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Diffstat (limited to 'drivers/soc/apple/mailbox.h')
-rw-r--r--drivers/soc/apple/mailbox.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/soc/apple/mailbox.h b/drivers/soc/apple/mailbox.h
new file mode 100644
index 0000000000..f73a8913da
--- /dev/null
+++ b/drivers/soc/apple/mailbox.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
+/*
+ * Apple mailbox message format
+ *
+ * Copyright The Asahi Linux Contributors
+ */
+
+#ifndef _APPLE_MAILBOX_H_
+#define _APPLE_MAILBOX_H_
+
+#include <linux/device.h>
+#include <linux/types.h>
+
+/* encodes a single 96bit message sent over the single channel */
+struct apple_mbox_msg {
+ u64 msg0;
+ u32 msg1;
+};
+
+struct apple_mbox {
+ struct device *dev;
+ void __iomem *regs;
+ const struct apple_mbox_hw *hw;
+ bool active;
+
+ int irq_recv_not_empty;
+ int irq_send_empty;
+
+ spinlock_t rx_lock;
+ spinlock_t tx_lock;
+
+ struct completion tx_empty;
+
+ /** Receive callback for incoming messages */
+ void (*rx)(struct apple_mbox *mbox, struct apple_mbox_msg msg, void *cookie);
+ void *cookie;
+};
+
+struct apple_mbox *apple_mbox_get(struct device *dev, int index);
+struct apple_mbox *apple_mbox_get_byname(struct device *dev, const char *name);
+
+int apple_mbox_start(struct apple_mbox *mbox);
+void apple_mbox_stop(struct apple_mbox *mbox);
+int apple_mbox_poll(struct apple_mbox *mbox);
+int apple_mbox_send(struct apple_mbox *mbox, struct apple_mbox_msg msg,
+ bool atomic);
+
+#endif