Blackfin: BF537-stamp: cleanup spi flash driver

This punts the old spi flash driver for a new/generalized one until the
common one can be integrated.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 815 insertions, 0 deletions

diff --git a/board/bf537-stamp/spi_flash.c b/board/bf537-stamp/spi_flash.c
new file mode 100644
index 0000000..7c73ddd
--- /dev/null
+++ b/board/bf537-stamp/spi_flash.c
@@ -0,0 +1,815 @@
+/*
+ * SPI flash driver
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Copyright (c) 2005-2007 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+/* Configuration options:
+ * CONFIG_SPI_BAUD - value to load into SPI_BAUD (divisor of SCLK to get SPI CLK)
+ * CONFIG_SPI_FLASH_SLOW_READ - force usage of the slower read
+ *		WARNING: make sure your SCLK + SPI_BAUD is slow enough
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/mach-common/bits/spi.h>
+
+/* Forcibly phase out these */
+#ifdef CONFIG_SPI_FLASH_NUM_SECTORS
+# error do not set CONFIG_SPI_FLASH_NUM_SECTORS
+#endif
+#ifdef CONFIG_SPI_FLASH_SECTOR_SIZE
+# error do not set CONFIG_SPI_FLASH_SECTOR_SIZE
+#endif
+
+#if defined(CONFIG_SPI)
+
+struct flash_info {
+	char     *name;
+	uint16_t id;
+	unsigned sector_size;
+	unsigned num_sectors;
+};
+
+/* SPI Speeds: 50 MHz / 33 MHz */
+static struct flash_info flash_spansion_serial_flash[] = {
+	{ "S25FL016", 0x0215, 64 * 1024, 32 },
+	{ "S25FL032", 0x0216, 64 * 1024, 64 },
+	{ "S25FL064", 0x0217, 64 * 1024, 128 },
+	{ "S25FL0128", 0x0218, 256 * 1024, 64 },
+	{ NULL, 0, 0, 0 }
+};
+
+/* SPI Speeds: 50 MHz / 20 MHz */
+static struct flash_info flash_st_serial_flash[] = {
+	{ "m25p05", 0x2010, 32 * 1024, 2 },
+	{ "m25p10", 0x2011, 32 * 1024, 4 },
+	{ "m25p20", 0x2012, 64 * 1024, 4 },
+	{ "m25p40", 0x2013, 64 * 1024, 8 },
+	{ "m25p16", 0x2015, 64 * 1024, 32 },
+	{ "m25p32", 0x2016, 64 * 1024, 64 },
+	{ "m25p64", 0x2017, 64 * 1024, 128 },
+	{ "m25p128", 0x2018, 256 * 1024, 64 },
+	{ NULL, 0, 0, 0 }
+};
+
+/* SPI Speeds: 66 MHz / 33 MHz */
+static struct flash_info flash_atmel_dataflash[] = {
+	{ "AT45DB011x", 0x0c, 264, 512 },
+	{ "AT45DB021x", 0x14, 264, 1025 },
+	{ "AT45DB041x", 0x1c, 264, 2048 },
+	{ "AT45DB081x", 0x24, 264, 4096 },
+	{ "AT45DB161x", 0x2c, 528, 4096 },
+	{ "AT45DB321x", 0x34, 528, 8192 },
+	{ "AT45DB642x", 0x3c, 1056, 8192 },
+	{ NULL, 0, 0, 0 }
+};
+
+/* SPI Speed: 50 MHz / 25 MHz or 40 MHz / 20 MHz */
+static struct flash_info flash_winbond_serial_flash[] = {
+	{ "W25X10", 0x3011, 16 * 256, 32 },
+	{ "W25X20", 0x3012, 16 * 256, 64 },
+	{ "W25X40", 0x3013, 16 * 256, 128 },
+	{ "W25X80", 0x3014, 16 * 256, 256 },
+	{ "W25P80", 0x2014, 256 * 256, 16 },
+	{ "W25P16", 0x2015, 256 * 256, 32 },
+	{ NULL, 0, 0, 0 }
+};
+
+struct flash_ops {
+	uint8_t read, write, erase, status;
+};
+
+#ifdef CONFIG_SPI_FLASH_SLOW_READ
+# define OP_READ 0x03
+#else
+# define OP_READ 0x0B
+#endif
+static struct flash_ops flash_st_ops = {
+	.read = OP_READ,
+	.write = 0x02,
+	.erase = 0xD8,
+	.status = 0x05,
+};
+
+static struct flash_ops flash_atmel_ops = {
+	.read = OP_READ,
+	.write = 0x82,
+	.erase = 0x81,
+	.status = 0xD7,
+};
+
+static struct flash_ops flash_winbond_ops = {
+	.read = OP_READ,
+	.write = 0x02,
+	.erase = 0x20,
+	.status = 0x05,
+};
+
+struct manufacturer_info {
+	const char *name;
+	uint8_t id;
+	struct flash_info *flashes;
+	struct flash_ops *ops;
+};
+
+static struct {
+	struct manufacturer_info *manufacturer;
+	struct flash_info *flash;
+	struct flash_ops *ops;
+	uint8_t manufacturer_id, device_id1, device_id2;
+	unsigned int write_length;
+	unsigned long sector_size, num_sectors;
+} flash;
+
+enum {
+	JED_MANU_SPANSION = 0x01,
+	JED_MANU_ST       = 0x20,
+	JED_MANU_ATMEL    = 0x1F,
+	JED_MANU_WINBOND  = 0xEF,
+};
+
+static struct manufacturer_info flash_manufacturers[] = {
+	{
+		.name = "Spansion",
+		.id = JED_MANU_SPANSION,
+		.flashes = flash_spansion_serial_flash,
+		.ops = &flash_st_ops,
+	},
+	{
+		.name = "ST",
+		.id = JED_MANU_ST,
+		.flashes = flash_st_serial_flash,
+		.ops = &flash_st_ops,
+	},
+	{
+		.name = "Atmel",
+		.id = JED_MANU_ATMEL,
+		.flashes = flash_atmel_dataflash,
+		.ops = &flash_atmel_ops,
+	},
+	{
+		.name = "Winbond",
+		.id = JED_MANU_WINBOND,
+		.flashes = flash_winbond_serial_flash,
+		.ops = &flash_winbond_ops,
+	},
+};
+
+#define	TIMEOUT	5000	/* timeout of 5 seconds */
+
+/* BF54x support */
+#ifndef pSPI_CTL
+# define pSPI_CTL  pSPI0_CTL
+# define pSPI_BAUD pSPI0_BAUD
+# define pSPI_FLG  pSPI0_FLG
+# define pSPI_RDBR pSPI0_RDBR
+# define pSPI_STAT pSPI0_STAT
+# define pSPI_TDBR pSPI0_TDBR
+# define SPI0_SCK	0x0001
+# define SPI0_MOSI	0x0004
+# define SPI0_MISO	0x0002
+# define SPI0_SEL1	0x0010
+#endif
+
+/* Default to the SPI SSEL that we boot off of:
+ *	BF54x, BF537, (everything new?): SSEL1
+ *	BF533, BF561: SSEL2
+ */
+#ifndef CONFIG_SPI_FLASH_SSEL
+# if defined(__ADSPBF531__) || defined(__ADSPBF532__) || \
+     defined(__ADSPBF533__) || defined(__ADSPBF561__)
+#  define CONFIG_SPI_FLASH_SSEL 2
+# else
+#  define CONFIG_SPI_FLASH_SSEL 1
+# endif
+#endif
+#define SSEL_MASK (1 << CONFIG_SPI_FLASH_SSEL)
+
+static void SPI_INIT(void)
+{
+	/* [#3541] This delay appears to be necessary, but not sure
+	 * exactly why as the history behind it is non-existant.
+	 */
+	udelay(CONFIG_CCLK_HZ / 25000000);
+
+	/* enable SPI pins: SSEL, MOSI, MISO, SCK */
+#ifdef __ADSPBF54x__
+	*pPORTE_FER |= (SPI0_SCK | SPI0_MOSI | SPI0_MISO | SPI0_SEL1);
+#elif defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__)
+	*pPORTF_FER |= (PF10 | PF11 | PF12 | PF13);
+#elif defined(__ADSPBF52x__)
+	bfin_write_PORTG_MUX((bfin_read_PORTG_MUX() & ~PORT_x_MUX_0_MASK) | PORT_x_MUX_0_FUNC_3);
+	bfin_write_PORTG_FER(bfin_read_PORTG_FER() | PG1 | PG2 | PG3 | PG4);
+#endif
+
+	/* initate communication upon write of TDBR */
+	*pSPI_CTL = (SPE|MSTR|CPHA|CPOL|0x01);
+	*pSPI_BAUD = CONFIG_SPI_BAUD;
+}
+
+static void SPI_DEINIT(void)
+{
+	/* put SPI settings back to reset state */
+	*pSPI_CTL = 0x0400;
+	*pSPI_BAUD = 0;
+	SSYNC();
+}
+
+static void SPI_ON(void)
+{
+	/* toggle SSEL to reset the device so it'll take a new command */
+	*pSPI_FLG = 0xFF00 | SSEL_MASK;
+	SSYNC();
+
+	*pSPI_FLG = ((0xFF & ~SSEL_MASK) << 8) | SSEL_MASK;
+	SSYNC();
+}
+
+static void SPI_OFF(void)
+{
+	/* put SPI settings back to reset state */
+	*pSPI_FLG = 0xFF00;
+	SSYNC();
+}
+
+static uint8_t spi_write_read_byte(uint8_t transmit)
+{
+	*pSPI_TDBR = transmit;
+	SSYNC();
+
+	while ((*pSPI_STAT & TXS))
+		if (ctrlc())
+			break;
+	while (!(*pSPI_STAT & SPIF))
+		if (ctrlc())
+			break;
+	while (!(*pSPI_STAT & RXS))
+		if (ctrlc())
+			break;
+
+	/* Read dummy to empty the receive register */
+	return *pSPI_RDBR;
+}
+
+static uint8_t read_status_register(void)
+{
+	uint8_t status_register;
+
+	/* send instruction to read status register */
+	SPI_ON();
+	spi_write_read_byte(flash.ops->status);
+	/* send dummy to receive the status register */
+	status_register = spi_write_read_byte(0);
+	SPI_OFF();
+
+	return status_register;
+}
+
+static int wait_for_ready_status(void)
+{
+	ulong start = get_timer(0);
+
+	while (get_timer(0) - start < TIMEOUT) {
+		switch (flash.manufacturer_id) {
+		case JED_MANU_SPANSION:
+		case JED_MANU_ST:
+		case JED_MANU_WINBOND:
+			if (!(read_status_register() & 0x01))
+				return 0;
+			break;
+
+		case JED_MANU_ATMEL:
+			if (read_status_register() & 0x80)
+				return 0;
+			break;
+		}
+
+		if (ctrlc()) {
+			puts("\nAbort\n");
+			return -1;
+		}
+	}
+
+	puts("Timeout\n");
+	return -1;
+}
+
+/* Request and read the manufacturer and device id of parts which
+ * are compatible with the JEDEC standard (JEP106) and use that to
+ * setup other operating conditions.
+ */
+static int spi_detect_part(void)
+{
+	uint16_t dev_id;
+	size_t i;
+
+	static char called_init;
+	if (called_init)
+		return 0;
+
+	SPI_ON();
+
+	/* Send the request for the part identification */
+	spi_write_read_byte(0x9F);
+
+	/* Now read in the manufacturer id bytes */
+	do {
+		flash.manufacturer_id = spi_write_read_byte(0);
+		if (flash.manufacturer_id == 0x7F)
+			puts("Warning: unhandled manufacturer continuation byte!\n");
+	} while (flash.manufacturer_id == 0x7F);
+
+	/* Now read in the first device id byte */
+	flash.device_id1 = spi_write_read_byte(0);
+
+	/* Now read in the second device id byte */
+	flash.device_id2 = spi_write_read_byte(0);
+
+	SPI_OFF();
+
+	dev_id = (flash.device_id1 << 8) | flash.device_id2;
+
+	for (i = 0; i < ARRAY_SIZE(flash_manufacturers); ++i) {
+		if (flash.manufacturer_id == flash_manufacturers[i].id)
+			break;
+	}
+	if (i == ARRAY_SIZE(flash_manufacturers))
+		goto unknown;
+
+	flash.manufacturer = &flash_manufacturers[i];
+	flash.ops = flash_manufacturers[i].ops;
+
+	switch (flash.manufacturer_id) {
+	case JED_MANU_SPANSION:
+	case JED_MANU_ST:
+	case JED_MANU_WINBOND:
+		for (i = 0; flash.manufacturer->flashes[i].name; ++i) {
+			if (dev_id == flash.manufacturer->flashes[i].id)
+				break;
+		}
+		if (!flash.manufacturer->flashes[i].name)
+			goto unknown;
+
+		flash.flash = &flash.manufacturer->flashes[i];
+		flash.sector_size = flash.flash->sector_size;
+		flash.num_sectors = flash.flash->num_sectors;
+		flash.write_length = 256;
+		break;
+
+	case JED_MANU_ATMEL: {
+		uint8_t status = read_status_register();
+
+		for (i = 0; flash.manufacturer->flashes[i].name; ++i) {
+			if ((status & 0x3c) == flash.manufacturer->flashes[i].id)
+				break;
+		}
+		if (!flash.manufacturer->flashes[i].name)
+			goto unknown;
+
+		flash.flash = &flash.manufacturer->flashes[i];
+		flash.sector_size = flash.flash->sector_size;
+		flash.num_sectors = flash.flash->num_sectors;
+
+		/* see if flash is in "power of 2" mode */
+		if (status & 0x1)
+			flash.sector_size &= ~(1 << (ffs(flash.sector_size) - 1));
+
+		flash.write_length = flash.sector_size;
+		break;
+	}
+	}
+
+	called_init = 1;
+	return 0;
+
+ unknown:
+	printf("Unknown SPI device: 0x%02X 0x%02X 0x%02X\n",
+		flash.manufacturer_id, flash.device_id1, flash.device_id2);
+	return 1;
+}
+
+/*
+ * Function:    spi_init_f
+ * Description: Init SPI-Controller (ROM part)
+ * return:      ---
+ */
+void spi_init_f(void)
+{
+}
+
+/*
+ * Function:    spi_init_r
+ * Description: Init SPI-Controller (RAM part) -
+ *		 The malloc engine is ready and we can move our buffers to
+ *		 normal RAM
+ *  return:      ---
+ */
+void spi_init_r(void)
+{
+#if defined(CONFIG_POST) && (CONFIG_POST & CFG_POST_SPI)
+	/* Our testing strategy here is pretty basic:
+	 *  - fill src memory with an 8-bit pattern
+	 *  - write the src memory to the SPI flash
+	 *  - read the SPI flash into the dst memory
+	 *  - compare src and dst memory regions
+	 *  - repeat a few times
+	 * The variations we test for:
+	 *  - change the 8-bit pattern a bit
+	 *  - change the read/write block size so we know:
+	 *    - writes smaller/equal/larger than the buffer work
+	 *    - writes smaller/equal/larger than the sector work
+	 *  - change the SPI offsets so we know:
+	 *    - writing partial sectors works
+	 */
+	uint8_t *mem_src, *mem_dst;
+	size_t i, c, l, o;
+	size_t test_count, errors;
+	uint8_t pattern;
+
+	SPI_INIT();
+
+	if (spi_detect_part())
+		goto out;
+	eeprom_info();
+
+	ulong lengths[] = {
+		flash.write_length,
+		flash.write_length * 2,
+		flash.write_length / 2,
+		flash.sector_size,
+		flash.sector_size * 2,
+		flash.sector_size / 2
+	};
+	ulong offsets[] = {
+		0,
+		flash.write_length,
+		flash.write_length * 2,
+		flash.write_length / 2,
+		flash.write_length / 4,
+		flash.sector_size,
+		flash.sector_size * 2,
+		flash.sector_size / 2,
+		flash.sector_size / 4,
+	};
+
+	/* the exact addresses are arbitrary ... they just need to not overlap */
+	mem_src = (void *)(0);
+	mem_dst = (void *)(max(flash.write_length, flash.sector_size) * 2);
+
+	test_count = 0;
+	errors = 0;
+	pattern = 0x00;
+
+	for (i = 0; i < 16; ++i) {	/* 16 = 8 bits * 2 iterations */
+		for (l = 0; l < ARRAY_SIZE(lengths); ++l) {
+			for (o = 0; o < ARRAY_SIZE(offsets); ++o) {
+				ulong len = lengths[l];
+				ulong off = offsets[o];
+
+				printf("Testing pattern 0x%02X of length %5lu and offset %5lu: ", pattern, len, off);
+
+				/* setup the source memory region */
+				memset(mem_src, pattern, len);
+
+				test_count += 4;
+				for (c = 0; c < 4; ++c) {	/* 4 is just a random repeat count */
+					if (ctrlc()) {
+						puts("\nAbort\n");
+						goto out;
+					}
+
+					/* make sure background fill pattern != pattern */
+					memset(mem_dst, pattern ^ 0xFF, len);
+
+					/* write out the source memory and then read it back and compare */
+					eeprom_write(0, off, mem_src, len);
+					eeprom_read(0, off, mem_dst, len);
+
+					if (memcmp(mem_src, mem_dst, len)) {
+						for (c = 0; c < len; ++c)
+							if (mem_src[c] != mem_dst[c])
+								break;
+						printf(" FAIL @ offset %u, skipping repeats ", c);
+						++errors;
+						break;
+					}
+
+					/* XXX: should shrink write region here to test with
+					 * leading/trailing canaries so we know surrounding
+					 * bytes don't get screwed.
+					 */
+				}
+				puts("\n");
+			}
+		}
+
+		/* invert the pattern every other run and shift out bits slowly */
+		pattern ^= 0xFF;
+		if (i % 2)
+			pattern = (pattern | 0x01) << 1;
+	}
+
+	if (errors)
+		printf("SPI FAIL: Out of %i tests, there were %i errors ;(\n", test_count, errors);
+	else
+		printf("SPI PASS: %i tests worked!\n", test_count);
+
+ out:
+	SPI_DEINIT();
+
+#endif
+}
+
+static void transmit_address(uint32_t addr)
+{
+	/* Send the highest byte of the 24 bit address at first */
+	spi_write_read_byte(addr >> 16);
+	/* Send the middle byte of the 24 bit address  at second */
+	spi_write_read_byte(addr >> 8);
+	/* Send the lowest byte of the 24 bit address finally */
+	spi_write_read_byte(addr);
+}
+
+/*
+ * Read a value from flash for verify purpose
+ * Inputs:	unsigned long ulStart - holds the SPI start address
+ *			int pnData - pointer to store value read from flash
+ *			long lCount - number of elements to read
+ */
+static int read_flash(unsigned long address, long count, uchar *buffer)
+{
+	size_t i;
+
+	/* Send the read command to SPI device */
+	SPI_ON();
+	spi_write_read_byte(flash.ops->read);
+	transmit_address(address);
+
+#ifndef CONFIG_SPI_FLASH_SLOW_READ
+	/* Send dummy byte when doing SPI fast reads */
+	spi_write_read_byte(0);
+#endif
+
+	/* After the SPI device address has been placed on the MOSI pin the data can be */
+	/* received on the MISO pin. */
+	for (i = 1; i <= count; ++i) {
+		*buffer++ = spi_write_read_byte(0);
+		if (i % flash.sector_size == 0)
+			puts(".");
+	}
+
+	SPI_OFF();
+
+	return 0;
+}
+
+static int enable_writing(void)
+{
+	ulong start;
+
+	if (flash.manufacturer_id == JED_MANU_ATMEL)
+		return 0;
+
+	/* A write enable instruction must previously have been executed */
+	SPI_ON();
+	spi_write_read_byte(0x06);
+	SPI_OFF();
+
+	/* The status register will be polled to check the write enable latch "WREN" */
+	start = get_timer(0);
+	while (get_timer(0) - start < TIMEOUT) {
+		if (read_status_register() & 0x02)
+			return 0;
+
+		if (ctrlc()) {
+			puts("\nAbort\n");
+			return -1;
+		}
+	}
+
+	puts("Timeout\n");
+	return -1;
+}
+
+static long address_to_sector(unsigned long address)
+{
+	if (address > (flash.num_sectors * flash.sector_size) - 1)
+		return -1;
+	return address / flash.sector_size;
+}
+
+static int erase_sector(int address)
+{
+	/* sector gets checked in higher function, so assume it's valid
+	 * here and figure out the offset of the sector in flash
+	 */
+	if (enable_writing())
+		return -1;
+
+	/*
+	 * Send the erase block command to the flash followed by the 24 address
+	 * to point to the start of a sector
+	 */
+	SPI_ON();
+	spi_write_read_byte(flash.ops->erase);
+	transmit_address(address);
+	SPI_OFF();
+
+	return wait_for_ready_status();
+}
+
+/* Write [count] bytes out of [buffer] into the given SPI [address] */
+static long write_flash(unsigned long address, long count, uchar *buffer)
+{
+	long i, write_buffer_size;
+
+	if (enable_writing())
+		return -1;
+
+	/* Send write command followed by the 24 bit address */
+	SPI_ON();
+	spi_write_read_byte(flash.ops->write);
+	transmit_address(address);
+
+	/* Shoot out a single write buffer */
+	write_buffer_size = min(count, flash.write_length);
+	for (i = 0; i < write_buffer_size; ++i)
+		spi_write_read_byte(buffer[i]);
+
+	SPI_OFF();
+
+	/* Wait for the flash to do its thing */
+	if (wait_for_ready_status()) {
+		puts("SPI Program Time out! ");
+		return -1;
+	}
+
+	return i;
+}
+
+/* Write [count] bytes out of [buffer] into the given SPI [address] */
+static int write_sector(unsigned long address, long count, uchar *buffer)
+{
+	long write_cnt;
+
+	while (count != 0) {
+		write_cnt = write_flash(address, count, buffer);
+		if (write_cnt == -1)
+			return -1;
+
+		/* Now that we've sent some bytes out to the flash, update
+		 * our counters a bit
+		 */
+		count -= write_cnt;
+		address += write_cnt;
+		buffer += write_cnt;
+	}
+
+	/* return the appropriate error code */
+	return 0;
+}
+
+/*
+ * Function:    spi_write
+ */
+ssize_t spi_write(uchar *addr, int alen, uchar *buffer, int len)
+{
+	unsigned long offset;
+	int start_sector, end_sector;
+	int start_byte, end_byte;
+	uchar *temp = NULL;
+	int num, ret = 0;
+
+	SPI_INIT();
+
+	if (spi_detect_part())
+		goto out;
+
+	offset = addr[0] << 16 | addr[1] << 8 | addr[2];
+
+	/* Get the start block number */
+	start_sector = address_to_sector(offset);
+	if (start_sector == -1) {
+		puts("Invalid sector! ");
+		goto out;
+	}
+	end_sector = address_to_sector(offset + len - 1);
+	if (end_sector == -1) {
+		puts("Invalid sector! ");
+		goto out;
+	}
+
+	/* Since flashes operate in sector units but the eeprom command
+	 * operates as a continuous stream of bytes, we need to emulate
+	 * the eeprom behavior.  So here we read in the sector, overlay
+	 * any bytes we're actually modifying, erase the sector, and
+	 * then write back out the new sector.
+	 */
+	temp = malloc(flash.sector_size);
+	if (!temp) {
+		puts("Malloc for sector failed! ");
+		goto out;
+	}
+
+	for (num = start_sector; num <= end_sector; num++) {
+		unsigned long address = num * flash.sector_size;
+
+		/* XXX: should add an optimization when spanning sectors:
+		 * No point in reading in a sector if we're going to be
+		 * clobbering the whole thing.  Need to also add a test
+		 * case to make sure the optimization is correct.
+		 */
+		if (read_flash(address, flash.sector_size, temp)) {
+			puts("Read sector failed! ");
+			len = 0;
+			break;
+		}
+
+		start_byte = max(address, offset);
+		end_byte = address + flash.sector_size - 1;
+		if (end_byte > (offset + len))
+			end_byte = (offset + len - 1);
+
+		memcpy(temp + start_byte - address,
+			buffer + start_byte - offset,
+			end_byte - start_byte + 1);
+
+		if (erase_sector(address)) {
+			puts("Erase sector failed! ");
+			goto out;
+		}
+
+		if (write_sector(address, flash.sector_size, temp)) {
+			puts("Write sector failed! ");
+			goto out;
+		}
+
+		puts(".");
+	}
+
+	ret = len;
+
+ out:
+	free(temp);
+
+	SPI_DEINIT();
+
+	return ret;
+}
+
+/*
+ * Function: spi_read
+ */
+ssize_t spi_read(uchar *addr, int alen, uchar *buffer, int len)
+{
+	unsigned long offset;
+
+	SPI_INIT();
+
+	if (spi_detect_part())
+		len = 0;
+	else {
+		offset = addr[0] << 16 | addr[1] << 8 | addr[2];
+		read_flash(offset, len, buffer);
+	}
+
+	SPI_DEINIT();
+
+	return len;
+}
+
+/*
+ *	Spit out some useful information about the SPI eeprom
+ */
+int eeprom_info(void)
+{
+	int ret = 0;
+
+	SPI_INIT();
+
+	if (spi_detect_part())
+		ret = 1;
+	else
+		printf("SPI Device: %s 0x%02X (%s) 0x%02X 0x%02X\n"
+			"Parameters: num sectors = %i, sector size = %i, write size = %i\n"
+			"Flash Size: %i mbit (%i mbyte)\n"
+			"Status: 0x%02X\n",
+			flash.flash->name, flash.manufacturer_id, flash.manufacturer->name,
+			flash.device_id1, flash.device_id2, flash.num_sectors,
+			flash.sector_size, flash.write_length,
+			(flash.num_sectors * flash.sector_size) >> 17,
+			(flash.num_sectors * flash.sector_size) >> 20,
+			read_status_register());
+
+	SPI_DEINIT();
+
+	return ret;
+}
+
+#endif