path: root/include/linux/mic_bus.h

/*
 * Intel MIC Platform Software Stack (MPSS)
 *
 * Copyright(c) 2014 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Intel MIC Bus driver.
 *
 * This implementation is very similar to the the virtio bus driver
 * implementation @ include/linux/virtio.h.
 */
#ifndef _MIC_BUS_H_
#define _MIC_BUS_H_
/*
 * Everything a mbus driver needs to work with any particular mbus
 * implementation.
 */
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>

struct mbus_device_id {
	__u32 device;
	__u32 vendor;
};

#define MBUS_DEV_DMA_HOST 2
#define MBUS_DEV_DMA_MIC 3
#define MBUS_DEV_ANY_ID 0xffffffff

/**
 * mbus_device - representation of a device using mbus
 * @mmio_va: virtual address of mmio space
 * @hw_ops: the hardware ops supported by this device.
 * @id: the device type identification (used to match it with a driver).
 * @dev: underlying device.
 * be used to communicate with.
 * @index: unique position on the mbus bus
 */
struct mbus_device {
	void __iomem *mmio_va;
	struct mbus_hw_ops *hw_ops;
	struct mbus_device_id id;
	struct device dev;
	int index;
};

/**
 * mbus_driver - operations for a mbus I/O driver
 * @driver: underlying device driver (populate name and owner).
 * @id_table: the ids serviced by this driver.
 * @probe: the function to call when a device is found.  Returns 0 or -errno.
 * @remove: the function to call when a device is removed.
 */
struct mbus_driver {
	struct device_driver driver;
	const struct mbus_device_id *id_table;
	int (*probe)(struct mbus_device *dev);
	void (*scan)(struct mbus_device *dev);
	void (*remove)(struct mbus_device *dev);
};

/**
 * struct mic_irq - opaque pointer used as cookie
 */
struct mic_irq;

/**
 * mbus_hw_ops - Hardware operations for accessing a MIC device on the MIC bus.
 */
struct mbus_hw_ops {
	struct mic_irq* (*request_threaded_irq)(struct mbus_device *mbdev,
						irq_handler_t handler,
						irq_handler_t thread_fn,
						const char *name, void *data,
						int intr_src);
	void (*free_irq)(struct mbus_device *mbdev,
			 struct mic_irq *cookie, void *data);
	void (*ack_interrupt)(struct mbus_device *mbdev, int num);
};

struct mbus_device *
mbus_register_device(struct device *pdev, int id, struct dma_map_ops *dma_ops,
		     struct mbus_hw_ops *hw_ops, void __iomem *mmio_va);
void mbus_unregister_device(struct mbus_device *mbdev);

int mbus_register_driver(struct mbus_driver *drv);
void mbus_unregister_driver(struct mbus_driver *drv);

static inline struct mbus_device *dev_to_mbus(struct device *_dev)
{
	return container_of(_dev, struct mbus_device, dev);
}

static inline struct mbus_driver *drv_to_mbus(struct device_driver *drv)
{
	return container_of(drv, struct mbus_driver, driver);
}

#endif /* _MIC_BUS_H */