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author | Michael Williamson <michael.williamson@criticallink.com> | 2011-03-14 11:49:02 -0400 |
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committer | Grant Likely <grant.likely@secretlab.ca> | 2011-03-14 13:17:04 -0600 |
commit | b1178b21c6b9721a07fbd50762067a7c0ffa5a50 (patch) | |
tree | 048252f10af96adfc09c562214b51b0f4b4e0cae /drivers/spi/davinci_spi.c | |
parent | d09519e41a67eab22cc4566670431f9252b6786a (diff) | |
download | op-kernel-dev-b1178b21c6b9721a07fbd50762067a7c0ffa5a50.zip op-kernel-dev-b1178b21c6b9721a07fbd50762067a7c0ffa5a50.tar.gz |
spi/davinci: Support DMA transfers larger than 65535 words
The current davinci SPI driver, in DMA mode, is limited to 65535
words for a single transfer. Modify the driver by configuring a
3 dimensional EDMA transfer to support up to 65535x65535
words.
Signed-off-by: Michael Williamson <michael.williamson@criticallink.com>
Tested-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi/davinci_spi.c')
-rw-r--r-- | drivers/spi/davinci_spi.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c index 68ed377..e90c2d6 100644 --- a/drivers/spi/davinci_spi.c +++ b/drivers/spi/davinci_spi.c @@ -571,6 +571,7 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) unsigned long tx_reg, rx_reg; struct edmacc_param param; void *rx_buf; + int b, c; dma = &dspi->dma; @@ -599,14 +600,30 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) } } + /* + * If number of words is greater than 65535, then we need + * to configure a 3 dimension transfer. Use the BCNTRLD + * feature to allow for transfers that aren't even multiples + * of 65535 (or any other possible b size) by first transferring + * the remainder amount then grabbing the next N blocks of + * 65535 words. + */ + + c = dspi->wcount / (SZ_64K - 1); /* N 65535 Blocks */ + b = dspi->wcount - c * (SZ_64K - 1); /* Remainder */ + if (b) + c++; + else + b = SZ_64K - 1; + param.opt = TCINTEN | EDMA_TCC(dma->tx_channel); param.src = t->tx_buf ? t->tx_dma : tx_reg; - param.a_b_cnt = dspi->wcount << 16 | data_type; + param.a_b_cnt = b << 16 | data_type; param.dst = tx_reg; param.src_dst_bidx = t->tx_buf ? data_type : 0; - param.link_bcntrld = 0xffff; - param.src_dst_cidx = 0; - param.ccnt = 1; + param.link_bcntrld = 0xffffffff; + param.src_dst_cidx = t->tx_buf ? data_type : 0; + param.ccnt = c; edma_write_slot(dma->tx_channel, ¶m); edma_link(dma->tx_channel, dma->dummy_param_slot); @@ -643,12 +660,12 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) param.opt = TCINTEN | EDMA_TCC(dma->rx_channel); param.src = rx_reg; - param.a_b_cnt = dspi->rcount << 16 | data_type; + param.a_b_cnt = b << 16 | data_type; param.dst = t->rx_dma; param.src_dst_bidx = (t->rx_buf ? data_type : 0) << 16; - param.link_bcntrld = 0xffff; - param.src_dst_cidx = 0; - param.ccnt = 1; + param.link_bcntrld = 0xffffffff; + param.src_dst_cidx = (t->rx_buf ? data_type : 0) << 16; + param.ccnt = c; edma_write_slot(dma->rx_channel, ¶m); if (pdata->cshold_bug) |