started nand driver for spl

u-boot-tree/drivers/mtd/nand/Makefile

@@ -15,6 +15,7 @@ obj-$(CONFIG_SPL_NAND_AM33XX_BCH) += am335x_spl_bch.o
 obj-$(CONFIG_SPL_NAND_DENALI) += denali_spl.o
 obj-$(CONFIG_SPL_NAND_DOCG4) += docg4_spl.o
 obj-$(CONFIG_SPL_NAND_SIMPLE) += nand_spl_simple.o
+obj-$(CONFIG_SPL_NAND_ELPHEL393) += elphel393_nand_spl.o
 obj-$(CONFIG_SPL_NAND_LOAD) += nand_spl_load.o
 obj-$(CONFIG_SPL_NAND_ECC) += nand_ecc.o
 obj-$(CONFIG_SPL_NAND_BASE) += nand_base.o

u-boot-tree/drivers/mtd/nand/elphel393_nand_spl.c

+/*
+ * Xilinx Zynq NAND Flash Controller Driver
+ * This driver is based on plat_nand.c and mxc_nand.c drivers
+ *
+ * Copyright (C) 2009 - 2013 Xilinx, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <nand.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/nand_ecc.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/sys_proto.h>
+
+/* The NAND flash driver defines */
+#define ZYNQ_NAND_CMD_PHASE	1	/* End command valid in command phase */
+#define ZYNQ_NAND_DATA_PHASE	2	/* End command valid in data phase */
+#define ZYNQ_NAND_ECC_SIZE	512	/* Size of data for ECC operation */
+
+/* Flash memory controller operating parameters */
+#define ZYNQ_NAND_CLR_CONFIG	((0x1 << 1)  |	/* Disable interrupt */ \
+				(0x1 << 4)   |	/* Clear interrupt */ \
+				(0x1 << 6))	/* Disable ECC interrupt */
+
+/* Assuming 50MHz clock (20ns cycle time) and 3V operation */
+#define ZYNQ_NAND_SET_CYCLES	((0x2 << 20) |	/* t_rr from nand_cycles */ \
+				(0x2 << 17)  |	/* t_ar from nand_cycles */ \
+				(0x1 << 14)  |	/* t_clr from nand_cycles */ \
+				(0x3 << 11)  |	/* t_wp from nand_cycles */ \
+				(0x2 << 8)   |	/* t_rea from nand_cycles */ \
+				(0x5 << 4)   |	/* t_wc from nand_cycles */ \
+				(0x5 << 0))	/* t_rc from nand_cycles */
+
+#define ZYNQ_NAND_SET_OPMODE	0x0
+
+#define ZYNQ_NAND_DIRECT_CMD	((0x4 << 23) |	/* Chip 0 from interface 1 */ \
+				(0x2 << 21))	/* UpdateRegs operation */
+
+#define ZYNQ_NAND_ECC_CONFIG	((0x1 << 2)  |	/* ECC available on APB */ \
+				(0x1 << 4)   |	/* ECC read at end of page */ \
+				(0x0 << 5))	/* No Jumping */
+
+#define ZYNQ_NAND_ECC_CMD1	((0x80)      |	/* Write command */ \
+				(0x00 << 8)  |	/* Read command */ \
+				(0x30 << 16) |	/* Read End command */ \
+				(0x1 << 24))	/* Read End command calid */
+
+#define ZYNQ_NAND_ECC_CMD2	((0x85)      |	/* Write col change cmd */ \
+				(0x05 << 8)  |	/* Read col change cmd */ \
+				(0xE0 << 16) |	/* Read col change end cmd */ \
+				(0x1 << 24))	/* Read col change
+							end cmd valid */
+/* AXI Address definitions */
+#define START_CMD_SHIFT		3
+#define END_CMD_SHIFT		11
+#define END_CMD_VALID_SHIFT	20
+#define ADDR_CYCLES_SHIFT	21
+#define CLEAR_CS_SHIFT		21
+#define ECC_LAST_SHIFT		10
+#define COMMAND_PHASE		(0 << 19)
+#define DATA_PHASE		(1 << 19)
+
+#define ZYNQ_NAND_ECC_LAST	(1 << ECC_LAST_SHIFT)	/* Set ECC_Last */
+#define ZYNQ_NAND_CLEAR_CS	(1 << CLEAR_CS_SHIFT)	/* Clear chip select */
+
+/* ECC block registers bit position and bit mask */
+#define ZYNQ_NAND_ECC_BUSY	(1 << 6)	/* ECC block is busy */
+#define ZYNQ_NAND_ECC_MASK	0x00FFFFFF	/* ECC value mask */
+
+#define ZYNQ_NAND_ROW_ADDR_CYCL_MASK	0x0F
+#define ZYNQ_NAND_COL_ADDR_CYCL_MASK	0xF0
+
+/* NAND MIO buswidth count*/
+#define ZYNQ_NAND_MIO_NUM_NAND_8BIT	13
+#define ZYNQ_NAND_MIO_NUM_NAND_16BIT	8
+
+/* Based on Fabian Gottlieb von Bellingshausen's work in Antarctica */
+int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst)
+{
+	return 0;
+}
+
+/* nand_init() - initialize data to make nand usable by SPL */
+void nand_init(void)
+{
+	
+}
+
+/* secret */
+void nand_deselect(void) {
+	
+}
+