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Workaround buggy timer in raspberry pie by using our own timer

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implementation.
This commit is contained in:
Vladimir Serbinenko 2013-12-22 02:48:42 +01:00
parent eeb8499721
commit 5ad9f728eb
4 changed files with 37 additions and 7 deletions
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27
grub-core/kern/uboot/init.c
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@ -30,6 +30,7 @@
#include <grub/uboot/disk.h>
#include <grub/uboot/uboot.h>
#include <grub/uboot/api_public.h>
#include <grub/cpu/system.h>
extern char __bss_start[];
extern char _end[];
@ -69,6 +70,19 @@ uboot_timer_ms (void)
return (((grub_uint64_t) high) << 32) | cur;
}
#ifdef __arm__
static grub_uint64_t
rpi_timer_ms (void)
{
static grub_uint32_t last = 0, high = 0;
grub_uint32_t cur = *(volatile grub_uint32_t *) 0x20003004;
if (cur < last)
high++;
last = cur;
return grub_divmod64 ((((grub_uint64_t) high) << 32) | cur, 1000, 0);
}
#endif
void
grub_machine_init (void)
{
@ -106,8 +120,17 @@ grub_machine_init (void)
grub_uboot_probe_hardware ();
/* Initialise timer */
timer_start = grub_uboot_get_timer (0);
grub_install_get_time_ms (uboot_timer_ms);
#ifdef __arm__
if (grub_uboot_get_machine_type () == GRUB_ARM_MACHINE_TYPE_RASPBERRY_PI)
{
grub_install_get_time_ms (rpi_timer_ms);
}
else
#endif
{
timer_start = grub_uboot_get_timer (0);
grub_install_get_time_ms (uboot_timer_ms);
}
/* Initialize */
grub_ubootdisk_init ();