blob: 82ad5687771f8946754a19faf333f96ff97dad14 [file] [log] [blame]
Markus Mayerc3ceebd2014-03-06 17:18:13 +08001/*
2 * Copyright (C) 2014 Broadcom Corporation
3 *
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.
7 *
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.
12 */
13
Markus Mayerc3ceebd2014-03-06 17:18:13 +080014#include <linux/of_address.h>
15#include <linux/of_platform.h>
Alex Elderd5c627b2014-04-21 16:53:08 -050016#include <linux/io.h>
Markus Mayerc3ceebd2014-03-06 17:18:13 +080017
18#include <asm/mach/arch.h>
19
Alex Eldereeda4cb2014-04-21 16:53:11 -050020#include "kona_l2_cache.h"
Markus Mayerc3ceebd2014-03-06 17:18:13 +080021
22#define RSTMGR_DT_STRING "brcm,bcm21664-resetmgr"
23
24#define RSTMGR_REG_WR_ACCESS_OFFSET 0
25#define RSTMGR_REG_CHIP_SOFT_RST_OFFSET 4
26
27#define RSTMGR_WR_PASSWORD 0xa5a5
28#define RSTMGR_WR_PASSWORD_SHIFT 8
29#define RSTMGR_WR_ACCESS_ENABLE 1
30
31static void bcm21664_restart(enum reboot_mode mode, const char *cmd)
32{
33 void __iomem *base;
34 struct device_node *resetmgr;
35
36 resetmgr = of_find_compatible_node(NULL, NULL, RSTMGR_DT_STRING);
37 if (!resetmgr) {
38 pr_emerg("Couldn't find " RSTMGR_DT_STRING "\n");
39 return;
40 }
41 base = of_iomap(resetmgr, 0);
42 if (!base) {
43 pr_emerg("Couldn't map " RSTMGR_DT_STRING "\n");
44 return;
45 }
46
47 /*
48 * A soft reset is triggered by writing a 0 to bit 0 of the soft reset
49 * register. To write to that register we must first write the password
50 * and the enable bit in the write access enable register.
51 */
52 writel((RSTMGR_WR_PASSWORD << RSTMGR_WR_PASSWORD_SHIFT) |
53 RSTMGR_WR_ACCESS_ENABLE,
54 base + RSTMGR_REG_WR_ACCESS_OFFSET);
55 writel(0, base + RSTMGR_REG_CHIP_SOFT_RST_OFFSET);
56
57 /* Wait for reset */
58 while (1);
59}
60
61static void __init bcm21664_init(void)
62{
Pawel Molld2168142014-07-23 18:07:18 +010063 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
Markus Mayerc3ceebd2014-03-06 17:18:13 +080064 kona_l2_cache_init();
65}
66
67static const char * const bcm21664_dt_compat[] = {
68 "brcm,bcm21664",
69 NULL,
70};
71
72DT_MACHINE_START(BCM21664_DT, "BCM21664 Broadcom Application Processor")
73 .init_machine = bcm21664_init,
74 .restart = bcm21664_restart,
75 .dt_compat = bcm21664_dt_compat,
76MACHINE_END