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
30	gayle_reset = 0x00;
31	while (time_before(jiffies, reset_start_time + 1*HZ/100));
32	READ_ONCE(gayle_reset);
33}
34EXPORT_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
40int 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}
66EXPORT_SYMBOL(pcmcia_copy_tuple);
67
68void 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}
90EXPORT_SYMBOL(pcmcia_program_voltage);
91
92void 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}
108EXPORT_SYMBOL(pcmcia_access_speed);
109
110void pcmcia_write_enable(void)
111{
112	gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
113}
114EXPORT_SYMBOL(pcmcia_write_enable);
115
116void pcmcia_write_disable(void)
117{
118	gayle.cardstatus = 0;
119}
120EXPORT_SYMBOL(pcmcia_write_disable);
121
122