[PATCH] RTC: class driver for Samsung S3C series SoC
This is a renamed and tested version of the previous S3C24XX RTC class driver. The driver has been renamed from the original s3c2410-rtc, which is now too narrow for the range of devices supported. The rtc-s3c has been chosen as there is the distinct possibility of this driver being carried forward into newer Samsung SoC silicon. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ben Dooks
Linus Torvalds
parent
fa79837d5b
commit
1add6781c8
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@ -182,6 +182,22 @@ config RTC_DRV_RS5C372
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This driver can also be built as a module. If so, the module
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will be called rtc-rs5c372.
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config RTC_DRV_S3C
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tristate "Samsung S3C series SoC RTC"
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depends on RTC_CLASS && ARCH_S3C2410
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help
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RTC (Realtime Clock) driver for the clock inbuilt into the
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Samsung S3C24XX series of SoCs. This can provide periodic
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interrupt rates from 1Hz to 64Hz for user programs, and
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wakeup from Alarm.
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The driver currently supports the common features on all the
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S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
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and S3C2442.
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This driver can also be build as a module. If so, the module
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will be called rtc-s3c.
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config RTC_DRV_M48T86
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tristate "ST M48T86/Dallas DS12887"
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depends on RTC_CLASS
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@ -19,6 +19,7 @@ obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o
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obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
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obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o
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obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
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obj-$(CONFIG_RTC_DRV_S3C) += rtc-s3c.o
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obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
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obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
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obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o
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@ -0,0 +1,607 @@
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/* drivers/rtc/rtc-s3c.c
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*
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* Copyright (c) 2004,2006 Simtec Electronics
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* Ben Dooks, <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* S3C2410/S3C2440/S3C24XX Internal RTC Driver
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/clk.h>
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#include <asm/hardware.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/rtc.h>
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#include <asm/mach/time.h>
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#include <asm/arch/regs-rtc.h>
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/* I have yet to find an S3C implementation with more than one
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* of these rtc blocks in */
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static struct resource *s3c_rtc_mem;
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static void __iomem *s3c_rtc_base;
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static int s3c_rtc_alarmno = NO_IRQ;
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static int s3c_rtc_tickno = NO_IRQ;
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static int s3c_rtc_freq = 1;
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static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
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static unsigned int tick_count;
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/* IRQ Handlers */
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static irqreturn_t s3c_rtc_alarmirq(int irq, void *id, struct pt_regs *r)
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{
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struct rtc_device *rdev = id;
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rtc_update_irq(&rdev->class_dev, 1, RTC_AF | RTC_IRQF);
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return IRQ_HANDLED;
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}
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static irqreturn_t s3c_rtc_tickirq(int irq, void *id, struct pt_regs *r)
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{
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struct rtc_device *rdev = id;
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rtc_update_irq(&rdev->class_dev, tick_count++, RTC_PF | RTC_IRQF);
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return IRQ_HANDLED;
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}
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/* Update control registers */
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static void s3c_rtc_setaie(int to)
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{
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unsigned int tmp;
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pr_debug("%s: aie=%d\n", __FUNCTION__, to);
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tmp = readb(S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
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if (to)
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tmp |= S3C2410_RTCALM_ALMEN;
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writeb(tmp, S3C2410_RTCALM);
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}
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static void s3c_rtc_setpie(int to)
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{
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unsigned int tmp;
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pr_debug("%s: pie=%d\n", __FUNCTION__, to);
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spin_lock_irq(&s3c_rtc_pie_lock);
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tmp = readb(S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
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if (to)
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tmp |= S3C2410_TICNT_ENABLE;
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writeb(tmp, S3C2410_TICNT);
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spin_unlock_irq(&s3c_rtc_pie_lock);
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}
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static void s3c_rtc_setfreq(int freq)
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{
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unsigned int tmp;
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spin_lock_irq(&s3c_rtc_pie_lock);
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tmp = readb(S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
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s3c_rtc_freq = freq;
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tmp |= (128 / freq)-1;
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writeb(tmp, S3C2410_TICNT);
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spin_unlock_irq(&s3c_rtc_pie_lock);
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}
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/* Time read/write */
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static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
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{
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unsigned int have_retried = 0;
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retry_get_time:
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rtc_tm->tm_min = readb(S3C2410_RTCMIN);
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rtc_tm->tm_hour = readb(S3C2410_RTCHOUR);
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rtc_tm->tm_mday = readb(S3C2410_RTCDATE);
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rtc_tm->tm_mon = readb(S3C2410_RTCMON);
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rtc_tm->tm_year = readb(S3C2410_RTCYEAR);
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rtc_tm->tm_sec = readb(S3C2410_RTCSEC);
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/* the only way to work out wether the system was mid-update
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* when we read it is to check the second counter, and if it
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* is zero, then we re-try the entire read
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*/
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if (rtc_tm->tm_sec == 0 && !have_retried) {
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have_retried = 1;
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goto retry_get_time;
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}
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pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
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rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
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rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
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BCD_TO_BIN(rtc_tm->tm_sec);
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BCD_TO_BIN(rtc_tm->tm_min);
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BCD_TO_BIN(rtc_tm->tm_hour);
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BCD_TO_BIN(rtc_tm->tm_mday);
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BCD_TO_BIN(rtc_tm->tm_mon);
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BCD_TO_BIN(rtc_tm->tm_year);
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rtc_tm->tm_year += 100;
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rtc_tm->tm_mon -= 1;
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return 0;
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}
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static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
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{
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/* the rtc gets round the y2k problem by just not supporting it */
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if (tm->tm_year < 100)
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return -EINVAL;
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writeb(BIN2BCD(tm->tm_sec), S3C2410_RTCSEC);
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writeb(BIN2BCD(tm->tm_min), S3C2410_RTCMIN);
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writeb(BIN2BCD(tm->tm_hour), S3C2410_RTCHOUR);
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writeb(BIN2BCD(tm->tm_mday), S3C2410_RTCDATE);
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writeb(BIN2BCD(tm->tm_mon + 1), S3C2410_RTCMON);
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writeb(BIN2BCD(tm->tm_year - 100), S3C2410_RTCYEAR);
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return 0;
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}
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static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rtc_time *alm_tm = &alrm->time;
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unsigned int alm_en;
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alm_tm->tm_sec = readb(S3C2410_ALMSEC);
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alm_tm->tm_min = readb(S3C2410_ALMMIN);
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alm_tm->tm_hour = readb(S3C2410_ALMHOUR);
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alm_tm->tm_mon = readb(S3C2410_ALMMON);
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alm_tm->tm_mday = readb(S3C2410_ALMDATE);
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alm_tm->tm_year = readb(S3C2410_ALMYEAR);
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alm_en = readb(S3C2410_RTCALM);
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pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
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alm_en,
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alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
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alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
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/* decode the alarm enable field */
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if (alm_en & S3C2410_RTCALM_SECEN)
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BCD_TO_BIN(alm_tm->tm_sec);
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else
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alm_tm->tm_sec = 0xff;
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if (alm_en & S3C2410_RTCALM_MINEN)
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BCD_TO_BIN(alm_tm->tm_min);
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else
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alm_tm->tm_min = 0xff;
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if (alm_en & S3C2410_RTCALM_HOUREN)
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BCD_TO_BIN(alm_tm->tm_hour);
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else
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alm_tm->tm_hour = 0xff;
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if (alm_en & S3C2410_RTCALM_DAYEN)
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BCD_TO_BIN(alm_tm->tm_mday);
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else
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alm_tm->tm_mday = 0xff;
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if (alm_en & S3C2410_RTCALM_MONEN) {
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BCD_TO_BIN(alm_tm->tm_mon);
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alm_tm->tm_mon -= 1;
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} else {
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alm_tm->tm_mon = 0xff;
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}
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if (alm_en & S3C2410_RTCALM_YEAREN)
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BCD_TO_BIN(alm_tm->tm_year);
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else
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alm_tm->tm_year = 0xffff;
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return 0;
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}
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static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rtc_time *tm = &alrm->time;
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unsigned int alrm_en;
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pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
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alrm->enabled,
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tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
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tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
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alrm_en = readb(S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
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writeb(0x00, S3C2410_RTCALM);
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if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
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alrm_en |= S3C2410_RTCALM_SECEN;
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writeb(BIN2BCD(tm->tm_sec), S3C2410_ALMSEC);
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}
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if (tm->tm_min < 60 && tm->tm_min >= 0) {
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alrm_en |= S3C2410_RTCALM_MINEN;
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writeb(BIN2BCD(tm->tm_min), S3C2410_ALMMIN);
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}
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if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
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alrm_en |= S3C2410_RTCALM_HOUREN;
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writeb(BIN2BCD(tm->tm_hour), S3C2410_ALMHOUR);
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}
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pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
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writeb(alrm_en, S3C2410_RTCALM);
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if (0) {
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alrm_en = readb(S3C2410_RTCALM);
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alrm_en &= ~S3C2410_RTCALM_ALMEN;
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writeb(alrm_en, S3C2410_RTCALM);
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disable_irq_wake(s3c_rtc_alarmno);
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}
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if (alrm->enabled)
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enable_irq_wake(s3c_rtc_alarmno);
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else
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disable_irq_wake(s3c_rtc_alarmno);
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return 0;
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}
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static int s3c_rtc_ioctl(struct device *dev,
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unsigned int cmd, unsigned long arg)
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{
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unsigned int ret = -ENOIOCTLCMD;
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switch (cmd) {
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case RTC_AIE_OFF:
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case RTC_AIE_ON:
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s3c_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0);
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ret = 0;
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break;
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case RTC_PIE_OFF:
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case RTC_PIE_ON:
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tick_count = 0;
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s3c_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0);
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ret = 0;
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break;
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case RTC_IRQP_READ:
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ret = put_user(s3c_rtc_freq, (unsigned long __user *)arg);
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break;
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case RTC_IRQP_SET:
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/* check for power of 2 */
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if ((arg & (arg-1)) != 0 || arg < 1) {
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ret = -EINVAL;
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goto exit;
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}
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pr_debug("s3c2410_rtc: setting frequency %ld\n", arg);
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s3c_rtc_setfreq(arg);
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ret = 0;
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break;
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case RTC_UIE_ON:
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case RTC_UIE_OFF:
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ret = -EINVAL;
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}
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exit:
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return ret;
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}
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static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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unsigned int rtcalm = readb(S3C2410_RTCALM);
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unsigned int ticnt = readb (S3C2410_TICNT);
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seq_printf(seq, "alarm_IRQ\t: %s\n",
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(rtcalm & S3C2410_RTCALM_ALMEN) ? "yes" : "no" );
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seq_printf(seq, "periodic_IRQ\t: %s\n",
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(ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
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seq_printf(seq, "periodic_freq\t: %d\n", s3c_rtc_freq);
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return 0;
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}
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static int s3c_rtc_open(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
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int ret;
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ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
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SA_INTERRUPT, "s3c2410-rtc alarm", rtc_dev);
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if (ret) {
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dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
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return ret;
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}
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ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
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SA_INTERRUPT, "s3c2410-rtc tick", rtc_dev);
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if (ret) {
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dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
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goto tick_err;
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}
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return ret;
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tick_err:
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free_irq(s3c_rtc_alarmno, rtc_dev);
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return ret;
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}
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static void s3c_rtc_release(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
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/* do not clear AIE here, it may be needed for wake */
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s3c_rtc_setpie(0);
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free_irq(s3c_rtc_alarmno, rtc_dev);
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free_irq(s3c_rtc_tickno, rtc_dev);
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}
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static struct rtc_class_ops s3c_rtcops = {
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.open = s3c_rtc_open,
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.release = s3c_rtc_release,
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.ioctl = s3c_rtc_ioctl,
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.read_time = s3c_rtc_gettime,
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.set_time = s3c_rtc_settime,
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.read_alarm = s3c_rtc_getalarm,
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.set_alarm = s3c_rtc_setalarm,
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.proc = s3c_rtc_proc,
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};
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static void s3c_rtc_enable(struct platform_device *pdev, int en)
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{
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unsigned int tmp;
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if (s3c_rtc_base == NULL)
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return;
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if (!en) {
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tmp = readb(S3C2410_RTCCON);
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writeb(tmp & ~S3C2410_RTCCON_RTCEN, S3C2410_RTCCON);
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tmp = readb(S3C2410_TICNT);
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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 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 RTCCON_CLKRST\n");
|
||||
|
||||
tmp = readb(S3C2410_RTCCON);
|
||||
writeb(tmp & ~S3C2410_RTCCON_CLKRST, S3C2410_RTCCON);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static int s3c_rtc_remove(struct platform_device *dev)
|
||||
{
|
||||
struct rtc_device *rtc = platform_get_drvdata(dev);
|
||||
|
||||
platform_set_drvdata(dev, NULL);
|
||||
rtc_device_unregister(rtc);
|
||||
|
||||
s3c_rtc_setpie(0);
|
||||
s3c_rtc_setaie(0);
|
||||
|
||||
iounmap(s3c_rtc_base);
|
||||
release_resource(s3c_rtc_mem);
|
||||
kfree(s3c_rtc_mem);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int s3c_rtc_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct rtc_device *rtc;
|
||||
struct resource *res;
|
||||
int ret;
|
||||
|
||||
pr_debug("%s: probe=%p\n", __FUNCTION__, pdev);
|
||||
|
||||
/* find the IRQs */
|
||||
|
||||
s3c_rtc_tickno = platform_get_irq(pdev, 1);
|
||||
if (s3c_rtc_tickno < 0) {
|
||||
dev_err(&pdev->dev, "no irq for rtc tick\n");
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
s3c_rtc_alarmno = platform_get_irq(pdev, 0);
|
||||
if (s3c_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",
|
||||
s3c_rtc_tickno, s3c_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;
|
||||
}
|
||||
|
||||
s3c_rtc_mem = request_mem_region(res->start,
|
||||
res->end-res->start+1,
|
||||
pdev->name);
|
||||
|
||||
if (s3c_rtc_mem == NULL) {
|
||||
dev_err(&pdev->dev, "failed to reserve memory region\n");
|
||||
ret = -ENOENT;
|
||||
goto err_nores;
|
||||
}
|
||||
|
||||
s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
|
||||
if (s3c_rtc_base == NULL) {
|
||||
dev_err(&pdev->dev, "failed ioremap()\n");
|
||||
ret = -EINVAL;
|
||||
goto err_nomap;
|
||||
}
|
||||
|
||||
/* check to see if everything is setup correctly */
|
||||
|
||||
s3c_rtc_enable(pdev, 1);
|
||||
|
||||
pr_debug("s3c2410_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON));
|
||||
|
||||
s3c_rtc_setfreq(s3c_rtc_freq);
|
||||
|
||||
/* register RTC and exit */
|
||||
|
||||
rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
|
||||
THIS_MODULE);
|
||||
|
||||
if (IS_ERR(rtc)) {
|
||||
dev_err(&pdev->dev, "cannot attach rtc\n");
|
||||
ret = PTR_ERR(rtc);
|
||||
goto err_nortc;
|
||||
}
|
||||
|
||||
rtc->max_user_freq = 128;
|
||||
|
||||
platform_set_drvdata(pdev, rtc);
|
||||
return 0;
|
||||
|
||||
err_nortc:
|
||||
s3c_rtc_enable(pdev, 0);
|
||||
iounmap(s3c_rtc_base);
|
||||
|
||||
err_nomap:
|
||||
release_resource(s3c_rtc_mem);
|
||||
|
||||
err_nores:
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
|
||||
/* RTC Power management control */
|
||||
|
||||
static struct timespec s3c_rtc_delta;
|
||||
|
||||
static int ticnt_save;
|
||||
|
||||
static int s3c_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 */
|
||||
|
||||
s3c_rtc_gettime(&pdev->dev, &tm);
|
||||
rtc_tm_to_time(&tm, &time.tv_sec);
|
||||
save_time_delta(&s3c_rtc_delta, &time);
|
||||
s3c_rtc_enable(pdev, 0);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int s3c_rtc_resume(struct platform_device *pdev)
|
||||
{
|
||||
struct rtc_time tm;
|
||||
struct timespec time;
|
||||
|
||||
time.tv_nsec = 0;
|
||||
|
||||
s3c_rtc_enable(pdev, 1);
|
||||
s3c_rtc_gettime(&pdev->dev, &tm);
|
||||
rtc_tm_to_time(&tm, &time.tv_sec);
|
||||
restore_time_delta(&s3c_rtc_delta, &time);
|
||||
|
||||
writeb(ticnt_save, S3C2410_TICNT);
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
#define s3c_rtc_suspend NULL
|
||||
#define s3c_rtc_resume NULL
|
||||
#endif
|
||||
|
||||
static struct platform_driver s3c2410_rtcdrv = {
|
||||
.probe = s3c_rtc_probe,
|
||||
.remove = s3c_rtc_remove,
|
||||
.suspend = s3c_rtc_suspend,
|
||||
.resume = s3c_rtc_resume,
|
||||
.driver = {
|
||||
.name = "s3c2410-rtc",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
};
|
||||
|
||||
static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
|
||||
|
||||
static int __init s3c_rtc_init(void)
|
||||
{
|
||||
printk(banner);
|
||||
return platform_driver_register(&s3c2410_rtcdrv);
|
||||
}
|
||||
|
||||
static void __exit s3c_rtc_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&s3c2410_rtcdrv);
|
||||
}
|
||||
|
||||
module_init(s3c_rtc_init);
|
||||
module_exit(s3c_rtc_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Samsung S3C RTC Driver");
|
||||
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue