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                                 return ret;
  81                         } else if (ret != -ENOSYS && ret != -ENODEV) {
  82                                 dev_err(dev,
  83                                         "Error retrieving usb2 phy: %d\n", ret);
  84                                 return ret;
  85                         }
  86                 }
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int exynos_ehci_phy_enable(struct device *dev)
  93 {
  94         struct usb_hcd *hcd = dev_get_drvdata(dev);
  95         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
  96         int i;
  97         int ret = 0;
  98
  99         for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
 100                 if (!IS_ERR(exynos_ehci->phy[i]))
 101                         ret = phy_power_on(exynos_ehci->phy[i]);
 102         if (ret)
 103                 for (i--; i >= 0; i--)
 104                         if (!IS_ERR(exynos_ehci->phy[i]))
 105                                 phy_power_off(exynos_ehci->phy[i]);
 106
 107         return ret;
 108 }
 109
 110 static void exynos_ehci_phy_disable(struct device *dev)
 111 {
 112         struct usb_hcd *hcd = dev_get_drvdata(dev);
 113         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 114         int i;
 115
 116         for (i = 0; i < PHY_NUMBER; i++)
 117                 if (!IS_ERR(exynos_ehci->phy[i]))
 118                         phy_power_off(exynos_ehci->phy[i]);
 119 }
 120
 121 static void exynos_setup_vbus_gpio(struct device *dev)
 122 {
 123         int err;
 124         int gpio;
 125
 126         if (!dev->of_node)
 127                 return;
 128
 129         gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
 130         if (!gpio_is_valid(gpio))
 131                 return;
 132
 133         err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
 134                                     "ehci_vbus_gpio");
 135         if (err)
 136                 dev_err(dev, "can't request ehci vbus gpio %d", gpio);
 137 }
 138
 139 static int exynos_ehci_probe(struct platform_device *pdev)
 140 {
 141         struct exynos_ehci_hcd *exynos_ehci;
 142         struct usb_hcd *hcd;
 143         struct ehci_hcd *ehci;
 144         struct resource *res;
 145         int irq;
 146         int err;
 147
 148         /*
 149          * Right now device-tree probed devices don't get dma_mask set.
 150          * Since shared usb code relies on it, set it here for now.
 151          * Once we move to full device tree support this will vanish off.
 152          */
 153         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 154         if (err)
 155                 return err;
 156
 157         exynos_setup_vbus_gpio(&pdev->dev);
 158
 159         hcd = usb_create_hcd(&exynos_ehci_hc_driver,
 160                              &pdev->dev, dev_name(&pdev->dev));
 161         if (!hcd) {
 162                 dev_err(&pdev->dev, "Unable to create HCD\n");
 163                 return -ENOMEM;
 164         }
 165         exynos_ehci = to_exynos_ehci(hcd);
 166
 167         if (of_device_is_compatible(pdev->dev.of_node,
 168                                         "samsung,exynos5440-ehci"))
 169                 goto skip_phy;
 170
 171         err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
 172         if (err)
 173                 goto fail_clk;
 174
 175 skip_phy:
 176
 177         exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
 178
 179         if (IS_ERR(exynos_ehci->clk)) {
 180                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 181                 err = PTR_ERR(exynos_ehci->clk);
 182                 goto fail_clk;
 183         }
 184
 185         err = clk_prepare_enable(exynos_ehci->clk);
 186         if (err)
 187                 goto fail_clk;
 188
 189         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 190         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 191         if (IS_ERR(hcd->regs)) {
 192                 err = PTR_ERR(hcd->regs);
 193                 goto fail_io;
 194         }
 195
 196         hcd->rsrc_start = res->start;
 197         hcd->rsrc_len = resource_size(res);
 198
 199         irq = platform_get_irq(pdev, 0);
 200         if (!irq) {
 201                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 202                 err = -ENODEV;
 203                 goto fail_io;
 204         }
 205
 206         err = exynos_ehci_phy_enable(&pdev->dev);
 207         if (err) {
 208                 dev_err(&pdev->dev, "Failed to enable USB phy\n");
 209                 goto fail_io;
 210         }
 211
 212         ehci = hcd_to_ehci(hcd);
 213         ehci->caps = hcd->regs;
 214
 215         /* DMA burst Enable */
 216         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
 217
 218         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 219         if (err) {
 220                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 221                 goto fail_add_hcd;
 222         }
 223         device_wakeup_enable(hcd->self.controller);
 224
 225         platform_set_drvdata(pdev, hcd);
 226
 227         return 0;
 228
 229 fail_add_hcd:
 230         exynos_ehci_phy_disable(&pdev->dev);
 231 fail_io:
 232         clk_disable_unprepare(exynos_ehci->clk);
 233 fail_clk:
 234         usb_put_hcd(hcd);
 235         return err;
 236 }
 237
 238 static int exynos_ehci_remove(struct platform_device *pdev)
 239 {
 240         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 241         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 242
 243         usb_remove_hcd(hcd);
 244
 245         exynos_ehci_phy_disable(&pdev->dev);
 246
 247         clk_disable_unprepare(exynos_ehci->clk);
 248
 249         usb_put_hcd(hcd);
 250
 251         return 0;
 252 }
 253
 254 #ifdef CONFIG_PM
 255 static int exynos_ehci_suspend(struct device *dev)
 256 {
 257         struct usb_hcd *hcd = dev_get_drvdata(dev);
 258         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 259
 260         bool do_wakeup = device_may_wakeup(dev);
 261         int rc;
 262
 263         rc = ehci_suspend(hcd, do_wakeup);
 264         if (rc)
 265                 return rc;
 266
 267         exynos_ehci_phy_disable(dev);
 268
 269         clk_disable_unprepare(exynos_ehci->clk);
 270
 271         return rc;
 272 }
 273
 274 static int exynos_ehci_resume(struct device *dev)
 275 {
 276         struct usb_hcd *hcd = dev_get_drvdata(dev);
 277         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 278         int ret;
 279
 280         clk_prepare_enable(exynos_ehci->clk);
 281
 282         ret = exynos_ehci_phy_enable(dev);
 283         if (ret) {
 284                 dev_err(dev, "Failed to enable USB phy\n");
 285                 clk_disable_unprepare(exynos_ehci->clk);
 286                 return ret;
 287         }
 288
 289         /* DMA burst Enable */
 290         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
 291
 292         ehci_resume(hcd, false);
 293         return 0;
 294 }
 295 #else
 296 #define exynos_ehci_suspend     NULL
 297 #define exynos_ehci_resume      NULL
 298 #endif
 299
 300 static const struct dev_pm_ops exynos_ehci_pm_ops = {
 301         .suspend        = exynos_ehci_suspend,
 302         .resume         = exynos_ehci_resume,
 303 };
 304
 305 #ifdef CONFIG_OF
 306 static const struct of_device_id exynos_ehci_match[] = {
 307         { .compatible = "samsung,exynos4210-ehci" },
 308         { .compatible = "samsung,exynos5440-ehci" },
 309         {},
 310 };
 311 MODULE_DEVICE_TABLE(of, exynos_ehci_match);
 312 #endif
 313
 314 static struct platform_driver exynos_ehci_driver = {
 315         .probe          = exynos_ehci_probe,
 316         .remove         = exynos_ehci_remove,
 317         .shutdown       = usb_hcd_platform_shutdown,
 318         .driver = {
 319                 .name   = "exynos-ehci",
 320                 .pm     = &exynos_ehci_pm_ops,
 321                 .of_match_table = of_match_ptr(exynos_ehci_match),
 322         }
 323 };
 324 static const struct ehci_driver_overrides exynos_overrides __initconst = {
 325         .extra_priv_size = sizeof(struct exynos_ehci_hcd),
 326 };
 327
 328 static int __init ehci_exynos_init(void)
 329 {
 330         if (usb_disabled())
 331                 return -ENODEV;
 332
 333         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 334         ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
 335         return platform_driver_register(&exynos_ehci_driver);
 336 }
 337 module_init(ehci_exynos_init);
 338
 339 static void __exit ehci_exynos_cleanup(void)
 340 {
 341         platform_driver_unregister(&exynos_ehci_driver);
 342 }
 343 module_exit(ehci_exynos_cleanup);
 344
 345 MODULE_DESCRIPTION(DRIVER_DESC);
 346 MODULE_ALIAS("platform:exynos-ehci");
 347 MODULE_AUTHOR("Jingoo Han");
 348 MODULE_AUTHOR("Joonyoung Shim");
 349 MODULE_LICENSE("GPL v2");