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156 lines
3.7 KiB
156 lines
3.7 KiB
/* |
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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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