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/*
on26.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
Under the terms of the GNU General Public License.
on26.c is a low-level protocol driver for the
OnSpec 90c26 parallel to IDE adapter chip.
*/
/* Changes:
1.01 GRG 1998.05.06 init_proto, release_proto
1.02 GRG 1998.09.23 updates for the -E rev chip
1.03 GRG 1998.12.14 fix for slave drives
1.04 GRG 1998.12.20 yet another bug fix
*/
#define ON26_VERSION "1.04"
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <asm/io.h>
#include "paride.h"
/* mode codes: 0 nybble reads, 8-bit writes
1 8-bit reads and writes
2 8-bit EPP mode
3 EPP-16
4 EPP-32
*/
#define j44(a,b) (((a>>4)&0x0f)|(b&0xf0))
#define P1 w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);
#define P2 w2(5);w2(7);w2(5);w2(4);
/* cont = 0 - access the IDE register file
cont = 1 - access the IDE command set
*/
static int on26_read_regr( PIA *pi, int cont, int regr )
{ int a, b, r;
r = (regr<<2) + 1 + cont;
switch (pi->mode) {
case 0: w0(1); P1; w0(r); P2; w0(0); P1;
w2(6); a = r1(); w2(4);
w2(6); b = r1(); w2(4);
w2(6); w2(4); w2(6); w2(4);
return j44(a,b);
case 1: w0(1); P1; w0(r); P2; w0(0); P1;
w2(0x26); a = r0(); w2(4); w2(0x26); w2(4);
return a;
case 2:
case 3:
case 4: w3(1); w3(1); w2(5); w4(r); w2(4);
w3(0); w3(0); w2(0x24); a = r4(); w2(4);
w2(0x24); r4(); w2(4);
return a;
}
return -1;
}
static void on26_write_regr( PIA *pi, int cont, int regr, int val )
{ int r;
r = (regr<<2) + 1 + cont;
switch (pi->mode) {
case 0:
case 1: w0(1); P1; w0(r); P2; w0(0); P1;
w0(val); P2; w0(val); P2;
break;
case 2:
case 3:
case 4: w3(1); w3(1); w2(5); w4(r); w2(4);
w3(0); w3(0);
w2(5); w4(val); w2(4);
w2(5); w4(val); w2(4);
break;
}
}
#define CCP(x) w0(0xfe);w0(0xaa);w0(0x55);w0(0);w0(0xff);\
w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff);
static void on26_connect ( PIA *pi )
{ int x;
pi->saved_r0 = r0();
pi->saved_r2 = r2();
CCP(0x20);
x = 8; if (pi->mode) x = 9;
w0(2); P1; w0(8); P2;
w0(2); P1; w0(x); P2;
}
static void on26_disconnect ( PIA *pi )
{ if (pi->mode >= 2) { w3(4); w3(4); w3(4); w3(4); }
else { w0(4); P1; w0(4); P1; }
CCP(0x30);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
#define RESET_WAIT 200
static int on26_test_port( PIA *pi) /* hard reset */
{ int i, m, d, x=0, y=0;
pi->saved_r0 = r0();
pi->saved_r2 = r2();
d = pi->delay;
m = pi->mode;
pi->delay = 5;
pi->mode = 0;
w2(0xc);
CCP(0x30); CCP(0);
w0(0xfe);w0(0xaa);w0(0x55);w0(0);w0(0xff);
i = ((r1() & 0xf0) << 4); w0(0x87);
i |= (r1() & 0xf0); w0(0x78);
w0(0x20);w2(4);w2(5);
i |= ((r1() & 0xf0) >> 4);
w2(4);w0(0xff);
if (i == 0xb5f) {
w0(2); P1; w0(0); P2;
w0(3); P1; w0(0); P2;
w0(2); P1; w0(8); P2; udelay(100);
w0(2); P1; w0(0xa); P2; udelay(100);
w0(2); P1; w0(8); P2; udelay(1000);
on26_write_regr(pi,0,6,0xa0);
for (i=0;i<RESET_WAIT;i++) {
on26_write_regr(pi,0,6,0xa0);
x = on26_read_regr(pi,0,7);
on26_write_regr(pi,0,6,0xb0);
y = on26_read_regr(pi,0,7);
if (!((x&0x80)||(y&0x80))) break;
mdelay(100);
}
if (i == RESET_WAIT)
printk("on26: Device reset failed (%x,%x)\n",x,y);
w0(4); P1; w0(4); P1;
}
CCP(0x30);
pi->delay = d;
pi->mode = m;
w0(pi->saved_r0);
w2(pi->saved_r2);
return 5;
}
static void on26_read_block( PIA *pi, char * buf, int count )
{ int k, a, b;
switch (pi->mode) {
case 0: w0(1); P1; w0(1); P2; w0(2); P1; w0(0x18); P2; w0(0); P1;
udelay(10);
for (k=0;k<count;k++) {
w2(6); a = r1();
w2(4); b = r1();
buf[k] = j44(a,b);
}
w0(2); P1; w0(8); P2;
break;
case 1: w0(1); P1; w0(1); P2; w0(2); P1; w0(0x19); P2; w0(0); P1;
udelay(10);
for (k=0;k<count/2;k++) {
w2(0x26); buf[2*k] = r0();
w2(0x24); buf[2*k+1] = r0();
}
w0(2); P1; w0(9); P2;
break;
case 2: w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0x24);
udelay(10);
for (k=0;k<count;k++) buf[k] = r4();
w2(4);
break;
case 3: w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0x24);
udelay(10);
for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w();
w2(4);
break;
case 4: w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0x24);
udelay(10);
for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l();
w2(4);
break;
}
}
static void on26_write_block( PIA *pi, char * buf, int count )
{ int k;
switch (pi->mode) {
case 0:
case 1: w0(1); P1; w0(1); P2;
w0(2); P1; w0(0x18+pi->mode); P2; w0(0); P1;
udelay(10);
for (k=0;k<count/2;k++) {
w2(5); w0(buf[2*k]);
w2(7); w0(buf[2*k+1]);
}
w2(5); w2(4);
w0(2); P1; w0(8+pi->mode); P2;
break;
case 2: w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0xc5);
udelay(10);
for (k=0;k<count;k++) w4(buf[k]);
w2(0xc4);
break;
case 3: w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0xc5);
udelay(10);
for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
w2(0xc4);
break;
case 4: w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0xc5);
udelay(10);
for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
w2(0xc4);
break;
}
}
static void on26_log_adapter( PIA *pi, char * scratch, int verbose )
{ char *mode_string[5] = {"4-bit","8-bit","EPP-8",
"EPP-16","EPP-32"};
printk("%s: on26 %s, OnSpec 90c26 at 0x%x, ",
pi->device,ON26_VERSION,pi->port);
printk("mode %d (%s), delay %d\n",pi->mode,
mode_string[pi->mode],pi->delay);
}
static void on26_init_proto( PIA *pi)
{ MOD_INC_USE_COUNT;
}
static void on26_release_proto( PIA *pi)
{ MOD_DEC_USE_COUNT;
}
struct pi_protocol on26 = {"on26",0,5,2,1,1,
on26_write_regr,
on26_read_regr,
on26_write_block,
on26_read_block,
on26_connect,
on26_disconnect,
on26_test_port,
0,
0,
on26_log_adapter,
on26_init_proto,
on26_release_proto
};
#ifdef MODULE
int init_module(void)
{ return pi_register( &on26 ) - 1;
}
void cleanup_module(void)
{ pi_unregister( &on26 );
}
#endif
/* end of on26.c */
MODULE_LICENSE("GPL");
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