LXR uboot/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
  18struct 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
  28static int syscon_pre_probe(struct udevice *dev)
  29{
  30        struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
  31
  32        /*
  33         * With OF_PLATDATA we really have no way of knowing the format of
  34         * the device-specific platform data. So we assume that it starts with
  35         * a 'reg' member, and this holds a single address and size. Drivers
  36         * using OF_PLATDATA will need to ensure that this is true.
  37         */
  38#if CONFIG_IS_ENABLED(OF_PLATDATA)
  39        struct syscon_base_platdata *plat = dev_get_platdata(dev);
  40
  41        return regmap_init_mem_platdata(dev, plat->reg, ARRAY_SIZE(plat->reg),
  42                                        &priv->regmap);
  43#else
  44        return regmap_init_mem(dev, &priv->regmap);
  45#endif
  46}
  47
  48int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp)
  49{
  50        struct udevice *dev;
  51        struct uclass *uc;
  52        int ret;
  53
  54        *devp = NULL;
  55        ret = uclass_get(UCLASS_SYSCON, &uc);
  56        if (ret)
  57                return ret;
  58        uclass_foreach_dev(dev, uc) {
  59                if (dev->driver_data == driver_data) {
  60                        *devp = dev;
  61                        return device_probe(dev);
  62                }
  63        }
  64
  65        return -ENODEV;
  66}
  67
  68struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
  69{
  70        struct syscon_uc_info *priv;
  71        struct udevice *dev;
  72        int ret;
  73
  74        ret = syscon_get_by_driver_data(driver_data, &dev);
  75        if (ret)
  76                return ERR_PTR(ret);
  77        priv = dev_get_uclass_priv(dev);
  78
  79        return priv->regmap;
  80}
  81
  82void *syscon_get_first_range(ulong driver_data)
  83{
  84        struct regmap *map;
  85
  86        map = syscon_get_regmap_by_driver_data(driver_data);
  87        if (IS_ERR(map))
  88                return map;
  89        return regmap_get_range(map, 0);
  90}
  91
  92UCLASS_DRIVER(syscon) = {
  93        .id             = UCLASS_SYSCON,
  94        .name           = "syscon",
  95        .per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
  96        .pre_probe = syscon_pre_probe,
  97};
  98
  99static const struct udevice_id generic_syscon_ids[] = {
 100        { .compatible = "syscon" },
 101        { }
 102};
 103
 104U_BOOT_DRIVER(generic_syscon) = {
 105        .name   = "syscon",
 106        .id     = UCLASS_SYSCON,
 107#if !CONFIG_IS_ENABLED(OF_PLATDATA)
 108        .bind           = dm_scan_fdt_dev,
 109#endif
 110        .of_match = generic_syscon_ids,
 111};
 112