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authorAndreas Larsson <andreas@gaisler.com>2013-02-15 19:52:25 +0400
committerGrant Likely <grant.likely@secretlab.ca>2013-04-07 13:07:56 +0400
commit8922a366ddd20964e3542e12f0315a8a88b3a638 (patch)
treef002ba035438fe7586259f24c757b99cff0d6e92 /drivers/spi
parentc3f3e7717f1cf01d9117a98ed89decc41d7cb5db (diff)
downloadlinux-8922a366ddd20964e3542e12f0315a8a88b3a638.tar.xz
spi/spi-fsl-spi: Add support for setting a maximum number of bits per word
Acked-by: Anton Vorontsov <anton@enomsg.org> Signed-off-by: Andreas Larsson <andreas@gaisler.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-fsl-lib.h1
-rw-r--r--drivers/spi/spi-fsl-spi.c8
2 files changed, 8 insertions, 1 deletions
diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index 5a9c36c7cb68..d5c788b584df 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h
@@ -71,6 +71,7 @@ struct mpc8xxx_spi {
#ifdef CONFIG_SPI_FSL_SPI
int type;
+ u8 max_bits_per_word;
void (*set_shifts)(u32 *rx_shift, u32 *tx_shift,
int bits_per_word, int msb_first);
diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index b9064434e0f7..7eff63a284ff 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -213,7 +213,8 @@ static int fsl_spi_setup_transfer(struct spi_device *spi,
/* Make sure its a bit width we support [4..16, 32] */
if ((bits_per_word < 4)
- || ((bits_per_word > 16) && (bits_per_word != 32)))
+ || ((bits_per_word > 16) && (bits_per_word != 32))
+ || (bits_per_word > mpc8xxx_spi->max_bits_per_word))
return -EINVAL;
if (!hz)
@@ -520,6 +521,7 @@ static struct spi_master * fsl_spi_probe(struct device *dev,
mpc8xxx_spi = spi_master_get_devdata(master);
mpc8xxx_spi->spi_do_one_msg = fsl_spi_do_one_msg;
mpc8xxx_spi->spi_remove = fsl_spi_remove;
+ mpc8xxx_spi->max_bits_per_word = 32;
mpc8xxx_spi->type = fsl_spi_get_type(dev);
ret = fsl_spi_cpm_init(mpc8xxx_spi);
@@ -557,6 +559,10 @@ static struct spi_master * fsl_spi_probe(struct device *dev,
/* Enable SPI interface */
regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
+ if (mpc8xxx_spi->max_bits_per_word < 8) {
+ regval &= ~SPMODE_LEN(0xF);
+ regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1);
+ }
if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
regval |= SPMODE_OP;