diff options
Diffstat (limited to 'drivers/spi/davinci_spi.c')
| -rw-r--r-- | drivers/spi/davinci_spi.c | 64 |
1 files changed, 21 insertions, 43 deletions
diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c index 6f279c5d8f94..05b6145da3ef 100644 --- a/drivers/spi/davinci_spi.c +++ b/drivers/spi/davinci_spi.c @@ -482,13 +482,33 @@ static int davinci_spi_setup(struct spi_device *spi) int retval; struct davinci_spi *davinci_spi; struct davinci_spi_dma *davinci_spi_dma; + struct davinci_spi_platform_data *pdata; davinci_spi = spi_master_get_devdata(spi->master); + pdata = davinci_spi->pdata; /* if bits per word length is zero then set it default 8 */ if (!spi->bits_per_word) spi->bits_per_word = 8; + if (!(spi->mode & SPI_NO_CS)) { + if ((pdata->chip_sel == NULL) || + (pdata->chip_sel[spi->chip_select] == SPI_INTERN_CS)) + set_io_bits(davinci_spi->base + SPIPC0, + 1 << spi->chip_select); + + } + + if (spi->mode & SPI_READY) + set_io_bits(davinci_spi->base + SPIPC0, SPIPC0_SPIENA_MASK); + + if (spi->mode & SPI_LOOP) + set_io_bits(davinci_spi->base + SPIGCR1, + SPIGCR1_LOOPBACK_MASK); + else + clear_io_bits(davinci_spi->base + SPIGCR1, + SPIGCR1_LOOPBACK_MASK); + if (use_dma && davinci_spi->dma_channels) { davinci_spi_dma = &davinci_spi->dma_channels[spi->chip_select]; @@ -523,40 +543,6 @@ static void davinci_spi_cleanup(struct spi_device *spi) } } -static int davinci_spi_bufs_prep(struct spi_device *spi, - struct davinci_spi *davinci_spi) -{ - struct davinci_spi_platform_data *pdata; - int op_mode = 0; - - /* - * REVISIT unless devices disagree about SPI_LOOP or - * SPI_READY (SPI_NO_CS only allows one device!), this - * should not need to be done before each message... - * optimize for both flags staying cleared. - */ - - if (!(spi->mode & SPI_NO_CS)) { - pdata = davinci_spi->pdata; - if (!pdata->chip_sel || - pdata->chip_sel[spi->chip_select] == SPI_INTERN_CS) - op_mode |= 1 << spi->chip_select; - } - if (spi->mode & SPI_READY) - op_mode |= SPIPC0_SPIENA_MASK; - - iowrite32(op_mode, davinci_spi->base + SPIPC0); - - if (spi->mode & SPI_LOOP) - set_io_bits(davinci_spi->base + SPIGCR1, - SPIGCR1_LOOPBACK_MASK); - else - clear_io_bits(davinci_spi->base + SPIGCR1, - SPIGCR1_LOOPBACK_MASK); - - return 0; -} - static int davinci_spi_check_error(struct davinci_spi *davinci_spi, int int_status) { @@ -664,10 +650,6 @@ static int davinci_spi_bufs_pio(struct spi_device *spi, struct spi_transfer *t) davinci_spi->bytes_per_word[spi->chip_select]; davinci_spi->rcount = davinci_spi->wcount; - ret = davinci_spi_bufs_prep(spi, davinci_spi); - if (ret) - return ret; - data1_reg_val = ioread32(davinci_spi->base + SPIDAT1); /* Enable SPI */ @@ -769,10 +751,6 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t) init_completion(&davinci_spi_dma->dma_rx_completion); init_completion(&davinci_spi_dma->dma_tx_completion); - ret = davinci_spi_bufs_prep(spi, davinci_spi); - if (ret) - return ret; - count = t->len / data_type; /* the number of elements */ /* disable all interrupts for dma transfers */ @@ -1026,7 +1004,7 @@ static int davinci_spi_probe(struct platform_device *pdev) udelay(100); iowrite32(1, davinci_spi->base + SPIGCR0); - /* Set up SPIPC0. CS and ENA init is done in davinci_spi_bufs_prep */ + /* Set up SPIPC0. CS and ENA init is done in davinci_spi_setup */ spipc0 = SPIPC0_DIFUN_MASK | SPIPC0_DOFUN_MASK | SPIPC0_CLKFUN_MASK; iowrite32(spipc0, davinci_spi->base + SPIPC0); |