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authorFurquan Shaikh <furquan@chromium.org>2016-12-01 07:12:32 -0800
committerFurquan Shaikh <furquan@google.com>2016-12-05 03:29:04 +0100
commit94f8699d447ef94df339d318b836b664273e89ff (patch)
tree17223ccd5906a8087251beabc943786cade37ee4 /src/soc/samsung
parent36b81af9e8ecea2bf58aae9a421720ed10f61b82 (diff)
downloadcoreboot-94f8699d447ef94df339d318b836b664273e89ff.tar.xz
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 <furquan@chromium.org> Reviewed-on: https://review.coreboot.org/17684 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/soc/samsung')
-rw-r--r--src/soc/samsung/exynos5420/spi.c45
1 files changed, 26 insertions, 19 deletions
diff --git a/src/soc/samsung/exynos5420/spi.c b/src/soc/samsung/exynos5420/spi.c
index 5dbe024f71..f17566e2c5 100644
--- a/src/soc/samsung/exynos5420/spi.c
+++ b/src/soc/samsung/exynos5420/spi.c
@@ -117,23 +117,7 @@ static void exynos_spi_init(struct exynos_spi *regs)
spi_sw_reset(regs, 1);
}
-int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
-{
- ASSERT(bus >= 0 && bus < 3);
- struct exynos_spi_slave *eslave;
-
- slave->bus = bus;
- slave->cs = cs;
-
- eslave = to_exynos_spi(slave);
- if (!eslave->initialized) {
- exynos_spi_init(eslave->regs);
- eslave->initialized = 1;
- }
- return 0;
-}
-
-int spi_claim_bus(const struct spi_slave *slave)
+static int spi_ctrlr_claim_bus(const struct spi_slave *slave)
{
struct exynos_spi *regs = to_exynos_spi(slave)->regs;
// TODO(hungte) Add some delay if too many transactions happen at once.
@@ -193,7 +177,7 @@ static void spi_transfer(struct exynos_spi *regs, void *in, const void *out,
}
}
-int spi_xfer(const struct spi_slave *slave, const void *dout, size_t bytes_out,
+static int spi_ctrlr_xfer(const struct spi_slave *slave, const void *dout, size_t bytes_out,
void *din, size_t bytes_in)
{
struct exynos_spi *regs = to_exynos_spi(slave)->regs;
@@ -218,12 +202,35 @@ int spi_xfer(const struct spi_slave *slave, const void *dout, size_t bytes_out,
return 0;
}
-void spi_release_bus(const struct spi_slave *slave)
+static void spi_ctrlr_release_bus(const struct spi_slave *slave)
{
struct exynos_spi *regs = to_exynos_spi(slave)->regs;
setbits_le32(&regs->cs_reg, SPI_SLAVE_SIG_INACT);
}
+static const struct spi_ctrlr spi_ctrlr = {
+ .claim_bus = spi_ctrlr_claim_bus,
+ .release_bus = spi_ctrlr_release_bus,
+ .xfer = spi_ctrlr_xfer,
+};
+
+int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
+{
+ ASSERT(bus >= 0 && bus < 3);
+ struct exynos_spi_slave *eslave;
+
+ slave->bus = bus;
+ slave->cs = cs;
+ slave->ctrlr = &spi_ctrlr;
+
+ eslave = to_exynos_spi(slave);
+ if (!eslave->initialized) {
+ exynos_spi_init(eslave->regs);
+ eslave->initialized = 1;
+ }
+ return 0;
+}
+
static int exynos_spi_read(struct spi_slave *slave, void *dest, uint32_t len,
uint32_t off)
{