/*
frpw.c (c) 1996-8 Grant R. Guenther <grant@torque.net>
Under the terms of the GNU General Public License
frpw.c is a low-level protocol driver for the Freecom "Power"
parallel port IDE adapter.
Some applications of this adapter may require a "printer" reset
prior to loading the driver. This can be done by loading and
unloading the "lp" driver, or it can be done by this driver
if you define FRPW_HARD_RESET. The latter is not recommended
as it may upset devices on other ports.
*/
/* Changes:
1.01 GRG 1998.05.06 init_proto, release_proto
fix chip detect
added EPP-16 and EPP-32
1.02 GRG 1998.09.23 added hard reset to initialisation process
1.03 GRG 1998.12.14 made hard reset conditional
*/
#define FRPW_VERSION "1.03"
#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 cec4 w2(0xc);w2(0xe);w2(0xe);w2(0xc);w2(4);w2(4);w2(4);
#define j44(l,h) (((l>>4)&0x0f)|(h&0xf0))
/* cont = 0 - access the IDE register file
cont = 1 - access the IDE command set
*/
static int cont_map[2] = { 0x08, 0x10 };
static int frpw_read_regr( PIA *pi, int cont, int regr )
{ int h,l,r;
r = regr + cont_map[cont];
w2(4);
w0(r); cec4;
w2(6); l = r1();
w2(4); h = r1();
w2(4);
return j44(l,h);
}
static void frpw_write_regr( PIA *pi, int cont, int regr, int val)
{ int r;
r = regr + cont_map[cont];
w2(4); w0(r); cec4;
w0(val);
w2(5);w2(7);w2(5);w2(4);
}
static void frpw_read_block_int( PIA *pi, char * buf, int count, int regr )
{ int h, l, k, ph;
switch(pi->mode) {
case 0: w2(4); w0(regr); cec4;
for (k=0;k<count;k++) {
w2(6); l = r1();
w2(4); h = r1();
buf[k] = j44(l,h);
}
w2(4);
break;
case 1: ph = 2;
w2(4); w0(regr + 0xc0); cec4;
w0(0xff);
for (k=0;k<count;k++) {
w2(0xa4 + ph);
buf[k] = r0();
ph = 2 - ph;
}
w2(0xac); w2(0xa4); w2(4);
break;
case 2: w2(4); w0(regr + 0x80); cec4;
for (k=0;k<count;k++) buf[k] = r4();
w2(0xac); w2(0xa4);
w2(4);
break;
case 3: w2(4); w0(regr + 0x80); cec4;
for (k=0;k<count-2;k++) buf[k] = r4();
w2(0xac); w2(0xa4);
buf[count-2] = r4();
buf[count-1] = r4();
w2(4);
break;
case 4: w2(4); w0(regr + 0x80); cec4;
for (k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w();
w2(0xac); w2(0xa4);
buf[count-2] = r4();
buf[count-1] = r4();
w2(4);
break;
case 5: w2(4); w0(regr + 0x80); cec4;
for (k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l();
buf[count-4] = r4();
buf[count-3] = r4();
w2(0xac); w2(0xa4);
buf[count-2] = r4();
buf[count-1] = r4();
w2(4);
break;
}
}
static void frpw_read_block( PIA *pi, char * buf, int count)
{ frpw_read_block_int(pi,buf,count,0x08);
}
static void frpw_write_block( PIA *pi, char * buf, int count )
{ int k;
switch(pi->mode) {
case 0:
case 1:
case 2: w2(4); w0(8); cec4; w2(5);
for (k=0;k<count;k++) {
w0(buf[k]);
w2(7);w2(5);
}
w2(4);
break;
case 3: w2(4); w0(0xc8); cec4; w2(5);
for (k=0;k<count;k++) w4(buf[k]);
w2(4);
break;
case 4: w2(4); w0(0xc8); cec4; w2(5);
for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
w2(4);
break;
case 5: w2(4); w0(0xc8); cec4; w2(5);
for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
w2(4);
break;
}
}
static void frpw_connect ( PIA *pi )
{ pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(4);
}
static void frpw_disconnect ( PIA *pi )
{ w2(4); w0(0x20); cec4;
w0(pi->saved_r0);
w2(pi->saved_r2);
}
/* Stub logic to see if PNP string is available - used to distinguish
between the Xilinx and ASIC implementations of the Freecom adapter.
*/
static int frpw_test_pnp ( PIA *pi )
/* returns chip_type: 0 = Xilinx, 1 = ASIC */
{ int olddelay, a, b;
#ifdef FRPW_HARD_RESET
w0(0); w2(8); udelay(50); w2(0xc); /* parallel bus reset */
mdelay(1500);
#endif
olddelay = pi->delay;
pi->delay = 10;
pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(4); w0(4); w2(6); w2(7);
a = r1() & 0xff; w2(4); b = r1() & 0xff;
w2(0xc); w2(0xe); w2(4);
pi->delay = olddelay;
w0(pi->saved_r0);
w2(pi->saved_r2);
return ((~a&0x40) && (b&0x40));
}
/* We use the pi->private to remember the result of the PNP test.
To make this work, private = port*2 + chip. Yes, I know it's
a hack :-(
*/
static int frpw_test_proto( PIA *pi, char * scratch, int verbose )
{ int j, k, r;
int e[2] = {0,0};
if ((pi->private>>1) != pi->port)
pi->private = frpw_test_pnp(pi) + 2*pi->port;
if (((pi->private%2) == 0) && (pi->mode > 2)) {
if (verbose)
printk("%s: frpw: Xilinx does not support mode %d\n",
pi->device, pi->mode);
return 1;
}
if (((pi->private%2) == 1) && (pi->mode == 2)) {
if (verbose)
printk("%s: frpw: ASIC does not support mode 2\n",
pi->device);
return 1;
}
frpw_connect(pi);
for (j=0;j<2;j++) {
frpw_write_regr(pi,0,6,0xa0+j*0x10);
for (k=0;k<256;k++) {
frpw_write_regr(pi,0,2,k^0xaa);
frpw_write_regr(pi,0,3,k^0x55);
if (frpw_read_regr(pi,0,2) != (k^0xaa)) e[j]++;
}
}
frpw_disconnect(pi);
frpw_connect(pi);
frpw_read_block_int(pi,scratch,512,0x10);
r = 0;
for (k=0;k<128;k++) if (scratch[k] != k) r++;
frpw_disconnect(pi);
if (verbose) {
printk("%s: frpw: port 0x%x, chip %ld, mode %d, test=(%d,%d,%d)\n",
pi->device,pi->port,(pi->private%2),pi->mode,e[0],e[1],r);
}
return (r || (e[0] && e[1]));
}
static void frpw_log_adapter( PIA *pi, char * scratch, int verbose )
{ char *mode_string[6] = {"4-bit","8-bit","EPP",
"EPP-8","EPP-16","EPP-32"};
printk("%s: frpw %s, Freecom (%s) adapter at 0x%x, ", pi->device,
FRPW_VERSION,((pi->private%2) == 0)?"Xilinx":"ASIC",pi->port);
printk("mode %d (%s), delay %d\n",pi->mode,
mode_string[pi->mode],pi->delay);
}
static struct pi_protocol frpw = {
.owner = THIS_MODULE,
.name = "frpw",
.max_mode = 6,
.epp_first = 2,
.default_delay = 2,
.max_units = 1,
.write_regr = frpw_write_regr,
.read_regr = frpw_read_regr,
.write_block = frpw_write_block,
.read_block = frpw_read_block,
.connect = frpw_connect,
.disconnect = frpw_disconnect,
.test_proto = frpw_test_proto,
.log_adapter = frpw_log_adapter,
};
static int __init frpw_init(void)
{
return pi_register(&frpw)-1;
}
static void __exit frpw_exit(void)
{
pi_unregister(&frpw);
}
MODULE_LICENSE("GPL");
module_init(frpw_init)
module_exit(frpw_exit)
