Пример #1
0
Файл: pl011.c Проект: ESLab/rtdl
portBASE_TYPE xUARTSendCharacter( unsigned long ulUARTPeripheral, signed char cChar, portTickType xDelay )
{
unsigned long ulBase = 0;
portBASE_TYPE xReturn = pdFALSE;
#if UART_USE_INTERRUPT
xQueueHandle xTxQueue = NULL;
unsigned char ucStatus = 0;
#endif	/* UART_USE_INTERRUPT */

	switch ( ulUARTPeripheral )
	{
	case 0:
		ulBase = UART0_BASE;
		#if UART_USE_INTERRUPT
		xTxQueue = xUartQueues[0][TX_QUEUE];
		#endif
		break;
	case 1:
		ulBase = UART1_BASE;
		#if UART_USE_INTERRUPT
		xTxQueue = xUartQueues[1][TX_QUEUE];
		#endif
		break;
	case 2:
		ulBase = UART2_BASE;
		#if UART_USE_INTERRUPT
		xTxQueue = xUartQueues[2][TX_QUEUE];
		#endif
		break;
	case 3:
		ulBase = UART3_BASE;
		#if UART_USE_INTERRUPT
		xTxQueue = xUartQueues[3][TX_QUEUE];
		#endif
		break;
	}

	if ( 0 != ulBase )
	{
#if UART_USE_INTERRUPT
		xReturn = xQueueSend( xTxQueue, &cChar, xDelay );
		taskENTER_CRITICAL();
			ucStatus = *UARTFR(ulBase);
		taskEXIT_CRITICAL();

		if ( ucStatus & UART_FLAG_TXFE )
		{
			/* Need to kick of the Tx. */
			(void)xQueueReceive( xTxQueue, &cChar, 0 );
			*UARTDR(ulBase) = cChar;
			xReturn = pdTRUE;
		}
#else
		while ( !(*UARTFR(ulBase) & UART_FLAG_TXFE) );
		*UARTDR(ulBase) = cChar;
		xReturn = pdTRUE;
#endif	/* UART_USE_INTERRUPT */
	}
	return xReturn;
}
Пример #2
0
static irqreturn_t clps711xuart_int_tx(int irq, void *dev_id)
{
	struct uart_port *port = dev_id;
	struct circ_buf *xmit = &port->state->xmit;
	int count;

	if (port->x_char) {
		clps_writel(port->x_char, UARTDR(port));
		port->icount.tx++;
		port->x_char = 0;
		return IRQ_HANDLED;
	}
	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
		clps711xuart_stop_tx(port);
		return IRQ_HANDLED;
	}

	count = port->fifosize >> 1;
	do {
		clps_writel(xmit->buf[xmit->tail], UARTDR(port));
		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
		port->icount.tx++;
		if (uart_circ_empty(xmit))
			break;
	} while (--count > 0);

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(port);

	if (uart_circ_empty(xmit))
		clps711xuart_stop_tx(port);

	return IRQ_HANDLED;
}
Пример #3
0
static irqreturn_t uart_clps711x_int_tx(int irq, void *dev_id)
{
	struct uart_port *port = dev_id;
	struct clps711x_port *s = dev_get_drvdata(port->dev);
	struct circ_buf *xmit = &port->state->xmit;

	if (port->x_char) {
		clps_writew(port->x_char, UARTDR(port));
		port->icount.tx++;
		port->x_char = 0;
		return IRQ_HANDLED;
	}

	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
		disable_irq_nosync(TX_IRQ(port));
		s->tx_enabled[port->line] = 0;
		return IRQ_HANDLED;
	}

	while (!uart_circ_empty(xmit)) {
		clps_writew(xmit->buf[xmit->tail], UARTDR(port));
		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
		port->icount.tx++;
		if (clps_readl(SYSFLG(port) & SYSFLG_UTXFF))
			break;
	}

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(port);

	return IRQ_HANDLED;
}
Пример #4
0
static void uart_clps711x_console_putchar(struct uart_port *port, int ch)
{
	while (clps_readl(SYSFLG(port)) & SYSFLG_UTXFF)
		barrier();

	clps_writew(ch, UARTDR(port));
}
Пример #5
0
static irqreturn_t clps711xuart_int_rx(int irq, void *dev_id, struct pt_regs *regs)
{
	struct uart_port *port = dev_id;
	struct tty_struct *tty = port->info->tty;
	unsigned int status, ch, flg, ignored = 0;

	status = clps_readl(SYSFLG(port));
	while (!(status & SYSFLG_URXFE)) {
		ch = clps_readl(UARTDR(port));

		if (tty->flip.count >= TTY_FLIPBUF_SIZE)
			goto ignore_char;
		port->icount.rx++;

		flg = TTY_NORMAL;

		/*
		 * Note that the error handling code is
		 * out of the main execution path
		 */
		if (unlikely(ch & UART_ANY_ERR)) {
			if (ch & UARTDR_PARERR)
				port->icount.parity++;
			else if (ch & UARTDR_FRMERR)
				port->icount.frame++;
			if (ch & UARTDR_OVERR)
				port->icount.overrun++;

			ch &= port->read_status_mask;

			if (ch & UARTDR_PARERR)
				flg = TTY_PARITY;
			else if (ch & UARTDR_FRMERR)
				flg = TTY_FRAME;

#ifdef SUPPORT_SYSRQ
			port->sysrq = 0;
#endif
		}

		if (uart_handle_sysrq_char(port, ch, regs))
			goto ignore_char;

		/*
		 * CHECK: does overrun affect the current character?
		 * ASSUMPTION: it does not.
		 */
		uart_insert_char(port, ch, UARTDR_OVERR, ch, flg);

	ignore_char:
		status = clps_readl(SYSFLG(port));
	}
	tty_flip_buffer_push(tty);
	return IRQ_HANDLED;
}
Пример #6
0
static irqreturn_t uart_clps711x_int_rx(int irq, void *dev_id)
{
	struct uart_port *port = dev_id;
	struct tty_struct *tty = tty_port_tty_get(&port->state->port);
	unsigned int status, ch, flg;

	if (!tty)
		return IRQ_HANDLED;

	for (;;) {
		status = clps_readl(SYSFLG(port));
		if (status & SYSFLG_URXFE)
			break;

		ch = clps_readw(UARTDR(port));
		status = ch & (UARTDR_FRMERR | UARTDR_PARERR | UARTDR_OVERR);
		ch &= 0xff;

		port->icount.rx++;
		flg = TTY_NORMAL;

		if (unlikely(status)) {
			if (status & UARTDR_PARERR)
				port->icount.parity++;
			else if (status & UARTDR_FRMERR)
				port->icount.frame++;
			else if (status & UARTDR_OVERR)
				port->icount.overrun++;

			status &= port->read_status_mask;

			if (status & UARTDR_PARERR)
				flg = TTY_PARITY;
			else if (status & UARTDR_FRMERR)
				flg = TTY_FRAME;
			else if (status & UARTDR_OVERR)
				flg = TTY_OVERRUN;
		}

		if (uart_handle_sysrq_char(port, ch))
			continue;

		if (status & port->ignore_status_mask)
			continue;

		uart_insert_char(port, status, UARTDR_OVERR, ch, flg);
	}

	tty_flip_buffer_push(tty);

	tty_kref_put(tty);

	return IRQ_HANDLED;
}
/*
 *	Print a string to the serial port trying not to disturb
 *	any possible real use of the port...
 *
 *	The console_lock must be held when we get here.
 *
 *	Note that this is called with interrupts already disabled
 */
static void
clps711xuart_console_write(struct console *co, const char *s,
			   unsigned int count)
{
	struct uart_port *port = clps711x_ports + co->index;
	unsigned int status, syscon;
	int i;

	/*
	 *	Ensure that the port is enabled.
	 */
	syscon = clps_readl(SYSCON(port));
	clps_writel(syscon | SYSCON_UARTEN, SYSCON(port));

	/*
	 *	Now, do each character
	 */
	for (i = 0; i < count; i++) {
		do {
			status = clps_readl(SYSFLG(port));
		} while (status & SYSFLG_UTXFF);
		clps_writel(s[i], UARTDR(port));
		if (s[i] == '\n') {
			do {
				status = clps_readl(SYSFLG(port));
			} while (status & SYSFLG_UTXFF);
			clps_writel('\r', UARTDR(port));
		}
	}

	/*
	 *	Finally, wait for transmitter to become empty
	 *	and restore the uart state.
	 */
	do {
		status = clps_readl(SYSFLG(port));
	} while (status & SYSFLG_UBUSY);

	clps_writel(syscon, SYSCON(port));
}
Пример #8
0
Файл: pl011.c Проект: ESLab/rtdl
portBASE_TYPE xUARTReceiveCharacter( unsigned long ulUARTPeripheral, signed char *pcChar, portTickType xDelay )
{
unsigned long ulBase = 0;
portBASE_TYPE xReturn = pdFALSE;
#if UART_USE_INTERRUPT
xQueueHandle xRxQueue = NULL;
#endif

	switch ( ulUARTPeripheral )
	{
	case 0:
		ulBase = UART0_BASE;
		#if UART_USE_INTERRUPT
		xRxQueue = xUartQueues[0][RX_QUEUE];
		#endif
		break;
	case 1:
		ulBase = UART1_BASE;
		#if UART_USE_INTERRUPT
		xRxQueue = xUartQueues[1][RX_QUEUE];
		#endif
		break;
	case 2:
		ulBase = UART2_BASE;
		#if UART_USE_INTERRUPT
		xRxQueue = xUartQueues[2][RX_QUEUE];
		#endif
		break;
	case 3:
		ulBase = UART3_BASE;
		#if UART_USE_INTERRUPT
		xRxQueue = xUartQueues[3][RX_QUEUE];
		#endif
		break;
	}

	if ( 0 != ulBase )
	{
#if UART_USE_INTERRUPT
		xReturn = xQueueReceive( xRxQueue, pcChar, xDelay );
#else
		if ( ( *UARTFR(ulBase) & UART_FLAG_RXFE ) == 0 )
		{
			*pcChar = *UARTDR(ulBase);
			xReturn = pdTRUE;
		}
#endif /* UART_USE_INTERRUPT */
	}

	return xReturn;
}
Пример #9
0
static void clps711xuart_int_tx(int irq, void *dev_id, struct pt_regs *regs)
{
	struct uart_info *info = dev_id;
	struct uart_port *port = info->port;
	int count;

	if (port->x_char) {
		clps_writel(port->x_char, UARTDR(port));
		port->icount.tx++;
		port->x_char = 0;
		return;
	}
	if (info->xmit.head == info->xmit.tail
	    || info->tty->stopped
	    || info->tty->hw_stopped) {
		clps711xuart_stop_tx(info->port, 0);
		return;
	}

	count = port->fifosize >> 1;
	do {
		clps_writel(info->xmit.buf[info->xmit.tail], UARTDR(port));
		info->xmit.tail = (info->xmit.tail + 1) & (UART_XMIT_SIZE - 1);
		port->icount.tx++;
		if (info->xmit.head == info->xmit.tail)
			break;
	} while (--count > 0);

	if (CIRC_CNT(info->xmit.head,
		     info->xmit.tail,
		     UART_XMIT_SIZE) < WAKEUP_CHARS)
		uart_event(info, EVT_WRITE_WAKEUP);

	if (info->xmit.head == info->xmit.tail)
		clps711xuart_stop_tx(info->port, 0);
}
Пример #10
0
static void clps711xuart_int_rx(int irq, void *dev_id, struct pt_regs *regs)
{
	struct uart_info *info = dev_id;
	struct tty_struct *tty = info->tty;
	unsigned int status, ch, flg, ignored = 0;
	struct uart_port *port = info->port;

	status = clps_readl(SYSFLG(port));
	while (!(status & SYSFLG_URXFE)) {
		ch = clps_readl(UARTDR(port));

		if (tty->flip.count >= TTY_FLIPBUF_SIZE)
			goto ignore_char;
		port->icount.rx++;

		flg = TTY_NORMAL;

		/*
		 * Note that the error handling code is
		 * out of the main execution path
		 */
		if (ch & UART_ANY_ERR)
			goto handle_error;

		if (uart_handle_sysrq_char(info, ch, regs))
			goto ignore_char;

	error_return:
		*tty->flip.flag_buf_ptr++ = flg;
		*tty->flip.char_buf_ptr++ = ch;
		tty->flip.count++;
	ignore_char:
		status = clps_readl(SYSFLG(port));
	}
out:
	tty_flip_buffer_push(tty);
	return;

handle_error:
	if (ch & UARTDR_PARERR)
		port->icount.parity++;
	else if (ch & UARTDR_FRMERR)
		port->icount.frame++;
	if (ch & UARTDR_OVERR)
		port->icount.overrun++;

	if (ch & port->ignore_status_mask) {
		if (++ignored > 100)
			goto out;
		goto ignore_char;
	}
	ch &= port->read_status_mask;

	if (ch & UARTDR_PARERR)
		flg = TTY_PARITY;
	else if (ch & UARTDR_FRMERR)
		flg = TTY_FRAME;

	if (ch & UARTDR_OVERR) {
		/*
		 * CHECK: does overrun affect the current character?
		 * ASSUMPTION: it does not.
		 */
		*tty->flip.flag_buf_ptr++ = flg;
		*tty->flip.char_buf_ptr++ = ch;
		tty->flip.count++;
		if (tty->flip.count >= TTY_FLIPBUF_SIZE)
			goto ignore_char;
		ch = 0;
		flg = TTY_OVERRUN;
	}
#ifdef SUPPORT_SYSRQ
	info->sysrq = 0;
#endif
	goto error_return;
}
Пример #11
0
Файл: pl011.c Проект: ESLab/rtdl
void vUARTInterruptHandler( void *pvBaseAddress )
{
unsigned long ulBase = (unsigned long)pvBaseAddress;
unsigned short usStatus = 0;
signed char cTransmitChar = 0;
signed char cReceiveChar = 0;
portBASE_TYPE xTaskWoken = pdFALSE;
xQueueHandle xTxQueue = NULL;
xQueueHandle xRxQueue = NULL;
unsigned long ulUART = 0;

	/* Select the UART Queues. */
	switch ( ulBase )
	{
	case UART0_BASE:
		ulUART = 0;
		break;
	case UART1_BASE:
		ulUART = 1;
		break;
	case UART2_BASE:
		ulUART = 2;
		break;
	case UART3_BASE:
		ulUART = 3;
		break;
	}

	xTxQueue = xUartQueues[ulUART][TX_QUEUE];
	xRxQueue = xUartQueues[ulUART][RX_QUEUE];

	/* Figure out the reason for the interrupt. */
	usStatus = *UARTMIS(ulBase);

	if ( usStatus & UART_INT_STATUS_TX )
	{
		/* Buffer is almost empty, try to refill. */
		while ( *UARTFR(ulBase) & UART_FLAG_TXFF )
		{
			if ( pdTRUE == xQueueReceiveFromISR( xTxQueue, &cTransmitChar, &xTaskWoken ) )
			{
				*UARTDR(ulBase) = cTransmitChar;
			}
			else
			{
				/* Run out of characters to send. */
				break;
			}
		}
	}

	if ( usStatus & UART_INT_STATUS_RX )
	{
		/* Receive Buffer is almost full. */
		while ( !( *UARTFR(ulBase) & UART_FLAG_RXFE ) )
		{
			cReceiveChar = *UARTDR(ulBase);
			if ( pdTRUE != xQueueSendFromISR( xRxQueue, &cReceiveChar, &xTaskWoken ) )
			{
				/* Receive Queue is Full. */
				/* Not good as we are going to lose this character. */
				break;
			}
		}
	}

	/* Here we should deal with any errors. */

	/* Acknownledge the interrupt. */
	*UARTICR(ulBase) = usStatus;

	/* Finally, switch task if necessary. */
	portEND_SWITCHING_ISR(xTaskWoken);
}