// SPDX-License-Identifier: GPL-2.0-only
/*******************************************************************************
  This is the driver for the MAC 10/100 on-chip Ethernet controller
  currently tested on all the ST boards based on STb7109 and stx7200 SoCs.

  DWC Ether MAC 10/100 Universal version 4.0 has been used for developing
  this code.

  This only implements the mac core functions for this chip.

  Copyright (C) 2007-2009  STMicroelectronics Ltd


  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
*******************************************************************************/

#include <linux/crc32.h>
#include <linux/io.h>
#include "stmmac.h"
#include "dwmac100.h"

static void dwmac100_core_init(struct mac_device_info *hw,
                               struct net_device *dev)
{
        void __iomem *ioaddr = hw->pcsr;
        u32 value = readl(ioaddr + MAC_CONTROL);

        value |= MAC_CORE_INIT;

        writel(value, ioaddr + MAC_CONTROL);

#ifdef STMMAC_VLAN_TAG_USED
        writel(ETH_P_8021Q, ioaddr + MAC_VLAN1);
#endif
}

static void dwmac100_dump_mac_regs(struct mac_device_info *hw, u32 *reg_space)
{
        void __iomem *ioaddr = hw->pcsr;

        reg_space[MAC_CONTROL / 4] = readl(ioaddr + MAC_CONTROL);
        reg_space[MAC_ADDR_HIGH / 4] = readl(ioaddr + MAC_ADDR_HIGH);
        reg_space[MAC_ADDR_LOW / 4] = readl(ioaddr + MAC_ADDR_LOW);
        reg_space[MAC_HASH_HIGH / 4] = readl(ioaddr + MAC_HASH_HIGH);
        reg_space[MAC_HASH_LOW / 4] = readl(ioaddr + MAC_HASH_LOW);
        reg_space[MAC_FLOW_CTRL / 4] = readl(ioaddr + MAC_FLOW_CTRL);
        reg_space[MAC_VLAN1 / 4] = readl(ioaddr + MAC_VLAN1);
        reg_space[MAC_VLAN2 / 4] = readl(ioaddr + MAC_VLAN2);
}

static int dwmac100_rx_ipc_enable(struct mac_device_info *hw)
{
        return 0;
}

static int dwmac100_irq_status(struct stmmac_priv *priv,
                               struct stmmac_extra_stats *x)
{
        return 0;
}

static void dwmac100_set_umac_addr(struct mac_device_info *hw,
                                   const unsigned char *addr,
                                   unsigned int reg_n)
{
        void __iomem *ioaddr = hw->pcsr;
        stmmac_set_mac_addr(ioaddr, addr, MAC_ADDR_HIGH, MAC_ADDR_LOW);
}

static void dwmac100_get_umac_addr(struct mac_device_info *hw,
                                   unsigned char *addr,
                                   unsigned int reg_n)
{
        void __iomem *ioaddr = hw->pcsr;
        stmmac_get_mac_addr(ioaddr, addr, MAC_ADDR_HIGH, MAC_ADDR_LOW);
}

static void dwmac100_set_filter(struct mac_device_info *hw,
                                struct net_device *dev)
{
        void __iomem *ioaddr = (void __iomem *)dev->base_addr;
        u32 value = readl(ioaddr + MAC_CONTROL);

        if (dev->flags & IFF_PROMISC) {
                value |= MAC_CONTROL_PR;
                value &= ~(MAC_CONTROL_PM | MAC_CONTROL_IF | MAC_CONTROL_HO |
                           MAC_CONTROL_HP);
        } else if ((netdev_mc_count(dev) > HASH_TABLE_SIZE)
                   || (dev->flags & IFF_ALLMULTI)) {
                value |= MAC_CONTROL_PM;
                value &= ~(MAC_CONTROL_PR | MAC_CONTROL_IF | MAC_CONTROL_HO);
                writel(0xffffffff, ioaddr + MAC_HASH_HIGH);
                writel(0xffffffff, ioaddr + MAC_HASH_LOW);
        } else if (netdev_mc_empty(dev)) {      /* no multicast */
                value &= ~(MAC_CONTROL_PM | MAC_CONTROL_PR | MAC_CONTROL_IF |
                           MAC_CONTROL_HO | MAC_CONTROL_HP);
        } else {
                u32 mc_filter[2];
                struct netdev_hw_addr *ha;

                /* Perfect filter mode for physical address and Hash
                 * filter for multicast
                 */
                value |= MAC_CONTROL_HP;
                value &= ~(MAC_CONTROL_PM | MAC_CONTROL_PR |
                           MAC_CONTROL_IF | MAC_CONTROL_HO);

                memset(mc_filter, 0, sizeof(mc_filter));
                netdev_for_each_mc_addr(ha, dev) {
                        /* The upper 6 bits of the calculated CRC are used to
                         * index the contents of the hash table
                         */
                        int bit_nr = ether_crc(ETH_ALEN, ha->addr) >> 26;
                        /* The most significant bit determines the register to
                         * use (H/L) while the other 5 bits determine the bit
                         * within the register.
                         */
                        mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
                }
                writel(mc_filter[0], ioaddr + MAC_HASH_LOW);
                writel(mc_filter[1], ioaddr + MAC_HASH_HIGH);
        }

        writel(value, ioaddr + MAC_CONTROL);
}

static void dwmac100_flow_ctrl(struct mac_device_info *hw, unsigned int duplex,
                               unsigned int fc, unsigned int pause_time,
                               u32 tx_cnt)
{
        void __iomem *ioaddr = hw->pcsr;
        unsigned int flow = MAC_FLOW_CTRL_ENABLE;

        if (duplex)
                flow |= FIELD_PREP(MAC_FLOW_CTRL_PT_MASK, pause_time);
        writel(flow, ioaddr + MAC_FLOW_CTRL);
}

/* No PMT module supported on ST boards with this Eth chip. */
static void dwmac100_pmt(struct mac_device_info *hw, unsigned long mode)
{
        return;
}

static void dwmac100_set_mac_loopback(void __iomem *ioaddr, bool enable)
{
        u32 value = readl(ioaddr + MAC_CONTROL);

        if (enable)
                value |= MAC_CONTROL_OM;
        else
                value &= ~MAC_CONTROL_OM;

        writel(value, ioaddr + MAC_CONTROL);
}

const struct stmmac_ops dwmac100_ops = {
        .core_init = dwmac100_core_init,
        .set_mac = stmmac_set_mac,
        .rx_ipc = dwmac100_rx_ipc_enable,
        .dump_regs = dwmac100_dump_mac_regs,
        .host_irq_status = dwmac100_irq_status,
        .set_filter = dwmac100_set_filter,
        .flow_ctrl = dwmac100_flow_ctrl,
        .pmt = dwmac100_pmt,
        .set_umac_addr = dwmac100_set_umac_addr,
        .get_umac_addr = dwmac100_get_umac_addr,
        .set_mac_loopback = dwmac100_set_mac_loopback,
};

int dwmac100_setup(struct stmmac_priv *priv)
{
        struct mac_device_info *mac = priv->hw;

        dev_info(priv->device, "\tDWMAC100\n");

        mac->pcsr = priv->ioaddr;
        mac->link.caps = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
                         MAC_10 | MAC_100;
        mac->link.duplex = MAC_CONTROL_F;
        mac->link.speed10 = 0;
        mac->link.speed100 = 0;
        mac->link.speed1000 = 0;
        mac->link.speed_mask = MAC_CONTROL_PS;
        mac->mii.addr = MAC_MII_ADDR;
        mac->mii.data = MAC_MII_DATA;
        mac->mii.addr_shift = 11;
        mac->mii.addr_mask = 0x0000F800;
        mac->mii.reg_shift = 6;
        mac->mii.reg_mask = 0x000007C0;
        mac->mii.clk_csr_shift = 2;
        mac->mii.clk_csr_mask = GENMASK(5, 2);

        return 0;
}