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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
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 = sizeof(struct bcm6345_wdt_priv),
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.probe = bcm6345_wdt_probe,
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};
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