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 <deepak.sikri@st.com>
   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         hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
  95         if (IS_ERR(hcd->regs)) {
  96                 retval = PTR_ERR(hcd->regs);
  97                 goto err_put_hcd;
  98         }
  99         hcd->rsrc_start = res->start;
 100         hcd->rsrc_len = resource_size(res);
 101
 102         sehci = to_spear_ehci(hcd);
 103         sehci->clk = usbh_clk;
 104
 105         /* registers start at offset 0x0 */
 106         hcd_to_ehci(hcd)->caps = hcd->regs;
 107
 108         retval = clk_prepare_enable(sehci->clk);
 109         if (retval)
 110                 goto err_put_hcd;
 111         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 112         if (retval)
 113                 goto err_stop_ehci;
 114
 115         device_wakeup_enable(hcd->self.controller);
 116         return retval;
 117
 118 err_stop_ehci:
 119         clk_disable_unprepare(sehci->clk);
 120 err_put_hcd:
 121         usb_put_hcd(hcd);
 122 fail:
 123         dev_err(&pdev->dev, "init fail, %d\n", retval);
 124
 125         return retval ;
 126 }
 127
 128 static void spear_ehci_hcd_drv_remove(struct platform_device *pdev)
 129 {
 130         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 131         struct spear_ehci *sehci = to_spear_ehci(hcd);
 132
 133         usb_remove_hcd(hcd);
 134
 135         clk_disable_unprepare(sehci->clk);
 136         usb_put_hcd(hcd);
 137 }
 138
 139 static const struct of_device_id spear_ehci_id_table[] = {
 140         { .compatible = "st,spear600-ehci", },
 141         { },
 142 };
 143 MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
 144
 145 static struct platform_driver spear_ehci_hcd_driver = {
 146         .probe          = spear_ehci_hcd_drv_probe,
 147         .remove         = spear_ehci_hcd_drv_remove,
 148         .shutdown       = usb_hcd_platform_shutdown,
 149         .driver         = {
 150                 .name = "spear-ehci",
 151                 .bus = &platform_bus_type,
 152                 .pm = pm_ptr(&ehci_spear_pm_ops),
 153                 .of_match_table = spear_ehci_id_table,
 154         }
 155 };
 156
 157 static const struct ehci_driver_overrides spear_overrides __initconst = {
 158         .extra_priv_size = sizeof(struct spear_ehci),
 159 };
 160
 161 static int __init ehci_spear_init(void)
 162 {
 163         if (usb_disabled())
 164                 return -ENODEV;
 165
 166         ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
 167         return platform_driver_register(&spear_ehci_hcd_driver);
 168 }
 169 module_init(ehci_spear_init);
 170
 171 static void __exit ehci_spear_cleanup(void)
 172 {
 173         platform_driver_unregister(&spear_ehci_hcd_driver);
 174 }
 175 module_exit(ehci_spear_cleanup);
 176
 177 MODULE_DESCRIPTION(DRIVER_DESC);
 178 MODULE_ALIAS("platform:spear-ehci");
 179 MODULE_AUTHOR("Deepak Sikri");
 180 MODULE_LICENSE("GPL");