Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 354 insertions, 0 deletions

diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c
new file mode 100644
index 000000000..bb1122909
--- /dev/null
+++ b/drivers/watchdog/it87_wdt.c
@@ -0,0 +1,354 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *	Watchdog Timer Driver
+ *	   for ITE IT87xx Environment Control - Low Pin Count Input / Output
+ *
+ *	(c) Copyright 2007  Oliver Schuster <olivers137@aol.com>
+ *
+ *	Based on softdog.c	by Alan Cox,
+ *		 83977f_wdt.c	by Jose Goncalves,
+ *		 it87.c		by Chris Gauthron, Jean Delvare
+ *
+ *	Data-sheets: Publicly available at the ITE website
+ *		    http://www.ite.com.tw/
+ *
+ *	Support of the watchdog timers, which are available on
+ *	IT8607, IT8620, IT8622, IT8625, IT8628, IT8655, IT8665, IT8686,
+ *	IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726, IT8728,
+ *	IT8772, IT8783 and IT8784.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+#define WATCHDOG_NAME		"IT87 WDT"
+
+/* Defaults for Module Parameter */
+#define DEFAULT_TIMEOUT		60
+#define DEFAULT_TESTMODE	0
+#define DEFAULT_NOWAYOUT	WATCHDOG_NOWAYOUT
+
+/* IO Ports */
+#define REG		0x2e
+#define VAL		0x2f
+
+/* Logical device Numbers LDN */
+#define GPIO		0x07
+
+/* Configuration Registers and Functions */
+#define LDNREG		0x07
+#define CHIPID		0x20
+#define CHIPREV		0x22
+
+/* Chip Id numbers */
+#define NO_DEV_ID	0xffff
+#define IT8607_ID	0x8607
+#define IT8620_ID	0x8620
+#define IT8622_ID	0x8622
+#define IT8625_ID	0x8625
+#define IT8628_ID	0x8628
+#define IT8655_ID	0x8655
+#define IT8665_ID	0x8665
+#define IT8686_ID	0x8686
+#define IT8702_ID	0x8702
+#define IT8705_ID	0x8705
+#define IT8712_ID	0x8712
+#define IT8716_ID	0x8716
+#define IT8718_ID	0x8718
+#define IT8720_ID	0x8720
+#define IT8721_ID	0x8721
+#define IT8726_ID	0x8726	/* the data sheet suggest wrongly 0x8716 */
+#define IT8728_ID	0x8728
+#define IT8772_ID	0x8772
+#define IT8783_ID	0x8783
+#define IT8784_ID	0x8784
+#define IT8786_ID	0x8786
+
+/* GPIO Configuration Registers LDN=0x07 */
+#define WDTCTRL		0x71
+#define WDTCFG		0x72
+#define WDTVALLSB	0x73
+#define WDTVALMSB	0x74
+
+/* GPIO Bits WDTCFG */
+#define WDT_TOV1	0x80
+#define WDT_KRST	0x40
+#define WDT_TOVE	0x20
+#define WDT_PWROK	0x10 /* not in it8721 */
+#define WDT_INT_MASK	0x0f
+
+static unsigned int max_units, chip_type;
+
+static unsigned int timeout = DEFAULT_TIMEOUT;
+static int testmode = DEFAULT_TESTMODE;
+static bool nowayout = DEFAULT_NOWAYOUT;
+
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, default="
+		__MODULE_STRING(DEFAULT_TIMEOUT));
+module_param(testmode, int, 0);
+MODULE_PARM_DESC(testmode, "Watchdog test mode (1 = no reboot), default="
+		__MODULE_STRING(DEFAULT_TESTMODE));
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started, default="
+		__MODULE_STRING(WATCHDOG_NOWAYOUT));
+
+/* Superio Chip */
+
+static inline int superio_enter(void)
+{
+	/*
+	 * Try to reserve REG and REG + 1 for exclusive access.
+	 */
+	if (!request_muxed_region(REG, 2, WATCHDOG_NAME))
+		return -EBUSY;
+
+	outb(0x87, REG);
+	outb(0x01, REG);
+	outb(0x55, REG);
+	outb(0x55, REG);
+	return 0;
+}
+
+static inline void superio_exit(void)
+{
+	outb(0x02, REG);
+	outb(0x02, VAL);
+	release_region(REG, 2);
+}
+
+static inline void superio_select(int ldn)
+{
+	outb(LDNREG, REG);
+	outb(ldn, VAL);
+}
+
+static inline int superio_inb(int reg)
+{
+	outb(reg, REG);
+	return inb(VAL);
+}
+
+static inline void superio_outb(int val, int reg)
+{
+	outb(reg, REG);
+	outb(val, VAL);
+}
+
+static inline int superio_inw(int reg)
+{
+	int val;
+	outb(reg++, REG);
+	val = inb(VAL) << 8;
+	outb(reg, REG);
+	val |= inb(VAL);
+	return val;
+}
+
+/* Internal function, should be called after superio_select(GPIO) */
+static void _wdt_update_timeout(unsigned int t)
+{
+	unsigned char cfg = WDT_KRST;
+
+	if (testmode)
+		cfg = 0;
+
+	if (t <= max_units)
+		cfg |= WDT_TOV1;
+	else
+		t /= 60;
+
+	if (chip_type != IT8721_ID)
+		cfg |= WDT_PWROK;
+
+	superio_outb(cfg, WDTCFG);
+	superio_outb(t, WDTVALLSB);
+	if (max_units > 255)
+		superio_outb(t >> 8, WDTVALMSB);
+}
+
+static int wdt_update_timeout(unsigned int t)
+{
+	int ret;
+
+	ret = superio_enter();
+	if (ret)
+		return ret;
+
+	superio_select(GPIO);
+	_wdt_update_timeout(t);
+	superio_exit();
+
+	return 0;
+}
+
+static int wdt_round_time(int t)
+{
+	t += 59;
+	t -= t % 60;
+	return t;
+}
+
+/* watchdog timer handling */
+
+static int wdt_start(struct watchdog_device *wdd)
+{
+	return wdt_update_timeout(wdd->timeout);
+}
+
+static int wdt_stop(struct watchdog_device *wdd)
+{
+	return wdt_update_timeout(0);
+}
+
+/**
+ *	wdt_set_timeout - set a new timeout value with watchdog ioctl
+ *	@t: timeout value in seconds
+ *
+ *	The hardware device has a 8 or 16 bit watchdog timer (depends on
+ *	chip version) that can be configured to count seconds or minutes.
+ *
+ *	Used within WDIOC_SETTIMEOUT watchdog device ioctl.
+ */
+
+static int wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
+{
+	int ret = 0;
+
+	if (t > max_units)
+		t = wdt_round_time(t);
+
+	wdd->timeout = t;
+
+	if (watchdog_hw_running(wdd))
+		ret = wdt_update_timeout(t);
+
+	return ret;
+}
+
+static const struct watchdog_info ident = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
+	.firmware_version = 1,
+	.identity = WATCHDOG_NAME,
+};
+
+static const struct watchdog_ops wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = wdt_start,
+	.stop = wdt_stop,
+	.set_timeout = wdt_set_timeout,
+};
+
+static struct watchdog_device wdt_dev = {
+	.info = &ident,
+	.ops = &wdt_ops,
+	.min_timeout = 1,
+};
+
+static int __init it87_wdt_init(void)
+{
+	u8  chip_rev;
+	int rc;
+
+	rc = superio_enter();
+	if (rc)
+		return rc;
+
+	chip_type = superio_inw(CHIPID);
+	chip_rev  = superio_inb(CHIPREV) & 0x0f;
+	superio_exit();
+
+	switch (chip_type) {
+	case IT8702_ID:
+		max_units = 255;
+		break;
+	case IT8712_ID:
+		max_units = (chip_rev < 8) ? 255 : 65535;
+		break;
+	case IT8716_ID:
+	case IT8726_ID:
+		max_units = 65535;
+		break;
+	case IT8607_ID:
+	case IT8620_ID:
+	case IT8622_ID:
+	case IT8625_ID:
+	case IT8628_ID:
+	case IT8655_ID:
+	case IT8665_ID:
+	case IT8686_ID:
+	case IT8718_ID:
+	case IT8720_ID:
+	case IT8721_ID:
+	case IT8728_ID:
+	case IT8772_ID:
+	case IT8783_ID:
+	case IT8784_ID:
+	case IT8786_ID:
+		max_units = 65535;
+		break;
+	case IT8705_ID:
+		pr_err("Unsupported Chip found, Chip %04x Revision %02x\n",
+		       chip_type, chip_rev);
+		return -ENODEV;
+	case NO_DEV_ID:
+		pr_err("no device\n");
+		return -ENODEV;
+	default:
+		pr_err("Unknown Chip found, Chip %04x Revision %04x\n",
+		       chip_type, chip_rev);
+		return -ENODEV;
+	}
+
+	rc = superio_enter();
+	if (rc)
+		return rc;
+
+	superio_select(GPIO);
+	superio_outb(WDT_TOV1, WDTCFG);
+	superio_outb(0x00, WDTCTRL);
+	superio_exit();
+
+	if (timeout < 1 || timeout > max_units * 60) {
+		timeout = DEFAULT_TIMEOUT;
+		pr_warn("Timeout value out of range, use default %d sec\n",
+			DEFAULT_TIMEOUT);
+	}
+
+	if (timeout > max_units)
+		timeout = wdt_round_time(timeout);
+
+	wdt_dev.timeout = timeout;
+	wdt_dev.max_timeout = max_units * 60;
+
+	watchdog_stop_on_reboot(&wdt_dev);
+	rc = watchdog_register_device(&wdt_dev);
+	if (rc) {
+		pr_err("Cannot register watchdog device (err=%d)\n", rc);
+		return rc;
+	}
+
+	pr_info("Chip IT%04x revision %d initialized. timeout=%d sec (nowayout=%d testmode=%d)\n",
+		chip_type, chip_rev, timeout, nowayout, testmode);
+
+	return 0;
+}
+
+static void __exit it87_wdt_exit(void)
+{
+	watchdog_unregister_device(&wdt_dev);
+}
+
+module_init(it87_wdt_init);
+module_exit(it87_wdt_exit);
+
+MODULE_AUTHOR("Oliver Schuster");
+MODULE_DESCRIPTION("Hardware Watchdog Device Driver for IT87xx EC-LPC I/O");
+MODULE_LICENSE("GPL");