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Message-ID: <1478671461-25135-3-git-send-email-fixed-term.Oleksij.Rempel@de.bosch.com>
Date: Wed, 9 Nov 2016 07:04:20 +0100
From: <fixed-term.Oleksij.Rempel@...bosch.com>
To: <linux-kernel@...r.kernel.org>, <linux-soc@...r.kernel.org>,
<dirk.behme@...bosch.com>, <mkl@...gutronix.de>
CC: Oleksij Rempel <fixed-term.Oleksij.Rempel@...bosch.com>,
Oleksij Rempel <linux@...pel-privat.de>
Subject: [RFC 2/3] watchdog: add icc watchdog driver
From: Oleksij Rempel <fixed-term.Oleksij.Rempel@...bosch.com>
this driver is needed to ping over ICC bus a watchdog.
Signed-off-by: Oleksij Rempel <linux@...pel-privat.de>
Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel@...bosch.com>
---
drivers/watchdog/Kconfig | 8 ++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/icc_wdt.c | 185 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 194 insertions(+)
create mode 100644 drivers/watchdog/icc_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 16f2023..7e52835 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -104,6 +104,14 @@ config GPIO_WATCHDOG
If you say yes here you get support for watchdog device
controlled through GPIO-line.
+config ICC_WATCHDOG
+ tristate "ICC watchdog"
+ depends on ICC
+ select WATCHDOG_CORE
+ help
+ If you say yes here you get support for watchdog device
+ controlled through ICC bus.
+
config MENF21BMC_WATCHDOG
tristate "MEN 14F021P00 BMC Watchdog"
depends on MFD_MENF21BMC
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 5c19294..40451cc 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -181,6 +181,7 @@ obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
obj-$(CONFIG_DA9063_WATCHDOG) += da9063_wdt.o
obj-$(CONFIG_GPIO_WATCHDOG) += gpio_wdt.o
+obj-$(CONFIG_ICC_WATCHDOG) += icc_wdt.o
obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
diff --git a/drivers/watchdog/icc_wdt.c b/drivers/watchdog/icc_wdt.c
new file mode 100644
index 0000000..a89dc15
--- /dev/null
+++ b/drivers/watchdog/icc_wdt.c
@@ -0,0 +1,185 @@
+/*
+ * Driver for RBCM INC Gen3 Watchdog.
+ * RBCM - Robert Bosch Car Multimedia GmbH
+ * INC - Inter node communication.
+ * Gen3 - Generation 3 products.
+ * Short: rig3 :)
+ *
+ * Copyright (C) Robert Bosch Car Multimedia GmbH
+ * Authors:
+ * Oleksij Rempel
+ * <fixed-term.Oleksij.Rempel@...bosch.com>
+ * <linux@...pel-privat.de>
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/reset.h>
+#include <linux/watchdog.h>
+#include <linux/icc/icc.h>
+
+struct icc_wdt_priv {
+ struct device *dev;
+ struct icc_device *iccd;
+ struct watchdog_device wdd;
+
+ struct icc_trf trf;
+ bool check_pong;
+ atomic_t pong;
+};
+
+static int icc_wdt_feed(struct watchdog_device *wdd)
+{
+ struct icc_wdt_priv *priv = watchdog_get_drvdata(wdd);
+ struct icc_device *iccd = priv->iccd;
+
+ if (priv->check_pong && atomic_read(&priv->pong))
+ dev_warn_ratelimited(priv->dev, "making ping without getting pong\n");
+
+ atomic_set(&priv->pong, 1);
+
+ return icc_trf_xmit(iccd->iccm, &priv->trf);
+}
+
+static int icc_wdt_enable(struct watchdog_device *wdd)
+{
+ return 0;
+}
+
+static int icc_wdt_stop(struct watchdog_device *wdd)
+{
+ return 0;
+}
+
+static const struct watchdog_info icc_wdt_ident = {
+ .identity = "RBCM, Inc Gen3 WatchDog",
+};
+
+static struct watchdog_ops icc_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = icc_wdt_enable,
+ .stop = icc_wdt_stop,
+ .ping = icc_wdt_feed,
+};
+
+static int icc_wdt_rx_cb(struct icc_device *iccd, void *rx_buf, size_t size)
+{
+ struct icc_wdt_priv *priv = icc_get_drvdata(iccd);
+
+ atomic_set(&priv->pong, 0);
+
+ return 0;
+}
+
+static int icc_wdt_int_trf(struct icc_wdt_priv *priv)
+{
+ struct icc_device *iccd = priv->iccd;
+ struct icc_trf *trf = &priv->trf;
+
+ u8 *buf;
+ int ret;
+
+ ret = icc_trf_alloc(iccd->iccm, trf, 9, 1);
+ if (ret)
+ return ret;
+
+ buf = trf->data;
+ buf[0] = 0x62;
+
+ return 0;
+}
+
+static int icc_wdt_probe(struct icc_device *iccd)
+{
+ struct device *dev = &iccd->dev;
+ struct icc_wdt_priv *priv;
+ struct watchdog_device *wdd;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(struct icc_wdt_priv),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = dev;
+ priv->iccd = iccd;
+
+ wdd = &priv->wdd;
+ wdd->info = &icc_wdt_ident;
+ wdd->ops = &icc_wdt_ops;
+ wdd->min_timeout = 1;
+ wdd->max_timeout = 10;
+ wdd->parent = dev;
+
+ icc_set_drvdata(iccd, priv);
+ icc_set_rxcb(iccd, icc_wdt_rx_cb);
+ watchdog_set_drvdata(wdd, priv);
+
+ /*
+ * If 'timeout-sec' unspecified in devicetree, assume a 30 second
+ * default, unless the max timeout is less than 30 seconds, then use
+ * the max instead.
+ */
+ watchdog_init_timeout(wdd, 10, dev);
+
+ ret = watchdog_register_device(wdd);
+ if (ret)
+ return ret;
+
+ ret = icc_wdt_int_trf(priv);
+ if (ret)
+ return ret;
+
+ dev_info(dev, "Watchdog enabled\n");
+ return 0;
+}
+
+static int icc_wdt_remove(struct icc_device *iccd)
+{
+ struct icc_wdt_priv *priv = icc_get_drvdata(iccd);
+
+ watchdog_unregister_device(&priv->wdd);
+
+ return 0;
+}
+
+static const struct of_device_id icc_wdt_of_match[] = {
+ { .compatible = "rbcm,inc-wdt-gen3" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, icc_wdt_of_match);
+
+static struct icc_driver icc_wdt_driver = {
+ .driver = {
+ .name = "inc-wdt-gen3",
+ .owner = THIS_MODULE,
+ .of_match_table = icc_wdt_of_match,
+ },
+ .probe = icc_wdt_probe,
+ .remove = icc_wdt_remove,
+};
+
+static int __init icc_wdt_init(void)
+{
+ return icc_register_driver(&icc_wdt_driver);
+}
+module_init(icc_wdt_init);
+
+static void __exit icc_wdt_exit(void)
+{
+ icc_unregister_driver(&icc_wdt_driver);
+}
+module_exit(icc_wdt_exit);
+
+MODULE_DESCRIPTION("ICC WatchDog Driver");
+MODULE_AUTHOR("Oleksij Rempel <fixed-term.Oleksij.Rempel@...bosch.com>");
+MODULE_LICENSE("GPL");
--
1.9.1
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