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        Prabhakar <prabhakar.csengg@gmail.com>,
        Biju Das <biju.das.jz@bp.renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Subject: [PATCH v5 4/6] riscv: mm: dma-noncoherent: Pass direction and operation to ALT_CMO_OP()
Date:   Mon, 12 Dec 2022 11:55:03 +0000
Message-Id: <20221212115505.36770-5-prabhakar.mahadev-lad.rj@bp.renesas.com>
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From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Pass direction and operation to ALT_CMO_OP() macro.

Vendors might want to perform different operations based on the direction
and callbacks (arch_sync_dma_for_device/arch_sync_dma_for_cpu/
arch_dma_prep_coherent) so to handle such cases pass the direction and
operation to ALT_CMO_OP() macro. This is in preparation for adding errata
for the Andes CPU core.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v4 -> v5
* Updated commit message.

RFC v3 -> v4
* New patch
---
 arch/riscv/include/asm/cacheflush.h  |  4 ++++
 arch/riscv/include/asm/errata_list.h |  8 ++++++--
 arch/riscv/mm/dma-noncoherent.c      | 15 ++++++++++-----
 3 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h
index 03e3b95ae6da..e22019668b9e 100644
--- a/arch/riscv/include/asm/cacheflush.h
+++ b/arch/riscv/include/asm/cacheflush.h
@@ -8,6 +8,10 @@
 
 #include <linux/mm.h>
 
+#define NON_COHERENT_SYNC_DMA_FOR_DEVICE	0
+#define NON_COHERENT_SYNC_DMA_FOR_CPU		1
+#define NON_COHERENT_DMA_PREP			2
+
 static inline void local_flush_icache_all(void)
 {
 	asm volatile ("fence.i" ::: "memory");
diff --git a/arch/riscv/include/asm/errata_list.h b/arch/riscv/include/asm/errata_list.h
index 2ba7e6e74540..48e899a8e7a9 100644
--- a/arch/riscv/include/asm/errata_list.h
+++ b/arch/riscv/include/asm/errata_list.h
@@ -124,7 +124,7 @@ asm volatile(ALTERNATIVE(						\
 #define THEAD_flush_A0	".long 0x0275000b"
 #define THEAD_SYNC_S	".long 0x0190000b"
 
-#define ALT_CMO_OP(_op, _start, _size, _cachesize)			\
+#define ALT_CMO_OP(_op, _start, _size, _cachesize, _dir, _ops)		\
 asm volatile(ALTERNATIVE_2(						\
 	__nops(6),							\
 	"mv a0, %1\n\t"							\
@@ -146,7 +146,11 @@ asm volatile(ALTERNATIVE_2(						\
 			ERRATA_THEAD_CMO, CONFIG_ERRATA_THEAD_CMO)	\
 	: : "r"(_cachesize),						\
 	    "r"((unsigned long)(_start) & ~((_cachesize) - 1UL)),	\
-	    "r"((unsigned long)(_start) + (_size))			\
+	    "r"((unsigned long)(_start) + (_size)),			\
+	    "r"((unsigned long)(_start)),				\
+	    "r"((unsigned long)(_size)),				\
+	    "r"((unsigned long)(_dir)),					\
+	    "r"((unsigned long)(_ops))					\
 	: "a0")
 
 #define THEAD_C9XX_RV_IRQ_PMU			17
diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c
index d919efab6eba..e2b82034f504 100644
--- a/arch/riscv/mm/dma-noncoherent.c
+++ b/arch/riscv/mm/dma-noncoherent.c
@@ -19,13 +19,16 @@ void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
 
 	switch (dir) {
 	case DMA_TO_DEVICE:
-		ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size);
+		ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size,
+			   dir, NON_COHERENT_SYNC_DMA_FOR_DEVICE);
 		break;
 	case DMA_FROM_DEVICE:
-		ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size);
+		ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size,
+			   dir, NON_COHERENT_SYNC_DMA_FOR_DEVICE);
 		break;
 	case DMA_BIDIRECTIONAL:
-		ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size);
+		ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size,
+			   dir, NON_COHERENT_SYNC_DMA_FOR_DEVICE);
 		break;
 	default:
 		break;
@@ -42,7 +45,8 @@ void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
 		break;
 	case DMA_FROM_DEVICE:
 	case DMA_BIDIRECTIONAL:
-		ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size);
+		ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size,
+			   dir, NON_COHERENT_SYNC_DMA_FOR_CPU);
 		break;
 	default:
 		break;
@@ -53,7 +57,8 @@ void arch_dma_prep_coherent(struct page *page, size_t size)
 {
 	void *flush_addr = page_address(page);
 
-	ALT_CMO_OP(flush, flush_addr, size, riscv_cbom_block_size);
+	ALT_CMO_OP(flush, flush_addr, size, riscv_cbom_block_size,
+		   0, NON_COHERENT_DMA_PREP);
 }
 
 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
-- 
2.25.1