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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 * This is the low level protocol driver for the EPAT parallel6 * to IDE adapter from Shuttle Technologies. This adapter is7 * used in many popular parallel port disk products such as the8 * SyQuest EZ drives, the Avatar Shark and the Imation SuperDisk.9 */10 11#include <linux/module.h>12#include <linux/init.h>13#include <linux/delay.h>14#include <linux/kernel.h>15#include <linux/types.h>16#include <linux/wait.h>17#include <asm/io.h>18#include "pata_parport.h"19 20#define j44(a, b) (((a >> 4) & 0x0f) + (b & 0xf0))21#define j53(a, b) (((a >> 3) & 0x1f) + ((b << 4) & 0xe0))22 23static int epatc8;24 25module_param(epatc8, int, 0);26MODULE_PARM_DESC(epatc8,27 "support for the Shuttle EP1284 chip, "28 "used in any recent Imation SuperDisk (LS-120) drive.");29 30/*31 * cont = 0 IDE register file32 * cont = 1 IDE control registers33 * cont = 2 internal EPAT registers34 */35static int cont_map[3] = { 0x18, 0x10, 0 };36 37static void epat_write_regr(struct pi_adapter *pi, int cont, int regr, int val)38{39 int r = regr + cont_map[cont];40 41 switch (pi->mode) {42 case 0:43 case 1:44 case 2:45 w0(0x60+r); w2(1); w0(val); w2(4);46 break;47 case 3:48 case 4:49 case 5:50 w3(0x40+r); w4(val);51 break;52 }53}54 55static int epat_read_regr(struct pi_adapter *pi, int cont, int regr)56{57 int a, b, r;58 59 r = regr + cont_map[cont];60 61 switch (pi->mode) {62 63 case 0:64 w0(r); w2(1); w2(3);65 a = r1(); w2(4); b = r1();66 return j44(a, b);67 case 1:68 w0(0x40+r); w2(1); w2(4);69 a = r1(); b = r2(); w0(0xff);70 return j53(a, b);71 case 2:72 w0(0x20+r); w2(1); w2(0x25);73 a = r0(); w2(4);74 return a;75 case 3:76 case 4:77 case 5:78 w3(r); w2(0x24); a = r4(); w2(4);79 return a;80 }81 82 return -1; /* never gets here */83}84 85static void epat_read_block(struct pi_adapter *pi, char *buf, int count)86{87 int k, ph, a, b;88 89 switch (pi->mode) {90 91 case 0:92 w0(7); w2(1); w2(3); w0(0xff);93 ph = 0;94 for (k = 0; k < count; k++) {95 if (k == count-1)96 w0(0xfd);97 w2(6 + ph); a = r1();98 if (a & 8) {99 b = a;100 } else {101 w2(4+ph); b = r1();102 }103 buf[k] = j44(a, b);104 ph = 1 - ph;105 }106 w0(0); w2(4);107 break;108 109 case 1:110 w0(0x47); w2(1); w2(5); w0(0xff);111 ph = 0;112 for (k = 0; k < count; k++) {113 if (k == count - 1)114 w0(0xfd);115 w2(4 + ph);116 a = r1(); b = r2();117 buf[k] = j53(a, b);118 ph = 1 - ph;119 }120 w0(0); w2(4);121 break;122 123 case 2:124 w0(0x27); w2(1); w2(0x25); w0(0);125 ph = 0;126 for (k = 0; k < count - 1; k++) {127 w2(0x24 + ph);128 buf[k] = r0();129 ph = 1 - ph;130 }131 w2(0x26); w2(0x27);132 buf[count - 1] = r0();133 w2(0x25); w2(4);134 break;135 136 case 3:137 w3(0x80); w2(0x24);138 for (k = 0; k < count - 1; k++)139 buf[k] = r4();140 w2(4); w3(0xa0); w2(0x24);141 buf[count - 1] = r4();142 w2(4);143 break;144 145 case 4:146 w3(0x80); w2(0x24);147 for (k = 0; k < count / 2 - 1; k++)148 ((u16 *)buf)[k] = r4w();149 buf[count - 2] = r4();150 w2(4); w3(0xa0); w2(0x24);151 buf[count - 1] = r4();152 w2(4);153 break;154 155 case 5:156 w3(0x80); w2(0x24);157 for (k = 0; k < count / 4 - 1; k++)158 ((u32 *)buf)[k] = r4l();159 for (k = count - 4; k < count - 1; k++)160 buf[k] = r4();161 w2(4); w3(0xa0); w2(0x24);162 buf[count - 1] = r4();163 w2(4);164 break;165 }166}167 168static void epat_write_block(struct pi_adapter *pi, char *buf, int count)169{170 int ph, k;171 172 switch (pi->mode) {173 case 0:174 case 1:175 case 2:176 w0(0x67); w2(1); w2(5);177 ph = 0;178 for (k = 0; k < count; k++) {179 w0(buf[k]);180 w2(4 + ph);181 ph = 1 - ph;182 }183 w2(7); w2(4);184 break;185 case 3:186 w3(0xc0);187 for (k = 0; k < count; k++)188 w4(buf[k]);189 w2(4);190 break;191 case 4:192 w3(0xc0);193 for (k = 0; k < count / 2; k++)194 w4w(((u16 *)buf)[k]);195 w2(4);196 break;197 case 5:198 w3(0xc0);199 for (k = 0; k < count / 4; k++)200 w4l(((u32 *)buf)[k]);201 w2(4);202 break;203 }204}205 206/* these macros access the EPAT registers in native addressing */207 208#define WR(r, v) epat_write_regr(pi, 2, r, v)209#define RR(r) epat_read_regr(pi, 2, r)210 211/* and these access the IDE task file */212 213#define WRi(r, v) epat_write_regr(pi, 0, r, v)214#define RRi(r) epat_read_regr(pi, 0, r)215 216/* FIXME: the CPP stuff should be fixed to handle multiple EPATs on a chain */217 218#define CPP(x) \219 do { \220 w2(4); w0(0x22); w0(0xaa); \221 w0(0x55); w0(0); w0(0xff); \222 w0(0x87); w0(0x78); w0(x); \223 w2(4); w2(5); w2(4); w0(0xff); \224 } while (0)225 226static void epat_connect(struct pi_adapter *pi)227{228 pi->saved_r0 = r0();229 pi->saved_r2 = r2();230 231 /* Initialize the chip */232 CPP(0);233 234 if (epatc8) {235 CPP(0x40); CPP(0xe0);236 w0(0); w2(1); w2(4);237 WR(0x8, 0x12);238 WR(0xc, 0x14);239 WR(0x12, 0x10);240 WR(0xe, 0xf);241 WR(0xf, 4);242 /* WR(0xe,0xa);WR(0xf,4); */243 WR(0xe, 0xd);244 WR(0xf, 0);245 /* CPP(0x30); */246 }247 248 /* Connect to the chip */249 CPP(0xe0);250 w0(0); w2(1); w2(4); /* Idle into SPP */251 if (pi->mode >= 3) {252 w0(0); w2(1); w2(4); w2(0xc);253 /* Request EPP */254 w0(0x40); w2(6); w2(7); w2(4); w2(0xc); w2(4);255 }256 257 if (!epatc8) {258 WR(8, 0x10);259 WR(0xc, 0x14);260 WR(0xa, 0x38);261 WR(0x12, 0x10);262 }263}264 265static void epat_disconnect(struct pi_adapter *pi)266{267 CPP(0x30);268 w0(pi->saved_r0);269 w2(pi->saved_r2);270}271 272static int epat_test_proto(struct pi_adapter *pi)273{274 int k, j, f, cc;275 int e[2] = { 0, 0 };276 char scratch[512];277 278 epat_connect(pi);279 cc = RR(0xd);280 epat_disconnect(pi);281 282 epat_connect(pi);283 for (j=0;j<2;j++) {284 WRi(6, 0xa0 + j * 0x10);285 for (k = 0; k < 256; k++) {286 WRi(2, k ^ 0xaa);287 WRi(3, k ^ 0x55);288 if (RRi(2) != (k ^ 0xaa))289 e[j]++;290 }291 }292 epat_disconnect(pi);293 294 f = 0;295 epat_connect(pi);296 WR(0x13, 1); WR(0x13, 0); WR(0xa, 0x11);297 epat_read_block(pi, scratch, 512);298 299 for (k = 0; k < 256; k++) {300 if ((scratch[2 * k] & 0xff) != k)301 f++;302 if ((scratch[2 * k + 1] & 0xff) != 0xff - k)303 f++;304 }305 epat_disconnect(pi);306 307 dev_dbg(&pi->dev,308 "epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n",309 pi->port, pi->mode, cc, e[0], e[1], f);310 311 return (e[0] && e[1]) || f;312}313 314static void epat_log_adapter(struct pi_adapter *pi)315{316 int ver;317 char *mode_string[6] =318 { "4-bit", "5/3", "8-bit", "EPP-8", "EPP-16", "EPP-32" };319 320 epat_connect(pi);321 WR(0xa, 0x38); /* read the version code */322 ver = RR(0xb);323 epat_disconnect(pi);324 325 dev_info(&pi->dev,326 "Shuttle EPAT chip %x at 0x%x, mode %d (%s), delay %d\n",327 ver, pi->port, pi->mode, mode_string[pi->mode], pi->delay);328}329 330static struct pi_protocol epat = {331 .owner = THIS_MODULE,332 .name = "epat",333 .max_mode = 6,334 .epp_first = 3,335 .default_delay = 1,336 .max_units = 1,337 .write_regr = epat_write_regr,338 .read_regr = epat_read_regr,339 .write_block = epat_write_block,340 .read_block = epat_read_block,341 .connect = epat_connect,342 .disconnect = epat_disconnect,343 .test_proto = epat_test_proto,344 .log_adapter = epat_log_adapter,345};346 347static int __init epat_init(void)348{349#ifdef CONFIG_PATA_PARPORT_EPATC8350 epatc8 = 1;351#endif352 return pata_parport_register_driver(&epat);353}354 355static void __exit epat_exit(void)356{357 pata_parport_unregister_driver(&epat);358}359 360MODULE_LICENSE("GPL");361MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");362MODULE_DESCRIPTION("Shuttle Technologies EPAT parallel port IDE adapter "363 "protocol driver");364module_init(epat_init)365module_exit(epat_exit)366