From b8b4bb0745b63e03eec745ce0eb97bfa6e0792a1 Mon Sep 17 00:00:00 2001
From: Dean Glazeski <dnglaze@gmail.com>
Date: Thu, 17 Dec 2009 21:02:39 -0600
Subject: NAND read data page refactor.

Added a new function to encapsulate reading a page of data from
a NAND device using either the read_block_data function of a NAND
controller or to use direct reading of data from the NAND device.

This also adds some performance enhancements and uses the read_data
function if the read_block_data function fails safely (because it
can't allocate a buffer in the working area).

[dbrownell@users.sourceforge.net: fix fault handling, whitespace]

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
---
 src/flash/nand/core.c | 68 +++++++++++++++++----------------------------------
 src/flash/nand/core.h |  2 ++
 2 files changed, 25 insertions(+), 45 deletions(-)

(limited to 'src/flash')

diff --git a/src/flash/nand/core.c b/src/flash/nand/core.c
index d52cf5df..1056696d 100644
--- a/src/flash/nand/core.c
+++ b/src/flash/nand/core.c
@@ -768,11 +768,31 @@ int nand_page_command(struct nand_device *nand, uint32_t page,
 	return ERROR_OK;
 }
 
+int nand_read_data_page(struct nand_device *nand, uint8_t *data, uint32_t size)
+{
+	int retval = ERROR_NAND_NO_BUFFER;
+
+	if (nand->controller->read_block_data != NULL)
+		retval = (nand->controller->read_block_data)(nand, data, size);
+
+	if (ERROR_NAND_NO_BUFFER == retval) {
+		uint32_t i;
+		int incr = (nand->device->options & NAND_BUSWIDTH_16) ? 2 : 1;
+
+		retval = ERROR_OK;
+		for (i = 0; retval == ERROR_OK && i < size; i += incr) {
+			retval = nand->controller->read_data(nand, data);
+			data += incr;
+		}
+	}
+
+	return retval;
+}
+
 int nand_read_page_raw(struct nand_device *nand, uint32_t page,
 		uint8_t *data, uint32_t data_size,
 		uint8_t *oob, uint32_t oob_size)
 {
-	uint32_t i;
 	int retval;
 
 	retval = nand_page_command(nand, page, NAND_CMD_READ0, !data);
@@ -780,52 +800,10 @@ int nand_read_page_raw(struct nand_device *nand, uint32_t page,
 		return retval;
 
 	if (data)
-	{
-		if (nand->controller->read_block_data != NULL)
-			(nand->controller->read_block_data)(nand, data, data_size);
-		else
-		{
-			for (i = 0; i < data_size;)
-			{
-				if (nand->device->options & NAND_BUSWIDTH_16)
-				{
-					nand->controller->read_data(nand, data);
-					data += 2;
-					i += 2;
-				}
-				else
-				{
-					nand->controller->read_data(nand, data);
-					data += 1;
-					i += 1;
-				}
-			}
-		}
-	}
+		nand_read_data_page(nand, data, data_size);
 
 	if (oob)
-	{
-		if (nand->controller->read_block_data != NULL)
-			(nand->controller->read_block_data)(nand, oob, oob_size);
-		else
-		{
-			for (i = 0; i < oob_size;)
-			{
-				if (nand->device->options & NAND_BUSWIDTH_16)
-				{
-					nand->controller->read_data(nand, oob);
-					oob += 2;
-					i += 2;
-				}
-				else
-				{
-					nand->controller->read_data(nand, oob);
-					oob += 1;
-					i += 1;
-				}
-			}
-		}
-	}
+		nand_read_data_page(nand, oob, oob_size);
 
 	return ERROR_OK;
 }
diff --git a/src/flash/nand/core.h b/src/flash/nand/core.h
index b8dc01c7..990114ad 100644
--- a/src/flash/nand/core.h
+++ b/src/flash/nand/core.h
@@ -211,6 +211,8 @@ struct nand_device *get_nand_device_by_num(int num);
 int nand_page_command(struct nand_device *nand, uint32_t page,
 		uint8_t cmd, bool oob_only);
 
+int nand_read_data_page(struct nand_device *nand, uint8_t *data, uint32_t size);
+
 int nand_read_page_raw(struct nand_device *nand, uint32_t page,
 		uint8_t *data, uint32_t data_size, uint8_t *oob, uint32_t oob_size);
 int nand_write_page_raw(struct nand_device *nand, uint32_t page,
-- 
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