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authorSimon Glass <sjg@chromium.org>2013-03-11 06:08:02 +0000
committerSimon Glass <sjg@chromium.org>2013-03-19 08:45:36 -0700
commitb5aec1424d191c51f694ba85d5577e7a635363d9 (patch)
tree0e1c5d4921e0e337dcffb6e4950210eff75806f1 /include/spi_flash.h
parentd3504fee73ec626117427afa08116d1dde21ba9d (diff)
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sf: Add spi_flash_alloc() to create a new SPI flash struct
At present it is difficult to extend the SPI flash structure since all devices allocate it themselves, and few of them zero all fields. Add a new function spi_flash_alloc() which can be used by SPI devices to perform this allocation, and thus ensure that all devices can better cope with SPI structure changes. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/spi_flash.h')
-rw-r--r--include/spi_flash.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/include/spi_flash.h b/include/spi_flash.h
index 9da9062..030d49c 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -47,6 +47,44 @@ struct spi_flash {
size_t len);
};
+/**
+ * spi_flash_do_alloc - Allocate a new spi flash structure
+ *
+ * The structure is allocated and cleared with default values for
+ * read, write and erase, which the caller can modify. The caller must set
+ * up size, page_size and sector_size.
+ *
+ * Use the helper macro spi_flash_alloc() to call this.
+ *
+ * @offset: Offset of struct spi_slave within slave structure
+ * @size: Size of slave structure
+ * @spi: SPI slave
+ * @name: Name of SPI flash device
+ */
+void *spi_flash_do_alloc(int offset, int size, struct spi_slave *spi,
+ const char *name);
+
+/**
+ * spi_flash_alloc - Allocate a new SPI flash structure
+ *
+ * @_struct: Name of structure to allocate (e.g. struct ramtron_spi_fram). This
+ * structure must contain a member 'struct spi_flash *flash'.
+ * @spi: SPI slave
+ * @name: Name of SPI flash device
+ */
+#define spi_flash_alloc(_struct, spi, name) \
+ spi_flash_do_alloc(offsetof(_struct, flash), sizeof(_struct), \
+ spi, name)
+
+/**
+ * spi_flash_alloc_base - Allocate a new SPI flash structure with no private data
+ *
+ * @spi: SPI slave
+ * @name: Name of SPI flash device
+ */
+#define spi_flash_alloc_base(spi, name) \
+ spi_flash_do_alloc(0, sizeof(struct spi_flash), spi, name)
+
struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int spi_mode);
void spi_flash_free(struct spi_flash *flash);