77 строки
2.0 KiB
C
77 строки
2.0 KiB
C
/*
|
|
* 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_l2_cache.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, NULL);
|
|
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
|