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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-01-09 14:50:19 +00:00
spi/s3c64xx: Use core message handling
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
parent
2cc6e2e0c8
commit
0732a9d2a1
@ -879,121 +879,81 @@ static int s3c64xx_spi_prepare_message(struct spi_master *master,
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return 0;
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}
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static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
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struct spi_message *msg)
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static int s3c64xx_spi_transfer_one(struct spi_master *master,
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struct spi_device *spi,
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struct spi_transfer *xfer)
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{
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struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
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struct spi_device *spi = msg->spi;
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struct spi_transfer *xfer;
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int status = 0, cs_toggle = 0;
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int status;
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u32 speed;
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u8 bpw;
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unsigned long flags;
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int use_dma;
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list_for_each_entry(xfer, &msg->transfers, transfer_list) {
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INIT_COMPLETION(sdd->xfer_completion);
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unsigned long flags;
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int use_dma;
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/* Only BPW and Speed may change across transfers */
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bpw = xfer->bits_per_word;
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speed = xfer->speed_hz ? : spi->max_speed_hz;
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INIT_COMPLETION(sdd->xfer_completion);
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/* Only BPW and Speed may change across transfers */
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bpw = xfer->bits_per_word;
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speed = xfer->speed_hz ? : spi->max_speed_hz;
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if (xfer->len % (bpw / 8)) {
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dev_err(&spi->dev,
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"Xfer length(%u) not a multiple of word size(%u)\n",
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xfer->len, bpw / 8);
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status = -EIO;
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goto out;
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}
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if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
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sdd->cur_bpw = bpw;
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sdd->cur_speed = speed;
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s3c64xx_spi_config(sdd);
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}
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/* Slave Select */
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enable_cs(sdd, spi);
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/* Polling method for xfers not bigger than FIFO capacity */
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use_dma = 0;
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if (!is_polling(sdd) &&
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(sdd->rx_dma.ch && sdd->tx_dma.ch &&
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(xfer->len > ((FIFO_LVL_MASK(sdd) >> 1) + 1))))
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use_dma = 1;
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spin_lock_irqsave(&sdd->lock, flags);
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/* Pending only which is to be done */
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sdd->state &= ~RXBUSY;
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sdd->state &= ~TXBUSY;
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enable_datapath(sdd, spi, xfer, use_dma);
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/* Start the signals */
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writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
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/* Start the signals */
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writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
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spin_unlock_irqrestore(&sdd->lock, flags);
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status = wait_for_xfer(sdd, xfer, use_dma);
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if (status) {
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dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
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xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
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(sdd->state & RXBUSY) ? 'f' : 'p',
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(sdd->state & TXBUSY) ? 'f' : 'p',
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xfer->len);
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if (use_dma) {
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if (xfer->tx_buf != NULL
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&& (sdd->state & TXBUSY))
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s3c64xx_spi_dma_stop(sdd, &sdd->tx_dma);
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if (xfer->rx_buf != NULL
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&& (sdd->state & RXBUSY))
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s3c64xx_spi_dma_stop(sdd, &sdd->rx_dma);
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}
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goto out;
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}
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flush_fifo(sdd);
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if (xfer->delay_usecs)
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udelay(xfer->delay_usecs);
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if (xfer->cs_change) {
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/* Hint that the next mssg is gonna be
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for the same device */
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if (list_is_last(&xfer->transfer_list,
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&msg->transfers))
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cs_toggle = 1;
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}
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msg->actual_length += xfer->len;
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if (xfer->len % (bpw / 8)) {
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dev_err(&spi->dev,
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"Xfer length(%u) not a multiple of word size(%u)\n",
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xfer->len, bpw / 8);
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return -EIO;
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}
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out:
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if (!cs_toggle || status) {
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/* Quiese the signals */
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writel(S3C64XX_SPI_SLAVE_SIG_INACT,
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sdd->regs + S3C64XX_SPI_SLAVE_SEL);
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disable_cs(sdd, spi);
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if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
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sdd->cur_bpw = bpw;
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sdd->cur_speed = speed;
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s3c64xx_spi_config(sdd);
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}
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/* Polling method for xfers not bigger than FIFO capacity */
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use_dma = 0;
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if (!is_polling(sdd) &&
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(sdd->rx_dma.ch && sdd->tx_dma.ch &&
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(xfer->len > ((FIFO_LVL_MASK(sdd) >> 1) + 1))))
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use_dma = 1;
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spin_lock_irqsave(&sdd->lock, flags);
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/* Pending only which is to be done */
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sdd->state &= ~RXBUSY;
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sdd->state &= ~TXBUSY;
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enable_datapath(sdd, spi, xfer, use_dma);
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/* Start the signals */
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writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
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/* Start the signals */
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writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
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spin_unlock_irqrestore(&sdd->lock, flags);
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status = wait_for_xfer(sdd, xfer, use_dma);
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if (status) {
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dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
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xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
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(sdd->state & RXBUSY) ? 'f' : 'p',
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(sdd->state & TXBUSY) ? 'f' : 'p',
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xfer->len);
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if (use_dma) {
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if (xfer->tx_buf != NULL
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&& (sdd->state & TXBUSY))
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s3c64xx_spi_dma_stop(sdd, &sdd->tx_dma);
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if (xfer->rx_buf != NULL
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&& (sdd->state & RXBUSY))
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s3c64xx_spi_dma_stop(sdd, &sdd->rx_dma);
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}
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} else {
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sdd->tgl_spi = spi;
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flush_fifo(sdd);
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}
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s3c64xx_spi_unmap_mssg(sdd, msg);
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msg->status = status;
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spi_finalize_current_message(master);
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return 0;
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return status;
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}
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static int s3c64xx_spi_unprepare_message(struct spi_master *master,
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@ -1379,7 +1339,7 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
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master->cleanup = s3c64xx_spi_cleanup;
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master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
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master->prepare_message = s3c64xx_spi_prepare_message;
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master->transfer_one_message = s3c64xx_spi_transfer_one_message;
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master->transfer_one = s3c64xx_spi_transfer_one;
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master->unprepare_message = s3c64xx_spi_unprepare_message;
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master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;
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master->num_chipselect = sci->num_cs;
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