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04f6769a4a
Introduce support for U-Boot for Airoha EN7581/AN7583. For EN7581 initial patch are already in U-Boot mainline and doesn't require backport, for AN7583 some patch are still pending but already posted upstream. Also add for now, precompiled binary for ATF BL2 and BL31. Support for ATF is planned and will come later. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
56 lines
2.0 KiB
Diff
56 lines
2.0 KiB
Diff
From 4f1fcf5281ee4e22b1e89a62bd0417878bcbeca5 Mon Sep 17 00:00:00 2001
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From: Christian Marangi <ansuelsmth@gmail.com>
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Date: Tue, 3 Jun 2025 10:41:18 +0200
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Subject: [PATCH 1/2] linux/bitfield.h: import FIELD_PREP_CONST macro from
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Linux Kernel
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Import FIELD_PREP_CONST macro from Linux Kernel to permit usage of
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FIELD_PREP with scenario where a constant value is needed.
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Refer to commit e2192de59e45 ("bitfield: add FIELD_PREP_CONST()") in
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Linux kernel for extensive explaination of why this is useful.
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This is also to better align with the Linux Kernel for easier porting of
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driver.
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Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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---
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include/linux/bitfield.h | 26 ++++++++++++++++++++++++++
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1 file changed, 26 insertions(+)
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--- a/include/linux/bitfield.h
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+++ b/include/linux/bitfield.h
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@@ -90,6 +90,32 @@
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((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask); \
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})
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+#define __BF_CHECK_POW2(n) BUILD_BUG_ON_ZERO(((n) & ((n) - 1)) != 0)
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+
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+/**
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+ * FIELD_PREP_CONST() - prepare a constant bitfield element
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+ * @_mask: shifted mask defining the field's length and position
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+ * @_val: value to put in the field
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+ *
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+ * FIELD_PREP_CONST() masks and shifts up the value. The result should
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+ * be combined with other fields of the bitfield using logical OR.
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+ *
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+ * Unlike FIELD_PREP() this is a constant expression and can therefore
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+ * be used in initializers. Error checking is less comfortable for this
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+ * version, and non-constant masks cannot be used.
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+ */
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+#define FIELD_PREP_CONST(_mask, _val) \
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+ ( \
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+ /* mask must be non-zero */ \
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+ BUILD_BUG_ON_ZERO((_mask) == 0) + \
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+ /* check if value fits */ \
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+ BUILD_BUG_ON_ZERO(~((_mask) >> __bf_shf(_mask)) & (_val)) + \
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+ /* check if mask is contiguous */ \
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+ __BF_CHECK_POW2((_mask) + (1ULL << __bf_shf(_mask))) + \
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+ /* and create the value */ \
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+ (((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask)) \
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+ )
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+
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/**
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* FIELD_GET() - extract a bitfield element
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* @_mask: shifted mask defining the field's length and position
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