Subject: [PATCH v3 1/5] remoteproc: add common wc-ioremap carveout callbacks

From: Ben Levinsky <[email-masked]>
Date: Thu, 28 May 2026 19:16:33 -0700

Several remoteproc drivers open-code the same ioremap_wc() and
iounmap() callbacks for carveout mappings. Add subsystem-private
helpers in remoteproc_internal.h so those drivers can share the same
implementation.

Keep this change behavior-neutral. The helper now emits a common error
message on ioremap_wc() failure, but leaves mem->is_iomem handling to a
follow-on patch so that the behavioral change can be justified
separately.

Signed-off-by: Ben Levinsky <[email-masked]>
---
 drivers/remoteproc/remoteproc_internal.h | 26 ++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index 0a5e15744b1d..46080c1c030e 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -14,6 +14,7 @@
 
 #include <linux/irqreturn.h>
 #include <linux/firmware.h>
+#include <linux/io.h>
 
 struct rproc;
 
@@ -122,6 +123,31 @@ rproc_find_carveout_by_name(struct rproc *rproc, const char *name, ...);
 void rproc_add_rvdev(struct rproc *rproc, struct rproc_vdev *rvdev);
 void rproc_remove_rvdev(struct rproc_vdev *rvdev);
 
+static inline int rproc_mem_entry_ioremap_wc(struct rproc *rproc,
+					     struct rproc_mem_entry *mem)
+{
+	void __iomem *va;
+
+	va = ioremap_wc(mem->dma, mem->len);
+	if (!va) {
+		dev_err(&rproc->dev, "Unable to map memory region: %pa+%zx\n",
+			&mem->dma, mem->len);
+		return -ENOMEM;
+	}
+
+	mem->va = (__force void *)va;
+
+	return 0;
+}
+
+static inline int rproc_mem_entry_iounmap(struct rproc *rproc,
+					  struct rproc_mem_entry *mem)
+{
+	iounmap((__force __iomem void *)mem->va);
+
+	return 0;
+}
+
 static inline int rproc_prepare_device(struct rproc *rproc)
 {
 	if (rproc->ops->prepare)
-- 
2.34.1