/*
 * TC956X ethernet driver.
 *
 * tc956x_vf_rsc_mng.c
 *
 * Copyright (C) 2021 Toshiba Electronic Devices & Storage Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

/*! History:
 *  04 Jun 2020 : Initial Version
 *  VERSION     : 00-01
 *
 *  30 Nov 2021 : Base lined for SRIOV
 *  VERSION     : 01-02
 */

#include "tc956x_vf_rsc_mng.h"
#include "tc956xmac.h"


/**
 * tc956x_vf_rsc_mng_init
 *
 * \brief API to initialise resource manager parameters
 *
 * \details This function initialise parameters used for resource manager
 * control.
 *
 * \param[in] ndev - Pointer to device structure
 *
 * \return None
 */

static int tc956x_vf_rsc_mng_init(struct tc956xmac_priv *priv, struct net_device *ndev)
{
	return 0;
}

/**
 * tc956x_vf_rsc_mng_get_fn_id
 *
 * \brief API to get function ID of this function
 *
 * \details This function is called to get the function ID from
 * the resource manager function ID register
 *
 * \param[in] dev - Pointer to device structure
 * \param[in] fn_id_info - Pointer to function id info structure
 *
 * \return success or error
 */

int tc956x_vf_rsc_mng_get_fn_id(struct tc956xmac_priv *priv, void __iomem *reg_pci_bridge_config_addr,
				       struct fn_id *fn_id_info)
{
	void __iomem *ioaddr = reg_pci_bridge_config_addr;
	u32 rsc_mng_id = readl(ioaddr + RSCMNG_ID_REG);

	fn_id_info->fn_type = (rsc_mng_id & RSC_MNG_FN_TYPE) >> 16;
	fn_id_info->pf_no = (rsc_mng_id & RSC_MNG_PF_FN_NUM);
	fn_id_info->vf_no = ((rsc_mng_id & RSC_MNG_VF_FN_NUM) >> 8);

	/** Below error check for VF driver.
	 * In case of VF driver, function type to be 1
	 */
	if (fn_id_info->fn_type == 0)
		return -1;

	/* VF1,2,3 are supported */
	if (fn_id_info->vf_no > 3)
		return -1;

	/* PF 0 and 1 are supported */
	if (fn_id_info->pf_no > 1)
		return -1;

	return 0;
}

/**
 * tc956x_vf_rsc_mng_get_rscs
 *
 * \brief API to get the DMA channel resources allocated
 *
 * \details This function is used to get the resources (DMA channels)
 * allocated for this function
 *
 * \param[in] dev - Pointer to device structure
 * \param[in] rscs - Pointer to return DMA channel bit pattern in
 * order <7,6,5,4,3,2,1,0>
 * \return None
 */

static void tc956x_vf_rsc_mng_get_rscs(struct tc956xmac_priv *priv, struct net_device *dev, u8 *rscs)
{
	void __iomem *ioaddr = (void __iomem *)priv->tc956x_BRIDGE_CFG_pci_base_addr;
	*rscs = ((readl(ioaddr + RSCMNG_RSC_ST_REG)) & RSC_MNG_RSC_STATUS_MASK);
}

const struct mac_rsc_mng_ops tc956xmac_rsc_mng_ops = {
	.init = tc956x_vf_rsc_mng_init,
	.get_fn_id = tc956x_vf_rsc_mng_get_fn_id,
	.set_rscs = NULL, /* Not applicable for VF */
	.get_rscs = tc956x_vf_rsc_mng_get_rscs,
};