97 lines
1.9 KiB
ArmAsm
97 lines
1.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2011
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* Matthias Weisser <weisserm@arcor.de>
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*
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* (C) Copyright 2009 DENX Software Engineering
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* Author: John Rigby <jrigby@gmail.com>
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*
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* Based on U-Boot and RedBoot sources for several different i.mx
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* platforms.
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*/
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#include <asm/macro.h>
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#include <asm/arch/macro.h>
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#include <asm/arch/imx-regs.h>
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#include <generated/asm-offsets.h>
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/*
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* clocks
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*/
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.macro init_clocks
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/* disable clock output */
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write32 IMX_CCM_BASE + CCM_MCR, 0x00000000
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write32 IMX_CCM_BASE + CCM_CCTL, 0x50030000
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/*
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* enable all implemented clocks in all three
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* clock control registers
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*/
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write32 IMX_CCM_BASE + CCM_CGCR0, 0x1fffffff
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write32 IMX_CCM_BASE + CCM_CGCR1, 0xffffffff
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write32 IMX_CCM_BASE + CCM_CGCR2, 0xfffff
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/* Devide NAND clock by 32 */
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write32 IMX_CCM_BASE + CCM_PCDR2, 0x0101011F
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.endm
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/*
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* sdram controller init
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*/
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.macro init_lpddr
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ldr r0, =IMX_ESDRAMC_BASE
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ldr r2, =IMX_SDRAM_BANK0_BASE
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/*
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* reset SDRAM controller
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* then wait for initialization to complete
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*/
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ldr r1, =(1 << 1) | (1 << 2)
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str r1, [r0, #ESDRAMC_ESDMISC]
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1: ldr r3, [r0, #ESDRAMC_ESDMISC]
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tst r3, #(1 << 31)
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beq 1b
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ldr r1, =(1 << 2)
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str r1, [r0, #ESDRAMC_ESDMISC]
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ldr r1, =0x002a7420
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str r1, [r0, #ESDRAMC_ESDCFG0]
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/* control | precharge */
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ldr r1, =0x92216008
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str r1, [r0, #ESDRAMC_ESDCTL0]
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/* dram command encoded in address */
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str r1, [r2, #0x400]
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/* auto refresh */
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ldr r1, =0xa2216008
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str r1, [r0, #ESDRAMC_ESDCTL0]
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/* read dram twice to auto refresh */
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ldr r3, [r2]
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ldr r3, [r2]
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/* control | load mode */
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ldr r1, =0xb2216008
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str r1, [r0, #ESDRAMC_ESDCTL0]
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/* mode register of lpddram */
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strb r1, [r2, #0x33]
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/* extended mode register of lpddrram */
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ldr r2, =0x81000000
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strb r1, [r2]
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/* control | normal */
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ldr r1, =0x82216008
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str r1, [r0, #ESDRAMC_ESDCTL0]
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.endm
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.globl lowlevel_init
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lowlevel_init:
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init_aips
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init_max
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init_clocks
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init_lpddr
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mov pc, lr
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