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author | Michael Brown | 2006-12-04 16:36:51 +0100 |
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committer | Michael Brown | 2006-12-04 16:36:51 +0100 |
commit | 931f94dca30b04f8303acdcfd08436e61a491a92 (patch) | |
tree | b478b672436d696ce8d0a4d91c804d29a65db6a9 /src/include/gpxe/spi_bit.h | |
parent | Force syntax-checking on assertions even in non-asserting builds. (diff) | |
download | ipxe-931f94dca30b04f8303acdcfd08436e61a491a92.tar.gz ipxe-931f94dca30b04f8303acdcfd08436e61a491a92.tar.xz ipxe-931f94dca30b04f8303acdcfd08436e61a491a92.zip |
Generalised the SPI abstraction layer to also be able to handle interfaces
that don't provide the full flexibility of a bit-bashing interface.
Temporarily hacked rtl8139.c to use the new interface.
Diffstat (limited to 'src/include/gpxe/spi_bit.h')
-rw-r--r-- | src/include/gpxe/spi_bit.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/include/gpxe/spi_bit.h b/src/include/gpxe/spi_bit.h new file mode 100644 index 00000000..46f6af76 --- /dev/null +++ b/src/include/gpxe/spi_bit.h @@ -0,0 +1,45 @@ +#ifndef _GPXE_SPI_BIT_H +#define _GPXE_SPI_BIT_H + +/** @file + * + * SPI bit-bashing interface + * + */ + +#include <gpxe/spi.h> + +/** A bit-bashing SPI bus */ +struct spi_bit_basher { + /** SPI bus */ + struct spi_bus bus; + /** Bit-bashing interface */ + struct bit_basher basher; +}; + +/** Bit indices used for SPI bit-bashing interface */ +enum { + /** Serial clock */ + SPI_BIT_SCLK = 0, + /** Master Out Slave In */ + SPI_BIT_MOSI, + /** Master In Slave Out */ + SPI_BIT_MISO, + /** Slave 0 select */ + SPI_BIT_SS0, +}; + +/** + * Determine bit index for a particular slave + * + * @v slave Slave number + * @ret index Bit index (i.e. SPI_BIT_SSN, where N=slave) + */ +#define SPI_BIT_SS( slave ) ( SPI_BIT_SS0 + (slave) ) + +/** Delay between SCLK transitions */ +#define SPI_BIT_UDELAY 1 + +extern void init_spi_bit_basher ( struct spi_bit_basher *spibit ); + +#endif /* _GPXE_SPI_BIT_H */ |