[PATCH v2 1/2] rockchip: sdram: Add rockchip_sdram_type() helper

[Kever Yang]

On 2025/8/2 01:09, Jonas Karlman wrote:
> 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 at kwiboo.se>
Reviewed-by: Kever Yang <kever.yang at rock-chips.com>

Thanks,
- Kever
> ---
> v2: New patch
> ---
>   arch/arm/include/asm/arch-rockchip/sdram.h |  3 +++
>   arch/arm/mach-rockchip/sdram.c             | 15 +++++++++++++++
>   2 files changed, 18 insertions(+)
>
> diff --git a/arch/arm/include/asm/arch-rockchip/sdram.h b/arch/arm/include/asm/arch-rockchip/sdram.h
> index 4fb45ac5c76e..476fc1c4ee33 100644
> --- a/arch/arm/include/asm/arch-rockchip/sdram.h
> +++ b/arch/arm/include/asm/arch-rockchip/sdram.h
> @@ -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);
>   
> diff --git a/arch/arm/mach-rockchip/sdram.c b/arch/arm/mach-rockchip/sdram.c
> index 3bc482331c7e..d560f90e873d 100644
> --- a/arch/arm/mach-rockchip/sdram.c
> +++ b/arch/arm/mach-rockchip/sdram.c
> @@ -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;