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/*
* For clock initialization, see chapter 3 of the "MCIMX27 Multimedia
* Applications Processor Reference Manual, Rev. 0.2".
*
*/
#include <config.h>
#include <mach/imx-regs.h>
#define writel(val, reg) \
ldr r0, =reg; \
ldr r1, =val; \
str r1, [r0];
#define ESDCTL0_VAL (ESDCTL0_SDE | ESDCTL0_ROW13 | ESDCTL0_COL10)
.macro sdram_init
/*
* DDR on CSD0
*/
writel(0x00000008, ESDMISC) /* Enable DDR SDRAM operation */
writel(0x55555555, DSCR(3)) /* Set the driving strength */
writel(0x55555555, DSCR(5))
writel(0x55555555, DSCR(6))
writel(0x00005005, DSCR(7))
writel(0x15555555, DSCR(8))
writel(0x00000004, ESDMISC) /* Initial reset */
writel(0x006ac73a, ESDCFG0)
writel(ESDCTL0_VAL | ESDCTL0_SMODE_PRECHARGE, ESDCTL0) /* precharge CSD0 all banks */
writel(0x00000000, 0xA0000F00) /* CSD0 precharge address (A10 = 1) */
writel(ESDCTL0_VAL | ESDCTL0_SMODE_AUTO_REFRESH, ESDCTL0)
ldr r0, =0xa0000f00
mov r1, #0
mov r2, #8
1:
str r1, [r0]
subs r2, #1
bne 1b
writel(ESDCTL0_VAL | ESDCTL0_SMODE_LOAD_MODE, ESDCTL0)
ldr r0, =0xA0000033
mov r1, #0xda
strb r1, [r0]
ldr r0, =0xA1000000
mov r1, #0xff
strb r1, [r0]
writel(ESDCTL0_VAL | ESDCTL0_DSIZ_31_0 | ESDCTL0_REF4 | ESDCTL0_BL | ESDCTL0_SMODE_NORMAL, ESDCTL0)
.endm
.section ".text_bare_init","ax"
.globl board_init_lowlevel
board_init_lowlevel:
mov r10, lr
/* ahb lite ip interface */
writel(0x20040304, AIPI1_PSR0)
writel(0xDFFBFCFB, AIPI1_PSR1)
writel(0x00000000, AIPI2_PSR0)
writel(0xFFFFFFFF, AIPI2_PSR1)
/* skip sdram initialization if we run from ram */
cmp pc, #0xa0000000
bls 1f
cmp pc, #0xc0000000
bhi 1f
mov pc,r10
1:
sdram_init
#ifdef CONFIG_NAND_IMX_BOOT
ldr sp, =0xa0f00000 /* Setup a temporary stack in SDRAM */
ldr r0, =IMX_NFC_BASE /* start of NFC SRAM */
ldr r2, =IMX_NFC_BASE + 0x1000 /* end of NFC SRAM */
/* skip NAND boot if not running from NFC space */
cmp pc, r0
bls ret
cmp pc, r2
bhi ret
/* Move ourselves out of NFC SRAM */
ldr r1, =TEXT_BASE
copy_loop:
ldmia r0!, {r3-r9} /* copy from source address [r0] */
stmia r1!, {r3-r9} /* copy to target address [r1] */
cmp r0, r2 /* until source end addreee [r2] */
ble copy_loop
ldr pc, =1f /* Jump to SDRAM */
1:
bl nand_boot /* Load barebox from NAND Flash */
ldr r1, =IMX_NFC_BASE - TEXT_BASE
sub r10, r10, r1 /* adjust return address from NFC SRAM */
/* to SDRAM */
#endif /* CONFIG_NAND_IMX_BOOT */
ret:
mov pc,r10
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