cf8c39b00e
There may be other backup reset methods available, do not halt here so that other reset methods can be tried. Signed-off-by: Andrew Davis <afd@ti.com> Reviewed-by: Dhruva Gole <d-gole@ti.com> Acked-by: Florian Fainelli <florian.fainelli@broadcom.com> Link: https://lore.kernel.org/r/20240610142836.168603-5-afd@ti.com Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (C) 2013 Broadcom Corporation
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/jiffies.h>
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#include <linux/notifier.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/printk.h>
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#include <linux/reboot.h>
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#include <linux/regmap.h>
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#include <linux/smp.h>
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#include <linux/mfd/syscon.h>
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static struct regmap *regmap;
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static u32 rst_src_en;
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static u32 sw_mstr_rst;
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struct reset_reg_mask {
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u32 rst_src_en_mask;
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u32 sw_mstr_rst_mask;
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};
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static const struct reset_reg_mask *reset_masks;
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static int brcmstb_restart_handler(struct sys_off_data *data)
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{
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int rc;
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u32 tmp;
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rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask);
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if (rc) {
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pr_err("failed to write rst_src_en (%d)\n", rc);
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return NOTIFY_DONE;
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}
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rc = regmap_read(regmap, rst_src_en, &tmp);
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if (rc) {
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pr_err("failed to read rst_src_en (%d)\n", rc);
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return NOTIFY_DONE;
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}
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rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask);
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if (rc) {
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pr_err("failed to write sw_mstr_rst (%d)\n", rc);
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return NOTIFY_DONE;
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}
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rc = regmap_read(regmap, sw_mstr_rst, &tmp);
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if (rc) {
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pr_err("failed to read sw_mstr_rst (%d)\n", rc);
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return NOTIFY_DONE;
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}
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return NOTIFY_DONE;
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}
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static const struct reset_reg_mask reset_bits_40nm = {
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.rst_src_en_mask = BIT(0),
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.sw_mstr_rst_mask = BIT(0),
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};
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static const struct reset_reg_mask reset_bits_65nm = {
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.rst_src_en_mask = BIT(3),
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.sw_mstr_rst_mask = BIT(31),
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};
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static int brcmstb_reboot_probe(struct platform_device *pdev)
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{
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int rc;
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struct device_node *np = pdev->dev.of_node;
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unsigned int args[2];
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reset_masks = device_get_match_data(&pdev->dev);
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if (!reset_masks) {
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pr_err("failed to get match data\n");
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return -EINVAL;
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}
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regmap = syscon_regmap_lookup_by_phandle_args(np, "syscon", ARRAY_SIZE(args), args);
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if (IS_ERR(regmap)) {
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pr_err("failed to get syscon phandle\n");
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return -EINVAL;
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}
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rst_src_en = args[0];
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sw_mstr_rst = args[1];
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rc = devm_register_sys_off_handler(&pdev->dev, SYS_OFF_MODE_RESTART,
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128, brcmstb_restart_handler, NULL);
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if (rc)
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dev_err(&pdev->dev,
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"cannot register restart handler (err=%d)\n", rc);
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return rc;
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}
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static const struct of_device_id of_match[] = {
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{ .compatible = "brcm,brcmstb-reboot", .data = &reset_bits_40nm },
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{ .compatible = "brcm,bcm7038-reboot", .data = &reset_bits_65nm },
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{},
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};
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static struct platform_driver brcmstb_reboot_driver = {
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.probe = brcmstb_reboot_probe,
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.driver = {
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.name = "brcmstb-reboot",
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.of_match_table = of_match,
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},
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};
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static int __init brcmstb_reboot_init(void)
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{
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return platform_driver_register(&brcmstb_reboot_driver);
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}
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subsys_initcall(brcmstb_reboot_init);
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