/* 
 * File...........: linux/drivers/s390/block/dasd_3370_erp.c
 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000
 */

#include <linux/blkdev.h>
#include <asm/ccwcache.h>
#include <asm/dasd.h>

#ifdef PRINTK_HEADER
#undef PRINTK_HEADER
#define PRINTK_HEADER "dasd_erp(3370)"
#endif /* PRINTK_HEADER */

/*
 * DASD_3370_ERP_EXAMINE 
 *
 * DESCRIPTION
 *   Checks only for fatal/no/recover error. 
 *   A detailed examination of the sense data is done later outside
 *   the interrupt handler.
 *
 *   The logic is based on the 'IBM 3880 Storage Control Reference' manual
 *   'Chapter 7. 3370 Sense Data'.
 *
 * RETURN VALUES
 *   dasd_era_none      no error 
 *   dasd_era_fatal     for all fatal (unrecoverable errors)
 *   dasd_era_recover   for all others.
 */
dasd_era_t
dasd_3370_erp_examine (ccw_req_t * cqr, devstat_t * stat)
{
	char *sense = stat->ii.sense.data;

	/* check for successful execution first */
	if ( stat->cstat == 0x00 &&
             stat->dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))             
                return dasd_era_none;
        if ( sense[0] & 0x80 ) { /* CMD reject */
                return dasd_era_fatal;
        }
        if ( sense[0] & 0x40 ) { /* Drive offline */
                return dasd_era_recover;
        }
        if ( sense[0] & 0x20 ) { /* Bus out parity */
                return dasd_era_recover;
        }
        if ( sense[0] & 0x10 ) { /* equipment check */
                if ( sense[1] & 0x80 ) {
                        return dasd_era_fatal;
                }
                return dasd_era_recover;
        }
        if ( sense[0] & 0x08 ) { /* data check */
                if ( sense[1] & 0x80 ) {
                        return dasd_era_fatal;
                }
                return dasd_era_recover;
        }
        if ( sense[0] & 0x04 ) { /* overrun */
                if ( sense[1] & 0x80 ) {
                        return dasd_era_fatal;
                }
                return dasd_era_recover;
        }
        if ( sense[1] & 0x40 ) { /* invalid blocksize */
                return dasd_era_fatal;
        }
        if ( sense[1] & 0x04 ) { /* file protected */
                return dasd_era_recover;
        }
        if ( sense[1] & 0x01 ) { /* operation incomplete */
                return dasd_era_recover;
        }
        if ( sense[2] & 0x80 ) { /* check data erroor */
                return dasd_era_recover;
        }
        if ( sense[2] & 0x10 ) { /* Env. data present */
                return dasd_era_recover;
        }
        /* examine the 24 byte sense data */
        return dasd_era_recover;
        
}				/* END dasd_3370_erp_examine */

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-indent-level: 4 
 * c-brace-imaginary-offset: 0
 * c-brace-offset: -4
 * c-argdecl-indent: 4
 * c-label-offset: -4
 * c-continued-statement-offset: 4
 * c-continued-brace-offset: 0
 * indent-tabs-mode: nil
 * tab-width: 8
 * End:
 */
