예제 #1
0
/**
 * serial_omap_irq() - This handles the interrupt from one port
 * @irq: uart port irq number
 * @dev_id: uart port info
 */
static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
{
	struct uart_omap_port *up = dev_id;
	unsigned int iir, lsr;
	unsigned long flags;

	iir = serial_in(up, UART_IIR);
	if (iir & UART_IIR_NO_INT)
		return IRQ_NONE;

	spin_lock_irqsave(&up->port.lock, flags);
	lsr = serial_in(up, UART_LSR);
	if (iir & UART_IIR_RLSI) {
		if (!up->use_dma) {
			if (lsr & UART_LSR_DR)
				receive_chars(up, &lsr);
		} else {
			up->ier &= ~(UART_IER_RDI | UART_IER_RLSI);
			serial_out(up, UART_IER, up->ier);
			if ((serial_omap_start_rxdma(up) != 0) &&
					(lsr & UART_LSR_DR))
				receive_chars(up, &lsr);
		}
	}

	check_modem_status(up);
	if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI))
		transmit_chars(up);

	spin_unlock_irqrestore(&up->port.lock, flags);
	up->port_activity = jiffies;
	return IRQ_HANDLED;
}
/*
 * This handles the interrupt from one port.
 */
static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
{
	struct uart_omap_port *up = dev_id;
	unsigned int iir, lsr;

	iir = serial_in(up, UART_IIR);
	if (iir & UART_IIR_NO_INT)
		return IRQ_NONE;
	lsr = serial_in(up, UART_LSR);
	if ((iir & 0x4) && up->use_dma) {
		up->ier &= ~UART_IER_RDI;
		serial_out(up, UART_IER, up->ier);
		serial_omap_start_rxdma(up);
	}
	else if (lsr & UART_LSR_DR) {
		receive_chars(up, &lsr);
	}
	check_modem_status(up);
	if ((lsr & UART_LSR_THRE) && (iir & 0x2)) {
		transmit_chars(up);
	}
	isr8250_activity = jiffies;

	return IRQ_HANDLED;
}
예제 #3
0
/*
 * This handles the interrupt from one port.
 */
static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
{
	struct uart_omap_port *up = dev_id;
	unsigned int iir, lsr;

	iir = serial_in(up, UART_IIR);
	if (iir & UART_IIR_NO_INT)
		return IRQ_NONE;
	lsr = serial_in(up, UART_LSR);
	if ((iir & 0x4) && up->use_dma) {
		up->ier &= ~UART_IER_RDI;
		serial_out(up, UART_IER, up->ier);
		serial_omap_start_rxdma(up);
	} else if (lsr & UART_LSR_DR) {
		receive_chars(up, &lsr);
		/* XXX: After driver resume optimization, lower this */
		wake_lock_timeout(&omap_serial_wakelock, (HZ * 1));
	}
	check_modem_status(up);
	if ((lsr & UART_LSR_THRE) && (iir & 0x2))
		transmit_chars(up);
	isr8250_activity = jiffies;

	return IRQ_HANDLED;
}
예제 #4
0
static void serial_omap_rx_timeout(unsigned long uart_no)
{
	struct uart_omap_port *up = ui[uart_no - 1];
	unsigned int curr_dma_pos;
	curr_dma_pos = omap_readl(OMAP34XX_DMA4_BASE + OMAP_DMA4_CDAC(up->uart_dma.rx_dma_channel));
	if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) || (curr_dma_pos == 0)) {
		/*
		 * If there is no transfer rx happening for 10sec then stop the dma
		 * else just restart the timer. See if 10 sec can be improved.
		 */
		if (jiffies_to_msecs(jiffies - isr8250_activity) < 10000)
			mod_timer(&up->uart_dma.rx_timer, jiffies +
				usecs_to_jiffies(up->uart_dma.rx_timeout));
		else {
			del_timer(&up->uart_dma.rx_timer);
			serial_omap_stop_rxdma(up);
			up->ier |= UART_IER_RDI;
			serial_out(up, UART_IER, up->ier);
		}

		return;
	} else {
		unsigned int curr_transmitted_size = curr_dma_pos - up->uart_dma.prev_rx_dma_pos;
		up->port.icount.rx += curr_transmitted_size;
		tty_insert_flip_string(up->port.state->port.tty, up->uart_dma.rx_buf + (up->uart_dma.prev_rx_dma_pos - up->uart_dma.rx_buf_dma_phys), curr_transmitted_size);
		queue_work(omap_serial_workqueue, &up->tty_work);
		up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
		if (up->uart_dma.rx_buf_size + up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
			serial_omap_start_rxdma(up);
		} else
			mod_timer(&up->uart_dma.rx_timer,
				  jiffies + usecs_to_jiffies(up->uart_dma.rx_timeout));
		isr8250_activity = jiffies;
	}
}
/**
 * serial_omap_irq() - This handles the interrupt from one port
 * @irq: uart port irq number
 * @dev_id: uart port info
 */
static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
{
	struct uart_omap_port *up = dev_id;
	unsigned int iir, lsr;
	unsigned long flags;

	spin_lock_irqsave(&up->port.lock, flags);
#ifdef CONFIG_PM
	/*
	 * This will enable the clock for some reason if the
	 * clocks get disabled. This would enable the ICK also
	 * in case if the Idle state is set and the PRCM modul
	 * just shutdown the ICK because of inactivity.
	 */
	omap_uart_enable_clock_from_irq(up->pdev->id);
#endif

	iir = serial_in(up, UART_IIR);
	if (iir & UART_IIR_NO_INT) {
		spin_unlock_irqrestore(&up->port.lock, flags);
		return IRQ_NONE;
	}

	lsr = serial_in(up, UART_LSR);
	if (iir & UART_IIR_RLSI) {
		if (!up->use_dma) {
			if (lsr & UART_LSR_DR) {
				receive_chars(up, &lsr);
				if (omap_is_console_port(&up->port) &&
						(up->plat_hold_wakelock)) {
					spin_unlock(&up->port.lock);
					up->plat_hold_wakelock(up, WAKELK_IRQ);
					spin_lock(&up->port.lock);
				}
			}
		} else {
			up->ier &= ~UART_IER_RDI;
			serial_out(up, UART_IER, up->ier);
			if (serial_omap_start_rxdma(up) != 0)
				if (lsr & UART_LSR_DR)
					receive_chars(up, &lsr);
		}
	}

	check_modem_status(up);
	if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI))
		transmit_chars(up);

	spin_unlock_irqrestore(&up->port.lock, flags);
	up->port_activity = jiffies;
	return IRQ_HANDLED;
}
/**
 * serial_omap_irq() - This handles the interrupt from one port
 * @irq: uart port irq number
 * @dev_id: uart port info
 */
static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
{
	struct uart_omap_port *up = dev_id;
	unsigned int iir, lsr;
	unsigned int int_id;
	unsigned long flags;
	int ret = IRQ_HANDLED;
	u8 tx_fifo_lvl;

	serial_omap_port_enable(up);
	iir = serial_in(up, UART_IIR);
	if (iir & UART_IIR_NO_INT) {
		serial_omap_port_disable(up);
		return IRQ_NONE;
	}

	int_id = iir & UART_OMAP_IIR_ID;

	spin_lock_irqsave(&up->port.lock, flags);
	lsr = serial_in(up, UART_LSR);
	if (int_id == UART_IIR_RDI || int_id == UART_OMAP_IIR_RX_TIMEOUT ||
	    int_id == UART_IIR_RLSI) {
		if (!up->use_dma) {
			if (lsr & UART_LSR_DR)
				receive_chars(up, &lsr);
		} else {
			up->ier &= ~(UART_IER_RDI | UART_IER_RLSI);
			serial_out(up, UART_IER, up->ier);
			if ((serial_omap_start_rxdma(up) != 0) &&
					(lsr & UART_LSR_DR))
				receive_chars(up, &lsr);
		}
	}

	check_modem_status(up);
	if (int_id == UART_IIR_THRI) {
		tx_fifo_lvl = serial_in(up, UART_OMAP_TXFIFO_LVL);
		if (lsr & UART_LSR_THRE || tx_fifo_lvl < up->port.fifosize)
			transmit_chars(up, tx_fifo_lvl);
		else
			ret = IRQ_NONE;
	}

	spin_unlock_irqrestore(&up->port.lock, flags);
	serial_omap_port_disable(up);

	up->port_activity = jiffies;
	return ret;
}
예제 #7
0
static void serial_omap_rxdma_poll(unsigned long uart_no)
{
	struct uart_omap_port *up = ui[uart_no];
	unsigned int curr_dma_pos, curr_transmitted_size;
	int ret = 0;

	curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel);
	if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
			     (curr_dma_pos == 0)) {
		if (jiffies_to_msecs(jiffies - up->port_activity) <
						up->uart_dma.rx_timeout) {
			mod_timer(&up->uart_dma.rx_timer, jiffies +
				usecs_to_jiffies(up->uart_dma.rx_poll_rate));
		} else {
			serial_omap_stop_rxdma(up);
			up->ier |= (UART_IER_RDI | UART_IER_RLSI);
			serial_out(up, UART_IER, up->ier);
		}
		return;
	}

	curr_transmitted_size = curr_dma_pos -
					up->uart_dma.prev_rx_dma_pos;
	up->port.icount.rx += curr_transmitted_size;
	tty_insert_flip_string(up->port.state->port.tty,
			up->uart_dma.rx_buf +
			(up->uart_dma.prev_rx_dma_pos -
			up->uart_dma.rx_buf_dma_phys),
			curr_transmitted_size);
	tty_flip_buffer_push(up->port.state->port.tty);
	up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
	if (up->uart_dma.rx_buf_size +
			up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
		ret = serial_omap_start_rxdma(up);
		if (ret < 0) {
			serial_omap_stop_rxdma(up);
			up->ier |= (UART_IER_RDI | UART_IER_RLSI);
			serial_out(up, UART_IER, up->ier);
		}
	} else  {
		mod_timer(&up->uart_dma.rx_timer, jiffies +
			usecs_to_jiffies(up->uart_dma.rx_poll_rate));
	}
	up->port_activity = jiffies;
}
static int serial_omap_startup(struct uart_port *port)
{
	struct uart_omap_port *up = (struct uart_omap_port *)port;
	unsigned long flags;
	int irq_flags = 0;
	int retval;

	/* Zoom2 has GPIO_102 connected to Serial device:
	* Active High
	*/
	if (up->port.flags & UPF_TRIGGER_HIGH)
		irq_flags |= IRQF_TRIGGER_HIGH;
	/*
	 * Allocate the IRQ
	 */
	retval = request_irq(up->port.irq, serial_omap_irq, irq_flags, up->name, up);
	if (retval) {
		return retval;
	}

	/*
	 * Stop the baud clock and disable the UART. UART will be enabled
	 * back in set_termios. This is essential for DMA mode operations.
	 */
	serial_out(up, UART_LCR, UART_LCR_DLAB);
	serial_out(up, UART_DLL, 0);
	serial_out(up, UART_DLM, 0);
	serial_out(up, UART_LCR, 0);
	serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_DISABLE);

	/*
	 * Clear the FIFO buffers and disable them.
	 * (they will be reenabled in set_termios())
	 */
	serial_omap_clear_fifos(up);
	serial_out(up, UART_SCR, 0x00);
	/* For Hardware flow control */
	serial_out(up, UART_MCR, 0x2);

	/*
	 * Clear the interrupt registers.
	 */
	(void) serial_in(up, UART_LSR);
	(void) serial_in(up, UART_RX);
	(void) serial_in(up, UART_IIR);
	(void) serial_in(up, UART_MSR);
	/*
	 * Now, initialize the UART
	 */
	serial_out(up, UART_LCR, UART_LCR_WLEN8);
	spin_lock_irqsave(&up->port.lock, flags);
	if (up->port.flags & UPF_FOURPORT) {
		if (!is_real_interrupt(up->port.irq))
			up->port.mctrl |= TIOCM_OUT1;
	} else {
		/*
		 * Most PC uarts need OUT2 raised to enable interrupts.
		 */
		if (is_real_interrupt(up->port.irq))
			up->port.mctrl |= TIOCM_OUT2;
	}
	serial_omap_set_mctrl(&up->port, up->port.mctrl);
	spin_unlock_irqrestore(&up->port.lock, flags);

	up->msr_saved_flags = 0;



	if (up->port.flags & UPF_FOURPORT) {
		unsigned int icp;
		/*
		 * Enable interrupts on the AST Fourport board
		 */
		icp = (up->port.iobase & 0xfe0) | 0x01f;
		outb_p(0x80, icp);
		(void) inb_p(icp);
	}
	if (up->use_dma) {
		if (!up->is_buf_dma_alloced) {
			free_page((unsigned long)up->port.info->xmit.buf);
			up->port.info->xmit.buf = NULL;
			up->port.info->xmit.buf = dma_alloc_coherent(NULL,
                                               UART_XMIT_SIZE,
                                               (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys), 0);
			up->is_buf_dma_alloced = 1;
		}
		init_timer(&(up->uart_dma.rx_timer));
		up->uart_dma.rx_timer.function = serial_omap_rx_timeout;
		up->uart_dma.rx_timer.data = up->pdev->id;
		/* Currently the buffer size is 4KB. Can increase it later*/
		up->uart_dma.rx_buf = dma_alloc_coherent(NULL,
					up->uart_dma.rx_buf_size,
					(dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0);
		serial_omap_start_rxdma(up);
	} else {
		/*
		* Finally, enable interrupts.  Note: Modem status interrupts
		* are set via set_termios(), which will be occurring imminently
		* anyway, so we don't enable them here.
		*/
		up->ier = UART_IER_RLSI | UART_IER_RDI; //| UART_IER_RTOIE |UART_IER_THRI;
		serial_out(up, UART_IER, up->ier);
	}

	return 0;
}