1 /* 2 epat.c (c) 1997-8 Grant R. Guenther <grant@torque.net> 3 Under the terms of the GNU General Public License. 4 5 This is the low level protocol driver for the EPAT parallel 6 to IDE adapter from Shuttle Technologies. This adapter is 7 used in many popular parallel port disk products such as the 8 SyQuest EZ drives, the Avatar Shark and the Imation SuperDisk. 9 10 */ 11 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/delay.h> 15 #include <linux/kernel.h> 16 #include <linux/types.h> 17 #include <linux/wait.h> 18 #include <asm/io.h> 19 #include "pata_parport.h" 20 21 #define j44(a,b) (((a>>4)&0x0f)+(b&0xf0)) 22 #define j53(a,b) (((a>>3)&0x1f)+((b<<4)&0xe0)) 23 24 static int epatc8; 25 26 module_param(epatc8, int, 0); 27 MODULE_PARM_DESC(epatc8, "support for the Shuttle EP1284 chip, " 28 "used in any recent Imation SuperDisk (LS-120) drive."); 29 30 /* cont = 0 IDE register file 31 cont = 1 IDE control registers 32 cont = 2 internal EPAT registers 33 */ 34 35 static int cont_map[3] = { 0x18, 0x10, 0 }; 36 37 static void epat_write_regr(struct pi_adapter *pi, int cont, int regr, int val) 38 39 { int r; 40 41 r = regr + cont_map[cont]; 42 43 switch (pi->mode) { 44 45 case 0: 46 case 1: 47 case 2: w0(0x60+r); w2(1); w0(val); w2(4); 48 break; 49 50 case 3: 51 case 4: 52 case 5: w3(0x40+r); w4(val); 53 break; 54 55 } 56 } 57 58 static int epat_read_regr(struct pi_adapter *pi, int cont, int regr) 59 60 { int a, b, r; 61 62 r = regr + cont_map[cont]; 63 64 switch (pi->mode) { 65 66 case 0: w0(r); w2(1); w2(3); 67 a = r1(); w2(4); b = r1(); 68 return j44(a,b); 69 70 case 1: w0(0x40+r); w2(1); w2(4); 71 a = r1(); b = r2(); w0(0xff); 72 return j53(a,b); 73 74 case 2: w0(0x20+r); w2(1); w2(0x25); 75 a = r0(); w2(4); 76 return a; 77 78 case 3: 79 case 4: 80 case 5: w3(r); w2(0x24); a = r4(); w2(4); 81 return a; 82 83 } 84 return -1; /* never gets here */ 85 } 86 87 static void epat_read_block(struct pi_adapter *pi, char *buf, int count) 88 89 { int k, ph, a, b; 90 91 switch (pi->mode) { 92 93 case 0: w0(7); w2(1); w2(3); w0(0xff); 94 ph = 0; 95 for(k=0;k<count;k++) { 96 if (k == count-1) w0(0xfd); 97 w2(6+ph); a = r1(); 98 if (a & 8) b = a; 99 else { w2(4+ph); b = r1(); } 100 buf[k] = j44(a,b); 101 ph = 1 - ph; 102 } 103 w0(0); w2(4); 104 break; 105 106 case 1: w0(0x47); w2(1); w2(5); w0(0xff); 107 ph = 0; 108 for(k=0;k<count;k++) { 109 if (k == count-1) w0(0xfd); 110 w2(4+ph); 111 a = r1(); b = r2(); 112 buf[k] = j53(a,b); 113 ph = 1 - ph; 114 } 115 w0(0); w2(4); 116 break; 117 118 case 2: w0(0x27); w2(1); w2(0x25); w0(0); 119 ph = 0; 120 for(k=0;k<count-1;k++) { 121 w2(0x24+ph); 122 buf[k] = r0(); 123 ph = 1 - ph; 124 } 125 w2(0x26); w2(0x27); buf[count-1] = r0(); 126 w2(0x25); w2(4); 127 break; 128 129 case 3: w3(0x80); w2(0x24); 130 for(k=0;k<count-1;k++) buf[k] = r4(); 131 w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4(); 132 w2(4); 133 break; 134 135 case 4: w3(0x80); w2(0x24); 136 for(k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w(); 137 buf[count-2] = r4(); 138 w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4(); 139 w2(4); 140 break; 141 142 case 5: w3(0x80); w2(0x24); 143 for(k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l(); 144 for(k=count-4;k<count-1;k++) buf[k] = r4(); 145 w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4(); 146 w2(4); 147 break; 148 149 } 150 } 151 152 static void epat_write_block(struct pi_adapter *pi, char *buf, int count) 153 154 { int ph, k; 155 156 switch (pi->mode) { 157 158 case 0: 159 case 1: 160 case 2: w0(0x67); w2(1); w2(5); 161 ph = 0; 162 for(k=0;k<count;k++) { 163 w0(buf[k]); 164 w2(4+ph); 165 ph = 1 - ph; 166 } 167 w2(7); w2(4); 168 break; 169 170 case 3: w3(0xc0); 171 for(k=0;k<count;k++) w4(buf[k]); 172 w2(4); 173 break; 174 175 case 4: w3(0xc0); 176 for(k=0;k<(count/2);k++) w4w(((u16 *)buf)[k]); 177 w2(4); 178 break; 179 180 case 5: w3(0xc0); 181 for(k=0;k<(count/4);k++) w4l(((u32 *)buf)[k]); 182 w2(4); 183 break; 184 185 } 186 } 187 188 /* these macros access the EPAT registers in native addressing */ 189 190 #define WR(r,v) epat_write_regr(pi,2,r,v) 191 #define RR(r) (epat_read_regr(pi,2,r)) 192 193 /* and these access the IDE task file */ 194 195 #define WRi(r,v) epat_write_regr(pi,0,r,v) 196 #define RRi(r) (epat_read_regr(pi,0,r)) 197 198 /* FIXME: the CPP stuff should be fixed to handle multiple EPATs on a chain */ 199 200 #define CPP(x) w2(4);w0(0x22);w0(0xaa);w0(0x55);w0(0);w0(0xff);\ 201 w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff); 202 203 static void epat_connect(struct pi_adapter *pi) 204 205 { pi->saved_r0 = r0(); 206 pi->saved_r2 = r2(); 207 208 /* Initialize the chip */ 209 CPP(0); 210 211 if (epatc8) { 212 CPP(0x40);CPP(0xe0); 213 w0(0);w2(1);w2(4); 214 WR(0x8,0x12);WR(0xc,0x14);WR(0x12,0x10); 215 WR(0xe,0xf);WR(0xf,4); 216 /* WR(0xe,0xa);WR(0xf,4); */ 217 WR(0xe,0xd);WR(0xf,0); 218 /* CPP(0x30); */ 219 } 220 221 /* Connect to the chip */ 222 CPP(0xe0); 223 w0(0);w2(1);w2(4); /* Idle into SPP */ 224 if (pi->mode >= 3) { 225 w0(0);w2(1);w2(4);w2(0xc); 226 /* Request EPP */ 227 w0(0x40);w2(6);w2(7);w2(4);w2(0xc);w2(4); 228 } 229 230 if (!epatc8) { 231 WR(8,0x10); WR(0xc,0x14); WR(0xa,0x38); WR(0x12,0x10); 232 } 233 } 234 235 static void epat_disconnect(struct pi_adapter *pi) 236 { CPP(0x30); 237 w0(pi->saved_r0); 238 w2(pi->saved_r2); 239 } 240 241 static int epat_test_proto(struct pi_adapter *pi) 242 243 { int k, j, f, cc; 244 int e[2] = {0,0}; 245 char scratch[512]; 246 247 epat_connect(pi); 248 cc = RR(0xd); 249 epat_disconnect(pi); 250 251 epat_connect(pi); 252 for (j=0;j<2;j++) { 253 WRi(6,0xa0+j*0x10); 254 for (k=0;k<256;k++) { 255 WRi(2,k^0xaa); 256 WRi(3,k^0x55); 257 if (RRi(2) != (k^0xaa)) e[j]++; 258 } 259 } 260 epat_disconnect(pi); 261 262 f = 0; 263 epat_connect(pi); 264 WR(0x13,1); WR(0x13,0); WR(0xa,0x11); 265 epat_read_block(pi,scratch,512); 266 267 for (k=0;k<256;k++) { 268 if ((scratch[2*k] & 0xff) != k) f++; 269 if ((scratch[2*k+1] & 0xff) != (0xff-k)) f++; 270 } 271 epat_disconnect(pi); 272 273 dev_dbg(&pi->dev, "epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n", 274 pi->port, pi->mode, cc, e[0], e[1], f); 275 276 return (e[0] && e[1]) || f; 277 } 278 279 static void epat_log_adapter(struct pi_adapter *pi) 280 281 { int ver; 282 char *mode_string[6] = 283 {"4-bit","5/3","8-bit","EPP-8","EPP-16","EPP-32"}; 284 285 epat_connect(pi); 286 WR(0xa,0x38); /* read the version code */ 287 ver = RR(0xb); 288 epat_disconnect(pi); 289 290 dev_info(&pi->dev, "Shuttle EPAT chip %x at 0x%x, mode %d (%s), delay %d\n", 291 ver, pi->port, pi->mode, mode_string[pi->mode], pi->delay); 292 } 293 294 static struct pi_protocol epat = { 295 .owner = THIS_MODULE, 296 .name = "epat", 297 .max_mode = 6, 298 .epp_first = 3, 299 .default_delay = 1, 300 .max_units = 1, 301 .write_regr = epat_write_regr, 302 .read_regr = epat_read_regr, 303 .write_block = epat_write_block, 304 .read_block = epat_read_block, 305 .connect = epat_connect, 306 .disconnect = epat_disconnect, 307 .test_proto = epat_test_proto, 308 .log_adapter = epat_log_adapter, 309 }; 310 311 static int __init epat_init(void) 312 { 313 #ifdef CONFIG_PATA_PARPORT_EPATC8 314 epatc8 = 1; 315 #endif 316 return pata_parport_register_driver(&epat); 317 } 318 319 static void __exit epat_exit(void) 320 { 321 pata_parport_unregister_driver(&epat); 322 } 323 324 MODULE_LICENSE("GPL"); 325 module_init(epat_init) 326 module_exit(epat_exit) 327