diff options
Diffstat (limited to 'include/spi.h')
| -rw-r--r-- | include/spi.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/include/spi.h b/include/spi.h index 320e50e529..01c9bb4a39 100644 --- a/include/spi.h +++ b/include/spi.h @@ -2,6 +2,8 @@ * (C) Copyright 2001 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com. * + * Copyright(c) 2009 Freescale Semiconductor, Inc + * * See file CREDITS for list of people who contributed to this * project. * @@ -50,16 +52,38 @@ #define SPI_XFER_END 0x02 /* Deassert CS after transfer */ /*----------------------------------------------------------------------- + * Representation of a eSPI transaction, which is always embeded in + * structure spi_slave. + * + * cmd_len: Length of the command. + * data_len: Length of the transmit/receive data. + * tx_buf: Buffer to store the transmit command and data. + * rx_buf: Buffer to store the receive data. + * flags: Flags to indicate the begin/end of the transfer. + */ +struct espi_transfer { + unsigned int cmd_len; + unsigned int data_len; + const void *tx_buf; + void *rx_buf; + + unsigned long flags; +}; + +/*----------------------------------------------------------------------- * Representation of a SPI slave, i.e. what we're communicating with. * * Drivers are expected to extend this with controller-specific data. * * bus: ID of the bus that the slave is attached to. * cs: ID of the chip select connected to the slave. + * transfer: Represent an eSPI transaction. */ struct spi_slave { unsigned int bus; unsigned int cs; + + struct espi_transfer *transfer; }; /*----------------------------------------------------------------------- @@ -148,6 +172,14 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, void *din, unsigned long flags); /*----------------------------------------------------------------------- + * eSPI transfer + * + * Returns: 0 on success, not 0 on failure + */ +int espi_xfer(struct spi_slave *slave); + + +/*----------------------------------------------------------------------- * Determine if a SPI chipselect is valid. * This function is provided by the board if the low-level SPI driver * needs it to determine if a given chipselect is actually valid. |