#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/mod_devicetable.h>
-
-#ifdef CONFIG_HPET_EMULATE_RTC
-#include <asm/hpet.h>
-#endif
+#include <linux/log2.h>
/* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */
#include <asm-generic/rtc.h>
-#ifndef CONFIG_HPET_EMULATE_RTC
-#define is_hpet_enabled() 0
-#define hpet_set_alarm_time(hrs, min, sec) do { } while (0)
-#define hpet_set_periodic_freq(arg) 0
-#define hpet_mask_rtc_irq_bit(arg) do { } while (0)
-#define hpet_set_rtc_irq_bit(arg) do { } while (0)
-#define hpet_rtc_timer_init() do { } while (0)
-#define hpet_register_irq_handler(h) 0
-#define hpet_unregister_irq_handler(h) do { } while (0)
-extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
-#endif
-
struct cmos_rtc {
struct rtc_device *rtc;
struct device *dev;
};
/* both platform and pnp busses use negative numbers for invalid irqs */
-#define is_valid_irq(n) ((n) >= 0)
+#define is_valid_irq(n) ((n) > 0)
static const char driver_name[] = "rtc_cmos";
/*----------------------------------------------------------------*/
+/* Much modern x86 hardware has HPETs (10+ MHz timers) which, because
+ * many BIOS programmers don't set up "sane mode" IRQ routing, are mostly
+ * used in a broken "legacy replacement" mode. The breakage includes
+ * HPET #1 hijacking the IRQ for this RTC, and being unavailable for
+ * other (better) use.
+ *
+ * When that broken mode is in use, platform glue provides a partial
+ * emulation of hardware RTC IRQ facilities using HPET #1. We don't
+ * want to use HPET for anything except those IRQs though...
+ */
+#ifdef CONFIG_HPET_EMULATE_RTC
+#include <asm/hpet.h>
+#else
+
+static inline int is_hpet_enabled(void)
+{
+ return 0;
+}
+
+static inline int hpet_mask_rtc_irq_bit(unsigned long mask)
+{
+ return 0;
+}
+
+static inline int hpet_set_rtc_irq_bit(unsigned long mask)
+{
+ return 0;
+}
+
+static inline int
+hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec)
+{
+ return 0;
+}
+
+static inline int hpet_set_periodic_freq(unsigned long freq)
+{
+ return 0;
+}
+
+static inline int hpet_rtc_dropped_irq(void)
+{
+ return 0;
+}
+
+static inline int hpet_rtc_timer_init(void)
+{
+ return 0;
+}
+
+extern irq_handler_t hpet_rtc_interrupt;
+
+static inline int hpet_register_irq_handler(irq_handler_t handler)
+{
+ return 0;
+}
+
+static inline int hpet_unregister_irq_handler(irq_handler_t handler)
+{
+ return 0;
+}
+
+#endif
+
+/*----------------------------------------------------------------*/
+
+#ifdef RTC_PORT
+
+/* Most newer x86 systems have two register banks, the first used
+ * for RTC and NVRAM and the second only for NVRAM. Caller must
+ * own rtc_lock ... and we won't worry about access during NMI.
+ */
+#define can_bank2 true
+
+static inline unsigned char cmos_read_bank2(unsigned char addr)
+{
+ outb(addr, RTC_PORT(2));
+ return inb(RTC_PORT(3));
+}
+
+static inline void cmos_write_bank2(unsigned char val, unsigned char addr)
+{
+ outb(addr, RTC_PORT(2));
+ outb(val, RTC_PORT(2));
+}
+
+#else
+
+#define can_bank2 false
+
+static inline unsigned char cmos_read_bank2(unsigned char addr)
+{
+ return 0;
+}
+
+static inline void cmos_write_bank2(unsigned char val, unsigned char addr)
+{
+}
+
+#endif
+
+/*----------------------------------------------------------------*/
+
static int cmos_read_time(struct device *dev, struct rtc_time *t)
{
/* REVISIT: if the clock has a "century" register, use
rtc_control = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock);
- /* REVISIT this assumes PC style usage: always BCD */
-
- if (((unsigned)t->time.tm_sec) < 0x60)
- t->time.tm_sec = BCD2BIN(t->time.tm_sec);
- else
- t->time.tm_sec = -1;
- if (((unsigned)t->time.tm_min) < 0x60)
- t->time.tm_min = BCD2BIN(t->time.tm_min);
- else
- t->time.tm_min = -1;
- if (((unsigned)t->time.tm_hour) < 0x24)
- t->time.tm_hour = BCD2BIN(t->time.tm_hour);
- else
- t->time.tm_hour = -1;
-
- if (cmos->day_alrm) {
- if (((unsigned)t->time.tm_mday) <= 0x31)
- t->time.tm_mday = BCD2BIN(t->time.tm_mday);
+ if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+ if (((unsigned)t->time.tm_sec) < 0x60)
+ t->time.tm_sec = bcd2bin(t->time.tm_sec);
else
- t->time.tm_mday = -1;
- if (cmos->mon_alrm) {
- if (((unsigned)t->time.tm_mon) <= 0x12)
- t->time.tm_mon = BCD2BIN(t->time.tm_mon) - 1;
+ t->time.tm_sec = -1;
+ if (((unsigned)t->time.tm_min) < 0x60)
+ t->time.tm_min = bcd2bin(t->time.tm_min);
+ else
+ t->time.tm_min = -1;
+ if (((unsigned)t->time.tm_hour) < 0x24)
+ t->time.tm_hour = bcd2bin(t->time.tm_hour);
+ else
+ t->time.tm_hour = -1;
+
+ if (cmos->day_alrm) {
+ if (((unsigned)t->time.tm_mday) <= 0x31)
+ t->time.tm_mday = bcd2bin(t->time.tm_mday);
else
- t->time.tm_mon = -1;
+ t->time.tm_mday = -1;
+
+ if (cmos->mon_alrm) {
+ if (((unsigned)t->time.tm_mon) <= 0x12)
+ t->time.tm_mon = bcd2bin(t->time.tm_mon)-1;
+ else
+ t->time.tm_mon = -1;
+ }
}
}
t->time.tm_year = -1;
return 0;
}
+static void cmos_checkintr(struct cmos_rtc *cmos, unsigned char rtc_control)
+{
+ unsigned char rtc_intr;
+
+ /* NOTE after changing RTC_xIE bits we always read INTR_FLAGS;
+ * allegedly some older rtcs need that to handle irqs properly
+ */
+ rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
+
+ if (is_hpet_enabled())
+ return;
+
+ rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
+ if (is_intr(rtc_intr))
+ rtc_update_irq(cmos->rtc, 1, rtc_intr);
+}
+
+static void cmos_irq_enable(struct cmos_rtc *cmos, unsigned char mask)
+{
+ unsigned char rtc_control;
+
+ /* flush any pending IRQ status, notably for update irqs,
+ * before we enable new IRQs
+ */
+ rtc_control = CMOS_READ(RTC_CONTROL);
+ cmos_checkintr(cmos, rtc_control);
+
+ rtc_control |= mask;
+ CMOS_WRITE(rtc_control, RTC_CONTROL);
+ hpet_set_rtc_irq_bit(mask);
+
+ cmos_checkintr(cmos, rtc_control);
+}
+
+static void cmos_irq_disable(struct cmos_rtc *cmos, unsigned char mask)
+{
+ unsigned char rtc_control;
+
+ rtc_control = CMOS_READ(RTC_CONTROL);
+ rtc_control &= ~mask;
+ CMOS_WRITE(rtc_control, RTC_CONTROL);
+ hpet_mask_rtc_irq_bit(mask);
+
+ cmos_checkintr(cmos, rtc_control);
+}
+
static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
- unsigned char mon, mday, hrs, min, sec;
- unsigned char rtc_control, rtc_intr;
+ unsigned char mon, mday, hrs, min, sec, rtc_control;
if (!is_valid_irq(cmos->irq))
return -EIO;
- /* REVISIT this assumes PC style usage: always BCD */
-
- /* Writing 0xff means "don't care" or "match all". */
-
mon = t->time.tm_mon + 1;
- mon = (mon <= 12) ? BIN2BCD(mon) : 0xff;
-
mday = t->time.tm_mday;
- mday = (mday >= 1 && mday <= 31) ? BIN2BCD(mday) : 0xff;
-
hrs = t->time.tm_hour;
- hrs = (hrs < 24) ? BIN2BCD(hrs) : 0xff;
-
min = t->time.tm_min;
- min = (min < 60) ? BIN2BCD(min) : 0xff;
-
sec = t->time.tm_sec;
- sec = (sec < 60) ? BIN2BCD(sec) : 0xff;
- hpet_set_alarm_time(t->time.tm_hour, t->time.tm_min, t->time.tm_sec);
+ rtc_control = CMOS_READ(RTC_CONTROL);
+ if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+ /* Writing 0xff means "don't care" or "match all". */
+ mon = (mon <= 12) ? bin2bcd(mon) : 0xff;
+ mday = (mday >= 1 && mday <= 31) ? bin2bcd(mday) : 0xff;
+ hrs = (hrs < 24) ? bin2bcd(hrs) : 0xff;
+ min = (min < 60) ? bin2bcd(min) : 0xff;
+ sec = (sec < 60) ? bin2bcd(sec) : 0xff;
+ }
+
spin_lock_irq(&rtc_lock);
/* next rtc irq must not be from previous alarm setting */
- rtc_control = CMOS_READ(RTC_CONTROL);
- rtc_control &= ~RTC_AIE;
- CMOS_WRITE(rtc_control, RTC_CONTROL);
- rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
- rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
- if (is_intr(rtc_intr))
- rtc_update_irq(cmos->rtc, 1, rtc_intr);
+ cmos_irq_disable(cmos, RTC_AIE);
/* update alarm */
CMOS_WRITE(hrs, RTC_HOURS_ALARM);
CMOS_WRITE(mon, cmos->mon_alrm);
}
- if (t->enabled) {
- rtc_control |= RTC_AIE;
- CMOS_WRITE(rtc_control, RTC_CONTROL);
- rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
- rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
- if (is_intr(rtc_intr))
- rtc_update_irq(cmos->rtc, 1, rtc_intr);
- }
+ /* FIXME the HPET alarm glue currently ignores day_alrm
+ * and mon_alrm ...
+ */
+ hpet_set_alarm_time(t->time.tm_hour, t->time.tm_min, t->time.tm_sec);
+
+ if (t->enabled)
+ cmos_irq_enable(cmos, RTC_AIE);
spin_unlock_irq(&rtc_lock);
if (!is_valid_irq(cmos->irq))
return -ENXIO;
+ if (!is_power_of_2(freq))
+ return -EINVAL;
/* 0 = no irqs; 1 = 2^15 Hz ... 15 = 2^0 Hz */
f = ffs(freq);
if (f-- > 16)
f = 16 - f;
spin_lock_irqsave(&rtc_lock, flags);
- if (!hpet_set_periodic_freq(freq))
- CMOS_WRITE(RTC_REF_CLCK_32KHZ | f, RTC_FREQ_SELECT);
+ hpet_set_periodic_freq(freq);
+ CMOS_WRITE(RTC_REF_CLCK_32KHZ | f, RTC_FREQ_SELECT);
spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
static int cmos_irq_set_state(struct device *dev, int enabled)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
- unsigned char rtc_control, rtc_intr;
unsigned long flags;
if (!is_valid_irq(cmos->irq))
return -ENXIO;
spin_lock_irqsave(&rtc_lock, flags);
- rtc_control = CMOS_READ(RTC_CONTROL);
if (enabled)
- rtc_control |= RTC_PIE;
+ cmos_irq_enable(cmos, RTC_PIE);
else
- rtc_control &= ~RTC_PIE;
+ cmos_irq_disable(cmos, RTC_PIE);
- CMOS_WRITE(rtc_control, RTC_CONTROL);
+ spin_unlock_irqrestore(&rtc_lock, flags);
+ return 0;
+}
- rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
- rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
- if (is_intr(rtc_intr))
- rtc_update_irq(cmos->rtc, 1, rtc_intr);
+static int cmos_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct cmos_rtc *cmos = dev_get_drvdata(dev);
+ unsigned long flags;
+
+ if (!is_valid_irq(cmos->irq))
+ return -EINVAL;
+
+ spin_lock_irqsave(&rtc_lock, flags);
+
+ if (enabled)
+ cmos_irq_enable(cmos, RTC_AIE);
+ else
+ cmos_irq_disable(cmos, RTC_AIE);
spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}
-#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE)
-
-static int
-cmos_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+static int cmos_update_irq_enable(struct device *dev, unsigned int enabled)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
- unsigned char rtc_control, rtc_intr;
unsigned long flags;
- switch (cmd) {
- case RTC_AIE_OFF:
- case RTC_AIE_ON:
- case RTC_UIE_OFF:
- case RTC_UIE_ON:
- case RTC_PIE_OFF:
- case RTC_PIE_ON:
- if (!is_valid_irq(cmos->irq))
- return -EINVAL;
- break;
- default:
- return -ENOIOCTLCMD;
- }
+ if (!is_valid_irq(cmos->irq))
+ return -EINVAL;
spin_lock_irqsave(&rtc_lock, flags);
- rtc_control = CMOS_READ(RTC_CONTROL);
- switch (cmd) {
- case RTC_AIE_OFF: /* alarm off */
- rtc_control &= ~RTC_AIE;
- hpet_mask_rtc_irq_bit(RTC_AIE);
- break;
- case RTC_AIE_ON: /* alarm on */
- rtc_control |= RTC_AIE;
- hpet_set_rtc_irq_bit(RTC_AIE);
- break;
- case RTC_UIE_OFF: /* update off */
- rtc_control &= ~RTC_UIE;
- hpet_mask_rtc_irq_bit(RTC_UIE);
- break;
- case RTC_UIE_ON: /* update on */
- rtc_control |= RTC_UIE;
- hpet_set_rtc_irq_bit(RTC_UIE);
- break;
- case RTC_PIE_OFF: /* periodic off */
- rtc_control &= ~RTC_PIE;
- hpet_mask_rtc_irq_bit(RTC_PIE);
- break;
- case RTC_PIE_ON: /* periodic on */
- rtc_control |= RTC_PIE;
- hpet_set_rtc_irq_bit(RTC_PIE);
- break;
- }
- if (!is_hpet_enabled())
- CMOS_WRITE(rtc_control, RTC_CONTROL);
- rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
- rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
- if (is_intr(rtc_intr))
- rtc_update_irq(cmos->rtc, 1, rtc_intr);
+ if (enabled)
+ cmos_irq_enable(cmos, RTC_UIE);
+ else
+ cmos_irq_disable(cmos, RTC_UIE);
spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}
-#else
-#define cmos_rtc_ioctl NULL
-#endif
-
#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
static int cmos_procfs(struct device *dev, struct seq_file *seq)
"update_IRQ\t: %s\n"
"HPET_emulated\t: %s\n"
// "square_wave\t: %s\n"
- // "BCD\t\t: %s\n"
+ "BCD\t\t: %s\n"
"DST_enable\t: %s\n"
"periodic_freq\t: %d\n"
"batt_status\t: %s\n",
(rtc_control & RTC_UIE) ? "yes" : "no",
is_hpet_enabled() ? "yes" : "no",
// (rtc_control & RTC_SQWE) ? "yes" : "no",
- // (rtc_control & RTC_DM_BINARY) ? "no" : "yes",
+ (rtc_control & RTC_DM_BINARY) ? "no" : "yes",
(rtc_control & RTC_DST_EN) ? "yes" : "no",
cmos->rtc->irq_freq,
(valid & RTC_VRT) ? "okay" : "dead");
#endif
static const struct rtc_class_ops cmos_rtc_ops = {
- .ioctl = cmos_rtc_ioctl,
- .read_time = cmos_read_time,
- .set_time = cmos_set_time,
- .read_alarm = cmos_read_alarm,
- .set_alarm = cmos_set_alarm,
- .proc = cmos_procfs,
- .irq_set_freq = cmos_irq_set_freq,
- .irq_set_state = cmos_irq_set_state,
+ .read_time = cmos_read_time,
+ .set_time = cmos_set_time,
+ .read_alarm = cmos_read_alarm,
+ .set_alarm = cmos_set_alarm,
+ .proc = cmos_procfs,
+ .irq_set_freq = cmos_irq_set_freq,
+ .irq_set_state = cmos_irq_set_state,
+ .alarm_irq_enable = cmos_alarm_irq_enable,
+ .update_irq_enable = cmos_update_irq_enable,
};
/*----------------------------------------------------------------*/
#define NVRAM_OFFSET (RTC_REG_D + 1)
static ssize_t
-cmos_nvram_read(struct kobject *kobj, struct bin_attribute *attr,
+cmos_nvram_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
{
int retval;
if (unlikely(off >= attr->size))
return 0;
+ if (unlikely(off < 0))
+ return -EINVAL;
if ((off + count) > attr->size)
count = attr->size - off;
+ off += NVRAM_OFFSET;
spin_lock_irq(&rtc_lock);
- for (retval = 0, off += NVRAM_OFFSET; count--; retval++, off++)
- *buf++ = CMOS_READ(off);
+ for (retval = 0; count; count--, off++, retval++) {
+ if (off < 128)
+ *buf++ = CMOS_READ(off);
+ else if (can_bank2)
+ *buf++ = cmos_read_bank2(off);
+ else
+ break;
+ }
spin_unlock_irq(&rtc_lock);
return retval;
}
static ssize_t
-cmos_nvram_write(struct kobject *kobj, struct bin_attribute *attr,
+cmos_nvram_write(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
{
struct cmos_rtc *cmos;
cmos = dev_get_drvdata(container_of(kobj, struct device, kobj));
if (unlikely(off >= attr->size))
return -EFBIG;
+ if (unlikely(off < 0))
+ return -EINVAL;
if ((off + count) > attr->size)
count = attr->size - off;
* here. If userspace is smart enough to know what fields of
* NVRAM to update, updating checksums is also part of its job.
*/
+ off += NVRAM_OFFSET;
spin_lock_irq(&rtc_lock);
- for (retval = 0, off += NVRAM_OFFSET; count--; retval++, off++) {
+ for (retval = 0; count; count--, off++, retval++) {
/* don't trash RTC registers */
if (off == cmos->day_alrm
|| off == cmos->mon_alrm
|| off == cmos->century)
buf++;
- else
+ else if (off < 128)
CMOS_WRITE(*buf++, off);
+ else if (can_bank2)
+ cmos_write_bank2(*buf++, off);
+ else
+ break;
}
spin_unlock_irq(&rtc_lock);
.attr = {
.name = "nvram",
.mode = S_IRUGO | S_IWUSR,
- .owner = THIS_MODULE,
},
.read = cmos_nvram_read,
u8 rtc_control;
spin_lock(&rtc_lock);
- /*
- * In this case it is HPET RTC interrupt handler
- * calling us, with the interrupt information
- * passed as arg1, instead of irq.
+
+ /* When the HPET interrupt handler calls us, the interrupt
+ * status is passed as arg1 instead of the irq number. But
+ * always clear irq status, even when HPET is in the way.
+ *
+ * Note that HPET and RTC are almost certainly out of phase,
+ * giving different IRQ status ...
*/
+ irqstat = CMOS_READ(RTC_INTR_FLAGS);
+ rtc_control = CMOS_READ(RTC_CONTROL);
if (is_hpet_enabled())
irqstat = (unsigned long)irq & 0xF0;
- else {
- irqstat = CMOS_READ(RTC_INTR_FLAGS);
- rtc_control = CMOS_READ(RTC_CONTROL);
- irqstat &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
- }
+ irqstat &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
/* All Linux RTC alarms should be treated as if they were oneshot.
* Similar code may be needed in system wakeup paths, in case the
* alarm woke the system.
*/
if (irqstat & RTC_AIE) {
- rtc_control = CMOS_READ(RTC_CONTROL);
rtc_control &= ~RTC_AIE;
CMOS_WRITE(rtc_control, RTC_CONTROL);
+ hpet_mask_rtc_irq_bit(RTC_AIE);
+
CMOS_READ(RTC_INTR_FLAGS);
}
spin_unlock(&rtc_lock);
/* Heuristic to deduce NVRAM size ... do what the legacy NVRAM
* driver did, but don't reject unknown configs. Old hardware
- * won't address 128 bytes, and for now we ignore the way newer
- * chips can address 256 bytes (using two more i/o ports).
+ * won't address 128 bytes. Newer chips have multiple banks,
+ * though they may not be listed in one I/O resource.
*/
#if defined(CONFIG_ATARI)
address_space = 64;
-#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__)
+#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) \
+ || defined(__sparc__) || defined(__mips__)
address_space = 128;
#else
#warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes.
address_space = 128;
#endif
+ if (can_bank2 && ports->end > (ports->start + 1))
+ address_space = 256;
/* For ACPI systems extension info comes from the FADT. On others,
* board specific setup provides it as appropriate. Systems where
}
}
+ cmos_rtc.dev = dev;
+ dev_set_drvdata(dev, &cmos_rtc);
+
cmos_rtc.rtc = rtc_device_register(driver_name, dev,
&cmos_rtc_ops, THIS_MODULE);
if (IS_ERR(cmos_rtc.rtc)) {
goto cleanup0;
}
- cmos_rtc.dev = dev;
- dev_set_drvdata(dev, &cmos_rtc);
- rename_region(ports, cmos_rtc.rtc->dev.bus_id);
+ rename_region(ports, dev_name(&cmos_rtc.rtc->dev));
spin_lock_irq(&rtc_lock);
* do something about other clock frequencies.
*/
cmos_rtc.rtc->irq_freq = 1024;
- if (!hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq))
- CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT);
+ hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq);
+ CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT);
+
+ /* disable irqs */
+ cmos_irq_disable(&cmos_rtc, RTC_PIE | RTC_AIE | RTC_UIE);
- /* disable irqs.
- *
- * NOTE after changing RTC_xIE bits we always read INTR_FLAGS;
- * allegedly some older rtcs need that to handle irqs properly
- */
rtc_control = CMOS_READ(RTC_CONTROL);
- rtc_control &= ~(RTC_PIE | RTC_AIE | RTC_UIE);
- CMOS_WRITE(rtc_control, RTC_CONTROL);
- CMOS_READ(RTC_INTR_FLAGS);
spin_unlock_irq(&rtc_lock);
- /* FIXME teach the alarm code how to handle binary mode;
+ /* FIXME:
* <asm-generic/rtc.h> doesn't know 12-hour mode either.
*/
- if (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY))) {
- dev_dbg(dev, "only 24-hr BCD mode supported\n");
+ if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) {
+ dev_warn(dev, "only 24-hr supported\n");
retval = -ENXIO;
goto cleanup1;
}
rtc_cmos_int_handler = cmos_interrupt;
retval = request_irq(rtc_irq, rtc_cmos_int_handler,
- IRQF_DISABLED, cmos_rtc.rtc->dev.bus_id,
+ IRQF_DISABLED, dev_name(&cmos_rtc.rtc->dev),
cmos_rtc.rtc);
if (retval < 0) {
dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq);
goto cleanup2;
}
- pr_info("%s: alarms up to one %s%s\n",
- cmos_rtc.rtc->dev.bus_id,
- is_valid_irq(rtc_irq)
- ? (cmos_rtc.mon_alrm
- ? "year"
- : (cmos_rtc.day_alrm
- ? "month" : "day"))
- : "no",
- cmos_rtc.century ? ", y3k" : ""
- );
+ pr_info("%s: %s%s, %zd bytes nvram%s\n",
+ dev_name(&cmos_rtc.rtc->dev),
+ !is_valid_irq(rtc_irq) ? "no alarms" :
+ cmos_rtc.mon_alrm ? "alarms up to one year" :
+ cmos_rtc.day_alrm ? "alarms up to one month" :
+ "alarms up to one day",
+ cmos_rtc.century ? ", y3k" : "",
+ nvram.size,
+ is_hpet_enabled() ? ", hpet irqs" : "");
return 0;
static void cmos_do_shutdown(void)
{
- unsigned char rtc_control;
-
spin_lock_irq(&rtc_lock);
- rtc_control = CMOS_READ(RTC_CONTROL);
- rtc_control &= ~(RTC_PIE|RTC_AIE|RTC_UIE);
- CMOS_WRITE(rtc_control, RTC_CONTROL);
- CMOS_READ(RTC_INTR_FLAGS);
+ cmos_irq_disable(&cmos_rtc, RTC_IRQMASK);
spin_unlock_irq(&rtc_lock);
}
static int cmos_suspend(struct device *dev, pm_message_t mesg)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
- int do_wake = device_may_wakeup(dev);
unsigned char tmp;
/* only the alarm might be a wakeup event source */
spin_lock_irq(&rtc_lock);
cmos->suspend_ctrl = tmp = CMOS_READ(RTC_CONTROL);
if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) {
- unsigned char irqstat;
+ unsigned char mask;
- if (do_wake)
- tmp &= ~(RTC_PIE|RTC_UIE);
+ if (device_may_wakeup(dev))
+ mask = RTC_IRQMASK & ~RTC_AIE;
else
- tmp &= ~(RTC_PIE|RTC_AIE|RTC_UIE);
+ mask = RTC_IRQMASK;
+ tmp &= ~mask;
CMOS_WRITE(tmp, RTC_CONTROL);
- irqstat = CMOS_READ(RTC_INTR_FLAGS);
- irqstat &= (tmp & RTC_IRQMASK) | RTC_IRQF;
- if (is_intr(irqstat))
- rtc_update_irq(cmos->rtc, 1, irqstat);
+
+ /* shut down hpet emulation - we don't need it for alarm */
+ hpet_mask_rtc_irq_bit(RTC_PIE|RTC_AIE|RTC_UIE);
+ cmos_checkintr(cmos, tmp);
}
spin_unlock_irq(&rtc_lock);
}
pr_debug("%s: suspend%s, ctrl %02x\n",
- cmos_rtc.rtc->dev.bus_id,
+ dev_name(&cmos_rtc.rtc->dev),
(tmp & RTC_AIE) ? ", alarm may wake" : "",
tmp);
return 0;
}
+/* We want RTC alarms to wake us from e.g. ACPI G2/S5 "soft off", even
+ * after a detour through G3 "mechanical off", although the ACPI spec
+ * says wakeup should only work from G1/S4 "hibernate". To most users,
+ * distinctions between S4 and S5 are pointless. So when the hardware
+ * allows, don't draw that distinction.
+ */
+static inline int cmos_poweroff(struct device *dev)
+{
+ return cmos_suspend(dev, PMSG_HIBERNATE);
+}
+
static int cmos_resume(struct device *dev)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
unsigned char tmp = cmos->suspend_ctrl;
/* re-enable any irqs previously active */
- if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) {
+ if (tmp & RTC_IRQMASK) {
+ unsigned char mask;
if (cmos->enabled_wake) {
if (cmos->wake_off)
}
spin_lock_irq(&rtc_lock);
- CMOS_WRITE(tmp, RTC_CONTROL);
- tmp = CMOS_READ(RTC_INTR_FLAGS);
- tmp &= (cmos->suspend_ctrl & RTC_IRQMASK) | RTC_IRQF;
- if (is_intr(tmp))
- rtc_update_irq(cmos->rtc, 1, tmp);
+ do {
+ CMOS_WRITE(tmp, RTC_CONTROL);
+ hpet_set_rtc_irq_bit(tmp & RTC_IRQMASK);
+
+ mask = CMOS_READ(RTC_INTR_FLAGS);
+ mask &= (tmp & RTC_IRQMASK) | RTC_IRQF;
+ if (!is_hpet_enabled() || !is_intr(mask))
+ break;
+
+ /* force one-shot behavior if HPET blocked
+ * the wake alarm's irq
+ */
+ rtc_update_irq(cmos->rtc, 1, mask);
+ tmp &= ~RTC_AIE;
+ hpet_mask_rtc_irq_bit(RTC_AIE);
+ } while (mask & RTC_AIE);
spin_unlock_irq(&rtc_lock);
}
pr_debug("%s: resume, ctrl %02x\n",
- cmos_rtc.rtc->dev.bus_id,
- cmos->suspend_ctrl);
-
+ dev_name(&cmos_rtc.rtc->dev),
+ tmp);
return 0;
}
#else
#define cmos_suspend NULL
#define cmos_resume NULL
+
+static inline int cmos_poweroff(struct device *dev)
+{
+ return -ENOSYS;
+}
+
#endif
/*----------------------------------------------------------------*/
* predate even PNPBIOS should set up platform_bus devices.
*/
+#ifdef CONFIG_ACPI
+
+#include <linux/acpi.h>
+
+#ifdef CONFIG_PM
+static u32 rtc_handler(void *context)
+{
+ acpi_clear_event(ACPI_EVENT_RTC);
+ acpi_disable_event(ACPI_EVENT_RTC, 0);
+ return ACPI_INTERRUPT_HANDLED;
+}
+
+static inline void rtc_wake_setup(void)
+{
+ acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
+ /*
+ * After the RTC handler is installed, the Fixed_RTC event should
+ * be disabled. Only when the RTC alarm is set will it be enabled.
+ */
+ acpi_clear_event(ACPI_EVENT_RTC);
+ acpi_disable_event(ACPI_EVENT_RTC, 0);
+}
+
+static void rtc_wake_on(struct device *dev)
+{
+ acpi_clear_event(ACPI_EVENT_RTC);
+ acpi_enable_event(ACPI_EVENT_RTC, 0);
+}
+
+static void rtc_wake_off(struct device *dev)
+{
+ acpi_disable_event(ACPI_EVENT_RTC, 0);
+}
+#else
+#define rtc_wake_setup() do{}while(0)
+#define rtc_wake_on NULL
+#define rtc_wake_off NULL
+#endif
+
+/* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find
+ * its device node and pass extra config data. This helps its driver use
+ * capabilities that the now-obsolete mc146818 didn't have, and informs it
+ * that this board's RTC is wakeup-capable (per ACPI spec).
+ */
+static struct cmos_rtc_board_info acpi_rtc_info;
+
+static void __devinit
+cmos_wake_setup(struct device *dev)
+{
+ if (acpi_disabled)
+ return;
+
+ rtc_wake_setup();
+ acpi_rtc_info.wake_on = rtc_wake_on;
+ acpi_rtc_info.wake_off = rtc_wake_off;
+
+ /* workaround bug in some ACPI tables */
+ if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) {
+ dev_dbg(dev, "bogus FADT month_alarm (%d)\n",
+ acpi_gbl_FADT.month_alarm);
+ acpi_gbl_FADT.month_alarm = 0;
+ }
+
+ acpi_rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
+ acpi_rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
+ acpi_rtc_info.rtc_century = acpi_gbl_FADT.century;
+
+ /* NOTE: S4_RTC_WAKE is NOT currently useful to Linux */
+ if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
+ dev_info(dev, "RTC can wake from S4\n");
+
+ dev->platform_data = &acpi_rtc_info;
+
+ /* RTC always wakes from S1/S2/S3, and often S4/STD */
+ device_init_wakeup(dev, 1);
+}
+
+#else
+
+static void __devinit
+cmos_wake_setup(struct device *dev)
+{
+}
+
+#endif
+
#ifdef CONFIG_PNP
#include <linux/pnp.h>
static int __devinit
cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
{
- /* REVISIT paranoia argues for a shutdown notifier, since PNP
- * drivers can't provide shutdown() methods to disable IRQs.
- * Or better yet, fix PNP to allow those methods...
- */
+ cmos_wake_setup(&pnp->dev);
+
if (pnp_port_start(pnp,0) == 0x70 && !pnp_irq_valid(pnp,0))
/* Some machines contain a PNP entry for the RTC, but
* don't define the IRQ. It should always be safe to
* hardcode it in these cases
*/
- return cmos_do_probe(&pnp->dev, &pnp->res.port_resource[0], 8);
+ return cmos_do_probe(&pnp->dev,
+ pnp_get_resource(pnp, IORESOURCE_IO, 0), 8);
else
return cmos_do_probe(&pnp->dev,
- &pnp->res.port_resource[0],
- pnp->res.irq_resource[0].start);
+ pnp_get_resource(pnp, IORESOURCE_IO, 0),
+ pnp_irq(pnp, 0));
}
static void __exit cmos_pnp_remove(struct pnp_dev *pnp)
#define cmos_pnp_resume NULL
#endif
+static void cmos_pnp_shutdown(struct pnp_dev *pnp)
+{
+ if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(&pnp->dev))
+ return;
+
+ cmos_do_shutdown();
+}
static const struct pnp_device_id rtc_ids[] = {
{ .id = "PNP0b00", },
.id_table = rtc_ids,
.probe = cmos_pnp_probe,
.remove = __exit_p(cmos_pnp_remove),
+ .shutdown = cmos_pnp_shutdown,
/* flag ensures resume() gets called, and stops syslog spam */
.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
.resume = cmos_pnp_resume,
};
-static int __init cmos_init(void)
-{
- return pnp_register_driver(&cmos_pnp_driver);
-}
-module_init(cmos_init);
-
-static void __exit cmos_exit(void)
-{
- pnp_unregister_driver(&cmos_pnp_driver);
-}
-module_exit(cmos_exit);
-
-#else /* no PNP */
+#endif /* CONFIG_PNP */
/*----------------------------------------------------------------*/
static int __init cmos_platform_probe(struct platform_device *pdev)
{
+ cmos_wake_setup(&pdev->dev);
return cmos_do_probe(&pdev->dev,
platform_get_resource(pdev, IORESOURCE_IO, 0),
platform_get_irq(pdev, 0));
static void cmos_platform_shutdown(struct platform_device *pdev)
{
+ if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(&pdev->dev))
+ return;
+
cmos_do_shutdown();
}
}
};
+#ifdef CONFIG_PNP
+static bool pnp_driver_registered;
+#endif
+static bool platform_driver_registered;
+
static int __init cmos_init(void)
{
- return platform_driver_probe(&cmos_platform_driver,
- cmos_platform_probe);
+ int retval = 0;
+
+#ifdef CONFIG_PNP
+ retval = pnp_register_driver(&cmos_pnp_driver);
+ if (retval == 0)
+ pnp_driver_registered = true;
+#endif
+
+ if (!cmos_rtc.dev) {
+ retval = platform_driver_probe(&cmos_platform_driver,
+ cmos_platform_probe);
+ if (retval == 0)
+ platform_driver_registered = true;
+ }
+
+ if (retval == 0)
+ return 0;
+
+#ifdef CONFIG_PNP
+ if (pnp_driver_registered)
+ pnp_unregister_driver(&cmos_pnp_driver);
+#endif
+ return retval;
}
module_init(cmos_init);
static void __exit cmos_exit(void)
{
- platform_driver_unregister(&cmos_platform_driver);
+#ifdef CONFIG_PNP
+ if (pnp_driver_registered)
+ pnp_unregister_driver(&cmos_pnp_driver);
+#endif
+ if (platform_driver_registered)
+ platform_driver_unregister(&cmos_platform_driver);
}
module_exit(cmos_exit);
-#endif /* !PNP */
-
MODULE_AUTHOR("David Brownell");
MODULE_DESCRIPTION("Driver for PC-style 'CMOS' RTCs");
MODULE_LICENSE("GPL");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff