/*
|
* (C) Copyright 2017 Patrice Chotard <patrice.chotard@st.com>
|
*
|
* SPDX-License-Identifier: GPL-2.0+
|
*/
|
|
#include <common.h>
|
#include <dm.h>
|
#include <fdtdec.h>
|
#include <timer.h>
|
|
#include <asm/io.h>
|
#include <asm/arch-armv7/globaltimer.h>
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
struct sti_timer_priv {
|
struct globaltimer *global_timer;
|
};
|
|
static int sti_timer_get_count(struct udevice *dev, u64 *count)
|
{
|
struct sti_timer_priv *priv = dev_get_priv(dev);
|
struct globaltimer *global_timer = priv->global_timer;
|
u32 low, high;
|
u64 timer;
|
u32 old = readl(&global_timer->cnt_h);
|
|
while (1) {
|
low = readl(&global_timer->cnt_l);
|
high = readl(&global_timer->cnt_h);
|
if (old == high)
|
break;
|
else
|
old = high;
|
}
|
timer = high;
|
*count = (u64)((timer << 32) | low);
|
|
return 0;
|
}
|
|
static int sti_timer_probe(struct udevice *dev)
|
{
|
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
|
struct sti_timer_priv *priv = dev_get_priv(dev);
|
fdt_addr_t addr;
|
|
uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK;
|
|
/* get arm global timer base address */
|
addr = fdtdec_get_addr(gd->fdt_blob, dev_of_offset(dev), "reg");
|
priv->global_timer = (struct globaltimer *)addr;
|
|
/* init timer */
|
writel(0x01, &priv->global_timer->ctl);
|
|
return 0;
|
}
|
|
static const struct timer_ops sti_timer_ops = {
|
.get_count = sti_timer_get_count,
|
};
|
|
static const struct udevice_id sti_timer_ids[] = {
|
{ .compatible = "arm,cortex-a9-global-timer" },
|
{}
|
};
|
|
U_BOOT_DRIVER(sti_timer) = {
|
.name = "sti_timer",
|
.id = UCLASS_TIMER,
|
.of_match = sti_timer_ids,
|
.priv_auto_alloc_size = sizeof(struct sti_timer_priv),
|
.probe = sti_timer_probe,
|
.ops = &sti_timer_ops,
|
.flags = DM_FLAG_PRE_RELOC,
|
};
|
