163 lines
3.3 KiB
C
163 lines
3.3 KiB
C
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/*
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aten.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
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Under the terms of the GNU General Public License.
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aten.c is a low-level protocol driver for the ATEN EH-100
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parallel port adapter. The EH-100 supports 4-bit and 8-bit
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modes only. There is also an EH-132 which supports EPP mode
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transfers. The EH-132 is not yet supported.
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*/
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/* Changes:
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1.01 GRG 1998.05.05 init_proto, release_proto
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*/
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#define ATEN_VERSION "1.01"
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/wait.h>
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#include <linux/types.h>
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#include <asm/io.h>
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#include <linux/pata_parport.h>
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#define j44(a,b) ((((a>>4)&0x0f)|(b&0xf0))^0x88)
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/* cont = 0 - access the IDE register file
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cont = 1 - access the IDE command set
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*/
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static int cont_map[2] = { 0x08, 0x20 };
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static void aten_write_regr( PIA *pi, int cont, int regr, int val)
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{ int r;
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r = regr + cont_map[cont] + 0x80;
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w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);
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}
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static int aten_read_regr( PIA *pi, int cont, int regr )
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{ int a, b, r;
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r = regr + cont_map[cont] + 0x40;
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switch (pi->mode) {
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case 0: w0(r); w2(0xe); w2(6);
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w2(7); w2(6); w2(0);
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a = r1(); w0(0x10); b = r1(); w2(0xc);
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return j44(a,b);
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case 1: r |= 0x10;
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w0(r); w2(0xe); w2(6); w0(0xff);
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w2(0x27); w2(0x26); w2(0x20);
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a = r0();
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w2(0x26); w2(0xc);
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return a;
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}
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return -1;
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}
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static void aten_read_block( PIA *pi, char * buf, int count )
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{ int k, a, b, c, d;
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switch (pi->mode) {
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case 0: w0(0x48); w2(0xe); w2(6);
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for (k=0;k<count/2;k++) {
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w2(7); w2(6); w2(2);
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a = r1(); w0(0x58); b = r1();
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w2(0); d = r1(); w0(0x48); c = r1();
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buf[2*k] = j44(c,d);
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buf[2*k+1] = j44(a,b);
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}
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w2(0xc);
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break;
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case 1: w0(0x58); w2(0xe); w2(6);
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for (k=0;k<count/2;k++) {
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w2(0x27); w2(0x26); w2(0x22);
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a = r0(); w2(0x20); b = r0();
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buf[2*k] = b; buf[2*k+1] = a;
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}
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w2(0x26); w2(0xc);
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break;
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}
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}
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static void aten_write_block( PIA *pi, char * buf, int count )
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{ int k;
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w0(0x88); w2(0xe); w2(6);
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for (k=0;k<count/2;k++) {
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w0(buf[2*k+1]); w2(0xe); w2(6);
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w0(buf[2*k]); w2(7); w2(6);
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}
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w2(0xc);
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}
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static void aten_connect ( PIA *pi )
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{ pi->saved_r0 = r0();
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pi->saved_r2 = r2();
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w2(0xc);
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}
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static void aten_disconnect ( PIA *pi )
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{ w0(pi->saved_r0);
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w2(pi->saved_r2);
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}
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static void aten_log_adapter( PIA *pi, char * scratch, int verbose )
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{ char *mode_string[2] = {"4-bit","8-bit"};
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printk("%s: aten %s, ATEN EH-100 at 0x%x, ",
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pi->device,ATEN_VERSION,pi->port);
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printk("mode %d (%s), delay %d\n",pi->mode,
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mode_string[pi->mode],pi->delay);
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}
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static struct pi_protocol aten = {
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.owner = THIS_MODULE,
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.name = "aten",
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.max_mode = 2,
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.epp_first = 2,
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.default_delay = 1,
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.max_units = 1,
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.write_regr = aten_write_regr,
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.read_regr = aten_read_regr,
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.write_block = aten_write_block,
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.read_block = aten_read_block,
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.connect = aten_connect,
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.disconnect = aten_disconnect,
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.log_adapter = aten_log_adapter,
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};
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static int __init aten_init(void)
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{
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return paride_register(&aten);
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}
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static void __exit aten_exit(void)
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{
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paride_unregister( &aten );
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}
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MODULE_LICENSE("GPL");
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module_init(aten_init)
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module_exit(aten_exit)
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