From: Patrice Chotard <patrice.chot...@st.com>
Add ARM global timer based timer
Signed-off-by: Patrice Chotard <patrice.chot...@st.com>
Reviewed-by: Simon Glass <s...@chromium.org>
---
drivers/timer/Kconfig | 7 +++++
drivers/timer/Makefile | 1 +
drivers/timer/sti-timer.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 86 insertions(+)
create mode 100644 drivers/timer/sti-timer.c
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index cd38a6d..72c1416 100644
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -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
diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index a4b1a48..ae94be8 100644
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -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
diff --git a/drivers/timer/sti-timer.c b/drivers/timer/sti-timer.c
new file mode 100644
index 0000000..e1419c4
--- /dev/null
+++ b/drivers/timer/sti-timer.c
@@ -0,0 +1,78 @@
+/*
+ * (C) Copyright 2017 Patrice Chotard <patrice.chot...@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,
+};
--
1.9.1
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