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authorDinh Nguyen <dinguyen@kernel.org>2019-06-11 18:34:33 +0300
committerVinod Koul <vkoul@kernel.org>2019-06-14 08:55:47 +0300
commit0eaab70a7a1b70ec39e61817553321b3bc638156 (patch)
treefcef00a14c656aa7885d354d5db2830f26e3847f /drivers/dma/pl330.c
parent0ed91bded307cc980f9542eff861266f1744c303 (diff)
downloadlinux-0eaab70a7a1b70ec39e61817553321b3bc638156.tar.xz
dmagengine: pl330: add code to get reset property
The DMA controller on some SoCs can be held in reset, and thus requires the reset signal(s) to deasserted. Most SoCs will have just one reset signal, but there are others, i.e. Arria10/Stratix10 will have an additional reset signal, referred to as the OCP. Add code to get the reset property from the device tree for deassert and assert. Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/pl330.c')
-rw-r--r--drivers/dma/pl330.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 6e6837214210..5208c6a80a39 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -29,6 +29,7 @@
#include <linux/err.h>
#include <linux/pm_runtime.h>
#include <linux/bug.h>
+#include <linux/reset.h>
#include "dmaengine.h"
#define PL330_MAX_CHAN 8
@@ -500,6 +501,9 @@ struct pl330_dmac {
unsigned int num_peripherals;
struct dma_pl330_chan *peripherals; /* keep at end */
int quirks;
+
+ struct reset_control *rstc;
+ struct reset_control *rstc_ocp;
};
static struct pl330_of_quirks {
@@ -3028,6 +3032,32 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
amba_set_drvdata(adev, pl330);
+ pl330->rstc = devm_reset_control_get_optional(&adev->dev, "dma");
+ if (IS_ERR(pl330->rstc)) {
+ if (PTR_ERR(pl330->rstc) != -EPROBE_DEFER)
+ dev_err(&adev->dev, "Failed to get reset!\n");
+ return PTR_ERR(pl330->rstc);
+ } else {
+ ret = reset_control_deassert(pl330->rstc);
+ if (ret) {
+ dev_err(&adev->dev, "Couldn't deassert the device from reset!\n");
+ return ret;
+ }
+ }
+
+ pl330->rstc_ocp = devm_reset_control_get_optional(&adev->dev, "dma-ocp");
+ if (IS_ERR(pl330->rstc_ocp)) {
+ if (PTR_ERR(pl330->rstc_ocp) != -EPROBE_DEFER)
+ dev_err(&adev->dev, "Failed to get OCP reset!\n");
+ return PTR_ERR(pl330->rstc_ocp);
+ } else {
+ ret = reset_control_deassert(pl330->rstc_ocp);
+ if (ret) {
+ dev_err(&adev->dev, "Couldn't deassert the device from OCP reset!\n");
+ return ret;
+ }
+ }
+
for (i = 0; i < AMBA_NR_IRQS; i++) {
irq = adev->irq[i];
if (irq) {
@@ -3168,6 +3198,11 @@ probe_err3:
probe_err2:
pl330_del(pl330);
+ if (pl330->rstc_ocp)
+ reset_control_assert(pl330->rstc_ocp);
+
+ if (pl330->rstc)
+ reset_control_assert(pl330->rstc);
return ret;
}
@@ -3206,6 +3241,11 @@ static int pl330_remove(struct amba_device *adev)
pl330_del(pl330);
+ if (pl330->rstc_ocp)
+ reset_control_assert(pl330->rstc_ocp);
+
+ if (pl330->rstc)
+ reset_control_assert(pl330->rstc);
return 0;
}