linux-kernel - [PATCHv2 2/5] mmc: sdhci-bcm2835: make shift calculations consistent

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Date:	Wed, 29 Oct 2014 23:36:54 -0700
From:	Scott Branden <sbranden@...adcom.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Peter Griffin <peter.griffin@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Chris Ball <chris@...ntf.net>,
	Piotr Krol <pietrushnic@...il.com>
CC:	<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Joe Perches <joe@...ches.com>,
	<linux-rpi-kernel@...ts.infradead.org>,
	Ray Jui <rjui@...adcom.com>,
	<bcm-kernel-feedback-list@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>
Subject: [PATCHv2 2/5] mmc: sdhci-bcm2835: make shift calculations consistent

Make the shift calculations consistent rather than having different
implementations to calculate the same thing.

Signed-off-by: Scott Branden <sbranden@...adcom.com>
---
 drivers/mmc/host/sdhci-bcm2835.c |   18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/mmc/host/sdhci-bcm2835.c b/drivers/mmc/host/sdhci-bcm2835.c
index c8ee02c..b6cb365 100644
--- a/drivers/mmc/host/sdhci-bcm2835.c
+++ b/drivers/mmc/host/sdhci-bcm2835.c
@@ -54,6 +54,8 @@ struct bcm2835_sdhci {
 	u32 shadow;
 };
 
+#define REG_OFFSET_IN_BITS(reg) ((reg) << 3 & 0x18)
+
 static inline u32 bcm2835_sdhci_readl(struct sdhci_host *host, int reg)
 {
 	u32 val = readl(host->ioaddr + reg);
@@ -67,20 +69,14 @@ static inline u32 bcm2835_sdhci_readl(struct sdhci_host *host, int reg)
 static u16 bcm2835_sdhci_readw(struct sdhci_host *host, int reg)
 {
 	u32 val = bcm2835_sdhci_readl(host, (reg & ~3));
-	u32 word_num = (reg >> 1) & 1;
-	u32 word_shift = word_num * 16;
-	u32 word = (val >> word_shift) & 0xffff;
-
+	u16 word = val >> REG_OFFSET_IN_BITS(reg) & 0xffff;
 	return word;
 }
 
 static u8 bcm2835_sdhci_readb(struct sdhci_host *host, int reg)
 {
 	u32 val = bcm2835_sdhci_readl(host, (reg & ~3));
-	u32 byte_num = reg & 3;
-	u32 byte_shift = byte_num * 8;
-	u32 byte = (val >> byte_shift) & 0xff;
-
+	u8 byte = val >> REG_OFFSET_IN_BITS(reg) & 0xff;
 	return byte;
 }
 
@@ -98,8 +94,7 @@ static void bcm2835_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
 	struct bcm2835_sdhci *bcm2835_host = pltfm_host->priv;
 	u32 oldval = (reg == SDHCI_COMMAND) ? bcm2835_host->shadow :
 		bcm2835_sdhci_readl(host, reg & ~3);
-	u32 word_num = (reg >> 1) & 1;
-	u32 word_shift = word_num * 16;
+	u32 word_shift = REG_OFFSET_IN_BITS(reg);
 	u32 mask = 0xffff << word_shift;
 	u32 newval = (oldval & ~mask) | (val << word_shift);
 
@@ -112,8 +107,7 @@ static void bcm2835_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
 static void bcm2835_sdhci_writeb(struct sdhci_host *host, u8 val, int reg)
 {
 	u32 oldval = bcm2835_sdhci_readl(host, reg & ~3);
-	u32 byte_num = reg & 3;
-	u32 byte_shift = byte_num * 8;
+	u32 byte_shift = REG_OFFSET_IN_BITS(reg);
 	u32 mask = 0xff << byte_shift;
 	u32 newval = (oldval & ~mask) | (val << byte_shift);
 
-- 
1.7.9.5

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