dma.h

Go to the documentation of this file.

enum dma_mode_bit_t {
        DMA_MODE_DEMAND = 0x00,
        DMA_MODE_SINGLE = 0x40,
        DMA_MODE_BLOCK = 0x80,
        DMA_MODE_CASCADE = 0xC0,

        DMA_MODE_ADDR_DEC = 0x20, 
        DMA_MODE_AUTO_INIT = 0x10,

        DMA_MODE_TX_VERYFY = 0x00,
        DMA_MODE_TX_WRITE = 0x04, 
        DMA_MODE_TX_READ = 0x08, 
        DMA_MODE_TX_ILLEGAL = 0x0C,
};

enum dma_channel_t {
        DMA_CH0 = 0x00,
        DMA_CH1 = 0x01,
        DMA_CH2 = 0x02,
        DMA_CH3 = 0x03,

        DMA_8BIT = 0x00,
        DMA_16BIT = 0x01,

        DMA_MAX_TYPE = 0x02,
        DMA_MAX_CHANNEL = 0x08,
};

enum dma_mask_bit_t {
        /* Set/Clear mask bit 2 */
        DMA_MASK_DISABLE_CH = 0x04, 
};

struct dma_port_entry_t {
        unsigned char page;
        unsigned char address;
        unsigned char count;
};

struct dma_ctrl_port_entry_t {
        unsigned char status;
        unsigned char command;
        unsigned char request;
        unsigned char single_mask;
        unsigned char write_mode;
        unsigned char byte_ptr;
        unsigned char intermediate;
        unsigned char dma_mask;
};

extern void dma_init(int ch, int mode, unsigned long address, int count);

extern int dma_is_done(int ch);

extern struct dma_ctrl_port_entry_t *dma_get_ctrl_port(int type);

extern struct dma_port_entry_t *dma_get_port(int channel);