From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 sound/core/memory.c | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 sound/core/memory.c

(limited to 'sound/core/memory.c')

diff --git a/sound/core/memory.c b/sound/core/memory.c
new file mode 100644
index 0000000000..2d2d0094c8
--- /dev/null
+++ b/sound/core/memory.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ * 
+ *  Misc memory accessors
+ */
+
+#include <linux/export.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+
+/**
+ * copy_to_user_fromio - copy data from mmio-space to user-space
+ * @dst: the destination pointer on user-space
+ * @src: the source pointer on mmio
+ * @count: the data size to copy in bytes
+ *
+ * Copies the data from mmio-space to user-space.
+ *
+ * Return: Zero if successful, or non-zero on failure.
+ */
+int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
+{
+	struct iov_iter iter;
+
+	if (import_ubuf(ITER_DEST, dst, count, &iter))
+		return -EFAULT;
+	return copy_to_iter_fromio(&iter, (const void __iomem *)src, count);
+}
+EXPORT_SYMBOL(copy_to_user_fromio);
+
+/**
+ * copy_to_iter_fromio - copy data from mmio-space to iov_iter
+ * @dst: the destination iov_iter
+ * @src: the source pointer on mmio
+ * @count: the data size to copy in bytes
+ *
+ * Copies the data from mmio-space to iov_iter.
+ *
+ * Return: Zero if successful, or non-zero on failure.
+ */
+int copy_to_iter_fromio(struct iov_iter *dst, const void __iomem *src,
+			size_t count)
+{
+#if defined(__i386__) || defined(CONFIG_SPARC32)
+	return copy_to_iter((const void __force *)src, count, dst) == count ? 0 : -EFAULT;
+#else
+	char buf[256];
+	while (count) {
+		size_t c = count;
+		if (c > sizeof(buf))
+			c = sizeof(buf);
+		memcpy_fromio(buf, (void __iomem *)src, c);
+		if (copy_to_iter(buf, c, dst) != c)
+			return -EFAULT;
+		count -= c;
+		src += c;
+	}
+	return 0;
+#endif
+}
+EXPORT_SYMBOL(copy_to_iter_fromio);
+
+/**
+ * copy_from_user_toio - copy data from user-space to mmio-space
+ * @dst: the destination pointer on mmio-space
+ * @src: the source pointer on user-space
+ * @count: the data size to copy in bytes
+ *
+ * Copies the data from user-space to mmio-space.
+ *
+ * Return: Zero if successful, or non-zero on failure.
+ */
+int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
+{
+	struct iov_iter iter;
+
+	if (import_ubuf(ITER_SOURCE, (void __user *)src, count, &iter))
+		return -EFAULT;
+	return copy_from_iter_toio((void __iomem *)dst, &iter, count);
+}
+EXPORT_SYMBOL(copy_from_user_toio);
+
+/**
+ * copy_from_iter_toio - copy data from iov_iter to mmio-space
+ * @dst: the destination pointer on mmio-space
+ * @src: the source iov_iter
+ * @count: the data size to copy in bytes
+ *
+ * Copies the data from iov_iter to mmio-space.
+ *
+ * Return: Zero if successful, or non-zero on failure.
+ */
+int copy_from_iter_toio(void __iomem *dst, struct iov_iter *src, size_t count)
+{
+#if defined(__i386__) || defined(CONFIG_SPARC32)
+	return copy_from_iter((void __force *)dst, count, src) == count ? 0 : -EFAULT;
+#else
+	char buf[256];
+	while (count) {
+		size_t c = count;
+		if (c > sizeof(buf))
+			c = sizeof(buf);
+		if (copy_from_iter(buf, c, src) != c)
+			return -EFAULT;
+		memcpy_toio(dst, buf, c);
+		count -= c;
+		dst += c;
+	}
+	return 0;
+#endif
+}
+EXPORT_SYMBOL(copy_from_iter_toio);
-- 
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