uarthw_dsk5402.c
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上传日期:2008-01-29
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文件大小:9k
- /*
- * Copyright 2003 by Texas Instruments Incorporated.
- * All rights reserved. Property of Texas Instruments Incorporated.
- * Restricted rights to use, duplicate or disclose this code are
- * granted through contract.
- *
- */
- /* "@(#) DDK 1.10.00.23 07-02-03 (ddk-b12)" */
- /*
- * ======== uarthw_dsk5402.c ========
- */
-
- #define CHIP_5402 1
- #include <std.h>
- #include <hwi.h>
- #include <iom.h>
- #include <csl.h>
- #include <csl_irq.h>
- #include <uarthw.h>
- #include <uarthw_dsk5402.h>
- /* uart register definitions */
- #define RBRREG port4000
- #define THRREG port4000
- #define DLLREG port4000
- #define DLMREG port4001
- #define IERREG port4001
- #define IIRREG port4002
- #define FCRREG port4002
- #define LCRREG port4003
- #define MCRREG port4004
- #define LSRREG port4005
- #define MSRREG port4006
- #define SCRREG port4007
- #define getLineStatus() (LSRREG & 0xff)
- #define getModemControlReg() (MCRREG & 0xff)
- #define setModemControlReg(c) MCRREG =(c)
- #define getLineControlReg() (LCRREG & 0xff)
- #define setLineControlReg(c) LCRREG =(c)
- #define disableRx() (IERREG = IERREG & 0xFe)
- #define disableTx() (IERREG = IERREG & 0xFd)
- #define enableRx() (IERREG = IERREG | 0x01)
- #define enableTx() (IERREG = IERREG | 0x02)
- #define getInt() (IIRREG & 0xf)
- #define NOINTPENDING 0x01
- #define IDENTIFYINT(id) ((id>>1)&0x03)
- #define MCRDTRMASK 0xFE
- #define MCRRTSMASK 0xFD
- #define LCRBRKMASK 0xBF
- #define AFERTSCTSMASK 0xDD
- #define AFERTSCTSFLW 0x22
- #define AFECTSFLW 0x20
- #define AFEDISFLW 0x00
- #define LCRBREAKPOS 6
- #define MCRRTSPOS 1
- #define UARTINTERRUPT IRQ_EVT_INT1
- #define UARTHW_DSK5402_INTR_MASK_DEFAULT 1
- /* uart register addresses */
- extern volatile ioport unsigned int port4000;
- extern volatile ioport unsigned int port4001;
- extern volatile ioport unsigned int port4002;
- extern volatile ioport unsigned int port4003;
- extern volatile ioport unsigned int port4004;
- extern volatile ioport unsigned int port4005;
- extern volatile ioport unsigned int port4006;
- extern volatile ioport unsigned int port4007;
- static void setupFlowParams(Uns flowParam);
- static void uartIsr(Ptr cbArg);
- static Int uartRxFull();
- static UARTHW_DSK5402_Params defaultParams = {
- UARTHW_DSK5402_FLOW_AFE_RTSCTS,
- UARTHW_DSK5402_DISABLE_PARITY,
- UARTHW_DSK5402_WORD8,
- UARTHW_DSK5402_STOP1,
- UARTHW_DSK5402_BAUD_115200,
- UARTHW_DSK5402_INTR_MASK_DEFAULT
- };
- static UARTHW_Tcallback *callbacks;
- /*
- * ======== UARTHW_open ========
- *
- * This function is used to attach to the UART 16550.
- * Typically this function plugs the UART interrupt vector with
- * the internal driver supplied isr routine.
- * Initializes the UART, UART flow parameters and UART communication parameters
- *
- */
- UARTHW_Handle UARTHW_open(Int uartId, Ptr params, Ptr cbArg, UARTHW_Tcallback *cbFxns)
- {
- HWI_Attrs hwattr;
- volatile Char c;
- UARTHW_DSK5402_Params *uartParams = (UARTHW_DSK5402_Params *)params;
- if (uartId > 0) {
- return (NULL); /* only supports one UART */
- }
- /*
- * Initialize the isrhandler to the one given by
- * generic uart.
- */
- callbacks = cbFxns;
-
- hwattr.intrMask = uartParams->intrMask;
- hwattr.arg = (Arg)cbArg;
-
- HWI_dispatchPlug(UARTINTERRUPT, (Fxn)uartIsr, &hwattr);
- /*
- * Use the default attributes if one is not given
- */
- if (uartParams == NULL) {
- uartParams = &defaultParams;
- }
-
- /*
- * Setup the baud and other communication parameters
- */
- LCRREG = 0x80;
- DLLREG = uartParams->baud;
- DLMREG = uartParams->baud >> 8;
- /* deselect divisor latch register */
- LCRREG = uartParams->wordSize | (uartParams->stopBits << 2) |
- (uartParams->parity << 3);
- /*
- * Initialize the rest of the UART
- */
-
- FCRREG = 0x87; /* FIFO control register */
- IERREG = 0xff; /* enable all interrupts */
- LSRREG = 0x00; /* to clear the previous line status */
- MSRREG = 0x00; /* modem status register */
- MCRREG = 0x00;
-
- /* read the UART receive buffer to clear it */
- while (uartRxFull()) {
- c = (RBRREG & 0xFF);
- }
-
- setupFlowParams((uartParams->flowControl) & UARTHW_DSK5402_HW_FLOW_MASK);
-
- enableRx();
- enableTx();
-
- IRQ_enable(UARTINTERRUPT);
-
- return ((UARTHW_Handle)1); /* non-zero means success */
- }
- /*
- * ======== UARTHW_getModemStatus ========
- *
- * This function is used to get the modem status for the UART 16550
- */
-
- Int UARTHW_getModemStatus(UARTHW_Handle hUart, char *pmodemStatus)
- {
- *pmodemStatus = (char)(MSRREG & 0xff);
-
- return (IOM_COMPLETED);
- }
- /*
- * ======== UARTHW_resetDevice ========
- *
- * This function is used to reset the UART 16550.
- * Ideally this function should clear the transmit and
- * receive fifos if the fifos are being used.
- */
- void UARTHW_resetDevice(UARTHW_Handle hUart)
- {
- FCRREG |= 0x06;
- }
- /*
- * ======== UARTHW_setBreak ========
- *
- * This function is used to set the break on/off for the UART 16550
- */
- Int UARTHW_setBreak(UARTHW_Handle hUart, Int bBreak)
- {
- char lcrVal;
- lcrVal = getLineControlReg();
- lcrVal = (lcrVal& LCRBRKMASK)|(bBreak<<LCRBREAKPOS);
- setLineControlReg(lcrVal);
-
- return (IOM_COMPLETED);
- }
- /*
- * ======== UARTHW_setDTR ========
- *
- * This function is used to set the DTR signal for the UART 16550
- */
- Int UARTHW_setDTR(UARTHW_Handle hUart, int dtrval)
- {
- char mcrVal;
-
- mcrVal = getModemControlReg();
- mcrVal = (mcrVal& MCRDTRMASK)|dtrval;
- setModemControlReg(mcrVal);
- return (IOM_COMPLETED);
- }
- /*
- * ======== UARTHW_setRTS ========
- *
- * This function is used to set the RTS signal for the UART 16550
- */
- Int UARTHW_setRTS(UARTHW_Handle hUart, int rtsval)
- {
- char mcrVal;
- mcrVal = getModemControlReg();
- mcrVal = (mcrVal& MCRRTSMASK)|(rtsval<<MCRRTSPOS);
- setModemControlReg(mcrVal);
-
- return (IOM_COMPLETED);
- }
- /*
- * ======== UARTHW_txEmpty ========
- *
- * This function is used to get the transmit buffer empty condition
- */
- Int UARTHW_txEmpty(UARTHW_Handle hUart)
- {
- return (LSRREG & 0x20);
- }
- /*
- * ======== UARTHW_writeChar ========
- *
- * This function is used to write a character to the transmit register
- */
- void UARTHW_writeChar(UARTHW_Handle hUart, char c)
- {
- THRREG = c;
- }
- /*
- * ======== UARTHW_enableRx ========
- *
- * This function is used to enable the Rx interrupt Handler
- */
- void UARTHW_enableRx(UARTHW_Handle hUart)
- {
- enableRx();
- }
- /*
- * ======== UARTHW_disableRx ========
- *
- * This function is used to disable the Rx interrupt Handler
- */
- void UARTHW_disableRx(UARTHW_Handle hUart)
- {
- disableRx();
- }
- /*
- * ======== setupFlowParams ========
- *
- * This function is used to setup the UART 16550 flow paramaters
- */
- static void setupFlowParams(Uns flowParam)
- {
- char mcrVal;
-
- mcrVal = getModemControlReg();
-
- if (flowParam & UARTHW_DSK5402_FLOW_AFE_RTSCTS) {
- mcrVal=(mcrVal & AFERTSCTSMASK)|AFERTSCTSFLW;
- }
- else if (flowParam & UARTHW_DSK5402_FLOW_AFE_CTS) {
- mcrVal=(mcrVal & AFERTSCTSMASK)|AFECTSFLW;
- }
- else {
- mcrVal=(mcrVal & AFERTSCTSMASK)|AFEDISFLW;
- }
- setModemControlReg(mcrVal);
- }
- /*
- * ======== uartIsr ========
- *
- * This is the interrupt service handler used by the DSK 5402
- * UART driver.
- */
- static void uartIsr(Ptr cbArg)
- {
- Int id;
- Int argval;
-
- /*
- * While loop here since 16550 holds interrupt line high until
- * all interrupt conditions are handled (2 or more may be pending
- * at same time). 'C54x uses edge-triggered interrupts and would
- * miss interrupts otherwise.
- */
- while ((id = getInt()) != NOINTPENDING) {
- id = IDENTIFYINT(id);
-
- if (id == UARTHW_RXFULL_STATUSHANDLER) {
- if (uartRxFull()) {
- argval=(RBRREG & 0xff);
- (*callbacks[id])(cbArg, argval);
- }
- }
- else if (id == UARTHW_TXEMPTY_STATUSHANDLER) {
- (*callbacks[id])(cbArg, 0);
- }
- else if (id == UARTHW_LINE_STATUSHANDLER) {
- argval = (LSRREG & 0xff);
-
- while ((argval & 0x0E) && (argval & 0x01)) {
- (RBRREG & 0xff);
- argval = (LSRREG & 0xff);
- }
- (*callbacks[id])(cbArg, argval);
- }
- else if (id == UARTHW_MODEM_STATUSHANDLER) {
- argval = (MSRREG & 0xff);
- (*callbacks[id])(cbArg, argval);
- }
- }
- }
- /*
- * ======== uartRxFull ========
- *
- * This function is used to get the Receive Buffer Full condition
- */
- static Int uartRxFull()
- {
- return (LSRREG & 0x01);
- }