arch/arm/plat-feroceon/mv_hal/uart/mvUart.c

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#include "mvCommon.h"
#include "mvOs.h"
#include "ctrlEnv/mvCtrlEnvSpec.h"
#include "mvUart.h"

/* static variables */
static volatile MV_UART_PORT *uartBase[MV_UART_MAX_CHAN];

/*******************************************************************************
* mvUartInit - Init a uart port.
*
* DESCRIPTION:
*       This routine Initialize one of the uarts ports (channels).
*	It initialize the baudrate, stop bit,parity bit etc.
*
* INPUT:
*       port - uart port number.
*	baudDivisor - baud divisior to use for the uart port.
*
* OUTPUT:
*       None.
*
* RETURN:
*	None.
*
*******************************************************************************/
MV_VOID mvUartInit(MV_U32 port, MV_U32 baudDivisor, MV_UART_PORT *base)
{
	volatile MV_UART_PORT *pUartPort;

#if defined(MV_UART_OVER_PEX_WA) || defined(MV_UART_OVER_PCI_WA)
	uartBase[port] = pUartPort = (volatile MV_UART_PORT *)(base);
	return;
#else
	uartBase[port] = pUartPort = (volatile MV_UART_PORT *)base;

	pUartPort->ier = 0x00;
	pUartPort->lcr = LCR_DIVL_EN;	/* Access baud rate */
	pUartPort->dll = baudDivisor & 0xff;	/* 9600 baud */
	pUartPort->dlm = (baudDivisor >> 8) & 0xff;
	pUartPort->lcr = LCR_8N1;	/* 8 data, 1 stop, no parity */

	/* Clear & enable FIFOs */
	pUartPort->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;
	return;
#endif
}

#ifdef MV78XX0
#define UART_EXTERNAL_CONTROL_REG			0x10700
/*******************************************************************************
* mvUartDmaInit - Init a uart port in DMA mode.
*
* DESCRIPTION:
*       This routine Initialize one of the uart ports (channels) to use DMA mode
*	    for transmission. It initialize the baudrate, stop bit,parity bit etc.
*       It also initializes IDMA channel 0 for UART transmission.
*       Once DMA based UART is configured IDMA channel 0 must not be used elsewhere.
*
* INPUT:
*       port - uart port number.
*	    baudDivisor - baud divisior to use for the uart port.
*       idmaWinNum - The IDMA BAR to use for UART transfer (must be 1-3)
*       srcBurstSize - the IDMA source burst size (8,16,32,64,128)
*
* OUTPUT:
*       None.
*
* RETURN:
*	None.
*
*******************************************************************************/
MV_VOID mvUartDmaInit(MV_U32 port, MV_U32 baudDivisor, MV_UART_PORT *base, MV_U32 idmaWinNum, MV_U32 srcBurstSize)
{
	volatile MV_UART_PORT *pUartPort;
	MV_U32 srcBurstLim;

	/*set the UART channel to use the IDMA */
	MV_REG_BIT_SET(UART_EXTERNAL_CONTROL_REG, BIT0 | (BIT8 << port));

	uartBase[port] = pUartPort = (volatile MV_UART_PORT *)base;
	mvUartInit(port, baudDivisor, base);

	pUartPort->mcr = MCR_AFCE;	/* Enable Auto flow control */
	/* Set IDMA BAR target to UART */
	MV_REG_BIT_RESET(IDMA_BASE_ADDR_REG(idmaWinNum), 0xffff);
	MV_REG_BIT_SET(IDMA_BASE_ADDR_REG(idmaWinNum), 0x0101);	/*Set BAR to UART */

	/* Set IDMA0 channel to UART mode */
	switch (srcBurstSize) {
	case 8:
		srcBurstLim = ICCLR_SRC_BURST_LIM_8BYTE;
		break;
	case 16:
		srcBurstLim = ICCLR_SRC_BURST_LIM_16BYTE;
		break;
	case 32:
		srcBurstLim = ICCLR_SRC_BURST_LIM_32BYTE;
		break;
	case 64:
		srcBurstLim = ICCLR_SRC_BURST_LIM_64BYTE;
		break;
	case 128:
		srcBurstLim = ICCLR_SRC_BURST_LIM_128BYTE;
		break;
	default:
		mvOsPrintf("mvUartDmaInit:ERR. Illegal source burst limit, \
	setting to 128B default\n");
		srcBurstLim = ICCLR_SRC_BURST_LIM_128BYTE;
		break;
	}
	mvDmaCtrlLowSet(0, 0x18220 | srcBurstLim);	/*channel control low according FS */
	mvDmaOverrideSet(0, idmaWinNum, DMA_DST_ADDR);
	return;
}

/*******************************************************************************
* mvUartDmaTransmit - Transmit a buffer over the UART using the IDMA.
*
* DESCRIPTION:
*       This routine transmits a buffer over the UART port using IDMA0.
*
* INPUT:
*       port - uart port number.
*	    byteCount - The total number of bytes to be transferred to the UART.
*       srcAddr - The source address of the buffer to be transferred.
*
* OUTPUT:
*       None.
*
* RETURN:
*	    MV_OK.
*
*******************************************************************************/
MV_STATUS mvUartDmaTransmit(MV_U32 port, MV_U32 byteCount, MV_U32 srcAddr)
{
	MV_U32 dstAddr, tmp;

	/* Verify IDMA 0 is not busy */
	if (mvDmaStateGet(port) != MV_IDLE) {
		mvOsPrintf("mvUartDmaTransmit: ERR. IDMA 0 busy.\n");
		return MV_ERROR;
	}

	/* Verify byte count is legal, and choose either 64K mode or 16M mode */
	if (byteCount >= 0x1000000) {
		mvOsPrintf("mvUartDmaTransmit: ERR. Illegal Byte count.\n");
		return MV_ERROR;
	} else if (byteCount >= 0x10000) {
		byteCount |= BIT31;
		MV_REG_BIT_SET(IDMA_CTRL_LOW_REG(0), BIT31);
	} else
		MV_REG_BIT_RESET(IDMA_CTRL_LOW_REG(0), BIT31);

	/* Calculate UART destination address from assigned BAR */
	tmp = MV_REG_READ(IDMA_CTRL_LOW_REG(0));
	tmp = (tmp >> 23) & 0x3;	/* Extract the destination override window number */

	/* Check that destination BAR is configured and calculate destination address */
	if ((MV_REG_READ(IDMA_BASE_ADDR_REG(tmp)) & 0xffff) != 0x0101) {
		mvOsPrintf("mvUartDmaTransmit: ERR. IDMA UART BAR isn't configured.\n");
		return MV_ERROR;
	} else
		dstAddr = (MV_REG_READ(IDMA_BASE_ADDR_REG(tmp)) & 0xffff0000) | (port << 8);

	/* Start transfer */
	if (mvDmaTransfer(0, srcAddr, dstAddr, byteCount, 0x0) == MV_OK)
		return MV_OK;
	else
		return MV_ERROR;
}
#endif /* MV78XX0 */
/*******************************************************************************
* mvUartPutc - Send char to the uart port.
*
* DESCRIPTION:
*       This routine puts one charachetr on one of the uart ports.
*
* INPUT:
*       port - uart port number.
*	c - character.
*
* OUTPUT:
*       None.
*
* RETURN:
*	None.
*
*******************************************************************************/
MV_VOID mvUartPutc(MV_U32 port, MV_U8 c)
{
	volatile MV_UART_PORT *pUartPort = uartBase[port];
	while ((pUartPort->lsr & LSR_THRE) == 0)
		;
	pUartPort->thr = c;
	return;
}

/*******************************************************************************
* mvUartGetc - Get char from uart port.
*
* DESCRIPTION:
*       This routine gets one charachetr from one of the uart ports.
*
* INPUT:
*       port - uart port number.
*
* OUTPUT:
*       None.
*
* RETURN:
*	carachter from the uart port.
*
*******************************************************************************/
MV_U8 mvUartGetc(MV_U32 port)
{
	volatile MV_UART_PORT *pUartPort = uartBase[port];
	while ((pUartPort->lsr & LSR_DR) == 0)
		;
	return (pUartPort->rbr);
}

/*******************************************************************************
* mvUartTstc - test for char in uart port.
*
* DESCRIPTION:
*       This routine heck if a charachter is ready to be read from one of the
*	the uart ports.
*
* INPUT:
*       port - uart port number.
*
* OUTPUT:
*       None.
*
* RETURN:
*	None.
*
*******************************************************************************/
MV_BOOL mvUartTstc(MV_U32 port)
{
	volatile MV_UART_PORT *pUartPort = uartBase[port];
	return ((pUartPort->lsr & LSR_DR) != 0);
}