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watchdog: st_wdt: Add new driver for ST's LPC Watchdog
authorLee Jones <lee.jones@linaro.org>
Thu, 9 Apr 2015 14:47:31 +0000 (15:47 +0100)
committerLee Jones <lee.jones@linaro.org>
Thu, 30 Apr 2015 12:21:28 +0000 (13:21 +0100)
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David Paris <david.paris@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
drivers/watchdog/Kconfig
drivers/watchdog/Makefile
drivers/watchdog/st_lpc_wdt.c [new file with mode: 0644]

index e5e7c55..262647b 100644 (file)
@@ -470,6 +470,18 @@ config SIRFSOC_WATCHDOG
          Support for CSR SiRFprimaII and SiRFatlasVI watchdog. When
          the watchdog triggers the system will be reset.
 
+config ST_LPC_WATCHDOG
+       tristate "STMicroelectronics LPC Watchdog"
+       depends on ARCH_STI
+       depends on OF
+       select WATCHDOG_CORE
+       help
+         Say Y here to include STMicroelectronics Low Power Controller
+         (LPC) based Watchdog timer support.
+
+         To compile this driver as a module, choose M here: the
+         module will be called st_lpc_wdt.
+
 config TEGRA_WATCHDOG
        tristate "Tegra watchdog"
        depends on (ARCH_TEGRA || COMPILE_TEST) && HAS_IOMEM
index 5c19294..d98768c 100644 (file)
@@ -59,6 +59,7 @@ obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
 obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o
 obj-$(CONFIG_MOXART_WDT) += moxart_wdt.o
 obj-$(CONFIG_SIRFSOC_WATCHDOG) += sirfsoc_wdt.o
+obj-$(CONFIG_ST_LPC_WATCHDOG) += st_lpc_wdt.o
 obj-$(CONFIG_QCOM_WDT) += qcom-wdt.o
 obj-$(CONFIG_BCM_KONA_WDT) += bcm_kona_wdt.o
 obj-$(CONFIG_TEGRA_WATCHDOG) += tegra_wdt.o
diff --git a/drivers/watchdog/st_lpc_wdt.c b/drivers/watchdog/st_lpc_wdt.c
new file mode 100644 (file)
index 0000000..f32be15
--- /dev/null
@@ -0,0 +1,344 @@
+/*
+ * ST's LPC Watchdog
+ *
+ * Copyright (C) 2014 STMicroelectronics -- All Rights Reserved
+ *
+ * Author: David Paris <david.paris@st.com> for STMicroelectronics
+ *         Lee Jones <lee.jones@linaro.org> for STMicroelectronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/watchdog.h>
+
+#include <dt-bindings/mfd/st-lpc.h>
+
+/* Low Power Alarm */
+#define LPC_LPA_LSB_OFF                        0x410
+#define LPC_LPA_START_OFF              0x418
+
+/* LPC as WDT */
+#define LPC_WDT_OFF                    0x510
+
+static struct watchdog_device st_wdog_dev;
+
+struct st_wdog_syscfg {
+       unsigned int reset_type_reg;
+       unsigned int reset_type_mask;
+       unsigned int enable_reg;
+       unsigned int enable_mask;
+};
+
+struct st_wdog {
+       void __iomem *base;
+       struct device *dev;
+       struct regmap *regmap;
+       struct st_wdog_syscfg *syscfg;
+       struct clk *clk;
+       unsigned long clkrate;
+       bool warm_reset;
+};
+
+static struct st_wdog_syscfg stid127_syscfg = {
+       .reset_type_reg         = 0x004,
+       .reset_type_mask        = BIT(2),
+       .enable_reg             = 0x000,
+       .enable_mask            = BIT(2),
+};
+
+static struct st_wdog_syscfg stih415_syscfg = {
+       .reset_type_reg         = 0x0B8,
+       .reset_type_mask        = BIT(6),
+       .enable_reg             = 0x0B4,
+       .enable_mask            = BIT(7),
+};
+
+static struct st_wdog_syscfg stih416_syscfg = {
+       .reset_type_reg         = 0x88C,
+       .reset_type_mask        = BIT(6),
+       .enable_reg             = 0x888,
+       .enable_mask            = BIT(7),
+};
+
+static struct st_wdog_syscfg stih407_syscfg = {
+       .enable_reg             = 0x204,
+       .enable_mask            = BIT(19),
+};
+
+static const struct of_device_id st_wdog_match[] = {
+       {
+               .compatible = "st,stih407-lpc",
+               .data = &stih407_syscfg,
+       },
+       {
+               .compatible = "st,stih416-lpc",
+               .data = &stih416_syscfg,
+       },
+       {
+               .compatible = "st,stih415-lpc",
+               .data = &stih415_syscfg,
+       },
+       {
+               .compatible = "st,stid127-lpc",
+               .data = &stid127_syscfg,
+       },
+       {},
+};
+MODULE_DEVICE_TABLE(of, st_wdog_match);
+
+static void st_wdog_setup(struct st_wdog *st_wdog, bool enable)
+{
+       /* Type of watchdog reset - 0: Cold 1: Warm */
+       if (st_wdog->syscfg->reset_type_reg)
+               regmap_update_bits(st_wdog->regmap,
+                                  st_wdog->syscfg->reset_type_reg,
+                                  st_wdog->syscfg->reset_type_mask,
+                                  st_wdog->warm_reset);
+
+       /* Mask/unmask watchdog reset */
+       regmap_update_bits(st_wdog->regmap,
+                          st_wdog->syscfg->enable_reg,
+                          st_wdog->syscfg->enable_mask,
+                          enable ? 0 : st_wdog->syscfg->enable_mask);
+}
+
+static void st_wdog_load_timer(struct st_wdog *st_wdog, unsigned int timeout)
+{
+       unsigned long clkrate = st_wdog->clkrate;
+
+       writel_relaxed(timeout * clkrate, st_wdog->base + LPC_LPA_LSB_OFF);
+       writel_relaxed(1, st_wdog->base + LPC_LPA_START_OFF);
+}
+
+static int st_wdog_start(struct watchdog_device *wdd)
+{
+       struct st_wdog *st_wdog = watchdog_get_drvdata(wdd);
+
+       writel_relaxed(1, st_wdog->base + LPC_WDT_OFF);
+
+       return 0;
+}
+
+static int st_wdog_stop(struct watchdog_device *wdd)
+{
+       struct st_wdog *st_wdog = watchdog_get_drvdata(wdd);
+
+       writel_relaxed(0, st_wdog->base + LPC_WDT_OFF);
+
+       return 0;
+}
+
+static int st_wdog_set_timeout(struct watchdog_device *wdd,
+                              unsigned int timeout)
+{
+       struct st_wdog *st_wdog = watchdog_get_drvdata(wdd);
+
+       wdd->timeout = timeout;
+       st_wdog_load_timer(st_wdog, timeout);
+
+       return 0;
+}
+
+static int st_wdog_keepalive(struct watchdog_device *wdd)
+{
+       struct st_wdog *st_wdog = watchdog_get_drvdata(wdd);
+
+       st_wdog_load_timer(st_wdog, wdd->timeout);
+
+       return 0;
+}
+
+static const struct watchdog_info st_wdog_info = {
+       .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+       .identity = "ST LPC WDT",
+};
+
+static const struct watchdog_ops st_wdog_ops = {
+       .owner          = THIS_MODULE,
+       .start          = st_wdog_start,
+       .stop           = st_wdog_stop,
+       .ping           = st_wdog_keepalive,
+       .set_timeout    = st_wdog_set_timeout,
+};
+
+static struct watchdog_device st_wdog_dev = {
+       .info           = &st_wdog_info,
+       .ops            = &st_wdog_ops,
+};
+
+static int st_wdog_probe(struct platform_device *pdev)
+{
+       const struct of_device_id *match;
+       struct device_node *np = pdev->dev.of_node;
+       struct st_wdog *st_wdog;
+       struct regmap *regmap;
+       struct resource *res;
+       struct clk *clk;
+       void __iomem *base;
+       uint32_t mode;
+       int ret;
+
+       ret = of_property_read_u32(np, "st,lpc-mode", &mode);
+       if (ret) {
+               dev_err(&pdev->dev, "An LPC mode must be provided\n");
+               return -EINVAL;
+       }
+
+       /* LPC can either run in RTC or WDT mode */
+       if (mode != ST_LPC_MODE_WDT)
+               return -ENODEV;
+
+       st_wdog = devm_kzalloc(&pdev->dev, sizeof(*st_wdog), GFP_KERNEL);
+       if (!st_wdog)
+               return -ENOMEM;
+
+       match = of_match_device(st_wdog_match, &pdev->dev);
+       if (!match) {
+               dev_err(&pdev->dev, "Couldn't match device\n");
+               return -ENODEV;
+       }
+       st_wdog->syscfg = (struct st_wdog_syscfg *)match->data;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(base))
+               return PTR_ERR(base);
+
+       regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
+       if (IS_ERR(regmap)) {
+               dev_err(&pdev->dev, "No syscfg phandle specified\n");
+               return PTR_ERR(regmap);
+       }
+
+       clk = devm_clk_get(&pdev->dev, NULL);
+       if (IS_ERR(clk)) {
+               dev_err(&pdev->dev, "Unable to request clock\n");
+               return PTR_ERR(clk);
+       }
+
+       st_wdog->dev            = &pdev->dev;
+       st_wdog->base           = base;
+       st_wdog->clk            = clk;
+       st_wdog->regmap         = regmap;
+       st_wdog->warm_reset     = of_property_read_bool(np, "st,warm_reset");
+       st_wdog->clkrate        = clk_get_rate(st_wdog->clk);
+
+       if (!st_wdog->clkrate) {
+               dev_err(&pdev->dev, "Unable to fetch clock rate\n");
+               return -EINVAL;
+       }
+       st_wdog_dev.max_timeout = 0xFFFFFFFF / st_wdog->clkrate;
+
+       ret = clk_prepare_enable(clk);
+       if (ret) {
+               dev_err(&pdev->dev, "Unable to enable clock\n");
+               return ret;
+       }
+
+       watchdog_set_drvdata(&st_wdog_dev, st_wdog);
+       watchdog_set_nowayout(&st_wdog_dev, WATCHDOG_NOWAYOUT);
+
+       /* Init Watchdog timeout with value in DT */
+       ret = watchdog_init_timeout(&st_wdog_dev, 0, &pdev->dev);
+       if (ret) {
+               dev_err(&pdev->dev, "Unable to initialise watchdog timeout\n");
+               clk_disable_unprepare(clk);
+               return ret;
+       }
+
+       ret = watchdog_register_device(&st_wdog_dev);
+       if (ret) {
+               dev_err(&pdev->dev, "Unable to register watchdog\n");
+               clk_disable_unprepare(clk);
+               return ret;
+       }
+
+       st_wdog_setup(st_wdog, true);
+
+       dev_info(&pdev->dev, "LPC Watchdog driver registered, reset type is %s",
+                st_wdog->warm_reset ? "warm" : "cold");
+
+       return ret;
+}
+
+static int st_wdog_remove(struct platform_device *pdev)
+{
+       struct st_wdog *st_wdog = watchdog_get_drvdata(&st_wdog_dev);
+
+       st_wdog_setup(st_wdog, false);
+       watchdog_unregister_device(&st_wdog_dev);
+       clk_disable_unprepare(st_wdog->clk);
+
+       return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int st_wdog_suspend(struct device *dev)
+{
+       struct st_wdog *st_wdog = watchdog_get_drvdata(&st_wdog_dev);
+
+       if (watchdog_active(&st_wdog_dev))
+               st_wdog_stop(&st_wdog_dev);
+
+       st_wdog_setup(st_wdog, false);
+
+       clk_disable(st_wdog->clk);
+
+       return 0;
+}
+
+static int st_wdog_resume(struct device *dev)
+{
+       struct st_wdog *st_wdog = watchdog_get_drvdata(&st_wdog_dev);
+       int ret;
+
+       ret = clk_enable(st_wdog->clk);
+       if (ret) {
+               dev_err(dev, "Unable to re-enable clock\n");
+               watchdog_unregister_device(&st_wdog_dev);
+               clk_unprepare(st_wdog->clk);
+               return ret;
+       }
+
+       st_wdog_setup(st_wdog, true);
+
+       if (watchdog_active(&st_wdog_dev)) {
+               st_wdog_load_timer(st_wdog, st_wdog_dev.timeout);
+               st_wdog_start(&st_wdog_dev);
+       }
+
+       return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(st_wdog_pm_ops,
+                        st_wdog_suspend,
+                        st_wdog_resume);
+
+static struct platform_driver st_wdog_driver = {
+       .driver = {
+               .name = "st-lpc-wdt",
+               .pm = &st_wdog_pm_ops,
+               .of_match_table = st_wdog_match,
+       },
+       .probe = st_wdog_probe,
+       .remove = st_wdog_remove,
+};
+module_platform_driver(st_wdog_driver);
+
+MODULE_AUTHOR("David Paris <david.paris@st.com>");
+MODULE_DESCRIPTION("ST LPC Watchdog Driver");
+MODULE_LICENSE("GPL");