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// SPDX-License-Identifier: MIT
/*
* Copyright © 2022 Intel Corporation
*/
#include "xe_gt_clock.h"
#include "regs/xe_gt_regs.h"
#include "xe_device.h"
#include "xe_gt.h"
#include "xe_macros.h"
#include "xe_mmio.h"
#include "i915_reg.h"
static u32 read_reference_ts_freq(struct xe_gt *gt)
{
u32 ts_override = xe_mmio_read32(gt, GEN9_TIMESTAMP_OVERRIDE.reg);
u32 base_freq, frac_freq;
base_freq = ((ts_override & GEN9_TIMESTAMP_OVERRIDE_US_COUNTER_DIVIDER_MASK) >>
GEN9_TIMESTAMP_OVERRIDE_US_COUNTER_DIVIDER_SHIFT) + 1;
base_freq *= 1000000;
frac_freq = ((ts_override &
GEN9_TIMESTAMP_OVERRIDE_US_COUNTER_DENOMINATOR_MASK) >>
GEN9_TIMESTAMP_OVERRIDE_US_COUNTER_DENOMINATOR_SHIFT);
frac_freq = 1000000 / (frac_freq + 1);
return base_freq + frac_freq;
}
static u32 get_crystal_clock_freq(u32 rpm_config_reg)
{
const u32 f19_2_mhz = 19200000;
const u32 f24_mhz = 24000000;
const u32 f25_mhz = 25000000;
const u32 f38_4_mhz = 38400000;
u32 crystal_clock =
(rpm_config_reg & GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_MASK) >>
GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_SHIFT;
switch (crystal_clock) {
case GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_24_MHZ:
return f24_mhz;
case GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_19_2_MHZ:
return f19_2_mhz;
case GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_38_4_MHZ:
return f38_4_mhz;
case GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_25_MHZ:
return f25_mhz;
default:
XE_BUG_ON("NOT_POSSIBLE");
return 0;
}
}
int xe_gt_clock_init(struct xe_gt *gt)
{
u32 ctc_reg = xe_mmio_read32(gt, CTC_MODE.reg);
u32 freq = 0;
/* Assuming gen11+ so assert this assumption is correct */
XE_BUG_ON(GRAPHICS_VER(gt_to_xe(gt)) < 11);
if ((ctc_reg & CTC_SOURCE_PARAMETER_MASK) == CTC_SOURCE_DIVIDE_LOGIC) {
freq = read_reference_ts_freq(gt);
} else {
u32 c0 = xe_mmio_read32(gt, RPM_CONFIG0.reg);
freq = get_crystal_clock_freq(c0);
/*
* Now figure out how the command stream's timestamp
* register increments from this frequency (it might
* increment only every few clock cycle).
*/
freq >>= 3 - ((c0 & GEN10_RPM_CONFIG0_CTC_SHIFT_PARAMETER_MASK) >>
GEN10_RPM_CONFIG0_CTC_SHIFT_PARAMETER_SHIFT);
}
gt->info.clock_freq = freq;
return 0;
}
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