mipsidt_serial.h

来自「eCos操作系统源码」· C头文件 代码 · 共 220 行

//==========================================================================
//
//      io/serial/mips/idt79s334a/mipsidt_serial.h
//
//      MIPS IDT79S334A Serial I/O definitions.
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
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// or inline functions from this file, or you compile this file and link it
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//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    tmichals based on driver by dmoseley, based on POWERPC driver by jskov
// Contributors: gthomas, jskov, dmoseley, tmichals
// Date:         2003-02-13
// Date:         2003-02-13
// Purpose:      MIPS IDT79s334a reference platform serial device driver definitions.
// Description:  IDT MIPS serial device driver definitions.
//####DESCRIPTIONEND####
//==========================================================================

// Description of serial ports on IDT 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 IDTMIPS_SER_16550_BASE_A    0xB8000803
#define IDTMIPS_SER_16550_BASE_B    0xB8000823
#define SER_16550_BASE              IDTMIPS_SER_16550_BASE_A
#define INTR_COM0_REG               0xB8000554
#define INTR_COM1_REG               0xB8000564

//-----------------------------------------------------------------------------
// Define the serial registers. The IDT 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 0x04   // interrupt enable register, read/write, dlab = 0
#define SER_16550_DLM 0x04   // divisor latch (MS), read/write, dlab = 1
#define SER_16550_IIR 0x08   // interrupt identification reg, read, dlab = 0
#define SER_16550_FCR 0x08   // fifo control register, write, dlab = 0
#define SER_16550_AFR 0x08   // alternate function reg, read/write, dlab = 1
#define SER_16550_LCR 0x0c   // line control register, read/write
#define SER_16550_MCR 0x10   // modem control register, read/write
#define SER_16550_LSR 0x14   // line status register, read
#define SER_16550_MSR 0x18   // modem status register, read
#define SER_16550_SCR 0x1c   // 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
};


static unsigned int select_baud[] = {
    0,        // Unused
    50,       // 50
    75,       // 75
    110,      // 110
    134,      // 134.5
    150,      // 150
    200,      // 200
    300,      // 300
    600,      // 600
    1200,     // 1200
    1800,     // 1800
    2400,     // 2400
    3600,     // 3600
    4800,     // 4800
    7200,     // 7200
    9600,     // 9600
    14400,    // 14400
    19200,    // 19200
    38400,    // 38400
    57600,    // 57600
    115200,   // 115200
    230400,   // 230400
};

// EOF mipsidt_serial.h