drivers/usb/host/ehci-exynos.c

   1 /*
   2  * SAMSUNG EXYNOS USB HOST EHCI Controller
   3  *
   4  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   5  * Author: Jingoo Han <jg1.han@samsung.com>
   6  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  *
  13  */
  14
  15 #include <linux/clk.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/io.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/of.h>
  21 #include <linux/of_gpio.h>
  22 #include <linux/phy/phy.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/hcd.h>
  26
  27 #include "ehci.h"
  28
  29 #define DRIVER_DESC "EHCI EXYNOS driver"
  30
  31 #define EHCI_INSNREG00(base)                    (base + 0x90)
  32 #define EHCI_INSNREG00_ENA_INCR16               (0x1 << 25)
  33 #define EHCI_INSNREG00_ENA_INCR8                (0x1 << 24)
  34 #define EHCI_INSNREG00_ENA_INCR4                (0x1 << 23)
  35 #define EHCI_INSNREG00_ENA_INCRX_ALIGN          (0x1 << 22)
  36 #define EHCI_INSNREG00_ENABLE_DMA_BURST \
  37         (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
  38          EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
  39
  40 static const char hcd_name[] = "ehci-exynos";
  41 static struct hc_driver __read_mostly exynos_ehci_hc_driver;
  42
  43 #define PHY_NUMBER 3
  44
  45 struct exynos_ehci_hcd {
  46         struct clk *clk;
  47         struct phy *phy[PHY_NUMBER];
  48 };
  49
  50 #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
  51
  52 static int exynos_ehci_get_phy(struct device *dev,
  53                                 struct exynos_ehci_hcd *exynos_ehci)
  54 {
  55         struct device_node *child;
  56         struct phy *phy;
  57         int phy_number;
  58         int ret;
  59
  60         /* Get PHYs for the controller */
  61         for_each_available_child_of_node(dev->of_node, child) {
  62                 ret = of_property_read_u32(child, "reg", &phy_number);
  63                 if (ret) {
  64                         dev_err(dev, "Failed to parse device tree\n");
  65                         of_node_put(child);
  66                         return ret;
  67                 }
  68
  69                 if (phy_number >= PHY_NUMBER) {
  70                         dev_err(dev, "Invalid number of PHYs\n");
  71                         of_node_put(child);
  72                         return -EINVAL;
  73                 }
  74
  75                 phy = devm_of_phy_get(dev, child, NULL);
  76                 exynos_ehci->phy[phy_number] = phy;
  77                 if (IS_ERR(phy)) {
  78                         ret = PTR_ERR(phy);
  79                         if (ret == -EPROBE_DEFER) {
  80                                 of_node_put(child);
  81                                 return ret;
  82                         } else if (ret != -ENOSYS && ret != -ENODEV) {
  83                                 dev_err(dev,
  84                                         "Error retrieving usb2 phy: %d\n", ret);
  85                                 of_node_put(child);
  86                                 return ret;
  87                         }
  88                 }
  89         }
  90
  91         return 0;
  92 }
  93
  94 static int exynos_ehci_phy_enable(struct device *dev)
  95 {
  96         struct usb_hcd *hcd = dev_get_drvdata(dev);
  97         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
  98         int i;
  99         int ret = 0;
 100
 101         for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
 102                 if (!IS_ERR(exynos_ehci->phy[i]))
 103                         ret = phy_power_on(exynos_ehci->phy[i]);
 104         if (ret)
 105                 for (i--; i >= 0; i--)
 106                         if (!IS_ERR(exynos_ehci->phy[i]))
 107                                 phy_power_off(exynos_ehci->phy[i]);
 108
 109         return ret;
 110 }
 111
 112 static void exynos_ehci_phy_disable(struct device *dev)
 113 {
 114         struct usb_hcd *hcd = dev_get_drvdata(dev);
 115         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 116         int i;
 117
 118         for (i = 0; i < PHY_NUMBER; i++)
 119                 if (!IS_ERR(exynos_ehci->phy[i]))
 120                         phy_power_off(exynos_ehci->phy[i]);
 121 }
 122
 123 static void exynos_setup_vbus_gpio(struct device *dev)
 124 {
 125         int err;
 126         int gpio;
 127
 128         if (!dev->of_node)
 129                 return;
 130
 131         gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
 132         if (!gpio_is_valid(gpio))
 133                 return;
 134
 135         err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
 136                                     "ehci_vbus_gpio");
 137         if (err)
 138                 dev_err(dev, "can't request ehci vbus gpio %d", gpio);
 139 }
 140
 141 static int exynos_ehci_probe(struct platform_device *pdev)
 142 {
 143         struct exynos_ehci_hcd *exynos_ehci;
 144         struct usb_hcd *hcd;
 145         struct ehci_hcd *ehci;
 146         struct resource *res;
 147         int irq;
 148         int err;
 149
 150         /*
 151          * Right now device-tree probed devices don't get dma_mask set.
 152          * Since shared usb code relies on it, set it here for now.
 153          * Once we move to full device tree support this will vanish off.
 154          */
 155         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 156         if (err)
 157                 return err;
 158
 159         exynos_setup_vbus_gpio(&pdev->dev);
 160
 161         hcd = usb_create_hcd(&exynos_ehci_hc_driver,
 162                              &pdev->dev, dev_name(&pdev->dev));
 163         if (!hcd) {
 164                 dev_err(&pdev->dev, "Unable to create HCD\n");
 165                 return -ENOMEM;
 166         }
 167         exynos_ehci = to_exynos_ehci(hcd);
 168
 169         if (of_device_is_compatible(pdev->dev.of_node,
 170                                         "samsung,exynos5440-ehci"))
 171                 goto skip_phy;
 172
 173         err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
 174         if (err)
 175                 goto fail_clk;
 176
 177 skip_phy:
 178
 179         exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
 180
 181         if (IS_ERR(exynos_ehci->clk)) {
 182                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 183                 err = PTR_ERR(exynos_ehci->clk);
 184                 goto fail_clk;
 185         }
 186
 187         err = clk_prepare_enable(exynos_ehci->clk);
 188         if (err)
 189                 goto fail_clk;
 190
 191         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 192         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 193         if (IS_ERR(hcd->regs)) {
 194                 err = PTR_ERR(hcd->regs);
 195                 goto fail_io;
 196         }
 197
 198         hcd->rsrc_start = res->start;
 199         hcd->rsrc_len = resource_size(res);
 200
 201         irq = platform_get_irq(pdev, 0);
 202         if (!irq) {
 203                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 204                 err = -ENODEV;
 205                 goto fail_io;
 206         }
 207
 208         err = exynos_ehci_phy_enable(&pdev->dev);
 209         if (err) {
 210                 dev_err(&pdev->dev, "Failed to enable USB phy\n");
 211                 goto fail_io;
 212         }
 213
 214         ehci = hcd_to_ehci(hcd);
 215         ehci->caps = hcd->regs;
 216
 217         /* DMA burst Enable */
 218         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
 219
 220         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 221         if (err) {
 222                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 223                 goto fail_add_hcd;
 224         }
 225         device_wakeup_enable(hcd->self.controller);
 226
 227         platform_set_drvdata(pdev, hcd);
 228
 229         return 0;
 230
 231 fail_add_hcd:
 232         exynos_ehci_phy_disable(&pdev->dev);
 233 fail_io:
 234         clk_disable_unprepare(exynos_ehci->clk);
 235 fail_clk:
 236         usb_put_hcd(hcd);
 237         return err;
 238 }
 239
 240 static int exynos_ehci_remove(struct platform_device *pdev)
 241 {
 242         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 243         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 244
 245         usb_remove_hcd(hcd);
 246
 247         exynos_ehci_phy_disable(&pdev->dev);
 248
 249         clk_disable_unprepare(exynos_ehci->clk);
 250
 251         usb_put_hcd(hcd);
 252
 253         return 0;
 254 }
 255
 256 #ifdef CONFIG_PM
 257 static int exynos_ehci_suspend(struct device *dev)
 258 {
 259         struct usb_hcd *hcd = dev_get_drvdata(dev);
 260         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 261
 262         bool do_wakeup = device_may_wakeup(dev);
 263         int rc;
 264
 265         rc = ehci_suspend(hcd, do_wakeup);
 266         if (rc)
 267                 return rc;
 268
 269         exynos_ehci_phy_disable(dev);
 270
 271         clk_disable_unprepare(exynos_ehci->clk);
 272
 273         return rc;
 274 }
 275
 276 static int exynos_ehci_resume(struct device *dev)
 277 {
 278         struct usb_hcd *hcd = dev_get_drvdata(dev);
 279         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 280         int ret;
 281
 282         ret = clk_prepare_enable(exynos_ehci->clk);
 283         if (ret)
 284                 return ret;
 285
 286         ret = exynos_ehci_phy_enable(dev);
 287         if (ret) {
 288                 dev_err(dev, "Failed to enable USB phy\n");
 289                 clk_disable_unprepare(exynos_ehci->clk);
 290                 return ret;
 291         }
 292
 293         /* DMA burst Enable */
 294         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
 295
 296         ehci_resume(hcd, false);
 297         return 0;
 298 }
 299 #else
 300 #define exynos_ehci_suspend     NULL
 301 #define exynos_ehci_resume      NULL
 302 #endif
 303
 304 static const struct dev_pm_ops exynos_ehci_pm_ops = {
 305         .suspend        = exynos_ehci_suspend,
 306         .resume         = exynos_ehci_resume,
 307 };
 308
 309 #ifdef CONFIG_OF
 310 static const struct of_device_id exynos_ehci_match[] = {
 311         { .compatible = "samsung,exynos4210-ehci" },
 312         { .compatible = "samsung,exynos5440-ehci" },
 313         {},
 314 };
 315 MODULE_DEVICE_TABLE(of, exynos_ehci_match);
 316 #endif
 317
 318 static struct platform_driver exynos_ehci_driver = {
 319         .probe          = exynos_ehci_probe,
 320         .remove         = exynos_ehci_remove,
 321         .shutdown       = usb_hcd_platform_shutdown,
 322         .driver = {
 323                 .name   = "exynos-ehci",
 324                 .pm     = &exynos_ehci_pm_ops,
 325                 .of_match_table = of_match_ptr(exynos_ehci_match),
 326         }
 327 };
 328 static const struct ehci_driver_overrides exynos_overrides __initconst = {
 329         .extra_priv_size = sizeof(struct exynos_ehci_hcd),
 330 };
 331
 332 static int __init ehci_exynos_init(void)
 333 {
 334         if (usb_disabled())
 335                 return -ENODEV;
 336
 337         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 338         ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
 339         return platform_driver_register(&exynos_ehci_driver);
 340 }
 341 module_init(ehci_exynos_init);
 342
 343 static void __exit ehci_exynos_cleanup(void)
 344 {
 345         platform_driver_unregister(&exynos_ehci_driver);
 346 }
 347 module_exit(ehci_exynos_cleanup);
 348
 349 MODULE_DESCRIPTION(DRIVER_DESC);
 350 MODULE_ALIAS("platform:exynos-ehci");
 351 MODULE_AUTHOR("Jingoo Han");
 352 MODULE_AUTHOR("Joonyoung Shim");
 353 MODULE_LICENSE("GPL v2");