From eb796cbb69a39eb08b08e1715e21c8034cd349b7 Mon Sep 17 00:00:00 2001 From: Peng Fan Date: Mon, 17 Aug 2015 16:11:04 +0800 Subject: imx: mx6: ddr: add LPDDR2 support Add LPDDR2 support: 1. Implement a function mx6_lpddr2_cfg to initialize MMDC for LPDDR2. 2. Introduce a structure mx6_lpddr2_cfg, most entrys are same to mx6_ddr3_cfg, but still keep it a single one for easy to choose parameters for LPDDR2. 3. If ddr_type is LPDDR2, use mx6_lpddr2_cfg to init MMDC. 4. Update comments. Signed-off-by: Peng Fan Cc: Stefano Babic Cc: Tim Harvey --- arch/arm/include/asm/arch-mx6/mx6-ddr.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'arch/arm/include') diff --git a/arch/arm/include/asm/arch-mx6/mx6-ddr.h b/arch/arm/include/asm/arch-mx6/mx6-ddr.h index 36fcb2b..68d9bda 100644 --- a/arch/arm/include/asm/arch-mx6/mx6-ddr.h +++ b/arch/arm/include/asm/arch-mx6/mx6-ddr.h @@ -377,6 +377,21 @@ struct mx6_ddr3_cfg { u8 SRT; /* self-refresh temperature: 0=normal, 1=extended */ }; +/* Device Information: Varies per LPDDR2 part number and speed grade */ +struct mx6_lpddr2_cfg { + u16 mem_speed; /* ie 800 for LPDDR2-800 */ + u8 density; /* chip density (Gb) (1,2,4,8) */ + u8 width; /* bus width (bits) (4,8,16) */ + u8 banks; /* number of banks */ + u8 rowaddr; /* row address bits (11-16)*/ + u8 coladdr; /* col address bits (9-12) */ + u16 trcd_lp; + u16 trppb_lp; + u16 trpab_lp; + u16 trcmin; /* tRC min (ns*100) */ + u16 trasmin; /* tRAS min (ns*100) */ +}; + /* System Information: Varies per board design, layout, and term choices */ struct mx6_ddr_sysinfo { u8 dsize; /* size of bus (in dwords: 0=16bit,1=32bit,2=64bit) */ -- cgit v1.1