linux-kernel - [PATCH v2 13/23] tty: serial: fsl_lpuart: Introduce lpuart_wait_bit

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Message-Id: <20190731173045.11718-14-andrew.smirnov@gmail.com>
Date:   Wed, 31 Jul 2019 10:30:35 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     linux-serial@...r.kernel.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Stefan Agner <stefan@...er.ch>,
        Chris Healy <cphealy@...il.com>,
        Cory Tusar <cory.tusar@....aero>,
        Lucas Stach <l.stach@...gutronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-imx@....com,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 13/23] tty: serial: fsl_lpuart: Introduce lpuart_wait_bit_set()

Busy polling on a bit in a register is used in multiple places in the
driver. Move it into a shared function.

Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: Stefan Agner <stefan@...er.ch>
Cc: Chris Healy <cphealy@...il.com>
Cc: Cory Tusar <cory.tusar@....aero>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.com>
Cc: linux-imx@....com
Cc: linux-serial@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/tty/serial/fsl_lpuart.c | 42 +++++++++++++++++----------------
 1 file changed, 22 insertions(+), 20 deletions(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 395df8c7e1d5..eb748ef85da7 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -549,6 +549,20 @@ static void lpuart_flush_buffer(struct uart_port *port)
 	}
 }
 
+static void lpuart_wait_bit_set(struct uart_port *port, unsigned int offset,
+				u8 bit)
+{
+	while (!(readb(port->membase + offset) & bit))
+		barrier();
+}
+
+static void lpuart32_wait_bit_set(struct uart_port *port, unsigned int offset,
+				  u32 bit)
+{
+	while (!(lpuart32_read(port, offset) & bit))
+		barrier();
+}
+
 #if defined(CONFIG_CONSOLE_POLL)
 
 static int lpuart_poll_init(struct uart_port *port)
@@ -592,9 +606,7 @@ static int lpuart_poll_init(struct uart_port *port)
 static void lpuart_poll_put_char(struct uart_port *port, unsigned char c)
 {
 	/* drain */
-	while (!(readb(port->membase + UARTSR1) & UARTSR1_TDRE))
-		barrier();
-
+	lpuart_wait_bit_set(port, UARTSR1, UARTSR1_TDRE);
 	writeb(c, port->membase + UARTDR);
 }
 
@@ -644,9 +656,7 @@ static int lpuart32_poll_init(struct uart_port *port)
 
 static void lpuart32_poll_put_char(struct uart_port *port, unsigned char c)
 {
-	while (!(lpuart32_read(port, UARTSTAT) & UARTSTAT_TDRE))
-		barrier();
-
+	lpuart32_wait_bit_set(port, UARTSTAT, UARTSTAT_TDRE);
 	lpuart32_write(port, UARTDATA, c);
 }
 
@@ -1722,8 +1732,7 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
 	uart_update_timeout(port, termios->c_cflag, baud);
 
 	/* wait transmit engin complete */
-	while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
-		barrier();
+	lpuart_wait_bit_set(&sport->port, UARTSR1, UARTSR1_TC);
 
 	/* disable transmit and receive */
 	writeb(old_cr2 & ~(UARTCR2_TE | UARTCR2_RE),
@@ -1938,8 +1947,7 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
 	uart_update_timeout(port, termios->c_cflag, baud);
 
 	/* wait transmit engin complete */
-	while (!(lpuart32_read(&sport->port, UARTSTAT) & UARTSTAT_TC))
-		barrier();
+	lpuart32_wait_bit_set(&sport->port, UARTSTAT, UARTSTAT_TC);
 
 	/* disable transmit and receive */
 	lpuart32_write(&sport->port, old_ctrl & ~(UARTCTRL_TE | UARTCTRL_RE),
@@ -2054,17 +2062,13 @@ static struct lpuart_port *lpuart_ports[UART_NR];
 #ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE
 static void lpuart_console_putchar(struct uart_port *port, int ch)
 {
-	while (!(readb(port->membase + UARTSR1) & UARTSR1_TDRE))
-		barrier();
-
+	lpuart_wait_bit_set(port, UARTSR1, UARTSR1_TDRE);
 	writeb(ch, port->membase + UARTDR);
 }
 
 static void lpuart32_console_putchar(struct uart_port *port, int ch)
 {
-	while (!(lpuart32_read(port, UARTSTAT) & UARTSTAT_TDRE))
-		barrier();
-
+	lpuart32_wait_bit_set(port, UARTSTAT, UARTSTAT_TDRE);
 	lpuart32_write(port, ch, UARTDATA);
 }
 
@@ -2090,8 +2094,7 @@ lpuart_console_write(struct console *co, const char *s, unsigned int count)
 	uart_console_write(&sport->port, s, count, lpuart_console_putchar);
 
 	/* wait for transmitter finish complete and restore CR2 */
-	while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
-		barrier();
+	lpuart_wait_bit_set(&sport->port, UARTSR1, UARTSR1_TC);
 
 	writeb(old_cr2, sport->port.membase + UARTCR2);
 
@@ -2121,8 +2124,7 @@ lpuart32_console_write(struct console *co, const char *s, unsigned int count)
 	uart_console_write(&sport->port, s, count, lpuart32_console_putchar);
 
 	/* wait for transmitter finish complete and restore CR2 */
-	while (!(lpuart32_read(&sport->port, UARTSTAT) & UARTSTAT_TC))
-		barrier();
+	lpuart32_wait_bit_set(&sport->port, UARTSTAT, UARTSTAT_TC);
 
 	lpuart32_write(&sport->port, old_cr, UARTCTRL);
 
-- 
2.21.0