// SPDX-License-Identifier: GPL-2.0
/* Copyright (c)  2018 Intel Corporation */

#include <linux/delay.h>

#include "igc_hw.h"
#include "igc_i225.h"
#include "igc_mac.h"
#include "igc_base.h"
#include "igc.h"

/**
 * igc_reset_hw_base - Reset hardware
 * @hw: pointer to the HW structure
 *
 * This resets the hardware into a known state.  This is a
 * function pointer entry point called by the api module.
 */
static s32 igc_reset_hw_base(struct igc_hw *hw)
{
        s32 ret_val;
        u32 ctrl;

        /* Prevent the PCI-E bus from sticking if there is no TLP connection
         * on the last TLP read/write transaction when MAC is reset.
         */
        ret_val = igc_disable_pcie_master(hw);
        if (ret_val)
                hw_dbg("PCI-E Master disable polling has failed\n");

        hw_dbg("Masking off all interrupts\n");
        wr32(IGC_IMC, 0xffffffff);

        wr32(IGC_RCTL, 0);
        wr32(IGC_TCTL, IGC_TCTL_PSP);
        wrfl();

        usleep_range(10000, 20000);

        ctrl = rd32(IGC_CTRL);

        hw_dbg("Issuing a global reset to MAC\n");
        wr32(IGC_CTRL, ctrl | IGC_CTRL_RST);

        ret_val = igc_get_auto_rd_done(hw);
        if (ret_val) {
                /* When auto config read does not complete, do not
                 * return with an error. This can happen in situations
                 * where there is no eeprom and prevents getting link.
                 */
                hw_dbg("Auto Read Done did not complete\n");
        }

        /* Clear any pending interrupt events. */
        wr32(IGC_IMC, 0xffffffff);
        rd32(IGC_ICR);

        return ret_val;
}

/**
 * igc_init_nvm_params_base - Init NVM func ptrs.
 * @hw: pointer to the HW structure
 */
static s32 igc_init_nvm_params_base(struct igc_hw *hw)
{
        struct igc_nvm_info *nvm = &hw->nvm;
        u32 eecd = rd32(IGC_EECD);
        u16 size;

        /* failed to read reg and got all F's */
        if (!(~eecd))
                return -ENXIO;

        size = FIELD_GET(IGC_EECD_SIZE_EX_MASK, eecd);

        /* Added to a constant, "size" becomes the left-shift value
         * for setting word_size.
         */
        size += NVM_WORD_SIZE_BASE_SHIFT;

        /* Just in case size is out of range, cap it to the largest
         * EEPROM size supported
         */
        if (size > 15)
                size = 15;

        nvm->type = igc_nvm_eeprom_spi;
        nvm->word_size = BIT(size);
        nvm->opcode_bits = 8;
        nvm->delay_usec = 1;

        nvm->page_size = eecd & IGC_EECD_ADDR_BITS ? 32 : 8;
        nvm->address_bits = eecd & IGC_EECD_ADDR_BITS ?
                            16 : 8;

        if (nvm->word_size == BIT(15))
                nvm->page_size = 128;

        return 0;
}

/**
 * igc_setup_copper_link_base - Configure copper link settings
 * @hw: pointer to the HW structure
 *
 * Configures the link for auto-neg or forced speed and duplex.  Then we check
 * for link, once link is established calls to configure collision distance
 * and flow control are called.
 */
static s32 igc_setup_copper_link_base(struct igc_hw *hw)
{
        s32  ret_val = 0;
        u32 ctrl;

        ctrl = rd32(IGC_CTRL);
        ctrl |= IGC_CTRL_SLU;
        ctrl &= ~(IGC_CTRL_FRCSPD | IGC_CTRL_FRCDPX);
        wr32(IGC_CTRL, ctrl);

        ret_val = igc_setup_copper_link(hw);

        return ret_val;
}

/**
 * igc_init_mac_params_base - Init MAC func ptrs.
 * @hw: pointer to the HW structure
 */
static s32 igc_init_mac_params_base(struct igc_hw *hw)
{
        struct igc_dev_spec_base *dev_spec = &hw->dev_spec._base;
        struct igc_mac_info *mac = &hw->mac;

        /* Set mta register count */
        mac->mta_reg_count = 128;
        mac->rar_entry_count = IGC_RAR_ENTRIES;

        /* reset */
        mac->ops.reset_hw = igc_reset_hw_base;

        mac->ops.acquire_swfw_sync = igc_acquire_swfw_sync_i225;
        mac->ops.release_swfw_sync = igc_release_swfw_sync_i225;

        /* Allow a single clear of the SW semaphore on I225 */
        if (mac->type == igc_i225)
                dev_spec->clear_semaphore_once = true;

        /* physical interface link setup */
        mac->ops.setup_physical_interface = igc_setup_copper_link_base;

        return 0;
}

/**
 * igc_init_phy_params_base - Init PHY func ptrs.
 * @hw: pointer to the HW structure
 */
static s32 igc_init_phy_params_base(struct igc_hw *hw)
{
        struct igc_phy_info *phy = &hw->phy;
        s32 ret_val = 0;

        phy->autoneg_mask       = AUTONEG_ADVERTISE_SPEED_DEFAULT_2500;
        phy->reset_delay_us     = 100;

        /* set lan id */
        hw->bus.func = FIELD_GET(IGC_STATUS_FUNC_MASK, rd32(IGC_STATUS));

        /* Make sure the PHY is in a good state. Several people have reported
         * firmware leaving the PHY's page select register set to something
         * other than the default of zero, which causes the PHY ID read to
         * access something other than the intended register.
         */
        ret_val = hw->phy.ops.reset(hw);
        if (ret_val) {
                hw_dbg("Error resetting the PHY\n");
                goto out;
        }

        ret_val = igc_get_phy_id(hw);
        if (ret_val)
                return ret_val;

        igc_check_for_copper_link(hw);

out:
        return ret_val;
}

static s32 igc_get_invariants_base(struct igc_hw *hw)
{
        struct igc_mac_info *mac = &hw->mac;
        s32 ret_val = 0;

        switch (hw->device_id) {
        case IGC_DEV_ID_I225_LM:
        case IGC_DEV_ID_I225_V:
        case IGC_DEV_ID_I225_I:
        case IGC_DEV_ID_I220_V:
        case IGC_DEV_ID_I225_K:
        case IGC_DEV_ID_I225_K2:
        case IGC_DEV_ID_I226_K:
        case IGC_DEV_ID_I225_LMVP:
        case IGC_DEV_ID_I226_LMVP:
        case IGC_DEV_ID_I225_IT:
        case IGC_DEV_ID_I226_LM:
        case IGC_DEV_ID_I226_V:
        case IGC_DEV_ID_I226_IT:
        case IGC_DEV_ID_I221_V:
        case IGC_DEV_ID_I226_BLANK_NVM:
        case IGC_DEV_ID_I225_BLANK_NVM:
                mac->type = igc_i225;
                break;
        default:
                return -IGC_ERR_MAC_INIT;
        }

        hw->phy.media_type = igc_media_type_copper;

        /* mac initialization and operations */
        ret_val = igc_init_mac_params_base(hw);
        if (ret_val)
                goto out;

        /* NVM initialization */
        ret_val = igc_init_nvm_params_base(hw);
        if (ret_val)
                goto out;
        switch (hw->mac.type) {
        case igc_i225:
                ret_val = igc_init_nvm_params_i225(hw);
                break;
        default:
                break;
        }

        /* setup PHY parameters */
        ret_val = igc_init_phy_params_base(hw);
        if (ret_val)
                goto out;

out:
        return ret_val;
}

/**
 * igc_acquire_phy_base - Acquire rights to access PHY
 * @hw: pointer to the HW structure
 *
 * Acquire access rights to the correct PHY.  This is a
 * function pointer entry point called by the api module.
 */
static s32 igc_acquire_phy_base(struct igc_hw *hw)
{
        u16 mask = IGC_SWFW_PHY0_SM;

        return hw->mac.ops.acquire_swfw_sync(hw, mask);
}

/**
 * igc_release_phy_base - Release rights to access PHY
 * @hw: pointer to the HW structure
 *
 * A wrapper to release access rights to the correct PHY.  This is a
 * function pointer entry point called by the api module.
 */
static void igc_release_phy_base(struct igc_hw *hw)
{
        u16 mask = IGC_SWFW_PHY0_SM;

        hw->mac.ops.release_swfw_sync(hw, mask);
}

/**
 * igc_init_hw_base - Initialize hardware
 * @hw: pointer to the HW structure
 *
 * This inits the hardware readying it for operation.
 */
static s32 igc_init_hw_base(struct igc_hw *hw)
{
        struct igc_mac_info *mac = &hw->mac;
        u16 i, rar_count = mac->rar_entry_count;
        s32 ret_val = 0;

        /* Setup the receive address */
        igc_init_rx_addrs(hw, rar_count);

        /* Zero out the Multicast HASH table */
        hw_dbg("Zeroing the MTA\n");
        for (i = 0; i < mac->mta_reg_count; i++)
                array_wr32(IGC_MTA, i, 0);

        /* Zero out the Unicast HASH table */
        hw_dbg("Zeroing the UTA\n");
        for (i = 0; i < mac->uta_reg_count; i++)
                array_wr32(IGC_UTA, i, 0);

        /* Setup link and flow control */
        ret_val = igc_setup_link(hw);

        /* Clear all of the statistics registers (clear on read).  It is
         * important that we do this after we have tried to establish link
         * because the symbol error count will increment wildly if there
         * is no link.
         */
        igc_clear_hw_cntrs_base(hw);

        return ret_val;
}

/**
 * igc_power_down_phy_copper_base - Remove link during PHY power down
 * @hw: pointer to the HW structure
 *
 * In the case of a PHY power down to save power, or to turn off link during a
 * driver unload, or wake on lan is not enabled, remove the link.
 */
void igc_power_down_phy_copper_base(struct igc_hw *hw)
{
        /* If the management interface is not enabled, then power down */
        if (!(igc_enable_mng_pass_thru(hw) || igc_check_reset_block(hw)))
                igc_power_down_phy_copper(hw);
}

/**
 * igc_rx_fifo_flush_base - Clean rx fifo after Rx enable
 * @hw: pointer to the HW structure
 *
 * After Rx enable, if manageability is enabled then there is likely some
 * bad data at the start of the fifo and possibly in the DMA fifo.  This
 * function clears the fifos and flushes any packets that came in as rx was
 * being enabled.
 */
void igc_rx_fifo_flush_base(struct igc_hw *hw)
{
        u32 rctl, rlpml, rxdctl[4], rfctl, temp_rctl, rx_enabled;
        int i, ms_wait;

        /* disable IPv6 options as per hardware errata */
        rfctl = rd32(IGC_RFCTL);
        rfctl |= IGC_RFCTL_IPV6_EX_DIS;
        wr32(IGC_RFCTL, rfctl);

        if (!(rd32(IGC_MANC) & IGC_MANC_RCV_TCO_EN))
                return;

        /* Disable all Rx queues */
        for (i = 0; i < 4; i++) {
                rxdctl[i] = rd32(IGC_RXDCTL(i));
                wr32(IGC_RXDCTL(i),
                     rxdctl[i] & ~IGC_RXDCTL_QUEUE_ENABLE);
        }
        /* Poll all queues to verify they have shut down */
        for (ms_wait = 0; ms_wait < 10; ms_wait++) {
                usleep_range(1000, 2000);
                rx_enabled = 0;
                for (i = 0; i < 4; i++)
                        rx_enabled |= rd32(IGC_RXDCTL(i));
                if (!(rx_enabled & IGC_RXDCTL_QUEUE_ENABLE))
                        break;
        }

        if (ms_wait == 10)
                hw_dbg("Queue disable timed out after 10ms\n");

        /* Clear RLPML, RCTL.SBP, RFCTL.LEF, and set RCTL.LPE so that all
         * incoming packets are rejected.  Set enable and wait 2ms so that
         * any packet that was coming in as RCTL.EN was set is flushed
         */
        wr32(IGC_RFCTL, rfctl & ~IGC_RFCTL_LEF);

        rlpml = rd32(IGC_RLPML);
        wr32(IGC_RLPML, 0);

        rctl = rd32(IGC_RCTL);
        temp_rctl = rctl & ~(IGC_RCTL_EN | IGC_RCTL_SBP);
        temp_rctl |= IGC_RCTL_LPE;

        wr32(IGC_RCTL, temp_rctl);
        wr32(IGC_RCTL, temp_rctl | IGC_RCTL_EN);
        wrfl();
        usleep_range(2000, 3000);

        /* Enable Rx queues that were previously enabled and restore our
         * previous state
         */
        for (i = 0; i < 4; i++)
                wr32(IGC_RXDCTL(i), rxdctl[i]);
        wr32(IGC_RCTL, rctl);
        wrfl();

        wr32(IGC_RLPML, rlpml);
        wr32(IGC_RFCTL, rfctl);

        /* Flush receive errors generated by workaround */
        rd32(IGC_ROC);
        rd32(IGC_RNBC);
        rd32(IGC_MPC);
}

bool igc_is_device_id_i225(struct igc_hw *hw)
{
        switch (hw->device_id) {
        case IGC_DEV_ID_I225_LM:
        case IGC_DEV_ID_I225_V:
        case IGC_DEV_ID_I225_I:
        case IGC_DEV_ID_I225_K:
        case IGC_DEV_ID_I225_K2:
        case IGC_DEV_ID_I225_LMVP:
        case IGC_DEV_ID_I225_IT:
                return true;
        default:
                return false;
        }
}

bool igc_is_device_id_i226(struct igc_hw *hw)
{
        switch (hw->device_id) {
        case IGC_DEV_ID_I226_LM:
        case IGC_DEV_ID_I226_V:
        case IGC_DEV_ID_I226_K:
        case IGC_DEV_ID_I226_IT:
                return true;
        default:
                return false;
        }
}

static struct igc_mac_operations igc_mac_ops_base = {
        .init_hw                = igc_init_hw_base,
        .check_for_link         = igc_check_for_copper_link,
        .rar_set                = igc_rar_set,
        .read_mac_addr          = igc_read_mac_addr,
        .get_speed_and_duplex   = igc_get_speed_and_duplex_copper,
};

static const struct igc_phy_operations igc_phy_ops_base = {
        .acquire                = igc_acquire_phy_base,
        .release                = igc_release_phy_base,
        .reset                  = igc_phy_hw_reset,
        .read_reg               = igc_read_phy_reg_gpy,
        .write_reg              = igc_write_phy_reg_gpy,
};

const struct igc_info igc_base_info = {
        .get_invariants         = igc_get_invariants_base,
        .mac_ops                = &igc_mac_ops_base,
        .phy_ops                = &igc_phy_ops_base,
};