pcmcia.c

  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