1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
4 * Author: Chao Xie <chao.xie@marvell.com>
5 * Neil Zhang <zhangwm@marvell.com>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/clk.h>
12 #include <linux/err.h>
13 #include <linux/usb/otg.h>
14 #include <linux/usb/of.h>
15 #include <linux/platform_data/mv_usb.h>
18 #include <linux/usb/hcd.h>
23 #define U2x_CAPREGS_OFFSET 0x100
25 #define CAPLENGTH_MASK (0xff)
27 #define hcd_to_ehci_hcd_mv(h) ((struct ehci_hcd_mv *)hcd_to_ehci(h)->priv)
30 /* Which mode does this ehci running OTG/Host ? */
34 void __iomem *cap_regs;
35 void __iomem *op_regs;
42 int (*set_vbus)(unsigned int vbus);
45 static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
47 clk_prepare_enable(ehci_mv->clk);
50 static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
52 clk_disable_unprepare(ehci_mv->clk);
55 static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
57 ehci_clock_enable(ehci_mv);
58 return phy_init(ehci_mv->phy);
61 static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
63 phy_exit(ehci_mv->phy);
64 ehci_clock_disable(ehci_mv);
67 static int mv_ehci_reset(struct usb_hcd *hcd)
69 struct device *dev = hcd->self.controller;
70 struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
71 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
75 if (ehci_mv == NULL) {
76 dev_err(dev, "Can not find private ehci data\n");
82 retval = ehci_setup(hcd);
84 dev_err(dev, "ehci_setup failed %d\n", retval);
86 if (of_usb_get_phy_mode(dev->of_node) == USBPHY_INTERFACE_MODE_HSIC) {
87 status = ehci_readl(ehci, &ehci->regs->port_status[0]);
88 status |= PORT_TEST_FORCE;
89 ehci_writel(ehci, status, &ehci->regs->port_status[0]);
90 status &= ~PORT_TEST_FORCE;
91 ehci_writel(ehci, status, &ehci->regs->port_status[0]);
97 static struct hc_driver __read_mostly ehci_platform_hc_driver;
99 static const struct ehci_driver_overrides platform_overrides __initconst = {
100 .reset = mv_ehci_reset,
101 .extra_priv_size = sizeof(struct ehci_hcd_mv),
104 static int mv_ehci_probe(struct platform_device *pdev)
106 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
108 struct ehci_hcd *ehci;
109 struct ehci_hcd_mv *ehci_mv;
111 int retval = -ENODEV;
117 hcd = usb_create_hcd(&ehci_platform_hc_driver, &pdev->dev, "mv ehci");
121 platform_set_drvdata(pdev, hcd);
122 ehci_mv = hcd_to_ehci_hcd_mv(hcd);
124 ehci_mv->mode = MV_USB_MODE_HOST;
126 ehci_mv->mode = pdata->mode;
127 ehci_mv->set_vbus = pdata->set_vbus;
130 ehci_mv->phy = devm_phy_optional_get(&pdev->dev, "usb");
131 if (IS_ERR(ehci_mv->phy)) {
132 retval = PTR_ERR(ehci_mv->phy);
133 if (retval != -EPROBE_DEFER)
134 dev_err(&pdev->dev, "Failed to get phy.\n");
138 ehci_mv->clk = devm_clk_get(&pdev->dev, NULL);
139 if (IS_ERR(ehci_mv->clk)) {
140 dev_err(&pdev->dev, "error getting clock\n");
141 retval = PTR_ERR(ehci_mv->clk);
147 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
148 ehci_mv->base = devm_ioremap_resource(&pdev->dev, r);
149 if (IS_ERR(ehci_mv->base)) {
150 retval = PTR_ERR(ehci_mv->base);
154 retval = mv_ehci_enable(ehci_mv);
156 dev_err(&pdev->dev, "init phy error %d\n", retval);
161 (void __iomem *) ((unsigned long) ehci_mv->base + U2x_CAPREGS_OFFSET);
162 offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
164 (void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
166 hcd->rsrc_start = r->start;
167 hcd->rsrc_len = resource_size(r);
168 hcd->regs = ehci_mv->op_regs;
170 hcd->irq = platform_get_irq(pdev, 0);
172 dev_err(&pdev->dev, "Cannot get irq.");
174 goto err_disable_clk;
177 ehci = hcd_to_ehci(hcd);
178 ehci->caps = (struct ehci_caps __iomem *) ehci_mv->cap_regs;
180 if (ehci_mv->mode == MV_USB_MODE_OTG) {
181 ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
182 if (IS_ERR(ehci_mv->otg)) {
183 retval = PTR_ERR(ehci_mv->otg);
185 if (retval == -ENXIO)
186 dev_info(&pdev->dev, "MV_USB_MODE_OTG "
187 "must have CONFIG_USB_PHY enabled\n");
190 "unable to find transceiver\n");
191 goto err_disable_clk;
194 retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
197 "unable to register with transceiver\n");
199 goto err_disable_clk;
201 /* otg will enable clock before use as host */
202 mv_ehci_disable(ehci_mv);
204 if (ehci_mv->set_vbus)
205 ehci_mv->set_vbus(1);
207 retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
210 "failed to add hcd with err %d\n", retval);
213 device_wakeup_enable(hcd->self.controller);
217 "successful find EHCI device with regs 0x%p irq %d"
218 " working in %s mode\n", hcd->regs, hcd->irq,
219 ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
224 if (ehci_mv->set_vbus)
225 ehci_mv->set_vbus(0);
227 mv_ehci_disable(ehci_mv);
234 static int mv_ehci_remove(struct platform_device *pdev)
236 struct usb_hcd *hcd = platform_get_drvdata(pdev);
237 struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
239 if (hcd->rh_registered)
242 if (!IS_ERR_OR_NULL(ehci_mv->otg))
243 otg_set_host(ehci_mv->otg->otg, NULL);
245 if (ehci_mv->mode == MV_USB_MODE_HOST) {
246 if (ehci_mv->set_vbus)
247 ehci_mv->set_vbus(0);
249 mv_ehci_disable(ehci_mv);
257 MODULE_ALIAS("mv-ehci");
259 static const struct platform_device_id ehci_id_table[] = {
265 static void mv_ehci_shutdown(struct platform_device *pdev)
267 struct usb_hcd *hcd = platform_get_drvdata(pdev);
269 if (!hcd->rh_registered)
272 if (hcd->driver->shutdown)
273 hcd->driver->shutdown(hcd);
276 static const struct of_device_id ehci_mv_dt_ids[] = {
277 { .compatible = "marvell,pxau2o-ehci", },
281 static struct platform_driver ehci_mv_driver = {
282 .probe = mv_ehci_probe,
283 .remove = mv_ehci_remove,
284 .shutdown = mv_ehci_shutdown,
287 .bus = &platform_bus_type,
288 .of_match_table = ehci_mv_dt_ids,
290 .id_table = ehci_id_table,
293 static int __init ehci_platform_init(void)
298 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
299 return platform_driver_register(&ehci_mv_driver);
301 module_init(ehci_platform_init);
303 static void __exit ehci_platform_cleanup(void)
305 platform_driver_unregister(&ehci_mv_driver);
307 module_exit(ehci_platform_cleanup);
309 MODULE_DESCRIPTION("Marvell EHCI driver");
310 MODULE_AUTHOR("Chao Xie <chao.xie@marvell.com>");
311 MODULE_AUTHOR("Neil Zhang <zhangwm@marvell.com>");
312 MODULE_ALIAS("mv-ehci");
313 MODULE_LICENSE("GPL");
314 MODULE_DEVICE_TABLE(of, ehci_mv_dt_ids);