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/*
* Keystone2 based boards and SOC related code.
*
* Copyright 2013 Texas Instruments, Inc.
* Cyril Chemparathy <cyril@ti.com>
* Santosh Shilimkar <santosh.shillimkar@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <asm/setup.h>
#include <asm/mach/map.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/smp_plat.h>
#include "keystone.h"
#define PLL_RESET_WRITE_KEY_MASK 0xffff0000
#define PLL_RESET_WRITE_KEY 0x5a69
#define PLL_RESET BIT(16)
static void __iomem *keystone_rstctrl;
static void __init keystone_init(void)
{
struct device_node *node;
node = of_find_compatible_node(NULL, NULL, "ti,keystone-reset");
if (WARN_ON(!node))
pr_warn("ti,keystone-reset node undefined\n");
keystone_rstctrl = of_iomap(node, 0);
if (WARN_ON(!keystone_rstctrl))
pr_warn("ti,keystone-reset iomap error\n");
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
}
static const char *keystone_match[] __initconst = {
"ti,keystone-evm",
NULL,
};
void keystone_restart(char mode, const char *cmd)
{
u32 val;
BUG_ON(!keystone_rstctrl);
/* Enable write access to RSTCTRL */
val = readl(keystone_rstctrl);
val &= PLL_RESET_WRITE_KEY_MASK;
val |= PLL_RESET_WRITE_KEY;
writel(val, keystone_rstctrl);
/* Reset the SOC */
val = readl(keystone_rstctrl);
val &= ~PLL_RESET;
writel(val, keystone_rstctrl);
}
DT_MACHINE_START(KEYSTONE, "Keystone")
.smp = smp_ops(keystone_smp_ops),
.init_machine = keystone_init,
.dt_compat = keystone_match,
.restart = keystone_restart,
MACHINE_END
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