411 lines
10 KiB
Diff
411 lines
10 KiB
Diff
--- /dev/null
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+++ b/drivers/watchdog/gemini_wdt.c
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@@ -0,0 +1,378 @@
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+/*
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+ * Watchdog driver for Cortina Systems Gemini SoC
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+ *
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+ * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/io.h>
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+#include <linux/fs.h>
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+#include <linux/uaccess.h>
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+#include <linux/miscdevice.h>
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+#include <linux/platform_device.h>
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+#include <linux/watchdog.h>
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+#include <linux/slab.h>
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+
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+#define GEMINI_WDCOUNTER 0x0
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+#define GEMINI_WDLOAD 0x4
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+#define GEMINI_WDRESTART 0x8
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+
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+#define WDRESTART_MAGIC 0x5AB9
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+
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+#define GEMINI_WDCR 0xC
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+
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+#define WDCR_CLOCK_5MHZ (1 << 4)
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+#define WDCR_SYS_RST (1 << 1)
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+#define WDCR_ENABLE (1 << 0)
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+
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+#define WDT_CLOCK 5000000 /* 5 MHz */
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+#define WDT_DEFAULT_TIMEOUT 13
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+#define WDT_MAX_TIMEOUT (0xFFFFFFFF / WDT_CLOCK)
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+
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+/* status bits */
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+#define WDT_ACTIVE 0
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+#define WDT_OK_TO_CLOSE 1
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+
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+static unsigned int timeout = WDT_DEFAULT_TIMEOUT;
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+static int nowayout = WATCHDOG_NOWAYOUT;
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+
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+static DEFINE_SPINLOCK(gemini_wdt_lock);
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+
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+static struct platform_device *gemini_wdt_dev;
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+
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+struct gemini_wdt_struct {
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+ struct resource *res;
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+ struct device *dev;
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+ void __iomem *base;
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+ unsigned long status;
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+};
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+
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+static struct watchdog_info gemini_wdt_info = {
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+ .identity = "Gemini watchdog",
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+ .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
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+ WDIOF_SETTIMEOUT,
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+};
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+
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+/* Disable the watchdog. */
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+static void gemini_wdt_stop(struct gemini_wdt_struct *gemini_wdt)
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+{
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+ spin_lock(&gemini_wdt_lock);
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+
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+ __raw_writel(0, gemini_wdt->base + GEMINI_WDCR);
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+
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+ clear_bit(WDT_ACTIVE, &gemini_wdt->status);
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+
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+ spin_unlock(&gemini_wdt_lock);
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+}
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+
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+/* Service the watchdog */
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+static void gemini_wdt_service(struct gemini_wdt_struct *gemini_wdt)
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+{
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+ __raw_writel(WDRESTART_MAGIC, gemini_wdt->base + GEMINI_WDRESTART);
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+}
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+
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+/* Enable and reset the watchdog. */
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+static void gemini_wdt_start(struct gemini_wdt_struct *gemini_wdt)
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+{
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+ spin_lock(&gemini_wdt_lock);
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+
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+ __raw_writel(timeout * WDT_CLOCK, gemini_wdt->base + GEMINI_WDLOAD);
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+
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+ gemini_wdt_service(gemini_wdt);
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+
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+ /* set clock before enabling */
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+ __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST,
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+ gemini_wdt->base + GEMINI_WDCR);
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+
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+ __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST | WDCR_ENABLE,
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+ gemini_wdt->base + GEMINI_WDCR);
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+
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+ set_bit(WDT_ACTIVE, &gemini_wdt->status);
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+
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+ spin_unlock(&gemini_wdt_lock);
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+}
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+
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+/* Watchdog device is opened, and watchdog starts running. */
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+static int gemini_wdt_open(struct inode *inode, struct file *file)
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+{
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+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(gemini_wdt_dev);
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+
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+ if (test_bit(WDT_ACTIVE, &gemini_wdt->status))
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+ return -EBUSY;
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+
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+ file->private_data = gemini_wdt;
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+
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+ gemini_wdt_start(gemini_wdt);
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+
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+ return nonseekable_open(inode, file);
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+}
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+
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+/* Close the watchdog device. */
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+static int gemini_wdt_close(struct inode *inode, struct file *file)
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+{
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+ struct gemini_wdt_struct *gemini_wdt = file->private_data;
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+
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+ /* Disable the watchdog if possible */
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+ if (test_bit(WDT_OK_TO_CLOSE, &gemini_wdt->status))
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+ gemini_wdt_stop(gemini_wdt);
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+ else
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+ dev_warn(gemini_wdt->dev, "Device closed unexpectedly - timer will not stop\n");
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+
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+ return 0;
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+}
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+
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+/* Handle commands from user-space. */
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+static long gemini_wdt_ioctl(struct file *file, unsigned int cmd,
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+ unsigned long arg)
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+{
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+ struct gemini_wdt_struct *gemini_wdt = file->private_data;
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+
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+ int value;
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+
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+ switch (cmd) {
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+ case WDIOC_KEEPALIVE:
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+ gemini_wdt_service(gemini_wdt);
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+ return 0;
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+
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+ case WDIOC_GETSUPPORT:
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+ return copy_to_user((struct watchdog_info *)arg, &gemini_wdt_info,
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+ sizeof(gemini_wdt_info)) ? -EFAULT : 0;
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+
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+ case WDIOC_SETTIMEOUT:
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+ if (get_user(value, (int *)arg))
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+ return -EFAULT;
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+
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+ if ((value < 1) || (value > WDT_MAX_TIMEOUT))
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+ return -EINVAL;
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+
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+ timeout = value;
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+
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+ /* restart wdt to use new timeout */
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+ gemini_wdt_stop(gemini_wdt);
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+ gemini_wdt_start(gemini_wdt);
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+
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+ /* Fall through */
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+ case WDIOC_GETTIMEOUT:
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+ return put_user(timeout, (int *)arg);
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+
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+ case WDIOC_GETTIMELEFT:
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+ value = __raw_readl(gemini_wdt->base + GEMINI_WDCOUNTER);
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+ return put_user(value / WDT_CLOCK, (int *)arg);
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+
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+ default:
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+ return -ENOTTY;
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+ }
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+}
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+
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+/* Refresh the watchdog whenever device is written to. */
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+static ssize_t gemini_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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+ struct gemini_wdt_struct *gemini_wdt = file->private_data;
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+
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+ if (len) {
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+ if (!nowayout) {
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+ size_t i;
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+
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+ clear_bit(WDT_OK_TO_CLOSE, &gemini_wdt->status);
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+ for (i = 0; i != len; i++) {
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+ char c;
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+
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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,
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+ &gemini_wdt->status);
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+ }
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+ }
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+ gemini_wdt_service(gemini_wdt);
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+ }
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+
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+ return len;
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+}
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+
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+static const struct file_operations gemini_wdt_fops = {
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+ .owner = THIS_MODULE,
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+ .llseek = no_llseek,
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+ .unlocked_ioctl = gemini_wdt_ioctl,
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+ .open = gemini_wdt_open,
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+ .release = gemini_wdt_close,
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+ .write = gemini_wdt_write,
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+};
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+
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+static struct miscdevice gemini_wdt_miscdev = {
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+ .minor = WATCHDOG_MINOR,
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+ .name = "watchdog",
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+ .fops = &gemini_wdt_fops,
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+};
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+
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+static void gemini_wdt_shutdown(struct platform_device *pdev)
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+{
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+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
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+
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+ gemini_wdt_stop(gemini_wdt);
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+}
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+
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+static int gemini_wdt_probe(struct platform_device *pdev)
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+{
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+ int ret;
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+ int res_size;
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+ struct resource *res;
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+ void __iomem *base;
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+ struct gemini_wdt_struct *gemini_wdt;
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+ unsigned int reg;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!res) {
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+ dev_err(&pdev->dev, "can't get device resources\n");
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+ return -ENODEV;
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+ }
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+
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+ res_size = resource_size(res);
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+ if (!request_mem_region(res->start, res_size, res->name)) {
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+ dev_err(&pdev->dev, "can't allocate %d bytes at %d address\n",
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+ res_size, res->start);
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+ return -ENOMEM;
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+ }
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+
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+ base = ioremap(res->start, res_size);
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+ if (!base) {
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+ dev_err(&pdev->dev, "ioremap failed\n");
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+ ret = -EIO;
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+ goto fail0;
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+ }
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+
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+ gemini_wdt = kzalloc(sizeof(struct gemini_wdt_struct), GFP_KERNEL);
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+ if (!gemini_wdt) {
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+ dev_err(&pdev->dev, "can't allocate interface\n");
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+ ret = -ENOMEM;
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+ goto fail1;
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+ }
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+
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+ /* Setup gemini_wdt driver structure */
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+ gemini_wdt->base = base;
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+ gemini_wdt->res = res;
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+
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+ /* Set up platform driver data */
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+ platform_set_drvdata(pdev, gemini_wdt);
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+ gemini_wdt_dev = pdev;
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+
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+ if (gemini_wdt_miscdev.parent) {
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+ ret = -EBUSY;
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+ goto fail2;
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+ }
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+
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+ gemini_wdt_miscdev.parent = &pdev->dev;
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+
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+ reg = __raw_readw(gemini_wdt->base + GEMINI_WDCR);
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+ if (reg & WDCR_ENABLE) {
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+ /* Watchdog was enabled by the bootloader, disable it. */
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+ reg &= ~(WDCR_ENABLE);
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+ __raw_writel(reg, gemini_wdt->base + GEMINI_WDCR);
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+ }
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+
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+ ret = misc_register(&gemini_wdt_miscdev);
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+ if (ret)
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+ goto fail2;
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+
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+ return 0;
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+
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+fail2:
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+ platform_set_drvdata(pdev, NULL);
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+ kfree(gemini_wdt);
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+fail1:
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+ iounmap(base);
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+fail0:
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+ release_mem_region(res->start, res_size);
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+
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+ return ret;
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+}
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+
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+static int gemini_wdt_remove(struct platform_device *pdev)
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+{
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+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
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+
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+ platform_set_drvdata(pdev, NULL);
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+ misc_deregister(&gemini_wdt_miscdev);
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+ gemini_wdt_dev = NULL;
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+ iounmap(gemini_wdt->base);
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+ release_mem_region(gemini_wdt->res->start, resource_size(gemini_wdt->res));
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+
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+ kfree(gemini_wdt);
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+
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+ return 0;
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+}
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+
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+#ifdef CONFIG_PM
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+static int gemini_wdt_suspend(struct platform_device *pdev, pm_message_t message)
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+{
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+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
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+ unsigned int reg;
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+
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+ reg = __raw_readw(gemini_wdt->base + GEMINI_WDCR);
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+ reg &= ~(WDCR_WDENABLE);
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+ __raw_writel(reg, gemini_wdt->base + GEMINI_WDCR);
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+
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+ return 0;
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+}
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+
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+static int gemini_wdt_resume(struct platform_device *pdev)
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+{
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+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
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+ unsigned int reg;
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+
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+ if (gemini_wdt->status) {
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+ reg = __raw_readw(gemini_wdt->base + GEMINI_WDCR);
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+ reg |= WDCR_WDENABLE;
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+ __raw_writel(reg, gemini_wdt->base + GEMINI_WDCR);
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+ }
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+
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+ return 0;
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+}
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+#else
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+#define gemini_wdt_suspend NULL
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+#define gemini_wdt_resume NULL
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+#endif
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+
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+static struct platform_driver gemini_wdt_driver = {
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+ .probe = gemini_wdt_probe,
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+ .remove = gemini_wdt_remove,
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+ .shutdown = gemini_wdt_shutdown,
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+ .suspend = gemini_wdt_suspend,
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+ .resume = gemini_wdt_resume,
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+ .driver = {
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+ .name = "gemini-wdt",
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int __init gemini_wdt_init(void)
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+{
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+ return platform_driver_probe(&gemini_wdt_driver, gemini_wdt_probe);
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+}
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+
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+static void __exit gemini_wdt_exit(void)
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+{
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+ platform_driver_unregister(&gemini_wdt_driver);
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+}
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+
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+module_init(gemini_wdt_init);
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+module_exit(gemini_wdt_exit);
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+
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+module_param(timeout, uint, 0);
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+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
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+
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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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+
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+MODULE_AUTHOR("Paulius Zaleckas");
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+MODULE_DESCRIPTION("Watchdog driver for Gemini");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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+MODULE_ALIAS("platform:gemini-wdt");
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -154,6 +154,16 @@ config 977_WATCHDOG
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Not sure? It's safe to say N.
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+config GEMINI_WATCHDOG
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+ tristate "Gemini watchdog"
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+ depends on ARCH_GEMINI
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+ help
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+ Say Y here if to include support for the watchdog timer
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+ embedded in the Cortina Systems Gemini family of devices.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called gemini_wdt.
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+
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config IXP4XX_WATCHDOG
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tristate "IXP4xx Watchdog"
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depends on ARCH_IXP4XX
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--- a/drivers/watchdog/Makefile
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+++ b/drivers/watchdog/Makefile
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@@ -36,6 +36,7 @@ obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.
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obj-$(CONFIG_TWL4030_WATCHDOG) += twl4030_wdt.o
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obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
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obj-$(CONFIG_977_WATCHDOG) += wdt977.o
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+obj-$(CONFIG_GEMINI_WATCHDOG) += gemini_wdt.o
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obj-$(CONFIG_IXP4XX_WATCHDOG) += ixp4xx_wdt.o
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obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o
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obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
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