diff options
Diffstat (limited to 'drivers/char/s3c2410-rtc.c')
| -rw-r--r-- | drivers/char/s3c2410-rtc.c | 591 |
1 files changed, 0 insertions, 591 deletions
diff --git a/drivers/char/s3c2410-rtc.c b/drivers/char/s3c2410-rtc.c deleted file mode 100644 index 5458ef1634e5..000000000000 --- a/drivers/char/s3c2410-rtc.c +++ /dev/null @@ -1,591 +0,0 @@ -/* drivers/char/s3c2410_rtc.c - * - * Copyright (c) 2004 Simtec Electronics <linux@simtec.co.uk> - * http://www.simtec.co.uk/products/SWLINUX/ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * S3C2410 Internal RTC Driver - * - * Changelog: - * 08-Nov-2004 BJD Initial creation - * 12-Nov-2004 BJD Added periodic IRQ and PM code - * 22-Nov-2004 BJD Sign-test on alarm code to check for <0 - * 10-Mar-2005 LCVR Changed S3C2410_VA_RTC to S3C24XX_VA_RTC -*/ - -#include <linux/module.h> -#include <linux/fs.h> -#include <linux/string.h> -#include <linux/init.h> -#include <linux/platform_device.h> -#include <linux/interrupt.h> -#include <linux/rtc.h> -#include <linux/bcd.h> -#include <linux/clk.h> - -#include <asm/hardware.h> -#include <asm/uaccess.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/rtc.h> - -#include <asm/mach/time.h> - -#include <asm/arch/regs-rtc.h> - -/* need this for the RTC_AF definitions */ -#include <linux/mc146818rtc.h> - -#undef S3C24XX_VA_RTC -#define S3C24XX_VA_RTC s3c2410_rtc_base - -static struct resource *s3c2410_rtc_mem; - -static void __iomem *s3c2410_rtc_base; -static int s3c2410_rtc_alarmno = NO_IRQ; -static int s3c2410_rtc_tickno = NO_IRQ; -static int s3c2410_rtc_freq = 1; - -static DEFINE_SPINLOCK(s3c2410_rtc_pie_lock); - -/* IRQ Handlers */ - -static irqreturn_t s3c2410_rtc_alarmirq(int irq, void *id, struct pt_regs *r) -{ - rtc_update(1, RTC_AF | RTC_IRQF); - return IRQ_HANDLED; -} - -static irqreturn_t s3c2410_rtc_tickirq(int irq, void *id, struct pt_regs *r) -{ - rtc_update(1, RTC_PF | RTC_IRQF); - return IRQ_HANDLED; -} - -/* Update control registers */ -static void s3c2410_rtc_setaie(int to) -{ - unsigned int tmp; - - pr_debug("%s: aie=%d\n", __FUNCTION__, to); - - tmp = readb(S3C2410_RTCALM); - - if (to) - tmp |= S3C2410_RTCALM_ALMEN; - else - tmp &= ~S3C2410_RTCALM_ALMEN; - - - writeb(tmp, S3C2410_RTCALM); -} - -static void s3c2410_rtc_setpie(int to) -{ - unsigned int tmp; - - pr_debug("%s: pie=%d\n", __FUNCTION__, to); - - spin_lock_irq(&s3c2410_rtc_pie_lock); - tmp = readb(S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE; - - if (to) - tmp |= S3C2410_TICNT_ENABLE; - - writeb(tmp, S3C2410_TICNT); - spin_unlock_irq(&s3c2410_rtc_pie_lock); -} - -static void s3c2410_rtc_setfreq(int freq) -{ - unsigned int tmp; - - spin_lock_irq(&s3c2410_rtc_pie_lock); - tmp = readb(S3C2410_TICNT) & S3C2410_TICNT_ENABLE; - - s3c2410_rtc_freq = freq; - - tmp |= (128 / freq)-1; - - writeb(tmp, S3C2410_TICNT); - spin_unlock_irq(&s3c2410_rtc_pie_lock); -} - -/* Time read/write */ - -static int s3c2410_rtc_gettime(struct rtc_time *rtc_tm) -{ - unsigned int have_retried = 0; - - retry_get_time: - rtc_tm->tm_min = readb(S3C2410_RTCMIN); - rtc_tm->tm_hour = readb(S3C2410_RTCHOUR); - rtc_tm->tm_mday = readb(S3C2410_RTCDATE); - rtc_tm->tm_mon = readb(S3C2410_RTCMON); - rtc_tm->tm_year = readb(S3C2410_RTCYEAR); - rtc_tm->tm_sec = readb(S3C2410_RTCSEC); - - /* the only way to work out wether the system was mid-update - * when we read it is to check the second counter, and if it - * is zero, then we re-try the entire read - */ - - if (rtc_tm->tm_sec == 0 && !have_retried) { - have_retried = 1; - goto retry_get_time; - } - - pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n", - rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, - rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec); - - BCD_TO_BIN(rtc_tm->tm_sec); - BCD_TO_BIN(rtc_tm->tm_min); - BCD_TO_BIN(rtc_tm->tm_hour); - BCD_TO_BIN(rtc_tm->tm_mday); - BCD_TO_BIN(rtc_tm->tm_mon); - BCD_TO_BIN(rtc_tm->tm_year); - - rtc_tm->tm_year += 100; - rtc_tm->tm_mon -= 1; - - return 0; -} - - -static int s3c2410_rtc_settime(struct rtc_time *tm) -{ - /* the rtc gets round the y2k problem by just not supporting it */ - - if (tm->tm_year < 100) - return -EINVAL; - - writeb(BIN2BCD(tm->tm_sec), S3C2410_RTCSEC); - writeb(BIN2BCD(tm->tm_min), S3C2410_RTCMIN); - writeb(BIN2BCD(tm->tm_hour), S3C2410_RTCHOUR); - writeb(BIN2BCD(tm->tm_mday), S3C2410_RTCDATE); - writeb(BIN2BCD(tm->tm_mon + 1), S3C2410_RTCMON); - writeb(BIN2BCD(tm->tm_year - 100), S3C2410_RTCYEAR); - - return 0; -} - -static int s3c2410_rtc_getalarm(struct rtc_wkalrm *alrm) -{ - struct rtc_time *alm_tm = &alrm->time; - unsigned int alm_en; - - alm_tm->tm_sec = readb(S3C2410_ALMSEC); - alm_tm->tm_min = readb(S3C2410_ALMMIN); - alm_tm->tm_hour = readb(S3C2410_ALMHOUR); - alm_tm->tm_mon = readb(S3C2410_ALMMON); - alm_tm->tm_mday = readb(S3C2410_ALMDATE); - alm_tm->tm_year = readb(S3C2410_ALMYEAR); - - alm_en = readb(S3C2410_RTCALM); - - pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n", - alm_en, - alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday, - alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec); - - - /* decode the alarm enable field */ - - if (alm_en & S3C2410_RTCALM_SECEN) { - BCD_TO_BIN(alm_tm->tm_sec); - } else { - alm_tm->tm_sec = 0xff; - } - - if (alm_en & S3C2410_RTCALM_MINEN) { - BCD_TO_BIN(alm_tm->tm_min); - } else { - alm_tm->tm_min = 0xff; - } - - if (alm_en & S3C2410_RTCALM_HOUREN) { - BCD_TO_BIN(alm_tm->tm_hour); - } else { - alm_tm->tm_hour = 0xff; - } - - if (alm_en & S3C2410_RTCALM_DAYEN) { - BCD_TO_BIN(alm_tm->tm_mday); - } else { - alm_tm->tm_mday = 0xff; - } - - if (alm_en & S3C2410_RTCALM_MONEN) { - BCD_TO_BIN(alm_tm->tm_mon); - alm_tm->tm_mon -= 1; - } else { - alm_tm->tm_mon = 0xff; - } - - if (alm_en & S3C2410_RTCALM_YEAREN) { - BCD_TO_BIN(alm_tm->tm_year); - } else { - alm_tm->tm_year = 0xffff; - } - - /* todo - set alrm->enabled ? */ - - return 0; -} - -static int s3c2410_rtc_setalarm(struct rtc_wkalrm *alrm) -{ - struct rtc_time *tm = &alrm->time; - unsigned int alrm_en; - - pr_debug("s3c2410_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n", - alrm->enabled, - tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff, - tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec); - - if (alrm->enabled || 1) { - alrm_en = readb(S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN; - writeb(0x00, S3C2410_RTCALM); - - if (tm->tm_sec < 60 && tm->tm_sec >= 0) { - alrm_en |= S3C2410_RTCALM_SECEN; - writeb(BIN2BCD(tm->tm_sec), S3C2410_ALMSEC); - } - - if (tm->tm_min < 60 && tm->tm_min >= 0) { - alrm_en |= S3C2410_RTCALM_MINEN; - writeb(BIN2BCD(tm->tm_min), S3C2410_ALMMIN); - } - - if (tm->tm_hour < 24 && tm->tm_hour >= 0) { - alrm_en |= S3C2410_RTCALM_HOUREN; - writeb(BIN2BCD(tm->tm_hour), S3C2410_ALMHOUR); - } - - pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en); - - writeb(alrm_en, S3C2410_RTCALM); - enable_irq_wake(s3c2410_rtc_alarmno); - } else { - alrm_en = readb(S3C2410_RTCALM); - alrm_en &= ~S3C2410_RTCALM_ALMEN; - writeb(alrm_en, S3C2410_RTCALM); - disable_irq_wake(s3c2410_rtc_alarmno); - } - - return 0; -} - -static int s3c2410_rtc_ioctl(unsigned int cmd, unsigned long arg) -{ - switch (cmd) { - case RTC_AIE_OFF: - case RTC_AIE_ON: - s3c2410_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0); - return 0; - - case RTC_PIE_OFF: - case RTC_PIE_ON: - s3c2410_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0); - return 0; - - case RTC_IRQP_READ: - return put_user(s3c2410_rtc_freq, (unsigned long __user *)arg); - - case RTC_IRQP_SET: - if (arg < 1 || arg > 64) - return -EINVAL; - - if (!capable(CAP_SYS_RESOURCE)) - return -EACCES; - - /* check for power of 2 */ - - if ((arg & (arg-1)) != 0) - return -EINVAL; - - pr_debug("s3c2410_rtc: setting frequency %ld\n", arg); - - s3c2410_rtc_setfreq(arg); - return 0; - - case RTC_UIE_ON: - case RTC_UIE_OFF: - return -EINVAL; - } - - return -EINVAL; -} - -static int s3c2410_rtc_proc(char *buf) -{ - unsigned int rtcalm = readb(S3C2410_RTCALM); - unsigned int ticnt = readb (S3C2410_TICNT); - char *p = buf; - - p += sprintf(p, "alarm_IRQ\t: %s\n", - (rtcalm & S3C2410_RTCALM_ALMEN) ? "yes" : "no" ); - p += sprintf(p, "periodic_IRQ\t: %s\n", - (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" ); - p += sprintf(p, "periodic_freq\t: %d\n", s3c2410_rtc_freq); - - return p - buf; -} - -static int s3c2410_rtc_open(void) -{ - int ret; - - ret = request_irq(s3c2410_rtc_alarmno, s3c2410_rtc_alarmirq, - IRQF_DISABLED, "s3c2410-rtc alarm", NULL); - - if (ret) - printk(KERN_ERR "IRQ%d already in use\n", s3c2410_rtc_alarmno); - - ret = request_irq(s3c2410_rtc_tickno, s3c2410_rtc_tickirq, - IRQF_DISABLED, "s3c2410-rtc tick", NULL); - - if (ret) { - printk(KERN_ERR "IRQ%d already in use\n", s3c2410_rtc_tickno); - goto tick_err; - } - - return ret; - - tick_err: - free_irq(s3c2410_rtc_alarmno, NULL); - return ret; -} - -static void s3c2410_rtc_release(void) -{ - /* do not clear AIE here, it may be needed for wake */ - - s3c2410_rtc_setpie(0); - free_irq(s3c2410_rtc_alarmno, NULL); - free_irq(s3c2410_rtc_tickno, NULL); -} - -static struct rtc_ops s3c2410_rtcops = { - .owner = THIS_MODULE, - .open = s3c2410_rtc_open, - .release = s3c2410_rtc_release, - .ioctl = s3c2410_rtc_ioctl, - .read_time = s3c2410_rtc_gettime, - .set_time = s3c2410_rtc_settime, - .read_alarm = s3c2410_rtc_getalarm, - .set_alarm = s3c2410_rtc_setalarm, - .proc = s3c2410_rtc_proc, -}; - -static void s3c2410_rtc_enable(struct platform_device *pdev, int en) -{ - unsigned int tmp; - - if (s3c2410_rtc_base == NULL) - return; - - if (!en) { - tmp = readb(S3C2410_RTCCON); - writeb(tmp & ~S3C2410_RTCCON_RTCEN, S3C2410_RTCCON); - - tmp = readb(S3C2410_TICNT); - writeb(tmp & ~S3C2410_TICNT_ENABLE, S3C2410_TICNT); - } else { - /* re-enable the device, and check it is ok */ - - if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){ - dev_info(&pdev->dev, "rtc disabled, re-enabling\n"); - - tmp = readb(S3C2410_RTCCON); - writeb(tmp | S3C2410_RTCCON_RTCEN , S3C2410_RTCCON); - } - - if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){ - dev_info(&pdev->dev, "removing S3C2410_RTCCON_CNTSEL\n"); - - tmp = readb(S3C2410_RTCCON); - writeb(tmp& ~S3C2410_RTCCON_CNTSEL , S3C2410_RTCCON); - } - - if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){ - dev_info(&pdev->dev, "removing S3C2410_RTCCON_CLKRST\n"); - - tmp = readb(S3C2410_RTCCON); - writeb(tmp & ~S3C2410_RTCCON_CLKRST, S3C2410_RTCCON); - } - } -} - -static int s3c2410_rtc_remove(struct platform_device *dev) -{ - unregister_rtc(&s3c2410_rtcops); - - s3c2410_rtc_setpie(0); - s3c2410_rtc_setaie(0); - - if (s3c2410_rtc_mem != NULL) { - pr_debug("s3c2410_rtc: releasing s3c2410_rtc_mem\n"); - iounmap(s3c2410_rtc_base); - release_resource(s3c2410_rtc_mem); - kfree(s3c2410_rtc_mem); - } - - return 0; -} - -static int s3c2410_rtc_probe(struct platform_device *pdev) -{ - struct resource *res; - int ret; - - pr_debug("%s: probe=%p\n", __FUNCTION__, pdev); - - /* find the IRQs */ - - s3c2410_rtc_tickno = platform_get_irq(pdev, 1); - if (s3c2410_rtc_tickno < 0) { - dev_err(&pdev->dev, "no irq for rtc tick\n"); - return -ENOENT; - } - - s3c2410_rtc_alarmno = platform_get_irq(pdev, 0); - if (s3c2410_rtc_alarmno < 0) { - dev_err(&pdev->dev, "no irq for alarm\n"); - return -ENOENT; - } - - pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n", - s3c2410_rtc_tickno, s3c2410_rtc_alarmno); - - /* get the memory region */ - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res == NULL) { - dev_err(&pdev->dev, "failed to get memory region resource\n"); - return -ENOENT; - } - - s3c2410_rtc_mem = request_mem_region(res->start, res->end-res->start+1, - pdev->name); - - if (s3c2410_rtc_mem == NULL) { - dev_err(&pdev->dev, "failed to reserve memory region\n"); - ret = -ENOENT; - goto exit_err; - } - - s3c2410_rtc_base = ioremap(res->start, res->end - res->start + 1); - if (s3c2410_rtc_base == NULL) { - dev_err(&pdev->dev, "failed ioremap()\n"); - ret = -EINVAL; - goto exit_err; - } - - s3c2410_rtc_mem = res; - pr_debug("s3c2410_rtc_base=%p\n", s3c2410_rtc_base); - - pr_debug("s3c2410_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON)); - - /* check to see if everything is setup correctly */ - - s3c2410_rtc_enable(pdev, 1); - - pr_debug("s3c2410_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON)); - - s3c2410_rtc_setfreq(s3c2410_rtc_freq); - - /* register RTC and exit */ - - register_rtc(&s3c2410_rtcops); - return 0; - - exit_err: - dev_err(&pdev->dev, "error %d during initialisation\n", ret); - - return ret; -} - -#ifdef CONFIG_PM - -/* S3C2410 RTC Power management control */ - -static struct timespec s3c2410_rtc_delta; - -static int ticnt_save; - -static int s3c2410_rtc_suspend(struct platform_device *pdev, pm_message_t state) -{ - struct rtc_time tm; - struct timespec time; - - time.tv_nsec = 0; - - /* save TICNT for anyone using periodic interrupts */ - - ticnt_save = readb(S3C2410_TICNT); - - /* calculate time delta for suspend */ - - s3c2410_rtc_gettime(&tm); - rtc_tm_to_time(&tm, &time.tv_sec); - save_time_delta(&s3c2410_rtc_delta, &time); - s3c2410_rtc_enable(pdev, 0); - - return 0; -} - -static int s3c2410_rtc_resume(struct platform_device *pdev) -{ - struct rtc_time tm; - struct timespec time; - - time.tv_nsec = 0; - - s3c2410_rtc_enable(pdev, 1); - s3c2410_rtc_gettime(&tm); - rtc_tm_to_time(&tm, &time.tv_sec); - restore_time_delta(&s3c2410_rtc_delta, &time); - - writeb(ticnt_save, S3C2410_TICNT); - return 0; -} -#else -#define s3c2410_rtc_suspend NULL -#define s3c2410_rtc_resume NULL -#endif - -static struct platform_driver s3c2410_rtcdrv = { - .probe = s3c2410_rtc_probe, - .remove = s3c2410_rtc_remove, - .suspend = s3c2410_rtc_suspend, - .resume = s3c2410_rtc_resume, - .driver = { - .name = "s3c2410-rtc", - .owner = THIS_MODULE, - }, -}; - -static char __initdata banner[] = "S3C2410 RTC, (c) 2004 Simtec Electronics\n"; - -static int __init s3c2410_rtc_init(void) -{ - printk(banner); - return platform_driver_register(&s3c2410_rtcdrv); -} - -static void __exit s3c2410_rtc_exit(void) -{ - platform_driver_unregister(&s3c2410_rtcdrv); -} - -module_init(s3c2410_rtc_init); -module_exit(s3c2410_rtc_exit); - -MODULE_DESCRIPTION("S3C24XX RTC Driver"); -MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); -MODULE_LICENSE("GPL"); |