mirror of
https://github.com/libretro/Genesis-Plus-GX.git
synced 2024-11-24 00:39:45 +00:00
72 lines
2.9 KiB
C
72 lines
2.9 KiB
C
/***************************************************************************************
|
|
* Genesis Plus
|
|
* CD data controller (LC8951x compatible)
|
|
*
|
|
* Copyright (C) 2012-2019 Eke-Eke (Genesis Plus GX)
|
|
*
|
|
* Redistribution and use of this code or any derivative works are permitted
|
|
* provided that the following conditions are met:
|
|
*
|
|
* - Redistributions may not be sold, nor may they be used in a commercial
|
|
* product or activity.
|
|
*
|
|
* - Redistributions that are modified from the original source must include the
|
|
* complete source code, including the source code for all components used by a
|
|
* binary built from the modified sources. However, as a special exception, the
|
|
* source code distributed need not include anything that is normally distributed
|
|
* (in either source or binary form) with the major components (compiler, kernel,
|
|
* and so on) of the operating system on which the executable runs, unless that
|
|
* component itself accompanies the executable.
|
|
*
|
|
* - Redistributions 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
|
|
*
|
|
****************************************************************************************/
|
|
#ifndef _HW_CDC_
|
|
#define _HW_CDC_
|
|
|
|
#define cdc scd.cdc_hw
|
|
|
|
/* CDC hardware */
|
|
typedef struct
|
|
{
|
|
uint8 ifstat;
|
|
uint8 ifctrl;
|
|
reg16_t dbc;
|
|
reg16_t dac;
|
|
reg16_t pt;
|
|
reg16_t wa;
|
|
uint8 ctrl[2];
|
|
uint8 head[2][4];
|
|
uint8 stat[4];
|
|
int cycles;
|
|
void (*dma_w)(unsigned int words); /* DMA transfer callback */
|
|
uint8 ram[0x4000 + 2352]; /* 16K external RAM (with one block overhead to handle buffer overrun) */
|
|
} cdc_t;
|
|
|
|
/* Function prototypes */
|
|
extern void cdc_init(void);
|
|
extern void cdc_reset(void);
|
|
extern int cdc_context_save(uint8 *state);
|
|
extern int cdc_context_load(uint8 *state);
|
|
extern void cdc_dma_update(void);
|
|
extern void cdc_decoder_update(uint32 header);
|
|
extern void cdc_reg_w(unsigned char data);
|
|
extern unsigned char cdc_reg_r(void);
|
|
extern unsigned short cdc_host_r(void);
|
|
|
|
#endif
|