Messages in this thread | | | Subject | Re: [PATCH 1/2] serial: support register interface with 16-bit stride for console | From | Peter Hurley <> | Date | Mon, 19 Oct 2015 15:50:04 -0400 |
| |
On 10/19/2015 01:40 AM, Masahiro Yamada wrote: > Currently, 8-bit (MMIO) and 32-bit (MMIO32) strides are supported for > the 8250 console, but 16-bit (MMIO16) stride is not. The 8250 UART > device on my board has 16-bit stride (reg-shift = <1>) and I am eager > to use earlycon with it. > > Refer to arch/arm/boot/dts/uniphier-support-card.dtsi: > > serialsc: uart@000b0000 { > compatible = "ns16550a"; > reg = <0x000b0000 0x20>; > clock-frequency = <12288000>; > reg-shift = <1>; > }; > > Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> > --- > > Documentation/kernel-parameters.txt | 9 +++++---- > drivers/tty/serial/8250/8250_early.c | 5 +++++ > drivers/tty/serial/8250/8250_port.c | 20 ++++++++++++++++++++ > drivers/tty/serial/earlycon.c | 15 +++++++++++---- > drivers/tty/serial/serial_core.c | 9 +++++++-- > include/linux/serial_core.h | 1 + > include/uapi/linux/serial.h | 9 +++++---- > 7 files changed, 54 insertions(+), 14 deletions(-) >
[...]
> diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h > index 25331f9..1d20d9c 100644 > --- a/include/uapi/linux/serial.h > +++ b/include/uapi/linux/serial.h > @@ -65,10 +65,11 @@ struct serial_struct { > #define SERIAL_IO_PORT 0 > #define SERIAL_IO_HUB6 1 > #define SERIAL_IO_MEM 2 > -#define SERIAL_IO_MEM32 3 > -#define SERIAL_IO_AU 4 > -#define SERIAL_IO_TSI 5 > -#define SERIAL_IO_MEM32BE 6 > +#define SERIAL_IO_MEM16 3 > +#define SERIAL_IO_MEM32 4 > +#define SERIAL_IO_AU 5 > +#define SERIAL_IO_TSI 6 > +#define SERIAL_IO_MEM32BE 7
The existing values cannot be re-defined since they're userspace visible.
Regards, Peter Hurley
> #define UART_CLEAR_FIFO 0x01 > #define UART_USE_FIFO 0x02 >
| |