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/sched.h>
17 #include <linux/timer.h>
18 #include <asm/amigayle.h>
19 #include <asm/amipcmcia.h>
20 
21 /* gayle config byte for program voltage and access speed */
22 static unsigned char cfg_byte = GAYLE_CFG_0V|GAYLE_CFG_150NS;
23 
pcmcia_reset(void)24 void pcmcia_reset(void)
25 {
26 	unsigned long reset_start_time = jiffies;
27 	unsigned char b;
28 
29 	gayle_reset = 0x00;
30 	while (time_before(jiffies, reset_start_time + 1*HZ/100));
31 	b = gayle_reset;
32 }
33 
34 
35 /* copy a tuple, including tuple header. return nb bytes copied */
36 /* be carefull as this may trigger a GAYLE_IRQ_WR interrupt ! */
37 
pcmcia_copy_tuple(unsigned char tuple_id,void * tuple,int max_len)38 int pcmcia_copy_tuple(unsigned char tuple_id, void *tuple, int max_len)
39 {
40 	unsigned char id, *dest;
41 	int cnt, pos, len;
42 
43 	dest = tuple;
44 	pos = 0;
45 
46 	id = gayle_attribute[pos];
47 
48 	while((id != CISTPL_END) && (pos < 0x10000)) {
49 		len = (int)gayle_attribute[pos+2] + 2;
50 		if (id == tuple_id) {
51 			len = (len > max_len)?max_len:len;
52 			for (cnt = 0; cnt < len; cnt++) {
53 				*dest++ = gayle_attribute[pos+(cnt<<1)];
54 			}
55 
56 			return len;
57 		}
58 		pos += len<<1;
59 		id = gayle_attribute[pos];
60 	}
61 
62 	return 0;
63 }
64 
pcmcia_program_voltage(int voltage)65 void pcmcia_program_voltage(int voltage)
66 {
67 	unsigned char v;
68 
69 	switch (voltage) {
70 	case PCMCIA_0V:
71 		v = GAYLE_CFG_0V;
72 		break;
73 	case PCMCIA_5V:
74 		v = GAYLE_CFG_5V;
75 		break;
76 	case PCMCIA_12V:
77 		v = GAYLE_CFG_12V;
78 		break;
79 	default:
80 		v = GAYLE_CFG_0V;
81 	}
82 
83 	cfg_byte = (cfg_byte & 0xfc) | v;
84 	gayle.config = cfg_byte;
85 
86 }
87 
pcmcia_access_speed(int speed)88 void pcmcia_access_speed(int speed)
89 {
90 	unsigned char s;
91 
92 	if (speed <= PCMCIA_SPEED_100NS)
93 		s = GAYLE_CFG_100NS;
94 	else if (speed <= PCMCIA_SPEED_150NS)
95 		s = GAYLE_CFG_150NS;
96 	else if (speed <= PCMCIA_SPEED_250NS)
97 		s = GAYLE_CFG_250NS;
98 	else
99 		s = GAYLE_CFG_720NS;
100 
101 	cfg_byte = (cfg_byte & 0xf3) | s;
102 	gayle.config = cfg_byte;
103 }
104 
pcmcia_write_enable(void)105 void pcmcia_write_enable(void)
106 {
107 	gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
108 }
109 
pcmcia_write_disable(void)110 void pcmcia_write_disable(void)
111 {
112 	gayle.cardstatus = 0;
113 }
114