summaryrefslogtreecommitdiff
path: root/target/linux/cns21xx/patches-3.2/006-arm-add-fa-watchdog-driver.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/cns21xx/patches-3.2/006-arm-add-fa-watchdog-driver.patch')
-rw-r--r--target/linux/cns21xx/patches-3.2/006-arm-add-fa-watchdog-driver.patch458
1 files changed, 458 insertions, 0 deletions
diff --git a/target/linux/cns21xx/patches-3.2/006-arm-add-fa-watchdog-driver.patch b/target/linux/cns21xx/patches-3.2/006-arm-add-fa-watchdog-driver.patch
new file mode 100644
index 0000000000..34e374228d
--- /dev/null
+++ b/target/linux/cns21xx/patches-3.2/006-arm-add-fa-watchdog-driver.patch
@@ -0,0 +1,458 @@
+--- a/drivers/watchdog/Kconfig
++++ b/drivers/watchdog/Kconfig
+@@ -343,6 +343,13 @@ config IMX2_WDT
+ To compile this driver as a module, choose M here: the
+ module will be called imx2_wdt.
+
++config FA_WATCHDOG
++ tristate "Faraday watchdog"
++ depends on ARCH_GEMINI
++ help
++ Say Y here if you want support for the built-in watchdog timer
++ found in some Faraday FA526 based SoCs.
++
+ # AVR32 Architecture
+
+ config AT32AP700X_WDT
+--- a/drivers/watchdog/Makefile
++++ b/drivers/watchdog/Makefile
+@@ -53,6 +53,7 @@ obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3
+ obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
+ obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
+ obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
++obj-$(CONFIG_FA_WATCHDOG) += fa_wdt.o
+
+ # AVR32 Architecture
+ obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
+--- /dev/null
++++ b/drivers/watchdog/fa_wdt.c
+@@ -0,0 +1,413 @@
++/*
++ * Watchdog driver for SoCs based on the Faraday FA526 core
++ *
++ * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
++ * Copyright (C) 2010-2012 Gabor Juhos <juhosg@openwrt.org>
++ *
++ * 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/module.h>
++#include <linux/init.h>
++#include <linux/io.h>
++#include <linux/fs.h>
++#include <linux/notifier.h>
++#include <linux/reboot.h>
++#include <linux/uaccess.h>
++#include <linux/miscdevice.h>
++#include <linux/platform_device.h>
++#include <linux/watchdog.h>
++#include <linux/slab.h>
++#include <linux/fa_wdt.h>
++
++#define FA_WDCOUNTER 0x0
++#define FA_WDLOAD 0x4
++#define FA_WDRESTART 0x8
++
++#define WDRESTART_MAGIC 0x5AB9
++
++#define FA_WDCR 0xC
++
++#define WDCR_CLOCK_5MHZ (1 << 4)
++#define WDCR_SYS_RST (1 << 1)
++#define WDCR_ENABLE (1 << 0)
++
++#define WDT_DEFAULT_TIMEOUT 13
++
++/* 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(fa_wdt_lock);
++
++static struct platform_device *fa_wdt_dev;
++
++struct fa_wdt_struct {
++ struct resource *res;
++ struct device *dev;
++ void __iomem *base;
++ unsigned long status;
++ unsigned int clock;
++ unsigned int max_timeout;
++};
++
++static const struct watchdog_info fa_wdt_info = {
++ .identity = "Faraday watchdog",
++ .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
++ WDIOF_SETTIMEOUT,
++};
++
++/* Disable the watchdog. */
++static void fa_wdt_stop(struct fa_wdt_struct *fa_wdt)
++{
++ spin_lock(&fa_wdt_lock);
++
++ __raw_writel(0, fa_wdt->base + FA_WDCR);
++
++ clear_bit(WDT_ACTIVE, &fa_wdt->status);
++
++ spin_unlock(&fa_wdt_lock);
++}
++
++/* Service the watchdog */
++static void fa_wdt_service(struct fa_wdt_struct *fa_wdt)
++{
++ __raw_writel(WDRESTART_MAGIC, fa_wdt->base + FA_WDRESTART);
++}
++
++/* Enable and reset the watchdog. */
++static void fa_wdt_start(struct fa_wdt_struct *fa_wdt)
++{
++ spin_lock(&fa_wdt_lock);
++
++ __raw_writel(timeout * fa_wdt->clock,
++ fa_wdt->base + FA_WDLOAD);
++
++ fa_wdt_service(fa_wdt);
++
++ /* set clock before enabling */
++ __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST,
++ fa_wdt->base + FA_WDCR);
++
++ __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST | WDCR_ENABLE,
++ fa_wdt->base + FA_WDCR);
++
++ set_bit(WDT_ACTIVE, &fa_wdt->status);
++
++ spin_unlock(&fa_wdt_lock);
++}
++
++/* Watchdog device is opened, and watchdog starts running. */
++static int fa_wdt_open(struct inode *inode, struct file *file)
++{
++ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(fa_wdt_dev);
++
++ if (test_bit(WDT_ACTIVE, &fa_wdt->status))
++ return -EBUSY;
++
++ file->private_data = fa_wdt;
++
++ fa_wdt_start(fa_wdt);
++
++ return nonseekable_open(inode, file);
++}
++
++/* Close the watchdog device. */
++static int fa_wdt_close(struct inode *inode, struct file *file)
++{
++ struct fa_wdt_struct *fa_wdt = file->private_data;
++
++ /* Disable the watchdog if possible */
++ if (test_bit(WDT_OK_TO_CLOSE, &fa_wdt->status))
++ fa_wdt_stop(fa_wdt);
++ else
++ dev_warn(fa_wdt->dev, "Device closed unexpectedly - timer will not stop\n");
++
++ return 0;
++}
++
++/* Handle commands from user-space. */
++static long fa_wdt_ioctl(struct file *file, unsigned int cmd,
++ unsigned long arg)
++{
++ struct fa_wdt_struct *fa_wdt = file->private_data;
++
++ int value;
++
++ switch (cmd) {
++ case WDIOC_KEEPALIVE:
++ fa_wdt_service(fa_wdt);
++ return 0;
++
++ case WDIOC_GETSUPPORT:
++ return copy_to_user((struct watchdog_info *)arg, &fa_wdt_info,
++ sizeof(fa_wdt_info)) ? -EFAULT : 0;
++
++ case WDIOC_SETTIMEOUT:
++ if (get_user(value, (int *)arg))
++ return -EFAULT;
++
++ if ((value < 1) || (value > fa_wdt->max_timeout))
++ return -EINVAL;
++
++ timeout = value;
++
++ /* restart wdt to use new timeout */
++ fa_wdt_stop(fa_wdt);
++ fa_wdt_start(fa_wdt);
++
++ /* Fall through */
++ case WDIOC_GETTIMEOUT:
++ return put_user(timeout, (int *)arg);
++
++ case WDIOC_GETTIMELEFT:
++ value = __raw_readl(fa_wdt->base + FA_WDCOUNTER);
++ return put_user(value / fa_wdt->clock, (int *)arg);
++
++ default:
++ return -ENOTTY;
++ }
++}
++
++/* Refresh the watchdog whenever device is written to. */
++static ssize_t fa_wdt_write(struct file *file, const char *data,
++ size_t len, loff_t *ppos)
++{
++ struct fa_wdt_struct *fa_wdt = file->private_data;
++
++ if (len) {
++ if (!nowayout) {
++ size_t i;
++
++ clear_bit(WDT_OK_TO_CLOSE, &fa_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,
++ &fa_wdt->status);
++ }
++ }
++ fa_wdt_service(fa_wdt);
++ }
++
++ return len;
++}
++
++static int fa_wdt_notify_sys(struct notifier_block *this,
++ unsigned long code, void *unused)
++{
++ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(fa_wdt_dev);
++
++ if (code == SYS_DOWN || code == SYS_HALT)
++ fa_wdt_stop(fa_wdt);
++
++ return NOTIFY_DONE;
++}
++
++static struct notifier_block fa_wdt_notifier = {
++ .notifier_call = fa_wdt_notify_sys,
++};
++
++static const struct file_operations fa_wdt_fops = {
++ .owner = THIS_MODULE,
++ .llseek = no_llseek,
++ .unlocked_ioctl = fa_wdt_ioctl,
++ .open = fa_wdt_open,
++ .release = fa_wdt_close,
++ .write = fa_wdt_write,
++};
++
++static struct miscdevice fa_wdt_miscdev = {
++ .minor = WATCHDOG_MINOR,
++ .name = "watchdog",
++ .fops = &fa_wdt_fops,
++};
++
++static void fa_wdt_shutdown(struct platform_device *pdev)
++{
++ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
++
++ fa_wdt_stop(fa_wdt);
++}
++
++static int __devinit fa_wdt_probe(struct platform_device *pdev)
++{
++ int ret;
++ int res_size;
++ struct resource *res;
++ void __iomem *base;
++ struct fa_wdt_struct *fa_wdt;
++ struct fa_wdt_platform_data *pdata;
++
++ pdata = pdev->dev.platform_data;
++ if (!pdata) {
++ dev_err(&pdev->dev, "no platform data specified\n");
++ return -EINVAL;
++ }
++
++ if (!pdata->clock) {
++ dev_err(&pdev->dev, "invalid clock value\n");
++ return -EINVAL;
++ }
++
++ 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;
++ }
++
++ fa_wdt = kzalloc(sizeof(struct fa_wdt_struct), GFP_KERNEL);
++ if (!fa_wdt) {
++ dev_err(&pdev->dev, "can't allocate interface\n");
++ ret = -ENOMEM;
++ goto fail1;
++ }
++
++ /* Setup fa_wdt driver structure */
++ fa_wdt->base = base;
++ fa_wdt->res = res;
++ fa_wdt->dev = &pdev->dev;
++ fa_wdt->clock = pdata->clock;
++ fa_wdt->max_timeout = 0xffffffffU / pdata->clock;
++
++ /* Set up platform driver data */
++ platform_set_drvdata(pdev, fa_wdt);
++ fa_wdt_dev = pdev;
++
++ if (fa_wdt_miscdev.parent) {
++ ret = -EBUSY;
++ goto fail2;
++ }
++
++ ret = register_reboot_notifier(&fa_wdt_notifier);
++ if (ret)
++ goto fail2;
++
++ fa_wdt_miscdev.parent = &pdev->dev;
++
++ ret = misc_register(&fa_wdt_miscdev);
++ if (ret)
++ goto fail3;
++
++ return 0;
++
++fail3:
++ unregister_reboot_notifier(&fa_wdt_notifier);
++fail2:
++ platform_set_drvdata(pdev, NULL);
++ kfree(fa_wdt);
++fail1:
++ iounmap(base);
++fail0:
++ release_mem_region(res->start, res_size);
++
++ return ret;
++}
++
++static int __devexit fa_wdt_remove(struct platform_device *pdev)
++{
++ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
++
++ platform_set_drvdata(pdev, NULL);
++ misc_deregister(&fa_wdt_miscdev);
++ unregister_reboot_notifier(&fa_wdt_notifier);
++ fa_wdt_dev = NULL;
++ iounmap(fa_wdt->base);
++ release_mem_region(fa_wdt->res->start, resource_size(fa_wdt->res));
++
++ kfree(fa_wdt);
++
++ return 0;
++}
++
++#ifdef CONFIG_PM
++static int fa_wdt_suspend(struct platform_device *pdev, pm_message_t message)
++{
++ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
++ unsigned int reg;
++
++ reg = __raw_readw(fa_wdt->base + FA_WDCR);
++ reg &= ~(WDCR_WDENABLE);
++ __raw_writel(reg, fa_wdt->base + FA_WDCR);
++
++ return 0;
++}
++
++static int fa_wdt_resume(struct platform_device *pdev)
++{
++ struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
++ unsigned int reg;
++
++ if (fa_wdt->status) {
++ reg = __raw_readw(fa_wdt->base + FA_WDCR);
++ reg |= WDCR_WDENABLE;
++ __raw_writel(reg, fa_wdt->base + FA_WDCR);
++ }
++
++ return 0;
++}
++#else
++#define fa_wdt_suspend NULL
++#define fa_wdt_resume NULL
++#endif
++
++static struct platform_driver fa_wdt_driver = {
++ .probe = fa_wdt_probe,
++ .remove = __devexit_p(fa_wdt_remove),
++ .shutdown = fa_wdt_shutdown,
++ .suspend = fa_wdt_suspend,
++ .resume = fa_wdt_resume,
++ .driver = {
++ .name = "fa-wdt",
++ .owner = THIS_MODULE,
++ },
++};
++
++static int __init fa_wdt_init(void)
++{
++ return platform_driver_probe(&fa_wdt_driver, fa_wdt_probe);
++}
++
++static void __exit fa_wdt_exit(void)
++{
++ platform_driver_unregister(&fa_wdt_driver);
++}
++
++module_init(fa_wdt_init);
++module_exit(fa_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_AUTHOR("Gabor Juhos");
++MODULE_DESCRIPTION("Watchdog driver for Faraday FA526 based SoCs");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
++MODULE_ALIAS("platform:fa-wdt");
+--- /dev/null
++++ b/include/linux/fa_wdt.h
+@@ -0,0 +1,13 @@
++/*
++ * Platform data definition for the Faraday watchdog driver
++ */
++
++#ifndef _FA_WDT_H
++#define _FA_WDT_H
++
++struct fa_wdt_platform_data {
++ unsigned int clock;
++};
++
++#endif /* _FA_WDT_H */
++
generated by cgit v1.2.3 (git 2.46.0) at 2024-12-27 13:06:48 +0000