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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/mach-integrator/leds.c
10817 views
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/*

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 *  linux/arch/arm/mach-integrator/leds.c

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 *

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 *  Integrator/AP and Integrator/CP LED control routines

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 *

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 *  Copyright (C) 1999 ARM Limited

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 *  Copyright (C) 2000 Deep Blue Solutions Ltd

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 *

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License as published by

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 * the Free Software Foundation; either version 2 of the License, or

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 * (at your option) any later version.

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 *

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 * This program is distributed in the hope that it will be useful,

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 * but WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 * GNU General Public License for more details.

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 *

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 * You should have received a copy of the GNU General Public License

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 * along with this program; if not, write to the Free Software

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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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 */

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#include <linux/kernel.h>

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#include <linux/init.h>

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#include <linux/smp.h>

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#include <linux/spinlock.h>

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#include <linux/io.h>

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#include <mach/hardware.h>

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#include <mach/platform.h>

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#include <asm/leds.h>

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#include <asm/system.h>

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#include <asm/mach-types.h>

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#include <mach/cm.h>

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static int saved_leds;

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static void integrator_leds_event(led_event_t ledevt)

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{

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	unsigned long flags;

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	const unsigned int dbg_base = IO_ADDRESS(INTEGRATOR_DBG_BASE);

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	unsigned int update_alpha_leds;

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	// yup, change the LEDs

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	local_irq_save(flags);

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	update_alpha_leds = 0;

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	switch(ledevt) {

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	case led_idle_start:

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		cm_control(CM_CTRL_LED, 0);

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		break;

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	case led_idle_end:

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		cm_control(CM_CTRL_LED, CM_CTRL_LED);

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		break;

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	case led_timer:

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		saved_leds ^= GREEN_LED;

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		update_alpha_leds = 1;

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		break;

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	case led_red_on:

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		saved_leds |= RED_LED;

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		update_alpha_leds = 1;

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		break;

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	case led_red_off:

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		saved_leds &= ~RED_LED;

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		update_alpha_leds = 1;

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		break;

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	default:

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		break;

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	}

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	if (update_alpha_leds) {

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		while (__raw_readl(dbg_base + INTEGRATOR_DBG_ALPHA_OFFSET) & 1);

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		__raw_writel(saved_leds, dbg_base + INTEGRATOR_DBG_LEDS_OFFSET);

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	}

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	local_irq_restore(flags);

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}

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static int __init leds_init(void)

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{

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	if (machine_is_integrator() || machine_is_cintegrator())

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		leds_event = integrator_leds_event;

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	return 0;

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}

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core_initcall(leds_init);

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