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linux-sg2042/drivers/watchdog/f71808e_wdt.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/***************************************************************************
* Copyright (C) 2006 by Hans Edgington <hans@edgington.nl> *
* Copyright (C) 2007-2009 Hans de Goede <hdegoede@redhat.com> *
* Copyright (C) 2010 Giel van Schijndel <me@mortis.eu> *
* *
***************************************************************************/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
#define DRVNAME "f71808e_wdt"
#define SIO_F71808FG_LD_WDT 0x07 /* Watchdog timer logical device */
#define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */
#define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */
#define SIO_REG_LDSEL 0x07 /* Logical device select */
#define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */
#define SIO_REG_DEVREV 0x22 /* Device revision */
#define SIO_REG_MANID 0x23 /* Fintek ID (2 bytes) */
#define SIO_REG_CLOCK_SEL 0x26 /* Clock select */
#define SIO_REG_ROM_ADDR_SEL 0x27 /* ROM address select */
#define SIO_F81866_REG_PORT_SEL 0x27 /* F81866 Multi-Function Register */
#define SIO_REG_TSI_LEVEL_SEL 0x28 /* TSI Level select */
#define SIO_REG_MFUNCT1 0x29 /* Multi function select 1 */
#define SIO_REG_MFUNCT2 0x2a /* Multi function select 2 */
#define SIO_REG_MFUNCT3 0x2b /* Multi function select 3 */
#define SIO_F81866_REG_GPIO1 0x2c /* F81866 GPIO1 Enable Register */
#define SIO_REG_ENABLE 0x30 /* Logical device enable */
#define SIO_REG_ADDR 0x60 /* Logical device address (2 bytes) */
#define SIO_FINTEK_ID 0x1934 /* Manufacturers ID */
#define SIO_F71808_ID 0x0901 /* Chipset ID */
#define SIO_F71858_ID 0x0507 /* Chipset ID */
#define SIO_F71862_ID 0x0601 /* Chipset ID */
#define SIO_F71868_ID 0x1106 /* Chipset ID */
#define SIO_F71869_ID 0x0814 /* Chipset ID */
#define SIO_F71869A_ID 0x1007 /* Chipset ID */
#define SIO_F71882_ID 0x0541 /* Chipset ID */
#define SIO_F71889_ID 0x0723 /* Chipset ID */
#define SIO_F81803_ID 0x1210 /* Chipset ID */
#define SIO_F81865_ID 0x0704 /* Chipset ID */
#define SIO_F81866_ID 0x1010 /* Chipset ID */
#define SIO_F81966_ID 0x1502 /* F81804 chipset ID, same for f81966 */
#define F71808FG_REG_WDO_CONF 0xf0
#define F71808FG_REG_WDT_CONF 0xf5
#define F71808FG_REG_WD_TIME 0xf6
#define F71808FG_FLAG_WDOUT_EN 7
#define F71808FG_FLAG_WDTMOUT_STS 6
#define F71808FG_FLAG_WD_EN 5
#define F71808FG_FLAG_WD_PULSE 4
#define F71808FG_FLAG_WD_UNIT 3
#define F81865_REG_WDO_CONF 0xfa
#define F81865_FLAG_WDOUT_EN 0
/* Default values */
#define WATCHDOG_TIMEOUT 60 /* 1 minute default timeout */
#define WATCHDOG_MAX_TIMEOUT (60 * 255)
#define WATCHDOG_PULSE_WIDTH 125 /* 125 ms, default pulse width for
watchdog signal */
#define WATCHDOG_F71862FG_PIN 63 /* default watchdog reset output
pin number 63 */
static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");
static int timeout = WATCHDOG_TIMEOUT; /* default timeout in seconds */
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout,
"Watchdog timeout in seconds. 1<= timeout <="
__MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
module_param(pulse_width, uint, 0);
MODULE_PARM_DESC(pulse_width,
"Watchdog signal pulse width. 0(=level), 1, 25, 30, 125, 150, 5000 or 6000 ms"
" (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
module_param(f71862fg_pin, uint, 0);
MODULE_PARM_DESC(f71862fg_pin,
"Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
" (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0444);
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
static unsigned int start_withtimeout;
module_param(start_withtimeout, uint, 0);
MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
" given initial timeout. Zero (default) disables this feature.");
enum chips { f71808fg, f71858fg, f71862fg, f71868, f71869, f71882fg, f71889fg,
f81803, f81865, f81866, f81966};
static const char * const fintek_wdt_names[] = {
"f71808fg",
"f71858fg",
"f71862fg",
"f71868",
"f71869",
"f71882fg",
"f71889fg",
"f81803",
"f81865",
"f81866",
"f81966"
};
/* Super-I/O Function prototypes */
static inline int superio_inb(int base, int reg);
static inline int superio_inw(int base, int reg);
static inline void superio_outb(int base, int reg, u8 val);
static inline void superio_set_bit(int base, int reg, int bit);
static inline void superio_clear_bit(int base, int reg, int bit);
static inline int superio_enter(int base);
static inline void superio_select(int base, int ld);
static inline void superio_exit(int base);
struct fintek_wdt {
struct watchdog_device wdd;
unsigned short sioaddr;
enum chips type;
struct watchdog_info ident;
u8 timer_val; /* content for the wd_time register */
char minutes_mode;
u8 pulse_val; /* pulse width flag */
char pulse_mode; /* enable pulse output mode? */
};
struct fintek_wdt_pdata {
enum chips type;
};
/* Super I/O functions */
static inline int superio_inb(int base, int reg)
{
outb(reg, base);
return inb(base + 1);
}
static int superio_inw(int base, int reg)
{
int val;
val = superio_inb(base, reg) << 8;
val |= superio_inb(base, reg + 1);
return val;
}
static inline void superio_outb(int base, int reg, u8 val)
{
outb(reg, base);
outb(val, base + 1);
}
static inline void superio_set_bit(int base, int reg, int bit)
{
unsigned long val = superio_inb(base, reg);
__set_bit(bit, &val);
superio_outb(base, reg, val);
}
static inline void superio_clear_bit(int base, int reg, int bit)
{
unsigned long val = superio_inb(base, reg);
__clear_bit(bit, &val);
superio_outb(base, reg, val);
}
static inline int superio_enter(int base)
{
/* Don't step on other drivers' I/O space by accident */
if (!request_muxed_region(base, 2, DRVNAME)) {
pr_err("I/O address 0x%04x already in use\n", (int)base);
return -EBUSY;
}
/* according to the datasheet the key must be sent twice! */
outb(SIO_UNLOCK_KEY, base);
outb(SIO_UNLOCK_KEY, base);
return 0;
}
static inline void superio_select(int base, int ld)
{
outb(SIO_REG_LDSEL, base);
outb(ld, base + 1);
}
static inline void superio_exit(int base)
{
outb(SIO_LOCK_KEY, base);
release_region(base, 2);
}
static int fintek_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout)
{
struct fintek_wdt *wd = watchdog_get_drvdata(wdd);
if (timeout > 0xff) {
wd->timer_val = DIV_ROUND_UP(timeout, 60);
wd->minutes_mode = true;
timeout = wd->timer_val * 60;
} else {
wd->timer_val = timeout;
wd->minutes_mode = false;
}
wdd->timeout = timeout;
return 0;
}
static int fintek_wdt_set_pulse_width(struct fintek_wdt *wd, unsigned int pw)
{
unsigned int t1 = 25, t2 = 125, t3 = 5000;
if (wd->type == f71868) {
t1 = 30;
t2 = 150;
t3 = 6000;
}
if (pw <= 1) {
wd->pulse_val = 0;
} else if (pw <= t1) {
wd->pulse_val = 1;
} else if (pw <= t2) {
wd->pulse_val = 2;
} else if (pw <= t3) {
wd->pulse_val = 3;
} else {
pr_err("pulse width out of range\n");
return -EINVAL;
}
wd->pulse_mode = pw;
return 0;
}
static int fintek_wdt_keepalive(struct watchdog_device *wdd)
{
struct fintek_wdt *wd = watchdog_get_drvdata(wdd);
int err;
err = superio_enter(wd->sioaddr);
if (err)
return err;
superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
if (wd->minutes_mode)
/* select minutes for timer units */
superio_set_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
F71808FG_FLAG_WD_UNIT);
else
/* select seconds for timer units */
superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
F71808FG_FLAG_WD_UNIT);
/* Set timer value */
superio_outb(wd->sioaddr, F71808FG_REG_WD_TIME,
wd->timer_val);
superio_exit(wd->sioaddr);
return 0;
}
static int fintek_wdt_start(struct watchdog_device *wdd)
{
struct fintek_wdt *wd = watchdog_get_drvdata(wdd);
int err;
u8 tmp;
/* Make sure we don't die as soon as the watchdog is enabled below */
err = fintek_wdt_keepalive(wdd);
if (err)
return err;
err = superio_enter(wd->sioaddr);
if (err)
return err;
superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
/* Watchdog pin configuration */
switch (wd->type) {
case f71808fg:
/* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT2, 3);
superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT3, 3);
break;
case f71862fg:
if (f71862fg_pin == 63) {
/* SPI must be disabled first to use this pin! */
superio_clear_bit(wd->sioaddr, SIO_REG_ROM_ADDR_SEL, 6);
superio_set_bit(wd->sioaddr, SIO_REG_MFUNCT3, 4);
} else if (f71862fg_pin == 56) {
superio_set_bit(wd->sioaddr, SIO_REG_MFUNCT1, 1);
}
break;
case f71868:
case f71869:
/* GPIO14 --> WDTRST# */
superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT1, 4);
break;
case f71882fg:
/* Set pin 56 to WDTRST# */
superio_set_bit(wd->sioaddr, SIO_REG_MFUNCT1, 1);
break;
case f71889fg:
/* set pin 40 to WDTRST# */
superio_outb(wd->sioaddr, SIO_REG_MFUNCT3,
superio_inb(wd->sioaddr, SIO_REG_MFUNCT3) & 0xcf);
break;
case f81803:
/* Enable TSI Level register bank */
superio_clear_bit(wd->sioaddr, SIO_REG_CLOCK_SEL, 3);
/* Set pin 27 to WDTRST# */
superio_outb(wd->sioaddr, SIO_REG_TSI_LEVEL_SEL, 0x5f &
superio_inb(wd->sioaddr, SIO_REG_TSI_LEVEL_SEL));
break;
case f81865:
/* Set pin 70 to WDTRST# */
superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT3, 5);
break;
case f81866:
case f81966:
/*
* GPIO1 Control Register when 27h BIT3:2 = 01 & BIT0 = 0.
* The PIN 70(GPIO15/WDTRST) is controlled by 2Ch:
* BIT5: 0 -> WDTRST#
* 1 -> GPIO15
*/
tmp = superio_inb(wd->sioaddr, SIO_F81866_REG_PORT_SEL);
tmp &= ~(BIT(3) | BIT(0));
tmp |= BIT(2);
superio_outb(wd->sioaddr, SIO_F81866_REG_PORT_SEL, tmp);
superio_clear_bit(wd->sioaddr, SIO_F81866_REG_GPIO1, 5);
break;
default:
/*
* 'default' label to shut up the compiler and catch
* programmer errors
*/
err = -ENODEV;
goto exit_superio;
}
superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
superio_set_bit(wd->sioaddr, SIO_REG_ENABLE, 0);
if (wd->type == f81865 || wd->type == f81866 || wd->type == f81966)
superio_set_bit(wd->sioaddr, F81865_REG_WDO_CONF,
F81865_FLAG_WDOUT_EN);
else
superio_set_bit(wd->sioaddr, F71808FG_REG_WDO_CONF,
F71808FG_FLAG_WDOUT_EN);
superio_set_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
F71808FG_FLAG_WD_EN);
if (wd->pulse_mode) {
/* Select "pulse" output mode with given duration */
u8 wdt_conf = superio_inb(wd->sioaddr,
F71808FG_REG_WDT_CONF);
/* Set WD_PSWIDTH bits (1:0) */
wdt_conf = (wdt_conf & 0xfc) | (wd->pulse_val & 0x03);
/* Set WD_PULSE to "pulse" mode */
wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
superio_outb(wd->sioaddr, F71808FG_REG_WDT_CONF,
wdt_conf);
} else {
/* Select "level" output mode */
superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
F71808FG_FLAG_WD_PULSE);
}
exit_superio:
superio_exit(wd->sioaddr);
return err;
}
static int fintek_wdt_stop(struct watchdog_device *wdd)
{
struct fintek_wdt *wd = watchdog_get_drvdata(wdd);
int err;
err = superio_enter(wd->sioaddr);
if (err)
return err;
superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
F71808FG_FLAG_WD_EN);
superio_exit(wd->sioaddr);
return 0;
}
static bool fintek_wdt_is_running(struct fintek_wdt *wd, u8 wdt_conf)
{
return (superio_inb(wd->sioaddr, SIO_REG_ENABLE) & BIT(0))
&& (wdt_conf & BIT(F71808FG_FLAG_WD_EN));
}
static const struct watchdog_ops fintek_wdt_ops = {
.owner = THIS_MODULE,
.start = fintek_wdt_start,
.stop = fintek_wdt_stop,
.ping = fintek_wdt_keepalive,
.set_timeout = fintek_wdt_set_timeout,
};
static int fintek_wdt_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct fintek_wdt_pdata *pdata;
struct watchdog_device *wdd;
struct fintek_wdt *wd;
int wdt_conf, err = 0;
struct resource *res;
int sioaddr;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!res)
return -ENXIO;
sioaddr = res->start;
wd = devm_kzalloc(dev, sizeof(*wd), GFP_KERNEL);
if (!wd)
return -ENOMEM;
pdata = dev->platform_data;
wd->type = pdata->type;
wd->sioaddr = sioaddr;
wd->ident.options = WDIOF_SETTIMEOUT
| WDIOF_MAGICCLOSE
| WDIOF_KEEPALIVEPING
| WDIOF_CARDRESET;
snprintf(wd->ident.identity,
sizeof(wd->ident.identity), "%s watchdog",
fintek_wdt_names[wd->type]);
err = superio_enter(sioaddr);
if (err)
return err;
superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
/*
* We don't want WDTMOUT_STS to stick around till regular reboot.
* Write 1 to the bit to clear it to zero.
*/
superio_outb(sioaddr, F71808FG_REG_WDT_CONF,
wdt_conf | BIT(F71808FG_FLAG_WDTMOUT_STS));
wdd = &wd->wdd;
if (fintek_wdt_is_running(wd, wdt_conf))
set_bit(WDOG_HW_RUNNING, &wdd->status);
superio_exit(sioaddr);
wdd->parent = dev;
wdd->info = &wd->ident;
wdd->ops = &fintek_wdt_ops;
wdd->min_timeout = 1;
wdd->max_timeout = WATCHDOG_MAX_TIMEOUT;
watchdog_set_drvdata(wdd, wd);
watchdog_set_nowayout(wdd, nowayout);
watchdog_stop_on_unregister(wdd);
watchdog_stop_on_reboot(wdd);
watchdog_init_timeout(wdd, start_withtimeout ?: timeout, NULL);
if (wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS))
wdd->bootstatus = WDIOF_CARDRESET;
/*
* WATCHDOG_HANDLE_BOOT_ENABLED can result in keepalive being directly
* called without a set_timeout before, so it needs to be done here
* unconditionally.
*/
fintek_wdt_set_timeout(wdd, wdd->timeout);
fintek_wdt_set_pulse_width(wd, pulse_width);
if (start_withtimeout) {
err = fintek_wdt_start(wdd);
if (err) {
dev_err(dev, "cannot start watchdog timer\n");
return err;
}
set_bit(WDOG_HW_RUNNING, &wdd->status);
dev_info(dev, "watchdog started with initial timeout of %u sec\n",
start_withtimeout);
}
return devm_watchdog_register_device(dev, wdd);
}
static int __init fintek_wdt_find(int sioaddr)
{
enum chips type;
u16 devid;
int err = superio_enter(sioaddr);
if (err)
return err;
devid = superio_inw(sioaddr, SIO_REG_MANID);
if (devid != SIO_FINTEK_ID) {
pr_debug("Not a Fintek device\n");
err = -ENODEV;
goto exit;
}
devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
switch (devid) {
case SIO_F71808_ID:
type = f71808fg;
break;
case SIO_F71862_ID:
type = f71862fg;
break;
case SIO_F71868_ID:
type = f71868;
break;
case SIO_F71869_ID:
case SIO_F71869A_ID:
type = f71869;
break;
case SIO_F71882_ID:
type = f71882fg;
break;
case SIO_F71889_ID:
type = f71889fg;
break;
case SIO_F71858_ID:
/* Confirmed (by datasheet) not to have a watchdog. */
err = -ENODEV;
goto exit;
case SIO_F81803_ID:
type = f81803;
break;
case SIO_F81865_ID:
type = f81865;
break;
case SIO_F81866_ID:
type = f81866;
break;
case SIO_F81966_ID:
type = f81966;
break;
default:
pr_info("Unrecognized Fintek device: %04x\n",
(unsigned int)devid);
err = -ENODEV;
goto exit;
}
pr_info("Found %s watchdog chip, revision %d\n",
fintek_wdt_names[type],
(int)superio_inb(sioaddr, SIO_REG_DEVREV));
exit:
superio_exit(sioaddr);
return err ? err : type;
}
static struct platform_driver fintek_wdt_driver = {
.probe = fintek_wdt_probe,
.driver = {
.name = DRVNAME,
},
};
static struct platform_device *fintek_wdt_pdev;
static int __init fintek_wdt_init(void)
{
static const unsigned short addrs[] = { 0x2e, 0x4e };
struct fintek_wdt_pdata pdata;
struct resource wdt_res = {};
int ret;
int i;
if (f71862fg_pin != 63 && f71862fg_pin != 56) {
pr_err("Invalid argument f71862fg_pin=%d\n", f71862fg_pin);
return -EINVAL;
}
for (i = 0; i < ARRAY_SIZE(addrs); i++) {
ret = fintek_wdt_find(addrs[i]);
if (ret >= 0)
break;
}
if (i == ARRAY_SIZE(addrs))
return ret;
pdata.type = ret;
ret = platform_driver_register(&fintek_wdt_driver);
if (ret)
return ret;
wdt_res.name = "superio port";
wdt_res.flags = IORESOURCE_IO;
wdt_res.start = addrs[i];
wdt_res.end = addrs[i] + 1;
fintek_wdt_pdev = platform_device_register_resndata(NULL, DRVNAME, -1,
&wdt_res, 1,
&pdata, sizeof(pdata));
if (IS_ERR(fintek_wdt_pdev)) {
platform_driver_unregister(&fintek_wdt_driver);
return PTR_ERR(fintek_wdt_pdev);
}
return 0;
}
static void __exit fintek_wdt_exit(void)
{
platform_device_unregister(fintek_wdt_pdev);
platform_driver_unregister(&fintek_wdt_driver);
}
MODULE_DESCRIPTION("F71808E Watchdog Driver");
MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
MODULE_LICENSE("GPL");
module_init(fintek_wdt_init);
module_exit(fintek_wdt_exit);
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