1 // SPDX-License-Identifier: GPL-2.0+
3 * SAMSUNG EXYNOS USB HOST OHCI Controller
5 * Copyright (C) 2011 Samsung Electronics Co.Ltd
6 * Author: Jingoo Han <jg1.han@samsung.com>
10 #include <linux/dma-mapping.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/phy/phy.h>
17 #include <linux/usb.h>
18 #include <linux/usb/hcd.h>
22 #define DRIVER_DESC "OHCI EXYNOS driver"
24 static const char hcd_name[] = "ohci-exynos";
25 static struct hc_driver __read_mostly exynos_ohci_hc_driver;
27 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
31 struct exynos_ohci_hcd {
33 struct phy *phy[PHY_NUMBER];
36 static int exynos_ohci_get_phy(struct device *dev,
37 struct exynos_ohci_hcd *exynos_ohci)
39 struct device_node *child;
44 /* Get PHYs for the controller */
45 for_each_available_child_of_node(dev->of_node, child) {
46 ret = of_property_read_u32(child, "reg", &phy_number);
48 dev_err(dev, "Failed to parse device tree\n");
53 if (phy_number >= PHY_NUMBER) {
54 dev_err(dev, "Invalid number of PHYs\n");
59 phy = devm_of_phy_get(dev, child, NULL);
60 exynos_ohci->phy[phy_number] = phy;
63 if (ret == -EPROBE_DEFER) {
66 } else if (ret != -ENOSYS && ret != -ENODEV) {
68 "Error retrieving usb2 phy: %d\n", ret);
78 static int exynos_ohci_phy_enable(struct device *dev)
80 struct usb_hcd *hcd = dev_get_drvdata(dev);
81 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
85 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
86 if (!IS_ERR(exynos_ohci->phy[i]))
87 ret = phy_power_on(exynos_ohci->phy[i]);
89 for (i--; i >= 0; i--)
90 if (!IS_ERR(exynos_ohci->phy[i]))
91 phy_power_off(exynos_ohci->phy[i]);
96 static void exynos_ohci_phy_disable(struct device *dev)
98 struct usb_hcd *hcd = dev_get_drvdata(dev);
99 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
102 for (i = 0; i < PHY_NUMBER; i++)
103 if (!IS_ERR(exynos_ohci->phy[i]))
104 phy_power_off(exynos_ohci->phy[i]);
107 static int exynos_ohci_probe(struct platform_device *pdev)
109 struct exynos_ohci_hcd *exynos_ohci;
111 struct resource *res;
116 * Right now device-tree probed devices don't get dma_mask set.
117 * Since shared usb code relies on it, set it here for now.
118 * Once we move to full device tree support this will vanish off.
120 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
124 hcd = usb_create_hcd(&exynos_ohci_hc_driver,
125 &pdev->dev, dev_name(&pdev->dev));
127 dev_err(&pdev->dev, "Unable to create HCD\n");
131 exynos_ohci = to_exynos_ohci(hcd);
133 err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
137 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
139 if (IS_ERR(exynos_ohci->clk)) {
140 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
141 err = PTR_ERR(exynos_ohci->clk);
145 err = clk_prepare_enable(exynos_ohci->clk);
149 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
150 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
151 if (IS_ERR(hcd->regs)) {
152 err = PTR_ERR(hcd->regs);
155 hcd->rsrc_start = res->start;
156 hcd->rsrc_len = resource_size(res);
158 irq = platform_get_irq(pdev, 0);
164 platform_set_drvdata(pdev, hcd);
166 err = exynos_ohci_phy_enable(&pdev->dev);
168 dev_err(&pdev->dev, "Failed to enable USB phy\n");
172 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
174 dev_err(&pdev->dev, "Failed to add USB HCD\n");
177 device_wakeup_enable(hcd->self.controller);
181 exynos_ohci_phy_disable(&pdev->dev);
183 clk_disable_unprepare(exynos_ohci->clk);
189 static int exynos_ohci_remove(struct platform_device *pdev)
191 struct usb_hcd *hcd = platform_get_drvdata(pdev);
192 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
196 exynos_ohci_phy_disable(&pdev->dev);
198 clk_disable_unprepare(exynos_ohci->clk);
205 static void exynos_ohci_shutdown(struct platform_device *pdev)
207 struct usb_hcd *hcd = platform_get_drvdata(pdev);
209 if (hcd->driver->shutdown)
210 hcd->driver->shutdown(hcd);
214 static int exynos_ohci_suspend(struct device *dev)
216 struct usb_hcd *hcd = dev_get_drvdata(dev);
217 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
218 bool do_wakeup = device_may_wakeup(dev);
219 int rc = ohci_suspend(hcd, do_wakeup);
224 exynos_ohci_phy_disable(dev);
226 clk_disable_unprepare(exynos_ohci->clk);
231 static int exynos_ohci_resume(struct device *dev)
233 struct usb_hcd *hcd = dev_get_drvdata(dev);
234 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
237 clk_prepare_enable(exynos_ohci->clk);
239 ret = exynos_ohci_phy_enable(dev);
241 dev_err(dev, "Failed to enable USB phy\n");
242 clk_disable_unprepare(exynos_ohci->clk);
246 ohci_resume(hcd, false);
251 #define exynos_ohci_suspend NULL
252 #define exynos_ohci_resume NULL
255 static const struct ohci_driver_overrides exynos_overrides __initconst = {
256 .extra_priv_size = sizeof(struct exynos_ohci_hcd),
259 static const struct dev_pm_ops exynos_ohci_pm_ops = {
260 .suspend = exynos_ohci_suspend,
261 .resume = exynos_ohci_resume,
265 static const struct of_device_id exynos_ohci_match[] = {
266 { .compatible = "samsung,exynos4210-ohci" },
269 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
272 static struct platform_driver exynos_ohci_driver = {
273 .probe = exynos_ohci_probe,
274 .remove = exynos_ohci_remove,
275 .shutdown = exynos_ohci_shutdown,
277 .name = "exynos-ohci",
278 .pm = &exynos_ohci_pm_ops,
279 .of_match_table = of_match_ptr(exynos_ohci_match),
282 static int __init ohci_exynos_init(void)
287 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
288 ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
289 return platform_driver_register(&exynos_ohci_driver);
291 module_init(ohci_exynos_init);
293 static void __exit ohci_exynos_cleanup(void)
295 platform_driver_unregister(&exynos_ohci_driver);
297 module_exit(ohci_exynos_cleanup);
299 MODULE_ALIAS("platform:exynos-ohci");
300 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
301 MODULE_LICENSE("GPL v2");