[J-u-boot.git] / drivers / timer / atmel_pit_timer.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2017 Microchip Corporation
 * 		      Wenyou.Yang <[email protected]>
 */

#include <common.h>
#include <clk.h>
#include <dm.h>
#include <timer.h>
#include <asm/io.h>
#include <linux/bitops.h>

#define AT91_PIT_VALUE		0xfffff
#define AT91_PIT_PITEN		BIT(24)		/* Timer Enabled */

struct atmel_pit_regs {
	u32	mode;
	u32	status;
	u32	value;
	u32	value_image;
};

struct atmel_pit_platdata {
	struct atmel_pit_regs *regs;
};

static u64 atmel_pit_get_count(struct udevice *dev)
{
	struct atmel_pit_platdata *plat = dev_get_platdata(dev);
	struct atmel_pit_regs *const regs = plat->regs;
	u32 val = readl(&regs->value_image);

	return timer_conv_64(val);
}

static int atmel_pit_probe(struct udevice *dev)
{
	struct atmel_pit_platdata *plat = dev_get_platdata(dev);
	struct atmel_pit_regs *const regs = plat->regs;
	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	struct clk clk;
	ulong clk_rate;
	int ret;

	ret = clk_get_by_index(dev, 0, &clk);
	if (ret)
		return -EINVAL;

	clk_rate = clk_get_rate(&clk);
	if (!clk_rate)
		return -EINVAL;

	uc_priv->clock_rate = clk_rate / 16;

	writel(AT91_PIT_VALUE | AT91_PIT_PITEN, &regs->mode);

	return 0;
}

static int atmel_pit_ofdata_to_platdata(struct udevice *dev)
{
	struct atmel_pit_platdata *plat = dev_get_platdata(dev);

	plat->regs = dev_read_addr_ptr(dev);

	return 0;
}

static const struct timer_ops atmel_pit_ops = {
	.get_count = atmel_pit_get_count,
};

static const struct udevice_id atmel_pit_ids[] = {
	{ .compatible = "atmel,at91sam9260-pit" },
	{ }
};

U_BOOT_DRIVER(atmel_pit) = {
	.name	= "atmel_pit",
	.id	= UCLASS_TIMER,
	.of_match = atmel_pit_ids,
	.ofdata_to_platdata = atmel_pit_ofdata_to_platdata,
	.platdata_auto	= sizeof(struct atmel_pit_platdata),
	.probe	= atmel_pit_probe,
	.ops	= &atmel_pit_ops,
};
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
47edaea4 WY	2	/*
	3	* Copyright (C) 2017 Microchip Corporation
	4	* Wenyou.Yang <[email protected]>
47edaea4 WY	5	*/
	6
	7	#include <common.h>
	8	#include <clk.h>
	9	#include <dm.h>
	10	#include <timer.h>
	11	#include <asm/io.h>
cd93d625	12	#include <linux/bitops.h>
47edaea4 WY	13
	14	#define AT91_PIT_VALUE 0xfffff
	15	#define AT91_PIT_PITEN BIT(24) /* Timer Enabled */
	16
	17	struct atmel_pit_regs {
	18	u32 mode;
	19	u32 status;
	20	u32 value;
	21	u32 value_image;
	22	};
	23
	24	struct atmel_pit_platdata {
	25	struct atmel_pit_regs *regs;
	26	};
	27
8af7bb91	28	static u64 atmel_pit_get_count(struct udevice *dev)
47edaea4 WY	29	{
	30	struct atmel_pit_platdata *plat = dev_get_platdata(dev);
	31	struct atmel_pit_regs *const regs = plat->regs;
	32	u32 val = readl(&regs->value_image);
	33
8af7bb91	34	return timer_conv_64(val);
47edaea4 WY	35	}
	36
	37	static int atmel_pit_probe(struct udevice *dev)
	38	{
	39	struct atmel_pit_platdata *plat = dev_get_platdata(dev);
	40	struct atmel_pit_regs *const regs = plat->regs;
	41	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	42	struct clk clk;
	43	ulong clk_rate;
	44	int ret;
	45
	46	ret = clk_get_by_index(dev, 0, &clk);
	47	if (ret)
	48	return -EINVAL;
	49
	50	clk_rate = clk_get_rate(&clk);
	51	if (!clk_rate)
	52	return -EINVAL;
	53
	54	uc_priv->clock_rate = clk_rate / 16;
	55
	56	writel(AT91_PIT_VALUE \| AT91_PIT_PITEN, &regs->mode);
	57
	58	return 0;
	59	}
	60
	61	static int atmel_pit_ofdata_to_platdata(struct udevice *dev)
	62	{
	63	struct atmel_pit_platdata *plat = dev_get_platdata(dev);
	64
702e57e1	65	plat->regs = dev_read_addr_ptr(dev);
47edaea4 WY	66
	67	return 0;
	68	}
	69
	70	static const struct timer_ops atmel_pit_ops = {
	71	.get_count = atmel_pit_get_count,
	72	};
	73
	74	static const struct udevice_id atmel_pit_ids[] = {
	75	{ .compatible = "atmel,at91sam9260-pit" },
	76	{ }
	77	};
	78
	79	U_BOOT_DRIVER(atmel_pit) = {
	80	.name = "atmel_pit",
	81	.id = UCLASS_TIMER,
	82	.of_match = atmel_pit_ids,
	83	.ofdata_to_platdata = atmel_pit_ofdata_to_platdata,
41575d8e	84	.platdata_auto = sizeof(struct atmel_pit_platdata),
47edaea4 WY	85	.probe = atmel_pit_probe,
47edaea4 WY	86	.ops = &atmel_pit_ops,
47edaea4	87	};