[people/ms/u-boot.git] / drivers / timer / timer-uclass.c

/*
 * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
#include <errno.h>
#include <timer.h>

DECLARE_GLOBAL_DATA_PTR;

/*
 * Implement a timer uclass to work with lib/time.c. The timer is usually
 * a 32/64 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
 * to get the current 64 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, u64 *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;
}

static int timer_pre_probe(struct udevice *dev)
{
	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);

	uc_priv->clock_rate = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
					     "clock-frequency", 0);

	return 0;
}

u64 timer_conv_64(u32 count)
{
	/* increment tbh if tbl has rolled over */
	if (count < gd->timebase_l)
		gd->timebase_h++;
	gd->timebase_l = count;
	return ((u64)gd->timebase_h << 32) | gd->timebase_l;
}

int notrace dm_timer_init(void)
{
	const void *blob = gd->fdt_blob;
	struct udevice *dev = NULL;
	int node;
	int ret;

	if (gd->timer)
		return 0;

	/* Check for a chosen timer to be used for tick */
	node = fdtdec_get_chosen_node(blob, "tick-timer");
	if (node < 0) {
		/* No chosen timer, trying first available timer */
		ret = uclass_first_device(UCLASS_TIMER, &dev);
		if (ret)
			return ret;
		if (!dev)
			return -ENODEV;
	} else {
		if (uclass_get_device_by_of_offset(UCLASS_TIMER, node, &dev)) {
			/*
			 * If the timer is not marked to be bound before
			 * relocation, bind it anyway.
			 */
			if (node > 0 &&
			    !lists_bind_fdt(gd->dm_root, blob, node, &dev)) {
				ret = device_probe(dev);
				if (ret)
					return ret;
			}
		}
	}

	if (dev) {
		gd->timer = dev;
		return 0;
	}

	return -ENODEV;
}

UCLASS_DRIVER(timer) = {
	.id		= UCLASS_TIMER,
	.name		= "timer",
	.pre_probe	= timer_pre_probe,
	.flags		= DM_UC_FLAG_SEQ_ALIAS,
	.per_device_auto_alloc_size = sizeof(struct timer_dev_priv),
};
Commit	Line	Data
c8a7ba9e TC	1	/*
	2	* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include <common.h>
	8	#include <dm.h>
c8336975 M	9	#include <dm/lists.h>
c8336975 M	10	#include <dm/device-internal.h>
c8a7ba9e TC	11	#include <errno.h>
	12	#include <timer.h>
	13
579eb5a0 BM	14	DECLARE_GLOBAL_DATA_PTR;
579eb5a0 BM	15
c8a7ba9e	16	/*
435ae76e	17	* Implement a timer uclass to work with lib/time.c. The timer is usually
9ca07ebb	18	* a 32/64 bits free-running up counter. The get_rate() method is used to get
c8a7ba9e	19	* the input clock frequency of the timer. The get_count() method is used
9ca07ebb	20	* to get the current 64 bits count value. If the hardware is counting down,
c8a7ba9e TC	21	* the value should be inversed inside the method. There may be no real
	22	* tick, and no timer interrupt.
	23	*/
	24
9ca07ebb	25	int timer_get_count(struct udevice dev, u64 count)
c8a7ba9e TC	26	{
	27	const struct timer_ops *ops = device_get_ops(dev);
	28
	29	if (!ops->get_count)
	30	return -ENOSYS;
	31
	32	return ops->get_count(dev, count);
	33	}
	34
	35	unsigned long timer_get_rate(struct udevice *dev)
	36	{
	37	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	38
	39	return uc_priv->clock_rate;
	40	}
	41
579eb5a0 BM	42	static int timer_pre_probe(struct udevice *dev)
	43	{
	44	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	45
	46	uc_priv->clock_rate = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
	47	"clock-frequency", 0);
	48
	49	return 0;
	50	}
	51
9ca07ebb BM	52	u64 timer_conv_64(u32 count)
	53	{
	54	/* increment tbh if tbl has rolled over */
	55	if (count < gd->timebase_l)
	56	gd->timebase_h++;
	57	gd->timebase_l = count;
	58	return ((u64)gd->timebase_h << 32) \| gd->timebase_l;
	59	}
	60
c8336975 M	61	int notrace dm_timer_init(void)
	62	{
	63	const void *blob = gd->fdt_blob;
	64	struct udevice *dev = NULL;
	65	int node;
	66	int ret;
	67
	68	if (gd->timer)
	69	return 0;
	70
	71	/* Check for a chosen timer to be used for tick */
	72	node = fdtdec_get_chosen_node(blob, "tick-timer");
	73	if (node < 0) {
	74	/* No chosen timer, trying first available timer */
	75	ret = uclass_first_device(UCLASS_TIMER, &dev);
	76	if (ret)
	77	return ret;
	78	if (!dev)
	79	return -ENODEV;
	80	} else {
	81	if (uclass_get_device_by_of_offset(UCLASS_TIMER, node, &dev)) {
	82	/*
	83	* If the timer is not marked to be bound before
	84	* relocation, bind it anyway.
	85	*/
	86	if (node > 0 &&
	87	!lists_bind_fdt(gd->dm_root, blob, node, &dev)) {
	88	ret = device_probe(dev);
	89	if (ret)
	90	return ret;
	91	}
	92	}
	93	}
	94
	95	if (dev) {
	96	gd->timer = dev;
	97	return 0;
	98	}
	99
	100	return -ENODEV;
	101	}
	102
c8a7ba9e TC	103	UCLASS_DRIVER(timer) = {
	104	.id = UCLASS_TIMER,
	105	.name = "timer",
579eb5a0	106	.pre_probe = timer_pre_probe,
a5d80113	107	.flags = DM_UC_FLAG_SEQ_ALIAS,
c8a7ba9e TC	108	.per_device_auto_alloc_size = sizeof(struct timer_dev_priv),
c8a7ba9e TC	109	};