dm: implement a Timer uclass
Implement a Timer uclass to work with lib/time.c.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/Kconfig b/drivers/Kconfig
index c02f323..ba88b5e 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -58,6 +58,8 @@
source "drivers/thermal/Kconfig"
+source "drivers/timer/Kconfig"
+
source "drivers/tpm/Kconfig"
source "drivers/usb/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 1a30ad1..4f49bfd 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -48,6 +48,7 @@
obj-y += dfu/
obj-y += rtc/
obj-y += sound/
+obj-y += timer/
obj-y += tpm/
obj-y += twserial/
obj-y += video/
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
new file mode 100644
index 0000000..8e8d600
--- /dev/null
+++ b/drivers/timer/Kconfig
@@ -0,0 +1,12 @@
+menu "Timer Support"
+
+config TIMER
+ bool "Enable Driver Model for Timer drivers"
+ depends on DM
+ help
+ Enable driver model for Timer access. It uses the same API as
+ lib/time.c. But now implemented by the uclass. The first timer
+ will be used. The timer is usually a 32 bits free-running up
+ counter. There may be no real tick, and no timer interrupt.
+
+endmenu
diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
new file mode 100644
index 0000000..afb0009
--- /dev/null
+++ b/drivers/timer/Makefile
@@ -0,0 +1,7 @@
+#
+# Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-$(CONFIG_TIMER) += timer-uclass.o
diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c
new file mode 100644
index 0000000..12aee5b
--- /dev/null
+++ b/drivers/timer/timer-uclass.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <timer.h>
+
+/*
+ * Implement a Timer uclass to work with lib/time.c. The timer is usually
+ * a 32 bits free-running up counter. The get_rate() method is used to get
+ * the input clock frequency of the timer. The get_count() method is used
+ * get the current 32 bits count value. If the hardware is counting down,
+ * the value should be inversed inside the method. There may be no real
+ * tick, and no timer interrupt.
+ */
+
+int timer_get_count(struct udevice *dev, unsigned long *count)
+{
+ const struct timer_ops *ops = device_get_ops(dev);
+
+ if (!ops->get_count)
+ return -ENOSYS;
+
+ return ops->get_count(dev, count);
+}
+
+unsigned long timer_get_rate(struct udevice *dev)
+{
+ struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+ return uc_priv->clock_rate;
+}
+
+UCLASS_DRIVER(timer) = {
+ .id = UCLASS_TIMER,
+ .name = "timer",
+ .per_device_auto_alloc_size = sizeof(struct timer_dev_priv),
+};