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
17#include <asm/mach/arch.h>
18
19#include "kona_l2_cache.h"
20
21#define SECWDOG_OFFSET			0x00000000
22#define SECWDOG_RESERVED_MASK		0xe2000000
23#define SECWDOG_WD_LOAD_FLAG_MASK	0x10000000
24#define SECWDOG_EN_MASK			0x08000000
25#define SECWDOG_SRSTEN_MASK		0x04000000
26#define SECWDOG_CLKS_SHIFT		20
27#define SECWDOG_COUNT_SHIFT		0
28
29static void bcm281xx_restart(enum reboot_mode mode, const char *cmd)
30{
31	uint32_t val;
32	void __iomem *base;
33	struct device_node *np_wdog;
34
35	np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt");
36	if (!np_wdog) {
37		pr_emerg("Couldn't find brcm,kona-wdt\n");
38		return;
39	}
40	base = of_iomap(np_wdog, 0);
41	of_node_put(np_wdog);
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	kona_l2_cache_init();
62}
63
64static const char * const bcm281xx_dt_compat[] = {
65	"brcm,bcm11351",	/* Have to use the first number upstreamed */
66	NULL,
67};
68
69DT_MACHINE_START(BCM281XX_DT, "BCM281xx Broadcom Application Processor")
70	.init_machine = bcm281xx_init,
71	.restart = bcm281xx_restart,
72	.dt_compat = bcm281xx_dt_compat,
73MACHINE_END
74