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t210: Correct dma_busy function 

In case of continuous mode, use STA_ACTIVITY bit to determine if DMA
operation is complete. However, in case of ONCE mode, use STA_BSY bit
to determine if DMA operation on the channel is complete.

BUG=chrome-os-partner:41877
BRANCH=None
TEST=Compiles successfully and reboot test runs fine for 10K+ iterations

Change-Id: If98f195481b18c402bd9cac353080c317e0e1168
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 927026db6fd910dac32dc218f28efcbc7b788b4e
Original-Change-Id: Ib66bedfb413f948728a4f9cffce9d9c3feb0bfda
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/285140
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Original-Trybot-Ready: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/10946
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Furquan Shaikh 2015-07-13 09:48:52 -07:00 committed by Patrick Georgi
parent e431ab9c84
commit fe48f0941e
1 changed files with 14 additions and 2 deletions
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16
src/soc/nvidia/tegra210/dma.c
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@ -69,9 +69,21 @@ int dma_busy(struct apb_dma_channel * const channel)
* In continuous mode, the BSY_n bit in APB_DMA_STATUS and
* BSY in APBDMACHAN_CHANNEL_n_STA_0 will remain set as '1' so long
* as the channel is enabled. So for this function we'll use the
* DMA_ACTIVITY bit.
* DMA_ACTIVITY bit in case of continuous mode.
*
* However, for ONCE mode, the BSY_n bit in APB_DMA_STATUS will be used
* to determine end of dma operation.
*/
return read32(&channel->regs->sta) & APB_STA_DMA_ACTIVITY ? 1 : 0;
uint32_t bit;
if (read32(&channel->regs->csr) & APB_CSR_ONCE)
/* Once mode */
bit = APB_STA_BSY;
else
/* Continuous mode */
bit = APB_STA_DMA_ACTIVITY;
return read32(&channel->regs->sta) & bit ? 1 : 0;
}
/* claim a DMA channel */
struct apb_dma_channel * const dma_claim(void)