/* 
 *    interfaces to log Chassis Codes via PDC (firmware)
 *
 *    Copyright (C) 2002 Laurent Canet <canetl@esiee.fr>
 *    Copyright (C) 2002-2004 Thibaut VARENE <varenet@parisc-linux.org>
 *
 *    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
 */

#undef PDC_CHASSIS_DEBUG
#ifdef PDC_CHASSIS_DEBUG
#define DPRINTK(fmt, args...)	printk(fmt, ## args)
#else
#define DPRINTK(fmt, args...)
#endif

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/notifier.h>
#include <linux/cache.h>

#include <asm/pdc_chassis.h>
#include <asm/processor.h>
#include <asm/pdc.h>
#include <asm/pdcpat.h>


#ifdef CONFIG_PDC_CHASSIS
static int pdc_chassis_old __read_mostly = 0;	
static unsigned int pdc_chassis_enabled __read_mostly = 1;


/**
 * pdc_chassis_setup() - Enable/disable pdc_chassis code at boot time.
 * @str configuration param: 0 to disable chassis log
 * @return 1
 */
 
static int __init pdc_chassis_setup(char *str)
{
	/*panic_timeout = simple_strtoul(str, NULL, 0);*/
	get_option(&str, &pdc_chassis_enabled);
	return 1;
}
__setup("pdcchassis=", pdc_chassis_setup);


/** 
 * pdc_chassis_checkold() - Checks for old PDC_CHASSIS compatibility
 * @pdc_chassis_old: 1 if old pdc chassis style
 * 
 * Currently, only E class and A180 are known to work with this.
 * Inspired by Christoph Plattner
 */

static void __init pdc_chassis_checkold(void)
{
	switch(CPU_HVERSION) {
		case 0x480:		/* E25 */
		case 0x481:		/* E35 */
		case 0x482:		/* E45 */
		case 0x483:		/* E55 */
		case 0x516:		/* A180 */
			pdc_chassis_old = 1;
			break;

		default:
			break;
	}
	DPRINTK(KERN_DEBUG "%s: pdc_chassis_checkold(); pdc_chassis_old = %d\n", __FILE__, pdc_chassis_old);
}


/**
 * pdc_chassis_panic_event() - Called by the panic handler.
 *
 * As soon as a panic occurs, we should inform the PDC.
 */

static int pdc_chassis_panic_event(struct notifier_block *this,
		        unsigned long event, void *ptr)
{
	pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
		return NOTIFY_DONE;
}   


static struct notifier_block pdc_chassis_panic_block = {
	.notifier_call = pdc_chassis_panic_event,
	.priority = INT_MAX,
};


/**
 * parisc_reboot_event() - Called by the reboot handler.
 *
 * As soon as a reboot occurs, we should inform the PDC.
 */

static int pdc_chassis_reboot_event(struct notifier_block *this,
		        unsigned long event, void *ptr)
{
	pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
		return NOTIFY_DONE;
}   


static struct notifier_block pdc_chassis_reboot_block = {
	.notifier_call = pdc_chassis_reboot_event,
	.priority = INT_MAX,
};
#endif /* CONFIG_PDC_CHASSIS */


/**
 * parisc_pdc_chassis_init() - Called at boot time.
 */

void __init parisc_pdc_chassis_init(void)
{
#ifdef CONFIG_PDC_CHASSIS
	int handle = 0;
	if (likely(pdc_chassis_enabled)) {
		DPRINTK(KERN_DEBUG "%s: parisc_pdc_chassis_init()\n", __FILE__);

		/* Let see if we have something to handle... */
		/* Check for PDC_PAT or old LED Panel */
		pdc_chassis_checkold();
		if (is_pdc_pat()) {
			printk(KERN_INFO "Enabling PDC_PAT chassis codes support.\n");
			handle = 1;
		}
		else if (unlikely(pdc_chassis_old)) {
			printk(KERN_INFO "Enabling old style chassis LED panel support.\n");
			handle = 1;
		}

		if (handle) {
			/* initialize panic notifier chain */
			notifier_chain_register(&panic_notifier_list, &pdc_chassis_panic_block);

			/* initialize reboot notifier chain */
			register_reboot_notifier(&pdc_chassis_reboot_block);
		}
	}
#endif /* CONFIG_PDC_CHASSIS */
}


/** 
 * pdc_chassis_send_status() - Sends a predefined message to the chassis,
 * and changes the front panel LEDs according to the new system state
 * @retval: PDC call return value.
 *
 * Only machines with 64 bits PDC PAT and those reported in
 * pdc_chassis_checkold() are supported atm.
 * 
 * returns 0 if no error, -1 if no supported PDC is present or invalid message,
 * else returns the appropriate PDC error code.
 * 
 * For a list of predefined messages, see asm-parisc/pdc_chassis.h
 */

int pdc_chassis_send_status(int message)
{
	/* Maybe we should do that in an other way ? */
	int retval = 0;
#ifdef CONFIG_PDC_CHASSIS
	if (likely(pdc_chassis_enabled)) {

		DPRINTK(KERN_DEBUG "%s: pdc_chassis_send_status(%d)\n", __FILE__, message);

#ifdef CONFIG_64BIT
		if (is_pdc_pat()) {
			switch(message) {
				case PDC_CHASSIS_DIRECT_BSTART:
					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BSTART, PDC_CHASSIS_LSTATE_RUN_NORMAL);
					break;

				case PDC_CHASSIS_DIRECT_BCOMPLETE:
					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BCOMPLETE, PDC_CHASSIS_LSTATE_RUN_NORMAL);
					break;

				case PDC_CHASSIS_DIRECT_SHUTDOWN:
					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_SHUTDOWN, PDC_CHASSIS_LSTATE_NONOS);
					break;

				case PDC_CHASSIS_DIRECT_PANIC:
					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_PANIC, PDC_CHASSIS_LSTATE_RUN_CRASHREC);
					break;

				case PDC_CHASSIS_DIRECT_LPMC:
					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_LPMC, PDC_CHASSIS_LSTATE_RUN_SYSINT);
					break;

				case PDC_CHASSIS_DIRECT_HPMC:
					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_HPMC, PDC_CHASSIS_LSTATE_RUN_NCRIT);
					break;

				default:
					retval = -1;
			}
		} else retval = -1;
#else
		if (unlikely(pdc_chassis_old)) {
			switch (message) {
				case PDC_CHASSIS_DIRECT_BSTART:
				case PDC_CHASSIS_DIRECT_BCOMPLETE:
					retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_RUN));
					break;

				case PDC_CHASSIS_DIRECT_SHUTDOWN:
					retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_SHUT));
					break;

				case PDC_CHASSIS_DIRECT_HPMC:
				case PDC_CHASSIS_DIRECT_PANIC:
					retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_FLT));
					break;

				case PDC_CHASSIS_DIRECT_LPMC:
					retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_WARN));
					break;

				default:
					retval = -1;
			}
		} else retval = -1;
#endif /* CONFIG_64BIT */
	}	/* if (pdc_chassis_enabled) */
#endif /* CONFIG_PDC_CHASSIS */
	return retval;
}