85xx: Round up frequency calculations to get reasonable output
eg. because of rounding error we can get 799Mhz instead of 800Mhz.
Introduced DIV_ROUND_UP and roundup taken from linux kernel.
Signed-off-by: Dejan Minic <minic@freescale.com>
Signed-off-by: Srikanth Srinivasan <srikanth.srinivasan@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Andy Fleming <afleming@freescale.com>
diff --git a/cpu/mpc85xx/cpu.c b/cpu/mpc85xx/cpu.c
index dcd8817..74b210c 100644
--- a/cpu/mpc85xx/cpu.c
+++ b/cpu/mpc85xx/cpu.c
@@ -116,22 +116,21 @@
get_sys_info(&sysinfo);
puts("Clock Configuration:\n");
- printf(" CPU:%4lu MHz, ", sysinfo.freqProcessor / 1000000);
- printf("CCB:%4lu MHz,\n", sysinfo.freqSystemBus / 1000000);
-
+ printf(" CPU:%4lu MHz, ", DIV_ROUND_UP(sysinfo.freqProcessor,1000000));
+ printf("CCB:%4lu MHz,\n", DIV_ROUND_UP(sysinfo.freqSystemBus,1000000));
ddr_ratio = ((gur->porpllsr) & 0x00003e00) >> 9;
switch (ddr_ratio) {
case 0x0:
printf(" DDR:%4lu MHz (%lu MT/s data rate), ",
- sysinfo.freqDDRBus / 2000000, sysinfo.freqDDRBus / 1000000);
+ DIV_ROUND_UP(sysinfo.freqDDRBus,2000000), DIV_ROUND_UP(sysinfo.freqDDRBus,1000000));
break;
case 0x7:
printf(" DDR:%4lu MHz (%lu MT/s data rate) (Synchronous), ",
- sysinfo.freqDDRBus / 2000000, sysinfo.freqDDRBus / 1000000);
+ DIV_ROUND_UP(sysinfo.freqDDRBus, 2000000), DIV_ROUND_UP(sysinfo.freqDDRBus, 1000000));
break;
default:
printf(" DDR:%4lu MHz (%lu MT/s data rate) (Asynchronous), ",
- sysinfo.freqDDRBus / 2000000, sysinfo.freqDDRBus / 1000000);
+ DIV_ROUND_UP(sysinfo.freqDDRBus, 2000000), DIV_ROUND_UP(sysinfo.freqDDRBus,1000000));
break;
}
@@ -154,7 +153,7 @@
clkdiv *= 2;
#endif
printf("LBC:%4lu MHz\n",
- sysinfo.freqSystemBus / 1000000 / clkdiv);
+ DIV_ROUND_UP(sysinfo.freqSystemBus, 1000000) / clkdiv);
} else {
printf("LBC: unknown (lcrr: 0x%08x)\n", lcrr);
}
diff --git a/include/common.h b/include/common.h
index aea181e..11b7d31 100644
--- a/include/common.h
+++ b/include/common.h
@@ -670,6 +670,9 @@
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
+#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
+
/* Multicore arch functions */
#ifdef CONFIG_MP
int cpu_status(int nr);