linux-kernel - [RFC PATCH 16/25] dmaengine: dw-edma: Expose self-IRQ register offsets

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Message-ID: <20251023071916.901355-17-den@valinux.co.jp>
Date: Thu, 23 Oct 2025 16:19:07 +0900
From: Koichiro Den <den@...inux.co.jp>
To: ntb@...ts.linux.dev,
	linux-pci@...r.kernel.org,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
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Subject: [RFC PATCH 16/25] dmaengine: dw-edma: Expose self-IRQ register offsets

Add helper dw_edma_selfirq_offsets() to query the physical addresses of
status and clear registers for software-triggered IRQs.

Signed-off-by: Koichiro Den <den@...inux.co.jp>
---
 drivers/dma/dw-edma/dw-edma-core.c           | 23 ++++++++++++++++++++
 drivers/pci/controller/dwc/pcie-designware.c |  1 +
 include/linux/dma/edma.h                     | 10 +++++++++
 3 files changed, 34 insertions(+)

diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index 7cf9e5e74a89..28cc319e224d 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -20,6 +20,7 @@
 #include "dw-edma-core.h"
 #include "dw-edma-v0-core.h"
 #include "dw-hdma-v0-core.h"
+#include "dw-edma-v0-regs.h"
 #include "../dmaengine.h"
 #include "../virt-dma.h"
 
@@ -903,6 +904,28 @@ static int dw_edma_irq_request(struct dw_edma *dw,
 	return err;
 }
 
+int dw_edma_selfirq_offsets(struct dw_edma *dw,
+			    resource_size_t *rd_status_off,
+			    resource_size_t *rd_clear_off)
+{
+	struct dw_edma_chip *chip;
+
+	if (!dw)
+		return -ENODEV;
+
+	chip = dw->chip;
+	if (dw->chip->mf == EDMA_MF_EDMA_LEGACY || dw->chip->mf == EDMA_MF_HDMA_NATIVE)
+		return -EOPNOTSUPP;
+	if (rd_status_off)
+		*rd_status_off = (uintptr_t)chip->reg_phys_addr +
+				 offsetof(struct dw_edma_v0_regs, rd_int_status);
+	if (rd_clear_off)
+		*rd_clear_off = (uintptr_t)chip->reg_phys_addr +
+				offsetof(struct dw_edma_v0_regs, rd_int_clear);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dw_edma_selfirq_offsets);
+
 int dw_edma_register_selfirq(struct dw_edma *dw,
 			     dw_edma_selfirq_fn fn, void *data)
 {
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 89aad5a08928..8233cc26249f 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -162,6 +162,7 @@ int dw_pcie_get_resources(struct dw_pcie *pci)
 			pci->edma.reg_base = devm_ioremap_resource(pci->dev, res);
 			if (IS_ERR(pci->edma.reg_base))
 				return PTR_ERR(pci->edma.reg_base);
+			pci->edma.reg_phys_addr = res->start;
 		} else if (pci->atu_size >= 2 * DEFAULT_DBI_DMA_OFFSET) {
 			pci->edma.reg_base = pci->atu_base + DEFAULT_DBI_DMA_OFFSET;
 		}
diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h
index 42daf9a76b56..1f11b70e1b1a 100644
--- a/include/linux/dma/edma.h
+++ b/include/linux/dma/edma.h
@@ -85,6 +85,7 @@ struct dw_edma_chip {
 	u32			flags;
 
 	void __iomem		*reg_base;
+	resource_size_t		reg_phys_addr;
 
 	u16			ll_wr_cnt;
 	u16			ll_rd_cnt;
@@ -107,6 +108,9 @@ typedef void (*dw_edma_selfirq_fn)(struct dw_edma *dw, void *data);
 #if IS_REACHABLE(CONFIG_DW_EDMA)
 int dw_edma_probe(struct dw_edma_chip *chip);
 int dw_edma_remove(struct dw_edma_chip *chip);
+int dw_edma_selfirq_offsets(struct dw_edma *dw,
+			    resource_size_t *rd_status_off,
+			    resource_size_t *rd_clear_off);
 int dw_edma_register_selfirq(struct dw_edma *dw,
 			     dw_edma_selfirq_fn fn, void *data);
 void dw_edma_unregister_selfirq(struct dw_edma *dw,
@@ -121,6 +125,12 @@ static inline int dw_edma_remove(struct dw_edma_chip *chip)
 {
 	return 0;
 }
+static inline int dw_edma_selfirq_offsets(struct dw_edma *dw,
+					  resource_size_t *rd_status_off,
+					  resource_size_t *rd_clear_off)
+{
+	return -EOPNOTSUPP;
+}
 static inline int dw_edma_register_selfirq(struct dw_edma *dw,
 					   dw_edma_selfirq_fn fn, void *data)
 {
-- 
2.48.1