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//==========================================================================

//

//      io/serial/mips/atlas/atlas_serial.h

//

//      MIPS Atlas Serial I/O definitions.

//

//==========================================================================

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//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   dmoseley, based on PowerPC driver by jskov

// Contributors:gthomas, jskov, dmoseley

// Date:        2000-06-23

// Purpose:     Atlas Serial definitions

//####DESCRIPTIONEND####

//==========================================================================

// Description of serial ports on Atlas board

// Interrupt Enable Register

#define IER_RCV 0x01

#define IER_XMT 0x02

#define IER_LS  0x04

#define IER_MS  0x08

// Line Control Register

#define LCR_WL5 0x00    // Word length

#define LCR_WL6 0x01

#define LCR_WL7 0x02

#define LCR_WL8 0x03

#define LCR_SB1 0x00    // Number of stop bits

#define LCR_SB1_5 0x04  // 1.5 -> only valid with 5 bit words

#define LCR_SB2 0x04

#define LCR_PN  0x00    // Parity mode - none

#define LCR_PE  0x0C    // Parity mode - even

#define LCR_PO  0x08    // Parity mode - odd

#define LCR_PM  0x28    // Forced "mark" parity

#define LCR_PS  0x38    // Forced "space" parity

#define LCR_DL  0x80    // Enable baud rate latch

// Line Status Register

#define LSR_RSR 0x01

#define LSR_THE 0x20

// Modem Control Register

#define MCR_DTR 0x01

#define MCR_RTS 0x02

#define MCR_INT 0x08   // Enable interrupts

// Interrupt status register

#define ISR_None             0x01

#define ISR_Rx_Line_Status   0x06

#define ISR_Rx_Avail         0x04

#define ISR_Rx_Char_Timeout  0x0C

#define ISR_Tx_Empty         0x02

#define IRS_Modem_Status     0x00

// FIFO control register

#define FCR_ENABLE     0x01

#define FCR_CLEAR_RCVR 0x02

#define FCR_CLEAR_XMIT 0x04

////////////////////////////////////////////////////////////

// Clean this up.

#define ATLAS_SER_16550_BASE_A    0xBF000900

#define SER_16550_BASE            ATLAS_SER_16550_BASE_A

//-----------------------------------------------------------------------------

// Define the serial registers. The Atlas board is equipped with a 16550C

// serial chip.

#define SER_16550_RBR 0x00   // receiver buffer register, read, dlab = 0

#define SER_16550_THR 0x00   // transmitter holding register, write, dlab = 0

#define SER_16550_DLL 0x00   // divisor latch (LS), read/write, dlab = 1

#define SER_16550_IER 0x08   // interrupt enable register, read/write, dlab = 0

#define SER_16550_DLM 0x08   // divisor latch (MS), read/write, dlab = 1

#define SER_16550_IIR 0x10   // interrupt identification reg, read, dlab = 0

#define SER_16550_FCR 0x10   // fifo control register, write, dlab = 0

#define SER_16550_AFR 0x10   // alternate function reg, read/write, dlab = 1

#define SER_16550_LCR 0x18   // line control register, read/write

#define SER_16550_MCR 0x20   // modem control register, read/write

#define SER_16550_LSR 0x28   // line status register, read

#define SER_16550_MSR 0x30   // modem status register, read

#define SER_16550_SCR 0x38   // scratch pad register

// The interrupt enable register bits.

#define SIO_IER_ERDAI   0x01            // enable received data available irq

#define SIO_IER_ETHREI  0x02            // enable THR empty interrupt

#define SIO_IER_ELSI    0x04            // enable receiver line status irq

#define SIO_IER_EMSI    0x08            // enable modem status interrupt

// The interrupt identification register bits.

#define SIO_IIR_IP      0x01            // 0 if interrupt pending

#define SIO_IIR_ID_MASK 0x0e            // mask for interrupt ID bits

// The line status register bits.

#define SIO_LSR_DR      0x01            // data ready

#define SIO_LSR_OE      0x02            // overrun error

#define SIO_LSR_PE      0x04            // parity error

#define SIO_LSR_FE      0x08            // framing error

#define SIO_LSR_BI      0x10            // break interrupt

#define SIO_LSR_THRE    0x20            // transmitter holding register empty

#define SIO_LSR_TEMT    0x40            // transmitter register empty

#define SIO_LSR_ERR     0x80            // any error condition

// The modem status register bits.

#define SIO_MSR_DCTS  0x01              // delta clear to send

#define SIO_MSR_DDSR  0x02              // delta data set ready

#define SIO_MSR_TERI  0x04              // trailing edge ring indicator

#define SIO_MSR_DDCD  0x08              // delta data carrier detect

#define SIO_MSR_CTS   0x10              // clear to send

#define SIO_MSR_DSR   0x20              // data set ready

#define SIO_MSR_RI    0x40              // ring indicator

#define SIO_MSR_DCD   0x80              // data carrier detect

// The line control register bits.

#define SIO_LCR_WLS0   0x01             // word length select bit 0

#define SIO_LCR_WLS1   0x02             // word length select bit 1

#define SIO_LCR_STB    0x04             // number of stop bits

#define SIO_LCR_PEN    0x08             // parity enable

#define SIO_LCR_EPS    0x10             // even parity select

#define SIO_LCR_SP     0x20             // stick parity

#define SIO_LCR_SB     0x40             // set break

#define SIO_LCR_DLAB   0x80             // divisor latch access bit

// The FIFO control register

#define SIO_FCR_FCR0   0x01             // enable xmit and rcvr fifos

#define SIO_FCR_FCR1   0x02             // clear RCVR FIFO

#define SIO_FCR_FCR2   0x04             // clear XMIT FIFO

/////////////////////////////////////////

static unsigned char select_word_length[] = {

    LCR_WL5,    // 5 bits / word (char)

    LCR_WL6,

    LCR_WL7,

    LCR_WL8

};

static unsigned char select_stop_bits[] = {

    0,

    LCR_SB1,    // 1 stop bit

    LCR_SB1_5,  // 1.5 stop bit

    LCR_SB2     // 2 stop bits

};

static unsigned char select_parity[] = {

    LCR_PN,     // No parity

    LCR_PE,     // Even parity

    LCR_PO,     // Odd parity

    LCR_PM,     // Mark parity

    LCR_PS,     // Space parity

};

// FIXME: calc all properly

// The Atlas board has a 3.6864 MHz crystal

static unsigned short select_baud[] = {

    0,    // Unused

    0,    // 50

    0,    // 75

    2094, // 110

    0,    // 134.5

    1536, // 150

    0,    // 200

    768,  // 300

    384,  // 600

    192,  // 1200

    0,    // 1800

    96,   // 2400

    0,    // 3600

    48,   // 4800

    32,   // 7200

    24,   // 9600

    16,   // 14400

    12,   // 19200

    6,    // 38400

    4,    // 57600

    2,    // 115200

    1,    // 230400

};