// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause)
/*
 * Copyright (c) 2014-2025, Advanced Micro Devices, Inc.
 * Copyright (c) 2014, Synopsys, Inc.
 * All rights reserved
 */

#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/slab.h>

#include "xgbe.h"
#include "xgbe-common.h"

static ssize_t xgbe_common_read(char __user *buffer, size_t count,
                                loff_t *ppos, unsigned int value)
{
        char *buf;
        ssize_t len;

        if (*ppos != 0)
                return 0;

        buf = kasprintf(GFP_KERNEL, "0x%08x\n", value);
        if (!buf)
                return -ENOMEM;

        if (count < strlen(buf)) {
                kfree(buf);
                return -ENOSPC;
        }

        len = simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
        kfree(buf);

        return len;
}

static ssize_t xgbe_common_write(const char __user *buffer, size_t count,
                                 loff_t *ppos, unsigned int *value)
{
        char workarea[32];
        ssize_t len;
        int ret;

        if (*ppos != 0)
                return -EINVAL;

        if (count >= sizeof(workarea))
                return -ENOSPC;

        len = simple_write_to_buffer(workarea, sizeof(workarea) - 1, ppos,
                                     buffer, count);
        if (len < 0)
                return len;

        workarea[len] = '\0';
        ret = kstrtouint(workarea, 16, value);
        if (ret)
                return -EIO;

        return len;
}

static ssize_t xgmac_reg_addr_read(struct file *filp, char __user *buffer,
                                   size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;

        return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xgmac_reg);
}

static ssize_t xgmac_reg_addr_write(struct file *filp,
                                    const char __user *buffer,
                                    size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;

        return xgbe_common_write(buffer, count, ppos,
                                 &pdata->debugfs_xgmac_reg);
}

static ssize_t xgmac_reg_value_read(struct file *filp, char __user *buffer,
                                    size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;
        unsigned int value;

        value = XGMAC_IOREAD(pdata, pdata->debugfs_xgmac_reg);

        return xgbe_common_read(buffer, count, ppos, value);
}

static ssize_t xgmac_reg_value_write(struct file *filp,
                                     const char __user *buffer,
                                     size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;
        unsigned int value;
        ssize_t len;

        len = xgbe_common_write(buffer, count, ppos, &value);
        if (len < 0)
                return len;

        XGMAC_IOWRITE(pdata, pdata->debugfs_xgmac_reg, value);

        return len;
}

static const struct file_operations xgmac_reg_addr_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read =  xgmac_reg_addr_read,
        .write = xgmac_reg_addr_write,
};

static const struct file_operations xgmac_reg_value_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read =  xgmac_reg_value_read,
        .write = xgmac_reg_value_write,
};

static ssize_t xpcs_mmd_read(struct file *filp, char __user *buffer,
                             size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;

        return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xpcs_mmd);
}

static ssize_t xpcs_mmd_write(struct file *filp, const char __user *buffer,
                              size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;

        return xgbe_common_write(buffer, count, ppos,
                                 &pdata->debugfs_xpcs_mmd);
}

static ssize_t xpcs_reg_addr_read(struct file *filp, char __user *buffer,
                                  size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;

        return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xpcs_reg);
}

static ssize_t xpcs_reg_addr_write(struct file *filp, const char __user *buffer,
                                   size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;

        return xgbe_common_write(buffer, count, ppos,
                                 &pdata->debugfs_xpcs_reg);
}

static ssize_t xpcs_reg_value_read(struct file *filp, char __user *buffer,
                                   size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;
        unsigned int value;

        value = XMDIO_READ(pdata, pdata->debugfs_xpcs_mmd,
                           pdata->debugfs_xpcs_reg);

        return xgbe_common_read(buffer, count, ppos, value);
}

static ssize_t xpcs_reg_value_write(struct file *filp,
                                    const char __user *buffer,
                                    size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;
        unsigned int value;
        ssize_t len;

        len = xgbe_common_write(buffer, count, ppos, &value);
        if (len < 0)
                return len;

        XMDIO_WRITE(pdata, pdata->debugfs_xpcs_mmd, pdata->debugfs_xpcs_reg,
                    value);

        return len;
}

static const struct file_operations xpcs_mmd_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read =  xpcs_mmd_read,
        .write = xpcs_mmd_write,
};

static const struct file_operations xpcs_reg_addr_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read =  xpcs_reg_addr_read,
        .write = xpcs_reg_addr_write,
};

static const struct file_operations xpcs_reg_value_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read =  xpcs_reg_value_read,
        .write = xpcs_reg_value_write,
};

static ssize_t xprop_reg_addr_read(struct file *filp, char __user *buffer,
                                   size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;

        return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xprop_reg);
}

static ssize_t xprop_reg_addr_write(struct file *filp,
                                    const char __user *buffer,
                                    size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;

        return xgbe_common_write(buffer, count, ppos,
                                 &pdata->debugfs_xprop_reg);
}

static ssize_t xprop_reg_value_read(struct file *filp, char __user *buffer,
                                    size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;
        unsigned int value;

        value = XP_IOREAD(pdata, pdata->debugfs_xprop_reg);

        return xgbe_common_read(buffer, count, ppos, value);
}

static ssize_t xprop_reg_value_write(struct file *filp,
                                     const char __user *buffer,
                                     size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;
        unsigned int value;
        ssize_t len;

        len = xgbe_common_write(buffer, count, ppos, &value);
        if (len < 0)
                return len;

        XP_IOWRITE(pdata, pdata->debugfs_xprop_reg, value);

        return len;
}

static const struct file_operations xprop_reg_addr_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read =  xprop_reg_addr_read,
        .write = xprop_reg_addr_write,
};

static const struct file_operations xprop_reg_value_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read =  xprop_reg_value_read,
        .write = xprop_reg_value_write,
};

static ssize_t xi2c_reg_addr_read(struct file *filp, char __user *buffer,
                                  size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;

        return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xi2c_reg);
}

static ssize_t xi2c_reg_addr_write(struct file *filp,
                                   const char __user *buffer,
                                   size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;

        return xgbe_common_write(buffer, count, ppos,
                                 &pdata->debugfs_xi2c_reg);
}

static ssize_t xi2c_reg_value_read(struct file *filp, char __user *buffer,
                                   size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;
        unsigned int value;

        value = XI2C_IOREAD(pdata, pdata->debugfs_xi2c_reg);

        return xgbe_common_read(buffer, count, ppos, value);
}

static ssize_t xi2c_reg_value_write(struct file *filp,
                                    const char __user *buffer,
                                    size_t count, loff_t *ppos)
{
        struct xgbe_prv_data *pdata = filp->private_data;
        unsigned int value;
        ssize_t len;

        len = xgbe_common_write(buffer, count, ppos, &value);
        if (len < 0)
                return len;

        XI2C_IOWRITE(pdata, pdata->debugfs_xi2c_reg, value);

        return len;
}

static const struct file_operations xi2c_reg_addr_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read =  xi2c_reg_addr_read,
        .write = xi2c_reg_addr_write,
};

static const struct file_operations xi2c_reg_value_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read =  xi2c_reg_value_read,
        .write = xi2c_reg_value_write,
};

void xgbe_debugfs_init(struct xgbe_prv_data *pdata)
{
        char *buf;

        /* Set defaults */
        pdata->debugfs_xgmac_reg = 0;
        pdata->debugfs_xpcs_mmd = 1;
        pdata->debugfs_xpcs_reg = 0;

        buf = kasprintf(GFP_KERNEL, "amd-xgbe-%s", pdata->netdev->name);
        if (!buf)
                return;

        pdata->xgbe_debugfs = debugfs_create_dir(buf, NULL);

        debugfs_create_file("xgmac_register", 0600, pdata->xgbe_debugfs, pdata,
                            &xgmac_reg_addr_fops);

        debugfs_create_file("xgmac_register_value", 0600, pdata->xgbe_debugfs,
                            pdata, &xgmac_reg_value_fops);

        debugfs_create_file("xpcs_mmd", 0600, pdata->xgbe_debugfs, pdata,
                            &xpcs_mmd_fops);

        debugfs_create_file("xpcs_register", 0600, pdata->xgbe_debugfs, pdata,
                            &xpcs_reg_addr_fops);

        debugfs_create_file("xpcs_register_value", 0600, pdata->xgbe_debugfs,
                            pdata, &xpcs_reg_value_fops);

        if (pdata->xprop_regs) {
                debugfs_create_file("xprop_register", 0600, pdata->xgbe_debugfs,
                                    pdata, &xprop_reg_addr_fops);

                debugfs_create_file("xprop_register_value", 0600,
                                    pdata->xgbe_debugfs, pdata,
                                    &xprop_reg_value_fops);
        }

        if (pdata->xi2c_regs) {
                debugfs_create_file("xi2c_register", 0600, pdata->xgbe_debugfs,
                                    pdata, &xi2c_reg_addr_fops);

                debugfs_create_file("xi2c_register_value", 0600,
                                    pdata->xgbe_debugfs, pdata,
                                    &xi2c_reg_value_fops);
        }

        if (pdata->vdata->an_cdr_workaround) {
                debugfs_create_bool("an_cdr_workaround", 0600,
                                    pdata->xgbe_debugfs,
                                    &pdata->debugfs_an_cdr_workaround);

                debugfs_create_bool("an_cdr_track_early", 0600,
                                    pdata->xgbe_debugfs,
                                    &pdata->debugfs_an_cdr_track_early);
        }

        kfree(buf);
}

void xgbe_debugfs_exit(struct xgbe_prv_data *pdata)
{
        debugfs_remove_recursive(pdata->xgbe_debugfs);
        pdata->xgbe_debugfs = NULL;
}

void xgbe_debugfs_rename(struct xgbe_prv_data *pdata)
{
        debugfs_change_name(pdata->xgbe_debugfs,
                            "amd-xgbe-%s", pdata->netdev->name);
}