board/amcc/yosemite/yosemite.c

   1 /*
   2  * (C) Copyright 2006-2007
   3  * Stefan Roese, DENX Software Engineering, sr@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <ppc4xx.h>
  26 #include <asm/processor.h>
  27 #include <asm/io.h>
  28 #include <spd_sdram.h>
  29
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 extern flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips    */
  33
  34 int board_early_init_f(void)
  35 {
  36         register uint reg;
  37
  38         /*--------------------------------------------------------------------
  39          * Setup the external bus controller/chip selects
  40          *-------------------------------------------------------------------*/
  41         mtdcr(ebccfga, xbcfg);
  42         reg = mfdcr(ebccfgd);
  43         mtdcr(ebccfgd, reg | 0x04000000);       /* Set ATC */
  44
  45         /*--------------------------------------------------------------------
  46          * Setup the GPIO pins
  47          *-------------------------------------------------------------------*/
  48         /*CPLD cs */
  49         /*setup Address lines for flash size 64Meg. */
  50         out32(GPIO0_OSRL, in32(GPIO0_OSRL) | 0x50010000);
  51         out32(GPIO0_TSRL, in32(GPIO0_TSRL) | 0x50010000);
  52         out32(GPIO0_ISR1L, in32(GPIO0_ISR1L) | 0x50000000);
  53
  54         /*setup emac */
  55         out32(GPIO0_TCR, in32(GPIO0_TCR) | 0xC080);
  56         out32(GPIO0_TSRL, in32(GPIO0_TSRL) | 0x40);
  57         out32(GPIO0_ISR1L, in32(GPIO0_ISR1L) | 0x55);
  58         out32(GPIO0_OSRH, in32(GPIO0_OSRH) | 0x50004000);
  59         out32(GPIO0_ISR1H, in32(GPIO0_ISR1H) | 0x00440000);
  60
  61         /*UART1 */
  62         out32(GPIO1_TCR, in32(GPIO1_TCR) | 0x02000000);
  63         out32(GPIO1_OSRL, in32(GPIO1_OSRL) | 0x00080000);
  64         out32(GPIO1_ISR2L, in32(GPIO1_ISR2L) | 0x00010000);
  65
  66         /* external interrupts IRQ0...3 */
  67         out32(GPIO1_TCR, in32(GPIO1_TCR) & ~0x00f00000);
  68         out32(GPIO1_TSRL, in32(GPIO1_TSRL) & ~0x0000ff00);
  69         out32(GPIO1_ISR1L, in32(GPIO1_ISR1L) | 0x00005500);
  70
  71 #ifdef CONFIG_440EP
  72         /*setup USB 2.0 */
  73         out32(GPIO1_TCR, in32(GPIO1_TCR) | 0xc0000000);
  74         out32(GPIO1_OSRL, in32(GPIO1_OSRL) | 0x50000000);
  75         out32(GPIO0_TCR, in32(GPIO0_TCR) | 0xf);
  76         out32(GPIO0_OSRH, in32(GPIO0_OSRH) | 0xaa);
  77         out32(GPIO0_ISR2H, in32(GPIO0_ISR2H) | 0x00000500);
  78 #endif
  79
  80         /*--------------------------------------------------------------------
  81          * Setup the interrupt controller polarities, triggers, etc.
  82          *-------------------------------------------------------------------*/
  83         mtdcr(uic0sr, 0xffffffff);      /* clear all */
  84         mtdcr(uic0er, 0x00000000);      /* disable all */
  85         mtdcr(uic0cr, 0x00000009);      /* ATI & UIC1 crit are critical */
  86         mtdcr(uic0pr, 0xfffffe13);      /* per ref-board manual */
  87         mtdcr(uic0tr, 0x01c00008);      /* per ref-board manual */
  88         mtdcr(uic0vr, 0x00000001);      /* int31 highest, base=0x000 */
  89         mtdcr(uic0sr, 0xffffffff);      /* clear all */
  90
  91         mtdcr(uic1sr, 0xffffffff);      /* clear all */
  92         mtdcr(uic1er, 0x00000000);      /* disable all */
  93         mtdcr(uic1cr, 0x00000000);      /* all non-critical */
  94         mtdcr(uic1pr, 0xffffe0ff);      /* per ref-board manual */
  95         mtdcr(uic1tr, 0x00ffc000);      /* per ref-board manual */
  96         mtdcr(uic1vr, 0x00000001);      /* int31 highest, base=0x000 */
  97         mtdcr(uic1sr, 0xffffffff);      /* clear all */
  98
  99         /*--------------------------------------------------------------------
 100          * Setup other serial configuration
 101          *-------------------------------------------------------------------*/
 102         mfsdr(sdr_pci0, reg);
 103         mtsdr(sdr_pci0, 0x80000000 | reg);      /* PCI arbiter enabled */
 104         mtsdr(sdr_pfc0, 0x00003e00);    /* Pin function */
 105         mtsdr(sdr_pfc1, 0x00048000);    /* Pin function: UART0 has 4 pins */
 106
 107         /*clear tmrclk divisor */
 108         *(unsigned char *)(CFG_BCSR_BASE | 0x04) = 0x00;
 109
 110         /*enable ethernet */
 111         *(unsigned char *)(CFG_BCSR_BASE | 0x08) = 0xf0;
 112
 113 #ifdef CONFIG_440EP
 114         /*enable usb 1.1 fs device and remove usb 2.0 reset */
 115         *(unsigned char *)(CFG_BCSR_BASE | 0x09) = 0x00;
 116 #endif
 117
 118         /*get rid of flash write protect */
 119         *(unsigned char *)(CFG_BCSR_BASE | 0x07) = 0x00;
 120
 121         return 0;
 122 }
 123
 124 int misc_init_r (void)
 125 {
 126         uint pbcr;
 127         int size_val = 0;
 128
 129         /* Re-do sizing to get full correct info */
 130         mtdcr(ebccfga, pb0cr);
 131         pbcr = mfdcr(ebccfgd);
 132         switch (gd->bd->bi_flashsize) {
 133         case 1 << 20:
 134                 size_val = 0;
 135                 break;
 136         case 2 << 20:
 137                 size_val = 1;
 138                 break;
 139         case 4 << 20:
 140                 size_val = 2;
 141                 break;
 142         case 8 << 20:
 143                 size_val = 3;
 144                 break;
 145         case 16 << 20:
 146                 size_val = 4;
 147                 break;
 148         case 32 << 20:
 149                 size_val = 5;
 150                 break;
 151         case 64 << 20:
 152                 size_val = 6;
 153                 break;
 154         case 128 << 20:
 155                 size_val = 7;
 156                 break;
 157         }
 158         pbcr = (pbcr & 0x0001ffff) | gd->bd->bi_flashstart | (size_val << 17);
 159         mtdcr(ebccfga, pb0cr);
 160         mtdcr(ebccfgd, pbcr);
 161
 162         /* adjust flash start and offset */
 163         gd->bd->bi_flashstart = 0 - gd->bd->bi_flashsize;
 164         gd->bd->bi_flashoffset = 0;
 165
 166         /* Monitor protection ON by default */
 167         (void)flash_protect(FLAG_PROTECT_SET,
 168                             -CFG_MONITOR_LEN,
 169                             0xffffffff,
 170                             &flash_info[0]);
 171
 172         return 0;
 173 }
 174
 175 int checkboard(void)
 176 {
 177         char *s = getenv("serial#");
 178         u8 rev;
 179         u8 val;
 180
 181 #ifdef CONFIG_440EP
 182         printf("Board: Yosemite - AMCC PPC440EP Evaluation Board");
 183 #else
 184         printf("Board: Yellowstone - AMCC PPC440GR Evaluation Board");
 185 #endif
 186
 187         rev = in_8((void *)(CFG_BCSR_BASE + 0));
 188         val = in_8((void *)(CFG_BCSR_BASE + 5)) & CFG_BCSR5_PCI66EN;
 189         printf(", Rev. %X, PCI=%d MHz", rev, val ? 66 : 33);
 190
 191         if (s != NULL) {
 192                 puts(", serial# ");
 193                 puts(s);
 194         }
 195         putc('\n');
 196
 197         return (0);
 198 }
 199
 200 /*************************************************************************
 201  *  sdram_init -- doesn't use serial presence detect.
 202  *
 203  *  Assumes:    256 MB, ECC, non-registered
 204  *              PLB @ 133 MHz
 205  *
 206  ************************************************************************/
 207 #define NUM_TRIES 64
 208 #define NUM_READS 10
 209
 210 void sdram_tr1_set(int ram_address, int* tr1_value)
 211 {
 212         int i;
 213         int j, k;
 214         volatile unsigned int* ram_pointer =  (unsigned int*)ram_address;
 215         int first_good = -1, last_bad = 0x1ff;
 216
 217         unsigned long test[NUM_TRIES] = {
 218                 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
 219                 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
 220                 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
 221                 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
 222                 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
 223                 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
 224                 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
 225                 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
 226                 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
 227                 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
 228                 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
 229                 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
 230                 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
 231                 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
 232                 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
 233                 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55 };
 234
 235         /* go through all possible SDRAM0_TR1[RDCT] values */
 236         for (i=0; i<=0x1ff; i++) {
 237                 /* set the current value for TR1 */
 238                 mtsdram(mem_tr1, (0x80800800 | i));
 239
 240                 /* write values */
 241                 for (j=0; j<NUM_TRIES; j++) {
 242                         ram_pointer[j] = test[j];
 243
 244                         /* clear any cache at ram location */
 245                         __asm__("dcbf 0,%0": :"r" (&ram_pointer[j]));
 246                 }
 247
 248                 /* read values back */
 249                 for (j=0; j<NUM_TRIES; j++) {
 250                         for (k=0; k<NUM_READS; k++) {
 251                                 /* clear any cache at ram location */
 252                                 __asm__("dcbf 0,%0": :"r" (&ram_pointer[j]));
 253
 254                                 if (ram_pointer[j] != test[j])
 255                                         break;
 256                         }
 257
 258                         /* read error */
 259                         if (k != NUM_READS) {
 260                                 break;
 261                         }
 262                 }
 263
 264                 /* we have a SDRAM0_TR1[RDCT] that is part of the window */
 265                 if (j == NUM_TRIES) {
 266                         if (first_good == -1)
 267                                 first_good = i;         /* found beginning of window */
 268                 } else { /* bad read */
 269                         /* if we have not had a good read then don't care */
 270                         if(first_good != -1) {
 271                                 /* first failure after a good read */
 272                                 last_bad = i-1;
 273                                 break;
 274                         }
 275                 }
 276         }
 277
 278         /* return the current value for TR1 */
 279         *tr1_value = (first_good + last_bad) / 2;
 280 }
 281
 282 void sdram_init(void)
 283 {
 284         register uint reg;
 285         int tr1_bank1, tr1_bank2;
 286
 287         /*--------------------------------------------------------------------
 288          * Setup some default
 289          *------------------------------------------------------------------*/
 290         mtsdram(mem_uabba, 0x00000000); /* ubba=0 (default)             */
 291         mtsdram(mem_slio, 0x00000000);  /* rdre=0 wrre=0 rarw=0         */
 292         mtsdram(mem_devopt, 0x00000000);        /* dll=0 ds=0 (normal)          */
 293         mtsdram(mem_clktr, 0x40000000); /* ?? */
 294         mtsdram(mem_wddctr, 0x40000000);        /* ?? */
 295
 296         /*clear this first, if the DDR is enabled by a debugger
 297           then you can not make changes. */
 298         mtsdram(mem_cfg0, 0x00000000);  /* Disable EEC */
 299
 300         /*--------------------------------------------------------------------
 301          * Setup for board-specific specific mem
 302          *------------------------------------------------------------------*/
 303         /*
 304          * Following for CAS Latency = 2.5 @ 133 MHz PLB
 305          */
 306         mtsdram(mem_b0cr, 0x000a4001);  /* SDBA=0x000 128MB, Mode 3, enabled */
 307         mtsdram(mem_b1cr, 0x080a4001);  /* SDBA=0x080 128MB, Mode 3, enabled */
 308
 309         mtsdram(mem_tr0, 0x410a4012);   /* ?? */
 310         mtsdram(mem_rtr, 0x04080000);   /* ?? */
 311         mtsdram(mem_cfg1, 0x00000000);  /* Self-refresh exit, disable PM    */
 312         mtsdram(mem_cfg0, 0x30000000);  /* Disable EEC */
 313         udelay(400);            /* Delay 200 usecs (min)            */
 314
 315         /*--------------------------------------------------------------------
 316          * Enable the controller, then wait for DCEN to complete
 317          *------------------------------------------------------------------*/
 318         mtsdram(mem_cfg0, 0x80000000);  /* Enable */
 319
 320         for (;;) {
 321                 mfsdram(mem_mcsts, reg);
 322                 if (reg & 0x80000000)
 323                         break;
 324         }
 325
 326         sdram_tr1_set(0x00000000, &tr1_bank1);
 327         sdram_tr1_set(0x08000000, &tr1_bank2);
 328         mtsdram(mem_tr1, (((tr1_bank1+tr1_bank2)/2) | 0x80800800) );
 329 }
 330
 331 /*************************************************************************
 332  *  long int initdram
 333  *
 334  ************************************************************************/
 335 long int initdram(int board)
 336 {
 337         sdram_init();
 338         return CFG_SDRAM_BANKS * (CFG_KBYTES_SDRAM * 1024);     /* return bytes */
 339 }
 340
 341 #if defined(CFG_DRAM_TEST)
 342 int testdram(void)
 343 {
 344         unsigned long *mem = (unsigned long *)0;
 345         const unsigned long kend = (1024 / sizeof(unsigned long));
 346         unsigned long k, n;
 347
 348         mtmsr(0);
 349
 350         for (k = 0; k < CFG_KBYTES_SDRAM;
 351              ++k, mem += (1024 / sizeof(unsigned long))) {
 352                 if ((k & 1023) == 0) {
 353                         printf("%3d MB\r", k / 1024);
 354                 }
 355
 356                 memset(mem, 0xaaaaaaaa, 1024);
 357                 for (n = 0; n < kend; ++n) {
 358                         if (mem[n] != 0xaaaaaaaa) {
 359                                 printf("SDRAM test fails at: %08x\n",
 360                                        (uint) & mem[n]);
 361                                 return 1;
 362                         }
 363                 }
 364
 365                 memset(mem, 0x55555555, 1024);
 366                 for (n = 0; n < kend; ++n) {
 367                         if (mem[n] != 0x55555555) {
 368                                 printf("SDRAM test fails at: %08x\n",
 369                                        (uint) & mem[n]);
 370                                 return 1;
 371                         }
 372                 }
 373         }
 374         printf("SDRAM test passes\n");
 375         return 0;
 376 }
 377 #endif
 378
 379 /*************************************************************************
 380  *  pci_pre_init
 381  *
 382  *  This routine is called just prior to registering the hose and gives
 383  *  the board the opportunity to check things. Returning a value of zero
 384  *  indicates that things are bad & PCI initialization should be aborted.
 385  *
 386  *      Different boards may wish to customize the pci controller structure
 387  *      (add regions, override default access routines, etc) or perform
 388  *      certain pre-initialization actions.
 389  *
 390  ************************************************************************/
 391 #if defined(CONFIG_PCI)
 392 int pci_pre_init(struct pci_controller *hose)
 393 {
 394         unsigned long addr;
 395
 396         /*-------------------------------------------------------------------------+
 397           | Set priority for all PLB3 devices to 0.
 398           | Set PLB3 arbiter to fair mode.
 399           +-------------------------------------------------------------------------*/
 400         mfsdr(sdr_amp1, addr);
 401         mtsdr(sdr_amp1, (addr & 0x000000FF) | 0x0000FF00);
 402         addr = mfdcr(plb3_acr);
 403         mtdcr(plb3_acr, addr | 0x80000000);
 404
 405         /*-------------------------------------------------------------------------+
 406           | Set priority for all PLB4 devices to 0.
 407           +-------------------------------------------------------------------------*/
 408         mfsdr(sdr_amp0, addr);
 409         mtsdr(sdr_amp0, (addr & 0x000000FF) | 0x0000FF00);
 410         addr = mfdcr(plb4_acr) | 0xa0000000;    /* Was 0x8---- */
 411         mtdcr(plb4_acr, addr);
 412
 413         /*-------------------------------------------------------------------------+
 414           | Set Nebula PLB4 arbiter to fair mode.
 415           +-------------------------------------------------------------------------*/
 416         /* Segment0 */
 417         addr = (mfdcr(plb0_acr) & ~plb0_acr_ppm_mask) | plb0_acr_ppm_fair;
 418         addr = (addr & ~plb0_acr_hbu_mask) | plb0_acr_hbu_enabled;
 419         addr = (addr & ~plb0_acr_rdp_mask) | plb0_acr_rdp_4deep;
 420         addr = (addr & ~plb0_acr_wrp_mask) | plb0_acr_wrp_2deep;
 421         mtdcr(plb0_acr, addr);
 422
 423         /* Segment1 */
 424         addr = (mfdcr(plb1_acr) & ~plb1_acr_ppm_mask) | plb1_acr_ppm_fair;
 425         addr = (addr & ~plb1_acr_hbu_mask) | plb1_acr_hbu_enabled;
 426         addr = (addr & ~plb1_acr_rdp_mask) | plb1_acr_rdp_4deep;
 427         addr = (addr & ~plb1_acr_wrp_mask) | plb1_acr_wrp_2deep;
 428         mtdcr(plb1_acr, addr);
 429
 430         return 1;
 431 }
 432 #endif  /* defined(CONFIG_PCI) */
 433
 434 /*************************************************************************
 435  *  pci_target_init
 436  *
 437  *      The bootstrap configuration provides default settings for the pci
 438  *      inbound map (PIM). But the bootstrap config choices are limited and
 439  *      may not be sufficient for a given board.
 440  *
 441  ************************************************************************/
 442 #if defined(CONFIG_PCI) && defined(CFG_PCI_TARGET_INIT)
 443 void pci_target_init(struct pci_controller *hose)
 444 {
 445         /*--------------------------------------------------------------------------+
 446          * Set up Direct MMIO registers
 447          *--------------------------------------------------------------------------*/
 448         /*--------------------------------------------------------------------------+
 449           | PowerPC440 EP PCI Master configuration.
 450           | Map one 1Gig range of PLB/processor addresses to PCI memory space.
 451           |   PLB address 0xA0000000-0xDFFFFFFF ==> PCI address 0xA0000000-0xDFFFFFFF
 452           |   Use byte reversed out routines to handle endianess.
 453           | Make this region non-prefetchable.
 454           +--------------------------------------------------------------------------*/
 455         out32r(PCIX0_PMM0MA, 0x00000000);       /* PMM0 Mask/Attribute - disabled b4 setting */
 456         out32r(PCIX0_PMM0LA, CFG_PCI_MEMBASE);  /* PMM0 Local Address */
 457         out32r(PCIX0_PMM0PCILA, CFG_PCI_MEMBASE);       /* PMM0 PCI Low Address */
 458         out32r(PCIX0_PMM0PCIHA, 0x00000000);    /* PMM0 PCI High Address */
 459         out32r(PCIX0_PMM0MA, 0xE0000001);       /* 512M + No prefetching, and enable region */
 460
 461         out32r(PCIX0_PMM1MA, 0x00000000);       /* PMM0 Mask/Attribute - disabled b4 setting */
 462         out32r(PCIX0_PMM1LA, CFG_PCI_MEMBASE2); /* PMM0 Local Address */
 463         out32r(PCIX0_PMM1PCILA, CFG_PCI_MEMBASE2);      /* PMM0 PCI Low Address */
 464         out32r(PCIX0_PMM1PCIHA, 0x00000000);    /* PMM0 PCI High Address */
 465         out32r(PCIX0_PMM1MA, 0xE0000001);       /* 512M + No prefetching, and enable region */
 466
 467         out32r(PCIX0_PTM1MS, 0x00000001);       /* Memory Size/Attribute */
 468         out32r(PCIX0_PTM1LA, 0);        /* Local Addr. Reg */
 469         out32r(PCIX0_PTM2MS, 0);        /* Memory Size/Attribute */
 470         out32r(PCIX0_PTM2LA, 0);        /* Local Addr. Reg */
 471
 472         /*--------------------------------------------------------------------------+
 473          * Set up Configuration registers
 474          *--------------------------------------------------------------------------*/
 475
 476         /* Program the board's subsystem id/vendor id */
 477         pci_write_config_word(0, PCI_SUBSYSTEM_VENDOR_ID,
 478                               CFG_PCI_SUBSYS_VENDORID);
 479         pci_write_config_word(0, PCI_SUBSYSTEM_ID, CFG_PCI_SUBSYS_ID);
 480
 481         /* Configure command register as bus master */
 482         pci_write_config_word(0, PCI_COMMAND, PCI_COMMAND_MASTER);
 483
 484         /* 240nS PCI clock */
 485         pci_write_config_word(0, PCI_LATENCY_TIMER, 1);
 486
 487         /* No error reporting */
 488         pci_write_config_word(0, PCI_ERREN, 0);
 489
 490         pci_write_config_dword(0, PCI_BRDGOPT2, 0x00000101);
 491
 492 }
 493 #endif                          /* defined(CONFIG_PCI) && defined(CFG_PCI_TARGET_INIT) */
 494
 495 /*************************************************************************
 496  *  pci_master_init
 497  *
 498  ************************************************************************/
 499 #if defined(CONFIG_PCI) && defined(CFG_PCI_MASTER_INIT)
 500 void pci_master_init(struct pci_controller *hose)
 501 {
 502         unsigned short temp_short;
 503
 504         /*--------------------------------------------------------------------------+
 505           | Write the PowerPC440 EP PCI Configuration regs.
 506           |   Enable PowerPC440 EP to be a master on the PCI bus (PMM).
 507           |   Enable PowerPC440 EP to act as a PCI memory target (PTM).
 508           +--------------------------------------------------------------------------*/
 509         pci_read_config_word(0, PCI_COMMAND, &temp_short);
 510         pci_write_config_word(0, PCI_COMMAND,
 511                               temp_short | PCI_COMMAND_MASTER |
 512                               PCI_COMMAND_MEMORY);
 513 }
 514 #endif                          /* defined(CONFIG_PCI) && defined(CFG_PCI_MASTER_INIT) */
 515
 516 /*************************************************************************
 517  *  is_pci_host
 518  *
 519  *      This routine is called to determine if a pci scan should be
 520  *      performed. With various hardware environments (especially cPCI and
 521  *      PPMC) it's insufficient to depend on the state of the arbiter enable
 522  *      bit in the strap register, or generic host/adapter assumptions.
 523  *
 524  *      Rather than hard-code a bad assumption in the general 440 code, the
 525  *      440 pci code requires the board to decide at runtime.
 526  *
 527  *      Return 0 for adapter mode, non-zero for host (monarch) mode.
 528  *
 529  *
 530  ************************************************************************/
 531 #if defined(CONFIG_PCI)
 532 int is_pci_host(struct pci_controller *hose)
 533 {
 534         /* Bamboo is always configured as host. */
 535         return (1);
 536 }
 537 #endif                          /* defined(CONFIG_PCI) */
 538
 539 /*************************************************************************
 540  *  hw_watchdog_reset
 541  *
 542  *      This routine is called to reset (keep alive) the watchdog timer
 543  *
 544  ************************************************************************/
 545 #if defined(CONFIG_HW_WATCHDOG)
 546 void hw_watchdog_reset(void)
 547 {
 548
 549 }
 550 #endif
 551
 552 void board_reset(void)
 553 {
 554         /* give reset to BCSR */
 555         *(unsigned char *)(CFG_BCSR_BASE | 0x06) = 0x09;
 556 }