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on20.c (c) 1996-8 Grant R. Guenther <grant@torque.net>
Under the terms of the GNU General Public License.
on20.c is a low-level protocol driver for the
Onspec 90c20 parallel to IDE adapter.
*/
/* Changes:
1.01 GRG 1998.05.06 init_proto, release_proto
*/
#define ON20_VERSION "1.01"
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <asm/io.h>
#include "paride.h"
#define op(f) w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);
#define vl(v) w2(4);w0(v);w2(5);w2(7);w2(5);w2(4);
#define j44(a,b) (((a>>4)&0x0f)|(b&0xf0))
/* cont = 0 - access the IDE register file
cont = 1 - access the IDE command set
*/
static int on20_read_regr( PIA *pi, int cont, int regr )
{ int h,l, r ;
r = (regr<<2) + 1 + cont;
op(1); vl(r); op(0);
switch (pi->mode) {
case 0: w2(4); w2(6); l = r1();
w2(4); w2(6); h = r1();
w2(4); w2(6); w2(4); w2(6); w2(4);
return j44(l,h);
case 1: w2(4); w2(0x26); r = r0();
w2(4); w2(0x26); w2(4);
return r;
}
return -1;
}
static void on20_write_regr( PIA *pi, int cont, int regr, int val )
{ int r;
r = (regr<<2) + 1 + cont;
op(1); vl(r);
op(0); vl(val);
op(0); vl(val);
}
static void on20_connect ( PIA *pi)
{ pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(4);w0(0);w2(0xc);w2(4);w2(6);w2(4);w2(6);w2(4);
if (pi->mode) { op(2); vl(8); op(2); vl(9); }
else { op(2); vl(0); op(2); vl(8); }
}
static void on20_disconnect ( PIA *pi )
{ w2(4);w0(7);w2(4);w2(0xc);w2(4);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static void on20_read_block( PIA *pi, char * buf, int count )
{ int k, l, h;
op(1); vl(1); op(0);
for (k=0;k<count;k++)
if (pi->mode) {
w2(4); w2(0x26); buf[k] = r0();
} else {
w2(6); l = r1(); w2(4);
w2(6); h = r1(); w2(4);
buf[k] = j44(l,h);
}
w2(4);
}
static void on20_write_block( PIA *pi, char * buf, int count )
{ int k;
op(1); vl(1); op(0);
for (k=0;k<count;k++) { w2(5); w0(buf[k]); w2(7); }
w2(4);
}
static void on20_log_adapter( PIA *pi, char * scratch, int verbose )
{ char *mode_string[2] = {"4-bit","8-bit"};
printk("%s: on20 %s, OnSpec 90c20 at 0x%x, ",
pi->device,ON20_VERSION,pi->port);
printk("mode %d (%s), delay %d\n",pi->mode,
mode_string[pi->mode],pi->delay);
}
static struct pi_protocol on20 = {
.owner = THIS_MODULE,
.name = "on20",
.max_mode = 2,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = on20_write_regr,
.read_regr = on20_read_regr,
.write_block = on20_write_block,
.read_block = on20_read_block,
.connect = on20_connect,
.disconnect = on20_disconnect,
.log_adapter = on20_log_adapter,
};
static int __init on20_init(void)
{
return paride_register(&on20);
}
static void __exit on20_exit(void)
{
paride_unregister(&on20);
}
MODULE_LICENSE("GPL");
module_init(on20_init)
module_exit(on20_exit)
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