This source file includes following definitions.
- ehci_platform_reset
- ehci_platform_power_on
- ehci_platform_power_off
- ehci_platform_probe
- ehci_platform_remove
- ehci_platform_suspend
- ehci_platform_resume
- ehci_platform_init
- ehci_platform_cleanup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21 #include <linux/acpi.h>
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/platform_device.h>
31 #include <linux/reset.h>
32 #include <linux/usb.h>
33 #include <linux/usb/hcd.h>
34 #include <linux/usb/ehci_pdriver.h>
35 #include <linux/usb/of.h>
36
37 #include "ehci.h"
38
39 #define DRIVER_DESC "EHCI generic platform driver"
40 #define EHCI_MAX_CLKS 4
41 #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
42
43 struct ehci_platform_priv {
44 struct clk *clks[EHCI_MAX_CLKS];
45 struct reset_control *rsts;
46 bool reset_on_resume;
47 };
48
49 static const char hcd_name[] = "ehci-platform";
50
51 static int ehci_platform_reset(struct usb_hcd *hcd)
52 {
53 struct platform_device *pdev = to_platform_device(hcd->self.controller);
54 struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
55 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
56 int retval;
57
58 ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
59
60 if (pdata->pre_setup) {
61 retval = pdata->pre_setup(hcd);
62 if (retval < 0)
63 return retval;
64 }
65
66 ehci->caps = hcd->regs + pdata->caps_offset;
67 retval = ehci_setup(hcd);
68 if (retval)
69 return retval;
70
71 if (pdata->no_io_watchdog)
72 ehci->need_io_watchdog = 0;
73 return 0;
74 }
75
76 static int ehci_platform_power_on(struct platform_device *dev)
77 {
78 struct usb_hcd *hcd = platform_get_drvdata(dev);
79 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
80 int clk, ret;
81
82 for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
83 ret = clk_prepare_enable(priv->clks[clk]);
84 if (ret)
85 goto err_disable_clks;
86 }
87
88 return 0;
89
90 err_disable_clks:
91 while (--clk >= 0)
92 clk_disable_unprepare(priv->clks[clk]);
93
94 return ret;
95 }
96
97 static void ehci_platform_power_off(struct platform_device *dev)
98 {
99 struct usb_hcd *hcd = platform_get_drvdata(dev);
100 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
101 int clk;
102
103 for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
104 if (priv->clks[clk])
105 clk_disable_unprepare(priv->clks[clk]);
106 }
107
108 static struct hc_driver __read_mostly ehci_platform_hc_driver;
109
110 static const struct ehci_driver_overrides platform_overrides __initconst = {
111 .reset = ehci_platform_reset,
112 .extra_priv_size = sizeof(struct ehci_platform_priv),
113 };
114
115 static struct usb_ehci_pdata ehci_platform_defaults = {
116 .power_on = ehci_platform_power_on,
117 .power_suspend = ehci_platform_power_off,
118 .power_off = ehci_platform_power_off,
119 };
120
121 static int ehci_platform_probe(struct platform_device *dev)
122 {
123 struct usb_hcd *hcd;
124 struct resource *res_mem;
125 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
126 struct ehci_platform_priv *priv;
127 struct ehci_hcd *ehci;
128 int err, irq, clk = 0;
129
130 if (usb_disabled())
131 return -ENODEV;
132
133
134
135
136
137 if (!pdata)
138 pdata = &ehci_platform_defaults;
139
140 err = dma_coerce_mask_and_coherent(&dev->dev,
141 pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
142 if (err) {
143 dev_err(&dev->dev, "Error: DMA mask configuration failed\n");
144 return err;
145 }
146
147 irq = platform_get_irq(dev, 0);
148 if (irq < 0)
149 return irq;
150
151 hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
152 dev_name(&dev->dev));
153 if (!hcd)
154 return -ENOMEM;
155
156 platform_set_drvdata(dev, hcd);
157 dev->dev.platform_data = pdata;
158 priv = hcd_to_ehci_priv(hcd);
159 ehci = hcd_to_ehci(hcd);
160
161 if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
162 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
163 ehci->big_endian_mmio = 1;
164
165 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
166 ehci->big_endian_desc = 1;
167
168 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
169 ehci->big_endian_mmio = ehci->big_endian_desc = 1;
170
171 if (of_property_read_bool(dev->dev.of_node,
172 "needs-reset-on-resume"))
173 priv->reset_on_resume = true;
174
175 if (of_property_read_bool(dev->dev.of_node,
176 "has-transaction-translator"))
177 hcd->has_tt = 1;
178
179 for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
180 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
181 if (IS_ERR(priv->clks[clk])) {
182 err = PTR_ERR(priv->clks[clk]);
183 if (err == -EPROBE_DEFER)
184 goto err_put_clks;
185 priv->clks[clk] = NULL;
186 break;
187 }
188 }
189 }
190
191 priv->rsts = devm_reset_control_array_get_optional_shared(&dev->dev);
192 if (IS_ERR(priv->rsts)) {
193 err = PTR_ERR(priv->rsts);
194 goto err_put_clks;
195 }
196
197 err = reset_control_deassert(priv->rsts);
198 if (err)
199 goto err_put_clks;
200
201 if (pdata->big_endian_desc)
202 ehci->big_endian_desc = 1;
203 if (pdata->big_endian_mmio)
204 ehci->big_endian_mmio = 1;
205 if (pdata->has_tt)
206 hcd->has_tt = 1;
207 if (pdata->reset_on_resume)
208 priv->reset_on_resume = true;
209
210 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
211 if (ehci->big_endian_mmio) {
212 dev_err(&dev->dev,
213 "Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
214 err = -EINVAL;
215 goto err_reset;
216 }
217 #endif
218 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
219 if (ehci->big_endian_desc) {
220 dev_err(&dev->dev,
221 "Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
222 err = -EINVAL;
223 goto err_reset;
224 }
225 #endif
226
227 if (pdata->power_on) {
228 err = pdata->power_on(dev);
229 if (err < 0)
230 goto err_reset;
231 }
232
233 res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
234 hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
235 if (IS_ERR(hcd->regs)) {
236 err = PTR_ERR(hcd->regs);
237 goto err_power;
238 }
239 hcd->rsrc_start = res_mem->start;
240 hcd->rsrc_len = resource_size(res_mem);
241
242 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
243 if (err)
244 goto err_power;
245
246 device_wakeup_enable(hcd->self.controller);
247 device_enable_async_suspend(hcd->self.controller);
248 platform_set_drvdata(dev, hcd);
249
250 return err;
251
252 err_power:
253 if (pdata->power_off)
254 pdata->power_off(dev);
255 err_reset:
256 reset_control_assert(priv->rsts);
257 err_put_clks:
258 while (--clk >= 0)
259 clk_put(priv->clks[clk]);
260
261 if (pdata == &ehci_platform_defaults)
262 dev->dev.platform_data = NULL;
263
264 usb_put_hcd(hcd);
265
266 return err;
267 }
268
269 static int ehci_platform_remove(struct platform_device *dev)
270 {
271 struct usb_hcd *hcd = platform_get_drvdata(dev);
272 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
273 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
274 int clk;
275
276 usb_remove_hcd(hcd);
277
278 if (pdata->power_off)
279 pdata->power_off(dev);
280
281 reset_control_assert(priv->rsts);
282
283 for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
284 clk_put(priv->clks[clk]);
285
286 usb_put_hcd(hcd);
287
288 if (pdata == &ehci_platform_defaults)
289 dev->dev.platform_data = NULL;
290
291 return 0;
292 }
293
294 #ifdef CONFIG_PM_SLEEP
295 static int ehci_platform_suspend(struct device *dev)
296 {
297 struct usb_hcd *hcd = dev_get_drvdata(dev);
298 struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
299 struct platform_device *pdev = to_platform_device(dev);
300 bool do_wakeup = device_may_wakeup(dev);
301 int ret;
302
303 ret = ehci_suspend(hcd, do_wakeup);
304 if (ret)
305 return ret;
306
307 if (pdata->power_suspend)
308 pdata->power_suspend(pdev);
309
310 return ret;
311 }
312
313 static int ehci_platform_resume(struct device *dev)
314 {
315 struct usb_hcd *hcd = dev_get_drvdata(dev);
316 struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
317 struct platform_device *pdev = to_platform_device(dev);
318 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
319 struct device *companion_dev;
320
321 if (pdata->power_on) {
322 int err = pdata->power_on(pdev);
323 if (err < 0)
324 return err;
325 }
326
327 companion_dev = usb_of_get_companion_dev(hcd->self.controller);
328 if (companion_dev) {
329 device_pm_wait_for_dev(hcd->self.controller, companion_dev);
330 put_device(companion_dev);
331 }
332
333 ehci_resume(hcd, priv->reset_on_resume);
334 return 0;
335 }
336 #endif
337
338 static const struct of_device_id vt8500_ehci_ids[] = {
339 { .compatible = "via,vt8500-ehci", },
340 { .compatible = "wm,prizm-ehci", },
341 { .compatible = "generic-ehci", },
342 { .compatible = "cavium,octeon-6335-ehci", },
343 {}
344 };
345 MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
346
347 static const struct acpi_device_id ehci_acpi_match[] = {
348 { "PNP0D20", 0 },
349 { }
350 };
351 MODULE_DEVICE_TABLE(acpi, ehci_acpi_match);
352
353 static const struct platform_device_id ehci_platform_table[] = {
354 { "ehci-platform", 0 },
355 { }
356 };
357 MODULE_DEVICE_TABLE(platform, ehci_platform_table);
358
359 static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend,
360 ehci_platform_resume);
361
362 static struct platform_driver ehci_platform_driver = {
363 .id_table = ehci_platform_table,
364 .probe = ehci_platform_probe,
365 .remove = ehci_platform_remove,
366 .shutdown = usb_hcd_platform_shutdown,
367 .driver = {
368 .name = "ehci-platform",
369 .pm = &ehci_platform_pm_ops,
370 .of_match_table = vt8500_ehci_ids,
371 .acpi_match_table = ACPI_PTR(ehci_acpi_match),
372 }
373 };
374
375 static int __init ehci_platform_init(void)
376 {
377 if (usb_disabled())
378 return -ENODEV;
379
380 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
381
382 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
383 return platform_driver_register(&ehci_platform_driver);
384 }
385 module_init(ehci_platform_init);
386
387 static void __exit ehci_platform_cleanup(void)
388 {
389 platform_driver_unregister(&ehci_platform_driver);
390 }
391 module_exit(ehci_platform_cleanup);
392
393 MODULE_DESCRIPTION(DRIVER_DESC);
394 MODULE_AUTHOR("Hauke Mehrtens");
395 MODULE_AUTHOR("Alan Stern");
396 MODULE_LICENSE("GPL");