diff options
Diffstat (limited to 'drivers/spi/spi-fsl-spi.c')
| -rw-r--r-- | drivers/spi/spi-fsl-spi.c | 51 |
1 files changed, 31 insertions, 20 deletions
diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c index 1569f7defc73..aba00fd0791f 100644 --- a/drivers/spi/spi-fsl-spi.c +++ b/drivers/spi/spi-fsl-spi.c @@ -91,6 +91,25 @@ static void fsl_spi_chipselect(struct spi_device *spi, int value) } } +static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift, + int bits_per_word, int msb_first) +{ + *rx_shift = 0; + *tx_shift = 0; + if (msb_first) { + if (bits_per_word <= 8) { + *rx_shift = 16; + *tx_shift = 24; + } else if (bits_per_word <= 16) { + *rx_shift = 16; + *tx_shift = 16; + } + } else { + if (bits_per_word <= 8) + *rx_shift = 8; + } +} + static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs, struct spi_device *spi, struct mpc8xxx_spi *mpc8xxx_spi, @@ -101,31 +120,20 @@ static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs, if (bits_per_word <= 8) { cs->get_rx = mpc8xxx_spi_rx_buf_u8; cs->get_tx = mpc8xxx_spi_tx_buf_u8; - if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { - cs->rx_shift = 16; - cs->tx_shift = 24; - } } else if (bits_per_word <= 16) { cs->get_rx = mpc8xxx_spi_rx_buf_u16; cs->get_tx = mpc8xxx_spi_tx_buf_u16; - if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { - cs->rx_shift = 16; - cs->tx_shift = 16; - } } else if (bits_per_word <= 32) { cs->get_rx = mpc8xxx_spi_rx_buf_u32; cs->get_tx = mpc8xxx_spi_tx_buf_u32; } else return -EINVAL; - if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE && - spi->mode & SPI_LSB_FIRST) { - cs->tx_shift = 0; - if (bits_per_word <= 8) - cs->rx_shift = 8; - else - cs->rx_shift = 0; - } + if (mpc8xxx_spi->set_shifts) + mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift, + bits_per_word, + !(spi->mode & SPI_LSB_FIRST)); + mpc8xxx_spi->rx_shift = cs->rx_shift; mpc8xxx_spi->tx_shift = cs->tx_shift; mpc8xxx_spi->get_rx = cs->get_rx; @@ -487,10 +495,13 @@ static struct spi_master * fsl_spi_probe(struct device *dev, if (ret) goto err_cpm_init; - if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { - mpc8xxx_spi->rx_shift = 16; - mpc8xxx_spi->tx_shift = 24; - } + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) + mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts; + + if (mpc8xxx_spi->set_shifts) + /* 8 bits per word and MSB first */ + mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift, + &mpc8xxx_spi->tx_shift, 8, 1); mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem)); if (mpc8xxx_spi->reg_base == NULL) { |