diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-bcm2835aux.c | 57 |
1 files changed, 41 insertions, 16 deletions
diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c index e1b2fec..a6e25c6 100644 --- a/drivers/spi/spi-bcm2835aux.c +++ b/drivers/spi/spi-bcm2835aux.c @@ -218,9 +218,9 @@ static irqreturn_t bcm2835aux_spi_interrupt(int irq, void *dev_id) BCM2835_AUX_SPI_CNTL1_IDLE); } - /* and if rx_len is 0 then wake up completion and disable spi */ + /* and if rx_len is 0 then disable interrupts and wake up completion */ if (!bs->rx_len) { - bcm2835aux_spi_reset_hw(bs); + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]); complete(&master->xfer_completion); } @@ -313,9 +313,6 @@ static int bcm2835aux_spi_transfer_one_poll(struct spi_master *master, } } - /* Transfer complete - reset SPI HW */ - bcm2835aux_spi_reset_hw(bs); - /* and return without waiting for completion */ return 0; } @@ -336,10 +333,6 @@ static int bcm2835aux_spi_transfer_one(struct spi_master *master, * resulting (potentially) in more interrupts when transferring * more than 12 bytes */ - bs->cntl[0] = BCM2835_AUX_SPI_CNTL0_ENABLE | - BCM2835_AUX_SPI_CNTL0_VAR_WIDTH | - BCM2835_AUX_SPI_CNTL0_MSBF_OUT; - bs->cntl[1] = BCM2835_AUX_SPI_CNTL1_MSBF_IN; /* set clock */ spi_hz = tfr->speed_hz; @@ -354,17 +347,13 @@ static int bcm2835aux_spi_transfer_one(struct spi_master *master, } else { /* the slowest we can go */ speed = BCM2835_AUX_SPI_CNTL0_SPEED_MAX; } + /* mask out old speed from previous spi_transfer */ + bs->cntl[0] &= ~(BCM2835_AUX_SPI_CNTL0_SPEED); + /* set the new speed */ bs->cntl[0] |= speed << BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT; spi_used_hz = clk_hz / (2 * (speed + 1)); - /* handle all the modes */ - if (spi->mode & SPI_CPOL) - bs->cntl[0] |= BCM2835_AUX_SPI_CNTL0_CPOL; - if (spi->mode & SPI_CPHA) - bs->cntl[0] |= BCM2835_AUX_SPI_CNTL0_CPHA_OUT | - BCM2835_AUX_SPI_CNTL0_CPHA_IN; - /* set transmit buffers and length */ bs->tx_buf = tfr->tx_buf; bs->rx_buf = tfr->rx_buf; @@ -388,6 +377,40 @@ static int bcm2835aux_spi_transfer_one(struct spi_master *master, return bcm2835aux_spi_transfer_one_irq(master, spi, tfr); } +static int bcm2835aux_spi_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct spi_device *spi = msg->spi; + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + + bs->cntl[0] = BCM2835_AUX_SPI_CNTL0_ENABLE | + BCM2835_AUX_SPI_CNTL0_VAR_WIDTH | + BCM2835_AUX_SPI_CNTL0_MSBF_OUT; + bs->cntl[1] = BCM2835_AUX_SPI_CNTL1_MSBF_IN; + + /* handle all the modes */ + if (spi->mode & SPI_CPOL) + bs->cntl[0] |= BCM2835_AUX_SPI_CNTL0_CPOL; + if (spi->mode & SPI_CPHA) + bs->cntl[0] |= BCM2835_AUX_SPI_CNTL0_CPHA_OUT | + BCM2835_AUX_SPI_CNTL0_CPHA_IN; + + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]); + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0, bs->cntl[0]); + + return 0; +} + +static int bcm2835aux_spi_unprepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + + bcm2835aux_spi_reset_hw(bs); + + return 0; +} + static void bcm2835aux_spi_handle_err(struct spi_master *master, struct spi_message *msg) { @@ -416,6 +439,8 @@ static int bcm2835aux_spi_probe(struct platform_device *pdev) master->num_chipselect = -1; master->transfer_one = bcm2835aux_spi_transfer_one; master->handle_err = bcm2835aux_spi_handle_err; + master->prepare_message = bcm2835aux_spi_prepare_message; + master->unprepare_message = bcm2835aux_spi_unprepare_message; master->dev.of_node = pdev->dev.of_node; bs = spi_master_get_devdata(master); |
