1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * (c) 1997-1998  Grant R. Guenther <grant@torque.net>
5  * on26.c is a low-level protocol driver for the
19  * mode codes:  0  nybble reads, 8-bit writes
20  *		1  8-bit reads and writes
21  *		2  8-bit EPP mode
22  *		3  EPP-16
23  *		4  EPP-32
28 #define P1						      \  macro
39  * cont = 0 - access the IDE register file
40  * cont = 1 - access the IDE command set
49 	switch (pi->mode) {  in on26_read_regr()
51 		w0(1); P1; w0(r); P2; w0(0); P1;  in on26_read_regr()
57 		w0(1); P1; w0(r); P2; w0(0); P1;  in on26_read_regr()
69 	return -1;  in on26_read_regr()
76 	switch (pi->mode) {  in on26_write_regr()
79 		w0(1); P1; w0(r); P2; w0(0); P1;  in on26_write_regr()
104 	pi->saved_r0 = r0();  in on26_connect()
105 	pi->saved_r2 = r2();  in on26_connect()
108 	if (pi->mode)  in on26_connect()
113 	w0(2); P1; w0(8); P2;  in on26_connect()
114 	w0(2); P1; w0(x); P2;  in on26_connect()
119 	if (pi->mode >= 2) {  in on26_disconnect()
122 		w0(4); P1; w0(4); P1;  in on26_disconnect()
125 	w0(pi->saved_r0);  in on26_disconnect()
126 	w2(pi->saved_r2);  in on26_disconnect()
136 	pi->saved_r0 = r0();  in on26_test_port()
137 	pi->saved_r2 = r2();  in on26_test_port()
139 	d = pi->delay;  in on26_test_port()
140 	m = pi->mode;  in on26_test_port()
141 	pi->delay = 5;  in on26_test_port()
142 	pi->mode = 0;  in on26_test_port()
156 		w0(2); P1; w0(0);   P2;  in on26_test_port()
157 		w0(3); P1; w0(0);   P2;  in on26_test_port()
158 		w0(2); P1; w0(8);   P2; udelay(100);  in on26_test_port()
159 		w0(2); P1; w0(0xa); P2; udelay(100);  in on26_test_port()
160 		w0(2); P1; w0(8);   P2; udelay(1000);  in on26_test_port()
175 			dev_err(&pi->dev,  in on26_test_port()
178 		w0(4); P1; w0(4); P1;  in on26_test_port()
183 	pi->delay = d;  in on26_test_port()
184 	pi->mode = m;  in on26_test_port()
185 	w0(pi->saved_r0);  in on26_test_port()
186 	w2(pi->saved_r2);  in on26_test_port()
195 	switch (pi->mode) {  in on26_read_block()
197 		w0(1); P1; w0(1); P2; w0(2); P1; w0(0x18); P2; w0(0); P1;  in on26_read_block()
204 		w0(2); P1; w0(8); P2;  in on26_read_block()
207 		w0(1); P1; w0(1); P2; w0(2); P1; w0(0x19); P2; w0(0); P1;  in on26_read_block()
213 		w0(2); P1; w0(9); P2;  in on26_read_block()
246 	switch (pi->mode) {  in on26_write_block()
249 		w0(1); P1; w0(1); P2;  in on26_write_block()
250 		w0(2); P1; w0(0x18 + pi->mode); P2; w0(0); P1;  in on26_write_block()
257 		w0(2); P1; w0(8 + pi->mode); P2;  in on26_write_block()
288 	char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" };  in on26_log_adapter()
290 	dev_info(&pi->dev,  in on26_log_adapter()
292 		 pi->port, pi->mode, mode_string[pi->mode], pi->delay);  in on26_log_adapter()