Ejemplos de omap3_spi_write en C++ (Cpp)

Ejemplo n.º 1

Archivo: omap3_spi.c Proyecto: 675816156/uboot-2016-for-itop4412

static int _spi_xfer(struct omap3_spi_priv *priv, unsigned int bitlen,
		     const void *dout, void *din, unsigned long flags)
{
	unsigned int	len;
	int ret = -1;

	if (priv->wordlen < 4 || priv->wordlen > 32) {
		printf("omap3_spi: invalid wordlen %d\n", priv->wordlen);
		return -1;
	}

	if (bitlen % priv->wordlen)
		return -1;

	len = bitlen / priv->wordlen;

	if (bitlen == 0) {	 /* only change CS */
		int chconf = readl(&priv->regs->channel[priv->cs].chconf);

		if (flags & SPI_XFER_BEGIN) {
			omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
			chconf |= OMAP3_MCSPI_CHCONF_FORCE;
			omap3_spi_write_chconf(priv, chconf);
		}
		if (flags & SPI_XFER_END) {
			chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
			omap3_spi_write_chconf(priv, chconf);
			omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
		}
		ret = 0;
	} else {
		if (dout != NULL && din != NULL)
			ret = omap3_spi_txrx(priv, len, dout, din, flags);
		else if (dout != NULL)
			ret = omap3_spi_write(priv, len, dout, flags);
		else if (din != NULL)
			ret = omap3_spi_read(priv, len, din, flags);
	}
	return ret;
}

Ejemplo n.º 2

Archivo: omap3_spi.c Proyecto: azizazik/miniemc2

int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
	     const void *dout, void *din, unsigned long flags)
{
	struct omap3_spi_slave *ds = to_omap3_spi(slave);
	unsigned int	len;
	const u8	*txp = dout;
	u8		*rxp = din;
	int ret = -1;

	if (bitlen % 8)
		return -1;

	len = bitlen / 8;

	if (bitlen == 0) {	 /* only change CS */
		int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);

		if (flags & SPI_XFER_BEGIN) {
			writel(OMAP3_MCSPI_CHCTRL_EN,
			       &ds->regs->channel[ds->slave.cs].chctrl);
			chconf |= OMAP3_MCSPI_CHCONF_FORCE;
			writel(chconf,
			       &ds->regs->channel[ds->slave.cs].chconf);
		}
		if (flags & SPI_XFER_END) {
			chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
			writel(chconf,
			       &ds->regs->channel[ds->slave.cs].chconf);
			writel(0, &ds->regs->channel[ds->slave.cs].chctrl);
		}
		ret = 0;
	} else {
		if (dout != NULL)
			ret = omap3_spi_write(slave, len, txp, flags);

		if (din != NULL)
			ret = omap3_spi_read(slave, len, rxp, flags);
	}
	return ret;
}