1 files changed, 111 insertions, 0 deletions
diff --git a/lib/utils/fdt/fdt_pmu.c b/lib/utils/fdt/fdt_pmu.c
new file mode 100644
index 0000000..9ebf1c2
--- /dev/null
+++ b/lib/utils/fdt/fdt_pmu.c
@@ -0,0 +1,111 @@
+// 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_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;
+
+	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");
+
+	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;
+}