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 ---
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;