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         if (!pdev->dev.dma_mask)
  85                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
  86         retval = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
  87         if (retval)
  88                 goto fail;
  89
  90         usbh_clk = devm_clk_get(&pdev->dev, NULL);
  91         if (IS_ERR(usbh_clk)) {
  92                 dev_err(&pdev->dev, "Error getting interface clock\n");
  93                 retval = PTR_ERR(usbh_clk);
  94                 goto fail;
  95         }
  96
  97         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  98         if (!hcd) {
  99                 retval = -ENOMEM;
 100                 goto fail;
 101         }
 102
 103         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 104         if (!res) {
 105                 retval = -ENODEV;
 106                 goto err_put_hcd;
 107         }
 108
 109         hcd->rsrc_start = res->start;
 110         hcd->rsrc_len = resource_size(res);
 111         if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len,
 112                                 driver->description)) {
 113                 retval = -EBUSY;
 114                 goto err_put_hcd;
 115         }
 116
 117         hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
 118         if (hcd->regs == NULL) {
 119                 dev_dbg(&pdev->dev, "error mapping memory\n");
 120                 retval = -ENOMEM;
 121                 goto err_put_hcd;
 122         }
 123
 124         sehci = to_spear_ehci(hcd);
 125         sehci->clk = usbh_clk;
 126
 127         /* registers start at offset 0x0 */
 128         hcd_to_ehci(hcd)->caps = hcd->regs;
 129
 130         clk_prepare_enable(sehci->clk);
 131         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 132         if (retval)
 133                 goto err_stop_ehci;
 134
 135         return retval;
 136
 137 err_stop_ehci:
 138         clk_disable_unprepare(sehci->clk);
 139 err_put_hcd:
 140         usb_put_hcd(hcd);
 141 fail:
 142         dev_err(&pdev->dev, "init fail, %d\n", retval);
 143
 144         return retval ;
 145 }
 146
 147 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
 148 {
 149         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 150         struct spear_ehci *sehci = to_spear_ehci(hcd);
 151
 152         usb_remove_hcd(hcd);
 153
 154         if (sehci->clk)
 155                 clk_disable_unprepare(sehci->clk);
 156         usb_put_hcd(hcd);
 157
 158         return 0;
 159 }
 160
 161 static struct of_device_id spear_ehci_id_table[] = {
 162         { .compatible = "st,spear600-ehci", },
 163         { },
 164 };
 165
 166 static struct platform_driver spear_ehci_hcd_driver = {
 167         .probe          = spear_ehci_hcd_drv_probe,
 168         .remove         = spear_ehci_hcd_drv_remove,
 169         .shutdown       = usb_hcd_platform_shutdown,
 170         .driver         = {
 171                 .name = "spear-ehci",
 172                 .bus = &platform_bus_type,
 173                 .pm = &ehci_spear_pm_ops,
 174                 .of_match_table = spear_ehci_id_table,
 175         }
 176 };
 177
 178 static const struct ehci_driver_overrides spear_overrides __initdata = {
 179         .extra_priv_size = sizeof(struct spear_ehci),
 180 };
 181
 182 static int __init ehci_spear_init(void)
 183 {
 184         if (usb_disabled())
 185                 return -ENODEV;
 186
 187         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 188
 189         ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
 190         return platform_driver_register(&spear_ehci_hcd_driver);
 191 }
 192 module_init(ehci_spear_init);
 193
 194 static void __exit ehci_spear_cleanup(void)
 195 {
 196         platform_driver_unregister(&spear_ehci_hcd_driver);
 197 }
 198 module_exit(ehci_spear_cleanup);
 199
 200 MODULE_DESCRIPTION(DRIVER_DESC);
 201 MODULE_ALIAS("platform:spear-ehci");
 202 MODULE_AUTHOR("Deepak Sikri");
 203 MODULE_LICENSE("GPL");