static int cmos_irq_set_freq(struct device *dev, int freq) { struct cmos_rtc *cmos = dev_get_drvdata(dev); int f; unsigned long flags; if (!is_valid_irq(cmos->irq)) return -ENXIO; /* 0 = no irqs; 1 = 2^15 Hz ... 15 = 2^0 Hz */ f = ffs(freq); if (f-- > 16) return -EINVAL; f = 16 - f; spin_lock_irqsave(&rtc_lock, flags); hpet_set_periodic_freq(freq); CMOS_WRITE(RTC_REF_CLCK_32KHZ | f, RTC_FREQ_SELECT); spin_unlock_irqrestore(&rtc_lock, flags); return 0; }
static int INITSECTION cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq) { struct cmos_rtc_board_info *info = dev->platform_data; int retval = 0; unsigned char rtc_control; unsigned address_space; /* there can be only one ... */ if (cmos_rtc.dev) return -EBUSY; if (!ports) return -ENODEV; /* Claim I/O ports ASAP, minimizing conflict with legacy driver. * * REVISIT non-x86 systems may instead use memory space resources * (needing ioremap etc), not i/o space resources like this ... */ ports = request_region(ports->start, resource_size(ports), driver_name); if (!ports) { dev_dbg(dev, "i/o registers already in use\n"); return -EBUSY; } cmos_rtc.irq = rtc_irq; cmos_rtc.iomem = ports; /* Heuristic to deduce NVRAM size ... do what the legacy NVRAM * driver did, but don't reject unknown configs. Old hardware * won't address 128 bytes. Newer chips have multiple banks, * though they may not be listed in one I/O resource. */ #if defined(CONFIG_ATARI) address_space = 64; #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) \ || defined(__sparc__) || defined(__mips__) \ || defined(__powerpc__) address_space = 128; #else #warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes. address_space = 128; #endif if (can_bank2 && ports->end > (ports->start + 1)) address_space = 256; /* For ACPI systems extension info comes from the FADT. On others, * board specific setup provides it as appropriate. Systems where * the alarm IRQ isn't automatically a wakeup IRQ (like ACPI, and * some almost-clones) can provide hooks to make that behave. * * Note that ACPI doesn't preclude putting these registers into * "extended" areas of the chip, including some that we won't yet * expect CMOS_READ and friends to handle. */ if (info) { if (info->rtc_day_alarm && info->rtc_day_alarm < 128) cmos_rtc.day_alrm = info->rtc_day_alarm; if (info->rtc_mon_alarm && info->rtc_mon_alarm < 128) cmos_rtc.mon_alrm = info->rtc_mon_alarm; if (info->rtc_century && info->rtc_century < 128) cmos_rtc.century = info->rtc_century; if (info->wake_on && info->wake_off) { cmos_rtc.wake_on = info->wake_on; cmos_rtc.wake_off = info->wake_off; } } cmos_rtc.dev = dev; dev_set_drvdata(dev, &cmos_rtc); cmos_rtc.rtc = rtc_device_register(driver_name, dev, &cmos_rtc_ops, THIS_MODULE); if (IS_ERR(cmos_rtc.rtc)) { retval = PTR_ERR(cmos_rtc.rtc); goto cleanup0; } rename_region(ports, dev_name(&cmos_rtc.rtc->dev)); spin_lock_irq(&rtc_lock); /* force periodic irq to CMOS reset default of 1024Hz; * * REVISIT it's been reported that at least one x86_64 ALI mobo * doesn't use 32KHz here ... for portability we might need to * do something about other clock frequencies. */ cmos_rtc.rtc->irq_freq = 1024; hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq); CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT); /* disable irqs */ cmos_irq_disable(&cmos_rtc, RTC_PIE | RTC_AIE | RTC_UIE); rtc_control = CMOS_READ(RTC_CONTROL); spin_unlock_irq(&rtc_lock); /* FIXME: * <asm-generic/rtc.h> doesn't know 12-hour mode either. */ if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) { dev_warn(dev, "only 24-hr supported\n"); retval = -ENXIO; goto cleanup1; } if (is_valid_irq(rtc_irq)) { irq_handler_t rtc_cmos_int_handler; if (is_hpet_enabled()) { int err; rtc_cmos_int_handler = hpet_rtc_interrupt; err = hpet_register_irq_handler(cmos_interrupt); if (err != 0) { dev_warn(dev, "hpet_register_irq_handler " " failed in rtc_init()."); goto cleanup1; } } else rtc_cmos_int_handler = cmos_interrupt; retval = request_irq(rtc_irq, rtc_cmos_int_handler, 0, dev_name(&cmos_rtc.rtc->dev), cmos_rtc.rtc); if (retval < 0) { dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq); goto cleanup1; } } hpet_rtc_timer_init(); /* export at least the first block of NVRAM */ nvram.size = address_space - NVRAM_OFFSET; retval = sysfs_create_bin_file(&dev->kobj, &nvram); if (retval < 0) { dev_dbg(dev, "can't create nvram file? %d\n", retval); goto cleanup2; } dev_info(dev, "%s%s, %zd bytes nvram%s\n", !is_valid_irq(rtc_irq) ? "no alarms" : cmos_rtc.mon_alrm ? "alarms up to one year" : cmos_rtc.day_alrm ? "alarms up to one month" : "alarms up to one day", cmos_rtc.century ? ", y3k" : "", nvram.size, is_hpet_enabled() ? ", hpet irqs" : ""); return 0; cleanup2: if (is_valid_irq(rtc_irq)) free_irq(rtc_irq, cmos_rtc.rtc); cleanup1: cmos_rtc.dev = NULL; rtc_device_unregister(cmos_rtc.rtc); cleanup0: release_region(ports->start, resource_size(ports)); return retval; }
static int __init rtc_init(void) { struct proc_dir_entry *ent; #if defined(__alpha__) || defined(__mips__) unsigned int year, ctrl; char *guess = NULL; #endif #ifdef __sparc__ struct linux_ebus *ebus; struct linux_ebus_device *edev; #ifdef __sparc_v9__ struct sparc_isa_bridge *isa_br; struct sparc_isa_device *isa_dev; #endif #endif #ifdef __sparc__ for_each_ebus(ebus) { for_each_ebusdev(edev, ebus) { if(strcmp(edev->prom_name, "rtc") == 0) { rtc_port = edev->resource[0].start; rtc_irq = edev->irqs[0]; goto found; } } } #ifdef __sparc_v9__ for_each_isa(isa_br) { for_each_isadev(isa_dev, isa_br) { if (strcmp(isa_dev->prom_name, "rtc") == 0) { rtc_port = isa_dev->resource.start; rtc_irq = isa_dev->irq; goto found; } } } #endif printk(KERN_ERR "rtc_init: no PC rtc found\n"); return -EIO; found: if (rtc_irq == PCI_IRQ_NONE) { rtc_has_irq = 0; goto no_irq; } /* * XXX Interrupt pin #7 in Espresso is shared between RTC and * PCI Slot 2 INTA# (and some INTx# in Slot 1). */ if (request_irq(rtc_irq, rtc_interrupt, SA_SHIRQ, "rtc", (void *)&rtc_port)) { /* * Standard way for sparc to print irq's is to use * __irq_itoa(). I think for EBus it's ok to use %d. */ printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq); return -EIO; } no_irq: #else if (!request_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc")) { printk(KERN_ERR "rtc: I/O port %d is not free.\n", RTC_PORT (0)); return -EIO; } #ifdef RTC_IRQ if (is_hpet_enabled()) { rtc_int_handler_ptr = hpet_rtc_interrupt; } else { rtc_int_handler_ptr = rtc_interrupt; } if(request_irq(RTC_IRQ, rtc_int_handler_ptr, SA_INTERRUPT, "rtc", NULL)) { /* Yeah right, seeing as irq 8 doesn't even hit the bus. */ printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ); release_region(RTC_PORT(0), RTC_IO_EXTENT); return -EIO; } hpet_rtc_timer_init(); #endif #endif /* __sparc__ vs. others */ if (misc_register(&rtc_dev)) { #ifdef RTC_IRQ free_irq(RTC_IRQ, NULL); #endif release_region(RTC_PORT(0), RTC_IO_EXTENT); return -ENODEV; } ent = create_proc_entry("driver/rtc", 0, NULL); if (!ent) { #ifdef RTC_IRQ free_irq(RTC_IRQ, NULL); #endif release_region(RTC_PORT(0), RTC_IO_EXTENT); misc_deregister(&rtc_dev); return -ENOMEM; } ent->proc_fops = &rtc_proc_fops; #if defined(__alpha__) || defined(__mips__) rtc_freq = HZ; /* Each operating system on an Alpha uses its own epoch. Let's try to guess which one we are using now. */ if (rtc_is_updating() != 0) msleep(20); spin_lock_irq(&rtc_lock); year = CMOS_READ(RTC_YEAR); ctrl = CMOS_READ(RTC_CONTROL); spin_unlock_irq(&rtc_lock); if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) BCD_TO_BIN(year); /* This should never happen... */ if (year < 20) { epoch = 2000; guess = "SRM (post-2000)"; } else if (year >= 20 && year < 48) { epoch = 1980; guess = "ARC console"; } else if (year >= 48 && year < 72) { epoch = 1952; guess = "Digital UNIX"; #if defined(__mips__) } else if (year >= 72 && year < 74) { epoch = 2000; guess = "Digital DECstation"; #else } else if (year >= 70) { epoch = 1900; guess = "Standard PC (1900)"; #endif } if (guess) printk(KERN_INFO "rtc: %s epoch (%lu) detected\n", guess, epoch); #endif #ifdef RTC_IRQ if (rtc_has_irq == 0) goto no_irq2; init_timer(&rtc_irq_timer); rtc_irq_timer.function = rtc_dropped_irq; spin_lock_irq(&rtc_lock); rtc_freq = 1024; if (!hpet_set_periodic_freq(rtc_freq)) { /* Initialize periodic freq. to CMOS reset default, which is 1024Hz */ CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT); } spin_unlock_irq(&rtc_lock); no_irq2: #endif (void) init_sysctl(); printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION "\n"); return 0; }
static int INITSECTION cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq) { struct cmos_rtc_board_info *info = dev->platform_data; int retval = 0; unsigned char rtc_control; unsigned address_space; if (cmos_rtc.dev) return -EBUSY; if (!ports) return -ENODEV; ports = request_region(ports->start, resource_size(ports), driver_name); if (!ports) { dev_dbg(dev, "i/o registers already in use\n"); return -EBUSY; } cmos_rtc.irq = rtc_irq; cmos_rtc.iomem = ports; #if defined(CONFIG_ATARI) address_space = 64; #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) \ || defined(__sparc__) || defined(__mips__) \ || defined(__powerpc__) address_space = 128; #else #warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes. address_space = 128; #endif if (can_bank2 && ports->end > (ports->start + 1)) address_space = 256; if (info) { if (info->rtc_day_alarm && info->rtc_day_alarm < 128) cmos_rtc.day_alrm = info->rtc_day_alarm; if (info->rtc_mon_alarm && info->rtc_mon_alarm < 128) cmos_rtc.mon_alrm = info->rtc_mon_alarm; if (info->rtc_century && info->rtc_century < 128) cmos_rtc.century = info->rtc_century; if (info->wake_on && info->wake_off) { cmos_rtc.wake_on = info->wake_on; cmos_rtc.wake_off = info->wake_off; } } cmos_rtc.dev = dev; dev_set_drvdata(dev, &cmos_rtc); cmos_rtc.rtc = rtc_device_register(driver_name, dev, &cmos_rtc_ops, THIS_MODULE); if (IS_ERR(cmos_rtc.rtc)) { retval = PTR_ERR(cmos_rtc.rtc); goto cleanup0; } rename_region(ports, dev_name(&cmos_rtc.rtc->dev)); spin_lock_irq(&rtc_lock); cmos_rtc.rtc->irq_freq = 1024; hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq); CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT); cmos_irq_disable(&cmos_rtc, RTC_PIE | RTC_AIE | RTC_UIE); rtc_control = CMOS_READ(RTC_CONTROL); spin_unlock_irq(&rtc_lock); if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) { dev_warn(dev, "only 24-hr supported\n"); retval = -ENXIO; goto cleanup1; } if (is_valid_irq(rtc_irq)) { irq_handler_t rtc_cmos_int_handler; if (is_hpet_enabled()) { int err; rtc_cmos_int_handler = hpet_rtc_interrupt; err = hpet_register_irq_handler(cmos_interrupt); if (err != 0) { printk(KERN_WARNING "hpet_register_irq_handler " " failed in rtc_init()."); goto cleanup1; } } else rtc_cmos_int_handler = cmos_interrupt; retval = request_irq(rtc_irq, rtc_cmos_int_handler, 0, dev_name(&cmos_rtc.rtc->dev), cmos_rtc.rtc); if (retval < 0) { dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq); goto cleanup1; } } hpet_rtc_timer_init(); nvram.size = address_space - NVRAM_OFFSET; retval = sysfs_create_bin_file(&dev->kobj, &nvram); if (retval < 0) { dev_dbg(dev, "can't create nvram file? %d\n", retval); goto cleanup2; } pr_info("%s: %s%s, %zd bytes nvram%s\n", dev_name(&cmos_rtc.rtc->dev), !is_valid_irq(rtc_irq) ? "no alarms" : cmos_rtc.mon_alrm ? "alarms up to one year" : cmos_rtc.day_alrm ? "alarms up to one month" : "alarms up to one day", cmos_rtc.century ? ", y3k" : "", nvram.size, is_hpet_enabled() ? ", hpet irqs" : ""); return 0; cleanup2: if (is_valid_irq(rtc_irq)) free_irq(rtc_irq, cmos_rtc.rtc); cleanup1: cmos_rtc.dev = NULL; rtc_device_unregister(cmos_rtc.rtc); cleanup0: release_region(ports->start, resource_size(ports)); return retval; }
static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel) { struct rtc_time wtime; #ifdef RTC_IRQ if (rtc_has_irq == 0) { switch (cmd) { case RTC_AIE_OFF: case RTC_AIE_ON: case RTC_PIE_OFF: case RTC_PIE_ON: case RTC_UIE_OFF: case RTC_UIE_ON: case RTC_IRQP_READ: case RTC_IRQP_SET: return -EINVAL; }; } #endif switch (cmd) { #ifdef RTC_IRQ case RTC_AIE_OFF: /* Mask alarm int. enab. bit */ { mask_rtc_irq_bit(RTC_AIE); return 0; } case RTC_AIE_ON: /* Allow alarm interrupts. */ { set_rtc_irq_bit(RTC_AIE); return 0; } case RTC_PIE_OFF: /* Mask periodic int. enab. bit */ { unsigned long flags; /* can be called from isr via rtc_control() */ spin_lock_irqsave (&rtc_lock, flags); mask_rtc_irq_bit_locked(RTC_PIE); if (rtc_status & RTC_TIMER_ON) { rtc_status &= ~RTC_TIMER_ON; del_timer(&rtc_irq_timer); } spin_unlock_irqrestore (&rtc_lock, flags); return 0; } case RTC_PIE_ON: /* Allow periodic ints */ { unsigned long flags; /* can be called from isr via rtc_control() */ /* * We don't really want Joe User enabling more * than 64Hz of interrupts on a multi-user machine. */ if (!kernel && (rtc_freq > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE))) return -EACCES; spin_lock_irqsave (&rtc_lock, flags); if (!(rtc_status & RTC_TIMER_ON)) { rtc_irq_timer.expires = jiffies + HZ/rtc_freq + 2*HZ/100; add_timer(&rtc_irq_timer); rtc_status |= RTC_TIMER_ON; } set_rtc_irq_bit_locked(RTC_PIE); spin_unlock_irqrestore (&rtc_lock, flags); return 0; } case RTC_UIE_OFF: /* Mask ints from RTC updates. */ { mask_rtc_irq_bit(RTC_UIE); return 0; } case RTC_UIE_ON: /* Allow ints for RTC updates. */ { set_rtc_irq_bit(RTC_UIE); return 0; } #endif case RTC_ALM_READ: /* Read the present alarm time */ { /* * This returns a struct rtc_time. Reading >= 0xc0 * means "don't care" or "match all". Only the tm_hour, * tm_min, and tm_sec values are filled in. */ memset(&wtime, 0, sizeof(struct rtc_time)); get_rtc_alm_time(&wtime); break; } case RTC_ALM_SET: /* Store a time into the alarm */ { /* * This expects a struct rtc_time. Writing 0xff means * "don't care" or "match all". Only the tm_hour, * tm_min and tm_sec are used. */ unsigned char hrs, min, sec; struct rtc_time alm_tm; if (copy_from_user(&alm_tm, (struct rtc_time __user *)arg, sizeof(struct rtc_time))) return -EFAULT; hrs = alm_tm.tm_hour; min = alm_tm.tm_min; sec = alm_tm.tm_sec; spin_lock_irq(&rtc_lock); if (hpet_set_alarm_time(hrs, min, sec)) { /* * Fallthru and set alarm time in CMOS too, * so that we will get proper value in RTC_ALM_READ */ } if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { if (sec < 60) BIN_TO_BCD(sec); else sec = 0xff; if (min < 60) BIN_TO_BCD(min); else min = 0xff; if (hrs < 24) BIN_TO_BCD(hrs); else hrs = 0xff; } CMOS_WRITE(hrs, RTC_HOURS_ALARM); CMOS_WRITE(min, RTC_MINUTES_ALARM); CMOS_WRITE(sec, RTC_SECONDS_ALARM); spin_unlock_irq(&rtc_lock); return 0; } case RTC_RD_TIME: /* Read the time/date from RTC */ { memset(&wtime, 0, sizeof(struct rtc_time)); rtc_get_rtc_time(&wtime); break; } case RTC_SET_TIME: /* Set the RTC */ { struct rtc_time rtc_tm; unsigned char mon, day, hrs, min, sec, leap_yr; unsigned char save_control, save_freq_select; unsigned int yrs; #ifdef CONFIG_MACH_DECSTATION unsigned int real_yrs; #endif if (!capable(CAP_SYS_TIME)) return -EACCES; if (copy_from_user(&rtc_tm, (struct rtc_time __user *)arg, sizeof(struct rtc_time))) return -EFAULT; yrs = rtc_tm.tm_year + 1900; mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ day = rtc_tm.tm_mday; hrs = rtc_tm.tm_hour; min = rtc_tm.tm_min; sec = rtc_tm.tm_sec; if (yrs < 1970) return -EINVAL; leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); if ((mon > 12) || (day == 0)) return -EINVAL; if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) return -EINVAL; if ((hrs >= 24) || (min >= 60) || (sec >= 60)) return -EINVAL; if ((yrs -= epoch) > 255) /* They are unsigned */ return -EINVAL; spin_lock_irq(&rtc_lock); #ifdef CONFIG_MACH_DECSTATION real_yrs = yrs; yrs = 72; /* * We want to keep the year set to 73 until March * for non-leap years, so that Feb, 29th is handled * correctly. */ if (!leap_yr && mon < 3) { real_yrs--; yrs = 73; } #endif /* These limits and adjustments are independent of * whether the chip is in binary mode or not. */ if (yrs > 169) { spin_unlock_irq(&rtc_lock); return -EINVAL; } 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); #ifdef CONFIG_MACH_DECSTATION CMOS_WRITE(real_yrs, RTC_DEC_YEAR); #endif 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); spin_unlock_irq(&rtc_lock); return 0; } #ifdef RTC_IRQ case RTC_IRQP_READ: /* Read the periodic IRQ rate. */ { return put_user(rtc_freq, (unsigned long __user *)arg); } case RTC_IRQP_SET: /* Set periodic IRQ rate. */ { int tmp = 0; unsigned char val; unsigned long flags; /* can be called from isr via rtc_control() */ /* * The max we can do is 8192Hz. */ if ((arg < 2) || (arg > 8192)) return -EINVAL; /* * We don't really want Joe User generating more * than 64Hz of interrupts on a multi-user machine. */ if (!kernel && (arg > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE))) return -EACCES; while (arg > (1<<tmp)) tmp++; /* * Check that the input was really a power of 2. */ if (arg != (1<<tmp)) return -EINVAL; spin_lock_irqsave(&rtc_lock, flags); if (hpet_set_periodic_freq(arg)) { spin_unlock_irqrestore(&rtc_lock, flags); return 0; } rtc_freq = arg; val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0; val |= (16 - tmp); CMOS_WRITE(val, RTC_FREQ_SELECT); spin_unlock_irqrestore(&rtc_lock, flags); return 0; } #endif case RTC_EPOCH_READ: /* Read the epoch. */ { return put_user (epoch, (unsigned long __user *)arg); } case RTC_EPOCH_SET: /* Set the epoch. */ { /* * There were no RTC clocks before 1900. */ if (arg < 1900) return -EINVAL; if (!capable(CAP_SYS_TIME)) return -EACCES; epoch = arg; return 0; } default: return -ENOTTY; } return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0; }