PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / usb / host / ohci-spear.c
blob8b29a0c04c23b9958e9e21b91d73d8f35c944c8e
1 /*
2 * OHCI HCD (Host Controller Driver) for USB.
4 * Copyright (C) 2010 ST Microelectronics.
5 * Deepak Sikri<deepak.sikri@st.com>
7 * Based on various ohci-*.c drivers
9 * This file is licensed under the terms of the GNU General Public
10 * License version 2. This program is licensed "as is" without any
11 * warranty of any kind, whether express or implied.
14 #include <linux/clk.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/io.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/of.h>
20 #include <linux/platform_device.h>
21 #include <linux/signal.h>
22 #include <linux/usb.h>
23 #include <linux/usb/hcd.h>
25 #include "ohci.h"
27 #define DRIVER_DESC "OHCI SPEAr driver"
29 static const char hcd_name[] = "SPEAr-ohci";
30 struct spear_ohci {
31 struct clk *clk;
34 #define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
36 static struct hc_driver __read_mostly ohci_spear_hc_driver;
38 static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
40 const struct hc_driver *driver = &ohci_spear_hc_driver;
41 struct ohci_hcd *ohci;
42 struct usb_hcd *hcd = NULL;
43 struct clk *usbh_clk;
44 struct spear_ohci *sohci_p;
45 struct resource *res;
46 int retval, irq;
48 irq = platform_get_irq(pdev, 0);
49 if (irq < 0) {
50 retval = irq;
51 goto fail;
55 * Right now device-tree probed devices don't get dma_mask set.
56 * Since shared usb code relies on it, set it here for now.
57 * Once we have dma capability bindings this can go away.
59 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
60 if (retval)
61 goto fail;
63 usbh_clk = devm_clk_get(&pdev->dev, NULL);
64 if (IS_ERR(usbh_clk)) {
65 dev_err(&pdev->dev, "Error getting interface clock\n");
66 retval = PTR_ERR(usbh_clk);
67 goto fail;
70 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
71 if (!hcd) {
72 retval = -ENOMEM;
73 goto fail;
76 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
77 if (!res) {
78 retval = -ENODEV;
79 goto err_put_hcd;
82 hcd->rsrc_start = pdev->resource[0].start;
83 hcd->rsrc_len = resource_size(res);
85 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
86 if (IS_ERR(hcd->regs)) {
87 retval = PTR_ERR(hcd->regs);
88 goto err_put_hcd;
91 sohci_p = to_spear_ohci(hcd);
92 sohci_p->clk = usbh_clk;
94 clk_prepare_enable(sohci_p->clk);
96 ohci = hcd_to_ohci(hcd);
98 retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
99 if (retval == 0) {
100 device_wakeup_enable(hcd->self.controller);
101 return retval;
104 clk_disable_unprepare(sohci_p->clk);
105 err_put_hcd:
106 usb_put_hcd(hcd);
107 fail:
108 dev_err(&pdev->dev, "init fail, %d\n", retval);
110 return retval;
113 static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
115 struct usb_hcd *hcd = platform_get_drvdata(pdev);
116 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
118 usb_remove_hcd(hcd);
119 if (sohci_p->clk)
120 clk_disable_unprepare(sohci_p->clk);
122 usb_put_hcd(hcd);
123 return 0;
126 #if defined(CONFIG_PM)
127 static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev,
128 pm_message_t message)
130 struct usb_hcd *hcd = platform_get_drvdata(pdev);
131 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
132 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
133 bool do_wakeup = device_may_wakeup(&pdev->dev);
134 int ret;
136 if (time_before(jiffies, ohci->next_statechange))
137 msleep(5);
138 ohci->next_statechange = jiffies;
140 ret = ohci_suspend(hcd, do_wakeup);
141 if (ret)
142 return ret;
144 clk_disable_unprepare(sohci_p->clk);
146 return ret;
149 static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
151 struct usb_hcd *hcd = platform_get_drvdata(dev);
152 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
153 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
155 if (time_before(jiffies, ohci->next_statechange))
156 msleep(5);
157 ohci->next_statechange = jiffies;
159 clk_prepare_enable(sohci_p->clk);
160 ohci_resume(hcd, false);
161 return 0;
163 #endif
165 static struct of_device_id spear_ohci_id_table[] = {
166 { .compatible = "st,spear600-ohci", },
167 { },
170 /* Driver definition to register with the platform bus */
171 static struct platform_driver spear_ohci_hcd_driver = {
172 .probe = spear_ohci_hcd_drv_probe,
173 .remove = spear_ohci_hcd_drv_remove,
174 #ifdef CONFIG_PM
175 .suspend = spear_ohci_hcd_drv_suspend,
176 .resume = spear_ohci_hcd_drv_resume,
177 #endif
178 .driver = {
179 .owner = THIS_MODULE,
180 .name = "spear-ohci",
181 .of_match_table = spear_ohci_id_table,
185 static const struct ohci_driver_overrides spear_overrides __initconst = {
186 .extra_priv_size = sizeof(struct spear_ohci),
188 static int __init ohci_spear_init(void)
190 if (usb_disabled())
191 return -ENODEV;
193 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
195 ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
196 return platform_driver_register(&spear_ohci_hcd_driver);
198 module_init(ohci_spear_init);
200 static void __exit ohci_spear_cleanup(void)
202 platform_driver_unregister(&spear_ohci_hcd_driver);
204 module_exit(ohci_spear_cleanup);
206 MODULE_DESCRIPTION(DRIVER_DESC);
207 MODULE_AUTHOR("Deepak Sikri");
208 MODULE_LICENSE("GPL v2");
209 MODULE_ALIAS("platform:spear-ohci");