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/*
* (C) Copyright 2013 Philippe Reynes <tremyfr@yahoo.fr>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <generated/asm-offsets.h>
#include <asm/macro.h>
#include <asm/arch/imx-regs.h>
#include "apf27.h"
.macro init_aipi
/*
* setup AIPI1 and AIPI2
*/
write32 AIPI1_PSR0, ACFG_AIPI1_PSR0_VAL
write32 AIPI1_PSR1, ACFG_AIPI1_PSR1_VAL
write32 AIPI2_PSR0, ACFG_AIPI2_PSR0_VAL
write32 AIPI2_PSR1, ACFG_AIPI2_PSR1_VAL
/* Change SDRAM signal strengh */
ldr r0, =GPCR
ldr r1, =ACFG_GPCR_VAL
ldr r5, [r0]
orr r5, r5, r1
str r5, [r0]
.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]
/*
* pll clock initialization predefined in apf27.h
*/
write32 MPCTL0, ACFG_MPCTL0_VAL
write32 SPCTL0, ACFG_SPCTL0_VAL
write32 CSCR, ACFG_CSCR_VAL|CSCR_MPLL_RESTART|CSCR_SPLL_RESTART
/*
* add some delay here
*/
mov r1, #0x1000
1: subs r1, r1, #0x1
bne 1b
/* peripheral clock divider */
write32 PCDR0, ACFG_PCDR0_VAL
write32 PCDR1, ACFG_PCDR1_VAL
/* Configure PCCR0 and PCCR1 */
write32 PCCR0, ACFG_PCCR0_VAL
write32 PCCR1, ACFG_PCCR1_VAL
.endm /* init_clock */
.macro init_ddr
/* wait for SDRAM/LPDDR ready (SDRAMRDY) */
ldr r0, =IMX_ESD_BASE
ldr r4, =ESDMISC_SDRAM_RDY
2: ldr r1, [r0, #ESDMISC_ROF]
ands r1, r1, r4
bpl 2b
/* LPDDR Soft Reset Mobile/Low Power DDR SDRAM. */
ldr r0, =IMX_ESD_BASE
ldr r4, =ACFG_ESDMISC_VAL
orr r1, r4, #ESDMISC_MDDR_DL_RST
str r1, [r0, #ESDMISC_ROF]
/* Hold for more than 200ns */
ldr r1, =0x10000
1: subs r1, r1, #0x1
bne 1b
str r4, [r0]
ldr r0, =IMX_ESD_BASE
ldr r1, =ACFG_SDRAM_ESDCFG_REGISTER_VAL
str r1, [r0, #ESDCFG0_ROF]
ldr r0, =IMX_ESD_BASE
ldr r1, =ACFG_PRECHARGE_CMD
str r1, [r0, #ESDCTL0_ROF]
/* write8(0xA0001000, any value) */
ldr r1, =PHYS_SDRAM_1+ACFG_SDRAM_PRECHARGE_ALL_VAL
strb r2, [r1]
ldr r1, =ACFG_AUTOREFRESH_CMD
str r1, [r0, #ESDCTL0_ROF]
ldr r4, =PHYS_SDRAM_1 /* CSD0 base address */
ldr r6,=0x7 /* load loop counter */
1: str r5,[r4] /* run auto-refresh cycle to array 0 */
subs r6,r6,#1
bne 1b
ldr r1, =ACFG_SET_MODE_REG_CMD
str r1, [r0, #ESDCTL0_ROF]
/* set standard mode register */
ldr r4, = PHYS_SDRAM_1+ACFG_SDRAM_MODE_REGISTER_VAL
strb r2, [r4]
/* set extended mode register */
ldr r4, =PHYS_SDRAM_1+ACFG_SDRAM_EXT_MODE_REGISTER_VAL
strb r5, [r4]
ldr r1, =ACFG_NORMAL_RW_CMD
str r1, [r0, #ESDCTL0_ROF]
/* 2nd sdram */
ldr r0, =IMX_ESD_BASE
ldr r1, =ACFG_SDRAM_ESDCFG_REGISTER_VAL
str r1, [r0, #ESDCFG1_ROF]
ldr r0, =IMX_ESD_BASE
ldr r1, =ACFG_PRECHARGE_CMD
str r1, [r0, #ESDCTL1_ROF]
/* write8(0xB0001000, any value) */
ldr r1, =PHYS_SDRAM_2+ACFG_SDRAM_PRECHARGE_ALL_VAL
strb r2, [r1]
ldr r1, =ACFG_AUTOREFRESH_CMD
str r1, [r0, #ESDCTL1_ROF]
ldr r4, =PHYS_SDRAM_2 /* CSD1 base address */
ldr r6,=0x7 /* load loop counter */
1: str r5,[r4] /* run auto-refresh cycle to array 0 */
subs r6,r6,#1
bne 1b
ldr r1, =ACFG_SET_MODE_REG_CMD
str r1, [r0, #ESDCTL1_ROF]
/* set standard mode register */
ldr r4, =PHYS_SDRAM_2+ACFG_SDRAM_MODE_REGISTER_VAL
strb r2, [r4]
/* set extended mode register */
ldr r4, =PHYS_SDRAM_2+ACFG_SDRAM_EXT_MODE_REGISTER_VAL
strb r2, [r4]
ldr r1, =ACFG_NORMAL_RW_CMD
str r1, [r0, #ESDCTL1_ROF]
.endm /* init_ddr */
.globl lowlevel_init
lowlevel_init:
init_aipi
init_clock
#ifdef CONFIG_SPL_BUILD
init_ddr
#endif
mov pc, lr
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