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authorMike Frysinger <vapier.adi@gmail.com>2009-04-07 06:00:38 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 19:31:05 +0400
commitd24bd1d0dc850e7aa68c27ec288eb699d41a5916 (patch)
tree5360f0b6f43a5581ccc4dc7dbf5c36e93d734ba0 /drivers/spi
parent59bfcc664859029f60269ca2bf05b310d5a5760b (diff)
downloadlinux-d24bd1d0dc850e7aa68c27ec288eb699d41a5916.tar.xz
Blackfin SPI Driver: add a few more DMA debug messages
Because of DMA hardware issue, we were trying to use software workaround. This patch add some useful debug messages to help us debugging the DMA code. Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi_bfin5xx.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 0bbe19eafc26..5acec9ff0175 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -559,9 +559,13 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
struct driver_data *drv_data = dev_id;
struct chip_data *chip = drv_data->cur_chip;
struct spi_message *msg = drv_data->cur_msg;
+ unsigned short dmastat = get_dma_curr_irqstat(drv_data->dma_channel);
u16 spistat = read_STAT(drv_data);
- dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler\n");
+ dev_dbg(&drv_data->pdev->dev,
+ "in dma_irq_handler dmastat:0x%x spistat:0x%x\n",
+ dmastat, spistat);
+
clear_dma_irqstat(drv_data->dma_channel);
/* Wait for DMA to complete */
@@ -631,6 +635,7 @@ static void pump_transfers(unsigned long data)
/* Handle for abort */
if (message->state == ERROR_STATE) {
+ dev_dbg(&drv_data->pdev->dev, "transfer: we've hit an error\n");
message->status = -EIO;
giveback(drv_data);
return;
@@ -638,6 +643,7 @@ static void pump_transfers(unsigned long data)
/* Handle end of message */
if (message->state == DONE_STATE) {
+ dev_dbg(&drv_data->pdev->dev, "transfer: all done!\n");
message->status = 0;
giveback(drv_data);
return;
@@ -645,6 +651,7 @@ static void pump_transfers(unsigned long data)
/* Delay if requested at end of transfer */
if (message->state == RUNNING_STATE) {
+ dev_dbg(&drv_data->pdev->dev, "transfer: still running ...\n");
previous = list_entry(transfer->transfer_list.prev,
struct spi_transfer, transfer_list);
if (previous->delay_usecs)
@@ -806,7 +813,8 @@ static void pump_transfers(unsigned long data)
dma_config = (RESTART | dma_width | DI_EN);
if (drv_data->rx != NULL) {
/* set transfer mode, and enable SPI */
- dev_dbg(&drv_data->pdev->dev, "doing DMA in.\n");
+ dev_dbg(&drv_data->pdev->dev, "doing DMA in to %p (size %zx)\n",
+ drv_data->rx, drv_data->len_in_bytes);
/* invalidate caches, if needed */
if (bfin_addr_dcachable((unsigned long) drv_data->rx))