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New i.MX31 SPI driver

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This is an SPI driver for i.MX and MXC based SoCs from Freescale. So far
only implemented and tested on i.MX31, can with a modified register layout
and definitions be used for i.MX27, I think, MXC CPUs have similar SPI
controllers too.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
This commit is contained in:
Guennadi Liakhovetski
2008-04-15 14:14:25 +02:00
committed by Wolfgang Denk
parent 248b7d984c
commit 38254f45b0
5 changed files with 193 additions and 2 deletions
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16
include/spi.h
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@@ -24,6 +24,18 @@
#ifndef _SPI_H_
#define _SPI_H_
/* SPI mode flags */
#define SPI_CPHA 0x01 /* clock phase */
#define SPI_CPOL 0x02 /* clock polarity */
#define SPI_MODE_0 (0|0) /* (original MicroWire) */
#define SPI_MODE_1 (0|SPI_CPHA)
#define SPI_MODE_2 (SPI_CPOL|0)
#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
#define SPI_CS_HIGH 0x04 /* chipselect active high? */
#define SPI_LSB_FIRST 0x08 /* per-word bits-on-wire */
#define SPI_3WIRE 0x10 /* SI/SO signals shared */
#define SPI_LOOP 0x20 /* loopback mode */
/*
* The function call pointer type used to drive the chip select.
*/
@@ -68,6 +80,8 @@ void spi_init(void);
*
* Returns: 0 on success, not 0 on failure
*/
int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din);
int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din);
int spi_select(unsigned int bus, unsigned int dev, unsigned long mode);
#endif /* _SPI_H_ */