Taken from coreboot's src/soc/rockchip/rk3288/sdram.c
Without this change, my u-boot build for the asus c201 chromebook (4GiB) is incorrectly detected as 0 Bytes of ram.
Signed-off-by: Marty E. Plummer hanetzer@startmail.com --- arch/arm/mach-rockchip/sdram_common.c | 62 ++++++++++++++++----------- 1 file changed, 37 insertions(+), 25 deletions(-)
diff --git a/arch/arm/mach-rockchip/sdram_common.c b/arch/arm/mach-rockchip/sdram_common.c index 76dbdc8715..a9c9f970a4 100644 --- a/arch/arm/mach-rockchip/sdram_common.c +++ b/arch/arm/mach-rockchip/sdram_common.c @@ -10,6 +10,8 @@ #include <asm/io.h> #include <asm/arch/sdram_common.h> #include <dm/uclass-internal.h> +#include <linux/kernel.h> +#include <linux/sizes.h>
DECLARE_GLOBAL_DATA_PTR; size_t rockchip_sdram_size(phys_addr_t reg) @@ -19,34 +21,44 @@ size_t rockchip_sdram_size(phys_addr_t reg) size_t size_mb = 0; u32 ch;
- u32 sys_reg = readl(reg); - u32 ch_num = 1 + ((sys_reg >> SYS_REG_NUM_CH_SHIFT) - & SYS_REG_NUM_CH_MASK); + if (!size_mb) {
- debug("%s %x %x\n", __func__, (u32)reg, sys_reg); - for (ch = 0; ch < ch_num; ch++) { - rank = 1 + (sys_reg >> SYS_REG_RANK_SHIFT(ch) & - SYS_REG_RANK_MASK); - col = 9 + (sys_reg >> SYS_REG_COL_SHIFT(ch) & SYS_REG_COL_MASK); - bk = 3 - ((sys_reg >> SYS_REG_BK_SHIFT(ch)) & SYS_REG_BK_MASK); - cs0_row = 13 + (sys_reg >> SYS_REG_CS0_ROW_SHIFT(ch) & - SYS_REG_CS0_ROW_MASK); - cs1_row = 13 + (sys_reg >> SYS_REG_CS1_ROW_SHIFT(ch) & - SYS_REG_CS1_ROW_MASK); - bw = (2 >> ((sys_reg >> SYS_REG_BW_SHIFT(ch)) & - SYS_REG_BW_MASK)); - row_3_4 = sys_reg >> SYS_REG_ROW_3_4_SHIFT(ch) & - SYS_REG_ROW_3_4_MASK; + u32 sys_reg = readl(reg); + u32 ch_num = 1 + ((sys_reg >> SYS_REG_NUM_CH_SHIFT) + & SYS_REG_NUM_CH_MASK);
- chipsize_mb = (1 << (cs0_row + col + bk + bw - 20)); + debug("%s %x %x\n", __func__, (u32)reg, sys_reg); + for (ch = 0; ch < ch_num; ch++) { + rank = 1 + (sys_reg >> SYS_REG_RANK_SHIFT(ch) & + SYS_REG_RANK_MASK); + col = 9 + (sys_reg >> SYS_REG_COL_SHIFT(ch) & SYS_REG_COL_MASK); + bk = 3 - ((sys_reg >> SYS_REG_BK_SHIFT(ch)) & SYS_REG_BK_MASK); + cs0_row = 13 + (sys_reg >> SYS_REG_CS0_ROW_SHIFT(ch) & + SYS_REG_CS0_ROW_MASK); + cs1_row = 13 + (sys_reg >> SYS_REG_CS1_ROW_SHIFT(ch) & + SYS_REG_CS1_ROW_MASK); + bw = (2 >> ((sys_reg >> SYS_REG_BW_SHIFT(ch)) & + SYS_REG_BW_MASK)); + row_3_4 = sys_reg >> SYS_REG_ROW_3_4_SHIFT(ch) & + SYS_REG_ROW_3_4_MASK;
- if (rank > 1) - chipsize_mb += chipsize_mb >> (cs0_row - cs1_row); - if (row_3_4) - chipsize_mb = chipsize_mb * 3 / 4; - size_mb += chipsize_mb; - debug("rank %d col %d bk %d cs0_row %d bw %d row_3_4 %d\n", - rank, col, bk, cs0_row, bw, row_3_4); + chipsize_mb = (1 << (cs0_row + col + bk + bw - 20)); + + if (rank > 1) + chipsize_mb += chipsize_mb >> (cs0_row - cs1_row); + if (row_3_4) + chipsize_mb = chipsize_mb * 3 / 4; + size_mb += chipsize_mb; + debug("rank %d col %d bk %d cs0_row %d bw %d row_3_4 %d\n", + rank, col, bk, cs0_row, bw, row_3_4); + } + + /* + * we use the 0x00000000~0xfeffffff space + * since 0xff000000~0xffffffff is soc register space + * so we reserve it + */ + size_mb = min(size_mb, 0xff000000/SZ_1M); }
return (size_t)size_mb << 20;