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

  1 /*
  2  * Generic platform ohci driver
  3  *
  4  * Copyright 2007 Michael Buesch <m@bues.ch>
  5  * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
  6  * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
  7  *
  8  * Derived from the OCHI-SSB driver
  9  * Derived from the OHCI-PCI driver
 10  * Copyright 1999 Roman Weissgaerber
 11  * Copyright 2000-2002 David Brownell
 12  * Copyright 1999 Linus Torvalds
 13  * Copyright 1999 Gregory P. Smith
 14  *
 15  * Licensed under the GNU/GPL. See COPYING for details.
 16  */
 17 
 18 #include <linux/clk.h>
 19 #include <linux/dma-mapping.h>
 20 #include <linux/hrtimer.h>
 21 #include <linux/io.h>
 22 #include <linux/kernel.h>
 23 #include <linux/module.h>
 24 #include <linux/err.h>
 25 #include <linux/phy/phy.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/usb/ohci_pdriver.h>
 28 #include <linux/usb.h>
 29 #include <linux/usb/hcd.h>
 30 
 31 #include "ohci.h"
 32 
 33 #define DRIVER_DESC "OHCI generic platform driver"
 34 #define OHCI_MAX_CLKS 3
 35 #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
 36 
 37 struct ohci_platform_priv {
 38         struct clk *clks[OHCI_MAX_CLKS];
 39         struct phy *phy;
 40 };
 41 
 42 static const char hcd_name[] = "ohci-platform";
 43 
 44 static int ohci_platform_reset(struct usb_hcd *hcd)
 45 {
 46         struct platform_device *pdev = to_platform_device(hcd->self.controller);
 47         struct usb_ohci_pdata *pdata = dev_get_platdata(&pdev->dev);
 48         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 49 
 50         if (pdata->no_big_frame_no)
 51                 ohci->flags |= OHCI_QUIRK_FRAME_NO;
 52         if (pdata->num_ports)
 53                 ohci->num_ports = pdata->num_ports;
 54 
 55         return ohci_setup(hcd);
 56 }
 57 
 58 static int ohci_platform_power_on(struct platform_device *dev)
 59 {
 60         struct usb_hcd *hcd = platform_get_drvdata(dev);
 61         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 62         int clk, ret;
 63 
 64         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
 65                 ret = clk_prepare_enable(priv->clks[clk]);
 66                 if (ret)
 67                         goto err_disable_clks;
 68         }
 69 
 70         if (priv->phy) {
 71                 ret = phy_init(priv->phy);
 72                 if (ret)
 73                         goto err_disable_clks;
 74 
 75                 ret = phy_power_on(priv->phy);
 76                 if (ret)
 77                         goto err_exit_phy;
 78         }
 79 
 80         return 0;
 81 
 82 err_exit_phy:
 83         phy_exit(priv->phy);
 84 err_disable_clks:
 85         while (--clk >= 0)
 86                 clk_disable_unprepare(priv->clks[clk]);
 87 
 88         return ret;
 89 }
 90 
 91 static void ohci_platform_power_off(struct platform_device *dev)
 92 {
 93         struct usb_hcd *hcd = platform_get_drvdata(dev);
 94         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 95         int clk;
 96 
 97         if (priv->phy) {
 98                 phy_power_off(priv->phy);
 99                 phy_exit(priv->phy);
100         }
101 
102         for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
103                 if (priv->clks[clk])
104                         clk_disable_unprepare(priv->clks[clk]);
105 }
106 
107 static struct hc_driver __read_mostly ohci_platform_hc_driver;
108 
109 static const struct ohci_driver_overrides platform_overrides __initconst = {
110         .product_desc =         "Generic Platform OHCI controller",
111         .reset =                ohci_platform_reset,
112         .extra_priv_size =      sizeof(struct ohci_platform_priv),
113 };
114 
115 static struct usb_ohci_pdata ohci_platform_defaults = {
116         .power_on =             ohci_platform_power_on,
117         .power_suspend =        ohci_platform_power_off,
118         .power_off =            ohci_platform_power_off,
119 };
120 
121 static int ohci_platform_probe(struct platform_device *dev)
122 {
123         struct usb_hcd *hcd;
124         struct resource *res_mem;
125         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
126         struct ohci_platform_priv *priv;
127         struct ohci_hcd *ohci;
128         int err, irq, clk = 0;
129 
130         if (usb_disabled())
131                 return -ENODEV;
132 
133         /*
134          * Use reasonable defaults so platforms don't have to provide these
135          * with DT probing on ARM.
136          */
137         if (!pdata)
138                 pdata = &ohci_platform_defaults;
139 
140         err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
141         if (err)
142                 return err;
143 
144         irq = platform_get_irq(dev, 0);
145         if (irq < 0) {
146                 dev_err(&dev->dev, "no irq provided");
147                 return irq;
148         }
149 
150         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
151         if (!res_mem) {
152                 dev_err(&dev->dev, "no memory resource provided");
153                 return -ENXIO;
154         }
155 
156         hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
157                         dev_name(&dev->dev));
158         if (!hcd)
159                 return -ENOMEM;
160 
161         platform_set_drvdata(dev, hcd);
162         dev->dev.platform_data = pdata;
163         priv = hcd_to_ohci_priv(hcd);
164         ohci = hcd_to_ohci(hcd);
165 
166         if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
167                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
168                         ohci->flags |= OHCI_QUIRK_BE_MMIO;
169 
170                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
171                         ohci->flags |= OHCI_QUIRK_BE_DESC;
172 
173                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
174                         ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
175 
176                 priv->phy = devm_phy_get(&dev->dev, "usb");
177                 if (IS_ERR(priv->phy)) {
178                         err = PTR_ERR(priv->phy);
179                         if (err == -EPROBE_DEFER)
180                                 goto err_put_hcd;
181                         priv->phy = NULL;
182                 }
183 
184                 for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
185                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
186                         if (IS_ERR(priv->clks[clk])) {
187                                 err = PTR_ERR(priv->clks[clk]);
188                                 if (err == -EPROBE_DEFER)
189                                         goto err_put_clks;
190                                 priv->clks[clk] = NULL;
191                                 break;
192                         }
193                 }
194         }
195 
196         if (pdata->big_endian_desc)
197                 ohci->flags |= OHCI_QUIRK_BE_DESC;
198         if (pdata->big_endian_mmio)
199                 ohci->flags |= OHCI_QUIRK_BE_MMIO;
200 
201 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
202         if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
203                 dev_err(&dev->dev,
204                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
205                 err = -EINVAL;
206                 goto err_put_clks;
207         }
208 #endif
209 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
210         if (ohci->flags & OHCI_QUIRK_BE_DESC) {
211                 dev_err(&dev->dev,
212                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n");
213                 err = -EINVAL;
214                 goto err_put_clks;
215         }
216 #endif
217 
218         if (pdata->power_on) {
219                 err = pdata->power_on(dev);
220                 if (err < 0)
221                         goto err_put_clks;
222         }
223 
224         hcd->rsrc_start = res_mem->start;
225         hcd->rsrc_len = resource_size(res_mem);
226 
227         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
228         if (IS_ERR(hcd->regs)) {
229                 err = PTR_ERR(hcd->regs);
230                 goto err_power;
231         }
232         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
233         if (err)
234                 goto err_power;
235 
236         device_wakeup_enable(hcd->self.controller);
237 
238         platform_set_drvdata(dev, hcd);
239 
240         return err;
241 
242 err_power:
243         if (pdata->power_off)
244                 pdata->power_off(dev);
245 err_put_clks:
246         while (--clk >= 0)
247                 clk_put(priv->clks[clk]);
248 err_put_hcd:
249         if (pdata == &ohci_platform_defaults)
250                 dev->dev.platform_data = NULL;
251 
252         usb_put_hcd(hcd);
253 
254         return err;
255 }
256 
257 static int ohci_platform_remove(struct platform_device *dev)
258 {
259         struct usb_hcd *hcd = platform_get_drvdata(dev);
260         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
261         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
262         int clk;
263 
264         usb_remove_hcd(hcd);
265 
266         if (pdata->power_off)
267                 pdata->power_off(dev);
268 
269         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
270                 clk_put(priv->clks[clk]);
271 
272         usb_put_hcd(hcd);
273 
274         if (pdata == &ohci_platform_defaults)
275                 dev->dev.platform_data = NULL;
276 
277         return 0;
278 }
279 
280 #ifdef CONFIG_PM
281 
282 static int ohci_platform_suspend(struct device *dev)
283 {
284         struct usb_hcd *hcd = dev_get_drvdata(dev);
285         struct usb_ohci_pdata *pdata = dev->platform_data;
286         struct platform_device *pdev =
287                 container_of(dev, struct platform_device, dev);
288         bool do_wakeup = device_may_wakeup(dev);
289         int ret;
290 
291         ret = ohci_suspend(hcd, do_wakeup);
292         if (ret)
293                 return ret;
294 
295         if (pdata->power_suspend)
296                 pdata->power_suspend(pdev);
297 
298         return ret;
299 }
300 
301 static int ohci_platform_resume(struct device *dev)
302 {
303         struct usb_hcd *hcd = dev_get_drvdata(dev);
304         struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
305         struct platform_device *pdev =
306                 container_of(dev, struct platform_device, dev);
307 
308         if (pdata->power_on) {
309                 int err = pdata->power_on(pdev);
310                 if (err < 0)
311                         return err;
312         }
313 
314         ohci_resume(hcd, false);
315         return 0;
316 }
317 
318 #else /* !CONFIG_PM */
319 #define ohci_platform_suspend   NULL
320 #define ohci_platform_resume    NULL
321 #endif /* CONFIG_PM */
322 
323 static const struct of_device_id ohci_platform_ids[] = {
324         { .compatible = "generic-ohci", },
325         { }
326 };
327 MODULE_DEVICE_TABLE(of, ohci_platform_ids);
328 
329 static const struct platform_device_id ohci_platform_table[] = {
330         { "ohci-platform", 0 },
331         { }
332 };
333 MODULE_DEVICE_TABLE(platform, ohci_platform_table);
334 
335 static const struct dev_pm_ops ohci_platform_pm_ops = {
336         .suspend        = ohci_platform_suspend,
337         .resume         = ohci_platform_resume,
338 };
339 
340 static struct platform_driver ohci_platform_driver = {
341         .id_table       = ohci_platform_table,
342         .probe          = ohci_platform_probe,
343         .remove         = ohci_platform_remove,
344         .shutdown       = usb_hcd_platform_shutdown,
345         .driver         = {
346                 .owner  = THIS_MODULE,
347                 .name   = "ohci-platform",
348                 .pm     = &ohci_platform_pm_ops,
349                 .of_match_table = ohci_platform_ids,
350         }
351 };
352 
353 static int __init ohci_platform_init(void)
354 {
355         if (usb_disabled())
356                 return -ENODEV;
357 
358         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
359 
360         ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
361         return platform_driver_register(&ohci_platform_driver);
362 }
363 module_init(ohci_platform_init);
364 
365 static void __exit ohci_platform_cleanup(void)
366 {
367         platform_driver_unregister(&ohci_platform_driver);
368 }
369 module_exit(ohci_platform_cleanup);
370 
371 MODULE_DESCRIPTION(DRIVER_DESC);
372 MODULE_AUTHOR("Hauke Mehrtens");
373 MODULE_AUTHOR("Alan Stern");
374 MODULE_LICENSE("GPL");
375 

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