lowlevel_init.S
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/*
* (C) Copyright 2008
* Mark Jonas <mark.jonas@de.bosch.com>
*
* (C) Copyright 2007
* Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
*
* board/mpr2/lowlevel_init.S
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm/macro.h>
.global lowlevel_init
.text
.align 2
lowlevel_init:
/*
* Set frequency multipliers and dividers in FRQCR.
*/
write16 WTCSR_A, WTCSR_D
write16 WTCNT_A, WTCNT_D
write16 FRQCR_A, FRQCR_D
/*
* Setup CS0 (Flash).
*/
write32 CS0BCR_A, CS0BCR_D
write32 CS0WCR_A, CS0WCR_D
/*
* Setup CS3 (SDRAM).
*/
write32 CS3BCR_A, CS3BCR_D
write32 CS3WCR_A, CS3WCR_D
write32 SDCR_A, SDCR_D1
write32 RTCSR_A, RTCSR_D
write32 RTCNT_A, RTCNT_D
write32 RTCOR_A, RTCOR_D
write32 SDCR_A, SDCR_D2
mov.l SDMR3_A, r1
mov.l SDMR3_D, r0
add r0, r1
mov #0, r0
mov.w r0, @r1
rts
nop
.align 4
/*
* Configuration for MPR2 A.3 through A.7
*/
/*
* PLL Settings
*/
FRQCR_D: .word 0x1103 /* I:B:P=8:4:2 */
WTCNT_D: .word 0x5A00 /* start counting at zero */
WTCSR_D: .word 0xA507 /* divide by 4096 */
.align 2
/*
* Spansion S29GL256N11 @ 48 MHz
*/
/* 1 idle cycle inserted, normal space, 16 bit */
CS0BCR_D: .long 0x12490400
/* tSW=0.5ck, 6 wait cycles, NO external wait, tHW=0.5ck */
CS0WCR_D: .long 0x00000340
/*
* Samsung K4S511632B-UL75 @ 48 MHz
* Micron MT48LC32M16A2-75 @ 48 MHz
*/
/* CS3BCR = 0x10004400, minimum idle cycles, SDRAM, 16 bit */
CS3BCR_D: .long 0x10004400
/* tRP=1ck, tRCD=1ck, CL=2, tRWL=2ck, tRC=4ck */
CS3WCR_D: .long 0x00000091
/* no refresh, 13 rows, 10 cols, NO bank active mode */
SDCR_D1: .long 0x00000012
SDCR_D2: .long 0x00000812 /* refresh */
RTCSR_D: .long 0xA55A0008 /* 1/4, once */
RTCNT_D: .long 0xA55A005D /* count 93 */
RTCOR_D: .long 0xa55a005d /* count 93 */
/* mode register CL2, burst read and SINGLE WRITE */
SDMR3_D: .long 0x440
/*
* Registers
*/
FRQCR_A: .long 0xA415FF80
WTCNT_A: .long 0xA415FF84
WTCSR_A: .long 0xA415FF86
#define BSC_BASE 0xA4FD0000
CS0BCR_A: .long BSC_BASE + 0x04
CS3BCR_A: .long BSC_BASE + 0x0C
CS0WCR_A: .long BSC_BASE + 0x24
CS3WCR_A: .long BSC_BASE + 0x2C
SDCR_A: .long BSC_BASE + 0x44
RTCSR_A: .long BSC_BASE + 0x48
RTCNT_A: .long BSC_BASE + 0x4C
RTCOR_A: .long BSC_BASE + 0x50
SDMR3_A: .long BSC_BASE + 0x5000