ARC: AXS10x: drop NAND support

On AXS10x boards we have non-standard NAND controller
which was never really used a lot as there're other much more
convenient [as they are standard & removable] persistent media
like SD-card and USB mass storage.

Moreover after recent changes we face with some NAND controller
runtime issues. So instead of keeping support of yet another
non-standard peripheral we're dropping its support for good.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

2 files changed, 0 insertions, 243 deletions

diff --git a/board/synopsys/axs10x/Makefile b/board/synopsys/axs10x/Makefile
index 340e12c..dd5ee68 100644
--- a/board/synopsys/axs10x/Makefile
+++ b/board/synopsys/axs10x/Makefile
@@ -3,4 +3,3 @@
 # Copyright (C) 2013-2016 Synopsys, Inc. All rights reserved.
 
 obj-y	+= axs10x.o
-obj-$(CONFIG_CMD_NAND) += nand.o
diff --git a/board/synopsys/axs10x/nand.c b/board/synopsys/axs10x/nand.c
deleted file mode 100644
index 8108460..0000000
--- a/board/synopsys/axs10x/nand.c
+++ /dev/null
@@ -1,242 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
- */
-
-#include <bouncebuf.h>
-#include <common.h>
-#include <malloc.h>
-#include <nand.h>
-#include <asm/io.h>
-#include "axs10x.h"
-
-DECLARE_GLOBAL_DATA_PTR;
-
-#define BUS_WIDTH	8		/* AXI data bus width in bytes	*/
-
-/* DMA buffer descriptor bits & masks */
-#define BD_STAT_OWN			(1 << 31)
-#define BD_STAT_BD_FIRST		(1 << 3)
-#define BD_STAT_BD_LAST			(1 << 2)
-#define BD_SIZES_BUFFER1_MASK		0xfff
-
-#define BD_STAT_BD_COMPLETE	(BD_STAT_BD_FIRST | BD_STAT_BD_LAST)
-
-/* Controller command flags */
-#define B_WFR		(1 << 19)	/* 1b - Wait for ready		*/
-#define B_LC		(1 << 18)	/* 1b - Last cycle		*/
-#define B_IWC		(1 << 13)	/* 1b - Interrupt when complete	*/
-
-/* NAND cycle types */
-#define B_CT_ADDRESS	(0x0 << 16)	/* Address operation		*/
-#define B_CT_COMMAND	(0x1 << 16)	/* Command operation		*/
-#define B_CT_WRITE	(0x2 << 16)	/* Write operation		*/
-#define B_CT_READ	(0x3 << 16)	/* Write operation		*/
-
-enum nand_isr_t {
-	NAND_ISR_DATAREQUIRED = 0,
-	NAND_ISR_TXUNDERFLOW,
-	NAND_ISR_TXOVERFLOW,
-	NAND_ISR_DATAAVAILABLE,
-	NAND_ISR_RXUNDERFLOW,
-	NAND_ISR_RXOVERFLOW,
-	NAND_ISR_TXDMACOMPLETE,
-	NAND_ISR_RXDMACOMPLETE,
-	NAND_ISR_DESCRIPTORUNAVAILABLE,
-	NAND_ISR_CMDDONE,
-	NAND_ISR_CMDAVAILABLE,
-	NAND_ISR_CMDERROR,
-	NAND_ISR_DATATRANSFEROVER,
-	NAND_ISR_NONE
-};
-
-enum nand_regs_t {
-	AC_FIFO = 0,		/* address and command fifo */
-	IDMAC_BDADDR = 0x18,	/* idmac descriptor list base address */
-	INT_STATUS = 0x118,	/* interrupt status register */
-	INT_CLR_STATUS = 0x120,	/* interrupt clear status register */
-};
-
-struct nand_bd {
-	uint32_t status;	/* DES0 */
-	uint32_t sizes;		/* DES1 */
-	uint32_t buffer_ptr0;	/* DES2 */
-	uint32_t buffer_ptr1;	/* DES3 */
-};
-
-#define NAND_REG_WRITE(r, v)	\
-	writel(v, (volatile void __iomem *)(CONFIG_SYS_NAND_BASE + r))
-#define NAND_REG_READ(r)		\
-	readl((const volatile void __iomem *)(CONFIG_SYS_NAND_BASE + r))
-
-static struct nand_bd *bd;	/* DMA buffer descriptors	*/
-
-/**
- * axs101_nand_write_buf -  write buffer to chip
- * @mtd:	MTD device structure
- * @buf:	data buffer
- * @len:	number of bytes to write
- */
-static uint32_t nand_flag_is_set(uint32_t flag)
-{
-	uint32_t reg = NAND_REG_READ(INT_STATUS);
-
-	if (reg & (1 << NAND_ISR_CMDERROR))
-		return 0;
-
-	if (reg & (1 << flag)) {
-		NAND_REG_WRITE(INT_CLR_STATUS, 1 << flag);
-		return 1;
-	}
-
-	return 0;
-}
-
-/**
- * axs101_nand_write_buf -  write buffer to chip
- * @mtd:	MTD device structure
- * @buf:	data buffer
- * @len:	number of bytes to write
- */
-static void axs101_nand_write_buf(struct mtd_info *mtd, const u_char *buf,
-				   int len)
-{
-	struct bounce_buffer bbstate;
-
-	bounce_buffer_start(&bbstate, (void *)buf, len, GEN_BB_READ);
-
-	/* Setup buffer descriptor */
-	writel(BD_STAT_OWN | BD_STAT_BD_COMPLETE, &bd->status);
-	writel(ALIGN(len, BUS_WIDTH) & BD_SIZES_BUFFER1_MASK, &bd->sizes);
-	writel(bbstate.bounce_buffer, &bd->buffer_ptr0);
-	writel(0, &bd->buffer_ptr1);
-
-	/* Flush modified buffer descriptor */
-	flush_dcache_range((unsigned long)bd,
-			   (unsigned long)bd + sizeof(struct nand_bd));
-
-	/* Issue "write" command */
-	NAND_REG_WRITE(AC_FIFO, B_CT_WRITE | B_WFR | B_IWC | B_LC | (len-1));
-
-	/* Wait for NAND command and DMA to complete */
-	while (!nand_flag_is_set(NAND_ISR_CMDDONE))
-		;
-	while (!nand_flag_is_set(NAND_ISR_TXDMACOMPLETE))
-		;
-
-	bounce_buffer_stop(&bbstate);
-}
-
-/**
- * axs101_nand_read_buf -  read chip data into buffer
- * @mtd:	MTD device structure
- * @buf:	buffer to store data
- * @len:	number of bytes to read
- */
-static void axs101_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
-{
-	struct bounce_buffer bbstate;
-
-	bounce_buffer_start(&bbstate, buf, len, GEN_BB_WRITE);
-
-	/* Setup buffer descriptor */
-	writel(BD_STAT_OWN | BD_STAT_BD_COMPLETE, &bd->status);
-	writel(ALIGN(len, BUS_WIDTH) & BD_SIZES_BUFFER1_MASK, &bd->sizes);
-	writel(bbstate.bounce_buffer, &bd->buffer_ptr0);
-	writel(0, &bd->buffer_ptr1);
-
-	/* Flush modified buffer descriptor */
-	flush_dcache_range((unsigned long)bd,
-			   (unsigned long)bd + sizeof(struct nand_bd));
-
-	/* Issue "read" command */
-	NAND_REG_WRITE(AC_FIFO, B_CT_READ | B_WFR | B_IWC | B_LC | (len - 1));
-
-	/* Wait for NAND command and DMA to complete */
-	while (!nand_flag_is_set(NAND_ISR_CMDDONE))
-		;
-	while (!nand_flag_is_set(NAND_ISR_RXDMACOMPLETE))
-		;
-
-	bounce_buffer_stop(&bbstate);
-}
-
-/**
- * axs101_nand_read_byte -  read one byte from the chip
- * @mtd:	MTD device structure
- */
-static u_char axs101_nand_read_byte(struct mtd_info *mtd)
-{
-	u8 byte;
-
-	axs101_nand_read_buf(mtd, (uchar *)&byte, sizeof(byte));
-	return byte;
-}
-
-/**
- * axs101_nand_read_word -  read one word from the chip
- * @mtd:	MTD device structure
- */
-static u16 axs101_nand_read_word(struct mtd_info *mtd)
-{
-	u16 word;
-
-	axs101_nand_read_buf(mtd, (uchar *)&word, sizeof(word));
-	return word;
-}
-
-/**
- * axs101_nand_hwcontrol - NAND control functions wrapper.
- * @mtd:	MTD device structure
- * @cmd:	Command
- */
-static void axs101_nand_hwcontrol(struct mtd_info *mtdinfo, int cmd,
-				   unsigned int ctrl)
-{
-	if (cmd == NAND_CMD_NONE)
-		return;
-
-	cmd = cmd & 0xff;
-
-	switch (ctrl & (NAND_ALE | NAND_CLE)) {
-	/* Address */
-	case NAND_ALE:
-		cmd |= B_CT_ADDRESS;
-		break;
-
-	/* Command */
-	case NAND_CLE:
-		cmd |= B_CT_COMMAND | B_WFR;
-
-		break;
-
-	default:
-		debug("%s: unknown ctrl %#x\n", __func__, ctrl);
-	}
-
-	NAND_REG_WRITE(AC_FIFO, cmd | B_LC);
-	while (!nand_flag_is_set(NAND_ISR_CMDDONE))
-		;
-}
-
-int board_nand_init(struct nand_chip *nand)
-{
-	bd = (struct nand_bd *)memalign(ARCH_DMA_MINALIGN,
-					sizeof(struct nand_bd));
-
-	/* Set buffer descriptor address in IDMAC */
-	NAND_REG_WRITE(IDMAC_BDADDR, bd);
-
-	nand->ecc.mode = NAND_ECC_SOFT;
-	nand->cmd_ctrl = axs101_nand_hwcontrol;
-	nand->read_byte = axs101_nand_read_byte;
-	nand->read_word = axs101_nand_read_word;
-	nand->write_buf = axs101_nand_write_buf;
-	nand->read_buf = axs101_nand_read_buf;
-
-	/* MBv3 has NAND IC with 16-bit data bus */
-	if (gd->board_type == AXS_MB_V3)
-		nand->options |= NAND_BUSWIDTH_16;
-
-	return 0;
-}