83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
110 lines
2.5 KiB
C
110 lines
2.5 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 <wdt.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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};
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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_be(WDT_CTL_START1_MASK, priv->regs + WDT_CTL_REG);
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writel_be(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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if (timeout < WDT_VAL_MIN) {
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debug("watchdog won't fire with less than 2 ticks\n");
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timeout = WDT_VAL_MIN;
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} else if (timeout > WDT_VAL_MAX) {
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debug("maximum watchdog timeout exceeded\n");
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timeout = WDT_VAL_MAX;
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}
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writel_be(timeout, 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_be(WDT_CTL_STOP1_MASK, priv->regs + WDT_CTL_REG);
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writel_be(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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fdt_addr_t addr;
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fdt_size_t size;
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addr = devfdt_get_addr_size_index(dev, 0, &size);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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priv->regs = ioremap(addr, size);
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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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