[U-Boot] [PATCH v2 06/20] Add print_freq() to display frequencies nicely
Simon Glass
sjg at chromium.org
Wed Apr 29 04:25:08 CEST 2015
Add a function similar to print_size() that works for frequencies. It can
handle from Hz to GHz.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v2:
- Correct bugs in number output
include/display_options.h | 11 +++++++++++
lib/display_options.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 49 insertions(+)
diff --git a/include/display_options.h b/include/display_options.h
index 54bd41d..ac44c45 100644
--- a/include/display_options.h
+++ b/include/display_options.h
@@ -23,6 +23,17 @@
void print_size(uint64_t size, const char *suffix);
/**
+ * print_freq() - Print a frequency with a suffix
+ *
+ * Print frequencies as "x.xx GHz", "xxx KHz", etc as needed; allow for
+ * optional trailing string (like "\n")
+ *
+ * @freq: Frequency to print in Hz
+ * @suffix String to print after the frequency
+ */
+void print_freq(uint64_t freq, const char *suffix);
+
+/**
* print_buffer() - Print data buffer in hex and ascii form
*
* Data reads are buffered so that each memory address is only read once.
diff --git a/lib/display_options.c b/lib/display_options.c
index 3f32bcd..3a70e14 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 +23,43 @@ int display_options (void)
return 0;
}
+void print_freq(uint64_t freq, const char *s)
+{
+ unsigned long m = 0, n;
+ uint64_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 % d;
+ while (!(m % 10))
+ m /= 10;
+ }
+
+ 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;
--
2.2.0.rc0.207.ga3a616c
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