MIPS: loongson: untangle dma implementations

Only loongson-3 is DMA coherent and uses swiotlb.  So move the dma
address translations stubs directly to the loongson-3 code, and remove
a few Kconfig indirections.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19539/
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 7c539a3..6248bef 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -454,7 +454,6 @@ config MACH_LOONGSON32
 
 config MACH_LOONGSON64
        bool "Loongson-2/3 family of machines"
-       select ARCH_HAS_PHYS_TO_DMA
        select SYS_SUPPORTS_ZBOOT
        help
          This enables the support of Loongson-2/3 family of machines.
@@ -1389,6 +1388,7 @@ choice
 config CPU_LOONGSON3
        bool "Loongson 3 CPU"
        depends on SYS_HAS_CPU_LOONGSON3
+       select ARCH_HAS_PHYS_TO_DMA
        select CPU_SUPPORTS_64BIT_KERNEL
        select CPU_SUPPORTS_HIGHMEM
        select CPU_SUPPORTS_HUGEPAGES

diff --git a/arch/mips/loongson64/Kconfig b/arch/mips/loongson64/Kconfig
index dbd2a9f..a785bf8 100644 (file)
--- a/arch/mips/loongson64/Kconfig
+++ b/arch/mips/loongson64/Kconfig
@@ -93,7 +93,6 @@ config LOONGSON_MACH3X
        select LOONGSON_MC146818
        select ZONE_DMA32
        select LEFI_FIRMWARE_INTERFACE
-       select PHYS48_TO_HT40
        help
                Generic Loongson 3 family machines utilize the 3A/3B revision
                of Loongson processor and RS780/SBX00 chipset.
@@ -132,10 +131,6 @@ config LOONGSON_UART_BASE
        default y
        depends on EARLY_PRINTK || SERIAL_8250
 
-config PHYS48_TO_HT40
-       bool
-       default y if CPU_LOONGSON3
-
 config LOONGSON_MC146818
        bool
        default n

diff --git a/arch/mips/loongson64/common/Makefile b/arch/mips/loongson64/common/Makefile
index 8235ac7..684624f 100644 (file)
--- a/arch/mips/loongson64/common/Makefile
+++ b/arch/mips/loongson64/common/Makefile
@@ -25,8 +25,3 @@ obj-$(CONFIG_CS5536) += cs5536/
 #
 
 obj-$(CONFIG_SUSPEND) += pm.o
-
-#
-# Big Memory (SWIOTLB) Support
-#
-obj-$(CONFIG_SWIOTLB) += dma-swiotlb.o

diff --git a/arch/mips/loongson64/loongson-3/Makefile b/arch/mips/loongson64/loongson-3/Makefile
index 44bc148..b5a0c2f 100644 (file)
--- a/arch/mips/loongson64/loongson-3/Makefile
+++ b/arch/mips/loongson64/loongson-3/Makefile
@@ -1,7 +1,7 @@
 #
 # Makefile for Loongson-3 family machines
 #
-obj-y                  += irq.o cop2-ex.o platform.o acpi_init.o
+obj-y                  += irq.o cop2-ex.o platform.o acpi_init.o dma.o
 
 obj-$(CONFIG_SMP)      += smp.o
 

diff --git a/arch/mips/loongson64/common/dma-swiotlb.c b/arch/mips/loongson64/loongson-3/dma.c
similarity index 68%
rename from arch/mips/loongson64/common/dma-swiotlb.c
rename to arch/mips/loongson64/loongson-3/dma.c
index a4f554b..5e86635 100644 (file)
--- a/arch/mips/loongson64/common/dma-swiotlb.c
+++ b/arch/mips/loongson64/loongson-3/dma.c
@@ -5,26 +5,18 @@
 
 dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
-       long nid;
-#ifdef CONFIG_PHYS48_TO_HT40
        /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
         * Loongson-3's 48bit address space and embed it into 40bit */
-       nid = (paddr >> 44) & 0x3;
-       paddr = ((nid << 44) ^ paddr) | (nid << 37);
-#endif
-       return paddr;
+       long nid = (paddr >> 44) & 0x3;
+       return ((nid << 44) ^ paddr) | (nid << 37);
 }
 
 phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
 {
-       long nid;
-#ifdef CONFIG_PHYS48_TO_HT40
        /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
         * Loongson-3's 48bit address space and embed it into 40bit */
-       nid = (daddr >> 37) & 0x3;
-       daddr = ((nid << 37) ^ daddr) | (nid << 44);
-#endif
-       return daddr;
+       long nid = (daddr >> 37) & 0x3;
+       return ((nid << 37) ^ daddr) | (nid << 44);
 }
 
 void __init plat_swiotlb_setup(void)