2 * Copyright 2017 Google, Inc
4 * SPDX-License-Identifier: GPL-2.0+
12 #include <asm/arch/wdt.h>
14 #define WDT_AST2500 2500
15 #define WDT_AST2400 2400
17 DECLARE_GLOBAL_DATA_PTR;
23 static int ast_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
25 struct ast_wdt_priv *priv = dev_get_priv(dev);
26 ulong driver_data = dev_get_driver_data(dev);
27 u32 reset_mode = ast_reset_mode_from_flags(flags);
29 clrsetbits_le32(&priv->regs->ctrl,
30 WDT_CTRL_RESET_MASK << WDT_CTRL_RESET_MODE_SHIFT,
31 reset_mode << WDT_CTRL_RESET_MODE_SHIFT);
33 if (driver_data >= WDT_AST2500 && reset_mode == WDT_CTRL_RESET_SOC)
34 writel(ast_reset_mask_from_flags(flags),
35 &priv->regs->reset_mask);
37 writel((u32) timeout, &priv->regs->counter_reload_val);
38 writel(WDT_COUNTER_RESTART_VAL, &priv->regs->counter_restart);
40 * Setting CLK1MHZ bit is just for compatibility with ast2400 part.
41 * On ast2500 watchdog timer clock is fixed at 1MHz and the bit is
44 setbits_le32(&priv->regs->ctrl,
45 WDT_CTRL_EN | WDT_CTRL_RESET | WDT_CTRL_CLK1MHZ);
50 static int ast_wdt_stop(struct udevice *dev)
52 struct ast_wdt_priv *priv = dev_get_priv(dev);
54 clrbits_le32(&priv->regs->ctrl, WDT_CTRL_EN);
59 static int ast_wdt_reset(struct udevice *dev)
61 struct ast_wdt_priv *priv = dev_get_priv(dev);
63 writel(WDT_COUNTER_RESTART_VAL, &priv->regs->counter_restart);
68 static int ast_wdt_expire_now(struct udevice *dev, ulong flags)
70 struct ast_wdt_priv *priv = dev_get_priv(dev);
73 ret = ast_wdt_start(dev, 1, flags);
77 while (readl(&priv->regs->ctrl) & WDT_CTRL_EN)
80 return ast_wdt_stop(dev);
83 static int ast_wdt_ofdata_to_platdata(struct udevice *dev)
85 struct ast_wdt_priv *priv = dev_get_priv(dev);
87 priv->regs = devfdt_get_addr_ptr(dev);
88 if (IS_ERR(priv->regs))
89 return PTR_ERR(priv->regs);
94 static const struct wdt_ops ast_wdt_ops = {
95 .start = ast_wdt_start,
96 .reset = ast_wdt_reset,
98 .expire_now = ast_wdt_expire_now,
101 static const struct udevice_id ast_wdt_ids[] = {
102 { .compatible = "aspeed,wdt", .data = WDT_AST2500 },
103 { .compatible = "aspeed,ast2500-wdt", .data = WDT_AST2500 },
104 { .compatible = "aspeed,ast2400-wdt", .data = WDT_AST2400 },
108 static int ast_wdt_probe(struct udevice *dev)
110 debug("%s() wdt%u\n", __func__, dev->seq);
116 U_BOOT_DRIVER(ast_wdt) = {
119 .of_match = ast_wdt_ids,
120 .probe = ast_wdt_probe,
121 .priv_auto_alloc_size = sizeof(struct ast_wdt_priv),
122 .ofdata_to_platdata = ast_wdt_ofdata_to_platdata,
124 .flags = DM_FLAG_PRE_RELOC,