From 42609d807ba598fc09035717c32f04aa9b0e73c3 Mon Sep 17 00:00:00 2001 From: Patrick Rudolph Date: Mon, 27 Jul 2020 16:23:36 +0200 Subject: nb/intel/*: Fill in SMBIOS type 16 on SNB/HSW Fill in the maximum DRAM capacity and slot count read from CAPID0_A registers on Sandy Bridge and Haswell. While the register isn't part of the Core Series datasheet, it can be found in the corresponding "Intel Open Source Graphics Programmer's Reference" datasheets. Note that the values for DDRSZ (maximum allowed memory size per channel) need to be halved when only one DIMM per channel is supported. On mobile platforms, all but quad-core processors are subject to this restriction. Tested on Lenovo X230: On Linux, verify that `dmidecode -t 16` reports the actual maximum capacity (16 GiB) instead of the currently-installed capacity (4 GiB) or the max capacity assuming two DIMMs per channel is possible (32 GiB). Change-Id: I6e2346de1ffe52e8685276acbdbf25755f4cc162 Signed-off-by: Patrick Rudolph Signed-off-by: Angel Pons Reviewed-on: https://review.coreboot.org/c/coreboot/+/43971 Tested-by: build bot (Jenkins) Reviewed-by: Christian Walter --- .../intel/sandybridge/hostbridge_regs.h | 5 ++ src/northbridge/intel/sandybridge/raminit.c | 58 ++++++++++++++++++++-- 2 files changed, 60 insertions(+), 3 deletions(-) (limited to 'src/northbridge/intel/sandybridge') diff --git a/src/northbridge/intel/sandybridge/hostbridge_regs.h b/src/northbridge/intel/sandybridge/hostbridge_regs.h index 00d37d4a6d..2d2fcff3b1 100644 --- a/src/northbridge/intel/sandybridge/hostbridge_regs.h +++ b/src/northbridge/intel/sandybridge/hostbridge_regs.h @@ -49,6 +49,11 @@ #define TOLUD 0xbc /* Top of Low Used Memory */ #define CAPID0_A 0xe4 /* Capabilities Register A */ +#define CAPID_ECCDIS (1 << 25) +#define CAPID_DDPCD (1 << 14) +#define CAPID_PDCD (1 << 12) +#define CAPID_DDRSZ(x) (((x) >> 19) & 0x3) + #define CAPID0_B 0xe8 /* Capabilities Register B */ #define SKPAD 0xdc /* Scratchpad Data */ diff --git a/src/northbridge/intel/sandybridge/raminit.c b/src/northbridge/intel/sandybridge/raminit.c index 422067b5d2..2728037ac9 100644 --- a/src/northbridge/intel/sandybridge/raminit.c +++ b/src/northbridge/intel/sandybridge/raminit.c @@ -54,8 +54,47 @@ static void disable_channel(ramctr_timing *ctrl, int channel) memset(&ctrl->info.dimm[channel][0], 0, sizeof(ctrl->info.dimm[0])); } -/* Fill cbmem with information for SMBIOS type 17 */ -static void fill_smbios17(ramctr_timing *ctrl) +static bool nb_supports_ecc(const uint32_t capid0_a) +{ + return !(capid0_a & CAPID_ECCDIS); +} + +static uint16_t nb_slots_per_channel(const uint32_t capid0_a) +{ + return !(capid0_a & CAPID_DDPCD) + 1; +} + +static uint16_t nb_number_of_channels(const uint32_t capid0_a) +{ + return !(capid0_a & CAPID_PDCD) + 1; +} + +static uint32_t nb_max_chan_capacity_mib(const uint32_t capid0_a) +{ + uint32_t ddrsz; + + /* Values from documentation, which assume two DIMMs per channel */ + switch (CAPID_DDRSZ(capid0_a)) { + case 1: + ddrsz = 8192; + break; + case 2: + ddrsz = 2048; + break; + case 3: + ddrsz = 512; + break; + default: + ddrsz = 16384; + break; + } + + /* Account for the maximum number of DIMMs per channel */ + return (ddrsz / 2) * nb_slots_per_channel(capid0_a); +} + +/* Fill cbmem with information for SMBIOS type 16 and type 17 */ +static void setup_sdram_meminfo(ramctr_timing *ctrl) { int channel, slot; const u16 ddr_freq = (1000 << 8) / ctrl->tCK; @@ -66,6 +105,19 @@ static void fill_smbios17(ramctr_timing *ctrl) if (ret != CB_SUCCESS) printk(BIOS_ERR, "RAMINIT: Failed to add SMBIOS17\n"); } + + /* The 'spd_add_smbios17' function allocates this CBMEM area */ + struct memory_info *m = cbmem_find(CBMEM_ID_MEMINFO); + if (m == NULL) + return; + + const uint32_t capid0_a = pci_read_config32(HOST_BRIDGE, CAPID0_A); + + const uint16_t channels = nb_number_of_channels(capid0_a); + + m->ecc_capable = nb_supports_ecc(capid0_a); + m->max_capacity_mib = channels * nb_max_chan_capacity_mib(capid0_a); + m->number_of_devices = channels * nb_slots_per_channel(capid0_a); } /* Return CRC16 match for all SPDs */ @@ -386,7 +438,7 @@ static void init_dram_ddr3(int s3resume, const u32 cpuid) } if (!s3resume) - fill_smbios17(&ctrl); + setup_sdram_meminfo(&ctrl); } void perform_raminit(int s3resume) -- cgit v1.2.3