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path: root/drivers/net/ethernet/freescale/fec_mpc52xx_phy.c
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Diffstat (limited to 'drivers/net/ethernet/freescale/fec_mpc52xx_phy.c')
-rw-r--r--drivers/net/ethernet/freescale/fec_mpc52xx_phy.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/drivers/net/ethernet/freescale/fec_mpc52xx_phy.c b/drivers/net/ethernet/freescale/fec_mpc52xx_phy.c
new file mode 100644
index 000000000..95f778cce
--- /dev/null
+++ b/drivers/net/ethernet/freescale/fec_mpc52xx_phy.c
@@ -0,0 +1,154 @@
+/*
+ * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
+ *
+ * Copyright (C) 2007 Domen Puncer, Telargo, Inc.
+ * Copyright (C) 2008 Wolfram Sang, Pengutronix
+ *
+ * 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 <linux/slab.h>
+#include <linux/of_address.h>
+#include <linux/of_mdio.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_transfer(struct mii_bus *bus, int phy_id,
+ int reg, u32 value)
+{
+ struct mpc52xx_fec_mdio_priv *priv = bus->priv;
+ struct mpc52xx_fec __iomem *fec = priv->regs;
+ int tries = 3;
+
+ 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(&fec->ievent, FEC_IEVENT_MII);
+ out_be32(&fec->mii_data, value);
+
+ /* wait for it to finish, this takes about 23 us on lite5200b */
+ while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
+ msleep(1);
+
+ if (!tries)
+ return -ETIMEDOUT;
+
+ return value & FEC_MII_DATA_OP_RD ?
+ in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0;
+}
+
+static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+{
+ return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
+}
+
+static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
+ u16 data)
+{
+ return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
+ data | FEC_MII_WRITE_FRAME);
+}
+
+static int mpc52xx_fec_mdio_probe(struct platform_device *of)
+{
+ struct device *dev = &of->dev;
+ struct device_node *np = of->dev.of_node;
+ struct mii_bus *bus;
+ struct mpc52xx_fec_mdio_priv *priv;
+ struct resource res;
+ int err;
+
+ bus = mdiobus_alloc();
+ 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 registers */
+ err = of_address_to_resource(np, 0, &res);
+ if (err)
+ goto out_free;
+ priv->regs = ioremap(res.start, resource_size(&res));
+ if (priv->regs == NULL) {
+ err = -ENOMEM;
+ goto out_free;
+ }
+
+ snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
+ bus->priv = priv;
+
+ bus->parent = dev;
+ dev_set_drvdata(dev, bus);
+
+ /* set MII speed */
+ out_be32(&priv->regs->mii_speed, ((mpc5xxx_get_bus_frequency(dev) >> 20) / 5) << 1);
+
+ err = of_mdiobus_register(bus, np);
+ if (err)
+ goto out_unmap;
+
+ return 0;
+
+ out_unmap:
+ iounmap(priv->regs);
+ out_free:
+ kfree(priv);
+ mdiobus_free(bus);
+
+ return err;
+}
+
+static int mpc52xx_fec_mdio_remove(struct platform_device *of)
+{
+ struct mii_bus *bus = platform_get_drvdata(of);
+ struct mpc52xx_fec_mdio_priv *priv = bus->priv;
+
+ mdiobus_unregister(bus);
+ iounmap(priv->regs);
+ kfree(priv);
+ mdiobus_free(bus);
+
+ return 0;
+}
+
+static const struct of_device_id mpc52xx_fec_mdio_match[] = {
+ { .compatible = "fsl,mpc5200b-mdio", },
+ { .compatible = "fsl,mpc5200-mdio", },
+ { .compatible = "mpc5200b-fec-phy", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
+
+struct platform_driver mpc52xx_fec_mdio_driver = {
+ .driver = {
+ .name = "mpc5200b-fec-phy",
+ .owner = THIS_MODULE,
+ .of_match_table = mpc52xx_fec_mdio_match,
+ },
+ .probe = mpc52xx_fec_mdio_probe,
+ .remove = mpc52xx_fec_mdio_remove,
+};
+
+/* 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");