2 	on20.c	(c) 1996-8  Grant R. Guenther <grant@torque.net>
5         on20.c is a low-level protocol driver for the
27 #define op(f)	w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);  macro
32 /* cont = 0 - access the IDE register file 
33    cont = 1 - access the IDE command set 
42         op(1); vl(r); op(0);  in on20_read_regr()
44 	switch (pi->mode)  {  in on20_read_regr()
56 	return -1;  in on20_read_regr()
65 	op(1); vl(r);   in on20_write_regr()
66 	op(0); vl(val);   in on20_write_regr()
67 	op(0); vl(val);  in on20_write_regr()
72 {	pi->saved_r0 = r0();  in on20_connect()
73         pi->saved_r2 = r2();  in on20_connect()
76 	if (pi->mode) { op(2); vl(8); op(2); vl(9); }  in on20_connect()
77 	       else   { op(2); vl(0); op(2); vl(8); }  in on20_connect()
83         w0(pi->saved_r0);  in on20_disconnect()
84         w2(pi->saved_r2);  in on20_disconnect()
91 	op(1); vl(1); op(0);  in on20_read_block()
94 	    if (pi->mode) {  in on20_read_block()
108 	op(1); vl(1); op(0);  in on20_write_block()
116 {       char    *mode_string[2] = {"4-bit","8-bit"};  in on20_log_adapter()
119                 pi->device,ON20_VERSION,pi->port);  in on20_log_adapter()
120         printk("mode %d (%s), delay %d\n",pi->mode,  in on20_log_adapter()
121 		mode_string[pi->mode],pi->delay);  in on20_log_adapter()