ARM: OMAP: Allocate McBSP devices dynamically

Based on Chandra's earlier patches in linux-omap tree.

Note that omap1_mcbsp_check and omap2_mcbsp_check are no longer
needed as there's now omap_mcbsp_check_valid_id() defined.

Also some functions can now be marked __init.

Signed-off-by: Chandra Shekhar <x0044955@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 225 insertions, 163 deletions

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index e0803a8344be..f27e641bf814 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -27,43 +27,65 @@
 #include <mach/dma.h>
 #include <mach/mcbsp.h>
 
-static struct omap_mcbsp mcbsp[OMAP_MAX_MCBSP_COUNT];
+struct omap_mcbsp **mcbsp_ptr;
+int omap_mcbsp_count;
 
-#define omap_mcbsp_check_valid_id(id)	(mcbsp[id].pdata && \
-					mcbsp[id].pdata->ops && \
-					mcbsp[id].pdata->ops->check && \
-					(mcbsp[id].pdata->ops->check(id) == 0))
+void omap_mcbsp_write(void __iomem *io_base, 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);
+}
+
+int omap_mcbsp_read(void __iomem *io_base, u16 reg)
+{
+	if (cpu_class_is_omap1() || cpu_is_omap2420())
+		return __raw_readw(io_base + reg);
+	else
+		return __raw_readl(io_base + reg);
+}
+
+#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 omap_mcbsp_check_valid_id(id)	(id < omap_mcbsp_count)
+#define id_to_mcbsp_ptr(id)		mcbsp_ptr[id];
 
 static void omap_mcbsp_dump_reg(u8 id)
 {
-	dev_dbg(mcbsp[id].dev, "**** McBSP%d regs ****\n", mcbsp[id].id);
-	dev_dbg(mcbsp[id].dev, "DRR2:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, DRR2));
-	dev_dbg(mcbsp[id].dev, "DRR1:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, DRR1));
-	dev_dbg(mcbsp[id].dev, "DXR2:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, DXR2));
-	dev_dbg(mcbsp[id].dev, "DXR1:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, DXR1));
-	dev_dbg(mcbsp[id].dev, "SPCR2: 0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR2));
-	dev_dbg(mcbsp[id].dev, "SPCR1: 0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR1));
-	dev_dbg(mcbsp[id].dev, "RCR2:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, RCR2));
-	dev_dbg(mcbsp[id].dev, "RCR1:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, RCR1));
-	dev_dbg(mcbsp[id].dev, "XCR2:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, XCR2));
-	dev_dbg(mcbsp[id].dev, "XCR1:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, XCR1));
-	dev_dbg(mcbsp[id].dev, "SRGR2: 0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR2));
-	dev_dbg(mcbsp[id].dev, "SRGR1: 0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR1));
-	dev_dbg(mcbsp[id].dev, "PCR0:  0x%04x\n",
-			OMAP_MCBSP_READ(mcbsp[id].io_base, PCR0));
-	dev_dbg(mcbsp[id].dev, "***********************\n");
+	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));
+	dev_dbg(mcbsp->dev, "DRR1:  0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, DRR1));
+	dev_dbg(mcbsp->dev, "DXR2:  0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, DXR2));
+	dev_dbg(mcbsp->dev, "DXR1:  0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, DXR1));
+	dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, SPCR2));
+	dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, SPCR1));
+	dev_dbg(mcbsp->dev, "RCR2:  0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, RCR2));
+	dev_dbg(mcbsp->dev, "RCR1:  0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, RCR1));
+	dev_dbg(mcbsp->dev, "XCR2:  0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, XCR2));
+	dev_dbg(mcbsp->dev, "XCR1:  0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, XCR1));
+	dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, SRGR2));
+	dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, SRGR1));
+	dev_dbg(mcbsp->dev, "PCR0:  0x%04x\n",
+			OMAP_MCBSP_READ(mcbsp->io_base, PCR0));
+	dev_dbg(mcbsp->dev, "***********************\n");
 }
 
 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
@@ -126,16 +148,18 @@ 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);
 		return;
 	}
+	mcbsp = id_to_mcbsp_ptr(id);
 
-	io_base = mcbsp[id].io_base;
-	dev_dbg(mcbsp[id].dev, "Configuring McBSP%d  phys_base: 0x%08lx\n",
-			mcbsp[id].id, mcbsp[id].phys_base);
+	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);
@@ -158,23 +182,26 @@ EXPORT_SYMBOL(omap_mcbsp_config);
  */
 int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type)
 {
+	struct omap_mcbsp *mcbsp;
+
 	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);
 
-	spin_lock(&mcbsp[id].lock);
+	spin_lock(&mcbsp->lock);
 
-	if (!mcbsp[id].free) {
-		dev_err(mcbsp[id].dev, "McBSP%d is currently in use\n",
-			mcbsp[id].id);
-		spin_unlock(&mcbsp[id].lock);
+	if (!mcbsp->free) {
+		dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
+			mcbsp->id);
+		spin_unlock(&mcbsp->lock);
 		return -EINVAL;
 	}
 
-	mcbsp[id].io_type = io_type;
+	mcbsp->io_type = io_type;
 
-	spin_unlock(&mcbsp[id].lock);
+	spin_unlock(&mcbsp->lock);
 
 	return 0;
 }
@@ -182,53 +209,55 @@ EXPORT_SYMBOL(omap_mcbsp_set_io_type);
 
 int omap_mcbsp_request(unsigned int id)
 {
+	struct omap_mcbsp *mcbsp;
 	int err;
 
 	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);
 
-	if (mcbsp[id].pdata->ops->request)
-		mcbsp[id].pdata->ops->request(id);
+	if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request)
+		mcbsp->pdata->ops->request(id);
 
-	clk_enable(mcbsp[id].clk);
+	clk_enable(mcbsp->clk);
 
-	spin_lock(&mcbsp[id].lock);
-	if (!mcbsp[id].free) {
-		dev_err(mcbsp[id].dev, "McBSP%d is currently in use\n",
-			mcbsp[id].id);
-		spin_unlock(&mcbsp[id].lock);
+	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 -1;
 	}
 
-	mcbsp[id].free = 0;
-	spin_unlock(&mcbsp[id].lock);
+	mcbsp->free = 0;
+	spin_unlock(&mcbsp->lock);
 
-	if (mcbsp[id].io_type == OMAP_MCBSP_IRQ_IO) {
+	if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) {
 		/* We need to get IRQs here */
-		err = request_irq(mcbsp[id].tx_irq, omap_mcbsp_tx_irq_handler,
-					0, "McBSP", (void *) (&mcbsp[id]));
+		err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler,
+					0, "McBSP", (void *)mcbsp);
 		if (err != 0) {
-			dev_err(mcbsp[id].dev, "Unable to request TX IRQ %d "
-					"for McBSP%d\n", mcbsp[id].tx_irq,
-					mcbsp[id].id);
+			dev_err(mcbsp->dev, "Unable to request TX IRQ %d "
+					"for McBSP%d\n", mcbsp->tx_irq,
+					mcbsp->id);
 			return err;
 		}
 
-		init_completion(&(mcbsp[id].tx_irq_completion));
+		init_completion(&mcbsp->tx_irq_completion);
 
-		err = request_irq(mcbsp[id].rx_irq, omap_mcbsp_rx_irq_handler,
-					0, "McBSP", (void *) (&mcbsp[id]));
+		err = request_irq(mcbsp->rx_irq, omap_mcbsp_rx_irq_handler,
+					0, "McBSP", (void *)mcbsp);
 		if (err != 0) {
-			dev_err(mcbsp[id].dev, "Unable to request RX IRQ %d "
-					"for McBSP%d\n", mcbsp[id].rx_irq,
-					mcbsp[id].id);
-			free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id]));
+			dev_err(mcbsp->dev, "Unable to request RX IRQ %d "
+					"for McBSP%d\n", mcbsp->rx_irq,
+					mcbsp->id);
+			free_irq(mcbsp->tx_irq, (void *)mcbsp);
 			return err;
 		}
 
-		init_completion(&(mcbsp[id].rx_irq_completion));
+		init_completion(&mcbsp->rx_irq_completion);
 	}
 
 	return 0;
@@ -237,31 +266,34 @@ EXPORT_SYMBOL(omap_mcbsp_request);
 
 void omap_mcbsp_free(unsigned int id)
 {
+	struct omap_mcbsp *mcbsp;
+
 	if (!omap_mcbsp_check_valid_id(id)) {
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 		return;
 	}
+	mcbsp = id_to_mcbsp_ptr(id);
 
-	if (mcbsp[id].pdata->ops->free)
-		mcbsp[id].pdata->ops->free(id);
+	if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
+		mcbsp->pdata->ops->free(id);
 
-	clk_disable(mcbsp[id].clk);
+	clk_disable(mcbsp->clk);
 
-	spin_lock(&mcbsp[id].lock);
-	if (mcbsp[id].free) {
-		dev_err(mcbsp[id].dev, "McBSP%d was not reserved\n",
-			mcbsp[id].id);
-		spin_unlock(&mcbsp[id].lock);
+	spin_lock(&mcbsp->lock);
+	if (mcbsp->free) {
+		dev_err(mcbsp->dev, "McBSP%d was not reserved\n",
+			mcbsp->id);
+		spin_unlock(&mcbsp->lock);
 		return;
 	}
 
-	mcbsp[id].free = 1;
-	spin_unlock(&mcbsp[id].lock);
+	mcbsp->free = 1;
+	spin_unlock(&mcbsp->lock);
 
-	if (mcbsp[id].io_type == OMAP_MCBSP_IRQ_IO) {
+	if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) {
 		/* Free IRQs */
-		free_irq(mcbsp[id].rx_irq, (void *) (&mcbsp[id]));
-		free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id]));
+		free_irq(mcbsp->rx_irq, (void *)mcbsp);
+		free_irq(mcbsp->tx_irq, (void *)mcbsp);
 	}
 }
 EXPORT_SYMBOL(omap_mcbsp_free);
@@ -273,6 +305,7 @@ EXPORT_SYMBOL(omap_mcbsp_free);
  */
 void omap_mcbsp_start(unsigned int id)
 {
+	struct omap_mcbsp *mcbsp;
 	void __iomem *io_base;
 	u16 w;
 
@@ -280,11 +313,11 @@ void omap_mcbsp_start(unsigned int id)
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 		return;
 	}
+	mcbsp = id_to_mcbsp_ptr(id);
+	io_base = mcbsp->io_base;
 
-	io_base = mcbsp[id].io_base;
-
-	mcbsp[id].rx_word_length = (OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7;
-	mcbsp[id].tx_word_length = (OMAP_MCBSP_READ(io_base, XCR1) >> 5) & 0x7;
+	mcbsp->rx_word_length = (OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7;
+	mcbsp->tx_word_length = (OMAP_MCBSP_READ(io_base, XCR1) >> 5) & 0x7;
 
 	/* Start the sample generator */
 	w = OMAP_MCBSP_READ(io_base, SPCR2);
@@ -310,6 +343,7 @@ EXPORT_SYMBOL(omap_mcbsp_start);
 
 void omap_mcbsp_stop(unsigned int id)
 {
+	struct omap_mcbsp *mcbsp;
 	void __iomem *io_base;
 	u16 w;
 
@@ -318,7 +352,8 @@ void omap_mcbsp_stop(unsigned int id)
 		return;
 	}
 
-	io_base = mcbsp[id].io_base;
+	mcbsp = id_to_mcbsp_ptr(id);
+	io_base = mcbsp->io_base;
 
 	/* Reset transmitter */
 	w = OMAP_MCBSP_READ(io_base, SPCR2);
@@ -337,6 +372,7 @@ EXPORT_SYMBOL(omap_mcbsp_stop);
 /* polled mcbsp i/o operations */
 int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 {
+	struct omap_mcbsp *mcbsp;
 	void __iomem *base;
 
 	if (!omap_mcbsp_check_valid_id(id)) {
@@ -344,7 +380,9 @@ int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 		return -ENODEV;
 	}
 
-	base = mcbsp[id].io_base;
+	mcbsp = id_to_mcbsp_ptr(id);
+	base = mcbsp->io_base;
+
 	writew(buf, base + OMAP_MCBSP_REG_DXR1);
 	/* if frame sync error - clear the error */
 	if (readw(base + OMAP_MCBSP_REG_SPCR2) & XSYNC_ERR) {
@@ -366,8 +404,8 @@ int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 				       (XRST),
 				       base + OMAP_MCBSP_REG_SPCR2);
 				udelay(10);
-				dev_err(mcbsp[id].dev, "Could not write to"
-					" McBSP%d Register\n", mcbsp[id].id);
+				dev_err(mcbsp->dev, "Could not write to"
+					" McBSP%d Register\n", mcbsp->id);
 				return -2;
 			}
 		}
@@ -379,14 +417,16 @@ 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);
 		return -ENODEV;
 	}
+	mcbsp = id_to_mcbsp_ptr(id);
 
-	base = mcbsp[id].io_base;
+	base = mcbsp->io_base;
 	/* if frame sync error - clear the error */
 	if (readw(base + OMAP_MCBSP_REG_SPCR1) & RSYNC_ERR) {
 		/* clear error */
@@ -407,8 +447,8 @@ int omap_mcbsp_pollread(unsigned int id, u16 *buf)
 				       (RRST),
 				       base + OMAP_MCBSP_REG_SPCR1);
 				udelay(10);
-				dev_err(mcbsp[id].dev, "Could not read from"
-					" McBSP%d Register\n", mcbsp[id].id);
+				dev_err(mcbsp->dev, "Could not read from"
+					" McBSP%d Register\n", mcbsp->id);
 				return -2;
 			}
 		}
@@ -424,6 +464,7 @@ 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;
 
@@ -432,10 +473,11 @@ void omap_mcbsp_xmit_word(unsigned int id, u32 word)
 		return;
 	}
 
-	io_base = mcbsp[id].io_base;
-	word_length = mcbsp[id].tx_word_length;
+	mcbsp = id_to_mcbsp_ptr(id);
+	io_base = mcbsp->io_base;
+	word_length = mcbsp->tx_word_length;
 
-	wait_for_completion(&(mcbsp[id].tx_irq_completion));
+	wait_for_completion(&mcbsp->tx_irq_completion);
 
 	if (word_length > OMAP_MCBSP_WORD_16)
 		OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
@@ -445,6 +487,7 @@ 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;
@@ -453,11 +496,12 @@ u32 omap_mcbsp_recv_word(unsigned int id)
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 		return -ENODEV;
 	}
+	mcbsp = id_to_mcbsp_ptr(id);
 
-	word_length = mcbsp[id].rx_word_length;
-	io_base = mcbsp[id].io_base;
+	word_length = mcbsp->rx_word_length;
+	io_base = mcbsp->io_base;
 
-	wait_for_completion(&(mcbsp[id].rx_irq_completion));
+	wait_for_completion(&mcbsp->rx_irq_completion);
 
 	if (word_length > OMAP_MCBSP_WORD_16)
 		word_msb = OMAP_MCBSP_READ(io_base, DRR2);
@@ -469,6 +513,7 @@ 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;
@@ -478,10 +523,10 @@ int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 		return -ENODEV;
 	}
-
-	io_base = mcbsp[id].io_base;
-	tx_word_length = mcbsp[id].tx_word_length;
-	rx_word_length = mcbsp[id].rx_word_length;
+	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;
 
 	if (tx_word_length != rx_word_length)
 		return -EINVAL;
@@ -496,8 +541,8 @@ int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 			udelay(10);
 			OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
 			udelay(10);
-			dev_err(mcbsp[id].dev, "McBSP%d transmitter not "
-				"ready\n", mcbsp[id].id);
+			dev_err(mcbsp->dev, "McBSP%d transmitter not "
+				"ready\n", mcbsp->id);
 			return -EAGAIN;
 		}
 	}
@@ -517,8 +562,8 @@ int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 			udelay(10);
 			OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
 			udelay(10);
-			dev_err(mcbsp[id].dev, "McBSP%d receiver not "
-				"ready\n", mcbsp[id].id);
+			dev_err(mcbsp->dev, "McBSP%d receiver not "
+				"ready\n", mcbsp->id);
 			return -EAGAIN;
 		}
 	}
@@ -534,6 +579,7 @@ EXPORT_SYMBOL(omap_mcbsp_spi_master_xmit_word_poll);
 
 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;
@@ -545,9 +591,11 @@ int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
 		return -ENODEV;
 	}
 
-	io_base = mcbsp[id].io_base;
-	tx_word_length = mcbsp[id].tx_word_length;
-	rx_word_length = mcbsp[id].rx_word_length;
+	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;
 
 	if (tx_word_length != rx_word_length)
 		return -EINVAL;
@@ -562,8 +610,8 @@ int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
 			udelay(10);
 			OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
 			udelay(10);
-			dev_err(mcbsp[id].dev, "McBSP%d transmitter not "
-				"ready\n", mcbsp[id].id);
+			dev_err(mcbsp->dev, "McBSP%d transmitter not "
+				"ready\n", mcbsp->id);
 			return -EAGAIN;
 		}
 	}
@@ -583,8 +631,8 @@ int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
 			udelay(10);
 			OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
 			udelay(10);
-			dev_err(mcbsp[id].dev, "McBSP%d receiver not "
-				"ready\n", mcbsp[id].id);
+			dev_err(mcbsp->dev, "McBSP%d receiver not "
+				"ready\n", mcbsp->id);
 			return -EAGAIN;
 		}
 	}
@@ -610,6 +658,7 @@ EXPORT_SYMBOL(omap_mcbsp_spi_master_recv_word_poll);
 int omap_mcbsp_xmit_buffer(unsigned int id, dma_addr_t buffer,
 				unsigned int length)
 {
+	struct omap_mcbsp *mcbsp;
 	int dma_tx_ch;
 	int src_port = 0;
 	int dest_port = 0;
@@ -619,50 +668,51 @@ int omap_mcbsp_xmit_buffer(unsigned int id, dma_addr_t buffer,
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 		return -ENODEV;
 	}
+	mcbsp = id_to_mcbsp_ptr(id);
 
-	if (omap_request_dma(mcbsp[id].dma_tx_sync, "McBSP TX",
+	if (omap_request_dma(mcbsp->dma_tx_sync, "McBSP TX",
 				omap_mcbsp_tx_dma_callback,
-				&mcbsp[id],
+				mcbsp,
 				&dma_tx_ch)) {
-		dev_err(mcbsp[id].dev, " Unable to request DMA channel for "
+		dev_err(mcbsp->dev, " Unable to request DMA channel for "
 				"McBSP%d TX. Trying IRQ based TX\n",
-				mcbsp[id].id);
+				mcbsp->id);
 		return -EAGAIN;
 	}
-	mcbsp[id].dma_tx_lch = dma_tx_ch;
+	mcbsp->dma_tx_lch = dma_tx_ch;
 
-	dev_err(mcbsp[id].dev, "McBSP%d TX DMA on channel %d\n", mcbsp[id].id,
+	dev_err(mcbsp->dev, "McBSP%d TX DMA on channel %d\n", mcbsp->id,
 		dma_tx_ch);
 
-	init_completion(&(mcbsp[id].tx_dma_completion));
+	init_completion(&mcbsp->tx_dma_completion);
 
 	if (cpu_class_is_omap1()) {
 		src_port = OMAP_DMA_PORT_TIPB;
 		dest_port = OMAP_DMA_PORT_EMIFF;
 	}
 	if (cpu_class_is_omap2())
-		sync_dev = mcbsp[id].dma_tx_sync;
+		sync_dev = mcbsp->dma_tx_sync;
 
-	omap_set_dma_transfer_params(mcbsp[id].dma_tx_lch,
+	omap_set_dma_transfer_params(mcbsp->dma_tx_lch,
 				     OMAP_DMA_DATA_TYPE_S16,
 				     length >> 1, 1,
 				     OMAP_DMA_SYNC_ELEMENT,
 	 sync_dev, 0);
 
-	omap_set_dma_dest_params(mcbsp[id].dma_tx_lch,
+	omap_set_dma_dest_params(mcbsp->dma_tx_lch,
 				 src_port,
 				 OMAP_DMA_AMODE_CONSTANT,
-				 mcbsp[id].phys_base + OMAP_MCBSP_REG_DXR1,
+				 mcbsp->phys_base + OMAP_MCBSP_REG_DXR1,
 				 0, 0);
 
-	omap_set_dma_src_params(mcbsp[id].dma_tx_lch,
+	omap_set_dma_src_params(mcbsp->dma_tx_lch,
 				dest_port,
 				OMAP_DMA_AMODE_POST_INC,
 				buffer,
 				0, 0);
 
-	omap_start_dma(mcbsp[id].dma_tx_lch);
-	wait_for_completion(&(mcbsp[id].tx_dma_completion));
+	omap_start_dma(mcbsp->dma_tx_lch);
+	wait_for_completion(&mcbsp->tx_dma_completion);
 
 	return 0;
 }
@@ -671,6 +721,7 @@ EXPORT_SYMBOL(omap_mcbsp_xmit_buffer);
 int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer,
 				unsigned int length)
 {
+	struct omap_mcbsp *mcbsp;
 	int dma_rx_ch;
 	int src_port = 0;
 	int dest_port = 0;
@@ -680,50 +731,51 @@ int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer,
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 		return -ENODEV;
 	}
+	mcbsp = id_to_mcbsp_ptr(id);
 
-	if (omap_request_dma(mcbsp[id].dma_rx_sync, "McBSP RX",
+	if (omap_request_dma(mcbsp->dma_rx_sync, "McBSP RX",
 				omap_mcbsp_rx_dma_callback,
-				&mcbsp[id],
+				mcbsp,
 				&dma_rx_ch)) {
-		dev_err(mcbsp[id].dev, "Unable to request DMA channel for "
+		dev_err(mcbsp->dev, "Unable to request DMA channel for "
 				"McBSP%d RX. Trying IRQ based RX\n",
-				mcbsp[id].id);
+				mcbsp->id);
 		return -EAGAIN;
 	}
-	mcbsp[id].dma_rx_lch = dma_rx_ch;
+	mcbsp->dma_rx_lch = dma_rx_ch;
 
-	dev_err(mcbsp[id].dev, "McBSP%d RX DMA on channel %d\n", mcbsp[id].id,
+	dev_err(mcbsp->dev, "McBSP%d RX DMA on channel %d\n", mcbsp->id,
 		dma_rx_ch);
 
-	init_completion(&(mcbsp[id].rx_dma_completion));
+	init_completion(&mcbsp->rx_dma_completion);
 
 	if (cpu_class_is_omap1()) {
 		src_port = OMAP_DMA_PORT_TIPB;
 		dest_port = OMAP_DMA_PORT_EMIFF;
 	}
 	if (cpu_class_is_omap2())
-		sync_dev = mcbsp[id].dma_rx_sync;
+		sync_dev = mcbsp->dma_rx_sync;
 
-	omap_set_dma_transfer_params(mcbsp[id].dma_rx_lch,
+	omap_set_dma_transfer_params(mcbsp->dma_rx_lch,
 					OMAP_DMA_DATA_TYPE_S16,
 					length >> 1, 1,
 					OMAP_DMA_SYNC_ELEMENT,
 					sync_dev, 0);
 
-	omap_set_dma_src_params(mcbsp[id].dma_rx_lch,
+	omap_set_dma_src_params(mcbsp->dma_rx_lch,
 				src_port,
 				OMAP_DMA_AMODE_CONSTANT,
-				mcbsp[id].phys_base + OMAP_MCBSP_REG_DRR1,
+				mcbsp->phys_base + OMAP_MCBSP_REG_DRR1,
 				0, 0);
 
-	omap_set_dma_dest_params(mcbsp[id].dma_rx_lch,
+	omap_set_dma_dest_params(mcbsp->dma_rx_lch,
 					dest_port,
 					OMAP_DMA_AMODE_POST_INC,
 					buffer,
 					0, 0);
 
-	omap_start_dma(mcbsp[id].dma_rx_lch);
-	wait_for_completion(&(mcbsp[id].rx_dma_completion));
+	omap_start_dma(mcbsp->dma_rx_lch);
+	wait_for_completion(&mcbsp->rx_dma_completion);
 
 	return 0;
 }
@@ -738,12 +790,14 @@ EXPORT_SYMBOL(omap_mcbsp_recv_buffer);
 void omap_mcbsp_set_spi_mode(unsigned int id,
 				const struct omap_mcbsp_spi_cfg *spi_cfg)
 {
+	struct omap_mcbsp *mcbsp;
 	struct omap_mcbsp_reg_cfg mcbsp_cfg;
 
 	if (!omap_mcbsp_check_valid_id(id)) {
 		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 		return;
 	}
+	mcbsp = id_to_mcbsp_ptr(id);
 
 	memset(&mcbsp_cfg, 0, sizeof(struct omap_mcbsp_reg_cfg));
 
@@ -807,6 +861,7 @@ EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);
 static int __devinit omap_mcbsp_probe(struct platform_device *pdev)
 {
 	struct omap_mcbsp_platform_data *pdata = pdev->dev.platform_data;
+	struct omap_mcbsp *mcbsp;
 	int id = pdev->id - 1;
 	int ret = 0;
 
@@ -819,51 +874,58 @@ static int __devinit omap_mcbsp_probe(struct platform_device *pdev)
 
 	dev_dbg(&pdev->dev, "Initializing OMAP McBSP (%d).\n", pdev->id);
 
-	if (id >= OMAP_MAX_MCBSP_COUNT) {
+	if (id >= omap_mcbsp_count) {
 		dev_err(&pdev->dev, "Invalid McBSP device id (%d)\n", id);
 		ret = -EINVAL;
 		goto exit;
 	}
 
-	spin_lock_init(&mcbsp[id].lock);
-	mcbsp[id].id = id + 1;
-	mcbsp[id].free = 1;
-	mcbsp[id].dma_tx_lch = -1;
-	mcbsp[id].dma_rx_lch = -1;
+	mcbsp = kzalloc(sizeof(struct omap_mcbsp), GFP_KERNEL);
+	if (!mcbsp) {
+		ret = -ENOMEM;
+		goto exit;
+	}
+	mcbsp_ptr[id] = mcbsp;
+
+	spin_lock_init(&mcbsp->lock);
+	mcbsp->id = id + 1;
+	mcbsp->free = 1;
+	mcbsp->dma_tx_lch = -1;
+	mcbsp->dma_rx_lch = -1;
 
-	mcbsp[id].phys_base = pdata->phys_base;
-	mcbsp[id].io_base = ioremap(pdata->phys_base, SZ_4K);
-	if (!mcbsp[id].io_base) {
+	mcbsp->phys_base = pdata->phys_base;
+	mcbsp->io_base = ioremap(pdata->phys_base, SZ_4K);
+	if (!mcbsp->io_base) {
 		ret = -ENOMEM;
 		goto err_ioremap;
 	}
 
 	/* Default I/O is IRQ based */
-	mcbsp[id].io_type = OMAP_MCBSP_IRQ_IO;
-	mcbsp[id].tx_irq = pdata->tx_irq;
-	mcbsp[id].rx_irq = pdata->rx_irq;
-	mcbsp[id].dma_rx_sync = pdata->dma_rx_sync;
-	mcbsp[id].dma_tx_sync = pdata->dma_tx_sync;
+	mcbsp->io_type = OMAP_MCBSP_IRQ_IO;
+	mcbsp->tx_irq = pdata->tx_irq;
+	mcbsp->rx_irq = pdata->rx_irq;
+	mcbsp->dma_rx_sync = pdata->dma_rx_sync;
+	mcbsp->dma_tx_sync = pdata->dma_tx_sync;
 
 	if (pdata->clk_name)
-		mcbsp[id].clk = clk_get(&pdev->dev, pdata->clk_name);
-	if (IS_ERR(mcbsp[id].clk)) {
+		mcbsp->clk = clk_get(&pdev->dev, pdata->clk_name);
+	if (IS_ERR(mcbsp->clk)) {
 		dev_err(&pdev->dev,
 			"Invalid clock configuration for McBSP%d.\n",
-			mcbsp[id].id);
-		ret = PTR_ERR(mcbsp[id].clk);
+			mcbsp->id);
+		ret = PTR_ERR(mcbsp->clk);
 		goto err_clk;
 	}
 
-	mcbsp[id].pdata = pdata;
-	mcbsp[id].dev = &pdev->dev;
-	platform_set_drvdata(pdev, &mcbsp[id]);
+	mcbsp->pdata = pdata;
+	mcbsp->dev = &pdev->dev;
+	platform_set_drvdata(pdev, mcbsp);
 	return 0;
 
 err_clk:
-	iounmap(mcbsp[id].io_base);
+	iounmap(mcbsp->io_base);
 err_ioremap:
-	mcbsp[id].free = 0;
+	mcbsp->free = 0;
 exit:
 	return ret;
 }