1 /*
2 * linux/arch/arm/mach-integrator/leds.c
3 *
4 * Integrator/AP and Integrator/CP LED control routines
5 *
6 * Copyright (C) 1999 ARM Limited
7 * Copyright (C) 2000 Deep Blue Solutions Ltd
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23 #include <linux/kernel.h>
24 #include <linux/init.h>
25 #include <linux/smp.h>
26 #include <linux/spinlock.h>
27 #include <linux/io.h>
28
29 #include <mach/hardware.h>
30 #include <mach/platform.h>
31 #include <asm/leds.h>
32 #include <asm/system.h>
33 #include <asm/mach-types.h>
34 #include <mach/cm.h>
35
36 static int saved_leds;
37
integrator_leds_event(led_event_t ledevt)38 static void integrator_leds_event(led_event_t ledevt)
39 {
40 unsigned long flags;
41 const unsigned int dbg_base = IO_ADDRESS(INTEGRATOR_DBG_BASE);
42 unsigned int update_alpha_leds;
43
44 // yup, change the LEDs
45 local_irq_save(flags);
46 update_alpha_leds = 0;
47
48 switch(ledevt) {
49 case led_idle_start:
50 cm_control(CM_CTRL_LED, 0);
51 break;
52
53 case led_idle_end:
54 cm_control(CM_CTRL_LED, CM_CTRL_LED);
55 break;
56
57 case led_timer:
58 saved_leds ^= GREEN_LED;
59 update_alpha_leds = 1;
60 break;
61
62 case led_red_on:
63 saved_leds |= RED_LED;
64 update_alpha_leds = 1;
65 break;
66
67 case led_red_off:
68 saved_leds &= ~RED_LED;
69 update_alpha_leds = 1;
70 break;
71
72 default:
73 break;
74 }
75
76 if (update_alpha_leds) {
77 while (__raw_readl(dbg_base + INTEGRATOR_DBG_ALPHA_OFFSET) & 1);
78 __raw_writel(saved_leds, dbg_base + INTEGRATOR_DBG_LEDS_OFFSET);
79 }
80 local_irq_restore(flags);
81 }
82
leds_init(void)83 static int __init leds_init(void)
84 {
85 if (machine_is_integrator() || machine_is_cintegrator())
86 leds_event = integrator_leds_event;
87
88 return 0;
89 }
90
91 core_initcall(leds_init);
92