diff options
Diffstat (limited to 'arch/sparc64/kernel/time.c')
| -rw-r--r-- | arch/sparc64/kernel/time.c | 1731 |
1 files changed, 0 insertions, 1731 deletions
diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c deleted file mode 100644 index e5d238970c7..00000000000 --- a/arch/sparc64/kernel/time.c +++ /dev/null @@ -1,1731 +0,0 @@ -/* time.c: UltraSparc timer and TOD clock support. - * - * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net) - * 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/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/irq_regs.h> - -#include "entry.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; - -int update_persistent_clock(struct timespec now) -{ - return set_rtc_mmss(now.tv_sec); -} - -/* 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? */ -} - -static void __init mostek_set_system_time(void __iomem *mregs) -{ - unsigned int year, mon, day, hour, min, sec; - u8 tmp; - - 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) ); - - 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); - - tmp = mostek_read(mregs + MOSTEK_CREG); - tmp &= ~MSTK_CREG_READ; - mostek_write(mregs + MOSTEK_CREG, tmp); - - spin_unlock_irq(&mostek_lock); -} - -/* 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 - - if (!mregs && !dregs && !bregs) { - prom_printf("Something wrong, clock regs not mapped yet.\n"); - prom_halt(); - } - - if (mregs) { - mostek_set_system_time(mregs); - return; - } - - 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); -} - -/* 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 = { - .match_table = clock_match, - .probe = clock_probe, - .driver = { - .name = "clock", - }, -}; - -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_platform_bus_type); -} - -/* Must be after subsys_initcall() so that busses are probed. Must - * be before device_initcall() because things like the RTC driver - * need to see the clock registers. - */ -fs_initcall(clock_init); - -/* This is gets the master TICK_INT timer going. */ -static unsigned long sparc64_init_timers(void) -{ - struct device_node *dp; - unsigned long clock; - - 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); - } - - 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: - case CLOCK_EVT_MODE_RESUME: - 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; -} - -static unsigned long tb_ticks_per_usec __read_mostly; - -void __delay(unsigned long loops) -{ - unsigned long bclock, now; - - bclock = tick_ops->get_tick(); - do { - now = tick_ops->get_tick(); - } while ((now-bclock) < loops); -} -EXPORT_SYMBOL(__delay); - -void udelay(unsigned long usecs) -{ - __delay(tb_ticks_per_usec * usecs); -} -EXPORT_SYMBOL(udelay); - -void __init time_init(void) -{ - unsigned long clock = sparc64_init_timers(); - - tb_ticks_per_usec = clock / USEC_PER_SEC; - - 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(0x7fffffffffffffffUL, &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; -} - -static void cmos_get_rtc_time(struct rtc_time *rtc_tm) -{ - unsigned char ctrl; - - rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS); - rtc_tm->tm_min = CMOS_READ(RTC_MINUTES); - rtc_tm->tm_hour = CMOS_READ(RTC_HOURS); - rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH); - rtc_tm->tm_mon = CMOS_READ(RTC_MONTH); - rtc_tm->tm_year = CMOS_READ(RTC_YEAR); - rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK); - - ctrl = CMOS_READ(RTC_CONTROL); - if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { - BCD_TO_BIN(rtc_tm->tm_sec); - BCD_TO_BIN(rtc_tm->tm_min); - BCD_TO_BIN(rtc_tm->tm_hour); - BCD_TO_BIN(rtc_tm->tm_mday); - BCD_TO_BIN(rtc_tm->tm_mon); - BCD_TO_BIN(rtc_tm->tm_year); - BCD_TO_BIN(rtc_tm->tm_wday); - } - - if (rtc_tm->tm_year <= 69) - rtc_tm->tm_year += 100; - - rtc_tm->tm_mon--; -} - -static int cmos_set_rtc_time(struct rtc_time *rtc_tm) -{ - unsigned char mon, day, hrs, min, sec; - unsigned char save_control, save_freq_select; - unsigned int yrs; - - yrs = rtc_tm->tm_year; - mon = rtc_tm->tm_mon + 1; - day = rtc_tm->tm_mday; - hrs = rtc_tm->tm_hour; - min = rtc_tm->tm_min; - sec = rtc_tm->tm_sec; - - if (yrs >= 100) - yrs -= 100; - - if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { - BIN_TO_BCD(sec); - BIN_TO_BCD(min); - BIN_TO_BCD(hrs); - BIN_TO_BCD(day); - BIN_TO_BCD(mon); - BIN_TO_BCD(yrs); - } - - save_control = CMOS_READ(RTC_CONTROL); - CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); - save_freq_select = CMOS_READ(RTC_FREQ_SELECT); - CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); - - CMOS_WRITE(yrs, RTC_YEAR); - CMOS_WRITE(mon, RTC_MONTH); - CMOS_WRITE(day, RTC_DAY_OF_MONTH); - CMOS_WRITE(hrs, RTC_HOURS); - CMOS_WRITE(min, RTC_MINUTES); - CMOS_WRITE(sec, RTC_SECONDS); - - CMOS_WRITE(save_control, RTC_CONTROL); - CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); - - return 0; -} -#endif /* CONFIG_PCI */ - -static void mostek_get_rtc_time(struct rtc_time *rtc_tm) -{ - void __iomem *regs = mstk48t02_regs; - u8 tmp; - - spin_lock_irq(&mostek_lock); - - tmp = mostek_read(regs + MOSTEK_CREG); - tmp |= MSTK_CREG_READ; - mostek_write(regs + MOSTEK_CREG, tmp); - - rtc_tm->tm_sec = MSTK_REG_SEC(regs); - rtc_tm->tm_min = MSTK_REG_MIN(regs); - rtc_tm->tm_hour = MSTK_REG_HOUR(regs); - rtc_tm->tm_mday = MSTK_REG_DOM(regs); - rtc_tm->tm_mon = MSTK_REG_MONTH(regs); - rtc_tm->tm_year = MSTK_CVT_YEAR( MSTK_REG_YEAR(regs) ); - rtc_tm->tm_wday = MSTK_REG_DOW(regs); - - tmp = mostek_read(regs + MOSTEK_CREG); - tmp &= ~MSTK_CREG_READ; - mostek_write(regs + MOSTEK_CREG, tmp); - - spin_unlock_irq(&mostek_lock); - - rtc_tm->tm_mon--; - rtc_tm->tm_wday--; - rtc_tm->tm_year -= 1900; -} - -static int mostek_set_rtc_time(struct rtc_time *rtc_tm) -{ - unsigned char mon, day, hrs, min, sec, wday; - void __iomem *regs = mstk48t02_regs; - unsigned int yrs; - u8 tmp; - - yrs = rtc_tm->tm_year + 1900; - mon = rtc_tm->tm_mon + 1; - day = rtc_tm->tm_mday; - wday = rtc_tm->tm_wday + 1; - hrs = rtc_tm->tm_hour; - min = rtc_tm->tm_min; - sec = rtc_tm->tm_sec; - - spin_lock_irq(&mostek_lock); - - tmp = mostek_read(regs + MOSTEK_CREG); - tmp |= MSTK_CREG_WRITE; - mostek_write(regs + MOSTEK_CREG, tmp); - - MSTK_SET_REG_SEC(regs, sec); - MSTK_SET_REG_MIN(regs, min); - MSTK_SET_REG_HOUR(regs, hrs); - MSTK_SET_REG_DOW(regs, wday); - MSTK_SET_REG_DOM(regs, day); - MSTK_SET_REG_MONTH(regs, mon); - MSTK_SET_REG_YEAR(regs, yrs - MSTK_YEAR_ZERO); - - tmp = mostek_read(regs + MOSTEK_CREG); - tmp &= ~MSTK_CREG_WRITE; - mostek_write(regs + MOSTEK_CREG, tmp); - - spin_unlock_irq(&mostek_lock); - - return 0; -} - -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, -}; - -static struct mini_rtc_ops cmos_rtc_ops = { - .get_rtc_time = cmos_get_rtc_time, - .set_rtc_time = cmos_set_rtc_time, -}; -#endif /* CONFIG_PCI */ - -static struct mini_rtc_ops mostek_rtc_ops = { - .get_rtc_time = mostek_get_rtc_time, - .set_rtc_time = mostek_set_rtc_time, -}; - -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; - else if (ds1287_regs) - mini_rtc_ops = &cmos_rtc_ops; -#endif /* CONFIG_PCI */ - else if (mstk48t02_regs) - mini_rtc_ops = &mostek_rtc_ops; - 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); -} - -int __devinit read_current_timer(unsigned long *timer_val) -{ - *timer_val = tick_ops->get_tick(); - return 0; -} - -module_init(rtc_mini_init); -module_exit(rtc_mini_exit); |