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Linux/drivers/usb/host/ehci-spear.c

  1 /*
  2 * Driver for EHCI HCD on SPEAr SOC
  3 *
  4 * Copyright (C) 2010 ST Micro Electronics,
  5 * Deepak Sikri <deepak.sikri@st.com>
  6 *
  7 * Based on various ehci-*.c drivers
  8 *
  9 * This file is subject to the terms and conditions of the GNU General Public
 10 * License. See the file COPYING in the main directory of this archive for
 11 * more details.
 12 */
 13 
 14 #include <linux/clk.h>
 15 #include <linux/dma-mapping.h>
 16 #include <linux/io.h>
 17 #include <linux/jiffies.h>
 18 #include <linux/kernel.h>
 19 #include <linux/module.h>
 20 #include <linux/of.h>
 21 #include <linux/platform_device.h>
 22 #include <linux/pm.h>
 23 #include <linux/usb.h>
 24 #include <linux/usb/hcd.h>
 25 
 26 #include "ehci.h"
 27 
 28 #define DRIVER_DESC "EHCI SPEAr driver"
 29 
 30 static const char hcd_name[] = "SPEAr-ehci";
 31 
 32 struct spear_ehci {
 33         struct clk *clk;
 34 };
 35 
 36 #define to_spear_ehci(hcd)      (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
 37 
 38 static struct hc_driver __read_mostly ehci_spear_hc_driver;
 39 
 40 #ifdef CONFIG_PM_SLEEP
 41 static int ehci_spear_drv_suspend(struct device *dev)
 42 {
 43         struct usb_hcd *hcd = dev_get_drvdata(dev);
 44         bool do_wakeup = device_may_wakeup(dev);
 45 
 46         return ehci_suspend(hcd, do_wakeup);
 47 }
 48 
 49 static int ehci_spear_drv_resume(struct device *dev)
 50 {
 51         struct usb_hcd *hcd = dev_get_drvdata(dev);
 52 
 53         ehci_resume(hcd, false);
 54         return 0;
 55 }
 56 #endif /* CONFIG_PM_SLEEP */
 57 
 58 static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
 59                 ehci_spear_drv_resume);
 60 
 61 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
 62 {
 63         struct usb_hcd *hcd ;
 64         struct spear_ehci *sehci;
 65         struct resource *res;
 66         struct clk *usbh_clk;
 67         const struct hc_driver *driver = &ehci_spear_hc_driver;
 68         int irq, retval;
 69 
 70         if (usb_disabled())
 71                 return -ENODEV;
 72 
 73         irq = platform_get_irq(pdev, 0);
 74         if (irq < 0) {
 75                 retval = irq;
 76                 goto fail;
 77         }
 78 
 79         /*
 80          * Right now device-tree probed devices don't get dma_mask set.
 81          * Since shared usb code relies on it, set it here for now.
 82          * Once we have dma capability bindings this can go away.
 83          */
 84         retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 85         if (retval)
 86                 goto fail;
 87 
 88         usbh_clk = devm_clk_get(&pdev->dev, NULL);
 89         if (IS_ERR(usbh_clk)) {
 90                 dev_err(&pdev->dev, "Error getting interface clock\n");
 91                 retval = PTR_ERR(usbh_clk);
 92                 goto fail;
 93         }
 94 
 95         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 96         if (!hcd) {
 97                 retval = -ENOMEM;
 98                 goto fail;
 99         }
100 
101         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
102         if (!res) {
103                 retval = -ENODEV;
104                 goto err_put_hcd;
105         }
106 
107         hcd->rsrc_start = res->start;
108         hcd->rsrc_len = resource_size(res);
109         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
110         if (IS_ERR(hcd->regs)) {
111                 retval = PTR_ERR(hcd->regs);
112                 goto err_put_hcd;
113         }
114 
115         sehci = to_spear_ehci(hcd);
116         sehci->clk = usbh_clk;
117 
118         /* registers start at offset 0x0 */
119         hcd_to_ehci(hcd)->caps = hcd->regs;
120 
121         clk_prepare_enable(sehci->clk);
122         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
123         if (retval)
124                 goto err_stop_ehci;
125 
126         device_wakeup_enable(hcd->self.controller);
127         return retval;
128 
129 err_stop_ehci:
130         clk_disable_unprepare(sehci->clk);
131 err_put_hcd:
132         usb_put_hcd(hcd);
133 fail:
134         dev_err(&pdev->dev, "init fail, %d\n", retval);
135 
136         return retval ;
137 }
138 
139 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
140 {
141         struct usb_hcd *hcd = platform_get_drvdata(pdev);
142         struct spear_ehci *sehci = to_spear_ehci(hcd);
143 
144         usb_remove_hcd(hcd);
145 
146         if (sehci->clk)
147                 clk_disable_unprepare(sehci->clk);
148         usb_put_hcd(hcd);
149 
150         return 0;
151 }
152 
153 static const struct of_device_id spear_ehci_id_table[] = {
154         { .compatible = "st,spear600-ehci", },
155         { },
156 };
157 
158 static struct platform_driver spear_ehci_hcd_driver = {
159         .probe          = spear_ehci_hcd_drv_probe,
160         .remove         = spear_ehci_hcd_drv_remove,
161         .shutdown       = usb_hcd_platform_shutdown,
162         .driver         = {
163                 .name = "spear-ehci",
164                 .bus = &platform_bus_type,
165                 .pm = &ehci_spear_pm_ops,
166                 .of_match_table = spear_ehci_id_table,
167         }
168 };
169 
170 static const struct ehci_driver_overrides spear_overrides __initdata = {
171         .extra_priv_size = sizeof(struct spear_ehci),
172 };
173 
174 static int __init ehci_spear_init(void)
175 {
176         if (usb_disabled())
177                 return -ENODEV;
178 
179         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
180 
181         ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
182         return platform_driver_register(&spear_ehci_hcd_driver);
183 }
184 module_init(ehci_spear_init);
185 
186 static void __exit ehci_spear_cleanup(void)
187 {
188         platform_driver_unregister(&spear_ehci_hcd_driver);
189 }
190 module_exit(ehci_spear_cleanup);
191 
192 MODULE_DESCRIPTION(DRIVER_DESC);
193 MODULE_ALIAS("platform:spear-ehci");
194 MODULE_AUTHOR("Deepak Sikri");
195 MODULE_LICENSE("GPL");
196 

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