--- /dev/null
+/*
+ * PIC32 watchdog driver
+ *
+ * Joshua Henderson <joshua.henderson@microchip.com>
+ * Copyright (c) 2016, Microchip Technology Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/watchdog.h>
+
+#include <asm/mach-pic32/pic32.h>
+
+/* Watchdog Timer Registers */
+#define WDTCON_REG 0x00
+
+/* Watchdog Timer Control Register fields */
+#define WDTCON_WIN_EN BIT(0)
+#define WDTCON_RMCS_MASK 0x0003
+#define WDTCON_RMCS_SHIFT 0x0006
+#define WDTCON_RMPS_MASK 0x001F
+#define WDTCON_RMPS_SHIFT 0x0008
+#define WDTCON_ON BIT(15)
+#define WDTCON_CLR_KEY 0x5743
+
+/* Reset Control Register fields for watchdog */
+#define RESETCON_TIMEOUT_IDLE BIT(2)
+#define RESETCON_TIMEOUT_SLEEP BIT(3)
+#define RESETCON_WDT_TIMEOUT BIT(4)
+
+struct pic32_wdt {
+ void __iomem *regs;
+ void __iomem *rst_base;
+ struct clk *clk;
+};
+
+static inline bool pic32_wdt_is_win_enabled(struct pic32_wdt *wdt)
+{
+ return !!(readl(wdt->regs + WDTCON_REG) & WDTCON_WIN_EN);
+}
+
+static inline u32 pic32_wdt_get_post_scaler(struct pic32_wdt *wdt)
+{
+ u32 v = readl(wdt->regs + WDTCON_REG);
+
+ return (v >> WDTCON_RMPS_SHIFT) & WDTCON_RMPS_MASK;
+}
+
+static inline u32 pic32_wdt_get_clk_id(struct pic32_wdt *wdt)
+{
+ u32 v = readl(wdt->regs + WDTCON_REG);
+
+ return (v >> WDTCON_RMCS_SHIFT) & WDTCON_RMCS_MASK;
+}
+
+static int pic32_wdt_bootstatus(struct pic32_wdt *wdt)
+{
+ u32 v = readl(wdt->rst_base);
+
+ writel(RESETCON_WDT_TIMEOUT, PIC32_CLR(wdt->rst_base));
+
+ return v & RESETCON_WDT_TIMEOUT;
+}
+
+static u32 pic32_wdt_get_timeout_secs(struct pic32_wdt *wdt, struct device *dev)
+{
+ unsigned long rate;
+ u32 period, ps, terminal;
+
+ rate = clk_get_rate(wdt->clk);
+
+ dev_dbg(dev, "wdt: clk_id %d, clk_rate %lu (prescale)\n",
+ pic32_wdt_get_clk_id(wdt), rate);
+
+ /* default, prescaler of 32 (i.e. div-by-32) is implicit. */
+ rate >>= 5;
+ if (!rate)
+ return 0;
+
+ /* calculate terminal count from postscaler. */
+ ps = pic32_wdt_get_post_scaler(wdt);
+ terminal = BIT(ps);
+
+ /* find time taken (in secs) to reach terminal count */
+ period = terminal / rate;
+ dev_dbg(dev,
+ "wdt: clk_rate %lu (postscale) / terminal %d, timeout %dsec\n",
+ rate, terminal, period);
+
+ return period;
+}
+
+static void pic32_wdt_keepalive(struct pic32_wdt *wdt)
+{
+ /* write key through single half-word */
+ writew(WDTCON_CLR_KEY, wdt->regs + WDTCON_REG + 2);
+}
+
+static int pic32_wdt_start(struct watchdog_device *wdd)
+{
+ struct pic32_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ writel(WDTCON_ON, PIC32_SET(wdt->regs + WDTCON_REG));
+ pic32_wdt_keepalive(wdt);
+
+ return 0;
+}
+
+static int pic32_wdt_stop(struct watchdog_device *wdd)
+{
+ struct pic32_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ writel(WDTCON_ON, PIC32_CLR(wdt->regs + WDTCON_REG));
+
+ /*
+ * Cannot touch registers in the CPU cycle following clearing the
+ * ON bit.
+ */
+ nop();
+
+ return 0;
+}
+
+static int pic32_wdt_ping(struct watchdog_device *wdd)
+{
+ struct pic32_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ pic32_wdt_keepalive(wdt);
+
+ return 0;
+}
+
+static const struct watchdog_ops pic32_wdt_fops = {
+ .owner = THIS_MODULE,
+ .start = pic32_wdt_start,
+ .stop = pic32_wdt_stop,
+ .ping = pic32_wdt_ping,
+};
+
+static const struct watchdog_info pic32_wdt_ident = {
+ .options = WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE | WDIOF_CARDRESET,
+ .identity = "PIC32 Watchdog",
+};
+
+static struct watchdog_device pic32_wdd = {
+ .info = &pic32_wdt_ident,
+ .ops = &pic32_wdt_fops,
+};
+
+static const struct of_device_id pic32_wdt_dt_ids[] = {
+ { .compatible = "microchip,pic32mzda-wdt", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pic32_wdt_dt_ids);
+
+static int pic32_wdt_drv_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct watchdog_device *wdd = &pic32_wdd;
+ struct pic32_wdt *wdt;
+ struct resource *mem;
+
+ wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
+ if (IS_ERR(wdt))
+ return PTR_ERR(wdt);
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ wdt->regs = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(wdt->regs))
+ return PTR_ERR(wdt->regs);
+
+ wdt->rst_base = devm_ioremap(&pdev->dev, PIC32_BASE_RESET, 0x10);
+ if (IS_ERR(wdt->rst_base))
+ return PTR_ERR(wdt->rst_base);
+
+ wdt->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(wdt->clk)) {
+ dev_err(&pdev->dev, "clk not found\n");
+ return PTR_ERR(wdt->clk);
+ }
+
+ ret = clk_prepare_enable(wdt->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "clk enable failed\n");
+ return ret;
+ }
+
+ if (pic32_wdt_is_win_enabled(wdt)) {
+ dev_err(&pdev->dev, "windowed-clear mode is not supported.\n");
+ ret = -ENODEV;
+ goto out_disable_clk;
+ }
+
+ wdd->timeout = pic32_wdt_get_timeout_secs(wdt, &pdev->dev);
+ if (!wdd->timeout) {
+ dev_err(&pdev->dev,
+ "failed to read watchdog register timeout\n");
+ ret = -EINVAL;
+ goto out_disable_clk;
+ }
+
+ dev_info(&pdev->dev, "timeout %d\n", wdd->timeout);
+
+ wdd->bootstatus = pic32_wdt_bootstatus(wdt) ? WDIOF_CARDRESET : 0;
+
+ watchdog_set_nowayout(wdd, WATCHDOG_NOWAYOUT);
+ watchdog_set_drvdata(wdd, wdt);
+
+ ret = watchdog_register_device(wdd);
+ if (ret) {
+ dev_err(&pdev->dev, "watchdog register failed, err %d\n", ret);
+ goto out_disable_clk;
+ }
+
+ platform_set_drvdata(pdev, wdd);
+
+ return 0;
+
+out_disable_clk:
+ clk_disable_unprepare(wdt->clk);
+
+ return ret;
+}
+
+static int pic32_wdt_drv_remove(struct platform_device *pdev)
+{
+ struct watchdog_device *wdd = platform_get_drvdata(pdev);
+ struct pic32_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ watchdog_unregister_device(wdd);
+ clk_disable_unprepare(wdt->clk);
+
+ return 0;
+}
+
+static struct platform_driver pic32_wdt_driver = {
+ .probe = pic32_wdt_drv_probe,
+ .remove = pic32_wdt_drv_remove,
+ .driver = {
+ .name = "pic32-wdt",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pic32_wdt_dt_ids),
+ }
+};
+
+module_platform_driver(pic32_wdt_driver);
+
+MODULE_AUTHOR("Joshua Henderson <joshua.henderson@microchip.com>");
+MODULE_DESCRIPTION("Microchip PIC32 Watchdog Timer");
+MODULE_LICENSE("GPL");
projects / openwrt / staging / blogic.git / commitdiff