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/*
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* (C) Copyright 2009 Faraday Technology
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* Po-Yu Chuang <ratbert@faraday-tech.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#include <version.h>
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#include <asm/macro.h>
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#include <faraday/ftsdmc020.h>
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/*
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* parameters for the SDRAM controller
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*/
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#define TP0_A (CONFIG_FTSDMC020_BASE + FTSDMC020_OFFSET_TP0)
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#define TP1_A (CONFIG_FTSDMC020_BASE + FTSDMC020_OFFSET_TP1)
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#define CR_A (CONFIG_FTSDMC020_BASE + FTSDMC020_OFFSET_CR)
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#define B0_BSR_A (CONFIG_FTSDMC020_BASE + FTSDMC020_OFFSET_BANK0_BSR)
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#define ACR_A (CONFIG_FTSDMC020_BASE + FTSDMC020_OFFSET_ACR)
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#define TP0_D CONFIG_SYS_FTSDMC020_TP0
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#define TP1_D CONFIG_SYS_FTSDMC020_TP1
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#define CR_D1 FTSDMC020_CR_IPREC
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#define CR_D2 FTSDMC020_CR_ISMR
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#define CR_D3 FTSDMC020_CR_IREF
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#define B0_BSR_D (CONFIG_SYS_FTSDMC020_BANK0_BSR | \
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FTSDMC020_BANK_BASE(PHYS_SDRAM_1))
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#define ACR_D FTSDMC020_ACR_TOC(0x18)
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/*
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* numeric 7 segment display
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*/
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.macro led, num
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write32 CONFIG_DEBUG_LED, \num
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.endm
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/*
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* Waiting for SDRAM to set up
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*/
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.macro wait_sdram
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ldr r0, =CONFIG_FTSDMC020_BASE
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1:
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ldr r1, [r0, #FTSDMC020_OFFSET_CR]
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cmp r1, #0
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bne 1b
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.endm
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.globl lowlevel_init
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lowlevel_init:
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mov r11, lr
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led 0x0
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bl init_sdmc
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led 0x1
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/* everything is fine now */
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mov lr, r11
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mov pc, lr
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/*
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* memory initialization
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*/
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init_sdmc:
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led 0x10
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/* set SDRAM register */
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write32 TP0_A, TP0_D
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led 0x11
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write32 TP1_A, TP1_D
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led 0x12
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/* set to precharge */
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write32 CR_A, CR_D1
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led 0x13
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wait_sdram
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led 0x14
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/* set mode register */
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write32 CR_A, CR_D2
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led 0x15
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wait_sdram
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led 0x16
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/* set to refresh */
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write32 CR_A, CR_D3
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led 0x17
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wait_sdram
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led 0x18
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write32 B0_BSR_A, B0_BSR_D
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led 0x19
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write32 ACR_A, ACR_D
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led 0x1a
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mov pc, lr
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