mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-04 14:10:46 +00:00
watchdog: zx2967: add watchdog controller driver for ZTE's zx2967 family
This patch adds watchdog controller driver for ZTE's zx2967 family. Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Baoyou Xie
Guenter Roeck
parent
df823c19e5
commit
8ce6796dab
@ -725,6 +725,16 @@ config ASPEED_WATCHDOG
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called aspeed_wdt.
|
||||
|
||||
config ZX2967_WATCHDOG
|
||||
tristate "ZTE zx2967 SoCs watchdog support"
|
||||
depends on ARCH_ZX
|
||||
select WATCHDOG_CORE
|
||||
help
|
||||
Say Y here to include support for the watchdog timer
|
||||
in ZTE zx2967 SoCs.
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called zx2967_wdt.
|
||||
|
||||
# AVR32 Architecture
|
||||
|
||||
config AT32AP700X_WDT
|
||||
|
||||
@ -83,6 +83,7 @@ obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o
|
||||
obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o
|
||||
obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o
|
||||
obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o
|
||||
obj-$(CONFIG_ZX2967_WATCHDOG) += zx2967_wdt.o
|
||||
|
||||
# AVR32 Architecture
|
||||
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
|
||||
|
||||
291
drivers/watchdog/zx2967_wdt.c
Normal file
291
drivers/watchdog/zx2967_wdt.c
Normal file
@ -0,0 +1,291 @@
|
||||
/*
|
||||
* watchdog driver for ZTE's zx2967 family
|
||||
*
|
||||
* Copyright (C) 2017 ZTE Ltd.
|
||||
*
|
||||
* Author: Baoyou Xie <baoyou.xie@linaro.org>
|
||||
*
|
||||
* License terms: GNU General Public License (GPL) version 2
|
||||
*/
|
||||
|
||||
#include <linux/clk.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/mfd/syscon.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of_address.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/regmap.h>
|
||||
#include <linux/reset.h>
|
||||
#include <linux/watchdog.h>
|
||||
|
||||
#define ZX2967_WDT_CFG_REG 0x4
|
||||
#define ZX2967_WDT_LOAD_REG 0x8
|
||||
#define ZX2967_WDT_REFRESH_REG 0x18
|
||||
#define ZX2967_WDT_START_REG 0x1c
|
||||
|
||||
#define ZX2967_WDT_REFRESH_MASK GENMASK(5, 0)
|
||||
|
||||
#define ZX2967_WDT_CFG_DIV(n) ((((n) & 0xff) - 1) << 8)
|
||||
#define ZX2967_WDT_START_EN 0x1
|
||||
|
||||
/*
|
||||
* Hardware magic number.
|
||||
* When watchdog reg is written, the lowest 16 bits are valid, but
|
||||
* the highest 16 bits should be always this number.
|
||||
*/
|
||||
#define ZX2967_WDT_WRITEKEY (0x1234 << 16)
|
||||
#define ZX2967_WDT_VAL_MASK GENMASK(15, 0)
|
||||
|
||||
#define ZX2967_WDT_DIV_DEFAULT 16
|
||||
#define ZX2967_WDT_DEFAULT_TIMEOUT 32
|
||||
#define ZX2967_WDT_MIN_TIMEOUT 1
|
||||
#define ZX2967_WDT_MAX_TIMEOUT 524
|
||||
#define ZX2967_WDT_MAX_COUNT 0xffff
|
||||
|
||||
#define ZX2967_WDT_CLK_FREQ 0x8000
|
||||
|
||||
#define ZX2967_WDT_FLAG_REBOOT_MON BIT(0)
|
||||
|
||||
struct zx2967_wdt {
|
||||
struct watchdog_device wdt_device;
|
||||
void __iomem *reg_base;
|
||||
struct clk *clock;
|
||||
};
|
||||
|
||||
static inline u32 zx2967_wdt_readl(struct zx2967_wdt *wdt, u16 reg)
|
||||
{
|
||||
return readl_relaxed(wdt->reg_base + reg);
|
||||
}
|
||||
|
||||
static inline void zx2967_wdt_writel(struct zx2967_wdt *wdt, u16 reg, u32 val)
|
||||
{
|
||||
writel_relaxed(val | ZX2967_WDT_WRITEKEY, wdt->reg_base + reg);
|
||||
}
|
||||
|
||||
static void zx2967_wdt_refresh(struct zx2967_wdt *wdt)
|
||||
{
|
||||
u32 val;
|
||||
|
||||
val = zx2967_wdt_readl(wdt, ZX2967_WDT_REFRESH_REG);
|
||||
/*
|
||||
* Bit 4-5, 1 and 2: refresh config info
|
||||
* Bit 2-3, 1 and 2: refresh counter
|
||||
* Bit 0-1, 1 and 2: refresh int-value
|
||||
* we shift each group value between 1 and 2 to refresh all data.
|
||||
*/
|
||||
val ^= ZX2967_WDT_REFRESH_MASK;
|
||||
zx2967_wdt_writel(wdt, ZX2967_WDT_REFRESH_REG,
|
||||
val & ZX2967_WDT_VAL_MASK);
|
||||
}
|
||||
|
||||
static int
|
||||
zx2967_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout)
|
||||
{
|
||||
struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd);
|
||||
unsigned int divisor = ZX2967_WDT_DIV_DEFAULT;
|
||||
u32 count;
|
||||
|
||||
count = timeout * ZX2967_WDT_CLK_FREQ;
|
||||
if (count > divisor * ZX2967_WDT_MAX_COUNT)
|
||||
divisor = DIV_ROUND_UP(count, ZX2967_WDT_MAX_COUNT);
|
||||
count = DIV_ROUND_UP(count, divisor);
|
||||
zx2967_wdt_writel(wdt, ZX2967_WDT_CFG_REG,
|
||||
ZX2967_WDT_CFG_DIV(divisor) & ZX2967_WDT_VAL_MASK);
|
||||
zx2967_wdt_writel(wdt, ZX2967_WDT_LOAD_REG,
|
||||
count & ZX2967_WDT_VAL_MASK);
|
||||
zx2967_wdt_refresh(wdt);
|
||||
wdd->timeout = (count * divisor) / ZX2967_WDT_CLK_FREQ;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __zx2967_wdt_start(struct zx2967_wdt *wdt)
|
||||
{
|
||||
u32 val;
|
||||
|
||||
val = zx2967_wdt_readl(wdt, ZX2967_WDT_START_REG);
|
||||
val |= ZX2967_WDT_START_EN;
|
||||
zx2967_wdt_writel(wdt, ZX2967_WDT_START_REG,
|
||||
val & ZX2967_WDT_VAL_MASK);
|
||||
}
|
||||
|
||||
static void __zx2967_wdt_stop(struct zx2967_wdt *wdt)
|
||||
{
|
||||
u32 val;
|
||||
|
||||
val = zx2967_wdt_readl(wdt, ZX2967_WDT_START_REG);
|
||||
val &= ~ZX2967_WDT_START_EN;
|
||||
zx2967_wdt_writel(wdt, ZX2967_WDT_START_REG,
|
||||
val & ZX2967_WDT_VAL_MASK);
|
||||
}
|
||||
|
||||
static int zx2967_wdt_start(struct watchdog_device *wdd)
|
||||
{
|
||||
struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd);
|
||||
|
||||
zx2967_wdt_set_timeout(wdd, wdd->timeout);
|
||||
__zx2967_wdt_start(wdt);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int zx2967_wdt_stop(struct watchdog_device *wdd)
|
||||
{
|
||||
struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd);
|
||||
|
||||
__zx2967_wdt_stop(wdt);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int zx2967_wdt_keepalive(struct watchdog_device *wdd)
|
||||
{
|
||||
struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd);
|
||||
|
||||
zx2967_wdt_refresh(wdt);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define ZX2967_WDT_OPTIONS \
|
||||
(WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)
|
||||
static const struct watchdog_info zx2967_wdt_ident = {
|
||||
.options = ZX2967_WDT_OPTIONS,
|
||||
.identity = "zx2967 watchdog",
|
||||
};
|
||||
|
||||
static struct watchdog_ops zx2967_wdt_ops = {
|
||||
.owner = THIS_MODULE,
|
||||
.start = zx2967_wdt_start,
|
||||
.stop = zx2967_wdt_stop,
|
||||
.ping = zx2967_wdt_keepalive,
|
||||
.set_timeout = zx2967_wdt_set_timeout,
|
||||
};
|
||||
|
||||
static void zx2967_wdt_reset_sysctrl(struct device *dev)
|
||||
{
|
||||
int ret;
|
||||
void __iomem *regmap;
|
||||
unsigned int offset, mask, config;
|
||||
struct of_phandle_args out_args;
|
||||
|
||||
ret = of_parse_phandle_with_fixed_args(dev->of_node,
|
||||
"zte,wdt-reset-sysctrl", 3, 0, &out_args);
|
||||
if (ret)
|
||||
return;
|
||||
|
||||
offset = out_args.args[0];
|
||||
config = out_args.args[1];
|
||||
mask = out_args.args[2];
|
||||
|
||||
regmap = syscon_node_to_regmap(out_args.np);
|
||||
if (IS_ERR(regmap)) {
|
||||
of_node_put(out_args.np);
|
||||
return;
|
||||
}
|
||||
|
||||
regmap_update_bits(regmap, offset, mask, config);
|
||||
of_node_put(out_args.np);
|
||||
}
|
||||
|
||||
static int zx2967_wdt_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
struct zx2967_wdt *wdt;
|
||||
struct resource *base;
|
||||
int ret;
|
||||
struct reset_control *rstc;
|
||||
|
||||
wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
|
||||
if (!wdt)
|
||||
return -ENOMEM;
|
||||
|
||||
platform_set_drvdata(pdev, wdt);
|
||||
|
||||
wdt->wdt_device.info = &zx2967_wdt_ident;
|
||||
wdt->wdt_device.ops = &zx2967_wdt_ops;
|
||||
wdt->wdt_device.timeout = ZX2967_WDT_DEFAULT_TIMEOUT;
|
||||
wdt->wdt_device.max_timeout = ZX2967_WDT_MAX_TIMEOUT;
|
||||
wdt->wdt_device.min_timeout = ZX2967_WDT_MIN_TIMEOUT;
|
||||
wdt->wdt_device.parent = &pdev->dev;
|
||||
|
||||
base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
wdt->reg_base = devm_ioremap_resource(dev, base);
|
||||
if (IS_ERR(wdt->reg_base)) {
|
||||
dev_err(dev, "ioremap failed\n");
|
||||
return PTR_ERR(wdt->reg_base);
|
||||
}
|
||||
|
||||
zx2967_wdt_reset_sysctrl(dev);
|
||||
|
||||
wdt->clock = devm_clk_get(dev, NULL);
|
||||
if (IS_ERR(wdt->clock)) {
|
||||
dev_err(dev, "failed to find watchdog clock source\n");
|
||||
return PTR_ERR(wdt->clock);
|
||||
}
|
||||
|
||||
ret = clk_prepare_enable(wdt->clock);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "failed to enable clock\n");
|
||||
return ret;
|
||||
}
|
||||
clk_set_rate(wdt->clock, ZX2967_WDT_CLK_FREQ);
|
||||
|
||||
rstc = devm_reset_control_get(dev, NULL);
|
||||
if (IS_ERR(rstc)) {
|
||||
dev_err(dev, "failed to get rstc");
|
||||
ret = PTR_ERR(rstc);
|
||||
goto err;
|
||||
}
|
||||
|
||||
reset_control_assert(rstc);
|
||||
reset_control_deassert(rstc);
|
||||
|
||||
watchdog_set_drvdata(&wdt->wdt_device, wdt);
|
||||
watchdog_init_timeout(&wdt->wdt_device,
|
||||
ZX2967_WDT_DEFAULT_TIMEOUT, dev);
|
||||
watchdog_set_nowayout(&wdt->wdt_device, WATCHDOG_NOWAYOUT);
|
||||
|
||||
ret = watchdog_register_device(&wdt->wdt_device);
|
||||
if (ret)
|
||||
goto err;
|
||||
|
||||
dev_info(dev, "watchdog enabled (timeout=%d sec, nowayout=%d)",
|
||||
wdt->wdt_device.timeout, WATCHDOG_NOWAYOUT);
|
||||
|
||||
return 0;
|
||||
|
||||
err:
|
||||
clk_disable_unprepare(wdt->clock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int zx2967_wdt_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct zx2967_wdt *wdt = platform_get_drvdata(pdev);
|
||||
|
||||
watchdog_unregister_device(&wdt->wdt_device);
|
||||
clk_disable_unprepare(wdt->clock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id zx2967_wdt_match[] = {
|
||||
{ .compatible = "zte,zx296718-wdt", },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, zx2967_wdt_match);
|
||||
|
||||
static struct platform_driver zx2967_wdt_driver = {
|
||||
.probe = zx2967_wdt_probe,
|
||||
.remove = zx2967_wdt_remove,
|
||||
.driver = {
|
||||
.name = "zx2967-wdt",
|
||||
.of_match_table = of_match_ptr(zx2967_wdt_match),
|
||||
},
|
||||
};
|
||||
module_platform_driver(zx2967_wdt_driver);
|
||||
|
||||
MODULE_AUTHOR("Baoyou Xie <baoyou.xie@linaro.org>");
|
||||
MODULE_DESCRIPTION("ZTE zx2967 Watchdog Device Driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user