linux-kernel - [PATCH v8 6/7] riscv: errata: Hookup the Andes AX45MP non-coherent handling

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Date:   Wed, 12 Apr 2023 12:08:59 +0100
From:   Prabhakar <prabhakar.csengg@...il.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Heiko Stuebner <heiko@...ech.de>, Guo Ren <guoren@...nel.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Samuel Holland <samuel@...lland.org>,
        linux-riscv@...ts.infradead.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v8 6/7] riscv: errata: Hookup the Andes AX45MP non-coherent handling

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Hookup the Andes AX45MP non-coherent handling by updating the
ALT_CMO_OP() macro which will be used by dma-noncoherent.c for
non-coherent platforms.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
v7->v8
* New patch
---
 arch/riscv/include/asm/cacheflush.h  |  9 ++++++++
 arch/riscv/include/asm/errata_list.h | 33 ++++++++++++++++++++++------
 2 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h
index 8091b8bf4883..a8503cc04fdb 100644
--- a/arch/riscv/include/asm/cacheflush.h
+++ b/arch/riscv/include/asm/cacheflush.h
@@ -59,6 +59,15 @@ void riscv_noncoherent_supported(void);
 static inline void riscv_noncoherent_supported(void) {}
 #endif
 
+#ifdef CONFIG_AX45MP_L2_CACHE
+extern asmlinkage void ax45mp_dma_cache_wback_inv(void *vaddr, unsigned long size);
+extern asmlinkage void ax45mp_dma_cache_wback(void *vaddr, unsigned long size);
+extern asmlinkage void ax45mp_dma_cache_inv(void *vaddr, unsigned long size);
+#else
+static inline void ax45mp_dma_cache_wback_inv(void *vaddr, unsigned long size) {}
+static inline void ax45mp_dma_cache_wback(void *vaddr, unsigned long size) {}
+static inline void ax45mp_dma_cache_inv(void *vaddr, unsigned long size) {}
+#endif
 /*
  * Bits in sys_riscv_flush_icache()'s flags argument.
  */
diff --git a/arch/riscv/include/asm/errata_list.h b/arch/riscv/include/asm/errata_list.h
index e2ecd01bfac7..8e9811c14ba3 100644
--- a/arch/riscv/include/asm/errata_list.h
+++ b/arch/riscv/include/asm/errata_list.h
@@ -122,9 +122,13 @@ asm volatile(ALTERNATIVE(						\
 #define THEAD_flush_A0	".long 0x0275000b"
 #define THEAD_SYNC_S	".long 0x0190000b"
 
+#define ANDESTECH_AX45MP_clean	"call ax45mp_dma_cache_wback"
+#define ANDESTECH_AX45MP_inval	"call ax45mp_dma_cache_inv"
+#define ANDESTECH_AX45MP_flush	"call ax45mp_dma_cache_wback_inv"
+
 #define ALT_CMO_OP(_op, _start, _size, _cachesize)			\
-asm volatile(ALTERNATIVE_2(						\
-	__nops(6),							\
+asm volatile(ALTERNATIVE_3(						\
+	__nops(11),							\
 	"mv a0, %1\n\t"							\
 	"j 2f\n\t"							\
 	"3:\n\t"							\
@@ -132,7 +136,7 @@ asm volatile(ALTERNATIVE_2(						\
 	"add a0, a0, %0\n\t"						\
 	"2:\n\t"							\
 	"bltu a0, %2, 3b\n\t"						\
-	"nop", 0, RISCV_ISA_EXT_ZICBOM, CONFIG_RISCV_ISA_ZICBOM,	\
+	__nops(6), 0, RISCV_ISA_EXT_ZICBOM, CONFIG_RISCV_ISA_ZICBOM,	\
 	"mv a0, %1\n\t"							\
 	"j 2f\n\t"							\
 	"3:\n\t"							\
@@ -140,12 +144,27 @@ asm volatile(ALTERNATIVE_2(						\
 	"add a0, a0, %0\n\t"						\
 	"2:\n\t"							\
 	"bltu a0, %2, 3b\n\t"						\
-	THEAD_SYNC_S, THEAD_VENDOR_ID,					\
-			ERRATA_THEAD_CMO, CONFIG_ERRATA_THEAD_CMO)	\
+	THEAD_SYNC_S "\n\t"						\
+	__nops(5), THEAD_VENDOR_ID,					\
+			ERRATA_THEAD_CMO, CONFIG_ERRATA_THEAD_CMO,	\
+	"addi sp,sp,-16\n\t"						\
+	"sd s0,0(sp)\n\t"						\
+	"sd ra,8(sp)\n\t"						\
+	"addi s0,sp,16\n\t"						\
+	"mv a1,%4\n\t"							\
+	"mv a0,%3\n\t"							\
+	ANDESTECH_AX45MP_##_op "\n\t"					\
+	"ld ra,8(sp)\n\t"						\
+	"ld s0,0(sp)\n\t"						\
+	"addi sp,sp,16\n\t",						\
+	ANDESTECH_VENDOR_ID, ERRATA_ANDESTECH_NO_IOCP,			\
+		CONFIG_ERRATA_ANDES)					\
 	: : "r"(_cachesize),						\
 	    "r"((unsigned long)(_start) & ~((_cachesize) - 1UL)),	\
-	    "r"((unsigned long)(_start) + (_size))			\
-	: "a0")
+	    "r"((unsigned long)(_start) + (_size)),			\
+	    "r"((void *)(_start)),					\
+	    "r"((unsigned long)(_size))					\
+	: "a0", "a1")
 
 #define THEAD_C9XX_RV_IRQ_PMU			17
 #define THEAD_C9XX_CSR_SCOUNTEROF		0x5c5
-- 
2.25.1