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pcmcia.c
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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  unsigned char b;
30 
31  gayle_reset = 0x00;
32  while (time_before(jiffies, reset_start_time + 1*HZ/100));
33  b = gayle_reset;
34 }
36 
37 
38 /* copy a tuple, including tuple header. return nb bytes copied */
39 /* be careful as this may trigger a GAYLE_IRQ_WR interrupt ! */
40 
41 int pcmcia_copy_tuple(unsigned char tuple_id, void *tuple, int max_len)
42 {
43  unsigned char id, *dest;
44  int cnt, pos, len;
45 
46  dest = tuple;
47  pos = 0;
48 
49  id = gayle_attribute[pos];
50 
51  while((id != CISTPL_END) && (pos < 0x10000)) {
52  len = (int)gayle_attribute[pos+2] + 2;
53  if (id == tuple_id) {
54  len = (len > max_len)?max_len:len;
55  for (cnt = 0; cnt < len; cnt++) {
56  *dest++ = gayle_attribute[pos+(cnt<<1)];
57  }
58 
59  return len;
60  }
61  pos += len<<1;
62  id = gayle_attribute[pos];
63  }
64 
65  return 0;
66 }
68 
69 void pcmcia_program_voltage(int voltage)
70 {
71  unsigned char v;
72 
73  switch (voltage) {
74  case PCMCIA_0V:
75  v = GAYLE_CFG_0V;
76  break;
77  case PCMCIA_5V:
78  v = GAYLE_CFG_5V;
79  break;
80  case PCMCIA_12V:
81  v = GAYLE_CFG_12V;
82  break;
83  default:
84  v = GAYLE_CFG_0V;
85  }
86 
87  cfg_byte = (cfg_byte & 0xfc) | v;
88  gayle.config = cfg_byte;
89 
90 }
92 
93 void pcmcia_access_speed(int speed)
94 {
95  unsigned char s;
96 
97  if (speed <= PCMCIA_SPEED_100NS)
98  s = GAYLE_CFG_100NS;
99  else if (speed <= PCMCIA_SPEED_150NS)
100  s = GAYLE_CFG_150NS;
101  else if (speed <= PCMCIA_SPEED_250NS)
102  s = GAYLE_CFG_250NS;
103  else
104  s = GAYLE_CFG_720NS;
105 
106  cfg_byte = (cfg_byte & 0xf3) | s;
107  gayle.config = cfg_byte;
108 }
110 
112 {
113  gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
114 }
116 
118 {
119  gayle.cardstatus = 0;
120 }
122