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https://github.com/u-boot/u-boot.git
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127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
#include <common.h>
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#include <asm/u-boot.h>
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#include <asm/processor.h>
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#include "exbitgen.h"
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void sdram_init(void);
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/* ************************************************************************ */
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int board_early_init_f (void)
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/* ------------------------------------------------------------------------ --
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* Purpose :
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* Remarks :
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* Restrictions:
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* See also :
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* Example :
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* ************************************************************************ */
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{
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unsigned long i;
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/*-------------------------------------------------------------------------+
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| Interrupt controller setup for the Walnut board.
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| Note: IRQ 0-15 405GP internally generated; active high; level sensitive
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| IRQ 16 405GP internally generated; active low; level sensitive
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| IRQ 17-24 RESERVED
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| IRQ 25 (EXT IRQ 0) FPGA; active high; level sensitive
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| IRQ 26 (EXT IRQ 1) SMI; active high; level sensitive
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| IRQ 27 (EXT IRQ 2) Not Used
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| IRQ 28 (EXT IRQ 3) PCI SLOT 3; active low; level sensitive
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| IRQ 29 (EXT IRQ 4) PCI SLOT 2; active low; level sensitive
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| IRQ 30 (EXT IRQ 5) PCI SLOT 1; active low; level sensitive
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| IRQ 31 (EXT IRQ 6) PCI SLOT 0; active low; level sensitive
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| Note for Walnut board:
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| An interrupt taken for the FPGA (IRQ 25) indicates that either
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| the Mouse, Keyboard, IRDA, or External Expansion caused the
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| interrupt. The FPGA must be read to determine which device
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| caused the interrupt. The default setting of the FPGA clears
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+-------------------------------------------------------------------------*/
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mtdcr (uicsr, 0xFFFFFFFF); /* clear all ints */
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mtdcr (uicer, 0x00000000); /* disable all ints */
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mtdcr (uiccr, 0x00000020); /* set all but FPGA SMI to be non-critical */
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mtdcr (uicpr, 0xFFFFFF90); /* set int polarities */
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mtdcr (uictr, 0x10000000); /* set int trigger levels */
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mtdcr (uicvcr, 0x00000001); /* set vect base=0,INT0 highest priority */
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mtdcr (uicsr, 0xFFFFFFFF); /* clear all ints */
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/* Perform reset of PHY connected to PPC via register in CPLD */
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out8 (PHY_CTRL_ADDR, 0x2e); /* activate nRESET,FDX,F100,ANEN, enable output */
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for (i = 0; i < 10000000; i++) {
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;
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}
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out8 (PHY_CTRL_ADDR, 0x2f); /* deactivate nRESET */
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return 0;
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}
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/* ************************************************************************ */
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int checkboard (void)
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/* ------------------------------------------------------------------------ --
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* Purpose :
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* Remarks :
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* Restrictions:
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* See also :
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* Example :
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* ************************************************************************ */
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{
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printf ("Exbit H/W id: %d\n", in8 (HW_ID_ADDR));
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return (0);
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}
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/* ************************************************************************ */
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phys_size_t initdram (int board_type)
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/* ------------------------------------------------------------------------ --
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* Purpose : Determines size of mounted DRAM.
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* Remarks : Size is determined by reading SDRAM configuration registers as
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* set up by sdram_init.
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* Restrictions:
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* See also :
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* Example :
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* ************************************************************************ */
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{
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ulong tot_size;
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ulong bank_size;
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ulong tmp;
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/*
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* ToDo: Move the asm init routine sdram_init() to this C file,
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* or even better use some common ppc4xx code available
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* in cpu/ppc4xx
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*/
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sdram_init();
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tot_size = 0;
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mtdcr (memcfga, mem_mb0cf);
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tmp = mfdcr (memcfgd);
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if (tmp & 0x00000001) {
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bank_size = 0x00400000 << ((tmp >> 17) & 0x7);
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tot_size += bank_size;
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}
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mtdcr (memcfga, mem_mb1cf);
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tmp = mfdcr (memcfgd);
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if (tmp & 0x00000001) {
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bank_size = 0x00400000 << ((tmp >> 17) & 0x7);
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tot_size += bank_size;
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}
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mtdcr (memcfga, mem_mb2cf);
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tmp = mfdcr (memcfgd);
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if (tmp & 0x00000001) {
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bank_size = 0x00400000 << ((tmp >> 17) & 0x7);
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tot_size += bank_size;
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}
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mtdcr (memcfga, mem_mb3cf);
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tmp = mfdcr (memcfgd);
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if (tmp & 0x00000001) {
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bank_size = 0x00400000 << ((tmp >> 17) & 0x7);
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tot_size += bank_size;
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}
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return tot_size;
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}
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