From patchwork Wed Jul 16 14:45:01 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Andrzej Siewior X-Patchwork-Id: 4567761 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 56020C0515 for ; Wed, 16 Jul 2014 14:48:14 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 850DD201CD for ; Wed, 16 Jul 2014 14:48:13 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BD089201B9 for ; Wed, 16 Jul 2014 14:48:12 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1X7QTJ-00061o-2Q; Wed, 16 Jul 2014 14:46:17 +0000 Received: from galois.linutronix.de ([2001:470:1f0b:db:abcd:42:0:1]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1X7QSe-0005YC-KC for linux-arm-kernel@lists.infradead.org; Wed, 16 Jul 2014 14:45:38 +0000 Received: from localhost ([127.0.0.1] helo=bazinga.breakpoint.cc) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1X7QSF-0000DT-4s; Wed, 16 Jul 2014 16:45:11 +0200 From: Sebastian Andrzej Siewior To: linux-omap@vger.kernel.org Subject: [PATCH 3/5] tty: serial: 8250 core: allow to set ->throttle / ->unthrottle callbacks Date: Wed, 16 Jul 2014 16:45:01 +0200 Message-Id: <1405521903-5877-4-git-send-email-bigeasy@linutronix.de> X-Mailer: git-send-email 2.0.1 In-Reply-To: <1405521903-5877-1-git-send-email-bigeasy@linutronix.de> References: <1405521903-5877-1-git-send-email-bigeasy@linutronix.de> X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1, SHORTCIRCUIT=-0.0001 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140716_074536_857293_0659724F X-CRM114-Status: GOOD ( 10.88 ) X-Spam-Score: -0.0 (/) Cc: Tony Lindgren , Greg Kroah-Hartman , Sebastian Andrzej Siewior , linux-kernel@vger.kernel.org, Felipe Balbi , linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The omap uart provides support for HW assisted flow control. What is missing is the support to throttle / unthrottle callbacks which are used by the omap-serial driver at the moment. This patch adds the callbacks. It should be safe to add them since they are only invovked from the serial_core (uart_throttle()) if the feature flags are set. Signed-off-by: Sebastian Andrzej Siewior --- drivers/tty/serial/8250/8250_core.c | 14 ++++++++++++++ include/linux/serial_core.h | 2 ++ 2 files changed, 16 insertions(+) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index bd0e1897..714f954 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -1320,6 +1320,16 @@ static void serial8250_start_tx(struct uart_port *port) } } +static void serial8250_throttle(struct uart_port *port) +{ + port->throttle(port); +} + +static void serial8250_unthrottle(struct uart_port *port) +{ + port->unthrottle(port); +} + static void serial8250_stop_rx(struct uart_port *port) { struct uart_8250_port *up = @@ -2752,6 +2762,8 @@ static struct uart_ops serial8250_pops = { .get_mctrl = serial8250_get_mctrl, .stop_tx = serial8250_stop_tx, .start_tx = serial8250_start_tx, + .throttle = serial8250_throttle, + .unthrottle = serial8250_unthrottle, .stop_rx = serial8250_stop_rx, .enable_ms = serial8250_enable_ms, .break_ctl = serial8250_break_ctl, @@ -3300,6 +3312,8 @@ int serial8250_register_8250_port(struct uart_8250_port *up) uart->port.fifosize = up->port.fifosize; uart->tx_loadsz = up->tx_loadsz; uart->capabilities = up->capabilities; + uart->port.throttle = up->port.throttle; + uart->port.unthrottle = up->port.unthrottle; /* Take tx_loadsz from fifosize if it wasn't set separately */ if (uart->port.fifosize && !uart->tx_loadsz) diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 6f20ff0..c380af2 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -124,6 +124,8 @@ struct uart_port { struct ktermios *old); int (*startup)(struct uart_port *port); void (*shutdown)(struct uart_port *port); + void (*throttle)(struct uart_port *port); + void (*unthrottle)(struct uart_port *port); int (*handle_irq)(struct uart_port *); void (*pm)(struct uart_port *, unsigned int state, unsigned int old);