Hi Peng.
On 10/14/2025 7:31 AM, Peng Fan wrote:
On Mon, Oct 13, 2025 at 11:41:25PM +0530, Kumar, Udit wrote:
On 10/13/2025 8:19 AM, Peng Fan (OSS) wrote:
From: Peng Fan <[email protected]>
memcpy_{from,to}io and memset_io is needed for i.MX8M to write
TCM area. So import the APIs from Linux Kernel 6.17.
Reviewed-by: Ye Li <[email protected]>
Signed-off-by: Peng Fan <[email protected]>
---
include/asm-generic/io.h | 37 +++++++++++++
lib/Makefile | 1 +
lib/iomem_copy.c | 136
+++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 174 insertions(+)
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index
13d99cfb5973399209c00adee0080ff83414c064..cf981ad3501f935c714b7580536540e7aba249c1
100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -3,6 +3,7 @@
* Generic I/O functions.
*
* Copyright (c) 2016 Imagination Technologies Ltd.
+ * Copyright 2025 NXP
*/
#ifndef __ASM_GENERIC_IO_H__
@@ -453,5 +454,41 @@ static inline void iowrite64_rep(volatile void __iomem
*addr,
#endif
#endif /* CONFIG_64BIT */
+#ifndef memset_io
If you are on arm, then
arch/arm/include/asm/io.h defines these io functions, for ARM64 and non-ARM64
platform,
In your SOC, how this works.
Thanks for pointing this out, I thought these helpers were not defined,
so I import this file from Linux. So on my platform, the arm64 io helpers
are used, the functions in this file are not used because there is
"#ifndef xx".
But anyway, for non-ARM/ARM64 platforms, this file is still useful.
I could drop this if you prefer. Or keep this for other ARCH.
if you are test on other ARCH, please keep otherwise, you can drop this.
Thanks
Peng
+/**
+ * memset_io - Set a range of I/O memory to a constant value
+ * @addr: The beginning of the I/O-memory range to set
+ * @val: The value to set the memory to
+ * @count: The number of bytes to set
+ *
+ * Set a range of I/O memory to a given value.
+ */
+void memset_io(volatile void __iomem *addr, int val, size_t count);
+#endif
+
+#ifndef memcpy_fromio
+/**
[..]
