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spi: omap2-mcspi: Fix transfers if DMADEVICES is not set

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Selecting CONFIG_DMADEVICES is optional, and we must
be able to continue even without DMA. Otherwise things
like omap4430sdp nfsroot will fail if DMA is not
selected.

Note that the driver already supports PIO mode, but
we fail to fall back to PIO if requesting DMA channels
fails.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Tony Lindgren 2013-04-12 17:25:07 -07:00 committed by Mark Brown
parent 788437273f
commit ddc5cdf161
1 changed files with 22 additions and 10 deletions
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32
drivers/spi/spi-omap2-mcspi.c
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@ -809,6 +809,10 @@ static int omap2_mcspi_setup_transfer(struct spi_device *spi,
return 0;
}
/*
* Note that we currently allow DMA only if we get a channel
* for both rx and tx. Otherwise we'll do PIO for both rx and tx.
*/
static int omap2_mcspi_request_dma(struct spi_device *spi)
{
struct spi_master *master = spi->master;
@ -827,21 +831,22 @@ static int omap2_mcspi_request_dma(struct spi_device *spi)
dma_cap_set(DMA_SLAVE, mask);
sig = mcspi_dma->dma_rx_sync_dev;
mcspi_dma->dma_rx = dma_request_channel(mask, omap_dma_filter_fn, &sig);
if (!mcspi_dma->dma_rx) {
dev_err(&spi->dev, "no RX DMA engine channel for McSPI\n");
return -EAGAIN;
}
if (!mcspi_dma->dma_rx)
goto no_dma;
sig = mcspi_dma->dma_tx_sync_dev;
mcspi_dma->dma_tx = dma_request_channel(mask, omap_dma_filter_fn, &sig);
if (!mcspi_dma->dma_tx) {
dev_err(&spi->dev, "no TX DMA engine channel for McSPI\n");
dma_release_channel(mcspi_dma->dma_rx);
mcspi_dma->dma_rx = NULL;
return -EAGAIN;
goto no_dma;
}
return 0;
no_dma:
dev_warn(&spi->dev, "not using DMA for McSPI\n");
return -EAGAIN;
}
static int omap2_mcspi_setup(struct spi_device *spi)
@ -874,7 +879,7 @@ static int omap2_mcspi_setup(struct spi_device *spi)
if (!mcspi_dma->dma_rx || !mcspi_dma->dma_tx) {
ret = omap2_mcspi_request_dma(spi);
if (ret < 0)
if (ret < 0 && ret != -EAGAIN)
return ret;
}
@ -932,6 +937,7 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
struct spi_device *spi;
struct spi_transfer *t = NULL;
struct spi_master *master;
struct omap2_mcspi_dma *mcspi_dma;
int cs_active = 0;
struct omap2_mcspi_cs *cs;
struct omap2_mcspi_device_config *cd;
@ -941,6 +947,7 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
spi = m->spi;
master = spi->master;
mcspi_dma = mcspi->dma_channels + spi->chip_select;
cs = spi->controller_state;
cd = spi->controller_data;
@ -997,7 +1004,8 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
__raw_writel(0, cs->base
+ OMAP2_MCSPI_TX0);
if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&
(m->is_dma_mapped || t->len >= DMA_MIN_BYTES))
count = omap2_mcspi_txrx_dma(spi, t);
else
count = omap2_mcspi_txrx_pio(spi, t);
@ -1044,10 +1052,14 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
static int omap2_mcspi_transfer_one_message(struct spi_master *master,
struct spi_message *m)
{
struct spi_device *spi;
struct omap2_mcspi *mcspi;
struct omap2_mcspi_dma *mcspi_dma;
struct spi_transfer *t;
spi = m->spi;
mcspi = spi_master_get_devdata(master);
mcspi_dma = mcspi->dma_channels + spi->chip_select;
m->actual_length = 0;
m->status = 0;
@ -1082,7 +1094,7 @@ static int omap2_mcspi_transfer_one_message(struct spi_master *master,
if (m->is_dma_mapped || len < DMA_MIN_BYTES)
continue;
if (tx_buf != NULL) {
if (mcspi_dma->dma_tx && tx_buf != NULL) {
t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
len, DMA_TO_DEVICE);
if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
@ -1091,7 +1103,7 @@ static int omap2_mcspi_transfer_one_message(struct spi_master *master,
return -EINVAL;
}
}
if (rx_buf != NULL) {
if (mcspi_dma->dma_rx && rx_buf != NULL) {
t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len,
DMA_FROM_DEVICE);
if (dma_mapping_error(mcspi->dev, t->rx_dma)) {