[v2,10/11] OMAP: DMA: Use DMA device attributes
diff mbox

Message ID 1282647866-6918-11-git-send-email-manjugk@ti.com
State Changes Requested
Delegated to: Kevin Hilman
Headers show

Commit Message

manjugk manjugk Aug. 24, 2010, 11:04 a.m. UTC
None

Patch
diff mbox

diff --git a/arch/arm/mach-omap1/dma.c b/arch/arm/mach-omap1/dma.c
index 615c5f5..563e60f 100644
--- a/arch/arm/mach-omap1/dma.c
+++ b/arch/arm/mach-omap1/dma.c
@@ -140,13 +140,177 @@  static struct resource res[] __initdata = {
 };
 
 static void __iomem *dma_base;
+static struct omap_dma_lch *dma_chan;
+struct omap_dma_dev_attr *d;
+
+u32 enable_1510_mode;
+
+#define OMAP_FUNC_MUX_ARM_BASE		(0xfffe1000 + 0xec)
+static inline int omap1_get_gdma_dev(int req)
+{
+	u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
+	int shift = ((req - 1) % 5) * 6;
+
+	return ((omap_readl(reg) >> shift) & 0x3f) + 1;
+}
+
+static inline void omap1_set_gdma_dev(int req, int dev)
+{
+	u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
+	int shift = ((req - 1) % 5) * 6;
+	u32 l;
+
+	l = omap_readl(reg);
+	l &= ~(0x3f << shift);
+	l |= (dev - 1) << shift;
+	omap_writel(l, reg);
+}
+
+static void omap1_clear_lch_regs(int lch)
+{
+	int i;
+	void __iomem *lch_base = dma_base + OMAP1_DMA_CH_BASE(lch);
+
+	for (i = 0; i < 0x2c; i += 2)
+		__raw_writew(0, lch_base + i);
+}
+
+static inline void omap1_enable_channel_irq(int lch)
+{
+	u32 status;
+
+	status = dma_read(CSR(lch));
+	dma_write(dma_chan[lch].enabled_irqs, CICR(lch));
+}
+
+static void omap1_disable_channel_irq(int lch)
+{
+	return;
+}
+
+static inline void omap1_enable_lnk(int lch)
+{
+	u32 l;
+
+	l = dma_read(CLNK_CTRL(lch));
+
+	l &= ~(1 << 14);
+
+	/* Set the ENABLE_LNK bits */
+	if (dma_chan[lch].next_lch != -1)
+		l = dma_chan[lch].next_lch | (1 << 15);
+
+	dma_write(l, CLNK_CTRL(lch));
+}
+
+static inline void omap1_disable_lnk(int lch)
+{
+	u32 l;
+
+	l = dma_read(CLNK_CTRL(lch));
+
+	/* Disable interrupts */
+	dma_write(0, CICR(lch));
+	/* Set the STOP_LNK bit */
+	l |= 1 << 14;
+
+	dma_write(l, CLNK_CTRL(lch));
+	dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
+}
+
+static int omap1_dma_handle_ch(int ch)
+{
+	u32 csr;
+
+	if (enable_1510_mode && ch >= 6) {
+		csr = dma_chan[ch].saved_csr;
+		dma_chan[ch].saved_csr = 0;
+	} else
+		csr = dma_read(CSR(ch));
+	if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
+		dma_chan[ch + 6].saved_csr = csr >> 7;
+		csr &= 0x7f;
+	}
+	if ((csr & 0x3f) == 0)
+		return 0;
+	if (unlikely(dma_chan[ch].dev_id == -1)) {
+		printk(KERN_WARNING "Spurious interrupt from DMA channel "
+		       "%d (CSR %04x)\n", ch, csr);
+		return 0;
+	}
+	if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
+		printk(KERN_WARNING "DMA timeout with device %d\n",
+		       dma_chan[ch].dev_id);
+	if (unlikely(csr & OMAP_DMA_DROP_IRQ))
+		printk(KERN_WARNING "DMA synchronization event drop occurred "
+		       "with device %d\n", dma_chan[ch].dev_id);
+	if (likely(csr & OMAP_DMA_BLOCK_IRQ))
+		dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
+	if (likely(dma_chan[ch].callback != NULL))
+		dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
+
+	return 1;
+}
+
+static irqreturn_t irq_handler(int irq, void *dev_id)
+{
+	int ch = ((int) dev_id) - 1;
+	int handled = 0;
+
+	for (;;) {
+		int handled_now = 0;
+
+		handled_now += omap1_dma_handle_ch(ch);
+		if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
+			handled_now += omap1_dma_handle_ch(ch + 6);
+		if (!handled_now)
+			break;
+		handled += handled_now;
+	}
+
+	return handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
+{
+	if (!(d->dev_caps & ENABLE_1510_MODE)) {
+		u32 l;
+
+		l = dma_read(LCH_CTRL(lch));
+		l &= ~0x7;
+		l |= mode;
+		dma_write(l, LCH_CTRL(lch));
+	}
+}
+EXPORT_SYMBOL(omap_set_dma_channel_mode);
+
+void omap_set_dma_src_index(int lch, int eidx, int fidx)
+{
+	dma_write(eidx, CSEI(lch));
+	dma_write(fidx, CSFI(lch));
+}
+EXPORT_SYMBOL(omap_set_dma_src_index);
+
+void omap_set_dma_dest_index(int lch, int eidx, int fidx)
+{
+	dma_write(eidx, CDEI(lch));
+	dma_write(fidx, CDFI(lch));
+}
+EXPORT_SYMBOL(omap_set_dma_dest_index);
+
+void omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
+{
+	return;
+}
+EXPORT_SYMBOL(omap_dma_set_global_params);
 
 static int __init omap1_system_dma_init(void)
 {
 	struct platform_device *pdev;
 	struct omap_system_dma_plat_info *pdata;
-	struct omap_dma_dev_attr *d;
-	int ret;
+	int dma_irq, ret, ch;
+	char irq_name[4];
+	int irq_rel;
 
 	pdev = platform_device_alloc("system_dma", 0);
 	if (!pdev) {
@@ -159,7 +323,7 @@  static int __init omap1_system_dma_init(void)
 	if (ret) {
 		pr_err("%s: Unable to add resources for %s%d\n",
 			__func__, pdev->name, pdev->id);
-		goto exit_device_put;
+		goto exit_pdev;
 	}
 
 	pdata = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL);
@@ -167,7 +331,7 @@  static int __init omap1_system_dma_init(void)
 		dev_err(&pdev->dev, "%s: Unable to allocate pdata for %s\n",
 			__func__, pdev->name);
 		ret = -ENOMEM;
-		goto exit_device_put;
+		goto exit_pdev;
 	}
 
 	/* Errata handling for all omap1 plus processors */
@@ -184,6 +348,8 @@  static int __init omap1_system_dma_init(void)
 	if (cpu_is_omap15xx())
 		d->dev_caps = ENABLE_1510_MODE;
 
+	enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
+
 	d->dev_caps			|= SRC_PORT;
 	d->dev_caps			|= DST_PORT;
 	d->dev_caps			|= SRC_INDEX;
@@ -194,6 +360,19 @@  static int __init omap1_system_dma_init(void)
 
 	d->lch_count		= OMAP1_LOGICAL_DMA_CH_COUNT;
 
+	pdata->enable_channel_irq		= omap1_enable_channel_irq;
+	pdata->disable_channel_irq		= omap1_disable_channel_irq;
+	pdata->enable_lnk			= omap1_enable_lnk;
+	pdata->disable_lnk			= omap1_disable_lnk;
+	pdata->clear_lch_regs		= omap1_clear_lch_regs;
+	if (cpu_is_omap16xx()) {
+		pdata->get_gdma_dev		= omap1_get_gdma_dev;
+		pdata->set_gdma_dev		= omap1_set_gdma_dev;
+	}
+	pdata->enable_irq_lch		= NULL;
+	pdata->disable_irq_lch		= NULL;
+	pdata->set_dma_chain_ch		= NULL;
+
 	if (cpu_is_omap15xx())
 		d->chan_count = 9;
 	else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
@@ -203,36 +382,63 @@  static int __init omap1_system_dma_init(void)
 			d->chan_count = 9;
 	}
 
+	for (ch = 0; ch < d->chan_count; ch++) {
+		if (ch >= 6 && enable_1510_mode)
+			continue;
+
+		sprintf(&irq_name[0], "%d", ch);
+		dma_irq = platform_get_irq_byname(pdev, irq_name);
+		if (dma_irq < 0) {
+			dev_err(&pdev->dev, "%s:unable to get irq\n",
+								__func__);
+			ret = dma_irq;
+			goto exit_pdata;
+		}
+
+		ret = request_irq(dma_irq, irq_handler, 0, "DMA",
+							(void *) (ch + 1));
+		if (ret != 0)
+			goto exit_pdata;
+	}
+
 	pdata->omap_dma_base		= (void __iomem *)res[0].start;
 	dma_base			= pdata->omap_dma_base;
-
-	d->dma_chan = kzalloc(sizeof(struct omap_dma_lch) *
+	d->chan = kzalloc(sizeof(struct omap_dma_lch) *
 					(d->lch_count), GFP_KERNEL);
 
-	if (!d->dma_chan) {
+	if (!d->chan) {
 		dev_err(&pdev->dev, "%s: Memory allcation failed"
 					"for dma_chan!!!\n", __func__);
-		goto exit_release_pdata;
+		goto exit_pdata;
 	}
+	dma_chan = d->chan;
 
 	ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
 	if (ret) {
 		dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
 			__func__, pdev->name, pdev->id);
-		goto exit_release_dma_chan;
+		goto exit_pdata;
 	}
 	ret = platform_device_add(pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
 			__func__, pdev->name, pdev->id);
-		goto exit_release_dma_chan;
+		goto exit_dma_chan;
 	}
 
-exit_release_dma_chan:
-	kfree(d->dma_chan);
-exit_release_pdata:
+exit_dma_chan:
+	kfree(d->chan);
+exit_pdata:
+	printk(KERN_ERR "unable to request IRQ %d"
+				"for DMA (error %d)\n", dma_irq, ret);
+	if (enable_1510_mode)
+		ch = 6;
+	for (irq_rel = 0; irq_rel < ch; irq_rel++) {
+		dma_irq = platform_get_irq(pdev, irq_rel);
+		free_irq(dma_irq, (void *)(irq_rel + 1));
+	}
 	kfree(pdata);
-exit_device_put:
+exit_pdev:
 	platform_device_put(pdev);
 
 	return ret;
diff --git a/arch/arm/mach-omap2/dma.c b/arch/arm/mach-omap2/dma.c
index 8832bd1..6a5160d 100644
--- a/arch/arm/mach-omap2/dma.c
+++ b/arch/arm/mach-omap2/dma.c
@@ -50,9 +50,70 @@ 
 	__raw_writel((val), dma_base + OMAP_DMA4_##reg);		\
 })
 
+static struct omap_dma_global_context_registers {
+	u32 dma_irqenable_l0;
+	u32 dma_ocp_sysconfig;
+	u32 dma_gcr;
+} omap_dma_global_context;
+
+struct dma_link_info {
+	int *linked_dmach_q;
+	int no_of_lchs_linked;
+
+	int q_count;
+	int q_tail;
+	int q_head;
+
+	int chain_state;
+	int chain_mode;
+
+};
+
+static struct dma_link_info *dma_linked_lch;
+static struct omap_dma_lch *dma_chan;
+
+static int dma_chan_count;
+
+enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
+	DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
+};
+
+enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
+
+/* Chain handling macros */
+#define OMAP_DMA_CHAIN_QINIT(chain_id)					\
+	do {								\
+		dma_linked_lch[chain_id].q_head =			\
+		dma_linked_lch[chain_id].q_tail =			\
+		dma_linked_lch[chain_id].q_count = 0;			\
+	} while (0)
+#define OMAP_DMA_CHAIN_QFULL(chain_id)					\
+		(dma_linked_lch[chain_id].no_of_lchs_linked ==		\
+		dma_linked_lch[chain_id].q_count)
+#define OMAP_DMA_CHAIN_QLAST(chain_id)					\
+	do {								\
+		((dma_linked_lch[chain_id].no_of_lchs_linked-1) ==	\
+		dma_linked_lch[chain_id].q_count)			\
+	} while (0)
+#define OMAP_DMA_CHAIN_QEMPTY(chain_id)					\
+		(0 == dma_linked_lch[chain_id].q_count)
+#define __OMAP_DMA_CHAIN_INCQ(end)					\
+	((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
+#define OMAP_DMA_CHAIN_INCQHEAD(chain_id)				\
+	do {								\
+		__OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head);	\
+		dma_linked_lch[chain_id].q_count--;			\
+	} while (0)
+
+#define OMAP_DMA_CHAIN_INCQTAIL(chain_id)				\
+	do {								\
+		__OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail);	\
+		dma_linked_lch[chain_id].q_count++; \
+	} while (0)
+
 static struct omap_dma_dev_attr *d;
 static void __iomem *dma_base;
-static struct omap_system_dma_plat_info *omap2_pdata;
+static struct omap_system_dma_plat_info *p;
 static int dma_caps0_status;
 
 static struct omap_device_pm_latency omap2_dma_latency[] = {
@@ -63,6 +124,874 @@  static struct omap_device_pm_latency omap2_dma_latency[] = {
 	},
 };
 
+static inline void omap2_enable_irq_lch(int lch)
+{
+	u32 val;
+
+	val = dma_read(IRQENABLE_L0);
+	val |= 1 << lch;
+	dma_write(val, IRQENABLE_L0);
+}
+
+static inline void omap2_disable_irq_lch(int lch)
+{
+	u32 val;
+
+	val = dma_read(IRQENABLE_L0);
+	val &= ~(1 << lch);
+	dma_write(val, IRQENABLE_L0);
+}
+
+static inline void omap2_enable_channel_irq(int lch)
+{
+	/* Clear CSR */
+	dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
+
+	dma_write(dma_chan[lch].enabled_irqs, CICR(lch));
+}
+
+static void omap2_disable_channel_irq(int lch)
+{
+	dma_write(0, CICR(lch));
+}
+
+static inline void omap2_enable_lnk(int lch)
+{
+	u32 l;
+
+	l = dma_read(CLNK_CTRL(lch));
+
+	/* Set the ENABLE_LNK bits */
+	if (dma_chan[lch].next_lch != -1)
+		l = dma_chan[lch].next_lch | (1 << 15);
+
+	if (dma_chan[lch].next_linked_ch != -1)
+		l = dma_chan[lch].next_linked_ch | (1 << 15);
+
+	dma_write(l, CLNK_CTRL(lch));
+}
+
+static inline void omap2_disable_lnk(int lch)
+{
+	u32 l;
+
+	l = dma_read(CLNK_CTRL(lch));
+
+	omap2_disable_channel_irq(lch);
+	/* Clear the ENABLE_LNK bit */
+	l &= ~(1 << 15);
+
+	dma_write(l, CLNK_CTRL(lch));
+	dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
+}
+
+static void dma_ocpsysconfig_errata(u32 *sys_cf, bool flag)
+{
+	u32 l;
+
+	/*
+	 * DMA Errata:
+	 * Special programming model needed to disable DMA before end of block
+	 */
+	if (!flag) {
+		*sys_cf = dma_read(OCP_SYSCONFIG);
+		l = *sys_cf;
+		/* Middle mode reg set no Standby */
+		l &= ~((1 << 12)|(1 << 13));
+		dma_write(l, OCP_SYSCONFIG);
+	} else
+		/* put back old value */
+		dma_write(*sys_cf, OCP_SYSCONFIG);
+}
+
+void omap_dma_global_context_save(void)
+{
+	omap_dma_global_context.dma_irqenable_l0 =
+		dma_read(IRQENABLE_L0);
+	omap_dma_global_context.dma_ocp_sysconfig =
+		dma_read(OCP_SYSCONFIG);
+	omap_dma_global_context.dma_gcr = dma_read(GCR);
+}
+
+void omap_dma_global_context_restore(void)
+{
+	int ch;
+
+	dma_write(omap_dma_global_context.dma_gcr, GCR);
+	dma_write(omap_dma_global_context.dma_ocp_sysconfig,
+		OCP_SYSCONFIG);
+	dma_write(omap_dma_global_context.dma_irqenable_l0,
+		IRQENABLE_L0);
+
+	/*
+	 * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
+	 * after secure sram context save and restore. Hence we need to
+	 * manually clear those IRQs to avoid spurious interrupts. This
+	 * affects only secure devices.
+	 */
+	if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
+		dma_write(0x3 , IRQSTATUS_L0);
+
+	for (ch = 0; ch < dma_chan_count; ch++)
+		if (dma_chan[ch].dev_id != -1)
+			omap_clear_dma(ch);
+}
+
+/* Create chain of DMA channesls */
+static void create_dma_lch_chain(int lch_head, int lch_queue)
+{
+	u32 l;
+
+	/* Check if this is the first link in chain */
+	if (dma_chan[lch_head].next_linked_ch == -1) {
+		dma_chan[lch_head].next_linked_ch = lch_queue;
+		dma_chan[lch_head].prev_linked_ch = lch_queue;
+		dma_chan[lch_queue].next_linked_ch = lch_head;
+		dma_chan[lch_queue].prev_linked_ch = lch_head;
+	}
+
+	/* a link exists, link the new channel in circular chain */
+	else {
+		dma_chan[lch_queue].next_linked_ch =
+					dma_chan[lch_head].next_linked_ch;
+		dma_chan[lch_queue].prev_linked_ch = lch_head;
+		dma_chan[lch_head].next_linked_ch = lch_queue;
+		dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
+					lch_queue;
+	}
+
+	l = dma_read(CLNK_CTRL(lch_head));
+	l &= ~(0x1f);
+	l |= lch_queue;
+	dma_write(l, CLNK_CTRL(lch_head));
+
+	l = dma_read(CLNK_CTRL(lch_queue));
+	l &= ~(0x1f);
+	l |= (dma_chan[lch_queue].next_linked_ch);
+	dma_write(l, CLNK_CTRL(lch_queue));
+}
+
+static void set_dma_chain_ch(int free_ch)
+{
+	dma_chan[free_ch].chain_id       = -1;
+	dma_chan[free_ch].next_linked_ch = -1;
+}
+
+/**
+ * @brief omap_request_dma_chain : Request a chain of DMA channels
+ *
+ * @param dev_id - Device id using the dma channel
+ * @param dev_name - Device name
+ * @param callback - Call back function
+ * @chain_id -
+ * @no_of_chans - Number of channels requested
+ * @chain_mode - Dynamic or static chaining :	OMAP_DMA_STATIC_CHAIN
+ *						OMAP_DMA_DYNAMIC_CHAIN
+ * @params - Channel parameters
+ *
+ * @return -	Success : 0
+ *		Failure : -EINVAL/-ENOMEM
+ */
+int omap_request_dma_chain(int dev_id, const char *dev_name,
+			   void (*callback) (int lch, u16 ch_status,
+					     void *data),
+			   int *chain_id, int no_of_chans, int chain_mode,
+			   struct omap_dma_channel_params params)
+{
+	int *channels;
+	int i, err;
+
+	/* Is the chain mode valid ? */
+	if (chain_mode != OMAP_DMA_STATIC_CHAIN
+			&& chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
+		printk(KERN_ERR "Invalid chain mode requested\n");
+		return -EINVAL;
+	}
+
+	if (unlikely((no_of_chans < 1
+			|| no_of_chans > dma_chan_count))) {
+		printk(KERN_ERR "Invalid Number of channels requested\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Allocate a queue to maintain the status of the channels
+	 * in the chain
+	 */
+	channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
+	if (channels == NULL) {
+		printk(KERN_ERR "omap_dma: No memory for channel queue\n");
+		return -ENOMEM;
+	}
+
+	/* request and reserve DMA channels for the chain */
+	for (i = 0; i < no_of_chans; i++) {
+		err = omap_request_dma(dev_id, dev_name,
+					callback, NULL, &channels[i]);
+		if (err < 0) {
+			int j;
+			for (j = 0; j < i; j++)
+				omap_free_dma(channels[j]);
+			kfree(channels);
+			printk(KERN_ERR "omap_dma: Request failed %d\n", err);
+			return err;
+		}
+		dma_chan[channels[i]].prev_linked_ch = -1;
+		dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
+
+		/*
+		 * Allowing client drivers to set common parameters now,
+		 * so that later only relevant (src_start, dest_start
+		 * and element count) can be set
+		 */
+		omap_set_dma_params(channels[i], &params);
+	}
+
+	*chain_id = channels[0];
+	dma_linked_lch[*chain_id].linked_dmach_q = channels;
+	dma_linked_lch[*chain_id].chain_mode = chain_mode;
+	dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
+	dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
+
+	for (i = 0; i < no_of_chans; i++)
+		dma_chan[channels[i]].chain_id = *chain_id;
+
+	/* Reset the Queue pointers */
+	OMAP_DMA_CHAIN_QINIT(*chain_id);
+
+	/* Set up the chain */
+	if (no_of_chans == 1)
+		create_dma_lch_chain(channels[0], channels[0]);
+	else {
+		for (i = 0; i < (no_of_chans - 1); i++)
+			create_dma_lch_chain(channels[i], channels[i + 1]);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_request_dma_chain);
+
+/**
+ * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
+ * params after setting it. Dont do this while dma is running!!
+ *
+ * @param chain_id - Chained logical channel id.
+ * @param params
+ *
+ * @return -	Success : 0
+ *		Failure : -EINVAL
+ */
+int omap_modify_dma_chain_params(int chain_id,
+				struct omap_dma_channel_params params)
+{
+	int *channels;
+	u32 i;
+
+	/* Check for input params */
+	if (unlikely((chain_id < 0
+			|| chain_id >= dma_chan_count))) {
+		printk(KERN_ERR "Invalid chain id\n");
+		return -EINVAL;
+	}
+
+	/* Check if the chain exists */
+	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+		printk(KERN_ERR "Chain doesn't exists\n");
+		return -EINVAL;
+	}
+	channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+	for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
+		/*
+		 * Allowing client drivers to set common parameters now,
+		 * so that later only relevant (src_start, dest_start
+		 * and element count) can be set
+		 */
+		omap_set_dma_params(channels[i], &params);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_modify_dma_chain_params);
+
+/**
+ * @brief omap_free_dma_chain - Free all the logical channels in a chain.
+ *
+ * @param chain_id
+ *
+ * @return -	Success : 0
+ *		Failure : -EINVAL
+ */
+int omap_free_dma_chain(int chain_id)
+{
+	int *channels;
+	u32 i;
+
+	/* Check for input params */
+	if (unlikely((chain_id < 0 || chain_id >= dma_chan_count))) {
+		printk(KERN_ERR "Invalid chain id\n");
+		return -EINVAL;
+	}
+
+	/* Check if the chain exists */
+	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+		printk(KERN_ERR "Chain doesn't exists\n");
+		return -EINVAL;
+	}
+
+	channels = dma_linked_lch[chain_id].linked_dmach_q;
+	for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
+		dma_chan[channels[i]].next_linked_ch = -1;
+		dma_chan[channels[i]].prev_linked_ch = -1;
+		dma_chan[channels[i]].chain_id = -1;
+		dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
+		omap_free_dma(channels[i]);
+	}
+
+	kfree(channels);
+
+	dma_linked_lch[chain_id].linked_dmach_q = NULL;
+	dma_linked_lch[chain_id].chain_mode = -1;
+	dma_linked_lch[chain_id].chain_state = -1;
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_free_dma_chain);
+
+/**
+ * @brief omap_dma_chain_status - Check if the chain is in
+ * active / inactive state.
+ * @param chain_id
+ *
+ * @return -	Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
+ *		Failure : -EINVAL
+ */
+int omap_dma_chain_status(int chain_id)
+{
+	/* Check for input params */
+	if (unlikely((chain_id < 0 || chain_id >= dma_chan_count))) {
+		printk(KERN_ERR "Invalid chain id\n");
+		return -EINVAL;
+	}
+
+	/* Check if the chain exists */
+	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+		printk(KERN_ERR "Chain doesn't exists\n");
+		return -EINVAL;
+	}
+	pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
+			dma_linked_lch[chain_id].q_count);
+
+	if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
+		return OMAP_DMA_CHAIN_INACTIVE;
+
+	return OMAP_DMA_CHAIN_ACTIVE;
+}
+EXPORT_SYMBOL(omap_dma_chain_status);
+
+/**
+ * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
+ * set the params and start the transfer.
+ *
+ * @param chain_id
+ * @param src_start - buffer start address
+ * @param dest_start - Dest address
+ * @param elem_count
+ * @param frame_count
+ * @param callbk_data - channel callback parameter data.
+ *
+ * @return -	Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
+ *		Failure : -EINVAL
+ */
+int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
+			int elem_count, int frame_count, void *callbk_data)
+{
+	int *channels;
+	u32 l, lch;
+	int start_dma = 0;
+
+	/*
+	 * if buffer size is less than 1 then there is
+	 * no use of starting the chain
+	 */
+	if (elem_count < 1) {
+		printk(KERN_ERR "Invalid buffer size\n");
+		return -EINVAL;
+	}
+
+	/* Check for input params */
+	if (unlikely((chain_id < 0
+			|| chain_id >= dma_chan_count))) {
+		printk(KERN_ERR "Invalid chain id\n");
+		return -EINVAL;
+	}
+
+	/* Check if the chain exists */
+	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+		printk(KERN_ERR "Chain doesn't exist\n");
+		return -EINVAL;
+	}
+
+	/* Check if all the channels in chain are in use */
+	if (OMAP_DMA_CHAIN_QFULL(chain_id))
+		return -EBUSY;
+
+	/* Frame count may be negative in case of indexed transfers */
+	channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+	/* Get a free channel */
+	lch = channels[dma_linked_lch[chain_id].q_tail];
+
+	/* Store the callback data */
+	dma_chan[lch].data = callbk_data;
+
+	/* Increment the q_tail */
+	OMAP_DMA_CHAIN_INCQTAIL(chain_id);
+
+	/* Set the params to the free channel */
+	if (src_start != 0)
+		dma_write(src_start, CSSA(lch));
+	if (dest_start != 0)
+		dma_write(dest_start, CDSA(lch));
+
+	/* Write the buffer size */
+	dma_write(elem_count, CEN(lch));
+	dma_write(frame_count, CFN(lch));
+
+	/*
+	 * If the chain is dynamically linked,
+	 * then we may have to start the chain if its not active
+	 */
+	if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
+
+		/*
+		 * In Dynamic chain, if the chain is not started,
+		 * queue the channel
+		 */
+		if (dma_linked_lch[chain_id].chain_state ==
+						DMA_CHAIN_NOTSTARTED) {
+			/* Enable the link in previous channel */
+			if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
+								DMA_CH_QUEUED)
+				omap2_enable_lnk(dma_chan[lch].prev_linked_ch);
+			dma_chan[lch].state = DMA_CH_QUEUED;
+		}
+
+		/*
+		 * Chain is already started, make sure its active,
+		 * if not then start the chain
+		 */
+		else {
+			start_dma = 1;
+
+			if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
+							DMA_CH_STARTED) {
+				omap2_enable_lnk(dma_chan[lch].prev_linked_ch);
+				dma_chan[lch].state = DMA_CH_QUEUED;
+				start_dma = 0;
+				if (0 == ((1 << 7) & dma_read(
+					CCR(dma_chan[lch].prev_linked_ch)))) {
+					omap2_disable_lnk(dma_chan[lch].
+						    prev_linked_ch);
+					pr_debug("\n prev ch is stopped\n");
+					start_dma = 1;
+				}
+			}
+
+			else if (dma_chan[dma_chan[lch].prev_linked_ch].state
+							== DMA_CH_QUEUED) {
+				omap2_enable_lnk(dma_chan[lch].prev_linked_ch);
+				dma_chan[lch].state = DMA_CH_QUEUED;
+				start_dma = 0;
+			}
+			omap2_enable_channel_irq(lch);
+
+			l = dma_read(CCR(lch));
+
+			if ((0 == (l & (1 << 24))))
+				l &= ~(1 << 25);
+			else
+				l |= (1 << 25);
+			if (start_dma == 1) {
+				if (0 == (l & (1 << 7))) {
+					l |= (1 << 7);
+					dma_chan[lch].state = DMA_CH_STARTED;
+					pr_debug("starting %d\n", lch);
+					dma_write(l, CCR(lch));
+				} else
+					start_dma = 0;
+			} else {
+				if (0 == (l & (1 << 7)))
+					dma_write(l, CCR(lch));
+			}
+			dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_dma_chain_a_transfer);
+
+/**
+ * @brief omap_start_dma_chain_transfers - Start the chain
+ *
+ * @param chain_id
+ *
+ * @return -	Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
+ *		Failure : -EINVAL
+ */
+int omap_start_dma_chain_transfers(int chain_id)
+{
+	int *channels;
+	u32 l, i;
+
+	if (unlikely((chain_id < 0 || chain_id >= dma_chan_count))) {
+		printk(KERN_ERR "Invalid chain id\n");
+		return -EINVAL;
+	}
+
+	channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+	if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
+		printk(KERN_ERR "Chain is already started\n");
+		return -EBUSY;
+	}
+
+	if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
+		for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
+									i++) {
+			omap2_enable_lnk(channels[i]);
+			omap2_enable_channel_irq(channels[i]);
+		}
+	} else {
+		omap2_enable_channel_irq(channels[0]);
+	}
+
+	l = dma_read(CCR(channels[0]));
+	l |= (1 << 7);
+	dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
+	dma_chan[channels[0]].state = DMA_CH_STARTED;
+
+	if ((0 == (l & (1 << 24))))
+		l &= ~(1 << 25);
+	else
+		l |= (1 << 25);
+	dma_write(l, CCR(channels[0]));
+
+	dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_start_dma_chain_transfers);
+
+/**
+ * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
+ *
+ * @param chain_id
+ *
+ * @return -	Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
+ *		Failure : -EINVAL
+ */
+int omap_stop_dma_chain_transfers(int chain_id)
+{
+	int *channels;
+	u32 l, i;
+	u32 get_sysconfig;
+
+	/* Check for input params */
+	if (unlikely((chain_id < 0 || chain_id >= dma_chan_count))) {
+		printk(KERN_ERR "Invalid chain id\n");
+		return -EINVAL;
+	}
+
+	/* Check if the chain exists */
+	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+		printk(KERN_ERR "Chain doesn't exists\n");
+		return -EINVAL;
+	}
+	channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+	if (p->errata & DMA_SYSCONFIG_ERRATA)
+		dma_ocpsysconfig_errata(&get_sysconfig, false);
+
+	for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
+
+		/* Stop the Channel transmission */
+		l = dma_read(CCR(channels[i]));
+		l &= ~(1 << 7);
+		dma_write(l, CCR(channels[i]));
+
+		/* Disable the link in all the channels */
+		omap2_disable_lnk(channels[i]);
+		dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
+
+	}
+	dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
+
+	/* Reset the Queue pointers */
+	OMAP_DMA_CHAIN_QINIT(chain_id);
+
+	if (p->errata & DMA_SYSCONFIG_ERRATA)
+		dma_ocpsysconfig_errata(&get_sysconfig, true);
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
+
+/* Get the index of the ongoing DMA in chain */
+/**
+ * @brief omap_get_dma_chain_index - Get the element and frame index
+ * of the ongoing DMA in chain
+ *
+ * @param chain_id
+ * @param ei - Element index
+ * @param fi - Frame index
+ *
+ * @return -	Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
+ *		Failure : -EINVAL
+ */
+int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
+{
+	int lch;
+	int *channels;
+
+	/* Check for input params */
+	if (unlikely((chain_id < 0 || chain_id >= dma_chan_count))) {
+		printk(KERN_ERR "Invalid chain id\n");
+		return -EINVAL;
+	}
+
+	/* Check if the chain exists */
+	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+		printk(KERN_ERR "Chain doesn't exists\n");
+		return -EINVAL;
+	}
+	if ((!ei) || (!fi))
+		return -EINVAL;
+
+	channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+	/* Get the current channel */
+	lch = channels[dma_linked_lch[chain_id].q_head];
+
+	*ei = dma_read(CCEN(lch));
+	*fi = dma_read(CCFN(lch));
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_get_dma_chain_index);
+
+/**
+ * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
+ * ongoing DMA in chain
+ *
+ * @param chain_id
+ *
+ * @return -	Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
+ *		Failure : -EINVAL
+ */
+int omap_get_dma_chain_dst_pos(int chain_id)
+{
+	int lch;
+	int *channels;
+
+	/* Check for input params */
+	if (unlikely((chain_id < 0 || chain_id >= dma_chan_count))) {
+		printk(KERN_ERR "Invalid chain id\n");
+		return -EINVAL;
+	}
+
+	/* Check if the chain exists */
+	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+		printk(KERN_ERR "Chain doesn't exists\n");
+		return -EINVAL;
+	}
+
+	channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+	/* Get the current channel */
+	lch = channels[dma_linked_lch[chain_id].q_head];
+
+	return dma_read(CDAC(lch));
+}
+EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
+
+/**
+ * @brief omap_get_dma_chain_src_pos - Get the source position
+ * of the ongoing DMA in chain
+ * @param chain_id
+ *
+ * @return -	Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
+ *		Failure : -EINVAL
+ */
+int omap_get_dma_chain_src_pos(int chain_id)
+{
+	int lch;
+	int *channels;
+
+	/* Check for input params */
+	if (unlikely((chain_id < 0 || chain_id >= dma_chan_count))) {
+		printk(KERN_ERR "Invalid chain id\n");
+		return -EINVAL;
+	}
+
+	/* Check if the chain exists */
+	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+		printk(KERN_ERR "Chain doesn't exists\n");
+		return -EINVAL;
+	}
+
+	channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+	/* Get the current channel */
+	lch = channels[dma_linked_lch[chain_id].q_head];
+
+	return dma_read(CSAC(lch));
+}
+EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
+
+void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
+{
+	u32 csdp;
+
+	csdp = dma_read(CSDP(lch));
+	csdp &= ~(0x3 << 16);
+	csdp |= (mode << 16);
+	dma_write(csdp, CSDP(lch));
+}
+EXPORT_SYMBOL(omap_set_dma_write_mode);
+
+static int omap2_dma_handle_ch(int ch)
+{
+	u32 status = dma_read(CSR(ch));
+
+	if (!status) {
+		if (printk_ratelimit())
+			printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n",
+				ch);
+		dma_write(1 << ch, IRQSTATUS_L0);
+		return 0;
+	}
+	if (unlikely(dma_chan[ch].dev_id == -1)) {
+		if (printk_ratelimit())
+			printk(KERN_WARNING "IRQ %04x for non-allocated DMA"
+					"channel %d\n", status, ch);
+		return 0;
+	}
+	if (unlikely(status & OMAP_DMA_DROP_IRQ))
+		printk(KERN_INFO
+		       "DMA synchronization event drop occurred with device "
+		       "%d\n", dma_chan[ch].dev_id);
+	if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
+		printk(KERN_INFO "DMA transaction error with device %d\n",
+		       dma_chan[ch].dev_id);
+		if (cpu_class_is_omap2()) {
+			/*
+			 * Errata: sDMA Channel is not disabled
+			 * after a transaction error. So we explicitely
+			 * disable the channel
+			 */
+			u32 ccr;
+
+			ccr = dma_read(CCR(ch));
+			ccr &= ~OMAP_DMA_CCR_EN;
+			dma_write(ccr, CCR(ch));
+			dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
+		}
+	}
+	if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
+		printk(KERN_INFO "DMA secure error with device %d\n",
+		       dma_chan[ch].dev_id);
+	if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
+		printk(KERN_INFO "DMA misaligned error with device %d\n",
+		       dma_chan[ch].dev_id);
+
+	dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch));
+	dma_write(1 << ch, IRQSTATUS_L0);
+
+	/* If the ch is not chained then chain_id will be -1 */
+	if (dma_chan[ch].chain_id != -1) {
+		int chain_id = dma_chan[ch].chain_id;
+		dma_chan[ch].state = DMA_CH_NOTSTARTED;
+		if (dma_read(CLNK_CTRL(ch)) & (1 << 15))
+			dma_chan[dma_chan[ch].next_linked_ch].state =
+							DMA_CH_STARTED;
+		if (dma_linked_lch[chain_id].chain_mode ==
+						OMAP_DMA_DYNAMIC_CHAIN)
+			omap2_disable_lnk(ch);
+
+		if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
+			OMAP_DMA_CHAIN_INCQHEAD(chain_id);
+
+		status = dma_read(CSR(ch));
+	}
+
+	dma_write(status, CSR(ch));
+
+	if (likely(dma_chan[ch].callback != NULL))
+		dma_chan[ch].callback(ch, status, dma_chan[ch].data);
+
+	return 0;
+}
+
+/* STATUS register count is from 1-32 while our is 0-31 */
+static irqreturn_t irq_handler(int irq, void *dev_id)
+{
+	u32 val, enable_reg;
+	int i;
+
+	val = dma_read(IRQSTATUS_L0);
+	if (val == 0) {
+		if (printk_ratelimit())
+			printk(KERN_WARNING "Spurious DMA IRQ\n");
+		return IRQ_HANDLED;
+	}
+	enable_reg = dma_read(IRQENABLE_L0);
+	val &= enable_reg; /* Dispatch only relevant interrupts */
+	for (i = 0; i < dma_chan_count && val != 0; i++) {
+		if (val & 1)
+			omap2_dma_handle_ch(i);
+		val >>= 1;
+	}
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction omap24xx_dma_irq = {
+	.name = "DMA",
+	.handler = irq_handler,
+	.flags = IRQF_DISABLED
+};
+
+/**
+ * @brief omap_dma_set_global_params : Set global priority settings for dma
+ *
+ * @param arb_rate
+ * @param max_fifo_depth
+ * @param tparams - Number of threads to reserve:
+ * DMA_THREAD_RESERVE_NORM
+ * DMA_THREAD_RESERVE_ONET
+ * DMA_THREAD_RESERVE_TWOT
+ * DMA_THREAD_RESERVE_THREET
+ */
+void
+omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
+{
+	u32 reg;
+
+	if (max_fifo_depth == 0)
+		max_fifo_depth = 1;
+	if (arb_rate == 0)
+		arb_rate = 1;
+
+	reg = 0xff & max_fifo_depth;
+	reg |= (0x3 & tparams) << 12;
+	reg |= (arb_rate & 0xff) << 16;
+
+	dma_write(reg, GCR);
+}
+EXPORT_SYMBOL(omap_dma_set_global_params);
+
 /* One time initializations */
 static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *user)
 {
@@ -70,6 +999,7 @@  static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *user)
 	struct omap_system_dma_plat_info *pdata;
 	struct resource *mem;
 	char *name = "dma";
+	int dma_irq, ret;
 
 	pdata = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL);
 	if (!pdata) {
@@ -114,6 +1044,18 @@  static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *user)
 	/* Errata3.3: Applicable for all omap2 plus */
 	pdata->errata			|= OMAP3_3_ERRATUM;
 
+	p			= pdata;
+	p->enable_irq_lch	= omap2_enable_irq_lch;
+	p->disable_irq_lch	= omap2_disable_irq_lch;
+	p->enable_channel_irq	= omap2_enable_channel_irq;
+	p->disable_channel_irq	= omap2_disable_channel_irq;
+	p->enable_lnk		= omap2_enable_lnk;
+	p->disable_lnk		= omap2_disable_lnk;
+	p->set_dma_chain_ch	= set_dma_chain_ch;
+	p->clear_lch_regs	= NULL;
+	p->get_gdma_dev		= NULL;
+	p->set_gdma_dev		= NULL;
+
 	od = omap_device_build(name, 0, oh, pdata, sizeof(*pdata),
 			omap2_dma_latency, ARRAY_SIZE(omap2_dma_latency), 0);
 
@@ -136,11 +1078,19 @@  static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *user)
 		return -ENOMEM;
 	}
 
+	dma_irq = platform_get_irq_byname(&od->pdev, "0");
+	ret = setup_irq(dma_irq, &omap24xx_dma_irq);
+	if (ret) {
+		dev_err(&od->pdev.dev, "%s:irq handler setup fail\n", __func__);
+		return -EINVAL;
+	}
+
 	/* Get DMA device attributes from hwmod data base */
 	d = (struct omap_dma_dev_attr *)oh->dev_attr;
 
 	/* OMAP2 Plus: physical and logical channel count is same */
-	d->chan_count = d->lch_count;
+	d->chan_count  = d->lch_count;
+	dma_chan_count = d->chan_count;
 
 	d->chan = kzalloc(sizeof(struct omap_dma_lch) *
 					(d->lch_count), GFP_KERNEL);
@@ -150,7 +1100,15 @@  static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *user)
 		return -ENOMEM;
 	}
 
-	omap2_pdata		= pdata;
+	dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
+						dma_chan_count, GFP_KERNEL);
+	if (!dma_linked_lch) {
+		kfree(d->chan);
+		return -ENOMEM;
+	}
+
+	dma_chan		= d->chan;
+
 	dma_caps0_status	= dma_read(CAPS_0);
 
 	return 0;
diff --git a/arch/arm/mach-omap2/include/mach/dma.h b/arch/arm/mach-omap2/include/mach/dma.h
index 22f4b41..f3e21d5 100644
--- a/arch/arm/mach-omap2/include/mach/dma.h
+++ b/arch/arm/mach-omap2/include/mach/dma.h
@@ -160,4 +160,25 @@  struct omap_dma_lch {
 	int status;
 };
 
+/* Chaining APIs */
+extern int omap_request_dma_chain(int dev_id, const char *dev_name,
+				  void (*callback) (int lch, u16 ch_status,
+						    void *data),
+				  int *chain_id, int no_of_chans,
+				  int chain_mode,
+				  struct omap_dma_channel_params params);
+extern int omap_free_dma_chain(int chain_id);
+extern int omap_dma_chain_a_transfer(int chain_id, int src_start,
+				     int dest_start, int elem_count,
+				     int frame_count, void *callbk_data);
+extern int omap_start_dma_chain_transfers(int chain_id);
+extern int omap_stop_dma_chain_transfers(int chain_id);
+extern int omap_get_dma_chain_index(int chain_id, int *ei, int *fi);
+extern int omap_get_dma_chain_dst_pos(int chain_id);
+extern int omap_get_dma_chain_src_pos(int chain_id);
+
+extern int omap_modify_dma_chain_params(int chain_id,
+					struct omap_dma_channel_params params);
+extern int omap_dma_chain_status(int chain_id);
+
 #endif /* __ASM_ARCH_OMAP2_DMA_H */
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 409586a..3934b98 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -43,98 +43,20 @@ 
 #include <plat/omap_device.h>
 #include <plat/tc.h>
 
-
-#undef DEBUG
-
-#ifndef CONFIG_ARCH_OMAP1
-enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
-	DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
-};
-
-enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
-#endif
-
-#define OMAP_DMA_ACTIVE			0x01
-#define OMAP2_DMA_CSR_CLEAR_MASK	0xffe
-
-#define OMAP_FUNC_MUX_ARM_BASE		(0xfffe1000 + 0xec)
-
 static int enable_1510_mode;
-
-static struct omap_dma_global_context_registers {
-	u32 dma_irqenable_l0;
-	u32 dma_ocp_sysconfig;
-	u32 dma_gcr;
-} omap_dma_global_context;
-
-struct dma_link_info {
-	int *linked_dmach_q;
-	int no_of_lchs_linked;
-
-	int q_count;
-	int q_tail;
-	int q_head;
-
-	int chain_state;
-	int chain_mode;
-
-};
-
-static struct dma_link_info *dma_linked_lch;
-static struct platform_device *ddev;
-
-#ifndef CONFIG_ARCH_OMAP1
-
-/* Chain handling macros */
-#define OMAP_DMA_CHAIN_QINIT(chain_id)					\
-	do {								\
-		dma_linked_lch[chain_id].q_head =			\
-		dma_linked_lch[chain_id].q_tail =			\
-		dma_linked_lch[chain_id].q_count = 0;			\
-	} while (0)
-#define OMAP_DMA_CHAIN_QFULL(chain_id)					\
-		(dma_linked_lch[chain_id].no_of_lchs_linked ==		\
-		dma_linked_lch[chain_id].q_count)
-#define OMAP_DMA_CHAIN_QLAST(chain_id)					\
-	do {								\
-		((dma_linked_lch[chain_id].no_of_lchs_linked-1) ==	\
-		dma_linked_lch[chain_id].q_count)			\
-	} while (0)
-#define OMAP_DMA_CHAIN_QEMPTY(chain_id)					\
-		(0 == dma_linked_lch[chain_id].q_count)
-#define __OMAP_DMA_CHAIN_INCQ(end)					\
-	((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
-#define OMAP_DMA_CHAIN_INCQHEAD(chain_id)				\
-	do {								\
-		__OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head);	\
-		dma_linked_lch[chain_id].q_count--;			\
-	} while (0)
-
-#define OMAP_DMA_CHAIN_INCQTAIL(chain_id)				\
-	do {								\
-		__OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail);	\
-		dma_linked_lch[chain_id].q_count++; \
-	} while (0)
-#endif
-
 static int dma_lch_count;
 static int dma_chan_count;
 static int omap_dma_reserve_channels;
 
 static spinlock_t dma_chan_lock;
-static struct omap_dma_lch *dma_chan;
 
 static void __iomem *omap_dma_base;
+
+static struct platform_device *ddev;
+static struct omap_dma_lch *dma_chan;
 static struct omap_system_dma_plat_info *p;
 static struct omap_dma_dev_attr *d;
 
-static inline void disable_lnk(int lch);
-static void omap_disable_channel_irq(int lch);
-static inline void omap_enable_channel_irq(int lch);
-
-#define REVISIT_24XX()		printk(KERN_ERR "FIXME: no %s on 24xx\n", \
-						__func__);
-
 #define dma_read(reg)							\
 ({									\
 	u32 __val;							\
@@ -153,75 +75,12 @@  static inline void omap_enable_channel_irq(int lch);
 		__raw_writel((val), omap_dma_base + OMAP_DMA4_##reg);	\
 })
 
-#ifdef CONFIG_ARCH_OMAP15XX
-/* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
-int omap_dma_in_1510_mode(void)
-{
-	return enable_1510_mode;
-}
-#else
-#define omap_dma_in_1510_mode()		0
-#endif
-
-#ifdef CONFIG_ARCH_OMAP1
-static inline int get_gdma_dev(int req)
-{
-	u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
-	int shift = ((req - 1) % 5) * 6;
-
-	return ((omap_readl(reg) >> shift) & 0x3f) + 1;
-}
-
-static inline void set_gdma_dev(int req, int dev)
-{
-	u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
-	int shift = ((req - 1) % 5) * 6;
-	u32 l;
-
-	l = omap_readl(reg);
-	l &= ~(0x3f << shift);
-	l |= (dev - 1) << shift;
-	omap_writel(l, reg);
-}
-#else
-#define set_gdma_dev(req, dev)	do {} while (0)
-#endif
-
-static void dma_ocpsysconfig_errata(u32 *sys_cf, bool flag)
-{
-	u32 l;
-
-	/*
-	 * DMA Errata:
-	 * Special programming model needed to disable DMA before end of block
-	 */
-	if (!flag) {
-		*sys_cf = dma_read(OCP_SYSCONFIG);
-		l = *sys_cf;
-		/* Middle mode reg set no Standby */
-		l &= ~((1 << 12)|(1 << 13));
-		dma_write(l, OCP_SYSCONFIG);
-	} else
-		/* put back old value */
-		dma_write(*sys_cf, OCP_SYSCONFIG);
-}
-
-/* Omap1 only */
-static void clear_lch_regs(int lch)
-{
-	int i;
-	void __iomem *lch_base = omap_dma_base + OMAP1_DMA_CH_BASE(lch);
-
-	for (i = 0; i < 0x2c; i += 2)
-		__raw_writew(0, lch_base + i);
-}
-
 void omap_set_dma_priority(int lch, int dst_port, int priority)
 {
 	unsigned long reg;
 	u32 l;
 
-	if (cpu_class_is_omap1()) {
+	if (d->dev_caps & IS_WORD_16) {
 		switch (dst_port) {
 		case OMAP_DMA_PORT_OCP_T1:	/* FFFECC00 */
 			reg = OMAP_TC_OCPT1_PRIOR;
@@ -243,9 +102,7 @@  void omap_set_dma_priority(int lch, int dst_port, int priority)
 		l &= ~(0xf << 8);
 		l |= (priority & 0xf) << 8;
 		omap_writel(l, reg);
-	}
-
-	if (cpu_class_is_omap2()) {
+	} else {
 		u32 ccr;
 
 		ccr = dma_read(CCR(lch));
@@ -269,7 +126,7 @@  void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 	l |= data_type;
 	dma_write(l, CSDP(lch));
 
-	if (cpu_class_is_omap1()) {
+	if (d->dev_caps & IS_WORD_16) {
 		u16 ccr;
 
 		ccr = dma_read(CCR(lch));
@@ -283,15 +140,13 @@  void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 		if (sync_mode == OMAP_DMA_SYNC_BLOCK)
 			ccr |= 1 << 2;
 		dma_write(ccr, CCR2(lch));
-	}
-
-	if (cpu_class_is_omap2() && dma_trigger) {
+	} else if (dma_trigger) {
 		u32 val;
 
 		val = dma_read(CCR(lch));
 
 		/* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
-		val &= ~((1 << 23) | (3 << 19) | 0x1f);
+		val &= ~((3 << 19) | 0x1f);
 		val |= (dma_trigger & ~0x1f) << 14;
 		val |= dma_trigger & 0x1f;
 
@@ -305,14 +160,11 @@  void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 		else
 			val &= ~(1 << 18);
 
-		if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
-			val &= ~(1 << 24);	/* dest synch */
-			val |= (1 << 23);	/* Prefetch */
-		} else if (src_or_dst_synch) {
+		if (src_or_dst_synch)
 			val |= 1 << 24;		/* source synch */
-		} else {
+		else
 			val &= ~(1 << 24);	/* dest synch */
-		}
+
 		dma_write(val, CCR(lch));
 	}
 
@@ -323,9 +175,9 @@  EXPORT_SYMBOL(omap_set_dma_transfer_params);
 
 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
 {
-	BUG_ON(omap_dma_in_1510_mode());
+	BUG_ON(enable_1510_mode);
 
-	if (cpu_class_is_omap1()) {
+	if (d->dev_caps & IS_WORD_16) {
 		u16 w;
 
 		w = dma_read(CCR2(lch));
@@ -354,9 +206,7 @@  void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
 			w |= 1;		/* Channel type G */
 		}
 		dma_write(w, LCH_CTRL(lch));
-	}
-
-	if (cpu_class_is_omap2()) {
+	} else {
 		u32 val;
 
 		val = dma_read(CCR(lch));
@@ -382,32 +232,6 @@  void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
 }
 EXPORT_SYMBOL(omap_set_dma_color_mode);
 
-void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
-{
-	if (cpu_class_is_omap2()) {
-		u32 csdp;
-
-		csdp = dma_read(CSDP(lch));
-		csdp &= ~(0x3 << 16);
-		csdp |= (mode << 16);
-		dma_write(csdp, CSDP(lch));
-	}
-}
-EXPORT_SYMBOL(omap_set_dma_write_mode);
-
-void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
-{
-	if (cpu_class_is_omap1() && !cpu_is_omap15xx()) {
-		u32 l;
-
-		l = dma_read(LCH_CTRL(lch));
-		l &= ~0x7;
-		l |= mode;
-		dma_write(l, LCH_CTRL(lch));
-	}
-}
-EXPORT_SYMBOL(omap_set_dma_channel_mode);
-
 /* Note that src_port is only for omap1 */
 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 			     unsigned long src_start,
@@ -415,7 +239,7 @@  void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 {
 	u32 l;
 
-	if (cpu_class_is_omap1()) {
+	if (d->dev_caps & SRC_PORT) {
 		u16 w;
 
 		w = dma_read(CSDP(lch));
@@ -429,12 +253,10 @@  void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 	l |= src_amode << 12;
 	dma_write(l, CCR(lch));
 
-	if (cpu_class_is_omap1()) {
+	if (d->dev_caps & IS_WORD_16) {
 		dma_write(src_start >> 16, CSSA_U(lch));
 		dma_write((u16)src_start, CSSA_L(lch));
-	}
-
-	if (cpu_class_is_omap2())
+	} else
 		dma_write(src_start, CSSA(lch));
 
 	dma_write(src_ei, CSEI(lch));
@@ -461,16 +283,6 @@  void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
 }
 EXPORT_SYMBOL(omap_set_dma_params);
 
-void omap_set_dma_src_index(int lch, int eidx, int fidx)
-{
-	if (cpu_class_is_omap2())
-		return;
-
-	dma_write(eidx, CSEI(lch));
-	dma_write(fidx, CSFI(lch));
-}
-EXPORT_SYMBOL(omap_set_dma_src_index);
-
 void omap_set_dma_src_data_pack(int lch, int enable)
 {
 	u32 l;
@@ -495,13 +307,13 @@  void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 	case OMAP_DMA_DATA_BURST_DIS:
 		break;
 	case OMAP_DMA_DATA_BURST_4:
-		if (cpu_class_is_omap2())
-			burst = 0x1;
-		else
+		if (d->dev_caps & IS_BURST_ONLY4)
 			burst = 0x2;
+		else
+			burst = 0x1;
 		break;
 	case OMAP_DMA_DATA_BURST_8:
-		if (cpu_class_is_omap2()) {
+		if (!(d->dev_caps & IS_BURST_ONLY4)) {
 			burst = 0x2;
 			break;
 		}
@@ -511,7 +323,7 @@  void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 		 * fall through
 		 */
 	case OMAP_DMA_DATA_BURST_16:
-		if (cpu_class_is_omap2()) {
+		if (!(d->dev_caps & IS_BURST_ONLY4)) {
 			burst = 0x3;
 			break;
 		}
@@ -535,7 +347,7 @@  void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 {
 	u32 l;
 
-	if (cpu_class_is_omap1()) {
+	if (d->dev_caps & DST_PORT) {
 		l = dma_read(CSDP(lch));
 		l &= ~(0x1f << 9);
 		l |= dest_port << 9;
@@ -547,12 +359,10 @@  void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 	l |= dest_amode << 14;
 	dma_write(l, CCR(lch));
 
-	if (cpu_class_is_omap1()) {
+	if (d->dev_caps & IS_WORD_16) {
 		dma_write(dest_start >> 16, CDSA_U(lch));
 		dma_write(dest_start, CDSA_L(lch));
-	}
-
-	if (cpu_class_is_omap2())
+	} else
 		dma_write(dest_start, CDSA(lch));
 
 	dma_write(dst_ei, CDEI(lch));
@@ -560,16 +370,6 @@  void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 }
 EXPORT_SYMBOL(omap_set_dma_dest_params);
 
-void omap_set_dma_dest_index(int lch, int eidx, int fidx)
-{
-	if (cpu_class_is_omap2())
-		return;
-
-	dma_write(eidx, CDEI(lch));
-	dma_write(fidx, CDFI(lch));
-}
-EXPORT_SYMBOL(omap_set_dma_dest_index);
-
 void omap_set_dma_dest_data_pack(int lch, int enable)
 {
 	u32 l;
@@ -594,19 +394,19 @@  void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 	case OMAP_DMA_DATA_BURST_DIS:
 		break;
 	case OMAP_DMA_DATA_BURST_4:
-		if (cpu_class_is_omap2())
-			burst = 0x1;
-		else
+		if (d->dev_caps & IS_BURST_ONLY4)
 			burst = 0x2;
+		else
+			burst = 0x1;
 		break;
 	case OMAP_DMA_DATA_BURST_8:
-		if (cpu_class_is_omap2())
-			burst = 0x2;
-		else
+		if (d->dev_caps & IS_BURST_ONLY4)
 			burst = 0x3;
+		else
+			burst = 0x2;
 		break;
 	case OMAP_DMA_DATA_BURST_16:
-		if (cpu_class_is_omap2()) {
+		if (!(d->dev_caps & IS_BURST_ONLY4)) {
 			burst = 0x3;
 			break;
 		}
@@ -624,26 +424,6 @@  void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 }
 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
 
-static inline void omap_enable_channel_irq(int lch)
-{
-	u32 status;
-
-	/* Clear CSR */
-	if (cpu_class_is_omap1())
-		status = dma_read(CSR(lch));
-	else if (cpu_class_is_omap2())
-		dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
-
-	/* Enable some nice interrupts. */
-	dma_write(dma_chan[lch].enabled_irqs, CICR(lch));
-}
-
-static void omap_disable_channel_irq(int lch)
-{
-	if (cpu_class_is_omap2())
-		dma_write(0, CICR(lch));
-}
-
 void omap_enable_dma_irq(int lch, u16 bits)
 {
 	dma_chan[lch].enabled_irqs |= bits;
@@ -656,81 +436,6 @@  void omap_disable_dma_irq(int lch, u16 bits)
 }
 EXPORT_SYMBOL(omap_disable_dma_irq);
 
-static inline void enable_lnk(int lch)
-{
-	u32 l;
-
-	l = dma_read(CLNK_CTRL(lch));
-
-	if (cpu_class_is_omap1())
-		l &= ~(1 << 14);
-
-	/* Set the ENABLE_LNK bits */
-	if (dma_chan[lch].next_lch != -1)
-		l = dma_chan[lch].next_lch | (1 << 15);
-
-#ifndef CONFIG_ARCH_OMAP1
-	if (cpu_class_is_omap2())
-		if (dma_chan[lch].next_linked_ch != -1)
-			l = dma_chan[lch].next_linked_ch | (1 << 15);
-#endif
-
-	dma_write(l, CLNK_CTRL(lch));
-}
-
-static inline void disable_lnk(int lch)
-{
-	u32 l;
-
-	l = dma_read(CLNK_CTRL(lch));
-
-	/* Disable interrupts */
-	if (cpu_class_is_omap1()) {
-		dma_write(0, CICR(lch));
-		/* Set the STOP_LNK bit */
-		l |= 1 << 14;
-	}
-
-	if (cpu_class_is_omap2()) {
-		omap_disable_channel_irq(lch);
-		/* Clear the ENABLE_LNK bit */
-		l &= ~(1 << 15);
-	}
-
-	dma_write(l, CLNK_CTRL(lch));
-	dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
-}
-
-static inline void omap2_enable_irq_lch(int lch)
-{
-	u32 val;
-	unsigned long flags;
-
-	if (!cpu_class_is_omap2())
-		return;
-
-	spin_lock_irqsave(&dma_chan_lock, flags);
-	val = dma_read(IRQENABLE_L0);
-	val |= 1 << lch;
-	dma_write(val, IRQENABLE_L0);
-	spin_unlock_irqrestore(&dma_chan_lock, flags);
-}
-
-static inline void omap2_disable_irq_lch(int lch)
-{
-	u32 val;
-	unsigned long flags;
-
-	if (!cpu_class_is_omap2())
-		return;
-
-	spin_lock_irqsave(&dma_chan_lock, flags);
-	val = dma_read(IRQENABLE_L0);
-	val &= ~(1 << lch);
-	dma_write(val, IRQENABLE_L0);
-	spin_unlock_irqrestore(&dma_chan_lock, flags);
-}
-
 int omap_request_dma(int dev_id, const char *dev_name,
 		     void (*callback)(int lch, u16 ch_status, void *data),
 		     void *data, int *dma_ch_out)
@@ -754,14 +459,12 @@  int omap_request_dma(int dev_id, const char *dev_name,
 	chan = dma_chan + free_ch;
 	chan->dev_id = dev_id;
 
-	pm_runtime_get_sync(&ddev->dev);
-
-	if (cpu_class_is_omap1())
-		clear_lch_regs(free_ch);
-
-	if (cpu_class_is_omap2())
+	if (p->clear_lch_regs)
+		p->clear_lch_regs(free_ch);
+	else
 		omap_clear_dma(free_ch);
 
+	pm_runtime_get_sync(&ddev->dev);
 	spin_unlock_irqrestore(&dma_chan_lock, flags);
 
 	chan->dev_name = dev_name;
@@ -769,25 +472,21 @@  int omap_request_dma(int dev_id, const char *dev_name,
 	chan->data = data;
 	chan->flags = 0;
 
-#ifndef CONFIG_ARCH_OMAP1
-	if (cpu_class_is_omap2()) {
-		chan->chain_id = -1;
-		chan->next_linked_ch = -1;
-	}
-#endif
+	if (p->set_dma_chain_ch)
+		p->set_dma_chain_ch(free_ch);
 
 	chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 
-	if (cpu_class_is_omap1())
+	if (d->dev_caps & IS_WORD_16)
 		chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
-	else if (cpu_class_is_omap2())
+	else
 		chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
-			OMAP2_DMA_TRANS_ERR_IRQ;
+						OMAP2_DMA_TRANS_ERR_IRQ;
 
-	if (cpu_is_omap16xx()) {
+	if (p->set_gdma_dev) {
 		/* If the sync device is set, configure it dynamically. */
 		if (dev_id != 0) {
-			set_gdma_dev(free_ch + 1, dev_id);
+			p->set_gdma_dev(free_ch + 1, dev_id);
 			dev_id = free_ch + 1;
 		}
 		/*
@@ -795,13 +494,15 @@  int omap_request_dma(int dev_id, const char *dev_name,
 		 * id.
 		 */
 		dma_write(dev_id | (1 << 10), CCR(free_ch));
-	} else if (cpu_is_omap7xx() || cpu_is_omap15xx()) {
+	} else if (d->dev_caps & IS_WORD_16)
 		dma_write(dev_id, CCR(free_ch));
-	}
 
-	if (cpu_class_is_omap2()) {
-		omap2_enable_irq_lch(free_ch);
-		omap_enable_channel_irq(free_ch);
+	if (p->enable_irq_lch) {
+		spin_lock_irqsave(&dma_chan_lock, flags);
+		p->enable_irq_lch(free_ch);
+		spin_unlock_irqrestore(&dma_chan_lock, flags);
+		if (p->enable_channel_irq)
+			p->enable_channel_irq(free_ch);
 		/* Clear the CSR register and IRQ status register */
 		dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(free_ch));
 		dma_write(1 << free_ch, IRQSTATUS_L0);
@@ -823,15 +524,18 @@  void omap_free_dma(int lch)
 		return;
 	}
 
-	if (cpu_class_is_omap1()) {
+	if (d->dev_caps & IS_WORD_16) {
 		/* Disable all DMA interrupts for the channel. */
 		dma_write(0, CICR(lch));
 		/* Make sure the DMA transfer is stopped. */
 		dma_write(0, CCR(lch));
 	}
 
-	if (cpu_class_is_omap2()) {
-		omap2_disable_irq_lch(lch);
+	if (p->disable_irq_lch) {
+		unsigned long flags;
+		spin_lock_irqsave(&dma_chan_lock, flags);
+		p->disable_irq_lch(lch);
+		spin_unlock_irqrestore(&dma_chan_lock, flags);
 
 		/* Clear the CSR register and IRQ status register */
 		dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
@@ -857,39 +561,6 @@  void omap_free_dma(int lch)
 EXPORT_SYMBOL(omap_free_dma);
 
 /**
- * @brief omap_dma_set_global_params : Set global priority settings for dma
- *
- * @param arb_rate
- * @param max_fifo_depth
- * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
- * 						   DMA_THREAD_RESERVE_ONET
- * 						   DMA_THREAD_RESERVE_TWOT
- * 						   DMA_THREAD_RESERVE_THREET
- */
-void
-omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
-{
-	u32 reg;
-
-	if (!cpu_class_is_omap2()) {
-		printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
-		return;
-	}
-
-	if (max_fifo_depth == 0)
-		max_fifo_depth = 1;
-	if (arb_rate == 0)
-		arb_rate = 1;
-
-	reg = 0xff & max_fifo_depth;
-	reg |= (0x3 & tparams) << 12;
-	reg |= (arb_rate & 0xff) << 16;
-
-	dma_write(reg, GCR);
-}
-EXPORT_SYMBOL(omap_dma_set_global_params);
-
-/**
  * @brief omap_dma_set_prio_lch : Set channel wise priority settings
  *
  * @param lch
@@ -910,7 +581,7 @@  omap_dma_set_prio_lch(int lch, unsigned char read_prio,
 	}
 	l = dma_read(CCR(lch));
 	l &= ~((1 << 6) | (1 << 26));
-	if (cpu_is_omap2430() || cpu_is_omap34xx() ||  cpu_is_omap44xx())
+	if (d->dev_caps & IS_RW_PRIORIY)
 		l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
 	else
 		l |= ((read_prio & 0x1) << 6);
@@ -931,7 +602,7 @@  void omap_clear_dma(int lch)
 
 	local_irq_save(flags);
 
-	if (cpu_class_is_omap1()) {
+	if (d->dev_caps & IS_WORD_16) {
 		u32 l;
 
 		l = dma_read(CCR(lch));
@@ -940,9 +611,7 @@  void omap_clear_dma(int lch)
 
 		/* Clear pending interrupts */
 		l = dma_read(CSR(lch));
-	}
-
-	if (cpu_class_is_omap2()) {
+	} else {
 		int i;
 		void __iomem *lch_base = omap_dma_base + OMAP_DMA4_CH_BASE(lch);
 		for (i = 0; i < 0x44; i += 4)
@@ -961,18 +630,19 @@  void omap_start_dma(int lch)
 	 * The CPC/CDAC register needs to be initialized to zero
 	 * before starting dma transfer.
 	 */
-	if (cpu_is_omap15xx())
+	if (d->dev_caps & IS_WORD_16)
 		dma_write(0, CPC(lch));
 	else
 		dma_write(0, CDAC(lch));
 
-	if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
+	if (!enable_1510_mode && dma_chan[lch].next_lch != -1) {
 		int next_lch, cur_lch;
 		char dma_chan_link_map[dma_chan_count];
 
 		dma_chan_link_map[lch] = 1;
 		/* Set the link register of the first channel */
-		enable_lnk(lch);
+		if (p->enable_lnk)
+			p->enable_lnk(lch);
 
 		memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 		cur_lch = dma_chan[lch].next_lch;
@@ -985,8 +655,10 @@  void omap_start_dma(int lch)
 			/* Mark the current channel */
 			dma_chan_link_map[cur_lch] = 1;
 
-			enable_lnk(cur_lch);
-			omap_enable_channel_irq(cur_lch);
+			if (p->enable_lnk)
+				p->enable_lnk(cur_lch);
+			if (p->enable_channel_irq)
+				p->enable_channel_irq(cur_lch);
 
 			cur_lch = next_lch;
 		} while (next_lch != -1);
@@ -995,7 +667,8 @@  void omap_start_dma(int lch)
 	if (p->errata & DMA_CHAINING_ERRATA)
 		dma_write(lch, CLNK_CTRL(lch));
 
-	omap_enable_channel_irq(lch);
+	if (p->enable_channel_irq)
+		p->enable_channel_irq(lch);
 
 	l = dma_read(CCR(lch));
 
@@ -1014,14 +687,14 @@  void omap_stop_dma(int lch)
 	u32 l;
 
 	/* Disable all interrupts on the channel */
-	if (cpu_class_is_omap1())
+	if (d->dev_caps & IS_WORD_16)
 		dma_write(0, CICR(lch));
 
 	l = dma_read(CCR(lch));
 	l &= ~OMAP_DMA_CCR_EN;
 	dma_write(l, CCR(lch));
 
-	if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
+	if (!(enable_1510_mode && (dma_chan[lch].next_lch != -1))) {
 		int next_lch, cur_lch = lch;
 		char dma_chan_link_map[dma_chan_count];
 
@@ -1033,7 +706,8 @@  void omap_stop_dma(int lch)
 			/* Mark the current channel */
 			dma_chan_link_map[cur_lch] = 1;
 
-			disable_lnk(cur_lch);
+			if (p->disable_lnk)
+				p->disable_lnk(cur_lch);
 
 			next_lch = dma_chan[cur_lch].next_lch;
 			cur_lch = next_lch;
@@ -1083,19 +757,16 @@  dma_addr_t omap_get_dma_src_pos(int lch)
 {
 	dma_addr_t offset = 0;
 
-	if (cpu_is_omap15xx())
+	if (d->dev_caps & ENABLE_1510_MODE)
 		offset = dma_read(CPC(lch));
 	else
 		offset = dma_read(CSAC(lch));
 
-	/*
-	 * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
-	 * read before the DMA controller finished disabling the channel.
-	 */
-	if (!cpu_is_omap15xx() && offset == 0)
+	if ((p->errata & OMAP3_3_ERRATUM) && !(enable_1510_mode)
+				&& (offset == 0))
 		offset = dma_read(CSAC(lch));
 
-	if (cpu_class_is_omap1())
+	if (d->dev_caps & IS_WORD_16)
 		offset |= (dma_read(CSSA_U(lch)) << 16);
 
 	return offset;
@@ -1114,19 +785,16 @@  dma_addr_t omap_get_dma_dst_pos(int lch)
 {
 	dma_addr_t offset = 0;
 
-	if (cpu_is_omap15xx())
+	if (d->dev_caps & ENABLE_1510_MODE)
 		offset = dma_read(CPC(lch));
 	else
 		offset = dma_read(CDAC(lch));
 
-	/*
-	 * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
-	 * read before the DMA controller finished disabling the channel.
-	 */
-	if (!cpu_is_omap15xx() && offset == 0)
+	if ((p->errata & OMAP3_3_ERRATUM) && !(enable_1510_mode)
+				&& (offset == 0))
 		offset = dma_read(CDAC(lch));
 
-	if (cpu_class_is_omap1())
+	if (d->dev_caps & IS_WORD_16)
 		offset |= (dma_read(CDSA_U(lch)) << 16);
 
 	return offset;
@@ -1143,7 +811,7 @@  int omap_dma_running(void)
 {
 	int lch;
 
-	if (cpu_class_is_omap1())
+	if (d->dev_caps & IS_WORD_16)
 		if (omap_lcd_dma_running())
 			return 1;
 
@@ -1161,7 +829,7 @@  int omap_dma_running(void)
  */
 void omap_dma_link_lch(int lch_head, int lch_queue)
 {
-	if (omap_dma_in_1510_mode()) {
+	if (enable_1510_mode) {
 		if (lch_head == lch_queue) {
 			dma_write(dma_read(CCR(lch_head)) | (3 << 8),
 								CCR(lch_head));
@@ -1188,7 +856,7 @@  EXPORT_SYMBOL(omap_dma_link_lch);
  */
 void omap_dma_unlink_lch(int lch_head, int lch_queue)
 {
-	if (omap_dma_in_1510_mode()) {
+	if (enable_1510_mode) {
 		if (lch_head == lch_queue) {
 			dma_write(dma_read(CCR(lch_head)) & ~(3 << 8),
 								CCR(lch_head));
@@ -1217,828 +885,11 @@  void omap_dma_unlink_lch(int lch_head, int lch_queue)
 }
 EXPORT_SYMBOL(omap_dma_unlink_lch);
 
-/*----------------------------------------------------------------------------*/
-
-#ifndef CONFIG_ARCH_OMAP1
-/* Create chain of DMA channesls */
-static void create_dma_lch_chain(int lch_head, int lch_queue)
-{
-	u32 l;
-
-	/* Check if this is the first link in chain */
-	if (dma_chan[lch_head].next_linked_ch == -1) {
-		dma_chan[lch_head].next_linked_ch = lch_queue;
-		dma_chan[lch_head].prev_linked_ch = lch_queue;
-		dma_chan[lch_queue].next_linked_ch = lch_head;
-		dma_chan[lch_queue].prev_linked_ch = lch_head;
-	}
-
-	/* a link exists, link the new channel in circular chain */
-	else {
-		dma_chan[lch_queue].next_linked_ch =
-					dma_chan[lch_head].next_linked_ch;
-		dma_chan[lch_queue].prev_linked_ch = lch_head;
-		dma_chan[lch_head].next_linked_ch = lch_queue;
-		dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
-					lch_queue;
-	}
-
-	l = dma_read(CLNK_CTRL(lch_head));
-	l &= ~(0x1f);
-	l |= lch_queue;
-	dma_write(l, CLNK_CTRL(lch_head));
-
-	l = dma_read(CLNK_CTRL(lch_queue));
-	l &= ~(0x1f);
-	l |= (dma_chan[lch_queue].next_linked_ch);
-	dma_write(l, CLNK_CTRL(lch_queue));
-}
-
-/**
- * @brief omap_request_dma_chain : Request a chain of DMA channels
- *
- * @param dev_id - Device id using the dma channel
- * @param dev_name - Device name
- * @param callback - Call back function
- * @chain_id -
- * @no_of_chans - Number of channels requested
- * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
- * 					      OMAP_DMA_DYNAMIC_CHAIN
- * @params - Channel parameters
- *
- * @return - Success : 0
- * 	     Failure: -EINVAL/-ENOMEM
- */
-int omap_request_dma_chain(int dev_id, const char *dev_name,
-			   void (*callback) (int lch, u16 ch_status,
-					     void *data),
-			   int *chain_id, int no_of_chans, int chain_mode,
-			   struct omap_dma_channel_params params)
-{
-	int *channels;
-	int i, err;
-
-	/* Is the chain mode valid ? */
-	if (chain_mode != OMAP_DMA_STATIC_CHAIN
-			&& chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
-		printk(KERN_ERR "Invalid chain mode requested\n");
-		return -EINVAL;
-	}
-
-	if (unlikely((no_of_chans < 1
-			|| no_of_chans > dma_lch_count))) {
-		printk(KERN_ERR "Invalid Number of channels requested\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * Allocate a queue to maintain the status of the channels
-	 * in the chain
-	 */
-	channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
-	if (channels == NULL) {
-		printk(KERN_ERR "omap_dma: No memory for channel queue\n");
-		return -ENOMEM;
-	}
-
-	/* request and reserve DMA channels for the chain */
-	for (i = 0; i < no_of_chans; i++) {
-		err = omap_request_dma(dev_id, dev_name,
-					callback, NULL, &channels[i]);
-		if (err < 0) {
-			int j;
-			for (j = 0; j < i; j++)
-				omap_free_dma(channels[j]);
-			kfree(channels);
-			printk(KERN_ERR "omap_dma: Request failed %d\n", err);
-			return err;
-		}
-		dma_chan[channels[i]].prev_linked_ch = -1;
-		dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
-
-		/*
-		 * Allowing client drivers to set common parameters now,
-		 * so that later only relevant (src_start, dest_start
-		 * and element count) can be set
-		 */
-		omap_set_dma_params(channels[i], &params);
-	}
-
-	*chain_id = channels[0];
-	dma_linked_lch[*chain_id].linked_dmach_q = channels;
-	dma_linked_lch[*chain_id].chain_mode = chain_mode;
-	dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
-	dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
-
-	for (i = 0; i < no_of_chans; i++)
-		dma_chan[channels[i]].chain_id = *chain_id;
-
-	/* Reset the Queue pointers */
-	OMAP_DMA_CHAIN_QINIT(*chain_id);
-
-	/* Set up the chain */
-	if (no_of_chans == 1)
-		create_dma_lch_chain(channels[0], channels[0]);
-	else {
-		for (i = 0; i < (no_of_chans - 1); i++)
-			create_dma_lch_chain(channels[i], channels[i + 1]);
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(omap_request_dma_chain);
-
-/**
- * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
- * params after setting it. Dont do this while dma is running!!
- *
- * @param chain_id - Chained logical channel id.
- * @param params
- *
- * @return - Success : 0
- * 	     Failure : -EINVAL
- */
-int omap_modify_dma_chain_params(int chain_id,
-				struct omap_dma_channel_params params)
-{
-	int *channels;
-	u32 i;
-
-	/* Check for input params */
-	if (unlikely((chain_id < 0
-			|| chain_id >= dma_lch_count))) {
-		printk(KERN_ERR "Invalid chain id\n");
-		return -EINVAL;
-	}
-
-	/* Check if the chain exists */
-	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
-		printk(KERN_ERR "Chain doesn't exists\n");
-		return -EINVAL;
-	}
-	channels = dma_linked_lch[chain_id].linked_dmach_q;
-
-	for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
-		/*
-		 * Allowing client drivers to set common parameters now,
-		 * so that later only relevant (src_start, dest_start
-		 * and element count) can be set
-		 */
-		omap_set_dma_params(channels[i], &params);
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(omap_modify_dma_chain_params);
-
-/**
- * @brief omap_free_dma_chain - Free all the logical channels in a chain.
- *
- * @param chain_id
- *
- * @return - Success : 0
- * 	     Failure : -EINVAL
- */
-int omap_free_dma_chain(int chain_id)
-{
-	int *channels;
-	u32 i;
-
-	/* Check for input params */
-	if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
-		printk(KERN_ERR "Invalid chain id\n");
-		return -EINVAL;
-	}
-
-	/* Check if the chain exists */
-	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
-		printk(KERN_ERR "Chain doesn't exists\n");
-		return -EINVAL;
-	}
-
-	channels = dma_linked_lch[chain_id].linked_dmach_q;
-	for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
-		dma_chan[channels[i]].next_linked_ch = -1;
-		dma_chan[channels[i]].prev_linked_ch = -1;
-		dma_chan[channels[i]].chain_id = -1;
-		dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
-		omap_free_dma(channels[i]);
-	}
-
-	kfree(channels);
-
-	dma_linked_lch[chain_id].linked_dmach_q = NULL;
-	dma_linked_lch[chain_id].chain_mode = -1;
-	dma_linked_lch[chain_id].chain_state = -1;
-
-	return (0);
-}
-EXPORT_SYMBOL(omap_free_dma_chain);
-
-/**
- * @brief omap_dma_chain_status - Check if the chain is in
- * active / inactive state.
- * @param chain_id
- *
- * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
- * 	     Failure : -EINVAL
- */
-int omap_dma_chain_status(int chain_id)
-{
-	/* Check for input params */
-	if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
-		printk(KERN_ERR "Invalid chain id\n");
-		return -EINVAL;
-	}
-
-	/* Check if the chain exists */
-	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
-		printk(KERN_ERR "Chain doesn't exists\n");
-		return -EINVAL;
-	}
-	pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
-			dma_linked_lch[chain_id].q_count);
-
-	if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
-		return OMAP_DMA_CHAIN_INACTIVE;
-
-	return OMAP_DMA_CHAIN_ACTIVE;
-}
-EXPORT_SYMBOL(omap_dma_chain_status);
-
-/**
- * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
- * set the params and start the transfer.
- *
- * @param chain_id
- * @param src_start - buffer start address
- * @param dest_start - Dest address
- * @param elem_count
- * @param frame_count
- * @param callbk_data - channel callback parameter data.
- *
- * @return  - Success : 0
- * 	      Failure: -EINVAL/-EBUSY
- */
-int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
-			int elem_count, int frame_count, void *callbk_data)
-{
-	int *channels;
-	u32 l, lch;
-	int start_dma = 0;
-
-	/*
-	 * if buffer size is less than 1 then there is
-	 * no use of starting the chain
-	 */
-	if (elem_count < 1) {
-		printk(KERN_ERR "Invalid buffer size\n");
-		return -EINVAL;
-	}
-
-	/* Check for input params */
-	if (unlikely((chain_id < 0
-			|| chain_id >= dma_lch_count))) {
-		printk(KERN_ERR "Invalid chain id\n");
-		return -EINVAL;
-	}
-
-	/* Check if the chain exists */
-	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
-		printk(KERN_ERR "Chain doesn't exist\n");
-		return -EINVAL;
-	}
-
-	/* Check if all the channels in chain are in use */
-	if (OMAP_DMA_CHAIN_QFULL(chain_id))
-		return -EBUSY;
-
-	/* Frame count may be negative in case of indexed transfers */
-	channels = dma_linked_lch[chain_id].linked_dmach_q;
-
-	/* Get a free channel */
-	lch = channels[dma_linked_lch[chain_id].q_tail];
-
-	/* Store the callback data */
-	dma_chan[lch].data = callbk_data;
-
-	/* Increment the q_tail */
-	OMAP_DMA_CHAIN_INCQTAIL(chain_id);
-
-	/* Set the params to the free channel */
-	if (src_start != 0)
-		dma_write(src_start, CSSA(lch));
-	if (dest_start != 0)
-		dma_write(dest_start, CDSA(lch));
-
-	/* Write the buffer size */
-	dma_write(elem_count, CEN(lch));
-	dma_write(frame_count, CFN(lch));
-
-	/*
-	 * If the chain is dynamically linked,
-	 * then we may have to start the chain if its not active
-	 */
-	if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
-
-		/*
-		 * In Dynamic chain, if the chain is not started,
-		 * queue the channel
-		 */
-		if (dma_linked_lch[chain_id].chain_state ==
-						DMA_CHAIN_NOTSTARTED) {
-			/* Enable the link in previous channel */
-			if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
-								DMA_CH_QUEUED)
-				enable_lnk(dma_chan[lch].prev_linked_ch);
-			dma_chan[lch].state = DMA_CH_QUEUED;
-		}
-
-		/*
-		 * Chain is already started, make sure its active,
-		 * if not then start the chain
-		 */
-		else {
-			start_dma = 1;
-
-			if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
-							DMA_CH_STARTED) {
-				enable_lnk(dma_chan[lch].prev_linked_ch);
-				dma_chan[lch].state = DMA_CH_QUEUED;
-				start_dma = 0;
-				if (0 == ((1 << 7) & dma_read(
-					CCR(dma_chan[lch].prev_linked_ch)))) {
-					disable_lnk(dma_chan[lch].
-						    prev_linked_ch);
-					pr_debug("\n prev ch is stopped\n");
-					start_dma = 1;
-				}
-			}
-
-			else if (dma_chan[dma_chan[lch].prev_linked_ch].state
-							== DMA_CH_QUEUED) {
-				enable_lnk(dma_chan[lch].prev_linked_ch);
-				dma_chan[lch].state = DMA_CH_QUEUED;
-				start_dma = 0;
-			}
-			omap_enable_channel_irq(lch);
-
-			l = dma_read(CCR(lch));
-
-			if ((0 == (l & (1 << 24))))
-				l &= ~(1 << 25);
-			else
-				l |= (1 << 25);
-			if (start_dma == 1) {
-				if (0 == (l & (1 << 7))) {
-					l |= (1 << 7);
-					dma_chan[lch].state = DMA_CH_STARTED;
-					pr_debug("starting %d\n", lch);
-					dma_write(l, CCR(lch));
-				} else
-					start_dma = 0;
-			} else {
-				if (0 == (l & (1 << 7)))
-					dma_write(l, CCR(lch));
-			}
-			dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
-		}
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(omap_dma_chain_a_transfer);
-
-/**
- * @brief omap_start_dma_chain_transfers - Start the chain
- *
- * @param chain_id
- *
- * @return - Success : 0
- * 	     Failure : -EINVAL/-EBUSY
- */
-int omap_start_dma_chain_transfers(int chain_id)
-{
-	int *channels;
-	u32 l, i;
-
-	if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
-		printk(KERN_ERR "Invalid chain id\n");
-		return -EINVAL;
-	}
-
-	channels = dma_linked_lch[chain_id].linked_dmach_q;
-
-	if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
-		printk(KERN_ERR "Chain is already started\n");
-		return -EBUSY;
-	}
-
-	if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
-		for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
-									i++) {
-			enable_lnk(channels[i]);
-			omap_enable_channel_irq(channels[i]);
-		}
-	} else {
-		omap_enable_channel_irq(channels[0]);
-	}
-
-	l = dma_read(CCR(channels[0]));
-	l |= (1 << 7);
-	dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
-	dma_chan[channels[0]].state = DMA_CH_STARTED;
-
-	if ((0 == (l & (1 << 24))))
-		l &= ~(1 << 25);
-	else
-		l |= (1 << 25);
-	dma_write(l, CCR(channels[0]));
-
-	dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
-
-	return 0;
-}
-EXPORT_SYMBOL(omap_start_dma_chain_transfers);
-
-/**
- * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
- *
- * @param chain_id
- *
- * @return - Success : 0
- * 	     Failure : EINVAL
- */
-int omap_stop_dma_chain_transfers(int chain_id)
-{
-	int *channels;
-	u32 l, i;
-	u32 get_sysconfig;
-
-	/* Check for input params */
-	if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
-		printk(KERN_ERR "Invalid chain id\n");
-		return -EINVAL;
-	}
-
-	/* Check if the chain exists */
-	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
-		printk(KERN_ERR "Chain doesn't exists\n");
-		return -EINVAL;
-	}
-	channels = dma_linked_lch[chain_id].linked_dmach_q;
-
-	if (p->errata & DMA_SYSCONFIG_ERRATA)
-		dma_ocpsysconfig_errata(&get_sysconfig, false);
-
-	for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
-
-		/* Stop the Channel transmission */
-		l = dma_read(CCR(channels[i]));
-		l &= ~(1 << 7);
-		dma_write(l, CCR(channels[i]));
-
-		/* Disable the link in all the channels */
-		disable_lnk(channels[i]);
-		dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
-
-	}
-	dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
-
-	/* Reset the Queue pointers */
-	OMAP_DMA_CHAIN_QINIT(chain_id);
-
-	if (p->errata & DMA_SYSCONFIG_ERRATA)
-		dma_ocpsysconfig_errata(&get_sysconfig, true);
-
-	return 0;
-}
-EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
-
-/* Get the index of the ongoing DMA in chain */
-/**
- * @brief omap_get_dma_chain_index - Get the element and frame index
- * of the ongoing DMA in chain
- *
- * @param chain_id
- * @param ei - Element index
- * @param fi - Frame index
- *
- * @return - Success : 0
- * 	     Failure : -EINVAL
- */
-int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
-{
-	int lch;
-	int *channels;
-
-	/* Check for input params */
-	if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
-		printk(KERN_ERR "Invalid chain id\n");
-		return -EINVAL;
-	}
-
-	/* Check if the chain exists */
-	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
-		printk(KERN_ERR "Chain doesn't exists\n");
-		return -EINVAL;
-	}
-	if ((!ei) || (!fi))
-		return -EINVAL;
-
-	channels = dma_linked_lch[chain_id].linked_dmach_q;
-
-	/* Get the current channel */
-	lch = channels[dma_linked_lch[chain_id].q_head];
-
-	*ei = dma_read(CCEN(lch));
-	*fi = dma_read(CCFN(lch));
-
-	return 0;
-}
-EXPORT_SYMBOL(omap_get_dma_chain_index);
-
-/**
- * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
- * ongoing DMA in chain
- *
- * @param chain_id
- *
- * @return - Success : Destination position
- * 	     Failure : -EINVAL
- */
-int omap_get_dma_chain_dst_pos(int chain_id)
-{
-	int lch;
-	int *channels;
-
-	/* Check for input params */
-	if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
-		printk(KERN_ERR "Invalid chain id\n");
-		return -EINVAL;
-	}
-
-	/* Check if the chain exists */
-	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
-		printk(KERN_ERR "Chain doesn't exists\n");
-		return -EINVAL;
-	}
-
-	channels = dma_linked_lch[chain_id].linked_dmach_q;
-
-	/* Get the current channel */
-	lch = channels[dma_linked_lch[chain_id].q_head];
-
-	return dma_read(CDAC(lch));
-}
-EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
-
-/**
- * @brief omap_get_dma_chain_src_pos - Get the source position
- * of the ongoing DMA in chain
- * @param chain_id
- *
- * @return - Success : Destination position
- * 	     Failure : -EINVAL
- */
-int omap_get_dma_chain_src_pos(int chain_id)
-{
-	int lch;
-	int *channels;
-
-	/* Check for input params */
-	if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
-		printk(KERN_ERR "Invalid chain id\n");
-		return -EINVAL;
-	}
-
-	/* Check if the chain exists */
-	if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
-		printk(KERN_ERR "Chain doesn't exists\n");
-		return -EINVAL;
-	}
-
-	channels = dma_linked_lch[chain_id].linked_dmach_q;
-
-	/* Get the current channel */
-	lch = channels[dma_linked_lch[chain_id].q_head];
-
-	return dma_read(CSAC(lch));
-}
-EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
-#endif	/* ifndef CONFIG_ARCH_OMAP1 */
-
-/*----------------------------------------------------------------------------*/
-
-#ifdef CONFIG_ARCH_OMAP1
-
-static int omap1_dma_handle_ch(int ch)
-{
-	u32 csr;
-
-	if (enable_1510_mode && ch >= 6) {
-		csr = dma_chan[ch].saved_csr;
-		dma_chan[ch].saved_csr = 0;
-	} else
-		csr = dma_read(CSR(ch));
-	if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
-		dma_chan[ch + 6].saved_csr = csr >> 7;
-		csr &= 0x7f;
-	}
-	if ((csr & 0x3f) == 0)
-		return 0;
-	if (unlikely(dma_chan[ch].dev_id == -1)) {
-		printk(KERN_WARNING "Spurious interrupt from DMA channel "
-		       "%d (CSR %04x)\n", ch, csr);
-		return 0;
-	}
-	if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
-		printk(KERN_WARNING "DMA timeout with device %d\n",
-		       dma_chan[ch].dev_id);
-	if (unlikely(csr & OMAP_DMA_DROP_IRQ))
-		printk(KERN_WARNING "DMA synchronization event drop occurred "
-		       "with device %d\n", dma_chan[ch].dev_id);
-	if (likely(csr & OMAP_DMA_BLOCK_IRQ))
-		dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
-	if (likely(dma_chan[ch].callback != NULL))
-		dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
-
-	return 1;
-}
-
-static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
-{
-	int ch = ((int) dev_id) - 1;
-	int handled = 0;
-
-	for (;;) {
-		int handled_now = 0;
-
-		handled_now += omap1_dma_handle_ch(ch);
-		if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
-			handled_now += omap1_dma_handle_ch(ch + 6);
-		if (!handled_now)
-			break;
-		handled += handled_now;
-	}
-
-	return handled ? IRQ_HANDLED : IRQ_NONE;
-}
-
-#else
-#define omap1_dma_irq_handler	NULL
-#endif
-
-#ifdef CONFIG_ARCH_OMAP2PLUS
-
-static int omap2_dma_handle_ch(int ch)
-{
-	u32 status = dma_read(CSR(ch));
-
-	if (!status) {
-		if (printk_ratelimit())
-			printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n",
-				ch);
-		dma_write(1 << ch, IRQSTATUS_L0);
-		return 0;
-	}
-	if (unlikely(dma_chan[ch].dev_id == -1)) {
-		if (printk_ratelimit())
-			printk(KERN_WARNING "IRQ %04x for non-allocated DMA"
-					"channel %d\n", status, ch);
-		return 0;
-	}
-	if (unlikely(status & OMAP_DMA_DROP_IRQ))
-		printk(KERN_INFO
-		       "DMA synchronization event drop occurred with device "
-		       "%d\n", dma_chan[ch].dev_id);
-	if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
-		printk(KERN_INFO "DMA transaction error with device %d\n",
-		       dma_chan[ch].dev_id);
-		if (cpu_class_is_omap2()) {
-			/*
-			 * Errata: sDMA Channel is not disabled
-			 * after a transaction error. So we explicitely
-			 * disable the channel
-			 */
-			u32 ccr;
-
-			ccr = dma_read(CCR(ch));
-			ccr &= ~OMAP_DMA_CCR_EN;
-			dma_write(ccr, CCR(ch));
-			dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
-		}
-	}
-	if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
-		printk(KERN_INFO "DMA secure error with device %d\n",
-		       dma_chan[ch].dev_id);
-	if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
-		printk(KERN_INFO "DMA misaligned error with device %d\n",
-		       dma_chan[ch].dev_id);
-
-	dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch));
-	dma_write(1 << ch, IRQSTATUS_L0);
-
-	/* If the ch is not chained then chain_id will be -1 */
-	if (dma_chan[ch].chain_id != -1) {
-		int chain_id = dma_chan[ch].chain_id;
-		dma_chan[ch].state = DMA_CH_NOTSTARTED;
-		if (dma_read(CLNK_CTRL(ch)) & (1 << 15))
-			dma_chan[dma_chan[ch].next_linked_ch].state =
-							DMA_CH_STARTED;
-		if (dma_linked_lch[chain_id].chain_mode ==
-						OMAP_DMA_DYNAMIC_CHAIN)
-			disable_lnk(ch);
-
-		if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
-			OMAP_DMA_CHAIN_INCQHEAD(chain_id);
-
-		status = dma_read(CSR(ch));
-	}
-
-	dma_write(status, CSR(ch));
-
-	if (likely(dma_chan[ch].callback != NULL))
-		dma_chan[ch].callback(ch, status, dma_chan[ch].data);
-
-	return 0;
-}
-
-/* STATUS register count is from 1-32 while our is 0-31 */
-static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
-{
-	u32 val, enable_reg;
-	int i;
-
-	val = dma_read(IRQSTATUS_L0);
-	if (val == 0) {
-		if (printk_ratelimit())
-			printk(KERN_WARNING "Spurious DMA IRQ\n");
-		return IRQ_HANDLED;
-	}
-	enable_reg = dma_read(IRQENABLE_L0);
-	val &= enable_reg; /* Dispatch only relevant interrupts */
-	for (i = 0; i < dma_lch_count && val != 0; i++) {
-		if (val & 1)
-			omap2_dma_handle_ch(i);
-		val >>= 1;
-	}
-
-	return IRQ_HANDLED;
-}
-
-static struct irqaction omap24xx_dma_irq = {
-	.name = "DMA",
-	.handler = omap2_dma_irq_handler,
-	.flags = IRQF_DISABLED
-};
-
-#else
-static struct irqaction omap24xx_dma_irq;
-#endif
-
-/*----------------------------------------------------------------------------*/
-
-void omap_dma_global_context_save(void)
-{
-	omap_dma_global_context.dma_irqenable_l0 =
-		dma_read(IRQENABLE_L0);
-	omap_dma_global_context.dma_ocp_sysconfig =
-		dma_read(OCP_SYSCONFIG);
-	omap_dma_global_context.dma_gcr = dma_read(GCR);
-}
-
-void omap_dma_global_context_restore(void)
-{
-	int ch;
-
-	dma_write(omap_dma_global_context.dma_gcr, GCR);
-	dma_write(omap_dma_global_context.dma_ocp_sysconfig,
-		OCP_SYSCONFIG);
-	dma_write(omap_dma_global_context.dma_irqenable_l0,
-		IRQENABLE_L0);
-
-	/*
-	 * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
-	 * after secure sram context save and restore. Hence we need to
-	 * manually clear those IRQs to avoid spurious interrupts. This
-	 * affects only secure devices.
-	 */
-	if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
-		dma_write(0x3 , IRQSTATUS_L0);
-
-	for (ch = 0; ch < dma_chan_count; ch++)
-		if (dma_chan[ch].dev_id != -1)
-			omap_clear_dma(ch);
-}
-
 static int __devinit omap_system_dma_probe(struct platform_device *pdev)
 {
 	struct omap_system_dma_plat_info *pdata = pdev->dev.platform_data;
 	struct resource *mem;
 	int ch, ret = 0;
-	int dma_irq;
-	char irq_name[4];
 
 	if (!pdata) {
 		dev_err(&pdev->dev, "%s: System DMA initialized without"
@@ -2059,10 +910,11 @@  static int __devinit omap_system_dma_probe(struct platform_device *pdev)
 	if (!omap_dma_base) {
 		dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
 		ret = -ENOMEM;
-		goto exit_release_region;
+		release_mem_region(mem->start, resource_size(mem));
+		return ret;
 	}
 
-	if (cpu_class_is_omap2() && omap_dma_reserve_channels
+	if (!(d->dev_caps & IS_WORD_16) && omap_dma_reserve_channels
 			&& (omap_dma_reserve_channels <= dma_lch_count))
 		d->lch_count = omap_dma_reserve_channels;
 
@@ -2070,19 +922,11 @@  static int __devinit omap_system_dma_probe(struct platform_device *pdev)
 	dma_chan_count		= d->chan_count;
 	dma_chan		= d->chan;
 
-	if (cpu_class_is_omap2()) {
-		dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
-						dma_lch_count, GFP_KERNEL);
-		if (!dma_linked_lch) {
-			ret = -ENOMEM;
-			goto exit_dma_chan;
-		}
-	}
 	enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
 
-	if (cpu_is_omap15xx()) {
+	if (enable_1510_mode) {
 		printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
-	} else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
+	} else if (d->dev_caps & IS_WORD_16) {
 		printk(KERN_INFO "OMAP DMA hardware version %d\n",
 		       dma_read(HW_ID));
 		printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
@@ -2100,7 +944,7 @@  static int __devinit omap_system_dma_probe(struct platform_device *pdev)
 			w |= 1 << 3;
 			dma_write(w, GSCR);
 		}
-	} else if (cpu_class_is_omap2()) {
+	} else {
 		u8 revision = dma_read(REVISION) & 0xff;
 		printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
 		       revision >> 4, revision & 0xf);
@@ -2109,61 +953,23 @@  static int __devinit omap_system_dma_probe(struct platform_device *pdev)
 	spin_lock_init(&dma_chan_lock);
 	for (ch = 0; ch < dma_chan_count; ch++) {
 		omap_clear_dma(ch);
-		if (cpu_class_is_omap2())
-			omap2_disable_irq_lch(ch);
+		if (p->disable_irq_lch) {
+			unsigned long flags;
+			spin_lock_irqsave(&dma_chan_lock, flags);
+			p->disable_irq_lch(ch);
+			spin_unlock_irqrestore(&dma_chan_lock, flags);
+		}
 
 		dma_chan[ch].dev_id = -1;
 		dma_chan[ch].next_lch = -1;
-
-		if (ch >= 6 && enable_1510_mode)
-			continue;
-
-		if (cpu_class_is_omap1()) {
-			/*
-			 * request_irq() doesn't like dev_id (ie. ch) being
-			 * zero, so we have to kludge around this.
-			 */
-			sprintf(&irq_name[0], "%d", ch);
-			dma_irq = platform_get_irq_byname(pdev, irq_name);
-
-			if (dma_irq < 0) {
-				dev_err(&pdev->dev, "%s:unable to get irq\n",
-								__func__);
-				ret = dma_irq;
-				goto exit_unmap;
-			}
-			ret = request_irq(dma_irq,
-					omap1_dma_irq_handler, 0, "DMA",
-					(void *) (ch + 1));
-			if (ret != 0) {
-				int irq_rel;
-				printk(KERN_ERR "unable to request IRQ %d"
-					"for DMA (error %d)\n", dma_irq, ret);
-				for (irq_rel = 0; irq_rel < ch;
-								irq_rel++) {
-					dma_irq = platform_get_irq(pdev,
-								irq_rel);
-					free_irq(dma_irq, (void *)
-							(irq_rel + 1));
-					goto exit_dma_chan;
-				}
-			}
-		}
 	}
 
-	if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx())
+	if (d->dev_caps & GLOBAL_PRIORITY)
 		omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
 				DMA_DEFAULT_FIFO_DEPTH, 0);
 
-	if (cpu_class_is_omap2()) {
-		strcpy(irq_name, "0");
-		dma_irq = platform_get_irq_byname(pdev, irq_name);
-		setup_irq(dma_irq, &omap24xx_dma_irq);
-	}
-
 	/* reserve dma channels 0 and 1 in high security devices */
-	if (cpu_is_omap34xx() &&
-		(omap_type() != OMAP2_DEVICE_TYPE_GP)) {
+	if (d->dev_caps & RESERVE_CHANNEL) {
 		printk(KERN_INFO "Reserving DMA channels 0 and 1 for "
 				"HS ROM code\n");
 		dma_chan[0].dev_id = 0;
@@ -2179,14 +985,6 @@  static int __devinit omap_system_dma_probe(struct platform_device *pdev)
 
 	dev_info(&pdev->dev, "System DMA registered\n");
 	return 0;
-
-exit_dma_chan:
-	kfree(dma_chan);
-exit_unmap:
-	iounmap(omap_dma_base);
-exit_release_region:
-	release_mem_region(mem->start, resource_size(mem));
-	return ret;
 }
 
 static int __devexit omap_system_dma_remove(struct platform_device *pdev)
diff --git a/arch/arm/plat-omap/include/plat/dma.h b/arch/arm/plat-omap/include/plat/dma.h
index ca251ac..3bf7c19 100644
--- a/arch/arm/plat-omap/include/plat/dma.h
+++ b/arch/arm/plat-omap/include/plat/dma.h
@@ -242,6 +242,9 @@ 
 #define DMA_THREAD_FIFO_25		(0x02 << 14)
 #define DMA_THREAD_FIFO_50		(0x03 << 14)
 
+#define OMAP_DMA_ACTIVE			0x01
+#define OMAP2_DMA_CSR_CLEAR_MASK	0xffe
+
 /* Chaining modes*/
 #ifndef CONFIG_ARCH_OMAP1
 #define OMAP_DMA_STATIC_CHAIN		0x1
@@ -355,6 +358,16 @@  struct omap_system_dma_plat_info {
 	struct omap_dma_dev_attr *dma_attr;
 	void __iomem *omap_dma_base;
 	u32 errata;
+	void (*enable_irq_lch)(int lch);
+	void (*disable_irq_lch)(int lch);
+	void (*enable_lnk)(int lch);
+	void (*disable_lnk)(int lch);
+	void (*clear_lch_regs)(int lch);
+	int (*get_gdma_dev)(int req);
+	void (*set_gdma_dev)(int req, int dev);
+	void (*enable_channel_irq)(int lch);
+	void (*disable_channel_irq)(int lch);
+	void (*set_dma_chain_ch)(int free_ch);
 };
 
 extern void omap_set_dma_priority(int lch, int dst_port, int priority);
@@ -418,29 +431,6 @@  void omap_dma_global_context_restore(void);
 
 extern void omap_dma_disable_irq(int lch);
 
-/* Chaining APIs */
-#ifndef CONFIG_ARCH_OMAP1
-extern int omap_request_dma_chain(int dev_id, const char *dev_name,
-				  void (*callback) (int lch, u16 ch_status,
-						    void *data),
-				  int *chain_id, int no_of_chans,
-				  int chain_mode,
-				  struct omap_dma_channel_params params);
-extern int omap_free_dma_chain(int chain_id);
-extern int omap_dma_chain_a_transfer(int chain_id, int src_start,
-				     int dest_start, int elem_count,
-				     int frame_count, void *callbk_data);
-extern int omap_start_dma_chain_transfers(int chain_id);
-extern int omap_stop_dma_chain_transfers(int chain_id);
-extern int omap_get_dma_chain_index(int chain_id, int *ei, int *fi);
-extern int omap_get_dma_chain_dst_pos(int chain_id);
-extern int omap_get_dma_chain_src_pos(int chain_id);
-
-extern int omap_modify_dma_chain_params(int chain_id,
-					struct omap_dma_channel_params params);
-extern int omap_dma_chain_status(int chain_id);
-#endif
-
 #if defined(CONFIG_ARCH_OMAP1) && defined(CONFIG_FB_OMAP)
 #include <mach/lcd_dma.h>
 #else