FEC - fast ethernet controller for mpc52xx

Driver for ethernet on mpc5200/mpc5200b SoCs (FEC).

Signed-off-by: Domen Puncer <domen.puncer@telargo.com>
Acked-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 198 insertions, 0 deletions

diff --git a/drivers/net/fec_mpc52xx_phy.c b/drivers/net/fec_mpc52xx_phy.c
new file mode 100644
index 00000000000..ba6e8b218e0
--- /dev/null
+++ b/drivers/net/fec_mpc52xx_phy.c
@@ -0,0 +1,198 @@
+/*
+ * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
+ *
+ * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <linux/of_platform.h>
+#include <asm/io.h>
+#include <asm/mpc52xx.h>
+#include "fec_mpc52xx.h"
+
+struct mpc52xx_fec_mdio_priv {
+	struct mpc52xx_fec __iomem *regs;
+};
+
+static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+{
+	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
+	struct mpc52xx_fec __iomem *fec;
+	int tries = 100;
+	u32 request = FEC_MII_READ_FRAME;
+
+	fec = priv->regs;
+	out_be32(&fec->ievent, FEC_IEVENT_MII);
+
+	request |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
+	request |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
+
+	out_be32(&priv->regs->mii_data, request);
+
+	/* wait for it to finish, this takes about 23 us on lite5200b */
+	while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
+		udelay(5);
+
+	if (tries == 0)
+		return -ETIMEDOUT;
+
+	return in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK;
+}
+
+static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
+{
+	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
+	struct mpc52xx_fec __iomem *fec;
+	u32 value = data;
+	int tries = 100;
+
+	fec = priv->regs;
+	out_be32(&fec->ievent, FEC_IEVENT_MII);
+
+	value |= FEC_MII_WRITE_FRAME;
+	value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
+	value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
+
+	out_be32(&priv->regs->mii_data, value);
+
+	/* wait for request to finish */
+	while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
+		udelay(5);
+
+	if (tries == 0)
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int mpc52xx_fec_mdio_probe(struct of_device *of, const struct of_device_id *match)
+{
+	struct device *dev = &of->dev;
+	struct device_node *np = of->node;
+	struct device_node *child = NULL;
+	struct mii_bus *bus;
+	struct mpc52xx_fec_mdio_priv *priv;
+	struct resource res = {};
+	int err;
+	int i;
+
+	bus = kzalloc(sizeof(*bus), GFP_KERNEL);
+	if (bus == NULL)
+		return -ENOMEM;
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (priv == NULL) {
+		err = -ENOMEM;
+		goto out_free;
+	}
+
+	bus->name = "mpc52xx MII bus";
+	bus->read = mpc52xx_fec_mdio_read;
+	bus->write = mpc52xx_fec_mdio_write;
+
+	/* setup irqs */
+	bus->irq = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL);
+	if (bus->irq == NULL) {
+		err = -ENOMEM;
+		goto out_free;
+	}
+	for (i=0; i<PHY_MAX_ADDR; i++)
+		bus->irq[i] = PHY_POLL;
+
+	while ((child = of_get_next_child(np, child)) != NULL) {
+		int irq = irq_of_parse_and_map(child, 0);
+		if (irq != NO_IRQ) {
+			const u32 *id = of_get_property(child, "reg", NULL);
+			bus->irq[*id] = irq;
+		}
+	}
+
+	/* setup registers */
+	err = of_address_to_resource(np, 0, &res);
+	if (err)
+		goto out_free;
+	priv->regs = ioremap(res.start, res.end - res.start + 1);
+	if (priv->regs == NULL) {
+		err = -ENOMEM;
+		goto out_free;
+	}
+
+	bus->id = res.start;
+	bus->priv = priv;
+
+	bus->dev = dev;
+	dev_set_drvdata(dev, bus);
+
+	/* set MII speed */
+	out_be32(&priv->regs->mii_speed, ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
+
+	/* enable MII interrupt */
+	out_be32(&priv->regs->imask, in_be32(&priv->regs->imask) | FEC_IMASK_MII);
+
+	err = mdiobus_register(bus);
+	if (err)
+		goto out_unmap;
+
+	return 0;
+
+ out_unmap:
+	iounmap(priv->regs);
+ out_free:
+	for (i=0; i<PHY_MAX_ADDR; i++)
+		if (bus->irq[i] != PHY_POLL)
+			irq_dispose_mapping(bus->irq[i]);
+	kfree(bus->irq);
+	kfree(priv);
+	kfree(bus);
+
+	return err;
+}
+
+static int mpc52xx_fec_mdio_remove(struct of_device *of)
+{
+	struct device *dev = &of->dev;
+	struct mii_bus *bus = dev_get_drvdata(dev);
+	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
+	int i;
+
+	mdiobus_unregister(bus);
+	dev_set_drvdata(dev, NULL);
+
+	iounmap(priv->regs);
+	for (i=0; i<PHY_MAX_ADDR; i++)
+		if (bus->irq[i])
+			irq_dispose_mapping(bus->irq[i]);
+	kfree(priv);
+	kfree(bus->irq);
+	kfree(bus);
+
+	return 0;
+}
+
+
+static struct of_device_id mpc52xx_fec_mdio_match[] = {
+	{
+		.type = "mdio",
+		.compatible = "mpc5200b-fec-phy",
+	},
+	{},
+};
+
+struct of_platform_driver mpc52xx_fec_mdio_driver = {
+	.name = "mpc5200b-fec-phy",
+	.probe = mpc52xx_fec_mdio_probe,
+	.remove = mpc52xx_fec_mdio_remove,
+	.match_table = mpc52xx_fec_mdio_match,
+};
+
+/* let fec driver call it, since this has to be registered before it */
+EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
+
+
+MODULE_LICENSE("Dual BSD/GPL");