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path: root/drivers/tty/serial/8250/8250_early.c
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Diffstat (limited to 'drivers/tty/serial/8250/8250_early.c')
-rw-r--r--drivers/tty/serial/8250/8250_early.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index 85a12f032402..82fc48eca1df 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -39,6 +39,7 @@
static unsigned int __init serial8250_early_in(struct uart_port *port, int offset)
{
+ int reg_offset = offset;
offset <<= port->regshift;
switch (port->iotype) {
@@ -52,6 +53,8 @@ static unsigned int __init serial8250_early_in(struct uart_port *port, int offse
return ioread32be(port->membase + offset);
case UPIO_PORT:
return inb(port->iobase + offset);
+ case UPIO_AU:
+ return port->serial_in(port, reg_offset);
default:
return 0;
}
@@ -59,6 +62,7 @@ static unsigned int __init serial8250_early_in(struct uart_port *port, int offse
static void __init serial8250_early_out(struct uart_port *port, int offset, int value)
{
+ int reg_offset = offset;
offset <<= port->regshift;
switch (port->iotype) {
@@ -77,6 +81,9 @@ static void __init serial8250_early_out(struct uart_port *port, int offset, int
case UPIO_PORT:
outb(value, port->iobase + offset);
break;
+ case UPIO_AU:
+ port->serial_out(port, reg_offset, value);
+ break;
}
}
@@ -172,3 +179,20 @@ OF_EARLYCON_DECLARE(omap8250, "ti,omap3-uart", early_omap8250_setup);
OF_EARLYCON_DECLARE(omap8250, "ti,omap4-uart", early_omap8250_setup);
#endif
+
+#ifdef CONFIG_SERIAL_8250_RT288X
+
+unsigned int au_serial_in(struct uart_port *p, int offset);
+void au_serial_out(struct uart_port *p, int offset, int value);
+
+static int __init early_au_setup(struct earlycon_device *dev, const char *opt)
+{
+ dev->port.serial_in = au_serial_in;
+ dev->port.serial_out = au_serial_out;
+ dev->port.iotype = UPIO_AU;
+ dev->con->write = early_serial8250_write;
+ return 0;
+}
+OF_EARLYCON_DECLARE(palmchip, "ralink,rt2880-uart", early_au_setup);
+
+#endif
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