armv8: Make COUNTER_FREQUENCY optional

Some platforms have the means to determine the counter frequency at
runtime, so give them an opportunity to do so.

Signed-off-by: Thierry Reding <[email protected]>
Acked-by: Stephen Warren <[email protected]>
Tested-by: Stephen Warren <[email protected]>
Signed-off-by: Tom Warren <[email protected]>

diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
index e70bed462a59f9c4d4f1583242f88d99aadb76a9..da45d984d01aa8880e36f9e4f538c57298438441 100644 (file)
--- a/arch/arm/cpu/armv8/start.S
+++ b/arch/arm/cpu/armv8/start.S
@@ -54,8 +54,10 @@ reset:
        orr     x0, x0, #0xf                    /* SCR_EL3.NS|IRQ|FIQ|EA */
        msr     scr_el3, x0
        msr     cptr_el3, xzr                   /* Enable FP/SIMD */
+#ifdef COUNTER_FREQUENCY
        ldr     x0, =COUNTER_FREQUENCY
        msr     cntfrq_el0, x0                  /* Initialize CNTFRQ */
+#endif
        b       0f
 2:     msr     vbar_el2, x0
        mov     x0, #0x33ff