drivers/block/paride/aten.c

   1 /*
   2         aten.c  (c) 1997-8  Grant R. Guenther <grant@torque.net>
   3                             Under the terms of the GNU General Public License.
   4
   5         aten.c is a low-level protocol driver for the ATEN EH-100
   6         parallel port adapter.  The EH-100 supports 4-bit and 8-bit
   7         modes only.  There is also an EH-132 which supports EPP mode
   8         transfers.  The EH-132 is not yet supported.
   9
  10 */
  11
  12 /* Changes:
  13
  14         1.01    GRG 1998.05.05  init_proto, release_proto
  15
  16 */
  17
  18 #define ATEN_VERSION      "1.01"
  19
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/delay.h>
  23 #include <linux/kernel.h>
  24 #include <linux/wait.h>
  25 #include <linux/types.h>
  26 #include <asm/io.h>
  27
  28 #include "paride.h"
  29
  30 #define j44(a,b)                ((((a>>4)&0x0f)|(b&0xf0))^0x88)
  31
  32 /* cont = 0 - access the IDE register file
  33    cont = 1 - access the IDE command set
  34 */
  35
  36 static int  cont_map[2] = { 0x08, 0x20 };
  37
  38 static void  aten_write_regr( PIA *pi, int cont, int regr, int val)
  39
  40 {       int r;
  41
  42         r = regr + cont_map[cont] + 0x80;
  43
  44         w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);
  45 }
  46
  47 static int aten_read_regr( PIA *pi, int cont, int regr )
  48
  49 {       int  a, b, r;
  50
  51         r = regr + cont_map[cont] + 0x40;
  52
  53         switch (pi->mode) {
  54
  55         case 0: w0(r); w2(0xe); w2(6);
  56                 w2(7); w2(6); w2(0);
  57                 a = r1(); w0(0x10); b = r1(); w2(0xc);
  58                 return j44(a,b);
  59
  60         case 1: r |= 0x10;
  61                 w0(r); w2(0xe); w2(6); w0(0xff);
  62                 w2(0x27); w2(0x26); w2(0x20);
  63                 a = r0();
  64                 w2(0x26); w2(0xc);
  65                 return a;
  66         }
  67         return -1;
  68 }
  69
  70 static void aten_read_block( PIA *pi, char * buf, int count )
  71
  72 {       int  k, a, b, c, d;
  73
  74         switch (pi->mode) {
  75
  76         case 0: w0(0x48); w2(0xe); w2(6);
  77                 for (k=0;k<count/2;k++) {
  78                         w2(7); w2(6); w2(2);
  79                         a = r1(); w0(0x58); b = r1();
  80                         w2(0); d = r1(); w0(0x48); c = r1();
  81                         buf[2*k] = j44(c,d);
  82                         buf[2*k+1] = j44(a,b);
  83                 }
  84                 w2(0xc);
  85                 break;
  86
  87         case 1: w0(0x58); w2(0xe); w2(6);
  88                 for (k=0;k<count/2;k++) {
  89                         w2(0x27); w2(0x26); w2(0x22);
  90                         a = r0(); w2(0x20); b = r0();
  91                         buf[2*k] = b; buf[2*k+1] = a;
  92                 }
  93                 w2(0x26); w2(0xc);
  94                 break;
  95         }
  96 }
  97
  98 static void aten_write_block( PIA *pi, char * buf, int count )
  99
 100 {       int k;
 101
 102         w0(0x88); w2(0xe); w2(6);
 103         for (k=0;k<count/2;k++) {
 104                 w0(buf[2*k+1]); w2(0xe); w2(6);
 105                 w0(buf[2*k]); w2(7); w2(6);
 106         }
 107         w2(0xc);
 108 }
 109
 110 static void aten_connect ( PIA *pi  )
 111
 112 {       pi->saved_r0 = r0();
 113         pi->saved_r2 = r2();
 114         w2(0xc);
 115 }
 116
 117 static void aten_disconnect ( PIA *pi )
 118
 119 {       w0(pi->saved_r0);
 120         w2(pi->saved_r2);
 121 }
 122
 123 static void aten_log_adapter( PIA *pi, char * scratch, int verbose )
 124
 125 {       char    *mode_string[2] = {"4-bit","8-bit"};
 126
 127         printk("%s: aten %s, ATEN EH-100 at 0x%x, ",
 128                 pi->device,ATEN_VERSION,pi->port);
 129         printk("mode %d (%s), delay %d\n",pi->mode,
 130                 mode_string[pi->mode],pi->delay);
 131
 132 }
 133
 134 static struct pi_protocol aten = {
 135         .owner          = THIS_MODULE,
 136         .name           = "aten",
 137         .max_mode       = 2,
 138         .epp_first      = 2,
 139         .default_delay  = 1,
 140         .max_units      = 1,
 141         .write_regr     = aten_write_regr,
 142         .read_regr      = aten_read_regr,
 143         .write_block    = aten_write_block,
 144         .read_block     = aten_read_block,
 145         .connect        = aten_connect,
 146         .disconnect     = aten_disconnect,
 147         .log_adapter    = aten_log_adapter,
 148 };
 149
 150 static int __init aten_init(void)
 151 {
 152         return paride_register(&aten);
 153 }
 154
 155 static void __exit aten_exit(void)
 156 {
 157         paride_unregister( &aten );
 158 }
 159
 160 MODULE_LICENSE("GPL");
 161 module_init(aten_init)
 162 module_exit(aten_exit)