1 files changed, 75 insertions, 0 deletions
diff --git a/lib/cpus/aarch64/cortex_a75_pubsub.c b/lib/cpus/aarch64/cortex_a75_pubsub.c
new file mode 100644
index 00000000..c1089a60
--- /dev/null
+++ b/lib/cpus/aarch64/cortex_a75_pubsub.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <cortex_a75.h>
+#include <pubsub_events.h>
+#include <platform.h>
+
+struct amu_ctx {
+	uint64_t cnts[CORTEX_A75_AMU_NR_COUNTERS];
+	uint16_t mask;
+};
+
+static struct amu_ctx amu_ctxs[PLATFORM_CORE_COUNT];
+
+static void *cortex_a75_context_save(const void *arg)
+{
+	struct amu_ctx *ctx = &amu_ctxs[plat_my_core_pos()];
+	unsigned int midr;
+	unsigned int midr_mask;
+	int i;
+
+	midr = read_midr();
+	midr_mask = (MIDR_IMPL_MASK << MIDR_IMPL_SHIFT) |
+		(MIDR_PN_MASK << MIDR_PN_SHIFT);
+	if ((midr & midr_mask) != (CORTEX_A75_MIDR & midr_mask))
+		return 0;
+
+	/* Save counter configuration */
+	ctx->mask = cortex_a75_amu_read_cpuamcntenset_el0();
+
+	/* Ensure counters are disabled */
+	cortex_a75_amu_write_cpuamcntenclr_el0(ctx->mask);
+	isb();
+
+	/* Save counters */
+	for (i = 0; i < CORTEX_A75_AMU_NR_COUNTERS; i++)
+		ctx->cnts[i] = cortex_a75_amu_cnt_read(i);
+
+	return 0;
+}
+
+static void *cortex_a75_context_restore(const void *arg)
+{
+	struct amu_ctx *ctx = &amu_ctxs[plat_my_core_pos()];
+	unsigned int midr;
+	unsigned int midr_mask;
+	int i;
+
+	midr = read_midr();
+	midr_mask = (MIDR_IMPL_MASK << MIDR_IMPL_SHIFT) |
+		(MIDR_PN_MASK << MIDR_PN_SHIFT);
+	if ((midr & midr_mask) != (CORTEX_A75_MIDR & midr_mask))
+		return 0;
+
+	ctx = &amu_ctxs[plat_my_core_pos()];
+
+	/* Counters were disabled in `cortex_a75_context_save()` */
+	assert(cortex_a75_amu_read_cpuamcntenset_el0() == 0);
+
+	/* Restore counters */
+	for (i = 0; i < CORTEX_A75_AMU_NR_COUNTERS; i++)
+		cortex_a75_amu_cnt_write(i, ctx->cnts[i]);
+	isb();
+
+	/* Restore counter configuration */
+	cortex_a75_amu_write_cpuamcntenset_el0(ctx->mask);
+
+	return 0;
+}
+
+SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_start, cortex_a75_context_save);
+SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_finish, cortex_a75_context_restore);