pci_cfgreg.c revision 16471
150276Speter/************************************************************************** 250276Speter** 350276Speter** $Id: pcibus.c,v 1.25 1996/06/13 21:50:41 se Exp $ 450276Speter** 550276Speter** pci bus subroutines for i386 architecture. 650276Speter** 750276Speter** FreeBSD 850276Speter** 950276Speter**------------------------------------------------------------------------- 1050276Speter** 1150276Speter** Copyright (c) 1994 Wolfgang Stanglmeier. All rights reserved. 1250276Speter** 1350276Speter** Redistribution and use in source and binary forms, with or without 1450276Speter** modification, are permitted provided that the following conditions 1550276Speter** are met: 1650276Speter** 1. Redistributions of source code must retain the above copyright 1750276Speter** notice, this list of conditions and the following disclaimer. 1850276Speter** 2. Redistributions in binary form must reproduce the above copyright 1950276Speter** notice, this list of conditions and the following disclaimer in the 2050276Speter** documentation and/or other materials provided with the distribution. 2150276Speter** 3. The name of the author may not be used to endorse or promote products 2250276Speter** derived from this software without specific prior written permission. 2350276Speter** 2450276Speter** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 2550276Speter** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 2650276Speter** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2750276Speter** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2850276Speter** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2950276Speter** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 3050276Speter** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 3150276Speter** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3250276Speter** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 3350276Speter** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 3450276Speter** 3550276Speter*************************************************************************** 3650276Speter*/ 3750276Speter 3850276Speter#include "vector.h" 3950276Speter 4050276Speter#include <sys/param.h> 4150276Speter#include <sys/systm.h> 4250276Speter#include <sys/kernel.h> 4350276Speter 4450276Speter#include <i386/isa/icu.h> 4550276Speter#include <i386/isa/isa_device.h> 4650276Speter 4750276Speter#include <pci/pcivar.h> 4850276Speter#include <pci/pcireg.h> 4950276Speter#include <pci/pcibus.h> 5050276Speter 5150276Speter/*----------------------------------------------------------------- 5250276Speter** 5350276Speter** The following functions are provided by the pci bios. 5450276Speter** They are used only by the pci configuration. 5550276Speter** 5650276Speter** pcibus_setup(): 5750276Speter** Probes for a pci system. 5850276Speter** Sets pci_maxdevice and pci_mechanism. 5950276Speter** 6050276Speter** pcibus_tag(): 6150276Speter** Creates a handle for pci configuration space access. 6250276Speter** This handle is given to the read/write functions. 6350276Speter** 6450276Speter** pcibus_ftag(): 6550276Speter** Creates a modified handle. 6650276Speter** 6750276Speter** pcibus_read(): 6850276Speter** Read a long word from the pci configuration space. 6950276Speter** Requires a tag (from pcitag) and the register 7050276Speter** number (should be a long word alligned one). 7150276Speter** 7250276Speter** pcibus_write(): 7350276Speter** Writes a long word to the pci configuration space. 7450276Speter** Requires a tag (from pcitag), the register number 7550276Speter** (should be a long word alligned one), and a value. 7650276Speter** 7750276Speter** pcibus_regirq(): 7850276Speter** Register an interupt handler for a pci device. 7950276Speter** Requires a tag (from pcitag), the register number 8050276Speter** (should be a long word alligned one), and a value. 8150276Speter** 82**----------------------------------------------------------------- 83*/ 84 85static int 86pcibus_check (void); 87 88static void 89pcibus_setup (void); 90 91static pcici_t 92pcibus_tag (u_char bus, u_char device, u_char func); 93 94static pcici_t 95pcibus_ftag (pcici_t tag, u_char func); 96 97static u_long 98pcibus_read (pcici_t tag, u_long reg); 99 100static void 101pcibus_write (pcici_t tag, u_long reg, u_long data); 102 103static int 104pcibus_ihandler_attach (int irq, inthand2_t *func, int arg, unsigned* maskptr); 105 106static int 107pcibus_ihandler_detach (int irq, inthand2_t *func); 108 109static int 110pcibus_imask_include (int irq, unsigned* maskptr); 111 112static int 113pcibus_imask_exclude (int irq, unsigned* maskptr); 114 115static struct pcibus i386pci = { 116 "pci", 117 pcibus_setup, 118 pcibus_tag, 119 pcibus_ftag, 120 pcibus_read, 121 pcibus_write, 122 ICU_LEN, 123 pcibus_ihandler_attach, 124 pcibus_ihandler_detach, 125 pcibus_imask_include, 126 pcibus_imask_exclude, 127}; 128 129/* 130** Announce structure to generic driver 131*/ 132 133DATA_SET (pcibus_set, i386pci); 134 135/*-------------------------------------------------------------------- 136** 137** Determine configuration mode 138** 139**-------------------------------------------------------------------- 140*/ 141 142 143#define CONF1_ADDR_PORT 0x0cf8 144#define CONF1_DATA_PORT 0x0cfc 145 146#define CONF1_ENABLE 0x80000000ul 147#define CONF1_ENABLE_CHK 0x80000000ul 148#define CONF1_ENABLE_MSK 0x7ff00000ul 149#define CONF1_ENABLE_CHK1 0xff000001ul 150#define CONF1_ENABLE_MSK1 0x80000001ul 151#define CONF1_ENABLE_RES1 0x80000000ul 152 153#define CONF2_ENABLE_PORT 0x0cf8 154#define CONF2_FORWARD_PORT 0x0cfa 155 156#define CONF2_ENABLE_CHK 0x0e 157#define CONF2_ENABLE_RES 0x0e 158 159static int 160pcibus_check (void) 161{ 162 u_char device; 163 164 if (bootverbose) printf ("pcibus_check:\tdevice "); 165 166 for (device = 0; device < pci_maxdevice; device++) { 167 unsigned long id; 168 if (bootverbose) 169 printf ("%d ", device); 170 id = pcibus_read (pcibus_tag (0,device,0), 0); 171 if (id && id != 0xfffffffful) { 172 if (bootverbose) printf ("is there (id=%08lx)\n", id); 173 return 1; 174 } 175 } 176 if (bootverbose) 177 printf ("-- nothing found\n"); 178 return 0; 179} 180 181static void 182pcibus_setup (void) 183{ 184 unsigned long mode1res,oldval1; 185 unsigned char mode2res,oldval2; 186 187 oldval1 = inl (CONF1_ADDR_PORT); 188 189 if (bootverbose) { 190 printf ("pcibus_setup(1):\tmode 1 addr port (0x0cf8) is 0x%08lx\n", oldval1); 191 } 192 193 /*--------------------------------------- 194 ** Assume configuration mechanism 1 for now ... 195 **--------------------------------------- 196 */ 197 198 if ((oldval1 & CONF1_ENABLE_MSK) == 0) { 199 200 pci_mechanism = 1; 201 pci_maxdevice = 32; 202 203 outl (CONF1_ADDR_PORT, CONF1_ENABLE_CHK); 204 outb (CONF1_ADDR_PORT +3, 0); 205 mode1res = inl (CONF1_ADDR_PORT); 206 outl (CONF1_ADDR_PORT, oldval1); 207 208 if (bootverbose) 209 printf ("pcibus_setup(1a):\tmode1res=0x%08lx (0x%08lx)\n", 210 mode1res, CONF1_ENABLE_CHK); 211 212 if (mode1res) { 213 if (pcibus_check()) 214 return; 215 }; 216 217 outl (CONF1_ADDR_PORT, CONF1_ENABLE_CHK1); 218 mode1res = inl(CONF1_ADDR_PORT); 219 outl (CONF1_ADDR_PORT, oldval1); 220 221 if (bootverbose) 222 printf ("pcibus_setup(1b):\tmode1res=0x%08lx (0x%08lx)\n", 223 mode1res, CONF1_ENABLE_CHK1); 224 225 if ((mode1res & CONF1_ENABLE_MSK1) == CONF1_ENABLE_RES1) { 226 if (pcibus_check()) 227 return; 228 }; 229 } 230 231 /*--------------------------------------- 232 ** Try configuration mechanism 2 ... 233 **--------------------------------------- 234 */ 235 236 oldval2 = inb (CONF2_ENABLE_PORT); 237 238 if (bootverbose) { 239 printf ("pcibus_setup(2):\tmode 2 enable port (0x0cf8) is 0x%02x\n", oldval2); 240 } 241 242 if ((oldval2 & 0xf0) == 0) { 243 244 pci_mechanism = 2; 245 pci_maxdevice = 16; 246 247 outb (CONF2_ENABLE_PORT, CONF2_ENABLE_CHK); 248 mode2res = inb(CONF2_ENABLE_PORT); 249 outb (CONF2_ENABLE_PORT, oldval2); 250 251 if (bootverbose) 252 printf ("pcibus_setup(2a):\tmode2res=0x%02x (0x%02x)\n", 253 mode2res, CONF2_ENABLE_CHK); 254 255 if (mode2res == CONF2_ENABLE_RES) { 256 if (bootverbose) 257 printf ("pcibus_setup(2a):\tnow trying mechanism 2\n"); 258 259 if (pcibus_check()) 260 return; 261 } 262 } 263 264 /*--------------------------------------- 265 ** No PCI bus host bridge found 266 **--------------------------------------- 267 */ 268 269 pci_mechanism = 0; 270 pci_maxdevice = 0; 271} 272 273/*-------------------------------------------------------------------- 274** 275** Build a pcitag from bus, device and function number 276** 277**-------------------------------------------------------------------- 278*/ 279 280static pcici_t 281pcibus_tag (unsigned char bus, unsigned char device, unsigned char func) 282{ 283 pcici_t tag; 284 285 tag.cfg1 = 0; 286 if (func >= 8) return tag; 287 288 switch (pci_mechanism) { 289 290 case 1: 291 if (device < 32) { 292 tag.cfg1 = CONF1_ENABLE 293 | (((u_long) bus ) << 16ul) 294 | (((u_long) device) << 11ul) 295 | (((u_long) func ) << 8ul); 296 } 297 break; 298 case 2: 299 if (device < 16) { 300 tag.cfg2.port = 0xc000 | (device << 8ul); 301 tag.cfg2.enable = 0xf0 | (func << 1ul); 302 tag.cfg2.forward = bus; 303 } 304 break; 305 }; 306 return tag; 307} 308 309static pcici_t 310pcibus_ftag (pcici_t tag, u_char func) 311{ 312 switch (pci_mechanism) { 313 314 case 1: 315 tag.cfg1 &= ~0x700ul; 316 tag.cfg1 |= (((u_long) func) << 8ul); 317 break; 318 case 2: 319 tag.cfg2.enable = 0xf0 | (func << 1ul); 320 break; 321 }; 322 return tag; 323} 324 325/*-------------------------------------------------------------------- 326** 327** Read register from configuration space. 328** 329**-------------------------------------------------------------------- 330*/ 331 332static u_long 333pcibus_read (pcici_t tag, u_long reg) 334{ 335 u_long addr, data = 0; 336 337 if (!tag.cfg1) return (0xfffffffful); 338 339 switch (pci_mechanism) { 340 341 case 1: 342 addr = tag.cfg1 | (reg & 0xfc); 343#ifdef PCI_DEBUG 344 printf ("pci_conf_read(1): addr=%x ", addr); 345#endif 346 outl (CONF1_ADDR_PORT, addr); 347 data = inl (CONF1_DATA_PORT); 348 outl (CONF1_ADDR_PORT, 0 ); 349 break; 350 351 case 2: 352 addr = tag.cfg2.port | (reg & 0xfc); 353#ifdef PCI_DEBUG 354 printf ("pci_conf_read(2): addr=%x ", addr); 355#endif 356 outb (CONF2_ENABLE_PORT , tag.cfg2.enable ); 357 outb (CONF2_FORWARD_PORT, tag.cfg2.forward); 358 359 data = inl ((u_short) addr); 360 361 outb (CONF2_ENABLE_PORT, 0); 362 outb (CONF2_FORWARD_PORT, 0); 363 break; 364 }; 365 366#ifdef PCI_DEBUG 367 printf ("data=%x\n", data); 368#endif 369 370 return (data); 371} 372 373/*-------------------------------------------------------------------- 374** 375** Write register into configuration space. 376** 377**-------------------------------------------------------------------- 378*/ 379 380static void 381pcibus_write (pcici_t tag, u_long reg, u_long data) 382{ 383 u_long addr; 384 385 if (!tag.cfg1) return; 386 387 switch (pci_mechanism) { 388 389 case 1: 390 addr = tag.cfg1 | (reg & 0xfc); 391#ifdef PCI_DEBUG 392 printf ("pci_conf_write(1): addr=%x data=%x\n", 393 addr, data); 394#endif 395 outl (CONF1_ADDR_PORT, addr); 396 outl (CONF1_DATA_PORT, data); 397 outl (CONF1_ADDR_PORT, 0 ); 398 break; 399 400 case 2: 401 addr = tag.cfg2.port | (reg & 0xfc); 402#ifdef PCI_DEBUG 403 printf ("pci_conf_write(2): addr=%x data=%x\n", 404 addr, data); 405#endif 406 outb (CONF2_ENABLE_PORT, tag.cfg2.enable); 407 outb (CONF2_FORWARD_PORT, tag.cfg2.forward); 408 409 outl ((u_short) addr, data); 410 411 outb (CONF2_ENABLE_PORT, 0); 412 outb (CONF2_FORWARD_PORT, 0); 413 break; 414 }; 415} 416 417/*----------------------------------------------------------------------- 418** 419** Register an interupt handler for a pci device. 420** 421**----------------------------------------------------------------------- 422*/ 423 424static int 425pcibus_ihandler_attach (int irq, inthand2_t *func, int arg, unsigned * maskptr) 426{ 427 char buf[16]; 428 char *cp; 429 int free_id, id, result; 430 431 sprintf(buf, "pci irq%d", irq); 432 for (cp = intrnames, free_id = 0, id = 0; id < NR_DEVICES; id++) { 433 if (strcmp(cp, buf) == 0) 434 break; 435 if (free_id <= 0 && strcmp(cp, "pci irqnn") == 0) 436 free_id = id; 437 while (*cp++ != '\0') 438 ; 439 } 440 if (id == NR_DEVICES) { 441 id = free_id; 442 if (id == 0) { 443 /* 444 * All pci irq counters are in use, perhaps because 445 * config is old so there aren't any. Abuse the 446 * clk0 counter. 447 */ 448 printf ( 449 "pcibus_ihandler_attach: counting pci irq%d's as clk0 irqs\n", 450 irq); 451 } 452 } 453 result = register_intr( 454 irq, /* isa irq */ 455 id, /* device id */ 456 0, /* flags? */ 457 func, /* handler */ 458 maskptr, /* mask pointer */ 459 arg); /* handler arg */ 460 461 if (result) { 462 printf ("@@@ pcibus_ihandler_attach: result=%d\n", result); 463 return (result); 464 }; 465 update_intr_masks(); 466 467 INTREN ((1ul<<irq)); 468 return (0); 469} 470 471static int 472pcibus_ihandler_detach (int irq, inthand2_t *func) 473{ 474 int result; 475 476 INTRDIS ((1ul<<irq)); 477 478 result = unregister_intr (irq, func); 479 480 if (result) 481 printf ("@@@ pcibus_ihandler_detach: result=%d\n", result); 482 483 update_intr_masks(); 484 485 return (result); 486} 487 488static int 489pcibus_imask_include (int irq, unsigned* maskptr) 490{ 491 unsigned mask; 492 493 if (!maskptr) return (0); 494 495 mask = 1ul << irq; 496 497 if (*maskptr & mask) 498 return (-1); 499 500 INTRMASK (*maskptr, mask); 501 update_intr_masks(); 502 503 return (0); 504} 505 506static int 507pcibus_imask_exclude (int irq, unsigned* maskptr) 508{ 509 unsigned mask; 510 511 if (!maskptr) return (0); 512 513 mask = 1ul << irq; 514 515 if (! (*maskptr & mask)) 516 return (-1); 517 518 *maskptr &= ~mask; 519 update_intr_masks(); 520 521 return (0); 522} 523