board/amcc/walnut/walnut.c

   1 /*
   2  * (C) Copyright 2000-2005
   3  * Wolfgang Denk, DENX Software Engineering, wd@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 <asm/processor.h>
  26 #include <spd_sdram.h>
  27
  28 int board_early_init_f(void)
  29 {
  30         /*-------------------------------------------------------------------------+
  31           | Interrupt controller setup for the Walnut/Sycamore board.
  32           | Note: IRQ 0-15  405GP internally generated; active high; level sensitive
  33           |       IRQ 16    405GP internally generated; active low; level sensitive
  34           |       IRQ 17-24 RESERVED
  35           |       IRQ 25 (EXT IRQ 0) FPGA; active high; level sensitive
  36           |       IRQ 26 (EXT IRQ 1) SMI; active high; level sensitive
  37           |       IRQ 27 (EXT IRQ 2) Not Used
  38           |       IRQ 28 (EXT IRQ 3) PCI SLOT 3; active low; level sensitive
  39           |       IRQ 29 (EXT IRQ 4) PCI SLOT 2; active low; level sensitive
  40           |       IRQ 30 (EXT IRQ 5) PCI SLOT 1; active low; level sensitive
  41           |       IRQ 31 (EXT IRQ 6) PCI SLOT 0; active low; level sensitive
  42           | Note for Walnut board:
  43           |       An interrupt taken for the FPGA (IRQ 25) indicates that either
  44           |       the Mouse, Keyboard, IRDA, or External Expansion caused the
  45           |       interrupt. The FPGA must be read to determine which device
  46           |       caused the interrupt. The default setting of the FPGA clears
  47           |
  48           +-------------------------------------------------------------------------*/
  49
  50         mtdcr(UIC0SR, 0xFFFFFFFF);      /* clear all ints */
  51         mtdcr(UIC0ER, 0x00000000);      /* disable all ints */
  52         mtdcr(UIC0CR, 0x00000020);      /* set all but FPGA SMI to be non-critical */
  53         mtdcr(UIC0PR, 0xFFFFFFE0);      /* set int polarities */
  54         mtdcr(UIC0TR, 0x10000000);      /* set int trigger levels */
  55         mtdcr(UIC0VCR, 0x00000001);     /* set vect base=0,INT0 highest priority */
  56         mtdcr(UIC0SR, 0xFFFFFFFF);      /* clear all ints */
  57
  58         /* set UART1 control to select CTS/RTS */
  59 #define FPGA_BRDC       0xF0300004
  60         *(volatile char *)(FPGA_BRDC) |= 0x1;
  61
  62         return 0;
  63 }
  64
  65 /*
  66  * Check Board Identity:
  67  */
  68 int checkboard(void)
  69 {
  70         char *s = getenv("serial#");
  71         uint pvr = get_pvr();
  72
  73         if (pvr == PVR_405GPR_RB) {
  74                 puts("Board: Sycamore - AMCC PPC405GPr Evaluation Board");
  75         } else {
  76                 puts("Board: Walnut - AMCC PPC405GP Evaluation Board");
  77         }
  78
  79         if (s != NULL) {
  80                 puts(", serial# ");
  81                 puts(s);
  82         }
  83         putc('\n');
  84
  85         return (0);
  86 }
  87
  88 /*
  89  * initdram(int board_type) reads EEPROM via I2c. EEPROM contains all of
  90  * the necessary info for SDRAM controller configuration
  91  */
  92 phys_size_t initdram(int board_type)
  93 {
  94         return spd_sdram();
  95 }