/* 
 * 68328 Power Management Routines
 * 
 *  Copyright (C) 2002 Daniel Potts <danielp@cse.unsw.edu.au>
 *
 *  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
 */

/*
 *  Debug macros 
 */
#define DEBUG 1
#ifdef DEBUG
#  define DPRINTK(fmt, args...)	printk("%s: " fmt, __FUNCTION__ , ## args)
#else
#  define DPRINTK(fmt, args...)
#endif


#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/sysctl.h>

#include <linux/acpi.h> /* WARNING: included for CTL_ACPI and ACPI_S1_SLP_TYP */

#include <asm/MC68VZ328.h>

#include <linux/interrupt.h> /* for interrupt stuff (that shouldn't be here)*/
#include <asm/irq.h>

unsigned long sleep_irq_mask = 0L; /* irqs to enable while in sleep mode */

#ifdef CONFIG_68328_SERIAL
void shutdown_console(void);
void startup_console(void);
#endif

void set_sleep_mask(unsigned long mask)
{
	sleep_irq_mask = mask;
}

int cpu_suspend(void)
{
	unsigned long flags;
	unsigned long imr_flags;

	/* ZZZZzzzz */
	save_flags(flags);
	cli();
	imr_flags = IMR;

#ifdef CONFIG_68328_SERIAL
	/* Console is shutdown here as a special device,
	 * to ensure that the kernel will not hang trying to write to console.
	 */
	shutdown_console();
#endif

	/* write out sleep enabled interrupts */
	IMR = ~(sleep_irq_mask);    

#if 1
	/* Stop clock - DOZE mode */
	PCTRL = PCTRL_PCEN;
#else
	PLLCR |= PLLCR_DISPLL;
#endif

	__asm__("stop #0x2000" : : : "cc");

#ifdef CONFIG_68328_SERIAL
	startup_console();
#endif

	IMR = imr_flags;
	restore_flags(flags);

	return 0;
}

static int sysctl_pm_do_suspend(ctl_table *table, int write, struct file *filp,
                  void *buffer, size_t *lenp)
{
	int r = 0;

	*lenp = 0;

	DPRINTK("Suspending..\n");

	r = pm_send_all(PM_SUSPEND, (void *)2);
	if (r) {
		return r;
	}

	r = cpu_suspend();

	pm_send_all(PM_RESUME, (void *)0);

	DPRINTK("Resumed..\n");

	return r;
}


static struct ctl_table pm_table[] = 
{
	{ACPI_S1_SLP_TYP, "suspend", NULL, 0, 0600, NULL, (proc_handler *)&sysctl_pm_do_suspend},
	{0}
};

static struct ctl_table pm_dir_table[] =
{
	{CTL_ACPI, "pm", NULL, 0, 0555, pm_table},
	{0}
};

void pm_irq(int irq, void *dev_id, struct pt_regs *regs)
{


	{
	unsigned long flags;
	
	save_flags(flags);
	cli();

	ISR |= ISR_IRQ3; /* ack edge interrupt */

	PDSEL |= 0x01;
	PDDIR |= 0x01;
	PDDATA ^= 0x01;

	restore_flags(flags);
	}
}

/*
 * Initialize power interface
 */
static int __init pm_init(void)
{

	printk("Power management driver for 68328, Daniel Potts\n");

	/* register a "power button" that we wait on when sleeping */	
	power_button();

	register_sysctl_table(pm_dir_table, 1);
	return 0;
}

__initcall(pm_init);


/* power_button(): BELONGS IN ANOTHER FILE: */
void power_button()
{
	int err;
	unsigned long flags;
	
	
	/* init interrupt section */
	PDDIR &= ~PD_IRQ3;
	PDSEL &= ~PD_IRQ3;
	
	ICR |= ( ICR_ET3); /* edge sensitive */
	ISR |= ISR_IRQ3; /* clear it */
	
	set_sleep_mask(IMR_MIRQ3);
	
	err = request_irq(IRQ3_IRQ_NUM, pm_irq,
			  IRQ_FLG_STD, "power button", NULL);
	
	if(err)
		printk("power irq failed\n");
}