linux-kernel - [PATCH v2 -next 08/14] of: earlycon: Move address translation to of_setup

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Message-Id: <1425669930-22137-9-git-send-email-peter@hurleysoftware.com>
Date:	Fri,  6 Mar 2015 14:25:24 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Grant Likely <grant.likely@...aro.org>
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH v2 -next 08/14] of: earlycon: Move address translation to of_setup_earlycon()

Cleanup the early DT/earlycon separation; remove the 'addr' parameter
from of_setup_earlycon() and get the uart phys addr directly with a
new wrapper function, of_flat_dt_translate_addr(). Limit
fdt_translate_address() to file scope.

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/of/fdt.c              |  7 +------
 drivers/of/fdt_address.c      | 11 ++++++++++-
 drivers/tty/serial/earlycon.c | 11 +++++++----
 include/linux/of_fdt.h        |  2 +-
 include/linux/serial_core.h   |  3 +--
 5 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 4de1171..0850517 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -792,17 +792,12 @@ static int __init early_init_dt_scan_chosen_serial(void)
 		return -ENODEV;
 
 	while (match->compatible[0]) {
-		unsigned long addr;
 		if (fdt_node_check_compatible(fdt, offset, match->compatible)) {
 			match++;
 			continue;
 		}
 
-		addr = fdt_translate_address(fdt, offset);
-		if (!addr)
-			return -ENXIO;
-
-		of_setup_earlycon(addr, match, offset, options);
+		of_setup_earlycon(match, offset, options);
 		return 0;
 	}
 	return -ENODEV;
diff --git a/drivers/of/fdt_address.c b/drivers/of/fdt_address.c
index 8d3dc6f..dca8f9b 100644
--- a/drivers/of/fdt_address.c
+++ b/drivers/of/fdt_address.c
@@ -161,7 +161,7 @@ static int __init fdt_translate_one(const void *blob, int parent,
  * that can be mapped to a cpu physical address). This is not really specified
  * that way, but this is traditionally the way IBM at least do things
  */
-u64 __init fdt_translate_address(const void *blob, int node_offset)
+static u64 __init fdt_translate_address(const void *blob, int node_offset)
 {
 	int parent, len;
 	const struct of_bus *bus, *pbus;
@@ -239,3 +239,12 @@ u64 __init fdt_translate_address(const void *blob, int node_offset)
  bail:
 	return result;
 }
+
+/**
+ * of_flat_dt_translate_address - translate DT addr into CPU phys addr
+ * @node: node in the flat blob
+ */
+u64 __init of_flat_dt_translate_address(unsigned long node)
+{
+	return fdt_translate_address(initial_boot_params, node);
+}
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index 5b3d2b5..6449834 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -223,8 +223,7 @@ early_param("earlycon", param_setup_earlycon);
 
 #ifdef CONFIG_OF_EARLY_FLATTREE
 
-int __init of_setup_earlycon(unsigned long addr,
-			     const struct of_device_id *match,
+int __init of_setup_earlycon(const struct of_device_id *match,
 			     unsigned long node,
 			     const char *options)
 {
@@ -234,9 +233,13 @@ int __init of_setup_earlycon(unsigned long addr,
 	const __be32 *val;
 
 	port->iotype = UPIO_MEM;
-	port->mapbase = addr;
+	port->mapbase = of_flat_dt_translate_address(node);
+	if (!port->mapbase) {
+		pr_warn("[%s] bad address\n", match->name);
+		return -ENXIO;
+	}
 	port->uartclk = BASE_BAUD * 16;
-	port->membase = earlycon_map(addr, SZ_4K);
+	port->membase = earlycon_map(port->mapbase, SZ_4K);
 
 	val = of_get_flat_dt_prop(node, "reg-offset", NULL);
 	if (val)
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index 0ff360d..d31e6cb 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -85,7 +85,7 @@ extern void unflatten_device_tree(void);
 extern void unflatten_and_copy_device_tree(void);
 extern void early_init_devtree(void *);
 extern void early_get_first_memblock_info(void *, phys_addr_t *);
-extern u64 fdt_translate_address(const void *blob, int node_offset);
+extern u64 of_flat_dt_translate_address(unsigned long node);
 extern void of_fdt_limit_memory(int limit);
 #else /* CONFIG_OF_FLATTREE */
 static inline void early_init_fdt_scan_reserved_mem(void) {}
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index c8e4e8f..675d36f 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -345,8 +345,7 @@ struct earlycon_id {
 };
 
 extern int setup_earlycon(char *buf);
-extern int of_setup_earlycon(unsigned long addr,
-			     const struct of_device_id *match,
+extern int of_setup_earlycon(const struct of_device_id *match,
 			     unsigned long node,
 			     const char *options);
 
-- 
2.3.1

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