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 pcmcia_reset(void)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 } 34 EXPORT_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 pcmcia_copy_tuple(unsigned char tuple_id,void * tuple,int max_len)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 } 66 EXPORT_SYMBOL(pcmcia_copy_tuple); 67 pcmcia_program_voltage(int voltage)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 } 90 EXPORT_SYMBOL(pcmcia_program_voltage); 91 pcmcia_access_speed(int speed)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 } 108 EXPORT_SYMBOL(pcmcia_access_speed); 109 pcmcia_write_enable(void)110void pcmcia_write_enable(void) 111 { 112 gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA; 113 } 114 EXPORT_SYMBOL(pcmcia_write_enable); 115 pcmcia_write_disable(void)116void pcmcia_write_disable(void) 117 { 118 gayle.cardstatus = 0; 119 } 120 EXPORT_SYMBOL(pcmcia_write_disable); 121 122