/*
 * Copyright 2009, Haiku, Inc.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              François Revol <revol@free.fr>
 */
#ifndef _UART_H_
#define _UART_H_

// References:
// http://www.beyondlogic.org/serial/serial.htm


// 8250 UART registers
#define THB             0
#define RBR             0
#define DLLB    0
#define IER             1
#define DLHB    1
#define IIR             2
#define FCR             2
#define LCR             3
#define MCR             4
#define LSR             5
#define MSR             6
#define SR              7

// bits
#define IER_RDA                 (1 << 0)
#define IER_THRE                (1 << 1)
#define IER_RLS                 (1 << 2)
#define IER_MS                  (1 << 3)
#define IER_SM                  (1 << 4)        // 16750
#define IER_LPM                 (1 << 5)        // 16750

#define IIR_PENDING             (1 << 0)
#define IIR_IMASK               (0x03 << 1)
#define IIR_MS                  (0 << 1)
#define IIR_THRE                (1 << 1)
#define IIR_RDA                 (2 << 1)
#define IIR_RLS                 (3 << 1)
#define IIR_TO                  (1 << 3)        // 16550
#define IIR_F64EN               (1 << 5)        // 16750
#define IIR_FMASK               (3 << 6)

#define FCR_ENABLE              (1 << 0)
#define FCR_RX_RST              (1 << 1)
#define FCR_TX_RST              (1 << 2)
#define FCR_DMA_EN              (1 << 3)
#define FCR_F64EN               (1 << 5)
#define FCR_FMASK               (0x03 << 6)
#define FCR_F_1                 (0 << 6)
#define FCR_F_4                 (1 << 6)
#define FCR_F_8                 (2 << 6)
#define FCR_F_14                (3 << 6)

#define LCR_5BIT                0
#define LCR_6BIT                1
#define LCR_7BIT                2
#define LCR_8BIT                3
#define LCR_2STOP               (1 << 2)
#define LCR_P_EN                (1 << 3)
#define LCR_P_EVEN              (1 << 4)
#define LCR_P_MARK              (1 << 5)
#define LCR_BREAK               (1 << 6)
#define LCR_DLAB                (1 << 7)

#define MCR_DTR                 (1 << 0)
#define MCR_RTS                 (1 << 1)
#define MCR_AUX1                (1 << 2)
#define MCR_AUX2                (1 << 3)
#define MCR_IRQ_EN              (1 << 3)        // ?
#define MCR_LOOP                (1 << 4)
#define MCR_AUTOFLOW    (1 << 5)        // 16750

#define LSR_DR                  (1 << 0)
#define LSR_OVERRUN             (1 << 1)
#define LSR_PARITY              (1 << 2)
#define LSR_FRAMING             (1 << 3)
#define LSR_BREAK               (1 << 4)
#define LSR_THRE                (1 << 5)
#define LSR_TSRE                (1 << 6)
#define LSR_FIFO                (1 << 7)

#define MSR_DCTS                (1 << 0)
#define MSR_DDSR                (1 << 1)
#define MSR_TERI                (1 << 2)
#define MSR_DDCD                (1 << 3)
#define MSR_CTS                 (1 << 4)
#define MSR_DSR                 (1 << 5)
#define MSR_RI                  (1 << 6)
#define MSR_DCD                 (1 << 7)

// speeds
//#define BPS_50                


#endif  // _UART_H_