/*  Driver for the PPA3 parallel port SCSI HBA embedded in 
 * the Iomega ZIP drive
 * 
 * (c) 1996     Grant R. Guenther  grant@torque.net
 *              David Campbell     campbell@torque.net
 *
 *      All comments to David.
 */

#ifndef _PPA_H
#define _PPA_H

#define   PPA_VERSION   "2.07 (for Linux 2.2.x)"

/* 
 * this driver has been hacked by Matteo Frigo (athena@theory.lcs.mit.edu)
 * to support EPP and scatter-gather.                        [0.26-athena]
 *
 * additional hacks by David Campbell
 * in response to this driver "mis-behaving" on his machine.
 *      Fixed EPP to handle "software" changing of EPP port data direction.
 *      Chased down EPP timeouts
 *      Made this driver "kernel version friendly"           [0.28-athena]
 *
 * [ Stuff removed ]
 *
 * Corrected ppa.h for 2.1.x kernels (>=2.1.85)
 * Modified "Nat Semi Kludge" for extended chipsets
 *                                                      [1.41]
 *
 * Fixed id_probe for EPP 1.9 chipsets (misdetected as EPP 1.7)
 *                                                      [1.42]
 *
 * Development solely for 2.1.x kernels from now on!
 *                                                      [2.00]
 *
 * Hack and slash at the init code (EPP device check routine)
 * Added INSANE option.
 *                                                      [2.01]
 *
 * Patch applied to sync against the 2.1.x kernel code
 * Included qboot_zip.sh
 *                                                      [2.02]
 *
 * Cleaned up the mess left by someone else trying to fix the
 * asm section to keep egcc happy. The asm section no longer
 * exists, the nibble code is *almost* as fast as the asm code
 * providing it is compiled with egcc.
 *
 * Other clean ups include the follow changes:
 *    CONFIG_SCSI_PPA_HAVE_PEDANTIC => CONFIG_SCSI_IZIP_EPP16
 *    added CONFIG_SCSI_IZIP_SLOW_CTR option
 *                                                      [2.03]
 *
 * Use ppa_wait() to check for ready AND connected status bits
 * Busy wait for connected status bit in ppa_completion()
 *  in order to cope with some hardware that has this bit low
 *  for short periods of time.
 * Add udelay() to ppa_select()
 *  by Dr. Peter Cherriman and
 *     Oleg Makarenko <omakarenko@cyberplat.ru>
 *                                                      [2.04a]
 *
 * Fix kernel panic on scsi timeout, 2000-08-18		[2.07]
 */
/* ------ END OF USER CONFIGURABLE PARAMETERS ----- */

#ifdef PPA_CODE
#include  <linux/config.h>
#include  <linux/stddef.h>
#include  <linux/module.h>
#include  <linux/kernel.h>
#include  <linux/tqueue.h>
#include  <linux/ioport.h>
#include  <linux/delay.h>
#include  <linux/proc_fs.h>
#include  <linux/stat.h>
#include  <linux/blk.h>
#include  <linux/sched.h>
#include  <linux/interrupt.h>

#include  <asm/io.h>
#include  "sd.h"
#include  "hosts.h"
/* batteries not included :-) */

/*
 * modes in which the driver can operate 
 */
#define   PPA_AUTODETECT        0	/* Autodetect mode                */
#define   PPA_NIBBLE            1	/* work in standard 4 bit mode    */
#define   PPA_PS2               2	/* PS/2 byte mode         */
#define   PPA_EPP_8             3	/* EPP mode, 8 bit                */
#define   PPA_EPP_16            4	/* EPP mode, 16 bit               */
#define   PPA_EPP_32            5	/* EPP mode, 32 bit               */
#define   PPA_UNKNOWN           6	/* Just in case...                */

static char *PPA_MODE_STRING[] =
{
    "Autodetect",
    "SPP",
    "PS/2",
    "EPP 8 bit",
    "EPP 16 bit",
#ifdef CONFIG_SCSI_IZIP_EPP16
    "EPP 16 bit",
#else
    "EPP 32 bit",
#endif
    "Unknown"};

/* This is a global option */
int ppa_sg = SG_ALL;		/* enable/disable scatter-gather. */

/* other options */
#define PPA_CAN_QUEUE   1	/* use "queueing" interface */
#define PPA_BURST_SIZE	512	/* data burst size */
#define PPA_SELECT_TMO  5000	/* how long to wait for target ? */
#define PPA_SPIN_TMO    50000	/* ppa_wait loop limiter */
#define PPA_RECON_TMO   500	/* scsi reconnection loop limiter */
#define PPA_DEBUG	0	/* debuging option */
#define IN_EPP_MODE(x) (x == PPA_EPP_8 || x == PPA_EPP_16 || x == PPA_EPP_32)

/* args to ppa_connect */
#define CONNECT_EPP_MAYBE 1
#define CONNECT_NORMAL  0

#define r_dtr(x)        (unsigned char)inb((x))
#define r_str(x)        (unsigned char)inb((x)+1)
#define r_ctr(x)        (unsigned char)inb((x)+2)
#define r_epp(x)        (unsigned char)inb((x)+4)
#define r_fifo(x)       (unsigned char)inb((x)) /* x must be base_hi */
					/* On PCI is base+0x400 != base_hi */
#define r_ecr(x)        (unsigned char)inb((x)+0x2) /* x must be base_hi */

#define w_dtr(x,y)      outb(y, (x))
#define w_str(x,y)      outb(y, (x)+1)
#define w_epp(x,y)      outb(y, (x)+4)
#define w_fifo(x,y)     outb(y, (x))	/* x must be base_hi */
#define w_ecr(x,y)      outb(y, (x)+0x2)/* x must be base_hi */

#ifdef CONFIG_SCSI_IZIP_SLOW_CTR
#define w_ctr(x,y)      outb_p(y, (x)+2)
#else
#define w_ctr(x,y)      outb(y, (x)+2)
#endif

static int ppa_engine(ppa_struct *, Scsi_Cmnd *);
static int ppa_in(int, char *, int);
static int ppa_init(int);
static void ppa_interrupt(void *);
static int ppa_out(int, char *, int);

struct proc_dir_entry proc_scsi_ppa =
{PROC_SCSI_PPA, 3, "ppa", S_IFDIR | S_IRUGO | S_IXUGO, 2};
#else
extern struct proc_dir_entry proc_scsi_ppa;
#define ppa_release 0
#endif

int ppa_detect(Scsi_Host_Template *);
const char *ppa_info(struct Scsi_Host *);
int ppa_command(Scsi_Cmnd *);
int ppa_queuecommand(Scsi_Cmnd *, void (*done) (Scsi_Cmnd *));
int ppa_abort(Scsi_Cmnd *);
int ppa_reset(Scsi_Cmnd *);
int ppa_proc_info(char *, char **, off_t, int, int, int);
int ppa_biosparam(Disk *, kdev_t, int *);

#define PPA {	proc_dir:			&proc_scsi_ppa,		\
		proc_info:			ppa_proc_info,		\
		name:				"Iomega VPI0 (ppa) interface",\
		detect:				ppa_detect,		\
		release:			ppa_release,		\
		command:			ppa_command,		\
		queuecommand:			ppa_queuecommand,	\
		eh_abort_handler:		ppa_abort,		\
		eh_device_reset_handler:	NULL,			\
		eh_bus_reset_handler:		ppa_reset,		\
		eh_host_reset_handler:		ppa_reset,		\
		use_new_eh_code:		1,			\
		bios_param:			ppa_biosparam,		\
		this_id:			-1,			\
		sg_tablesize:			SG_ALL,			\
		cmd_per_lun:			1,			\
		use_clustering:			ENABLE_CLUSTERING	\
}
#endif				/* _PPA_H */
