[linux-2.6-block.git] / drivers / power / reset / arm-versatile-reboot.c

/*
 * Copyright (C) 2014 Linaro Ltd.
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2, as
 * published by the Free Software Foundation.
 *
 */
#include <linux/init.h>
#include <linux/mfd/syscon.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
#include <linux/of.h>

#define INTEGRATOR_HDR_CTRL_OFFSET	0x0C
#define INTEGRATOR_HDR_LOCK_OFFSET	0x14
#define INTEGRATOR_CM_CTRL_RESET	(1 << 3)

#define VERSATILE_SYS_LOCK_OFFSET	0x20
#define VERSATILE_SYS_RESETCTL_OFFSET	0x40

/* Magic unlocking token used on all Versatile boards */
#define VERSATILE_LOCK_VAL		0xA05F

/*
 * We detect the different syscon types from the compatible strings.
 */
enum versatile_reboot {
	INTEGRATOR_REBOOT_CM,
	VERSATILE_REBOOT_CM,
	REALVIEW_REBOOT_EB,
	REALVIEW_REBOOT_PB1176,
	REALVIEW_REBOOT_PB11MP,
	REALVIEW_REBOOT_PBA8,
	REALVIEW_REBOOT_PBX,
};

/* Pointer to the system controller */
static struct regmap *syscon_regmap;
static enum versatile_reboot versatile_reboot_type;

static const struct of_device_id versatile_reboot_of_match[] = {
	{
		.compatible = "arm,core-module-integrator",
		.data = (void *)INTEGRATOR_REBOOT_CM
	},
	{
		.compatible = "arm,core-module-versatile",
		.data = (void *)VERSATILE_REBOOT_CM,
	},
	{
		.compatible = "arm,realview-eb-syscon",
		.data = (void *)REALVIEW_REBOOT_EB,
	},
	{
		.compatible = "arm,realview-pb1176-syscon",
		.data = (void *)REALVIEW_REBOOT_PB1176,
	},
	{
		.compatible = "arm,realview-pb11mp-syscon",
		.data = (void *)REALVIEW_REBOOT_PB11MP,
	},
	{
		.compatible = "arm,realview-pba8-syscon",
		.data = (void *)REALVIEW_REBOOT_PBA8,
	},
	{
		.compatible = "arm,realview-pbx-syscon",
		.data = (void *)REALVIEW_REBOOT_PBX,
	},
	{},
};

static int versatile_reboot(struct notifier_block *this, unsigned long mode,
			    void *cmd)
{
	/* Unlock the reset register */
	/* Then hit reset on the different machines */
	switch (versatile_reboot_type) {
	case INTEGRATOR_REBOOT_CM:
		regmap_write(syscon_regmap, INTEGRATOR_HDR_LOCK_OFFSET,
			     VERSATILE_LOCK_VAL);
		regmap_update_bits(syscon_regmap,
				   INTEGRATOR_HDR_CTRL_OFFSET,
				   INTEGRATOR_CM_CTRL_RESET,
				   INTEGRATOR_CM_CTRL_RESET);
		break;
	case VERSATILE_REBOOT_CM:
		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
			     VERSATILE_LOCK_VAL);
		regmap_update_bits(syscon_regmap,
				   VERSATILE_SYS_RESETCTL_OFFSET,
				   0x0107,
				   0x0105);
		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
			     0);
		break;
	case REALVIEW_REBOOT_EB:
		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
			     VERSATILE_LOCK_VAL);
		regmap_write(syscon_regmap,
			     VERSATILE_SYS_RESETCTL_OFFSET, 0x0008);
		break;
	case REALVIEW_REBOOT_PB1176:
		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
			     VERSATILE_LOCK_VAL);
		regmap_write(syscon_regmap,
			     VERSATILE_SYS_RESETCTL_OFFSET, 0x0100);
		break;
	case REALVIEW_REBOOT_PB11MP:
	case REALVIEW_REBOOT_PBA8:
		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
			     VERSATILE_LOCK_VAL);
		regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
			     0x0000);
		regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
			     0x0004);
		break;
	case REALVIEW_REBOOT_PBX:
		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
			     VERSATILE_LOCK_VAL);
		regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
			     0x00f0);
		regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
			     0x00f4);
		break;
	}
	dsb();

	return NOTIFY_DONE;
}

static struct notifier_block versatile_reboot_nb = {
	.notifier_call = versatile_reboot,
	.priority = 192,
};

static int __init versatile_reboot_probe(void)
{
	const struct of_device_id *reboot_id;
	struct device_node *np;
	int err;

	np = of_find_matching_node_and_match(NULL, versatile_reboot_of_match,
						 &reboot_id);
	if (!np)
		return -ENODEV;
	versatile_reboot_type = (enum versatile_reboot)reboot_id->data;

	syscon_regmap = syscon_node_to_regmap(np);
	if (IS_ERR(syscon_regmap))
		return PTR_ERR(syscon_regmap);

	err = register_restart_handler(&versatile_reboot_nb);
	if (err)
		return err;

	pr_info("versatile reboot driver registered\n");
	return 0;
}
device_initcall(versatile_reboot_probe);
Commit	Line	Data
0e545f57 LW	1	/*
	2	* Copyright (C) 2014 Linaro Ltd.
	3	*
	4	* Author: Linus Walleij <linus.walleij@linaro.org>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2, as
	8	* published by the Free Software Foundation.
	9	*
	10	*/
	11	#include <linux/init.h>
	12	#include <linux/mfd/syscon.h>
	13	#include <linux/reboot.h>
	14	#include <linux/regmap.h>
	15	#include <linux/of.h>
0e545f57	16
0160817d LW	17	#define INTEGRATOR_HDR_CTRL_OFFSET 0x0C
	18	#define INTEGRATOR_HDR_LOCK_OFFSET 0x14
	19	#define INTEGRATOR_CM_CTRL_RESET (1 << 3)
	20
3f652c96 LW	21	#define VERSATILE_SYS_LOCK_OFFSET 0x20
3f652c96 LW	22	#define VERSATILE_SYS_RESETCTL_OFFSET 0x40
0e545f57	23
0160817d LW	24	/* Magic unlocking token used on all Versatile boards */
	25	#define VERSATILE_LOCK_VAL 0xA05F
	26
0e545f57 LW	27	/*
	28	* We detect the different syscon types from the compatible strings.
	29	*/
	30	enum versatile_reboot {
0160817d	31	INTEGRATOR_REBOOT_CM,
3f652c96	32	VERSATILE_REBOOT_CM,
0e545f57 LW	33	REALVIEW_REBOOT_EB,
	34	REALVIEW_REBOOT_PB1176,
	35	REALVIEW_REBOOT_PB11MP,
	36	REALVIEW_REBOOT_PBA8,
	37	REALVIEW_REBOOT_PBX,
	38	};
	39
	40	/* Pointer to the system controller */
	41	static struct regmap *syscon_regmap;
	42	static enum versatile_reboot versatile_reboot_type;
	43
	44	static const struct of_device_id versatile_reboot_of_match[] = {
0160817d LW	45	{
	46	.compatible = "arm,core-module-integrator",
	47	.data = (void *)INTEGRATOR_REBOOT_CM
	48	},
3f652c96 LW	49	{
	50	.compatible = "arm,core-module-versatile",
	51	.data = (void *)VERSATILE_REBOOT_CM,
	52	},
0e545f57 LW	53	{
	54	.compatible = "arm,realview-eb-syscon",
	55	.data = (void *)REALVIEW_REBOOT_EB,
	56	},
	57	{
	58	.compatible = "arm,realview-pb1176-syscon",
	59	.data = (void *)REALVIEW_REBOOT_PB1176,
	60	},
	61	{
	62	.compatible = "arm,realview-pb11mp-syscon",
	63	.data = (void *)REALVIEW_REBOOT_PB11MP,
	64	},
	65	{
	66	.compatible = "arm,realview-pba8-syscon",
	67	.data = (void *)REALVIEW_REBOOT_PBA8,
	68	},
	69	{
	70	.compatible = "arm,realview-pbx-syscon",
	71	.data = (void *)REALVIEW_REBOOT_PBX,
	72	},
0160817d	73	{},
0e545f57 LW	74	};
0e545f57 LW	75
25a5b57d GR	76	static int versatile_reboot(struct notifier_block *this, unsigned long mode,
25a5b57d GR	77	void *cmd)
0e545f57 LW	78	{
0e545f57 LW	79	/* Unlock the reset register */
0e545f57 LW	80	/* Then hit reset on the different machines */
0e545f57 LW	81	switch (versatile_reboot_type) {
0160817d LW	82	case INTEGRATOR_REBOOT_CM:
	83	regmap_write(syscon_regmap, INTEGRATOR_HDR_LOCK_OFFSET,
	84	VERSATILE_LOCK_VAL);
	85	regmap_update_bits(syscon_regmap,
	86	INTEGRATOR_HDR_CTRL_OFFSET,
	87	INTEGRATOR_CM_CTRL_RESET,
	88	INTEGRATOR_CM_CTRL_RESET);
	89	break;
3f652c96 LW	90	case VERSATILE_REBOOT_CM:
	91	regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
	92	VERSATILE_LOCK_VAL);
	93	regmap_update_bits(syscon_regmap,
	94	VERSATILE_SYS_RESETCTL_OFFSET,
	95	0x0107,
	96	0x0105);
	97	regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
	98	0);
	99	break;
0e545f57	100	case REALVIEW_REBOOT_EB:
3f652c96	101	regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
0160817d	102	VERSATILE_LOCK_VAL);
0e545f57	103	regmap_write(syscon_regmap,
3f652c96	104	VERSATILE_SYS_RESETCTL_OFFSET, 0x0008);
0e545f57 LW	105	break;
0e545f57 LW	106	case REALVIEW_REBOOT_PB1176:
3f652c96	107	regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
0160817d	108	VERSATILE_LOCK_VAL);
0e545f57	109	regmap_write(syscon_regmap,
3f652c96	110	VERSATILE_SYS_RESETCTL_OFFSET, 0x0100);
0e545f57 LW	111	break;
	112	case REALVIEW_REBOOT_PB11MP:
	113	case REALVIEW_REBOOT_PBA8:
3f652c96	114	regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
0160817d	115	VERSATILE_LOCK_VAL);
3f652c96	116	regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
0e545f57	117	0x0000);
3f652c96	118	regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
0e545f57 LW	119	0x0004);
	120	break;
	121	case REALVIEW_REBOOT_PBX:
3f652c96	122	regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
0160817d	123	VERSATILE_LOCK_VAL);
3f652c96	124	regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
0e545f57	125	0x00f0);
3f652c96	126	regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
0e545f57 LW	127	0x00f4);
	128	break;
	129	}
	130	dsb();
25a5b57d GR	131
25a5b57d GR	132	return NOTIFY_DONE;
0e545f57 LW	133	}
0e545f57 LW	134
25a5b57d GR	135	static struct notifier_block versatile_reboot_nb = {
	136	.notifier_call = versatile_reboot,
	137	.priority = 192,
	138	};
	139
0e545f57 LW	140	static int __init versatile_reboot_probe(void)
	141	{
	142	const struct of_device_id *reboot_id;
	143	struct device_node *np;
25a5b57d	144	int err;
0e545f57 LW	145
	146	np = of_find_matching_node_and_match(NULL, versatile_reboot_of_match,
	147	&reboot_id);
	148	if (!np)
	149	return -ENODEV;
	150	versatile_reboot_type = (enum versatile_reboot)reboot_id->data;
	151
	152	syscon_regmap = syscon_node_to_regmap(np);
	153	if (IS_ERR(syscon_regmap))
	154	return PTR_ERR(syscon_regmap);
	155
25a5b57d GR	156	err = register_restart_handler(&versatile_reboot_nb);
	157	if (err)
	158	return err;
	159
0e545f57 LW	160	pr_info("versatile reboot driver registered\n");
	161	return 0;
	162	}
	163	device_initcall(versatile_reboot_probe);