1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * ktti.c is a low-level protocol driver for the KT Technology
7  * portable hard-drives.  As far as I can tell, this device
8  * supports 4-bit mode _only_.
20 #define j44(a, b)	(((a >> 4) & 0x0f) | (b & 0xf0))  argument
23  * cont = 0 - access the IDE register file
24  * cont = 1 - access the IDE command set
26 static int cont_map[2] = { 0x10, 0x08 };
32 	w0(r); w2(0xb); w2(0xa); w2(3); w2(6);  in ktti_write_regr()
33 	w0(val); w2(3); w0(0); w2(6); w2(0xb);  in ktti_write_regr()
38 	int a, b, r;  in ktti_read_regr()  local
42 	w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);  in ktti_read_regr()
43 	a = r1(); w2(0xc);  b = r1(); w2(9); w2(0xc); w2(9);  in ktti_read_regr()
44 	return j44(a, b);  in ktti_read_regr()
49 	int k, a, b;  in ktti_read_block()  local
51 	for (k = 0; k < count / 2; k++) {  in ktti_read_block()
52 		w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);  in ktti_read_block()
53 		a = r1(); w2(0xc); b = r1(); w2(9);  in ktti_read_block()
54 		buf[2*k] = j44(a, b);  in ktti_read_block()
55 		a = r1(); w2(0xc); b = r1(); w2(9);  in ktti_read_block()
56 		buf[2*k+1] = j44(a, b);  in ktti_read_block()
64 	for (k = 0; k < count / 2; k++) {  in ktti_write_block()
65 		w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);  in ktti_write_block()
68 		w2(0xb);  in ktti_write_block()
74 	pi->saved_r0 = r0();  in ktti_connect()
75 	pi->saved_r2 = r2();  in ktti_connect()
76 	w2(0xb); w2(0xa); w0(0); w2(3); w2(6);  in ktti_connect()
81 	w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);  in ktti_disconnect()
82 	w0(pi->saved_r0);  in ktti_disconnect()
83 	w2(pi->saved_r2);  in ktti_disconnect()
88 	dev_info(&pi->dev, "KT adapter at 0x%x, delay %d\n",  in ktti_log_adapter()
89 		 pi->port, pi->delay);  in ktti_log_adapter()