watchdog: add Intel MID watchdog driver support

Add initial Intel MID watchdog driver support.

This driver is an initial implementation of generic Intel MID watchdog
driver. Currently it supports Intel Merrifield platform.

Signed-off-by: Eric Ernst <eric.ernst@intel.com>
Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 184 insertions, 0 deletions

diff --git a/drivers/watchdog/intel-mid_wdt.c b/drivers/watchdog/intel-mid_wdt.c
new file mode 100644
index 000000000000..ca66e8e74635
--- /dev/null
+++ b/drivers/watchdog/intel-mid_wdt.c
@@ -0,0 +1,184 @@
+/*
+ *      intel-mid_wdt: generic Intel MID SCU watchdog driver
+ *
+ *      Platforms supported so far:
+ *      - Merrifield only
+ *
+ *      Copyright (C) 2014 Intel Corporation. All rights reserved.
+ *      Contact: David Cohen <david.a.cohen@linux.intel.com>
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of version 2 of the GNU General
+ *      Public License as published by the Free Software Foundation.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/nmi.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/platform_data/intel-mid_wdt.h>
+
+#include <asm/intel_scu_ipc.h>
+#include <asm/intel-mid.h>
+
+#define IPC_WATCHDOG 0xf8
+
+#define MID_WDT_PRETIMEOUT              15
+#define MID_WDT_TIMEOUT_MIN             (1 + MID_WDT_PRETIMEOUT)
+#define MID_WDT_TIMEOUT_MAX             170
+#define MID_WDT_DEFAULT_TIMEOUT         90
+
+/* SCU watchdog messages */
+enum {
+        SCU_WATCHDOG_START = 0,
+        SCU_WATCHDOG_STOP,
+        SCU_WATCHDOG_KEEPALIVE,
+};
+
+static inline int wdt_command(int sub, u32 *in, int inlen)
+{
+        return intel_scu_ipc_command(IPC_WATCHDOG, sub, in, inlen, NULL, 0);
+}
+
+static int wdt_start(struct watchdog_device *wd)
+{
+        int ret, in_size;
+        int timeout = wd->timeout;
+        struct ipc_wd_start {
+                u32 pretimeout;
+                u32 timeout;
+        } ipc_wd_start = { timeout - MID_WDT_PRETIMEOUT, timeout };
+
+        /*
+         * SCU expects the input size for watchdog IPC to
+         * be based on 4 bytes
+         */
+        in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4);
+
+        ret = wdt_command(SCU_WATCHDOG_START, (u32 *)&ipc_wd_start, in_size);
+        if (ret) {
+                struct device *dev = watchdog_get_drvdata(wd);
+                dev_crit(dev, "error starting watchdog: %d\n", ret);
+        }
+
+        return ret;
+}
+
+static int wdt_ping(struct watchdog_device *wd)
+{
+        int ret;
+
+        ret = wdt_command(SCU_WATCHDOG_KEEPALIVE, NULL, 0);
+        if (ret) {
+                struct device *dev = watchdog_get_drvdata(wd);
+                dev_crit(dev, "Error executing keepalive: 0x%x\n", ret);
+        }
+
+        return ret;
+}
+
+static int wdt_stop(struct watchdog_device *wd)
+{
+        int ret;
+
+        ret = wdt_command(SCU_WATCHDOG_STOP, NULL, 0);
+        if (ret) {
+                struct device *dev = watchdog_get_drvdata(wd);
+                dev_crit(dev, "Error stopping watchdog: 0x%x\n", ret);
+        }
+
+        return ret;
+}
+
+static irqreturn_t mid_wdt_irq(int irq, void *dev_id)
+{
+        panic("Kernel Watchdog");
+
+        /* This code should not be reached */
+        return IRQ_HANDLED;
+}
+
+static const struct watchdog_info mid_wdt_info = {
+        .identity = "Intel MID SCU watchdog",
+        .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
+};
+
+static const struct watchdog_ops mid_wdt_ops = {
+        .owner = THIS_MODULE,
+        .start = wdt_start,
+        .stop = wdt_stop,
+        .ping = wdt_ping,
+};
+
+static int mid_wdt_probe(struct platform_device *pdev)
+{
+        struct watchdog_device *wdt_dev;
+        struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data;
+        int ret;
+
+        if (!pdata) {
+                dev_err(&pdev->dev, "missing platform data\n");
+                return -EINVAL;
+        }
+
+        if (pdata->probe) {
+                ret = pdata->probe(pdev);
+                if (ret)
+                        return ret;
+        }
+
+        wdt_dev = devm_kzalloc(&pdev->dev, sizeof(*wdt_dev), GFP_KERNEL);
+        if (!wdt_dev)
+                return -ENOMEM;
+
+        wdt_dev->info = &mid_wdt_info;
+        wdt_dev->ops = &mid_wdt_ops;
+        wdt_dev->min_timeout = MID_WDT_TIMEOUT_MIN;
+        wdt_dev->max_timeout = MID_WDT_TIMEOUT_MAX;
+        wdt_dev->timeout = MID_WDT_DEFAULT_TIMEOUT;
+
+        watchdog_set_drvdata(wdt_dev, &pdev->dev);
+        platform_set_drvdata(pdev, wdt_dev);
+
+        ret = devm_request_irq(&pdev->dev, pdata->irq, mid_wdt_irq,
+                               IRQF_SHARED | IRQF_NO_SUSPEND, "watchdog",
+                               wdt_dev);
+        if (ret) {
+                dev_err(&pdev->dev, "error requesting warning irq %d\n",
+                        pdata->irq);
+                return ret;
+        }
+
+        ret = watchdog_register_device(wdt_dev);
+        if (ret) {
+                dev_err(&pdev->dev, "error registering watchdog device\n");
+                return ret;
+        }
+
+        dev_info(&pdev->dev, "Intel MID watchdog device probed\n");
+
+        return 0;
+}
+
+static int mid_wdt_remove(struct platform_device *pdev)
+{
+        struct watchdog_device *wd = platform_get_drvdata(pdev);
+        watchdog_unregister_device(wd);
+        return 0;
+}
+
+static struct platform_driver mid_wdt_driver = {
+        .probe          = mid_wdt_probe,
+        .remove         = mid_wdt_remove,
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = "intel_mid_wdt",
+        },
+};
+
+module_platform_driver(mid_wdt_driver);
+
+MODULE_AUTHOR("David Cohen <david.a.cohen@linux.intel.com>");
+MODULE_DESCRIPTION("Watchdog Driver for Intel MID platform");
+MODULE_LICENSE("GPL");