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-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIVAwUAT3NKzROxKuMESys7AQKElw/+JyDxJSlj+g+nymkx8IVVuU8CsEwNLgRk 8KEnRfLhGtkXFLSJYWO6jzGo16F8Uqli1PdMFte/wagSv0285/HZaKlkkBVHdJ/m u40oSjgT013bBh6MQ0Oaf8pFezFUiQB5zPOA9QGaLVGDLXCmgqUgd7exaD5wRIwB ZmyItjZeAVnDfk1R+ZiNYytHAi8A5wSB+eFDCIQYgyulA1Igd1UnRtx+dRKbvc/m rWQ6KWbZHIdvP1ksd8wHHkrlUD2pEeJ8glJLsZUhMm/5oMf/8RmOCvmo8rvE/qwl eDQ1h4cGYlfjobxXZMHqAN9m7Jg2bI946HZjdb7/7oCeO6VW3FwPZ/Ic75p+wp45 HXJTItufERYk6QxShiOKvA+QexnYwY0IT5oRP4DrhdVB/X9cl2MoaZHC+RbYLQy+ /5VNZKi38iK4F9AbFamS7kd0i5QszA/ZzEzKZ6VMuOp3W/fagpn4ZJT1LIA3m4A9 Q0cj24mqeyCfjysu0TMbPtaN+Yjeu1o1OFRvM8XffbZsp5bNzuTDEvviJ2NXw4vK 4qUHulhYSEWcu9YgAZXvEWDEM78FXCkg2v/CrZXH5tyc95kUkMPcgG+QZBB5wElR FaOKpiC/BuNIGEf02IZQ4nfDxE90QwnDeoYeV+FvNj9UEOopJ5z5bMPoTHxm4cCD NypQthI85pc= =G9mT -----END PGP SIGNATURE----- Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system Pull "Disintegrate and delete asm/system.h" from David Howells: "Here are a bunch of patches to disintegrate asm/system.h into a set of separate bits to relieve the problem of circular inclusion dependencies. I've built all the working defconfigs from all the arches that I can and made sure that they don't break. The reason for these patches is that I recently encountered a circular dependency problem that came about when I produced some patches to optimise get_order() by rewriting it to use ilog2(). This uses bitops - and on the SH arch asm/bitops.h drags in asm-generic/get_order.h by a circuituous route involving asm/system.h. The main difficulty seems to be asm/system.h. It holds a number of low level bits with no/few dependencies that are commonly used (eg. memory barriers) and a number of bits with more dependencies that aren't used in many places (eg. switch_to()). These patches break asm/system.h up into the following core pieces: (1) asm/barrier.h Move memory barriers here. This already done for MIPS and Alpha. (2) asm/switch_to.h Move switch_to() and related stuff here. (3) asm/exec.h Move arch_align_stack() here. Other process execution related bits could perhaps go here from asm/processor.h. (4) asm/cmpxchg.h Move xchg() and cmpxchg() here as they're full word atomic ops and frequently used by atomic_xchg() and atomic_cmpxchg(). (5) asm/bug.h Move die() and related bits. (6) asm/auxvec.h Move AT_VECTOR_SIZE_ARCH here. Other arch headers are created as needed on a per-arch basis." Fixed up some conflicts from other header file cleanups and moving code around that has happened in the meantime, so David's testing is somewhat weakened by that. We'll find out anything that got broken and fix it.. * tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits) Delete all instances of asm/system.h Remove all #inclusions of asm/system.h Add #includes needed to permit the removal of asm/system.h Move all declarations of free_initmem() to linux/mm.h Disintegrate asm/system.h for OpenRISC Split arch_align_stack() out from asm-generic/system.h Split the switch_to() wrapper out of asm-generic/system.h Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h Create asm-generic/barrier.h Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] Disintegrate asm/system.h for Tile Disintegrate asm/system.h for Sparc Disintegrate asm/system.h for SH Disintegrate asm/system.h for Score Disintegrate asm/system.h for S390 Disintegrate asm/system.h for PowerPC Disintegrate asm/system.h for PA-RISC Disintegrate asm/system.h for MN10300 ...
267 lines
5.3 KiB
C
267 lines
5.3 KiB
C
/*
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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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static bool 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_MUTEX(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(data, DATA_PORT);
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msleep(200);
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outb(command, COMMAND_PORT);
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msleep(100);
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}
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static void wdt_enable(void)
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{
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mutex_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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mutex_unlock(&wdt_lock);
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}
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static void wdt_disable(void)
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{
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mutex_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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mutex_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 const 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_warn("Device closed unexpectedly - 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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const char *brd_name;
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brd_name = dmi_get_system_info(DMI_BOARD_NAME);
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if (!brd_name || !strstr(brd_name, "SBC-FITPC2"))
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return -ENODEV;
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pr_info("%s found\n", brd_name);
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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 seconds, you tried to set %d\n",
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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, bool, 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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