lowlevel_init.s

来自「最新版的u-boot,2008-10-18发布」· S 代码 · 共 149 行

/*
 * (C) Copyright 2008
 * Mark Jonas <[e-mail]>
 *
 * (C) Copyright 2007
 * Yoshihiro Shimoda <[e-mail]>
 *
 * board/mpr2/lowlevel_init.S
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

	.global	lowlevel_init

	.text
	.align	2

lowlevel_init:

/*
 * Set frequency multipliers and dividers in FRQCR.
 */
	mov.l	WTCSR_A,r1
	mov.l	WTCSR_D,r0
	mov.w	r0,@r1

	mov.l	WTCNT_A,r1
	mov.l	WTCNT_D,r0
	mov.w	r0,@r1

	mov.l	FRQCR_A,r1
	mov.l	FRQCR_D,r0
	mov.w	r0,@r1

/*
 * Setup CS0 (Flash).
 */
	mov.l	CS0BCR_A, r1
	mov.l	CS0BCR_D, r0
	mov.l	r0, @r1

	mov.l	CS0WCR_A, r1
	mov.l	CS0WCR_D, r0
	mov.l	r0, @r1

/*
 * Setup CS3 (SDRAM).
 */
	mov.l	CS3BCR_A, r1
	mov.l	CS3BCR_D, r0
	mov.l	r0, @r1

	mov.l	CS3WCR_A, r1
	mov.l	CS3WCR_D, r0
	mov.l	r0, @r1

	mov.l	SDCR_A, r1
	mov.l	SDCR_D1, r0
	mov.l	r0, @r1

	mov.l	RTCSR_A, r1
	mov.l	RTCSR_D, r0
	mov.l	r0, @r1

	mov.l	RTCNT_A, r1
	mov.l	RTCNT_D, r0
	mov.l	r0, @r1

	mov.l	RTCOR_A, r1
	mov.l	RTCOR_D, r0
	mov.l	r0, @r1

	mov.l	SDCR_A, r1
	mov.l	SDCR_D2, r0
	mov.l	r0, @r1

	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:	.long	0x1103		/* I:B:P=8:4:2 */
WTCNT_D:	.long	0x5A00		/* start counting at zero */
WTCSR_D:	.long	0xA507		/* divide by 4096 */

/*
 * Spansion S29GL256N11 @ 48 MHz
 */
CS0BCR_D:	.long	0x12490400  /* 1 idle cycle inserted, normal space, 16 bit */
CS0WCR_D:	.long	0x00000340  /* tSW=0.5ck, 6 wait cycles, NO external wait, tHW=0.5ck */

/*
 * Samsung K4S511632B-UL75 @ 48 MHz
 * Micron MT48LC32M16A2-75 @ 48 MHz
 */
CS3BCR_D:	.long	0x10004400  /* CS3BCR = 0x10004400, minimum idle cycles, SDRAM, 16 bit */
CS3WCR_D:	.long	0x00000091  /* tRP=1ck, tRCD=1ck, CL=2, tRWL=2ck, tRC=4ck */
SDCR_D1:	.long	0x00000012  /* no refresh, 13 rows, 10 cols, NO bank active mode */
SDCR_D2:	.long	0x00000812  /* refresh */
RTCSR_D:	.long	0xA55A0008  /* 1/4, once */
RTCNT_D:	.long	0xA55A005D  /* count 93 */
RTCOR_D:	.long	0xa55a005d  /* count 93 */
SDMR3_D:	.long	0x440       /* mode register CL2, burst read and SINGLE WRITE */

/*
 * 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