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Date: Tue, 20 Sep 2022 09:58:44 +0200
From: Jiri Slaby <jslaby@...e.cz>
To: gregkh@...uxfoundation.org
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
Jiri Slaby <jslaby@...e.cz>,
Russell King <linux@...linux.org.uk>,
Florian Fainelli <f.fainelli@...il.com>,
bcm-kernel-feedback-list@...adcom.com,
Pali Rohár <pali@...nel.org>,
Kevin Cernekee <cernekee@...il.com>,
Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Orson Zhai <orsonzhai@...il.com>,
Baolin Wang <baolin.wang7@...il.com>,
Chunyan Zhang <zhang.lyra@...il.com>,
Patrice Chotard <patrice.chotard@...s.st.com>,
linux-riscv@...ts.infradead.org
Subject: [PATCH v4 10/10] tty: serial: use uart_port_tx_limited()
uart_port_tx_limited() is a new helper to send characters to the device.
Use it in these drivers.
mux.c also needs to define tx_done(). But I'm not sure if the driver
really wants to wait for all the characters to dismiss from the HW fifo
at this code point. Hence I marked this as FIXME.
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Russell King <linux@...linux.org.uk>
Cc: Florian Fainelli <f.fainelli@...il.com>
Cc: bcm-kernel-feedback-list@...adcom.com
Cc: "Pali Rohár" <pali@...nel.org>
Cc: Kevin Cernekee <cernekee@...il.com>
Cc: Palmer Dabbelt <palmer@...belt.com>
Cc: Paul Walmsley <paul.walmsley@...ive.com>
Cc: Orson Zhai <orsonzhai@...il.com>
Cc: Baolin Wang <baolin.wang7@...il.com>
Cc: Chunyan Zhang <zhang.lyra@...il.com>
Cc: Patrice Chotard <patrice.chotard@...s.st.com>
Cc: linux-riscv@...ts.infradead.org
---
Notes:
[v4] switch from DEFINE_UART_PORT_TX_HELPER_LIMITED() (helper generator)
to uart_port_tx_limited() (akin to wait_event())
drivers/tty/serial/21285.c | 32 +++----------------
drivers/tty/serial/altera_jtaguart.c | 40 ++++++-----------------
drivers/tty/serial/amba-pl010.c | 32 +++----------------
drivers/tty/serial/apbuart.c | 34 +++-----------------
drivers/tty/serial/bcm63xx_uart.c | 47 ++++++---------------------
drivers/tty/serial/mux.c | 45 ++++++++------------------
drivers/tty/serial/mvebu-uart.c | 38 +++-------------------
drivers/tty/serial/omap-serial.c | 32 +++----------------
drivers/tty/serial/pxa.c | 33 +++----------------
drivers/tty/serial/rp2.c | 31 ++++--------------
drivers/tty/serial/serial_txx9.c | 32 +++----------------
drivers/tty/serial/sifive.c | 31 +++---------------
drivers/tty/serial/sprd_serial.c | 33 +++----------------
drivers/tty/serial/st-asc.c | 48 +++-------------------------
14 files changed, 87 insertions(+), 421 deletions(-)
diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c
index 2f17bf4b221e..84c1e3e365c8 100644
--- a/drivers/tty/serial/21285.c
+++ b/drivers/tty/serial/21285.c
@@ -154,35 +154,13 @@ static irqreturn_t serial21285_rx_chars(int irq, void *dev_id)
static irqreturn_t serial21285_tx_chars(int irq, void *dev_id)
{
struct uart_port *port = dev_id;
- struct circ_buf *xmit = &port->state->xmit;
- int count = 256;
-
- if (port->x_char) {
- *CSR_UARTDR = port->x_char;
- port->icount.tx++;
- port->x_char = 0;
- goto out;
- }
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- serial21285_stop_tx(port);
- goto out;
- }
-
- do {
- *CSR_UARTDR = xmit->buf[xmit->tail];
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (--count > 0 && !(*CSR_UARTFLG & 0x20));
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
+ u8 ch;
- if (uart_circ_empty(xmit))
- serial21285_stop_tx(port);
+ uart_port_tx_limited(port, ch, 256,
+ !(*CSR_UARTFLG & 0x20),
+ *CSR_UARTDR = ch,
+ ({}));
- out:
return IRQ_HANDLED;
}
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index 23f339757894..f224f5141726 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -137,39 +137,17 @@ static void altera_jtaguart_rx_chars(struct altera_jtaguart *pp)
static void altera_jtaguart_tx_chars(struct altera_jtaguart *pp)
{
struct uart_port *port = &pp->port;
- struct circ_buf *xmit = &port->state->xmit;
- unsigned int pending, count;
-
- if (port->x_char) {
- /* Send special char - probably flow control */
- writel(port->x_char, port->membase + ALTERA_JTAGUART_DATA_REG);
- port->x_char = 0;
- port->icount.tx++;
- return;
- }
+ unsigned int space;
+ u8 ch;
- pending = uart_circ_chars_pending(xmit);
- if (pending > 0) {
- count = (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) &
- ALTERA_JTAGUART_CONTROL_WSPACE_MSK) >>
- ALTERA_JTAGUART_CONTROL_WSPACE_OFF;
- if (count > pending)
- count = pending;
- if (count > 0) {
- pending -= count;
- while (count--) {
- writel(xmit->buf[xmit->tail],
- port->membase + ALTERA_JTAGUART_DATA_REG);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- }
- if (pending < WAKEUP_CHARS)
- uart_write_wakeup(port);
- }
- }
+ space = readl(port->membase + ALTERA_JTAGUART_CONTROL_REG);
+ space &= ALTERA_JTAGUART_CONTROL_WSPACE_MSK;
+ space >>= ALTERA_JTAGUART_CONTROL_WSPACE_OFF;
- if (pending == 0)
- altera_jtaguart_stop_tx(port);
+ uart_port_tx_limited(port, ch, space,
+ true,
+ writel(ch, port->membase + ALTERA_JTAGUART_DATA_REG),
+ ({}));
}
static irqreturn_t altera_jtaguart_interrupt(int irq, void *data)
diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
index af27fb8ec145..a98fae2ca422 100644
--- a/drivers/tty/serial/amba-pl010.c
+++ b/drivers/tty/serial/amba-pl010.c
@@ -164,34 +164,12 @@ static void pl010_rx_chars(struct uart_port *port)
static void pl010_tx_chars(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
- int count;
+ u8 ch;
- if (port->x_char) {
- writel(port->x_char, port->membase + UART01x_DR);
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- pl010_stop_tx(port);
- return;
- }
-
- count = port->fifosize >> 1;
- do {
- writel(xmit->buf[xmit->tail], port->membase + UART01x_DR);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (--count > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- if (uart_circ_empty(xmit))
- pl010_stop_tx(port);
+ uart_port_tx_limited(port, ch, port->fifosize >> 1,
+ true,
+ writel(ch, port->membase + UART01x_DR),
+ ({}));
}
static void pl010_modem_status(struct uart_amba_port *uap)
diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
index 450f4edfda0f..915ee4b0d594 100644
--- a/drivers/tty/serial/apbuart.c
+++ b/drivers/tty/serial/apbuart.c
@@ -122,36 +122,12 @@ static void apbuart_rx_chars(struct uart_port *port)
static void apbuart_tx_chars(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
- int count;
-
- if (port->x_char) {
- UART_PUT_CHAR(port, port->x_char);
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- apbuart_stop_tx(port);
- return;
- }
-
- /* amba: fill FIFO */
- count = port->fifosize >> 1;
- do {
- UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (--count > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
+ u8 ch;
- if (uart_circ_empty(xmit))
- apbuart_stop_tx(port);
+ uart_port_tx_limited(port, ch, port->fifosize >> 1,
+ true,
+ UART_PUT_CHAR(port, ch),
+ ({}));
}
static irqreturn_t apbuart_int(int irq, void *dev_id)
diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
index 5d9737c2d1f2..62bc7244dc67 100644
--- a/drivers/tty/serial/bcm63xx_uart.c
+++ b/drivers/tty/serial/bcm63xx_uart.c
@@ -303,53 +303,24 @@ static void bcm_uart_do_rx(struct uart_port *port)
*/
static void bcm_uart_do_tx(struct uart_port *port)
{
- struct circ_buf *xmit;
- unsigned int val, max_count;
-
- if (port->x_char) {
- bcm_uart_writel(port, port->x_char, UART_FIFO_REG);
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
-
- if (uart_tx_stopped(port)) {
- bcm_uart_stop_tx(port);
- return;
- }
-
- xmit = &port->state->xmit;
- if (uart_circ_empty(xmit))
- goto txq_empty;
+ unsigned int val;
+ bool pending;
+ u8 ch;
val = bcm_uart_readl(port, UART_MCTL_REG);
val = (val & UART_MCTL_TXFIFOFILL_MASK) >> UART_MCTL_TXFIFOFILL_SHIFT;
- max_count = port->fifosize - val;
-
- while (max_count--) {
- unsigned int c;
- c = xmit->buf[xmit->tail];
- bcm_uart_writel(port, c, UART_FIFO_REG);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- }
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- if (uart_circ_empty(xmit))
- goto txq_empty;
- return;
+ pending = uart_port_tx_limited(port, ch, port->fifosize - val,
+ true,
+ bcm_uart_writel(port, ch, UART_FIFO_REG),
+ ({}));
+ if (pending)
+ return;
-txq_empty:
/* nothing to send, disable transmit interrupt */
val = bcm_uart_readl(port, UART_IR_REG);
val &= ~UART_TX_INT_MASK;
bcm_uart_writel(port, val, UART_IR_REG);
- return;
}
/*
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index ed0e763f622a..85ce1e9af44a 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -171,6 +171,13 @@ static void mux_break_ctl(struct uart_port *port, int break_state)
{
}
+static void mux_tx_done(struct uart_port *port)
+{
+ /* FIXME js: really needs to wait? */
+ while (UART_GET_FIFO_CNT(port))
+ udelay(1);
+}
+
/**
* mux_write - Write chars to the mux fifo.
* @port: Ptr to the uart_port.
@@ -180,39 +187,13 @@ static void mux_break_ctl(struct uart_port *port, int break_state)
*/
static void mux_write(struct uart_port *port)
{
- int count;
- struct circ_buf *xmit = &port->state->xmit;
-
- if(port->x_char) {
- UART_PUT_CHAR(port, port->x_char);
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
-
- if(uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- mux_stop_tx(port);
- return;
- }
-
- count = (port->fifosize) - UART_GET_FIFO_CNT(port);
- do {
- UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if(uart_circ_empty(xmit))
- break;
-
- } while(--count > 0);
-
- while(UART_GET_FIFO_CNT(port))
- udelay(1);
-
- if(uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
+ u8 ch;
- if (uart_circ_empty(xmit))
- mux_stop_tx(port);
+ uart_port_tx_limited(port, ch,
+ port->fifosize - UART_GET_FIFO_CNT(port),
+ true,
+ UART_PUT_CHAR(port, ch),
+ mux_tx_done(port));
}
/**
diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
index ba16e1da6bd3..7b566404cb33 100644
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -335,40 +335,12 @@ static void mvebu_uart_rx_chars(struct uart_port *port, unsigned int status)
static void mvebu_uart_tx_chars(struct uart_port *port, unsigned int status)
{
- struct circ_buf *xmit = &port->state->xmit;
- unsigned int count;
- unsigned int st;
-
- if (port->x_char) {
- writel(port->x_char, port->membase + UART_TSH(port));
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- mvebu_uart_stop_tx(port);
- return;
- }
-
- for (count = 0; count < port->fifosize; count++) {
- writel(xmit->buf[xmit->tail], port->membase + UART_TSH(port));
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
-
- if (uart_circ_empty(xmit))
- break;
-
- st = readl(port->membase + UART_STAT);
- if (st & STAT_TX_FIFO_FUL)
- break;
- }
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
+ u8 ch;
- if (uart_circ_empty(xmit))
- mvebu_uart_stop_tx(port);
+ uart_port_tx_limited(port, ch, port->fifosize,
+ !(readl(port->membase + UART_STAT) & STAT_TX_FIFO_FUL),
+ writel(ch, port->membase + UART_TSH(port)),
+ ({}));
}
static irqreturn_t mvebu_uart_isr(int irq, void *dev_id)
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index b7b76e49115e..ccea746e1214 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -348,34 +348,12 @@ static void serial_omap_put_char(struct uart_omap_port *up, unsigned char ch)
static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
{
- struct circ_buf *xmit = &up->port.state->xmit;
- int count;
+ u8 ch;
- if (up->port.x_char) {
- serial_omap_put_char(up, up->port.x_char);
- up->port.icount.tx++;
- up->port.x_char = 0;
- return;
- }
- if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
- serial_omap_stop_tx(&up->port);
- return;
- }
- count = up->port.fifosize / 4;
- do {
- serial_omap_put_char(up, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- up->port.icount.tx++;
-
- if (uart_circ_empty(xmit))
- break;
- } while (--count > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&up->port);
-
- if (uart_circ_empty(xmit))
- serial_omap_stop_tx(&up->port);
+ uart_port_tx_limited(&up->port, ch, up->port.fifosize / 4,
+ true,
+ serial_omap_put_char(up, ch),
+ ({}));
}
static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index 2d25231fad84..444fa4b654ac 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -174,35 +174,12 @@ static inline void receive_chars(struct uart_pxa_port *up, int *status)
static void transmit_chars(struct uart_pxa_port *up)
{
- struct circ_buf *xmit = &up->port.state->xmit;
- int count;
+ u8 ch;
- if (up->port.x_char) {
- serial_out(up, UART_TX, up->port.x_char);
- up->port.icount.tx++;
- up->port.x_char = 0;
- return;
- }
- if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
- serial_pxa_stop_tx(&up->port);
- return;
- }
-
- count = up->port.fifosize / 2;
- do {
- serial_out(up, UART_TX, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- up->port.icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (--count > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&up->port);
-
-
- if (uart_circ_empty(xmit))
- serial_pxa_stop_tx(&up->port);
+ uart_port_tx_limited(&up->port, ch, up->port.fifosize / 2,
+ true,
+ serial_out(up, UART_TX, ch),
+ ({}));
}
static void serial_pxa_start_tx(struct uart_port *port)
diff --git a/drivers/tty/serial/rp2.c b/drivers/tty/serial/rp2.c
index b81afb06f1f4..749b873a5d99 100644
--- a/drivers/tty/serial/rp2.c
+++ b/drivers/tty/serial/rp2.c
@@ -427,32 +427,13 @@ static void rp2_rx_chars(struct rp2_uart_port *up)
static void rp2_tx_chars(struct rp2_uart_port *up)
{
- u16 max_tx = FIFO_SIZE - readw(up->base + RP2_TX_FIFO_COUNT);
- struct circ_buf *xmit = &up->port.state->xmit;
+ u8 ch;
- if (uart_tx_stopped(&up->port)) {
- rp2_uart_stop_tx(&up->port);
- return;
- }
-
- for (; max_tx != 0; max_tx--) {
- if (up->port.x_char) {
- writeb(up->port.x_char, up->base + RP2_DATA_BYTE);
- up->port.x_char = 0;
- up->port.icount.tx++;
- continue;
- }
- if (uart_circ_empty(xmit)) {
- rp2_uart_stop_tx(&up->port);
- break;
- }
- writeb(xmit->buf[xmit->tail], up->base + RP2_DATA_BYTE);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- up->port.icount.tx++;
- }
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&up->port);
+ uart_port_tx_limited(&up->port, ch,
+ FIFO_SIZE - readw(up->base + RP2_TX_FIFO_COUNT),
+ true,
+ writeb(ch, up->base + RP2_DATA_BYTE),
+ ({}));
}
static void rp2_ch_interrupt(struct rp2_uart_port *up)
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index e12f1dc18c38..eab387b01e36 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -321,34 +321,12 @@ receive_chars(struct uart_port *up, unsigned int *status)
static inline void transmit_chars(struct uart_port *up)
{
- struct circ_buf *xmit = &up->state->xmit;
- int count;
+ u8 ch;
- if (up->x_char) {
- sio_out(up, TXX9_SITFIFO, up->x_char);
- up->icount.tx++;
- up->x_char = 0;
- return;
- }
- if (uart_circ_empty(xmit) || uart_tx_stopped(up)) {
- serial_txx9_stop_tx(up);
- return;
- }
-
- count = TXX9_SIO_TX_FIFO;
- do {
- sio_out(up, TXX9_SITFIFO, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- up->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (--count > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(up);
-
- if (uart_circ_empty(xmit))
- serial_txx9_stop_tx(up);
+ uart_port_tx_limited(up, ch, TXX9_SIO_TX_FIFO,
+ true,
+ sio_out(up, TXX9_SITFIFO, ch),
+ ({}));
}
static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c
index 4761f172103a..64cfd455f556 100644
--- a/drivers/tty/serial/sifive.c
+++ b/drivers/tty/serial/sifive.c
@@ -288,33 +288,12 @@ static void __ssp_transmit_char(struct sifive_serial_port *ssp, int ch)
*/
static void __ssp_transmit_chars(struct sifive_serial_port *ssp)
{
- struct circ_buf *xmit = &ssp->port.state->xmit;
- int count;
-
- if (ssp->port.x_char) {
- __ssp_transmit_char(ssp, ssp->port.x_char);
- ssp->port.icount.tx++;
- ssp->port.x_char = 0;
- return;
- }
- if (uart_circ_empty(xmit) || uart_tx_stopped(&ssp->port)) {
- sifive_serial_stop_tx(&ssp->port);
- return;
- }
- count = SIFIVE_TX_FIFO_DEPTH;
- do {
- __ssp_transmit_char(ssp, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- ssp->port.icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (--count > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&ssp->port);
+ u8 ch;
- if (uart_circ_empty(xmit))
- sifive_serial_stop_tx(&ssp->port);
+ uart_port_tx_limited(&ssp->port, ch, SIFIVE_TX_FIFO_DEPTH,
+ true,
+ __ssp_transmit_char(ssp, ch),
+ ({}));
}
/**
diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
index 342a87967631..3f34f7bb7700 100644
--- a/drivers/tty/serial/sprd_serial.c
+++ b/drivers/tty/serial/sprd_serial.c
@@ -626,35 +626,12 @@ static inline void sprd_rx(struct uart_port *port)
static inline void sprd_tx(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
- int count;
-
- if (port->x_char) {
- serial_out(port, SPRD_TXD, port->x_char);
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- sprd_stop_tx(port);
- return;
- }
-
- count = THLD_TX_EMPTY;
- do {
- serial_out(port, SPRD_TXD, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (--count > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
+ u8 ch;
- if (uart_circ_empty(xmit))
- sprd_stop_tx(port);
+ uart_port_tx_limited(port, ch, THLD_TX_EMPTY,
+ true,
+ serial_out(port, SPRD_TXD, ch),
+ ({}));
}
/* this handles the interrupt from one port */
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index fcecea689a0d..5215e6910f68 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -237,50 +237,12 @@ static inline unsigned asc_hw_txroom(struct uart_port *port)
*/
static void asc_transmit_chars(struct uart_port *port)
{
- struct circ_buf *xmit = &port->state->xmit;
- int txroom;
- unsigned char c;
-
- txroom = asc_hw_txroom(port);
-
- if ((txroom != 0) && port->x_char) {
- c = port->x_char;
- port->x_char = 0;
- asc_out(port, ASC_TXBUF, c);
- port->icount.tx++;
- txroom = asc_hw_txroom(port);
- }
-
- if (uart_tx_stopped(port)) {
- /*
- * We should try and stop the hardware here, but I
- * don't think the ASC has any way to do that.
- */
- asc_disable_tx_interrupts(port);
- return;
- }
-
- if (uart_circ_empty(xmit)) {
- asc_disable_tx_interrupts(port);
- return;
- }
-
- if (txroom == 0)
- return;
-
- do {
- c = xmit->buf[xmit->tail];
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- asc_out(port, ASC_TXBUF, c);
- port->icount.tx++;
- txroom--;
- } while ((txroom > 0) && (!uart_circ_empty(xmit)));
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
+ u8 ch;
- if (uart_circ_empty(xmit))
- asc_disable_tx_interrupts(port);
+ uart_port_tx_limited(port, ch, asc_hw_txroom(port),
+ true,
+ asc_out(port, ASC_TXBUF, ch),
+ ({}));
}
static void asc_receive_chars(struct uart_port *port)
--
2.37.3
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