diff options
| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2015-10-28 12:46:05 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-12-13 19:59:48 -0800 |
| commit | bd94c4077a0b2ecc35562c294f80f3659ecd8499 (patch) | |
| tree | 939d81f6945ce1b0925ab4bf6f7e40c399057e17 /drivers/tty/serial/serial_core.c | |
| parent | 004e2ed5cc6d89201140ca96693bf9c0b2945f43 (diff) | |
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 <yamada.masahiro@socionext.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/serial_core.c')
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 22cfc3271744..b1f54ab1818c 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1818,8 +1818,8 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co) * @options: ptr for <options> field; NULL if not present (out) * * Decodes earlycon kernel command line parameters of the form - * earlycon=<name>,io|mmio|mmio32|mmio32be|mmio32native,<addr>,<options> - * console=<name>,io|mmio|mmio32|mmio32be|mmio32native,<addr>,<options> + * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> + * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> * * The optional form * earlycon=<name>,0x<addr>,<options> @@ -1834,6 +1834,9 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr, if (strncmp(p, "mmio,", 5) == 0) { *iotype = UPIO_MEM; p += 5; + } else if (strncmp(p, "mmio16,", 7) == 0) { + *iotype = UPIO_MEM16; + p += 7; } else if (strncmp(p, "mmio32,", 7) == 0) { *iotype = UPIO_MEM32; p += 7; @@ -2186,6 +2189,7 @@ uart_report_port(struct uart_driver *drv, struct uart_port *port) "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); break; case UPIO_MEM: + case UPIO_MEM16: case UPIO_MEM32: case UPIO_MEM32BE: case UPIO_AU: @@ -2831,6 +2835,7 @@ int uart_match_port(struct uart_port *port1, struct uart_port *port2) return (port1->iobase == port2->iobase) && (port1->hub6 == port2->hub6); case UPIO_MEM: + case UPIO_MEM16: case UPIO_MEM32: case UPIO_MEM32BE: case UPIO_AU: |