diff options
| author | Furquan Shaikh <furquan@chromium.org> | 2016-12-01 07:12:32 -0800 |
|---|---|---|
| committer | Furquan Shaikh <furquan@google.com> | 2016-12-05 03:29:04 +0100 |
| commit | 94f8699d447ef94df339d318b836b664273e89ff (patch) | |
| tree | 17223ccd5906a8087251beabc943786cade37ee4 /src/soc/samsung | |
| parent | 36b81af9e8ecea2bf58aae9a421720ed10f61b82 (diff) | |
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.c | 45 |
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(®s->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) { |