85xx: get_tbclk() speed up and rounding fix

Speed up get_tbclk() by referencing pre-computed bus clock
frequency value from global data instead of sys_info_t.  Fix
rounding of result to nearest; previously it was rounding
upwards.

Signed-off-by: James Yang <[email protected]>
Signed-off-by: Kumar Gala <[email protected]>

diff --git a/cpu/mpc85xx/cpu.c b/cpu/mpc85xx/cpu.c
index 0ac004db95c95a91bf97cdd0d2343f16f78e4dc8..4aac599e12d5c1df9a1307b9a3602c811afec534 100644 (file)
--- a/cpu/mpc85xx/cpu.c
+++ b/cpu/mpc85xx/cpu.c
@@ -30,6 +30,8 @@
 #include <command.h>
 #include <asm/cache.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 struct cpu_type {
        char name[15];
        u32 soc_ver;
@@ -201,11 +203,7 @@ int do_reset (cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
  */
 unsigned long get_tbclk (void)
 {
-
-       sys_info_t  sys_info;
-
-       get_sys_info(&sys_info);
-       return ((sys_info.freqSystemBus + 7L) / 8L);
+       return (gd->bus_clk + 4UL)/8UL;
 }