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 static const char hcd_name[] = "SPEAr-ehci";
  28
  29 struct spear_ehci {
  30         struct clk *clk;
  31 };
  32
  33 #define to_spear_ehci(hcd)      (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
  34
  35 static struct hc_driver __read_mostly ehci_spear_hc_driver;
  36
  37 #ifdef CONFIG_PM_SLEEP
  38 static int ehci_spear_drv_suspend(struct device *dev)
  39 {
  40         struct usb_hcd *hcd = dev_get_drvdata(dev);
  41         bool do_wakeup = device_may_wakeup(dev);
  42
  43         return ehci_suspend(hcd, do_wakeup);
  44 }
  45
  46 static int ehci_spear_drv_resume(struct device *dev)
  47 {
  48         struct usb_hcd *hcd = dev_get_drvdata(dev);
  49
  50         ehci_resume(hcd, false);
  51         return 0;
  52 }
  53 #endif /* CONFIG_PM_SLEEP */
  54
  55 static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
  56                 ehci_spear_drv_resume);
  57
  58 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
  59 {
  60         struct usb_hcd *hcd ;
  61         struct spear_ehci *sehci;
  62         struct resource *res;
  63         struct clk *usbh_clk;
  64         const struct hc_driver *driver = &ehci_spear_hc_driver;
  65         int irq, retval;
  66
  67         if (usb_disabled())
  68                 return -ENODEV;
  69
  70         irq = platform_get_irq(pdev, 0);
  71         if (irq < 0) {
  72                 retval = irq;
  73                 goto fail;
  74         }
  75
  76         /*
  77          * Right now device-tree probed devices don't get dma_mask set.
  78          * Since shared usb code relies on it, set it here for now.
  79          * Once we have dma capability bindings this can go away.
  80          */
  81         retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
  82         if (retval)
  83                 goto fail;
  84
  85         usbh_clk = devm_clk_get(&pdev->dev, NULL);
  86         if (IS_ERR(usbh_clk)) {
  87                 dev_err(&pdev->dev, "Error getting interface clock\n");
  88                 retval = PTR_ERR(usbh_clk);
  89                 goto fail;
  90         }
  91
  92         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  93         if (!hcd) {
  94                 retval = -ENOMEM;
  95                 goto fail;
  96         }
  97
  98         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  99         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 100         if (IS_ERR(hcd->regs)) {
 101                 retval = PTR_ERR(hcd->regs);
 102                 goto err_put_hcd;
 103         }
 104         hcd->rsrc_start = res->start;
 105         hcd->rsrc_len = resource_size(res);
 106
 107         sehci = to_spear_ehci(hcd);
 108         sehci->clk = usbh_clk;
 109
 110         /* registers start at offset 0x0 */
 111         hcd_to_ehci(hcd)->caps = hcd->regs;
 112
 113         clk_prepare_enable(sehci->clk);
 114         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 115         if (retval)
 116                 goto err_stop_ehci;
 117
 118         device_wakeup_enable(hcd->self.controller);
 119         return retval;
 120
 121 err_stop_ehci:
 122         clk_disable_unprepare(sehci->clk);
 123 err_put_hcd:
 124         usb_put_hcd(hcd);
 125 fail:
 126         dev_err(&pdev->dev, "init fail, %d\n", retval);
 127
 128         return retval ;
 129 }
 130
 131 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
 132 {
 133         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 134         struct spear_ehci *sehci = to_spear_ehci(hcd);
 135
 136         usb_remove_hcd(hcd);
 137
 138         if (sehci->clk)
 139                 clk_disable_unprepare(sehci->clk);
 140         usb_put_hcd(hcd);
 141
 142         return 0;
 143 }
 144
 145 static const struct of_device_id spear_ehci_id_table[] = {
 146         { .compatible = "st,spear600-ehci", },
 147         { },
 148 };
 149 MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
 150
 151 static struct platform_driver spear_ehci_hcd_driver = {
 152         .probe          = spear_ehci_hcd_drv_probe,
 153         .remove         = spear_ehci_hcd_drv_remove,
 154         .shutdown       = usb_hcd_platform_shutdown,
 155         .driver         = {
 156                 .name = "spear-ehci",
 157                 .bus = &platform_bus_type,
 158                 .pm = &ehci_spear_pm_ops,
 159                 .of_match_table = spear_ehci_id_table,
 160         }
 161 };
 162
 163 static const struct ehci_driver_overrides spear_overrides __initconst = {
 164         .extra_priv_size = sizeof(struct spear_ehci),
 165 };
 166
 167 static int __init ehci_spear_init(void)
 168 {
 169         if (usb_disabled())
 170                 return -ENODEV;
 171
 172         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 173
 174         ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
 175         return platform_driver_register(&spear_ehci_hcd_driver);
 176 }
 177 module_init(ehci_spear_init);
 178
 179 static void __exit ehci_spear_cleanup(void)
 180 {
 181         platform_driver_unregister(&spear_ehci_hcd_driver);
 182 }
 183 module_exit(ehci_spear_cleanup);
 184
 185 MODULE_DESCRIPTION(DRIVER_DESC);
 186 MODULE_ALIAS("platform:spear-ehci");
 187 MODULE_AUTHOR("Deepak Sikri");
 188 MODULE_LICENSE("GPL");