- /*
- ** 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/sched.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 carefull 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;
- }