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drivers/rtc/rtc-cmos.c
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/* * RTC class driver for "CMOS RTC": PCs, ACPI, etc * * Copyright (C) 1996 Paul Gortmaker (drivers/char/rtc.c) * Copyright (C) 2006 David Brownell (convert to new framework) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ /* * The original "cmos clock" chip was an MC146818 chip, now obsolete. * That defined the register interface now provided by all PCs, some * non-PC systems, and incorporated into ACPI. Modern PC chipsets * integrate an MC146818 clone in their southbridge, and boards use * that instead of discrete clones like the DS12887 or M48T86. There * are also clones that connect using the LPC bus. * * That register API is also used directly by various other drivers * (notably for integrated NVRAM), infrastructure (x86 has code to * bypass the RTC framework, directly reading the RTC during boot * and updating minutes/seconds for systems using NTP synch) and * utilities (like userspace 'hwclock', if no /dev node exists). * * So **ALL** calls to CMOS_READ and CMOS_WRITE must be done with * interrupts disabled, holding the global rtc_lock, to exclude those * other drivers and utilities on correctly configured systems. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/spinlock.h> #include <linux/platform_device.h> #include <linux/mod_devicetable.h> |
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#include <linux/log2.h> |
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#include <linux/pm.h> |
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#include <linux/of.h> #include <linux/of_platform.h> |
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/* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */ #include <asm-generic/rtc.h> |
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struct cmos_rtc { struct rtc_device *rtc; struct device *dev; int irq; struct resource *iomem; |
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void (*wake_on)(struct device *); void (*wake_off)(struct device *); u8 enabled_wake; |
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u8 suspend_ctrl; /* newer hardware extends the original register set */ u8 day_alrm; u8 mon_alrm; u8 century; }; /* both platform and pnp busses use negative numbers for invalid irqs */ |
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#define is_valid_irq(n) ((n) > 0) |
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static const char driver_name[] = "rtc_cmos"; |
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/* The RTC_INTR register may have e.g. RTC_PF set even if RTC_PIE is clear; * always mask it against the irq enable bits in RTC_CONTROL. Bit values * are the same: PF==PIE, AF=AIE, UF=UIE; so RTC_IRQMASK works with both. */ #define RTC_IRQMASK (RTC_PF | RTC_AF | RTC_UF) static inline int is_intr(u8 rtc_intr) { if (!(rtc_intr & RTC_IRQF)) return 0; return rtc_intr & RTC_IRQMASK; } |
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/*----------------------------------------------------------------*/ |
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/* Much modern x86 hardware has HPETs (10+ MHz timers) which, because * many BIOS programmers don't set up "sane mode" IRQ routing, are mostly * used in a broken "legacy replacement" mode. The breakage includes * HPET #1 hijacking the IRQ for this RTC, and being unavailable for * other (better) use. * * When that broken mode is in use, platform glue provides a partial * emulation of hardware RTC IRQ facilities using HPET #1. We don't * want to use HPET for anything except those IRQs though... */ #ifdef CONFIG_HPET_EMULATE_RTC #include <asm/hpet.h> #else static inline int is_hpet_enabled(void) { return 0; } static inline int hpet_mask_rtc_irq_bit(unsigned long mask) { return 0; } static inline int hpet_set_rtc_irq_bit(unsigned long mask) { return 0; } static inline int hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec) { return 0; } static inline int hpet_set_periodic_freq(unsigned long freq) { return 0; } static inline int hpet_rtc_dropped_irq(void) { return 0; } static inline int hpet_rtc_timer_init(void) { return 0; } extern irq_handler_t hpet_rtc_interrupt; static inline int hpet_register_irq_handler(irq_handler_t handler) { return 0; } static inline int hpet_unregister_irq_handler(irq_handler_t handler) { return 0; } #endif /*----------------------------------------------------------------*/ |
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#ifdef RTC_PORT /* Most newer x86 systems have two register banks, the first used * for RTC and NVRAM and the second only for NVRAM. Caller must * own rtc_lock ... and we won't worry about access during NMI. */ #define can_bank2 true static inline unsigned char cmos_read_bank2(unsigned char addr) { outb(addr, RTC_PORT(2)); return inb(RTC_PORT(3)); } static inline void cmos_write_bank2(unsigned char val, unsigned char addr) { outb(addr, RTC_PORT(2)); |
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outb(val, RTC_PORT(3)); |
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} #else #define can_bank2 false static inline unsigned char cmos_read_bank2(unsigned char addr) { return 0; } static inline void cmos_write_bank2(unsigned char val, unsigned char addr) { } #endif /*----------------------------------------------------------------*/ |
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static int cmos_read_time(struct device *dev, struct rtc_time *t) { /* REVISIT: if the clock has a "century" register, use * that instead of the heuristic in get_rtc_time(). * That'll make Y3K compatility (year > 2070) easy! */ get_rtc_time(t); return 0; } static int cmos_set_time(struct device *dev, struct rtc_time *t) { /* REVISIT: set the "century" register if available * * NOTE: this ignores the issue whereby updating the seconds * takes effect exactly 500ms after we write the register. * (Also queueing and other delays before we get this far.) */ return set_rtc_time(t); } static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t) { struct cmos_rtc *cmos = dev_get_drvdata(dev); unsigned char rtc_control; if (!is_valid_irq(cmos->irq)) return -EIO; /* Basic alarms only support hour, minute, and seconds fields. * Some also support day and month, for alarms up to a year in * the future. */ t->time.tm_mday = -1; t->time.tm_mon = -1; spin_lock_irq(&rtc_lock); t->time.tm_sec = CMOS_READ(RTC_SECONDS_ALARM); t->time.tm_min = CMOS_READ(RTC_MINUTES_ALARM); t->time.tm_hour = CMOS_READ(RTC_HOURS_ALARM); if (cmos->day_alrm) { |
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/* ignore upper bits on readback per ACPI spec */ t->time.tm_mday = CMOS_READ(cmos->day_alrm) & 0x3f; |
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if (!t->time.tm_mday) t->time.tm_mday = -1; if (cmos->mon_alrm) { t->time.tm_mon = CMOS_READ(cmos->mon_alrm); if (!t->time.tm_mon) t->time.tm_mon = -1; } } rtc_control = CMOS_READ(RTC_CONTROL); spin_unlock_irq(&rtc_lock); |
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if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { if (((unsigned)t->time.tm_sec) < 0x60) t->time.tm_sec = bcd2bin(t->time.tm_sec); |
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else |
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t->time.tm_sec = -1; if (((unsigned)t->time.tm_min) < 0x60) t->time.tm_min = bcd2bin(t->time.tm_min); else t->time.tm_min = -1; if (((unsigned)t->time.tm_hour) < 0x24) t->time.tm_hour = bcd2bin(t->time.tm_hour); else t->time.tm_hour = -1; if (cmos->day_alrm) { if (((unsigned)t->time.tm_mday) <= 0x31) t->time.tm_mday = bcd2bin(t->time.tm_mday); |
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else |
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t->time.tm_mday = -1; if (cmos->mon_alrm) { if (((unsigned)t->time.tm_mon) <= 0x12) t->time.tm_mon = bcd2bin(t->time.tm_mon)-1; else t->time.tm_mon = -1; } |
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} } t->time.tm_year = -1; t->enabled = !!(rtc_control & RTC_AIE); t->pending = 0; return 0; } |
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static void cmos_checkintr(struct cmos_rtc *cmos, unsigned char rtc_control) { unsigned char rtc_intr; /* NOTE after changing RTC_xIE bits we always read INTR_FLAGS; * allegedly some older rtcs need that to handle irqs properly */ rtc_intr = CMOS_READ(RTC_INTR_FLAGS); if (is_hpet_enabled()) return; rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF; if (is_intr(rtc_intr)) rtc_update_irq(cmos->rtc, 1, rtc_intr); } static void cmos_irq_enable(struct cmos_rtc *cmos, unsigned char mask) { unsigned char rtc_control; /* flush any pending IRQ status, notably for update irqs, * before we enable new IRQs */ rtc_control = CMOS_READ(RTC_CONTROL); cmos_checkintr(cmos, rtc_control); rtc_control |= mask; CMOS_WRITE(rtc_control, RTC_CONTROL); hpet_set_rtc_irq_bit(mask); cmos_checkintr(cmos, rtc_control); } static void cmos_irq_disable(struct cmos_rtc *cmos, unsigned char mask) { unsigned char rtc_control; rtc_control = CMOS_READ(RTC_CONTROL); rtc_control &= ~mask; CMOS_WRITE(rtc_control, RTC_CONTROL); hpet_mask_rtc_irq_bit(mask); cmos_checkintr(cmos, rtc_control); } |
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static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t) { struct cmos_rtc *cmos = dev_get_drvdata(dev); |
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unsigned char mon, mday, hrs, min, sec, rtc_control; |
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if (!is_valid_irq(cmos->irq)) return -EIO; |
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mon = t->time.tm_mon + 1; |
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mday = t->time.tm_mday; |
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hrs = t->time.tm_hour; |
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min = t->time.tm_min; |
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sec = t->time.tm_sec; |
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rtc_control = CMOS_READ(RTC_CONTROL); if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { /* Writing 0xff means "don't care" or "match all". */ mon = (mon <= 12) ? bin2bcd(mon) : 0xff; mday = (mday >= 1 && mday <= 31) ? bin2bcd(mday) : 0xff; hrs = (hrs < 24) ? bin2bcd(hrs) : 0xff; min = (min < 60) ? bin2bcd(min) : 0xff; sec = (sec < 60) ? bin2bcd(sec) : 0xff; } |
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spin_lock_irq(&rtc_lock); /* next rtc irq must not be from previous alarm setting */ |
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cmos_irq_disable(cmos, RTC_AIE); |
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/* update alarm */ CMOS_WRITE(hrs, RTC_HOURS_ALARM); CMOS_WRITE(min, RTC_MINUTES_ALARM); CMOS_WRITE(sec, RTC_SECONDS_ALARM); /* the system may support an "enhanced" alarm */ if (cmos->day_alrm) { CMOS_WRITE(mday, cmos->day_alrm); if (cmos->mon_alrm) CMOS_WRITE(mon, cmos->mon_alrm); } |
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/* FIXME the HPET alarm glue currently ignores day_alrm * and mon_alrm ... */ hpet_set_alarm_time(t->time.tm_hour, t->time.tm_min, t->time.tm_sec); |
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if (t->enabled) cmos_irq_enable(cmos, RTC_AIE); |
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spin_unlock_irq(&rtc_lock); return 0; } |
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static int cmos_alarm_irq_enable(struct device *dev, unsigned int enabled) |
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{ struct cmos_rtc *cmos = dev_get_drvdata(dev); |
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unsigned long flags; |
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if (!is_valid_irq(cmos->irq)) return -EINVAL; |
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spin_lock_irqsave(&rtc_lock, flags); |
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if (enabled) |
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cmos_irq_enable(cmos, RTC_AIE); |
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else cmos_irq_disable(cmos, RTC_AIE); |
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spin_unlock_irqrestore(&rtc_lock, flags); return 0; } |
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#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) static int cmos_procfs(struct device *dev, struct seq_file *seq) { struct cmos_rtc *cmos = dev_get_drvdata(dev); unsigned char rtc_control, valid; spin_lock_irq(&rtc_lock); rtc_control = CMOS_READ(RTC_CONTROL); valid = CMOS_READ(RTC_VALID); spin_unlock_irq(&rtc_lock); /* NOTE: at least ICH6 reports battery status using a different * (non-RTC) bit; and SQWE is ignored on many current systems. */ return seq_printf(seq, "periodic_IRQ\t: %s " "update_IRQ\t: %s " |
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"HPET_emulated\t: %s " |
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// "square_wave\t: %s " |
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"BCD\t\t: %s " |
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"DST_enable\t: %s " "periodic_freq\t: %d " "batt_status\t: %s ", (rtc_control & RTC_PIE) ? "yes" : "no", (rtc_control & RTC_UIE) ? "yes" : "no", |
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is_hpet_enabled() ? "yes" : "no", |
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// (rtc_control & RTC_SQWE) ? "yes" : "no", |
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(rtc_control & RTC_DM_BINARY) ? "no" : "yes", |
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(rtc_control & RTC_DST_EN) ? "yes" : "no", cmos->rtc->irq_freq, (valid & RTC_VRT) ? "okay" : "dead"); } #else #define cmos_procfs NULL #endif static const struct rtc_class_ops cmos_rtc_ops = { |
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.read_time = cmos_read_time, .set_time = cmos_set_time, .read_alarm = cmos_read_alarm, .set_alarm = cmos_set_alarm, .proc = cmos_procfs, |
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.alarm_irq_enable = cmos_alarm_irq_enable, |
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}; /*----------------------------------------------------------------*/ |
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/* * All these chips have at least 64 bytes of address space, shared by * RTC registers and NVRAM. Most of those bytes of NVRAM are used * by boot firmware. Modern chips have 128 or 256 bytes. */ #define NVRAM_OFFSET (RTC_REG_D + 1) static ssize_t |
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cmos_nvram_read(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, |
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char *buf, loff_t off, size_t count) { int retval; if (unlikely(off >= attr->size)) return 0; |
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if (unlikely(off < 0)) return -EINVAL; |
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if ((off + count) > attr->size) count = attr->size - off; |
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off += NVRAM_OFFSET; |
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spin_lock_irq(&rtc_lock); |
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for (retval = 0; count; count--, off++, retval++) { if (off < 128) *buf++ = CMOS_READ(off); else if (can_bank2) *buf++ = cmos_read_bank2(off); else break; } |
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spin_unlock_irq(&rtc_lock); return retval; } static ssize_t |
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cmos_nvram_write(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, |
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char *buf, loff_t off, size_t count) { struct cmos_rtc *cmos; int retval; cmos = dev_get_drvdata(container_of(kobj, struct device, kobj)); if (unlikely(off >= attr->size)) return -EFBIG; |
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if (unlikely(off < 0)) return -EINVAL; |
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if ((off + count) > attr->size) count = attr->size - off; /* NOTE: on at least PCs and Ataris, the boot firmware uses a * checksum on part of the NVRAM data. That's currently ignored * here. If userspace is smart enough to know what fields of * NVRAM to update, updating checksums is also part of its job. */ |
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off += NVRAM_OFFSET; |
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spin_lock_irq(&rtc_lock); |
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for (retval = 0; count; count--, off++, retval++) { |
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/* don't trash RTC registers */ if (off == cmos->day_alrm || off == cmos->mon_alrm || off == cmos->century) buf++; |
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else if (off < 128) |
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CMOS_WRITE(*buf++, off); |
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else if (can_bank2) cmos_write_bank2(*buf++, off); else break; |
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} spin_unlock_irq(&rtc_lock); return retval; } static struct bin_attribute nvram = { .attr = { .name = "nvram", .mode = S_IRUGO | S_IWUSR, |
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}, .read = cmos_nvram_read, .write = cmos_nvram_write, /* size gets set up later */ }; /*----------------------------------------------------------------*/ |
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static struct cmos_rtc cmos_rtc; static irqreturn_t cmos_interrupt(int irq, void *p) { u8 irqstat; |
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u8 rtc_control; |
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spin_lock(&rtc_lock); |
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/* When the HPET interrupt handler calls us, the interrupt * status is passed as arg1 instead of the irq number. But * always clear irq status, even when HPET is in the way. * * Note that HPET and RTC are almost certainly out of phase, * giving different IRQ status ... |
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*/ |
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irqstat = CMOS_READ(RTC_INTR_FLAGS); rtc_control = CMOS_READ(RTC_CONTROL); |
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if (is_hpet_enabled()) irqstat = (unsigned long)irq & 0xF0; |
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irqstat &= (rtc_control & RTC_IRQMASK) | RTC_IRQF; |
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/* All Linux RTC alarms should be treated as if they were oneshot. * Similar code may be needed in system wakeup paths, in case the * alarm woke the system. */ if (irqstat & RTC_AIE) { rtc_control &= ~RTC_AIE; CMOS_WRITE(rtc_control, RTC_CONTROL); |
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hpet_mask_rtc_irq_bit(RTC_AIE); |
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CMOS_READ(RTC_INTR_FLAGS); } |
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spin_unlock(&rtc_lock); |
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if (is_intr(irqstat)) { |
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rtc_update_irq(p, 1, irqstat); return IRQ_HANDLED; } else return IRQ_NONE; } |
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#ifdef CONFIG_PNP |
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#define INITSECTION #else |
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#define INITSECTION __init #endif 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; |
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unsigned address_space; |
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/* there can be only one ... */ if (cmos_rtc.dev) return -EBUSY; if (!ports) return -ENODEV; |
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/* 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, |
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resource_size(ports), |
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driver_name); if (!ports) { dev_dbg(dev, "i/o registers already in use "); return -EBUSY; } |
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cmos_rtc.irq = rtc_irq; cmos_rtc.iomem = ports; |
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/* Heuristic to deduce NVRAM size ... do what the legacy NVRAM * driver did, but don't reject unknown configs. Old hardware |
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* won't address 128 bytes. Newer chips have multiple banks, * though they may not be listed in one I/O resource. |
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606 607 608 |
*/ #if defined(CONFIG_ATARI) address_space = 64; |
95abd0dfa RTC: rtc-cmos.c: ... |
609 |
#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) \ |
8cb7c71bd rtc-cmos.c : Fix ... |
610 611 |
|| defined(__sparc__) || defined(__mips__) \ || defined(__powerpc__) |
e07e232cd rtc-cmos: export ... |
612 613 614 615 616 |
address_space = 128; #else #warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes. address_space = 128; #endif |
c8fc40cd3 rtc-cmos: export ... |
617 618 |
if (can_bank2 && ports->end > (ports->start + 1)) address_space = 256; |
e07e232cd rtc-cmos: export ... |
619 |
|
87ac84f42 rtc-cmos wakeup i... |
620 621 622 623 |
/* 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. |
e07e232cd rtc-cmos: export ... |
624 625 626 627 |
* * 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. |
7be2c7c96 [PATCH] RTC frame... |
628 629 |
*/ if (info) { |
e07e232cd rtc-cmos: export ... |
630 631 632 633 634 635 |
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; |
87ac84f42 rtc-cmos wakeup i... |
636 637 638 639 640 |
if (info->wake_on && info->wake_off) { cmos_rtc.wake_on = info->wake_on; cmos_rtc.wake_off = info->wake_off; } |
7be2c7c96 [PATCH] RTC frame... |
641 |
} |
6ba8bcd45 rtc-cmos: do dev_... |
642 643 |
cmos_rtc.dev = dev; dev_set_drvdata(dev, &cmos_rtc); |
7be2c7c96 [PATCH] RTC frame... |
644 645 |
cmos_rtc.rtc = rtc_device_register(driver_name, dev, &cmos_rtc_ops, THIS_MODULE); |
05440dfcf rtc-cmos probe() ... |
646 647 648 649 |
if (IS_ERR(cmos_rtc.rtc)) { retval = PTR_ERR(cmos_rtc.rtc); goto cleanup0; } |
7be2c7c96 [PATCH] RTC frame... |
650 |
|
d4afc76c0 rtc: struct devic... |
651 |
rename_region(ports, dev_name(&cmos_rtc.rtc->dev)); |
7be2c7c96 [PATCH] RTC frame... |
652 653 654 655 656 657 658 659 660 |
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. */ |
7be2c7c96 [PATCH] RTC frame... |
661 |
cmos_rtc.rtc->irq_freq = 1024; |
35d3fdd5f rtc-cmos: improve... |
662 663 |
hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq); CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT); |
7be2c7c96 [PATCH] RTC frame... |
664 |
|
7e2a31da8 rtc-cmos: avoid s... |
665 666 |
/* disable irqs */ cmos_irq_disable(&cmos_rtc, RTC_PIE | RTC_AIE | RTC_UIE); |
35d3fdd5f rtc-cmos: improve... |
667 |
|
7e2a31da8 rtc-cmos: avoid s... |
668 |
rtc_control = CMOS_READ(RTC_CONTROL); |
7be2c7c96 [PATCH] RTC frame... |
669 670 |
spin_unlock_irq(&rtc_lock); |
3804a89bf RTC: rtc-cmos: Fi... |
671 |
/* FIXME: |
7be2c7c96 [PATCH] RTC frame... |
672 673 |
* <asm-generic/rtc.h> doesn't know 12-hour mode either. */ |
3804a89bf RTC: rtc-cmos: Fi... |
674 675 676 |
if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) { dev_warn(dev, "only 24-hr supported "); |
7be2c7c96 [PATCH] RTC frame... |
677 678 679 |
retval = -ENXIO; goto cleanup1; } |
9d8af78b0 rtc: add HPET RTC... |
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 |
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, |
d4afc76c0 rtc: struct devic... |
697 |
IRQF_DISABLED, dev_name(&cmos_rtc.rtc->dev), |
ab6a2d70d rtc: rtc interfac... |
698 |
cmos_rtc.rtc); |
9d8af78b0 rtc: add HPET RTC... |
699 700 701 702 703 |
if (retval < 0) { dev_dbg(dev, "IRQ %d is already in use ", rtc_irq); goto cleanup1; } |
7be2c7c96 [PATCH] RTC frame... |
704 |
} |
9d8af78b0 rtc: add HPET RTC... |
705 |
hpet_rtc_timer_init(); |
7be2c7c96 [PATCH] RTC frame... |
706 |
|
e07e232cd rtc-cmos: export ... |
707 708 709 710 711 712 713 714 |
/* 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 ", retval); goto cleanup2; } |
7be2c7c96 [PATCH] RTC frame... |
715 |
|
6d029b645 rtc-cmos: fix pri... |
716 717 718 719 720 721 722 723 724 725 |
pr_info("%s: %s%s, %zd bytes nvram%s ", 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" : ""); |
7be2c7c96 [PATCH] RTC frame... |
726 727 |
return 0; |
e07e232cd rtc-cmos: export ... |
728 729 730 |
cleanup2: if (is_valid_irq(rtc_irq)) free_irq(rtc_irq, cmos_rtc.rtc); |
7be2c7c96 [PATCH] RTC frame... |
731 |
cleanup1: |
05440dfcf rtc-cmos probe() ... |
732 |
cmos_rtc.dev = NULL; |
7be2c7c96 [PATCH] RTC frame... |
733 |
rtc_device_unregister(cmos_rtc.rtc); |
05440dfcf rtc-cmos probe() ... |
734 |
cleanup0: |
28f65c11f treewide: Convert... |
735 |
release_region(ports->start, resource_size(ports)); |
7be2c7c96 [PATCH] RTC frame... |
736 737 738 739 740 |
return retval; } static void cmos_do_shutdown(void) { |
7be2c7c96 [PATCH] RTC frame... |
741 |
spin_lock_irq(&rtc_lock); |
7e2a31da8 rtc-cmos: avoid s... |
742 |
cmos_irq_disable(&cmos_rtc, RTC_IRQMASK); |
7be2c7c96 [PATCH] RTC frame... |
743 744 745 746 747 748 |
spin_unlock_irq(&rtc_lock); } static void __exit cmos_do_remove(struct device *dev) { struct cmos_rtc *cmos = dev_get_drvdata(dev); |
05440dfcf rtc-cmos probe() ... |
749 |
struct resource *ports; |
7be2c7c96 [PATCH] RTC frame... |
750 751 |
cmos_do_shutdown(); |
e07e232cd rtc-cmos: export ... |
752 |
sysfs_remove_bin_file(&dev->kobj, &nvram); |
9d8af78b0 rtc: add HPET RTC... |
753 |
if (is_valid_irq(cmos->irq)) { |
05440dfcf rtc-cmos probe() ... |
754 |
free_irq(cmos->irq, cmos->rtc); |
9d8af78b0 rtc: add HPET RTC... |
755 756 |
hpet_unregister_irq_handler(cmos_interrupt); } |
7be2c7c96 [PATCH] RTC frame... |
757 |
|
05440dfcf rtc-cmos probe() ... |
758 759 |
rtc_device_unregister(cmos->rtc); cmos->rtc = NULL; |
7be2c7c96 [PATCH] RTC frame... |
760 |
|
05440dfcf rtc-cmos probe() ... |
761 |
ports = cmos->iomem; |
28f65c11f treewide: Convert... |
762 |
release_region(ports->start, resource_size(ports)); |
05440dfcf rtc-cmos probe() ... |
763 764 765 |
cmos->iomem = NULL; cmos->dev = NULL; |
7be2c7c96 [PATCH] RTC frame... |
766 767 768 769 |
dev_set_drvdata(dev, NULL); } #ifdef CONFIG_PM |
2fb08e6ca rtc-cmos: fix sus... |
770 |
static int cmos_suspend(struct device *dev) |
7be2c7c96 [PATCH] RTC frame... |
771 772 |
{ struct cmos_rtc *cmos = dev_get_drvdata(dev); |
bcd9b89c0 [PATCH] rtc-cmos ... |
773 |
unsigned char tmp; |
7be2c7c96 [PATCH] RTC frame... |
774 775 776 777 778 |
/* only the alarm might be a wakeup event source */ spin_lock_irq(&rtc_lock); cmos->suspend_ctrl = tmp = CMOS_READ(RTC_CONTROL); if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) { |
35d3fdd5f rtc-cmos: improve... |
779 |
unsigned char mask; |
bcd9b89c0 [PATCH] rtc-cmos ... |
780 |
|
74c4633da rtc-cmos: wake ag... |
781 |
if (device_may_wakeup(dev)) |
35d3fdd5f rtc-cmos: improve... |
782 |
mask = RTC_IRQMASK & ~RTC_AIE; |
7be2c7c96 [PATCH] RTC frame... |
783 |
else |
35d3fdd5f rtc-cmos: improve... |
784 785 |
mask = RTC_IRQMASK; tmp &= ~mask; |
7be2c7c96 [PATCH] RTC frame... |
786 |
CMOS_WRITE(tmp, RTC_CONTROL); |
35d3fdd5f rtc-cmos: improve... |
787 |
|
d1b2efa83 rtc: disable hpet... |
788 789 |
/* shut down hpet emulation - we don't need it for alarm */ hpet_mask_rtc_irq_bit(RTC_PIE|RTC_AIE|RTC_UIE); |
7e2a31da8 rtc-cmos: avoid s... |
790 |
cmos_checkintr(cmos, tmp); |
bcd9b89c0 [PATCH] rtc-cmos ... |
791 |
} |
7be2c7c96 [PATCH] RTC frame... |
792 |
spin_unlock_irq(&rtc_lock); |
87ac84f42 rtc-cmos wakeup i... |
793 794 795 796 797 798 799 |
if (tmp & RTC_AIE) { cmos->enabled_wake = 1; if (cmos->wake_on) cmos->wake_on(dev); else enable_irq_wake(cmos->irq); } |
7be2c7c96 [PATCH] RTC frame... |
800 801 802 |
pr_debug("%s: suspend%s, ctrl %02x ", |
d4afc76c0 rtc: struct devic... |
803 |
dev_name(&cmos_rtc.rtc->dev), |
7be2c7c96 [PATCH] RTC frame... |
804 805 806 807 808 |
(tmp & RTC_AIE) ? ", alarm may wake" : "", tmp); return 0; } |
74c4633da rtc-cmos: wake ag... |
809 810 811 812 813 814 815 816 |
/* We want RTC alarms to wake us from e.g. ACPI G2/S5 "soft off", even * after a detour through G3 "mechanical off", although the ACPI spec * says wakeup should only work from G1/S4 "hibernate". To most users, * distinctions between S4 and S5 are pointless. So when the hardware * allows, don't draw that distinction. */ static inline int cmos_poweroff(struct device *dev) { |
2fb08e6ca rtc-cmos: fix sus... |
817 |
return cmos_suspend(dev); |
74c4633da rtc-cmos: wake ag... |
818 |
} |
7be2c7c96 [PATCH] RTC frame... |
819 820 821 822 |
static int cmos_resume(struct device *dev) { struct cmos_rtc *cmos = dev_get_drvdata(dev); unsigned char tmp = cmos->suspend_ctrl; |
7be2c7c96 [PATCH] RTC frame... |
823 |
/* re-enable any irqs previously active */ |
35d3fdd5f rtc-cmos: improve... |
824 825 |
if (tmp & RTC_IRQMASK) { unsigned char mask; |
7be2c7c96 [PATCH] RTC frame... |
826 |
|
87ac84f42 rtc-cmos wakeup i... |
827 828 829 830 831 832 833 |
if (cmos->enabled_wake) { if (cmos->wake_off) cmos->wake_off(dev); else disable_irq_wake(cmos->irq); cmos->enabled_wake = 0; } |
7be2c7c96 [PATCH] RTC frame... |
834 835 |
spin_lock_irq(&rtc_lock); |
35d3fdd5f rtc-cmos: improve... |
836 837 838 839 840 841 |
do { CMOS_WRITE(tmp, RTC_CONTROL); hpet_set_rtc_irq_bit(tmp & RTC_IRQMASK); mask = CMOS_READ(RTC_INTR_FLAGS); mask &= (tmp & RTC_IRQMASK) | RTC_IRQF; |
7e2a31da8 rtc-cmos: avoid s... |
842 |
if (!is_hpet_enabled() || !is_intr(mask)) |
35d3fdd5f rtc-cmos: improve... |
843 844 845 846 847 848 849 850 851 |
break; /* force one-shot behavior if HPET blocked * the wake alarm's irq */ rtc_update_irq(cmos->rtc, 1, mask); tmp &= ~RTC_AIE; hpet_mask_rtc_irq_bit(RTC_AIE); } while (mask & RTC_AIE); |
bcd9b89c0 [PATCH] rtc-cmos ... |
852 |
spin_unlock_irq(&rtc_lock); |
7be2c7c96 [PATCH] RTC frame... |
853 854 855 856 |
} pr_debug("%s: resume, ctrl %02x ", |
d4afc76c0 rtc: struct devic... |
857 |
dev_name(&cmos_rtc.rtc->dev), |
35d3fdd5f rtc-cmos: improve... |
858 |
tmp); |
7be2c7c96 [PATCH] RTC frame... |
859 860 861 |
return 0; } |
2fb08e6ca rtc-cmos: fix sus... |
862 |
static SIMPLE_DEV_PM_OPS(cmos_pm_ops, cmos_suspend, cmos_resume); |
7be2c7c96 [PATCH] RTC frame... |
863 |
#else |
74c4633da rtc-cmos: wake ag... |
864 865 866 867 868 |
static inline int cmos_poweroff(struct device *dev) { return -ENOSYS; } |
7be2c7c96 [PATCH] RTC frame... |
869 870 871 |
#endif /*----------------------------------------------------------------*/ |
e07e232cd rtc-cmos: export ... |
872 873 874 875 876 877 |
/* On non-x86 systems, a "CMOS" RTC lives most naturally on platform_bus. * ACPI systems always list these as PNPACPI devices, and pre-ACPI PCs * probably list them in similar PNPBIOS tables; so PNP is more common. * * We don't use legacy "poke at the hardware" probing. Ancient PCs that * predate even PNPBIOS should set up platform_bus devices. |
7be2c7c96 [PATCH] RTC frame... |
878 |
*/ |
a474aaeda rtc-cmos: move wa... |
879 880 881 |
#ifdef CONFIG_ACPI #include <linux/acpi.h> |
a474aaeda rtc-cmos: move wa... |
882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 |
static u32 rtc_handler(void *context) { acpi_clear_event(ACPI_EVENT_RTC); acpi_disable_event(ACPI_EVENT_RTC, 0); return ACPI_INTERRUPT_HANDLED; } static inline void rtc_wake_setup(void) { acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL); /* * After the RTC handler is installed, the Fixed_RTC event should * be disabled. Only when the RTC alarm is set will it be enabled. */ acpi_clear_event(ACPI_EVENT_RTC); acpi_disable_event(ACPI_EVENT_RTC, 0); } static void rtc_wake_on(struct device *dev) { acpi_clear_event(ACPI_EVENT_RTC); acpi_enable_event(ACPI_EVENT_RTC, 0); } static void rtc_wake_off(struct device *dev) { acpi_disable_event(ACPI_EVENT_RTC, 0); } |
a474aaeda rtc-cmos: move wa... |
910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 |
/* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find * its device node and pass extra config data. This helps its driver use * capabilities that the now-obsolete mc146818 didn't have, and informs it * that this board's RTC is wakeup-capable (per ACPI spec). */ static struct cmos_rtc_board_info acpi_rtc_info; static void __devinit cmos_wake_setup(struct device *dev) { if (acpi_disabled) return; rtc_wake_setup(); acpi_rtc_info.wake_on = rtc_wake_on; acpi_rtc_info.wake_off = rtc_wake_off; /* workaround bug in some ACPI tables */ if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) { dev_dbg(dev, "bogus FADT month_alarm (%d) ", acpi_gbl_FADT.month_alarm); acpi_gbl_FADT.month_alarm = 0; } acpi_rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm; acpi_rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm; acpi_rtc_info.rtc_century = acpi_gbl_FADT.century; /* NOTE: S4_RTC_WAKE is NOT currently useful to Linux */ if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE) dev_info(dev, "RTC can wake from S4 "); dev->platform_data = &acpi_rtc_info; /* RTC always wakes from S1/S2/S3, and often S4/STD */ device_init_wakeup(dev, 1); } #else static void __devinit cmos_wake_setup(struct device *dev) { } #endif |
41ac8df9d rtc-cmos: make it... |
959 |
#ifdef CONFIG_PNP |
7be2c7c96 [PATCH] RTC frame... |
960 961 962 963 964 965 |
#include <linux/pnp.h> static int __devinit cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) { |
a474aaeda rtc-cmos: move wa... |
966 |
cmos_wake_setup(&pnp->dev); |
6cd8fa87f RTC: use fallback... |
967 968 969 970 971 |
if (pnp_port_start(pnp,0) == 0x70 && !pnp_irq_valid(pnp,0)) /* Some machines contain a PNP entry for the RTC, but * don't define the IRQ. It should always be safe to * hardcode it in these cases */ |
8766ad0ce rtc: dont referen... |
972 973 |
return cmos_do_probe(&pnp->dev, pnp_get_resource(pnp, IORESOURCE_IO, 0), 8); |
6cd8fa87f RTC: use fallback... |
974 975 |
else return cmos_do_probe(&pnp->dev, |
8766ad0ce rtc: dont referen... |
976 977 |
pnp_get_resource(pnp, IORESOURCE_IO, 0), pnp_irq(pnp, 0)); |
7be2c7c96 [PATCH] RTC frame... |
978 979 980 981 982 983 984 985 986 987 988 |
} static void __exit cmos_pnp_remove(struct pnp_dev *pnp) { cmos_do_remove(&pnp->dev); } #ifdef CONFIG_PM static int cmos_pnp_suspend(struct pnp_dev *pnp, pm_message_t mesg) { |
2fb08e6ca rtc-cmos: fix sus... |
989 |
return cmos_suspend(&pnp->dev); |
7be2c7c96 [PATCH] RTC frame... |
990 991 992 993 994 995 996 997 998 999 1000 |
} static int cmos_pnp_resume(struct pnp_dev *pnp) { return cmos_resume(&pnp->dev); } #else #define cmos_pnp_suspend NULL #define cmos_pnp_resume NULL #endif |
004731b2c rtc_cmos: convert... |
1001 |
static void cmos_pnp_shutdown(struct pnp_dev *pnp) |
74c4633da rtc-cmos: wake ag... |
1002 |
{ |
004731b2c rtc_cmos: convert... |
1003 |
if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(&pnp->dev)) |
74c4633da rtc-cmos: wake ag... |
1004 1005 1006 1007 |
return; cmos_do_shutdown(); } |
7be2c7c96 [PATCH] RTC frame... |
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 |
static const struct pnp_device_id rtc_ids[] = { { .id = "PNP0b00", }, { .id = "PNP0b01", }, { .id = "PNP0b02", }, { }, }; MODULE_DEVICE_TABLE(pnp, rtc_ids); static struct pnp_driver cmos_pnp_driver = { .name = (char *) driver_name, .id_table = rtc_ids, .probe = cmos_pnp_probe, .remove = __exit_p(cmos_pnp_remove), |
004731b2c rtc_cmos: convert... |
1022 |
.shutdown = cmos_pnp_shutdown, |
7be2c7c96 [PATCH] RTC frame... |
1023 1024 1025 1026 1027 1028 |
/* flag ensures resume() gets called, and stops syslog spam */ .flags = PNP_DRIVER_RES_DO_NOT_CHANGE, .suspend = cmos_pnp_suspend, .resume = cmos_pnp_resume, }; |
1da2e3d67 provide rtc_cmos ... |
1029 |
#endif /* CONFIG_PNP */ |
7be2c7c96 [PATCH] RTC frame... |
1030 |
|
3bcbaf6e0 rtc: cmos: Add OF... |
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 |
#ifdef CONFIG_OF static const struct of_device_id of_cmos_match[] = { { .compatible = "motorola,mc146818", }, { }, }; MODULE_DEVICE_TABLE(of, of_cmos_match); static __init void cmos_of_init(struct platform_device *pdev) { struct device_node *node = pdev->dev.of_node; struct rtc_time time; int ret; const __be32 *val; if (!node) return; val = of_get_property(node, "ctrl-reg", NULL); if (val) CMOS_WRITE(be32_to_cpup(val), RTC_CONTROL); val = of_get_property(node, "freq-reg", NULL); if (val) CMOS_WRITE(be32_to_cpup(val), RTC_FREQ_SELECT); get_rtc_time(&time); ret = rtc_valid_tm(&time); if (ret) { struct rtc_time def_time = { .tm_year = 1, .tm_mday = 1, }; set_rtc_time(&def_time); } } #else static inline void cmos_of_init(struct platform_device *pdev) {} #define of_cmos_match NULL #endif |
7be2c7c96 [PATCH] RTC frame... |
1072 |
/*----------------------------------------------------------------*/ |
41ac8df9d rtc-cmos: make it... |
1073 |
/* Platform setup should have set up an RTC device, when PNP is |
bcd9b89c0 [PATCH] rtc-cmos ... |
1074 |
* unavailable ... this could happen even on (older) PCs. |
7be2c7c96 [PATCH] RTC frame... |
1075 1076 1077 1078 |
*/ static int __init cmos_platform_probe(struct platform_device *pdev) { |
3bcbaf6e0 rtc: cmos: Add OF... |
1079 |
cmos_of_init(pdev); |
a474aaeda rtc-cmos: move wa... |
1080 |
cmos_wake_setup(&pdev->dev); |
7be2c7c96 [PATCH] RTC frame... |
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 |
return cmos_do_probe(&pdev->dev, platform_get_resource(pdev, IORESOURCE_IO, 0), platform_get_irq(pdev, 0)); } static int __exit cmos_platform_remove(struct platform_device *pdev) { cmos_do_remove(&pdev->dev); return 0; } static void cmos_platform_shutdown(struct platform_device *pdev) { |
74c4633da rtc-cmos: wake ag... |
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if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(&pdev->dev)) return; |
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cmos_do_shutdown(); } |
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/* work with hotplug and coldplug */ MODULE_ALIAS("platform:rtc_cmos"); |
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static struct platform_driver cmos_platform_driver = { .remove = __exit_p(cmos_platform_remove), .shutdown = cmos_platform_shutdown, .driver = { .name = (char *) driver_name, |
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#ifdef CONFIG_PM .pm = &cmos_pm_ops, #endif |
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.of_match_table = of_cmos_match, |
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} }; |
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#ifdef CONFIG_PNP static bool pnp_driver_registered; #endif static bool platform_driver_registered; |
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static int __init cmos_init(void) { |
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int retval = 0; |
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#ifdef CONFIG_PNP |
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retval = pnp_register_driver(&cmos_pnp_driver); if (retval == 0) pnp_driver_registered = true; |
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#endif |
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if (!cmos_rtc.dev) { |
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retval = platform_driver_probe(&cmos_platform_driver, cmos_platform_probe); |
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if (retval == 0) platform_driver_registered = true; } |
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if (retval == 0) return 0; #ifdef CONFIG_PNP |
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if (pnp_driver_registered) pnp_unregister_driver(&cmos_pnp_driver); |
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#endif return retval; |
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} module_init(cmos_init); static void __exit cmos_exit(void) { |
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#ifdef CONFIG_PNP |
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if (pnp_driver_registered) pnp_unregister_driver(&cmos_pnp_driver); |
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#endif |
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if (platform_driver_registered) platform_driver_unregister(&cmos_platform_driver); |
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} module_exit(cmos_exit); |
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MODULE_AUTHOR("David Brownell"); MODULE_DESCRIPTION("Driver for PC-style 'CMOS' RTCs"); MODULE_LICENSE("GPL"); |