/* 10G controller driver for Samsung SoCs
 *
 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * Author: Siva Reddy Kallam <siva.kallam@samsung.com>
 *
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/io.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/jiffies.h>

#include "sxgbe_mtl.h"
#include "sxgbe_reg.h"

static void sxgbe_mtl_init(void __iomem *ioaddr, unsigned int etsalg,
			   unsigned int raa)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_OP_MODE_REG);
	reg_val &= ETS_RST;

	/* ETS Algorith */
	switch (etsalg & SXGBE_MTL_OPMODE_ESTMASK) {
	case ETS_WRR:
		reg_val &= ETS_WRR;
		break;
	case ETS_WFQ:
		reg_val |= ETS_WFQ;
		break;
	case ETS_DWRR:
		reg_val |= ETS_DWRR;
		break;
	}
	writel(reg_val, ioaddr + SXGBE_MTL_OP_MODE_REG);

	switch (raa & SXGBE_MTL_OPMODE_RAAMASK) {
	case RAA_SP:
		reg_val &= RAA_SP;
		break;
	case RAA_WSP:
		reg_val |= RAA_WSP;
		break;
	}
	writel(reg_val, ioaddr + SXGBE_MTL_OP_MODE_REG);
}

/* For Dynamic DMA channel mapping for Rx queue */
static void sxgbe_mtl_dma_dm_rxqueue(void __iomem *ioaddr)
{
	writel(RX_QUEUE_DYNAMIC, ioaddr + SXGBE_MTL_RXQ_DMAMAP0_REG);
	writel(RX_QUEUE_DYNAMIC, ioaddr + SXGBE_MTL_RXQ_DMAMAP1_REG);
	writel(RX_QUEUE_DYNAMIC, ioaddr + SXGBE_MTL_RXQ_DMAMAP2_REG);
}

static void sxgbe_mtl_set_txfifosize(void __iomem *ioaddr, int queue_num,
				     int queue_fifo)
{
	u32 fifo_bits, reg_val;

	/* 0 means 256 bytes */
	fifo_bits = (queue_fifo / SXGBE_MTL_TX_FIFO_DIV) - 1;
	reg_val = readl(ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
	reg_val |= (fifo_bits << SXGBE_MTL_FIFO_LSHIFT);
	writel(reg_val, ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
}

static void sxgbe_mtl_set_rxfifosize(void __iomem *ioaddr, int queue_num,
				     int queue_fifo)
{
	u32 fifo_bits, reg_val;

	/* 0 means 256 bytes */
	fifo_bits = (queue_fifo / SXGBE_MTL_RX_FIFO_DIV)-1;
	reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
	reg_val |= (fifo_bits << SXGBE_MTL_FIFO_LSHIFT);
	writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
}

static void sxgbe_mtl_enable_txqueue(void __iomem *ioaddr, int queue_num)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
	reg_val |= SXGBE_MTL_ENABLE_QUEUE;
	writel(reg_val, ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
}

static void sxgbe_mtl_disable_txqueue(void __iomem *ioaddr, int queue_num)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
	reg_val &= ~SXGBE_MTL_ENABLE_QUEUE;
	writel(reg_val, ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
}

static void sxgbe_mtl_fc_active(void __iomem *ioaddr, int queue_num,
				int threshold)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
	reg_val &= ~(SXGBE_MTL_FCMASK << RX_FC_ACTIVE);
	reg_val |= (threshold << RX_FC_ACTIVE);

	writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
}

static void sxgbe_mtl_fc_enable(void __iomem *ioaddr, int queue_num)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
	reg_val |= SXGBE_MTL_ENABLE_FC;
	writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
}

static void sxgbe_mtl_fc_deactive(void __iomem *ioaddr, int queue_num,
				  int threshold)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
	reg_val &= ~(SXGBE_MTL_FCMASK << RX_FC_DEACTIVE);
	reg_val |= (threshold << RX_FC_DEACTIVE);

	writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
}

static void sxgbe_mtl_fep_enable(void __iomem *ioaddr, int queue_num)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
	reg_val |= SXGBE_MTL_RXQ_OP_FEP;

	writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
}

static void sxgbe_mtl_fep_disable(void __iomem *ioaddr, int queue_num)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
	reg_val &= ~(SXGBE_MTL_RXQ_OP_FEP);

	writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
}

static void sxgbe_mtl_fup_enable(void __iomem *ioaddr, int queue_num)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
	reg_val |= SXGBE_MTL_RXQ_OP_FUP;

	writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
}

static void sxgbe_mtl_fup_disable(void __iomem *ioaddr, int queue_num)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
	reg_val &= ~(SXGBE_MTL_RXQ_OP_FUP);

	writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
}


static void sxgbe_set_tx_mtl_mode(void __iomem *ioaddr, int queue_num,
				  int tx_mode)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
	/* TX specific MTL mode settings */
	if (tx_mode == SXGBE_MTL_SFMODE) {
		reg_val |= SXGBE_MTL_SFMODE;
	} else {
		/* set the TTC values */
		if (tx_mode <= 64)
			reg_val |= MTL_CONTROL_TTC_64;
		else if (tx_mode <= 96)
			reg_val |= MTL_CONTROL_TTC_96;
		else if (tx_mode <= 128)
			reg_val |= MTL_CONTROL_TTC_128;
		else if (tx_mode <= 192)
			reg_val |= MTL_CONTROL_TTC_192;
		else if (tx_mode <= 256)
			reg_val |= MTL_CONTROL_TTC_256;
		else if (tx_mode <= 384)
			reg_val |= MTL_CONTROL_TTC_384;
		else
			reg_val |= MTL_CONTROL_TTC_512;
	}

	/* write into TXQ operation register */
	writel(reg_val, ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
}

static void sxgbe_set_rx_mtl_mode(void __iomem *ioaddr, int queue_num,
				  int rx_mode)
{
	u32 reg_val;

	reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
	/* RX specific MTL mode settings */
	if (rx_mode == SXGBE_RX_MTL_SFMODE) {
		reg_val |= SXGBE_RX_MTL_SFMODE;
	} else {
		if (rx_mode <= 64)
			reg_val |= MTL_CONTROL_RTC_64;
		else if (rx_mode <= 96)
			reg_val |= MTL_CONTROL_RTC_96;
		else if (rx_mode <= 128)
			reg_val |= MTL_CONTROL_RTC_128;
	}

	/* write into RXQ operation register */
	writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
}

static const struct sxgbe_mtl_ops mtl_ops = {
	.mtl_set_txfifosize		= sxgbe_mtl_set_txfifosize,
	.mtl_set_rxfifosize		= sxgbe_mtl_set_rxfifosize,
	.mtl_enable_txqueue		= sxgbe_mtl_enable_txqueue,
	.mtl_disable_txqueue		= sxgbe_mtl_disable_txqueue,
	.mtl_dynamic_dma_rxqueue	= sxgbe_mtl_dma_dm_rxqueue,
	.set_tx_mtl_mode		= sxgbe_set_tx_mtl_mode,
	.set_rx_mtl_mode		= sxgbe_set_rx_mtl_mode,
	.mtl_init			= sxgbe_mtl_init,
	.mtl_fc_active			= sxgbe_mtl_fc_active,
	.mtl_fc_deactive		= sxgbe_mtl_fc_deactive,
	.mtl_fc_enable			= sxgbe_mtl_fc_enable,
	.mtl_fep_enable			= sxgbe_mtl_fep_enable,
	.mtl_fep_disable		= sxgbe_mtl_fep_disable,
	.mtl_fup_enable			= sxgbe_mtl_fup_enable,
	.mtl_fup_disable		= sxgbe_mtl_fup_disable
};

const struct sxgbe_mtl_ops *sxgbe_get_mtl_ops(void)
{
	return &mtl_ops;
}