[deliverable/linux.git] / arch / mips / lantiq / xway / reset.c

/*
 *  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.
 *
 *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
 */

#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/pm.h>
#include <linux/export.h>
#include <linux/delay.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>

#include <asm/reboot.h>

#include <lantiq_soc.h>

#include "../prom.h"

#define ltq_rcu_w32(x, y)	ltq_w32((x), ltq_rcu_membase + (y))
#define ltq_rcu_r32(x)		ltq_r32(ltq_rcu_membase + (x))

/* reset request register */
#define RCU_RST_REQ		0x0010
/* reset status register */
#define RCU_RST_STAT		0x0014

/* reboot bit */
#define RCU_RD_SRST		BIT(30)
/* reset cause */
#define RCU_STAT_SHIFT		26
/* boot selection */
#define RCU_BOOT_SEL(x)		((x >> 18) & 0x7)
#define RCU_BOOT_SEL_XRX200(x)	(((x >> 17) & 0xf) | ((x >> 8) & 0x10))

/* remapped base addr of the reset control unit */
static void __iomem *ltq_rcu_membase;
static struct device_node *ltq_rcu_np;

/* This function is used by the watchdog driver */
int ltq_reset_cause(void)
{
	u32 val = ltq_rcu_r32(RCU_RST_STAT);
	return val >> RCU_STAT_SHIFT;
}
EXPORT_SYMBOL_GPL(ltq_reset_cause);

/* allow platform code to find out what source we booted from */
unsigned char ltq_boot_select(void)
{
	u32 val = ltq_rcu_r32(RCU_RST_STAT);

	if (of_device_is_compatible(ltq_rcu_np, "lantiq,rcu-xrx200"))
		return RCU_BOOT_SEL_XRX200(val);

	return RCU_BOOT_SEL(val);
}

/* reset a io domain for u micro seconds */
void ltq_reset_once(unsigned int module, ulong u)
{
	ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) | module, RCU_RST_REQ);
	udelay(u);
	ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) & ~module, RCU_RST_REQ);
}

static void ltq_machine_restart(char *command)
{
	local_irq_disable();
	ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) | RCU_RD_SRST, RCU_RST_REQ);
	unreachable();
}

static void ltq_machine_halt(void)
{
	local_irq_disable();
	unreachable();
}

static void ltq_machine_power_off(void)
{
	local_irq_disable();
	unreachable();
}

static int __init mips_reboot_setup(void)
{
	struct resource res;

	ltq_rcu_np = of_find_compatible_node(NULL, NULL, "lantiq,rcu-xway");
	if (!ltq_rcu_np)
		ltq_rcu_np = of_find_compatible_node(NULL, NULL,
							"lantiq,rcu-xrx200");

	/* check if all the reset register range is available */
	if (!ltq_rcu_np)
		panic("Failed to load reset resources from devicetree");

	if (of_address_to_resource(ltq_rcu_np, 0, &res))
		panic("Failed to get rcu memory range");

	if (request_mem_region(res.start, resource_size(&res), res.name) < 0)
		pr_err("Failed to request rcu memory");

	ltq_rcu_membase = ioremap_nocache(res.start, resource_size(&res));
	if (!ltq_rcu_membase)
		panic("Failed to remap core memory");

	_machine_restart = ltq_machine_restart;
	_machine_halt = ltq_machine_halt;
	pm_power_off = ltq_machine_power_off;

	return 0;
}

arch_initcall(mips_reboot_setup);
Commit	Line	Data
8ec6d935 JC	1	/*
	2	* This program is free software; you can redistribute it and/or modify it
	3	* under the terms of the GNU General Public License version 2 as published
	4	* by the Free Software Foundation.
	5	*
	6	* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
	7	*/
	8
	9	#include <linux/init.h>
	10	#include <linux/io.h>
	11	#include <linux/ioport.h>
	12	#include <linux/pm.h>
4af92e7a	13	#include <linux/export.h>
6697c693 JC	14	#include <linux/delay.h>
	15	#include <linux/of_address.h>
	16	#include <linux/of_platform.h>
	17
8ec6d935 JC	18	#include <asm/reboot.h>
	19
	20	#include <lantiq_soc.h>
	21
6697c693 JC	22	#include "../prom.h"
6697c693 JC	23
8ec6d935 JC	24	#define ltq_rcu_w32(x, y) ltq_w32((x), ltq_rcu_membase + (y))
	25	#define ltq_rcu_r32(x) ltq_r32(ltq_rcu_membase + (x))
	26
6697c693 JC	27	/* reset request register */
	28	#define RCU_RST_REQ 0x0010
	29	/* reset status register */
	30	#define RCU_RST_STAT 0x0014
8ec6d935	31
6697c693 JC	32	/* reboot bit */
	33	#define RCU_RD_SRST BIT(30)
	34	/* reset cause */
	35	#define RCU_STAT_SHIFT 26
	36	/* boot selection */
15753b65 JC	37	#define RCU_BOOT_SEL(x) ((x >> 18) & 0x7)
15753b65 JC	38	#define RCU_BOOT_SEL_XRX200(x) (((x >> 17) & 0xf) \| ((x >> 8) & 0x10))
8ec6d935	39
8ec6d935 JC	40	/* remapped base addr of the reset control unit */
8ec6d935 JC	41	static void __iomem *ltq_rcu_membase;
15753b65	42	static struct device_node *ltq_rcu_np;
8ec6d935 JC	43
	44	/* This function is used by the watchdog driver */
	45	int ltq_reset_cause(void)
	46	{
6697c693 JC	47	u32 val = ltq_rcu_r32(RCU_RST_STAT);
6697c693 JC	48	return val >> RCU_STAT_SHIFT;
8ec6d935 JC	49	}
	50	EXPORT_SYMBOL_GPL(ltq_reset_cause);
	51
6697c693 JC	52	/* allow platform code to find out what source we booted from */
	53	unsigned char ltq_boot_select(void)
	54	{
	55	u32 val = ltq_rcu_r32(RCU_RST_STAT);
15753b65 JC	56
	57	if (of_device_is_compatible(ltq_rcu_np, "lantiq,rcu-xrx200"))
	58	return RCU_BOOT_SEL_XRX200(val);
	59
	60	return RCU_BOOT_SEL(val);
6697c693 JC	61	}
	62
	63	/* reset a io domain for u micro seconds */
	64	void ltq_reset_once(unsigned int module, ulong u)
	65	{
	66	ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) \| module, RCU_RST_REQ);
	67	udelay(u);
	68	ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) & ~module, RCU_RST_REQ);
	69	}
	70
8ec6d935 JC	71	static void ltq_machine_restart(char *command)
8ec6d935 JC	72	{
8ec6d935	73	local_irq_disable();
6697c693	74	ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) \| RCU_RD_SRST, RCU_RST_REQ);
8ec6d935 JC	75	unreachable();
	76	}
	77
	78	static void ltq_machine_halt(void)
	79	{
8ec6d935 JC	80	local_irq_disable();
	81	unreachable();
	82	}
	83
	84	static void ltq_machine_power_off(void)
	85	{
8ec6d935 JC	86	local_irq_disable();
	87	unreachable();
	88	}
	89
	90	static int __init mips_reboot_setup(void)
	91	{
a0392222	92	struct resource res;
15753b65 JC	93
	94	ltq_rcu_np = of_find_compatible_node(NULL, NULL, "lantiq,rcu-xway");
	95	if (!ltq_rcu_np)
	96	ltq_rcu_np = of_find_compatible_node(NULL, NULL,
	97	"lantiq,rcu-xrx200");
a0392222 JC	98
a0392222 JC	99	/* check if all the reset register range is available */
15753b65	100	if (!ltq_rcu_np)
a0392222 JC	101	panic("Failed to load reset resources from devicetree");
a0392222 JC	102
15753b65	103	if (of_address_to_resource(ltq_rcu_np, 0, &res))
a0392222	104	panic("Failed to get rcu memory range");
8ec6d935	105
a0392222 JC	106	if (request_mem_region(res.start, resource_size(&res), res.name) < 0)
a0392222 JC	107	pr_err("Failed to request rcu memory");
8ec6d935	108
a0392222	109	ltq_rcu_membase = ioremap_nocache(res.start, resource_size(&res));
8ec6d935	110	if (!ltq_rcu_membase)
6697c693	111	panic("Failed to remap core memory");
8ec6d935 JC	112
	113	_machine_restart = ltq_machine_restart;
	114	_machine_halt = ltq_machine_halt;
	115	pm_power_off = ltq_machine_power_off;
	116
	117	return 0;
	118	}
	119
	120	arch_initcall(mips_reboot_setup);