rtc: add support for the ST M48T59 RTC
[akpm@linux-foundation.org: x86_64 build fix] [akpm@linux-foundation.org: The acpi guys changed the bin_attribute code] Signed-off-by: Mark Zhan <rongkai.zhan@windriver.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:
Mark Zhan
Linus Torvalds
Родитель
617780d290
Коммит
2e774c7caf
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@ -310,6 +310,16 @@ config RTC_DRV_M48T86
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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-m48t86.
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config RTC_DRV_M48T59
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tristate "ST M48T59"
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depends on RTC_CLASS
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help
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If you say Y here you will get support for the
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ST M48T59 RTC chip.
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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-m48t59".
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config RTC_DRV_V3020
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tristate "EM Microelectronic V3020"
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depends on RTC_CLASS
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@ -43,3 +43,4 @@ obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o
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obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
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obj-$(CONFIG_RTC_DRV_SH) += rtc-sh.o
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obj-$(CONFIG_RTC_DRV_BFIN) += rtc-bfin.o
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obj-$(CONFIG_RTC_DRV_M48T59) += rtc-m48t59.o
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@ -0,0 +1,491 @@
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/*
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* ST M48T59 RTC driver
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*
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* Copyright (c) 2007 Wind River Systems, Inc.
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*
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* Author: Mark Zhan <rongkai.zhan@windriver.com>
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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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/rtc/m48t59.h>
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#include <linux/bcd.h>
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#ifndef NO_IRQ
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#define NO_IRQ (-1)
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#endif
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#define M48T59_READ(reg) pdata->read_byte(dev, reg)
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#define M48T59_WRITE(val, reg) pdata->write_byte(dev, reg, val)
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#define M48T59_SET_BITS(mask, reg) \
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M48T59_WRITE((M48T59_READ(reg) | (mask)), (reg))
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#define M48T59_CLEAR_BITS(mask, reg) \
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M48T59_WRITE((M48T59_READ(reg) & ~(mask)), (reg))
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struct m48t59_private {
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void __iomem *ioaddr;
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unsigned int size; /* iomem size */
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unsigned int irq;
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struct rtc_device *rtc;
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spinlock_t lock; /* serialize the NVRAM and RTC access */
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};
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/*
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* This is the generic access method when the chip is memory-mapped
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*/
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static void
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m48t59_mem_writeb(struct device *dev, u32 ofs, u8 val)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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writeb(val, m48t59->ioaddr+ofs);
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}
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static u8
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m48t59_mem_readb(struct device *dev, u32 ofs)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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return readb(m48t59->ioaddr+ofs);
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}
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/*
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* NOTE: M48T59 only uses BCD mode
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*/
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static int m48t59_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 m48t59_plat_data *pdata = pdev->dev.platform_data;
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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unsigned long flags;
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u8 val;
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spin_lock_irqsave(&m48t59->lock, flags);
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/* Issue the READ command */
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M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);
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tm->tm_year = BCD2BIN(M48T59_READ(M48T59_YEAR));
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/* tm_mon is 0-11 */
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tm->tm_mon = BCD2BIN(M48T59_READ(M48T59_MONTH)) - 1;
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tm->tm_mday = BCD2BIN(M48T59_READ(M48T59_MDAY));
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val = M48T59_READ(M48T59_WDAY);
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if ((val & M48T59_WDAY_CEB) && (val & M48T59_WDAY_CB)) {
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dev_dbg(dev, "Century bit is enabled\n");
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tm->tm_year += 100; /* one century */
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}
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tm->tm_wday = BCD2BIN(val & 0x07);
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tm->tm_hour = BCD2BIN(M48T59_READ(M48T59_HOUR) & 0x3F);
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tm->tm_min = BCD2BIN(M48T59_READ(M48T59_MIN) & 0x7F);
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tm->tm_sec = BCD2BIN(M48T59_READ(M48T59_SEC) & 0x7F);
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/* Clear the READ bit */
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M48T59_CLEAR_BITS(M48T59_CNTL_READ, M48T59_CNTL);
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spin_unlock_irqrestore(&m48t59->lock, flags);
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dev_dbg(dev, "RTC read time %04d-%02d-%02d %02d/%02d/%02d\n",
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tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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return 0;
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}
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static int m48t59_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 m48t59_plat_data *pdata = pdev->dev.platform_data;
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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unsigned long flags;
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u8 val = 0;
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dev_dbg(dev, "RTC set time %04d-%02d-%02d %02d/%02d/%02d\n",
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tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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spin_lock_irqsave(&m48t59->lock, flags);
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/* Issue the WRITE command */
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M48T59_SET_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
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M48T59_WRITE((BIN2BCD(tm->tm_sec) & 0x7F), M48T59_SEC);
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M48T59_WRITE((BIN2BCD(tm->tm_min) & 0x7F), M48T59_MIN);
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M48T59_WRITE((BIN2BCD(tm->tm_hour) & 0x3F), M48T59_HOUR);
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M48T59_WRITE((BIN2BCD(tm->tm_mday) & 0x3F), M48T59_MDAY);
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/* tm_mon is 0-11 */
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M48T59_WRITE((BIN2BCD(tm->tm_mon + 1) & 0x1F), M48T59_MONTH);
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M48T59_WRITE(BIN2BCD(tm->tm_year % 100), M48T59_YEAR);
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if (tm->tm_year/100)
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val = (M48T59_WDAY_CEB | M48T59_WDAY_CB);
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val |= (BIN2BCD(tm->tm_wday) & 0x07);
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M48T59_WRITE(val, M48T59_WDAY);
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/* Clear the WRITE bit */
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M48T59_CLEAR_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
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spin_unlock_irqrestore(&m48t59->lock, flags);
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return 0;
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}
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/*
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* Read alarm time and date in RTC
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*/
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static int m48t59_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct m48t59_plat_data *pdata = pdev->dev.platform_data;
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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struct rtc_time *tm = &alrm->time;
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unsigned long flags;
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u8 val;
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/* If no irq, we don't support ALARM */
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if (m48t59->irq == NO_IRQ)
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return -EIO;
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spin_lock_irqsave(&m48t59->lock, flags);
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/* Issue the READ command */
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M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);
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tm->tm_year = BCD2BIN(M48T59_READ(M48T59_YEAR));
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/* tm_mon is 0-11 */
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tm->tm_mon = BCD2BIN(M48T59_READ(M48T59_MONTH)) - 1;
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val = M48T59_READ(M48T59_WDAY);
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if ((val & M48T59_WDAY_CEB) && (val & M48T59_WDAY_CB))
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tm->tm_year += 100; /* one century */
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tm->tm_mday = BCD2BIN(M48T59_READ(M48T59_ALARM_DATE));
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tm->tm_hour = BCD2BIN(M48T59_READ(M48T59_ALARM_HOUR));
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tm->tm_min = BCD2BIN(M48T59_READ(M48T59_ALARM_MIN));
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tm->tm_sec = BCD2BIN(M48T59_READ(M48T59_ALARM_SEC));
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/* Clear the READ bit */
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M48T59_CLEAR_BITS(M48T59_CNTL_READ, M48T59_CNTL);
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spin_unlock_irqrestore(&m48t59->lock, flags);
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dev_dbg(dev, "RTC read alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
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tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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return 0;
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}
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/*
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* Set alarm time and date in RTC
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*/
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static int m48t59_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct m48t59_plat_data *pdata = pdev->dev.platform_data;
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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struct rtc_time *tm = &alrm->time;
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u8 mday, hour, min, sec;
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unsigned long flags;
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/* If no irq, we don't support ALARM */
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if (m48t59->irq == NO_IRQ)
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return -EIO;
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/*
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* 0xff means "always match"
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*/
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mday = tm->tm_mday;
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mday = (mday >= 1 && mday <= 31) ? BIN2BCD(mday) : 0xff;
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if (mday == 0xff)
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mday = M48T59_READ(M48T59_MDAY);
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hour = tm->tm_hour;
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hour = (hour < 24) ? BIN2BCD(hour) : 0x00;
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min = tm->tm_min;
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min = (min < 60) ? BIN2BCD(min) : 0x00;
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sec = tm->tm_sec;
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sec = (sec < 60) ? BIN2BCD(sec) : 0x00;
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spin_lock_irqsave(&m48t59->lock, flags);
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/* Issue the WRITE command */
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M48T59_SET_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
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M48T59_WRITE(mday, M48T59_ALARM_DATE);
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M48T59_WRITE(hour, M48T59_ALARM_HOUR);
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M48T59_WRITE(min, M48T59_ALARM_MIN);
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M48T59_WRITE(sec, M48T59_ALARM_SEC);
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/* Clear the WRITE bit */
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M48T59_CLEAR_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
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spin_unlock_irqrestore(&m48t59->lock, flags);
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dev_dbg(dev, "RTC set alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
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tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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return 0;
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}
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/*
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* Handle commands from user-space
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*/
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static int m48t59_rtc_ioctl(struct device *dev, unsigned int cmd,
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unsigned long arg)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct m48t59_plat_data *pdata = pdev->dev.platform_data;
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&m48t59->lock, flags);
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switch (cmd) {
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case RTC_AIE_OFF: /* alarm interrupt off */
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M48T59_WRITE(0x00, M48T59_INTR);
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break;
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case RTC_AIE_ON: /* alarm interrupt on */
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M48T59_WRITE(M48T59_INTR_AFE, M48T59_INTR);
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break;
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default:
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ret = -ENOIOCTLCMD;
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break;
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}
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spin_unlock_irqrestore(&m48t59->lock, flags);
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return ret;
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}
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static int m48t59_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct m48t59_plat_data *pdata = pdev->dev.platform_data;
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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unsigned long flags;
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u8 val;
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spin_lock_irqsave(&m48t59->lock, flags);
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val = M48T59_READ(M48T59_FLAGS);
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spin_unlock_irqrestore(&m48t59->lock, flags);
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seq_printf(seq, "battery\t\t: %s\n",
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(val & M48T59_FLAGS_BF) ? "low" : "normal");
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return 0;
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}
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/*
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* IRQ handler for the RTC
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*/
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static irqreturn_t m48t59_rtc_interrupt(int irq, void *dev_id)
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{
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struct device *dev = (struct device *)dev_id;
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struct platform_device *pdev = to_platform_device(dev);
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struct m48t59_plat_data *pdata = pdev->dev.platform_data;
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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u8 event;
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spin_lock(&m48t59->lock);
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event = M48T59_READ(M48T59_FLAGS);
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spin_unlock(&m48t59->lock);
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if (event & M48T59_FLAGS_AF) {
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rtc_update_irq(m48t59->rtc, 1, (RTC_AF | RTC_IRQF));
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static const struct rtc_class_ops m48t59_rtc_ops = {
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.ioctl = m48t59_rtc_ioctl,
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.read_time = m48t59_rtc_read_time,
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.set_time = m48t59_rtc_set_time,
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.read_alarm = m48t59_rtc_readalarm,
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.set_alarm = m48t59_rtc_setalarm,
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.proc = m48t59_rtc_proc,
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};
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static ssize_t m48t59_nvram_read(struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t size)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct platform_device *pdev = to_platform_device(dev);
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struct m48t59_plat_data *pdata = pdev->dev.platform_data;
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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ssize_t cnt = 0;
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unsigned long flags;
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for (; size > 0 && pos < M48T59_NVRAM_SIZE; cnt++, size--) {
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spin_lock_irqsave(&m48t59->lock, flags);
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*buf++ = M48T59_READ(cnt);
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spin_unlock_irqrestore(&m48t59->lock, flags);
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}
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return cnt;
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}
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static ssize_t m48t59_nvram_write(struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t size)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct platform_device *pdev = to_platform_device(dev);
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struct m48t59_plat_data *pdata = pdev->dev.platform_data;
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struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
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ssize_t cnt = 0;
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unsigned long flags;
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for (; size > 0 && pos < M48T59_NVRAM_SIZE; cnt++, size--) {
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spin_lock_irqsave(&m48t59->lock, flags);
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M48T59_WRITE(*buf++, cnt);
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spin_unlock_irqrestore(&m48t59->lock, flags);
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}
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return cnt;
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}
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static struct bin_attribute m48t59_nvram_attr = {
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.attr = {
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.name = "nvram",
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.mode = S_IRUGO | S_IWUGO,
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.owner = THIS_MODULE,
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},
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.read = m48t59_nvram_read,
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.write = m48t59_nvram_write,
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};
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static int __devinit m48t59_rtc_probe(struct platform_device *pdev)
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{
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struct m48t59_plat_data *pdata = pdev->dev.platform_data;
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struct m48t59_private *m48t59 = NULL;
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struct resource *res;
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int ret = -ENOMEM;
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/* This chip could be memory-mapped or I/O-mapped */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (!res)
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return -EINVAL;
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}
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if (res->flags & IORESOURCE_IO) {
|
||||
/* If we are I/O-mapped, the platform should provide
|
||||
* the operations accessing chip registers.
|
||||
*/
|
||||
if (!pdata || !pdata->write_byte || !pdata->read_byte)
|
||||
return -EINVAL;
|
||||
} else if (res->flags & IORESOURCE_MEM) {
|
||||
/* we are memory-mapped */
|
||||
if (!pdata) {
|
||||
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
|
||||
if (!pdata)
|
||||
return -ENOMEM;
|
||||
/* Ensure we only kmalloc platform data once */
|
||||
pdev->dev.platform_data = pdata;
|
||||
}
|
||||
|
||||
/* Try to use the generic memory read/write ops */
|
||||
if (!pdata->write_byte)
|
||||
pdata->write_byte = m48t59_mem_writeb;
|
||||
if (!pdata->read_byte)
|
||||
pdata->read_byte = m48t59_mem_readb;
|
||||
}
|
||||
|
||||
m48t59 = kzalloc(sizeof(*m48t59), GFP_KERNEL);
|
||||
if (!m48t59)
|
||||
return -ENOMEM;
|
||||
|
||||
m48t59->size = res->end - res->start + 1;
|
||||
m48t59->ioaddr = ioremap(res->start, m48t59->size);
|
||||
if (!m48t59->ioaddr)
|
||||
goto out;
|
||||
|
||||
/* Try to get irq number. We also can work in
|
||||
* the mode without IRQ.
|
||||
*/
|
||||
m48t59->irq = platform_get_irq(pdev, 0);
|
||||
if (m48t59->irq < 0)
|
||||
m48t59->irq = NO_IRQ;
|
||||
|
||||
if (m48t59->irq != NO_IRQ) {
|
||||
ret = request_irq(m48t59->irq, m48t59_rtc_interrupt,
|
||||
IRQF_SHARED, "rtc-m48t59", &pdev->dev);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
|
||||
m48t59->rtc = rtc_device_register("m48t59", &pdev->dev,
|
||||
&m48t59_rtc_ops, THIS_MODULE);
|
||||
if (IS_ERR(m48t59->rtc)) {
|
||||
ret = PTR_ERR(m48t59->rtc);
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = sysfs_create_bin_file(&pdev->dev.kobj, &m48t59_nvram_attr);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
spin_lock_init(&m48t59->lock);
|
||||
platform_set_drvdata(pdev, m48t59);
|
||||
return 0;
|
||||
|
||||
out:
|
||||
if (!IS_ERR(m48t59->rtc))
|
||||
rtc_device_unregister(m48t59->rtc);
|
||||
if (m48t59->irq != NO_IRQ)
|
||||
free_irq(m48t59->irq, &pdev->dev);
|
||||
if (m48t59->ioaddr)
|
||||
iounmap(m48t59->ioaddr);
|
||||
if (m48t59)
|
||||
kfree(m48t59);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit m48t59_rtc_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
||||
|
||||
sysfs_remove_bin_file(&pdev->dev.kobj, &m48t59_nvram_attr);
|
||||
if (!IS_ERR(m48t59->rtc))
|
||||
rtc_device_unregister(m48t59->rtc);
|
||||
if (m48t59->ioaddr)
|
||||
iounmap(m48t59->ioaddr);
|
||||
if (m48t59->irq != NO_IRQ)
|
||||
free_irq(m48t59->irq, &pdev->dev);
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
kfree(m48t59);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver m48t59_rtc_platdrv = {
|
||||
.driver = {
|
||||
.name = "rtc-m48t59",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = m48t59_rtc_probe,
|
||||
.remove = __devexit_p(m48t59_rtc_remove),
|
||||
};
|
||||
|
||||
static int __init m48t59_rtc_init(void)
|
||||
{
|
||||
return platform_driver_register(&m48t59_rtc_platdrv);
|
||||
}
|
||||
|
||||
static void __exit m48t59_rtc_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&m48t59_rtc_platdrv);
|
||||
}
|
||||
|
||||
module_init(m48t59_rtc_init);
|
||||
module_exit(m48t59_rtc_exit);
|
||||
|
||||
MODULE_AUTHOR("Mark Zhan <rongkai.zhan@windriver.com>");
|
||||
MODULE_DESCRIPTION("M48T59 RTC driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -0,0 +1,57 @@
|
|||
/*
|
||||
* include/linux/rtc/m48t59.h
|
||||
*
|
||||
* Definitions for the platform data of m48t59 RTC chip driver.
|
||||
*
|
||||
* Copyright (c) 2007 Wind River Systems, Inc.
|
||||
*
|
||||
* Mark Zhan <rongkai.zhan@windriver.com>
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef _LINUX_RTC_M48T59_H_
|
||||
#define _LINUX_RTC_M48T59_H_
|
||||
|
||||
/*
|
||||
* M48T59 Register Offset
|
||||
*/
|
||||
#define M48T59_YEAR 0x1fff
|
||||
#define M48T59_MONTH 0x1ffe
|
||||
#define M48T59_MDAY 0x1ffd /* Day of Month */
|
||||
#define M48T59_WDAY 0x1ffc /* Day of Week */
|
||||
#define M48T59_WDAY_CB 0x20 /* Century Bit */
|
||||
#define M48T59_WDAY_CEB 0x10 /* Century Enable Bit */
|
||||
#define M48T59_HOUR 0x1ffb
|
||||
#define M48T59_MIN 0x1ffa
|
||||
#define M48T59_SEC 0x1ff9
|
||||
#define M48T59_CNTL 0x1ff8
|
||||
#define M48T59_CNTL_READ 0x40
|
||||
#define M48T59_CNTL_WRITE 0x80
|
||||
#define M48T59_WATCHDOG 0x1ff7
|
||||
#define M48T59_INTR 0x1ff6
|
||||
#define M48T59_INTR_AFE 0x80 /* Alarm Interrupt Enable */
|
||||
#define M48T59_INTR_ABE 0x20
|
||||
#define M48T59_ALARM_DATE 0x1ff5
|
||||
#define M48T59_ALARM_HOUR 0x1ff4
|
||||
#define M48T59_ALARM_MIN 0x1ff3
|
||||
#define M48T59_ALARM_SEC 0x1ff2
|
||||
#define M48T59_UNUSED 0x1ff1
|
||||
#define M48T59_FLAGS 0x1ff0
|
||||
#define M48T59_FLAGS_WDT 0x80 /* watchdog timer expired */
|
||||
#define M48T59_FLAGS_AF 0x40 /* alarm */
|
||||
#define M48T59_FLAGS_BF 0x10 /* low battery */
|
||||
|
||||
#define M48T59_NVRAM_SIZE 0x1ff0
|
||||
|
||||
struct m48t59_plat_data {
|
||||
/* The method to access M48T59 registers,
|
||||
* NOTE: The 'ofs' should be 0x00~0x1fff
|
||||
*/
|
||||
void (*write_byte)(struct device *dev, u32 ofs, u8 val);
|
||||
unsigned char (*read_byte)(struct device *dev, u32 ofs);
|
||||
};
|
||||
|
||||
#endif /* _LINUX_RTC_M48T59_H_ */
|
||||
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