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libpayload: pistachio: fix timer implementation 

timer_raw_value must return the number of CPU ticks, and not
the time obtained by dividing the ticks by the CPU frequency.
The CPU counter is increased at every 2 CPU clocks
and therfore the number of ticks will be the counter value
multiplied by 2.

BUG=chrome-os-partner:31438
TEST=tested on Pistachio FPGA; it works properly.
BRANCH=none

Change-Id: Iae62cb328e882f84822250bdf72146321ca9bbe0
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 7ab25ce7dcaffb453ee774d870963a56444d46af
Original-Change-Id: I74408950900463a2c054d5aebd3edb005a325adb
Original-Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/242393
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/8744
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Ionela Voinescu 2015-01-22 14:53:28 +00:00 committed by Patrick Georgi
parent 66fc77d3af
commit b29a67d8c8
1 changed files with 1 additions and 6 deletions
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7
payloads/libpayload/drivers/timer/img_pistachio.c
View File

@ -20,11 +20,6 @@
#include <libpayload.h> #include <libpayload.h>
#include <arch/cpu.h> #include <arch/cpu.h>
static int get_timer_speed_khz(void)
{
return get_cpu_speed()/2;
}
uint64_t timer_hz(void) uint64_t timer_hz(void)
{ {
return lib_sysinfo.cpu_khz * 1000; return lib_sysinfo.cpu_khz * 1000;
@ -32,5 +27,5 @@ uint64_t timer_hz(void)
uint64_t timer_raw_value(void) uint64_t timer_raw_value(void)
{ {
return read_c0_count()/(get_timer_speed_khz()/1000); return read_c0_count() * 2;
} }