Version:  2.0.40 2.2.26 2.4.37 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 3.19

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                 if (IS_ERR(phy)) {
 67                         ret = PTR_ERR(phy);
 68                         if (ret == -EPROBE_DEFER) {
 69                                 return ret;
 70                         } else if (ret != -ENOSYS && ret != -ENODEV) {
 71                                 dev_err(dev,
 72                                         "Error retrieving usb2 phy: %d\n", ret);
 73                                 return ret;
 74                         }
 75                 }
 76         }
 77 
 78         return 0;
 79 }
 80 
 81 static int exynos_ohci_phy_enable(struct device *dev)
 82 {
 83         struct usb_hcd *hcd = dev_get_drvdata(dev);
 84         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 85         int i;
 86         int ret = 0;
 87 
 88         for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
 89                 if (!IS_ERR(exynos_ohci->phy[i]))
 90                         ret = phy_power_on(exynos_ohci->phy[i]);
 91         if (ret)
 92                 for (i--; i >= 0; i--)
 93                         if (!IS_ERR(exynos_ohci->phy[i]))
 94                                 phy_power_off(exynos_ohci->phy[i]);
 95 
 96         return ret;
 97 }
 98 
 99 static void exynos_ohci_phy_disable(struct device *dev)
100 {
101         struct usb_hcd *hcd = dev_get_drvdata(dev);
102         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
103         int i;
104 
105         for (i = 0; i < PHY_NUMBER; i++)
106                 if (!IS_ERR(exynos_ohci->phy[i]))
107                         phy_power_off(exynos_ohci->phy[i]);
108 }
109 
110 static int exynos_ohci_probe(struct platform_device *pdev)
111 {
112         struct exynos_ohci_hcd *exynos_ohci;
113         struct usb_hcd *hcd;
114         struct resource *res;
115         int irq;
116         int err;
117 
118         /*
119          * Right now device-tree probed devices don't get dma_mask set.
120          * Since shared usb code relies on it, set it here for now.
121          * Once we move to full device tree support this will vanish off.
122          */
123         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
124         if (err)
125                 return err;
126 
127         hcd = usb_create_hcd(&exynos_ohci_hc_driver,
128                                 &pdev->dev, dev_name(&pdev->dev));
129         if (!hcd) {
130                 dev_err(&pdev->dev, "Unable to create HCD\n");
131                 return -ENOMEM;
132         }
133 
134         exynos_ohci = to_exynos_ohci(hcd);
135 
136         if (of_device_is_compatible(pdev->dev.of_node,
137                                         "samsung,exynos5440-ohci"))
138                 goto skip_phy;
139 
140         err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
141         if (err)
142                 goto fail_clk;
143 
144 skip_phy:
145         exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
146 
147         if (IS_ERR(exynos_ohci->clk)) {
148                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
149                 err = PTR_ERR(exynos_ohci->clk);
150                 goto fail_clk;
151         }
152 
153         err = clk_prepare_enable(exynos_ohci->clk);
154         if (err)
155                 goto fail_clk;
156 
157         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
158         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
159         if (IS_ERR(hcd->regs)) {
160                 err = PTR_ERR(hcd->regs);
161                 goto fail_io;
162         }
163         hcd->rsrc_start = res->start;
164         hcd->rsrc_len = resource_size(res);
165 
166         irq = platform_get_irq(pdev, 0);
167         if (!irq) {
168                 dev_err(&pdev->dev, "Failed to get IRQ\n");
169                 err = -ENODEV;
170                 goto fail_io;
171         }
172 
173         platform_set_drvdata(pdev, hcd);
174 
175         err = exynos_ohci_phy_enable(&pdev->dev);
176         if (err) {
177                 dev_err(&pdev->dev, "Failed to enable USB phy\n");
178                 goto fail_io;
179         }
180 
181         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
182         if (err) {
183                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
184                 goto fail_add_hcd;
185         }
186         device_wakeup_enable(hcd->self.controller);
187         return 0;
188 
189 fail_add_hcd:
190         exynos_ohci_phy_disable(&pdev->dev);
191 fail_io:
192         clk_disable_unprepare(exynos_ohci->clk);
193 fail_clk:
194         usb_put_hcd(hcd);
195         return err;
196 }
197 
198 static int exynos_ohci_remove(struct platform_device *pdev)
199 {
200         struct usb_hcd *hcd = platform_get_drvdata(pdev);
201         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
202 
203         usb_remove_hcd(hcd);
204 
205         exynos_ohci_phy_disable(&pdev->dev);
206 
207         clk_disable_unprepare(exynos_ohci->clk);
208 
209         usb_put_hcd(hcd);
210 
211         return 0;
212 }
213 
214 static void exynos_ohci_shutdown(struct platform_device *pdev)
215 {
216         struct usb_hcd *hcd = platform_get_drvdata(pdev);
217 
218         if (hcd->driver->shutdown)
219                 hcd->driver->shutdown(hcd);
220 }
221 
222 #ifdef CONFIG_PM
223 static int exynos_ohci_suspend(struct device *dev)
224 {
225         struct usb_hcd *hcd = dev_get_drvdata(dev);
226         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
227         bool do_wakeup = device_may_wakeup(dev);
228         int rc = ohci_suspend(hcd, do_wakeup);
229 
230         if (rc)
231                 return rc;
232 
233         exynos_ohci_phy_disable(dev);
234 
235         clk_disable_unprepare(exynos_ohci->clk);
236 
237         return 0;
238 }
239 
240 static int exynos_ohci_resume(struct device *dev)
241 {
242         struct usb_hcd *hcd                     = dev_get_drvdata(dev);
243         struct exynos_ohci_hcd *exynos_ohci     = to_exynos_ohci(hcd);
244         int ret;
245 
246         clk_prepare_enable(exynos_ohci->clk);
247 
248         ret = exynos_ohci_phy_enable(dev);
249         if (ret) {
250                 dev_err(dev, "Failed to enable USB phy\n");
251                 clk_disable_unprepare(exynos_ohci->clk);
252                 return ret;
253         }
254 
255         ohci_resume(hcd, false);
256 
257         return 0;
258 }
259 #else
260 #define exynos_ohci_suspend     NULL
261 #define exynos_ohci_resume      NULL
262 #endif
263 
264 static const struct ohci_driver_overrides exynos_overrides __initconst = {
265         .extra_priv_size =      sizeof(struct exynos_ohci_hcd),
266 };
267 
268 static const struct dev_pm_ops exynos_ohci_pm_ops = {
269         .suspend        = exynos_ohci_suspend,
270         .resume         = exynos_ohci_resume,
271 };
272 
273 #ifdef CONFIG_OF
274 static const struct of_device_id exynos_ohci_match[] = {
275         { .compatible = "samsung,exynos4210-ohci" },
276         { .compatible = "samsung,exynos5440-ohci" },
277         {},
278 };
279 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
280 #endif
281 
282 static struct platform_driver exynos_ohci_driver = {
283         .probe          = exynos_ohci_probe,
284         .remove         = exynos_ohci_remove,
285         .shutdown       = exynos_ohci_shutdown,
286         .driver = {
287                 .name   = "exynos-ohci",
288                 .pm     = &exynos_ohci_pm_ops,
289                 .of_match_table = of_match_ptr(exynos_ohci_match),
290         }
291 };
292 static int __init ohci_exynos_init(void)
293 {
294         if (usb_disabled())
295                 return -ENODEV;
296 
297         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
298         ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
299         return platform_driver_register(&exynos_ohci_driver);
300 }
301 module_init(ohci_exynos_init);
302 
303 static void __exit ohci_exynos_cleanup(void)
304 {
305         platform_driver_unregister(&exynos_ohci_driver);
306 }
307 module_exit(ohci_exynos_cleanup);
308 
309 MODULE_ALIAS("platform:exynos-ohci");
310 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
311 MODULE_LICENSE("GPL v2");
312 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us