drivers/ata/pata_parport/kbic.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * (c) 1997-1998  Grant R. Guenther <grant@torque.net>
  *
  * This is a low-level driver for the KBIC-951A and KBIC-971A
  * parallel to IDE adapter chips from KingByte Information Systems.
  *
  * The chips are almost identical, however, the wakeup code
  * required for the 971A interferes with the correct operation of
  * the 951A, so this driver registers itself twice, once for
  * each chip.
  */

 #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 r12w()		(delay_p, inw(pi->port + 1) & 0xffff)

 #define j44(a, b)	((((a >> 4) & 0x0f) | (b & 0xf0)) ^ 0x88)
 #define j53(w)		(((w >> 3) & 0x1f) | ((w >> 4) & 0xe0))


 /*
  * cont = 0 - access the IDE register file
  * cont = 1 - access the IDE command set
  */
 static int cont_map[2] = { 0x80, 0x40 };

 static int kbic_read_regr(struct pi_adapter *pi, int cont, int regr)
 {
 	int a, b, s;

 	s = cont_map[cont];

 	switch (pi->mode) {
 	case 0:
 		w0(regr | 0x18 | s); w2(4); w2(6); w2(4); w2(1); w0(8);
 		a = r1(); w0(0x28); b = r1(); w2(4);
 		return j44(a, b);
 	case 1:
 		w0(regr|0x38 | s); w2(4); w2(6); w2(4); w2(5); w0(8);
 		a = r12w(); w2(4);
 		return j53(a);
 	case 2:
 		w0(regr | 0x08 | s); w2(4); w2(6); w2(4); w2(0xa5); w2(0xa1);
 		a = r0(); w2(4);
 		return a;
 	case 3:
 	case 4:
 	case 5:
 		w0(0x20 | s); w2(4); w2(6); w2(4); w3(regr);
 		a = r4(); b = r4(); w2(4); w2(0); w2(4);
 		return a;
 	}

 	return -1;
 }

 static void kbic_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
 {
 	int s = cont_map[cont];

 	switch (pi->mode) {
 	case 0:
 	case 1:
 	case 2:
 		w0(regr | 0x10 | s); w2(4); w2(6); w2(4);
 		w0(val); w2(5); w2(4);
 		break;
 	case 3:
 	case 4:
 	case 5:
 		w0(0x20 | s); w2(4); w2(6); w2(4); w3(regr);
 		w4(val); w4(val);
 		w2(4); w2(0); w2(4);
 		break;
 	}
 }

 static void k951_connect(struct pi_adapter *pi)
 {
 	pi->saved_r0 = r0();
 	pi->saved_r2 = r2();
 	w2(4);
 }

 static void k951_disconnect(struct pi_adapter *pi)
 {
 	w0(pi->saved_r0);
 	w2(pi->saved_r2);
 }

 #define	CCP(x)						\
 	do {						\
 		w2(0xc4); w0(0xaa); w0(0x55);		\
 		w0(0); w0(0xff); w0(0x87);		\
 		w0(0x78); w0(x); w2(0xc5);		\
 		w2(0xc4); w0(0xff);			\
 	} while (0)

 static void k971_connect(struct pi_adapter *pi)
 {
 	pi->saved_r0 = r0();
 	pi->saved_r2 = r2();
 	CCP(0x20);
 	w2(4);
 }

 static void k971_disconnect(struct pi_adapter *pi)
 {
 	CCP(0x30);
 	w0(pi->saved_r0);
 	w2(pi->saved_r2);
 }

 /*
  * count must be congruent to 0 MOD 4, but all known applications
  *have this property.
  */
 static void kbic_read_block(struct pi_adapter *pi, char *buf, int count)
 {
 	int k, a, b;

 	switch (pi->mode) {
 	case 0:
 		w0(0x98); w2(4); w2(6); w2(4);
 		for (k = 0; k < count / 2; k++) {
 			w2(1); w0(8);
 			a = r1();
 			w0(0x28);
 			b = r1();
 			buf[2 * k] = j44(a, b);
 			w2(5);
 			b = r1();
 			w0(8);
 			a = r1();
 			buf[2 * k + 1] = j44(a, b);
 			w2(4);
 		}
 		break;
 	case 1:
 		w0(0xb8); w2(4); w2(6); w2(4);
 		for (k = 0; k < count / 4; k++) {
 			w0(0xb8);
 			w2(4); w2(5);
 			w0(8);
 			buf[4 * k] = j53(r12w());
 			w0(0xb8);
 			buf[4 * k + 1] = j53(r12w());
 			w2(4); w2(5);
 			buf[4 * k + 3] = j53(r12w());
 			w0(8);
 			buf[4 * k + 2] = j53(r12w());
 		}
 		w2(4);
 		break;
 	case 2:
 		w0(0x88); w2(4); w2(6); w2(4);
 		for (k = 0; k < count / 2; k++) {
 			w2(0xa0); w2(0xa1);
 			buf[2 * k] = r0();
 			w2(0xa5);
 			buf[2 * k + 1] = r0();
 		}
 		w2(4);
 		break;
 	case 3:
 		w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 		for (k = 0; k < count; k++)
 			buf[k] = r4();
 		w2(4); w2(0); w2(4);
 		break;
 	case 4:
 		w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 		for (k = 0; k < count / 2; k++)
 			((u16 *)buf)[k] = r4w();
 		w2(4); w2(0); w2(4);
 		break;
 	case 5:
 		w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 		for (k = 0; k < count / 4; k++)
 			((u32 *)buf)[k] = r4l();
 		w2(4); w2(0); w2(4);
 		break;
 	}
 }

 static void kbic_write_block(struct pi_adapter *pi, char *buf, int count)
 {
 	int k;

 	switch (pi->mode) {
 	case 0:
 	case 1:
 	case 2:
 		w0(0x90); w2(4); w2(6); w2(4);
 		for (k = 0; k < count / 2; k++) {
 			w0(buf[2 * k + 1]);
 			w2(0); w2(4);
 			w0(buf[2 * k]);
 			w2(5); w2(4);
 		}
 		break;
 	case 3:
 		w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 		for (k = 0; k < count / 2; k++) {
 			w4(buf[2 * k + 1]);
 			w4(buf[2 * k]);
 		}
 		w2(4); w2(0); w2(4);
 		break;
 	case 4:
 		w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 		for (k = 0; k < count / 2; k++)
 			w4w(swab16(((u16 *)buf)[k]));
 		w2(4); w2(0); w2(4);
 		break;
 	case 5:
 		w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 		for (k = 0; k < count / 4; k++)
 			w4l(swab16(((u16 *)buf)[2 * k]) |
 			    swab16(((u16 *)buf)[2 * k + 1]) << 16);
 		w2(4); w2(0); w2(4);
 		break;
 	}
 }

 static void kbic_log_adapter(struct pi_adapter *pi, char *chip)
 {
 	char *mode[6] = { "4-bit", "5/3", "8-bit", "EPP-8", "EPP_16", "EPP-32"};

 	dev_info(&pi->dev, "KingByte %s at 0x%x, mode %d (%s), delay %d\n",
 		 chip, pi->port, pi->mode, mode[pi->mode], pi->delay);
 }

 static void k951_log_adapter(struct pi_adapter *pi)
 {
 	kbic_log_adapter(pi, "KBIC-951A");
 }

 static void k971_log_adapter(struct pi_adapter *pi)
 {
 	kbic_log_adapter(pi, "KBIC-971A");
 }

 static struct pi_protocol k951 = {
 	.owner		= THIS_MODULE,
 	.name		= "k951",
 	.max_mode	= 6,
 	.epp_first	= 3,
 	.default_delay	= 1,
 	.max_units	= 1,
 	.write_regr	= kbic_write_regr,
 	.read_regr	= kbic_read_regr,
 	.write_block	= kbic_write_block,
 	.read_block	= kbic_read_block,
 	.connect	= k951_connect,
 	.disconnect	= k951_disconnect,
 	.log_adapter	= k951_log_adapter,
 };

 static struct pi_protocol k971 = {
 	.owner		= THIS_MODULE,
 	.name		= "k971",
 	.max_mode	= 6,
 	.epp_first	= 3,
 	.default_delay	= 1,
 	.max_units	= 1,
 	.write_regr	= kbic_write_regr,
 	.read_regr	= kbic_read_regr,
 	.write_block	= kbic_write_block,
 	.read_block	= kbic_read_block,
 	.connect	= k971_connect,
 	.disconnect	= k971_disconnect,
 	.log_adapter	= k971_log_adapter,
 };

 static int __init kbic_init(void)
 {
 	int rv;

 	rv = pata_parport_register_driver(&k951);
 	if (rv < 0)
 		return rv;
 	rv = pata_parport_register_driver(&k971);
 	if (rv < 0)
 		pata_parport_unregister_driver(&k951);
 	return rv;
 }

 static void __exit kbic_exit(void)
 {
 	pata_parport_unregister_driver(&k951);
 	pata_parport_unregister_driver(&k971);
 }

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
 MODULE_DESCRIPTION("KingByte Information Systems KBIC-951A and KBIC-971A "
 		   "parallel port IDE adapter protocol driver");
 module_init(kbic_init)
 module_exit(kbic_exit)
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* (c) 1997-1998 Grant R. Guenther <grant@torque.net>
	*
	* This is a low-level driver for the KBIC-951A and KBIC-971A
	* parallel to IDE adapter chips from KingByte Information Systems.
	*
	* The chips are almost identical, however, the wakeup code
	* required for the 971A interferes with the correct operation of
	* the 951A, so this driver registers itself twice, once for
	* each chip.
	*/

	#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 r12w() (delay_p, inw(pi->port + 1) & 0xffff)

	#define j44(a, b) ((((a >> 4) & 0x0f) \| (b & 0xf0)) ^ 0x88)
	#define j53(w) (((w >> 3) & 0x1f) \| ((w >> 4) & 0xe0))


	/*
	* cont = 0 - access the IDE register file
	* cont = 1 - access the IDE command set
	*/
	static int cont_map[2] = { 0x80, 0x40 };

	static int kbic_read_regr(struct pi_adapter *pi, int cont, int regr)
	{
	int a, b, s;

	s = cont_map[cont];

	switch (pi->mode) {
	case 0:
	w0(regr \| 0x18 \| s); w2(4); w2(6); w2(4); w2(1); w0(8);
	a = r1(); w0(0x28); b = r1(); w2(4);
	return j44(a, b);
	case 1:
	w0(regr\|0x38 \| s); w2(4); w2(6); w2(4); w2(5); w0(8);
	a = r12w(); w2(4);
	return j53(a);
	case 2:
	w0(regr \| 0x08 \| s); w2(4); w2(6); w2(4); w2(0xa5); w2(0xa1);
	a = r0(); w2(4);
	return a;
	case 3:
	case 4:
	case 5:
	w0(0x20 \| s); w2(4); w2(6); w2(4); w3(regr);
	a = r4(); b = r4(); w2(4); w2(0); w2(4);
	return a;
	}

	return -1;
	}

	static void kbic_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
	{
	int s = cont_map[cont];

	switch (pi->mode) {
	case 0:
	case 1:
	case 2:
	w0(regr \| 0x10 \| s); w2(4); w2(6); w2(4);
	w0(val); w2(5); w2(4);
	break;
	case 3:
	case 4:
	case 5:
	w0(0x20 \| s); w2(4); w2(6); w2(4); w3(regr);
	w4(val); w4(val);
	w2(4); w2(0); w2(4);
	break;
	}
	}

	static void k951_connect(struct pi_adapter *pi)
	{
	pi->saved_r0 = r0();
	pi->saved_r2 = r2();
	w2(4);
	}

	static void k951_disconnect(struct pi_adapter *pi)
	{
	w0(pi->saved_r0);
	w2(pi->saved_r2);
	}

	#define CCP(x) \
	do { \
	w2(0xc4); w0(0xaa); w0(0x55); \
	w0(0); w0(0xff); w0(0x87); \
	w0(0x78); w0(x); w2(0xc5); \
	w2(0xc4); w0(0xff); \
	} while (0)

	static void k971_connect(struct pi_adapter *pi)
	{
	pi->saved_r0 = r0();
	pi->saved_r2 = r2();
	CCP(0x20);
	w2(4);
	}

	static void k971_disconnect(struct pi_adapter *pi)
	{
	CCP(0x30);
	w0(pi->saved_r0);
	w2(pi->saved_r2);
	}

	/*
	* count must be congruent to 0 MOD 4, but all known applications
	*have this property.
	*/
	static void kbic_read_block(struct pi_adapter pi, char buf, int count)
	{
	int k, a, b;

	switch (pi->mode) {
	case 0:
	w0(0x98); w2(4); w2(6); w2(4);
	for (k = 0; k < count / 2; k++) {
	w2(1); w0(8);
	a = r1();
	w0(0x28);
	b = r1();
	buf[2 * k] = j44(a, b);
	w2(5);
	b = r1();
	w0(8);
	a = r1();
	buf[2 * k + 1] = j44(a, b);
	w2(4);
	}
	break;
	case 1:
	w0(0xb8); w2(4); w2(6); w2(4);
	for (k = 0; k < count / 4; k++) {
	w0(0xb8);
	w2(4); w2(5);
	w0(8);
	buf[4 * k] = j53(r12w());
	w0(0xb8);
	buf[4 * k + 1] = j53(r12w());
	w2(4); w2(5);
	buf[4 * k + 3] = j53(r12w());
	w0(8);
	buf[4 * k + 2] = j53(r12w());
	}
	w2(4);
	break;
	case 2:
	w0(0x88); w2(4); w2(6); w2(4);
	for (k = 0; k < count / 2; k++) {
	w2(0xa0); w2(0xa1);
	buf[2 * k] = r0();
	w2(0xa5);
	buf[2 * k + 1] = r0();
	}
	w2(4);
	break;
	case 3:
	w0(0xa0); w2(4); w2(6); w2(4); w3(0);
	for (k = 0; k < count; k++)
	buf[k] = r4();
	w2(4); w2(0); w2(4);
	break;
	case 4:
	w0(0xa0); w2(4); w2(6); w2(4); w3(0);
	for (k = 0; k < count / 2; k++)
	((u16 *)buf)[k] = r4w();
	w2(4); w2(0); w2(4);
	break;
	case 5:
	w0(0xa0); w2(4); w2(6); w2(4); w3(0);
	for (k = 0; k < count / 4; k++)
	((u32 *)buf)[k] = r4l();
	w2(4); w2(0); w2(4);
	break;
	}
	}

	static void kbic_write_block(struct pi_adapter pi, char buf, int count)
	{
	int k;

	switch (pi->mode) {
	case 0:
	case 1:
	case 2:
	w0(0x90); w2(4); w2(6); w2(4);
	for (k = 0; k < count / 2; k++) {
	w0(buf[2 * k + 1]);
	w2(0); w2(4);
	w0(buf[2 * k]);
	w2(5); w2(4);
	}
	break;
	case 3:
	w0(0xa0); w2(4); w2(6); w2(4); w3(0);
	for (k = 0; k < count / 2; k++) {
	w4(buf[2 * k + 1]);
	w4(buf[2 * k]);
	}
	w2(4); w2(0); w2(4);
	break;
	case 4:
	w0(0xa0); w2(4); w2(6); w2(4); w3(0);
	for (k = 0; k < count / 2; k++)
	w4w(swab16(((u16 *)buf)[k]));
	w2(4); w2(0); w2(4);
	break;
	case 5:
	w0(0xa0); w2(4); w2(6); w2(4); w3(0);
	for (k = 0; k < count / 4; k++)
	w4l(swab16(((u16 )buf)[2 k]) \|
	swab16(((u16 )buf)[2 k + 1]) << 16);
	w2(4); w2(0); w2(4);
	break;
	}
	}

	static void kbic_log_adapter(struct pi_adapter pi, char chip)
	{
	char *mode[6] = { "4-bit", "5/3", "8-bit", "EPP-8", "EPP_16", "EPP-32"};

	dev_info(&pi->dev, "KingByte %s at 0x%x, mode %d (%s), delay %d\n",
	chip, pi->port, pi->mode, mode[pi->mode], pi->delay);
	}

	static void k951_log_adapter(struct pi_adapter *pi)
	{
	kbic_log_adapter(pi, "KBIC-951A");
	}

	static void k971_log_adapter(struct pi_adapter *pi)
	{
	kbic_log_adapter(pi, "KBIC-971A");
	}

	static struct pi_protocol k951 = {
	.owner = THIS_MODULE,
	.name = "k951",
	.max_mode = 6,
	.epp_first = 3,
	.default_delay = 1,
	.max_units = 1,
	.write_regr = kbic_write_regr,
	.read_regr = kbic_read_regr,
	.write_block = kbic_write_block,
	.read_block = kbic_read_block,
	.connect = k951_connect,
	.disconnect = k951_disconnect,
	.log_adapter = k951_log_adapter,
	};

	static struct pi_protocol k971 = {
	.owner = THIS_MODULE,
	.name = "k971",
	.max_mode = 6,
	.epp_first = 3,
	.default_delay = 1,
	.max_units = 1,
	.write_regr = kbic_write_regr,
	.read_regr = kbic_read_regr,
	.write_block = kbic_write_block,
	.read_block = kbic_read_block,
	.connect = k971_connect,
	.disconnect = k971_disconnect,
	.log_adapter = k971_log_adapter,
	};

	static int __init kbic_init(void)
	{
	int rv;

	rv = pata_parport_register_driver(&k951);
	if (rv < 0)
	return rv;
	rv = pata_parport_register_driver(&k971);
	if (rv < 0)
	pata_parport_unregister_driver(&k951);
	return rv;
	}

	static void __exit kbic_exit(void)
	{
	pata_parport_unregister_driver(&k951);
	pata_parport_unregister_driver(&k971);
	}

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
	MODULE_DESCRIPTION("KingByte Information Systems KBIC-951A and KBIC-971A "
	"parallel port IDE adapter protocol driver");
	module_init(kbic_init)
	module_exit(kbic_exit)