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authorMiquel Raynal <miquel.raynal@bootlin.com>2021-05-05 23:37:43 +0200
committerMiquel Raynal <miquel.raynal@bootlin.com>2021-05-26 10:43:59 +0200
commite32df79f19c756f072bd517ece65df1efd496f95 (patch)
tree8fabd205d8a89f0fe7516812cd6afe5b6ecc400b /drivers/mtd
parent09cdb237c3c8773921a7c265ce1cdd23818a3f14 (diff)
downloadlinux-e32df79f19c756f072bd517ece65df1efd496f95.tar.bz2
mtd: rawnand: Add a helper to find the closest ONFI NV-DDR mode
Introduce a similar helper to onfi_find_closest_sdr_mode(), but for NV-DDR timings. It just takes a timing structure as parameter and returns the closest mode by comparing all minimum timings. This is useful for rigid controllers on which tuning the timings is not possible. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-16-miquel.raynal@bootlin.com
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/raw/internals.h2
-rw-r--r--drivers/mtd/nand/raw/nand_timings.c42
2 files changed, 44 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/internals.h b/drivers/mtd/nand/raw/internals.h
index 012876e14317..c06bc2f1aaa2 100644
--- a/drivers/mtd/nand/raw/internals.h
+++ b/drivers/mtd/nand/raw/internals.h
@@ -90,6 +90,8 @@ void onfi_fill_interface_config(struct nand_chip *chip,
unsigned int timing_mode);
unsigned int
onfi_find_closest_sdr_mode(const struct nand_sdr_timings *spec_timings);
+unsigned int
+onfi_find_closest_nvddr_mode(const struct nand_nvddr_timings *spec_timings);
int nand_choose_best_sdr_timings(struct nand_chip *chip,
struct nand_interface_config *iface,
struct nand_sdr_timings *spec_timings);
diff --git a/drivers/mtd/nand/raw/nand_timings.c b/drivers/mtd/nand/raw/nand_timings.c
index 8eaa132c3900..7b41afc372d2 100644
--- a/drivers/mtd/nand/raw/nand_timings.c
+++ b/drivers/mtd/nand/raw/nand_timings.c
@@ -601,6 +601,48 @@ onfi_find_closest_sdr_mode(const struct nand_sdr_timings *spec_timings)
}
/**
+ * onfi_find_closest_nvddr_mode - Derive the closest ONFI NVDDR timing mode
+ * given a set of timings
+ * @spec_timings: the timings to challenge
+ */
+unsigned int
+onfi_find_closest_nvddr_mode(const struct nand_nvddr_timings *spec_timings)
+{
+ const struct nand_nvddr_timings *onfi_timings;
+ int mode;
+
+ for (mode = ARRAY_SIZE(onfi_nvddr_timings) - 1; mode > 0; mode--) {
+ onfi_timings = &onfi_nvddr_timings[mode].timings.nvddr;
+
+ if (spec_timings->tCCS_min <= onfi_timings->tCCS_min &&
+ spec_timings->tAC_min <= onfi_timings->tAC_min &&
+ spec_timings->tADL_min <= onfi_timings->tADL_min &&
+ spec_timings->tCAD_min <= onfi_timings->tCAD_min &&
+ spec_timings->tCAH_min <= onfi_timings->tCAH_min &&
+ spec_timings->tCALH_min <= onfi_timings->tCALH_min &&
+ spec_timings->tCALS_min <= onfi_timings->tCALS_min &&
+ spec_timings->tCAS_min <= onfi_timings->tCAS_min &&
+ spec_timings->tCEH_min <= onfi_timings->tCEH_min &&
+ spec_timings->tCH_min <= onfi_timings->tCH_min &&
+ spec_timings->tCK_min <= onfi_timings->tCK_min &&
+ spec_timings->tCS_min <= onfi_timings->tCS_min &&
+ spec_timings->tDH_min <= onfi_timings->tDH_min &&
+ spec_timings->tDQSCK_min <= onfi_timings->tDQSCK_min &&
+ spec_timings->tDQSD_min <= onfi_timings->tDQSD_min &&
+ spec_timings->tDS_min <= onfi_timings->tDS_min &&
+ spec_timings->tDSC_min <= onfi_timings->tDSC_min &&
+ spec_timings->tRHW_min <= onfi_timings->tRHW_min &&
+ spec_timings->tRR_min <= onfi_timings->tRR_min &&
+ spec_timings->tWHR_min <= onfi_timings->tWHR_min &&
+ spec_timings->tWRCK_min <= onfi_timings->tWRCK_min &&
+ spec_timings->tWW_min <= onfi_timings->tWW_min)
+ return mode;
+ }
+
+ return 0;
+}
+
+/*
* onfi_fill_sdr_interface_config - Initialize a SDR interface config from a
* given ONFI mode
* @chip: The NAND chip