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authorLee Jones <lee.jones@linaro.org>2013-05-15 10:51:47 +0100
committerLinus Walleij <linus.walleij@linaro.org>2013-06-04 11:12:04 +0200
commit2968da0b2c7297a29d49c7084d6865c2cf627093 (patch)
tree4f817cfe3d4f124abcd12288bce7c1e0b90f4639 /drivers/usb/musb/ux500_dma.c
parent5f6091a023ca435c49467348e388fa89e635436a (diff)
usb: musb: ux500: attempt to find channels by name before using pdata
If we can ever get to a state where we can solely search for DMA channels by name, this will almost completely alleviate the requirement to pass copious amounts of information though platform data. Here we take the first step towards this. The next step will be to enable Device Tree complete with name<->event_line mapping. 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>
Diffstat (limited to 'drivers/usb/musb/ux500_dma.c')
-rw-r--r--drivers/usb/musb/ux500_dma.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/usb/musb/ux500_dma.c b/drivers/usb/musb/ux500_dma.c
index 4bd5400e0395..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;
@@ -291,6 +296,7 @@ static int ux500_dma_controller_start(struct dma_controller *c)
struct musb_hdrc_platform_data *plat = dev->platform_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;
@@ -312,6 +318,7 @@ static int ux500_dma_controller_start(struct dma_controller *c)
/* Prepare the loop for RX channels */
channel_array = controller->rx_channel;
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;
@@ -327,9 +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);
@@ -345,6 +358,7 @@ static int ux500_dma_controller_start(struct dma_controller *c)
/* Prepare the loop for TX channels */
channel_array = controller->tx_channel;
param_array = data ? data->dma_tx_param_array : NULL;
+ chan_names = (char **)oep_chan_names;
is_tx = 1;
}

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