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/*
* Author :
* Vaibhav Hiremath <hvaibhav@ti.com>
*
* Based on mem.c and sdrc.c
*
* Copyright (C) 2010
* Texas Instruments Incorporated - http://www.ti.com/
*
* 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 <asm/io.h>
#include <asm/arch/mem.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/emif4.h>
extern omap3_sysinfo sysinfo;
static emif4_t *emif4_base = (emif4_t *)OMAP34XX_SDRC_BASE;
/*
* is_mem_sdr -
* - Return 1 if mem type in use is SDR
*/
u32 is_mem_sdr(void)
{
return 0;
}
/*
* get_sdr_cs_size -
* - Get size of chip select 0/1
*/
u32 get_sdr_cs_size(u32 cs)
{
u32 size;
/* TODO: Calculate the size based on EMIF4 configuration */
size = CONFIG_SYS_CS0_SIZE;
return size;
}
/*
* get_sdr_cs_offset -
* - Get offset of cs from cs0 start
*/
u32 get_sdr_cs_offset(u32 cs)
{
u32 offset = 0;
return offset;
}
/*
* do_emif4_init -
* - Init the emif4 module for DDR access
* - Early init routines, called from flash or SRAM.
*/
void do_emif4_init(void)
{
unsigned int regval;
/* Set the DDR PHY parameters in PHY ctrl registers */
regval = (EMIF4_DDR1_READ_LAT | EMIF4_DDR1_PWRDN_DIS |
EMIF4_DDR1_EXT_STRB_DIS);
writel(regval, &emif4_base->ddr_phyctrl1);
writel(regval, &emif4_base->ddr_phyctrl1_shdw);
writel(0, &emif4_base->ddr_phyctrl2);
/* Reset the DDR PHY and wait till completed */
regval = readl(&emif4_base->sdram_iodft_tlgc);
regval |= (1<<10);
writel(regval, &emif4_base->sdram_iodft_tlgc);
/*Wait till that bit clears*/
while ((readl(&emif4_base->sdram_iodft_tlgc) & (1<<10)) == 0x1);
/*Re-verify the DDR PHY status*/
while ((readl(&emif4_base->sdram_sts) & (1<<2)) == 0x0);
regval |= (1<<0);
writel(regval, &emif4_base->sdram_iodft_tlgc);
/* Set SDR timing registers */
regval = (EMIF4_TIM1_T_WTR | EMIF4_TIM1_T_RRD |
EMIF4_TIM1_T_RC | EMIF4_TIM1_T_RAS |
EMIF4_TIM1_T_WR | EMIF4_TIM1_T_RCD |
EMIF4_TIM1_T_RP);
writel(regval, &emif4_base->sdram_time1);
writel(regval, &emif4_base->sdram_time1_shdw);
regval = (EMIF4_TIM2_T_CKE | EMIF4_TIM2_T_RTP |
EMIF4_TIM2_T_XSRD | EMIF4_TIM2_T_XSNR |
EMIF4_TIM2_T_ODT | EMIF4_TIM2_T_XP);
writel(regval, &emif4_base->sdram_time2);
writel(regval, &emif4_base->sdram_time2_shdw);
regval = (EMIF4_TIM3_T_RAS_MAX | EMIF4_TIM3_T_RFC);
writel(regval, &emif4_base->sdram_time3);
writel(regval, &emif4_base->sdram_time3_shdw);
/* Set the PWR control register */
regval = (EMIF4_PWR_PM_TIM | EMIF4_PWR_LP_MODE |
EMIF4_PWR_DPD_DIS | EMIF4_PWR_IDLE_MODE);
writel(regval, &emif4_base->sdram_pwr_mgmt);
writel(regval, &emif4_base->sdram_pwr_mgmt_shdw);
/* Set the DDR refresh rate control register */
regval = (EMIF4_REFRESH_RATE | EMIF4_INITREF_DIS);
writel(regval, &emif4_base->sdram_refresh_ctrl);
writel(regval, &emif4_base->sdram_refresh_ctrl_shdw);
/* set the SDRAM configuration register */
regval = (EMIF4_CFG_PGSIZE | EMIF4_CFG_EBANK |
EMIF4_CFG_IBANK | EMIF4_CFG_ROWSIZE |
EMIF4_CFG_CL | EMIF4_CFG_NARROW_MD |
EMIF4_CFG_SDR_DRV | EMIF4_CFG_DDR_DIS_DLL |
EMIF4_CFG_DDR2_DDQS | EMIF4_CFG_DDR_TERM |
EMIF4_CFG_IBANK_POS | EMIF4_CFG_SDRAM_TYP);
writel(regval, &emif4_base->sdram_config);
}
/*
* dram_init -
* - Sets uboots idea of sdram size
*/
int dram_init(void)
{
DECLARE_GLOBAL_DATA_PTR;
unsigned int size0 = 0, size1 = 0;
size0 = get_sdr_cs_size(CS0);
/*
* If a second bank of DDR is attached to CS1 this is
* where it can be started. Early init code will init
* memory on CS0.
*/
if ((sysinfo.mtype == DDR_COMBO) || (sysinfo.mtype == DDR_STACKED))
size1 = get_sdr_cs_size(CS1);
gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
gd->bd->bi_dram[0].size = size0;
gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1);
gd->bd->bi_dram[1].size = size1;
return 0;
}
/*
* mem_init() -
* - Initialize memory subsystem
*/
void mem_init(void)
{
do_emif4_init();
}
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