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 if (!pdev->dev.dma_mask)
75 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
76 if (!pdev->dev.coherent_dma_mask)
77 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
79 hcd = usb_create_hcd(&exynos_ohci_hc_driver,
80 &pdev->dev, dev_name(&pdev->dev));
82 dev_err(&pdev->dev, "Unable to create HCD\n");
86 exynos_ohci = to_exynos_ohci(hcd);
88 if (of_device_is_compatible(pdev->dev.of_node,
89 "samsung,exynos5440-ohci"))
92 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
95 dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
98 exynos_ohci->phy = phy;
99 exynos_ohci->otg = phy->otg;
103 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
105 if (IS_ERR(exynos_ohci->clk)) {
106 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
107 err = PTR_ERR(exynos_ohci->clk);
111 err = clk_prepare_enable(exynos_ohci->clk);
115 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
117 dev_err(&pdev->dev, "Failed to get I/O memory\n");
122 hcd->rsrc_start = res->start;
123 hcd->rsrc_len = resource_size(res);
124 hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
126 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
131 irq = platform_get_irq(pdev, 0);
133 dev_err(&pdev->dev, "Failed to get IRQ\n");
138 if (exynos_ohci->otg)
139 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
141 platform_set_drvdata(pdev, hcd);
143 exynos_ohci_phy_enable(pdev);
145 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
147 dev_err(&pdev->dev, "Failed to add USB HCD\n");
153 exynos_ohci_phy_disable(pdev);
155 clk_disable_unprepare(exynos_ohci->clk);
161 static int exynos_ohci_remove(struct platform_device *pdev)
163 struct usb_hcd *hcd = platform_get_drvdata(pdev);
164 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
168 if (exynos_ohci->otg)
169 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
171 exynos_ohci_phy_disable(pdev);
173 clk_disable_unprepare(exynos_ohci->clk);
180 static void exynos_ohci_shutdown(struct platform_device *pdev)
182 struct usb_hcd *hcd = platform_get_drvdata(pdev);
184 if (hcd->driver->shutdown)
185 hcd->driver->shutdown(hcd);
189 static int exynos_ohci_suspend(struct device *dev)
191 struct usb_hcd *hcd = dev_get_drvdata(dev);
192 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
193 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
194 struct platform_device *pdev = to_platform_device(dev);
199 * Root hub was already suspended. Disable irq emission and
200 * mark HW unaccessible, bail out if RH has been resumed. Use
201 * the spinlock to properly synchronize with possible pending
202 * RH suspend or resume activity.
204 spin_lock_irqsave(&ohci->lock, flags);
205 if (ohci->rh_state != OHCI_RH_SUSPENDED &&
206 ohci->rh_state != OHCI_RH_HALTED) {
211 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
213 if (exynos_ohci->otg)
214 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
216 exynos_ohci_phy_disable(pdev);
218 clk_disable_unprepare(exynos_ohci->clk);
221 spin_unlock_irqrestore(&ohci->lock, flags);
226 static int exynos_ohci_resume(struct device *dev)
228 struct usb_hcd *hcd = dev_get_drvdata(dev);
229 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
230 struct platform_device *pdev = to_platform_device(dev);
232 clk_prepare_enable(exynos_ohci->clk);
234 if (exynos_ohci->otg)
235 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
237 exynos_ohci_phy_enable(pdev);
239 ohci_resume(hcd, false);
244 #define exynos_ohci_suspend NULL
245 #define exynos_ohci_resume NULL
248 static const struct ohci_driver_overrides exynos_overrides __initconst = {
249 .extra_priv_size = sizeof(struct exynos_ohci_hcd),
252 static const struct dev_pm_ops exynos_ohci_pm_ops = {
253 .suspend = exynos_ohci_suspend,
254 .resume = exynos_ohci_resume,
258 static const struct of_device_id exynos_ohci_match[] = {
259 { .compatible = "samsung,exynos4210-ohci" },
260 { .compatible = "samsung,exynos5440-ohci" },
263 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
266 static struct platform_driver exynos_ohci_driver = {
267 .probe = exynos_ohci_probe,
268 .remove = exynos_ohci_remove,
269 .shutdown = exynos_ohci_shutdown,
271 .name = "exynos-ohci",
272 .owner = THIS_MODULE,
273 .pm = &exynos_ohci_pm_ops,
274 .of_match_table = of_match_ptr(exynos_ohci_match),
277 static int __init ohci_exynos_init(void)
282 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
283 ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
284 return platform_driver_register(&exynos_ohci_driver);
286 module_init(ohci_exynos_init);
288 static void __exit ohci_exynos_cleanup(void)
290 platform_driver_unregister(&exynos_ohci_driver);
292 module_exit(ohci_exynos_cleanup);
294 MODULE_ALIAS("platform:exynos-ohci");
295 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
296 MODULE_LICENSE("GPL v2");