[PATCH] RTC subsystem: VR41XX driver

This patch updates VR4100 series RTC driver.

* This driver supports new RTC subsystem.
* Simple set time/read time test worked fine.

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 717 deletions

diff --git a/drivers/char/vr41xx_rtc.c b/drivers/char/vr41xx_rtc.c
deleted file mode 100644
index b109d9a502d6..000000000000
--- a/drivers/char/vr41xx_rtc.c
+++ /dev/null
@@ -1,717 +0,0 @@
-/*
- *  Driver for NEC VR4100 series  Real Time Clock unit.
- *
- *  Copyright (C) 2003-2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
- *
- *  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.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-#include <linux/platform_device.h>
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <linux/ioport.h>
-#include <linux/irq.h>
-#include <linux/mc146818rtc.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/poll.h>
-#include <linux/rtc.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-#include <linux/wait.h>
-
-#include <asm/div64.h>
-#include <asm/io.h>
-#include <asm/time.h>
-#include <asm/uaccess.h>
-#include <asm/vr41xx/vr41xx.h>
-
-MODULE_AUTHOR("Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>");
-MODULE_DESCRIPTION("NEC VR4100 series RTC driver");
-MODULE_LICENSE("GPL");
-
-#define RTC1_TYPE1_START	0x0b0000c0UL
-#define RTC1_TYPE1_END		0x0b0000dfUL
-#define RTC2_TYPE1_START	0x0b0001c0UL
-#define RTC2_TYPE1_END		0x0b0001dfUL
-
-#define RTC1_TYPE2_START	0x0f000100UL
-#define RTC1_TYPE2_END		0x0f00011fUL
-#define RTC2_TYPE2_START	0x0f000120UL
-#define RTC2_TYPE2_END		0x0f00013fUL
-
-#define RTC1_SIZE		0x20
-#define RTC2_SIZE		0x20
-
-/* RTC 1 registers */
-#define ETIMELREG		0x00
-#define ETIMEMREG		0x02
-#define ETIMEHREG		0x04
-/* RFU */
-#define ECMPLREG		0x08
-#define ECMPMREG		0x0a
-#define ECMPHREG		0x0c
-/* RFU */
-#define RTCL1LREG		0x10
-#define RTCL1HREG		0x12
-#define RTCL1CNTLREG		0x14
-#define RTCL1CNTHREG		0x16
-#define RTCL2LREG		0x18
-#define RTCL2HREG		0x1a
-#define RTCL2CNTLREG		0x1c
-#define RTCL2CNTHREG		0x1e
-
-/* RTC 2 registers */
-#define TCLKLREG		0x00
-#define TCLKHREG		0x02
-#define TCLKCNTLREG		0x04
-#define TCLKCNTHREG		0x06
-/* RFU */
-#define RTCINTREG		0x1e
- #define TCLOCK_INT		0x08
- #define RTCLONG2_INT		0x04
- #define RTCLONG1_INT		0x02
- #define ELAPSEDTIME_INT	0x01
-
-#define RTC_FREQUENCY		32768
-#define MAX_PERIODIC_RATE	6553
-#define MAX_USER_PERIODIC_RATE	64
-
-static void __iomem *rtc1_base;
-static void __iomem *rtc2_base;
-
-#define rtc1_read(offset)		readw(rtc1_base + (offset))
-#define rtc1_write(offset, value)	writew((value), rtc1_base + (offset))
-
-#define rtc2_read(offset)		readw(rtc2_base + (offset))
-#define rtc2_write(offset, value)	writew((value), rtc2_base + (offset))
-
-static unsigned long epoch = 1970;	/* Jan 1 1970 00:00:00 */
-
-static spinlock_t rtc_task_lock;
-static wait_queue_head_t rtc_wait;
-static unsigned long rtc_irq_data;
-static struct fasync_struct *rtc_async_queue;
-static rtc_task_t *rtc_callback;
-static char rtc_name[] = "RTC";
-static unsigned long periodic_frequency;
-static unsigned long periodic_count;
-
-typedef enum {
-	RTC_RELEASE,
-	RTC_OPEN,
-} rtc_status_t;
-
-static rtc_status_t rtc_status;
-
-typedef enum {
-	FUNCTION_RTC_IOCTL,
-	FUNCTION_RTC_CONTROL,
-} rtc_callfrom_t;
-
-struct resource rtc_resource[2] = {
-	{	.name	= rtc_name,
-		.flags	= IORESOURCE_MEM,	},
-	{	.name	= rtc_name,
-		.flags	= IORESOURCE_MEM,	},
-};
-
-static inline unsigned long read_elapsed_second(void)
-{
-	unsigned long first_low, first_mid, first_high;
-	unsigned long second_low, second_mid, second_high;
-
-	do {
-		first_low = rtc1_read(ETIMELREG);
-		first_mid = rtc1_read(ETIMEMREG);
-		first_high = rtc1_read(ETIMEHREG);
-		second_low = rtc1_read(ETIMELREG);
-		second_mid = rtc1_read(ETIMEMREG);
-		second_high = rtc1_read(ETIMEHREG);
-	} while (first_low != second_low || first_mid != second_mid ||
-	         first_high != second_high);
-
-	return (first_high << 17) | (first_mid << 1) | (first_low >> 15);
-}
-
-static inline void write_elapsed_second(unsigned long sec)
-{
-	spin_lock_irq(&rtc_lock);
-
-	rtc1_write(ETIMELREG, (uint16_t)(sec << 15));
-	rtc1_write(ETIMEMREG, (uint16_t)(sec >> 1));
-	rtc1_write(ETIMEHREG, (uint16_t)(sec >> 17));
-
-	spin_unlock_irq(&rtc_lock);
-}
-
-static void set_alarm(struct rtc_time *time)
-{
-	unsigned long alarm_sec;
-
-	alarm_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
-	                   time->tm_hour, time->tm_min, time->tm_sec);
-
-	spin_lock_irq(&rtc_lock);
-
-	rtc1_write(ECMPLREG, (uint16_t)(alarm_sec << 15));
-	rtc1_write(ECMPMREG, (uint16_t)(alarm_sec >> 1));
-	rtc1_write(ECMPHREG, (uint16_t)(alarm_sec >> 17));
-
-	spin_unlock_irq(&rtc_lock);
-}
-
-static void read_alarm(struct rtc_time *time)
-{
-	unsigned long low, mid, high;
-
-	spin_lock_irq(&rtc_lock);
-
-	low = rtc1_read(ECMPLREG);
-	mid = rtc1_read(ECMPMREG);
-	high = rtc1_read(ECMPHREG);
-
-	spin_unlock_irq(&rtc_lock);
-
-	to_tm((high << 17) | (mid << 1) | (low >> 15), time);
-	time->tm_year -= 1900;
-}
-
-static void read_time(struct rtc_time *time)
-{
-	unsigned long epoch_sec, elapsed_sec;
-
-	epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
-	elapsed_sec = read_elapsed_second();
-
-	to_tm(epoch_sec + elapsed_sec, time);
-	time->tm_year -= 1900;
-}
-
-static void set_time(struct rtc_time *time)
-{
-	unsigned long epoch_sec, current_sec;
-
-	epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
-	current_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
-	                     time->tm_hour, time->tm_min, time->tm_sec);
-
-	write_elapsed_second(current_sec - epoch_sec);
-}
-
-static ssize_t rtc_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
-{
-	DECLARE_WAITQUEUE(wait, current);
-	unsigned long irq_data;
-	int retval = 0;
-
-	if (count != sizeof(unsigned int) && count != sizeof(unsigned long))
-		return -EINVAL;
-
-	add_wait_queue(&rtc_wait, &wait);
-
-	do {
-		__set_current_state(TASK_INTERRUPTIBLE);
-
-		spin_lock_irq(&rtc_lock);
-		irq_data = rtc_irq_data;
-		rtc_irq_data = 0;
-		spin_unlock_irq(&rtc_lock);
-
-		if (irq_data != 0)
-			break;
-
-		if (file->f_flags & O_NONBLOCK) {
-			retval = -EAGAIN;
-			break;
-		}
-
-		if (signal_pending(current)) {
-			retval = -ERESTARTSYS;
-			break;
-		}
-	} while (1);
-
-	if (retval == 0) {
-		if (count == sizeof(unsigned int)) {
-			retval = put_user(irq_data, (unsigned int __user *)buf);
-			if (retval == 0)
-				retval = sizeof(unsigned int);
-		} else {
-			retval = put_user(irq_data, (unsigned long __user *)buf);
-			if (retval == 0)
-				retval = sizeof(unsigned long);
-		}
-
-	}
-
-	__set_current_state(TASK_RUNNING);
-	remove_wait_queue(&rtc_wait, &wait);
-
-	return retval;
-}
-
-static unsigned int rtc_poll(struct file *file, struct poll_table_struct *table)
-{
-	poll_wait(file, &rtc_wait, table);
-
-	if (rtc_irq_data != 0)
-		return POLLIN | POLLRDNORM;
-
-	return 0;
-}
-
-static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, rtc_callfrom_t from)
-{
-	struct rtc_time time;
-	unsigned long count;
-
-	switch (cmd) {
-	case RTC_AIE_ON:
-		enable_irq(ELAPSEDTIME_IRQ);
-		break;
-	case RTC_AIE_OFF:
-		disable_irq(ELAPSEDTIME_IRQ);
-		break;
-	case RTC_PIE_ON:
-		enable_irq(RTCLONG1_IRQ);
-		break;
-	case RTC_PIE_OFF:
-		disable_irq(RTCLONG1_IRQ);
-		break;
-	case RTC_ALM_SET:
-		if (copy_from_user(&time, (struct rtc_time __user *)arg,
-		                   sizeof(struct rtc_time)))
-			return -EFAULT;
-
-		set_alarm(&time);
-		break;
-	case RTC_ALM_READ:
-		memset(&time, 0, sizeof(struct rtc_time));
-		read_alarm(&time);
-		break;
-	case RTC_RD_TIME:
-		memset(&time, 0, sizeof(struct rtc_time));
-		read_time(&time);
-		if (copy_to_user((void __user *)arg, &time, sizeof(struct rtc_time)))
-			return -EFAULT;
-		break;
-	case RTC_SET_TIME:
-		if (capable(CAP_SYS_TIME) == 0)
-			return -EACCES;
-
-		if (copy_from_user(&time, (struct rtc_time __user *)arg,
-		                   sizeof(struct rtc_time)))
-			return -EFAULT;
-
-		set_time(&time);
-		break;
-	case RTC_IRQP_READ:
-		return put_user(periodic_frequency, (unsigned long __user *)arg);
-		break;
-	case RTC_IRQP_SET:
-		if (arg > MAX_PERIODIC_RATE)
-			return -EINVAL;
-
-		if (from == FUNCTION_RTC_IOCTL && arg > MAX_USER_PERIODIC_RATE &&
-		    capable(CAP_SYS_RESOURCE) == 0)
-			return -EACCES;
-
-		periodic_frequency = arg;
-
-		count = RTC_FREQUENCY;
-		do_div(count, arg);
-
-		periodic_count = count;
-
-		spin_lock_irq(&rtc_lock);
-
-		rtc1_write(RTCL1LREG, count);
-		rtc1_write(RTCL1HREG, count >> 16);
-
-		spin_unlock_irq(&rtc_lock);
-		break;
-	case RTC_EPOCH_READ:
-		return put_user(epoch, (unsigned long __user *)arg);
-	case RTC_EPOCH_SET:
-		/* Doesn't support before 1900 */
-		if (arg < 1900)
-			return -EINVAL;
-
-		if (capable(CAP_SYS_TIME) == 0)
-			return -EACCES;
-
-		epoch = arg;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-                     unsigned long arg)
-{
-	return rtc_do_ioctl(cmd, arg, FUNCTION_RTC_IOCTL);
-}
-
-static int rtc_open(struct inode *inode, struct file *file)
-{
-	spin_lock_irq(&rtc_lock);
-
-	if (rtc_status == RTC_OPEN) {
-		spin_unlock_irq(&rtc_lock);
-		return -EBUSY;
-	}
-
-	rtc_status = RTC_OPEN;
-	rtc_irq_data = 0;
-
-	spin_unlock_irq(&rtc_lock);
-
-	return 0;
-}
-
-static int rtc_release(struct inode *inode, struct file *file)
-{
-	if (file->f_flags & FASYNC)
-		(void)fasync_helper(-1, file, 0, &rtc_async_queue);
-
-	spin_lock_irq(&rtc_lock);
-
-	rtc1_write(ECMPLREG, 0);
-	rtc1_write(ECMPMREG, 0);
-	rtc1_write(ECMPHREG, 0);
-	rtc1_write(RTCL1LREG, 0);
-	rtc1_write(RTCL1HREG, 0);
-
-	rtc_status = RTC_RELEASE;
-
-	spin_unlock_irq(&rtc_lock);
-
-	disable_irq(ELAPSEDTIME_IRQ);
-	disable_irq(RTCLONG1_IRQ);
-
-	return 0;
-}
-
-static int rtc_fasync(int fd, struct file *file, int on)
-{
-	return fasync_helper(fd, file, on, &rtc_async_queue);
-}
-
-static struct file_operations rtc_fops = {
-	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
-	.read		= rtc_read,
-	.poll		= rtc_poll,
-	.ioctl		= rtc_ioctl,
-	.open		= rtc_open,
-	.release	= rtc_release,
-	.fasync		= rtc_fasync,
-};
-
-static irqreturn_t elapsedtime_interrupt(int irq, void *dev_id, struct pt_regs *regs)
-{
-	spin_lock(&rtc_lock);
-	rtc2_write(RTCINTREG, ELAPSEDTIME_INT);
-
-	rtc_irq_data += 0x100;
-	rtc_irq_data &= ~0xff;
-	rtc_irq_data |= RTC_AF;
-	spin_unlock(&rtc_lock);
-
-	spin_lock(&rtc_lock);
-	if (rtc_callback)
-		rtc_callback->func(rtc_callback->private_data);
-	spin_unlock(&rtc_lock);
-
-	wake_up_interruptible(&rtc_wait);
-
-	kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
-
-	return IRQ_HANDLED;
-}
-
-static irqreturn_t rtclong1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
-{
-	unsigned long count = periodic_count;
-
-	spin_lock(&rtc_lock);
-	rtc2_write(RTCINTREG, RTCLONG1_INT);
-
-	rtc1_write(RTCL1LREG, count);
-	rtc1_write(RTCL1HREG, count >> 16);
-
-	rtc_irq_data += 0x100;
-	rtc_irq_data &= ~0xff;
-	rtc_irq_data |= RTC_PF;
-	spin_unlock(&rtc_lock);
-
-	spin_lock(&rtc_task_lock);
-	if (rtc_callback)
-		rtc_callback->func(rtc_callback->private_data);
-	spin_unlock(&rtc_task_lock);
-
-	wake_up_interruptible(&rtc_wait);
-
-	kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
-
-	return IRQ_HANDLED;
-}
-
-int rtc_register(rtc_task_t *task)
-{
-	if (task == NULL || task->func == NULL)
-		return -EINVAL;
-
-	spin_lock_irq(&rtc_lock);
-	if (rtc_status == RTC_OPEN) {
-		spin_unlock_irq(&rtc_lock);
-		return -EBUSY;
-	}
-
-	spin_lock(&rtc_task_lock);
-	if (rtc_callback != NULL) {
-		spin_unlock(&rtc_task_lock);
-		spin_unlock_irq(&rtc_task_lock);
-		return -EBUSY;
-	}
-
-	rtc_callback = task;
-	spin_unlock(&rtc_task_lock);
-
-	rtc_status = RTC_OPEN;
-
-	spin_unlock_irq(&rtc_lock);
-
-	return 0;
-}
-
-EXPORT_SYMBOL_GPL(rtc_register);
-
-int rtc_unregister(rtc_task_t *task)
-{
-	spin_lock_irq(&rtc_task_lock);
-	if (task == NULL || rtc_callback != task) {
-		spin_unlock_irq(&rtc_task_lock);
-		return -ENXIO;
-	}
-
-	spin_lock(&rtc_lock);
-
-	rtc1_write(ECMPLREG, 0);
-	rtc1_write(ECMPMREG, 0);
-	rtc1_write(ECMPHREG, 0);
-	rtc1_write(RTCL1LREG, 0);
-	rtc1_write(RTCL1HREG, 0);
-
-	rtc_status = RTC_RELEASE;
-
-	spin_unlock(&rtc_lock);
-
-	rtc_callback = NULL;
-
-	spin_unlock_irq(&rtc_task_lock);
-
-	disable_irq(ELAPSEDTIME_IRQ);
-	disable_irq(RTCLONG1_IRQ);
-
-	return 0;
-}
-
-EXPORT_SYMBOL_GPL(rtc_unregister);
-
-int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg)
-{
-	int retval = 0;
-
-	spin_lock_irq(&rtc_task_lock);
-
-	if (rtc_callback != task)
-		retval = -ENXIO;
-	else
-		rtc_do_ioctl(cmd, arg, FUNCTION_RTC_CONTROL);
-
-	spin_unlock_irq(&rtc_task_lock);
-
-	return retval;
-}
-
-EXPORT_SYMBOL_GPL(rtc_control);
-
-static struct miscdevice rtc_miscdevice = {
-	.minor	= RTC_MINOR,
-	.name	= rtc_name,
-	.fops	= &rtc_fops,
-};
-
-static int __devinit rtc_probe(struct platform_device *pdev)
-{
-	unsigned int irq;
-	int retval;
-
-	if (pdev->num_resources != 2)
-		return -EBUSY;
-
-	rtc1_base = ioremap(pdev->resource[0].start, RTC1_SIZE);
-	if (rtc1_base == NULL)
-		return -EBUSY;
-
-	rtc2_base = ioremap(pdev->resource[1].start, RTC2_SIZE);
-	if (rtc2_base == NULL) {
-		iounmap(rtc1_base);
-		rtc1_base = NULL;
-		return -EBUSY;
-	}
-
-	retval = misc_register(&rtc_miscdevice);
-	if (retval < 0) {
-		iounmap(rtc1_base);
-		iounmap(rtc2_base);
-		rtc1_base = NULL;
-		rtc2_base = NULL;
-		return retval;
-	}
-
-	spin_lock_irq(&rtc_lock);
-
-	rtc1_write(ECMPLREG, 0);
-	rtc1_write(ECMPMREG, 0);
-	rtc1_write(ECMPHREG, 0);
-	rtc1_write(RTCL1LREG, 0);
-	rtc1_write(RTCL1HREG, 0);
-
-	rtc_status = RTC_RELEASE;
-	rtc_irq_data = 0;
-
-	spin_unlock_irq(&rtc_lock);
-
-	init_waitqueue_head(&rtc_wait);
-
-	irq = ELAPSEDTIME_IRQ;
-	retval = request_irq(irq, elapsedtime_interrupt, SA_INTERRUPT,
-	                     "elapsed_time", NULL);
-	if (retval == 0) {
-		irq = RTCLONG1_IRQ;
-		retval = request_irq(irq, rtclong1_interrupt, SA_INTERRUPT,
-		                     "rtclong1", NULL);
-	}
-
-	if (retval < 0) {
-		printk(KERN_ERR "rtc: IRQ%d is busy\n", irq);
-		if (irq == RTCLONG1_IRQ)
-			free_irq(ELAPSEDTIME_IRQ, NULL);
-		iounmap(rtc1_base);
-		iounmap(rtc2_base);
-		rtc1_base = NULL;
-		rtc2_base = NULL;
-		return retval;
-	}
-
-	disable_irq(ELAPSEDTIME_IRQ);
-	disable_irq(RTCLONG1_IRQ);
-
-	spin_lock_init(&rtc_task_lock);
-
-	printk(KERN_INFO "rtc: Real Time Clock of NEC VR4100 series\n");
-
-	return 0;
-}
-
-static int __devexit rtc_remove(struct platform_device *dev)
-{
-	int retval;
-
-	retval = misc_deregister(&rtc_miscdevice);
-	if (retval < 0)
-		return retval;
-
-	free_irq(ELAPSEDTIME_IRQ, NULL);
-	free_irq(RTCLONG1_IRQ, NULL);
-	if (rtc1_base != NULL)
-		iounmap(rtc1_base);
-	if (rtc2_base != NULL)
-		iounmap(rtc2_base);
-
-	return 0;
-}
-
-static struct platform_device *rtc_platform_device;
-
-static struct platform_driver rtc_device_driver = {
-	.probe		= rtc_probe,
-	.remove		= __devexit_p(rtc_remove),
-	.driver		= {
-		.name	= rtc_name,
-		.owner	= THIS_MODULE,
-	},
-};
-
-static int __init vr41xx_rtc_init(void)
-{
-	int retval;
-
-	switch (current_cpu_data.cputype) {
-	case CPU_VR4111:
-	case CPU_VR4121:
-		rtc_resource[0].start = RTC1_TYPE1_START;
-		rtc_resource[0].end = RTC1_TYPE1_END;
-		rtc_resource[1].start = RTC2_TYPE1_START;
-		rtc_resource[1].end = RTC2_TYPE1_END;
-		break;
-	case CPU_VR4122:
-	case CPU_VR4131:
-	case CPU_VR4133:
-		rtc_resource[0].start = RTC1_TYPE2_START;
-		rtc_resource[0].end = RTC1_TYPE2_END;
-		rtc_resource[1].start = RTC2_TYPE2_START;
-		rtc_resource[1].end = RTC2_TYPE2_END;
-		break;
-	default:
-		return -ENODEV;
-		break;
-	}
-
-	rtc_platform_device = platform_device_alloc("RTC", -1);
-	if (!rtc_platform_device)
-		return -ENOMEM;
-
-	retval = platform_device_add_resources(rtc_platform_device,
-				rtc_resource, ARRAY_SIZE(rtc_resource));
-
-	if (retval == 0)
-		retval = platform_device_add(rtc_platform_device);
-
-	if (retval < 0) {
-		platform_device_put(rtc_platform_device);
-		return retval;
-	}
-
-	retval = platform_driver_register(&rtc_device_driver);
-	if (retval < 0)
-		platform_device_unregister(rtc_platform_device);
-
-	return retval;
-}
-
-static void __exit vr41xx_rtc_exit(void)
-{
-	platform_driver_unregister(&rtc_device_driver);
-	platform_device_unregister(rtc_platform_device);
-}
-
-module_init(vr41xx_rtc_init);
-module_exit(vr41xx_rtc_exit);