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path: root/drivers/tty/serial/serial-tegra.c
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Diffstat (limited to 'drivers/tty/serial/serial-tegra.c')
-rw-r--r--drivers/tty/serial/serial-tegra.c94
1 files changed, 28 insertions, 66 deletions
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index cf0133ae7..1d6fc60ed 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -186,7 +186,6 @@ static void set_rts(struct tegra_uart_port *tup, bool active)
tegra_uart_write(tup, mcr, UART_MCR);
tup->mcr_shadow = mcr;
}
- return;
}
static void set_dtr(struct tegra_uart_port *tup, bool active)
@@ -202,7 +201,6 @@ static void set_dtr(struct tegra_uart_port *tup, bool active)
tegra_uart_write(tup, mcr, UART_MCR);
tup->mcr_shadow = mcr;
}
- return;
}
static void tegra_uart_set_mctrl(struct uart_port *u, unsigned int mctrl)
@@ -217,7 +215,6 @@ static void tegra_uart_set_mctrl(struct uart_port *u, unsigned int mctrl)
dtr_enable = !!(mctrl & TIOCM_DTR);
set_dtr(tup, dtr_enable);
- return;
}
static void tegra_uart_break_ctl(struct uart_port *u, int break_ctl)
@@ -511,7 +508,6 @@ static void tegra_uart_stop_tx(struct uart_port *u)
async_tx_ack(tup->tx_dma_desc);
xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
tup->tx_in_progress = 0;
- return;
}
static void tegra_uart_handle_tx_pio(struct tegra_uart_port *tup)
@@ -523,7 +519,6 @@ static void tegra_uart_handle_tx_pio(struct tegra_uart_port *tup)
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&tup->uport);
tegra_uart_start_next_tx(tup);
- return;
}
static void tegra_uart_handle_rx_pio(struct tegra_uart_port *tup,
@@ -545,8 +540,6 @@ static void tegra_uart_handle_rx_pio(struct tegra_uart_port *tup,
if (!uart_handle_sysrq_char(&tup->uport, ch) && tty)
tty_insert_flip_char(tty, ch, flag);
} while (1);
-
- return;
}
static void tegra_uart_copy_rx_to_tty(struct tegra_uart_port *tup,
@@ -576,13 +569,30 @@ static void tegra_uart_copy_rx_to_tty(struct tegra_uart_port *tup,
TEGRA_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE);
}
+static void tegra_uart_rx_buffer_push(struct tegra_uart_port *tup,
+ unsigned int residue)
+{
+ struct tty_port *port = &tup->uport.state->port;
+ struct tty_struct *tty = tty_port_tty_get(port);
+ unsigned int count;
+
+ async_tx_ack(tup->rx_dma_desc);
+ count = tup->rx_bytes_requested - residue;
+
+ /* If we are here, DMA is stopped */
+ tegra_uart_copy_rx_to_tty(tup, port, count);
+
+ tegra_uart_handle_rx_pio(tup, port);
+ if (tty) {
+ tty_flip_buffer_push(port);
+ tty_kref_put(tty);
+ }
+}
+
static void tegra_uart_rx_dma_complete(void *args)
{
struct tegra_uart_port *tup = args;
struct uart_port *u = &tup->uport;
- unsigned int count = tup->rx_bytes_requested;
- struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port);
- struct tty_port *port = &u->state->port;
unsigned long flags;
struct dma_tx_state state;
enum dma_status status;
@@ -596,22 +606,11 @@ static void tegra_uart_rx_dma_complete(void *args)
goto done;
}
- async_tx_ack(tup->rx_dma_desc);
-
/* Deactivate flow control to stop sender */
if (tup->rts_active)
set_rts(tup, false);
- /* If we are here, DMA is stopped */
- tegra_uart_copy_rx_to_tty(tup, port, count);
-
- tegra_uart_handle_rx_pio(tup, port);
- if (tty) {
- spin_unlock_irqrestore(&u->lock, flags);
- tty_flip_buffer_push(port);
- spin_lock_irqsave(&u->lock, flags);
- tty_kref_put(tty);
- }
+ tegra_uart_rx_buffer_push(tup, 0);
tegra_uart_start_rx_dma(tup);
/* Activate flow control to start transfer */
@@ -622,34 +621,17 @@ done:
spin_unlock_irqrestore(&u->lock, flags);
}
-static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup,
- unsigned long *flags)
+static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup)
{
struct dma_tx_state state;
- struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port);
- struct tty_port *port = &tup->uport.state->port;
- struct uart_port *u = &tup->uport;
- unsigned int count;
/* Deactivate flow control to stop sender */
if (tup->rts_active)
set_rts(tup, false);
dmaengine_terminate_all(tup->rx_dma_chan);
- dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state);
- async_tx_ack(tup->rx_dma_desc);
- count = tup->rx_bytes_requested - state.residue;
-
- /* If we are here, DMA is stopped */
- tegra_uart_copy_rx_to_tty(tup, port, count);
-
- tegra_uart_handle_rx_pio(tup, port);
- if (tty) {
- spin_unlock_irqrestore(&u->lock, *flags);
- tty_flip_buffer_push(port);
- spin_lock_irqsave(&u->lock, *flags);
- tty_kref_put(tty);
- }
+ dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state);
+ tegra_uart_rx_buffer_push(tup, state.residue);
tegra_uart_start_rx_dma(tup);
if (tup->rts_active)
@@ -697,7 +679,6 @@ static void tegra_uart_handle_modem_signal_change(struct uart_port *u)
/* Will start/stop_tx accordingly */
if (msr & UART_MSR_DCTS)
uart_handle_cts_change(&tup->uport, msr & UART_MSR_CTS);
- return;
}
static irqreturn_t tegra_uart_isr(int irq, void *data)
@@ -714,7 +695,7 @@ static irqreturn_t tegra_uart_isr(int irq, void *data)
iir = tegra_uart_read(tup, UART_IIR);
if (iir & UART_IIR_NO_INT) {
if (is_rx_int) {
- tegra_uart_handle_rx_dma(tup, &flags);
+ tegra_uart_handle_rx_dma(tup);
if (tup->rx_in_progress) {
ier = tup->ier_shadow;
ier |= (UART_IER_RLSI | UART_IER_RTOIE |
@@ -769,11 +750,8 @@ static irqreturn_t tegra_uart_isr(int irq, void *data)
static void tegra_uart_stop_rx(struct uart_port *u)
{
struct tegra_uart_port *tup = to_tegra_uport(u);
- struct tty_struct *tty;
- struct tty_port *port = &u->state->port;
struct dma_tx_state state;
unsigned long ier;
- int count;
if (tup->rts_active)
set_rts(tup, false);
@@ -781,8 +759,6 @@ static void tegra_uart_stop_rx(struct uart_port *u)
if (!tup->rx_in_progress)
return;
- tty = tty_port_tty_get(&tup->uport.state->port);
-
tegra_uart_wait_sym_time(tup, 1); /* wait a character interval */
ier = tup->ier_shadow;
@@ -791,21 +767,9 @@ static void tegra_uart_stop_rx(struct uart_port *u)
tup->ier_shadow = ier;
tegra_uart_write(tup, ier, UART_IER);
tup->rx_in_progress = 0;
- if (tup->rx_dma_chan) {
- dmaengine_terminate_all(tup->rx_dma_chan);
- dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state);
- async_tx_ack(tup->rx_dma_desc);
- count = tup->rx_bytes_requested - state.residue;
- tegra_uart_copy_rx_to_tty(tup, port, count);
- tegra_uart_handle_rx_pio(tup, port);
- } else {
- tegra_uart_handle_rx_pio(tup, port);
- }
- if (tty) {
- tty_flip_buffer_push(port);
- tty_kref_put(tty);
- }
- return;
+ dmaengine_terminate_all(tup->rx_dma_chan);
+ dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state);
+ tegra_uart_rx_buffer_push(tup, state.residue);
}
static void tegra_uart_hw_deinit(struct tegra_uart_port *tup)
@@ -1083,7 +1047,6 @@ static void tegra_uart_flush_buffer(struct uart_port *u)
tup->tx_bytes = 0;
if (tup->tx_dma_chan)
dmaengine_terminate_all(tup->tx_dma_chan);
- return;
}
static void tegra_uart_shutdown(struct uart_port *u)
@@ -1223,7 +1186,6 @@ static void tegra_uart_set_termios(struct uart_port *u,
tegra_uart_read(tup, UART_IER);
spin_unlock_irqrestore(&u->lock, flags);
- return;
}
static const char *tegra_uart_type(struct uart_port *u)