From patchwork Wed Mar 2 02:49:09 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Andreas_F=C3=A4rber?= X-Patchwork-Id: 8477821 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 [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8A24BC0553 for ; Wed, 2 Mar 2016 02:51:17 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AD4CB20373 for ; Wed, 2 Mar 2016 02:51:16 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 83A0E2035E for ; Wed, 2 Mar 2016 02:51:15 +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 1aawr7-0005yA-5S; Wed, 02 Mar 2016 02:49:41 +0000 Received: from mx2.suse.de ([195.135.220.15]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aawr3-0005wn-Vu for linux-arm-kernel@lists.infradead.org; Wed, 02 Mar 2016 02:49:38 +0000 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 60F69ADB6; Wed, 2 Mar 2016 02:49:15 +0000 (UTC) From: =?UTF-8?q?Andreas=20F=C3=A4rber?= To: linux-meson@googlegroups.com Subject: [PATCH v3] tty: serial: meson: Implement earlycon support Date: Wed, 2 Mar 2016 03:49:09 +0100 Message-Id: <1456886949-26503-1-git-send-email-afaerber@suse.de> X-Mailer: git-send-email 2.6.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160301_184938_406854_C75EC410 X-CRM114-Status: GOOD ( 11.83 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Hurley , Jonathan Corbet , Greg Kroah-Hartman , Nicolas Saenz Julienne , "open list:DOCUMENTATION" , open list , "open list:SERIAL DRIVERS" , Jiri Slaby , Carlo Caione , =?UTF-8?q?Andreas=20F=C3=A4rber?= , "moderated list:ARM/Amlogic Meson SoC support" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, 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 Split off the bulk of the existing meson_serial_console_write() implementation into meson_serial_port_write() for implementing meson_serial_early_console_write(). Use "meson" as the earlycon driver name, courtesy of Nicolas. Signed-off-by: Nicolas Saenz Julienne Signed-off-by: Andreas Färber Acked-by: Carlo Caione --- v2 -> v3: * Rename from "meson_serial" to just "meson" (Nicolas) v1 -> v2: * Implement meson_serial_early_console_write() instead of reusing meson_serial_console_write() (Peter) Documentation/kernel-parameters.txt | 6 ++++++ drivers/tty/serial/meson_uart.c | 42 ++++++++++++++++++++++++++++++------- 2 files changed, 41 insertions(+), 7 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index e0a21e4556a6..a7c1377fd80f 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1039,6 +1039,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. the driver will use only 32-bit accessors to read/write the device registers. + meson, + Start an early, polled-mode console on a meson serial + port at the specified address. The serial port must + already be setup and configured. Options are not yet + supported. + msm_serial, Start an early, polled-mode console on an msm serial port at the specified address. The serial port diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c index 024445aa0521..6aea0f4a9165 100644 --- a/drivers/tty/serial/meson_uart.c +++ b/drivers/tty/serial/meson_uart.c @@ -481,18 +481,13 @@ static void meson_console_putchar(struct uart_port *port, int ch) writel(ch, port->membase + AML_UART_WFIFO); } -static void meson_serial_console_write(struct console *co, const char *s, - u_int count) +static void meson_serial_port_write(struct uart_port *port, const char *s, + u_int count) { - struct uart_port *port; unsigned long flags; int locked; u32 val, tmp; - port = meson_ports[co->index]; - if (!port) - return; - local_irq_save(flags); if (port->sysrq) { locked = 0; @@ -516,6 +511,18 @@ static void meson_serial_console_write(struct console *co, const char *s, local_irq_restore(flags); } +static void meson_serial_console_write(struct console *co, const char *s, + u_int count) +{ + struct uart_port *port; + + port = meson_ports[co->index]; + if (!port) + return; + + meson_serial_port_write(port, s, count); +} + static int meson_serial_console_setup(struct console *co, char *options) { struct uart_port *port; @@ -554,6 +561,27 @@ static int __init meson_serial_console_init(void) } console_initcall(meson_serial_console_init); +static void meson_serial_early_console_write(struct console *co, + const char *s, + u_int count) +{ + struct earlycon_device *dev = co->data; + + meson_serial_port_write(&dev->port, s, count); +} + +static int __init +meson_serial_early_console_setup(struct earlycon_device *device, const char *opt) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = meson_serial_early_console_write; + return 0; +} +OF_EARLYCON_DECLARE(meson, "amlogic,meson-uart", + meson_serial_early_console_setup); + #define MESON_SERIAL_CONSOLE (&meson_serial_console) #else #define MESON_SERIAL_CONSOLE NULL