Merge tag 'ux500-dma40-for-arm-soc-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-stericsson into next/drivers

From Linus Walleij:
Second set of DMA40 changes: refactorings and device tree
support for the DMA40. Now with MUSB and some platform
data removal.

* tag 'ux500-dma40-for-arm-soc-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-stericsson:
  dmaengine: ste_dma40: Fetch disabled channels from DT
  dmaengine: ste_dma40: Fetch the number of physical channels from DT
  ARM: ux500: Stop passing DMA platform data though AUXDATA
  dmaengine: ste_dma40: Allow memcpy channels to be configured from DT
  dmaengine: ste_dma40_ll: Replace meaningless register set with comment
  dmaengine: ste_dma40: Convert data_width from register bit format to value
  dmaengine: ste_dma40_ll: Use the BIT macro to replace ugly '(1 << x)'s
  ARM: ux500: Remove recently unused stedma40_xfer_dir enums
  dmaengine: ste_dma40: Replace ST-E's home-brew DMA direction defs with generic ones
  ARM: ux500: Replace ST-E's home-brew DMA direction definition with the generic one
  dmaengine: ste_dma40: Use the BIT macro to replace ugly '(1 << x)'s
  ARM: ux500: Remove empty function u8500_of_init_devices()
  ARM: ux500: Remove ux500-musb platform registation when booting with DT
  usb: musb: ux500: add device tree probing support
  usb: musb: ux500: attempt to find channels by name before using pdata
  usb: musb: ux500: harden checks for platform data
  usb: musb: ux500: take the dma_mask from coherent_dma_mask
  usb: musb: ux500: move the MUSB HDRC configuration into the driver
  usb: musb: ux500: move channel number knowledge into the driver

4 files changed, 275 insertions, 161 deletions

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 7f23d45166c3..fa4f9a33a74d 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -54,10 +54,12 @@
 #define MAX_LCLA_ALLOC_ATTEMPTS 256
 
 /* Bit markings for allocation map */
-#define D40_ALLOC_FREE		(1 << 31)
-#define D40_ALLOC_PHY		(1 << 30)
+#define D40_ALLOC_FREE		BIT(31)
+#define D40_ALLOC_PHY		BIT(30)
 #define D40_ALLOC_LOG_FREE	0
 
+#define D40_MEMCPY_MAX_CHANS	8
+
 /* Reserved event lines for memcpy only. */
 #define DB8500_DMA_MEMCPY_EV_0	51
 #define DB8500_DMA_MEMCPY_EV_1	56
@@ -78,13 +80,13 @@ static int dma40_memcpy_channels[] = {
 /* Default configuration for physcial memcpy */
 struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
 	.mode = STEDMA40_MODE_PHYSICAL,
-	.dir = STEDMA40_MEM_TO_MEM,
+	.dir = DMA_MEM_TO_MEM,
 
-	.src_info.data_width = STEDMA40_BYTE_WIDTH,
+	.src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
 	.src_info.psize = STEDMA40_PSIZE_PHY_1,
 	.src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
 
-	.dst_info.data_width = STEDMA40_BYTE_WIDTH,
+	.dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
 	.dst_info.psize = STEDMA40_PSIZE_PHY_1,
 	.dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
 };
@@ -92,13 +94,13 @@ struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
 /* Default configuration for logical memcpy */
 struct stedma40_chan_cfg dma40_memcpy_conf_log = {
 	.mode = STEDMA40_MODE_LOGICAL,
-	.dir = STEDMA40_MEM_TO_MEM,
+	.dir = DMA_MEM_TO_MEM,
 
-	.src_info.data_width = STEDMA40_BYTE_WIDTH,
+	.src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
 	.src_info.psize = STEDMA40_PSIZE_LOG_1,
 	.src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
 
-	.dst_info.data_width = STEDMA40_BYTE_WIDTH,
+	.dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
 	.dst_info.psize = STEDMA40_PSIZE_LOG_1,
 	.dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
 };
@@ -522,6 +524,8 @@ struct d40_gen_dmac {
  * @phy_start: Physical memory start of the DMA registers.
  * @phy_size: Size of the DMA register map.
  * @irq: The IRQ number.
+ * @num_memcpy_chans: The number of channels used for memcpy (mem-to-mem
+ * transfers).
  * @num_phy_chans: The number of physical channels. Read from HW. This
  * is the number of available channels for this driver, not counting "Secure
  * mode" allocated physical channels.
@@ -565,6 +569,7 @@ struct d40_base {
 	phys_addr_t			  phy_start;
 	resource_size_t			  phy_size;
 	int				  irq;
+	int				  num_memcpy_chans;
 	int				  num_phy_chans;
 	int				  num_log_chans;
 	struct device_dma_parameters	  dma_parms;
@@ -843,7 +848,7 @@ static void d40_log_lli_to_lcxa(struct d40_chan *chan, struct d40_desc *desc)
 		 * that uses linked lists.
 		 */
 		if (!(chan->phy_chan->use_soft_lli &&
-			chan->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM))
+			chan->dma_cfg.dir == DMA_DEV_TO_MEM))
 			curr_lcla = d40_lcla_alloc_one(chan, desc);
 
 		first_lcla = curr_lcla;
@@ -1005,20 +1010,21 @@ static int d40_psize_2_burst_size(bool is_log, int psize)
 
 /*
  * The dma only supports transmitting packages up to
- * STEDMA40_MAX_SEG_SIZE << data_width. Calculate the total number of
- * dma elements required to send the entire sg list
+ * STEDMA40_MAX_SEG_SIZE * data_width, where data_width is stored in Bytes.
+ *
+ * Calculate the total number of dma elements required to send the entire sg list.
  */
 static int d40_size_2_dmalen(int size, u32 data_width1, u32 data_width2)
 {
 	int dmalen;
 	u32 max_w = max(data_width1, data_width2);
 	u32 min_w = min(data_width1, data_width2);
-	u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE << min_w, 1 << max_w);
+	u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w);
 
 	if (seg_max > STEDMA40_MAX_SEG_SIZE)
-		seg_max -= (1 << max_w);
+		seg_max -= max_w;
 
-	if (!IS_ALIGNED(size, 1 << max_w))
+	if (!IS_ALIGNED(size, max_w))
 		return -EINVAL;
 
 	if (size <= seg_max)
@@ -1311,12 +1317,12 @@ static void d40_config_set_event(struct d40_chan *d40c,
 	u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
 
 	/* Enable event line connected to device (or memcpy) */
-	if ((d40c->dma_cfg.dir ==  STEDMA40_PERIPH_TO_MEM) ||
-	    (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH))
+	if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) ||
+	    (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
 		__d40_config_set_event(d40c, event_type, event,
 				       D40_CHAN_REG_SSLNK);
 
-	if (d40c->dma_cfg.dir !=  STEDMA40_PERIPH_TO_MEM)
+	if (d40c->dma_cfg.dir !=  DMA_DEV_TO_MEM)
 		__d40_config_set_event(d40c, event_type, event,
 				       D40_CHAN_REG_SDLNK);
 }
@@ -1464,7 +1470,7 @@ static u32 d40_residue(struct d40_chan *d40c)
 			  >> D40_SREG_ELEM_PHY_ECNT_POS;
 	}
 
-	return num_elt * (1 << d40c->dma_cfg.dst_info.data_width);
+	return num_elt * d40c->dma_cfg.dst_info.data_width;
 }
 
 static bool d40_tx_is_linked(struct d40_chan *d40c)
@@ -1740,7 +1746,7 @@ static irqreturn_t d40_handle_interrupt(int irq, void *data)
 		}
 
 		/* ACK interrupt */
-		writel(1 << idx, base->virtbase + il[row].clr);
+		writel(BIT(idx), base->virtbase + il[row].clr);
 
 		spin_lock(&d40c->lock);
 
@@ -1776,7 +1782,7 @@ static int d40_validate_conf(struct d40_chan *d40c,
 		res = -EINVAL;
 	}
 
-	if (conf->dir == STEDMA40_PERIPH_TO_PERIPH) {
+	if (conf->dir == DMA_DEV_TO_DEV) {
 		/*
 		 * DMAC HW supports it. Will be added to this driver,
 		 * in case any dma client requires it.
@@ -1786,9 +1792,9 @@ static int d40_validate_conf(struct d40_chan *d40c,
 	}
 
 	if (d40_psize_2_burst_size(is_log, conf->src_info.psize) *
-	    (1 << conf->src_info.data_width) !=
+	    conf->src_info.data_width !=
 	    d40_psize_2_burst_size(is_log, conf->dst_info.psize) *
-	    (1 << conf->dst_info.data_width)) {
+	    conf->dst_info.data_width) {
 		/*
 		 * The DMAC hardware only supports
 		 * src (burst x width) == dst (burst x width)
@@ -1830,8 +1836,8 @@ static bool d40_alloc_mask_set(struct d40_phy_res *phy,
 		if (phy->allocated_src == D40_ALLOC_FREE)
 			phy->allocated_src = D40_ALLOC_LOG_FREE;
 
-		if (!(phy->allocated_src & (1 << log_event_line))) {
-			phy->allocated_src |= 1 << log_event_line;
+		if (!(phy->allocated_src & BIT(log_event_line))) {
+			phy->allocated_src |= BIT(log_event_line);
 			goto found;
 		} else
 			goto not_found;
@@ -1842,8 +1848,8 @@ static bool d40_alloc_mask_set(struct d40_phy_res *phy,
 		if (phy->allocated_dst == D40_ALLOC_FREE)
 			phy->allocated_dst = D40_ALLOC_LOG_FREE;
 
-		if (!(phy->allocated_dst & (1 << log_event_line))) {
-			phy->allocated_dst |= 1 << log_event_line;
+		if (!(phy->allocated_dst & BIT(log_event_line))) {
+			phy->allocated_dst |= BIT(log_event_line);
 			goto found;
 		} else
 			goto not_found;
@@ -1873,11 +1879,11 @@ static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src,
 
 	/* Logical channel */
 	if (is_src) {
-		phy->allocated_src &= ~(1 << log_event_line);
+		phy->allocated_src &= ~BIT(log_event_line);
 		if (phy->allocated_src == D40_ALLOC_LOG_FREE)
 			phy->allocated_src = D40_ALLOC_FREE;
 	} else {
-		phy->allocated_dst &= ~(1 << log_event_line);
+		phy->allocated_dst &= ~BIT(log_event_line);
 		if (phy->allocated_dst == D40_ALLOC_LOG_FREE)
 			phy->allocated_dst = D40_ALLOC_FREE;
 	}
@@ -1907,11 +1913,11 @@ static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
 	phys = d40c->base->phy_res;
 	num_phy_chans = d40c->base->num_phy_chans;
 
-	if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
+	if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
 		log_num = 2 * dev_type;
 		is_src = true;
-	} else if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
-		   d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
+	} else if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
+		   d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
 		/* dst event lines are used for logical memcpy */
 		log_num = 2 * dev_type + 1;
 		is_src = false;
@@ -1922,7 +1928,7 @@ static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
 	event_line = D40_TYPE_TO_EVENT(dev_type);
 
 	if (!is_log) {
-		if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
+		if (d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
 			/* Find physical half channel */
 			if (d40c->dma_cfg.use_fixed_channel) {
 				i = d40c->dma_cfg.phy_channel;
@@ -2070,10 +2076,10 @@ static int d40_free_dma(struct d40_chan *d40c)
 		return -EINVAL;
 	}
 
-	if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
-	    d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM)
+	if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
+	    d40c->dma_cfg.dir == DMA_MEM_TO_MEM)
 		is_src = false;
-	else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM)
+	else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
 		is_src = true;
 	else {
 		chan_err(d40c, "Unknown direction\n");
@@ -2135,10 +2141,10 @@ static bool d40_is_paused(struct d40_chan *d40c)
 		goto _exit;
 	}
 
-	if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
-	    d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
+	if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
+	    d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
 		status = readl(chanbase + D40_CHAN_REG_SDLNK);
-	} else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
+	} else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
 		status = readl(chanbase + D40_CHAN_REG_SSLNK);
 	} else {
 		chan_err(d40c, "Unknown direction\n");
@@ -2358,7 +2364,7 @@ static void __d40_set_prio_rt(struct d40_chan *d40c, int dev_type, bool src)
 	u32 rtreg;
 	u32 event = D40_TYPE_TO_EVENT(dev_type);
 	u32 group = D40_TYPE_TO_GROUP(dev_type);
-	u32 bit = 1 << event;
+	u32 bit = BIT(event);
 	u32 prioreg;
 	struct d40_gen_dmac *dmac = &d40c->base->gen_dmac;
 
@@ -2389,12 +2395,12 @@ static void d40_set_prio_realtime(struct d40_chan *d40c)
 	if (d40c->base->rev < 3)
 		return;
 
-	if ((d40c->dma_cfg.dir ==  STEDMA40_PERIPH_TO_MEM) ||
-	    (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH))
+	if ((d40c->dma_cfg.dir ==  DMA_DEV_TO_MEM) ||
+	    (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
 		__d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, true);
 
-	if ((d40c->dma_cfg.dir ==  STEDMA40_MEM_TO_PERIPH) ||
-	    (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH))
+	if ((d40c->dma_cfg.dir ==  DMA_MEM_TO_DEV) ||
+	    (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
 		__d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, false);
 }
 
@@ -2425,11 +2431,11 @@ static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec,
 
 	switch (D40_DT_FLAGS_DIR(flags)) {
 	case 0:
-		cfg.dir = STEDMA40_MEM_TO_PERIPH;
+		cfg.dir = DMA_MEM_TO_DEV;
 		cfg.dst_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
 		break;
 	case 1:
-		cfg.dir = STEDMA40_PERIPH_TO_MEM;
+		cfg.dir = DMA_DEV_TO_MEM;
 		cfg.src_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
 		break;
 	}
@@ -2475,7 +2481,7 @@ static int d40_alloc_chan_resources(struct dma_chan *chan)
 	d40_set_prio_realtime(d40c);
 
 	if (chan_is_logical(d40c)) {
-		if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM)
+		if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
 			d40c->lcpa = d40c->base->lcpa_base +
 				d40c->dma_cfg.dev_type * D40_LCPA_CHAN_SIZE;
 		else
@@ -2675,33 +2681,10 @@ static void d40_terminate_all(struct dma_chan *chan)
 static int
 dma40_config_to_halfchannel(struct d40_chan *d40c,
 			    struct stedma40_half_channel_info *info,
-			    enum dma_slave_buswidth width,
 			    u32 maxburst)
 {
-	enum stedma40_periph_data_width addr_width;
 	int psize;
 
-	switch (width) {
-	case DMA_SLAVE_BUSWIDTH_1_BYTE:
-		addr_width = STEDMA40_BYTE_WIDTH;
-		break;
-	case DMA_SLAVE_BUSWIDTH_2_BYTES:
-		addr_width = STEDMA40_HALFWORD_WIDTH;
-		break;
-	case DMA_SLAVE_BUSWIDTH_4_BYTES:
-		addr_width = STEDMA40_WORD_WIDTH;
-		break;
-	case DMA_SLAVE_BUSWIDTH_8_BYTES:
-		addr_width = STEDMA40_DOUBLEWORD_WIDTH;
-		break;
-	default:
-		dev_err(d40c->base->dev,
-			"illegal peripheral address width "
-			"requested (%d)\n",
-			width);
-		return -EINVAL;
-	}
-
 	if (chan_is_logical(d40c)) {
 		if (maxburst >= 16)
 			psize = STEDMA40_PSIZE_LOG_16;
@@ -2722,7 +2705,6 @@ dma40_config_to_halfchannel(struct d40_chan *d40c,
 			psize = STEDMA40_PSIZE_PHY_1;
 	}
 
-	info->data_width = addr_width;
 	info->psize = psize;
 	info->flow_ctrl = STEDMA40_NO_FLOW_CTRL;
 
@@ -2748,12 +2730,12 @@ static int d40_set_runtime_config(struct dma_chan *chan,
 	if (config->direction == DMA_DEV_TO_MEM) {
 		config_addr = config->src_addr;
 
-		if (cfg->dir != STEDMA40_PERIPH_TO_MEM)
+		if (cfg->dir != DMA_DEV_TO_MEM)
 			dev_dbg(d40c->base->dev,
 				"channel was not configured for peripheral "
 				"to memory transfer (%d) overriding\n",
 				cfg->dir);
-		cfg->dir = STEDMA40_PERIPH_TO_MEM;
+		cfg->dir = DMA_DEV_TO_MEM;
 
 		/* Configure the memory side */
 		if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
@@ -2764,12 +2746,12 @@ static int d40_set_runtime_config(struct dma_chan *chan,
 	} else if (config->direction == DMA_MEM_TO_DEV) {
 		config_addr = config->dst_addr;
 
-		if (cfg->dir != STEDMA40_MEM_TO_PERIPH)
+		if (cfg->dir != DMA_MEM_TO_DEV)
 			dev_dbg(d40c->base->dev,
 				"channel was not configured for memory "
 				"to peripheral transfer (%d) overriding\n",
 				cfg->dir);
-		cfg->dir = STEDMA40_MEM_TO_PERIPH;
+		cfg->dir = DMA_MEM_TO_DEV;
 
 		/* Configure the memory side */
 		if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
@@ -2806,14 +2788,24 @@ static int d40_set_runtime_config(struct dma_chan *chan,
 		src_maxburst = dst_maxburst * dst_addr_width / src_addr_width;
 	}
 
+	/* Only valid widths are; 1, 2, 4 and 8. */
+	if (src_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
+	    src_addr_width >  DMA_SLAVE_BUSWIDTH_8_BYTES   ||
+	    dst_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
+	    dst_addr_width >  DMA_SLAVE_BUSWIDTH_8_BYTES   ||
+	    ((src_addr_width > 1) && (src_addr_width & 1)) ||
+	    ((dst_addr_width > 1) && (dst_addr_width & 1)))
+		return -EINVAL;
+
+	cfg->src_info.data_width = src_addr_width;
+	cfg->dst_info.data_width = dst_addr_width;
+
 	ret = dma40_config_to_halfchannel(d40c, &cfg->src_info,
-					  src_addr_width,
 					  src_maxburst);
 	if (ret)
 		return ret;
 
 	ret = dma40_config_to_halfchannel(d40c, &cfg->dst_info,
-					  dst_addr_width,
 					  dst_maxburst);
 	if (ret)
 		return ret;
@@ -2953,7 +2945,7 @@ static int __init d40_dmaengine_init(struct d40_base *base,
 	}
 
 	d40_chan_init(base, &base->dma_memcpy, base->log_chans,
-		      base->num_log_chans, ARRAY_SIZE(dma40_memcpy_channels));
+		      base->num_log_chans, base->num_memcpy_chans);
 
 	dma_cap_zero(base->dma_memcpy.cap_mask);
 	dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
@@ -3154,6 +3146,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
 	struct d40_base *base = NULL;
 	int num_log_chans = 0;
 	int num_phy_chans;
+	int num_memcpy_chans;
 	int clk_ret = -EINVAL;
 	int i;
 	u32 pid;
@@ -3224,6 +3217,12 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
 	else
 		num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
 
+	/* The number of channels used for memcpy */
+	if (plat_data->num_of_memcpy_chans)
+		num_memcpy_chans = plat_data->num_of_memcpy_chans;
+	else
+		num_memcpy_chans = ARRAY_SIZE(dma40_memcpy_channels);
+
 	num_log_chans = num_phy_chans * D40_MAX_LOG_CHAN_PER_PHY;
 
 	dev_info(&pdev->dev,
@@ -3231,7 +3230,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
 		 rev, res->start, num_phy_chans, num_log_chans);
 
 	base = kzalloc(ALIGN(sizeof(struct d40_base), 4) +
-		       (num_phy_chans + num_log_chans + ARRAY_SIZE(dma40_memcpy_channels)) *
+		       (num_phy_chans + num_log_chans + num_memcpy_chans) *
 		       sizeof(struct d40_chan), GFP_KERNEL);
 
 	if (base == NULL) {
@@ -3241,6 +3240,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
 
 	base->rev = rev;
 	base->clk = clk;
+	base->num_memcpy_chans = num_memcpy_chans;
 	base->num_phy_chans = num_phy_chans;
 	base->num_log_chans = num_log_chans;
 	base->phy_start = res->start;
@@ -3484,12 +3484,8 @@ static int __init d40_of_probe(struct platform_device *pdev,
 			       struct device_node *np)
 {
 	struct stedma40_platform_data *pdata;
-
-	/*
-	 * FIXME: Fill in this routine as more support is added.
-	 * First platform enabled (u8500) doens't need any extra
-	 * properties to run, so this is fairly sparce currently.
-	 */
+	int num_phy = 0, num_memcpy = 0, num_disabled = 0;
+	const const __be32 *list;
 
 	pdata = devm_kzalloc(&pdev->dev,
 			     sizeof(struct stedma40_platform_data),
@@ -3497,6 +3493,41 @@ static int __init d40_of_probe(struct platform_device *pdev,
 	if (!pdata)
 		return -ENOMEM;
 
+	/* If absent this value will be obtained from h/w. */
+	of_property_read_u32(np, "dma-channels", &num_phy);
+	if (num_phy > 0)
+		pdata->num_of_phy_chans = num_phy;
+
+	list = of_get_property(np, "memcpy-channels", &num_memcpy);
+	num_memcpy /= sizeof(*list);
+
+	if (num_memcpy > D40_MEMCPY_MAX_CHANS || num_memcpy <= 0) {
+		d40_err(&pdev->dev,
+			"Invalid number of memcpy channels specified (%d)\n",
+			num_memcpy);
+		return -EINVAL;
+	}
+	pdata->num_of_memcpy_chans = num_memcpy;
+
+	of_property_read_u32_array(np, "memcpy-channels",
+				   dma40_memcpy_channels,
+				   num_memcpy);
+
+	list = of_get_property(np, "disabled-channels", &num_disabled);
+	num_disabled /= sizeof(*list);
+
+	if (num_disabled > STEDMA40_MAX_PHYS || num_disabled < 0) {
+		d40_err(&pdev->dev,
+			"Invalid number of disabled channels specified (%d)\n",
+			num_disabled);
+		return -EINVAL;
+	}
+
+	of_property_read_u32_array(np, "disabled-channels",
+				   pdata->disabled_channels,
+				   num_disabled);
+	pdata->disabled_channels[num_disabled] = -1;
+
 	pdev->dev.platform_data = pdata;
 
 	return 0;
diff --git a/drivers/dma/ste_dma40_ll.c b/drivers/dma/ste_dma40_ll.c
index ab5a2a706f7a..27b818dee7c7 100644
--- a/drivers/dma/ste_dma40_ll.c
+++ b/drivers/dma/ste_dma40_ll.c
@@ -10,6 +10,18 @@
 
 #include "ste_dma40_ll.h"
 
+u8 d40_width_to_bits(enum dma_slave_buswidth width)
+{
+	if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
+		return STEDMA40_ESIZE_8_BIT;
+	else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
+		return STEDMA40_ESIZE_16_BIT;
+	else if (width == DMA_SLAVE_BUSWIDTH_8_BYTES)
+		return STEDMA40_ESIZE_64_BIT;
+	else
+		return STEDMA40_ESIZE_32_BIT;
+}
+
 /* Sets up proper LCSP1 and LCSP3 register for a logical channel */
 void d40_log_cfg(struct stedma40_chan_cfg *cfg,
 		 u32 *lcsp1, u32 *lcsp3)
@@ -18,32 +30,34 @@ void d40_log_cfg(struct stedma40_chan_cfg *cfg,
 	u32 l1 = 0; /* src */
 
 	/* src is mem? -> increase address pos */
-	if (cfg->dir ==  STEDMA40_MEM_TO_PERIPH ||
-	    cfg->dir ==  STEDMA40_MEM_TO_MEM)
-		l1 |= 1 << D40_MEM_LCSP1_SCFG_INCR_POS;
+	if (cfg->dir ==  DMA_MEM_TO_DEV ||
+	    cfg->dir ==  DMA_MEM_TO_MEM)
+		l1 |= BIT(D40_MEM_LCSP1_SCFG_INCR_POS);
 
 	/* dst is mem? -> increase address pos */
-	if (cfg->dir ==  STEDMA40_PERIPH_TO_MEM ||
-	    cfg->dir ==  STEDMA40_MEM_TO_MEM)
-		l3 |= 1 << D40_MEM_LCSP3_DCFG_INCR_POS;
+	if (cfg->dir ==  DMA_DEV_TO_MEM ||
+	    cfg->dir ==  DMA_MEM_TO_MEM)
+		l3 |= BIT(D40_MEM_LCSP3_DCFG_INCR_POS);
 
 	/* src is hw? -> master port 1 */
-	if (cfg->dir ==  STEDMA40_PERIPH_TO_MEM ||
-	    cfg->dir ==  STEDMA40_PERIPH_TO_PERIPH)
-		l1 |= 1 << D40_MEM_LCSP1_SCFG_MST_POS;
+	if (cfg->dir ==  DMA_DEV_TO_MEM ||
+	    cfg->dir ==  DMA_DEV_TO_DEV)
+		l1 |= BIT(D40_MEM_LCSP1_SCFG_MST_POS);
 
 	/* dst is hw? -> master port 1 */
-	if (cfg->dir ==  STEDMA40_MEM_TO_PERIPH ||
-	    cfg->dir ==  STEDMA40_PERIPH_TO_PERIPH)
-		l3 |= 1 << D40_MEM_LCSP3_DCFG_MST_POS;
+	if (cfg->dir ==  DMA_MEM_TO_DEV ||
+	    cfg->dir ==  DMA_DEV_TO_DEV)
+		l3 |= BIT(D40_MEM_LCSP3_DCFG_MST_POS);
 
-	l3 |= 1 << D40_MEM_LCSP3_DCFG_EIM_POS;
+	l3 |= BIT(D40_MEM_LCSP3_DCFG_EIM_POS);
 	l3 |= cfg->dst_info.psize << D40_MEM_LCSP3_DCFG_PSIZE_POS;
-	l3 |= cfg->dst_info.data_width << D40_MEM_LCSP3_DCFG_ESIZE_POS;
+	l3 |= d40_width_to_bits(cfg->dst_info.data_width)
+		<< D40_MEM_LCSP3_DCFG_ESIZE_POS;
 
-	l1 |= 1 << D40_MEM_LCSP1_SCFG_EIM_POS;
+	l1 |= BIT(D40_MEM_LCSP1_SCFG_EIM_POS);
 	l1 |= cfg->src_info.psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
-	l1 |= cfg->src_info.data_width << D40_MEM_LCSP1_SCFG_ESIZE_POS;
+	l1 |= d40_width_to_bits(cfg->src_info.data_width)
+		<< D40_MEM_LCSP1_SCFG_ESIZE_POS;
 
 	*lcsp1 = l1;
 	*lcsp3 = l3;
@@ -55,59 +69,61 @@ void d40_phy_cfg(struct stedma40_chan_cfg *cfg, u32 *src_cfg, u32 *dst_cfg)
 	u32 src = 0;
 	u32 dst = 0;
 
-	if ((cfg->dir ==  STEDMA40_PERIPH_TO_MEM) ||
-	    (cfg->dir == STEDMA40_PERIPH_TO_PERIPH)) {
+	if ((cfg->dir == DMA_DEV_TO_MEM) ||
+	    (cfg->dir == DMA_DEV_TO_DEV)) {
 		/* Set master port to 1 */
-		src |= 1 << D40_SREG_CFG_MST_POS;
+		src |= BIT(D40_SREG_CFG_MST_POS);
 		src |= D40_TYPE_TO_EVENT(cfg->dev_type);
 
 		if (cfg->src_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
-			src |= 1 << D40_SREG_CFG_PHY_TM_POS;
+			src |= BIT(D40_SREG_CFG_PHY_TM_POS);
 		else
 			src |= 3 << D40_SREG_CFG_PHY_TM_POS;
 	}
-	if ((cfg->dir ==  STEDMA40_MEM_TO_PERIPH) ||
-	    (cfg->dir == STEDMA40_PERIPH_TO_PERIPH)) {
+	if ((cfg->dir == DMA_MEM_TO_DEV) ||
+	    (cfg->dir == DMA_DEV_TO_DEV)) {
 		/* Set master port to 1 */
-		dst |= 1 << D40_SREG_CFG_MST_POS;
+		dst |= BIT(D40_SREG_CFG_MST_POS);
 		dst |= D40_TYPE_TO_EVENT(cfg->dev_type);
 
 		if (cfg->dst_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
-			dst |= 1 << D40_SREG_CFG_PHY_TM_POS;
+			dst |= BIT(D40_SREG_CFG_PHY_TM_POS);
 		else
 			dst |= 3 << D40_SREG_CFG_PHY_TM_POS;
 	}
 	/* Interrupt on end of transfer for destination */
-	dst |= 1 << D40_SREG_CFG_TIM_POS;
+	dst |= BIT(D40_SREG_CFG_TIM_POS);
 
 	/* Generate interrupt on error */
-	src |= 1 << D40_SREG_CFG_EIM_POS;
-	dst |= 1 << D40_SREG_CFG_EIM_POS;
+	src |= BIT(D40_SREG_CFG_EIM_POS);
+	dst |= BIT(D40_SREG_CFG_EIM_POS);
 
 	/* PSIZE */
 	if (cfg->src_info.psize != STEDMA40_PSIZE_PHY_1) {
-		src |= 1 << D40_SREG_CFG_PHY_PEN_POS;
+		src |= BIT(D40_SREG_CFG_PHY_PEN_POS);
 		src |= cfg->src_info.psize << D40_SREG_CFG_PSIZE_POS;
 	}
 	if (cfg->dst_info.psize != STEDMA40_PSIZE_PHY_1) {
-		dst |= 1 << D40_SREG_CFG_PHY_PEN_POS;
+		dst |= BIT(D40_SREG_CFG_PHY_PEN_POS);
 		dst |= cfg->dst_info.psize << D40_SREG_CFG_PSIZE_POS;
 	}
 
 	/* Element size */
-	src |= cfg->src_info.data_width << D40_SREG_CFG_ESIZE_POS;
-	dst |= cfg->dst_info.data_width << D40_SREG_CFG_ESIZE_POS;
+	src |= d40_width_to_bits(cfg->src_info.data_width)
+		<< D40_SREG_CFG_ESIZE_POS;
+	dst |= d40_width_to_bits(cfg->dst_info.data_width)
+		<< D40_SREG_CFG_ESIZE_POS;
 
 	/* Set the priority bit to high for the physical channel */
 	if (cfg->high_priority) {
-		src |= 1 << D40_SREG_CFG_PRI_POS;
-		dst |= 1 << D40_SREG_CFG_PRI_POS;
+		src |= BIT(D40_SREG_CFG_PRI_POS);
+		dst |= BIT(D40_SREG_CFG_PRI_POS);
 	}
 
 	if (cfg->src_info.big_endian)
-		src |= 1 << D40_SREG_CFG_LBE_POS;
+		src |= BIT(D40_SREG_CFG_LBE_POS);
 	if (cfg->dst_info.big_endian)
-		dst |= 1 << D40_SREG_CFG_LBE_POS;
+		dst |= BIT(D40_SREG_CFG_LBE_POS);
 
 	*src_cfg = src;
 	*dst_cfg = dst;
@@ -133,23 +149,22 @@ static int d40_phy_fill_lli(struct d40_phy_lli *lli,
 		num_elems = 2 << psize;
 
 	/* Must be aligned */
-	if (!IS_ALIGNED(data, 0x1 << data_width))
+	if (!IS_ALIGNED(data, data_width))
 		return -EINVAL;
 
 	/* Transfer size can't be smaller than (num_elms * elem_size) */
-	if (data_size < num_elems * (0x1 << data_width))
+	if (data_size < num_elems * data_width)
 		return -EINVAL;
 
 	/* The number of elements. IE now many chunks */
-	lli->reg_elt = (data_size >> data_width) << D40_SREG_ELEM_PHY_ECNT_POS;
+	lli->reg_elt = (data_size / data_width) << D40_SREG_ELEM_PHY_ECNT_POS;
 
 	/*
 	 * Distance to next element sized entry.
 	 * Usually the size of the element unless you want gaps.
 	 */
 	if (addr_inc)
-		lli->reg_elt |= (0x1 << data_width) <<
-			D40_SREG_ELEM_PHY_EIDX_POS;
+		lli->reg_elt |= data_width << D40_SREG_ELEM_PHY_EIDX_POS;
 
 	/* Where the data is */
 	lli->reg_ptr = data;
@@ -157,18 +172,20 @@ static int d40_phy_fill_lli(struct d40_phy_lli *lli,
 
 	/* If this scatter list entry is the last one, no next link */
 	if (next_lli == 0)
-		lli->reg_lnk = 0x1 << D40_SREG_LNK_PHY_TCP_POS;
+		lli->reg_lnk = BIT(D40_SREG_LNK_PHY_TCP_POS);
 	else
 		lli->reg_lnk = next_lli;
 
 	/* Set/clear interrupt generation on this link item.*/
 	if (term_int)
-		lli->reg_cfg |= 0x1 << D40_SREG_CFG_TIM_POS;
+		lli->reg_cfg |= BIT(D40_SREG_CFG_TIM_POS);
 	else
-		lli->reg_cfg &= ~(0x1 << D40_SREG_CFG_TIM_POS);
+		lli->reg_cfg &= ~BIT(D40_SREG_CFG_TIM_POS);
 
-	/* Post link */
-	lli->reg_lnk |= 0 << D40_SREG_LNK_PHY_PRE_POS;
+	/*
+	 * Post link - D40_SREG_LNK_PHY_PRE_POS = 0
+	 * Relink happens after transfer completion.
+	 */
 
 	return 0;
 }
@@ -177,16 +194,16 @@ static int d40_seg_size(int size, int data_width1, int data_width2)
 {
 	u32 max_w = max(data_width1, data_width2);
 	u32 min_w = min(data_width1, data_width2);
-	u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE << min_w, 1 << max_w);
+	u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w);
 
 	if (seg_max > STEDMA40_MAX_SEG_SIZE)
-		seg_max -= (1 << max_w);
+		seg_max -= max_w;
 
 	if (size <= seg_max)
 		return size;
 
 	if (size <= 2 * seg_max)
-		return ALIGN(size / 2, 1 << max_w);
+		return ALIGN(size / 2, max_w);
 
 	return seg_max;
 }
@@ -352,10 +369,10 @@ static void d40_log_fill_lli(struct d40_log_lli *lli,
 	lli->lcsp13 = reg_cfg;
 
 	/* The number of elements to transfer */
-	lli->lcsp02 = ((data_size >> data_width) <<
+	lli->lcsp02 = ((data_size / data_width) <<
 		       D40_MEM_LCSP0_ECNT_POS) & D40_MEM_LCSP0_ECNT_MASK;
 
-	BUG_ON((data_size >> data_width) > STEDMA40_MAX_SEG_SIZE);
+	BUG_ON((data_size / data_width) > STEDMA40_MAX_SEG_SIZE);
 
 	/* 16 LSBs address of the current element */
 	lli->lcsp02 |= data & D40_MEM_LCSP0_SPTR_MASK;
diff --git a/drivers/usb/musb/ux500.c b/drivers/usb/musb/ux500.c
index 2c80004e0a83..f0beee7b868e 100644
--- a/drivers/usb/musb/ux500.c
+++ b/drivers/usb/musb/ux500.c
@@ -25,11 +25,19 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/usb/musb-ux500.h>
 
 #include "musb_core.h"
 
+static struct musb_hdrc_config ux500_musb_hdrc_config = {
+	.multipoint	= true,
+	.dyn_fifo	= true,
+	.num_eps	= 16,
+	.ram_bits	= 16,
+};
+
 struct ux500_glue {
 	struct device		*dev;
 	struct platform_device	*musb;
@@ -187,14 +195,57 @@ static const struct musb_platform_ops ux500_ops = {
 	.set_vbus	= ux500_musb_set_vbus,
 };
 
+static struct musb_hdrc_platform_data *
+ux500_of_probe(struct platform_device *pdev, struct device_node *np)
+{
+	struct musb_hdrc_platform_data *pdata;
+	const char *mode;
+	int strlen;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return NULL;
+
+	mode = of_get_property(np, "dr_mode", &strlen);
+	if (!mode) {
+		dev_err(&pdev->dev, "No 'dr_mode' property found\n");
+		return NULL;
+	}
+
+	if (strlen > 0) {
+		if (!strcmp(mode, "host"))
+			pdata->mode = MUSB_HOST;
+		if (!strcmp(mode, "otg"))
+			pdata->mode = MUSB_OTG;
+		if (!strcmp(mode, "peripheral"))
+			pdata->mode = MUSB_PERIPHERAL;
+	}
+
+	return pdata;
+}
+
 static int ux500_probe(struct platform_device *pdev)
 {
 	struct musb_hdrc_platform_data	*pdata = pdev->dev.platform_data;
+	struct device_node		*np = pdev->dev.of_node;
 	struct platform_device		*musb;
 	struct ux500_glue		*glue;
 	struct clk			*clk;
 	int				ret = -ENOMEM;
 
+	if (!pdata) {
+		if (np) {
+			pdata = ux500_of_probe(pdev, np);
+			if (!pdata)
+				goto err0;
+
+			pdev->dev.platform_data = pdata;
+		} else {
+			dev_err(&pdev->dev, "no pdata or device tree found\n");
+			goto err0;
+		}
+	}
+
 	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
 	if (!glue) {
 		dev_err(&pdev->dev, "failed to allocate glue context\n");
@@ -221,14 +272,16 @@ static int ux500_probe(struct platform_device *pdev)
 	}
 
 	musb->dev.parent		= &pdev->dev;
-	musb->dev.dma_mask		= pdev->dev.dma_mask;
+	musb->dev.dma_mask		= &pdev->dev.coherent_dma_mask;
 	musb->dev.coherent_dma_mask	= pdev->dev.coherent_dma_mask;
+	musb->dev.of_node		= pdev->dev.of_node;
 
 	glue->dev			= &pdev->dev;
 	glue->musb			= musb;
 	glue->clk			= clk;
 
 	pdata->platform_ops		= &ux500_ops;
+	pdata->config 			= &ux500_musb_hdrc_config;
 
 	platform_set_drvdata(pdev, glue);
 
@@ -320,12 +373,18 @@ static const struct dev_pm_ops ux500_pm_ops = {
 #define DEV_PM_OPS	NULL
 #endif
 
+static const struct of_device_id ux500_match[] = {
+        { .compatible = "stericsson,db8500-musb", },
+        {}
+};
+
 static struct platform_driver ux500_driver = {
 	.probe		= ux500_probe,
 	.remove		= ux500_remove,
 	.driver		= {
 		.name	= "musb-ux500",
 		.pm	= DEV_PM_OPS,
+		.of_match_table = ux500_match,
 	},
 };
 
diff --git a/drivers/usb/musb/ux500_dma.c b/drivers/usb/musb/ux500_dma.c
index 338120641145..7d80699a5ff7 100644
--- a/drivers/usb/musb/ux500_dma.c
+++ b/drivers/usb/musb/ux500_dma.c
@@ -34,6 +34,11 @@
 #include <linux/platform_data/usb-musb-ux500.h>
 #include "musb_core.h"
 
+static const char *iep_chan_names[] = { "iep_1_9", "iep_2_10", "iep_3_11", "iep_4_12",
+					"iep_5_13", "iep_6_14", "iep_7_15", "iep_8" };
+static const char *oep_chan_names[] = { "oep_1_9", "oep_2_10", "oep_3_11", "oep_4_12",
+					"oep_5_13", "oep_6_14", "oep_7_15", "oep_8" };
+
 struct ux500_dma_channel {
 	struct dma_channel channel;
 	struct ux500_dma_controller *controller;
@@ -48,10 +53,8 @@ struct ux500_dma_channel {
 
 struct ux500_dma_controller {
 	struct dma_controller controller;
-	struct ux500_dma_channel rx_channel[UX500_MUSB_DMA_NUM_RX_CHANNELS];
-	struct ux500_dma_channel tx_channel[UX500_MUSB_DMA_NUM_TX_CHANNELS];
-	u32	num_rx_channels;
-	u32	num_tx_channels;
+	struct ux500_dma_channel rx_channel[UX500_MUSB_DMA_NUM_RX_TX_CHANNELS];
+	struct ux500_dma_channel tx_channel[UX500_MUSB_DMA_NUM_RX_TX_CHANNELS];
 	void *private_data;
 	dma_addr_t phy_base;
 };
@@ -144,19 +147,15 @@ static struct dma_channel *ux500_dma_channel_allocate(struct dma_controller *c,
 	struct ux500_dma_channel *ux500_channel = NULL;
 	struct musb *musb = controller->private_data;
 	u8 ch_num = hw_ep->epnum - 1;
-	u32 max_ch;
 
-	/* Max 8 DMA channels (0 - 7). Each DMA channel can only be allocated
+	/* 8 DMA channels (0 - 7). Each DMA channel can only be allocated
 	 * to specified hw_ep. For example DMA channel 0 can only be allocated
 	 * to hw_ep 1 and 9.
 	 */
 	if (ch_num > 7)
 		ch_num -= 8;
 
-	max_ch = is_tx ? controller->num_tx_channels :
-			controller->num_rx_channels;
-
-	if (ch_num >= max_ch)
+	if (ch_num >= UX500_MUSB_DMA_NUM_RX_TX_CHANNELS)
 		return NULL;
 
 	ux500_channel = is_tx ? &(controller->tx_channel[ch_num]) :
@@ -264,7 +263,7 @@ static int ux500_dma_controller_stop(struct dma_controller *c)
 	struct dma_channel *channel;
 	u8 ch_num;
 
-	for (ch_num = 0; ch_num < controller->num_rx_channels; ch_num++) {
+	for (ch_num = 0; ch_num < UX500_MUSB_DMA_NUM_RX_TX_CHANNELS; ch_num++) {
 		channel = &controller->rx_channel[ch_num].channel;
 		ux500_channel = channel->private_data;
 
@@ -274,7 +273,7 @@ static int ux500_dma_controller_stop(struct dma_controller *c)
 			dma_release_channel(ux500_channel->dma_chan);
 	}
 
-	for (ch_num = 0; ch_num < controller->num_tx_channels; ch_num++) {
+	for (ch_num = 0; ch_num < UX500_MUSB_DMA_NUM_RX_TX_CHANNELS; ch_num++) {
 		channel = &controller->tx_channel[ch_num].channel;
 		ux500_channel = channel->private_data;
 
@@ -295,34 +294,36 @@ static int ux500_dma_controller_start(struct dma_controller *c)
 	struct musb *musb = controller->private_data;
 	struct device *dev = musb->controller;
 	struct musb_hdrc_platform_data *plat = dev->platform_data;
-	struct ux500_musb_board_data *data = plat->board_data;
+	struct ux500_musb_board_data *data;
 	struct dma_channel *dma_channel = NULL;
+	char **chan_names;
 	u32 ch_num;
 	u8 dir;
 	u8 is_tx = 0;
 
 	void **param_array;
 	struct ux500_dma_channel *channel_array;
-	u32 ch_count;
 	dma_cap_mask_t mask;
 
-	if ((data->num_rx_channels > UX500_MUSB_DMA_NUM_RX_CHANNELS) ||
-		(data->num_tx_channels > UX500_MUSB_DMA_NUM_TX_CHANNELS))
+	if (!plat) {
+		dev_err(musb->controller, "No platform data\n");
 		return -EINVAL;
+	}
 
-	controller->num_rx_channels = data->num_rx_channels;
-	controller->num_tx_channels = data->num_tx_channels;
+	data = plat->board_data;
 
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
 	/* Prepare the loop for RX channels */
 	channel_array = controller->rx_channel;
-	ch_count = data->num_rx_channels;
-	param_array = data->dma_rx_param_array;
+	param_array = data ? data->dma_rx_param_array : NULL;
+	chan_names = (char **)iep_chan_names;
 
 	for (dir = 0; dir < 2; dir++) {
-		for (ch_num = 0; ch_num < ch_count; ch_num++) {
+		for (ch_num = 0;
+		     ch_num < UX500_MUSB_DMA_NUM_RX_TX_CHANNELS;
+		     ch_num++) {
 			ux500_channel = &channel_array[ch_num];
 			ux500_channel->controller = controller;
 			ux500_channel->ch_num = ch_num;
@@ -333,9 +334,15 @@ static int ux500_dma_controller_start(struct dma_controller *c)
 			dma_channel->status = MUSB_DMA_STATUS_FREE;
 			dma_channel->max_len = SZ_16M;
 
-			ux500_channel->dma_chan = dma_request_channel(mask,
-							data->dma_filter,
-							param_array[ch_num]);
+			ux500_channel->dma_chan =
+				dma_request_slave_channel(dev, chan_names[ch_num]);
+
+			if (!ux500_channel->dma_chan)
+				ux500_channel->dma_chan =
+					dma_request_channel(mask,
+							    data->dma_filter,
+							    param_array[ch_num]);
+
 			if (!ux500_channel->dma_chan) {
 				ERR("Dma pipe allocation error dir=%d ch=%d\n",
 					dir, ch_num);
@@ -350,8 +357,8 @@ static int ux500_dma_controller_start(struct dma_controller *c)
 
 		/* Prepare the loop for TX channels */
 		channel_array = controller->tx_channel;
-		ch_count = data->num_tx_channels;
-		param_array = data->dma_tx_param_array;
+		param_array = data ? data->dma_tx_param_array : NULL;
+		chan_names = (char **)oep_chan_names;
 		is_tx = 1;
 	}