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ctresource.h

/**
 * Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
 *
 * This source file is released under GPL v2 license (no other versions).
 * See the COPYING file included in the main directory of this source
 * distribution for the license terms and conditions.
 *
 * @File    ctresource.h
 *
 * @Brief
 * This file contains the definition of generic hardware resources for
 * resource management.
 *
 * @Author  Liu Chun
 * @Date    May 13 2008
 *
 */

#ifndef CTRESOURCE_H
#define CTRESOURCE_H

#include <linux/types.h>

enum RSCTYP {
      SRC,
      SRCIMP,
      AMIXER,
      SUM,
      DAIO,
      NUM_RSCTYP  /* This must be the last one and less than 16 */
};

struct rsc_ops;

struct rsc {
      u32 idx:12; /* The index of a resource */
      u32 type:4; /* The type (RSCTYP) of a resource */
      u32 conj:12;      /* Current conjugate index */
      u32 msr:4;  /* The Master Sample Rate a resource working on */
      void *ctrl_blk;   /* Chip specific control info block for a resource */
      void *hw;   /* Chip specific object for hardware access means */
      struct rsc_ops *ops;    /* Generic resource operations */
};

struct rsc_ops {
      int (*master)(struct rsc *rsc);     /* Move to master resource */
      int (*next_conj)(struct rsc *rsc); /* Move to next conjugate resource */
      int (*index)(const struct rsc *rsc); /* Return the index of resource */
      /* Return the output slot number */
      int (*output_slot)(const struct rsc *rsc);
};

int rsc_init(struct rsc *rsc, u32 idx, enum RSCTYP type, u32 msr, void *hw);
int rsc_uninit(struct rsc *rsc);

struct rsc_mgr {
      enum RSCTYP type; /* The type (RSCTYP) of resource to manage */
      unsigned int amount; /* The total amount of a kind of resource */
      unsigned int avail; /* The amount of currently available resources */
      unsigned char *rscs; /* The bit-map for resource allocation */
      void *ctrl_blk; /* Chip specific control info block */
      void *hw; /* Chip specific object for hardware access */
};

/* Resource management is based on bit-map mechanism */
int rsc_mgr_init(struct rsc_mgr *mgr, enum RSCTYP type,
             unsigned int amount, void *hw);
int rsc_mgr_uninit(struct rsc_mgr *mgr);
int mgr_get_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int *ridx);
int mgr_put_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int idx);

#endif /* CTRESOURCE_H */

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