drivers/usb/host/ohci-exynos.c

   1 /*
   2  * SAMSUNG EXYNOS USB HOST OHCI Controller
   3  *
   4  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   5  * Author: Jingoo Han <jg1.han@samsung.com>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  *
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/io.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/usb/phy.h>
  22 #include <linux/usb/samsung_usb_phy.h>
  23 #include <linux/usb.h>
  24 #include <linux/usb/hcd.h>
  25 #include <linux/usb/otg.h>
  26
  27 #include "ohci.h"
  28
  29 #define DRIVER_DESC "OHCI EXYNOS driver"
  30
  31 static const char hcd_name[] = "ohci-exynos";
  32 static struct hc_driver __read_mostly exynos_ohci_hc_driver;
  33
  34 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
  35
  36 struct exynos_ohci_hcd {
  37         struct clk *clk;
  38         struct usb_phy *phy;
  39         struct usb_otg *otg;
  40 };
  41
  42 static void exynos_ohci_phy_enable(struct device *dev)
  43 {
  44         struct usb_hcd *hcd = dev_get_drvdata(dev);
  45         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
  46
  47         if (exynos_ohci->phy)
  48                 usb_phy_init(exynos_ohci->phy);
  49 }
  50
  51 static void exynos_ohci_phy_disable(struct device *dev)
  52 {
  53         struct usb_hcd *hcd = dev_get_drvdata(dev);
  54         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
  55
  56         if (exynos_ohci->phy)
  57                 usb_phy_shutdown(exynos_ohci->phy);
  58 }
  59
  60 static int exynos_ohci_probe(struct platform_device *pdev)
  61 {
  62         struct exynos_ohci_hcd *exynos_ohci;
  63         struct usb_hcd *hcd;
  64         struct resource *res;
  65         struct usb_phy *phy;
  66         int irq;
  67         int err;
  68
  69         /*
  70          * Right now device-tree probed devices don't get dma_mask set.
  71          * Since shared usb code relies on it, set it here for now.
  72          * Once we move to full device tree support this will vanish off.
  73          */
  74         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
  75         if (err)
  76                 return err;
  77
  78         hcd = usb_create_hcd(&exynos_ohci_hc_driver,
  79                                 &pdev->dev, dev_name(&pdev->dev));
  80         if (!hcd) {
  81                 dev_err(&pdev->dev, "Unable to create HCD\n");
  82                 return -ENOMEM;
  83         }
  84
  85         exynos_ohci = to_exynos_ohci(hcd);
  86
  87         if (of_device_is_compatible(pdev->dev.of_node,
  88                                         "samsung,exynos5440-ohci"))
  89                 goto skip_phy;
  90
  91         phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
  92         if (IS_ERR(phy)) {
  93                 usb_put_hcd(hcd);
  94                 dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
  95                 return -EPROBE_DEFER;
  96         } else {
  97                 exynos_ohci->phy = phy;
  98                 exynos_ohci->otg = phy->otg;
  99         }
 100
 101 skip_phy:
 102         exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
 103
 104         if (IS_ERR(exynos_ohci->clk)) {
 105                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 106                 err = PTR_ERR(exynos_ohci->clk);
 107                 goto fail_clk;
 108         }
 109
 110         err = clk_prepare_enable(exynos_ohci->clk);
 111         if (err)
 112                 goto fail_clk;
 113
 114         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 115         if (!res) {
 116                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 117                 err = -ENXIO;
 118                 goto fail_io;
 119         }
 120
 121         hcd->rsrc_start = res->start;
 122         hcd->rsrc_len = resource_size(res);
 123         hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
 124         if (!hcd->regs) {
 125                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 126                 err = -ENOMEM;
 127                 goto fail_io;
 128         }
 129
 130         irq = platform_get_irq(pdev, 0);
 131         if (!irq) {
 132                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 133                 err = -ENODEV;
 134                 goto fail_io;
 135         }
 136
 137         if (exynos_ohci->otg)
 138                 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
 139
 140         platform_set_drvdata(pdev, hcd);
 141
 142         exynos_ohci_phy_enable(&pdev->dev);
 143
 144         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 145         if (err) {
 146                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 147                 goto fail_add_hcd;
 148         }
 149         device_wakeup_enable(hcd->self.controller);
 150         return 0;
 151
 152 fail_add_hcd:
 153         exynos_ohci_phy_disable(&pdev->dev);
 154 fail_io:
 155         clk_disable_unprepare(exynos_ohci->clk);
 156 fail_clk:
 157         usb_put_hcd(hcd);
 158         return err;
 159 }
 160
 161 static int exynos_ohci_remove(struct platform_device *pdev)
 162 {
 163         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 164         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 165
 166         usb_remove_hcd(hcd);
 167
 168         if (exynos_ohci->otg)
 169                 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
 170
 171         exynos_ohci_phy_disable(&pdev->dev);
 172
 173         clk_disable_unprepare(exynos_ohci->clk);
 174
 175         usb_put_hcd(hcd);
 176
 177         return 0;
 178 }
 179
 180 static void exynos_ohci_shutdown(struct platform_device *pdev)
 181 {
 182         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 183
 184         if (hcd->driver->shutdown)
 185                 hcd->driver->shutdown(hcd);
 186 }
 187
 188 #ifdef CONFIG_PM
 189 static int exynos_ohci_suspend(struct device *dev)
 190 {
 191         struct usb_hcd *hcd = dev_get_drvdata(dev);
 192         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 193         bool do_wakeup = device_may_wakeup(dev);
 194         int rc = ohci_suspend(hcd, do_wakeup);
 195
 196         if (rc)
 197                 return rc;
 198
 199         if (exynos_ohci->otg)
 200                 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
 201
 202         exynos_ohci_phy_disable(dev);
 203
 204         clk_disable_unprepare(exynos_ohci->clk);
 205
 206         return 0;
 207 }
 208
 209 static int exynos_ohci_resume(struct device *dev)
 210 {
 211         struct usb_hcd *hcd                     = dev_get_drvdata(dev);
 212         struct exynos_ohci_hcd *exynos_ohci     = to_exynos_ohci(hcd);
 213
 214         clk_prepare_enable(exynos_ohci->clk);
 215
 216         if (exynos_ohci->otg)
 217                 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
 218
 219         exynos_ohci_phy_enable(dev);
 220
 221         ohci_resume(hcd, false);
 222
 223         return 0;
 224 }
 225 #else
 226 #define exynos_ohci_suspend     NULL
 227 #define exynos_ohci_resume      NULL
 228 #endif
 229
 230 static const struct ohci_driver_overrides exynos_overrides __initconst = {
 231         .extra_priv_size =      sizeof(struct exynos_ohci_hcd),
 232 };
 233
 234 static const struct dev_pm_ops exynos_ohci_pm_ops = {
 235         .suspend        = exynos_ohci_suspend,
 236         .resume         = exynos_ohci_resume,
 237 };
 238
 239 #ifdef CONFIG_OF
 240 static const struct of_device_id exynos_ohci_match[] = {
 241         { .compatible = "samsung,exynos4210-ohci" },
 242         { .compatible = "samsung,exynos5440-ohci" },
 243         {},
 244 };
 245 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
 246 #endif
 247
 248 static struct platform_driver exynos_ohci_driver = {
 249         .probe          = exynos_ohci_probe,
 250         .remove         = exynos_ohci_remove,
 251         .shutdown       = exynos_ohci_shutdown,
 252         .driver = {
 253                 .name   = "exynos-ohci",
 254                 .owner  = THIS_MODULE,
 255                 .pm     = &exynos_ohci_pm_ops,
 256                 .of_match_table = of_match_ptr(exynos_ohci_match),
 257         }
 258 };
 259 static int __init ohci_exynos_init(void)
 260 {
 261         if (usb_disabled())
 262                 return -ENODEV;
 263
 264         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 265         ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
 266         return platform_driver_register(&exynos_ohci_driver);
 267 }
 268 module_init(ohci_exynos_init);
 269
 270 static void __exit ohci_exynos_cleanup(void)
 271 {
 272         platform_driver_unregister(&exynos_ohci_driver);
 273 }
 274 module_exit(ohci_exynos_cleanup);
 275
 276 MODULE_ALIAS("platform:exynos-ohci");
 277 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 278 MODULE_LICENSE("GPL v2");