usb: musb: ux500: move channel number knowledge into the driver

For all ux500 based platforms the maximum number of end-points are used.
Move this knowledge into the driver so we can relinquish the burden from
platform data. This also removes quite a bit of complexity from the driver
and will aid us when we come to enable the driver for Device Tree.

Cc: linux-usb@vger.kernel.org
Acked-by: Felipe Balbi <balbi@ti.com>
Acked-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 16 insertions, 33 deletions

diff --git a/arch/arm/mach-ux500/usb.c b/arch/arm/mach-ux500/usb.c
index 72754e369417..a21c2e1b7333 100644
--- a/arch/arm/mach-ux500/usb.c
+++ b/arch/arm/mach-ux500/usb.c
@@ -22,7 +22,7 @@
                 .dir = STEDMA40_MEM_TO_PERIPH, \
         }
 
-static struct stedma40_chan_cfg musb_dma_rx_ch[UX500_MUSB_DMA_NUM_RX_CHANNELS]
+static struct stedma40_chan_cfg musb_dma_rx_ch[UX500_MUSB_DMA_NUM_RX_TX_CHANNELS]
         = {
         MUSB_DMA40_RX_CH,
         MUSB_DMA40_RX_CH,
@@ -34,7 +34,7 @@ static struct stedma40_chan_cfg musb_dma_rx_ch[UX500_MUSB_DMA_NUM_RX_CHANNELS]
         MUSB_DMA40_RX_CH
 };
 
-static struct stedma40_chan_cfg musb_dma_tx_ch[UX500_MUSB_DMA_NUM_TX_CHANNELS]
+static struct stedma40_chan_cfg musb_dma_tx_ch[UX500_MUSB_DMA_NUM_RX_TX_CHANNELS]
         = {
         MUSB_DMA40_TX_CH,
         MUSB_DMA40_TX_CH,
@@ -46,7 +46,7 @@ static struct stedma40_chan_cfg musb_dma_tx_ch[UX500_MUSB_DMA_NUM_TX_CHANNELS]
         MUSB_DMA40_TX_CH,
 };
 
-static void *ux500_dma_rx_param_array[UX500_MUSB_DMA_NUM_RX_CHANNELS] = {
+static void *ux500_dma_rx_param_array[UX500_MUSB_DMA_NUM_RX_TX_CHANNELS] = {
         &musb_dma_rx_ch[0],
         &musb_dma_rx_ch[1],
         &musb_dma_rx_ch[2],
@@ -57,7 +57,7 @@ static void *ux500_dma_rx_param_array[UX500_MUSB_DMA_NUM_RX_CHANNELS] = {
         &musb_dma_rx_ch[7]
 };
 
-static void *ux500_dma_tx_param_array[UX500_MUSB_DMA_NUM_TX_CHANNELS] = {
+static void *ux500_dma_tx_param_array[UX500_MUSB_DMA_NUM_RX_TX_CHANNELS] = {
         &musb_dma_tx_ch[0],
         &musb_dma_tx_ch[1],
         &musb_dma_tx_ch[2],
@@ -71,8 +71,6 @@ static void *ux500_dma_tx_param_array[UX500_MUSB_DMA_NUM_TX_CHANNELS] = {
 static struct ux500_musb_board_data musb_board_data = {
         .dma_rx_param_array = ux500_dma_rx_param_array,
         .dma_tx_param_array = ux500_dma_tx_param_array,
-        .num_rx_channels = UX500_MUSB_DMA_NUM_RX_CHANNELS,
-        .num_tx_channels = UX500_MUSB_DMA_NUM_TX_CHANNELS,
         .dma_filter = stedma40_filter,
 };
 
@@ -119,7 +117,7 @@ static inline void ux500_usb_dma_update_rx_ch_config(int *dev_type)
 {
         u32 idx;
 
-        for (idx = 0; idx < UX500_MUSB_DMA_NUM_RX_CHANNELS; idx++)
+        for (idx = 0; idx < UX500_MUSB_DMA_NUM_RX_TX_CHANNELS; idx++)
                 musb_dma_rx_ch[idx].dev_type = dev_type[idx];
 }
 
@@ -127,7 +125,7 @@ static inline void ux500_usb_dma_update_tx_ch_config(int *dev_type)
 {
         u32 idx;
 
-        for (idx = 0; idx < UX500_MUSB_DMA_NUM_TX_CHANNELS; idx++)
+        for (idx = 0; idx < UX500_MUSB_DMA_NUM_RX_TX_CHANNELS; idx++)
                 musb_dma_tx_ch[idx].dev_type = dev_type[idx];
 }
 
diff --git a/drivers/usb/musb/ux500_dma.c b/drivers/usb/musb/ux500_dma.c
index 338120641145..382291b91f7b 100644
--- a/drivers/usb/musb/ux500_dma.c
+++ b/drivers/usb/musb/ux500_dma.c
@@ -48,10 +48,8 @@ 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 +142,15 @@ 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 +258,7 @@ 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 +268,7 @@ 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;
 
@@ -303,26 +297,21 @@ static int ux500_dma_controller_start(struct dma_controller *c)
 
         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))
-                return -EINVAL;
 
-        controller->num_rx_channels = data->num_rx_channels;
-        controller->num_tx_channels = data->num_tx_channels;
 
         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;
 
         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;
@@ -350,7 +339,6 @@ 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;
                 is_tx = 1;
         }
diff --git a/include/linux/platform_data/usb-musb-ux500.h b/include/linux/platform_data/usb-musb-ux500.h
index 4c1cc50a595a..dd9c83ac7de0 100644
--- a/include/linux/platform_data/usb-musb-ux500.h
+++ b/include/linux/platform_data/usb-musb-ux500.h
@@ -9,14 +9,11 @@
 
 #include <linux/dmaengine.h>
 
-#define UX500_MUSB_DMA_NUM_RX_CHANNELS 8
-#define UX500_MUSB_DMA_NUM_TX_CHANNELS 8
+#define UX500_MUSB_DMA_NUM_RX_TX_CHANNELS 8
 
 struct ux500_musb_board_data {
         void    **dma_rx_param_array;
         void    **dma_tx_param_array;
-        u32     num_rx_channels;
-        u32     num_tx_channels;
         bool (*dma_filter)(struct dma_chan *chan, void *filter_param);
 };