diff options
Diffstat (limited to 'src/northbridge/intel/sandybridge/raminit_native.c')
| -rw-r--r-- | src/northbridge/intel/sandybridge/raminit_native.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/northbridge/intel/sandybridge/raminit_native.c b/src/northbridge/intel/sandybridge/raminit_native.c index 99c1a4c4ff..832391f72e 100644 --- a/src/northbridge/intel/sandybridge/raminit_native.c +++ b/src/northbridge/intel/sandybridge/raminit_native.c @@ -5,7 +5,10 @@ #include <console/console.h> #include <console/usb.h> #include <delay.h> +#include <device/device.h> +#include <device/pci_def.h> #include <device/pci_ops.h> +#include <northbridge/intel/sandybridge/chip.h> #include "raminit_native.h" #include "raminit_common.h" #include "raminit_tables.h" @@ -174,6 +177,78 @@ static void normalize_tclk(ramctr_timing *ctrl, bool ref_100mhz_support) } } +#define DEFAULT_TCK TCK_800MHZ + +static unsigned int get_mem_min_tck(void) +{ + u32 reg32; + u8 rev; + const struct northbridge_intel_sandybridge_config *cfg = NULL; + + /* Actually, config of MCH or Host Bridge */ + cfg = config_of_soc(); + + /* If non-zero, it was set in the devicetree */ + if (cfg->max_mem_clock_mhz) { + + if (cfg->max_mem_clock_mhz >= 1066) + return TCK_1066MHZ; + + else if (cfg->max_mem_clock_mhz >= 933) + return TCK_933MHZ; + + else if (cfg->max_mem_clock_mhz >= 800) + return TCK_800MHZ; + + else if (cfg->max_mem_clock_mhz >= 666) + return TCK_666MHZ; + + else if (cfg->max_mem_clock_mhz >= 533) + return TCK_533MHZ; + + else + return TCK_400MHZ; + } + + if (CONFIG(NATIVE_RAMINIT_IGNORE_MAX_MEM_FUSES)) + return TCK_1333MHZ; + + rev = pci_read_config8(HOST_BRIDGE, PCI_DEVICE_ID); + + if ((rev & BASE_REV_MASK) == BASE_REV_SNB) { + /* Read Capabilities A Register DMFC bits */ + reg32 = pci_read_config32(HOST_BRIDGE, CAPID0_A); + reg32 &= 0x7; + + switch (reg32) { + case 7: return TCK_533MHZ; + case 6: return TCK_666MHZ; + case 5: return TCK_800MHZ; + /* Reserved */ + default: + break; + } + } else { + /* Read Capabilities B Register DMFC bits */ + reg32 = pci_read_config32(HOST_BRIDGE, CAPID0_B); + reg32 = (reg32 >> 4) & 0x7; + + switch (reg32) { + case 7: return TCK_533MHZ; + case 6: return TCK_666MHZ; + case 5: return TCK_800MHZ; + case 4: return TCK_933MHZ; + case 3: return TCK_1066MHZ; + case 2: return TCK_1200MHZ; + case 1: return TCK_1333MHZ; + /* Reserved */ + default: + break; + } + } + return DEFAULT_TCK; +} + static void find_cas_tck(ramctr_timing *ctrl) { u8 val; @@ -188,6 +263,8 @@ static void find_cas_tck(ramctr_timing *ctrl) printk(BIOS_DEBUG, "PLL_REF100_CFG value: 0x%x\n", ref_100mhz_support); + ctrl->tCK = get_mem_min_tck(); + /* Find CAS latency */ while (1) { /* |