From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: linux-serial@vger.kernel.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>,
Stefan Agner <stefan@agner.ch>,
Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>,
Chris Healy <cphealy@gmail.com>, Cory Tusar <cory.tusar@zii.aero>,
Lucas Stach <l.stach@pengutronix.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
linux-imx@nxp.com, linux-kernel@vger.kernel.org
Subject: [PATCH 09/24] tty: serial: fls_lpuart: Split shared TX IRQ handler into two
Date: Mon, 29 Jul 2019 12:52:11 -0700 [thread overview]
Message-ID: <20190729195226.8862-10-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20190729195226.8862-1-andrew.smirnov@gmail.com>
While sharing code for Tx interrupt handler between 8 and 32 bit
variant of the peripheral saves a bit of code duplication it also adds
quite a number of lpuart_is_32() checks which makes it harder to
understand. Move shared bits back into corresponding
lpuart*_transmit_buffer functions, split lpuart_txint into
lpuart_txint and lpuart32_txint so we can drop all extra
lpuart_is_32() check and make the code flow more linear.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Cory Tusar <cory.tusar@zii.aero>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-imx@nxp.com
Cc: linux-serial@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
drivers/tty/serial/fsl_lpuart.c | 61 +++++++++++++++++++--------------
1 file changed, 35 insertions(+), 26 deletions(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 1fe9b1b29a46..f87ea889ff86 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -662,6 +662,18 @@ static inline void lpuart_transmit_buffer(struct lpuart_port *sport)
{
struct circ_buf *xmit = &sport->port.state->xmit;
+ if (sport->port.x_char) {
+ writeb(sport->port.x_char, sport->port.membase + UARTDR);
+ sport->port.icount.tx++;
+ sport->port.x_char = 0;
+ return;
+ }
+
+ if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
+ lpuart_stop_tx(&sport->port);
+ return;
+ }
+
while (!uart_circ_empty(xmit) &&
(readb(sport->port.membase + UARTTCFIFO) < sport->txfifo_size)) {
writeb(xmit->buf[xmit->tail], sport->port.membase + UARTDR);
@@ -681,6 +693,18 @@ static inline void lpuart32_transmit_buffer(struct lpuart_port *sport)
struct circ_buf *xmit = &sport->port.state->xmit;
unsigned long txcnt;
+ if (sport->port.x_char) {
+ lpuart32_write(&sport->port, sport->port.x_char, UARTDATA);
+ sport->port.icount.tx++;
+ sport->port.x_char = 0;
+ return;
+ }
+
+ if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
+ lpuart32_stop_tx(&sport->port);
+ return;
+ }
+
txcnt = lpuart32_read(&sport->port, UARTWATER);
txcnt = txcnt >> UARTWATER_TXCNT_OFF;
txcnt &= UARTWATER_COUNT_MASK;
@@ -772,34 +796,10 @@ static unsigned int lpuart32_tx_empty(struct uart_port *port)
static void lpuart_txint(struct lpuart_port *sport)
{
- struct circ_buf *xmit = &sport->port.state->xmit;
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
- if (sport->port.x_char) {
- if (lpuart_is_32(sport))
- lpuart32_write(&sport->port, sport->port.x_char, UARTDATA);
- else
- writeb(sport->port.x_char, sport->port.membase + UARTDR);
- sport->port.icount.tx++;
- sport->port.x_char = 0;
- goto out;
- }
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
- if (lpuart_is_32(sport))
- lpuart32_stop_tx(&sport->port);
- else
- lpuart_stop_tx(&sport->port);
- goto out;
- }
-
- if (lpuart_is_32(sport))
- lpuart32_transmit_buffer(sport);
- else
- lpuart_transmit_buffer(sport);
-
-out:
+ lpuart_transmit_buffer(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
@@ -875,6 +875,15 @@ static void lpuart_rxint(struct lpuart_port *sport)
tty_flip_buffer_push(port);
}
+static void lpuart32_txint(struct lpuart_port *sport)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sport->port.lock, flags);
+ lpuart32_transmit_buffer(sport);
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
static void lpuart32_rxint(struct lpuart_port *sport)
{
unsigned int flg, ignored = 0;
@@ -966,7 +975,7 @@ static irqreturn_t lpuart32_int(int irq, void *dev_id)
lpuart32_rxint(sport);
if ((sts & UARTSTAT_TDRE) && !sport->lpuart_dma_tx_use)
- lpuart_txint(sport);
+ lpuart32_txint(sport);
lpuart32_write(&sport->port, sts, UARTSTAT);
return IRQ_HANDLED;
--
2.21.0
next prev parent reply other threads:[~2019-07-29 19:53 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-29 19:52 [PATCH 00/24] LPUART fixes and improvements Andrey Smirnov
2019-07-29 19:52 ` [PATCH 01/24] tty: serial: fsl_lpuart: fix framing error handling when using DMA Andrey Smirnov
2019-07-29 19:52 ` [PATCH 02/24] tty: serial: fsl_lpuart: flush receive FIFO after overruns Andrey Smirnov
2019-07-29 19:52 ` [PATCH 03/24] tty: serial: fsl_lpuart: Flush HW FIFOs in .flush_buffer Andrey Smirnov
2019-07-29 19:52 ` [PATCH 04/24] tty: serial: fsl_lpuart: Simplify RX/TX IRQ handlers Andrey Smirnov
2019-07-29 19:52 ` [PATCH 05/24] tty: serial: fsl_lpuart: Fix bogus indentation Andrey Smirnov
2019-07-29 19:52 ` [PATCH 06/24] tty: serial: fsl_lpuart: Drop unnecessary sg_set_buf() call Andrey Smirnov
2019-07-30 15:51 ` Greg Kroah-Hartman
2019-07-31 2:08 ` Andrey Smirnov
2019-07-29 19:52 ` [PATCH 07/24] tty: serial: fsl_lpuart: Drop unnecessary uart_write_wakeup() Andrey Smirnov
2019-07-29 19:52 ` [PATCH 08/24] tty: serial: fsl_lpuart: Fix issue in software flow control Andrey Smirnov
2019-07-29 19:52 ` Andrey Smirnov [this message]
2019-07-29 19:52 ` [PATCH 10/24] tty: serial: fsl_lpuart: Drop no-op bit opearation Andrey Smirnov
2019-07-29 19:52 ` [PATCH 11/24] tty: serial: fsl_lpuart: Drop unnecessary extra parenthesis Andrey Smirnov
2019-07-29 19:52 ` [PATCH 12/24] tty: serial: fsl_lpuart: Clear CSTOPB unconditionally Andrey Smirnov
2019-07-29 19:52 ` [PATCH 13/24] tty: serial: fsl_lpuart: Use appropriate lpuart32_* I/O funcs Andrey Smirnov
2019-07-29 19:52 ` [PATCH 14/24] tty: serial: fsl_lpuart: Introduce lpuart_wait_bit_set() Andrey Smirnov
2019-07-29 19:52 ` [PATCH 15/24] tty: serial: fsl_lpuart: Use cpu_relax() instead of barrier() Andrey Smirnov
2019-07-29 19:52 ` [PATCH 16/24] tty: serial: fsl_lpuart: Introduce lpuart_stopped_or_empty() Andrey Smirnov
2019-07-29 19:52 ` [PATCH 17/24] tty: serial: fsl_lpuart: Drop unnecessary lpuart*_stop_tx() Andrey Smirnov
2019-07-29 19:52 ` [PATCH 18/24] tty: serial: fsl_lpuart: Introduce lpuart_dma_shutdown() Andrey Smirnov
2019-07-29 19:52 ` [PATCH 19/24] tty: serial: fsl_lpuart: Introduce lpuart_tx_dma_startup() Andrey Smirnov
2019-07-30 15:56 ` Greg Kroah-Hartman
2019-07-31 2:09 ` Andrey Smirnov
2019-07-29 19:52 ` [PATCH 20/24] tty: serial: fsl_lpuart: Introduce lpuart_rx_dma_startup() Andrey Smirnov
2019-07-29 19:52 ` [PATCH 21/24] tty: serial: fsl_lpuart: Introduce lpuart32_configure() Andrey Smirnov
2019-07-29 19:52 ` [PATCH 22/24] tty: serial: fsl_lpuart: Introduce lpuart*_setup_watermark_enable() Andrey Smirnov
2019-07-29 19:52 ` [PATCH 23/24] tty: serial: fsl_lpuart: Don't enable TIE in .startup() or .resume() Andrey Smirnov
2019-07-29 19:52 ` [PATCH 24/24] tty: serial: fsl_lpuart: Ignore TX/RX interrupts if DMA is enabled Andrey Smirnov
2019-07-30 15:53 ` [PATCH 00/24] LPUART fixes and improvements Greg Kroah-Hartman
2019-07-30 15:54 ` Greg Kroah-Hartman
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