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#include <config.h>
#include <version.h>
#include <asm/arch/pxa-regs.h>
DRAM_SIZE: .long CONFIG_SYS_DRAM_SIZE
.globl lowlevel_init
lowlevel_init:
mov r10, lr
/* ---- GPIO INITIALISATION ---- */
/* Set up GPIO pins first (3 groups [31:0] [63:32] [80:64]) */
/* General purpose set registers */
ldr r0, =GPSR0
ldr r1, =CONFIG_SYS_GPSR0_VAL
str r1, [r0]
ldr r0, =GPSR1
ldr r1, =CONFIG_SYS_GPSR1_VAL
str r1, [r0]
ldr r0, =GPSR2
ldr r1, =CONFIG_SYS_GPSR2_VAL
str r1, [r0]
/* General purpose clear registers */
ldr r0, =GPCR0
ldr r1, =CONFIG_SYS_GPCR0_VAL
str r1, [r0]
ldr r0, =GPCR1
ldr r1, =CONFIG_SYS_GPCR1_VAL
str r1, [r0]
ldr r0, =GPCR2
ldr r1, =CONFIG_SYS_GPCR2_VAL
str r1, [r0]
/* General rising edge registers */
ldr r0, =GRER0
ldr r1, =CONFIG_SYS_GRER0_VAL
str r1, [r0]
ldr r0, =GRER1
ldr r1, =CONFIG_SYS_GRER1_VAL
str r1, [r0]
ldr r0, =GRER2
ldr r1, =CONFIG_SYS_GRER2_VAL
str r1, [r0]
/* General falling edge registers */
ldr r0, =GFER0
ldr r1, =CONFIG_SYS_GFER0_VAL
str r1, [r0]
ldr r0, =GFER1
ldr r1, =CONFIG_SYS_GFER1_VAL
str r1, [r0]
ldr r0, =GFER2
ldr r1, =CONFIG_SYS_GFER2_VAL
str r1, [r0]
/* General edge detect registers */
ldr r0, =GPDR0
ldr r1, =CONFIG_SYS_GPDR0_VAL
str r1, [r0]
ldr r0, =GPDR1
ldr r1, =CONFIG_SYS_GPDR1_VAL
str r1, [r0]
ldr r0, =GPDR2
ldr r1, =CONFIG_SYS_GPDR2_VAL
str r1, [r0]
/* General alternate function registers */
ldr r0, =GAFR0_L /* [0:15] */
ldr r1, =CONFIG_SYS_GAFR0_L_VAL
str r1, [r0]
ldr r0, =GAFR0_U /* [31:16] */
ldr r1, =CONFIG_SYS_GAFR0_U_VAL
str r1, [r0]
ldr r0, =GAFR1_L /* [47:32] */
ldr r1, =CONFIG_SYS_GAFR1_L_VAL
str r1, [r0]
ldr r0, =GAFR1_U /* [63:48] */
ldr r1, =CONFIG_SYS_GAFR1_U_VAL
str r1, [r0]
ldr r0, =GAFR2_L /* [79:64] */
ldr r1, =CONFIG_SYS_GAFR2_L_VAL
str r1, [r0]
ldr r0, =GAFR2_U /* [80] */
ldr r1, =CONFIG_SYS_GAFR2_U_VAL
str r1, [r0]
/* General purpose direction registers */
ldr r0, =GPDR0
ldr r1, =CONFIG_SYS_GPDR0_VAL
str r1, [r0]
ldr r0, =GPDR1
ldr r1, =CONFIG_SYS_GPDR1_VAL
str r1, [r0]
ldr r0, =GPDR2
ldr r1, =CONFIG_SYS_GPDR2_VAL
str r1, [r0]
/* Power manager sleep status */
ldr r0, =PSSR
ldr r1, =CONFIG_SYS_PSSR_VAL
str r1, [r0]
/* ---- MEMORY INITIALISATION ---- */
/* Initialize Memory Controller, see PXA250 Operating System Developer's Guide */
/* pause for 200 uSecs- allow internal clocks to settle */
ldr r3, =OSCR /* reset the OS Timer Count to zero */
mov r2, #0
str r2, [r3]
ldr r4, =0x300 /* really 0x2E1 is about 200usec, so 0x300 should be plenty */
1:
ldr r2, [r3]
cmp r4, r2
bgt 1b
mem_init:
/* get memory controller base address */
ldr r1, =MEMC_BASE
/* ---- FLASH INITIALISATION ---- */
/* Write MSC0 and read back to ensure data change is accepted by cpu */
ldr r2, =CONFIG_SYS_MSC0_VAL
str r2, [r1, #MSC0_OFFSET]
ldr r2, [r1, #MSC0_OFFSET]
/* ---- SDRAM INITIALISATION ---- */
/* get the MDREFR settings */
ldr r2, =CONFIG_SYS_MDREFR_VAL
str r2, [r1, #MDREFR_OFFSET]
/* fetch platform value of MDCNFG */
ldr r2, =CONFIG_SYS_MDCNFG_VAL
/* disable all sdram banks */
bic r2, r2, #(MDCNFG_DE0 | MDCNFG_DE1)
bic r2, r2, #(MDCNFG_DE2 | MDCNFG_DE3)
/* write initial value of MDCNFG, w/o enabling sdram banks */
str r2, [r1, #MDCNFG_OFFSET]
/* pause for 200 uSecs */
ldr r3, =OSCR /* reset the OS Timer Count to zero */
mov r2, #0
str r2, [r3]
ldr r4, =0x300 /* about 200 usec */
1:
ldr r2, [r3]
cmp r4, r2
bgt 1b
/* Access memory *not yet enabled* for CBR refresh cycles (8) */
/* CBR is generated for all banks */
ldr r2, =CONFIG_SYS_DRAM_BASE
str r2, [r2]
str r2, [r2]
str r2, [r2]
str r2, [r2]
str r2, [r2]
str r2, [r2]
str r2, [r2]
str r2, [r2]
/* get memory controller base address */
ldr r2, =MEMC_BASE
/* Enable SDRAM bank 0 in MDCNFG register */
ldr r2, [r1, #MDCNFG_OFFSET]
orr r2, r2, #MDCNFG_DE0
str r2, [r1, #MDCNFG_OFFSET]
/* write MDMRS to trigger an MSR command to all enabled SDRAM banks */
ldr r2, =CONFIG_SYS_MDMRS_VAL
str r2, [r1, #MDMRS_OFFSET]
/* ---- INTERRUPT INITIALISATION ---- */
/* Disable (mask) all interrupts at the interrupt controller */
/* clear the interrupt level register (use IRQ, not FIQ) */
mov r1, #0
ldr r2, =ICLR
str r1, [r2]
/* Set interrupt mask register */
ldr r1, =CONFIG_SYS_ICMR_VAL
ldr r2, =ICMR
str r1, [r2]
/* ---- CLOCK INITIALISATION ---- */
/* Disable the peripheral clocks, and set the core clock */
/* Turn Off ALL on-chip peripheral clocks for re-configuration */
ldr r1, =CKEN
mov r2, #0
str r2, [r1]
/* set core clocks */
ldr r2, =CONFIG_SYS_CCCR_VAL
ldr r1, =CCCR
str r2, [r1]
#ifdef ENABLE32KHZ
/* enable the 32Khz oscillator for RTC and PowerManager */
ldr r1, =OSCC
mov r2, #OSCC_OON
str r2, [r1]
/* NOTE: spin here until OSCC.OOK get set, meaning the PLL has settled. */
60:
ldr r2, [r1]
ands r2, r2, #1
beq 60b
#endif
/* Turn on needed clocks */
ldr r1, =CKEN
ldr r2, =CONFIG_SYS_CKEN_VAL
str r2, [r1]
mov pc, r10
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