>From c13e2181154c793a71e132ab374bba1720ca421c Mon Sep 17 00:00:00 2001 From: Hemanth V <[email protected]> Date: Fri, 27 Nov 2009 14:37:20 +0530 Subject: [PATCH] Add McSPI slave support.
This patch adds support for mcspi slave mode. Signed-off-by: Hemanth V <[email protected]> --- drivers/spi/omap2_mcspi.c | 22 ++++++++++++++++------ 1 files changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c index d8e8ea0..f6041bf 100644 --- a/drivers/spi/omap2_mcspi.c +++ b/drivers/spi/omap2_mcspi.c @@ -428,6 +428,16 @@ static void omap2_mcspi_set_master_mode(struct spi_master *master) omap2_mcspi_ctx[master->bus_num - 1].modulctrl = l; } +static void omap2_mcspi_set_slave_mode(struct spi_master *master) +{ + u32 l; + + l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL); + MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_STEST, 0); + MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_MS, 1); + mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l); +} + static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit) { unsigned long timeout; @@ -827,10 +837,11 @@ static int omap2_mcspi_setup_transfer(struct spi_device *spi, l &= ~(OMAP2_MCSPI_CHCONF_IS|OMAP2_MCSPI_CHCONF_DPE1); l |= OMAP2_MCSPI_CHCONF_DPE0; } else { - return -EINVAL; + l |= OMAP2_MCSPI_CHCONF_IS; + l |= OMAP2_MCSPI_CHCONF_DPE1; + l &= ~OMAP2_MCSPI_CHCONF_DPE0; } - /* wordlength */ l &= ~OMAP2_MCSPI_CHCONF_WL_MASK; l |= (word_len - 1) << 7; @@ -1216,7 +1227,6 @@ static int __init omap2_mcspi_reset(struct omap2_mcspi *mcspi) { struct spi_master *master = mcspi->master; u32 tmp; - u32 error = 0; if (omap2_mcspi_enable_clocks(mcspi)) return -1; @@ -1240,10 +1250,10 @@ static int __init omap2_mcspi_reset(struct omap2_mcspi *mcspi) if (mcspi->mcspi_mode == OMAP2_MCSPI_MASTER) omap2_mcspi_set_master_mode(master); else - error = -EINVAL; + omap2_mcspi_set_slave_mode(master); omap2_mcspi_disable_clocks(mcspi); - return error; + return 0; } static u8 __initdata spi1_rxdma_id [] = { @@ -1355,7 +1365,7 @@ static int __init omap2_mcspi_probe(struct platform_device *pdev) mcspi = spi_master_get_devdata(master); mcspi->master = master; - mcspi->mcspi_mode = OMAP2_MCSPI_MASTER; + mcspi->mcspi_mode = pdata->mode; mcspi->dma_mode = pdata->dma_mode; mcspi->force_cs_mode = pdata->force_cs_mode; -- 1.5.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
