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/***********************license start***************
 * Copyright (c) 2003-2010  Cavium Networks (support@cavium.com). All rights
 * reserved.
 *
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.

 *   * Neither the name of Cavium Networks nor the names of
 *     its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written
 *     permission.

 * This Software, including technical data, may be subject to U.S. export  control
 * laws, including the U.S. Export Administration Act and its  associated
 * regulations, and may be subject to export or import  regulations in other
 * countries.

 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
 * AND WITH ALL FAULTS AND CAVIUM  NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR
 * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
 * THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR
 * DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
 * SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
 * MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
 * VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
 * CORRESPONDENCE TO DESCRIPTION. THE ENTIRE  RISK ARISING OUT OF USE OR
 * PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
 ***********************license end**************************************/







/**
 * @file
 *
 * Functions for XAUI initialization, configuration,
 * and monitoring.
 *
 * <hr>$Revision: 52004 $<hr>
 */
#ifdef CVMX_BUILD_FOR_LINUX_KERNEL
#include <asm/octeon/cvmx.h>
#include <asm/octeon/cvmx-config.h>
#ifdef CVMX_ENABLE_PKO_FUNCTIONS
#include <asm/octeon/cvmx-helper.h>
#endif
#include <asm/octeon/cvmx-gmxx-defs.h>
#include <asm/octeon/cvmx-pko-defs.h>
#include <asm/octeon/cvmx-pcsxx-defs.h>
#include <asm/octeon/cvmx-ciu-defs.h>
#else
#include "executive-config.h"
#include "cvmx-config.h"

#ifdef CVMX_ENABLE_PKO_FUNCTIONS

#include "cvmx.h"
#include "cvmx-helper.h"
#endif
#endif

#ifdef CVMX_ENABLE_PKO_FUNCTIONS


/**
 * @INTERNAL
 * Probe a XAUI interface and determine the number of ports
 * connected to it. The XAUI interface should still be down
 * after this call.
 *
 * @param interface Interface to probe
 *
 * @return Number of ports on the interface. Zero to disable.
 */
int __cvmx_helper_xaui_probe(int interface)
{
    int i;
    cvmx_gmxx_hg2_control_t gmx_hg2_control;
    cvmx_gmxx_inf_mode_t mode;

    /* CN63XX Pass 1.0 errata G-14395 requires the QLM De-emphasis be programmed */
    if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_0))
    {
        cvmx_ciu_qlm2_t ciu_qlm;
        ciu_qlm.u64 = cvmx_read_csr(CVMX_CIU_QLM2);
        ciu_qlm.s.txbypass = 1;
        ciu_qlm.s.txdeemph = 0x5;
        ciu_qlm.s.txmargin = 0x1a;
        cvmx_write_csr(CVMX_CIU_QLM2, ciu_qlm.u64);
    }

    /* Due to errata GMX-700 on CN56XXp1.x and CN52XXp1.x, the interface
        needs to be enabled before IPD otherwise per port backpressure
        may not work properly */
    mode.u64 = cvmx_read_csr(CVMX_GMXX_INF_MODE(interface));
    mode.s.en = 1;
    cvmx_write_csr(CVMX_GMXX_INF_MODE(interface), mode.u64);

    __cvmx_helper_setup_gmx(interface, 1);

    /* Setup PKO to support 16 ports for HiGig2 virtual ports. We're pointing
        all of the PKO packet ports for this interface to the XAUI. This allows
        us to use HiGig2 backpressure per port */
    for (i=0; i<16; i++)
    {
        cvmx_pko_mem_port_ptrs_t pko_mem_port_ptrs;
        pko_mem_port_ptrs.u64 = 0;
        /* We set each PKO port to have equal priority in a round robin
            fashion */
        pko_mem_port_ptrs.s.static_p = 0;
        pko_mem_port_ptrs.s.qos_mask = 0xff;
        /* All PKO ports map to the same XAUI hardware port */
        pko_mem_port_ptrs.s.eid = interface*4;
        pko_mem_port_ptrs.s.pid = interface*16 + i;
        cvmx_write_csr(CVMX_PKO_MEM_PORT_PTRS, pko_mem_port_ptrs.u64);
    }

    /* If HiGig2 is enabled return 16 ports, otherwise return 1 port */
    gmx_hg2_control.u64 = cvmx_read_csr(CVMX_GMXX_HG2_CONTROL(interface));
    if (gmx_hg2_control.s.hg2tx_en)
        return 16;
    else
        return 1;
}


/**
 * @INTERNAL
 * Bringup and enable a XAUI interface. After this call packet
 * I/O should be fully functional. This is called with IPD
 * enabled but PKO disabled.
 *
 * @param interface Interface to bring up
 *
 * @return Zero on success, negative on failure
 */
int __cvmx_helper_xaui_enable(int interface)
{
    cvmx_gmxx_prtx_cfg_t          gmx_cfg;
    cvmx_pcsxx_control1_reg_t     xauiCtl;
    cvmx_pcsxx_misc_ctl_reg_t     xauiMiscCtl;
    cvmx_gmxx_tx_xaui_ctl_t       gmxXauiTxCtl;
    cvmx_helper_link_info_t       link_info;

    /* (1) Interface has already been enabled. */

    /* (2) Disable GMX. */
    xauiMiscCtl.u64 = cvmx_read_csr(CVMX_PCSXX_MISC_CTL_REG(interface));
    xauiMiscCtl.s.gmxeno = 1;
    cvmx_write_csr (CVMX_PCSXX_MISC_CTL_REG(interface), xauiMiscCtl.u64);

    /* (3) Disable GMX and PCSX interrupts. */
    cvmx_write_csr(CVMX_GMXX_RXX_INT_EN(0,interface), 0x0);
    cvmx_write_csr(CVMX_GMXX_TX_INT_EN(interface), 0x0);
    cvmx_write_csr(CVMX_PCSXX_INT_EN_REG(interface), 0x0);

    /* (4) Bring up the PCSX and GMX reconciliation layer. */
    /* (4)a Set polarity and lane swapping. */
    /* (4)b */
    gmxXauiTxCtl.u64 = cvmx_read_csr (CVMX_GMXX_TX_XAUI_CTL(interface));
    gmxXauiTxCtl.s.dic_en = 1; /* Enable better IFG packing and improves performance */
    gmxXauiTxCtl.s.uni_en = 0;
    cvmx_write_csr (CVMX_GMXX_TX_XAUI_CTL(interface), gmxXauiTxCtl.u64);

    /* (4)c Aply reset sequence */
    xauiCtl.u64 = cvmx_read_csr (CVMX_PCSXX_CONTROL1_REG(interface));
    xauiCtl.s.lo_pwr = 0;
    xauiCtl.s.reset  = 1;
    cvmx_write_csr (CVMX_PCSXX_CONTROL1_REG(interface), xauiCtl.u64);

    /* Wait for PCS to come out of reset */
    if (CVMX_WAIT_FOR_FIELD64(CVMX_PCSXX_CONTROL1_REG(interface), cvmx_pcsxx_control1_reg_t, reset, ==, 0, 10000))
        return -1;
    /* Wait for PCS to be aligned */
    if (CVMX_WAIT_FOR_FIELD64(CVMX_PCSXX_10GBX_STATUS_REG(interface), cvmx_pcsxx_10gbx_status_reg_t, alignd, ==, 1, 10000))
        return -1;
    /* Wait for RX to be ready */
    if (CVMX_WAIT_FOR_FIELD64(CVMX_GMXX_RX_XAUI_CTL(interface), cvmx_gmxx_rx_xaui_ctl_t, status, ==, 0, 10000))
        return -1;

    /* (6) Configure GMX */
    gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(0, interface));
    gmx_cfg.s.en = 0;
    cvmx_write_csr(CVMX_GMXX_PRTX_CFG(0, interface), gmx_cfg.u64);

    /* Wait for GMX RX to be idle */
    if (CVMX_WAIT_FOR_FIELD64(CVMX_GMXX_PRTX_CFG(0, interface), cvmx_gmxx_prtx_cfg_t, rx_idle, ==, 1, 10000))
        return -1;
    /* Wait for GMX TX to be idle */
    if (CVMX_WAIT_FOR_FIELD64(CVMX_GMXX_PRTX_CFG(0, interface), cvmx_gmxx_prtx_cfg_t, tx_idle, ==, 1, 10000))
        return -1;

    /* GMX configure */
    gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(0, interface));
    gmx_cfg.s.speed = 1;
    gmx_cfg.s.speed_msb = 0;
    gmx_cfg.s.slottime = 1;
    cvmx_write_csr(CVMX_GMXX_TX_PRTS(interface), 1);
    cvmx_write_csr(CVMX_GMXX_TXX_SLOT(0, interface), 512);
    cvmx_write_csr(CVMX_GMXX_TXX_BURST(0, interface), 8192);
    cvmx_write_csr(CVMX_GMXX_PRTX_CFG(0, interface), gmx_cfg.u64);

    /* Wait for receive link */
    if (CVMX_WAIT_FOR_FIELD64(CVMX_PCSXX_STATUS1_REG(interface), cvmx_pcsxx_status1_reg_t, rcv_lnk, ==, 1, 10000))
        return -1;
    if (CVMX_WAIT_FOR_FIELD64(CVMX_PCSXX_STATUS2_REG(interface), cvmx_pcsxx_status2_reg_t, xmtflt, ==, 0, 10000))
        return -1;
    if (CVMX_WAIT_FOR_FIELD64(CVMX_PCSXX_STATUS2_REG(interface), cvmx_pcsxx_status2_reg_t, rcvflt, ==, 0, 10000))
        return -1;

    /* (8) Enable packet reception */
    xauiMiscCtl.s.gmxeno = 0;
    cvmx_write_csr (CVMX_PCSXX_MISC_CTL_REG(interface), xauiMiscCtl.u64);

    gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(0, interface));
    gmx_cfg.s.en = 1;
    cvmx_write_csr(CVMX_GMXX_PRTX_CFG(0, interface), gmx_cfg.u64);

    link_info = cvmx_helper_link_autoconf(cvmx_helper_get_ipd_port(interface, 0));
    if (!link_info.s.link_up)
        return -1;

    return 0;
}

/**
 * @INTERNAL
 * Return the link state of an IPD/PKO port as returned by
 * auto negotiation. The result of this function may not match
 * Octeon's link config if auto negotiation has changed since
 * the last call to cvmx_helper_link_set().
 *
 * @param ipd_port IPD/PKO port to query
 *
 * @return Link state
 */
cvmx_helper_link_info_t __cvmx_helper_xaui_link_get(int ipd_port)
{
    int interface = cvmx_helper_get_interface_num(ipd_port);
    cvmx_gmxx_tx_xaui_ctl_t gmxx_tx_xaui_ctl;
    cvmx_gmxx_rx_xaui_ctl_t gmxx_rx_xaui_ctl;
    cvmx_pcsxx_status1_reg_t pcsxx_status1_reg;
    cvmx_helper_link_info_t result;

    gmxx_tx_xaui_ctl.u64 = cvmx_read_csr(CVMX_GMXX_TX_XAUI_CTL(interface));
    gmxx_rx_xaui_ctl.u64 = cvmx_read_csr(CVMX_GMXX_RX_XAUI_CTL(interface));
    pcsxx_status1_reg.u64 = cvmx_read_csr(CVMX_PCSXX_STATUS1_REG(interface));
    result.u64 = 0;

    /* Only return a link if both RX and TX are happy */
    if ((gmxx_tx_xaui_ctl.s.ls == 0) && (gmxx_rx_xaui_ctl.s.status == 0) &&
        (pcsxx_status1_reg.s.rcv_lnk == 1))
    {
        result.s.link_up = 1;
        result.s.full_duplex = 1;
        result.s.speed = 10000;
    }
    else
    {
        /* Disable GMX and PCSX interrupts. */
        cvmx_write_csr (CVMX_GMXX_RXX_INT_EN(0,interface), 0x0);
        cvmx_write_csr (CVMX_GMXX_TX_INT_EN(interface), 0x0);
        cvmx_write_csr (CVMX_PCSXX_INT_EN_REG(interface), 0x0);
    }
    return result;
}


/**
 * @INTERNAL
 * Configure an IPD/PKO port for the specified link state. This
 * function does not influence auto negotiation at the PHY level.
 * The passed link state must always match the link state returned
 * by cvmx_helper_link_get(). It is normally best to use
 * cvmx_helper_link_autoconf() instead.
 *
 * @param ipd_port  IPD/PKO port to configure
 * @param link_info The new link state
 *
 * @return Zero on success, negative on failure
 */
int __cvmx_helper_xaui_link_set(int ipd_port, cvmx_helper_link_info_t link_info)
{
    int interface = cvmx_helper_get_interface_num(ipd_port);
    cvmx_gmxx_tx_xaui_ctl_t gmxx_tx_xaui_ctl;
    cvmx_gmxx_rx_xaui_ctl_t gmxx_rx_xaui_ctl;

    gmxx_tx_xaui_ctl.u64 = cvmx_read_csr(CVMX_GMXX_TX_XAUI_CTL(interface));
    gmxx_rx_xaui_ctl.u64 = cvmx_read_csr(CVMX_GMXX_RX_XAUI_CTL(interface));

    /* If the link shouldn't be up, then just return */
    if (!link_info.s.link_up)
        return 0;

    /* Do nothing if both RX and TX are happy */
    if ((gmxx_tx_xaui_ctl.s.ls == 0) && (gmxx_rx_xaui_ctl.s.status == 0))
        return 0;

    /* Bring the link up */
    return __cvmx_helper_xaui_enable(interface);
}


/**
 * @INTERNAL
 * Configure a port for internal and/or external loopback. Internal loopback
 * causes packets sent by the port to be received by Octeon. External loopback
 * causes packets received from the wire to sent out again.
 *
 * @param ipd_port IPD/PKO port to loopback.
 * @param enable_internal
 *                 Non zero if you want internal loopback
 * @param enable_external
 *                 Non zero if you want external loopback
 *
 * @return Zero on success, negative on failure.
 */
extern int __cvmx_helper_xaui_configure_loopback(int ipd_port, int enable_internal, int enable_external)
{
    int interface = cvmx_helper_get_interface_num(ipd_port);
    cvmx_pcsxx_control1_reg_t pcsxx_control1_reg;
    cvmx_gmxx_xaui_ext_loopback_t gmxx_xaui_ext_loopback;

    /* Set the internal loop */
    pcsxx_control1_reg.u64 = cvmx_read_csr(CVMX_PCSXX_CONTROL1_REG(interface));
    pcsxx_control1_reg.s.loopbck1 = enable_internal;
    cvmx_write_csr(CVMX_PCSXX_CONTROL1_REG(interface), pcsxx_control1_reg.u64);

    /* Set the external loop */
    gmxx_xaui_ext_loopback.u64 = cvmx_read_csr(CVMX_GMXX_XAUI_EXT_LOOPBACK(interface));
    gmxx_xaui_ext_loopback.s.en = enable_external;
    cvmx_write_csr(CVMX_GMXX_XAUI_EXT_LOOPBACK(interface), gmxx_xaui_ext_loopback.u64);

    /* Take the link through a reset */
    return __cvmx_helper_xaui_enable(interface);
}

#endif /* CVMX_ENABLE_PKO_FUNCTIONS */