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, compat: "brcm,kona-wdt");
26 if (!np_wdog) {
27 pr_emerg("Couldn't find brcm,kona-wdt\n");
28 return;
29 }
30 base = of_iomap(node: np_wdog, index: 0);
31 of_node_put(node: 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(addr: 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, addr: 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

source code of linux/arch/arm/mach-bcm/board_bcm281xx.c