diff options
Diffstat (limited to 'arch/riscv/cpu/jh7110/dram.c')
-rw-r--r-- | arch/riscv/cpu/jh7110/dram.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/riscv/cpu/jh7110/dram.c b/arch/riscv/cpu/jh7110/dram.c new file mode 100644 index 0000000000..2ad3f2044a --- /dev/null +++ b/arch/riscv/cpu/jh7110/dram.c @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2022 StarFive Technology Co., Ltd. + * Author: Yanhong Wang <yanhong.wang@starfivetech.com> + */ + +#include <common.h> +#include <fdtdec.h> +#include <init.h> +#include <linux/sizes.h> + +DECLARE_GLOBAL_DATA_PTR; + +int dram_init(void) +{ + return fdtdec_setup_mem_size_base(); +} + +int dram_init_banksize(void) +{ + return fdtdec_setup_memory_banksize(); +} + +phys_size_t board_get_usable_ram_top(phys_size_t total_size) +{ + /* + * Ensure that we run from first 4GB so that all + * addresses used by U-Boot are 32bit addresses. + * + * This in-turn ensures that 32bit DMA capable + * devices work fine because DMA mapping APIs will + * provide 32bit DMA addresses only. + */ + if (IS_ENABLED(CONFIG_64BIT) && gd->ram_top > SZ_4G) + return SZ_4G; + + return gd->ram_top; +} |