Add print_freq() to display frequencies nicely
Add a function similar to print_size() that works for frequencies. It can
handle from Hz to GHz.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/lib/display_options.c b/lib/display_options.c
index 3f32bcd..24d8f55 100644
--- a/lib/display_options.c
+++ b/lib/display_options.c
@@ -7,6 +7,7 @@
#include <config.h>
#include <common.h>
+#include <div64.h>
#include <inttypes.h>
#include <version.h>
#include <linux/ctype.h>
@@ -22,6 +23,47 @@
return 0;
}
+void print_freq(uint64_t freq, const char *s)
+{
+ unsigned long m = 0, n;
+ uint32_t f;
+ static const char names[] = {'G', 'M', 'K'};
+ unsigned long d = 1e9;
+ char c = 0;
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(names); i++, d /= 1000) {
+ if (freq >= d) {
+ c = names[i];
+ break;
+ }
+ }
+
+ if (!c) {
+ printf("%" PRIu64 " Hz%s", freq, s);
+ return;
+ }
+
+ f = do_div(freq, d);
+ n = freq;
+
+ /* If there's a remainder, show the first few digits */
+ if (f) {
+ m = f;
+ while (m > 1000)
+ m /= 10;
+ while (m && !(m % 10))
+ m /= 10;
+ if (m >= 100)
+ m = (m / 10) + (m % 100 >= 50);
+ }
+
+ printf("%lu", n);
+ if (m)
+ printf(".%ld", m);
+ printf(" %cHz%s", c, s);
+}
+
void print_size(uint64_t size, const char *s)
{
unsigned long m = 0, n;