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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2015-08-31 16:55:52 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2015-08-31 17:12:28 +0200 |
| commit | cd4df8f82b77e2599a65b81cfa06f3bc58399e15 (patch) | |
| tree | 0f61c94c195d173d757d9b354863ce76f94cd1e5 /drivers/spi | |
| parent | 311f02fbe4f00cafbb365ef76b8ad2231a2934cd (diff) | |
| download | barebox-cd4df8f82b77e2599a65b81cfa06f3bc58399e15.tar.gz barebox-cd4df8f82b77e2599a65b81cfa06f3bc58399e15.tar.xz | |
spi: i.MX: use start mode control bit
The i.MX SPI controller in version 2.3 can immediately start a transfer
when the txfifo is written to. In this mode we no longer have to trigger
the transfer with the xch bit which makes the code a bit simpler.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/imx_spi.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/drivers/spi/imx_spi.c b/drivers/spi/imx_spi.c index 6805d22a75..81fa3b02ab 100644 --- a/drivers/spi/imx_spi.c +++ b/drivers/spi/imx_spi.c @@ -230,14 +230,8 @@ static unsigned int cspi_2_3_xchg_single(struct imx_spi *imx, unsigned int data) { void __iomem *base = imx->regs; - unsigned int cfg_reg = readl(base + CSPI_2_3_CTRL); - writel(data, base + CSPI_2_3_TXDATA); - cfg_reg |= CSPI_2_3_CTRL_XCH; - - writel(cfg_reg, base + CSPI_2_3_CTRL); - while (!(readl(base + CSPI_2_3_STAT) & CSPI_2_3_STAT_RR)); return readl(base + CSPI_2_3_RXDATA); @@ -306,6 +300,8 @@ static void cspi_2_3_chipselect(struct spi_device *spi, int is_active) ctrl |= (spi->bits_per_word - 1) << CSPI_2_3_CTRL_BL_OFFSET; + ctrl |= CSPI_2_3_CTRL_SMC; + cfg |= CSPI_2_3_CONFIG_SBBCTRL(cs); if (spi->mode & SPI_CPHA) |