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linux/drivers/watchdog/it87_wdt.c
James Hilliard 4343907638 watchdog: it87_wdt: add PWRGD enable quirk for Qotom QCML04 
For the watchdog timer to work properly on the QCML04 board we need to
set PWRGD enable in the Environment Controller Configuration Registers
Special Configuration Register 1 when it is not already set, this may
be the case when the watchdog is not enabled from within the BIOS.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20241025063441.3494837-1-james.hilliard1@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2024-11-05 10:04:40 +01:00

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// 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, IT8613, IT8620, IT8622, IT8625, IT8628, IT8655, IT8659,
* IT8665, IT8686, IT8702, IT8712, IT8716, IT8718, IT8720, IT8721,
* IT8726, IT8728, IT8772, IT8783, IT8784 and IT8786.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bits.h>
#include <linux/dmi.h>
#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 EC 0x04
#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 IT8613_ID 0x8613
#define IT8620_ID 0x8620
#define IT8622_ID 0x8622
#define IT8625_ID 0x8625
#define IT8628_ID 0x8628
#define IT8655_ID 0x8655
#define IT8659_ID 0x8659
#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
/* Environment Controller Configuration Registers LDN=0x04 */
#define SCR1 0xfa
/* Environment Controller Bits SCR1 */
#define WDT_PWRGD 0x20
/* 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
* @wdd: pointer to the watchdog_device structure
* @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.
*
* Return: 0 if the timeout was set successfully, or a negative error code on
* failure.
*/
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;
}
enum {
IT87_WDT_OUTPUT_THROUGH_PWRGD = BIT(0),
};
static const struct dmi_system_id it87_quirks[] = {
{
/* Qotom Q30900P (IT8786) */
.matches = {
DMI_EXACT_MATCH(DMI_BOARD_NAME, "QCML04"),
},
.driver_data = (void *)IT87_WDT_OUTPUT_THROUGH_PWRGD,
},
{}
};
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)
{
const struct dmi_system_id *dmi_id;
u8 chip_rev;
u8 ctrl;
int quirks = 0;
int rc;
rc = superio_enter();
if (rc)
return rc;
chip_type = superio_inw(CHIPID);
chip_rev = superio_inb(CHIPREV) & 0x0f;
superio_exit();
dmi_id = dmi_first_match(it87_quirks);
if (dmi_id)
quirks = (long)dmi_id->driver_data;
switch (chip_type) {
case IT8702_ID:
max_units = 255;
break;
case IT8712_ID:
max_units = (chip_rev < 8) ? 255 : 65535;
break;
case IT8607_ID:
case IT8613_ID:
case IT8620_ID:
case IT8622_ID:
case IT8625_ID:
case IT8628_ID:
case IT8655_ID:
case IT8659_ID:
case IT8665_ID:
case IT8686_ID:
case IT8716_ID:
case IT8718_ID:
case IT8720_ID:
case IT8721_ID:
case IT8726_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);
switch (chip_type) {
case IT8784_ID:
case IT8786_ID:
ctrl = superio_inb(WDTCTRL);
ctrl &= 0x08;
superio_outb(ctrl, WDTCTRL);
break;
default:
superio_outb(0x00, WDTCTRL);
}
if (quirks & IT87_WDT_OUTPUT_THROUGH_PWRGD) {
superio_select(EC);
ctrl = superio_inb(SCR1);
if (!(ctrl & WDT_PWRGD)) {
ctrl |= WDT_PWRGD;
superio_outb(ctrl, SCR1);
}
}
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)
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");
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