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// SPDX-License-Identifier: BSD-2-Clause
/*
* fdt_pmu.c - Flat Device Tree PMU helper routines
*
* Copyright (c) 2021 Western Digital Corporation or its affiliates.
*
* Authors:
* Atish Patra <atish.patra@wdc.com>
*/
#include <libfdt.h>
#include <sbi/sbi_hart.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_pmu.h>
#include <sbi_utils/fdt/fdt_helper.h>
#define FDT_PMU_HW_EVENT_MAX (SBI_PMU_HW_EVENT_MAX * 2)
struct fdt_pmu_hw_event_select {
uint32_t eidx;
uint64_t select;
};
static struct fdt_pmu_hw_event_select fdt_pmu_evt_select[FDT_PMU_HW_EVENT_MAX] = {0};
static uint32_t hw_event_count;
uint64_t fdt_pmu_get_select_value(uint32_t event_idx)
{
int i;
struct fdt_pmu_hw_event_select *event;
for (i = 0; i < SBI_PMU_HW_EVENT_MAX; i++) {
event = &fdt_pmu_evt_select[i];
if (event->eidx == event_idx)
return event->select;
}
return 0;
}
int fdt_pmu_fixup(void *fdt)
{
int pmu_offset;
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
if (!fdt)
return SBI_EINVAL;
pmu_offset = fdt_node_offset_by_compatible(fdt, -1, "riscv,pmu");
if (pmu_offset < 0)
return SBI_EFAIL;
fdt_delprop(fdt, pmu_offset, "pmu,event-to-mhpmcounters");
fdt_delprop(fdt, pmu_offset, "pmu,event-to-mhpmevent");
fdt_delprop(fdt, pmu_offset, "pmu,raw-event-to-mhpmcounters");
if (!sbi_hart_has_feature(scratch, SBI_HART_HAS_SSCOFPMF))
fdt_delprop(fdt, pmu_offset, "interrupts-extended");
return 0;
}
int fdt_pmu_setup(void *fdt)
{
int i, pmu_offset, len, result;
const u32 *event_val;
const u32 *event_ctr_map;
struct fdt_pmu_hw_event_select *event;
uint64_t raw_selector;
u32 event_idx_start, event_idx_end, ctr_map;
if (!fdt)
return SBI_EINVAL;
pmu_offset = fdt_node_offset_by_compatible(fdt, -1, "riscv,pmu");
if (pmu_offset < 0)
return SBI_EFAIL;
event_ctr_map = fdt_getprop(fdt, pmu_offset, "pmu,event-to-mhpmcounters", &len);
if (!event_ctr_map || len < 8)
return SBI_EFAIL;
len = len / (sizeof(u32) * 3);
for (i = 0; i < len; i++) {
event_idx_start = fdt32_to_cpu(event_ctr_map[3 * i]);
event_idx_end = fdt32_to_cpu(event_ctr_map[3 * i + 1]);
ctr_map = fdt32_to_cpu(event_ctr_map[3 * i + 2]);
sbi_pmu_add_hw_event_counter_map(event_idx_start, event_idx_end, ctr_map);
}
event_val = fdt_getprop(fdt, pmu_offset, "pmu,event-to-mhpmevent", &len);
if (!event_val || len < 8)
return SBI_EFAIL;
len = len / (sizeof(u32) * 3);
for (i = 0; i < len; i++) {
event = &fdt_pmu_evt_select[hw_event_count];
event->eidx = fdt32_to_cpu(event_val[3 * i]);
event->select = fdt32_to_cpu(event_val[3 * i + 1]);
event->select = (event->select << 32) | fdt32_to_cpu(event_val[3 * i + 2]);
hw_event_count++;
}
event_val = fdt_getprop(fdt, pmu_offset, "pmu,raw-event-to-mhpmcounters", &len);
if (!event_val || len < 8)
return SBI_EFAIL;
len = len / (sizeof(u32) * 3);
for (i = 0; i < len; i++) {
raw_selector = fdt32_to_cpu(event_val[3 * i]);
raw_selector = (raw_selector << 32) | fdt32_to_cpu(event_val[3 * i + 1]);
ctr_map = fdt32_to_cpu(event_val[3 * i + 2]);
result = sbi_pmu_add_raw_event_counter_map(raw_selector, ctr_map);
if (!result)
hw_event_count++;
}
return 0;
}
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