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authorThomas Chou <thomas@wytron.com.tw>2015-10-09 13:46:34 +0800
committerThomas Chou <thomas@wytron.com.tw>2015-10-23 07:37:03 +0800
commitc8a7ba9e6a5fe2fc7b4a7894829aa0b0148b4d40 (patch)
tree6b6ca5091a7e6927ca2c27fcec0e0b195e1a64c2 /drivers/timer/timer-uclass.c
parentbcae80e9551bc0ba2d67e78bda57b9283b4bab12 (diff)
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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>
Diffstat (limited to 'drivers/timer/timer-uclass.c')
-rw-r--r--drivers/timer/timer-uclass.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c
new file mode 100644
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--- /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),
+};