1 /*
2         ktti.c        (c) 1998  Grant R. Guenther <grant@torque.net>
3                           Under the terms of the GNU General Public License.
4 
5 	ktti.c is a low-level protocol driver for the KT Technology
6 	parallel port adapter.  This adapter is used in the "PHd"
7         portable hard-drives.  As far as I can tell, this device
8 	supports 4-bit mode _only_.
9 
10 */
11 
12 #define KTTI_VERSION      "1.0"
13 
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/wait.h>
20 #include <asm/io.h>
21 
22 #include <linux/pata_parport.h>
23 
24 #define j44(a,b)                (((a>>4)&0x0f)|(b&0xf0))
25 
26 /* cont = 0 - access the IDE register file
27    cont = 1 - access the IDE command set
28 */
29 
30 static int  cont_map[2] = { 0x10, 0x08 };
31 
ktti_write_regr(PIA * pi,int cont,int regr,int val)32 static void  ktti_write_regr( PIA *pi, int cont, int regr, int val)
33 
34 {	int r;
35 
36 	r = regr + cont_map[cont];
37 
38 	w0(r); w2(0xb); w2(0xa); w2(3); w2(6);
39 	w0(val); w2(3); w0(0); w2(6); w2(0xb);
40 }
41 
ktti_read_regr(PIA * pi,int cont,int regr)42 static int ktti_read_regr( PIA *pi, int cont, int regr )
43 
44 {	int  a, b, r;
45 
46         r = regr + cont_map[cont];
47 
48         w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
49 	a = r1(); w2(0xc);  b = r1(); w2(9); w2(0xc); w2(9);
50 	return j44(a,b);
51 
52 }
53 
ktti_read_block(PIA * pi,char * buf,int count)54 static void ktti_read_block( PIA *pi, char * buf, int count )
55 
56 {	int  k, a, b;
57 
58 	for (k=0;k<count/2;k++) {
59 		w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
60 		a = r1(); w2(0xc); b = r1(); w2(9);
61 		buf[2*k] = j44(a,b);
62 		a = r1(); w2(0xc); b = r1(); w2(9);
63 		buf[2*k+1] = j44(a,b);
64 	}
65 }
66 
ktti_write_block(PIA * pi,char * buf,int count)67 static void ktti_write_block( PIA *pi, char * buf, int count )
68 
69 {	int k;
70 
71 	for (k=0;k<count/2;k++) {
72 		w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);
73 		w0(buf[2*k]); w2(3);
74 		w0(buf[2*k+1]); w2(6);
75 		w2(0xb);
76 	}
77 }
78 
ktti_connect(PIA * pi)79 static void ktti_connect ( PIA *pi  )
80 
81 {       pi->saved_r0 = r0();
82         pi->saved_r2 = r2();
83 	w2(0xb); w2(0xa); w0(0); w2(3); w2(6);
84 }
85 
ktti_disconnect(PIA * pi)86 static void ktti_disconnect ( PIA *pi )
87 
88 {       w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);
89 	w0(pi->saved_r0);
90         w2(pi->saved_r2);
91 }
92 
ktti_log_adapter(PIA * pi,char * scratch,int verbose)93 static void ktti_log_adapter( PIA *pi, char * scratch, int verbose )
94 
95 {       printk("%s: ktti %s, KT adapter at 0x%x, delay %d\n",
96                 pi->device,KTTI_VERSION,pi->port,pi->delay);
97 
98 }
99 
100 static struct pi_protocol ktti = {
101 	.owner		= THIS_MODULE,
102 	.name		= "ktti",
103 	.max_mode	= 1,
104 	.epp_first	= 2,
105 	.default_delay	= 1,
106 	.max_units	= 1,
107 	.write_regr	= ktti_write_regr,
108 	.read_regr	= ktti_read_regr,
109 	.write_block	= ktti_write_block,
110 	.read_block	= ktti_read_block,
111 	.connect	= ktti_connect,
112 	.disconnect	= ktti_disconnect,
113 	.log_adapter	= ktti_log_adapter,
114 };
115 
ktti_init(void)116 static int __init ktti_init(void)
117 {
118 	return paride_register(&ktti);
119 }
120 
ktti_exit(void)121 static void __exit ktti_exit(void)
122 {
123 	paride_unregister(&ktti);
124 }
125 
126 MODULE_LICENSE("GPL");
127 module_init(ktti_init)
128 module_exit(ktti_exit)
129