--- /dev/null
+--- a/arch/arm/mach-sl2312/sl3516_device.c
++++ b/arch/arm/mach-sl2312/sl3516_device.c
+@@ -76,9 +76,30 @@
+ .resource = sl3516_sata0_resources,
+ };
+
++static struct resource sl351x_wdt_resources[] = {
++ [0] = {
++ .start = SL2312_WAQTCHDOG_BASE + 0x00,
++ .end = SL2312_WAQTCHDOG_BASE + 0x1C,
++ .flags = IORESOURCE_MEM,
++ },
++ [1] = {
++ .start = IRQ_WATCHDOG,
++ .end = IRQ_WATCHDOG,
++ .flags = IORESOURCE_IRQ,
++ },
++};
++
++static struct platform_device sl351x_wdt = {
++ .name = "sl351x-wdt",
++ .id = -1,
++ .resource = sl351x_wdt_resources,
++ .num_resources = ARRAY_SIZE(sl351x_wdt_resources),
++};
++
+ static struct platform_device *sata_devices[] __initdata = {
+ &sata_device,
+ &sata0_device,
++ &sl351x_wdt,
+ };
+
+ static int __init sl3516_init(void)
+--- a/drivers/char/watchdog/Kconfig
++++ b/drivers/char/watchdog/Kconfig
+@@ -171,6 +171,17 @@
+ To compile this driver as a module, choose M here: the
+ module will be called ep93xx_wdt.
+
++config WATCHDOG_SL351X
++ tristate "SL351x Watchdog"
++ depends on WATCHDOG && ARCH_SL2312
++ help
++ This driver adds watchdog support for the integrated watchdog in the
++ SL351x processors (Farraday core). If you have one of these processors
++ and wish to have watchdog support enabled, say Y, otherwise say N.
++
++ To compile this driver as a module, choose M here: the
++ module will be called sl351x_wdt.
++
+ config OMAP_WATCHDOG
+ tristate "OMAP Watchdog"
+ depends on ARCH_OMAP16XX || ARCH_OMAP24XX
+--- a/drivers/char/watchdog/Makefile
++++ b/drivers/char/watchdog/Makefile
+@@ -36,6 +36,7 @@
+ obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
+ obj-$(CONFIG_MPCORE_WATCHDOG) += mpcore_wdt.o
+ obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_wdt.o
++obj-$(CONFIG_WATCHDOG_SL351X) += sl351x_wdt.o
+ obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
+ obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o
+ obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
+--- /dev/null
++++ b/drivers/char/watchdog/sl351x_wdt.c
+@@ -0,0 +1,332 @@
++#include <linux/module.h>
++#include <linux/types.h>
++#include <linux/fs.h>
++#include <linux/mm.h>
++#include <linux/errno.h>
++#include <linux/init.h>
++#include <linux/miscdevice.h>
++#include <linux/watchdog.h>
++#include <linux/platform_device.h>
++#include <asm/uaccess.h>
++#include <asm/arch/sl2312.h>
++#include <asm/arch/hardware.h>
++#include <asm/arch/irqs.h>
++#include <asm/arch/watchdog.h>
++#include <asm/io.h>
++#include <linux/interrupt.h>
++
++#define WATCHDOG_TEST 1
++#define PFX "sl351x-wdt: "
++
++#define _WATCHDOG_COUNTER 0x00
++#define _WATCHDOG_LOAD 0x04
++#define _WATCHDOG_RESTART 0x08
++#define _WATCHDOG_CR 0x0C
++#define _WATCHDOG_STATUS 0x10
++#define _WATCHDOG_CLEAR 0x14
++#define _WATCHDOG_INTRLEN 0x18
++
++static struct resource *wdt_mem;
++static struct resource *wdt_irq;
++static void __iomem *wdt_base;
++static int wdt_margin = WATCHDOG_TIMEOUT_MARGIN; /* in range of 0 .. 60s */
++
++static int open_state = WATCHDOG_DRIVER_CLOSE;
++static int wd_expire = 0;
++
++static void watchdog_enable(void)
++{
++ unsigned long wdcr;
++
++ wdcr = readl(wdt_base + _WATCHDOG_CR);
++ wdcr |= (WATCHDOG_WDENABLE_MSK|WATCHDOG_WDRST_MSK);
++#ifdef WATCHDOG_TEST
++ wdcr |= WATCHDOG_WDINTR_MSK;
++// wdcr &= ~WATCHDOG_WDRST_MSK;
++#endif
++ wdcr &= ~WATCHDOG_WDCLOCK_MSK;
++ writel(wdcr, wdt_base + _WATCHDOG_CR);
++}
++
++static void watchdog_set_timeout(unsigned long timeout)
++{
++ timeout = WATCHDOG_TIMEOUT_SCALE * timeout;
++ writel(timeout, wdt_base + _WATCHDOG_LOAD);
++ writel(WATCHDOG_RESTART_VALUE, wdt_base + _WATCHDOG_RESTART);
++}
++
++static void watchdog_keepalive(void)
++{
++ writel(WATCHDOG_RESTART_VALUE, wdt_base + _WATCHDOG_RESTART);
++}
++
++static void watchdog_disable(void)
++{
++ unsigned long wdcr;
++
++ wdcr = readl(wdt_base + _WATCHDOG_CR);
++ wdcr &= ~WATCHDOG_WDENABLE_MSK;
++ writel(wdcr, wdt_base + _WATCHDOG_CR);
++}
++
++
++#ifdef WATCHDOG_TEST
++static irqreturn_t watchdog_irq(int irq, void *dev_id, struct pt_regs *regs)
++{
++ unsigned int clear;
++
++ writel(WATCHDOG_CLEAR_STATUS, wdt_base + _WATCHDOG_CLEAR);
++ printk(KERN_INFO PFX "Watchdog timeout, resetting system...\n");
++
++ clear = __raw_readl(IO_ADDRESS(SL2312_INTERRUPT_BASE)+0x0C);
++ clear &= 0x01;
++ __raw_writel(clear,IO_ADDRESS(SL2312_INTERRUPT_BASE)+0x08);
++ wd_expire = 1;
++ return IRQ_HANDLED;
++}
++
++#endif
++
++#define OPTIONS WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE
++static struct watchdog_info sl351x_wdt_ident = {
++ .options = OPTIONS,
++ .firmware_version = 0,
++ .identity = "sl351x Watchdog",
++};
++
++struct file_operations watchdog_fops = {
++ .write = watchdog_write,
++ .read = watchdog_read,
++ .open = watchdog_open,
++ .release = watchdog_release,
++ .ioctl = watchdog_ioctl,
++};
++
++static int watchdog_open(struct inode *inode, struct file *filp)
++{
++ if (open_state == WATCHDOG_DRIVER_OPEN)
++ return -EBUSY;
++
++ wd_expire = 0;
++
++ watchdog_disable();
++ watchdog_set_timeout(wdt_margin);
++ watchdog_enable();
++
++ printk(KERN_INFO PFX "watchog timer enabled, margin: %ds.\n", wdt_margin);
++ open_state = WATCHDOG_DRIVER_OPEN;
++
++ return nonseekable_open(inode, filp);
++}
++
++static int watchdog_release(struct inode *inode, struct file *filp)
++{
++ watchdog_disable();
++
++ open_state = WATCHDOG_DRIVER_CLOSE;
++ wd_expire = 0;
++ printk(KERN_INFO PFX "watchog timer disabled, margin: %ds.\n", wdt_margin);
++
++ return 0;
++}
++
++static ssize_t watchdog_read(struct file *filp, char *buf, size_t count, loff_t *off)
++{
++ int i;
++ unsigned long val;
++
++
++ for(i=0;i< count;i++)
++ {
++ if ((i%4)==0)
++ val = *((unsigned long *)WATCHDOG_COUNTER);
++ buf[i] = (val & 0xFF);
++ val >>= 8;
++ }
++ return count;
++}
++
++static ssize_t watchdog_write(struct file *filp, const char *buf, size_t len, loff_t *off)
++{
++ /* Refresh the timer. */
++ if (len) {
++ watchdog_keepalive();
++ }
++ return len;
++
++}
++
++static int watchdog_ioctl(struct inode *inode, struct file *filp,
++ unsigned int cmd, unsigned long arg)
++{
++ void __user *argp = (void __user *)arg;
++ int margin;
++
++ switch(cmd)
++ {
++ case WDIOC_GETSUPPORT:
++ return copy_to_user(argp, &sl351x_wdt_ident,
++ sizeof(sl351x_wdt_ident)) ? -EFAULT : 0;
++
++ case WDIOC_GETSTATUS:
++ case WDIOC_GETBOOTSTATUS:
++ return put_user(0, (int __user*)argp);
++
++ case WDIOC_KEEPALIVE:
++ watchdog_keepalive();
++ return 0;
++
++ case WDIOC_SETTIMEOUT:
++ if (get_user(margin, (int __user*)argp))
++ return -EFAULT;
++
++ /* Arbitrary, can't find the card's limits */
++ if ((margin < 0) || (margin > 60))
++ return -EINVAL;
++
++ // watchdog_disable();
++ wdt_margin = margin;
++ watchdog_set_timeout(margin);
++ watchdog_keepalive();
++ // watchdog_enable();
++
++ /* Fall through */
++
++ case WDIOC_GETTIMEOUT:
++ return put_user(wdt_margin, (int *)arg);
++
++ default:
++ return -ENOIOCTLCMD;
++ }
++}
++
++static struct miscdevice wd_dev= {
++ WATCHDOG_MINOR,
++ "watchdog",
++ &watchdog_fops
++};
++
++static char banner[] __initdata = KERN_INFO "SL351x Watchdog Timer, (c) 2007 WILIBOX\n";
++
++static int sl351x_wdt_probe(struct platform_device *pdev)
++{
++ struct resource *res;
++ int ret, size;
++ unsigned long wdcr;
++
++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if (res == NULL) {
++ printk(KERN_INFO PFX "failed to get memory region resouce\n");
++ return -ENOMEM;
++ }
++
++ size = (res->end-res->start)+1;
++
++ wdt_mem = request_mem_region(res->start, size, pdev->name);
++ if (wdt_mem == NULL) {
++ printk(KERN_INFO PFX "failed to get memory region\n");
++ return -ENOENT;
++ }
++
++ wdt_base = ioremap(res->start, size);
++ if (wdt_base == NULL) {
++ printk(KERN_INFO PFX "failed to ioremap() region\n");
++ return -EINVAL;
++ }
++
++ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
++ if (res == NULL) {
++ printk(KERN_INFO PFX "failed to get irq resource\n");
++ return -ENOENT;
++ }
++
++ wdt_irq = res;
++
++ ret = request_irq(res->start, watchdog_irq, 0, pdev->name, pdev);
++ if (ret != 0) {
++ printk(KERN_INFO PFX "failed to install irq (%d)\n", ret);
++ return ret;
++ }
++
++ wdcr = readl(wdt_base + _WATCHDOG_CR);
++ if (wdcr & WATCHDOG_WDENABLE_MSK) {
++ printk(KERN_INFO PFX "Found watchdog in enabled state, reseting ...\n");
++ wdcr &= ~WATCHDOG_WDENABLE_MSK;
++ writel(wdcr, wdt_base + _WATCHDOG_CR);
++ }
++
++ ret = misc_register(&wd_dev);
++
++ return ret;
++}
++
++static int sl351x_wdt_remove(struct platform_device *pdev)
++{
++ if (wdt_base != NULL) {
++ iounmap(wdt_base);
++ wdt_base = NULL;
++ }
++
++ if (wdt_irq != NULL) {
++ free_irq(wdt_irq->start, pdev);
++ release_resource(wdt_irq);
++ wdt_irq = NULL;
++ }
++
++ if (wdt_mem != NULL) {
++ release_resource(wdt_mem);
++ wdt_mem = NULL;
++ }
++
++ misc_deregister(&wd_dev);
++
++ return 0;
++}
++
++static void sl351x_wdt_shutdown(struct platform_device *dev)
++{
++ watchdog_disable();
++}
++
++#ifdef CONFIG_PM
++static int sl351x_wdt_suspend(struct platform_device *dev, pm_message_t state)
++{
++ watchdog_disable();
++}
++
++static int sl351x_wdt_resume(struct platform_device *dev)
++{
++ watchdog_set_timeout(wdt_margin);
++ watchdog_enable();
++}
++
++#else
++#define sl351x_wdt_suspend NULL
++#define sl351x_wdt_resume NULL
++#endif
++
++static struct platform_driver sl351x_wdt_driver = {
++ .probe = sl351x_wdt_probe,
++ .remove = sl351x_wdt_remove,
++ .shutdown = sl351x_wdt_shutdown,
++ .suspend = sl351x_wdt_suspend,
++ .resume = sl351x_wdt_resume,
++ .driver = {
++ .owner = THIS_MODULE,
++ .name = "sl351x-wdt",
++ },
++};
++
++static int __init watchdog_init(void)
++{
++ printk(banner);
++ return platform_driver_register(&sl351x_wdt_driver);
++}
++
++static void __exit watchdog_exit(void)
++{
++ platform_driver_unregister(&sl351x_wdt_driver);
++}
++
++module_init(watchdog_init);
++module_exit(watchdog_exit);
projects / openwrt / openwrt.git / blobdiff