linux-kernel - [PATCH v2 11/13] comedi: amplc_dio200_common: Refactor register access functions

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Message-Id: <20230913164013.107520-12-abbotti@mev.co.uk>
Date:   Wed, 13 Sep 2023 17:40:11 +0100
From:   Ian Abbott <abbotti@....co.uk>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ian Abbott <abbotti@....co.uk>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Arnd Bergmann <arnd@...nel.org>,
        Niklas Schnelle <schnelle@...ux.ibm.com>
Subject: [PATCH v2 11/13] comedi: amplc_dio200_common: Refactor register access functions

The `dio200_read8()`, `dio200_write8()`, `dio200_read32()` and
`dio200_write32()` functions apply a right-shift to the register offset
for some devices and then perform the actual register access.  Factor
the register access part out to new functions `dio200___read8()`,
`dio200___write8()`, `dio200___read32()`, and `dio200___write32()`.
This will reduce duplicated code in a subsequent patch that will
conditionally compile support for port I/O as part of the `HAS_IOPORT`
changes.

Cc: Arnd Bergmann <arnd@...nel.org>
Cc: Niklas Schnelle <schnelle@...ux.ibm.com>
Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
v2: Correct `HAS_PORTIO` to `HAS_IOPORT` in commit description.
---
 drivers/comedi/drivers/amplc_dio200_common.c | 52 ++++++++++++++------
 1 file changed, 38 insertions(+), 14 deletions(-)

diff --git a/drivers/comedi/drivers/amplc_dio200_common.c b/drivers/comedi/drivers/amplc_dio200_common.c
index 19166cb26f5e..e6d63e89e7bf 100644
--- a/drivers/comedi/drivers/amplc_dio200_common.c
+++ b/drivers/comedi/drivers/amplc_dio200_common.c
@@ -86,6 +86,40 @@ struct dio200_subdev_intr {
 	unsigned int active:1;
 };
 
+static unsigned char dio200___read8(struct comedi_device *dev,
+				    unsigned int offset)
+{
+	if (dev->mmio)
+		return readb(dev->mmio + offset);
+	return inb(dev->iobase + offset);
+}
+
+static void dio200___write8(struct comedi_device *dev,
+			    unsigned int offset, unsigned char val)
+{
+	if (dev->mmio)
+		writeb(val, dev->mmio + offset);
+	else
+		outb(val, dev->iobase + offset);
+}
+
+static unsigned int dio200___read32(struct comedi_device *dev,
+				    unsigned int offset)
+{
+	if (dev->mmio)
+		return readl(dev->mmio + offset);
+	return inl(dev->iobase + offset);
+}
+
+static void dio200___write32(struct comedi_device *dev,
+			     unsigned int offset, unsigned int val)
+{
+	if (dev->mmio)
+		writel(val, dev->mmio + offset);
+	else
+		outl(val, dev->iobase + offset);
+}
+
 static unsigned char dio200_read8(struct comedi_device *dev,
 				  unsigned int offset)
 {
@@ -94,9 +128,7 @@ static unsigned char dio200_read8(struct comedi_device *dev,
 	if (board->is_pcie)
 		offset <<= 3;
 
-	if (dev->mmio)
-		return readb(dev->mmio + offset);
-	return inb(dev->iobase + offset);
+	return dio200___read8(dev, offset);
 }
 
 static void dio200_write8(struct comedi_device *dev,
@@ -107,10 +139,7 @@ static void dio200_write8(struct comedi_device *dev,
 	if (board->is_pcie)
 		offset <<= 3;
 
-	if (dev->mmio)
-		writeb(val, dev->mmio + offset);
-	else
-		outb(val, dev->iobase + offset);
+	dio200___write8(dev, offset, val);
 }
 
 static unsigned int dio200_read32(struct comedi_device *dev,
@@ -121,9 +150,7 @@ static unsigned int dio200_read32(struct comedi_device *dev,
 	if (board->is_pcie)
 		offset <<= 3;
 
-	if (dev->mmio)
-		return readl(dev->mmio + offset);
-	return inl(dev->iobase + offset);
+	return dio200___read32(dev, offset);
 }
 
 static void dio200_write32(struct comedi_device *dev,
@@ -134,10 +161,7 @@ static void dio200_write32(struct comedi_device *dev,
 	if (board->is_pcie)
 		offset <<= 3;
 
-	if (dev->mmio)
-		writel(val, dev->mmio + offset);
-	else
-		outl(val, dev->iobase + offset);
+	dio200___write32(dev, offset, val);
 }
 
 static unsigned int dio200_subdev_8254_offset(struct comedi_device *dev,
-- 
2.40.1