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Linux/drivers/usb/host/ehci-platform.c

  1 /*
  2  * Generic platform ehci driver
  3  *
  4  * Copyright 2007 Steven Brown <sbrown@cortland.com>
  5  * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
  6  * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
  7  *
  8  * Derived from the ohci-ssb driver
  9  * Copyright 2007 Michael Buesch <m@bues.ch>
 10  *
 11  * Derived from the EHCI-PCI driver
 12  * Copyright (c) 2000-2004 by David Brownell
 13  *
 14  * Derived from the ohci-pci driver
 15  * Copyright 1999 Roman Weissgaerber
 16  * Copyright 2000-2002 David Brownell
 17  * Copyright 1999 Linus Torvalds
 18  * Copyright 1999 Gregory P. Smith
 19  *
 20  * Licensed under the GNU/GPL. See COPYING for details.
 21  */
 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 
 43 struct ehci_platform_priv {
 44         struct clk *clks[EHCI_MAX_CLKS];
 45         struct reset_control *rst;
 46         struct phy **phys;
 47         int num_phys;
 48 };
 49 
 50 static const char hcd_name[] = "ehci-platform";
 51 
 52 static int 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         int retval;
 58 
 59         hcd->has_tt = pdata->has_tt;
 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 
 78 static 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                 if (priv->phys[phy_num]) {
 92                         ret = phy_init(priv->phys[phy_num]);
 93                         if (ret)
 94                                 goto err_exit_phy;
 95                         ret = phy_power_on(priv->phys[phy_num]);
 96                         if (ret) {
 97                                 phy_exit(priv->phys[phy_num]);
 98                                 goto err_exit_phy;
 99                         }
100                 }
101         }
102 
103         return 0;
104 
105 err_exit_phy:
106         while (--phy_num >= 0) {
107                 if (priv->phys[phy_num]) {
108                         phy_power_off(priv->phys[phy_num]);
109                         phy_exit(priv->phys[phy_num]);
110                 }
111         }
112 err_disable_clks:
113         while (--clk >= 0)
114                 clk_disable_unprepare(priv->clks[clk]);
115 
116         return ret;
117 }
118 
119 static void ehci_platform_power_off(struct platform_device *dev)
120 {
121         struct usb_hcd *hcd = platform_get_drvdata(dev);
122         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
123         int clk, phy_num;
124 
125         for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
126                 if (priv->phys[phy_num]) {
127                         phy_power_off(priv->phys[phy_num]);
128                         phy_exit(priv->phys[phy_num]);
129                 }
130         }
131 
132         for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
133                 if (priv->clks[clk])
134                         clk_disable_unprepare(priv->clks[clk]);
135 }
136 
137 static struct hc_driver __read_mostly ehci_platform_hc_driver;
138 
139 static const struct ehci_driver_overrides platform_overrides __initconst = {
140         .reset =                ehci_platform_reset,
141         .extra_priv_size =      sizeof(struct ehci_platform_priv),
142 };
143 
144 static struct usb_ehci_pdata ehci_platform_defaults = {
145         .power_on =             ehci_platform_power_on,
146         .power_suspend =        ehci_platform_power_off,
147         .power_off =            ehci_platform_power_off,
148 };
149 
150 static int ehci_platform_probe(struct platform_device *dev)
151 {
152         struct usb_hcd *hcd;
153         struct resource *res_mem;
154         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
155         struct ehci_platform_priv *priv;
156         struct ehci_hcd *ehci;
157         const char *phy_name;
158         int err, irq, phy_num, clk = 0;
159 
160         if (usb_disabled())
161                 return -ENODEV;
162 
163         /*
164          * Use reasonable defaults so platforms don't have to provide these
165          * with DT probing on ARM.
166          */
167         if (!pdata)
168                 pdata = &ehci_platform_defaults;
169 
170         err = dma_coerce_mask_and_coherent(&dev->dev,
171                 pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
172         if (err)
173                 return err;
174 
175         irq = platform_get_irq(dev, 0);
176         if (irq < 0) {
177                 dev_err(&dev->dev, "no irq provided");
178                 return irq;
179         }
180 
181         hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
182                              dev_name(&dev->dev));
183         if (!hcd)
184                 return -ENOMEM;
185 
186         platform_set_drvdata(dev, hcd);
187         dev->dev.platform_data = pdata;
188         priv = hcd_to_ehci_priv(hcd);
189         ehci = hcd_to_ehci(hcd);
190 
191         if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
192                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
193                         ehci->big_endian_mmio = 1;
194 
195                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
196                         ehci->big_endian_desc = 1;
197 
198                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
199                         ehci->big_endian_mmio = ehci->big_endian_desc = 1;
200 
201                 if (of_property_read_bool(dev->dev.of_node,
202                                           "needs-reset-on-resume"))
203                         pdata->reset_on_resume = 1;
204 
205                 priv->num_phys = of_count_phandle_with_args(dev->dev.of_node,
206                                 "phys", "#phy-cells");
207                 priv->num_phys = priv->num_phys > 0 ? priv->num_phys : 1;
208 
209                 priv->phys = devm_kcalloc(&dev->dev, priv->num_phys,
210                                 sizeof(struct phy *), GFP_KERNEL);
211                 if (!priv->phys)
212                         return -ENOMEM;
213 
214                 for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
215                                 err = of_property_read_string_index(
216                                                 dev->dev.of_node,
217                                                 "phy-names", phy_num,
218                                                 &phy_name);
219 
220                                 if (err < 0) {
221                                         if (priv->num_phys > 1) {
222                                                 dev_err(&dev->dev, "phy-names not provided");
223                                                 goto err_put_hcd;
224                                         } else
225                                                 phy_name = "usb";
226                                 }
227 
228                                 priv->phys[phy_num] = devm_phy_get(&dev->dev,
229                                                 phy_name);
230                                 if (IS_ERR(priv->phys[phy_num])) {
231                                         err = PTR_ERR(priv->phys[phy_num]);
232                                         if ((priv->num_phys > 1) ||
233                                             (err == -EPROBE_DEFER))
234                                                 goto err_put_hcd;
235                                         priv->phys[phy_num] = NULL;
236                                 }
237                 }
238 
239                 for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
240                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
241                         if (IS_ERR(priv->clks[clk])) {
242                                 err = PTR_ERR(priv->clks[clk]);
243                                 if (err == -EPROBE_DEFER)
244                                         goto err_put_clks;
245                                 priv->clks[clk] = NULL;
246                                 break;
247                         }
248                 }
249         }
250 
251         priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
252         if (IS_ERR(priv->rst)) {
253                 err = PTR_ERR(priv->rst);
254                 if (err == -EPROBE_DEFER)
255                         goto err_put_clks;
256                 priv->rst = NULL;
257         } else {
258                 err = reset_control_deassert(priv->rst);
259                 if (err)
260                         goto err_put_clks;
261         }
262 
263         if (pdata->big_endian_desc)
264                 ehci->big_endian_desc = 1;
265         if (pdata->big_endian_mmio)
266                 ehci->big_endian_mmio = 1;
267 
268 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
269         if (ehci->big_endian_mmio) {
270                 dev_err(&dev->dev,
271                         "Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
272                 err = -EINVAL;
273                 goto err_reset;
274         }
275 #endif
276 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
277         if (ehci->big_endian_desc) {
278                 dev_err(&dev->dev,
279                         "Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
280                 err = -EINVAL;
281                 goto err_reset;
282         }
283 #endif
284 
285         if (pdata->power_on) {
286                 err = pdata->power_on(dev);
287                 if (err < 0)
288                         goto err_reset;
289         }
290 
291         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
292         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
293         if (IS_ERR(hcd->regs)) {
294                 err = PTR_ERR(hcd->regs);
295                 goto err_power;
296         }
297         hcd->rsrc_start = res_mem->start;
298         hcd->rsrc_len = resource_size(res_mem);
299 
300         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
301         if (err)
302                 goto err_power;
303 
304         device_wakeup_enable(hcd->self.controller);
305         platform_set_drvdata(dev, hcd);
306 
307         return err;
308 
309 err_power:
310         if (pdata->power_off)
311                 pdata->power_off(dev);
312 err_reset:
313         if (priv->rst)
314                 reset_control_assert(priv->rst);
315 err_put_clks:
316         while (--clk >= 0)
317                 clk_put(priv->clks[clk]);
318 err_put_hcd:
319         if (pdata == &ehci_platform_defaults)
320                 dev->dev.platform_data = NULL;
321 
322         usb_put_hcd(hcd);
323 
324         return err;
325 }
326 
327 static int ehci_platform_remove(struct platform_device *dev)
328 {
329         struct usb_hcd *hcd = platform_get_drvdata(dev);
330         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
331         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
332         int clk;
333 
334         usb_remove_hcd(hcd);
335 
336         if (pdata->power_off)
337                 pdata->power_off(dev);
338 
339         if (priv->rst)
340                 reset_control_assert(priv->rst);
341 
342         for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
343                 clk_put(priv->clks[clk]);
344 
345         usb_put_hcd(hcd);
346 
347         if (pdata == &ehci_platform_defaults)
348                 dev->dev.platform_data = NULL;
349 
350         return 0;
351 }
352 
353 #ifdef CONFIG_PM_SLEEP
354 static int ehci_platform_suspend(struct device *dev)
355 {
356         struct usb_hcd *hcd = dev_get_drvdata(dev);
357         struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
358         struct platform_device *pdev =
359                 container_of(dev, struct platform_device, dev);
360         bool do_wakeup = device_may_wakeup(dev);
361         int ret;
362 
363         ret = ehci_suspend(hcd, do_wakeup);
364         if (ret)
365                 return ret;
366 
367         if (pdata->power_suspend)
368                 pdata->power_suspend(pdev);
369 
370         return ret;
371 }
372 
373 static int ehci_platform_resume(struct device *dev)
374 {
375         struct usb_hcd *hcd = dev_get_drvdata(dev);
376         struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
377         struct platform_device *pdev =
378                 container_of(dev, struct platform_device, dev);
379 
380         if (pdata->power_on) {
381                 int err = pdata->power_on(pdev);
382                 if (err < 0)
383                         return err;
384         }
385 
386         ehci_resume(hcd, pdata->reset_on_resume);
387         return 0;
388 }
389 #endif /* CONFIG_PM_SLEEP */
390 
391 static const struct of_device_id vt8500_ehci_ids[] = {
392         { .compatible = "via,vt8500-ehci", },
393         { .compatible = "wm,prizm-ehci", },
394         { .compatible = "generic-ehci", },
395         { .compatible = "cavium,octeon-6335-ehci", },
396         {}
397 };
398 MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
399 
400 static const struct platform_device_id ehci_platform_table[] = {
401         { "ehci-platform", 0 },
402         { }
403 };
404 MODULE_DEVICE_TABLE(platform, ehci_platform_table);
405 
406 static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend,
407         ehci_platform_resume);
408 
409 static struct platform_driver ehci_platform_driver = {
410         .id_table       = ehci_platform_table,
411         .probe          = ehci_platform_probe,
412         .remove         = ehci_platform_remove,
413         .shutdown       = usb_hcd_platform_shutdown,
414         .driver         = {
415                 .name   = "ehci-platform",
416                 .pm     = &ehci_platform_pm_ops,
417                 .of_match_table = vt8500_ehci_ids,
418         }
419 };
420 
421 static int __init ehci_platform_init(void)
422 {
423         if (usb_disabled())
424                 return -ENODEV;
425 
426         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
427 
428         ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
429         return platform_driver_register(&ehci_platform_driver);
430 }
431 module_init(ehci_platform_init);
432 
433 static void __exit ehci_platform_cleanup(void)
434 {
435         platform_driver_unregister(&ehci_platform_driver);
436 }
437 module_exit(ehci_platform_cleanup);
438 
439 MODULE_DESCRIPTION(DRIVER_DESC);
440 MODULE_AUTHOR("Hauke Mehrtens");
441 MODULE_AUTHOR("Alan Stern");
442 MODULE_LICENSE("GPL");
443 

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