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authorAaron Durbin <adurbin@chromium.org>2013-10-07 17:12:20 -0500
committerAaron Durbin <adurbin@google.com>2014-02-11 22:19:14 +0100
commitbb3ee8371160e7ffc4d2f4e6de870b7fa3e01d70 (patch)
treec459f7c2e6f4f610e20ef7ffa4d164486f527811 /src
parent08a4613219f5a26a2bcf1216deeb08284cb5269a (diff)
downloadcoreboot-bb3ee8371160e7ffc4d2f4e6de870b7fa3e01d70.tar.xz
baytrail: set max frequency early in romstage
Set the BSP to operate at max frequency early in romstage. The call to punit_init() is when the frequency actually ramps as that makes the punit actually start working. BUG=chrome-os-partner:22857 BRANCH=None TEST=Built and booted. Noted operating frequency status is max. Change-Id: Icfd9e5c7682aa21fc740bd687607ca6a66597d5e Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/172131 Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: http://review.coreboot.org/4869 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Diffstat (limited to 'src')
-rw-r--r--src/soc/intel/baytrail/baytrail/ramstage.h1
-rw-r--r--src/soc/intel/baytrail/baytrail/romstage.h1
-rw-r--r--src/soc/intel/baytrail/romstage/romstage.c2
-rw-r--r--src/soc/intel/baytrail/tsc_freq.c29
4 files changed, 33 insertions, 0 deletions
diff --git a/src/soc/intel/baytrail/baytrail/ramstage.h b/src/soc/intel/baytrail/baytrail/ramstage.h
index d1fe0f1d15..ff0397c641 100644
--- a/src/soc/intel/baytrail/baytrail/ramstage.h
+++ b/src/soc/intel/baytrail/baytrail/ramstage.h
@@ -25,6 +25,7 @@
/* The baytrail_init_pre_device() function is called prior to device
* initialization, but it's after console and cbmem has been reinitialized. */
void baytrail_init_pre_device(void);
+void set_max_freq(void);
extern struct pci_operations soc_pci_ops;
diff --git a/src/soc/intel/baytrail/baytrail/romstage.h b/src/soc/intel/baytrail/baytrail/romstage.h
index 4918a02cf4..43c60eccc7 100644
--- a/src/soc/intel/baytrail/baytrail/romstage.h
+++ b/src/soc/intel/baytrail/baytrail/romstage.h
@@ -49,6 +49,7 @@ void raminit(struct mrc_params *mp, int prev_sleep_state);
void gfx_init(void);
void tco_disable(void);
void punit_init(void);
+void set_max_freq(void);
#if CONFIG_ENABLE_BUILTIN_COM1
void byt_config_com1_and_enable(void);
diff --git a/src/soc/intel/baytrail/romstage/romstage.c b/src/soc/intel/baytrail/romstage/romstage.c
index 6e965bc3cd..00350190ba 100644
--- a/src/soc/intel/baytrail/romstage/romstage.c
+++ b/src/soc/intel/baytrail/romstage/romstage.c
@@ -126,6 +126,8 @@ void romstage_common(struct romstage_params *params)
console_init();
+ set_max_freq();
+
punit_init();
gfx_init();
diff --git a/src/soc/intel/baytrail/tsc_freq.c b/src/soc/intel/baytrail/tsc_freq.c
index e0b2b7e908..0cf7273b74 100644
--- a/src/soc/intel/baytrail/tsc_freq.c
+++ b/src/soc/intel/baytrail/tsc_freq.c
@@ -21,6 +21,12 @@
#include <cpu/x86/msr.h>
#include <cpu/x86/tsc.h>
#include <baytrail/msr.h>
+#if !defined(__PRE_RAM__)
+#include <baytrail/ramstage.h>
+#else
+#include <baytrail/romstage.h>
+#endif
+
#define BCLK 100 /* 100 MHz */
unsigned long tsc_freq_mhz(void)
@@ -30,3 +36,26 @@ unsigned long tsc_freq_mhz(void)
platform_info = rdmsr(MSR_PLATFORM_INFO);
return BCLK * ((platform_info.lo >> 8) & 0xff);
}
+
+void set_max_freq(void)
+{
+ msr_t perf_ctl;
+ msr_t msr;
+
+ /* Enable speed step. */
+ msr = rdmsr(MSR_IA32_MISC_ENABLES);
+ msr.lo |= (1 << 16);
+ wrmsr(MSR_IA32_MISC_ENABLES, msr);
+
+ /* Set guranteed ratio [21:16] from IACORE_RATIOS to bits [15:8] of
+ * the PERF_CTL. */
+ msr = rdmsr(MSR_IACORE_RATIOS);
+ perf_ctl.lo = (msr.lo & 0x3f0000) >> 8;
+ /* Set guranteed vid [21:16] from IACORE_VIDS to bits [7:0] of
+ * the PERF_CTL. */
+ msr = rdmsr(MSR_IACORE_VIDS);
+ perf_ctl.lo |= (msr.lo & 0x7f0000) >> 16;
+ perf_ctl.hi = 0;
+
+ wrmsr(MSR_IA32_PERF_CTL, perf_ctl);
+}