linux-kernel - [PATCH 5/5] can: sja1000: of: add read/write routines for 8, 16 and 32-bit register access

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Date:	Thu, 30 Jan 2014 15:29:28 +0100
From:	Florian Vaussard <florian.vaussard@...l.ch>
To:	Wolfgang Grandegger <wg@...ndegger.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Cc:	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, florian.vaussard@...l.ch,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org
Subject: [PATCH 5/5] can: sja1000: of: add read/write routines for 8, 16 and 32-bit register access

Add routines for 8, 16 and 32-bit access like in sja1000_platform.c

Cc: Grant Likely <grant.likely@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Pawel Moll <pawel.moll@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
Cc: Kumar Gala <galak@...eaurora.org>
Cc: devicetree@...r.kernel.org
Signed-off-by: Florian Vaussard <florian.vaussard@...l.ch>
---
 drivers/net/can/sja1000/sja1000_of_platform.c | 41 +++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/sja1000/sja1000_of_platform.c b/drivers/net/can/sja1000/sja1000_of_platform.c
index 8ebb4af..a9a0696 100644
--- a/drivers/net/can/sja1000/sja1000_of_platform.c
+++ b/drivers/net/can/sja1000/sja1000_of_platform.c
@@ -55,17 +55,39 @@ MODULE_LICENSE("GPL v2");
 
 #define SJA1000_OFP_CAN_CLOCK  (16000000 / 2)
 
-static u8 sja1000_ofp_read_reg(const struct sja1000_priv *priv, int reg)
+static u8 sja1000_ofp_read_reg8(const struct sja1000_priv *priv, int reg)
 {
 	return ioread8(priv->reg_base + reg);
 }
 
-static void sja1000_ofp_write_reg(const struct sja1000_priv *priv,
-				  int reg, u8 val)
+static void sja1000_ofp_write_reg8(const struct sja1000_priv *priv,
+				   int reg, u8 val)
 {
 	iowrite8(val, priv->reg_base + reg);
 }
 
+static u8 sja1000_ofp_read_reg16(const struct sja1000_priv *priv, int reg)
+{
+	return ioread8(priv->reg_base + reg * 2);
+}
+
+static void sja1000_ofp_write_reg16(const struct sja1000_priv *priv,
+				    int reg, u8 val)
+{
+	iowrite8(val, priv->reg_base + reg * 2);
+}
+
+static u8 sja1000_ofp_read_reg32(const struct sja1000_priv *priv, int reg)
+{
+	return ioread8(priv->reg_base + reg * 4);
+}
+
+static void sja1000_ofp_write_reg32(const struct sja1000_priv *priv,
+				    int reg, u8 val)
+{
+	iowrite8(val, priv->reg_base + reg * 4);
+}
+
 static int sja1000_ofp_remove(struct platform_device *ofdev)
 {
 	struct net_device *dev = platform_get_drvdata(ofdev);
@@ -121,8 +143,17 @@ static int sja1000_ofp_probe(struct platform_device *ofdev)
 
 	priv = netdev_priv(dev);
 
-	priv->read_reg = sja1000_ofp_read_reg;
-	priv->write_reg = sja1000_ofp_write_reg;
+	of_property_read_u32(np, "reg-io-width", &prop);
+	if (prop == 4) {
+		priv->read_reg = sja1000_ofp_read_reg32;
+		priv->write_reg = sja1000_ofp_write_reg32;
+	} else if (prop == 2) {
+		priv->read_reg = sja1000_ofp_read_reg16;
+		priv->write_reg = sja1000_ofp_write_reg16;
+	} else {
+		priv->read_reg = sja1000_ofp_read_reg8;
+		priv->write_reg = sja1000_ofp_write_reg8;
+	}
 
 	err = of_property_read_u32(np, "nxp,external-clock-frequency", &prop);
 	if (!err)
-- 
1.8.1.2

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