pcmcia.c
2.5 KB
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/*
** asm-m68k/pcmcia.c -- Amiga Linux PCMCIA support
** most information was found by disassembling card.resource
** I'm still looking for an official doc !
**
** Copyright 1997 by Alain Malek
**
** This file is subject to the terms and conditions of the GNU General Public
** License. See the file COPYING in the main directory of this archive
** for more details.
**
** Created: 12/10/97 by Alain Malek
*/
#include <linux/types.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/module.h>
#include <asm/amigayle.h>
#include <asm/amipcmcia.h>
/* gayle config byte for program voltage and access speed */
static unsigned char cfg_byte = GAYLE_CFG_0V|GAYLE_CFG_150NS;
void pcmcia_reset(void)
{
unsigned long reset_start_time = jiffies;
unsigned char b;
gayle_reset = 0x00;
while (time_before(jiffies, reset_start_time + 1*HZ/100));
b = gayle_reset;
}
EXPORT_SYMBOL(pcmcia_reset);
/* copy a tuple, including tuple header. return nb bytes copied */
/* be careful as this may trigger a GAYLE_IRQ_WR interrupt ! */
int pcmcia_copy_tuple(unsigned char tuple_id, void *tuple, int max_len)
{
unsigned char id, *dest;
int cnt, pos, len;
dest = tuple;
pos = 0;
id = gayle_attribute[pos];
while((id != CISTPL_END) && (pos < 0x10000)) {
len = (int)gayle_attribute[pos+2] + 2;
if (id == tuple_id) {
len = (len > max_len)?max_len:len;
for (cnt = 0; cnt < len; cnt++) {
*dest++ = gayle_attribute[pos+(cnt<<1)];
}
return len;
}
pos += len<<1;
id = gayle_attribute[pos];
}
return 0;
}
EXPORT_SYMBOL(pcmcia_copy_tuple);
void pcmcia_program_voltage(int voltage)
{
unsigned char v;
switch (voltage) {
case PCMCIA_0V:
v = GAYLE_CFG_0V;
break;
case PCMCIA_5V:
v = GAYLE_CFG_5V;
break;
case PCMCIA_12V:
v = GAYLE_CFG_12V;
break;
default:
v = GAYLE_CFG_0V;
}
cfg_byte = (cfg_byte & 0xfc) | v;
gayle.config = cfg_byte;
}
EXPORT_SYMBOL(pcmcia_program_voltage);
void pcmcia_access_speed(int speed)
{
unsigned char s;
if (speed <= PCMCIA_SPEED_100NS)
s = GAYLE_CFG_100NS;
else if (speed <= PCMCIA_SPEED_150NS)
s = GAYLE_CFG_150NS;
else if (speed <= PCMCIA_SPEED_250NS)
s = GAYLE_CFG_250NS;
else
s = GAYLE_CFG_720NS;
cfg_byte = (cfg_byte & 0xf3) | s;
gayle.config = cfg_byte;
}
EXPORT_SYMBOL(pcmcia_access_speed);
void pcmcia_write_enable(void)
{
gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
}
EXPORT_SYMBOL(pcmcia_write_enable);
void pcmcia_write_disable(void)
{
gayle.cardstatus = 0;
}
EXPORT_SYMBOL(pcmcia_write_disable);