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/*
* Copyright (C) 2014 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/of_address.h>
#include <linux/of_platform.h>
#include <linux/io.h>
#include <asm/mach/arch.h>
#include "kona.h"
#define RSTMGR_DT_STRING "brcm,bcm21664-resetmgr"
#define RSTMGR_REG_WR_ACCESS_OFFSET 0
#define RSTMGR_REG_CHIP_SOFT_RST_OFFSET 4
#define RSTMGR_WR_PASSWORD 0xa5a5
#define RSTMGR_WR_PASSWORD_SHIFT 8
#define RSTMGR_WR_ACCESS_ENABLE 1
static void bcm21664_restart(enum reboot_mode mode, const char *cmd)
{
void __iomem *base;
struct device_node *resetmgr;
resetmgr = of_find_compatible_node(NULL, NULL, RSTMGR_DT_STRING);
if (!resetmgr) {
pr_emerg("Couldn't find " RSTMGR_DT_STRING "\n");
return;
}
base = of_iomap(resetmgr, 0);
if (!base) {
pr_emerg("Couldn't map " RSTMGR_DT_STRING "\n");
return;
}
/*
* A soft reset is triggered by writing a 0 to bit 0 of the soft reset
* register. To write to that register we must first write the password
* and the enable bit in the write access enable register.
*/
writel((RSTMGR_WR_PASSWORD << RSTMGR_WR_PASSWORD_SHIFT) |
RSTMGR_WR_ACCESS_ENABLE,
base + RSTMGR_REG_WR_ACCESS_OFFSET);
writel(0, base + RSTMGR_REG_CHIP_SOFT_RST_OFFSET);
/* Wait for reset */
while (1);
}
static void __init bcm21664_init(void)
{
of_platform_populate(NULL, of_default_bus_match_table, NULL,
&platform_bus);
kona_l2_cache_init();
}
static const char * const bcm21664_dt_compat[] = {
"brcm,bcm21664",
NULL,
};
DT_MACHINE_START(BCM21664_DT, "BCM21664 Broadcom Application Processor")
.init_machine = bcm21664_init,
.restart = bcm21664_restart,
.dt_compat = bcm21664_dt_compat,
MACHINE_END
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