From 1d59b382f1c4111933ab56166eb520ac98676b22 Mon Sep 17 00:00:00 2001 From: Stefan Agner Date: Sat, 17 Oct 2015 00:45:55 -0700 Subject: serial: fsl_lpuart: add earlycon support Add support for DT and command line based earlycon support for lpuart and lpuart32 used on Freescale Vybrid and and QorIQ LS1021A processors. Signed-off-by: Stefan Agner Signed-off-by: Greg Kroah-Hartman diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 22a4b68..8d9dd53 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1023,6 +1023,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. serial port must already be setup and configured. Options are not yet supported. + lpuart, + lpuart32, + Use early console provided by Freescale LP UART driver + found on Freescale Vybrid and QorIQ LS1021A processors. + A valid base address must be provided, and the serial + port must already be setup and configured. + earlyprintk= [X86,SH,BLACKFIN,ARM,M68k] earlyprintk=vga earlyprintk=efi diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 0667d1a..1aec440 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1539,6 +1539,7 @@ config SERIAL_FSL_LPUART tristate "Freescale lpuart serial port support" depends on HAS_DMA select SERIAL_CORE + select SERIAL_EARLYCON help Support for the on-chip lpuart on some Freescale SOCs. diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 08ce76f..3d79003 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1746,6 +1746,45 @@ static struct console lpuart32_console = { .data = &lpuart_reg, }; +static void lpuart_early_write(struct console *con, const char *s, unsigned n) +{ + struct earlycon_device *dev = con->data; + + uart_console_write(&dev->port, s, n, lpuart_console_putchar); +} + +static void lpuart32_early_write(struct console *con, const char *s, unsigned n) +{ + struct earlycon_device *dev = con->data; + + uart_console_write(&dev->port, s, n, lpuart32_console_putchar); +} + +static int __init lpuart_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = lpuart_early_write; + return 0; +} + +static int __init lpuart32_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = lpuart32_early_write; + return 0; +} + +OF_EARLYCON_DECLARE(lpuart, "fsl,vf610-lpuart", lpuart_early_console_setup); +OF_EARLYCON_DECLARE(lpuart32, "fsl,ls1021a-lpuart", lpuart32_early_console_setup); +EARLYCON_DECLARE(lpuart, lpuart_early_console_setup); +EARLYCON_DECLARE(lpuart32, lpuart32_early_console_setup); + #define LPUART_CONSOLE (&lpuart_console) #define LPUART32_CONSOLE (&lpuart32_console) #else -- cgit v0.10.2