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