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authorMasahiro Yamada <yamada.masahiro@socionext.com>2017-06-07 14:52:11 +0300
committerBoris Brezillon <boris.brezillon@free-electrons.com>2017-06-10 14:40:10 +0300
commita03c60178c181767ecfb26fb311a88742d228118 (patch)
tree1111a80b5cbe430ad8dbe34764c64b9a39c0c05e /include/linux/mtd
parent2c8f8afa7f92acb07641bf95b940d384ed1d0294 (diff)
downloadlinux-a03c60178c181767ecfb26fb311a88742d228118.tar.xz
mtd: nand: add a shorthand to generate nand_ecc_caps structure
struct nand_ecc_caps was designed as flexible as possible to support multiple stepsizes (like sunxi_nand.c). So, we need to write multiple arrays even for the simplest case. I guess many controllers support a single stepsize, so here is a shorthand macro for the case. It allows to describe like ... NAND_ECC_CAPS_SINGLE(denali_pci_ecc_caps, denali_calc_ecc_bytes, 512, 8, 15); ... instead of static const int denali_pci_ecc_strengths[] = {8, 15}; static const struct nand_ecc_step_info denali_pci_ecc_stepinfo = { .stepsize = 512, .strengths = denali_pci_ecc_strengths, .nstrengths = ARRAY_SIZE(denali_pci_ecc_strengths), }; static const struct nand_ecc_caps denali_pci_ecc_caps = { .stepinfos = &denali_pci_ecc_stepinfo, .nstepinfos = 1, .calc_ecc_bytes = denali_calc_ecc_bytes, }; Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'include/linux/mtd')
-rw-r--r--include/linux/mtd/nand.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 568f53e812cd..dc8fbc033442 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -505,6 +505,20 @@ struct nand_ecc_caps {
int (*calc_ecc_bytes)(int step_size, int strength);
};
+/* a shorthand to generate struct nand_ecc_caps with only one ECC stepsize */
+#define NAND_ECC_CAPS_SINGLE(__name, __calc, __step, ...) \
+static const int __name##_strengths[] = { __VA_ARGS__ }; \
+static const struct nand_ecc_step_info __name##_stepinfo = { \
+ .stepsize = __step, \
+ .strengths = __name##_strengths, \
+ .nstrengths = ARRAY_SIZE(__name##_strengths), \
+}; \
+static const struct nand_ecc_caps __name = { \
+ .stepinfos = &__name##_stepinfo, \
+ .nstepinfos = 1, \
+ .calc_ecc_bytes = __calc, \
+}
+
/**
* struct nand_ecc_ctrl - Control structure for ECC
* @mode: ECC mode