Merge branch 'u-boot/master' into 'u-boot-arm/master'

[people/ms/u-boot.git] / drivers / net / mvneta.c

/*
 * Driver for Marvell NETA network card for Armada XP and Armada 370 SoCs.
 *
 * U-Boot version:
 * Copyright (C) 2014 Stefan Roese <sr@denx.de>
 *
 * Based on the Linux version which is:
 * Copyright (C) 2012 Marvell
 *
 * Rami Rosen <rosenr@marvell.com>
 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
 *
 * SPDX-License-Identifier:     GPL-2.0
 */

#include <common.h>
#include <net.h>
#include <netdev.h>
#include <config.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/errno.h>
#include <phy.h>
#include <miiphy.h>
#include <watchdog.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>
#include <linux/compat.h>
#include <linux/mbus.h>

#if !defined(CONFIG_PHYLIB)
# error Marvell mvneta requires PHYLIB
#endif

/* Some linux -> U-Boot compatibility stuff */
#define netdev_err(dev, fmt, args...)           \
        printf(fmt, ##args)
#define netdev_warn(dev, fmt, args...)          \
        printf(fmt, ##args)
#define netdev_info(dev, fmt, args...)          \
        printf(fmt, ##args)

#define CONFIG_NR_CPUS          1
#define BIT(nr)                 (1UL << (nr))
#define ETH_HLEN                14      /* Total octets in header */

/* 2(HW hdr) 14(MAC hdr) 4(CRC) 32(extra for cache prefetch) */
#define WRAP                    (2 + ETH_HLEN + 4 + 32)
#define MTU                     1500
#define RX_BUFFER_SIZE          (ALIGN(MTU + WRAP, ARCH_DMA_MINALIGN))

#define MVNETA_SMI_TIMEOUT                      10000

/* Registers */
#define MVNETA_RXQ_CONFIG_REG(q)                (0x1400 + ((q) << 2))
#define      MVNETA_RXQ_HW_BUF_ALLOC            BIT(1)
#define      MVNETA_RXQ_PKT_OFFSET_ALL_MASK     (0xf    << 8)
#define      MVNETA_RXQ_PKT_OFFSET_MASK(offs)   ((offs) << 8)
#define MVNETA_RXQ_THRESHOLD_REG(q)             (0x14c0 + ((q) << 2))
#define      MVNETA_RXQ_NON_OCCUPIED(v)         ((v) << 16)
#define MVNETA_RXQ_BASE_ADDR_REG(q)             (0x1480 + ((q) << 2))
#define MVNETA_RXQ_SIZE_REG(q)                  (0x14a0 + ((q) << 2))
#define      MVNETA_RXQ_BUF_SIZE_SHIFT          19
#define      MVNETA_RXQ_BUF_SIZE_MASK           (0x1fff << 19)
#define MVNETA_RXQ_STATUS_REG(q)                (0x14e0 + ((q) << 2))
#define      MVNETA_RXQ_OCCUPIED_ALL_MASK       0x3fff
#define MVNETA_RXQ_STATUS_UPDATE_REG(q)         (0x1500 + ((q) << 2))
#define      MVNETA_RXQ_ADD_NON_OCCUPIED_SHIFT  16
#define      MVNETA_RXQ_ADD_NON_OCCUPIED_MAX    255
#define MVNETA_PORT_RX_RESET                    0x1cc0
#define      MVNETA_PORT_RX_DMA_RESET           BIT(0)
#define MVNETA_PHY_ADDR                         0x2000
#define      MVNETA_PHY_ADDR_MASK               0x1f
#define MVNETA_SMI                              0x2004
#define      MVNETA_PHY_REG_MASK                0x1f
/* SMI register fields */
#define     MVNETA_SMI_DATA_OFFS                0       /* Data */
#define     MVNETA_SMI_DATA_MASK                (0xffff << MVNETA_SMI_DATA_OFFS)
#define     MVNETA_SMI_DEV_ADDR_OFFS            16      /* PHY device address */
#define     MVNETA_SMI_REG_ADDR_OFFS            21      /* PHY device reg addr*/
#define     MVNETA_SMI_OPCODE_OFFS              26      /* Write/Read opcode */
#define     MVNETA_SMI_OPCODE_READ              (1 << MVNETA_SMI_OPCODE_OFFS)
#define     MVNETA_SMI_READ_VALID               (1 << 27)       /* Read Valid */
#define     MVNETA_SMI_BUSY                     (1 << 28)       /* Busy */
#define MVNETA_MBUS_RETRY                       0x2010
#define MVNETA_UNIT_INTR_CAUSE                  0x2080
#define MVNETA_UNIT_CONTROL                     0x20B0
#define      MVNETA_PHY_POLLING_ENABLE          BIT(1)
#define MVNETA_WIN_BASE(w)                      (0x2200 + ((w) << 3))
#define MVNETA_WIN_SIZE(w)                      (0x2204 + ((w) << 3))
#define MVNETA_WIN_REMAP(w)                     (0x2280 + ((w) << 2))
#define MVNETA_BASE_ADDR_ENABLE                 0x2290
#define MVNETA_PORT_CONFIG                      0x2400
#define      MVNETA_UNI_PROMISC_MODE            BIT(0)
#define      MVNETA_DEF_RXQ(q)                  ((q) << 1)
#define      MVNETA_DEF_RXQ_ARP(q)              ((q) << 4)
#define      MVNETA_TX_UNSET_ERR_SUM            BIT(12)
#define      MVNETA_DEF_RXQ_TCP(q)              ((q) << 16)
#define      MVNETA_DEF_RXQ_UDP(q)              ((q) << 19)
#define      MVNETA_DEF_RXQ_BPDU(q)             ((q) << 22)
#define      MVNETA_RX_CSUM_WITH_PSEUDO_HDR     BIT(25)
#define      MVNETA_PORT_CONFIG_DEFL_VALUE(q)   (MVNETA_DEF_RXQ(q)       | \
                                                 MVNETA_DEF_RXQ_ARP(q)   | \
                                                 MVNETA_DEF_RXQ_TCP(q)   | \
                                                 MVNETA_DEF_RXQ_UDP(q)   | \
                                                 MVNETA_DEF_RXQ_BPDU(q)  | \
                                                 MVNETA_TX_UNSET_ERR_SUM | \
                                                 MVNETA_RX_CSUM_WITH_PSEUDO_HDR)
#define MVNETA_PORT_CONFIG_EXTEND                0x2404
#define MVNETA_MAC_ADDR_LOW                      0x2414
#define MVNETA_MAC_ADDR_HIGH                     0x2418
#define MVNETA_SDMA_CONFIG                       0x241c
#define      MVNETA_SDMA_BRST_SIZE_16            4
#define      MVNETA_RX_BRST_SZ_MASK(burst)       ((burst) << 1)
#define      MVNETA_RX_NO_DATA_SWAP              BIT(4)
#define      MVNETA_TX_NO_DATA_SWAP              BIT(5)
#define      MVNETA_DESC_SWAP                    BIT(6)
#define      MVNETA_TX_BRST_SZ_MASK(burst)       ((burst) << 22)
#define MVNETA_PORT_STATUS                       0x2444
#define      MVNETA_TX_IN_PRGRS                  BIT(1)
#define      MVNETA_TX_FIFO_EMPTY                BIT(8)
#define MVNETA_RX_MIN_FRAME_SIZE                 0x247c
#define MVNETA_SERDES_CFG                        0x24A0
#define      MVNETA_SGMII_SERDES_PROTO           0x0cc7
#define      MVNETA_QSGMII_SERDES_PROTO          0x0667
#define MVNETA_TYPE_PRIO                         0x24bc
#define      MVNETA_FORCE_UNI                    BIT(21)
#define MVNETA_TXQ_CMD_1                         0x24e4
#define MVNETA_TXQ_CMD                           0x2448
#define      MVNETA_TXQ_DISABLE_SHIFT            8
#define      MVNETA_TXQ_ENABLE_MASK              0x000000ff
#define MVNETA_ACC_MODE                          0x2500
#define MVNETA_CPU_MAP(cpu)                      (0x2540 + ((cpu) << 2))
#define      MVNETA_CPU_RXQ_ACCESS_ALL_MASK      0x000000ff
#define      MVNETA_CPU_TXQ_ACCESS_ALL_MASK      0x0000ff00
#define MVNETA_RXQ_TIME_COAL_REG(q)              (0x2580 + ((q) << 2))

/* Exception Interrupt Port/Queue Cause register */

#define MVNETA_INTR_NEW_CAUSE                    0x25a0
#define MVNETA_INTR_NEW_MASK                     0x25a4

/* bits  0..7  = TXQ SENT, one bit per queue.
 * bits  8..15 = RXQ OCCUP, one bit per queue.
 * bits 16..23 = RXQ FREE, one bit per queue.
 * bit  29 = OLD_REG_SUM, see old reg ?
 * bit  30 = TX_ERR_SUM, one bit for 4 ports
 * bit  31 = MISC_SUM,   one bit for 4 ports
 */
#define      MVNETA_TX_INTR_MASK(nr_txqs)        (((1 << nr_txqs) - 1) << 0)
#define      MVNETA_TX_INTR_MASK_ALL             (0xff << 0)
#define      MVNETA_RX_INTR_MASK(nr_rxqs)        (((1 << nr_rxqs) - 1) << 8)
#define      MVNETA_RX_INTR_MASK_ALL             (0xff << 8)

#define MVNETA_INTR_OLD_CAUSE                    0x25a8
#define MVNETA_INTR_OLD_MASK                     0x25ac

/* Data Path Port/Queue Cause Register */
#define MVNETA_INTR_MISC_CAUSE                   0x25b0
#define MVNETA_INTR_MISC_MASK                    0x25b4
#define MVNETA_INTR_ENABLE                       0x25b8

#define MVNETA_RXQ_CMD                           0x2680
#define      MVNETA_RXQ_DISABLE_SHIFT            8
#define      MVNETA_RXQ_ENABLE_MASK              0x000000ff
#define MVETH_TXQ_TOKEN_COUNT_REG(q)             (0x2700 + ((q) << 4))
#define MVETH_TXQ_TOKEN_CFG_REG(q)               (0x2704 + ((q) << 4))
#define MVNETA_GMAC_CTRL_0                       0x2c00
#define      MVNETA_GMAC_MAX_RX_SIZE_SHIFT       2
#define      MVNETA_GMAC_MAX_RX_SIZE_MASK        0x7ffc
#define      MVNETA_GMAC0_PORT_ENABLE            BIT(0)
#define MVNETA_GMAC_CTRL_2                       0x2c08
#define      MVNETA_GMAC2_PCS_ENABLE             BIT(3)
#define      MVNETA_GMAC2_PORT_RGMII             BIT(4)
#define      MVNETA_GMAC2_PORT_RESET             BIT(6)
#define MVNETA_GMAC_STATUS                       0x2c10
#define      MVNETA_GMAC_LINK_UP                 BIT(0)
#define      MVNETA_GMAC_SPEED_1000              BIT(1)
#define      MVNETA_GMAC_SPEED_100               BIT(2)
#define      MVNETA_GMAC_FULL_DUPLEX             BIT(3)
#define      MVNETA_GMAC_RX_FLOW_CTRL_ENABLE     BIT(4)
#define      MVNETA_GMAC_TX_FLOW_CTRL_ENABLE     BIT(5)
#define      MVNETA_GMAC_RX_FLOW_CTRL_ACTIVE     BIT(6)
#define      MVNETA_GMAC_TX_FLOW_CTRL_ACTIVE     BIT(7)
#define MVNETA_GMAC_AUTONEG_CONFIG               0x2c0c
#define      MVNETA_GMAC_FORCE_LINK_DOWN         BIT(0)
#define      MVNETA_GMAC_FORCE_LINK_PASS         BIT(1)
#define      MVNETA_GMAC_CONFIG_MII_SPEED        BIT(5)
#define      MVNETA_GMAC_CONFIG_GMII_SPEED       BIT(6)
#define      MVNETA_GMAC_AN_SPEED_EN             BIT(7)
#define      MVNETA_GMAC_CONFIG_FULL_DUPLEX      BIT(12)
#define      MVNETA_GMAC_AN_DUPLEX_EN            BIT(13)
#define MVNETA_MIB_COUNTERS_BASE                 0x3080
#define      MVNETA_MIB_LATE_COLLISION           0x7c
#define MVNETA_DA_FILT_SPEC_MCAST                0x3400
#define MVNETA_DA_FILT_OTH_MCAST                 0x3500
#define MVNETA_DA_FILT_UCAST_BASE                0x3600
#define MVNETA_TXQ_BASE_ADDR_REG(q)              (0x3c00 + ((q) << 2))
#define MVNETA_TXQ_SIZE_REG(q)                   (0x3c20 + ((q) << 2))
#define      MVNETA_TXQ_SENT_THRESH_ALL_MASK     0x3fff0000
#define      MVNETA_TXQ_SENT_THRESH_MASK(coal)   ((coal) << 16)
#define MVNETA_TXQ_UPDATE_REG(q)                 (0x3c60 + ((q) << 2))
#define      MVNETA_TXQ_DEC_SENT_SHIFT           16
#define MVNETA_TXQ_STATUS_REG(q)                 (0x3c40 + ((q) << 2))
#define      MVNETA_TXQ_SENT_DESC_SHIFT          16
#define      MVNETA_TXQ_SENT_DESC_MASK           0x3fff0000
#define MVNETA_PORT_TX_RESET                     0x3cf0
#define      MVNETA_PORT_TX_DMA_RESET            BIT(0)
#define MVNETA_TX_MTU                            0x3e0c
#define MVNETA_TX_TOKEN_SIZE                     0x3e14
#define      MVNETA_TX_TOKEN_SIZE_MAX            0xffffffff
#define MVNETA_TXQ_TOKEN_SIZE_REG(q)             (0x3e40 + ((q) << 2))
#define      MVNETA_TXQ_TOKEN_SIZE_MAX           0x7fffffff

/* Descriptor ring Macros */
#define MVNETA_QUEUE_NEXT_DESC(q, index)        \
        (((index) < (q)->last_desc) ? ((index) + 1) : 0)

/* Various constants */

/* Coalescing */
#define MVNETA_TXDONE_COAL_PKTS         16
#define MVNETA_RX_COAL_PKTS             32
#define MVNETA_RX_COAL_USEC             100

/* The two bytes Marvell header. Either contains a special value used
 * by Marvell switches when a specific hardware mode is enabled (not
 * supported by this driver) or is filled automatically by zeroes on
 * the RX side. Those two bytes being at the front of the Ethernet
 * header, they allow to have the IP header aligned on a 4 bytes
 * boundary automatically: the hardware skips those two bytes on its
 * own.
 */
#define MVNETA_MH_SIZE                  2

#define MVNETA_VLAN_TAG_LEN             4

#define MVNETA_CPU_D_CACHE_LINE_SIZE    32
#define MVNETA_TX_CSUM_MAX_SIZE         9800
#define MVNETA_ACC_MODE_EXT             1

/* Timeout constants */
#define MVNETA_TX_DISABLE_TIMEOUT_MSEC  1000
#define MVNETA_RX_DISABLE_TIMEOUT_MSEC  1000
#define MVNETA_TX_FIFO_EMPTY_TIMEOUT    10000

#define MVNETA_TX_MTU_MAX               0x3ffff

/* Max number of Rx descriptors */
#define MVNETA_MAX_RXD 16

/* Max number of Tx descriptors */
#define MVNETA_MAX_TXD 16

/* descriptor aligned size */
#define MVNETA_DESC_ALIGNED_SIZE        32

struct mvneta_port {
        void __iomem *base;
        struct mvneta_rx_queue *rxqs;
        struct mvneta_tx_queue *txqs;

        u8 mcast_count[256];
        u16 tx_ring_size;
        u16 rx_ring_size;

        phy_interface_t phy_interface;
        unsigned int link;
        unsigned int duplex;
        unsigned int speed;

        int init;
        int phyaddr;
        struct phy_device *phydev;
        struct mii_dev *bus;
};

/* The mvneta_tx_desc and mvneta_rx_desc structures describe the
 * layout of the transmit and reception DMA descriptors, and their
 * layout is therefore defined by the hardware design
 */

#define MVNETA_TX_L3_OFF_SHIFT  0
#define MVNETA_TX_IP_HLEN_SHIFT 8
#define MVNETA_TX_L4_UDP        BIT(16)
#define MVNETA_TX_L3_IP6        BIT(17)
#define MVNETA_TXD_IP_CSUM      BIT(18)
#define MVNETA_TXD_Z_PAD        BIT(19)
#define MVNETA_TXD_L_DESC       BIT(20)
#define MVNETA_TXD_F_DESC       BIT(21)
#define MVNETA_TXD_FLZ_DESC     (MVNETA_TXD_Z_PAD  | \
                                 MVNETA_TXD_L_DESC | \
                                 MVNETA_TXD_F_DESC)
#define MVNETA_TX_L4_CSUM_FULL  BIT(30)
#define MVNETA_TX_L4_CSUM_NOT   BIT(31)

#define MVNETA_RXD_ERR_CRC              0x0
#define MVNETA_RXD_ERR_SUMMARY          BIT(16)
#define MVNETA_RXD_ERR_OVERRUN          BIT(17)
#define MVNETA_RXD_ERR_LEN              BIT(18)
#define MVNETA_RXD_ERR_RESOURCE         (BIT(17) | BIT(18))
#define MVNETA_RXD_ERR_CODE_MASK        (BIT(17) | BIT(18))
#define MVNETA_RXD_L3_IP4               BIT(25)
#define MVNETA_RXD_FIRST_LAST_DESC      (BIT(26) | BIT(27))
#define MVNETA_RXD_L4_CSUM_OK           BIT(30)

struct mvneta_tx_desc {
        u32  command;           /* Options used by HW for packet transmitting.*/
        u16  reserverd1;        /* csum_l4 (for future use)             */
        u16  data_size;         /* Data size of transmitted packet in bytes */
        u32  buf_phys_addr;     /* Physical addr of transmitted buffer  */
        u32  reserved2;         /* hw_cmd - (for future use, PMT)       */
        u32  reserved3[4];      /* Reserved - (for future use)          */
};

struct mvneta_rx_desc {
        u32  status;            /* Info about received packet           */
        u16  reserved1;         /* pnc_info - (for future use, PnC)     */
        u16  data_size;         /* Size of received packet in bytes     */

        u32  buf_phys_addr;     /* Physical address of the buffer       */
        u32  reserved2;         /* pnc_flow_id  (for future use, PnC)   */

        u32  buf_cookie;        /* cookie for access to RX buffer in rx path */
        u16  reserved3;         /* prefetch_cmd, for future use         */
        u16  reserved4;         /* csum_l4 - (for future use, PnC)      */

        u32  reserved5;         /* pnc_extra PnC (for future use, PnC)  */
        u32  reserved6;         /* hw_cmd (for future use, PnC and HWF) */
};

struct mvneta_tx_queue {
        /* Number of this TX queue, in the range 0-7 */
        u8 id;

        /* Number of TX DMA descriptors in the descriptor ring */
        int size;

        /* Index of last TX DMA descriptor that was inserted */
        int txq_put_index;

        /* Index of the TX DMA descriptor to be cleaned up */
        int txq_get_index;

        /* Virtual address of the TX DMA descriptors array */
        struct mvneta_tx_desc *descs;

        /* DMA address of the TX DMA descriptors array */
        dma_addr_t descs_phys;

        /* Index of the last TX DMA descriptor */
        int last_desc;

        /* Index of the next TX DMA descriptor to process */
        int next_desc_to_proc;
};

struct mvneta_rx_queue {
        /* rx queue number, in the range 0-7 */
        u8 id;

        /* num of rx descriptors in the rx descriptor ring */
        int size;

        /* Virtual address of the RX DMA descriptors array */
        struct mvneta_rx_desc *descs;

        /* DMA address of the RX DMA descriptors array */
        dma_addr_t descs_phys;

        /* Index of the last RX DMA descriptor */
        int last_desc;

        /* Index of the next RX DMA descriptor to process */
        int next_desc_to_proc;
};

/* U-Boot doesn't use the queues, so set the number to 1 */
static int rxq_number = 1;
static int txq_number = 1;
static int rxq_def;

struct buffer_location {
        struct mvneta_tx_desc *tx_descs;
        struct mvneta_rx_desc *rx_descs;
        u32 rx_buffers;
};

/*
 * All 4 interfaces use the same global buffer, since only one interface
 * can be enabled at once
 */
static struct buffer_location buffer_loc;

/*
 * Page table entries are set to 1MB, or multiples of 1MB
 * (not < 1MB). driver uses less bd's so use 1MB bdspace.
 */
#define BD_SPACE        (1 << 20)

/* Utility/helper methods */

/* Write helper method */
static void mvreg_write(struct mvneta_port *pp, u32 offset, u32 data)
{
        writel(data, pp->base + offset);
}

/* Read helper method */
static u32 mvreg_read(struct mvneta_port *pp, u32 offset)
{
        return readl(pp->base + offset);
}

/* Clear all MIB counters */
static void mvneta_mib_counters_clear(struct mvneta_port *pp)
{
        int i;

        /* Perform dummy reads from MIB counters */
        for (i = 0; i < MVNETA_MIB_LATE_COLLISION; i += 4)
                mvreg_read(pp, (MVNETA_MIB_COUNTERS_BASE + i));
}

/* Rx descriptors helper methods */

/* Checks whether the RX descriptor having this status is both the first
 * and the last descriptor for the RX packet. Each RX packet is currently
 * received through a single RX descriptor, so not having each RX
 * descriptor with its first and last bits set is an error
 */
static int mvneta_rxq_desc_is_first_last(u32 status)
{
        return (status & MVNETA_RXD_FIRST_LAST_DESC) ==
                MVNETA_RXD_FIRST_LAST_DESC;
}

/* Add number of descriptors ready to receive new packets */
static void mvneta_rxq_non_occup_desc_add(struct mvneta_port *pp,
                                          struct mvneta_rx_queue *rxq,
                                          int ndescs)
{
        /* Only MVNETA_RXQ_ADD_NON_OCCUPIED_MAX (255) descriptors can
         * be added at once
         */
        while (ndescs > MVNETA_RXQ_ADD_NON_OCCUPIED_MAX) {
                mvreg_write(pp, MVNETA_RXQ_STATUS_UPDATE_REG(rxq->id),
                            (MVNETA_RXQ_ADD_NON_OCCUPIED_MAX <<
                             MVNETA_RXQ_ADD_NON_OCCUPIED_SHIFT));
                ndescs -= MVNETA_RXQ_ADD_NON_OCCUPIED_MAX;
        }

        mvreg_write(pp, MVNETA_RXQ_STATUS_UPDATE_REG(rxq->id),
                    (ndescs << MVNETA_RXQ_ADD_NON_OCCUPIED_SHIFT));
}

/* Get number of RX descriptors occupied by received packets */
static int mvneta_rxq_busy_desc_num_get(struct mvneta_port *pp,
                                        struct mvneta_rx_queue *rxq)
{
        u32 val;

        val = mvreg_read(pp, MVNETA_RXQ_STATUS_REG(rxq->id));
        return val & MVNETA_RXQ_OCCUPIED_ALL_MASK;
}

/* Update num of rx desc called upon return from rx path or
 * from mvneta_rxq_drop_pkts().
 */
static void mvneta_rxq_desc_num_update(struct mvneta_port *pp,
                                       struct mvneta_rx_queue *rxq,
                                       int rx_done, int rx_filled)
{
        u32 val;

        if ((rx_done <= 0xff) && (rx_filled <= 0xff)) {
                val = rx_done |
                  (rx_filled << MVNETA_RXQ_ADD_NON_OCCUPIED_SHIFT);
                mvreg_write(pp, MVNETA_RXQ_STATUS_UPDATE_REG(rxq->id), val);
                return;
        }

        /* Only 255 descriptors can be added at once */
        while ((rx_done > 0) || (rx_filled > 0)) {
                if (rx_done <= 0xff) {
                        val = rx_done;
                        rx_done = 0;
                } else {
                        val = 0xff;
                        rx_done -= 0xff;
                }
                if (rx_filled <= 0xff) {
                        val |= rx_filled << MVNETA_RXQ_ADD_NON_OCCUPIED_SHIFT;
                        rx_filled = 0;
                } else {
                        val |= 0xff << MVNETA_RXQ_ADD_NON_OCCUPIED_SHIFT;
                        rx_filled -= 0xff;
                }
                mvreg_write(pp, MVNETA_RXQ_STATUS_UPDATE_REG(rxq->id), val);
        }
}

/* Get pointer to next RX descriptor to be processed by SW */
static struct mvneta_rx_desc *
mvneta_rxq_next_desc_get(struct mvneta_rx_queue *rxq)
{
        int rx_desc = rxq->next_desc_to_proc;

        rxq->next_desc_to_proc = MVNETA_QUEUE_NEXT_DESC(rxq, rx_desc);
        return rxq->descs + rx_desc;
}

/* Tx descriptors helper methods */

/* Update HW with number of TX descriptors to be sent */
static void mvneta_txq_pend_desc_add(struct mvneta_port *pp,
                                     struct mvneta_tx_queue *txq,
                                     int pend_desc)
{
        u32 val;

        /* Only 255 descriptors can be added at once ; Assume caller
         * process TX desriptors in quanta less than 256
         */
        val = pend_desc;
        mvreg_write(pp, MVNETA_TXQ_UPDATE_REG(txq->id), val);
}

/* Get pointer to next TX descriptor to be processed (send) by HW */
static struct mvneta_tx_desc *
mvneta_txq_next_desc_get(struct mvneta_tx_queue *txq)
{
        int tx_desc = txq->next_desc_to_proc;

        txq->next_desc_to_proc = MVNETA_QUEUE_NEXT_DESC(txq, tx_desc);
        return txq->descs + tx_desc;
}

/* Set rxq buf size */
static void mvneta_rxq_buf_size_set(struct mvneta_port *pp,
                                    struct mvneta_rx_queue *rxq,
                                    int buf_size)
{
        u32 val;

        val = mvreg_read(pp, MVNETA_RXQ_SIZE_REG(rxq->id));

        val &= ~MVNETA_RXQ_BUF_SIZE_MASK;
        val |= ((buf_size >> 3) << MVNETA_RXQ_BUF_SIZE_SHIFT);

        mvreg_write(pp, MVNETA_RXQ_SIZE_REG(rxq->id), val);
}

/* Start the Ethernet port RX and TX activity */
static void mvneta_port_up(struct mvneta_port *pp)
{
        int queue;
        u32 q_map;

        /* Enable all initialized TXs. */
        mvneta_mib_counters_clear(pp);
        q_map = 0;
        for (queue = 0; queue < txq_number; queue++) {
                struct mvneta_tx_queue *txq = &pp->txqs[queue];
                if (txq->descs != NULL)
                        q_map |= (1 << queue);
        }
        mvreg_write(pp, MVNETA_TXQ_CMD, q_map);

        /* Enable all initialized RXQs. */
        q_map = 0;
        for (queue = 0; queue < rxq_number; queue++) {
                struct mvneta_rx_queue *rxq = &pp->rxqs[queue];
                if (rxq->descs != NULL)
                        q_map |= (1 << queue);
        }
        mvreg_write(pp, MVNETA_RXQ_CMD, q_map);
}

/* Stop the Ethernet port activity */
static void mvneta_port_down(struct mvneta_port *pp)
{
        u32 val;
        int count;

        /* Stop Rx port activity. Check port Rx activity. */
        val = mvreg_read(pp, MVNETA_RXQ_CMD) & MVNETA_RXQ_ENABLE_MASK;

        /* Issue stop command for active channels only */
        if (val != 0)
                mvreg_write(pp, MVNETA_RXQ_CMD,
                            val << MVNETA_RXQ_DISABLE_SHIFT);

        /* Wait for all Rx activity to terminate. */
        count = 0;
        do {
                if (count++ >= MVNETA_RX_DISABLE_TIMEOUT_MSEC) {
                        netdev_warn(pp->dev,
                                    "TIMEOUT for RX stopped ! rx_queue_cmd: 0x08%x\n",
                                    val);
                        break;
                }
                mdelay(1);

                val = mvreg_read(pp, MVNETA_RXQ_CMD);
        } while (val & 0xff);

        /* Stop Tx port activity. Check port Tx activity. Issue stop
         * command for active channels only
         */
        val = (mvreg_read(pp, MVNETA_TXQ_CMD)) & MVNETA_TXQ_ENABLE_MASK;

        if (val != 0)
                mvreg_write(pp, MVNETA_TXQ_CMD,
                            (val << MVNETA_TXQ_DISABLE_SHIFT));

        /* Wait for all Tx activity to terminate. */
        count = 0;
        do {
                if (count++ >= MVNETA_TX_DISABLE_TIMEOUT_MSEC) {
                        netdev_warn(pp->dev,
                                    "TIMEOUT for TX stopped status=0x%08x\n",
                                    val);
                        break;
                }
                mdelay(1);

                /* Check TX Command reg that all Txqs are stopped */
                val = mvreg_read(pp, MVNETA_TXQ_CMD);

        } while (val & 0xff);

        /* Double check to verify that TX FIFO is empty */
        count = 0;
        do {
                if (count++ >= MVNETA_TX_FIFO_EMPTY_TIMEOUT) {
                        netdev_warn(pp->dev,
                                    "TX FIFO empty timeout status=0x08%x\n",
                                    val);
                        break;
                }
                mdelay(1);

                val = mvreg_read(pp, MVNETA_PORT_STATUS);
        } while (!(val & MVNETA_TX_FIFO_EMPTY) &&
                 (val & MVNETA_TX_IN_PRGRS));

        udelay(200);
}

/* Enable the port by setting the port enable bit of the MAC control register */
static void mvneta_port_enable(struct mvneta_port *pp)
{
        u32 val;

        /* Enable port */
        val = mvreg_read(pp, MVNETA_GMAC_CTRL_0);
        val |= MVNETA_GMAC0_PORT_ENABLE;
        mvreg_write(pp, MVNETA_GMAC_CTRL_0, val);
}

/* Disable the port and wait for about 200 usec before retuning */
static void mvneta_port_disable(struct mvneta_port *pp)
{
        u32 val;

        /* Reset the Enable bit in the Serial Control Register */
        val = mvreg_read(pp, MVNETA_GMAC_CTRL_0);
        val &= ~MVNETA_GMAC0_PORT_ENABLE;
        mvreg_write(pp, MVNETA_GMAC_CTRL_0, val);

        udelay(200);
}

/* Multicast tables methods */

/* Set all entries in Unicast MAC Table; queue==-1 means reject all */
static void mvneta_set_ucast_table(struct mvneta_port *pp, int queue)
{
        int offset;
        u32 val;

        if (queue == -1) {
                val = 0;
        } else {
                val = 0x1 | (queue << 1);
                val |= (val << 24) | (val << 16) | (val << 8);
        }

        for (offset = 0; offset <= 0xc; offset += 4)
                mvreg_write(pp, MVNETA_DA_FILT_UCAST_BASE + offset, val);
}

/* Set all entries in Special Multicast MAC Table; queue==-1 means reject all */
static void mvneta_set_special_mcast_table(struct mvneta_port *pp, int queue)
{
        int offset;
        u32 val;

        if (queue == -1) {
                val = 0;
        } else {
                val = 0x1 | (queue << 1);
                val |= (val << 24) | (val << 16) | (val << 8);
        }

        for (offset = 0; offset <= 0xfc; offset += 4)
                mvreg_write(pp, MVNETA_DA_FILT_SPEC_MCAST + offset, val);
}

/* Set all entries in Other Multicast MAC Table. queue==-1 means reject all */
static void mvneta_set_other_mcast_table(struct mvneta_port *pp, int queue)
{
        int offset;
        u32 val;

        if (queue == -1) {
                memset(pp->mcast_count, 0, sizeof(pp->mcast_count));
                val = 0;
        } else {
                memset(pp->mcast_count, 1, sizeof(pp->mcast_count));
                val = 0x1 | (queue << 1);
                val |= (val << 24) | (val << 16) | (val << 8);
        }

        for (offset = 0; offset <= 0xfc; offset += 4)
                mvreg_write(pp, MVNETA_DA_FILT_OTH_MCAST + offset, val);
}

/* This method sets defaults to the NETA port:
 *      Clears interrupt Cause and Mask registers.
 *      Clears all MAC tables.
 *      Sets defaults to all registers.
 *      Resets RX and TX descriptor rings.
 *      Resets PHY.
 * This method can be called after mvneta_port_down() to return the port
 *      settings to defaults.
 */
static void mvneta_defaults_set(struct mvneta_port *pp)
{
        int cpu;
        int queue;
        u32 val;

        /* Clear all Cause registers */
        mvreg_write(pp, MVNETA_INTR_NEW_CAUSE, 0);
        mvreg_write(pp, MVNETA_INTR_OLD_CAUSE, 0);
        mvreg_write(pp, MVNETA_INTR_MISC_CAUSE, 0);

        /* Mask all interrupts */
        mvreg_write(pp, MVNETA_INTR_NEW_MASK, 0);
        mvreg_write(pp, MVNETA_INTR_OLD_MASK, 0);
        mvreg_write(pp, MVNETA_INTR_MISC_MASK, 0);
        mvreg_write(pp, MVNETA_INTR_ENABLE, 0);

        /* Enable MBUS Retry bit16 */
        mvreg_write(pp, MVNETA_MBUS_RETRY, 0x20);

        /* Set CPU queue access map - all CPUs have access to all RX
         * queues and to all TX queues
         */
        for (cpu = 0; cpu < CONFIG_NR_CPUS; cpu++)
                mvreg_write(pp, MVNETA_CPU_MAP(cpu),
                            (MVNETA_CPU_RXQ_ACCESS_ALL_MASK |
                             MVNETA_CPU_TXQ_ACCESS_ALL_MASK));

        /* Reset RX and TX DMAs */
        mvreg_write(pp, MVNETA_PORT_RX_RESET, MVNETA_PORT_RX_DMA_RESET);
        mvreg_write(pp, MVNETA_PORT_TX_RESET, MVNETA_PORT_TX_DMA_RESET);

        /* Disable Legacy WRR, Disable EJP, Release from reset */
        mvreg_write(pp, MVNETA_TXQ_CMD_1, 0);
        for (queue = 0; queue < txq_number; queue++) {
                mvreg_write(pp, MVETH_TXQ_TOKEN_COUNT_REG(queue), 0);
                mvreg_write(pp, MVETH_TXQ_TOKEN_CFG_REG(queue), 0);
        }

        mvreg_write(pp, MVNETA_PORT_TX_RESET, 0);
        mvreg_write(pp, MVNETA_PORT_RX_RESET, 0);

        /* Set Port Acceleration Mode */
        val = MVNETA_ACC_MODE_EXT;
        mvreg_write(pp, MVNETA_ACC_MODE, val);

        /* Update val of portCfg register accordingly with all RxQueue types */
        val = MVNETA_PORT_CONFIG_DEFL_VALUE(rxq_def);
        mvreg_write(pp, MVNETA_PORT_CONFIG, val);

        val = 0;
        mvreg_write(pp, MVNETA_PORT_CONFIG_EXTEND, val);
        mvreg_write(pp, MVNETA_RX_MIN_FRAME_SIZE, 64);

        /* Build PORT_SDMA_CONFIG_REG */
        val = 0;

        /* Default burst size */
        val |= MVNETA_TX_BRST_SZ_MASK(MVNETA_SDMA_BRST_SIZE_16);
        val |= MVNETA_RX_BRST_SZ_MASK(MVNETA_SDMA_BRST_SIZE_16);
        val |= MVNETA_RX_NO_DATA_SWAP | MVNETA_TX_NO_DATA_SWAP;

        /* Assign port SDMA configuration */
        mvreg_write(pp, MVNETA_SDMA_CONFIG, val);

        /* Enable PHY polling in hardware for U-Boot */
        val = mvreg_read(pp, MVNETA_UNIT_CONTROL);
        val |= MVNETA_PHY_POLLING_ENABLE;
        mvreg_write(pp, MVNETA_UNIT_CONTROL, val);

        mvneta_set_ucast_table(pp, -1);
        mvneta_set_special_mcast_table(pp, -1);
        mvneta_set_other_mcast_table(pp, -1);
}

/* Set unicast address */
static void mvneta_set_ucast_addr(struct mvneta_port *pp, u8 last_nibble,
                                  int queue)
{
        unsigned int unicast_reg;
        unsigned int tbl_offset;
        unsigned int reg_offset;

        /* Locate the Unicast table entry */
        last_nibble = (0xf & last_nibble);

        /* offset from unicast tbl base */
        tbl_offset = (last_nibble / 4) * 4;

        /* offset within the above reg  */
        reg_offset = last_nibble % 4;

        unicast_reg = mvreg_read(pp, (MVNETA_DA_FILT_UCAST_BASE + tbl_offset));

        if (queue == -1) {
                /* Clear accepts frame bit at specified unicast DA tbl entry */
                unicast_reg &= ~(0xff << (8 * reg_offset));
        } else {
                unicast_reg &= ~(0xff << (8 * reg_offset));
                unicast_reg |= ((0x01 | (queue << 1)) << (8 * reg_offset));
        }

        mvreg_write(pp, (MVNETA_DA_FILT_UCAST_BASE + tbl_offset), unicast_reg);
}

/* Set mac address */
static void mvneta_mac_addr_set(struct mvneta_port *pp, unsigned char *addr,
                                int queue)
{
        unsigned int mac_h;
        unsigned int mac_l;

        if (queue != -1) {
                mac_l = (addr[4] << 8) | (addr[5]);
                mac_h = (addr[0] << 24) | (addr[1] << 16) |
                        (addr[2] << 8) | (addr[3] << 0);

                mvreg_write(pp, MVNETA_MAC_ADDR_LOW, mac_l);
                mvreg_write(pp, MVNETA_MAC_ADDR_HIGH, mac_h);
        }

        /* Accept frames of this address */
        mvneta_set_ucast_addr(pp, addr[5], queue);
}

/* Handle rx descriptor fill by setting buf_cookie and buf_phys_addr */
static void mvneta_rx_desc_fill(struct mvneta_rx_desc *rx_desc,
                                u32 phys_addr, u32 cookie)
{
        rx_desc->buf_cookie = cookie;
        rx_desc->buf_phys_addr = phys_addr;
}

/* Decrement sent descriptors counter */
static void mvneta_txq_sent_desc_dec(struct mvneta_port *pp,
                                     struct mvneta_tx_queue *txq,
                                     int sent_desc)
{
        u32 val;

        /* Only 255 TX descriptors can be updated at once */
        while (sent_desc > 0xff) {
                val = 0xff << MVNETA_TXQ_DEC_SENT_SHIFT;
                mvreg_write(pp, MVNETA_TXQ_UPDATE_REG(txq->id), val);
                sent_desc = sent_desc - 0xff;
        }

        val = sent_desc << MVNETA_TXQ_DEC_SENT_SHIFT;
        mvreg_write(pp, MVNETA_TXQ_UPDATE_REG(txq->id), val);
}

/* Get number of TX descriptors already sent by HW */
static int mvneta_txq_sent_desc_num_get(struct mvneta_port *pp,
                                        struct mvneta_tx_queue *txq)
{
        u32 val;
        int sent_desc;

        val = mvreg_read(pp, MVNETA_TXQ_STATUS_REG(txq->id));
        sent_desc = (val & MVNETA_TXQ_SENT_DESC_MASK) >>
                MVNETA_TXQ_SENT_DESC_SHIFT;

        return sent_desc;
}

/* Display more error info */
static void mvneta_rx_error(struct mvneta_port *pp,
                            struct mvneta_rx_desc *rx_desc)
{
        u32 status = rx_desc->status;

        if (!mvneta_rxq_desc_is_first_last(status)) {
                netdev_err(pp->dev,
                           "bad rx status %08x (buffer oversize), size=%d\n",
                           status, rx_desc->data_size);
                return;
        }

        switch (status & MVNETA_RXD_ERR_CODE_MASK) {
        case MVNETA_RXD_ERR_CRC:
                netdev_err(pp->dev, "bad rx status %08x (crc error), size=%d\n",
                           status, rx_desc->data_size);
                break;
        case MVNETA_RXD_ERR_OVERRUN:
                netdev_err(pp->dev, "bad rx status %08x (overrun error), size=%d\n",
                           status, rx_desc->data_size);
                break;
        case MVNETA_RXD_ERR_LEN:
                netdev_err(pp->dev, "bad rx status %08x (max frame length error), size=%d\n",
                           status, rx_desc->data_size);
                break;
        case MVNETA_RXD_ERR_RESOURCE:
                netdev_err(pp->dev, "bad rx status %08x (resource error), size=%d\n",
                           status, rx_desc->data_size);
                break;
        }
}

static struct mvneta_rx_queue *mvneta_rxq_handle_get(struct mvneta_port *pp,
                                                     int rxq)
{
        return &pp->rxqs[rxq];
}


/* Drop packets received by the RXQ and free buffers */
static void mvneta_rxq_drop_pkts(struct mvneta_port *pp,
                                 struct mvneta_rx_queue *rxq)
{
        int rx_done;

        rx_done = mvneta_rxq_busy_desc_num_get(pp, rxq);
        if (rx_done)
                mvneta_rxq_desc_num_update(pp, rxq, rx_done, rx_done);
}

/* Handle rxq fill: allocates rxq skbs; called when initializing a port */
static int mvneta_rxq_fill(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
                           int num)
{
        int i;

        for (i = 0; i < num; i++) {
                u32 addr;

                /* U-Boot special: Fill in the rx buffer addresses */
                addr = buffer_loc.rx_buffers + (i * RX_BUFFER_SIZE);
                mvneta_rx_desc_fill(rxq->descs + i, addr, addr);
        }

        /* Add this number of RX descriptors as non occupied (ready to
         * get packets)
         */
        mvneta_rxq_non_occup_desc_add(pp, rxq, i);

        return 0;
}

/* Rx/Tx queue initialization/cleanup methods */

/* Create a specified RX queue */
static int mvneta_rxq_init(struct mvneta_port *pp,
                           struct mvneta_rx_queue *rxq)

{
        rxq->size = pp->rx_ring_size;

        /* Allocate memory for RX descriptors */
        rxq->descs_phys = (dma_addr_t)rxq->descs;
        if (rxq->descs == NULL)
                return -ENOMEM;

        rxq->last_desc = rxq->size - 1;

        /* Set Rx descriptors queue starting address */
        mvreg_write(pp, MVNETA_RXQ_BASE_ADDR_REG(rxq->id), rxq->descs_phys);
        mvreg_write(pp, MVNETA_RXQ_SIZE_REG(rxq->id), rxq->size);

        /* Fill RXQ with buffers from RX pool */
        mvneta_rxq_buf_size_set(pp, rxq, RX_BUFFER_SIZE);
        mvneta_rxq_fill(pp, rxq, rxq->size);

        return 0;
}

/* Cleanup Rx queue */
static void mvneta_rxq_deinit(struct mvneta_port *pp,
                              struct mvneta_rx_queue *rxq)
{
        mvneta_rxq_drop_pkts(pp, rxq);

        rxq->descs             = NULL;
        rxq->last_desc         = 0;
        rxq->next_desc_to_proc = 0;
        rxq->descs_phys        = 0;
}

/* Create and initialize a tx queue */
static int mvneta_txq_init(struct mvneta_port *pp,
                           struct mvneta_tx_queue *txq)
{
        txq->size = pp->tx_ring_size;

        /* Allocate memory for TX descriptors */
        txq->descs_phys = (u32)txq->descs;
        if (txq->descs == NULL)
                return -ENOMEM;

        txq->last_desc = txq->size - 1;

        /* Set maximum bandwidth for enabled TXQs */
        mvreg_write(pp, MVETH_TXQ_TOKEN_CFG_REG(txq->id), 0x03ffffff);
        mvreg_write(pp, MVETH_TXQ_TOKEN_COUNT_REG(txq->id), 0x3fffffff);

        /* Set Tx descriptors queue starting address */
        mvreg_write(pp, MVNETA_TXQ_BASE_ADDR_REG(txq->id), txq->descs_phys);
        mvreg_write(pp, MVNETA_TXQ_SIZE_REG(txq->id), txq->size);

        return 0;
}

/* Free allocated resources when mvneta_txq_init() fails to allocate memory*/
static void mvneta_txq_deinit(struct mvneta_port *pp,
                              struct mvneta_tx_queue *txq)
{
        txq->descs             = NULL;
        txq->last_desc         = 0;
        txq->next_desc_to_proc = 0;
        txq->descs_phys        = 0;

        /* Set minimum bandwidth for disabled TXQs */
        mvreg_write(pp, MVETH_TXQ_TOKEN_CFG_REG(txq->id), 0);
        mvreg_write(pp, MVETH_TXQ_TOKEN_COUNT_REG(txq->id), 0);

        /* Set Tx descriptors queue starting address and size */
        mvreg_write(pp, MVNETA_TXQ_BASE_ADDR_REG(txq->id), 0);
        mvreg_write(pp, MVNETA_TXQ_SIZE_REG(txq->id), 0);
}

/* Cleanup all Tx queues */
static void mvneta_cleanup_txqs(struct mvneta_port *pp)
{
        int queue;

        for (queue = 0; queue < txq_number; queue++)
                mvneta_txq_deinit(pp, &pp->txqs[queue]);
}

/* Cleanup all Rx queues */
static void mvneta_cleanup_rxqs(struct mvneta_port *pp)
{
        int queue;

        for (queue = 0; queue < rxq_number; queue++)
                mvneta_rxq_deinit(pp, &pp->rxqs[queue]);
}


/* Init all Rx queues */
static int mvneta_setup_rxqs(struct mvneta_port *pp)
{
        int queue;

        for (queue = 0; queue < rxq_number; queue++) {
                int err = mvneta_rxq_init(pp, &pp->rxqs[queue]);
                if (err) {
                        netdev_err(pp->dev, "%s: can't create rxq=%d\n",
                                   __func__, queue);
                        mvneta_cleanup_rxqs(pp);
                        return err;
                }
        }

        return 0;
}

/* Init all tx queues */
static int mvneta_setup_txqs(struct mvneta_port *pp)
{
        int queue;

        for (queue = 0; queue < txq_number; queue++) {
                int err = mvneta_txq_init(pp, &pp->txqs[queue]);
                if (err) {
                        netdev_err(pp->dev, "%s: can't create txq=%d\n",
                                   __func__, queue);
                        mvneta_cleanup_txqs(pp);
                        return err;
                }
        }

        return 0;
}

static void mvneta_start_dev(struct mvneta_port *pp)
{
        /* start the Rx/Tx activity */
        mvneta_port_enable(pp);
}

static void mvneta_adjust_link(struct eth_device *dev)
{
        struct mvneta_port *pp = dev->priv;
        struct phy_device *phydev = pp->phydev;
        int status_change = 0;

        if (phydev->link) {
                if ((pp->speed != phydev->speed) ||
                    (pp->duplex != phydev->duplex)) {
                        u32 val;

                        val = mvreg_read(pp, MVNETA_GMAC_AUTONEG_CONFIG);
                        val &= ~(MVNETA_GMAC_CONFIG_MII_SPEED |
                                 MVNETA_GMAC_CONFIG_GMII_SPEED |
                                 MVNETA_GMAC_CONFIG_FULL_DUPLEX |
                                 MVNETA_GMAC_AN_SPEED_EN |
                                 MVNETA_GMAC_AN_DUPLEX_EN);

                        if (phydev->duplex)
                                val |= MVNETA_GMAC_CONFIG_FULL_DUPLEX;

                        if (phydev->speed == SPEED_1000)
                                val |= MVNETA_GMAC_CONFIG_GMII_SPEED;
                        else
                                val |= MVNETA_GMAC_CONFIG_MII_SPEED;

                        mvreg_write(pp, MVNETA_GMAC_AUTONEG_CONFIG, val);

                        pp->duplex = phydev->duplex;
                        pp->speed  = phydev->speed;
                }
        }

        if (phydev->link != pp->link) {
                if (!phydev->link) {
                        pp->duplex = -1;
                        pp->speed = 0;
                }

                pp->link = phydev->link;
                status_change = 1;
        }

        if (status_change) {
                if (phydev->link) {
                        u32 val = mvreg_read(pp, MVNETA_GMAC_AUTONEG_CONFIG);
                        val |= (MVNETA_GMAC_FORCE_LINK_PASS |
                                MVNETA_GMAC_FORCE_LINK_DOWN);
                        mvreg_write(pp, MVNETA_GMAC_AUTONEG_CONFIG, val);
                        mvneta_port_up(pp);
                } else {
                        mvneta_port_down(pp);
                }
        }
}

static int mvneta_open(struct eth_device *dev)
{
        struct mvneta_port *pp = dev->priv;
        int ret;

        ret = mvneta_setup_rxqs(pp);
        if (ret)
                return ret;

        ret = mvneta_setup_txqs(pp);
        if (ret)
                return ret;

        mvneta_adjust_link(dev);

        mvneta_start_dev(pp);

        return 0;
}

/* Initialize hw */
static int mvneta_init(struct mvneta_port *pp)
{
        int queue;

        /* Disable port */
        mvneta_port_disable(pp);

        /* Set port default values */
        mvneta_defaults_set(pp);

        pp->txqs = kzalloc(txq_number * sizeof(struct mvneta_tx_queue),
                           GFP_KERNEL);
        if (!pp->txqs)
                return -ENOMEM;

        /* U-Boot special: use preallocated area */
        pp->txqs[0].descs = buffer_loc.tx_descs;

        /* Initialize TX descriptor rings */
        for (queue = 0; queue < txq_number; queue++) {
                struct mvneta_tx_queue *txq = &pp->txqs[queue];
                txq->id = queue;
                txq->size = pp->tx_ring_size;
        }

        pp->rxqs = kzalloc(rxq_number * sizeof(struct mvneta_rx_queue),
                           GFP_KERNEL);
        if (!pp->rxqs) {
                kfree(pp->txqs);
                return -ENOMEM;
        }

        /* U-Boot special: use preallocated area */
        pp->rxqs[0].descs = buffer_loc.rx_descs;

        /* Create Rx descriptor rings */
        for (queue = 0; queue < rxq_number; queue++) {
                struct mvneta_rx_queue *rxq = &pp->rxqs[queue];
                rxq->id = queue;
                rxq->size = pp->rx_ring_size;
        }

        return 0;
}

/* platform glue : initialize decoding windows */
static void mvneta_conf_mbus_windows(struct mvneta_port *pp)
{
        const struct mbus_dram_target_info *dram;
        u32 win_enable;
        u32 win_protect;
        int i;

        dram = mvebu_mbus_dram_info();
        for (i = 0; i < 6; i++) {
                mvreg_write(pp, MVNETA_WIN_BASE(i), 0);
                mvreg_write(pp, MVNETA_WIN_SIZE(i), 0);

                if (i < 4)
                        mvreg_write(pp, MVNETA_WIN_REMAP(i), 0);
        }

        win_enable = 0x3f;
        win_protect = 0;

        for (i = 0; i < dram->num_cs; i++) {
                const struct mbus_dram_window *cs = dram->cs + i;
                mvreg_write(pp, MVNETA_WIN_BASE(i), (cs->base & 0xffff0000) |
                            (cs->mbus_attr << 8) | dram->mbus_dram_target_id);

                mvreg_write(pp, MVNETA_WIN_SIZE(i),
                            (cs->size - 1) & 0xffff0000);

                win_enable &= ~(1 << i);
                win_protect |= 3 << (2 * i);
        }

        mvreg_write(pp, MVNETA_BASE_ADDR_ENABLE, win_enable);
}

/* Power up the port */
static int mvneta_port_power_up(struct mvneta_port *pp, int phy_mode)
{
        u32 ctrl;

        /* MAC Cause register should be cleared */
        mvreg_write(pp, MVNETA_UNIT_INTR_CAUSE, 0);

        ctrl = mvreg_read(pp, MVNETA_GMAC_CTRL_2);

        /* Even though it might look weird, when we're configured in
         * SGMII or QSGMII mode, the RGMII bit needs to be set.
         */
        switch (phy_mode) {
        case PHY_INTERFACE_MODE_QSGMII:
                mvreg_write(pp, MVNETA_SERDES_CFG, MVNETA_QSGMII_SERDES_PROTO);
                ctrl |= MVNETA_GMAC2_PCS_ENABLE | MVNETA_GMAC2_PORT_RGMII;
                break;
        case PHY_INTERFACE_MODE_SGMII:
                mvreg_write(pp, MVNETA_SERDES_CFG, MVNETA_SGMII_SERDES_PROTO);
                ctrl |= MVNETA_GMAC2_PCS_ENABLE | MVNETA_GMAC2_PORT_RGMII;
                break;
        case PHY_INTERFACE_MODE_RGMII:
        case PHY_INTERFACE_MODE_RGMII_ID:
                ctrl |= MVNETA_GMAC2_PORT_RGMII;
                break;
        default:
                return -EINVAL;
        }

        /* Cancel Port Reset */
        ctrl &= ~MVNETA_GMAC2_PORT_RESET;
        mvreg_write(pp, MVNETA_GMAC_CTRL_2, ctrl);

        while ((mvreg_read(pp, MVNETA_GMAC_CTRL_2) &
                MVNETA_GMAC2_PORT_RESET) != 0)
                continue;

        return 0;
}

/* Device initialization routine */
static int mvneta_probe(struct eth_device *dev)
{
        struct mvneta_port *pp = dev->priv;
        int err;

        pp->tx_ring_size = MVNETA_MAX_TXD;
        pp->rx_ring_size = MVNETA_MAX_RXD;

        err = mvneta_init(pp);
        if (err < 0) {
                dev_err(&pdev->dev, "can't init eth hal\n");
                return err;
        }

        mvneta_conf_mbus_windows(pp);

        mvneta_mac_addr_set(pp, dev->enetaddr, rxq_def);

        err = mvneta_port_power_up(pp, pp->phy_interface);
        if (err < 0) {
                dev_err(&pdev->dev, "can't power up port\n");
                return err;
        }

        /* Call open() now as it needs to be done before runing send() */
        mvneta_open(dev);

        return 0;
}

/* U-Boot only functions follow here */

/* SMI / MDIO functions */

static int smi_wait_ready(struct mvneta_port *pp)
{
        u32 timeout = MVNETA_SMI_TIMEOUT;
        u32 smi_reg;

        /* wait till the SMI is not busy */
        do {
                /* read smi register */
                smi_reg = mvreg_read(pp, MVNETA_SMI);
                if (timeout-- == 0) {
                        printf("Error: SMI busy timeout\n");
                        return -EFAULT;
                }
        } while (smi_reg & MVNETA_SMI_BUSY);

        return 0;
}

/*
 * smi_reg_read - miiphy_read callback function.
 *
 * Returns 16bit phy register value, or 0xffff on error
 */
static int smi_reg_read(const char *devname, u8 phy_adr, u8 reg_ofs, u16 *data)
{
        struct eth_device *dev = eth_get_dev_by_name(devname);
        struct mvneta_port *pp = dev->priv;
        u32 smi_reg;
        u32 timeout;

        /* check parameters */
        if (phy_adr > MVNETA_PHY_ADDR_MASK) {
                printf("Error: Invalid PHY address %d\n", phy_adr);
                return -EFAULT;
        }

        if (reg_ofs > MVNETA_PHY_REG_MASK) {
                printf("Err: Invalid register offset %d\n", reg_ofs);
                return -EFAULT;
        }

        /* wait till the SMI is not busy */
        if (smi_wait_ready(pp) < 0)
                return -EFAULT;

        /* fill the phy address and regiser offset and read opcode */
        smi_reg = (phy_adr << MVNETA_SMI_DEV_ADDR_OFFS)
                | (reg_ofs << MVNETA_SMI_REG_ADDR_OFFS)
                | MVNETA_SMI_OPCODE_READ;

        /* write the smi register */
        mvreg_write(pp, MVNETA_SMI, smi_reg);

        /*wait till read value is ready */
        timeout = MVNETA_SMI_TIMEOUT;

        do {
                /* read smi register */
                smi_reg = mvreg_read(pp, MVNETA_SMI);
                if (timeout-- == 0) {
                        printf("Err: SMI read ready timeout\n");
                        return -EFAULT;
                }
        } while (!(smi_reg & MVNETA_SMI_READ_VALID));

        /* Wait for the data to update in the SMI register */
        for (timeout = 0; timeout < MVNETA_SMI_TIMEOUT; timeout++)
                ;

        *data = (u16)(mvreg_read(pp, MVNETA_SMI) & MVNETA_SMI_DATA_MASK);

        return 0;
}

/*
 * smi_reg_write - imiiphy_write callback function.
 *
 * Returns 0 if write succeed, -EINVAL on bad parameters
 * -ETIME on timeout
 */
static int smi_reg_write(const char *devname, u8 phy_adr, u8 reg_ofs, u16 data)
{
        struct eth_device *dev = eth_get_dev_by_name(devname);
        struct mvneta_port *pp = dev->priv;
        u32 smi_reg;

        /* check parameters */
        if (phy_adr > MVNETA_PHY_ADDR_MASK) {
                printf("Error: Invalid PHY address %d\n", phy_adr);
                return -EFAULT;
        }

        if (reg_ofs > MVNETA_PHY_REG_MASK) {
                printf("Err: Invalid register offset %d\n", reg_ofs);
                return -EFAULT;
        }

        /* wait till the SMI is not busy */
        if (smi_wait_ready(pp) < 0)
                return -EFAULT;

        /* fill the phy addr and reg offset and write opcode and data */
        smi_reg = (data << MVNETA_SMI_DATA_OFFS);
        smi_reg |= (phy_adr << MVNETA_SMI_DEV_ADDR_OFFS)
                | (reg_ofs << MVNETA_SMI_REG_ADDR_OFFS);
        smi_reg &= ~MVNETA_SMI_OPCODE_READ;

        /* write the smi register */
        mvreg_write(pp, MVNETA_SMI, smi_reg);

        return 0;
}

static int mvneta_init_u_boot(struct eth_device *dev, bd_t *bis)
{
        struct mvneta_port *pp = dev->priv;
        struct phy_device *phydev;

        mvneta_port_power_up(pp, pp->phy_interface);

        if (!pp->init || pp->link == 0) {
                /* Set phy address of the port */
                mvreg_write(pp, MVNETA_PHY_ADDR, pp->phyaddr);
                phydev = phy_connect(pp->bus, pp->phyaddr, dev,
                                     pp->phy_interface);

                pp->phydev = phydev;
                phy_config(phydev);
                phy_startup(phydev);
                if (!phydev->link) {
                        printf("%s: No link.\n", phydev->dev->name);
                        return -1;
                }

                /* Full init on first call */
                mvneta_probe(dev);
                pp->init = 1;
        } else {
                /* Upon all following calls, this is enough */
                mvneta_port_up(pp);
                mvneta_port_enable(pp);
        }

        return 0;
}

static int mvneta_send(struct eth_device *dev, void *ptr, int len)
{
        struct mvneta_port *pp = dev->priv;
        struct mvneta_tx_queue *txq = &pp->txqs[0];
        struct mvneta_tx_desc *tx_desc;
        int sent_desc;
        u32 timeout = 0;

        /* Get a descriptor for the first part of the packet */
        tx_desc = mvneta_txq_next_desc_get(txq);

        tx_desc->buf_phys_addr = (u32)ptr;
        tx_desc->data_size = len;
        flush_dcache_range((u32)ptr, (u32)ptr + len);

        /* First and Last descriptor */
        tx_desc->command = MVNETA_TX_L4_CSUM_NOT | MVNETA_TXD_FLZ_DESC;
        mvneta_txq_pend_desc_add(pp, txq, 1);

        /* Wait for packet to be sent (queue might help with speed here) */
        sent_desc = mvneta_txq_sent_desc_num_get(pp, txq);
        while (!sent_desc) {
                if (timeout++ > 10000) {
                        printf("timeout: packet not sent\n");
                        return -1;
                }
                sent_desc = mvneta_txq_sent_desc_num_get(pp, txq);
        }

        /* txDone has increased - hw sent packet */
        mvneta_txq_sent_desc_dec(pp, txq, sent_desc);
        return 0;

        return 0;
}

static int mvneta_recv(struct eth_device *dev)
{
        struct mvneta_port *pp = dev->priv;
        int rx_done;
        int packets_done;
        struct mvneta_rx_queue *rxq;

        /* get rx queue */
        rxq = mvneta_rxq_handle_get(pp, rxq_def);
        rx_done = mvneta_rxq_busy_desc_num_get(pp, rxq);
        packets_done = rx_done;

        while (packets_done--) {
                struct mvneta_rx_desc *rx_desc;
                unsigned char *data;
                u32 rx_status;
                int rx_bytes;

                /*
                 * No cache invalidation needed here, since the desc's are
                 * located in a uncached memory region
                 */
                rx_desc = mvneta_rxq_next_desc_get(rxq);

                rx_status = rx_desc->status;
                if (!mvneta_rxq_desc_is_first_last(rx_status) ||
                    (rx_status & MVNETA_RXD_ERR_SUMMARY)) {
                        mvneta_rx_error(pp, rx_desc);
                        /* leave the descriptor untouched */
                        continue;
                }

                /* 2 bytes for marvell header. 4 bytes for crc */
                rx_bytes = rx_desc->data_size - 6;

                /* give packet to stack - skip on first 2 bytes */
                data = (u8 *)rx_desc->buf_cookie + 2;
                /*
                 * No cache invalidation needed here, since the rx_buffer's are
                 * located in a uncached memory region
                 */
                net_process_received_packet(data, rx_bytes);
        }

        /* Update rxq management counters */
        if (rx_done)
                mvneta_rxq_desc_num_update(pp, rxq, rx_done, rx_done);

        return 0;
}

static void mvneta_halt(struct eth_device *dev)
{
        struct mvneta_port *pp = dev->priv;

        mvneta_port_down(pp);
        mvneta_port_disable(pp);
}

int mvneta_initialize(bd_t *bis, int base_addr, int devnum, int phy_addr)
{
        struct eth_device *dev;
        struct mvneta_port *pp;
        void *bd_space;

        dev = calloc(1, sizeof(*dev));
        if (dev == NULL)
                return -ENOMEM;

        pp = calloc(1, sizeof(*pp));
        if (pp == NULL)
                return -ENOMEM;

        dev->priv = pp;

        /*
         * Allocate buffer area for descs and rx_buffers. This is only
         * done once for all interfaces. As only one interface can
         * be active. Make this area DMA save by disabling the D-cache
         */
        if (!buffer_loc.tx_descs) {
                /* Align buffer area for descs and rx_buffers to 1MiB */
                bd_space = memalign(1 << MMU_SECTION_SHIFT, BD_SPACE);
                mmu_set_region_dcache_behaviour((u32)bd_space, BD_SPACE,
                                                DCACHE_OFF);
                buffer_loc.tx_descs = (struct mvneta_tx_desc *)bd_space;
                buffer_loc.rx_descs = (struct mvneta_rx_desc *)
                        ((u32)bd_space +
                         MVNETA_MAX_TXD * sizeof(struct mvneta_tx_desc));
                buffer_loc.rx_buffers = (u32)
                        (bd_space +
                         MVNETA_MAX_TXD * sizeof(struct mvneta_tx_desc) +
                         MVNETA_MAX_RXD * sizeof(struct mvneta_rx_desc));
        }

        sprintf(dev->name, "neta%d", devnum);

        pp->base = (void __iomem *)base_addr;
        dev->iobase = base_addr;
        dev->init = mvneta_init_u_boot;
        dev->halt = mvneta_halt;
        dev->send = mvneta_send;
        dev->recv = mvneta_recv;
        dev->write_hwaddr = NULL;

        /*
         * The PHY interface type is configured via the
         * board specific CONFIG_SYS_NETA_INTERFACE_TYPE
         * define.
         */
        pp->phy_interface = CONFIG_SYS_NETA_INTERFACE_TYPE;

        eth_register(dev);

        pp->phyaddr = phy_addr;
        miiphy_register(dev->name, smi_reg_read, smi_reg_write);
        pp->bus = miiphy_get_dev_by_name(dev->name);

        return 1;
}