spi: Pass pointer to spi_slave structure in spi_setup_slave

For spi_setup_slave, instead of making the platform driver return a
pointer to spi_slave structure, pass in a structure pointer that can be
filled in by the driver as required. This removes the need for platform
drivers to maintain a slave structure in data/CAR section.

BUG=chrome-os-partner:59832
BRANCH=None
TEST=Compiles successfully

Change-Id: Ia15a4f88ef4dcfdf616bb1c22261e7cb642a7573
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17683
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

2 files changed, 27 insertions, 12 deletions

diff --git a/src/soc/qualcomm/ipq40xx/include/soc/spi.h b/src/soc/qualcomm/ipq40xx/include/soc/spi.h
index 8ef1fbf69d..b91e6ca28f 100644
--- a/src/soc/qualcomm/ipq40xx/include/soc/spi.h
+++ b/src/soc/qualcomm/ipq40xx/include/soc/spi.h
@@ -186,9 +186,4 @@ struct ipq_spi_slave {
 	int allocated;
 };
 
-static inline struct ipq_spi_slave *to_ipq_spi(const struct spi_slave *slave)
-{
-	return container_of(slave, struct ipq_spi_slave, slave);
-}
-
 #endif /* _IPQ40XX_SPI_H_ */
diff --git a/src/soc/qualcomm/ipq40xx/spi.c b/src/soc/qualcomm/ipq40xx/spi.c
index 871f24b254..cda3bea7e6 100644
--- a/src/soc/qualcomm/ipq40xx/spi.c
+++ b/src/soc/qualcomm/ipq40xx/spi.c
@@ -207,7 +207,26 @@ void spi_init(void)
 	memset(spi_slave_pool, 0, sizeof(spi_slave_pool));
 }
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+static struct ipq_spi_slave *to_ipq_spi(const struct spi_slave *slave)
+{
+	struct ipq_spi_slave *ds;
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(spi_slave_pool); i++) {
+		ds = spi_slave_pool + i;
+
+		if (!ds->allocated)
+			continue;
+
+		if ((ds->slave.bus == slave->bus) &&
+		    (ds->slave.cs == slave->cs))
+			return ds;
+	}
+
+	return NULL;
+}
+
+int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
 {
 	struct ipq_spi_slave *ds = NULL;
 	int i;
@@ -218,16 +237,17 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
 		printk(BIOS_ERR,
 			"SPI error: unsupported bus %d (Supported busses 0, 1 and 2) "
                         "or chipselect\n", bus);
-		return NULL;
+		return -1;
 	}
 
 	for (i = 0; i < ARRAY_SIZE(spi_slave_pool); i++) {
 		if (spi_slave_pool[i].allocated)
 			continue;
 		ds = spi_slave_pool + i;
-		ds->slave.bus	= bus;
-		ds->slave.cs	= cs;
-		ds->regs	= &spi_reg[bus];
+
+		ds->slave.bus = slave->bus = bus;
+		ds->slave.cs = slave->cs = cs;
+		ds->regs = &spi_reg[bus];
 
 		/*
 		 * TODO(vbendeb):
@@ -238,11 +258,11 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
 		ds->mode = SPI_MODE3;
 		ds->allocated = 1;
 
-		return &ds->slave;
+		return 0;
 	}
 
 	printk(BIOS_ERR, "SPI error: all %d pools busy\n", i);
-	return NULL;
+	return -1;
 }
 
 /*