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 <asm/amigayle.h> 19 #include <asm/amipcmcia.h> 20 21 /* gayle config byte for program voltage and access speed */ 22 static unsigned char cfg_byte = GAYLE_CFG_0V|GAYLE_CFG_150NS; 23 24 void pcmcia_reset(void) 25 { 26 unsigned long reset_start_time = jiffies; 27 unsigned char b; 28 29 gayle_reset = 0x00; 30 while (time_before(jiffies, reset_start_time + 1*HZ/100)); 31 b = gayle_reset; 32 } 33 34 35 /* copy a tuple, including tuple header. return nb bytes copied */ 36 /* be careful as this may trigger a GAYLE_IRQ_WR interrupt ! */ 37 38 int pcmcia_copy_tuple(unsigned char tuple_id, void *tuple, int max_len) 39 { 40 unsigned char id, *dest; 41 int cnt, pos, len; 42 43 dest = tuple; 44 pos = 0; 45 46 id = gayle_attribute[pos]; 47 48 while((id != CISTPL_END) && (pos < 0x10000)) { 49 len = (int)gayle_attribute[pos+2] + 2; 50 if (id == tuple_id) { 51 len = (len > max_len)?max_len:len; 52 for (cnt = 0; cnt < len; cnt++) { 53 *dest++ = gayle_attribute[pos+(cnt<<1)]; 54 } 55 56 return len; 57 } 58 pos += len<<1; 59 id = gayle_attribute[pos]; 60 } 61 62 return 0; 63 } 64 65 void pcmcia_program_voltage(int voltage) 66 { 67 unsigned char v; 68 69 switch (voltage) { 70 case PCMCIA_0V: 71 v = GAYLE_CFG_0V; 72 break; 73 case PCMCIA_5V: 74 v = GAYLE_CFG_5V; 75 break; 76 case PCMCIA_12V: 77 v = GAYLE_CFG_12V; 78 break; 79 default: 80 v = GAYLE_CFG_0V; 81 } 82 83 cfg_byte = (cfg_byte & 0xfc) | v; 84 gayle.config = cfg_byte; 85 86 } 87 88 void pcmcia_access_speed(int speed) 89 { 90 unsigned char s; 91 92 if (speed <= PCMCIA_SPEED_100NS) 93 s = GAYLE_CFG_100NS; 94 else if (speed <= PCMCIA_SPEED_150NS) 95 s = GAYLE_CFG_150NS; 96 else if (speed <= PCMCIA_SPEED_250NS) 97 s = GAYLE_CFG_250NS; 98 else 99 s = GAYLE_CFG_720NS; 100 101 cfg_byte = (cfg_byte & 0xf3) | s; 102 gayle.config = cfg_byte; 103 } 104 105 void pcmcia_write_enable(void) 106 { 107 gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA; 108 } 109 110 void pcmcia_write_disable(void) 111 { 112 gayle.cardstatus = 0; 113 } 114