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alexbevi
GitHub Repository: alexbevi/BizHawk
 Path: blob/master/genplus-gx/core/cd_hw/cdc.h
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/***************************************************************************************

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 *  Genesis Plus

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 *  CD data controller (LC89510 compatible)

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 *

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 *  Copyright (C) 2012  Eke-Eke (Genesis Plus GX)

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 *

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 *  Redistribution and use of this code or any derivative works are permitted

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 *  provided that the following conditions are met:

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 *

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 *   - Redistributions may not be sold, nor may they be used in a commercial

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 *     product or activity.

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 *

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 *   - Redistributions that are modified from the original source must include the

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 *     complete source code, including the source code for all components used by a

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 *     binary built from the modified sources. However, as a special exception, the

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 *     source code distributed need not include anything that is normally distributed

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 *     (in either source or binary form) with the major components (compiler, kernel,

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 *     and so on) of the operating system on which the executable runs, unless that

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 *     component itself accompanies the executable.

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 *

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 *   - Redistributions must reproduce the above copyright notice, this list of

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 *     conditions and the following disclaimer in the documentation and/or other

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 *     materials provided with the distribution.

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 *

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 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

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 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

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 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

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 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

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 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

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 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

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 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

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 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

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 *  POSSIBILITY OF SUCH DAMAGE.

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 *

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 ****************************************************************************************/

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#ifndef _HW_CDC_

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#define _HW_CDC_

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#define cdc scd.cdc_hw

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/* CDC hardware */

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typedef struct

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{

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  uint8 ifstat;

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  uint8 ifctrl;

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  reg16_t dbc;

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  reg16_t dac;

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  reg16_t pt;

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  reg16_t wa;

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  uint8 ctrl[2];

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  uint8 head[2][4];

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  uint8 stat[4];

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  int cycles;

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  void (*dma_w)(unsigned int words);  /* DMA transfer callback */

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  uint8 ram[0x4000 + 2352]; /* 16K external RAM (with one block overhead to handle buffer overrun) */

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} cdc_t; 

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/* Function prototypes */

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extern void cdc_init(void);

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extern void cdc_reset(void);

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extern int cdc_context_save(uint8 *state);

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extern int cdc_context_load(uint8 *state);

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extern void cdc_dma_update(void);

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extern int cdc_decoder_update(uint32 header);

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extern void cdc_reg_w(unsigned char data);

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extern unsigned char cdc_reg_r(void);

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extern unsigned short cdc_host_r(void);

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#endif

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