ARM: OMAP4: Add L2 Cache Controller in Device Tree

Provide PL310 Level 2 Cache Controller Device Tree
support for OMAP4 based devices.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>

2 files changed, 14 insertions, 1 deletions

diff --git a/arch/arm/boot/dts/omap4.dtsi b/arch/arm/boot/dts/omap4.dtsi
index c7dc11feb9da..cb18d2a2971c 100644
--- a/arch/arm/boot/dts/omap4.dtsi
+++ b/arch/arm/boot/dts/omap4.dtsi
@@ -30,12 +30,21 @@
         cpus {
                 cpu@0 {
                         compatible = "arm,cortex-a9";
+                        next-level-cache = <&L2>;
                 };
                 cpu@1 {
                         compatible = "arm,cortex-a9";
+                        next-level-cache = <&L2>;
                 };
         };
 
+        L2: l2-cache-controller@48242000 {
+                compatible = "arm,pl310-cache";
+                reg = <0x48242000 0x1000>;
+                cache-unified;
+                cache-level = <2>;
+        };
+
         /*
          * The soc node represents the soc top level view. It is uses for IPs
          * that are not memory mapped in the MPU view or for the MPU itself.
diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index c29dee998a79..6f95992f37c6 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -16,6 +16,7 @@
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/memblock.h>
+#include <linux/of.h>
 
 #include <asm/hardware/gic.h>
 #include <asm/hardware/cache-l2x0.h>
@@ -171,7 +172,10 @@ static int __init omap_l2_cache_init(void)
         /* Enable PL310 L2 Cache controller */
         omap_smc1(0x102, 0x1);
 
-        l2x0_init(l2cache_base, aux_ctrl, L2X0_AUX_CTRL_MASK);
+        if (of_have_populated_dt())
+                l2x0_of_init(aux_ctrl, L2X0_AUX_CTRL_MASK);
+        else
+                l2x0_init(l2cache_base, aux_ctrl, L2X0_AUX_CTRL_MASK);
 
         /*
          * Override default outer_cache.disable with a OMAP4