mirror of
https://github.com/AsahiLinux/u-boot
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9cdfade85e
Per the DT binding, <mask> and <value> property can have either one or both, and if <value> is missing, <mask> should be used, which is what current U-Boot sysreset_syscon driver supports. This adds support to the <value> property to the driver, and <mask> semantics is updated to really be a mask to the value if both exist. Signed-off-by: Bin Meng <bin.meng@windriver.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Pragnesh Patel <pragnesh.patel@sifive.com>
92 lines
2.2 KiB
C
92 lines
2.2 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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#include <linux/err.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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unsigned int value;
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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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ulong driver_data = dev_get_driver_data(dev);
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if (type != driver_data)
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return -EPROTONOSUPPORT;
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regmap_update_bits(priv->regmap, priv->offset, priv->mask, priv->value);
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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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int mask_err, value_err;
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priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap");
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if (IS_ERR(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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err = dev_read_u32(dev, "offset", &priv->offset);
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if (err) {
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pr_err("unable to find offset\n");
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return -ENOENT;
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}
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mask_err = dev_read_u32(dev, "mask", &priv->mask);
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value_err = dev_read_u32(dev, "value", &priv->value);
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if (mask_err && value_err) {
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pr_err("unable to find mask and value\n");
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return -EINVAL;
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}
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if (value_err) {
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/* support old binding */
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priv->value = priv->mask;
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priv->mask = 0xffffffff;
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} else if (mask_err) {
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/* support value without mask*/
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priv->mask = 0xffffffff;
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}
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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", .data = SYSRESET_COLD },
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{ .compatible = "syscon-poweroff", .data = SYSRESET_POWER_OFF },
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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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