1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * (c) 1998 Grant R. Guenther <grant@torque.net>
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_.
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>
18 #include "pata_parport.h"
20 #define j44(a, b) (((a >> 4) & 0x0f) | (b & 0xf0))
23 * cont = 0 - access the IDE register file
24 * cont = 1 - access the IDE command set
26 static int cont_map[2] = { 0x10, 0x08 };
28 static void ktti_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
30 int r = regr + cont_map[cont];
32 w0(r); w2(0xb); w2(0xa); w2(3); w2(6);
33 w0(val); w2(3); w0(0); w2(6); w2(0xb);
36 static int ktti_read_regr(struct pi_adapter *pi, int cont, int regr)
40 r = regr + cont_map[cont];
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);
47 static void ktti_read_block(struct pi_adapter *pi, char *buf, int count)
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);
55 a = r1(); w2(0xc); b = r1(); w2(9);
56 buf[2*k+1] = j44(a, b);
60 static void ktti_write_block(struct pi_adapter *pi, char *buf, int count)
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);
72 static void ktti_connect(struct pi_adapter *pi)
76 w2(0xb); w2(0xa); w0(0); w2(3); w2(6);
79 static void ktti_disconnect(struct pi_adapter *pi)
81 w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);
86 static void ktti_log_adapter(struct pi_adapter *pi)
88 dev_info(&pi->dev, "KT adapter at 0x%x, delay %d\n",
92 static struct pi_protocol ktti = {
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,
108 MODULE_LICENSE("GPL");
109 module_pata_parport_driver(ktti);