drivers/ata/pata_parport/ktti.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * (c) 1998  Grant R. Guenther <grant@torque.net>
   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 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/delay.h>
  14 #include <linux/kernel.h>
  15 #include <linux/types.h>
  16 #include <linux/wait.h>
  17 #include <asm/io.h>
  18 #include "pata_parport.h"
  19
  20 #define j44(a, b)       (((a >> 4) & 0x0f) | (b & 0xf0))
  21
  22 /*
  23  * cont = 0 - access the IDE register file
  24  * cont = 1 - access the IDE command set
  25  */
  26 static int cont_map[2] = { 0x10, 0x08 };
  27
  28 static void ktti_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
  29 {
  30         int r = regr + cont_map[cont];
  31
  32         w0(r); w2(0xb); w2(0xa); w2(3); w2(6);
  33         w0(val); w2(3); w0(0); w2(6); w2(0xb);
  34 }
  35
  36 static int ktti_read_regr(struct pi_adapter *pi, int cont, int regr)
  37 {
  38         int a, b, r;
  39
  40         r = regr + cont_map[cont];
  41
  42         w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
  43         a = r1(); w2(0xc);  b = r1(); w2(9); w2(0xc); w2(9);
  44         return j44(a, b);
  45 }
  46
  47 static void ktti_read_block(struct pi_adapter *pi, char *buf, int count)
  48 {
  49         int k, a, b;
  50
  51         for (k = 0; k < count / 2; k++) {
  52                 w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
  53                 a = r1(); w2(0xc); b = r1(); w2(9);
  54                 buf[2*k] = j44(a, b);
  55                 a = r1(); w2(0xc); b = r1(); w2(9);
  56                 buf[2*k+1] = j44(a, b);
  57         }
  58 }
  59
  60 static void ktti_write_block(struct pi_adapter *pi, char *buf, int count)
  61 {
  62         int k;
  63
  64         for (k = 0; k < count / 2; k++) {
  65                 w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);
  66                 w0(buf[2 * k]); w2(3);
  67                 w0(buf[2 * k + 1]); w2(6);
  68                 w2(0xb);
  69         }
  70 }
  71
  72 static void ktti_connect(struct pi_adapter *pi)
  73 {
  74         pi->saved_r0 = r0();
  75         pi->saved_r2 = r2();
  76         w2(0xb); w2(0xa); w0(0); w2(3); w2(6);
  77 }
  78
  79 static void ktti_disconnect(struct pi_adapter *pi)
  80 {
  81         w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);
  82         w0(pi->saved_r0);
  83         w2(pi->saved_r2);
  84 }
  85
  86 static void ktti_log_adapter(struct pi_adapter *pi)
  87 {
  88         dev_info(&pi->dev, "KT adapter at 0x%x, delay %d\n",
  89                  pi->port, pi->delay);
  90 }
  91
  92 static struct pi_protocol ktti = {
  93         .owner          = THIS_MODULE,
  94         .name           = "ktti",
  95         .max_mode       = 1,
  96         .epp_first      = 2,
  97         .default_delay  = 1,
  98         .max_units      = 1,
  99         .write_regr     = ktti_write_regr,
 100         .read_regr      = ktti_read_regr,
 101         .write_block    = ktti_write_block,
 102         .read_block     = ktti_read_block,
 103         .connect        = ktti_connect,
 104         .disconnect     = ktti_disconnect,
 105         .log_adapter    = ktti_log_adapter,
 106 };
 107
 108 MODULE_LICENSE("GPL");
 109 MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
 110 MODULE_DESCRIPTION("KT Technology parallel port IDE adapter protocol driver");
 111 module_pata_parport_driver(ktti);