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watchdog: mtk_wdt: mt8183: Add reset controller

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Add reset controller API in watchdog driver.
Besides watchdog, MTK toprgu module alsa provide sub-system (eg, audio,
camera, codec and connectivity) software reset functionality.

Signed-off-by: yong.liang <yong.liang@mediatek.com>
Signed-off-by: Jiaxin Yu <jiaxin.yu@mediatek.com>
Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/20200115085828.27791-4-yong.liang@mediatek.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
yong.liang 2020-01-15 16:58:27 +08:00 committed by Wim Van Sebroeck
parent fe42cc30a9
commit c254e10308
1 changed files with 98 additions and 1 deletions
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99
drivers/watchdog/mtk_wdt.c
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@ -9,6 +9,8 @@
* Based on sunxi_wdt.c
*/
#include <dt-bindings/reset-controller/mt8183-resets.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
@ -16,10 +18,11 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/delay.h>
#define WDT_MAX_TIMEOUT 31
#define WDT_MIN_TIMEOUT 1
@ -44,6 +47,9 @@
#define WDT_SWRST 0x14
#define WDT_SWRST_KEY 0x1209
#define WDT_SWSYSRST 0x18U
#define WDT_SWSYS_RST_KEY 0x88000000
#define DRV_NAME "mtk-wdt"
#define DRV_VERSION "1.0"
@ -53,8 +59,90 @@ static unsigned int timeout;
struct mtk_wdt_dev {
struct watchdog_device wdt_dev;
void __iomem *wdt_base;
spinlock_t lock; /* protects WDT_SWSYSRST reg */
struct reset_controller_dev rcdev;
};
struct mtk_wdt_data {
int toprgu_sw_rst_num;
};
static const struct mtk_wdt_data mt8183_data = {
.toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
};
static int toprgu_reset_update(struct reset_controller_dev *rcdev,
unsigned long id, bool assert)
{
unsigned int tmp;
unsigned long flags;
struct mtk_wdt_dev *data =
container_of(rcdev, struct mtk_wdt_dev, rcdev);
spin_lock_irqsave(&data->lock, flags);
tmp = readl(data->wdt_base + WDT_SWSYSRST);
if (assert)
tmp |= BIT(id);
else
tmp &= ~BIT(id);
tmp |= WDT_SWSYS_RST_KEY;
writel(tmp, data->wdt_base + WDT_SWSYSRST);
spin_unlock_irqrestore(&data->lock, flags);
return 0;
}
static int toprgu_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return toprgu_reset_update(rcdev, id, true);
}
static int toprgu_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return toprgu_reset_update(rcdev, id, false);
}
static int toprgu_reset(struct reset_controller_dev *rcdev,
unsigned long id)
{
int ret;
ret = toprgu_reset_assert(rcdev, id);
if (ret)
return ret;
return toprgu_reset_deassert(rcdev, id);
}
static const struct reset_control_ops toprgu_reset_ops = {
.assert = toprgu_reset_assert,
.deassert = toprgu_reset_deassert,
.reset = toprgu_reset,
};
static int toprgu_register_reset_controller(struct platform_device *pdev,
int rst_num)
{
int ret;
struct mtk_wdt_dev *mtk_wdt = platform_get_drvdata(pdev);
spin_lock_init(&mtk_wdt->lock);
mtk_wdt->rcdev.owner = THIS_MODULE;
mtk_wdt->rcdev.nr_resets = rst_num;
mtk_wdt->rcdev.ops = &toprgu_reset_ops;
mtk_wdt->rcdev.of_node = pdev->dev.of_node;
ret = devm_reset_controller_register(&pdev->dev, &mtk_wdt->rcdev);
if (ret != 0)
dev_err(&pdev->dev,
"couldn't register wdt reset controller: %d\n", ret);
return ret;
}
static int mtk_wdt_restart(struct watchdog_device *wdt_dev,
unsigned long action, void *data)
{
@ -155,6 +243,7 @@ static int mtk_wdt_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_wdt_dev *mtk_wdt;
const struct mtk_wdt_data *wdt_data;
int err;
mtk_wdt = devm_kzalloc(dev, sizeof(*mtk_wdt), GFP_KERNEL);
@ -190,6 +279,13 @@ static int mtk_wdt_probe(struct platform_device *pdev)
dev_info(dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)\n",
mtk_wdt->wdt_dev.timeout, nowayout);
wdt_data = of_device_get_match_data(dev);
if (wdt_data) {
err = toprgu_register_reset_controller(pdev,
wdt_data->toprgu_sw_rst_num);
if (err)
return err;
}
return 0;
}
@ -219,6 +315,7 @@ static int mtk_wdt_resume(struct device *dev)
static const struct of_device_id mtk_wdt_dt_ids[] = {
{ .compatible = "mediatek,mt6589-wdt" },
{ .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids);