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 /* Changes: 13 14 1.01 GRG 1998.05.06 init_proto, release_proto 15 1.02 Joshua b. Jore CPP(renamed), epat_connect, epat_disconnect 16 17 */ 18 19 #define EPAT_VERSION "1.02" 20 21 #include <linux/module.h> 22 #include <linux/init.h> 23 #include <linux/delay.h> 24 #include <linux/kernel.h> 25 #include <linux/types.h> 26 #include <linux/wait.h> 27 #include <asm/io.h> 28 29 #include <linux/pata_parport.h> 30 31 #define j44(a,b) (((a>>4)&0x0f)+(b&0xf0)) 32 #define j53(a,b) (((a>>3)&0x1f)+((b<<4)&0xe0)) 33 34 static int epatc8; 35 36 module_param(epatc8, int, 0); 37 MODULE_PARM_DESC(epatc8, "support for the Shuttle EP1284 chip, " 38 "used in any recent Imation SuperDisk (LS-120) drive."); 39 40 /* cont = 0 IDE register file 41 cont = 1 IDE control registers 42 cont = 2 internal EPAT registers 43 */ 44 45 static int cont_map[3] = { 0x18, 0x10, 0 }; 46 47 static void epat_write_regr( PIA *pi, int cont, int regr, int val) 48 49 { int r; 50 51 r = regr + cont_map[cont]; 52 53 switch (pi->mode) { 54 55 case 0: 56 case 1: 57 case 2: w0(0x60+r); w2(1); w0(val); w2(4); 58 break; 59 60 case 3: 61 case 4: 62 case 5: w3(0x40+r); w4(val); 63 break; 64 65 } 66 } 67 68 static int epat_read_regr( PIA *pi, int cont, int regr ) 69 70 { int a, b, r; 71 72 r = regr + cont_map[cont]; 73 74 switch (pi->mode) { 75 76 case 0: w0(r); w2(1); w2(3); 77 a = r1(); w2(4); b = r1(); 78 return j44(a,b); 79 80 case 1: w0(0x40+r); w2(1); w2(4); 81 a = r1(); b = r2(); w0(0xff); 82 return j53(a,b); 83 84 case 2: w0(0x20+r); w2(1); w2(0x25); 85 a = r0(); w2(4); 86 return a; 87 88 case 3: 89 case 4: 90 case 5: w3(r); w2(0x24); a = r4(); w2(4); 91 return a; 92 93 } 94 return -1; /* never gets here */ 95 } 96 97 static void epat_read_block( PIA *pi, char * buf, int count ) 98 99 { int k, ph, a, b; 100 101 switch (pi->mode) { 102 103 case 0: w0(7); w2(1); w2(3); w0(0xff); 104 ph = 0; 105 for(k=0;k<count;k++) { 106 if (k == count-1) w0(0xfd); 107 w2(6+ph); a = r1(); 108 if (a & 8) b = a; 109 else { w2(4+ph); b = r1(); } 110 buf[k] = j44(a,b); 111 ph = 1 - ph; 112 } 113 w0(0); w2(4); 114 break; 115 116 case 1: w0(0x47); w2(1); w2(5); w0(0xff); 117 ph = 0; 118 for(k=0;k<count;k++) { 119 if (k == count-1) w0(0xfd); 120 w2(4+ph); 121 a = r1(); b = r2(); 122 buf[k] = j53(a,b); 123 ph = 1 - ph; 124 } 125 w0(0); w2(4); 126 break; 127 128 case 2: w0(0x27); w2(1); w2(0x25); w0(0); 129 ph = 0; 130 for(k=0;k<count-1;k++) { 131 w2(0x24+ph); 132 buf[k] = r0(); 133 ph = 1 - ph; 134 } 135 w2(0x26); w2(0x27); buf[count-1] = r0(); 136 w2(0x25); w2(4); 137 break; 138 139 case 3: w3(0x80); w2(0x24); 140 for(k=0;k<count-1;k++) buf[k] = r4(); 141 w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4(); 142 w2(4); 143 break; 144 145 case 4: w3(0x80); w2(0x24); 146 for(k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w(); 147 buf[count-2] = r4(); 148 w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4(); 149 w2(4); 150 break; 151 152 case 5: w3(0x80); w2(0x24); 153 for(k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l(); 154 for(k=count-4;k<count-1;k++) buf[k] = r4(); 155 w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4(); 156 w2(4); 157 break; 158 159 } 160 } 161 162 static void epat_write_block( PIA *pi, char * buf, int count ) 163 164 { int ph, k; 165 166 switch (pi->mode) { 167 168 case 0: 169 case 1: 170 case 2: w0(0x67); w2(1); w2(5); 171 ph = 0; 172 for(k=0;k<count;k++) { 173 w0(buf[k]); 174 w2(4+ph); 175 ph = 1 - ph; 176 } 177 w2(7); w2(4); 178 break; 179 180 case 3: w3(0xc0); 181 for(k=0;k<count;k++) w4(buf[k]); 182 w2(4); 183 break; 184 185 case 4: w3(0xc0); 186 for(k=0;k<(count/2);k++) w4w(((u16 *)buf)[k]); 187 w2(4); 188 break; 189 190 case 5: w3(0xc0); 191 for(k=0;k<(count/4);k++) w4l(((u32 *)buf)[k]); 192 w2(4); 193 break; 194 195 } 196 } 197 198 /* these macros access the EPAT registers in native addressing */ 199 200 #define WR(r,v) epat_write_regr(pi,2,r,v) 201 #define RR(r) (epat_read_regr(pi,2,r)) 202 203 /* and these access the IDE task file */ 204 205 #define WRi(r,v) epat_write_regr(pi,0,r,v) 206 #define RRi(r) (epat_read_regr(pi,0,r)) 207 208 /* FIXME: the CPP stuff should be fixed to handle multiple EPATs on a chain */ 209 210 #define CPP(x) w2(4);w0(0x22);w0(0xaa);w0(0x55);w0(0);w0(0xff);\ 211 w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff); 212 213 static void epat_connect ( PIA *pi ) 214 215 { pi->saved_r0 = r0(); 216 pi->saved_r2 = r2(); 217 218 /* Initialize the chip */ 219 CPP(0); 220 221 if (epatc8) { 222 CPP(0x40);CPP(0xe0); 223 w0(0);w2(1);w2(4); 224 WR(0x8,0x12);WR(0xc,0x14);WR(0x12,0x10); 225 WR(0xe,0xf);WR(0xf,4); 226 /* WR(0xe,0xa);WR(0xf,4); */ 227 WR(0xe,0xd);WR(0xf,0); 228 /* CPP(0x30); */ 229 } 230 231 /* Connect to the chip */ 232 CPP(0xe0); 233 w0(0);w2(1);w2(4); /* Idle into SPP */ 234 if (pi->mode >= 3) { 235 w0(0);w2(1);w2(4);w2(0xc); 236 /* Request EPP */ 237 w0(0x40);w2(6);w2(7);w2(4);w2(0xc);w2(4); 238 } 239 240 if (!epatc8) { 241 WR(8,0x10); WR(0xc,0x14); WR(0xa,0x38); WR(0x12,0x10); 242 } 243 } 244 245 static void epat_disconnect (PIA *pi) 246 { CPP(0x30); 247 w0(pi->saved_r0); 248 w2(pi->saved_r2); 249 } 250 251 static int epat_test_proto( PIA *pi, char * scratch, int verbose ) 252 253 { int k, j, f, cc; 254 int e[2] = {0,0}; 255 256 epat_connect(pi); 257 cc = RR(0xd); 258 epat_disconnect(pi); 259 260 epat_connect(pi); 261 for (j=0;j<2;j++) { 262 WRi(6,0xa0+j*0x10); 263 for (k=0;k<256;k++) { 264 WRi(2,k^0xaa); 265 WRi(3,k^0x55); 266 if (RRi(2) != (k^0xaa)) e[j]++; 267 } 268 } 269 epat_disconnect(pi); 270 271 f = 0; 272 epat_connect(pi); 273 WR(0x13,1); WR(0x13,0); WR(0xa,0x11); 274 epat_read_block(pi,scratch,512); 275 276 for (k=0;k<256;k++) { 277 if ((scratch[2*k] & 0xff) != k) f++; 278 if ((scratch[2*k+1] & 0xff) != (0xff-k)) f++; 279 } 280 epat_disconnect(pi); 281 282 if (verbose) { 283 printk("%s: epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n", 284 pi->device,pi->port,pi->mode,cc,e[0],e[1],f); 285 } 286 287 return (e[0] && e[1]) || f; 288 } 289 290 static void epat_log_adapter( PIA *pi, char * scratch, int verbose ) 291 292 { int ver; 293 char *mode_string[6] = 294 {"4-bit","5/3","8-bit","EPP-8","EPP-16","EPP-32"}; 295 296 epat_connect(pi); 297 WR(0xa,0x38); /* read the version code */ 298 ver = RR(0xb); 299 epat_disconnect(pi); 300 301 printk("%s: epat %s, Shuttle EPAT chip %x at 0x%x, ", 302 pi->device,EPAT_VERSION,ver,pi->port); 303 printk("mode %d (%s), delay %d\n",pi->mode, 304 mode_string[pi->mode],pi->delay); 305 306 } 307 308 static struct pi_protocol epat = { 309 .owner = THIS_MODULE, 310 .name = "epat", 311 .max_mode = 6, 312 .epp_first = 3, 313 .default_delay = 1, 314 .max_units = 1, 315 .write_regr = epat_write_regr, 316 .read_regr = epat_read_regr, 317 .write_block = epat_write_block, 318 .read_block = epat_read_block, 319 .connect = epat_connect, 320 .disconnect = epat_disconnect, 321 .test_proto = epat_test_proto, 322 .log_adapter = epat_log_adapter, 323 }; 324 325 static int __init epat_init(void) 326 { 327 #ifdef CONFIG_PARIDE_EPATC8 328 epatc8 = 1; 329 #endif 330 return paride_register(&epat); 331 } 332 333 static void __exit epat_exit(void) 334 { 335 paride_unregister(&epat); 336 } 337 338 MODULE_LICENSE("GPL"); 339 module_init(epat_init) 340 module_exit(epat_exit) 341