drivers/mtd/altera_qspi.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
  */

 #include <common.h>
 #include <console.h>
 #include <dm.h>
 #include <errno.h>
 #include <fdt_support.h>
 #include <flash.h>
 #include <log.h>
 #include <mtd.h>
 #include <asm/io.h>
 #include <linux/bitops.h>

 DECLARE_GLOBAL_DATA_PTR;

 /* The STATUS register */
 #define QUADSPI_SR_BP0				BIT(2)
 #define QUADSPI_SR_BP1				BIT(3)
 #define QUADSPI_SR_BP2				BIT(4)
 #define QUADSPI_SR_BP2_0			GENMASK(4, 2)
 #define QUADSPI_SR_BP3				BIT(6)
 #define QUADSPI_SR_TB				BIT(5)

 /*
  * The QUADSPI_MEM_OP register is used to do memory protect and erase operations
  */
 #define QUADSPI_MEM_OP_BULK_ERASE		0x00000001
 #define QUADSPI_MEM_OP_SECTOR_ERASE		0x00000002
 #define QUADSPI_MEM_OP_SECTOR_PROTECT		0x00000003

 /*
  * The QUADSPI_ISR register is used to determine whether an invalid write or
  * erase operation trigerred an interrupt
  */
 #define QUADSPI_ISR_ILLEGAL_ERASE		BIT(0)
 #define QUADSPI_ISR_ILLEGAL_WRITE		BIT(1)

 struct altera_qspi_regs {
 	u32	rd_status;
 	u32	rd_sid;
 	u32	rd_rdid;
 	u32	mem_op;
 	u32	isr;
 	u32	imr;
 	u32	chip_select;
 };

 struct altera_qspi_platdata {
 	struct altera_qspi_regs *regs;
 	void *base;
 	unsigned long size;
 };

 static uint flash_verbose;
 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];	/* FLASH chips info */

 static void altera_qspi_get_locked_range(struct mtd_info *mtd, loff_t *ofs,
 					 uint64_t *len);

 void flash_print_info(flash_info_t *info)
 {
 	struct mtd_info *mtd = info->mtd;
 	loff_t ofs;
 	u64 len;

 	printf("Altera QSPI flash  Size: %ld MB in %d Sectors\n",
 	       info->size >> 20, info->sector_count);
 	altera_qspi_get_locked_range(mtd, &ofs, &len);
 	printf("  %08lX +%lX", info->start[0], info->size);
 	if (len) {
 		printf(", protected %08llX +%llX",
 		       info->start[0] + ofs, len);
 	}
 	putc('\n');
 }

 void flash_set_verbose(uint v)
 {
 	flash_verbose = v;
 }

 int flash_erase(flash_info_t *info, int s_first, int s_last)
 {
 	struct mtd_info *mtd = info->mtd;
 	struct erase_info instr;
 	int ret;

 	memset(&instr, 0, sizeof(instr));
 	instr.mtd = mtd;
 	instr.addr = mtd->erasesize * s_first;
 	instr.len = mtd->erasesize * (s_last + 1 - s_first);
 	flash_set_verbose(1);
 	ret = mtd_erase(mtd, &instr);
 	flash_set_verbose(0);
 	if (ret)
 		return ERR_PROTECTED;

 	puts(" done\n");
 	return 0;
 }

 int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 {
 	struct mtd_info *mtd = info->mtd;
 	struct udevice *dev = mtd->dev;
 	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
 	ulong base = (ulong)pdata->base;
 	loff_t to = addr - base;
 	size_t retlen;
 	int ret;

 	ret = mtd_write(mtd, to, cnt, &retlen, src);
 	if (ret)
 		return ERR_PROTECTED;

 	return 0;
 }

 unsigned long flash_init(void)
 {
 	struct udevice *dev;

 	/* probe every MTD device */
 	for (uclass_first_device(UCLASS_MTD, &dev);
 	     dev;
 	     uclass_next_device(&dev)) {
 	}

 	return flash_info[0].size;
 }

 static int altera_qspi_erase(struct mtd_info *mtd, struct erase_info *instr)
 {
 	struct udevice *dev = mtd->dev;
 	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
 	struct altera_qspi_regs *regs = pdata->regs;
 	size_t addr = instr->addr;
 	size_t len = instr->len;
 	size_t end = addr + len;
 	u32 sect;
 	u32 stat;
 	u32 *flash, *last;

 	instr->state = MTD_ERASING;
 	addr &= ~(mtd->erasesize - 1); /* get lower aligned address */
 	while (addr < end) {
 		if (ctrlc()) {
 			if (flash_verbose)
 				putc('\n');
 			instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
 			instr->state = MTD_ERASE_FAILED;
 			mtd_erase_callback(instr);
 			return -EIO;
 		}
 		flash = pdata->base + addr;
 		last = pdata->base + addr + mtd->erasesize;
 		/* skip erase if sector is blank */
 		while (flash < last) {
 			if (readl(flash) != 0xffffffff)
 				break;
 			flash++;
 		}
 		if (flash < last) {
 			sect = addr / mtd->erasesize;
 			sect <<= 8;
 			sect |= QUADSPI_MEM_OP_SECTOR_ERASE;
 			debug("erase %08x\n", sect);
 			writel(sect, &regs->mem_op);
 			stat = readl(&regs->isr);
 			if (stat & QUADSPI_ISR_ILLEGAL_ERASE) {
 				/* erase failed, sector might be protected */
 				debug("erase %08x fail %x\n", sect, stat);
 				writel(stat, &regs->isr); /* clear isr */
 				instr->fail_addr = addr;
 				instr->state = MTD_ERASE_FAILED;
 				mtd_erase_callback(instr);
 				return -EIO;
 			}
 			if (flash_verbose)
 				putc('.');
 		} else {
 			if (flash_verbose)
 				putc(',');
 		}
 		addr += mtd->erasesize;
 	}
 	instr->state = MTD_ERASE_DONE;
 	mtd_erase_callback(instr);

 	return 0;
 }

 static int altera_qspi_read(struct mtd_info *mtd, loff_t from, size_t len,
 			    size_t *retlen, u_char *buf)
 {
 	struct udevice *dev = mtd->dev;
 	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);

 	memcpy_fromio(buf, pdata->base + from, len);
 	*retlen = len;

 	return 0;
 }

 static int altera_qspi_write(struct mtd_info *mtd, loff_t to, size_t len,
 			     size_t *retlen, const u_char *buf)
 {
 	struct udevice *dev = mtd->dev;
 	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
 	struct altera_qspi_regs *regs = pdata->regs;
 	u32 stat;

 	memcpy_toio(pdata->base + to, buf, len);
 	/* check whether write triggered a illegal write interrupt */
 	stat = readl(&regs->isr);
 	if (stat & QUADSPI_ISR_ILLEGAL_WRITE) {
 		/* write failed, sector might be protected */
 		debug("write fail %x\n", stat);
 		writel(stat, &regs->isr); /* clear isr */
 		return -EIO;
 	}
 	*retlen = len;

 	return 0;
 }

 static void altera_qspi_sync(struct mtd_info *mtd)
 {
 }

 static void altera_qspi_get_locked_range(struct mtd_info *mtd, loff_t *ofs,
 					 uint64_t *len)
 {
 	struct udevice *dev = mtd->dev;
 	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
 	struct altera_qspi_regs *regs = pdata->regs;
 	int shift0 = ffs(QUADSPI_SR_BP2_0) - 1;
 	int shift3 = ffs(QUADSPI_SR_BP3) - 1 - 3;
 	u32 stat = readl(&regs->rd_status);
 	unsigned pow = ((stat & QUADSPI_SR_BP2_0) >> shift0) |
 		((stat & QUADSPI_SR_BP3) >> shift3);

 	*ofs = 0;
 	*len = 0;
 	if (pow) {
 		*len = mtd->erasesize << (pow - 1);
 		if (*len > mtd->size)
 			*len = mtd->size;
 		if (!(stat & QUADSPI_SR_TB))
 			*ofs = mtd->size - *len;
 	}
 }

 static int altera_qspi_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 {
 	struct udevice *dev = mtd->dev;
 	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
 	struct altera_qspi_regs *regs = pdata->regs;
 	u32 sector_start, sector_end;
 	u32 num_sectors;
 	u32 mem_op;
 	u32 sr_bp;
 	u32 sr_tb;

 	num_sectors = mtd->size / mtd->erasesize;
 	sector_start = ofs / mtd->erasesize;
 	sector_end = (ofs + len) / mtd->erasesize;

 	if (sector_start >= num_sectors / 2) {
 		sr_bp = fls(num_sectors - 1 - sector_start) + 1;
 		sr_tb = 0;
 	} else if (sector_end < num_sectors / 2) {
 		sr_bp = fls(sector_end) + 1;
 		sr_tb = 1;
 	} else {
 		sr_bp = 15;
 		sr_tb = 0;
 	}

 	mem_op = (sr_tb << 12) | (sr_bp << 8);
 	mem_op |= QUADSPI_MEM_OP_SECTOR_PROTECT;
 	debug("lock %08x\n", mem_op);
 	writel(mem_op, &regs->mem_op);

 	return 0;
 }

 static int altera_qspi_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 {
 	struct udevice *dev = mtd->dev;
 	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
 	struct altera_qspi_regs *regs = pdata->regs;
 	u32 mem_op;

 	mem_op = QUADSPI_MEM_OP_SECTOR_PROTECT;
 	debug("unlock %08x\n", mem_op);
 	writel(mem_op, &regs->mem_op);

 	return 0;
 }

 static int altera_qspi_probe(struct udevice *dev)
 {
 	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
 	struct altera_qspi_regs *regs = pdata->regs;
 	unsigned long base = (unsigned long)pdata->base;
 	struct mtd_info *mtd;
 	flash_info_t *flash = &flash_info[0];
 	u32 rdid;
 	int i;

 	rdid = readl(&regs->rd_rdid);
 	debug("rdid %x\n", rdid);

 	mtd = dev_get_uclass_priv(dev);
 	mtd->dev = dev;
 	mtd->name		= "nor0";
 	mtd->type		= MTD_NORFLASH;
 	mtd->flags		= MTD_CAP_NORFLASH;
 	mtd->size		= 1 << ((rdid & 0xff) - 6);
 	mtd->writesize		= 1;
 	mtd->writebufsize	= mtd->writesize;
 	mtd->_erase		= altera_qspi_erase;
 	mtd->_read		= altera_qspi_read;
 	mtd->_write		= altera_qspi_write;
 	mtd->_sync		= altera_qspi_sync;
 	mtd->_lock		= altera_qspi_lock;
 	mtd->_unlock		= altera_qspi_unlock;
 	mtd->numeraseregions = 0;
 	mtd->erasesize = 0x10000;
 	if (add_mtd_device(mtd))
 		return -ENOMEM;

 	flash->mtd = mtd;
 	flash->size = mtd->size;
 	flash->sector_count = mtd->size / mtd->erasesize;
 	flash->flash_id = rdid;
 	flash->start[0] = base;
 	for (i = 1; i < flash->sector_count; i++)
 		flash->start[i] = flash->start[i - 1] + mtd->erasesize;
 	gd->bd->bi_flashstart = base;

 	return 0;
 }

 static int altera_qspi_ofdata_to_platdata(struct udevice *dev)
 {
 	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
 	void *blob = (void *)gd->fdt_blob;
 	int node = dev_of_offset(dev);
 	const char *list, *end;
 	const fdt32_t *cell;
 	void *base;
 	unsigned long addr, size;
 	int parent, addrc, sizec;
 	int len, idx;

 	/*
 	 * decode regs. there are multiple reg tuples, and they need to
 	 * match with reg-names.
 	 */
 	parent = fdt_parent_offset(blob, node);
 	fdt_support_default_count_cells(blob, parent, &addrc, &sizec);
 	list = fdt_getprop(blob, node, "reg-names", &len);
 	if (!list)
 		return -ENOENT;
 	end = list + len;
 	cell = fdt_getprop(blob, node, "reg", &len);
 	if (!cell)
 		return -ENOENT;
 	idx = 0;
 	while (list < end) {
 		addr = fdt_translate_address((void *)blob,
 					     node, cell + idx);
 		size = fdt_addr_to_cpu(cell[idx + addrc]);
 		base = map_physmem(addr, size, MAP_NOCACHE);
 		len = strlen(list);
 		if (strcmp(list, "avl_csr") == 0) {
 			pdata->regs = base;
 		} else if (strcmp(list, "avl_mem") == 0) {
 			pdata->base = base;
 			pdata->size = size;
 		}
 		idx += addrc + sizec;
 		list += (len + 1);
 	}

 	return 0;
 }

 static const struct udevice_id altera_qspi_ids[] = {
 	{ .compatible = "altr,quadspi-1.0" },
 	{}
 };

 U_BOOT_DRIVER(altera_qspi) = {
 	.name	= "altera_qspi",
 	.id	= UCLASS_MTD,
 	.of_match = altera_qspi_ids,
 	.ofdata_to_platdata = altera_qspi_ofdata_to_platdata,
 	.platdata_auto	= sizeof(struct altera_qspi_platdata),
 	.probe	= altera_qspi_probe,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
	*/

	#include <common.h>
	#include <console.h>
	#include <dm.h>
	#include <errno.h>
	#include <fdt_support.h>
	#include <flash.h>
	#include <log.h>
	#include <mtd.h>
	#include <asm/io.h>
	#include <linux/bitops.h>

	DECLARE_GLOBAL_DATA_PTR;

	/* The STATUS register */
	#define QUADSPI_SR_BP0 BIT(2)
	#define QUADSPI_SR_BP1 BIT(3)
	#define QUADSPI_SR_BP2 BIT(4)
	#define QUADSPI_SR_BP2_0 GENMASK(4, 2)
	#define QUADSPI_SR_BP3 BIT(6)
	#define QUADSPI_SR_TB BIT(5)

	/*
	* The QUADSPI_MEM_OP register is used to do memory protect and erase operations
	*/
	#define QUADSPI_MEM_OP_BULK_ERASE 0x00000001
	#define QUADSPI_MEM_OP_SECTOR_ERASE 0x00000002
	#define QUADSPI_MEM_OP_SECTOR_PROTECT 0x00000003

	/*
	* The QUADSPI_ISR register is used to determine whether an invalid write or
	* erase operation trigerred an interrupt
	*/
	#define QUADSPI_ISR_ILLEGAL_ERASE BIT(0)
	#define QUADSPI_ISR_ILLEGAL_WRITE BIT(1)

	struct altera_qspi_regs {
	u32 rd_status;
	u32 rd_sid;
	u32 rd_rdid;
	u32 mem_op;
	u32 isr;
	u32 imr;
	u32 chip_select;
	};

	struct altera_qspi_platdata {
	struct altera_qspi_regs *regs;
	void *base;
	unsigned long size;
	};

	static uint flash_verbose;
	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* FLASH chips info */

	static void altera_qspi_get_locked_range(struct mtd_info mtd, loff_t ofs,
	uint64_t *len);

	void flash_print_info(flash_info_t *info)
	{
	struct mtd_info *mtd = info->mtd;
	loff_t ofs;
	u64 len;

	printf("Altera QSPI flash Size: %ld MB in %d Sectors\n",
	info->size >> 20, info->sector_count);
	altera_qspi_get_locked_range(mtd, &ofs, &len);
	printf(" %08lX +%lX", info->start[0], info->size);
	if (len) {
	printf(", protected %08llX +%llX",
	info->start[0] + ofs, len);
	}
	putc('\n');
	}

	void flash_set_verbose(uint v)
	{
	flash_verbose = v;
	}

	int flash_erase(flash_info_t *info, int s_first, int s_last)
	{
	struct mtd_info *mtd = info->mtd;
	struct erase_info instr;
	int ret;

	memset(&instr, 0, sizeof(instr));
	instr.mtd = mtd;
	instr.addr = mtd->erasesize * s_first;
	instr.len = mtd->erasesize * (s_last + 1 - s_first);
	flash_set_verbose(1);
	ret = mtd_erase(mtd, &instr);
	flash_set_verbose(0);
	if (ret)
	return ERR_PROTECTED;

	puts(" done\n");
	return 0;
	}

	int write_buff(flash_info_t info, uchar src, ulong addr, ulong cnt)
	{
	struct mtd_info *mtd = info->mtd;
	struct udevice *dev = mtd->dev;
	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
	ulong base = (ulong)pdata->base;
	loff_t to = addr - base;
	size_t retlen;
	int ret;

	ret = mtd_write(mtd, to, cnt, &retlen, src);
	if (ret)
	return ERR_PROTECTED;

	return 0;
	}

	unsigned long flash_init(void)
	{
	struct udevice *dev;

	/* probe every MTD device */
	for (uclass_first_device(UCLASS_MTD, &dev);
	dev;
	uclass_next_device(&dev)) {
	}

	return flash_info[0].size;
	}

	static int altera_qspi_erase(struct mtd_info mtd, struct erase_info instr)
	{
	struct udevice *dev = mtd->dev;
	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
	struct altera_qspi_regs *regs = pdata->regs;
	size_t addr = instr->addr;
	size_t len = instr->len;
	size_t end = addr + len;
	u32 sect;
	u32 stat;
	u32 flash, last;

	instr->state = MTD_ERASING;
	addr &= ~(mtd->erasesize - 1); /* get lower aligned address */
	while (addr < end) {
	if (ctrlc()) {
	if (flash_verbose)
	putc('\n');
	instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
	instr->state = MTD_ERASE_FAILED;
	mtd_erase_callback(instr);
	return -EIO;
	}
	flash = pdata->base + addr;
	last = pdata->base + addr + mtd->erasesize;
	/* skip erase if sector is blank */
	while (flash < last) {
	if (readl(flash) != 0xffffffff)
	break;
	flash++;
	}
	if (flash < last) {
	sect = addr / mtd->erasesize;
	sect <<= 8;
	sect \|= QUADSPI_MEM_OP_SECTOR_ERASE;
	debug("erase %08x\n", sect);
	writel(sect, &regs->mem_op);
	stat = readl(&regs->isr);
	if (stat & QUADSPI_ISR_ILLEGAL_ERASE) {
	/* erase failed, sector might be protected */
	debug("erase %08x fail %x\n", sect, stat);
	writel(stat, &regs->isr); /* clear isr */
	instr->fail_addr = addr;
	instr->state = MTD_ERASE_FAILED;
	mtd_erase_callback(instr);
	return -EIO;
	}
	if (flash_verbose)
	putc('.');
	} else {
	if (flash_verbose)
	putc(',');
	}
	addr += mtd->erasesize;
	}
	instr->state = MTD_ERASE_DONE;
	mtd_erase_callback(instr);

	return 0;
	}

	static int altera_qspi_read(struct mtd_info *mtd, loff_t from, size_t len,
	size_t retlen, u_char buf)
	{
	struct udevice *dev = mtd->dev;
	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);

	memcpy_fromio(buf, pdata->base + from, len);
	*retlen = len;

	return 0;
	}

	static int altera_qspi_write(struct mtd_info *mtd, loff_t to, size_t len,
	size_t retlen, const u_char buf)
	{
	struct udevice *dev = mtd->dev;
	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
	struct altera_qspi_regs *regs = pdata->regs;
	u32 stat;

	memcpy_toio(pdata->base + to, buf, len);
	/* check whether write triggered a illegal write interrupt */
	stat = readl(&regs->isr);
	if (stat & QUADSPI_ISR_ILLEGAL_WRITE) {
	/* write failed, sector might be protected */
	debug("write fail %x\n", stat);
	writel(stat, &regs->isr); /* clear isr */
	return -EIO;
	}
	*retlen = len;

	return 0;
	}

	static void altera_qspi_sync(struct mtd_info *mtd)
	{
	}

	static void altera_qspi_get_locked_range(struct mtd_info mtd, loff_t ofs,
	uint64_t *len)
	{
	struct udevice *dev = mtd->dev;
	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
	struct altera_qspi_regs *regs = pdata->regs;
	int shift0 = ffs(QUADSPI_SR_BP2_0) - 1;
	int shift3 = ffs(QUADSPI_SR_BP3) - 1 - 3;
	u32 stat = readl(&regs->rd_status);
	unsigned pow = ((stat & QUADSPI_SR_BP2_0) >> shift0) \|
	((stat & QUADSPI_SR_BP3) >> shift3);

	*ofs = 0;
	*len = 0;
	if (pow) {
	*len = mtd->erasesize << (pow - 1);
	if (*len > mtd->size)
	*len = mtd->size;
	if (!(stat & QUADSPI_SR_TB))
	ofs = mtd->size - len;
	}
	}

	static int altera_qspi_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
	{
	struct udevice *dev = mtd->dev;
	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
	struct altera_qspi_regs *regs = pdata->regs;
	u32 sector_start, sector_end;
	u32 num_sectors;
	u32 mem_op;
	u32 sr_bp;
	u32 sr_tb;

	num_sectors = mtd->size / mtd->erasesize;
	sector_start = ofs / mtd->erasesize;
	sector_end = (ofs + len) / mtd->erasesize;

	if (sector_start >= num_sectors / 2) {
	sr_bp = fls(num_sectors - 1 - sector_start) + 1;
	sr_tb = 0;
	} else if (sector_end < num_sectors / 2) {
	sr_bp = fls(sector_end) + 1;
	sr_tb = 1;
	} else {
	sr_bp = 15;
	sr_tb = 0;
	}

	mem_op = (sr_tb << 12) \| (sr_bp << 8);
	mem_op \|= QUADSPI_MEM_OP_SECTOR_PROTECT;
	debug("lock %08x\n", mem_op);
	writel(mem_op, &regs->mem_op);

	return 0;
	}

	static int altera_qspi_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
	{
	struct udevice *dev = mtd->dev;
	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
	struct altera_qspi_regs *regs = pdata->regs;
	u32 mem_op;

	mem_op = QUADSPI_MEM_OP_SECTOR_PROTECT;
	debug("unlock %08x\n", mem_op);
	writel(mem_op, &regs->mem_op);

	return 0;
	}

	static int altera_qspi_probe(struct udevice *dev)
	{
	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
	struct altera_qspi_regs *regs = pdata->regs;
	unsigned long base = (unsigned long)pdata->base;
	struct mtd_info *mtd;
	flash_info_t *flash = &flash_info[0];
	u32 rdid;
	int i;

	rdid = readl(&regs->rd_rdid);
	debug("rdid %x\n", rdid);

	mtd = dev_get_uclass_priv(dev);
	mtd->dev = dev;
	mtd->name = "nor0";
	mtd->type = MTD_NORFLASH;
	mtd->flags = MTD_CAP_NORFLASH;
	mtd->size = 1 << ((rdid & 0xff) - 6);
	mtd->writesize = 1;
	mtd->writebufsize = mtd->writesize;
	mtd->_erase = altera_qspi_erase;
	mtd->_read = altera_qspi_read;
	mtd->_write = altera_qspi_write;
	mtd->_sync = altera_qspi_sync;
	mtd->_lock = altera_qspi_lock;
	mtd->_unlock = altera_qspi_unlock;
	mtd->numeraseregions = 0;
	mtd->erasesize = 0x10000;
	if (add_mtd_device(mtd))
	return -ENOMEM;

	flash->mtd = mtd;
	flash->size = mtd->size;
	flash->sector_count = mtd->size / mtd->erasesize;
	flash->flash_id = rdid;
	flash->start[0] = base;
	for (i = 1; i < flash->sector_count; i++)
	flash->start[i] = flash->start[i - 1] + mtd->erasesize;
	gd->bd->bi_flashstart = base;

	return 0;
	}

	static int altera_qspi_ofdata_to_platdata(struct udevice *dev)
	{
	struct altera_qspi_platdata *pdata = dev_get_platdata(dev);
	void blob = (void )gd->fdt_blob;
	int node = dev_of_offset(dev);
	const char list, end;
	const fdt32_t *cell;
	void *base;
	unsigned long addr, size;
	int parent, addrc, sizec;
	int len, idx;

	/*
	* decode regs. there are multiple reg tuples, and they need to
	* match with reg-names.
	*/
	parent = fdt_parent_offset(blob, node);
	fdt_support_default_count_cells(blob, parent, &addrc, &sizec);
	list = fdt_getprop(blob, node, "reg-names", &len);
	if (!list)
	return -ENOENT;
	end = list + len;
	cell = fdt_getprop(blob, node, "reg", &len);
	if (!cell)
	return -ENOENT;
	idx = 0;
	while (list < end) {
	addr = fdt_translate_address((void *)blob,
	node, cell + idx);
	size = fdt_addr_to_cpu(cell[idx + addrc]);
	base = map_physmem(addr, size, MAP_NOCACHE);
	len = strlen(list);
	if (strcmp(list, "avl_csr") == 0) {
	pdata->regs = base;
	} else if (strcmp(list, "avl_mem") == 0) {
	pdata->base = base;
	pdata->size = size;
	}
	idx += addrc + sizec;
	list += (len + 1);
	}

	return 0;
	}

	static const struct udevice_id altera_qspi_ids[] = {
	{ .compatible = "altr,quadspi-1.0" },
	{}
	};

	U_BOOT_DRIVER(altera_qspi) = {
	.name = "altera_qspi",
	.id = UCLASS_MTD,
	.of_match = altera_qspi_ids,
	.ofdata_to_platdata = altera_qspi_ofdata_to_platdata,
	.platdata_auto = sizeof(struct altera_qspi_platdata),
	.probe = altera_qspi_probe,
	};