#include <linux/slab.h>
#include <linux/err.h>
#include <linux/of.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
#define S3C2410_WTCON 0x00
#define S3C2410_WTDAT 0x04
#define CONFIG_S3C2410_WATCHDOG_ATBOOT (0)
#define CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME (15)
+#define EXYNOS5_RST_STAT_REG_OFFSET 0x0404
+#define EXYNOS5_WDT_DISABLE_REG_OFFSET 0x0408
+#define EXYNOS5_WDT_MASK_RESET_REG_OFFSET 0x040c
+#define QUIRK_HAS_PMU_CONFIG (1 << 0)
+#define QUIRK_HAS_RST_STAT (1 << 1)
+
+/* These quirks require that we have a PMU register map */
+#define QUIRKS_HAVE_PMUREG (QUIRK_HAS_PMU_CONFIG | \
+ QUIRK_HAS_RST_STAT)
+
static bool nowayout = WATCHDOG_NOWAYOUT;
static int tmr_margin;
static int tmr_atboot = CONFIG_S3C2410_WATCHDOG_ATBOOT;
"0 to reboot (default 0)");
MODULE_PARM_DESC(debug, "Watchdog debug, set to >1 for debug (default 0)");
+/**
+ * struct s3c2410_wdt_variant - Per-variant config data
+ *
+ * @disable_reg: Offset in pmureg for the register that disables the watchdog
+ * timer reset functionality.
+ * @mask_reset_reg: Offset in pmureg for the register that masks the watchdog
+ * timer reset functionality.
+ * @mask_bit: Bit number for the watchdog timer in the disable register and the
+ * mask reset register.
+ * @rst_stat_reg: Offset in pmureg for the register that has the reset status.
+ * @rst_stat_bit: Bit number in the rst_stat register indicating a watchdog
+ * reset.
+ * @quirks: A bitfield of quirks.
+ */
+
+struct s3c2410_wdt_variant {
+ int disable_reg;
+ int mask_reset_reg;
+ int mask_bit;
+ int rst_stat_reg;
+ int rst_stat_bit;
+ u32 quirks;
+};
+
struct s3c2410_wdt {
struct device *dev;
struct clk *clock;
unsigned long wtdat_save;
struct watchdog_device wdt_device;
struct notifier_block freq_transition;
+ struct s3c2410_wdt_variant *drv_data;
+ struct regmap *pmureg;
};
+static const struct s3c2410_wdt_variant drv_data_s3c2410 = {
+ .quirks = 0
+};
+
+#ifdef CONFIG_OF
+static const struct s3c2410_wdt_variant drv_data_exynos5250 = {
+ .disable_reg = EXYNOS5_WDT_DISABLE_REG_OFFSET,
+ .mask_reset_reg = EXYNOS5_WDT_MASK_RESET_REG_OFFSET,
+ .mask_bit = 20,
+ .rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
+ .rst_stat_bit = 20,
+ .quirks = QUIRK_HAS_PMU_CONFIG | QUIRK_HAS_RST_STAT,
+};
+
+static const struct s3c2410_wdt_variant drv_data_exynos5420 = {
+ .disable_reg = EXYNOS5_WDT_DISABLE_REG_OFFSET,
+ .mask_reset_reg = EXYNOS5_WDT_MASK_RESET_REG_OFFSET,
+ .mask_bit = 0,
+ .rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
+ .rst_stat_bit = 9,
+ .quirks = QUIRK_HAS_PMU_CONFIG | QUIRK_HAS_RST_STAT,
+};
+
+static const struct of_device_id s3c2410_wdt_match[] = {
+ { .compatible = "samsung,s3c2410-wdt",
+ .data = &drv_data_s3c2410 },
+ { .compatible = "samsung,exynos5250-wdt",
+ .data = &drv_data_exynos5250 },
+ { .compatible = "samsung,exynos5420-wdt",
+ .data = &drv_data_exynos5420 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
+#endif
+
+static const struct platform_device_id s3c2410_wdt_ids[] = {
+ {
+ .name = "s3c2410-wdt",
+ .driver_data = (unsigned long)&drv_data_s3c2410,
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(platform, s3c2410_wdt_ids);
+
/* watchdog control routines */
#define DBG(fmt, ...) \
return container_of(nb, struct s3c2410_wdt, freq_transition);
}
+static int s3c2410wdt_mask_and_disable_reset(struct s3c2410_wdt *wdt, bool mask)
+{
+ int ret;
+ u32 mask_val = 1 << wdt->drv_data->mask_bit;
+ u32 val = 0;
+
+ /* No need to do anything if no PMU CONFIG needed */
+ if (!(wdt->drv_data->quirks & QUIRK_HAS_PMU_CONFIG))
+ return 0;
+
+ if (mask)
+ val = mask_val;
+
+ ret = regmap_update_bits(wdt->pmureg,
+ wdt->drv_data->disable_reg,
+ mask_val, val);
+ if (ret < 0)
+ goto error;
+
+ ret = regmap_update_bits(wdt->pmureg,
+ wdt->drv_data->mask_reset_reg,
+ mask_val, val);
+ error:
+ if (ret < 0)
+ dev_err(wdt->dev, "failed to update reg(%d)\n", ret);
+
+ return ret;
+}
+
static int s3c2410wdt_keepalive(struct watchdog_device *wdd)
{
struct s3c2410_wdt *wdt = watchdog_get_drvdata(wdd);
if (timeout < 1)
return -EINVAL;
- freq /= 128;
+ freq = DIV_ROUND_UP(freq, 128);
count = timeout * freq;
DBG("%s: count=%d, timeout=%d, freq=%lu\n",
*/
if (count >= 0x10000) {
- for (divisor = 1; divisor <= 0x100; divisor++) {
- if ((count / divisor) < 0x10000)
- break;
- }
+ divisor = DIV_ROUND_UP(count, 0xffff);
- if ((count / divisor) >= 0x10000) {
+ if (divisor > 0x100) {
dev_err(wdt->dev, "timeout %d too big\n", timeout);
return -EINVAL;
}
}
DBG("%s: timeout=%d, divisor=%d, count=%d (%08x)\n",
- __func__, timeout, divisor, count, count/divisor);
+ __func__, timeout, divisor, count, DIV_ROUND_UP(count, divisor));
- count /= divisor;
+ count = DIV_ROUND_UP(count, divisor);
wdt->count = count;
/* update the pre-scaler */
return IRQ_HANDLED;
}
-#ifdef CONFIG_CPU_FREQ
+#ifdef CONFIG_ARM_S3C24XX_CPUFREQ
static int s3c2410wdt_cpufreq_transition(struct notifier_block *nb,
unsigned long val, void *data)
}
#endif
+static inline unsigned int s3c2410wdt_get_bootstatus(struct s3c2410_wdt *wdt)
+{
+ unsigned int rst_stat;
+ int ret;
+
+ if (!(wdt->drv_data->quirks & QUIRK_HAS_RST_STAT))
+ return 0;
+
+ ret = regmap_read(wdt->pmureg, wdt->drv_data->rst_stat_reg, &rst_stat);
+ if (ret)
+ dev_warn(wdt->dev, "Couldn't get RST_STAT register\n");
+ else if (rst_stat & BIT(wdt->drv_data->rst_stat_bit))
+ return WDIOF_CARDRESET;
+
+ return 0;
+}
+
+/* s3c2410_get_wdt_driver_data */
+static inline struct s3c2410_wdt_variant *
+get_wdt_drv_data(struct platform_device *pdev)
+{
+ if (pdev->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_node(s3c2410_wdt_match, pdev->dev.of_node);
+ return (struct s3c2410_wdt_variant *)match->data;
+ } else {
+ return (struct s3c2410_wdt_variant *)
+ platform_get_device_id(pdev)->driver_data;
+ }
+}
+
static int s3c2410wdt_probe(struct platform_device *pdev)
{
struct device *dev;
spin_lock_init(&wdt->lock);
wdt->wdt_device = s3c2410_wdd;
+ wdt->drv_data = get_wdt_drv_data(pdev);
+ if (wdt->drv_data->quirks & QUIRKS_HAVE_PMUREG) {
+ wdt->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "samsung,syscon-phandle");
+ if (IS_ERR(wdt->pmureg)) {
+ dev_err(dev, "syscon regmap lookup failed.\n");
+ return PTR_ERR(wdt->pmureg);
+ }
+ }
+
wdt_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (wdt_irq == NULL) {
dev_err(dev, "no irq resource specified\n");
watchdog_set_nowayout(&wdt->wdt_device, nowayout);
+ wdt->wdt_device.bootstatus = s3c2410wdt_get_bootstatus(wdt);
+
ret = watchdog_register_device(&wdt->wdt_device);
if (ret) {
dev_err(dev, "cannot register watchdog (%d)\n", ret);
goto err_cpufreq;
}
+ ret = s3c2410wdt_mask_and_disable_reset(wdt, false);
+ if (ret < 0)
+ goto err_unregister;
+
if (tmr_atboot && started == 0) {
dev_info(dev, "starting watchdog timer\n");
s3c2410wdt_start(&wdt->wdt_device);
return 0;
+ err_unregister:
+ watchdog_unregister_device(&wdt->wdt_device);
+
err_cpufreq:
s3c2410wdt_cpufreq_deregister(wdt);
static int s3c2410wdt_remove(struct platform_device *dev)
{
+ int ret;
struct s3c2410_wdt *wdt = platform_get_drvdata(dev);
+ ret = s3c2410wdt_mask_and_disable_reset(wdt, true);
+ if (ret < 0)
+ return ret;
+
watchdog_unregister_device(&wdt->wdt_device);
s3c2410wdt_cpufreq_deregister(wdt);
{
struct s3c2410_wdt *wdt = platform_get_drvdata(dev);
+ s3c2410wdt_mask_and_disable_reset(wdt, true);
+
s3c2410wdt_stop(&wdt->wdt_device);
}
static int s3c2410wdt_suspend(struct device *dev)
{
+ int ret;
struct s3c2410_wdt *wdt = dev_get_drvdata(dev);
/* Save watchdog state, and turn it off. */
wdt->wtcon_save = readl(wdt->reg_base + S3C2410_WTCON);
wdt->wtdat_save = readl(wdt->reg_base + S3C2410_WTDAT);
+ ret = s3c2410wdt_mask_and_disable_reset(wdt, true);
+ if (ret < 0)
+ return ret;
+
/* Note that WTCNT doesn't need to be saved. */
s3c2410wdt_stop(&wdt->wdt_device);
static int s3c2410wdt_resume(struct device *dev)
{
+ int ret;
struct s3c2410_wdt *wdt = dev_get_drvdata(dev);
/* Restore watchdog state. */
writel(wdt->wtdat_save, wdt->reg_base + S3C2410_WTCNT);/* Reset count */
writel(wdt->wtcon_save, wdt->reg_base + S3C2410_WTCON);
+ ret = s3c2410wdt_mask_and_disable_reset(wdt, false);
+ if (ret < 0)
+ return ret;
+
dev_info(dev, "watchdog %sabled\n",
(wdt->wtcon_save & S3C2410_WTCON_ENABLE) ? "en" : "dis");
static SIMPLE_DEV_PM_OPS(s3c2410wdt_pm_ops, s3c2410wdt_suspend,
s3c2410wdt_resume);
-#ifdef CONFIG_OF
-static const struct of_device_id s3c2410_wdt_match[] = {
- { .compatible = "samsung,s3c2410-wdt" },
- {},
-};
-MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
-#endif
-
static struct platform_driver s3c2410wdt_driver = {
.probe = s3c2410wdt_probe,
.remove = s3c2410wdt_remove,
.shutdown = s3c2410wdt_shutdown,
+ .id_table = s3c2410_wdt_ids,
.driver = {
.owner = THIS_MODULE,
.name = "s3c2410-wdt",
"Dimitry Andric <dimitry.andric@tomtom.com>");
MODULE_DESCRIPTION("S3C2410 Watchdog Device Driver");
MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:s3c2410-wdt");
projects / cascardo / linux.git / blobdiff