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 */
24static unsigned char cfg_byte = GAYLE_CFG_0V|GAYLE_CFG_150NS;
25
26void 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}
35EXPORT_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
41int 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}
67EXPORT_SYMBOL(pcmcia_copy_tuple);
68
69void 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}
91EXPORT_SYMBOL(pcmcia_program_voltage);
92
93void 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}
109EXPORT_SYMBOL(pcmcia_access_speed);
110
111void pcmcia_write_enable(void)
112{
113	gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
114}
115EXPORT_SYMBOL(pcmcia_write_enable);
116
117void pcmcia_write_disable(void)
118{
119	gayle.cardstatus = 0;
120}
121EXPORT_SYMBOL(pcmcia_write_disable);
122
123