1 /* 2 * eisa_enumerator.c - provide support for EISA adapters in PA-RISC machines 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Copyright (c) 2002 Daniel Engstrom <5116@telia.com> 10 * 11 */ 12 13 #include <linux/ioport.h> 14 #include <linux/init.h> 15 #include <linux/kernel.h> 16 #include <linux/slab.h> 17 #include <asm/io.h> 18 #include <linux/uaccess.h> 19 #include <asm/byteorder.h> 20 21 #include <asm/eisa_bus.h> 22 #include <asm/eisa_eeprom.h> 23 24 25 /* 26 * Todo: 27 * 28 * PORT init with MASK attr and other size than byte 29 * MEMORY with other decode than 20 bit 30 * CRC stuff 31 * FREEFORM stuff 32 */ 33 34 #define EPI 0xc80 35 #define NUM_SLOT 16 36 #define SLOT2PORT(x) (x<<12) 37 38 39 /* macros to handle unaligned accesses and 40 * byte swapping. The data in the EEPROM is 41 * little-endian on the big-endian PAROSC */ 42 #define get_8(x) (*(u_int8_t*)(x)) 43 44 static inline u_int16_t get_16(const unsigned char *x) 45 { 46 return (x[1] << 8) | x[0]; 47 } 48 49 static inline u_int32_t get_32(const unsigned char *x) 50 { 51 return (x[3] << 24) | (x[2] << 16) | (x[1] << 8) | x[0]; 52 } 53 54 static inline u_int32_t get_24(const unsigned char *x) 55 { 56 return (x[2] << 24) | (x[1] << 16) | (x[0] << 8); 57 } 58 59 static void print_eisa_id(char *s, u_int32_t id) 60 { 61 char vendor[4]; 62 int rev; 63 int device; 64 65 rev = id & 0xff; 66 id >>= 8; 67 device = id & 0xff; 68 id >>= 8; 69 vendor[3] = '\0'; 70 vendor[2] = '@' + (id & 0x1f); 71 id >>= 5; 72 vendor[1] = '@' + (id & 0x1f); 73 id >>= 5; 74 vendor[0] = '@' + (id & 0x1f); 75 id >>= 5; 76 77 sprintf(s, "%s%02X%02X", vendor, device, rev); 78 } 79 80 static int configure_memory(const unsigned char *buf, 81 struct resource *mem_parent, 82 char *name) 83 { 84 int len; 85 u_int8_t c; 86 int i; 87 struct resource *res; 88 89 len=0; 90 91 for (i=0;i<HPEE_MEMORY_MAX_ENT;i++) { 92 c = get_8(buf+len); 93 94 if (NULL != (res = kzalloc(sizeof(struct resource), GFP_KERNEL))) { 95 int result; 96 97 res->name = name; 98 res->start = mem_parent->start + get_24(buf+len+2); 99 res->end = res->start + get_16(buf+len+5)*1024; 100 res->flags = IORESOURCE_MEM; 101 printk("memory %lx-%lx ", (unsigned long)res->start, (unsigned long)res->end); 102 result = request_resource(mem_parent, res); 103 if (result < 0) { 104 printk(KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n"); 105 return result; 106 } 107 } 108 109 len+=7; 110 111 if (!(c & HPEE_MEMORY_MORE)) { 112 break; 113 } 114 } 115 116 return len; 117 } 118 119 120 static int configure_irq(const unsigned char *buf) 121 { 122 int len; 123 u_int8_t c; 124 int i; 125 126 len=0; 127 128 for (i=0;i<HPEE_IRQ_MAX_ENT;i++) { 129 c = get_8(buf+len); 130 131 printk("IRQ %d ", c & HPEE_IRQ_CHANNEL_MASK); 132 if (c & HPEE_IRQ_TRIG_LEVEL) { 133 eisa_make_irq_level(c & HPEE_IRQ_CHANNEL_MASK); 134 } else { 135 eisa_make_irq_edge(c & HPEE_IRQ_CHANNEL_MASK); 136 } 137 138 len+=2; 139 /* hpux seems to allow for 140 * two bytes of irq data but only defines one of 141 * them, I think */ 142 if (!(c & HPEE_IRQ_MORE)) { 143 break; 144 } 145 } 146 147 return len; 148 } 149 150 151 static int configure_dma(const unsigned char *buf) 152 { 153 int len; 154 u_int8_t c; 155 int i; 156 157 len=0; 158 159 for (i=0;i<HPEE_DMA_MAX_ENT;i++) { 160 c = get_8(buf+len); 161 printk("DMA %d ", c&HPEE_DMA_CHANNEL_MASK); 162 /* fixme: maybe initialize the dma channel withthe timing ? */ 163 len+=2; 164 if (!(c & HPEE_DMA_MORE)) { 165 break; 166 } 167 } 168 169 return len; 170 } 171 172 static int configure_port(const unsigned char *buf, struct resource *io_parent, 173 char *board) 174 { 175 int len; 176 u_int8_t c; 177 int i; 178 struct resource *res; 179 int result; 180 181 len=0; 182 183 for (i=0;i<HPEE_PORT_MAX_ENT;i++) { 184 c = get_8(buf+len); 185 186 if (NULL != (res = kzalloc(sizeof(struct resource), GFP_KERNEL))) { 187 res->name = board; 188 res->start = get_16(buf+len+1); 189 res->end = get_16(buf+len+1)+(c&HPEE_PORT_SIZE_MASK)+1; 190 res->flags = IORESOURCE_IO; 191 printk("ioports %lx-%lx ", (unsigned long)res->start, (unsigned long)res->end); 192 result = request_resource(io_parent, res); 193 if (result < 0) { 194 printk(KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n"); 195 return result; 196 } 197 } 198 199 len+=3; 200 if (!(c & HPEE_PORT_MORE)) { 201 break; 202 } 203 } 204 205 return len; 206 } 207 208 209 /* byte 1 and 2 is the port number to write 210 * and at byte 3 the value to write starts. 211 * I assume that there are and- and or- masks 212 * here when HPEE_PORT_INIT_MASK is set but I have 213 * not yet encountered this. */ 214 static int configure_port_init(const unsigned char *buf) 215 { 216 int len=0; 217 u_int8_t c; 218 219 while (len<HPEE_PORT_INIT_MAX_LEN) { 220 int s=0; 221 c = get_8(buf+len); 222 223 switch (c & HPEE_PORT_INIT_WIDTH_MASK) { 224 case HPEE_PORT_INIT_WIDTH_BYTE: 225 s=1; 226 if (c & HPEE_PORT_INIT_MASK) { 227 printk(KERN_WARNING "port_init: unverified mask attribute\n"); 228 outb((inb(get_16(buf+len+1) & 229 get_8(buf+len+3)) | 230 get_8(buf+len+4)), get_16(buf+len+1)); 231 232 } else { 233 outb(get_8(buf+len+3), get_16(buf+len+1)); 234 235 } 236 break; 237 case HPEE_PORT_INIT_WIDTH_WORD: 238 s=2; 239 if (c & HPEE_PORT_INIT_MASK) { 240 printk(KERN_WARNING "port_init: unverified mask attribute\n"); 241 outw((inw(get_16(buf+len+1)) & 242 get_16(buf+len+3)) | 243 get_16(buf+len+5), 244 get_16(buf+len+1)); 245 } else { 246 outw(cpu_to_le16(get_16(buf+len+3)), get_16(buf+len+1)); 247 } 248 break; 249 case HPEE_PORT_INIT_WIDTH_DWORD: 250 s=4; 251 if (c & HPEE_PORT_INIT_MASK) { 252 printk(KERN_WARNING "port_init: unverified mask attribute\n"); 253 outl((inl(get_16(buf+len+1) & 254 get_32(buf+len+3)) | 255 get_32(buf+len+7)), get_16(buf+len+1)); 256 } else { 257 outl(cpu_to_le32(get_32(buf+len+3)), get_16(buf+len+1)); 258 } 259 260 break; 261 default: 262 printk(KERN_ERR "Invalid port init word %02x\n", c); 263 return 0; 264 } 265 266 if (c & HPEE_PORT_INIT_MASK) { 267 s*=2; 268 } 269 270 len+=s+3; 271 if (!(c & HPEE_PORT_INIT_MORE)) { 272 break; 273 } 274 } 275 276 return len; 277 } 278 279 static int configure_choise(const unsigned char *buf, u_int8_t *info) 280 { 281 int len; 282 283 /* theis record contain the value of the functions 284 * configuration choises and an info byte which 285 * describes which other records to expect in this 286 * function */ 287 len = get_8(buf); 288 *info=get_8(buf+len+1); 289 290 return len+2; 291 } 292 293 static int configure_type_string(const unsigned char *buf) 294 { 295 int len; 296 297 /* just skip past the type field */ 298 len = get_8(buf); 299 if (len > 80) { 300 printk(KERN_ERR "eisa_enumerator: type info field too long (%d, max is 80)\n", len); 301 } 302 303 return 1+len; 304 } 305 306 static int configure_function(const unsigned char *buf, int *more) 307 { 308 /* the init field seems to be a two-byte field 309 * which is non-zero if there are an other function following 310 * I think it is the length of the function def 311 */ 312 *more = get_16(buf); 313 314 return 2; 315 } 316 317 static int parse_slot_config(int slot, 318 const unsigned char *buf, 319 struct eeprom_eisa_slot_info *es, 320 struct resource *io_parent, 321 struct resource *mem_parent) 322 { 323 int res=0; 324 int function_len; 325 unsigned int pos=0; 326 unsigned int maxlen; 327 int num_func=0; 328 u_int8_t flags; 329 int p0; 330 331 char *board; 332 int id_string_used=0; 333 334 if (NULL == (board = kmalloc(8, GFP_KERNEL))) { 335 return -1; 336 } 337 print_eisa_id(board, es->eisa_slot_id); 338 printk(KERN_INFO "EISA slot %d: %s %s ", 339 slot, board, es->flags&HPEE_FLAG_BOARD_IS_ISA ? "ISA" : "EISA"); 340 341 maxlen = es->config_data_length < HPEE_MAX_LENGTH ? 342 es->config_data_length : HPEE_MAX_LENGTH; 343 while ((pos < maxlen) && (num_func <= es->num_functions)) { 344 pos+=configure_function(buf+pos, &function_len); 345 346 if (!function_len) { 347 break; 348 } 349 num_func++; 350 p0 = pos; 351 pos += configure_choise(buf+pos, &flags); 352 353 if (flags & HPEE_FUNCTION_INFO_F_DISABLED) { 354 /* function disabled, skip silently */ 355 pos = p0 + function_len; 356 continue; 357 } 358 if (flags & HPEE_FUNCTION_INFO_CFG_FREE_FORM) { 359 /* I have no idea how to handle this */ 360 printk("function %d have free-form configuration, skipping ", 361 num_func); 362 pos = p0 + function_len; 363 continue; 364 } 365 366 /* the ordering of the sections need 367 * more investigation. 368 * Currently I think that memory comaed before IRQ 369 * I assume the order is LSB to MSB in the 370 * info flags 371 * eg type, memory, irq, dma, port, HPEE_PORT_init 372 */ 373 374 if (flags & HPEE_FUNCTION_INFO_HAVE_TYPE) { 375 pos += configure_type_string(buf+pos); 376 } 377 378 if (flags & HPEE_FUNCTION_INFO_HAVE_MEMORY) { 379 id_string_used=1; 380 pos += configure_memory(buf+pos, mem_parent, board); 381 } 382 383 if (flags & HPEE_FUNCTION_INFO_HAVE_IRQ) { 384 pos += configure_irq(buf+pos); 385 } 386 387 if (flags & HPEE_FUNCTION_INFO_HAVE_DMA) { 388 pos += configure_dma(buf+pos); 389 } 390 391 if (flags & HPEE_FUNCTION_INFO_HAVE_PORT) { 392 id_string_used=1; 393 pos += configure_port(buf+pos, io_parent, board); 394 } 395 396 if (flags & HPEE_FUNCTION_INFO_HAVE_PORT_INIT) { 397 pos += configure_port_init(buf+pos); 398 } 399 400 if (p0 + function_len < pos) { 401 printk(KERN_ERR "eisa_enumerator: function %d length mis-match " 402 "got %d, expected %d\n", 403 num_func, pos-p0, function_len); 404 res=-1; 405 break; 406 } 407 pos = p0 + function_len; 408 } 409 printk("\n"); 410 if (!id_string_used) { 411 kfree(board); 412 } 413 414 if (pos != es->config_data_length) { 415 printk(KERN_ERR "eisa_enumerator: config data length mis-match got %d, expected %d\n", 416 pos, es->config_data_length); 417 res=-1; 418 } 419 420 if (num_func != es->num_functions) { 421 printk(KERN_ERR "eisa_enumerator: number of functions mis-match got %d, expected %d\n", 422 num_func, es->num_functions); 423 res=-2; 424 } 425 426 return res; 427 428 } 429 430 static int init_slot(int slot, struct eeprom_eisa_slot_info *es) 431 { 432 unsigned int id; 433 434 char id_string[8]; 435 436 if (!(es->slot_info&HPEE_SLOT_INFO_NO_READID)) { 437 /* try to read the id of the board in the slot */ 438 id = le32_to_cpu(inl(SLOT2PORT(slot)+EPI)); 439 440 if (0xffffffff == id) { 441 /* Maybe we didn't expect a card to be here... */ 442 if (es->eisa_slot_id == 0xffffffff) 443 return -1; 444 445 /* this board is not here or it does not 446 * support readid 447 */ 448 printk(KERN_ERR "EISA slot %d a configured board was not detected (", 449 slot); 450 451 print_eisa_id(id_string, es->eisa_slot_id); 452 printk(" expected %s)\n", id_string); 453 454 return -1; 455 456 } 457 if (es->eisa_slot_id != id) { 458 print_eisa_id(id_string, id); 459 printk(KERN_ERR "EISA slot %d id mis-match: got %s", 460 slot, id_string); 461 462 print_eisa_id(id_string, es->eisa_slot_id); 463 printk(" expected %s\n", id_string); 464 465 return -1; 466 467 } 468 } 469 470 /* now: we need to enable the board if 471 * it supports enabling and run through 472 * the port init sction if present 473 * and finally record any interrupt polarity 474 */ 475 if (es->slot_features & HPEE_SLOT_FEATURES_ENABLE) { 476 /* enable board */ 477 outb(0x01| inb(SLOT2PORT(slot)+EPI+4), 478 SLOT2PORT(slot)+EPI+4); 479 } 480 481 return 0; 482 } 483 484 485 int eisa_enumerator(unsigned long eeprom_addr, 486 struct resource *io_parent, struct resource *mem_parent) 487 { 488 int i; 489 struct eeprom_header *eh; 490 static char eeprom_buf[HPEE_MAX_LENGTH]; 491 492 for (i=0; i < HPEE_MAX_LENGTH; i++) { 493 eeprom_buf[i] = gsc_readb(eeprom_addr+i); 494 } 495 496 printk(KERN_INFO "Enumerating EISA bus\n"); 497 498 eh = (struct eeprom_header*)(eeprom_buf); 499 for (i=0;i<eh->num_slots;i++) { 500 struct eeprom_eisa_slot_info *es; 501 502 es = (struct eeprom_eisa_slot_info*) 503 (&eeprom_buf[HPEE_SLOT_INFO(i)]); 504 505 if (-1==init_slot(i+1, es)) { 506 continue; 507 } 508 509 if (es->config_data_offset < HPEE_MAX_LENGTH) { 510 if (parse_slot_config(i+1, &eeprom_buf[es->config_data_offset], 511 es, io_parent, mem_parent)) { 512 return -1; 513 } 514 } else { 515 printk (KERN_WARNING "EISA EEPROM offset 0x%x out of range\n",es->config_data_offset); 516 return -1; 517 } 518 } 519 return eh->num_slots; 520 } 521 522