157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/*
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* Copyright (C) 2013 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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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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#define RESET_SOURCE_ENABLE_REG 1
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#define SW_MASTER_RESET_REG 2
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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 notifier_block *this,
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unsigned long mode, void *cmd)
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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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while (1)
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;
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return NOTIFY_DONE;
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}
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static struct notifier_block brcmstb_restart_nb = {
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.notifier_call = brcmstb_restart_handler,
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.priority = 128,
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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 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 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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const struct of_device_id *of_id;
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of_id = of_match_node(of_match, np);
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if (!of_id) {
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pr_err("failed to look up compatible string\n");
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return -EINVAL;
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}
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reset_masks = of_id->data;
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regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
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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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rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG,
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&rst_src_en);
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if (rc) {
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pr_err("can't get rst_src_en offset (%d)\n", rc);
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return -EINVAL;
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}
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rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG,
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&sw_mstr_rst);
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if (rc) {
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pr_err("can't get sw_mstr_rst offset (%d)\n", rc);
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return -EINVAL;
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}
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rc = register_restart_handler(&brcmstb_restart_nb);
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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 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_probe(&brcmstb_reboot_driver,
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brcmstb_reboot_probe);
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}
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subsys_initcall(brcmstb_reboot_init);
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