/*-
 * Copyright (c) 1997,1998,2003 Doug Rabson
 * 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 AND CONTRIBUTORS ``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: src/sys/sys/bus.h,v 1.62.2.3 2005/04/14 18:11:13 njl Exp $
 */

#ifndef _SYS_BUS_H_
#define _SYS_BUS_H_

/**
 * @defgroup NEWBUS newbus - a generic framework for managing devices
 * @{
 */

/**
 * @brief Interface information structure.
 */
struct u_businfo {
	int	ub_version;		/**< @brief interface version */
#define BUS_USER_VERSION	1
	int	ub_generation;		/**< @brief generation count */
};

/**
 * @brief State of the device.
 */
typedef enum device_state {
	DS_NOTPRESENT,			/**< @brief not probed or probe failed */
	DS_ALIVE,			/**< @brief probe succeeded */
	DS_ATTACHED,			/**< @brief attach method called */
	DS_BUSY				/**< @brief device is open */
} device_state_t;

/**
 * @brief Device information exported to userspace.
 */
struct u_device {
	uintptr_t	dv_handle;
	uintptr_t	dv_parent;

	char		dv_name[32];		/**< @brief Name of device in tree. */
	char		dv_desc[32];		/**< @brief Driver description */
	char		dv_drivername[32];	/**< @brief Driver name */
	char		dv_pnpinfo[128];	/**< @brief Plug and play info */
	char		dv_location[128];	/**< @brief Where is the device? */
	uint32_t	dv_devflags;		/**< @brief API Flags for device */
	uint16_t	dv_flags;		/**< @brief flags for dev date */
	device_state_t	dv_state;		/**< @brief State of attachment */
	/* XXX more driver info? */
};

#ifdef _KERNEL

#include <sys/queue.h>
#include <sys/kobj.h>

/**
 * devctl hooks.  Typically one should use the devctl_notify
 * hook to send the message.  However, devctl_queue_data is also
 * included in case devctl_notify isn't sufficiently general.
 */
void devctl_notify(const char *__system, const char *__subsystem,
    const char *__type, const char *__data);
void devctl_queue_data(char *__data);

/*
 * Forward declarations
 */
typedef struct device		*device_t;

/**
 * @brief A device driver (included mainly for compatibility with
 * FreeBSD 4.x).
 */
typedef struct kobj_class	driver_t;

/**
 * @brief A device class
 *
 * The devclass object has two main functions in the system. The first
 * is to manage the allocation of unit numbers for device instances
 * and the second is to hold the list of device drivers for a
 * particular bus type. Each devclass has a name and there cannot be
 * two devclasses with the same name. This ensures that unique unit
 * numbers are allocated to device instances.
 *
 * Drivers that support several different bus attachments (e.g. isa,
 * pci, pccard) should all use the same devclass to ensure that unit
 * numbers do not conflict.
 *
 * Each devclass may also have a parent devclass. This is used when
 * searching for device drivers to allow a form of inheritance. When
 * matching drivers with devices, first the driver list of the parent
 * device's devclass is searched. If no driver is found in that list,
 * the search continues in the parent devclass (if any).
 */
typedef struct devclass		*devclass_t;

/**
 * @brief A device method (included mainly for compatibility with
 * FreeBSD 4.x).
 */
#define device_method_t		kobj_method_t

/**
 * @brief A driver interrupt service routine
 */
typedef void driver_intr_t(void*);

/**
 * @brief Interrupt type bits.
 * 
 * These flags are used both by newbus interrupt
 * registration (nexus.c) and also in struct intrec, which defines
 * interrupt properties.
 *
 * XXX We should probably revisit this and remove the vestiges of the
 * spls implicit in names like INTR_TYPE_TTY. In the meantime, don't
 * confuse things by renaming them (Grog, 18 July 2000).
 *
 * We define this in terms of bits because some devices may belong
 * to multiple classes (and therefore need to be included in
 * multiple interrupt masks, which is what this really serves to
 * indicate. Buses which do interrupt remapping will want to
 * change their type to reflect what sort of devices are underneath.
 */
enum intr_type {
	INTR_TYPE_TTY = 1,
	INTR_TYPE_BIO = 2,
	INTR_TYPE_NET = 4,
	INTR_TYPE_CAM = 8,
	INTR_TYPE_MISC = 16,
	INTR_TYPE_CLK = 32,
	INTR_TYPE_AV = 64,
	INTR_FAST = 128,
	INTR_EXCL = 256,		/* exclusive interrupt */
	INTR_MPSAFE = 512,		/* this interrupt is SMP safe */
	INTR_ENTROPY = 1024		/* this interrupt provides entropy */
};

enum intr_trigger {
	INTR_TRIGGER_CONFORM = 0,
	INTR_TRIGGER_EDGE = 1,
	INTR_TRIGGER_LEVEL = 2
};

enum intr_polarity {
	INTR_POLARITY_CONFORM = 0,
	INTR_POLARITY_HIGH = 1,
	INTR_POLARITY_LOW = 2
};

typedef int (*devop_t)(void);

/**
 * @brief This structure is deprecated.
 *
 * Use the kobj(9) macro DEFINE_CLASS to
 * declare classes which implement device drivers.
 */
struct driver {
	KOBJ_CLASS_FIELDS;
};

/*
 * Definitions for drivers which need to keep simple lists of resources
 * for their child devices.
 */
struct	resource;

/**
 * @brief An entry for a single resource in a resource list.
 */
struct resource_list_entry {
	SLIST_ENTRY(resource_list_entry) link;
	int	type;			/**< @brief type argument to alloc_resource */
	int	rid;			/**< @brief resource identifier */
	struct	resource *res;		/**< @brief the real resource when allocated */
	u_long	start;			/**< @brief start of resource range */
	u_long	end;			/**< @brief end of resource range */
	u_long	count;			/**< @brief count within range */
};
SLIST_HEAD(resource_list, resource_list_entry);

void	resource_list_init(struct resource_list *rl);
void	resource_list_free(struct resource_list *rl);
void	resource_list_add(struct resource_list *rl,
			  int type, int rid,
			  u_long start, u_long end, u_long count);
int	resource_list_add_next(struct resource_list *rl,
			  int type,
			  u_long start, u_long end, u_long count);
struct resource_list_entry*
	resource_list_find(struct resource_list *rl,
			   int type, int rid);
void	resource_list_delete(struct resource_list *rl,
			     int type, int rid);
struct resource *
	resource_list_alloc(struct resource_list *rl,
			    device_t bus, device_t child,
			    int type, int *rid,
			    u_long start, u_long end,
			    u_long count, u_int flags);
int	resource_list_release(struct resource_list *rl,
			      device_t bus, device_t child,
			      int type, int rid, struct resource *res);
int	resource_list_print_type(struct resource_list *rl,
				 const char *name, int type,
				 const char *format);

/*
 * The root bus, to which all top-level busses are attached.
 */
extern device_t root_bus;
extern devclass_t root_devclass;
void	root_bus_configure(void);

/*
 * Useful functions for implementing busses.
 */

int	bus_generic_activate_resource(device_t dev, device_t child, int type,
				      int rid, struct resource *r);
struct resource *
	bus_generic_alloc_resource(device_t bus, device_t child, int type,
				   int *rid, u_long start, u_long end,
				   u_long count, u_int flags);
int	bus_generic_attach(device_t dev);
int	bus_generic_child_present(device_t dev, device_t child);
int	bus_generic_config_intr(device_t, int, enum intr_trigger,
				enum intr_polarity);
int	bus_generic_deactivate_resource(device_t dev, device_t child, int type,
					int rid, struct resource *r);
int	bus_generic_detach(device_t dev);
void	bus_generic_driver_added(device_t dev, driver_t *driver);
struct resource_list *
	bus_generic_get_resource_list (device_t, device_t);
int	bus_print_child_header(device_t dev, device_t child);
int	bus_print_child_footer(device_t dev, device_t child);
int	bus_generic_print_child(device_t dev, device_t child);
int	bus_generic_probe(device_t dev);
int	bus_generic_read_ivar(device_t dev, device_t child, int which,
			      uintptr_t *result);
int	bus_generic_release_resource(device_t bus, device_t child,
				     int type, int rid, struct resource *r);
int	bus_generic_resume(device_t dev);
int	bus_generic_setup_intr(device_t dev, device_t child,
			       struct resource *irq, int flags,
			       driver_intr_t *intr, void *arg, void **cookiep);

struct resource *
	bus_generic_rl_alloc_resource (device_t, device_t, int, int *,
				       u_long, u_long, u_long, u_int);
void	bus_generic_rl_delete_resource (device_t, device_t, int, int);
int	bus_generic_rl_get_resource (device_t, device_t, int, int, u_long *,
				     u_long *);
int	bus_generic_rl_set_resource (device_t, device_t, int, int, u_long,
				     u_long);
int	bus_generic_rl_release_resource (device_t, device_t, int, int,
					 struct resource *);

int	bus_generic_shutdown(device_t dev);
int	bus_generic_suspend(device_t dev);
int	bus_generic_teardown_intr(device_t dev, device_t child,
				  struct resource *irq, void *cookie);
int	bus_generic_write_ivar(device_t dev, device_t child, int which,
			       uintptr_t value);

/*
 * Wrapper functions for the BUS_*_RESOURCE methods to make client code
 * a little simpler.
 */
struct	resource *bus_alloc_resource(device_t dev, int type, int *rid,
				     u_long start, u_long end, u_long count,
				     u_int flags);
int	bus_activate_resource(device_t dev, int type, int rid,
			      struct resource *r);
int	bus_deactivate_resource(device_t dev, int type, int rid,
				struct resource *r);
int	bus_release_resource(device_t dev, int type, int rid,
			     struct resource *r);
int	bus_setup_intr(device_t dev, struct resource *r, int flags,
		       driver_intr_t handler, void *arg, void **cookiep);
int	bus_teardown_intr(device_t dev, struct resource *r, void *cookie);
int	bus_set_resource(device_t dev, int type, int rid,
			 u_long start, u_long count);
int	bus_get_resource(device_t dev, int type, int rid,
			 u_long *startp, u_long *countp);
u_long	bus_get_resource_start(device_t dev, int type, int rid);
u_long	bus_get_resource_count(device_t dev, int type, int rid);
void	bus_delete_resource(device_t dev, int type, int rid);
int	bus_child_present(device_t child);
int	bus_child_pnpinfo_str(device_t child, char *buf, size_t buflen);
int	bus_child_location_str(device_t child, char *buf, size_t buflen);

static __inline struct resource *
bus_alloc_resource_any(device_t dev, int type, int *rid, u_int flags)
{
	return (bus_alloc_resource(dev, type, rid, 0ul, ~0ul, 1, flags));
}

/*
 * Access functions for device.
 */
device_t	device_add_child(device_t dev, const char *name, int unit);
device_t	device_add_child_ordered(device_t dev, int order,
					 const char *name, int unit);
void	device_busy(device_t dev);
int	device_delete_child(device_t dev, device_t child);
int	device_attach(device_t dev);
int	device_detach(device_t dev);
void	device_disable(device_t dev);
void	device_enable(device_t dev);
device_t	device_find_child(device_t dev, const char *classname,
				  int unit);
const char	*device_get_desc(device_t dev);
devclass_t	device_get_devclass(device_t dev);
driver_t	*device_get_driver(device_t dev);
u_int32_t	device_get_flags(device_t dev);
device_t	device_get_parent(device_t dev);
int	device_get_children(device_t dev, device_t **listp, int *countp);
void	*device_get_ivars(device_t dev);
void	device_set_ivars(device_t dev, void *ivars);
const	char *device_get_name(device_t dev);
const	char *device_get_nameunit(device_t dev);
void	*device_get_softc(device_t dev);
device_state_t	device_get_state(device_t dev);
int	device_get_unit(device_t dev);
struct sysctl_ctx_list *device_get_sysctl_ctx(device_t dev);
struct sysctl_oid *device_get_sysctl_tree(device_t dev);
int	device_is_alive(device_t dev);	/* did probe succeed? */
int	device_is_attached(device_t dev);	/* did attach succeed? */
int	device_is_enabled(device_t dev);
int	device_is_quiet(device_t dev);
int	device_print_prettyname(device_t dev);
int	device_printf(device_t dev, const char *, ...) __printflike(2, 3);
int	device_probe_and_attach(device_t dev);
void	device_quiet(device_t dev);
void	device_set_desc(device_t dev, const char* desc);
void	device_set_desc_copy(device_t dev, const char* desc);
int	device_set_devclass(device_t dev, const char *classname);
int	device_set_driver(device_t dev, driver_t *driver);
void	device_set_flags(device_t dev, u_int32_t flags);
void	device_set_softc(device_t dev, void *softc);
int	device_set_unit(device_t dev, int unit);	/* XXX DONT USE XXX */
int	device_shutdown(device_t dev);
void	device_unbusy(device_t dev);
void	device_verbose(device_t dev);

/*
 * Access functions for devclass.
 */
int	devclass_add_driver(devclass_t dc, kobj_class_t driver);
int	devclass_delete_driver(devclass_t dc, kobj_class_t driver);
devclass_t	devclass_create(const char *classname);
devclass_t	devclass_find(const char *classname);
kobj_class_t	devclass_find_driver(devclass_t dc, const char *classname);
const char	*devclass_get_name(devclass_t dc);
device_t	devclass_get_device(devclass_t dc, int unit);
void	*devclass_get_softc(devclass_t dc, int unit);
int	devclass_get_devices(devclass_t dc, device_t **listp, int *countp);
int	devclass_get_drivers(devclass_t dc, driver_t ***listp, int *countp);
int	devclass_get_count(devclass_t dc);
int	devclass_get_maxunit(devclass_t dc);
int	devclass_find_free_unit(devclass_t dc, int unit);
void	devclass_set_parent(devclass_t dc, devclass_t pdc);
devclass_t	devclass_get_parent(devclass_t dc);
struct sysctl_ctx_list *devclass_get_sysctl_ctx(devclass_t dc);
struct sysctl_oid *devclass_get_sysctl_tree(devclass_t dc);

/*
 * Access functions for device resources.
 */

int	resource_int_value(const char *name, int unit, const char *resname,
			   int *result);
int	resource_long_value(const char *name, int unit, const char *resname,
			    long *result);
int	resource_string_value(const char *name, int unit, const char *resname,
			      const char **result);
int	resource_disabled(const char *name, int unit);
int	resource_find_match(int *anchor, const char **name, int *unit,
			    const char *resname, const char *value);
int	resource_find_dev(int *anchor, const char *name, int *unit,
			  const char *resname, const char *value);
int	resource_set_int(const char *name, int unit, const char *resname,
			 int value);
int	resource_set_long(const char *name, int unit, const char *resname,
			  long value);
int	resource_set_string(const char *name, int unit, const char *resname,
			    const char *value);
/*
 * Functions for maintaining and checking consistency of
 * bus information exported to userspace.
 */
int	bus_data_generation_check(int generation);
void	bus_data_generation_update(void);

/**
 * Some convenience defines for probe routines to return.  These are just
 * suggested values, and there's nothing magical about them.
 * BUS_PROBE_SPECIFIC is for devices that cannot be reprobed, and that no
 * possible other driver may exist (typically legacy drivers who don't fallow
 * all the rules, or special needs drivers).  BUS_PROBE_VENDOR is the
 * suggested value that vendor supplied drivers use.  This is for source or
 * binary drivers that are not yet integrated into the FreeBSD tree.  Its use
 * in the base OS is prohibited.  BUS_PROBE_DEFAULT is the normal return value
 * for drivers to use.  It is intended that nearly all of the drivers in the
 * tree should return this value.  BUS_PROBE_LOW_PRIORITY are for drivers that
 * have special requirements like when there are two drivers that support
 * overlapping series of hardware devices.  In this case the one that supports
 * the older part of the line would return this value, while the one that
 * supports the newer ones would return BUS_PROBE_DEFAULT.  BUS_PROBE_GENERIC
 * is for drivers that wish to have a generic form and a specialized form,
 * like is done with the pci bus and the acpi pci bus.  BUS_PROBE_HOOVER is
 * for those busses that implement a generic device place-holder for devices on
 * the bus that have no more specific driver for them (aka ugen).
 */
#define BUS_PROBE_SPECIFIC	0	/* Only I can use this device */
#define BUS_PROBE_VENDOR	(-10)	/* Vendor supplied driver */
#define BUS_PROBE_DEFAULT	(-20)	/* Base OS default driver */
#define BUS_PROBE_LOW_PRIORITY	(-40)	/* Older, less desirable drivers */
#define BUS_PROBE_GENERIC	(-100)	/* generic driver for dev */
#define BUS_PROBE_HOOVER	(-500)	/* Generic dev for all devs on bus */

/**
 * Shorthand for constructing method tables.
 */
#define	DEVMETHOD	KOBJMETHOD

/*
 * Some common device interfaces.
 */
#include "device_if.h"
#include "bus_if.h"

struct	module;

int	driver_module_handler(struct module *, int, void *);

/**
 * Module support for automatically adding drivers to busses.
 */
struct driver_module_data {
	int		(*dmd_chainevh)(struct module *, int, void *);
	void		*dmd_chainarg;
	const char	*dmd_busname;
	kobj_class_t	dmd_driver;
	devclass_t	*dmd_devclass;
};

#define	DRIVER_MODULE(name, busname, driver, devclass, evh, arg)	\
									\
static struct driver_module_data name##_##busname##_driver_mod = {	\
	evh, arg,							\
	#busname,							\
	(kobj_class_t) &driver,						\
	&devclass							\
};									\
									\
static moduledata_t name##_##busname##_mod = {				\
	#busname "/" #name,						\
	driver_module_handler,						\
	&name##_##busname##_driver_mod					\
};									\
DECLARE_MODULE(name##_##busname, name##_##busname##_mod,		\
	       SI_SUB_DRIVERS, SI_ORDER_MIDDLE)

/**
 * Generic ivar accessor generation macros for bus drivers
 */
#define __BUS_ACCESSOR(varp, var, ivarp, ivar, type)			\
									\
static __inline type varp ## _get_ ## var(device_t dev)			\
{									\
	uintptr_t v;							\
	BUS_READ_IVAR(device_get_parent(dev), dev,			\
	    ivarp ## _IVAR_ ## ivar, &v);				\
	return ((type) v);						\
}									\
									\
static __inline void varp ## _set_ ## var(device_t dev, type t)		\
{									\
	uintptr_t v = (uintptr_t) t;					\
	BUS_WRITE_IVAR(device_get_parent(dev), dev,			\
	    ivarp ## _IVAR_ ## ivar, v);				\
}

#endif /* _KERNEL */

#endif /* !_SYS_BUS_H_ */
