git.sur5r.net Git - u-boot/blob - drivers/core/syscon-uclass.c

   1 /*
   2  * Copyright (C) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <syscon.h>
  10 #include <dm.h>
  11 #include <errno.h>
  12 #include <regmap.h>
  13 #include <dm/device-internal.h>
  14 #include <dm/lists.h>
  15 #include <dm/root.h>
  16 #include <linux/err.h>
  17
  18 struct regmap *syscon_get_regmap(struct udevice *dev)
  19 {
  20         struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
  21
  22         return priv->regmap;
  23 }
  24
  25 static int syscon_pre_probe(struct udevice *dev)
  26 {
  27         struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
  28
  29         return regmap_init_mem(dev, &priv->regmap);
  30 }
  31
  32 struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
  33 {
  34         struct udevice *dev;
  35         struct uclass *uc;
  36         int ret;
  37
  38         ret = uclass_get(UCLASS_SYSCON, &uc);
  39         if (ret)
  40                 return ERR_PTR(ret);
  41         uclass_foreach_dev(dev, uc) {
  42                 if (dev->driver_data == driver_data) {
  43                         struct syscon_uc_info *priv;
  44                         int ret;
  45
  46                         ret = device_probe(dev);
  47                         if (ret)
  48                                 return ERR_PTR(ret);
  49                         priv = dev_get_uclass_priv(dev);
  50
  51                         return priv->regmap;
  52                 }
  53         }
  54
  55         return ERR_PTR(-ENOENT);
  56 }
  57
  58 void *syscon_get_first_range(ulong driver_data)
  59 {
  60         struct regmap *map;
  61
  62         map = syscon_get_regmap_by_driver_data(driver_data);
  63         if (IS_ERR(map))
  64                 return map;
  65         return regmap_get_range(map, 0);
  66 }
  67
  68 UCLASS_DRIVER(syscon) = {
  69         .id             = UCLASS_SYSCON,
  70         .name           = "syscon",
  71         .per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
  72         .pre_probe = syscon_pre_probe,
  73 };