arm: Allow cleanup_before_linux() without disabling caches

This function is used before jumping to U-Boot, but in that case we don't
always want to disable caches.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>

diff --git a/arch/arm/cpu/armv7/cpu.c b/arch/arm/cpu/armv7/cpu.c
index c56417d..0b0e500 100644 (file)
--- a/arch/arm/cpu/armv7/cpu.c
+++ b/arch/arm/cpu/armv7/cpu.c
@@ -24,7 +24,7 @@
 
 void __weak cpu_cache_initialization(void){}
 
-int cleanup_before_linux(void)
+int cleanup_before_linux_select(int flags)
 {
        /*
         * this function is called just before we call linux
@@ -42,24 +42,30 @@ int cleanup_before_linux(void)
        icache_disable();
        invalidate_icache_all();
 
-       /*
-        * turn off D-cache
-        * dcache_disable() in turn flushes the d-cache and disables MMU
-        */
-       dcache_disable();
-       v7_outer_cache_disable();
+       if (flags & CBL_DISABLE_CACHES) {
+               /*
+               * turn off D-cache
+               * dcache_disable() in turn flushes the d-cache and disables MMU
+               */
+               dcache_disable();
+               v7_outer_cache_disable();
 
-       /*
-        * After D-cache is flushed and before it is disabled there may
-        * be some new valid entries brought into the cache. We are sure
-        * that these lines are not dirty and will not affect our execution.
-        * (because unwinding the call-stack and setting a bit in CP15 SCTLR
-        * is all we did during this. We have not pushed anything on to the
-        * stack. Neither have we affected any static data)
-        * So just invalidate the entire d-cache again to avoid coherency
-        * problems for kernel
-        */
-       invalidate_dcache_all();
+               /*
+               * After D-cache is flushed and before it is disabled there may
+               * be some new valid entries brought into the cache. We are
+               * sure that these lines are not dirty and will not affect our
+               * execution. (because unwinding the call-stack and setting a
+               * bit in CP15 SCTRL is all we did during this. We have not
+               * pushed anything on to the stack. Neither have we affected
+               * any static data) So just invalidate the entire d-cache again
+               * to avoid coherency problems for kernel
+               */
+               invalidate_dcache_all();
+       } else {
+               flush_dcache_all();
+               invalidate_icache_all();
+               icache_enable();
+       }
 
        /*
         * Some CPU need more cache attention before starting the kernel.
@@ -68,3 +74,8 @@ int cleanup_before_linux(void)
 
        return 0;
 }
+
+int cleanup_before_linux(void)
+{
+       return cleanup_before_linux_select(CBL_ALL);
+}

diff --git a/include/common.h b/include/common.h
index ea5aeb0..8f4b2ec 100644 (file)
--- a/include/common.h
+++ b/include/common.h
@@ -714,6 +714,21 @@ void       invalidate_dcache_range(unsigned long start, unsigned long stop);
 void   invalidate_dcache_all(void);
 void   invalidate_icache_all(void);
 
+enum {
+       /* Disable caches (else flush caches but leave them active) */
+       CBL_DISABLE_CACHES              = 1 << 0,
+       CBL_SHOW_BOOTSTAGE_REPORT       = 1 << 1,
+
+       CBL_ALL                         = 3,
+};
+
+/**
+ * Clean up ready for linux
+ *
+ * @param flags                Flags to control what is done
+ */
+int cleanup_before_linux_select(int flags);
+
 /* arch/$(ARCH)/lib/ticks.S */
 uint64_t get_ticks(void);
 void   wait_ticks    (unsigned long);