uarthw_c55xx_mcbsp.c
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上传日期:2008-01-29
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文件大小:13k
- /*
- * 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_c55xx_mcbsp.c ========
- */
-
- #include <std.h>
- #include <hwi.h>
- #include <iom.h>
- #include <csl_mcbsp.h>
- #include <csl_irq.h>
- #include <csl_dma.h>
- #include <uarthw_mcbsp.h>
- static Int setupDma(MdUns *rxBuf, MdUns *txBuf, UARTHW_MCBSP_Params *params);
- static Int setupMcbsp(UARTHW_MCBSP_Params *params);
- static void enable(MdUns *txBuf);
- static void rxIsr(void);
- static void txIsr(void);
- static MCBSP_Handle hMcbsp;
- static DMA_Handle hDmaRx;
- static DMA_Handle hDmaTx;
- UARTHW_MCBSP_Params defaultParams = {
- MCBSP_PORT0, /* mcbspId */
- DMA_CHA4, /* dmaRxId */
- DMA_CHA5, /* dmaTxId */
- 200000000, /* mcbspClkIn (200MHz)*/
- 115200, /* baud rate */
- {
- {
- UARTHW_MCBSP_IER_MASK_DEFAULT,
- UARTHW_MCBSP_IER_MASK_DEFAULT
- },
- {
- UARTHW_MCBSP_IER_MASK_DEFAULT,
- UARTHW_MCBSP_IER_MASK_DEFAULT
- }
- }
- };
- /*
- * ======== UARTHW_MCBSP_start ========
- */
- Int UARTHW_MCBSP_start(MdUns *rxBuf, MdUns *txBuf,
- UARTHW_MCBSP_Params *params)
- {
- Int status;
- Int rxId, txId;
- HWI_Attrs hwiAttrs;
- if (params == NULL) {
- params = &defaultParams;
- }
- status = setupMcbsp(params);
- if (status < 0) {
- return (status);
- }
- status = setupDma(rxBuf, txBuf, params);
- if (status < 0) {
- return (status);
- }
- /* Obtain Interrupt IDs for Tx and Rx DMAs */
- rxId = DMA_getEventId(hDmaRx);
- txId = DMA_getEventId(hDmaTx);
- /* plug in the ISR */
- hwiAttrs.ier0mask = params->intrMask.rxIerMask[0];
- hwiAttrs.ier1mask = params->intrMask.rxIerMask[1];
- hwiAttrs.arg = NULL;
- HWI_dispatchPlug(rxId, (Fxn)rxIsr, &hwiAttrs);
- hwiAttrs.ier0mask = params->intrMask.txIerMask[0];
- hwiAttrs.ier1mask = params->intrMask.txIerMask[1];
- HWI_dispatchPlug(txId, (Fxn)txIsr, &hwiAttrs);
- IRQ_enable(rxId);
- IRQ_enable(txId);
- enable(txBuf);
- return (IOM_COMPLETED);
- }
- /*
- * ======== setupDma =======
- */
- static Int setupDma(MdUns *rxBuf, MdUns *txBuf, UARTHW_MCBSP_Params *params)
- {
- Uns dmaTxSynEvt, dmaRxSynEvt;
- Uint32 dmaTxDest, dmaRxSrc;
- LgUns tempAdd;
-
- DMA_Config dmaTxCfg; /* Tx Config Structure */
- DMA_Config dmaRxCfg; /* Rx Config Structure */
-
- DMA_FSET(DMAGCR,FREE,0);
- hDmaRx = DMA_open(params->dmaRxId,DMA_OPEN_RESET);
- hDmaTx = DMA_open(params->dmaTxId,DMA_OPEN_RESET);
-
- //Initialize structures
- DMA_getConfig(hDmaRx, &dmaRxCfg);
- DMA_getConfig(hDmaTx, &dmaTxCfg);
-
- //Tx Side DMA specific configuration
- dmaTxCfg.dmacsdp =
- DMA_FMK(DMACSDP,DST,DMA_DMACSDP_DST_PERIPH) |
- DMA_FMK(DMACSDP,SRC,DMA_DMACSDP_SRC_DARAM) |
- DMA_FMK(DMACSDP,DATATYPE,DMA_DMACSDP_DATATYPE_16BIT) ;
-
- dmaTxCfg.dmaccr =
- DMA_FMK(DMACCR,DSTAMODE,DMA_DMACCR_DSTAMODE_CONST) |
- DMA_FMK(DMACCR,SRCAMODE,DMA_DMACCR_SRCAMODE_POSTINC) |
- DMA_FMK(DMACCR,ENDPROG,DMA_DMACCR_ENDPROG_OFF) |
- DMA_FMK(DMACCR,REPEAT,DMA_DMACCR_REPEAT_ON) |
- DMA_FMK(DMACCR,AUTOINIT,DMA_DMACCR_AUTOINIT_ON) |
- DMA_FMK(DMACCR,EN,DMA_DMACCR_EN_STOP) |
- DMA_FMK(DMACCR,PRIO,DMA_DMACCR_PRIO_HI) |
- DMA_FMK(DMACCR,FS,DMA_DMACCR_FS_DISABLE) ;
-
- dmaTxCfg.dmacicr =
- DMA_FMK(DMACICR,HALFIE,DMA_DMACICR_HALFIE_ON) |
- DMA_FMK(DMACICR,FRAMEIE,DMA_DMACICR_FRAMEIE_ON) ;
- dmaTxCfg.dmacfi = 0x0000;
- dmaTxCfg.dmacei = 0x0000;
- dmaTxCfg.dmacen = 2 * UARTHW_MCBSP_TxPKTBITS;
- dmaTxCfg.dmacfn = 1;
-
-
- /* Rx Side DMA specific configuration */
- dmaRxCfg.dmacsdp =
- DMA_FMK(DMACSDP,DST,DMA_DMACSDP_DST_DARAM) |
- DMA_FMK(DMACSDP,SRC,DMA_DMACSDP_SRC_PERIPH) |
- DMA_FMK(DMACSDP,DATATYPE,DMA_DMACSDP_DATATYPE_16BIT) ;
-
- dmaRxCfg.dmaccr =
- DMA_FMK(DMACCR,DSTAMODE,DMA_DMACCR_DSTAMODE_POSTINC) |
- DMA_FMK(DMACCR,SRCAMODE,DMA_DMACCR_SRCAMODE_CONST) |
- DMA_FMK(DMACCR,ENDPROG,DMA_DMACCR_ENDPROG_OFF) |
- DMA_FMK(DMACCR,REPEAT,DMA_DMACCR_REPEAT_ON) |
- DMA_FMK(DMACCR,AUTOINIT,DMA_DMACCR_AUTOINIT_ON) |
- DMA_FMK(DMACCR,EN,DMA_DMACCR_EN_STOP) |
- DMA_FMK(DMACCR,PRIO,DMA_DMACCR_PRIO_HI) |
- DMA_FMK(DMACCR,FS,DMA_DMACCR_FS_DISABLE) ;
-
- dmaRxCfg.dmacicr =
- DMA_FMK(DMACICR,HALFIE,DMA_DMACICR_HALFIE_ON) |
- DMA_FMK(DMACICR,FRAMEIE,DMA_DMACICR_FRAMEIE_ON) ;
-
- dmaRxCfg.dmacfi = 0x0;
- dmaRxCfg.dmacei = 0x0;
- dmaRxCfg.dmacen = 2 * UARTHW_MCBSP_RxPKTBITS;
- dmaRxCfg.dmacfn = 1;
-
-
- //Check to see which MCBSP port is being used
- if (params->mcbspId == MCBSP_PORT2) {
- dmaRxSynEvt = DMA_DMACCR_SYNC_REVT2;
- dmaTxSynEvt = DMA_DMACCR_SYNC_XEVT2;
- dmaTxDest = MCBSP_ADDR(DXR12) << 1;
- dmaRxSrc = MCBSP_ADDR(DRR12) << 1;
- }
- else if (params->mcbspId == MCBSP_PORT1) {
- dmaRxSynEvt = DMA_DMACCR_SYNC_REVT1;
- dmaTxSynEvt = DMA_DMACCR_SYNC_XEVT1;
- dmaTxDest = MCBSP_ADDR(DXR11) << 1;
- dmaRxSrc = MCBSP_ADDR(DRR11) << 1;
- }
- else {
- dmaRxSynEvt = DMA_DMACCR_SYNC_REVT0;
- dmaTxSynEvt = DMA_DMACCR_SYNC_XEVT0;
- dmaTxDest = MCBSP_ADDR(DXR10) << 1;
- dmaRxSrc = MCBSP_ADDR(DRR10) << 1;
- }
-
-
- if (hDmaTx == INV || hDmaRx == INV) {
- return (IOM_EBADIO);
- }
-
- /* Setup Tx Side addresses based on MCBSP port */
- dmaTxCfg.dmacdsal = (DMA_AdrPtr)(dmaTxDest & 0xFFFF);
- dmaTxCfg.dmacdsau = ((dmaTxDest >> 15) & 0xFFFF);
-
- /* Need '<< 1' for byte addressing */
- tempAdd = (LgUns)(&txBuf[0]) << 1;
- dmaTxCfg.dmacssal = (DMA_AdrPtr)(tempAdd & 0xFFFF);
- dmaTxCfg.dmacssau = ((tempAdd >> 15) & 0xFFFF);
-
- dmaTxCfg.dmaccr |=
- DMA_FMK(DMACCR,SYNC,dmaTxSynEvt);
-
- DMA_config(hDmaTx,&dmaTxCfg);
-
- /* Setup Rx Side addresses based on MCBSP port */
- dmaRxCfg.dmacssal = (DMA_AdrPtr)(dmaRxSrc & 0xFFFF);
- dmaRxCfg.dmacssau = ((dmaRxSrc >> 15) & 0xFFFF);
-
- /* Need '<< 1' for byte addressing */
- tempAdd = (LgUns)(&rxBuf[0]) << 1;
- dmaRxCfg.dmacdsal = (DMA_AdrPtr)(tempAdd & 0xFFFF);
- dmaRxCfg.dmacdsau = ((tempAdd >> 15) & 0xFFFF);
-
- dmaRxCfg.dmaccr |=
- DMA_FMK(DMACCR,SYNC,dmaRxSynEvt);
-
- DMA_config(hDmaRx,&dmaRxCfg);
-
-
- /* Configure DMA to be free running */
- DMA_FSET(DMAGCR,FREE,1);
-
- return(IOM_COMPLETED);
- }
- /*
- * ======== setupMcbsp ========
- * This function is used to setup the McBSP port chosen with the initial
- * settings based on parity, stopbits, databits,baudrates chosen.
- */
- static Int setupMcbsp(UARTHW_MCBSP_Params *params)
- {
- Uns clkdv;
- MCBSP_Config mcbspCfg; /*MCBSP Config Structure*/
- hMcbsp = MCBSP_open(params->mcbspId, MCBSP_OPEN_RESET);
- if (hMcbsp == INV) {
- return (IOM_EBADIO);
- }
- /* Initialize MCBSP Structure */
- MCBSP_getConfig(hMcbsp, &mcbspCfg);
- /* Setup MCBSP Regs */
- mcbspCfg.pcr =
- MCBSP_FMK(PCR,XIOEN,MCBSP_PCR_XIOEN_SP) |
- MCBSP_FMK(PCR,RIOEN,MCBSP_PCR_RIOEN_SP) |
- MCBSP_FMK(PCR,FSXM,MCBSP_PCR_FSXM_INTERNAL) |
- MCBSP_FMK(PCR,FSRM,MCBSP_PCR_FSRM_EXTERNAL) |
- MCBSP_FMK(PCR,CLKXM,MCBSP_PCR_CLKXM_OUTPUT) |
- MCBSP_FMK(PCR,CLKRM,MCBSP_PCR_CLKRM_OUTPUT) |
- MCBSP_FMK(PCR,DXSTAT,MCBSP_PCR_DXSTAT_0) |
- MCBSP_FMK(PCR,FSXP,MCBSP_PCR_FSXP_ACTIVELOW) |
- MCBSP_FMK(PCR,FSRP,MCBSP_PCR_FSRP_ACTIVELOW) |
- MCBSP_FMK(PCR,CLKXP,MCBSP_PCR_CLKXP_RISING) |
- MCBSP_FMK(PCR,CLKRP,MCBSP_PCR_CLKRP_FALLING) ;
- /*
- * Here we compute the bit rate of the McBSP. Each UART bit is
- * represented by 16 McBSP bits.
- */
- clkdv = (Uns)(params->mcbspClkIn / (params->baud * 16));
- /* clkdv is max 8-bits long, so make sure we didn't overflow ... */
- if (clkdv > 0xff) {
- return (IOM_EBADARGS);
- }
- mcbspCfg.srgr1 =
- MCBSP_FMK(SRGR1,CLKGDV,MCBSP_SRGR1_CLKGDV_OF(clkdv)) |
- MCBSP_FMK(SRGR1,FWID,MCBSP_SRGR1_FWID_OF(0)) ;
- mcbspCfg.srgr2 =
- MCBSP_FMK(SRGR2,GSYNC,MCBSP_SRGR2_GSYNC_FREE) |
- MCBSP_FMK(SRGR2,CLKSP,MCBSP_SRGR2_CLKSP_RISING) |
- MCBSP_FMK(SRGR2,CLKSM,MCBSP_SRGR2_CLKSM_INTERNAL) |
- MCBSP_FMK(SRGR2,FSGM,MCBSP_SRGR2_FSGM_DXR2XSR) ;
-
- //Want DUAL Phase to account for Half stop bits
- mcbspCfg.xcr1 =
- MCBSP_FMK(XCR1,XFRLEN1,MCBSP_XCR1_XFRLEN1_OF(8)) |
- MCBSP_FMK(XCR1,XWDLEN1,MCBSP_XCR1_XWDLEN1_16BIT) ;
- mcbspCfg.xcr2 =
- MCBSP_FMK(XCR2,XPHASE,MCBSP_XCR2_XPHASE_DUAL) |
- MCBSP_FMK(XCR2,XFRLEN2,MCBSP_XCR2_XFRLEN2_OF(1)) |
- MCBSP_FMK(XCR2,XWDLEN2,MCBSP_XCR2_XWDLEN2_8BIT) |
- MCBSP_FMK(XCR2,XCOMPAND,MCBSP_XCR2_XCOMPAND_MSB) |
- MCBSP_FMK(XCR2,XFIG,MCBSP_XCR2_XFIG_NO) |
- MCBSP_FMK(XCR2,XDATDLY,MCBSP_XCR2_XDATDLY_0BIT) ;
- mcbspCfg.rcr1 =
- MCBSP_FMK(RCR1,RFRLEN1,MCBSP_RCR1_RFRLEN1_OF(8)) |
- MCBSP_FMK(RCR1,RWDLEN1,MCBSP_RCR1_RWDLEN1_16BIT) ;
- mcbspCfg.rcr2 =
- MCBSP_FMK(RCR2,RPHASE,MCBSP_RCR2_RPHASE_DUAL) |
- MCBSP_FMK(RCR2,RFRLEN2,MCBSP_RCR2_RFRLEN2_OF(0)) |
- MCBSP_FMK(RCR2,RWDLEN2,MCBSP_RCR2_RWDLEN2_8BIT) |
- MCBSP_FMK(RCR2,RCOMPAND,MCBSP_RCR2_RCOMPAND_MSB) |
- MCBSP_FMK(RCR2,RFIG,MCBSP_RCR2_RFIG_NO) |
- MCBSP_FMK(RCR2,RDATDLY,MCBSP_RCR2_RDATDLY_1BIT) ;
- mcbspCfg.spcr1 =
- MCBSP_FMK(SPCR1,DLB,MCBSP_SPCR1_DLB_OFF) |
- MCBSP_FMK(SPCR1,RJUST,MCBSP_SPCR1_RJUST_RZF) |
- MCBSP_FMK(SPCR1,CLKSTP,MCBSP_SPCR1_CLKSTP_DISABLE) |
- MCBSP_FMK(SPCR1,DXENA,MCBSP_SPCR1_DEFAULT) |
- MCBSP_FMK(SPCR1,RINTM,MCBSP_SPCR1_RINTM_RRDY) |
- MCBSP_FMK(SPCR1,RRST,MCBSP_SPCR1_RRST_DISABLE) ;
- mcbspCfg.spcr2 =
- MCBSP_FMK(SPCR2,FREE,MCBSP_SPCR2_FREE_NO) |
- MCBSP_FMK(SPCR2,SOFT,MCBSP_SPCR2_SOFT_YES) |
- MCBSP_FMK(SPCR2,FRST,MCBSP_SPCR2_DEFAULT) |
- MCBSP_FMK(SPCR2,GRST,MCBSP_SPCR2_DEFAULT) |
- MCBSP_FMK(SPCR2,XINTM, MCBSP_SPCR2_XINTM_XRDY) |
- MCBSP_FMK(SPCR2,XSYNCERR,MCBSP_SPCR2_XSYNCERR_NO) ;
-
- /* Assign structure to handle */
- MCBSP_config(hMcbsp, &mcbspCfg);
- return (IOM_COMPLETED);
- }
- /*
- * ======== enable ========
- * This function is used to enable the McBSP and start DMA
- */
- static void enable(MdUns *txBuf)
- {
- /* Start transmit and receive DMA channels */
- DMA_start(hDmaTx);
- DMA_start(hDmaRx);
-
- /* Start the MCBSP and Sample Rate Generator */
- MCBSP_start(hMcbsp, MCBSP_SRGR_START, 0xFFFF);
-
- /* Take MCBSP receive and transmit out of reset */
- MCBSP_start(hMcbsp, MCBSP_XMIT_START | MCBSP_RCV_START, 0xFFFF);
- }
- /*
- * ======== rxIsr ========
- * This function will clear the DMA CSR and call the upper layer ISR
- */
- static void rxIsr(void)
- {
- volatile Uns temp;
-
- temp = DMA_RGETH(hDmaRx, DMACSR); /* DMA_RGET clears interrupt flag */
- UARTHW_MCBSP_dmaRxIsr(); /* Calling the upper layer ISR */
- }
- /*
- * ======== txIsr ========
- * This function will clear the DMA CSR and call the upper layer ISR
- */
- static void txIsr(void)
- {
- volatile Uns temp;
-
- temp = DMA_RGETH(hDmaTx, DMACSR); /* DMA_RGET clears interrupt flag*/
- UARTHW_MCBSP_dmaTxIsr(); /* Calling the upper layer ISR */
- }