From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755442AbcCBCtV (ORCPT ); Tue, 1 Mar 2016 21:49:21 -0500 Received: from mx2.suse.de ([195.135.220.15]:39595 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752148AbcCBCtS (ORCPT ); Tue, 1 Mar 2016 21:49:18 -0500 From: =?UTF-8?q?Andreas=20F=C3=A4rber?= To: linux-meson@googlegroups.com Cc: Peter Hurley , =?UTF-8?q?Andreas=20F=C3=A4rber?= , Nicolas Saenz Julienne , Jonathan Corbet , Greg Kroah-Hartman , Jiri Slaby , Carlo Caione , linux-doc@vger.kernel.org (open list:DOCUMENTATION), linux-kernel@vger.kernel.org (open list), linux-serial@vger.kernel.org (open list:SERIAL DRIVERS), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Amlogic Meson SoC support) 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 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 -- 2.6.2