[J-u-boot.git] / drivers / reset / reset-dra7.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Texas Instruments DRA7 reset driver
 *
 * Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
 * Author: Keerthy <[email protected]>
 */

#include <asm/io.h>
#include <dm.h>
#include <reset-uclass.h>
#include <dm/device_compat.h>

struct dra7_reset_priv {
	u32 rstctrl;
	u32 rstst;
	u8 nreset;
};

static inline void dra7_reset_rmw(u32 addr, u32 value, u32 mask)
{
	writel(((readl(addr) & (~mask)) | (value & mask)), addr);
}

static int dra7_reset_deassert(struct reset_ctl *reset_ctl)
{
	struct dra7_reset_priv *priv = dev_get_priv(reset_ctl->dev);
	int mask = 1 << reset_ctl->id;

	if (reset_ctl->id < 0 || reset_ctl->id >= priv->nreset)
		return -EINVAL;

	dra7_reset_rmw(priv->rstctrl, 0x0, mask);

	while ((readl(priv->rstst) & mask) != mask)
		;

	return 0;
}

static int dra7_reset_assert(struct reset_ctl *reset_ctl)
{
	struct dra7_reset_priv *priv = dev_get_priv(reset_ctl->dev);
	int mask = 1 << reset_ctl->id;

	if (reset_ctl->id < 0 || reset_ctl->id >= priv->nreset)
		return -EINVAL;

	dra7_reset_rmw(priv->rstctrl, mask, 0x0);

	return 0;
}

struct reset_ops dra7_reset_ops = {
	.rst_assert = dra7_reset_assert,
	.rst_deassert = dra7_reset_deassert,
};

static const struct udevice_id dra7_reset_ids[] = {
	{ .compatible = "ti,dra7-reset" },
	{ }
};

static int dra7_reset_probe(struct udevice *dev)
{
	struct dra7_reset_priv *priv = dev_get_priv(dev);

	priv->rstctrl = dev_read_addr(dev);
	priv->rstst = priv->rstctrl + 0x4;
	priv->nreset = dev_read_u32_default(dev, "ti,nresets", 1);

	dev_info(dev, "dra7-reset successfully probed %s\n", dev->name);

	return 0;
}

U_BOOT_DRIVER(dra7_reset) = {
	.name = "dra7_reset",
	.id = UCLASS_RESET,
	.of_match = dra7_reset_ids,
	.probe = dra7_reset_probe,
	.ops = &dra7_reset_ops,
	.priv_auto = sizeof(struct dra7_reset_priv),
};
Commit	Line	Data
795b2c47 K	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Texas Instruments DRA7 reset driver
	4	*
a94a4071	5	* Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
795b2c47 K	6	* Author: Keerthy <[email protected]>
	7	*/
	8
	9	#include <asm/io.h>
795b2c47 K	10	#include <dm.h>
	11	#include <reset-uclass.h>
	12	#include <dm/device_compat.h>
	13
	14	struct dra7_reset_priv {
	15	u32 rstctrl;
	16	u32 rstst;
	17	u8 nreset;
	18	};
	19
795b2c47 K	20	static inline void dra7_reset_rmw(u32 addr, u32 value, u32 mask)
	21	{
	22	writel(((readl(addr) & (~mask)) \| (value & mask)), addr);
	23	}
	24
	25	static int dra7_reset_deassert(struct reset_ctl *reset_ctl)
	26	{
	27	struct dra7_reset_priv *priv = dev_get_priv(reset_ctl->dev);
	28	int mask = 1 << reset_ctl->id;
	29
	30	if (reset_ctl->id < 0 \|\| reset_ctl->id >= priv->nreset)
	31	return -EINVAL;
	32
	33	dra7_reset_rmw(priv->rstctrl, 0x0, mask);
	34
	35	while ((readl(priv->rstst) & mask) != mask)
	36	;
	37
	38	return 0;
	39	}
	40
	41	static int dra7_reset_assert(struct reset_ctl *reset_ctl)
	42	{
	43	struct dra7_reset_priv *priv = dev_get_priv(reset_ctl->dev);
	44	int mask = 1 << reset_ctl->id;
	45
	46	if (reset_ctl->id < 0 \|\| reset_ctl->id >= priv->nreset)
	47	return -EINVAL;
	48
	49	dra7_reset_rmw(priv->rstctrl, mask, 0x0);
	50
	51	return 0;
	52	}
	53
	54	struct reset_ops dra7_reset_ops = {
795b2c47 K	55	.rst_assert = dra7_reset_assert,
	56	.rst_deassert = dra7_reset_deassert,
	57	};
	58
	59	static const struct udevice_id dra7_reset_ids[] = {
	60	{ .compatible = "ti,dra7-reset" },
	61	{ }
	62	};
	63
	64	static int dra7_reset_probe(struct udevice *dev)
	65	{
	66	struct dra7_reset_priv *priv = dev_get_priv(dev);
	67
	68	priv->rstctrl = dev_read_addr(dev);
	69	priv->rstst = priv->rstctrl + 0x4;
	70	priv->nreset = dev_read_u32_default(dev, "ti,nresets", 1);
	71
	72	dev_info(dev, "dra7-reset successfully probed %s\n", dev->name);
	73
	74	return 0;
	75	}
	76
	77	U_BOOT_DRIVER(dra7_reset) = {
	78	.name = "dra7_reset",
	79	.id = UCLASS_RESET,
	80	.of_match = dra7_reset_ids,
	81	.probe = dra7_reset_probe,
	82	.ops = &dra7_reset_ops,
	83	.priv_auto = sizeof(struct dra7_reset_priv),
	84	};