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of: earlycon: Initialize port fields from DT properties

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Read the optional "reg-offset", "reg-shift", "reg-io-width" and endianness
properties and initialize the respective struct uart_port field if found.

NB: These bindings are common to several drivers and the values merely
indicate the default value; the registering earlycon setup() method can
simply override the values if required.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2016-01-16 15:23:43 -08:00 committed by Greg Kroah-Hartman
parent 4d118c9a86
commit 088da2a176
3 changed files with 33 additions and 1 deletions
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2
drivers/of/fdt.c
View File

@ -839,7 +839,7 @@ static int __init early_init_dt_scan_chosen_serial(void)
if (addr == OF_BAD_ADDR)
return -ENXIO;
of_setup_earlycon(addr, match, options);
of_setup_earlycon(addr, match, offset, options);
return 0;
}
return -ENODEV;

31
drivers/tty/serial/earlycon.c
View File

@ -19,6 +19,7 @@
#include <linux/io.h>
#include <linux/serial_core.h>
#include <linux/sizes.h>
#include <linux/of_fdt.h>
#ifdef CONFIG_FIX_EARLYCON_MEM
#include <asm/fixmap.h>
@ -219,10 +220,13 @@ early_param("earlycon", param_setup_earlycon);
int __init of_setup_earlycon(unsigned long addr,
const struct earlycon_id *match,
unsigned long node,
const char *options)
{
int err;
struct uart_port *port = &early_console_dev.port;
const __be32 *val;
bool big_endian;
spin_lock_init(&port->lock);
port->iotype = UPIO_MEM;
@ -230,6 +234,33 @@ int __init of_setup_earlycon(unsigned long addr,
port->uartclk = BASE_BAUD * 16;
port->membase = earlycon_map(addr, SZ_4K);
val = of_get_flat_dt_prop(node, "reg-offset", NULL);
if (val)
port->mapbase += be32_to_cpu(*val);
val = of_get_flat_dt_prop(node, "reg-shift", NULL);
if (val)
port->regshift = be32_to_cpu(*val);
big_endian = of_get_flat_dt_prop(node, "big-endian", NULL) != NULL ||
(IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) &&
of_get_flat_dt_prop(node, "native-endian", NULL) != NULL);
val = of_get_flat_dt_prop(node, "reg-io-width", NULL);
if (val) {
switch (be32_to_cpu(*val)) {
case 1:
port->iotype = UPIO_MEM;
break;
case 2:
port->iotype = UPIO_MEM16;
break;
case 4:
port->iotype = (big_endian) ? UPIO_MEM32BE : UPIO_MEM32;
break;
default:
pr_warn("[%s] unsupported reg-io-width\n", match->name);
return -EINVAL;
}
}
if (options) {
strlcpy(early_console_dev.options, options,
sizeof(early_console_dev.options));

1
include/linux/serial_core.h
View File

@ -360,6 +360,7 @@ extern const struct earlycon_id __earlycon_table_end[];
extern int setup_earlycon(char *buf);
extern int of_setup_earlycon(unsigned long addr, const struct earlycon_id *match,
unsigned long node,
const char *options);
struct uart_port *uart_get_console(struct uart_port *ports, int nr,