diff options
author | Mark Brown <broonie@linaro.org> | 2013-10-05 11:51:14 +0100 |
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committer | Mark Brown <broonie@linaro.org> | 2013-10-11 20:10:17 +0100 |
commit | 0732a9d2a1551e3be5fd8a3ea680deb3d9e56193 (patch) | |
tree | 7438d037ad4a4000034c77844c479057cf30ce1e | |
parent | 2cc6e2e0c8157b9e6ed8dbe5c7284865f6afbd46 (diff) | |
download | op-kernel-dev-0732a9d2a1551e3be5fd8a3ea680deb3d9e56193.zip op-kernel-dev-0732a9d2a1551e3be5fd8a3ea680deb3d9e56193.tar.gz |
spi/s3c64xx: Use core message handling
Signed-off-by: Mark Brown <broonie@linaro.org>
-rw-r--r-- | drivers/spi/spi-s3c64xx.c | 152 |
1 files changed, 56 insertions, 96 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index c7b36c0..25eb352 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -879,121 +879,81 @@ static int s3c64xx_spi_prepare_message(struct spi_master *master, return 0; } -static int s3c64xx_spi_transfer_one_message(struct spi_master *master, - struct spi_message *msg) +static int s3c64xx_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) { struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); - struct spi_device *spi = msg->spi; - struct spi_transfer *xfer; - int status = 0, cs_toggle = 0; + int status; u32 speed; u8 bpw; + unsigned long flags; + int use_dma; - list_for_each_entry(xfer, &msg->transfers, transfer_list) { - - unsigned long flags; - int use_dma; - - INIT_COMPLETION(sdd->xfer_completion); - - /* Only BPW and Speed may change across transfers */ - bpw = xfer->bits_per_word; - speed = xfer->speed_hz ? : spi->max_speed_hz; - - if (xfer->len % (bpw / 8)) { - dev_err(&spi->dev, - "Xfer length(%u) not a multiple of word size(%u)\n", - xfer->len, bpw / 8); - status = -EIO; - goto out; - } - - if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) { - sdd->cur_bpw = bpw; - sdd->cur_speed = speed; - s3c64xx_spi_config(sdd); - } - - /* Slave Select */ - enable_cs(sdd, spi); - - /* Polling method for xfers not bigger than FIFO capacity */ - use_dma = 0; - if (!is_polling(sdd) && - (sdd->rx_dma.ch && sdd->tx_dma.ch && - (xfer->len > ((FIFO_LVL_MASK(sdd) >> 1) + 1)))) - use_dma = 1; - - spin_lock_irqsave(&sdd->lock, flags); + INIT_COMPLETION(sdd->xfer_completion); - /* Pending only which is to be done */ - sdd->state &= ~RXBUSY; - sdd->state &= ~TXBUSY; + /* Only BPW and Speed may change across transfers */ + bpw = xfer->bits_per_word; + speed = xfer->speed_hz ? : spi->max_speed_hz; - enable_datapath(sdd, spi, xfer, use_dma); - - /* Start the signals */ - writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL); + if (xfer->len % (bpw / 8)) { + dev_err(&spi->dev, + "Xfer length(%u) not a multiple of word size(%u)\n", + xfer->len, bpw / 8); + return -EIO; + } - /* Start the signals */ - writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL); + if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) { + sdd->cur_bpw = bpw; + sdd->cur_speed = speed; + s3c64xx_spi_config(sdd); + } - spin_unlock_irqrestore(&sdd->lock, flags); + /* Polling method for xfers not bigger than FIFO capacity */ + use_dma = 0; + if (!is_polling(sdd) && + (sdd->rx_dma.ch && sdd->tx_dma.ch && + (xfer->len > ((FIFO_LVL_MASK(sdd) >> 1) + 1)))) + use_dma = 1; - status = wait_for_xfer(sdd, xfer, use_dma); + spin_lock_irqsave(&sdd->lock, flags); - if (status) { - dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n", - xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0, - (sdd->state & RXBUSY) ? 'f' : 'p', - (sdd->state & TXBUSY) ? 'f' : 'p', - xfer->len); + /* Pending only which is to be done */ + sdd->state &= ~RXBUSY; + sdd->state &= ~TXBUSY; - if (use_dma) { - if (xfer->tx_buf != NULL - && (sdd->state & TXBUSY)) - s3c64xx_spi_dma_stop(sdd, &sdd->tx_dma); - if (xfer->rx_buf != NULL - && (sdd->state & RXBUSY)) - s3c64xx_spi_dma_stop(sdd, &sdd->rx_dma); - } + enable_datapath(sdd, spi, xfer, use_dma); - goto out; - } + /* Start the signals */ + writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL); - flush_fifo(sdd); + /* Start the signals */ + writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL); - if (xfer->delay_usecs) - udelay(xfer->delay_usecs); + spin_unlock_irqrestore(&sdd->lock, flags); - if (xfer->cs_change) { - /* Hint that the next mssg is gonna be - for the same device */ - if (list_is_last(&xfer->transfer_list, - &msg->transfers)) - cs_toggle = 1; + status = wait_for_xfer(sdd, xfer, use_dma); + + if (status) { + dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n", + xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0, + (sdd->state & RXBUSY) ? 'f' : 'p', + (sdd->state & TXBUSY) ? 'f' : 'p', + xfer->len); + + if (use_dma) { + if (xfer->tx_buf != NULL + && (sdd->state & TXBUSY)) + s3c64xx_spi_dma_stop(sdd, &sdd->tx_dma); + if (xfer->rx_buf != NULL + && (sdd->state & RXBUSY)) + s3c64xx_spi_dma_stop(sdd, &sdd->rx_dma); } - - msg->actual_length += xfer->len; - } - -out: - if (!cs_toggle || status) { - /* Quiese the signals */ - writel(S3C64XX_SPI_SLAVE_SIG_INACT, - sdd->regs + S3C64XX_SPI_SLAVE_SEL); - disable_cs(sdd, spi); } else { - sdd->tgl_spi = spi; + flush_fifo(sdd); } - s3c64xx_spi_unmap_mssg(sdd, msg); - - msg->status = status; - - spi_finalize_current_message(master); - - return 0; + return status; } static int s3c64xx_spi_unprepare_message(struct spi_master *master, @@ -1379,7 +1339,7 @@ static int s3c64xx_spi_probe(struct platform_device *pdev) master->cleanup = s3c64xx_spi_cleanup; master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer; master->prepare_message = s3c64xx_spi_prepare_message; - master->transfer_one_message = s3c64xx_spi_transfer_one_message; + master->transfer_one = s3c64xx_spi_transfer_one; master->unprepare_message = s3c64xx_spi_unprepare_message; master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer; master->num_chipselect = sci->num_cs; |