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 */
12#include <linux/config.h>
13#include <linux/init.h>
14
15#include <asm/hardware.h>
16#include <asm/leds.h>
17#include <asm/system.h>
18
19#include "leds.h"
20
21
22#define LED_STATE_ENABLED	1
23#define LED_STATE_CLAIMED	2
24
25static unsigned int led_state;
26static unsigned int hw_led_state;
27
28#define LED_23    GPIO_GPIO23
29#define LED_MASK  (LED_23)
30
31void lart_leds_event(led_event_t evt)
32{
33	unsigned long flags;
34
35	local_irq_save(flags);
36
37	switch(evt) {
38	case led_start:
39		/* pin 23 is output pin */
40		GPDR |= LED_23;
41		hw_led_state = LED_MASK;
42		led_state = LED_STATE_ENABLED;
43		break;
44
45	case led_stop:
46		led_state &= ~LED_STATE_ENABLED;
47		break;
48
49	case led_claim:
50		led_state |= LED_STATE_CLAIMED;
51		hw_led_state = LED_MASK;
52		break;
53
54	case led_release:
55		led_state &= ~LED_STATE_CLAIMED;
56		hw_led_state = LED_MASK;
57		break;
58
59#ifdef CONFIG_LEDS_TIMER
60	case led_timer:
61		if (!(led_state & LED_STATE_CLAIMED))
62			hw_led_state ^= LED_23;
63		break;
64#endif
65
66#ifdef CONFIG_LEDS_CPU
67	case led_idle_start:
68		/* The LART people like the LED to be off when the
69                   system is idle... */
70		if (!(led_state & LED_STATE_CLAIMED))
71			hw_led_state &= ~LED_23;
72		break;
73
74	case led_idle_end:
75		/* ... and on if the system is not idle */
76		if (!(led_state & LED_STATE_CLAIMED))
77			hw_led_state |= LED_23;
78		break;
79#endif
80
81	case led_red_on:
82		if (led_state & LED_STATE_CLAIMED)
83			hw_led_state &= ~LED_23;
84		break;
85
86	case led_red_off:
87		if (led_state & LED_STATE_CLAIMED)
88			hw_led_state |= LED_23;
89		break;
90
91	default:
92		break;
93	}
94
95	/* Now set the GPIO state, or nothing will happen at all */
96	if (led_state & LED_STATE_ENABLED) {
97		GPSR = hw_led_state;
98		GPCR = hw_led_state ^ LED_MASK;
99	}
100
101	local_irq_restore(flags);
102}
103