uart_port_tx_limit() is a new helper to send characters to the device.
Use it in these drivers.
It means we have to define two new uart hooks: tx_ready() and put_char()
to do the real job now.
And 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@xxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: bcm-kernel-feedback-list@xxxxxxxxxxxx
Cc: "Pali Rohár" <pali@xxxxxxxxxx>
Cc: Kevin Cernekee <cernekee@xxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Cc: Orson Zhai <orsonzhai@xxxxxxxxx>
Cc: Baolin Wang <baolin.wang7@xxxxxxxxx>
Cc: Chunyan Zhang <zhang.lyra@xxxxxxxxx>
Cc: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>
Cc: linux-riscv@xxxxxxxxxxxxxxxxxxx
---
drivers/tty/serial/21285.c | 40 +++++++--------------
drivers/tty/serial/altera_jtaguart.c | 43 ++++++----------------
drivers/tty/serial/amba-pl010.c | 40 ++++-----------------
drivers/tty/serial/apbuart.c | 37 ++++---------------
drivers/tty/serial/bcm63xx_uart.c | 48 ++++++-------------------
drivers/tty/serial/mux.c | 48 ++++++++-----------------
drivers/tty/serial/mvebu-uart.c | 47 +++++++-----------------
drivers/tty/serial/omap-serial.c | 53 +++++++---------------------
drivers/tty/serial/pxa.c | 43 +++++-----------------
drivers/tty/serial/rp2.c | 36 ++++++-------------
drivers/tty/serial/serial_txx9.c | 40 ++++-----------------
drivers/tty/serial/sifive.c | 48 ++++---------------------
drivers/tty/serial/sprd_serial.c | 41 ++++-----------------
drivers/tty/serial/st-asc.c | 51 ++++----------------------
drivers/tty/serial/vr41xx_siu.c | 42 ++++------------------
15 files changed, 143 insertions(+), 514 deletions(-)
diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c
index 7520cc02fd4d..12d9bdcd67b8 100644
--- a/drivers/tty/serial/21285.c
+++ b/drivers/tty/serial/21285.c
@@ -154,35 +154,9 @@ 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);
- if (uart_circ_empty(xmit))
- serial21285_stop_tx(port);
+ uart_port_tx_limit(port, 256);
- out:
return IRQ_HANDLED;
}
@@ -191,6 +165,16 @@ static unsigned int serial21285_tx_empty(struct uart_port *port)
return (*CSR_UARTFLG & 8) ? 0 : TIOCSER_TEMT;
}
+static bool serial21285_uart_tx_ready(struct uart_port *port)
+{
+ return !(*CSR_UARTFLG & 0x20);
+}
+
+static void serial21285_put_char(struct uart_port *port, unsigned char ch)
+{
+ *CSR_UARTDR = ch;
+}
+
/* no modem control lines */
static unsigned int serial21285_get_mctrl(struct uart_port *port)
{
@@ -372,6 +356,8 @@ static int serial21285_verify_port(struct uart_port *port, struct serial_struct
static const struct uart_ops serial21285_ops = {
.tx_empty = serial21285_tx_empty,
+ .tx_ready = serial21285_uart_tx_ready,
+ .put_char = serial21285_put_char,
.get_mctrl = serial21285_get_mctrl,
.set_mctrl = serial21285_set_mctrl,
.stop_tx = serial21285_stop_tx,
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index cb791c5149a3..144cb4ab337b 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -65,6 +65,11 @@ static unsigned int altera_jtaguart_tx_empty(struct uart_port *port)
ALTERA_JTAGUART_CONTROL_WSPACE_MSK) ? TIOCSER_TEMT : 0;
}
+static void altera_jtaguart_put_char(struct uart_port *port, unsigned char ch)
+{
+ writel(ch, port->membase + ALTERA_JTAGUART_DATA_REG);
+}
+
static unsigned int altera_jtaguart_get_mctrl(struct uart_port *port)
{
return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
@@ -137,39 +142,12 @@ 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;
- }
-
- 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);
- }
- }
+ unsigned int space;
- if (pending == 0)
- altera_jtaguart_stop_tx(port);
+ space = (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) &
+ ALTERA_JTAGUART_CONTROL_WSPACE_MSK) >>
+ ALTERA_JTAGUART_CONTROL_WSPACE_OFF;
+ uart_port_tx_limit(port, space);
}
static irqreturn_t altera_jtaguart_interrupt(int irq, void *data)
@@ -274,6 +252,7 @@ static int altera_jtaguart_verify_port(struct uart_port *port,
*/
static const struct uart_ops altera_jtaguart_ops = {
.tx_empty = altera_jtaguart_tx_empty,
+ .put_char = altera_jtaguart_put_char,
.get_mctrl = altera_jtaguart_get_mctrl,
.set_mctrl = altera_jtaguart_set_mctrl,
.start_tx = altera_jtaguart_start_tx,
diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
index fae0b581ff42..1d73e1ba318b 100644
--- a/drivers/tty/serial/amba-pl010.c
+++ b/drivers/tty/serial/amba-pl010.c
@@ -162,38 +162,6 @@ static void pl010_rx_chars(struct uart_port *port)
tty_flip_buffer_push(&port->state->port);
}
-static void pl010_tx_chars(struct uart_port *port)
-{
- struct circ_buf *xmit = &port->state->xmit;
- int count;
-
- 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);
-}
-
static void pl010_modem_status(struct uart_amba_port *uap)
{
struct uart_port *port = &uap->port;
@@ -238,7 +206,7 @@ static irqreturn_t pl010_int(int irq, void *dev_id)
if (status & UART010_IIR_MIS)
pl010_modem_status(uap);
if (status & UART010_IIR_TIS)
- pl010_tx_chars(port);
+ uart_port_tx_limit(port, port->fifosize >> 1);
if (pass_counter-- == 0)
break;
@@ -261,6 +229,11 @@ static unsigned int pl010_tx_empty(struct uart_port *port)
return status & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
}
+static void pl010_put_char(struct uart_port *port, unsigned char ch)
+{
+ writel(ch, port->membase + UART01x_DR);
+}
+
static unsigned int pl010_get_mctrl(struct uart_port *port)
{
unsigned int result = 0;
@@ -529,6 +502,7 @@ static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
static const struct uart_ops amba_pl010_pops = {
.tx_empty = pl010_tx_empty,
+ .put_char = pl010_put_char,
.set_mctrl = pl010_set_mctrl,
.get_mctrl = pl010_get_mctrl,
.stop_tx = pl010_stop_tx,
diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
index 9ef82d870ff2..a31bd5849c76 100644
--- a/drivers/tty/serial/apbuart.c
+++ b/drivers/tty/serial/apbuart.c
@@ -122,36 +122,7 @@ 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);
-
- if (uart_circ_empty(xmit))
- apbuart_stop_tx(port);
+ uart_port_tx_limit(port, port->fifosize >> 1);
}
static irqreturn_t apbuart_int(int irq, void *dev_id)
@@ -178,6 +149,11 @@ static unsigned int apbuart_tx_empty(struct uart_port *port)
return status & UART_STATUS_THE ? TIOCSER_TEMT : 0;
}
+static void apbuart_put_char(struct uart_port *port, unsigned char ch)
+{
+ UART_PUT_CHAR(port, ch);
+}
+
static unsigned int apbuart_get_mctrl(struct uart_port *port)
{
/* The GRLIB APBUART handles flow control in hardware */
@@ -322,6 +298,7 @@ static int apbuart_verify_port(struct uart_port *port,
static const struct uart_ops grlib_apbuart_ops = {
.tx_empty = apbuart_tx_empty,
+ .put_char = apbuart_put_char,
.set_mctrl = apbuart_set_mctrl,
.get_mctrl = apbuart_get_mctrl,
.stop_tx = apbuart_stop_tx,
diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
index 53b43174aa40..29f31286ff54 100644
--- a/drivers/tty/serial/bcm63xx_uart.c
+++ b/drivers/tty/serial/bcm63xx_uart.c
@@ -93,6 +93,11 @@ static unsigned int bcm_uart_tx_empty(struct uart_port *port)
return (val & UART_IR_STAT(UART_IR_TXEMPTY)) ? 1 : 0;
}
+static void bcm_uart_put_char(struct uart_port *port, unsigned char ch)
+{
+ bcm_uart_writel(port, ch, UART_FIFO_REG);
+}
+
/*
* serial core request to set RTS and DTR pin state and loopback mode
*/
@@ -303,53 +308,19 @@ 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, pending;
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_limit(port, port->fifosize - val);
+ 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;
}
/*
@@ -629,6 +600,7 @@ static int bcm_uart_verify_port(struct uart_port *port,
/* serial core callbacks */
static const struct uart_ops bcm_uart_ops = {
.tx_empty = bcm_uart_tx_empty,
+ .put_char = bcm_uart_put_char,
.get_mctrl = bcm_uart_get_mctrl,
.set_mctrl = bcm_uart_set_mctrl,
.start_tx = bcm_uart_start_tx,
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index 643dfbcc43f9..e86718788b49 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -106,6 +106,18 @@ static unsigned int mux_tx_empty(struct uart_port *port)
return UART_GET_FIFO_CNT(port) ? 0 : TIOCSER_TEMT;
}
+static void mux_put_char(struct uart_port *port, unsigned char ch)
+{
+ UART_PUT_CHAR(port, ch);
+}
+
+static void mux_tx_done(struct uart_port *port)
+{
+ /* FIXME js: really needs to wait? */
+ while (UART_GET_FIFO_CNT(port))
+ udelay(1);
+}
+
/**
* mux_set_mctrl - Set the current state of the modem control inputs.
* @ports: Ptr to the uart_port.
@@ -180,39 +192,7 @@ 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);
-
- if (uart_circ_empty(xmit))
- mux_stop_tx(port);
+ uart_port_tx_limit(port, port->fifosize - UART_GET_FIFO_CNT(port));
}
/**
@@ -421,6 +401,8 @@ static struct console mux_console = {
static const struct uart_ops mux_pops = {
.tx_empty = mux_tx_empty,
+ .put_char = mux_put_char,
+ .tx_done = mux_tx_done,
.set_mctrl = mux_set_mctrl,
.get_mctrl = mux_get_mctrl,
.stop_tx = mux_stop_tx,
diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
index 0429c2a54290..3d07ab9eb15e 100644
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -194,6 +194,16 @@ static unsigned int mvebu_uart_tx_empty(struct uart_port *port)
return (st & STAT_TX_EMP) ? TIOCSER_TEMT : 0;
}
+static bool mvebu_uart_tx_ready(struct uart_port *port)
+{
+ return !(readl(port->membase + UART_STAT) & STAT_TX_FIFO_FUL);
+}
+
+static void mvebu_uart_put_char(struct uart_port *port, unsigned char ch)
+{
+ writel(ch, port->membase + UART_TSH(port));
+}
+
static unsigned int mvebu_uart_get_mctrl(struct uart_port *port)
{
return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
@@ -324,40 +334,7 @@ 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);
-
- if (uart_circ_empty(xmit))
- mvebu_uart_stop_tx(port);
+ uart_port_tx_limit(port, port->fifosize);
}
static irqreturn_t mvebu_uart_isr(int irq, void *dev_id)
@@ -654,6 +631,8 @@ static void mvebu_uart_put_poll_char(struct uart_port *port, unsigned char c)
static const struct uart_ops mvebu_uart_ops = {
.tx_empty = mvebu_uart_tx_empty,
+ .tx_ready = mvebu_uart_tx_ready,
+ .put_char = mvebu_uart_put_char,
.set_mctrl = mvebu_uart_set_mctrl,
.get_mctrl = mvebu_uart_get_mctrl,
.stop_tx = mvebu_uart_stop_tx,
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 8d5ffa196097..a6446bef49f1 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -336,45 +336,6 @@ static void serial_omap_stop_rx(struct uart_port *port)
serial_out(up, UART_IER, up->ier);
}
-static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
-{
- struct circ_buf *xmit = &up->port.state->xmit;
- int count;
-
- if (up->port.x_char) {
- serial_out(up, UART_TX, up->port.x_char);
- up->port.icount.tx++;
- up->port.x_char = 0;
- if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
- !(up->port.rs485.flags & SER_RS485_RX_DURING_TX))
- up->rs485_tx_filter_count++;
-
- 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_out(up, UART_TX, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- up->port.icount.tx++;
- if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
- !(up->port.rs485.flags & SER_RS485_RX_DURING_TX))
- up->rs485_tx_filter_count++;
-
- 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);
-}
-
static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
{
if (!(up->ier & UART_IER_THRI)) {
@@ -572,7 +533,7 @@ static irqreturn_t serial_omap_irq(int irq, void *dev_id)
check_modem_status(up);
break;
case UART_IIR_THRI:
- transmit_chars(up, lsr);
+ uart_port_tx_limit(&up->port, up->port.fifosize / 4);
break;
case UART_IIR_RX_TIMEOUT:
case UART_IIR_RDI:
@@ -613,6 +574,17 @@ static unsigned int serial_omap_tx_empty(struct uart_port *port)
return ret;
}
+static void serial_omap_put_char(struct uart_port *port, unsigned char ch)
+{
+ struct uart_omap_port *up = to_uart_omap_port(port);
+
+ serial_out(up, UART_TX, ch);
+
+ if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
+ !(up->port.rs485.flags & SER_RS485_RX_DURING_TX))
+ up->rs485_tx_filter_count++;
+}
+
static unsigned int serial_omap_get_mctrl(struct uart_port *port)
{
struct uart_omap_port *up = to_uart_omap_port(port);
@@ -1369,6 +1341,7 @@ serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
static const struct uart_ops serial_omap_pops = {
.tx_empty = serial_omap_tx_empty,
+ .put_char = serial_omap_put_char,
.set_mctrl = serial_omap_set_mctrl,
.get_mctrl = serial_omap_get_mctrl,
.stop_tx = serial_omap_stop_tx,
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index e80ba8e10407..182bf2de5e29 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -171,39 +171,6 @@ static inline void receive_chars(struct uart_pxa_port *up, int *status)
serial_out(up, UART_IER, up->ier);
}
-static void transmit_chars(struct uart_pxa_port *up)
-{
- struct circ_buf *xmit = &up->port.state->xmit;
- int count;
-
- 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);
-}
-
static void serial_pxa_start_tx(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
@@ -253,7 +220,7 @@ static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
receive_chars(up, &lsr);
check_modem_status(up);
if (lsr & UART_LSR_THRE)
- transmit_chars(up);
+ uart_port_tx_limit(&up->port, up->port.fifosize / 2);
spin_unlock(&up->port.lock);
return IRQ_HANDLED;
}
@@ -271,6 +238,13 @@ static unsigned int serial_pxa_tx_empty(struct uart_port *port)
return ret;
}
+static void serial_pxa_put_char(struct uart_port *port, unsigned char ch)
+{
+ struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+
+ serial_out(up, UART_TX, ch);
+}
+
static unsigned int serial_pxa_get_mctrl(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
@@ -742,6 +716,7 @@ static struct console serial_pxa_console = {
static const struct uart_ops serial_pxa_pops = {
.tx_empty = serial_pxa_tx_empty,
+ .put_char = serial_pxa_put_char,
.set_mctrl = serial_pxa_set_mctrl,
.get_mctrl = serial_pxa_get_mctrl,
.stop_tx = serial_pxa_stop_tx,
diff --git a/drivers/tty/serial/rp2.c b/drivers/tty/serial/rp2.c
index 6689d8add8f7..18725fe9028c 100644
--- a/drivers/tty/serial/rp2.c
+++ b/drivers/tty/serial/rp2.c
@@ -283,6 +283,13 @@ static unsigned int rp2_uart_tx_empty(struct uart_port *port)
return tx_fifo_bytes ? 0 : TIOCSER_TEMT;
}
+static void rp2_put_char(struct uart_port *port, unsigned char ch)
+{
+ struct rp2_uart_port *up = port_to_up(port);
+
+ writeb(ch, up->base + RP2_DATA_BYTE);
+}
+
static unsigned int rp2_uart_get_mctrl(struct uart_port *port)
{
struct rp2_uart_port *up = port_to_up(port);
@@ -428,32 +435,8 @@ 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;
-
- 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_limit(&up->port,
+ FIFO_SIZE - readw(up->base + RP2_TX_FIFO_COUNT));
}
static void rp2_ch_interrupt(struct rp2_uart_port *up)
@@ -575,6 +558,7 @@ static int rp2_uart_verify_port(struct uart_port *port,
static const struct uart_ops rp2_uart_ops = {
.tx_empty = rp2_uart_tx_empty,
+ .put_char = rp2_put_char,
.set_mctrl = rp2_uart_set_mctrl,
.get_mctrl = rp2_uart_get_mctrl,
.stop_tx = rp2_uart_stop_tx,
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index 2213e6b841d3..41b4b33b110e 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -319,38 +319,6 @@ receive_chars(struct uart_port *up, unsigned int *status)
*status = disr;
}
-static inline void transmit_chars(struct uart_port *up)
-{
- struct circ_buf *xmit = &up->state->xmit;
- int count;
-
- 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);
-}
-
static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
{
int pass_counter = 0;
@@ -371,7 +339,7 @@ static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
if (status & TXX9_SIDISR_RDIS)
receive_chars(up, &status);
if (status & TXX9_SIDISR_TDIS)
- transmit_chars(up);
+ uart_port_tx_limit(up, TXX9_SIO_TX_FIFO);
/* Clear TX/RX Int. Status */
sio_mask(up, TXX9_SIDISR,
TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
@@ -397,6 +365,11 @@ static unsigned int serial_txx9_tx_empty(struct uart_port *up)
return ret;
}
+static void serial_txx9_put_char(struct uart_port *up, unsigned char ch)
+{
+ sio_out(up, TXX9_SITFIFO, ch);
+}
+
static unsigned int serial_txx9_get_mctrl(struct uart_port *up)
{
unsigned int ret;
@@ -810,6 +783,7 @@ serial_txx9_type(struct uart_port *port)
static const struct uart_ops serial_txx9_pops = {
.tx_empty = serial_txx9_tx_empty,
+ .put_char = serial_txx9_put_char,
.set_mctrl = serial_txx9_set_mctrl,
.get_mctrl = serial_txx9_get_mctrl,
.stop_tx = serial_txx9_stop_tx,
diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c
index f5ac14c384c4..7ec9ef732eb8 100644
--- a/drivers/tty/serial/sifive.c
+++ b/drivers/tty/serial/sifive.c
@@ -289,46 +289,6 @@ static void __ssp_transmit_char(struct sifive_serial_port *ssp, int ch)
__ssp_writel(ch, SIFIVE_SERIAL_TXDATA_OFFS, ssp);
}
-/**
- * __ssp_transmit_chars() - enqueue multiple bytes onto the TX FIFO
- * @ssp: pointer to a struct sifive_serial_port
- *
- * Transfer up to a TX FIFO size's worth of characters from the Linux serial
- * transmit buffer to the SiFive UART TX FIFO.
- *
- * Context: Any context. Expects @ssp->port.lock to be held by caller.
- */
-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);
-
- if (uart_circ_empty(xmit))
- sifive_serial_stop_tx(&ssp->port);
-}
-
/**
* __ssp_enable_txwm() - enable transmit watermark interrupts
* @ssp: pointer to a struct sifive_serial_port
@@ -565,7 +525,7 @@ static irqreturn_t sifive_serial_irq(int irq, void *dev_id)
if (ip & SIFIVE_SERIAL_IP_RXWM_MASK)
__ssp_receive_chars(ssp);
if (ip & SIFIVE_SERIAL_IP_TXWM_MASK)
- __ssp_transmit_chars(ssp);
+ uart_port_tx_limit(&ssp->port, SIFIVE_TX_FIFO_DEPTH);
spin_unlock(&ssp->port.lock);
@@ -577,6 +537,11 @@ static unsigned int sifive_serial_tx_empty(struct uart_port *port)
return TIOCSER_TEMT;
}
+static void sifive_serial_put_char(struct uart_port *port, unsigned char ch)
+{
+ __ssp_transmit_char(port_to_sifive_serial_port(port), ch);
+}
+
static unsigned int sifive_serial_get_mctrl(struct uart_port *port)
{
return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR;
@@ -905,6 +870,7 @@ static void __ssp_remove_console_port(struct sifive_serial_port *ssp)
static const struct uart_ops sifive_serial_uops = {
.tx_empty = sifive_serial_tx_empty,
+ .put_char = sifive_serial_put_char,
.set_mctrl = sifive_serial_set_mctrl,
.get_mctrl = sifive_serial_get_mctrl,
.stop_tx = sifive_serial_stop_tx,
diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
index 4329b9c9cbf0..d92dc07f0ebb 100644
--- a/drivers/tty/serial/sprd_serial.c
+++ b/drivers/tty/serial/sprd_serial.c
@@ -154,6 +154,11 @@ static unsigned int sprd_tx_empty(struct uart_port *port)
return TIOCSER_TEMT;
}
+static void sprd_put_char(struct uart_port *port, unsigned char ch)
+{
+ serial_out(port, SPRD_TXD, ch);
+}
+
static unsigned int sprd_get_mctrl(struct uart_port *port)
{
return TIOCM_DSR | TIOCM_CTS;
@@ -624,39 +629,6 @@ static inline void sprd_rx(struct uart_port *port)
tty_flip_buffer_push(tty);
}
-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);
-
- if (uart_circ_empty(xmit))
- sprd_stop_tx(port);
-}
-
/* this handles the interrupt from one port */
static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
{
@@ -683,7 +655,7 @@ static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
sprd_rx(port);
if (ims & SPRD_IMSR_TX_FIFO_EMPTY)
- sprd_tx(port);
+ uart_port_tx_limit(port, THLD_TX_EMPTY);
spin_unlock(&port->lock);
@@ -948,6 +920,7 @@ static void sprd_poll_put_char(struct uart_port *port, unsigned char ch)
static const struct uart_ops serial_sprd_ops = {
.tx_empty = sprd_tx_empty,
+ .put_char = sprd_put_char,
.get_mctrl = sprd_get_mctrl,
.set_mctrl = sprd_set_mctrl,
.stop_tx = sprd_stop_tx,
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index d7fd692286cf..e9bb977da576 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -238,50 +238,7 @@ 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);
-
- if (uart_circ_empty(xmit))
- asc_disable_tx_interrupts(port);
+ uart_port_tx_limit(port, asc_hw_txroom(port));
}
static void asc_receive_chars(struct uart_port *port)
@@ -389,6 +346,11 @@ static unsigned int asc_tx_empty(struct uart_port *port)
return asc_txfifo_is_empty(port) ? TIOCSER_TEMT : 0;
}
+static void asc_put_char(struct uart_port *port, unsigned char ch)
+{
+ asc_out(port, ASC_TXBUF, ch);
+}
+
static void asc_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct asc_port *ascport = to_asc_port(port);
@@ -690,6 +652,7 @@ static void asc_put_poll_char(struct uart_port *port, unsigned char c)
static const struct uart_ops asc_uart_ops = {
.tx_empty = asc_tx_empty,
+ .put_char = asc_put_char,
.set_mctrl = asc_set_mctrl,
.get_mctrl = asc_get_mctrl,
.start_tx = asc_start_tx,
diff --git a/drivers/tty/serial/vr41xx_siu.c b/drivers/tty/serial/vr41xx_siu.c
index e0bf003ca3a1..83c28288dfe1 100644
--- a/drivers/tty/serial/vr41xx_siu.c
+++ b/drivers/tty/serial/vr41xx_siu.c
@@ -183,6 +183,11 @@ static unsigned int siu_tx_empty(struct uart_port *port)
return 0;
}
+static void siu_put_char(struct uart_port *port, unsigned char ch)
+{
+ siu_write(port, UART_TX, ch);
+}
+
static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
uint8_t mcr = 0;
@@ -370,40 +375,6 @@ static inline void check_modem_status(struct uart_port *port)
wake_up_interruptible(&port->state->port.delta_msr_wait);
}
-static inline void transmit_chars(struct uart_port *port)
-{
- struct circ_buf *xmit;
- int max_count = TX_MAX_COUNT;
-
- xmit = &port->state->xmit;
-
- if (port->x_char) {
- siu_write(port, UART_TX, port->x_char);
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- siu_stop_tx(port);
- return;
- }
-
- do {
- siu_write(port, UART_TX, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (max_count-- > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- if (uart_circ_empty(xmit))
- siu_stop_tx(port);
-}
-
static irqreturn_t siu_interrupt(int irq, void *dev_id)
{
struct uart_port *port;
@@ -422,7 +393,7 @@ static irqreturn_t siu_interrupt(int irq, void *dev_id)
check_modem_status(port);
if (lsr & UART_LSR_THRE)
- transmit_chars(port);
+ uart_port_tx_limit(port, TX_MAX_COUNT);
return IRQ_HANDLED;
}
@@ -653,6 +624,7 @@ static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
static const struct uart_ops siu_uart_ops = {
.tx_empty = siu_tx_empty,
+ .put_char = siu_put_char,
.set_mctrl = siu_set_mctrl,
.get_mctrl = siu_get_mctrl,
.stop_tx = siu_stop_tx,
--
2.35.1
