watchdog: Zodiac Aerospace RAVE Switch Watchdog Processor Driver
This patch adds a driver for the Zodiac Aerospace RAVE Watchdog Procesor. This device implements a watchdog timer, accessible over I2C. Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Martyn Welch
Wim Van Sebroeck
parent
a62a723189
commit
2a7b753a28
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@ -168,6 +168,17 @@ config XILINX_WATCHDOG
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To compile this driver as a module, choose M here: the
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module will be called of_xilinx_wdt.
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config ZIIRAVE_WATCHDOG
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tristate "Zodiac RAVE Watchdog Timer"
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depends on I2C
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select WATCHDOG_CORE
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help
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Watchdog driver for the Zodiac Aerospace RAVE Switch Watchdog
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Processor.
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To compile this driver as a module, choose M here: the
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module will be called ziirave_wdt.
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# ALPHA Architecture
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# ARM Architecture
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@ -193,5 +193,6 @@ obj-$(CONFIG_GPIO_WATCHDOG) += gpio_wdt.o
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obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
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obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
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obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
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obj-$(CONFIG_ZIIRAVE_WATCHDOG) += ziirave_wdt.o
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obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
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obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o
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@ -0,0 +1,381 @@
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/*
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* Copyright (C) 2015 Zodiac Inflight Innovations
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*
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* Author: Martyn Welch <martyn.welch@collabora.co.uk>
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*
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* Based on twl4030_wdt.c by Timo Kokkonen <timo.t.kokkonen at nokia.com>:
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*
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* Copyright (C) Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/types.h>
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#include <linux/version.h>
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#include <linux/watchdog.h>
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#define ZIIRAVE_TIMEOUT_MIN 3
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#define ZIIRAVE_TIMEOUT_MAX 255
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#define ZIIRAVE_PING_VALUE 0x0
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#define ZIIRAVE_STATE_INITIAL 0x0
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#define ZIIRAVE_STATE_OFF 0x1
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#define ZIIRAVE_STATE_ON 0x2
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static char *ziirave_reasons[] = {"power cycle", "triggered", NULL, NULL,
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"host request", NULL, "illegal configuration",
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"illegal instruction", "illegal trap",
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"unknown"};
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#define ZIIRAVE_WDT_FIRM_VER_MAJOR 0x1
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#define ZIIRAVE_WDT_BOOT_VER_MAJOR 0x3
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#define ZIIRAVE_WDT_RESET_REASON 0x5
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#define ZIIRAVE_WDT_STATE 0x6
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#define ZIIRAVE_WDT_TIMEOUT 0x7
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#define ZIIRAVE_WDT_TIME_LEFT 0x8
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#define ZIIRAVE_WDT_PING 0x9
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#define ZIIRAVE_WDT_RESET_DURATION 0xa
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struct ziirave_wdt_rev {
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unsigned char major;
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unsigned char minor;
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};
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struct ziirave_wdt_data {
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struct watchdog_device wdd;
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struct ziirave_wdt_rev bootloader_rev;
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struct ziirave_wdt_rev firmware_rev;
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int reset_reason;
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};
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static int wdt_timeout;
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module_param(wdt_timeout, int, 0);
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MODULE_PARM_DESC(wdt_timeout, "Watchdog timeout in seconds");
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static int reset_duration;
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module_param(reset_duration, int, 0);
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MODULE_PARM_DESC(reset_duration,
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"Watchdog reset pulse duration in milliseconds");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static int ziirave_wdt_revision(struct i2c_client *client,
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struct ziirave_wdt_rev *rev, u8 command)
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{
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int ret;
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ret = i2c_smbus_read_byte_data(client, command);
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if (ret < 0)
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return ret;
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rev->major = ret;
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ret = i2c_smbus_read_byte_data(client, command + 1);
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if (ret < 0)
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return ret;
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rev->minor = ret;
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return 0;
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}
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static int ziirave_wdt_set_state(struct watchdog_device *wdd, int state)
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{
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struct i2c_client *client = to_i2c_client(wdd->parent);
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return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_STATE, state);
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}
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static int ziirave_wdt_start(struct watchdog_device *wdd)
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{
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return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_ON);
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}
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static int ziirave_wdt_stop(struct watchdog_device *wdd)
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{
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return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_OFF);
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}
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static int ziirave_wdt_ping(struct watchdog_device *wdd)
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{
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struct i2c_client *client = to_i2c_client(wdd->parent);
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return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_PING,
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ZIIRAVE_PING_VALUE);
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}
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static int ziirave_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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struct i2c_client *client = to_i2c_client(wdd->parent);
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int ret;
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ret = i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_TIMEOUT, timeout);
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if (!ret)
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wdd->timeout = timeout;
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return ret;
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}
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static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd)
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{
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struct i2c_client *client = to_i2c_client(wdd->parent);
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int ret;
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ret = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIME_LEFT);
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if (ret < 0)
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ret = 0;
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return ret;
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}
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static const struct watchdog_info ziirave_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
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.identity = "Zodiac RAVE Watchdog",
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};
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static const struct watchdog_ops ziirave_wdt_ops = {
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.owner = THIS_MODULE,
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.start = ziirave_wdt_start,
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.stop = ziirave_wdt_stop,
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.ping = ziirave_wdt_ping,
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.set_timeout = ziirave_wdt_set_timeout,
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.get_timeleft = ziirave_wdt_get_timeleft,
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};
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static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev->parent);
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struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
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return sprintf(buf, "02.%02u.%02u", w_priv->firmware_rev.major,
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w_priv->firmware_rev.minor);
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}
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static DEVICE_ATTR(firmware_version, S_IRUGO, ziirave_wdt_sysfs_show_firm,
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NULL);
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static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev->parent);
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struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
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return sprintf(buf, "01.%02u.%02u", w_priv->bootloader_rev.major,
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w_priv->bootloader_rev.minor);
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}
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static DEVICE_ATTR(bootloader_version, S_IRUGO, ziirave_wdt_sysfs_show_boot,
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NULL);
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static ssize_t ziirave_wdt_sysfs_show_reason(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev->parent);
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struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
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return sprintf(buf, "%s", ziirave_reasons[w_priv->reset_reason]);
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}
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static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason,
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NULL);
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static struct attribute *ziirave_wdt_attrs[] = {
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&dev_attr_firmware_version.attr,
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&dev_attr_bootloader_version.attr,
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&dev_attr_reset_reason.attr,
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NULL
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};
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static const struct attribute_group ziirave_wdt_sysfs_files = {
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.attrs = ziirave_wdt_attrs,
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};
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static int ziirave_wdt_init_duration(struct i2c_client *client)
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{
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int ret;
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if (!reset_duration) {
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/* See if the reset pulse duration is provided in an of_node */
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if (!client->dev.of_node)
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ret = -ENODEV;
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else
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ret = of_property_read_u32(client->dev.of_node,
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"reset-duration-ms",
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&reset_duration);
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if (ret) {
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dev_info(&client->dev,
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"Unable to set reset pulse duration, using default\n");
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return 0;
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}
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}
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if (reset_duration < 1 || reset_duration > 255)
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return -EINVAL;
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dev_info(&client->dev, "Setting reset duration to %dms",
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reset_duration);
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return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_RESET_DURATION,
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reset_duration);
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}
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static int ziirave_wdt_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct ziirave_wdt_data *w_priv;
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int val;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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w_priv = devm_kzalloc(&client->dev, sizeof(*w_priv), GFP_KERNEL);
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if (!w_priv)
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return -ENOMEM;
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w_priv->wdd.info = &ziirave_wdt_info;
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w_priv->wdd.ops = &ziirave_wdt_ops;
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w_priv->wdd.min_timeout = ZIIRAVE_TIMEOUT_MIN;
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w_priv->wdd.max_timeout = ZIIRAVE_TIMEOUT_MAX;
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w_priv->wdd.parent = &client->dev;
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ret = watchdog_init_timeout(&w_priv->wdd, wdt_timeout, &client->dev);
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if (ret) {
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dev_info(&client->dev,
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"Unable to select timeout value, using default\n");
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}
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/*
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* The default value set in the watchdog should be perfectly valid, so
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* pass that in if we haven't provided one via the module parameter or
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* of property.
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*/
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if (w_priv->wdd.timeout == 0) {
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val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT);
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if (val < 0)
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return val;
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if (val < ZIIRAVE_TIMEOUT_MIN)
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return -ENODEV;
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w_priv->wdd.timeout = val;
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} else {
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ret = ziirave_wdt_set_timeout(&w_priv->wdd,
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w_priv->wdd.timeout);
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if (ret)
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return ret;
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dev_info(&client->dev, "Timeout set to %ds.",
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w_priv->wdd.timeout);
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}
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watchdog_set_nowayout(&w_priv->wdd, nowayout);
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i2c_set_clientdata(client, w_priv);
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/* If in unconfigured state, set to stopped */
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val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_STATE);
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if (val < 0)
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return val;
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if (val == ZIIRAVE_STATE_INITIAL)
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ziirave_wdt_stop(&w_priv->wdd);
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ret = ziirave_wdt_init_duration(client);
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if (ret)
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return ret;
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ret = ziirave_wdt_revision(client, &w_priv->firmware_rev,
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ZIIRAVE_WDT_FIRM_VER_MAJOR);
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if (ret)
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return ret;
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ret = ziirave_wdt_revision(client, &w_priv->bootloader_rev,
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ZIIRAVE_WDT_BOOT_VER_MAJOR);
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if (ret)
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return ret;
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w_priv->reset_reason = i2c_smbus_read_byte_data(client,
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ZIIRAVE_WDT_RESET_REASON);
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if (w_priv->reset_reason < 0)
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return w_priv->reset_reason;
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if (w_priv->reset_reason >= ARRAY_SIZE(ziirave_reasons) ||
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!ziirave_reasons[w_priv->reset_reason])
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return -ENODEV;
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ret = watchdog_register_device(&w_priv->wdd);
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if (ret)
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return ret;
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ret = sysfs_create_group(&w_priv->wdd.dev->kobj,
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&ziirave_wdt_sysfs_files);
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if (ret) {
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watchdog_unregister_device(&w_priv->wdd);
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return ret;
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}
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return 0;
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}
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static int ziirave_wdt_remove(struct i2c_client *client)
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{
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struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
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sysfs_remove_group(&client->dev.kobj, &ziirave_wdt_sysfs_files);
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watchdog_unregister_device(&w_priv->wdd);
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return 0;
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}
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static struct i2c_device_id ziirave_wdt_id[] = {
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{ "ziirave-wdt", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ziirave_wdt_id);
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static const struct of_device_id zrv_wdt_of_match[] = {
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{ .compatible = "zii,rave-wdt", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, zrv_wdt_of_match);
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static struct i2c_driver ziirave_wdt_driver = {
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.driver = {
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.name = "ziirave_wdt",
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.of_match_table = zrv_wdt_of_match,
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},
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.probe = ziirave_wdt_probe,
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.remove = ziirave_wdt_remove,
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.id_table = ziirave_wdt_id,
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};
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module_i2c_driver(ziirave_wdt_driver);
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MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.co.uk");
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MODULE_DESCRIPTION("Zodiac Aerospace RAVE Switch Watchdog Processor Driver");
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MODULE_LICENSE("GPL");
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