mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
dmaengine: qcom: bam_dma: add controlled-remotely dt property
Some of the peripherals has bam which is controlled by remote processor, thus the bam dma driver must avoid register writes which initialise bam hw block. Those registers are protected from xPU block and any writes to them will lead to secure violation and system reboot. Adding the contolled_remotely flag in bam driver to avoid not permitted register writes in bam_init function. Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org> Reviewed-by: Andy Gross <andy.gross@linaro.org> Tested-by: Pramod Gurav <gpramod@codeaurora.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
parent
c778ed46e6
commit
5172c9eb89
1 changed files with 7 additions and 0 deletions
|
@ -387,6 +387,7 @@ struct bam_device {
|
|||
|
||||
/* execution environment ID, from DT */
|
||||
u32 ee;
|
||||
bool controlled_remotely;
|
||||
|
||||
const struct reg_offset_data *layout;
|
||||
|
||||
|
@ -1042,6 +1043,9 @@ static int bam_init(struct bam_device *bdev)
|
|||
val = readl_relaxed(bam_addr(bdev, 0, BAM_NUM_PIPES));
|
||||
bdev->num_channels = val & BAM_NUM_PIPES_MASK;
|
||||
|
||||
if (bdev->controlled_remotely)
|
||||
return 0;
|
||||
|
||||
/* s/w reset bam */
|
||||
/* after reset all pipes are disabled and idle */
|
||||
val = readl_relaxed(bam_addr(bdev, 0, BAM_CTRL));
|
||||
|
@ -1129,6 +1133,9 @@ static int bam_dma_probe(struct platform_device *pdev)
|
|||
return ret;
|
||||
}
|
||||
|
||||
bdev->controlled_remotely = of_property_read_bool(pdev->dev.of_node,
|
||||
"qcom,controlled-remotely");
|
||||
|
||||
bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");
|
||||
if (IS_ERR(bdev->bamclk))
|
||||
return PTR_ERR(bdev->bamclk);
|
||||
|
|
Loading…
Reference in a new issue