MIPS: loongson64: use generic dma noncoherent ops

Provide phys_to_dma/dma_to_phys helpers, everything else is generic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19545/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 47592cc..aa438f0 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1828,6 +1828,7 @@ config CPU_LOONGSON2
        select CPU_SUPPORTS_64BIT_KERNEL
        select CPU_SUPPORTS_HIGHMEM
        select CPU_SUPPORTS_HUGEPAGES
+       select ARCH_HAS_PHYS_TO_DMA
 
 config CPU_LOONGSON1
        bool

diff --git a/arch/mips/include/asm/mach-loongson64/dma-coherence.h b/arch/mips/include/asm/mach-loongson64/dma-coherence.h
deleted file mode 100644 (file)
index 651dd2e..0000000
--- a/arch/mips/include/asm/mach-loongson64/dma-coherence.h
+++ /dev/null
@@ -1,69 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2006, 07  Ralf Baechle <ralf@linux-mips.org>
- * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
- * Author: Fuxin Zhang, zhangfx@lemote.com
- *
- */
-#ifndef __ASM_MACH_LOONGSON64_DMA_COHERENCE_H
-#define __ASM_MACH_LOONGSON64_DMA_COHERENCE_H
-
-#ifdef CONFIG_SWIOTLB
-#include <linux/swiotlb.h>
-#endif
-
-struct device;
-
-static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
-                                         size_t size)
-{
-       return virt_to_phys(addr) | 0x80000000;
-}
-
-static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
-                                              struct page *page)
-{
-       return page_to_phys(page) | 0x80000000;
-}
-
-static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
-       dma_addr_t dma_addr)
-{
-#if defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
-       return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff);
-#else
-       return dma_addr & 0x7fffffff;
-#endif
-}
-
-static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
-       size_t size, enum dma_data_direction direction)
-{
-}
-
-static inline int plat_dma_supported(struct device *dev, u64 mask)
-{
-       /*
-        * we fall back to GFP_DMA when the mask isn't all 1s,
-        * so we can't guarantee allocations that must be
-        * within a tighter range than GFP_DMA..
-        */
-       if (mask < DMA_BIT_MASK(24))
-               return 0;
-
-       return 1;
-}
-
-static inline int plat_device_is_coherent(struct device *dev)
-{
-       return 0;
-}
-
-static inline void plat_post_dma_flush(struct device *dev)
-{
-}
-
-#endif /* __ASM_MACH_LOONGSON64_DMA_COHERENCE_H */

diff --git a/arch/mips/loongson64/Kconfig b/arch/mips/loongson64/Kconfig
index a785bf8..c865b4b 100644 (file)
--- a/arch/mips/loongson64/Kconfig
+++ b/arch/mips/loongson64/Kconfig
@@ -13,7 +13,6 @@ config LEMOTE_FULOONG2E
        select CSRC_R4K
        select SYS_HAS_CPU_LOONGSON2E
        select DMA_NONCOHERENT
-       select MIPS_DMA_DEFAULT
        select BOOT_ELF32
        select BOARD_SCACHE
        select HW_HAS_PCI
@@ -45,7 +44,6 @@ config LEMOTE_MACH2F
        select CS5536
        select CSRC_R4K if ! MIPS_EXTERNAL_TIMER
        select DMA_NONCOHERENT
-       select MIPS_DMA_DEFAULT
        select GENERIC_ISA_DMA_SUPPORT_BROKEN
        select HAVE_CLK
        select HW_HAS_PCI

diff --git a/arch/mips/loongson64/common/Makefile b/arch/mips/loongson64/common/Makefile
index 684624f..57ee030 100644 (file)
--- a/arch/mips/loongson64/common/Makefile
+++ b/arch/mips/loongson64/common/Makefile
@@ -6,6 +6,7 @@
 obj-y += setup.o init.o cmdline.o env.o time.o reset.o irq.o \
     bonito-irq.o mem.o machtype.o platform.o serial.o
 obj-$(CONFIG_PCI) += pci.o
+obj-$(CONFIG_CPU_LOONGSON2) += dma.o
 
 #
 # Serial port support

diff --git a/arch/mips/loongson64/common/dma.c b/arch/mips/loongson64/common/dma.c
new file mode 100644 (file)
index 0000000..48f0412
--- /dev/null
+++ b/arch/mips/loongson64/common/dma.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/dma-direct.h>
+
+dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+       return paddr | 0x80000000;
+}
+
+phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dma_addr)
+{
+#if defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
+       if (dma_addr > 0x8fffffff)
+               return dma_addr;
+       return dma_addr & 0x0fffffff;
+#else
+       return dma_addr & 0x7fffffff;
+#endif
+}