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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-05-16 11:10:33 +0200
committerWolfgang Denk <wd@denx.de>2008-06-03 20:31:34 +0200
commitd25ce7d24cc0f93881559f4009175ea305af65e8 (patch)
tree5f06370563f9a19fa0d0d266035d136e7688b487 /drivers/mtd/spi/spi_flash_internal.h
parent60445cb5c3eb77ed1a07f2d908eef09174483698 (diff)
downloadblackbird-obmc-uboot-d25ce7d24cc0f93881559f4009175ea305af65e8.tar.gz
blackbird-obmc-uboot-d25ce7d24cc0f93881559f4009175ea305af65e8.zip
SPI Flash subsystem
This adds a new SPI flash subsystem. Currently, only AT45 DataFlash in non-power-of-two mode is supported, but some preliminary support for other flash types is in place as well. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'drivers/mtd/spi/spi_flash_internal.h')
-rw-r--r--drivers/mtd/spi/spi_flash_internal.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h
new file mode 100644
index 0000000000..14380500aa
--- /dev/null
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -0,0 +1,45 @@
+/*
+ * SPI flash internal definitions
+ *
+ * Copyright (C) 2008 Atmel Corporation
+ */
+
+/* Common parameters */
+#define SPI_FLASH_PROG_TIMEOUT ((10 * CFG_HZ) / 1000)
+#define SPI_FLASH_PAGE_ERASE_TIMEOUT ((50 * CFG_HZ) / 1000)
+#define SPI_FLASH_SECTOR_ERASE_TIMEOUT (10 * CFG_HZ)
+
+/* Common commands */
+#define CMD_READ_ID 0x9f
+
+#define CMD_READ_ARRAY_SLOW 0x03
+#define CMD_READ_ARRAY_FAST 0x0b
+#define CMD_READ_ARRAY_LEGACY 0xe8
+
+/* Send a single-byte command to the device and read the response */
+int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len);
+
+/*
+ * Send a multi-byte command to the device and read the response. Used
+ * for flash array reads, etc.
+ */
+int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
+ size_t cmd_len, void *data, size_t data_len);
+
+/*
+ * Send a multi-byte command to the device followed by (optional)
+ * data. Used for programming the flash array, etc.
+ */
+int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
+ const void *data, size_t data_len);
+
+/*
+ * Same as spi_flash_cmd_read() except it also claims/releases the SPI
+ * bus. Used as common part of the ->read() operation.
+ */
+int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
+ size_t cmd_len, void *data, size_t data_len);
+
+/* Manufacturer-specific probe functions */
+struct spi_flash *spi_flash_probe_spansion(struct spi_slave *spi, u8 *idcode);
+struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode);
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