Linux-2.6.12-rc2
[linux-2.6.git] / arch / arm / mach-sa1100 / leds-assabet.c
1 /*
2  * linux/arch/arm/mach-sa1100/leds-assabet.c
3  *
4  * Copyright (C) 2000 John Dorsey <john+@cs.cmu.edu>
5  *
6  * Original (leds-footbridge.c) by Russell King
7  *
8  * Assabet uses the LEDs as follows:
9  *   - Green - toggles state every 50 timer interrupts
10  *   - Red   - on if system is not idle
11  */
12 #include <linux/config.h>
13 #include <linux/init.h>
14
15 #include <asm/hardware.h>
16 #include <asm/leds.h>
17 #include <asm/system.h>
18 #include <asm/arch/assabet.h>
19
20 #include "leds.h"
21
22
23 #define LED_STATE_ENABLED       1
24 #define LED_STATE_CLAIMED       2
25
26 static unsigned int led_state;
27 static unsigned int hw_led_state;
28
29 #define ASSABET_BCR_LED_MASK    (ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED)
30
31 void assabet_leds_event(led_event_t evt)
32 {
33         unsigned long flags;
34
35         local_irq_save(flags);
36
37         switch (evt) {
38         case led_start:
39                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
40                 led_state = LED_STATE_ENABLED;
41                 break;
42
43         case led_stop:
44                 led_state &= ~LED_STATE_ENABLED;
45                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
46                 ASSABET_BCR_frob(ASSABET_BCR_LED_MASK, hw_led_state);
47                 break;
48
49         case led_claim:
50                 led_state |= LED_STATE_CLAIMED;
51                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
52                 break;
53
54         case led_release:
55                 led_state &= ~LED_STATE_CLAIMED;
56                 hw_led_state = ASSABET_BCR_LED_RED | ASSABET_BCR_LED_GREEN;
57                 break;
58
59 #ifdef CONFIG_LEDS_TIMER
60         case led_timer:
61                 if (!(led_state & LED_STATE_CLAIMED))
62                         hw_led_state ^= ASSABET_BCR_LED_GREEN;
63                 break;
64 #endif
65
66 #ifdef CONFIG_LEDS_CPU
67         case led_idle_start:
68                 if (!(led_state & LED_STATE_CLAIMED))
69                         hw_led_state |= ASSABET_BCR_LED_RED;
70                 break;
71
72         case led_idle_end:
73                 if (!(led_state & LED_STATE_CLAIMED))
74                         hw_led_state &= ~ASSABET_BCR_LED_RED;
75                 break;
76 #endif
77
78         case led_halted:
79                 break;
80
81         case led_green_on:
82                 if (led_state & LED_STATE_CLAIMED)
83                         hw_led_state &= ~ASSABET_BCR_LED_GREEN;
84                 break;
85
86         case led_green_off:
87                 if (led_state & LED_STATE_CLAIMED)
88                         hw_led_state |= ASSABET_BCR_LED_GREEN;
89                 break;
90
91         case led_amber_on:
92                 break;
93
94         case led_amber_off:
95                 break;
96
97         case led_red_on:
98                 if (led_state & LED_STATE_CLAIMED)
99                         hw_led_state &= ~ASSABET_BCR_LED_RED;
100                 break;
101
102         case led_red_off:
103                 if (led_state & LED_STATE_CLAIMED)
104                         hw_led_state |= ASSABET_BCR_LED_RED;
105                 break;
106
107         default:
108                 break;
109         }
110
111         if  (led_state & LED_STATE_ENABLED)
112                 ASSABET_BCR_frob(ASSABET_BCR_LED_MASK, hw_led_state);
113
114         local_irq_restore(flags);
115 }