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 
29 static 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 	if (!base) {
42 		pr_emerg("Couldn't map brcm,kona-wdt\n");
43 		return;
44 	}
45 
46 	/* Enable watchdog with short timeout (244us). */
47 	val = readl(base + SECWDOG_OFFSET);
48 	val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK;
49 	val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK |
50 		(0x15 << SECWDOG_CLKS_SHIFT) |
51 		(0x8 << SECWDOG_COUNT_SHIFT);
52 	writel(val, base + SECWDOG_OFFSET);
53 
54 	/* Wait for reset */
55 	while (1);
56 }
57 
58 static void __init bcm281xx_init(void)
59 {
60 	kona_l2_cache_init();
61 }
62 
63 static const char * const bcm281xx_dt_compat[] = {
64 	"brcm,bcm11351",	/* Have to use the first number upstreamed */
65 	NULL,
66 };
67 
68 DT_MACHINE_START(BCM281XX_DT, "BCM281xx Broadcom Application Processor")
69 	.init_machine = bcm281xx_init,
70 	.restart = bcm281xx_restart,
71 	.dt_compat = bcm281xx_dt_compat,
72 MACHINE_END
73