Loongson-3 is a multi-core MIPS family CPU, it support MIPS64R2 fully.
Loongson-3 has the same IMP field (0x6300) as Loongson-2.

Loongson-3 has a hardware-maintained cache, system software doesn't
need to maintain coherency.

Loongson-3A is the first revision of Loongson-3, and it is the quad-
core version of Loongson-2G. Loongson-3A has a simplified version named
Loongson-2Gq, the main difference between Loongson-3A/2Gq is 3A has two
HyperTransport controller but 2Gq has only one. HT0 is used for cross-
chip interconnection and HT1 is used to link PCI bus. Therefore, 2Gq
cannot support NUMA but 3A can. For software, Loongson-2Gq is simply
identified as Loongson-3A.

Exsisting Loongson family CPUs:
Loongson-1: Loongson-1A, Loongson-1B, they are 32-bit MIPS CPUs.
Loongson-2: Loongson-2E, Loongson-2F, Loongson-2G, they are 64-bit
            single-core MIPS CPUs.
Loongson-3: Loongson-3A(including so-called Loongson-2Gq), they are
            64-bit multi-core MIPS CPUs.

Signed-off-by: Huacai Chen <redacted>
Signed-off-by: Hongliang Tao <redacted>
Signed-off-by: Hua Yan <redacted>
Tested-by: Alex Smith <redacted>
Reviewed-by: Alex Smith <redacted>
---
 arch/mips/include/asm/addrspace.h            |    2 ++
 arch/mips/include/asm/cpu.h                  |    5 +++--
 arch/mips/include/asm/mach-loongson/spaces.h |   13 +++++++++++++
 arch/mips/include/asm/module.h               |    2 ++
 arch/mips/include/asm/pgtable-bits.h         |    9 +++++++++
 5 files changed, 29 insertions(+), 2 deletions(-)
 create mode 100644 arch/mips/include/asm/mach-loongson/spaces.h

diff --git a/arch/mips/include/asm/addrspace.h b/arch/mips/include/asm/addrspace.h
index 3f74545..41c030e 100644
--- a/arch/mips/include/asm/addrspace.h
+++ b/arch/mips/include/asm/addrspace.h

@@ -116,7 +116,9 @@
 #define K_CALG_UNCACHED                2
 #define K_CALG_NONCOHERENT     3
 #define K_CALG_COH_EXCL                4
+#ifndef K_CALG_COH_SHAREABLE
 #define K_CALG_COH_SHAREABLE   5
+#endif
 #define K_CALG_NOTUSED         6
 #define K_CALG_UNCACHED_ACCEL  7

diff --git a/arch/mips/include/asm/cpu.h b/arch/mips/include/asm/cpu.h
index 01d757c..530eb8b 100644
--- a/arch/mips/include/asm/cpu.h
+++ b/arch/mips/include/asm/cpu.h

@@ -231,6 +231,7 @@
 #define PRID_REV_LOONGSON1B    0x0020
 #define PRID_REV_LOONGSON2E    0x0002
 #define PRID_REV_LOONGSON2F    0x0003
+#define PRID_REV_LOONGSON3A    0x0005

 /*
  * Older processors used to encode processor version and revision in two

@@ -304,8 +305,8 @@ enum cpu_type_enum {
         * MIPS64 class processors
         */
        CPU_5KC, CPU_5KE, CPU_20KC, CPU_25KF, CPU_SB1, CPU_SB1A, CPU_LOONGSON2,
-       CPU_CAVIUM_OCTEON, CPU_CAVIUM_OCTEON_PLUS, CPU_CAVIUM_OCTEON2,
-       CPU_CAVIUM_OCTEON3, CPU_XLR, CPU_XLP,
+       CPU_LOONGSON3, CPU_CAVIUM_OCTEON, CPU_CAVIUM_OCTEON_PLUS,
+       CPU_CAVIUM_OCTEON2, CPU_CAVIUM_OCTEON3, CPU_XLR, CPU_XLP,

        CPU_LAST
 };

diff --git a/arch/mips/include/asm/mach-loongson/spaces.h b/arch/mips/include/asm/mach-loongson/spaces.h
new file mode 100644
index 0000000..883868b
--- /dev/null
+++ b/arch/mips/include/asm/mach-loongson/spaces.h

@@ -0,0 +1,13 @@
+#ifndef __ASM_MACH_LOONGSON_SPACES_H_
+#define __ASM_MACH_LOONGSON_SPACES_H_
+
+#ifndef CAC_BASE
+#if defined(CONFIG_64BIT)
+#define CAC_BASE        _AC(0x9800000000000000, UL)
+#endif /* CONFIG_64BIT */
+#endif /* CAC_BASE */
+
+#define K_CALG_COH_SHAREABLE   3
+
+#include <asm/mach-generic/spaces.h>
+#endif

diff --git a/arch/mips/include/asm/module.h b/arch/mips/include/asm/module.h
index 44b705d..c2edae3 100644
--- a/arch/mips/include/asm/module.h
+++ b/arch/mips/include/asm/module.h

@@ -126,6 +126,8 @@ search_module_dbetables(unsigned long addr)
 #define MODULE_PROC_FAMILY "LOONGSON1 "
 #elif defined CONFIG_CPU_LOONGSON2
 #define MODULE_PROC_FAMILY "LOONGSON2 "
+#elif defined CONFIG_CPU_LOONGSON3
+#define MODULE_PROC_FAMILY "LOONGSON3 "
 #elif defined CONFIG_CPU_CAVIUM_OCTEON
 #define MODULE_PROC_FAMILY "OCTEON "
 #elif defined CONFIG_CPU_XLR

diff --git a/arch/mips/include/asm/pgtable-bits.h b/arch/mips/include/asm/pgtable-bits.h
index 32aea48..e592f36 100644
--- a/arch/mips/include/asm/pgtable-bits.h
+++ b/arch/mips/include/asm/pgtable-bits.h

@@ -235,6 +235,15 @@ static inline uint64_t pte_to_entrylo(unsigned long pte_val)
 #define _CACHE_CACHABLE_NONCOHERENT (5<<_CACHE_SHIFT)
 #define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT)

+#elif defined(CONFIG_CPU_LOONGSON3)
+
+/* Using COHERENT flag for NONCOHERENT doesn't hurt. */
+
+#define _CACHE_UNCACHED             (2<<_CACHE_SHIFT)  /* LOONGSON       */
+#define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT)  /* LOONGSON       */
+#define _CACHE_CACHABLE_COHERENT    (3<<_CACHE_SHIFT)  /* LOONGSON-3     */
+#define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT)  /* LOONGSON       */
+
 #else

 #define _CACHE_CACHABLE_NO_WA      (0<<_CACHE_SHIFT)  /* R4600 only      */
--

1.7.7.3