1 files changed, 594 insertions, 180 deletions

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index f75767278fc3..e47686e0a633 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -27,64 +27,97 @@
 #include <plat/dma.h>
 #include <plat/mcbsp.h>
 
+#include "../mach-omap2/cm-regbits-34xx.h"
+
 struct omap_mcbsp **mcbsp_ptr;
-int omap_mcbsp_count;
+int omap_mcbsp_count, omap_mcbsp_cache_size;
 
-void omap_mcbsp_write(void __iomem *io_base, u16 reg, u32 val)
+void omap_mcbsp_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
 {
-	if (cpu_class_is_omap1() || cpu_is_omap2420())
-		__raw_writew((u16)val, io_base + reg);
-	else
-		__raw_writel(val, io_base + reg);
+	if (cpu_class_is_omap1()) {
+		((u16 *)mcbsp->reg_cache)[reg / sizeof(u16)] = (u16)val;
+		__raw_writew((u16)val, mcbsp->io_base + reg);
+	} else if (cpu_is_omap2420()) {
+		((u16 *)mcbsp->reg_cache)[reg / sizeof(u32)] = (u16)val;
+		__raw_writew((u16)val, mcbsp->io_base + reg);
+	} else {
+		((u32 *)mcbsp->reg_cache)[reg / sizeof(u32)] = val;
+		__raw_writel(val, mcbsp->io_base + reg);
+	}
 }
 
-int omap_mcbsp_read(void __iomem *io_base, u16 reg)
+int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg, bool from_cache)
 {
-	if (cpu_class_is_omap1() || cpu_is_omap2420())
-		return __raw_readw(io_base + reg);
-	else
-		return __raw_readl(io_base + reg);
+	if (cpu_class_is_omap1()) {
+		return !from_cache ? __raw_readw(mcbsp->io_base + reg) :
+				((u16 *)mcbsp->reg_cache)[reg / sizeof(u16)];
+	} else if (cpu_is_omap2420()) {
+		return !from_cache ? __raw_readw(mcbsp->io_base + reg) :
+				((u16 *)mcbsp->reg_cache)[reg / sizeof(u32)];
+	} else {
+		return !from_cache ? __raw_readl(mcbsp->io_base + reg) :
+				((u32 *)mcbsp->reg_cache)[reg / sizeof(u32)];
+	}
+}
+
+#ifdef CONFIG_ARCH_OMAP3
+void omap_mcbsp_st_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
+{
+	__raw_writel(val, mcbsp->st_data->io_base_st + reg);
+}
+
+int omap_mcbsp_st_read(struct omap_mcbsp *mcbsp, u16 reg)
+{
+	return __raw_readl(mcbsp->st_data->io_base_st + reg);
 }
+#endif
 
-#define OMAP_MCBSP_READ(base, reg) \
-			omap_mcbsp_read(base, OMAP_MCBSP_REG_##reg)
-#define OMAP_MCBSP_WRITE(base, reg, val) \
-			omap_mcbsp_write(base, OMAP_MCBSP_REG_##reg, val)
+#define MCBSP_READ(mcbsp, reg) \
+		omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 0)
+#define MCBSP_WRITE(mcbsp, reg, val) \
+		omap_mcbsp_write(mcbsp, OMAP_MCBSP_REG_##reg, val)
+#define MCBSP_READ_CACHE(mcbsp, reg) \
+		omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 1)
 
 #define omap_mcbsp_check_valid_id(id)	(id < omap_mcbsp_count)
 #define id_to_mcbsp_ptr(id)		mcbsp_ptr[id];
 
+#define MCBSP_ST_READ(mcbsp, reg) \
+			omap_mcbsp_st_read(mcbsp, OMAP_ST_REG_##reg)
+#define MCBSP_ST_WRITE(mcbsp, reg, val) \
+			omap_mcbsp_st_write(mcbsp, OMAP_ST_REG_##reg, val)
+
 static void omap_mcbsp_dump_reg(u8 id)
 {
 	struct omap_mcbsp *mcbsp = id_to_mcbsp_ptr(id);
 
 	dev_dbg(mcbsp->dev, "**** McBSP%d regs ****\n", mcbsp->id);
 	dev_dbg(mcbsp->dev, "DRR2:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, DRR2));
+			MCBSP_READ(mcbsp, DRR2));
 	dev_dbg(mcbsp->dev, "DRR1:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, DRR1));
+			MCBSP_READ(mcbsp, DRR1));
 	dev_dbg(mcbsp->dev, "DXR2:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, DXR2));
+			MCBSP_READ(mcbsp, DXR2));
 	dev_dbg(mcbsp->dev, "DXR1:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, DXR1));
+			MCBSP_READ(mcbsp, DXR1));
 	dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, SPCR2));
+			MCBSP_READ(mcbsp, SPCR2));
 	dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, SPCR1));
+			MCBSP_READ(mcbsp, SPCR1));
 	dev_dbg(mcbsp->dev, "RCR2:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, RCR2));
+			MCBSP_READ(mcbsp, RCR2));
 	dev_dbg(mcbsp->dev, "RCR1:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, RCR1));
+			MCBSP_READ(mcbsp, RCR1));
 	dev_dbg(mcbsp->dev, "XCR2:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, XCR2));
+			MCBSP_READ(mcbsp, XCR2));
 	dev_dbg(mcbsp->dev, "XCR1:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, XCR1));
+			MCBSP_READ(mcbsp, XCR1));
 	dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, SRGR2));
+			MCBSP_READ(mcbsp, SRGR2));
 	dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, SRGR1));
+			MCBSP_READ(mcbsp, SRGR1));
 	dev_dbg(mcbsp->dev, "PCR0:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp->io_base, PCR0));
+			MCBSP_READ(mcbsp, PCR0));
 	dev_dbg(mcbsp->dev, "***********************\n");
 }
 
@@ -93,15 +126,15 @@ static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
 	struct omap_mcbsp *mcbsp_tx = dev_id;
 	u16 irqst_spcr2;
 
-	irqst_spcr2 = OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2);
+	irqst_spcr2 = MCBSP_READ(mcbsp_tx, SPCR2);
 	dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n", irqst_spcr2);
 
 	if (irqst_spcr2 & XSYNC_ERR) {
 		dev_err(mcbsp_tx->dev, "TX Frame Sync Error! : 0x%x\n",
 			irqst_spcr2);
 		/* Writing zero to XSYNC_ERR clears the IRQ */
-		OMAP_MCBSP_WRITE(mcbsp_tx->io_base, SPCR2,
-			irqst_spcr2 & ~(XSYNC_ERR));
+		MCBSP_WRITE(mcbsp_tx, SPCR2,
+			    MCBSP_READ_CACHE(mcbsp_tx, SPCR2) & ~(XSYNC_ERR));
 	} else {
 		complete(&mcbsp_tx->tx_irq_completion);
 	}
@@ -114,15 +147,15 @@ static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
 	struct omap_mcbsp *mcbsp_rx = dev_id;
 	u16 irqst_spcr1;
 
-	irqst_spcr1 = OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR1);
+	irqst_spcr1 = MCBSP_READ(mcbsp_rx, SPCR1);
 	dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n", irqst_spcr1);
 
 	if (irqst_spcr1 & RSYNC_ERR) {
 		dev_err(mcbsp_rx->dev, "RX Frame Sync Error! : 0x%x\n",
 			irqst_spcr1);
 		/* Writing zero to RSYNC_ERR clears the IRQ */
-		OMAP_MCBSP_WRITE(mcbsp_rx->io_base, SPCR1,
-			irqst_spcr1 & ~(RSYNC_ERR));
+		MCBSP_WRITE(mcbsp_rx, SPCR1,
+			    MCBSP_READ_CACHE(mcbsp_rx, SPCR1) & ~(RSYNC_ERR));
 	} else {
 		complete(&mcbsp_rx->tx_irq_completion);
 	}
@@ -135,7 +168,7 @@ static void omap_mcbsp_tx_dma_callback(int lch, u16 ch_status, void *data)
 	struct omap_mcbsp *mcbsp_dma_tx = data;
 
 	dev_dbg(mcbsp_dma_tx->dev, "TX DMA callback : 0x%x\n",
-		OMAP_MCBSP_READ(mcbsp_dma_tx->io_base, SPCR2));
+		MCBSP_READ(mcbsp_dma_tx, SPCR2));
 
 	/* We can free the channels */
 	omap_free_dma(mcbsp_dma_tx->dma_tx_lch);
@@ -149,7 +182,7 @@ static void omap_mcbsp_rx_dma_callback(int lch, u16 ch_status, void *data)
 	struct omap_mcbsp *mcbsp_dma_rx = data;
 
 	dev_dbg(mcbsp_dma_rx->dev, "RX DMA callback : 0x%x\n",
-		OMAP_MCBSP_READ(mcbsp_dma_rx->io_base, SPCR2));
+		MCBSP_READ(mcbsp_dma_rx, SPCR2));
 
 	/* We can free the channels */
 	omap_free_dma(mcbsp_dma_rx->dma_rx_lch);
@@ -167,7 +200,6 @@ static void omap_mcbsp_rx_dma_callback(int lch, u16 ch_status, void *data)
 void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg *config)
 {
 	struct omap_mcbsp *mcbsp;
-	void __iomem *io_base;
 
 	if (!omap_mcbsp_check_valid_id(id)) {
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
@@ -175,30 +207,280 @@ void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg *config)
 	}
 	mcbsp = id_to_mcbsp_ptr(id);
 
-	io_base = mcbsp->io_base;
 	dev_dbg(mcbsp->dev, "Configuring McBSP%d  phys_base: 0x%08lx\n",
 			mcbsp->id, mcbsp->phys_base);
 
 	/* We write the given config */
-	OMAP_MCBSP_WRITE(io_base, SPCR2, config->spcr2);
-	OMAP_MCBSP_WRITE(io_base, SPCR1, config->spcr1);
-	OMAP_MCBSP_WRITE(io_base, RCR2, config->rcr2);
-	OMAP_MCBSP_WRITE(io_base, RCR1, config->rcr1);
-	OMAP_MCBSP_WRITE(io_base, XCR2, config->xcr2);
-	OMAP_MCBSP_WRITE(io_base, XCR1, config->xcr1);
-	OMAP_MCBSP_WRITE(io_base, SRGR2, config->srgr2);
-	OMAP_MCBSP_WRITE(io_base, SRGR1, config->srgr1);
-	OMAP_MCBSP_WRITE(io_base, MCR2, config->mcr2);
-	OMAP_MCBSP_WRITE(io_base, MCR1, config->mcr1);
-	OMAP_MCBSP_WRITE(io_base, PCR0, config->pcr0);
+	MCBSP_WRITE(mcbsp, SPCR2, config->spcr2);
+	MCBSP_WRITE(mcbsp, SPCR1, config->spcr1);
+	MCBSP_WRITE(mcbsp, RCR2, config->rcr2);
+	MCBSP_WRITE(mcbsp, RCR1, config->rcr1);
+	MCBSP_WRITE(mcbsp, XCR2, config->xcr2);
+	MCBSP_WRITE(mcbsp, XCR1, config->xcr1);
+	MCBSP_WRITE(mcbsp, SRGR2, config->srgr2);
+	MCBSP_WRITE(mcbsp, SRGR1, config->srgr1);
+	MCBSP_WRITE(mcbsp, MCR2, config->mcr2);
+	MCBSP_WRITE(mcbsp, MCR1, config->mcr1);
+	MCBSP_WRITE(mcbsp, PCR0, config->pcr0);
 	if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx()) {
-		OMAP_MCBSP_WRITE(io_base, XCCR, config->xccr);
-		OMAP_MCBSP_WRITE(io_base, RCCR, config->rccr);
+		MCBSP_WRITE(mcbsp, XCCR, config->xccr);
+		MCBSP_WRITE(mcbsp, RCCR, config->rccr);
 	}
 }
 EXPORT_SYMBOL(omap_mcbsp_config);
 
-#ifdef CONFIG_ARCH_OMAP34XX
+#ifdef CONFIG_ARCH_OMAP3
+static void omap_st_on(struct omap_mcbsp *mcbsp)
+{
+	unsigned int w;
+
+	/*
+	 * Sidetone uses McBSP ICLK - which must not idle when sidetones
+	 * are enabled or sidetones start sounding ugly.
+	 */
+	w = cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
+	w &= ~(1 << (mcbsp->id - 2));
+	cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
+
+	/* Enable McBSP Sidetone */
+	w = MCBSP_READ(mcbsp, SSELCR);
+	MCBSP_WRITE(mcbsp, SSELCR, w | SIDETONEEN);
+
+	w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
+	MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w & ~(ST_AUTOIDLE));
+
+	/* Enable Sidetone from Sidetone Core */
+	w = MCBSP_ST_READ(mcbsp, SSELCR);
+	MCBSP_ST_WRITE(mcbsp, SSELCR, w | ST_SIDETONEEN);
+}
+
+static void omap_st_off(struct omap_mcbsp *mcbsp)
+{
+	unsigned int w;
+
+	w = MCBSP_ST_READ(mcbsp, SSELCR);
+	MCBSP_ST_WRITE(mcbsp, SSELCR, w & ~(ST_SIDETONEEN));
+
+	w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
+	MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w | ST_AUTOIDLE);
+
+	w = MCBSP_READ(mcbsp, SSELCR);
+	MCBSP_WRITE(mcbsp, SSELCR, w & ~(SIDETONEEN));
+
+	w = cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
+	w |= 1 << (mcbsp->id - 2);
+	cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
+}
+
+static void omap_st_fir_write(struct omap_mcbsp *mcbsp, s16 *fir)
+{
+	u16 val, i;
+
+	val = MCBSP_ST_READ(mcbsp, SYSCONFIG);
+	MCBSP_ST_WRITE(mcbsp, SYSCONFIG, val & ~(ST_AUTOIDLE));
+
+	val = MCBSP_ST_READ(mcbsp, SSELCR);
+
+	if (val & ST_COEFFWREN)
+		MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
+
+	MCBSP_ST_WRITE(mcbsp, SSELCR, val | ST_COEFFWREN);
+
+	for (i = 0; i < 128; i++)
+		MCBSP_ST_WRITE(mcbsp, SFIRCR, fir[i]);
+
+	i = 0;
+
+	val = MCBSP_ST_READ(mcbsp, SSELCR);
+	while (!(val & ST_COEFFWRDONE) && (++i < 1000))
+		val = MCBSP_ST_READ(mcbsp, SSELCR);
+
+	MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
+
+	if (i == 1000)
+		dev_err(mcbsp->dev, "McBSP FIR load error!\n");
+}
+
+static void omap_st_chgain(struct omap_mcbsp *mcbsp)
+{
+	u16 w;
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+
+	w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
+	MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w & ~(ST_AUTOIDLE));
+
+	w = MCBSP_ST_READ(mcbsp, SSELCR);
+
+	MCBSP_ST_WRITE(mcbsp, SGAINCR, ST_CH0GAIN(st_data->ch0gain) | \
+		      ST_CH1GAIN(st_data->ch1gain));
+}
+
+int omap_st_set_chgain(unsigned int id, int channel, s16 chgain)
+{
+	struct omap_mcbsp *mcbsp;
+	struct omap_mcbsp_st_data *st_data;
+	int ret = 0;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+
+	mcbsp = id_to_mcbsp_ptr(id);
+	st_data = mcbsp->st_data;
+
+	if (!st_data)
+		return -ENOENT;
+
+	spin_lock_irq(&mcbsp->lock);
+	if (channel == 0)
+		st_data->ch0gain = chgain;
+	else if (channel == 1)
+		st_data->ch1gain = chgain;
+	else
+		ret = -EINVAL;
+
+	if (st_data->enabled)
+		omap_st_chgain(mcbsp);
+	spin_unlock_irq(&mcbsp->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(omap_st_set_chgain);
+
+int omap_st_get_chgain(unsigned int id, int channel, s16 *chgain)
+{
+	struct omap_mcbsp *mcbsp;
+	struct omap_mcbsp_st_data *st_data;
+	int ret = 0;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+
+	mcbsp = id_to_mcbsp_ptr(id);
+	st_data = mcbsp->st_data;
+
+	if (!st_data)
+		return -ENOENT;
+
+	spin_lock_irq(&mcbsp->lock);
+	if (channel == 0)
+		*chgain = st_data->ch0gain;
+	else if (channel == 1)
+		*chgain = st_data->ch1gain;
+	else
+		ret = -EINVAL;
+	spin_unlock_irq(&mcbsp->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(omap_st_get_chgain);
+
+static int omap_st_start(struct omap_mcbsp *mcbsp)
+{
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+
+	if (st_data && st_data->enabled && !st_data->running) {
+		omap_st_fir_write(mcbsp, st_data->taps);
+		omap_st_chgain(mcbsp);
+
+		if (!mcbsp->free) {
+			omap_st_on(mcbsp);
+			st_data->running = 1;
+		}
+	}
+
+	return 0;
+}
+
+int omap_st_enable(unsigned int id)
+{
+	struct omap_mcbsp *mcbsp;
+	struct omap_mcbsp_st_data *st_data;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+
+	mcbsp = id_to_mcbsp_ptr(id);
+	st_data = mcbsp->st_data;
+
+	if (!st_data)
+		return -ENODEV;
+
+	spin_lock_irq(&mcbsp->lock);
+	st_data->enabled = 1;
+	omap_st_start(mcbsp);
+	spin_unlock_irq(&mcbsp->lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_st_enable);
+
+static int omap_st_stop(struct omap_mcbsp *mcbsp)
+{
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+
+	if (st_data && st_data->running) {
+		if (!mcbsp->free) {
+			omap_st_off(mcbsp);
+			st_data->running = 0;
+		}
+	}
+
+	return 0;
+}
+
+int omap_st_disable(unsigned int id)
+{
+	struct omap_mcbsp *mcbsp;
+	struct omap_mcbsp_st_data *st_data;
+	int ret = 0;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+
+	mcbsp = id_to_mcbsp_ptr(id);
+	st_data = mcbsp->st_data;
+
+	if (!st_data)
+		return -ENODEV;
+
+	spin_lock_irq(&mcbsp->lock);
+	omap_st_stop(mcbsp);
+	st_data->enabled = 0;
+	spin_unlock_irq(&mcbsp->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(omap_st_disable);
+
+int omap_st_is_enabled(unsigned int id)
+{
+	struct omap_mcbsp *mcbsp;
+	struct omap_mcbsp_st_data *st_data;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+
+	mcbsp = id_to_mcbsp_ptr(id);
+	st_data = mcbsp->st_data;
+
+	if (!st_data)
+		return -ENODEV;
+
+
+	return st_data->enabled;
+}
+EXPORT_SYMBOL(omap_st_is_enabled);
+
 /*
  * omap_mcbsp_set_tx_threshold configures how to deal
  * with transmit threshold. the threshold value and handler can be
@@ -207,7 +489,6 @@ EXPORT_SYMBOL(omap_mcbsp_config);
 void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold)
 {
 	struct omap_mcbsp *mcbsp;
-	void __iomem *io_base;
 
 	if (!cpu_is_omap34xx())
 		return;
@@ -217,9 +498,8 @@ void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold)
 		return;
 	}
 	mcbsp = id_to_mcbsp_ptr(id);
-	io_base = mcbsp->io_base;
 
-	OMAP_MCBSP_WRITE(io_base, THRSH2, threshold);
+	MCBSP_WRITE(mcbsp, THRSH2, threshold);
 }
 EXPORT_SYMBOL(omap_mcbsp_set_tx_threshold);
 
@@ -231,7 +511,6 @@ EXPORT_SYMBOL(omap_mcbsp_set_tx_threshold);
 void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
 {
 	struct omap_mcbsp *mcbsp;
-	void __iomem *io_base;
 
 	if (!cpu_is_omap34xx())
 		return;
@@ -241,9 +520,8 @@ void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
 		return;
 	}
 	mcbsp = id_to_mcbsp_ptr(id);
-	io_base = mcbsp->io_base;
 
-	OMAP_MCBSP_WRITE(io_base, THRSH1, threshold);
+	MCBSP_WRITE(mcbsp, THRSH1, threshold);
 }
 EXPORT_SYMBOL(omap_mcbsp_set_rx_threshold);
 
@@ -313,19 +591,18 @@ static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp)
 	if (cpu_is_omap34xx()) {
 		u16 syscon;
 
-		syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
+		syscon = MCBSP_READ(mcbsp, SYSCON);
 		syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03) | CLOCKACTIVITY(0x03));
 
 		if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) {
 			syscon |= (ENAWAKEUP | SIDLEMODE(0x02) |
 					CLOCKACTIVITY(0x02));
-			OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN,
-					XRDYEN | RRDYEN);
+			MCBSP_WRITE(mcbsp, WAKEUPEN, XRDYEN | RRDYEN);
 		} else {
 			syscon |= SIDLEMODE(0x01);
 		}
 
-		OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
+		MCBSP_WRITE(mcbsp, SYSCON, syscon);
 	}
 }
 
@@ -337,7 +614,7 @@ static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp)
 	if (cpu_is_omap34xx()) {
 		u16 syscon;
 
-		syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
+		syscon = MCBSP_READ(mcbsp, SYSCON);
 		syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03) | CLOCKACTIVITY(0x03));
 		/*
 		 * HW bug workaround - If no_idle mode is taken, we need to
@@ -345,17 +622,19 @@ static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp)
 		 * device will not hit retention anymore.
 		 */
 		syscon |= SIDLEMODE(0x02);
-		OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
+		MCBSP_WRITE(mcbsp, SYSCON, syscon);
 
 		syscon &= ~(SIDLEMODE(0x03));
-		OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
+		MCBSP_WRITE(mcbsp, SYSCON, syscon);
 
-		OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, 0);
+		MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
 	}
 }
 #else
 static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp) {}
 static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp) {}
+static inline void omap_st_start(struct omap_mcbsp *mcbsp) {}
+static inline void omap_st_stop(struct omap_mcbsp *mcbsp) {}
 #endif
 
 /*
@@ -392,6 +671,7 @@ EXPORT_SYMBOL(omap_mcbsp_set_io_type);
 int omap_mcbsp_request(unsigned int id)
 {
 	struct omap_mcbsp *mcbsp;
+	void *reg_cache;
 	int err;
 
 	if (!omap_mcbsp_check_valid_id(id)) {
@@ -400,15 +680,21 @@ int omap_mcbsp_request(unsigned int id)
 	}
 	mcbsp = id_to_mcbsp_ptr(id);
 
+	reg_cache = kzalloc(omap_mcbsp_cache_size, GFP_KERNEL);
+	if (!reg_cache) {
+		return -ENOMEM;
+	}
+
 	spin_lock(&mcbsp->lock);
 	if (!mcbsp->free) {
 		dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
 			mcbsp->id);
-		spin_unlock(&mcbsp->lock);
-		return -EBUSY;
+		err = -EBUSY;
+		goto err_kfree;
 	}
 
 	mcbsp->free = 0;
+	mcbsp->reg_cache = reg_cache;
 	spin_unlock(&mcbsp->lock);
 
 	if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request)
@@ -424,8 +710,8 @@ int omap_mcbsp_request(unsigned int id)
 	 * Make sure that transmitter, receiver and sample-rate generator are
 	 * not running before activating IRQs.
 	 */
-	OMAP_MCBSP_WRITE(mcbsp->io_base, SPCR1, 0);
-	OMAP_MCBSP_WRITE(mcbsp->io_base, SPCR2, 0);
+	MCBSP_WRITE(mcbsp, SPCR1, 0);
+	MCBSP_WRITE(mcbsp, SPCR2, 0);
 
 	if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) {
 		/* We need to get IRQs here */
@@ -436,7 +722,7 @@ int omap_mcbsp_request(unsigned int id)
 			dev_err(mcbsp->dev, "Unable to request TX IRQ %d "
 					"for McBSP%d\n", mcbsp->tx_irq,
 					mcbsp->id);
-			goto error;
+			goto err_clk_disable;
 		}
 
 		init_completion(&mcbsp->rx_irq_completion);
@@ -446,16 +732,16 @@ int omap_mcbsp_request(unsigned int id)
 			dev_err(mcbsp->dev, "Unable to request RX IRQ %d "
 					"for McBSP%d\n", mcbsp->rx_irq,
 					mcbsp->id);
-			goto tx_irq;
+			goto err_free_irq;
 		}
 	}
 
 	return 0;
-tx_irq:
+err_free_irq:
 	free_irq(mcbsp->tx_irq, (void *)mcbsp);
-error:
+err_clk_disable:
 	if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
-			mcbsp->pdata->ops->free(id);
+		mcbsp->pdata->ops->free(id);
 
 	/* Do procedure specific to omap34xx arch, if applicable */
 	omap34xx_mcbsp_free(mcbsp);
@@ -463,7 +749,12 @@ error:
 	clk_disable(mcbsp->fclk);
 	clk_disable(mcbsp->iclk);
 
+	spin_lock(&mcbsp->lock);
 	mcbsp->free = 1;
+	mcbsp->reg_cache = NULL;
+err_kfree:
+	spin_unlock(&mcbsp->lock);
+	kfree(reg_cache);
 
 	return err;
 }
@@ -472,6 +763,7 @@ EXPORT_SYMBOL(omap_mcbsp_request);
 void omap_mcbsp_free(unsigned int id)
 {
 	struct omap_mcbsp *mcbsp;
+	void *reg_cache;
 
 	if (!omap_mcbsp_check_valid_id(id)) {
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
@@ -494,16 +786,18 @@ void omap_mcbsp_free(unsigned int id)
 		free_irq(mcbsp->tx_irq, (void *)mcbsp);
 	}
 
-	spin_lock(&mcbsp->lock);
-	if (mcbsp->free) {
-		dev_err(mcbsp->dev, "McBSP%d was not reserved\n",
-			mcbsp->id);
-		spin_unlock(&mcbsp->lock);
-		return;
-	}
+	reg_cache = mcbsp->reg_cache;
 
-	mcbsp->free = 1;
+	spin_lock(&mcbsp->lock);
+	if (mcbsp->free)
+		dev_err(mcbsp->dev, "McBSP%d was not reserved\n", mcbsp->id);
+	else
+		mcbsp->free = 1;
+	mcbsp->reg_cache = NULL;
 	spin_unlock(&mcbsp->lock);
+
+	if (reg_cache)
+		kfree(reg_cache);
 }
 EXPORT_SYMBOL(omap_mcbsp_free);
 
@@ -515,7 +809,6 @@ EXPORT_SYMBOL(omap_mcbsp_free);
 void omap_mcbsp_start(unsigned int id, int tx, int rx)
 {
 	struct omap_mcbsp *mcbsp;
-	void __iomem *io_base;
 	int idle;
 	u16 w;
 
@@ -524,28 +817,30 @@ void omap_mcbsp_start(unsigned int id, int tx, int rx)
 		return;
 	}
 	mcbsp = id_to_mcbsp_ptr(id);
-	io_base = mcbsp->io_base;
 
-	mcbsp->rx_word_length = (OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7;
-	mcbsp->tx_word_length = (OMAP_MCBSP_READ(io_base, XCR1) >> 5) & 0x7;
+	if (cpu_is_omap34xx())
+		omap_st_start(mcbsp);
+
+	mcbsp->rx_word_length = (MCBSP_READ_CACHE(mcbsp, RCR1) >> 5) & 0x7;
+	mcbsp->tx_word_length = (MCBSP_READ_CACHE(mcbsp, XCR1) >> 5) & 0x7;
 
-	idle = !((OMAP_MCBSP_READ(io_base, SPCR2) |
-		  OMAP_MCBSP_READ(io_base, SPCR1)) & 1);
+	idle = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
+			MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
 
 	if (idle) {
 		/* Start the sample generator */
-		w = OMAP_MCBSP_READ(io_base, SPCR2);
-		OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 6));
+		w = MCBSP_READ_CACHE(mcbsp, SPCR2);
+		MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 6));
 	}
 
 	/* Enable transmitter and receiver */
 	tx &= 1;
-	w = OMAP_MCBSP_READ(io_base, SPCR2);
-	OMAP_MCBSP_WRITE(io_base, SPCR2, w | tx);
+	w = MCBSP_READ_CACHE(mcbsp, SPCR2);
+	MCBSP_WRITE(mcbsp, SPCR2, w | tx);
 
 	rx &= 1;
-	w = OMAP_MCBSP_READ(io_base, SPCR1);
-	OMAP_MCBSP_WRITE(io_base, SPCR1, w | rx);
+	w = MCBSP_READ_CACHE(mcbsp, SPCR1);
+	MCBSP_WRITE(mcbsp, SPCR1, w | rx);
 
 	/*
 	 * Worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec
@@ -557,18 +852,18 @@ void omap_mcbsp_start(unsigned int id, int tx, int rx)
 
 	if (idle) {
 		/* Start frame sync */
-		w = OMAP_MCBSP_READ(io_base, SPCR2);
-		OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 7));
+		w = MCBSP_READ_CACHE(mcbsp, SPCR2);
+		MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 7));
 	}
 
 	if (cpu_is_omap2430() || cpu_is_omap34xx()) {
 		/* Release the transmitter and receiver */
-		w = OMAP_MCBSP_READ(io_base, XCCR);
+		w = MCBSP_READ_CACHE(mcbsp, XCCR);
 		w &= ~(tx ? XDISABLE : 0);
-		OMAP_MCBSP_WRITE(io_base, XCCR, w);
-		w = OMAP_MCBSP_READ(io_base, RCCR);
+		MCBSP_WRITE(mcbsp, XCCR, w);
+		w = MCBSP_READ_CACHE(mcbsp, RCCR);
 		w &= ~(rx ? RDISABLE : 0);
-		OMAP_MCBSP_WRITE(io_base, RCCR, w);
+		MCBSP_WRITE(mcbsp, RCCR, w);
 	}
 
 	/* Dump McBSP Regs */
@@ -579,7 +874,6 @@ EXPORT_SYMBOL(omap_mcbsp_start);
 void omap_mcbsp_stop(unsigned int id, int tx, int rx)
 {
 	struct omap_mcbsp *mcbsp;
-	void __iomem *io_base;
 	int idle;
 	u16 w;
 
@@ -589,36 +883,38 @@ void omap_mcbsp_stop(unsigned int id, int tx, int rx)
 	}
 
 	mcbsp = id_to_mcbsp_ptr(id);
-	io_base = mcbsp->io_base;
 
 	/* Reset transmitter */
 	tx &= 1;
 	if (cpu_is_omap2430() || cpu_is_omap34xx()) {
-		w = OMAP_MCBSP_READ(io_base, XCCR);
+		w = MCBSP_READ_CACHE(mcbsp, XCCR);
 		w |= (tx ? XDISABLE : 0);
-		OMAP_MCBSP_WRITE(io_base, XCCR, w);
+		MCBSP_WRITE(mcbsp, XCCR, w);
 	}
-	w = OMAP_MCBSP_READ(io_base, SPCR2);
-	OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~tx);
+	w = MCBSP_READ_CACHE(mcbsp, SPCR2);
+	MCBSP_WRITE(mcbsp, SPCR2, w & ~tx);
 
 	/* Reset receiver */
 	rx &= 1;
 	if (cpu_is_omap2430() || cpu_is_omap34xx()) {
-		w = OMAP_MCBSP_READ(io_base, RCCR);
+		w = MCBSP_READ_CACHE(mcbsp, RCCR);
 		w |= (rx ? RDISABLE : 0);
-		OMAP_MCBSP_WRITE(io_base, RCCR, w);
+		MCBSP_WRITE(mcbsp, RCCR, w);
 	}
-	w = OMAP_MCBSP_READ(io_base, SPCR1);
-	OMAP_MCBSP_WRITE(io_base, SPCR1, w & ~rx);
+	w = MCBSP_READ_CACHE(mcbsp, SPCR1);
+	MCBSP_WRITE(mcbsp, SPCR1, w & ~rx);
 
-	idle = !((OMAP_MCBSP_READ(io_base, SPCR2) |
-		  OMAP_MCBSP_READ(io_base, SPCR1)) & 1);
+	idle = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
+			MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
 
 	if (idle) {
 		/* Reset the sample rate generator */
-		w = OMAP_MCBSP_READ(io_base, SPCR2);
-		OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1 << 6));
+		w = MCBSP_READ_CACHE(mcbsp, SPCR2);
+		MCBSP_WRITE(mcbsp, SPCR2, w & ~(1 << 6));
 	}
+
+	if (cpu_is_omap34xx())
+		omap_st_stop(mcbsp);
 }
 EXPORT_SYMBOL(omap_mcbsp_stop);
 
@@ -626,7 +922,6 @@ EXPORT_SYMBOL(omap_mcbsp_stop);
 int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 {
 	struct omap_mcbsp *mcbsp;
-	void __iomem *base;
 
 	if (!omap_mcbsp_check_valid_id(id)) {
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
@@ -634,28 +929,27 @@ int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 	}
 
 	mcbsp = id_to_mcbsp_ptr(id);
-	base = mcbsp->io_base;
 
-	writew(buf, base + OMAP_MCBSP_REG_DXR1);
+	MCBSP_WRITE(mcbsp, DXR1, buf);
 	/* if frame sync error - clear the error */
-	if (readw(base + OMAP_MCBSP_REG_SPCR2) & XSYNC_ERR) {
+	if (MCBSP_READ(mcbsp, SPCR2) & XSYNC_ERR) {
 		/* clear error */
-		writew(readw(base + OMAP_MCBSP_REG_SPCR2) & (~XSYNC_ERR),
-		       base + OMAP_MCBSP_REG_SPCR2);
+		MCBSP_WRITE(mcbsp, SPCR2,
+				MCBSP_READ_CACHE(mcbsp, SPCR2) & (~XSYNC_ERR));
 		/* resend */
 		return -1;
 	} else {
 		/* wait for transmit confirmation */
 		int attemps = 0;
-		while (!(readw(base + OMAP_MCBSP_REG_SPCR2) & XRDY)) {
+		while (!(MCBSP_READ(mcbsp, SPCR2) & XRDY)) {
 			if (attemps++ > 1000) {
-				writew(readw(base + OMAP_MCBSP_REG_SPCR2) &
-				       (~XRST),
-				       base + OMAP_MCBSP_REG_SPCR2);
+				MCBSP_WRITE(mcbsp, SPCR2,
+						MCBSP_READ_CACHE(mcbsp, SPCR2) &
+						(~XRST));
 				udelay(10);
-				writew(readw(base + OMAP_MCBSP_REG_SPCR2) |
-				       (XRST),
-				       base + OMAP_MCBSP_REG_SPCR2);
+				MCBSP_WRITE(mcbsp, SPCR2,
+						MCBSP_READ_CACHE(mcbsp, SPCR2) |
+						(XRST));
 				udelay(10);
 				dev_err(mcbsp->dev, "Could not write to"
 					" McBSP%d Register\n", mcbsp->id);
@@ -671,7 +965,6 @@ EXPORT_SYMBOL(omap_mcbsp_pollwrite);
 int omap_mcbsp_pollread(unsigned int id, u16 *buf)
 {
 	struct omap_mcbsp *mcbsp;
-	void __iomem *base;
 
 	if (!omap_mcbsp_check_valid_id(id)) {
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
@@ -679,26 +972,25 @@ int omap_mcbsp_pollread(unsigned int id, u16 *buf)
 	}
 	mcbsp = id_to_mcbsp_ptr(id);
 
-	base = mcbsp->io_base;
 	/* if frame sync error - clear the error */
-	if (readw(base + OMAP_MCBSP_REG_SPCR1) & RSYNC_ERR) {
+	if (MCBSP_READ(mcbsp, SPCR1) & RSYNC_ERR) {
 		/* clear error */
-		writew(readw(base + OMAP_MCBSP_REG_SPCR1) & (~RSYNC_ERR),
-		       base + OMAP_MCBSP_REG_SPCR1);
+		MCBSP_WRITE(mcbsp, SPCR1,
+				MCBSP_READ_CACHE(mcbsp, SPCR1) & (~RSYNC_ERR));
 		/* resend */
 		return -1;
 	} else {
 		/* wait for recieve confirmation */
 		int attemps = 0;
-		while (!(readw(base + OMAP_MCBSP_REG_SPCR1) & RRDY)) {
+		while (!(MCBSP_READ(mcbsp, SPCR1) & RRDY)) {
 			if (attemps++ > 1000) {
-				writew(readw(base + OMAP_MCBSP_REG_SPCR1) &
-				       (~RRST),
-				       base + OMAP_MCBSP_REG_SPCR1);
+				MCBSP_WRITE(mcbsp, SPCR1,
+						MCBSP_READ_CACHE(mcbsp, SPCR1) &
+						(~RRST));
 				udelay(10);
-				writew(readw(base + OMAP_MCBSP_REG_SPCR1) |
-				       (RRST),
-				       base + OMAP_MCBSP_REG_SPCR1);
+				MCBSP_WRITE(mcbsp, SPCR1,
+						MCBSP_READ_CACHE(mcbsp, SPCR1) |
+						(RRST));
 				udelay(10);
 				dev_err(mcbsp->dev, "Could not read from"
 					" McBSP%d Register\n", mcbsp->id);
@@ -706,7 +998,7 @@ int omap_mcbsp_pollread(unsigned int id, u16 *buf)
 			}
 		}
 	}
-	*buf = readw(base + OMAP_MCBSP_REG_DRR1);
+	*buf = MCBSP_READ(mcbsp, DRR1);
 
 	return 0;
 }
@@ -718,7 +1010,6 @@ EXPORT_SYMBOL(omap_mcbsp_pollread);
 void omap_mcbsp_xmit_word(unsigned int id, u32 word)
 {
 	struct omap_mcbsp *mcbsp;
-	void __iomem *io_base;
 	omap_mcbsp_word_length word_length;
 
 	if (!omap_mcbsp_check_valid_id(id)) {
@@ -727,21 +1018,19 @@ void omap_mcbsp_xmit_word(unsigned int id, u32 word)
 	}
 
 	mcbsp = id_to_mcbsp_ptr(id);
-	io_base = mcbsp->io_base;
 	word_length = mcbsp->tx_word_length;
 
 	wait_for_completion(&mcbsp->tx_irq_completion);
 
 	if (word_length > OMAP_MCBSP_WORD_16)
-		OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
-	OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
+		MCBSP_WRITE(mcbsp, DXR2, word >> 16);
+	MCBSP_WRITE(mcbsp, DXR1, word & 0xffff);
 }
 EXPORT_SYMBOL(omap_mcbsp_xmit_word);
 
 u32 omap_mcbsp_recv_word(unsigned int id)
 {
 	struct omap_mcbsp *mcbsp;
-	void __iomem *io_base;
 	u16 word_lsb, word_msb = 0;
 	omap_mcbsp_word_length word_length;
 
@@ -752,13 +1041,12 @@ u32 omap_mcbsp_recv_word(unsigned int id)
 	mcbsp = id_to_mcbsp_ptr(id);
 
 	word_length = mcbsp->rx_word_length;
-	io_base = mcbsp->io_base;
 
 	wait_for_completion(&mcbsp->rx_irq_completion);
 
 	if (word_length > OMAP_MCBSP_WORD_16)
-		word_msb = OMAP_MCBSP_READ(io_base, DRR2);
-	word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
+		word_msb = MCBSP_READ(mcbsp, DRR2);
+	word_lsb = MCBSP_READ(mcbsp, DRR1);
 
 	return (word_lsb | (word_msb << 16));
 }
@@ -767,7 +1055,6 @@ EXPORT_SYMBOL(omap_mcbsp_recv_word);
 int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 {
 	struct omap_mcbsp *mcbsp;
-	void __iomem *io_base;
 	omap_mcbsp_word_length tx_word_length;
 	omap_mcbsp_word_length rx_word_length;
 	u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
@@ -777,7 +1064,6 @@ int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 		return -ENODEV;
 	}
 	mcbsp = id_to_mcbsp_ptr(id);
-	io_base = mcbsp->io_base;
 	tx_word_length = mcbsp->tx_word_length;
 	rx_word_length = mcbsp->rx_word_length;
 
@@ -785,14 +1071,16 @@ int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 		return -EINVAL;
 
 	/* First we wait for the transmitter to be ready */
-	spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
+	spcr2 = MCBSP_READ(mcbsp, SPCR2);
 	while (!(spcr2 & XRDY)) {
-		spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
+		spcr2 = MCBSP_READ(mcbsp, SPCR2);
 		if (attempts++ > 1000) {
 			/* We must reset the transmitter */
-			OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
+			MCBSP_WRITE(mcbsp, SPCR2,
+				    MCBSP_READ_CACHE(mcbsp, SPCR2) & (~XRST));
 			udelay(10);
-			OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
+			MCBSP_WRITE(mcbsp, SPCR2,
+				    MCBSP_READ_CACHE(mcbsp, SPCR2) | XRST);
 			udelay(10);
 			dev_err(mcbsp->dev, "McBSP%d transmitter not "
 				"ready\n", mcbsp->id);
@@ -802,18 +1090,20 @@ int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 
 	/* Now we can push the data */
 	if (tx_word_length > OMAP_MCBSP_WORD_16)
-		OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
-	OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
+		MCBSP_WRITE(mcbsp, DXR2, word >> 16);
+	MCBSP_WRITE(mcbsp, DXR1, word & 0xffff);
 
 	/* We wait for the receiver to be ready */
-	spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
+	spcr1 = MCBSP_READ(mcbsp, SPCR1);
 	while (!(spcr1 & RRDY)) {
-		spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
+		spcr1 = MCBSP_READ(mcbsp, SPCR1);
 		if (attempts++ > 1000) {
 			/* We must reset the receiver */
-			OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
+			MCBSP_WRITE(mcbsp, SPCR1,
+				    MCBSP_READ_CACHE(mcbsp, SPCR1) & (~RRST));
 			udelay(10);
-			OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
+			MCBSP_WRITE(mcbsp, SPCR1,
+				    MCBSP_READ_CACHE(mcbsp, SPCR1) | RRST);
 			udelay(10);
 			dev_err(mcbsp->dev, "McBSP%d receiver not "
 				"ready\n", mcbsp->id);
@@ -823,8 +1113,8 @@ int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 
 	/* Receiver is ready, let's read the dummy data */
 	if (rx_word_length > OMAP_MCBSP_WORD_16)
-		word_msb = OMAP_MCBSP_READ(io_base, DRR2);
-	word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
+		word_msb = MCBSP_READ(mcbsp, DRR2);
+	word_lsb = MCBSP_READ(mcbsp, DRR1);
 
 	return 0;
 }
@@ -834,7 +1124,6 @@ int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
 {
 	struct omap_mcbsp *mcbsp;
 	u32 clock_word = 0;
-	void __iomem *io_base;
 	omap_mcbsp_word_length tx_word_length;
 	omap_mcbsp_word_length rx_word_length;
 	u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
@@ -845,7 +1134,6 @@ int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
 	}
 
 	mcbsp = id_to_mcbsp_ptr(id);
-	io_base = mcbsp->io_base;
 
 	tx_word_length = mcbsp->tx_word_length;
 	rx_word_length = mcbsp->rx_word_length;
@@ -854,14 +1142,16 @@ int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
 		return -EINVAL;
 
 	/* First we wait for the transmitter to be ready */
-	spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
+	spcr2 = MCBSP_READ(mcbsp, SPCR2);
 	while (!(spcr2 & XRDY)) {
-		spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
+		spcr2 = MCBSP_READ(mcbsp, SPCR2);
 		if (attempts++ > 1000) {
 			/* We must reset the transmitter */
-			OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
+			MCBSP_WRITE(mcbsp, SPCR2,
+				    MCBSP_READ_CACHE(mcbsp, SPCR2) & (~XRST));
 			udelay(10);
-			OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
+			MCBSP_WRITE(mcbsp, SPCR2,
+				    MCBSP_READ_CACHE(mcbsp, SPCR2) | XRST);
 			udelay(10);
 			dev_err(mcbsp->dev, "McBSP%d transmitter not "
 				"ready\n", mcbsp->id);
@@ -871,18 +1161,20 @@ int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
 
 	/* We first need to enable the bus clock */
 	if (tx_word_length > OMAP_MCBSP_WORD_16)
-		OMAP_MCBSP_WRITE(io_base, DXR2, clock_word >> 16);
-	OMAP_MCBSP_WRITE(io_base, DXR1, clock_word & 0xffff);
+		MCBSP_WRITE(mcbsp, DXR2, clock_word >> 16);
+	MCBSP_WRITE(mcbsp, DXR1, clock_word & 0xffff);
 
 	/* We wait for the receiver to be ready */
-	spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
+	spcr1 = MCBSP_READ(mcbsp, SPCR1);
 	while (!(spcr1 & RRDY)) {
-		spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
+		spcr1 = MCBSP_READ(mcbsp, SPCR1);
 		if (attempts++ > 1000) {
 			/* We must reset the receiver */
-			OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
+			MCBSP_WRITE(mcbsp, SPCR1,
+				    MCBSP_READ_CACHE(mcbsp, SPCR1) & (~RRST));
 			udelay(10);
-			OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
+			MCBSP_WRITE(mcbsp, SPCR1,
+				    MCBSP_READ_CACHE(mcbsp, SPCR1) | RRST);
 			udelay(10);
 			dev_err(mcbsp->dev, "McBSP%d receiver not "
 				"ready\n", mcbsp->id);
@@ -892,8 +1184,8 @@ int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
 
 	/* Receiver is ready, there is something for us */
 	if (rx_word_length > OMAP_MCBSP_WORD_16)
-		word_msb = OMAP_MCBSP_READ(io_base, DRR2);
-	word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
+		word_msb = MCBSP_READ(mcbsp, DRR2);
+	word_lsb = MCBSP_READ(mcbsp, DRR1);
 
 	word[0] = (word_lsb | (word_msb << 16));
 
@@ -1107,7 +1399,7 @@ void omap_mcbsp_set_spi_mode(unsigned int id,
 }
 EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);
 
-#ifdef CONFIG_ARCH_OMAP34XX
+#ifdef CONFIG_ARCH_OMAP3
 #define max_thres(m)			(mcbsp->pdata->buffer_size)
 #define valid_threshold(m, val)		((val) <= max_thres(m))
 #define THRESHOLD_PROP_BUILDER(prop)					\
@@ -1198,6 +1490,64 @@ unlock:
 
 static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
 
+static ssize_t st_taps_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+	ssize_t status = 0;
+	int i;
+
+	spin_lock_irq(&mcbsp->lock);
+	for (i = 0; i < st_data->nr_taps; i++)
+		status += sprintf(&buf[status], (i ? ", %d" : "%d"),
+				  st_data->taps[i]);
+	if (i)
+		status += sprintf(&buf[status], "\n");
+	spin_unlock_irq(&mcbsp->lock);
+
+	return status;
+}
+
+static ssize_t st_taps_store(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t size)
+{
+	struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+	int val, tmp, status, i = 0;
+
+	spin_lock_irq(&mcbsp->lock);
+	memset(st_data->taps, 0, sizeof(st_data->taps));
+	st_data->nr_taps = 0;
+
+	do {
+		status = sscanf(buf, "%d%n", &val, &tmp);
+		if (status < 0 || status == 0) {
+			size = -EINVAL;
+			goto out;
+		}
+		if (val < -32768 || val > 32767) {
+			size = -EINVAL;
+			goto out;
+		}
+		st_data->taps[i++] = val;
+		buf += tmp;
+		if (*buf != ',')
+			break;
+		buf++;
+	} while (1);
+
+	st_data->nr_taps = i;
+
+out:
+	spin_unlock_irq(&mcbsp->lock);
+
+	return size;
+}
+
+static DEVICE_ATTR(st_taps, 0644, st_taps_show, st_taps_store);
+
 static const struct attribute *additional_attrs[] = {
 	&dev_attr_max_tx_thres.attr,
 	&dev_attr_max_rx_thres.attr,
@@ -1219,6 +1569,60 @@ static inline void __devexit omap_additional_remove(struct device *dev)
 	sysfs_remove_group(&dev->kobj, &additional_attr_group);
 }
 
+static const struct attribute *sidetone_attrs[] = {
+	&dev_attr_st_taps.attr,
+	NULL,
+};
+
+static const struct attribute_group sidetone_attr_group = {
+	.attrs = (struct attribute **)sidetone_attrs,
+};
+
+int __devinit omap_st_add(struct omap_mcbsp *mcbsp)
+{
+	struct omap_mcbsp_platform_data *pdata = mcbsp->pdata;
+	struct omap_mcbsp_st_data *st_data;
+	int err;
+
+	st_data = kzalloc(sizeof(*mcbsp->st_data), GFP_KERNEL);
+	if (!st_data) {
+		err = -ENOMEM;
+		goto err1;
+	}
+
+	st_data->io_base_st = ioremap(pdata->phys_base_st, SZ_4K);
+	if (!st_data->io_base_st) {
+		err = -ENOMEM;
+		goto err2;
+	}
+
+	err = sysfs_create_group(&mcbsp->dev->kobj, &sidetone_attr_group);
+	if (err)
+		goto err3;
+
+	mcbsp->st_data = st_data;
+	return 0;
+
+err3:
+	iounmap(st_data->io_base_st);
+err2:
+	kfree(st_data);
+err1:
+	return err;
+
+}
+
+static void __devexit omap_st_remove(struct omap_mcbsp *mcbsp)
+{
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+
+	if (st_data) {
+		sysfs_remove_group(&mcbsp->dev->kobj, &sidetone_attr_group);
+		iounmap(st_data->io_base_st);
+		kfree(st_data);
+	}
+}
+
 static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
 {
 	mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT;
@@ -1232,6 +1636,12 @@ static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
 		if (omap_additional_add(mcbsp->dev))
 			dev_warn(mcbsp->dev,
 				"Unable to create additional controls\n");
+
+		if (mcbsp->id == 2 || mcbsp->id == 3)
+			if (omap_st_add(mcbsp))
+				dev_warn(mcbsp->dev,
+				 "Unable to create sidetone controls\n");
+
 	} else {
 		mcbsp->max_tx_thres = -EINVAL;
 		mcbsp->max_rx_thres = -EINVAL;
@@ -1240,13 +1650,17 @@ static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
 
 static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp)
 {
-	if (cpu_is_omap34xx())
+	if (cpu_is_omap34xx()) {
 		omap_additional_remove(mcbsp->dev);
+
+		if (mcbsp->id == 2 || mcbsp->id == 3)
+			omap_st_remove(mcbsp);
+	}
 }
 #else
 static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp) {}
 static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp) {}
-#endif /* CONFIG_ARCH_OMAP34XX */
+#endif /* CONFIG_ARCH_OMAP3 */
 
 /*
  * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.