drivers/block/paride/on20.c

   1 /*
   2         on20.c  (c) 1996-8  Grant R. Guenther <grant@torque.net>
   3                             Under the terms of the GNU General Public License.
   4
   5         on20.c is a low-level protocol driver for the
   6         Onspec 90c20 parallel to IDE adapter.
   7 */
   8
   9 /* Changes:
  10
  11         1.01    GRG 1998.05.06 init_proto, release_proto
  12
  13 */
  14
  15 #define ON20_VERSION    "1.01"
  16
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/delay.h>
  20 #include <linux/kernel.h>
  21 #include <linux/types.h>
  22 #include <linux/wait.h>
  23 #include <asm/io.h>
  24
  25 #include "paride.h"
  26
  27 #define op(f)   w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);
  28 #define vl(v)   w2(4);w0(v);w2(5);w2(7);w2(5);w2(4);
  29
  30 #define j44(a,b)  (((a>>4)&0x0f)|(b&0xf0))
  31
  32 /* cont = 0 - access the IDE register file
  33    cont = 1 - access the IDE command set
  34 */
  35
  36 static int on20_read_regr( PIA *pi, int cont, int regr )
  37
  38 {       int h,l, r ;
  39
  40         r = (regr<<2) + 1 + cont;
  41
  42         op(1); vl(r); op(0);
  43
  44         switch (pi->mode)  {
  45
  46         case 0:  w2(4); w2(6); l = r1();
  47                  w2(4); w2(6); h = r1();
  48                  w2(4); w2(6); w2(4); w2(6); w2(4);
  49                  return j44(l,h);
  50
  51         case 1:  w2(4); w2(0x26); r = r0();
  52                  w2(4); w2(0x26); w2(4);
  53                  return r;
  54
  55         }
  56         return -1;
  57 }
  58
  59 static void on20_write_regr( PIA *pi, int cont, int regr, int val )
  60
  61 {       int r;
  62
  63         r = (regr<<2) + 1 + cont;
  64
  65         op(1); vl(r);
  66         op(0); vl(val);
  67         op(0); vl(val);
  68 }
  69
  70 static void on20_connect ( PIA *pi)
  71
  72 {       pi->saved_r0 = r0();
  73         pi->saved_r2 = r2();
  74
  75         w2(4);w0(0);w2(0xc);w2(4);w2(6);w2(4);w2(6);w2(4);
  76         if (pi->mode) { op(2); vl(8); op(2); vl(9); }
  77                else   { op(2); vl(0); op(2); vl(8); }
  78 }
  79
  80 static void on20_disconnect ( PIA *pi )
  81
  82 {       w2(4);w0(7);w2(4);w2(0xc);w2(4);
  83         w0(pi->saved_r0);
  84         w2(pi->saved_r2);
  85 }
  86
  87 static void on20_read_block( PIA *pi, char * buf, int count )
  88
  89 {       int     k, l, h;
  90
  91         op(1); vl(1); op(0);
  92
  93         for (k=0;k<count;k++)
  94             if (pi->mode) {
  95                 w2(4); w2(0x26); buf[k] = r0();
  96             } else {
  97                 w2(6); l = r1(); w2(4);
  98                 w2(6); h = r1(); w2(4);
  99                 buf[k] = j44(l,h);
 100             }
 101         w2(4);
 102 }
 103
 104 static void on20_write_block(  PIA *pi, char * buf, int count )
 105
 106 {       int     k;
 107
 108         op(1); vl(1); op(0);
 109
 110         for (k=0;k<count;k++) { w2(5); w0(buf[k]); w2(7); }
 111         w2(4);
 112 }
 113
 114 static void on20_log_adapter( PIA *pi, char * scratch, int verbose )
 115
 116 {       char    *mode_string[2] = {"4-bit","8-bit"};
 117
 118         printk("%s: on20 %s, OnSpec 90c20 at 0x%x, ",
 119                 pi->device,ON20_VERSION,pi->port);
 120         printk("mode %d (%s), delay %d\n",pi->mode,
 121                 mode_string[pi->mode],pi->delay);
 122
 123 }
 124
 125 static struct pi_protocol on20 = {
 126         .owner          = THIS_MODULE,
 127         .name           = "on20",
 128         .max_mode       = 2,
 129         .epp_first      = 2,
 130         .default_delay  = 1,
 131         .max_units      = 1,
 132         .write_regr     = on20_write_regr,
 133         .read_regr      = on20_read_regr,
 134         .write_block    = on20_write_block,
 135         .read_block     = on20_read_block,
 136         .connect        = on20_connect,
 137         .disconnect     = on20_disconnect,
 138         .log_adapter    = on20_log_adapter,
 139 };
 140
 141 static int __init on20_init(void)
 142 {
 143         return pi_register(&on20)-1;
 144 }
 145
 146 static void __exit on20_exit(void)
 147 {
 148         pi_unregister(&on20);
 149 }
 150
 151 MODULE_LICENSE("GPL");
 152 module_init(on20_init)
 153 module_exit(on20_exit)