#ifndef ABCIO_H
#define ABCIO_H

#include <stddef.h>
#include <stdint.h>

#define DEVSEL_NONE 64		/* No device at all selected */

struct abc_dev;

/* Called from an interrupt handler, so hot */
#define ABC_CALLBACK_DECL(func)						\
    void func(struct abc_dev *dev __unused,				\
	      uint8_t data __unused,					\
	      uint8_t addr __unused)

#define ABC_CALLBACK(func)			\
    __hot ABC_CALLBACK_DECL(func)

typedef ABC_CALLBACK_DECL((*abc_callback_t));

struct abc_dev {
    uint8_t *out_buf;
    size_t out_cnt;

    const uint8_t *inp_buf;
    size_t inp_cnt;

    uint16_t callback_mask;
    uint16_t event_mask;	/* Can be a superset of callback_mask */

    uint8_t status_first_out_mask;
    uint8_t status_first_inp_mask;

    uint8_t out_data[6];	/* [1] is devsel, all 8 bits */
    union {
	struct {
	    uint8_t inp_data[2];
	    uint8_t inp_en;
	    uint8_t inp_data_def; /* inp_data[0] when no queue active */
	};
	uint32_t inp_data_w;
    };

    abc_callback_t callback_out[6];
    abc_callback_t callback_inp[2];
    abc_callback_t callback_rst;
};

extern struct abc_dev *_abc_selected_dev;
static inline struct abc_dev *abc_selected_dev(void)
{
    return _abc_selected_dev;
}

void abc_setup_out_queue(struct abc_dev *dev, void *buf, size_t len,
			 uint8_t status);
void abc_setup_inp_queue(struct abc_dev *dev, const void *buf, size_t len,
			 uint8_t status);
void abc_set_inp_default(struct abc_dev *dev, uint8_t val);
void abc_set_inp_status(struct abc_dev *dev, uint8_t val);

/*
 * The _ versions can be used from interrupt handlers or when ABC_IRQ
 * is known to be masked already; for the _inp_data() functions this ALSO
 * requires that dev->inp_cnt is known to be zero (no currently configured
 * queue.)
 *
 * The __ versions can be used when it is *also* known that the device
 * in question is already selected (e.g. inside a callback.)
 */
static inline void _abc_set_inp_data(struct abc_dev *dev, uint8_t val)
{
    dev->inp_data[0] = dev->inp_data_def = val;
    if (dev == abc_selected_dev())
	ABC_INP0_DATA = val;
}
static inline void _abc_set_inp_status(struct abc_dev *dev, uint8_t val)
{
    dev->inp_data[1] = val;
    if (dev == abc_selected_dev())
	ABC_INP1_DATA = val;
}
static inline void __abc_set_inp_data(struct abc_dev *dev, uint8_t val)
{
    ABC_INP0_DATA = dev->inp_data[0] = dev->inp_data_def = val;
}
static inline void __abc_set_inp_status(struct abc_dev *dev, uint8_t val)
{
    ABC_INP1_DATA = dev->inp_data[1] = val;
}

void abc_register(struct abc_dev *dev, unsigned int devsel);
void abc_init(void);

void abcdisk_init(void);
void abcdisk_io_poll(void);

void abc_init_memmap(void);

#endif /* ABCIO_H */