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https://github.com/AsahiLinux/u-boot
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
92 lines
2.1 KiB
C
92 lines
2.1 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 = sizeof(struct syscon_reboot_priv),
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.ops = &syscon_reboot_ops,
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};
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