diff options
| author | Patrick Rudolph <siro@das-labor.org> | 2016-11-24 19:40:23 +0100 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2017-04-04 18:49:47 +0200 |
| commit | cab4d3df3924c7679286e4048ada056b02cc3fa1 (patch) | |
| tree | 6a6762a8b4c9b8f22cd2143a3cc0582ceb961633 /src/northbridge | |
| parent | 77eaba3618aa2c67c0ee21afb26d6422de67f035 (diff) | |
nb/intel/sandybridge/raminit: Add 100MHz refclock support
Add support for 100MHz reference clock on ivybridge.
Allows to use more frequencies than sandybridge.
Tested on Lenovo T430 (Intel IvyBridge) on DDR3-1800.
Change-Id: I780d34ded2c1e3737ae1af685c8c2da832842e7c
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/17607
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/northbridge')
| -rw-r--r-- | src/northbridge/intel/sandybridge/raminit_ivy.c | 43 |
1 files changed, 40 insertions, 3 deletions
diff --git a/src/northbridge/intel/sandybridge/raminit_ivy.c b/src/northbridge/intel/sandybridge/raminit_ivy.c index cee7eddfb8..5cdfe8971b 100644 --- a/src/northbridge/intel/sandybridge/raminit_ivy.c +++ b/src/northbridge/intel/sandybridge/raminit_ivy.c @@ -19,6 +19,8 @@ #include <console/usb.h> #include <cpu/x86/msr.h> #include <delay.h> +#include <arch/io.h> +#include <device/pci_ops.h> #include "raminit_native.h" #include "raminit_common.h" @@ -429,14 +431,20 @@ static void dram_timing(ramctr_timing * ctrl) static void dram_freq(ramctr_timing * ctrl) { + bool ref_100mhz_support; + u32 reg32; + if (ctrl->tCK > TCK_400MHZ) { printk (BIOS_ERR, "DRAM frequency is under lowest supported " "frequency (400 MHz). Increasing to 400 MHz as last resort"); ctrl->tCK = TCK_400MHZ; } - /* TODO: implement 100Mhz refclock */ - ctrl->base_freq = 133; + /* 100 Mhz reference clock supported */ + reg32 = pci_read_config32(PCI_DEV(0, 0, 0), CAPID0_B); + ref_100mhz_support = !!((reg32 >> 21) & 0x7); + printk(BIOS_DEBUG, "100MHz reference clock support: %s\n", + ref_100mhz_support ? "yes" : "no"); while (1) { u8 val2; @@ -444,22 +452,49 @@ static void dram_freq(ramctr_timing * ctrl) /* Step 1 - Set target PCU frequency */ - if (ctrl->tCK <= TCK_1066MHZ) { + if (ctrl->tCK <= TCK_1200MHZ) { + ctrl->tCK = TCK_1200MHZ; + ctrl->base_freq = 100; + } else if (ctrl->tCK <= TCK_1100MHZ) { + ctrl->tCK = TCK_1100MHZ; + ctrl->base_freq = 100; + } else if (ctrl->tCK <= TCK_1066MHZ) { ctrl->tCK = TCK_1066MHZ; + ctrl->base_freq = 133; + } else if (ctrl->tCK <= TCK_1000MHZ) { + ctrl->tCK = TCK_1000MHZ; + ctrl->base_freq = 100; } else if (ctrl->tCK <= TCK_933MHZ) { ctrl->tCK = TCK_933MHZ; + ctrl->base_freq = 133; + } else if (ctrl->tCK <= TCK_900MHZ) { + ctrl->tCK = TCK_900MHZ; + ctrl->base_freq = 100; } else if (ctrl->tCK <= TCK_800MHZ) { ctrl->tCK = TCK_800MHZ; + ctrl->base_freq = 133; + } else if (ctrl->tCK <= TCK_700MHZ) { + ctrl->tCK = TCK_700MHZ; + ctrl->base_freq = 100; } else if (ctrl->tCK <= TCK_666MHZ) { ctrl->tCK = TCK_666MHZ; + ctrl->base_freq = 133; } else if (ctrl->tCK <= TCK_533MHZ) { ctrl->tCK = TCK_533MHZ; + ctrl->base_freq = 133; } else if (ctrl->tCK <= TCK_400MHZ) { ctrl->tCK = TCK_400MHZ; + ctrl->base_freq = 133; } else { die ("No lock frequency found"); } + if (!ref_100mhz_support && ctrl->base_freq == 100) { + /* Skip unsupported frequency. */ + ctrl->tCK++; + continue; + } + /* Frequency multiplier. */ u32 FRQ = get_FRQ(ctrl->tCK, ctrl->base_freq); @@ -473,6 +508,8 @@ static void dram_freq(ramctr_timing * ctrl) /* Step 2 - Select frequency in the MCU */ reg1 = FRQ; + if (ctrl->base_freq == 100) + reg1 |= 0x100; /* Enable 100Mhz REF clock */ reg1 |= 0x80000000; // set running bit MCHBAR32(MC_BIOS_REQ) = reg1; int i=0; |