drivers/block/paride/fit2.c

   1 /*
   2         fit2.c        (c) 1998  Grant R. Guenther <grant@torque.net>
   3                           Under the terms of the GNU General Public License.
   4
   5         fit2.c is a low-level protocol driver for the older version
   6         of the Fidelity International Technology parallel port adapter.
   7         This adapter is used in their TransDisk 2000 and older TransDisk
   8         3000 portable hard-drives.  As far as I can tell, this device
   9         supports 4-bit mode _only_.
  10
  11         Newer models of the FIT products use an enhanced protocol.
  12         The "fit3" protocol module should support current drives.
  13
  14 */
  15
  16 #define FIT2_VERSION      "1.0"
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/delay.h>
  21 #include <linux/kernel.h>
  22 #include <linux/types.h>
  23 #include <linux/wait.h>
  24 #include <asm/io.h>
  25
  26 #include "paride.h"
  27
  28 #define j44(a,b)                (((a>>4)&0x0f)|(b&0xf0))
  29
  30 /* cont = 0 - access the IDE register file
  31    cont = 1 - access the IDE command set
  32
  33 NB:  The FIT adapter does not appear to use the control registers.
  34 So, we map ALT_STATUS to STATUS and NO-OP writes to the device
  35 control register - this means that IDE reset will not work on these
  36 devices.
  37
  38 */
  39
  40 static void  fit2_write_regr( PIA *pi, int cont, int regr, int val)
  41
  42 {       if (cont == 1) return;
  43         w2(0xc); w0(regr); w2(4); w0(val); w2(5); w0(0); w2(4);
  44 }
  45
  46 static int fit2_read_regr( PIA *pi, int cont, int regr )
  47
  48 {       int  a, b, r;
  49
  50         if (cont) {
  51           if (regr != 6) return 0xff;
  52           r = 7;
  53         } else r = regr + 0x10;
  54
  55         w2(0xc); w0(r); w2(4); w2(5);
  56                  w0(0); a = r1();
  57                  w0(1); b = r1();
  58         w2(4);
  59
  60         return j44(a,b);
  61
  62 }
  63
  64 static void fit2_read_block( PIA *pi, char * buf, int count )
  65
  66 {       int  k, a, b, c, d;
  67
  68         w2(0xc); w0(0x10);
  69
  70         for (k=0;k<count/4;k++) {
  71
  72                 w2(4); w2(5);
  73                 w0(0); a = r1(); w0(1); b = r1();
  74                 w0(3); c = r1(); w0(2); d = r1();
  75                 buf[4*k+0] = j44(a,b);
  76                 buf[4*k+1] = j44(d,c);
  77
  78                 w2(4); w2(5);
  79                        a = r1(); w0(3); b = r1();
  80                 w0(1); c = r1(); w0(0); d = r1();
  81                 buf[4*k+2] = j44(d,c);
  82                 buf[4*k+3] = j44(a,b);
  83
  84         }
  85
  86         w2(4);
  87
  88 }
  89
  90 static void fit2_write_block( PIA *pi, char * buf, int count )
  91
  92 {       int k;
  93
  94
  95         w2(0xc); w0(0);
  96         for (k=0;k<count/2;k++) {
  97                 w2(4); w0(buf[2*k]);
  98                 w2(5); w0(buf[2*k+1]);
  99         }
 100         w2(4);
 101 }
 102
 103 static void fit2_connect ( PIA *pi  )
 104
 105 {       pi->saved_r0 = r0();
 106         pi->saved_r2 = r2();
 107         w2(0xcc);
 108 }
 109
 110 static void fit2_disconnect ( PIA *pi )
 111
 112 {       w0(pi->saved_r0);
 113         w2(pi->saved_r2);
 114 }
 115
 116 static void fit2_log_adapter( PIA *pi, char * scratch, int verbose )
 117
 118 {       printk("%s: fit2 %s, FIT 2000 adapter at 0x%x, delay %d\n",
 119                 pi->device,FIT2_VERSION,pi->port,pi->delay);
 120
 121 }
 122
 123 static struct pi_protocol fit2 = {
 124         .owner          = THIS_MODULE,
 125         .name           = "fit2",
 126         .max_mode       = 1,
 127         .epp_first      = 2,
 128         .default_delay  = 1,
 129         .max_units      = 1,
 130         .write_regr     = fit2_write_regr,
 131         .read_regr      = fit2_read_regr,
 132         .write_block    = fit2_write_block,
 133         .read_block     = fit2_read_block,
 134         .connect        = fit2_connect,
 135         .disconnect     = fit2_disconnect,
 136         .log_adapter    = fit2_log_adapter,
 137 };
 138
 139 static int __init fit2_init(void)
 140 {
 141         return pi_register(&fit2)-1;
 142 }
 143
 144 static void __exit fit2_exit(void)
 145 {
 146         pi_unregister(&fit2);
 147 }
 148
 149 MODULE_LICENSE("GPL");
 150 module_init(fit2_init)
 151 module_exit(fit2_exit)