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/phy/phy.h>
22 #include <linux/usb.h>
23 #include <linux/usb/hcd.h>
27 #define DRIVER_DESC "OHCI EXYNOS driver"
29 static const char hcd_name[] = "ohci-exynos";
30 static struct hc_driver __read_mostly exynos_ohci_hc_driver;
32 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
36 struct exynos_ohci_hcd {
38 struct phy *phy[PHY_NUMBER];
41 static int exynos_ohci_get_phy(struct device *dev,
42 struct exynos_ohci_hcd *exynos_ohci)
44 struct device_node *child;
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);
53 dev_err(dev, "Failed to parse device tree\n");
58 if (phy_number >= PHY_NUMBER) {
59 dev_err(dev, "Invalid number of PHYs\n");
64 phy = devm_of_phy_get(dev, child, NULL);
65 exynos_ohci->phy[phy_number] = phy;
68 if (ret == -EPROBE_DEFER) {
71 } else if (ret != -ENOSYS && ret != -ENODEV) {
73 "Error retrieving usb2 phy: %d\n", ret);
83 static int exynos_ohci_phy_enable(struct device *dev)
85 struct usb_hcd *hcd = dev_get_drvdata(dev);
86 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
90 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
91 if (!IS_ERR(exynos_ohci->phy[i]))
92 ret = phy_power_on(exynos_ohci->phy[i]);
94 for (i--; i >= 0; i--)
95 if (!IS_ERR(exynos_ohci->phy[i]))
96 phy_power_off(exynos_ohci->phy[i]);
101 static void exynos_ohci_phy_disable(struct device *dev)
103 struct usb_hcd *hcd = dev_get_drvdata(dev);
104 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
107 for (i = 0; i < PHY_NUMBER; i++)
108 if (!IS_ERR(exynos_ohci->phy[i]))
109 phy_power_off(exynos_ohci->phy[i]);
112 static int exynos_ohci_probe(struct platform_device *pdev)
114 struct exynos_ohci_hcd *exynos_ohci;
116 struct resource *res;
121 * Right now device-tree probed devices don't get dma_mask set.
122 * Since shared usb code relies on it, set it here for now.
123 * Once we move to full device tree support this will vanish off.
125 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
129 hcd = usb_create_hcd(&exynos_ohci_hc_driver,
130 &pdev->dev, dev_name(&pdev->dev));
132 dev_err(&pdev->dev, "Unable to create HCD\n");
136 exynos_ohci = to_exynos_ohci(hcd);
138 if (of_device_is_compatible(pdev->dev.of_node,
139 "samsung,exynos5440-ohci"))
142 err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
147 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
149 if (IS_ERR(exynos_ohci->clk)) {
150 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
151 err = PTR_ERR(exynos_ohci->clk);
155 err = clk_prepare_enable(exynos_ohci->clk);
159 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
160 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
161 if (IS_ERR(hcd->regs)) {
162 err = PTR_ERR(hcd->regs);
165 hcd->rsrc_start = res->start;
166 hcd->rsrc_len = resource_size(res);
168 irq = platform_get_irq(pdev, 0);
174 platform_set_drvdata(pdev, hcd);
176 err = exynos_ohci_phy_enable(&pdev->dev);
178 dev_err(&pdev->dev, "Failed to enable USB phy\n");
182 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
184 dev_err(&pdev->dev, "Failed to add USB HCD\n");
187 device_wakeup_enable(hcd->self.controller);
191 exynos_ohci_phy_disable(&pdev->dev);
193 clk_disable_unprepare(exynos_ohci->clk);
199 static int exynos_ohci_remove(struct platform_device *pdev)
201 struct usb_hcd *hcd = platform_get_drvdata(pdev);
202 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
206 exynos_ohci_phy_disable(&pdev->dev);
208 clk_disable_unprepare(exynos_ohci->clk);
215 static void exynos_ohci_shutdown(struct platform_device *pdev)
217 struct usb_hcd *hcd = platform_get_drvdata(pdev);
219 if (hcd->driver->shutdown)
220 hcd->driver->shutdown(hcd);
224 static int exynos_ohci_suspend(struct device *dev)
226 struct usb_hcd *hcd = dev_get_drvdata(dev);
227 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
228 bool do_wakeup = device_may_wakeup(dev);
229 int rc = ohci_suspend(hcd, do_wakeup);
234 exynos_ohci_phy_disable(dev);
236 clk_disable_unprepare(exynos_ohci->clk);
241 static int exynos_ohci_resume(struct device *dev)
243 struct usb_hcd *hcd = dev_get_drvdata(dev);
244 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
247 clk_prepare_enable(exynos_ohci->clk);
249 ret = exynos_ohci_phy_enable(dev);
251 dev_err(dev, "Failed to enable USB phy\n");
252 clk_disable_unprepare(exynos_ohci->clk);
256 ohci_resume(hcd, false);
261 #define exynos_ohci_suspend NULL
262 #define exynos_ohci_resume NULL
265 static const struct ohci_driver_overrides exynos_overrides __initconst = {
266 .extra_priv_size = sizeof(struct exynos_ohci_hcd),
269 static const struct dev_pm_ops exynos_ohci_pm_ops = {
270 .suspend = exynos_ohci_suspend,
271 .resume = exynos_ohci_resume,
275 static const struct of_device_id exynos_ohci_match[] = {
276 { .compatible = "samsung,exynos4210-ohci" },
277 { .compatible = "samsung,exynos5440-ohci" },
280 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
283 static struct platform_driver exynos_ohci_driver = {
284 .probe = exynos_ohci_probe,
285 .remove = exynos_ohci_remove,
286 .shutdown = exynos_ohci_shutdown,
288 .name = "exynos-ohci",
289 .pm = &exynos_ohci_pm_ops,
290 .of_match_table = of_match_ptr(exynos_ohci_match),
293 static int __init ohci_exynos_init(void)
298 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
299 ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
300 return platform_driver_register(&exynos_ohci_driver);
302 module_init(ohci_exynos_init);
304 static void __exit ohci_exynos_cleanup(void)
306 platform_driver_unregister(&exynos_ohci_driver);
308 module_exit(ohci_exynos_cleanup);
310 MODULE_ALIAS("platform:exynos-ohci");
311 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
312 MODULE_LICENSE("GPL v2");