drivers/scsi/ppa.h

   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
 102 static 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
 148 static int ppa_engine(ppa_struct *, struct scsi_cmnd *);
 149
 150 #endif                          /* _PPA_H */