// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2007-2015  STMicroelectronics Ltd
 *
 * Author: Alexandre Torgue <alexandre.torgue@st.com>
 */

#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/delay.h>
#include "common.h"
#include "dwmac4_dma.h"
#include "dwmac4.h"
#include "stmmac.h"

int dwmac4_dma_reset(void __iomem *ioaddr)
{
        u32 value = readl(ioaddr + DMA_BUS_MODE);

        /* DMA SW reset */
        value |= DMA_BUS_MODE_SFT_RESET;
        writel(value, ioaddr + DMA_BUS_MODE);

        return readl_poll_timeout(ioaddr + DMA_BUS_MODE, value,
                                 !(value & DMA_BUS_MODE_SFT_RESET),
                                 10000, 1000000);
}

void dwmac4_set_rx_tail_ptr(struct stmmac_priv *priv, void __iomem *ioaddr,
                            u32 tail_ptr, u32 chan)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;

        writel(tail_ptr, ioaddr + DMA_CHAN_RX_END_ADDR(dwmac4_addrs, chan));
}

void dwmac4_set_tx_tail_ptr(struct stmmac_priv *priv, void __iomem *ioaddr,
                            u32 tail_ptr, u32 chan)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;

        writel(tail_ptr, ioaddr + DMA_CHAN_TX_END_ADDR(dwmac4_addrs, chan));
}

void dwmac4_dma_start_tx(struct stmmac_priv *priv, void __iomem *ioaddr,
                         u32 chan)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
        u32 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));

        value |= DMA_CONTROL_ST;
        writel(value, ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));

        value = readl(ioaddr + GMAC_CONFIG);
        value |= GMAC_CONFIG_TE;
        writel(value, ioaddr + GMAC_CONFIG);
}

void dwmac4_dma_stop_tx(struct stmmac_priv *priv, void __iomem *ioaddr,
                        u32 chan)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;

        u32 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));

        value &= ~DMA_CONTROL_ST;
        writel(value, ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));
}

void dwmac4_dma_start_rx(struct stmmac_priv *priv, void __iomem *ioaddr,
                         u32 chan)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;

        u32 value = readl(ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));

        value |= DMA_CONTROL_SR;

        writel(value, ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));

        value = readl(ioaddr + GMAC_CONFIG);
        value |= GMAC_CONFIG_RE;
        writel(value, ioaddr + GMAC_CONFIG);
}

void dwmac4_dma_stop_rx(struct stmmac_priv *priv, void __iomem *ioaddr,
                        u32 chan)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
        u32 value = readl(ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));

        value &= ~DMA_CONTROL_SR;
        writel(value, ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));
}

void dwmac4_set_tx_ring_len(struct stmmac_priv *priv, void __iomem *ioaddr,
                            u32 len, u32 chan)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;

        writel(len, ioaddr + DMA_CHAN_TX_RING_LEN(dwmac4_addrs, chan));
}

void dwmac4_set_rx_ring_len(struct stmmac_priv *priv, void __iomem *ioaddr,
                            u32 len, u32 chan)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;

        writel(len, ioaddr + DMA_CHAN_RX_RING_LEN(dwmac4_addrs, chan));
}

void dwmac4_enable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
                           u32 chan, bool rx, bool tx)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
        u32 value = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));

        if (rx)
                value |= DMA_CHAN_INTR_DEFAULT_RX;
        if (tx)
                value |= DMA_CHAN_INTR_DEFAULT_TX;

        writel(value, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
}

void dwmac410_enable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
                             u32 chan, bool rx, bool tx)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
        u32 value = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));

        if (rx)
                value |= DMA_CHAN_INTR_DEFAULT_RX_4_10;
        if (tx)
                value |= DMA_CHAN_INTR_DEFAULT_TX_4_10;

        writel(value, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
}

void dwmac4_disable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
                            u32 chan, bool rx, bool tx)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
        u32 value = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));

        if (rx)
                value &= ~DMA_CHAN_INTR_DEFAULT_RX;
        if (tx)
                value &= ~DMA_CHAN_INTR_DEFAULT_TX;

        writel(value, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
}

void dwmac410_disable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
                              u32 chan, bool rx, bool tx)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
        u32 value = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));

        if (rx)
                value &= ~DMA_CHAN_INTR_DEFAULT_RX_4_10;
        if (tx)
                value &= ~DMA_CHAN_INTR_DEFAULT_TX_4_10;

        writel(value, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
}

int dwmac4_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
                         struct stmmac_extra_stats *x, u32 chan, u32 dir)
{
        const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
        u32 intr_status = readl(ioaddr + DMA_CHAN_STATUS(dwmac4_addrs, chan));
        u32 intr_en = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
        struct stmmac_pcpu_stats *stats = this_cpu_ptr(priv->xstats.pcpu_stats);
        int ret = 0;

        if (dir == DMA_DIR_RX)
                intr_status &= DMA_CHAN_STATUS_MSK_RX;
        else if (dir == DMA_DIR_TX)
                intr_status &= DMA_CHAN_STATUS_MSK_TX;

        /* ABNORMAL interrupts */
        if (unlikely(intr_status & DMA_CHAN_STATUS_AIS)) {
                if (unlikely(intr_status & DMA_CHAN_STATUS_RBU))
                        x->rx_buf_unav_irq++;
                if (unlikely(intr_status & DMA_CHAN_STATUS_RPS))
                        x->rx_process_stopped_irq++;
                if (unlikely(intr_status & DMA_CHAN_STATUS_ETI))
                        x->tx_early_irq++;
                if (unlikely(intr_status & DMA_CHAN_STATUS_TPS)) {
                        x->tx_process_stopped_irq++;
                        ret = tx_hard_error;
                }
                if (unlikely(intr_status & DMA_CHAN_STATUS_FBE)) {
                        x->fatal_bus_error_irq++;
                        ret = tx_hard_error;
                }
        }

        if (unlikely(intr_status & DMA_CHAN_STATUS_RWT))
                x->rx_watchdog_irq++;

        /* TX/RX NORMAL interrupts */
        if (likely(intr_status & DMA_CHAN_STATUS_RI)) {
                u64_stats_update_begin(&stats->syncp);
                u64_stats_inc(&stats->rx_normal_irq_n[chan]);
                u64_stats_update_end(&stats->syncp);
                ret |= handle_rx;
        }
        if (likely(intr_status & DMA_CHAN_STATUS_TI)) {
                u64_stats_update_begin(&stats->syncp);
                u64_stats_inc(&stats->tx_normal_irq_n[chan]);
                u64_stats_update_end(&stats->syncp);
                ret |= handle_tx;
        }

        if (unlikely(intr_status & DMA_CHAN_STATUS_TBU))
                ret |= handle_tx;
        if (unlikely(intr_status & DMA_CHAN_STATUS_ERI))
                x->rx_early_irq++;

        writel(intr_status & intr_en,
               ioaddr + DMA_CHAN_STATUS(dwmac4_addrs, chan));
        return ret;
}

void stmmac_dwmac4_set_mac_addr(void __iomem *ioaddr, const u8 addr[6],
                                unsigned int high, unsigned int low)
{
        unsigned long data;

        data = (addr[5] << 8) | addr[4];
        /* For MAC Addr registers se have to set the Address Enable (AE)
         * bit that has no effect on the High Reg 0 where the bit 31 (MO)
         * is RO.
         */
        data |= FIELD_PREP(GMAC_HI_DCS, STMMAC_CHAN0);
        writel(data | GMAC_HI_REG_AE, ioaddr + high);
        data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
        writel(data, ioaddr + low);
}

/* Enable disable MAC RX/TX */
void stmmac_dwmac4_set_mac(void __iomem *ioaddr, bool enable)
{
        u32 value = readl(ioaddr + GMAC_CONFIG);
        u32 old_val = value;

        if (enable)
                value |= GMAC_CONFIG_RE | GMAC_CONFIG_TE;
        else
                value &= ~(GMAC_CONFIG_TE | GMAC_CONFIG_RE);

        if (value != old_val)
                writel(value, ioaddr + GMAC_CONFIG);
}

void stmmac_dwmac4_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
                                unsigned int high, unsigned int low)
{
        unsigned int hi_addr, lo_addr;

        /* Read the MAC address from the hardware */
        hi_addr = readl(ioaddr + high);
        lo_addr = readl(ioaddr + low);

        /* Extract the MAC address from the high and low words */
        addr[0] = lo_addr & 0xff;
        addr[1] = (lo_addr >> 8) & 0xff;
        addr[2] = (lo_addr >> 16) & 0xff;
        addr[3] = (lo_addr >> 24) & 0xff;
        addr[4] = hi_addr & 0xff;
        addr[5] = (hi_addr >> 8) & 0xff;
}