234 lines
5.0 KiB
C
234 lines
5.0 KiB
C
/*
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dstr.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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dstr.c is a low-level protocol driver for the
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DataStor EP2000 parallel to IDE adapter chip.
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*/
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/* Changes:
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1.01 GRG 1998.05.06 init_proto, release_proto
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*/
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#define DSTR_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/types.h>
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#include <linux/wait.h>
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#include <asm/io.h>
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#include "paride.h"
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/* mode codes: 0 nybble reads, 8-bit writes
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1 8-bit reads and writes
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2 8-bit EPP mode
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3 EPP-16
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4 EPP-32
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*/
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#define j44(a,b) (((a>>3)&0x07)|((~a>>4)&0x08)|((b<<1)&0x70)|((~b)&0x80))
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#define P1 w2(5);w2(0xd);w2(5);w2(4);
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#define P2 w2(5);w2(7);w2(5);w2(4);
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#define P3 w2(6);w2(4);w2(6);w2(4);
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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] = { 0x20, 0x40 };
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static int dstr_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];
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w0(0x81); P1;
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if (pi->mode) { w0(0x11); } else { w0(1); }
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P2; w0(r); P1;
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switch (pi->mode) {
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case 0: w2(6); a = r1(); w2(4); w2(6); b = r1(); w2(4);
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return j44(a,b);
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case 1: w0(0); w2(0x26); a = r0(); w2(4);
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return a;
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case 2:
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case 3:
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case 4: w2(0x24); a = r4(); w2(4);
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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 dstr_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];
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w0(0x81); P1;
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if (pi->mode >= 2) { w0(0x11); } else { w0(1); }
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P2; w0(r); P1;
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switch (pi->mode) {
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case 0:
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case 1: w0(val); w2(5); w2(7); w2(5); w2(4);
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break;
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case 2:
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case 3:
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case 4: w4(val);
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break;
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}
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}
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#define CCP(x) w0(0xff);w2(0xc);w2(4);\
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w0(0xaa);w0(0x55);w0(0);w0(0xff);w0(0x87);w0(0x78);\
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w0(x);w2(5);w2(4);
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static void dstr_connect ( PIA *pi )
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{ pi->saved_r0 = r0();
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pi->saved_r2 = r2();
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w2(4); CCP(0xe0); w0(0xff);
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}
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static void dstr_disconnect ( PIA *pi )
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{ CCP(0x30);
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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 dstr_read_block( PIA *pi, char * buf, int count )
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{ int k, a, b;
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w0(0x81); P1;
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if (pi->mode) { w0(0x19); } else { w0(9); }
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P2; w0(0x82); P1; P3; w0(0x20); P1;
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switch (pi->mode) {
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case 0: for (k=0;k<count;k++) {
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w2(6); a = r1(); w2(4);
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w2(6); b = r1(); w2(4);
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buf[k] = j44(a,b);
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}
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break;
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case 1: w0(0);
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for (k=0;k<count;k++) {
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w2(0x26); buf[k] = r0(); w2(0x24);
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}
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w2(4);
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break;
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case 2: w2(0x24);
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for (k=0;k<count;k++) buf[k] = r4();
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w2(4);
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break;
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case 3: w2(0x24);
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for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w();
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w2(4);
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break;
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case 4: w2(0x24);
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for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l();
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w2(4);
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break;
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}
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}
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static void dstr_write_block( PIA *pi, char * buf, int count )
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{ int k;
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w0(0x81); P1;
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if (pi->mode) { w0(0x19); } else { w0(9); }
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P2; w0(0x82); P1; P3; w0(0x20); P1;
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switch (pi->mode) {
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case 0:
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case 1: for (k=0;k<count;k++) {
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w2(5); w0(buf[k]); w2(7);
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}
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w2(5); w2(4);
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break;
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case 2: w2(0xc5);
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for (k=0;k<count;k++) w4(buf[k]);
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w2(0xc4);
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break;
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case 3: w2(0xc5);
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for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
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w2(0xc4);
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break;
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case 4: w2(0xc5);
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for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
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w2(0xc4);
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break;
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}
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}
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static void dstr_log_adapter( PIA *pi, char * scratch, int verbose )
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{ char *mode_string[5] = {"4-bit","8-bit","EPP-8",
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"EPP-16","EPP-32"};
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printk("%s: dstr %s, DataStor EP2000 at 0x%x, ",
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pi->device,DSTR_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 dstr = {
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.owner = THIS_MODULE,
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.name = "dstr",
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.max_mode = 5,
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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 = dstr_write_regr,
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.read_regr = dstr_read_regr,
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.write_block = dstr_write_block,
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.read_block = dstr_read_block,
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.connect = dstr_connect,
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.disconnect = dstr_disconnect,
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.log_adapter = dstr_log_adapter,
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};
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static int __init dstr_init(void)
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{
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return paride_register(&dstr);
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}
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static void __exit dstr_exit(void)
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{
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paride_unregister(&dstr);
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}
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MODULE_LICENSE("GPL");
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module_init(dstr_init)
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module_exit(dstr_exit)
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