summaryrefslogtreecommitdiff
path: root/drivers/tty
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/imx.c141
1 files changed, 78 insertions, 63 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 0df2b1c091ae..1912136f7257 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -222,6 +222,9 @@ struct imx_port {
struct dma_chan *dma_chan_rx, *dma_chan_tx;
struct scatterlist rx_sgl, tx_sgl[2];
void *rx_buf;
+ struct circ_buf rx_ring;
+ unsigned int rx_periods;
+ dma_cookie_t rx_cookie;
unsigned int tx_bytes;
unsigned int dma_tx_nents;
wait_queue_head_t dma_wait;
@@ -932,30 +935,6 @@ static void imx_timeout(unsigned long data)
}
#define RX_BUF_SIZE (PAGE_SIZE)
-static void imx_rx_dma_done(struct imx_port *sport)
-{
- unsigned long temp;
- unsigned long flags;
-
- spin_lock_irqsave(&sport->port.lock, flags);
-
- /* re-enable interrupts to get notified when new symbols are incoming */
- temp = readl(sport->port.membase + UCR1);
- temp |= UCR1_RRDYEN;
- writel(temp, sport->port.membase + UCR1);
-
- temp = readl(sport->port.membase + UCR2);
- temp |= UCR2_ATEN;
- writel(temp, sport->port.membase + UCR2);
-
- sport->dma_is_rxing = 0;
-
- /* Is the shutdown waiting for us? */
- if (waitqueue_active(&sport->dma_wait))
- wake_up(&sport->dma_wait);
-
- spin_unlock_irqrestore(&sport->port.lock, flags);
-}
/*
* There are two kinds of RX DMA interrupts(such as in the MX6Q):
@@ -972,43 +951,75 @@ static void dma_rx_callback(void *data)
struct scatterlist *sgl = &sport->rx_sgl;
struct tty_port *port = &sport->port.state->port;
struct dma_tx_state state;
+ struct circ_buf *rx_ring = &sport->rx_ring;
enum dma_status status;
- unsigned int count;
-
- /* unmap it first */
- dma_unmap_sg(sport->port.dev, sgl, 1, DMA_FROM_DEVICE);
+ unsigned int w_bytes = 0;
+ unsigned int r_bytes;
+ unsigned int bd_size;
status = dmaengine_tx_status(chan, (dma_cookie_t)0, &state);
- count = RX_BUF_SIZE - state.residue;
- dev_dbg(sport->port.dev, "We get %d bytes.\n", count);
+ if (status == DMA_ERROR) {
+ dev_err(sport->port.dev, "DMA transaction error.\n");
+ return;
+ }
+
+ if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) {
+
+ /*
+ * The state-residue variable represents the empty space
+ * relative to the entire buffer. Taking this in consideration
+ * the head is always calculated base on the buffer total
+ * length - DMA transaction residue. The UART script from the
+ * SDMA firmware will jump to the next buffer descriptor,
+ * once a DMA transaction if finalized (IMX53 RM - A.4.1.2.4).
+ * Taking this in consideration the tail is always at the
+ * beginning of the buffer descriptor that contains the head.
+ */
+
+ /* Calculate the head */
+ rx_ring->head = sg_dma_len(sgl) - state.residue;
+
+ /* Calculate the tail. */
+ bd_size = sg_dma_len(sgl) / sport->rx_periods;
+ rx_ring->tail = ((rx_ring->head-1) / bd_size) * bd_size;
+
+ if (rx_ring->head <= sg_dma_len(sgl) &&
+ rx_ring->head > rx_ring->tail) {
+
+ /* Move data from tail to head */
+ r_bytes = rx_ring->head - rx_ring->tail;
+
+ /* CPU claims ownership of RX DMA buffer */
+ dma_sync_sg_for_cpu(sport->port.dev, sgl, 1,
+ DMA_FROM_DEVICE);
- if (count) {
- if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) {
- int bytes = tty_insert_flip_string(port, sport->rx_buf,
- count);
+ w_bytes = tty_insert_flip_string(port,
+ sport->rx_buf + rx_ring->tail, r_bytes);
- if (bytes != count)
+ /* UART retrieves ownership of RX DMA buffer */
+ dma_sync_sg_for_device(sport->port.dev, sgl, 1,
+ DMA_FROM_DEVICE);
+
+ if (w_bytes != r_bytes)
sport->port.icount.buf_overrun++;
+
+ sport->port.icount.rx += w_bytes;
+ } else {
+ WARN_ON(rx_ring->head > sg_dma_len(sgl));
+ WARN_ON(rx_ring->head <= rx_ring->tail);
}
- tty_flip_buffer_push(port);
- sport->port.icount.rx += count;
}
- /*
- * Restart RX DMA directly if more data is available in order to skip
- * the roundtrip through the IRQ handler. If there is some data already
- * in the FIFO, DMA needs to be restarted soon anyways.
- *
- * Otherwise stop the DMA and reactivate FIFO IRQs to restart DMA once
- * data starts to arrive again.
- */
- if (readl(sport->port.membase + USR2) & USR2_RDR)
- start_rx_dma(sport);
- else
- imx_rx_dma_done(sport);
+ if (w_bytes) {
+ tty_flip_buffer_push(port);
+ dev_dbg(sport->port.dev, "We get %d bytes.\n", w_bytes);
+ }
}
+/* RX DMA buffer periods */
+#define RX_DMA_PERIODS 4
+
static int start_rx_dma(struct imx_port *sport)
{
struct scatterlist *sgl = &sport->rx_sgl;
@@ -1017,14 +1028,21 @@ static int start_rx_dma(struct imx_port *sport)
struct dma_async_tx_descriptor *desc;
int ret;
+ sport->rx_ring.head = 0;
+ sport->rx_ring.tail = 0;
+ sport->rx_periods = RX_DMA_PERIODS;
+
sg_init_one(sgl, sport->rx_buf, RX_BUF_SIZE);
ret = dma_map_sg(dev, sgl, 1, DMA_FROM_DEVICE);
if (ret == 0) {
dev_err(dev, "DMA mapping error for RX.\n");
return -EINVAL;
}
- desc = dmaengine_prep_slave_sg(chan, sgl, 1, DMA_DEV_TO_MEM,
- DMA_PREP_INTERRUPT);
+
+ desc = dmaengine_prep_dma_cyclic(chan, sg_dma_address(sgl),
+ sg_dma_len(sgl), sg_dma_len(sgl) / sport->rx_periods,
+ DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
+
if (!desc) {
dma_unmap_sg(dev, sgl, 1, DMA_FROM_DEVICE);
dev_err(dev, "We cannot prepare for the RX slave dma!\n");
@@ -1034,7 +1052,7 @@ static int start_rx_dma(struct imx_port *sport)
desc->callback_param = sport;
dev_dbg(dev, "RX: prepare for the DMA.\n");
- dmaengine_submit(desc);
+ sport->rx_cookie = dmaengine_submit(desc);
dma_async_issue_pending(chan);
return 0;
}
@@ -1058,14 +1076,16 @@ static void imx_setup_ufcr(struct imx_port *sport,
static void imx_uart_dma_exit(struct imx_port *sport)
{
if (sport->dma_chan_rx) {
+ dmaengine_terminate_all(sport->dma_chan_rx);
dma_release_channel(sport->dma_chan_rx);
sport->dma_chan_rx = NULL;
-
+ sport->rx_cookie = -EINVAL;
kfree(sport->rx_buf);
sport->rx_buf = NULL;
}
if (sport->dma_chan_tx) {
+ dmaengine_terminate_all(sport->dma_chan_tx);
dma_release_channel(sport->dma_chan_tx);
sport->dma_chan_tx = NULL;
}
@@ -1103,6 +1123,7 @@ static int imx_uart_dma_init(struct imx_port *sport)
ret = -ENOMEM;
goto err;
}
+ sport->rx_ring.buf = sport->rx_buf;
/* Prepare for TX : */
sport->dma_chan_tx = dma_request_slave_channel(dev, "tx");
@@ -1283,17 +1304,11 @@ static void imx_shutdown(struct uart_port *port)
unsigned long flags;
if (sport->dma_is_enabled) {
- int ret;
+ sport->dma_is_rxing = 0;
+ sport->dma_is_txing = 0;
+ dmaengine_terminate_all(sport->dma_chan_tx);
+ dmaengine_terminate_all(sport->dma_chan_rx);
- /* We have to wait for the DMA to finish. */
- ret = wait_event_interruptible(sport->dma_wait,
- !sport->dma_is_rxing && !sport->dma_is_txing);
- if (ret != 0) {
- sport->dma_is_rxing = 0;
- sport->dma_is_txing = 0;
- dmaengine_terminate_all(sport->dma_chan_tx);
- dmaengine_terminate_all(sport->dma_chan_rx);
- }
spin_lock_irqsave(&sport->port.lock, flags);
imx_stop_tx(port);
imx_stop_rx(port);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-11 12:54:42 +0000