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Assert CS for single transfers.

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This commit is contained in:
Ruslan Bukin 2016-04-19 15:36:18 +00:00
parent c4839d320a
commit d1bdbe1259
1 changed files with 11 additions and 30 deletions
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41
sys/dev/xilinx/axi_quad_spi.c
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@ -122,33 +122,6 @@ spi_probe(device_t dev)
return (BUS_PROBE_DEFAULT);
}
static int
spi_chip_select(device_t dev, device_t child)
{
struct spi_softc *sc;
uint32_t cs;
sc = device_get_softc(dev);
spibus_get_cs(child, &cs);
WRITE4(sc, SPI_SSR, ~(1 << cs));
return (0);
}
static int
spi_chip_deselect(device_t dev, device_t child)
{
struct spi_softc *sc;
sc = device_get_softc(dev);
WRITE4(sc, SPI_SSR, ~0);
return (0);
}
static int
spi_attach(device_t dev)
{
@ -207,6 +180,7 @@ static int
spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
{
struct spi_softc *sc;
uint32_t reg;
uint32_t cs;
sc = device_get_softc(dev);
@ -219,12 +193,22 @@ spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
/* get the proper chip select */
spibus_get_cs(child, &cs);
/* Assert CS */
reg = READ4(sc, SPI_SSR);
reg &= ~(1 << cs);
WRITE4(sc, SPI_SSR, reg);
/* Command */
spi_txrx(sc, cmd->tx_cmd, cmd->rx_cmd, cmd->tx_cmd_sz, cs);
/* Data */
spi_txrx(sc, cmd->tx_data, cmd->rx_data, cmd->tx_data_sz, cs);
/* Deassert CS */
reg = READ4(sc, SPI_SSR);
reg |= (1 << cs);
WRITE4(sc, SPI_SSR, reg);
return (0);
}
@ -235,9 +219,6 @@ static device_method_t spi_methods[] = {
/* SPI interface */
DEVMETHOD(spibus_transfer, spi_transfer),
DEVMETHOD(spibus_chip_select, spi_chip_select),
DEVMETHOD(spibus_chip_deselect, spi_chip_deselect),
DEVMETHOD_END
};