ethernet: arc: Add support for specific SoC layer device tree bindings

Some platforms have special bank registers which might be used to
select the correct clock or the right mode for Media Indepent Interface
controllers. Sometimes, it is also required to activate vcc regulators
in the right order to supply the ethernet controller at the right time.
This patch is an architecture refactoring of the arc-emac device driver.
It adds a new software design which allows to add specific platform
glue layer. Each platform has now its own module which performs custom
initialization and remove for the target and then calls to the
core driver.

Signed-off-by: Romain Perier <romain.perier@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 95 insertions, 0 deletions

diff --git a/drivers/net/ethernet/arc/emac_arc.c b/drivers/net/ethernet/arc/emac_arc.c
new file mode 100644
index 000000000000..f9cb99bfb511
--- /dev/null
+++ b/drivers/net/ethernet/arc/emac_arc.c
@@ -0,0 +1,95 @@
+/**
+ * emac_arc.c - ARC EMAC specific glue layer
+ *
+ * Copyright (C) 2014 Romain Perier
+ *
+ * Romain Perier  <romain.perier@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/module.h>
+#include <linux/of_net.h>
+#include <linux/platform_device.h>
+
+#include "emac.h"
+
+#define DRV_NAME    "emac_arc"
+#define DRV_VERSION "1.0"
+
+static int emac_arc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct net_device *ndev;
+	struct arc_emac_priv *priv;
+	int interface, err;
+
+	if (!dev->of_node)
+		return -ENODEV;
+
+	ndev = alloc_etherdev(sizeof(struct arc_emac_priv));
+	if (!ndev)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, ndev);
+	SET_NETDEV_DEV(ndev, dev);
+
+	priv = netdev_priv(ndev);
+	priv->drv_name = DRV_NAME;
+	priv->drv_version = DRV_VERSION;
+
+	interface = of_get_phy_mode(dev->of_node);
+	if (interface < 0)
+		interface = PHY_INTERFACE_MODE_MII;
+
+	priv->clk = devm_clk_get(dev, "hclk");
+	if (IS_ERR(priv->clk)) {
+		dev_err(dev, "failed to retrieve host clock from device tree\n");
+		err = -EINVAL;
+		goto out_netdev;
+	}
+
+	err = arc_emac_probe(ndev, interface);
+out_netdev:
+	if (err)
+		free_netdev(ndev);
+	return err;
+}
+
+static int emac_arc_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	int err;
+
+	err = arc_emac_remove(ndev);
+	free_netdev(ndev);
+	return err;
+}
+
+static const struct of_device_id emac_arc_dt_ids[] = {
+	{ .compatible = "snps,arc-emac" },
+	{ /* Sentinel */ }
+};
+
+static struct platform_driver emac_arc_driver = {
+	.probe = emac_arc_probe,
+	.remove = emac_arc_remove,
+	.driver = {
+		.name = DRV_NAME,
+		.of_match_table  = emac_arc_dt_ids,
+	},
+};
+
+module_platform_driver(emac_arc_driver);
+
+MODULE_AUTHOR("Romain Perier <romain.perier@gmail.com>");
+MODULE_DESCRIPTION("ARC EMAC platform driver");
+MODULE_LICENSE("GPL");