1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2020 Aspeed Technology, Inc
12 #include <asm/arch/wdt_ast2600.h>
13 #include <linux/err.h>
15 struct ast2600_wdt_priv {
16 struct ast2600_wdt *regs;
19 static int ast2600_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
21 struct ast2600_wdt_priv *priv = dev_get_priv(dev);
22 struct ast2600_wdt *wdt = priv->regs;
24 /* WDT counts in the 1MHz frequency, namely 1us */
25 writel((u32)(timeout_ms * 1000), &wdt->counter_reload_val);
26 writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
27 writel(WDT_CTRL_EN | WDT_CTRL_RESET, &wdt->ctrl);
32 static int ast2600_wdt_stop(struct udevice *dev)
34 struct ast2600_wdt_priv *priv = dev_get_priv(dev);
35 struct ast2600_wdt *wdt = priv->regs;
37 clrbits_le32(&wdt->ctrl, WDT_CTRL_EN);
39 writel(WDT_RESET_MASK1_DEFAULT, &wdt->reset_mask1);
40 writel(WDT_RESET_MASK2_DEFAULT, &wdt->reset_mask2);
45 static int ast2600_wdt_reset(struct udevice *dev)
47 struct ast2600_wdt_priv *priv = dev_get_priv(dev);
48 struct ast2600_wdt *wdt = priv->regs;
50 writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
55 static int ast2600_wdt_expire_now(struct udevice *dev, ulong flags)
58 struct ast2600_wdt_priv *priv = dev_get_priv(dev);
59 struct ast2600_wdt *wdt = priv->regs;
61 ret = ast2600_wdt_start(dev, 1, flags);
65 while (readl(&wdt->ctrl) & WDT_CTRL_EN)
68 return ast2600_wdt_stop(dev);
71 static int ast2600_wdt_of_to_plat(struct udevice *dev)
73 struct ast2600_wdt_priv *priv = dev_get_priv(dev);
75 priv->regs = dev_read_addr_ptr(dev);
82 static const struct wdt_ops ast2600_wdt_ops = {
83 .start = ast2600_wdt_start,
84 .reset = ast2600_wdt_reset,
85 .stop = ast2600_wdt_stop,
86 .expire_now = ast2600_wdt_expire_now,
89 static const struct udevice_id ast2600_wdt_ids[] = {
90 { .compatible = "aspeed,ast2600-wdt" },
94 static int ast2600_wdt_probe(struct udevice *dev)
96 debug("%s() wdt%u\n", __func__, dev_seq(dev));
97 ast2600_wdt_stop(dev);
102 U_BOOT_DRIVER(ast2600_wdt) = {
103 .name = "ast2600_wdt",
105 .of_match = ast2600_wdt_ids,
106 .probe = ast2600_wdt_probe,
107 .priv_auto = sizeof(struct ast2600_wdt_priv),
108 .of_to_plat = ast2600_wdt_of_to_plat,
109 .ops = &ast2600_wdt_ops,