1 /*
2 * linux/arch/arm/mach-integrator/leds.c
3 *
4 * Integrator 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
26 #include <asm/hardware.h>
27 #include <asm/io.h>
28 #include <asm/leds.h>
29 #include <asm/system.h>
30 #include <asm/mach-types.h>
31
32 static int saved_leds;
33
integrator_leds_event(led_event_t ledevt)34 static void integrator_leds_event(led_event_t ledevt)
35 {
36 unsigned long flags;
37 const unsigned int dbg_base = IO_ADDRESS(INTEGRATOR_DBG_BASE);
38 const unsigned int hdr_ctrl = IO_ADDRESS(INTEGRATOR_HDR_BASE) +
39 INTEGRATOR_HDR_CTRL_OFFSET;
40 unsigned int ctrl;
41 unsigned int update_alpha_leds;
42
43 // yup, change the LEDs
44 local_irq_save(flags);
45 update_alpha_leds = 0;
46
47 switch(ledevt) {
48 case led_idle_start:
49 ctrl = __raw_readl(hdr_ctrl);
50 ctrl &= ~INTEGRATOR_HDR_CTRL_LED;
51 __raw_writel(ctrl, hdr_ctrl);
52 break;
53
54 case led_idle_end:
55 ctrl = __raw_readl(hdr_ctrl);
56 ctrl |= INTEGRATOR_HDR_CTRL_LED;
57 __raw_writel(ctrl, hdr_ctrl);
58 break;
59
60 case led_timer:
61 saved_leds ^= GREEN_LED;
62 update_alpha_leds = 1;
63 break;
64
65 case led_red_on:
66 saved_leds |= RED_LED;
67 update_alpha_leds = 1;
68 break;
69
70 case led_red_off:
71 saved_leds &= ~RED_LED;
72 update_alpha_leds = 1;
73 break;
74
75 default:
76 break;
77 }
78
79 if (update_alpha_leds) {
80 while (__raw_readl(dbg_base + INTEGRATOR_DBG_ALPHA_OFFSET) & 1);
81 __raw_writel(saved_leds, dbg_base + INTEGRATOR_DBG_LEDS_OFFSET);
82 }
83 local_irq_restore(flags);
84 }
85
leds_init(void)86 static int __init leds_init(void)
87 {
88 if (machine_is_integrator())
89 leds_event = integrator_leds_event;
90
91 return 0;
92 }
93
94 __initcall(leds_init);
95