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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mach-sa1100/leds-lart.c | |
3 | * | |
4 | * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000 | |
5 | * | |
6 | * LART uses the LED as follows: | |
7 | * - GPIO23 is the LED, on if system is not idle | |
8 | * You can use both CONFIG_LEDS_CPU and CONFIG_LEDS_TIMER at the same | |
9 | * time, but in that case the timer events will still dictate the | |
10 | * pace of the LED. | |
11 | */ | |
1da177e4 LT |
12 | #include <linux/init.h> |
13 | ||
14 | #include <asm/hardware.h> | |
15 | #include <asm/leds.h> | |
16 | #include <asm/system.h> | |
17 | ||
18 | #include "leds.h" | |
19 | ||
20 | ||
21 | #define LED_STATE_ENABLED 1 | |
22 | #define LED_STATE_CLAIMED 2 | |
23 | ||
24 | static unsigned int led_state; | |
25 | static unsigned int hw_led_state; | |
26 | ||
27 | #define LED_23 GPIO_GPIO23 | |
28 | #define LED_MASK (LED_23) | |
29 | ||
30 | void lart_leds_event(led_event_t evt) | |
31 | { | |
32 | unsigned long flags; | |
33 | ||
34 | local_irq_save(flags); | |
35 | ||
36 | switch(evt) { | |
37 | case led_start: | |
38 | /* pin 23 is output pin */ | |
39 | GPDR |= LED_23; | |
40 | hw_led_state = LED_MASK; | |
41 | led_state = LED_STATE_ENABLED; | |
42 | break; | |
43 | ||
44 | case led_stop: | |
45 | led_state &= ~LED_STATE_ENABLED; | |
46 | break; | |
47 | ||
48 | case led_claim: | |
49 | led_state |= LED_STATE_CLAIMED; | |
50 | hw_led_state = LED_MASK; | |
51 | break; | |
52 | ||
53 | case led_release: | |
54 | led_state &= ~LED_STATE_CLAIMED; | |
55 | hw_led_state = LED_MASK; | |
56 | break; | |
57 | ||
58 | #ifdef CONFIG_LEDS_TIMER | |
59 | case led_timer: | |
60 | if (!(led_state & LED_STATE_CLAIMED)) | |
61 | hw_led_state ^= LED_23; | |
62 | break; | |
63 | #endif | |
64 | ||
65 | #ifdef CONFIG_LEDS_CPU | |
66 | case led_idle_start: | |
67 | /* The LART people like the LED to be off when the | |
68 | system is idle... */ | |
69 | if (!(led_state & LED_STATE_CLAIMED)) | |
70 | hw_led_state &= ~LED_23; | |
71 | break; | |
72 | ||
73 | case led_idle_end: | |
74 | /* ... and on if the system is not idle */ | |
75 | if (!(led_state & LED_STATE_CLAIMED)) | |
76 | hw_led_state |= LED_23; | |
77 | break; | |
78 | #endif | |
79 | ||
80 | case led_red_on: | |
81 | if (led_state & LED_STATE_CLAIMED) | |
82 | hw_led_state &= ~LED_23; | |
83 | break; | |
84 | ||
85 | case led_red_off: | |
86 | if (led_state & LED_STATE_CLAIMED) | |
87 | hw_led_state |= LED_23; | |
88 | break; | |
89 | ||
90 | default: | |
91 | break; | |
92 | } | |
93 | ||
94 | /* Now set the GPIO state, or nothing will happen at all */ | |
95 | if (led_state & LED_STATE_ENABLED) { | |
96 | GPSR = hw_led_state; | |
97 | GPCR = hw_led_state ^ LED_MASK; | |
98 | } | |
99 | ||
100 | local_irq_restore(flags); | |
101 | } |