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/*
* Driver frontend for IBM Power 842 compression accelerator
*
* Copyright (C) 2015 Dan Streetman, IBM Corp
*
* Designer of the Power data compression engine:
* Bulent Abali <abali@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include "nx-842.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors");
/**
* nx842_constraints
*
* This provides the driver's constraints. Different nx842 implementations
* may have varying requirements. The constraints are:
* @alignment: All buffers should be aligned to this
* @multiple: All buffer lengths should be a multiple of this
* @minimum: Buffer lengths must not be less than this amount
* @maximum: Buffer lengths must not be more than this amount
*
* The constraints apply to all buffers and lengths, both input and output,
* for both compression and decompression, except for the minimum which
* only applies to compression input and decompression output; the
* compressed data can be less than the minimum constraint. It can be
* assumed that compressed data will always adhere to the multiple
* constraint.
*
* The driver may succeed even if these constraints are violated;
* however the driver can return failure or suffer reduced performance
* if any constraint is not met.
*/
int nx842_constraints(struct nx842_constraints *c)
{
memcpy(c, nx842_platform_driver()->constraints, sizeof(*c));
return 0;
}
EXPORT_SYMBOL_GPL(nx842_constraints);
int nx842_compress(const unsigned char *in, unsigned int ilen,
unsigned char *out, unsigned int *olen, void *wmem)
{
return nx842_platform_driver()->compress(in, ilen, out, olen, wmem);
}
EXPORT_SYMBOL_GPL(nx842_compress);
int nx842_decompress(const unsigned char *in, unsigned int ilen,
unsigned char *out, unsigned int *olen, void *wmem)
{
return nx842_platform_driver()->decompress(in, ilen, out, olen, wmem);
}
EXPORT_SYMBOL_GPL(nx842_decompress);
static __init int nx842_init(void)
{
request_module("nx-compress-powernv");
request_module("nx-compress-pseries");
/* we prevent loading if there's no platform driver, and we get the
* module that set it so it won't unload, so we don't need to check
* if it's set in any of the above functions
*/
if (!nx842_platform_driver_get()) {
pr_err("no nx842 driver found.\n");
return -ENODEV;
}
return 0;
}
module_init(nx842_init);
static void __exit nx842_exit(void)
{
nx842_platform_driver_put();
}
module_exit(nx842_exit);
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