m68k/amiga: Reclaim Chip RAM for PPC exception handlers
[linux-3.10.git] / arch / m68k / amiga / pcmcia.c
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 }
35 EXPORT_SYMBOL(pcmcia_reset);
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 }
67 EXPORT_SYMBOL(pcmcia_copy_tuple);
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 }
91 EXPORT_SYMBOL(pcmcia_program_voltage);
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 }
109 EXPORT_SYMBOL(pcmcia_access_speed);
110
111 void pcmcia_write_enable(void)
112 {
113         gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
114 }
115 EXPORT_SYMBOL(pcmcia_write_enable);
116
117 void pcmcia_write_disable(void)
118 {
119         gayle.cardstatus = 0;
120 }
121 EXPORT_SYMBOL(pcmcia_write_disable);
122