summaryrefslogtreecommitdiff
path: root/target/linux/ramips/patches-4.4/0049-watchdog-add-MT7621-support.patch
blob: 529a801dc54d2eecc8c898842ef20719c13fe234 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
From 77fe64de72317c0e090d82056e7a6a073f2972b4 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sun, 16 Mar 2014 05:24:42 +0000
Subject: [PATCH 49/53] watchdog: add MT7621 support

Signed-off-by: John Crispin <blogic@openwrt.org>
---
 drivers/watchdog/Kconfig      |    7 ++
 drivers/watchdog/Makefile     |    1 +
 drivers/watchdog/mt7621_wdt.c |  185 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 193 insertions(+)
 create mode 100644 drivers/watchdog/mt7621_wdt.c

--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1345,6 +1345,13 @@ config RALINK_WDT
 	help
 	  Hardware driver for the Ralink SoC Watchdog Timer.
 
+config MT7621_WDT
+	tristate "Mediatek SoC watchdog"
+	select WATCHDOG_CORE
+	depends on SOC_MT7620 || SOC_MT7621
+	help
+	  Hardware driver for the Ralink SoC Watchdog Timer.
+
 # PARISC Architecture
 
 # POWERPC Architecture
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_MEDIATEK_WATCHDOG) += mtk_w
 obj-$(CONFIG_DIGICOLOR_WATCHDOG) += digicolor_wdt.o
 obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o
 obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o
+obj-$(CONFIG_MT7621_WDT) += mt7621_wdt.o
 
 # AVR32 Architecture
 obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
--- /dev/null
+++ b/drivers/watchdog/mt7621_wdt.c
@@ -0,0 +1,185 @@
+/*
+ * Ralink RT288x/RT3xxx/MT76xx built-in hardware watchdog timer
+ *
+ * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * This driver was based on: drivers/watchdog/softdog.c
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/watchdog.h>
+#include <linux/miscdevice.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+#define SYSC_RSTSTAT			0x38
+#define WDT_RST_CAUSE			BIT(1)
+
+#define RALINK_WDT_TIMEOUT		30
+
+#define TIMER_REG_TMRSTAT		0x00
+#define TIMER_REG_TMR1LOAD		0x24
+#define TIMER_REG_TMR1CTL		0x20
+
+#define TMR1CTL_ENABLE			BIT(7)
+#define TMR1CTL_RESTART			BIT(9)
+
+static void __iomem *mt762x_wdt_base;
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+		"Watchdog cannot be stopped once started (default="
+		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static inline void rt_wdt_w32(unsigned reg, u32 val)
+{
+	iowrite32(val, mt762x_wdt_base + reg);
+}
+
+static inline u32 rt_wdt_r32(unsigned reg)
+{
+	return ioread32(mt762x_wdt_base + reg);
+}
+
+static int mt762x_wdt_ping(struct watchdog_device *w)
+{
+	rt_wdt_w32(TIMER_REG_TMRSTAT, TMR1CTL_RESTART);
+
+	return 0;
+}
+
+static int mt762x_wdt_set_timeout(struct watchdog_device *w, unsigned int t)
+{
+	w->timeout = t;
+	rt_wdt_w32(TIMER_REG_TMR1LOAD, t * 1000);
+	mt762x_wdt_ping(w);
+
+	return 0;
+}
+
+static int mt762x_wdt_start(struct watchdog_device *w)
+{
+	u32 t;
+
+	rt_wdt_w32(TIMER_REG_TMR1CTL, 1000 << 16);
+	mt762x_wdt_set_timeout(w, w->timeout);
+
+	t = rt_wdt_r32(TIMER_REG_TMR1CTL);
+	t |= TMR1CTL_ENABLE;
+	rt_wdt_w32(TIMER_REG_TMR1CTL, t);
+
+	return 0;
+}
+
+static int mt762x_wdt_stop(struct watchdog_device *w)
+{
+	u32 t;
+
+	mt762x_wdt_ping(w);
+
+	t = rt_wdt_r32(TIMER_REG_TMR1CTL);
+	t &= ~TMR1CTL_ENABLE;
+	rt_wdt_w32(TIMER_REG_TMR1CTL, t);
+
+	return 0;
+}
+
+static int mt762x_wdt_bootcause(void)
+{
+	if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE)
+		return WDIOF_CARDRESET;
+
+	return 0;
+}
+
+static struct watchdog_info mt762x_wdt_info = {
+	.identity = "Mediatek Watchdog",
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+};
+
+static struct watchdog_ops mt762x_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = mt762x_wdt_start,
+	.stop = mt762x_wdt_stop,
+	.ping = mt762x_wdt_ping,
+	.set_timeout = mt762x_wdt_set_timeout,
+};
+
+static struct watchdog_device mt762x_wdt_dev = {
+	.info = &mt762x_wdt_info,
+	.ops = &mt762x_wdt_ops,
+	.min_timeout = 1,
+};
+
+static int mt762x_wdt_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	int ret;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mt762x_wdt_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mt762x_wdt_base))
+		return PTR_ERR(mt762x_wdt_base);
+
+	device_reset(&pdev->dev);
+
+	mt762x_wdt_dev.dev = &pdev->dev;
+	mt762x_wdt_dev.bootstatus = mt762x_wdt_bootcause();
+	mt762x_wdt_dev.max_timeout = (0xfffful / 1000);
+	mt762x_wdt_dev.timeout = mt762x_wdt_dev.max_timeout;
+
+	watchdog_set_nowayout(&mt762x_wdt_dev, nowayout);
+
+	ret = watchdog_register_device(&mt762x_wdt_dev);
+	if (!ret)
+		dev_info(&pdev->dev, "Initialized\n");
+
+	return 0;
+}
+
+static int mt762x_wdt_remove(struct platform_device *pdev)
+{
+	watchdog_unregister_device(&mt762x_wdt_dev);
+
+	return 0;
+}
+
+static void mt762x_wdt_shutdown(struct platform_device *pdev)
+{
+	mt762x_wdt_stop(&mt762x_wdt_dev);
+}
+
+static const struct of_device_id mt762x_wdt_match[] = {
+	{ .compatible = "mtk,mt7621-wdt" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mt762x_wdt_match);
+
+static struct platform_driver mt762x_wdt_driver = {
+	.probe		= mt762x_wdt_probe,
+	.remove		= mt762x_wdt_remove,
+	.shutdown	= mt762x_wdt_shutdown,
+	.driver		= {
+		.name		= KBUILD_MODNAME,
+		.owner		= THIS_MODULE,
+		.of_match_table	= mt762x_wdt_match,
+	},
+};
+
+module_platform_driver(mt762x_wdt_driver);
+
+MODULE_DESCRIPTION("MediaTek MT762x hardware watchdog driver");
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);