From bd94c4077a0b2ecc35562c294f80f3659ecd8499 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Wed, 28 Oct 2015 12:46:05 +0900 Subject: serial: support 16-bit register interface for console Currently, 8-bit (MMIO) and 32-bit (MMIO32) register interfaces are supported for the 8250 console, but the 16-bit (MMIO16) is not. The 8250 UART device on my board is connected to a 16-bit bus and my main motivation is to use earlycon with it. (Refer to arch/arm/boot/dts/uniphier-support-card.dtsi) Signed-off-by: Masahiro Yamada Reviewed-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/earlycon.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) (limited to 'drivers/tty/serial/earlycon.c') diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index f09636083426..07f7393210db 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -71,10 +71,16 @@ static int __init parse_options(struct earlycon_device *device, char *options) return -EINVAL; switch (port->iotype) { + case UPIO_MEM: + port->mapbase = addr; + break; + case UPIO_MEM16: + port->regshift = 1; + port->mapbase = addr; + break; case UPIO_MEM32: case UPIO_MEM32BE: - port->regshift = 2; /* fall-through */ - case UPIO_MEM: + port->regshift = 2; port->mapbase = addr; break; case UPIO_PORT: @@ -91,10 +97,11 @@ static int __init parse_options(struct earlycon_device *device, char *options) strlcpy(device->options, options, length); } - if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM32 || - port->iotype == UPIO_MEM32BE) + if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM16 || + port->iotype == UPIO_MEM32 || port->iotype == UPIO_MEM32BE) pr_info("Early serial console at MMIO%s 0x%llx (options '%s')\n", (port->iotype == UPIO_MEM) ? "" : + (port->iotype == UPIO_MEM16) ? "16" : (port->iotype == UPIO_MEM32) ? "32" : "32be", (unsigned long long)port->mapbase, device->options); -- cgit v1.2.3