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 
19 static 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 
49 static void __init bcm281xx_init(void)
50 {
51 	kona_l2_cache_init();
52 }
53 
54 static const char * const bcm281xx_dt_compat[] = {
55 	"brcm,bcm11351",	/* Have to use the first number upstreamed */
56 	NULL,
57 };
58 
59 DT_MACHINE_START(BCM281XX_DT, "BCM281xx Broadcom Application Processor")
60 	.init_machine = bcm281xx_init,
61 	.restart = bcm281xx_restart,
62 	.dt_compat = bcm281xx_dt_compat,
63 MACHINE_END
64