static int tegra_spi_dma_finish(struct tegra_spi_channel *spi)
{
int ret;
unsigned int todo;
struct apb_dma * const apb_dma = (struct apb_dma *)TEGRA_APB_DMA_BASE;
todo = read32(&spi->dma_in->regs->wcount);
if (spi->dma_in) {
while ((read32(&spi->dma_in->regs->dma_byte_sta) < todo) ||
dma_busy(spi->dma_in))
;
dma_stop(spi->dma_in);
clrbits_le32(&spi->regs->command1, SPI_CMD1_RX_EN);
/* Disable secure access for the channel. */
clrbits_le32(&apb_dma->security_reg,
SECURITY_EN_BIT(spi->dma_in->num));
dma_release(spi->dma_in);
}
if (spi->dma_out) {
while ((read32(&spi->dma_out->regs->dma_byte_sta) < todo) ||
dma_busy(spi->dma_out))
;
clrbits_le32(&spi->regs->command1, SPI_CMD1_TX_EN);
dma_stop(spi->dma_out);
/* Disable secure access for the channel. */
clrbits_le32(&apb_dma->security_reg,
SECURITY_EN_BIT(spi->dma_out->num));
dma_release(spi->dma_out);
}
if (fifo_error(spi)) {
printk(BIOS_ERR, "%s: ERROR:\n", __func__);
dump_dma_regs(spi->dma_out);
dump_dma_regs(spi->dma_in);
dump_spi_regs(spi);
dump_fifo_status(spi);
ret = -1;
goto done;
}
ret = 0;
done:
spi->dma_in = NULL;
spi->dma_out = NULL;
return ret;
}
static int tegra_spi_dma_finish(struct tegra_spi_channel *spi)
{
int ret;
unsigned int todo;
todo = read32(&spi->dma_in->regs->wcount);
if (spi->dma_in) {
while ((read32(&spi->dma_in->regs->dma_byte_sta) < todo) ||
dma_busy(spi->dma_in))
; /* this shouldn't take long, no udelay */
dma_stop(spi->dma_in);
clrbits_le32(&spi->regs->command1, SPI_CMD1_RX_EN);
dma_release(spi->dma_in);
}
if (spi->dma_out) {
while ((read32(&spi->dma_out->regs->dma_byte_sta) < todo) ||
dma_busy(spi->dma_out))
spi_delay(spi, todo - spi_byte_count(spi));
clrbits_le32(&spi->regs->command1, SPI_CMD1_TX_EN);
dma_stop(spi->dma_out);
dma_release(spi->dma_out);
}
if (fifo_error(spi)) {
printk(BIOS_ERR, "%s: ERROR:\n", __func__);
dump_dma_regs(spi->dma_out);
dump_dma_regs(spi->dma_in);
dump_spi_regs(spi);
dump_fifo_status(spi);
ret = -1;
goto done;
}
ret = 0;
done:
spi->dma_in = NULL;
spi->dma_out = NULL;
return ret;
}
/* release a DMA channel */
void dma_release(struct apb_dma_channel * const channel)
{
int i;
/* FIXME: make this "thread" friendly */
while (dma_busy(channel))
;
channel->in_use = 0;
/* clear the global enable bit if no channels are in use */
for (i = 0; i < ARRAY_SIZE(apb_dma_channels); i++) {
if (apb_dma_channels[i].in_use)
return;
}
clrbits_le32(&apb_dma->command, APB_COMMAND_GEN);
}
