From: Jiri Slaby <jslaby@suse.cz>
To: gregkh@linuxfoundation.org
Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
Jiri Slaby <jslaby@suse.cz>, Tobias Klauser <tklauser@distanz.ch>
Subject: [PATCH 3/4] tty: serial: unify TX space reads under altera_jtaguart_tx_space()
Date: Tue, 27 Sep 2022 13:18:18 +0200 [thread overview]
Message-ID: <20220927111819.18516-3-jslaby@suse.cz> (raw)
In-Reply-To: <20220927111819.18516-1-jslaby@suse.cz>
TX space reads from the control register are performed in various forms
on 4 places in altera_jtaguart. Unify all those and do the read and
masking on a single place.
The new helper altera_jtaguart_tx_space() uses FIELD_GET(), so we can
drop ALTERA_JTAGUART_CONTROL_WSPACE_OFF now.
Cc: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/tty/serial/altera_jtaguart.c | 27 ++++++++++++++++-----------
1 file changed, 16 insertions(+), 11 deletions(-)
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index 23f339757894..ac8ce418de36 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -9,6 +9,7 @@
* (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch>
*/
+#include <linux/bitfield.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
@@ -48,7 +49,6 @@
#define ALTERA_JTAGUART_CONTROL_WI_MSK 0x00000200
#define ALTERA_JTAGUART_CONTROL_AC_MSK 0x00000400
#define ALTERA_JTAGUART_CONTROL_WSPACE_MSK 0xFFFF0000
-#define ALTERA_JTAGUART_CONTROL_WSPACE_OFF 16
/*
* Local per-uart structure.
@@ -59,10 +59,19 @@ struct altera_jtaguart {
unsigned long imr; /* Local IMR mirror */
};
+static unsigned int altera_jtaguart_tx_space(struct uart_port *port, u32 *ctlp)
+{
+ u32 ctl = readl(port->membase + ALTERA_JTAGUART_CONTROL_REG);
+
+ if (ctlp)
+ *ctlp = ctl;
+
+ return FIELD_GET(ALTERA_JTAGUART_CONTROL_WSPACE_MSK, ctl);
+}
+
static unsigned int altera_jtaguart_tx_empty(struct uart_port *port)
{
- return (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) &
- ALTERA_JTAGUART_CONTROL_WSPACE_MSK) ? TIOCSER_TEMT : 0;
+ return altera_jtaguart_tx_space(port, NULL) ? TIOCSER_TEMT : 0;
}
static unsigned int altera_jtaguart_get_mctrl(struct uart_port *port)
@@ -150,9 +159,7 @@ static void altera_jtaguart_tx_chars(struct altera_jtaguart *pp)
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;
+ count = altera_jtaguart_tx_space(port, NULL);
if (count > pending)
count = pending;
if (count > 0) {
@@ -298,12 +305,11 @@ static struct altera_jtaguart altera_jtaguart_ports[ALTERA_JTAGUART_MAXPORTS];
#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
static void altera_jtaguart_console_putc(struct uart_port *port, unsigned char c)
{
- unsigned long status;
unsigned long flags;
+ u32 status;
spin_lock_irqsave(&port->lock, flags);
- while (((status = readl(port->membase + ALTERA_JTAGUART_CONTROL_REG)) &
- ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0) {
+ while (!altera_jtaguart_tx_space(port, &status)) {
if ((status & ALTERA_JTAGUART_CONTROL_AC_MSK) == 0) {
spin_unlock_irqrestore(&port->lock, flags);
return; /* no connection activity */
@@ -321,8 +327,7 @@ static void altera_jtaguart_console_putc(struct uart_port *port, unsigned char c
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
- while ((readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) &
- ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0) {
+ while (!altera_jtaguart_tx_space(port, NULL)) {
spin_unlock_irqrestore(&port->lock, flags);
cpu_relax();
spin_lock_irqsave(&port->lock, flags);
--
2.37.3
next prev parent reply other threads:[~2022-09-27 11:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-27 11:18 [PATCH 1/4] tty: serial: extend lqasc_tx_ready() to lqasc_console_putchar() Jiri Slaby
2022-09-27 11:18 ` [PATCH 2/4] tty: serial: use FIELD_GET() in lqasc_tx_ready() Jiri Slaby
2022-09-27 11:48 ` Ilpo Järvinen
2022-09-27 11:18 ` Jiri Slaby [this message]
2022-09-27 15:04 ` [PATCH 3/4] tty: serial: unify TX space reads under altera_jtaguart_tx_space() Tobias Klauser
2022-09-28 10:26 ` Ilpo Järvinen
2022-09-27 11:18 ` [PATCH 4/4] tty: serial: do unlock on a common path in altera_jtaguart_console_putc() Jiri Slaby
2022-09-27 14:59 ` Tobias Klauser
2022-09-28 10:27 ` Ilpo Järvinen
2022-09-27 11:47 ` [PATCH 1/4] tty: serial: extend lqasc_tx_ready() to lqasc_console_putchar() Ilpo Järvinen
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