mtd: rawnand: Add onfi_fill_nvddr_interface_config() helper

Same logic as for the SDR path, let's create a
onfi_fill_nvddr_interface_config() helper to fill an interface
configuration structure with NV-DDR timings, given a specific ONFI mode.

There is one additional thing to do compared to SDR mode: tCAD timing
can be fast or slow and this depends on an ONFI parameter page bit. By
default the slow value is declared in the timings structure definition,
but this helper can shrink it down if necessary.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-12-miquel.raynal@bootlin.com

2 files changed, 42 insertions, 0 deletions

diff --git a/drivers/mtd/nand/raw/nand_onfi.c b/drivers/mtd/nand/raw/nand_onfi.c
index f7a4a0573fe7..8e4677f2ba76 100644
--- a/drivers/mtd/nand/raw/nand_onfi.c
+++ b/drivers/mtd/nand/raw/nand_onfi.c
@@ -315,6 +315,7 @@ int nand_onfi_detect(struct nand_chip *chip)
 	onfi->tBERS = le16_to_cpu(p->t_bers);
 	onfi->tR = le16_to_cpu(p->t_r);
 	onfi->tCCS = le16_to_cpu(p->t_ccs);
+	onfi->fast_tCAD = p->nvddr_nvddr2_features & BIT(0);
 	onfi->sdr_timing_modes = le16_to_cpu(p->sdr_timing_modes);
 	if (p->features & ONFI_FEATURE_NV_DDR)
 		onfi->nvddr_timing_modes = p->nvddr_timing_modes;
diff --git a/drivers/mtd/nand/raw/nand_timings.c b/drivers/mtd/nand/raw/nand_timings.c
index fb483e696cb9..8eaa132c3900 100644
--- a/drivers/mtd/nand/raw/nand_timings.c
+++ b/drivers/mtd/nand/raw/nand_timings.c
@@ -637,6 +637,45 @@ static void onfi_fill_sdr_interface_config(struct nand_chip *chip,
 }
 
 /**
+ * onfi_fill_nvddr_interface_config - Initialize a NVDDR interface config from a
+ *                                    given ONFI mode
+ * @chip: The NAND chip
+ * @iface: The interface configuration to fill
+ * @timing_mode: The ONFI timing mode
+ */
+static void onfi_fill_nvddr_interface_config(struct nand_chip *chip,
+					     struct nand_interface_config *iface,
+					     unsigned int timing_mode)
+{
+	struct onfi_params *onfi = chip->parameters.onfi;
+
+	if (WARN_ON(timing_mode >= ARRAY_SIZE(onfi_nvddr_timings)))
+		return;
+
+	*iface = onfi_nvddr_timings[timing_mode];
+
+	/*
+	 * Initialize timings that cannot be deduced from timing mode:
+	 * tPROG, tBERS, tR, tCCS and tCAD.
+	 * These information are part of the ONFI parameter page.
+	 */
+	if (onfi) {
+		struct nand_nvddr_timings *timings = &iface->timings.nvddr;
+
+		/* microseconds -> picoseconds */
+		timings->tPROG_max = 1000000ULL * onfi->tPROG;
+		timings->tBERS_max = 1000000ULL * onfi->tBERS;
+		timings->tR_max = 1000000ULL * onfi->tR;
+
+		/* nanoseconds -> picoseconds */
+		timings->tCCS_min = 1000UL * onfi->tCCS;
+
+		if (onfi->fast_tCAD)
+			timings->tCAD_min = 25000;
+	}
+}
+
+/**
  * onfi_fill_interface_config - Initialize an interface config from a given
  *                              ONFI mode
  * @chip: The NAND chip
@@ -651,4 +690,6 @@ void onfi_fill_interface_config(struct nand_chip *chip,
 {
 	if (type == NAND_SDR_IFACE)
 		return onfi_fill_sdr_interface_config(chip, iface, timing_mode);
+	else
+		return onfi_fill_nvddr_interface_config(chip, iface, timing_mode);
 }