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STiH410: Add STi timer driver

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Add ARM global timer based timer

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Patrice Chotard 2017-02-21 13:37:05 +01:00 committed by Tom Rini
parent 94e9a4ef91
commit 347cb2edf9
3 changed files with 86 additions and 0 deletions
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7
drivers/timer/Kconfig
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@ -58,4 +58,11 @@ config AST_TIMER
This is mostly because they all share several registers which
makes it difficult to completely separate them.
config STI_TIMER
bool "STi timer support"
depends on TIMER
default y if ARCH_STI
help
Select this to enable a timer for STi devices.
endmenu

1
drivers/timer/Makefile
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@ -10,3 +10,4 @@ obj-$(CONFIG_SANDBOX_TIMER) += sandbox_timer.o
obj-$(CONFIG_X86_TSC_TIMER) += tsc_timer.o
obj-$(CONFIG_OMAP_TIMER) += omap-timer.o
obj-$(CONFIG_AST_TIMER) += ast_timer.o
obj-$(CONFIG_STI_TIMER) += sti-timer.o

78
drivers/timer/sti-timer.c Normal file
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@ -0,0 +1,78 @@
/*
* (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,
};