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-rw-r--r--include/acpi/pcc.h35
1 files changed, 35 insertions, 0 deletions
diff --git a/include/acpi/pcc.h b/include/acpi/pcc.h
new file mode 100644
index 0000000000..73e806fe7c
--- /dev/null
+++ b/include/acpi/pcc.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * PCC (Platform Communications Channel) methods
+ */
+
+#ifndef _PCC_H
+#define _PCC_H
+
+#include <linux/mailbox_controller.h>
+#include <linux/mailbox_client.h>
+
+struct pcc_mbox_chan {
+ struct mbox_chan *mchan;
+ u64 shmem_base_addr;
+ u64 shmem_size;
+ u32 latency;
+ u32 max_access_rate;
+ u16 min_turnaround_time;
+};
+
+#define MAX_PCC_SUBSPACES 256
+#ifdef CONFIG_PCC
+extern struct pcc_mbox_chan *
+pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);
+extern void pcc_mbox_free_channel(struct pcc_mbox_chan *chan);
+#else
+static inline struct pcc_mbox_chan *
+pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
+{
+ return ERR_PTR(-ENODEV);
+}
+static inline void pcc_mbox_free_channel(struct pcc_mbox_chan *chan) { }
+#endif
+
+#endif /* _PCC_H */