Merge branch 'l2x0-pull-rmk' of git://dev.omapzoom.org/pub/scm/santosh/kernel-omap4-base into devel-stable

7 files changed, 171 insertions, 9 deletions

diff --git a/arch/arm/include/asm/hardware/cache-l2x0.h b/arch/arm/include/asm/hardware/cache-l2x0.h
index 351ca8d02aa7..cc42d5fdee17 100644
--- a/arch/arm/include/asm/hardware/cache-l2x0.h
+++ b/arch/arm/include/asm/hardware/cache-l2x0.h
@@ -21,9 +21,6 @@
 #define __ASM_ARM_HARDWARE_L2X0_H
 
 #define L2X0_CACHE_ID                   0x000
-#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_CACHE_TYPE                 0x004
 #define L2X0_CTRL                       0x100
 #define L2X0_AUX_CTRL                   0x104
@@ -58,6 +55,12 @@
 #define   L2X0_DYNAMIC_CLK_GATING_EN    (1 << 1)
 #define   L2X0_STNDBY_MODE_EN           (1 << 0)
 
+/* Registers shifts and masks */
+#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);
 #endif
diff --git a/arch/arm/include/asm/outercache.h b/arch/arm/include/asm/outercache.h
index 25f76bae57ab..fc1900925275 100644
--- a/arch/arm/include/asm/outercache.h
+++ b/arch/arm/include/asm/outercache.h
@@ -25,6 +25,9 @@ struct outer_cache_fns {
         void (*inv_range)(unsigned long, unsigned long);
         void (*clean_range)(unsigned long, unsigned long);
         void (*flush_range)(unsigned long, unsigned long);
+        void (*flush_all)(void);
+        void (*inv_all)(void);
+        void (*disable)(void);
 #ifdef CONFIG_OUTER_CACHE_SYNC
         void (*sync)(void);
 #endif
@@ -50,6 +53,24 @@ static inline void outer_flush_range(unsigned long start, unsigned long end)
                 outer_cache.flush_range(start, end);
 }
 
+static inline void outer_flush_all(void)
+{
+        if (outer_cache.flush_all)
+                outer_cache.flush_all();
+}
+
+static inline void outer_inv_all(void)
+{
+        if (outer_cache.inv_all)
+                outer_cache.inv_all();
+}
+
+static inline void outer_disable(void)
+{
+        if (outer_cache.disable)
+                outer_cache.disable();
+}
+
 #else
 
 static inline void outer_inv_range(unsigned long start, unsigned long end)
@@ -58,6 +79,9 @@ static inline void outer_clean_range(unsigned long start, unsigned long end)
 { }
 static inline void outer_flush_range(unsigned long start, unsigned long end)
 { }
+static inline void outer_flush_all(void) { }
+static inline void outer_inv_all(void) { }
+static inline void outer_disable(void) { }
 
 #endif
 
diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index 1fc74cbd1a19..3a8fd5140d7a 100644
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -78,7 +78,10 @@ void machine_kexec(struct kimage *image)
         local_fiq_disable();
         setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
         flush_cache_all();
+        outer_flush_all();
+        outer_disable();
         cpu_proc_fin();
+        outer_inv_all();
         flush_cache_all();
         cpu_reset(reboot_code_buffer_phys);
 }
diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index 923f9f5f91ce..2f895553e6a8 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -44,6 +44,13 @@ void __init gic_init_irq(void)
 }
 
 #ifdef CONFIG_CACHE_L2X0
+
+static void omap4_l2x0_disable(void)
+{
+        /* Disable PL310 L2 Cache controller */
+        omap_smc1(0x102, 0x0);
+}
+
 static int __init omap_l2_cache_init(void)
 {
         /*
@@ -70,6 +77,12 @@ static int __init omap_l2_cache_init(void)
         else
                 l2x0_init(l2cache_base, 0x0e070000, 0xc0000fff);
 
+        /*
+         * Override default outer_cache.disable with a OMAP4
+         * specific one
+        */
+        outer_cache.disable = omap4_l2x0_disable;
+
         return 0;
 }
 early_initcall(omap_l2_cache_init);
diff --git a/arch/arm/mach-ux500/cpu.c b/arch/arm/mach-ux500/cpu.c
index e0fd747e447a..73fb1a551ec6 100644
--- a/arch/arm/mach-ux500/cpu.c
+++ b/arch/arm/mach-ux500/cpu.c
@@ -10,6 +10,7 @@
 #include <linux/io.h>
 #include <linux/clk.h>
 
+#include <asm/cacheflush.h>
 #include <asm/hardware/cache-l2x0.h>
 #include <asm/hardware/gic.h>
 #include <asm/mach/map.h>
@@ -71,6 +72,46 @@ void __init ux500_init_irq(void)
 }
 
 #ifdef CONFIG_CACHE_L2X0
+static inline void ux500_cache_wait(void __iomem *reg, unsigned long mask)
+{
+        /* wait for the operation to complete */
+        while (readl(reg) & mask)
+                ;
+}
+
+static inline void ux500_cache_sync(void)
+{
+        void __iomem *base = __io_address(UX500_L2CC_BASE);
+        writel(0, base + L2X0_CACHE_SYNC);
+        ux500_cache_wait(base + L2X0_CACHE_SYNC, 1);
+}
+
+/*
+ * The L2 cache cannot be turned off in the non-secure world.
+ * Dummy until a secure service is in place.
+ */
+static void ux500_l2x0_disable(void)
+{
+}
+
+/*
+ * This is only called when doing a kexec, just after turning off the L2
+ * and L1 cache, and it is surrounded by a spinlock in the generic version.
+ * However, we're not really turning off the L2 cache right now and the
+ * PL310 does not support exclusive accesses (used to implement the spinlock).
+ * So, the invalidation needs to be done without the spinlock.
+ */
+static void ux500_l2x0_inv_all(void)
+{
+        void __iomem *l2x0_base = __io_address(UX500_L2CC_BASE);
+        uint32_t l2x0_way_mask = (1<<16) - 1;   /* Bitmask of active ways */
+
+        /* invalidate all ways */
+        writel(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
+        ux500_cache_wait(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
+        ux500_cache_sync();
+}
+
 static int ux500_l2x0_init(void)
 {
         void __iomem *l2x0_base;
@@ -80,6 +121,10 @@ static int ux500_l2x0_init(void)
         /* 64KB way size, 8 way associativity, force WA */
         l2x0_init(l2x0_base, 0x3e060000, 0xc0000fff);
 
+        /* Override invalidate function */
+        outer_cache.disable = ux500_l2x0_disable;
+        outer_cache.inv_all = ux500_l2x0_inv_all;
+
         return 0;
 }
 early_initcall(ux500_l2x0_init);
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index a0a2928ae4dd..4414a01e1e8a 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -779,6 +779,14 @@ config CACHE_L2X0
         help
           This option enables the L2x0 PrimeCell.
 
+config CACHE_PL310
+        bool
+        depends on CACHE_L2X0
+        default y if CPU_V7 && !CPU_V6
+        help
+          This option enables optimisations for the PL310 cache
+          controller.
+
 config CACHE_TAUROS2
         bool "Enable the Tauros2 L2 cache controller"
         depends on (ARCH_DOVE || ARCH_MMP)
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 9982eb385c0f..170c9bb95866 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -28,14 +28,24 @@
 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(void __iomem *reg, unsigned long mask)
+static inline void cache_wait_way(void __iomem *reg, unsigned long mask)
 {
-        /* wait for the operation to complete */
+        /* wait for cache operation by line or way to complete */
         while (readl_relaxed(reg) & mask)
                 ;
 }
 
+#ifdef CONFIG_CACHE_PL310
+static inline void cache_wait(void __iomem *reg, unsigned long mask)
+{
+        /* cache operations by line are atomic on PL310 */
+}
+#else
+#define cache_wait      cache_wait_way
+#endif
+
 static inline void cache_sync(void)
 {
         void __iomem *base = l2x0_base;
@@ -103,14 +113,40 @@ static void l2x0_cache_sync(void)
         spin_unlock_irqrestore(&l2x0_lock, flags);
 }
 
-static inline void l2x0_inv_all(void)
+static void l2x0_flush_all(void)
+{
+        unsigned long flags;
+
+        /* clean all ways */
+        spin_lock_irqsave(&l2x0_lock, flags);
+        writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_INV_WAY);
+        cache_wait_way(l2x0_base + L2X0_CLEAN_INV_WAY, l2x0_way_mask);
+        cache_sync();
+        spin_unlock_irqrestore(&l2x0_lock, flags);
+}
+
+static void l2x0_clean_all(void)
+{
+        unsigned long flags;
+
+        /* clean all ways */
+        spin_lock_irqsave(&l2x0_lock, flags);
+        writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_WAY);
+        cache_wait_way(l2x0_base + L2X0_CLEAN_WAY, l2x0_way_mask);
+        cache_sync();
+        spin_unlock_irqrestore(&l2x0_lock, flags);
+}
+
+static void l2x0_inv_all(void)
 {
         unsigned long flags;
 
         /* invalidate all ways */
         spin_lock_irqsave(&l2x0_lock, flags);
+        /* Invalidating when L2 is enabled is a nono */
+        BUG_ON(readl(l2x0_base + L2X0_CTRL) & 1);
         writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
-        cache_wait(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
+        cache_wait_way(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
         cache_sync();
         spin_unlock_irqrestore(&l2x0_lock, flags);
 }
@@ -159,6 +195,11 @@ static void l2x0_clean_range(unsigned long start, unsigned long end)
         void __iomem *base = l2x0_base;
         unsigned long flags;
 
+        if ((end - start) >= l2x0_size) {
+                l2x0_clean_all();
+                return;
+        }
+
         spin_lock_irqsave(&l2x0_lock, flags);
         start &= ~(CACHE_LINE_SIZE - 1);
         while (start < end) {
@@ -184,6 +225,11 @@ static void l2x0_flush_range(unsigned long start, unsigned long end)
         void __iomem *base = l2x0_base;
         unsigned long flags;
 
+        if ((end - start) >= l2x0_size) {
+                l2x0_flush_all();
+                return;
+        }
+
         spin_lock_irqsave(&l2x0_lock, flags);
         start &= ~(CACHE_LINE_SIZE - 1);
         while (start < end) {
@@ -206,10 +252,20 @@ static void l2x0_flush_range(unsigned long start, unsigned long end)
         spin_unlock_irqrestore(&l2x0_lock, flags);
 }
 
+static void l2x0_disable(void)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&l2x0_lock, flags);
+        writel(0, l2x0_base + L2X0_CTRL);
+        spin_unlock_irqrestore(&l2x0_lock, flags);
+}
+
 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;
 
@@ -244,6 +300,13 @@ 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.
@@ -263,8 +326,11 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
         outer_cache.clean_range = l2x0_clean_range;
         outer_cache.flush_range = l2x0_flush_range;
         outer_cache.sync = l2x0_cache_sync;
+        outer_cache.flush_all = l2x0_flush_all;
+        outer_cache.inv_all = l2x0_inv_all;
+        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);
 }