/***********************license start************************************
 * Copyright (c) 2003-2017 Cavium, Inc.
 * All rights reserved.
 *
 * License: one of 'Cavium License' or 'GNU General Public License Version 2'
 *
 * This file is provided under the terms of the Cavium License (see below)
 * or under the terms of GNU General Public License, Version 2, as
 * published by the Free Software Foundation. When using or redistributing
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 * or without modification, are permitted provided that the following
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 ***********************license end**************************************/

#include <linux/delay.h>
#include <linux/sched.h>

#include "common.h"
#include "zip_inflate.h"

static int prepare_inflate_zcmd(struct zip_operation *zip_ops,
				struct zip_state *s, union zip_inst_s *zip_cmd)
{
	union zip_zres_s *result_ptr = &s->result;

	memset(zip_cmd, 0, sizeof(s->zip_cmd));
	memset(result_ptr, 0, sizeof(s->result));

	/* IWORD#0 */

	/* Decompression History Gather list - no gather list */
	zip_cmd->s.hg = 0;
	/* For decompression, CE must be 0x0. */
	zip_cmd->s.ce = 0;
	/* For decompression, SS must be 0x0. */
	zip_cmd->s.ss = 0;
	/* For decompression, SF should always be set. */
	zip_cmd->s.sf = 1;

	/* Begin File */
	if (zip_ops->begin_file == 0)
		zip_cmd->s.bf = 0;
	else
		zip_cmd->s.bf = 1;

	zip_cmd->s.ef = 1;
	/* 0: for Deflate decompression, 3: for LZS decompression */
	zip_cmd->s.cc = zip_ops->ccode;

	/* IWORD #1*/

	/* adler checksum */
	zip_cmd->s.adlercrc32 = zip_ops->csum;

	/*
	 * HISTORYLENGTH must be 0x0 for any ZIP decompress operation.
	 * History data is added to a decompression operation via IWORD3.
	 */
	zip_cmd->s.historylength = 0;
	zip_cmd->s.ds = 0;

	/* IWORD # 8 and 9 - Output pointer */
	zip_cmd->s.out_ptr_addr.s.addr  = __pa(zip_ops->output);
	zip_cmd->s.out_ptr_ctl.s.length = zip_ops->output_len;

	/* Maximum number of output-stream bytes that can be written */
	zip_cmd->s.totaloutputlength    = zip_ops->output_len;

	zip_dbg("Data Direct Input case ");

	/* IWORD # 6 and 7 - input pointer */
	zip_cmd->s.dg = 0;
	zip_cmd->s.inp_ptr_addr.s.addr  = __pa((u8 *)zip_ops->input);
	zip_cmd->s.inp_ptr_ctl.s.length = zip_ops->input_len;

	/* IWORD # 10 and 11 - Result pointer */
	zip_cmd->s.res_ptr_addr.s.addr = __pa(result_ptr);

	/* Clearing completion code */
	result_ptr->s.compcode = 0;

	/* Returning 0 for time being.*/
	return 0;
}

/**
 * zip_inflate - API to offload inflate operation to hardware
 * @zip_ops: Pointer to zip operation structure
 * @s:       Pointer to the structure representing zip state
 * @zip_dev: Pointer to zip device structure
 *
 * This function prepares the zip inflate command and submits it to the zip
 * engine for processing.
 *
 * Return: 0 if successful or error code
 */
int zip_inflate(struct zip_operation *zip_ops, struct zip_state *s,
		struct zip_device *zip_dev)
{
	union zip_inst_s *zip_cmd    = &s->zip_cmd;
	union zip_zres_s  *result_ptr = &s->result;
	u32 queue;

	/* Prepare inflate zip command */
	prepare_inflate_zcmd(zip_ops, s, zip_cmd);

	atomic64_add(zip_ops->input_len, &zip_dev->stats.decomp_in_bytes);

	/* Load inflate command to zip queue and ring the doorbell */
	queue = zip_load_instr(zip_cmd, zip_dev);

	/* Decompression requests submitted stats update */
	atomic64_inc(&zip_dev->stats.decomp_req_submit);

	/* Wait for completion or error */
	zip_poll_result(result_ptr);

	/* Decompression requests completed stats update */
	atomic64_inc(&zip_dev->stats.decomp_req_complete);

	zip_ops->compcode = result_ptr->s.compcode;
	switch (zip_ops->compcode) {
	case ZIP_CMD_NOTDONE:
		zip_dbg("Zip Instruction not yet completed\n");
		return ZIP_ERROR;

	case ZIP_CMD_SUCCESS:
		zip_dbg("Zip Instruction completed successfully\n");
		break;

	case ZIP_CMD_DYNAMIC_STOP:
		zip_dbg(" Dynamic stop Initiated\n");
		break;

	default:
		zip_dbg("Instruction failed. Code = %d\n", zip_ops->compcode);
		atomic64_inc(&zip_dev->stats.decomp_bad_reqs);
		zip_update_cmd_bufs(zip_dev, queue);
		return ZIP_ERROR;
	}

	zip_update_cmd_bufs(zip_dev, queue);

	if ((zip_ops->ccode == 3) && (zip_ops->flush == 4) &&
	    (zip_ops->compcode != ZIP_CMD_DYNAMIC_STOP))
		result_ptr->s.ef = 1;

	zip_ops->csum = result_ptr->s.adler32;

	atomic64_add(result_ptr->s.totalbyteswritten,
		     &zip_dev->stats.decomp_out_bytes);

	if (zip_ops->output_len < result_ptr->s.totalbyteswritten) {
		zip_err("output_len (%d) < total bytes written (%d)\n",
			zip_ops->output_len, result_ptr->s.totalbyteswritten);
		zip_ops->output_len = 0;
	} else {
		zip_ops->output_len = result_ptr->s.totalbyteswritten;
	}

	zip_ops->bytes_read = result_ptr->s.totalbytesread;
	zip_ops->bits_processed = result_ptr->s.totalbitsprocessed;
	zip_ops->end_file = result_ptr->s.ef;
	if (zip_ops->end_file) {
		switch (zip_ops->format) {
		case RAW_FORMAT:
			zip_dbg("RAW Format: %d ", zip_ops->format);
			/* Get checksum from engine */
			zip_ops->csum = result_ptr->s.adler32;
			break;

		case ZLIB_FORMAT:
			zip_dbg("ZLIB Format: %d ", zip_ops->format);
			zip_ops->csum = result_ptr->s.adler32;
			break;

		case GZIP_FORMAT:
			zip_dbg("GZIP Format: %d ", zip_ops->format);
			zip_ops->csum = result_ptr->s.crc32;
			break;

		case LZS_FORMAT:
			zip_dbg("LZS Format: %d ", zip_ops->format);
			break;

		default:
			zip_err("Format error:%d\n", zip_ops->format);
		}
	}

	return 0;
}