watchdog: renesas-wdt: add driver

Add support for watchdogs (RWDT and SWDT) found on RCar Gen3 based SoCs
from Renesas.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

4 files changed, 247 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt b/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
new file mode 100644
index 000000000000..b9512f1eb80a
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt
@@ -0,0 +1,25 @@
+Renesas Watchdog Timer (WDT) Controller
+
+Required properties:
+- compatible : Should be "renesas,r8a7795-wdt", or "renesas,rcar-gen3-wdt"
+
+  When compatible with the generic version, nodes must list the SoC-specific
+  version corresponding to the platform first, followed by the generic
+  version.
+
+- 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 WDT belongs to
+
+Examples:
+
+        wdt0: watchdog@e6020000 {
+                compatible = "renesas,r8a7795-wdt", "renesas,rcar-gen3-wdt";
+                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 fb947655badd..3902c9ca7f09 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -661,6 +661,14 @@ config ATLAS7_WATCHDOG
           To compile this driver as a module, choose M here: the
           module will be called atlas7_wdt.
 
+config RENESAS_WDT
+        tristate "Renesas WDT Watchdog"
+        depends on ARCH_RENESAS || COMPILE_TEST
+        select WATCHDOG_CORE
+        help
+          This driver adds watchdog support for the integrated watchdogs in the
+          Renesas R-Car and other SH-Mobile SoCs (usually named RWDT or SWDT).
+
 # AVR32 Architecture
 
 config AT32AP700X_WDT
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index feb6270fdbde..2cbc9709852d 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -73,6 +73,7 @@ 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_WDT) += renesas_wdt.o
 
 # AVR32 Architecture
 obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
new file mode 100644
index 000000000000..cf61c92f7ecd
--- /dev/null
+++ b/drivers/watchdog/renesas_wdt.c
@@ -0,0 +1,213 @@
+/*
+ * Watchdog driver for Renesas WDT watchdog
+ *
+ * Copyright (C) 2015-16 Wolfram Sang, Sang Engineering <wsa@sang-engineering.com>
+ * 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/bitops.h>
+#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 int clk_divs[] = { 1, 4, 16, 32, 64, 128, 1024 };
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+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 int clks_per_sec;
+        u8 cks;
+};
+
+static void rwdt_write(struct rwdt_priv *priv, u32 val, unsigned int 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_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 unsigned int rwdt_get_timeleft(struct watchdog_device *wdev)
+{
+        struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
+        u16 val = readw_relaxed(priv->base + RWTCNT);
+
+        return DIV_ROUND_CLOSEST(65536 - val, priv->clks_per_sec);
+}
+
+static const struct watchdog_info rwdt_ident = {
+        .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
+        .identity = "Renesas WDT Watchdog",
+};
+
+static const struct watchdog_ops rwdt_ops = {
+        .owner = THIS_MODULE,
+        .start = rwdt_start,
+        .stop = rwdt_stop,
+        .ping = rwdt_init_timeout,
+        .get_timeleft = rwdt_get_timeleft,
+};
+
+static int rwdt_probe(struct platform_device *pdev)
+{
+        struct rwdt_priv *priv;
+        struct resource *res;
+        unsigned long rate;
+        unsigned int 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) - 1; 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]) WDT. 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,rcar-gen3-wdt", },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rwdt_ids);
+
+static struct platform_driver rwdt_driver = {
+        .driver = {
+                .name = "renesas_wdt",
+                .of_match_table = rwdt_ids,
+        },
+        .probe = rwdt_probe,
+        .remove = rwdt_remove,
+};
+module_platform_driver(rwdt_driver);
+
+MODULE_DESCRIPTION("Renesas WDT Watchdog Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Wolfram Sang <wsa@sang-engineering.com>");