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>
16 #include <linux/platform_device.h>
17 #include <linux/platform_data/usb-ohci-exynos.h>
18 #include <linux/usb/phy.h>
19 #include <linux/usb/samsung_usb_phy.h>
21 struct exynos_ohci_hcd {
27 struct exynos4_ohci_platdata *pdata;
30 static void exynos_ohci_phy_enable(struct exynos_ohci_hcd *exynos_ohci)
32 struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
35 usb_phy_init(exynos_ohci->phy);
36 else if (exynos_ohci->pdata && exynos_ohci->pdata->phy_init)
37 exynos_ohci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
40 static void exynos_ohci_phy_disable(struct exynos_ohci_hcd *exynos_ohci)
42 struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
45 usb_phy_shutdown(exynos_ohci->phy);
46 else if (exynos_ohci->pdata && exynos_ohci->pdata->phy_exit)
47 exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
50 static int ohci_exynos_reset(struct usb_hcd *hcd)
52 return ohci_init(hcd_to_ohci(hcd));
55 static int ohci_exynos_start(struct usb_hcd *hcd)
57 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
60 ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
64 dev_err(hcd->self.controller, "can't start %s\n",
73 static const struct hc_driver exynos_ohci_hc_driver = {
74 .description = hcd_name,
75 .product_desc = "EXYNOS OHCI Host Controller",
76 .hcd_priv_size = sizeof(struct ohci_hcd),
79 .flags = HCD_MEMORY|HCD_USB11,
81 .reset = ohci_exynos_reset,
82 .start = ohci_exynos_start,
84 .shutdown = ohci_shutdown,
86 .get_frame_number = ohci_get_frame,
88 .urb_enqueue = ohci_urb_enqueue,
89 .urb_dequeue = ohci_urb_dequeue,
90 .endpoint_disable = ohci_endpoint_disable,
92 .hub_status_data = ohci_hub_status_data,
93 .hub_control = ohci_hub_control,
95 .bus_suspend = ohci_bus_suspend,
96 .bus_resume = ohci_bus_resume,
98 .start_port_reset = ohci_start_port_reset,
101 static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32);
103 static int exynos_ohci_probe(struct platform_device *pdev)
105 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
106 struct exynos_ohci_hcd *exynos_ohci;
108 struct ohci_hcd *ohci;
109 struct resource *res;
115 * Right now device-tree probed devices don't get dma_mask set.
116 * Since shared usb code relies on it, set it here for now.
117 * Once we move to full device tree support this will vanish off.
119 if (!pdev->dev.dma_mask)
120 pdev->dev.dma_mask = &ohci_exynos_dma_mask;
121 if (!pdev->dev.coherent_dma_mask)
122 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
124 exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd),
129 if (of_device_is_compatible(pdev->dev.of_node,
130 "samsung,exynos5440-ohci"))
133 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
135 /* Fallback to pdata */
137 dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
138 return -EPROBE_DEFER;
140 exynos_ohci->pdata = pdata;
143 exynos_ohci->phy = phy;
144 exynos_ohci->otg = phy->otg;
149 exynos_ohci->dev = &pdev->dev;
151 hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
152 dev_name(&pdev->dev));
154 dev_err(&pdev->dev, "Unable to create HCD\n");
158 exynos_ohci->hcd = hcd;
159 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
161 if (IS_ERR(exynos_ohci->clk)) {
162 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
163 err = PTR_ERR(exynos_ohci->clk);
167 err = clk_prepare_enable(exynos_ohci->clk);
171 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
173 dev_err(&pdev->dev, "Failed to get I/O memory\n");
178 hcd->rsrc_start = res->start;
179 hcd->rsrc_len = resource_size(res);
180 hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
182 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
187 irq = platform_get_irq(pdev, 0);
189 dev_err(&pdev->dev, "Failed to get IRQ\n");
194 if (exynos_ohci->otg)
195 exynos_ohci->otg->set_host(exynos_ohci->otg,
196 &exynos_ohci->hcd->self);
198 exynos_ohci_phy_enable(exynos_ohci);
200 ohci = hcd_to_ohci(hcd);
203 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
205 dev_err(&pdev->dev, "Failed to add USB HCD\n");
209 platform_set_drvdata(pdev, exynos_ohci);
214 exynos_ohci_phy_disable(exynos_ohci);
216 clk_disable_unprepare(exynos_ohci->clk);
222 static int exynos_ohci_remove(struct platform_device *pdev)
224 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
225 struct usb_hcd *hcd = exynos_ohci->hcd;
229 if (exynos_ohci->otg)
230 exynos_ohci->otg->set_host(exynos_ohci->otg,
231 &exynos_ohci->hcd->self);
233 exynos_ohci_phy_disable(exynos_ohci);
235 clk_disable_unprepare(exynos_ohci->clk);
242 static void exynos_ohci_shutdown(struct platform_device *pdev)
244 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
245 struct usb_hcd *hcd = exynos_ohci->hcd;
247 if (hcd->driver->shutdown)
248 hcd->driver->shutdown(hcd);
252 static int exynos_ohci_suspend(struct device *dev)
254 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
255 struct usb_hcd *hcd = exynos_ohci->hcd;
256 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
261 * Root hub was already suspended. Disable irq emission and
262 * mark HW unaccessible, bail out if RH has been resumed. Use
263 * the spinlock to properly synchronize with possible pending
264 * RH suspend or resume activity.
266 spin_lock_irqsave(&ohci->lock, flags);
267 if (ohci->rh_state != OHCI_RH_SUSPENDED &&
268 ohci->rh_state != OHCI_RH_HALTED) {
273 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
275 if (exynos_ohci->otg)
276 exynos_ohci->otg->set_host(exynos_ohci->otg,
277 &exynos_ohci->hcd->self);
279 exynos_ohci_phy_disable(exynos_ohci);
281 clk_disable_unprepare(exynos_ohci->clk);
284 spin_unlock_irqrestore(&ohci->lock, flags);
289 static int exynos_ohci_resume(struct device *dev)
291 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
292 struct usb_hcd *hcd = exynos_ohci->hcd;
294 clk_prepare_enable(exynos_ohci->clk);
296 if (exynos_ohci->otg)
297 exynos_ohci->otg->set_host(exynos_ohci->otg,
298 &exynos_ohci->hcd->self);
300 exynos_ohci_phy_enable(exynos_ohci);
302 ohci_resume(hcd, false);
307 #define exynos_ohci_suspend NULL
308 #define exynos_ohci_resume NULL
311 static const struct dev_pm_ops exynos_ohci_pm_ops = {
312 .suspend = exynos_ohci_suspend,
313 .resume = exynos_ohci_resume,
317 static const struct of_device_id exynos_ohci_match[] = {
318 { .compatible = "samsung,exynos4210-ohci" },
319 { .compatible = "samsung,exynos5440-ohci" },
322 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
325 static struct platform_driver exynos_ohci_driver = {
326 .probe = exynos_ohci_probe,
327 .remove = exynos_ohci_remove,
328 .shutdown = exynos_ohci_shutdown,
330 .name = "exynos-ohci",
331 .owner = THIS_MODULE,
332 .pm = &exynos_ohci_pm_ops,
333 .of_match_table = of_match_ptr(exynos_ohci_match),
337 MODULE_ALIAS("platform:exynos-ohci");
338 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");