kernel/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         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 103         if (IS_ERR(hcd->regs)) {
 104                 retval = PTR_ERR(hcd->regs);
 105                 goto err_put_hcd;
 106         }
 107         hcd->rsrc_start = res->start;
 108         hcd->rsrc_len = resource_size(res);
 109
 110         sehci = to_spear_ehci(hcd);
 111         sehci->clk = usbh_clk;
 112
 113         /* registers start at offset 0x0 */
 114         hcd_to_ehci(hcd)->caps = hcd->regs;
 115
 116         clk_prepare_enable(sehci->clk);
 117         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 118         if (retval)
 119                 goto err_stop_ehci;
 120
 121         device_wakeup_enable(hcd->self.controller);
 122         return retval;
 123
 124 err_stop_ehci:
 125         clk_disable_unprepare(sehci->clk);
 126 err_put_hcd:
 127         usb_put_hcd(hcd);
 128 fail:
 129         dev_err(&pdev->dev, "init fail, %d\n", retval);
 130
 131         return retval ;
 132 }
 133
 134 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
 135 {
 136         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 137         struct spear_ehci *sehci = to_spear_ehci(hcd);
 138
 139         usb_remove_hcd(hcd);
 140
 141         if (sehci->clk)
 142                 clk_disable_unprepare(sehci->clk);
 143         usb_put_hcd(hcd);
 144
 145         return 0;
 146 }
 147
 148 static const struct of_device_id spear_ehci_id_table[] = {
 149         { .compatible = "st,spear600-ehci", },
 150         { },
 151 };
 152
 153 static struct platform_driver spear_ehci_hcd_driver = {
 154         .probe          = spear_ehci_hcd_drv_probe,
 155         .remove         = spear_ehci_hcd_drv_remove,
 156         .shutdown       = usb_hcd_platform_shutdown,
 157         .driver         = {
 158                 .name = "spear-ehci",
 159                 .bus = &platform_bus_type,
 160                 .pm = &ehci_spear_pm_ops,
 161                 .of_match_table = spear_ehci_id_table,
 162         }
 163 };
 164
 165 static const struct ehci_driver_overrides spear_overrides __initdata = {
 166         .extra_priv_size = sizeof(struct spear_ehci),
 167 };
 168
 169 static int __init ehci_spear_init(void)
 170 {
 171         if (usb_disabled())
 172                 return -ENODEV;
 173
 174         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 175
 176         ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
 177         return platform_driver_register(&spear_ehci_hcd_driver);
 178 }
 179 module_init(ehci_spear_init);
 180
 181 static void __exit ehci_spear_cleanup(void)
 182 {
 183         platform_driver_unregister(&spear_ehci_hcd_driver);
 184 }
 185 module_exit(ehci_spear_cleanup);
 186
 187 MODULE_DESCRIPTION(DRIVER_DESC);
 188 MODULE_ALIAS("platform:spear-ehci");
 189 MODULE_AUTHOR("Deepak Sikri");
 190 MODULE_LICENSE("GPL");