* 1.09a Pete Zaitcev: Sun SPARC
* 1.09b Jeff Garzik: Modularize, init cleanup
* 1.09c Jeff Garzik: SMP cleanup
- * 1.10 Paul Barton-Davis: add support for async I/O
+ * 1.10 Paul Barton-Davis: add support for async I/O
* 1.10a Andrea Arcangeli: Alpha updates
* 1.10b Andrew Morton: SMP lock fix
* 1.10c Cesar Barros: SMP locking fixes and cleanup
* 1.10d Paul Gortmaker: delete paranoia check in rtc_exit
* 1.10e Maciej W. Rozycki: Handle DECstation's year weirdness.
- * 1.11 Takashi Iwai: Kernel access functions
+ * 1.11 Takashi Iwai: Kernel access functions
* rtc_register/rtc_unregister/rtc_control
* 1.11a Daniele Bellucci: Audit create_proc_read_entry in rtc_init
* 1.12 Venkatesh Pallipadi: Hooks for emulating rtc on HPET base-timer
* CONFIG_HPET_EMULATE_RTC
- *
+ * 1.12a Maciej W. Rozycki: Handle memory-mapped chips properly.
+ * 1.12ac Alan Cox: Allow read access to the day of week register
*/
-#define RTC_VERSION "1.12"
-
-#define RTC_IO_EXTENT 0x8
+#define RTC_VERSION "1.12ac"
/*
* Note that *all* calls to CMOS_READ and CMOS_WRITE are done with
* this driver.)
*/
-#include <linux/config.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sysctl.h>
#include <linux/wait.h>
#include <linux/bcd.h>
+#include <linux/delay.h>
#include <asm/current.h>
#include <asm/uaccess.h>
#include <asm/system.h>
-#if defined(__i386__)
+#ifdef CONFIG_X86
#include <asm/hpet.h>
#endif
-#ifdef __sparc__
+#ifdef CONFIG_SPARC32
#include <linux/pci.h>
#include <asm/ebus.h>
-#ifdef __sparc_v9__
-#include <asm/isa.h>
-#endif
static unsigned long rtc_port;
static int rtc_irq = PCI_IRQ_NONE;
#define hpet_set_rtc_irq_bit(arg) 0
#define hpet_rtc_timer_init() do { } while (0)
#define hpet_rtc_dropped_irq() 0
-static inline irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs) {return 0;}
+#ifdef RTC_IRQ
+static irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id)
+{
+ return 0;
+}
+#endif
#else
-extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
#endif
/*
static DECLARE_WAIT_QUEUE_HEAD(rtc_wait);
#ifdef RTC_IRQ
-static struct timer_list rtc_irq_timer;
+static void rtc_dropped_irq(unsigned long data);
+
+static DEFINE_TIMER(rtc_irq_timer, rtc_dropped_irq, 0, 0);
#endif
static ssize_t rtc_read(struct file *file, char __user *buf,
static void get_rtc_alm_time (struct rtc_time *alm_tm);
#ifdef RTC_IRQ
-static void rtc_dropped_irq(unsigned long data);
+static void set_rtc_irq_bit_locked(unsigned char bit);
+static void mask_rtc_irq_bit_locked(unsigned char bit);
-static void set_rtc_irq_bit(unsigned char bit);
-static void mask_rtc_irq_bit(unsigned char bit);
+static inline void set_rtc_irq_bit(unsigned char bit)
+{
+ spin_lock_irq(&rtc_lock);
+ set_rtc_irq_bit_locked(bit);
+ spin_unlock_irq(&rtc_lock);
+}
+
+static void mask_rtc_irq_bit(unsigned char bit)
+{
+ spin_lock_irq(&rtc_lock);
+ mask_rtc_irq_bit_locked(bit);
+ spin_unlock_irq(&rtc_lock);
+}
#endif
+#ifdef CONFIG_PROC_FS
static int rtc_proc_open(struct inode *inode, struct file *file);
+#endif
/*
* Bits in rtc_status. (6 bits of room for future expansion)
*/
static inline unsigned char rtc_is_updating(void)
{
+ unsigned long flags;
unsigned char uip;
- spin_lock_irq(&rtc_lock);
+ spin_lock_irqsave(&rtc_lock, flags);
uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP);
- spin_unlock_irq(&rtc_lock);
+ spin_unlock_irqrestore(&rtc_lock, flags);
return uip;
}
#ifdef RTC_IRQ
/*
- * A very tiny interrupt handler. It runs with SA_INTERRUPT set,
+ * A very tiny interrupt handler. It runs with IRQF_DISABLED set,
* but there is possibility of conflicting with the set_rtc_mmss()
* call (the rtc irq and the timer irq can easily run at the same
* time in two different CPUs). So we need to serialize
* (See ./arch/XXXX/kernel/time.c for the set_rtc_mmss() function.)
*/
-irqreturn_t rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+irqreturn_t rtc_interrupt(int irq, void *dev_id)
{
/*
* Can be an alarm interrupt, update complete interrupt,
*/
static ctl_table rtc_table[] = {
{
- .ctl_name = 1,
+ .ctl_name = CTL_UNNUMBERED,
.procname = "max-user-freq",
.data = &rtc_max_user_freq,
.maxlen = sizeof(int),
static ctl_table rtc_root[] = {
{
- .ctl_name = 1,
+ .ctl_name = CTL_UNNUMBERED,
.procname = "rtc",
- .maxlen = 0,
.mode = 0555,
.child = rtc_table,
},
{
.ctl_name = CTL_DEV,
.procname = "dev",
- .maxlen = 0,
.mode = 0555,
.child = rtc_root,
},
static int __init init_sysctl(void)
{
- sysctl_header = register_sysctl_table(dev_root, 0);
+ sysctl_header = register_sysctl_table(dev_root);
return 0;
}
if (rtc_has_irq == 0)
return -EIO;
- if (count < sizeof(unsigned))
+ /*
+ * Historically this function used to assume that sizeof(unsigned long)
+ * is the same in userspace and kernelspace. This lead to problems
+ * for configurations with multiple ABIs such a the MIPS o32 and 64
+ * ABIs supported on the same kernel. So now we support read of both
+ * 4 and 8 bytes and assume that's the sizeof(unsigned long) in the
+ * userspace ABI.
+ */
+ if (count != sizeof(unsigned int) && count != sizeof(unsigned long))
return -EINVAL;
add_wait_queue(&rtc_wait, &wait);
schedule();
} while (1);
- if (count < sizeof(unsigned long))
- retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int);
+ if (count == sizeof(unsigned int))
+ retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int);
else
retval = put_user(data, (unsigned long __user *)buf) ?: sizeof(long);
+ if (!retval)
+ retval = count;
out:
- current->state = TASK_RUNNING;
+ __set_current_state(TASK_RUNNING);
remove_wait_queue(&rtc_wait, &wait);
return retval;
}
case RTC_PIE_OFF: /* Mask periodic int. enab. bit */
{
- mask_rtc_irq_bit(RTC_PIE);
+ unsigned long flags; /* can be called from isr via rtc_control() */
+ spin_lock_irqsave (&rtc_lock, flags);
+ mask_rtc_irq_bit_locked(RTC_PIE);
if (rtc_status & RTC_TIMER_ON) {
- spin_lock_irq (&rtc_lock);
rtc_status &= ~RTC_TIMER_ON;
del_timer(&rtc_irq_timer);
- spin_unlock_irq (&rtc_lock);
}
+ spin_unlock_irqrestore (&rtc_lock, flags);
return 0;
}
case RTC_PIE_ON: /* Allow periodic ints */
{
-
+ unsigned long flags; /* can be called from isr via rtc_control() */
/*
* We don't really want Joe User enabling more
* than 64Hz of interrupts on a multi-user machine.
(!capable(CAP_SYS_RESOURCE)))
return -EACCES;
+ spin_lock_irqsave (&rtc_lock, flags);
if (!(rtc_status & RTC_TIMER_ON)) {
- spin_lock_irq (&rtc_lock);
- rtc_irq_timer.expires = jiffies + HZ/rtc_freq + 2*HZ/100;
- add_timer(&rtc_irq_timer);
+ mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq +
+ 2*HZ/100);
rtc_status |= RTC_TIMER_ON;
- spin_unlock_irq (&rtc_lock);
}
- set_rtc_irq_bit(RTC_PIE);
+ set_rtc_irq_bit_locked(RTC_PIE);
+ spin_unlock_irqrestore (&rtc_lock, flags);
return 0;
}
case RTC_UIE_OFF: /* Mask ints from RTC updates. */
{
int tmp = 0;
unsigned char val;
+ unsigned long flags; /* can be called from isr via rtc_control() */
/*
* The max we can do is 8192Hz.
if (arg != (1<<tmp))
return -EINVAL;
- spin_lock_irq(&rtc_lock);
+ spin_lock_irqsave(&rtc_lock, flags);
if (hpet_set_periodic_freq(arg)) {
- spin_unlock_irq(&rtc_lock);
+ spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}
rtc_freq = arg;
val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0;
val |= (16 - tmp);
CMOS_WRITE(val, RTC_FREQ_SELECT);
- spin_unlock_irq(&rtc_lock);
+ spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}
#endif
#ifndef RTC_IRQ
return -EIO;
#else
- spin_lock_irq(&rtc_task_lock);
+ unsigned long flags;
+ if (cmd != RTC_PIE_ON && cmd != RTC_PIE_OFF && cmd != RTC_IRQP_SET)
+ return -EINVAL;
+ spin_lock_irqsave(&rtc_task_lock, flags);
if (rtc_callback != task) {
- spin_unlock_irq(&rtc_task_lock);
+ spin_unlock_irqrestore(&rtc_task_lock, flags);
return -ENXIO;
}
- spin_unlock_irq(&rtc_task_lock);
+ spin_unlock_irqrestore(&rtc_task_lock, flags);
return rtc_do_ioctl(cmd, arg, 1);
#endif
}
* The various file operations we support.
*/
-static struct file_operations rtc_fops = {
+static const struct file_operations rtc_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = rtc_read,
.fops = &rtc_fops,
};
-static struct file_operations rtc_proc_fops = {
+#ifdef CONFIG_PROC_FS
+static const struct file_operations rtc_proc_fops = {
.owner = THIS_MODULE,
.open = rtc_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
-
-#if defined(RTC_IRQ) && !defined(__sparc__)
-static irqreturn_t (*rtc_int_handler_ptr)(int irq, void *dev_id, struct pt_regs *regs);
#endif
+static resource_size_t rtc_size;
+
+static struct resource * __init rtc_request_region(resource_size_t size)
+{
+ struct resource *r;
+
+ if (RTC_IOMAPPED)
+ r = request_region(RTC_PORT(0), size, "rtc");
+ else
+ r = request_mem_region(RTC_PORT(0), size, "rtc");
+
+ if (r)
+ rtc_size = size;
+
+ return r;
+}
+
+static void rtc_release_region(void)
+{
+ if (RTC_IOMAPPED)
+ release_region(RTC_PORT(0), rtc_size);
+ else
+ release_mem_region(RTC_PORT(0), rtc_size);
+}
+
static int __init rtc_init(void)
{
+#ifdef CONFIG_PROC_FS
struct proc_dir_entry *ent;
+#endif
#if defined(__alpha__) || defined(__mips__)
unsigned int year, ctrl;
- unsigned long uip_watchdog;
char *guess = NULL;
#endif
-#ifdef __sparc__
+#ifdef CONFIG_SPARC32
struct linux_ebus *ebus;
struct linux_ebus_device *edev;
-#ifdef __sparc_v9__
- struct sparc_isa_bridge *isa_br;
- struct sparc_isa_device *isa_dev;
+#else
+ void *r;
+#ifdef RTC_IRQ
+ irq_handler_t rtc_int_handler_ptr;
#endif
#endif
-#ifdef __sparc__
+#ifdef CONFIG_SPARC32
for_each_ebus(ebus) {
for_each_ebusdev(edev, ebus) {
- if(strcmp(edev->prom_name, "rtc") == 0) {
+ if(strcmp(edev->prom_node->name, "rtc") == 0) {
rtc_port = edev->resource[0].start;
rtc_irq = edev->irqs[0];
goto found;
}
}
}
-#ifdef __sparc_v9__
- for_each_isa(isa_br) {
- for_each_isadev(isa_dev, isa_br) {
- if (strcmp(isa_dev->prom_name, "rtc") == 0) {
- rtc_port = isa_dev->resource.start;
- rtc_irq = isa_dev->irq;
- goto found;
- }
- }
- }
-#endif
+ rtc_has_irq = 0;
printk(KERN_ERR "rtc_init: no PC rtc found\n");
return -EIO;
/*
* XXX Interrupt pin #7 in Espresso is shared between RTC and
- * PCI Slot 2 INTA# (and some INTx# in Slot 1). SA_INTERRUPT here
- * is asking for trouble with add-on boards. Change to SA_SHIRQ.
+ * PCI Slot 2 INTA# (and some INTx# in Slot 1).
*/
- if (request_irq(rtc_irq, rtc_interrupt, SA_INTERRUPT, "rtc", (void *)&rtc_port)) {
- /*
- * Standard way for sparc to print irq's is to use
- * __irq_itoa(). I think for EBus it's ok to use %d.
- */
+ if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc", (void *)&rtc_port)) {
+ rtc_has_irq = 0;
printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq);
return -EIO;
}
no_irq:
#else
- if (!request_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc")) {
- printk(KERN_ERR "rtc: I/O port %d is not free.\n", RTC_PORT (0));
+ r = rtc_request_region(RTC_IO_EXTENT);
+
+ /*
+ * If we've already requested a smaller range (for example, because
+ * PNPBIOS or ACPI told us how the device is configured), the request
+ * above might fail because it's too big.
+ *
+ * If so, request just the range we actually use.
+ */
+ if (!r)
+ r = rtc_request_region(RTC_IO_EXTENT_USED);
+ if (!r) {
+#ifdef RTC_IRQ
+ rtc_has_irq = 0;
+#endif
+ printk(KERN_ERR "rtc: I/O resource %lx is not free.\n",
+ (long)(RTC_PORT(0)));
return -EIO;
}
rtc_int_handler_ptr = rtc_interrupt;
}
- if(request_irq(RTC_IRQ, rtc_int_handler_ptr, SA_INTERRUPT, "rtc", NULL)) {
+ if(request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED, "rtc", NULL)) {
/* Yeah right, seeing as irq 8 doesn't even hit the bus. */
+ rtc_has_irq = 0;
printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ);
- release_region(RTC_PORT(0), RTC_IO_EXTENT);
+ rtc_release_region();
return -EIO;
}
hpet_rtc_timer_init();
#endif
-#endif /* __sparc__ vs. others */
+#endif /* CONFIG_SPARC32 vs. others */
if (misc_register(&rtc_dev)) {
#ifdef RTC_IRQ
free_irq(RTC_IRQ, NULL);
+ rtc_has_irq = 0;
#endif
- release_region(RTC_PORT(0), RTC_IO_EXTENT);
+ rtc_release_region();
return -ENODEV;
}
+#ifdef CONFIG_PROC_FS
ent = create_proc_entry("driver/rtc", 0, NULL);
- if (!ent) {
-#ifdef RTC_IRQ
- free_irq(RTC_IRQ, NULL);
+ if (ent)
+ ent->proc_fops = &rtc_proc_fops;
+ else
+ printk(KERN_WARNING "rtc: Failed to register with procfs.\n");
#endif
- release_region(RTC_PORT(0), RTC_IO_EXTENT);
- misc_deregister(&rtc_dev);
- return -ENOMEM;
- }
- ent->proc_fops = &rtc_proc_fops;
#if defined(__alpha__) || defined(__mips__)
rtc_freq = HZ;
/* Each operating system on an Alpha uses its own epoch.
Let's try to guess which one we are using now. */
- uip_watchdog = jiffies;
if (rtc_is_updating() != 0)
- while (jiffies - uip_watchdog < 2*HZ/100) {
- barrier();
- cpu_relax();
- }
+ msleep(20);
spin_lock_irq(&rtc_lock);
year = CMOS_READ(RTC_YEAR);
if (rtc_has_irq == 0)
goto no_irq2;
- init_timer(&rtc_irq_timer);
- rtc_irq_timer.function = rtc_dropped_irq;
spin_lock_irq(&rtc_lock);
rtc_freq = 1024;
if (!hpet_set_periodic_freq(rtc_freq)) {
remove_proc_entry ("driver/rtc", NULL);
misc_deregister(&rtc_dev);
-#ifdef __sparc__
+#ifdef CONFIG_SPARC32
if (rtc_has_irq)
free_irq (rtc_irq, &rtc_port);
#else
- release_region (RTC_PORT (0), RTC_IO_EXTENT);
+ rtc_release_region();
#ifdef RTC_IRQ
if (rtc_has_irq)
free_irq (RTC_IRQ, NULL);
#endif
-#endif /* __sparc__ */
+#endif /* CONFIG_SPARC32 */
}
module_init(rtc_init);
spin_unlock_irq(&rtc_lock);
- printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", freq);
+ if (printk_ratelimit())
+ printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", freq);
/* Now we have new data */
wake_up_interruptible(&rtc_wait);
}
#endif
+#ifdef CONFIG_PROC_FS
/*
* Info exported via "/proc/driver/rtc".
*/
{
return single_open(file, rtc_proc_show, NULL);
}
+#endif
void rtc_get_rtc_time(struct rtc_time *rtc_tm)
{
- unsigned long uip_watchdog = jiffies;
+ unsigned long uip_watchdog = jiffies, flags;
unsigned char ctrl;
#ifdef CONFIG_MACH_DECSTATION
unsigned int real_year;
/*
* read RTC once any update in progress is done. The update
- * can take just over 2ms. We wait 10 to 20ms. There is no need to
+ * can take just over 2ms. We wait 20ms. There is no need to
* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
* If you need to know *exactly* when a second has started, enable
* periodic update complete interrupts, (via ioctl) and then
* Once the read clears, read the RTC time (again via ioctl). Easy.
*/
- if (rtc_is_updating() != 0)
- while (jiffies - uip_watchdog < 2*HZ/100) {
- barrier();
- cpu_relax();
- }
+ while (rtc_is_updating() != 0 && jiffies - uip_watchdog < 2*HZ/100)
+ cpu_relax();
/*
* Only the values that we read from the RTC are set. We leave
- * tm_wday, tm_yday and tm_isdst untouched. Even though the
- * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
- * by the RTC when initially set to a non-zero value.
+ * tm_wday, tm_yday and tm_isdst untouched. Note that while the
+ * RTC has RTC_DAY_OF_WEEK, we should usually ignore it, as it is
+ * only updated by the RTC when initially set to a non-zero value.
*/
- spin_lock_irq(&rtc_lock);
+ spin_lock_irqsave(&rtc_lock, flags);
rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS);
rtc_tm->tm_min = CMOS_READ(RTC_MINUTES);
rtc_tm->tm_hour = CMOS_READ(RTC_HOURS);
rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH);
rtc_tm->tm_mon = CMOS_READ(RTC_MONTH);
rtc_tm->tm_year = CMOS_READ(RTC_YEAR);
+ /* Only set from 2.6.16 onwards */
+ rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK);
+
#ifdef CONFIG_MACH_DECSTATION
real_year = CMOS_READ(RTC_DEC_YEAR);
#endif
ctrl = CMOS_READ(RTC_CONTROL);
- spin_unlock_irq(&rtc_lock);
+ spin_unlock_irqrestore(&rtc_lock, flags);
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
{
BCD_TO_BIN(rtc_tm->tm_mday);
BCD_TO_BIN(rtc_tm->tm_mon);
BCD_TO_BIN(rtc_tm->tm_year);
+ BCD_TO_BIN(rtc_tm->tm_wday);
}
#ifdef CONFIG_MACH_DECSTATION
* meddles with the interrupt enable/disable bits.
*/
-static void mask_rtc_irq_bit(unsigned char bit)
+static void mask_rtc_irq_bit_locked(unsigned char bit)
{
unsigned char val;
- spin_lock_irq(&rtc_lock);
- if (hpet_mask_rtc_irq_bit(bit)) {
- spin_unlock_irq(&rtc_lock);
+ if (hpet_mask_rtc_irq_bit(bit))
return;
- }
val = CMOS_READ(RTC_CONTROL);
val &= ~bit;
CMOS_WRITE(val, RTC_CONTROL);
CMOS_READ(RTC_INTR_FLAGS);
rtc_irq_data = 0;
- spin_unlock_irq(&rtc_lock);
}
-static void set_rtc_irq_bit(unsigned char bit)
+static void set_rtc_irq_bit_locked(unsigned char bit)
{
unsigned char val;
- spin_lock_irq(&rtc_lock);
- if (hpet_set_rtc_irq_bit(bit)) {
- spin_unlock_irq(&rtc_lock);
+ if (hpet_set_rtc_irq_bit(bit))
return;
- }
val = CMOS_READ(RTC_CONTROL);
val |= bit;
CMOS_WRITE(val, RTC_CONTROL);
CMOS_READ(RTC_INTR_FLAGS);
rtc_irq_data = 0;
- spin_unlock_irq(&rtc_lock);
}
#endif