#-
# Copyright (c) 2015 Landon Fuller <landon@landonf.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# $FreeBSD$

#include <sys/types.h>
#include <sys/bus.h>
#include <sys/rman.h>

#include <dev/bhnd/bhnd_types.h>

INTERFACE bhnd_bus;

#
# bhnd(4) bus interface
#

HEADER {
	/* forward declarations */
	struct bhnd_core_info;
	struct bhnd_chipid;
	struct bhnd_resource;
	struct bhnd_bus_ctx;
}

CODE {
	#include <sys/systm.h>

	#include <dev/bhnd/bhndvar.h>
	
	static struct bhnd_chipid *
	bhnd_bus_null_get_chipid(device_t dev, device_t child)
	{
		panic("bhnd_get_chipid unimplemented");
	}

	static int
	bhnd_bus_null_get_port_rid(device_t dev, device_t child,
	    bhnd_port_type port_type, u_int port, u_int region)
	{
		return (-1);
	}
	
	static int
	bhnd_bus_null_decode_port_rid(device_t dev, device_t child, int type,
	    int rid, bhnd_port_type *port_type, u_int *port, u_int *region)
	{
		return (ENOENT);
	}
	
	static int
	bhnd_bus_null_get_region_addr(device_t dev, device_t child, 
	    bhnd_port_type type, u_int port, u_int region, bhnd_addr_t *addr,
	    bhnd_size_t *size)
	{
		return (ENOENT);
	}
	
	static int
	bhnd_bus_null_read_nvram_var(device_t dev, device_t child,
	    const char *name, void *buf, size_t *size)
	{
		return (ENOENT);
	}
}

/**
 * Returns true if @p child is serving as a host bridge for the bhnd
 * bus.
 *
 * The default implementation will walk the parent device tree until
 * the root node is hit, returning false.
 *
 * @param dev The device whose child is being examined.
 * @param child The child device.
 */
METHOD bool is_hostb_device {
	device_t dev;
	device_t child;
} DEFAULT bhnd_generic_is_hostb_device;

/**
 * Return true if the hardware components required by @p child are unpopulated
 * or otherwise unusable.
 *
 * In some cases, enumerated devices may have pins that are left floating, or
 * the hardware may otherwise be non-functional; this method allows a parent
 * device to explicitly specify if a successfully enumerated @p child should
 * be disabled.
 *
 * @param dev The device whose child is being examined.
 * @param child The child device.
 */
METHOD bool is_hw_disabled {
	device_t dev;
	device_t child;
} DEFAULT bhnd_generic_is_hw_disabled;

/**
 * Return the probe (and attach) order for @p child. 
 *
 * All devices on the bhnd(4) bus will be probed, attached, or resumed in
 * ascending order; they will be suspended, shutdown, and detached in
 * descending order.
 *
 * The following device methods will be dispatched in ascending probe order
 * by the bus:
 *
 * - DEVICE_PROBE()
 * - DEVICE_ATTACH()
 * - DEVICE_RESUME()
 *
 * The following device methods will be dispatched in descending probe order
 * by the bus:
 *
 * - DEVICE_SHUTDOWN()
 * - DEVICE_DETACH()
 * - DEVICE_SUSPEND()
 *
 * @param dev The device whose child is being examined.
 * @param child The child device.
 *
 * Refer to BHND_PROBE_* and BHND_PROBE_ORDER_* for the standard set of
 * priorities.
 */
METHOD int get_probe_order {
	device_t dev;
	device_t child;
} DEFAULT bhnd_generic_get_probe_order;

/**
 * Return the BHND chip identification for the parent bus.
 *
 * @param dev The device whose child is being examined.
 * @param child The child device.
 */
METHOD const struct bhnd_chipid * get_chipid {
	device_t dev;
	device_t child;
} DEFAULT bhnd_bus_null_get_chipid;

/**
 * Reset the device's hardware core.
 *
 * @param dev The parent of @p child.
 * @param child The device to be reset.
 * @param flags Device-specific core flags to be supplied on reset.
 *
 * @retval 0 success
 * @retval non-zero error
 */
METHOD int reset_core {
	device_t dev;
	device_t child;
	uint16_t flags;
}

/**
 * Suspend a device hardware core.
 *
 * @param dev The parent of @p child.
 * @param child The device to be reset.
 *
 * @retval 0 success
 * @retval non-zero error
 */
METHOD int suspend_core {
	device_t dev;
	device_t child;
}

/**
 * Allocate a bhnd resource.
 *
 * This method's semantics are functionally identical to the bus API of the same
 * name; refer to BUS_ALLOC_RESOURCE for complete documentation.
 */
METHOD struct bhnd_resource * alloc_resource {
	device_t dev;
	device_t child;
	int type;
	int *rid;
	rman_res_t start;
	rman_res_t end;
	rman_res_t count;
	u_int flags;
} DEFAULT bhnd_generic_alloc_bhnd_resource;

/**
 * Release a bhnd resource.
 *
 * This method's semantics are functionally identical to the bus API of the same
 * name; refer to BUS_RELEASE_RESOURCE for complete documentation.
 */
METHOD int release_resource {
	device_t dev;
	device_t child;
	int type;
	int rid;
	struct bhnd_resource *res;
} DEFAULT bhnd_generic_release_bhnd_resource;

/**
 * Activate a bhnd resource.
 *
 * This method's semantics are functionally identical to the bus API of the same
 * name; refer to BUS_ACTIVATE_RESOURCE for complete documentation.
 */
METHOD int activate_resource {
	device_t dev;
        device_t child;
	int type;
        int rid;
        struct bhnd_resource *r;
} DEFAULT bhnd_generic_activate_bhnd_resource;

/**
 * Deactivate a bhnd resource.
 *
 * This method's semantics are functionally identical to the bus API of the same
 * name; refer to BUS_DEACTIVATE_RESOURCE for complete documentation.
 */
METHOD int deactivate_resource {
        device_t dev;
        device_t child;
        int type;
	int rid;
        struct bhnd_resource *r;
} DEFAULT bhnd_generic_deactivate_bhnd_resource;

/**
 * Return true if @p region_num is a valid region on @p port_num of
 * @p type attached to @p child.
 *
 * @param dev The device whose child is being examined.
 * @param child The child device.
 * @param type The port type being queried.
 * @param port_num The port number being queried.
 * @param region_num The region number being queried.
 */
METHOD u_int is_region_valid {
	device_t dev;
	device_t child;
	bhnd_port_type type;
	u_int port_num;
	u_int region_num;
} DEFAULT bhnd_generic_is_region_valid;

/**
 * Return the number of ports of type @p type attached to @p child.
 *
 * @param dev The device whose child is being examined.
 * @param child The child device.
 * @param type The port type being queried.
 */
METHOD u_int get_port_count {
	device_t dev;
	device_t child;
	bhnd_port_type type;
}

/**
 * Return the number of memory regions mapped to @p child @p port of
 * type @p type.
 *
 * @param dev The device whose child is being examined.
 * @param child The child device.
 * @param port The port number being queried.
 * @param type The port type being queried.
 */
METHOD u_int get_region_count {
	device_t dev;
	device_t child;
	bhnd_port_type type;
	u_int port;
}

/**
 * Return the SYS_RES_MEMORY resource-ID for a port/region pair attached to
 * @p child.
 *
 * @param dev The bus device.
 * @param child The bhnd child.
 * @param port_type The port type.
 * @param port_num The index of the child interconnect port.
 * @param region_num The index of the port-mapped address region.
 *
 * @retval -1 No such port/region found.
 */
METHOD int get_port_rid {
	device_t dev;
	device_t child;
	bhnd_port_type port_type;
	u_int port_num;
	u_int region_num;
} DEFAULT bhnd_bus_null_get_port_rid;


/**
 * Decode a port / region pair on @p child defined by @p type and @p rid.
 *
 * @param dev The bus device.
 * @param child The bhnd child.
 * @param type The resource type.
 * @param rid The resource ID.
 * @param[out] port_type The port's type.
 * @param[out] port The port identifier.
 * @param[out] region The identifier of the memory region on @p port.
 * 
 * @retval 0 success
 * @retval non-zero No matching type/rid found.
 */
METHOD int decode_port_rid {
	device_t dev;
	device_t child;
	int type;
	int rid;
	bhnd_port_type *port_type;
	u_int *port;
	u_int *region;
} DEFAULT bhnd_bus_null_decode_port_rid;

/**
 * Get the address and size of @p region on @p port.
 *
 * @param dev The bus device.
 * @param child The bhnd child.
 * @param port_type The port type.
 * @param port The port identifier.
 * @param region The identifier of the memory region on @p port.
 * @param[out] region_addr The region's base address.
 * @param[out] region_size The region's size.
 *
 * @retval 0 success
 * @retval non-zero No matching port/region found.
 */
METHOD int get_region_addr {
	device_t dev;
	device_t child;
	bhnd_port_type port_type;
	u_int port;
	u_int region;
	bhnd_addr_t *region_addr;
	bhnd_size_t *region_size;
} DEFAULT bhnd_bus_null_get_region_addr;

/**
 * Read an NVRAM variable.
 * 
 * It is the responsibility of the bus to delegate this request to
 * the appropriate NVRAM child device, or to a parent bus implementation.
 *
 * @param		dev	The bus device.
 * @param		child	The requesting device.
 * @param		name	The NVRAM variable name.
 * @param[out]		buf	On success, the requested value will be written
 *				to this buffer. This argment may be NULL if
 *				the value is not desired.
 * @param[in,out]	size	The capacity of @p buf. On success, will be set
 *				to the actual size of the requested value.
 *
 * @retval 0		success
 * @retval ENOENT	The requested variable was not found.
 * @retval ENOMEM	If @p buf is non-NULL and a buffer of @p size is too
 *			small to hold the requested value.
 * @retval non-zero	If reading @p name otherwise fails, a regular unix
 *			error code will be returned.
 */
METHOD int read_nvram_var {
	device_t	 dev;
	device_t	 child;
	const char	*name;
	void		*buf;
	size_t		*size;
} DEFAULT bhnd_bus_null_read_nvram_var;


/** An implementation of bus_read_1() compatible with bhnd_resource */
METHOD uint8_t read_1 {
	device_t dev;
	device_t child;
	struct bhnd_resource *r;
	bus_size_t offset;
}

/** An implementation of bus_read_2() compatible with bhnd_resource */
METHOD uint16_t read_2 {
	device_t dev;
	device_t child;
	struct bhnd_resource *r;
	bus_size_t offset;
}

/** An implementation of bus_read_4() compatible with bhnd_resource */
METHOD uint32_t read_4 {
	device_t dev;
	device_t child;
	struct bhnd_resource *r;
	bus_size_t offset;
}

/** An implementation of bus_write_1() compatible with bhnd_resource */
METHOD void write_1 {
	device_t dev;
	device_t child;
	struct bhnd_resource *r;
	bus_size_t offset;
	uint8_t value;
}

/** An implementation of bus_write_2() compatible with bhnd_resource */
METHOD void write_2 {
	device_t dev;
	device_t child;
	struct bhnd_resource *r;
	bus_size_t offset;
	uint16_t value;
}

/** An implementation of bus_write_4() compatible with bhnd_resource */
METHOD void write_4 {
	device_t dev;
	device_t child;
	struct bhnd_resource *r;
	bus_size_t offset;
	uint32_t value;
}

/** An implementation of bus_barrier() compatible with bhnd_resource */
METHOD void barrier {
	device_t dev;
	device_t child;
	struct bhnd_resource *r;
	bus_size_t offset;
	bus_size_t length;
	int flags;
}