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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 OHCI_MAX_RESETS 2
 37 #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
 38 
 39 struct ohci_platform_priv {
 40         struct clk *clks[OHCI_MAX_CLKS];
 41         struct reset_control *resets[OHCI_MAX_RESETS];
 42         struct phy **phys;
 43         int num_phys;
 44 };
 45 
 46 static const char hcd_name[] = "ohci-platform";
 47 
 48 static int ohci_platform_power_on(struct platform_device *dev)
 49 {
 50         struct usb_hcd *hcd = platform_get_drvdata(dev);
 51         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 52         int clk, ret, phy_num;
 53 
 54         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
 55                 ret = clk_prepare_enable(priv->clks[clk]);
 56                 if (ret)
 57                         goto err_disable_clks;
 58         }
 59 
 60         for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
 61                 ret = phy_init(priv->phys[phy_num]);
 62                 if (ret)
 63                         goto err_exit_phy;
 64                 ret = phy_power_on(priv->phys[phy_num]);
 65                 if (ret) {
 66                         phy_exit(priv->phys[phy_num]);
 67                         goto err_exit_phy;
 68                 }
 69         }
 70 
 71         return 0;
 72 
 73 err_exit_phy:
 74         while (--phy_num >= 0) {
 75                 phy_power_off(priv->phys[phy_num]);
 76                 phy_exit(priv->phys[phy_num]);
 77         }
 78 err_disable_clks:
 79         while (--clk >= 0)
 80                 clk_disable_unprepare(priv->clks[clk]);
 81 
 82         return ret;
 83 }
 84 
 85 static void ohci_platform_power_off(struct platform_device *dev)
 86 {
 87         struct usb_hcd *hcd = platform_get_drvdata(dev);
 88         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 89         int clk, phy_num;
 90 
 91         for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
 92                 phy_power_off(priv->phys[phy_num]);
 93                 phy_exit(priv->phys[phy_num]);
 94         }
 95 
 96         for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
 97                 if (priv->clks[clk])
 98                         clk_disable_unprepare(priv->clks[clk]);
 99 }
100 
101 static struct hc_driver __read_mostly ohci_platform_hc_driver;
102 
103 static const struct ohci_driver_overrides platform_overrides __initconst = {
104         .product_desc =         "Generic Platform OHCI controller",
105         .extra_priv_size =      sizeof(struct ohci_platform_priv),
106 };
107 
108 static struct usb_ohci_pdata ohci_platform_defaults = {
109         .power_on =             ohci_platform_power_on,
110         .power_suspend =        ohci_platform_power_off,
111         .power_off =            ohci_platform_power_off,
112 };
113 
114 static int ohci_platform_probe(struct platform_device *dev)
115 {
116         struct usb_hcd *hcd;
117         struct resource *res_mem;
118         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
119         struct ohci_platform_priv *priv;
120         struct ohci_hcd *ohci;
121         int err, irq, phy_num, clk = 0, rst = 0;
122 
123         if (usb_disabled())
124                 return -ENODEV;
125 
126         /*
127          * Use reasonable defaults so platforms don't have to provide these
128          * with DT probing on ARM.
129          */
130         if (!pdata)
131                 pdata = &ohci_platform_defaults;
132 
133         err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
134         if (err)
135                 return err;
136 
137         irq = platform_get_irq(dev, 0);
138         if (irq < 0) {
139                 dev_err(&dev->dev, "no irq provided");
140                 return irq;
141         }
142 
143         hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
144                         dev_name(&dev->dev));
145         if (!hcd)
146                 return -ENOMEM;
147 
148         platform_set_drvdata(dev, hcd);
149         dev->dev.platform_data = pdata;
150         priv = hcd_to_ohci_priv(hcd);
151         ohci = hcd_to_ohci(hcd);
152 
153         if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
154                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
155                         ohci->flags |= OHCI_QUIRK_BE_MMIO;
156 
157                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
158                         ohci->flags |= OHCI_QUIRK_BE_DESC;
159 
160                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
161                         ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
162 
163                 if (of_property_read_bool(dev->dev.of_node, "no-big-frame-no"))
164                         ohci->flags |= OHCI_QUIRK_FRAME_NO;
165 
166                 of_property_read_u32(dev->dev.of_node, "num-ports",
167                                      &ohci->num_ports);
168 
169                 priv->num_phys = of_count_phandle_with_args(dev->dev.of_node,
170                                 "phys", "#phy-cells");
171 
172                 if (priv->num_phys > 0) {
173                         priv->phys = devm_kcalloc(&dev->dev, priv->num_phys,
174                                             sizeof(struct phy *), GFP_KERNEL);
175                         if (!priv->phys)
176                                 return -ENOMEM;
177                 } else
178                         priv->num_phys = 0;
179 
180                 for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
181                         priv->phys[phy_num] = devm_of_phy_get_by_index(
182                                         &dev->dev, dev->dev.of_node, phy_num);
183                         if (IS_ERR(priv->phys[phy_num])) {
184                                 err = PTR_ERR(priv->phys[phy_num]);
185                                 goto err_put_hcd;
186                         }
187                 }
188 
189                 for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
190                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
191                         if (IS_ERR(priv->clks[clk])) {
192                                 err = PTR_ERR(priv->clks[clk]);
193                                 if (err == -EPROBE_DEFER)
194                                         goto err_put_clks;
195                                 priv->clks[clk] = NULL;
196                                 break;
197                         }
198                 }
199                 for (rst = 0; rst < OHCI_MAX_RESETS; rst++) {
200                         priv->resets[rst] =
201                                 devm_reset_control_get_shared_by_index(
202                                                                 &dev->dev, rst);
203                         if (IS_ERR(priv->resets[rst])) {
204                                 err = PTR_ERR(priv->resets[rst]);
205                                 if (err == -EPROBE_DEFER)
206                                         goto err_reset;
207                                 priv->resets[rst] = NULL;
208                                 break;
209                         }
210                         err = reset_control_deassert(priv->resets[rst]);
211                         if (err)
212                                 goto err_reset;
213                 }
214         }
215 
216         if (pdata->big_endian_desc)
217                 ohci->flags |= OHCI_QUIRK_BE_DESC;
218         if (pdata->big_endian_mmio)
219                 ohci->flags |= OHCI_QUIRK_BE_MMIO;
220         if (pdata->no_big_frame_no)
221                 ohci->flags |= OHCI_QUIRK_FRAME_NO;
222         if (pdata->num_ports)
223                 ohci->num_ports = pdata->num_ports;
224 
225 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
226         if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
227                 dev_err(&dev->dev,
228                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
229                 err = -EINVAL;
230                 goto err_reset;
231         }
232 #endif
233 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
234         if (ohci->flags & OHCI_QUIRK_BE_DESC) {
235                 dev_err(&dev->dev,
236                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n");
237                 err = -EINVAL;
238                 goto err_reset;
239         }
240 #endif
241 
242         if (pdata->power_on) {
243                 err = pdata->power_on(dev);
244                 if (err < 0)
245                         goto err_reset;
246         }
247 
248         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
249         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
250         if (IS_ERR(hcd->regs)) {
251                 err = PTR_ERR(hcd->regs);
252                 goto err_power;
253         }
254         hcd->rsrc_start = res_mem->start;
255         hcd->rsrc_len = resource_size(res_mem);
256 
257         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
258         if (err)
259                 goto err_power;
260 
261         device_wakeup_enable(hcd->self.controller);
262 
263         platform_set_drvdata(dev, hcd);
264 
265         return err;
266 
267 err_power:
268         if (pdata->power_off)
269                 pdata->power_off(dev);
270 err_reset:
271         while (--rst >= 0)
272                 reset_control_assert(priv->resets[rst]);
273 err_put_clks:
274         while (--clk >= 0)
275                 clk_put(priv->clks[clk]);
276 err_put_hcd:
277         if (pdata == &ohci_platform_defaults)
278                 dev->dev.platform_data = NULL;
279 
280         usb_put_hcd(hcd);
281 
282         return err;
283 }
284 
285 static int ohci_platform_remove(struct platform_device *dev)
286 {
287         struct usb_hcd *hcd = platform_get_drvdata(dev);
288         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
289         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
290         int clk, rst;
291 
292         usb_remove_hcd(hcd);
293 
294         if (pdata->power_off)
295                 pdata->power_off(dev);
296 
297         for (rst = 0; rst < OHCI_MAX_RESETS && priv->resets[rst]; rst++)
298                 reset_control_assert(priv->resets[rst]);
299 
300         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
301                 clk_put(priv->clks[clk]);
302 
303         usb_put_hcd(hcd);
304 
305         if (pdata == &ohci_platform_defaults)
306                 dev->dev.platform_data = NULL;
307 
308         return 0;
309 }
310 
311 #ifdef CONFIG_PM_SLEEP
312 static int ohci_platform_suspend(struct device *dev)
313 {
314         struct usb_hcd *hcd = dev_get_drvdata(dev);
315         struct usb_ohci_pdata *pdata = dev->platform_data;
316         struct platform_device *pdev = to_platform_device(dev);
317         bool do_wakeup = device_may_wakeup(dev);
318         int ret;
319 
320         ret = ohci_suspend(hcd, do_wakeup);
321         if (ret)
322                 return ret;
323 
324         if (pdata->power_suspend)
325                 pdata->power_suspend(pdev);
326 
327         return ret;
328 }
329 
330 static int ohci_platform_resume(struct device *dev)
331 {
332         struct usb_hcd *hcd = dev_get_drvdata(dev);
333         struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
334         struct platform_device *pdev = to_platform_device(dev);
335 
336         if (pdata->power_on) {
337                 int err = pdata->power_on(pdev);
338                 if (err < 0)
339                         return err;
340         }
341 
342         ohci_resume(hcd, false);
343         return 0;
344 }
345 #endif /* CONFIG_PM_SLEEP */
346 
347 static const struct of_device_id ohci_platform_ids[] = {
348         { .compatible = "generic-ohci", },
349         { .compatible = "cavium,octeon-6335-ohci", },
350         { }
351 };
352 MODULE_DEVICE_TABLE(of, ohci_platform_ids);
353 
354 static const struct platform_device_id ohci_platform_table[] = {
355         { "ohci-platform", 0 },
356         { }
357 };
358 MODULE_DEVICE_TABLE(platform, ohci_platform_table);
359 
360 static SIMPLE_DEV_PM_OPS(ohci_platform_pm_ops, ohci_platform_suspend,
361         ohci_platform_resume);
362 
363 static struct platform_driver ohci_platform_driver = {
364         .id_table       = ohci_platform_table,
365         .probe          = ohci_platform_probe,
366         .remove         = ohci_platform_remove,
367         .shutdown       = usb_hcd_platform_shutdown,
368         .driver         = {
369                 .name   = "ohci-platform",
370                 .pm     = &ohci_platform_pm_ops,
371                 .of_match_table = ohci_platform_ids,
372         }
373 };
374 
375 static int __init ohci_platform_init(void)
376 {
377         if (usb_disabled())
378                 return -ENODEV;
379 
380         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
381 
382         ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
383         return platform_driver_register(&ohci_platform_driver);
384 }
385 module_init(ohci_platform_init);
386 
387 static void __exit ohci_platform_cleanup(void)
388 {
389         platform_driver_unregister(&ohci_platform_driver);
390 }
391 module_exit(ohci_platform_cleanup);
392 
393 MODULE_DESCRIPTION(DRIVER_DESC);
394 MODULE_AUTHOR("Hauke Mehrtens");
395 MODULE_AUTHOR("Alan Stern");
396 MODULE_LICENSE("GPL");
397 

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