From: Brian Niebuhr <[email protected]> Use the fact that the get_tx and get_rx can now cope with NULL buffer pointers to simplify the poll mode transfer code.
While at it, check for SPI errors every transfer rather than at the end of the whole transfer. Signed-off-by: Brian Niebuhr <[email protected]> Tested-By: Michael Williamson <[email protected]> Signed-off-by: Sekhar Nori <[email protected]> --- drivers/spi/davinci_spi.c | 96 +++++++++++++++++++-------------------------- 1 files changed, 41 insertions(+), 55 deletions(-) diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c index 198f062..cd37697 100644 --- a/drivers/spi/davinci_spi.c +++ b/drivers/spi/davinci_spi.c @@ -91,6 +91,10 @@ #define SPIFLG_BITERR_MASK BIT(4) #define SPIFLG_OVRRUN_MASK BIT(6) #define SPIFLG_BUF_INIT_ACTIVE_MASK BIT(24) +#define SPIFLG_ERROR_MASK (SPIFLG_DLEN_ERR_MASK \ + | SPIFLG_TIMEOUT_MASK | SPIFLG_PARERR_MASK \ + | SPIFLG_DESYNC_MASK | SPIFLG_BITERR_MASK \ + | SPIFLG_OVRRUN_MASK) #define SPIINT_DMA_REQ_EN BIT(16) @@ -601,10 +605,10 @@ static int davinci_spi_check_error(struct davinci_spi *davinci_spi, static int davinci_spi_bufs_pio(struct spi_device *spi, struct spi_transfer *t) { struct davinci_spi *davinci_spi; - int status, count, ret; - u8 conv; + int ret; + int rcount, wcount; u32 tx_data, data1_reg_val; - u32 buf_val, flg_val; + u32 errors = 0; struct davinci_spi_platform_data *pdata; davinci_spi = spi_master_get_devdata(spi->master); @@ -612,70 +616,51 @@ static int davinci_spi_bufs_pio(struct spi_device *spi, struct spi_transfer *t) davinci_spi->tx = t->tx_buf; davinci_spi->rx = t->rx_buf; - - /* convert len to words based on bits_per_word */ - conv = davinci_spi->bytes_per_word[spi->chip_select]; - data1_reg_val = ioread32(davinci_spi->base + SPIDAT1); + wcount = t->len / davinci_spi->bytes_per_word[spi->chip_select]; + rcount = wcount; ret = davinci_spi_bufs_prep(spi, davinci_spi); if (ret) return ret; + data1_reg_val = ioread32(davinci_spi->base + SPIDAT1); + /* Enable SPI */ set_io_bits(davinci_spi->base + SPIGCR1, SPIGCR1_SPIENA_MASK); - count = t->len / conv; - clear_io_bits(davinci_spi->base + SPIINT, SPIINT_MASKALL); - /* Determine the command to execute READ or WRITE */ - if (t->tx_buf) { + /* start the transfer */ + wcount--; + tx_data = davinci_spi->get_tx(davinci_spi); + data1_reg_val &= 0xFFFF0000; + data1_reg_val |= tx_data & 0xFFFF; + iowrite32(data1_reg_val, davinci_spi->base + SPIDAT1); - while (1) { - tx_data = davinci_spi->get_tx(davinci_spi); + while (rcount > 0 || wcount > 0) { - data1_reg_val &= ~(0xFFFF); - data1_reg_val |= (0xFFFF & tx_data); - - buf_val = ioread32(davinci_spi->base + SPIBUF); - if ((buf_val & SPIBUF_TXFULL_MASK) == 0) { - iowrite32(data1_reg_val, - davinci_spi->base + SPIDAT1); - - count--; - } - while (ioread32(davinci_spi->base + SPIBUF) - & SPIBUF_RXEMPTY_MASK) - cpu_relax(); - - /* getting the returned byte */ - if (t->rx_buf) { - buf_val = ioread32(davinci_spi->base + SPIBUF); - davinci_spi->get_rx(buf_val, davinci_spi); - } - if (count <= 0) - break; - } - } else { - while (1) { - /* keeps the serial clock going */ - if ((ioread32(davinci_spi->base + SPIBUF) - & SPIBUF_TXFULL_MASK) == 0) - iowrite32(data1_reg_val, - davinci_spi->base + SPIDAT1); + u32 buf, status; - while (ioread32(davinci_spi->base + SPIBUF) & - SPIBUF_RXEMPTY_MASK) - cpu_relax(); + buf = ioread32(davinci_spi->base + SPIBUF); - flg_val = ioread32(davinci_spi->base + SPIFLG); - buf_val = ioread32(davinci_spi->base + SPIBUF); + if (!(buf & SPIBUF_RXEMPTY_MASK)) { + davinci_spi->get_rx(buf & 0xFFFF, davinci_spi); + rcount--; + } - davinci_spi->get_rx(buf_val, davinci_spi); + status = ioread32(davinci_spi->base + SPIFLG); - count--; - if (count <= 0) - break; + if (unlikely(status & SPIFLG_ERROR_MASK)) { + errors = status & SPIFLG_ERROR_MASK; + break; + } + + if (wcount > 0 && !(buf & SPIBUF_TXFULL_MASK)) { + wcount--; + tx_data = davinci_spi->get_tx(davinci_spi); + data1_reg_val &= ~0xFFFF; + data1_reg_val |= 0xFFFF & tx_data; + iowrite32(data1_reg_val, davinci_spi->base + SPIDAT1); } } @@ -683,11 +668,12 @@ static int davinci_spi_bufs_pio(struct spi_device *spi, struct spi_transfer *t) * Check for bit error, desync error,parity error,timeout error and * receive overflow errors */ - status = ioread32(davinci_spi->base + SPIFLG); - - ret = davinci_spi_check_error(davinci_spi, status); - if (ret != 0) + if (errors) { + ret = davinci_spi_check_error(davinci_spi, errors); + WARN(!ret, "%s: error reported but no error found!\n", + dev_name(&spi->dev)); return ret; + } return t->len; } -- 1.7.3.2 ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today http://p.sf.net/sfu/msIE9-sfdev2dev _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
