drivers/usb/host/ehci-spear.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3 * Driver for EHCI HCD on SPEAr SOC
   4 *
   5 * Copyright (C) 2010 ST Micro Electronics,
   6 * Deepak Sikri <[email protected]>
   7 *
   8 * Based on various ehci-*.c drivers
   9 */
  10
  11 #include <linux/clk.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/io.h>
  14 #include <linux/jiffies.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/pm.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/hcd.h>
  22
  23 #include "ehci.h"
  24
  25 #define DRIVER_DESC "EHCI SPEAr driver"
  26
  27 struct spear_ehci {
  28         struct clk *clk;
  29 };
  30
  31 #define to_spear_ehci(hcd)      (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
  32
  33 static struct hc_driver __read_mostly ehci_spear_hc_driver;
  34
  35 static int __maybe_unused ehci_spear_drv_suspend(struct device *dev)
  36 {
  37         struct usb_hcd *hcd = dev_get_drvdata(dev);
  38         bool do_wakeup = device_may_wakeup(dev);
  39
  40         return ehci_suspend(hcd, do_wakeup);
  41 }
  42
  43 static int __maybe_unused ehci_spear_drv_resume(struct device *dev)
  44 {
  45         struct usb_hcd *hcd = dev_get_drvdata(dev);
  46
  47         ehci_resume(hcd, false);
  48         return 0;
  49 }
  50
  51 static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
  52                 ehci_spear_drv_resume);
  53
  54 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
  55 {
  56         struct usb_hcd *hcd ;
  57         struct spear_ehci *sehci;
  58         struct resource *res;
  59         struct clk *usbh_clk;
  60         const struct hc_driver *driver = &ehci_spear_hc_driver;
  61         int irq, retval;
  62
  63         if (usb_disabled())
  64                 return -ENODEV;
  65
  66         irq = platform_get_irq(pdev, 0);
  67         if (irq < 0) {
  68                 retval = irq;
  69                 goto fail;
  70         }
  71
  72         /*
  73          * Right now device-tree probed devices don't get dma_mask set.
  74          * Since shared usb code relies on it, set it here for now.
  75          * Once we have dma capability bindings this can go away.
  76          */
  77         retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
  78         if (retval)
  79                 goto fail;
  80
  81         usbh_clk = devm_clk_get(&pdev->dev, NULL);
  82         if (IS_ERR(usbh_clk)) {
  83                 dev_err(&pdev->dev, "Error getting interface clock\n");
  84                 retval = PTR_ERR(usbh_clk);
  85                 goto fail;
  86         }
  87
  88         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  89         if (!hcd) {
  90                 retval = -ENOMEM;
  91                 goto fail;
  92         }
  93
  94         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  95         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
  96         if (IS_ERR(hcd->regs)) {
  97                 retval = PTR_ERR(hcd->regs);
  98                 goto err_put_hcd;
  99         }
 100         hcd->rsrc_start = res->start;
 101         hcd->rsrc_len = resource_size(res);
 102
 103         sehci = to_spear_ehci(hcd);
 104         sehci->clk = usbh_clk;
 105
 106         /* registers start at offset 0x0 */
 107         hcd_to_ehci(hcd)->caps = hcd->regs;
 108
 109         clk_prepare_enable(sehci->clk);
 110         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 111         if (retval)
 112                 goto err_stop_ehci;
 113
 114         device_wakeup_enable(hcd->self.controller);
 115         return retval;
 116
 117 err_stop_ehci:
 118         clk_disable_unprepare(sehci->clk);
 119 err_put_hcd:
 120         usb_put_hcd(hcd);
 121 fail:
 122         dev_err(&pdev->dev, "init fail, %d\n", retval);
 123
 124         return retval ;
 125 }
 126
 127 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
 128 {
 129         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 130         struct spear_ehci *sehci = to_spear_ehci(hcd);
 131
 132         usb_remove_hcd(hcd);
 133
 134         if (sehci->clk)
 135                 clk_disable_unprepare(sehci->clk);
 136         usb_put_hcd(hcd);
 137
 138         return 0;
 139 }
 140
 141 static const struct of_device_id spear_ehci_id_table[] = {
 142         { .compatible = "st,spear600-ehci", },
 143         { },
 144 };
 145 MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
 146
 147 static struct platform_driver spear_ehci_hcd_driver = {
 148         .probe          = spear_ehci_hcd_drv_probe,
 149         .remove         = spear_ehci_hcd_drv_remove,
 150         .shutdown       = usb_hcd_platform_shutdown,
 151         .driver         = {
 152                 .name = "spear-ehci",
 153                 .bus = &platform_bus_type,
 154                 .pm = pm_ptr(&ehci_spear_pm_ops),
 155                 .of_match_table = spear_ehci_id_table,
 156         }
 157 };
 158
 159 static const struct ehci_driver_overrides spear_overrides __initconst = {
 160         .extra_priv_size = sizeof(struct spear_ehci),
 161 };
 162
 163 static int __init ehci_spear_init(void)
 164 {
 165         if (usb_disabled())
 166                 return -ENODEV;
 167
 168         ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
 169         return platform_driver_register(&spear_ehci_hcd_driver);
 170 }
 171 module_init(ehci_spear_init);
 172
 173 static void __exit ehci_spear_cleanup(void)
 174 {
 175         platform_driver_unregister(&spear_ehci_hcd_driver);
 176 }
 177 module_exit(ehci_spear_cleanup);
 178
 179 MODULE_DESCRIPTION(DRIVER_DESC);
 180 MODULE_ALIAS("platform:spear-ehci");
 181 MODULE_AUTHOR("Deepak Sikri");
 182 MODULE_LICENSE("GPL");