2 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
4 * Derived from linux/drivers/watchdog/bcm63xx_wdt.c:
5 * Copyright (C) 2007 Miguel Gaio <miguel.gaio@efixo.com>
6 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
8 * SPDX-License-Identifier: GPL-2.0+
16 /* WDT Value register */
17 #define WDT_VAL_REG 0x0
18 #define WDT_VAL_MIN 0x00000002
19 #define WDT_VAL_MAX 0xfffffffe
21 /* WDT Control register */
22 #define WDT_CTL_REG 0x4
23 #define WDT_CTL_START1_MASK 0x0000ff00
24 #define WDT_CTL_START2_MASK 0x000000ff
25 #define WDT_CTL_STOP1_MASK 0x0000ee00
26 #define WDT_CTL_STOP2_MASK 0x000000ee
28 struct bcm6345_wdt_priv {
32 static int bcm6345_wdt_reset(struct udevice *dev)
34 struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
36 writel_be(WDT_CTL_START1_MASK, priv->regs + WDT_CTL_REG);
37 writel_be(WDT_CTL_START2_MASK, priv->regs + WDT_CTL_REG);
42 static int bcm6345_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
44 struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
46 if (timeout < WDT_VAL_MIN) {
47 debug("watchdog won't fire with less than 2 ticks\n");
48 timeout = WDT_VAL_MIN;
49 } else if (timeout > WDT_VAL_MAX) {
50 debug("maximum watchdog timeout exceeded\n");
51 timeout = WDT_VAL_MAX;
54 writel_be(timeout, priv->regs + WDT_VAL_REG);
56 return bcm6345_wdt_reset(dev);
59 static int bcm6345_wdt_expire_now(struct udevice *dev, ulong flags)
61 return bcm6345_wdt_start(dev, WDT_VAL_MIN, flags);
64 static int bcm6345_wdt_stop(struct udevice *dev)
66 struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
68 writel_be(WDT_CTL_STOP1_MASK, priv->regs + WDT_CTL_REG);
69 writel_be(WDT_CTL_STOP2_MASK, priv->regs + WDT_CTL_REG);
74 static const struct wdt_ops bcm6345_wdt_ops = {
75 .expire_now = bcm6345_wdt_expire_now,
76 .reset = bcm6345_wdt_reset,
77 .start = bcm6345_wdt_start,
78 .stop = bcm6345_wdt_stop,
81 static const struct udevice_id bcm6345_wdt_ids[] = {
82 { .compatible = "brcm,bcm6345-wdt" },
86 static int bcm6345_wdt_probe(struct udevice *dev)
88 struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
92 addr = devfdt_get_addr_size_index(dev, 0, &size);
93 if (addr == FDT_ADDR_T_NONE)
96 priv->regs = ioremap(addr, size);
98 bcm6345_wdt_stop(dev);
103 U_BOOT_DRIVER(wdt_bcm6345) = {
104 .name = "wdt_bcm6345",
106 .of_match = bcm6345_wdt_ids,
107 .ops = &bcm6345_wdt_ops,
108 .priv_auto_alloc_size = sizeof(struct bcm6345_wdt_priv),
109 .probe = bcm6345_wdt_probe,