* [PATCH/RFC 2.6.27-rc8 2/2] drivers/rtc/rtc-twl4030.c
[not found] <200810011128.34179.david-b@pacbell.net>
@ 2008-10-01 18:50 ` David Brownell
0 siblings, 0 replies; only message in thread
From: David Brownell @ 2008-10-01 18:50 UTC (permalink / raw)
To: lkml; +Cc: Samuel Ortiz, Tony Lindgren, Felipe Balbi, linux-omap, rtc-linux
This is a driver for the RTC in the TWL4030 family chips.
POSTED AS A TWL4030 MFD EXAMPLE -- NOT YET FOR MERGING.
As an example ... since it seems closest of the various sub-chip
drivers to being ready for mainline. Why not yet for merging?
- This includes a cleanup patch that's not yet been merged into
its primary copy (in the OMAP tree), removing needless headers
that prevent building on non-OMAP systems.
- The <linux/i2c/...> header file should probably be removed ...
nothing in it should be needed outside of the RTC driver.
- IRQ handling issues:
* This depends on the TWL4030 MFD core, which isn't merged
yet (and which may well need discussion first, now that
it's been posted).
* It also depends on TWL4030 "power" interrupt handling,
which hasn't yet been submitted.
* I'm suspecting the IRQ handling is incorrect. Rather than
reading REG_PWR_ISR1 again (acking IRQs from other devices!)
maybe it can just trigger on one (!) edge.
Other than those issues, I think this driver should pretty much
be ready for mainline merge. It passes "rtctest" and seems
fairly clean.
But as always, review is appreciated. We all have blind spots;
many-eyes-helps, and all that. :)
---
drivers/rtc/Kconfig | 10
drivers/rtc/Makefile | 1
drivers/rtc/rtc-twl4030.c | 529 ++++++++++++++++++++++++++++++++++++++
include/linux/i2c/twl4030-rtc.h | 172 ++++++++++++
4 files changed, 712 insertions(+)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -246,6 +246,16 @@ config RTC_DRV_TWL92330
platforms. The support is integrated with the rest of
the Menelaus driver; it's not separate module.
+config RTC_DRV_TWL4030
+ tristate "TWL4030/TPS659x0 Real Time Clock"
+ depends on RTC_CLASS && TWL4030_CORE
+ help
+ If you say yes here you get support for internal Real-Time
+ Clock of TWL4030/TPS650x0 family chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-twl4030.
+
config RTC_DRV_S35390A
tristate "Seiko Instruments S-35390A"
select BITREVERSE
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa11
obj-$(CONFIG_RTC_DRV_SH) += rtc-sh.o
obj-$(CONFIG_RTC_DRV_STK17TA8) += rtc-stk17ta8.o
obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
+obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl4030.o
obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o
obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o
obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
--- /dev/null
+++ b/drivers/rtc/rtc-twl4030.c
@@ -0,0 +1,529 @@
+/*
+ * rtc-twl4030.c -- TWL4030 Real Time Clock interface
+ *
+ * Copyright (C) 2007 MontaVista Software, Inc
+ * Author: Alexandre Rusev <source@mvista.com>
+ *
+ * Based on original TI driver twl4030-rtc.c
+ * Copyright (C) 2006 Texas Instruments, Inc.
+ *
+ * Based on rtc-omap.c
+ * Copyright (C) 2003 MontaVista Software, Inc.
+ * Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
+ * Copyright (C) 2006 David Brownell
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+
+#include <linux/i2c/twl4030.h>
+#include <linux/i2c/twl4030-rtc.h>
+
+
+#define ALL_TIME_REGS 6
+
+/*
+ * Supports 1 byte read from TWL4030 RTC register.
+ */
+static int twl4030_rtc_read_u8(u8 *data, u8 reg)
+{
+ int ret;
+
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_RTC, data, reg);
+ if (ret < 0)
+ pr_err("twl4030_rtc: Could not read TWL4030"
+ "register %X - error %d\n", reg, ret);
+ return ret;
+}
+
+/*
+ * Supports 1 byte write to TWL4030 RTC registers.
+ */
+static int twl4030_rtc_write_u8(u8 data, u8 reg)
+{
+ int ret;
+
+ ret = twl4030_i2c_write_u8(TWL4030_MODULE_RTC, data, reg);
+ if (ret < 0)
+ pr_err("twl4030_rtc: Could not write TWL4030"
+ "register %X - error %d\n", reg, ret);
+ return ret;
+}
+
+/*
+ * Cache the value for timer/alarm interrupts register; this is
+ * only changed by callers holding rtc ops lock (or resume).
+ */
+static unsigned char rtc_irq_bits;
+
+/*
+ * Enable timer and/or alarm interrupts.
+ */
+static int set_rtc_irq_bit(unsigned char bit)
+{
+ unsigned char val;
+ int ret;
+
+ val = rtc_irq_bits | bit;
+ ret = twl4030_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
+ if (ret == 0)
+ rtc_irq_bits = val;
+
+ return ret;
+}
+
+/*
+ * Disable timer and/or alarm interrupts.
+ */
+static int mask_rtc_irq_bit(unsigned char bit)
+{
+ unsigned char val;
+ int ret;
+
+ val = rtc_irq_bits & ~bit;
+ ret = twl4030_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
+ if (ret == 0)
+ rtc_irq_bits = val;
+
+ return ret;
+}
+
+static inline int twl4030_rtc_alarm_irq_set_state(int enabled)
+{
+ int ret;
+
+ if (enabled)
+ ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
+ else
+ ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
+
+ return ret;
+}
+
+static inline int twl4030_rtc_irq_set_state(int enabled)
+{
+ int ret;
+
+ if (enabled)
+ ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
+ else
+ ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
+
+ return ret;
+}
+
+/*
+ * Gets current TWL4030 RTC time and date parameters.
+ *
+ * The RTC's time/alarm representation is not what gmtime(3) requires
+ * Linux to use:
+ *
+ * - Months are 1..12 vs Linux 0-11
+ * - Years are 0..99 vs Linux 1900..N (we assume 21st century)
+ */
+static int twl4030_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ unsigned char rtc_data[ALL_TIME_REGS + 1];
+ int ret;
+ u8 save_control;
+
+ ret = twl4030_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
+ if (ret < 0)
+ return ret;
+
+ save_control |= BIT_RTC_CTRL_REG_GET_TIME_M;
+
+ ret = twl4030_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
+ if (ret < 0)
+ return ret;
+
+ ret = twl4030_i2c_read(TWL4030_MODULE_RTC, rtc_data,
+ REG_SECONDS_REG, ALL_TIME_REGS);
+
+ if (ret < 0) {
+ dev_err(dev, "rtc_read_time error %d\n", ret);
+ return ret;
+ }
+
+ tm->tm_sec = bcd2bin(rtc_data[0]);
+ tm->tm_min = bcd2bin(rtc_data[1]);
+ tm->tm_hour = bcd2bin(rtc_data[2]);
+ tm->tm_mday = bcd2bin(rtc_data[3]);
+ tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
+ tm->tm_year = bcd2bin(rtc_data[5]) + 100;
+
+ return ret;
+}
+
+static int twl4030_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ unsigned char save_control;
+ unsigned char rtc_data[ALL_TIME_REGS + 1];
+ int ret;
+
+ rtc_data[1] = bin2bcd(tm->tm_sec);
+ rtc_data[2] = bin2bcd(tm->tm_min);
+ rtc_data[3] = bin2bcd(tm->tm_hour);
+ rtc_data[4] = bin2bcd(tm->tm_mday);
+ rtc_data[5] = bin2bcd(tm->tm_mon + 1);
+ rtc_data[6] = bin2bcd(tm->tm_year - 100);
+
+ /* Stop RTC while updating the TC registers */
+ ret = twl4030_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
+ if (ret < 0)
+ goto out;
+
+ save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
+ twl4030_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
+ if (ret < 0)
+ goto out;
+
+ /* update all the time registers in one shot */
+ ret = twl4030_i2c_write(TWL4030_MODULE_RTC, rtc_data,
+ REG_SECONDS_REG, ALL_TIME_REGS);
+ if (ret < 0) {
+ dev_err(dev, "rtc_set_time error %d\n", ret);
+ goto out;
+ }
+
+ /* Start back RTC */
+ save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
+ ret = twl4030_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
+
+out:
+ return ret;
+}
+
+/*
+ * Gets current TWL4030 RTC alarm time.
+ */
+static int twl4030_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ unsigned char rtc_data[ALL_TIME_REGS + 1];
+ int ret;
+
+ ret = twl4030_i2c_read(TWL4030_MODULE_RTC, rtc_data,
+ REG_ALARM_SECONDS_REG, ALL_TIME_REGS);
+ if (ret < 0) {
+ dev_err(dev, "rtc_read_alarm error %d\n", ret);
+ return ret;
+ }
+
+ /* some of these fields may be wildcard/"match all" */
+ alm->time.tm_sec = bcd2bin(rtc_data[0]);
+ alm->time.tm_min = bcd2bin(rtc_data[1]);
+ alm->time.tm_hour = bcd2bin(rtc_data[2]);
+ alm->time.tm_mday = bcd2bin(rtc_data[3]);
+ alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
+ alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
+
+ /* report cached alarm enable state */
+ if (rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
+ alm->enabled = 1;
+
+ return ret;
+}
+
+static int twl4030_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ unsigned char alarm_data[ALL_TIME_REGS + 1];
+ int ret;
+
+ ret = twl4030_rtc_alarm_irq_set_state(0);
+ if (ret)
+ goto out;
+
+ alarm_data[1] = bin2bcd(alm->time.tm_sec);
+ alarm_data[2] = bin2bcd(alm->time.tm_min);
+ alarm_data[3] = bin2bcd(alm->time.tm_hour);
+ alarm_data[4] = bin2bcd(alm->time.tm_mday);
+ alarm_data[5] = bin2bcd(alm->time.tm_mon + 1);
+ alarm_data[6] = bin2bcd(alm->time.tm_year - 100);
+
+ /* update all the alarm registers in one shot */
+ ret = twl4030_i2c_write(TWL4030_MODULE_RTC, alarm_data,
+ REG_ALARM_SECONDS_REG, ALL_TIME_REGS);
+ if (ret) {
+ dev_err(dev, "rtc_set_alarm error %d\n", ret);
+ goto out;
+ }
+
+ if (alm->enabled)
+ ret = twl4030_rtc_alarm_irq_set_state(1);
+out:
+ return ret;
+}
+
+#ifdef CONFIG_RTC_INTF_DEV
+
+static int twl4030_rtc_ioctl(struct device *dev, unsigned int cmd,
+ unsigned long arg)
+{
+ switch (cmd) {
+ case RTC_AIE_OFF:
+ return twl4030_rtc_alarm_irq_set_state(0);
+ case RTC_AIE_ON:
+ return twl4030_rtc_alarm_irq_set_state(1);
+ case RTC_UIE_OFF:
+ return twl4030_rtc_irq_set_state(0);
+ case RTC_UIE_ON:
+ return twl4030_rtc_irq_set_state(1);
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+#else
+#define omap_rtc_ioctl NULL
+#endif
+
+static irqreturn_t twl4030_rtc_interrupt(int irq, void *rtc)
+{
+ unsigned long events = 0;
+ int ret = IRQ_NONE;
+ int res;
+ u8 rd_reg;
+
+ res = twl4030_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
+ if (res)
+ goto out;
+ /*
+ * Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
+ * only one (ALARM or RTC) interrupt source may be enabled
+ * at time, we also could check our results
+ * by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
+ */
+ if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
+ events |= RTC_IRQF | RTC_AF;
+ else
+ events |= RTC_IRQF | RTC_UF;
+
+ res = twl4030_rtc_write_u8(rd_reg | BIT_RTC_STATUS_REG_ALARM_M,
+ REG_RTC_STATUS_REG);
+ if (res)
+ goto out;
+
+ /* Clear on Read enabled. RTC_IT bit of REG_PWR_ISR1 needs
+ * 2 reads to clear the interrupt. One read is done in
+ * do_twl4030_pwrirq(). Doing the second read, to clear
+ * the bit.
+ */
+ res = twl4030_i2c_read_u8(TWL4030_MODULE_INT, &rd_reg, REG_PWR_ISR1);
+ if (res)
+ goto out;
+
+ /* Notify RTC core on event */
+ rtc_update_irq(rtc, 1, events);
+
+ ret = IRQ_HANDLED;
+out:
+ return ret;
+}
+
+static struct rtc_class_ops twl4030_rtc_ops = {
+ .ioctl = twl4030_rtc_ioctl,
+ .read_time = twl4030_rtc_read_time,
+ .set_time = twl4030_rtc_set_time,
+ .read_alarm = twl4030_rtc_read_alarm,
+ .set_alarm = twl4030_rtc_set_alarm,
+};
+
+static int __devinit twl4030_rtc_probe(struct platform_device *pdev)
+{
+ struct twl4030rtc_platform_data *pdata = pdev->dev.platform_data;
+ struct rtc_device *rtc;
+ int ret = 0;
+ int irq = platform_get_irq(pdev, 0);
+ u8 rd_reg;
+
+ if (irq < 0)
+ return irq;
+
+ if (pdata != NULL && pdata->init != NULL) {
+ ret = pdata->init();
+ if (ret < 0)
+ goto out;
+ }
+
+ rtc = rtc_device_register(pdev->name,
+ &pdev->dev, &twl4030_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc)) {
+ ret = -EINVAL;
+ dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
+ PTR_ERR(rtc));
+ goto out0;
+
+ }
+
+ platform_set_drvdata(pdev, rtc);
+
+ ret = twl4030_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
+
+ if (ret < 0)
+ goto out1;
+
+ if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
+ dev_warn(&pdev->dev, "Power up reset detected.\n");
+
+ if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
+ dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
+
+ /* Clear RTC Power up reset and pending alarm interrupts */
+ ret = twl4030_rtc_write_u8(rd_reg, REG_RTC_STATUS_REG);
+ if (ret < 0)
+ goto out1;
+
+ ret = request_irq(irq, twl4030_rtc_interrupt,
+ 0, rtc->dev.bus_id, rtc);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "IRQ is not free.\n");
+ goto out1;
+ }
+
+ /* Check RTC module status, Enable if it is off */
+ ret = twl4030_rtc_read_u8(&rd_reg, REG_RTC_CTRL_REG);
+ if (ret < 0)
+ goto out2;
+
+ if (!(rd_reg & BIT_RTC_CTRL_REG_STOP_RTC_M)) {
+ dev_info(&pdev->dev, "Enabling TWL4030-RTC.\n");
+ rd_reg = BIT_RTC_CTRL_REG_STOP_RTC_M;
+ ret = twl4030_rtc_write_u8(rd_reg, REG_RTC_CTRL_REG);
+ if (ret < 0)
+ goto out2;
+ }
+
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_INT, &rd_reg, REG_PWR_IMR1);
+ if (ret < 0)
+ goto out2;
+
+ rd_reg &= PWR_RTC_IT_UNMASK;
+ /* MASK PWR - we will need this */
+ ret = twl4030_i2c_write_u8(TWL4030_MODULE_INT, rd_reg, REG_PWR_IMR1);
+ if (ret < 0)
+ goto out2;
+
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_INT, &rd_reg, REG_PWR_EDR1);
+ if (ret < 0)
+ goto out2;
+
+ /* Rising edge detection enabled, needed for RTC alarm */
+ rd_reg |= 0x80;
+ ret = twl4030_i2c_write_u8(TWL4030_MODULE_INT, rd_reg, REG_PWR_EDR1);
+ if (ret < 0)
+ goto out2;
+
+ /* init cached IRQ enable bits */
+ ret = twl4030_rtc_read_u8(&rtc_irq_bits, REG_RTC_INTERRUPTS_REG);
+ if (ret < 0)
+ goto out2;
+
+ return ret;
+
+
+out2:
+ free_irq(irq, rtc);
+out1:
+ rtc_device_unregister(rtc);
+out0:
+ if (pdata != NULL && pdata->exit != NULL)
+ pdata->exit();
+out:
+ return ret;
+}
+
+/*
+ * Disable all TWL4030 RTC module interrupts.
+ * Sets status flag to free.
+ */
+static int __devexit twl4030_rtc_remove(struct platform_device *pdev)
+{
+ /* leave rtc running, but disable irqs */
+ struct twl4030rtc_platform_data *pdata = pdev->dev.platform_data;
+ struct rtc_device *rtc = platform_get_drvdata(pdev);
+ int irq = platform_get_irq(pdev, 0);
+
+ mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
+ mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
+
+ free_irq(irq, rtc);
+
+ if (pdata != NULL && pdata->exit != NULL)
+ pdata->exit();
+
+ rtc_device_unregister(rtc);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static void twl4030_rtc_shutdown(struct platform_device *pdev)
+{
+ mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M |
+ BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
+}
+
+#ifdef CONFIG_PM
+
+static unsigned char irqstat;
+
+static int twl4030_rtc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ irqstat = rtc_irq_bits;
+
+ /* REVISIT alarm may need to wake us from sleep */
+ mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M |
+ BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
+ return 0;
+}
+
+static int twl4030_rtc_resume(struct platform_device *pdev)
+{
+ set_rtc_irq_bit(irqstat);
+ return 0;
+}
+
+#else
+#define twl4030_rtc_suspend NULL
+#define twl4030_rtc_resume NULL
+#endif
+
+MODULE_ALIAS("platform:twl4030_rtc");
+
+static struct platform_driver twl4030rtc_driver = {
+ .probe = twl4030_rtc_probe,
+ .remove = __devexit_p(twl4030_rtc_remove),
+ .shutdown = twl4030_rtc_shutdown,
+ .suspend = twl4030_rtc_suspend,
+ .resume = twl4030_rtc_resume,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "twl4030_rtc",
+ },
+};
+
+static int __init twl4030_rtc_init(void)
+{
+ return platform_driver_register(&twl4030rtc_driver);
+}
+module_init(twl4030_rtc_init);
+
+static void __exit twl4030_rtc_exit(void)
+{
+ platform_driver_unregister(&twl4030rtc_driver);
+}
+module_exit(twl4030_rtc_exit);
+
+MODULE_AUTHOR("Texas Instruments, MontaVista Software");
+MODULE_LICENSE("GPL");
--- /dev/null
+++ b/include/linux/i2c/twl4030-rtc.h
@@ -0,0 +1,172 @@
+/*
+ * include/asm-arm/arch-omap/twl4030-rtc.h
+ *
+ * Copyright (C) 2006 Texas Instruments, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#ifndef __TWL4030_RTC_H__
+#define __TWL4030_RTC_H__
+
+#define REG_SECONDS_REG (0x0)
+#define REG_MINUTES_REG (0x1)
+#define REG_HOURS_REG (0x2)
+#define REG_DAYS_REG (0x3)
+#define REG_MONTHS_REG (0x4)
+#define REG_YEARS_REG (0x5)
+#define REG_WEEKS_REG (0x6)
+#define REG_ALARM_SECONDS_REG (0x7)
+#define REG_ALARM_MINUTES_REG (0x8)
+#define REG_ALARM_HOURS_REG (0x9)
+#define REG_ALARM_DAYS_REG (0xA)
+#define REG_ALARM_MONTHS_REG (0xB)
+#define REG_ALARM_YEARS_REG (0xC)
+#define REG_RTC_CTRL_REG (0xD)
+#define REG_RTC_STATUS_REG (0xE)
+#define REG_RTC_INTERRUPTS_REG (0xF)
+#define REG_RTC_COMP_LSB_REG (0x10)
+#define REG_RTC_COMP_MSB_REG (0x11)
+
+/* REVISIT: these TWL4030 power registers are only used
+ * by rtc-twl4030 driver, move to an appropriate header
+ * if other drivers need the registers
+ */
+/* Power registers */
+#define REG_PWR_ISR1 0x00
+#define REG_PWR_IMR1 0x01
+#define REG_PWR_EDR1 0x05
+
+#define PWR_RTC_IT_UNMASK ~(0x08)
+#define PWR_RTC_INT_CLR 0x08
+
+/**** BitField Definitions */
+/* SECONDS_REG Fields */
+#define BIT_SECONDS_REG_SEC0 (0x000)
+#define BIT_SECONDS_REG_SEC0_M (0x0000000F)
+#define BIT_SECONDS_REG_SEC1 (0x004)
+#define BIT_SECONDS_REG_SEC1_M (0x00000070)
+/* MINUTES_REG Fields */
+#define BIT_MINUTES_REG_MIN0 (0x000)
+#define BIT_MINUTES_REG_MIN0_M (0x0000000F)
+#define BIT_MINUTES_REG_MIN1 (0x004)
+#define BIT_MINUTES_REG_MIN1_M (0x00000070)
+/* HOURS_REG Fields */
+#define BIT_HOURS_REG_HOUR0 (0x000)
+#define BIT_HOURS_REG_HOUR0_M (0x0000000F)
+#define BIT_HOURS_REG_HOUR1 (0x004)
+#define BIT_HOURS_REG_HOUR1_M (0x00000030)
+#define BIT_HOURS_REG_PM_NAM (0x007)
+#define BIT_HOURS_REG_PM_NAM_M (0x00000080)
+/* DAYS_REG Fields */
+#define BIT_DAYS_REG_DAY0 (0x000)
+#define BIT_DAYS_REG_DAY0_M (0x0000000F)
+#define BIT_DAYS_REG_DAY1 (0x004)
+#define BIT_DAYS_REG_DAY1_M (0x00000030)
+/* MONTHS_REG Fields */
+#define BIT_MONTHS_REG_MONTH0 (0x000)
+#define BIT_MONTHS_REG_MONTH0_M (0x0000000F)
+#define BIT_MONTHS_REG_MONTH1 (0x004)
+#define BIT_MONTHS_REG_MONTH1_M (0x00000010)
+/* YEARS_REG Fields */
+#define BIT_YEARS_REG_YEAR0 (0x000)
+#define BIT_YEARS_REG_YEAR0_M (0x0000000F)
+#define BIT_YEARS_REG_YEAR1 (0x004)
+#define BIT_YEARS_REG_YEAR1_M (0x000000F0)
+/* WEEKS_REG Fields */
+#define BIT_WEEKS_REG_WEEK (0x000)
+#define BIT_WEEKS_REG_WEEK_M (0x00000007)
+/* ALARM_SECONDS_REG Fields */
+#define BIT_ALARM_SECONDS_REG_ALARM_SEC0 (0x000)
+#define BIT_ALARM_SECONDS_REG_ALARM_SEC0_M (0x0000000F)
+#define BIT_ALARM_SECONDS_REG_ALARM_SEC1 (0x004)
+#define BIT_ALARM_SECONDS_REG_ALARM_SEC1_M (0x00000070)
+/* ALARM_MINUTES_REG Fields */
+#define BIT_ALARM_MINUTES_REG_ALARM_MIN0 (0x000)
+#define BIT_ALARM_MINUTES_REG_ALARM_MIN0_M (0x0000000F)
+#define BIT_ALARM_MINUTES_REG_ALARM_MIN1 (0x004)
+#define BIT_ALARM_MINUTES_REG_ALARM_MIN1_M (0x00000070)
+/* ALARM_HOURS_REG Fields */
+#define BIT_ALARM_HOURS_REG_ALARM_HOUR0 (0x000)
+#define BIT_ALARM_HOURS_REG_ALARM_HOUR0_M (0x0000000F)
+#define BIT_ALARM_HOURS_REG_ALARM_HOUR1 (0x004)
+#define BIT_ALARM_HOURS_REG_ALARM_HOUR1_M (0x00000030)
+#define BIT_ALARM_HOURS_REG_ALARM_PM_NAM (0x007)
+#define BIT_ALARM_HOURS_REG_ALARM_PM_NAM_M (0x00000080)
+/* ALARM_DAYS_REG Fields */
+#define BIT_ALARM_DAYS_REG_ALARM_DAY0 (0x000)
+#define BIT_ALARM_DAYS_REG_ALARM_DAY0_M (0x0000000F)
+#define BIT_ALARM_DAYS_REG_ALARM_DAY1 (0x004)
+#define BIT_ALARM_DAYS_REG_ALARM_DAY1_M (0x00000030)
+/* ALARM_MONTHS_REG Fields */
+#define BIT_ALARM_MONTHS_REG_ALARM_MONTH0 (0x000)
+#define BIT_ALARM_MONTHS_REG_ALARM_MONTH0_M (0x0000000F)
+#define BIT_ALARM_MONTHS_REG_ALARM_MONTH1 (0x004)
+#define BIT_ALARM_MONTHS_REG_ALARM_MONTH1_M (0x00000010)
+/* ALARM_YEARS_REG Fields */
+#define BIT_ALARM_YEARS_REG_ALARM_YEAR0 (0x000)
+#define BIT_ALARM_YEARS_REG_ALARM_YEAR0_M (0x0000000F)
+#define BIT_ALARM_YEARS_REG_ALARM_YEAR1 (0x004)
+#define BIT_ALARM_YEARS_REG_ALARM_YEAR1_M (0x000000F0)
+/* RTC_CTRL_REG Fields */
+#define BIT_RTC_CTRL_REG_STOP_RTC (0x000)
+#define BIT_RTC_CTRL_REG_STOP_RTC_M (0x00000001)
+#define BIT_RTC_CTRL_REG_ROUND_30S (0x001)
+#define BIT_RTC_CTRL_REG_ROUND_30S_M (0x00000002)
+#define BIT_RTC_CTRL_REG_AUTO_COMP (0x002)
+#define BIT_RTC_CTRL_REG_AUTO_COMP_M (0x00000004)
+#define BIT_RTC_CTRL_REG_MODE_12_24 (0x003)
+#define BIT_RTC_CTRL_REG_MODE_12_24_M (0x00000008)
+#define BIT_RTC_CTRL_REG_TEST_MODE (0x004)
+#define BIT_RTC_CTRL_REG_TEST_MODE_M (0x00000010)
+#define BIT_RTC_CTRL_REG_SET_32_COUNTER (0x005)
+#define BIT_RTC_CTRL_REG_SET_32_COUNTER_M (0x00000020)
+#define BIT_RTC_CTRL_REG_GET_TIME (0x006)
+#define BIT_RTC_CTRL_REG_GET_TIME_M (0x00000040)
+/* RTC_STATUS_REG Fields */
+#define BIT_RTC_STATUS_REG_RUN (0x001)
+#define BIT_RTC_STATUS_REG_RUN_M (0x00000002)
+#define BIT_RTC_STATUS_REG_1S_EVENT (0x002)
+#define BIT_RTC_STATUS_REG_1S_EVENT_M (0x00000004)
+#define BIT_RTC_STATUS_REG_1M_EVENT (0x003)
+#define BIT_RTC_STATUS_REG_1M_EVENT_M (0x00000008)
+#define BIT_RTC_STATUS_REG_1H_EVENT (0x004)
+#define BIT_RTC_STATUS_REG_1H_EVENT_M (0x00000010)
+#define BIT_RTC_STATUS_REG_1D_EVENT (0x005)
+#define BIT_RTC_STATUS_REG_1D_EVENT_M (0x00000020)
+#define BIT_RTC_STATUS_REG_ALARM (0x006)
+#define BIT_RTC_STATUS_REG_ALARM_M (0x00000040)
+#define BIT_RTC_STATUS_REG_POWER_UP (0x007)
+#define BIT_RTC_STATUS_REG_POWER_UP_M (0x00000080)
+
+/* RTC_INTERRUPTS_REG Fields */
+#define BIT_RTC_INTERRUPTS_REG_EVERY (0x000)
+#define BIT_RTC_INTERRUPTS_REG_EVERY_M (0x00000003)
+#define BIT_RTC_INTERRUPTS_REG_IT_TIMER (0x002)
+#define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M (0x00000004)
+#define BIT_RTC_INTERRUPTS_REG_IT_ALARM (0x003)
+#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M (0x00000008)
+/* RTC_COMP_LSB_REG Fields */
+#define BIT_RTC_COMP_LSB_REG_RTC_COMP_LSB (0x000)
+#define BIT_RTC_COMP_LSB_REG_RTC_COMP_LSB_M (0x000000FF)
+/* RTC_COMP_MSB_REG Fields */
+#define BIT_RTC_COMP_MSB_REG_RTC_COMP_MSB (0x000)
+#define BIT_RTC_COMP_MSB_REG_RTC_COMP_MSB_M (0x000000FF)
+
+struct twl4030rtc_platform_data {
+ int (*init)(void);
+ void (*exit)(void);
+};
+
+#endif /* End of __TWL4030_RTC_H__ */
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