9  * supports 4-bit mode _only_.
24 #define j44(a, b)	(((a >> 4) & 0x0f) | (b & 0xf0))
40 	w2(0xc); w0(regr); w2(4); w0(val); w2(5); w0(0); w2(4);  in fit2_write_regr()
55 	w2(0xc); w0(r); w2(4); w2(5);  in fit2_read_regr()
58 	w2(4);  in fit2_read_regr()
65 	int  k, a, b, c, d;  in fit2_read_block()  local
69 	for (k = 0; k < count / 4; k++) {  in fit2_read_block()
70 		w2(4); w2(5);  in fit2_read_block()
73 		buf[4 * k + 0] = j44(a, b);  in fit2_read_block()
74 		buf[4 * k + 1] = j44(d, c);  in fit2_read_block()
76 		w2(4); w2(5);  in fit2_read_block()
79 		buf[4 * k + 2] = j44(d, c);  in fit2_read_block()
80 		buf[4 * k + 3] = j44(a, b);  in fit2_read_block()
83 	w2(4);  in fit2_read_block()
88 	int k;  in fit2_write_block()  local
91 	for (k = 0; k < count / 2; k++) {  in fit2_write_block()
92 		w2(4); w0(buf[2 * k]);  in fit2_write_block()
93 		w2(5); w0(buf[2 * k + 1]);  in fit2_write_block()
95 	w2(4);  in fit2_write_block()