arch/ppc/platforms/prep_setup.c

   1 /*
   2  *  Copyright (C) 1995  Linus Torvalds
   3  *  Adapted from 'alpha' version by Gary Thomas
   4  *  Modified by Cort Dougan (cort@cs.nmt.edu)
   5  *
   6  * Support for PReP (Motorola MTX/MVME)
   7  * by Troy Benjegerdes (hozer@drgw.net)
   8  */
   9
  10 /*
  11  * bootup setup stuff..
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/module.h>
  16 #include <linux/errno.h>
  17 #include <linux/sched.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mm.h>
  20 #include <linux/stddef.h>
  21 #include <linux/unistd.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/slab.h>
  24 #include <linux/user.h>
  25 #include <linux/a.out.h>
  26 #include <linux/screen_info.h>
  27 #include <linux/major.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/reboot.h>
  30 #include <linux/init.h>
  31 #include <linux/initrd.h>
  32 #include <linux/ioport.h>
  33 #include <linux/console.h>
  34 #include <linux/timex.h>
  35 #include <linux/pci.h>
  36 #include <linux/ide.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/root_dev.h>
  39
  40 #include <asm/sections.h>
  41 #include <asm/mmu.h>
  42 #include <asm/processor.h>
  43 #include <asm/residual.h>
  44 #include <asm/io.h>
  45 #include <asm/pgtable.h>
  46 #include <asm/cache.h>
  47 #include <asm/dma.h>
  48 #include <asm/machdep.h>
  49 #include <asm/mc146818rtc.h>
  50 #include <asm/mk48t59.h>
  51 #include <asm/prep_nvram.h>
  52 #include <asm/raven.h>
  53 #include <asm/vga.h>
  54 #include <asm/time.h>
  55 #include <asm/mpc10x.h>
  56 #include <asm/i8259.h>
  57 #include <asm/open_pic.h>
  58 #include <asm/pci-bridge.h>
  59 #include <asm/todc.h>
  60
  61 /* prep registers for L2 */
  62 #define CACHECRBA       0x80000823      /* Cache configuration register address */
  63 #define L2CACHE_MASK    0x03    /* Mask for 2 L2 Cache bits */
  64 #define L2CACHE_512KB   0x00    /* 512KB */
  65 #define L2CACHE_256KB   0x01    /* 256KB */
  66 #define L2CACHE_1MB     0x02    /* 1MB */
  67 #define L2CACHE_NONE    0x03    /* NONE */
  68 #define L2CACHE_PARITY  0x08    /* Mask for L2 Cache Parity Protected bit */
  69
  70 TODC_ALLOC();
  71
  72 unsigned char ucBoardRev;
  73 unsigned char ucBoardRevMaj, ucBoardRevMin;
  74
  75 extern unsigned char prep_nvram_read_val(int addr);
  76 extern void prep_nvram_write_val(int addr,
  77                                  unsigned char val);
  78 extern unsigned char rs_nvram_read_val(int addr);
  79 extern void rs_nvram_write_val(int addr,
  80                                  unsigned char val);
  81 extern void ibm_prep_init(void);
  82
  83 extern void prep_find_bridges(void);
  84
  85 int _prep_type;
  86
  87 extern void prep_residual_setup_pci(char *irq_edge_mask_lo, char *irq_edge_mask_hi);
  88 extern void prep_sandalfoot_setup_pci(char *irq_edge_mask_lo, char *irq_edge_mask_hi);
  89 extern void prep_thinkpad_setup_pci(char *irq_edge_mask_lo, char *irq_edge_mask_hi);
  90 extern void prep_carolina_setup_pci(char *irq_edge_mask_lo, char *irq_edge_mask_hi);
  91 extern void prep_tiger1_setup_pci(char *irq_edge_mask_lo, char *irq_edge_mask_hi);
  92
  93
  94 #define cached_21       (((char *)(ppc_cached_irq_mask))[3])
  95 #define cached_A1       (((char *)(ppc_cached_irq_mask))[2])
  96
  97 #ifdef CONFIG_SOUND_CS4232
  98 long ppc_cs4232_dma, ppc_cs4232_dma2;
  99 #endif
 100
 101 extern PTE *Hash, *Hash_end;
 102 extern unsigned long Hash_size, Hash_mask;
 103 extern int probingmem;
 104 extern unsigned long loops_per_jiffy;
 105
 106 #ifdef CONFIG_SOUND_CS4232
 107 EXPORT_SYMBOL(ppc_cs4232_dma);
 108 EXPORT_SYMBOL(ppc_cs4232_dma2);
 109 #endif
 110
 111 /* useful ISA ports */
 112 #define PREP_SYSCTL     0x81c
 113 /* present in the IBM reference design; possibly identical in Mot boxes: */
 114 #define PREP_IBM_SIMM_ID        0x803   /* SIMM size: 32 or 8 MiB */
 115 #define PREP_IBM_SIMM_PRESENCE  0x804
 116 #define PREP_IBM_EQUIPMENT      0x80c
 117 #define PREP_IBM_L2INFO 0x80d
 118 #define PREP_IBM_PM1    0x82a   /* power management register 1 */
 119 #define PREP_IBM_PLANAR 0x852   /* planar ID - identifies the motherboard */
 120 #define PREP_IBM_DISP   0x8c0   /* 4-digit LED display */
 121
 122 /* Equipment Present Register masks: */
 123 #define PREP_IBM_EQUIPMENT_RESERVED     0x80
 124 #define PREP_IBM_EQUIPMENT_SCSIFUSE     0x40
 125 #define PREP_IBM_EQUIPMENT_L2_COPYBACK  0x08
 126 #define PREP_IBM_EQUIPMENT_L2_256       0x04
 127 #define PREP_IBM_EQUIPMENT_CPU  0x02
 128 #define PREP_IBM_EQUIPMENT_L2   0x01
 129
 130 /* planar ID values: */
 131 /* Sandalfoot/Sandalbow (6015/7020) */
 132 #define PREP_IBM_SANDALFOOT     0xfc
 133 /* Woodfield, Thinkpad 850/860 (6042/7249) */
 134 #define PREP_IBM_THINKPAD       0xff /* planar ID unimplemented */
 135 /* PowerSeries 830/850 (6050/6070) */
 136 #define PREP_IBM_CAROLINA_IDE_0 0xf0
 137 #define PREP_IBM_CAROLINA_IDE_1 0xf1
 138 #define PREP_IBM_CAROLINA_IDE_2 0xf2
 139 #define PREP_IBM_CAROLINA_IDE_3 0xf3
 140 /* 7248-43P */
 141 #define PREP_IBM_CAROLINA_SCSI_0        0xf4
 142 #define PREP_IBM_CAROLINA_SCSI_1        0xf5
 143 #define PREP_IBM_CAROLINA_SCSI_2        0xf6
 144 #define PREP_IBM_CAROLINA_SCSI_3        0xf7 /* missing from Carolina Tech Spec */
 145 /* Tiger1 (7043-140) */
 146 #define PREP_IBM_TIGER1_133             0xd1
 147 #define PREP_IBM_TIGER1_166             0xd2
 148 #define PREP_IBM_TIGER1_180             0xd3
 149 #define PREP_IBM_TIGER1_xxx             0xd4 /* unknown, but probably exists */
 150 #define PREP_IBM_TIGER1_333             0xd5 /* missing from Tiger Tech Spec */
 151
 152 /* setup_ibm_pci:
 153  *      set Motherboard_map_name, Motherboard_map, Motherboard_routes.
 154  *      return 8259 edge/level masks.
 155  */
 156 void (*setup_ibm_pci)(char *irq_lo, char *irq_hi);
 157
 158 extern char *Motherboard_map_name; /* for use in *_cpuinfo */
 159
 160 /*
 161  * As found in the PReP reference implementation.
 162  * Used by Thinkpad, Sandalfoot (6015/7020), and all Motorola PReP.
 163  */
 164 static void __init
 165 prep_gen_enable_l2(void)
 166 {
 167         outb(inb(PREP_SYSCTL) | 0x3, PREP_SYSCTL);
 168 }
 169
 170 /* Used by Carolina and Tiger1 */
 171 static void __init
 172 prep_carolina_enable_l2(void)
 173 {
 174         outb(inb(PREP_SYSCTL) | 0xc0, PREP_SYSCTL);
 175 }
 176
 177 /* cpuinfo code common to all IBM PReP */
 178 static void
 179 prep_ibm_cpuinfo(struct seq_file *m)
 180 {
 181         unsigned int equip_reg = inb(PREP_IBM_EQUIPMENT);
 182
 183         seq_printf(m, "machine\t\t: PReP %s\n", Motherboard_map_name);
 184
 185         seq_printf(m, "upgrade cpu\t: ");
 186         if (equip_reg & PREP_IBM_EQUIPMENT_CPU) {
 187                 seq_printf(m, "not ");
 188         }
 189         seq_printf(m, "present\n");
 190
 191         /* print info about the SCSI fuse */
 192         seq_printf(m, "scsi fuse\t: ");
 193         if (equip_reg & PREP_IBM_EQUIPMENT_SCSIFUSE)
 194                 seq_printf(m, "ok");
 195         else
 196                 seq_printf(m, "bad");
 197         seq_printf(m, "\n");
 198
 199         /* print info about SIMMs */
 200         if (have_residual_data) {
 201                 int i;
 202                 seq_printf(m, "simms\t\t: ");
 203                 for (i = 0; (res->ActualNumMemories) && (i < MAX_MEMS); i++) {
 204                         if (res->Memories[i].SIMMSize != 0)
 205                                 seq_printf(m, "%d:%ldMiB ", i,
 206                                         (res->Memories[i].SIMMSize > 1024) ?
 207                                         res->Memories[i].SIMMSize>>20 :
 208                                         res->Memories[i].SIMMSize);
 209                 }
 210                 seq_printf(m, "\n");
 211         }
 212 }
 213
 214 static int
 215 prep_gen_cpuinfo(struct seq_file *m)
 216 {
 217         prep_ibm_cpuinfo(m);
 218         return 0;
 219 }
 220
 221 static int
 222 prep_sandalfoot_cpuinfo(struct seq_file *m)
 223 {
 224         unsigned int equip_reg = inb(PREP_IBM_EQUIPMENT);
 225
 226         prep_ibm_cpuinfo(m);
 227
 228         /* report amount and type of L2 cache present */
 229         seq_printf(m, "L2 cache\t: ");
 230         if (equip_reg & PREP_IBM_EQUIPMENT_L2) {
 231                 seq_printf(m, "not present");
 232         } else {
 233                 if (equip_reg & PREP_IBM_EQUIPMENT_L2_256)
 234                         seq_printf(m, "256KiB");
 235                 else
 236                         seq_printf(m, "unknown size");
 237
 238                 if (equip_reg & PREP_IBM_EQUIPMENT_L2_COPYBACK)
 239                         seq_printf(m, ", copy-back");
 240                 else
 241                         seq_printf(m, ", write-through");
 242         }
 243         seq_printf(m, "\n");
 244
 245         return 0;
 246 }
 247
 248 static int
 249 prep_thinkpad_cpuinfo(struct seq_file *m)
 250 {
 251         unsigned int equip_reg = inb(PREP_IBM_EQUIPMENT);
 252         char *cpubus_speed, *pci_speed;
 253
 254         prep_ibm_cpuinfo(m);
 255
 256         /* report amount and type of L2 cache present */
 257         seq_printf(m, "l2 cache\t: ");
 258         if ((equip_reg & 0x1) == 0) {
 259                 switch ((equip_reg & 0xc) >> 2) {
 260                         case 0x0:
 261                                 seq_printf(m, "128KiB look-aside 2-way write-through\n");
 262                                 break;
 263                         case 0x1:
 264                                 seq_printf(m, "512KiB look-aside direct-mapped write-back\n");
 265                                 break;
 266                         case 0x2:
 267                                 seq_printf(m, "256KiB look-aside 2-way write-through\n");
 268                                 break;
 269                         case 0x3:
 270                                 seq_printf(m, "256KiB look-aside direct-mapped write-back\n");
 271                                 break;
 272                 }
 273         } else {
 274                 seq_printf(m, "not present\n");
 275         }
 276
 277         /* report bus speeds because we can */
 278         if ((equip_reg & 0x80) == 0) {
 279                 switch ((equip_reg & 0x30) >> 4) {
 280                         case 0x1:
 281                                 cpubus_speed = "50";
 282                                 pci_speed = "25";
 283                                 break;
 284                         case 0x3:
 285                                 cpubus_speed = "66";
 286                                 pci_speed = "33";
 287                                 break;
 288                         default:
 289                                 cpubus_speed = "unknown";
 290                                 pci_speed = "unknown";
 291                                 break;
 292                 }
 293         } else {
 294                 switch ((equip_reg & 0x30) >> 4) {
 295                         case 0x1:
 296                                 cpubus_speed = "25";
 297                                 pci_speed = "25";
 298                                 break;
 299                         case 0x2:
 300                                 cpubus_speed = "60";
 301                                 pci_speed = "30";
 302                                 break;
 303                         case 0x3:
 304                                 cpubus_speed = "33";
 305                                 pci_speed = "33";
 306                                 break;
 307                         default:
 308                                 cpubus_speed = "unknown";
 309                                 pci_speed = "unknown";
 310                                 break;
 311                 }
 312         }
 313         seq_printf(m, "60x bus\t\t: %sMHz\n", cpubus_speed);
 314         seq_printf(m, "pci bus\t\t: %sMHz\n", pci_speed);
 315
 316         return 0;
 317 }
 318
 319 static int
 320 prep_carolina_cpuinfo(struct seq_file *m)
 321 {
 322         unsigned int equip_reg = inb(PREP_IBM_EQUIPMENT);
 323
 324         prep_ibm_cpuinfo(m);
 325
 326         /* report amount and type of L2 cache present */
 327         seq_printf(m, "l2 cache\t: ");
 328         if ((equip_reg & 0x1) == 0) {
 329                 unsigned int l2_reg = inb(PREP_IBM_L2INFO);
 330
 331                 /* L2 size */
 332                 if ((l2_reg & 0x60) == 0)
 333                         seq_printf(m, "256KiB");
 334                 else if ((l2_reg & 0x60) == 0x20)
 335                         seq_printf(m, "512KiB");
 336                 else
 337                         seq_printf(m, "unknown size");
 338
 339                 /* L2 type */
 340                 if ((l2_reg & 0x3) == 0)
 341                         seq_printf(m, ", async");
 342                 else if ((l2_reg & 0x3) == 1)
 343                         seq_printf(m, ", sync");
 344                 else
 345                         seq_printf(m, ", unknown type");
 346
 347                 seq_printf(m, "\n");
 348         } else {
 349                 seq_printf(m, "not present\n");
 350         }
 351
 352         return 0;
 353 }
 354
 355 static int
 356 prep_tiger1_cpuinfo(struct seq_file *m)
 357 {
 358         unsigned int l2_reg = inb(PREP_IBM_L2INFO);
 359
 360         prep_ibm_cpuinfo(m);
 361
 362         /* report amount and type of L2 cache present */
 363         seq_printf(m, "l2 cache\t: ");
 364         if ((l2_reg & 0xf) == 0xf) {
 365                 seq_printf(m, "not present\n");
 366         } else {
 367                 if (l2_reg & 0x8)
 368                         seq_printf(m, "async, ");
 369                 else
 370                         seq_printf(m, "sync burst, ");
 371
 372                 if (l2_reg & 0x4)
 373                         seq_printf(m, "parity, ");
 374                 else
 375                         seq_printf(m, "no parity, ");
 376
 377                 switch (l2_reg & 0x3) {
 378                         case 0x0:
 379                                 seq_printf(m, "256KiB\n");
 380                                 break;
 381                         case 0x1:
 382                                 seq_printf(m, "512KiB\n");
 383                                 break;
 384                         case 0x2:
 385                                 seq_printf(m, "1MiB\n");
 386                                 break;
 387                         default:
 388                                 seq_printf(m, "unknown size\n");
 389                                 break;
 390                 }
 391         }
 392
 393         return 0;
 394 }
 395
 396
 397 /* Used by all Motorola PReP */
 398 static int
 399 prep_mot_cpuinfo(struct seq_file *m)
 400 {
 401         unsigned int cachew = *((unsigned char *)CACHECRBA);
 402
 403         seq_printf(m, "machine\t\t: PReP %s\n", Motherboard_map_name);
 404
 405         /* report amount and type of L2 cache present */
 406         seq_printf(m, "l2 cache\t: ");
 407         switch (cachew & L2CACHE_MASK) {
 408                 case L2CACHE_512KB:
 409                         seq_printf(m, "512KiB");
 410                         break;
 411                 case L2CACHE_256KB:
 412                         seq_printf(m, "256KiB");
 413                         break;
 414                 case L2CACHE_1MB:
 415                         seq_printf(m, "1MiB");
 416                         break;
 417                 case L2CACHE_NONE:
 418                         seq_printf(m, "none\n");
 419                         goto no_l2;
 420                         break;
 421                 default:
 422                         seq_printf(m, "%x\n", cachew);
 423         }
 424
 425         seq_printf(m, ", parity %s",
 426                         (cachew & L2CACHE_PARITY)? "enabled" : "disabled");
 427
 428         seq_printf(m, " SRAM:");
 429
 430         switch ( ((cachew & 0xf0) >> 4) & ~(0x3) ) {
 431                 case 1: seq_printf(m, "synchronous, parity, flow-through\n");
 432                                 break;
 433                 case 2: seq_printf(m, "asynchronous, no parity\n");
 434                                 break;
 435                 case 3: seq_printf(m, "asynchronous, parity\n");
 436                                 break;
 437                 default:seq_printf(m, "synchronous, pipelined, no parity\n");
 438                                 break;
 439         }
 440
 441 no_l2:
 442         /* print info about SIMMs */
 443         if (have_residual_data) {
 444                 int i;
 445                 seq_printf(m, "simms\t\t: ");
 446                 for (i = 0; (res->ActualNumMemories) && (i < MAX_MEMS); i++) {
 447                         if (res->Memories[i].SIMMSize != 0)
 448                                 seq_printf(m, "%d:%ldM ", i,
 449                                         (res->Memories[i].SIMMSize > 1024) ?
 450                                         res->Memories[i].SIMMSize>>20 :
 451                                         res->Memories[i].SIMMSize);
 452                 }
 453                 seq_printf(m, "\n");
 454         }
 455
 456         return 0;
 457 }
 458
 459 static void
 460 prep_restart(char *cmd)
 461 {
 462 #define PREP_SP92       0x92    /* Special Port 92 */
 463         local_irq_disable(); /* no interrupts */
 464
 465         /* set exception prefix high - to the prom */
 466         _nmask_and_or_msr(0, MSR_IP);
 467
 468         /* make sure bit 0 (reset) is a 0 */
 469         outb( inb(PREP_SP92) & ~1L , PREP_SP92);
 470         /* signal a reset to system control port A - soft reset */
 471         outb( inb(PREP_SP92) | 1 , PREP_SP92);
 472
 473         while ( 1 ) ;
 474         /* not reached */
 475 #undef PREP_SP92
 476 }
 477
 478 static void
 479 prep_halt(void)
 480 {
 481         local_irq_disable(); /* no interrupts */
 482
 483         /* set exception prefix high - to the prom */
 484         _nmask_and_or_msr(0, MSR_IP);
 485
 486         while ( 1 ) ;
 487         /* not reached */
 488 }
 489
 490 /* Carrera is the power manager in the Thinkpads. Unfortunately not much is
 491  * known about it, so we can't power down.
 492  */
 493 static void
 494 prep_carrera_poweroff(void)
 495 {
 496         prep_halt();
 497 }
 498
 499 /*
 500  * On most IBM PReP's, power management is handled by a Signetics 87c750
 501  * behind the Utah component on the ISA bus. To access the 750 you must write
 502  * a series of nibbles to port 0x82a (decoded by the Utah). This is described
 503  * somewhat in the IBM Carolina Technical Specification.
 504  * -Hollis
 505  */
 506 static void
 507 utah_sig87c750_setbit(unsigned int bytenum, unsigned int bitnum, int value)
 508 {
 509         /*
 510          * byte1: 0 0 0 1 0  d  a5 a4
 511          * byte2: 0 0 0 1 a3 a2 a1 a0
 512          *
 513          * d = the bit's value, enabled or disabled
 514          * (a5 a4 a3) = the byte number, minus 20
 515          * (a2 a1 a0) = the bit number
 516          *
 517          * example: set the 5th bit of byte 21 (21.5)
 518          *     a5 a4 a3 = 001 (byte 1)
 519          *     a2 a1 a0 = 101 (bit 5)
 520          *
 521          *     byte1 = 0001 0100 (0x14)
 522          *     byte2 = 0001 1101 (0x1d)
 523          */
 524         unsigned char byte1=0x10, byte2=0x10;
 525
 526         /* the 750's '20.0' is accessed as '0.0' through Utah (which adds 20) */
 527         bytenum -= 20;
 528
 529         byte1 |= (!!value) << 2;                /* set d */
 530         byte1 |= (bytenum >> 1) & 0x3;  /* set a5, a4 */
 531
 532         byte2 |= (bytenum & 0x1) << 3;  /* set a3 */
 533         byte2 |= bitnum & 0x7;                  /* set a2, a1, a0 */
 534
 535         outb(byte1, PREP_IBM_PM1);      /* first nibble */
 536         mb();
 537         udelay(100);                            /* important: let controller recover */
 538
 539         outb(byte2, PREP_IBM_PM1);      /* second nibble */
 540         mb();
 541         udelay(100);                            /* important: let controller recover */
 542 }
 543
 544 static void
 545 prep_sig750_poweroff(void)
 546 {
 547         /* tweak the power manager found in most IBM PRePs (except Thinkpads) */
 548
 549         local_irq_disable();
 550         /* set exception prefix high - to the prom */
 551         _nmask_and_or_msr(0, MSR_IP);
 552
 553         utah_sig87c750_setbit(21, 5, 1); /* set bit 21.5, "PMEXEC_OFF" */
 554
 555         while (1) ;
 556         /* not reached */
 557 }
 558
 559 static int
 560 prep_show_percpuinfo(struct seq_file *m, int i)
 561 {
 562         /* PREP's without residual data will give incorrect values here */
 563         seq_printf(m, "clock\t\t: ");
 564         if (have_residual_data)
 565                 seq_printf(m, "%ldMHz\n",
 566                            (res->VitalProductData.ProcessorHz > 1024) ?
 567                            res->VitalProductData.ProcessorHz / 1000000 :
 568                            res->VitalProductData.ProcessorHz);
 569         else
 570                 seq_printf(m, "???\n");
 571
 572         return 0;
 573 }
 574
 575 #ifdef CONFIG_SOUND_CS4232
 576 static long __init masktoint(unsigned int i)
 577 {
 578         int t = -1;
 579         while (i >> ++t)
 580                 ;
 581         return (t-1);
 582 }
 583
 584 /*
 585  * ppc_cs4232_dma and ppc_cs4232_dma2 are used in include/asm/dma.h
 586  * to distinguish sound dma-channels from others. This is because
 587  * blocksize on 16 bit dma-channels 5,6,7 is 128k, but
 588  * the cs4232.c uses 64k like on 8 bit dma-channels 0,1,2,3
 589  */
 590
 591 static void __init prep_init_sound(void)
 592 {
 593         PPC_DEVICE *audiodevice = NULL;
 594
 595         /*
 596          * Get the needed resource informations from residual data.
 597          *
 598          */
 599         if (have_residual_data)
 600                 audiodevice = residual_find_device(~0, NULL,
 601                                 MultimediaController, AudioController, -1, 0);
 602
 603         if (audiodevice != NULL) {
 604                 PnP_TAG_PACKET *pkt;
 605
 606                 pkt = PnP_find_packet((unsigned char *)&res->DevicePnPHeap[audiodevice->AllocatedOffset],
 607                                 S5_Packet, 0);
 608                 if (pkt != NULL)
 609                         ppc_cs4232_dma = masktoint(pkt->S5_Pack.DMAMask);
 610                 pkt = PnP_find_packet((unsigned char*)&res->DevicePnPHeap[audiodevice->AllocatedOffset],
 611                                 S5_Packet, 1);
 612                 if (pkt != NULL)
 613                         ppc_cs4232_dma2 = masktoint(pkt->S5_Pack.DMAMask);
 614         }
 615
 616         /*
 617          * These are the PReP specs' defaults for the cs4231.  We use these
 618          * as fallback incase we don't have residual data.
 619          * At least the IBM Thinkpad 850 with IDE DMA Channels at 6 and 7
 620          * will use the other values.
 621          */
 622         if (audiodevice == NULL) {
 623                 switch (_prep_type) {
 624                 case _PREP_IBM:
 625                         ppc_cs4232_dma = 1;
 626                         ppc_cs4232_dma2 = -1;
 627                         break;
 628                 default:
 629                         ppc_cs4232_dma = 6;
 630                         ppc_cs4232_dma2 = 7;
 631                 }
 632         }
 633
 634         /*
 635          * Find a way to push these informations to the cs4232 driver
 636          * Give it out with printk, when not in cmd_line?
 637          * Append it to  cmd_line and boot_command_line?
 638          * Format is cs4232=io,irq,dma,dma2
 639          */
 640 }
 641 #endif /* CONFIG_SOUND_CS4232 */
 642
 643 /*
 644  * Fill out screen_info according to the residual data. This allows us to use
 645  * at least vesafb.
 646  */
 647 static void __init
 648 prep_init_vesa(void)
 649 {
 650 #if     (defined(CONFIG_FB_VGA16) || defined(CONFIG_FB_VGA16_MODULE) || \
 651          defined(CONFIG_FB_VESA))
 652         PPC_DEVICE *vgadev = NULL;
 653
 654         if (have_residual_data)
 655                 vgadev = residual_find_device(~0, NULL, DisplayController,
 656                                                         SVGAController, -1, 0);
 657
 658         if (vgadev != NULL) {
 659                 PnP_TAG_PACKET *pkt;
 660
 661                 pkt = PnP_find_large_vendor_packet(
 662                                 (unsigned char *)&res->DevicePnPHeap[vgadev->AllocatedOffset],
 663                                 0x04, 0); /* 0x04 = Display Tag */
 664                 if (pkt != NULL) {
 665                         unsigned char *ptr = (unsigned char *)pkt;
 666
 667                         if (ptr[4]) {
 668                                 /* graphics mode */
 669                                 screen_info.orig_video_isVGA = VIDEO_TYPE_VLFB;
 670
 671                                 screen_info.lfb_depth = ptr[4] * 8;
 672
 673                                 screen_info.lfb_width = swab16(*(short *)(ptr+6));
 674                                 screen_info.lfb_height = swab16(*(short *)(ptr+8));
 675                                 screen_info.lfb_linelength = swab16(*(short *)(ptr+10));
 676
 677                                 screen_info.lfb_base = swab32(*(long *)(ptr+12));
 678                                 screen_info.lfb_size = swab32(*(long *)(ptr+20)) / 65536;
 679                         }
 680                 }
 681         }
 682 #endif
 683 }
 684
 685 /*
 686  * Set DBAT 2 to access 0x80000000 so early progress messages will work
 687  */
 688 static __inline__ void
 689 prep_set_bat(void)
 690 {
 691         /* wait for all outstanding memory access to complete */
 692         mb();
 693
 694         /* setup DBATs */
 695         mtspr(SPRN_DBAT2U, 0x80001ffe);
 696         mtspr(SPRN_DBAT2L, 0x8000002a);
 697
 698         /* wait for updates */
 699         mb();
 700 }
 701
 702 /*
 703  * IBM 3-digit status LED
 704  */
 705 static unsigned int ibm_statusled_base;
 706
 707 static void
 708 ibm_statusled_progress(char *s, unsigned short hex);
 709
 710 static int
 711 ibm_statusled_panic(struct notifier_block *dummy1, unsigned long dummy2,
 712                     void * dummy3)
 713 {
 714         ibm_statusled_progress(NULL, 0x505); /* SOS */
 715         return NOTIFY_DONE;
 716 }
 717
 718 static struct notifier_block ibm_statusled_block = {
 719         ibm_statusled_panic,
 720         NULL,
 721         INT_MAX /* try to do it first */
 722 };
 723
 724 static void
 725 ibm_statusled_progress(char *s, unsigned short hex)
 726 {
 727         static int notifier_installed;
 728         /*
 729          * Progress uses 4 digits and we have only 3.  So, we map 0xffff to
 730          * 0xfff for display switch off.  Out of range values are mapped to
 731          * 0xeff, as I'm told 0xf00 and above are reserved for hardware codes.
 732          * Install the panic notifier when the display is first switched off.
 733          */
 734         if (hex == 0xffff) {
 735                 hex = 0xfff;
 736                 if (!notifier_installed) {
 737                         ++notifier_installed;
 738                         atomic_notifier_chain_register(&panic_notifier_list,
 739                                                 &ibm_statusled_block);
 740                 }
 741         }
 742         else
 743                 if (hex > 0xfff)
 744                         hex = 0xeff;
 745
 746         mb();
 747         outw(hex, ibm_statusled_base);
 748 }
 749
 750 static void __init
 751 ibm_statusled_init(void)
 752 {
 753         /*
 754          * The IBM 3-digit LED display is specified in the residual data
 755          * as an operator panel device, type "System Status LED".  Find
 756          * that device and determine its address.  We validate all the
 757          * other parameters on the off-chance another, similar device
 758          * exists.
 759          */
 760         if (have_residual_data) {
 761                 PPC_DEVICE *led;
 762                 PnP_TAG_PACKET *pkt;
 763
 764                 led = residual_find_device(~0, NULL, SystemPeripheral,
 765                                            OperatorPanel, SystemStatusLED, 0);
 766                 if (!led)
 767                         return;
 768
 769                 pkt = PnP_find_packet((unsigned char *)
 770                        &res->DevicePnPHeap[led->AllocatedOffset], S8_Packet, 0);
 771                 if (!pkt)
 772                         return;
 773
 774                 if (pkt->S8_Pack.IOInfo != ISAAddr16bit)
 775                         return;
 776                 if (*(unsigned short *)pkt->S8_Pack.RangeMin !=
 777                     *(unsigned short *)pkt->S8_Pack.RangeMax)
 778                         return;
 779                 if (pkt->S8_Pack.IOAlign != 2)
 780                         return;
 781                 if (pkt->S8_Pack.IONum != 2)
 782                         return;
 783
 784                 ibm_statusled_base = ld_le16((unsigned short *)
 785                                              (pkt->S8_Pack.RangeMin));
 786                 ppc_md.progress = ibm_statusled_progress;
 787         }
 788 }
 789
 790 static void __init
 791 prep_setup_arch(void)
 792 {
 793         unsigned char reg;
 794         int is_ide=0;
 795
 796         /* init to some ~sane value until calibrate_delay() runs */
 797         loops_per_jiffy = 50000000;
 798
 799         /* Lookup PCI host bridges */
 800         prep_find_bridges();
 801
 802         /* Set up floppy in PS/2 mode */
 803         outb(0x09, SIO_CONFIG_RA);
 804         reg = inb(SIO_CONFIG_RD);
 805         reg = (reg & 0x3F) | 0x40;
 806         outb(reg, SIO_CONFIG_RD);
 807         outb(reg, SIO_CONFIG_RD);       /* Have to write twice to change! */
 808
 809         switch ( _prep_type )
 810         {
 811         case _PREP_IBM:
 812                 reg = inb(PREP_IBM_PLANAR);
 813                 printk(KERN_INFO "IBM planar ID: %02x", reg);
 814                 switch (reg) {
 815                         case PREP_IBM_SANDALFOOT:
 816                                 prep_gen_enable_l2();
 817                                 setup_ibm_pci = prep_sandalfoot_setup_pci;
 818                                 ppc_md.power_off = prep_sig750_poweroff;
 819                                 ppc_md.show_cpuinfo = prep_sandalfoot_cpuinfo;
 820                                 break;
 821                         case PREP_IBM_THINKPAD:
 822                                 prep_gen_enable_l2();
 823                                 setup_ibm_pci = prep_thinkpad_setup_pci;
 824                                 ppc_md.power_off = prep_carrera_poweroff;
 825                                 ppc_md.show_cpuinfo = prep_thinkpad_cpuinfo;
 826                                 break;
 827                         default:
 828                                 if (have_residual_data) {
 829                                         prep_gen_enable_l2();
 830                                         setup_ibm_pci = prep_residual_setup_pci;
 831                                         ppc_md.power_off = prep_halt;
 832                                         ppc_md.show_cpuinfo = prep_gen_cpuinfo;
 833                                         break;
 834                                 }
 835                                 else
 836                                         printk(" - unknown! Assuming Carolina");
 837                                         /* fall through */
 838                         case PREP_IBM_CAROLINA_IDE_0:
 839                         case PREP_IBM_CAROLINA_IDE_1:
 840                         case PREP_IBM_CAROLINA_IDE_2:
 841                         case PREP_IBM_CAROLINA_IDE_3:
 842                                 is_ide = 1;
 843                         case PREP_IBM_CAROLINA_SCSI_0:
 844                         case PREP_IBM_CAROLINA_SCSI_1:
 845                         case PREP_IBM_CAROLINA_SCSI_2:
 846                         case PREP_IBM_CAROLINA_SCSI_3:
 847                                 prep_carolina_enable_l2();
 848                                 setup_ibm_pci = prep_carolina_setup_pci;
 849                                 ppc_md.power_off = prep_sig750_poweroff;
 850                                 ppc_md.show_cpuinfo = prep_carolina_cpuinfo;
 851                                 break;
 852                         case PREP_IBM_TIGER1_133:
 853                         case PREP_IBM_TIGER1_166:
 854                         case PREP_IBM_TIGER1_180:
 855                         case PREP_IBM_TIGER1_xxx:
 856                         case PREP_IBM_TIGER1_333:
 857                                 prep_carolina_enable_l2();
 858                                 setup_ibm_pci = prep_tiger1_setup_pci;
 859                                 ppc_md.power_off = prep_sig750_poweroff;
 860                                 ppc_md.show_cpuinfo = prep_tiger1_cpuinfo;
 861                                 break;
 862                 }
 863                 printk("\n");
 864
 865                 /* default root device */
 866                 if (is_ide)
 867                         ROOT_DEV = MKDEV(IDE0_MAJOR, 3);
 868                 else
 869                         ROOT_DEV = MKDEV(SCSI_DISK0_MAJOR, 3);
 870
 871                 break;
 872         case _PREP_Motorola:
 873                 prep_gen_enable_l2();
 874                 ppc_md.power_off = prep_halt;
 875                 ppc_md.show_cpuinfo = prep_mot_cpuinfo;
 876
 877 #ifdef CONFIG_BLK_DEV_INITRD
 878                 if (initrd_start)
 879                         ROOT_DEV = Root_RAM0;
 880                 else
 881 #endif
 882 #ifdef CONFIG_ROOT_NFS
 883                         ROOT_DEV = Root_NFS;
 884 #else
 885                         ROOT_DEV = Root_SDA2;
 886 #endif
 887                 break;
 888         }
 889
 890         /* Read in NVRAM data */
 891         init_prep_nvram();
 892
 893         /* if no bootargs, look in NVRAM */
 894         if ( cmd_line[0] == '\0' ) {
 895                 char *bootargs;
 896                  bootargs = prep_nvram_get_var("bootargs");
 897                  if (bootargs != NULL) {
 898                          strcpy(cmd_line, bootargs);
 899                          /* again.. */
 900                          strcpy(boot_command_line, cmd_line);
 901                 }
 902         }
 903
 904 #ifdef CONFIG_SOUND_CS4232
 905         prep_init_sound();
 906 #endif /* CONFIG_SOUND_CS4232 */
 907
 908         prep_init_vesa();
 909
 910         switch (_prep_type) {
 911         case _PREP_Motorola:
 912                 raven_init();
 913                 break;
 914         case _PREP_IBM:
 915                 ibm_prep_init();
 916                 break;
 917         }
 918
 919 #ifdef CONFIG_VGA_CONSOLE
 920         /* vgacon.c needs to know where we mapped IO memory in io_block_mapping() */
 921         vgacon_remap_base = 0xf0000000;
 922         conswitchp = &vga_con;
 923 #endif
 924 }
 925
 926 /*
 927  * First, see if we can get this information from the residual data.
 928  * This is important on some IBM PReP systems.  If we cannot, we let the
 929  * TODC code handle doing this.
 930  */
 931 static void __init
 932 prep_calibrate_decr(void)
 933 {
 934         if (have_residual_data) {
 935                 unsigned long freq, divisor = 4;
 936
 937                 if ( res->VitalProductData.ProcessorBusHz ) {
 938                         freq = res->VitalProductData.ProcessorBusHz;
 939                         printk("time_init: decrementer frequency = %lu.%.6lu MHz\n",
 940                                         (freq/divisor)/1000000,
 941                                         (freq/divisor)%1000000);
 942                         tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
 943                         tb_ticks_per_jiffy = freq / HZ / divisor;
 944                 }
 945         }
 946         else
 947                 todc_calibrate_decr();
 948 }
 949
 950 static void __init
 951 prep_init_IRQ(void)
 952 {
 953         unsigned int pci_viddid, pci_did;
 954
 955         if (OpenPIC_Addr != NULL) {
 956                 openpic_init(NUM_8259_INTERRUPTS);
 957                 /* We have a cascade on OpenPIC IRQ 0, Linux IRQ 16 */
 958                 openpic_hookup_cascade(NUM_8259_INTERRUPTS, "82c59 cascade",
 959                                        i8259_irq);
 960         }
 961
 962         if (have_residual_data) {
 963                 i8259_init(residual_isapic_addr(), 0);
 964                 return;
 965         }
 966
 967         /* If we have a Raven PCI bridge or a Hawk PCI bridge / Memory
 968          * controller, we poll (as they have a different int-ack address). */
 969         early_read_config_dword(NULL, 0, 0, PCI_VENDOR_ID, &pci_viddid);
 970         pci_did = (pci_viddid & 0xffff0000) >> 16;
 971         if (((pci_viddid & 0xffff) == PCI_VENDOR_ID_MOTOROLA)
 972                         && ((pci_did == PCI_DEVICE_ID_MOTOROLA_RAVEN)
 973                                 || (pci_did == PCI_DEVICE_ID_MOTOROLA_HAWK)))
 974                 i8259_init(0, 0);
 975         else
 976                 /* PCI interrupt ack address given in section 6.1.8 of the
 977                  * PReP specification. */
 978                 i8259_init(MPC10X_MAPA_PCI_INTACK_ADDR, 0);
 979 }
 980
 981 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
 982 /*
 983  * IDE stuff.
 984  */
 985 static int
 986 prep_ide_default_irq(unsigned long base)
 987 {
 988         switch (base) {
 989                 case 0x1f0: return 13;
 990                 case 0x170: return 13;
 991                 case 0x1e8: return 11;
 992                 case 0x168: return 10;
 993                 case 0xfff0: return 14;         /* MCP(N)750 ide0 */
 994                 case 0xffe0: return 15;         /* MCP(N)750 ide1 */
 995                 default: return 0;
 996         }
 997 }
 998
 999 static unsigned long
1000 prep_ide_default_io_base(int index)
1001 {
1002         switch (index) {
1003                 case 0: return 0x1f0;
1004                 case 1: return 0x170;
1005                 case 2: return 0x1e8;
1006                 case 3: return 0x168;
1007                 default:
1008                         return 0;
1009         }
1010 }
1011 #endif
1012
1013 #ifdef CONFIG_SMP
1014 /* PReP (MTX) support */
1015 static int __init
1016 smp_prep_probe(void)
1017 {
1018         extern int mot_multi;
1019
1020         if (mot_multi) {
1021                 openpic_request_IPIs();
1022                 smp_hw_index[1] = 1;
1023                 return 2;
1024         }
1025
1026         return 1;
1027 }
1028
1029 static void __init
1030 smp_prep_kick_cpu(int nr)
1031 {
1032         *(unsigned long *)KERNELBASE = nr;
1033         asm volatile("dcbf 0,%0"::"r"(KERNELBASE):"memory");
1034         printk("CPU1 released, waiting\n");
1035 }
1036
1037 static void __init
1038 smp_prep_setup_cpu(int cpu_nr)
1039 {
1040         if (OpenPIC_Addr)
1041                 do_openpic_setup_cpu();
1042 }
1043
1044 static struct smp_ops_t prep_smp_ops = {
1045         smp_openpic_message_pass,
1046         smp_prep_probe,
1047         smp_prep_kick_cpu,
1048         smp_prep_setup_cpu,
1049         .give_timebase = smp_generic_give_timebase,
1050         .take_timebase = smp_generic_take_timebase,
1051 };
1052 #endif /* CONFIG_SMP */
1053
1054 /*
1055  * Setup the bat mappings we're going to load that cover
1056  * the io areas.  RAM was mapped by mapin_ram().
1057  * -- Cort
1058  */
1059 static void __init
1060 prep_map_io(void)
1061 {
1062         io_block_mapping(0x80000000, PREP_ISA_IO_BASE, 0x10000000, _PAGE_IO);
1063         io_block_mapping(0xf0000000, PREP_ISA_MEM_BASE, 0x08000000, _PAGE_IO);
1064 }
1065
1066 static int __init
1067 prep_request_io(void)
1068 {
1069 #ifdef CONFIG_NVRAM
1070         request_region(PREP_NVRAM_AS0, 0x8, "nvram");
1071 #endif
1072         request_region(0x00,0x20,"dma1");
1073         request_region(0x40,0x20,"timer");
1074         request_region(0x80,0x10,"dma page reg");
1075         request_region(0xc0,0x20,"dma2");
1076
1077         return 0;
1078 }
1079
1080 device_initcall(prep_request_io);
1081
1082 void __init
1083 prep_init(unsigned long r3, unsigned long r4, unsigned long r5,
1084                 unsigned long r6, unsigned long r7)
1085 {
1086 #ifdef CONFIG_PREP_RESIDUAL
1087         /* make a copy of residual data */
1088         if ( r3 ) {
1089                 memcpy((void *)res,(void *)(r3+KERNELBASE),
1090                          sizeof(RESIDUAL));
1091         }
1092 #endif
1093
1094         isa_io_base = PREP_ISA_IO_BASE;
1095         isa_mem_base = PREP_ISA_MEM_BASE;
1096         pci_dram_offset = PREP_PCI_DRAM_OFFSET;
1097         ISA_DMA_THRESHOLD = 0x00ffffff;
1098         DMA_MODE_READ = 0x44;
1099         DMA_MODE_WRITE = 0x48;
1100         ppc_do_canonicalize_irqs = 1;
1101
1102         /* figure out what kind of prep workstation we are */
1103         if (have_residual_data) {
1104                 if ( !strncmp(res->VitalProductData.PrintableModel,"IBM",3) )
1105                         _prep_type = _PREP_IBM;
1106                 else
1107                         _prep_type = _PREP_Motorola;
1108         }
1109         else {
1110                 /* assume motorola if no residual (netboot?) */
1111                 _prep_type = _PREP_Motorola;
1112         }
1113
1114 #ifdef CONFIG_PREP_RESIDUAL
1115         /* Switch off all residual data processing if the user requests it */
1116         if (strstr(cmd_line, "noresidual") != NULL)
1117                         res = NULL;
1118 #endif
1119
1120         /* Initialise progress early to get maximum benefit */
1121         prep_set_bat();
1122         ibm_statusled_init();
1123
1124         ppc_md.setup_arch     = prep_setup_arch;
1125         ppc_md.show_percpuinfo = prep_show_percpuinfo;
1126         ppc_md.show_cpuinfo   = NULL; /* set in prep_setup_arch() */
1127         ppc_md.init_IRQ       = prep_init_IRQ;
1128         /* this gets changed later on if we have an OpenPIC -- Cort */
1129         ppc_md.get_irq        = i8259_irq;
1130
1131         ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;
1132
1133         ppc_md.restart        = prep_restart;
1134         ppc_md.power_off      = NULL; /* set in prep_setup_arch() */
1135         ppc_md.halt           = prep_halt;
1136
1137         ppc_md.nvram_read_val = prep_nvram_read_val;
1138         ppc_md.nvram_write_val = prep_nvram_write_val;
1139
1140         ppc_md.time_init      = todc_time_init;
1141         if (_prep_type == _PREP_IBM) {
1142                 ppc_md.rtc_read_val = todc_mc146818_read_val;
1143                 ppc_md.rtc_write_val = todc_mc146818_write_val;
1144                 TODC_INIT(TODC_TYPE_MC146818, RTC_PORT(0), NULL, RTC_PORT(1),
1145                                 8);
1146         } else {
1147                 TODC_INIT(TODC_TYPE_MK48T59, PREP_NVRAM_AS0, PREP_NVRAM_AS1,
1148                                 PREP_NVRAM_DATA, 8);
1149         }
1150
1151         ppc_md.calibrate_decr = prep_calibrate_decr;
1152         ppc_md.set_rtc_time   = todc_set_rtc_time;
1153         ppc_md.get_rtc_time   = todc_get_rtc_time;
1154
1155         ppc_md.setup_io_mappings = prep_map_io;
1156
1157 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
1158         ppc_ide_md.default_irq = prep_ide_default_irq;
1159         ppc_ide_md.default_io_base = prep_ide_default_io_base;
1160 #endif
1161
1162 #ifdef CONFIG_SMP
1163         smp_ops                  = &prep_smp_ops;
1164 #endif /* CONFIG_SMP */
1165 }