1 files changed, 407 insertions, 0 deletions

diff --git a/drivers/char/watchdog/ibmasr.c b/drivers/char/watchdog/ibmasr.c
new file mode 100644
index 000000000000..a32c073d29bc
--- /dev/null
+++ b/drivers/char/watchdog/ibmasr.c
@@ -0,0 +1,407 @@
+/*
+ * IBM Automatic Server Restart driver.
+ *
+ * Copyright (c) 2005 Andrey Panin <pazke@donpac.ru>
+ *
+ * Based on driver written by Pete Reynolds.
+ * Copyright (c) IBM Corporation, 1998-2004.
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU Public License, incorporated herein by reference.
+ */
+
+#include <linux/config.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/timer.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/dmi.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+
+enum {
+        ASMTYPE_UNKNOWN,
+        ASMTYPE_TOPAZ,
+        ASMTYPE_JASPER,
+        ASMTYPE_PEARL,
+        ASMTYPE_JUNIPER,
+        ASMTYPE_SPRUCE,
+};
+
+#define PFX "ibmasr: "
+
+#define TOPAZ_ASR_REG_OFFSET    4
+#define TOPAZ_ASR_TOGGLE        0x40
+#define TOPAZ_ASR_DISABLE       0x80
+
+/* PEARL ASR S/W REGISTER SUPERIO PORT ADDRESSES */
+#define PEARL_BASE      0xe04
+#define PEARL_WRITE     0xe06
+#define PEARL_READ      0xe07
+
+#define PEARL_ASR_DISABLE_MASK  0x80    /* bit 7: disable = 1, enable = 0 */
+#define PEARL_ASR_TOGGLE_MASK   0x40    /* bit 6: 0, then 1, then 0 */
+
+/* JASPER OFFSET FROM SIO BASE ADDR TO ASR S/W REGISTERS. */
+#define JASPER_ASR_REG_OFFSET   0x38
+
+#define JASPER_ASR_DISABLE_MASK 0x01    /* bit 0: disable = 1, enable = 0 */
+#define JASPER_ASR_TOGGLE_MASK  0x02    /* bit 1: 0, then 1, then 0 */
+
+#define JUNIPER_BASE_ADDRESS    0x54b   /* Base address of Juniper ASR */
+#define JUNIPER_ASR_DISABLE_MASK 0x01   /* bit 0: disable = 1 enable = 0 */
+#define JUNIPER_ASR_TOGGLE_MASK 0x02    /* bit 1: 0, then 1, then 0 */
+
+#define SPRUCE_BASE_ADDRESS     0x118e  /* Base address of Spruce ASR */
+#define SPRUCE_ASR_DISABLE_MASK 0x01    /* bit 1: disable = 1 enable = 0 */
+#define SPRUCE_ASR_TOGGLE_MASK  0x02    /* bit 0: 0, then 1, then 0 */
+
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+
+static unsigned long asr_is_open;
+static char asr_expect_close;
+
+static unsigned int asr_type, asr_base, asr_length;
+static unsigned int asr_read_addr, asr_write_addr;
+static unsigned char asr_toggle_mask, asr_disable_mask;
+
+static void asr_toggle(void)
+{
+        unsigned char reg = inb(asr_read_addr);
+
+        outb(reg & ~asr_toggle_mask, asr_write_addr);
+        reg = inb(asr_read_addr);
+
+        outb(reg | asr_toggle_mask, asr_write_addr);
+        reg = inb(asr_read_addr);
+
+        outb(reg & ~asr_toggle_mask, asr_write_addr);
+        reg = inb(asr_read_addr);
+}
+
+static void asr_enable(void)
+{
+        unsigned char reg;
+
+        if (asr_type == ASMTYPE_TOPAZ) {
+                /* asr_write_addr == asr_read_addr */
+                reg = inb(asr_read_addr);
+                outb(reg & ~(TOPAZ_ASR_TOGGLE | TOPAZ_ASR_DISABLE),
+                     asr_read_addr);
+        } else {
+                /*
+                 * First make sure the hardware timer is reset by toggling
+                 * ASR hardware timer line.
+                 */
+                asr_toggle();
+
+                reg = inb(asr_read_addr);
+                outb(reg & ~asr_disable_mask, asr_write_addr);
+        }
+        reg = inb(asr_read_addr);
+}
+
+static void asr_disable(void)
+{
+        unsigned char reg = inb(asr_read_addr);
+
+        if (asr_type == ASMTYPE_TOPAZ)
+                /* asr_write_addr == asr_read_addr */
+                outb(reg | TOPAZ_ASR_TOGGLE | TOPAZ_ASR_DISABLE,
+                     asr_read_addr);
+        else {
+                outb(reg | asr_toggle_mask, asr_write_addr);
+                reg = inb(asr_read_addr);
+
+                outb(reg | asr_disable_mask, asr_write_addr);
+        }
+        reg = inb(asr_read_addr);
+}
+
+static int __init asr_get_base_address(void)
+{
+        unsigned char low, high;
+        const char *type = "";
+
+        asr_length = 1;
+
+        switch (asr_type) {
+        case ASMTYPE_TOPAZ:
+                /* SELECT SuperIO CHIP FOR QUERYING (WRITE 0x07 TO BOTH 0x2E and 0x2F) */
+                outb(0x07, 0x2e);
+                outb(0x07, 0x2f);
+
+                /* SELECT AND READ THE HIGH-NIBBLE OF THE GPIO BASE ADDRESS */
+                outb(0x60, 0x2e);
+                high = inb(0x2f);
+
+                /* SELECT AND READ THE LOW-NIBBLE OF THE GPIO BASE ADDRESS */
+                outb(0x61, 0x2e);
+                low = inb(0x2f);
+
+                asr_base = (high << 16) | low;
+                asr_read_addr = asr_write_addr =
+                        asr_base + TOPAZ_ASR_REG_OFFSET;
+                asr_length = 5;
+
+                break;
+
+        case ASMTYPE_JASPER:
+                type = "Jaspers ";
+
+                /* FIXME: need to use pci_config_lock here, but it's not exported */
+
+/*              spin_lock_irqsave(&pci_config_lock, flags);*/
+
+                /* Select the SuperIO chip in the PCI I/O port register */
+                outl(0x8000f858, 0xcf8);
+
+                /*
+                 * Read the base address for the SuperIO chip.
+                 * Only the lower 16 bits are valid, but the address is word
+                 * aligned so the last bit must be masked off.
+                 */
+                asr_base = inl(0xcfc) & 0xfffe;
+
+/*              spin_unlock_irqrestore(&pci_config_lock, flags);*/
+
+                asr_read_addr = asr_write_addr =
+                        asr_base + JASPER_ASR_REG_OFFSET;
+                asr_toggle_mask = JASPER_ASR_TOGGLE_MASK;
+                asr_disable_mask = JASPER_ASR_DISABLE_MASK;
+                asr_length = JASPER_ASR_REG_OFFSET + 1;
+
+                break;
+
+        case ASMTYPE_PEARL:
+                type = "Pearls ";
+                asr_base = PEARL_BASE;
+                asr_read_addr = PEARL_READ;
+                asr_write_addr = PEARL_WRITE;
+                asr_toggle_mask = PEARL_ASR_TOGGLE_MASK;
+                asr_disable_mask = PEARL_ASR_DISABLE_MASK;
+                asr_length = 4;
+                break;
+
+        case ASMTYPE_JUNIPER:
+                type = "Junipers ";
+                asr_base = JUNIPER_BASE_ADDRESS;
+                asr_read_addr = asr_write_addr = asr_base;
+                asr_toggle_mask = JUNIPER_ASR_TOGGLE_MASK;
+                asr_disable_mask = JUNIPER_ASR_DISABLE_MASK;
+                break;
+
+        case ASMTYPE_SPRUCE:
+                type = "Spruce's ";
+                asr_base = SPRUCE_BASE_ADDRESS;
+                asr_read_addr = asr_write_addr = asr_base;
+                asr_toggle_mask = SPRUCE_ASR_TOGGLE_MASK;
+                asr_disable_mask = SPRUCE_ASR_DISABLE_MASK;
+                break;
+        }
+
+        if (!request_region(asr_base, asr_length, "ibmasr")) {
+                printk(KERN_ERR PFX "address %#x already in use\n",
+                        asr_base);
+                return -EBUSY;
+        }
+
+        printk(KERN_INFO PFX "found %sASR @ addr %#x\n", type, asr_base);
+
+        return 0;
+}
+
+
+static ssize_t asr_write(struct file *file, const char __user *buf,
+                         size_t count, loff_t *ppos)
+{
+        if (count) {
+                if (!nowayout) {
+                        size_t i;
+
+                        /* In case it was set long ago */
+                        asr_expect_close = 0;
+
+                        for (i = 0; i != count; i++) {
+                                char c;
+                                if (get_user(c, buf + i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        asr_expect_close = 42;
+                        }
+                }
+                asr_toggle();
+        }
+        return count;
+}
+
+static int asr_ioctl(struct inode *inode, struct file *file,
+                     unsigned int cmd, unsigned long arg)
+{
+        static const struct watchdog_info ident = {
+                .options =      WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
+                                WDIOF_MAGICCLOSE,
+                .identity =     "IBM ASR"
+        };
+        void __user *argp = (void __user *)arg;
+        int __user *p = argp;
+        int heartbeat;
+
+        switch (cmd) {
+                case WDIOC_GETSUPPORT:
+                        return copy_to_user(argp, &ident, sizeof(ident)) ?
+                                -EFAULT : 0;
+
+                case WDIOC_GETSTATUS:
+                case WDIOC_GETBOOTSTATUS:
+                        return put_user(0, p);
+
+                case WDIOC_KEEPALIVE:
+                        asr_toggle();
+                        return 0;
+
+
+                case WDIOC_SETTIMEOUT:
+                        if (get_user(heartbeat, p))
+                                return -EFAULT;
+                        /* Fall */
+
+                case WDIOC_GETTIMEOUT:
+                        heartbeat = 256;
+                        return put_user(heartbeat, p);
+
+                case WDIOC_SETOPTIONS: {
+                        int new_options, retval = -EINVAL;
+
+                        if (get_user(new_options, p))
+                                return -EFAULT;
+
+                        if (new_options & WDIOS_DISABLECARD) {
+                                asr_disable();
+                                retval = 0;
+                        }
+
+                        if (new_options & WDIOS_ENABLECARD) {
+                                asr_enable();
+                                asr_toggle();
+                                retval = 0;
+                        }
+
+                        return retval;
+                }
+        }
+
+        return -ENOIOCTLCMD;
+}
+
+static int asr_open(struct inode *inode, struct file *file)
+{
+        if(test_and_set_bit(0, &asr_is_open))
+                return -EBUSY;
+
+        asr_toggle();
+        asr_enable();
+
+        return nonseekable_open(inode, file);
+}
+
+static int asr_release(struct inode *inode, struct file *file)
+{
+        if (asr_expect_close == 42)
+                asr_disable();
+        else {
+                printk(KERN_CRIT PFX "unexpected close, not stopping watchdog!\n");
+                asr_toggle();
+        }
+        clear_bit(0, &asr_is_open);
+        asr_expect_close = 0;
+        return 0;
+}
+
+static struct file_operations asr_fops = {
+        .owner =        THIS_MODULE,
+        .llseek =       no_llseek,
+        .write =        asr_write,
+        .ioctl =        asr_ioctl,
+        .open =         asr_open,
+        .release =      asr_release,
+};
+
+static struct miscdevice asr_miscdev = {
+        .minor =        WATCHDOG_MINOR,
+        .name =         "watchdog",
+        .fops =         &asr_fops,
+};
+
+
+struct ibmasr_id {
+        const char *desc;
+        int type;
+};
+
+static struct ibmasr_id __initdata ibmasr_id_table[] = {
+        { "IBM Automatic Server Restart - eserver xSeries 220", ASMTYPE_TOPAZ },
+        { "IBM Automatic Server Restart - Machine Type 8673", ASMTYPE_PEARL },
+        { "IBM Automatic Server Restart - Machine Type 8480", ASMTYPE_JASPER },
+        { "IBM Automatic Server Restart - Machine Type 8482", ASMTYPE_JUNIPER },
+        { "IBM Automatic Server Restart - Machine Type 8648", ASMTYPE_SPRUCE },
+        { NULL }
+};
+
+static int __init ibmasr_init(void)
+{
+        struct ibmasr_id *id;
+        int rc;
+
+        for (id = ibmasr_id_table; id->desc; id++) {
+                if (dmi_find_device(DMI_DEV_TYPE_OTHER, id->desc, NULL)) {
+                        asr_type = id->type;
+                        break;
+                }
+        }
+
+        if (!asr_type)
+                return -ENODEV;
+
+        rc = misc_register(&asr_miscdev);
+        if (rc < 0) {
+                printk(KERN_ERR PFX "failed to register misc device\n");
+                return rc;
+        }
+
+        rc = asr_get_base_address();
+        if (rc) {
+                misc_deregister(&asr_miscdev);
+                return rc;
+        }
+
+        return 0;
+}
+
+static void __exit ibmasr_exit(void)
+{
+        if (!nowayout)
+                asr_disable();
+
+        misc_deregister(&asr_miscdev);
+
+        release_region(asr_base, asr_length);
+}
+
+module_init(ibmasr_init);
+module_exit(ibmasr_exit);
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+MODULE_DESCRIPTION("IBM Automatic Server Restart driver");
+MODULE_AUTHOR("Andrey Panin");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);