[PATCH 0/5] tty: serial: various cleanups

[PATCH 0/5] tty: serial: various cleanups

[Jiri Slaby]

This is a small cleanup series of what I have accumulated over past few
weeks while doing larger changes.

Jiri Slaby (5):
  tty: serial: mpc52xx_uart: make rx/tx hooks return unsigned
  tty: serial: serial_txx9: remove info print from init
  tty: serial: serial_txx9: remove struct uart_txx9_port
  tty: serial: amba-pl010: use more uart_port pointers
  tty: serial: lpc32xx_hs: use serial_lpc32xx_stop_tx() helper

 drivers/tty/serial/amba-pl010.c   | 174 +++++++-------
 drivers/tty/serial/lpc32xx_hs.c   |  10 +-
 drivers/tty/serial/mpc52xx_uart.c |  22 +-
 drivers/tty/serial/serial_txx9.c  | 369 ++++++++++++++----------------
 4 files changed, 266 insertions(+), 309 deletions(-)

-- 
2.35.1

[PATCH 1/5] tty: serial: mpc52xx_uart: make rx/tx hooks return unsigned

[Jiri Slaby]

All these return bitmasks, so it makes more sense to return unsigned --
this is what a reader and also all the callers expect.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/tty/serial/mpc52xx_uart.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
index 2704dc988e4a..8a6958377764 100644
--- a/drivers/tty/serial/mpc52xx_uart.c
+++ b/drivers/tty/serial/mpc52xx_uart.c
@@ -83,11 +83,11 @@ static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
 
 struct psc_ops {
 	void		(*fifo_init)(struct uart_port *port);
-	int		(*raw_rx_rdy)(struct uart_port *port);
-	int		(*raw_tx_rdy)(struct uart_port *port);
-	int		(*rx_rdy)(struct uart_port *port);
-	int		(*tx_rdy)(struct uart_port *port);
-	int		(*tx_empty)(struct uart_port *port);
+	unsigned int	(*raw_rx_rdy)(struct uart_port *port);
+	unsigned int	(*raw_tx_rdy)(struct uart_port *port);
+	unsigned int	(*rx_rdy)(struct uart_port *port);
+	unsigned int	(*tx_rdy)(struct uart_port *port);
+	unsigned int	(*tx_empty)(struct uart_port *port);
 	void		(*stop_rx)(struct uart_port *port);
 	void		(*start_tx)(struct uart_port *port);
 	void		(*stop_tx)(struct uart_port *port);
@@ -203,34 +203,34 @@ static void mpc52xx_psc_fifo_init(struct uart_port *port)
 	out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
 }
 
-static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
+static unsigned int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
 {
 	return in_be16(&PSC(port)->mpc52xx_psc_status)
 	    & MPC52xx_PSC_SR_RXRDY;
 }
 
-static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
+static unsigned int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
 {
 	return in_be16(&PSC(port)->mpc52xx_psc_status)
 	    & MPC52xx_PSC_SR_TXRDY;
 }
 
 
-static int mpc52xx_psc_rx_rdy(struct uart_port *port)
+static unsigned int mpc52xx_psc_rx_rdy(struct uart_port *port)
 {
 	return in_be16(&PSC(port)->mpc52xx_psc_isr)
 	    & port->read_status_mask
 	    & MPC52xx_PSC_IMR_RXRDY;
 }
 
-static int mpc52xx_psc_tx_rdy(struct uart_port *port)
+static unsigned int mpc52xx_psc_tx_rdy(struct uart_port *port)
 {
 	return in_be16(&PSC(port)->mpc52xx_psc_isr)
 	    & port->read_status_mask
 	    & MPC52xx_PSC_IMR_TXRDY;
 }
 
-static int mpc52xx_psc_tx_empty(struct uart_port *port)
+static unsigned int mpc52xx_psc_tx_empty(struct uart_port *port)
 {
 	u16 sts = in_be16(&PSC(port)->mpc52xx_psc_status);
 
@@ -1365,7 +1365,7 @@ static const struct uart_ops mpc52xx_uart_ops = {
 /* Interrupt handling                                                       */
 /* ======================================================================== */
 
-static inline int
+static inline unsigned int
 mpc52xx_uart_int_rx_chars(struct uart_port *port)
 {
 	struct tty_port *tport = &port->state->port;
-- 
2.35.1

[PATCH 2/5] tty: serial: serial_txx9: remove info print from init

[Jiri Slaby]

Remove the hello print among with version and name definitions. Drivers
should print nothing if they are successful.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/tty/serial/serial_txx9.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index b4d8c2733317..a695e9c1a06a 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -26,9 +26,6 @@
 
 #include <linux/io.h>
 
-static char *serial_version = "1.11";
-static char *serial_name = "TX39/49 Serial driver";
-
 #define PASS_LIMIT	256
 
 #if !defined(CONFIG_SERIAL_TXX9_STDSERIAL)
@@ -1255,8 +1252,6 @@ static int __init serial_txx9_init(void)
 {
 	int ret;
 
- 	printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
-
 	ret = uart_register_driver(&serial_txx9_reg);
 	if (ret)
 		goto out;
-- 
2.35.1

[PATCH 3/5] tty: serial: serial_txx9: remove struct uart_txx9_port

[Jiri Slaby]

It's only a wrapper to struct uart_port, so unwrap the whole code.

No change in functionality is intended.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/tty/serial/serial_txx9.c | 364 ++++++++++++++-----------------
 1 file changed, 167 insertions(+), 197 deletions(-)

diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index a695e9c1a06a..2213e6b841d3 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -54,11 +54,6 @@
  */
 #define UART_NR  CONFIG_SERIAL_TXX9_NR_UARTS
 
-struct uart_txx9_port {
-	struct uart_port	port;
-	/* No additional info for now */
-};
-
 #define TXX9_REGION_SIZE	0x24
 
 /* TXX9 Serial Registers */
@@ -160,42 +155,42 @@ struct uart_txx9_port {
 #define TXX9_SIBGR_BCLK_T6	0x00000300
 #define TXX9_SIBGR_BRD_MASK	0x000000ff
 
-static inline unsigned int sio_in(struct uart_txx9_port *up, int offset)
+static inline unsigned int sio_in(struct uart_port *up, int offset)
 {
-	switch (up->port.iotype) {
+	switch (up->iotype) {
 	default:
-		return __raw_readl(up->port.membase + offset);
+		return __raw_readl(up->membase + offset);
 	case UPIO_PORT:
-		return inl(up->port.iobase + offset);
+		return inl(up->iobase + offset);
 	}
 }
 
 static inline void
-sio_out(struct uart_txx9_port *up, int offset, int value)
+sio_out(struct uart_port *up, int offset, int value)
 {
-	switch (up->port.iotype) {
+	switch (up->iotype) {
 	default:
-		__raw_writel(value, up->port.membase + offset);
+		__raw_writel(value, up->membase + offset);
 		break;
 	case UPIO_PORT:
-		outl(value, up->port.iobase + offset);
+		outl(value, up->iobase + offset);
 		break;
 	}
 }
 
 static inline void
-sio_mask(struct uart_txx9_port *up, int offset, unsigned int value)
+sio_mask(struct uart_port *up, int offset, unsigned int value)
 {
 	sio_out(up, offset, sio_in(up, offset) & ~value);
 }
 static inline void
-sio_set(struct uart_txx9_port *up, int offset, unsigned int value)
+sio_set(struct uart_port *up, int offset, unsigned int value)
 {
 	sio_out(up, offset, sio_in(up, offset) | value);
 }
 
 static inline void
-sio_quot_set(struct uart_txx9_port *up, int quot)
+sio_quot_set(struct uart_port *up, int quot)
 {
 	quot >>= 1;
 	if (quot < 256)
@@ -210,32 +205,23 @@ sio_quot_set(struct uart_txx9_port *up, int quot)
 		sio_out(up, TXX9_SIBGR, 0xff | TXX9_SIBGR_BCLK_T6);
 }
 
-static struct uart_txx9_port *to_uart_txx9_port(struct uart_port *port)
-{
-	return container_of(port, struct uart_txx9_port, port);
-}
-
-static void serial_txx9_stop_tx(struct uart_port *port)
+static void serial_txx9_stop_tx(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
 }
 
-static void serial_txx9_start_tx(struct uart_port *port)
+static void serial_txx9_start_tx(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
 }
 
-static void serial_txx9_stop_rx(struct uart_port *port)
+static void serial_txx9_stop_rx(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
-	up->port.read_status_mask &= ~TXX9_SIDISR_RDIS;
+	up->read_status_mask &= ~TXX9_SIDISR_RDIS;
 }
 
-static void serial_txx9_initialize(struct uart_port *port)
+static void serial_txx9_initialize(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned int tmout = 10000;
 
 	sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST);
@@ -250,15 +236,15 @@ static void serial_txx9_initialize(struct uart_port *port)
 	/* initial settings */
 	sio_out(up, TXX9_SILCR,
 		TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
-		((up->port.flags & UPF_TXX9_USE_SCLK) ?
+		((up->flags & UPF_TXX9_USE_SCLK) ?
 		 TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
-	sio_quot_set(up, uart_get_divisor(port, 9600));
+	sio_quot_set(up, uart_get_divisor(up, 9600));
 	sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
 	sio_out(up, TXX9_SIDICR, 0);
 }
 
 static inline void
-receive_chars(struct uart_txx9_port *up, unsigned int *status)
+receive_chars(struct uart_port *up, unsigned int *status)
 {
 	unsigned char ch;
 	unsigned int disr = *status;
@@ -269,11 +255,11 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
 	do {
 		ch = sio_in(up, TXX9_SIRFIFO);
 		flag = TTY_NORMAL;
-		up->port.icount.rx++;
+		up->icount.rx++;
 
 		/* mask out RFDN_MASK bit added by previous overrun */
 		next_ignore_status_mask =
-			up->port.ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
+			up->ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
 		if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER |
 				     TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) {
 			/*
@@ -281,21 +267,21 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
 			 */
 			if (disr & TXX9_SIDISR_UBRK) {
 				disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER);
-				up->port.icount.brk++;
+				up->icount.brk++;
 				/*
 				 * We do the SysRQ and SAK checking
 				 * here because otherwise the break
 				 * may get masked by ignore_status_mask
 				 * or read_status_mask.
 				 */
-				if (uart_handle_break(&up->port))
+				if (uart_handle_break(up))
 					goto ignore_char;
 			} else if (disr & TXX9_SIDISR_UPER)
-				up->port.icount.parity++;
+				up->icount.parity++;
 			else if (disr & TXX9_SIDISR_UFER)
-				up->port.icount.frame++;
+				up->icount.frame++;
 			if (disr & TXX9_SIDISR_UOER) {
-				up->port.icount.overrun++;
+				up->icount.overrun++;
 				/*
 				 * The receiver read buffer still hold
 				 * a char which caused overrun.
@@ -309,7 +295,7 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
 			/*
 			 * Mask off conditions which should be ingored.
 			 */
-			disr &= up->port.read_status_mask;
+			disr &= up->read_status_mask;
 
 			if (disr & TXX9_SIDISR_UBRK) {
 				flag = TTY_BREAK;
@@ -318,34 +304,34 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
 			else if (disr & TXX9_SIDISR_UFER)
 				flag = TTY_FRAME;
 		}
-		if (uart_handle_sysrq_char(&up->port, ch))
+		if (uart_handle_sysrq_char(up, ch))
 			goto ignore_char;
 
-		uart_insert_char(&up->port, disr, TXX9_SIDISR_UOER, ch, flag);
+		uart_insert_char(up, disr, TXX9_SIDISR_UOER, ch, flag);
 
 	ignore_char:
-		up->port.ignore_status_mask = next_ignore_status_mask;
+		up->ignore_status_mask = next_ignore_status_mask;
 		disr = sio_in(up, TXX9_SIDISR);
 	} while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
 
-	tty_flip_buffer_push(&up->port.state->port);
+	tty_flip_buffer_push(&up->state->port);
 
 	*status = disr;
 }
 
-static inline void transmit_chars(struct uart_txx9_port *up)
+static inline void transmit_chars(struct uart_port *up)
 {
-	struct circ_buf *xmit = &up->port.state->xmit;
+	struct circ_buf *xmit = &up->state->xmit;
 	int count;
 
-	if (up->port.x_char) {
-		sio_out(up, TXX9_SITFIFO, up->port.x_char);
-		up->port.icount.tx++;
-		up->port.x_char = 0;
+	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->port)) {
-		serial_txx9_stop_tx(&up->port);
+	if (uart_circ_empty(xmit) || uart_tx_stopped(up)) {
+		serial_txx9_stop_tx(up);
 		return;
 	}
 
@@ -353,32 +339,32 @@ static inline void transmit_chars(struct uart_txx9_port *up)
 	do {
 		sio_out(up, TXX9_SITFIFO, xmit->buf[xmit->tail]);
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
-		up->port.icount.tx++;
+		up->icount.tx++;
 		if (uart_circ_empty(xmit))
 			break;
 	} while (--count > 0);
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(&up->port);
+		uart_write_wakeup(up);
 
 	if (uart_circ_empty(xmit))
-		serial_txx9_stop_tx(&up->port);
+		serial_txx9_stop_tx(up);
 }
 
 static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
 {
 	int pass_counter = 0;
-	struct uart_txx9_port *up = dev_id;
+	struct uart_port *up = dev_id;
 	unsigned int status;
 
 	while (1) {
-		spin_lock(&up->port.lock);
+		spin_lock(&up->lock);
 		status = sio_in(up, TXX9_SIDISR);
 		if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE))
 			status &= ~TXX9_SIDISR_TDIS;
 		if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
 				TXX9_SIDISR_TOUT))) {
-			spin_unlock(&up->port.lock);
+			spin_unlock(&up->lock);
 			break;
 		}
 
@@ -390,7 +376,7 @@ static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
 		sio_mask(up, TXX9_SIDISR,
 			 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
 			 TXX9_SIDISR_TOUT);
-		spin_unlock(&up->port.lock);
+		spin_unlock(&up->lock);
 
 		if (pass_counter++ > PASS_LIMIT)
 			break;
@@ -399,22 +385,20 @@ static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
 	return pass_counter ? IRQ_HANDLED : IRQ_NONE;
 }
 
-static unsigned int serial_txx9_tx_empty(struct uart_port *port)
+static unsigned int serial_txx9_tx_empty(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned long flags;
 	unsigned int ret;
 
-	spin_lock_irqsave(&up->port.lock, flags);
+	spin_lock_irqsave(&up->lock, flags);
 	ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0;
-	spin_unlock_irqrestore(&up->port.lock, flags);
+	spin_unlock_irqrestore(&up->lock, flags);
 
 	return ret;
 }
 
-static unsigned int serial_txx9_get_mctrl(struct uart_port *port)
+static unsigned int serial_txx9_get_mctrl(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned int ret;
 
 	/* no modem control lines */
@@ -425,9 +409,8 @@ static unsigned int serial_txx9_get_mctrl(struct uart_port *port)
 	return ret;
 }
 
-static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl)
+static void serial_txx9_set_mctrl(struct uart_port *up, unsigned int mctrl)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 
 	if (mctrl & TIOCM_RTS)
 		sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
@@ -435,24 +418,23 @@ static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl)
 		sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
 }
 
-static void serial_txx9_break_ctl(struct uart_port *port, int break_state)
+static void serial_txx9_break_ctl(struct uart_port *up, int break_state)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned long flags;
 
-	spin_lock_irqsave(&up->port.lock, flags);
+	spin_lock_irqsave(&up->lock, flags);
 	if (break_state == -1)
 		sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
 	else
 		sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
-	spin_unlock_irqrestore(&up->port.lock, flags);
+	spin_unlock_irqrestore(&up->lock, flags);
 }
 
 #if defined(CONFIG_SERIAL_TXX9_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
 /*
  *	Wait for transmitter & holding register to empty
  */
-static void wait_for_xmitr(struct uart_txx9_port *up)
+static void wait_for_xmitr(struct uart_port *up)
 {
 	unsigned int tmout = 10000;
 
@@ -462,7 +444,7 @@ static void wait_for_xmitr(struct uart_txx9_port *up)
 		udelay(1);
 
 	/* Wait up to 1s for flow control if necessary */
-	if (up->port.flags & UPF_CONS_FLOW) {
+	if (up->flags & UPF_CONS_FLOW) {
 		tmout = 1000000;
 		while (--tmout &&
 		       (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
@@ -477,11 +459,10 @@ static void wait_for_xmitr(struct uart_txx9_port *up)
  * in an interrupt or debug context.
  */
 
-static int serial_txx9_get_poll_char(struct uart_port *port)
+static int serial_txx9_get_poll_char(struct uart_port *up)
 {
 	unsigned int ier;
 	unsigned char c;
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 
 	/*
 	 *	First save the IER then disable the interrupts
@@ -504,10 +485,9 @@ static int serial_txx9_get_poll_char(struct uart_port *port)
 }
 
 
-static void serial_txx9_put_poll_char(struct uart_port *port, unsigned char c)
+static void serial_txx9_put_poll_char(struct uart_port *up, unsigned char c)
 {
 	unsigned int ier;
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 
 	/*
 	 *	First save the IER then disable the interrupts
@@ -531,9 +511,8 @@ static void serial_txx9_put_poll_char(struct uart_port *port, unsigned char c)
 
 #endif /* CONFIG_CONSOLE_POLL */
 
-static int serial_txx9_startup(struct uart_port *port)
+static int serial_txx9_startup(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned long flags;
 	int retval;
 
@@ -553,7 +532,7 @@ static int serial_txx9_startup(struct uart_port *port)
 	 */
 	sio_out(up, TXX9_SIDISR, 0);
 
-	retval = request_irq(up->port.irq, serial_txx9_interrupt,
+	retval = request_irq(up->irq, serial_txx9_interrupt,
 			     IRQF_SHARED, "serial_txx9", up);
 	if (retval)
 		return retval;
@@ -561,9 +540,9 @@ static int serial_txx9_startup(struct uart_port *port)
 	/*
 	 * Now, initialize the UART
 	 */
-	spin_lock_irqsave(&up->port.lock, flags);
-	serial_txx9_set_mctrl(&up->port, up->port.mctrl);
-	spin_unlock_irqrestore(&up->port.lock, flags);
+	spin_lock_irqsave(&up->lock, flags);
+	serial_txx9_set_mctrl(up, up->mctrl);
+	spin_unlock_irqrestore(&up->lock, flags);
 
 	/* Enable RX/TX */
 	sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
@@ -576,9 +555,8 @@ static int serial_txx9_startup(struct uart_port *port)
 	return 0;
 }
 
-static void serial_txx9_shutdown(struct uart_port *port)
+static void serial_txx9_shutdown(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned long flags;
 
 	/*
@@ -586,9 +564,9 @@ static void serial_txx9_shutdown(struct uart_port *port)
 	 */
 	sio_out(up, TXX9_SIDICR, 0);	/* disable all intrs */
 
-	spin_lock_irqsave(&up->port.lock, flags);
-	serial_txx9_set_mctrl(&up->port, up->port.mctrl);
-	spin_unlock_irqrestore(&up->port.lock, flags);
+	spin_lock_irqsave(&up->lock, flags);
+	serial_txx9_set_mctrl(up, up->mctrl);
+	spin_unlock_irqrestore(&up->lock, flags);
 
 	/*
 	 * Disable break condition
@@ -596,8 +574,8 @@ static void serial_txx9_shutdown(struct uart_port *port)
 	sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
 
 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
-	if (up->port.cons && up->port.line == up->port.cons->index) {
-		free_irq(up->port.irq, up);
+	if (up->cons && up->line == up->cons->index) {
+		free_irq(up->irq, up);
 		return;
 	}
 #endif
@@ -611,14 +589,13 @@ static void serial_txx9_shutdown(struct uart_port *port)
 	/* Disable RX/TX */
 	sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
 
-	free_irq(up->port.irq, up);
+	free_irq(up->irq, up);
 }
 
 static void
-serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
+serial_txx9_set_termios(struct uart_port *up, struct ktermios *termios,
 		       struct ktermios *old)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned int cval, fcr = 0;
 	unsigned long flags;
 	unsigned int baud, quot;
@@ -658,8 +635,8 @@ serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16/2);
-	quot = uart_get_divisor(port, baud);
+	baud = uart_get_baud_rate(up, termios, old, 0, up->uartclk/16/2);
+	quot = uart_get_divisor(up, baud);
 
 	/* Set up FIFOs */
 	/* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
@@ -669,45 +646,45 @@ serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
 	 * Ok, we're now changing the port state.  Do it with
 	 * interrupts disabled.
 	 */
-	spin_lock_irqsave(&up->port.lock, flags);
+	spin_lock_irqsave(&up->lock, flags);
 
 	/*
 	 * Update the per-port timeout.
 	 */
-	uart_update_timeout(port, termios->c_cflag, baud);
+	uart_update_timeout(up, termios->c_cflag, baud);
 
-	up->port.read_status_mask = TXX9_SIDISR_UOER |
+	up->read_status_mask = TXX9_SIDISR_UOER |
 		TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS;
 	if (termios->c_iflag & INPCK)
-		up->port.read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
+		up->read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
 	if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
-		up->port.read_status_mask |= TXX9_SIDISR_UBRK;
+		up->read_status_mask |= TXX9_SIDISR_UBRK;
 
 	/*
 	 * Characteres to ignore
 	 */
-	up->port.ignore_status_mask = 0;
+	up->ignore_status_mask = 0;
 	if (termios->c_iflag & IGNPAR)
-		up->port.ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
+		up->ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
 	if (termios->c_iflag & IGNBRK) {
-		up->port.ignore_status_mask |= TXX9_SIDISR_UBRK;
+		up->ignore_status_mask |= TXX9_SIDISR_UBRK;
 		/*
 		 * If we're ignoring parity and break indicators,
 		 * ignore overruns too (for real raw support).
 		 */
 		if (termios->c_iflag & IGNPAR)
-			up->port.ignore_status_mask |= TXX9_SIDISR_UOER;
+			up->ignore_status_mask |= TXX9_SIDISR_UOER;
 	}
 
 	/*
 	 * ignore all characters if CREAD is not set
 	 */
 	if ((termios->c_cflag & CREAD) == 0)
-		up->port.ignore_status_mask |= TXX9_SIDISR_RDIS;
+		up->ignore_status_mask |= TXX9_SIDISR_RDIS;
 
 	/* CTS flow control flag */
 	if ((termios->c_cflag & CRTSCTS) &&
-	    (up->port.flags & UPF_TXX9_HAVE_CTS_LINE)) {
+	    (up->flags & UPF_TXX9_HAVE_CTS_LINE)) {
 		sio_set(up, TXX9_SIFLCR,
 			TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
 	} else {
@@ -719,8 +696,8 @@ serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
 	sio_quot_set(up, quot);
 	sio_out(up, TXX9_SIFCR, fcr);
 
-	serial_txx9_set_mctrl(&up->port, up->port.mctrl);
-	spin_unlock_irqrestore(&up->port.lock, flags);
+	serial_txx9_set_mctrl(up, up->mctrl);
+	spin_unlock_irqrestore(&up->lock, flags);
 }
 
 static void
@@ -739,76 +716,73 @@ serial_txx9_pm(struct uart_port *port, unsigned int state,
 		serial_txx9_initialize(port);
 }
 
-static int serial_txx9_request_resource(struct uart_txx9_port *up)
+static int serial_txx9_request_resource(struct uart_port *up)
 {
 	unsigned int size = TXX9_REGION_SIZE;
 	int ret = 0;
 
-	switch (up->port.iotype) {
+	switch (up->iotype) {
 	default:
-		if (!up->port.mapbase)
+		if (!up->mapbase)
 			break;
 
-		if (!request_mem_region(up->port.mapbase, size, "serial_txx9")) {
+		if (!request_mem_region(up->mapbase, size, "serial_txx9")) {
 			ret = -EBUSY;
 			break;
 		}
 
-		if (up->port.flags & UPF_IOREMAP) {
-			up->port.membase = ioremap(up->port.mapbase, size);
-			if (!up->port.membase) {
-				release_mem_region(up->port.mapbase, size);
+		if (up->flags & UPF_IOREMAP) {
+			up->membase = ioremap(up->mapbase, size);
+			if (!up->membase) {
+				release_mem_region(up->mapbase, size);
 				ret = -ENOMEM;
 			}
 		}
 		break;
 
 	case UPIO_PORT:
-		if (!request_region(up->port.iobase, size, "serial_txx9"))
+		if (!request_region(up->iobase, size, "serial_txx9"))
 			ret = -EBUSY;
 		break;
 	}
 	return ret;
 }
 
-static void serial_txx9_release_resource(struct uart_txx9_port *up)
+static void serial_txx9_release_resource(struct uart_port *up)
 {
 	unsigned int size = TXX9_REGION_SIZE;
 
-	switch (up->port.iotype) {
+	switch (up->iotype) {
 	default:
-		if (!up->port.mapbase)
+		if (!up->mapbase)
 			break;
 
-		if (up->port.flags & UPF_IOREMAP) {
-			iounmap(up->port.membase);
-			up->port.membase = NULL;
+		if (up->flags & UPF_IOREMAP) {
+			iounmap(up->membase);
+			up->membase = NULL;
 		}
 
-		release_mem_region(up->port.mapbase, size);
+		release_mem_region(up->mapbase, size);
 		break;
 
 	case UPIO_PORT:
-		release_region(up->port.iobase, size);
+		release_region(up->iobase, size);
 		break;
 	}
 }
 
-static void serial_txx9_release_port(struct uart_port *port)
+static void serial_txx9_release_port(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	serial_txx9_release_resource(up);
 }
 
-static int serial_txx9_request_port(struct uart_port *port)
+static int serial_txx9_request_port(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	return serial_txx9_request_resource(up);
 }
 
-static void serial_txx9_config_port(struct uart_port *port, int uflags)
+static void serial_txx9_config_port(struct uart_port *up, int uflags)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	int ret;
 
 	/*
@@ -818,14 +792,14 @@ static void serial_txx9_config_port(struct uart_port *port, int uflags)
 	ret = serial_txx9_request_resource(up);
 	if (ret < 0)
 		return;
-	port->type = PORT_TXX9;
-	up->port.fifosize = TXX9_SIO_TX_FIFO;
+	up->type = PORT_TXX9;
+	up->fifosize = TXX9_SIO_TX_FIFO;
 
 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
-	if (up->port.line == up->port.cons->index)
+	if (up->line == up->cons->index)
 		return;
 #endif
-	serial_txx9_initialize(port);
+	serial_txx9_initialize(up);
 }
 
 static const char *
@@ -856,7 +830,7 @@ static const struct uart_ops serial_txx9_pops = {
 #endif
 };
 
-static struct uart_txx9_port serial_txx9_ports[UART_NR];
+static struct uart_port serial_txx9_ports[UART_NR];
 
 static void __init serial_txx9_register_ports(struct uart_driver *drv,
 					      struct device *dev)
@@ -864,22 +838,20 @@ static void __init serial_txx9_register_ports(struct uart_driver *drv,
 	int i;
 
 	for (i = 0; i < UART_NR; i++) {
-		struct uart_txx9_port *up = &serial_txx9_ports[i];
+		struct uart_port *up = &serial_txx9_ports[i];
 
-		up->port.line = i;
-		up->port.ops = &serial_txx9_pops;
-		up->port.dev = dev;
-		if (up->port.iobase || up->port.mapbase)
-			uart_add_one_port(drv, &up->port);
+		up->line = i;
+		up->ops = &serial_txx9_pops;
+		up->dev = dev;
+		if (up->iobase || up->mapbase)
+			uart_add_one_port(drv, up);
 	}
 }
 
 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
 
-static void serial_txx9_console_putchar(struct uart_port *port, unsigned char ch)
+static void serial_txx9_console_putchar(struct uart_port *up, unsigned char ch)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
-
 	wait_for_xmitr(up);
 	sio_out(up, TXX9_SITFIFO, ch);
 }
@@ -893,7 +865,7 @@ static void serial_txx9_console_putchar(struct uart_port *port, unsigned char ch
 static void
 serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
 {
-	struct uart_txx9_port *up = &serial_txx9_ports[co->index];
+	struct uart_port *up = &serial_txx9_ports[co->index];
 	unsigned int ier, flcr;
 
 	/*
@@ -905,10 +877,10 @@ serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
 	 *	Disable flow-control if enabled (and unnecessary)
 	 */
 	flcr = sio_in(up, TXX9_SIFLCR);
-	if (!(up->port.flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
+	if (!(up->flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
 		sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES);
 
-	uart_console_write(&up->port, s, count, serial_txx9_console_putchar);
+	uart_console_write(up, s, count, serial_txx9_console_putchar);
 
 	/*
 	 *	Finally, wait for transmitter to become empty
@@ -921,8 +893,7 @@ serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
 
 static int __init serial_txx9_console_setup(struct console *co, char *options)
 {
-	struct uart_port *port;
-	struct uart_txx9_port *up;
+	struct uart_port *up;
 	int baud = 9600;
 	int bits = 8;
 	int parity = 'n';
@@ -936,16 +907,15 @@ static int __init serial_txx9_console_setup(struct console *co, char *options)
 	if (co->index >= UART_NR)
 		co->index = 0;
 	up = &serial_txx9_ports[co->index];
-	port = &up->port;
-	if (!port->ops)
+	if (!up->ops)
 		return -ENODEV;
 
-	serial_txx9_initialize(&up->port);
+	serial_txx9_initialize(up);
 
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
 
-	return uart_set_options(port, co, baud, parity, bits, flow);
+	return uart_set_options(up, co, baud, parity, bits, flow);
 }
 
 static struct uart_driver serial_txx9_reg;
@@ -986,9 +956,9 @@ int __init early_serial_txx9_setup(struct uart_port *port)
 	if (port->line >= ARRAY_SIZE(serial_txx9_ports))
 		return -ENODEV;
 
-	serial_txx9_ports[port->line].port = *port;
-	serial_txx9_ports[port->line].port.ops = &serial_txx9_pops;
-	serial_txx9_ports[port->line].port.flags |=
+	serial_txx9_ports[port->line] = *port;
+	serial_txx9_ports[port->line].ops = &serial_txx9_pops;
+	serial_txx9_ports[port->line].flags |=
 		UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
 	return 0;
 }
@@ -1009,14 +979,14 @@ static DEFINE_MUTEX(serial_txx9_mutex);
 static int serial_txx9_register_port(struct uart_port *port)
 {
 	int i;
-	struct uart_txx9_port *uart;
+	struct uart_port *uart;
 	int ret = -ENOSPC;
 
 	mutex_lock(&serial_txx9_mutex);
 	for (i = 0; i < UART_NR; i++) {
 		uart = &serial_txx9_ports[i];
-		if (uart_match_port(&uart->port, port)) {
-			uart_remove_one_port(&serial_txx9_reg, &uart->port);
+		if (uart_match_port(uart, port)) {
+			uart_remove_one_port(&serial_txx9_reg, uart);
 			break;
 		}
 	}
@@ -1024,24 +994,24 @@ static int serial_txx9_register_port(struct uart_port *port)
 		/* Find unused port */
 		for (i = 0; i < UART_NR; i++) {
 			uart = &serial_txx9_ports[i];
-			if (!(uart->port.iobase || uart->port.mapbase))
+			if (!(uart->iobase || uart->mapbase))
 				break;
 		}
 	}
 	if (i < UART_NR) {
-		uart->port.iobase = port->iobase;
-		uart->port.membase = port->membase;
-		uart->port.irq      = port->irq;
-		uart->port.uartclk  = port->uartclk;
-		uart->port.iotype   = port->iotype;
-		uart->port.flags    = port->flags
+		uart->iobase = port->iobase;
+		uart->membase = port->membase;
+		uart->irq      = port->irq;
+		uart->uartclk  = port->uartclk;
+		uart->iotype   = port->iotype;
+		uart->flags    = port->flags
 			| UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
-		uart->port.mapbase  = port->mapbase;
+		uart->mapbase  = port->mapbase;
 		if (port->dev)
-			uart->port.dev = port->dev;
-		ret = uart_add_one_port(&serial_txx9_reg, &uart->port);
+			uart->dev = port->dev;
+		ret = uart_add_one_port(&serial_txx9_reg, uart);
 		if (ret == 0)
-			ret = uart->port.line;
+			ret = uart->line;
 	}
 	mutex_unlock(&serial_txx9_mutex);
 	return ret;
@@ -1056,16 +1026,16 @@ static int serial_txx9_register_port(struct uart_port *port)
  */
 static void serial_txx9_unregister_port(int line)
 {
-	struct uart_txx9_port *uart = &serial_txx9_ports[line];
+	struct uart_port *uart = &serial_txx9_ports[line];
 
 	mutex_lock(&serial_txx9_mutex);
-	uart_remove_one_port(&serial_txx9_reg, &uart->port);
-	uart->port.flags = 0;
-	uart->port.type = PORT_UNKNOWN;
-	uart->port.iobase = 0;
-	uart->port.mapbase = 0;
-	uart->port.membase = NULL;
-	uart->port.dev = NULL;
+	uart_remove_one_port(&serial_txx9_reg, uart);
+	uart->flags = 0;
+	uart->type = PORT_UNKNOWN;
+	uart->iobase = 0;
+	uart->mapbase = 0;
+	uart->membase = NULL;
+	uart->dev = NULL;
 	mutex_unlock(&serial_txx9_mutex);
 }
 
@@ -1108,9 +1078,9 @@ static int serial_txx9_remove(struct platform_device *dev)
 	int i;
 
 	for (i = 0; i < UART_NR; i++) {
-		struct uart_txx9_port *up = &serial_txx9_ports[i];
+		struct uart_port *up = &serial_txx9_ports[i];
 
-		if (up->port.dev == &dev->dev)
+		if (up->dev == &dev->dev)
 			serial_txx9_unregister_port(i);
 	}
 	return 0;
@@ -1122,10 +1092,10 @@ static int serial_txx9_suspend(struct platform_device *dev, pm_message_t state)
 	int i;
 
 	for (i = 0; i < UART_NR; i++) {
-		struct uart_txx9_port *up = &serial_txx9_ports[i];
+		struct uart_port *up = &serial_txx9_ports[i];
 
-		if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
-			uart_suspend_port(&serial_txx9_reg, &up->port);
+		if (up->type != PORT_UNKNOWN && up->dev == &dev->dev)
+			uart_suspend_port(&serial_txx9_reg, up);
 	}
 
 	return 0;
@@ -1136,10 +1106,10 @@ static int serial_txx9_resume(struct platform_device *dev)
 	int i;
 
 	for (i = 0; i < UART_NR; i++) {
-		struct uart_txx9_port *up = &serial_txx9_ports[i];
+		struct uart_port *up = &serial_txx9_ports[i];
 
-		if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
-			uart_resume_port(&serial_txx9_reg, &up->port);
+		if (up->type != PORT_UNKNOWN && up->dev == &dev->dev)
+			uart_resume_port(&serial_txx9_reg, up);
 	}
 
 	return 0;
@@ -1195,10 +1165,10 @@ pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
 
 static void pciserial_txx9_remove_one(struct pci_dev *dev)
 {
-	struct uart_txx9_port *up = pci_get_drvdata(dev);
+	struct uart_port *up = pci_get_drvdata(dev);
 
 	if (up) {
-		serial_txx9_unregister_port(up->port.line);
+		serial_txx9_unregister_port(up->line);
 		pci_disable_device(dev);
 	}
 }
@@ -1206,10 +1176,10 @@ static void pciserial_txx9_remove_one(struct pci_dev *dev)
 #ifdef CONFIG_PM
 static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
 {
-	struct uart_txx9_port *up = pci_get_drvdata(dev);
+	struct uart_port *up = pci_get_drvdata(dev);
 
 	if (up)
-		uart_suspend_port(&serial_txx9_reg, &up->port);
+		uart_suspend_port(&serial_txx9_reg, up);
 	pci_save_state(dev);
 	pci_set_power_state(dev, pci_choose_state(dev, state));
 	return 0;
@@ -1217,12 +1187,12 @@ static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
 
 static int pciserial_txx9_resume_one(struct pci_dev *dev)
 {
-	struct uart_txx9_port *up = pci_get_drvdata(dev);
+	struct uart_port *up = pci_get_drvdata(dev);
 
 	pci_set_power_state(dev, PCI_D0);
 	pci_restore_state(dev);
 	if (up)
-		uart_resume_port(&serial_txx9_reg, &up->port);
+		uart_resume_port(&serial_txx9_reg, up);
 	return 0;
 }
 #endif
@@ -1302,9 +1272,9 @@ static void __exit serial_txx9_exit(void)
 	platform_driver_unregister(&serial_txx9_plat_driver);
 	platform_device_unregister(serial_txx9_plat_devs);
 	for (i = 0; i < UART_NR; i++) {
-		struct uart_txx9_port *up = &serial_txx9_ports[i];
-		if (up->port.iobase || up->port.mapbase)
-			uart_remove_one_port(&serial_txx9_reg, &up->port);
+		struct uart_port *up = &serial_txx9_ports[i];
+		if (up->iobase || up->mapbase)
+			uart_remove_one_port(&serial_txx9_reg, up);
 	}
 
 	uart_unregister_driver(&serial_txx9_reg);
-- 
2.35.1

[PATCH 4/5] tty: serial: amba-pl010: use more uart_port pointers

[Jiri Slaby]

The code uses uart_amba_port::port on many places. Sometimes it even
needs not uart_amba_port itself. So simplify the code on many places
and remove the need of uart_amba_port on some places completely.

No functional changes intended. The objdump -d output shows only a code
move in pl010_rx_chars().

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Russell King <linux@armlinux.org.uk>
---
 drivers/tty/serial/amba-pl010.c | 174 +++++++++++++++-----------------
 1 file changed, 84 insertions(+), 90 deletions(-)

diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
index 896f66cacf8b..fae0b581ff42 100644
--- a/drivers/tty/serial/amba-pl010.c
+++ b/drivers/tty/serial/amba-pl010.c
@@ -110,38 +110,38 @@ static void pl010_enable_ms(struct uart_port *port)
 	writel(cr, uap->port.membase + UART010_CR);
 }
 
-static void pl010_rx_chars(struct uart_amba_port *uap)
+static void pl010_rx_chars(struct uart_port *port)
 {
 	unsigned int status, ch, flag, rsr, max_count = 256;
 
-	status = readb(uap->port.membase + UART01x_FR);
+	status = readb(port->membase + UART01x_FR);
 	while (UART_RX_DATA(status) && max_count--) {
-		ch = readb(uap->port.membase + UART01x_DR);
+		ch = readb(port->membase + UART01x_DR);
 		flag = TTY_NORMAL;
 
-		uap->port.icount.rx++;
+		port->icount.rx++;
 
 		/*
 		 * Note that the error handling code is
 		 * out of the main execution path
 		 */
-		rsr = readb(uap->port.membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
+		rsr = readb(port->membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
 		if (unlikely(rsr & UART01x_RSR_ANY)) {
-			writel(0, uap->port.membase + UART01x_ECR);
+			writel(0, port->membase + UART01x_ECR);
 
 			if (rsr & UART01x_RSR_BE) {
 				rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
-				uap->port.icount.brk++;
-				if (uart_handle_break(&uap->port))
+				port->icount.brk++;
+				if (uart_handle_break(port))
 					goto ignore_char;
 			} else if (rsr & UART01x_RSR_PE)
-				uap->port.icount.parity++;
+				port->icount.parity++;
 			else if (rsr & UART01x_RSR_FE)
-				uap->port.icount.frame++;
+				port->icount.frame++;
 			if (rsr & UART01x_RSR_OE)
-				uap->port.icount.overrun++;
+				port->icount.overrun++;
 
-			rsr &= uap->port.read_status_mask;
+			rsr &= port->read_status_mask;
 
 			if (rsr & UART01x_RSR_BE)
 				flag = TTY_BREAK;
@@ -151,56 +151,57 @@ static void pl010_rx_chars(struct uart_amba_port *uap)
 				flag = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char(&uap->port, ch))
+		if (uart_handle_sysrq_char(port, ch))
 			goto ignore_char;
 
-		uart_insert_char(&uap->port, rsr, UART01x_RSR_OE, ch, flag);
+		uart_insert_char(port, rsr, UART01x_RSR_OE, ch, flag);
 
 	ignore_char:
-		status = readb(uap->port.membase + UART01x_FR);
+		status = readb(port->membase + UART01x_FR);
 	}
-	tty_flip_buffer_push(&uap->port.state->port);
+	tty_flip_buffer_push(&port->state->port);
 }
 
-static void pl010_tx_chars(struct uart_amba_port *uap)
+static void pl010_tx_chars(struct uart_port *port)
 {
-	struct circ_buf *xmit = &uap->port.state->xmit;
+	struct circ_buf *xmit = &port->state->xmit;
 	int count;
 
-	if (uap->port.x_char) {
-		writel(uap->port.x_char, uap->port.membase + UART01x_DR);
-		uap->port.icount.tx++;
-		uap->port.x_char = 0;
+	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(&uap->port)) {
-		pl010_stop_tx(&uap->port);
+	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+		pl010_stop_tx(port);
 		return;
 	}
 
-	count = uap->port.fifosize >> 1;
+	count = port->fifosize >> 1;
 	do {
-		writel(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR);
+		writel(xmit->buf[xmit->tail], port->membase + UART01x_DR);
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
-		uap->port.icount.tx++;
+		port->icount.tx++;
 		if (uart_circ_empty(xmit))
 			break;
 	} while (--count > 0);
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(&uap->port);
+		uart_write_wakeup(port);
 
 	if (uart_circ_empty(xmit))
-		pl010_stop_tx(&uap->port);
+		pl010_stop_tx(port);
 }
 
 static void pl010_modem_status(struct uart_amba_port *uap)
 {
+	struct uart_port *port = &uap->port;
 	unsigned int status, delta;
 
-	writel(0, uap->port.membase + UART010_ICR);
+	writel(0, port->membase + UART010_ICR);
 
-	status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
+	status = readb(port->membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
 
 	delta = status ^ uap->old_status;
 	uap->old_status = status;
@@ -209,65 +210,63 @@ static void pl010_modem_status(struct uart_amba_port *uap)
 		return;
 
 	if (delta & UART01x_FR_DCD)
-		uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
+		uart_handle_dcd_change(port, status & UART01x_FR_DCD);
 
 	if (delta & UART01x_FR_DSR)
-		uap->port.icount.dsr++;
+		port->icount.dsr++;
 
 	if (delta & UART01x_FR_CTS)
-		uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
+		uart_handle_cts_change(port, status & UART01x_FR_CTS);
 
-	wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
+	wake_up_interruptible(&port->state->port.delta_msr_wait);
 }
 
 static irqreturn_t pl010_int(int irq, void *dev_id)
 {
 	struct uart_amba_port *uap = dev_id;
+	struct uart_port *port = &uap->port;
 	unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
 	int handled = 0;
 
-	spin_lock(&uap->port.lock);
+	spin_lock(&port->lock);
 
-	status = readb(uap->port.membase + UART010_IIR);
+	status = readb(port->membase + UART010_IIR);
 	if (status) {
 		do {
 			if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
-				pl010_rx_chars(uap);
+				pl010_rx_chars(port);
 			if (status & UART010_IIR_MIS)
 				pl010_modem_status(uap);
 			if (status & UART010_IIR_TIS)
-				pl010_tx_chars(uap);
+				pl010_tx_chars(port);
 
 			if (pass_counter-- == 0)
 				break;
 
-			status = readb(uap->port.membase + UART010_IIR);
+			status = readb(port->membase + UART010_IIR);
 		} while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
 				   UART010_IIR_TIS));
 		handled = 1;
 	}
 
-	spin_unlock(&uap->port.lock);
+	spin_unlock(&port->lock);
 
 	return IRQ_RETVAL(handled);
 }
 
 static unsigned int pl010_tx_empty(struct uart_port *port)
 {
-	struct uart_amba_port *uap =
-		container_of(port, struct uart_amba_port, port);
-	unsigned int status = readb(uap->port.membase + UART01x_FR);
+	unsigned int status = readb(port->membase + UART01x_FR);
+
 	return status & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
 }
 
 static unsigned int pl010_get_mctrl(struct uart_port *port)
 {
-	struct uart_amba_port *uap =
-		container_of(port, struct uart_amba_port, port);
 	unsigned int result = 0;
 	unsigned int status;
 
-	status = readb(uap->port.membase + UART01x_FR);
+	status = readb(port->membase + UART01x_FR);
 	if (status & UART01x_FR_DCD)
 		result |= TIOCM_CAR;
 	if (status & UART01x_FR_DSR)
@@ -284,24 +283,22 @@ static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
 		container_of(port, struct uart_amba_port, port);
 
 	if (uap->data)
-		uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl);
+		uap->data->set_mctrl(uap->dev, port->membase, mctrl);
 }
 
 static void pl010_break_ctl(struct uart_port *port, int break_state)
 {
-	struct uart_amba_port *uap =
-		container_of(port, struct uart_amba_port, port);
 	unsigned long flags;
 	unsigned int lcr_h;
 
-	spin_lock_irqsave(&uap->port.lock, flags);
-	lcr_h = readb(uap->port.membase + UART010_LCRH);
+	spin_lock_irqsave(&port->lock, flags);
+	lcr_h = readb(port->membase + UART010_LCRH);
 	if (break_state == -1)
 		lcr_h |= UART01x_LCRH_BRK;
 	else
 		lcr_h &= ~UART01x_LCRH_BRK;
-	writel(lcr_h, uap->port.membase + UART010_LCRH);
-	spin_unlock_irqrestore(&uap->port.lock, flags);
+	writel(lcr_h, port->membase + UART010_LCRH);
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static int pl010_startup(struct uart_port *port)
@@ -317,25 +314,25 @@ static int pl010_startup(struct uart_port *port)
 	if (retval)
 		goto out;
 
-	uap->port.uartclk = clk_get_rate(uap->clk);
+	port->uartclk = clk_get_rate(uap->clk);
 
 	/*
 	 * Allocate the IRQ
 	 */
-	retval = request_irq(uap->port.irq, pl010_int, 0, "uart-pl010", uap);
+	retval = request_irq(port->irq, pl010_int, 0, "uart-pl010", uap);
 	if (retval)
 		goto clk_dis;
 
 	/*
 	 * initialise the old status of the modem signals
 	 */
-	uap->old_status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
+	uap->old_status = readb(port->membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
 
 	/*
 	 * Finally, enable interrupts
 	 */
 	writel(UART01x_CR_UARTEN | UART010_CR_RIE | UART010_CR_RTIE,
-	       uap->port.membase + UART010_CR);
+	       port->membase + UART010_CR);
 
 	return 0;
 
@@ -353,17 +350,17 @@ static void pl010_shutdown(struct uart_port *port)
 	/*
 	 * Free the interrupt
 	 */
-	free_irq(uap->port.irq, uap);
+	free_irq(port->irq, uap);
 
 	/*
 	 * disable all interrupts, disable the port
 	 */
-	writel(0, uap->port.membase + UART010_CR);
+	writel(0, port->membase + UART010_CR);
 
 	/* disable break condition and fifos */
-	writel(readb(uap->port.membase + UART010_LCRH) &
+	writel(readb(port->membase + UART010_LCRH) &
 		~(UART01x_LCRH_BRK | UART01x_LCRH_FEN),
-	       uap->port.membase + UART010_LCRH);
+	       port->membase + UART010_LCRH);
 
 	/*
 	 * Shut down the clock producer
@@ -375,8 +372,6 @@ static void
 pl010_set_termios(struct uart_port *port, struct ktermios *termios,
 		     struct ktermios *old)
 {
-	struct uart_amba_port *uap =
-		container_of(port, struct uart_amba_port, port);
 	unsigned int lcr_h, old_cr;
 	unsigned long flags;
 	unsigned int baud, quot;
@@ -384,7 +379,7 @@ pl010_set_termios(struct uart_port *port, struct ktermios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	baud = uart_get_baud_rate(port, termios, old, 0, uap->port.uartclk/16); 
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
 	quot = uart_get_divisor(port, baud);
 
 	switch (termios->c_cflag & CSIZE) {
@@ -408,63 +403,63 @@ pl010_set_termios(struct uart_port *port, struct ktermios *termios,
 		if (!(termios->c_cflag & PARODD))
 			lcr_h |= UART01x_LCRH_EPS;
 	}
-	if (uap->port.fifosize > 1)
+	if (port->fifosize > 1)
 		lcr_h |= UART01x_LCRH_FEN;
 
-	spin_lock_irqsave(&uap->port.lock, flags);
+	spin_lock_irqsave(&port->lock, flags);
 
 	/*
 	 * Update the per-port timeout.
 	 */
 	uart_update_timeout(port, termios->c_cflag, baud);
 
-	uap->port.read_status_mask = UART01x_RSR_OE;
+	port->read_status_mask = UART01x_RSR_OE;
 	if (termios->c_iflag & INPCK)
-		uap->port.read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
+		port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 	if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
-		uap->port.read_status_mask |= UART01x_RSR_BE;
+		port->read_status_mask |= UART01x_RSR_BE;
 
 	/*
 	 * Characters to ignore
 	 */
-	uap->port.ignore_status_mask = 0;
+	port->ignore_status_mask = 0;
 	if (termios->c_iflag & IGNPAR)
-		uap->port.ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
+		port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 	if (termios->c_iflag & IGNBRK) {
-		uap->port.ignore_status_mask |= UART01x_RSR_BE;
+		port->ignore_status_mask |= UART01x_RSR_BE;
 		/*
 		 * If we're ignoring parity and break indicators,
 		 * ignore overruns too (for real raw support).
 		 */
 		if (termios->c_iflag & IGNPAR)
-			uap->port.ignore_status_mask |= UART01x_RSR_OE;
+			port->ignore_status_mask |= UART01x_RSR_OE;
 	}
 
 	/*
 	 * Ignore all characters if CREAD is not set.
 	 */
 	if ((termios->c_cflag & CREAD) == 0)
-		uap->port.ignore_status_mask |= UART_DUMMY_RSR_RX;
+		port->ignore_status_mask |= UART_DUMMY_RSR_RX;
 
-	old_cr = readb(uap->port.membase + UART010_CR) & ~UART010_CR_MSIE;
+	old_cr = readb(port->membase + UART010_CR) & ~UART010_CR_MSIE;
 
 	if (UART_ENABLE_MS(port, termios->c_cflag))
 		old_cr |= UART010_CR_MSIE;
 
 	/* Set baud rate */
 	quot -= 1;
-	writel((quot & 0xf00) >> 8, uap->port.membase + UART010_LCRM);
-	writel(quot & 0xff, uap->port.membase + UART010_LCRL);
+	writel((quot & 0xf00) >> 8, port->membase + UART010_LCRM);
+	writel(quot & 0xff, port->membase + UART010_LCRL);
 
 	/*
 	 * ----------v----------v----------v----------v-----
 	 * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
 	 * ----------^----------^----------^----------^-----
 	 */
-	writel(lcr_h, uap->port.membase + UART010_LCRH);
-	writel(old_cr, uap->port.membase + UART010_CR);
+	writel(lcr_h, port->membase + UART010_LCRH);
+	writel(old_cr, port->membase + UART010_CR);
 
-	spin_unlock_irqrestore(&uap->port.lock, flags);
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static void pl010_set_ldisc(struct uart_port *port, struct ktermios *termios)
@@ -558,21 +553,20 @@ static struct uart_amba_port *amba_ports[UART_NR];
 
 static void pl010_console_putchar(struct uart_port *port, unsigned char ch)
 {
-	struct uart_amba_port *uap =
-		container_of(port, struct uart_amba_port, port);
 	unsigned int status;
 
 	do {
-		status = readb(uap->port.membase + UART01x_FR);
+		status = readb(port->membase + UART01x_FR);
 		barrier();
 	} while (!UART_TX_READY(status));
-	writel(ch, uap->port.membase + UART01x_DR);
+	writel(ch, port->membase + UART01x_DR);
 }
 
 static void
 pl010_console_write(struct console *co, const char *s, unsigned int count)
 {
 	struct uart_amba_port *uap = amba_ports[co->index];
+	struct uart_port *port = &uap->port;
 	unsigned int status, old_cr;
 
 	clk_enable(uap->clk);
@@ -580,20 +574,20 @@ pl010_console_write(struct console *co, const char *s, unsigned int count)
 	/*
 	 *	First save the CR then disable the interrupts
 	 */
-	old_cr = readb(uap->port.membase + UART010_CR);
-	writel(UART01x_CR_UARTEN, uap->port.membase + UART010_CR);
+	old_cr = readb(port->membase + UART010_CR);
+	writel(UART01x_CR_UARTEN, port->membase + UART010_CR);
 
-	uart_console_write(&uap->port, s, count, pl010_console_putchar);
+	uart_console_write(port, s, count, pl010_console_putchar);
 
 	/*
 	 *	Finally, wait for transmitter to become empty
 	 *	and restore the TCR
 	 */
 	do {
-		status = readb(uap->port.membase + UART01x_FR);
+		status = readb(port->membase + UART01x_FR);
 		barrier();
 	} while (status & UART01x_FR_BUSY);
-	writel(old_cr, uap->port.membase + UART010_CR);
+	writel(old_cr, port->membase + UART010_CR);
 
 	clk_disable(uap->clk);
 }
-- 
2.35.1

[PATCH 5/5] tty: serial: lpc32xx_hs: use serial_lpc32xx_stop_tx() helper

[Jiri Slaby]

Instead of open-coding what serial_lpc32xx_stop_tx() already does, call
it in __serial_lpc32xx_tx() directly.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/tty/serial/lpc32xx_hs.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index b7b489c68c36..93140cac1ca1 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -276,10 +276,11 @@ static void __serial_lpc32xx_rx(struct uart_port *port)
 	tty_flip_buffer_push(tport);
 }
 
+static void serial_lpc32xx_stop_tx(struct uart_port *port);
+
 static void __serial_lpc32xx_tx(struct uart_port *port)
 {
 	struct circ_buf *xmit = &port->state->xmit;
-	unsigned int tmp;
 
 	if (port->x_char) {
 		writel((u32)port->x_char, LPC32XX_HSUART_FIFO(port->membase));
@@ -306,11 +307,8 @@ static void __serial_lpc32xx_tx(struct uart_port *port)
 		uart_write_wakeup(port);
 
 exit_tx:
-	if (uart_circ_empty(xmit)) {
-		tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
-		tmp &= ~LPC32XX_HSU_TX_INT_EN;
-		writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
-	}
+	if (uart_circ_empty(xmit))
+		serial_lpc32xx_stop_tx(port);
 }
 
 static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
-- 
2.35.1

[PATCH 5/5] tty: serial: lpc32xx_hs: use serial_lpc32xx_stop_tx() helper

[Jiri Slaby]

Instead of open-coding what serial_lpc32xx_stop_tx() already does, call
it in __serial_lpc32xx_tx() directly.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/tty/serial/lpc32xx_hs.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index b7b489c68c36..93140cac1ca1 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -276,10 +276,11 @@ static void __serial_lpc32xx_rx(struct uart_port *port)
 	tty_flip_buffer_push(tport);
 }
 
+static void serial_lpc32xx_stop_tx(struct uart_port *port);
+
 static void __serial_lpc32xx_tx(struct uart_port *port)
 {
 	struct circ_buf *xmit = &port->state->xmit;
-	unsigned int tmp;
 
 	if (port->x_char) {
 		writel((u32)port->x_char, LPC32XX_HSUART_FIFO(port->membase));
@@ -306,11 +307,8 @@ static void __serial_lpc32xx_tx(struct uart_port *port)
 		uart_write_wakeup(port);
 
 exit_tx:
-	if (uart_circ_empty(xmit)) {
-		tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
-		tmp &= ~LPC32XX_HSU_TX_INT_EN;
-		writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
-	}
+	if (uart_circ_empty(xmit))
+		serial_lpc32xx_stop_tx(port);
 }
 
 static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
-- 
2.35.1


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Re: [PATCH 0/5] tty: serial: various cleanups

[Greg KH]

On Thu, Feb 24, 2022 at 12:10:23PM +0100, Jiri Slaby wrote:
> This is a small cleanup series of what I have accumulated over past few
> weeks while doing larger changes.
> 
> Jiri Slaby (5):
>   tty: serial: mpc52xx_uart: make rx/tx hooks return unsigned
>   tty: serial: serial_txx9: remove info print from init
>   tty: serial: serial_txx9: remove struct uart_txx9_port
>   tty: serial: amba-pl010: use more uart_port pointers
>   tty: serial: lpc32xx_hs: use serial_lpc32xx_stop_tx() helper
> 
>  drivers/tty/serial/amba-pl010.c   | 174 +++++++-------
>  drivers/tty/serial/lpc32xx_hs.c   |  10 +-
>  drivers/tty/serial/mpc52xx_uart.c |  22 +-
>  drivers/tty/serial/serial_txx9.c  | 369 ++++++++++++++----------------
>  4 files changed, 266 insertions(+), 309 deletions(-)

Patch 3/6 did not apply to my tree for some reason.  Can you rebase and
resend just that one?

thanks,

greg k-h

Re: [PATCH 1/5] tty: serial: mpc52xx_uart: make rx/tx hooks return unsigned

[Guenter Roeck]

On Thu, Feb 24, 2022 at 12:10:24PM +0100, Jiri Slaby wrote:
> All these return bitmasks, so it makes more sense to return unsigned --
> this is what a reader and also all the callers expect.
> 
> Signed-off-by: Jiri Slaby <jslaby@suse.cz>

With this patch in place:

drivers/tty/serial/mpc52xx_uart.c:static unsigned int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
drivers/tty/serial/mpc52xx_uart.c:static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
                                         ^^^
drivers/tty/serial/mpc52xx_uart.c:static int mpc5125_psc_raw_tx_rdy(struct uart_port *port)
                                         ^^^

Same for other functions. This results in lots of compile errors.

Guenter

> ---
>  drivers/tty/serial/mpc52xx_uart.c | 22 +++++++++++-----------
>  1 file changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
> index 2704dc988e4a..8a6958377764 100644
> --- a/drivers/tty/serial/mpc52xx_uart.c
> +++ b/drivers/tty/serial/mpc52xx_uart.c
> @@ -83,11 +83,11 @@ static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
>  
>  struct psc_ops {
>  	void		(*fifo_init)(struct uart_port *port);
> -	int		(*raw_rx_rdy)(struct uart_port *port);
> -	int		(*raw_tx_rdy)(struct uart_port *port);
> -	int		(*rx_rdy)(struct uart_port *port);
> -	int		(*tx_rdy)(struct uart_port *port);
> -	int		(*tx_empty)(struct uart_port *port);
> +	unsigned int	(*raw_rx_rdy)(struct uart_port *port);
> +	unsigned int	(*raw_tx_rdy)(struct uart_port *port);
> +	unsigned int	(*rx_rdy)(struct uart_port *port);
> +	unsigned int	(*tx_rdy)(struct uart_port *port);
> +	unsigned int	(*tx_empty)(struct uart_port *port);
>  	void		(*stop_rx)(struct uart_port *port);
>  	void		(*start_tx)(struct uart_port *port);
>  	void		(*stop_tx)(struct uart_port *port);
> @@ -203,34 +203,34 @@ static void mpc52xx_psc_fifo_init(struct uart_port *port)
>  	out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
>  }
>  
> -static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
> +static unsigned int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
>  {
>  	return in_be16(&PSC(port)->mpc52xx_psc_status)
>  	    & MPC52xx_PSC_SR_RXRDY;
>  }
>  
> -static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
> +static unsigned int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
>  {
>  	return in_be16(&PSC(port)->mpc52xx_psc_status)
>  	    & MPC52xx_PSC_SR_TXRDY;
>  }
>  
>  
> -static int mpc52xx_psc_rx_rdy(struct uart_port *port)
> +static unsigned int mpc52xx_psc_rx_rdy(struct uart_port *port)
>  {
>  	return in_be16(&PSC(port)->mpc52xx_psc_isr)
>  	    & port->read_status_mask
>  	    & MPC52xx_PSC_IMR_RXRDY;
>  }
>  
> -static int mpc52xx_psc_tx_rdy(struct uart_port *port)
> +static unsigned int mpc52xx_psc_tx_rdy(struct uart_port *port)
>  {
>  	return in_be16(&PSC(port)->mpc52xx_psc_isr)
>  	    & port->read_status_mask
>  	    & MPC52xx_PSC_IMR_TXRDY;
>  }
>  
> -static int mpc52xx_psc_tx_empty(struct uart_port *port)
> +static unsigned int mpc52xx_psc_tx_empty(struct uart_port *port)
>  {
>  	u16 sts = in_be16(&PSC(port)->mpc52xx_psc_status);
>  
> @@ -1365,7 +1365,7 @@ static const struct uart_ops mpc52xx_uart_ops = {
>  /* Interrupt handling                                                       */
>  /* ======================================================================== */
>  
> -static inline int
> +static inline unsigned int
>  mpc52xx_uart_int_rx_chars(struct uart_port *port)
>  {
>  	struct tty_port *tport = &port->state->port;
> -- 
> 2.35.1
>