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dm: implement a Timer uclass

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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>
This commit is contained in:
Thomas Chou
2015-10-09 13:46:34 +08:00
parent bcae80e955
commit c8a7ba9e6a
9 changed files with 169 additions and 0 deletions
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3
include/asm-generic/global_data.h
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@@ -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 */

1
include/dm/uclass-id.h
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@@ -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 */

52
include/timer.h Normal file
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@@ -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_ */