3 files changed, 192 insertions, 0 deletions

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index d5d8e1c5bc9..fc5938ba3d7 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -115,4 +115,15 @@ config MDIO_GPIO
           To compile this driver as a module, choose M here: the module
           will be called mdio-gpio.
 
+config MDIO_OCTEON
+        tristate "Support for MDIO buses on Octeon SOCs"
+        depends on  CPU_CAVIUM_OCTEON
+        default y
+        help
+
+          This module provides a driver for the Octeon MDIO busses.
+          It is required by the Octeon Ethernet device drivers.
+
+          If in doubt, say Y.
+
 endif # PHYLIB
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index edfaac48cbd..1342585af38 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -20,3 +20,4 @@ obj-$(CONFIG_MDIO_BITBANG)	+= mdio-bitbang.o
 obj-$(CONFIG_MDIO_GPIO)         += mdio-gpio.o
 obj-$(CONFIG_NATIONAL_PHY)      += national.o
 obj-$(CONFIG_STE10XP)           += ste10Xp.o
+obj-$(CONFIG_MDIO_OCTEON)       += mdio-octeon.o
diff --git a/drivers/net/phy/mdio-octeon.c b/drivers/net/phy/mdio-octeon.c
new file mode 100644
index 00000000000..61a4461cbda
--- /dev/null
+++ b/drivers/net/phy/mdio-octeon.c
@@ -0,0 +1,180 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009 Cavium Networks
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/phy.h>
+
+#include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-smix-defs.h>
+
+#define DRV_VERSION "1.0"
+#define DRV_DESCRIPTION "Cavium Networks Octeon SMI/MDIO driver"
+
+struct octeon_mdiobus {
+        struct mii_bus *mii_bus;
+        int unit;
+        int phy_irq[PHY_MAX_ADDR];
+};
+
+static int octeon_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
+{
+        struct octeon_mdiobus *p = bus->priv;
+        union cvmx_smix_cmd smi_cmd;
+        union cvmx_smix_rd_dat smi_rd;
+        int timeout = 1000;
+
+        smi_cmd.u64 = 0;
+        smi_cmd.s.phy_op = 1; /* MDIO_CLAUSE_22_READ */
+        smi_cmd.s.phy_adr = phy_id;
+        smi_cmd.s.reg_adr = regnum;
+        cvmx_write_csr(CVMX_SMIX_CMD(p->unit), smi_cmd.u64);
+
+        do {
+                /*
+                 * Wait 1000 clocks so we don't saturate the RSL bus
+                 * doing reads.
+                 */
+                cvmx_wait(1000);
+                smi_rd.u64 = cvmx_read_csr(CVMX_SMIX_RD_DAT(p->unit));
+        } while (smi_rd.s.pending && --timeout);
+
+        if (smi_rd.s.val)
+                return smi_rd.s.dat;
+        else
+                return -EIO;
+}
+
+static int octeon_mdiobus_write(struct mii_bus *bus, int phy_id,
+                                int regnum, u16 val)
+{
+        struct octeon_mdiobus *p = bus->priv;
+        union cvmx_smix_cmd smi_cmd;
+        union cvmx_smix_wr_dat smi_wr;
+        int timeout = 1000;
+
+        smi_wr.u64 = 0;
+        smi_wr.s.dat = val;
+        cvmx_write_csr(CVMX_SMIX_WR_DAT(p->unit), smi_wr.u64);
+
+        smi_cmd.u64 = 0;
+        smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_22_WRITE */
+        smi_cmd.s.phy_adr = phy_id;
+        smi_cmd.s.reg_adr = regnum;
+        cvmx_write_csr(CVMX_SMIX_CMD(p->unit), smi_cmd.u64);
+
+        do {
+                /*
+                 * Wait 1000 clocks so we don't saturate the RSL bus
+                 * doing reads.
+                 */
+                cvmx_wait(1000);
+                smi_wr.u64 = cvmx_read_csr(CVMX_SMIX_WR_DAT(p->unit));
+        } while (smi_wr.s.pending && --timeout);
+
+        if (timeout <= 0)
+                return -EIO;
+
+        return 0;
+}
+
+static int __init octeon_mdiobus_probe(struct platform_device *pdev)
+{
+        struct octeon_mdiobus *bus;
+        int i;
+        int err = -ENOENT;
+
+        bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
+        if (!bus)
+                return -ENOMEM;
+
+        /* The platform_device id is our unit number.  */
+        bus->unit = pdev->id;
+
+        bus->mii_bus = mdiobus_alloc();
+
+        if (!bus->mii_bus)
+                goto err;
+
+        /*
+         * Standard Octeon evaluation boards don't support phy
+         * interrupts, we need to poll.
+         */
+        for (i = 0; i < PHY_MAX_ADDR; i++)
+                bus->phy_irq[i] = PHY_POLL;
+
+        bus->mii_bus->priv = bus;
+        bus->mii_bus->irq = bus->phy_irq;
+        bus->mii_bus->name = "mdio-octeon";
+        snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%x", bus->unit);
+        bus->mii_bus->parent = &pdev->dev;
+
+        bus->mii_bus->read = octeon_mdiobus_read;
+        bus->mii_bus->write = octeon_mdiobus_write;
+
+        dev_set_drvdata(&pdev->dev, bus);
+
+        err = mdiobus_register(bus->mii_bus);
+        if (err)
+                goto err_register;
+
+        dev_info(&pdev->dev, "Version " DRV_VERSION "\n");
+
+        return 0;
+err_register:
+        mdiobus_free(bus->mii_bus);
+
+err:
+        devm_kfree(&pdev->dev, bus);
+        return err;
+}
+
+static int __exit octeon_mdiobus_remove(struct platform_device *pdev)
+{
+        struct octeon_mdiobus *bus;
+
+        bus = dev_get_drvdata(&pdev->dev);
+
+        mdiobus_unregister(bus->mii_bus);
+        mdiobus_free(bus->mii_bus);
+        return 0;
+}
+
+static struct platform_driver octeon_mdiobus_driver = {
+        .driver = {
+                .name           = "mdio-octeon",
+                .owner          = THIS_MODULE,
+        },
+        .probe          = octeon_mdiobus_probe,
+        .remove         = __exit_p(octeon_mdiobus_remove),
+};
+
+void octeon_mdiobus_force_mod_depencency(void)
+{
+        /* Let ethernet drivers force us to be loaded.  */
+}
+EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
+
+static int __init octeon_mdiobus_mod_init(void)
+{
+        return platform_driver_register(&octeon_mdiobus_driver);
+}
+
+static void __exit octeon_mdiobus_mod_exit(void)
+{
+        platform_driver_unregister(&octeon_mdiobus_driver);
+}
+
+module_init(octeon_mdiobus_mod_init);
+module_exit(octeon_mdiobus_mod_exit);
+
+MODULE_DESCRIPTION(DRV_DESCRIPTION);
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("David Daney");
+MODULE_LICENSE("GPL");