Patrick Georgi (pgeorgi@google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9783
-gerrit
commit 5e390181070ba99759ee17d167567cce1370b627 Author: Duncan Laurie dlaurie@chromium.org Date: Tue Feb 24 10:51:04 2015 -0800
broadwell: Set C9/C10 vccmin
This is done via a PCODE mailbox write.
BUG=chrome-os-partner:37043 BRANCH=broadwell TEST=build and boot on samus
Change-Id: I95e8fe3e28eec76d6b5b488a0c770c04f408700e Signed-off-by: Patrick Georgi pgeorgi@chromium.org Original-Commit-Id: b90bef7f708b1ce83f6e124f4b38ae51ec6b0597 Original-Change-Id: I95cd4c17db672a53ba05f85ba5fa7bc866af1543 Original-Signed-off-by: Duncan Laurie dlaurie@chromium.org Original-Reviewed-on: https://chromium-review.googlesource.com/252862 Original-Reviewed-by: Alec Berg alecaberg@chromium.org Original-Reviewed-by: Shawn N shawnn@chromium.org (cherry picked from commit ab6b4bddf3365713aa40d194c2dbd3e59985f00d) Original-Reviewed-on: https://chromium-review.googlesource.com/252883 --- src/soc/intel/broadwell/cpu.c | 23 +++++++++++++++++++++++ src/soc/intel/broadwell/include/soc/systemagent.h | 2 ++ 2 files changed, 25 insertions(+)
diff --git a/src/soc/intel/broadwell/cpu.c b/src/soc/intel/broadwell/cpu.c index 9073241..984ff76 100644 --- a/src/soc/intel/broadwell/cpu.c +++ b/src/soc/intel/broadwell/cpu.c @@ -178,6 +178,26 @@ static u32 pcode_mailbox_read(u32 command) return MCHBAR32(BIOS_MAILBOX_DATA); }
+static int pcode_mailbox_write(u32 command, u32 data) +{ + if (pcode_ready() < 0) { + printk(BIOS_ERR, "PCODE: mailbox timeout on wait ready.\n"); + return -1; + } + + MCHBAR32(BIOS_MAILBOX_DATA) = data; + + /* Send command and start transaction */ + MCHBAR32(BIOS_MAILBOX_INTERFACE) = command | MAILBOX_RUN_BUSY; + + if (pcode_ready() < 0) { + printk(BIOS_ERR, "PCODE: mailbox timeout on completion.\n"); + return -1; + } + + return 0; +} + static void initialize_vr_config(void) { device_t dev = SA_DEV_ROOT; @@ -238,6 +258,9 @@ static void initialize_vr_config(void) else msr.lo |= 0x006f; /* 1.60V */ wrmsr(MSR_VR_MISC_CONFIG2, msr); + + /* Set C9/C10 VCC Min */ + pcode_mailbox_write(MAILBOX_BIOS_CMD_WRITE_C9C10_VOLTAGE, 0x1f1f); }
static void configure_pch_power_sharing(void) diff --git a/src/soc/intel/broadwell/include/soc/systemagent.h b/src/soc/intel/broadwell/include/soc/systemagent.h index 5142b09..325a4a5 100644 --- a/src/soc/intel/broadwell/include/soc/systemagent.h +++ b/src/soc/intel/broadwell/include/soc/systemagent.h @@ -115,6 +115,8 @@ #define MAILBOX_BIOS_CMD_FSM_MEASURE_INTVL 0x909 #define MAILBOX_BIOS_CMD_READ_PCH_POWER 0xa #define MAILBOX_BIOS_CMD_READ_PCH_POWER_EXT 0xb +#define MAILBOX_BIOS_CMD_READ_C9C10_VOLTAGE 0x26 +#define MAILBOX_BIOS_CMD_WRITE_C9C10_VOLTAGE 0x27 /* Errors are returned back in bits 7:0. */ #define MAILBOX_BIOS_ERROR_NONE 0 #define MAILBOX_BIOS_ERROR_INVALID_COMMAND 1