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
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