ALSA: usb-audio: mixer: volume quirk for ESS Technology Asus USB DAC
[linux/fpc-iii.git] / drivers / usb / host / ohci-spear.c
blob69fa04697793c5a9dfa4f3f00b1e2cb194c91e1d
1 // SPDX-License-Identifier: GPL-2.0
2 /*
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
9 */
11 #include <linux/clk.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/io.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/platform_device.h>
18 #include <linux/signal.h>
19 #include <linux/usb.h>
20 #include <linux/usb/hcd.h>
22 #include "ohci.h"
24 #define DRIVER_DESC "OHCI SPEAr driver"
26 static const char hcd_name[] = "SPEAr-ohci";
27 struct spear_ohci {
28 struct clk *clk;
31 #define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
33 static struct hc_driver __read_mostly ohci_spear_hc_driver;
35 static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
37 const struct hc_driver *driver = &ohci_spear_hc_driver;
38 struct ohci_hcd *ohci;
39 struct usb_hcd *hcd = NULL;
40 struct clk *usbh_clk;
41 struct spear_ohci *sohci_p;
42 struct resource *res;
43 int retval, irq;
45 irq = platform_get_irq(pdev, 0);
46 if (irq < 0) {
47 retval = irq;
48 goto fail;
52 * Right now device-tree probed devices don't get dma_mask set.
53 * Since shared usb code relies on it, set it here for now.
54 * Once we have dma capability bindings this can go away.
56 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
57 if (retval)
58 goto fail;
60 usbh_clk = devm_clk_get(&pdev->dev, NULL);
61 if (IS_ERR(usbh_clk)) {
62 dev_err(&pdev->dev, "Error getting interface clock\n");
63 retval = PTR_ERR(usbh_clk);
64 goto fail;
67 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
68 if (!hcd) {
69 retval = -ENOMEM;
70 goto fail;
73 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
74 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
75 if (IS_ERR(hcd->regs)) {
76 retval = PTR_ERR(hcd->regs);
77 goto err_put_hcd;
80 hcd->rsrc_start = pdev->resource[0].start;
81 hcd->rsrc_len = resource_size(res);
83 sohci_p = to_spear_ohci(hcd);
84 sohci_p->clk = usbh_clk;
86 clk_prepare_enable(sohci_p->clk);
88 ohci = hcd_to_ohci(hcd);
90 retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
91 if (retval == 0) {
92 device_wakeup_enable(hcd->self.controller);
93 return retval;
96 clk_disable_unprepare(sohci_p->clk);
97 err_put_hcd:
98 usb_put_hcd(hcd);
99 fail:
100 dev_err(&pdev->dev, "init fail, %d\n", retval);
102 return retval;
105 static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
107 struct usb_hcd *hcd = platform_get_drvdata(pdev);
108 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
110 usb_remove_hcd(hcd);
111 if (sohci_p->clk)
112 clk_disable_unprepare(sohci_p->clk);
114 usb_put_hcd(hcd);
115 return 0;
118 #if defined(CONFIG_PM)
119 static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev,
120 pm_message_t message)
122 struct usb_hcd *hcd = platform_get_drvdata(pdev);
123 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
124 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
125 bool do_wakeup = device_may_wakeup(&pdev->dev);
126 int ret;
128 if (time_before(jiffies, ohci->next_statechange))
129 msleep(5);
130 ohci->next_statechange = jiffies;
132 ret = ohci_suspend(hcd, do_wakeup);
133 if (ret)
134 return ret;
136 clk_disable_unprepare(sohci_p->clk);
138 return ret;
141 static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
143 struct usb_hcd *hcd = platform_get_drvdata(dev);
144 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
145 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
147 if (time_before(jiffies, ohci->next_statechange))
148 msleep(5);
149 ohci->next_statechange = jiffies;
151 clk_prepare_enable(sohci_p->clk);
152 ohci_resume(hcd, false);
153 return 0;
155 #endif
157 static const struct of_device_id spear_ohci_id_table[] = {
158 { .compatible = "st,spear600-ohci", },
159 { },
161 MODULE_DEVICE_TABLE(of, spear_ohci_id_table);
163 /* Driver definition to register with the platform bus */
164 static struct platform_driver spear_ohci_hcd_driver = {
165 .probe = spear_ohci_hcd_drv_probe,
166 .remove = spear_ohci_hcd_drv_remove,
167 #ifdef CONFIG_PM
168 .suspend = spear_ohci_hcd_drv_suspend,
169 .resume = spear_ohci_hcd_drv_resume,
170 #endif
171 .driver = {
172 .name = "spear-ohci",
173 .of_match_table = spear_ohci_id_table,
177 static const struct ohci_driver_overrides spear_overrides __initconst = {
178 .extra_priv_size = sizeof(struct spear_ohci),
180 static int __init ohci_spear_init(void)
182 if (usb_disabled())
183 return -ENODEV;
185 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
187 ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
188 return platform_driver_register(&spear_ohci_hcd_driver);
190 module_init(ohci_spear_init);
192 static void __exit ohci_spear_cleanup(void)
194 platform_driver_unregister(&spear_ohci_hcd_driver);
196 module_exit(ohci_spear_cleanup);
198 MODULE_DESCRIPTION(DRIVER_DESC);
199 MODULE_AUTHOR("Deepak Sikri");
200 MODULE_LICENSE("GPL v2");
201 MODULE_ALIAS("platform:spear-ohci");