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/*
* drivers/watchdog/orion_wdt.c
*
* Watchdog driver for Orion/Kirkwood processors
*
* Authors: Tomas Hlavacek <tmshlvck@gmail.com>
* Sylver Bruneau <sylver.bruneau@googlemail.com>
* Marek Behún <kabel@kernel.org>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <common.h>
#include <dm.h>
#include <clk.h>
#include <log.h>
#include <wdt.h>
#include <asm/global_data.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>
DECLARE_GLOBAL_DATA_PTR;
struct orion_wdt_priv {
void __iomem *reg;
int wdt_counter_offset;
void __iomem *rstout;
void __iomem *rstout_mask;
u32 timeout;
unsigned long clk_rate;
struct clk clk;
};
#define RSTOUT_ENABLE_BIT BIT(8)
#define RSTOUT_MASK_BIT BIT(10)
#define WDT_ENABLE_BIT BIT(8)
#define TIMER_CTRL 0x0000
#define TIMER_A370_STATUS 0x04
#define WDT_AXP_FIXED_ENABLE_BIT BIT(10)
#define WDT_A370_EXPIRED BIT(31)
static int orion_wdt_reset(struct udevice *dev)
{
struct orion_wdt_priv *priv = dev_get_priv(dev);
/* Reload watchdog duration */
writel(priv->clk_rate * priv->timeout,
priv->reg + priv->wdt_counter_offset);
return 0;
}
static int orion_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
{
struct orion_wdt_priv *priv = dev_get_priv(dev);
u32 reg;
priv->timeout = DIV_ROUND_UP(timeout_ms, 1000);
/* Enable the fixed watchdog clock input */
reg = readl(priv->reg + TIMER_CTRL);
reg |= WDT_AXP_FIXED_ENABLE_BIT;
writel(reg, priv->reg + TIMER_CTRL);
/* Set watchdog duration */
writel(priv->clk_rate * priv->timeout,
priv->reg + priv->wdt_counter_offset);
/* Clear the watchdog expiration bit */
reg = readl(priv->reg + TIMER_A370_STATUS);
reg &= ~WDT_A370_EXPIRED;
writel(reg, priv->reg + TIMER_A370_STATUS);
/* Enable watchdog timer */
reg = readl(priv->reg + TIMER_CTRL);
reg |= WDT_ENABLE_BIT;
writel(reg, priv->reg + TIMER_CTRL);
/* Enable reset on watchdog */
reg = readl(priv->rstout);
reg |= RSTOUT_ENABLE_BIT;
writel(reg, priv->rstout);
reg = readl(priv->rstout_mask);
reg &= ~RSTOUT_MASK_BIT;
writel(reg, priv->rstout_mask);
return 0;
}
static int orion_wdt_stop(struct udevice *dev)
{
struct orion_wdt_priv *priv = dev_get_priv(dev);
u32 reg;
/* Disable reset on watchdog */
reg = readl(priv->rstout_mask);
reg |= RSTOUT_MASK_BIT;
writel(reg, priv->rstout_mask);
reg = readl(priv->rstout);
reg &= ~RSTOUT_ENABLE_BIT;
writel(reg, priv->rstout);
/* Disable watchdog timer */
reg = readl(priv->reg + TIMER_CTRL);
reg &= ~WDT_ENABLE_BIT;
writel(reg, priv->reg + TIMER_CTRL);
return 0;
}
static inline bool save_reg_from_ofdata(struct udevice *dev, int index,
void __iomem **reg, int *offset)
{
fdt_addr_t addr;
fdt_size_t off;
addr = devfdt_get_addr_size_index(dev, index, &off);
if (addr == FDT_ADDR_T_NONE)
return false;
*reg = (void __iomem *) addr;
if (offset)
*offset = off;
return true;
}
static int orion_wdt_of_to_plat(struct udevice *dev)
{
struct orion_wdt_priv *priv = dev_get_priv(dev);
if (!save_reg_from_ofdata(dev, 0, &priv->reg,
&priv->wdt_counter_offset))
goto err;
if (!save_reg_from_ofdata(dev, 1, &priv->rstout, NULL))
goto err;
if (!save_reg_from_ofdata(dev, 2, &priv->rstout_mask, NULL))
goto err;
return 0;
err:
debug("%s: Could not determine Orion wdt IO addresses\n", __func__);
return -ENXIO;
}
static int orion_wdt_probe(struct udevice *dev)
{
struct orion_wdt_priv *priv = dev_get_priv(dev);
int ret;
debug("%s: Probing wdt%u\n", __func__, dev_seq(dev));
orion_wdt_stop(dev);
ret = clk_get_by_name(dev, "fixed", &priv->clk);
if (!ret)
priv->clk_rate = clk_get_rate(&priv->clk);
else
priv->clk_rate = 25000000;
return 0;
}
static const struct wdt_ops orion_wdt_ops = {
.start = orion_wdt_start,
.reset = orion_wdt_reset,
.stop = orion_wdt_stop,
};
static const struct udevice_id orion_wdt_ids[] = {
{ .compatible = "marvell,armada-380-wdt" },
{}
};
U_BOOT_DRIVER(orion_wdt) = {
.name = "orion_wdt",
.id = UCLASS_WDT,
.of_match = orion_wdt_ids,
.probe = orion_wdt_probe,
.priv_auto = sizeof(struct orion_wdt_priv),
.of_to_plat = orion_wdt_of_to_plat,
.ops = &orion_wdt_ops,
};
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