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

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