1 files changed, 33 insertions, 26 deletions

diff --git a/drivers/usb/musb/ux500_dma.c b/drivers/usb/musb/ux500_dma.c
index 63e7c8a6b125..bfb7a65d83cc 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;
 };
@@ -143,19 +146,15 @@ 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]) :
@@ -263,7 +262,7 @@ 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;
 
@@ -273,7 +272,7 @@ 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;
 
@@ -294,34 +293,36 @@ 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;
@@ -332,9 +333,15 @@ 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);
@@ -349,8 +356,8 @@ 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;
 	}