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authorRob Herring <robh@kernel.org>2014-03-27 08:06:16 -0500
committerRob Herring <robh@kernel.org>2014-05-20 15:19:25 -0500
commitb0b6abd34c1b508d4ac95dbc614f36c49d29e65a (patch)
tree153b298e55c0ba79dc0ff1ad7f3d308f8d9ed32f /drivers/tty/serial
parent54196ccbe0ba1f268a646059473313589db35b01 (diff)
serial: earlycon: add DT support
This adds the infrastructure to generic earlycon for earlycon setup using DT. The actual setup is not enabled until a following commit to add the FDT parsing. Signed-off-by: Rob Herring <robh@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'drivers/tty/serial')
-rw-r--r--drivers/tty/serial/earlycon.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index c92e83088adb..5131b5ee6164 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -15,6 +15,8 @@
#include <linux/init.h>
#include <linux/io.h>
#include <linux/serial_core.h>
+#include <linux/sizes.h>
+#include <linux/mod_devicetable.h>
#ifdef CONFIG_FIX_EARLYCON_MEM
#include <asm/fixmap.h>
@@ -32,6 +34,9 @@ static struct earlycon_device early_console_dev = {
.con = &early_con,
};
+static const struct of_device_id __earlycon_of_table_sentinel
+ __used __section(__earlycon_of_table_end);
+
static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
{
void __iomem *base;
@@ -142,3 +147,26 @@ int __init setup_earlycon(char *buf, const char *match,
register_console(early_console_dev.con);
return 0;
}
+
+int __init of_setup_earlycon(unsigned long addr,
+ int (*setup)(struct earlycon_device *, const char *))
+{
+ int err;
+ struct uart_port *port = &early_console_dev.port;
+
+ port->iotype = UPIO_MEM;
+ port->mapbase = addr;
+ port->uartclk = BASE_BAUD * 16;
+ port->membase = earlycon_map(addr, SZ_4K);
+
+ early_console_dev.con->data = &early_console_dev;
+ err = setup(&early_console_dev, NULL);
+ if (err < 0)
+ return err;
+ if (!early_console_dev.con->write)
+ return -ENODEV;
+
+
+ register_console(early_console_dev.con);
+ return 0;
+}