From e826a7ff69b285ea295144303653c01f781ea9dc Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Wed, 8 Jan 2014 16:00:04 +0800 Subject: [PATCH] spi: oc-tiny: Simplify tiny_spi_txrx_bufs implementation when irq is not used Currently we have similar code for (txp && rxp), (txp && !rxp), (!rxp & txp), and (!txp && !rxp) cases. This patch refactors the code a bit to avoid duplicate similar code. Signed-off-by: Axel Lin Signed-off-by: Mark Brown --- drivers/spi/spi-oc-tiny.c | 62 +++++++++-------------------------------------- 1 file changed, 11 insertions(+), 51 deletions(-) diff --git a/drivers/spi/spi-oc-tiny.c b/drivers/spi/spi-oc-tiny.c index 91c6685..f7c896e 100644 --- a/drivers/spi/spi-oc-tiny.c +++ b/drivers/spi/spi-oc-tiny.c @@ -153,62 +153,22 @@ static int tiny_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) } wait_for_completion(&hw->done); - } else if (txp && rxp) { - /* we need to tighten the transfer loop */ - writeb(*txp++, hw->base + TINY_SPI_TXDATA); - if (t->len > 1) { - writeb(*txp++, hw->base + TINY_SPI_TXDATA); - for (i = 2; i < t->len; i++) { - u8 rx, tx = *txp++; - tiny_spi_wait_txr(hw); - rx = readb(hw->base + TINY_SPI_TXDATA); - writeb(tx, hw->base + TINY_SPI_TXDATA); - *rxp++ = rx; - } - tiny_spi_wait_txr(hw); - *rxp++ = readb(hw->base + TINY_SPI_TXDATA); - } - tiny_spi_wait_txe(hw); - *rxp++ = readb(hw->base + TINY_SPI_RXDATA); - } else if (rxp) { - writeb(0, hw->base + TINY_SPI_TXDATA); - if (t->len > 1) { - writeb(0, - hw->base + TINY_SPI_TXDATA); - for (i = 2; i < t->len; i++) { - u8 rx; - tiny_spi_wait_txr(hw); - rx = readb(hw->base + TINY_SPI_TXDATA); - writeb(0, hw->base + TINY_SPI_TXDATA); - *rxp++ = rx; - } - tiny_spi_wait_txr(hw); - *rxp++ = readb(hw->base + TINY_SPI_TXDATA); - } - tiny_spi_wait_txe(hw); - *rxp++ = readb(hw->base + TINY_SPI_RXDATA); - } else if (txp) { - writeb(*txp++, hw->base + TINY_SPI_TXDATA); - if (t->len > 1) { - writeb(*txp++, hw->base + TINY_SPI_TXDATA); - for (i = 2; i < t->len; i++) { - u8 tx = *txp++; - tiny_spi_wait_txr(hw); - writeb(tx, hw->base + TINY_SPI_TXDATA); - } - } - tiny_spi_wait_txe(hw); } else { - writeb(0, hw->base + TINY_SPI_TXDATA); - if (t->len > 1) { - writeb(0, hw->base + TINY_SPI_TXDATA); - for (i = 2; i < t->len; i++) { + /* we need to tighten the transfer loop */ + writeb(txp ? *txp++ : 0, hw->base + TINY_SPI_TXDATA); + for (i = 1; i < t->len; i++) { + writeb(txp ? *txp++ : 0, hw->base + TINY_SPI_TXDATA); + + if (rxp || (i != t->len - 1)) tiny_spi_wait_txr(hw); - writeb(0, hw->base + TINY_SPI_TXDATA); - } + if (rxp) + *rxp++ = readb(hw->base + TINY_SPI_TXDATA); } tiny_spi_wait_txe(hw); + if (rxp) + *rxp++ = readb(hw->base + TINY_SPI_RXDATA); } + return t->len; } -- 2.7.4