source: rtems/cpukit/libdrvmgr/drvmgr.h @ bef5e23e

/* Driver Manager Interface.
 *
 * COPYRIGHT (c) 2009 Cobham Gaisler AB.
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.org/license/LICENSE.
 */

#ifndef _DRIVER_MANAGER_H_
#define _DRIVER_MANAGER_H_

#include <rtems.h>
#include <drvmgr/drvmgr_list.h>
#include <stdint.h>
#include <rtems/score/basedefs.h>

#ifdef __cplusplus
extern "C" {
#endif

/*** Configure Driver manager ***/

/* Define the number of initialization levels of device drivers */
#define DRVMGR_LEVEL_MAX 4

/* Default to use semahpores for protection. Initialization works without
 * locks and after initialization too if devices are not removed.
 */
#ifndef DRVMGR_USE_LOCKS
#define DRVMGR_USE_LOCKS 1
#endif

struct drvmgr_dev;      /* Device */
struct drvmgr_bus;      /* Bus */
struct drvmgr_drv;      /* Driver */

/*** List Interface shortcuts ***/
#define BUS_LIST_HEAD(list) LIST_HEAD(list, struct drvmgr_bus)
#define BUS_LIST_TAIL(list) LIST_TAIL(list, struct drvmgr_bus)
#define DEV_LIST_HEAD(list) LIST_HEAD(list, struct drvmgr_dev)
#define DEV_LIST_TAIL(list) LIST_TAIL(list, struct drvmgr_dev)
#define DRV_LIST_HEAD(list) LIST_HEAD(list, struct drvmgr_drv)
#define DRV_LIST_TAIL(list) LIST_TAIL(list, struct drvmgr_drv)

/*** Bus indentification ***/
#define DRVMGR_BUS_TYPE_NONE 0          /* Not a valid bus */
#define DRVMGR_BUS_TYPE_ROOT 1          /* Hard coded bus */
#define DRVMGR_BUS_TYPE_PCI 2           /* PCI bus */
#define DRVMGR_BUS_TYPE_AMBAPP 3        /* AMBA Plug & Play bus */
#define DRVMGR_BUS_TYPE_LEON2_AMBA 4    /* LEON2 hardcoded bus */
#define DRVMGR_BUS_TYPE_AMBAPP_DIST 5   /* Distibuted AMBA Plug & Play bus accessed using a communication interface */
#define DRVMGR_BUS_TYPE_SPW_RMAP 6      /* SpaceWire Network bus */
#define DRVMGR_BUS_TYPE_AMBAPP_RMAP 7   /* SpaceWire RMAP accessed AMBA Plug & Play bus */

enum {
        DRVMGR_OBJ_NONE = 0,
        DRVMGR_OBJ_DRV = 1,
        DRVMGR_OBJ_BUS = 2,
        DRVMGR_OBJ_DEV = 3,
};

/*** Driver indentification ***
 *
 * 64-bit identification integer definition
 *  * Bus ID 8-bit [7..0]
 *  * Reserved 8-bit field [63..56]
 *  * Device ID specific for bus type 48-bit [55..8]  (Different buses have
 *    different unique identifications for hardware/driver.)
 *
 * ID Rules
 *  * A root bus driver must always have device ID set to 0. There can only by
 *    one root bus driver for a certain bus type.
 *  * A Driver ID must identify a unique hardware core
 *
 */

/* Bus ID Mask */
#define DRIVER_ID_BUS_MASK 0x00000000000000FFULL

/* Reserved Mask for future use */
#define DRIVER_ID_RSV_MASK 0xFF00000000000000ULL

/* Reserved Mask for future use */
#define DRIVER_ID_DEV_MASK 0x00FFFFFFFFFFFF00ULL

/* Set Bus ID Mask. */
#define DRIVER_ID(busid, devid) ((unsigned long long) \
        ((((unsigned long long)(devid) << 8) & DRIVER_ID_DEV_MASK) | \
         ((unsigned long long)(busid) & DRIVER_ID_BUS_MASK)))

/* Get IDs */
#define DRIVER_BUSID_GET(id)    ((unsigned long long)(id) & DRIVER_ID_BUS_MASK)
#define DRIVER_DEVID_GET(id)    (((unsigned long long)(id) & DRIVER_ID_DEV_MASK) >> 8)

#define DRIVER_ROOTBUS_ID(bus_type)     DRIVER_ID(bus_type, 0)

/*** Root Bus drivers ***/

/* Generic Hard coded Root bus: Driver ID */
#define DRIVER_ROOT_ID          DRIVER_ROOTBUS_ID(DRVMGR_BUS_TYPE_ROOT)

/* PCI Plug & Play bus: Driver ID */
#define DRIVER_PCIBUS_ID        DRIVER_ROOTBUS_ID(DRVMGR_BUS_TYPE_PCI)

/* AMBA Plug & Play bus: Driver ID */
#define DRIVER_GRLIB_AMBAPP_ID  DRIVER_ROOTBUS_ID(DRVMGR_BUS_TYPE_AMBAPP)

/* AMBA Hard coded bus: Driver ID */
#define DRIVER_LEON2_AMBA_ID    DRIVER_ROOTBUS_ID(DRVMGR_BUS_TYPE_LEON2_AMBA)

/* Distributed AMBA Plug & Play bus: Driver ID */
#define DRIVER_AMBAPP_DIST_ID   DRIVER_ROOTBUS_ID(DRVMGR_BUS_TYPE_AMBAPP_DIST)

/*! Bus parameters used by driver interface functions to aquire information
 * about bus. All Bus drivers should implement the operation 'get_params' so
 * that the driver interface routines can access bus dependent information in
 * an non-dependent way.
 */
struct drvmgr_bus_params {
        char            *dev_prefix;            /*!< Optional name prefix */
};

/* Interrupt Service Routine (ISR) */
typedef void (*drvmgr_isr)(void *arg);

/*! Bus operations */
struct drvmgr_bus_ops {
        /* Functions used internally within driver manager */
        int     (*init[DRVMGR_LEVEL_MAX])(struct drvmgr_bus *);
        int     (*remove)(struct drvmgr_bus *);
        int     (*unite)(struct drvmgr_drv *, struct drvmgr_dev *);     /*!< Unite Hardware Device with Driver */

        /* Functions called indirectly from drivers */
        int     (*int_register)(struct drvmgr_dev *, int index, const char *info, drvmgr_isr isr, void *arg);
        int     (*int_unregister)(struct drvmgr_dev *, int index, drvmgr_isr isr, void *arg);
        int     (*int_clear)(struct drvmgr_dev *, int index);
        int     (*int_mask)(struct drvmgr_dev *, int index);
        int     (*int_unmask)(struct drvmgr_dev *, int index);

        /* Get Parameters */
        int     (*get_params)(struct drvmgr_dev *, struct drvmgr_bus_params *);
        /* Get Frequency of Bus */
        int     (*get_freq)(struct drvmgr_dev*, int, unsigned int*);
        /*! Function called to request information about a device. The bus
         *  driver interpret the bus-specific information about the device.
         */
        void    (*get_info_dev)(struct drvmgr_dev *,
                                void (*print)(void *p, char *str), void *p);
};
#define BUS_OPS_NUM (sizeof(struct drvmgr_bus_ops)/sizeof(void (*)(void)))

struct drvmgr_func {
        int funcid;
        void *func;
};
#define DRVMGR_FUNC(_ID_, _FUNC_) {(int)(_ID_), (void *)(_FUNC_)}
#define DRVMGR_FUNC_END {0, NULL}

/*** Resource definitions ***
 *
 * Overview of structures:
 *  All bus resources entries (_bus_res) are linked together per bus
 *  (bus_info->reslist). One bus resource entry has a pointer to an array of
 *  driver resources (_drv_res). One driver resouces is made out of an array
 *  of keys (drvmgr_key). All keys belongs to the same driver and harwdare
 *  device. Each key has a Name, Type ID and Data interpreted differently
 *  depending on the Type ID (union drvmgr_key_value).
 *
 */

/* Key Data Types */
enum drvmgr_kt {
        DRVMGR_KT_ANY = -1,
        DRVMGR_KT_NONE = 0,
        DRVMGR_KT_INT = 1,
        DRVMGR_KT_STRING = 2,
        DRVMGR_KT_POINTER = 3,
};

#define DRVMGR_KEY_EMPTY        {NULL, DRVMGR_KT_NONE, {0}}
#define DRVMGR_RES_EMPTY        {0, 0, NULL}
#define MMAP_EMPTY      {0, 0, 0}

/*! Union of different values */
union drvmgr_key_value {
        unsigned int            i;      /*!< Key data type UNSIGNED INTEGER */
        char                    *str;   /*!< Key data type STRING */
        void                    *ptr;   /*!< Key data type ADDRESS/POINTER */
};

/* One key. One Value. Holding information relevant to the driver. */
struct drvmgr_key {
        char                    *key_name;      /* Name of key */
        enum drvmgr_kt          key_type;       /* How to interpret key_value */
        union drvmgr_key_value  key_value;      /* The value or pointer to value */
};

/*! Driver resource entry, Driver resources for a certain device instance,
 *  containing a number of keys where each key hold the data of interest.
 */
struct drvmgr_drv_res {
        uint64_t                drv_id;         /*!< Identifies the driver this resource is aiming */
        int                     minor_bus;      /*!< Indentifies a specfic device */
        struct drvmgr_key       *keys;          /*!< First key in key array, ended with KEY_EMPTY */
};

/*! Bus resource list node */
struct drvmgr_bus_res {
        struct drvmgr_bus_res   *next;          /*!< Next resource node in list */
        struct drvmgr_drv_res   resource[];     /*!< Array of resources, one per device instance */
};

/*! MAP entry. Describes an linear address space translation. Untranslated
 *  Start, Translated Start and length.
 *
 * Used by bus drivers to describe the address translation needed for
 * the translation driver interface.
 */
struct drvmgr_map_entry {
        char            *name;          /*!< Map Name */
        unsigned int    size;           /*!< Size of map window */
        char            *from_adr;      /*!< Start address of access window used
                                         *   to reach into remote bus */
        char            *to_adr;        /*!< Start address of remote system
                                         *   address range */
};
#define DRVMGR_TRANSLATE_ONE2ONE        NULL
#define DRVMGR_TRANSLATE_NO_BRIDGE      ((void *)1)  /* No bridge, error */

/*! Bus information. Describes a bus. */
struct drvmgr_bus {
        int                     obj_type;       /*!< DRVMGR_OBJ_BUS */
        unsigned char           bus_type;       /*!< Type of bus */
        unsigned char           depth;          /*!< Bus level distance from root bus */
        struct drvmgr_bus       *next;          /*!< Next Bus */
        struct drvmgr_dev       *dev;           /*!< Bus device, the hardware... */
        void                    *priv;          /*!< Private data structure used by BUS driver */
        struct drvmgr_dev       *children;      /*!< Hardware devices on this bus */
        struct drvmgr_bus_ops   *ops;           /*!< Bus operations supported by this bus driver */
        struct drvmgr_func      *funcs;         /*!< Extra operations */
        int                     dev_cnt;        /*!< Number of devices this bus has */
        struct drvmgr_bus_res   *reslist;       /*!< Bus resources, head of a linked list of resources. */
        struct drvmgr_map_entry *maps_up;       /*!< Map Translation, array of address spaces upstreams to CPU */
        struct drvmgr_map_entry *maps_down;     /*!< Map Translation, array of address spaces downstreams to Hardware */

        /* Bus status */
        int                     level;          /*!< Initialization Level of Bus */
        int                     state;          /*!< Init State of Bus, BUS_STATE_* */
        int                     error;          /*!< Return code from bus->ops->initN() */
};

/* States of a bus */
#define BUS_STATE_INIT_FAILED   0x00000001      /* Initialization Failed */
#define BUS_STATE_LIST_INACTIVE 0x00001000      /* In inactive bus list */
#define BUS_STATE_DEPEND_FAILED 0x00000004      /* Device init failed */

/* States of a device */
#define DEV_STATE_INIT_FAILED   0x00000001      /* Initialization Failed */
#define DEV_STATE_INIT_DONE     0x00000002      /* All init levels completed */
#define DEV_STATE_DEPEND_FAILED 0x00000004      /* Parent Bus init failed */
#define DEV_STATE_UNITED        0x00000100      /* Device United with Device Driver */
#define DEV_STATE_REMOVED       0x00000200      /* Device has been removed (unregistered) */
#define DEV_STATE_IGNORED       0x00000400      /* Device was ignored according to user's request, the device
                                                 * was never reported to it's driver (as expected).
                                                 */
#define DEV_STATE_LIST_INACTIVE 0x00001000      /* In inactive device list */

/*! Device information */
struct drvmgr_dev {
        int                     obj_type;       /*!< DRVMGR_OBJ_DEV */
        struct drvmgr_dev       *next;          /*!< Next device */
        struct drvmgr_dev       *next_in_bus;   /*!< Next device on the same bus */
        struct drvmgr_dev       *next_in_drv;   /*!< Next device using the same driver */

        struct drvmgr_drv       *drv;           /*!< The driver owning this device */
        struct drvmgr_bus       *parent;        /*!< Bus that this device resides on */
        short                   minor_drv;      /*!< Device number within driver */
        short                   minor_bus;      /*!< Device number on bus (for device separation) */
        char                    *name;          /*!< Name of Device Hardware */
        void                    *priv;          /*!< Pointer to driver private device structure */
        void                    *businfo;       /*!< Host bus specific information */
        struct drvmgr_bus       *bus;           /*!< Pointer to bus, set only if this is a bridge */

        /* Device Status */
        unsigned int            state;          /*!< State of device, see DEV_STATE_* */
        int                     level;          /*!< Init Level */
        int                     error;          /*!< Error state returned by driver */
};

/*! Driver operations, function pointers. */
struct drvmgr_drv_ops {
        int     (*init[DRVMGR_LEVEL_MAX])(struct drvmgr_dev *); /*! Function doing Init Stage 1 of a hardware device */
        int     (*remove)(struct drvmgr_dev *); /*! Function called when device instance is to be removed */
        int     (*info)(struct drvmgr_dev *, void (*print)(void *p, char *str), void *p, int, char *argv[]);/*! Function called to request information about a device or driver */
};
#define DRV_OPS_NUM (sizeof(struct drvmgr_drv_ops)/sizeof(void (*)(void)))

/*! Device driver description */
struct drvmgr_drv {
        int                     obj_type;       /*!< DRVMGR_OBJ_DRV */
        struct drvmgr_drv       *next;          /*!< Next Driver */
        struct drvmgr_dev       *dev;           /*!< Devices using this driver */

        uint64_t                drv_id;         /*!< Unique Driver ID */
        char                    *name;          /*!< Name of Driver */
        int                     bus_type;       /*!< Type of Bus this driver supports */
        struct drvmgr_drv_ops   *ops;           /*!< Driver operations */
        struct drvmgr_func      *funcs;         /*!< Extra Operations */
        unsigned int            dev_cnt;        /*!< Number of devices in dev */
        unsigned int            dev_priv_size;  /*!< If non-zero DRVMGR will allocate memory for dev->priv */
};

/*! Structure defines a function pointer called when driver manager is ready
 *  for drivers to register themselfs. Used to select drivers available to the
 *  driver manager.
 */
struct drvmgr_drv_reg_func {
        void (*drv_reg)(void);
};

/*** DRIVER | DEVICE | BUS FUNCTIONS ***/

/* Return Codes */
enum {
        DRVMGR_OK = 0,          /* Sucess */
        DRVMGR_NOMEM = 1,       /* Memory allocation error */
        DRVMGR_EIO = 2,         /* I/O error */
        DRVMGR_EINVAL = 3,      /* Invalid parameter */
        DRVMGR_ENOSYS = 4,
        DRVMGR_TIMEDOUT = 5,    /* Operation timeout error */
        DRVMGR_EBUSY = 6,
        DRVMGR_ENORES = 7,      /* Not enough resources */
        DRVMGR_FAIL = -1        /* Unspecified failure */
};

/*! Initialize data structures of the driver management system.
 *  Calls predefined register driver functions so that drivers can
 *  register themselves.
 */
extern void _DRV_Manager_initialization(void);

/*! Take all devices into init level 'level', all devices registered later
 *  will directly be taken into this level as well, ensuring that all
 *  registerd devices has been taken into the level.
 *
 */
extern void _DRV_Manager_init_level(int level);

/*! This function must be defined by the BSP when the driver manager is enabled
 * and initialized during BSP initialization. The function is called after a
 * init level is reached the first time by the driver manager.
 */
extern void bsp_driver_level_hook(int level);

/*! Init driver manager all in one go, will call _DRV_Manager_initialization(),
 *  then _DRV_Manager_init_level([1..DRVMGR_LEVEL_MAX]).
 *  Typically called from Init task when user wants to initilize driver
 *  manager after startup, otherwise not used.
 */
extern int drvmgr_init(void);

/* Take registered buses and devices into the correct init level,
 * this function is called from _init_level() so normally
 * we don't need to call it directly.
 */
extern void drvmgr_init_update(void);

/*! Register Root Bus device driver */
extern int drvmgr_root_drv_register(struct drvmgr_drv *drv);

/*! Register a driver */
extern int drvmgr_drv_register(struct drvmgr_drv *drv);

/*! Register a device */
extern int drvmgr_dev_register(struct drvmgr_dev *dev);

/*! Remove a device, and all its children devices if device is a bus device. The
 *  device driver will be requested to remove the device and once gone from bus,
 *  device and driver list the device is put into a inactive list for debugging
 *  (this is optional by using remove argument).
 *
 * Removing the Root Bus Device is not supported.
 *
 * \param remove If non-zero the device will be deallocated, and not put into
 *               the inacitve list.
 */
extern int drvmgr_dev_unregister(struct drvmgr_dev *dev);

/*! Register a bus */
extern int drvmgr_bus_register(struct drvmgr_bus *bus);

/*! Unregister a bus */
extern int drvmgr_bus_unregister(struct drvmgr_bus *bus);

/*! Unregister all child devices of a bus.
 *
 * This function is called from the bus driver, from a "safe" state where
 * devices will not be added or removed on this particular bus at this time
 */
extern int drvmgr_children_unregister(struct drvmgr_bus *bus);

/* Separate a device from the driver it has been united with */
extern int drvmgr_dev_drv_separate(struct drvmgr_dev *dev);

/*! Allocate a device structure, if no memory available
 *  rtems_error_fatal_occurred is called.
 * The 'extra' argment tells how many bytes extra space is to be allocated after
 * the device structure, this is typically used for "businfo" structures. The extra
 * space is always aligned to a 4-byte boundary.
 */
extern int drvmgr_alloc_dev(struct drvmgr_dev **pdev, int extra);

/*! Allocate a bus structure, if no memory available rtems_error_fatal_occurred
 * is called.
 * The 'extra' argment tells how many bytes extra space is to be allocated after
 * the device structure, this is typically used for "businfo" structures. The
 * extra space is always aligned to a 4-byte boundary.
 */
extern int drvmgr_alloc_bus(struct drvmgr_bus **pbus, int extra);

/*** DRIVER RESOURCE FUNCTIONS ***/

/*! Add resources to a bus, typically used by a bus driver.
 *
 * \param bus   The Bus to add the resources to.
 * \param res   An array with Driver resources, all together are called bus
 *              resources.
 */
extern void drvmgr_bus_res_add(struct drvmgr_bus *bus,
                                        struct drvmgr_bus_res *bres);

/*! Find all the resource keys for a device among all driver resources on a
 *  bus. Typically used by a device driver to get configuration options.
 *
 * \param dev   Device to find resources for
 * \param key   Location where the pointer to the driver resource array (drvmgr_drv_res->keys) is stored.
 */
extern int drvmgr_keys_get(struct drvmgr_dev *dev, struct drvmgr_key **keys);

/*! Return the one key that matches key name from a driver keys array. The keys
 *  can be obtained using drvmgr_keys_get().
 *
 * \param keys       An array of keys ended with DRVMGR_KEY_EMPTY to search among.
 * \param key_name   Name of key to search for among the keys.
 */
extern struct drvmgr_key *drvmgr_key_get(struct drvmgr_key *keys, char *key_name);

/*! Extract key value from the key in the keys array matching name and type.
 *
 *  This function calls drvmgr_keys_get to get the key requested (from key
 *  name), then determines if the type is correct. A pointer to the key value
 *  is returned.
 *
 *  \param keys       An array of keys ended with DRVMGR_KEY_EMPTY to search among.
 *  \param key_name   Name of key to search for among the keys.
 *  \param key_type   Data Type of value. INTEGER, ADDRESS, STRING.
 *  \return           Returns NULL if no value found matching Key Name and Key
 *                    Type.
 */
extern union drvmgr_key_value *drvmgr_key_val_get(
        struct drvmgr_key *keys,
        char *key_name,
        enum drvmgr_kt key_type);

/*! Get key value from the bus resources matching [device, key name, key type]
 *  if no matching key is found NULL is returned.
 *
 * This is typically used by device drivers to find a particular device
 * resource.
 *
 * \param dev         The device to search resource for.
 * \param key_name    The key name to search for
 * \param key_type    The key type expected.
 * \return            Returns NULL if no value found matching Key Name and
 *                    Key Type was found for device.
 */
extern union drvmgr_key_value *drvmgr_dev_key_get(
        struct drvmgr_dev *dev,
        char *key_name,
        enum drvmgr_kt key_type);

/*** DRIVER INTERACE USED TO REQUEST INFORMATION/SERVICES FROM BUS DRIVER ***/

/*! Get parent bus */
RTEMS_INLINE_ROUTINE struct drvmgr_bus *drvmgr_get_parent(
        struct drvmgr_dev *dev)
{
        if (dev)
                return dev->parent;
        else
                return NULL;
}

/*! Get Driver of device */
RTEMS_INLINE_ROUTINE struct drvmgr_drv *drvmgr_get_drv(struct drvmgr_dev *dev)
{
        if (dev)
                return dev->drv;
        else
                return NULL;
}

/*! Calls func() for every device found in the device tree, regardless of
 * device state or if a driver is assigned. With the options argument the user
 * can decide to do either a depth-first or a breadth-first search.
 *
 * If the function func() returns a non-zero value then for_each_dev will
 * return imediatly with the same return value as func() returned.
 *
 * \param func       Function called on each device
 * \param arg        Custom function argument
 * \param options    Search Options, see DRVMGR_FED_*
 *
 */
#define DRVMGR_FED_BF 1         /* Breadth-first search */
#define DRVMGR_FED_DF 0         /* Depth first search */
extern int drvmgr_for_each_dev(
        int (*func)(struct drvmgr_dev *dev, void *arg),
        void *arg,
        int options);

/*! Get Device pointer from Driver and Driver minor number
 *
 * \param drv         Driver the device is united with.
 * \param minor       Driver minor number assigned to device.
 * \param pdev        Location where the Device point will be stored.
 * \return            Zero on success. -1 on failure, when device was not
 *                    found in driver device list.
 */
extern int drvmgr_get_dev(
        struct drvmgr_drv *drv,
        int minor,
        struct drvmgr_dev **pdev);

/*! Get Bus frequency in Hertz. Frequency is stored into address of freq_hz.
 *
 * \param dev        The Device to get Bus frequency for.
 * \param options    Bus-type specific options
 * \param freq_hz    Location where Bus Frequency will be stored.
 */
extern int drvmgr_freq_get(
        struct drvmgr_dev *dev,
        int options,
        unsigned int *freq_hz);

/*! Return 0 if dev is not located on the root bus, 1 if on root bus */
extern int drvmgr_on_rootbus(struct drvmgr_dev *dev);

/*! Get device name prefix, this name can be used to register a unique name in
 *  the bus->error filesystem or to get an idea where the device is located.
 *
 * \param dev         The Device to get the device Prefix for.
 * \param dev_prefix  Location where the prefix will be stored.
 */
extern int drvmgr_get_dev_prefix(struct drvmgr_dev *dev, char *dev_prefix);

/*! Register a shared interrupt handler. Since this service is shared among
 *  interrupt drivers/handlers the handler[arg] must be installed before the
 *  interrupt can be cleared or disabled. The handler is by default disabled
 *  after registration.
 *
 *  \param index      Index is used to identify the IRQ number if hardware has
 *                    multiple IRQ sources. Normally Index is set to 0 to
 *                    indicated the first and only IRQ source.
 *                    A negative index is interpreted as a absolute bus IRQ
 *                    number.
 *  \param isr        Interrupt Service Routine.
 *  \param arg        Optional ISR argument.
 */
extern int drvmgr_interrupt_register(
        struct drvmgr_dev *dev,
        int index,
        const char *info,
        drvmgr_isr isr,
        void *arg);

/*! Unregister an interrupt handler. This also disables the interrupt before
 *  unregistering the interrupt handler.
 *  \param index      Index is used to identify the IRQ number if hardware has
 *                    multiple IRQ sources. Normally Index is set to 0 to
 *                    indicated the first and only IRQ source.
 *                    A negative index is interpreted as a absolute bus IRQ
 *                    number.
 *  \param isr        Interrupt Service Routine, previously registered.
 *  \param arg        Optional ISR argument, previously registered.
 */
extern int drvmgr_interrupt_unregister(
        struct drvmgr_dev *dev,
        int index,
        drvmgr_isr isr,
        void *arg);

/*! Clear (ACK) pending interrupt
 *
 *  \param dev        Device to clear interrupt for.
 *  \param index      Index is used to identify the IRQ number if hardware has multiple IRQ sources.
 *                    Normally Index is set to 0 to indicated the first and only IRQ source.
 *                    A negative index is interpreted as a absolute bus IRQ number.
 *  \param isr        Interrupt Service Routine, previously registered.
 *  \param arg        Optional ISR argument, previously registered.
 */
extern int drvmgr_interrupt_clear(
        struct drvmgr_dev *dev,
        int index);

/*! Force unmasking/enableing an interrupt on the interrupt controller, this is not normally used,
 *  if used the caller has masked/disabled the interrupt just before.
 *
 *  \param dev        Device to clear interrupt for.
 *  \param index      Index is used to identify the IRQ number if hardware has multiple IRQ sources.
 *                    Normally Index is set to 0 to indicated the first and only IRQ source.
 *                    A negative index is interpreted as a absolute bus IRQ number.
 *  \param isr        Interrupt Service Routine, previously registered.
 *  \param arg        Optional ISR argument, previously registered.
 */
extern int drvmgr_interrupt_unmask(
        struct drvmgr_dev *dev,
        int index);

/*! Force masking/disable an interrupt on the interrupt controller, this is not normally performed
 *  since this will stop all other (shared) ISRs to be disabled until _unmask() is called.
 *
 *  \param dev        Device to mask interrupt for.
 *  \param index      Index is used to identify the IRQ number if hardware has multiple IRQ sources.
 *                    Normally Index is set to 0 to indicated the first and only IRQ source.
 *                    A negative index is interpreted as a absolute bus IRQ number.
 */
extern int drvmgr_interrupt_mask(
        struct drvmgr_dev *dev,
        int index);

/*! drvmgr_translate() translation options */
enum drvmgr_tr_opts {
        /* Translate CPU RAM Address (input) to DMA unit accessible address
         * (output), this is an upstreams translation in reverse order.
         *
         * Typical Usage:
         * It is common to translate a CPU accessible RAM address to an
         * address that DMA units can access over bridges.
         */
        CPUMEM_TO_DMA = 0x0,

        /* Translate DMA Unit Accessible address mapped to CPU RAM (input) to
         * CPU accessible address (output). This is an upstreams translation.
         *
         * Typical Usage (not often used):
         * The DMA unit descriptors contain pointers to DMA buffers located at
         * CPU RAM addresses that the DMA unit can access, the CPU processes
         * the descriptors and want to access the data but a translation back
         * to CPU address is required.
         */
        CPUMEM_FROM_DMA = 0x1,

        /* Translate DMA Memory Address (input) to CPU accessible address
         * (output), this is a downstreams translation in reverse order.
         *
         * Typical Usage:
         * A PCI network card puts packets into its memory not doing DMA over
         * PCI, in order for the CPU to access them the PCI address must be
         * translated.
         */
        DMAMEM_TO_CPU = 0x2,

        /* Translate CPU accessible address (input) mapped to DMA Memory Address
         * to DMA Unit accessible address (output). This is a downstreams
         * translation.
         */
        DMAMEM_FROM_CPU = 0x3,
};
#define DRVMGR_TR_REVERSE 0x1   /* do reverse translation direction order */
#define DRVMGR_TR_PATH 0x2      /* 0x0=down-stream 0x2=up-stream address path */
 
/*! Translate an address on one bus to an address on another bus.
 *
 *  The device determines source or destination bus, the root bus is always
 *  the other bus. It is assumed that the CPU is located on the root bus or
 *  that it can access it without address translation (mapped 1:1). The CPU
 *  is thus assumed to be located on level 0 top most in the bus hierarchy.
 *
 *  If no map is present in the bus driver src_address is translated 1:1
 *  (just copied).
 *
 *  Addresses are typically converted up-streams from the DMA unit towards the
 *  CPU (DMAMEM_TO_CPU) or down-streams towards DMA hardware from the CPU
 *  (CPUMEM_TO_DMA) over one or multiple bridges depending on bus architecture.
 *  See 'enum drvmgr_tr_opts' for other translation direction options.
 *  For example:
 *  Two common operations is to translate a CPU accessible RAM address to an
 *  address that DMA units can access (dev=DMA-unit, CPUMEM_TO_DMA,
 *  src_address=CPU-RAM-ADR) and to translate an address of a PCI resource for
 *  example RAM mapped into a PCI BAR to an CPU accessible address
 *  (dev=PCI-device, DMAMEM_TO_CPU, src_address=PCI-BAR-ADR).
 *
 *  Source address is translated and the result is put into *dst_address, if
 *  the address is not accessible on the other bus -1 is returned.
 *
 *  \param dev             Device to translate addresses for
 *  \param options         Tanslation direction options, see enum drvmgr_tr_opts
 *  \param src_address     Address to translate
 *  \param dst_address     Location where translated address is stored
 *
 *  Returns 0 if unable to translate. The remaining length from the given
 *  address of the map is returned on success, for example if a map starts
 *  at 0x40000000 of size 0x100000 the result will be 0x40000 if the address
 *  was translated into 0x400C0000.
 *  If dev is on root-bus no translation is performed 0xffffffff is returned
 *  and src_address is stored in *dst_address.
 */
extern unsigned int drvmgr_translate(
        struct drvmgr_dev *dev,
        unsigned int options,
        void *src_address,
        void **dst_address);

/* Translate addresses between buses, used internally to implement
 * drvmgr_translate. Function is not limited to translate from/to root bus
 * where CPU is resident, however buses must be on a straight path relative
 * to each other (parent of parent of parent and so on).
 *
 * \param from         src_address is given for this bus
 * \param to           src_address is translated to this bus
 * \param reverse      Selects translation method, if map entries are used in
 *                     the reverse order (map_up->to is used as map_up->from)
 * \param src_address  Address to be translated
 * \param dst_address  Translated address is stored here on success (return=0)
 *
 *  Returns 0 if unable to translate. The remaining length from the given
 *  address of the map is returned on success and the result is stored into
 *  *dst_address. For example if a map starts at 0x40000000 of size 0x100000
 *  the result will be 0x40000 if the address was translated into 0x400C0000.
 *  If dev is on root-bus no translation is performed 0xffffffff is returned.
 *  and src_address is stored in *dst_address.
 */
extern unsigned int drvmgr_translate_bus(
        struct drvmgr_bus *from,
        struct drvmgr_bus *to,
        int reverse,
        void *src_address,
        void **dst_address);

/* Calls drvmgr_translate() to translate an address range and checks the result,
 * a printout is generated if the check fails. All parameters are passed on to
 * drvmgr_translate() except for size, see paramters of drvmgr_translate().
 *
 * If size=0 only the starting address is not checked.
 *
 * If mapping failes a non-zero result is returned.
 */
extern int drvmgr_translate_check(
        struct drvmgr_dev *dev,
        unsigned int options,
        void *src_address,
        void **dst_address,
        unsigned int size);

/*! Get function pointer from Device Driver or Bus Driver.
 *
 *  Returns 0 if function is available
 */
extern int drvmgr_func_get(void *obj, int funcid, void **func);

/*! Lookup function and call it directly with the four optional arguments */
extern int drvmgr_func_call(void *obj, int funcid, void *a, void *b, void *c, void *d);

/* Builds a Function ID.
 *
 * Used to request optional functions by a bus or device driver
 */
#define DRVMGR_FUNCID(major, minor) ((((major) & 0xfff) << 20) | ((minor) & 0xfffff))
#define DRVMGR_FUNCID_NONE 0
#define DRVMGR_FUNCID_END DRVMGR_FUNCID(DRVMGR_FUNCID_NONE, 0)

/* Major Function ID. Most significant 12-bits. */
enum {
        FUNCID_NONE             = 0x000,
        FUNCID_RW               = 0x001, /* Read/Write functions */
};

/* Select Sub-Function Read/Write function by ID */
#define RW_SIZE_1   0x00001    /* Access Size */
#define RW_SIZE_2   0x00002
#define RW_SIZE_4   0x00004
#define RW_SIZE_8   0x00008
#define RW_SIZE_ANY 0x00000
#define RW_SIZE(id) ((unsigned int)(id) & 0xf)

#define RW_DIR_ANY  0x00000   /* Access Direction */
#define RW_READ     0x00000   /* Read */
#define RW_WRITE    0x00010   /* Write */
#define RW_SET      0x00020   /* Write with same value (memset) */
#define RW_DIR(id)  (((unsigned int)(id) >> 4) & 0x3)

#define RW_RAW      0x00000  /* Raw access - no swapping (machine default) */
#define RW_LITTLE   0x00040  /* Little Endian */
#define RW_BIG      0x00080  /* Big Endian */
#define RW_ENDIAN(id) (((unsigned int)(id) >> 6) & 0x3)

#define RW_TYPE_ANY 0x00000  /* Access type */
#define RW_REG      0x00100
#define RW_MEM      0x00200
#define RW_MEMREG   0x00300
#define RW_CFG      0x00400
#define RW_TYPE(id) (((unsigned int)(id) >> 8) & 0xf)

#define RW_ARG      0x01000 /* Optional Argument */
#define RW_ERR      0x02000 /* Optional Error Handler */

/* Build a Read/Write function ID */
#define DRVMGR_RWFUNC(minor) DRVMGR_FUNCID(FUNCID_RW, minor)

/* Argument to Read/Write functions, the "void *arg" pointer is returned by
 * RW_ARG. If NULL is returned no argument is needed.
 */
struct drvmgr_rw_arg {
        void *arg;
        struct drvmgr_dev *dev;
};

/* Standard Read/Write function types */
typedef uint8_t (*drvmgr_r8)(uint8_t *srcadr);
typedef uint16_t (*drvmgr_r16)(uint16_t *srcadr);
typedef uint32_t (*drvmgr_r32)(uint32_t *srcadr);
typedef uint64_t (*drvmgr_r64)(uint64_t *srcadr);
typedef void (*drvmgr_w8)(uint8_t *dstadr, uint8_t data);
typedef void (*drvmgr_w16)(uint16_t *dstadr, uint16_t data);
typedef void (*drvmgr_w32)(uint32_t *dstadr, uint32_t data);
typedef void (*drvmgr_w64)(uint64_t *dstadr, uint64_t data);
/* READ/COPY a memory area located on bus into CPU memory.
 * From 'src' (remote) to the destination 'dest' (local), n=number of bytes
 */
typedef int (*drvmgr_rmem)(void *dest, const void *src, int n);
/* WRITE/COPY a user buffer located in CPU memory to a location on the bus.
 * From 'src' (local) to the destination 'dest' (remote), n=number of bytes
 */
typedef int (*drvmgr_wmem)(void *dest, const void *src, int n);
/* Set a memory area to the byte value given in c, see LIBC memset(). Memset is
 * implemented by calling wmem() multiple times with a "large" buffer.
 */
typedef int (*drvmgr_memset)(void *dstadr, int c, size_t n);

/* Read/Write function types with additional argument */
typedef uint8_t (*drvmgr_r8_arg)(uint8_t *srcadr, void *a);
typedef uint16_t (*drvmgr_r16_arg)(uint16_t *srcadr, void *a);
typedef uint32_t (*drvmgr_r32_arg)(uint32_t *srcadr, void *a);
typedef uint64_t (*drvmgr_r64_arg)(uint64_t *srcadr, void *a);
typedef void (*drvmgr_w8_arg)(uint8_t *dstadr, uint8_t data, void *a);
typedef void (*drvmgr_w16_arg)(uint16_t *dstadr, uint16_t data, void *a);
typedef void (*drvmgr_w32_arg)(uint32_t *dstadr, uint32_t data, void *a);
typedef void (*drvmgr_w64_arg)(uint64_t *dstadr, uint64_t data, void *a);
typedef int (*drvmgr_rmem_arg)(void *dest, const void *src, int n, void *a);
typedef int (*drvmgr_wmem_arg)(void *dest, const void *src, int n, void *a);
typedef int (*drvmgr_memset_arg)(void *dstadr, int c, size_t n, void *a);

/* Report an error to the parent bus of the device */
typedef void (*drvmgr_rw_err)(struct drvmgr_rw_arg *a, struct drvmgr_bus *bus,
                                int funcid, void *adr);

/* Helper function for buses that implement the memset() over wmem() */
extern void drvmgr_rw_memset(
        void *dstadr,
        int c,
        size_t n,
        void *a,
        drvmgr_wmem_arg wmem
        );

/*** PRINT INFORMATION ABOUT DRIVER MANAGER ***/

/*! Calls func() for every device found matching the search requirements of
 * set_mask and clr_mask. Each bit set in set_mask must be set in the
 * device state bit mask (dev->state), and Each bit in the clr_mask must
 * be cleared in the device state bit mask (dev->state). There are three
 * special cases:
 *
 * 1. If state_set_mask and state_clr_mask are zero the state bits are
 *    ignored and all cores are treated as a match.
 *
 * 2. If state_set_mask is zero the function func will not be called due to
 *    a bit being set in the state mask.
 *
 * 3. If state_clr_mask is zero the function func will not be called due to
 *    a bit being cleared in the state mask.
 *
 * If the function func() returns a non-zero value then for_each_dev will
 * return imediatly with the same return value as func() returned.
 *
 * \param devlist            The list to iterate though searching for devices.
 * \param state_set_mask     Defines the bits that must be set in dev->state
 * \param state_clr_mask     Defines the bits that must be cleared in dev->state
 * \param func               Function called on each
 *
 */
extern int drvmgr_for_each_listdev(
        struct drvmgr_list *devlist,
        unsigned int state_set_mask,
        unsigned int state_clr_mask,
        int (*func)(struct drvmgr_dev *dev, void *arg),
        void *arg);

/* Print all devices */
#define PRINT_DEVS_FAILED       0x01    /* Failed during initialization */
#define PRINT_DEVS_ASSIGNED     0x02    /* Driver assigned */
#define PRINT_DEVS_UNASSIGNED   0x04    /* Driver not assigned */
#define PRINT_DEVS_IGNORED      0x08    /* Device ignored on user's request */
#define PRINT_DEVS_ALL          (PRINT_DEVS_FAILED | \
                                PRINT_DEVS_ASSIGNED | \
                                PRINT_DEVS_UNASSIGNED |\
                                PRINT_DEVS_IGNORED)

/*! Print number of devices, buses and drivers */
extern void drvmgr_summary(void);

/*! Print devices with certain condictions met according to 'options' */
extern void drvmgr_print_devs(unsigned int options);

/*! Print device/bus topology */
extern void drvmgr_print_topo(void);

/*! Print the memory usage
 * Only accounts for data structures. Not for the text size.
 */
extern void drvmgr_print_mem(void);

#define OPTION_DEV_GENINFO   0x00000001
#define OPTION_DEV_BUSINFO   0x00000002
#define OPTION_DEV_DRVINFO   0x00000004
#define OPTION_DRV_DEVS      0x00000100
#define OPTION_BUS_DEVS      0x00010000
#define OPTION_RECURSIVE     0x01000000
#define OPTION_INFO_ALL      0xffffffff

/*! Print information about a driver manager object (device, driver, bus) */
extern void drvmgr_info(void *id, unsigned int options);

/*! Get information about a device */
extern void drvmgr_info_dev(struct drvmgr_dev *dev, unsigned int options);

/*! Get information about a bus */
extern void drvmgr_info_bus(struct drvmgr_bus *bus, unsigned int options);

/*! Get information about a driver */
extern void drvmgr_info_drv(struct drvmgr_drv *drv, unsigned int options);

/*! Get information about all devices on a bus */
extern void drvmgr_info_devs_on_bus(struct drvmgr_bus *bus, unsigned int options);

/*! Get information about all devices in the system (on all buses) */
extern void drvmgr_info_devs(unsigned int options);

/*! Get information about all drivers in the system */
extern void drvmgr_info_drvs(unsigned int options);

/*! Get information about all buses in the system */
extern void drvmgr_info_buses(unsigned int options);

/*! Get Driver by Driver ID */
extern struct drvmgr_drv *drvmgr_drv_by_id(uint64_t id);

/*! Get Driver by Driver Name */
extern struct drvmgr_drv *drvmgr_drv_by_name(const char *name);

/*! Get Device by Device Name */
extern struct drvmgr_dev *drvmgr_dev_by_name(const char *name);

#ifdef __cplusplus
}
#endif

#endif