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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 * dstr.c is a low-level protocol driver for the DataStor EP2000 parallel6 * 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 >> 3) & 0x07) | ((~a >> 4) & 0x08) | \27 ((b << 1) & 0x70) | ((~b) & 0x80))28 29#define P1 w2(5);w2(0xd);w2(5);w2(4);30#define P2 w2(5);w2(7);w2(5);w2(4);31#define P3 w2(6);w2(4);w2(6);w2(4);32 33/*34 * cont = 0 - access the IDE register file35 * cont = 1 - access the IDE command set36 */37static int cont_map[2] = { 0x20, 0x40 };38 39static int dstr_read_regr(struct pi_adapter *pi, int cont, int regr)40{41 int a, b, r;42 43 r = regr + cont_map[cont];44 45 w0(0x81); P1;46 if (pi->mode)47 w0(0x11);48 else49 w0(1);50 P2; w0(r); P1;51 52 switch (pi->mode) {53 case 0:54 w2(6); a = r1(); w2(4); w2(6); b = r1(); w2(4);55 return j44(a, b);56 case 1:57 w0(0); w2(0x26); a = r0(); w2(4);58 return a;59 case 2:60 case 3:61 case 4:62 w2(0x24); a = r4(); w2(4);63 return a;64 }65 66 return -1;67}68 69static void dstr_write_regr(struct pi_adapter *pi, int cont, int regr, int val)70{71 int r = regr + cont_map[cont];72 73 w0(0x81); P1;74 if (pi->mode >= 2)75 w0(0x11);76 else77 w0(1);78 P2; w0(r); P1;79 80 switch (pi->mode) {81 case 0:82 case 1:83 w0(val); w2(5); w2(7); w2(5); w2(4);84 break;85 case 2:86 case 3:87 case 4:88 w4(val);89 break;90 }91}92 93#define CCP(x) \94 do { \95 w0(0xff); w2(0xc); w2(4); \96 w0(0xaa); w0(0x55); w0(0); w0(0xff); \97 w0(0x87); w0(0x78); \98 w0(x); w2(5); w2(4); \99 } while (0)100 101static void dstr_connect(struct pi_adapter *pi)102{103 pi->saved_r0 = r0();104 pi->saved_r2 = r2();105 w2(4); CCP(0xe0); w0(0xff);106}107 108static void dstr_disconnect(struct pi_adapter *pi)109{110 CCP(0x30);111 w0(pi->saved_r0);112 w2(pi->saved_r2);113}114 115static void dstr_read_block(struct pi_adapter *pi, char *buf, int count)116{117 int k, a, b;118 119 w0(0x81); P1;120 if (pi->mode)121 w0(0x19);122 else123 w0(9);124 P2; w0(0x82); P1; P3; w0(0x20); P1;125 126 switch (pi->mode) {127 case 0:128 for (k = 0; k < count; k++) {129 w2(6); a = r1(); w2(4);130 w2(6); b = r1(); w2(4);131 buf[k] = j44(a, b);132 }133 break;134 case 1:135 w0(0);136 for (k = 0; k < count; k++) {137 w2(0x26);138 buf[k] = r0();139 w2(0x24);140 }141 w2(4);142 break;143 case 2:144 w2(0x24);145 for (k = 0; k < count; k++)146 buf[k] = r4();147 w2(4);148 break;149 case 3:150 w2(0x24);151 for (k = 0; k < count / 2; k++)152 ((u16 *)buf)[k] = r4w();153 w2(4);154 break;155 case 4:156 w2(0x24);157 for (k = 0; k < count / 4; k++)158 ((u32 *)buf)[k] = r4l();159 w2(4);160 break;161 }162}163 164static void dstr_write_block(struct pi_adapter *pi, char *buf, int count)165{166 int k;167 168 w0(0x81); P1;169 if (pi->mode)170 w0(0x19);171 else172 w0(9);173 P2; w0(0x82); P1; P3; w0(0x20); P1;174 175 switch (pi->mode) {176 case 0:177 case 1:178 for (k = 0; k < count; k++) {179 w2(5);180 w0(buf[k]);181 w2(7);182 }183 w2(5); w2(4);184 break;185 case 2:186 w2(0xc5);187 for (k = 0; k < count; k++)188 w4(buf[k]);189 w2(0xc4);190 break;191 case 3:192 w2(0xc5);193 for (k = 0; k < count / 2; k++)194 w4w(((u16 *)buf)[k]);195 w2(0xc4);196 break;197 case 4:198 w2(0xc5);199 for (k = 0; k < count / 4; k++)200 w4l(((u32 *)buf)[k]);201 w2(0xc4);202 break;203 }204}205 206static void dstr_log_adapter(struct pi_adapter *pi)207 208{209 char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" };210 211 dev_info(&pi->dev,212 "DataStor EP2000 at 0x%x, mode %d (%s), delay %d\n",213 pi->port, pi->mode, mode_string[pi->mode], pi->delay);214}215 216static struct pi_protocol dstr = {217 .owner = THIS_MODULE,218 .name = "dstr",219 .max_mode = 5,220 .epp_first = 2,221 .default_delay = 1,222 .max_units = 1,223 .write_regr = dstr_write_regr,224 .read_regr = dstr_read_regr,225 .write_block = dstr_write_block,226 .read_block = dstr_read_block,227 .connect = dstr_connect,228 .disconnect = dstr_disconnect,229 .log_adapter = dstr_log_adapter,230};231 232MODULE_LICENSE("GPL");233MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");234MODULE_DESCRIPTION("DataStor EP2000 parallel port IDE adapter protocol driver");235module_pata_parport_driver(dstr);236