/*
 * Copyright (c) 2019-2020, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/errno.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <dce.h>
#include <dce-log.h>
#include <dce-util-common.h>
#include <interface/dce-interface.h>

/**
 * dbg_dce_load_fw - loads the fw to DRAM.
 *
 * @d : Pointer to dce struct
 *
 * Return : 0 if successful
 */
static int dbg_dce_load_fw(struct tegra_dce *d)
{
	const char *name = dce_get_fw_name(d);

	d->fw_data = dce_request_firmware(d, name);
	if (!d->fw_data) {
		dce_err(d, "FW Request Failed");
		return -EBUSY;
	}

	dce_set_load_fw_status(d, true);

	return 0;
}

/**
 * dbg_dce_config_ast - Configures the ast and sets the status.
 *
 * @d : Pointer to dce struct
 *
 * Return : Void
 */
static void dbg_dce_config_ast(struct tegra_dce *d)
{
	dce_config_ast(d);
	dce_set_ast_config_status(d, true);
}

/**
 * dbg_dce_reset_dce - Configures the evp in DCE cluster
 *				and brings dce out of reset.
 *
 * @d : Pointer to dce struct
 *
 * Return : 0 if successful
 */
static int dbg_dce_reset_dce(struct tegra_dce *d)
{
	int ret = 0;


	ret = dce_reset_dce(d);
	if (ret) {
		dce_err(d, "DCE Reset Failed");
		return ret;
	}
	dce_set_dce_reset_status(d, true);

	return ret;

}

/**
 * dbg_dce_boot_dce - loads the fw and configures other dce cluster
 *			elements for bringing dce out of reset.
 *
 * @d : Pointer to dce struct
 *
 * Return : 0 if successful
 */
static int dbg_dce_boot_dce(struct tegra_dce *d)
{
	int ret = 0;


	ret = dbg_dce_load_fw(d);
	if (ret) {
		dce_err(d, "DCE Load FW Failed");
		return ret;
	}

	dbg_dce_config_ast(d);

	ret = dbg_dce_reset_dce(d);

	if (ret)
		dce_err(d, "DCE Reset Failed");

	return ret;

}

static ssize_t dbg_dce_load_fw_read(struct file *file,
			char __user *user_buf, size_t count, loff_t *ppos)
{
	char buf[3];
	struct tegra_dce *d = file->private_data;

	if (d->load_complete)
		buf[0] = 'Y';
	else
		buf[0] = 'N';
	buf[1] = '\n';
	buf[2] = 0x00;

	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
}

static ssize_t dbg_dce_load_fw_write(struct file *file,
			const char __user *user_buf, size_t count, loff_t *ppos)
{
	int ret = 0;
	char buf[32];
	int buf_size;
	bool bv;
	struct tegra_dce *d = file->private_data;

	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;

	if (strtobool(buf, &bv) == 0) {
		if (bv == true) {
			ret = dbg_dce_load_fw(d);
			if (ret)
				return ret;
		}
	}

	return count;
}

static const struct file_operations load_firmware_fops = {
	.open =		simple_open,
	.read =		dbg_dce_load_fw_read,
	.write =	dbg_dce_load_fw_write,
};

static ssize_t dbg_dce_config_ast_read(struct file *file,
			char __user *user_buf, size_t count, loff_t *ppos)
{
	char buf[3];
	struct tegra_dce *d = file->private_data;

	if (d->ast_config_complete)
		buf[0] = 'Y';
	else
		buf[0] = 'N';
	buf[1] = '\n';
	buf[2] = 0x00;

	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
}

static ssize_t dbg_dce_config_ast_write(struct file *file,
			const char __user *user_buf, size_t count, loff_t *ppos)
{
	char buf[32];
	int buf_size;
	bool bv;
	struct tegra_dce *d = file->private_data;

	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;

	if (strtobool(buf, &bv) == 0) {
		if (bv == true)
			dbg_dce_config_ast(d);
	}

	return count;
}

static const struct file_operations config_ast_fops = {
	.open =		simple_open,
	.read =		dbg_dce_config_ast_read,
	.write =	dbg_dce_config_ast_write,
};

static ssize_t dbg_dce_reset_dce_fops_read(struct file *file,
			char __user *user_buf, size_t count, loff_t *ppos)
{
	char buf[3];
	struct tegra_dce *d = file->private_data;

	if (d->reset_complete)
		buf[0] = 'Y';
	else
		buf[0] = 'N';
	buf[1] = '\n';
	buf[2] = 0x00;

	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
}

static ssize_t dbg_dce_reset_dce_fops_write(struct file *file,
			const char __user *user_buf, size_t count, loff_t *ppos)
{
	int ret = 0;
	char buf[32];
	int buf_size;
	bool bv;
	struct tegra_dce *d = file->private_data;

	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;

	if (strtobool(buf, &bv) == 0) {
		if (bv == true) {
			ret = dbg_dce_reset_dce(d);
			if (ret)
				return ret;
		}
	}

	return count;
}

static const struct file_operations reset_dce_fops = {
	.open =		simple_open,
	.read =		dbg_dce_reset_dce_fops_read,
	.write =	dbg_dce_reset_dce_fops_write,
};

static ssize_t dbg_dce_boot_dce_fops_read(struct file *file,
			char __user *user_buf, size_t count, loff_t *ppos)
{
	char buf[3];
	struct tegra_dce *d = file->private_data;

	if (d->ast_config_complete &&
		d->reset_complete && d->load_complete)
		buf[0] = 'Y';
	else
		buf[0] = 'N';
	buf[1] = '\n';
	buf[2] = 0x00;

	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
}

static ssize_t dbg_dce_boot_dce_fops_write(struct file *file,
			const char __user *user_buf, size_t count, loff_t *ppos)
{
	int ret = 0;
	char buf[32];
	int buf_size;
	bool bv;
	struct tegra_dce *d = file->private_data;

	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;

	if (strtobool(buf, &bv) == 0) {
		if (bv == true) {
			ret = dbg_dce_boot_dce(d);
			if (ret)
				return ret;
		}
	}

	return count;
}

static const struct file_operations boot_dce_fops = {
	.open =		simple_open,
	.read =		dbg_dce_boot_dce_fops_read,
	.write =	dbg_dce_boot_dce_fops_write,
};

void dce_remove_debug(struct tegra_dce *d)
{
	struct dce_device *d_dev = dce_device_from_dce(d);

	debugfs_remove(d_dev->debugfs);

	d_dev->debugfs = NULL;
}

int dump_hsp_regs_show(struct seq_file *s, void *unused)
{
	u8 i = 0;
	struct tegra_dce *d = s->private;

	/**
	 * Dump Boot Semaphore Value
	 */
	dce_info(d, "DCE_BOOT_SEMA : 0x%x",
				dce_ss_get_state(d, DCE_BOOT_SEMA));

	/**
	 * Dump Shared Mailboxes Values
	 */
	dce_info(d, "DCE_MBOX_FROM_DCE_RM : 0x%x",
				dce_smb_read(d, DCE_MBOX_FROM_DCE_RM));
	dce_info(d, "DCE_MBOX_TO_DCE_RM: 0x%x",
				dce_smb_read(d, DCE_MBOX_TO_DCE_RM));
	dce_info(d, "DCE_MBOX_FROM_BPMP: 0x%x",
				dce_smb_read(d, DCE_MBOX_FROM_BPMP));
	dce_info(d, "DCE_MBOX_TO_BPMP: 0x%x",
				dce_smb_read(d, DCE_MBOX_TO_BPMP));
	dce_info(d, "DCE_MBOX_FROM_DCE_ADMIN: 0x%x",
				dce_smb_read(d, DCE_MBOX_FROM_DCE_ADMIN));
	dce_info(d, "DCE_MBOX_BOOT_CMD: 0x%x",
				dce_smb_read(d, DCE_MBOX_BOOT_CMD));
	dce_info(d, "DCE_MBOX_IRQ: 0x%x",
				dce_smb_read(d, DCE_MBOX_IRQ));

	/**
	 * Dump HSP IE registers Values
	 */

#define DCE_MAX_IE_REGS 5U
	for (i = 0; i < DCE_MAX_IE_REGS; i++)
		dce_info(d, "DCE_HSP_IE_%d : 0x%x", i, dce_hsp_ie_read(d, i));
#undef DCE_MAX_IE_REGS

	/**
	 * Dump HSP IE registers Values
	 */
#define DCE_MAX_SM_FULL_REGS 8U
	for (i = 0; i < DCE_MAX_SM_FULL_REGS; i++) {
		dce_info(d, "DCE_HSP_SM_FULL_%d : 0x%x", i,
			 dce_smb_read_full_ie(d, i));
	}
#undef DCE_MAX_SM_FULL_REGS

	dce_info(d, "DCE_HSP_IR : 0x%x",
					dce_hsp_ir_read(d));
	return 0;
}

static int dump_hsp_regs_open(struct inode *inode, struct file *file)
{
	return single_open(file, dump_hsp_regs_show, inode->i_private);
}

static const struct file_operations dump_hsp_regs_fops = {
	.open		= dump_hsp_regs_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

/**
 * dce_init_debug - Initializes the debug features of dce
 *
 * @d : Pointer to tegra_dce struct.
 *
 * Return : Void
 */
void dce_init_debug(struct tegra_dce *d)
{
	struct dentry *retval;
	struct device *dev = dev_from_dce(d);
	struct dce_device *d_dev = dce_device_from_dce(d);

	d_dev->debugfs = debugfs_create_dir("tegra_dce", NULL);
	if (!d_dev->debugfs)
		return;

	retval = debugfs_create_file("load_fw", 0444,
				d_dev->debugfs, d, &load_firmware_fops);
	if (!retval)
		goto err_handle;

	retval = debugfs_create_file("config_ast", 0444,
				d_dev->debugfs, d, &config_ast_fops);
	if (!retval)
		goto err_handle;

	retval = debugfs_create_file("reset_dce", 0444,
				d_dev->debugfs, d, &reset_dce_fops);
	if (!retval)
		goto err_handle;

	retval = debugfs_create_file("boot_dce", 0444,
				d_dev->debugfs, d, &boot_dce_fops);
	if (!retval)
		goto err_handle;

	retval = debugfs_create_bool("boot_status", 0644,
				d_dev->debugfs, &d->boot_complete);
	if (!retval)
		goto err_handle;

	retval = debugfs_create_file("dump_hsp_regs", 0444,
				d_dev->debugfs, d, &dump_hsp_regs_fops);
	if (!retval)
		goto err_handle;

	return;

err_handle:
	dev_err(dev, "could not create debugfs\n");
	dce_remove_debug(d);
}