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soc/intel: convert XTAL frequency constant to Kconfig

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This converts the constant for the XTAL frequency to a Kconfig option.

Change-Id: I1382dd274eeb9cb748f94c34f5d9a83880624c18
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46018
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Michael Niewöhner
2020-10-04 14:48:05 +02:00
committed by Patrick Georgi
parent fe6070f728
commit dadcbfbe8c
25 changed files with 85 additions and 63 deletions
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12
src/soc/intel/apollolake/pmutil.c
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@ -180,15 +180,17 @@ int soc_prev_sleep_state(const struct chipset_power_state *ps,
void enable_pm_timer_emulation(void)
{
/* ACPI PM timer emulation */
msr_t msr;
if (!CONFIG_CPU_XTAL_HZ)
return;
/*
* The derived frequency is calculated as follows:
* (CTC_FREQ * msr[63:32]) >> 32 = target frequency.
* Back solve the multiplier so the 3.579545MHz ACPI timer
* frequency is used.
* (clock * msr[63:32]) >> 32 = target frequency.
* Back solve the multiplier so the 3.579545MHz ACPI timer frequency is used.
*/
msr.hi = (3579545ULL << 32) / CTC_FREQ;
msr.hi = (3579545ULL << 32) / CONFIG_CPU_XTAL_HZ;
/* Set PM1 timer IO port and enable */
msr.lo = EMULATE_PM_TMR_EN | (ACPI_BASE_ADDRESS + R_ACPI_PM1_TMR);
wrmsr(MSR_EMULATE_PM_TIMER, msr);