This source file includes following definitions.
- period_to_sec
- sec_to_period
- period_to_sec
- sec_to_period
- __booke_wdt_set
- booke_wdt_set
- __booke_wdt_ping
- booke_wdt_ping
- __booke_wdt_enable
- __booke_wdt_disable
- booke_wdt_start
- booke_wdt_stop
- booke_wdt_set_timeout
- booke_wdt_exit
- booke_wdt_init
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11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/module.h>
14 #include <linux/smp.h>
15 #include <linux/watchdog.h>
16
17 #include <asm/reg_booke.h>
18 #include <asm/time.h>
19 #include <asm/div64.h>
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30 #ifdef CONFIG_PPC_FSL_BOOK3E
31 #define WDTP(x) ((((x)&0x3)<<30)|(((x)&0x3c)<<15))
32 #define WDTP_MASK (WDTP(0x3f))
33 #else
34 #define WDTP(x) (TCR_WP(x))
35 #define WDTP_MASK (TCR_WP_MASK)
36 #endif
37
38 static bool booke_wdt_enabled;
39 module_param(booke_wdt_enabled, bool, 0);
40 static int booke_wdt_period = CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT;
41 module_param(booke_wdt_period, int, 0);
42
43 #ifdef CONFIG_PPC_FSL_BOOK3E
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55 static unsigned long long period_to_sec(unsigned int period)
56 {
57 unsigned long long tmp = 1ULL << (64 - period);
58 unsigned long tmp2 = ppc_tb_freq;
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63 tmp2 = tmp2 / 5 * 2;
64
65 do_div(tmp, tmp2);
66 return tmp;
67 }
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73
74 static unsigned int sec_to_period(unsigned int secs)
75 {
76 unsigned int period;
77 for (period = 63; period > 0; period--) {
78 if (period_to_sec(period) >= secs)
79 return period;
80 }
81 return 0;
82 }
83
84 #define MAX_WDT_TIMEOUT period_to_sec(1)
85
86 #else
87
88 static unsigned long long period_to_sec(unsigned int period)
89 {
90 return period;
91 }
92
93 static unsigned int sec_to_period(unsigned int secs)
94 {
95 return secs;
96 }
97
98 #define MAX_WDT_TIMEOUT 3
99
100 #endif
101
102 static void __booke_wdt_set(void *data)
103 {
104 u32 val;
105 struct watchdog_device *wdog = data;
106
107 val = mfspr(SPRN_TCR);
108 val &= ~WDTP_MASK;
109 val |= WDTP(sec_to_period(wdog->timeout));
110
111 mtspr(SPRN_TCR, val);
112 }
113
114 static void booke_wdt_set(void *data)
115 {
116 on_each_cpu(__booke_wdt_set, data, 0);
117 }
118
119 static void __booke_wdt_ping(void *data)
120 {
121 mtspr(SPRN_TSR, TSR_ENW|TSR_WIS);
122 }
123
124 static int booke_wdt_ping(struct watchdog_device *wdog)
125 {
126 on_each_cpu(__booke_wdt_ping, NULL, 0);
127
128 return 0;
129 }
130
131 static void __booke_wdt_enable(void *data)
132 {
133 u32 val;
134 struct watchdog_device *wdog = data;
135
136
137 __booke_wdt_ping(NULL);
138 val = mfspr(SPRN_TCR);
139 val &= ~WDTP_MASK;
140 val |= (TCR_WIE|TCR_WRC(WRC_CHIP)|WDTP(sec_to_period(wdog->timeout)));
141
142 mtspr(SPRN_TCR, val);
143 }
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153 static void __booke_wdt_disable(void *data)
154 {
155 u32 val;
156
157 val = mfspr(SPRN_TCR);
158 val &= ~(TCR_WIE | WDTP_MASK);
159 mtspr(SPRN_TCR, val);
160
161
162 __booke_wdt_ping(NULL);
163
164 }
165
166 static int booke_wdt_start(struct watchdog_device *wdog)
167 {
168 on_each_cpu(__booke_wdt_enable, wdog, 0);
169 pr_debug("watchdog enabled (timeout = %u sec)\n", wdog->timeout);
170
171 return 0;
172 }
173
174 static int booke_wdt_stop(struct watchdog_device *wdog)
175 {
176 on_each_cpu(__booke_wdt_disable, NULL, 0);
177 pr_debug("watchdog disabled\n");
178
179 return 0;
180 }
181
182 static int booke_wdt_set_timeout(struct watchdog_device *wdt_dev,
183 unsigned int timeout)
184 {
185 wdt_dev->timeout = timeout;
186 booke_wdt_set(wdt_dev);
187
188 return 0;
189 }
190
191 static struct watchdog_info booke_wdt_info __ro_after_init = {
192 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
193 .identity = "PowerPC Book-E Watchdog",
194 };
195
196 static const struct watchdog_ops booke_wdt_ops = {
197 .owner = THIS_MODULE,
198 .start = booke_wdt_start,
199 .stop = booke_wdt_stop,
200 .ping = booke_wdt_ping,
201 .set_timeout = booke_wdt_set_timeout,
202 };
203
204 static struct watchdog_device booke_wdt_dev = {
205 .info = &booke_wdt_info,
206 .ops = &booke_wdt_ops,
207 .min_timeout = 1,
208 };
209
210 static void __exit booke_wdt_exit(void)
211 {
212 watchdog_unregister_device(&booke_wdt_dev);
213 }
214
215 static int __init booke_wdt_init(void)
216 {
217 int ret = 0;
218 bool nowayout = WATCHDOG_NOWAYOUT;
219
220 pr_info("powerpc book-e watchdog driver loaded\n");
221 booke_wdt_info.firmware_version = cur_cpu_spec->pvr_value;
222 booke_wdt_set_timeout(&booke_wdt_dev,
223 period_to_sec(booke_wdt_period));
224 watchdog_set_nowayout(&booke_wdt_dev, nowayout);
225 booke_wdt_dev.max_timeout = MAX_WDT_TIMEOUT;
226 if (booke_wdt_enabled)
227 booke_wdt_start(&booke_wdt_dev);
228
229 ret = watchdog_register_device(&booke_wdt_dev);
230
231 return ret;
232 }
233
234 module_init(booke_wdt_init);
235 module_exit(booke_wdt_exit);
236
237 MODULE_ALIAS("booke_wdt");
238 MODULE_DESCRIPTION("PowerPC Book-E watchdog driver");
239 MODULE_LICENSE("GPL");