diff options
Diffstat (limited to 'arch/arm/cpu/armv7/tegra2/lowlevel_init.S')
| -rw-r--r-- | arch/arm/cpu/armv7/tegra2/lowlevel_init.S | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/tegra2/lowlevel_init.S b/arch/arm/cpu/armv7/tegra2/lowlevel_init.S index 7f15746861..f24a2ff57d 100644 --- a/arch/arm/cpu/armv7/tegra2/lowlevel_init.S +++ b/arch/arm/cpu/armv7/tegra2/lowlevel_init.S @@ -26,6 +26,7 @@ #include <config.h> #include <version.h> + _TEXT_BASE: .word CONFIG_SYS_TEXT_BASE @ sdram load addr from config file @@ -58,8 +59,101 @@ lowlevel_init: mov pc, lr @ back to arch calling code + +.globl startup_cpu +startup_cpu: + @ Initialize the AVP, clocks, and memory controller + @ SDRAM is guaranteed to be on at this point + + ldr r0, =cold_boot @ R0 = reset vector for CPU + bl start_cpu @ start the CPU + + @ Transfer control to the AVP code + bl halt_avp + + @ Should never get here +_loop_forever2: + b _loop_forever2 + +.globl cache_configure +cache_configure: + stmdb r13!,{r14} + @ invalidate instruction cache + mov r1, #0 + mcr p15, 0, r1, c7, c5, 0 + + @ invalidate the i&d tlb entries + mcr p15, 0, r1, c8, c5, 0 + mcr p15, 0, r1, c8, c6, 0 + + @ enable instruction cache + mrc p15, 0, r1, c1, c0, 0 + orr r1, r1, #(1<<12) + mcr p15, 0, r1, c1, c0, 0 + + bl enable_scu + + @ enable SMP mode and FW for CPU0, by writing to Auxiliary Ctl reg + mrc p15, 0, r0, c1, c0, 1 + orr r0, r0, #0x41 + mcr p15, 0, r0, c1, c0, 1 + + @ Now flush the Dcache + mov r0, #0 + @ 256 cache lines + mov r1, #256 + +invalidate_loop: + add r1, r1, #-1 + mov r0, r1, lsl #5 + @ invalidate d-cache using line (way0) + mcr p15, 0, r0, c7, c6, 2 + + orr r2, r0, #(1<<30) + @ invalidate d-cache using line (way1) + mcr p15, 0, r2, c7, c6, 2 + + orr r2, r0, #(2<<30) + @ invalidate d-cache using line (way2) + mcr p15, 0, r2, c7, c6, 2 + + orr r2, r0, #(3<<30) + @ invalidate d-cache using line (way3) + mcr p15, 0, r2, c7, c6, 2 + cmp r1, #0 + bne invalidate_loop + + @ FIXME: should have ap20's L2 disabled too? +invalidate_done: + ldmia r13!,{pc} + +.globl cold_boot +cold_boot: + msr cpsr_c, #0xD3 + @ Check current processor: CPU or AVP? + @ If CPU, go to CPU boot code, else continue on AVP path + + ldr r0, =NV_PA_PG_UP_BASE + ldr r1, [r0] + ldr r2, =PG_UP_TAG_AVP + + @ are we the CPU? + ldr sp, CPU_STACK + cmp r1, r2 + @ yep, we are the CPU + bne _armboot_start + + @ AVP initialization follows this path + ldr sp, AVP_STACK + @ Init AVP and start CPU + b startup_cpu + @ the literal pools origin .ltorg SRAM_STACK: .word LOW_LEVEL_SRAM_STACK +AVP_STACK: + .word EARLY_AVP_STACK +CPU_STACK: + .word EARLY_CPU_STACK |