2 * SAMSUNG EXYNOS USB HOST OHCI Controller
4 * Copyright (C) 2011 Samsung Electronics Co.Ltd
5 * Author: Jingoo Han <jg1.han@samsung.com>
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.
14 #include <linux/clk.h>
15 #include <linux/dma-mapping.h>
17 #include <linux/kernel.h>
18 #include <linux/module.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>
29 #define DRIVER_DESC "OHCI EXYNOS driver"
31 static const char hcd_name[] = "ohci-exynos";
32 static struct hc_driver __read_mostly exynos_ohci_hc_driver;
34 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
36 struct exynos_ohci_hcd {
42 static void exynos_ohci_phy_enable(struct platform_device *pdev)
44 struct usb_hcd *hcd = platform_get_drvdata(pdev);
45 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
48 usb_phy_init(exynos_ohci->phy);
51 static void exynos_ohci_phy_disable(struct platform_device *pdev)
53 struct usb_hcd *hcd = platform_get_drvdata(pdev);
54 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
57 usb_phy_shutdown(exynos_ohci->phy);
60 static int exynos_ohci_probe(struct platform_device *pdev)
62 struct exynos_ohci_hcd *exynos_ohci;
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.
74 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
78 hcd = usb_create_hcd(&exynos_ohci_hc_driver,
79 &pdev->dev, dev_name(&pdev->dev));
81 dev_err(&pdev->dev, "Unable to create HCD\n");
85 exynos_ohci = to_exynos_ohci(hcd);
87 if (of_device_is_compatible(pdev->dev.of_node,
88 "samsung,exynos5440-ohci"))
91 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
94 dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
97 exynos_ohci->phy = phy;
98 exynos_ohci->otg = phy->otg;
102 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
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);
110 err = clk_prepare_enable(exynos_ohci->clk);
114 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
116 dev_err(&pdev->dev, "Failed to get I/O memory\n");
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);
125 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
130 irq = platform_get_irq(pdev, 0);
132 dev_err(&pdev->dev, "Failed to get IRQ\n");
137 if (exynos_ohci->otg)
138 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
140 platform_set_drvdata(pdev, hcd);
142 exynos_ohci_phy_enable(pdev);
144 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
146 dev_err(&pdev->dev, "Failed to add USB HCD\n");
152 exynos_ohci_phy_disable(pdev);
154 clk_disable_unprepare(exynos_ohci->clk);
160 static int exynos_ohci_remove(struct platform_device *pdev)
162 struct usb_hcd *hcd = platform_get_drvdata(pdev);
163 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
167 if (exynos_ohci->otg)
168 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
170 exynos_ohci_phy_disable(pdev);
172 clk_disable_unprepare(exynos_ohci->clk);
179 static void exynos_ohci_shutdown(struct platform_device *pdev)
181 struct usb_hcd *hcd = platform_get_drvdata(pdev);
183 if (hcd->driver->shutdown)
184 hcd->driver->shutdown(hcd);
188 static int exynos_ohci_suspend(struct device *dev)
190 struct usb_hcd *hcd = dev_get_drvdata(dev);
191 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
192 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
193 struct platform_device *pdev = to_platform_device(dev);
194 bool do_wakeup = device_may_wakeup(dev);
196 int rc = ohci_suspend(hcd, do_wakeup);
201 spin_lock_irqsave(&ohci->lock, flags);
203 if (exynos_ohci->otg)
204 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
206 exynos_ohci_phy_disable(pdev);
208 clk_disable_unprepare(exynos_ohci->clk);
210 spin_unlock_irqrestore(&ohci->lock, flags);
215 static int exynos_ohci_resume(struct device *dev)
217 struct usb_hcd *hcd = dev_get_drvdata(dev);
218 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
219 struct platform_device *pdev = to_platform_device(dev);
221 clk_prepare_enable(exynos_ohci->clk);
223 if (exynos_ohci->otg)
224 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
226 exynos_ohci_phy_enable(pdev);
228 ohci_resume(hcd, false);
233 #define exynos_ohci_suspend NULL
234 #define exynos_ohci_resume NULL
237 static const struct ohci_driver_overrides exynos_overrides __initconst = {
238 .extra_priv_size = sizeof(struct exynos_ohci_hcd),
241 static const struct dev_pm_ops exynos_ohci_pm_ops = {
242 .suspend = exynos_ohci_suspend,
243 .resume = exynos_ohci_resume,
247 static const struct of_device_id exynos_ohci_match[] = {
248 { .compatible = "samsung,exynos4210-ohci" },
249 { .compatible = "samsung,exynos5440-ohci" },
252 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
255 static struct platform_driver exynos_ohci_driver = {
256 .probe = exynos_ohci_probe,
257 .remove = exynos_ohci_remove,
258 .shutdown = exynos_ohci_shutdown,
260 .name = "exynos-ohci",
261 .owner = THIS_MODULE,
262 .pm = &exynos_ohci_pm_ops,
263 .of_match_table = of_match_ptr(exynos_ohci_match),
266 static int __init ohci_exynos_init(void)
271 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
272 ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
273 return platform_driver_register(&exynos_ohci_driver);
275 module_init(ohci_exynos_init);
277 static void __exit ohci_exynos_cleanup(void)
279 platform_driver_unregister(&exynos_ohci_driver);
281 module_exit(ohci_exynos_cleanup);
283 MODULE_ALIAS("platform:exynos-ohci");
284 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
285 MODULE_LICENSE("GPL v2");