Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 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

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/usb/phy.h>
 22 #include <linux/usb/samsung_usb_phy.h>
 23 #include <linux/usb.h>
 24 #include <linux/usb/hcd.h>
 25 #include <linux/usb/otg.h>
 26 
 27 #include "ohci.h"
 28 
 29 #define DRIVER_DESC "OHCI EXYNOS driver"
 30 
 31 static const char hcd_name[] = "ohci-exynos";
 32 static struct hc_driver __read_mostly exynos_ohci_hc_driver;
 33 
 34 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
 35 
 36 struct exynos_ohci_hcd {
 37         struct clk *clk;
 38         struct usb_phy *phy;
 39         struct usb_otg *otg;
 40 };
 41 
 42 static void exynos_ohci_phy_enable(struct platform_device *pdev)
 43 {
 44         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 45         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 46 
 47         if (exynos_ohci->phy)
 48                 usb_phy_init(exynos_ohci->phy);
 49 }
 50 
 51 static void exynos_ohci_phy_disable(struct platform_device *pdev)
 52 {
 53         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 54         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 55 
 56         if (exynos_ohci->phy)
 57                 usb_phy_shutdown(exynos_ohci->phy);
 58 }
 59 
 60 static int exynos_ohci_probe(struct platform_device *pdev)
 61 {
 62         struct exynos_ohci_hcd *exynos_ohci;
 63         struct usb_hcd *hcd;
 64         struct resource *res;
 65         struct usb_phy *phy;
 66         int irq;
 67         int err;
 68 
 69         /*
 70          * Right now device-tree probed devices don't get dma_mask set.
 71          * Since shared usb code relies on it, set it here for now.
 72          * Once we move to full device tree support this will vanish off.
 73          */
 74         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 75         if (err)
 76                 return err;
 77 
 78         hcd = usb_create_hcd(&exynos_ohci_hc_driver,
 79                                 &pdev->dev, dev_name(&pdev->dev));
 80         if (!hcd) {
 81                 dev_err(&pdev->dev, "Unable to create HCD\n");
 82                 return -ENOMEM;
 83         }
 84 
 85         exynos_ohci = to_exynos_ohci(hcd);
 86 
 87         if (of_device_is_compatible(pdev->dev.of_node,
 88                                         "samsung,exynos5440-ohci"))
 89                 goto skip_phy;
 90 
 91         phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 92         if (IS_ERR(phy)) {
 93                 usb_put_hcd(hcd);
 94                 dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
 95                 return -EPROBE_DEFER;
 96         } else {
 97                 exynos_ohci->phy = phy;
 98                 exynos_ohci->otg = phy->otg;
 99         }
100 
101 skip_phy:
102         exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
103 
104         if (IS_ERR(exynos_ohci->clk)) {
105                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
106                 err = PTR_ERR(exynos_ohci->clk);
107                 goto fail_clk;
108         }
109 
110         err = clk_prepare_enable(exynos_ohci->clk);
111         if (err)
112                 goto fail_clk;
113 
114         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
115         if (!res) {
116                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
117                 err = -ENXIO;
118                 goto fail_io;
119         }
120 
121         hcd->rsrc_start = res->start;
122         hcd->rsrc_len = resource_size(res);
123         hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
124         if (!hcd->regs) {
125                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
126                 err = -ENOMEM;
127                 goto fail_io;
128         }
129 
130         irq = platform_get_irq(pdev, 0);
131         if (!irq) {
132                 dev_err(&pdev->dev, "Failed to get IRQ\n");
133                 err = -ENODEV;
134                 goto fail_io;
135         }
136 
137         if (exynos_ohci->otg)
138                 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
139 
140         platform_set_drvdata(pdev, hcd);
141 
142         exynos_ohci_phy_enable(pdev);
143 
144         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
145         if (err) {
146                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
147                 goto fail_add_hcd;
148         }
149         device_wakeup_enable(hcd->self.controller);
150         return 0;
151 
152 fail_add_hcd:
153         exynos_ohci_phy_disable(pdev);
154 fail_io:
155         clk_disable_unprepare(exynos_ohci->clk);
156 fail_clk:
157         usb_put_hcd(hcd);
158         return err;
159 }
160 
161 static int exynos_ohci_remove(struct platform_device *pdev)
162 {
163         struct usb_hcd *hcd = platform_get_drvdata(pdev);
164         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
165 
166         usb_remove_hcd(hcd);
167 
168         if (exynos_ohci->otg)
169                 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
170 
171         exynos_ohci_phy_disable(pdev);
172 
173         clk_disable_unprepare(exynos_ohci->clk);
174 
175         usb_put_hcd(hcd);
176 
177         return 0;
178 }
179 
180 static void exynos_ohci_shutdown(struct platform_device *pdev)
181 {
182         struct usb_hcd *hcd = platform_get_drvdata(pdev);
183 
184         if (hcd->driver->shutdown)
185                 hcd->driver->shutdown(hcd);
186 }
187 
188 #ifdef CONFIG_PM
189 static int exynos_ohci_suspend(struct device *dev)
190 {
191         struct usb_hcd *hcd = dev_get_drvdata(dev);
192         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
193         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
194         struct platform_device *pdev = to_platform_device(dev);
195         bool do_wakeup = device_may_wakeup(dev);
196         unsigned long flags;
197         int rc = ohci_suspend(hcd, do_wakeup);
198 
199         if (rc)
200                 return rc;
201 
202         spin_lock_irqsave(&ohci->lock, flags);
203 
204         if (exynos_ohci->otg)
205                 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
206 
207         exynos_ohci_phy_disable(pdev);
208 
209         clk_disable_unprepare(exynos_ohci->clk);
210 
211         spin_unlock_irqrestore(&ohci->lock, flags);
212 
213         return 0;
214 }
215 
216 static int exynos_ohci_resume(struct device *dev)
217 {
218         struct usb_hcd *hcd                     = dev_get_drvdata(dev);
219         struct exynos_ohci_hcd *exynos_ohci     = to_exynos_ohci(hcd);
220         struct platform_device *pdev            = to_platform_device(dev);
221 
222         clk_prepare_enable(exynos_ohci->clk);
223 
224         if (exynos_ohci->otg)
225                 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
226 
227         exynos_ohci_phy_enable(pdev);
228 
229         ohci_resume(hcd, false);
230 
231         return 0;
232 }
233 #else
234 #define exynos_ohci_suspend     NULL
235 #define exynos_ohci_resume      NULL
236 #endif
237 
238 static const struct ohci_driver_overrides exynos_overrides __initconst = {
239         .extra_priv_size =      sizeof(struct exynos_ohci_hcd),
240 };
241 
242 static const struct dev_pm_ops exynos_ohci_pm_ops = {
243         .suspend        = exynos_ohci_suspend,
244         .resume         = exynos_ohci_resume,
245 };
246 
247 #ifdef CONFIG_OF
248 static const struct of_device_id exynos_ohci_match[] = {
249         { .compatible = "samsung,exynos4210-ohci" },
250         { .compatible = "samsung,exynos5440-ohci" },
251         {},
252 };
253 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
254 #endif
255 
256 static struct platform_driver exynos_ohci_driver = {
257         .probe          = exynos_ohci_probe,
258         .remove         = exynos_ohci_remove,
259         .shutdown       = exynos_ohci_shutdown,
260         .driver = {
261                 .name   = "exynos-ohci",
262                 .owner  = THIS_MODULE,
263                 .pm     = &exynos_ohci_pm_ops,
264                 .of_match_table = of_match_ptr(exynos_ohci_match),
265         }
266 };
267 static int __init ohci_exynos_init(void)
268 {
269         if (usb_disabled())
270                 return -ENODEV;
271 
272         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
273         ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
274         return platform_driver_register(&exynos_ohci_driver);
275 }
276 module_init(ohci_exynos_init);
277 
278 static void __exit ohci_exynos_cleanup(void)
279 {
280         platform_driver_unregister(&exynos_ohci_driver);
281 }
282 module_exit(ohci_exynos_cleanup);
283 
284 MODULE_ALIAS("platform:exynos-ohci");
285 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
286 MODULE_LICENSE("GPL v2");
287 

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