->self.controller);
56 struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
57 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
58 int retval;
59
60 ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
61
62 if (pdata->pre_setup) {
63 retval = pdata->pre_setup(hcd);
64 if (retval < 0)
65 return retval;
66 }
67
68 ehci->caps = hcd->regs + pdata->caps_offset;
69 retval = ehci_setup(hcd);
70 if (retval)
71 return retval;
72
73 if (pdata->no_io_watchdog)
74 ehci->need_io_watchdog = 0;
75 return 0;
76}
77
78static int ehci_platform_power_on(struct platform_device *dev)
79{
80 struct usb_hcd *hcd = platform_get_drvdata(dev);
81 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
82 int clk, ret, phy_num;
83
84 for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
85 ret = clk_prepare_enable(priv->clks[clk]);
86 if (ret)
87 goto err_disable_clks;
88 }
89
90 for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
91 ret = phy_init(priv->phys[phy_num]);
92 if (ret)
93 goto err_exit_phy;
94 ret = phy_power_on(priv->phys[phy_num]);
95 if (ret) {
96 phy_exit(priv->phys[phy_num]);
97 goto err_exit_phy;
98 }
99 }
100
101 return 0;
102
103err_exit_phy:
104 while (--phy_num >= 0) {
105 phy_power_off(priv->phys[phy_num]);
106 phy_exit(priv->phys[phy_num]);
107 }
108err_disable_clks:
109 while (--clk >= 0)
110 clk_disable_unprepare(priv->clks[clk]);
111
112 return ret;
113}
114
115static void ehci_platform_power_off(struct platform_device *dev)
116{
117 struct usb_hcd *hcd = platform_get_drvdata(dev);
118 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
119 int clk, phy_num;
120
121 for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
122 phy_power_off(priv->phys[phy_num]);
123 phy_exit(priv->phys[phy_num]);
124 }
125
126 for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
127 if (priv->clks[clk])
128 clk_disable_unprepare(priv->clks[clk]);
129}
130
131static struct hc_driver __read_mostly ehci_platform_hc_driver;
132
133static const struct ehci_driver_overrides platform_overrides __initconst = {
134 .reset = ehci_platform_reset,
135 .extra_priv_size = sizeof(struct ehci_platform_priv),
136};
137
138static struct usb_ehci_pdata ehci_platform_defaults = {
139 .power_on = ehci_platform_power_on,
140 .power_suspend = ehci_platform_power_off,
141 .power_off = ehci_platform_power_off,
142};
143
144static int ehci_platform_probe(struct platform_device *dev)
145{
146 struct usb_hcd *hcd;
147 struct resource *res_mem;
148 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
149 struct ehci_platform_priv *priv;
150 struct ehci_hcd *ehci;
151 int err, irq, phy_num, clk = 0;
152
153 if (usb_disabled())
154 return -ENODEV;
155
156
157
158
159
160 if (!pdata)
161 pdata = &ehci_platform_defaults;
162
163 err = dma_coerce_mask_and_coherent(&dev->dev,
164 pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
165 if (err)
166 return err;
167
168 irq = platform_get_irq(dev, 0);
169 if (irq < 0) {
170 dev_err(&dev->dev, "no irq provided");
171 return irq;
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 if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
185 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
186 ehci->big_endian_mmio = 1;
187
188 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
189 ehci->big_endian_desc = 1;
190
191 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
192 ehci->big_endian_mmio = ehci->big_endian_desc = 1;
193
194 if (of_property_read_bool(dev->dev.of_node,
195 "needs-reset-on-resume"))
196 priv->reset_on_resume = true;
197
198 if (of_property_read_bool(dev->dev.of_node,
199 "has-transaction-translator"))
200 hcd->has_tt = 1;
201
202 priv->num_phys = of_count_phandle_with_args(dev->dev.of_node,
203 "phys", "#phy-cells");
204
205 if (priv->num_phys > 0) {
206 priv->phys = devm_kcalloc(&dev->dev, priv->num_phys,
207 sizeof(struct phy *), GFP_KERNEL);
208 if (!priv->phys)
209 return -ENOMEM;
210 } else
211 priv->num_phys = 0;
212
213 for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
214 priv->phys[phy_num] = devm_of_phy_get_by_index(
215 &dev->dev, dev->dev.of_node, phy_num);
216 if (IS_ERR(priv->phys[phy_num])) {
217 err = PTR_ERR(priv->phys[phy_num]);
218 goto err_put_hcd;
219 }
220 }
221
222 for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
223 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
224 if (IS_ERR(priv->clks[clk])) {
225 err = PTR_ERR(priv->clks[clk]);
226 if (err == -EPROBE_DEFER)
227 goto err_put_clks;
228 priv->clks[clk] = NULL;
229 break;
230 }
231 }
232 }
233
234 priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
235 if (IS_ERR(priv->rst)) {
236 err = PTR_ERR(priv->rst);
237 if (err == -EPROBE_DEFER)
238 goto err_put_clks;
239 priv->rst = NULL;
240 } else {
241 err = reset_control_deassert(priv->rst);
242 if (err)
243 goto err_put_clks;
244 }
245
246 if (pdata->big_endian_desc)
247 ehci->big_endian_desc = 1;
248 if (pdata->big_endian_mmio)
249 ehci->big_endian_mmio = 1;
250 if (pdata->has_tt)
251 hcd->has_tt = 1;
252 if (pdata->reset_on_resume)
253 priv->reset_on_resume = true;
254
255#ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
256 if (ehci->big_endian_mmio) {
257 dev_err(&dev->dev,
258 "Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
259 err = -EINVAL;
260 goto err_reset;
261 }
262#endif
263#ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
264 if (ehci->big_endian_desc) {
265 dev_err(&dev->dev,
266 "Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
267 err = -EINVAL;
268 goto err_reset;
269 }
270#endif
271
272 if (pdata->power_on) {
273 err = pdata->power_on(dev);
274 if (err < 0)
275 goto err_reset;
276 }
277
278 res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
279 hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
280 if (IS_ERR(hcd->regs)) {
281 err = PTR_ERR(hcd->regs);
282 goto err_power;
283 }
284 hcd->rsrc_start = res_mem->start;
285 hcd->rsrc_len = resource_size(res_mem);
286
287 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
288 if (err)
289 goto err_power;
290
291 device_wakeup_enable(hcd->self.controller);
292 platform_set_drvdata(dev, hcd);
293
294 return err;
295
296err_power:
297 if (pdata->power_off)
298 pdata->power_off(dev);
299err_reset:
300 if (priv->rst)
301 reset_control_assert(priv->rst);
302err_put_clks:
303 while (--clk >= 0)
304 clk_put(priv->clks[clk]);
305err_put_hcd:
306 if (pdata == &ehci_platform_defaults)
307 dev->dev.platform_data = NULL;
308
309 usb_put_hcd(hcd);
310
311 return err;
312}
313
314static int ehci_platform_remove(struct platform_device *dev)
315{
316 struct usb_hcd *hcd = platform_get_drvdata(dev);
317 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
318 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
319 int clk;
320
321 usb_remove_hcd(hcd);
322
323 if (pdata->power_off)
324 pdata->power_off(dev);
325
326 if (priv->rst)
327 reset_control_assert(priv->rst);
328
329 for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
330 clk_put(priv->clks[clk]);
331
332 usb_put_hcd(hcd);
333
334 if (pdata == &ehci_platform_defaults)
335 dev->dev.platform_data = NULL;
336
337 return 0;
338}
339
340#ifdef CONFIG_PM_SLEEP
341static int ehci_platform_suspend(struct device *dev)
342{
343 struct usb_hcd *hcd = dev_get_drvdata(dev);
344 struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
345 struct platform_device *pdev =
346 container_of(dev, struct platform_device, dev);
347 bool do_wakeup = device_may_wakeup(dev);
348 int ret;
349
350 ret = ehci_suspend(hcd, do_wakeup);
351 if (ret)
352 return ret;
353
354 if (pdata->power_suspend)
355 pdata->power_suspend(pdev);
356
357 return ret;
358}
359
360static int ehci_platform_resume(struct device *dev)
361{
362 struct usb_hcd *hcd = dev_get_drvdata(dev);
363 struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
364 struct platform_device *pdev =
365 container_of(dev, struct platform_device, dev);
366 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
367
368 if (pdata->power_on) {
369 int err = pdata->power_on(pdev);
370 if (err < 0)
371 return err;
372 }
373
374 ehci_resume(hcd, priv->reset_on_resume);
375 return 0;
376}
377#endif
378
379static const struct of_device_id vt8500_ehci_ids[] = {
380 { .compatible = "via,vt8500-ehci", },
381 { .compatible = "wm,prizm-ehci", },
382 { .compatible = "generic-ehci", },
383 { .compatible = "cavium,octeon-6335-ehci", },
384 {}
385};
386MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
387
388static const struct platform_device_id ehci_platform_table[] = {
389 { "ehci-platform", 0 },
390 { }
391};
392MODULE_DEVICE_TABLE(platform, ehci_platform_table);
393
394static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend,
395 ehci_platform_resume);
396
397static struct platform_driver ehci_platform_driver = {
398 .id_table = ehci_platform_table,
399 .probe = ehci_platform_probe,
400 .remove = ehci_platform_remove,
401 .shutdown = usb_hcd_platform_shutdown,
402 .driver = {
403 .name = "ehci-platform",
404 .pm = &ehci_platform_pm_ops,
405 .of_match_table = vt8500_ehci_ids,
406 }
407};
408
409static int __init ehci_platform_init(void)
410{
411 if (usb_disabled())
412 return -ENODEV;
413
414 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
415
416 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
417 return platform_driver_register(&ehci_platform_driver);
418}
419module_init(ehci_platform_init);
420
421static void __exit ehci_platform_cleanup(void)
422{
423 platform_driver_unregister(&ehci_platform_driver);
424}
425module_exit(ehci_platform_cleanup);
426
427MODULE_DESCRIPTION(DRIVER_DESC);
428MODULE_AUTHOR("Hauke Mehrtens");
429MODULE_AUTHOR("Alan Stern");
430MODULE_LICENSE("GPL");
431
