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/*
* Copyright (C) Freescale Semiconductor, Inc. 2006-2007
* Copyright (C) Sheldon Instruments, Inc. 2008
*
* Author: Ron Madrid <info@sheldoninst.com>
*
* (C) Copyright 2006
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* 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 <mpc83xx.h>
#include <spd_sdram.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/mmu.h>
DECLARE_GLOBAL_DATA_PTR;
static long fixed_sdram(void);
#if defined(CONFIG_NAND_SPL)
void si_wait_i2c(void)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
while (!(__raw_readb(&im->i2c[0].sr) & 0x02))
;
__raw_writeb(0x00, &im->i2c[0].sr);
sync();
return;
}
void si_read_i2c(u32 lbyte, int count, u8 *buffer)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
u32 i;
u8 chip = 0x50 << 1; /* boot sequencer I2C */
u32 ubyte = (lbyte & 0xff00) >> 8;
lbyte &= 0xff;
/*
* Set up controller
*/
__raw_writeb(0x3f, &im->i2c[0].fdr);
__raw_writeb(0x00, &im->i2c[0].adr);
__raw_writeb(0x00, &im->i2c[0].sr);
__raw_writeb(0x00, &im->i2c[0].dr);
while (__raw_readb(&im->i2c[0].sr) & 0x20)
;
/*
* Writing address to device
*/
__raw_writeb(0xb0, &im->i2c[0].cr);
sync();
__raw_writeb(chip, &im->i2c[0].dr);
si_wait_i2c();
__raw_writeb(0xb0, &im->i2c[0].cr);
sync();
__raw_writeb(ubyte, &im->i2c[0].dr);
si_wait_i2c();
__raw_writeb(lbyte, &im->i2c[0].dr);
si_wait_i2c();
__raw_writeb(0xb4, &im->i2c[0].cr);
sync();
__raw_writeb(chip + 1, &im->i2c[0].dr);
si_wait_i2c();
__raw_writeb(0xa0, &im->i2c[0].cr);
sync();
/*
* Dummy read
*/
__raw_readb(&im->i2c[0].dr);
si_wait_i2c();
/*
* Read actual data
*/
for (i = 0; i < count; i++)
{
if (i == (count - 2)) /* Reached next to last byte, No ACK */
__raw_writeb(0xa8, &im->i2c[0].cr);
if (i == (count - 1)) /* Reached last byte, STOP */
__raw_writeb(0x88, &im->i2c[0].cr);
/* Read byte of data */
buffer[i] = __raw_readb(&im->i2c[0].dr);
if (i == (count - 1))
break;
si_wait_i2c();
}
return;
}
#endif /* CONFIG_NAND_SPL */
phys_size_t initdram(int board_type)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
volatile fsl_lbus_t *lbc= &im->lbus;
u32 msize;
if ((__raw_readl(&im->sysconf.immrbar) & IMMRBAR_BASE_ADDR) != (u32) im)
return -1;
/* DDR SDRAM - Main SODIMM */
__raw_writel(CONFIG_SYS_DDR_BASE & LAWBAR_BAR, &im->sysconf.ddrlaw[0].bar);
msize = fixed_sdram();
/* Local Bus setup lbcr and mrtpr */
__raw_writel(CONFIG_SYS_LBC_LBCR, &lbc->lbcr);
__raw_writel(CONFIG_SYS_LBC_MRTPR, &lbc->mrtpr);
sync();
/* return total bus SDRAM size(bytes) -- DDR */
return (msize * 1024 * 1024);
}
/*************************************************************************
* fixed sdram init -- reads values from boot sequencer I2C
************************************************************************/
static long fixed_sdram(void)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
u32 msizelog2, msize = 1;
#if defined(CONFIG_NAND_SPL)
u32 i;
const u8 bytecount = 135;
u8 buffer[bytecount];
u32 addr, data;
si_read_i2c(0, bytecount, buffer);
for (i = 18; i < bytecount; i += 7){
addr = (u32)buffer[i];
addr <<= 8;
addr |= (u32)buffer[i + 1];
addr <<= 2;
data = (u32)buffer[i + 2];
data <<= 8;
data |= (u32)buffer[i + 3];
data <<= 8;
data |= (u32)buffer[i + 4];
data <<= 8;
data |= (u32)buffer[i + 5];
__raw_writel(data, (u32 *)(CONFIG_SYS_IMMR + addr));
}
sync();
/* enable DDR controller */
__raw_writel((__raw_readl(&im->ddr.sdram_cfg) | SDRAM_CFG_MEM_EN), &im->ddr.sdram_cfg);
#endif /* (CONFIG_NAND_SPL) */
msizelog2 = ((__raw_readl(&im->sysconf.ddrlaw[0].ar) & LAWAR_SIZE) + 1);
msize <<= (msizelog2 - 20);
return msize;
}
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