Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/block/paride/fit2.c
15112 views
1
/* 

2
        fit2.c        (c) 1998  Grant R. Guenther <[email protected]>

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


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


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


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


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


103
static void fit2_connect ( PIA *pi  )

104


105
{       pi->saved_r0 = r0();

106
        pi->saved_r2 = r2();

107
	w2(0xcc); 

108
}

109


110
static void fit2_disconnect ( PIA *pi )

111


112
{       w0(pi->saved_r0);

113
        w2(pi->saved_r2);

114
} 

115


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


139
static int __init fit2_init(void)

140
{

141
	return paride_register(&fit2);

142
}

143


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


153