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 
assabet_leds_event(led_event_t evt)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 }
116