1 // SPDX-License-Identifier: GPL-2.0
3 * OHCI HCD (Host Controller Driver) for USB.
5 * Copyright (C) 2010 ST Microelectronics.
6 * Deepak Sikri<deepak.sikri@st.com>
8 * Based on various ohci-*.c drivers
11 #include <linux/clk.h>
12 #include <linux/dma-mapping.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/signal.h>
19 #include <linux/usb.h>
20 #include <linux/usb/hcd.h>
24 #define DRIVER_DESC "OHCI SPEAr driver"
30 #define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
32 static struct hc_driver __read_mostly ohci_spear_hc_driver;
34 static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
36 const struct hc_driver *driver = &ohci_spear_hc_driver;
37 struct usb_hcd *hcd = NULL;
39 struct spear_ohci *sohci_p;
43 irq = platform_get_irq(pdev, 0);
50 * Right now device-tree probed devices don't get dma_mask set.
51 * Since shared usb code relies on it, set it here for now.
52 * Once we have dma capability bindings this can go away.
54 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
58 usbh_clk = devm_clk_get(&pdev->dev, NULL);
59 if (IS_ERR(usbh_clk)) {
60 dev_err(&pdev->dev, "Error getting interface clock\n");
61 retval = PTR_ERR(usbh_clk);
65 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
71 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
72 if (IS_ERR(hcd->regs)) {
73 retval = PTR_ERR(hcd->regs);
77 hcd->rsrc_start = res->start;
78 hcd->rsrc_len = resource_size(res);
80 sohci_p = to_spear_ohci(hcd);
81 sohci_p->clk = usbh_clk;
83 clk_prepare_enable(sohci_p->clk);
85 retval = usb_add_hcd(hcd, irq, 0);
87 device_wakeup_enable(hcd->self.controller);
91 clk_disable_unprepare(sohci_p->clk);
95 dev_err(&pdev->dev, "init fail, %d\n", retval);
100 static void spear_ohci_hcd_drv_remove(struct platform_device *pdev)
102 struct usb_hcd *hcd = platform_get_drvdata(pdev);
103 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
107 clk_disable_unprepare(sohci_p->clk);
112 #if defined(CONFIG_PM)
113 static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev,
114 pm_message_t message)
116 struct usb_hcd *hcd = platform_get_drvdata(pdev);
117 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
118 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
119 bool do_wakeup = device_may_wakeup(&pdev->dev);
122 if (time_before(jiffies, ohci->next_statechange))
124 ohci->next_statechange = jiffies;
126 ret = ohci_suspend(hcd, do_wakeup);
130 clk_disable_unprepare(sohci_p->clk);
135 static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
137 struct usb_hcd *hcd = platform_get_drvdata(dev);
138 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
139 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
141 if (time_before(jiffies, ohci->next_statechange))
143 ohci->next_statechange = jiffies;
145 clk_prepare_enable(sohci_p->clk);
146 ohci_resume(hcd, false);
151 static const struct of_device_id spear_ohci_id_table[] = {
152 { .compatible = "st,spear600-ohci", },
155 MODULE_DEVICE_TABLE(of, spear_ohci_id_table);
157 /* Driver definition to register with the platform bus */
158 static struct platform_driver spear_ohci_hcd_driver = {
159 .probe = spear_ohci_hcd_drv_probe,
160 .remove_new = spear_ohci_hcd_drv_remove,
162 .suspend = spear_ohci_hcd_drv_suspend,
163 .resume = spear_ohci_hcd_drv_resume,
166 .name = "spear-ohci",
167 .of_match_table = spear_ohci_id_table,
171 static const struct ohci_driver_overrides spear_overrides __initconst = {
172 .extra_priv_size = sizeof(struct spear_ohci),
174 static int __init ohci_spear_init(void)
179 ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
180 return platform_driver_register(&spear_ohci_hcd_driver);
182 module_init(ohci_spear_init);
184 static void __exit ohci_spear_cleanup(void)
186 platform_driver_unregister(&spear_ohci_hcd_driver);
188 module_exit(ohci_spear_cleanup);
190 MODULE_DESCRIPTION(DRIVER_DESC);
191 MODULE_AUTHOR("Deepak Sikri");
192 MODULE_LICENSE("GPL v2");
193 MODULE_ALIAS("platform:spear-ohci");