spi: omap3: Convert to driver model

index 8b0f665..11f8b12 100644
@@ -1,4 +1,6 @@
 /*
+ * Copyright (C) 2016 Jagan Teki <[email protected]>
+ *
  * Copyright (C) 2010 Dirk Behme <[email protected]>
  *
  * Driver for McSPI controller on OMAP3. Based on davinci_spi.c

@@ -15,10 +17,13 @@
  */
 
 #include <common.h>
+#include <dm.h>
 #include <spi.h>
 #include <malloc.h>
 #include <asm/io.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 #if defined(CONFIG_AM33XX) || defined(CONFIG_AM43XX)
 #define OMAP3_MCSPI1_BASE	0x48030100
 #define OMAP3_MCSPI2_BASE	0x481A0100

@@ -65,6 +70,8 @@
 #define OMAP3_MCSPI_CHCTRL_DIS		(0 << 0)
 
 #define OMAP3_MCSPI_WAKEUPENABLE_WKEN	BIT(0)
+#define MCSPI_PINDIR_D0_IN_D1_OUT	0
+#define MCSPI_PINDIR_D0_OUT_D1_IN	1
 
 #define OMAP3_MCSPI_MAX_FREQ		48000000
 #define SPI_WAIT_TIMEOUT		10

@@ -93,312 +100,123 @@ struct mcspi {
 					/* channel3: 0x68 - 0x78, bus 0 */
 };
 
-struct omap3_spi_slave {
-	struct spi_slave slave;
+struct omap3_spi_priv {
 	struct mcspi *regs;
+	unsigned int cs;
 	unsigned int freq;
 	unsigned int mode;
+	unsigned int wordlen;
+	unsigned int pin_dir:1;
 };
 
-static inline struct omap3_spi_slave *to_omap3_spi(struct spi_slave *slave)
-{
-	return container_of(slave, struct omap3_spi_slave, slave);
-}
-
-static void spi_reset(struct omap3_spi_slave *ds)
-{
-	unsigned int tmp;
-
-	writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, &ds->regs->sysconfig);
-	do {
-		tmp = readl(&ds->regs->sysstatus);
-	} while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE));
-
-	writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE |
-				 OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP |
-				 OMAP3_MCSPI_SYSCONFIG_SMARTIDLE,
-				 &ds->regs->sysconfig);
-
-	writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, &ds->regs->wakeupenable);
-}
-
-static void omap3_spi_write_chconf(struct omap3_spi_slave *ds, int val)
+static void omap3_spi_write_chconf(struct omap3_spi_priv *priv, int val)
 {
-	writel(val, &ds->regs->channel[ds->slave.cs].chconf);
+	writel(val, &priv->regs->channel[priv->cs].chconf);
 	/* Flash post writes to make immediate effect */
-	readl(&ds->regs->channel[ds->slave.cs].chconf);
+	readl(&priv->regs->channel[priv->cs].chconf);
 }
 
-static void omap3_spi_set_enable(struct omap3_spi_slave *ds, int enable)
+static void omap3_spi_set_enable(struct omap3_spi_priv *priv, int enable)
 {
-	writel(enable, &ds->regs->channel[ds->slave.cs].chctrl);
+	writel(enable, &priv->regs->channel[priv->cs].chctrl);
 	/* Flash post writes to make immediate effect */
-	readl(&ds->regs->channel[ds->slave.cs].chctrl);
-}
-
-void spi_init()
-{
-	/* do nothing */
+	readl(&priv->regs->channel[priv->cs].chctrl);
 }
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
-				  unsigned int max_hz, unsigned int mode)
-{
-	struct omap3_spi_slave	*ds;
-	struct mcspi *regs;
-
-	/*
-	 * OMAP3 McSPI (MultiChannel SPI) has 4 busses (modules)
-	 * with different number of chip selects (CS, channels):
-	 * McSPI1 has 4 CS (bus 0, cs 0 - 3)
-	 * McSPI2 has 2 CS (bus 1, cs 0 - 1)
-	 * McSPI3 has 2 CS (bus 2, cs 0 - 1)
-	 * McSPI4 has 1 CS (bus 3, cs 0)
-	 */
-
-	switch (bus) {
-	case 0:
-		regs = (struct mcspi *)OMAP3_MCSPI1_BASE;
-		break;
-#ifdef OMAP3_MCSPI2_BASE
-	case 1:
-		regs = (struct mcspi *)OMAP3_MCSPI2_BASE;
-		break;
-#endif
-#ifdef OMAP3_MCSPI3_BASE
-	case 2:
-		regs = (struct mcspi *)OMAP3_MCSPI3_BASE;
-		break;
-#endif
-#ifdef OMAP3_MCSPI4_BASE
-	case 3:
-		regs = (struct mcspi *)OMAP3_MCSPI4_BASE;
-		break;
-#endif
-	default:
-		printf("SPI error: unsupported bus %i. \
-			Supported busses 0 - 3\n", bus);
-		return NULL;
-	}
-
-	if (((bus == 0) && (cs > 3)) ||
-			((bus == 1) && (cs > 1)) ||
-			((bus == 2) && (cs > 1)) ||
-			((bus == 3) && (cs > 0))) {
-		printf("SPI error: unsupported chip select %i \
-			on bus %i\n", cs, bus);
-		return NULL;
-	}
-
-	if (max_hz > OMAP3_MCSPI_MAX_FREQ) {
-		printf("SPI error: unsupported frequency %i Hz. \
-			Max frequency is 48 Mhz\n", max_hz);
-		return NULL;
-	}
-
-	if (mode > SPI_MODE_3) {
-		printf("SPI error: unsupported SPI mode %i\n", mode);
-		return NULL;
-	}
-
-	ds = spi_alloc_slave(struct omap3_spi_slave, bus, cs);
-	if (!ds) {
-		printf("SPI error: malloc of SPI structure failed\n");
-		return NULL;
-	}
-
-	ds->regs = regs;
-	ds->freq = max_hz;
-	ds->mode = mode;
-
-	return &ds->slave;
-}
-
-void spi_free_slave(struct spi_slave *slave)
-{
-	struct omap3_spi_slave *ds = to_omap3_spi(slave);
-
-	free(ds);
-}
-
-int spi_claim_bus(struct spi_slave *slave)
-{
-	struct omap3_spi_slave *ds = to_omap3_spi(slave);
-	unsigned int conf, div = 0;
-
-	/* McSPI global module configuration */
-
-	/*
-	 * setup when switching from (reset default) slave mode
-	 * to single-channel master mode
-	 */
-	spi_reset(ds);
-	conf = readl(&ds->regs->modulctrl);
-	conf &= ~(OMAP3_MCSPI_MODULCTRL_STEST | OMAP3_MCSPI_MODULCTRL_MS);
-	conf |= OMAP3_MCSPI_MODULCTRL_SINGLE;
-	writel(conf, &ds->regs->modulctrl);
-
-	/* McSPI individual channel configuration */
-
-	/* Calculate clock divisor. Valid range: 0x0 - 0xC ( /1 - /4096 ) */
-	if (ds->freq) {
-		while (div <= 0xC && (OMAP3_MCSPI_MAX_FREQ / (1 << div))
-					 > ds->freq)
-			div++;
-	} else
-		div = 0xC;
-
-	conf = readl(&ds->regs->channel[ds->slave.cs].chconf);
-
-	/* standard 4-wire master mode:	SCK, MOSI/out, MISO/in, nCS
-	 * REVISIT: this controller could support SPI_3WIRE mode.
-	 */
-#ifdef CONFIG_OMAP3_SPI_D0_D1_SWAPPED
-	/*
-	 * Some boards have D0 wired as MOSI / D1 as MISO instead of
-	 * The normal D0 as MISO / D1 as MOSI.
-	 */
-	conf &= ~OMAP3_MCSPI_CHCONF_DPE0;
-	conf |= OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1;
-#else
-	conf &= ~(OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1);
-	conf |= OMAP3_MCSPI_CHCONF_DPE0;
-#endif
-
-	/* wordlength */
-	conf &= ~OMAP3_MCSPI_CHCONF_WL_MASK;
-	conf |= (ds->slave.wordlen - 1) << 7;
-
-	/* set chipselect polarity; manage with FORCE */
-	if (!(ds->mode & SPI_CS_HIGH))
-		conf |= OMAP3_MCSPI_CHCONF_EPOL; /* active-low; normal */
-	else
-		conf &= ~OMAP3_MCSPI_CHCONF_EPOL;
-
-	/* set clock divisor */
-	conf &= ~OMAP3_MCSPI_CHCONF_CLKD_MASK;
-	conf |= div << 2;
-
-	/* set SPI mode 0..3 */
-	if (ds->mode & SPI_CPOL)
-		conf |= OMAP3_MCSPI_CHCONF_POL;
-	else
-		conf &= ~OMAP3_MCSPI_CHCONF_POL;
-	if (ds->mode & SPI_CPHA)
-		conf |= OMAP3_MCSPI_CHCONF_PHA;
-	else
-		conf &= ~OMAP3_MCSPI_CHCONF_PHA;
-
-	/* Transmit & receive mode */
-	conf &= ~OMAP3_MCSPI_CHCONF_TRM_MASK;
-
-	omap3_spi_write_chconf(ds,conf);
-
-	return 0;
-}
-
-void spi_release_bus(struct spi_slave *slave)
-{
-	struct omap3_spi_slave *ds = to_omap3_spi(slave);
-
-	/* Reset the SPI hardware */
-	spi_reset(ds);
-}
-
-static int omap3_spi_write(struct spi_slave *slave, unsigned int len,
+static int omap3_spi_write(struct omap3_spi_priv *priv, unsigned int len,
 			   const void *txp, unsigned long flags)
 {
-	struct omap3_spi_slave *ds = to_omap3_spi(slave);
-	int i;
 	ulong start;
-	int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
+	int chconf, i;
+
+	chconf = readl(&priv->regs->channel[priv->cs].chconf);
 
 	/* Enable the channel */
-	omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
+	omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 
 	chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
-	chconf |= (ds->slave.wordlen - 1) << 7;
+	chconf |= (priv->wordlen - 1) << 7;
 	chconf |= OMAP3_MCSPI_CHCONF_TRM_TX_ONLY;
 	chconf |= OMAP3_MCSPI_CHCONF_FORCE;
-	omap3_spi_write_chconf(ds,chconf);
+	omap3_spi_write_chconf(priv, chconf);
 
 	for (i = 0; i < len; i++) {
 		/* wait till TX register is empty (TXS == 1) */
 		start = get_timer(0);
-		while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
+		while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 			 OMAP3_MCSPI_CHSTAT_TXS)) {
 			if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 				printf("SPI TXS timed out, status=0x%08x\n",
-				       readl(&ds->regs->channel[ds->slave.cs].chstat));
+				       readl(&priv->regs->channel[priv->cs].chstat));
 				return -1;
 			}
 		}
 		/* Write the data */
-		unsigned int *tx = &ds->regs->channel[ds->slave.cs].tx;
-		if (ds->slave.wordlen > 16)
+		unsigned int *tx = &priv->regs->channel[priv->cs].tx;
+		if (priv->wordlen > 16)
 			writel(((u32 *)txp)[i], tx);
-		else if (ds->slave.wordlen > 8)
+		else if (priv->wordlen > 8)
 			writel(((u16 *)txp)[i], tx);
 		else
 			writel(((u8 *)txp)[i], tx);
 	}
 
 	/* wait to finish of transfer */
-	while ((readl(&ds->regs->channel[ds->slave.cs].chstat) &
+	while ((readl(&priv->regs->channel[priv->cs].chstat) &
 			 (OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS)) !=
 			 (OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS));
 
 	/* Disable the channel otherwise the next immediate RX will get affected */
-	omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS);
+	omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 
 	if (flags & SPI_XFER_END) {
-
 		chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
-		omap3_spi_write_chconf(ds,chconf);
+		omap3_spi_write_chconf(priv, chconf);
 	}
+
 	return 0;
 }
 
-static int omap3_spi_read(struct spi_slave *slave, unsigned int len,
+static int omap3_spi_read(struct omap3_spi_priv *priv, unsigned int len,
 			  void *rxp, unsigned long flags)
 {
-	struct omap3_spi_slave *ds = to_omap3_spi(slave);
-	int i;
 	ulong start;
-	int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
+	int chconf, i;
+
+	chconf = readl(&priv->regs->channel[priv->cs].chconf);
 
 	/* Enable the channel */
-	omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
+	omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 
 	chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
-	chconf |= (ds->slave.wordlen - 1) << 7;
+	chconf |= (priv->wordlen - 1) << 7;
 	chconf |= OMAP3_MCSPI_CHCONF_TRM_RX_ONLY;
 	chconf |= OMAP3_MCSPI_CHCONF_FORCE;
-	omap3_spi_write_chconf(ds,chconf);
+	omap3_spi_write_chconf(priv, chconf);
 
-	writel(0, &ds->regs->channel[ds->slave.cs].tx);
+	writel(0, &priv->regs->channel[priv->cs].tx);
 
 	for (i = 0; i < len; i++) {
 		start = get_timer(0);
 		/* Wait till RX register contains data (RXS == 1) */
-		while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
+		while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 			 OMAP3_MCSPI_CHSTAT_RXS)) {
 			if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 				printf("SPI RXS timed out, status=0x%08x\n",
-				       readl(&ds->regs->channel[ds->slave.cs].chstat));
+				       readl(&priv->regs->channel[priv->cs].chstat));
 				return -1;
 			}
 		}
 
 		/* Disable the channel to prevent furher receiving */
-		if(i == (len - 1))
-			omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS);
+		if (i == (len - 1))
+			omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 
 		/* Read the data */
-		unsigned int *rx = &ds->regs->channel[ds->slave.cs].rx;
-		if (ds->slave.wordlen > 16)
+		unsigned int *rx = &priv->regs->channel[priv->cs].rx;
+		if (priv->wordlen > 16)
 			((u32 *)rxp)[i] = readl(rx);
-		else if (ds->slave.wordlen > 8)
+		else if (priv->wordlen > 8)
 			((u16 *)rxp)[i] = (u16)readl(rx);
 		else
 			((u8 *)rxp)[i] = (u8)readl(rx);

@@ -406,133 +224,459 @@ static int omap3_spi_read(struct spi_slave *slave, unsigned int len,
 
 	if (flags & SPI_XFER_END) {
 		chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
-		omap3_spi_write_chconf(ds,chconf);
+		omap3_spi_write_chconf(priv, chconf);
 	}
 
 	return 0;
 }
 
 /*McSPI Transmit Receive Mode*/
-static int omap3_spi_txrx(struct spi_slave *slave, unsigned int len,
+static int omap3_spi_txrx(struct omap3_spi_priv *priv, unsigned int len,
 			  const void *txp, void *rxp, unsigned long flags)
 {
-	struct omap3_spi_slave *ds = to_omap3_spi(slave);
 	ulong start;
-	int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
-	int i=0;
+	int chconf, i = 0;
+
+	chconf = readl(&priv->regs->channel[priv->cs].chconf);
 
 	/*Enable SPI channel*/
-	omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
+	omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 
 	/*set TRANSMIT-RECEIVE Mode*/
 	chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
-	chconf |= (ds->slave.wordlen - 1) << 7;
+	chconf |= (priv->wordlen - 1) << 7;
 	chconf |= OMAP3_MCSPI_CHCONF_FORCE;
-	omap3_spi_write_chconf(ds,chconf);
+	omap3_spi_write_chconf(priv, chconf);
 
 	/*Shift in and out 1 byte@time*/
-	for (i=0; i < len; i++){
+	for (i = 0; i < len; i++) {
 		/* Write: wait for TX empty (TXS == 1)*/
 		start = get_timer(0);
-		while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
+		while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 			 OMAP3_MCSPI_CHSTAT_TXS)) {
 			if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 				printf("SPI TXS timed out, status=0x%08x\n",
-				       readl(&ds->regs->channel[ds->slave.cs].chstat));
+				       readl(&priv->regs->channel[priv->cs].chstat));
 				return -1;
 			}
 		}
 		/* Write the data */
-		unsigned int *tx = &ds->regs->channel[ds->slave.cs].tx;
-		if (ds->slave.wordlen > 16)
+		unsigned int *tx = &priv->regs->channel[priv->cs].tx;
+		if (priv->wordlen > 16)
 			writel(((u32 *)txp)[i], tx);
-		else if (ds->slave.wordlen > 8)
+		else if (priv->wordlen > 8)
 			writel(((u16 *)txp)[i], tx);
 		else
 			writel(((u8 *)txp)[i], tx);
 
 		/*Read: wait for RX containing data (RXS == 1)*/
 		start = get_timer(0);
-		while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
+		while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 			 OMAP3_MCSPI_CHSTAT_RXS)) {
 			if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 				printf("SPI RXS timed out, status=0x%08x\n",
-				       readl(&ds->regs->channel[ds->slave.cs].chstat));
+				       readl(&priv->regs->channel[priv->cs].chstat));
 				return -1;
 			}
 		}
 		/* Read the data */
-		unsigned int *rx = &ds->regs->channel[ds->slave.cs].rx;
-		if (ds->slave.wordlen > 16)
+		unsigned int *rx = &priv->regs->channel[priv->cs].rx;
+		if (priv->wordlen > 16)
 			((u32 *)rxp)[i] = readl(rx);
-		else if (ds->slave.wordlen > 8)
+		else if (priv->wordlen > 8)
 			((u16 *)rxp)[i] = (u16)readl(rx);
 		else
 			((u8 *)rxp)[i] = (u8)readl(rx);
 	}
 	/* Disable the channel */
-	omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS);
+	omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 
 	/*if transfer must be terminated disable the channel*/
 	if (flags & SPI_XFER_END) {
 		chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
-		omap3_spi_write_chconf(ds,chconf);
+		omap3_spi_write_chconf(priv, chconf);
 	}
 
 	return 0;
 }
 
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
-	     const void *dout, void *din, unsigned long flags)
+static int _spi_xfer(struct omap3_spi_priv *priv, unsigned int bitlen,
+		     const void *dout, void *din, unsigned long flags)
 {
-	struct omap3_spi_slave *ds = to_omap3_spi(slave);
-	unsigned int	len;
+	unsigned int len;
 	int ret = -1;
 
-	if (ds->slave.wordlen < 4 || ds->slave.wordlen > 32) {
-		printf("omap3_spi: invalid wordlen %d\n", ds->slave.wordlen);
+	if (priv->wordlen < 4 || priv->wordlen > 32) {
+		printf("omap3_spi: invalid wordlen %d\n", priv->wordlen);
 		return -1;
 	}
 
-	if (bitlen % ds->slave.wordlen)
+	if (bitlen % priv->wordlen)
 		return -1;
 
-	len = bitlen / ds->slave.wordlen;
+	len = bitlen / priv->wordlen;
 
 	if (bitlen == 0) {	 /* only change CS */
-		int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
+		int chconf = readl(&priv->regs->channel[priv->cs].chconf);
 
 		if (flags & SPI_XFER_BEGIN) {
-			omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
+			omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 			chconf |= OMAP3_MCSPI_CHCONF_FORCE;
-			omap3_spi_write_chconf(ds,chconf);
+			omap3_spi_write_chconf(priv, chconf);
 		}
 		if (flags & SPI_XFER_END) {
 			chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
-			omap3_spi_write_chconf(ds,chconf);
-			omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS);
+			omap3_spi_write_chconf(priv, chconf);
+			omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 		}
 		ret = 0;
 	} else {
 		if (dout != NULL && din != NULL)
-			ret = omap3_spi_txrx(slave, len, dout, din, flags);
+			ret = omap3_spi_txrx(priv, len, dout, din, flags);
 		else if (dout != NULL)
-			ret = omap3_spi_write(slave, len, dout, flags);
+			ret = omap3_spi_write(priv, len, dout, flags);
 		else if (din != NULL)
-			ret = omap3_spi_read(slave, len, din, flags);
+			ret = omap3_spi_read(priv, len, din, flags);
 	}
 	return ret;
 }
 
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+static void _omap3_spi_set_speed(struct omap3_spi_priv *priv)
+{
+	uint32_t confr, div = 0;
+
+	confr = readl(&priv->regs->channel[priv->cs].chconf);
+
+	/* Calculate clock divisor. Valid range: 0x0 - 0xC ( /1 - /4096 ) */
+	if (priv->freq) {
+		while (div <= 0xC && (OMAP3_MCSPI_MAX_FREQ / (1 << div))
+					 > priv->freq)
+			div++;
+	} else {
+		div = 0xC;
+	}
+
+	/* set clock divisor */
+	confr &= ~OMAP3_MCSPI_CHCONF_CLKD_MASK;
+	confr |= div << 2;
+
+	omap3_spi_write_chconf(priv, confr);
+}
+
+static void _omap3_spi_set_mode(struct omap3_spi_priv *priv)
+{
+	uint32_t confr;
+
+	confr = readl(&priv->regs->channel[priv->cs].chconf);
+
+	/* standard 4-wire master mode:  SCK, MOSI/out, MISO/in, nCS
+	 * REVISIT: this controller could support SPI_3WIRE mode.
+	 */
+	if (priv->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) {
+		confr &= ~(OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1);
+		confr |= OMAP3_MCSPI_CHCONF_DPE0;
+	} else {
+		confr &= ~OMAP3_MCSPI_CHCONF_DPE0;
+		confr |= OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1;
+	}
+
+	/* set SPI mode 0..3 */
+	confr &= ~(OMAP3_MCSPI_CHCONF_POL | OMAP3_MCSPI_CHCONF_PHA);
+	if (priv->mode & SPI_CPHA)
+		confr |= OMAP3_MCSPI_CHCONF_PHA;
+	if (priv->mode & SPI_CPOL)
+		confr |= OMAP3_MCSPI_CHCONF_POL;
+
+	/* set chipselect polarity; manage with FORCE */
+	if (!(priv->mode & SPI_CS_HIGH))
+		confr |= OMAP3_MCSPI_CHCONF_EPOL; /* active-low; normal */
+	else
+		confr &= ~OMAP3_MCSPI_CHCONF_EPOL;
+
+	/* Transmit & receive mode */
+	confr &= ~OMAP3_MCSPI_CHCONF_TRM_MASK;
+
+	omap3_spi_write_chconf(priv, confr);
+}
+
+static void _omap3_spi_set_wordlen(struct omap3_spi_priv *priv)
 {
-	return 1;
+	unsigned int confr;
+
+	/* McSPI individual channel configuration */
+	confr = readl(&priv->regs->channel[priv->wordlen].chconf);
+
+	/* wordlength */
+	confr &= ~OMAP3_MCSPI_CHCONF_WL_MASK;
+	confr |= (priv->wordlen - 1) << 7;
+
+	omap3_spi_write_chconf(priv, confr);
 }
 
-void spi_cs_activate(struct spi_slave *slave)
+static void spi_reset(struct mcspi *regs)
 {
+	unsigned int tmp;
+
+	writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, &regs->sysconfig);
+	do {
+		tmp = readl(&regs->sysstatus);
+	} while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE));
+
+	writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE |
+				 OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP |
+				 OMAP3_MCSPI_SYSCONFIG_SMARTIDLE,
+				 &regs->sysconfig);
+
+	writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, &regs->wakeupenable);
 }
 
-void spi_cs_deactivate(struct spi_slave *slave)
+static void _omap3_spi_claim_bus(struct omap3_spi_priv *priv)
 {
+	unsigned int conf;
+
+	spi_reset(priv->regs);
+
+	/*
+	 * setup when switching from (reset default) slave mode
+	 * to single-channel master mode
+	 */
+	conf = readl(&priv->regs->modulctrl);
+	conf &= ~(OMAP3_MCSPI_MODULCTRL_STEST | OMAP3_MCSPI_MODULCTRL_MS);
+	conf |= OMAP3_MCSPI_MODULCTRL_SINGLE;
+
+	writel(conf, &priv->regs->modulctrl);
+
+	_omap3_spi_set_mode(priv);
+	_omap3_spi_set_speed(priv);
 }
+
+#ifndef CONFIG_DM_SPI
+
+struct omap3_spi_slave {
+	struct spi_slave	slave;
+	struct omap3_spi_priv	spi_priv;
+};
+
+struct omap3_spi_priv *priv;
+
+static inline struct omap3_spi_slave *to_omap3_spi(struct spi_slave *slave)
+{
+	return container_of(slave, struct omap3_spi_slave, slave);
+}
+
+void spi_init(void)
+{
+	/* do nothing */
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+	struct omap3_spi_slave *ds = to_omap3_spi(slave);
+
+	free(ds);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+	_omap3_spi_claim_bus(priv);
+	_omap3_spi_set_wordlen(priv);
+	_omap3_spi_set_mode(priv);
+	_omap3_spi_set_speed(priv);
+
+	return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+	/* Reset the SPI hardware */
+	spi_reset(priv->regs);
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+				  unsigned int max_hz, unsigned int mode)
+{
+	struct omap3_spi_slave *ds;
+	struct mcspi *regs;
+
+	/*
+	 * OMAP3 McSPI (MultiChannel SPI) has 4 busses (modules)
+	 * with different number of chip selects (CS, channels):
+	 * McSPI1 has 4 CS (bus 0, cs 0 - 3)
+	 * McSPI2 has 2 CS (bus 1, cs 0 - 1)
+	 * McSPI3 has 2 CS (bus 2, cs 0 - 1)
+	 * McSPI4 has 1 CS (bus 3, cs 0)
+	 */
+
+	switch (bus) {
+	case 0:
+		regs = (struct mcspi *)OMAP3_MCSPI1_BASE;
+		break;
+#ifdef OMAP3_MCSPI2_BASE
+	case 1:
+		regs = (struct mcspi *)OMAP3_MCSPI2_BASE;
+		break;
+#endif
+#ifdef OMAP3_MCSPI3_BASE
+	case 2:
+		regs = (struct mcspi *)OMAP3_MCSPI3_BASE;
+		break;
+#endif
+#ifdef OMAP3_MCSPI4_BASE
+	case 3:
+		regs = (struct mcspi *)OMAP3_MCSPI4_BASE;
+		break;
+#endif
+	default:
+		printf("SPI error: unsupported bus %i. \
+			Supported busses 0 - 3\n", bus);
+		return NULL;
+	}
+
+	if (((bus == 0) && (cs > 3)) ||
+	    ((bus == 1) && (cs > 1)) ||
+	    ((bus == 2) && (cs > 1)) ||
+	    ((bus == 3) && (cs > 0))) {
+		printf("SPI error: unsupported chip select %i \
+			on bus %i\n", cs, bus);
+		return NULL;
+	}
+
+	if (max_hz > OMAP3_MCSPI_MAX_FREQ) {
+		printf("SPI error: unsupported frequency %i Hz. \
+			Max frequency is 48 Mhz\n", max_hz);
+		return NULL;
+	}
+
+	if (mode > SPI_MODE_3) {
+		printf("SPI error: unsupported SPI mode %i\n", mode);
+		return NULL;
+	}
+
+	ds = spi_alloc_slave(struct omap3_spi_slave, bus, cs);
+	if (!ds) {
+		printf("SPI error: malloc of SPI structure failed\n");
+		return NULL;
+	}
+
+	priv = &ds->spi_priv;
+
+	priv->regs = regs;
+	priv->cs = cs;
+	priv->freq = max_hz;
+	priv->mode = mode;
+	priv->wordlen = ds->slave.wordlen;
+#ifdef CONFIG_OMAP3_SPI_D0_D1_SWAPPED
+	priv->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN;
+#endif
+
+	return &ds->slave;
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
+	     const void *dout, void *din, unsigned long flags)
+{
+	return _spi_xfer(priv, bitlen, dout, din, flags);
+}
+
+#else
+
+static int omap3_spi_claim_bus(struct udevice *dev)
+{
+	struct udevice *bus = dev->parent;
+	struct omap3_spi_priv *priv = dev_get_priv(bus);
+	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
+
+	priv->cs = slave_plat->cs;
+	priv->mode = slave_plat->mode;
+	priv->freq = slave_plat->max_hz;
+	_omap3_spi_claim_bus(priv);
+
+	return 0;
+}
+
+static int omap3_spi_release_bus(struct udevice *dev)
+{
+	struct udevice *bus = dev->parent;
+	struct omap3_spi_priv *priv = dev_get_priv(bus);
+
+	/* Reset the SPI hardware */
+	spi_reset(priv->regs);
+
+	return 0;
+}
+
+static int omap3_spi_set_wordlen(struct udevice *dev, unsigned int wordlen)
+{
+	struct udevice *bus = dev->parent;
+	struct omap3_spi_priv *priv = dev_get_priv(bus);
+	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
+
+	priv->cs = slave_plat->cs;
+	priv->wordlen = wordlen;
+	_omap3_spi_set_wordlen(priv);
+
+	return 0;
+}
+
+static int omap3_spi_probe(struct udevice *dev)
+{
+	struct udevice *bus = dev->parent;
+	struct omap3_spi_priv *priv = dev_get_priv(bus);
+	const void *blob = gd->fdt_blob;
+	int node = bus->of_offset;
+
+	priv->regs = (struct mcspi *)dev_get_addr(bus);
+	priv->pin_dir = fdtdec_get_uint(blob, node, "ti,pindir-d0-out-d1-in",
+					MCSPI_PINDIR_D0_IN_D1_OUT);
+
+	return 0;
+}
+
+static int omap3_spi_xfer(struct udevice *dev, unsigned int bitlen,
+			  const void *dout, void *din, unsigned long flags)
+{
+	struct udevice *bus = dev->parent;
+	struct omap3_spi_priv *priv = dev_get_priv(bus);
+
+	return _spi_xfer(priv, bitlen, dout, din, flags);
+}
+
+static int omap3_spi_set_speed(struct udevice *bus, unsigned int speed)
+{
+	return 0;
+}
+
+static int omap3_spi_set_mode(struct udevice *bus, uint mode)
+{
+	return 0;
+}
+
+static const struct dm_spi_ops omap3_spi_ops = {
+	.claim_bus	= omap3_spi_claim_bus,
+	.release_bus	= omap3_spi_release_bus,
+	.set_wordlen	= omap3_spi_set_wordlen,
+	.xfer		= omap3_spi_xfer,
+	.set_speed	= omap3_spi_set_speed,
+	.set_mode	= omap3_spi_set_mode,
+	/*
+	 * cs_info is not needed, since we require all chip selects to be
+	 * in the device tree explicitly
+	 */
+};
+
+static const struct udevice_id omap3_spi_ids[] = {
+	{ .compatible = "ti,omap2-mcspi" },
+	{ .compatible = "ti,omap4-mcspi" },
+	{ }
+};
+
+U_BOOT_DRIVER(omap3_spi) = {
+	.name   = "omap3_spi",
+	.id     = UCLASS_SPI,
+	.of_match = omap3_spi_ids,
+	.probe = omap3_spi_probe,
+	.ops    = &omap3_spi_ops,
+	.priv_auto_alloc_size = sizeof(struct omap3_spi_priv),
+	.probe = omap3_spi_probe,
+};
+#endif