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);
160 dev_err(&pdev->dev, "Failed to get IRQ\n");
165 platform_set_drvdata(pdev, hcd);
167 err = exynos_ohci_phy_enable(&pdev->dev);
169 dev_err(&pdev->dev, "Failed to enable USB phy\n");
173 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
175 dev_err(&pdev->dev, "Failed to add USB HCD\n");
178 device_wakeup_enable(hcd->self.controller);
182 exynos_ohci_phy_disable(&pdev->dev);
184 clk_disable_unprepare(exynos_ohci->clk);
190 static int exynos_ohci_remove(struct platform_device *pdev)
192 struct usb_hcd *hcd = platform_get_drvdata(pdev);
193 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
197 exynos_ohci_phy_disable(&pdev->dev);
199 clk_disable_unprepare(exynos_ohci->clk);
206 static void exynos_ohci_shutdown(struct platform_device *pdev)
208 struct usb_hcd *hcd = platform_get_drvdata(pdev);
210 if (hcd->driver->shutdown)
211 hcd->driver->shutdown(hcd);
215 static int exynos_ohci_suspend(struct device *dev)
217 struct usb_hcd *hcd = dev_get_drvdata(dev);
218 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
219 bool do_wakeup = device_may_wakeup(dev);
220 int rc = ohci_suspend(hcd, do_wakeup);
225 exynos_ohci_phy_disable(dev);
227 clk_disable_unprepare(exynos_ohci->clk);
232 static int exynos_ohci_resume(struct device *dev)
234 struct usb_hcd *hcd = dev_get_drvdata(dev);
235 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
238 clk_prepare_enable(exynos_ohci->clk);
240 ret = exynos_ohci_phy_enable(dev);
242 dev_err(dev, "Failed to enable USB phy\n");
243 clk_disable_unprepare(exynos_ohci->clk);
247 ohci_resume(hcd, false);
252 #define exynos_ohci_suspend NULL
253 #define exynos_ohci_resume NULL
256 static const struct ohci_driver_overrides exynos_overrides __initconst = {
257 .extra_priv_size = sizeof(struct exynos_ohci_hcd),
260 static const struct dev_pm_ops exynos_ohci_pm_ops = {
261 .suspend = exynos_ohci_suspend,
262 .resume = exynos_ohci_resume,
266 static const struct of_device_id exynos_ohci_match[] = {
267 { .compatible = "samsung,exynos4210-ohci" },
270 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
273 static struct platform_driver exynos_ohci_driver = {
274 .probe = exynos_ohci_probe,
275 .remove = exynos_ohci_remove,
276 .shutdown = exynos_ohci_shutdown,
278 .name = "exynos-ohci",
279 .pm = &exynos_ohci_pm_ops,
280 .of_match_table = of_match_ptr(exynos_ohci_match),
283 static int __init ohci_exynos_init(void)
288 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
289 ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
290 return platform_driver_register(&exynos_ohci_driver);
292 module_init(ohci_exynos_init);
294 static void __exit ohci_exynos_cleanup(void)
296 platform_driver_unregister(&exynos_ohci_driver);
298 module_exit(ohci_exynos_cleanup);
300 MODULE_ALIAS("platform:exynos-ohci");
301 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
302 MODULE_LICENSE("GPL v2");