+++ /dev/null
---- /dev/null
-+++ b/drivers/watchdog/gemini_wdt.c
-@@ -0,0 +1,378 @@
-+/*
-+ * Watchdog driver for Cortina Systems Gemini SoC
-+ *
-+ * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
-+ *
-+ * 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/kernel.h>
-+#include <linux/init.h>
-+#include <linux/module.h>
-+#include <linux/io.h>
-+#include <linux/fs.h>
-+#include <linux/uaccess.h>
-+#include <linux/miscdevice.h>
-+#include <linux/platform_device.h>
-+#include <linux/watchdog.h>
-+#include <linux/slab.h>
-+
-+#define GEMINI_WDCOUNTER 0x0
-+#define GEMINI_WDLOAD 0x4
-+#define GEMINI_WDRESTART 0x8
-+
-+#define WDRESTART_MAGIC 0x5AB9
-+
-+#define GEMINI_WDCR 0xC
-+
-+#define WDCR_CLOCK_5MHZ (1 << 4)
-+#define WDCR_SYS_RST (1 << 1)
-+#define WDCR_ENABLE (1 << 0)
-+
-+#define WDT_CLOCK 5000000 /* 5 MHz */
-+#define WDT_DEFAULT_TIMEOUT 13
-+#define WDT_MAX_TIMEOUT (0xFFFFFFFF / WDT_CLOCK)
-+
-+/* status bits */
-+#define WDT_ACTIVE 0
-+#define WDT_OK_TO_CLOSE 1
-+
-+static unsigned int timeout = WDT_DEFAULT_TIMEOUT;
-+static int nowayout = WATCHDOG_NOWAYOUT;
-+
-+static DEFINE_SPINLOCK(gemini_wdt_lock);
-+
-+static struct platform_device *gemini_wdt_dev;
-+
-+struct gemini_wdt_struct {
-+ struct resource *res;
-+ struct device *dev;
-+ void __iomem *base;
-+ unsigned long status;
-+};
-+
-+static struct watchdog_info gemini_wdt_info = {
-+ .identity = "Gemini watchdog",
-+ .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
-+ WDIOF_SETTIMEOUT,
-+};
-+
-+/* Disable the watchdog. */
-+static void gemini_wdt_stop(struct gemini_wdt_struct *gemini_wdt)
-+{
-+ spin_lock(&gemini_wdt_lock);
-+
-+ __raw_writel(0, gemini_wdt->base + GEMINI_WDCR);
-+
-+ clear_bit(WDT_ACTIVE, &gemini_wdt->status);
-+
-+ spin_unlock(&gemini_wdt_lock);
-+}
-+
-+/* Service the watchdog */
-+static void gemini_wdt_service(struct gemini_wdt_struct *gemini_wdt)
-+{
-+ __raw_writel(WDRESTART_MAGIC, gemini_wdt->base + GEMINI_WDRESTART);
-+}
-+
-+/* Enable and reset the watchdog. */
-+static void gemini_wdt_start(struct gemini_wdt_struct *gemini_wdt)
-+{
-+ spin_lock(&gemini_wdt_lock);
-+
-+ __raw_writel(timeout * WDT_CLOCK, gemini_wdt->base + GEMINI_WDLOAD);
-+
-+ gemini_wdt_service(gemini_wdt);
-+
-+ /* set clock before enabling */
-+ __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST,
-+ gemini_wdt->base + GEMINI_WDCR);
-+
-+ __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST | WDCR_ENABLE,
-+ gemini_wdt->base + GEMINI_WDCR);
-+
-+ set_bit(WDT_ACTIVE, &gemini_wdt->status);
-+
-+ spin_unlock(&gemini_wdt_lock);
-+}
-+
-+/* Watchdog device is opened, and watchdog starts running. */
-+static int gemini_wdt_open(struct inode *inode, struct file *file)
-+{
-+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(gemini_wdt_dev);
-+
-+ if (test_bit(WDT_ACTIVE, &gemini_wdt->status))
-+ return -EBUSY;
-+
-+ file->private_data = gemini_wdt;
-+
-+ gemini_wdt_start(gemini_wdt);
-+
-+ return nonseekable_open(inode, file);
-+}
-+
-+/* Close the watchdog device. */
-+static int gemini_wdt_close(struct inode *inode, struct file *file)
-+{
-+ struct gemini_wdt_struct *gemini_wdt = file->private_data;
-+
-+ /* Disable the watchdog if possible */
-+ if (test_bit(WDT_OK_TO_CLOSE, &gemini_wdt->status))
-+ gemini_wdt_stop(gemini_wdt);
-+ else
-+ dev_warn(gemini_wdt->dev, "Device closed unexpectedly - timer will not stop\n");
-+
-+ return 0;
-+}
-+
-+/* Handle commands from user-space. */
-+static long gemini_wdt_ioctl(struct file *file, unsigned int cmd,
-+ unsigned long arg)
-+{
-+ struct gemini_wdt_struct *gemini_wdt = file->private_data;
-+
-+ int value;
-+
-+ switch (cmd) {
-+ case WDIOC_KEEPALIVE:
-+ gemini_wdt_service(gemini_wdt);
-+ return 0;
-+
-+ case WDIOC_GETSUPPORT:
-+ return copy_to_user((struct watchdog_info *)arg, &gemini_wdt_info,
-+ sizeof(gemini_wdt_info)) ? -EFAULT : 0;
-+
-+ case WDIOC_SETTIMEOUT:
-+ if (get_user(value, (int *)arg))
-+ return -EFAULT;
-+
-+ if ((value < 1) || (value > WDT_MAX_TIMEOUT))
-+ return -EINVAL;
-+
-+ timeout = value;
-+
-+ /* restart wdt to use new timeout */
-+ gemini_wdt_stop(gemini_wdt);
-+ gemini_wdt_start(gemini_wdt);
-+
-+ /* Fall through */
-+ case WDIOC_GETTIMEOUT:
-+ return put_user(timeout, (int *)arg);
-+
-+ case WDIOC_GETTIMELEFT:
-+ value = __raw_readl(gemini_wdt->base + GEMINI_WDCOUNTER);
-+ return put_user(value / WDT_CLOCK, (int *)arg);
-+
-+ default:
-+ return -ENOTTY;
-+ }
-+}
-+
-+/* Refresh the watchdog whenever device is written to. */
-+static ssize_t gemini_wdt_write(struct file *file, const char *data,
-+ size_t len, loff_t *ppos)
-+{
-+ struct gemini_wdt_struct *gemini_wdt = file->private_data;
-+
-+ if (len) {
-+ if (!nowayout) {
-+ size_t i;
-+
-+ clear_bit(WDT_OK_TO_CLOSE, &gemini_wdt->status);
-+ for (i = 0; i != len; i++) {
-+ char c;
-+
-+ if (get_user(c, data + i))
-+ return -EFAULT;
-+ if (c == 'V')
-+ set_bit(WDT_OK_TO_CLOSE,
-+ &gemini_wdt->status);
-+ }
-+ }
-+ gemini_wdt_service(gemini_wdt);
-+ }
-+
-+ return len;
-+}
-+
-+static const struct file_operations gemini_wdt_fops = {
-+ .owner = THIS_MODULE,
-+ .llseek = no_llseek,
-+ .unlocked_ioctl = gemini_wdt_ioctl,
-+ .open = gemini_wdt_open,
-+ .release = gemini_wdt_close,
-+ .write = gemini_wdt_write,
-+};
-+
-+static struct miscdevice gemini_wdt_miscdev = {
-+ .minor = WATCHDOG_MINOR,
-+ .name = "watchdog",
-+ .fops = &gemini_wdt_fops,
-+};
-+
-+static void gemini_wdt_shutdown(struct platform_device *pdev)
-+{
-+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
-+
-+ gemini_wdt_stop(gemini_wdt);
-+}
-+
-+static int gemini_wdt_probe(struct platform_device *pdev)
-+{
-+ int ret;
-+ int res_size;
-+ struct resource *res;
-+ void __iomem *base;
-+ struct gemini_wdt_struct *gemini_wdt;
-+ unsigned int reg;
-+
-+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ if (!res) {
-+ dev_err(&pdev->dev, "can't get device resources\n");
-+ return -ENODEV;
-+ }
-+
-+ res_size = resource_size(res);
-+ if (!request_mem_region(res->start, res_size, res->name)) {
-+ dev_err(&pdev->dev, "can't allocate %d bytes at %d address\n",
-+ res_size, res->start);
-+ return -ENOMEM;
-+ }
-+
-+ base = ioremap(res->start, res_size);
-+ if (!base) {
-+ dev_err(&pdev->dev, "ioremap failed\n");
-+ ret = -EIO;
-+ goto fail0;
-+ }
-+
-+ gemini_wdt = kzalloc(sizeof(struct gemini_wdt_struct), GFP_KERNEL);
-+ if (!gemini_wdt) {
-+ dev_err(&pdev->dev, "can't allocate interface\n");
-+ ret = -ENOMEM;
-+ goto fail1;
-+ }
-+
-+ /* Setup gemini_wdt driver structure */
-+ gemini_wdt->base = base;
-+ gemini_wdt->res = res;
-+
-+ /* Set up platform driver data */
-+ platform_set_drvdata(pdev, gemini_wdt);
-+ gemini_wdt_dev = pdev;
-+
-+ if (gemini_wdt_miscdev.parent) {
-+ ret = -EBUSY;
-+ goto fail2;
-+ }
-+
-+ gemini_wdt_miscdev.parent = &pdev->dev;
-+
-+ reg = __raw_readw(gemini_wdt->base + GEMINI_WDCR);
-+ if (reg & WDCR_ENABLE) {
-+ /* Watchdog was enabled by the bootloader, disable it. */
-+ reg &= ~(WDCR_ENABLE);
-+ __raw_writel(reg, gemini_wdt->base + GEMINI_WDCR);
-+ }
-+
-+ ret = misc_register(&gemini_wdt_miscdev);
-+ if (ret)
-+ goto fail2;
-+
-+ return 0;
-+
-+fail2:
-+ platform_set_drvdata(pdev, NULL);
-+ kfree(gemini_wdt);
-+fail1:
-+ iounmap(base);
-+fail0:
-+ release_mem_region(res->start, res_size);
-+
-+ return ret;
-+}
-+
-+static int gemini_wdt_remove(struct platform_device *pdev)
-+{
-+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
-+
-+ platform_set_drvdata(pdev, NULL);
-+ misc_deregister(&gemini_wdt_miscdev);
-+ gemini_wdt_dev = NULL;
-+ iounmap(gemini_wdt->base);
-+ release_mem_region(gemini_wdt->res->start, resource_size(gemini_wdt->res));
-+
-+ kfree(gemini_wdt);
-+
-+ return 0;
-+}
-+
-+#ifdef CONFIG_PM
-+static int gemini_wdt_suspend(struct platform_device *pdev, pm_message_t message)
-+{
-+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
-+ unsigned int reg;
-+
-+ reg = __raw_readw(gemini_wdt->base + GEMINI_WDCR);
-+ reg &= ~(WDCR_WDENABLE);
-+ __raw_writel(reg, gemini_wdt->base + GEMINI_WDCR);
-+
-+ return 0;
-+}
-+
-+static int gemini_wdt_resume(struct platform_device *pdev)
-+{
-+ struct gemini_wdt_struct *gemini_wdt = platform_get_drvdata(pdev);
-+ unsigned int reg;
-+
-+ if (gemini_wdt->status) {
-+ reg = __raw_readw(gemini_wdt->base + GEMINI_WDCR);
-+ reg |= WDCR_WDENABLE;
-+ __raw_writel(reg, gemini_wdt->base + GEMINI_WDCR);
-+ }
-+
-+ return 0;
-+}
-+#else
-+#define gemini_wdt_suspend NULL
-+#define gemini_wdt_resume NULL
-+#endif
-+
-+static struct platform_driver gemini_wdt_driver = {
-+ .probe = gemini_wdt_probe,
-+ .remove = gemini_wdt_remove,
-+ .shutdown = gemini_wdt_shutdown,
-+ .suspend = gemini_wdt_suspend,
-+ .resume = gemini_wdt_resume,
-+ .driver = {
-+ .name = "gemini-wdt",
-+ .owner = THIS_MODULE,
-+ },
-+};
-+
-+static int __init gemini_wdt_init(void)
-+{
-+ return platform_driver_probe(&gemini_wdt_driver, gemini_wdt_probe);
-+}
-+
-+static void __exit gemini_wdt_exit(void)
-+{
-+ platform_driver_unregister(&gemini_wdt_driver);
-+}
-+
-+module_init(gemini_wdt_init);
-+module_exit(gemini_wdt_exit);
-+
-+module_param(timeout, uint, 0);
-+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
-+
-+module_param(nowayout, int, 0);
-+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
-+
-+MODULE_AUTHOR("Paulius Zaleckas");
-+MODULE_DESCRIPTION("Watchdog driver for Gemini");
-+MODULE_LICENSE("GPL");
-+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
-+MODULE_ALIAS("platform:gemini-wdt");
---- a/drivers/watchdog/Kconfig
-+++ b/drivers/watchdog/Kconfig
-@@ -154,6 +154,16 @@ config 977_WATCHDOG
-
- Not sure? It's safe to say N.
-
-+config GEMINI_WATCHDOG
-+ tristate "Gemini watchdog"
-+ depends on ARCH_GEMINI
-+ help
-+ Say Y here if to include support for the watchdog timer
-+ embedded in the Cortina Systems Gemini family of devices.
-+
-+ To compile this driver as a module, choose M here: the
-+ module will be called gemini_wdt.
-+
- config IXP4XX_WATCHDOG
- tristate "IXP4xx Watchdog"
- depends on ARCH_IXP4XX
---- a/drivers/watchdog/Makefile
-+++ b/drivers/watchdog/Makefile
-@@ -36,6 +36,7 @@ obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.
- obj-$(CONFIG_TWL4030_WATCHDOG) += twl4030_wdt.o
- obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
- obj-$(CONFIG_977_WATCHDOG) += wdt977.o
-+obj-$(CONFIG_GEMINI_WATCHDOG) += gemini_wdt.o
- obj-$(CONFIG_IXP4XX_WATCHDOG) += ixp4xx_wdt.o
- obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o
- obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
projects / openwrt.git / blobdiff