2 * Copyright (C) 2014 Broadcom Corporation
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation version 2.
8 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
9 * kind, whether express or implied; without even the implied warranty
10 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <linux/clocksource.h>
15 #include <linux/of_address.h>
16 #include <linux/of_platform.h>
18 #include <asm/mach/arch.h>
20 #include "bcm_kona_smc.h"
23 #define RSTMGR_DT_STRING "brcm,bcm21664-resetmgr"
25 #define RSTMGR_REG_WR_ACCESS_OFFSET 0
26 #define RSTMGR_REG_CHIP_SOFT_RST_OFFSET 4
28 #define RSTMGR_WR_PASSWORD 0xa5a5
29 #define RSTMGR_WR_PASSWORD_SHIFT 8
30 #define RSTMGR_WR_ACCESS_ENABLE 1
32 static void bcm21664_restart(enum reboot_mode mode, const char *cmd)
35 struct device_node *resetmgr;
37 resetmgr = of_find_compatible_node(NULL, NULL, RSTMGR_DT_STRING);
39 pr_emerg("Couldn't find " RSTMGR_DT_STRING "\n");
42 base = of_iomap(resetmgr, 0);
44 pr_emerg("Couldn't map " RSTMGR_DT_STRING "\n");
49 * A soft reset is triggered by writing a 0 to bit 0 of the soft reset
50 * register. To write to that register we must first write the password
51 * and the enable bit in the write access enable register.
53 writel((RSTMGR_WR_PASSWORD << RSTMGR_WR_PASSWORD_SHIFT) |
54 RSTMGR_WR_ACCESS_ENABLE,
55 base + RSTMGR_REG_WR_ACCESS_OFFSET);
56 writel(0, base + RSTMGR_REG_CHIP_SOFT_RST_OFFSET);
62 static void __init bcm21664_init(void)
64 of_platform_populate(NULL, of_default_bus_match_table, NULL,
69 static const char * const bcm21664_dt_compat[] = {
74 DT_MACHINE_START(BCM21664_DT, "BCM21664 Broadcom Application Processor")
75 .init_machine = bcm21664_init,
76 .restart = bcm21664_restart,
77 .dt_compat = bcm21664_dt_compat,