76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
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*
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* Derived from linux/drivers/power/reset/syscon-reboot.c:
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* Copyright (C) 2013, Applied Micro Circuits Corporation
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* Author: Feng Kan <fkan@apm.com>
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*/
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#include <common.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 <sysreset.h>
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#include <syscon.h>
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struct syscon_reboot_priv {
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struct regmap *regmap;
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unsigned int offset;
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unsigned int mask;
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};
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static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type)
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{
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struct syscon_reboot_priv *priv = dev_get_priv(dev);
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regmap_write(priv->regmap, priv->offset, priv->mask);
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return -EINPROGRESS;
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}
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static struct sysreset_ops syscon_reboot_ops = {
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.request = syscon_reboot_request,
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};
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int syscon_reboot_probe(struct udevice *dev)
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{
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struct syscon_reboot_priv *priv = dev_get_priv(dev);
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int err;
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u32 phandle;
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ofnode node;
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err = ofnode_read_u32(dev_ofnode(dev), "regmap", &phandle);
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if (err)
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return err;
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node = ofnode_get_by_phandle(phandle);
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if (!ofnode_valid(node))
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return -EINVAL;
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priv->regmap = syscon_node_to_regmap(node);
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if (!priv->regmap) {
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pr_err("unable to find regmap\n");
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return -ENODEV;
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}
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priv->offset = dev_read_u32_default(dev, "offset", 0);
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priv->mask = dev_read_u32_default(dev, "mask", 0);
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return 0;
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}
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static const struct udevice_id syscon_reboot_ids[] = {
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{ .compatible = "syscon-reboot" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(syscon_reboot) = {
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.name = "syscon_reboot",
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.id = UCLASS_SYSRESET,
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.of_match = syscon_reboot_ids,
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.probe = syscon_reboot_probe,
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.priv_auto_alloc_size = sizeof(struct syscon_reboot_priv),
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.ops = &syscon_reboot_ops,
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};
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