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 #include <libfdt.h>
  30 #include <fdt_support.h>
  31
  32 DECLARE_GLOBAL_DATA_PTR;
  33
  34 extern flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips     */
  35
  36 int board_early_init_f(void)
  37 {
  38         register uint reg;
  39
  40         /*--------------------------------------------------------------------
  41          * Setup the external bus controller/chip selects
  42          *-------------------------------------------------------------------*/
  43         mtdcr(ebccfga, xbcfg);
  44         reg = mfdcr(ebccfgd);
  45         mtdcr(ebccfgd, reg | 0x04000000);       /* Set ATC */
  46
  47         /*--------------------------------------------------------------------
  48          * Setup the GPIO pins
  49          *-------------------------------------------------------------------*/
  50         /*CPLD cs */
  51         /*setup Address lines for flash size 64Meg. */
  52         out32(GPIO0_OSRL, in32(GPIO0_OSRL) | 0x50010000);
  53         out32(GPIO0_TSRL, in32(GPIO0_TSRL) | 0x50010000);
  54         out32(GPIO0_ISR1L, in32(GPIO0_ISR1L) | 0x50000000);
  55
  56         /*setup emac */
  57         out32(GPIO0_TCR, in32(GPIO0_TCR) | 0xC080);
  58         out32(GPIO0_TSRL, in32(GPIO0_TSRL) | 0x40);
  59         out32(GPIO0_ISR1L, in32(GPIO0_ISR1L) | 0x55);
  60         out32(GPIO0_OSRH, in32(GPIO0_OSRH) | 0x50004000);
  61         out32(GPIO0_ISR1H, in32(GPIO0_ISR1H) | 0x00440000);
  62
  63         /*UART1 */
  64         out32(GPIO1_TCR, in32(GPIO1_TCR) | 0x02000000);
  65         out32(GPIO1_OSRL, in32(GPIO1_OSRL) | 0x00080000);
  66         out32(GPIO1_ISR2L, in32(GPIO1_ISR2L) | 0x00010000);
  67
  68         /* external interrupts IRQ0...3 */
  69         out32(GPIO1_TCR, in32(GPIO1_TCR) & ~0x00f00000);
  70         out32(GPIO1_TSRL, in32(GPIO1_TSRL) & ~0x0000ff00);
  71         out32(GPIO1_ISR1L, in32(GPIO1_ISR1L) | 0x00005500);
  72
  73 #ifdef CONFIG_440EP
  74         /*setup USB 2.0 */
  75         out32(GPIO1_TCR, in32(GPIO1_TCR) | 0xc0000000);
  76         out32(GPIO1_OSRL, in32(GPIO1_OSRL) | 0x50000000);
  77         out32(GPIO0_TCR, in32(GPIO0_TCR) | 0xf);
  78         out32(GPIO0_OSRH, in32(GPIO0_OSRH) | 0xaa);
  79         out32(GPIO0_ISR2H, in32(GPIO0_ISR2H) | 0x00000500);
  80 #endif
  81
  82         /*--------------------------------------------------------------------
  83          * Setup the interrupt controller polarities, triggers, etc.
  84          *-------------------------------------------------------------------*/
  85         mtdcr(uic0sr, 0xffffffff);      /* clear all */
  86         mtdcr(uic0er, 0x00000000);      /* disable all */
  87         mtdcr(uic0cr, 0x00000009);      /* ATI & UIC1 crit are critical */
  88         mtdcr(uic0pr, 0xfffffe13);      /* per ref-board manual */
  89         mtdcr(uic0tr, 0x01c00008);      /* per ref-board manual */
  90         mtdcr(uic0vr, 0x00000001);      /* int31 highest, base=0x000 */
  91         mtdcr(uic0sr, 0xffffffff);      /* clear all */
  92
  93         mtdcr(uic1sr, 0xffffffff);      /* clear all */
  94         mtdcr(uic1er, 0x00000000);      /* disable all */
  95         mtdcr(uic1cr, 0x00000000);      /* all non-critical */
  96         mtdcr(uic1pr, 0xffffe0ff);      /* per ref-board manual */
  97         mtdcr(uic1tr, 0x00ffc000);      /* per ref-board manual */
  98         mtdcr(uic1vr, 0x00000001);      /* int31 highest, base=0x000 */
  99         mtdcr(uic1sr, 0xffffffff);      /* clear all */
 100
 101         /*--------------------------------------------------------------------
 102          * Setup other serial configuration
 103          *-------------------------------------------------------------------*/
 104         mfsdr(sdr_pci0, reg);
 105         mtsdr(sdr_pci0, 0x80000000 | reg);      /* PCI arbiter enabled */
 106         mtsdr(sdr_pfc0, 0x00003e00);    /* Pin function */
 107         mtsdr(sdr_pfc1, 0x00048000);    /* Pin function: UART0 has 4 pins */
 108
 109         /*clear tmrclk divisor */
 110         *(unsigned char *)(CONFIG_SYS_BCSR_BASE | 0x04) = 0x00;
 111
 112         /*enable ethernet */
 113         *(unsigned char *)(CONFIG_SYS_BCSR_BASE | 0x08) = 0xf0;
 114
 115 #ifdef CONFIG_440EP
 116         /*enable usb 1.1 fs device and remove usb 2.0 reset */
 117         *(unsigned char *)(CONFIG_SYS_BCSR_BASE | 0x09) = 0x00;
 118 #endif
 119
 120         /*get rid of flash write protect */
 121         *(unsigned char *)(CONFIG_SYS_BCSR_BASE | 0x07) = 0x00;
 122
 123         return 0;
 124 }
 125
 126 int misc_init_r (void)
 127 {
 128         uint pbcr;
 129         int size_val = 0;
 130
 131         /* Re-do sizing to get full correct info */
 132         mtdcr(ebccfga, pb0cr);
 133         pbcr = mfdcr(ebccfgd);
 134         switch (gd->bd->bi_flashsize) {
 135         case 1 << 20:
 136                 size_val = 0;
 137                 break;
 138         case 2 << 20:
 139                 size_val = 1;
 140                 break;
 141         case 4 << 20:
 142                 size_val = 2;
 143                 break;
 144         case 8 << 20:
 145                 size_val = 3;
 146                 break;
 147         case 16 << 20:
 148                 size_val = 4;
 149                 break;
 150         case 32 << 20:
 151                 size_val = 5;
 152                 break;
 153         case 64 << 20:
 154                 size_val = 6;
 155                 break;
 156         case 128 << 20:
 157                 size_val = 7;
 158                 break;
 159         }
 160         pbcr = (pbcr & 0x0001ffff) | gd->bd->bi_flashstart | (size_val << 17);
 161         mtdcr(ebccfga, pb0cr);
 162         mtdcr(ebccfgd, pbcr);
 163
 164         /* adjust flash start and offset */
 165         gd->bd->bi_flashstart = 0 - gd->bd->bi_flashsize;
 166         gd->bd->bi_flashoffset = 0;
 167
 168         /* Monitor protection ON by default */
 169         (void)flash_protect(FLAG_PROTECT_SET,
 170                             -CONFIG_SYS_MONITOR_LEN,
 171                             0xffffffff,
 172                             &flash_info[0]);
 173
 174         return 0;
 175 }
 176
 177 int checkboard(void)
 178 {
 179         char *s = getenv("serial#");
 180         u8 rev;
 181         u8 val;
 182
 183 #ifdef CONFIG_440EP
 184         printf("Board: Yosemite - AMCC PPC440EP Evaluation Board");
 185 #else
 186         printf("Board: Yellowstone - AMCC PPC440GR Evaluation Board");
 187 #endif
 188
 189         rev = in_8((void *)(CONFIG_SYS_BCSR_BASE + 0));
 190         val = in_8((void *)(CONFIG_SYS_BCSR_BASE + 5)) & CONFIG_SYS_BCSR5_PCI66EN;
 191         printf(", Rev. %X, PCI=%d MHz", rev, val ? 66 : 33);
 192
 193         if (s != NULL) {
 194                 puts(", serial# ");
 195                 puts(s);
 196         }
 197         putc('\n');
 198
 199         return (0);
 200 }
 201
 202 /*************************************************************************
 203  *  initdram -- doesn't use serial presence detect.
 204  *
 205  *  Assumes:    256 MB, ECC, non-registered
 206  *              PLB @ 133 MHz
 207  *
 208  ************************************************************************/
 209 #define NUM_TRIES 64
 210 #define NUM_READS 10
 211
 212 void sdram_tr1_set(int ram_address, int* tr1_value)
 213 {
 214         int i;
 215         int j, k;
 216         volatile unsigned int* ram_pointer =  (unsigned int*)ram_address;
 217         int first_good = -1, last_bad = 0x1ff;
 218
 219         unsigned long test[NUM_TRIES] = {
 220                 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
 221                 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
 222                 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
 223                 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
 224                 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
 225                 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
 226                 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
 227                 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
 228                 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
 229                 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
 230                 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
 231                 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
 232                 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
 233                 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
 234                 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
 235                 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55 };
 236
 237         /* go through all possible SDRAM0_TR1[RDCT] values */
 238         for (i=0; i<=0x1ff; i++) {
 239                 /* set the current value for TR1 */
 240                 mtsdram(mem_tr1, (0x80800800 | i));
 241
 242                 /* write values */
 243                 for (j=0; j<NUM_TRIES; j++) {
 244                         ram_pointer[j] = test[j];
 245
 246                         /* clear any cache at ram location */
 247                         __asm__("dcbf 0,%0": :"r" (&ram_pointer[j]));
 248                 }
 249
 250                 /* read values back */
 251                 for (j=0; j<NUM_TRIES; j++) {
 252                         for (k=0; k<NUM_READS; k++) {
 253                                 /* clear any cache at ram location */
 254                                 __asm__("dcbf 0,%0": :"r" (&ram_pointer[j]));
 255
 256                                 if (ram_pointer[j] != test[j])
 257                                         break;
 258                         }
 259
 260                         /* read error */
 261                         if (k != NUM_READS) {
 262                                 break;
 263                         }
 264                 }
 265
 266                 /* we have a SDRAM0_TR1[RDCT] that is part of the window */
 267                 if (j == NUM_TRIES) {
 268                         if (first_good == -1)
 269                                 first_good = i;         /* found beginning of window */
 270                 } else { /* bad read */
 271                         /* if we have not had a good read then don't care */
 272                         if(first_good != -1) {
 273                                 /* first failure after a good read */
 274                                 last_bad = i-1;
 275                                 break;
 276                         }
 277                 }
 278         }
 279
 280         /* return the current value for TR1 */
 281         *tr1_value = (first_good + last_bad) / 2;
 282 }
 283
 284 phys_size_t initdram(int board)
 285 {
 286         register uint reg;
 287         int tr1_bank1, tr1_bank2;
 288
 289         /*--------------------------------------------------------------------
 290          * Setup some default
 291          *------------------------------------------------------------------*/
 292         mtsdram(mem_uabba, 0x00000000); /* ubba=0 (default)             */
 293         mtsdram(mem_slio, 0x00000000);  /* rdre=0 wrre=0 rarw=0         */
 294         mtsdram(mem_devopt, 0x00000000);        /* dll=0 ds=0 (normal)          */
 295         mtsdram(mem_clktr, 0x40000000); /* ?? */
 296         mtsdram(mem_wddctr, 0x40000000);        /* ?? */
 297
 298         /*clear this first, if the DDR is enabled by a debugger
 299           then you can not make changes. */
 300         mtsdram(mem_cfg0, 0x00000000);  /* Disable EEC */
 301
 302         /*--------------------------------------------------------------------
 303          * Setup for board-specific specific mem
 304          *------------------------------------------------------------------*/
 305         /*
 306          * Following for CAS Latency = 2.5 @ 133 MHz PLB
 307          */
 308         mtsdram(mem_b0cr, 0x000a4001);  /* SDBA=0x000 128MB, Mode 3, enabled */
 309         mtsdram(mem_b1cr, 0x080a4001);  /* SDBA=0x080 128MB, Mode 3, enabled */
 310
 311         mtsdram(mem_tr0, 0x410a4012);   /* ?? */
 312         mtsdram(mem_rtr, 0x04080000);   /* ?? */
 313         mtsdram(mem_cfg1, 0x00000000);  /* Self-refresh exit, disable PM    */
 314         mtsdram(mem_cfg0, 0x30000000);  /* Disable EEC */
 315         udelay(400);            /* Delay 200 usecs (min)            */
 316
 317         /*--------------------------------------------------------------------
 318          * Enable the controller, then wait for DCEN to complete
 319          *------------------------------------------------------------------*/
 320         mtsdram(mem_cfg0, 0x80000000);  /* Enable */
 321
 322         for (;;) {
 323                 mfsdram(mem_mcsts, reg);
 324                 if (reg & 0x80000000)
 325                         break;
 326         }
 327
 328         sdram_tr1_set(0x00000000, &tr1_bank1);
 329         sdram_tr1_set(0x08000000, &tr1_bank2);
 330         mtsdram(mem_tr1, (((tr1_bank1+tr1_bank2)/2) | 0x80800800));
 331
 332         return CONFIG_SYS_SDRAM_BANKS * (CONFIG_SYS_KBYTES_SDRAM * 1024);       /* return bytes */
 333 }
 334
 335 /*************************************************************************
 336  *  pci_pre_init
 337  *
 338  *  This routine is called just prior to registering the hose and gives
 339  *  the board the opportunity to check things. Returning a value of zero
 340  *  indicates that things are bad & PCI initialization should be aborted.
 341  *
 342  *      Different boards may wish to customize the pci controller structure
 343  *      (add regions, override default access routines, etc) or perform
 344  *      certain pre-initialization actions.
 345  *
 346  ************************************************************************/
 347 #if defined(CONFIG_PCI)
 348 int pci_pre_init(struct pci_controller *hose)
 349 {
 350         unsigned long addr;
 351
 352         /*-------------------------------------------------------------------------+
 353           | Set priority for all PLB3 devices to 0.
 354           | Set PLB3 arbiter to fair mode.
 355           +-------------------------------------------------------------------------*/
 356         mfsdr(sdr_amp1, addr);
 357         mtsdr(sdr_amp1, (addr & 0x000000FF) | 0x0000FF00);
 358         addr = mfdcr(plb3_acr);
 359         mtdcr(plb3_acr, addr | 0x80000000);
 360
 361         /*-------------------------------------------------------------------------+
 362           | Set priority for all PLB4 devices to 0.
 363           +-------------------------------------------------------------------------*/
 364         mfsdr(sdr_amp0, addr);
 365         mtsdr(sdr_amp0, (addr & 0x000000FF) | 0x0000FF00);
 366         addr = mfdcr(plb4_acr) | 0xa0000000;    /* Was 0x8---- */
 367         mtdcr(plb4_acr, addr);
 368
 369         /*-------------------------------------------------------------------------+
 370           | Set Nebula PLB4 arbiter to fair mode.
 371           +-------------------------------------------------------------------------*/
 372         /* Segment0 */
 373         addr = (mfdcr(plb0_acr) & ~plb0_acr_ppm_mask) | plb0_acr_ppm_fair;
 374         addr = (addr & ~plb0_acr_hbu_mask) | plb0_acr_hbu_enabled;
 375         addr = (addr & ~plb0_acr_rdp_mask) | plb0_acr_rdp_4deep;
 376         addr = (addr & ~plb0_acr_wrp_mask) | plb0_acr_wrp_2deep;
 377         mtdcr(plb0_acr, addr);
 378
 379         /* Segment1 */
 380         addr = (mfdcr(plb1_acr) & ~plb1_acr_ppm_mask) | plb1_acr_ppm_fair;
 381         addr = (addr & ~plb1_acr_hbu_mask) | plb1_acr_hbu_enabled;
 382         addr = (addr & ~plb1_acr_rdp_mask) | plb1_acr_rdp_4deep;
 383         addr = (addr & ~plb1_acr_wrp_mask) | plb1_acr_wrp_2deep;
 384         mtdcr(plb1_acr, addr);
 385
 386         return 1;
 387 }
 388 #endif  /* defined(CONFIG_PCI) */
 389
 390 /*************************************************************************
 391  *  pci_target_init
 392  *
 393  *      The bootstrap configuration provides default settings for the pci
 394  *      inbound map (PIM). But the bootstrap config choices are limited and
 395  *      may not be sufficient for a given board.
 396  *
 397  ************************************************************************/
 398 #if defined(CONFIG_PCI) && defined(CONFIG_SYS_PCI_TARGET_INIT)
 399 void pci_target_init(struct pci_controller *hose)
 400 {
 401         /*--------------------------------------------------------------------------+
 402          * Set up Direct MMIO registers
 403          *--------------------------------------------------------------------------*/
 404         /*--------------------------------------------------------------------------+
 405           | PowerPC440 EP PCI Master configuration.
 406           | Map one 1Gig range of PLB/processor addresses to PCI memory space.
 407           |   PLB address 0xA0000000-0xDFFFFFFF ==> PCI address 0xA0000000-0xDFFFFFFF
 408           |   Use byte reversed out routines to handle endianess.
 409           | Make this region non-prefetchable.
 410           +--------------------------------------------------------------------------*/
 411         out32r(PCIX0_PMM0MA, 0x00000000);       /* PMM0 Mask/Attribute - disabled b4 setting */
 412         out32r(PCIX0_PMM0LA, CONFIG_SYS_PCI_MEMBASE);   /* PMM0 Local Address */
 413         out32r(PCIX0_PMM0PCILA, CONFIG_SYS_PCI_MEMBASE);        /* PMM0 PCI Low Address */
 414         out32r(PCIX0_PMM0PCIHA, 0x00000000);    /* PMM0 PCI High Address */
 415         out32r(PCIX0_PMM0MA, 0xE0000001);       /* 512M + No prefetching, and enable region */
 416
 417         out32r(PCIX0_PMM1MA, 0x00000000);       /* PMM0 Mask/Attribute - disabled b4 setting */
 418         out32r(PCIX0_PMM1LA, CONFIG_SYS_PCI_MEMBASE2);  /* PMM0 Local Address */
 419         out32r(PCIX0_PMM1PCILA, CONFIG_SYS_PCI_MEMBASE2);       /* PMM0 PCI Low Address */
 420         out32r(PCIX0_PMM1PCIHA, 0x00000000);    /* PMM0 PCI High Address */
 421         out32r(PCIX0_PMM1MA, 0xE0000001);       /* 512M + No prefetching, and enable region */
 422
 423         out32r(PCIX0_PTM1MS, 0x00000001);       /* Memory Size/Attribute */
 424         out32r(PCIX0_PTM1LA, 0);        /* Local Addr. Reg */
 425         out32r(PCIX0_PTM2MS, 0);        /* Memory Size/Attribute */
 426         out32r(PCIX0_PTM2LA, 0);        /* Local Addr. Reg */
 427
 428         /*--------------------------------------------------------------------------+
 429          * Set up Configuration registers
 430          *--------------------------------------------------------------------------*/
 431
 432         /* Program the board's subsystem id/vendor id */
 433         pci_write_config_word(0, PCI_SUBSYSTEM_VENDOR_ID,
 434                               CONFIG_SYS_PCI_SUBSYS_VENDORID);
 435         pci_write_config_word(0, PCI_SUBSYSTEM_ID, CONFIG_SYS_PCI_SUBSYS_ID);
 436
 437         /* Configure command register as bus master */
 438         pci_write_config_word(0, PCI_COMMAND, PCI_COMMAND_MASTER);
 439
 440         /* 240nS PCI clock */
 441         pci_write_config_word(0, PCI_LATENCY_TIMER, 1);
 442
 443         /* No error reporting */
 444         pci_write_config_word(0, PCI_ERREN, 0);
 445
 446         pci_write_config_dword(0, PCI_BRDGOPT2, 0x00000101);
 447
 448 }
 449 #endif                          /* defined(CONFIG_PCI) && defined(CONFIG_SYS_PCI_TARGET_INIT) */
 450
 451 /*************************************************************************
 452  *  pci_master_init
 453  *
 454  ************************************************************************/
 455 #if defined(CONFIG_PCI) && defined(CONFIG_SYS_PCI_MASTER_INIT)
 456 void pci_master_init(struct pci_controller *hose)
 457 {
 458         unsigned short temp_short;
 459
 460         /*--------------------------------------------------------------------------+
 461           | Write the PowerPC440 EP PCI Configuration regs.
 462           |   Enable PowerPC440 EP to be a master on the PCI bus (PMM).
 463           |   Enable PowerPC440 EP to act as a PCI memory target (PTM).
 464           +--------------------------------------------------------------------------*/
 465         pci_read_config_word(0, PCI_COMMAND, &temp_short);
 466         pci_write_config_word(0, PCI_COMMAND,
 467                               temp_short | PCI_COMMAND_MASTER |
 468                               PCI_COMMAND_MEMORY);
 469 }
 470 #endif                          /* defined(CONFIG_PCI) && defined(CONFIG_SYS_PCI_MASTER_INIT) */
 471
 472 /*************************************************************************
 473  *  is_pci_host
 474  *
 475  *      This routine is called to determine if a pci scan should be
 476  *      performed. With various hardware environments (especially cPCI and
 477  *      PPMC) it's insufficient to depend on the state of the arbiter enable
 478  *      bit in the strap register, or generic host/adapter assumptions.
 479  *
 480  *      Rather than hard-code a bad assumption in the general 440 code, the
 481  *      440 pci code requires the board to decide at runtime.
 482  *
 483  *      Return 0 for adapter mode, non-zero for host (monarch) mode.
 484  *
 485  *
 486  ************************************************************************/
 487 #if defined(CONFIG_PCI)
 488 int is_pci_host(struct pci_controller *hose)
 489 {
 490         /* Bamboo is always configured as host. */
 491         return (1);
 492 }
 493 #endif                          /* defined(CONFIG_PCI) */
 494
 495 /*************************************************************************
 496  *  hw_watchdog_reset
 497  *
 498  *      This routine is called to reset (keep alive) the watchdog timer
 499  *
 500  ************************************************************************/
 501 #if defined(CONFIG_HW_WATCHDOG)
 502 void hw_watchdog_reset(void)
 503 {
 504
 505 }
 506 #endif
 507
 508 void board_reset(void)
 509 {
 510         /* give reset to BCSR */
 511         *(unsigned char *)(CONFIG_SYS_BCSR_BASE | 0x06) = 0x09;
 512 }