1 /*
2 ** asm-m68k/pcmcia.c -- Amiga Linux PCMCIA support
3 ** most information was found by disassembling card.resource
4 ** I'm still looking for an official doc !
5 **
6 ** Copyright 1997 by Alain Malek
7 **
8 ** This file is subject to the terms and conditions of the GNU General Public
9 ** License. See the file COPYING in the main directory of this archive
10 ** for more details.
11 **
12 ** Created: 12/10/97 by Alain Malek
13 */
14
15 #include <linux/types.h>
16 #include <linux/jiffies.h>
17 #include <linux/timer.h>
18 #include <linux/module.h>
19
20 #include <asm/amigayle.h>
21 #include <asm/amipcmcia.h>
22
23 /* gayle config byte for program voltage and access speed */
24 static unsigned char cfg_byte = GAYLE_CFG_0V|GAYLE_CFG_150NS;
25
26 void pcmcia_reset(void)
27 {
28 unsigned long reset_start_time = jiffies;
29
30 gayle_reset = 0x00;
31 while (time_before(jiffies, reset_start_time + 1*HZ/100));
32 READ_ONCE(gayle_reset);
33 }
34 EXPORT_SYMBOL(pcmcia_reset);
35
36
37 /* copy a tuple, including tuple header. return nb bytes copied */
38 /* be careful as this may trigger a GAYLE_IRQ_WR interrupt ! */
39
40 int pcmcia_copy_tuple(unsigned char tuple_id, void *tuple, int max_len)
41 {
42 unsigned char id, *dest;
43 int cnt, pos, len;
44
45 dest = tuple;
46 pos = 0;
47
48 id = gayle_attribute[pos];
49
50 while((id != CISTPL_END) && (pos < 0x10000)) {
51 len = (int)gayle_attribute[pos+2] + 2;
52 if (id == tuple_id) {
53 len = (len > max_len)?max_len:len;
54 for (cnt = 0; cnt < len; cnt++) {
55 *dest++ = gayle_attribute[pos+(cnt<<1)];
56 }
57
58 return len;
59 }
60 pos += len<<1;
61 id = gayle_attribute[pos];
62 }
63
64 return 0;
65 }
66 EXPORT_SYMBOL(pcmcia_copy_tuple);
67
68 void pcmcia_program_voltage(int voltage)
69 {
70 unsigned char v;
71
72 switch (voltage) {
73 case PCMCIA_0V:
74 v = GAYLE_CFG_0V;
75 break;
76 case PCMCIA_5V:
77 v = GAYLE_CFG_5V;
78 break;
79 case PCMCIA_12V:
80 v = GAYLE_CFG_12V;
81 break;
82 default:
83 v = GAYLE_CFG_0V;
84 }
85
86 cfg_byte = (cfg_byte & 0xfc) | v;
87 gayle.config = cfg_byte;
88
89 }
90 EXPORT_SYMBOL(pcmcia_program_voltage);
91
92 void pcmcia_access_speed(int speed)
93 {
94 unsigned char s;
95
96 if (speed <= PCMCIA_SPEED_100NS)
97 s = GAYLE_CFG_100NS;
98 else if (speed <= PCMCIA_SPEED_150NS)
99 s = GAYLE_CFG_150NS;
100 else if (speed <= PCMCIA_SPEED_250NS)
101 s = GAYLE_CFG_250NS;
102 else
103 s = GAYLE_CFG_720NS;
104
105 cfg_byte = (cfg_byte & 0xf3) | s;
106 gayle.config = cfg_byte;
107 }
108 EXPORT_SYMBOL(pcmcia_access_speed);
109
110 void pcmcia_write_enable(void)
111 {
112 gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
113 }
114 EXPORT_SYMBOL(pcmcia_write_enable);
115
116 void pcmcia_write_disable(void)
117 {
118 gayle.cardstatus = 0;
119 }
120 EXPORT_SYMBOL(pcmcia_write_disable);
121
122
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