diff options
author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-04-23 13:56:25 +0100 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-07-31 12:06:24 +0100 |
commit | 8c7494a501bd45e1bf1599a51331b1c210cadbae (patch) | |
tree | 844a4b6739b38c3c14506d7fa090c94292312755 /drivers/spi | |
parent | 53741ed8f0a3fc646576b6d7adf563f403ba6c03 (diff) | |
download | lwn-8c7494a501bd45e1bf1599a51331b1c210cadbae.tar.gz lwn-8c7494a501bd45e1bf1599a51331b1c210cadbae.zip |
spi: omap2-mcspi: remove private DMA API implementation
Remove the private DMA API implementation from spi-omap2-mcspi.c,
making it use entirely the DMA engine API.
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/spi')
-rw-r--r-- | drivers/spi/spi-omap2-mcspi.c | 104 |
1 files changed, 5 insertions, 99 deletions
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c index 9fdb7a9ae03f..26a99ae9a599 100644 --- a/drivers/spi/spi-omap2-mcspi.c +++ b/drivers/spi/spi-omap2-mcspi.c @@ -20,8 +20,6 @@ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ -#define USE_DMA_ENGINE_RX -#define USE_DMA_ENGINE_TX #include <linux/kernel.h> #include <linux/init.h> @@ -43,7 +41,6 @@ #include <linux/spi/spi.h> -#include <plat/dma.h> #include <plat/clock.h> #include <plat/mcspi.h> @@ -99,8 +96,6 @@ struct omap2_mcspi_dma { struct dma_chan *dma_tx; struct dma_chan *dma_rx; - int dma_tx_channel; - int dma_rx_channel; int dma_tx_sync_dev; int dma_rx_sync_dev; @@ -336,9 +331,8 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer) struct omap2_mcspi *mcspi; struct omap2_mcspi_cs *cs = spi->controller_state; struct omap2_mcspi_dma *mcspi_dma; - unsigned int count, c; - unsigned long base, tx_reg, rx_reg; - int word_len, data_type, element_count; + unsigned int count; + int word_len, element_count; int elements = 0; u32 l; u8 * rx; @@ -420,73 +414,26 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer) } count = xfer->len; - c = count; word_len = cs->word_len; - base = cs->phys; - tx_reg = base + OMAP2_MCSPI_TX0; - rx_reg = base + OMAP2_MCSPI_RX0; rx = xfer->rx_buf; tx = xfer->tx_buf; if (word_len <= 8) { - data_type = OMAP_DMA_DATA_TYPE_S8; element_count = count; } else if (word_len <= 16) { - data_type = OMAP_DMA_DATA_TYPE_S16; element_count = count >> 1; } else /* word_len <= 32 */ { - data_type = OMAP_DMA_DATA_TYPE_S32; element_count = count >> 2; } - if (tx != NULL && mcspi_dma->dma_tx_channel != -1) { - omap_set_dma_transfer_params(mcspi_dma->dma_tx_channel, - data_type, element_count, 1, - OMAP_DMA_SYNC_ELEMENT, - mcspi_dma->dma_tx_sync_dev, 0); - - omap_set_dma_dest_params(mcspi_dma->dma_tx_channel, 0, - OMAP_DMA_AMODE_CONSTANT, - tx_reg, 0, 0); - - omap_set_dma_src_params(mcspi_dma->dma_tx_channel, 0, - OMAP_DMA_AMODE_POST_INC, - xfer->tx_dma, 0, 0); - } - - if (rx != NULL && mcspi_dma->dma_rx_channel != -1) { - elements = element_count - 1; - if (l & OMAP2_MCSPI_CHCONF_TURBO) - elements--; - - omap_set_dma_transfer_params(mcspi_dma->dma_rx_channel, - data_type, elements, 1, - OMAP_DMA_SYNC_ELEMENT, - mcspi_dma->dma_rx_sync_dev, 1); - - omap_set_dma_src_params(mcspi_dma->dma_rx_channel, 0, - OMAP_DMA_AMODE_CONSTANT, - rx_reg, 0, 0); - - omap_set_dma_dest_params(mcspi_dma->dma_rx_channel, 0, - OMAP_DMA_AMODE_POST_INC, - xfer->rx_dma, 0, 0); - } - if (tx != NULL) { - if (mcspi_dma->dma_tx) - dma_async_issue_pending(mcspi_dma->dma_tx); - else - omap_start_dma(mcspi_dma->dma_tx_channel); + dma_async_issue_pending(mcspi_dma->dma_tx); omap2_mcspi_set_dma_req(spi, 0, 1); } if (rx != NULL) { - if (mcspi_dma->dma_rx) - dma_async_issue_pending(mcspi_dma->dma_rx); - else - omap_start_dma(mcspi_dma->dma_rx_channel); + dma_async_issue_pending(mcspi_dma->dma_rx); omap2_mcspi_set_dma_req(spi, 1, 1); } @@ -830,16 +777,6 @@ static int omap2_mcspi_setup_transfer(struct spi_device *spi, return 0; } -static void omap2_mcspi_dma_rx_callback(int lch, u16 ch_status, void *data) -{ - omap2_mcspi_rx_callback(data); -} - -static void omap2_mcspi_dma_tx_callback(int lch, u16 ch_status, void *data) -{ - omap2_mcspi_tx_callback(data); -} - static int omap2_mcspi_request_dma(struct spi_device *spi) { struct spi_master *master = spi->master; @@ -856,23 +793,13 @@ static int omap2_mcspi_request_dma(struct spi_device *spi) dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); -#ifdef USE_DMA_ENGINE_RX 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; } -#else - if (omap_request_dma(mcspi_dma->dma_rx_sync_dev, "McSPI RX", - omap2_mcspi_dma_rx_callback, spi, - &mcspi_dma->dma_rx_channel)) { - dev_err(&spi->dev, "no RX DMA channel for McSPI\n"); - return -EAGAIN; - } -#endif -#ifdef USE_DMA_ENGINE_TX 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) { @@ -881,16 +808,6 @@ static int omap2_mcspi_request_dma(struct spi_device *spi) mcspi_dma->dma_rx = NULL; return -EAGAIN; } -#else - if (omap_request_dma(mcspi_dma->dma_tx_sync_dev, "McSPI TX", - omap2_mcspi_dma_tx_callback, spi, - &mcspi_dma->dma_tx_channel)) { - omap_free_dma(mcspi_dma->dma_rx_channel); - mcspi_dma->dma_rx_channel = -1; - dev_err(&spi->dev, "no TX DMA channel for McSPI\n"); - return -EAGAIN; - } -#endif return 0; } @@ -923,8 +840,7 @@ static int omap2_mcspi_setup(struct spi_device *spi) list_add_tail(&cs->node, &ctx->cs); } - if ((!mcspi_dma->dma_rx && mcspi_dma->dma_rx_channel == -1) || - (!mcspi_dma->dma_tx && mcspi_dma->dma_tx_channel == -1)) { + if (!mcspi_dma->dma_rx || !mcspi_dma->dma_tx) { ret = omap2_mcspi_request_dma(spi); if (ret < 0) return ret; @@ -967,14 +883,6 @@ static void omap2_mcspi_cleanup(struct spi_device *spi) dma_release_channel(mcspi_dma->dma_tx); mcspi_dma->dma_tx = NULL; } - if (mcspi_dma->dma_rx_channel != -1) { - omap_free_dma(mcspi_dma->dma_rx_channel); - mcspi_dma->dma_rx_channel = -1; - } - if (mcspi_dma->dma_tx_channel != -1) { - omap_free_dma(mcspi_dma->dma_tx_channel); - mcspi_dma->dma_tx_channel = -1; - } } } @@ -1293,7 +1201,6 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev) break; } - mcspi->dma_channels[i].dma_rx_channel = -1; mcspi->dma_channels[i].dma_rx_sync_dev = dma_res->start; sprintf(dma_ch_name, "tx%d", i); dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA, @@ -1304,7 +1211,6 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev) break; } - mcspi->dma_channels[i].dma_tx_channel = -1; mcspi->dma_channels[i].dma_tx_sync_dev = dma_res->start; } |