1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2012-2014 Broadcom Corporation
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * This program is free software; you can redistribute it and/or
5*4882a593Smuzhiyun * modify it under the terms of the GNU General Public License as
6*4882a593Smuzhiyun * published by the Free Software Foundation version 2.
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * This program is distributed "as is" WITHOUT ANY WARRANTY of any
9*4882a593Smuzhiyun * kind, whether express or implied; without even the implied warranty
10*4882a593Smuzhiyun * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11*4882a593Smuzhiyun * GNU General Public License for more details.
12*4882a593Smuzhiyun */
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <linux/clocksource.h>
15*4882a593Smuzhiyun #include <linux/of_address.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include <asm/mach/arch.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include "kona_l2_cache.h"
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #define SECWDOG_OFFSET 0x00000000
22*4882a593Smuzhiyun #define SECWDOG_RESERVED_MASK 0xe2000000
23*4882a593Smuzhiyun #define SECWDOG_WD_LOAD_FLAG_MASK 0x10000000
24*4882a593Smuzhiyun #define SECWDOG_EN_MASK 0x08000000
25*4882a593Smuzhiyun #define SECWDOG_SRSTEN_MASK 0x04000000
26*4882a593Smuzhiyun #define SECWDOG_CLKS_SHIFT 20
27*4882a593Smuzhiyun #define SECWDOG_COUNT_SHIFT 0
28*4882a593Smuzhiyun
bcm281xx_restart(enum reboot_mode mode,const char * cmd)29*4882a593Smuzhiyun static void bcm281xx_restart(enum reboot_mode mode, const char *cmd)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun uint32_t val;
32*4882a593Smuzhiyun void __iomem *base;
33*4882a593Smuzhiyun struct device_node *np_wdog;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt");
36*4882a593Smuzhiyun if (!np_wdog) {
37*4882a593Smuzhiyun pr_emerg("Couldn't find brcm,kona-wdt\n");
38*4882a593Smuzhiyun return;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun base = of_iomap(np_wdog, 0);
41*4882a593Smuzhiyun of_node_put(np_wdog);
42*4882a593Smuzhiyun if (!base) {
43*4882a593Smuzhiyun pr_emerg("Couldn't map brcm,kona-wdt\n");
44*4882a593Smuzhiyun return;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /* Enable watchdog with short timeout (244us). */
48*4882a593Smuzhiyun val = readl(base + SECWDOG_OFFSET);
49*4882a593Smuzhiyun val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK;
50*4882a593Smuzhiyun val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK |
51*4882a593Smuzhiyun (0x15 << SECWDOG_CLKS_SHIFT) |
52*4882a593Smuzhiyun (0x8 << SECWDOG_COUNT_SHIFT);
53*4882a593Smuzhiyun writel(val, base + SECWDOG_OFFSET);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun /* Wait for reset */
56*4882a593Smuzhiyun while (1);
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
bcm281xx_init(void)59*4882a593Smuzhiyun static void __init bcm281xx_init(void)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun kona_l2_cache_init();
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun static const char * const bcm281xx_dt_compat[] = {
65*4882a593Smuzhiyun "brcm,bcm11351", /* Have to use the first number upstreamed */
66*4882a593Smuzhiyun NULL,
67*4882a593Smuzhiyun };
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun DT_MACHINE_START(BCM281XX_DT, "BCM281xx Broadcom Application Processor")
70*4882a593Smuzhiyun .init_machine = bcm281xx_init,
71*4882a593Smuzhiyun .restart = bcm281xx_restart,
72*4882a593Smuzhiyun .dt_compat = bcm281xx_dt_compat,
73*4882a593Smuzhiyun MACHINE_END
74