// SPDX-License-Identifier: GPL-2.0-only OR MIT /* * Apple mailbox driver * * Copyright The Asahi Linux Contributors * * This driver adds support for two mailbox variants (called ASC and M3 by * Apple) found in Apple SoCs such as the M1. It consists of two FIFOs used to * exchange 64+32 bit messages between the main CPU and a co-processor. * Various coprocessors implement different IPC protocols based on these simple * messages and shared memory buffers. * * Both the main CPU and the co-processor see the same set of registers but * the first FIFO (A2I) is always used to transfer messages from the application * processor (us) to the I/O processor and the second one (I2A) for the * other direction. */ #include <linux/bitfield.h> #include <linux/bits.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/spinlock.h> #include <linux/types.h> #include "mailbox.h" #define APPLE_ASC_MBOX_CONTROL_FULL … #define APPLE_ASC_MBOX_CONTROL_EMPTY … #define APPLE_ASC_MBOX_A2I_CONTROL … #define APPLE_ASC_MBOX_A2I_SEND0 … #define APPLE_ASC_MBOX_A2I_SEND1 … #define APPLE_ASC_MBOX_A2I_RECV0 … #define APPLE_ASC_MBOX_A2I_RECV1 … #define APPLE_ASC_MBOX_I2A_CONTROL … #define APPLE_ASC_MBOX_I2A_SEND0 … #define APPLE_ASC_MBOX_I2A_SEND1 … #define APPLE_ASC_MBOX_I2A_RECV0 … #define APPLE_ASC_MBOX_I2A_RECV1 … #define APPLE_M3_MBOX_CONTROL_FULL … #define APPLE_M3_MBOX_CONTROL_EMPTY … #define APPLE_M3_MBOX_A2I_CONTROL … #define APPLE_M3_MBOX_A2I_SEND0 … #define APPLE_M3_MBOX_A2I_SEND1 … #define APPLE_M3_MBOX_A2I_RECV0 … #define APPLE_M3_MBOX_A2I_RECV1 … #define APPLE_M3_MBOX_I2A_CONTROL … #define APPLE_M3_MBOX_I2A_SEND0 … #define APPLE_M3_MBOX_I2A_SEND1 … #define APPLE_M3_MBOX_I2A_RECV0 … #define APPLE_M3_MBOX_I2A_RECV1 … #define APPLE_M3_MBOX_IRQ_ENABLE … #define APPLE_M3_MBOX_IRQ_ACK … #define APPLE_M3_MBOX_IRQ_A2I_EMPTY … #define APPLE_M3_MBOX_IRQ_A2I_NOT_EMPTY … #define APPLE_M3_MBOX_IRQ_I2A_EMPTY … #define APPLE_M3_MBOX_IRQ_I2A_NOT_EMPTY … #define APPLE_MBOX_MSG1_OUTCNT … #define APPLE_MBOX_MSG1_INCNT … #define APPLE_MBOX_MSG1_OUTPTR … #define APPLE_MBOX_MSG1_INPTR … #define APPLE_MBOX_MSG1_MSG … #define APPLE_MBOX_TX_TIMEOUT … struct apple_mbox_hw { … }; int apple_mbox_send(struct apple_mbox *mbox, const struct apple_mbox_msg msg, bool atomic) { … } EXPORT_SYMBOL(…); static irqreturn_t apple_mbox_send_empty_irq(int irq, void *data) { … } static int apple_mbox_poll_locked(struct apple_mbox *mbox) { … } static irqreturn_t apple_mbox_recv_irq(int irq, void *data) { … } int apple_mbox_poll(struct apple_mbox *mbox) { … } EXPORT_SYMBOL(…); int apple_mbox_start(struct apple_mbox *mbox) { … } EXPORT_SYMBOL(…); void apple_mbox_stop(struct apple_mbox *mbox) { … } EXPORT_SYMBOL(…); struct apple_mbox *apple_mbox_get(struct device *dev, int index) { … } EXPORT_SYMBOL(…); struct apple_mbox *apple_mbox_get_byname(struct device *dev, const char *name) { … } EXPORT_SYMBOL(…); static int apple_mbox_probe(struct platform_device *pdev) { … } static const struct apple_mbox_hw apple_mbox_asc_hw = …; static const struct apple_mbox_hw apple_mbox_m3_hw = …; static const struct of_device_id apple_mbox_of_match[] = …; MODULE_DEVICE_TABLE(of, apple_mbox_of_match); static struct platform_driver apple_mbox_driver = …; module_platform_driver(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …;
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