From 94f8699d447ef94df339d318b836b664273e89ff Mon Sep 17 00:00:00 2001 From: Furquan Shaikh Date: Thu, 1 Dec 2016 07:12:32 -0800 Subject: spi: Define and use spi_ctrlr structure 1. Define a new structure spi_ctrlr that allows platforms to define callbacks for spi operations (claim bus, release bus, transfer). 2. Add a new member (pointer to spi_ctrlr structure) in spi_slave structure which will be initialized by call to spi_setup_slave. 3. Define spi_claim_bus, spi_release_bus and spi_xfer in spi-generic.c which will make appropriate calls to ctrlr functions. BUG=chrome-os-partner:59832 BRANCH=None TEST=Compiles successfully Change-Id: Icb2326e3aab1e8f4bef53f553f82b3836358c55e Signed-off-by: Furquan Shaikh Reviewed-on: https://review.coreboot.org/17684 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/drivers/spi/spi-generic.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 src/drivers/spi/spi-generic.c (limited to 'src/drivers/spi/spi-generic.c') diff --git a/src/drivers/spi/spi-generic.c b/src/drivers/spi/spi-generic.c new file mode 100644 index 0000000000..7398ee928f --- /dev/null +++ b/src/drivers/spi/spi-generic.c @@ -0,0 +1,43 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2016 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include + +int spi_claim_bus(const struct spi_slave *slave) +{ + const struct spi_ctrlr *ctrlr = slave->ctrlr; + if (ctrlr && ctrlr->claim_bus) + return ctrlr->claim_bus(slave); + return 0; +} + +void spi_release_bus(const struct spi_slave *slave) +{ + const struct spi_ctrlr *ctrlr = slave->ctrlr; + if (ctrlr && ctrlr->release_bus) + ctrlr->release_bus(slave); +} + +int spi_xfer(const struct spi_slave *slave, const void *dout, size_t bytesout, + void *din, size_t bytesin) +{ + const struct spi_ctrlr *ctrlr = slave->ctrlr; + if (ctrlr && ctrlr->xfer) + return ctrlr->xfer(slave, dout, bytesout, din, bytesin); + + return -1; +} -- cgit v1.2.3