arch/m68k/amiga/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 */
  24 static unsigned char cfg_byte = GAYLE_CFG_0V|GAYLE_CFG_150NS;
  25
  26 void 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 }
  35 EXPORT_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
  41 int 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 }
  67 EXPORT_SYMBOL(pcmcia_copy_tuple);
  68
  69 void 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 }
  91 EXPORT_SYMBOL(pcmcia_program_voltage);
  92
  93 void 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 }
 109 EXPORT_SYMBOL(pcmcia_access_speed);
 110
 111 void pcmcia_write_enable(void)
 112 {
 113         gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
 114 }
 115 EXPORT_SYMBOL(pcmcia_write_enable);
 116
 117 void pcmcia_write_disable(void)
 118 {
 119         gayle.cardstatus = 0;
 120 }
 121 EXPORT_SYMBOL(pcmcia_write_disable);
 122