fit3.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * (c) 1998  Grant R. Guenther <grant@torque.net>
  4 *
  5 * fit3.c is a low-level protocol driver for newer models
  6 * of the Fidelity International Technology parallel port adapter.
  7 * This adapter is used in their TransDisk 3000 portable
  8 * hard-drives, as well as CD-ROM, PD-CD and other devices.
  9 *
 10 * The TD-2000 and certain older devices use a different protocol.
 11 * Try the fit2 protocol module with them.
 12 */
 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#include "pata_parport.h"
 22
 23#define j44(a, b)	(((a >> 3) & 0x0f) | ((b << 1) & 0xf0))
 24
 25#define w7(byte)	out_p(7, byte)
 26#define r7()		(in_p(7) & 0xff)
 27
 28/*
 29 * cont = 0 - access the IDE register file
 30 * cont = 1 - access the IDE command set
 31 */
 32
 33static void fit3_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
 34{
 35	regr += cont << 3;
 36
 37	switch (pi->mode) {
 38	case 0:
 39	case 1:
 40		w2(0xc); w0(regr); w2(0x8); w2(0xc);
 41		w0(val); w2(0xd);
 42		w0(0);   w2(0xc);
 43		break;
 44	case 2:
 45		w2(0xc); w0(regr); w2(0x8); w2(0xc);
 46		w4(val); w4(0);
 47		w2(0xc);
 48		break;
 49	}
 50}
 51
 52static int fit3_read_regr(struct pi_adapter *pi, int cont, int regr)
 53{
 54	int  a, b;
 55
 56	regr += cont << 3;
 57
 58	switch (pi->mode) {
 59	case 0:
 60		w2(0xc); w0(regr + 0x10); w2(0x8); w2(0xc);
 61		w2(0xd); a = r1();
 62		w2(0xf); b = r1();
 63		w2(0xc);
 64		return j44(a, b);
 65	case 1:
 66		w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
 67		w2(0xec); w2(0xee); w2(0xef); a = r0();
 68		w2(0xc);
 69		return a;
 70	case 2:
 71		w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
 72		w2(0xec);
 73		a = r4(); b = r4();
 74		w2(0xc);
 75		return a;
 76	}
 77
 78	return -1;
 79}
 80
 81static void fit3_read_block(struct pi_adapter *pi, char *buf, int count)
 82{
 83	int  k, a, b, c, d;
 84
 85	switch (pi->mode) {
 86	case 0:
 87		w2(0xc); w0(0x10); w2(0x8); w2(0xc);
 88		for (k = 0; k < count / 2; k++) {
 89			w2(0xd); a = r1();
 90			w2(0xf); b = r1();
 91			w2(0xc); c = r1();
 92			w2(0xe); d = r1();
 93			buf[2 * k] = j44(a, b);
 94			buf[2 * k + 1] = j44(c, d);
 95		}
 96		w2(0xc);
 97		break;
 98	case 1:
 99		w2(0xc); w0(0x90); w2(0x8); w2(0xc);
100		w2(0xec); w2(0xee);
101		for (k = 0; k < count / 2; k++) {
102			w2(0xef); a = r0();
103			w2(0xee); b = r0();
104			buf[2 * k] = a;
105			buf[2 * k + 1] = b;
106		}
107		w2(0xec);
108		w2(0xc);
109		break;
110	case 2:
111		w2(0xc); w0(0x90); w2(0x8); w2(0xc);
112		w2(0xec);
113		for (k = 0; k < count; k++)
114			buf[k] = r4();
115		w2(0xc);
116		break;
117	}
118}
119
120static void fit3_write_block(struct pi_adapter *pi, char *buf, int count)
121{
122	int k;
123
124	switch (pi->mode) {
125	case 0:
126	case 1:
127		w2(0xc); w0(0); w2(0x8); w2(0xc);
128		for (k = 0; k < count / 2; k++) {
129			w0(buf[2 * k]); w2(0xd);
130			w0(buf[2 * k + 1]); w2(0xc);
131		}
132		break;
133	case 2:
134		w2(0xc); w0(0); w2(0x8); w2(0xc);
135		for (k = 0; k < count; k++)
136			w4(buf[k]);
137		w2(0xc);
138		break;
139	}
140}
141
142static void fit3_connect(struct pi_adapter *pi)
143{
144	pi->saved_r0 = r0();
145	pi->saved_r2 = r2();
146	w2(0xc); w0(0); w2(0xa);
147	if (pi->mode == 2) {
148		w2(0xc); w0(0x9);
149		w2(0x8); w2(0xc);
150	}
151}
152
153static void fit3_disconnect(struct pi_adapter *pi)
154{
155	w2(0xc); w0(0xa); w2(0x8); w2(0xc);
156	w0(pi->saved_r0);
157	w2(pi->saved_r2);
158}
159
160static void fit3_log_adapter(struct pi_adapter *pi)
161{
162	char *mode_string[3] = { "4-bit", "8-bit", "EPP"};
163
164	dev_info(&pi->dev,
165		 "FIT 3000 adapter at 0x%x, mode %d (%s), delay %d\n",
166		 pi->port, pi->mode, mode_string[pi->mode], pi->delay);
167}
168
169static struct pi_protocol fit3 = {
170	.owner		= THIS_MODULE,
171	.name		= "fit3",
172	.max_mode	= 3,
173	.epp_first	= 2,
174	.default_delay	= 1,
175	.max_units	= 1,
176	.write_regr	= fit3_write_regr,
177	.read_regr	= fit3_read_regr,
178	.write_block	= fit3_write_block,
179	.read_block	= fit3_read_block,
180	.connect	= fit3_connect,
181	.disconnect	= fit3_disconnect,
182	.log_adapter	= fit3_log_adapter,
183};
184
185MODULE_LICENSE("GPL");
186MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
187MODULE_DESCRIPTION("Fidelity International Technology parallel port IDE adapter"
188		   "(newer models) protocol driver");
189module_pata_parport_driver(fit3);