target/linux/sunxi/patches-3.14/195-1-ohci-plat-changes.patch

   1 From 49ff47db168655cac5213cf5dd1844b08fb9823c Mon Sep 17 00:00:00 2001
   2 From: Hans de Goede <hdegoede@redhat.com>
   3 Date: Sun, 5 Jan 2014 14:42:39 +0100
   4 Subject: [PATCH] ohci-platform: Add support for devicetree instantiation
   5
   6 Add support for ohci-platform instantiation from devicetree, including
   7 optionally getting clks and a phy from devicetree, and enabling / disabling
   8 those on power_on / off.
   9
  10 This should allow using ohci-platform from devicetree in various cases.
  11 Specifically after this commit it can be used for the ohci controller found
  12 on Allwinner sunxi SoCs.
  13
  14 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  15 Acked-by: Alan Stern <stern@rowland.harvard.edu>
  16 ---
  17  Documentation/devicetree/bindings/usb/usb-ohci.txt |  22 +++
  18  drivers/usb/host/ohci-platform.c                   | 162 ++++++++++++++++++---
  19  2 files changed, 162 insertions(+), 22 deletions(-)
  20  create mode 100644 Documentation/devicetree/bindings/usb/usb-ohci.txt
  21
  22 --- /dev/null
  23 +++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt
  24 @@ -0,0 +1,25 @@
  25 +USB OHCI controllers
  26 +
  27 +Required properties:
  28 +- compatible : "generic-ohci"
  29 +- reg : ohci controller register range (address and length)
  30 +- interrupts : ohci controller interrupt
  31 +
  32 +Optional properties:
  33 +- big-endian-regs : boolean, set this for hcds with big-endian registers
  34 +- big-endian-desc : boolean, set this for hcds with big-endian descriptors
  35 +- big-endian : boolean, for hcds with big-endian-regs + big-endian-desc
  36 +- clocks : a list of phandle + clock specifier pairs
  37 +- phys : phandle + phy specifier pair
  38 +- phy-names : "usb"
  39 +
  40 +Example:
  41 +
  42 +       ohci0: usb@01c14400 {
  43 +               compatible = "allwinner,sun4i-a10-ohci", "generic-ohci";
  44 +               reg = <0x01c14400 0x100>;
  45 +               interrupts = <64>;
  46 +               clocks = <&usb_clk 6>, <&ahb_gates 2>;
  47 +               phys = <&usbphy 1>;
  48 +               phy-names = "usb";
  49 +       };
  50 --- a/drivers/usb/host/ohci-platform.c
  51 +++ b/drivers/usb/host/ohci-platform.c
  52 @@ -3,6 +3,7 @@
  53   *
  54   * Copyright 2007 Michael Buesch <m@bues.ch>
  55   * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
  56 + * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
  57   *
  58   * Derived from the OCHI-SSB driver
  59   * Derived from the OHCI-PCI driver
  60 @@ -14,11 +15,14 @@
  61   * Licensed under the GNU/GPL. See COPYING for details.
  62   */
  63
  64 +#include <linux/clk.h>
  65 +#include <linux/dma-mapping.h>
  66  #include <linux/hrtimer.h>
  67  #include <linux/io.h>
  68  #include <linux/kernel.h>
  69  #include <linux/module.h>
  70  #include <linux/err.h>
  71 +#include <linux/phy/phy.h>
  72  #include <linux/platform_device.h>
  73  #include <linux/usb/ohci_pdriver.h>
  74  #include <linux/usb.h>
  75 @@ -27,6 +31,13 @@
  76  #include "ohci.h"
  77
  78  #define DRIVER_DESC "OHCI generic platform driver"
  79 +#define OHCI_MAX_CLKS 3
  80 +#define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
  81 +
  82 +struct ohci_platform_priv {
  83 +       struct clk *clks[OHCI_MAX_CLKS];
  84 +       struct phy *phy;
  85 +};
  86
  87  static const char hcd_name[] = "ohci-platform";
  88
  89 @@ -48,11 +59,67 @@ static int ohci_platform_reset(struct us
  90         return ohci_setup(hcd);
  91  }
  92
  93 +static int ohci_platform_power_on(struct platform_device *dev)
  94 +{
  95 +       struct usb_hcd *hcd = platform_get_drvdata(dev);
  96 +       struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
  97 +       int clk, ret;
  98 +
  99 +       for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
 100 +               ret = clk_prepare_enable(priv->clks[clk]);
 101 +               if (ret)
 102 +                       goto err_disable_clks;
 103 +       }
 104 +
 105 +       if (priv->phy) {
 106 +               ret = phy_init(priv->phy);
 107 +               if (ret)
 108 +                       goto err_disable_clks;
 109 +
 110 +               ret = phy_power_on(priv->phy);
 111 +               if (ret)
 112 +                       goto err_exit_phy;
 113 +       }
 114 +
 115 +       return 0;
 116 +
 117 +err_exit_phy:
 118 +       phy_exit(priv->phy);
 119 +err_disable_clks:
 120 +       while (--clk >= 0)
 121 +               clk_disable_unprepare(priv->clks[clk]);
 122 +
 123 +       return ret;
 124 +}
 125 +
 126 +static void ohci_platform_power_off(struct platform_device *dev)
 127 +{
 128 +       struct usb_hcd *hcd = platform_get_drvdata(dev);
 129 +       struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 130 +       int clk;
 131 +
 132 +       if (priv->phy) {
 133 +               phy_power_off(priv->phy);
 134 +               phy_exit(priv->phy);
 135 +       }
 136 +
 137 +       for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
 138 +               if (priv->clks[clk])
 139 +                       clk_disable_unprepare(priv->clks[clk]);
 140 +}
 141 +
 142  static struct hc_driver __read_mostly ohci_platform_hc_driver;
 143
 144  static const struct ohci_driver_overrides platform_overrides __initconst = {
 145 -       .product_desc = "Generic Platform OHCI controller",
 146 -       .reset =        ohci_platform_reset,
 147 +       .product_desc =         "Generic Platform OHCI controller",
 148 +       .reset =                ohci_platform_reset,
 149 +       .extra_priv_size =      sizeof(struct ohci_platform_priv),
 150 +};
 151 +
 152 +static struct usb_ohci_pdata ohci_platform_defaults = {
 153 +       .power_on =             ohci_platform_power_on,
 154 +       .power_suspend =        ohci_platform_power_off,
 155 +       .power_off =            ohci_platform_power_off,
 156  };
 157
 158  static int ohci_platform_probe(struct platform_device *dev)
 159 @@ -60,17 +127,24 @@ static int ohci_platform_probe(struct pl
 160         struct usb_hcd *hcd;
 161         struct resource *res_mem;
 162         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 163 -       int irq;
 164 -       int err = -ENOMEM;
 165 -
 166 -       if (!pdata) {
 167 -               WARN_ON(1);
 168 -               return -ENODEV;
 169 -       }
 170 +       struct ohci_platform_priv *priv;
 171 +       struct ohci_hcd *ohci;
 172 +       int err, irq, clk = 0;
 173
 174         if (usb_disabled())
 175                 return -ENODEV;
 176
 177 +       /*
 178 +        * Use reasonable defaults so platforms don't have to provide these
 179 +        * with DT probing on ARM.
 180 +        */
 181 +       if (!pdata)
 182 +               pdata = &ohci_platform_defaults;
 183 +
 184 +       err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
 185 +       if (err)
 186 +               return err;
 187 +
 188         irq = platform_get_irq(dev, 0);
 189         if (irq < 0) {
 190                 dev_err(&dev->dev, "no irq provided");
 191 @@ -83,17 +157,66 @@ static int ohci_platform_probe(struct pl
 192                 return -ENXIO;
 193         }
 194
 195 +       hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
 196 +                       dev_name(&dev->dev));
 197 +       if (!hcd)
 198 +               return -ENOMEM;
 199 +
 200 +       platform_set_drvdata(dev, hcd);
 201 +       dev->dev.platform_data = pdata;
 202 +       priv = hcd_to_ohci_priv(hcd);
 203 +       ohci = hcd_to_ohci(hcd);
 204 +
 205 +       if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
 206 +               if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
 207 +                       ohci->flags |= OHCI_QUIRK_BE_MMIO;
 208 +
 209 +               if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
 210 +                       ohci->flags |= OHCI_QUIRK_BE_DESC;
 211 +
 212 +               if (of_property_read_bool(dev->dev.of_node, "big-endian"))
 213 +                       ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
 214 +
 215 +#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
 216 +               if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
 217 +                       dev_err(&dev->dev,
 218 +                               "Error big-endian-regs not compiled in\n");
 219 +                       err = -EINVAL;
 220 +                       goto err_put_hcd;
 221 +               }
 222 +#endif
 223 +#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
 224 +               if (ohci->flags & OHCI_QUIRK_BE_DESC) {
 225 +                       dev_err(&dev->dev,
 226 +                               "Error big-endian-desc not compiled in\n");
 227 +                       err = -EINVAL;
 228 +                       goto err_put_hcd;
 229 +               }
 230 +#endif
 231 +               priv->phy = devm_phy_get(&dev->dev, "usb");
 232 +               if (IS_ERR(priv->phy)) {
 233 +                       err = PTR_ERR(priv->phy);
 234 +                       if (err == -EPROBE_DEFER)
 235 +                               goto err_put_hcd;
 236 +                       priv->phy = NULL;
 237 +               }
 238 +
 239 +               for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
 240 +                       priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
 241 +                       if (IS_ERR(priv->clks[clk])) {
 242 +                               err = PTR_ERR(priv->clks[clk]);
 243 +                               if (err == -EPROBE_DEFER)
 244 +                                       goto err_put_clks;
 245 +                               priv->clks[clk] = NULL;
 246 +                               break;
 247 +                       }
 248 +               }
 249 +       }
 250 +
 251         if (pdata->power_on) {
 252                 err = pdata->power_on(dev);
 253                 if (err < 0)
 254 -                       return err;
 255 -       }
 256 -
 257 -       hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
 258 -                       dev_name(&dev->dev));
 259 -       if (!hcd) {
 260 -               err = -ENOMEM;
 261 -               goto err_power;
 262 +                       goto err_put_clks;
 263         }
 264
 265         hcd->rsrc_start = res_mem->start;
 266 @@ -102,11 +225,11 @@ static int ohci_platform_probe(struct pl
 267         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
 268         if (IS_ERR(hcd->regs)) {
 269                 err = PTR_ERR(hcd->regs);
 270 -               goto err_put_hcd;
 271 +               goto err_power;
 272         }
 273         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 274         if (err)
 275 -               goto err_put_hcd;
 276 +               goto err_power;
 277
 278         device_wakeup_enable(hcd->self.controller);
 279
 280 @@ -114,11 +237,17 @@ static int ohci_platform_probe(struct pl
 281
 282         return err;
 283
 284 -err_put_hcd:
 285 -       usb_put_hcd(hcd);
 286  err_power:
 287         if (pdata->power_off)
 288                 pdata->power_off(dev);
 289 +err_put_clks:
 290 +       while (--clk >= 0)
 291 +               clk_put(priv->clks[clk]);
 292 +err_put_hcd:
 293 +       if (pdata == &ohci_platform_defaults)
 294 +               dev->dev.platform_data = NULL;
 295 +
 296 +       usb_put_hcd(hcd);
 297
 298         return err;
 299  }
 300 @@ -127,13 +256,22 @@ static int ohci_platform_remove(struct p
 301  {
 302         struct usb_hcd *hcd = platform_get_drvdata(dev);
 303         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 304 +       struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 305 +       int clk;
 306
 307         usb_remove_hcd(hcd);
 308 -       usb_put_hcd(hcd);
 309
 310         if (pdata->power_off)
 311                 pdata->power_off(dev);
 312
 313 +       for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
 314 +               clk_put(priv->clks[clk]);
 315 +
 316 +       usb_put_hcd(hcd);
 317 +
 318 +       if (pdata == &ohci_platform_defaults)
 319 +               dev->dev.platform_data = NULL;
 320 +
 321         return 0;
 322  }
 323
 324 @@ -180,6 +318,12 @@ static int ohci_platform_resume(struct d
 325  #define ohci_platform_resume   NULL
 326  #endif /* CONFIG_PM */
 327
 328 +static const struct of_device_id ohci_platform_ids[] = {
 329 +       { .compatible = "generic-ohci", },
 330 +       { }
 331 +};
 332 +MODULE_DEVICE_TABLE(of, ohci_platform_ids);
 333 +
 334  static const struct platform_device_id ohci_platform_table[] = {
 335         { "ohci-platform", 0 },
 336         { }
 337 @@ -200,6 +344,7 @@ static struct platform_driver ohci_platf
 338                 .owner  = THIS_MODULE,
 339                 .name   = "ohci-platform",
 340                 .pm     = &ohci_platform_pm_ops,
 341 +               .of_match_table = ohci_platform_ids,
 342         }
 343  };
 344