175 lines
3.7 KiB
C
175 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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#include <syscon.h>
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#include <dm.h>
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#include <errno.h>
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#include <regmap.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/root.h>
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#include <linux/err.h>
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/*
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* Caution:
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* This API requires the given device has alerady been bound to syscon driver.
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* For example,
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* compatible = "syscon", "simple-mfd";
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* works, but
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* compatible = "simple-mfd", "syscon";
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* does not. The behavior is different from Linux.
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*/
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struct regmap *syscon_get_regmap(struct udevice *dev)
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{
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struct syscon_uc_info *priv;
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if (device_get_uclass_id(dev) != UCLASS_SYSCON)
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return ERR_PTR(-ENOEXEC);
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priv = dev_get_uclass_priv(dev);
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return priv->regmap;
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}
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static int syscon_pre_probe(struct udevice *dev)
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{
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struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
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/*
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* With OF_PLATDATA we really have no way of knowing the format of
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* the device-specific platform data. So we assume that it starts with
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* a 'reg' member, and this holds a single address and size. Drivers
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* using OF_PLATDATA will need to ensure that this is true.
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*/
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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struct syscon_base_platdata *plat = dev_get_platdata(dev);
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return regmap_init_mem_platdata(dev, plat->reg, ARRAY_SIZE(plat->reg),
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&priv->regmap);
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#else
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return regmap_init_mem(dev_ofnode(dev), &priv->regmap);
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#endif
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}
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int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp)
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{
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struct udevice *dev;
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struct uclass *uc;
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int ret;
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*devp = NULL;
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ret = uclass_get(UCLASS_SYSCON, &uc);
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if (ret)
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return ret;
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uclass_foreach_dev(dev, uc) {
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if (dev->driver_data == driver_data) {
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*devp = dev;
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return device_probe(dev);
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}
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}
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return -ENODEV;
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}
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struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
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{
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struct syscon_uc_info *priv;
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struct udevice *dev;
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int ret;
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ret = syscon_get_by_driver_data(driver_data, &dev);
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if (ret)
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return ERR_PTR(ret);
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priv = dev_get_uclass_priv(dev);
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return priv->regmap;
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}
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void *syscon_get_first_range(ulong driver_data)
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{
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struct regmap *map;
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map = syscon_get_regmap_by_driver_data(driver_data);
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if (IS_ERR(map))
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return map;
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return regmap_get_range(map, 0);
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}
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UCLASS_DRIVER(syscon) = {
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.id = UCLASS_SYSCON,
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.name = "syscon",
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.per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
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.pre_probe = syscon_pre_probe,
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};
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static const struct udevice_id generic_syscon_ids[] = {
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{ .compatible = "syscon" },
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{ }
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};
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U_BOOT_DRIVER(generic_syscon) = {
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.name = "syscon",
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.id = UCLASS_SYSCON,
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#if !CONFIG_IS_ENABLED(OF_PLATDATA)
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.bind = dm_scan_fdt_dev,
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#endif
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.of_match = generic_syscon_ids,
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};
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/*
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* Linux-compatible syscon-to-regmap
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* The syscon node can be bound to another driver, but still works
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* as a syscon provider.
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*/
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static LIST_HEAD(syscon_list);
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struct syscon {
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ofnode node;
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struct regmap *regmap;
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struct list_head list;
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};
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static struct syscon *of_syscon_register(ofnode node)
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{
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struct syscon *syscon;
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int ret;
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if (!ofnode_device_is_compatible(node, "syscon"))
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return ERR_PTR(-EINVAL);
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syscon = malloc(sizeof(*syscon));
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if (!syscon)
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return ERR_PTR(-ENOMEM);
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ret = regmap_init_mem(node, &syscon->regmap);
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if (ret) {
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free(syscon);
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return ERR_PTR(ret);
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}
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list_add_tail(&syscon->list, &syscon_list);
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return syscon;
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}
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struct regmap *syscon_node_to_regmap(ofnode node)
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{
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struct syscon *entry, *syscon = NULL;
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list_for_each_entry(entry, &syscon_list, list)
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if (ofnode_equal(entry->node, node)) {
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syscon = entry;
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break;
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}
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if (!syscon)
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syscon = of_syscon_register(node);
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if (IS_ERR(syscon))
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return ERR_CAST(syscon);
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return syscon->regmap;
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}
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