| 1 | /* SPDX-License-Identifier: GPL-2.0-only OR MIT */ |
|---|---|
| 2 | /* |
| 3 | * Apple mailbox message format |
| 4 | * |
| 5 | * Copyright The Asahi Linux Contributors |
| 6 | */ |
| 7 | |
| 8 | #ifndef _APPLE_MAILBOX_H_ |
| 9 | #define _APPLE_MAILBOX_H_ |
| 10 | |
| 11 | #include <linux/device.h> |
| 12 | #include <linux/types.h> |
| 13 | |
| 14 | /* encodes a single 96bit message sent over the single channel */ |
| 15 | struct apple_mbox_msg { |
| 16 | u64 msg0; |
| 17 | u32 msg1; |
| 18 | }; |
| 19 | |
| 20 | struct apple_mbox { |
| 21 | struct device *dev; |
| 22 | void __iomem *regs; |
| 23 | const struct apple_mbox_hw *hw; |
| 24 | bool active; |
| 25 | |
| 26 | int irq_recv_not_empty; |
| 27 | int irq_send_empty; |
| 28 | |
| 29 | spinlock_t rx_lock; |
| 30 | spinlock_t tx_lock; |
| 31 | |
| 32 | struct completion tx_empty; |
| 33 | |
| 34 | /** Receive callback for incoming messages */ |
| 35 | void (*rx)(struct apple_mbox *mbox, struct apple_mbox_msg msg, void *cookie); |
| 36 | void *cookie; |
| 37 | }; |
| 38 | |
| 39 | struct apple_mbox *apple_mbox_get(struct device *dev, int index); |
| 40 | struct apple_mbox *apple_mbox_get_byname(struct device *dev, const char *name); |
| 41 | |
| 42 | int apple_mbox_start(struct apple_mbox *mbox); |
| 43 | void apple_mbox_stop(struct apple_mbox *mbox); |
| 44 | int apple_mbox_poll(struct apple_mbox *mbox); |
| 45 | int apple_mbox_send(struct apple_mbox *mbox, struct apple_mbox_msg msg, |
| 46 | bool atomic); |
| 47 | |
| 48 | #endif |
| 49 |