[WATCHDOG] add SBC-FITPC2 watchdog driver
Add support for watchdog found on SBC-FITPC2 board. Signed-off-by: Denis Turischev <denis@compulab.co.il> Signed-off-by: Mike Rapoport <mike@compulab.co.il> Signed-off-by: Wim Van Sebroeck <wim@iguana.be> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>hifive-unleashed-5.1
Denis Turischev
Wim Van Sebroeck
parent
df58bee21e
commit
3a5f90002e
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@ -369,6 +369,28 @@ config SC520_WDT
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You can compile this driver directly into the kernel, or use
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it as a module. The module will be called sc520_wdt.
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config SBC_FITPC2_WATCHDOG
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tristate "Compulab SBC-FITPC2 watchdog"
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depends on X86
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---help---
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This is the driver for the built-in watchdog timer on the fit-PC2
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Single-board computer made by Compulab.
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It`s possible to enable watchdog timer either from BIOS (F2) or from booted Linux.
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When "Watchdog Timer Value" enabled one can set 31-255 s operational range.
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Entering BIOS setup temporary disables watchdog operation regardless to current state,
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so system will not be restarted while user in BIOS setup.
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Once watchdog was enabled the system will be restarted every
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"Watchdog Timer Value" period, so to prevent it user can restart or
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disable the watchdog.
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To compile this driver as a module, choose M here: the
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module will be called sbc_fitpc2_wdt.
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Most people will say N.
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config EUROTECH_WDT
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tristate "Eurotech CPU-1220/1410 Watchdog Timer"
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depends on X86
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@ -64,6 +64,7 @@ obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o
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obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
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obj-$(CONFIG_GEODE_WDT) += geodewdt.o
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obj-$(CONFIG_SC520_WDT) += sc520_wdt.o
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obj-$(CONFIG_SBC_FITPC2_WATCHDOG) += sbc_fitpc2_wdt.o
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obj-$(CONFIG_EUROTECH_WDT) += eurotechwdt.o
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obj-$(CONFIG_IB700_WDT) += ib700wdt.o
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obj-$(CONFIG_IBMASR) += ibmasr.o
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@ -0,0 +1,267 @@
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/*
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* Watchdog driver for SBC-FITPC2 board
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*
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* Author: Denis Turischev <denis@compulab.co.il>
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*
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* Adapted from the IXP2000 watchdog driver by Deepak Saxena.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME " WATCHDOG: " fmt
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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#include <linux/dmi.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <asm/system.h>
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static int nowayout = WATCHDOG_NOWAYOUT;
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static unsigned int margin = 60; /* (secs) Default is 1 minute */
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static unsigned long wdt_status;
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static DEFINE_SPINLOCK(wdt_lock);
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#define WDT_IN_USE 0
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#define WDT_OK_TO_CLOSE 1
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#define COMMAND_PORT 0x4c
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#define DATA_PORT 0x48
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#define IFACE_ON_COMMAND 1
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#define REBOOT_COMMAND 2
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#define WATCHDOG_NAME "SBC-FITPC2 Watchdog"
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static void wdt_send_data(unsigned char command, unsigned char data)
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{
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outb(command, COMMAND_PORT);
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mdelay(100);
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outb(data, DATA_PORT);
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mdelay(200);
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}
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static void wdt_enable(void)
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{
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spin_lock(&wdt_lock);
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wdt_send_data(IFACE_ON_COMMAND, 1);
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wdt_send_data(REBOOT_COMMAND, margin);
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spin_unlock(&wdt_lock);
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}
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static void wdt_disable(void)
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{
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spin_lock(&wdt_lock);
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wdt_send_data(IFACE_ON_COMMAND, 0);
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wdt_send_data(REBOOT_COMMAND, 0);
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spin_unlock(&wdt_lock);
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}
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static int fitpc2_wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(WDT_IN_USE, &wdt_status))
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return -EBUSY;
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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wdt_enable();
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return nonseekable_open(inode, file);
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}
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static ssize_t fitpc2_wdt_write(struct file *file, const char *data,
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size_t len, loff_t *ppos)
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{
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size_t i;
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if (!len)
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return 0;
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if (nowayout) {
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len = 0;
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goto out;
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}
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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set_bit(WDT_OK_TO_CLOSE, &wdt_status);
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}
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out:
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wdt_enable();
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return len;
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}
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static struct watchdog_info ident = {
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.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING,
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.identity = WATCHDOG_NAME,
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};
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static long fitpc2_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int ret = -ENOTTY;
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int time;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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ret = copy_to_user((struct watchdog_info *)arg, &ident,
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sizeof(ident)) ? -EFAULT : 0;
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break;
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case WDIOC_GETSTATUS:
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ret = put_user(0, (int *)arg);
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break;
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case WDIOC_GETBOOTSTATUS:
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ret = put_user(0, (int *)arg);
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break;
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case WDIOC_KEEPALIVE:
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wdt_enable();
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ret = 0;
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break;
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case WDIOC_SETTIMEOUT:
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ret = get_user(time, (int *)arg);
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if (ret)
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break;
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if (time < 31 || time > 255) {
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ret = -EINVAL;
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break;
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}
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margin = time;
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wdt_enable();
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/* Fall through */
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case WDIOC_GETTIMEOUT:
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ret = put_user(margin, (int *)arg);
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break;
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}
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return ret;
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}
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static int fitpc2_wdt_release(struct inode *inode, struct file *file)
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{
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if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) {
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wdt_disable();
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pr_info("Device disabled\n");
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} else {
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pr_warning("Device closed unexpectedly -"
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" timer will not stop\n");
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wdt_enable();
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}
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clear_bit(WDT_IN_USE, &wdt_status);
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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return 0;
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}
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static const struct file_operations fitpc2_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = fitpc2_wdt_write,
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.unlocked_ioctl = fitpc2_wdt_ioctl,
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.open = fitpc2_wdt_open,
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.release = fitpc2_wdt_release,
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};
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static struct miscdevice fitpc2_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &fitpc2_wdt_fops,
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};
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static int __init fitpc2_wdt_init(void)
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{
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int err;
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if (strcmp("SBC-FITPC2", dmi_get_system_info(DMI_BOARD_NAME))) {
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pr_info("board name is: %s. Should be SBC-FITPC2\n",
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dmi_get_system_info(DMI_BOARD_NAME));
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return -ENODEV;
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}
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if (!request_region(COMMAND_PORT, 1, WATCHDOG_NAME)) {
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pr_err("I/O address 0x%04x already in use\n", COMMAND_PORT);
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return -EIO;
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}
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if (!request_region(DATA_PORT, 1, WATCHDOG_NAME)) {
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pr_err("I/O address 0x%04x already in use\n", DATA_PORT);
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err = -EIO;
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goto err_data_port;
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}
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if (margin < 31 || margin > 255) {
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pr_err("margin must be in range 31 - 255"
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" seconds, you tried to set %d\n", margin);
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err = -EINVAL;
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goto err_margin;
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}
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err = misc_register(&fitpc2_wdt_miscdev);
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if (!err) {
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pr_err("cannot register miscdev on minor=%d (err=%d)\n",
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WATCHDOG_MINOR, err);
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goto err_margin;
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}
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return 0;
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err_margin:
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release_region(DATA_PORT, 1);
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err_data_port:
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release_region(COMMAND_PORT, 1);
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return err;
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}
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static void __exit fitpc2_wdt_exit(void)
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{
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misc_deregister(&fitpc2_wdt_miscdev);
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release_region(DATA_PORT, 1);
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release_region(COMMAND_PORT, 1);
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}
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module_init(fitpc2_wdt_init);
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module_exit(fitpc2_wdt_exit);
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MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
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MODULE_DESCRIPTION("SBC-FITPC2 Watchdog");
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module_param(margin, int, 0);
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MODULE_PARM_DESC(margin, "Watchdog margin in seconds (default 60s)");
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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