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118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
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*
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* Derived from linux/drivers/watchdog/bcm63xx_wdt.c:
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* Copyright (C) 2007 Miguel Gaio <miguel.gaio@efixo.com>
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* Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <wdt.h>
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#include <clk.h>
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#include <asm/io.h>
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/* WDT Value register */
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#define WDT_VAL_REG 0x0
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#define WDT_VAL_MIN 0x00000002
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#define WDT_VAL_MAX 0xfffffffe
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/* WDT Control register */
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#define WDT_CTL_REG 0x4
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#define WDT_CTL_START1_MASK 0x0000ff00
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#define WDT_CTL_START2_MASK 0x000000ff
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#define WDT_CTL_STOP1_MASK 0x0000ee00
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#define WDT_CTL_STOP2_MASK 0x000000ee
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struct bcm6345_wdt_priv {
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void __iomem *regs;
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unsigned long clk_rate;
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};
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static int bcm6345_wdt_reset(struct udevice *dev)
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{
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struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
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writel(WDT_CTL_START1_MASK, priv->regs + WDT_CTL_REG);
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writel(WDT_CTL_START2_MASK, priv->regs + WDT_CTL_REG);
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return 0;
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}
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static int bcm6345_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
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{
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struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
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u32 val = priv->clk_rate / 1000 * timeout;
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if (val < WDT_VAL_MIN) {
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debug("watchdog won't fire with less than 2 ticks\n");
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val = WDT_VAL_MIN;
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} else if (val > WDT_VAL_MAX) {
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debug("maximum watchdog timeout exceeded\n");
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val = WDT_VAL_MAX;
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}
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writel(val, priv->regs + WDT_VAL_REG);
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return bcm6345_wdt_reset(dev);
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}
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static int bcm6345_wdt_expire_now(struct udevice *dev, ulong flags)
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{
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return bcm6345_wdt_start(dev, WDT_VAL_MIN, flags);
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}
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static int bcm6345_wdt_stop(struct udevice *dev)
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{
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struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
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writel(WDT_CTL_STOP1_MASK, priv->regs + WDT_CTL_REG);
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writel(WDT_CTL_STOP2_MASK, priv->regs + WDT_CTL_REG);
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return 0;
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}
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static const struct wdt_ops bcm6345_wdt_ops = {
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.expire_now = bcm6345_wdt_expire_now,
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.reset = bcm6345_wdt_reset,
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.start = bcm6345_wdt_start,
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.stop = bcm6345_wdt_stop,
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};
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static const struct udevice_id bcm6345_wdt_ids[] = {
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{ .compatible = "brcm,bcm6345-wdt" },
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{ /* sentinel */ }
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};
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static int bcm6345_wdt_probe(struct udevice *dev)
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{
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struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
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struct clk clk;
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int ret;
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priv->regs = dev_remap_addr(dev);
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if (!priv->regs)
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return -EINVAL;
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ret = clk_get_by_index(dev, 0, &clk);
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if (!ret)
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priv->clk_rate = clk_get_rate(&clk);
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else
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return -EINVAL;
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bcm6345_wdt_stop(dev);
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return 0;
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}
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U_BOOT_DRIVER(wdt_bcm6345) = {
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.name = "wdt_bcm6345",
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.id = UCLASS_WDT,
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.of_match = bcm6345_wdt_ids,
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.ops = &bcm6345_wdt_ops,
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.priv_auto_alloc_size = sizeof(struct bcm6345_wdt_priv),
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.probe = bcm6345_wdt_probe,
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};
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