Viewing file:  leds.c (2.27 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* linux/arch/arm/mach-integrator/leds.c
*
* Integrator LED control routines
*
* Copyright (C) 1999 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/leds.h>
#include <asm/system.h>
#include <asm/mach-types.h>
static int saved_leds;
static void integrator_leds_event(led_event_t ledevt)
{
unsigned long flags;
const unsigned int dbg_base = IO_ADDRESS(INTEGRATOR_DBG_BASE);
const unsigned int hdr_ctrl = IO_ADDRESS(INTEGRATOR_HDR_BASE) +
INTEGRATOR_HDR_CTRL_OFFSET;
unsigned int ctrl;
unsigned int update_alpha_leds;
// yup, change the LEDs
local_irq_save(flags);
update_alpha_leds = 0;
switch(ledevt) {
case led_idle_start:
ctrl = __raw_readl(hdr_ctrl);
ctrl &= ~INTEGRATOR_HDR_CTRL_LED;
__raw_writel(ctrl, hdr_ctrl);
break;
case led_idle_end:
ctrl = __raw_readl(hdr_ctrl);
ctrl |= INTEGRATOR_HDR_CTRL_LED;
__raw_writel(ctrl, hdr_ctrl);
break;
case led_timer:
saved_leds ^= GREEN_LED;
update_alpha_leds = 1;
break;
case led_red_on:
saved_leds |= RED_LED;
update_alpha_leds = 1;
break;
case led_red_off:
saved_leds &= ~RED_LED;
update_alpha_leds = 1;
break;
default:
break;
}
if (update_alpha_leds) {
while (__raw_readl(dbg_base + INTEGRATOR_DBG_ALPHA_OFFSET) & 1);
__raw_writel(saved_leds, dbg_base + INTEGRATOR_DBG_LEDS_OFFSET);
}
local_irq_restore(flags);
}
static int __init leds_init(void)
{
if (machine_is_integrator())
leds_event = integrator_leds_event;
return 0;
}
__initcall(leds_init);
|