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 u64 spear_ehci_dma_mask = DMA_BIT_MASK(32);
  62
  63 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
  64 {
  65         struct usb_hcd *hcd ;
  66         struct spear_ehci *sehci;
  67         struct resource *res;
  68         struct clk *usbh_clk;
  69         const struct hc_driver *driver = &ehci_spear_hc_driver;
  70         int irq, retval;
  71
  72         if (usb_disabled())
  73                 return -ENODEV;
  74
  75         irq = platform_get_irq(pdev, 0);
  76         if (irq < 0) {
  77                 retval = irq;
  78                 goto fail;
  79         }
  80
  81         /*
  82          * Right now device-tree probed devices don't get dma_mask set.
  83          * Since shared usb code relies on it, set it here for now.
  84          * Once we have dma capability bindings this can go away.
  85          */
  86         if (!pdev->dev.dma_mask)
  87                 pdev->dev.dma_mask = &spear_ehci_dma_mask;
  88
  89         usbh_clk = devm_clk_get(&pdev->dev, NULL);
  90         if (IS_ERR(usbh_clk)) {
  91                 dev_err(&pdev->dev, "Error getting interface clock\n");
  92                 retval = PTR_ERR(usbh_clk);
  93                 goto fail;
  94         }
  95
  96         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  97         if (!hcd) {
  98                 retval = -ENOMEM;
  99                 goto fail;
 100         }
 101
 102         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 103         if (!res) {
 104                 retval = -ENODEV;
 105                 goto err_put_hcd;
 106         }
 107
 108         hcd->rsrc_start = res->start;
 109         hcd->rsrc_len = resource_size(res);
 110         if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len,
 111                                 driver->description)) {
 112                 retval = -EBUSY;
 113                 goto err_put_hcd;
 114         }
 115
 116         hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
 117         if (hcd->regs == NULL) {
 118                 dev_dbg(&pdev->dev, "error mapping memory\n");
 119                 retval = -ENOMEM;
 120                 goto err_put_hcd;
 121         }
 122
 123         sehci = to_spear_ehci(hcd);
 124         sehci->clk = usbh_clk;
 125
 126         /* registers start at offset 0x0 */
 127         hcd_to_ehci(hcd)->caps = hcd->regs;
 128
 129         clk_prepare_enable(sehci->clk);
 130         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 131         if (retval)
 132                 goto err_stop_ehci;
 133
 134         return retval;
 135
 136 err_stop_ehci:
 137         clk_disable_unprepare(sehci->clk);
 138 err_put_hcd:
 139         usb_put_hcd(hcd);
 140 fail:
 141         dev_err(&pdev->dev, "init fail, %d\n", retval);
 142
 143         return retval ;
 144 }
 145
 146 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
 147 {
 148         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 149         struct spear_ehci *sehci = to_spear_ehci(hcd);
 150
 151         if (!hcd)
 152                 return 0;
 153         if (in_interrupt())
 154                 BUG();
 155         usb_remove_hcd(hcd);
 156
 157         if (sehci->clk)
 158                 clk_disable_unprepare(sehci->clk);
 159         usb_put_hcd(hcd);
 160
 161         return 0;
 162 }
 163
 164 static struct of_device_id spear_ehci_id_table[] = {
 165         { .compatible = "st,spear600-ehci", },
 166         { },
 167 };
 168
 169 static struct platform_driver spear_ehci_hcd_driver = {
 170         .probe          = spear_ehci_hcd_drv_probe,
 171         .remove         = spear_ehci_hcd_drv_remove,
 172         .shutdown       = usb_hcd_platform_shutdown,
 173         .driver         = {
 174                 .name = "spear-ehci",
 175                 .bus = &platform_bus_type,
 176                 .pm = &ehci_spear_pm_ops,
 177                 .of_match_table = of_match_ptr(spear_ehci_id_table),
 178         }
 179 };
 180
 181 static const struct ehci_driver_overrides spear_overrides __initdata = {
 182         .extra_priv_size = sizeof(struct spear_ehci),
 183 };
 184
 185 static int __init ehci_spear_init(void)
 186 {
 187         if (usb_disabled())
 188                 return -ENODEV;
 189
 190         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 191
 192         ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
 193         return platform_driver_register(&spear_ehci_hcd_driver);
 194 }
 195 module_init(ehci_spear_init);
 196
 197 static void __exit ehci_spear_cleanup(void)
 198 {
 199         platform_driver_unregister(&spear_ehci_hcd_driver);
 200 }
 201 module_exit(ehci_spear_cleanup);
 202
 203 MODULE_DESCRIPTION(DRIVER_DESC);
 204 MODULE_ALIAS("platform:spear-ehci");
 205 MODULE_AUTHOR("Deepak Sikri");
 206 MODULE_LICENSE("GPL");