// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2014 Linaro Ltd.
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*/
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#include <linux/init.h>
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#include <linux/mfd/syscon.h>
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#include <linux/reboot.h>
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#include <linux/regmap.h>
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#include <linux/of.h>
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#define INTEGRATOR_HDR_CTRL_OFFSET 0x0C
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#define INTEGRATOR_HDR_LOCK_OFFSET 0x14
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#define INTEGRATOR_CM_CTRL_RESET (1 << 3)
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#define VERSATILE_SYS_LOCK_OFFSET 0x20
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#define VERSATILE_SYS_RESETCTL_OFFSET 0x40
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/* Magic unlocking token used on all Versatile boards */
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#define VERSATILE_LOCK_VAL 0xA05F
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/*
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* We detect the different syscon types from the compatible strings.
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*/
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enum versatile_reboot {
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INTEGRATOR_REBOOT_CM,
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VERSATILE_REBOOT_CM,
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REALVIEW_REBOOT_EB,
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REALVIEW_REBOOT_PB1176,
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REALVIEW_REBOOT_PB11MP,
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REALVIEW_REBOOT_PBA8,
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REALVIEW_REBOOT_PBX,
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};
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/* Pointer to the system controller */
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static struct regmap *syscon_regmap;
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static enum versatile_reboot versatile_reboot_type;
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static const struct of_device_id versatile_reboot_of_match[] = {
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{
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.compatible = "arm,core-module-integrator",
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.data = (void *)INTEGRATOR_REBOOT_CM
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},
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{
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.compatible = "arm,core-module-versatile",
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.data = (void *)VERSATILE_REBOOT_CM,
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},
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{
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.compatible = "arm,realview-eb-syscon",
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.data = (void *)REALVIEW_REBOOT_EB,
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},
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{
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.compatible = "arm,realview-pb1176-syscon",
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.data = (void *)REALVIEW_REBOOT_PB1176,
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},
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{
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.compatible = "arm,realview-pb11mp-syscon",
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.data = (void *)REALVIEW_REBOOT_PB11MP,
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},
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{
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.compatible = "arm,realview-pba8-syscon",
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.data = (void *)REALVIEW_REBOOT_PBA8,
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},
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{
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.compatible = "arm,realview-pbx-syscon",
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.data = (void *)REALVIEW_REBOOT_PBX,
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},
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{},
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};
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static int versatile_reboot(struct notifier_block *this, unsigned long mode,
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void *cmd)
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{
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/* Unlock the reset register */
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/* Then hit reset on the different machines */
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switch (versatile_reboot_type) {
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case INTEGRATOR_REBOOT_CM:
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regmap_write(syscon_regmap, INTEGRATOR_HDR_LOCK_OFFSET,
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VERSATILE_LOCK_VAL);
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regmap_update_bits(syscon_regmap,
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INTEGRATOR_HDR_CTRL_OFFSET,
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INTEGRATOR_CM_CTRL_RESET,
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INTEGRATOR_CM_CTRL_RESET);
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break;
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case VERSATILE_REBOOT_CM:
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regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
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VERSATILE_LOCK_VAL);
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regmap_update_bits(syscon_regmap,
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VERSATILE_SYS_RESETCTL_OFFSET,
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0x0107,
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0x0105);
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regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
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0);
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break;
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case REALVIEW_REBOOT_EB:
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regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
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VERSATILE_LOCK_VAL);
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regmap_write(syscon_regmap,
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VERSATILE_SYS_RESETCTL_OFFSET, 0x0008);
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break;
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case REALVIEW_REBOOT_PB1176:
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regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
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VERSATILE_LOCK_VAL);
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regmap_write(syscon_regmap,
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VERSATILE_SYS_RESETCTL_OFFSET, 0x0100);
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break;
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case REALVIEW_REBOOT_PB11MP:
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case REALVIEW_REBOOT_PBA8:
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regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
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VERSATILE_LOCK_VAL);
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regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
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0x0000);
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regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
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0x0004);
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break;
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case REALVIEW_REBOOT_PBX:
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regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
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VERSATILE_LOCK_VAL);
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regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
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0x00f0);
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regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
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0x00f4);
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break;
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}
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dsb();
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return NOTIFY_DONE;
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}
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static struct notifier_block versatile_reboot_nb = {
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.notifier_call = versatile_reboot,
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.priority = 192,
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};
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static int __init versatile_reboot_probe(void)
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{
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const struct of_device_id *reboot_id;
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struct device_node *np;
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int err;
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np = of_find_matching_node_and_match(NULL, versatile_reboot_of_match,
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&reboot_id);
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if (!np)
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return -ENODEV;
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versatile_reboot_type = (enum versatile_reboot)reboot_id->data;
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syscon_regmap = syscon_node_to_regmap(np);
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of_node_put(np);
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if (IS_ERR(syscon_regmap))
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return PTR_ERR(syscon_regmap);
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err = register_restart_handler(&versatile_reboot_nb);
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if (err)
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return err;
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pr_info("versatile reboot driver registered\n");
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return 0;
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}
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device_initcall(versatile_reboot_probe);
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