diff options
Diffstat (limited to 'drivers/power/reset/brcmstb-reboot.c')
| -rw-r--r-- | drivers/power/reset/brcmstb-reboot.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/power/reset/brcmstb-reboot.c b/drivers/power/reset/brcmstb-reboot.c new file mode 100644 index 000000000..884b53c48 --- /dev/null +++ b/drivers/power/reset/brcmstb-reboot.c @@ -0,0 +1,156 @@ +/* + * 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); |