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linux_old1/arch/sparc64/kernel/time.c

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/* $Id: time.c,v 1.42 2002/01/23 14:33:55 davem Exp $
* time.c: UltraSparc timer and TOD clock support.
*
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
*
* Based largely on code which is:
*
* Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
*/
#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/timex.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/mc146818rtc.h>
#include <linux/delay.h>
#include <linux/profile.h>
#include <linux/bcd.h>
#include <linux/jiffies.h>
#include <linux/cpufreq.h>
#include <linux/percpu.h>
#include <linux/profile.h>
#include <linux/miscdevice.h>
#include <linux/rtc.h>
#include <linux/kernel_stat.h>
#include <linux/clockchips.h>
#include <linux/clocksource.h>
#include <asm/oplib.h>
#include <asm/mostek.h>
#include <asm/timer.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/of_device.h>
#include <asm/starfire.h>
#include <asm/smp.h>
#include <asm/sections.h>
#include <asm/cpudata.h>
#include <asm/uaccess.h>
#include <asm/prom.h>
#include <asm/irq_regs.h>
DEFINE_SPINLOCK(mostek_lock);
DEFINE_SPINLOCK(rtc_lock);
void __iomem *mstk48t02_regs = NULL;
#ifdef CONFIG_PCI
unsigned long ds1287_regs = 0UL;
static void __iomem *bq4802_regs;
#endif
static void __iomem *mstk48t08_regs;
static void __iomem *mstk48t59_regs;
static int set_rtc_mmss(unsigned long);
#define TICK_PRIV_BIT (1UL << 63)
#define TICKCMP_IRQ_BIT (1UL << 63)
#ifdef CONFIG_SMP
unsigned long profile_pc(struct pt_regs *regs)
{
unsigned long pc = instruction_pointer(regs);
if (in_lock_functions(pc))
return regs->u_regs[UREG_RETPC];
return pc;
}
EXPORT_SYMBOL(profile_pc);
#endif
static void tick_disable_protection(void)
{
/* Set things up so user can access tick register for profiling
* purposes. Also workaround BB_ERRATA_1 by doing a dummy
* read back of %tick after writing it.
*/
__asm__ __volatile__(
" ba,pt %%xcc, 1f\n"
" nop\n"
" .align 64\n"
"1: rd %%tick, %%g2\n"
" add %%g2, 6, %%g2\n"
" andn %%g2, %0, %%g2\n"
" wrpr %%g2, 0, %%tick\n"
" rdpr %%tick, %%g0"
: /* no outputs */
: "r" (TICK_PRIV_BIT)
: "g2");
}
static void tick_disable_irq(void)
{
__asm__ __volatile__(
" ba,pt %%xcc, 1f\n"
" nop\n"
" .align 64\n"
"1: wr %0, 0x0, %%tick_cmpr\n"
" rd %%tick_cmpr, %%g0"
: /* no outputs */
: "r" (TICKCMP_IRQ_BIT));
}
static void tick_init_tick(void)
{
tick_disable_protection();
tick_disable_irq();
}
static unsigned long tick_get_tick(void)
{
unsigned long ret;
__asm__ __volatile__("rd %%tick, %0\n\t"
"mov %0, %0"
: "=r" (ret));
return ret & ~TICK_PRIV_BIT;
}
static int tick_add_compare(unsigned long adj)
{
unsigned long orig_tick, new_tick, new_compare;
__asm__ __volatile__("rd %%tick, %0"
: "=r" (orig_tick));
orig_tick &= ~TICKCMP_IRQ_BIT;
/* Workaround for Spitfire Errata (#54 I think??), I discovered
* this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
* number 103640.
*
* On Blackbird writes to %tick_cmpr can fail, the
* workaround seems to be to execute the wr instruction
* at the start of an I-cache line, and perform a dummy
* read back from %tick_cmpr right after writing to it. -DaveM
*/
__asm__ __volatile__("ba,pt %%xcc, 1f\n\t"
" add %1, %2, %0\n\t"
".align 64\n"
"1:\n\t"
"wr %0, 0, %%tick_cmpr\n\t"
"rd %%tick_cmpr, %%g0\n\t"
: "=r" (new_compare)
: "r" (orig_tick), "r" (adj));
__asm__ __volatile__("rd %%tick, %0"
: "=r" (new_tick));
new_tick &= ~TICKCMP_IRQ_BIT;
return ((long)(new_tick - (orig_tick+adj))) > 0L;
}
static unsigned long tick_add_tick(unsigned long adj)
{
unsigned long new_tick;
/* Also need to handle Blackbird bug here too. */
__asm__ __volatile__("rd %%tick, %0\n\t"
"add %0, %1, %0\n\t"
"wrpr %0, 0, %%tick\n\t"
: "=&r" (new_tick)
: "r" (adj));
return new_tick;
}
static struct sparc64_tick_ops tick_operations __read_mostly = {
.name = "tick",
.init_tick = tick_init_tick,
.disable_irq = tick_disable_irq,
.get_tick = tick_get_tick,
.add_tick = tick_add_tick,
.add_compare = tick_add_compare,
.softint_mask = 1UL << 0,
};
struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
static void stick_disable_irq(void)
{
__asm__ __volatile__(
"wr %0, 0x0, %%asr25"
: /* no outputs */
: "r" (TICKCMP_IRQ_BIT));
}
static void stick_init_tick(void)
{
/* Writes to the %tick and %stick register are not
* allowed on sun4v. The Hypervisor controls that
* bit, per-strand.
*/
if (tlb_type != hypervisor) {
tick_disable_protection();
tick_disable_irq();
/* Let the user get at STICK too. */
__asm__ __volatile__(
" rd %%asr24, %%g2\n"
" andn %%g2, %0, %%g2\n"
" wr %%g2, 0, %%asr24"
: /* no outputs */
: "r" (TICK_PRIV_BIT)
: "g1", "g2");
}
stick_disable_irq();
}
static unsigned long stick_get_tick(void)
{
unsigned long ret;
__asm__ __volatile__("rd %%asr24, %0"
: "=r" (ret));
return ret & ~TICK_PRIV_BIT;
}
static unsigned long stick_add_tick(unsigned long adj)
{
unsigned long new_tick;
__asm__ __volatile__("rd %%asr24, %0\n\t"
"add %0, %1, %0\n\t"
"wr %0, 0, %%asr24\n\t"
: "=&r" (new_tick)
: "r" (adj));
return new_tick;
}
static int stick_add_compare(unsigned long adj)
{
unsigned long orig_tick, new_tick;
__asm__ __volatile__("rd %%asr24, %0"
: "=r" (orig_tick));
orig_tick &= ~TICKCMP_IRQ_BIT;
__asm__ __volatile__("wr %0, 0, %%asr25"
: /* no outputs */
: "r" (orig_tick + adj));
__asm__ __volatile__("rd %%asr24, %0"
: "=r" (new_tick));
new_tick &= ~TICKCMP_IRQ_BIT;
return ((long)(new_tick - (orig_tick+adj))) > 0L;
}
static struct sparc64_tick_ops stick_operations __read_mostly = {
.name = "stick",
.init_tick = stick_init_tick,
.disable_irq = stick_disable_irq,
.get_tick = stick_get_tick,
.add_tick = stick_add_tick,
.add_compare = stick_add_compare,
.softint_mask = 1UL << 16,
};
/* On Hummingbird the STICK/STICK_CMPR register is implemented
* in I/O space. There are two 64-bit registers each, the
* first holds the low 32-bits of the value and the second holds
* the high 32-bits.
*
* Since STICK is constantly updating, we have to access it carefully.
*
* The sequence we use to read is:
* 1) read high
* 2) read low
* 3) read high again, if it rolled re-read both low and high again.
*
* Writing STICK safely is also tricky:
* 1) write low to zero
* 2) write high
* 3) write low
*/
#define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL
#define HBIRD_STICK_ADDR 0x1fe0000f070UL
static unsigned long __hbird_read_stick(void)
{
unsigned long ret, tmp1, tmp2, tmp3;
unsigned long addr = HBIRD_STICK_ADDR+8;
__asm__ __volatile__("ldxa [%1] %5, %2\n"
"1:\n\t"
"sub %1, 0x8, %1\n\t"
"ldxa [%1] %5, %3\n\t"
"add %1, 0x8, %1\n\t"
"ldxa [%1] %5, %4\n\t"
"cmp %4, %2\n\t"
"bne,a,pn %%xcc, 1b\n\t"
" mov %4, %2\n\t"
"sllx %4, 32, %4\n\t"
"or %3, %4, %0\n\t"
: "=&r" (ret), "=&r" (addr),
"=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
: "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
return ret;
}
static void __hbird_write_stick(unsigned long val)
{
unsigned long low = (val & 0xffffffffUL);
unsigned long high = (val >> 32UL);
unsigned long addr = HBIRD_STICK_ADDR;
__asm__ __volatile__("stxa %%g0, [%0] %4\n\t"
"add %0, 0x8, %0\n\t"
"stxa %3, [%0] %4\n\t"
"sub %0, 0x8, %0\n\t"
"stxa %2, [%0] %4"
: "=&r" (addr)
: "0" (addr), "r" (low), "r" (high),
"i" (ASI_PHYS_BYPASS_EC_E));
}
static void __hbird_write_compare(unsigned long val)
{
unsigned long low = (val & 0xffffffffUL);
unsigned long high = (val >> 32UL);
unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
__asm__ __volatile__("stxa %3, [%0] %4\n\t"
"sub %0, 0x8, %0\n\t"
"stxa %2, [%0] %4"
: "=&r" (addr)
: "0" (addr), "r" (low), "r" (high),
"i" (ASI_PHYS_BYPASS_EC_E));
}
static void hbtick_disable_irq(void)
{
__hbird_write_compare(TICKCMP_IRQ_BIT);
}
static void hbtick_init_tick(void)
{
tick_disable_protection();
/* XXX This seems to be necessary to 'jumpstart' Hummingbird
* XXX into actually sending STICK interrupts. I think because
* XXX of how we store %tick_cmpr in head.S this somehow resets the
* XXX {TICK + STICK} interrupt mux. -DaveM
*/
__hbird_write_stick(__hbird_read_stick());
hbtick_disable_irq();
}
static unsigned long hbtick_get_tick(void)
{
return __hbird_read_stick() & ~TICK_PRIV_BIT;
}
static unsigned long hbtick_add_tick(unsigned long adj)
{
unsigned long val;
val = __hbird_read_stick() + adj;
__hbird_write_stick(val);
return val;
}
static int hbtick_add_compare(unsigned long adj)
{
unsigned long val = __hbird_read_stick();
unsigned long val2;
val &= ~TICKCMP_IRQ_BIT;
val += adj;
__hbird_write_compare(val);
val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
return ((long)(val2 - val)) > 0L;
}
static struct sparc64_tick_ops hbtick_operations __read_mostly = {
.name = "hbtick",
.init_tick = hbtick_init_tick,
.disable_irq = hbtick_disable_irq,
.get_tick = hbtick_get_tick,
.add_tick = hbtick_add_tick,
.add_compare = hbtick_add_compare,
.softint_mask = 1UL << 0,
};
static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
#define TICK_SIZE (tick_nsec / 1000)
#define USEC_AFTER 500000
#define USEC_BEFORE 500000
static void sync_cmos_clock(unsigned long dummy);
static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
static void sync_cmos_clock(unsigned long dummy)
{
struct timeval now, next;
int fail = 1;
/*
* If we have an externally synchronized Linux clock, then update
* CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
* called as close as possible to 500 ms before the new second starts.
* This code is run on a timer. If the clock is set, that timer
* may not expire at the correct time. Thus, we adjust...
*/
if (!ntp_synced())
/*
* Not synced, exit, do not restart a timer (if one is
* running, let it run out).
*/
return;
do_gettimeofday(&now);
if (now.tv_usec >= USEC_AFTER - ((unsigned) TICK_SIZE) / 2 &&
now.tv_usec <= USEC_BEFORE + ((unsigned) TICK_SIZE) / 2)
fail = set_rtc_mmss(now.tv_sec);
next.tv_usec = USEC_AFTER - now.tv_usec;
if (next.tv_usec <= 0)
next.tv_usec += USEC_PER_SEC;
if (!fail)
next.tv_sec = 659;
else
next.tv_sec = 0;
if (next.tv_usec >= USEC_PER_SEC) {
next.tv_sec++;
next.tv_usec -= USEC_PER_SEC;
}
mod_timer(&sync_cmos_timer, jiffies + timeval_to_jiffies(&next));
}
void notify_arch_cmos_timer(void)
{
mod_timer(&sync_cmos_timer, jiffies + 1);
}
/* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
static void __init kick_start_clock(void)
{
void __iomem *regs = mstk48t02_regs;
u8 sec, tmp;
int i, count;
prom_printf("CLOCK: Clock was stopped. Kick start ");
spin_lock_irq(&mostek_lock);
/* Turn on the kick start bit to start the oscillator. */
tmp = mostek_read(regs + MOSTEK_CREG);
tmp |= MSTK_CREG_WRITE;
mostek_write(regs + MOSTEK_CREG, tmp);
tmp = mostek_read(regs + MOSTEK_SEC);
tmp &= ~MSTK_STOP;
mostek_write(regs + MOSTEK_SEC, tmp);
tmp = mostek_read(regs + MOSTEK_HOUR);
tmp |= MSTK_KICK_START;
mostek_write(regs + MOSTEK_HOUR, tmp);
tmp = mostek_read(regs + MOSTEK_CREG);
tmp &= ~MSTK_CREG_WRITE;
mostek_write(regs + MOSTEK_CREG, tmp);
spin_unlock_irq(&mostek_lock);
/* Delay to allow the clock oscillator to start. */
sec = MSTK_REG_SEC(regs);
for (i = 0; i < 3; i++) {
while (sec == MSTK_REG_SEC(regs))
for (count = 0; count < 100000; count++)
/* nothing */ ;
prom_printf(".");
sec = MSTK_REG_SEC(regs);
}
prom_printf("\n");
spin_lock_irq(&mostek_lock);
/* Turn off kick start and set a "valid" time and date. */
tmp = mostek_read(regs + MOSTEK_CREG);
tmp |= MSTK_CREG_WRITE;
mostek_write(regs + MOSTEK_CREG, tmp);
tmp = mostek_read(regs + MOSTEK_HOUR);
tmp &= ~MSTK_KICK_START;
mostek_write(regs + MOSTEK_HOUR, tmp);
MSTK_SET_REG_SEC(regs,0);
MSTK_SET_REG_MIN(regs,0);
MSTK_SET_REG_HOUR(regs,0);
MSTK_SET_REG_DOW(regs,5);
MSTK_SET_REG_DOM(regs,1);
MSTK_SET_REG_MONTH(regs,8);
MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
tmp = mostek_read(regs + MOSTEK_CREG);
tmp &= ~MSTK_CREG_WRITE;
mostek_write(regs + MOSTEK_CREG, tmp);
spin_unlock_irq(&mostek_lock);
/* Ensure the kick start bit is off. If it isn't, turn it off. */
while (mostek_read(regs + MOSTEK_HOUR) & MSTK_KICK_START) {
prom_printf("CLOCK: Kick start still on!\n");
spin_lock_irq(&mostek_lock);
tmp = mostek_read(regs + MOSTEK_CREG);
tmp |= MSTK_CREG_WRITE;
mostek_write(regs + MOSTEK_CREG, tmp);
tmp = mostek_read(regs + MOSTEK_HOUR);
tmp &= ~MSTK_KICK_START;
mostek_write(regs + MOSTEK_HOUR, tmp);
tmp = mostek_read(regs + MOSTEK_CREG);
tmp &= ~MSTK_CREG_WRITE;
mostek_write(regs + MOSTEK_CREG, tmp);
spin_unlock_irq(&mostek_lock);
}
prom_printf("CLOCK: Kick start procedure successful.\n");
}
/* Return nonzero if the clock chip battery is low. */
static int __init has_low_battery(void)
{
void __iomem *regs = mstk48t02_regs;
u8 data1, data2;
spin_lock_irq(&mostek_lock);
data1 = mostek_read(regs + MOSTEK_EEPROM); /* Read some data. */
mostek_write(regs + MOSTEK_EEPROM, ~data1); /* Write back the complement. */
data2 = mostek_read(regs + MOSTEK_EEPROM); /* Read back the complement. */
mostek_write(regs + MOSTEK_EEPROM, data1); /* Restore original value. */
spin_unlock_irq(&mostek_lock);
return (data1 == data2); /* Was the write blocked? */
}
/* Probe for the real time clock chip. */
static void __init set_system_time(void)
{
unsigned int year, mon, day, hour, min, sec;
void __iomem *mregs = mstk48t02_regs;
#ifdef CONFIG_PCI
unsigned long dregs = ds1287_regs;
void __iomem *bregs = bq4802_regs;
#else
unsigned long dregs = 0UL;
void __iomem *bregs = 0UL;
#endif
u8 tmp;
if (!mregs && !dregs && !bregs) {
prom_printf("Something wrong, clock regs not mapped yet.\n");
prom_halt();
}
if (mregs) {
spin_lock_irq(&mostek_lock);
/* Traditional Mostek chip. */
tmp = mostek_read(mregs + MOSTEK_CREG);
tmp |= MSTK_CREG_READ;
mostek_write(mregs + MOSTEK_CREG, tmp);
sec = MSTK_REG_SEC(mregs);
min = MSTK_REG_MIN(mregs);
hour = MSTK_REG_HOUR(mregs);
day = MSTK_REG_DOM(mregs);
mon = MSTK_REG_MONTH(mregs);
year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
} else if (bregs) {
unsigned char val = readb(bregs + 0x0e);
unsigned int century;
/* BQ4802 RTC chip. */
writeb(val | 0x08, bregs + 0x0e);
sec = readb(bregs + 0x00);
min = readb(bregs + 0x02);
hour = readb(bregs + 0x04);
day = readb(bregs + 0x06);
mon = readb(bregs + 0x09);
year = readb(bregs + 0x0a);
century = readb(bregs + 0x0f);
writeb(val, bregs + 0x0e);
BCD_TO_BIN(sec);
BCD_TO_BIN(min);
BCD_TO_BIN(hour);
BCD_TO_BIN(day);
BCD_TO_BIN(mon);
BCD_TO_BIN(year);
BCD_TO_BIN(century);
year += (century * 100);
} else {
/* Dallas 12887 RTC chip. */
do {
sec = CMOS_READ(RTC_SECONDS);
min = CMOS_READ(RTC_MINUTES);
hour = CMOS_READ(RTC_HOURS);
day = CMOS_READ(RTC_DAY_OF_MONTH);
mon = CMOS_READ(RTC_MONTH);
year = CMOS_READ(RTC_YEAR);
} while (sec != CMOS_READ(RTC_SECONDS));
if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
BCD_TO_BIN(sec);
BCD_TO_BIN(min);
BCD_TO_BIN(hour);
BCD_TO_BIN(day);
BCD_TO_BIN(mon);
BCD_TO_BIN(year);
}
if ((year += 1900) < 1970)
year += 100;
}
xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
if (mregs) {
tmp = mostek_read(mregs + MOSTEK_CREG);
tmp &= ~MSTK_CREG_READ;
mostek_write(mregs + MOSTEK_CREG, tmp);
spin_unlock_irq(&mostek_lock);
}
}
/* davem suggests we keep this within the 4M locked kernel image */
static u32 starfire_get_time(void)
{
static char obp_gettod[32];
static u32 unix_tod;
sprintf(obp_gettod, "h# %08x unix-gettod",
(unsigned int) (long) &unix_tod);
prom_feval(obp_gettod);
return unix_tod;
}
static int starfire_set_time(u32 val)
{
/* Do nothing, time is set using the service processor
* console on this platform.
*/
return 0;
}
static u32 hypervisor_get_time(void)
{
unsigned long ret, time;
int retries = 10000;
retry:
ret = sun4v_tod_get(&time);
if (ret == HV_EOK)
return time;
if (ret == HV_EWOULDBLOCK) {
if (--retries > 0) {
udelay(100);
goto retry;
}
printk(KERN_WARNING "SUN4V: tod_get() timed out.\n");
return 0;
}
printk(KERN_WARNING "SUN4V: tod_get() not supported.\n");
return 0;
}
static int hypervisor_set_time(u32 secs)
{
unsigned long ret;
int retries = 10000;
retry:
ret = sun4v_tod_set(secs);
if (ret == HV_EOK)
return 0;
if (ret == HV_EWOULDBLOCK) {
if (--retries > 0) {
udelay(100);
goto retry;
}
printk(KERN_WARNING "SUN4V: tod_set() timed out.\n");
return -EAGAIN;
}
printk(KERN_WARNING "SUN4V: tod_set() not supported.\n");
return -EOPNOTSUPP;
}
static int __init clock_model_matches(const char *model)
{
if (strcmp(model, "mk48t02") &&
strcmp(model, "mk48t08") &&
strcmp(model, "mk48t59") &&
strcmp(model, "m5819") &&
strcmp(model, "m5819p") &&
strcmp(model, "m5823") &&
strcmp(model, "ds1287") &&
strcmp(model, "bq4802"))
return 0;
return 1;
}
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);
const char *compat = of_get_property(dp, "compatible", NULL);
unsigned long size, flags;
void __iomem *regs;
if (!model)
model = compat;
if (!model || !clock_model_matches(model))
return -ENODEV;
/* On an Enterprise system there can be multiple mostek clocks.
* We should only match the one that is on the central FHC bus.
*/
if (!strcmp(dp->parent->name, "fhc") &&
strcmp(dp->parent->parent->name, "central") != 0)
return -ENODEV;
size = (op->resource[0].end - op->resource[0].start) + 1;
regs = of_ioremap(&op->resource[0], 0, size, "clock");
if (!regs)
return -ENOMEM;
#ifdef CONFIG_PCI
if (!strcmp(model, "ds1287") ||
!strcmp(model, "m5819") ||
!strcmp(model, "m5819p") ||
!strcmp(model, "m5823")) {
ds1287_regs = (unsigned long) regs;
} else if (!strcmp(model, "bq4802")) {
bq4802_regs = regs;
} else
#endif
if (model[5] == '0' && model[6] == '2') {
mstk48t02_regs = regs;
} else if(model[5] == '0' && model[6] == '8') {
mstk48t08_regs = regs;
mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02;
} else {
mstk48t59_regs = regs;
mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
}
printk(KERN_INFO "%s: Clock regs at %p\n", dp->full_name, regs);
local_irq_save(flags);
if (mstk48t02_regs != NULL) {
/* Report a low battery voltage condition. */
if (has_low_battery())
prom_printf("NVRAM: Low battery voltage!\n");
/* Kick start the clock if it is completely stopped. */
if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
kick_start_clock();
}
set_system_time();
local_irq_restore(flags);
return 0;
}
static struct of_device_id clock_match[] = {
{
.name = "eeprom",
},
{
.name = "rtc",
},
{},
};
static struct of_platform_driver clock_driver = {
.name = "clock",
.match_table = clock_match,
.probe = clock_probe,
};
static int __init clock_init(void)
{
if (this_is_starfire) {
xtime.tv_sec = starfire_get_time();
xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
return 0;
}
if (tlb_type == hypervisor) {
xtime.tv_sec = hypervisor_get_time();
xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
return 0;
}
return of_register_driver(&clock_driver, &of_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);
/* This is gets the master TICK_INT timer going. */
static unsigned long sparc64_init_timers(void)
{
struct device_node *dp;
unsigned long clock;
#ifdef CONFIG_SMP
extern void smp_tick_init(void);
#endif
dp = of_find_node_by_path("/");
if (tlb_type == spitfire) {
unsigned long ver, manuf, impl;
__asm__ __volatile__ ("rdpr %%ver, %0"
: "=&r" (ver));
manuf = ((ver >> 48) & 0xffff);
impl = ((ver >> 32) & 0xffff);
if (manuf == 0x17 && impl == 0x13) {
/* Hummingbird, aka Ultra-IIe */
tick_ops = &hbtick_operations;
clock = of_getintprop_default(dp, "stick-frequency", 0);
} else {
tick_ops = &tick_operations;
clock = local_cpu_data().clock_tick;
}
} else {
tick_ops = &stick_operations;
clock = of_getintprop_default(dp, "stick-frequency", 0);
}
#ifdef CONFIG_SMP
smp_tick_init();
#endif
return clock;
}
struct freq_table {
unsigned long clock_tick_ref;
unsigned int ref_freq;
};
static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
unsigned long sparc64_get_clock_tick(unsigned int cpu)
{
struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
if (ft->clock_tick_ref)
return ft->clock_tick_ref;
return cpu_data(cpu).clock_tick;
}
#ifdef CONFIG_CPU_FREQ
static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
struct cpufreq_freqs *freq = data;
unsigned int cpu = freq->cpu;
struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
if (!ft->ref_freq) {
ft->ref_freq = freq->old;
ft->clock_tick_ref = cpu_data(cpu).clock_tick;
}
if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) ||
(val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
(val == CPUFREQ_RESUMECHANGE)) {
cpu_data(cpu).clock_tick =
cpufreq_scale(ft->clock_tick_ref,
ft->ref_freq,
freq->new);
}
return 0;
}
static struct notifier_block sparc64_cpufreq_notifier_block = {
.notifier_call = sparc64_cpufreq_notifier
};
#endif /* CONFIG_CPU_FREQ */
static int sparc64_next_event(unsigned long delta,
struct clock_event_device *evt)
{
return tick_ops->add_compare(delta) ? -ETIME : 0;
}
static void sparc64_timer_setup(enum clock_event_mode mode,
struct clock_event_device *evt)
{
switch (mode) {
case CLOCK_EVT_MODE_ONESHOT:
break;
case CLOCK_EVT_MODE_SHUTDOWN:
tick_ops->disable_irq();
break;
case CLOCK_EVT_MODE_PERIODIC:
case CLOCK_EVT_MODE_UNUSED:
WARN_ON(1);
break;
};
}
static struct clock_event_device sparc64_clockevent = {
.features = CLOCK_EVT_FEAT_ONESHOT,
.set_mode = sparc64_timer_setup,
.set_next_event = sparc64_next_event,
.rating = 100,
.shift = 30,
.irq = -1,
};
static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
void timer_interrupt(int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
unsigned long tick_mask = tick_ops->softint_mask;
int cpu = smp_processor_id();
struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
clear_softint(tick_mask);
irq_enter();
kstat_this_cpu.irqs[0]++;
if (unlikely(!evt->event_handler)) {
printk(KERN_WARNING
"Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
} else
evt->event_handler(evt);
irq_exit();
set_irq_regs(old_regs);
}
void __devinit setup_sparc64_timer(void)
{
struct clock_event_device *sevt;
unsigned long pstate;
/* Guarantee that the following sequences execute
* uninterrupted.
*/
__asm__ __volatile__("rdpr %%pstate, %0\n\t"
"wrpr %0, %1, %%pstate"
: "=r" (pstate)
: "i" (PSTATE_IE));
tick_ops->init_tick();
/* Restore PSTATE_IE. */
__asm__ __volatile__("wrpr %0, 0x0, %%pstate"
: /* no outputs */
: "r" (pstate));
sevt = &__get_cpu_var(sparc64_events);
memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
sevt->cpumask = cpumask_of_cpu(smp_processor_id());
clockevents_register_device(sevt);
}
#define SPARC64_NSEC_PER_CYC_SHIFT 10UL
static struct clocksource clocksource_tick = {
.rating = 100,
.mask = CLOCKSOURCE_MASK(64),
.shift = 16,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void __init setup_clockevent_multiplier(unsigned long hz)
{
unsigned long mult, shift = 32;
while (1) {
mult = div_sc(hz, NSEC_PER_SEC, shift);
if (mult && (mult >> 32UL) == 0UL)
break;
shift--;
}
sparc64_clockevent.shift = shift;
sparc64_clockevent.mult = mult;
}
void __init time_init(void)
{
unsigned long clock = sparc64_init_timers();
timer_ticks_per_nsec_quotient =
clocksource_hz2mult(clock, SPARC64_NSEC_PER_CYC_SHIFT);
clocksource_tick.name = tick_ops->name;
clocksource_tick.mult =
clocksource_hz2mult(clock,
clocksource_tick.shift);
clocksource_tick.read = tick_ops->get_tick;
printk("clocksource: mult[%x] shift[%d]\n",
clocksource_tick.mult, clocksource_tick.shift);
clocksource_register(&clocksource_tick);
sparc64_clockevent.name = tick_ops->name;
setup_clockevent_multiplier(clock);
sparc64_clockevent.max_delta_ns =
clockevent_delta2ns(0x7fffffffffffffff, &sparc64_clockevent);
sparc64_clockevent.min_delta_ns =
clockevent_delta2ns(0xF, &sparc64_clockevent);
printk("clockevent: mult[%lx] shift[%d]\n",
sparc64_clockevent.mult, sparc64_clockevent.shift);
setup_sparc64_timer();
#ifdef CONFIG_CPU_FREQ
cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
#endif
}
unsigned long long sched_clock(void)
{
unsigned long ticks = tick_ops->get_tick();
return (ticks * timer_ticks_per_nsec_quotient)
>> SPARC64_NSEC_PER_CYC_SHIFT;
}
static int set_rtc_mmss(unsigned long nowtime)
{
int real_seconds, real_minutes, chip_minutes;
void __iomem *mregs = mstk48t02_regs;
#ifdef CONFIG_PCI
unsigned long dregs = ds1287_regs;
void __iomem *bregs = bq4802_regs;
#else
unsigned long dregs = 0UL;
void __iomem *bregs = 0UL;
#endif
unsigned long flags;
u8 tmp;
/*
* Not having a register set can lead to trouble.
* Also starfire doesn't have a tod clock.
*/
if (!mregs && !dregs & !bregs)
return -1;
if (mregs) {
spin_lock_irqsave(&mostek_lock, flags);
/* Read the current RTC minutes. */
tmp = mostek_read(mregs + MOSTEK_CREG);
tmp |= MSTK_CREG_READ;
mostek_write(mregs + MOSTEK_CREG, tmp);
chip_minutes = MSTK_REG_MIN(mregs);
tmp = mostek_read(mregs + MOSTEK_CREG);
tmp &= ~MSTK_CREG_READ;
mostek_write(mregs + MOSTEK_CREG, tmp);
/*
* since we're only adjusting minutes and seconds,
* don't interfere with hour overflow. This avoids
* messing with unknown time zones but requires your
* RTC not to be off by more than 15 minutes
*/
real_seconds = nowtime % 60;
real_minutes = nowtime / 60;
if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
real_minutes += 30; /* correct for half hour time zone */
real_minutes %= 60;
if (abs(real_minutes - chip_minutes) < 30) {
tmp = mostek_read(mregs + MOSTEK_CREG);
tmp |= MSTK_CREG_WRITE;
mostek_write(mregs + MOSTEK_CREG, tmp);
MSTK_SET_REG_SEC(mregs,real_seconds);
MSTK_SET_REG_MIN(mregs,real_minutes);
tmp = mostek_read(mregs + MOSTEK_CREG);
tmp &= ~MSTK_CREG_WRITE;
mostek_write(mregs + MOSTEK_CREG, tmp);
spin_unlock_irqrestore(&mostek_lock, flags);
return 0;
} else {
spin_unlock_irqrestore(&mostek_lock, flags);
return -1;
}
} else if (bregs) {
int retval = 0;
unsigned char val = readb(bregs + 0x0e);
/* BQ4802 RTC chip. */
writeb(val | 0x08, bregs + 0x0e);
chip_minutes = readb(bregs + 0x02);
BCD_TO_BIN(chip_minutes);
real_seconds = nowtime % 60;
real_minutes = nowtime / 60;
if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
real_minutes += 30;
real_minutes %= 60;
if (abs(real_minutes - chip_minutes) < 30) {
BIN_TO_BCD(real_seconds);
BIN_TO_BCD(real_minutes);
writeb(real_seconds, bregs + 0x00);
writeb(real_minutes, bregs + 0x02);
} else {
printk(KERN_WARNING
"set_rtc_mmss: can't update from %d to %d\n",
chip_minutes, real_minutes);
retval = -1;
}
writeb(val, bregs + 0x0e);
return retval;
} else {
int retval = 0;
unsigned char save_control, save_freq_select;
/* Stolen from arch/i386/kernel/time.c, see there for
* credits and descriptive comments.
*/
spin_lock_irqsave(&rtc_lock, flags);
save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
chip_minutes = CMOS_READ(RTC_MINUTES);
if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
BCD_TO_BIN(chip_minutes);
real_seconds = nowtime % 60;
real_minutes = nowtime / 60;
if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
real_minutes += 30;
real_minutes %= 60;
if (abs(real_minutes - chip_minutes) < 30) {
if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
BIN_TO_BCD(real_seconds);
BIN_TO_BCD(real_minutes);
}
CMOS_WRITE(real_seconds,RTC_SECONDS);
CMOS_WRITE(real_minutes,RTC_MINUTES);
} else {
printk(KERN_WARNING
"set_rtc_mmss: can't update from %d to %d\n",
chip_minutes, real_minutes);
retval = -1;
}
CMOS_WRITE(save_control, RTC_CONTROL);
CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
spin_unlock_irqrestore(&rtc_lock, flags);
return retval;
}
}
#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
static unsigned char mini_rtc_status; /* bitmapped status byte. */
#define FEBRUARY 2
#define STARTOFTIME 1970
#define SECDAY 86400L
#define SECYR (SECDAY * 365)
#define leapyear(year) ((year) % 4 == 0 && \
((year) % 100 != 0 || (year) % 400 == 0))
#define days_in_year(a) (leapyear(a) ? 366 : 365)
#define days_in_month(a) (month_days[(a) - 1])
static int month_days[12] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
/*
* This only works for the Gregorian calendar - i.e. after 1752 (in the UK)
*/
static void GregorianDay(struct rtc_time * tm)
{
int leapsToDate;
int lastYear;
int day;
int MonthOffset[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
lastYear = tm->tm_year - 1;
/*
* Number of leap corrections to apply up to end of last year
*/
leapsToDate = lastYear / 4 - lastYear / 100 + lastYear / 400;
/*
* This year is a leap year if it is divisible by 4 except when it is
* divisible by 100 unless it is divisible by 400
*
* e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 was
*/
day = tm->tm_mon > 2 && leapyear(tm->tm_year);
day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] +
tm->tm_mday;
tm->tm_wday = day % 7;
}
static void to_tm(int tim, struct rtc_time *tm)
{
register int i;
register long hms, day;
day = tim / SECDAY;
hms = tim % SECDAY;
/* Hours, minutes, seconds are easy */
tm->tm_hour = hms / 3600;
tm->tm_min = (hms % 3600) / 60;
tm->tm_sec = (hms % 3600) % 60;
/* Number of years in days */
for (i = STARTOFTIME; day >= days_in_year(i); i++)
day -= days_in_year(i);
tm->tm_year = i;
/* Number of months in days left */
if (leapyear(tm->tm_year))
days_in_month(FEBRUARY) = 29;
for (i = 1; day >= days_in_month(i); i++)
day -= days_in_month(i);
days_in_month(FEBRUARY) = 28;
tm->tm_mon = i;
/* Days are what is left over (+1) from all that. */
tm->tm_mday = day + 1;
/*
* Determine the day of week
*/
GregorianDay(tm);
}
/* Both Starfire and SUN4V give us seconds since Jan 1st, 1970,
* aka Unix time. So we have to convert to/from rtc_time.
*/
static void starfire_get_rtc_time(struct rtc_time *time)
{
u32 seconds = starfire_get_time();
to_tm(seconds, time);
time->tm_year -= 1900;
time->tm_mon -= 1;
}
static int starfire_set_rtc_time(struct rtc_time *time)
{
u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
time->tm_mday, time->tm_hour,
time->tm_min, time->tm_sec);
return starfire_set_time(seconds);
}
static void hypervisor_get_rtc_time(struct rtc_time *time)
{
u32 seconds = hypervisor_get_time();
to_tm(seconds, time);
time->tm_year -= 1900;
time->tm_mon -= 1;
}
static int hypervisor_set_rtc_time(struct rtc_time *time)
{
u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
time->tm_mday, time->tm_hour,
time->tm_min, time->tm_sec);
return hypervisor_set_time(seconds);
}
#ifdef CONFIG_PCI
static void bq4802_get_rtc_time(struct rtc_time *time)
{
unsigned char val = readb(bq4802_regs + 0x0e);
unsigned int century;
writeb(val | 0x08, bq4802_regs + 0x0e);
time->tm_sec = readb(bq4802_regs + 0x00);
time->tm_min = readb(bq4802_regs + 0x02);
time->tm_hour = readb(bq4802_regs + 0x04);
time->tm_mday = readb(bq4802_regs + 0x06);
time->tm_mon = readb(bq4802_regs + 0x09);
time->tm_year = readb(bq4802_regs + 0x0a);
time->tm_wday = readb(bq4802_regs + 0x08);
century = readb(bq4802_regs + 0x0f);
writeb(val, bq4802_regs + 0x0e);
BCD_TO_BIN(time->tm_sec);
BCD_TO_BIN(time->tm_min);
BCD_TO_BIN(time->tm_hour);
BCD_TO_BIN(time->tm_mday);
BCD_TO_BIN(time->tm_mon);
BCD_TO_BIN(time->tm_year);
BCD_TO_BIN(time->tm_wday);
BCD_TO_BIN(century);
time->tm_year += (century * 100);
time->tm_year -= 1900;
time->tm_mon--;
}
static int bq4802_set_rtc_time(struct rtc_time *time)
{
unsigned char val = readb(bq4802_regs + 0x0e);
unsigned char sec, min, hrs, day, mon, yrs, century;
unsigned int year;
year = time->tm_year + 1900;
century = year / 100;
yrs = year % 100;
mon = time->tm_mon + 1; /* tm_mon starts at zero */
day = time->tm_mday;
hrs = time->tm_hour;
min = time->tm_min;
sec = time->tm_sec;
BIN_TO_BCD(sec);
BIN_TO_BCD(min);
BIN_TO_BCD(hrs);
BIN_TO_BCD(day);
BIN_TO_BCD(mon);
BIN_TO_BCD(yrs);
BIN_TO_BCD(century);
writeb(val | 0x08, bq4802_regs + 0x0e);
writeb(sec, bq4802_regs + 0x00);
writeb(min, bq4802_regs + 0x02);
writeb(hrs, bq4802_regs + 0x04);
writeb(day, bq4802_regs + 0x06);
writeb(mon, bq4802_regs + 0x09);
writeb(yrs, bq4802_regs + 0x0a);
writeb(century, bq4802_regs + 0x0f);
writeb(val, bq4802_regs + 0x0e);
return 0;
}
#endif /* CONFIG_PCI */
struct mini_rtc_ops {
void (*get_rtc_time)(struct rtc_time *);
int (*set_rtc_time)(struct rtc_time *);
};
static struct mini_rtc_ops starfire_rtc_ops = {
.get_rtc_time = starfire_get_rtc_time,
.set_rtc_time = starfire_set_rtc_time,
};
static struct mini_rtc_ops hypervisor_rtc_ops = {
.get_rtc_time = hypervisor_get_rtc_time,
.set_rtc_time = hypervisor_set_rtc_time,
};
#ifdef CONFIG_PCI
static struct mini_rtc_ops bq4802_rtc_ops = {
.get_rtc_time = bq4802_get_rtc_time,
.set_rtc_time = bq4802_set_rtc_time,
};
#endif /* CONFIG_PCI */
static struct mini_rtc_ops *mini_rtc_ops;
static inline void mini_get_rtc_time(struct rtc_time *time)
{
unsigned long flags;
spin_lock_irqsave(&rtc_lock, flags);
mini_rtc_ops->get_rtc_time(time);
spin_unlock_irqrestore(&rtc_lock, flags);
}
static inline int mini_set_rtc_time(struct rtc_time *time)
{
unsigned long flags;
int err;
spin_lock_irqsave(&rtc_lock, flags);
err = mini_rtc_ops->set_rtc_time(time);
spin_unlock_irqrestore(&rtc_lock, flags);
return err;
}
static int mini_rtc_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct rtc_time wtime;
void __user *argp = (void __user *)arg;
switch (cmd) {
case RTC_PLL_GET:
return -EINVAL;
case RTC_PLL_SET:
return -EINVAL;
case RTC_UIE_OFF: /* disable ints from RTC updates. */
return 0;
case RTC_UIE_ON: /* enable ints for RTC updates. */
return -EINVAL;
case RTC_RD_TIME: /* Read the time/date from RTC */
/* this doesn't get week-day, who cares */
memset(&wtime, 0, sizeof(wtime));
mini_get_rtc_time(&wtime);
return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;
case RTC_SET_TIME: /* Set the RTC */
{
int year, days;
if (!capable(CAP_SYS_TIME))
return -EACCES;
if (copy_from_user(&wtime, argp, sizeof(wtime)))
return -EFAULT;
year = wtime.tm_year + 1900;
days = month_days[wtime.tm_mon] +
((wtime.tm_mon == 1) && leapyear(year));
if ((wtime.tm_mon < 0 || wtime.tm_mon > 11) ||
(wtime.tm_mday < 1))
return -EINVAL;
if (wtime.tm_mday < 0 || wtime.tm_mday > days)
return -EINVAL;
if (wtime.tm_hour < 0 || wtime.tm_hour >= 24 ||
wtime.tm_min < 0 || wtime.tm_min >= 60 ||
wtime.tm_sec < 0 || wtime.tm_sec >= 60)
return -EINVAL;
return mini_set_rtc_time(&wtime);
}
}
return -EINVAL;
}
static int mini_rtc_open(struct inode *inode, struct file *file)
{
if (mini_rtc_status & RTC_IS_OPEN)
return -EBUSY;
mini_rtc_status |= RTC_IS_OPEN;
return 0;
}
static int mini_rtc_release(struct inode *inode, struct file *file)
{
mini_rtc_status &= ~RTC_IS_OPEN;
return 0;
}
static const struct file_operations mini_rtc_fops = {
.owner = THIS_MODULE,
.ioctl = mini_rtc_ioctl,
.open = mini_rtc_open,
.release = mini_rtc_release,
};
static struct miscdevice rtc_mini_dev =
{
.minor = RTC_MINOR,
.name = "rtc",
.fops = &mini_rtc_fops,
};
static int __init rtc_mini_init(void)
{
int retval;
if (tlb_type == hypervisor)
mini_rtc_ops = &hypervisor_rtc_ops;
else if (this_is_starfire)
mini_rtc_ops = &starfire_rtc_ops;
#ifdef CONFIG_PCI
else if (bq4802_regs)
mini_rtc_ops = &bq4802_rtc_ops;
#endif /* CONFIG_PCI */
else
return -ENODEV;
printk(KERN_INFO "Mini RTC Driver\n");
retval = misc_register(&rtc_mini_dev);
if (retval < 0)
return retval;
return 0;
}
static void __exit rtc_mini_exit(void)
{
misc_deregister(&rtc_mini_dev);
}
module_init(rtc_mini_init);
module_exit(rtc_mini_exit);
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