#ifndef UART_PL011_H
#define UART_PL011_H

#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>

typedef volatile struct __attribute__((packed)) {
	uint32_t DR;			/* 0x0 Data Register */
	uint32_t RSRECR;		/* 0x4 Receive status / error clean register */
	uint32_t _reserved0[4];		/* 0x8-0x14 reserved */
	const uint32_t FR;		/* 0x18 Flag register */
	uint32_t _reserved1;		/* 0x1C reserved */
	uint32_t ILPR;			/* 0x20 Low-power counter register */
	uint32_t IBRD;			/* 0x24 Integer baudrate register */
	uint32_t FBRD;			/* 0x28 Fractional baudrate register */
	uint32_t LCRH;			/* 0x2C Line control register */
	uint32_t CR;			/* 0x30 Control register */
} uart_registers;

typedef enum {
	UART_OK = 0,
	UART_INVALID_ARGUMENT_BAUDRATE,
	UART_INVALID_ARGUMENT_WORDSIZE,
	UART_INVALID_ARGUMENT_STOP_BITS,
	UART_RECEIVE_ERROR,
	UART_NO_DATA
} uart_error;

typedef struct {
	uint8_t		data_bits;
	uint8_t		stop_bits;
	bool		parity;
	uint32_t	baudrate;
} uart_config;

#define UART0_INTERRUPT (37u)

#define DR_DATA_MASK	(0xFFu)

#define FR_BUSY		(1 << 3u)
#define	FR_RXFE		(1 << 4u)
#define FR_TXFF		(1 << 5u)

#define	RSRECR_ERR_MASK	(0xFu)

#define LCRH_FEN	(1 << 4u)
#define LCRH_PEN	(1 << 1u)
#define LCRH_EPS	(1 << 2u)
#define LCRH_STP2	(1 << 3u)
#define LCRH_SPS	(1 << 7u)
#define CR_UARTEN	(1 << 0u)

#define LCRH_WLEN_5BITS	(0u << 5u)
#define LCRH_WLEN_6BITS	(1u << 5u)
#define LCRH_WLEN_7BITS (2u << 5u)
#define LCRH_WLEN_8BITS (3u << 5u)

uart_error uart_configure(uart_config* config);
void uart_putchar(char c);
void uart_write(const char* data);
uart_error uart_getchar(char* c);

#endif