[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/drivers/watchdog/da9063_wdt.c b/src/kernel/linux/v4.19/drivers/watchdog/da9063_wdt.c
new file mode 100644
index 0000000..384dca1
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/watchdog/da9063_wdt.c
@@ -0,0 +1,239 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Watchdog driver for DA9063 PMICs.
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/mfd/da9063/registers.h>
+#include <linux/mfd/da9063/core.h>
+#include <linux/regmap.h>
+
+/*
+ * Watchdog selector to timeout in seconds.
+ * 0: WDT disabled;
+ * others: timeout = 2048 ms * 2^(TWDSCALE-1).
+ */
+static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
+#define DA9063_TWDSCALE_DISABLE 0
+#define DA9063_TWDSCALE_MIN 1
+#define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1)
+#define DA9063_WDT_MIN_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MIN]
+#define DA9063_WDT_MAX_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MAX]
+#define DA9063_WDG_TIMEOUT wdt_timeout[3]
+#define DA9063_RESET_PROTECTION_MS 256
+
+static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
+{
+ unsigned int i;
+
+ for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) {
+ if (wdt_timeout[i] >= secs)
+ return i;
+ }
+
+ return DA9063_TWDSCALE_MAX;
+}
+
+/*
+ * Return 0 if watchdog is disabled, else non zero.
+ */
+static unsigned int da9063_wdt_is_running(struct da9063 *da9063)
+{
+ unsigned int val;
+
+ regmap_read(da9063->regmap, DA9063_REG_CONTROL_D, &val);
+
+ return val & DA9063_TWDSCALE_MASK;
+}
+
+static int da9063_wdt_disable_timer(struct da9063 *da9063)
+{
+ return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
+ DA9063_TWDSCALE_MASK,
+ DA9063_TWDSCALE_DISABLE);
+}
+
+static int
+da9063_wdt_update_timeout(struct da9063 *da9063, unsigned int timeout)
+{
+ unsigned int regval;
+ int ret;
+
+ /*
+ * The watchdog triggers a reboot if a timeout value is already
+ * programmed because the timeout value combines two functions
+ * in one: indicating the counter limit and starting the watchdog.
+ * The watchdog must be disabled to be able to change the timeout
+ * value if the watchdog is already running. Then we can set the
+ * new timeout value which enables the watchdog again.
+ */
+ ret = da9063_wdt_disable_timer(da9063);
+ if (ret)
+ return ret;
+
+ usleep_range(150, 300);
+ regval = da9063_wdt_timeout_to_sel(timeout);
+
+ return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
+ DA9063_TWDSCALE_MASK, regval);
+}
+
+static int da9063_wdt_start(struct watchdog_device *wdd)
+{
+ struct da9063 *da9063 = watchdog_get_drvdata(wdd);
+ int ret;
+
+ ret = da9063_wdt_update_timeout(da9063, wdd->timeout);
+ if (ret)
+ dev_err(da9063->dev, "Watchdog failed to start (err = %d)\n",
+ ret);
+
+ return ret;
+}
+
+static int da9063_wdt_stop(struct watchdog_device *wdd)
+{
+ struct da9063 *da9063 = watchdog_get_drvdata(wdd);
+ int ret;
+
+ ret = da9063_wdt_disable_timer(da9063);
+ if (ret)
+ dev_alert(da9063->dev, "Watchdog failed to stop (err = %d)\n",
+ ret);
+
+ return ret;
+}
+
+static int da9063_wdt_ping(struct watchdog_device *wdd)
+{
+ struct da9063 *da9063 = watchdog_get_drvdata(wdd);
+ int ret;
+
+ ret = regmap_write(da9063->regmap, DA9063_REG_CONTROL_F,
+ DA9063_WATCHDOG);
+ if (ret)
+ dev_alert(da9063->dev, "Failed to ping the watchdog (err = %d)\n",
+ ret);
+
+ return ret;
+}
+
+static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ struct da9063 *da9063 = watchdog_get_drvdata(wdd);
+ int ret = 0;
+
+ /*
+ * There are two cases when a set_timeout() will be called:
+ * 1. The watchdog is off and someone wants to set the timeout for the
+ * further use.
+ * 2. The watchdog is already running and a new timeout value should be
+ * set.
+ *
+ * The watchdog can't store a timeout value not equal zero without
+ * enabling the watchdog, so the timeout must be buffered by the driver.
+ */
+ if (watchdog_active(wdd))
+ ret = da9063_wdt_update_timeout(da9063, timeout);
+
+ if (ret)
+ dev_err(da9063->dev, "Failed to set watchdog timeout (err = %d)\n",
+ ret);
+ else
+ wdd->timeout = wdt_timeout[da9063_wdt_timeout_to_sel(timeout)];
+
+ return ret;
+}
+
+static int da9063_wdt_restart(struct watchdog_device *wdd, unsigned long action,
+ void *data)
+{
+ struct da9063 *da9063 = watchdog_get_drvdata(wdd);
+ int ret;
+
+ ret = regmap_write(da9063->regmap, DA9063_REG_CONTROL_F,
+ DA9063_SHUTDOWN);
+ if (ret)
+ dev_alert(da9063->dev, "Failed to shutdown (err = %d)\n",
+ ret);
+
+ return ret;
+}
+
+static const struct watchdog_info da9063_watchdog_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+ .identity = "DA9063 Watchdog",
+};
+
+static const struct watchdog_ops da9063_watchdog_ops = {
+ .owner = THIS_MODULE,
+ .start = da9063_wdt_start,
+ .stop = da9063_wdt_stop,
+ .ping = da9063_wdt_ping,
+ .set_timeout = da9063_wdt_set_timeout,
+ .restart = da9063_wdt_restart,
+};
+
+static int da9063_wdt_probe(struct platform_device *pdev)
+{
+ struct da9063 *da9063;
+ struct watchdog_device *wdd;
+
+ if (!pdev->dev.parent)
+ return -EINVAL;
+
+ da9063 = dev_get_drvdata(pdev->dev.parent);
+ if (!da9063)
+ return -EINVAL;
+
+ wdd = devm_kzalloc(&pdev->dev, sizeof(*wdd), GFP_KERNEL);
+ if (!wdd)
+ return -ENOMEM;
+
+ wdd->info = &da9063_watchdog_info;
+ wdd->ops = &da9063_watchdog_ops;
+ wdd->min_timeout = DA9063_WDT_MIN_TIMEOUT;
+ wdd->max_timeout = DA9063_WDT_MAX_TIMEOUT;
+ wdd->min_hw_heartbeat_ms = DA9063_RESET_PROTECTION_MS;
+ wdd->timeout = DA9063_WDG_TIMEOUT;
+ wdd->parent = &pdev->dev;
+
+ wdd->status = WATCHDOG_NOWAYOUT_INIT_STATUS;
+
+ watchdog_set_restart_priority(wdd, 128);
+
+ watchdog_set_drvdata(wdd, da9063);
+
+ /* Change the timeout to the default value if the watchdog is running */
+ if (da9063_wdt_is_running(da9063)) {
+ da9063_wdt_update_timeout(da9063, DA9063_WDG_TIMEOUT);
+ set_bit(WDOG_HW_RUNNING, &wdd->status);
+ }
+
+ return devm_watchdog_register_device(&pdev->dev, wdd);
+}
+
+static struct platform_driver da9063_wdt_driver = {
+ .probe = da9063_wdt_probe,
+ .driver = {
+ .name = DA9063_DRVNAME_WATCHDOG,
+ },
+};
+module_platform_driver(da9063_wdt_driver);
+
+MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>");
+MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG);