86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/*
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* Allwinner A31 SoCs reset code
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*
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* Copyright (C) 2012-2014 Maxime Ripard
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*
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <asm/system_misc.h>
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#define SUN6I_WATCHDOG1_IRQ_REG 0x00
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#define SUN6I_WATCHDOG1_CTRL_REG 0x10
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#define SUN6I_WATCHDOG1_CTRL_RESTART BIT(0)
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#define SUN6I_WATCHDOG1_CONFIG_REG 0x14
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#define SUN6I_WATCHDOG1_CONFIG_RESTART BIT(0)
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#define SUN6I_WATCHDOG1_CONFIG_IRQ BIT(1)
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#define SUN6I_WATCHDOG1_MODE_REG 0x18
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#define SUN6I_WATCHDOG1_MODE_ENABLE BIT(0)
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static void __iomem *wdt_base;
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static void sun6i_wdt_restart(enum reboot_mode mode, const char *cmd)
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{
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if (!wdt_base)
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return;
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/* Disable interrupts */
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writel(0, wdt_base + SUN6I_WATCHDOG1_IRQ_REG);
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/* We want to disable the IRQ and just reset the whole system */
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writel(SUN6I_WATCHDOG1_CONFIG_RESTART,
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wdt_base + SUN6I_WATCHDOG1_CONFIG_REG);
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/* Enable timer. The default and lowest interval value is 0.5s */
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writel(SUN6I_WATCHDOG1_MODE_ENABLE,
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wdt_base + SUN6I_WATCHDOG1_MODE_REG);
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/* Restart the watchdog. */
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writel(SUN6I_WATCHDOG1_CTRL_RESTART,
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wdt_base + SUN6I_WATCHDOG1_CTRL_REG);
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while (1) {
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mdelay(5);
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writel(SUN6I_WATCHDOG1_MODE_ENABLE,
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wdt_base + SUN6I_WATCHDOG1_MODE_REG);
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}
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}
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static int sun6i_reboot_probe(struct platform_device *pdev)
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{
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wdt_base = of_iomap(pdev->dev.of_node, 0);
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if (!wdt_base) {
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WARN(1, "failed to map watchdog base address");
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return -ENODEV;
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}
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arm_pm_restart = sun6i_wdt_restart;
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return 0;
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}
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static struct of_device_id sun6i_reboot_of_match[] = {
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{ .compatible = "allwinner,sun6i-a31-wdt" },
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{}
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};
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static struct platform_driver sun6i_reboot_driver = {
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.probe = sun6i_reboot_probe,
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.driver = {
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.name = "sun6i-reboot",
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.of_match_table = sun6i_reboot_of_match,
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},
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};
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module_platform_driver(sun6i_reboot_driver);
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