/*
* Copyright (c) 2018 naehrwert
* Copyright (c) 2019-2020 CTCaer
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef _UART_H_
#define _UART_H_

#include <utils/types.h>

#define UART_A 0
#define UART_B 1
#define UART_C 2
#define UART_D 3
#define UART_E 4

#define BAUD_115200 115200

#define UART_TX_IDLE 0x1
#define UART_RX_IDLE 0x2

#define UART_TX_FIFO_FULL 0x100
#define UART_RX_FIFO_EMPTY 0x200

#define UART_INVERT_RXD 0x01
#define UART_INVERT_TXD 0x02
#define UART_INVERT_CTS 0x04
#define UART_INVERT_RTS 0x08

#define UART_IER_DLAB_IE_EORD 0x20

#define UART_LCR_DLAB 0x80
#define UART_LCR_STOP 0x4
#define UART_LCR_WORD_LENGTH_8 0x3

#define UART_LSR_RDR 0x1
#define UART_LSR_THRE 0x20
#define UART_LSR_TMTY 0x40
#define UART_LSR_FIFOE 0x80

#define UART_IIR_FCR_TX_CLR 0x4
#define UART_IIR_FCR_RX_CLR 0x2
#define UART_IIR_FCR_EN_FIFO 0x1

#define UART_IIR_NO_INT BIT(0)
#define UART_IIR_INT_MASK 0xF
/* Custom returned interrupt results. Actual interrupts are -1 */
#define UART_IIR_NOI   0 // No interrupt.
#define UART_IIR_MSI   1 // Modem status interrupt.
#define UART_IIR_THRI  2 // Transmitter holding register empty.
#define UART_IIR_RDI   3 // Receiver data interrupt.
#define UART_IIR_ERROR 4 // Overrun Error, Parity Error, Framing Error, Break.
#define UART_IIR_REDI  5 // Receiver end of data interrupt.
#define UART_IIR_RDTI  7 // Receiver data timeout interrupt.

#define UART_MCR_RTS 0x2
#define UART_MCR_DTR 0x1

typedef struct _uart_t
{
	/* 0x00 */ vu32 UART_THR_DLAB;
	/* 0x04 */ vu32 UART_IER_DLAB;
	/* 0x08 */ vu32 UART_IIR_FCR;
	/* 0x0C */ vu32 UART_LCR;
	/* 0x10 */ vu32 UART_MCR;
	/* 0x14 */ vu32 UART_LSR;
	/* 0x18 */ vu32 UART_MSR;
	/* 0x1C */ vu32 UART_SPR;
	/* 0x20 */ vu32 UART_IRDA_CSR;
	/* 0x24 */ vu32 UART_RX_FIFO_CFG;
	/* 0x28 */ vu32 UART_MIE;
	/* 0x2C */ vu32 UART_VENDOR_STATUS;
	/* 0x30 */ u8 _pad_30[0xC];
	/* 0x3C */ vu32 UART_ASR;
} uart_t;

void uart_init(u32 idx, u32 baud);
void uart_wait_idle(u32 idx, u32 which);
void uart_send(u32 idx, const u8 *buf, u32 len);
u32  uart_recv(u32 idx, u8 *buf, u32 len);
void uart_invert(u32 idx, bool enable, u32 invert_mask);
u32  uart_get_IIR(u32 idx);
void uart_set_IIR(u32 idx);
void uart_empty_fifo(u32 idx, u32 which);

#endif