/* 
 * File...........: linux/drivers/s390/block/dasd_eckd.c
 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000

 * History of changes (starts July 2000)
 * 07/11/00 Enabled rotational position sensing
 * 07/14/00 Reorganized the format process for better ERP
 * 07/20/00 added experimental support for 2105 control unit (ESS)
 * 07/24/00 increased expiration time and added the missing zero
 * 08/07/00 added some bits to define_extent for ESS support
 * 09/20/00 added reserve and release ioctls
 * 10/04/00 changed RW-CCWS to R/W Key and Data
 * 10/10/00 reverted last change according to ESS exploitation
 * 10/10/00 now dequeuing init_cqr before freeing *ouch*
 * 26/10/00 fixed ITPM20144ASC (problems when accesing a device formatted by VIF)
 */

#include <linux/config.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <asm/debug.h>

#include <linux/malloc.h>
#include <linux/hdreg.h>	/* HDIO_GETGEO                      */
#include <linux/blk.h>
#include <asm/ccwcache.h>
#include <asm/idals.h>
#include <asm/dasd.h>

#include <asm/ebcdic.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/s390dyn.h>

#include "dasd_eckd.h"

#ifdef PRINTK_HEADER
#undef PRINTK_HEADER
#endif				/* PRINTK_HEADER */
#define PRINTK_HEADER DASD_NAME"(eckd): "

#define ECKD_C0(i) (i->home_bytes)
#define ECKD_F(i) (i->formula)
#define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):(i->factors.f_0x02.f1))
#define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):(i->factors.f_0x02.f2))
#define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):(i->factors.f_0x02.f3))
#define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
#define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
#define ECKD_F6(i) (i->factor6)
#define ECKD_F7(i) (i->factor7)
#define ECKD_F8(i) (i->factor8)

#define DASD_ECKD_CCW_WRITE 0x05
#define DASD_ECKD_CCW_READ 0x06
#define DASD_ECKD_CCW_WRITE_HOME_ADDRESS 0x09
#define DASD_ECKD_CCW_READ_HOME_ADDRESS 0x0a
#define DASD_ECKD_CCW_WRITE_KD 0x0d
#define DASD_ECKD_CCW_READ_KD 0x0e
#define DASD_ECKD_CCW_READ_COUNT 0x12
#define DASD_ECKD_CCW_WRITE_RECORD_ZERO 0x15
#define DASD_ECKD_CCW_READ_RECORD_ZERO 0x16
#define DASD_ECKD_CCW_WRITE_CKD 0x1d
#define DASD_ECKD_CCW_READ_CKD 0x1e
#define DASD_ECKD_CCW_LOCATE_RECORD 0x47
#define DASD_ECKD_CCW_DEFINE_EXTENT 0x63
#define DASD_ECKD_CCW_WRITE_MT 0x85
#define DASD_ECKD_CCW_READ_MT 0x86
#define DASD_ECKD_CCW_WRITE_KD_MT 0x8d
#define DASD_ECKD_CCW_READ_KD_MT 0x8e
#define DASD_ECKD_CCW_RELEASE 0x94
#define DASD_ECKD_CCW_READ_CKD_MT 0x9e
#define DASD_ECKD_CCW_WRITE_CKD_MT 0x9d
#define DASD_ECKD_CCW_RESERVE 0xB4

dasd_discipline_t dasd_eckd_discipline;

typedef struct
dasd_eckd_private_t {
	dasd_eckd_characteristics_t rdc_data;
	dasd_eckd_confdata_t conf_data;
	eckd_count_t count_area;
	ccw_req_t *init_cqr;
} dasd_eckd_private_t;

#ifdef CONFIG_DASD_DYNAMIC
static
devreg_t dasd_eckd_known_devices[] =
{
	{
		ci:
		{hc:
		 {ctype:0x3990, dtype:0x3390}},
		flag:DEVREG_MATCH_CU_TYPE | DEVREG_MATCH_DEV_TYPE,
		oper_func:dasd_oper_handler
	},
	{
		ci:
		{hc:
		 {ctype:0x3990, dtype:0x3380}},
		flag:DEVREG_MATCH_CU_TYPE | DEVREG_MATCH_DEV_TYPE,
		oper_func:dasd_oper_handler
	},
	{
		ci:
		{hc:
		 {ctype:0x9343, dtype:0x9345}},
		flag:DEVREG_MATCH_CU_TYPE | DEVREG_MATCH_DEV_TYPE,
		oper_func:dasd_oper_handler
	}
};
#endif

static inline unsigned int
round_up_multiple (unsigned int no, unsigned int mult)
{
	int rem = no % mult;
	return (rem ? no - rem + mult : no);
}

static inline unsigned int
ceil_quot (unsigned int d1, unsigned int d2)
{
	return (d1 + (d2 - 1)) / d2;
}

static inline int
bytes_per_record (dasd_eckd_characteristics_t * rdc,
		  int kl,	/* key length */
		  int dl /* data length */ )
{
	int bpr = 0;
	switch (rdc->formula) {
	case 0x01:{
			unsigned int fl1, fl2;
			fl1 = round_up_multiple (ECKD_F2 (rdc) + dl,
						 ECKD_F1 (rdc));
			fl2 = round_up_multiple (kl ? ECKD_F2 (rdc) + kl : 0,
						 ECKD_F1 (rdc));
			bpr = fl1 + fl2;
			break;
		}
	case 0x02:{
			unsigned int fl1, fl2, int1, int2;
			int1 = ceil_quot (dl + ECKD_F6 (rdc),
					  ECKD_F5 (rdc) << 1);
			int2 = ceil_quot (kl + ECKD_F6 (rdc),
					  ECKD_F5 (rdc) << 1);
			fl1 = round_up_multiple (ECKD_F1 (rdc) *
						 ECKD_F2 (rdc) +
						 (dl + ECKD_F6 (rdc) +
						  ECKD_F4 (rdc) * int1),
						 ECKD_F1 (rdc));
			fl2 = round_up_multiple (ECKD_F1 (rdc) *
						 ECKD_F3 (rdc) +
						 (kl + ECKD_F6 (rdc) +
						  ECKD_F4 (rdc) * int2),
						 ECKD_F1 (rdc));
			bpr = fl1 + fl2;
			break;
		}
	default:
		INTERNAL_ERROR ("unknown formula%d\n", rdc->formula);
	}
	return bpr;
}

static inline unsigned int
bytes_per_track (dasd_eckd_characteristics_t * rdc)
{
	return *(unsigned int *) (rdc->byte_per_track) >> 8;
}

static inline unsigned int
recs_per_track (dasd_eckd_characteristics_t * rdc,
		unsigned int kl, unsigned int dl)
{
	int rpt = 0;
	int dn;
	switch (rdc->dev_type) {
	case 0x3380:
		if (kl)
			return 1499 / (15 +
				       7 + ceil_quot (kl + 12, 32) +
				       ceil_quot (dl + 12, 32));
		else
			return 1499 / (15 + ceil_quot (dl + 12, 32));
	case 0x3390:
		dn = ceil_quot (dl + 6, 232) + 1;
		if (kl) {
			int kn = ceil_quot (kl + 6, 232) + 1;
			return 1729 / (10 +
				       9 + ceil_quot (kl + 6 * kn, 34) +
				       9 + ceil_quot (dl + 6 * dn, 34));
		} else
			return 1729 / (10 +
				       9 + ceil_quot (dl + 6 * dn, 34));
	case 0x9345:
		dn = ceil_quot (dl + 6, 232) + 1;
		if (kl) {
			int kn = ceil_quot (kl + 6, 232) + 1;
			return 1420 / (18 +
				       7 + ceil_quot (kl + 6 * kn, 34) +
				       ceil_quot (dl + 6 * dn, 34));
		} else
			return 1420 / (18 +
				       7 + ceil_quot (dl + 6 * dn, 34));
	}
	return rpt;
}

static inline void
define_extent (ccw1_t * de_ccw,
	       DE_eckd_data_t * data,
	       int trk,
	       int totrk,
	       int cmd,
	       dasd_device_t * device)
{
	ch_t geo, beg, end;
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;

	geo.cyl = private->rdc_data.no_cyl;
	geo.head = private->rdc_data.trk_per_cyl;
	beg.cyl = trk / geo.head;
	beg.head = trk % geo.head;
	end.cyl = totrk / geo.head;
	end.head = totrk % geo.head;

	memset (de_ccw, 0, sizeof (ccw1_t));
	de_ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
	de_ccw->count = 16;
	set_normalized_cda (de_ccw, __pa (data));

	memset (data, 0, sizeof (DE_eckd_data_t));
	switch (cmd) {
	case DASD_ECKD_CCW_READ_HOME_ADDRESS:
	case DASD_ECKD_CCW_READ_RECORD_ZERO:
	case DASD_ECKD_CCW_READ:
	case DASD_ECKD_CCW_READ_MT:
	case DASD_ECKD_CCW_READ_CKD:	/* Fallthrough */
	case DASD_ECKD_CCW_READ_CKD_MT:
	case DASD_ECKD_CCW_READ_KD:
	case DASD_ECKD_CCW_READ_KD_MT:
	case DASD_ECKD_CCW_READ_COUNT:
		data->mask.perm = 0x1;
		data->attributes.operation = 0x3;	/* enable seq. caching */
		break;
	case DASD_ECKD_CCW_WRITE:
	case DASD_ECKD_CCW_WRITE_MT:
	case DASD_ECKD_CCW_WRITE_KD:
	case DASD_ECKD_CCW_WRITE_KD_MT:
		data->mask.perm = 0x02;
		data->attributes.operation = 0x3;	/* enable seq. caching */
		break;
	case DASD_ECKD_CCW_WRITE_CKD:
	case DASD_ECKD_CCW_WRITE_CKD_MT:
		data->attributes.operation = 0x1;	/* format through cache */
		break;
	case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
	case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
		data->mask.perm = 0x3;
		data->mask.auth = 0x1;
		data->attributes.operation = 0x1;	/* format through cache */
		break;
	default:
		INTERNAL_ERROR ("unknown opcode 0x%x\n", cmd);
		break;
	}
	data->attributes.mode = 0x3;
	if (private->rdc_data.cu_type == 0x2105) {
		data->reserved |= 0x40;
	}
	data->beg_ext.cyl = beg.cyl;
	data->beg_ext.head = beg.head;
	data->end_ext.cyl = end.cyl;
	data->end_ext.head = end.head;
}

static inline void
locate_record (ccw1_t * lo_ccw,
	       LO_eckd_data_t * data,
	       int trk,
	       int rec_on_trk,
	       int no_rec,
	       int cmd,
	       dasd_device_t * device,
	       int reclen)
{
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;
	ch_t geo =
	{private->rdc_data.no_cyl,
	 private->rdc_data.trk_per_cyl};
	ch_t seek =
	{trk / (geo.head), trk % (geo.head)};
	int sector;

	memset (lo_ccw, 0, sizeof (ccw1_t));
	lo_ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
	lo_ccw->count = 16;
	set_normalized_cda (lo_ccw, __pa (data));

	memset (data, 0, sizeof (LO_eckd_data_t));
	switch (cmd) {
	case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
		data->operation.orientation = 0x3;
		data->operation.operation = 0x03;
		break;
	case DASD_ECKD_CCW_READ_HOME_ADDRESS:
		data->operation.orientation = 0x3;
		data->operation.operation = 0x16;
		break;
	case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
		data->operation.orientation = 0x1;
		data->operation.operation = 0x03;
		data->count++;
		break;
	case DASD_ECKD_CCW_READ_RECORD_ZERO:
		data->operation.orientation = 0x3;
		data->operation.operation = 0x16;
		data->count++;
		break;
	case DASD_ECKD_CCW_WRITE:
	case DASD_ECKD_CCW_WRITE_MT:
	case DASD_ECKD_CCW_WRITE_KD:
	case DASD_ECKD_CCW_WRITE_KD_MT:
		data->auxiliary.last_bytes_used = 0x1;
		data->length = reclen;
		data->operation.operation = 0x01;
		break;
	case DASD_ECKD_CCW_WRITE_CKD:
	case DASD_ECKD_CCW_WRITE_CKD_MT:
		data->auxiliary.last_bytes_used = 0x1;
		data->length = reclen;
		data->operation.operation = 0x03;
		break;
	case DASD_ECKD_CCW_READ:
	case DASD_ECKD_CCW_READ_MT:
	case DASD_ECKD_CCW_READ_KD:
	case DASD_ECKD_CCW_READ_KD_MT:
		data->auxiliary.last_bytes_used = 0x1;
		data->length = reclen;
		data->operation.operation = 0x06;
		break;
	case DASD_ECKD_CCW_READ_CKD:
	case DASD_ECKD_CCW_READ_CKD_MT:
		data->auxiliary.last_bytes_used = 0x1;
		data->length = reclen;
		data->operation.operation = 0x16;
		break;
	case DASD_ECKD_CCW_READ_COUNT:
		data->operation.operation = 0x06;
		break;
	default:
		INTERNAL_ERROR ("unknown opcode 0x%x\n", cmd);
	}
	switch (private->rdc_data.dev_type) {
	case 0x3390:{
			int dn, d;
			dn = ceil_quot (reclen + 6, 232);
			d = 9 + ceil_quot (reclen + 6 * (dn + 1), 34);
			sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
			break;
		}
	case 0x3380:{
			int d;
			d = 7 + ceil_quot (reclen + 12, 32);
			sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
			break;
		}
	case 0x9345:
	default:
		sector = 0;
	}
	data->sector = sector;
	memcpy (&(data->seek_addr), &seek, sizeof (ch_t));
	memcpy (&(data->search_arg), &seek, sizeof (ch_t));
	data->search_arg.record = rec_on_trk;
	data->count += no_rec;
}

static int
dasd_eckd_id_check (s390_dev_info_t * info)
{
	if (info->sid_data.cu_type == 0x3990 ||
	    info->sid_data.cu_type == 0x2105)
		if (info->sid_data.dev_type == 0x3390)
			return 0;
	if (info->sid_data.cu_type == 0x3990 ||
	    info->sid_data.cu_type == 0x2105)
		if (info->sid_data.dev_type == 0x3380)
			return 0;
	if (info->sid_data.cu_type == 0x9343)
		if (info->sid_data.dev_type == 0x9345)
			return 0;
	return -ENODEV;
}

static int
dasd_eckd_check_characteristics (struct dasd_device_t *device)
{
	int rc = -ENODEV;
	void *conf_data;
	void *rdc_data;
	int conf_len;
	dasd_eckd_private_t *private;

	if (device == NULL) {
		printk (KERN_WARNING PRINTK_HEADER
		   "Null device pointer passed to characteristics checker\n");
		return -ENODEV;
	}
        if (device->private == NULL) {
                device->private = kmalloc (sizeof (dasd_eckd_private_t), GFP_KERNEL);
                if (device->private == NULL) {
                        printk (KERN_WARNING PRINTK_HEADER
                                "memory allocation failed for private data\n");
                        return -ENOMEM;
                }
        }
	private = (dasd_eckd_private_t *) device->private;
	rdc_data = (void *) &(private->rdc_data);
	rc = read_dev_chars (device->devinfo.irq, &rdc_data, 64);
	if (rc) {
		printk (KERN_WARNING PRINTK_HEADER
			"Read device characteristics returned error %d\n", rc);
		return rc;
	}
	printk (KERN_INFO PRINTK_HEADER
	    "%04X on sch %d: %04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d\n",
		device->devinfo.devno, device->devinfo.irq,
		private->rdc_data.dev_type, private->rdc_data.dev_model,
		private->rdc_data.cu_type, private->rdc_data.cu_model.model,
		private->rdc_data.no_cyl, private->rdc_data.trk_per_cyl,
		private->rdc_data.sec_per_trk);
	rc = 0 ? 0 : read_conf_data (device->devinfo.irq, &conf_data, &conf_len, LPM_ANYPATH);
	if (rc) {
		if (rc == -EOPNOTSUPP)
			return 0;
		printk (KERN_WARNING PRINTK_HEADER
			"Read configuration data returned error %d\n", rc);
		return rc;
	}
	if (conf_len != sizeof (dasd_eckd_confdata_t)) {
		printk (KERN_WARNING PRINTK_HEADER
			"sizes of configuration data mismatch %d (read) vs %ld (expected)\n",
			conf_len, sizeof (dasd_eckd_confdata_t));
		return rc;
	}
	if (conf_data == NULL) {
		printk (KERN_WARNING PRINTK_HEADER
			"No configuration data retrieved\n");
		return -ENOMEM;
	}
	memcpy (&private->conf_data, conf_data, sizeof (dasd_eckd_confdata_t));
	printk (KERN_INFO PRINTK_HEADER
                "%04X on sch %d: %04X/%02X(CU:%04X/%02X): Configuration data read\n",
		device->devinfo.devno, device->devinfo.irq,
		private->rdc_data.dev_type, private->rdc_data.dev_model,
		private->rdc_data.cu_type, private->rdc_data.cu_model.model);
	device->sizes.bp_block = 4096;
	device->sizes.s2b_shift = 3;
	device->sizes.blocks = (private->rdc_data.no_cyl *
				private->rdc_data.trk_per_cyl *
				recs_per_track (&private->rdc_data,
						0, device->sizes.bp_block));
	return 0;
}

static ccw_req_t *
dasd_eckd_init_analysis (struct dasd_device_t *device)
{
	ccw_req_t *cqr = NULL;
	ccw1_t *ccw;
	DE_eckd_data_t *DE_data;
	LO_eckd_data_t *LO_data;
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;
	eckd_count_t *count_data = &(private->count_area);

	cqr = ccw_alloc_request (dasd_eckd_discipline.name, 3 + 1, sizeof (DE_eckd_data_t) + sizeof (LO_eckd_data_t));
	if (cqr == NULL) {
		printk (KERN_WARNING PRINTK_HEADER
			"No memory to allocate initialization request\n");
		return NULL;
	} else {
		private->init_cqr = cqr;
	}
	DE_data = cqr->data;
	LO_data = cqr->data + sizeof (DE_eckd_data_t);
	ccw = cqr->cpaddr;
	define_extent (ccw, DE_data, 0, 0, DASD_ECKD_CCW_READ_COUNT, device);
	ccw->flags |= CCW_FLAG_CC;
	ccw++;
	locate_record (ccw, LO_data, 0, 0, 1, DASD_ECKD_CCW_READ_COUNT, device, 0);
	ccw->flags |= CCW_FLAG_CC;
	ccw++;
	ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
	ccw->count = 8;
	set_normalized_cda (ccw, __pa (count_data));
	cqr->device = device;
	cqr->retries = 0;
	cqr->status = CQR_STATUS_FILLED;

	return cqr;
}

static int
dasd_eckd_do_analysis (struct dasd_device_t *device)
{
	int rc = 0;
	int sb, rpt;
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;
	int bs = private->count_area.dl;

	dasd_chanq_deq (&device->queue, private->init_cqr);
	ccw_free_request (private->init_cqr);
	private->init_cqr = NULL;
	memset (&(device->sizes), 0, sizeof (dasd_sizes_t));
	switch (bs) {
	case 512:
	case 1024:
	case 2048:
	case 4096:
		device->sizes.bp_block = bs;
		break;
	default:
		printk (KERN_INFO PRINTK_HEADER
			"/dev/%s (%04X): invalid blocksize %d\n"
			KERN_INFO PRINTK_HEADER
		 "/dev/%s (%04X): capacity (at 4kB blks): %dkB at %dkB/trk\n",
			device->name, device->devinfo.devno, bs,
			device->name, device->devinfo.devno,
		   (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl *
		    recs_per_track (&private->rdc_data, 0, 4096)),
			recs_per_track (&private->rdc_data, 0, 4096));
		return -EMEDIUMTYPE;
	}
	device->sizes.s2b_shift = 0;	/* bits to shift 512 to get a block */
	for (sb = 512; sb < bs; sb = sb << 1)
		device->sizes.s2b_shift++;

	rpt = recs_per_track (&private->rdc_data, 0, device->sizes.bp_block);
	device->sizes.blocks = (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl *
	      recs_per_track (&private->rdc_data, 0, device->sizes.bp_block));

	printk (KERN_INFO PRINTK_HEADER
		"/dev/%s (%04X): capacity (%dkB blks): %dkB at %dkB/trk\n",
		device->name, device->devinfo.devno,
		(device->sizes.bp_block >> 10),
		(private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl *
	      recs_per_track (&private->rdc_data, 0, device->sizes.bp_block) *
		 (device->sizes.bp_block >> 9)) >> 1,
		(recs_per_track (&private->rdc_data, 0, device->sizes.bp_block) * device->sizes.bp_block) >> 10);
	return 0;

	return rc;
}

static int
dasd_eckd_fill_geometry (struct dasd_device_t *device, struct hd_geometry *geo)
{
	int rc = 0;
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;
	switch (device->sizes.bp_block) {
	case 512:
	case 1024:
	case 2048:
	case 4096:
		break;
	default:
		return -EINVAL;
	}
	geo->cylinders = private->rdc_data.no_cyl;
	geo->heads = private->rdc_data.trk_per_cyl;
	geo->sectors = recs_per_track (&(private->rdc_data), 0, device->sizes.bp_block);
	geo->start = 2;
	return rc;
}

static ccw_req_t *
dasd_eckd_format_device (dasd_device_t * device, format_data_t * fdata)
{
	int i;
	ccw_req_t *fcp = NULL;
	DE_eckd_data_t *DE_data = NULL;
	LO_eckd_data_t *LO_data = NULL;
	eckd_count_t *ct_data = NULL;
	eckd_count_t *r0_data = NULL;
	eckd_home_t *ha_data = NULL;
	ccw1_t *last_ccw = NULL;
	void *last_data = NULL;
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;
	int trk = fdata->start_unit;
	int bs = fdata->blksize == DASD_FORMAT_DEFAULT_BLOCKSIZE ? 4096 : fdata->blksize;
	int flags = fdata->intensity == DASD_FORMAT_DEFAULT_INTENSITY ? 0 : fdata->intensity;

	int rpt = recs_per_track (&(private->rdc_data), 0, bs);
	int cyl = trk / private->rdc_data.trk_per_cyl;
	int head = trk % private->rdc_data.trk_per_cyl;
	int wrccws = rpt;
	int datasize = sizeof (DE_eckd_data_t) + sizeof (LO_eckd_data_t);

	if (((fdata->stop_unit == DASD_FORMAT_DEFAULT_STOP_UNIT) &&
	 trk >= (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) ||
	    ((fdata->stop_unit != DASD_FORMAT_DEFAULT_STOP_UNIT) &&
	     trk > fdata->stop_unit)) {
		DASD_MESSAGE(KERN_INFO, device,"Track %d reached! ending.", trk);
		return NULL;
	}
	switch (bs) {
	case 512:
	case 1024:
	case 2048:
	case 4096:
		break;
	default:
		printk (KERN_WARNING PRINTK_HEADER "Invalid blocksize %d...terminating!\n", bs);
		return NULL;
	}
	switch (flags) {
	case 0x00:
	case 0x01:
	case 0x03:
	case 0x04:		/* make track invalid */
		break;
	default:
		printk (KERN_WARNING PRINTK_HEADER "Invalid flags 0x%x...terminating!\n", flags);
		return NULL;
	}

	/* print status line */
	if ((private->rdc_data.no_cyl < 20) ?
	    (trk % private->rdc_data.no_cyl == 0) :
	    (trk % private->rdc_data.no_cyl == 0 &&
	     (trk / private->rdc_data.no_cyl) %
	     (private->rdc_data.no_cyl / 20))) {
		DASD_MESSAGE(KERN_INFO, device, "Format Cylinder: %d Flags: %d\n",
			trk / private->rdc_data.trk_per_cyl,
			flags);
	}
	if (flags & 0x04) {
                rpt = 1;
		wrccws = 1;
                bs = 8;
	} else {
		if (flags & 0x1) {
			wrccws++;
			datasize += sizeof (eckd_count_t);
		}
		if (flags & 0x2) {
			wrccws++;
			datasize += sizeof (eckd_home_t);
		}
	}
	fcp = ccw_alloc_request (dasd_eckd_discipline.name,
				 wrccws + 2 + 1,
				 datasize + rpt * sizeof (eckd_count_t));
	if (fcp != NULL) {
		fcp->device = device;
                fcp->retries = 2;       /* set retry counter to enable ERP */
		last_data = fcp->data;
		DE_data = (DE_eckd_data_t *) last_data;
		last_data = (void *) (DE_data + 1);
		LO_data = (LO_eckd_data_t *) last_data;
		last_data = (void *) (LO_data + 1);
		if (flags & 0x2) {
			ha_data = (eckd_home_t *) last_data;
			last_data = (void *) (ha_data + 1);
		}
		if (flags & 0x1) {
			r0_data = (eckd_count_t *) last_data;
			last_data = (void *) (r0_data + 1);
		}
		ct_data = (eckd_count_t *) last_data;

		last_ccw = fcp->cpaddr;

		switch (flags) {
		case 0x03:
			define_extent (last_ccw, DE_data, trk, trk,
				    DASD_ECKD_CCW_WRITE_HOME_ADDRESS, device);
			last_ccw->flags |= CCW_FLAG_CC;
			last_ccw++;
			locate_record (last_ccw, LO_data, trk, 0, wrccws,
				       DASD_ECKD_CCW_WRITE_HOME_ADDRESS, device, device->sizes.bp_block);
			last_ccw->flags |= CCW_FLAG_CC;
			last_ccw++;
			break;
		case 0x01:
			define_extent (last_ccw, DE_data, trk, trk,
				     DASD_ECKD_CCW_WRITE_RECORD_ZERO, device);
			last_ccw->flags |= CCW_FLAG_CC;
			last_ccw++;
			locate_record (last_ccw, LO_data, trk, 0, wrccws,
				       DASD_ECKD_CCW_WRITE_RECORD_ZERO, device, device->sizes.bp_block);
			last_ccw->flags |= CCW_FLAG_CC;
			last_ccw++;
			memset (r0_data, 0, sizeof (eckd_count_t));
			break;
		case 0x00:
			define_extent (last_ccw, DE_data, trk, trk,
				       DASD_ECKD_CCW_WRITE_CKD, device);
			last_ccw->flags |= CCW_FLAG_CC;
			last_ccw++;
			locate_record (last_ccw, LO_data, trk, 0, wrccws,
				       DASD_ECKD_CCW_WRITE_CKD, device, device->sizes.bp_block);
			LO_data->length = bs;
			last_ccw->flags |= CCW_FLAG_CC;
			last_ccw++;
			break;
		case 0x04:
			define_extent (last_ccw, DE_data, trk, trk,
				       DASD_ECKD_CCW_WRITE_CKD, device);
			last_ccw->flags |= CCW_FLAG_CC;
			last_ccw++;
			locate_record (last_ccw, LO_data, trk, 0, wrccws,
				       DASD_ECKD_CCW_WRITE_CKD, device, 0);
			LO_data->length = bs;
			last_ccw->flags |= CCW_FLAG_CC;
			last_ccw++;
			break;
		default:
			PRINT_WARN ("Unknown format flags...%d\n", flags);
			return NULL;
		}
		if (flags & 0x02) {
			PRINT_WARN ("Unsupported format flag...%d\n", flags);
			return NULL;
		}
		if (flags & 0x01) {	/* write record zero */
			r0_data->cyl = cyl;
			r0_data->head = head;
			r0_data->record = 0;
			r0_data->kl = 0;
			r0_data->dl = 8;
			last_ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
			last_ccw->count = 8;
			last_ccw->flags |= CCW_FLAG_CC | CCW_FLAG_SLI;
			set_normalized_cda (last_ccw, __pa (r0_data));
			last_ccw++;
		}
		/* write remaining records */
		for (i = 0; i < rpt; i++) {
			memset (ct_data + i, 0, sizeof (eckd_count_t));
			(ct_data + i)->cyl = cyl;
			(ct_data + i)->head = head;
			(ct_data + i)->record = i + 1;
			(ct_data + i)->kl = 0;
			(ct_data + i)->dl = bs;
			last_ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
			last_ccw->flags |= CCW_FLAG_CC | CCW_FLAG_SLI;
			last_ccw->count = 8;
			set_normalized_cda (last_ccw, __pa (ct_data + i));
			last_ccw++;
		}
		(last_ccw - 1)->flags &= ~(CCW_FLAG_CC | CCW_FLAG_DC);
		fcp->device = device;
		fcp->status = CQR_STATUS_FILLED;
	}
	return fcp;
}

static dasd_era_t
dasd_eckd_examine_error (ccw_req_t * cqr, devstat_t * stat)
{
	dasd_device_t *device = (dasd_device_t *) cqr->device;

	if (stat->cstat == 0x00 &&
	    stat->dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
		return dasd_era_none;

	switch (device->devinfo.sid_data.cu_type) {
	case 0x3990:
	case 0x2105:
		return dasd_3990_erp_examine (cqr, stat);
	case 0x9343:
		return dasd_9343_erp_examine (cqr, stat);
	default:
		printk (KERN_WARNING PRINTK_HEADER
			"default (unknown CU type) - RECOVERABLE return \n");
		return dasd_era_recover;
	}
}

static dasd_erp_action_fn_t
dasd_eckd_erp_action (ccw_req_t * cqr)
{
	dasd_device_t *device = (dasd_device_t *) cqr->device;
        
	switch (device->devinfo.sid_data.cu_type) {
	case 0x3990:
	case 0x2105:
                /*  return dasd_3990_erp_action; */
	case 0x9343:
                /* Return dasd_9343_erp_action; */
	default:
		return default_erp_action;
	}
}

static dasd_erp_postaction_fn_t
dasd_eckd_erp_postaction (ccw_req_t * cqr)
{
	if (cqr->function != default_erp_action)
                printk (KERN_WARNING PRINTK_HEADER
                        "unknown ERP action [<%p>]\n",
                        cqr->function);
	return default_erp_postaction;
}

static ccw_req_t *
dasd_eckd_build_cp_from_req (dasd_device_t * device, struct request *req)
{
	ccw_req_t *rw_cp = NULL;
	int rw_cmd;
	int bhct;
	long size;
	ccw1_t *ccw;
	DE_eckd_data_t *DE_data;
	LO_eckd_data_t *LO_data;
	struct buffer_head *bh;
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;
	int byt_per_blk = device->sizes.bp_block;
	int shift = device->sizes.s2b_shift;
	int blk_per_trk = recs_per_track (&(private->rdc_data), 0, byt_per_blk);
	int btrk = (req->sector >> shift) / blk_per_trk;
	int etrk = ((req->sector + req->nr_sectors - 1) >> shift) / blk_per_trk;

	if (req->cmd == READ) {
		rw_cmd = DASD_ECKD_CCW_READ_MT;
	} else if (req->cmd == WRITE) {
		rw_cmd = DASD_ECKD_CCW_WRITE_MT;
	} else {
		PRINT_ERR ("Unknown command %d\n", req->cmd);
		return NULL;
	}
	/* Build the request */
	/* count bhs to prevent errors, when bh smaller than block */
	bhct = 0;
	for (bh = req->bh; bh; bh = bh->b_reqnext) {
		if (bh->b_size > byt_per_blk)
			for (size = 0; size < bh->b_size; size += byt_per_blk)
				bhct++;
		else
			bhct++;
	}

	rw_cp = dasd_alloc_request (dasd_eckd_discipline.name,
				    2 + bhct + 1,
				    sizeof (DE_eckd_data_t) +
				    sizeof (LO_eckd_data_t));
	if (!rw_cp) {
		return NULL;
	}
	DE_data = rw_cp->data;
	LO_data = rw_cp->data + sizeof (DE_eckd_data_t);
	ccw = rw_cp->cpaddr;

	define_extent (ccw, DE_data, btrk, etrk, rw_cmd, device);
	ccw->flags |= CCW_FLAG_CC;
	ccw++;
	locate_record (ccw, LO_data, btrk, (req->sector >> shift) % blk_per_trk + 1,
	    req->nr_sectors >> shift, rw_cmd, device, device->sizes.bp_block);
	ccw->flags |= CCW_FLAG_CC;
	for (bh = req->bh; bh != NULL;) {
		if (bh->b_size > byt_per_blk) {
			for (size = 0; size < bh->b_size; size += byt_per_blk) {
				ccw++;
				ccw->flags |= CCW_FLAG_CC;
				ccw->cmd_code = rw_cmd;
				ccw->count = byt_per_blk;
				set_normalized_cda (ccw, __pa (bh->b_data + size));
			}
			bh = bh->b_reqnext;
		} else {	/* group N bhs to fit into byt_per_blk */
			for (size = 0; bh != NULL && size < byt_per_blk;) {
				ccw++;
				ccw->flags |= CCW_FLAG_DC;
				ccw->cmd_code = rw_cmd;
				ccw->count = bh->b_size;
				set_normalized_cda (ccw, __pa (bh->b_data));
				size += bh->b_size;
				bh = bh->b_reqnext;
			}
			if (size != byt_per_blk) {
				PRINT_WARN ("Cannot fulfill small request %ld vs. %d (%ld sects)\n",
					    size,
					    byt_per_blk,
					    req->nr_sectors);

				ccw_free_request (rw_cp);
				return NULL;
			}
			ccw->flags &= ~CCW_FLAG_DC;
			ccw->flags |= CCW_FLAG_CC;
		}
	}
	ccw->flags &= ~(CCW_FLAG_DC | CCW_FLAG_CC);
	rw_cp->device = device;
	rw_cp->expires = 5 * TOD_MIN;	/* 5 minutes */
	rw_cp->req = req;
	rw_cp->lpm = LPM_ANYPATH;
	rw_cp->retries = 2;
	asm volatile ("STCK %0":"=m" (rw_cp->buildclk));
	check_then_set (&rw_cp->status,
				       CQR_STATUS_EMPTY,
				       CQR_STATUS_FILLED);
	return rw_cp;
}
#if 0
int
dasd_eckd_cleanup_request (ccw_req_t * cqr)
{
	int ret = 0;
	struct request *req = cqr->req;
	dasd_device_t *device = cqr->device;
	int byt_per_blk = device->sizes.bp_block;

	for (bh = req->bh; bh != NULL;) {
		if (bh->b_size > byt_per_blk) {
			for (size = 0; size < bh->b_size; size += byt_per_blk) {
				ccw++;
				ccw->flags |= CCW_FLAG_CC;
				ccw->cmd_code = rw_cmd;
				ccw->count = byt_per_blk;
				set_normalized_cda (ccw, __pa (bh->b_data + size));
			}
			bh = bh->b_reqnext;
		} else {	/* group N bhs to fit into byt_per_blk */
			for (size = 0; bh != NULL && size < byt_per_blk;) {
				ccw++;
				ccw->flags |= CCW_FLAG_DC;
				ccw->cmd_code = rw_cmd;
				ccw->count = bh->b_size;
				set_normalized_cda (ccw, __pa (bh->b_data));
				size += bh->b_size;
				bh = bh->b_reqnext;
			}
		}
	}
	return ret;
}
#endif
ccw_req_t *
dasd_eckd_reserve (struct dasd_device_t * device)
{
	ccw_req_t *cqr = ccw_alloc_request (dasd_eckd_discipline.name, 1 + 1, 0);
	if (cqr == NULL) {
		printk (KERN_WARNING PRINTK_HEADER
			"No memory to allocate initialization request\n");
		return NULL;
	}
	cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
	cqr->device = device;
	cqr->retries = 0;
	cqr->status = CQR_STATUS_FILLED;
	return cqr;
}

ccw_req_t *
dasd_eckd_release (struct dasd_device_t * device)
{
	ccw_req_t *cqr = ccw_alloc_request (dasd_eckd_discipline.name, 1 + 1, 0);
	if (cqr == NULL) {
		printk (KERN_WARNING PRINTK_HEADER
			"No memory to allocate initialization request\n");
		return NULL;
	}
	cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
	cqr->device = device;
	cqr->retries = 0;
	cqr->status = CQR_STATUS_FILLED;
	return cqr;

}

static inline ccw1_t *
dasd_eckd_find_cmd (ccw_req_t * cqr, int cmd)
{
	ccw1_t *cp;

	cp = cqr->cpaddr;
        do {
		if (cp->cmd_code == cmd)
			return cp;
		if (cp->cmd_code == CCW_CMD_TIC) {
			cp = (ccw1_t *)cp->cda;
                        continue;
		} 
                if ( cp->flags & (CCW_FLAG_DC | CCW_FLAG_CC) ) {
                        cp ++;
                        continue;
		}
                break;
	} while ( 1 );
        return NULL;
}

ccw_req_t *
dasd_eckd_merge_cp ( dasd_device_t *device )
{
        ccw_req_t * cqr;
        return NULL;
}

static char *
dasd_eckd_dump_sense (struct dasd_device_t *device, ccw_req_t * req)
{
	char *page = (char *) get_free_page (GFP_KERNEL);
	devstat_t *stat = &device->dev_status;
	char *sense = stat->ii.sense.data;
	int len, sl, sct;

	if (page == NULL) {
		return NULL;
	}
	len = sprintf (page, KERN_WARNING PRINTK_HEADER
		       "device %04X on irq %d: I/O status report:\n",
		       device->devinfo.devno, device->devinfo.irq);
	len += sprintf (page + len, KERN_WARNING PRINTK_HEADER
			"in req: %p CS: 0x%02X DS: 0x%02X\n",
			req, stat->cstat, stat->dstat);
	len += sprintf (page + len, KERN_WARNING PRINTK_HEADER
			"Failing CCW: %p\n", (void *) stat->cpa);
        {
            ccw1_t *act = req -> cpaddr;
            int i = req -> cplength;
            do {
#if 0
                printk ( KERN_INFO "CCW %p: %08X %08X\n", 
                         act,((int*)act)[0],((int*)act)[1]);
                printk ( KERN_INFO "DAT: %08X %08X %08X %08X\n", 
                         ((int*)act->cda)[0],((int*)act->cda)[1],
                         ((int*)act->cda)[2],((int*)act->cda)[3]);
#endif
                act ++;
            } while ( --i );
        }
	if (stat->flag & DEVSTAT_FLAG_SENSE_AVAIL) {
		for (sl = 0; sl < 4; sl++) {
			len += sprintf (page + len, KERN_WARNING PRINTK_HEADER
					"Sense(hex) %2d-%2d:",
					(8 * sl),
					((8 * sl) + 7));

			for (sct = 0; sct < 8; sct++) {
				len += sprintf (page + len, " %02x",
						sense[8 * sl + sct]);
			}
			len += sprintf (page + len, "\n");
		}

		if (sense[27] & DASD_SENSE_BIT_0) {
			/* 24 Byte Sense Data */
			len += sprintf (page + len, KERN_WARNING PRINTK_HEADER
				     "24 Byte: %x MSG %x, %s MSGb to SYSOP\n",
					sense[7] >> 4, sense[7] & 0x0f,
					sense[1] & 0x10 ? "" : "no");
		} else {
			/* 32 Byte Sense Data */
			len += sprintf (page + len, KERN_WARNING PRINTK_HEADER
				   "32 Byte: Format: %x Exception class %x\n",
					sense[6] & 0x0f, sense[22] >> 4);
		}
	}
	return page;
}

dasd_discipline_t dasd_eckd_discipline =
{
	name:"ECKD",
	ebcname:"ECKD",
	id_check:dasd_eckd_id_check,
	check_characteristics:dasd_eckd_check_characteristics,
	init_analysis:dasd_eckd_init_analysis,
	do_analysis:dasd_eckd_do_analysis,
	fill_geometry:dasd_eckd_fill_geometry,
	start_IO:dasd_start_IO,
	format_device:dasd_eckd_format_device,
	examine_error:dasd_eckd_examine_error,
	erp_action:dasd_eckd_erp_action,
	erp_postaction:dasd_eckd_erp_postaction,
	build_cp_from_req:dasd_eckd_build_cp_from_req,
	dump_sense:dasd_eckd_dump_sense,
	int_handler:dasd_int_handler,
	reserve:dasd_eckd_reserve,
	release:dasd_eckd_release,
	merge_cp:dasd_eckd_merge_cp
};

int
dasd_eckd_init (void)
{
	int rc = 0;
	printk (KERN_INFO PRINTK_HEADER
		"%s discipline initializing\n", dasd_eckd_discipline.name);
	ASCEBC (dasd_eckd_discipline.ebcname, 4);
	dasd_discipline_enq (&dasd_eckd_discipline);
#ifdef CONFIG_DASD_DYNAMIC
        {
	int i;
	for (i = 0; i < sizeof (dasd_eckd_known_devices) / sizeof (devreg_t); i++) {
		printk (KERN_INFO PRINTK_HEADER
			"We are interested in: CU %04X/%02x DEV: %04X/%02Xi\n",
			dasd_eckd_known_devices[i].ci.hc.ctype,
			dasd_eckd_known_devices[i].ci.hc.cmode,
			dasd_eckd_known_devices[i].ci.hc.dtype,
			dasd_eckd_known_devices[i].ci.hc.dmode);
		s390_device_register (&dasd_eckd_known_devices[i]);
	}
        }
#endif				/* CONFIG_DASD_DYNAMIC */
	return rc;
}

void
dasd_eckd_cleanup( void ) {
        printk ( KERN_INFO PRINTK_HEADER
                 "%s discipline cleaning up\n", dasd_eckd_discipline.name);
#ifdef CONFIG_DASD_DYNAMIC
        {
	int i;
        for ( i=0; i<sizeof(dasd_eckd_known_devices)/sizeof(devreg_t); i++) {
		printk (KERN_INFO PRINTK_HEADER
			"We are interested in: CU %04X/%02x DEV: %04X/%02Xi\n",
			dasd_eckd_known_devices[i].ci.hc.ctype,
			dasd_eckd_known_devices[i].ci.hc.cmode,
			dasd_eckd_known_devices[i].ci.hc.dtype,
			dasd_eckd_known_devices[i].ci.hc.dmode);
		s390_device_register(&dasd_eckd_known_devices[i]);
	}
        } 
#endif /* CONFIG_DASD_DYNAMIC */
        dasd_discipline_deq(&dasd_eckd_discipline);
}

/*
 * 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:
 */
