drivers/usb/host/ehci-mxc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   4  * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/io.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/clk.h>
  12 #include <linux/delay.h>
  13 #include <linux/usb/otg.h>
  14 #include <linux/usb/ulpi.h>
  15 #include <linux/slab.h>
  16 #include <linux/usb.h>
  17 #include <linux/usb/hcd.h>
  18 #include <linux/platform_data/usb-ehci-mxc.h>
  19 #include "ehci.h"
  20
  21 #define DRIVER_DESC "Freescale On-Chip EHCI Host driver"
  22
  23 static const char hcd_name[] = "ehci-mxc";
  24
  25 #define ULPI_VIEWPORT_OFFSET    0x170
  26
  27 struct ehci_mxc_priv {
  28         struct clk *usbclk, *ahbclk, *phyclk;
  29 };
  30
  31 static struct hc_driver __read_mostly ehci_mxc_hc_driver;
  32
  33 static const struct ehci_driver_overrides ehci_mxc_overrides __initconst = {
  34         .extra_priv_size =      sizeof(struct ehci_mxc_priv),
  35 };
  36
  37 static int ehci_mxc_drv_probe(struct platform_device *pdev)
  38 {
  39         struct device *dev = &pdev->dev;
  40         struct mxc_usbh_platform_data *pdata = dev_get_platdata(dev);
  41         struct usb_hcd *hcd;
  42         struct resource *res;
  43         int irq, ret;
  44         struct ehci_mxc_priv *priv;
  45         struct ehci_hcd *ehci;
  46
  47         if (!pdata) {
  48                 dev_err(dev, "No platform data given, bailing out.\n");
  49                 return -EINVAL;
  50         }
  51
  52         irq = platform_get_irq(pdev, 0);
  53         if (irq < 0)
  54                 return irq;
  55
  56         hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
  57         if (!hcd)
  58                 return -ENOMEM;
  59
  60         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  61         hcd->regs = devm_ioremap_resource(dev, res);
  62         if (IS_ERR(hcd->regs)) {
  63                 ret = PTR_ERR(hcd->regs);
  64                 goto err_alloc;
  65         }
  66         hcd->rsrc_start = res->start;
  67         hcd->rsrc_len = resource_size(res);
  68
  69         hcd->has_tt = 1;
  70         ehci = hcd_to_ehci(hcd);
  71         priv = (struct ehci_mxc_priv *) ehci->priv;
  72
  73         /* enable clocks */
  74         priv->usbclk = devm_clk_get(dev, "ipg");
  75         if (IS_ERR(priv->usbclk)) {
  76                 ret = PTR_ERR(priv->usbclk);
  77                 goto err_alloc;
  78         }
  79         clk_prepare_enable(priv->usbclk);
  80
  81         priv->ahbclk = devm_clk_get(dev, "ahb");
  82         if (IS_ERR(priv->ahbclk)) {
  83                 ret = PTR_ERR(priv->ahbclk);
  84                 goto err_clk_ahb;
  85         }
  86         clk_prepare_enable(priv->ahbclk);
  87
  88         /* "dr" device has its own clock on i.MX51 */
  89         priv->phyclk = devm_clk_get(dev, "phy");
  90         if (IS_ERR(priv->phyclk))
  91                 priv->phyclk = NULL;
  92         if (priv->phyclk)
  93                 clk_prepare_enable(priv->phyclk);
  94
  95         /* call platform specific init function */
  96         if (pdata->init) {
  97                 ret = pdata->init(pdev);
  98                 if (ret) {
  99                         dev_err(dev, "platform init failed\n");
 100                         goto err_init;
 101                 }
 102                 /* platforms need some time to settle changed IO settings */
 103                 mdelay(10);
 104         }
 105
 106         /* EHCI registers start at offset 0x100 */
 107         ehci->caps = hcd->regs + 0x100;
 108         ehci->regs = hcd->regs + 0x100 +
 109                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 110
 111         /* set up the PORTSCx register */
 112         ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
 113
 114         /* is this really needed? */
 115         msleep(10);
 116
 117         /* Initialize the transceiver */
 118         if (pdata->otg) {
 119                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
 120                 ret = usb_phy_init(pdata->otg);
 121                 if (ret) {
 122                         dev_err(dev, "unable to init transceiver, probably missing\n");
 123                         ret = -ENODEV;
 124                         goto err_add;
 125                 }
 126                 ret = otg_set_vbus(pdata->otg->otg, 1);
 127                 if (ret) {
 128                         dev_err(dev, "unable to enable vbus on transceiver\n");
 129                         goto err_add;
 130                 }
 131         }
 132
 133         platform_set_drvdata(pdev, hcd);
 134
 135         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 136         if (ret)
 137                 goto err_add;
 138
 139         device_wakeup_enable(hcd->self.controller);
 140         return 0;
 141
 142 err_add:
 143         if (pdata && pdata->exit)
 144                 pdata->exit(pdev);
 145 err_init:
 146         if (priv->phyclk)
 147                 clk_disable_unprepare(priv->phyclk);
 148
 149         clk_disable_unprepare(priv->ahbclk);
 150 err_clk_ahb:
 151         clk_disable_unprepare(priv->usbclk);
 152 err_alloc:
 153         usb_put_hcd(hcd);
 154         return ret;
 155 }
 156
 157 static int ehci_mxc_drv_remove(struct platform_device *pdev)
 158 {
 159         struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
 160         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 161         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 162         struct ehci_mxc_priv *priv = (struct ehci_mxc_priv *) ehci->priv;
 163
 164         usb_remove_hcd(hcd);
 165
 166         if (pdata && pdata->exit)
 167                 pdata->exit(pdev);
 168
 169         if (pdata && pdata->otg)
 170                 usb_phy_shutdown(pdata->otg);
 171
 172         clk_disable_unprepare(priv->usbclk);
 173         clk_disable_unprepare(priv->ahbclk);
 174
 175         if (priv->phyclk)
 176                 clk_disable_unprepare(priv->phyclk);
 177
 178         usb_put_hcd(hcd);
 179         return 0;
 180 }
 181
 182 MODULE_ALIAS("platform:mxc-ehci");
 183
 184 static struct platform_driver ehci_mxc_driver = {
 185         .probe = ehci_mxc_drv_probe,
 186         .remove = ehci_mxc_drv_remove,
 187         .shutdown = usb_hcd_platform_shutdown,
 188         .driver = {
 189                    .name = "mxc-ehci",
 190         },
 191 };
 192
 193 static int __init ehci_mxc_init(void)
 194 {
 195         if (usb_disabled())
 196                 return -ENODEV;
 197
 198         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 199
 200         ehci_init_driver(&ehci_mxc_hc_driver, &ehci_mxc_overrides);
 201         return platform_driver_register(&ehci_mxc_driver);
 202 }
 203 module_init(ehci_mxc_init);
 204
 205 static void __exit ehci_mxc_cleanup(void)
 206 {
 207         platform_driver_unregister(&ehci_mxc_driver);
 208 }
 209 module_exit(ehci_mxc_cleanup);
 210
 211 MODULE_DESCRIPTION(DRIVER_DESC);
 212 MODULE_AUTHOR("Sascha Hauer");
 213 MODULE_LICENSE("GPL");