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 */
22static unsigned char cfg_byte = GAYLE_CFG_0V|GAYLE_CFG_150NS;
23
24void 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
38int 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
65void 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
88void 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
105void pcmcia_write_enable(void)
106{
107	gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
108}
109
110void pcmcia_write_disable(void)
111{
112	gayle.cardstatus = 0;
113}
114