mv643xx_eth: convert to use the Marvell Orion MDIO driver

This patch converts the Marvell MV643XX ethernet driver to use the
Marvell Orion MDIO driver. As a result, PowerPC and ARM platforms
registering the Marvell MV643XX ethernet driver are also updated to
register a Marvell Orion MDIO driver. This driver voluntarily overlaps
with the Marvell Ethernet shared registers because it will use a subset
of this shared register (shared_base + 0x4 to shared_base + 0x84). The
Ethernet driver is also updated to look up for a PHY device using the
Orion MDIO bus driver.

For ARM and PowerPC we register a single instance of the "mvmdio" driver
in the system like it used to be done with the use of the "shared_smi"
platform_data cookie on ARM.

Note that it is safe to register the mvmdio driver only for the "ge00"
instance of the driver because this "ge00" interface is guaranteed to
always be explicitely registered by consumers of
arch/arm/plat-orion/common.c and other instances (ge01, ge10 and ge11)
were all pointing their shared_smi to ge00. For PowerPC the in-tree
Device Tree Source files mention only one MV643XX ethernet MAC instance
so the MDIO bus driver is registered only when id == 0.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 19 insertions, 183 deletions

diff --git a/drivers/net/ethernet/marvell/Kconfig b/drivers/net/ethernet/marvell/Kconfig
index edfba9370922..5170ecb00acc 100644
--- a/drivers/net/ethernet/marvell/Kconfig
+++ b/drivers/net/ethernet/marvell/Kconfig
@@ -23,6 +23,7 @@ config MV643XX_ETH
         depends on (MV64X60 || PPC32 || PLAT_ORION) && INET
         select INET_LRO
         select PHYLIB
+        select MVMDIO
         ---help---
           This driver supports the gigabit ethernet MACs in the
           Marvell Discovery PPC/MIPS chipset family (MV643XX) and
@@ -38,9 +39,7 @@ config MVMDIO
           interface units of the Marvell EBU SoCs (Kirkwood, Orion5x,
           Dove, Armada 370 and Armada XP).
 
-          For now, this driver is only needed for the MVNETA driver
-          (used on Armada 370 and XP), but it could be used in the
-          future by the MV643XX_ETH driver.
+          This driver is used by the MV643XX_ETH and MVNETA drivers.
 
 config MVNETA
         tristate "Marvell Armada 370/XP network interface support"
diff --git a/drivers/net/ethernet/marvell/Makefile b/drivers/net/ethernet/marvell/Makefile
index 7f63b4aac434..5c4a7765ff0e 100644
--- a/drivers/net/ethernet/marvell/Makefile
+++ b/drivers/net/ethernet/marvell/Makefile
@@ -2,8 +2,8 @@
 # Makefile for the Marvell device drivers.
 #
 
-obj-$(CONFIG_MV643XX_ETH) += mv643xx_eth.o
 obj-$(CONFIG_MVMDIO) += mvmdio.o
+obj-$(CONFIG_MV643XX_ETH) += mv643xx_eth.o
 obj-$(CONFIG_MVNETA) += mvneta.o
 obj-$(CONFIG_PXA168_ETH) += pxa168_eth.o
 obj-$(CONFIG_SKGE) += skge.o
diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
index d1ecf4bf7da7..a65a92ef19ec 100644
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -69,14 +69,6 @@ static char mv643xx_eth_driver_version[] = "1.4";
  * Registers shared between all ports.
  */
 #define PHY_ADDR                        0x0000
-#define SMI_REG                         0x0004
-#define  SMI_BUSY                       0x10000000
-#define  SMI_READ_VALID                 0x08000000
-#define  SMI_OPCODE_READ                0x04000000
-#define  SMI_OPCODE_WRITE               0x00000000
-#define ERR_INT_CAUSE                   0x0080
-#define  ERR_INT_SMI_DONE               0x00000010
-#define ERR_INT_MASK                    0x0084
 #define WINDOW_BASE(w)                  (0x0200 + ((w) << 3))
 #define WINDOW_SIZE(w)                  (0x0204 + ((w) << 3))
 #define WINDOW_REMAP_HIGH(w)            (0x0280 + ((w) << 2))
@@ -266,25 +258,6 @@ struct mv643xx_eth_shared_private {
         void __iomem *base;
 
         /*
-         * Points at the right SMI instance to use.
-         */
-        struct mv643xx_eth_shared_private *smi;
-
-        /*
-         * Provides access to local SMI interface.
-         */
-        struct mii_bus *smi_bus;
-
-        /*
-         * If we have access to the error interrupt pin (which is
-         * somewhat misnamed as it not only reflects internal errors
-         * but also reflects SMI completion), use that to wait for
-         * SMI access completion instead of polling the SMI busy bit.
-         */
-        int err_interrupt;
-        wait_queue_head_t smi_busy_wait;
-
-        /*
          * Per-port MBUS window access register value.
          */
         u32 win_protect;
@@ -1122,97 +1095,6 @@ out_write:
         wrlp(mp, PORT_SERIAL_CONTROL, pscr);
 }
 
-static irqreturn_t mv643xx_eth_err_irq(int irq, void *dev_id)
-{
-        struct mv643xx_eth_shared_private *msp = dev_id;
-
-        if (readl(msp->base + ERR_INT_CAUSE) & ERR_INT_SMI_DONE) {
-                writel(~ERR_INT_SMI_DONE, msp->base + ERR_INT_CAUSE);
-                wake_up(&msp->smi_busy_wait);
-                return IRQ_HANDLED;
-        }
-
-        return IRQ_NONE;
-}
-
-static int smi_is_done(struct mv643xx_eth_shared_private *msp)
-{
-        return !(readl(msp->base + SMI_REG) & SMI_BUSY);
-}
-
-static int smi_wait_ready(struct mv643xx_eth_shared_private *msp)
-{
-        if (msp->err_interrupt == NO_IRQ) {
-                int i;
-
-                for (i = 0; !smi_is_done(msp); i++) {
-                        if (i == 10)
-                                return -ETIMEDOUT;
-                        msleep(10);
-                }
-
-                return 0;
-        }
-
-        if (!smi_is_done(msp)) {
-                wait_event_timeout(msp->smi_busy_wait, smi_is_done(msp),
-                                   msecs_to_jiffies(100));
-                if (!smi_is_done(msp))
-                        return -ETIMEDOUT;
-        }
-
-        return 0;
-}
-
-static int smi_bus_read(struct mii_bus *bus, int addr, int reg)
-{
-        struct mv643xx_eth_shared_private *msp = bus->priv;
-        void __iomem *smi_reg = msp->base + SMI_REG;
-        int ret;
-
-        if (smi_wait_ready(msp)) {
-                pr_warn("SMI bus busy timeout\n");
-                return -ETIMEDOUT;
-        }
-
-        writel(SMI_OPCODE_READ | (reg << 21) | (addr << 16), smi_reg);
-
-        if (smi_wait_ready(msp)) {
-                pr_warn("SMI bus busy timeout\n");
-                return -ETIMEDOUT;
-        }
-
-        ret = readl(smi_reg);
-        if (!(ret & SMI_READ_VALID)) {
-                pr_warn("SMI bus read not valid\n");
-                return -ENODEV;
-        }
-
-        return ret & 0xffff;
-}
-
-static int smi_bus_write(struct mii_bus *bus, int addr, int reg, u16 val)
-{
-        struct mv643xx_eth_shared_private *msp = bus->priv;
-        void __iomem *smi_reg = msp->base + SMI_REG;
-
-        if (smi_wait_ready(msp)) {
-                pr_warn("SMI bus busy timeout\n");
-                return -ETIMEDOUT;
-        }
-
-        writel(SMI_OPCODE_WRITE | (reg << 21) |
-                (addr << 16) | (val & 0xffff), smi_reg);
-
-        if (smi_wait_ready(msp)) {
-                pr_warn("SMI bus busy timeout\n");
-                return -ETIMEDOUT;
-        }
-
-        return 0;
-}
-
-
 /* statistics ***************************************************************/
 static struct net_device_stats *mv643xx_eth_get_stats(struct net_device *dev)
 {
@@ -2688,47 +2570,6 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev)
                 goto out_free;
 
         /*
-         * Set up and register SMI bus.
-         */
-        if (pd == NULL || pd->shared_smi == NULL) {
-                msp->smi_bus = mdiobus_alloc();
-                if (msp->smi_bus == NULL)
-                        goto out_unmap;
-
-                msp->smi_bus->priv = msp;
-                msp->smi_bus->name = "mv643xx_eth smi";
-                msp->smi_bus->read = smi_bus_read;
-                msp->smi_bus->write = smi_bus_write,
-                snprintf(msp->smi_bus->id, MII_BUS_ID_SIZE, "%s-%d",
-                        pdev->name, pdev->id);
-                msp->smi_bus->parent = &pdev->dev;
-                msp->smi_bus->phy_mask = 0xffffffff;
-                if (mdiobus_register(msp->smi_bus) < 0)
-                        goto out_free_mii_bus;
-                msp->smi = msp;
-        } else {
-                msp->smi = platform_get_drvdata(pd->shared_smi);
-        }
-
-        msp->err_interrupt = NO_IRQ;
-        init_waitqueue_head(&msp->smi_busy_wait);
-
-        /*
-         * Check whether the error interrupt is hooked up.
-         */
-        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-        if (res != NULL) {
-                int err;
-
-                err = request_irq(res->start, mv643xx_eth_err_irq,
-                                  IRQF_SHARED, "mv643xx_eth", msp);
-                if (!err) {
-                        writel(ERR_INT_SMI_DONE, msp->base + ERR_INT_MASK);
-                        msp->err_interrupt = res->start;
-                }
-        }
-
-        /*
          * (Re-)program MBUS remapping windows if we are asked to.
          */
         dram = mv_mbus_dram_info();
@@ -2743,10 +2584,6 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev)
 
         return 0;
 
-out_free_mii_bus:
-        mdiobus_free(msp->smi_bus);
-out_unmap:
-        iounmap(msp->base);
 out_free:
         kfree(msp);
 out:
@@ -2756,14 +2593,7 @@ out:
 static int mv643xx_eth_shared_remove(struct platform_device *pdev)
 {
         struct mv643xx_eth_shared_private *msp = platform_get_drvdata(pdev);
-        struct mv643xx_eth_shared_platform_data *pd = pdev->dev.platform_data;
 
-        if (pd == NULL || pd->shared_smi == NULL) {
-                mdiobus_unregister(msp->smi_bus);
-                mdiobus_free(msp->smi_bus);
-        }
-        if (msp->err_interrupt != NO_IRQ)
-                free_irq(msp->err_interrupt, msp);
         iounmap(msp->base);
         kfree(msp);
 
@@ -2826,14 +2656,21 @@ static void set_params(struct mv643xx_eth_private *mp,
         mp->txq_count = pd->tx_queue_count ? : 1;
 }
 
+static void mv643xx_eth_adjust_link(struct net_device *dev)
+{
+        struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+        mv643xx_adjust_pscr(mp);
+}
+
 static struct phy_device *phy_scan(struct mv643xx_eth_private *mp,
                                    int phy_addr)
 {
-        struct mii_bus *bus = mp->shared->smi->smi_bus;
         struct phy_device *phydev;
         int start;
         int num;
         int i;
+        char phy_id[MII_BUS_ID_SIZE + 3];
 
         if (phy_addr == MV643XX_ETH_PHY_ADDR_DEFAULT) {
                 start = phy_addr_get(mp) & 0x1f;
@@ -2843,17 +2680,19 @@ static struct phy_device *phy_scan(struct mv643xx_eth_private *mp,
                 num = 1;
         }
 
+        /* Attempt to connect to the PHY using orion-mdio */
         phydev = NULL;
         for (i = 0; i < num; i++) {
                 int addr = (start + i) & 0x1f;
 
-                if (bus->phy_map[addr] == NULL)
-                        mdiobus_scan(bus, addr);
+                snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
+                                "orion-mdio-mii", addr);
 
-                if (phydev == NULL) {
-                        phydev = bus->phy_map[addr];
-                        if (phydev != NULL)
-                                phy_addr_set(mp, addr);
+                phydev = phy_connect(mp->dev, phy_id, mv643xx_eth_adjust_link,
+                                PHY_INTERFACE_MODE_GMII);
+                if (!IS_ERR(phydev)) {
+                        phy_addr_set(mp, addr);
+                        break;
                 }
         }
 
@@ -2866,8 +2705,6 @@ static void phy_init(struct mv643xx_eth_private *mp, int speed, int duplex)
 
         phy_reset(mp);
 
-        phy_attach(mp->dev, dev_name(&phy->dev), PHY_INTERFACE_MODE_GMII);
-
         if (speed == 0) {
                 phy->autoneg = AUTONEG_ENABLE;
                 phy->speed = 0;