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serial: 8250_early: Add earlycon support for Palmchip UART

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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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marc Gonzalez 2017-04-10 11:47:09 +02:00 committed by Greg Kroah-Hartman
parent 5a0722b898
commit 72f1b85a04
2 changed files with 26 additions and 2 deletions
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24
drivers/tty/serial/8250/8250_early.c
View file

@ -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

4
drivers/tty/serial/8250/8250_port.c
View file

@ -328,7 +328,7 @@ 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;
@ -338,7 +338,7 @@ 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;