linux/drivers/scsi/ppa.h
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   1/*  Driver for the PPA3 parallel port SCSI HBA embedded in 
   2 * the Iomega ZIP drive
   3 * 
   4 * (c) 1996     Grant R. Guenther  grant@torque.net
   5 *              David Campbell
   6 *
   7 *      All comments to David.
   8 */
   9
  10#ifndef _PPA_H
  11#define _PPA_H
  12
  13#define   PPA_VERSION   "2.07 (for Linux 2.4.x)"
  14
  15/* 
  16 * this driver has been hacked by Matteo Frigo (athena@theory.lcs.mit.edu)
  17 * to support EPP and scatter-gather.                        [0.26-athena]
  18 *
  19 * additional hacks by David Campbell
  20 * in response to this driver "mis-behaving" on his machine.
  21 *      Fixed EPP to handle "software" changing of EPP port data direction.
  22 *      Chased down EPP timeouts
  23 *      Made this driver "kernel version friendly"           [0.28-athena]
  24 *
  25 * [ Stuff removed ]
  26 *
  27 * Corrected ppa.h for 2.1.x kernels (>=2.1.85)
  28 * Modified "Nat Semi Kludge" for extended chipsets
  29 *                                                      [1.41]
  30 *
  31 * Fixed id_probe for EPP 1.9 chipsets (misdetected as EPP 1.7)
  32 *                                                      [1.42]
  33 *
  34 * Development solely for 2.1.x kernels from now on!
  35 *                                                      [2.00]
  36 *
  37 * Hack and slash at the init code (EPP device check routine)
  38 * Added INSANE option.
  39 *                                                      [2.01]
  40 *
  41 * Patch applied to sync against the 2.1.x kernel code
  42 * Included qboot_zip.sh
  43 *                                                      [2.02]
  44 *
  45 * Cleaned up the mess left by someone else trying to fix the
  46 * asm section to keep egcc happy. The asm section no longer
  47 * exists, the nibble code is *almost* as fast as the asm code
  48 * providing it is compiled with egcc.
  49 *
  50 * Other clean ups include the follow changes:
  51 *    CONFIG_SCSI_PPA_HAVE_PEDANTIC => CONFIG_SCSI_IZIP_EPP16
  52 *    added CONFIG_SCSI_IZIP_SLOW_CTR option
  53 *                                                      [2.03]
  54 *
  55 * Use ppa_wait() to check for ready AND connected status bits
  56 * Add ppa_wait() calls to ppa_completion()
  57 *  by Peter Cherriman <pjc@ecs.soton.ac.uk> and
  58 *     Tim Waugh <twaugh@redhat.com>
  59 *                                                      [2.04]
  60 *
  61 * Fix kernel panic on scsi timeout, 2000-08-18         [2.05]
  62 *
  63 * Avoid io_request_lock problems.
  64 * John Cavan <johncavan@home.com>                      [2.06]
  65 *
  66 * Busy wait for connected status bit in ppa_completion()
  67 *  in order to cope with some hardware that has this bit low
  68 *  for short periods of time.
  69 * Add udelay() to ppa_select()
  70 *  by Peter Cherriman <pjc@ecs.soton.ac.uk> and
  71 *     Oleg Makarenko <omakarenko@cyberplat.ru>         
  72 *                                                      [2.07]
  73 */
  74/* ------ END OF USER CONFIGURABLE PARAMETERS ----- */
  75
  76#include  <linux/stddef.h>
  77#include  <linux/module.h>
  78#include  <linux/kernel.h>
  79#include  <linux/ioport.h>
  80#include  <linux/delay.h>
  81#include  <linux/proc_fs.h>
  82#include  <linux/stat.h>
  83#include  <linux/blkdev.h>
  84#include  <linux/sched.h>
  85#include  <linux/interrupt.h>
  86
  87#include  <asm/io.h>
  88#include  <scsi/scsi_host.h>
  89/* batteries not included :-) */
  90
  91/*
  92 * modes in which the driver can operate 
  93 */
  94#define   PPA_AUTODETECT        0       /* Autodetect mode                */
  95#define   PPA_NIBBLE            1       /* work in standard 4 bit mode    */
  96#define   PPA_PS2               2       /* PS/2 byte mode         */
  97#define   PPA_EPP_8             3       /* EPP mode, 8 bit                */
  98#define   PPA_EPP_16            4       /* EPP mode, 16 bit               */
  99#define   PPA_EPP_32            5       /* EPP mode, 32 bit               */
 100#define   PPA_UNKNOWN           6       /* Just in case...                */
 101
 102static char *PPA_MODE_STRING[] =
 103{
 104    "Autodetect",
 105    "SPP",
 106    "PS/2",
 107    "EPP 8 bit",
 108    "EPP 16 bit",
 109#ifdef CONFIG_SCSI_IZIP_EPP16
 110    "EPP 16 bit",
 111#else
 112    "EPP 32 bit",
 113#endif
 114    "Unknown"};
 115
 116/* other options */
 117#define PPA_BURST_SIZE  512     /* data burst size */
 118#define PPA_SELECT_TMO  5000    /* how long to wait for target ? */
 119#define PPA_SPIN_TMO    50000   /* ppa_wait loop limiter */
 120#define PPA_RECON_TMO   500     /* scsi reconnection loop limiter */
 121#define PPA_DEBUG       0       /* debugging option */
 122#define IN_EPP_MODE(x) (x == PPA_EPP_8 || x == PPA_EPP_16 || x == PPA_EPP_32)
 123
 124/* args to ppa_connect */
 125#define CONNECT_EPP_MAYBE 1
 126#define CONNECT_NORMAL  0
 127
 128#define r_dtr(x)        (unsigned char)inb((x))
 129#define r_str(x)        (unsigned char)inb((x)+1)
 130#define r_ctr(x)        (unsigned char)inb((x)+2)
 131#define r_epp(x)        (unsigned char)inb((x)+4)
 132#define r_fifo(x)       (unsigned char)inb((x)) /* x must be base_hi */
 133                                        /* On PCI is base+0x400 != base_hi */
 134#define r_ecr(x)        (unsigned char)inb((x)+0x2) /* x must be base_hi */
 135
 136#define w_dtr(x,y)      outb(y, (x))
 137#define w_str(x,y)      outb(y, (x)+1)
 138#define w_epp(x,y)      outb(y, (x)+4)
 139#define w_fifo(x,y)     outb(y, (x))    /* x must be base_hi */
 140#define w_ecr(x,y)      outb(y, (x)+0x2)/* x must be base_hi */
 141
 142#ifdef CONFIG_SCSI_IZIP_SLOW_CTR
 143#define w_ctr(x,y)      outb_p(y, (x)+2)
 144#else
 145#define w_ctr(x,y)      outb(y, (x)+2)
 146#endif
 147
 148static int ppa_engine(ppa_struct *, struct scsi_cmnd *);
 149
 150#endif                          /* _PPA_H */
 151
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