-/*
+/*
* lib/reed_solomon/rslib.c
*
* Overview:
* Generic Reed Solomon encoder / decoder library
- *
+ *
* Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de)
*
* Reed Solomon code lifted from reed solomon library written by Phil Karn
* Copyright 2002 Phil Karn, KA9Q
*
- * $Id: rslib.c,v 1.5 2004/10/22 15:41:47 gleixner Exp $
+ * $Id: rslib.c,v 1.7 2005/11/07 11:14:59 gleixner Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Description:
- *
+ *
* The generic Reed Solomon library provides runtime configurable
* encoding / decoding of RS codes.
* Each user must call init_rs to get a pointer to a rs_control
* If a structure is generated then the polynomial arrays for
* fast encoding / decoding are built. This can take some time so
* make sure not to call this function from a time critical path.
- * Usually a module / driver should initialize the necessary
+ * Usually a module / driver should initialize the necessary
* rs_control structure on module / driver init and release it
* on exit.
- * The encoding puts the calculated syndrome into a given syndrome
- * buffer.
+ * The encoding puts the calculated syndrome into a given syndrome
+ * buffer.
* The decoding is a two step process. The first step calculates
* the syndrome over the received (data + syndrome) and calls the
* second stage, which does the decoding / error correction itself.
#include <linux/module.h>
#include <linux/rslib.h>
#include <linux/slab.h>
+#include <linux/mutex.h>
#include <asm/semaphore.h>
/* This list holds all currently allocated rs control structures */
static LIST_HEAD (rslist);
/* Protection for the list */
-static DECLARE_MUTEX(rslistlock);
+static DEFINE_MUTEX(rslistlock);
-/**
+/**
* rs_init - Initialize a Reed-Solomon codec
*
* @symsize: symbol size, bits (1-8)
* Allocate a control structure and the polynom arrays for faster
* en/decoding. Fill the arrays according to the given parameters
*/
-static struct rs_control *rs_init(int symsize, int gfpoly, int fcr,
+static struct rs_control *rs_init(int symsize, int gfpoly, int fcr,
int prim, int nroots)
{
struct rs_control *rs;
/* Multiply rs->genpoly[] by @**(root + x) */
for (j = i; j > 0; j--) {
if (rs->genpoly[j] != 0) {
- rs->genpoly[j] = rs->genpoly[j -1] ^
- rs->alpha_to[rs_modnn(rs,
+ rs->genpoly[j] = rs->genpoly[j -1] ^
+ rs->alpha_to[rs_modnn(rs,
rs->index_of[rs->genpoly[j]] + root)];
} else
rs->genpoly[j] = rs->genpoly[j - 1];
}
/* rs->genpoly[0] can never be zero */
- rs->genpoly[0] =
- rs->alpha_to[rs_modnn(rs,
+ rs->genpoly[0] =
+ rs->alpha_to[rs_modnn(rs,
rs->index_of[rs->genpoly[0]] + root)];
}
/* convert rs->genpoly[] to index form for quicker encoding */
}
-/**
+/**
* free_rs - Free the rs control structure, if its not longer used
*
* @rs: the control structure which is not longer used by the
*/
void free_rs(struct rs_control *rs)
{
- down(&rslistlock);
+ mutex_lock(&rslistlock);
rs->users--;
if(!rs->users) {
list_del(&rs->list);
kfree(rs->genpoly);
kfree(rs);
}
- up(&rslistlock);
+ mutex_unlock(&rslistlock);
}
-/**
+/**
* init_rs - Find a matching or allocate a new rs control structure
*
* @symsize: the symbol size (number of bits)
* @gfpoly: the extended Galois field generator polynomial coefficients,
* with the 0th coefficient in the low order bit. The polynomial
* must be primitive;
- * @fcr: the first consecutive root of the rs code generator polynomial
+ * @fcr: the first consecutive root of the rs code generator polynomial
* in index form
* @prim: primitive element to generate polynomial roots
* @nroots: RS code generator polynomial degree (number of roots)
*/
-struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
+struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
int nroots)
{
struct list_head *tmp;
return NULL;
if (prim <= 0 || prim >= (1<<symsize))
return NULL;
- if (nroots < 0 || nroots >= (1<<symsize) || nroots > 8)
+ if (nroots < 0 || nroots >= (1<<symsize))
return NULL;
-
- down(&rslistlock);
+
+ mutex_lock(&rslistlock);
/* Walk through the list and look for a matching entry */
list_for_each(tmp, &rslist) {
if (gfpoly != rs->gfpoly)
continue;
if (fcr != rs->fcr)
- continue;
+ continue;
if (prim != rs->prim)
- continue;
+ continue;
if (nroots != rs->nroots)
continue;
/* We have a matching one already */
rs->users = 1;
list_add(&rs->list, &rslist);
}
-out:
- up(&rslistlock);
+out:
+ mutex_unlock(&rslistlock);
return rs;
}
#ifdef CONFIG_REED_SOLOMON_ENC8
-/**
+/**
* encode_rs8 - Calculate the parity for data values (8bit data width)
*
* @rs: the rs control structure
* @data: data field of a given type
- * @len: data length
+ * @len: data length
* @par: parity data, must be initialized by caller (usually all 0)
* @invmsk: invert data mask (will be xored on data)
*
* symbol size > 8. The calling code must take care of encoding of the
* syndrome result for storage itself.
*/
-int encode_rs8(struct rs_control *rs, uint8_t *data, int len, uint16_t *par,
+int encode_rs8(struct rs_control *rs, uint8_t *data, int len, uint16_t *par,
uint16_t invmsk)
{
#include "encode_rs.c"
#endif
#ifdef CONFIG_REED_SOLOMON_DEC8
-/**
+/**
* decode_rs8 - Decode codeword (8bit data width)
*
* @rs: the rs control structure
* syndrome result and the received parity before calling this code.
*/
int decode_rs8(struct rs_control *rs, uint8_t *data, uint16_t *par, int len,
- uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
+ uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
uint16_t *corr)
{
#include "decode_rs.c"
*
* @rs: the rs control structure
* @data: data field of a given type
- * @len: data length
+ * @len: data length
* @par: parity data, must be initialized by caller (usually all 0)
* @invmsk: invert data mask (will be xored on data, not on parity!)
*
* Each field in the data array contains up to symbol size bits of valid data.
*/
-int encode_rs16(struct rs_control *rs, uint16_t *data, int len, uint16_t *par,
+int encode_rs16(struct rs_control *rs, uint16_t *data, int len, uint16_t *par,
uint16_t invmsk)
{
#include "encode_rs.c"
#endif
#ifdef CONFIG_REED_SOLOMON_DEC16
-/**
+/**
* decode_rs16 - Decode codeword (16bit data width)
*
* @rs: the rs control structure
* @s: syndrome data field (if NULL, syndrome is calculated)
* @no_eras: number of erasures
* @eras_pos: position of erasures, can be NULL
- * @invmsk: invert data mask (will be xored on data, not on parity!)
+ * @invmsk: invert data mask (will be xored on data, not on parity!)
* @corr: buffer to store correction bitmask on eras_pos
*
* Each field in the data array contains up to symbol size bits of valid data.
*/
int decode_rs16(struct rs_control *rs, uint16_t *data, uint16_t *par, int len,
- uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
+ uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
uint16_t *corr)
{
#include "decode_rs.c"
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