From patchwork Tue Oct 4 10:49:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jiri Slaby X-Patchwork-Id: 12998136 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6B238C43217 for ; Tue, 4 Oct 2022 10:49:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=IfL5IrewD8sV8kuKr2m3tmn98sYzVctPWOA82an3jLI=; b=xPZ2nuVZtg3hHI RpfkHnW6SUDXnGhUOomntDXfeUuLLkici1VktYLROcnVjLaO6zmTL49nbBatfwbdLLK0ttBbrFB4p uWY5sLKp1FbohnzWFCWXrvFJnat+o/zkaeUlUTHoDsh4KmUEs7N99vLi6eW0nXybltAP6zr2c8dW4 L3jhYGVtCUyj1sJlr9+2OQgNR59hwMMWmV8rVi7sHv+AyHLNrozLc+lOVKMBSOF4rjRIgEQkoe3CG UT0W3iuP+i2ZZYkTMS+80tWIvRDfN7o5jb/Vgxvsp/2tBJ86OSt2haXIUwdeYEfm4iVu6KUKPZm0T LFtdWqKPuC0LWmhDox3w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1offUi-009Pvt-AC; Tue, 04 Oct 2022 10:49:48 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1offUe-009PuB-9C for linux-riscv@lists.infradead.org; Tue, 04 Oct 2022 10:49:46 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0F47F61353; Tue, 4 Oct 2022 10:49:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6BAE2C4347C; Tue, 4 Oct 2022 10:49:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1664880581; bh=EiG7MLXpt/ieQf/scjf2AjsAsALEw0iDo5jOA5XLK1o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PuVLtqtDLOT35uK/LKnFhKdO0kypUV5cjbuQpI1HoAo/jyjXpt0+wXMugbV9m+DH1 rtjsLiAd/QPE3wrlBKsAgA8c8fLOQpgmoth5DWgiQddc779ITsKE5MbOjL9jis3Gus e+zgNVycSJbIax0Fzpu4RqkALLumzUjWKLO+R421G5GgutWK7Ut7RKt5NKPKhZu/S2 BhXtJdVBlmMNHO5szSGb0i8jYIJaMtJvXSgif7/EcdNG2iKkegj7VbXe2SgmVKkcY5 Lk6y5yk4YHUikyo2kUJ77MEAzmivbFTC3NEHc5Swhicqze11ubW4qA/2Qh1Tb1NPA8 YhVI37WXg8xTA== From: "Jiri Slaby (SUSE)" To: gregkh@linuxfoundation.org Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, "Jiri Slaby (SUSE)" , Russell King , Florian Fainelli , bcm-kernel-feedback-list@broadcom.com, =?utf-8?q?Pali_Roh=C3=A1r?= , Kevin Cernekee , Palmer Dabbelt , Paul Walmsley , Orson Zhai , Baolin Wang , Chunyan Zhang , Patrice Chotard , linux-riscv@lists.infradead.org Subject: [PATCH v5 3/3] tty: serial: use uart_port_tx_limited() Date: Tue, 4 Oct 2022 12:49:27 +0200 Message-Id: <20221004104927.14361-4-jirislaby@kernel.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221004104927.14361-1-jirislaby@kernel.org> References: <20221004104927.14361-1-jirislaby@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221004_034944_442154_46F0DA9D X-CRM114-Status: GOOD ( 20.88 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org uart_port_tx_limited() is a new helper to send characters to the device. Use it in these drivers. 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. Cc: Russell King Cc: Florian Fainelli Cc: bcm-kernel-feedback-list@broadcom.com Cc: "Pali Rohár" Cc: Kevin Cernekee Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Orson Zhai Cc: Baolin Wang Cc: Chunyan Zhang Cc: Patrice Chotard Cc: linux-riscv@lists.infradead.org Signed-off-by: Jiri Slaby (SUSE) Reviewed-by: Ilpo Järvinen --- Notes: [v4] switch from DEFINE_UART_PORT_TX_HELPER_LIMITED() (helper generator) to uart_port_tx_limited() (akin to wait_event()) drivers/tty/serial/21285.c | 32 +++---------------- drivers/tty/serial/altera_jtaguart.c | 36 ++++----------------- drivers/tty/serial/amba-pl010.c | 32 +++---------------- drivers/tty/serial/apbuart.c | 34 +++----------------- drivers/tty/serial/bcm63xx_uart.c | 47 ++++++--------------------- drivers/tty/serial/mux.c | 45 ++++++++------------------ drivers/tty/serial/mvebu-uart.c | 38 +++------------------- drivers/tty/serial/omap-serial.c | 32 +++---------------- drivers/tty/serial/pxa.c | 33 +++---------------- drivers/tty/serial/rp2.c | 31 ++++-------------- drivers/tty/serial/serial_txx9.c | 32 +++---------------- drivers/tty/serial/sifive.c | 31 +++--------------- drivers/tty/serial/sprd_serial.c | 33 +++---------------- drivers/tty/serial/st-asc.c | 48 +++------------------------- 14 files changed, 85 insertions(+), 419 deletions(-) diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c index c7d34823f715..185462fd959c 100644 --- a/drivers/tty/serial/21285.c +++ b/drivers/tty/serial/21285.c @@ -154,35 +154,13 @@ 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); + u8 ch; - if (uart_circ_empty(xmit)) - serial21285_stop_tx(port); + uart_port_tx_limited(port, ch, 256, + !(*CSR_UARTFLG & 0x20), + *CSR_UARTDR = ch, + ({})); - out: return IRQ_HANDLED; } diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c index c2d154d78e54..aa49553fac58 100644 --- a/drivers/tty/serial/altera_jtaguart.c +++ b/drivers/tty/serial/altera_jtaguart.c @@ -146,37 +146,15 @@ 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; - } + unsigned int count; + u8 ch; - pending = uart_circ_chars_pending(xmit); - if (pending > 0) { - count = altera_jtaguart_tx_space(port, NULL); - 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); - } - } + count = altera_jtaguart_tx_space(port, NULL); - if (pending == 0) - altera_jtaguart_stop_tx(port); + uart_port_tx_limited(port, ch, count, + true, + writel(ch, port->membase + ALTERA_JTAGUART_DATA_REG), + ({})); } static irqreturn_t altera_jtaguart_interrupt(int irq, void *data) diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c index af27fb8ec145..a98fae2ca422 100644 --- a/drivers/tty/serial/amba-pl010.c +++ b/drivers/tty/serial/amba-pl010.c @@ -164,34 +164,12 @@ static void pl010_rx_chars(struct uart_port *port) static void pl010_tx_chars(struct uart_port *port) { - struct circ_buf *xmit = &port->state->xmit; - int count; + u8 ch; - 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); + uart_port_tx_limited(port, ch, port->fifosize >> 1, + true, + writel(ch, port->membase + UART01x_DR), + ({})); } static void pl010_modem_status(struct uart_amba_port *uap) diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c index 450f4edfda0f..915ee4b0d594 100644 --- a/drivers/tty/serial/apbuart.c +++ b/drivers/tty/serial/apbuart.c @@ -122,36 +122,12 @@ 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); + u8 ch; - if (uart_circ_empty(xmit)) - apbuart_stop_tx(port); + uart_port_tx_limited(port, ch, port->fifosize >> 1, + true, + UART_PUT_CHAR(port, ch), + ({})); } static irqreturn_t apbuart_int(int irq, void *dev_id) diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c index 5d9737c2d1f2..62bc7244dc67 100644 --- a/drivers/tty/serial/bcm63xx_uart.c +++ b/drivers/tty/serial/bcm63xx_uart.c @@ -303,53 +303,24 @@ 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; + bool pending; + u8 ch; 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_limited(port, ch, port->fifosize - val, + true, + bcm_uart_writel(port, ch, UART_FIFO_REG), + ({})); + 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; } /* diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c index ed0e763f622a..85ce1e9af44a 100644 --- a/drivers/tty/serial/mux.c +++ b/drivers/tty/serial/mux.c @@ -171,6 +171,13 @@ static void mux_break_ctl(struct uart_port *port, int break_state) { } +static void mux_tx_done(struct uart_port *port) +{ + /* FIXME js: really needs to wait? */ + while (UART_GET_FIFO_CNT(port)) + udelay(1); +} + /** * mux_write - Write chars to the mux fifo. * @port: Ptr to the uart_port. @@ -180,39 +187,13 @@ 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); + u8 ch; - if (uart_circ_empty(xmit)) - mux_stop_tx(port); + uart_port_tx_limited(port, ch, + port->fifosize - UART_GET_FIFO_CNT(port), + true, + UART_PUT_CHAR(port, ch), + mux_tx_done(port)); } /** diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index ba16e1da6bd3..7b566404cb33 100644 --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -335,40 +335,12 @@ 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); + u8 ch; - if (uart_circ_empty(xmit)) - mvebu_uart_stop_tx(port); + uart_port_tx_limited(port, ch, port->fifosize, + !(readl(port->membase + UART_STAT) & STAT_TX_FIFO_FUL), + writel(ch, port->membase + UART_TSH(port)), + ({})); } static irqreturn_t mvebu_uart_isr(int irq, void *dev_id) diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index 7d0d2718ef59..82d35dbbfa6c 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -347,34 +347,12 @@ static void serial_omap_put_char(struct uart_omap_port *up, unsigned char ch) static void transmit_chars(struct uart_omap_port *up, unsigned int lsr) { - struct circ_buf *xmit = &up->port.state->xmit; - int count; + u8 ch; - if (up->port.x_char) { - serial_omap_put_char(up, 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_omap_stop_tx(&up->port); - return; - } - count = up->port.fifosize / 4; - do { - serial_omap_put_char(up, 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_omap_stop_tx(&up->port); + uart_port_tx_limited(&up->port, ch, up->port.fifosize / 4, + true, + serial_omap_put_char(up, ch), + ({})); } static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up) diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c index 2d25231fad84..444fa4b654ac 100644 --- a/drivers/tty/serial/pxa.c +++ b/drivers/tty/serial/pxa.c @@ -174,35 +174,12 @@ static inline void receive_chars(struct uart_pxa_port *up, int *status) static void transmit_chars(struct uart_pxa_port *up) { - struct circ_buf *xmit = &up->port.state->xmit; - int count; + u8 ch; - 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); + uart_port_tx_limited(&up->port, ch, up->port.fifosize / 2, + true, + serial_out(up, UART_TX, ch), + ({})); } static void serial_pxa_start_tx(struct uart_port *port) diff --git a/drivers/tty/serial/rp2.c b/drivers/tty/serial/rp2.c index b81afb06f1f4..749b873a5d99 100644 --- a/drivers/tty/serial/rp2.c +++ b/drivers/tty/serial/rp2.c @@ -427,32 +427,13 @@ 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; + u8 ch; - 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_limited(&up->port, ch, + FIFO_SIZE - readw(up->base + RP2_TX_FIFO_COUNT), + true, + writeb(ch, up->base + RP2_DATA_BYTE), + ({})); } static void rp2_ch_interrupt(struct rp2_uart_port *up) diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c index e12f1dc18c38..eab387b01e36 100644 --- a/drivers/tty/serial/serial_txx9.c +++ b/drivers/tty/serial/serial_txx9.c @@ -321,34 +321,12 @@ receive_chars(struct uart_port *up, unsigned int *status) static inline void transmit_chars(struct uart_port *up) { - struct circ_buf *xmit = &up->state->xmit; - int count; + u8 ch; - 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); + uart_port_tx_limited(up, ch, TXX9_SIO_TX_FIFO, + true, + sio_out(up, TXX9_SITFIFO, ch), + ({})); } static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id) diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c index 7fb6760b5c37..1f565a216e74 100644 --- a/drivers/tty/serial/sifive.c +++ b/drivers/tty/serial/sifive.c @@ -288,33 +288,12 @@ static void __ssp_transmit_char(struct sifive_serial_port *ssp, int ch) */ 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); + u8 ch; - if (uart_circ_empty(xmit)) - sifive_serial_stop_tx(&ssp->port); + uart_port_tx_limited(&ssp->port, ch, SIFIVE_TX_FIFO_DEPTH, + true, + __ssp_transmit_char(ssp, ch), + ({})); } /** diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c index 342a87967631..3f34f7bb7700 100644 --- a/drivers/tty/serial/sprd_serial.c +++ b/drivers/tty/serial/sprd_serial.c @@ -626,35 +626,12 @@ static inline void sprd_rx(struct uart_port *port) 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); + u8 ch; - if (uart_circ_empty(xmit)) - sprd_stop_tx(port); + uart_port_tx_limited(port, ch, THLD_TX_EMPTY, + true, + serial_out(port, SPRD_TXD, ch), + ({})); } /* this handles the interrupt from one port */ diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c index fcecea689a0d..5215e6910f68 100644 --- a/drivers/tty/serial/st-asc.c +++ b/drivers/tty/serial/st-asc.c @@ -237,50 +237,12 @@ 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); + u8 ch; - if (uart_circ_empty(xmit)) - asc_disable_tx_interrupts(port); + uart_port_tx_limited(port, ch, asc_hw_txroom(port), + true, + asc_out(port, ASC_TXBUF, ch), + ({})); } static void asc_receive_chars(struct uart_port *port)