Currently we do some magic "SRAM setup" MMIO writes in s_init(), copied from the original BSP U-Boot. The comment speaks of this being required before DRAM access gets enabled, but there is no indication that this would actually be required that early.
Move this out of s_init(), into board_init_f(). Since this actually only affects a very few older SoCs, the actual code goes into the cpu/armv7 directory, to move it out of the way for all other SoCs.
This also uses the opportunity to convert some #ifdefs over to the fancy IS_ENABLED() macros used in actual C code.
We keep the s_init() stub around for now, since armv8's lowlevel_init still relies on it.
Signed-off-by: Andre Przywara andre.przywara@arm.com --- arch/arm/cpu/armv7/sunxi/Makefile | 3 +++ arch/arm/cpu/armv7/sunxi/sram.c | 45 +++++++++++++++++++++++++++++++ arch/arm/mach-sunxi/board.c | 38 +++++--------------------- 3 files changed, 54 insertions(+), 32 deletions(-) create mode 100644 arch/arm/cpu/armv7/sunxi/sram.c
diff --git a/arch/arm/cpu/armv7/sunxi/Makefile b/arch/arm/cpu/armv7/sunxi/Makefile index 1d40d6a18dc..ad11be78632 100644 --- a/arch/arm/cpu/armv7/sunxi/Makefile +++ b/arch/arm/cpu/armv7/sunxi/Makefile @@ -10,6 +10,9 @@ obj-y += timer.o obj-$(CONFIG_MACH_SUN6I) += tzpc.o obj-$(CONFIG_MACH_SUN8I_H3) += tzpc.o
+obj-$(CONFIG_MACH_SUN6I) += sram.o +obj-$(CONFIG_MACH_SUN8I) += sram.o + ifndef CONFIG_SPL_BUILD obj-$(CONFIG_ARMV7_PSCI) += psci.o endif diff --git a/arch/arm/cpu/armv7/sunxi/sram.c b/arch/arm/cpu/armv7/sunxi/sram.c new file mode 100644 index 00000000000..19395cce17c --- /dev/null +++ b/arch/arm/cpu/armv7/sunxi/sram.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2012 Henrik Nordstrom henrik@henriknordstrom.net + * + * (C) Copyright 2007-2011 + * Allwinner Technology Co., Ltd. <www.allwinnertech.com> + * Tom Cubie tangliang@allwinnertech.com + * + * SRAM init for older sunxi SoCs. + */ + +#include <common.h> +#include <init.h> +#include <asm/io.h> + +void sunxi_sram_init(void) +{ + /* + * Undocumented magic taken from boot0, without this DRAM + * access gets messed up (seems cache related). + * The boot0 sources describe this as: "config ema for cache sram" + * Newer SoCs (A83T, H3 and anything beyond) don't need this anymore. + */ + if (IS_ENABLED(CONFIG_MACH_SUN6I)) + setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0x1800); + + if (IS_ENABLED(CONFIG_MACH_SUN8I)) { + uint version; + + /* Unlock sram version info reg, read it, relock */ + setbits_le32(SUNXI_SRAMC_BASE + 0x24, (1 << 15)); + version = readl(SUNXI_SRAMC_BASE + 0x24) >> 16; + clrbits_le32(SUNXI_SRAMC_BASE + 0x24, (1 << 15)); + + if (IS_ENABLED(CONFIG_MACH_SUN8I_A23)) { + if (version == 0x1650) + setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0x1800); + else /* 0x1661 ? */ + setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0xc0); + } else if (IS_ENABLED(CONFIG_MACH_SUN8I_A33)) { + if (version != 0x1667) + setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0xc0); + } + } +} diff --git a/arch/arm/mach-sunxi/board.c b/arch/arm/mach-sunxi/board.c index 8667ddf58e3..42ec02d96e3 100644 --- a/arch/arm/mach-sunxi/board.c +++ b/arch/arm/mach-sunxi/board.c @@ -186,38 +186,6 @@ SPL_LOAD_IMAGE_METHOD("FEL", 0, BOOT_DEVICE_BOARD, spl_board_load_image);
void s_init(void) { - /* - * Undocumented magic taken from boot0, without this DRAM - * access gets messed up (seems cache related). - * The boot0 sources describe this as: "config ema for cache sram" - */ -#if defined CONFIG_MACH_SUN6I - setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0x1800); -#elif defined CONFIG_MACH_SUN8I - __maybe_unused uint version; - - /* Unlock sram version info reg, read it, relock */ - setbits_le32(SUNXI_SRAMC_BASE + 0x24, (1 << 15)); - version = readl(SUNXI_SRAMC_BASE + 0x24) >> 16; - clrbits_le32(SUNXI_SRAMC_BASE + 0x24, (1 << 15)); - - /* - * Ideally this would be a switch case, but we do not know exactly - * which versions there are and which version needs which settings, - * so reproduce the per SoC code from the BSP. - */ -#if defined CONFIG_MACH_SUN8I_A23 - if (version == 0x1650) - setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0x1800); - else /* 0x1661 ? */ - setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0xc0); -#elif defined CONFIG_MACH_SUN8I_A33 - if (version != 0x1667) - setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0xc0); -#endif - /* A83T BSP never modifies SUNXI_SRAMC_BASE + 0x44 */ - /* No H3 BSP, boot0 seems to not modify SUNXI_SRAMC_BASE + 0x44 */ -#endif }
#define SUNXI_INVALID_BOOT_SOURCE -1 @@ -312,8 +280,14 @@ u32 spl_boot_device(void) return sunxi_get_boot_device(); }
+__weak void sunxi_sram_init(void) +{ +} + void board_init_f(ulong dummy) { + sunxi_sram_init(); + #if defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I_H3 /* Enable non-secure access to some peripherals */ tzpc_init();