Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754714AbaDRWVj (ORCPT ); Fri, 18 Apr 2014 18:21:39 -0400 Received: from mail-oa0-f47.google.com ([209.85.219.47]:58386 "EHLO mail-oa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752982AbaDRWUU (ORCPT ); Fri, 18 Apr 2014 18:20:20 -0400 From: Rob Herring To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org Cc: Greg Kroah-Hartman , Jiri Slaby , Catalin Marinas , Russell King , Will Deacon , Arnd Bergmann , Rob Herring Subject: [PATCH v2 4/7] tty/serial: pl011: add generic earlycon support Date: Fri, 18 Apr 2014 17:19:57 -0500 Message-Id: <1397859600-11507-5-git-send-email-robherring2@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1397859600-11507-1-git-send-email-robherring2@gmail.com> References: <1397859600-11507-1-git-send-email-robherring2@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rob Herring Add earlycon support for the pl011 serial port. This allows enabling the pl011 for console when early_params are processed. This is based on the arm64 earlyprintk support and is intended to replace it. Signed-off-by: Rob Herring Cc: Russell King Cc: Greg Kroah-Hartman Cc: Jiri Slaby --- v2: - Rework the kernel-parameters.txt description Documentation/kernel-parameters.txt | 7 +++++++ drivers/tty/serial/Kconfig | 1 + drivers/tty/serial/amba-pl011.c | 30 +++++++++++++++++++++++++++++- 3 files changed, 37 insertions(+), 1 deletion(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 03e50b4..15b5fcca 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -890,6 +890,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. which are not unmapped. earlycon= [KNL] Output early console device and options. + uart[8250],io,[,options] uart[8250],mmio,[,options] uart[8250],mmio32,[,options] @@ -899,6 +900,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. (mmio) or 32-bit (mmio32). The options are the same as for ttyS, above. + pl011, + Start an early, polled-mode console on a pl011 serial + port at the specified address. The pl011 serial port + must already be setup and configured. Options are not + yet supported. + earlyprintk= [X86,SH,BLACKFIN,ARM] earlyprintk=vga earlyprintk=efi diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 3b7c19b..b1b23c2 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -60,6 +60,7 @@ config SERIAL_AMBA_PL011_CONSOLE bool "Support for console on AMBA serial port" depends on SERIAL_AMBA_PL011=y select SERIAL_CORE_CONSOLE + select SERIAL_EARLYCON ---help--- Say Y here if you wish to use an AMBA PrimeCell UART as the system console (the system console is the device which receives all kernel diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index d4eda24..4227c0a 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -303,7 +303,7 @@ static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port * /* Optionally make use of an RX channel as well */ chan = dma_request_slave_channel(dev, "rx"); - + if (!chan && plat->dma_rx_param) { chan = dma_request_channel(mask, plat->dma_filter, plat->dma_rx_param); @@ -2045,6 +2045,34 @@ static struct console amba_console = { }; #define AMBA_CONSOLE (&amba_console) + +static void pl011_putc(struct uart_port *port, int c) +{ + while (readl(port->membase + UART01x_FR) & UART01x_FR_TXFF) + ; + writeb(c, port->membase + UART01x_DR); + while (readl(port->membase + UART01x_FR) & UART01x_FR_BUSY) + ; +} + +static void pl011_early_write(struct console *con, const char *s, unsigned n) +{ + struct earlycon_device *dev = con->data; + + uart_console_write(&dev->port, s, n, pl011_putc); +} + +static int __init pl011_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = pl011_early_write; + return 0; +} +EARLYCON_DECLARE(pl011, pl011_early_console_setup); + #else #define AMBA_CONSOLE NULL #endif -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/