target/linux/sunxi/patches-3.13/180-2-usb-ehci-platform-support-clk-phy-via-dt.patch

   1 From 543824fa2a8a592a6eec0e0053063284980dc378 Mon Sep 17 00:00:00 2001
   2 From: Hans de Goede <hdegoede@redhat.com>
   3 Date: Sun, 5 Jan 2014 00:04:02 +0100
   4 Subject: [PATCH] ehci-platform: Add support for clks and phy passed through
   5  devicetree
   6
   7 Currently ehci-platform is only used in combination with devicetree when used
   8 with some Via socs. By extending it to (optionally) get clks and a phy from
   9 devicetree, and enabling / disabling those on power_on / off, it can be used
  10 more generically. Specifically after this commit it can be used for the
  11 ehci controller on Allwinner sunxi SoCs.
  12
  13 Since ehci-platform is intended to handle any generic enough non pci ehci
  14 device, add a "usb-ehci" compatibility string.
  15
  16 There already is a usb-ehci device-tree bindings document, update this
  17 with clks and phy bindings info.
  18
  19 Although actually quite generic so far the via,vt8500 compatibilty string
  20 had its own bindings document. Somehow we even ended up with 2 of them. Since
  21 these provide no extra information over the generic usb-ehci documentation,
  22 this patch removes them.
  23
  24 The ehci-ppc-of.c driver also claims the usb-ehci compatibility string,
  25 even though it mostly is ibm,usb-ehci-440epx specific. ehci-platform.c is
  26 not needed on ppc platforms, so add a !PPC_OF dependency to it to avoid
  27 2 drivers claiming the same compatibility string getting build on ppc.
  28
  29 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  30 Acked-by: Alan Stern <stern@rowland.harvard.edu>
  31 ---
  32  Documentation/devicetree/bindings/usb/usb-ehci.txt |  25 +++-
  33  .../devicetree/bindings/usb/via,vt8500-ehci.txt    |  15 ---
  34  .../devicetree/bindings/usb/vt8500-ehci.txt        |  12 --
  35  drivers/usb/host/Kconfig                           |   1 +
  36  drivers/usb/host/ehci-platform.c                   | 147 +++++++++++++++++----
  37  5 files changed, 142 insertions(+), 58 deletions(-)
  38  delete mode 100644 Documentation/devicetree/bindings/usb/via,vt8500-ehci.txt
  39  delete mode 100644 Documentation/devicetree/bindings/usb/vt8500-ehci.txt
  40
  41 diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
  42 index fa18612..2c1aeeb 100644
  43 --- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
  44 +++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
  45 @@ -7,13 +7,14 @@ Required properties:
  46      (debug-port or other) can be also specified here, but only after
  47      definition of standard EHCI registers.
  48    - interrupts : one EHCI interrupt should be described here.
  49 -If device registers are implemented in big endian mode, the device
  50 -node should have "big-endian-regs" property.
  51 -If controller implementation operates with big endian descriptors,
  52 -"big-endian-desc" property should be specified.
  53 -If both big endian registers and descriptors are used by the controller
  54 -implementation, "big-endian" property can be specified instead of having
  55 -both "big-endian-regs" and "big-endian-desc".
  56 +
  57 +Optional properties:
  58 + - big-endian-regs : boolean, set this for hcds with big-endian registers
  59 + - big-endian-desc : boolean, set this for hcds with big-endian descriptors
  60 + - big-endian : boolean, for hcds with big-endian-regs + big-endian-desc
  61 + - clocks : a list of phandle + clock specifier pairs
  62 + - phys : phandle + phy specifier pair
  63 + - phy-names : "usb"
  64
  65  Example (Sequoia 440EPx):
  66      ehci@e0000300 {
  67 @@ -23,3 +24,13 @@ Example (Sequoia 440EPx):
  68            reg = <0 e0000300 90 0 e0000390 70>;
  69            big-endian;
  70     };
  71 +
  72 +Example (Allwinner sun4i A10 SoC):
  73 +   ehci0: usb@01c14000 {
  74 +          compatible = "allwinner,sun4i-a10-ehci", "usb-ehci";
  75 +          reg = <0x01c14000 0x100>;
  76 +          interrupts = <39>;
  77 +          clocks = <&ahb_gates 1>;
  78 +          phys = <&usbphy 1>;
  79 +          phy-names = "usb";
  80 +   };
  81 diff --git a/Documentation/devicetree/bindings/usb/via,vt8500-ehci.txt b/Documentation/devicetree/bindings/usb/via,vt8500-ehci.txt
  82 deleted file mode 100644
  83 index 17b3ad1..0000000
  84 --- a/Documentation/devicetree/bindings/usb/via,vt8500-ehci.txt
  85 +++ /dev/null
  86 @@ -1,15 +0,0 @@
  87 -VIA/Wondermedia VT8500 EHCI Controller
  88 ------------------------------------------------------
  89 -
  90 -Required properties:
  91 -- compatible : "via,vt8500-ehci"
  92 -- reg : Should contain 1 register ranges(address and length)
  93 -- interrupts : ehci controller interrupt
  94 -
  95 -Example:
  96 -
  97 -       ehci@d8007900 {
  98 -               compatible = "via,vt8500-ehci";
  99 -               reg = <0xd8007900 0x200>;
 100 -               interrupts = <43>;
 101 -       };
 102 diff --git a/Documentation/devicetree/bindings/usb/vt8500-ehci.txt b/Documentation/devicetree/bindings/usb/vt8500-ehci.txt
 103 deleted file mode 100644
 104 index 5fb8fd6..0000000
 105 --- a/Documentation/devicetree/bindings/usb/vt8500-ehci.txt
 106 +++ /dev/null
 107 @@ -1,12 +0,0 @@
 108 -VIA VT8500 and Wondermedia WM8xxx SoC USB controllers.
 109 -
 110 -Required properties:
 111 - - compatible: Should be "via,vt8500-ehci" or "wm,prizm-ehci".
 112 - - reg: Address range of the ehci registers. size should be 0x200
 113 - - interrupts: Should contain the ehci interrupt.
 114 -
 115 -usb: ehci@D8007100 {
 116 -       compatible = "wm,prizm-ehci", "usb-ehci";
 117 -       reg = <0xD8007100 0x200>;
 118 -       interrupts = <1>;
 119 -};
 120 diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
 121 index a9707da..e28cbe0 100644
 122 --- a/drivers/usb/host/Kconfig
 123 +++ b/drivers/usb/host/Kconfig
 124 @@ -255,6 +255,7 @@ config USB_EHCI_ATH79
 125
 126  config USB_EHCI_HCD_PLATFORM
 127         tristate "Generic EHCI driver for a platform device"
 128 +       depends on !PPC_OF
 129         default n
 130         ---help---
 131           Adds an EHCI host driver for a generic platform device, which
 132 diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
 133 index 01536cf..5ebd0b7 100644
 134 --- a/drivers/usb/host/ehci-platform.c
 135 +++ b/drivers/usb/host/ehci-platform.c
 136 @@ -3,6 +3,7 @@
 137   *
 138   * Copyright 2007 Steven Brown <sbrown@cortland.com>
 139   * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
 140 + * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
 141   *
 142   * Derived from the ohci-ssb driver
 143   * Copyright 2007 Michael Buesch <m@bues.ch>
 144 @@ -18,6 +19,7 @@
 145   *
 146   * Licensed under the GNU/GPL. See COPYING for details.
 147   */
 148 +#include <linux/clk.h>
 149  #include <linux/dma-mapping.h>
 150  #include <linux/err.h>
 151  #include <linux/kernel.h>
 152 @@ -25,6 +27,7 @@
 153  #include <linux/io.h>
 154  #include <linux/module.h>
 155  #include <linux/of.h>
 156 +#include <linux/phy/phy.h>
 157  #include <linux/platform_device.h>
 158  #include <linux/usb.h>
 159  #include <linux/usb/hcd.h>
 160 @@ -33,6 +36,13 @@
 161  #include "ehci.h"
 162
 163  #define DRIVER_DESC "EHCI generic platform driver"
 164 +#define EHCI_MAX_CLKS 3
 165 +#define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
 166 +
 167 +struct ehci_platform_priv {
 168 +       struct clk *clks[EHCI_MAX_CLKS];
 169 +       struct phy *phy;
 170 +};
 171
 172  static const char hcd_name[] = "ehci-platform";
 173
 174 @@ -64,38 +74,90 @@ static int ehci_platform_reset(struct usb_hcd *hcd)
 175         return 0;
 176  }
 177
 178 +static int ehci_platform_power_on(struct platform_device *dev)
 179 +{
 180 +       struct usb_hcd *hcd = platform_get_drvdata(dev);
 181 +       struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 182 +       int clk, ret;
 183 +
 184 +       for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
 185 +               ret = clk_prepare_enable(priv->clks[clk]);
 186 +               if (ret)
 187 +                       goto err_disable_clks;
 188 +       }
 189 +
 190 +       if (priv->phy) {
 191 +               ret = phy_init(priv->phy);
 192 +               if (ret)
 193 +                       goto err_disable_clks;
 194 +
 195 +               ret = phy_power_on(priv->phy);
 196 +               if (ret)
 197 +                       goto err_exit_phy;
 198 +       }
 199 +
 200 +       return 0;
 201 +
 202 +err_exit_phy:
 203 +       phy_exit(priv->phy);
 204 +err_disable_clks:
 205 +       while (--clk >= 0)
 206 +               clk_disable_unprepare(priv->clks[clk]);
 207 +
 208 +       return ret;
 209 +}
 210 +
 211 +static void ehci_platform_power_off(struct platform_device *dev)
 212 +{
 213 +       struct usb_hcd *hcd = platform_get_drvdata(dev);
 214 +       struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 215 +       int clk;
 216 +
 217 +       if (priv->phy) {
 218 +               phy_power_off(priv->phy);
 219 +               phy_exit(priv->phy);
 220 +       }
 221 +
 222 +       for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
 223 +               if (priv->clks[clk])
 224 +                       clk_disable_unprepare(priv->clks[clk]);
 225 +}
 226 +
 227  static struct hc_driver __read_mostly ehci_platform_hc_driver;
 228
 229  static const struct ehci_driver_overrides platform_overrides __initconst = {
 230 -       .reset =        ehci_platform_reset,
 231 +       .reset =                ehci_platform_reset,
 232 +       .extra_priv_size =      sizeof(struct ehci_platform_priv),
 233  };
 234
 235 -static struct usb_ehci_pdata ehci_platform_defaults;
 236 +static struct usb_ehci_pdata ehci_platform_defaults = {
 237 +       .power_on =             ehci_platform_power_on,
 238 +       .power_suspend =        ehci_platform_power_off,
 239 +       .power_off =            ehci_platform_power_off,
 240 +};
 241
 242  static int ehci_platform_probe(struct platform_device *dev)
 243  {
 244         struct usb_hcd *hcd;
 245         struct resource *res_mem;
 246 -       struct usb_ehci_pdata *pdata;
 247 -       int irq;
 248 -       int err;
 249 +       struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 250 +       struct ehci_platform_priv *priv;
 251 +       int err, irq, clk = 0;
 252
 253         if (usb_disabled())
 254                 return -ENODEV;
 255
 256         /*
 257 -        * use reasonable defaults so platforms don't have to provide these.
 258 -        * with DT probing on ARM, none of these are set.
 259 +        * Use reasonable defaults so platforms don't have to provide these
 260 +        * with DT probing on ARM.
 261          */
 262 -       if (!dev_get_platdata(&dev->dev))
 263 -               dev->dev.platform_data = &ehci_platform_defaults;
 264 +       if (!pdata)
 265 +               pdata = &ehci_platform_defaults;
 266
 267         err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
 268         if (err)
 269                 return err;
 270
 271 -       pdata = dev_get_platdata(&dev->dev);
 272 -
 273         irq = platform_get_irq(dev, 0);
 274         if (irq < 0) {
 275                 dev_err(&dev->dev, "no irq provided");
 276 @@ -107,17 +169,40 @@ static int ehci_platform_probe(struct platform_device *dev)
 277                 return -ENXIO;
 278         }
 279
 280 +       hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
 281 +                            dev_name(&dev->dev));
 282 +       if (!hcd)
 283 +               return -ENOMEM;
 284 +
 285 +       platform_set_drvdata(dev, hcd);
 286 +       dev->dev.platform_data = pdata;
 287 +       priv = hcd_to_ehci_priv(hcd);
 288 +
 289 +       if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
 290 +               priv->phy = devm_phy_get(&dev->dev, "usb");
 291 +               if (IS_ERR(priv->phy)) {
 292 +                       err = PTR_ERR(priv->phy);
 293 +                       if (err == -EPROBE_DEFER)
 294 +                               goto err_put_hcd;
 295 +                       priv->phy = NULL;
 296 +               }
 297 +
 298 +               for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
 299 +                       priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
 300 +                       if (IS_ERR(priv->clks[clk])) {
 301 +                               err = PTR_ERR(priv->clks[clk]);
 302 +                               if (err == -EPROBE_DEFER)
 303 +                                       goto err_put_clks;
 304 +                               priv->clks[clk] = NULL;
 305 +                               break;
 306 +                       }
 307 +               }
 308 +       }
 309 +
 310         if (pdata->power_on) {
 311                 err = pdata->power_on(dev);
 312                 if (err < 0)
 313 -                       return err;
 314 -       }
 315 -
 316 -       hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
 317 -                            dev_name(&dev->dev));
 318 -       if (!hcd) {
 319 -               err = -ENOMEM;
 320 -               goto err_power;
 321 +                       goto err_put_clks;
 322         }
 323
 324         hcd->rsrc_start = res_mem->start;
 325 @@ -126,22 +211,28 @@ static int ehci_platform_probe(struct platform_device *dev)
 326         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
 327         if (IS_ERR(hcd->regs)) {
 328                 err = PTR_ERR(hcd->regs);
 329 -               goto err_put_hcd;
 330 +               goto err_power;
 331         }
 332         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 333         if (err)
 334 -               goto err_put_hcd;
 335 +               goto err_power;
 336
 337         device_wakeup_enable(hcd->self.controller);
 338         platform_set_drvdata(dev, hcd);
 339
 340         return err;
 341
 342 -err_put_hcd:
 343 -       usb_put_hcd(hcd);
 344  err_power:
 345         if (pdata->power_off)
 346                 pdata->power_off(dev);
 347 +err_put_clks:
 348 +       while (--clk >= 0)
 349 +               clk_put(priv->clks[clk]);
 350 +err_put_hcd:
 351 +       if (pdata == &ehci_platform_defaults)
 352 +               dev->dev.platform_data = NULL;
 353 +
 354 +       usb_put_hcd(hcd);
 355
 356         return err;
 357  }
 358 @@ -150,13 +241,19 @@ static int ehci_platform_remove(struct platform_device *dev)
 359  {
 360         struct usb_hcd *hcd = platform_get_drvdata(dev);
 361         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 362 +       struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 363 +       int clk;
 364
 365         usb_remove_hcd(hcd);
 366 -       usb_put_hcd(hcd);
 367
 368         if (pdata->power_off)
 369                 pdata->power_off(dev);
 370
 371 +       for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
 372 +               clk_put(priv->clks[clk]);
 373 +
 374 +       usb_put_hcd(hcd);
 375 +
 376         if (pdata == &ehci_platform_defaults)
 377                 dev->dev.platform_data = NULL;
 378
 379 @@ -207,8 +304,10 @@ static int ehci_platform_resume(struct device *dev)
 380  static const struct of_device_id vt8500_ehci_ids[] = {
 381         { .compatible = "via,vt8500-ehci", },
 382         { .compatible = "wm,prizm-ehci", },
 383 +       { .compatible = "usb-ehci", },
 384         {}
 385  };
 386 +MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
 387
 388  static const struct platform_device_id ehci_platform_table[] = {
 389         { "ehci-platform", 0 },
 390 --
 391 1.8.5.5
 392