diff options
Diffstat (limited to 'src/soc/rockchip/rk3399/sdram.c')
| -rw-r--r-- | src/soc/rockchip/rk3399/sdram.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/src/soc/rockchip/rk3399/sdram.c b/src/soc/rockchip/rk3399/sdram.c index d085e4c44e..e51cd8968d 100644 --- a/src/soc/rockchip/rk3399/sdram.c +++ b/src/soc/rockchip/rk3399/sdram.c @@ -1031,5 +1031,41 @@ void sdram_init(const struct rk3399_sdram_params *sdram_params) size_t sdram_size_mb(void) { - return CONFIG_DRAM_SIZE_MB; + u32 rank, col, bk, cs0_row, cs1_row, bw, row_3_4; + size_t chipsize_mb = 0; + static size_t size_mb = 0; + u32 ch; + + if (!size_mb) { + u32 sys_reg = read32(&rk3399_pmugrf->os_reg2); + u32 ch_num = SYS_REG_DEC_NUM_CH(sys_reg); + + for (ch = 0; ch < ch_num; ch++) { + rank = SYS_REG_DEC_RANK(sys_reg, ch); + col = SYS_REG_DEC_COL(sys_reg, ch); + bk = SYS_REG_DEC_BK(sys_reg, ch); + cs0_row = SYS_REG_DEC_CS0_ROW(sys_reg, ch); + cs1_row = SYS_REG_DEC_CS1_ROW(sys_reg, ch); + bw = SYS_REG_DEC_BW(sys_reg, ch); + row_3_4 = SYS_REG_DEC_ROW_3_4(sys_reg, ch); + + 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; + } + + /* + * we use the 0x00000000~0xf7ffffff space + * since 0xf8000000~0xffffffff is soc register space + * so we reserve it + */ + size_mb = MIN(size_mb, 0xf8000000/MiB); + } + + return size_mb; } |