MIPS: Cavium: Add support for 8k and 32k page sizes.

Beyond the requirements of the architecture standard Cavium also supports
8k and 32k pages.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: David Daney <ddaney@caviumnetworks.com>

6 files changed, 44 insertions, 4 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 998e5db8cc0..023aa2d4650 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1411,13 +1411,12 @@ config PAGE_SIZE_4KB
 
 config PAGE_SIZE_8KB
         bool "8kB"
-        depends on EXPERIMENTAL && CPU_R8000
+        depends on (EXPERIMENTAL && CPU_R8000) || CPU_CAVIUM_OCTEON
         help
           Using 8kB page size will result in higher performance kernel at
           the price of higher memory consumption.  This option is available
-          only on the R8000 processor.  Not that at the time of this writing
-          this option is still high experimental; there are also issues with
-          compatibility of user applications.
+          only on R8000 and cnMIPS processors.  Note that you will need a
+          suitable Linux distribution to support this.
 
 config PAGE_SIZE_16KB
         bool "16kB"
@@ -1428,6 +1427,15 @@ config PAGE_SIZE_16KB
           all non-R3000 family processors.  Note that you will need a suitable
           Linux distribution to support this.
 
+config PAGE_SIZE_32KB
+        bool "32kB"
+        depends on CPU_CAVIUM_OCTEON
+        help
+          Using 32kB page size will result in higher performance kernel at
+          the price of higher memory consumption.  This option is available
+          only on cnMIPS cores.  Note that you will need a suitable Linux
+          distribution to support this.
+
 config PAGE_SIZE_64KB
         bool "64kB"
         depends on EXPERIMENTAL && !CPU_R3000 && !CPU_TX39XX
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index 1f798779378..0ef30c81fea 100644
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -184,12 +184,19 @@
 #else
 
 #define PM_4K           0x00000000
+#define PM_8K           0x00002000
 #define PM_16K          0x00006000
+#define PM_32K          0x0000e000
 #define PM_64K          0x0001e000
+#define PM_128K         0x0003e000
 #define PM_256K         0x0007e000
+#define PM_512K         0x000fe000
 #define PM_1M           0x001fe000
+#define PM_2M           0x003fe000
 #define PM_4M           0x007fe000
+#define PM_8M           0x00ffe000
 #define PM_16M          0x01ffe000
+#define PM_32M          0x03ffe000
 #define PM_64M          0x07ffe000
 #define PM_256M         0x1fffe000
 #define PM_1G           0x7fffe000
@@ -201,8 +208,12 @@
  */
 #ifdef CONFIG_PAGE_SIZE_4KB
 #define PM_DEFAULT_MASK PM_4K
+#elif defined(CONFIG_PAGE_SIZE_8KB)
+#define PM_DEFAULT_MASK PM_8K
 #elif defined(CONFIG_PAGE_SIZE_16KB)
 #define PM_DEFAULT_MASK PM_16K
+#elif defined(CONFIG_PAGE_SIZE_32KB)
+#define PM_DEFAULT_MASK PM_32K
 #elif defined(CONFIG_PAGE_SIZE_64KB)
 #define PM_DEFAULT_MASK PM_64K
 #else
diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
index fe7a88ea066..9f946e4ca05 100644
--- a/arch/mips/include/asm/page.h
+++ b/arch/mips/include/asm/page.h
@@ -23,6 +23,9 @@
 #ifdef CONFIG_PAGE_SIZE_16KB
 #define PAGE_SHIFT      14
 #endif
+#ifdef CONFIG_PAGE_SIZE_32KB
+#define PAGE_SHIFT      15
+#endif
 #ifdef CONFIG_PAGE_SIZE_64KB
 #define PAGE_SHIFT      16
 #endif
diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h
index 943515f0ef8..4ed9d1bba2b 100644
--- a/arch/mips/include/asm/pgtable-64.h
+++ b/arch/mips/include/asm/pgtable-64.h
@@ -83,6 +83,12 @@
 #define PMD_ORDER               0
 #define PTE_ORDER               0
 #endif
+#ifdef CONFIG_PAGE_SIZE_32KB
+#define PGD_ORDER               0
+#define PUD_ORDER               aieeee_attempt_to_allocate_pud
+#define PMD_ORDER               0
+#define PTE_ORDER               0
+#endif
 #ifdef CONFIG_PAGE_SIZE_64KB
 #define PGD_ORDER               0
 #define PUD_ORDER               aieeee_attempt_to_allocate_pud
diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h
index 676aa2ae191..143a48136a4 100644
--- a/arch/mips/include/asm/thread_info.h
+++ b/arch/mips/include/asm/thread_info.h
@@ -75,6 +75,9 @@ register struct thread_info *__current_thread_info __asm__("$28");
 #ifdef CONFIG_PAGE_SIZE_16KB
 #define THREAD_SIZE_ORDER (0)
 #endif
+#ifdef CONFIG_PAGE_SIZE_32KB
+#define THREAD_SIZE_ORDER (0)
+#endif
 #ifdef CONFIG_PAGE_SIZE_64KB
 #define THREAD_SIZE_ORDER (0)
 #endif
diff --git a/arch/mips/lib/dump_tlb.c b/arch/mips/lib/dump_tlb.c
index 779821cd54a..3f69725556a 100644
--- a/arch/mips/lib/dump_tlb.c
+++ b/arch/mips/lib/dump_tlb.c
@@ -19,6 +19,15 @@ static inline const char *msk2str(unsigned int mask)
         case PM_16K:    return "16kb";
         case PM_64K:    return "64kb";
         case PM_256K:   return "256kb";
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+        case PM_8K:     return "8kb";
+        case PM_32K:    return "32kb";
+        case PM_128K:   return "128kb";
+        case PM_512K:   return "512kb";
+        case PM_2M:     return "2Mb";
+        case PM_8M:     return "8Mb";
+        case PM_32M:    return "32Mb";
+#endif
 #ifndef CONFIG_CPU_VR41XX
         case PM_1M:     return "1Mb";
         case PM_4M:     return "4Mb";