/*
   Copyright (c) 2016 Broadcom Corporation
   All Rights Reserved

    <:label-BRCM:2016: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.
    
:>
*/

/*
 *  Created on: Aug 2016
 *      Author: yuval.raviv@broadcom.com
 */

/*
 * Phy driver for 6836 SGMII/HSGMII
 */

#include "bus_drv.h"
#include "phy_drv.h"
#include "phy_drv_mii.h"
#include "phy_drv_sgmii_plus2.h"
#include "pmc_drv.h"
#include "access_macros.h"
#include "bcm_map_part.h"

#define SGMII_CTRL      SGMII_BASE + 0x0004
#define SGMII_STAT      SGMII_BASE + 0x0008

static uint32_t phy_addr;

#pragma pack(push,1)
typedef struct
{
    uint32_t IDDQ:1;
    uint32_t PWRDWN:1;
    uint32_t Reserved0:1;
    uint32_t RESET_PLL:1;
    uint32_t RESET_MDIOREGS:1;
    uint32_t SERDES_RESET:1;
    uint32_t Reserved1:2;
    uint32_t SERDES_PRTAD:5;
    uint32_t SERDES_DEVAD:5;
    uint32_t MDIO_ST:1;
    uint32_t SERDES_TEST_EN:1;
    uint32_t LINK_DOWN_TX_DIS:1;
    uint32_t SERDES_PRTAD_BCST:5;
    uint32_t Reserved2:6;
} sgmii_ctrl_t;
#pragma pack(pop)

#pragma pack(push,1)
typedef struct
{
    uint32_t LINK_STATUS:1;
    uint32_t RX_SIGDET:1;
    uint32_t RXSEQDONE1G:1;
    uint32_t SGMII:1;
    uint32_t SYNC_STATUS:1;
    uint32_t PLL_LOCK:1;
    uint32_t DEB_SIG_DETECT:1;
    uint32_t APD_STATE:3;
    uint32_t Reserved:22;
} sgmii_stat_t;
#pragma pack(pop)

static int _phy_speed_set(phy_dev_t *phy_dev, phy_speed_t speed, phy_duplex_t duplex)
{
    int ret;

    if ((ret = sgmii_speed_set(phy_dev, speed)))
        goto Exit;

    phy_dev_read_status(phy_dev);

Exit:
    return ret;
}

static int _phy_init(phy_dev_t *phy_dev)
{
    int ret;

    if ((ret = sgmii_init(phy_dev)))
        return ret;

    return 0;
}

static int sgmii_bpcm_init(void)
{
    uint32_t data;

    ReadBPCMRegister(PMB_ADDR_WAN, 0x10, &data);
    data |= (1 << 5); // sgmii_z2_serdes_reset_n
    WriteBPCMRegister(PMB_ADDR_WAN, 0x10, data);

    return 0;
}

static void sgmii_ctrl_init(void)
{
    sgmii_ctrl_t sgmii_ctrl;

    sgmii_ctrl.SERDES_PRTAD = phy_addr;
    WRITE_32(SGMII_CTRL, sgmii_ctrl);
    udelay(1000);

    READ_32(SGMII_CTRL, sgmii_ctrl);
    sgmii_ctrl.RESET_PLL = 1;
    sgmii_ctrl.RESET_MDIOREGS = 1;
    sgmii_ctrl.SERDES_RESET = 1;
    sgmii_ctrl.IDDQ = 0;
    sgmii_ctrl.PWRDWN = 0;
    WRITE_32(SGMII_CTRL, sgmii_ctrl);
    udelay(1000);

    sgmii_ctrl.RESET_PLL = 0;
    sgmii_ctrl.RESET_MDIOREGS = 0;
    sgmii_ctrl.SERDES_RESET = 0;
    WRITE_32(SGMII_CTRL, sgmii_ctrl);
    udelay(1000);
}

static void wait_for_pll_lock(void)
{
    uint32_t retry = 20;
    sgmii_stat_t sgmii_stat;

    do {
        READ_32(SGMII_STAT, sgmii_stat);
        if (sgmii_stat.PLL_LOCK)
            break;
        udelay(1000);
    } while (--retry);

    if (!retry)
        printk("SGMII Error: wait_for_pll_lock() reached maximum retries\n");
    else
        printk("SGMII PLL locked\n");
}

static int sgmii_cfg(void)
{
    sgmii_bpcm_init();
    sgmii_ctrl_init();
    wait_for_pll_lock();

    return 0;
}

static int _phy_dev_add(phy_dev_t *phy_dev)
{
    phy_addr = phy_dev->addr;

    return 0;
}

static int _phy_dev_del(phy_dev_t *phy_dev)
{
    phy_addr = 0;

    return 0;
}

static int _phy_drv_init(phy_drv_t *phy_drv)
{
    if (phy_addr && sgmii_cfg())
    {
        printk("Failed to initialize the sgmii driver\n");
        return -1;
    }

    phy_drv->initialized = 1;

    return 0;
}

phy_drv_t phy_drv_6836_sgmii =
{
    .phy_type = PHY_TYPE_6836_SGMII,
    .name = "SGMII",
    .read = sgmii_read,
    .write = sgmii_write,
    .power_set = mii_power_set,
    .read_status = sgmii_read_status,
    .speed_set = _phy_speed_set,
    .phyid_get = mii_phyid_get,
    .init = _phy_init,
    .dev_add = _phy_dev_add,
    .dev_del = _phy_dev_del,
    .drv_init = _phy_drv_init,
};