MLK-10467 mtd:spi Add ATMEL AT45DB021E support

This patch is to add atmel AT45DB021E spi flash support.

Since this flash is different from the spi flash that we previous use such
as m25p32 and spanion spi nor flashes, pieces of code are added.

1.
The default page size is 264 bytes, but the mtd/spi framework can not
handle such page. So we need to configure the page size from 264 to 256 bytes.

	Page Size				 command seq
“Power of 2” binary page size (256 bytes)|      3Dh 2Ah 80h A6h
DataFlash page size (264 bytes)          |      3Dh 2Ah 80h A7h
And when probe the flash, configure the flash to 256 bytes page size, if
the page size is already 256bytes, just return and do not configure it again.
The page size configuration times is only about 10000, so to avoid configuring
it each time.

2.
Add the flash params in sf_params.c.

3.
This flash support 2K block erase, add this flag.

4.
The status command is 0xD7, different from others. It's polling status
bit is Bit 7
-> 0 Device is busy with an internal operation.
-> 1 Device is ready.

This patch has been tested on mx7d 19x19 ddr3 arm2 board. And tested
on mx7d 12x12 lpddr3 board. All works fine.

Note:
Since this flash is only 256KB, we can not test spi boot on mx7d 19x19 arm2
board. If want to test this flash, open CONFIG_SYS_USE_SPINOR.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>

4 files changed, 95 insertions, 1 deletions

diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
index 6bcd522..9fd8c73 100644
--- a/drivers/mtd/spi/sf_internal.h
+++ b/drivers/mtd/spi/sf_internal.h
@@ -10,6 +10,9 @@
 #ifndef _SF_INTERNAL_H_
 #define _SF_INTERNAL_H_
 
+#define SPI_FLASH_PAGE_256		(1 << 0)
+#define SPI_FLASH_PAGE_264		(1 << 1)
+
 #define SPI_FLASH_3B_ADDR_LEN		3
 #define SPI_FLASH_CMD_LEN		(1 + SPI_FLASH_3B_ADDR_LEN)
 #define SPI_FLASH_16MB_BOUN		0x1000000
@@ -21,6 +24,7 @@
 #define SPI_FLASH_CFI_MFR_WINBOND	0xef
 
 /* Erase commands */
+#define CMD_ERASE_2K			0x50
 #define CMD_ERASE_4K			0x20
 #define CMD_ERASE_32K			0x52
 #define CMD_ERASE_CHIP			0xc7
@@ -30,7 +34,11 @@
 #define CMD_WRITE_STATUS		0x01
 #define CMD_PAGE_PROGRAM		0x02
 #define CMD_WRITE_DISABLE		0x04
+#ifdef CONFIG_SPI_FLASH_ATMEL
+#define CMD_READ_STATUS			0xd7
+#else
 #define CMD_READ_STATUS			0x05
+#endif
 #define CMD_QUAD_PAGE_PROGRAM		0x32
 #define CMD_READ_STATUS1		0x35
 #define CMD_WRITE_ENABLE		0x06
diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c
index ef91b92..d9dee2a 100644
--- a/drivers/mtd/spi/sf_ops.c
+++ b/drivers/mtd/spi/sf_ops.c
@@ -55,6 +55,75 @@ int spi_flash_cmd_write_status(struct spi_flash *flash, u8 ws)
 	return 0;
 }
 
+#if defined(CONFIG_SPI_FLASH_ATMEL)
+/*
+ * For the AT45DB021E, there are an extra eight bytes
+ * of memory in each page for a total of an extra 8KB
+ * (64-Kbits) of user-accessible memory.
+ * In order to be compatible with spi framework, we use 256bytes.
+ */
+
+int spi_flash_cmd_write_config(struct spi_flash *flash, u8 wc)
+{
+	u8 data[3];
+	u8 cmd;
+	int ret;
+
+	ret = spi_flash_cmd_read_status(flash, &data[0]);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * PAGE SIZE Page Size, bit 0.
+	 * 0 Device is configured for standard DataFlash page size (264 bytes).
+	 * 1 Device is configured for “power of 2” binary page size (256 bytes).
+	 */
+	if (wc == SPI_FLASH_PAGE_256) {
+		/* Already 256? */
+		if (data[0] & 1)
+			return 0;
+	} else if (wc == SPI_FLASH_PAGE_264) {
+		/* Already 264? */
+		if ((data[0] & 1) == 0)
+			return 0;
+	} else {
+		debug("Unsupport page configuration!\n");
+		return -1;
+	}
+
+	/*
+	 * 3D, 2A, 80, A6 command seq will configure flash page size 256.
+	 * 3D, 2A, 80, A7 command seq will configure flash page size 264.
+	 */
+	cmd = 0x3D;
+	if (wc == SPI_FLASH_PAGE_256)
+		data[2] = 0xA6;
+	else if (wc == SPI_FLASH_PAGE_264)
+		data[2] = 0xA7;
+	data[1] = 0x80;
+	data[0] = 0x2A;
+	ret = spi_flash_write_common(flash, &cmd, 1, data, 3);
+	if (ret) {
+		debug("SF: fail to write config register\n");
+		return ret;
+	}
+
+	/* Check again */
+	ret = spi_flash_cmd_read_status(flash, &data[0]);
+	if (ret < 0)
+		return ret;
+
+	/* Means failed to configure page size */
+	if (((wc == SPI_FLASH_PAGE_256) && ((data[0] & 1) == 0)) ||
+	    ((wc == SPI_FLASH_PAGE_264) && (data[0] & 1))) {
+		debug("Failed to configure page size!\n");
+		return -1;
+	}
+
+	return 0;
+}
+#endif
+
 #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
 int spi_flash_cmd_read_config(struct spi_flash *flash, u8 *rc)
 {
@@ -170,6 +239,11 @@ int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
 		check_status = poll_bit;
 	}
 
+#ifdef CONFIG_SPI_FLASH_ATMEL
+	poll_bit = STATUS_PEC;
+	check_status = 1 << 7;
+#endif
+
 #ifdef CONFIG_SF_DUAL_FLASH
 	if (spi->flags & SPI_XFER_U_PAGE)
 		flags |= SPI_XFER_U_PAGE;
diff --git a/drivers/mtd/spi/sf_params.c b/drivers/mtd/spi/sf_params.c
index eb372b7..8c113b4 100644
--- a/drivers/mtd/spi/sf_params.c
+++ b/drivers/mtd/spi/sf_params.c
@@ -15,6 +15,7 @@
 const struct spi_flash_params spi_flash_params_table[] = {
 #ifdef CONFIG_SPI_FLASH_ATMEL		/* ATMEL */
 	{"AT45DB011D",	   0x1f2200, 0x0,	64 * 1024,     4,	0,		    SECT_4K},
+	{"AT45DB021E",	   0x1f2300, 0x100,	32 * 1024,     8,	0,		    SECT_2K},
 	{"AT45DB021D",	   0x1f2300, 0x0,	64 * 1024,     8,	0,		    SECT_4K},
 	{"AT45DB041D",	   0x1f2400, 0x0,	64 * 1024,     8,	0,		    SECT_4K},
 	{"AT45DB081D",	   0x1f2500, 0x0,	64 * 1024,    16,	0,		    SECT_4K},
diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c
index 36ae5e0..3aad903 100644
--- a/drivers/mtd/spi/sf_probe.c
+++ b/drivers/mtd/spi/sf_probe.c
@@ -169,7 +169,10 @@ static struct spi_flash *spi_flash_validate_params(struct spi_slave *spi,
 #endif
 
 	/* Compute erase sector and command */
-	if (params->flags & SECT_4K) {
+	if (params->flags & SECT_2K) {
+		flash->erase_cmd = CMD_ERASE_2K;
+		flash->erase_size = 2048 << flash->shift;
+	} else if (params->flags & SECT_4K) {
 		flash->erase_cmd = CMD_ERASE_4K;
 		flash->erase_size = 4096 << flash->shift;
 	} else if (params->flags & SECT_32K) {
@@ -250,6 +253,14 @@ static struct spi_flash *spi_flash_validate_params(struct spi_slave *spi,
 		spi_flash_cmd_write_status(flash, 0);
 #endif
 
+#if defined(CONFIG_SPI_FLASH_ATMEL)
+	/*
+	 * Default configure the page size to 256bytes to
+	 * be compatible with the mtd/spi framework
+	 */
+	spi_flash_cmd_write_config(flash, SPI_FLASH_PAGE_256);
+#endif
+
 	return flash;
 }