/* * (C) Copyright 2008 * Mark Jonas * * (C) Copyright 2007 * Yoshihiro Shimoda * * board/mpr2/lowlevel_init.S * * SPDX-License-Identifier: GPL-2.0+ */ #include .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