C++ (Cpp) do_handle_rx_dma Examples

Example #1

static void tegra_rx_dma_threshold_callback(struct tegra_dma_req *req)
{
	struct tegra_uart_port *t = req->dev;
	unsigned long flags;

	spin_lock_irqsave(&t->uport.lock, flags);

	do_handle_rx_dma(t);

	spin_unlock_irqrestore(&t->uport.lock, flags);
}

Example #2

File: tegra_hsuart.c Project: vocoderism/Tegra-Note-7

static irqreturn_t tegra_uart_isr(int irq, void *data)
{
	struct tegra_uart_port *t = data;
	struct uart_port *u = &t->uport;
	unsigned char iir;
	unsigned char ier;
	bool is_rx_int = false;
	unsigned long flags;

	spin_lock_irqsave(&u->lock, flags);
	t  = container_of(u, struct tegra_uart_port, uport);
	while (1) {
		iir = uart_readb(t, UART_IIR);
		if (iir & UART_IIR_NO_INT) {
			if (likely(t->use_rx_dma) && is_rx_int) {
				do_handle_rx_dma(t);

				if (t->rx_in_progress) {
					ier = t->ier_shadow;
					ier |= (UART_IER_RLSI | UART_IER_RTOIE |
								UART_IER_EORD);
					t->ier_shadow = ier;
					uart_writeb(t, ier, UART_IER);
				}
			}
			spin_unlock_irqrestore(&u->lock, flags);
			return IRQ_HANDLED;
		}

		dev_dbg(u->dev, "tegra_uart_isr iir = 0x%x (%d)\n", iir,
			(iir >> 1) & 0x7);
		switch ((iir >> 1) & 0x7) {
		case 0: /* Modem signal change interrupt */
			do_handle_modem_signal(u);
			break;
		case 1: /* Transmit interrupt only triggered when using PIO */
			t->ier_shadow &= ~UART_IER_THRI;
			uart_writeb(t, t->ier_shadow, UART_IER);
			do_handle_tx_pio(t);
			break;
		case 4: /* End of data */
		case 6: /* Rx timeout */
		case 2: /* Receive */
			if (likely(t->use_rx_dma)) {
				if (!is_rx_int) {
					is_rx_int = true;
					/* Disable interrups */
					ier = t->ier_shadow;
					ier |= UART_IER_RDI;
					uart_writeb(t, ier, UART_IER);
					ier &= ~(UART_IER_RDI | UART_IER_RLSI |
						UART_IER_RTOIE | UART_IER_EORD);
					t->ier_shadow = ier;
					uart_writeb(t, ier, UART_IER);
				}
			} else {
				do_handle_rx_pio(t);

				spin_unlock_irqrestore(&u->lock, flags);
				tty_flip_buffer_push(u->state->port.tty);
				spin_lock_irqsave(&u->lock, flags);
			}
			break;
		case 3: /* Receive error */
			/* FIXME how to handle this? Why do we get here */
			do_decode_rx_error(t, uart_readb(t, UART_LSR));
			break;
		case 5: /* break nothing to handle */
		case 7: /* break nothing to handle */
			break;
		}
	}
}