xref: /linux/arch/m68k/amiga/pcmcia.c (revision 0ea5c948cb64bab5bc7a5516774eb8536f05aa0d)
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 
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 
pcmcia_copy_tuple(unsigned char tuple_id,void * tuple,int max_len)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 
pcmcia_program_voltage(int voltage)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 
pcmcia_access_speed(int speed)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 
pcmcia_write_enable(void)110 void pcmcia_write_enable(void)
111 {
112 	gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
113 }
114 EXPORT_SYMBOL(pcmcia_write_enable);
115 
pcmcia_write_disable(void)116 void pcmcia_write_disable(void)
117 {
118 	gayle.cardstatus = 0;
119 }
120 EXPORT_SYMBOL(pcmcia_write_disable);
121 
122