lkml.org 
[lkml]   [2017]   [Apr]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2] serial: 8250_early: Add earlycon support for Palmchip UART
Date
Define an OF early console for Palmchip UART, which can be enabled
by passing "earlycon" on the boot command line.

Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
---
drivers/tty/serial/8250/8250_early.c | 24 ++++++++++++++++++++++++
drivers/tty/serial/8250/8250_port.c | 4 ++--
2 files changed, 26 insertions(+), 2 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
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 080d5a59d0a7..1f08d22d1a80 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -313,7 +313,7 @@ static const s8 au_io_out_map[8] = {
-1, /* UART_SCR (unmapped) */
};

-static unsigned int au_serial_in(struct uart_port *p, int offset)
+unsigned int au_serial_in(struct uart_port *p, int offset)
{
if (offset >= ARRAY_SIZE(au_io_in_map))
return UINT_MAX;
@@ -323,7 +323,7 @@ static unsigned int au_serial_in(struct uart_port *p, int offset)
return __raw_readl(p->membase + (offset << p->regshift));
}

-static void au_serial_out(struct uart_port *p, int offset, int value)
+void au_serial_out(struct uart_port *p, int offset, int value)
{
if (offset >= ARRAY_SIZE(au_io_out_map))
return;
--
2.11.0
\
 
 \ /
  Last update: 2017-04-10 11:47    [W:0.046 / U:0.168 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site