xref: /openbmc/linux/drivers/tty/serial/8250/8250_dma.c (revision 5ea5b24da80322b8136cb000a7340cdc29a3d6dc)

/*
 * 8250_dma.c - DMA Engine API support for 8250.c
 *
 * Copyright (C) 2013 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_reg.h>
#include <linux/dma-mapping.h>

#include "8250.h"

static void __dma_tx_complete(void *param)
{
	struct uart_8250_port	*p = param;
	struct uart_8250_dma	*dma = p->dma;
	struct circ_buf		*xmit = &p->port.state->xmit;

	dma->tx_running = 0;

	dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr,
				UART_XMIT_SIZE, DMA_TO_DEVICE);

	xmit->tail += dma->tx_size;
	xmit->tail &= UART_XMIT_SIZE - 1;
	p->port.icount.tx += dma->tx_size;

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(&p->port);

	if (!uart_circ_empty(xmit) && !uart_tx_stopped(&p->port))
		serial8250_tx_dma(p);
}

static void __dma_rx_complete(void *param)
{
	struct uart_8250_port	*p = param;
	struct uart_8250_dma	*dma = p->dma;
	struct tty_port		*tty_port = &p->port.state->port;
	struct dma_tx_state	state;
	int			count;

	dma_sync_single_for_cpu(dma->rxchan->device->dev, dma->rx_addr,
				dma->rx_size, DMA_FROM_DEVICE);

	dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state);
	dmaengine_terminate_all(dma->rxchan);

	count = dma->rx_size - state.residue;

	tty_insert_flip_string(tty_port, dma->rx_buf, count);
	p->port.icount.rx += count;

	tty_flip_buffer_push(tty_port);
}

int serial8250_tx_dma(struct uart_8250_port *p)
{
	struct uart_8250_dma		*dma = p->dma;
	struct circ_buf			*xmit = &p->port.state->xmit;
	struct dma_async_tx_descriptor	*desc;

	if (uart_tx_stopped(&p->port) || dma->tx_running ||
	    uart_circ_empty(xmit))
		return 0;

	dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);

	desc = dmaengine_prep_slave_single(dma->txchan,
					   dma->tx_addr + xmit->tail,
					   dma->tx_size, DMA_MEM_TO_DEV,
					   DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (!desc)
		return -EBUSY;

	dma->tx_running = 1;

	desc->callback = __dma_tx_complete;
	desc->callback_param = p;

	dma->tx_cookie = dmaengine_submit(desc);

	dma_sync_single_for_device(dma->txchan->device->dev, dma->tx_addr,
				   UART_XMIT_SIZE, DMA_TO_DEVICE);

	dma_async_issue_pending(dma->txchan);

	return 0;
}
EXPORT_SYMBOL_GPL(serial8250_tx_dma);

int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
{
	struct uart_8250_dma		*dma = p->dma;
	struct dma_async_tx_descriptor	*desc;
	struct dma_tx_state		state;
	int				dma_status;

	/*
	 * If RCVR FIFO trigger level was not reached, complete the transfer and
	 * let 8250.c copy the remaining data.
	 */
	if ((iir & 0x3f) == UART_IIR_RX_TIMEOUT) {
		dma_status = dmaengine_tx_status(dma->rxchan, dma->rx_cookie,
						&state);
		if (dma_status == DMA_IN_PROGRESS) {
			dmaengine_pause(dma->rxchan);
			__dma_rx_complete(p);
		}
		return -ETIMEDOUT;
	}

	desc = dmaengine_prep_slave_single(dma->rxchan, dma->rx_addr,
					   dma->rx_size, DMA_DEV_TO_MEM,
					   DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (!desc)
		return -EBUSY;

	desc->callback = __dma_rx_complete;
	desc->callback_param = p;

	dma->rx_cookie = dmaengine_submit(desc);

	dma_sync_single_for_device(dma->rxchan->device->dev, dma->rx_addr,
				   dma->rx_size, DMA_FROM_DEVICE);

	dma_async_issue_pending(dma->rxchan);

	return 0;
}
EXPORT_SYMBOL_GPL(serial8250_rx_dma);

int serial8250_request_dma(struct uart_8250_port *p)
{
	struct uart_8250_dma	*dma = p->dma;
	dma_cap_mask_t		mask;

	dma->rxconf.src_addr = p->port.mapbase + UART_RX;
	dma->txconf.dst_addr = p->port.mapbase + UART_TX;

	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);

	/* Get a channel for RX */
	dma->rxchan = dma_request_channel(mask, dma->fn, dma->rx_param);
	if (!dma->rxchan)
		return -ENODEV;

	dmaengine_slave_config(dma->rxchan, &dma->rxconf);

	/* Get a channel for TX */
	dma->txchan = dma_request_channel(mask, dma->fn, dma->tx_param);
	if (!dma->txchan) {
		dma_release_channel(dma->rxchan);
		return -ENODEV;
	}

	dmaengine_slave_config(dma->txchan, &dma->txconf);

	/* RX buffer */
	if (!dma->rx_size)
		dma->rx_size = PAGE_SIZE;

	dma->rx_buf = dma_alloc_coherent(dma->rxchan->device->dev, dma->rx_size,
					&dma->rx_addr, GFP_KERNEL);
	if (!dma->rx_buf) {
		dma_release_channel(dma->rxchan);
		dma_release_channel(dma->txchan);
		return -ENOMEM;
	}

	/* TX buffer */
	dma->tx_addr = dma_map_single(dma->txchan->device->dev,
					p->port.state->xmit.buf,
					UART_XMIT_SIZE,
					DMA_TO_DEVICE);

	dev_dbg_ratelimited(p->port.dev, "got both dma channels\n");

	return 0;
}
EXPORT_SYMBOL_GPL(serial8250_request_dma);

void serial8250_release_dma(struct uart_8250_port *p)
{
	struct uart_8250_dma *dma = p->dma;

	if (!dma)
		return;

	/* Release RX resources */
	dmaengine_terminate_all(dma->rxchan);
	dma_free_coherent(dma->rxchan->device->dev, dma->rx_size, dma->rx_buf,
			  dma->rx_addr);
	dma_release_channel(dma->rxchan);
	dma->rxchan = NULL;

	/* Release TX resources */
	dmaengine_terminate_all(dma->txchan);
	dma_unmap_single(dma->txchan->device->dev, dma->tx_addr,
			 UART_XMIT_SIZE, DMA_TO_DEVICE);
	dma_release_channel(dma->txchan);
	dma->txchan = NULL;
	dma->tx_running = 0;

	dev_dbg_ratelimited(p->port.dev, "dma channels released\n");
}
EXPORT_SYMBOL_GPL(serial8250_release_dma);