1 /*
2 fit2.c (c) 1998 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
4
5 fit2.c is a low-level protocol driver for the older version
6 of the Fidelity International Technology parallel port adapter.
7 This adapter is used in their TransDisk 2000 and older TransDisk
8 3000 portable hard-drives. As far as I can tell, this device
9 supports 4-bit mode _only_.
10
11 Newer models of the FIT products use an enhanced protocol.
12 The "fit3" protocol module should support current drives.
13
14 */
15
16 #define FIT2_VERSION "1.0"
17
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/delay.h>
21 #include <linux/kernel.h>
22 #include <linux/types.h>
23 #include <linux/wait.h>
24 #include <asm/io.h>
25
26 #include "paride.h"
27
28 #define j44(a,b) (((a>>4)&0x0f)|(b&0xf0))
29
30 /* cont = 0 - access the IDE register file
31 cont = 1 - access the IDE command set
32
33 NB: The FIT adapter does not appear to use the control registers.
34 So, we map ALT_STATUS to STATUS and NO-OP writes to the device
35 control register - this means that IDE reset will not work on these
36 devices.
37
38 */
39
fit2_write_regr(PIA * pi,int cont,int regr,int val)40 static void fit2_write_regr( PIA *pi, int cont, int regr, int val)
41
42 { if (cont == 1) return;
43 w2(0xc); w0(regr); w2(4); w0(val); w2(5); w0(0); w2(4);
44 }
45
fit2_read_regr(PIA * pi,int cont,int regr)46 static int fit2_read_regr( PIA *pi, int cont, int regr )
47
48 { int a, b, r;
49
50 if (cont) {
51 if (regr != 6) return 0xff;
52 r = 7;
53 } else r = regr + 0x10;
54
55 w2(0xc); w0(r); w2(4); w2(5);
56 w0(0); a = r1();
57 w0(1); b = r1();
58 w2(4);
59
60 return j44(a,b);
61
62 }
63
fit2_read_block(PIA * pi,char * buf,int count)64 static void fit2_read_block( PIA *pi, char * buf, int count )
65
66 { int k, a, b, c, d;
67
68 w2(0xc); w0(0x10);
69
70 for (k=0;k<count/4;k++) {
71
72 w2(4); w2(5);
73 w0(0); a = r1(); w0(1); b = r1();
74 w0(3); c = r1(); w0(2); d = r1();
75 buf[4*k+0] = j44(a,b);
76 buf[4*k+1] = j44(d,c);
77
78 w2(4); w2(5);
79 a = r1(); w0(3); b = r1();
80 w0(1); c = r1(); w0(0); d = r1();
81 buf[4*k+2] = j44(d,c);
82 buf[4*k+3] = j44(a,b);
83
84 }
85
86 w2(4);
87
88 }
89
fit2_write_block(PIA * pi,char * buf,int count)90 static void fit2_write_block( PIA *pi, char * buf, int count )
91
92 { int k;
93
94
95 w2(0xc); w0(0);
96 for (k=0;k<count/2;k++) {
97 w2(4); w0(buf[2*k]);
98 w2(5); w0(buf[2*k+1]);
99 }
100 w2(4);
101 }
102
fit2_connect(PIA * pi)103 static void fit2_connect ( PIA *pi )
104
105 { pi->saved_r0 = r0();
106 pi->saved_r2 = r2();
107 w2(0xcc);
108 }
109
fit2_disconnect(PIA * pi)110 static void fit2_disconnect ( PIA *pi )
111
112 { w0(pi->saved_r0);
113 w2(pi->saved_r2);
114 }
115
fit2_log_adapter(PIA * pi,char * scratch,int verbose)116 static void fit2_log_adapter( PIA *pi, char * scratch, int verbose )
117
118 { printk("%s: fit2 %s, FIT 2000 adapter at 0x%x, delay %d\n",
119 pi->device,FIT2_VERSION,pi->port,pi->delay);
120
121 }
122
123 static struct pi_protocol fit2 = {
124 .owner = THIS_MODULE,
125 .name = "fit2",
126 .max_mode = 1,
127 .epp_first = 2,
128 .default_delay = 1,
129 .max_units = 1,
130 .write_regr = fit2_write_regr,
131 .read_regr = fit2_read_regr,
132 .write_block = fit2_write_block,
133 .read_block = fit2_read_block,
134 .connect = fit2_connect,
135 .disconnect = fit2_disconnect,
136 .log_adapter = fit2_log_adapter,
137 };
138
fit2_init(void)139 static int __init fit2_init(void)
140 {
141 return paride_register(&fit2);
142 }
143
fit2_exit(void)144 static void __exit fit2_exit(void)
145 {
146 paride_unregister(&fit2);
147 }
148
149 MODULE_LICENSE("GPL");
150 module_init(fit2_init)
151 module_exit(fit2_exit)
152