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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1998 Grant R. Guenther <grant@torque.net>
*
* friq.c is a low-level protocol driver for the Freecom "IQ"
* parallel port IDE adapter. Early versions of this adapter
* use the 'frpw' protocol.
*
* Freecom uses this adapter in a battery powered external
* CD-ROM drive. It is also used in LS-120 drives by
* Maxell and Panasonic, and other devices.
*
* The battery powered drive requires software support to
* control the power to the drive. This module enables the
* drive power when the high level driver (pcd) is loaded
* and disables it when the module is unloaded. Note, if
* the friq module is built in to the kernel, the power
* will never be switched off, so other means should be
* used to conserve battery power.
*/
#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 "pata_parport.h"
#define CMD(x) \
do { \
w2(4); w0(0xff); w0(0xff); w0(0x73); w0(0x73); \
w0(0xc9); w0(0xc9); w0(0x26); \
w0(0x26); w0(x); w0(x); \
} while (0)
#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 friq_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int h, l, r;
r = regr + cont_map[cont];
CMD(r);
w2(6); l = r1();
w2(4); h = r1();
w2(4);
return j44(l, h);
}
static void friq_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
int r = regr + cont_map[cont];
CMD(r);
w0(val);
w2(5); w2(7); w2(5); w2(4);
}
static void friq_read_block_int(struct pi_adapter *pi, char *buf, int count, int regr)
{
int h, l, k, ph;
switch (pi->mode) {
case 0:
CMD(regr);
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;
CMD(regr + 0xc0);
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:
CMD(regr + 0x80);
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 3:
CMD(regr + 0x80);
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 4:
CMD(regr + 0x80);
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 friq_read_block(struct pi_adapter *pi, char *buf, int count)
{
friq_read_block_int(pi, buf, count, 0x08);
}
static void friq_write_block(struct pi_adapter *pi, char *buf, int count)
{
int k;
switch (pi->mode) {
case 0:
case 1:
CMD(8); w2(5);
for (k = 0; k < count; k++) {
w0(buf[k]);
w2(7); w2(5);
}
w2(4);
break;
case 2:
CMD(0xc8); w2(5);
for (k = 0; k < count; k++)
w4(buf[k]);
w2(4);
break;
case 3:
CMD(0xc8); w2(5);
for (k = 0; k < count / 2; k++)
w4w(((u16 *)buf)[k]);
w2(4);
break;
case 4:
CMD(0xc8); w2(5);
for (k = 0; k < count / 4; k++)
w4l(((u32 *)buf)[k]);
w2(4);
break;
}
}
static void friq_connect(struct pi_adapter *pi)
{
pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(4);
}
static void friq_disconnect(struct pi_adapter *pi)
{
CMD(0x20);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static int friq_test_proto(struct pi_adapter *pi)
{
int j, k, r;
int e[2] = { 0, 0 };
char scratch[512];
pi->saved_r0 = r0();
w0(0xff); udelay(20); CMD(0x3d); /* turn the power on */
udelay(500);
w0(pi->saved_r0);
friq_connect(pi);
for (j = 0; j < 2; j++) {
friq_write_regr(pi, 0, 6, 0xa0 + j * 0x10);
for (k = 0; k < 256; k++) {
friq_write_regr(pi, 0, 2, k ^ 0xaa);
friq_write_regr(pi, 0, 3, k ^ 0x55);
if (friq_read_regr(pi, 0, 2) != (k ^ 0xaa))
e[j]++;
}
}
friq_disconnect(pi);
friq_connect(pi);
friq_read_block_int(pi, scratch, 512, 0x10);
r = 0;
for (k = 0; k < 128; k++) {
if (scratch[k] != k)
r++;
}
friq_disconnect(pi);
dev_dbg(&pi->dev,
"friq: port 0x%x, mode %d, test=(%d,%d,%d)\n",
pi->port, pi->mode, e[0], e[1], r);
return r || (e[0] && e[1]);
}
static void friq_log_adapter(struct pi_adapter *pi)
{
char *mode_string[6] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32"};
dev_info(&pi->dev,
"Freecom IQ ASIC-2 adapter at 0x%x, mode %d (%s), delay %d\n",
pi->port, pi->mode, mode_string[pi->mode], pi->delay);
pi->private = 1;
friq_connect(pi);
CMD(0x9e); /* disable sleep timer */
friq_disconnect(pi);
}
static void friq_release_proto(struct pi_adapter *pi)
{
if (pi->private) { /* turn off the power */
friq_connect(pi);
CMD(0x1d); CMD(0x1e);
friq_disconnect(pi);
pi->private = 0;
}
}
static struct pi_protocol friq = {
.owner = THIS_MODULE,
.name = "friq",
.max_mode = 5,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = friq_write_regr,
.read_regr = friq_read_regr,
.write_block = friq_write_block,
.read_block = friq_read_block,
.connect = friq_connect,
.disconnect = friq_disconnect,
.test_proto = friq_test_proto,
.log_adapter = friq_log_adapter,
.release_proto = friq_release_proto,
};
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
MODULE_DESCRIPTION("Freecom IQ parallel port IDE adapter protocol driver");
module_pata_parport_driver(friq);
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