1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for EHCI HCD on SPEAr SOC
5 * Copyright (C) 2010 ST Micro Electronics,
6 * Deepak Sikri <deepak.sikri@st.com>
8 * Based on various ehci-*.c drivers
11 #include <linux/clk.h>
12 #include <linux/dma-mapping.h>
14 #include <linux/jiffies.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
18 #include <linux/platform_device.h>
20 #include <linux/usb.h>
21 #include <linux/usb/hcd.h>
25 #define DRIVER_DESC "EHCI SPEAr driver"
27 static const char hcd_name[] = "SPEAr-ehci";
33 #define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
35 static struct hc_driver __read_mostly ehci_spear_hc_driver;
37 static int __maybe_unused ehci_spear_drv_suspend(struct device *dev)
39 struct usb_hcd *hcd = dev_get_drvdata(dev);
40 bool do_wakeup = device_may_wakeup(dev);
42 return ehci_suspend(hcd, do_wakeup);
45 static int __maybe_unused ehci_spear_drv_resume(struct device *dev)
47 struct usb_hcd *hcd = dev_get_drvdata(dev);
49 ehci_resume(hcd, false);
53 static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
54 ehci_spear_drv_resume);
56 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
59 struct spear_ehci *sehci;
62 const struct hc_driver *driver = &ehci_spear_hc_driver;
68 irq = platform_get_irq(pdev, 0);
75 * Right now device-tree probed devices don't get dma_mask set.
76 * Since shared usb code relies on it, set it here for now.
77 * Once we have dma capability bindings this can go away.
79 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
83 usbh_clk = devm_clk_get(&pdev->dev, NULL);
84 if (IS_ERR(usbh_clk)) {
85 dev_err(&pdev->dev, "Error getting interface clock\n");
86 retval = PTR_ERR(usbh_clk);
90 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
96 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
97 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
98 if (IS_ERR(hcd->regs)) {
99 retval = PTR_ERR(hcd->regs);
102 hcd->rsrc_start = res->start;
103 hcd->rsrc_len = resource_size(res);
105 sehci = to_spear_ehci(hcd);
106 sehci->clk = usbh_clk;
108 /* registers start at offset 0x0 */
109 hcd_to_ehci(hcd)->caps = hcd->regs;
111 clk_prepare_enable(sehci->clk);
112 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
116 device_wakeup_enable(hcd->self.controller);
120 clk_disable_unprepare(sehci->clk);
124 dev_err(&pdev->dev, "init fail, %d\n", retval);
129 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
131 struct usb_hcd *hcd = platform_get_drvdata(pdev);
132 struct spear_ehci *sehci = to_spear_ehci(hcd);
137 clk_disable_unprepare(sehci->clk);
143 static const struct of_device_id spear_ehci_id_table[] = {
144 { .compatible = "st,spear600-ehci", },
147 MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
149 static struct platform_driver spear_ehci_hcd_driver = {
150 .probe = spear_ehci_hcd_drv_probe,
151 .remove = spear_ehci_hcd_drv_remove,
152 .shutdown = usb_hcd_platform_shutdown,
154 .name = "spear-ehci",
155 .bus = &platform_bus_type,
156 .pm = pm_ptr(&ehci_spear_pm_ops),
157 .of_match_table = spear_ehci_id_table,
161 static const struct ehci_driver_overrides spear_overrides __initconst = {
162 .extra_priv_size = sizeof(struct spear_ehci),
165 static int __init ehci_spear_init(void)
170 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
172 ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
173 return platform_driver_register(&spear_ehci_hcd_driver);
175 module_init(ehci_spear_init);
177 static void __exit ehci_spear_cleanup(void)
179 platform_driver_unregister(&spear_ehci_hcd_driver);
181 module_exit(ehci_spear_cleanup);
183 MODULE_DESCRIPTION(DRIVER_DESC);
184 MODULE_ALIAS("platform:spear-ehci");
185 MODULE_AUTHOR("Deepak Sikri");
186 MODULE_LICENSE("GPL");