1 files changed, 328 insertions, 0 deletions

diff --git a/arch/sparc/kernel/time_32.c b/arch/sparc/kernel/time_32.c
new file mode 100644
index 000000000000..00f7383c7657
--- /dev/null
+++ b/arch/sparc/kernel/time_32.c
@@ -0,0 +1,328 @@
+/* linux/arch/sparc/kernel/time.c
+ *
+ * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
+ *
+ * Chris Davis (cdavis@cois.on.ca) 03/27/1998
+ * Added support for the intersil on the sun4/4200
+ *
+ * Gleb Raiko (rajko@mech.math.msu.su) 08/18/1998
+ * Support for MicroSPARC-IIep, PCI CPU.
+ *
+ * This file handles the Sparc specific time handling details.
+ *
+ * 1997-09-10	Updated NTP code according to technical memorandum Jan '96
+ *		"A Kernel Model for Precision Timekeeping" by Dave Mills
+ */
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/time.h>
+#include <linux/rtc.h>
+#include <linux/rtc/m48t59.h>
+#include <linux/timex.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/profile.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+#include <asm/oplib.h>
+#include <asm/timer.h>
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/idprom.h>
+#include <asm/machines.h>
+#include <asm/page.h>
+#include <asm/pcic.h>
+#include <asm/irq_regs.h>
+
+#include "irq.h"
+
+DEFINE_SPINLOCK(rtc_lock);
+static int set_rtc_mmss(unsigned long);
+static int sbus_do_settimeofday(struct timespec *tv);
+
+unsigned long profile_pc(struct pt_regs *regs)
+{
+	extern char __copy_user_begin[], __copy_user_end[];
+	extern char __atomic_begin[], __atomic_end[];
+	extern char __bzero_begin[], __bzero_end[];
+
+	unsigned long pc = regs->pc;
+
+	if (in_lock_functions(pc) ||
+	    (pc >= (unsigned long) __copy_user_begin &&
+	     pc < (unsigned long) __copy_user_end) ||
+	    (pc >= (unsigned long) __atomic_begin &&
+	     pc < (unsigned long) __atomic_end) ||
+	    (pc >= (unsigned long) __bzero_begin &&
+	     pc < (unsigned long) __bzero_end))
+		pc = regs->u_regs[UREG_RETPC];
+	return pc;
+}
+
+EXPORT_SYMBOL(profile_pc);
+
+__volatile__ unsigned int *master_l10_counter;
+
+/*
+ * timer_interrupt() needs to keep up the real-time clock,
+ * as well as call the "do_timer()" routine every clocktick
+ */
+
+#define TICK_SIZE (tick_nsec / 1000)
+
+static irqreturn_t timer_interrupt(int dummy, void *dev_id)
+{
+	/* last time the cmos clock got updated */
+	static long last_rtc_update;
+
+#ifndef CONFIG_SMP
+	profile_tick(CPU_PROFILING);
+#endif
+
+	/* Protect counter clear so that do_gettimeoffset works */
+	write_seqlock(&xtime_lock);
+
+	clear_clock_irq();
+
+	do_timer(1);
+
+	/* Determine when to update the Mostek clock. */
+	if (ntp_synced() &&
+	    xtime.tv_sec > last_rtc_update + 660 &&
+	    (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
+	    (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
+	  if (set_rtc_mmss(xtime.tv_sec) == 0)
+	    last_rtc_update = xtime.tv_sec;
+	  else
+	    last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */
+	}
+	write_sequnlock(&xtime_lock);
+
+#ifndef CONFIG_SMP
+	update_process_times(user_mode(get_irq_regs()));
+#endif
+	return IRQ_HANDLED;
+}
+
+static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct m48t59_plat_data *pdata = pdev->dev.platform_data;
+
+	return readb(pdata->ioaddr + ofs);
+}
+
+static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct m48t59_plat_data *pdata = pdev->dev.platform_data;
+
+	writeb(val, pdata->ioaddr + ofs);
+}
+
+static struct m48t59_plat_data m48t59_data = {
+	.read_byte = mostek_read_byte,
+	.write_byte = mostek_write_byte,
+};
+
+/* resource is set at runtime */
+static struct platform_device m48t59_rtc = {
+	.name		= "rtc-m48t59",
+	.id		= 0,
+	.num_resources	= 1,
+	.dev	= {
+		.platform_data = &m48t59_data,
+	},
+};
+
+static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match)
+{
+	struct device_node *dp = op->node;
+	const char *model = of_get_property(dp, "model", NULL);
+
+	if (!model)
+		return -ENODEV;
+
+	m48t59_rtc.resource = &op->resource[0];
+	if (!strcmp(model, "mk48t02")) {
+		/* Map the clock register io area read-only */
+		m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0,
+						2048, "rtc-m48t59");
+		m48t59_data.type = M48T59RTC_TYPE_M48T02;
+	} else if (!strcmp(model, "mk48t08")) {
+		m48t59_data.ioaddr = of_ioremap(&op->resource[0], 0,
+						8192, "rtc-m48t59");
+		m48t59_data.type = M48T59RTC_TYPE_M48T08;
+	} else
+		return -ENODEV;
+
+	if (platform_device_register(&m48t59_rtc) < 0)
+		printk(KERN_ERR "Registering RTC device failed\n");
+
+	return 0;
+}
+
+static struct of_device_id __initdata clock_match[] = {
+	{
+		.name = "eeprom",
+	},
+	{},
+};
+
+static struct of_platform_driver clock_driver = {
+	.match_table	= clock_match,
+	.probe		= clock_probe,
+	.driver		= {
+		.name	= "rtc",
+	},
+};
+
+
+/* Probe for the mostek real time clock chip. */
+static int __init clock_init(void)
+{
+	return of_register_driver(&clock_driver, &of_platform_bus_type);
+}
+
+/* Must be after subsys_initcall() so that busses are probed.  Must
+ * be before device_initcall() because things like the RTC driver
+ * need to see the clock registers.
+ */
+fs_initcall(clock_init);
+
+static void __init sbus_time_init(void)
+{
+
+	BTFIXUPSET_CALL(bus_do_settimeofday, sbus_do_settimeofday, BTFIXUPCALL_NORM);
+	btfixup();
+
+	sparc_init_timers(timer_interrupt);
+	
+	/* Now that OBP ticker has been silenced, it is safe to enable IRQ. */
+	local_irq_enable();
+}
+
+void __init time_init(void)
+{
+#ifdef CONFIG_PCI
+	extern void pci_time_init(void);
+	if (pcic_present()) {
+		pci_time_init();
+		return;
+	}
+#endif
+	sbus_time_init();
+}
+
+static inline unsigned long do_gettimeoffset(void)
+{
+	unsigned long val = *master_l10_counter;
+	unsigned long usec = (val >> 10) & 0x1fffff;
+
+	/* Limit hit?  */
+	if (val & 0x80000000)
+		usec += 1000000 / HZ;
+
+	return usec;
+}
+
+/* Ok, my cute asm atomicity trick doesn't work anymore.
+ * There are just too many variables that need to be protected
+ * now (both members of xtime, et al.)
+ */
+void do_gettimeofday(struct timeval *tv)
+{
+	unsigned long flags;
+	unsigned long seq;
+	unsigned long usec, sec;
+	unsigned long max_ntp_tick = tick_usec - tickadj;
+
+	do {
+		seq = read_seqbegin_irqsave(&xtime_lock, flags);
+		usec = do_gettimeoffset();
+
+		/*
+		 * If time_adjust is negative then NTP is slowing the clock
+		 * so make sure not to go into next possible interval.
+		 * Better to lose some accuracy than have time go backwards..
+		 */
+		if (unlikely(time_adjust < 0))
+			usec = min(usec, max_ntp_tick);
+
+		sec = xtime.tv_sec;
+		usec += (xtime.tv_nsec / 1000);
+	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
+
+	while (usec >= 1000000) {
+		usec -= 1000000;
+		sec++;
+	}
+
+	tv->tv_sec = sec;
+	tv->tv_usec = usec;
+}
+
+EXPORT_SYMBOL(do_gettimeofday);
+
+int do_settimeofday(struct timespec *tv)
+{
+	int ret;
+
+	write_seqlock_irq(&xtime_lock);
+	ret = bus_do_settimeofday(tv);
+	write_sequnlock_irq(&xtime_lock);
+	clock_was_set();
+	return ret;
+}
+
+EXPORT_SYMBOL(do_settimeofday);
+
+static int sbus_do_settimeofday(struct timespec *tv)
+{
+	time_t wtm_sec, sec = tv->tv_sec;
+	long wtm_nsec, nsec = tv->tv_nsec;
+
+	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
+		return -EINVAL;
+
+	/*
+	 * This is revolting. We need to set "xtime" correctly. However, the
+	 * value in this location is the value at the most recent update of
+	 * wall time.  Discover what correction gettimeofday() would have
+	 * made, and then undo it!
+	 */
+	nsec -= 1000 * do_gettimeoffset();
+
+	wtm_sec  = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
+	wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
+
+	set_normalized_timespec(&xtime, sec, nsec);
+	set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
+
+	ntp_clear();
+	return 0;
+}
+
+static int set_rtc_mmss(unsigned long secs)
+{
+	struct rtc_device *rtc = rtc_class_open("rtc0");
+	int err = -1;
+
+	if (rtc) {
+		err = rtc_set_mmss(rtc, secs);
+		rtc_class_close(rtc);
+	}
+
+	return err;
+}