/*
    Copyright 2016 Broadcom Corporation

    <:label-BRCM:2015:DUAL/GPL:standard
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2, as published by
    the Free Software Foundation (the "GPL").
    
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    
    
    A copy of the GPL is available at http://www.broadcom.com/licenses/GPLv2.php, or by
    writing to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.
    
    :>
*/

#include <wan_drv.h>
#include "bcm_ext_timer.h"
#include "bl_os_wraper.h"
#include <linux/spinlock.h>
#include <linux/jiffies.h>

static pon_serdes_lof_fixup_fifo_t fifo_cb;
static pon_serdes_lof_fixup_reset_cdr_t reset_cdr;
static void (*pmd_rx_restart)(void);
static void (*reset_rx_fifo)(void);
static void (*reset_tx_fifo)(void);
static void (*reset_gb)(void);
static int state_tracking, is_init = TRUE, sd_timer_id = -1;
DEFINE_SPINLOCK(state_lock);
#define STATE_NO_SYNC   0
#define STATE_SYNC      1
#define STATE_JUST_SYNC 2

#if defined (CONFIG_BCM96848)
#define ASAP 10
#else
#define ASAP 1
#endif

static void restart_sd_timer(int now)
{
    ext_timer_set_period(sd_timer_id, now ? ASAP : 1000*1000);
    ext_timer_start(sd_timer_id);
}

static void fixup_func(unsigned long data)
{
    int current_state_tracking;
    static uint64_t prev_stamp; /* time of previous sync */
    const uint64_t  now_stamp = jiffies;
    const uint64_t  gap_stamp = now_stamp - prev_stamp; /* time since last sync */

    spin_lock(&state_lock);
    current_state_tracking = state_tracking;
    if (state_tracking == STATE_JUST_SYNC)
        state_tracking = STATE_SYNC;
    spin_unlock(&state_lock);

    if (fifo_cb.reset_fifo && is_init && current_state_tracking)
    {
        is_init = FALSE;
        fifo_cb.reset_fifo();
    }
    else if (current_state_tracking)
    {
        if (fifo_cb.gearbox_drift_test && fifo_cb.gearbox_drift_test(current_state_tracking == STATE_JUST_SYNC))
            fifo_cb.reset_fifo();
        if (current_state_tracking == STATE_JUST_SYNC)
        {
            prev_stamp = now_stamp;
            if (gap_stamp > msecs_to_jiffies(100))
            {
                wd_log_debug("\nJUST_SYNC");
                /* if (pmd_rx_restart)
                {
                    (*pmd_rx_restart)();
                    wd_log_debug("\nJUST_SYNC");
                    mdelay(10);
                }
                if (reset_rx_fifo)
                {
                    (*reset_rx_fifo)();
                    mdelay(50); // wait to recover from reset_rx_fifo before reset_tx_fifo
                }
                if (reset_tx_fifo)
                    (*reset_tx_fifo)(); */
                if (reset_gb)
                {
                    mdelay(20); /* wait for sync to be processed before reset_gb */
                    (*reset_gb)();
                }
            }
            else
                wd_log_debug("\nIGNORING JUST_SYNC");
        }
    }
    else
    {
        if (gap_stamp > msecs_to_jiffies(100))
        {
            wd_log_debug("\nDISC");
               /* if (pmd_rx_restart)
                (*pmd_rx_restart)(); */
            if (reset_cdr)
                (*reset_cdr)();
        }
        else
            wd_log_debug("\nIGNORING DISC");
    }

    restart_sd_timer(0);
}

DECLARE_TASKLET(fixup_tasklet, fixup_func, (unsigned long)0);

static void sd_timer_callback(unsigned long xi_user_params_ptr)
{
    tasklet_hi_schedule(&fixup_tasklet);
}

void pon_serdes_lof_fixup_irq(int lof)
{
    if (sd_timer_id == -1)
        return;

    spin_lock(&state_lock);
    ext_timer_stop(sd_timer_id);
    state_tracking = lof ? STATE_NO_SYNC : STATE_JUST_SYNC;

    wd_log_debug("LOF interrupt clear: %d\n", state_tracking);

    if (fifo_cb.reset_fifo && state_tracking)
        tasklet_hi_schedule(&fixup_tasklet);
    else
        restart_sd_timer(1);
    spin_unlock(&state_lock);
}
EXPORT_SYMBOL(pon_serdes_lof_fixup_irq);

int pon_serdes_lof_fixup_cfg(pon_serdes_lof_fixup_fifo_t *_fifo_cb, pon_serdes_lof_fixup_reset_cdr_t reset_cb, void (*pmd_rx_restart_cb)(void), void (*reset_rx_fifo_cb)(void), void (*reset_tx_fifo_cb)(void), void (*reset_gb_cb)(void))
{
    if (_fifo_cb)
        fifo_cb = *_fifo_cb;
    reset_cdr = reset_cb;
    pmd_rx_restart = pmd_rx_restart_cb;
    reset_rx_fifo = reset_rx_fifo_cb;
    reset_tx_fifo = reset_tx_fifo_cb;
    reset_gb = reset_gb_cb;

    if (sd_timer_id != -1)
        return 0;

    sd_timer_id = ext_timer_alloc_only(-1, &sd_timer_callback, 0);
    if (sd_timer_id < 0)
    {
        wd_log("wan_drv: failed to allocate timer\n");
        return -1;
    }

    restart_sd_timer(0);

    return 0;
}
EXPORT_SYMBOL(pon_serdes_lof_fixup_cfg);