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 
pcmcia_reset(void)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 
pcmcia_copy_tuple(unsigned char tuple_id,void * tuple,int max_len)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 
pcmcia_program_voltage(int voltage)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 
pcmcia_access_speed(int speed)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 
pcmcia_write_enable(void)111 void pcmcia_write_enable(void)
112 {
113 	gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
114 }
115 EXPORT_SYMBOL(pcmcia_write_enable);
116 
pcmcia_write_disable(void)117 void pcmcia_write_disable(void)
118 {
119 	gayle.cardstatus = 0;
120 }
121 EXPORT_SYMBOL(pcmcia_write_disable);
122 
123