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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