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