mtd: nand: add ONFI timing mode to nand_timings converter

Add a converter to retrieve NAND timings from an ONFI NAND timing mode.
At the moment, only SDR NAND timings are supported.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/nand/Makefile

@@ -50,4 +50,4 @@ obj-$(CONFIG_MTD_NAND_GPMI_NAND)	+= gpmi-nand/
 obj-$(CONFIG_MTD_NAND_XWAY)		+= xway_nand.o
 obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH)	+= bcm47xxnflash/
 
-nand-objs := nand_base.o nand_bbt.o
+nand-objs := nand_base.o nand_bbt.o nand_timings.o

drivers/mtd/nand/nand_timings.c

@@ -0,0 +1,253 @@
+/*
+ *  Copyright (C) 2014 Free Electrons
+ *
+ *  Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/mtd/nand.h>
+
+static const struct nand_sdr_timings onfi_sdr_timings[] = {
+	/* Mode 0 */
+	{
+		.tADL_min = 200000,
+		.tALH_min = 20000,
+		.tALS_min = 50000,
+		.tAR_min = 25000,
+		.tCEA_max = 100000,
+		.tCEH_min = 20000,
+		.tCH_min = 20000,
+		.tCHZ_max = 100000,
+		.tCLH_min = 20000,
+		.tCLR_min = 20000,
+		.tCLS_min = 50000,
+		.tCOH_min = 0,
+		.tCS_min = 70000,
+		.tDH_min = 20000,
+		.tDS_min = 40000,
+		.tFEAT_max = 1000000,
+		.tIR_min = 10000,
+		.tITC_max = 1000000,
+		.tRC_min = 100000,
+		.tREA_max = 40000,
+		.tREH_min = 30000,
+		.tRHOH_min = 0,
+		.tRHW_min = 200000,
+		.tRHZ_max = 200000,
+		.tRLOH_min = 0,
+		.tRP_min = 50000,
+		.tRST_max = 250000000000,
+		.tWB_max = 200000,
+		.tRR_min = 40000,
+		.tWC_min = 100000,
+		.tWH_min = 30000,
+		.tWHR_min = 120000,
+		.tWP_min = 50000,
+		.tWW_min = 100000,
+	},
+	/* Mode 1 */
+	{
+		.tADL_min = 100000,
+		.tALH_min = 10000,
+		.tALS_min = 25000,
+		.tAR_min = 10000,
+		.tCEA_max = 45000,
+		.tCEH_min = 20000,
+		.tCH_min = 10000,
+		.tCHZ_max = 50000,
+		.tCLH_min = 10000,
+		.tCLR_min = 10000,
+		.tCLS_min = 25000,
+		.tCOH_min = 15000,
+		.tCS_min = 35000,
+		.tDH_min = 10000,
+		.tDS_min = 20000,
+		.tFEAT_max = 1000000,
+		.tIR_min = 0,
+		.tITC_max = 1000000,
+		.tRC_min = 50000,
+		.tREA_max = 30000,
+		.tREH_min = 15000,
+		.tRHOH_min = 15000,
+		.tRHW_min = 100000,
+		.tRHZ_max = 100000,
+		.tRLOH_min = 0,
+		.tRP_min = 25000,
+		.tRR_min = 20000,
+		.tRST_max = 500000000,
+		.tWB_max = 100000,
+		.tWC_min = 45000,
+		.tWH_min = 15000,
+		.tWHR_min = 80000,
+		.tWP_min = 25000,
+		.tWW_min = 100000,
+	},
+	/* Mode 2 */
+	{
+		.tADL_min = 100000,
+		.tALH_min = 10000,
+		.tALS_min = 15000,
+		.tAR_min = 10000,
+		.tCEA_max = 30000,
+		.tCEH_min = 20000,
+		.tCH_min = 10000,
+		.tCHZ_max = 50000,
+		.tCLH_min = 10000,
+		.tCLR_min = 10000,
+		.tCLS_min = 15000,
+		.tCOH_min = 15000,
+		.tCS_min = 25000,
+		.tDH_min = 5000,
+		.tDS_min = 15000,
+		.tFEAT_max = 1000000,
+		.tIR_min = 0,
+		.tITC_max = 1000000,
+		.tRC_min = 35000,
+		.tREA_max = 25000,
+		.tREH_min = 15000,
+		.tRHOH_min = 15000,
+		.tRHW_min = 100000,
+		.tRHZ_max = 100000,
+		.tRLOH_min = 0,
+		.tRR_min = 20000,
+		.tRST_max = 500000000,
+		.tWB_max = 100000,
+		.tRP_min = 17000,
+		.tWC_min = 35000,
+		.tWH_min = 15000,
+		.tWHR_min = 80000,
+		.tWP_min = 17000,
+		.tWW_min = 100000,
+	},
+	/* Mode 3 */
+	{
+		.tADL_min = 100000,
+		.tALH_min = 5000,
+		.tALS_min = 10000,
+		.tAR_min = 10000,
+		.tCEA_max = 25000,
+		.tCEH_min = 20000,
+		.tCH_min = 5000,
+		.tCHZ_max = 50000,
+		.tCLH_min = 5000,
+		.tCLR_min = 10000,
+		.tCLS_min = 10000,
+		.tCOH_min = 15000,
+		.tCS_min = 25000,
+		.tDH_min = 5000,
+		.tDS_min = 10000,
+		.tFEAT_max = 1000000,
+		.tIR_min = 0,
+		.tITC_max = 1000000,
+		.tRC_min = 30000,
+		.tREA_max = 20000,
+		.tREH_min = 10000,
+		.tRHOH_min = 15000,
+		.tRHW_min = 100000,
+		.tRHZ_max = 100000,
+		.tRLOH_min = 0,
+		.tRP_min = 15000,
+		.tRR_min = 20000,
+		.tRST_max = 500000000,
+		.tWB_max = 100000,
+		.tWC_min = 30000,
+		.tWH_min = 10000,
+		.tWHR_min = 80000,
+		.tWP_min = 15000,
+		.tWW_min = 100000,
+	},
+	/* Mode 4 */
+	{
+		.tADL_min = 70000,
+		.tALH_min = 5000,
+		.tALS_min = 10000,
+		.tAR_min = 10000,
+		.tCEA_max = 25000,
+		.tCEH_min = 20000,
+		.tCH_min = 5000,
+		.tCHZ_max = 30000,
+		.tCLH_min = 5000,
+		.tCLR_min = 10000,
+		.tCLS_min = 10000,
+		.tCOH_min = 15000,
+		.tCS_min = 20000,
+		.tDH_min = 5000,
+		.tDS_min = 10000,
+		.tFEAT_max = 1000000,
+		.tIR_min = 0,
+		.tITC_max = 1000000,
+		.tRC_min = 25000,
+		.tREA_max = 20000,
+		.tREH_min = 10000,
+		.tRHOH_min = 15000,
+		.tRHW_min = 100000,
+		.tRHZ_max = 100000,
+		.tRLOH_min = 5000,
+		.tRP_min = 12000,
+		.tRR_min = 20000,
+		.tRST_max = 500000000,
+		.tWB_max = 100000,
+		.tWC_min = 25000,
+		.tWH_min = 10000,
+		.tWHR_min = 80000,
+		.tWP_min = 12000,
+		.tWW_min = 100000,
+	},
+	/* Mode 5 */
+	{
+		.tADL_min = 70000,
+		.tALH_min = 5000,
+		.tALS_min = 10000,
+		.tAR_min = 10000,
+		.tCEA_max = 25000,
+		.tCEH_min = 20000,
+		.tCH_min = 5000,
+		.tCHZ_max = 30000,
+		.tCLH_min = 5000,
+		.tCLR_min = 10000,
+		.tCLS_min = 10000,
+		.tCOH_min = 15000,
+		.tCS_min = 15000,
+		.tDH_min = 5000,
+		.tDS_min = 7000,
+		.tFEAT_max = 1000000,
+		.tIR_min = 0,
+		.tITC_max = 1000000,
+		.tRC_min = 20000,
+		.tREA_max = 16000,
+		.tREH_min = 7000,
+		.tRHOH_min = 15000,
+		.tRHW_min = 100000,
+		.tRHZ_max = 100000,
+		.tRLOH_min = 5000,
+		.tRP_min = 10000,
+		.tRR_min = 20000,
+		.tRST_max = 500000000,
+		.tWB_max = 100000,
+		.tWC_min = 20000,
+		.tWH_min = 7000,
+		.tWHR_min = 80000,
+		.tWP_min = 10000,
+		.tWW_min = 100000,
+	},
+};
+
+/**
+ * onfi_async_timing_mode_to_sdr_timings - [NAND Interface] Retrieve NAND
+ * timings according to the given ONFI timing mode
+ * @mode: ONFI timing mode
+ */
+const struct nand_sdr_timings *onfi_async_timing_mode_to_sdr_timings(int mode)
+{
+	if (mode < 0 || mode >= ARRAY_SIZE(onfi_sdr_timings))
+		return ERR_PTR(-EINVAL);
+
+	return &onfi_sdr_timings[mode];
+}
+EXPORT_SYMBOL(onfi_async_timing_mode_to_sdr_timings);

include/linux/mtd/nand.h

@@ -997,4 +997,7 @@ struct nand_sdr_timings {
 	u32 tWP_min;
 	u32 tWW_min;
 };
+
+/* get timing characteristics from ONFI timing mode. */
+const struct nand_sdr_timings *onfi_async_timing_mode_to_sdr_timings(int mode);
 #endif /* __LINUX_MTD_NAND_H */