[thirdparty/u-boot.git] / drivers / watchdog / cortina_wdt.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2020 Cortina-Access
 *
 */

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

#define CA_WDT_CTRL		0x00
#define CA_WDT_PS		0x04
#define CA_WDT_DIV		0x08
#define CA_WDT_LD		0x0C
#define CA_WDT_LOADE		0x10
#define CA_WDT_CNT		0x14
#define CA_WDT_IE		0x18
#define CA_WDT_INT		0x1C
#define CA_WDT_STAT		0x20

/* CA_WDT_CTRL */
#define CTL_WDT_EN		BIT(0)
#define CTL_WDT_RSTEN		BIT(1)
#define CTL_WDT_CLK_SEL		BIT(2)
/* CA_WDT_LOADE */
#define WDT_UPD			BIT(0)
#define WDT_UPD_PS		BIT(1)

/* Global config */
#define WDT_RESET_SUB		BIT(4)
#define WDT_RESET_ALL_BLOCK	BIT(6)
#define WDT_RESET_REMAP		BIT(7)
#define WDT_EXT_RESET		BIT(8)
#define WDT_RESET_DEFAULT	(WDT_EXT_RESET | WDT_RESET_REMAP | \
				 WDT_RESET_ALL_BLOCK | WDT_RESET_SUB)

struct ca_wdt_priv {
	void __iomem *base;
	void __iomem *global_config;
};

static void cortina_wdt_set_timeout(struct udevice *dev, u64 timeout_ms)
{
	struct ca_wdt_priv *priv = dev_get_priv(dev);

	/* Prescale using millisecond unit */
	writel(CORTINA_PER_IO_FREQ / 1000, priv->base + CA_WDT_PS);

	/* Millisecond */
	writel(1, priv->base + CA_WDT_DIV);

	writel(timeout_ms, priv->base + CA_WDT_LD);
	writel(WDT_UPD | WDT_UPD_PS, priv->base + CA_WDT_LOADE);
}

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

	cortina_wdt_set_timeout(dev, timeout);

	/* WDT Reset option */
	setbits_32(priv->global_config, WDT_RESET_DEFAULT);

	/* Enable WDT */
	setbits_32(priv->base, CTL_WDT_EN | CTL_WDT_RSTEN | CTL_WDT_CLK_SEL);

	return 0;
}

static int cortina_wdt_stop(struct udevice *dev)
{
	struct ca_wdt_priv *priv = dev_get_priv(dev);

	/* Disable WDT */
	writel(0, priv->base);

	return 0;
}

static int cortina_wdt_reset(struct udevice *dev)
{
	struct ca_wdt_priv *priv = dev_get_priv(dev);

	/* Reload WDT counter */
	writel(WDT_UPD, priv->base + CA_WDT_LOADE);

	return 0;
}

static int cortina_wdt_expire_now(struct udevice *dev, ulong flags)
{
	/* Set 1ms timeout to reset system */
	cortina_wdt_set_timeout(dev, 1);
	hang();

	return 0;
}

static int cortina_wdt_probe(struct udevice *dev)
{
	struct ca_wdt_priv *priv = dev_get_priv(dev);

	priv->base = dev_remap_addr_index(dev, 0);
	if (!priv->base)
		return -ENOENT;

	priv->global_config = dev_remap_addr_index(dev, 1);
	if (!priv->global_config)
		return -ENOENT;

	/* Stop WDT */
	cortina_wdt_stop(dev);

	return 0;
}

static const struct wdt_ops cortina_wdt_ops = {
	.start = cortina_wdt_start,
	.reset = cortina_wdt_reset,
	.stop = cortina_wdt_stop,
	.expire_now = cortina_wdt_expire_now,
};

static const struct udevice_id cortina_wdt_ids[] = {
	{.compatible = "cortina,ca-wdt"},
	{}
};

U_BOOT_DRIVER(cortina_wdt) = {
	.name = "cortina_wdt",
	.id = UCLASS_WDT,
	.probe = cortina_wdt_probe,
	.of_match = cortina_wdt_ids,
	.ops = &cortina_wdt_ops,
};
Commit	Line	Data
7f54b838 JL	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Copyright (C) 2020 Cortina-Access
	4	*
	5	*/
	6
d678a59d	7	#include <common.h>
7f54b838 JL	8	#include <dm.h>
	9	#include <hang.h>
	10	#include <asm/io.h>
	11	#include <wdt.h>
	12	#include <linux/bitops.h>
	13
	14	#define CA_WDT_CTRL 0x00
	15	#define CA_WDT_PS 0x04
	16	#define CA_WDT_DIV 0x08
	17	#define CA_WDT_LD 0x0C
	18	#define CA_WDT_LOADE 0x10
	19	#define CA_WDT_CNT 0x14
	20	#define CA_WDT_IE 0x18
	21	#define CA_WDT_INT 0x1C
	22	#define CA_WDT_STAT 0x20
	23
	24	/* CA_WDT_CTRL */
	25	#define CTL_WDT_EN BIT(0)
	26	#define CTL_WDT_RSTEN BIT(1)
	27	#define CTL_WDT_CLK_SEL BIT(2)
	28	/* CA_WDT_LOADE */
	29	#define WDT_UPD BIT(0)
	30	#define WDT_UPD_PS BIT(1)
	31
	32	/* Global config */
	33	#define WDT_RESET_SUB BIT(4)
	34	#define WDT_RESET_ALL_BLOCK BIT(6)
	35	#define WDT_RESET_REMAP BIT(7)
	36	#define WDT_EXT_RESET BIT(8)
	37	#define WDT_RESET_DEFAULT (WDT_EXT_RESET \| WDT_RESET_REMAP \| \
	38	WDT_RESET_ALL_BLOCK \| WDT_RESET_SUB)
	39
	40	struct ca_wdt_priv {
	41	void __iomem *base;
	42	void __iomem *global_config;
	43	};
	44
	45	static void cortina_wdt_set_timeout(struct udevice *dev, u64 timeout_ms)
	46	{
	47	struct ca_wdt_priv *priv = dev_get_priv(dev);
	48
	49	/* Prescale using millisecond unit */
	50	writel(CORTINA_PER_IO_FREQ / 1000, priv->base + CA_WDT_PS);
	51
	52	/* Millisecond */
	53	writel(1, priv->base + CA_WDT_DIV);
	54
	55	writel(timeout_ms, priv->base + CA_WDT_LD);
	56	writel(WDT_UPD \| WDT_UPD_PS, priv->base + CA_WDT_LOADE);
	57	}
	58
	59	static int cortina_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
	60	{
	61	struct ca_wdt_priv *priv = dev_get_priv(dev);
	62
	63	cortina_wdt_set_timeout(dev, timeout);
	64
	65	/* WDT Reset option */
	66	setbits_32(priv->global_config, WDT_RESET_DEFAULT);
	67
	68	/* Enable WDT */
	69	setbits_32(priv->base, CTL_WDT_EN \| CTL_WDT_RSTEN \| CTL_WDT_CLK_SEL);
	70
	71	return 0;
72	}
73
74	static int cortina_wdt_stop(struct udevice *dev)
75	{
76	struct ca_wdt_priv *priv = dev_get_priv(dev);
77
78	/* Disable WDT */
79	writel(0, priv->base);
80
81	return 0;
82	}
83
84	static int cortina_wdt_reset(struct udevice *dev)
85	{
86	struct ca_wdt_priv *priv = dev_get_priv(dev);
87
88	/* Reload WDT counter */
89	writel(WDT_UPD, priv->base + CA_WDT_LOADE);
90
91	return 0;
92	}
93
94	static int cortina_wdt_expire_now(struct udevice *dev, ulong flags)
95	{
96	/* Set 1ms timeout to reset system */
97	cortina_wdt_set_timeout(dev, 1);
98	hang();
99
100	return 0;
101	}
102
103	static int cortina_wdt_probe(struct udevice *dev)
104	{
105	struct ca_wdt_priv *priv = dev_get_priv(dev);
106
107	priv->base = dev_remap_addr_index(dev, 0);
108	if (!priv->base)
109	return -ENOENT;
110
111	priv->global_config = dev_remap_addr_index(dev, 1);
112	if (!priv->global_config)
113	return -ENOENT;
114
115	/* Stop WDT */
116	cortina_wdt_stop(dev);
117
118	return 0;
119	}
120
121	static const struct wdt_ops cortina_wdt_ops = {
122	.start = cortina_wdt_start,
123	.reset = cortina_wdt_reset,
124	.stop = cortina_wdt_stop,
125	.expire_now = cortina_wdt_expire_now,
126	};
127
128	static const struct udevice_id cortina_wdt_ids[] = {
129	{.compatible = "cortina,ca-wdt"},
130	{}
131	};
132
133	U_BOOT_DRIVER(cortina_wdt) = {
134	.name = "cortina_wdt",
135	.id = UCLASS_WDT,
136	.probe = cortina_wdt_probe,
137	.of_match = cortina_wdt_ids,
138	.ops = &cortina_wdt_ops,
139	};