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brintos / linux-shallow public Read only

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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * (c) 1997-1998  Grant R. Guenther <grant@torque.net>4 *5 * on26.c is a low-level protocol driver for the6 * OnSpec 90c26 parallel to IDE adapter chip.7 */8 9#include <linux/module.h>10#include <linux/init.h>11#include <linux/delay.h>12#include <linux/kernel.h>13#include <linux/types.h>14#include <linux/wait.h>15#include <asm/io.h>16#include "pata_parport.h"17 18/*19 * mode codes:  0  nybble reads, 8-bit writes20 *		1  8-bit reads and writes21 *		2  8-bit EPP mode22 *		3  EPP-1623 *		4  EPP-3224 */25 26#define j44(a, b)	(((a >> 4) & 0x0f) | (b & 0xf0))27 28#define P1						      \29	do {						      \30		w2(5); w2(0xd); w2(5); w2(0xd); w2(5); w2(4); \31	} while (0)32 33#define P2					\34	do {					\35		w2(5); w2(7); w2(5); w2(4);	\36	} while (0)37 38/*39 * cont = 0 - access the IDE register file40 * cont = 1 - access the IDE command set41 */42 43static int on26_read_regr(struct pi_adapter *pi, int cont, int regr)44{45	int a, b, r;46 47	r = (regr << 2) + 1 + cont;48 49	switch (pi->mode) {50	case 0:51		w0(1); P1; w0(r); P2; w0(0); P1;52		w2(6); a = r1(); w2(4);53		w2(6); b = r1(); w2(4);54		w2(6); w2(4); w2(6); w2(4);55		return j44(a, b);56	case 1:57		w0(1); P1; w0(r); P2; w0(0); P1;58		w2(0x26); a = r0(); w2(4); w2(0x26); w2(4);59		return a;60	case 2:61	case 3:62	case 4:63		w3(1); w3(1); w2(5); w4(r); w2(4);64		w3(0); w3(0); w2(0x24); a = r4(); w2(4);65		w2(0x24); (void)r4(); w2(4);66		return a;67	}68 69	return -1;70}71 72static void on26_write_regr(struct pi_adapter *pi, int cont, int regr, int val)73{74	int r = (regr << 2) + 1 + cont;75 76	switch (pi->mode) {77	case 0:78	case 1:79		w0(1); P1; w0(r); P2; w0(0); P1;80		w0(val); P2; w0(val); P2;81		break;82	case 2:83	case 3:84	case 4:85		w3(1); w3(1); w2(5); w4(r); w2(4);86		w3(0); w3(0);87		w2(5); w4(val); w2(4);88		w2(5); w4(val); w2(4);89		break;90	}91}92 93#define CCP(x)						\94	do {						\95		w0(0xfe); w0(0xaa); w0(0x55); w0(0);	\96		w0(0xff); w0(0x87); w0(0x78); w0(x);	\97		w2(4); w2(5); w2(4); w0(0xff);		\98	} while (0)99 100static void on26_connect(struct pi_adapter *pi)101{102	int x;103 104	pi->saved_r0 = r0();105	pi->saved_r2 = r2();106 107	CCP(0x20);108	if (pi->mode)109		x = 9;110	else111		x = 8;112 113	w0(2); P1; w0(8); P2;114	w0(2); P1; w0(x); P2;115}116 117static void on26_disconnect(struct pi_adapter *pi)118{119	if (pi->mode >= 2) {120		w3(4); w3(4); w3(4); w3(4);121	} else {122		w0(4); P1; w0(4); P1;123	}124	CCP(0x30);125	w0(pi->saved_r0);126	w2(pi->saved_r2);127}128 129#define	RESET_WAIT  200130 131/* hard reset */132static int on26_test_port(struct pi_adapter *pi)133{134	int i, m, d, x = 0, y = 0;135 136	pi->saved_r0 = r0();137	pi->saved_r2 = r2();138 139	d = pi->delay;140	m = pi->mode;141	pi->delay = 5;142	pi->mode = 0;143 144	w2(0xc);145 146	CCP(0x30); CCP(0);147 148	w0(0xfe); w0(0xaa); w0(0x55); w0(0); w0(0xff);149	i = ((r1() & 0xf0) << 4); w0(0x87);150	i |= (r1() & 0xf0); w0(0x78);151	w0(0x20); w2(4); w2(5);152	i |= ((r1() & 0xf0) >> 4);153	w2(4); w0(0xff);154 155	if (i == 0xb5f) {156		w0(2); P1; w0(0);   P2;157		w0(3); P1; w0(0);   P2;158		w0(2); P1; w0(8);   P2; udelay(100);159		w0(2); P1; w0(0xa); P2; udelay(100);160		w0(2); P1; w0(8);   P2; udelay(1000);161 162		on26_write_regr(pi, 0, 6, 0xa0);163 164		for (i = 0; i < RESET_WAIT; i++) {165			on26_write_regr(pi, 0, 6, 0xa0);166			x = on26_read_regr(pi, 0, 7);167			on26_write_regr(pi, 0, 6, 0xb0);168			y = on26_read_regr(pi, 0, 7);169			if (!((x & 0x80) || (y & 0x80)))170				break;171			mdelay(100);172		}173 174		if (i == RESET_WAIT)175			dev_err(&pi->dev,176				"on26: Device reset failed (%x,%x)\n", x, y);177 178		w0(4); P1; w0(4); P1;179	}180 181	CCP(0x30);182 183	pi->delay = d;184	pi->mode = m;185	w0(pi->saved_r0);186	w2(pi->saved_r2);187 188	return 5;189}190 191static void on26_read_block(struct pi_adapter *pi, char *buf, int count)192{193	int k, a, b;194 195	switch (pi->mode) {196	case 0:197		w0(1); P1; w0(1); P2; w0(2); P1; w0(0x18); P2; w0(0); P1;198		udelay(10);199		for (k = 0; k < count; k++) {200			w2(6); a = r1();201			w2(4); b = r1();202			buf[k] = j44(a, b);203		}204		w0(2); P1; w0(8); P2;205		break;206	case 1:207		w0(1); P1; w0(1); P2; w0(2); P1; w0(0x19); P2; w0(0); P1;208		udelay(10);209		for (k = 0; k < count / 2; k++) {210			w2(0x26); buf[2 * k] = r0();211			w2(0x24); buf[2 * k + 1] = r0();212		}213		w0(2); P1; w0(9); P2;214		break;215	case 2:216		w3(1); w3(1); w2(5); w4(1); w2(4);217		w3(0); w3(0); w2(0x24);218		udelay(10);219		for (k = 0; k < count; k++)220			buf[k] = r4();221		w2(4);222		break;223	case 3:224		w3(1); w3(1); w2(5); w4(1); w2(4);225		w3(0); w3(0); w2(0x24);226		udelay(10);227		for (k = 0; k < count / 2; k++)228			((u16 *)buf)[k] = r4w();229		w2(4);230		break;231	case 4:232		w3(1); w3(1); w2(5); w4(1); w2(4);233		w3(0); w3(0); w2(0x24);234		udelay(10);235		for (k = 0; k < count / 4; k++)236			((u32 *)buf)[k] = r4l();237		w2(4);238		break;239	}240}241 242static void on26_write_block(struct pi_adapter *pi, char *buf, int count)243{244	int k;245 246	switch (pi->mode) {247	case 0:248	case 1:249		w0(1); P1; w0(1); P2;250		w0(2); P1; w0(0x18 + pi->mode); P2; w0(0); P1;251		udelay(10);252		for (k = 0; k < count / 2; k++) {253			w2(5); w0(buf[2 * k]);254			w2(7); w0(buf[2 * k + 1]);255		}256		w2(5); w2(4);257		w0(2); P1; w0(8 + pi->mode); P2;258		break;259	case 2:260		w3(1); w3(1); w2(5); w4(1); w2(4);261		w3(0); w3(0); w2(0xc5);262		udelay(10);263		for (k = 0; k < count; k++)264			w4(buf[k]);265		w2(0xc4);266		break;267	case 3:268		w3(1); w3(1); w2(5); w4(1); w2(4);269		w3(0); w3(0); w2(0xc5);270		udelay(10);271		for (k = 0; k < count / 2; k++)272			w4w(((u16 *)buf)[k]);273		w2(0xc4);274		break;275	case 4:276		w3(1); w3(1); w2(5); w4(1); w2(4);277		w3(0); w3(0); w2(0xc5);278		udelay(10);279		for (k = 0; k < count / 4; k++)280			w4l(((u32 *)buf)[k]);281		w2(0xc4);282		break;283	}284}285 286static void on26_log_adapter(struct pi_adapter *pi)287{288	char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" };289 290	dev_info(&pi->dev,291		 "OnSpec 90c26 at 0x%x, mode %d (%s), delay %d\n",292		 pi->port, pi->mode, mode_string[pi->mode], pi->delay);293}294 295static struct pi_protocol on26 = {296	.owner		= THIS_MODULE,297	.name		= "on26",298	.max_mode	= 5,299	.epp_first	= 2,300	.default_delay	= 1,301	.max_units	= 1,302	.write_regr	= on26_write_regr,303	.read_regr	= on26_read_regr,304	.write_block	= on26_write_block,305	.read_block	= on26_read_block,306	.connect	= on26_connect,307	.disconnect	= on26_disconnect,308	.test_port	= on26_test_port,309	.log_adapter	= on26_log_adapter,310};311 312MODULE_LICENSE("GPL");313MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");314MODULE_DESCRIPTION("Onspec 90c26 parallel port IDE adapter protocol driver");315module_pata_parport_driver(on26);316