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arm-coreboot: Support for vexpress timer.

This commit is contained in:
Vladimir Serbinenko 2017-05-08 21:26:36 +02:00 committed by Vincent Batts
parent 1895c3806b
commit 7b6c1ca1ac
1 changed files with 36 additions and 0 deletions
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36
grub-core/kern/arm/coreboot/timer.c
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@ -21,6 +21,7 @@
#include <grub/types.h>
#include <grub/err.h>
#include <grub/time.h>
#include <grub/fdtbus.h>
#include <grub/misc.h>
grub_uint64_t
@ -33,6 +34,39 @@ grub_uint32_t
grub_arm_pfr1(void);
static int have_timer = 0;
static volatile grub_uint32_t *sp804_regs;
static grub_uint64_t
sp804_get_time_ms (void)
{
static grub_uint32_t high, last_low;
grub_uint32_t low = ~sp804_regs[1];
if (last_low > low)
high++;
last_low = low;
return grub_divmod64 ((((grub_uint64_t) high) << 32) | low,
1000, 0);
}
static grub_err_t
sp804_attach(const struct grub_fdtbus_dev *dev)
{
if (have_timer)
return GRUB_ERR_NONE;
sp804_regs = grub_fdtbus_map_reg (dev, 0, 0);
if (!grub_fdtbus_is_mapping_valid (sp804_regs))
return grub_error (GRUB_ERR_IO, "could not map sp804: %p", sp804_regs);
grub_install_get_time_ms (sp804_get_time_ms);
have_timer = 1;
return GRUB_ERR_NONE;
}
struct grub_fdtbus_driver sp804 =
{
.compatible = "arm,sp804",
.attach = sp804_attach
};
static grub_uint32_t timer_frequency_in_khz;
static grub_uint64_t
@ -58,6 +92,8 @@ try_generic_timer (void)
void
grub_machine_timer_init (void)
{
grub_fdtbus_register (&sp804);
if (!have_timer)
try_generic_timer ();
if (!have_timer)