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 <asm/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 44static inline u_int16_t get_16(const unsigned char *x) 45{ 46 return (x[1] << 8) | x[0]; 47} 48 49static 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 54static inline u_int32_t get_24(const unsigned char *x) 55{ 56 return (x[2] << 24) | (x[1] << 16) | (x[0] << 8); 57} 58 59static 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 80static 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 = kmalloc(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 ", res->start, res->end); 102 result = request_resource(mem_parent, res); 103 if (result < 0) { 104 printk("\n" 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 120static 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 151static 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 len+=2; 163 if (!(c & HPEE_DMA_MORE)) { 164 break; 165 } 166 } 167 168 return len; 169} 170 171static int configure_port(const unsigned char *buf, struct resource *io_parent, 172 char *board) 173{ 174 int len; 175 u_int8_t c; 176 int i; 177 struct resource *res; 178 int result; 179 180 len=0; 181 182 for (i=0;i<HPEE_PORT_MAX_ENT;i++) { 183 c = get_8(buf+len); 184 185 if (NULL != (res = kmalloc(sizeof(struct resource), GFP_KERNEL))) { 186 res->name = board; 187 res->start = get_16(buf+len+1); 188 res->end = get_16(buf+len+1)+(c&HPEE_PORT_SIZE_MASK)+1; 189 res->flags = IORESOURCE_IO; 190 printk("ioports %lx-%lx ", res->start, res->end); 191 result = request_resource(io_parent, res); 192 if (result < 0) { 193 printk("\n" KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n"); 194 return result; 195 } 196 } 197 198 len+=3; 199 if (!(c & HPEE_PORT_MORE)) { 200 break; 201 } 202 } 203 204 return len; 205} 206 207 208/* byte 1 and 2 is the port number to write 209 * and at byte 3 the value to write starts. 210 * I assume that there are and- and or- masks 211 * here when HPEE_PORT_INIT_MASK is set but I have 212 * not yet encountered this. */ 213static int configure_port_init(const unsigned char *buf) 214{ 215 int len=0; 216 u_int8_t c; 217 218 while (len<HPEE_PORT_INIT_MAX_LEN) { 219 int s=0; 220 c = get_8(buf+len); 221 222 switch (c & HPEE_PORT_INIT_WIDTH_MASK) { 223 case HPEE_PORT_INIT_WIDTH_BYTE: 224 s=1; 225 if (c & HPEE_PORT_INIT_MASK) { 226 printk("\n" KERN_WARNING "port_init: unverified mask attribute\n"); 227 outb((inb(get_16(buf+len+1) & 228 get_8(buf+len+3)) | 229 get_8(buf+len+4)), get_16(buf+len+1)); 230 231 } else { 232 outb(get_8(buf+len+3), get_16(buf+len+1)); 233 234 } 235 break; 236 case HPEE_PORT_INIT_WIDTH_WORD: 237 s=2; 238 if (c & HPEE_PORT_INIT_MASK) { 239 printk(KERN_WARNING "port_init: unverified mask attribute\n"); 240 outw((inw(get_16(buf+len+1)) & 241 get_16(buf+len+3)) | 242 get_16(buf+len+5), 243 get_16(buf+len+1)); 244 } else { 245 outw(cpu_to_le16(get_16(buf+len+3)), get_16(buf+len+1)); 246 } 247 break; 248 case HPEE_PORT_INIT_WIDTH_DWORD: 249 s=4; 250 if (c & HPEE_PORT_INIT_MASK) { 251 printk("\n" KERN_WARNING "port_init: unverified mask attribute\n"); 252 outl((inl(get_16(buf+len+1) & 253 get_32(buf+len+3)) | 254 get_32(buf+len+7)), get_16(buf+len+1)); 255 } else { 256 outl(cpu_to_le32(get_32(buf+len+3)), get_16(buf+len+1)); 257 } 258 259 break; 260 default: 261 printk("\n" KERN_ERR "Invalid port init word %02x\n", c); 262 return 0; 263 } 264 265 if (c & HPEE_PORT_INIT_MASK) { 266 s*=2; 267 } 268 269 len+=s+3; 270 if (!(c & HPEE_PORT_INIT_MORE)) { 271 break; 272 } 273 } 274 275 return len; 276} 277 278static int configure_choise(const unsigned char *buf, u_int8_t *info) 279{ 280 int len; 281 282 /* theis record contain the value of the functions 283 * configuration choises and an info byte which 284 * describes which other records to expect in this 285 * function */ 286 len = get_8(buf); 287 *info=get_8(buf+len+1); 288 289 return len+2; 290} 291 292static int configure_type_string(const unsigned char *buf) 293{ 294 int len; 295 296 /* just skip past the type field */ 297 len = get_8(buf); 298 if (len > 80) { 299 printk("\n" KERN_ERR "eisa_enumerator: type info field too long (%d, max is 80)\n", len); 300 } 301 302 return 1+len; 303} 304 305static int configure_function(const unsigned char *buf, int *more) 306{ 307 /* the init field seems to be a two-byte field 308 * which is non-zero if there are an other function following 309 * I think it is the length of the function def 310 */ 311 *more = get_16(buf); 312 313 return 2; 314} 315 316static int parse_slot_config(int slot, 317 const unsigned char *buf, 318 struct eeprom_eisa_slot_info *es, 319 struct resource *io_parent, 320 struct resource *mem_parent) 321{ 322 int res=0; 323 int function_len; 324 unsigned int pos=0; 325 unsigned int maxlen; 326 int num_func=0; 327 u_int8_t flags; 328 int p0; 329 330 char *board; 331 int id_string_used=0; 332 333 if (NULL == (board = kmalloc(8, GFP_KERNEL))) { 334 return -1; 335 } 336 print_eisa_id(board, es->eisa_slot_id); 337 printk(KERN_INFO "EISA slot %d: %s %s ", 338 slot, board, es->flags&HPEE_FLAG_BOARD_IS_ISA ? "ISA" : "EISA"); 339 340 maxlen = es->config_data_length < HPEE_MAX_LENGTH ? 341 es->config_data_length : HPEE_MAX_LENGTH; 342 while ((pos < maxlen) && (num_func <= es->num_functions)) { 343 pos+=configure_function(buf+pos, &function_len); 344 345 if (!function_len) { 346 break; 347 } 348 num_func++; 349 p0 = pos; 350 pos += configure_choise(buf+pos, &flags); 351 352 if (flags & HPEE_FUNCTION_INFO_F_DISABLED) { 353 /* function disabled, skip silently */ 354 pos = p0 + function_len; 355 continue; 356 } 357 if (flags & HPEE_FUNCTION_INFO_CFG_FREE_FORM) { 358 /* I have no idea how to handle this */ 359 printk("function %d have free-form confgiuration, skipping ", 360 num_func); 361 pos = p0 + function_len; 362 continue; 363 } 364 365 /* the ordering of the sections need 366 * more investigation. 367 * Currently I think that memory comaed before IRQ 368 * I assume the order is LSB to MSB in the 369 * info flags 370 * eg type, memory, irq, dma, port, HPEE_PORT_init 371 */ 372 373 if (flags & HPEE_FUNCTION_INFO_HAVE_TYPE) { 374 pos += configure_type_string(buf+pos); 375 } 376 377 if (flags & HPEE_FUNCTION_INFO_HAVE_MEMORY) { 378 id_string_used=1; 379 pos += configure_memory(buf+pos, mem_parent, board); 380 } 381 382 if (flags & HPEE_FUNCTION_INFO_HAVE_IRQ) { 383 pos += configure_irq(buf+pos); 384 } 385 386 if (flags & HPEE_FUNCTION_INFO_HAVE_DMA) { 387 pos += configure_dma(buf+pos); 388 } 389 390 if (flags & HPEE_FUNCTION_INFO_HAVE_PORT) { 391 id_string_used=1; 392 pos += configure_port(buf+pos, io_parent, board); 393 } 394 395 if (flags & HPEE_FUNCTION_INFO_HAVE_PORT_INIT) { 396 pos += configure_port_init(buf+pos); 397 } 398 399 if (p0 + function_len < pos) { 400 printk("\n" KERN_ERR "eisa_enumerator: function %d length mis-match " 401 "got %d, expected %d\n", 402 num_func, pos-p0, function_len); 403 res=-1; 404 break; 405 } 406 pos = p0 + function_len; 407 } 408 printk("\n"); 409 if (!id_string_used) { 410 kfree(board); 411 } 412 413 if (pos != es->config_data_length) { 414 printk(KERN_ERR "eisa_enumerator: config data length mis-match got %d, expected %d\n", 415 pos, es->config_data_length); 416 res=-1; 417 } 418 419 if (num_func != es->num_functions) { 420 printk(KERN_ERR "eisa_enumerator: number of functions mis-match got %d, expected %d\n", 421 num_func, es->num_functions); 422 res=-2; 423 } 424 425 return res; 426 427} 428 429static int init_slot(int slot, struct eeprom_eisa_slot_info *es) 430{ 431 unsigned int id; 432 433 char id_string[8]; 434 435 if (!(es->slot_info&HPEE_SLOT_INFO_NO_READID)) { 436 /* try to read the id of the board in the slot */ 437 id = le32_to_cpu(inl(SLOT2PORT(slot)+EPI)); 438 439 if (0xffffffff == id) { 440 /* Maybe we didn't expect a card to be here... */ 441 if (es->eisa_slot_id == 0xffffffff) 442 return -1; 443 444 /* this board is not here or it does not 445 * support readid 446 */ 447 printk(KERN_ERR "EISA slot %d a configured board was not detected (", 448 slot); 449 450 print_eisa_id(id_string, es->eisa_slot_id); 451 printk(" expected %s)\n", id_string); 452 453 return -1; 454 455 } 456 if (es->eisa_slot_id != id) { 457 print_eisa_id(id_string, id); 458 printk(KERN_ERR "EISA slot %d id mis-match: got %s", 459 slot, id_string); 460 461 print_eisa_id(id_string, es->eisa_slot_id); 462 printk(" expected %s \n", id_string); 463 464 return -1; 465 466 } 467 } 468 469 /* now: we need to enable the board if 470 * it supports enabling and run through 471 * the port init sction if present 472 * and finally record any interrupt polarity 473 */ 474 if (es->slot_features & HPEE_SLOT_FEATURES_ENABLE) { 475 /* enable board */ 476 outb(0x01| inb(SLOT2PORT(slot)+EPI+4), 477 SLOT2PORT(slot)+EPI+4); 478 } 479 480 return 0; 481} 482 483 484int eisa_enumerator(unsigned long eeprom_addr, 485 struct resource *io_parent, struct resource *mem_parent) 486{ 487 int i; 488 struct eeprom_header *eh; 489 static char eeprom_buf[HPEE_MAX_LENGTH]; 490 491 for (i=0; i < HPEE_MAX_LENGTH; i++) { 492 eeprom_buf[i] = gsc_readb(eeprom_addr+i); 493 } 494 495 printk(KERN_INFO "Enumerating EISA bus\n"); 496 497 eh = (struct eeprom_header*)(eeprom_buf); 498 for (i=0;i<eh->num_slots;i++) { 499 struct eeprom_eisa_slot_info *es; 500 501 es = (struct eeprom_eisa_slot_info*) 502 (&eeprom_buf[HPEE_SLOT_INFO(i)]); 503 504 if (-1==init_slot(i+1, es)) { 505 continue; 506 } 507 508 if (es->config_data_offset < HPEE_MAX_LENGTH) { 509 if (parse_slot_config(i+1, &eeprom_buf[es->config_data_offset], 510 es, io_parent, mem_parent)) { 511 return -1; 512 } 513 } else { 514 printk (KERN_WARNING "EISA EEPROM offset 0x%x out of range\n",es->config_data_offset); 515 return -1; 516 } 517 } 518 return eh->num_slots; 519} 520