firmware/br-ext-chip-ingenic/board/t40/kernel/patches/00000-drivers_watchdog_ingenic_wdt.c.patch

diff -drupN a/drivers/watchdog/ingenic_wdt.c b/drivers/watchdog/ingenic_wdt.c
--- a/drivers/watchdog/ingenic_wdt.c	1970-01-01 03:00:00.000000000 +0300
+++ b/drivers/watchdog/ingenic_wdt.c	2022-06-09 05:02:34.000000000 +0300
@@ -0,0 +1,580 @@
+/*
+ *  Copyright (C) 2017, bo.liu <bo.liu@ingenic.com>
+ *  INGENIC Watchdog driver
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under  the terms of the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/clk.h>
+#include <linux/reboot.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/ingenic-tcu.h>
+#include <soc/xburst/reboot.h>
+#include <jz_proc.h>
+#include <soc/base.h>
+
+#define DEFAULT_HEARTBEAT 5
+#define MAX_HEARTBEAT     2048
+
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+		 "Watchdog cannot be stopped once started (default="
+		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static unsigned int heartbeat = DEFAULT_HEARTBEAT;
+module_param(heartbeat, uint, 0);
+MODULE_PARM_DESC(heartbeat,
+		"Watchdog heartbeat period in seconds from 1 to "
+		__MODULE_STRING(MAX_HEARTBEAT) ", default "
+		__MODULE_STRING(DEFAULT_HEARTBEAT));
+
+struct ingenic_wdt_drvdata {
+	struct watchdog_device wdt;
+	struct platform_device *pdev;
+	const struct mfd_cell *cell;
+
+	struct clk *ext_clk;
+	struct notifier_block restart_handler;
+};
+
+static int ingenic_wdt_ping(struct watchdog_device *wdt_dev)
+{
+	ingenic_watchdog_set_count(0);
+	return 0;
+}
+
+static inline int get_clk_div(unsigned int *timeout_value)
+{
+	int clk_div = TCU_PRESCALE_1;
+
+	while (*timeout_value > 0xffff) {
+		if (clk_div == TCU_PRESCALE_1024) {
+			/* Requested timeout too high;
+			 * use highest possible value. */
+			*timeout_value = 0xffff;
+			clk_div = -1;
+			break;
+		}
+		*timeout_value >>= 2;
+		clk_div += 1;
+	}
+
+	return clk_div;
+}
+static void wdt_config(struct ingenic_wdt_drvdata *drvdata,
+					   unsigned int new_timeout)
+{
+	unsigned int rtc_clk_rate;
+	//unsigned int ext_clk_rate;
+	unsigned int timeout_value;
+	unsigned int clk_src;
+	int clk_div = 0;
+
+    rtc_clk_rate = 24000000 / 512;
+	clk_src = TCU_CLKSRC_RTC;
+	//ext_clk_rate = clk_get_rate(drvdata->ext_clk);
+	//timeout_value = ext_clk_rate * new_timeout;
+	timeout_value = rtc_clk_rate * new_timeout;
+	clk_div = get_clk_div(&timeout_value);
+    if(clk_div < 0){
+		printk("Requested timeout too high, use highest possible value\n");
+		clk_div = TCU_PRESCALE_1024;
+		timeout_value = 0xffff;
+	}
+
+    ingenic_watchdog_config((clk_div << 3) | clk_src, timeout_value);
+}
+
+static int ingenic_wdt_set_timeout(struct watchdog_device *wdt_dev,
+								   unsigned int new_timeout)
+{
+	struct ingenic_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+
+	wdt_config(drvdata, new_timeout);
+	wdt_dev->timeout = new_timeout;
+	return 0;
+}
+
+static int ingenic_wdt_start(struct watchdog_device *wdt_dev)
+{
+	struct ingenic_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+
+	drvdata->cell->enable(drvdata->pdev);
+	ingenic_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+	return 0;
+}
+
+static int ingenic_wdt_stop(struct watchdog_device *wdt_dev)
+{
+	struct ingenic_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+	drvdata->cell->disable(drvdata->pdev);
+	return 0;
+}
+
+static const struct watchdog_info ingenic_wdt_info = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+	.identity = "ingenic Watchdog",
+};
+
+static const struct watchdog_ops ingenic_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = ingenic_wdt_start,
+	.stop = ingenic_wdt_stop,
+	.ping = ingenic_wdt_ping,
+	.set_timeout = ingenic_wdt_set_timeout,
+};
+
+static int ingenic_reset_handler(struct notifier_block *this, unsigned long mode,
+		void *cmd)
+{
+	struct ingenic_wdt_drvdata *drvdata = container_of(this,
+			struct ingenic_wdt_drvdata, restart_handler);
+	struct watchdog_device *wdd = &drvdata->wdt;
+
+	if (cmd && !strcmp(cmd, REBOOT_CMD_RECOVERY))
+		ingenic_recovery_sign();
+	else
+		ingenic_reboot_sign();
+
+	if (cmd && !strcmp(cmd, REBOOT_CMD_SOFTBURN))
+		ingenic_softburn_sign();
+
+	mutex_lock(&wdd->lock);
+
+	drvdata->cell->enable(drvdata->pdev);
+
+	ingenic_watchdog_config((3 << 3)|TCU_CLKSRC_RTC, 4);
+	while (1) {
+		mdelay(500);
+		pr_err("wdt reset failed, Never be here\n");
+	}
+	mutex_unlock(&wdd->lock);
+	return NOTIFY_DONE;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id ingenic_wdt_of_matches[] = {
+	{ .compatible = "ingenic,watchdog", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ingenic_wdt_of_matches)
+#endif
+
+static ssize_t watchdog_cmd_set(struct file *file, const char __user *buffer, size_t count, loff_t *f_pos);
+static int watchdog_cmd_open(struct inode *inode, struct file *file);
+static const struct file_operations watchdog_cmd_fops ={
+	.read = seq_read,
+	.open = watchdog_cmd_open,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.write = watchdog_cmd_set,
+};
+
+
+static struct watchdog_device *m_wdt;
+static int ingenic_wdt_probe(struct platform_device *pdev)
+{
+	struct ingenic_wdt_drvdata *drvdata;
+	struct watchdog_device *ingenic_wdt;
+	int ret;
+	struct proc_dir_entry *proc;
+
+	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct ingenic_wdt_drvdata),
+			       GFP_KERNEL);
+	if (!drvdata) {
+		dev_err(&pdev->dev, "Unable to alloacate watchdog device\n");
+		return -ENOMEM;
+	}
+
+	drvdata->cell = mfd_get_cell(pdev);
+	if (!drvdata->cell) {
+		dev_err(&pdev->dev, "Failed to get mfd cell\n");
+		return -ENOMEM;
+	}
+	drvdata->pdev = pdev;
+	if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
+		heartbeat = DEFAULT_HEARTBEAT;
+
+	m_wdt = ingenic_wdt = &drvdata->wdt;
+	ingenic_wdt->info = &ingenic_wdt_info;
+	ingenic_wdt->ops = &ingenic_wdt_ops;
+	ingenic_wdt->timeout = heartbeat;
+	ingenic_wdt->min_timeout = 1;
+	ingenic_wdt->max_timeout = MAX_HEARTBEAT;
+	ingenic_wdt->parent = &pdev->dev;
+	watchdog_set_nowayout(ingenic_wdt, nowayout);
+	watchdog_set_drvdata(ingenic_wdt, drvdata);
+
+	drvdata->ext_clk = devm_clk_get(&pdev->dev, "ext");
+	if (IS_ERR(drvdata->ext_clk)) {
+		dev_err(&pdev->dev, "cannot find EXT clock\n");
+		ret = PTR_ERR(drvdata->ext_clk);
+		goto err_out;
+	}
+
+	ret = watchdog_register_device(&drvdata->wdt);
+	if (ret < 0)
+		goto err_disable_ext_clk;
+
+	platform_set_drvdata(pdev, drvdata);
+
+	drvdata->restart_handler.notifier_call = ingenic_reset_handler;
+	drvdata->restart_handler.priority = WDT_RESET_PROR;
+	ret = register_restart_handler(&drvdata->restart_handler);
+	if (ret)
+		dev_warn(&pdev->dev,
+				 "cannot register restart handler (err=%d)\n", ret);
+
+	/* proc info */
+	proc = jz_proc_mkdir("watchdog");
+	if (!proc) {
+		printk("create mdio info failed!\n");
+	}
+	proc_create_data("reset", S_IRUGO, proc, &watchdog_cmd_fops, NULL);
+
+	return 0;
+
+err_disable_ext_clk:
+	clk_put(drvdata->ext_clk);
+err_out:
+	return ret;
+}
+
+static int ingenic_wdt_remove(struct platform_device *pdev)
+{
+	struct ingenic_wdt_drvdata *drvdata = platform_get_drvdata(pdev);
+
+	ingenic_wdt_stop(&drvdata->wdt);
+	watchdog_unregister_device(&drvdata->wdt);
+	clk_put(drvdata->ext_clk);
+	devm_kfree(&pdev->dev, drvdata);
+	return 0;
+}
+
+static struct platform_driver ingenic_wdt_driver = {
+	.probe = ingenic_wdt_probe,
+	.remove = ingenic_wdt_remove,
+	.driver = {
+		.name = "ingenic,watchdog",
+		.of_match_table = of_match_ptr(ingenic_wdt_of_matches),
+	},
+};
+
+module_platform_driver(ingenic_wdt_driver);
+
+/**********************ingenic utils(deprecated)*****************************************/
+struct wdt_utils {
+	struct watchdog_device *wdt;
+	unsigned msecs;
+
+	unsigned stop;
+	struct task_struct *task;
+	unsigned short count;
+};
+
+static __deprecated int reset_task(void *data) {
+	struct wdt_utils *wdt_utils = data;
+	const struct sched_param param = {
+		.sched_priority = MAX_RT_PRIO-1,
+	};
+	sched_setscheduler(current,SCHED_RR,&param);
+
+	if (test_and_set_bit(WDOG_DEV_OPEN, &wdt_utils->wdt->status)) {
+		pr_warn("watchdog conflict\n");
+		wdt_utils->stop = 1;
+		return 0;
+	}
+
+	mutex_lock(&wdt_utils->wdt->lock);
+
+	ingenic_wdt_set_timeout(wdt_utils->wdt, (wdt_utils->msecs + 1000 - 1)/1000);
+	ingenic_wdt_start(wdt_utils->wdt);
+
+	mutex_unlock(&wdt_utils->wdt->lock);
+
+	while (1) {
+		if(kthread_should_stop()) {
+			clear_bit(WDOG_DEV_OPEN, &wdt_utils->wdt->status);
+			mutex_lock(&wdt_utils->wdt->lock);
+
+			ingenic_wdt_stop(wdt_utils->wdt);
+
+			mutex_unlock(&wdt_utils->wdt->lock);
+			break;
+		}
+
+		mutex_lock(&wdt_utils->wdt->lock);
+
+		ingenic_wdt_ping(wdt_utils->wdt);
+
+		mutex_unlock(&wdt_utils->wdt->lock);
+		msleep(wdt_utils->wdt->timeout / 3);
+	}
+
+	return 0;
+}
+
+static __deprecated ssize_t wdt_time_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct wdt_utils *wdt = dev_get_drvdata(dev);
+	return sprintf(buf, "%d msecs\n", wdt->msecs);
+}
+static __deprecated ssize_t wdt_time_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct wdt_utils *wdt = dev_get_drvdata(dev);
+	unsigned int msecs;
+
+	if(!wdt->stop)
+		return -EBUSY;
+
+	sscanf(buf,"%d\n",&msecs);
+
+	if(msecs < 1000)
+		msecs = 1000;
+	if(msecs > 30000)
+		msecs = 30000;
+
+	wdt->msecs = msecs;
+	return count;
+}
+static __deprecated DEVICE_ATTR_RW(wdt_time);
+
+static __deprecated ssize_t wdt_control_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct wdt_utils *wdt = dev_get_drvdata(dev);
+	return sprintf(buf, "%s\n", wdt->stop?">off<on\n":"off>on<\n");
+}
+
+static __deprecated ssize_t wdt_control_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct wdt_utils *wdt = dev_get_drvdata(dev);
+
+	if(!strncmp(buf,"on",2) && (wdt->stop == 1)) {
+		wdt->task = kthread_run(reset_task, wdt, "reset_task%d",wdt->count++);
+		wdt->stop = 0;
+	} else if(!strncmp(buf,"off",3) && (wdt->stop == 0)) {
+		kthread_stop(wdt->task);
+		wdt->stop = 1;
+	}
+	return count;
+}
+static __deprecated DEVICE_ATTR_RW(wdt_control);
+
+static __deprecated char *reset_command[] = {"wdt", "hibernate","recovery", "burnerboot"};
+static __deprecated ssize_t reset_show(struct device *dev, struct device_attribute *attr,
+						  char *buf)
+{
+	int len = 0, i;
+
+	for(i = 0; i < ARRAY_SIZE(reset_command); i++)
+		len += sprintf(buf + len, "%s\t", reset_command[i]);
+	len += sprintf(buf + len, "\n");
+
+	return len;
+}
+
+static __deprecated ssize_t reset_store(struct device *dev, struct device_attribute *attr,
+						   const char *buf, size_t count)
+{
+	int command_size = 0;
+	int i;
+	char *cmd = NULL;
+
+	if(count == 0)
+		return -EINVAL;
+
+	command_size = ARRAY_SIZE(reset_command);
+	for(i = 0;i < command_size; i++) {
+		if(!strncmp(buf, reset_command[i], strlen(reset_command[i])))
+			break;
+	}
+
+	switch(i) {
+	case 1:
+		reboot_mode = REBOOT_HARD;
+		break;
+	case 2:
+		cmd = "recovery";
+		break;
+	case 3:
+		cmd = "softburn";
+		break;
+	default:
+	case 0:
+		break;
+	}
+	kernel_restart(cmd);
+	return count;
+}
+static __deprecated DEVICE_ATTR_RW(reset);
+
+static __deprecated struct attribute *reset_attrs[] = {
+	&dev_attr_wdt_time.attr,
+	&dev_attr_wdt_control.attr,
+	&dev_attr_reset.attr,
+	NULL
+};
+
+static __deprecated const struct attribute_group attr_group = {
+	.attrs	= reset_attrs,
+};
+
+static __deprecated int wdt_utils_probe(struct platform_device *pdev)
+{
+	struct wdt_utils *wdt;
+	int ret;
+
+	wdt = devm_kzalloc(&pdev->dev, sizeof(struct wdt_utils),GFP_KERNEL);
+	if(!wdt)
+		return -ENOMEM;
+	wdt->wdt = m_wdt;
+	wdt->count = 0;
+	wdt->stop = 1;
+	wdt->msecs = heartbeat * 1000;
+	dev_set_drvdata(&pdev->dev, wdt);
+	ret = sysfs_create_group(&pdev->dev.kobj, &attr_group);
+	if (ret)
+		printk("watchdog utils regist failed\n");
+	return ret;
+}
+
+static __deprecated void wdt_utils_shutdown(struct platform_device *pdev)
+{
+	struct wdt_utils *wdt_utils = dev_get_drvdata(&pdev->dev);
+	ingenic_wdt_stop(wdt_utils->wdt);
+}
+
+static __deprecated int wdt_utils_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct wdt_utils *wdt = dev_get_drvdata(&pdev->dev);
+	if (wdt->stop)
+		return 0;
+	kthread_stop(wdt->task);
+	return 0;
+}
+
+
+static __deprecated int wdt_utils_resume(struct platform_device *pdev)
+{
+	struct wdt_utils *wdt = dev_get_drvdata(&pdev->dev);
+	if(wdt->stop)
+		return 0;
+	wdt->task = kthread_run(reset_task, wdt, "reset_task%d",wdt->count++);
+	return 0;
+}
+
+static __deprecated struct platform_device wdt_utils_pdev = {
+	.name		= "wdt_utils",
+};
+
+static __deprecated struct platform_driver wdt_utils_pdrv = {
+	.probe		= wdt_utils_probe,
+	.shutdown	= wdt_utils_shutdown,
+	.suspend	= wdt_utils_suspend,
+	.resume		= wdt_utils_resume,
+	.driver		= {
+		.name	= "wdt_utils",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static __deprecated int __init init_reset(void)
+{
+	platform_driver_register(&wdt_utils_pdrv);
+	platform_device_register(&wdt_utils_pdev);
+	return 0;
+}
+device_initcall_sync(init_reset);
+MODULE_AUTHOR("bo.liu <bo.liu@ingenic.com>");
+MODULE_DESCRIPTION("ingenic Watchdog Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ingenic-wdt");
+
+
+/* cmd */
+#define WATCHDOG_CMD_BUF_SIZE 100
+static uint8_t watchdog_cmd_buf[100];
+static int watchdog_cmd_show(struct seq_file *m, void *v)
+{
+	int len = 0;
+	len += seq_printf(m ,"%s\n", watchdog_cmd_buf);
+	return len;
+}
+
+static ssize_t watchdog_cmd_set(struct file *file, const char __user *buffer, size_t count, loff_t *f_pos)
+{
+    int cmd_value = 0;
+    unsigned int reg04 = 0,reglc = 0;
+
+	char *buf = kzalloc((count+1), GFP_KERNEL);
+	if(!buf)
+		return -ENOMEM;
+	if(copy_from_user(buf, buffer, count))
+	{
+		kfree(buf);
+		return EFAULT;
+	}
+	cmd_value = simple_strtoull(buf, NULL, 0);
+
+	mdelay(1000);
+	if(1 == cmd_value) {
+		reg04 = inl(TCU_IOBASE + 0x04);
+		if(reg04 & 0x1) {
+			outl(0 << 0, TCU_IOBASE + 0x4);
+		}
+
+		outl(0x1a, TCU_IOBASE + 0xc);
+
+		reglc = inl(TCU_IOBASE + 0x1c);
+		if(reglc & 0x10000) {
+			outl(1 << 16, TCU_IOBASE + 0x3c);
+			outl(1 << 16, TCU_IOBASE + 0x2c);
+		}
+		outl(0x0000, TCU_IOBASE + 0x0);
+		outl(0x0000, TCU_IOBASE + 0x8);
+
+		reg04 = inl(TCU_IOBASE + 0x04);
+		if(!(reg04 & 0x1)) {
+			outl(1 << 0, TCU_IOBASE + 0x4);
+		}
+		printk("watchdog reboot system!!!\n");
+	}
+
+	kfree(buf);
+	return count;
+}
+static int watchdog_cmd_open(struct inode *inode, struct file *file)
+{
+	return single_open_size(file, watchdog_cmd_show, PDE_DATA(inode),8192);
+}