rtc: add support for spear rtc
Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com> Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rajeev Kumar
Linus Torvalds
Родитель
c258f9a0aa
Коммит
0942a71e43
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@ -682,6 +682,14 @@ config RTC_DRV_WM8350
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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-wm8350".
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config RTC_DRV_SPEAR
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tristate "SPEAR ST RTC"
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depends on PLAT_SPEAR
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default y
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help
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If you say Y here you will get support for the RTC found on
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spear
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config RTC_DRV_PCF50633
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depends on MFD_PCF50633
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tristate "NXP PCF50633 RTC"
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@ -91,6 +91,7 @@ obj-$(CONFIG_RTC_DRV_S35390A) += rtc-s35390a.o
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obj-$(CONFIG_RTC_DRV_S3C) += rtc-s3c.o
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obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o
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obj-$(CONFIG_RTC_DRV_SH) += rtc-sh.o
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obj-$(CONFIG_RTC_DRV_SPEAR) += rtc-spear.o
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obj-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o
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obj-$(CONFIG_RTC_DRV_STK17TA8) += rtc-stk17ta8.o
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obj-$(CONFIG_RTC_DRV_STMP) += rtc-stmp3xxx.o
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@ -0,0 +1,534 @@
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/*
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* drivers/rtc/rtc-spear.c
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*
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* Copyright (C) 2010 ST Microelectronics
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* Rajeev Kumar<rajeev-dlh.kumar@st.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/bcd.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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/* RTC registers */
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#define TIME_REG 0x00
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#define DATE_REG 0x04
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#define ALARM_TIME_REG 0x08
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#define ALARM_DATE_REG 0x0C
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#define CTRL_REG 0x10
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#define STATUS_REG 0x14
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/* TIME_REG & ALARM_TIME_REG */
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#define SECONDS_UNITS (0xf<<0) /* seconds units position */
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#define SECONDS_TENS (0x7<<4) /* seconds tens position */
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#define MINUTES_UNITS (0xf<<8) /* minutes units position */
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#define MINUTES_TENS (0x7<<12) /* minutes tens position */
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#define HOURS_UNITS (0xf<<16) /* hours units position */
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#define HOURS_TENS (0x3<<20) /* hours tens position */
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/* DATE_REG & ALARM_DATE_REG */
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#define DAYS_UNITS (0xf<<0) /* days units position */
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#define DAYS_TENS (0x3<<4) /* days tens position */
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#define MONTHS_UNITS (0xf<<8) /* months units position */
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#define MONTHS_TENS (0x1<<12) /* months tens position */
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#define YEARS_UNITS (0xf<<16) /* years units position */
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#define YEARS_TENS (0xf<<20) /* years tens position */
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#define YEARS_HUNDREDS (0xf<<24) /* years hundereds position */
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#define YEARS_MILLENIUMS (0xf<<28) /* years millenium position */
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/* MASK SHIFT TIME_REG & ALARM_TIME_REG*/
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#define SECOND_SHIFT 0x00 /* seconds units */
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#define MINUTE_SHIFT 0x08 /* minutes units position */
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#define HOUR_SHIFT 0x10 /* hours units position */
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#define MDAY_SHIFT 0x00 /* Month day shift */
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#define MONTH_SHIFT 0x08 /* Month shift */
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#define YEAR_SHIFT 0x10 /* Year shift */
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#define SECOND_MASK 0x7F
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#define MIN_MASK 0x7F
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#define HOUR_MASK 0x3F
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#define DAY_MASK 0x3F
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#define MONTH_MASK 0x7F
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#define YEAR_MASK 0xFFFF
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/* date reg equal to time reg, for debug only */
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#define TIME_BYP (1<<9)
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#define INT_ENABLE (1<<31) /* interrupt enable */
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/* STATUS_REG */
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#define CLK_UNCONNECTED (1<<0)
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#define PEND_WR_TIME (1<<2)
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#define PEND_WR_DATE (1<<3)
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#define LOST_WR_TIME (1<<4)
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#define LOST_WR_DATE (1<<5)
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#define RTC_INT_MASK (1<<31)
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#define STATUS_BUSY (PEND_WR_TIME | PEND_WR_DATE)
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#define STATUS_FAIL (LOST_WR_TIME | LOST_WR_DATE)
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struct spear_rtc_config {
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struct clk *clk;
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spinlock_t lock;
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void __iomem *ioaddr;
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};
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static inline void spear_rtc_clear_interrupt(struct spear_rtc_config *config)
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{
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unsigned int val;
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unsigned long flags;
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spin_lock_irqsave(&config->lock, flags);
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val = readl(config->ioaddr + STATUS_REG);
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val |= RTC_INT_MASK;
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writel(val, config->ioaddr + STATUS_REG);
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spin_unlock_irqrestore(&config->lock, flags);
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}
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static inline void spear_rtc_enable_interrupt(struct spear_rtc_config *config)
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{
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unsigned int val;
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val = readl(config->ioaddr + CTRL_REG);
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if (!(val & INT_ENABLE)) {
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spear_rtc_clear_interrupt(config);
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val |= INT_ENABLE;
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writel(val, config->ioaddr + CTRL_REG);
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}
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}
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static inline void spear_rtc_disable_interrupt(struct spear_rtc_config *config)
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{
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unsigned int val;
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val = readl(config->ioaddr + CTRL_REG);
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if (val & INT_ENABLE) {
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val &= ~INT_ENABLE;
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writel(val, config->ioaddr + CTRL_REG);
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}
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}
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static inline int is_write_complete(struct spear_rtc_config *config)
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{
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int ret = 0;
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unsigned long flags;
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spin_lock_irqsave(&config->lock, flags);
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if ((readl(config->ioaddr + STATUS_REG)) & STATUS_FAIL)
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ret = -EIO;
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spin_unlock_irqrestore(&config->lock, flags);
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return ret;
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}
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static void rtc_wait_not_busy(struct spear_rtc_config *config)
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{
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int status, count = 0;
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unsigned long flags;
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/* Assuming BUSY may stay active for 80 msec) */
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for (count = 0; count < 80; count++) {
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spin_lock_irqsave(&config->lock, flags);
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status = readl(config->ioaddr + STATUS_REG);
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spin_unlock_irqrestore(&config->lock, flags);
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if ((status & STATUS_BUSY) == 0)
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break;
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/* check status busy, after each msec */
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msleep(1);
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}
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}
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static irqreturn_t spear_rtc_irq(int irq, void *dev_id)
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{
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struct rtc_device *rtc = (struct rtc_device *)dev_id;
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struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
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unsigned long flags, events = 0;
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unsigned int irq_data;
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spin_lock_irqsave(&config->lock, flags);
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irq_data = readl(config->ioaddr + STATUS_REG);
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spin_unlock_irqrestore(&config->lock, flags);
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if ((irq_data & RTC_INT_MASK)) {
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spear_rtc_clear_interrupt(config);
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events = RTC_IRQF | RTC_AF;
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rtc_update_irq(rtc, 1, events);
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return IRQ_HANDLED;
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} else
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return IRQ_NONE;
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}
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static int tm2bcd(struct rtc_time *tm)
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{
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if (rtc_valid_tm(tm) != 0)
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return -EINVAL;
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tm->tm_sec = bin2bcd(tm->tm_sec);
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tm->tm_min = bin2bcd(tm->tm_min);
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tm->tm_hour = bin2bcd(tm->tm_hour);
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tm->tm_mday = bin2bcd(tm->tm_mday);
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tm->tm_mon = bin2bcd(tm->tm_mon + 1);
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tm->tm_year = bin2bcd(tm->tm_year);
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return 0;
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}
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static void bcd2tm(struct rtc_time *tm)
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{
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tm->tm_sec = bcd2bin(tm->tm_sec);
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tm->tm_min = bcd2bin(tm->tm_min);
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tm->tm_hour = bcd2bin(tm->tm_hour);
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tm->tm_mday = bcd2bin(tm->tm_mday);
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tm->tm_mon = bcd2bin(tm->tm_mon) - 1;
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/* epoch == 1900 */
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tm->tm_year = bcd2bin(tm->tm_year);
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}
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/*
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* spear_rtc_read_time - set the time
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* @dev: rtc device in use
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* @tm: holds date and time
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*
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* This function read time and date. On success it will return 0
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* otherwise -ve error is returned.
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*/
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static int spear_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct rtc_device *rtc = platform_get_drvdata(pdev);
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struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
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unsigned int time, date;
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/* we don't report wday/yday/isdst ... */
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rtc_wait_not_busy(config);
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time = readl(config->ioaddr + TIME_REG);
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date = readl(config->ioaddr + DATE_REG);
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tm->tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
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tm->tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
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tm->tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
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tm->tm_mday = (date >> MDAY_SHIFT) & DAY_MASK;
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tm->tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK;
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tm->tm_year = (date >> YEAR_SHIFT) & YEAR_MASK;
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bcd2tm(tm);
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return 0;
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}
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/*
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* spear_rtc_set_time - set the time
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* @dev: rtc device in use
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* @tm: holds date and time
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*
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* This function set time and date. On success it will return 0
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* otherwise -ve error is returned.
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*/
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static int spear_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct rtc_device *rtc = platform_get_drvdata(pdev);
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struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
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unsigned int time, date, err = 0;
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if (tm2bcd(tm) < 0)
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return -EINVAL;
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rtc_wait_not_busy(config);
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time = (tm->tm_sec << SECOND_SHIFT) | (tm->tm_min << MINUTE_SHIFT) |
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(tm->tm_hour << HOUR_SHIFT);
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date = (tm->tm_mday << MDAY_SHIFT) | (tm->tm_mon << MONTH_SHIFT) |
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(tm->tm_year << YEAR_SHIFT);
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writel(time, config->ioaddr + TIME_REG);
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writel(date, config->ioaddr + DATE_REG);
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err = is_write_complete(config);
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if (err < 0)
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return err;
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return 0;
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}
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/*
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* spear_rtc_read_alarm - read the alarm time
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* @dev: rtc device in use
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* @alm: holds alarm date and time
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*
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* This function read alarm time and date. On success it will return 0
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* otherwise -ve error is returned.
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*/
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static int spear_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct rtc_device *rtc = platform_get_drvdata(pdev);
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struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
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unsigned int time, date;
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rtc_wait_not_busy(config);
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time = readl(config->ioaddr + ALARM_TIME_REG);
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date = readl(config->ioaddr + ALARM_DATE_REG);
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alm->time.tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
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alm->time.tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
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alm->time.tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
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alm->time.tm_mday = (date >> MDAY_SHIFT) & DAY_MASK;
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alm->time.tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK;
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alm->time.tm_year = (date >> YEAR_SHIFT) & YEAR_MASK;
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bcd2tm(&alm->time);
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alm->enabled = readl(config->ioaddr + CTRL_REG) & INT_ENABLE;
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return 0;
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}
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/*
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* spear_rtc_set_alarm - set the alarm time
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* @dev: rtc device in use
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* @alm: holds alarm date and time
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*
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* This function set alarm time and date. On success it will return 0
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* otherwise -ve error is returned.
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*/
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static int spear_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct rtc_device *rtc = platform_get_drvdata(pdev);
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struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
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unsigned int time, date, err = 0;
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if (tm2bcd(&alm->time) < 0)
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return -EINVAL;
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rtc_wait_not_busy(config);
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time = (alm->time.tm_sec << SECOND_SHIFT) | (alm->time.tm_min <<
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MINUTE_SHIFT) | (alm->time.tm_hour << HOUR_SHIFT);
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date = (alm->time.tm_mday << MDAY_SHIFT) | (alm->time.tm_mon <<
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MONTH_SHIFT) | (alm->time.tm_year << YEAR_SHIFT);
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writel(time, config->ioaddr + ALARM_TIME_REG);
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writel(date, config->ioaddr + ALARM_DATE_REG);
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err = is_write_complete(config);
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if (err < 0)
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return err;
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if (alm->enabled)
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spear_rtc_enable_interrupt(config);
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else
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spear_rtc_disable_interrupt(config);
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return 0;
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}
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static struct rtc_class_ops spear_rtc_ops = {
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.read_time = spear_rtc_read_time,
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.set_time = spear_rtc_set_time,
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.read_alarm = spear_rtc_read_alarm,
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.set_alarm = spear_rtc_set_alarm,
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};
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static int __devinit spear_rtc_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct rtc_device *rtc;
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struct spear_rtc_config *config;
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unsigned int status = 0;
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int irq;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "no resource defined\n");
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return -EBUSY;
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}
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if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
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dev_err(&pdev->dev, "rtc region already claimed\n");
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return -EBUSY;
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}
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config = kzalloc(sizeof(*config), GFP_KERNEL);
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if (!config) {
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dev_err(&pdev->dev, "out of memory\n");
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status = -ENOMEM;
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goto err_release_region;
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}
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config->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(config->clk)) {
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status = PTR_ERR(config->clk);
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goto err_kfree;
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}
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status = clk_enable(config->clk);
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if (status < 0)
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goto err_clk_put;
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config->ioaddr = ioremap(res->start, resource_size(res));
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if (!config->ioaddr) {
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dev_err(&pdev->dev, "ioremap fail\n");
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status = -ENOMEM;
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goto err_disable_clock;
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}
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spin_lock_init(&config->lock);
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rtc = rtc_device_register(pdev->name, &pdev->dev, &spear_rtc_ops,
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THIS_MODULE);
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if (IS_ERR(rtc)) {
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dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
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PTR_ERR(rtc));
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status = PTR_ERR(rtc);
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goto err_iounmap;
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}
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platform_set_drvdata(pdev, rtc);
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dev_set_drvdata(&rtc->dev, config);
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/* alarm irqs */
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "no update irq?\n");
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status = irq;
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goto err_clear_platdata;
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}
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status = request_irq(irq, spear_rtc_irq, 0, pdev->name, rtc);
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if (status) {
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dev_err(&pdev->dev, "Alarm interrupt IRQ%d already \
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claimed\n", irq);
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goto err_clear_platdata;
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}
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if (!device_can_wakeup(&pdev->dev))
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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err_clear_platdata:
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platform_set_drvdata(pdev, NULL);
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dev_set_drvdata(&rtc->dev, NULL);
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rtc_device_unregister(rtc);
|
||||
err_iounmap:
|
||||
iounmap(config->ioaddr);
|
||||
err_disable_clock:
|
||||
clk_disable(config->clk);
|
||||
err_clk_put:
|
||||
clk_put(config->clk);
|
||||
err_kfree:
|
||||
kfree(config);
|
||||
err_release_region:
|
||||
release_mem_region(res->start, resource_size(res));
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
static int __devexit spear_rtc_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct rtc_device *rtc = platform_get_drvdata(pdev);
|
||||
struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
|
||||
int irq;
|
||||
struct resource *res;
|
||||
|
||||
/* leave rtc running, but disable irqs */
|
||||
spear_rtc_disable_interrupt(config);
|
||||
device_init_wakeup(&pdev->dev, 0);
|
||||
irq = platform_get_irq(pdev, 0);
|
||||
if (irq)
|
||||
free_irq(irq, pdev);
|
||||
clk_disable(config->clk);
|
||||
clk_put(config->clk);
|
||||
iounmap(config->ioaddr);
|
||||
kfree(config);
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (res)
|
||||
release_mem_region(res->start, resource_size(res));
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
dev_set_drvdata(&rtc->dev, NULL);
|
||||
rtc_device_unregister(rtc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
|
||||
static int spear_rtc_suspend(struct platform_device *pdev, pm_message_t state)
|
||||
{
|
||||
struct rtc_device *rtc = platform_get_drvdata(pdev);
|
||||
struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
|
||||
int irq;
|
||||
|
||||
irq = platform_get_irq(pdev, 0);
|
||||
if (device_may_wakeup(&pdev->dev))
|
||||
enable_irq_wake(irq);
|
||||
else {
|
||||
spear_rtc_disable_interrupt(config);
|
||||
clk_disable(config->clk);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int spear_rtc_resume(struct platform_device *pdev)
|
||||
{
|
||||
struct rtc_device *rtc = platform_get_drvdata(pdev);
|
||||
struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
|
||||
int irq;
|
||||
|
||||
irq = platform_get_irq(pdev, 0);
|
||||
|
||||
if (device_may_wakeup(&pdev->dev))
|
||||
disable_irq_wake(irq);
|
||||
else {
|
||||
clk_enable(config->clk);
|
||||
spear_rtc_enable_interrupt(config);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#else
|
||||
#define spear_rtc_suspend NULL
|
||||
#define spear_rtc_resume NULL
|
||||
#endif
|
||||
|
||||
static void spear_rtc_shutdown(struct platform_device *pdev)
|
||||
{
|
||||
struct rtc_device *rtc = platform_get_drvdata(pdev);
|
||||
struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
|
||||
|
||||
spear_rtc_disable_interrupt(config);
|
||||
clk_disable(config->clk);
|
||||
}
|
||||
|
||||
static struct platform_driver spear_rtc_driver = {
|
||||
.probe = spear_rtc_probe,
|
||||
.remove = __devexit_p(spear_rtc_remove),
|
||||
.suspend = spear_rtc_suspend,
|
||||
.resume = spear_rtc_resume,
|
||||
.shutdown = spear_rtc_shutdown,
|
||||
.driver = {
|
||||
.name = "rtc-spear",
|
||||
},
|
||||
};
|
||||
|
||||
static int __init rtc_init(void)
|
||||
{
|
||||
return platform_driver_register(&spear_rtc_driver);
|
||||
}
|
||||
module_init(rtc_init);
|
||||
|
||||
static void __exit rtc_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&spear_rtc_driver);
|
||||
}
|
||||
module_exit(rtc_exit);
|
||||
|
||||
MODULE_ALIAS("platform:rtc-spear");
|
||||
MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
|
||||
MODULE_DESCRIPTION("ST SPEAr Realtime Clock Driver (RTC)");
|
||||
MODULE_LICENSE("GPL");
|
||||
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