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authorMichal Simek <michal.simek@xilinx.com>2014-09-10 12:43:02 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-28 21:32:37 -0400
commit6fa62fc46e10f34aed70d2cfcf573ba8d3833e18 (patch)
treed1ba4c97c243a577b80e920a6873681eac817992 /drivers/tty
parenta4688bcd34bd2f4fe7fb88856c85d3091270ab53 (diff)
serial: cadence: Add generic earlycon support
Add earlycon support for the cadence serial port. This is based on recent patches: "tty/serial: pl011: add generic earlycon support" (sha1: 0d3c673e7881e691991b2a4745bd4f149603baa2) "tty/serial: add arm/arm64 semihosting earlycon" (sha1: d50d7269ebcb438afa346cdffce0f4e2a1b9e831) Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/Kconfig1
-rw-r--r--drivers/tty/serial/xilinx_uartps.c19
2 files changed, 20 insertions, 0 deletions
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 81f6ee7d4223..02a896f4dbcd 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1429,6 +1429,7 @@ config SERIAL_XILINX_PS_UART_CONSOLE
bool "Cadence UART console support"
depends on SERIAL_XILINX_PS_UART=y
select SERIAL_CORE_CONSOLE
+ select SERIAL_EARLYCON
help
Enable a Cadence UART port to be the system console.
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 7f8027f27ab9..200c1af2141b 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1051,6 +1051,25 @@ static void cdns_uart_console_putchar(struct uart_port *port, int ch)
cdns_uart_writel(ch, CDNS_UART_FIFO_OFFSET);
}
+static void cdns_early_write(struct console *con, const char *s, unsigned n)
+{
+ struct earlycon_device *dev = con->data;
+
+ uart_console_write(&dev->port, s, n, cdns_uart_console_putchar);
+}
+
+static int __init cdns_early_console_setup(struct earlycon_device *device,
+ const char *opt)
+{
+ if (!device->port.membase)
+ return -ENODEV;
+
+ device->con->write = cdns_early_write;
+
+ return 0;
+}
+EARLYCON_DECLARE(cdns, cdns_early_console_setup);
+
/**
* cdns_uart_console_write - perform write operation
* @co: Console handle