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 */
26static int cont_map[2] = { 0x10, 0x08 };
27
28static 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
36static 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
47static 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
60static 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
72static 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
79static 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
86static 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
92static 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
108MODULE_LICENSE("GPL");
109MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
110MODULE_DESCRIPTION("KT Technology parallel port IDE adapter protocol driver");
111module_pata_parport_driver(ktti);
112

source code of linux/drivers/ata/pata_parport/ktti.c