netdev - [PATCH 5/9] net: mvmdio: introduce an ops structure

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Message-Id: <20170607083810.30922-6-antoine.tenart@free-electrons.com>
Date:   Wed,  7 Jun 2017 10:38:06 +0200
From:   Antoine Tenart <antoine.tenart@...e-electrons.com>
To:     davem@...emloft.net, jason@...edaemon.net, andrew@...n.ch,
        gregory.clement@...e-electrons.com,
        sebastian.hesselbarth@...il.com, f.fainelli@...il.com
Cc:     Antoine Tenart <antoine.tenart@...e-electrons.com>,
        thomas.petazzoni@...e-electrons.com, mw@...ihalf.com,
        linux@...linux.org.uk, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 5/9] net: mvmdio: introduce an ops structure

Introduce an ops structure to add an indirection on functions accessing
the registers. This is needed to add the xMDIO support later.

Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
---
 drivers/net/ethernet/marvell/mvmdio.c | 65 +++++++++++++++++++++++++++--------
 1 file changed, 51 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c
index 56bbe3990590..8a71ef93a61b 100644
--- a/drivers/net/ethernet/marvell/mvmdio.c
+++ b/drivers/net/ethernet/marvell/mvmdio.c
@@ -62,6 +62,15 @@ struct orion_mdio_dev {
 	 */
 	int err_interrupt;
 	wait_queue_head_t smi_busy_wait;
+	struct orion_mdio_ops *ops;
+};
+
+struct orion_mdio_ops {
+	int (*is_done)(struct orion_mdio_dev *);
+	int (*is_read_valid)(struct orion_mdio_dev *);
+	void (*start_read)(struct orion_mdio_dev *, int, int);
+	u16 (*read)(struct orion_mdio_dev *);
+	void (*write)(struct orion_mdio_dev *, int, int, u16);
 };
 
 static int orion_mdio_smi_is_done(struct orion_mdio_dev *dev)
@@ -74,6 +83,30 @@ static int orion_mdio_smi_is_read_valid(struct orion_mdio_dev *dev)
 	return !(readl(dev->regs) & MVMDIO_SMI_READ_VALID);
 }
 
+static void orion_mdio_start_read_op(struct orion_mdio_dev *dev, int mii_id,
+				     int regnum)
+{
+	writel(((mii_id << MVMDIO_SMI_PHY_ADDR_SHIFT) |
+		(regnum << MVMDIO_SMI_PHY_REG_SHIFT)  |
+		MVMDIO_SMI_READ_OPERATION),
+	       dev->regs);
+}
+
+static u16 orion_mdio_read_op(struct orion_mdio_dev *dev)
+{
+	return readl(dev->regs) & GENMASK(15,0);
+}
+
+static void orion_mdio_write_op(struct orion_mdio_dev *dev, int mii_id,
+				int regnum, u16 value)
+{
+	writel(((mii_id << MVMDIO_SMI_PHY_ADDR_SHIFT) |
+		(regnum << MVMDIO_SMI_PHY_REG_SHIFT)  |
+		MVMDIO_SMI_WRITE_OPERATION            |
+		(value << MVMDIO_SMI_DATA_SHIFT)),
+	       dev->regs);
+}
+
 /* Wait for the SMI unit to be ready for another operation
  */
 static int orion_mdio_wait_ready(struct mii_bus *bus)
@@ -84,7 +117,7 @@ static int orion_mdio_wait_ready(struct mii_bus *bus)
 	int timedout = 0;
 
 	while (1) {
-	        if (orion_mdio_smi_is_done(dev))
+	        if (dev->ops->is_done(dev))
 			return 0;
 	        else if (timedout)
 			break;
@@ -103,8 +136,7 @@ static int orion_mdio_wait_ready(struct mii_bus *bus)
 			if (timeout < 2)
 				timeout = 2;
 			wait_event_timeout(dev->smi_busy_wait,
-				           orion_mdio_smi_is_done(dev),
-				           timeout);
+				           dev->ops->is_done(dev), timeout);
 
 			++timedout;
 	        }
@@ -126,22 +158,19 @@ static int orion_mdio_read(struct mii_bus *bus, int mii_id,
 	if (ret < 0)
 		goto out;
 
-	writel(((mii_id << MVMDIO_SMI_PHY_ADDR_SHIFT) |
-		(regnum << MVMDIO_SMI_PHY_REG_SHIFT)  |
-		MVMDIO_SMI_READ_OPERATION),
-	       dev->regs);
+	dev->ops->start_read(dev, mii_id, regnum);
 
 	ret = orion_mdio_wait_ready(bus);
 	if (ret < 0)
 		goto out;
 
-	if (orion_mdio_smi_is_read_valid(dev)) {
+	if (dev->ops->is_read_valid(dev)) {
 		dev_err(bus->parent, "SMI bus read not valid\n");
 		ret = -ENODEV;
 		goto out;
 	}
 
-	ret = readl(dev->regs) & GENMASK(15,0);
+	ret = dev->ops->read(dev);
 out:
 	mutex_unlock(&dev->lock);
 	return ret;
@@ -159,11 +188,7 @@ static int orion_mdio_write(struct mii_bus *bus, int mii_id,
 	if (ret < 0)
 		goto out;
 
-	writel(((mii_id << MVMDIO_SMI_PHY_ADDR_SHIFT) |
-		(regnum << MVMDIO_SMI_PHY_REG_SHIFT)  |
-		MVMDIO_SMI_WRITE_OPERATION            |
-		(value << MVMDIO_SMI_DATA_SHIFT)),
-	       dev->regs);
+	dev->ops->write(dev, mii_id, regnum, value);
 
 out:
 	mutex_unlock(&dev->lock);
@@ -190,6 +215,7 @@ static int orion_mdio_probe(struct platform_device *pdev)
 	struct resource *r;
 	struct mii_bus *bus;
 	struct orion_mdio_dev *dev;
+	struct orion_mdio_ops *ops;
 	int i, ret;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -249,6 +275,17 @@ static int orion_mdio_probe(struct platform_device *pdev)
 
 	mutex_init(&dev->lock);
 
+	ops = devm_kzalloc(&pdev->dev, sizeof(*ops), GFP_KERNEL);
+	if (!ops)
+		return -ENOMEM;
+
+	ops->is_done = orion_mdio_smi_is_done;
+	ops->is_read_valid = orion_mdio_smi_is_read_valid;
+	ops->start_read = orion_mdio_start_read_op;
+	ops->read = orion_mdio_read_op;
+	ops->write = orion_mdio_write_op;
+	dev->ops = ops;
+
 	if (pdev->dev.of_node)
 		ret = of_mdiobus_register(bus, pdev->dev.of_node);
 	else
-- 
2.9.4