[PATCH V2 3/3] dmaengine: qcom_hidma: add identity register support

Sinan Kaya
2017-11-08T16:30:08Z

The location for destination event channel register has been relocated from
offset 0x28 to 0x40. Update the code accordingly.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
---
drivers/dma/qcom/hidma.c | 33 ++++++++++++++++++++++++++++++++-
1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c
index 4ef7d6f..e8b7be0 100644
--- a/drivers/dma/qcom/hidma.c
+++ b/drivers/dma/qcom/hidma.c
@@ -126,6 +126,18 @@ struct hidma_cap {
}
};

+static struct hidma_cap hidma_identity_cap = {
+ .of = {
+ {.compatible = "qcom,hidma-1.2",},
+ {},
+ },
+
+ .acpi = {
+ {"QCOM8063"},
+ {},
+ }
+};
+
/* process completed descriptors */
static void hidma_process_completed(struct hidma_chan *mchan)
{
@@ -772,6 +784,22 @@ static bool hidma_msi_capable(struct device *dev)
return ret;
}

+static bool hidma_identity_capable(struct device *dev)
+{
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+ int ret;
+
+ if (!adev || acpi_disabled)
+ ret = of_match_device(hidma_identity_cap.of, dev) != NULL;
+ else {
+#ifdef CONFIG_ACPI
+ ret = acpi_match_device(hidma_identity_cap.acpi, dev) != NULL;
+#endif
+ }
+
+ return ret;
+}
+
static int hidma_probe(struct platform_device *pdev)
{
struct hidma_dev *dmadev;
@@ -863,7 +891,10 @@ static int hidma_probe(struct platform_device *pdev)
if (!dmadev->nr_descriptors)
dmadev->nr_descriptors = HIDMA_NR_DEFAULT_DESC;

- dmadev->chidx = readl(dmadev->dev_trca + 0x28);
+ if (hidma_identity_capable(&pdev->dev))
+ dmadev->chidx = readl(dmadev->dev_trca + 0x40);
+ else
+ dmadev->chidx = readl(dmadev->dev_trca + 0x28);

/* Set DMA mask to 64 bits. */
rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
--
1.9.1