diff options
| author | Poonam Aggrwal <poonam.aggrwal@freescale.com> | 2009-10-28 13:24:03 +0530 |
|---|---|---|
| committer | Scott Sweeny <scott.sweeny@timesys.com> | 2010-11-10 14:52:24 -0500 |
| commit | 1ed5bbfd3582857458074b474b495f4bd0db2e0d (patch) | |
| tree | 1c7cce33e9a091e3da9d4a535a3381aab9b25018 /include | |
| parent | 1b81b5d902fec7b67b244991770f085670e7a4a9 (diff) | |
eSPI controller support under the SPI framework.
This patch has been borrowed from MPC8536DS SPI Support.
Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/spi.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/spi.h b/include/spi.h index 320e50e5296..4f145edcc0f 100644 --- a/include/spi.h +++ b/include/spi.h @@ -1,6 +1,7 @@ /* * (C) Copyright 2001 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com. + * Copyright 2009 Freescale Semiconductor, Inc. * * See file CREDITS for list of people who contributed to this * project. @@ -50,16 +51,36 @@ #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 +169,12 @@ 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. |