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spi/spi-atmel: BUG: fix doesn' support 16 bits transfers using PIO

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Fix using PIO transfer mode only support 8 bits transfer, doesn't support 16 bits.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
[wenyou.yang@atmel.com: submit the patch]
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Richard Genoud 2013-05-02 19:25:11 +08:00 committed by Mark Brown
parent cd8d984f0d
commit f557c98b16
1 changed files with 38 additions and 9 deletions
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47
drivers/spi/spi-atmel.c
View file

@ -526,13 +526,17 @@ static void atmel_spi_next_xfer_pio(struct spi_master *master,
}
if (xfer->tx_buf)
spi_writel(as, TDR, *(u8 *)(xfer->tx_buf));
if (xfer->bits_per_word > 8)
spi_writel(as, TDR, *(u16 *)(xfer->tx_buf));
else
spi_writel(as, TDR, *(u8 *)(xfer->tx_buf));
else
spi_writel(as, TDR, 0);
dev_dbg(master->dev.parent,
" start pio xfer %p: len %u tx %p rx %p\n",
xfer, xfer->len, xfer->tx_buf, xfer->rx_buf);
" start pio xfer %p: len %u tx %p rx %p bitpw %d\n",
xfer, xfer->len, xfer->tx_buf, xfer->rx_buf,
xfer->bits_per_word);
/* Enable relevant interrupts */
spi_writel(as, IER, SPI_BIT(RDRF) | SPI_BIT(OVRES));
@ -950,21 +954,39 @@ atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
{
u8 *txp;
u8 *rxp;
u16 *txp16;
u16 *rxp16;
unsigned long xfer_pos = xfer->len - as->current_remaining_bytes;
if (xfer->rx_buf) {
rxp = ((u8 *)xfer->rx_buf) + xfer_pos;
*rxp = spi_readl(as, RDR);
if (xfer->bits_per_word > 8) {
rxp16 = (u16 *)(((u8 *)xfer->rx_buf) + xfer_pos);
*rxp16 = spi_readl(as, RDR);
} else {
rxp = ((u8 *)xfer->rx_buf) + xfer_pos;
*rxp = spi_readl(as, RDR);
}
} else {
spi_readl(as, RDR);
}
as->current_remaining_bytes--;
if (xfer->bits_per_word > 8) {
as->current_remaining_bytes -= 2;
if (as->current_remaining_bytes < 0)
as->current_remaining_bytes = 0;
} else {
as->current_remaining_bytes--;
}
if (as->current_remaining_bytes) {
if (xfer->tx_buf) {
txp = ((u8 *)xfer->tx_buf) + xfer_pos + 1;
spi_writel(as, TDR, *txp);
if (xfer->bits_per_word > 8) {
txp16 = (u16 *)(((u8 *)xfer->tx_buf)
+ xfer_pos + 2);
spi_writel(as, TDR, *txp16);
} else {
txp = ((u8 *)xfer->tx_buf) + xfer_pos + 1;
spi_writel(as, TDR, *txp);
}
} else {
spi_writel(as, TDR, 0);
}
@ -1378,6 +1400,13 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg)
}
}
if (xfer->bits_per_word > 8) {
if (xfer->len % 2) {
dev_dbg(&spi->dev, "buffer len should be 16 bits aligned\n");
return -EINVAL;
}
}
/* FIXME implement these protocol options!! */
if (xfer->speed_hz) {
dev_dbg(&spi->dev, "no protocol options yet\n");