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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_power_on(struct platform_device *dev)
 47 {
 48         struct usb_hcd *hcd = platform_get_drvdata(dev);
 49         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 50         int clk, ret;
 51 
 52         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
 53                 ret = clk_prepare_enable(priv->clks[clk]);
 54                 if (ret)
 55                         goto err_disable_clks;
 56         }
 57 
 58         if (priv->phy) {
 59                 ret = phy_init(priv->phy);
 60                 if (ret)
 61                         goto err_disable_clks;
 62 
 63                 ret = phy_power_on(priv->phy);
 64                 if (ret)
 65                         goto err_exit_phy;
 66         }
 67 
 68         return 0;
 69 
 70 err_exit_phy:
 71         phy_exit(priv->phy);
 72 err_disable_clks:
 73         while (--clk >= 0)
 74                 clk_disable_unprepare(priv->clks[clk]);
 75 
 76         return ret;
 77 }
 78 
 79 static void ohci_platform_power_off(struct platform_device *dev)
 80 {
 81         struct usb_hcd *hcd = platform_get_drvdata(dev);
 82         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 83         int clk;
 84 
 85         if (priv->phy) {
 86                 phy_power_off(priv->phy);
 87                 phy_exit(priv->phy);
 88         }
 89 
 90         for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
 91                 if (priv->clks[clk])
 92                         clk_disable_unprepare(priv->clks[clk]);
 93 }
 94 
 95 static struct hc_driver __read_mostly ohci_platform_hc_driver;
 96 
 97 static const struct ohci_driver_overrides platform_overrides __initconst = {
 98         .product_desc =         "Generic Platform OHCI controller",
 99         .extra_priv_size =      sizeof(struct ohci_platform_priv),
100 };
101 
102 static struct usb_ohci_pdata ohci_platform_defaults = {
103         .power_on =             ohci_platform_power_on,
104         .power_suspend =        ohci_platform_power_off,
105         .power_off =            ohci_platform_power_off,
106 };
107 
108 static int ohci_platform_probe(struct platform_device *dev)
109 {
110         struct usb_hcd *hcd;
111         struct resource *res_mem;
112         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
113         struct ohci_platform_priv *priv;
114         struct ohci_hcd *ohci;
115         int err, irq, clk = 0;
116 
117         if (usb_disabled())
118                 return -ENODEV;
119 
120         /*
121          * Use reasonable defaults so platforms don't have to provide these
122          * with DT probing on ARM.
123          */
124         if (!pdata)
125                 pdata = &ohci_platform_defaults;
126 
127         err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
128         if (err)
129                 return err;
130 
131         irq = platform_get_irq(dev, 0);
132         if (irq < 0) {
133                 dev_err(&dev->dev, "no irq provided");
134                 return irq;
135         }
136 
137         hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
138                         dev_name(&dev->dev));
139         if (!hcd)
140                 return -ENOMEM;
141 
142         platform_set_drvdata(dev, hcd);
143         dev->dev.platform_data = pdata;
144         priv = hcd_to_ohci_priv(hcd);
145         ohci = hcd_to_ohci(hcd);
146 
147         if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
148                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
149                         ohci->flags |= OHCI_QUIRK_BE_MMIO;
150 
151                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
152                         ohci->flags |= OHCI_QUIRK_BE_DESC;
153 
154                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
155                         ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
156 
157                 if (of_property_read_bool(dev->dev.of_node, "no-big-frame-no"))
158                         ohci->flags |= OHCI_QUIRK_FRAME_NO;
159 
160                 of_property_read_u32(dev->dev.of_node, "num-ports",
161                                      &ohci->num_ports);
162 
163                 priv->phy = devm_phy_get(&dev->dev, "usb");
164                 if (IS_ERR(priv->phy)) {
165                         err = PTR_ERR(priv->phy);
166                         if (err == -EPROBE_DEFER)
167                                 goto err_put_hcd;
168                         priv->phy = NULL;
169                 }
170 
171                 for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
172                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
173                         if (IS_ERR(priv->clks[clk])) {
174                                 err = PTR_ERR(priv->clks[clk]);
175                                 if (err == -EPROBE_DEFER)
176                                         goto err_put_clks;
177                                 priv->clks[clk] = NULL;
178                                 break;
179                         }
180                 }
181 
182         }
183 
184         priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
185         if (IS_ERR(priv->rst)) {
186                 err = PTR_ERR(priv->rst);
187                 if (err == -EPROBE_DEFER)
188                         goto err_put_clks;
189                 priv->rst = NULL;
190         } else {
191                 err = reset_control_deassert(priv->rst);
192                 if (err)
193                         goto err_put_clks;
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         if (pdata->no_big_frame_no)
201                 ohci->flags |= OHCI_QUIRK_FRAME_NO;
202         if (pdata->num_ports)
203                 ohci->num_ports = pdata->num_ports;
204 
205 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
206         if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
207                 dev_err(&dev->dev,
208                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
209                 err = -EINVAL;
210                 goto err_reset;
211         }
212 #endif
213 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
214         if (ohci->flags & OHCI_QUIRK_BE_DESC) {
215                 dev_err(&dev->dev,
216                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n");
217                 err = -EINVAL;
218                 goto err_reset;
219         }
220 #endif
221 
222         if (pdata->power_on) {
223                 err = pdata->power_on(dev);
224                 if (err < 0)
225                         goto err_reset;
226         }
227 
228         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
229         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
230         if (IS_ERR(hcd->regs)) {
231                 err = PTR_ERR(hcd->regs);
232                 goto err_power;
233         }
234         hcd->rsrc_start = res_mem->start;
235         hcd->rsrc_len = resource_size(res_mem);
236 
237         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
238         if (err)
239                 goto err_power;
240 
241         device_wakeup_enable(hcd->self.controller);
242 
243         platform_set_drvdata(dev, hcd);
244 
245         return err;
246 
247 err_power:
248         if (pdata->power_off)
249                 pdata->power_off(dev);
250 err_reset:
251         if (priv->rst)
252                 reset_control_assert(priv->rst);
253 err_put_clks:
254         while (--clk >= 0)
255                 clk_put(priv->clks[clk]);
256 err_put_hcd:
257         if (pdata == &ohci_platform_defaults)
258                 dev->dev.platform_data = NULL;
259 
260         usb_put_hcd(hcd);
261 
262         return err;
263 }
264 
265 static int ohci_platform_remove(struct platform_device *dev)
266 {
267         struct usb_hcd *hcd = platform_get_drvdata(dev);
268         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
269         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
270         int clk;
271 
272         usb_remove_hcd(hcd);
273 
274         if (pdata->power_off)
275                 pdata->power_off(dev);
276 
277         if (priv->rst)
278                 reset_control_assert(priv->rst);
279 
280         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
281                 clk_put(priv->clks[clk]);
282 
283         usb_put_hcd(hcd);
284 
285         if (pdata == &ohci_platform_defaults)
286                 dev->dev.platform_data = NULL;
287 
288         return 0;
289 }
290 
291 #ifdef CONFIG_PM_SLEEP
292 static int ohci_platform_suspend(struct device *dev)
293 {
294         struct usb_hcd *hcd = dev_get_drvdata(dev);
295         struct usb_ohci_pdata *pdata = dev->platform_data;
296         struct platform_device *pdev =
297                 container_of(dev, struct platform_device, dev);
298         bool do_wakeup = device_may_wakeup(dev);
299         int ret;
300 
301         ret = ohci_suspend(hcd, do_wakeup);
302         if (ret)
303                 return ret;
304 
305         if (pdata->power_suspend)
306                 pdata->power_suspend(pdev);
307 
308         return ret;
309 }
310 
311 static int ohci_platform_resume(struct device *dev)
312 {
313         struct usb_hcd *hcd = dev_get_drvdata(dev);
314         struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
315         struct platform_device *pdev =
316                 container_of(dev, struct platform_device, dev);
317 
318         if (pdata->power_on) {
319                 int err = pdata->power_on(pdev);
320                 if (err < 0)
321                         return err;
322         }
323 
324         ohci_resume(hcd, false);
325         return 0;
326 }
327 #endif /* CONFIG_PM_SLEEP */
328 
329 static const struct of_device_id ohci_platform_ids[] = {
330         { .compatible = "generic-ohci", },
331         { }
332 };
333 MODULE_DEVICE_TABLE(of, ohci_platform_ids);
334 
335 static const struct platform_device_id ohci_platform_table[] = {
336         { "ohci-platform", 0 },
337         { }
338 };
339 MODULE_DEVICE_TABLE(platform, ohci_platform_table);
340 
341 static SIMPLE_DEV_PM_OPS(ohci_platform_pm_ops, ohci_platform_suspend,
342         ohci_platform_resume);
343 
344 static struct platform_driver ohci_platform_driver = {
345         .id_table       = ohci_platform_table,
346         .probe          = ohci_platform_probe,
347         .remove         = ohci_platform_remove,
348         .shutdown       = usb_hcd_platform_shutdown,
349         .driver         = {
350                 .name   = "ohci-platform",
351                 .pm     = &ohci_platform_pm_ops,
352                 .of_match_table = ohci_platform_ids,
353         }
354 };
355 
356 static int __init ohci_platform_init(void)
357 {
358         if (usb_disabled())
359                 return -ENODEV;
360 
361         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
362 
363         ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
364         return platform_driver_register(&ohci_platform_driver);
365 }
366 module_init(ohci_platform_init);
367 
368 static void __exit ohci_platform_cleanup(void)
369 {
370         platform_driver_unregister(&ohci_platform_driver);
371 }
372 module_exit(ohci_platform_cleanup);
373 
374 MODULE_DESCRIPTION(DRIVER_DESC);
375 MODULE_AUTHOR("Hauke Mehrtens");
376 MODULE_AUTHOR("Alan Stern");
377 MODULE_LICENSE("GPL");
378 

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