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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"
#define MODULE_NAME "nx-compress"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors");
/* Only one driver is expected, based on the HW platform */
static struct nx842_driver *nx842_driver;
static DEFINE_SPINLOCK(nx842_driver_lock); /* protects driver pointers */
void nx842_register_driver(struct nx842_driver *driver)
{
spin_lock(&nx842_driver_lock);
if (nx842_driver) {
pr_err("can't register driver %s, already using driver %s\n",
driver->owner->name, nx842_driver->owner->name);
} else {
pr_info("registering driver %s\n", driver->owner->name);
nx842_driver = driver;
}
spin_unlock(&nx842_driver_lock);
}
EXPORT_SYMBOL_GPL(nx842_register_driver);
void nx842_unregister_driver(struct nx842_driver *driver)
{
spin_lock(&nx842_driver_lock);
if (nx842_driver == driver) {
pr_info("unregistering driver %s\n", driver->owner->name);
nx842_driver = NULL;
} else if (nx842_driver) {
pr_err("can't unregister driver %s, using driver %s\n",
driver->owner->name, nx842_driver->owner->name);
} else {
pr_err("can't unregister driver %s, no driver in use\n",
driver->owner->name);
}
spin_unlock(&nx842_driver_lock);
}
EXPORT_SYMBOL_GPL(nx842_unregister_driver);
static struct nx842_driver *get_driver(void)
{
struct nx842_driver *driver = NULL;
spin_lock(&nx842_driver_lock);
driver = nx842_driver;
if (driver && !try_module_get(driver->owner))
driver = NULL;
spin_unlock(&nx842_driver_lock);
return driver;
}
static void put_driver(struct nx842_driver *driver)
{
module_put(driver->owner);
}
int nx842_compress(const unsigned char *in, unsigned int in_len,
unsigned char *out, unsigned int *out_len,
void *wrkmem)
{
struct nx842_driver *driver = get_driver();
int ret;
if (!driver)
return -ENODEV;
ret = driver->compress(in, in_len, out, out_len, wrkmem);
put_driver(driver);
return ret;
}
EXPORT_SYMBOL_GPL(nx842_compress);
int nx842_decompress(const unsigned char *in, unsigned int in_len,
unsigned char *out, unsigned int *out_len,
void *wrkmem)
{
struct nx842_driver *driver = get_driver();
int ret;
if (!driver)
return -ENODEV;
ret = driver->decompress(in, in_len, out, out_len, wrkmem);
put_driver(driver);
return ret;
}
EXPORT_SYMBOL_GPL(nx842_decompress);
static __init int nx842_init(void)
{
pr_info("loading\n");
if (of_find_compatible_node(NULL, NULL, NX842_PSERIES_COMPAT_NAME))
request_module_nowait(NX842_PSERIES_MODULE_NAME);
else
pr_err("no nx842 driver found.\n");
pr_info("loaded\n");
return 0;
}
module_init(nx842_init);
static void __exit nx842_exit(void)
{
pr_info("NX842 unloaded\n");
}
module_exit(nx842_exit);
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