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 <stefan@agner.ch> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1023,6 +1023,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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serial port must already be setup and configured.
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Options are not yet supported.
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lpuart,<addr>
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lpuart32,<addr>
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Use early console provided by Freescale LP UART driver
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found on Freescale Vybrid and QorIQ LS1021A processors.
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A valid base address must be provided, and the serial
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port must already be setup and configured.
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earlyprintk= [X86,SH,BLACKFIN,ARM,M68k]
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earlyprintk=vga
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earlyprintk=efi
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@ -1539,6 +1539,7 @@ config SERIAL_FSL_LPUART
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tristate "Freescale lpuart serial port support"
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depends on HAS_DMA
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select SERIAL_CORE
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select SERIAL_EARLYCON
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help
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Support for the on-chip lpuart on some Freescale SOCs.
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@ -1746,6 +1746,45 @@ static struct console lpuart32_console = {
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.data = &lpuart_reg,
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};
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static void lpuart_early_write(struct console *con, const char *s, unsigned n)
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{
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struct earlycon_device *dev = con->data;
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uart_console_write(&dev->port, s, n, lpuart_console_putchar);
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}
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static void lpuart32_early_write(struct console *con, const char *s, unsigned n)
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{
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struct earlycon_device *dev = con->data;
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uart_console_write(&dev->port, s, n, lpuart32_console_putchar);
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}
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static int __init lpuart_early_console_setup(struct earlycon_device *device,
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const char *opt)
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{
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if (!device->port.membase)
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return -ENODEV;
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device->con->write = lpuart_early_write;
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return 0;
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}
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static int __init lpuart32_early_console_setup(struct earlycon_device *device,
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const char *opt)
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{
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if (!device->port.membase)
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return -ENODEV;
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device->con->write = lpuart32_early_write;
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return 0;
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}
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OF_EARLYCON_DECLARE(lpuart, "fsl,vf610-lpuart", lpuart_early_console_setup);
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OF_EARLYCON_DECLARE(lpuart32, "fsl,ls1021a-lpuart", lpuart32_early_console_setup);
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EARLYCON_DECLARE(lpuart, lpuart_early_console_setup);
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EARLYCON_DECLARE(lpuart32, lpuart32_early_console_setup);
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#define LPUART_CONSOLE (&lpuart_console)
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#define LPUART32_CONSOLE (&lpuart32_console)
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#else
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