1 files changed, 246 insertions, 0 deletions

diff --git a/drivers/net/fs_enet/mii-bitbang.c b/drivers/net/fs_enet/mii-bitbang.c
new file mode 100644
index 00000000000..b09270b5d0a
--- /dev/null
+++ b/drivers/net/fs_enet/mii-bitbang.c
@@ -0,0 +1,246 @@
+/*
+ * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
+ *
+ * Copyright (c) 2003 Intracom S.A.
+ *  by Pantelis Antoniou <panto@intracom.gr>
+ *
+ * 2005 (c) MontaVista Software, Inc.
+ * Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * 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/module.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/mii.h>
+#include <linux/platform_device.h>
+#include <linux/mdio-bitbang.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+
+#include "fs_enet.h"
+
+struct bb_info {
+        struct mdiobb_ctrl ctrl;
+        __be32 __iomem *dir;
+        __be32 __iomem *dat;
+        u32 mdio_msk;
+        u32 mdc_msk;
+};
+
+/* FIXME: If any other users of GPIO crop up, then these will have to
+ * have some sort of global synchronization to avoid races with other
+ * pins on the same port.  The ideal solution would probably be to
+ * bind the ports to a GPIO driver, and have this be a client of it.
+ */
+static inline void bb_set(u32 __iomem *p, u32 m)
+{
+        out_be32(p, in_be32(p) | m);
+}
+
+static inline void bb_clr(u32 __iomem *p, u32 m)
+{
+        out_be32(p, in_be32(p) & ~m);
+}
+
+static inline int bb_read(u32 __iomem *p, u32 m)
+{
+        return (in_be32(p) & m) != 0;
+}
+
+static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
+{
+        struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+
+        if (dir)
+                bb_set(bitbang->dir, bitbang->mdio_msk);
+        else
+                bb_clr(bitbang->dir, bitbang->mdio_msk);
+
+        /* Read back to flush the write. */
+        in_be32(bitbang->dir);
+}
+
+static inline int mdio_read(struct mdiobb_ctrl *ctrl)
+{
+        struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+        return bb_read(bitbang->dat, bitbang->mdio_msk);
+}
+
+static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
+{
+        struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+
+        if (what)
+                bb_set(bitbang->dat, bitbang->mdio_msk);
+        else
+                bb_clr(bitbang->dat, bitbang->mdio_msk);
+
+        /* Read back to flush the write. */
+        in_be32(bitbang->dat);
+}
+
+static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
+{
+        struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+
+        if (what)
+                bb_set(bitbang->dat, bitbang->mdc_msk);
+        else
+                bb_clr(bitbang->dat, bitbang->mdc_msk);
+
+        /* Read back to flush the write. */
+        in_be32(bitbang->dat);
+}
+
+static struct mdiobb_ops bb_ops = {
+        .owner = THIS_MODULE,
+        .set_mdc = mdc,
+        .set_mdio_dir = mdio_dir,
+        .set_mdio_data = mdio,
+        .get_mdio_data = mdio_read,
+};
+
+static int __devinit fs_mii_bitbang_init(struct mii_bus *bus,
+                                         struct device_node *np)
+{
+        struct resource res;
+        const u32 *data;
+        int mdio_pin, mdc_pin, len;
+        struct bb_info *bitbang = bus->priv;
+
+        int ret = of_address_to_resource(np, 0, &res);
+        if (ret)
+                return ret;
+
+        if (resource_size(&res) <= 13)
+                return -ENODEV;
+
+        /* This should really encode the pin number as well, but all
+         * we get is an int, and the odds of multiple bitbang mdio buses
+         * is low enough that it's not worth going too crazy.
+         */
+        snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
+
+        data = of_get_property(np, "fsl,mdio-pin", &len);
+        if (!data || len != 4)
+                return -ENODEV;
+        mdio_pin = *data;
+
+        data = of_get_property(np, "fsl,mdc-pin", &len);
+        if (!data || len != 4)
+                return -ENODEV;
+        mdc_pin = *data;
+
+        bitbang->dir = ioremap(res.start, resource_size(&res));
+        if (!bitbang->dir)
+                return -ENOMEM;
+
+        bitbang->dat = bitbang->dir + 4;
+        bitbang->mdio_msk = 1 << (31 - mdio_pin);
+        bitbang->mdc_msk = 1 << (31 - mdc_pin);
+
+        return 0;
+}
+
+static int __devinit fs_enet_mdio_probe(struct platform_device *ofdev)
+{
+        struct mii_bus *new_bus;
+        struct bb_info *bitbang;
+        int ret = -ENOMEM;
+
+        bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
+        if (!bitbang)
+                goto out;
+
+        bitbang->ctrl.ops = &bb_ops;
+
+        new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
+        if (!new_bus)
+                goto out_free_priv;
+
+        new_bus->name = "CPM2 Bitbanged MII",
+
+        ret = fs_mii_bitbang_init(new_bus, ofdev->dev.of_node);
+        if (ret)
+                goto out_free_bus;
+
+        new_bus->phy_mask = ~0;
+        new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
+        if (!new_bus->irq)
+                goto out_unmap_regs;
+
+        new_bus->parent = &ofdev->dev;
+        dev_set_drvdata(&ofdev->dev, new_bus);
+
+        ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
+        if (ret)
+                goto out_free_irqs;
+
+        return 0;
+
+out_free_irqs:
+        dev_set_drvdata(&ofdev->dev, NULL);
+        kfree(new_bus->irq);
+out_unmap_regs:
+        iounmap(bitbang->dir);
+out_free_bus:
+        free_mdio_bitbang(new_bus);
+out_free_priv:
+        kfree(bitbang);
+out:
+        return ret;
+}
+
+static int fs_enet_mdio_remove(struct platform_device *ofdev)
+{
+        struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
+        struct bb_info *bitbang = bus->priv;
+
+        mdiobus_unregister(bus);
+        dev_set_drvdata(&ofdev->dev, NULL);
+        kfree(bus->irq);
+        free_mdio_bitbang(bus);
+        iounmap(bitbang->dir);
+        kfree(bitbang);
+
+        return 0;
+}
+
+static struct of_device_id fs_enet_mdio_bb_match[] = {
+        {
+                .compatible = "fsl,cpm2-mdio-bitbang",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, fs_enet_mdio_bb_match);
+
+static struct platform_driver fs_enet_bb_mdio_driver = {
+        .driver = {
+                .name = "fsl-bb-mdio",
+                .owner = THIS_MODULE,
+                .of_match_table = fs_enet_mdio_bb_match,
+        },
+        .probe = fs_enet_mdio_probe,
+        .remove = fs_enet_mdio_remove,
+};
+
+static int fs_enet_mdio_bb_init(void)
+{
+        return platform_driver_register(&fs_enet_bb_mdio_driver);
+}
+
+static void fs_enet_mdio_bb_exit(void)
+{
+        platform_driver_unregister(&fs_enet_bb_mdio_driver);
+}
+
+module_init(fs_enet_mdio_bb_init);
+module_exit(fs_enet_mdio_bb_exit);