1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright (C) 2012-2014 Broadcom Corporation
3
4#include <linux/clocksource.h>
5#include <linux/of_address.h>
6
7#include <asm/mach/arch.h>
8
9#include "kona_l2_cache.h"
10
11#define SECWDOG_OFFSET			0x00000000
12#define SECWDOG_RESERVED_MASK		0xe2000000
13#define SECWDOG_WD_LOAD_FLAG_MASK	0x10000000
14#define SECWDOG_EN_MASK			0x08000000
15#define SECWDOG_SRSTEN_MASK		0x04000000
16#define SECWDOG_CLKS_SHIFT		20
17#define SECWDOG_COUNT_SHIFT		0
18
19static void bcm281xx_restart(enum reboot_mode mode, const char *cmd)
20{
21	uint32_t val;
22	void __iomem *base;
23	struct device_node *np_wdog;
24
25	np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt");
26	if (!np_wdog) {
27		pr_emerg("Couldn't find brcm,kona-wdt\n");
28		return;
29	}
30	base = of_iomap(np_wdog, 0);
31	of_node_put(np_wdog);
32	if (!base) {
33		pr_emerg("Couldn't map brcm,kona-wdt\n");
34		return;
35	}
36
37	/* Enable watchdog with short timeout (244us). */
38	val = readl(base + SECWDOG_OFFSET);
39	val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK;
40	val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK |
41		(0x15 << SECWDOG_CLKS_SHIFT) |
42		(0x8 << SECWDOG_COUNT_SHIFT);
43	writel(val, base + SECWDOG_OFFSET);
44
45	/* Wait for reset */
46	while (1);
47}
48
49static void __init bcm281xx_init(void)
50{
51	kona_l2_cache_init();
52}
53
54static const char * const bcm281xx_dt_compat[] = {
55	"brcm,bcm11351",	/* Have to use the first number upstreamed */
56	NULL,
57};
58
59DT_MACHINE_START(BCM281XX_DT, "BCM281xx Broadcom Application Processor")
60	.init_machine = bcm281xx_init,
61	.restart = bcm281xx_restart,
62	.dt_compat = bcm281xx_dt_compat,
63MACHINE_END
64