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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/watchdog.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/kref.h>
#include <linux/slab.h>
#include "sch56xx-common.h"
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
#define SIO_SCH56XX_LD_EM 0x0C /* Embedded uController Logical Dev */
#define SIO_UNLOCK_KEY 0x55 /* 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 */
#define SIO_REG_ENABLE 0x30 /* Logical device enable */
#define SIO_REG_ADDR 0x66 /* Logical device address (2 bytes) */
#define SIO_SCH5627_ID 0xC6 /* Chipset ID */
#define SIO_SCH5636_ID 0xC7 /* Chipset ID */
#define REGION_LENGTH 10
#define SCH56XX_CMD_READ 0x02
#define SCH56XX_CMD_WRITE 0x03
#define SCH56XX_REG_WDOG_PRESET 0x58B
#define SCH56XX_REG_WDOG_CONTROL 0x58C
#define SCH56XX_WDOG_TIME_BASE_SEC 0x01
#define SCH56XX_REG_WDOG_OUTPUT_ENABLE 0x58E
#define SCH56XX_WDOG_OUTPUT_ENABLE 0x02
struct sch56xx_watchdog_data {
u16 addr;
struct mutex *io_lock;
struct kref kref;
struct watchdog_info wdinfo;
struct watchdog_device wddev;
u8 watchdog_preset;
u8 watchdog_control;
u8 watchdog_output_enable;
};
static struct platform_device *sch56xx_pdev;
static inline int superio_inb(int base, int reg)
{
outb(reg, base);
return inb(base + 1);
}
static inline int superio_enter(int base)
{
if (!request_muxed_region(base, 2, "sch56xx")) {
pr_err("I/O address 0x%04x already in use
", base);
return -EBUSY;
}
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 sch56xx_send_cmd(u16 addr, u8 cmd, u16 reg, u8 v)
{
u8 val;
int i;
const int max_busy_polls = 64;
const int max_lazy_polls = 32;
val = inb(addr + 1);
outb(val, addr + 1);
outb(0x00, addr + 2);
outb(0x80, addr + 3);
outb(cmd, addr + 4);
outb(0x01, addr + 5);
outb(0x04, addr + 2);
if (cmd == SCH56XX_CMD_WRITE)
outb(v, addr + 4);
outb(reg & 0xff, addr + 6);
outb(reg >> 8, addr + 7);
outb(0x01, addr);
for (i = 0; i < max_busy_polls + max_lazy_polls; i++) {
if (i >= max_busy_polls)
msleep(1);
val = inb(addr + 8);
if (val)
outb(val, addr + 8);
if (val & 0x01)
break;
}
if (i == max_busy_polls + max_lazy_polls) {
pr_err("Max retries exceeded reading virtual register 0x%04hx (%d)
",
reg, 1);
return -EIO;
}
for (i = 0; i < max_busy_polls; i++) {
val = inb(addr + 1);
if (val == 0x01)
break;
if (i == 0)
pr_warn("EC reports: 0x%02x reading virtual register 0x%04hx
",
(unsigned int)val, reg);
}
if (i == max_busy_polls) {
pr_err("Max retries exceeded reading virtual register 0x%04hx (%d)
",
reg, 2);
return -EIO;
}
if (cmd == SCH56XX_CMD_READ)
return inb(addr + 4);
return 0;
}
int sch56xx_read_virtual_reg(u16 addr, u16 reg)
{
return sch56xx_send_cmd(addr, SCH56XX_CMD_READ, reg, 0);
}
EXPORT_SYMBOL(sch56xx_read_virtual_reg);
int sch56xx_write_virtual_reg(u16 addr, u16 reg, u8 val)
{
return sch56xx_send_cmd(addr, SCH56XX_CMD_WRITE, reg, val);
}
EXPORT_SYMBOL(sch56xx_write_virtual_reg);
int sch56xx_read_virtual_reg16(u16 addr, u16 reg)
{
int lsb, msb;
lsb = sch56xx_read_virtual_reg(addr, reg);
if (lsb < 0)
return lsb;
msb = sch56xx_read_virtual_reg(addr, reg + 1);
if (msb < 0)
return msb;
return lsb | (msb << 8);
}
EXPORT_SYMBOL(sch56xx_read_virtual_reg16);
int sch56xx_read_virtual_reg12(u16 addr, u16 msb_reg, u16 lsn_reg,
int high_nibble)
{
int msb, lsn;
msb = sch56xx_read_virtual_reg(addr, msb_reg);
if (msb < 0)
return msb;
lsn = sch56xx_read_virtual_reg(addr, lsn_reg);
if (lsn < 0)
return lsn;
if (high_nibble)
return (msb << 4) | (lsn >> 4);
else
return (msb << 4) | (lsn & 0x0f);
}
EXPORT_SYMBOL(sch56xx_read_virtual_reg12);
static void watchdog_release_resources(struct kref *r)
{
struct sch56xx_watchdog_data *data =
container_of(r, struct sch56xx_watchdog_data, kref);
kfree(data);
}
static int watchdog_set_timeout(struct watchdog_device *wddev,
unsigned int timeout)
{
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
unsigned int resolution;
u8 control;
int ret;
if (timeout <= 255)
resolution = 1;
else
resolution = 60;
if (timeout < resolution || timeout > (resolution * 255))
return -EINVAL;
if (resolution == 1)
control = data->watchdog_control | SCH56XX_WDOG_TIME_BASE_SEC;
else
control = data->watchdog_control & ~SCH56XX_WDOG_TIME_BASE_SEC;
if (data->watchdog_control != control) {
mutex_lock(data->io_lock);
ret = sch56xx_write_virtual_reg(data->addr,
SCH56XX_REG_WDOG_CONTROL,
control);
mutex_unlock(data->io_lock);
if (ret)
return ret;
data->watchdog_control = control;
}
data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
wddev->timeout = data->watchdog_preset * resolution;
return 0;
}
static int watchdog_start(struct watchdog_device *wddev)
{
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
int ret;
u8 val;
mutex_lock(data->io_lock);
ret = sch56xx_write_virtual_reg(data->addr, SCH56XX_REG_WDOG_PRESET,
data->watchdog_preset);
if (ret)
goto leave;
val = data->watchdog_output_enable | SCH56XX_WDOG_OUTPUT_ENABLE;
ret = sch56xx_write_virtual_reg(data->addr,
SCH56XX_REG_WDOG_OUTPUT_ENABLE, val);
if (ret)
goto leave;
data->watchdog_output_enable = val;
val = inb(data->addr + 9);
if (val & 0x01)
outb(0x01, data->addr + 9);
leave:
mutex_unlock(data->io_lock);
return ret;
}
static int watchdog_trigger(struct watchdog_device *wddev)
{
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
int ret;
mutex_lock(data->io_lock);
ret = sch56xx_write_virtual_reg(data->addr, SCH56XX_REG_WDOG_PRESET,
data->watchdog_preset);
mutex_unlock(data->io_lock);
return ret;
}
static int watchdog_stop(struct watchdog_device *wddev)
{
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
int ret = 0;
u8 val;
val = data->watchdog_output_enable & ~SCH56XX_WDOG_OUTPUT_ENABLE;
mutex_lock(data->io_lock);
ret = sch56xx_write_virtual_reg(data->addr,
SCH56XX_REG_WDOG_OUTPUT_ENABLE, val);
mutex_unlock(data->io_lock);
if (ret)
return ret;
data->watchdog_output_enable = val;
return 0;
}
static void watchdog_ref(struct watchdog_device *wddev)
{
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
kref_get(&data->kref);
}
static void watchdog_unref(struct watchdog_device *wddev)
{
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
kref_put(&data->kref, watchdog_release_resources);
}
static const struct watchdog_ops watchdog_ops = {
.owner = THIS_MODULE,
.start = watchdog_start,
.stop = watchdog_stop,
.ping = watchdog_trigger,
.set_timeout = watchdog_set_timeout,
.ref = watchdog_ref,
.unref = watchdog_unref,
};
struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
u16 addr, u32 revision, struct mutex *io_lock, int check_enabled)
{
struct sch56xx_watchdog_data *data;
int err, control, output_enable;
mutex_lock(io_lock);
control =
sch56xx_read_virtual_reg(addr, SCH56XX_REG_WDOG_CONTROL);
output_enable =
sch56xx_read_virtual_reg(addr, SCH56XX_REG_WDOG_OUTPUT_ENABLE);
mutex_unlock(io_lock);
if (control < 0)
return NULL;
if (output_enable < 0)
return NULL;
if (check_enabled && !(output_enable & SCH56XX_WDOG_OUTPUT_ENABLE)) {
pr_warn("Watchdog not enabled by BIOS, not registering
");
return NULL;
}
data = kzalloc(sizeof(struct sch56xx_watchdog_data), GFP_KERNEL);
if (!data)
return NULL;
data->addr = addr;
data->io_lock = io_lock;
kref_init(&data->kref);
strlcpy(data->wdinfo.identity, "sch56xx watchdog",
sizeof(data->wdinfo.identity));
data->wdinfo.firmware_version = revision;
data->wdinfo.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT;
if (!nowayout)
data->wdinfo.options |= WDIOF_MAGICCLOSE;
data->wddev.info = &data->wdinfo;
data->wddev.ops = &watchdog_ops;
data->wddev.parent = parent;
data->wddev.timeout = 60;
data->wddev.min_timeout = 1;
data->wddev.max_timeout = 255 * 60;
if (nowayout)
set_bit(WDOG_NO_WAY_OUT, &data->wddev.status);
if (output_enable & SCH56XX_WDOG_OUTPUT_ENABLE)
set_bit(WDOG_ACTIVE, &data->wddev.status);
if (control & SCH56XX_WDOG_TIME_BASE_SEC)
data->watchdog_preset = 60;
else
data->watchdog_preset = 1;
data->watchdog_control = control;
data->watchdog_output_enable = output_enable;
watchdog_set_drvdata(&data->wddev, data);
err = watchdog_register_device(&data->wddev);
if (err) {
pr_err("Registering watchdog chardev: %d
", err);
kfree(data);
return NULL;
}
return data;
}
EXPORT_SYMBOL(sch56xx_watchdog_register);
void sch56xx_watchdog_unregister(struct sch56xx_watchdog_data *data)
{
watchdog_unregister_device(&data->wddev);
kref_put(&data->kref, watchdog_release_resources);
}
EXPORT_SYMBOL(sch56xx_watchdog_unregister);
static int __init sch56xx_find(int sioaddr, const char **name)
{
u8 devid;
unsigned short address;
int err;
err = superio_enter(sioaddr);
if (err)
return err;
devid = superio_inb(sioaddr, SIO_REG_DEVID);
switch (devid) {
case SIO_SCH5627_ID:
*name = "sch5627";
break;
case SIO_SCH5636_ID:
*name = "sch5636";
break;
default:
pr_debug("Unsupported device id: 0x%02x
",
(unsigned int)devid);
err = -ENODEV;
goto exit;
}
superio_select(sioaddr, SIO_SCH56XX_LD_EM);
if (!(superio_inb(sioaddr, SIO_REG_ENABLE) & 0x01)) {
pr_warn("Device not activated
");
err = -ENODEV;
goto exit;
}
address = superio_inb(sioaddr, SIO_REG_ADDR) |
superio_inb(sioaddr, SIO_REG_ADDR + 1) << 8;
if (address == 0) {
pr_warn("Base address not set
");
err = -ENODEV;
goto exit;
}
err = address;
exit:
superio_exit(sioaddr);
return err;
}
static int __init sch56xx_device_add(int address, const char *name)
{
struct resource res = {
.start = address,
.end = address + REGION_LENGTH - 1,
.flags = IORESOURCE_IO,
};
int err;
sch56xx_pdev = platform_device_alloc(name, address);
if (!sch56xx_pdev)
return -ENOMEM;
res.name = sch56xx_pdev->name;
err = acpi_check_resource_conflict(&res);
if (err)
goto exit_device_put;
err = platform_device_add_resources(sch56xx_pdev, &res, 1);
if (err) {
pr_err("Device resource addition failed
");
goto exit_device_put;
}
err = platform_device_add(sch56xx_pdev);
if (err) {
pr_err("Device addition failed
");
goto exit_device_put;
}
return 0;
exit_device_put:
platform_device_put(sch56xx_pdev);
return err;
}
static int __init sch56xx_init(void)
{
int address;
const char *name = NULL;
address = sch56xx_find(0x4e, &name);
if (address < 0)
address = sch56xx_find(0x2e, &name);
if (address < 0)
return address;
return sch56xx_device_add(address, name);
}
static void __exit sch56xx_exit(void)
{
platform_device_unregister(sch56xx_pdev);
}
MODULE_DESCRIPTION("SMSC SCH56xx Hardware Monitoring Common Code");
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_LICENSE("GPL");
module_init(sch56xx_init);
module_exit(sch56xx_exit);
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