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| author | Marek Vasut <marex@denx.de> | 2013-08-26 17:45:23 +0200 |
|---|---|---|
| committer | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2013-08-27 19:39:39 +0530 |
| commit | a928a36ff91ba585310491f2d8c08ec2d30bc2b0 (patch) | |
| tree | c8e46d7db9d68165341974287f50cab039394fca /drivers/spi | |
| parent | 2b26201a2aef0b310b7c04702b0dba5dea493f77 (diff) | |
| download | u-boot-a928a36ff91ba585310491f2d8c08ec2d30bc2b0.zip u-boot-a928a36ff91ba585310491f2d8c08ec2d30bc2b0.tar.gz u-boot-a928a36ff91ba585310491f2d8c08ec2d30bc2b0.tar.bz2 | |
spi: mxs_spi: Configure chipselect after block reset
The chipselect must be written into the CTRL0 register after the SSP
block is reset, otherwise the block will always use ChipSelect #0.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/mxs_spi.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/drivers/spi/mxs_spi.c b/drivers/spi/mxs_spi.c index 3cf7142..2b9f395 100644 --- a/drivers/spi/mxs_spi.c +++ b/drivers/spi/mxs_spi.c @@ -56,8 +56,6 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, unsigned int max_hz, unsigned int mode) { struct mxs_spi_slave *mxs_slave; - struct mxs_ssp_regs *ssp_regs; - int reg; if (!spi_cs_is_valid(bus, cs)) { printf("mxs_spi: invalid bus %d / chip select %d\n", bus, cs); @@ -74,13 +72,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, mxs_slave->max_khz = max_hz / 1000; mxs_slave->mode = mode; mxs_slave->regs = mxs_ssp_regs_by_bus(bus); - ssp_regs = mxs_slave->regs; - reg = readl(&ssp_regs->hw_ssp_ctrl0); - reg &= ~(MXS_SSP_CHIPSELECT_MASK); - reg |= cs << MXS_SSP_CHIPSELECT_SHIFT; - - writel(reg, &ssp_regs->hw_ssp_ctrl0); return &mxs_slave->slave; err_init: @@ -102,7 +94,9 @@ int spi_claim_bus(struct spi_slave *slave) mxs_reset_block(&ssp_regs->hw_ssp_ctrl0_reg); - writel(SSP_CTRL0_BUS_WIDTH_ONE_BIT, &ssp_regs->hw_ssp_ctrl0); + writel((slave->cs << MXS_SSP_CHIPSELECT_SHIFT) | + SSP_CTRL0_BUS_WIDTH_ONE_BIT, + &ssp_regs->hw_ssp_ctrl0); reg = SSP_CTRL1_SSP_MODE_SPI | SSP_CTRL1_WORD_LENGTH_EIGHT_BITS; reg |= (mxs_slave->mode & SPI_CPOL) ? SSP_CTRL1_POLARITY : 0; |