net: Add MSCC ServalT network driver.
authorHoratiu Vultur <horatiu.vultur@microchip.com>
Mon, 8 Apr 2019 08:31:36 +0000 (10:31 +0200)
committerDaniel Schwierzeck <daniel.schwierzeck@gmail.com>
Fri, 12 Apr 2019 15:32:52 +0000 (17:32 +0200)
Add network driver for Microsemi Ethernet switch.
It is present on ServalT SoCs.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
arch/mips/mach-mscc/include/mach/servalt/servalt_devcpu_gcb.h
drivers/net/mscc_eswitch/Kconfig
drivers/net/mscc_eswitch/Makefile
drivers/net/mscc_eswitch/servalt_switch.c [new file with mode: 0644]

index f6e724588a9c5fcb0b4617719e418a7352228ea1..493eaad1df7fdc4e93b4e6ebd12032944070850b 100644 (file)
@@ -17,4 +17,6 @@
 #define GPIO_GPIO_ALT(x)                                  (0x74 + 4 * (x))
 #define GPIO_GPIO_ALT1(x)                                 (0x7c + 4 * (x))
 
+#define GCB_PHY_CFG                                       0x118
+
 #endif
index 3f9d14bee1991b418b15253693296b206f01c116..6359d0b61015915b7a0f63cdff9bd056e77fed3f 100644 (file)
@@ -22,3 +22,10 @@ config MSCC_JR2_SWITCH
        select PHYLIB
        help
          This driver supports the Jaguar2 network switch device.
+
+config MSCC_SERVALT_SWITCH
+       bool "Servalt switch driver"
+       depends on DM_ETH && ARCH_MSCC
+       select PHYLIB
+       help
+         This driver supports the Servalt network switch device.
index 0a1b8632a9f6a64a307c3662a7c3adbe5fa7778a..bffd8ec77b0f6a11f00c12db1df91ac9b3f6be24 100644 (file)
@@ -2,3 +2,4 @@
 obj-$(CONFIG_MSCC_OCELOT_SWITCH) += ocelot_switch.o mscc_miim.o mscc_xfer.o mscc_mac_table.o
 obj-$(CONFIG_MSCC_LUTON_SWITCH) += luton_switch.o mscc_miim.o mscc_xfer.o mscc_mac_table.o
 obj-$(CONFIG_MSCC_JR2_SWITCH) += jr2_switch.o mscc_xfer.o
+obj-$(CONFIG_MSCC_SERVALT_SWITCH) += servalt_switch.o mscc_xfer.o
diff --git a/drivers/net/mscc_eswitch/servalt_switch.c b/drivers/net/mscc_eswitch/servalt_switch.c
new file mode 100644 (file)
index 0000000..995c623
--- /dev/null
@@ -0,0 +1,622 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2019 Microsemi Corporation
+ */
+
+#include <common.h>
+#include <config.h>
+#include <dm.h>
+#include <dm/of_access.h>
+#include <dm/of_addr.h>
+#include <fdt_support.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <miiphy.h>
+#include <net.h>
+#include <wait_bit.h>
+
+#include "mscc_xfer.h"
+
+#define GCB_MIIM_MII_STATUS            0x0
+#define                GCB_MIIM_STAT_BUSY              BIT(3)
+#define GCB_MIIM_MII_CMD               0x8
+#define                GCB_MIIM_MII_CMD_OPR_WRITE      BIT(1)
+#define                GCB_MIIM_MII_CMD_OPR_READ       BIT(2)
+#define                GCB_MIIM_MII_CMD_WRDATA(x)      ((x) << 4)
+#define                GCB_MIIM_MII_CMD_REGAD(x)       ((x) << 20)
+#define                GCB_MIIM_MII_CMD_PHYAD(x)       ((x) << 25)
+#define                GCB_MIIM_MII_CMD_VLD            BIT(31)
+#define GCB_MIIM_DATA                  0xC
+#define                GCB_MIIM_DATA_ERROR             (0x3 << 16)
+
+#define PHY_CFG                                0x0
+#define PHY_CFG_ENA                            0x3
+#define PHY_CFG_COMMON_RST                     BIT(2)
+#define PHY_CFG_RST                            (0x3 << 3)
+#define PHY_STAT                       0x4
+#define PHY_STAT_SUPERVISOR_COMPLETE           BIT(0)
+
+#define ANA_AC_RAM_CTRL_RAM_INIT               0x14fdc
+#define ANA_AC_STAT_GLOBAL_CFG_PORT_RESET      0x15474
+
+#define ANA_CL_PORT_VLAN_CFG(x)                        (0xa018 + 0xc8 * (x))
+#define                ANA_CL_PORT_VLAN_CFG_AWARE_ENA                  BIT(19)
+#define                ANA_CL_PORT_VLAN_CFG_POP_CNT(x)                 ((x) << 17)
+
+#define ANA_L2_COMMON_FWD_CFG                  0x18498
+#define                ANA_L2_COMMON_FWD_CFG_CPU_DMAC_COPY_ENA BIT(6)
+
+#define ASM_CFG_STAT_CFG                       0xb08
+#define ASM_CFG_PORT(x)                                (0xb74 + 0x4 * (x))
+#define                ASM_CFG_PORT_NO_PREAMBLE_ENA            BIT(8)
+#define                ASM_CFG_PORT_INJ_FORMAT_CFG(x)          ((x) << 1)
+#define ASM_RAM_CTRL_RAM_INIT                  0xbfc
+
+#define DEV_DEV_CFG_DEV_RST_CTRL       0x0
+#define                DEV_DEV_CFG_DEV_RST_CTRL_SPEED_SEL(x)   ((x) << 20)
+#define DEV_MAC_CFG_MAC_ENA            0x24
+#define                DEV_MAC_CFG_MAC_ENA_RX_ENA              BIT(4)
+#define                DEV_MAC_CFG_MAC_ENA_TX_ENA              BIT(0)
+#define DEV_MAC_CFG_MAC_IFG            0x3c
+#define                DEV_MAC_CFG_MAC_IFG_TX_IFG(x)           ((x) << 8)
+#define                DEV_MAC_CFG_MAC_IFG_RX_IFG2(x)          ((x) << 4)
+#define                DEV_MAC_CFG_MAC_IFG_RX_IFG1(x)          (x)
+#define DEV_PCS1G_CFG_PCS1G_CFG                0x48
+#define                DEV_PCS1G_CFG_PCS1G_CFG_PCS_ENA         BIT(0)
+#define DEV_PCS1G_CFG_PCS1G_MODE       0x4c
+#define DEV_PCS1G_CFG_PCS1G_SD         0x50
+#define DEV_PCS1G_CFG_PCS1G_ANEG       0x54
+#define                DEV_PCS1G_CFG_PCS1G_ANEG_ADV_ABILITY(x) ((x) << 16)
+
+#define LRN_COMMON_ACCESS_CTRL                 0x0
+#define                LRN_COMMON_ACCESS_CTRL_MAC_TABLE_ACCESS_SHOT    BIT(0)
+#define LRN_COMMON_MAC_ACCESS_CFG0             0x4
+#define LRN_COMMON_MAC_ACCESS_CFG1             0x8
+#define LRN_COMMON_MAC_ACCESS_CFG2             0xc
+#define                LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_ADDR(x)    (x)
+#define                LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_TYPE(x)    ((x) << 12)
+#define                LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_VLD        BIT(15)
+#define                LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_LOCKED     BIT(16)
+#define                LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_COPY   BIT(23)
+#define                LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_QU(x)  ((x) << 24)
+
+#define QFWD_SYSTEM_SWITCH_PORT_MODE(x)                (0x4400 + 0x4 * (x))
+#define                QFWD_SYSTEM_SWITCH_PORT_MODE_PORT_ENA           BIT(17)
+
+#define QS_XTR_GRP_CFG(x)              (4 * (x))
+#define QS_INJ_GRP_CFG(x)              (0x24 + (x) * 4)
+
+#define QSYS_SYSTEM_RESET_CFG                  0x1048
+#define QSYS_CALCFG_CAL_AUTO                   0x1134
+#define QSYS_CALCFG_CAL_CTRL                   0x113c
+#define                QSYS_CALCFG_CAL_CTRL_CAL_MODE(x)                ((x) << 11)
+#define QSYS_RAM_CTRL_RAM_INIT                 0x1140
+
+#define REW_RAM_CTRL_RAM_INIT                  0xFFF4
+
+#define MAC_VID                        0
+#define CPU_PORT               11
+#define IFH_LEN                        7
+#define ETH_ALEN               6
+#define PGID_BROADCAST         50
+#define PGID_UNICAST           51
+
+static const char * const regs_names[] = {
+       "port0", "port1",
+       "ana_ac", "ana_cl", "ana_l2", "asm", "lrn", "qfwd", "qs", "qsys", "rew",
+};
+
+#define REGS_NAMES_COUNT ARRAY_SIZE(regs_names) + 1
+#define MAX_PORT 2
+
+enum servalt_ctrl_regs {
+       ANA_AC = MAX_PORT,
+       ANA_CL,
+       ANA_L2,
+       ASM,
+       LRN,
+       QFWD,
+       QS,
+       QSYS,
+       REW,
+};
+
+#define SERVALT_MIIM_BUS_COUNT 2
+
+struct servalt_phy_port_t {
+       size_t phy_addr;
+       struct mii_dev *bus;
+};
+
+struct servalt_private {
+       void __iomem *regs[REGS_NAMES_COUNT];
+       struct mii_dev *bus[SERVALT_MIIM_BUS_COUNT];
+       struct servalt_phy_port_t ports[MAX_PORT];
+};
+
+struct mscc_miim_dev {
+       void __iomem *regs;
+       phys_addr_t miim_base;
+       unsigned long miim_size;
+       struct mii_dev *bus;
+};
+
+static const unsigned long servalt_regs_qs[] = {
+       [MSCC_QS_XTR_RD] = 0x8,
+       [MSCC_QS_XTR_FLUSH] = 0x18,
+       [MSCC_QS_XTR_DATA_PRESENT] = 0x1c,
+       [MSCC_QS_INJ_WR] = 0x2c,
+       [MSCC_QS_INJ_CTRL] = 0x34,
+};
+
+static struct mscc_miim_dev miim[SERVALT_MIIM_BUS_COUNT];
+static int miim_count = -1;
+
+static int mscc_miim_wait_ready(struct mscc_miim_dev *miim)
+{
+       return wait_for_bit_le32(miim->regs + GCB_MIIM_MII_STATUS,
+                                GCB_MIIM_STAT_BUSY, false, 250, false);
+}
+
+static int mscc_miim_read(struct mii_dev *bus, int addr, int devad, int reg)
+{
+       struct mscc_miim_dev *miim = (struct mscc_miim_dev *)bus->priv;
+       u32 val;
+       int ret;
+
+       ret = mscc_miim_wait_ready(miim);
+       if (ret)
+               goto out;
+
+       writel(GCB_MIIM_MII_CMD_VLD | GCB_MIIM_MII_CMD_PHYAD(addr) |
+              GCB_MIIM_MII_CMD_REGAD(reg) | GCB_MIIM_MII_CMD_OPR_READ,
+              miim->regs + GCB_MIIM_MII_CMD);
+
+       ret = mscc_miim_wait_ready(miim);
+       if (ret)
+               goto out;
+
+       val = readl(miim->regs + GCB_MIIM_DATA);
+       if (val & GCB_MIIM_DATA_ERROR) {
+               ret = -EIO;
+               goto out;
+       }
+
+       ret = val & 0xFFFF;
+out:
+       return ret;
+}
+
+static int mscc_miim_write(struct mii_dev *bus, int addr, int devad, int reg,
+                          u16 val)
+{
+       struct mscc_miim_dev *miim = (struct mscc_miim_dev *)bus->priv;
+       int ret;
+
+       ret = mscc_miim_wait_ready(miim);
+       if (ret < 0)
+               goto out;
+
+       writel(GCB_MIIM_MII_CMD_VLD | GCB_MIIM_MII_CMD_PHYAD(addr) |
+              GCB_MIIM_MII_CMD_REGAD(reg) | GCB_MIIM_MII_CMD_WRDATA(val) |
+              GCB_MIIM_MII_CMD_OPR_WRITE, miim->regs + GCB_MIIM_MII_CMD);
+
+out:
+       return ret;
+}
+
+static struct mii_dev *servalt_mdiobus_init(phys_addr_t miim_base,
+                                           unsigned long miim_size)
+{
+       struct mii_dev *bus;
+
+       bus = mdio_alloc();
+       if (!bus)
+               return NULL;
+
+       ++miim_count;
+       sprintf(bus->name, "miim-bus%d", miim_count);
+
+       miim[miim_count].regs = ioremap(miim_base, miim_size);
+       miim[miim_count].miim_base = miim_base;
+       miim[miim_count].miim_size = miim_size;
+       bus->priv = &miim[miim_count];
+       bus->read = mscc_miim_read;
+       bus->write = mscc_miim_write;
+
+       if (mdio_register(bus))
+               return NULL;
+
+       miim[miim_count].bus = bus;
+       return bus;
+}
+
+static void mscc_phy_reset(void)
+{
+       writel(0, BASE_DEVCPU_GCB + GCB_PHY_CFG + PHY_CFG);
+       writel(PHY_CFG_RST | PHY_CFG_COMMON_RST
+              | PHY_CFG_ENA, BASE_DEVCPU_GCB + GCB_PHY_CFG + PHY_CFG);
+       if (wait_for_bit_le32((const void *)(BASE_DEVCPU_GCB + GCB_PHY_CFG) +
+                             PHY_STAT, PHY_STAT_SUPERVISOR_COMPLETE,
+                             true, 2000, false)) {
+               pr_err("Timeout in phy reset\n");
+       }
+}
+
+static void servalt_cpu_capture_setup(struct servalt_private *priv)
+{
+       /* ASM: No preamble and IFH prefix on CPU injected frames */
+       writel(ASM_CFG_PORT_NO_PREAMBLE_ENA |
+              ASM_CFG_PORT_INJ_FORMAT_CFG(1),
+              priv->regs[ASM] + ASM_CFG_PORT(CPU_PORT));
+
+       /* Set Manual injection via DEVCPU_QS registers for CPU queue 0 */
+       writel(0x5, priv->regs[QS] + QS_INJ_GRP_CFG(0));
+
+       /* Set Manual extraction via DEVCPU_QS registers for CPU queue 0 */
+       writel(0x7, priv->regs[QS] + QS_XTR_GRP_CFG(0));
+
+       /* Enable CPU port for any frame transfer */
+       setbits_le32(priv->regs[QFWD] + QFWD_SYSTEM_SWITCH_PORT_MODE(CPU_PORT),
+                    QFWD_SYSTEM_SWITCH_PORT_MODE_PORT_ENA);
+
+       /* Send a copy to CPU when found as forwarding entry */
+       setbits_le32(priv->regs[ANA_L2] + ANA_L2_COMMON_FWD_CFG,
+                    ANA_L2_COMMON_FWD_CFG_CPU_DMAC_COPY_ENA);
+}
+
+static void servalt_port_init(struct servalt_private *priv, int port)
+{
+       void __iomem *regs = priv->regs[port];
+
+       /* Enable PCS */
+       writel(DEV_PCS1G_CFG_PCS1G_CFG_PCS_ENA,
+              regs + DEV_PCS1G_CFG_PCS1G_CFG);
+
+       /* Disable Signal Detect */
+       writel(0, regs + DEV_PCS1G_CFG_PCS1G_SD);
+
+       /* Enable MAC RX and TX */
+       writel(DEV_MAC_CFG_MAC_ENA_RX_ENA |
+              DEV_MAC_CFG_MAC_ENA_TX_ENA,
+              regs + DEV_MAC_CFG_MAC_ENA);
+
+       /* Clear sgmii_mode_ena */
+       writel(0, regs + DEV_PCS1G_CFG_PCS1G_MODE);
+
+       /*
+        * Clear sw_resolve_ena(bit 0) and set adv_ability to
+        * something meaningful just in case
+        */
+       writel(DEV_PCS1G_CFG_PCS1G_ANEG_ADV_ABILITY(0x20),
+              regs + DEV_PCS1G_CFG_PCS1G_ANEG);
+
+       /* Set MAC IFG Gaps */
+       writel(DEV_MAC_CFG_MAC_IFG_TX_IFG(4) |
+              DEV_MAC_CFG_MAC_IFG_RX_IFG1(5) |
+              DEV_MAC_CFG_MAC_IFG_RX_IFG2(1),
+              regs + DEV_MAC_CFG_MAC_IFG);
+
+       /* Set link speed and release all resets */
+       writel(DEV_DEV_CFG_DEV_RST_CTRL_SPEED_SEL(2),
+              regs + DEV_DEV_CFG_DEV_RST_CTRL);
+
+       /* Make VLAN aware for CPU traffic */
+       writel(ANA_CL_PORT_VLAN_CFG_AWARE_ENA |
+              ANA_CL_PORT_VLAN_CFG_POP_CNT(1) |
+              MAC_VID,
+              priv->regs[ANA_CL] + ANA_CL_PORT_VLAN_CFG(port));
+
+       /* Enable CPU port for any frame transfer */
+       setbits_le32(priv->regs[QFWD] + QFWD_SYSTEM_SWITCH_PORT_MODE(port),
+                    QFWD_SYSTEM_SWITCH_PORT_MODE_PORT_ENA);
+}
+
+static int ram_init(u32 val, void __iomem *addr)
+{
+       writel(val, addr);
+
+       if (wait_for_bit_le32(addr, BIT(1), false, 2000, false)) {
+               printf("Timeout in memory reset, reg = 0x%08x\n", val);
+               return 1;
+       }
+
+       return 0;
+}
+
+static int servalt_switch_init(struct servalt_private *priv)
+{
+       /* Initialize memories */
+       ram_init(0x3, priv->regs[QSYS] + QSYS_RAM_CTRL_RAM_INIT);
+       ram_init(0x3, priv->regs[ASM] + ASM_RAM_CTRL_RAM_INIT);
+       ram_init(0x3, priv->regs[ANA_AC] + ANA_AC_RAM_CTRL_RAM_INIT);
+       ram_init(0x3, priv->regs[REW] + REW_RAM_CTRL_RAM_INIT);
+
+       /* Reset counters */
+       writel(0x1, priv->regs[ANA_AC] + ANA_AC_STAT_GLOBAL_CFG_PORT_RESET);
+       writel(0x1, priv->regs[ASM] + ASM_CFG_STAT_CFG);
+
+       /* Enable switch-core and queue system */
+       writel(0x1, priv->regs[QSYS] + QSYS_SYSTEM_RESET_CFG);
+
+       return 0;
+}
+
+static void servalt_switch_config(struct servalt_private *priv)
+{
+       writel(0x55555555, priv->regs[QSYS] + QSYS_CALCFG_CAL_AUTO);
+
+       writel(readl(priv->regs[QSYS] + QSYS_CALCFG_CAL_CTRL) |
+              QSYS_CALCFG_CAL_CTRL_CAL_MODE(8),
+              priv->regs[QSYS] + QSYS_CALCFG_CAL_CTRL);
+}
+
+static int servalt_initialize(struct servalt_private *priv)
+{
+       int ret, i;
+
+       /* Initialize switch memories, enable core */
+       ret = servalt_switch_init(priv);
+       if (ret)
+               return ret;
+
+       servalt_switch_config(priv);
+
+       for (i = 0; i < MAX_PORT; i++)
+               servalt_port_init(priv, i);
+
+       servalt_cpu_capture_setup(priv);
+
+       return 0;
+}
+
+static inline
+int servalt_vlant_wait_for_completion(struct servalt_private *priv)
+{
+       if (wait_for_bit_le32(priv->regs[LRN] + LRN_COMMON_ACCESS_CTRL,
+                             LRN_COMMON_ACCESS_CTRL_MAC_TABLE_ACCESS_SHOT,
+                             false, 2000, false))
+               return -ETIMEDOUT;
+
+       return 0;
+}
+
+static int servalt_mac_table_add(struct servalt_private *priv,
+                                const unsigned char mac[ETH_ALEN], int pgid)
+{
+       u32 macl = 0, mach = 0;
+
+       /*
+        * Set the MAC address to handle and the vlan associated in a format
+        * understood by the hardware.
+        */
+       mach |= MAC_VID << 16;
+       mach |= ((u32)mac[0]) << 8;
+       mach |= ((u32)mac[1]) << 0;
+       macl |= ((u32)mac[2]) << 24;
+       macl |= ((u32)mac[3]) << 16;
+       macl |= ((u32)mac[4]) << 8;
+       macl |= ((u32)mac[5]) << 0;
+
+       writel(mach, priv->regs[LRN] + LRN_COMMON_MAC_ACCESS_CFG0);
+       writel(macl, priv->regs[LRN] + LRN_COMMON_MAC_ACCESS_CFG1);
+
+       writel(LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_ADDR(pgid) |
+              LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_TYPE(0x3) |
+              LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_COPY |
+              LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_QU(0) |
+              LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_VLD |
+              LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_LOCKED,
+              priv->regs[LRN] + LRN_COMMON_MAC_ACCESS_CFG2);
+
+       writel(LRN_COMMON_ACCESS_CTRL_MAC_TABLE_ACCESS_SHOT,
+              priv->regs[LRN] + LRN_COMMON_ACCESS_CTRL);
+
+       return servalt_vlant_wait_for_completion(priv);
+}
+
+static int servalt_write_hwaddr(struct udevice *dev)
+{
+       struct servalt_private *priv = dev_get_priv(dev);
+       struct eth_pdata *pdata = dev_get_platdata(dev);
+
+       return servalt_mac_table_add(priv, pdata->enetaddr, PGID_UNICAST);
+}
+
+static int servalt_start(struct udevice *dev)
+{
+       struct servalt_private *priv = dev_get_priv(dev);
+       struct eth_pdata *pdata = dev_get_platdata(dev);
+       const unsigned char mac[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff,
+               0xff };
+       int ret;
+
+       ret = servalt_initialize(priv);
+       if (ret)
+               return ret;
+
+       /* Set MAC address tables entries for CPU redirection */
+       ret = servalt_mac_table_add(priv, mac, PGID_BROADCAST);
+       if (ret)
+               return ret;
+
+       ret = servalt_mac_table_add(priv, pdata->enetaddr, PGID_UNICAST);
+       if (ret)
+               return ret;
+
+       return 0;
+}
+
+static void servalt_stop(struct udevice *dev)
+{
+}
+
+static int servalt_send(struct udevice *dev, void *packet, int length)
+{
+       struct servalt_private *priv = dev_get_priv(dev);
+       u32 ifh[IFH_LEN];
+       u32 *buf = packet;
+
+       memset(ifh, '\0', IFH_LEN * 4);
+
+       /* Set DST PORT_MASK */
+       ifh[0] = htonl(0);
+       ifh[1] = htonl(0x1FFFFF);
+       ifh[2] = htonl(~0);
+       /* Set DST_MODE to INJECT and UPDATE_FCS */
+       ifh[5] = htonl(0x4c0);
+
+       return mscc_send(priv->regs[QS], servalt_regs_qs,
+                        ifh, IFH_LEN, buf, length);
+}
+
+static int servalt_recv(struct udevice *dev, int flags, uchar **packetp)
+{
+       struct servalt_private *priv = dev_get_priv(dev);
+       u32 *rxbuf = (u32 *)net_rx_packets[0];
+       int byte_cnt = 0;
+
+       byte_cnt = mscc_recv(priv->regs[QS], servalt_regs_qs, rxbuf, IFH_LEN,
+                            false);
+
+       *packetp = net_rx_packets[0];
+
+       return byte_cnt;
+}
+
+static struct mii_dev *get_mdiobus(phys_addr_t base, unsigned long size)
+{
+       int i = 0;
+
+       for (i = 0; i < SERVALT_MIIM_BUS_COUNT; ++i)
+               if (miim[i].miim_base == base && miim[i].miim_size == size)
+                       return miim[i].bus;
+
+       return NULL;
+}
+
+static void add_port_entry(struct servalt_private *priv, size_t index,
+                          size_t phy_addr, struct mii_dev *bus)
+{
+       priv->ports[index].phy_addr = phy_addr;
+       priv->ports[index].bus = bus;
+}
+
+static int servalt_probe(struct udevice *dev)
+{
+       struct servalt_private *priv = dev_get_priv(dev);
+       int i;
+       struct resource res;
+       fdt32_t faddr;
+       phys_addr_t addr_base;
+       unsigned long addr_size;
+       ofnode eth_node, node, mdio_node;
+       size_t phy_addr;
+       struct mii_dev *bus;
+       struct ofnode_phandle_args phandle;
+
+       if (!priv)
+               return -EINVAL;
+
+       /* Get registers and map them to the private structure */
+       for (i = 0; i < ARRAY_SIZE(regs_names); i++) {
+               priv->regs[i] = dev_remap_addr_name(dev, regs_names[i]);
+               if (!priv->regs[i]) {
+                       debug
+                           ("Error can't get regs base addresses for %s\n",
+                            regs_names[i]);
+                       return -ENOMEM;
+               }
+       }
+
+       /* Initialize miim buses */
+       memset(&miim, 0x0, sizeof(struct mscc_miim_dev) *
+              SERVALT_MIIM_BUS_COUNT);
+
+       /* iterate all the ports and find out on which bus they are */
+       i = 0;
+       eth_node = dev_read_first_subnode(dev);
+       for (node = ofnode_first_subnode(eth_node);
+            ofnode_valid(node);
+            node = ofnode_next_subnode(node)) {
+               if (ofnode_read_resource(node, 0, &res))
+                       return -ENOMEM;
+               i = res.start;
+
+               ofnode_parse_phandle_with_args(node, "phy-handle", NULL, 0, 0,
+                                              &phandle);
+
+               /* Get phy address on mdio bus */
+               if (ofnode_read_resource(phandle.node, 0, &res))
+                       return -ENOMEM;
+               phy_addr = res.start;
+
+               /* Get mdio node */
+               mdio_node = ofnode_get_parent(phandle.node);
+
+               if (ofnode_read_resource(mdio_node, 0, &res))
+                       return -ENOMEM;
+               faddr = cpu_to_fdt32(res.start);
+
+               addr_base = ofnode_translate_address(mdio_node, &faddr);
+               addr_size = res.end - res.start;
+
+               /* If the bus is new then create a new bus */
+               if (!get_mdiobus(addr_base, addr_size))
+                       priv->bus[miim_count] =
+                               servalt_mdiobus_init(addr_base, addr_size);
+
+               /* Connect mdio bus with the port */
+               bus = get_mdiobus(addr_base, addr_size);
+               add_port_entry(priv, i, phy_addr, bus);
+       }
+
+       mscc_phy_reset();
+
+       for (i = 0; i < MAX_PORT; i++) {
+               if (!priv->ports[i].bus)
+                       continue;
+
+               phy_connect(priv->ports[i].bus, priv->ports[i].phy_addr, dev,
+                           PHY_INTERFACE_MODE_NONE);
+       }
+
+       return 0;
+}
+
+static int servalt_remove(struct udevice *dev)
+{
+       struct servalt_private *priv = dev_get_priv(dev);
+       int i;
+
+       for (i = 0; i < SERVALT_MIIM_BUS_COUNT; i++) {
+               mdio_unregister(priv->bus[i]);
+               mdio_free(priv->bus[i]);
+       }
+
+       return 0;
+}
+
+static const struct eth_ops servalt_ops = {
+       .start        = servalt_start,
+       .stop         = servalt_stop,
+       .send         = servalt_send,
+       .recv         = servalt_recv,
+       .write_hwaddr = servalt_write_hwaddr,
+};
+
+static const struct udevice_id mscc_servalt_ids[] = {
+       {.compatible = "mscc,vsc7437-switch" },
+       { /* Sentinel */ }
+};
+
+U_BOOT_DRIVER(servalt) = {
+       .name                           = "servalt-switch",
+       .id                             = UCLASS_ETH,
+       .of_match                       = mscc_servalt_ids,
+       .probe                          = servalt_probe,
+       .remove                         = servalt_remove,
+       .ops                            = &servalt_ops,
+       .priv_auto_alloc_size           = sizeof(struct servalt_private),
+       .platdata_auto_alloc_size       = sizeof(struct eth_pdata),
+};