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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 *phy;
 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         hcd->has_tt = pdata->has_tt;
 59         ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
 60 
 61         if (pdata->pre_setup) {
 62                 retval = pdata->pre_setup(hcd);
 63                 if (retval < 0)
 64                         return retval;
 65         }
 66 
 67         ehci->caps = hcd->regs + pdata->caps_offset;
 68         retval = ehci_setup(hcd);
 69         if (retval)
 70                 return retval;
 71 
 72         if (pdata->no_io_watchdog)
 73                 ehci->need_io_watchdog = 0;
 74         return 0;
 75 }
 76 
 77 static int ehci_platform_power_on(struct platform_device *dev)
 78 {
 79         struct usb_hcd *hcd = platform_get_drvdata(dev);
 80         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 81         int clk, ret;
 82 
 83         for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
 84                 ret = clk_prepare_enable(priv->clks[clk]);
 85                 if (ret)
 86                         goto err_disable_clks;
 87         }
 88 
 89         if (priv->phy) {
 90                 ret = phy_init(priv->phy);
 91                 if (ret)
 92                         goto err_disable_clks;
 93 
 94                 ret = phy_power_on(priv->phy);
 95                 if (ret)
 96                         goto err_exit_phy;
 97         }
 98 
 99         return 0;
100 
101 err_exit_phy:
102         phy_exit(priv->phy);
103 err_disable_clks:
104         while (--clk >= 0)
105                 clk_disable_unprepare(priv->clks[clk]);
106 
107         return ret;
108 }
109 
110 static void ehci_platform_power_off(struct platform_device *dev)
111 {
112         struct usb_hcd *hcd = platform_get_drvdata(dev);
113         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
114         int clk;
115 
116         if (priv->phy) {
117                 phy_power_off(priv->phy);
118                 phy_exit(priv->phy);
119         }
120 
121         for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
122                 if (priv->clks[clk])
123                         clk_disable_unprepare(priv->clks[clk]);
124 }
125 
126 static struct hc_driver __read_mostly ehci_platform_hc_driver;
127 
128 static const struct ehci_driver_overrides platform_overrides __initconst = {
129         .reset =                ehci_platform_reset,
130         .extra_priv_size =      sizeof(struct ehci_platform_priv),
131 };
132 
133 static struct usb_ehci_pdata ehci_platform_defaults = {
134         .power_on =             ehci_platform_power_on,
135         .power_suspend =        ehci_platform_power_off,
136         .power_off =            ehci_platform_power_off,
137 };
138 
139 static int ehci_platform_probe(struct platform_device *dev)
140 {
141         struct usb_hcd *hcd;
142         struct resource *res_mem;
143         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
144         struct ehci_platform_priv *priv;
145         struct ehci_hcd *ehci;
146         int err, irq, clk = 0;
147 
148         if (usb_disabled())
149                 return -ENODEV;
150 
151         /*
152          * Use reasonable defaults so platforms don't have to provide these
153          * with DT probing on ARM.
154          */
155         if (!pdata)
156                 pdata = &ehci_platform_defaults;
157 
158         err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
159         if (err)
160                 return err;
161 
162         irq = platform_get_irq(dev, 0);
163         if (irq < 0) {
164                 dev_err(&dev->dev, "no irq provided");
165                 return irq;
166         }
167         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
168         if (!res_mem) {
169                 dev_err(&dev->dev, "no memory resource provided");
170                 return -ENXIO;
171         }
172 
173         hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
174                              dev_name(&dev->dev));
175         if (!hcd)
176                 return -ENOMEM;
177 
178         platform_set_drvdata(dev, hcd);
179         dev->dev.platform_data = pdata;
180         priv = hcd_to_ehci_priv(hcd);
181         ehci = hcd_to_ehci(hcd);
182 
183         if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
184                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
185                         ehci->big_endian_mmio = 1;
186 
187                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
188                         ehci->big_endian_desc = 1;
189 
190                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
191                         ehci->big_endian_mmio = ehci->big_endian_desc = 1;
192 
193                 priv->phy = devm_phy_get(&dev->dev, "usb");
194                 if (IS_ERR(priv->phy)) {
195                         err = PTR_ERR(priv->phy);
196                         if (err == -EPROBE_DEFER)
197                                 goto err_put_hcd;
198                         priv->phy = NULL;
199                 }
200 
201                 for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
202                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
203                         if (IS_ERR(priv->clks[clk])) {
204                                 err = PTR_ERR(priv->clks[clk]);
205                                 if (err == -EPROBE_DEFER)
206                                         goto err_put_clks;
207                                 priv->clks[clk] = NULL;
208                                 break;
209                         }
210                 }
211         }
212 
213         priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
214         if (IS_ERR(priv->rst)) {
215                 err = PTR_ERR(priv->rst);
216                 if (err == -EPROBE_DEFER)
217                         goto err_put_clks;
218                 priv->rst = NULL;
219         } else {
220                 err = reset_control_deassert(priv->rst);
221                 if (err)
222                         goto err_put_clks;
223         }
224 
225         if (pdata->big_endian_desc)
226                 ehci->big_endian_desc = 1;
227         if (pdata->big_endian_mmio)
228                 ehci->big_endian_mmio = 1;
229 
230 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
231         if (ehci->big_endian_mmio) {
232                 dev_err(&dev->dev,
233                         "Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
234                 err = -EINVAL;
235                 goto err_reset;
236         }
237 #endif
238 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
239         if (ehci->big_endian_desc) {
240                 dev_err(&dev->dev,
241                         "Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
242                 err = -EINVAL;
243                 goto err_reset;
244         }
245 #endif
246 
247         if (pdata->power_on) {
248                 err = pdata->power_on(dev);
249                 if (err < 0)
250                         goto err_reset;
251         }
252 
253         hcd->rsrc_start = res_mem->start;
254         hcd->rsrc_len = resource_size(res_mem);
255 
256         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
257         if (IS_ERR(hcd->regs)) {
258                 err = PTR_ERR(hcd->regs);
259                 goto err_power;
260         }
261         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
262         if (err)
263                 goto err_power;
264 
265         device_wakeup_enable(hcd->self.controller);
266         platform_set_drvdata(dev, hcd);
267 
268         return err;
269 
270 err_power:
271         if (pdata->power_off)
272                 pdata->power_off(dev);
273 err_reset:
274         if (priv->rst)
275                 reset_control_assert(priv->rst);
276 err_put_clks:
277         while (--clk >= 0)
278                 clk_put(priv->clks[clk]);
279 err_put_hcd:
280         if (pdata == &ehci_platform_defaults)
281                 dev->dev.platform_data = NULL;
282 
283         usb_put_hcd(hcd);
284 
285         return err;
286 }
287 
288 static int ehci_platform_remove(struct platform_device *dev)
289 {
290         struct usb_hcd *hcd = platform_get_drvdata(dev);
291         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
292         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
293         int clk;
294 
295         usb_remove_hcd(hcd);
296 
297         if (pdata->power_off)
298                 pdata->power_off(dev);
299 
300         if (priv->rst)
301                 reset_control_assert(priv->rst);
302 
303         for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
304                 clk_put(priv->clks[clk]);
305 
306         usb_put_hcd(hcd);
307 
308         if (pdata == &ehci_platform_defaults)
309                 dev->dev.platform_data = NULL;
310 
311         return 0;
312 }
313 
314 #ifdef CONFIG_PM
315 
316 static int ehci_platform_suspend(struct device *dev)
317 {
318         struct usb_hcd *hcd = dev_get_drvdata(dev);
319         struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
320         struct platform_device *pdev =
321                 container_of(dev, struct platform_device, dev);
322         bool do_wakeup = device_may_wakeup(dev);
323         int ret;
324 
325         ret = ehci_suspend(hcd, do_wakeup);
326         if (ret)
327                 return ret;
328 
329         if (pdata->power_suspend)
330                 pdata->power_suspend(pdev);
331 
332         return ret;
333 }
334 
335 static int ehci_platform_resume(struct device *dev)
336 {
337         struct usb_hcd *hcd = dev_get_drvdata(dev);
338         struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
339         struct platform_device *pdev =
340                 container_of(dev, struct platform_device, dev);
341 
342         if (pdata->power_on) {
343                 int err = pdata->power_on(pdev);
344                 if (err < 0)
345                         return err;
346         }
347 
348         ehci_resume(hcd, false);
349         return 0;
350 }
351 
352 #else /* !CONFIG_PM */
353 #define ehci_platform_suspend   NULL
354 #define ehci_platform_resume    NULL
355 #endif /* CONFIG_PM */
356 
357 static const struct of_device_id vt8500_ehci_ids[] = {
358         { .compatible = "via,vt8500-ehci", },
359         { .compatible = "wm,prizm-ehci", },
360         { .compatible = "generic-ehci", },
361         {}
362 };
363 MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
364 
365 static const struct platform_device_id ehci_platform_table[] = {
366         { "ehci-platform", 0 },
367         { }
368 };
369 MODULE_DEVICE_TABLE(platform, ehci_platform_table);
370 
371 static const struct dev_pm_ops ehci_platform_pm_ops = {
372         .suspend        = ehci_platform_suspend,
373         .resume         = ehci_platform_resume,
374 };
375 
376 static struct platform_driver ehci_platform_driver = {
377         .id_table       = ehci_platform_table,
378         .probe          = ehci_platform_probe,
379         .remove         = ehci_platform_remove,
380         .shutdown       = usb_hcd_platform_shutdown,
381         .driver         = {
382                 .owner  = THIS_MODULE,
383                 .name   = "ehci-platform",
384                 .pm     = &ehci_platform_pm_ops,
385                 .of_match_table = vt8500_ehci_ids,
386         }
387 };
388 
389 static int __init ehci_platform_init(void)
390 {
391         if (usb_disabled())
392                 return -ENODEV;
393 
394         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
395 
396         ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
397         return platform_driver_register(&ehci_platform_driver);
398 }
399 module_init(ehci_platform_init);
400 
401 static void __exit ehci_platform_cleanup(void)
402 {
403         platform_driver_unregister(&ehci_platform_driver);
404 }
405 module_exit(ehci_platform_cleanup);
406 
407 MODULE_DESCRIPTION(DRIVER_DESC);
408 MODULE_AUTHOR("Hauke Mehrtens");
409 MODULE_AUTHOR("Alan Stern");
410 MODULE_LICENSE("GPL");
411 

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