Blackfin: convert early_printk EVT init to a loop

The EVT registers are all contiguous in the memory map, so using a loop to
initialize them all rather than hardcoding the list results in much better
generated code (a hardware loop rather than a whole bunch of individual
loads).

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/arch/blackfin/kernel/early_printk.c b/arch/blackfin/kernel/early_printk.c
index c8ad051..3302719 100644 (file)
--- a/arch/blackfin/kernel/early_printk.c
+++ b/arch/blackfin/kernel/early_printk.c
@@ -178,25 +178,15 @@ int __init setup_early_printk(char *buf)
 
 asmlinkage void __init init_early_exception_vectors(void)
 {
+       u32 evt;
        SSYNC();
 
        /* cannot program in software:
         * evt0 - emulation (jtag)
         * evt1 - reset
         */
-       bfin_write_EVT2(early_trap);
-       bfin_write_EVT3(early_trap);
-       bfin_write_EVT5(early_trap);
-       bfin_write_EVT6(early_trap);
-       bfin_write_EVT7(early_trap);
-       bfin_write_EVT8(early_trap);
-       bfin_write_EVT9(early_trap);
-       bfin_write_EVT10(early_trap);
-       bfin_write_EVT11(early_trap);
-       bfin_write_EVT12(early_trap);
-       bfin_write_EVT13(early_trap);
-       bfin_write_EVT14(early_trap);
-       bfin_write_EVT15(early_trap);
+       for (evt = EVT2; evt <= EVT15; evt += 4)
+               bfin_write32(evt, early_trap);
        CSYNC();
 
        /* Set all the return from interrupt, exception, NMI to a known place