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pcmcia.c

/*
** 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 <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;
}


/* 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;
}

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;

}

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;
}

void pcmcia_write_enable(void)
{
      gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
}

void pcmcia_write_disable(void)
{
      gayle.cardstatus = 0;
}

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