mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-07 05:34:28 +00:00
8b85dfc675
At present various drivers etc. access the device's 'seq' member directly. This makes it harder to change the meaning of that member. Change access to go through a function instead. The drivers/i2c/lpc32xx_i2c.c file is left unchanged for now. Signed-off-by: Simon Glass <sjg@chromium.org>
148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Watchdog driver for SP805 on some Layerscape SoC
|
|
*
|
|
* Copyright 2019 NXP
|
|
*/
|
|
|
|
#include <log.h>
|
|
#include <asm/io.h>
|
|
#include <common.h>
|
|
#include <clk.h>
|
|
#include <dm/device.h>
|
|
#include <dm/fdtaddr.h>
|
|
#include <dm/read.h>
|
|
#include <linux/bitops.h>
|
|
#include <watchdog.h>
|
|
#include <wdt.h>
|
|
#include <linux/err.h>
|
|
|
|
#define WDTLOAD 0x000
|
|
#define WDTCONTROL 0x008
|
|
#define WDTINTCLR 0x00C
|
|
#define WDTLOCK 0xC00
|
|
|
|
#define TIME_OUT_MIN_MSECS 1
|
|
#define TIME_OUT_MAX_MSECS 120000
|
|
#define SYS_FSL_WDT_CLK_DIV 16
|
|
#define INT_ENABLE BIT(0)
|
|
#define RESET_ENABLE BIT(1)
|
|
#define DISABLE 0
|
|
#define UNLOCK 0x1ACCE551
|
|
#define LOCK 0x00000001
|
|
#define INT_MASK BIT(0)
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
struct sp805_wdt_priv {
|
|
void __iomem *reg;
|
|
unsigned long clk_rate;
|
|
};
|
|
|
|
static int sp805_wdt_reset(struct udevice *dev)
|
|
{
|
|
struct sp805_wdt_priv *priv = dev_get_priv(dev);
|
|
|
|
writel(UNLOCK, priv->reg + WDTLOCK);
|
|
writel(INT_MASK, priv->reg + WDTINTCLR);
|
|
writel(LOCK, priv->reg + WDTLOCK);
|
|
readl(priv->reg + WDTLOCK);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sp805_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
|
|
{
|
|
u32 load_value;
|
|
u32 load_time;
|
|
struct sp805_wdt_priv *priv = dev_get_priv(dev);
|
|
|
|
load_time = (u32)timeout;
|
|
if (timeout < TIME_OUT_MIN_MSECS)
|
|
load_time = TIME_OUT_MIN_MSECS;
|
|
else if (timeout > TIME_OUT_MAX_MSECS)
|
|
load_time = TIME_OUT_MAX_MSECS;
|
|
/* sp805 runs counter with given value twice, so when the max timeout is
|
|
* set 120s, the gd->bus_clk is less than 1145MHz, the load_value will
|
|
* not overflow.
|
|
*/
|
|
if (gd->bus_clk) {
|
|
load_value = (gd->bus_clk) /
|
|
(2 * 1000 * SYS_FSL_WDT_CLK_DIV) * load_time;
|
|
} else {
|
|
/* platform provide clk */
|
|
load_value = (timeout / 2) * (priv->clk_rate / 1000);
|
|
}
|
|
|
|
writel(UNLOCK, priv->reg + WDTLOCK);
|
|
writel(load_value, priv->reg + WDTLOAD);
|
|
writel(INT_MASK, priv->reg + WDTINTCLR);
|
|
writel(INT_ENABLE | RESET_ENABLE, priv->reg + WDTCONTROL);
|
|
writel(LOCK, priv->reg + WDTLOCK);
|
|
readl(priv->reg + WDTLOCK);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sp805_wdt_stop(struct udevice *dev)
|
|
{
|
|
struct sp805_wdt_priv *priv = dev_get_priv(dev);
|
|
|
|
writel(UNLOCK, priv->reg + WDTLOCK);
|
|
writel(DISABLE, priv->reg + WDTCONTROL);
|
|
writel(LOCK, priv->reg + WDTLOCK);
|
|
readl(priv->reg + WDTLOCK);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sp805_wdt_expire_now(struct udevice *dev, ulong flags)
|
|
{
|
|
sp805_wdt_start(dev, 0, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sp805_wdt_probe(struct udevice *dev)
|
|
{
|
|
debug("%s: Probing wdt%u (sp805-wdt)\n", __func__, dev_seq(dev));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sp805_wdt_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct sp805_wdt_priv *priv = dev_get_priv(dev);
|
|
struct clk clk;
|
|
|
|
priv->reg = (void __iomem *)dev_read_addr(dev);
|
|
if (IS_ERR(priv->reg))
|
|
return PTR_ERR(priv->reg);
|
|
|
|
if (!clk_get_by_index(dev, 0, &clk))
|
|
priv->clk_rate = clk_get_rate(&clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct wdt_ops sp805_wdt_ops = {
|
|
.start = sp805_wdt_start,
|
|
.reset = sp805_wdt_reset,
|
|
.stop = sp805_wdt_stop,
|
|
.expire_now = sp805_wdt_expire_now,
|
|
};
|
|
|
|
static const struct udevice_id sp805_wdt_ids[] = {
|
|
{ .compatible = "arm,sp805-wdt" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(sp805_wdt) = {
|
|
.name = "sp805_wdt",
|
|
.id = UCLASS_WDT,
|
|
.of_match = sp805_wdt_ids,
|
|
.probe = sp805_wdt_probe,
|
|
.priv_auto = sizeof(struct sp805_wdt_priv),
|
|
.of_to_plat = sp805_wdt_of_to_plat,
|
|
.ops = &sp805_wdt_ops,
|
|
};
|