mirror of https://gitee.com/openkylin/linux.git
114 lines
2.3 KiB
C
114 lines
2.3 KiB
C
/*
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** asm-m68k/pcmcia.c -- Amiga Linux PCMCIA support
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** most information was found by disassembling card.resource
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** I'm still looking for an official doc !
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**
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** Copyright 1997 by Alain Malek
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**
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** This file is subject to the terms and conditions of the GNU General Public
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** License. See the file COPYING in the main directory of this archive
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** for more details.
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**
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** Created: 12/10/97 by Alain Malek
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*/
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#include <linux/types.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <asm/amigayle.h>
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#include <asm/amipcmcia.h>
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/* gayle config byte for program voltage and access speed */
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static unsigned char cfg_byte = GAYLE_CFG_0V|GAYLE_CFG_150NS;
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void pcmcia_reset(void)
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{
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unsigned long reset_start_time = jiffies;
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unsigned char b;
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gayle_reset = 0x00;
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while (time_before(jiffies, reset_start_time + 1*HZ/100));
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b = gayle_reset;
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}
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/* copy a tuple, including tuple header. return nb bytes copied */
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/* be carefull as this may trigger a GAYLE_IRQ_WR interrupt ! */
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int pcmcia_copy_tuple(unsigned char tuple_id, void *tuple, int max_len)
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{
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unsigned char id, *dest;
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int cnt, pos, len;
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dest = tuple;
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pos = 0;
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id = gayle_attribute[pos];
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while((id != CISTPL_END) && (pos < 0x10000)) {
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len = (int)gayle_attribute[pos+2] + 2;
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if (id == tuple_id) {
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len = (len > max_len)?max_len:len;
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for (cnt = 0; cnt < len; cnt++) {
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*dest++ = gayle_attribute[pos+(cnt<<1)];
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}
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return len;
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}
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pos += len<<1;
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id = gayle_attribute[pos];
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}
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return 0;
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}
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void pcmcia_program_voltage(int voltage)
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{
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unsigned char v;
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switch (voltage) {
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case PCMCIA_0V:
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v = GAYLE_CFG_0V;
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break;
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case PCMCIA_5V:
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v = GAYLE_CFG_5V;
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break;
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case PCMCIA_12V:
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v = GAYLE_CFG_12V;
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break;
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default:
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v = GAYLE_CFG_0V;
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}
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cfg_byte = (cfg_byte & 0xfc) | v;
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gayle.config = cfg_byte;
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}
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void pcmcia_access_speed(int speed)
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{
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unsigned char s;
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if (speed <= PCMCIA_SPEED_100NS)
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s = GAYLE_CFG_100NS;
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else if (speed <= PCMCIA_SPEED_150NS)
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s = GAYLE_CFG_150NS;
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else if (speed <= PCMCIA_SPEED_250NS)
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s = GAYLE_CFG_250NS;
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else
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s = GAYLE_CFG_720NS;
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cfg_byte = (cfg_byte & 0xf3) | s;
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gayle.config = cfg_byte;
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}
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void pcmcia_write_enable(void)
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{
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gayle.cardstatus = GAYLE_CS_WR|GAYLE_CS_DA;
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}
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void pcmcia_write_disable(void)
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{
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gayle.cardstatus = 0;
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}
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