--- /dev/null
+/*
+ * sch311x_wdt.c - Driver for the SCH311x Super-I/O chips
+ * integrated watchdog.
+ *
+ * (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
+ * provide warranty for any of this software. This material is
+ * provided "AS-IS" and at no charge.
+ */
+
+/*
+ * Includes, defines, variables, module parameters, ...
+ */
+
+/* Includes */
+#include <linux/module.h> /* For module specific items */
+#include <linux/moduleparam.h> /* For new moduleparam's */
+#include <linux/types.h> /* For standard types (like size_t) */
+#include <linux/errno.h> /* For the -ENODEV/... values */
+#include <linux/kernel.h> /* For printk/... */
+#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
+ (WATCHDOG_MINOR) */
+#include <linux/watchdog.h> /* For the watchdog specific items */
+#include <linux/init.h> /* For __init/__exit/... */
+#include <linux/fs.h> /* For file operations */
+#include <linux/platform_device.h> /* For platform_driver framework */
+#include <linux/ioport.h> /* For io-port access */
+#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
+#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
+#include <linux/io.h> /* For inb/outb/... */
+
+/* Module and version information */
+#define DRV_NAME "sch311x_wdt"
+#define PFX DRV_NAME ": "
+
+/* Runtime registers */
+#define RESGEN 0x1d
+#define GP60 0x47
+#define WDT_TIME_OUT 0x65
+#define WDT_VAL 0x66
+#define WDT_CFG 0x67
+#define WDT_CTRL 0x68
+
+/* internal variables */
+static unsigned long sch311x_wdt_is_open;
+static char sch311x_wdt_expect_close;
+static struct platform_device *sch311x_wdt_pdev;
+
+static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e, 0x00 };
+
+static struct { /* The devices private data */
+ /* the Runtime Register base address */
+ unsigned short runtime_reg;
+ /* The card's boot status */
+ int boot_status;
+ /* the lock for io operations */
+ spinlock_t io_lock;
+} sch311x_wdt_data;
+
+/* Module load parameters */
+static unsigned short force_id;
+module_param(force_id, ushort, 0);
+MODULE_PARM_DESC(force_id, "Override the detected device ID");
+
+static unsigned short therm_trip;
+module_param(therm_trip, ushort, 0);
+MODULE_PARM_DESC(therm_trip, "Should a ThermTrip trigger the reset generator");
+
+#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
+static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. 1<= timeout <=15300, default="
+ __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/*
+ * Super-IO functions
+ */
+
+static inline void sch311x_sio_enter(int sio_config_port)
+{
+ outb(0x55, sio_config_port);
+}
+
+static inline void sch311x_sio_exit(int sio_config_port)
+{
+ outb(0xaa, sio_config_port);
+}
+
+static inline int sch311x_sio_inb(int sio_config_port, int reg)
+{
+ outb(reg, sio_config_port);
+ return inb(sio_config_port + 1);
+}
+
+static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
+{
+ outb(reg, sio_config_port);
+ outb(val, sio_config_port + 1);
+}
+
+/*
+ * Watchdog Operations
+ */
+
+static void sch311x_wdt_set_timeout(int t)
+{
+ unsigned char timeout_unit = 0x80;
+
+ /* When new timeout is bigger then 255 seconds, we will use minutes */
+ if (t > 255) {
+ timeout_unit = 0;
+ t /= 60;
+ }
+
+ /* -- Watchdog Timeout --
+ * Bit 0-6 (Reserved)
+ * Bit 7 WDT Time-out Value Units Select
+ * (0 = Minutes, 1 = Seconds)
+ */
+ outb(timeout_unit, sch311x_wdt_data.runtime_reg + WDT_TIME_OUT);
+
+ /* -- Watchdog Timer Time-out Value --
+ * Bit 0-7 Binary coded units (0=Disabled, 1..255)
+ */
+ outb(t, sch311x_wdt_data.runtime_reg + WDT_VAL);
+}
+
+static void sch311x_wdt_start(void)
+{
+ spin_lock(&sch311x_wdt_data.io_lock);
+
+ /* set watchdog's timeout */
+ sch311x_wdt_set_timeout(timeout);
+ /* enable the watchdog */
+ /* -- General Purpose I/O Bit 6.0 --
+ * Bit 0, In/Out: 0 = Output, 1 = Input
+ * Bit 1, Polarity: 0 = No Invert, 1 = Invert
+ * Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT,
+ * 10 = Either Edge Triggered Intr.4
+ * Bit 4-6 (Reserved)
+ * Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
+ */
+ outb(0x0e, sch311x_wdt_data.runtime_reg + GP60);
+
+ spin_unlock(&sch311x_wdt_data.io_lock);
+
+}
+
+static void sch311x_wdt_stop(void)
+{
+ spin_lock(&sch311x_wdt_data.io_lock);
+
+ /* stop the watchdog */
+ outb(0x01, sch311x_wdt_data.runtime_reg + GP60);
+ /* disable timeout by setting it to 0 */
+ sch311x_wdt_set_timeout(0);
+
+ spin_unlock(&sch311x_wdt_data.io_lock);
+}
+
+static void sch311x_wdt_keepalive(void)
+{
+ spin_lock(&sch311x_wdt_data.io_lock);
+ sch311x_wdt_set_timeout(timeout);
+ spin_unlock(&sch311x_wdt_data.io_lock);
+}
+
+static int sch311x_wdt_set_heartbeat(int t)
+{
+ if (t < 1 || t > (255*60))
+ return -EINVAL;
+
+ /* When new timeout is bigger then 255 seconds,
+ * we will round up to minutes (with a max of 255) */
+ if (t > 255)
+ t = (((t - 1) / 60) + 1) * 60;
+
+ timeout = t;
+ return 0;
+}
+
+static void sch311x_wdt_get_status(int *status)
+{
+ unsigned char new_status;
+
+ *status = 0;
+
+ spin_lock(&sch311x_wdt_data.io_lock);
+
+ /* -- Watchdog timer control --
+ * Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occured
+ * Bit 1 Reserved
+ * Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning)
+ * Bit 3 P20 Force Timeout enabled:
+ * 0 = P20 activity does not generate the WD timeout event
+ * 1 = P20 Allows rising edge of P20, from the keyboard
+ * controller, to force the WD timeout event.
+ * Bit 4-7 Reserved
+ */
+ new_status = inb(sch311x_wdt_data.runtime_reg + WDT_CTRL);
+ if (new_status & 0x01)
+ *status |= WDIOF_CARDRESET;
+
+ spin_unlock(&sch311x_wdt_data.io_lock);
+}
+
+/*
+ * /dev/watchdog handling
+ */
+
+static ssize_t sch311x_wdt_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ if (count) {
+ if (!nowayout) {
+ size_t i;
+
+ sch311x_wdt_expect_close = 0;
+
+ for (i = 0; i != count; i++) {
+ char c;
+ if (get_user(c, buf + i))
+ return -EFAULT;
+ if (c == 'V')
+ sch311x_wdt_expect_close = 42;
+ }
+ }
+ sch311x_wdt_keepalive();
+ }
+ return count;
+}
+
+static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int status;
+ int new_timeout;
+ void __user *argp = (void __user *)arg;
+ int __user *p = argp;
+ static struct watchdog_info ident = {
+ .options = WDIOF_KEEPALIVEPING |
+ WDIOF_SETTIMEOUT |
+ WDIOF_MAGICCLOSE,
+ .firmware_version = 1,
+ .identity = DRV_NAME,
+ };
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ if (copy_to_user(argp, &ident, sizeof(ident)))
+ return -EFAULT;
+ break;
+
+ case WDIOC_GETSTATUS:
+ {
+ sch311x_wdt_get_status(&status);
+ return put_user(status, p);
+ }
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(sch311x_wdt_data.boot_status, p);
+
+ case WDIOC_SETOPTIONS:
+ {
+ int options, retval = -EINVAL;
+
+ if (get_user(options, p))
+ return -EFAULT;
+ if (options & WDIOS_DISABLECARD) {
+ sch311x_wdt_stop();
+ retval = 0;
+ }
+ if (options & WDIOS_ENABLECARD) {
+ sch311x_wdt_start();
+ retval = 0;
+ }
+ return retval;
+ }
+ case WDIOC_KEEPALIVE:
+ sch311x_wdt_keepalive();
+ break;
+
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_timeout, p))
+ return -EFAULT;
+ if (sch311x_wdt_set_heartbeat(new_timeout))
+ return -EINVAL;
+ sch311x_wdt_keepalive();
+ /* Fall */
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout, p);
+ default:
+ return -ENOTTY;
+ }
+ return 0;
+}
+
+static int sch311x_wdt_open(struct inode *inode, struct file *file)
+{
+ if (test_and_set_bit(0, &sch311x_wdt_is_open))
+ return -EBUSY;
+ /*
+ * Activate
+ */
+ sch311x_wdt_start();
+ return nonseekable_open(inode, file);
+}
+
+static int sch311x_wdt_close(struct inode *inode, struct file *file)
+{
+ if (sch311x_wdt_expect_close == 42) {
+ sch311x_wdt_stop();
+ } else {
+ printk(KERN_CRIT PFX
+ "Unexpected close, not stopping watchdog!\n");
+ sch311x_wdt_keepalive();
+ }
+ clear_bit(0, &sch311x_wdt_is_open);
+ sch311x_wdt_expect_close = 0;
+ return 0;
+}
+
+/*
+ * Kernel Interfaces
+ */
+
+static const struct file_operations sch311x_wdt_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = sch311x_wdt_write,
+ .unlocked_ioctl = sch311x_wdt_ioctl,
+ .open = sch311x_wdt_open,
+ .release = sch311x_wdt_close,
+};
+
+static struct miscdevice sch311x_wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &sch311x_wdt_fops,
+};
+
+/*
+ * Init & exit routines
+ */
+
+static int __devinit sch311x_wdt_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ unsigned char val;
+ int err;
+
+ spin_lock_init(&sch311x_wdt_data.io_lock);
+
+ if (!request_region(sch311x_wdt_data.runtime_reg + RESGEN, 1,
+ DRV_NAME)) {
+ dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
+ sch311x_wdt_data.runtime_reg + RESGEN,
+ sch311x_wdt_data.runtime_reg + RESGEN);
+ err = -EBUSY;
+ goto exit;
+ }
+
+ if (!request_region(sch311x_wdt_data.runtime_reg + GP60, 1, DRV_NAME)) {
+ dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
+ sch311x_wdt_data.runtime_reg + GP60,
+ sch311x_wdt_data.runtime_reg + GP60);
+ err = -EBUSY;
+ goto exit_release_region;
+ }
+
+ if (!request_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4,
+ DRV_NAME)) {
+ dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
+ sch311x_wdt_data.runtime_reg + WDT_TIME_OUT,
+ sch311x_wdt_data.runtime_reg + WDT_CTRL);
+ err = -EBUSY;
+ goto exit_release_region2;
+ }
+
+ /* Make sure that the watchdog is not running */
+ sch311x_wdt_stop();
+
+ /* Disable keyboard and mouse interaction and interrupt */
+ /* -- Watchdog timer configuration --
+ * Bit 0 Reserved
+ * Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
+ * Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr
+ * Bit 3 Reserved
+ * Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
+ * 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
+ */
+ outb(0, sch311x_wdt_data.runtime_reg + WDT_CFG);
+
+ /* Check that the heartbeat value is within it's range ;
+ * if not reset to the default */
+ if (sch311x_wdt_set_heartbeat(timeout)) {
+ sch311x_wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+ dev_info(dev, "timeout value must be 1<=x<=15300, using %d\n",
+ timeout);
+ }
+
+ /* Get status at boot */
+ sch311x_wdt_get_status(&sch311x_wdt_data.boot_status);
+
+ /* enable watchdog */
+ /* -- Reset Generator --
+ * Bit 0 Enable Watchdog Timer Generation: 0* = Enabled, 1 = Disabled
+ * Bit 1 Thermtrip Source Select: O* = No Source, 1 = Source
+ * Bit 2 WDT2_CTL: WDT input bit
+ * Bit 3-7 Reserved
+ */
+ outb(0, sch311x_wdt_data.runtime_reg + RESGEN);
+ val = therm_trip ? 0x06 : 0x04;
+ outb(val, sch311x_wdt_data.runtime_reg + RESGEN);
+
+ err = misc_register(&sch311x_wdt_miscdev);
+ if (err != 0) {
+ dev_err(dev, "cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, err);
+ goto exit_release_region3;
+ }
+
+ sch311x_wdt_miscdev.parent = dev;
+
+ dev_info(dev,
+ "SMSC SCH311x WDT initialized. timeout=%d sec (nowayout=%d)\n",
+ timeout, nowayout);
+
+ return 0;
+
+exit_release_region3:
+ release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
+exit_release_region2:
+ release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
+exit_release_region:
+ release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1);
+ sch311x_wdt_data.runtime_reg = 0;
+exit:
+ return err;
+}
+
+static int __devexit sch311x_wdt_remove(struct platform_device *pdev)
+{
+ /* Stop the timer before we leave */
+ if (!nowayout)
+ sch311x_wdt_stop();
+
+ /* Deregister */
+ misc_deregister(&sch311x_wdt_miscdev);
+ release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
+ release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
+ release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1);
+ sch311x_wdt_data.runtime_reg = 0;
+ return 0;
+}
+
+static void sch311x_wdt_shutdown(struct platform_device *dev)
+{
+ /* Turn the WDT off if we have a soft shutdown */
+ sch311x_wdt_stop();
+}
+
+#define sch311x_wdt_suspend NULL
+#define sch311x_wdt_resume NULL
+
+static struct platform_driver sch311x_wdt_driver = {
+ .probe = sch311x_wdt_probe,
+ .remove = __devexit_p(sch311x_wdt_remove),
+ .shutdown = sch311x_wdt_shutdown,
+ .suspend = sch311x_wdt_suspend,
+ .resume = sch311x_wdt_resume,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRV_NAME,
+ },
+};
+
+static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
+{
+ int err = 0, reg;
+ unsigned short base_addr;
+ unsigned char dev_id;
+
+ sch311x_sio_enter(sio_config_port);
+
+ /* Check device ID. We currently know about:
+ * SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */
+ reg = force_id ? force_id : sch311x_sio_inb(sio_config_port, 0x20);
+ if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) {
+ err = -ENODEV;
+ goto exit;
+ }
+ dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6;
+
+ /* Select logical device A (runtime registers) */
+ sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
+
+ /* Check if Logical Device Register is currently active */
+ if (sch311x_sio_inb(sio_config_port, 0x30) && 0x01 == 0)
+ printk(KERN_INFO PFX "Seems that LDN 0x0a is not active...\n");
+
+ /* Get the base address of the runtime registers */
+ base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
+ sch311x_sio_inb(sio_config_port, 0x61);
+ if (!base_addr) {
+ printk(KERN_ERR PFX "Base address not set.\n");
+ err = -ENODEV;
+ goto exit;
+ }
+ *addr = base_addr;
+
+ printk(KERN_INFO PFX "Found an SMSC SCH311%d chip at 0x%04x\n",
+ dev_id, base_addr);
+
+exit:
+ sch311x_sio_exit(sio_config_port);
+ return err;
+}
+
+static int __init sch311x_wdt_init(void)
+{
+ int err, i, found = 0;
+ unsigned short addr = 0;
+
+ for (i = 0; !found && sch311x_ioports[i]; i++)
+ if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
+ found++;
+
+ if (!found)
+ return -ENODEV;
+
+ sch311x_wdt_data.runtime_reg = addr;
+
+ err = platform_driver_register(&sch311x_wdt_driver);
+ if (err)
+ return err;
+
+ sch311x_wdt_pdev = platform_device_register_simple(DRV_NAME, addr,
+ NULL, 0);
+
+ if (IS_ERR(sch311x_wdt_pdev)) {
+ err = PTR_ERR(sch311x_wdt_pdev);
+ goto unreg_platform_driver;
+ }
+
+ return 0;
+
+unreg_platform_driver:
+ platform_driver_unregister(&sch311x_wdt_driver);
+ return err;
+}
+
+static void __exit sch311x_wdt_exit(void)
+{
+ platform_device_unregister(sch311x_wdt_pdev);
+ platform_driver_unregister(&sch311x_wdt_driver);
+}
+
+module_init(sch311x_wdt_init);
+module_exit(sch311x_wdt_exit);
+
+MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
+MODULE_DESCRIPTION("SMSC SCH311x WatchDog Timer Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff