/*
 * Overall DMAC remains enabled always.
 *
 * Disabling individual channels could lose data.
 *
 * Disable the peripheral DMA after disabling the DMAC
 * in order to allow the DMAC FIFO to drain, and
 * hence allow the channel to show inactive
 *
 */
void pl08x_disable_dmac_chan(unsigned int ci)
{
	unsigned int reg;
	unsigned int chan_base = (unsigned int)pd.base
					+ PL08X_OS_CHAN_BASE;

	chan_base += ci * PL08X_OS_CHAN;

	/*
	 * Ignore subsequent requests
	 */
	reg = readl(chan_base + PL08X_OS_CCFG);
	reg |= PL08X_MASK_HALT;
	writel(reg, chan_base + PL08X_OS_CCFG);
    
	/* Wait for channel inactive */
	reg = readl(chan_base + PL08X_OS_CCFG);
	while (reg & PL08X_MASK_ACTIVE)
		reg = readl(chan_base + PL08X_OS_CCFG);

	reg = readl(chan_base + PL08X_OS_CCFG);
	reg &= ~PL08X_MASK_CEN;

	writel(reg, chan_base + PL08X_OS_CCFG);
	mb();

	return;
}