1 files changed, 27 insertions, 0 deletions

diff --git a/arch/xtensa/variants/s6000/delay.c b/arch/xtensa/variants/s6000/delay.c
new file mode 100644
index 000000000000..54b2b573f166
--- /dev/null
+++ b/arch/xtensa/variants/s6000/delay.c
@@ -0,0 +1,27 @@
+#include <asm/delay.h>
+#include <asm/timex.h>
+#include <asm/io.h>
+#include <variant/hardware.h>
+
+#define LOOPS 10
+void platform_calibrate_ccount(void)
+{
+        u32 uninitialized_var(a);
+        u32 uninitialized_var(u);
+        u32 b;
+        u32 tstamp = S6_REG_GREG1 + S6_GREG1_GLOBAL_TIMER;
+        int i = LOOPS+1;
+        do {
+                u32 t = u;
+                asm volatile(
+                "1:     l32i %0, %2, 0 ;"
+                "       beq %0, %1, 1b ;"
+                : "=&a"(u) : "a"(t), "a"(tstamp));
+                b = xtensa_get_ccount();
+                if (i == LOOPS)
+                        a = b;
+        } while (--i >= 0);
+        b -= a;
+        nsec_per_ccount = (LOOPS * 10000) / b;
+        ccount_per_jiffy = b * (100000UL / (LOOPS * HZ));
+}