1 /*
2 * arch/arm/mach-shark/leds.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 */
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 #include <linux/io.h>
24
25 #include <asm/leds.h>
26 #include <asm/system.h>
27
28 #define LED_STATE_ENABLED 1
29 #define LED_STATE_CLAIMED 2
30
31 #define SEQUOIA_LED_GREEN (1<<6)
32 #define SEQUOIA_LED_AMBER (1<<5)
33 #define SEQUOIA_LED_BACK (1<<7)
34
35 static char led_state;
36 static short hw_led_state;
37 static short saved_state;
38
39 static DEFINE_RAW_SPINLOCK(leds_lock);
40
sequoia_read(int addr)41 short sequoia_read(int addr) {
42 outw(addr,0x24);
43 return inw(0x26);
44 }
45
sequoia_write(short value,short addr)46 void sequoia_write(short value,short addr) {
47 outw(addr,0x24);
48 outw(value,0x26);
49 }
50
sequoia_leds_event(led_event_t evt)51 static void sequoia_leds_event(led_event_t evt)
52 {
53 unsigned long flags;
54
55 raw_spin_lock_irqsave(&leds_lock, flags);
56
57 hw_led_state = sequoia_read(0x09);
58
59 switch (evt) {
60 case led_start:
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;
65 #else
66 hw_led_state &= ~SEQUOIA_LED_BACK;
67 #endif
68 led_state |= LED_STATE_ENABLED;
69 break;
70
71 case led_stop:
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;
76 break;
77
78 case led_claim:
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;
84 break;
85
86 case led_release:
87 led_state &= ~LED_STATE_CLAIMED;
88 hw_led_state = saved_state;
89 break;
90
91 #ifdef CONFIG_LEDS_TIMER
92 case led_timer:
93 if (!(led_state & LED_STATE_CLAIMED))
94 hw_led_state ^= SEQUOIA_LED_GREEN;
95 break;
96 #endif
97
98 #ifdef CONFIG_LEDS_CPU
99 case led_idle_start:
100 if (!(led_state & LED_STATE_CLAIMED))
101 hw_led_state &= ~SEQUOIA_LED_BACK;
102 break;
103
104 case led_idle_end:
105 if (!(led_state & LED_STATE_CLAIMED))
106 hw_led_state |= SEQUOIA_LED_BACK;
107 break;
108 #endif
109
110 case led_green_on:
111 if (led_state & LED_STATE_CLAIMED)
112 hw_led_state &= ~SEQUOIA_LED_GREEN;
113 break;
114
115 case led_green_off:
116 if (led_state & LED_STATE_CLAIMED)
117 hw_led_state |= SEQUOIA_LED_GREEN;
118 break;
119
120 case led_amber_on:
121 if (led_state & LED_STATE_CLAIMED)
122 hw_led_state &= ~SEQUOIA_LED_AMBER;
123 break;
124
125 case led_amber_off:
126 if (led_state & LED_STATE_CLAIMED)
127 hw_led_state |= SEQUOIA_LED_AMBER;
128 break;
129
130 case led_red_on:
131 if (led_state & LED_STATE_CLAIMED)
132 hw_led_state |= SEQUOIA_LED_BACK;
133 break;
134
135 case led_red_off:
136 if (led_state & LED_STATE_CLAIMED)
137 hw_led_state &= ~SEQUOIA_LED_BACK;
138 break;
139
140 default:
141 break;
142 }
143
144 if (led_state & LED_STATE_ENABLED)
145 sequoia_write(hw_led_state,0x09);
146
147 raw_spin_unlock_irqrestore(&leds_lock, flags);
148 }
149
leds_init(void)150 static int __init leds_init(void)
151 {
152 extern void (*leds_event)(led_event_t);
153 short temp;
154
155 leds_event = sequoia_leds_event;
156
157 /* Make LEDs independent of power-state */
158 request_region(0x24,4,"sequoia");
159 temp = sequoia_read(0x09);
160 temp |= 1<<10;
161 sequoia_write(temp,0x09);
162 leds_event(led_start);
163 return 0;
164 }
165
166 __initcall(leds_init);
167