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Blackfin SPI Driver: unify duplicated code in dma read/write paths 

For DMA TX/RX operation in pump_transfers, DMA contriguration code in TX
and RX paths are almost the same.  This patch unify the duplicated DMA
code to make it more readable.

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Frysinger 2009-04-06 19:00:36 -07:00 committed by Linus Torvalds
parent 04b95d2f74
commit 7aec356617
1 changed files with 21 additions and 26 deletions
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47
drivers/spi/spi_bfin5xx.c
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@ -756,18 +756,19 @@ static void pump_transfers(unsigned long data)
if (!full_duplex && drv_data->cur_chip->enable_dma
&& drv_data->len > 6) {
unsigned long dma_start_addr;
disable_dma(drv_data->dma_channel);
clear_dma_irqstat(drv_data->dma_channel);
bfin_spi_disable(drv_data);
/* config dma channel */
dev_dbg(&drv_data->pdev->dev, "doing dma transfer\n");
set_dma_x_count(drv_data->dma_channel, drv_data->len);
if (width == CFG_SPI_WORDSIZE16) {
set_dma_x_count(drv_data->dma_channel, drv_data->len);
set_dma_x_modify(drv_data->dma_channel, 2);
dma_width = WDSIZE_16;
} else {
set_dma_x_count(drv_data->dma_channel, drv_data->len);
set_dma_x_modify(drv_data->dma_channel, 1);
dma_width = WDSIZE_8;
}
@ -802,6 +803,7 @@ static void pump_transfers(unsigned long data)
}
/* In dma mode, rx or tx must be NULL in one transfer */
dma_config = (RESTART | dma_width | DI_EN);
if (drv_data->rx != NULL) {
/* set transfer mode, and enable SPI */
dev_dbg(&drv_data->pdev->dev, "doing DMA in.\n");
@ -815,19 +817,9 @@ static void pump_transfers(unsigned long data)
/* clear tx reg soformer data is not shifted out */
write_TDBR(drv_data, 0xFFFF);
set_dma_x_count(drv_data->dma_channel, drv_data->len);
/* start dma */
dma_enable_irq(drv_data->dma_channel);
dma_config = (WNR | RESTART | dma_width | DI_EN);
set_dma_config(drv_data->dma_channel, dma_config);
set_dma_start_addr(drv_data->dma_channel,
(unsigned long)drv_data->rx);
enable_dma(drv_data->dma_channel);
/* start SPI transfer */
write_CTRL(drv_data,
(cr | CFG_SPI_DMAREAD | BIT_CTL_ENABLE));
dma_config |= WNR;
dma_start_addr = (unsigned long)drv_data->rx;
cr |= CFG_SPI_DMAREAD;
} else if (drv_data->tx != NULL) {
dev_dbg(&drv_data->pdev->dev, "doing DMA out.\n");
@ -838,18 +830,21 @@ static void pump_transfers(unsigned long data)
(unsigned long) (drv_data->tx +
drv_data->len_in_bytes));
/* start dma */
dma_enable_irq(drv_data->dma_channel);
dma_config = (RESTART | dma_width | DI_EN);
set_dma_config(drv_data->dma_channel, dma_config);
set_dma_start_addr(drv_data->dma_channel,
(unsigned long)drv_data->tx);
enable_dma(drv_data->dma_channel);
dma_start_addr = (unsigned long)drv_data->tx;
cr |= CFG_SPI_DMAWRITE;
} else
BUG();
/* start dma */
dma_enable_irq(drv_data->dma_channel);
set_dma_config(drv_data->dma_channel, dma_config);
set_dma_start_addr(drv_data->dma_channel, dma_start_addr);
enable_dma(drv_data->dma_channel);
/* start SPI transfer */
write_CTRL(drv_data, (cr | BIT_CTL_ENABLE));
/* start SPI transfer */
write_CTRL(drv_data,
(cr | CFG_SPI_DMAWRITE | BIT_CTL_ENABLE));
}
} else {
/* IO mode write then read */
dev_dbg(&drv_data->pdev->dev, "doing IO transfer\n");