drivers/block/paride/ktti.c

   1 /*
   2         ktti.c        (c) 1998  Grant R. Guenther <grant@torque.net>
   3                           Under the terms of the GNU General Public License.
   4
   5         ktti.c is a low-level protocol driver for the KT Technology
   6         parallel port adapter.  This adapter is used in the "PHd"
   7         portable hard-drives.  As far as I can tell, this device
   8         supports 4-bit mode _only_.
   9
  10 */
  11
  12 #define KTTI_VERSION      "1.0"
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/delay.h>
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19 #include <linux/wait.h>
  20 #include <asm/io.h>
  21
  22 #include "paride.h"
  23
  24 #define j44(a,b)                (((a>>4)&0x0f)|(b&0xf0))
  25
  26 /* cont = 0 - access the IDE register file
  27    cont = 1 - access the IDE command set
  28 */
  29
  30 static int  cont_map[2] = { 0x10, 0x08 };
  31
  32 static void  ktti_write_regr( PIA *pi, int cont, int regr, int val)
  33
  34 {       int r;
  35
  36         r = regr + cont_map[cont];
  37
  38         w0(r); w2(0xb); w2(0xa); w2(3); w2(6);
  39         w0(val); w2(3); w0(0); w2(6); w2(0xb);
  40 }
  41
  42 static int ktti_read_regr( PIA *pi, int cont, int regr )
  43
  44 {       int  a, b, r;
  45
  46         r = regr + cont_map[cont];
  47
  48         w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
  49         a = r1(); w2(0xc);  b = r1(); w2(9); w2(0xc); w2(9);
  50         return j44(a,b);
  51
  52 }
  53
  54 static void ktti_read_block( PIA *pi, char * buf, int count )
  55
  56 {       int  k, a, b;
  57
  58         for (k=0;k<count/2;k++) {
  59                 w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
  60                 a = r1(); w2(0xc); b = r1(); w2(9);
  61                 buf[2*k] = j44(a,b);
  62                 a = r1(); w2(0xc); b = r1(); w2(9);
  63                 buf[2*k+1] = j44(a,b);
  64         }
  65 }
  66
  67 static void ktti_write_block( PIA *pi, char * buf, int count )
  68
  69 {       int k;
  70
  71         for (k=0;k<count/2;k++) {
  72                 w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);
  73                 w0(buf[2*k]); w2(3);
  74                 w0(buf[2*k+1]); w2(6);
  75                 w2(0xb);
  76         }
  77 }
  78
  79 static void ktti_connect ( PIA *pi  )
  80
  81 {       pi->saved_r0 = r0();
  82         pi->saved_r2 = r2();
  83         w2(0xb); w2(0xa); w0(0); w2(3); w2(6);
  84 }
  85
  86 static void ktti_disconnect ( PIA *pi )
  87
  88 {       w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);
  89         w0(pi->saved_r0);
  90         w2(pi->saved_r2);
  91 }
  92
  93 static void ktti_log_adapter( PIA *pi, char * scratch, int verbose )
  94
  95 {       printk("%s: ktti %s, KT adapter at 0x%x, delay %d\n",
  96                 pi->device,KTTI_VERSION,pi->port,pi->delay);
  97
  98 }
  99
 100 static struct pi_protocol ktti = {
 101         .owner          = THIS_MODULE,
 102         .name           = "ktti",
 103         .max_mode       = 1,
 104         .epp_first      = 2,
 105         .default_delay  = 1,
 106         .max_units      = 1,
 107         .write_regr     = ktti_write_regr,
 108         .read_regr      = ktti_read_regr,
 109         .write_block    = ktti_write_block,
 110         .read_block     = ktti_read_block,
 111         .connect        = ktti_connect,
 112         .disconnect     = ktti_disconnect,
 113         .log_adapter    = ktti_log_adapter,
 114 };
 115
 116 static int __init ktti_init(void)
 117 {
 118         return pi_register(&ktti)-1;
 119 }
 120
 121 static void __exit ktti_exit(void)
 122 {
 123         pi_unregister(&ktti);
 124 }
 125
 126 MODULE_LICENSE("GPL");
 127 module_init(ktti_init)
 128 module_exit(ktti_exit)