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Date: Mon, 03 Sep 2012 19:35:54 +0530
From: Shubhrajyoti <shubhrajyoti@...com>
To: Shubhrajyoti D <shubhrajyoti@...com>
CC: spi-devel-general@...ts.sourceforge.net,
linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: omap2-mcspi: Cleanup the omap2_mcspi_txrx_dma function
On Monday 03 September 2012 07:32 PM, Shubhrajyoti D wrote:
> Currently in omap2_mcspi_txrx_dma has the rx
I meant tx here will resend. please ignore this patch
> and the rx support
> interleaved. Make the rx related code in omap2_mcspi_rx_dma
> and the tx related code omap2_mcspi_tx_dma and call functions.
>
> While at it also remove the braces in the if statements which has only
> one line.
> Also fix ["foo * bar" to "foo *bar"] warn for the rx and tx variables.
>
> Only a cleanup no functional change.
>
> Signed-off-by: Shubhrajyoti D <shubhrajyoti@...com>
> ---
> drivers/spi/spi-omap2-mcspi.c | 256 +++++++++++++++++++++++------------------
> 1 files changed, 144 insertions(+), 112 deletions(-)
>
> diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
> index 1c1dd34..dd8fc88 100644
> --- a/drivers/spi/spi-omap2-mcspi.c
> +++ b/drivers/spi/spi-omap2-mcspi.c
> @@ -315,49 +315,27 @@ static void omap2_mcspi_tx_callback(void *data)
> omap2_mcspi_set_dma_req(spi, 0, 0);
> }
>
> -static unsigned
> -omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
> +static void omap2_mcspi_tx_dma(struct spi_device *spi,
> + struct spi_transfer *xfer,
> + struct dma_slave_config cfg)
> {
> struct omap2_mcspi *mcspi;
> - struct omap2_mcspi_cs *cs = spi->controller_state;
> struct omap2_mcspi_dma *mcspi_dma;
> unsigned int count;
> - int word_len, element_count;
> - int elements = 0;
> - u32 l;
> u8 * rx;
> const u8 * tx;
> void __iomem *chstat_reg;
> - struct dma_slave_config cfg;
> - enum dma_slave_buswidth width;
> - unsigned es;
> + struct omap2_mcspi_cs *cs = spi->controller_state;
>
> mcspi = spi_master_get_devdata(spi->master);
> mcspi_dma = &mcspi->dma_channels[spi->chip_select];
> - l = mcspi_cached_chconf0(spi);
> + count = xfer->len;
>
> + rx = xfer->rx_buf;
> + tx = xfer->tx_buf;
> chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0;
>
> - if (cs->word_len <= 8) {
> - width = DMA_SLAVE_BUSWIDTH_1_BYTE;
> - es = 1;
> - } else if (cs->word_len <= 16) {
> - width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> - es = 2;
> - } else {
> - width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> - es = 4;
> - }
> -
> - memset(&cfg, 0, sizeof(cfg));
> - cfg.src_addr = cs->phys + OMAP2_MCSPI_RX0;
> - cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0;
> - cfg.src_addr_width = width;
> - cfg.dst_addr_width = width;
> - cfg.src_maxburst = 1;
> - cfg.dst_maxburst = 1;
> -
> - if (xfer->tx_buf && mcspi_dma->dma_tx) {
> + if (mcspi_dma->dma_tx) {
> struct dma_async_tx_descriptor *tx;
> struct scatterlist sg;
>
> @@ -368,7 +346,7 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
> sg_dma_len(&sg) = xfer->len;
>
> tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, &sg, 1,
> - DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
> + DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
> if (tx) {
> tx->callback = omap2_mcspi_tx_callback;
> tx->callback_param = spi;
> @@ -377,8 +355,50 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
> /* FIXME: fall back to PIO? */
> }
> }
> + dma_async_issue_pending(mcspi_dma->dma_tx);
> + omap2_mcspi_set_dma_req(spi, 0, 1);
>
> - if (xfer->rx_buf && mcspi_dma->dma_rx) {
> + wait_for_completion(&mcspi_dma->dma_tx_completion);
> + dma_unmap_single(mcspi->dev, xfer->tx_dma, count,
> + DMA_TO_DEVICE);
> +
> + /* for TX_ONLY mode, be sure all words have shifted out */
> + if (rx == NULL) {
> + if (mcspi_wait_for_reg_bit(chstat_reg,
> + OMAP2_MCSPI_CHSTAT_TXS) < 0)
> + dev_err(&spi->dev, "TXS timed out\n");
> + else if (mcspi_wait_for_reg_bit(chstat_reg,
> + OMAP2_MCSPI_CHSTAT_EOT) < 0)
> + dev_err(&spi->dev, "EOT timed out\n");
> + }
> +}
> +
> +static unsigned
> +omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
> + struct dma_slave_config cfg,
> + unsigned es)
> +{
> + struct omap2_mcspi *mcspi;
> + struct omap2_mcspi_dma *mcspi_dma;
> + unsigned int count;
> + u32 l;
> + int elements = 0;
> + int word_len, element_count;
> + struct omap2_mcspi_cs *cs = spi->controller_state;
> + mcspi = spi_master_get_devdata(spi->master);
> + mcspi_dma = &mcspi->dma_channels[spi->chip_select];
> + count = xfer->len;
> + word_len = cs->word_len;
> + l = mcspi_cached_chconf0(spi);
> +
> + if (word_len <= 8)
> + element_count = count;
> + else if (word_len <= 16)
> + element_count = count >> 1;
> + else /* word_len <= 32 */
> + element_count = count >> 2;
> +
> + if (mcspi_dma->dma_rx) {
> struct dma_async_tx_descriptor *tx;
> struct scatterlist sg;
> size_t len = xfer->len - es;
> @@ -393,108 +413,120 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
> sg_dma_len(&sg) = len;
>
> tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, &sg, 1,
> - DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
> + DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT |
> + DMA_CTRL_ACK);
> if (tx) {
> tx->callback = omap2_mcspi_rx_callback;
> tx->callback_param = spi;
> dmaengine_submit(tx);
> } else {
> - /* FIXME: fall back to PIO? */
> - }
> - }
> -
> - count = xfer->len;
> - word_len = cs->word_len;
> -
> - rx = xfer->rx_buf;
> - tx = xfer->tx_buf;
> -
> - if (word_len <= 8) {
> - element_count = count;
> - } else if (word_len <= 16) {
> - element_count = count >> 1;
> - } else /* word_len <= 32 */ {
> - element_count = count >> 2;
> - }
> -
> - if (tx != NULL) {
> - dma_async_issue_pending(mcspi_dma->dma_tx);
> - omap2_mcspi_set_dma_req(spi, 0, 1);
> - }
> -
> - if (rx != NULL) {
> - dma_async_issue_pending(mcspi_dma->dma_rx);
> - omap2_mcspi_set_dma_req(spi, 1, 1);
> - }
> -
> - if (tx != NULL) {
> - wait_for_completion(&mcspi_dma->dma_tx_completion);
> - dma_unmap_single(mcspi->dev, xfer->tx_dma, count,
> - DMA_TO_DEVICE);
> -
> - /* for TX_ONLY mode, be sure all words have shifted out */
> - if (rx == NULL) {
> - if (mcspi_wait_for_reg_bit(chstat_reg,
> - OMAP2_MCSPI_CHSTAT_TXS) < 0)
> - dev_err(&spi->dev, "TXS timed out\n");
> - else if (mcspi_wait_for_reg_bit(chstat_reg,
> - OMAP2_MCSPI_CHSTAT_EOT) < 0)
> - dev_err(&spi->dev, "EOT timed out\n");
> + /* FIXME: fall back to PIO? */
> }
> }
>
> - if (rx != NULL) {
> - wait_for_completion(&mcspi_dma->dma_rx_completion);
> - dma_unmap_single(mcspi->dev, xfer->rx_dma, count,
> - DMA_FROM_DEVICE);
> - omap2_mcspi_set_enable(spi, 0);
> + dma_async_issue_pending(mcspi_dma->dma_rx);
> + omap2_mcspi_set_dma_req(spi, 1, 1);
>
> - elements = element_count - 1;
> + wait_for_completion(&mcspi_dma->dma_rx_completion);
> + dma_unmap_single(mcspi->dev, xfer->rx_dma, count,
> + DMA_FROM_DEVICE);
> + omap2_mcspi_set_enable(spi, 0);
>
> - if (l & OMAP2_MCSPI_CHCONF_TURBO) {
> - elements--;
> + elements = element_count - 1;
>
> - if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
> - & OMAP2_MCSPI_CHSTAT_RXS)) {
> - u32 w;
> -
> - w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
> - if (word_len <= 8)
> - ((u8 *)xfer->rx_buf)[elements++] = w;
> - else if (word_len <= 16)
> - ((u16 *)xfer->rx_buf)[elements++] = w;
> - else /* word_len <= 32 */
> - ((u32 *)xfer->rx_buf)[elements++] = w;
> - } else {
> - dev_err(&spi->dev,
> - "DMA RX penultimate word empty");
> - count -= (word_len <= 8) ? 2 :
> - (word_len <= 16) ? 4 :
> - /* word_len <= 32 */ 8;
> - omap2_mcspi_set_enable(spi, 1);
> - return count;
> - }
> - }
> + if (l & OMAP2_MCSPI_CHCONF_TURBO) {
> + elements--;
>
> if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
> - & OMAP2_MCSPI_CHSTAT_RXS)) {
> + & OMAP2_MCSPI_CHSTAT_RXS)) {
> u32 w;
>
> w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
> if (word_len <= 8)
> - ((u8 *)xfer->rx_buf)[elements] = w;
> + ((u8 *)xfer->rx_buf)[elements++] = w;
> else if (word_len <= 16)
> - ((u16 *)xfer->rx_buf)[elements] = w;
> + ((u16 *)xfer->rx_buf)[elements++] = w;
> else /* word_len <= 32 */
> - ((u32 *)xfer->rx_buf)[elements] = w;
> + ((u32 *)xfer->rx_buf)[elements++] = w;
> } else {
> - dev_err(&spi->dev, "DMA RX last word empty");
> - count -= (word_len <= 8) ? 1 :
> - (word_len <= 16) ? 2 :
> - /* word_len <= 32 */ 4;
> + dev_err(&spi->dev, "DMA RX penultimate word empty");
> + count -= (word_len <= 8) ? 2 :
> + (word_len <= 16) ? 4 :
> + /* word_len <= 32 */ 8;
> + omap2_mcspi_set_enable(spi, 1);
> + return count;
> }
> - omap2_mcspi_set_enable(spi, 1);
> }
> + if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
> + & OMAP2_MCSPI_CHSTAT_RXS)) {
> + u32 w;
> +
> + w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
> + if (word_len <= 8)
> + ((u8 *)xfer->rx_buf)[elements] = w;
> + else if (word_len <= 16)
> + ((u16 *)xfer->rx_buf)[elements] = w;
> + else /* word_len <= 32 */
> + ((u32 *)xfer->rx_buf)[elements] = w;
> + } else {
> + dev_err(&spi->dev, "DMA RX last word empty");
> + count -= (word_len <= 8) ? 1 :
> + (word_len <= 16) ? 2 :
> + /* word_len <= 32 */ 4;
> + }
> + omap2_mcspi_set_enable(spi, 1);
> + return count;
> +}
> +
> +static unsigned
> +omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
> +{
> + struct omap2_mcspi *mcspi;
> + struct omap2_mcspi_cs *cs = spi->controller_state;
> + struct omap2_mcspi_dma *mcspi_dma;
> + unsigned int count;
> + u32 l;
> + u8 *rx;
> + const u8 *tx;
> + struct dma_slave_config cfg;
> + enum dma_slave_buswidth width;
> + unsigned es;
> +
> + mcspi = spi_master_get_devdata(spi->master);
> + mcspi_dma = &mcspi->dma_channels[spi->chip_select];
> + l = mcspi_cached_chconf0(spi);
> +
> +
> + if (cs->word_len <= 8) {
> + width = DMA_SLAVE_BUSWIDTH_1_BYTE;
> + es = 1;
> + } else if (cs->word_len <= 16) {
> + width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> + es = 2;
> + } else {
> + width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> + es = 4;
> + }
> +
> + memset(&cfg, 0, sizeof(cfg));
> + cfg.src_addr = cs->phys + OMAP2_MCSPI_RX0;
> + cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0;
> + cfg.src_addr_width = width;
> + cfg.dst_addr_width = width;
> + cfg.src_maxburst = 1;
> + cfg.dst_maxburst = 1;
> +
> + rx = xfer->rx_buf;
> + tx = xfer->tx_buf;
> +
> + count = xfer->len;
> +
> + if (tx != NULL)
> + omap2_mcspi_tx_dma(spi, xfer, cfg);
> +
> + if (rx != NULL)
> + return omap2_mcspi_rx_dma(spi, xfer, cfg, es);
> +
> return count;
> }
>
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