android_kernel_xiaomi_sm8350/drivers/rtc/rtc-sh.c
David Brownell 743e6a504f rtc: file close() consistently disables repeating irqs
Make the rtc framework consistent about disabling 1/second update IRQs
that may have been activated through the /dev interface, when that /dev
file is closed.  (It may have closed because of coredump, etc.) This was
previously done only for emulated update IRQs ...  now, do it always.

Also comment the current policy: repeating IRQs (periodic, update) that
userspace enabled will be cleanly disabled, but alarms are left alone.
Such repeating IRQs are a constant and pointless system load.

Update some RTC drivers to remove now-needless release() methods.  Most
such methods just enforce that policy.  The others all seem to be buggy,
and mistreat in-kernel clients of periodic or alarm IRQs.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Andrew Sharp <andy.sharp@onstor.com>
Cc: Angelo Castello <angelo.castello@st.com>
Acked-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Cc: Thomas Hommel <thomas.hommel@gefanuc.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-16 11:21:40 -07:00

743 lines
18 KiB
C

/*
* SuperH On-Chip RTC Support
*
* Copyright (C) 2006, 2007, 2008 Paul Mundt
* Copyright (C) 2006 Jamie Lenehan
* Copyright (C) 2008 Angelo Castello
*
* Based on the old arch/sh/kernel/cpu/rtc.c by:
*
* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <asm/rtc.h>
#define DRV_NAME "sh-rtc"
#define DRV_VERSION "0.2.0"
#define RTC_REG(r) ((r) * rtc_reg_size)
#define R64CNT RTC_REG(0)
#define RSECCNT RTC_REG(1) /* RTC sec */
#define RMINCNT RTC_REG(2) /* RTC min */
#define RHRCNT RTC_REG(3) /* RTC hour */
#define RWKCNT RTC_REG(4) /* RTC week */
#define RDAYCNT RTC_REG(5) /* RTC day */
#define RMONCNT RTC_REG(6) /* RTC month */
#define RYRCNT RTC_REG(7) /* RTC year */
#define RSECAR RTC_REG(8) /* ALARM sec */
#define RMINAR RTC_REG(9) /* ALARM min */
#define RHRAR RTC_REG(10) /* ALARM hour */
#define RWKAR RTC_REG(11) /* ALARM week */
#define RDAYAR RTC_REG(12) /* ALARM day */
#define RMONAR RTC_REG(13) /* ALARM month */
#define RCR1 RTC_REG(14) /* Control */
#define RCR2 RTC_REG(15) /* Control */
/*
* Note on RYRAR and RCR3: Up until this point most of the register
* definitions are consistent across all of the available parts. However,
* the placement of the optional RYRAR and RCR3 (the RYRAR control
* register used to control RYRCNT/RYRAR compare) varies considerably
* across various parts, occasionally being mapped in to a completely
* unrelated address space. For proper RYRAR support a separate resource
* would have to be handed off, but as this is purely optional in
* practice, we simply opt not to support it, thereby keeping the code
* quite a bit more simplified.
*/
/* ALARM Bits - or with BCD encoded value */
#define AR_ENB 0x80 /* Enable for alarm cmp */
/* Period Bits */
#define PF_HP 0x100 /* Enable Half Period to support 8,32,128Hz */
#define PF_COUNT 0x200 /* Half periodic counter */
#define PF_OXS 0x400 /* Periodic One x Second */
#define PF_KOU 0x800 /* Kernel or User periodic request 1=kernel */
#define PF_MASK 0xf00
/* RCR1 Bits */
#define RCR1_CF 0x80 /* Carry Flag */
#define RCR1_CIE 0x10 /* Carry Interrupt Enable */
#define RCR1_AIE 0x08 /* Alarm Interrupt Enable */
#define RCR1_AF 0x01 /* Alarm Flag */
/* RCR2 Bits */
#define RCR2_PEF 0x80 /* PEriodic interrupt Flag */
#define RCR2_PESMASK 0x70 /* Periodic interrupt Set */
#define RCR2_RTCEN 0x08 /* ENable RTC */
#define RCR2_ADJ 0x04 /* ADJustment (30-second) */
#define RCR2_RESET 0x02 /* Reset bit */
#define RCR2_START 0x01 /* Start bit */
struct sh_rtc {
void __iomem *regbase;
unsigned long regsize;
struct resource *res;
unsigned int alarm_irq, periodic_irq, 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;
};
static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
{
struct sh_rtc *rtc = dev_id;
unsigned int tmp;
spin_lock(&rtc->lock);
tmp = readb(rtc->regbase + RCR1);
tmp &= ~RCR1_CF;
writeb(tmp, rtc->regbase + RCR1);
/* Users have requested One x Second IRQ */
if (rtc->periodic_freq & PF_OXS)
rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
spin_unlock(&rtc->lock);
return IRQ_HANDLED;
}
static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
{
struct sh_rtc *rtc = dev_id;
unsigned int tmp;
spin_lock(&rtc->lock);
tmp = readb(rtc->regbase + RCR1);
tmp &= ~(RCR1_AF | RCR1_AIE);
writeb(tmp, rtc->regbase + RCR1);
rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
spin_unlock(&rtc->lock);
return IRQ_HANDLED;
}
static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
{
struct sh_rtc *rtc = dev_id;
struct rtc_device *rtc_dev = rtc->rtc_dev;
unsigned int tmp;
spin_lock(&rtc->lock);
tmp = readb(rtc->regbase + RCR2);
tmp &= ~RCR2_PEF;
writeb(tmp, rtc->regbase + RCR2);
/* 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;
else {
if (rtc->periodic_freq & PF_HP)
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);
spin_unlock(&rtc_dev->irq_task_lock);
} else
rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
}
spin_unlock(&rtc->lock);
return IRQ_HANDLED;
}
static inline void sh_rtc_setpie(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 + RCR2);
if (enable) {
tmp &= ~RCR2_PEF; /* Clear PES bit */
tmp |= (rtc->periodic_freq & ~PF_HP); /* Set PES2-0 */
} else
tmp &= ~(RCR2_PESMASK | RCR2_PEF);
writeb(tmp, rtc->regbase + RCR2);
spin_unlock_irq(&rtc->lock);
}
static inline int sh_rtc_setfreq(struct device *dev, unsigned int freq)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
int tmp, ret = 0;
spin_lock_irq(&rtc->lock);
tmp = rtc->periodic_freq & PF_MASK;
switch (freq) {
case 0:
rtc->periodic_freq = 0x00;
break;
case 1:
rtc->periodic_freq = 0x60;
break;
case 2:
rtc->periodic_freq = 0x50;
break;
case 4:
rtc->periodic_freq = 0x40;
break;
case 8:
rtc->periodic_freq = 0x30 | PF_HP;
break;
case 16:
rtc->periodic_freq = 0x30;
break;
case 32:
rtc->periodic_freq = 0x20 | PF_HP;
break;
case 64:
rtc->periodic_freq = 0x20;
break;
case 128:
rtc->periodic_freq = 0x10 | PF_HP;
break;
case 256:
rtc->periodic_freq = 0x10;
break;
default:
ret = -ENOTSUPP;
}
if (ret == 0) {
rtc->periodic_freq |= tmp;
rtc->rtc_dev->irq_freq = freq;
}
spin_unlock_irq(&rtc->lock);
return ret;
}
static inline void sh_rtc_setaie(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_AIE;
else
tmp |= RCR1_AIE;
writeb(tmp, rtc->regbase + RCR1);
spin_unlock_irq(&rtc->lock);
}
static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
unsigned int tmp;
tmp = readb(rtc->regbase + RCR1);
seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
tmp = readb(rtc->regbase + RCR2);
seq_printf(seq, "periodic_IRQ\t: %s\n",
(tmp & RCR2_PESMASK) ? "yes" : "no");
return 0;
}
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;
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);
break;
default:
ret = -ENOIOCTLCMD;
}
return ret;
}
static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_rtc *rtc = platform_get_drvdata(pdev);
unsigned int sec128, sec2, yr, yr100, cf_bit;
do {
unsigned int tmp;
spin_lock_irq(&rtc->lock);
tmp = readb(rtc->regbase + RCR1);
tmp &= ~RCR1_CF; /* Clear CF-bit */
tmp |= RCR1_CIE;
writeb(tmp, rtc->regbase + RCR1);
sec128 = readb(rtc->regbase + R64CNT);
tm->tm_sec = BCD2BIN(readb(rtc->regbase + RSECCNT));
tm->tm_min = BCD2BIN(readb(rtc->regbase + RMINCNT));
tm->tm_hour = BCD2BIN(readb(rtc->regbase + RHRCNT));
tm->tm_wday = BCD2BIN(readb(rtc->regbase + RWKCNT));
tm->tm_mday = BCD2BIN(readb(rtc->regbase + RDAYCNT));
tm->tm_mon = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
yr = readw(rtc->regbase + RYRCNT);
yr100 = BCD2BIN(yr >> 8);
yr &= 0xff;
} else {
yr = readb(rtc->regbase + RYRCNT);
yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
}
tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
sec2 = readb(rtc->regbase + R64CNT);
cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
spin_unlock_irq(&rtc->lock);
} while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
#if RTC_BIT_INVERTED != 0
if ((sec128 & RTC_BIT_INVERTED))
tm->tm_sec--;
#endif
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;
}
static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_rtc *rtc = platform_get_drvdata(pdev);
unsigned int tmp;
int year;
spin_lock_irq(&rtc->lock);
/* Reset pre-scaler & stop RTC */
tmp = readb(rtc->regbase + RCR2);
tmp |= RCR2_RESET;
tmp &= ~RCR2_START;
writeb(tmp, rtc->regbase + RCR2);
writeb(BIN2BCD(tm->tm_sec), rtc->regbase + RSECCNT);
writeb(BIN2BCD(tm->tm_min), rtc->regbase + RMINCNT);
writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
BIN2BCD(tm->tm_year % 100);
writew(year, rtc->regbase + RYRCNT);
} else {
year = tm->tm_year % 100;
writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
}
/* Start RTC */
tmp = readb(rtc->regbase + RCR2);
tmp &= ~RCR2_RESET;
tmp |= RCR2_RTCEN | RCR2_START;
writeb(tmp, rtc->regbase + RCR2);
spin_unlock_irq(&rtc->lock);
return 0;
}
static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
{
unsigned int byte;
int value = 0xff; /* return 0xff for ignored values */
byte = readb(rtc->regbase + reg_off);
if (byte & AR_ENB) {
byte &= ~AR_ENB; /* strip the enable bit */
value = BCD2BIN(byte);
}
return value;
}
static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_rtc *rtc = platform_get_drvdata(pdev);
struct rtc_time *tm = &wkalrm->time;
spin_lock_irq(&rtc->lock);
tm->tm_sec = sh_rtc_read_alarm_value(rtc, RSECAR);
tm->tm_min = sh_rtc_read_alarm_value(rtc, RMINAR);
tm->tm_hour = sh_rtc_read_alarm_value(rtc, RHRAR);
tm->tm_wday = sh_rtc_read_alarm_value(rtc, RWKAR);
tm->tm_mday = sh_rtc_read_alarm_value(rtc, RDAYAR);
tm->tm_mon = sh_rtc_read_alarm_value(rtc, RMONAR);
if (tm->tm_mon > 0)
tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
tm->tm_year = 0xffff;
wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
spin_unlock_irq(&rtc->lock);
return 0;
}
static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
int value, int reg_off)
{
/* < 0 for a value that is ignored */
if (value < 0)
writeb(0, rtc->regbase + reg_off);
else
writeb(BIN2BCD(value) | AR_ENB, rtc->regbase + reg_off);
}
static int sh_rtc_check_alarm(struct rtc_time *tm)
{
/*
* The original rtc says anything > 0xc0 is "don't care" or "match
* all" - most users use 0xff but rtc-dev uses -1 for the same thing.
* The original rtc doesn't support years - some things use -1 and
* some 0xffff. We use -1 to make out tests easier.
*/
if (tm->tm_year == 0xffff)
tm->tm_year = -1;
if (tm->tm_mon >= 0xff)
tm->tm_mon = -1;
if (tm->tm_mday >= 0xff)
tm->tm_mday = -1;
if (tm->tm_wday >= 0xff)
tm->tm_wday = -1;
if (tm->tm_hour >= 0xff)
tm->tm_hour = -1;
if (tm->tm_min >= 0xff)
tm->tm_min = -1;
if (tm->tm_sec >= 0xff)
tm->tm_sec = -1;
if (tm->tm_year > 9999 ||
tm->tm_mon >= 12 ||
tm->tm_mday == 0 || tm->tm_mday >= 32 ||
tm->tm_wday >= 7 ||
tm->tm_hour >= 24 ||
tm->tm_min >= 60 ||
tm->tm_sec >= 60)
return -EINVAL;
return 0;
}
static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_rtc *rtc = platform_get_drvdata(pdev);
unsigned int rcr1;
struct rtc_time *tm = &wkalrm->time;
int mon, err;
err = sh_rtc_check_alarm(tm);
if (unlikely(err < 0))
return err;
spin_lock_irq(&rtc->lock);
/* disable alarm interrupt and clear the alarm flag */
rcr1 = readb(rtc->regbase + RCR1);
rcr1 &= ~(RCR1_AF | RCR1_AIE);
writeb(rcr1, rtc->regbase + RCR1);
/* set alarm time */
sh_rtc_write_alarm_value(rtc, tm->tm_sec, RSECAR);
sh_rtc_write_alarm_value(rtc, tm->tm_min, RMINAR);
sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
mon = tm->tm_mon;
if (mon >= 0)
mon += 1;
sh_rtc_write_alarm_value(rtc, mon, RMONAR);
if (wkalrm->enabled) {
rcr1 |= RCR1_AIE;
writeb(rcr1, rtc->regbase + RCR1);
}
spin_unlock_irq(&rtc->lock);
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,
.set_time = sh_rtc_set_time,
.read_alarm = sh_rtc_read_alarm,
.set_alarm = sh_rtc_set_alarm,
.irq_set_state = sh_rtc_irq_set_state,
.irq_set_freq = sh_rtc_irq_set_freq,
.proc = sh_rtc_proc,
};
static int __devinit sh_rtc_probe(struct platform_device *pdev)
{
struct sh_rtc *rtc;
struct resource *res;
unsigned int tmp;
int ret = -ENOENT;
rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
if (unlikely(!rtc))
return -ENOMEM;
spin_lock_init(&rtc->lock);
/* get periodic/carry/alarm irqs */
rtc->periodic_irq = platform_get_irq(pdev, 0);
if (unlikely(rtc->periodic_irq < 0)) {
dev_err(&pdev->dev, "No IRQ for period\n");
goto err_badres;
}
rtc->carry_irq = platform_get_irq(pdev, 1);
if (unlikely(rtc->carry_irq < 0)) {
dev_err(&pdev->dev, "No IRQ for carry\n");
goto err_badres;
}
rtc->alarm_irq = platform_get_irq(pdev, 2);
if (unlikely(rtc->alarm_irq < 0)) {
dev_err(&pdev->dev, "No IRQ for alarm\n");
goto err_badres;
}
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (unlikely(res == NULL)) {
dev_err(&pdev->dev, "No IO resource\n");
goto err_badres;
}
rtc->regsize = res->end - res->start + 1;
rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
if (unlikely(!rtc->res)) {
ret = -EBUSY;
goto err_badres;
}
rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
if (unlikely(!rtc->regbase)) {
ret = -EINVAL;
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;
}
rtc->capabilities = RTC_DEF_CAPABILITIES;
if (pdev->dev.platform_data) {
struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
/*
* Some CPUs have special capabilities in addition to the
* default set. Add those in here.
*/
rtc->capabilities |= pinfo->capabilities;
}
rtc->rtc_dev->max_user_freq = 256;
rtc->rtc_dev->irq_freq = 1;
rtc->periodic_freq = 0x60;
platform_set_drvdata(pdev, rtc);
/* 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->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;
}
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;
}
tmp = readb(rtc->regbase + RCR1);
tmp &= ~RCR1_CF;
tmp |= RCR1_CIE;
writeb(tmp, rtc->regbase + RCR1);
return 0;
err_unmap:
iounmap(rtc->regbase);
err_badmap:
release_resource(rtc->res);
err_badres:
kfree(rtc);
return ret;
}
static int __devexit 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);
sh_rtc_setpie(&pdev->dev, 0);
sh_rtc_setaie(&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);
iounmap(rtc->regbase);
platform_set_drvdata(pdev, NULL);
kfree(rtc);
return 0;
}
static struct platform_driver sh_rtc_platform_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
.probe = sh_rtc_probe,
.remove = __devexit_p(sh_rtc_remove),
};
static int __init sh_rtc_init(void)
{
return platform_driver_register(&sh_rtc_platform_driver);
}
static void __exit sh_rtc_exit(void)
{
platform_driver_unregister(&sh_rtc_platform_driver);
}
module_init(sh_rtc_init);
module_exit(sh_rtc_exit);
MODULE_DESCRIPTION("SuperH on-chip RTC driver");
MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
"Jamie Lenehan <lenehan@twibble.org>, "
"Angelo Castello <angelo.castello@st.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);