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git01.mediatek.com / filogic / uboot / f46fb184fdf22cf79096c355ad6c444e969c49c4 / . / drivers / watchdog / bcm6345_wdt.c
blob: 3ef7d438a6aef56fb2b51f02a6491091341d557c [file] [log] [blame]
Álvaro Fernández Rojasd8759a52017-05-16 18:29:09 +0200[diff] [blame]1/*
2 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
3 *
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>
7 *
8 * SPDX-License-Identifier: GPL-2.0+
9 */
10
11#include <common.h>
12#include <dm.h>
13#include <wdt.h>
14#include <asm/io.h>
15
16/* WDT Value register */
17#define WDT_VAL_REG 0x0
18#define WDT_VAL_MIN 0x00000002
19#define WDT_VAL_MAX 0xfffffffe
20
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
27
28struct bcm6345_wdt_priv {
29 void __iomem *regs;
30};
31
32static int bcm6345_wdt_reset(struct udevice *dev)
33{
34 struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
35
36 writel_be(WDT_CTL_START1_MASK, priv->regs + WDT_CTL_REG);
37 writel_be(WDT_CTL_START2_MASK, priv->regs + WDT_CTL_REG);
38
39 return 0;
40}
41
42static int bcm6345_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
43{
44 struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
45
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;
52 }
53
54 writel_be(timeout, priv->regs + WDT_VAL_REG);
55
56 return bcm6345_wdt_reset(dev);
57}
58
59static int bcm6345_wdt_expire_now(struct udevice *dev, ulong flags)
60{
61 return bcm6345_wdt_start(dev, WDT_VAL_MIN, flags);
62}
63
64static int bcm6345_wdt_stop(struct udevice *dev)
65{
66 struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
67
68 writel_be(WDT_CTL_STOP1_MASK, priv->regs + WDT_CTL_REG);
69 writel_be(WDT_CTL_STOP2_MASK, priv->regs + WDT_CTL_REG);
70
71 return 0;
72}
73
74static 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,
79};
80
81static const struct udevice_id bcm6345_wdt_ids[] = {
82 { .compatible = "brcm,bcm6345-wdt" },
83 { /* sentinel */ }
84};
85
86static int bcm6345_wdt_probe(struct udevice *dev)
87{
88 struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
89 fdt_addr_t addr;
90 fdt_size_t size;
91
Simon Glassba1dea42017-05-17 17:18:05 -0600[diff] [blame]92 addr = devfdt_get_addr_size_index(dev, 0, &size);
Álvaro Fernández Rojasd8759a52017-05-16 18:29:09 +0200[diff] [blame]93 if (addr == FDT_ADDR_T_NONE)
94 return -EINVAL;
95
96 priv->regs = ioremap(addr, size);
97
98 bcm6345_wdt_stop(dev);
99
100 return 0;
101}
102
103U_BOOT_DRIVER(wdt_bcm6345) = {
104 .name = "wdt_bcm6345",
105 .id = UCLASS_WDT,
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,
110};