kernel/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/phy/phy.h>
  22 #include <linux/usb.h>
  23 #include <linux/usb/hcd.h>
  24
  25 #include "ohci.h"
  26
  27 #define DRIVER_DESC "OHCI EXYNOS driver"
  28
  29 static const char hcd_name[] = "ohci-exynos";
  30 static struct hc_driver __read_mostly exynos_ohci_hc_driver;
  31
  32 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
  33
  34 #define PHY_NUMBER 3
  35
  36 struct exynos_ohci_hcd {
  37         struct clk *clk;
  38         struct phy *phy[PHY_NUMBER];
  39 };
  40
  41 static int exynos_ohci_get_phy(struct device *dev,
  42                                 struct exynos_ohci_hcd *exynos_ohci)
  43 {
  44         struct device_node *child;
  45         struct phy *phy;
  46         int phy_number;
  47         int ret;
  48
  49         /* Get PHYs for the controller */
  50         for_each_available_child_of_node(dev->of_node, child) {
  51                 ret = of_property_read_u32(child, "reg", &phy_number);
  52                 if (ret) {
  53                         dev_err(dev, "Failed to parse device tree\n");
  54                         of_node_put(child);
  55                         return ret;
  56                 }
  57
  58                 if (phy_number >= PHY_NUMBER) {
  59                         dev_err(dev, "Invalid number of PHYs\n");
  60                         of_node_put(child);
  61                         return -EINVAL;
  62                 }
  63
  64                 phy = devm_of_phy_get(dev, child, NULL);
  65                 exynos_ohci->phy[phy_number] = phy;
  66                 if (IS_ERR(phy)) {
  67                         ret = PTR_ERR(phy);
  68                         if (ret == -EPROBE_DEFER) {
  69                                 return ret;
  70                         } else if (ret != -ENOSYS && ret != -ENODEV) {
  71                                 dev_err(dev,
  72                                         "Error retrieving usb2 phy: %d\n", ret);
  73                                 return ret;
  74                         }
  75                 }
  76         }
  77
  78         return 0;
  79 }
  80
  81 static int exynos_ohci_phy_enable(struct device *dev)
  82 {
  83         struct usb_hcd *hcd = dev_get_drvdata(dev);
  84         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
  85         int i;
  86         int ret = 0;
  87
  88         for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
  89                 if (!IS_ERR(exynos_ohci->phy[i]))
  90                         ret = phy_power_on(exynos_ohci->phy[i]);
  91         if (ret)
  92                 for (i--; i >= 0; i--)
  93                         if (!IS_ERR(exynos_ohci->phy[i]))
  94                                 phy_power_off(exynos_ohci->phy[i]);
  95
  96         return ret;
  97 }
  98
  99 static void exynos_ohci_phy_disable(struct device *dev)
 100 {
 101         struct usb_hcd *hcd = dev_get_drvdata(dev);
 102         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 103         int i;
 104
 105         for (i = 0; i < PHY_NUMBER; i++)
 106                 if (!IS_ERR(exynos_ohci->phy[i]))
 107                         phy_power_off(exynos_ohci->phy[i]);
 108 }
 109
 110 static int exynos_ohci_probe(struct platform_device *pdev)
 111 {
 112         struct exynos_ohci_hcd *exynos_ohci;
 113         struct usb_hcd *hcd;
 114         struct resource *res;
 115         int irq;
 116         int err;
 117
 118         /*
 119          * Right now device-tree probed devices don't get dma_mask set.
 120          * Since shared usb code relies on it, set it here for now.
 121          * Once we move to full device tree support this will vanish off.
 122          */
 123         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 124         if (err)
 125                 return err;
 126
 127         hcd = usb_create_hcd(&exynos_ohci_hc_driver,
 128                                 &pdev->dev, dev_name(&pdev->dev));
 129         if (!hcd) {
 130                 dev_err(&pdev->dev, "Unable to create HCD\n");
 131                 return -ENOMEM;
 132         }
 133
 134         exynos_ohci = to_exynos_ohci(hcd);
 135
 136         if (of_device_is_compatible(pdev->dev.of_node,
 137                                         "samsung,exynos5440-ohci"))
 138                 goto skip_phy;
 139
 140         err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
 141         if (err)
 142                 goto fail_clk;
 143
 144 skip_phy:
 145         exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
 146
 147         if (IS_ERR(exynos_ohci->clk)) {
 148                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 149                 err = PTR_ERR(exynos_ohci->clk);
 150                 goto fail_clk;
 151         }
 152
 153         err = clk_prepare_enable(exynos_ohci->clk);
 154         if (err)
 155                 goto fail_clk;
 156
 157         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 158         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 159         if (IS_ERR(hcd->regs)) {
 160                 err = PTR_ERR(hcd->regs);
 161                 goto fail_io;
 162         }
 163         hcd->rsrc_start = res->start;
 164         hcd->rsrc_len = resource_size(res);
 165
 166         irq = platform_get_irq(pdev, 0);
 167         if (!irq) {
 168                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 169                 err = -ENODEV;
 170                 goto fail_io;
 171         }
 172
 173         platform_set_drvdata(pdev, hcd);
 174
 175         err = exynos_ohci_phy_enable(&pdev->dev);
 176         if (err) {
 177                 dev_err(&pdev->dev, "Failed to enable USB phy\n");
 178                 goto fail_io;
 179         }
 180
 181         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 182         if (err) {
 183                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 184                 goto fail_add_hcd;
 185         }
 186         device_wakeup_enable(hcd->self.controller);
 187         return 0;
 188
 189 fail_add_hcd:
 190         exynos_ohci_phy_disable(&pdev->dev);
 191 fail_io:
 192         clk_disable_unprepare(exynos_ohci->clk);
 193 fail_clk:
 194         usb_put_hcd(hcd);
 195         return err;
 196 }
 197
 198 static int exynos_ohci_remove(struct platform_device *pdev)
 199 {
 200         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 201         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 202
 203         usb_remove_hcd(hcd);
 204
 205         exynos_ohci_phy_disable(&pdev->dev);
 206
 207         clk_disable_unprepare(exynos_ohci->clk);
 208
 209         usb_put_hcd(hcd);
 210
 211         return 0;
 212 }
 213
 214 static void exynos_ohci_shutdown(struct platform_device *pdev)
 215 {
 216         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 217
 218         if (hcd->driver->shutdown)
 219                 hcd->driver->shutdown(hcd);
 220 }
 221
 222 #ifdef CONFIG_PM
 223 static int exynos_ohci_suspend(struct device *dev)
 224 {
 225         struct usb_hcd *hcd = dev_get_drvdata(dev);
 226         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 227         bool do_wakeup = device_may_wakeup(dev);
 228         int rc = ohci_suspend(hcd, do_wakeup);
 229
 230         if (rc)
 231                 return rc;
 232
 233         exynos_ohci_phy_disable(dev);
 234
 235         clk_disable_unprepare(exynos_ohci->clk);
 236
 237         return 0;
 238 }
 239
 240 static int exynos_ohci_resume(struct device *dev)
 241 {
 242         struct usb_hcd *hcd                     = dev_get_drvdata(dev);
 243         struct exynos_ohci_hcd *exynos_ohci     = to_exynos_ohci(hcd);
 244         int ret;
 245
 246         clk_prepare_enable(exynos_ohci->clk);
 247
 248         ret = exynos_ohci_phy_enable(dev);
 249         if (ret) {
 250                 dev_err(dev, "Failed to enable USB phy\n");
 251                 clk_disable_unprepare(exynos_ohci->clk);
 252                 return ret;
 253         }
 254
 255         ohci_resume(hcd, false);
 256
 257         return 0;
 258 }
 259 #else
 260 #define exynos_ohci_suspend     NULL
 261 #define exynos_ohci_resume      NULL
 262 #endif
 263
 264 static const struct ohci_driver_overrides exynos_overrides __initconst = {
 265         .extra_priv_size =      sizeof(struct exynos_ohci_hcd),
 266 };
 267
 268 static const struct dev_pm_ops exynos_ohci_pm_ops = {
 269         .suspend        = exynos_ohci_suspend,
 270         .resume         = exynos_ohci_resume,
 271 };
 272
 273 #ifdef CONFIG_OF
 274 static const struct of_device_id exynos_ohci_match[] = {
 275         { .compatible = "samsung,exynos4210-ohci" },
 276         { .compatible = "samsung,exynos5440-ohci" },
 277         {},
 278 };
 279 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
 280 #endif
 281
 282 static struct platform_driver exynos_ohci_driver = {
 283         .probe          = exynos_ohci_probe,
 284         .remove         = exynos_ohci_remove,
 285         .shutdown       = exynos_ohci_shutdown,
 286         .driver = {
 287                 .name   = "exynos-ohci",
 288                 .pm     = &exynos_ohci_pm_ops,
 289                 .of_match_table = of_match_ptr(exynos_ohci_match),
 290         }
 291 };
 292 static int __init ohci_exynos_init(void)
 293 {
 294         if (usb_disabled())
 295                 return -ENODEV;
 296
 297         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 298         ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
 299         return platform_driver_register(&exynos_ohci_driver);
 300 }
 301 module_init(ohci_exynos_init);
 302
 303 static void __exit ohci_exynos_cleanup(void)
 304 {
 305         platform_driver_unregister(&exynos_ohci_driver);
 306 }
 307 module_exit(ohci_exynos_cleanup);
 308
 309 MODULE_ALIAS("platform:exynos-ohci");
 310 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 311 MODULE_LICENSE("GPL v2");