diff options
| -rw-r--r-- | arch/arm/cpu/armv8/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/cpu/armv8/fel_utils.S | 78 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-sunxi/boot0.h | 14 | ||||
| -rw-r--r-- | include/configs/sunxi-common.h | 2 |
4 files changed, 94 insertions, 2 deletions
diff --git a/arch/arm/cpu/armv8/Makefile b/arch/arm/cpu/armv8/Makefile index 93d26f9856..f7b4a5ee46 100644 --- a/arch/arm/cpu/armv8/Makefile +++ b/arch/arm/cpu/armv8/Makefile @@ -27,6 +27,8 @@ obj-$(CONFIG_ARM_SMCCC) += smccc-call.o ifndef CONFIG_SPL_BUILD obj-$(CONFIG_ARMV8_SPIN_TABLE) += spin_table.o spin_table_v8.o +else +obj-$(CONFIG_ARCH_SUNXI) += fel_utils.o endif obj-$(CONFIG_$(SPL_)ARMV8_SEC_FIRMWARE_SUPPORT) += sec_firmware.o sec_firmware_asm.o diff --git a/arch/arm/cpu/armv8/fel_utils.S b/arch/arm/cpu/armv8/fel_utils.S new file mode 100644 index 0000000000..9510dcd9e4 --- /dev/null +++ b/arch/arm/cpu/armv8/fel_utils.S @@ -0,0 +1,78 @@ +/* + * Utility functions for FEL mode, when running SPL in AArch64. + * + * Copyright (c) 2017 Arm Ltd. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <asm-offsets.h> +#include <config.h> +#include <asm/system.h> +#include <linux/linkage.h> + +/* + * We don't overwrite save_boot_params() here, to save the FEL state upon + * entry, since this would run *after* the RMR reset, which clobbers that + * state. + * Instead we store the state _very_ early in the boot0 hook, *before* + * resetting to AArch64. + */ + +/* + * The FEL routines in BROM run in AArch32. + * Reset back into 32-bit mode here and restore the saved FEL state + * afterwards. + * Resetting back into AArch32/EL3 using the RMR always enters the BROM, + * but we can use the CPU hotplug mechanism to branch back to our code + * immediately. + */ +ENTRY(return_to_fel) + /* + * the RMR reset will clear all registers, so save the arguments + * (LR and SP) in the fel_stash structure, which we read anyways later + */ + adr x2, fel_stash + str w0, [x2] + str w1, [x2, #4] + + adr x1, fel_stash_addr // to find the fel_stash address in AA32 + str w2, [x1] + + ldr x0, =0xfa50392f // CPU hotplug magic +#ifdef CONFIG_MACH_SUN50I_H6 + ldr x2, =(SUNXI_RTC_BASE + 0x1b8) // BOOT_CPU_HP_FLAG_REG + str w0, [x2], #0x4 +#else + ldr x2, =(SUNXI_CPUCFG_BASE + 0x1a4) // offset for CPU hotplug base + str w0, [x2, #0x8] +#endif + adr x0, back_in_32 + str w0, [x2] + + dsb sy + isb sy + mov x0, #2 // RMR reset into AArch32 + dsb sy + msr RMR_EL3, x0 + isb sy +1: wfi + b 1b + +/* AArch32 code to restore the state from fel_stash and return back to FEL. */ +back_in_32: + .word 0xe59f0028 // ldr r0, [pc, #40] ; load fel_stash address + .word 0xe5901008 // ldr r1, [r0, #8] + .word 0xe129f001 // msr CPSR_fc, r1 + .word 0xf57ff06f // isb + .word 0xe590d000 // ldr sp, [r0] + .word 0xe590e004 // ldr lr, [r0, #4] + .word 0xe5901010 // ldr r1, [r0, #16] + .word 0xee0c1f10 // mcr 15, 0, r1, cr12, cr0, {0} ; VBAR + .word 0xe590100c // ldr r1, [r0, #12] + .word 0xee011f10 // mcr 15, 0, r1, cr1, cr0, {0} ; SCTLR + .word 0xf57ff06f // isb + .word 0xe12fff1e // bx lr ; return to FEL +fel_stash_addr: + .word 0x00000000 // receives fel_stash addr, by AA64 code above +ENDPROC(return_to_fel) diff --git a/arch/arm/include/asm/arch-sunxi/boot0.h b/arch/arm/include/asm/arch-sunxi/boot0.h index 54c144afd8..46d0f0666c 100644 --- a/arch/arm/include/asm/arch-sunxi/boot0.h +++ b/arch/arm/include/asm/arch-sunxi/boot0.h @@ -15,6 +15,19 @@ tst x0, x0 // this is "b #0x84" in ARM b reset .space 0x7c + + .word 0xe28f0058 // add r0, pc, #88 + .word 0xe59f1054 // ldr r1, [pc, #84] + .word 0xe0800001 // add r0, r0, r1 + .word 0xe580d000 // str sp, [r0] + .word 0xe580e004 // str lr, [r0, #4] + .word 0xe10fe000 // mrs lr, CPSR + .word 0xe580e008 // str lr, [r0, #8] + .word 0xee11ef10 // mrc 15, 0, lr, cr1, cr0, {0} + .word 0xe580e00c // str lr, [r0, #12] + .word 0xee1cef10 // mrc 15, 0, lr, cr12, cr0, {0} + .word 0xe580e010 // str lr, [r0, #16] + .word 0xe59f1024 // ldr r1, [pc, #36] ; 0x170000a0 .word 0xe59f0024 // ldr r0, [pc, #36] ; CONFIG_*_TEXT_BASE .word 0xe5810000 // str r0, [r1] @@ -36,6 +49,7 @@ #else .word CONFIG_SYS_TEXT_BASE #endif + .word fel_stash - . #else /* normal execution */ b reset diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h index a6a4879523..203cb10fba 100644 --- a/include/configs/sunxi-common.h +++ b/include/configs/sunxi-common.h @@ -163,9 +163,7 @@ #define CONFIG_SYS_MONITOR_LEN (768 << 10) /* 768 KiB */ -#ifndef CONFIG_ARM64 /* AArch64 FEL support is not ready yet */ #define CONFIG_SPL_BOARD_LOAD_IMAGE -#endif /* * We cannot use expressions here, because expressions won't be evaluated in |