linux-kernel - [PATCH 1/3] nvmem: qfprom: Allow single byte accesses for read/write

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Message-Id: <1483546691-24099-2-git-send-email-srinivas.kandagatla@linaro.org>
Date:   Wed,  4 Jan 2017 16:18:09 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        linux-kernel@...r.kernel.org, srinivas.kandagatla@...aro.org,
        Vivek Gautam <vivek.gautam@...eaurora.org>
Subject: [PATCH 1/3] nvmem: qfprom: Allow single byte accesses for read/write

From: Vivek Gautam <vivek.gautam@...eaurora.org>

The nvmem core driver supports to read and write single
byte. So, allow qfprom to support this feature.
This change helps in extracting a required value based
on bit-offset and number of bits for the required value
in the nvmem cell.

Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/nvmem/qfprom.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c
index b5305f0..2bdb6c3 100644
--- a/drivers/nvmem/qfprom.c
+++ b/drivers/nvmem/qfprom.c
@@ -21,11 +21,11 @@ static int qfprom_reg_read(void *context,
 			unsigned int reg, void *_val, size_t bytes)
 {
 	void __iomem *base = context;
-	u32 *val = _val;
-	int i = 0, words = bytes / 4;
+	u8 *val = _val;
+	int i = 0, words = bytes;
 
 	while (words--)
-		*val++ = readl(base + reg + (i++ * 4));
+		*val++ = readb(base + reg + i++);
 
 	return 0;
 }
@@ -34,11 +34,11 @@ static int qfprom_reg_write(void *context,
 			 unsigned int reg, void *_val, size_t bytes)
 {
 	void __iomem *base = context;
-	u32 *val = _val;
-	int i = 0, words = bytes / 4;
+	u8 *val = _val;
+	int i = 0, words = bytes;
 
 	while (words--)
-		writel(*val++, base + reg + (i++ * 4));
+		writeb(*val++, base + reg + i++);
 
 	return 0;
 }
@@ -53,7 +53,7 @@ static int qfprom_remove(struct platform_device *pdev)
 static struct nvmem_config econfig = {
 	.name = "qfprom",
 	.owner = THIS_MODULE,
-	.stride = 4,
+	.stride = 1,
 	.word_size = 1,
 	.reg_read = qfprom_reg_read,
 	.reg_write = qfprom_reg_write,
-- 
2.7.4