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/*
* For clock initialization, see chapter 3 of the "MCIMX27 Multimedia
* Applications Processor Reference Manual, Rev. 0.2".
*
* (C) Copyright 2008 Eric Jarrige <eric.jarrige@armadeus.org>
* (C) Copyright 2009 Ilya Yanok <yanok@emcraft.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 <config.h>
#include <version.h>
#include <asm/macro.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/asm-offsets.h>
SOC_ESDCTL_BASE_W: .word IMX_ESD_BASE
SOC_SI_ID_REG_W: .word IMX_SYSTEM_CTL_BASE
SDRAM_ESDCFG_T1_W: .word SDRAM_ESDCFG_REGISTER_VAL(0)
SDRAM_ESDCFG_T2_W: .word SDRAM_ESDCFG_REGISTER_VAL(3)
SDRAM_PRECHARGE_CMD_W: .word (ESDCTL_SDE | ESDCTL_SMODE_PRECHARGE | \
ESDCTL_ROW13 | ESDCTL_COL10)
SDRAM_AUTOREF_CMD_W: .word (ESDCTL_SDE | ESDCTL_SMODE_AUTO_REF | \
ESDCTL_ROW13 | ESDCTL_COL10)
SDRAM_LOADMODE_CMD_W: .word (ESDCTL_SDE | ESDCTL_SMODE_LOAD_MODE | \
ESDCTL_ROW13 | ESDCTL_COL10)
SDRAM_NORMAL_CMD_W: .word SDRAM_ESDCTL_REGISTER_VAL
.macro init_aipi
/*
* setup AIPI1 and AIPI2
*/
write32 AIPI1_PSR0, AIPI1_PSR0_VAL
write32 AIPI1_PSR1, AIPI1_PSR1_VAL
write32 AIPI2_PSR0, AIPI2_PSR0_VAL
write32 AIPI2_PSR1, AIPI2_PSR1_VAL
.endm /* init_aipi */
.macro init_clock
ldr r0, =CSCR
/* disable MPLL/SPLL first */
ldr r1, [r0]
bic r1, r1, #(CSCR_MPEN|CSCR_SPEN)
str r1, [r0]
write32 MPCTL0, MPCTL0_VAL
write32 SPCTL0, SPCTL0_VAL
write32 CSCR, CSCR_VAL | CSCR_MPLL_RESTART | CSCR_SPLL_RESTART
/*
* add some delay here
*/
wait_timer 0x1000
/* peripheral clock divider */
write32 PCDR0, PCDR0_VAL
write32 PCDR1, PCDR1_VAL
/* Configure PCCR0 and PCCR1 */
write32 PCCR0, PCCR0_VAL
write32 PCCR1, PCCR1_VAL
.endm /* init_clock */
.macro sdram_init
ldr r0, SOC_ESDCTL_BASE_W
mov r2, #PHYS_SDRAM_1
/* Do initial reset */
mov r1, #ESDMISC_MDDR_DL_RST
str r1, [r0, #ESDMISC_ROF]
/* Hold for more than 200ns */
wait_timer 0x10000
/* Activate LPDDR iface */
mov r1, #ESDMISC_MDDREN
str r1, [r0, #ESDMISC_ROF]
/* Check The chip version TO1 or TO2 */
ldr r1, SOC_SI_ID_REG_W
ldr r1, [r1]
ands r1, r1, #0xF0000000
/* add Latency on CAS only for TO2 */
ldreq r1, SDRAM_ESDCFG_T2_W
ldrne r1, SDRAM_ESDCFG_T1_W
str r1, [r0, #ESDCFG0_ROF]
/* Run initialization sequence */
ldr r1, SDRAM_PRECHARGE_CMD_W
str r1, [r0, #ESDCTL0_ROF]
ldr r1, [r2, #SDRAM_ALL_VAL]
ldr r1, SDRAM_AUTOREF_CMD_W
str r1, [r0, #ESDCTL0_ROF]
ldr r1, [r2, #SDRAM_ALL_VAL]
ldr r1, [r2, #SDRAM_ALL_VAL]
ldr r1, SDRAM_LOADMODE_CMD_W
str r1, [r0, #ESDCTL0_ROF]
ldrb r1, [r2, #SDRAM_MODE_REGISTER_VAL]
add r3, r2, #SDRAM_EXT_MODE_REGISTER_VAL
ldrb r1, [r3]
ldr r1, SDRAM_NORMAL_CMD_W
str r1, [r0, #ESDCTL0_ROF]
#if (CONFIG_NR_DRAM_BANKS > 1)
/* 2nd sdram */
mov r2, #PHYS_SDRAM_2
/* Check The chip version TO1 or TO2 */
ldr r1, SOC_SI_ID_REG_W
ldr r1, [r1]
ands r1, r1, #0xF0000000
/* add Latency on CAS only for TO2 */
ldreq r1, SDRAM_ESDCFG_T2_W
ldrne r1, SDRAM_ESDCFG_T1_W
str r1, [r0, #ESDCFG1_ROF]
/* Run initialization sequence */
ldr r1, SDRAM_PRECHARGE_CMD_W
str r1, [r0, #ESDCTL1_ROF]
ldr r1, [r2, #SDRAM_ALL_VAL]
ldr r1, SDRAM_AUTOREF_CMD_W
str r1, [r0, #ESDCTL1_ROF]
ldr r1, [r2, #SDRAM_ALL_VAL]
ldr r1, [r2, #SDRAM_ALL_VAL]
ldr r1, SDRAM_LOADMODE_CMD_W
str r1, [r0, #ESDCTL1_ROF]
ldrb r1, [r2, #SDRAM_MODE_REGISTER_VAL]
add r3, r2, #SDRAM_EXT_MODE_REGISTER_VAL
ldrb r1, [r3]
ldr r1, SDRAM_NORMAL_CMD_W
str r1, [r0, #ESDCTL1_ROF]
#endif /* CONFIG_NR_DRAM_BANKS > 1 */
.endm /* sdram_init */
.globl lowlevel_init
lowlevel_init:
mov r10, lr
init_aipi
init_clock
sdram_init
mov pc,r10
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