Inital pcf50606 support

3 files changed, 231 insertions, 0 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b1ccc04f3c9..618cc10acc6 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -154,6 +154,13 @@ config S3C2410_WATCHDOG
 	  The driver can be built as a module by choosing M, and will
 	  be called s3c2410_wdt
 
+config PCF50606_WATCHDOG
+	depends on MFD_PCF50606
+	tristate "Philips PCF50606 watchdog"
+	help
+	  If you say yes here you get support for the Philips PCF50606
+	  PMU's watchdog.
+
 config SA1100_WATCHDOG
 	tristate "SA1100/PXA2xx watchdog"
 	depends on ARCH_SA1100 || ARCH_PXA
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 3d774294a2b..638e1c1d743 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_IXP2000_WATCHDOG) += ixp2000_wdt.o
 obj-$(CONFIG_IXP4XX_WATCHDOG) += ixp4xx_wdt.o
 obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o
 obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
+obj-$(CONFIG_PCF50606_WATCHDOG) += pcf50606_wdt.o
 obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
 obj-$(CONFIG_MPCORE_WATCHDOG) += mpcore_wdt.o
 obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_wdt.o
diff --git a/drivers/watchdog/pcf50606_wdt.c b/drivers/watchdog/pcf50606_wdt.c
new file mode 100644
index 00000000000..f0858747bf9
--- /dev/null
+++ b/drivers/watchdog/pcf50606_wdt.c
@@ -0,0 +1,223 @@
+/* Philips PCF50606 Watchdog Timer Driver
+ *
+ * (C) 2006-2008 by Openmoko, Inc.
+ * Author: Balaji Rao <balajirrao@openmoko.org>
+ * All rights reserved.
+ *
+ * Broken down from monstrous PCF50606 driver mainly by
+ * Harald Welte, Matt Hsu, Andy Green and Werner Almesberger
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/err.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/pcf50606/core.h>
+
+static struct pcf50606 *pcf = NULL;
+static unsigned long wdt_status;
+
+#define WDT_IN_USE        0
+#define WDT_OK_TO_CLOSE   1
+#define WDT_REGION_INITED 2
+#define WDT_DEVICE_INITED 3
+
+static int allow_close;
+#define CLOSE_STATE_NOT		0x0000
+#define CLOSE_STATE_ALLOW	0x2342
+
+#define PCF50606_REG_OOCC1 	0x08
+#define PCF50606_REG_OOCS 	0x01
+
+#define PCF50606_OOCS_WDTEXP 	0x80
+#define PCF50606_OOCC1_WDTRST 	0x08
+
+static void pcf50606_wdt_start(void)
+{
+	pcf50606_reg_set_bit_mask(pcf, PCF50606_REG_OOCC1, PCF50606_OOCC1_WDTRST,
+			 PCF50606_OOCC1_WDTRST);
+}
+
+static void pcf50606_wdt_stop(void)
+{
+	pcf50606_reg_clear_bits(pcf, PCF50606_REG_OOCS, PCF50606_OOCS_WDTEXP);
+}
+
+static void pcf50606_wdt_keepalive(void)
+{
+	pcf50606_wdt_start();
+}
+
+static int pcf50606_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(WDT_IN_USE, &wdt_status))
+		return -EBUSY;
+
+	pcf50606_wdt_start();
+
+	return nonseekable_open(inode, file);
+}
+
+static int pcf50606_wdt_release(struct inode *inode, struct file *file)
+{
+	if (allow_close == CLOSE_STATE_ALLOW)
+		pcf50606_wdt_stop();
+	else {
+		printk(KERN_CRIT "Unexpected close, not stopping watchdog!\n");
+		pcf50606_wdt_keepalive();
+	}
+
+	allow_close = CLOSE_STATE_NOT;
+	clear_bit(WDT_IN_USE, &wdt_status);
+
+	return 0;
+}
+
+static ssize_t pcf50606_wdt_write(struct file *file, const char __user *data,
+				  size_t len, loff_t *ppos)
+{
+	if (len) {
+		size_t i;
+
+		for (i = 0; i != len; i++) {
+			char c;
+			if (get_user(c, data + i))
+				return -EFAULT;
+			if (c == 'V')
+				allow_close = CLOSE_STATE_ALLOW;
+		}
+		pcf50606_wdt_keepalive();
+	}
+
+	return len;
+}
+
+static struct watchdog_info pcf50606_wdt_ident = {
+	.options	= WDIOF_MAGICCLOSE,
+	.firmware_version = 0,
+	.identity	= "PCF50606 Watchdog",
+};
+
+static int pcf50606_wdt_ioctl(struct inode *inode, struct file *file,
+			      unsigned int cmd, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		return copy_to_user(argp, &pcf50606_wdt_ident,
+				    sizeof(pcf50606_wdt_ident)) ? -EFAULT : 0;
+		break;
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, p);
+	case WDIOC_KEEPALIVE:
+		pcf50606_wdt_keepalive();
+		return 0;
+	case WDIOC_GETTIMEOUT:
+		return put_user(8, p);
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+static struct file_operations pcf50606_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= &pcf50606_wdt_write,
+	.ioctl		= &pcf50606_wdt_ioctl,
+	.open		= &pcf50606_wdt_open,
+	.release	= &pcf50606_wdt_release,
+};
+
+static struct miscdevice pcf50606_wdt_miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= "watchdog",
+	.fops		= &pcf50606_wdt_fops,
+};
+
+static void pcf50606_wdt_irq(int irq, void *unused)
+{
+	pcf50606_reg_set_bit_mask(pcf, PCF50606_REG_OOCC1,
+				 PCF50606_OOCC1_WDTRST,
+				 PCF50606_OOCC1_WDTRST);
+}
+
+int __init pcf50606_wdt_probe(struct platform_device *pdev)
+{
+	struct pcf50606_subdev_pdata *pdata;
+	int err;
+
+	if (pcf) {
+		dev_err(pcf->dev, "Only one instance of WDT supported\n");
+		return -ENODEV;
+	}
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "No platform data available\n");
+		return -EINVAL;
+	}
+
+	pcf = pdata->pcf;
+
+	err = misc_register(&pcf50606_wdt_miscdev);
+	if (err) {
+		dev_err(&pdev->dev, "cannot register miscdev on "
+		       "minor=%d (%d)\n", WATCHDOG_MINOR, err);
+		return err;
+	}
+	set_bit(WDT_DEVICE_INITED, &wdt_status);
+
+	pcf50606_register_irq(pcf, PCF50606_IRQ_CHGWD10S, pcf50606_wdt_irq, NULL);
+
+	return 0;
+}
+
+static int __devexit pcf50606_wdt_remove(struct platform_device *pdev)
+{
+	pcf50606_free_irq(pcf, PCF50606_IRQ_CHGWD10S);
+	misc_deregister(&pcf50606_wdt_miscdev);
+	pcf = NULL;
+
+	return 0;
+}
+
+struct platform_driver pcf50606_wdt_driver = {
+	.driver = {
+		.name = "pcf50606-wdt",
+	},
+	.probe = pcf50606_wdt_probe,
+	.remove = __devexit_p(pcf50606_wdt_remove),
+};
+
+static int __init pcf50606_wdt_init(void)
+{
+		return platform_driver_register(&pcf50606_wdt_driver);
+}
+module_init(pcf50606_wdt_init);
+
+static void __exit pcf50606_wdt_exit(void)
+{
+		platform_driver_unregister(&pcf50606_wdt_driver);
+}
+module_exit(pcf50606_wdt_exit);
+
+MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
+MODULE_DESCRIPTION("PCF50606 wdt driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pcf50606-wdt");
+