From d28cb6714216cc9e6bfdc1fa333d5dcd174207bd Mon Sep 17 00:00:00 2001 From: York Sun Date: Fri, 5 Sep 2014 13:52:41 +0800 Subject: driver/ddr/freescale: Add support of accumulate ECC If less than 8 ECC pins are used for DDR data bus width smaller than 64 bits, the 8-bit ECC code will be transmitted/received across several beats, and it will be used to check 64-bits of data once 8-bits of ECC are accumulated. Signed-off-by: York Sun --- drivers/ddr/fsl/ctrl_regs.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/ddr/fsl/ctrl_regs.c') diff --git a/drivers/ddr/fsl/ctrl_regs.c b/drivers/ddr/fsl/ctrl_regs.c index 04e4178..5e0ee77 100644 --- a/drivers/ddr/fsl/ctrl_regs.c +++ b/drivers/ddr/fsl/ctrl_regs.c @@ -693,6 +693,7 @@ static void set_ddr_sdram_cfg(fsl_ddr_cfg_regs_t *ddr, unsigned int x32_en = 0; /* x32 enable */ unsigned int pchb8 = 0; /* precharge bit 8 enable */ unsigned int hse; /* Global half strength override */ + unsigned int acc_ecc_en = 0; /* Accumulated ECC enable */ unsigned int mem_halt = 0; /* memory controller halt */ unsigned int bi = 0; /* Bypass initialization */ @@ -736,6 +737,9 @@ static void set_ddr_sdram_cfg(fsl_ddr_cfg_regs_t *ddr, ba_intlv_ctl = popts->ba_intlv_ctl; hse = popts->half_strength_driver_enable; + /* set when ddr bus width < 64 */ + acc_ecc_en = (dbw != 0 && ecc_en == 1) ? 1 : 0; + ddr->ddr_sdram_cfg = (0 | ((mem_en & 0x1) << 31) | ((sren & 0x1) << 30) @@ -752,6 +756,7 @@ static void set_ddr_sdram_cfg(fsl_ddr_cfg_regs_t *ddr, | ((x32_en & 0x1) << 5) | ((pchb8 & 0x1) << 4) | ((hse & 0x1) << 3) + | ((acc_ecc_en & 0x1) << 2) | ((mem_halt & 0x1) << 1) | ((bi & 0x1) << 0) ); -- cgit v1.1 From ef87cab66492fe530bb6ec2e499b030c5ae60286 Mon Sep 17 00:00:00 2001 From: York Sun Date: Fri, 5 Sep 2014 13:52:43 +0800 Subject: driver/ddr/fsl: Add support of overriding chip select write leveling JEDEC spec allows DRAM vendors to use prime DQ for write leveling. This is not an issue unless some DQ pins are not connected. If a platform uses regular DIMMs but with reduced DDR ECC pins, the prime DQ may end up on those floating pins for the second rank. The workaround is to use a known good chip select for this purpose. Signed-off-by: York Sun --- drivers/ddr/fsl/ctrl_regs.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/ddr/fsl/ctrl_regs.c') diff --git a/drivers/ddr/fsl/ctrl_regs.c b/drivers/ddr/fsl/ctrl_regs.c index 5e0ee77..d9cac22 100644 --- a/drivers/ddr/fsl/ctrl_regs.c +++ b/drivers/ddr/fsl/ctrl_regs.c @@ -2276,6 +2276,9 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts, if (ip_rev > 0x40400) unq_mrs_en = 1; + if (ip_rev > 0x40700) + ddr->debug[18] = popts->cswl_override; + set_ddr_sdram_cfg_2(ddr, popts, unq_mrs_en); set_ddr_sdram_mode(ddr, popts, common_dimm, cas_latency, additive_latency, unq_mrs_en); -- cgit v1.1