From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Add support for an RCLK watchdog found on RCar Gen3 based SoCs from
Renesas.
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
.../devicetree/bindings/watchdog/renesas-rwdt.txt | 20 ++
drivers/watchdog/Kconfig | 8 +
drivers/watchdog/Makefile | 1 +
drivers/watchdog/renesas_rwdt.c | 213 +++++++++++++++++++++
4 files changed, 242 insertions(+)
create mode 100644 Documentation/devicetree/bindings/watchdog/renesas-rwdt.txt
create mode 100644 drivers/watchdog/renesas_rwdt.c
diff --git a/Documentation/devicetree/bindings/watchdog/renesas-rwdt.txt b/Documentation/devicetree/bindings/watchdog/renesas-rwdt.txt
new file mode 100644
index 00000000000000..9bb59f1237767c
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/renesas-rwdt.txt
@@ -0,0 +1,20 @@
+Renesas RCLK Watchdog Timer (RWDT) Controller
+
+Required properties:
+- compatible : Should be "renesas,r8a7795-rwdt", or "renesas,rcar-gen3-rwdt"
+- reg : Should contain WDT registers location and length
+- clocks : the clock feeding the watchdog timer.
+
+Optional properties:
+- timeout-sec : Contains the watchdog timeout in seconds
+- power-domains : the power domain the RWDT belongs to
+
+Examples:
+
+ wdt0: wdt@e6020000 {
+ compatible = "renesas,rwdt-r8a7795";
+ reg = <0 0xe6020000 0 0x0c>;
+ clocks = <&cpg CPG_MOD 402>;
+ power-domains = <&cpg>;
+ timeout-sec = <60>;
+ };
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 86c2392bd9684f..e547e83ba83d36 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -638,6 +638,14 @@ config ATLAS7_WATCHDOG
To compile this driver as a module, choose M here: the
module will be called atlas7_wdt.
+config RENESAS_RWDT
+ tristate "Renesas RWDT Watchdog"
+ depends on ARCH_RENESAS || COMPILE_TEST
+ select WATCHDOG_CORE
+ help
+ This driver adds watchdog support for the integrated watchdog in the
+ Renesas R-Car and other SH-Mobile SoCs.
+
# AVR32 Architecture
config AT32AP700X_WDT
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index efc4f788e0f29c..f2f55b7a75ba1e 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_DIGICOLOR_WATCHDOG) += digicolor_wdt.o
obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o
obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o
obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o
+obj-$(CONFIG_RENESAS_RWDT) += renesas_rwdt.o
# AVR32 Architecture
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
diff --git a/drivers/watchdog/renesas_rwdt.c b/drivers/watchdog/renesas_rwdt.c
new file mode 100644
index 00000000000000..71dc2b29ad9316
--- /dev/null
+++ b/drivers/watchdog/renesas_rwdt.c
@@ -0,0 +1,213 @@
+/*
+ * Watchdog driver for Renesas RWDT watchdog
+ *
+ * Copyright (C) 2015-16 Wolfram Sang, Sang Engineering <wsa@xxxxxxxxxxxxxxxxxxxx>
+ * Copyright (C) 2015-16 Renesas Electronics Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/watchdog.h>
+
+#define RWTCNT 0
+#define RWTCSRA 4
+#define RWTCSRA_WOVF BIT(4)
+#define RWTCSRA_WRFLG BIT(5)
+#define RWTCSRA_TME BIT(7)
+
+#define RWDT_DEFAULT_TIMEOUT 60U
+
+static const unsigned clk_divs[] = { 1, 4, 16, 32, 64, 128, 1024 };
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, S_IRUGO);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+struct rwdt_priv {
+ void __iomem *base;
+ struct watchdog_device wdev;
+ struct clk *clk;
+ unsigned clks_per_sec;
+ u8 cks;
+};
+
+static void rwdt_write(struct rwdt_priv *priv, u32 val, unsigned reg)
+{
+ if (reg == RWTCNT)
+ val |= 0x5a5a0000;
+ else
+ val |= 0xa5a5a500;
+
+ writel_relaxed(val, priv->base + reg);
+}
+
+static int rwdt_init_timeout(struct watchdog_device *wdev)
+{
+ struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
+
+ rwdt_write(priv, 65536 - wdev->timeout * priv->clks_per_sec, RWTCNT);
+
+ return 0;
+}
+
+static int rwdt_set_timeout(struct watchdog_device *wdev, unsigned new_timeout)
+{
+ wdev->timeout = new_timeout;
+ rwdt_init_timeout(wdev);
+
+ return 0;
+}
+
+static int rwdt_start(struct watchdog_device *wdev)
+{
+ struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
+
+ clk_prepare_enable(priv->clk);
+
+ rwdt_write(priv, priv->cks, RWTCSRA);
+ rwdt_init_timeout(wdev);
+
+ while (readb_relaxed(priv->base + RWTCSRA) & RWTCSRA_WRFLG)
+ cpu_relax();
+
+ rwdt_write(priv, priv->cks | RWTCSRA_TME, RWTCSRA);
+
+ return 0;
+}
+
+static int rwdt_stop(struct watchdog_device *wdev)
+{
+ struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
+
+ rwdt_write(priv, priv->cks, RWTCSRA);
+ clk_disable_unprepare(priv->clk);
+
+ return 0;
+}
+
+static const struct watchdog_info rwdt_ident = {
+ .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
+ .identity = "Renesas RWDT Watchdog",
+};
+
+static const struct watchdog_ops rwdt_ops = {
+ .owner = THIS_MODULE,
+ .start = rwdt_start,
+ .stop = rwdt_stop,
+ .ping = rwdt_init_timeout,
+ .set_timeout = rwdt_set_timeout,
+};
+
+static int rwdt_probe(struct platform_device *pdev)
+{
+ struct rwdt_priv *priv;
+ struct resource *res;
+ unsigned long rate;
+ unsigned clks_per_sec;
+ int ret, i;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ priv->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(priv->clk))
+ return PTR_ERR(priv->clk);
+
+ rate = clk_get_rate(priv->clk);
+ if (!rate)
+ return -ENOENT;
+
+ for (i = ARRAY_SIZE(clk_divs); i >= 0; i--) {
+ clks_per_sec = DIV_ROUND_UP(rate, clk_divs[i]);
+ if (clks_per_sec) {
+ priv->clks_per_sec = clks_per_sec;
+ priv->cks = i;
+ break;
+ }
+ }
+
+ if (!clks_per_sec) {
+ dev_err(&pdev->dev, "Can't find suitable clock divider!\n");
+ return -ERANGE;
+ }
+
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
+ priv->wdev.info = &rwdt_ident,
+ priv->wdev.ops = &rwdt_ops,
+ priv->wdev.parent = &pdev->dev;
+ priv->wdev.min_timeout = 1;
+ priv->wdev.max_timeout = 65536 / clks_per_sec;
+ priv->wdev.timeout = min(priv->wdev.max_timeout, RWDT_DEFAULT_TIMEOUT);
+
+ platform_set_drvdata(pdev, priv);
+ watchdog_set_drvdata(&priv->wdev, priv);
+ watchdog_set_nowayout(&priv->wdev, nowayout);
+
+ /* This overrides the default timeout only if DT configuration was found */
+ ret = watchdog_init_timeout(&priv->wdev, 0, &pdev->dev);
+ if (ret)
+ dev_warn(&pdev->dev, "Specified timeout value invalid, using default\n");
+
+ ret = watchdog_register_device(&priv->wdev);
+ if (ret < 0) {
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int rwdt_remove(struct platform_device *pdev)
+{
+ struct rwdt_priv *priv = platform_get_drvdata(pdev);
+
+ watchdog_unregister_device(&priv->wdev);
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+/*
+ * This driver does also fit for R-Car Gen2 (r8a779[0-4]) RWDT. However, for SMP
+ * to work there, one also needs a RESET (RST) driver which does not exist yet
+ * due to HW issues. This needs to be solved before adding compatibles here.
+ */
+static const struct of_device_id rwdt_ids[] = {
+ { .compatible = "renesas,r8a7795-rwdt", },
+ { .compatible = "renesas,rcar-gen3-rwdt", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rwdt_ids);
+
+static struct platform_driver rwdt_driver = {
+ .driver = {
+ .name = "renesas_rwdt",
+ .of_match_table = rwdt_ids,
+ },
+ .probe = rwdt_probe,
+ .remove = rwdt_remove,
+};
+module_platform_driver(rwdt_driver);
+
+MODULE_DESCRIPTION("Renesas RWDT Watchdog Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Wolfram Sang <wsa@xxxxxxxxxxxxxxxxxxxx>");
--
2.7.0
