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

/*
 * Copyright 2016 Google Inc.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <timer.h>
#include <asm/io.h>
#include <asm/arch/timer.h>

DECLARE_GLOBAL_DATA_PTR;

#define AST_TICK_TIMER  1
#define AST_TMC_RELOAD_VAL  0xffffffff

struct ast_timer_priv {
	struct ast_timer *regs;
	struct ast_timer_counter *tmc;
};

static struct ast_timer_counter *ast_get_timer_counter(struct ast_timer *timer,
						       int n)
{
	if (n > 3)
		return &timer->timers2[n - 4];
	else
		return &timer->timers1[n - 1];
}

static int ast_timer_probe(struct udevice *dev)
{
	struct ast_timer_priv *priv = dev_get_priv(dev);
	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);

	writel(AST_TMC_RELOAD_VAL, &priv->tmc->reload_val);

	/*
	 * Stop the timer. This will also load reload_val into
	 * the status register.
	 */
	clrbits_le32(&priv->regs->ctrl1,
		     AST_TMC_EN << AST_TMC_CTRL1_SHIFT(AST_TICK_TIMER));
	/* Start the timer from the fixed 1MHz clock. */
	setbits_le32(&priv->regs->ctrl1,
		     (AST_TMC_EN | AST_TMC_1MHZ) <<
		     AST_TMC_CTRL1_SHIFT(AST_TICK_TIMER));

	uc_priv->clock_rate = AST_TMC_RATE;

	return 0;
}

static int ast_timer_get_count(struct udevice *dev, u64 *count)
{
	struct ast_timer_priv *priv = dev_get_priv(dev);

	*count = AST_TMC_RELOAD_VAL - readl(&priv->tmc->status);

	return 0;
}

static int ast_timer_ofdata_to_platdata(struct udevice *dev)
{
	struct ast_timer_priv *priv = dev_get_priv(dev);

	priv->regs = devfdt_get_addr_ptr(dev);
	if (IS_ERR(priv->regs))
		return PTR_ERR(priv->regs);

	priv->tmc = ast_get_timer_counter(priv->regs, AST_TICK_TIMER);

	return 0;
}

static const struct timer_ops ast_timer_ops = {
	.get_count = ast_timer_get_count,
};

static const struct udevice_id ast_timer_ids[] = {
	{ .compatible = "aspeed,ast2500-timer" },
	{ .compatible = "aspeed,ast2400-timer" },
	{ }
};

U_BOOT_DRIVER(ast_timer) = {
	.name = "ast_timer",
	.id = UCLASS_TIMER,
	.of_match = ast_timer_ids,
	.probe = ast_timer_probe,
	.priv_auto_alloc_size = sizeof(struct ast_timer_priv),
	.ofdata_to_platdata = ast_timer_ofdata_to_platdata,
	.ops = &ast_timer_ops,
	.flags = DM_FLAG_PRE_RELOC,
};
Commit	Line	Data
4697abea	1	/*
	2	* Copyright 2016 Google Inc.
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include <common.h>
	8	#include <dm.h>
	9	#include <errno.h>
	10	#include <timer.h>
	11	#include <asm/io.h>
	12	#include <asm/arch/timer.h>
	13
	14	DECLARE_GLOBAL_DATA_PTR;
	15
	16	#define AST_TICK_TIMER 1
	17	#define AST_TMC_RELOAD_VAL 0xffffffff
	18
	19	struct ast_timer_priv {
	20	struct ast_timer *regs;
	21	struct ast_timer_counter *tmc;
	22	};
	23
	24	static struct ast_timer_counter ast_get_timer_counter(struct ast_timer timer,
	25	int n)
	26	{
	27	if (n > 3)
	28	return &timer->timers2[n - 4];
	29	else
	30	return &timer->timers1[n - 1];
	31	}
	32
	33	static int ast_timer_probe(struct udevice *dev)
	34	{
	35	struct ast_timer_priv *priv = dev_get_priv(dev);
	36	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	37
	38	writel(AST_TMC_RELOAD_VAL, &priv->tmc->reload_val);
	39
	40	/*
	41	* Stop the timer. This will also load reload_val into
	42	* the status register.
	43	*/
	44	clrbits_le32(&priv->regs->ctrl1,
	45	AST_TMC_EN << AST_TMC_CTRL1_SHIFT(AST_TICK_TIMER));
	46	/* Start the timer from the fixed 1MHz clock. */
	47	setbits_le32(&priv->regs->ctrl1,
	48	(AST_TMC_EN \| AST_TMC_1MHZ) <<
	49	AST_TMC_CTRL1_SHIFT(AST_TICK_TIMER));
	50
	51	uc_priv->clock_rate = AST_TMC_RATE;
	52
	53	return 0;
	54	}
	55
	56	static int ast_timer_get_count(struct udevice dev, u64 count)
	57	{
	58	struct ast_timer_priv *priv = dev_get_priv(dev);
	59
	60	*count = AST_TMC_RELOAD_VAL - readl(&priv->tmc->status);
	61
	62	return 0;
	63	}
	64
65	static int ast_timer_ofdata_to_platdata(struct udevice *dev)
66	{
67	struct ast_timer_priv *priv = dev_get_priv(dev);
68
a821c4af	69	priv->regs = devfdt_get_addr_ptr(dev);
4697abea	70	if (IS_ERR(priv->regs))
	71	return PTR_ERR(priv->regs);
	72
	73	priv->tmc = ast_get_timer_counter(priv->regs, AST_TICK_TIMER);
	74
	75	return 0;
	76	}
	77
	78	static const struct timer_ops ast_timer_ops = {
	79	.get_count = ast_timer_get_count,
	80	};
	81
	82	static const struct udevice_id ast_timer_ids[] = {
	83	{ .compatible = "aspeed,ast2500-timer" },
	84	{ .compatible = "aspeed,ast2400-timer" },
	85	{ }
	86	};
	87
	88	U_BOOT_DRIVER(ast_timer) = {
	89	.name = "ast_timer",
	90	.id = UCLASS_TIMER,
	91	.of_match = ast_timer_ids,
	92	.probe = ast_timer_probe,
	93	.priv_auto_alloc_size = sizeof(struct ast_timer_priv),
	94	.ofdata_to_platdata = ast_timer_ofdata_to_platdata,
	95	.ops = &ast_timer_ops,
	96	.flags = DM_FLAG_PRE_RELOC,
	97	};