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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 905e779b9e0bd29255ebc6244f017690fdc10fc4 / . / drivers / watchdog / ast2600_wdt.c
blob: bc9842089bea031d996ff68823a8f4e32b069688 [file] [log] [blame]
Chia-Wei, Wang337d95c2020-12-14 13:54:25 +0800[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (c) 2020 Aspeed Technology, Inc
4 */
5
6#include <common.h>
7#include <dm.h>
8#include <errno.h>
9#include <log.h>
10#include <wdt.h>
11#include <asm/io.h>
12#include <asm/arch/wdt_ast2600.h>
13#include <linux/err.h>
14
15struct ast2600_wdt_priv {
16 struct ast2600_wdt *regs;
17};
18
19static int ast2600_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
20{
21 struct ast2600_wdt_priv *priv = dev_get_priv(dev);
22 struct ast2600_wdt *wdt = priv->regs;
23
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);
28
29 return 0;
30}
31
32static int ast2600_wdt_stop(struct udevice *dev)
33{
34 struct ast2600_wdt_priv *priv = dev_get_priv(dev);
35 struct ast2600_wdt *wdt = priv->regs;
36
37 clrbits_le32(&wdt->ctrl, WDT_CTRL_EN);
38
39 writel(WDT_RESET_MASK1_DEFAULT, &wdt->reset_mask1);
40 writel(WDT_RESET_MASK2_DEFAULT, &wdt->reset_mask2);
41
42 return 0;
43}
44
45static int ast2600_wdt_reset(struct udevice *dev)
46{
47 struct ast2600_wdt_priv *priv = dev_get_priv(dev);
48 struct ast2600_wdt *wdt = priv->regs;
49
50 writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
51
52 return 0;
53}
54
55static int ast2600_wdt_expire_now(struct udevice *dev, ulong flags)
56{
57 int ret;
58 struct ast2600_wdt_priv *priv = dev_get_priv(dev);
59 struct ast2600_wdt *wdt = priv->regs;
60
61 ret = ast2600_wdt_start(dev, 1, flags);
62 if (ret)
63 return ret;
64
65 while (readl(&wdt->ctrl) & WDT_CTRL_EN)
66 ;
67
68 return ast2600_wdt_stop(dev);
69}
70
71static int ast2600_wdt_of_to_plat(struct udevice *dev)
72{
73 struct ast2600_wdt_priv *priv = dev_get_priv(dev);
74
75 priv->regs = dev_read_addr_ptr(dev);
76 if (!priv->regs)
77 return -EINVAL;
78
79 return 0;
80}
81
82static 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,
87};
88
89static const struct udevice_id ast2600_wdt_ids[] = {
90 { .compatible = "aspeed,ast2600-wdt" },
91 { }
92};
93
94static int ast2600_wdt_probe(struct udevice *dev)
95{
96 debug("%s() wdt%u\n", __func__, dev_seq(dev));
97 ast2600_wdt_stop(dev);
98
99 return 0;
100}
101
102U_BOOT_DRIVER(ast2600_wdt) = {
103 .name = "ast2600_wdt",
104 .id = UCLASS_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,
110};