Implement functionality to probe and calculate the DRAM size during the boot phase for the RISC-V spacemit K1 platform.
Tested-by: Marcel Ziswiler <mar...@ziswiler.com> # BPI-F3 16G Signed-off-by: Huan Zhou <m...@per1cycle.org> --- This patch introduce improvement for get dram size on spacemit k1 platform, retrieving the dram size dynamically. Have tested on Licheepi LPI3A 8G[1]. Links: [1] https://gist.github.com/per1cycle/e4eab66ebb6f83fe5118e823367fce28 . Changes in v5: - Fix the dummy typo. - Link to v4: https://lore.kernel.org/r/20250120-get-dram-size-v4-1-e74103e36...@per1cycle.org Changes in v4: - shorten the commit message. - More proper way for `map_format_size` -> `ddr_map_size` - Link to v3: https://lore.kernel.org/r/20250114-get-dram-size-v3-1-83d5f8815...@per1cycle.org Changes in v3: - Remove the inline attr in arch/riscv/cpu/k1/dram.c map_format_size(). - Add detailed commit message. - Link to v2: https://lore.kernel.org/r/20250114-get-dram-size-v2-1-aba5a281e...@per1cycle.org Changes in v2: - Fix bracker and return type in map_format_size() function. - Add test log in the cover letter.. - Link to v1: https://lore.kernel.org/r/20250108-get-dram-size-v1-1-4bae32ecf...@per1cycle.org --- arch/riscv/cpu/k1/dram.c | 40 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) diff --git a/arch/riscv/cpu/k1/dram.c b/arch/riscv/cpu/k1/dram.c index c477c15cbfb19f0e3a0ee72985b602f5bda352d7..cc1e903c9dd6ed79796730c25b2d365ba102ad75 100644 --- a/arch/riscv/cpu/k1/dram.c +++ b/arch/riscv/cpu/k1/dram.c @@ -4,17 +4,53 @@ */ #include <asm/global_data.h> +#include <asm/io.h> #include <config.h> +#include <bitfield.h> #include <fdt_support.h> #include <linux/sizes.h> +#define DDR_BASE 0xC0000000 DECLARE_GLOBAL_DATA_PTR; +static phys_size_t ddr_map_size(u32 val) +{ + u32 tmp; + + if (!(val & 0x1)) + return 0; + + tmp = bitfield_extract(val, 16, 5); + switch (tmp) { + case 0xd: + return 512; + case 0xe: + return 1024; + case 0xf: + return 2048; + case 0x10: + return 4096; + case 0x11: + return 8192; + default: + pr_info("Invalid DRAM density %x\n", val); + return 0; + } +} + +phys_size_t ddr_get_density(void) +{ + phys_size_t cs0_size = ddr_map_size(readl((void *)DDR_BASE + 0x200)); + phys_size_t cs1_size = ddr_map_size(readl((void *)DDR_BASE + 0x208)); + phys_size_t ddr_size = cs0_size + cs1_size; + + return ddr_size; +} + int dram_init(void) { gd->ram_base = CFG_SYS_SDRAM_BASE; - /* TODO get ram size from ddr controller */ - gd->ram_size = SZ_4G; + gd->ram_size = ddr_get_density() * SZ_1M; return 0; } --- base-commit: 19fc0b7f7d907119a13e9c207991899f0817f8fc change-id: 20250108-get-dram-size-65cf59a15201 Best regards, -- Huan Zhou <m...@per1cycle.org>
