1/*
2 * Copyright (C) 2012-2014 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
14#include <linux/clocksource.h>
15#include <linux/of_address.h>
16#include <linux/of_platform.h>
17
18#include <asm/mach/arch.h>
19
20#include "kona_l2_cache.h"
21
22#define SECWDOG_OFFSET			0x00000000
23#define SECWDOG_RESERVED_MASK		0xe2000000
24#define SECWDOG_WD_LOAD_FLAG_MASK	0x10000000
25#define SECWDOG_EN_MASK			0x08000000
26#define SECWDOG_SRSTEN_MASK		0x04000000
27#define SECWDOG_CLKS_SHIFT		20
28#define SECWDOG_COUNT_SHIFT		0
29
30static void bcm281xx_restart(enum reboot_mode mode, const char *cmd)
31{
32	uint32_t val;
33	void __iomem *base;
34	struct device_node *np_wdog;
35
36	np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt");
37	if (!np_wdog) {
38		pr_emerg("Couldn't find brcm,kona-wdt\n");
39		return;
40	}
41	base = of_iomap(np_wdog, 0);
42	if (!base) {
43		pr_emerg("Couldn't map brcm,kona-wdt\n");
44		return;
45	}
46
47	/* Enable watchdog with short timeout (244us). */
48	val = readl(base + SECWDOG_OFFSET);
49	val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK;
50	val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK |
51		(0x15 << SECWDOG_CLKS_SHIFT) |
52		(0x8 << SECWDOG_COUNT_SHIFT);
53	writel(val, base + SECWDOG_OFFSET);
54
55	/* Wait for reset */
56	while (1);
57}
58
59static void __init bcm281xx_init(void)
60{
61	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
62	kona_l2_cache_init();
63}
64
65static const char * const bcm281xx_dt_compat[] = {
66	"brcm,bcm11351",	/* Have to use the first number upstreamed */
67	NULL,
68};
69
70DT_MACHINE_START(BCM281XX_DT, "BCM281xx Broadcom Application Processor")
71	.init_machine = bcm281xx_init,
72	.restart = bcm281xx_restart,
73	.dt_compat = bcm281xx_dt_compat,
74MACHINE_END
75