2 * arch/arm/mach-shark/leds.c
6 * arch/arm/kernel/leds-footbridge.c
7 * Copyright (C) 1998-1999 Russell King
9 * DIGITAL Shark LED control routines.
11 * The leds use is as follows:
12 * - Green front - toggles state every 50 timer interrupts
13 * - Amber front - Unused, this is a dual color led (Amber/Green)
14 * - Amber back - On if system is not idle
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/spinlock.h>
22 #include <linux/ioport.h>
26 #include <asm/system.h>
28 #define LED_STATE_ENABLED 1
29 #define LED_STATE_CLAIMED 2
31 #define SEQUOIA_LED_GREEN (1<<6)
32 #define SEQUOIA_LED_AMBER (1<<5)
33 #define SEQUOIA_LED_BACK (1<<7)
35 static char led_state;
36 static short hw_led_state;
37 static short saved_state;
39 static DEFINE_SPINLOCK(leds_lock);
41 short sequoia_read(int addr) {
46 void sequoia_write(short value,short addr) {
51 static void sequoia_leds_event(led_event_t evt)
55 spin_lock_irqsave(&leds_lock, flags);
57 hw_led_state = sequoia_read(0x09);
61 hw_led_state |= SEQUOIA_LED_GREEN;
62 hw_led_state |= SEQUOIA_LED_AMBER;
63 #ifdef CONFIG_LEDS_CPU
64 hw_led_state |= SEQUOIA_LED_BACK;
66 hw_led_state &= ~SEQUOIA_LED_BACK;
68 led_state |= LED_STATE_ENABLED;
72 hw_led_state &= ~SEQUOIA_LED_BACK;
73 hw_led_state |= SEQUOIA_LED_GREEN;
74 hw_led_state |= SEQUOIA_LED_AMBER;
75 led_state &= ~LED_STATE_ENABLED;
79 led_state |= LED_STATE_CLAIMED;
80 saved_state = hw_led_state;
81 hw_led_state &= ~SEQUOIA_LED_BACK;
82 hw_led_state |= SEQUOIA_LED_GREEN;
83 hw_led_state |= SEQUOIA_LED_AMBER;
87 led_state &= ~LED_STATE_CLAIMED;
88 hw_led_state = saved_state;
91 #ifdef CONFIG_LEDS_TIMER
93 if (!(led_state & LED_STATE_CLAIMED))
94 hw_led_state ^= SEQUOIA_LED_GREEN;
98 #ifdef CONFIG_LEDS_CPU
100 if (!(led_state & LED_STATE_CLAIMED))
101 hw_led_state &= ~SEQUOIA_LED_BACK;
105 if (!(led_state & LED_STATE_CLAIMED))
106 hw_led_state |= SEQUOIA_LED_BACK;
111 if (led_state & LED_STATE_CLAIMED)
112 hw_led_state &= ~SEQUOIA_LED_GREEN;
116 if (led_state & LED_STATE_CLAIMED)
117 hw_led_state |= SEQUOIA_LED_GREEN;
121 if (led_state & LED_STATE_CLAIMED)
122 hw_led_state &= ~SEQUOIA_LED_AMBER;
126 if (led_state & LED_STATE_CLAIMED)
127 hw_led_state |= SEQUOIA_LED_AMBER;
131 if (led_state & LED_STATE_CLAIMED)
132 hw_led_state |= SEQUOIA_LED_BACK;
136 if (led_state & LED_STATE_CLAIMED)
137 hw_led_state &= ~SEQUOIA_LED_BACK;
144 if (led_state & LED_STATE_ENABLED)
145 sequoia_write(hw_led_state,0x09);
147 spin_unlock_irqrestore(&leds_lock, flags);
150 static int __init leds_init(void)
152 extern void (*leds_event)(led_event_t);
155 leds_event = sequoia_leds_event;
157 /* Make LEDs independent of power-state */
158 request_region(0x24,4,"sequoia");
159 temp = sequoia_read(0x09);
161 sequoia_write(temp,0x09);
162 leds_event(led_start);
166 __initcall(leds_init);