// SPDX-License-Identifier: (GPL-2.0 OR MIT)
// Copyright (c) 2017 Synopsys, Inc. and/or its affiliates.
// stmmac Support for 5.xx Ethernet QoS cores

#include <linux/bitops.h>
#include <linux/iopoll.h>
#include "common.h"
#include "dwmac4.h"
#include "dwmac5.h"
#include "stmmac.h"
#include "stmmac_ptp.h"

struct dwmac5_error_desc {
        bool valid;
        const char *desc;
        const char *detailed_desc;
};

#define STAT_OFF(field)         offsetof(struct stmmac_safety_stats, field)

static void dwmac5_log_error(struct net_device *ndev, u32 value, bool corr,
                const char *module_name, const struct dwmac5_error_desc *desc,
                unsigned long field_offset, struct stmmac_safety_stats *stats)
{
        unsigned long loc, mask;
        u8 *bptr = (u8 *)stats;
        unsigned long *ptr;

        ptr = (unsigned long *)(bptr + field_offset);

        mask = value;
        for_each_set_bit(loc, &mask, 32) {
                netdev_err(ndev, "Found %s error in %s: '%s: %s'\n", corr ?
                                "correctable" : "uncorrectable", module_name,
                                desc[loc].desc, desc[loc].detailed_desc);

                /* Update counters */
                ptr[loc]++;
        }
}

static const struct dwmac5_error_desc dwmac5_mac_errors[32]= {
        { true, "ATPES", "Application Transmit Interface Parity Check Error" },
        { true, "TPES", "TSO Data Path Parity Check Error" },
        { true, "RDPES", "Read Descriptor Parity Check Error" },
        { true, "MPES", "MTL Data Path Parity Check Error" },
        { true, "MTSPES", "MTL TX Status Data Path Parity Check Error" },
        { true, "ARPES", "Application Receive Interface Data Path Parity Check Error" },
        { true, "CWPES", "CSR Write Data Path Parity Check Error" },
        { true, "ASRPES", "AXI Slave Read Data Path Parity Check Error" },
        { true, "TTES", "TX FSM Timeout Error" },
        { true, "RTES", "RX FSM Timeout Error" },
        { true, "CTES", "CSR FSM Timeout Error" },
        { true, "ATES", "APP FSM Timeout Error" },
        { true, "PTES", "PTP FSM Timeout Error" },
        { true, "T125ES", "TX125 FSM Timeout Error" },
        { true, "R125ES", "RX125 FSM Timeout Error" },
        { true, "RVCTES", "REV MDC FSM Timeout Error" },
        { true, "MSTTES", "Master Read/Write Timeout Error" },
        { true, "SLVTES", "Slave Read/Write Timeout Error" },
        { true, "ATITES", "Application Timeout on ATI Interface Error" },
        { true, "ARITES", "Application Timeout on ARI Interface Error" },
        { false, "UNKNOWN", "Unknown Error" }, /* 20 */
        { false, "UNKNOWN", "Unknown Error" }, /* 21 */
        { false, "UNKNOWN", "Unknown Error" }, /* 22 */
        { false, "UNKNOWN", "Unknown Error" }, /* 23 */
        { true, "FSMPES", "FSM State Parity Error" },
        { false, "UNKNOWN", "Unknown Error" }, /* 25 */
        { false, "UNKNOWN", "Unknown Error" }, /* 26 */
        { false, "UNKNOWN", "Unknown Error" }, /* 27 */
        { false, "UNKNOWN", "Unknown Error" }, /* 28 */
        { false, "UNKNOWN", "Unknown Error" }, /* 29 */
        { false, "UNKNOWN", "Unknown Error" }, /* 30 */
        { false, "UNKNOWN", "Unknown Error" }, /* 31 */
};

static void dwmac5_handle_mac_err(struct net_device *ndev,
                void __iomem *ioaddr, bool correctable,
                struct stmmac_safety_stats *stats)
{
        u32 value;

        value = readl(ioaddr + MAC_DPP_FSM_INT_STATUS);
        writel(value, ioaddr + MAC_DPP_FSM_INT_STATUS);

        dwmac5_log_error(ndev, value, correctable, "MAC", dwmac5_mac_errors,
                        STAT_OFF(mac_errors), stats);
}

static const struct dwmac5_error_desc dwmac5_mtl_errors[32]= {
        { true, "TXCES", "MTL TX Memory Error" },
        { true, "TXAMS", "MTL TX Memory Address Mismatch Error" },
        { true, "TXUES", "MTL TX Memory Error" },
        { false, "UNKNOWN", "Unknown Error" }, /* 3 */
        { true, "RXCES", "MTL RX Memory Error" },
        { true, "RXAMS", "MTL RX Memory Address Mismatch Error" },
        { true, "RXUES", "MTL RX Memory Error" },
        { false, "UNKNOWN", "Unknown Error" }, /* 7 */
        { true, "ECES", "MTL EST Memory Error" },
        { true, "EAMS", "MTL EST Memory Address Mismatch Error" },
        { true, "EUES", "MTL EST Memory Error" },
        { false, "UNKNOWN", "Unknown Error" }, /* 11 */
        { true, "RPCES", "MTL RX Parser Memory Error" },
        { true, "RPAMS", "MTL RX Parser Memory Address Mismatch Error" },
        { true, "RPUES", "MTL RX Parser Memory Error" },
        { false, "UNKNOWN", "Unknown Error" }, /* 15 */
        { false, "UNKNOWN", "Unknown Error" }, /* 16 */
        { false, "UNKNOWN", "Unknown Error" }, /* 17 */
        { false, "UNKNOWN", "Unknown Error" }, /* 18 */
        { false, "UNKNOWN", "Unknown Error" }, /* 19 */
        { false, "UNKNOWN", "Unknown Error" }, /* 20 */
        { false, "UNKNOWN", "Unknown Error" }, /* 21 */
        { false, "UNKNOWN", "Unknown Error" }, /* 22 */
        { false, "UNKNOWN", "Unknown Error" }, /* 23 */
        { false, "UNKNOWN", "Unknown Error" }, /* 24 */
        { false, "UNKNOWN", "Unknown Error" }, /* 25 */
        { false, "UNKNOWN", "Unknown Error" }, /* 26 */
        { false, "UNKNOWN", "Unknown Error" }, /* 27 */
        { false, "UNKNOWN", "Unknown Error" }, /* 28 */
        { false, "UNKNOWN", "Unknown Error" }, /* 29 */
        { false, "UNKNOWN", "Unknown Error" }, /* 30 */
        { false, "UNKNOWN", "Unknown Error" }, /* 31 */
};

static void dwmac5_handle_mtl_err(struct net_device *ndev,
                void __iomem *ioaddr, bool correctable,
                struct stmmac_safety_stats *stats)
{
        u32 value;

        value = readl(ioaddr + MTL_ECC_INT_STATUS);
        writel(value, ioaddr + MTL_ECC_INT_STATUS);

        dwmac5_log_error(ndev, value, correctable, "MTL", dwmac5_mtl_errors,
                        STAT_OFF(mtl_errors), stats);
}

static const struct dwmac5_error_desc dwmac5_dma_errors[32]= {
        { true, "TCES", "DMA TSO Memory Error" },
        { true, "TAMS", "DMA TSO Memory Address Mismatch Error" },
        { true, "TUES", "DMA TSO Memory Error" },
        { false, "UNKNOWN", "Unknown Error" }, /* 3 */
        { false, "UNKNOWN", "Unknown Error" }, /* 4 */
        { false, "UNKNOWN", "Unknown Error" }, /* 5 */
        { false, "UNKNOWN", "Unknown Error" }, /* 6 */
        { false, "UNKNOWN", "Unknown Error" }, /* 7 */
        { false, "UNKNOWN", "Unknown Error" }, /* 8 */
        { false, "UNKNOWN", "Unknown Error" }, /* 9 */
        { false, "UNKNOWN", "Unknown Error" }, /* 10 */
        { false, "UNKNOWN", "Unknown Error" }, /* 11 */
        { false, "UNKNOWN", "Unknown Error" }, /* 12 */
        { false, "UNKNOWN", "Unknown Error" }, /* 13 */
        { false, "UNKNOWN", "Unknown Error" }, /* 14 */
        { false, "UNKNOWN", "Unknown Error" }, /* 15 */
        { false, "UNKNOWN", "Unknown Error" }, /* 16 */
        { false, "UNKNOWN", "Unknown Error" }, /* 17 */
        { false, "UNKNOWN", "Unknown Error" }, /* 18 */
        { false, "UNKNOWN", "Unknown Error" }, /* 19 */
        { false, "UNKNOWN", "Unknown Error" }, /* 20 */
        { false, "UNKNOWN", "Unknown Error" }, /* 21 */
        { false, "UNKNOWN", "Unknown Error" }, /* 22 */
        { false, "UNKNOWN", "Unknown Error" }, /* 23 */
        { false, "UNKNOWN", "Unknown Error" }, /* 24 */
        { false, "UNKNOWN", "Unknown Error" }, /* 25 */
        { false, "UNKNOWN", "Unknown Error" }, /* 26 */
        { false, "UNKNOWN", "Unknown Error" }, /* 27 */
        { false, "UNKNOWN", "Unknown Error" }, /* 28 */
        { false, "UNKNOWN", "Unknown Error" }, /* 29 */
        { false, "UNKNOWN", "Unknown Error" }, /* 30 */
        { false, "UNKNOWN", "Unknown Error" }, /* 31 */
};

static void dwmac5_handle_dma_err(struct net_device *ndev,
                void __iomem *ioaddr, bool correctable,
                struct stmmac_safety_stats *stats)
{
        u32 value;

        value = readl(ioaddr + DMA_ECC_INT_STATUS);
        writel(value, ioaddr + DMA_ECC_INT_STATUS);

        dwmac5_log_error(ndev, value, correctable, "DMA", dwmac5_dma_errors,
                        STAT_OFF(dma_errors), stats);
}

int dwmac5_safety_feat_config(void __iomem *ioaddr, unsigned int asp,
                              struct stmmac_safety_feature_cfg *safety_feat_cfg)
{
        struct stmmac_safety_feature_cfg all_safety_feats = {
                .tsoee = 1,
                .mrxpee = 1,
                .mestee = 1,
                .mrxee = 1,
                .mtxee = 1,
                .epsi = 1,
                .edpp = 1,
                .prtyen = 1,
                .tmouten = 1,
        };
        u32 value;

        if (!asp)
                return -EINVAL;

        if (!safety_feat_cfg)
                safety_feat_cfg = &all_safety_feats;

        /* 1. Enable Safety Features */
        value = readl(ioaddr + MTL_ECC_CONTROL);
        value |= MEEAO; /* MTL ECC Error Addr Status Override */
        if (safety_feat_cfg->tsoee)
                value |= TSOEE; /* TSO ECC */
        if (safety_feat_cfg->mrxpee)
                value |= MRXPEE; /* MTL RX Parser ECC */
        if (safety_feat_cfg->mestee)
                value |= MESTEE; /* MTL EST ECC */
        if (safety_feat_cfg->mrxee)
                value |= MRXEE; /* MTL RX FIFO ECC */
        if (safety_feat_cfg->mtxee)
                value |= MTXEE; /* MTL TX FIFO ECC */
        writel(value, ioaddr + MTL_ECC_CONTROL);

        /* 2. Enable MTL Safety Interrupts */
        value = readl(ioaddr + MTL_ECC_INT_ENABLE);
        value |= RPCEIE; /* RX Parser Memory Correctable Error */
        value |= ECEIE; /* EST Memory Correctable Error */
        value |= RXCEIE; /* RX Memory Correctable Error */
        value |= TXCEIE; /* TX Memory Correctable Error */
        writel(value, ioaddr + MTL_ECC_INT_ENABLE);

        /* 3. Enable DMA Safety Interrupts */
        value = readl(ioaddr + DMA_ECC_INT_ENABLE);
        value |= TCEIE; /* TSO Memory Correctable Error */
        writel(value, ioaddr + DMA_ECC_INT_ENABLE);

        /* Only ECC Protection for External Memory feature is selected */
        if (asp <= 0x1)
                return 0;

        /* 5. Enable Parity and Timeout for FSM */
        value = readl(ioaddr + MAC_FSM_CONTROL);
        if (safety_feat_cfg->prtyen)
                value |= PRTYEN; /* FSM Parity Feature */
        if (safety_feat_cfg->tmouten)
                value |= TMOUTEN; /* FSM Timeout Feature */
        writel(value, ioaddr + MAC_FSM_CONTROL);

        /* 4. Enable Data Parity Protection */
        value = readl(ioaddr + MTL_DPP_CONTROL);
        if (safety_feat_cfg->edpp)
                value |= EDPP;
        writel(value, ioaddr + MTL_DPP_CONTROL);

        /*
         * All the Automotive Safety features are selected without the "Parity
         * Port Enable for external interface" feature.
         */
        if (asp <= 0x2)
                return 0;

        if (safety_feat_cfg->epsi)
                value |= EPSI;
        writel(value, ioaddr + MTL_DPP_CONTROL);
        return 0;
}

int dwmac5_safety_feat_irq_status(struct net_device *ndev,
                void __iomem *ioaddr, unsigned int asp,
                struct stmmac_safety_stats *stats)
{
        bool err, corr;
        u32 mtl, dma;
        int ret = 0;

        if (!asp)
                return -EINVAL;

        mtl = readl(ioaddr + MTL_SAFETY_INT_STATUS);
        dma = readl(ioaddr + DMA_SAFETY_INT_STATUS);

        err = (mtl & MCSIS) || (dma & MCSIS);
        corr = false;
        if (err) {
                dwmac5_handle_mac_err(ndev, ioaddr, corr, stats);
                ret |= !corr;
        }

        err = (mtl & (MEUIS | MECIS)) || (dma & (MSUIS | MSCIS));
        corr = (mtl & MECIS) || (dma & MSCIS);
        if (err) {
                dwmac5_handle_mtl_err(ndev, ioaddr, corr, stats);
                ret |= !corr;
        }

        err = dma & (DEUIS | DECIS);
        corr = dma & DECIS;
        if (err) {
                dwmac5_handle_dma_err(ndev, ioaddr, corr, stats);
                ret |= !corr;
        }

        return ret;
}

static const struct dwmac5_error {
        const struct dwmac5_error_desc *desc;
} dwmac5_all_errors[] = {
        { dwmac5_mac_errors },
        { dwmac5_mtl_errors },
        { dwmac5_dma_errors },
};

int dwmac5_safety_feat_dump(struct stmmac_safety_stats *stats,
                        int index, unsigned long *count, const char **desc)
{
        int module = index / 32, offset = index % 32;
        unsigned long *ptr = (unsigned long *)stats;

        if (module >= ARRAY_SIZE(dwmac5_all_errors))
                return -EINVAL;
        if (!dwmac5_all_errors[module].desc[offset].valid)
                return -EINVAL;
        if (count)
                *count = *(ptr + index);
        if (desc)
                *desc = dwmac5_all_errors[module].desc[offset].desc;
        return 0;
}

static int dwmac5_rxp_disable(void __iomem *ioaddr)
{
        u32 val;

        val = readl(ioaddr + MTL_OPERATION_MODE);
        val &= ~MTL_FRPE;
        writel(val, ioaddr + MTL_OPERATION_MODE);

        return readl_poll_timeout(ioaddr + MTL_RXP_CONTROL_STATUS, val,
                        val & RXPI, 1, 10000);
}

static void dwmac5_rxp_enable(void __iomem *ioaddr)
{
        u32 val;

        val = readl(ioaddr + MTL_OPERATION_MODE);
        val |= MTL_FRPE;
        writel(val, ioaddr + MTL_OPERATION_MODE);
}

static int dwmac5_rxp_update_single_entry(void __iomem *ioaddr,
                                          struct stmmac_tc_entry *entry,
                                          int pos)
{
        int ret, i;

        for (i = 0; i < (sizeof(entry->val) / sizeof(u32)); i++) {
                int real_pos = pos * (sizeof(entry->val) / sizeof(u32)) + i;
                u32 val;

                /* Wait for ready */
                ret = readl_poll_timeout(ioaddr + MTL_RXP_IACC_CTRL_STATUS,
                                val, !(val & STARTBUSY), 1, 10000);
                if (ret)
                        return ret;

                /* Write data */
                val = *((u32 *)&entry->val + i);
                writel(val, ioaddr + MTL_RXP_IACC_DATA);

                /* Write pos */
                val = real_pos & ADDR;
                writel(val, ioaddr + MTL_RXP_IACC_CTRL_STATUS);

                /* Write OP */
                val |= WRRDN;
                writel(val, ioaddr + MTL_RXP_IACC_CTRL_STATUS);

                /* Start Write */
                val |= STARTBUSY;
                writel(val, ioaddr + MTL_RXP_IACC_CTRL_STATUS);

                /* Wait for done */
                ret = readl_poll_timeout(ioaddr + MTL_RXP_IACC_CTRL_STATUS,
                                val, !(val & STARTBUSY), 1, 10000);
                if (ret)
                        return ret;
        }

        return 0;
}

static struct stmmac_tc_entry *
dwmac5_rxp_get_next_entry(struct stmmac_tc_entry *entries, unsigned int count,
                          u32 curr_prio)
{
        struct stmmac_tc_entry *entry;
        u32 min_prio = ~0x0;
        int i, min_prio_idx;
        bool found = false;

        for (i = count - 1; i >= 0; i--) {
                entry = &entries[i];

                /* Do not update unused entries */
                if (!entry->in_use)
                        continue;
                /* Do not update already updated entries (i.e. fragments) */
                if (entry->in_hw)
                        continue;
                /* Let last entry be updated last */
                if (entry->is_last)
                        continue;
                /* Do not return fragments */
                if (entry->is_frag)
                        continue;
                /* Check if we already checked this prio */
                if (entry->prio < curr_prio)
                        continue;
                /* Check if this is the minimum prio */
                if (entry->prio < min_prio) {
                        min_prio = entry->prio;
                        min_prio_idx = i;
                        found = true;
                }
        }

        if (found)
                return &entries[min_prio_idx];
        return NULL;
}

int dwmac5_rxp_config(void __iomem *ioaddr, struct stmmac_tc_entry *entries,
                      unsigned int count)
{
        struct stmmac_tc_entry *entry, *frag;
        int i, ret, nve = 0;
        u32 curr_prio = 0;
        u32 old_val, val;

        /* Force disable RX */
        old_val = readl(ioaddr + GMAC_CONFIG);
        val = old_val & ~GMAC_CONFIG_RE;
        writel(val, ioaddr + GMAC_CONFIG);

        /* Disable RX Parser */
        ret = dwmac5_rxp_disable(ioaddr);
        if (ret)
                goto re_enable;

        /* Set all entries as NOT in HW */
        for (i = 0; i < count; i++) {
                entry = &entries[i];
                entry->in_hw = false;
        }

        /* Update entries by reverse order */
        while (1) {
                entry = dwmac5_rxp_get_next_entry(entries, count, curr_prio);
                if (!entry)
                        break;

                curr_prio = entry->prio;
                frag = entry->frag_ptr;

                /* Set special fragment requirements */
                if (frag) {
                        entry->val.af = 0;
                        entry->val.rf = 0;
                        entry->val.nc = 1;
                        entry->val.ok_index = nve + 2;
                }

                ret = dwmac5_rxp_update_single_entry(ioaddr, entry, nve);
                if (ret)
                        goto re_enable;

                entry->table_pos = nve++;
                entry->in_hw = true;

                if (frag && !frag->in_hw) {
                        ret = dwmac5_rxp_update_single_entry(ioaddr, frag, nve);
                        if (ret)
                                goto re_enable;
                        frag->table_pos = nve++;
                        frag->in_hw = true;
                }
        }

        if (!nve)
                goto re_enable;

        /* Update all pass entry */
        for (i = 0; i < count; i++) {
                entry = &entries[i];
                if (!entry->is_last)
                        continue;

                ret = dwmac5_rxp_update_single_entry(ioaddr, entry, nve);
                if (ret)
                        goto re_enable;

                entry->table_pos = nve++;
        }

        /* Assume n. of parsable entries == n. of valid entries */
        val = (nve << 16) & NPE;
        val |= nve & NVE;
        writel(val, ioaddr + MTL_RXP_CONTROL_STATUS);

        /* Enable RX Parser */
        dwmac5_rxp_enable(ioaddr);

re_enable:
        /* Re-enable RX */
        writel(old_val, ioaddr + GMAC_CONFIG);
        return ret;
}

int dwmac5_flex_pps_config(void __iomem *ioaddr, int index,
                           struct stmmac_pps_cfg *cfg, bool enable,
                           u32 sub_second_inc, u32 systime_flags)
{
        u32 tnsec = readl(ioaddr + MAC_PPSx_TARGET_TIME_NSEC(index));
        u32 val = readl(ioaddr + MAC_PPS_CONTROL);
        u64 period;

        if (!cfg->available)
                return -EINVAL;
        if (tnsec & TRGTBUSY0)
                return -EBUSY;
        if (!sub_second_inc || !systime_flags)
                return -EINVAL;

        val &= ~PPSx_MASK(index);

        if (!enable) {
                val |= PPSCMDx(index, 0x5);
                val |= PPSEN0;
                writel(val, ioaddr + MAC_PPS_CONTROL);
                return 0;
        }

        val |= TRGTMODSELx(index, 0x2);
        val |= PPSEN0;
        writel(val, ioaddr + MAC_PPS_CONTROL);

        writel(cfg->start.tv_sec, ioaddr + MAC_PPSx_TARGET_TIME_SEC(index));

        if (!(systime_flags & PTP_TCR_TSCTRLSSR))
                cfg->start.tv_nsec = (cfg->start.tv_nsec * 1000) / 465;
        writel(cfg->start.tv_nsec, ioaddr + MAC_PPSx_TARGET_TIME_NSEC(index));

        period = cfg->period.tv_sec * 1000000000;
        period += cfg->period.tv_nsec;

        do_div(period, sub_second_inc);

        if (period <= 1)
                return -EINVAL;

        writel(period - 1, ioaddr + MAC_PPSx_INTERVAL(index));

        period >>= 1;
        if (period <= 1)
                return -EINVAL;

        writel(period - 1, ioaddr + MAC_PPSx_WIDTH(index));

        /* Finally, activate it */
        val |= PPSCMDx(index, 0x2);
        writel(val, ioaddr + MAC_PPS_CONTROL);
        return 0;
}