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spi: davinci: use edma_write_slot() to setup EDMA PaRAM slot

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Currently a series of EDMA API calls are being made to setup
various aspects of EDMA PaRAM slots for receive and transmit.

Instead setup the PaRAM using a local structure and write once
to the hardware using edma_write_slot()

Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com>
Tested-By: Michael Williamson <michael.williamson@criticallink.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
Brian Niebuhr 2010-10-01 11:22:23 +05:30 committed by Sekhar Nori
parent e91c659bbc
commit 49fc3f497d
1 changed files with 19 additions and 15 deletions
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34
drivers/spi/davinci_spi.c
View file

@ -725,6 +725,7 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
struct davinci_spi_platform_data *pdata;
void *rx_buf;
struct device *sdev;
struct edmacc_param param;
davinci_spi = spi_master_get_devdata(spi->master);
pdata = davinci_spi->pdata;
@ -773,14 +774,15 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
}
}
edma_set_transfer_params(davinci_spi_dma->dma_tx_channel,
data_type, count, 1, 0, ASYNC);
edma_set_dest(davinci_spi_dma->dma_tx_channel, tx_reg, INCR, W8BIT);
edma_set_src(davinci_spi_dma->dma_tx_channel,
t->tx_buf ? t->tx_dma : tx_reg, INCR, W8BIT);
edma_set_src_index(davinci_spi_dma->dma_tx_channel,
t->tx_buf ? data_type : 0, 0);
edma_set_dest_index(davinci_spi_dma->dma_tx_channel, 0, 0);
param.opt = TCINTEN | EDMA_TCC(davinci_spi_dma->dma_tx_channel);
param.src = t->tx_buf ? t->tx_dma : tx_reg;
param.a_b_cnt = count << 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;
edma_write_slot(davinci_spi_dma->dma_tx_channel, &param);
/*
* Receive DMA setup
@ -812,13 +814,15 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
return -ENOMEM;
}
edma_set_transfer_params(davinci_spi_dma->dma_rx_channel, data_type,
count, 1, 0, ASYNC);
edma_set_src(davinci_spi_dma->dma_rx_channel, rx_reg, INCR, W8BIT);
edma_set_dest(davinci_spi_dma->dma_rx_channel, t->rx_dma, INCR, W8BIT);
edma_set_src_index(davinci_spi_dma->dma_rx_channel, 0, 0);
edma_set_dest_index(davinci_spi_dma->dma_rx_channel,
t->rx_buf ? data_type : 0, 0);
param.opt = TCINTEN | EDMA_TCC(davinci_spi_dma->dma_rx_channel);
param.src = rx_reg;
param.a_b_cnt = count << 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;
edma_write_slot(davinci_spi_dma->dma_rx_channel, &param);
if (pdata->cshold_bug) {
u16 spidat1 = ioread16(davinci_spi->base + SPIDAT1 + 2);