drivers/usb/host/ehci-s5p.c

   1 /*
   2  * SAMSUNG S5P 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/platform_device.h>
  23 #include <linux/platform_data/usb-ehci-s5p.h>
  24 #include <linux/usb/phy.h>
  25 #include <linux/usb/samsung_usb_phy.h>
  26 #include <linux/usb.h>
  27 #include <linux/usb/hcd.h>
  28 #include <linux/usb/otg.h>
  29
  30 #include "ehci.h"
  31
  32 #define DRIVER_DESC "EHCI s5p driver"
  33
  34 #define EHCI_INSNREG00(base)                    (base + 0x90)
  35 #define EHCI_INSNREG00_ENA_INCR16               (0x1 << 25)
  36 #define EHCI_INSNREG00_ENA_INCR8                (0x1 << 24)
  37 #define EHCI_INSNREG00_ENA_INCR4                (0x1 << 23)
  38 #define EHCI_INSNREG00_ENA_INCRX_ALIGN          (0x1 << 22)
  39 #define EHCI_INSNREG00_ENABLE_DMA_BURST \
  40         (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
  41          EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
  42
  43 static const char hcd_name[] = "ehci-s5p";
  44 static struct hc_driver __read_mostly s5p_ehci_hc_driver;
  45
  46 struct s5p_ehci_hcd {
  47         struct clk *clk;
  48         struct usb_phy *phy;
  49         struct usb_otg *otg;
  50         struct s5p_ehci_platdata *pdata;
  51 };
  52
  53 #define to_s5p_ehci(hcd)      (struct s5p_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
  54
  55 static void s5p_setup_vbus_gpio(struct platform_device *pdev)
  56 {
  57         struct device *dev = &pdev->dev;
  58         int err;
  59         int gpio;
  60
  61         if (!dev->of_node)
  62                 return;
  63
  64         gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
  65         if (!gpio_is_valid(gpio))
  66                 return;
  67
  68         err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
  69                                     "ehci_vbus_gpio");
  70         if (err)
  71                 dev_err(dev, "can't request ehci vbus gpio %d", gpio);
  72 }
  73
  74 static int s5p_ehci_probe(struct platform_device *pdev)
  75 {
  76         struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
  77         struct s5p_ehci_hcd *s5p_ehci;
  78         struct usb_hcd *hcd;
  79         struct ehci_hcd *ehci;
  80         struct resource *res;
  81         struct usb_phy *phy;
  82         int irq;
  83         int err;
  84
  85         /*
  86          * Right now device-tree probed devices don't get dma_mask set.
  87          * Since shared usb code relies on it, set it here for now.
  88          * Once we move to full device tree support this will vanish off.
  89          */
  90         if (!pdev->dev.dma_mask)
  91                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
  92         if (!pdev->dev.coherent_dma_mask)
  93                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
  94
  95         s5p_setup_vbus_gpio(pdev);
  96
  97         hcd = usb_create_hcd(&s5p_ehci_hc_driver,
  98                              &pdev->dev, dev_name(&pdev->dev));
  99         if (!hcd) {
 100                 dev_err(&pdev->dev, "Unable to create HCD\n");
 101                 return -ENOMEM;
 102         }
 103         s5p_ehci = to_s5p_ehci(hcd);
 104         phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 105         if (IS_ERR(phy)) {
 106                 /* Fallback to pdata */
 107                 if (!pdata) {
 108                         usb_put_hcd(hcd);
 109                         dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
 110                         return -EPROBE_DEFER;
 111                 } else {
 112                         s5p_ehci->pdata = pdata;
 113                 }
 114         } else {
 115                 s5p_ehci->phy = phy;
 116                 s5p_ehci->otg = phy->otg;
 117         }
 118
 119         s5p_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
 120
 121         if (IS_ERR(s5p_ehci->clk)) {
 122                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 123                 err = PTR_ERR(s5p_ehci->clk);
 124                 goto fail_clk;
 125         }
 126
 127         err = clk_prepare_enable(s5p_ehci->clk);
 128         if (err)
 129                 goto fail_clk;
 130
 131         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 132         if (!res) {
 133                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 134                 err = -ENXIO;
 135                 goto fail_io;
 136         }
 137
 138         hcd->rsrc_start = res->start;
 139         hcd->rsrc_len = resource_size(res);
 140         hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
 141         if (!hcd->regs) {
 142                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 143                 err = -ENOMEM;
 144                 goto fail_io;
 145         }
 146
 147         irq = platform_get_irq(pdev, 0);
 148         if (!irq) {
 149                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 150                 err = -ENODEV;
 151                 goto fail_io;
 152         }
 153
 154         if (s5p_ehci->otg)
 155                 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
 156
 157         if (s5p_ehci->phy)
 158                 usb_phy_init(s5p_ehci->phy);
 159         else if (s5p_ehci->pdata->phy_init)
 160                 s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
 161
 162         ehci = hcd_to_ehci(hcd);
 163         ehci->caps = hcd->regs;
 164
 165         /* DMA burst Enable */
 166         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
 167
 168         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 169         if (err) {
 170                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 171                 goto fail_add_hcd;
 172         }
 173
 174         platform_set_drvdata(pdev, hcd);
 175
 176         return 0;
 177
 178 fail_add_hcd:
 179         if (s5p_ehci->phy)
 180                 usb_phy_shutdown(s5p_ehci->phy);
 181         else if (s5p_ehci->pdata->phy_exit)
 182                 s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
 183 fail_io:
 184         clk_disable_unprepare(s5p_ehci->clk);
 185 fail_clk:
 186         usb_put_hcd(hcd);
 187         return err;
 188 }
 189
 190 static int s5p_ehci_remove(struct platform_device *pdev)
 191 {
 192         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 193         struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
 194
 195         usb_remove_hcd(hcd);
 196
 197         if (s5p_ehci->otg)
 198                 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
 199
 200         if (s5p_ehci->phy)
 201                 usb_phy_shutdown(s5p_ehci->phy);
 202         else if (s5p_ehci->pdata->phy_exit)
 203                 s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
 204
 205         clk_disable_unprepare(s5p_ehci->clk);
 206
 207         usb_put_hcd(hcd);
 208
 209         return 0;
 210 }
 211
 212 static void s5p_ehci_shutdown(struct platform_device *pdev)
 213 {
 214         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 215
 216         if (hcd->driver->shutdown)
 217                 hcd->driver->shutdown(hcd);
 218 }
 219
 220 #ifdef CONFIG_PM
 221 static int s5p_ehci_suspend(struct device *dev)
 222 {
 223         struct usb_hcd *hcd = dev_get_drvdata(dev);
 224         struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
 225         struct platform_device *pdev = to_platform_device(dev);
 226
 227         bool do_wakeup = device_may_wakeup(dev);
 228         int rc;
 229
 230         rc = ehci_suspend(hcd, do_wakeup);
 231
 232         if (s5p_ehci->otg)
 233                 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
 234
 235         if (s5p_ehci->phy)
 236                 usb_phy_shutdown(s5p_ehci->phy);
 237         else if (s5p_ehci->pdata->phy_exit)
 238                 s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
 239
 240         clk_disable_unprepare(s5p_ehci->clk);
 241
 242         return rc;
 243 }
 244
 245 static int s5p_ehci_resume(struct device *dev)
 246 {
 247         struct usb_hcd *hcd = dev_get_drvdata(dev);
 248         struct  s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
 249         struct platform_device *pdev = to_platform_device(dev);
 250
 251         clk_prepare_enable(s5p_ehci->clk);
 252
 253         if (s5p_ehci->otg)
 254                 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
 255
 256         if (s5p_ehci->phy)
 257                 usb_phy_init(s5p_ehci->phy);
 258         else if (s5p_ehci->pdata->phy_init)
 259                 s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
 260
 261         /* DMA burst Enable */
 262         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
 263
 264         ehci_resume(hcd, false);
 265         return 0;
 266 }
 267 #else
 268 #define s5p_ehci_suspend        NULL
 269 #define s5p_ehci_resume         NULL
 270 #endif
 271
 272 static const struct dev_pm_ops s5p_ehci_pm_ops = {
 273         .suspend        = s5p_ehci_suspend,
 274         .resume         = s5p_ehci_resume,
 275 };
 276
 277 #ifdef CONFIG_OF
 278 static const struct of_device_id exynos_ehci_match[] = {
 279         { .compatible = "samsung,exynos4210-ehci" },
 280         {},
 281 };
 282 MODULE_DEVICE_TABLE(of, exynos_ehci_match);
 283 #endif
 284
 285 static struct platform_driver s5p_ehci_driver = {
 286         .probe          = s5p_ehci_probe,
 287         .remove         = s5p_ehci_remove,
 288         .shutdown       = s5p_ehci_shutdown,
 289         .driver = {
 290                 .name   = "s5p-ehci",
 291                 .owner  = THIS_MODULE,
 292                 .pm     = &s5p_ehci_pm_ops,
 293                 .of_match_table = of_match_ptr(exynos_ehci_match),
 294         }
 295 };
 296 static const struct ehci_driver_overrides s5p_overrides __initdata = {
 297         .extra_priv_size = sizeof(struct s5p_ehci_hcd),
 298 };
 299
 300 static int __init ehci_s5p_init(void)
 301 {
 302         if (usb_disabled())
 303                 return -ENODEV;
 304
 305         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 306         ehci_init_driver(&s5p_ehci_hc_driver, &s5p_overrides);
 307         return platform_driver_register(&s5p_ehci_driver);
 308 }
 309 module_init(ehci_s5p_init);
 310
 311 static void __exit ehci_s5p_cleanup(void)
 312 {
 313         platform_driver_unregister(&s5p_ehci_driver);
 314 }
 315 module_exit(ehci_s5p_cleanup);
 316
 317 MODULE_DESCRIPTION(DRIVER_DESC);
 318 MODULE_ALIAS("platform:s5p-ehci");
 319 MODULE_AUTHOR("Jingoo Han");
 320 MODULE_AUTHOR("Joonyoung Shim");
 321 MODULE_LICENSE("GPL v2");