ocotea.c

gumstiz u-boot loader in linux

/*
 *  Copyright (C) 2004 [e-mail]
 *
 * (C) Copyright 2005
 * Stefan Roese, DENX Software Engineering, [e-mail].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */


#include <common.h>
#include "ocotea.h"
#include <asm/processor.h>
#include <spd_sdram.h>
#include <ppc4xx_enet.h>

#define BOOT_SMALL_FLASH	32	/* 00100000 */
#define FLASH_ONBD_N		2	/* 00000010 */
#define FLASH_SRAM_SEL		1	/* 00000001 */

long int fixed_sdram (void);
void fpga_init (void);

int board_early_init_f (void)
{
	unsigned long mfr;
	unsigned char *fpga_base = (unsigned char *) CFG_FPGA_BASE;
	unsigned char switch_status;
	unsigned long cs0_base;
	unsigned long cs0_size;
	unsigned long cs0_twt;
	unsigned long cs2_base;
	unsigned long cs2_size;
	unsigned long cs2_twt;

	/*-------------------------------------------------------------------------+
	  | Initialize EBC CONFIG
	  +-------------------------------------------------------------------------*/
	mtebc(xbcfg, EBC_CFG_LE_UNLOCK |
	      EBC_CFG_PTD_ENABLE | EBC_CFG_RTC_64PERCLK |
	      EBC_CFG_ATC_PREVIOUS | EBC_CFG_DTC_PREVIOUS |
	      EBC_CFG_CTC_PREVIOUS | EBC_CFG_EMC_NONDEFAULT |
	      EBC_CFG_PME_DISABLE | EBC_CFG_PR_32);

	/*-------------------------------------------------------------------------+
	  | FPGA. Initialize bank 7 with default values.
	  +-------------------------------------------------------------------------*/
	mtebc(pb7ap, EBC_BXAP_BME_DISABLED|EBC_BXAP_TWT_ENCODE(7)|
	      EBC_BXAP_BCE_DISABLE|
	      EBC_BXAP_CSN_ENCODE(1)|EBC_BXAP_OEN_ENCODE(1)|
	      EBC_BXAP_WBN_ENCODE(1)|EBC_BXAP_WBF_ENCODE(1)|
	      EBC_BXAP_TH_ENCODE(1)|EBC_BXAP_RE_DISABLED|
	      EBC_BXAP_BEM_WRITEONLY|
	      EBC_BXAP_PEN_DISABLED);
	mtebc(pb7cr, EBC_BXCR_BAS_ENCODE(0x48300000)|
	      EBC_BXCR_BS_1MB|EBC_BXCR_BU_RW|EBC_BXCR_BW_8BIT);

	/* read FPGA base register FPGA_REG0 */
	switch_status = *fpga_base;

	if (switch_status & 0x40) {
		cs0_base = 0xFFE00000;
		cs0_size = EBC_BXCR_BS_2MB;
		cs0_twt = 8;
		cs2_base = 0xFF800000;
		cs2_size = EBC_BXCR_BS_4MB;
		cs2_twt = 10;
	} else {
		cs0_base = 0xFFC00000;
		cs0_size = EBC_BXCR_BS_4MB;
		cs0_twt = 10;
		cs2_base = 0xFF800000;
		cs2_size = EBC_BXCR_BS_2MB;
		cs2_twt = 8;
	}

	/*-------------------------------------------------------------------------+
	  | 1 MB FLASH / 1 MB SRAM. Initialize bank 0 with default values.
	  +-------------------------------------------------------------------------*/
	mtebc(pb0ap, EBC_BXAP_BME_DISABLED|EBC_BXAP_TWT_ENCODE(cs0_twt)|
	      EBC_BXAP_BCE_DISABLE|
	      EBC_BXAP_CSN_ENCODE(1)|EBC_BXAP_OEN_ENCODE(1)|
	      EBC_BXAP_WBN_ENCODE(1)|EBC_BXAP_WBF_ENCODE(1)|
	      EBC_BXAP_TH_ENCODE(1)|EBC_BXAP_RE_DISABLED|
	      EBC_BXAP_BEM_WRITEONLY|
	      EBC_BXAP_PEN_DISABLED);
	mtebc(pb0cr, EBC_BXCR_BAS_ENCODE(cs0_base)|
	      cs0_size|EBC_BXCR_BU_RW|EBC_BXCR_BW_8BIT);

	/*-------------------------------------------------------------------------+
	  | 8KB NVRAM/RTC. Initialize bank 1 with default values.
	  +-------------------------------------------------------------------------*/
	mtebc(pb1ap, EBC_BXAP_BME_DISABLED|EBC_BXAP_TWT_ENCODE(10)|
	      EBC_BXAP_BCE_DISABLE|
	      EBC_BXAP_CSN_ENCODE(1)|EBC_BXAP_OEN_ENCODE(1)|
	      EBC_BXAP_WBN_ENCODE(1)|EBC_BXAP_WBF_ENCODE(1)|
	      EBC_BXAP_TH_ENCODE(1)|EBC_BXAP_RE_DISABLED|
	      EBC_BXAP_BEM_WRITEONLY|
	      EBC_BXAP_PEN_DISABLED);
	mtebc(pb1cr, EBC_BXCR_BAS_ENCODE(0x48000000)|
	      EBC_BXCR_BS_1MB|EBC_BXCR_BU_RW|EBC_BXCR_BW_8BIT);

	/*-------------------------------------------------------------------------+
	  | 4 MB FLASH. Initialize bank 2 with default values.
	  +-------------------------------------------------------------------------*/
	mtebc(pb2ap, EBC_BXAP_BME_DISABLED|EBC_BXAP_TWT_ENCODE(cs2_twt)|
	      EBC_BXAP_BCE_DISABLE|
	      EBC_BXAP_CSN_ENCODE(1)|EBC_BXAP_OEN_ENCODE(1)|
	      EBC_BXAP_WBN_ENCODE(1)|EBC_BXAP_WBF_ENCODE(1)|
	      EBC_BXAP_TH_ENCODE(1)|EBC_BXAP_RE_DISABLED|
	      EBC_BXAP_BEM_WRITEONLY|
	      EBC_BXAP_PEN_DISABLED);
	mtebc(pb2cr, EBC_BXCR_BAS_ENCODE(cs2_base)|
	      cs2_size|EBC_BXCR_BU_RW|EBC_BXCR_BW_8BIT);

	/*-------------------------------------------------------------------------+
	  | FPGA. Initialize bank 7 with default values.
	  +-------------------------------------------------------------------------*/
	mtebc(pb7ap, EBC_BXAP_BME_DISABLED|EBC_BXAP_TWT_ENCODE(7)|
	      EBC_BXAP_BCE_DISABLE|
	      EBC_BXAP_CSN_ENCODE(1)|EBC_BXAP_OEN_ENCODE(1)|
	      EBC_BXAP_WBN_ENCODE(1)|EBC_BXAP_WBF_ENCODE(1)|
	      EBC_BXAP_TH_ENCODE(1)|EBC_BXAP_RE_DISABLED|
	      EBC_BXAP_BEM_WRITEONLY|
	      EBC_BXAP_PEN_DISABLED);
	mtebc(pb7cr, EBC_BXCR_BAS_ENCODE(0x48300000)|
	      EBC_BXCR_BS_1MB|EBC_BXCR_BU_RW|EBC_BXCR_BW_8BIT);

	/*--------------------------------------------------------------------
	 * Setup the interrupt controller polarities, triggers, etc.
	 *-------------------------------------------------------------------*/
	mtdcr (uic0sr, 0xffffffff);	/* clear all */
	mtdcr (uic0er, 0x00000000);	/* disable all */
	mtdcr (uic0cr, 0x00000009);	/* SMI & UIC1 crit are critical */
	mtdcr (uic0pr, 0xfffffe13);	/* per ref-board manual */
	mtdcr (uic0tr, 0x01c00008);	/* per ref-board manual */
	mtdcr (uic0vr, 0x00000001);	/* int31 highest, base=0x000 */
	mtdcr (uic0sr, 0xffffffff);	/* clear all */

	mtdcr (uic1sr, 0xffffffff);	/* clear all */
	mtdcr (uic1er, 0x00000000);	/* disable all */
	mtdcr (uic1cr, 0x00000000);	/* all non-critical */
	mtdcr (uic1pr, 0xffffe0ff);	/* per ref-board manual */
	mtdcr (uic1tr, 0x00ffc000);	/* per ref-board manual */
	mtdcr (uic1vr, 0x00000001);	/* int31 highest, base=0x000 */
	mtdcr (uic1sr, 0xffffffff);	/* clear all */

	mtdcr (uic2sr, 0xffffffff);	/* clear all */
	mtdcr (uic2er, 0x00000000);	/* disable all */
	mtdcr (uic2cr, 0x00000000);	/* all non-critical */
	mtdcr (uic2pr, 0xffffffff);	/* per ref-board manual */
	mtdcr (uic2tr, 0x00ff8c0f);	/* per ref-board manual */
	mtdcr (uic2vr, 0x00000001);	/* int31 highest, base=0x000 */
	mtdcr (uic2sr, 0xffffffff);	/* clear all */

	mtdcr (uicb0sr, 0xfc000000); /* clear all */
	mtdcr (uicb0er, 0x00000000); /* disable all */
	mtdcr (uicb0cr, 0x00000000); /* all non-critical */
	mtdcr (uicb0pr, 0xfc000000); /* */
	mtdcr (uicb0tr, 0x00000000); /* */
	mtdcr (uicb0vr, 0x00000001); /* */
	mfsdr (sdr_mfr, mfr);
	mfr &= ~SDR0_MFR_ECS_MASK;
/*	mtsdr(sdr_mfr, mfr); */
	fpga_init();

	return 0;
}


int checkboard (void)
{
	char *s = getenv ("serial#");

	printf ("Board: Ocotea - AMCC PPC440GX Evaluation Board");
	if (s != NULL) {
		puts (", serial# ");
		puts (s);
	}
	putc ('\n');

	return (0);
}


long int initdram (int board_type)
{
	long dram_size = 0;

#if defined(CONFIG_SPD_EEPROM)
	dram_size = spd_sdram (0);
#else
	dram_size = fixed_sdram ();
#endif
	return dram_size;
}


#if defined(CFG_DRAM_TEST)
int testdram (void)
{
	uint *pstart = (uint *) 0x00000000;
	uint *pend = (uint *) 0x08000000;
	uint *p;

	for (p = pstart; p < pend; p++)
		*p = 0xaaaaaaaa;

	for (p = pstart; p < pend; p++) {
		if (*p != 0xaaaaaaaa) {
			printf ("SDRAM test fails at: %08x\n", (uint) p);
			return 1;
		}
	}

	for (p = pstart; p < pend; p++)
		*p = 0x55555555;

	for (p = pstart; p < pend; p++) {
		if (*p != 0x55555555) {
			printf ("SDRAM test fails at: %08x\n", (uint) p);
			return 1;
		}
	}
	return 0;
}
#endif

#if !defined(CONFIG_SPD_EEPROM)
/*************************************************************************
 *  fixed sdram init -- doesn't use serial presence detect.
 *
 *  Assumes:    128 MB, non-ECC, non-registered
 *              PLB @ 133 MHz
 *
 ************************************************************************/
long int fixed_sdram (void)
{
	uint reg;

	/*--------------------------------------------------------------------
	 * Setup some default
	 *------------------------------------------------------------------*/
	mtsdram (mem_uabba, 0x00000000);	/* ubba=0 (default)             */
	mtsdram (mem_slio, 0x00000000);		/* rdre=0 wrre=0 rarw=0         */
	mtsdram (mem_devopt, 0x00000000);	/* dll=0 ds=0 (normal)          */
	mtsdram (mem_wddctr, 0x00000000);	/* wrcp=0 dcd=0                 */
	mtsdram (mem_clktr, 0x40000000);	/* clkp=1 (90 deg wr) dcdt=0    */