From b61e06156660579ea6e248abd2506ebdd85e7a14 Mon Sep 17 00:00:00 2001 From: York Sun Date: Tue, 25 Jun 2013 11:37:47 -0700 Subject: powerpc/mpc8xxx: Add x4 DDR device support On selected platforms, x4 DDR devices can be supported. Using x4 devices may lower the performance, but generally they are available for higher density. Tested on MT36JSF2G72PZ-1G9E1 RDIMM. Signed-off-by: York Sun --- arch/powerpc/include/asm/fsl_ddr_sdram.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/powerpc/include/asm/fsl_ddr_sdram.h') diff --git a/arch/powerpc/include/asm/fsl_ddr_sdram.h b/arch/powerpc/include/asm/fsl_ddr_sdram.h index 640d3297d6c..bac22fcd1d0 100644 --- a/arch/powerpc/include/asm/fsl_ddr_sdram.h +++ b/arch/powerpc/include/asm/fsl_ddr_sdram.h @@ -277,6 +277,7 @@ typedef struct memctl_options_s { unsigned int mirrored_dimm; unsigned int quad_rank_present; unsigned int ap_en; /* address parity enable for RDIMM */ + unsigned int x4_en; /* enable x4 devices */ /* Global Timing Parameters */ unsigned int cas_latency_override; -- cgit v1.2.3 From c63e137014cf148bc1d234128941dccee3d519ae Mon Sep 17 00:00:00 2001 From: York Sun Date: Tue, 25 Jun 2013 11:37:48 -0700 Subject: powerpc/mpc8xxx: Add memory reset control JEDEC spec requires the clocks to be stable before deasserting reset signal for RDIMMs. Clocks start when any chip select is enabled and clock control register is set. This patch also adds the interface to toggle memory reset signal if needed by the boards. Signed-off-by: York Sun --- arch/powerpc/include/asm/fsl_ddr_sdram.h | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) (limited to 'arch/powerpc/include/asm/fsl_ddr_sdram.h') diff --git a/arch/powerpc/include/asm/fsl_ddr_sdram.h b/arch/powerpc/include/asm/fsl_ddr_sdram.h index bac22fcd1d0..f4eec82d5d3 100644 --- a/arch/powerpc/include/asm/fsl_ddr_sdram.h +++ b/arch/powerpc/include/asm/fsl_ddr_sdram.h @@ -331,9 +331,31 @@ extern phys_size_t fsl_ddr_sdram(void); extern phys_size_t fsl_ddr_sdram_size(void); extern int fsl_use_spd(void); extern void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, - unsigned int ctrl_num); + unsigned int ctrl_num, int step); u32 fsl_ddr_get_intl3r(void); +static void __board_assert_mem_reset(void) +{ +} + +static void __board_deassert_mem_reset(void) +{ +} + +void board_assert_mem_reset(void) + __attribute__((weak, alias("__board_assert_mem_reset"))); + +void board_deassert_mem_reset(void) + __attribute__((weak, alias("__board_deassert_mem_reset"))); + +static int __board_need_mem_reset(void) +{ + return 0; +} + +int board_need_mem_reset(void) + __attribute__((weak, alias("__board_need_mem_reset"))); + /* * The 85xx boards have a common prototype for fixed_sdram so put the * declaration here. -- cgit v1.2.3