Munge Stephane Eranian's efirtc.c code into an rtc platform driver Signed-off-by: dann frazier <dannf@xxxxxx> --- arch/ia64/kernel/time.c | 18 +++ drivers/rtc/Kconfig | 10 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-efi.c | 275 +++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 304 insertions(+), 0 deletions(-) create mode 100644 drivers/rtc/rtc-efi.c diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c index f0ebb34..9ed5ba0 100644 --- a/arch/ia64/kernel/time.c +++ b/arch/ia64/kernel/time.c @@ -20,6 +20,7 @@ #include <linux/efi.h> #include <linux/timex.h> #include <linux/clocksource.h> +#include <linux/platform_device.h> #include <asm/machvec.h> #include <asm/delay.h> @@ -405,6 +406,23 @@ static struct irqaction timer_irqaction = { .name = "timer" }; +struct platform_device rtc_efi_dev = { + .name = "rtc-efi", + .id = -1, +}; + +static int __init rtc_init(void) +{ + int ret; + ret = platform_device_register(&rtc_efi_dev); + if (ret < 0) + printk(KERN_ERR "unable to register rtc device...\n"); + + /* not necessarily an error */ + return 0; +} +module_init(rtc_init); + void __init time_init (void) { diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 4ad831d..2cc8a9d 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -434,6 +434,16 @@ config RTC_DRV_DS1742 This driver can also be built as a module. If so, the module will be called rtc-ds1742. +config RTC_DRV_EFI + tristate "EFI RTC" + depends on IA64 + help + If you say yes here you will get support for the EFI + Real Time Clock. + + This driver can also be built as a module. If so, the module + will be called rtc-efi. + config RTC_DRV_STK17TA8 tristate "Simtek STK17TA8" depends on RTC_CLASS diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 9a4340d..09ae207 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o obj-$(CONFIG_RTC_DRV_DS3234) += rtc-ds3234.o +obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o obj-$(CONFIG_RTC_DRV_FM3130) += rtc-fm3130.o obj-$(CONFIG_RTC_DRV_ISL1208) += rtc-isl1208.o diff --git a/drivers/rtc/rtc-efi.c b/drivers/rtc/rtc-efi.c new file mode 100644 index 0000000..1e9607b --- /dev/null +++ b/drivers/rtc/rtc-efi.c @@ -0,0 +1,275 @@ +/* + * rtc-efi: RTC Class Driver for EFI-based systems + * + * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. + * + * Author: dann frazier <dannf@xxxxxx> + * Based on efirtc.c by Stephane Eranian + * + * 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 <linux/kernel.h> +#include <linux/module.h> +#include <linux/time.h> +#include <linux/platform_device.h> + +#include <linux/efi.h> + +#define EFI_ISDST (EFI_TIME_ADJUST_DAYLIGHT|EFI_TIME_IN_DAYLIGHT) +/* + * EFI Epoch is 1/1/1998 + */ +#define EFI_RTC_EPOCH 1998 + +#define LEAP_YEAR(year) ((!(year % 4) && (year % 100)) || !(year % 400)) + +struct efi_rtc { + struct rtc_device *rtc; + spinlock_t lock; +}; + +static const unsigned short int __mon_yday[2][13] = +{ + /* Normal years. */ + { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, + /* Leap years. */ + { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } +}; + +/* + * returns day of the year [0-365] + */ +static inline int +compute_yday(efi_time_t *eft) +{ + /* efi_time_t.month is in the [1-12] so, we need -1 */ + return rtc_year_days(eft->day - 1, eft->month - 1, eft->year); +} +/* + * returns day of the week [0-6] 0=Sunday + * + * Don't try to provide a year that's before 1998, please ! + */ +static int +compute_wday(efi_time_t *eft) +{ + int y; + int ndays = 0; + + if (eft->year < 1998) { + printk(KERN_ERR "efirtc: EFI year < 1998, invalid date\n"); + return -1; + } + + for (y = EFI_RTC_EPOCH; y < eft->year; y++) + ndays += 365 + (LEAP_YEAR(y) ? 1 : 0); + + ndays += compute_yday(eft); + + /* + * 4=1/1/1998 was a Thursday + */ + return (ndays + 4) % 7; +} + +static void +convert_to_efi_time(struct rtc_time *wtime, efi_time_t *eft) +{ + + eft->year = wtime->tm_year + 1900; + eft->month = wtime->tm_mon + 1; + eft->day = wtime->tm_mday; + eft->hour = wtime->tm_hour; + eft->minute = wtime->tm_min; + eft->second = wtime->tm_sec; + eft->nanosecond = 0; + eft->daylight = wtime->tm_isdst ? EFI_ISDST : 0; + eft->timezone = EFI_UNSPECIFIED_TIMEZONE; +} + +static void +convert_from_efi_time(efi_time_t *eft, struct rtc_time *wtime) +{ + memset(wtime, 0, sizeof(*wtime)); + wtime->tm_sec = eft->second; + wtime->tm_min = eft->minute; + wtime->tm_hour = eft->hour; + wtime->tm_mday = eft->day; + wtime->tm_mon = eft->month - 1; + wtime->tm_year = eft->year - 1900; + + /* day of the week [0-6], Sunday=0 */ + wtime->tm_wday = compute_wday(eft); + + /* day in the year [1-365]*/ + wtime->tm_yday = compute_yday(eft); + + + switch (eft->daylight & EFI_ISDST) { + case EFI_ISDST: + wtime->tm_isdst = 1; + break; + case EFI_TIME_ADJUST_DAYLIGHT: + wtime->tm_isdst = 0; + break; + default: + wtime->tm_isdst = -1; + } +} + +static int efi_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) +{ + efi_time_t eft; + efi_status_t status; + + lock_kernel(); + + /* + * As of EFI v1.10, this call always returns an unsupported status + */ + status = efi.get_wakeup_time((efi_bool_t *)&wkalrm->enabled, + (efi_bool_t *)&wkalrm->pending, &eft); + + unlock_kernel(); + + if (status != EFI_SUCCESS) + return -EINVAL; + + convert_from_efi_time(&eft, &wkalrm->time); + + return rtc_valid_tm(&wkalrm->time); +} + +static int efi_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) +{ + efi_time_t eft; + efi_status_t status; + + convert_to_efi_time(&wkalrm->time, &eft); + + lock_kernel(); + + /* + * XXX Fixme: + * As of EFI 0.92 with the firmware I have on my + * machine this call does not seem to work quite + * right + * + * As of v1.10, this call always returns an unsupported status + */ + status = efi.set_wakeup_time((efi_bool_t)wkalrm->enabled, &eft); + + unlock_kernel(); + + printk(KERN_WARNING "write status is %d\n", (int)status); + + return status == EFI_SUCCESS ? 0 : -EINVAL; +} + +static int efi_read_time(struct device *dev, struct rtc_time *tm) +{ + efi_status_t status; + efi_time_t eft; + efi_time_cap_t cap; + + lock_kernel(); + + status = efi.get_time(&eft, &cap); + + unlock_kernel(); + + if (status != EFI_SUCCESS) { + /* should never happen */ + printk(KERN_ERR "efitime: can't read time\n"); + return -EINVAL; + } + + convert_from_efi_time(&eft, tm); + + return rtc_valid_tm(tm); +} + +static int efi_set_time(struct device *dev, struct rtc_time *tm) +{ + efi_status_t status; + efi_time_t eft; + + convert_to_efi_time(tm, &eft); + + lock_kernel(); + + status = efi.set_time(&eft); + + unlock_kernel(); + + return status == EFI_SUCCESS ? 0 : -EINVAL; +} + +static const struct rtc_class_ops efi_rtc_ops = { + .read_time = efi_read_time, + .set_time = efi_set_time, + .read_alarm = efi_read_alarm, + .set_alarm = efi_set_alarm, +}; + +static int __devinit efi_rtc_probe(struct platform_device *dev) +{ + struct rtc_device *rtc; + + rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + rtc = rtc_device_register("rtc-efi", &dev->dev, &efi_rtc_ops, + THIS_MODULE); + if (IS_ERR(rtc)) { + int err = PTR_ERR(rtc); + kfree(rtc); + return err; + } + + platform_set_drvdata(dev, rtc); + + return 0; +} + +static int __devexit efi_rtc_remove(struct platform_device *dev) +{ + struct rtc_device *rtc = platform_get_drvdata(dev); + + rtc_device_unregister(rtc); + kfree(rtc); + + return 0; +} + +static struct platform_driver efi_rtc_driver = { + .driver = { + .name = "rtc-efi", + .owner = THIS_MODULE, + }, + .probe = efi_rtc_probe, + .remove = __devexit_p(efi_rtc_remove), +}; + +static int __init efi_rtc_init(void) +{ + return platform_driver_probe(&efi_rtc_driver, efi_rtc_probe); +} + +static void __exit efi_rtc_exit(void) +{ + platform_driver_unregister(&efi_rtc_driver); +} + +module_init(efi_rtc_init); +module_exit(efi_rtc_exit); + +MODULE_AUTHOR("dann frazier <dannf@xxxxxx>"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("EFI RTC driver"); -- 1.5.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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