/*
* Driver for NEC VR4100 series Real Time Clock unit.
*
- * Copyright (C) 2003-2006 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
+ * Copyright (C) 2003-2008 Yoichi Yuasa <yuasa@linux-mips.org>
*
* 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
* 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/err.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/ioport.h>
-#include <linux/irq.h>
+#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/spinlock.h>
#include <linux/types.h>
+#include <linux/log2.h>
#include <asm/div64.h>
#include <asm/io.h>
#include <asm/uaccess.h>
-#include <asm/vr41xx/vr41xx.h>
-MODULE_AUTHOR("Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>");
+MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
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
+MODULE_LICENSE("GPL v2");
/* RTC 1 registers */
#define ETIMELREG 0x00
#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;
static unsigned long epoch = 1970; /* Jan 1 1970 00:00:00 */
-static spinlock_t rtc_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(rtc_lock);
static char rtc_name[] = "RTC";
-static unsigned long periodic_frequency;
static unsigned long periodic_count;
-
-struct resource rtc_resource[2] = {
- { .name = rtc_name,
- .flags = IORESOURCE_MEM, },
- { .name = rtc_name,
- .flags = IORESOURCE_MEM, },
-};
+static unsigned int alarm_enabled;
+static int aie_irq;
+static int pie_irq;
static inline unsigned long read_elapsed_second(void)
{
spin_unlock_irq(&rtc_lock);
- disable_irq(ELAPSEDTIME_IRQ);
- disable_irq(RTCLONG1_IRQ);
+ disable_irq(aie_irq);
+ disable_irq(pie_irq);
}
static int vr41xx_rtc_read_time(struct device *dev, struct rtc_time *time)
low = rtc1_read(ECMPLREG);
mid = rtc1_read(ECMPMREG);
high = rtc1_read(ECMPHREG);
+ wkalrm->enabled = alarm_enabled;
spin_unlock_irq(&rtc_lock);
spin_lock_irq(&rtc_lock);
+ if (alarm_enabled)
+ disable_irq(aie_irq);
+
rtc1_write(ECMPLREG, (uint16_t)(alarm_sec << 15));
rtc1_write(ECMPMREG, (uint16_t)(alarm_sec >> 1));
rtc1_write(ECMPHREG, (uint16_t)(alarm_sec >> 17));
+ if (wkalrm->enabled)
+ enable_irq(aie_irq);
+
+ alarm_enabled = wkalrm->enabled;
+
spin_unlock_irq(&rtc_lock);
return 0;
}
-static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+static int vr41xx_rtc_irq_set_freq(struct device *dev, int freq)
{
- unsigned long count;
+ u64 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_IRQP_READ:
- return put_user(periodic_frequency, (unsigned long __user *)arg);
- break;
- case RTC_IRQP_SET:
- if (arg > MAX_PERIODIC_RATE)
- return -EINVAL;
+ if (!is_power_of_2(freq))
+ return -EINVAL;
+ count = RTC_FREQUENCY;
+ do_div(count, freq);
+
+ spin_lock_irq(&rtc_lock);
+
+ periodic_count = count;
+ rtc1_write(RTCL1LREG, periodic_count);
+ rtc1_write(RTCL1HREG, periodic_count >> 16);
+
+ spin_unlock_irq(&rtc_lock);
+
+ return 0;
+}
- if (arg > MAX_USER_PERIODIC_RATE && capable(CAP_SYS_RESOURCE) == 0)
- return -EACCES;
+static int vr41xx_rtc_irq_set_state(struct device *dev, int enabled)
+{
+ if (enabled)
+ enable_irq(pie_irq);
+ else
+ disable_irq(pie_irq);
- periodic_frequency = arg;
+ return 0;
+}
- count = RTC_FREQUENCY;
- do_div(count, arg);
+static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case RTC_AIE_ON:
+ spin_lock_irq(&rtc_lock);
- periodic_count = count;
+ if (!alarm_enabled) {
+ enable_irq(aie_irq);
+ alarm_enabled = 1;
+ }
+ spin_unlock_irq(&rtc_lock);
+ break;
+ case RTC_AIE_OFF:
spin_lock_irq(&rtc_lock);
- rtc1_write(RTCL1LREG, count);
- rtc1_write(RTCL1HREG, count >> 16);
+ if (alarm_enabled) {
+ disable_irq(aie_irq);
+ alarm_enabled = 0;
+ }
spin_unlock_irq(&rtc_lock);
break;
/* 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 -ENOIOCTLCMD;
}
return 0;
}
-static irqreturn_t elapsedtime_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t elapsedtime_interrupt(int irq, void *dev_id)
{
struct platform_device *pdev = (struct platform_device *)dev_id;
struct rtc_device *rtc = platform_get_drvdata(pdev);
rtc2_write(RTCINTREG, ELAPSEDTIME_INT);
- rtc_update_irq(&rtc->class_dev, 1, RTC_AF);
+ rtc_update_irq(rtc, 1, RTC_AF);
return IRQ_HANDLED;
}
-static irqreturn_t rtclong1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t rtclong1_interrupt(int irq, void *dev_id)
{
struct platform_device *pdev = (struct platform_device *)dev_id;
struct rtc_device *rtc = platform_get_drvdata(pdev);
rtc1_write(RTCL1LREG, count);
rtc1_write(RTCL1HREG, count >> 16);
- rtc_update_irq(&rtc->class_dev, 1, RTC_PF);
+ rtc_update_irq(rtc, 1, RTC_PF);
return IRQ_HANDLED;
}
-static struct rtc_class_ops vr41xx_rtc_ops = {
+static const struct rtc_class_ops vr41xx_rtc_ops = {
.release = vr41xx_rtc_release,
.ioctl = vr41xx_rtc_ioctl,
.read_time = vr41xx_rtc_read_time,
.set_time = vr41xx_rtc_set_time,
.read_alarm = vr41xx_rtc_read_alarm,
.set_alarm = vr41xx_rtc_set_alarm,
+ .irq_set_freq = vr41xx_rtc_irq_set_freq,
+ .irq_set_state = vr41xx_rtc_irq_set_state,
};
static int __devinit rtc_probe(struct platform_device *pdev)
{
+ struct resource *res;
struct rtc_device *rtc;
- unsigned int irq;
int retval;
- if (pdev->num_resources != 2)
+ if (pdev->num_resources != 4)
return -EBUSY;
- rtc1_base = ioremap(pdev->resource[0].start, RTC1_SIZE);
- if (rtc1_base == NULL)
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
return -EBUSY;
- rtc2_base = ioremap(pdev->resource[1].start, RTC2_SIZE);
- if (rtc2_base == NULL) {
- iounmap(rtc1_base);
- rtc1_base = NULL;
+ rtc1_base = ioremap(res->start, res->end - res->start + 1);
+ if (!rtc1_base)
return -EBUSY;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res) {
+ retval = -EBUSY;
+ goto err_rtc1_iounmap;
+ }
+
+ rtc2_base = ioremap(res->start, res->end - res->start + 1);
+ if (!rtc2_base) {
+ retval = -EBUSY;
+ goto err_rtc1_iounmap;
}
rtc = rtc_device_register(rtc_name, &pdev->dev, &vr41xx_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc)) {
- iounmap(rtc1_base);
- iounmap(rtc2_base);
- rtc1_base = NULL;
- rtc2_base = NULL;
- return PTR_ERR(rtc);
+ retval = PTR_ERR(rtc);
+ goto err_iounmap_all;
}
+ rtc->max_user_freq = MAX_PERIODIC_RATE;
+
spin_lock_irq(&rtc_lock);
rtc1_write(ECMPLREG, 0);
spin_unlock_irq(&rtc_lock);
- irq = ELAPSEDTIME_IRQ;
- retval = request_irq(irq, elapsedtime_interrupt, SA_INTERRUPT,
- "elapsed_time", pdev);
- if (retval == 0) {
- irq = RTCLONG1_IRQ;
- retval = request_irq(irq, rtclong1_interrupt, SA_INTERRUPT,
- "rtclong1", pdev);
+ aie_irq = platform_get_irq(pdev, 0);
+ if (aie_irq <= 0) {
+ retval = -EBUSY;
+ goto err_device_unregister;
}
- if (retval < 0) {
- printk(KERN_ERR "rtc: IRQ%d is busy\n", irq);
- rtc_device_unregister(rtc);
- if (irq == RTCLONG1_IRQ)
- free_irq(ELAPSEDTIME_IRQ, NULL);
- iounmap(rtc1_base);
- iounmap(rtc2_base);
- rtc1_base = NULL;
- rtc2_base = NULL;
- return retval;
- }
+ retval = request_irq(aie_irq, elapsedtime_interrupt, IRQF_DISABLED,
+ "elapsed_time", pdev);
+ if (retval < 0)
+ goto err_device_unregister;
+
+ pie_irq = platform_get_irq(pdev, 1);
+ if (pie_irq <= 0)
+ goto err_free_irq;
+
+ retval = request_irq(pie_irq, rtclong1_interrupt, IRQF_DISABLED,
+ "rtclong1", pdev);
+ if (retval < 0)
+ goto err_free_irq;
platform_set_drvdata(pdev, rtc);
- disable_irq(ELAPSEDTIME_IRQ);
- disable_irq(RTCLONG1_IRQ);
+ disable_irq(aie_irq);
+ disable_irq(pie_irq);
printk(KERN_INFO "rtc: Real Time Clock of NEC VR4100 series\n");
return 0;
+
+err_free_irq:
+ free_irq(aie_irq, pdev);
+
+err_device_unregister:
+ rtc_device_unregister(rtc);
+
+err_iounmap_all:
+ iounmap(rtc2_base);
+ rtc2_base = NULL;
+
+err_rtc1_iounmap:
+ iounmap(rtc1_base);
+ rtc1_base = NULL;
+
+ return retval;
}
static int __devexit rtc_remove(struct platform_device *pdev)
struct rtc_device *rtc;
rtc = platform_get_drvdata(pdev);
- if (rtc != NULL)
+ if (rtc)
rtc_device_unregister(rtc);
platform_set_drvdata(pdev, NULL);
- free_irq(ELAPSEDTIME_IRQ, NULL);
- free_irq(RTCLONG1_IRQ, NULL);
- if (rtc1_base != NULL)
+ free_irq(aie_irq, pdev);
+ free_irq(pie_irq, pdev);
+ if (rtc1_base)
iounmap(rtc1_base);
- if (rtc2_base != NULL)
+ if (rtc2_base)
iounmap(rtc2_base);
return 0;
}
-static struct platform_device *rtc_platform_device;
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:RTC");
static struct platform_driver rtc_platform_driver = {
.probe = rtc_probe,
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 == NULL)
- 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_platform_driver);
- if (retval < 0)
- platform_device_unregister(rtc_platform_device);
-
- return retval;
+ return platform_driver_register(&rtc_platform_driver);
}
static void __exit vr41xx_rtc_exit(void)
{
platform_driver_unregister(&rtc_platform_driver);
- platform_device_unregister(rtc_platform_device);
}
module_init(vr41xx_rtc_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff