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[RSLIB] Support non-canonical GF representations

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For the CAFÉ NAND controller, we need to support non-canonical 
representations of the Galois field. Allow the caller to provide its own 
function for generating the field, and CAFÉ can use rslib instead of its
own implementation.

Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Segher Boessenkool
2007-05-02 12:18:41 +02:00
committed by David Woodhouse
parent 7c96b7a146
commit d7e5a5462f
2 changed files with 73 additions and 15 deletions
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4
include/linux/rslib.h
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@@ -34,6 +34,7 @@
* @prim: Primitive element, index form
* @iprim: prim-th root of 1, index form
* @gfpoly: The primitive generator polynominal
* @gffunc: Function to generate the field, if non-canonical representation
* @users: Users of this structure
* @list: List entry for the rs control list
*/
@@ -48,6 +49,7 @@ struct rs_control {
int prim;
int iprim;
int gfpoly;
int (*gffunc)(int);
int users;
struct list_head list;
};
@@ -77,6 +79,8 @@ int decode_rs16(struct rs_control *rs, uint16_t *data, uint16_t *par, int len,
/* Create or get a matching rs control structure */
struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
int nroots);
struct rs_control *init_rs_non_canonical(int symsize, int (*func)(int),
int fcr, int prim, int nroots);
/* Release a rs control structure */
void free_rs(struct rs_control *rs);