[RSLIB] Support non-canonical GF representations

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>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/rslib.h b/include/linux/rslib.h
index ace25acfdc97..746580c1939c 100644
--- a/include/linux/rslib.h
+++ b/include/linux/rslib.h
@@ -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);