diff options
Diffstat (limited to 'arch/arm/cpu/armv7/uniphier/lowlevel_init.S')
| -rw-r--r-- | arch/arm/cpu/armv7/uniphier/lowlevel_init.S | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/uniphier/lowlevel_init.S b/arch/arm/cpu/armv7/uniphier/lowlevel_init.S new file mode 100644 index 00000000000..0ea12d3cfc6 --- /dev/null +++ b/arch/arm/cpu/armv7/uniphier/lowlevel_init.S @@ -0,0 +1,159 @@ +/* + * Copyright (C) 2012-2014 Panasonic Corporation + * Author: Masahiro Yamada <yamada.m@jp.panasonic.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <config.h> +#include <linux/linkage.h> +#include <asm/system.h> +#include <asm/arch/led.h> +#include <asm/arch/arm-mpcore.h> +#include <asm/arch/sbc-regs.h> + +ENTRY(lowlevel_init) + mov r8, lr @ persevere link reg across call + + /* + * The UniPhier Boot ROM loads SPL code to the L2 cache. + * But CPUs can only do instruction fetch now because start.S has + * cleared C and M bits. + * First we need to turn on MMU and Dcache again to get back + * data access to L2. + */ + mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register) + orr r0, r0, #(CR_C | CR_M) @ enable MMU and Dcache + mcr p15, 0, r0, c1, c0, 0 + + /* + * Now we are using the page table embedded in the Boot ROM. + * It is not handy since it is not a straight mapped table for sLD3. + * What we need to do next is to switch over to the page table in SPL. + */ + ldr r3, =init_page_table @ page table must be 16KB aligned + + /* Disable MMU and Dcache before switching Page Table */ + mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register) + bic r0, r0, #(CR_C | CR_M) @ disable MMU and Dcache + mcr p15, 0, r0, c1, c0, 0 + + bl enable_mmu + +#ifdef CONFIG_UNIPHIER_SMP + /* + * ACTLR (Auxiliary Control Register) for Cortex-A9 + * bit[9] Parity on + * bit[8] Alloc in one way + * bit[7] EXCL (Exclusive cache bit) + * bit[6] SMP + * bit[3] Write full line of zeros mode + * bit[2] L1 Prefetch enable + * bit[1] L2 prefetch enable + * bit[0] FW (Cache and TLB maintenance broadcast) + */ + mrc p15, 0, r0, c1, c0, 1 @ ACTLR (Auxiliary Control Register) + orr r0, r0, #0x41 @ enable SMP, FW bit + mcr p15, 0, r0, c1, c0, 1 + + /* branch by CPU ID */ + mrc p15, 0, r0, c0, c0, 5 @ MPIDR (Multiprocessor Affinity Register) + and r0, r0, #0x3 + cmp r0, #0x0 + beq primary_cpu + ldr r1, =ROM_BOOT_ROMRSV2 + mov r0, #0 + str r0, [r1] +0: wfe + ldr r0, [r1] + cmp r0, #0 + beq 0b + bx r0 @ r0: entry point of U-Boot main for the secondary CPU +primary_cpu: + ldr r1, =ROM_BOOT_ROMRSV2 + ldr r0, =_start @ entry for the secondary CPU + str r0, [r1] + ldr r0, [r1] @ make sure str is complete before sev + sev @ kick the sedoncary CPU + mrc p15, 4, r1, c15, c0, 0 @ Configuration Base Address Register + bfc r1, #0, #13 @ clear bit 12-0 + mov r0, #-1 + str r0, [r1, #SCU_INV_ALL] @ SCU Invalidate All Register + mov r0, #1 @ SCU enable + str r0, [r1, #SCU_CTRL] @ SCU Control Register +#endif + + bl setup_init_ram @ RAM area for temporary stack pointer + + mov lr, r8 @ restore link + mov pc, lr @ back to my caller +ENDPROC(lowlevel_init) + +ENTRY(enable_mmu) + mrc p15, 0, r0, c2, c0, 2 @ TTBCR (Translation Table Base Control Register) + bic r0, r0, #0x37 + orr r0, r0, #0x20 @ disable TTBR1 + mcr p15, 0, r0, c2, c0, 2 + + orr r0, r3, #0x8 @ Outer Cacheability for table walks: WBWA + mcr p15, 0, r0, c2, c0, 0 @ TTBR0 + + mov r0, #0 + mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs + + mov r0, #-1 @ manager for all domains (No permission check) + mcr p15, 0, r0, c3, c0, 0 @ DACR (Domain Access Control Register) + + dsb + isb + /* + * MMU on: + * TLBs was already invalidated in "../start.S" + * So, we don't need to invalidate it here. + */ + mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register) + orr r0, r0, #(CR_C | CR_M) @ MMU and Dcache enable + mcr p15, 0, r0, c1, c0, 0 + + mov pc, lr +ENDPROC(enable_mmu) + +#include <asm/arch/ssc-regs.h> + +#define BOOT_RAM_SIZE (SSC_WAY_SIZE) +#define BOOT_WAY_BITS (0x00000100) /* way 8 */ + +ENTRY(setup_init_ram) + /* + * Touch to zero for the boot way + */ +0: + /* + * set SSCOQM, SSCOQAD, SSCOQSZ, SSCOQWN in this order + */ + ldr r0, = 0x00408006 @ touch to zero with address range + ldr r1, = SSCOQM + str r0, [r1] + ldr r0, = (CONFIG_SYS_INIT_SP_ADDR - BOOT_RAM_SIZE) @ base address + ldr r1, = SSCOQAD + str r0, [r1] + ldr r0, = BOOT_RAM_SIZE + ldr r1, = SSCOQSZ + str r0, [r1] + ldr r0, = BOOT_WAY_BITS + ldr r1, = SSCOQWN + str r0, [r1] + ldr r1, = SSCOPPQSEF + ldr r0, [r1] + cmp r0, #0 @ check if the command is successfully set + bne 0b @ try again if an error occurres + + ldr r1, = SSCOLPQS +1: + ldr r0, [r1] + cmp r0, #0x4 + bne 1b @ wait until the operation is completed + str r0, [r1] @ clear the complete notification flag + + mov pc, lr +ENDPROC(setup_init_ram) |