/*
* SuperH On-Chip RTC Support
*
- * Copyright (C) 2006, 2007, 2008 Paul Mundt
+ * Copyright (C) 2006 - 2009 Paul Mundt
* Copyright (C) 2006 Jamie Lenehan
* Copyright (C) 2008 Angelo Castello
*
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>
+#include <linux/log2.h>
+#include <linux/clk.h>
#include <asm/rtc.h>
#define DRV_NAME "sh-rtc"
-#define DRV_VERSION "0.2.0"
+#define DRV_VERSION "0.2.3"
#define RTC_REG(r) ((r) * rtc_reg_size)
#define RCR2_START 0x01 /* Start bit */
struct sh_rtc {
- void __iomem *regbase;
- unsigned long regsize;
- struct resource *res;
- int alarm_irq;
- int periodic_irq;
- int carry_irq;
- struct rtc_device *rtc_dev;
- spinlock_t lock;
- unsigned long capabilities; /* See asm-sh/rtc.h for cap bits */
- unsigned short periodic_freq;
+ void __iomem *regbase;
+ unsigned long regsize;
+ struct resource *res;
+ int alarm_irq;
+ int periodic_irq;
+ int carry_irq;
+ struct clk *clk;
+ struct rtc_device *rtc_dev;
+ spinlock_t lock;
+ unsigned long capabilities; /* See asm/rtc.h for cap bits */
+ unsigned short periodic_freq;
};
-static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
+static int __sh_rtc_interrupt(struct sh_rtc *rtc)
{
- struct sh_rtc *rtc = dev_id;
- unsigned int tmp;
-
- spin_lock(&rtc->lock);
+ unsigned int tmp, pending;
tmp = readb(rtc->regbase + RCR1);
+ pending = tmp & RCR1_CF;
tmp &= ~RCR1_CF;
writeb(tmp, rtc->regbase + RCR1);
/* Users have requested One x Second IRQ */
- if (rtc->periodic_freq & PF_OXS)
+ if (pending && rtc->periodic_freq & PF_OXS)
rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
- spin_unlock(&rtc->lock);
-
- return IRQ_HANDLED;
+ return pending;
}
-static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
+static int __sh_rtc_alarm(struct sh_rtc *rtc)
{
- struct sh_rtc *rtc = dev_id;
- unsigned int tmp;
-
- spin_lock(&rtc->lock);
+ unsigned int tmp, pending;
tmp = readb(rtc->regbase + RCR1);
+ pending = tmp & RCR1_AF;
tmp &= ~(RCR1_AF | RCR1_AIE);
- writeb(tmp, rtc->regbase + RCR1);
-
- rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
+ writeb(tmp, rtc->regbase + RCR1);
- spin_unlock(&rtc->lock);
+ if (pending)
+ rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
- return IRQ_HANDLED;
+ return pending;
}
-static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
+static int __sh_rtc_periodic(struct sh_rtc *rtc)
{
- struct sh_rtc *rtc = dev_id;
struct rtc_device *rtc_dev = rtc->rtc_dev;
- unsigned int tmp;
-
- spin_lock(&rtc->lock);
+ struct rtc_task *irq_task;
+ unsigned int tmp, pending;
tmp = readb(rtc->regbase + RCR2);
+ pending = tmp & RCR2_PEF;
tmp &= ~RCR2_PEF;
writeb(tmp, rtc->regbase + RCR2);
+ if (!pending)
+ return 0;
+
/* Half period enabled than one skipped and the next notified */
if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
rtc->periodic_freq &= ~PF_COUNT;
rtc->periodic_freq |= PF_COUNT;
if (rtc->periodic_freq & PF_KOU) {
spin_lock(&rtc_dev->irq_task_lock);
- if (rtc_dev->irq_task)
- rtc_dev->irq_task->func(rtc_dev->irq_task->private_data);
+ irq_task = rtc_dev->irq_task;
+ if (irq_task)
+ irq_task->func(irq_task->private_data);
spin_unlock(&rtc_dev->irq_task_lock);
} else
rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
}
+ return pending;
+}
+
+static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
+
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_interrupt(rtc);
spin_unlock(&rtc->lock);
- return IRQ_HANDLED;
+ return IRQ_RETVAL(ret);
}
-static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
+static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
+
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_alarm(rtc);
+ spin_unlock(&rtc->lock);
+
+ return IRQ_RETVAL(ret);
+}
+
+static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
+
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_periodic(rtc);
+ spin_unlock(&rtc->lock);
+
+ return IRQ_RETVAL(ret);
+}
+
+static irqreturn_t sh_rtc_shared(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
+
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_interrupt(rtc);
+ ret |= __sh_rtc_alarm(rtc);
+ ret |= __sh_rtc_periodic(rtc);
+ spin_unlock(&rtc->lock);
+
+ return IRQ_RETVAL(ret);
+}
+
+static int sh_rtc_irq_set_state(struct device *dev, int enable)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
unsigned int tmp;
tmp = readb(rtc->regbase + RCR2);
if (enable) {
+ rtc->periodic_freq |= PF_KOU;
tmp &= ~RCR2_PEF; /* Clear PES bit */
tmp |= (rtc->periodic_freq & ~PF_HP); /* Set PES2-0 */
- } else
+ } else {
+ rtc->periodic_freq &= ~PF_KOU;
tmp &= ~(RCR2_PESMASK | RCR2_PEF);
+ }
writeb(tmp, rtc->regbase + RCR2);
spin_unlock_irq(&rtc->lock);
+
+ return 0;
}
-static inline int sh_rtc_setfreq(struct device *dev, unsigned int freq)
+static int sh_rtc_irq_set_freq(struct device *dev, int freq)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
int tmp, ret = 0;
ret = -ENOTSUPP;
}
- if (ret == 0) {
+ if (ret == 0)
rtc->periodic_freq |= tmp;
- rtc->rtc_dev->irq_freq = freq;
- }
spin_unlock_irq(&rtc->lock);
return ret;
tmp = readb(rtc->regbase + RCR1);
- if (!enable)
- tmp &= ~RCR1_AIE;
- else
+ if (enable)
tmp |= RCR1_AIE;
+ else
+ tmp &= ~RCR1_AIE;
writeb(tmp, rtc->regbase + RCR1);
return 0;
}
+static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)
+{
+ struct sh_rtc *rtc = dev_get_drvdata(dev);
+ unsigned int tmp;
+
+ spin_lock_irq(&rtc->lock);
+
+ tmp = readb(rtc->regbase + RCR1);
+
+ if (!enable)
+ tmp &= ~RCR1_CIE;
+ else
+ tmp |= RCR1_CIE;
+
+ writeb(tmp, rtc->regbase + RCR1);
+
+ spin_unlock_irq(&rtc->lock);
+}
+
static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
unsigned int ret = 0;
switch (cmd) {
- case RTC_PIE_OFF:
- case RTC_PIE_ON:
- sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
- break;
case RTC_AIE_OFF:
case RTC_AIE_ON:
sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
break;
case RTC_UIE_OFF:
rtc->periodic_freq &= ~PF_OXS;
+ sh_rtc_setcie(dev, 0);
break;
case RTC_UIE_ON:
rtc->periodic_freq |= PF_OXS;
- break;
- case RTC_IRQP_READ:
- ret = put_user(rtc->rtc_dev->irq_freq,
- (unsigned long __user *)arg);
- break;
- case RTC_IRQP_SET:
- ret = sh_rtc_setfreq(dev, arg);
+ sh_rtc_setcie(dev, 1);
break;
default:
ret = -ENOIOCTLCMD;
tm->tm_sec--;
#endif
+ /* only keep the carry interrupt enabled if UIE is on */
+ if (!(rtc->periodic_freq & PF_OXS))
+ sh_rtc_setcie(dev, 0);
+
dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n",
__func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
- if (rtc_valid_tm(tm) < 0) {
- dev_err(dev, "invalid date\n");
- rtc_time_to_tm(0, tm);
- }
-
- return 0;
+ return rtc_valid_tm(tm);
}
static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
return 0;
}
-static int sh_rtc_irq_set_state(struct device *dev, int enabled)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct sh_rtc *rtc = platform_get_drvdata(pdev);
-
- if (enabled) {
- rtc->periodic_freq |= PF_KOU;
- return sh_rtc_ioctl(dev, RTC_PIE_ON, 0);
- } else {
- rtc->periodic_freq &= ~PF_KOU;
- return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0);
- }
-}
-
-static int sh_rtc_irq_set_freq(struct device *dev, int freq)
-{
- return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
-}
-
static struct rtc_class_ops sh_rtc_ops = {
.ioctl = sh_rtc_ioctl,
.read_time = sh_rtc_read_time,
.proc = sh_rtc_proc,
};
-static int __devinit sh_rtc_probe(struct platform_device *pdev)
+static int __init sh_rtc_probe(struct platform_device *pdev)
{
struct sh_rtc *rtc;
struct resource *res;
- unsigned int tmp;
- int ret;
+ struct rtc_time r;
+ char clk_name[6];
+ int clk_id, ret;
rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
if (unlikely(!rtc))
ret = platform_get_irq(pdev, 0);
if (unlikely(ret <= 0)) {
ret = -ENOENT;
- dev_err(&pdev->dev, "No IRQ for period\n");
+ dev_err(&pdev->dev, "No IRQ resource\n");
goto err_badres;
}
- rtc->periodic_irq = ret;
- ret = platform_get_irq(pdev, 1);
- if (unlikely(ret <= 0)) {
- ret = -ENOENT;
- dev_err(&pdev->dev, "No IRQ for carry\n");
- goto err_badres;
- }
- rtc->carry_irq = ret;
-
- ret = platform_get_irq(pdev, 2);
- if (unlikely(ret <= 0)) {
- ret = -ENOENT;
- dev_err(&pdev->dev, "No IRQ for alarm\n");
- goto err_badres;
- }
- rtc->alarm_irq = ret;
+ rtc->periodic_irq = ret;
+ rtc->carry_irq = platform_get_irq(pdev, 1);
+ rtc->alarm_irq = platform_get_irq(pdev, 2);
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (unlikely(res == NULL)) {
goto err_badres;
}
- rtc->regsize = res->end - res->start + 1;
+ rtc->regsize = resource_size(res);
rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
if (unlikely(!rtc->res)) {
goto err_badmap;
}
- rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
- &sh_rtc_ops, THIS_MODULE);
- if (IS_ERR(rtc->rtc_dev)) {
- ret = PTR_ERR(rtc->rtc_dev);
- goto err_unmap;
+ clk_id = pdev->id;
+ /* With a single device, the clock id is still "rtc0" */
+ if (clk_id < 0)
+ clk_id = 0;
+
+ snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);
+
+ rtc->clk = clk_get(&pdev->dev, clk_name);
+ if (IS_ERR(rtc->clk)) {
+ /*
+ * No error handling for rtc->clk intentionally, not all
+ * platforms will have a unique clock for the RTC, and
+ * the clk API can handle the struct clk pointer being
+ * NULL.
+ */
+ rtc->clk = NULL;
}
+ clk_enable(rtc->clk);
+
rtc->capabilities = RTC_DEF_CAPABILITIES;
if (pdev->dev.platform_data) {
struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
rtc->capabilities |= pinfo->capabilities;
}
- rtc->rtc_dev->max_user_freq = 256;
- rtc->rtc_dev->irq_freq = 1;
- rtc->periodic_freq = 0x60;
+ if (rtc->carry_irq <= 0) {
+ /* register shared periodic/carry/alarm irq */
+ ret = request_irq(rtc->periodic_irq, sh_rtc_shared,
+ IRQF_DISABLED, "sh-rtc", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request IRQ failed with %d, IRQ %d\n", ret,
+ rtc->periodic_irq);
+ goto err_unmap;
+ }
+ } else {
+ /* register periodic/carry/alarm irqs */
+ ret = request_irq(rtc->periodic_irq, sh_rtc_periodic,
+ IRQF_DISABLED, "sh-rtc period", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request period IRQ failed with %d, IRQ %d\n",
+ ret, rtc->periodic_irq);
+ goto err_unmap;
+ }
- platform_set_drvdata(pdev, rtc);
+ ret = request_irq(rtc->carry_irq, sh_rtc_interrupt,
+ IRQF_DISABLED, "sh-rtc carry", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request carry IRQ failed with %d, IRQ %d\n",
+ ret, rtc->carry_irq);
+ free_irq(rtc->periodic_irq, rtc);
+ goto err_unmap;
+ }
- /* register periodic/carry/alarm irqs */
- ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
- "sh-rtc period", rtc);
- if (unlikely(ret)) {
- dev_err(&pdev->dev,
- "request period IRQ failed with %d, IRQ %d\n", ret,
- rtc->periodic_irq);
- goto err_unmap;
+ ret = request_irq(rtc->alarm_irq, sh_rtc_alarm,
+ IRQF_DISABLED, "sh-rtc alarm", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request alarm IRQ failed with %d, IRQ %d\n",
+ ret, rtc->alarm_irq);
+ free_irq(rtc->carry_irq, rtc);
+ free_irq(rtc->periodic_irq, rtc);
+ goto err_unmap;
+ }
}
- ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
- "sh-rtc carry", rtc);
- if (unlikely(ret)) {
- dev_err(&pdev->dev,
- "request carry IRQ failed with %d, IRQ %d\n", ret,
- rtc->carry_irq);
- free_irq(rtc->periodic_irq, rtc);
- goto err_unmap;
- }
+ platform_set_drvdata(pdev, rtc);
- ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
- "sh-rtc alarm", rtc);
- if (unlikely(ret)) {
- dev_err(&pdev->dev,
- "request alarm IRQ failed with %d, IRQ %d\n", ret,
- rtc->alarm_irq);
- free_irq(rtc->carry_irq, rtc);
+ /* everything disabled by default */
+ sh_rtc_irq_set_freq(&pdev->dev, 0);
+ sh_rtc_irq_set_state(&pdev->dev, 0);
+ sh_rtc_setaie(&pdev->dev, 0);
+ sh_rtc_setcie(&pdev->dev, 0);
+
+ rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
+ &sh_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc->rtc_dev)) {
+ ret = PTR_ERR(rtc->rtc_dev);
free_irq(rtc->periodic_irq, rtc);
+ free_irq(rtc->carry_irq, rtc);
+ free_irq(rtc->alarm_irq, rtc);
goto err_unmap;
}
- tmp = readb(rtc->regbase + RCR1);
- tmp &= ~RCR1_CF;
- tmp |= RCR1_CIE;
- writeb(tmp, rtc->regbase + RCR1);
+ rtc->rtc_dev->max_user_freq = 256;
+ /* reset rtc to epoch 0 if time is invalid */
+ if (rtc_read_time(rtc->rtc_dev, &r) < 0) {
+ rtc_time_to_tm(0, &r);
+ rtc_set_time(rtc->rtc_dev, &r);
+ }
+
+ device_init_wakeup(&pdev->dev, 1);
return 0;
err_unmap:
+ clk_disable(rtc->clk);
+ clk_put(rtc->clk);
iounmap(rtc->regbase);
err_badmap:
release_resource(rtc->res);
return ret;
}
-static int __devexit sh_rtc_remove(struct platform_device *pdev)
+static int __exit sh_rtc_remove(struct platform_device *pdev)
{
struct sh_rtc *rtc = platform_get_drvdata(pdev);
- if (likely(rtc->rtc_dev))
- rtc_device_unregister(rtc->rtc_dev);
+ rtc_device_unregister(rtc->rtc_dev);
+ sh_rtc_irq_set_state(&pdev->dev, 0);
- sh_rtc_setpie(&pdev->dev, 0);
sh_rtc_setaie(&pdev->dev, 0);
+ sh_rtc_setcie(&pdev->dev, 0);
- free_irq(rtc->carry_irq, rtc);
free_irq(rtc->periodic_irq, rtc);
- free_irq(rtc->alarm_irq, rtc);
- release_resource(rtc->res);
+ if (rtc->carry_irq > 0) {
+ free_irq(rtc->carry_irq, rtc);
+ free_irq(rtc->alarm_irq, rtc);
+ }
iounmap(rtc->regbase);
+ release_resource(rtc->res);
+
+ clk_disable(rtc->clk);
+ clk_put(rtc->clk);
platform_set_drvdata(pdev, NULL);
return 0;
}
+
+static void sh_rtc_set_irq_wake(struct device *dev, int enabled)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct sh_rtc *rtc = platform_get_drvdata(pdev);
+
+ set_irq_wake(rtc->periodic_irq, enabled);
+
+ if (rtc->carry_irq > 0) {
+ set_irq_wake(rtc->carry_irq, enabled);
+ set_irq_wake(rtc->alarm_irq, enabled);
+ }
+}
+
+static int sh_rtc_suspend(struct device *dev)
+{
+ if (device_may_wakeup(dev))
+ sh_rtc_set_irq_wake(dev, 1);
+
+ return 0;
+}
+
+static int sh_rtc_resume(struct device *dev)
+{
+ if (device_may_wakeup(dev))
+ sh_rtc_set_irq_wake(dev, 0);
+
+ return 0;
+}
+
+static const struct dev_pm_ops sh_rtc_dev_pm_ops = {
+ .suspend = sh_rtc_suspend,
+ .resume = sh_rtc_resume,
+};
+
static struct platform_driver sh_rtc_platform_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
+ .pm = &sh_rtc_dev_pm_ops,
},
- .probe = sh_rtc_probe,
- .remove = __devexit_p(sh_rtc_remove),
+ .remove = __exit_p(sh_rtc_remove),
};
static int __init sh_rtc_init(void)
{
- return platform_driver_register(&sh_rtc_platform_driver);
+ return platform_driver_probe(&sh_rtc_platform_driver, sh_rtc_probe);
}
static void __exit sh_rtc_exit(void)
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff