ARM: l2x0: Determine the cache size

The cache size is needed for to optimise range based
maintainance operations

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>

2 files changed, 12 insertions, 2 deletions

diff --git a/arch/arm/include/asm/hardware/cache-l2x0.h b/arch/arm/include/asm/hardware/cache-l2x0.h
index d833355569cb..4633d2a8817a 100644
--- a/arch/arm/include/asm/hardware/cache-l2x0.h
+++ b/arch/arm/include/asm/hardware/cache-l2x0.h
@@ -55,6 +55,7 @@
 #define L2X0_CACHE_ID_PART_MASK         (0xf << 6)
 #define L2X0_CACHE_ID_PART_L210         (1 << 6)
 #define L2X0_CACHE_ID_PART_L310         (3 << 6)
+#define L2X0_AUX_CTRL_WAY_SIZE_MASK     (0x3 << 17)
 
 #ifndef __ASSEMBLY__
 extern void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask);
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 9310d618070b..262c7529bcdb 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -28,6 +28,7 @@
 static void __iomem *l2x0_base;
 static DEFINE_SPINLOCK(l2x0_lock);
 static uint32_t l2x0_way_mask;  /* Bitmask of active ways */
+static uint32_t l2x0_size;
 
 static inline void cache_wait_way(void __iomem *reg, unsigned long mask)
 {
@@ -242,6 +243,7 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
 {
         __u32 aux;
         __u32 cache_id;
+        __u32 way_size = 0;
         int ways;
         const char *type;
 
@@ -276,6 +278,13 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
         l2x0_way_mask = (1 << ways) - 1;
 
         /*
+         * L2 cache Size =  Way size * Number of ways
+         */
+        way_size = (aux & L2X0_AUX_CTRL_WAY_SIZE_MASK) >> 17;
+        way_size = 1 << (way_size + 3);
+        l2x0_size = ways * way_size * SZ_1K;
+
+        /*
          * Check if l2x0 controller is already enabled.
          * If you are booting from non-secure mode
          * accessing the below registers will fault.
@@ -300,6 +309,6 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
         outer_cache.disable = l2x0_disable;
 
         printk(KERN_INFO "%s cache controller enabled\n", type);
-        printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x\n",
-                         ways, cache_id, aux);
+        printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d B\n",
+                        ways, cache_id, aux, l2x0_size);
 }