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- /*
- * Copyright (C) 2013 Broadcom Corporation
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #include <linux/bitops.h>
- #include <linux/device.h>
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/io.h>
- #include <linux/jiffies.h>
- #include <linux/notifier.h>
- #include <linux/of_address.h>
- #include <linux/of_irq.h>
- #include <linux/of_platform.h>
- #include <linux/platform_device.h>
- #include <linux/printk.h>
- #include <linux/reboot.h>
- #include <linux/regmap.h>
- #include <linux/smp.h>
- #include <linux/mfd/syscon.h>
- #define RESET_SOURCE_ENABLE_REG 1
- #define SW_MASTER_RESET_REG 2
- static struct regmap *regmap;
- static u32 rst_src_en;
- static u32 sw_mstr_rst;
- struct reset_reg_mask {
- u32 rst_src_en_mask;
- u32 sw_mstr_rst_mask;
- };
- static const struct reset_reg_mask *reset_masks;
- static int brcmstb_restart_handler(struct notifier_block *this,
- unsigned long mode, void *cmd)
- {
- int rc;
- u32 tmp;
- rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask);
- if (rc) {
- pr_err("failed to write rst_src_en (%d)\n", rc);
- return NOTIFY_DONE;
- }
- rc = regmap_read(regmap, rst_src_en, &tmp);
- if (rc) {
- pr_err("failed to read rst_src_en (%d)\n", rc);
- return NOTIFY_DONE;
- }
- rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask);
- if (rc) {
- pr_err("failed to write sw_mstr_rst (%d)\n", rc);
- return NOTIFY_DONE;
- }
- rc = regmap_read(regmap, sw_mstr_rst, &tmp);
- if (rc) {
- pr_err("failed to read sw_mstr_rst (%d)\n", rc);
- return NOTIFY_DONE;
- }
- while (1)
- ;
- return NOTIFY_DONE;
- }
- static struct notifier_block brcmstb_restart_nb = {
- .notifier_call = brcmstb_restart_handler,
- .priority = 128,
- };
- static const struct reset_reg_mask reset_bits_40nm = {
- .rst_src_en_mask = BIT(0),
- .sw_mstr_rst_mask = BIT(0),
- };
- static const struct reset_reg_mask reset_bits_65nm = {
- .rst_src_en_mask = BIT(3),
- .sw_mstr_rst_mask = BIT(31),
- };
- static const struct of_device_id of_match[] = {
- { .compatible = "brcm,brcmstb-reboot", .data = &reset_bits_40nm },
- { .compatible = "brcm,bcm7038-reboot", .data = &reset_bits_65nm },
- {},
- };
- static int brcmstb_reboot_probe(struct platform_device *pdev)
- {
- int rc;
- struct device_node *np = pdev->dev.of_node;
- const struct of_device_id *of_id;
- of_id = of_match_node(of_match, np);
- if (!of_id) {
- pr_err("failed to look up compatible string\n");
- return -EINVAL;
- }
- reset_masks = of_id->data;
- regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
- if (IS_ERR(regmap)) {
- pr_err("failed to get syscon phandle\n");
- return -EINVAL;
- }
- rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG,
- &rst_src_en);
- if (rc) {
- pr_err("can't get rst_src_en offset (%d)\n", rc);
- return -EINVAL;
- }
- rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG,
- &sw_mstr_rst);
- if (rc) {
- pr_err("can't get sw_mstr_rst offset (%d)\n", rc);
- return -EINVAL;
- }
- rc = register_restart_handler(&brcmstb_restart_nb);
- if (rc)
- dev_err(&pdev->dev,
- "cannot register restart handler (err=%d)\n", rc);
- return rc;
- }
- static struct platform_driver brcmstb_reboot_driver = {
- .probe = brcmstb_reboot_probe,
- .driver = {
- .name = "brcmstb-reboot",
- .of_match_table = of_match,
- },
- };
- static int __init brcmstb_reboot_init(void)
- {
- return platform_driver_probe(&brcmstb_reboot_driver,
- brcmstb_reboot_probe);
- }
- subsys_initcall(brcmstb_reboot_init);
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