X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fsparc64%2Fkernel%2Ftime.c;h=061e1b1fa5838e24701f9b307527c2d9c7325ca4;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=f961a0d3b1290a412be5de381bb1508172e1c906;hpb=9bf4aaab3e101692164d49b7ca357651eb691cb6;p=linux-2.6.git diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c index f961a0d3b..061e1b1fa 100644 --- a/arch/sparc64/kernel/time.c +++ b/arch/sparc64/kernel/time.c @@ -9,7 +9,6 @@ * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu) */ -#include #include #include #include @@ -29,44 +28,51 @@ #include #include #include +#include +#include +#include #include #include #include #include #include -#include -#include -#include -#include -#include +#include +#include #include #include #include #include +#include +#include +#include -spinlock_t mostek_lock = SPIN_LOCK_UNLOCKED; -spinlock_t rtc_lock = SPIN_LOCK_UNLOCKED; -unsigned long mstk48t02_regs = 0UL; +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; - -u64 jiffies_64 = INITIAL_JIFFIES; - -EXPORT_SYMBOL(jiffies_64); - -static unsigned long mstk48t08_regs = 0UL; -static unsigned long mstk48t59_regs = 0UL; +static void __iomem *mstk48t08_regs; +static void __iomem *mstk48t59_regs; static int set_rtc_mmss(unsigned long); -struct sparc64_tick_ops *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 @@ -173,7 +179,7 @@ static unsigned long tick_add_tick(unsigned long adj, unsigned long offset) return new_tick; } -static struct sparc64_tick_ops tick_operations = { +static struct sparc64_tick_ops tick_operations __read_mostly = { .init_tick = tick_init_tick, .get_tick = tick_get_tick, .get_compare = tick_get_compare, @@ -182,18 +188,26 @@ static struct sparc64_tick_ops tick_operations = { .softint_mask = 1UL << 0, }; +struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations; + 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"); + /* 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(); + + /* 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" @@ -254,7 +268,7 @@ static unsigned long stick_add_compare(unsigned long adj) return new_compare; } -static struct sparc64_tick_ops stick_operations = { +static struct sparc64_tick_ops stick_operations __read_mostly = { .init_tick = stick_init_tick, .get_tick = stick_get_tick, .get_compare = stick_get_compare, @@ -271,9 +285,9 @@ static struct sparc64_tick_ops stick_operations = { * 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 + * 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 @@ -286,18 +300,18 @@ static struct sparc64_tick_ops stick_operations = { static unsigned long __hbird_read_stick(void) { unsigned long ret, tmp1, tmp2, tmp3; - unsigned long addr = HBIRD_STICK_ADDR; + unsigned long addr = HBIRD_STICK_ADDR+8; - __asm__ __volatile__("ldxa [%1] %5, %2\n\t" - "add %1, 0x8, %1\n\t" - "ldxa [%1] %5, %3\n\t" + __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" - "blu,a,pn %%xcc, 1f\n\t" - " add %3, 1, %3\n" - "1:\n\t" - "sllx %3, 32, %3\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) @@ -400,7 +414,7 @@ static unsigned long hbtick_add_compare(unsigned long adj) return val; } -static struct sparc64_tick_ops hbtick_operations = { +static struct sparc64_tick_ops hbtick_operations __read_mostly = { .init_tick = hbtick_init_tick, .get_tick = hbtick_get_tick, .get_compare = hbtick_get_compare, @@ -415,11 +429,9 @@ static struct sparc64_tick_ops hbtick_operations = { * 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; -unsigned long timer_tick_compare; +unsigned long timer_tick_offset __read_mostly; -static unsigned long timer_ticks_per_usec_quotient; -static unsigned long timer_ticks_per_nsec_quotient; +static unsigned long timer_ticks_per_nsec_quotient __read_mostly; #define TICK_SIZE (tick_nsec / 1000) @@ -429,7 +441,7 @@ static inline void timer_check_rtc(void) static long last_rtc_update; /* Determine when to update the Mostek clock. */ - if ((time_status & STA_UNSYNC) == 0 && + 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) { @@ -441,39 +453,18 @@ static inline void timer_check_rtc(void) } } -void sparc64_do_profile(struct pt_regs *regs) -{ - unsigned long pc; - - profile_hook(regs); - - if (user_mode(regs)) - return; - - if (!prof_buffer) - return; - - pc = regs->tpc; - - pc -= (unsigned long) _stext; - pc >>= prof_shift; - - if(pc >= prof_len) - pc = prof_len - 1; - atomic_inc((atomic_t *)&prof_buffer[pc]); -} - -static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs) +irqreturn_t timer_interrupt(int irq, void *dev_id) { - unsigned long ticks, pstate; + unsigned long ticks, compare, pstate; write_seqlock(&xtime_lock); do { #ifndef CONFIG_SMP - sparc64_do_profile(regs); + profile_tick(CPU_PROFILING); + update_process_times(user_mode(get_irq_regs())); #endif - do_timer(regs); + do_timer(1); /* Guarantee that the following sequences execute * uninterrupted. @@ -483,14 +474,14 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs) : "=r" (pstate) : "i" (PSTATE_IE)); - timer_tick_compare = tick_ops->add_compare(timer_tick_offset); + 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, timer_tick_compare)); + } while (time_after_eq(ticks, compare)); timer_check_rtc(); @@ -504,12 +495,7 @@ void timer_tick_interrupt(struct pt_regs *regs) { write_seqlock(&xtime_lock); - do_timer(regs); - - /* - * Only keep timer_tick_offset uptodate, but don't set TICK_CMPR. - */ - timer_tick_compare = tick_ops->get_compare() + timer_tick_offset; + do_timer(1); timer_check_rtc(); @@ -520,7 +506,7 @@ void timer_tick_interrupt(struct pt_regs *regs) /* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */ static void __init kick_start_clock(void) { - unsigned long regs = mstk48t02_regs; + void __iomem *regs = mstk48t02_regs; u8 sec, tmp; int i, count; @@ -604,7 +590,7 @@ static void __init kick_start_clock(void) /* Return nonzero if the clock chip battery is low. */ static int __init has_low_battery(void) { - unsigned long regs = mstk48t02_regs; + void __iomem *regs = mstk48t02_regs; u8 data1, data2; spin_lock_irq(&mostek_lock); @@ -623,7 +609,7 @@ static int __init has_low_battery(void) static void __init set_system_time(void) { unsigned int year, mon, day, hour, min, sec; - unsigned long mregs = mstk48t02_regs; + void __iomem *mregs = mstk48t02_regs; #ifdef CONFIG_PCI unsigned long dregs = ds1287_regs; #else @@ -651,23 +637,8 @@ static void __init set_system_time(void) 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); @@ -676,6 +647,7 @@ static void __init set_system_time(void) 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); @@ -702,209 +674,142 @@ static void __init set_system_time(void) } } -void __init clock_probe(void) +/* davem suggests we keep this within the 4M locked kernel image */ +static u32 starfire_get_time(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; - } + static char obp_gettod[32]; + static u32 unix_tod; - local_irq_save(flags); + sprintf(obp_gettod, "h# %08x unix-gettod", + (unsigned int) (long) &unix_tod); + prom_feval(obp_gettod); - cbus = central_bus; - if (cbus != NULL) - busnd = central_bus->child->prom_node; + return unix_tod; +} - /* 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. +static int starfire_set_time(u32 val) +{ + /* Do nothing, time is set using the service processor + * console on this platform. */ -#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; + return 0; +} + +static u32 hypervisor_get_time(void) +{ + register unsigned long func asm("%o5"); + register unsigned long arg0 asm("%o0"); + register unsigned long arg1 asm("%o1"); + int retries = 10000; + +retry: + func = HV_FAST_TOD_GET; + arg0 = 0; + arg1 = 0; + __asm__ __volatile__("ta %6" + : "=&r" (func), "=&r" (arg0), "=&r" (arg1) + : "0" (func), "1" (arg0), "2" (arg1), + "i" (HV_FAST_TRAP)); + if (arg0 == HV_EOK) + return arg1; + if (arg0 == HV_EWOULDBLOCK) { + if (--retries > 0) { + udelay(100); + goto retry; + } + printk(KERN_WARNING "SUN4V: tod_get() timed out.\n"); + return 0; } -#endif - if (sbus_root != NULL && busnd == -1) - busnd = sbus_root->prom_node; + printk(KERN_WARNING "SUN4V: tod_get() not supported.\n"); + return 0; +} - if (busnd == -1) { - prom_printf("clock_probe: problem, cannot find bus to search.\n"); - prom_halt(); +static int hypervisor_set_time(u32 secs) +{ + register unsigned long func asm("%o5"); + register unsigned long arg0 asm("%o0"); + int retries = 10000; + +retry: + func = HV_FAST_TOD_SET; + arg0 = secs; + __asm__ __volatile__("ta %4" + : "=&r" (func), "=&r" (arg0) + : "0" (func), "1" (arg0), + "i" (HV_FAST_TRAP)); + if (arg0 == HV_EOK) + return 0; + if (arg0 == 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; +} - node = prom_getchild(busnd); +static int __init clock_model_matches(char *model) +{ + if (strcmp(model, "mk48t02") && + strcmp(model, "mk48t08") && + strcmp(model, "mk48t59") && + strcmp(model, "m5819") && + strcmp(model, "m5819p") && + strcmp(model, "m5823") && + strcmp(model, "ds1287")) + return 0; - 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, "ds1287")) { - if (cbus != NULL) { - prom_printf("clock_probe: Central bus lacks timer chip.\n"); - prom_halt(); - } + return 1; +} - 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; - } +static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match) +{ + struct device_node *dp = op->node; + char *model = of_get_property(dp, "model", NULL); + unsigned long size, flags; + void __iomem *regs; - 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 (!model || !clock_model_matches(model)) + return -ENODEV; - 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(); - } + /* 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; - if (!strcmp(model, "ds1287") || - !strcmp(model, "m5819") || - !strcmp(model, "m5819p")) { - ds1287_regs = edev->resource[0].start; - } else { - mstk48t59_regs = 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")) { - ds1287_regs = isadev->resource.start; - } else { - mstk48t59_regs = 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; - } - } + size = (op->resource[0].end - op->resource[0].start) + 1; + regs = of_ioremap(&op->resource[0], 0, size, "clock"); + if (!regs) + return -ENOMEM; - if(model[5] == '0' && model[6] == '2') { - mstk48t02_regs = (((u64)clk_reg[0].phys_addr) | - (((u64)clk_reg[0].which_io)<<32UL)); - } else if(model[5] == '0' && model[6] == '8') { - mstk48t08_regs = (((u64)clk_reg[0].phys_addr) | - (((u64)clk_reg[0].which_io)<<32UL)); - mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02; - } else { - mstk48t59_regs = (((u64)clk_reg[0].phys_addr) | - (((u64)clk_reg[0].which_io)<<32UL)); - mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02; - } - break; +#ifdef CONFIG_PCI + if (!strcmp(model, "ds1287") || + !strcmp(model, "m5819") || + !strcmp(model, "m5819p") || + !strcmp(model, "m5823")) { + ds1287_regs = (unsigned long) 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; } - if (mstk48t02_regs != 0UL) { + 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"); @@ -917,17 +822,63 @@ try_isa_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(irqreturn_t (*cfunc)(int, void *, struct pt_regs *)) +static unsigned long sparc64_init_timers(void) { - unsigned long pstate, clock; - int node, err; + struct device_node *dp; + struct property *prop; + 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; @@ -938,32 +889,29 @@ static unsigned long sparc64_init_timers(irqreturn_t (*cfunc)(int, void *, struc if (manuf == 0x17 && impl == 0x13) { /* Hummingbird, aka Ultra-IIe */ tick_ops = &hbtick_operations; - node = prom_root_node; - clock = prom_getint(node, "stick-frequency"); + prop = of_find_property(dp, "stick-frequency", NULL); } else { tick_ops = &tick_operations; - cpu_find_by_instance(0, &node, NULL); - clock = prom_getint(node, "clock-frequency"); + cpu_find_by_instance(0, &dp, NULL); + prop = of_find_property(dp, "clock-frequency", NULL); } } else { tick_ops = &stick_operations; - node = prom_root_node; - clock = prom_getint(node, "stick-frequency"); + prop = of_find_property(dp, "stick-frequency", NULL); } + clock = *(unsigned int *) prop->value; timer_tick_offset = clock / HZ; #ifdef CONFIG_SMP smp_tick_init(); #endif - /* Register IRQ handler. */ - err = request_irq(build_irq(0, 0, 0UL, 0UL), cfunc, SA_STATIC_ALLOC, - "timer", NULL); + return clock; +} - if (err) { - prom_printf("Serious problem, cannot register TICK_INT\n"); - prom_halt(); - } +static void sparc64_start_timers(void) +{ + unsigned long pstate; /* Guarantee that the following sequences execute * uninterrupted. @@ -979,18 +927,13 @@ static unsigned long sparc64_init_timers(irqreturn_t (*cfunc)(int, void *, struc __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : /* no outputs */ : "r" (pstate)); - - local_irq_enable(); - - return clock; } 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 }; +static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 }; unsigned long sparc64_get_clock_tick(unsigned int cpu) { @@ -1012,16 +955,11 @@ static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val 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, @@ -1034,18 +972,28 @@ static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val static struct notifier_block sparc64_cpufreq_notifier_block = { .notifier_call = sparc64_cpufreq_notifier }; -#endif + +#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_USEC_PER_CYC_SHIFT 30UL -#define SPARC64_NSEC_PER_CYC_SHIFT 30UL +#define SPARC64_NSEC_PER_CYC_SHIFT 10UL void __init time_init(void) { - unsigned long clock = sparc64_init_timers(timer_interrupt); + unsigned long clock = sparc64_init_timers(); - timer_ticks_per_usec_quotient = - (((1000000UL << SPARC64_USEC_PER_CYC_SHIFT) + - (clock / 2)) / clock); + 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_ticks_per_nsec_quotient = (((NSEC_PER_SEC << SPARC64_NSEC_PER_CYC_SHIFT) + @@ -1057,17 +1005,6 @@ void __init time_init(void) #endif } -static __inline__ unsigned long do_gettimeoffset(void) -{ - unsigned long ticks = tick_ops->get_tick(); - - ticks += timer_tick_offset; - ticks -= timer_tick_compare; - - return (ticks * timer_ticks_per_usec_quotient) - >> SPARC64_USEC_PER_CYC_SHIFT; -} - unsigned long long sched_clock(void) { unsigned long ticks = tick_ops->get_tick(); @@ -1076,104 +1013,10 @@ unsigned long long sched_clock(void) >> SPARC64_NSEC_PER_CYC_SHIFT; } -int 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; - - if (this_is_starfire) - return 0; - - write_seqlock_irq(&xtime_lock); - /* - * 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 -= do_gettimeoffset() * 1000; - nsec -= (jiffies - wall_jiffies) * (NSEC_PER_SEC / HZ); - - 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); - - time_adjust = 0; /* stop active adjtime() */ - time_status |= STA_UNSYNC; - time_maxerror = NTP_PHASE_LIMIT; - time_esterror = NTP_PHASE_LIMIT; - write_sequnlock_irq(&xtime_lock); - clock_was_set(); - return 0; -} - -EXPORT_SYMBOL(do_settimeofday); - -/* 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, wall_jiffies, et al.) - */ -void do_gettimeofday(struct timeval *tv) -{ - unsigned long seq; - unsigned long usec, sec; - unsigned long max_ntp_tick = tick_usec - tickadj; - - do { - unsigned long lost; - - seq = read_seqbegin(&xtime_lock); - usec = do_gettimeoffset(); - lost = jiffies - wall_jiffies; - - /* - * 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); - - if (lost) - usec += lost * max_ntp_tick; - } - else if (unlikely(lost)) - usec += lost * tick_usec; - - sec = xtime.tv_sec; - - /* Believe it or not, this divide shows up on - * kernel profiles. The problem is that it is - * both 64-bit and signed. Happily, 32-bits - * of precision is all we really need and in - * doing so gcc ends up emitting a cheap multiply. - * - * XXX Why is tv_nsec 'long' and 'signed' in - * XXX the first place, can it even be negative? - */ - usec += ((unsigned int) xtime.tv_nsec / 1000U); - } while (read_seqretry(&xtime_lock, seq)); - - while (usec >= 1000000) { - usec -= 1000000; - sec++; - } - - tv->tv_sec = sec; - tv->tv_usec = usec; -} - -EXPORT_SYMBOL(do_gettimeofday); - static int set_rtc_mmss(unsigned long nowtime) { int real_seconds, real_minutes, chip_minutes; - unsigned long mregs = mstk48t02_regs; + void __iomem *mregs = mstk48t02_regs; #ifdef CONFIG_PCI unsigned long dregs = ds1287_regs; #else @@ -1279,3 +1122,246 @@ static int set_rtc_mmss(unsigned long nowtime) return retval; } } + +#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */ +static unsigned char mini_rtc_status; /* bitmapped status byte. */ + +/* months start at 0 now */ +static unsigned char days_in_mo[] = +{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; + +#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 inline void mini_get_rtc_time(struct rtc_time *time) +{ + unsigned long flags; + u32 seconds; + + spin_lock_irqsave(&rtc_lock, flags); + seconds = 0; + if (this_is_starfire) + seconds = starfire_get_time(); + else if (tlb_type == hypervisor) + seconds = hypervisor_get_time(); + spin_unlock_irqrestore(&rtc_lock, flags); + + to_tm(seconds, time); + time->tm_year -= 1900; + time->tm_mon -= 1; +} + +static inline int mini_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); + unsigned long flags; + int err; + + spin_lock_irqsave(&rtc_lock, flags); + err = -ENODEV; + if (this_is_starfire) + err = starfire_set_time(seconds); + else if (tlb_type == hypervisor) + err = hypervisor_set_time(seconds); + 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; + unsigned char leap_yr; + + if (!capable(CAP_SYS_TIME)) + return -EACCES; + + if (copy_from_user(&wtime, argp, sizeof(wtime))) + return -EFAULT; + + year = wtime.tm_year + 1900; + leap_yr = ((!(year % 4) && (year % 100)) || + !(year % 400)); + + if ((wtime.tm_mon < 0 || wtime.tm_mon > 11) || (wtime.tm_mday < 1)) + return -EINVAL; + + if (wtime.tm_mday < 0 || wtime.tm_mday > + (days_in_mo[wtime.tm_mon] + ((wtime.tm_mon == 1) && leap_yr))) + 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 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 && !this_is_starfire) + 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);