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haswell: VR controller configuration 

Configure the VR controller. This enables the PSIx levels
as well as C-state ramping. PSIx thresholds are:
 - PSI3: 1A.
 - PSI2: 5A.
 - PSI1: 15A.

Before:
0x601 0x0000000000000100
0x603 0x0036000000262626
0x636 0x000000000000006f
After:
0x601 0x4010140f00000100
0x603 0x0036000000262626
0x636 0x000000000000006f

Change-Id: I6958845ac4164ebd0f1bb2d6d9be55ba63ed9344
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/60931
Reviewed-by: Sameer Nanda <snanda@chromium.org>
Reviewed-on: http://review.coreboot.org/4338
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
This commit is contained in:
Aaron Durbin 2013-07-03 16:21:28 -05:00 committed by Alexandru Gagniuc
parent 01ab2d14be
commit 16cbf8983c
2 changed files with 55 additions and 0 deletions
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2
src/cpu/intel/haswell/haswell.h
View File

@ -83,9 +83,11 @@
#define PKG_POWER_LIMIT_TIME_MASK 0x7f
#define MSR_VR_CURRENT_CONFIG 0x601
#define MSR_VR_MISC_CONFIG 0x603
#define MSR_PKG_POWER_SKU_UNIT 0x606
#define MSR_PKG_POWER_SKU 0x614
#define MSR_DDR_RAPL_LIMIT 0x618
#define MSR_VR_MISC_CONFIG2 0x636
#define MSR_PP0_POWER_LIMIT 0x638
#define MSR_PP1_POWER_LIMIT 0x640

53
src/cpu/intel/haswell/haswell_init.c
View File

@ -293,6 +293,57 @@ static u32 pcode_mailbox_read(u32 command)
return MCHBAR32(BIOS_MAILBOX_DATA);
}
static void initialize_vr_config(void)
{
msr_t msr;
printk(BIOS_DEBUG, "Initializing VR config.\n");
/* Configure VR_CURRENT_CONFIG. */
msr = rdmsr(MSR_VR_CURRENT_CONFIG);
/* Preserve bits 63 and 62. Bit 62 is PSI4 enable, but it is only valid
* on ULT systems. */
msr.hi &= 0xc0000000;
msr.hi |= (0x01 << (52 - 32)); /* PSI3 threshold - 1A. */
msr.hi |= (0x05 << (42 - 32)); /* PSI2 threshold - 5A. */
msr.hi |= (0x0f << (32 - 32)); /* PSI1 threshold - 15A. */
if (is_ult())
msr.hi |= (1 << (62 - 32)); /* Enable PSI4 */
/* Leave the max instantaneous current limit (12:0) to default. */
wrmsr(MSR_VR_CURRENT_CONFIG, msr);
/* Configure VR_MISC_CONFIG MSR. */
msr = rdmsr(MSR_VR_MISC_CONFIG);
/* Set the IOUT_SLOPE scalar applied to dIout in U10.1.9 format. */
msr.hi &= ~(0x3ff << (40 - 32));
msr.hi |= (0x200 << (40 - 32)); /* 1.0 */
/* Set IOUT_OFFSET to 0. */
msr.hi &= ~0xff;
/* Set exit ramp rate to fast. */
msr.hi |= (1 << (50 - 32));
/* Set entry ramp rate to slow. */
msr.hi &= ~(1 << (51 - 32));
/* Enable decay mode on C-state entry. */
msr.hi |= (1 << (52 - 32));
/* Set the slow ramp rate to be fast ramp rate / 4 */
msr.hi &= ~(0x3 << (53 - 32));
msr.hi |= (0x01 << (53 - 32));
/* Set MIN_VID (31:24) to allow CPU to have full control. */
msr.lo &= ~0xff000000;
wrmsr(MSR_VR_MISC_CONFIG, msr);
/* Configure VR_MISC_CONFIG2 MSR. */
if (is_ult()) {
msr = rdmsr(MSR_VR_MISC_CONFIG2);
msr.lo &= ~0xffff;
/* Allow CPU to control minimum voltage completely (15:8) and
* set the fast ramp voltage to 1110mV (0x6f in 10mV steps). */
msr.lo |= 0x006f;
wrmsr(MSR_VR_MISC_CONFIG2, msr);
}
}
static void configure_pch_power_sharing(void)
{
u32 pch_power, pch_power_ext, pmsync, pmsync2;
@ -645,6 +696,8 @@ static void bsp_init_before_ap_bringup(struct bus *cpu_bus)
x86_setup_var_mtrrs(cpuid_eax(0x80000008) & 0xff, 2);
x86_mtrr_check();
initialize_vr_config();
if (is_ult()) {
calibrate_24mhz_bclk();
configure_pch_power_sharing();