From: Icenowy Zheng icenowy@aosc.io
Some Allwinner SoCs use ARM926EJ-S core.
Add Allwinner/sunXi specific code to ARM926EJ-S CPU dircetory.
Signed-off-by: Icenowy Zheng icenowy@aosc.io Reviewed-by: Andre Przywara andre.przywara@arm.com Signed-off-by: Jesse Taube Mr.Bossman075@gmail.com --- V1->V2: * Fix Copyright notice * Remove lowlevel_init * Remove replaced timer.c * Remove Read CP15 Control Register * Remove unused start.c V2->V3: * Add sdelay to arm926ejs/cpu.c --- arch/arm/cpu/arm926ejs/Makefile | 1 + arch/arm/cpu/arm926ejs/cpu.c | 13 ++++++ arch/arm/cpu/arm926ejs/sunxi/Makefile | 5 +++ arch/arm/cpu/arm926ejs/sunxi/config.mk | 6 +++ arch/arm/cpu/arm926ejs/sunxi/fel_utils.S | 33 ++++++++++++++ arch/arm/cpu/arm926ejs/sunxi/u-boot-spl.lds | 48 +++++++++++++++++++++ 6 files changed, 106 insertions(+) create mode 100644 arch/arm/cpu/arm926ejs/sunxi/Makefile create mode 100644 arch/arm/cpu/arm926ejs/sunxi/config.mk create mode 100644 arch/arm/cpu/arm926ejs/sunxi/fel_utils.S create mode 100644 arch/arm/cpu/arm926ejs/sunxi/u-boot-spl.lds
diff --git a/arch/arm/cpu/arm926ejs/Makefile b/arch/arm/cpu/arm926ejs/Makefile index b901b7c5c9..7f1436d76e 100644 --- a/arch/arm/cpu/arm926ejs/Makefile +++ b/arch/arm/cpu/arm926ejs/Makefile @@ -15,6 +15,7 @@ endif obj-$(CONFIG_MX27) += mx27/ obj-$(if $(filter mxs,$(SOC)),y) += mxs/ obj-$(if $(filter spear,$(SOC)),y) += spear/ +obj-$(CONFIG_ARCH_SUNXI) += sunxi/
# some files can only build in ARM or THUMB2, not THUMB1
diff --git a/arch/arm/cpu/arm926ejs/cpu.c b/arch/arm/cpu/arm926ejs/cpu.c index 93d7a02ed4..2ce413a7f8 100644 --- a/arch/arm/cpu/arm926ejs/cpu.c +++ b/arch/arm/cpu/arm926ejs/cpu.c @@ -21,6 +21,19 @@
static void cache_flush(void);
+/************************************************************ + * sdelay() - simple spin loop. Will be constant time as + * its generally used in bypass conditions only. This + * is necessary until timers are accessible. + * + * not inline to increase chances its in cache when called + *************************************************************/ +void sdelay(unsigned long loops) +{ + __asm__ volatile ("1:\n" "subs %0, %1, #1\n" + "bne 1b":"=r" (loops):"0"(loops)); +} + int cleanup_before_linux (void) { /* diff --git a/arch/arm/cpu/arm926ejs/sunxi/Makefile b/arch/arm/cpu/arm926ejs/sunxi/Makefile new file mode 100644 index 0000000000..7d8b959dcd --- /dev/null +++ b/arch/arm/cpu/arm926ejs/sunxi/Makefile @@ -0,0 +1,5 @@ +# SPDX-License-Identifier: GPL-2.0+ +# (C) Copyright 2012 Henrik Nordstrom henrik@henriknordstrom.net + +obj-y += fel_utils.o +CFLAGS_fel_utils.o := -marm diff --git a/arch/arm/cpu/arm926ejs/sunxi/config.mk b/arch/arm/cpu/arm926ejs/sunxi/config.mk new file mode 100644 index 0000000000..76ffec9df6 --- /dev/null +++ b/arch/arm/cpu/arm926ejs/sunxi/config.mk @@ -0,0 +1,6 @@ +# Build a combined spl + u-boot image +ifdef CONFIG_SPL +ifndef CONFIG_SPL_BUILD +ALL-y += u-boot-sunxi-with-spl.bin +endif +endif diff --git a/arch/arm/cpu/arm926ejs/sunxi/fel_utils.S b/arch/arm/cpu/arm926ejs/sunxi/fel_utils.S new file mode 100644 index 0000000000..08be7ed11a --- /dev/null +++ b/arch/arm/cpu/arm926ejs/sunxi/fel_utils.S @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Utility functions for FEL mode. + * + * Copyright (c) 2015 Google, Inc + */ + +#include <asm-offsets.h> +#include <config.h> +#include <asm/system.h> +#include <linux/linkage.h> + +ENTRY(save_boot_params) + ldr r0, =fel_stash + str sp, [r0, #0] + str lr, [r0, #4] + mrs lr, cpsr @ Read CPSR + str lr, [r0, #8] + mrc p15, 0, lr, c1, c0, 0 @ Read CP15 SCTLR Register + str lr, [r0, #12] + b save_boot_params_ret +ENDPROC(save_boot_params) + +ENTRY(return_to_fel) + mov sp, r0 + mov lr, r1 + ldr r0, =fel_stash + ldr r1, [r0, #16] + mcr p15, 0, r1, c1, c0, 0 @ Write CP15 Control Register + ldr r1, [r0, #12] + msr cpsr, r1 @ Write CPSR + bx lr +ENDPROC(return_to_fel) diff --git a/arch/arm/cpu/arm926ejs/sunxi/u-boot-spl.lds b/arch/arm/cpu/arm926ejs/sunxi/u-boot-spl.lds new file mode 100644 index 0000000000..9a000ac5d3 --- /dev/null +++ b/arch/arm/cpu/arm926ejs/sunxi/u-boot-spl.lds @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * (C) Copyright 2018 + * Icenowy Zheng icenowy@aosc.io + * + * Based on arch/arm/cpu/armv7/sunxi/u-boot-spl.lds: + */ +MEMORY { .sram : ORIGIN = CONFIG_SPL_TEXT_BASE,\ + LENGTH = CONFIG_SPL_MAX_SIZE } +MEMORY { .sdram : ORIGIN = CONFIG_SPL_BSS_START_ADDR, \ + LENGTH = CONFIG_SPL_BSS_MAX_SIZE } + +OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm") +OUTPUT_ARCH(arm) +ENTRY(_start) +SECTIONS +{ + .text : + { + __start = .; + *(.vectors) + *(.text*) + } > .sram + + . = ALIGN(4); + .rodata : { *(SORT_BY_ALIGNMENT(.rodata*)) } >.sram + + . = ALIGN(4); + .data : { *(SORT_BY_ALIGNMENT(.data*)) } >.sram + + . = ALIGN(4); + .u_boot_list : { + KEEP(*(SORT(.u_boot_list*))); + } > .sram + + . = ALIGN(4); + __image_copy_end = .; + _end = .; + + .bss : + { + . = ALIGN(4); + __bss_start = .; + *(.bss*) + . = ALIGN(4); + __bss_end = .; + } > .sdram +}