[people/ms/u-boot.git] / drivers / watchdog / bcm6345_wdt.c

/*
 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
 *
 * Derived from linux/drivers/watchdog/bcm63xx_wdt.c:
 *	Copyright (C) 2007 Miguel Gaio <miguel.gaio@efixo.com>
 *	Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
 *
 * SPDX-License-Identifier: GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <wdt.h>
#include <asm/io.h>

/* WDT Value register */
#define WDT_VAL_REG		0x0
#define WDT_VAL_MIN		0x00000002
#define WDT_VAL_MAX		0xfffffffe

/* WDT Control register */
#define WDT_CTL_REG		0x4
#define WDT_CTL_START1_MASK	0x0000ff00
#define WDT_CTL_START2_MASK	0x000000ff
#define WDT_CTL_STOP1_MASK	0x0000ee00
#define WDT_CTL_STOP2_MASK	0x000000ee

struct bcm6345_wdt_priv {
	void __iomem *regs;
};

static int bcm6345_wdt_reset(struct udevice *dev)
{
	struct bcm6345_wdt_priv *priv = dev_get_priv(dev);

	writel_be(WDT_CTL_START1_MASK, priv->regs + WDT_CTL_REG);
	writel_be(WDT_CTL_START2_MASK, priv->regs + WDT_CTL_REG);

	return 0;
}

static int bcm6345_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
{
	struct bcm6345_wdt_priv *priv = dev_get_priv(dev);

	if (timeout < WDT_VAL_MIN) {
		debug("watchdog won't fire with less than 2 ticks\n");
		timeout = WDT_VAL_MIN;
	} else if (timeout > WDT_VAL_MAX) {
		debug("maximum watchdog timeout exceeded\n");
		timeout = WDT_VAL_MAX;
	}

	writel_be(timeout, priv->regs + WDT_VAL_REG);

	return bcm6345_wdt_reset(dev);
}

static int bcm6345_wdt_expire_now(struct udevice *dev, ulong flags)
{
	return bcm6345_wdt_start(dev, WDT_VAL_MIN, flags);
}

static int bcm6345_wdt_stop(struct udevice *dev)
{
	struct bcm6345_wdt_priv *priv = dev_get_priv(dev);

	writel_be(WDT_CTL_STOP1_MASK, priv->regs + WDT_CTL_REG);
	writel_be(WDT_CTL_STOP2_MASK, priv->regs + WDT_CTL_REG);

	return 0;
}

static const struct wdt_ops bcm6345_wdt_ops = {
	.expire_now = bcm6345_wdt_expire_now,
	.reset = bcm6345_wdt_reset,
	.start = bcm6345_wdt_start,
	.stop = bcm6345_wdt_stop,
};

static const struct udevice_id bcm6345_wdt_ids[] = {
	{ .compatible = "brcm,bcm6345-wdt" },
	{ /* sentinel */ }
};

static int bcm6345_wdt_probe(struct udevice *dev)
{
	struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
	fdt_addr_t addr;
	fdt_size_t size;

	addr = devfdt_get_addr_size_index(dev, 0, &size);
	if (addr == FDT_ADDR_T_NONE)
		return -EINVAL;

	priv->regs = ioremap(addr, size);

	bcm6345_wdt_stop(dev);

	return 0;
}

U_BOOT_DRIVER(wdt_bcm6345) = {
	.name = "wdt_bcm6345",
	.id = UCLASS_WDT,
	.of_match = bcm6345_wdt_ids,
	.ops = &bcm6345_wdt_ops,
	.priv_auto_alloc_size = sizeof(struct bcm6345_wdt_priv),
	.probe = bcm6345_wdt_probe,
};
Commit	Line	Data
77331934 ÁFR	1	/*
	2	* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
	3	*
	4	* Derived from linux/drivers/watchdog/bcm63xx_wdt.c:
	5	* Copyright (C) 2007 Miguel Gaio <miguel.gaio@efixo.com>
	6	* Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
	7	*
	8	* SPDX-License-Identifier: GPL-2.0+
	9	*/
	10
	11	#include <common.h>
	12	#include <dm.h>
	13	#include <wdt.h>
	14	#include <asm/io.h>
	15
	16	/* WDT Value register */
	17	#define WDT_VAL_REG 0x0
	18	#define WDT_VAL_MIN 0x00000002
	19	#define WDT_VAL_MAX 0xfffffffe
	20
	21	/* WDT Control register */
	22	#define WDT_CTL_REG 0x4
	23	#define WDT_CTL_START1_MASK 0x0000ff00
	24	#define WDT_CTL_START2_MASK 0x000000ff
	25	#define WDT_CTL_STOP1_MASK 0x0000ee00
	26	#define WDT_CTL_STOP2_MASK 0x000000ee
	27
	28	struct bcm6345_wdt_priv {
	29	void __iomem *regs;
	30	};
	31
	32	static int bcm6345_wdt_reset(struct udevice *dev)
	33	{
	34	struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
	35
	36	writel_be(WDT_CTL_START1_MASK, priv->regs + WDT_CTL_REG);
	37	writel_be(WDT_CTL_START2_MASK, priv->regs + WDT_CTL_REG);
	38
	39	return 0;
	40	}
	41
	42	static int bcm6345_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
	43	{
	44	struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
	45
	46	if (timeout < WDT_VAL_MIN) {
	47	debug("watchdog won't fire with less than 2 ticks\n");
	48	timeout = WDT_VAL_MIN;
	49	} else if (timeout > WDT_VAL_MAX) {
	50	debug("maximum watchdog timeout exceeded\n");
	51	timeout = WDT_VAL_MAX;
	52	}
	53
	54	writel_be(timeout, priv->regs + WDT_VAL_REG);
	55
	56	return bcm6345_wdt_reset(dev);
	57	}
	58
	59	static int bcm6345_wdt_expire_now(struct udevice *dev, ulong flags)
	60	{
	61	return bcm6345_wdt_start(dev, WDT_VAL_MIN, flags);
	62	}
	63
	64	static int bcm6345_wdt_stop(struct udevice *dev)
65	{
66	struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
67
68	writel_be(WDT_CTL_STOP1_MASK, priv->regs + WDT_CTL_REG);
69	writel_be(WDT_CTL_STOP2_MASK, priv->regs + WDT_CTL_REG);
70
71	return 0;
72	}
73
74	static const struct wdt_ops bcm6345_wdt_ops = {
75	.expire_now = bcm6345_wdt_expire_now,
76	.reset = bcm6345_wdt_reset,
77	.start = bcm6345_wdt_start,
78	.stop = bcm6345_wdt_stop,
79	};
80
81	static const struct udevice_id bcm6345_wdt_ids[] = {
82	{ .compatible = "brcm,bcm6345-wdt" },
83	{ /* sentinel */ }
84	};
85
86	static int bcm6345_wdt_probe(struct udevice *dev)
87	{
88	struct bcm6345_wdt_priv *priv = dev_get_priv(dev);
89	fdt_addr_t addr;
90	fdt_size_t size;
91
a821c4af	92	addr = devfdt_get_addr_size_index(dev, 0, &size);
77331934 ÁFR	93	if (addr == FDT_ADDR_T_NONE)
	94	return -EINVAL;
	95
	96	priv->regs = ioremap(addr, size);
	97
	98	bcm6345_wdt_stop(dev);
	99
	100	return 0;
	101	}
	102
	103	U_BOOT_DRIVER(wdt_bcm6345) = {
	104	.name = "wdt_bcm6345",
	105	.id = UCLASS_WDT,
	106	.of_match = bcm6345_wdt_ids,
	107	.ops = &bcm6345_wdt_ops,
	108	.priv_auto_alloc_size = sizeof(struct bcm6345_wdt_priv),
	109	.probe = bcm6345_wdt_probe,
	110	};