diff options
Diffstat (limited to 'board/evb64260')
| -rw-r--r-- | board/evb64260/misc.S | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/board/evb64260/misc.S b/board/evb64260/misc.S new file mode 100644 index 0000000..4bbf6ef --- /dev/null +++ b/board/evb64260/misc.S @@ -0,0 +1,182 @@ +#include <config.h> +#include <74xx_7xx.h> +#include <version.h> + +#include <ppc_asm.tmpl> +#include <ppc_defs.h> + +#include <asm/cache.h> +#include <asm/mmu.h> + +#include <galileo/gt64260R.h> + +#ifdef CONFIG_ECC + /* Galileo specific asm code for initializing ECC */ + .globl board_relocate_rom +board_relocate_rom: + mflr r7 + /* update the location of the GT registers */ + lis r11, CFG_GT_REGS@h + /* if we're using ECC, we must use the DMA engine to copy ourselves */ + bl start_idma_transfer_0 + bl wait_for_idma_0 + bl stop_idma_engine_0 + + mtlr r7 + blr + + .globl board_init_ecc +board_init_ecc: + mflr r7 + /* NOTE: r10 still contains the location we've been relocated to + * which happens to be TOP_OF_RAM - CFG_MONITOR_LEN */ + + /* now that we're running from ram, init the rest of main memory + * for ECC use */ + lis r8, CFG_MONITOR_LEN@h + ori r8, r8, CFG_MONITOR_LEN@l + + divw r3, r10, r8 + + /* set up the counter, and init the starting address */ + mtctr r3 + li r12, 0 + + /* bytes per transfer */ + mr r5, r8 +about_to_init_ecc: +1: mr r3, r12 + mr r4, r12 + bl start_idma_transfer_0 + bl wait_for_idma_0 + bl stop_idma_engine_0 + add r12, r12, r8 + bdnz 1b + + mtlr r7 + blr + + /* r3: dest addr + * r4: source addr + * r5: byte count + * r11: gt regbase + * trashes: r6, r5 + */ +start_idma_transfer_0: + /* set the byte count, including the OWN bit */ + mr r6, r11 + ori r6, r6, CHANNEL0_DMA_BYTE_COUNT + stwbrx r5, 0, (r6) + + /* set the source address */ + mr r6, r11 + ori r6, r6, CHANNEL0_DMA_SOURCE_ADDRESS + stwbrx r4, 0, (r6) + + /* set the dest address */ + mr r6, r11 + ori r6, r6, CHANNEL0_DMA_DESTINATION_ADDRESS + stwbrx r3, 0, (r6) + + /* set the next record pointer */ + li r5, 0 + mr r6, r11 + ori r6, r6, CHANNEL0NEXT_RECORD_POINTER + stwbrx r5, 0, (r6) + + /* set the low control register */ + /* bit 9 is NON chained mode, bit 31 is new style descriptors. + bit 12 is channel enable */ + ori r5, r5, (1 << 12) | (1 << 12) | (1 << 11) + /* 15 shifted by 16 (oris) == bit 31 */ + oris r5, r5, (1 << 15) + mr r6, r11 + ori r6, r6, CHANNEL0CONTROL + stwbrx r5, 0, (r6) + + blr + + /* this waits for the bytecount to return to zero, indicating + * that the trasfer is complete */ +wait_for_idma_0: + mr r5, r11 + lis r6, 0xff + ori r6, r6, 0xffff + ori r5, r5, CHANNEL0_DMA_BYTE_COUNT +1: lwbrx r4, 0, (r5) + and. r4, r4, r6 + bne 1b + + blr + + /* this turns off channel 0 of the idma engine */ +stop_idma_engine_0: + /* shut off the DMA engine */ + li r5, 0 + mr r6, r11 + ori r6, r6, CHANNEL0CONTROL + stwbrx r5, 0, (r6) + + blr +#endif + +#ifdef CFG_BOARD_ASM_INIT + /* NOTE: trashes r3-r7 */ + .globl board_asm_init +board_asm_init: + /* just move the GT registers to where they belong */ + lis r3, CFG_DFL_GT_REGS@h + ori r3, r3, CFG_DFL_GT_REGS@l + lis r4, CFG_GT_REGS@h + ori r4, r4, CFG_GT_REGS@l + li r5, INTERNAL_SPACE_DECODE + + /* test to see if we've already moved */ + lwbrx r6, r5, r4 + andi. r6, r6, 0xffff + rlwinm r7, r4, 12, 16, 31 + cmp cr0, r7, r6 + beqlr + + /* nope, have to move the registers */ + lwbrx r6, r5, r3 + andis. r6, r6, 0xffff + or r6, r6, r7 + stwbrx r6, r5, r3 + + /* now, poll for the change */ +1: lwbrx r7, r5, r4 + cmp cr0, r7, r6 + bne 1b + + /* done! */ + blr +#endif + +/* For use of the debug LEDs */ + .global led_on0 +led_on0: + xor r18, r18, r18 + lis r18, 0x1c80 + ori r18, r18, 0x8000 + stw r18, 0x0(r18) + sync + blr + + .global led_on1 +led_on1: + xor r18, r18, r18 + lis r18, 0x1c80 + ori r18, r18, 0xc000 + stw r18, 0x0(r18) + sync + blr + + .global led_on2 +led_on2: + xor r18, r18, r18 + lis r18, 0x1c81 + ori r18, r18, 0x0000 + stw r18, 0x0(r18) + sync + blr |