Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f30c2269 | 2 | * arch/arm/mach-shark/leds.c |
1da177e4 LT |
3 | * by Alexander Schulz |
4 | * | |
5 | * derived from: | |
6 | * arch/arm/kernel/leds-footbridge.c | |
7 | * Copyright (C) 1998-1999 Russell King | |
8 | * | |
9 | * DIGITAL Shark LED control routines. | |
10 | * | |
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 | |
15 | * | |
16 | * Changelog: | |
17 | */ | |
1da177e4 LT |
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> | |
fced80c7 | 23 | #include <linux/io.h> |
1da177e4 | 24 | |
1da177e4 | 25 | #include <asm/leds.h> |
1da177e4 LT |
26 | |
27 | #define LED_STATE_ENABLED 1 | |
28 | #define LED_STATE_CLAIMED 2 | |
eab184c2 AS |
29 | |
30 | #define SEQUOIA_LED_GREEN (1<<6) | |
31 | #define SEQUOIA_LED_AMBER (1<<5) | |
32 | #define SEQUOIA_LED_BACK (1<<7) | |
33 | ||
1da177e4 LT |
34 | static char led_state; |
35 | static short hw_led_state; | |
36 | static short saved_state; | |
37 | ||
bd31b859 | 38 | static DEFINE_RAW_SPINLOCK(leds_lock); |
1da177e4 LT |
39 | |
40 | short sequoia_read(int addr) { | |
41 | outw(addr,0x24); | |
42 | return inw(0x26); | |
43 | } | |
44 | ||
45 | void sequoia_write(short value,short addr) { | |
46 | outw(addr,0x24); | |
47 | outw(value,0x26); | |
48 | } | |
49 | ||
50 | static void sequoia_leds_event(led_event_t evt) | |
51 | { | |
52 | unsigned long flags; | |
53 | ||
bd31b859 | 54 | raw_spin_lock_irqsave(&leds_lock, flags); |
1da177e4 LT |
55 | |
56 | hw_led_state = sequoia_read(0x09); | |
57 | ||
58 | switch (evt) { | |
59 | case led_start: | |
60 | hw_led_state |= SEQUOIA_LED_GREEN; | |
61 | hw_led_state |= SEQUOIA_LED_AMBER; | |
62 | #ifdef CONFIG_LEDS_CPU | |
63 | hw_led_state |= SEQUOIA_LED_BACK; | |
64 | #else | |
65 | hw_led_state &= ~SEQUOIA_LED_BACK; | |
66 | #endif | |
67 | led_state |= LED_STATE_ENABLED; | |
68 | break; | |
69 | ||
70 | case led_stop: | |
71 | hw_led_state &= ~SEQUOIA_LED_BACK; | |
72 | hw_led_state |= SEQUOIA_LED_GREEN; | |
73 | hw_led_state |= SEQUOIA_LED_AMBER; | |
74 | led_state &= ~LED_STATE_ENABLED; | |
75 | break; | |
76 | ||
77 | case led_claim: | |
78 | led_state |= LED_STATE_CLAIMED; | |
79 | saved_state = hw_led_state; | |
80 | hw_led_state &= ~SEQUOIA_LED_BACK; | |
81 | hw_led_state |= SEQUOIA_LED_GREEN; | |
82 | hw_led_state |= SEQUOIA_LED_AMBER; | |
83 | break; | |
84 | ||
85 | case led_release: | |
86 | led_state &= ~LED_STATE_CLAIMED; | |
87 | hw_led_state = saved_state; | |
88 | break; | |
89 | ||
90 | #ifdef CONFIG_LEDS_TIMER | |
91 | case led_timer: | |
92 | if (!(led_state & LED_STATE_CLAIMED)) | |
93 | hw_led_state ^= SEQUOIA_LED_GREEN; | |
94 | break; | |
95 | #endif | |
96 | ||
97 | #ifdef CONFIG_LEDS_CPU | |
98 | case led_idle_start: | |
99 | if (!(led_state & LED_STATE_CLAIMED)) | |
100 | hw_led_state &= ~SEQUOIA_LED_BACK; | |
101 | break; | |
102 | ||
103 | case led_idle_end: | |
104 | if (!(led_state & LED_STATE_CLAIMED)) | |
105 | hw_led_state |= SEQUOIA_LED_BACK; | |
106 | break; | |
107 | #endif | |
108 | ||
109 | case led_green_on: | |
110 | if (led_state & LED_STATE_CLAIMED) | |
111 | hw_led_state &= ~SEQUOIA_LED_GREEN; | |
112 | break; | |
113 | ||
114 | case led_green_off: | |
115 | if (led_state & LED_STATE_CLAIMED) | |
116 | hw_led_state |= SEQUOIA_LED_GREEN; | |
117 | break; | |
118 | ||
119 | case led_amber_on: | |
120 | if (led_state & LED_STATE_CLAIMED) | |
121 | hw_led_state &= ~SEQUOIA_LED_AMBER; | |
122 | break; | |
123 | ||
124 | case led_amber_off: | |
125 | if (led_state & LED_STATE_CLAIMED) | |
126 | hw_led_state |= SEQUOIA_LED_AMBER; | |
127 | break; | |
128 | ||
129 | case led_red_on: | |
130 | if (led_state & LED_STATE_CLAIMED) | |
131 | hw_led_state |= SEQUOIA_LED_BACK; | |
132 | break; | |
133 | ||
134 | case led_red_off: | |
135 | if (led_state & LED_STATE_CLAIMED) | |
136 | hw_led_state &= ~SEQUOIA_LED_BACK; | |
137 | break; | |
138 | ||
139 | default: | |
140 | break; | |
141 | } | |
142 | ||
143 | if (led_state & LED_STATE_ENABLED) | |
144 | sequoia_write(hw_led_state,0x09); | |
145 | ||
bd31b859 | 146 | raw_spin_unlock_irqrestore(&leds_lock, flags); |
1da177e4 LT |
147 | } |
148 | ||
149 | static int __init leds_init(void) | |
150 | { | |
151 | extern void (*leds_event)(led_event_t); | |
152 | short temp; | |
153 | ||
154 | leds_event = sequoia_leds_event; | |
155 | ||
156 | /* Make LEDs independent of power-state */ | |
157 | request_region(0x24,4,"sequoia"); | |
158 | temp = sequoia_read(0x09); | |
159 | temp |= 1<<10; | |
160 | sequoia_write(temp,0x09); | |
161 | leds_event(led_start); | |
162 | return 0; | |
163 | } | |
164 | ||
165 | __initcall(leds_init); |