--- /dev/null
+/*
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/fs.h>
+#include <linux/kernel.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 <linux/io.h>
+#include <linux/uaccess.h>
+
+
+enum {
+ ASMTYPE_UNKNOWN,
+ ASMTYPE_TOPAZ,
+ ASMTYPE_JASPER,
+ ASMTYPE_PEARL,
+ ASMTYPE_JUNIPER,
+ ASMTYPE_SPRUCE,
+};
+
+#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 bool 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 DEFINE_SPINLOCK(asr_lock);
+
+static void __asr_toggle(void)
+{
+ unsigned char reg;
+
+ 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_toggle(void)
+{
+ spin_lock(&asr_lock);
+ __asr_toggle();
+ spin_unlock(&asr_lock);
+}
+
+static void asr_enable(void)
+{
+ unsigned char reg;
+
+ spin_lock(&asr_lock);
+ 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);
+ spin_unlock(&asr_lock);
+}
+
+static void asr_disable(void)
+{
+ unsigned char reg;
+
+ spin_lock(&asr_lock);
+ 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);
+ spin_unlock(&asr_lock);
+}
+
+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 ";
+#if 0
+ u32 r;
+ /* Suggested fix */
+ pdev = pci_get_bus_and_slot(0, DEVFN(0x1f, 0));
+ if (pdev == NULL)
+ return -ENODEV;
+ pci_read_config_dword(pdev, 0x58, &r);
+ asr_base = r & 0xFFFE;
+ pci_dev_put(pdev);
+#else
+ /* 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);
+
+ /* BUS 0, Slot 1F, fnc 0, offset 58 */
+
+ /*
+ * 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);*/
+#endif
+ 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")) {
+ pr_err("address %#x already in use\n", asr_base);
+ return -EBUSY;
+ }
+
+ pr_info("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 long asr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ static const struct watchdog_info ident = {
+ .options = WDIOF_KEEPALIVEPING |
+ 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_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;
+ }
+ case WDIOC_KEEPALIVE:
+ asr_toggle();
+ return 0;
+ /*
+ * The hardware has a fixed timeout value, so no WDIOC_SETTIMEOUT
+ * and WDIOC_GETTIMEOUT always returns 256.
+ */
+ case WDIOC_GETTIMEOUT:
+ heartbeat = 256;
+ return put_user(heartbeat, p);
+ default:
+ return -ENOTTY;
+ }
+}
+
+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 {
+ pr_crit("unexpected close, not stopping watchdog!\n");
+ asr_toggle();
+ }
+ clear_bit(0, &asr_is_open);
+ asr_expect_close = 0;
+ return 0;
+}
+
+static const struct file_operations asr_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = asr_write,
+ .unlocked_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 ibmasr_id_table[] __initdata = {
+ { "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 = asr_get_base_address();
+ if (rc)
+ return rc;
+
+ rc = misc_register(&asr_miscdev);
+ if (rc < 0) {
+ release_region(asr_base, asr_length);
+ pr_err("failed to register misc device\n");
+ 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, bool, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+MODULE_DESCRIPTION("IBM Automatic Server Restart driver");
+MODULE_AUTHOR("Andrey Panin");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff