diff options
Diffstat (limited to 'arch/sparc64/kernel/time.c')
| -rw-r--r-- | arch/sparc64/kernel/time.c | 1190 |
1 files changed, 0 insertions, 1190 deletions
diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c deleted file mode 100644 index 38c5525087a..00000000000 --- a/arch/sparc64/kernel/time.c +++ /dev/null @@ -1,1190 +0,0 @@ -/* $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/config.h> -#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 <asm/oplib.h> -#include <asm/mostek.h> -#include <asm/timer.h> -#include <asm/irq.h> -#include <asm/io.h> -#include <asm/sbus.h> -#include <asm/fhc.h> -#include <asm/pbm.h> -#include <asm/ebus.h> -#include <asm/isa.h> -#include <asm/starfire.h> -#include <asm/smp.h> -#include <asm/sections.h> -#include <asm/cpudata.h> - -DEFINE_SPINLOCK(mostek_lock); -DEFINE_SPINLOCK(rtc_lock); -void __iomem *mstk48t02_regs = NULL; -#ifdef CONFIG_PCI -unsigned long ds1287_regs = 0UL; -#endif - -extern unsigned long wall_jiffies; - -static void __iomem *mstk48t08_regs; -static void __iomem *mstk48t59_regs; - -static int set_rtc_mmss(unsigned long); - -static __init unsigned long dummy_get_tick(void) -{ - return 0; -} - -static __initdata struct sparc64_tick_ops dummy_tick_ops = { - .get_tick = dummy_get_tick, -}; - -struct sparc64_tick_ops *tick_ops __read_mostly = &dummy_tick_ops; - -#define TICK_PRIV_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_init_tick(unsigned long offset) -{ - tick_disable_protection(); - - __asm__ __volatile__( - " rd %%tick, %%g1\n" - " andn %%g1, %1, %%g1\n" - " ba,pt %%xcc, 1f\n" - " add %%g1, %0, %%g1\n" - " .align 64\n" - "1: wr %%g1, 0x0, %%tick_cmpr\n" - " rd %%tick_cmpr, %%g0" - : /* no outputs */ - : "r" (offset), "r" (TICK_PRIV_BIT) - : "g1"); -} - -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 unsigned long tick_get_compare(void) -{ - unsigned long ret; - - __asm__ __volatile__("rd %%tick_cmpr, %0\n\t" - "mov %0, %0" - : "=r" (ret)); - - return ret; -} - -static unsigned long tick_add_compare(unsigned long adj) -{ - unsigned long new_compare; - - /* 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__("rd %%tick_cmpr, %0\n\t" - "ba,pt %%xcc, 1f\n\t" - " add %0, %1, %0\n\t" - ".align 64\n" - "1:\n\t" - "wr %0, 0, %%tick_cmpr\n\t" - "rd %%tick_cmpr, %%g0" - : "=&r" (new_compare) - : "r" (adj)); - - return new_compare; -} - -static unsigned long tick_add_tick(unsigned long adj, unsigned long offset) -{ - unsigned long new_tick, tmp; - - /* Also need to handle Blackbird bug here too. */ - __asm__ __volatile__("rd %%tick, %0\n\t" - "add %0, %2, %0\n\t" - "wrpr %0, 0, %%tick\n\t" - "andn %0, %4, %1\n\t" - "ba,pt %%xcc, 1f\n\t" - " add %1, %3, %1\n\t" - ".align 64\n" - "1:\n\t" - "wr %1, 0, %%tick_cmpr\n\t" - "rd %%tick_cmpr, %%g0" - : "=&r" (new_tick), "=&r" (tmp) - : "r" (adj), "r" (offset), "r" (TICK_PRIV_BIT)); - - return new_tick; -} - -static struct sparc64_tick_ops tick_operations __read_mostly = { - .init_tick = tick_init_tick, - .get_tick = tick_get_tick, - .get_compare = tick_get_compare, - .add_tick = tick_add_tick, - .add_compare = tick_add_compare, - .softint_mask = 1UL << 0, -}; - -static void stick_init_tick(unsigned long offset) -{ - tick_disable_protection(); - - /* 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"); - - __asm__ __volatile__( - " rd %%asr24, %%g1\n" - " andn %%g1, %1, %%g1\n" - " add %%g1, %0, %%g1\n" - " wr %%g1, 0x0, %%asr25" - : /* no outputs */ - : "r" (offset), "r" (TICK_PRIV_BIT) - : "g1"); -} - -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_get_compare(void) -{ - unsigned long ret; - - __asm__ __volatile__("rd %%asr25, %0" - : "=r" (ret)); - - return ret; -} - -static unsigned long stick_add_tick(unsigned long adj, unsigned long offset) -{ - unsigned long new_tick, tmp; - - __asm__ __volatile__("rd %%asr24, %0\n\t" - "add %0, %2, %0\n\t" - "wr %0, 0, %%asr24\n\t" - "andn %0, %4, %1\n\t" - "add %1, %3, %1\n\t" - "wr %1, 0, %%asr25" - : "=&r" (new_tick), "=&r" (tmp) - : "r" (adj), "r" (offset), "r" (TICK_PRIV_BIT)); - - return new_tick; -} - -static unsigned long stick_add_compare(unsigned long adj) -{ - unsigned long new_compare; - - __asm__ __volatile__("rd %%asr25, %0\n\t" - "add %0, %1, %0\n\t" - "wr %0, 0, %%asr25" - : "=&r" (new_compare) - : "r" (adj)); - - return new_compare; -} - -static struct sparc64_tick_ops stick_operations __read_mostly = { - .init_tick = stick_init_tick, - .get_tick = stick_get_tick, - .get_compare = stick_get_compare, - .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 low - * 2) read high - * 3) read low again, if it rolled over increment high by 1 - * - * 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; - - __asm__ __volatile__("ldxa [%1] %5, %2\n\t" - "add %1, 0x8, %1\n\t" - "ldxa [%1] %5, %3\n\t" - "sub %1, 0x8, %1\n\t" - "ldxa [%1] %5, %4\n\t" - "cmp %4, %2\n\t" - "blu,a,pn %%xcc, 1f\n\t" - " add %3, 1, %3\n" - "1:\n\t" - "sllx %3, 32, %3\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 unsigned long __hbird_read_compare(void) -{ - unsigned long low, high; - unsigned long addr = HBIRD_STICKCMP_ADDR; - - __asm__ __volatile__("ldxa [%2] %3, %0\n\t" - "add %2, 0x8, %2\n\t" - "ldxa [%2] %3, %1" - : "=&r" (low), "=&r" (high), "=&r" (addr) - : "i" (ASI_PHYS_BYPASS_EC_E), "2" (addr)); - - return (high << 32UL) | low; -} - -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_init_tick(unsigned long offset) -{ - unsigned long val; - - 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()); - - val = __hbird_read_stick() & ~TICK_PRIV_BIT; - __hbird_write_compare(val + offset); -} - -static unsigned long hbtick_get_tick(void) -{ - return __hbird_read_stick() & ~TICK_PRIV_BIT; -} - -static unsigned long hbtick_get_compare(void) -{ - return __hbird_read_compare(); -} - -static unsigned long hbtick_add_tick(unsigned long adj, unsigned long offset) -{ - unsigned long val; - - val = __hbird_read_stick() + adj; - __hbird_write_stick(val); - - val &= ~TICK_PRIV_BIT; - __hbird_write_compare(val + offset); - - return val; -} - -static unsigned long hbtick_add_compare(unsigned long adj) -{ - unsigned long val = __hbird_read_compare() + adj; - - val &= ~TICK_PRIV_BIT; - __hbird_write_compare(val); - - return val; -} - -static struct sparc64_tick_ops hbtick_operations __read_mostly = { - .init_tick = hbtick_init_tick, - .get_tick = hbtick_get_tick, - .get_compare = hbtick_get_compare, - .add_tick = hbtick_add_tick, - .add_compare = hbtick_add_compare, - .softint_mask = 1UL << 0, -}; - -/* timer_interrupt() needs to keep up the real-time clock, - * as well as call the "do_timer()" routine every clocktick - * - * NOTE: On SUN5 systems the ticker interrupt comes in using 2 - * interrupts, one at level14 and one with softint bit 0. - */ -unsigned long timer_tick_offset __read_mostly; - -static unsigned long timer_ticks_per_nsec_quotient __read_mostly; - -#define TICK_SIZE (tick_nsec / 1000) - -static inline void timer_check_rtc(void) -{ - /* last time the cmos clock got updated */ - static long last_rtc_update; - - /* 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 */ - } -} - -static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs) -{ - unsigned long ticks, compare, pstate; - - write_seqlock(&xtime_lock); - - do { -#ifndef CONFIG_SMP - profile_tick(CPU_PROFILING, regs); - update_process_times(user_mode(regs)); -#endif - do_timer(regs); - - /* Guarantee that the following sequences execute - * uninterrupted. - */ - __asm__ __volatile__("rdpr %%pstate, %0\n\t" - "wrpr %0, %1, %%pstate" - : "=r" (pstate) - : "i" (PSTATE_IE)); - - compare = tick_ops->add_compare(timer_tick_offset); - ticks = tick_ops->get_tick(); - - /* Restore PSTATE_IE. */ - __asm__ __volatile__("wrpr %0, 0x0, %%pstate" - : /* no outputs */ - : "r" (pstate)); - } while (time_after_eq(ticks, compare)); - - timer_check_rtc(); - - write_sequnlock(&xtime_lock); - - return IRQ_HANDLED; -} - -#ifdef CONFIG_SMP -void timer_tick_interrupt(struct pt_regs *regs) -{ - write_seqlock(&xtime_lock); - - do_timer(regs); - - timer_check_rtc(); - - write_sequnlock(&xtime_lock); -} -#endif - -/* 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; -#else - unsigned long dregs = 0UL; -#endif - u8 tmp; - - if (!mregs && !dregs) { - 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 { - int i; - - /* Dallas 12887 RTC chip. */ - - /* Stolen from arch/i386/kernel/time.c, see there for - * credits and descriptive comments. - */ - for (i = 0; i < 1000000; i++) { - if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP) - break; - udelay(10); - } - for (i = 0; i < 1000000; i++) { - if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)) - break; - udelay(10); - } - 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); - } -} - -void __init clock_probe(void) -{ - struct linux_prom_registers clk_reg[2]; - char model[128]; - int node, busnd = -1, err; - unsigned long flags; - struct linux_central *cbus; -#ifdef CONFIG_PCI - struct linux_ebus *ebus = NULL; - struct sparc_isa_bridge *isa_br = NULL; -#endif - static int invoked; - - if (invoked) - return; - invoked = 1; - - - if (this_is_starfire) { - /* davem suggests we keep this within the 4M locked kernel image */ - static char obp_gettod[256]; - static u32 unix_tod; - - sprintf(obp_gettod, "h# %08x unix-gettod", - (unsigned int) (long) &unix_tod); - prom_feval(obp_gettod); - xtime.tv_sec = unix_tod; - xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ); - set_normalized_timespec(&wall_to_monotonic, - -xtime.tv_sec, -xtime.tv_nsec); - return; - } - - local_irq_save(flags); - - cbus = central_bus; - if (cbus != NULL) - busnd = central_bus->child->prom_node; - - /* Check FHC Central then EBUSs then ISA bridges then SBUSs. - * That way we handle the presence of multiple properly. - * - * As a special case, machines with Central must provide the - * timer chip there. - */ -#ifdef CONFIG_PCI - if (ebus_chain != NULL) { - ebus = ebus_chain; - if (busnd == -1) - busnd = ebus->prom_node; - } - if (isa_chain != NULL) { - isa_br = isa_chain; - if (busnd == -1) - busnd = isa_br->prom_node; - } -#endif - if (sbus_root != NULL && busnd == -1) - busnd = sbus_root->prom_node; - - if (busnd == -1) { - prom_printf("clock_probe: problem, cannot find bus to search.\n"); - prom_halt(); - } - - node = prom_getchild(busnd); - - while (1) { - if (!node) - model[0] = 0; - else - prom_getstring(node, "model", model, sizeof(model)); - if (strcmp(model, "mk48t02") && - strcmp(model, "mk48t08") && - strcmp(model, "mk48t59") && - strcmp(model, "m5819") && - strcmp(model, "m5819p") && - strcmp(model, "m5823") && - strcmp(model, "ds1287")) { - if (cbus != NULL) { - prom_printf("clock_probe: Central bus lacks timer chip.\n"); - prom_halt(); - } - - if (node != 0) - node = prom_getsibling(node); -#ifdef CONFIG_PCI - while ((node == 0) && ebus != NULL) { - ebus = ebus->next; - if (ebus != NULL) { - busnd = ebus->prom_node; - node = prom_getchild(busnd); - } - } - while ((node == 0) && isa_br != NULL) { - isa_br = isa_br->next; - if (isa_br != NULL) { - busnd = isa_br->prom_node; - node = prom_getchild(busnd); - } - } -#endif - if (node == 0) { - prom_printf("clock_probe: Cannot find timer chip\n"); - prom_halt(); - } - continue; - } - - err = prom_getproperty(node, "reg", (char *)clk_reg, - sizeof(clk_reg)); - if(err == -1) { - prom_printf("clock_probe: Cannot get Mostek reg property\n"); - prom_halt(); - } - - if (cbus != NULL) { - apply_fhc_ranges(central_bus->child, clk_reg, 1); - apply_central_ranges(central_bus, clk_reg, 1); - } -#ifdef CONFIG_PCI - else if (ebus != NULL) { - struct linux_ebus_device *edev; - - for_each_ebusdev(edev, ebus) - if (edev->prom_node == node) - break; - if (edev == NULL) { - if (isa_chain != NULL) - goto try_isa_clock; - prom_printf("%s: Mostek not probed by EBUS\n", - __FUNCTION__); - prom_halt(); - } - - if (!strcmp(model, "ds1287") || - !strcmp(model, "m5819") || - !strcmp(model, "m5819p") || - !strcmp(model, "m5823")) { - ds1287_regs = edev->resource[0].start; - } else { - mstk48t59_regs = (void __iomem *) - edev->resource[0].start; - mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02; - } - break; - } - else if (isa_br != NULL) { - struct sparc_isa_device *isadev; - -try_isa_clock: - for_each_isadev(isadev, isa_br) - if (isadev->prom_node == node) - break; - if (isadev == NULL) { - prom_printf("%s: Mostek not probed by ISA\n"); - prom_halt(); - } - if (!strcmp(model, "ds1287") || - !strcmp(model, "m5819") || - !strcmp(model, "m5819p") || - !strcmp(model, "m5823")) { - ds1287_regs = isadev->resource.start; - } else { - mstk48t59_regs = (void __iomem *) - isadev->resource.start; - mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02; - } - break; - } -#endif - else { - if (sbus_root->num_sbus_ranges) { - int nranges = sbus_root->num_sbus_ranges; - int rngc; - - for (rngc = 0; rngc < nranges; rngc++) - if (clk_reg[0].which_io == - sbus_root->sbus_ranges[rngc].ot_child_space) - break; - if (rngc == nranges) { - prom_printf("clock_probe: Cannot find ranges for " - "clock regs.\n"); - prom_halt(); - } - clk_reg[0].which_io = - sbus_root->sbus_ranges[rngc].ot_parent_space; - clk_reg[0].phys_addr += - sbus_root->sbus_ranges[rngc].ot_parent_base; - } - } - - if(model[5] == '0' && model[6] == '2') { - mstk48t02_regs = (void __iomem *) - (((u64)clk_reg[0].phys_addr) | - (((u64)clk_reg[0].which_io)<<32UL)); - } else if(model[5] == '0' && model[6] == '8') { - mstk48t08_regs = (void __iomem *) - (((u64)clk_reg[0].phys_addr) | - (((u64)clk_reg[0].which_io)<<32UL)); - mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02; - } else { - mstk48t59_regs = (void __iomem *) - (((u64)clk_reg[0].phys_addr) | - (((u64)clk_reg[0].which_io)<<32UL)); - mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02; - } - break; - } - - 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); -} - -/* This is gets the master TICK_INT timer going. */ -static unsigned long sparc64_init_timers(void) -{ - unsigned long clock; - int node; -#ifdef CONFIG_SMP - extern void smp_tick_init(void); -#endif - - 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; - node = prom_root_node; - clock = prom_getint(node, "stick-frequency"); - } else { - tick_ops = &tick_operations; - cpu_find_by_instance(0, &node, NULL); - clock = prom_getint(node, "clock-frequency"); - } - } else { - tick_ops = &stick_operations; - node = prom_root_node; - clock = prom_getint(node, "stick-frequency"); - } - timer_tick_offset = clock / HZ; - -#ifdef CONFIG_SMP - smp_tick_init(); -#endif - - return clock; -} - -static void sparc64_start_timers(irqreturn_t (*cfunc)(int, void *, struct pt_regs *)) -{ - unsigned long pstate; - int err; - - /* Register IRQ handler. */ - err = request_irq(build_irq(0, 0, 0UL, 0UL), cfunc, 0, - "timer", NULL); - - if (err) { - prom_printf("Serious problem, cannot register TICK_INT\n"); - prom_halt(); - } - - /* 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(timer_tick_offset); - - /* Restore PSTATE_IE. */ - __asm__ __volatile__("wrpr %0, 0x0, %%pstate" - : /* no outputs */ - : "r" (pstate)); - - local_irq_enable(); -} - -struct freq_table { - unsigned long udelay_val_ref; - unsigned long clock_tick_ref; - unsigned int ref_freq; -}; -static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 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->udelay_val_ref = cpu_data(cpu).udelay_val; - 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).udelay_val = - cpufreq_scale(ft->udelay_val_ref, - ft->ref_freq, - freq->new); - 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 struct time_interpolator sparc64_cpu_interpolator = { - .source = TIME_SOURCE_CPU, - .shift = 16, - .mask = 0xffffffffffffffffLL -}; - -/* The quotient formula is taken from the IA64 port. */ -#define SPARC64_NSEC_PER_CYC_SHIFT 30UL -void __init time_init(void) -{ - unsigned long clock = sparc64_init_timers(); - - sparc64_cpu_interpolator.frequency = clock; - register_time_interpolator(&sparc64_cpu_interpolator); - - /* Now that the interpolator is registered, it is - * safe to start the timer ticking. - */ - sparc64_start_timers(timer_interrupt); - - timer_ticks_per_nsec_quotient = - (((NSEC_PER_SEC << SPARC64_NSEC_PER_CYC_SHIFT) + - (clock / 2)) / clock); - -#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; -#else - unsigned long dregs = 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) - 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 { - 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; - } -} |