[PATCH 09/10] dmaengine: qcom_hidma: add a common API to setup the interrupt
From: Sinan Kaya <hidden>
Date: 2016-07-18 18:41:11
Also in:
linux-arm-kernel, linux-arm-msm, lkml
Subsystem:
arm/qualcomm mailing list, dma generic offload engine subsystem, qualcomm hidma driver, the rest · Maintainers:
Vinod Koul, Sinan Kaya, Linus Torvalds
Introducing the hidma_ll_setup_irq function to set up the interrupt type externally from the OS interface. Signed-off-by: Sinan Kaya <redacted> --- drivers/dma/qcom/hidma.h | 2 ++ drivers/dma/qcom/hidma_ll.c | 27 +++++++++++++++++++++++---- 2 files changed, 25 insertions(+), 4 deletions(-)
diff --git a/drivers/dma/qcom/hidma.h b/drivers/dma/qcom/hidma.h
index 03c20f6..3f28f39 100644
--- a/drivers/dma/qcom/hidma.h
+++ b/drivers/dma/qcom/hidma.h@@ -49,6 +49,7 @@ struct hidma_tre { }; struct hidma_lldev { + bool msi_support; /* flag indicating MSI support */ bool initialized; /* initialized flag */ u8 trch_state; /* trch_state of the device */ u8 evch_state; /* evch_state of the device */
@@ -146,6 +147,7 @@ int hidma_ll_disable(struct hidma_lldev *lldev); int hidma_ll_enable(struct hidma_lldev *llhndl); void hidma_ll_set_transfer_params(struct hidma_lldev *llhndl, u32 tre_ch, dma_addr_t src, dma_addr_t dest, u32 len, u32 flags); +void hidma_ll_setup_irq(struct hidma_lldev *lldev, bool msi); int hidma_ll_setup(struct hidma_lldev *lldev); struct hidma_lldev *hidma_ll_init(struct device *dev, u32 max_channels, void __iomem *trca, void __iomem *evca,
diff --git a/drivers/dma/qcom/hidma_ll.c b/drivers/dma/qcom/hidma_ll.c
index eb78952..c3d3252 100644
--- a/drivers/dma/qcom/hidma_ll.c
+++ b/drivers/dma/qcom/hidma_ll.c@@ -669,17 +669,36 @@ int hidma_ll_setup(struct hidma_lldev *lldev) writel(HIDMA_EVRE_SIZE * nr_tres, lldev->evca + HIDMA_EVCA_RING_LEN_REG); - /* support IRQ only for now */ + /* configure interrupts */ + hidma_ll_setup_irq(lldev, lldev->msi_support); + + rc = hidma_ll_enable(lldev); + if (rc) + return rc; + + return rc; +} + +void hidma_ll_setup_irq(struct hidma_lldev *lldev, bool msi) +{ + u32 val; + + lldev->msi_support = msi; + + /* disable interrupts again after reset */ + writel(0, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG); + writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG); + + /* support IRQ by default */ val = readl(lldev->evca + HIDMA_EVCA_INTCTRL_REG); val &= ~0xF; - val |= 0x1; + if (!lldev->msi_support) + val = val | 0x1; writel(val, lldev->evca + HIDMA_EVCA_INTCTRL_REG); /* clear all pending interrupts and enable them */ writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG); writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_EN_REG); - - return hidma_ll_enable(lldev); } struct hidma_lldev *hidma_ll_init(struct device *dev, u32 nr_tres,
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1.8.2.1