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Subject[PATCH -next 05/12] of: earlycon: Initialize port fields from DT properties
Date
Read the optional "reg-offset", "reg-shift" and "reg-io-width" 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.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
drivers/of/fdt.c | 2 +-
drivers/tty/serial/earlycon.c | 27 +++++++++++++++++++++++++++
include/linux/serial_core.h | 1 +
3 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index bdb74a8..a732890 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -802,7 +802,7 @@ int __init early_init_dt_scan_chosen_serial(void)
if (!addr)
return -ENXIO;

- of_setup_earlycon(addr, match, options);
+ of_setup_earlycon(addr, match, offset, options);
return 0;
}
return -ENODEV;
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index 436ac88..019010f 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -21,6 +21,10 @@
#include <linux/sizes.h>
#include <linux/mod_devicetable.h>

+#ifdef CONFIG_OF_EARLY_FLATTREE
+#include <linux/of_fdt.h>
+#endif
+
#ifdef CONFIG_FIX_EARLYCON_MEM
#include <asm/fixmap.h>
#endif
@@ -219,17 +223,40 @@ early_param("earlycon", param_setup_earlycon);

int __init of_setup_earlycon(unsigned long addr,
const struct of_device_id *match,
+ unsigned long node,
const char *options)
{
int err;
struct uart_port *port = &early_console_dev.port;
int (*setup)(struct earlycon_device *, const char *) = match->data;
+ const __be32 *val;

port->iotype = UPIO_MEM;
port->mapbase = 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);
+ 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 4:
+ port->iotype = 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));
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index ebbcd43..c8e4e8f 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -347,6 +347,7 @@ struct earlycon_id {
extern int setup_earlycon(char *buf);
extern int of_setup_earlycon(unsigned long addr,
const struct of_device_id *match,
+ unsigned long node,
const char *options);

#define EARLYCON_DECLARE(_name, func) \
--
2.3.1


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