2 * SAMSUNG EXYNOS USB HOST EHCI Controller
4 * Copyright (C) 2011 Samsung Electronics Co.Ltd
5 * Author: Jingoo Han <jg1.han@samsung.com>
6 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
15 #include <linux/clk.h>
16 #include <linux/dma-mapping.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
21 #include <linux/of_gpio.h>
22 #include <linux/phy/phy.h>
23 #include <linux/platform_device.h>
24 #include <linux/usb.h>
25 #include <linux/usb/hcd.h>
29 #define DRIVER_DESC "EHCI EXYNOS driver"
31 #define EHCI_INSNREG00(base) (base + 0x90)
32 #define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
33 #define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
34 #define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
35 #define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
36 #define EHCI_INSNREG00_ENABLE_DMA_BURST \
37 (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
38 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
40 static const char hcd_name[] = "ehci-exynos";
41 static struct hc_driver __read_mostly exynos_ehci_hc_driver;
45 struct exynos_ehci_hcd {
47 struct phy *phy[PHY_NUMBER];
50 #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
52 static int exynos_ehci_get_phy(struct device *dev,
53 struct exynos_ehci_hcd *exynos_ehci)
55 struct device_node *child;
60 /* Get PHYs for the controller */
61 for_each_available_child_of_node(dev->of_node, child) {
62 ret = of_property_read_u32(child, "reg", &phy_number);
64 dev_err(dev, "Failed to parse device tree\n");
69 if (phy_number >= PHY_NUMBER) {
70 dev_err(dev, "Invalid number of PHYs\n");
75 phy = devm_of_phy_get(dev, child, NULL);
76 exynos_ehci->phy[phy_number] = phy;
80 if (ret == -EPROBE_DEFER) {
82 } else if (ret != -ENOSYS && ret != -ENODEV) {
84 "Error retrieving usb2 phy: %d\n", ret);
93 static int exynos_ehci_phy_enable(struct device *dev)
95 struct usb_hcd *hcd = dev_get_drvdata(dev);
96 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
100 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
101 if (!IS_ERR(exynos_ehci->phy[i]))
102 ret = phy_power_on(exynos_ehci->phy[i]);
104 for (i--; i >= 0; i--)
105 if (!IS_ERR(exynos_ehci->phy[i]))
106 phy_power_off(exynos_ehci->phy[i]);
111 static void exynos_ehci_phy_disable(struct device *dev)
113 struct usb_hcd *hcd = dev_get_drvdata(dev);
114 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
117 for (i = 0; i < PHY_NUMBER; i++)
118 if (!IS_ERR(exynos_ehci->phy[i]))
119 phy_power_off(exynos_ehci->phy[i]);
122 static void exynos_setup_vbus_gpio(struct device *dev)
130 gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
131 if (!gpio_is_valid(gpio))
134 err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
137 dev_err(dev, "can't request ehci vbus gpio %d", gpio);
140 static int exynos_ehci_probe(struct platform_device *pdev)
142 struct exynos_ehci_hcd *exynos_ehci;
144 struct ehci_hcd *ehci;
145 struct resource *res;
150 * Right now device-tree probed devices don't get dma_mask set.
151 * Since shared usb code relies on it, set it here for now.
152 * Once we move to full device tree support this will vanish off.
154 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
158 exynos_setup_vbus_gpio(&pdev->dev);
160 hcd = usb_create_hcd(&exynos_ehci_hc_driver,
161 &pdev->dev, dev_name(&pdev->dev));
163 dev_err(&pdev->dev, "Unable to create HCD\n");
166 exynos_ehci = to_exynos_ehci(hcd);
168 if (of_device_is_compatible(pdev->dev.of_node,
169 "samsung,exynos5440-ehci"))
172 err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
178 exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
180 if (IS_ERR(exynos_ehci->clk)) {
181 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
182 err = PTR_ERR(exynos_ehci->clk);
186 err = clk_prepare_enable(exynos_ehci->clk);
190 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
192 dev_err(&pdev->dev, "Failed to get I/O memory\n");
197 hcd->rsrc_start = res->start;
198 hcd->rsrc_len = resource_size(res);
199 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
200 if (IS_ERR(hcd->regs)) {
201 err = PTR_ERR(hcd->regs);
205 irq = platform_get_irq(pdev, 0);
207 dev_err(&pdev->dev, "Failed to get IRQ\n");
212 err = exynos_ehci_phy_enable(&pdev->dev);
214 dev_err(&pdev->dev, "Failed to enable USB phy\n");
218 ehci = hcd_to_ehci(hcd);
219 ehci->caps = hcd->regs;
221 /* DMA burst Enable */
222 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
224 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
226 dev_err(&pdev->dev, "Failed to add USB HCD\n");
229 device_wakeup_enable(hcd->self.controller);
231 platform_set_drvdata(pdev, hcd);
236 exynos_ehci_phy_disable(&pdev->dev);
238 clk_disable_unprepare(exynos_ehci->clk);
244 static int exynos_ehci_remove(struct platform_device *pdev)
246 struct usb_hcd *hcd = platform_get_drvdata(pdev);
247 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
251 exynos_ehci_phy_disable(&pdev->dev);
253 clk_disable_unprepare(exynos_ehci->clk);
261 static int exynos_ehci_suspend(struct device *dev)
263 struct usb_hcd *hcd = dev_get_drvdata(dev);
264 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
266 bool do_wakeup = device_may_wakeup(dev);
269 rc = ehci_suspend(hcd, do_wakeup);
273 exynos_ehci_phy_disable(dev);
275 clk_disable_unprepare(exynos_ehci->clk);
280 static int exynos_ehci_resume(struct device *dev)
282 struct usb_hcd *hcd = dev_get_drvdata(dev);
283 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
286 clk_prepare_enable(exynos_ehci->clk);
288 ret = exynos_ehci_phy_enable(dev);
290 dev_err(dev, "Failed to enable USB phy\n");
291 clk_disable_unprepare(exynos_ehci->clk);
295 /* DMA burst Enable */
296 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
298 ehci_resume(hcd, false);
302 #define exynos_ehci_suspend NULL
303 #define exynos_ehci_resume NULL
306 static const struct dev_pm_ops exynos_ehci_pm_ops = {
307 .suspend = exynos_ehci_suspend,
308 .resume = exynos_ehci_resume,
312 static const struct of_device_id exynos_ehci_match[] = {
313 { .compatible = "samsung,exynos4210-ehci" },
314 { .compatible = "samsung,exynos5440-ehci" },
317 MODULE_DEVICE_TABLE(of, exynos_ehci_match);
320 static struct platform_driver exynos_ehci_driver = {
321 .probe = exynos_ehci_probe,
322 .remove = exynos_ehci_remove,
323 .shutdown = usb_hcd_platform_shutdown,
325 .name = "exynos-ehci",
326 .owner = THIS_MODULE,
327 .pm = &exynos_ehci_pm_ops,
328 .of_match_table = of_match_ptr(exynos_ehci_match),
331 static const struct ehci_driver_overrides exynos_overrides __initdata = {
332 .extra_priv_size = sizeof(struct exynos_ehci_hcd),
335 static int __init ehci_exynos_init(void)
340 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
341 ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
342 return platform_driver_register(&exynos_ehci_driver);
344 module_init(ehci_exynos_init);
346 static void __exit ehci_exynos_cleanup(void)
348 platform_driver_unregister(&exynos_ehci_driver);
350 module_exit(ehci_exynos_cleanup);
352 MODULE_DESCRIPTION(DRIVER_DESC);
353 MODULE_ALIAS("platform:exynos-ehci");
354 MODULE_AUTHOR("Jingoo Han");
355 MODULE_AUTHOR("Joonyoung Shim");
356 MODULE_LICENSE("GPL v2");