| #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 |
