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;
  21
  22         if (device_get_uclass_id(dev) != UCLASS_SYSCON)
  23                 return ERR_PTR(-ENOEXEC);
  24         priv = dev_get_uclass_priv(dev);
  25         return priv->regmap;
  26 }
  27
  28 static int syscon_pre_probe(struct udevice *dev)
  29 {
  30         struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
  31
  32         return regmap_init_mem(dev, &priv->regmap);
  33 }
  34
  35 struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
  36 {
  37         struct udevice *dev;
  38         struct uclass *uc;
  39         int ret;
  40
  41         ret = uclass_get(UCLASS_SYSCON, &uc);
  42         if (ret)
  43                 return ERR_PTR(ret);
  44         uclass_foreach_dev(dev, uc) {
  45                 if (dev->driver_data == driver_data) {
  46                         struct syscon_uc_info *priv;
  47                         int ret;
  48
  49                         ret = device_probe(dev);
  50                         if (ret)
  51                                 return ERR_PTR(ret);
  52                         priv = dev_get_uclass_priv(dev);
  53
  54                         return priv->regmap;
  55                 }
  56         }
  57
  58         return ERR_PTR(-ENODEV);
  59 }
  60
  61 void *syscon_get_first_range(ulong driver_data)
  62 {
  63         struct regmap *map;
  64
  65         map = syscon_get_regmap_by_driver_data(driver_data);
  66         if (IS_ERR(map))
  67                 return map;
  68         return regmap_get_range(map, 0);
  69 }
  70
  71 UCLASS_DRIVER(syscon) = {
  72         .id             = UCLASS_SYSCON,
  73         .name           = "syscon",
  74         .per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
  75         .pre_probe = syscon_pre_probe,
  76 };