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9#include <linux/module.h>
10#include <linux/watchdog.h>
11#include <linux/platform_device.h>
12#include <linux/moduleparam.h>
13#include <linux/of.h>
14#include <linux/io.h>
15#include <linux/uaccess.h>
16
17#define CLOCK_FREQ 1000000
18
19#define SIRFSOC_TIMER_COUNTER_LO 0x0000
20#define SIRFSOC_TIMER_MATCH_0 0x0008
21#define SIRFSOC_TIMER_INT_EN 0x0024
22#define SIRFSOC_TIMER_WATCHDOG_EN 0x0028
23#define SIRFSOC_TIMER_LATCH 0x0030
24#define SIRFSOC_TIMER_LATCHED_LO 0x0034
25
26#define SIRFSOC_TIMER_WDT_INDEX 5
27
28#define SIRFSOC_WDT_MIN_TIMEOUT 30
29#define SIRFSOC_WDT_MAX_TIMEOUT (10 * 60)
30#define SIRFSOC_WDT_DEFAULT_TIMEOUT 30
31
32static unsigned int timeout = SIRFSOC_WDT_DEFAULT_TIMEOUT;
33static bool nowayout = WATCHDOG_NOWAYOUT;
34
35module_param(timeout, uint, 0);
36module_param(nowayout, bool, 0);
37
38MODULE_PARM_DESC(timeout, "Default watchdog timeout (in seconds)");
39MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
40 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
41
42static unsigned int sirfsoc_wdt_gettimeleft(struct watchdog_device *wdd)
43{
44 u32 counter, match;
45 void __iomem *wdt_base;
46 int time_left;
47
48 wdt_base = watchdog_get_drvdata(wdd);
49 counter = readl(wdt_base + SIRFSOC_TIMER_COUNTER_LO);
50 match = readl(wdt_base +
51 SIRFSOC_TIMER_MATCH_0 + (SIRFSOC_TIMER_WDT_INDEX << 2));
52
53 time_left = match - counter;
54
55 return time_left / CLOCK_FREQ;
56}
57
58static int sirfsoc_wdt_updatetimeout(struct watchdog_device *wdd)
59{
60 u32 counter, timeout_ticks;
61 void __iomem *wdt_base;
62
63 timeout_ticks = wdd->timeout * CLOCK_FREQ;
64 wdt_base = watchdog_get_drvdata(wdd);
65
66
67 writel(1, wdt_base + SIRFSOC_TIMER_LATCH);
68
69
70 counter = readl(wdt_base + SIRFSOC_TIMER_LATCHED_LO);
71
72 counter += timeout_ticks;
73
74 writel(counter, wdt_base +
75 SIRFSOC_TIMER_MATCH_0 + (SIRFSOC_TIMER_WDT_INDEX << 2));
76
77 return 0;
78}
79
80static int sirfsoc_wdt_enable(struct watchdog_device *wdd)
81{
82 void __iomem *wdt_base = watchdog_get_drvdata(wdd);
83 sirfsoc_wdt_updatetimeout(wdd);
84
85
86
87
88
89 writel(readl(wdt_base + SIRFSOC_TIMER_INT_EN)
90 | (1 << SIRFSOC_TIMER_WDT_INDEX),
91 wdt_base + SIRFSOC_TIMER_INT_EN);
92 writel(1, wdt_base + SIRFSOC_TIMER_WATCHDOG_EN);
93
94 return 0;
95}
96
97static int sirfsoc_wdt_disable(struct watchdog_device *wdd)
98{
99 void __iomem *wdt_base = watchdog_get_drvdata(wdd);
100
101 writel(0, wdt_base + SIRFSOC_TIMER_WATCHDOG_EN);
102 writel(readl(wdt_base + SIRFSOC_TIMER_INT_EN)
103 & (~(1 << SIRFSOC_TIMER_WDT_INDEX)),
104 wdt_base + SIRFSOC_TIMER_INT_EN);
105
106 return 0;
107}
108
109static int sirfsoc_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
110{
111 wdd->timeout = to;
112 sirfsoc_wdt_updatetimeout(wdd);
113
114 return 0;
115}
116
117#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)
118
119static const struct watchdog_info sirfsoc_wdt_ident = {
120 .options = OPTIONS,
121 .firmware_version = 0,
122 .identity = "SiRFSOC Watchdog",
123};
124
125static struct watchdog_ops sirfsoc_wdt_ops = {
126 .owner = THIS_MODULE,
127 .start = sirfsoc_wdt_enable,
128 .stop = sirfsoc_wdt_disable,
129 .get_timeleft = sirfsoc_wdt_gettimeleft,
130 .ping = sirfsoc_wdt_updatetimeout,
131 .set_timeout = sirfsoc_wdt_settimeout,
132};
133
134static struct watchdog_device sirfsoc_wdd = {
135 .info = &sirfsoc_wdt_ident,
136 .ops = &sirfsoc_wdt_ops,
137 .timeout = SIRFSOC_WDT_DEFAULT_TIMEOUT,
138 .min_timeout = SIRFSOC_WDT_MIN_TIMEOUT,
139 .max_timeout = SIRFSOC_WDT_MAX_TIMEOUT,
140};
141
142static int sirfsoc_wdt_probe(struct platform_device *pdev)
143{
144 struct resource *res;
145 int ret;
146 void __iomem *base;
147
148 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
149 base = devm_ioremap_resource(&pdev->dev, res);
150 if (IS_ERR(base))
151 return PTR_ERR(base);
152
153 watchdog_set_drvdata(&sirfsoc_wdd, base);
154
155 watchdog_init_timeout(&sirfsoc_wdd, timeout, &pdev->dev);
156 watchdog_set_nowayout(&sirfsoc_wdd, nowayout);
157 sirfsoc_wdd.parent = &pdev->dev;
158
159 ret = watchdog_register_device(&sirfsoc_wdd);
160 if (ret)
161 return ret;
162
163 platform_set_drvdata(pdev, &sirfsoc_wdd);
164
165 return 0;
166}
167
168static void sirfsoc_wdt_shutdown(struct platform_device *pdev)
169{
170 struct watchdog_device *wdd = platform_get_drvdata(pdev);
171
172 sirfsoc_wdt_disable(wdd);
173}
174
175static int sirfsoc_wdt_remove(struct platform_device *pdev)
176{
177 sirfsoc_wdt_shutdown(pdev);
178 return 0;
179}
180
181#ifdef CONFIG_PM_SLEEP
182static int sirfsoc_wdt_suspend(struct device *dev)
183{
184 return 0;
185}
186
187static int sirfsoc_wdt_resume(struct device *dev)
188{
189 struct watchdog_device *wdd = dev_get_drvdata(dev);
190
191
192
193
194
195
196 sirfsoc_wdt_updatetimeout(wdd);
197
198 return 0;
199}
200#endif
201
202static SIMPLE_DEV_PM_OPS(sirfsoc_wdt_pm_ops,
203 sirfsoc_wdt_suspend, sirfsoc_wdt_resume);
204
205static const struct of_device_id sirfsoc_wdt_of_match[] = {
206 { .compatible = "sirf,prima2-tick"},
207 {},
208};
209MODULE_DEVICE_TABLE(of, sirfsoc_wdt_of_match);
210
211static struct platform_driver sirfsoc_wdt_driver = {
212 .driver = {
213 .name = "sirfsoc-wdt",
214 .pm = &sirfsoc_wdt_pm_ops,
215 .of_match_table = sirfsoc_wdt_of_match,
216 },
217 .probe = sirfsoc_wdt_probe,
218 .remove = sirfsoc_wdt_remove,
219 .shutdown = sirfsoc_wdt_shutdown,
220};
221module_platform_driver(sirfsoc_wdt_driver);
222
223MODULE_DESCRIPTION("SiRF SoC watchdog driver");
224MODULE_AUTHOR("Xianglong Du <Xianglong.Du@csr.com>");
225MODULE_LICENSE("GPL v2");
226MODULE_ALIAS("platform:sirfsoc-wdt");
227
