Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

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

  1 /*
  2  * SAMSUNG EXYNOS USB HOST OHCI Controller
  3  *
  4  * Copyright (C) 2011 Samsung Electronics Co.Ltd
  5  * Author: Jingoo Han <jg1.han@samsung.com>
  6  *
  7  * This program is free software; you can redistribute  it and/or modify it
  8  * under  the terms of  the GNU General  Public License as published by the
  9  * Free Software Foundation;  either version 2 of the  License, or (at your
 10  * option) any later version.
 11  *
 12  */
 13 
 14 #include <linux/clk.h>
 15 #include <linux/dma-mapping.h>
 16 #include <linux/io.h>
 17 #include <linux/kernel.h>
 18 #include <linux/module.h>
 19 #include <linux/of.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/phy/phy.h>
 22 #include <linux/usb.h>
 23 #include <linux/usb/hcd.h>
 24 
 25 #include "ohci.h"
 26 
 27 #define DRIVER_DESC "OHCI EXYNOS driver"
 28 
 29 static const char hcd_name[] = "ohci-exynos";
 30 static struct hc_driver __read_mostly exynos_ohci_hc_driver;
 31 
 32 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
 33 
 34 #define PHY_NUMBER 3
 35 
 36 struct exynos_ohci_hcd {
 37         struct clk *clk;
 38         struct phy *phy[PHY_NUMBER];
 39 };
 40 
 41 static int exynos_ohci_get_phy(struct device *dev,
 42                                 struct exynos_ohci_hcd *exynos_ohci)
 43 {
 44         struct device_node *child;
 45         struct phy *phy;
 46         int phy_number;
 47         int ret;
 48 
 49         /* Get PHYs for the controller */
 50         for_each_available_child_of_node(dev->of_node, child) {
 51                 ret = of_property_read_u32(child, "reg", &phy_number);
 52                 if (ret) {
 53                         dev_err(dev, "Failed to parse device tree\n");
 54                         of_node_put(child);
 55                         return ret;
 56                 }
 57 
 58                 if (phy_number >= PHY_NUMBER) {
 59                         dev_err(dev, "Invalid number of PHYs\n");
 60                         of_node_put(child);
 61                         return -EINVAL;
 62                 }
 63 
 64                 phy = devm_of_phy_get(dev, child, NULL);
 65                 exynos_ohci->phy[phy_number] = phy;
 66                 of_node_put(child);
 67                 if (IS_ERR(phy)) {
 68                         ret = PTR_ERR(phy);
 69                         if (ret == -EPROBE_DEFER) {
 70                                 return ret;
 71                         } else if (ret != -ENOSYS && ret != -ENODEV) {
 72                                 dev_err(dev,
 73                                         "Error retrieving usb2 phy: %d\n", ret);
 74                                 return ret;
 75                         }
 76                 }
 77         }
 78 
 79         return 0;
 80 }
 81 
 82 static int exynos_ohci_phy_enable(struct device *dev)
 83 {
 84         struct usb_hcd *hcd = dev_get_drvdata(dev);
 85         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 86         int i;
 87         int ret = 0;
 88 
 89         for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
 90                 if (!IS_ERR(exynos_ohci->phy[i]))
 91                         ret = phy_power_on(exynos_ohci->phy[i]);
 92         if (ret)
 93                 for (i--; i >= 0; i--)
 94                         if (!IS_ERR(exynos_ohci->phy[i]))
 95                                 phy_power_off(exynos_ohci->phy[i]);
 96 
 97         return ret;
 98 }
 99 
100 static void exynos_ohci_phy_disable(struct device *dev)
101 {
102         struct usb_hcd *hcd = dev_get_drvdata(dev);
103         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
104         int i;
105 
106         for (i = 0; i < PHY_NUMBER; i++)
107                 if (!IS_ERR(exynos_ohci->phy[i]))
108                         phy_power_off(exynos_ohci->phy[i]);
109 }
110 
111 static int exynos_ohci_probe(struct platform_device *pdev)
112 {
113         struct exynos_ohci_hcd *exynos_ohci;
114         struct usb_hcd *hcd;
115         struct resource *res;
116         int irq;
117         int err;
118 
119         /*
120          * Right now device-tree probed devices don't get dma_mask set.
121          * Since shared usb code relies on it, set it here for now.
122          * Once we move to full device tree support this will vanish off.
123          */
124         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
125         if (err)
126                 return err;
127 
128         hcd = usb_create_hcd(&exynos_ohci_hc_driver,
129                                 &pdev->dev, dev_name(&pdev->dev));
130         if (!hcd) {
131                 dev_err(&pdev->dev, "Unable to create HCD\n");
132                 return -ENOMEM;
133         }
134 
135         exynos_ohci = to_exynos_ohci(hcd);
136 
137         if (of_device_is_compatible(pdev->dev.of_node,
138                                         "samsung,exynos5440-ohci"))
139                 goto skip_phy;
140 
141         err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
142         if (err)
143                 goto fail_clk;
144 
145 skip_phy:
146         exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
147 
148         if (IS_ERR(exynos_ohci->clk)) {
149                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
150                 err = PTR_ERR(exynos_ohci->clk);
151                 goto fail_clk;
152         }
153 
154         err = clk_prepare_enable(exynos_ohci->clk);
155         if (err)
156                 goto fail_clk;
157 
158         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
159         if (!res) {
160                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
161                 err = -ENXIO;
162                 goto fail_io;
163         }
164 
165         hcd->rsrc_start = res->start;
166         hcd->rsrc_len = resource_size(res);
167         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
168         if (IS_ERR(hcd->regs)) {
169                 err = PTR_ERR(hcd->regs);
170                 goto fail_io;
171         }
172 
173         irq = platform_get_irq(pdev, 0);
174         if (!irq) {
175                 dev_err(&pdev->dev, "Failed to get IRQ\n");
176                 err = -ENODEV;
177                 goto fail_io;
178         }
179 
180         platform_set_drvdata(pdev, hcd);
181 
182         err = exynos_ohci_phy_enable(&pdev->dev);
183         if (err) {
184                 dev_err(&pdev->dev, "Failed to enable USB phy\n");
185                 goto fail_io;
186         }
187 
188         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
189         if (err) {
190                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
191                 goto fail_add_hcd;
192         }
193         device_wakeup_enable(hcd->self.controller);
194         return 0;
195 
196 fail_add_hcd:
197         exynos_ohci_phy_disable(&pdev->dev);
198 fail_io:
199         clk_disable_unprepare(exynos_ohci->clk);
200 fail_clk:
201         usb_put_hcd(hcd);
202         return err;
203 }
204 
205 static int exynos_ohci_remove(struct platform_device *pdev)
206 {
207         struct usb_hcd *hcd = platform_get_drvdata(pdev);
208         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
209 
210         usb_remove_hcd(hcd);
211 
212         exynos_ohci_phy_disable(&pdev->dev);
213 
214         clk_disable_unprepare(exynos_ohci->clk);
215 
216         usb_put_hcd(hcd);
217 
218         return 0;
219 }
220 
221 static void exynos_ohci_shutdown(struct platform_device *pdev)
222 {
223         struct usb_hcd *hcd = platform_get_drvdata(pdev);
224 
225         if (hcd->driver->shutdown)
226                 hcd->driver->shutdown(hcd);
227 }
228 
229 #ifdef CONFIG_PM
230 static int exynos_ohci_suspend(struct device *dev)
231 {
232         struct usb_hcd *hcd = dev_get_drvdata(dev);
233         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
234         bool do_wakeup = device_may_wakeup(dev);
235         int rc = ohci_suspend(hcd, do_wakeup);
236 
237         if (rc)
238                 return rc;
239 
240         exynos_ohci_phy_disable(dev);
241 
242         clk_disable_unprepare(exynos_ohci->clk);
243 
244         return 0;
245 }
246 
247 static int exynos_ohci_resume(struct device *dev)
248 {
249         struct usb_hcd *hcd                     = dev_get_drvdata(dev);
250         struct exynos_ohci_hcd *exynos_ohci     = to_exynos_ohci(hcd);
251         int ret;
252 
253         clk_prepare_enable(exynos_ohci->clk);
254 
255         ret = exynos_ohci_phy_enable(dev);
256         if (ret) {
257                 dev_err(dev, "Failed to enable USB phy\n");
258                 clk_disable_unprepare(exynos_ohci->clk);
259                 return ret;
260         }
261 
262         ohci_resume(hcd, false);
263 
264         return 0;
265 }
266 #else
267 #define exynos_ohci_suspend     NULL
268 #define exynos_ohci_resume      NULL
269 #endif
270 
271 static const struct ohci_driver_overrides exynos_overrides __initconst = {
272         .extra_priv_size =      sizeof(struct exynos_ohci_hcd),
273 };
274 
275 static const struct dev_pm_ops exynos_ohci_pm_ops = {
276         .suspend        = exynos_ohci_suspend,
277         .resume         = exynos_ohci_resume,
278 };
279 
280 #ifdef CONFIG_OF
281 static const struct of_device_id exynos_ohci_match[] = {
282         { .compatible = "samsung,exynos4210-ohci" },
283         { .compatible = "samsung,exynos5440-ohci" },
284         {},
285 };
286 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
287 #endif
288 
289 static struct platform_driver exynos_ohci_driver = {
290         .probe          = exynos_ohci_probe,
291         .remove         = exynos_ohci_remove,
292         .shutdown       = exynos_ohci_shutdown,
293         .driver = {
294                 .name   = "exynos-ohci",
295                 .owner  = THIS_MODULE,
296                 .pm     = &exynos_ohci_pm_ops,
297                 .of_match_table = of_match_ptr(exynos_ohci_match),
298         }
299 };
300 static int __init ohci_exynos_init(void)
301 {
302         if (usb_disabled())
303                 return -ENODEV;
304 
305         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
306         ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
307         return platform_driver_register(&exynos_ohci_driver);
308 }
309 module_init(ohci_exynos_init);
310 
311 static void __exit ohci_exynos_cleanup(void)
312 {
313         platform_driver_unregister(&exynos_ohci_driver);
314 }
315 module_exit(ohci_exynos_cleanup);
316 
317 MODULE_ALIAS("platform:exynos-ohci");
318 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
319 MODULE_LICENSE("GPL v2");
320 

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