arm: asm/cache.c: Introduce arm_reserve_mmu

[oweals/u-boot.git] / arch / arm / include / asm / cache.h

diff --git a/arch/arm/include/asm/cache.h b/arch/arm/include/asm/cache.h
index 16e65c36a9a5dacefadd4281b30a8a4d4bc77c41..c20e05ec7fdb0652a0459f389c95972ea6a0c1da 100644 (file)
--- a/arch/arm/include/asm/cache.h
+++ b/arch/arm/include/asm/cache.h
@@ -1,9 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright 2009
  * Marvell Semiconductor <www.marvell.com>
  * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
- *
- * SPDX-License-Identifier:    GPL-2.0+
  */
 
 #ifndef _ASM_CACHE_H
@@ -16,7 +15,7 @@
 /*
  * Invalidate L2 Cache using co-proc instruction
  */
-#ifdef CONFIG_SYS_THUMB_BUILD
+#if CONFIG_IS_ENABLED(SYS_THUMB_BUILD)
 void invalidate_l2_cache(void);
 #else
 static inline void invalidate_l2_cache(void)
@@ -43,14 +42,22 @@ void dram_bank_mmu_setup(int bank);
 #endif
 
 /*
- * The current upper bound for ARM L1 data cache line sizes is 64 bytes.  We
- * use that value for aligning DMA buffers unless the board config has specified
- * an alternate cache line size.
+ * The value of the largest data cache relevant to DMA operations shall be set
+ * for us in CONFIG_SYS_CACHELINE_SIZE.  In some cases this may be a larger
+ * value than found in the L1 cache but this is OK to use in terms of
+ * alignment.
  */
-#ifdef CONFIG_SYS_CACHELINE_SIZE
 #define ARCH_DMA_MINALIGN      CONFIG_SYS_CACHELINE_SIZE
-#else
-#define ARCH_DMA_MINALIGN      64
-#endif
+
+/*
+ * arm_reserve_mmu() - Reserve memory for MMU TLB table
+ *
+ * Default implementation for reserving memory for MMU TLB table. It is used
+ * during generic board init sequence in common/board_f.c. Weakly defined, so
+ * that machines can override it if needed.
+ *
+ * Return: 0 if OK
+ */
+int arm_reserve_mmu(void);
 
 #endif /* _ASM_CACHE_H */