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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/reset.h>
 28 #include <linux/usb/ohci_pdriver.h>
 29 #include <linux/usb.h>
 30 #include <linux/usb/hcd.h>
 31 
 32 #include "ohci.h"
 33 
 34 #define DRIVER_DESC "OHCI generic platform driver"
 35 #define OHCI_MAX_CLKS 3
 36 #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
 37 
 38 struct ohci_platform_priv {
 39         struct clk *clks[OHCI_MAX_CLKS];
 40         struct reset_control *rst;
 41         struct phy *phy;
 42 };
 43 
 44 static const char hcd_name[] = "ohci-platform";
 45 
 46 static int ohci_platform_reset(struct usb_hcd *hcd)
 47 {
 48         struct platform_device *pdev = to_platform_device(hcd->self.controller);
 49         struct usb_ohci_pdata *pdata = dev_get_platdata(&pdev->dev);
 50         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 51 
 52         if (pdata->no_big_frame_no)
 53                 ohci->flags |= OHCI_QUIRK_FRAME_NO;
 54         if (pdata->num_ports)
 55                 ohci->num_ports = pdata->num_ports;
 56 
 57         return ohci_setup(hcd);
 58 }
 59 
 60 static int ohci_platform_power_on(struct platform_device *dev)
 61 {
 62         struct usb_hcd *hcd = platform_get_drvdata(dev);
 63         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 64         int clk, ret;
 65 
 66         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
 67                 ret = clk_prepare_enable(priv->clks[clk]);
 68                 if (ret)
 69                         goto err_disable_clks;
 70         }
 71 
 72         if (priv->phy) {
 73                 ret = phy_init(priv->phy);
 74                 if (ret)
 75                         goto err_disable_clks;
 76 
 77                 ret = phy_power_on(priv->phy);
 78                 if (ret)
 79                         goto err_exit_phy;
 80         }
 81 
 82         return 0;
 83 
 84 err_exit_phy:
 85         phy_exit(priv->phy);
 86 err_disable_clks:
 87         while (--clk >= 0)
 88                 clk_disable_unprepare(priv->clks[clk]);
 89 
 90         return ret;
 91 }
 92 
 93 static void ohci_platform_power_off(struct platform_device *dev)
 94 {
 95         struct usb_hcd *hcd = platform_get_drvdata(dev);
 96         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 97         int clk;
 98 
 99         if (priv->phy) {
100                 phy_power_off(priv->phy);
101                 phy_exit(priv->phy);
102         }
103 
104         for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
105                 if (priv->clks[clk])
106                         clk_disable_unprepare(priv->clks[clk]);
107 }
108 
109 static struct hc_driver __read_mostly ohci_platform_hc_driver;
110 
111 static const struct ohci_driver_overrides platform_overrides __initconst = {
112         .product_desc =         "Generic Platform OHCI controller",
113         .reset =                ohci_platform_reset,
114         .extra_priv_size =      sizeof(struct ohci_platform_priv),
115 };
116 
117 static struct usb_ohci_pdata ohci_platform_defaults = {
118         .power_on =             ohci_platform_power_on,
119         .power_suspend =        ohci_platform_power_off,
120         .power_off =            ohci_platform_power_off,
121 };
122 
123 static int ohci_platform_probe(struct platform_device *dev)
124 {
125         struct usb_hcd *hcd;
126         struct resource *res_mem;
127         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
128         struct ohci_platform_priv *priv;
129         struct ohci_hcd *ohci;
130         int err, irq, clk = 0;
131 
132         if (usb_disabled())
133                 return -ENODEV;
134 
135         /*
136          * Use reasonable defaults so platforms don't have to provide these
137          * with DT probing on ARM.
138          */
139         if (!pdata)
140                 pdata = &ohci_platform_defaults;
141 
142         err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
143         if (err)
144                 return err;
145 
146         irq = platform_get_irq(dev, 0);
147         if (irq < 0) {
148                 dev_err(&dev->dev, "no irq provided");
149                 return irq;
150         }
151 
152         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
153         if (!res_mem) {
154                 dev_err(&dev->dev, "no memory resource provided");
155                 return -ENXIO;
156         }
157 
158         hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
159                         dev_name(&dev->dev));
160         if (!hcd)
161                 return -ENOMEM;
162 
163         platform_set_drvdata(dev, hcd);
164         dev->dev.platform_data = pdata;
165         priv = hcd_to_ohci_priv(hcd);
166         ohci = hcd_to_ohci(hcd);
167 
168         if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
169                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
170                         ohci->flags |= OHCI_QUIRK_BE_MMIO;
171 
172                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
173                         ohci->flags |= OHCI_QUIRK_BE_DESC;
174 
175                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
176                         ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
177 
178                 priv->phy = devm_phy_get(&dev->dev, "usb");
179                 if (IS_ERR(priv->phy)) {
180                         err = PTR_ERR(priv->phy);
181                         if (err == -EPROBE_DEFER)
182                                 goto err_put_hcd;
183                         priv->phy = NULL;
184                 }
185 
186                 for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
187                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
188                         if (IS_ERR(priv->clks[clk])) {
189                                 err = PTR_ERR(priv->clks[clk]);
190                                 if (err == -EPROBE_DEFER)
191                                         goto err_put_clks;
192                                 priv->clks[clk] = NULL;
193                                 break;
194                         }
195                 }
196 
197         }
198 
199         priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
200         if (IS_ERR(priv->rst)) {
201                 err = PTR_ERR(priv->rst);
202                 if (err == -EPROBE_DEFER)
203                         goto err_put_clks;
204                 priv->rst = NULL;
205         } else {
206                 err = reset_control_deassert(priv->rst);
207                 if (err)
208                         goto err_put_clks;
209         }
210 
211         if (pdata->big_endian_desc)
212                 ohci->flags |= OHCI_QUIRK_BE_DESC;
213         if (pdata->big_endian_mmio)
214                 ohci->flags |= OHCI_QUIRK_BE_MMIO;
215 
216 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
217         if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
218                 dev_err(&dev->dev,
219                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
220                 err = -EINVAL;
221                 goto err_reset;
222         }
223 #endif
224 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
225         if (ohci->flags & OHCI_QUIRK_BE_DESC) {
226                 dev_err(&dev->dev,
227                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n");
228                 err = -EINVAL;
229                 goto err_reset;
230         }
231 #endif
232 
233         if (pdata->power_on) {
234                 err = pdata->power_on(dev);
235                 if (err < 0)
236                         goto err_reset;
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 
253         platform_set_drvdata(dev, hcd);
254 
255         return err;
256 
257 err_power:
258         if (pdata->power_off)
259                 pdata->power_off(dev);
260 err_reset:
261         if (priv->rst)
262                 reset_control_assert(priv->rst);
263 err_put_clks:
264         while (--clk >= 0)
265                 clk_put(priv->clks[clk]);
266 err_put_hcd:
267         if (pdata == &ohci_platform_defaults)
268                 dev->dev.platform_data = NULL;
269 
270         usb_put_hcd(hcd);
271 
272         return err;
273 }
274 
275 static int ohci_platform_remove(struct platform_device *dev)
276 {
277         struct usb_hcd *hcd = platform_get_drvdata(dev);
278         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
279         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
280         int clk;
281 
282         usb_remove_hcd(hcd);
283 
284         if (pdata->power_off)
285                 pdata->power_off(dev);
286 
287         if (priv->rst)
288                 reset_control_assert(priv->rst);
289 
290         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
291                 clk_put(priv->clks[clk]);
292 
293         usb_put_hcd(hcd);
294 
295         if (pdata == &ohci_platform_defaults)
296                 dev->dev.platform_data = NULL;
297 
298         return 0;
299 }
300 
301 #ifdef CONFIG_PM
302 
303 static int ohci_platform_suspend(struct device *dev)
304 {
305         struct usb_hcd *hcd = dev_get_drvdata(dev);
306         struct usb_ohci_pdata *pdata = dev->platform_data;
307         struct platform_device *pdev =
308                 container_of(dev, struct platform_device, dev);
309         bool do_wakeup = device_may_wakeup(dev);
310         int ret;
311 
312         ret = ohci_suspend(hcd, do_wakeup);
313         if (ret)
314                 return ret;
315 
316         if (pdata->power_suspend)
317                 pdata->power_suspend(pdev);
318 
319         return ret;
320 }
321 
322 static int ohci_platform_resume(struct device *dev)
323 {
324         struct usb_hcd *hcd = dev_get_drvdata(dev);
325         struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
326         struct platform_device *pdev =
327                 container_of(dev, struct platform_device, dev);
328 
329         if (pdata->power_on) {
330                 int err = pdata->power_on(pdev);
331                 if (err < 0)
332                         return err;
333         }
334 
335         ohci_resume(hcd, false);
336         return 0;
337 }
338 
339 #else /* !CONFIG_PM */
340 #define ohci_platform_suspend   NULL
341 #define ohci_platform_resume    NULL
342 #endif /* CONFIG_PM */
343 
344 static const struct of_device_id ohci_platform_ids[] = {
345         { .compatible = "generic-ohci", },
346         { }
347 };
348 MODULE_DEVICE_TABLE(of, ohci_platform_ids);
349 
350 static const struct platform_device_id ohci_platform_table[] = {
351         { "ohci-platform", 0 },
352         { }
353 };
354 MODULE_DEVICE_TABLE(platform, ohci_platform_table);
355 
356 static const struct dev_pm_ops ohci_platform_pm_ops = {
357         .suspend        = ohci_platform_suspend,
358         .resume         = ohci_platform_resume,
359 };
360 
361 static struct platform_driver ohci_platform_driver = {
362         .id_table       = ohci_platform_table,
363         .probe          = ohci_platform_probe,
364         .remove         = ohci_platform_remove,
365         .shutdown       = usb_hcd_platform_shutdown,
366         .driver         = {
367                 .owner  = THIS_MODULE,
368                 .name   = "ohci-platform",
369                 .pm     = &ohci_platform_pm_ops,
370                 .of_match_table = ohci_platform_ids,
371         }
372 };
373 
374 static int __init ohci_platform_init(void)
375 {
376         if (usb_disabled())
377                 return -ENODEV;
378 
379         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
380 
381         ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
382         return platform_driver_register(&ohci_platform_driver);
383 }
384 module_init(ohci_platform_init);
385 
386 static void __exit ohci_platform_cleanup(void)
387 {
388         platform_driver_unregister(&ohci_platform_driver);
389 }
390 module_exit(ohci_platform_cleanup);
391 
392 MODULE_DESCRIPTION(DRIVER_DESC);
393 MODULE_AUTHOR("Hauke Mehrtens");
394 MODULE_AUTHOR("Alan Stern");
395 MODULE_LICENSE("GPL");
396 

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