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rockchip: sdram: Add rockchip_sdram_type() helper

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Add a helper function based on rockchip_sdram_size() that return what
DRAM type is used on current running board.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Jonas Karlman
2025-08-01 17:09:27 +00:00
committed by Kever Yang
parent e22335a221
commit 57dc75fb9b
2 changed files with 18 additions and 0 deletions
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3
arch/arm/include/asm/arch-rockchip/sdram.h
View File

@@ -87,6 +87,9 @@ enum {
#define SYS_REG_CS1_COL_SHIFT(ch) (0 + (ch) * 2)
#define SYS_REG_CS1_COL_MASK 3
/* Get sdram type decode from reg */
u8 rockchip_sdram_type(phys_addr_t reg);
/* Get sdram size decode from reg */
size_t rockchip_sdram_size(phys_addr_t reg);

15
arch/arm/mach-rockchip/sdram.c
View File

@@ -345,6 +345,21 @@ int dram_init_banksize(void)
return 0;
}
u8 rockchip_sdram_type(phys_addr_t reg)
{
u32 dram_type, version;
u32 sys_reg2 = readl(reg);
u32 sys_reg3 = readl(reg + 4);
dram_type = (sys_reg2 >> SYS_REG_DDRTYPE_SHIFT) & SYS_REG_DDRTYPE_MASK;
version = (sys_reg3 >> SYS_REG_VERSION_SHIFT) & SYS_REG_VERSION_MASK;
if (version >= 3)
dram_type |= ((sys_reg3 >> SYS_REG_EXTEND_DDRTYPE_SHIFT) &
SYS_REG_EXTEND_DDRTYPE_MASK) << 3;
return dram_type;
}
size_t rockchip_sdram_size(phys_addr_t reg)
{
u32 rank, cs0_col, bk, cs0_row, cs1_row, bw, row_3_4;