66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
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/*
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* Copyright (C) 2013 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/of_address.h>
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#include <asm/io.h>
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#include "kona.h"
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static void __iomem *watchdog_base;
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void bcm_kona_setup_restart(void)
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{
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struct device_node *np_wdog;
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/*
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* The assumption is that whoever calls bcm_kona_setup_restart()
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* also needs a Kona Watchdog Timer entry in Device Tree, i.e. we
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* report an error if the DT entry is missing.
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*/
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np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt");
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if (!np_wdog) {
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pr_err("brcm,kona-wdt not found in DT, reboot disabled\n");
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return;
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}
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watchdog_base = of_iomap(np_wdog, 0);
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WARN(!watchdog_base, "failed to map watchdog base");
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of_node_put(np_wdog);
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}
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#define SECWDOG_OFFSET 0x00000000
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#define SECWDOG_RESERVED_MASK 0xE2000000
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#define SECWDOG_WD_LOAD_FLAG_MASK 0x10000000
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#define SECWDOG_EN_MASK 0x08000000
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#define SECWDOG_SRSTEN_MASK 0x04000000
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#define SECWDOG_CLKS_SHIFT 20
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#define SECWDOG_LOCK_SHIFT 0
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void bcm_kona_restart(enum reboot_mode mode, const char *cmd)
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{
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uint32_t val;
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if (!watchdog_base)
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panic("Watchdog not mapped. Reboot failed.\n");
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/* Enable watchdog2 with very short timeout. */
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val = readl(watchdog_base + SECWDOG_OFFSET);
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val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK;
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val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK |
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(0x8 << SECWDOG_CLKS_SHIFT) |
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(0x8 << SECWDOG_LOCK_SHIFT);
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writel(val, watchdog_base + SECWDOG_OFFSET);
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while (1)
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;
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}
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