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 static struct s5p_ehci_platdata empty_platdata;
  54
  55 #define to_s5p_ehci(hcd)      (struct s5p_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
  56
  57 static void s5p_setup_vbus_gpio(struct platform_device *pdev)
  58 {
  59         struct device *dev = &pdev->dev;
  60         int err;
  61         int gpio;
  62
  63         if (!dev->of_node)
  64                 return;
  65
  66         gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
  67         if (!gpio_is_valid(gpio))
  68                 return;
  69
  70         err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
  71                                     "ehci_vbus_gpio");
  72         if (err)
  73                 dev_err(dev, "can't request ehci vbus gpio %d", gpio);
  74 }
  75
  76 static int s5p_ehci_probe(struct platform_device *pdev)
  77 {
  78         struct s5p_ehci_platdata *pdata = dev_get_platdata(&pdev->dev);
  79         struct s5p_ehci_hcd *s5p_ehci;
  80         struct usb_hcd *hcd;
  81         struct ehci_hcd *ehci;
  82         struct resource *res;
  83         struct usb_phy *phy;
  84         int irq;
  85         int err;
  86
  87         /*
  88          * Right now device-tree probed devices don't get dma_mask set.
  89          * Since shared usb code relies on it, set it here for now.
  90          * Once we move to full device tree support this will vanish off.
  91          */
  92         if (!pdev->dev.dma_mask)
  93                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
  94         if (!pdev->dev.coherent_dma_mask)
  95                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
  96
  97         s5p_setup_vbus_gpio(pdev);
  98
  99         hcd = usb_create_hcd(&s5p_ehci_hc_driver,
 100                              &pdev->dev, dev_name(&pdev->dev));
 101         if (!hcd) {
 102                 dev_err(&pdev->dev, "Unable to create HCD\n");
 103                 return -ENOMEM;
 104         }
 105         s5p_ehci = to_s5p_ehci(hcd);
 106
 107         if (of_device_is_compatible(pdev->dev.of_node,
 108                                         "samsung,exynos5440-ehci")) {
 109                 s5p_ehci->pdata = &empty_platdata;
 110                 goto skip_phy;
 111         }
 112
 113         phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 114         if (IS_ERR(phy)) {
 115                 /* Fallback to pdata */
 116                 if (!pdata) {
 117                         usb_put_hcd(hcd);
 118                         dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
 119                         return -EPROBE_DEFER;
 120                 } else {
 121                         s5p_ehci->pdata = pdata;
 122                 }
 123         } else {
 124                 s5p_ehci->phy = phy;
 125                 s5p_ehci->otg = phy->otg;
 126         }
 127
 128 skip_phy:
 129
 130         s5p_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
 131
 132         if (IS_ERR(s5p_ehci->clk)) {
 133                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 134                 err = PTR_ERR(s5p_ehci->clk);
 135                 goto fail_clk;
 136         }
 137
 138         err = clk_prepare_enable(s5p_ehci->clk);
 139         if (err)
 140                 goto fail_clk;
 141
 142         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 143         if (!res) {
 144                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 145                 err = -ENXIO;
 146                 goto fail_io;
 147         }
 148
 149         hcd->rsrc_start = res->start;
 150         hcd->rsrc_len = resource_size(res);
 151         hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
 152         if (!hcd->regs) {
 153                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 154                 err = -ENOMEM;
 155                 goto fail_io;
 156         }
 157
 158         irq = platform_get_irq(pdev, 0);
 159         if (!irq) {
 160                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 161                 err = -ENODEV;
 162                 goto fail_io;
 163         }
 164
 165         if (s5p_ehci->otg)
 166                 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
 167
 168         if (s5p_ehci->phy)
 169                 usb_phy_init(s5p_ehci->phy);
 170         else if (s5p_ehci->pdata->phy_init)
 171                 s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
 172
 173         ehci = hcd_to_ehci(hcd);
 174         ehci->caps = hcd->regs;
 175
 176         /* DMA burst Enable */
 177         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
 178
 179         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 180         if (err) {
 181                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 182                 goto fail_add_hcd;
 183         }
 184
 185         platform_set_drvdata(pdev, hcd);
 186
 187         return 0;
 188
 189 fail_add_hcd:
 190         if (s5p_ehci->phy)
 191                 usb_phy_shutdown(s5p_ehci->phy);
 192         else if (s5p_ehci->pdata->phy_exit)
 193                 s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
 194 fail_io:
 195         clk_disable_unprepare(s5p_ehci->clk);
 196 fail_clk:
 197         usb_put_hcd(hcd);
 198         return err;
 199 }
 200
 201 static int s5p_ehci_remove(struct platform_device *pdev)
 202 {
 203         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 204         struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
 205
 206         usb_remove_hcd(hcd);
 207
 208         if (s5p_ehci->otg)
 209                 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
 210
 211         if (s5p_ehci->phy)
 212                 usb_phy_shutdown(s5p_ehci->phy);
 213         else if (s5p_ehci->pdata->phy_exit)
 214                 s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
 215
 216         clk_disable_unprepare(s5p_ehci->clk);
 217
 218         usb_put_hcd(hcd);
 219
 220         return 0;
 221 }
 222
 223 #ifdef CONFIG_PM
 224 static int s5p_ehci_suspend(struct device *dev)
 225 {
 226         struct usb_hcd *hcd = dev_get_drvdata(dev);
 227         struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
 228         struct platform_device *pdev = to_platform_device(dev);
 229
 230         bool do_wakeup = device_may_wakeup(dev);
 231         int rc;
 232
 233         rc = ehci_suspend(hcd, do_wakeup);
 234
 235         if (s5p_ehci->otg)
 236                 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
 237
 238         if (s5p_ehci->phy)
 239                 usb_phy_shutdown(s5p_ehci->phy);
 240         else if (s5p_ehci->pdata->phy_exit)
 241                 s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
 242
 243         clk_disable_unprepare(s5p_ehci->clk);
 244
 245         return rc;
 246 }
 247
 248 static int s5p_ehci_resume(struct device *dev)
 249 {
 250         struct usb_hcd *hcd = dev_get_drvdata(dev);
 251         struct  s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
 252         struct platform_device *pdev = to_platform_device(dev);
 253
 254         clk_prepare_enable(s5p_ehci->clk);
 255
 256         if (s5p_ehci->otg)
 257                 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
 258
 259         if (s5p_ehci->phy)
 260                 usb_phy_init(s5p_ehci->phy);
 261         else if (s5p_ehci->pdata->phy_init)
 262                 s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
 263
 264         /* DMA burst Enable */
 265         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
 266
 267         ehci_resume(hcd, false);
 268         return 0;
 269 }
 270 #else
 271 #define s5p_ehci_suspend        NULL
 272 #define s5p_ehci_resume         NULL
 273 #endif
 274
 275 static const struct dev_pm_ops s5p_ehci_pm_ops = {
 276         .suspend        = s5p_ehci_suspend,
 277         .resume         = s5p_ehci_resume,
 278 };
 279
 280 #ifdef CONFIG_OF
 281 static const struct of_device_id exynos_ehci_match[] = {
 282         { .compatible = "samsung,exynos4210-ehci" },
 283         { .compatible = "samsung,exynos5440-ehci" },
 284         {},
 285 };
 286 MODULE_DEVICE_TABLE(of, exynos_ehci_match);
 287 #endif
 288
 289 static struct platform_driver s5p_ehci_driver = {
 290         .probe          = s5p_ehci_probe,
 291         .remove         = s5p_ehci_remove,
 292         .shutdown       = usb_hcd_platform_shutdown,
 293         .driver = {
 294                 .name   = "s5p-ehci",
 295                 .owner  = THIS_MODULE,
 296                 .pm     = &s5p_ehci_pm_ops,
 297                 .of_match_table = of_match_ptr(exynos_ehci_match),
 298         }
 299 };
 300 static const struct ehci_driver_overrides s5p_overrides __initdata = {
 301         .extra_priv_size = sizeof(struct s5p_ehci_hcd),
 302 };
 303
 304 static int __init ehci_s5p_init(void)
 305 {
 306         if (usb_disabled())
 307                 return -ENODEV;
 308
 309         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 310         ehci_init_driver(&s5p_ehci_hc_driver, &s5p_overrides);
 311         return platform_driver_register(&s5p_ehci_driver);
 312 }
 313 module_init(ehci_s5p_init);
 314
 315 static void __exit ehci_s5p_cleanup(void)
 316 {
 317         platform_driver_unregister(&s5p_ehci_driver);
 318 }
 319 module_exit(ehci_s5p_cleanup);
 320
 321 MODULE_DESCRIPTION(DRIVER_DESC);
 322 MODULE_ALIAS("platform:s5p-ehci");
 323 MODULE_AUTHOR("Jingoo Han");
 324 MODULE_AUTHOR("Joonyoung Shim");
 325 MODULE_LICENSE("GPL v2");