Linux-2.6.12-rc2
[linux-3.10.git] / arch / arm / mach-footbridge / ebsa285-leds.c
1 /*
2  *  linux/arch/arm/mach-footbridge/ebsa285-leds.c
3  *
4  *  Copyright (C) 1998-1999 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  * EBSA-285 control routines.
10  *
11  * The EBSA-285 uses the leds as follows:
12  *  - Green - toggles state every 50 timer interrupts
13  *  - Amber - On if system is not idle
14  *  - Red   - currently unused
15  *
16  * Changelog:
17  *   02-05-1999 RMK     Various cleanups
18  */
19 #include <linux/config.h>
20 #include <linux/module.h>
21 #include <linux/kernel.h>
22 #include <linux/init.h>
23 #include <linux/spinlock.h>
24
25 #include <asm/hardware.h>
26 #include <asm/leds.h>
27 #include <asm/mach-types.h>
28 #include <asm/system.h>
29
30 #define LED_STATE_ENABLED       1
31 #define LED_STATE_CLAIMED       2
32 static char led_state;
33 static char hw_led_state;
34
35 static DEFINE_SPINLOCK(leds_lock);
36
37 static void ebsa285_leds_event(led_event_t evt)
38 {
39         unsigned long flags;
40
41         spin_lock_irqsave(&leds_lock, flags);
42
43         switch (evt) {
44         case led_start:
45                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
46 #ifndef CONFIG_LEDS_CPU
47                 hw_led_state |= XBUS_LED_AMBER;
48 #endif
49                 led_state |= LED_STATE_ENABLED;
50                 break;
51
52         case led_stop:
53                 led_state &= ~LED_STATE_ENABLED;
54                 break;
55
56         case led_claim:
57                 led_state |= LED_STATE_CLAIMED;
58                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
59                 break;
60
61         case led_release:
62                 led_state &= ~LED_STATE_CLAIMED;
63                 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
64                 break;
65
66 #ifdef CONFIG_LEDS_TIMER
67         case led_timer:
68                 if (!(led_state & LED_STATE_CLAIMED))
69                         hw_led_state ^= XBUS_LED_GREEN;
70                 break;
71 #endif
72
73 #ifdef CONFIG_LEDS_CPU
74         case led_idle_start:
75                 if (!(led_state & LED_STATE_CLAIMED))
76                         hw_led_state |= XBUS_LED_AMBER;
77                 break;
78
79         case led_idle_end:
80                 if (!(led_state & LED_STATE_CLAIMED))
81                         hw_led_state &= ~XBUS_LED_AMBER;
82                 break;
83 #endif
84
85         case led_halted:
86                 if (!(led_state & LED_STATE_CLAIMED))
87                         hw_led_state &= ~XBUS_LED_RED;
88                 break;
89
90         case led_green_on:
91                 if (led_state & LED_STATE_CLAIMED)
92                         hw_led_state &= ~XBUS_LED_GREEN;
93                 break;
94
95         case led_green_off:
96                 if (led_state & LED_STATE_CLAIMED)
97                         hw_led_state |= XBUS_LED_GREEN;
98                 break;
99
100         case led_amber_on:
101                 if (led_state & LED_STATE_CLAIMED)
102                         hw_led_state &= ~XBUS_LED_AMBER;
103                 break;
104
105         case led_amber_off:
106                 if (led_state & LED_STATE_CLAIMED)
107                         hw_led_state |= XBUS_LED_AMBER;
108                 break;
109
110         case led_red_on:
111                 if (led_state & LED_STATE_CLAIMED)
112                         hw_led_state &= ~XBUS_LED_RED;
113                 break;
114
115         case led_red_off:
116                 if (led_state & LED_STATE_CLAIMED)
117                         hw_led_state |= XBUS_LED_RED;
118                 break;
119
120         default:
121                 break;
122         }
123
124         if  (led_state & LED_STATE_ENABLED)
125                 *XBUS_LEDS = hw_led_state;
126
127         spin_unlock_irqrestore(&leds_lock, flags);
128 }
129
130 static int __init leds_init(void)
131 {
132         if (machine_is_ebsa285() || machine_is_co285())
133                 leds_event = ebsa285_leds_event;
134
135         leds_event(led_start);
136
137         return 0;
138 }
139
140 __initcall(leds_init);