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>

3 files changed, 56 insertions, 0 deletions

diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index 2155265002..d0383f3d76 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -69,6 +69,9 @@ typedef struct global_data {
 	struct udevice	*dm_root_f;	/* Pre-relocation root instance */
 	struct list_head uclass_root;	/* Head of core tree */
 #endif
+#ifdef CONFIG_TIMER
+	struct udevice	*timer;	/* Timer instance for Driver Model */
+#endif
 
 	const void *fdt_blob;	/* Our device tree, NULL if none */
 	void *new_fdt;		/* Relocated FDT */
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index da41499872..330ecd2388 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -57,6 +57,7 @@ enum uclass_id {
 	UCLASS_SPI_GENERIC,	/* Generic SPI flash target */
 	UCLASS_SYSCON,		/* System configuration device */
 	UCLASS_THERMAL,		/* Thermal sensor */
+	UCLASS_TIMER,		/* Timer device */
 	UCLASS_TPM,		/* Trusted Platform Module TIS interface */
 	UCLASS_USB,		/* USB bus */
 	UCLASS_USB_DEV_GENERIC,	/* USB generic device */
diff --git a/include/timer.h b/include/timer.h
new file mode 100644
index 0000000000..cdf385d174
--- /dev/null
+++ b/include/timer.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _TIMER_H_
+#define _TIMER_H_
+
+/*
+ * Get the current timer count
+ *
+ * @dev: The Timer device
+ * @count: pointer that returns the current timer count
+ * @return: 0 if OK, -ve on error
+ */
+int timer_get_count(struct udevice *dev, unsigned long *count);
+/*
+ * Get the timer input clock frequency
+ *
+ * @dev: The Timer device
+ * @return: the timer input clock frequency
+ */
+unsigned long timer_get_rate(struct udevice *dev);
+
+/*
+ * struct timer_ops - Driver model Timer operations
+ *
+ * The uclass interface is implemented by all Timer devices which use
+ * driver model.
+ */
+struct timer_ops {
+	/*
+	 * Get the current timer count
+	 *
+	 * @dev: The Timer device
+	 * @count: pointer that returns the current timer count
+	 * @return: 0 if OK, -ve on error
+	 */
+	int (*get_count)(struct udevice *dev, unsigned long *count);
+};
+
+/*
+ * struct timer_dev_priv - information about a device used by the uclass
+ *
+ * @clock_rate: the timer input clock frequency
+ */
+struct timer_dev_priv {
+	unsigned long clock_rate;
+};
+
+#endif	/* _TIMER_H_ */