LXR linux/arch/arm/mach-bcm/board

   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
  29static 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        of_node_put(np_wdog);
  42        if (!base) {
  43                pr_emerg("Couldn't map brcm,kona-wdt\n");
  44                return;
  45        }
  46
  47        /* Enable watchdog with short timeout (244us). */
  48        val = readl(base + SECWDOG_OFFSET);
  49        val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK;
  50        val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK |
  51                (0x15 << SECWDOG_CLKS_SHIFT) |
  52                (0x8 << SECWDOG_COUNT_SHIFT);
  53        writel(val, base + SECWDOG_OFFSET);
  54
  55        /* Wait for reset */
  56        while (1);
  57}
  58
  59static void __init bcm281xx_init(void)
  60{
  61        kona_l2_cache_init();
  62}
  63
  64static const char * const bcm281xx_dt_compat[] = {
  65        "brcm,bcm11351",        /* Have to use the first number upstreamed */
  66        NULL,
  67};
  68
  69DT_MACHINE_START(BCM281XX_DT, "BCM281xx Broadcom Application Processor")
  70        .init_machine = bcm281xx_init,
  71        .restart = bcm281xx_restart,
  72        .dt_compat = bcm281xx_dt_compat,
  73MACHINE_END
  74