From: Andrew Victor Date: Sun, 10 Dec 2006 10:19:03 +0000 (-0800) Subject: [PATCH] AT91RM9200 RTC X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7fc39f6d616a852750ddaac86f5e4c3fad804ef8;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git [PATCH] AT91RM9200 RTC The new Atmel AT91SAM9261 and AT91SAM9260 processors do not have the internal RTC peripheral. This RTC driver is therefore AT91RM9200-specific. This patch renames rtc-at91.c to rtc-at91rm9200.c, and changes the name of the configuration option. Signed-off-by: Andrew Victor Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 2a63ab2b47f4..09660e2ab051 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -288,7 +288,7 @@ config RTC_DRV_PL031 To compile this driver as a module, choose M here: the module will be called rtc-pl031. -config RTC_DRV_AT91 +config RTC_DRV_AT91RM9200 tristate "AT91RM9200" depends on RTC_CLASS && ARCH_AT91RM9200 help diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index bd4c45d333f0..e6beedacc966 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -35,5 +35,5 @@ obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o -obj-$(CONFIG_RTC_DRV_AT91) += rtc-at91.o +obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o obj-$(CONFIG_RTC_DRV_SH) += rtc-sh.o diff --git a/drivers/rtc/rtc-at91.c b/drivers/rtc/rtc-at91.c deleted file mode 100644 index 5c8addcaf1fb..000000000000 --- a/drivers/rtc/rtc-at91.c +++ /dev/null @@ -1,429 +0,0 @@ -/* - * Real Time Clock interface for Linux on Atmel AT91RM9200 - * - * Copyright (C) 2002 Rick Bronson - * - * Converted to RTC class model by Andrew Victor - * - * Ported to Linux 2.6 by Steven Scholz - * Based on s3c2410-rtc.c Simtec Electronics - * - * Based on sa1100-rtc.c by Nils Faerber - * Based on rtc.c by Paul Gortmaker - * - * 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. - * - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -#include - - -#define AT91_RTC_FREQ 1 -#define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */ - -static DECLARE_COMPLETION(at91_rtc_updated); -static unsigned int at91_alarm_year = AT91_RTC_EPOCH; - -/* - * Decode time/date into rtc_time structure - */ -static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg, - struct rtc_time *tm) -{ - unsigned int time, date; - - /* must read twice in case it changes */ - do { - time = at91_sys_read(timereg); - date = at91_sys_read(calreg); - } while ((time != at91_sys_read(timereg)) || - (date != at91_sys_read(calreg))); - - tm->tm_sec = BCD2BIN((time & AT91_RTC_SEC) >> 0); - tm->tm_min = BCD2BIN((time & AT91_RTC_MIN) >> 8); - tm->tm_hour = BCD2BIN((time & AT91_RTC_HOUR) >> 16); - - /* - * The Calendar Alarm register does not have a field for - * the year - so these will return an invalid value. When an - * alarm is set, at91_alarm_year wille store the current year. - */ - tm->tm_year = BCD2BIN(date & AT91_RTC_CENT) * 100; /* century */ - tm->tm_year += BCD2BIN((date & AT91_RTC_YEAR) >> 8); /* year */ - - tm->tm_wday = BCD2BIN((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */ - tm->tm_mon = BCD2BIN((date & AT91_RTC_MONTH) >> 16) - 1; - tm->tm_mday = BCD2BIN((date & AT91_RTC_DATE) >> 24); -} - -/* - * Read current time and date in RTC - */ -static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm) -{ - at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm); - tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); - tm->tm_year = tm->tm_year - 1900; - - pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, - 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, - tm->tm_hour, tm->tm_min, tm->tm_sec); - - return 0; -} - -/* - * Set current time and date in RTC - */ -static int at91_rtc_settime(struct device *dev, struct rtc_time *tm) -{ - unsigned long cr; - - pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, - 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, - tm->tm_hour, tm->tm_min, tm->tm_sec); - - /* Stop Time/Calendar from counting */ - cr = at91_sys_read(AT91_RTC_CR); - at91_sys_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM); - - at91_sys_write(AT91_RTC_IER, AT91_RTC_ACKUPD); - wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */ - at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD); - - at91_sys_write(AT91_RTC_TIMR, - BIN2BCD(tm->tm_sec) << 0 - | BIN2BCD(tm->tm_min) << 8 - | BIN2BCD(tm->tm_hour) << 16); - - at91_sys_write(AT91_RTC_CALR, - BIN2BCD((tm->tm_year + 1900) / 100) /* century */ - | BIN2BCD(tm->tm_year % 100) << 8 /* year */ - | BIN2BCD(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */ - | BIN2BCD(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */ - | BIN2BCD(tm->tm_mday) << 24); - - /* Restart Time/Calendar */ - cr = at91_sys_read(AT91_RTC_CR); - at91_sys_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM)); - - return 0; -} - -/* - * Read alarm time and date in RTC - */ -static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) -{ - struct rtc_time *tm = &alrm->time; - - at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm); - tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); - tm->tm_year = at91_alarm_year - 1900; - - pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, - 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, - tm->tm_hour, tm->tm_min, tm->tm_sec); - - return 0; -} - -/* - * Set alarm time and date in RTC - */ -static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) -{ - struct rtc_time tm; - - at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm); - - at91_alarm_year = tm.tm_year; - - tm.tm_hour = alrm->time.tm_hour; - tm.tm_min = alrm->time.tm_min; - tm.tm_sec = alrm->time.tm_sec; - - at91_sys_write(AT91_RTC_TIMALR, - BIN2BCD(tm.tm_sec) << 0 - | BIN2BCD(tm.tm_min) << 8 - | BIN2BCD(tm.tm_hour) << 16 - | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN); - at91_sys_write(AT91_RTC_CALALR, - BIN2BCD(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */ - | BIN2BCD(tm.tm_mday) << 24 - | AT91_RTC_DATEEN | AT91_RTC_MTHEN); - - pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, - at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, - tm.tm_min, tm.tm_sec); - - return 0; -} - -/* - * Handle commands from user-space - */ -static int at91_rtc_ioctl(struct device *dev, unsigned int cmd, - unsigned long arg) -{ - int ret = 0; - - pr_debug("%s(): cmd=%08x, arg=%08lx.\n", __FUNCTION__, cmd, arg); - - switch (cmd) { - case RTC_AIE_OFF: /* alarm off */ - at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM); - break; - case RTC_AIE_ON: /* alarm on */ - at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM); - break; - case RTC_UIE_OFF: /* update off */ - case RTC_PIE_OFF: /* periodic off */ - at91_sys_write(AT91_RTC_IDR, AT91_RTC_SECEV); - break; - case RTC_UIE_ON: /* update on */ - case RTC_PIE_ON: /* periodic on */ - at91_sys_write(AT91_RTC_IER, AT91_RTC_SECEV); - break; - case RTC_IRQP_READ: /* read periodic alarm frequency */ - ret = put_user(AT91_RTC_FREQ, (unsigned long *) arg); - break; - case RTC_IRQP_SET: /* set periodic alarm frequency */ - if (arg != AT91_RTC_FREQ) - ret = -EINVAL; - break; - default: - ret = -ENOIOCTLCMD; - break; - } - - return ret; -} - -/* - * Provide additional RTC information in /proc/driver/rtc - */ -static int at91_rtc_proc(struct device *dev, struct seq_file *seq) -{ - unsigned long imr = at91_sys_read(AT91_RTC_IMR); - - seq_printf(seq, "alarm_IRQ\t: %s\n", - (imr & AT91_RTC_ALARM) ? "yes" : "no"); - seq_printf(seq, "update_IRQ\t: %s\n", - (imr & AT91_RTC_ACKUPD) ? "yes" : "no"); - seq_printf(seq, "periodic_IRQ\t: %s\n", - (imr & AT91_RTC_SECEV) ? "yes" : "no"); - seq_printf(seq, "periodic_freq\t: %ld\n", - (unsigned long) AT91_RTC_FREQ); - - return 0; -} - -/* - * IRQ handler for the RTC - */ -static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id) -{ - struct platform_device *pdev = dev_id; - struct rtc_device *rtc = platform_get_drvdata(pdev); - unsigned int rtsr; - unsigned long events = 0; - - rtsr = at91_sys_read(AT91_RTC_SR) & at91_sys_read(AT91_RTC_IMR); - if (rtsr) { /* this interrupt is shared! Is it ours? */ - if (rtsr & AT91_RTC_ALARM) - events |= (RTC_AF | RTC_IRQF); - if (rtsr & AT91_RTC_SECEV) - events |= (RTC_UF | RTC_IRQF); - if (rtsr & AT91_RTC_ACKUPD) - complete(&at91_rtc_updated); - - at91_sys_write(AT91_RTC_SCCR, rtsr); /* clear status reg */ - - rtc_update_irq(&rtc->class_dev, 1, events); - - pr_debug("%s(): num=%ld, events=0x%02lx\n", __FUNCTION__, - events >> 8, events & 0x000000FF); - - return IRQ_HANDLED; - } - return IRQ_NONE; /* not handled */ -} - -static const struct rtc_class_ops at91_rtc_ops = { - .ioctl = at91_rtc_ioctl, - .read_time = at91_rtc_readtime, - .set_time = at91_rtc_settime, - .read_alarm = at91_rtc_readalarm, - .set_alarm = at91_rtc_setalarm, - .proc = at91_rtc_proc, -}; - -/* - * Initialize and install RTC driver - */ -static int __init at91_rtc_probe(struct platform_device *pdev) -{ - struct rtc_device *rtc; - int ret; - - at91_sys_write(AT91_RTC_CR, 0); - at91_sys_write(AT91_RTC_MR, 0); /* 24 hour mode */ - - /* Disable all interrupts */ - at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | - AT91_RTC_SECEV | AT91_RTC_TIMEV | - AT91_RTC_CALEV); - - ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt, - IRQF_DISABLED | IRQF_SHARED, - "at91_rtc", pdev); - if (ret) { - printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n", - AT91_ID_SYS); - return ret; - } - - rtc = rtc_device_register(pdev->name, &pdev->dev, - &at91_rtc_ops, THIS_MODULE); - if (IS_ERR(rtc)) { - free_irq(AT91_ID_SYS, pdev); - return PTR_ERR(rtc); - } - platform_set_drvdata(pdev, rtc); - device_init_wakeup(&pdev->dev, 1); - - printk(KERN_INFO "AT91 Real Time Clock driver.\n"); - return 0; -} - -/* - * Disable and remove the RTC driver - */ -static int __devexit at91_rtc_remove(struct platform_device *pdev) -{ - struct rtc_device *rtc = platform_get_drvdata(pdev); - - /* Disable all interrupts */ - at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | - AT91_RTC_SECEV | AT91_RTC_TIMEV | - AT91_RTC_CALEV); - free_irq(AT91_ID_SYS, pdev); - - rtc_device_unregister(rtc); - platform_set_drvdata(pdev, NULL); - device_init_wakeup(&pdev->dev, 0); - - return 0; -} - -#ifdef CONFIG_PM - -/* AT91RM9200 RTC Power management control */ - -static struct timespec at91_rtc_delta; -static u32 at91_rtc_imr; - -static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state) -{ - struct rtc_time tm; - struct timespec time; - - time.tv_nsec = 0; - - /* calculate time delta for suspend */ - at91_rtc_readtime(&pdev->dev, &tm); - rtc_tm_to_time(&tm, &time.tv_sec); - save_time_delta(&at91_rtc_delta, &time); - - /* this IRQ is shared with DBGU and other hardware which isn't - * necessarily doing PM like we are... - */ - at91_rtc_imr = at91_sys_read(AT91_RTC_IMR) - & (AT91_RTC_ALARM|AT91_RTC_SECEV); - if (at91_rtc_imr) { - if (device_may_wakeup(&pdev->dev)) - enable_irq_wake(AT91_ID_SYS); - else - at91_sys_write(AT91_RTC_IDR, at91_rtc_imr); - } - - pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, - 1900 + tm.tm_year, tm.tm_mon, tm.tm_mday, - tm.tm_hour, tm.tm_min, tm.tm_sec); - - return 0; -} - -static int at91_rtc_resume(struct platform_device *pdev) -{ - struct rtc_time tm; - struct timespec time; - - time.tv_nsec = 0; - - at91_rtc_readtime(&pdev->dev, &tm); - rtc_tm_to_time(&tm, &time.tv_sec); - restore_time_delta(&at91_rtc_delta, &time); - - if (at91_rtc_imr) { - if (device_may_wakeup(&pdev->dev)) - disable_irq_wake(AT91_ID_SYS); - else - at91_sys_write(AT91_RTC_IER, at91_rtc_imr); - } - - pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, - 1900 + tm.tm_year, tm.tm_mon, tm.tm_mday, - tm.tm_hour, tm.tm_min, tm.tm_sec); - - return 0; -} -#else -#define at91_rtc_suspend NULL -#define at91_rtc_resume NULL -#endif - -static struct platform_driver at91_rtc_driver = { - .probe = at91_rtc_probe, - .remove = at91_rtc_remove, - .suspend = at91_rtc_suspend, - .resume = at91_rtc_resume, - .driver = { - .name = "at91_rtc", - .owner = THIS_MODULE, - }, -}; - -static int __init at91_rtc_init(void) -{ - return platform_driver_register(&at91_rtc_driver); -} - -static void __exit at91_rtc_exit(void) -{ - platform_driver_unregister(&at91_rtc_driver); -} - -module_init(at91_rtc_init); -module_exit(at91_rtc_exit); - -MODULE_AUTHOR("Rick Bronson"); -MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200"); -MODULE_LICENSE("GPL"); diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c new file mode 100644 index 000000000000..5c8addcaf1fb --- /dev/null +++ b/drivers/rtc/rtc-at91rm9200.c @@ -0,0 +1,429 @@ +/* + * Real Time Clock interface for Linux on Atmel AT91RM9200 + * + * Copyright (C) 2002 Rick Bronson + * + * Converted to RTC class model by Andrew Victor + * + * Ported to Linux 2.6 by Steven Scholz + * Based on s3c2410-rtc.c Simtec Electronics + * + * Based on sa1100-rtc.c by Nils Faerber + * Based on rtc.c by Paul Gortmaker + * + * 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. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include + + +#define AT91_RTC_FREQ 1 +#define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */ + +static DECLARE_COMPLETION(at91_rtc_updated); +static unsigned int at91_alarm_year = AT91_RTC_EPOCH; + +/* + * Decode time/date into rtc_time structure + */ +static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg, + struct rtc_time *tm) +{ + unsigned int time, date; + + /* must read twice in case it changes */ + do { + time = at91_sys_read(timereg); + date = at91_sys_read(calreg); + } while ((time != at91_sys_read(timereg)) || + (date != at91_sys_read(calreg))); + + tm->tm_sec = BCD2BIN((time & AT91_RTC_SEC) >> 0); + tm->tm_min = BCD2BIN((time & AT91_RTC_MIN) >> 8); + tm->tm_hour = BCD2BIN((time & AT91_RTC_HOUR) >> 16); + + /* + * The Calendar Alarm register does not have a field for + * the year - so these will return an invalid value. When an + * alarm is set, at91_alarm_year wille store the current year. + */ + tm->tm_year = BCD2BIN(date & AT91_RTC_CENT) * 100; /* century */ + tm->tm_year += BCD2BIN((date & AT91_RTC_YEAR) >> 8); /* year */ + + tm->tm_wday = BCD2BIN((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */ + tm->tm_mon = BCD2BIN((date & AT91_RTC_MONTH) >> 16) - 1; + tm->tm_mday = BCD2BIN((date & AT91_RTC_DATE) >> 24); +} + +/* + * Read current time and date in RTC + */ +static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm) +{ + at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm); + tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); + tm->tm_year = tm->tm_year - 1900; + + pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, + 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, + tm->tm_hour, tm->tm_min, tm->tm_sec); + + return 0; +} + +/* + * Set current time and date in RTC + */ +static int at91_rtc_settime(struct device *dev, struct rtc_time *tm) +{ + unsigned long cr; + + pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, + 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, + tm->tm_hour, tm->tm_min, tm->tm_sec); + + /* Stop Time/Calendar from counting */ + cr = at91_sys_read(AT91_RTC_CR); + at91_sys_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM); + + at91_sys_write(AT91_RTC_IER, AT91_RTC_ACKUPD); + wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */ + at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD); + + at91_sys_write(AT91_RTC_TIMR, + BIN2BCD(tm->tm_sec) << 0 + | BIN2BCD(tm->tm_min) << 8 + | BIN2BCD(tm->tm_hour) << 16); + + at91_sys_write(AT91_RTC_CALR, + BIN2BCD((tm->tm_year + 1900) / 100) /* century */ + | BIN2BCD(tm->tm_year % 100) << 8 /* year */ + | BIN2BCD(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */ + | BIN2BCD(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */ + | BIN2BCD(tm->tm_mday) << 24); + + /* Restart Time/Calendar */ + cr = at91_sys_read(AT91_RTC_CR); + at91_sys_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM)); + + return 0; +} + +/* + * Read alarm time and date in RTC + */ +static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct rtc_time *tm = &alrm->time; + + at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm); + tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); + tm->tm_year = at91_alarm_year - 1900; + + pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, + 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, + tm->tm_hour, tm->tm_min, tm->tm_sec); + + return 0; +} + +/* + * Set alarm time and date in RTC + */ +static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct rtc_time tm; + + at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm); + + at91_alarm_year = tm.tm_year; + + tm.tm_hour = alrm->time.tm_hour; + tm.tm_min = alrm->time.tm_min; + tm.tm_sec = alrm->time.tm_sec; + + at91_sys_write(AT91_RTC_TIMALR, + BIN2BCD(tm.tm_sec) << 0 + | BIN2BCD(tm.tm_min) << 8 + | BIN2BCD(tm.tm_hour) << 16 + | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN); + at91_sys_write(AT91_RTC_CALALR, + BIN2BCD(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */ + | BIN2BCD(tm.tm_mday) << 24 + | AT91_RTC_DATEEN | AT91_RTC_MTHEN); + + pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, + at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, + tm.tm_min, tm.tm_sec); + + return 0; +} + +/* + * Handle commands from user-space + */ +static int at91_rtc_ioctl(struct device *dev, unsigned int cmd, + unsigned long arg) +{ + int ret = 0; + + pr_debug("%s(): cmd=%08x, arg=%08lx.\n", __FUNCTION__, cmd, arg); + + switch (cmd) { + case RTC_AIE_OFF: /* alarm off */ + at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM); + break; + case RTC_AIE_ON: /* alarm on */ + at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM); + break; + case RTC_UIE_OFF: /* update off */ + case RTC_PIE_OFF: /* periodic off */ + at91_sys_write(AT91_RTC_IDR, AT91_RTC_SECEV); + break; + case RTC_UIE_ON: /* update on */ + case RTC_PIE_ON: /* periodic on */ + at91_sys_write(AT91_RTC_IER, AT91_RTC_SECEV); + break; + case RTC_IRQP_READ: /* read periodic alarm frequency */ + ret = put_user(AT91_RTC_FREQ, (unsigned long *) arg); + break; + case RTC_IRQP_SET: /* set periodic alarm frequency */ + if (arg != AT91_RTC_FREQ) + ret = -EINVAL; + break; + default: + ret = -ENOIOCTLCMD; + break; + } + + return ret; +} + +/* + * Provide additional RTC information in /proc/driver/rtc + */ +static int at91_rtc_proc(struct device *dev, struct seq_file *seq) +{ + unsigned long imr = at91_sys_read(AT91_RTC_IMR); + + seq_printf(seq, "alarm_IRQ\t: %s\n", + (imr & AT91_RTC_ALARM) ? "yes" : "no"); + seq_printf(seq, "update_IRQ\t: %s\n", + (imr & AT91_RTC_ACKUPD) ? "yes" : "no"); + seq_printf(seq, "periodic_IRQ\t: %s\n", + (imr & AT91_RTC_SECEV) ? "yes" : "no"); + seq_printf(seq, "periodic_freq\t: %ld\n", + (unsigned long) AT91_RTC_FREQ); + + return 0; +} + +/* + * IRQ handler for the RTC + */ +static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id) +{ + struct platform_device *pdev = dev_id; + struct rtc_device *rtc = platform_get_drvdata(pdev); + unsigned int rtsr; + unsigned long events = 0; + + rtsr = at91_sys_read(AT91_RTC_SR) & at91_sys_read(AT91_RTC_IMR); + if (rtsr) { /* this interrupt is shared! Is it ours? */ + if (rtsr & AT91_RTC_ALARM) + events |= (RTC_AF | RTC_IRQF); + if (rtsr & AT91_RTC_SECEV) + events |= (RTC_UF | RTC_IRQF); + if (rtsr & AT91_RTC_ACKUPD) + complete(&at91_rtc_updated); + + at91_sys_write(AT91_RTC_SCCR, rtsr); /* clear status reg */ + + rtc_update_irq(&rtc->class_dev, 1, events); + + pr_debug("%s(): num=%ld, events=0x%02lx\n", __FUNCTION__, + events >> 8, events & 0x000000FF); + + return IRQ_HANDLED; + } + return IRQ_NONE; /* not handled */ +} + +static const struct rtc_class_ops at91_rtc_ops = { + .ioctl = at91_rtc_ioctl, + .read_time = at91_rtc_readtime, + .set_time = at91_rtc_settime, + .read_alarm = at91_rtc_readalarm, + .set_alarm = at91_rtc_setalarm, + .proc = at91_rtc_proc, +}; + +/* + * Initialize and install RTC driver + */ +static int __init at91_rtc_probe(struct platform_device *pdev) +{ + struct rtc_device *rtc; + int ret; + + at91_sys_write(AT91_RTC_CR, 0); + at91_sys_write(AT91_RTC_MR, 0); /* 24 hour mode */ + + /* Disable all interrupts */ + at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | + AT91_RTC_SECEV | AT91_RTC_TIMEV | + AT91_RTC_CALEV); + + ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt, + IRQF_DISABLED | IRQF_SHARED, + "at91_rtc", pdev); + if (ret) { + printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n", + AT91_ID_SYS); + return ret; + } + + rtc = rtc_device_register(pdev->name, &pdev->dev, + &at91_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc)) { + free_irq(AT91_ID_SYS, pdev); + return PTR_ERR(rtc); + } + platform_set_drvdata(pdev, rtc); + device_init_wakeup(&pdev->dev, 1); + + printk(KERN_INFO "AT91 Real Time Clock driver.\n"); + return 0; +} + +/* + * Disable and remove the RTC driver + */ +static int __devexit at91_rtc_remove(struct platform_device *pdev) +{ + struct rtc_device *rtc = platform_get_drvdata(pdev); + + /* Disable all interrupts */ + at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | + AT91_RTC_SECEV | AT91_RTC_TIMEV | + AT91_RTC_CALEV); + free_irq(AT91_ID_SYS, pdev); + + rtc_device_unregister(rtc); + platform_set_drvdata(pdev, NULL); + device_init_wakeup(&pdev->dev, 0); + + return 0; +} + +#ifdef CONFIG_PM + +/* AT91RM9200 RTC Power management control */ + +static struct timespec at91_rtc_delta; +static u32 at91_rtc_imr; + +static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct rtc_time tm; + struct timespec time; + + time.tv_nsec = 0; + + /* calculate time delta for suspend */ + at91_rtc_readtime(&pdev->dev, &tm); + rtc_tm_to_time(&tm, &time.tv_sec); + save_time_delta(&at91_rtc_delta, &time); + + /* this IRQ is shared with DBGU and other hardware which isn't + * necessarily doing PM like we are... + */ + at91_rtc_imr = at91_sys_read(AT91_RTC_IMR) + & (AT91_RTC_ALARM|AT91_RTC_SECEV); + if (at91_rtc_imr) { + if (device_may_wakeup(&pdev->dev)) + enable_irq_wake(AT91_ID_SYS); + else + at91_sys_write(AT91_RTC_IDR, at91_rtc_imr); + } + + pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, + 1900 + tm.tm_year, tm.tm_mon, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec); + + return 0; +} + +static int at91_rtc_resume(struct platform_device *pdev) +{ + struct rtc_time tm; + struct timespec time; + + time.tv_nsec = 0; + + at91_rtc_readtime(&pdev->dev, &tm); + rtc_tm_to_time(&tm, &time.tv_sec); + restore_time_delta(&at91_rtc_delta, &time); + + if (at91_rtc_imr) { + if (device_may_wakeup(&pdev->dev)) + disable_irq_wake(AT91_ID_SYS); + else + at91_sys_write(AT91_RTC_IER, at91_rtc_imr); + } + + pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__, + 1900 + tm.tm_year, tm.tm_mon, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec); + + return 0; +} +#else +#define at91_rtc_suspend NULL +#define at91_rtc_resume NULL +#endif + +static struct platform_driver at91_rtc_driver = { + .probe = at91_rtc_probe, + .remove = at91_rtc_remove, + .suspend = at91_rtc_suspend, + .resume = at91_rtc_resume, + .driver = { + .name = "at91_rtc", + .owner = THIS_MODULE, + }, +}; + +static int __init at91_rtc_init(void) +{ + return platform_driver_register(&at91_rtc_driver); +} + +static void __exit at91_rtc_exit(void) +{ + platform_driver_unregister(&at91_rtc_driver); +} + +module_init(at91_rtc_init); +module_exit(at91_rtc_exit); + +MODULE_AUTHOR("Rick Bronson"); +MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200"); +MODULE_LICENSE("GPL");