1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * (c) 1997-1998  Grant R. Guenther <[email protected]>
5  * epia.c is a low-level protocol driver for Shuttle Technologies
22  * mode codes:  0  nybble reads on port 1, 8-bit writes
23  *		1  5/3 reads on ports 1 & 2, 8-bit writes
24  *		2  8-bit reads and writes
25  *		3  8-bit EPP mode
26  *		4  16-bit EPP
27  *		5  32-bit EPP
35  * cont =  1   IDE control registers
45 	switch (pi->mode)  {  in epia_read_regr()
48 		w0(r); w2(1); w2(3); w0(r);  in epia_read_regr()
49 		a = r1(); w2(1); b = r1(); w2(4);  in epia_read_regr()
51 	case 1:  in epia_read_regr()
53 		w0(r); w2(1); w0(r & 0x37);  in epia_read_regr()
59 		w0(r); w2(1); w2(0X21); w2(0x23);  in epia_read_regr()
69 	return -1;  in epia_read_regr()
78 	switch (pi->mode)  {  in epia_write_regr()
80 	case 1:  in epia_write_regr()
83 		w0(r); w2(1); w0(val); w2(3); w2(4);  in epia_write_regr()
98  * The use of register 0x84 is entirely unclear - it seems to control
100  * sizes:  the standard 512 byte reads and writes, 12 byte writes and
105 	pi->saved_r0 = r0();  in epia_connect()
106 	pi->saved_r2 = r2();  in epia_connect()
109 	w2(1); w2(4);  in epia_connect()
110 	if (pi->mode >= 3) {  in epia_connect()
111 		w0(0xa); w2(1); w2(4); w0(0x82); w2(4); w2(0xc); w2(4);  in epia_connect()
120 	w0(pi->saved_r0);  in epia_disconnect()
121 	w2(1); w2(4);  in epia_disconnect()
122 	w0(pi->saved_r0);  in epia_disconnect()
123 	w2(pi->saved_r2);  in epia_disconnect()
131 	switch (pi->mode) {  in epia_read_block()
133 		w0(0x81); w2(1); w2(3); w0(0xc1);  in epia_read_block()
134 		ph = 1;  in epia_read_block()
139 			ph = 1 - ph;  in epia_read_block()
143 	case 1:  in epia_read_block()
144 		w0(0x91); w2(1); w0(0x10); w2(3);  in epia_read_block()
146 		ph = 1;  in epia_read_block()
151 			ph = 1 - ph;  in epia_read_block()
156 		w0(0x89); w2(1); w2(0x23); w2(0x21);  in epia_read_block()
157 		ph = 1;  in epia_read_block()
161 			ph = 1 - ph;  in epia_read_block()
166 		if (count > 512)  in epia_read_block()
174 		if (count > 512)  in epia_read_block()
182 		if (count > 512)  in epia_read_block()
196 	switch (pi->mode) {  in epia_write_block()
198 	case 1:  in epia_write_block()
200 		w0(0xa1); w2(1); w2(3); w2(1); w2(5);  in epia_write_block()
209 			ph = 1 - ph;  in epia_write_block()
214 		if (count < 512)  in epia_write_block()
215 			WR(0x84, 1);  in epia_write_block()
219 		if (count < 512)  in epia_write_block()
223 		if (count < 512)  in epia_write_block()
224 			WR(0x84, 1);  in epia_write_block()
228 		if (count < 512)  in epia_write_block()
232 		if (count < 512)  in epia_write_block()
233 			WR(0x84, 1);  in epia_write_block()
237 		if (count < 512)  in epia_write_block()
247 	char scratch[512];  in epia_test_proto()
258 		WR(2, 1); WR(3, 1);  in epia_test_proto()
265 	epia_read_block(pi, scratch, 512);  in epia_test_proto()
267 		if ((scratch[2 * k] & 0xff) != ((k + 1) & 0xff))  in epia_test_proto()
269 		if ((scratch[2 * k + 1] & 0xff) != ((-2 - k) & 0xff))  in epia_test_proto()
275 	dev_dbg(&pi->dev, "epia: port 0x%x, mode %d, test=(%d,%d,%d)\n",  in epia_test_proto()
276 		pi->port, pi->mode, e[0], e[1], f);  in epia_test_proto()
278 	return (e[0] && e[1]) || f;  in epia_test_proto()
284 	char *mode[6] = { "4-bit", "5/3", "8-bit", "EPP-8", "EPP-16", "EPP-32"};  in epia_log_adapter()
286 	dev_info(&pi->dev,  in epia_log_adapter()
288 		 pi->port, pi->mode, mode[pi->mode], pi->delay);  in epia_log_adapter()
296 	.default_delay	= 1,
297 	.max_units	= 1,