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linux/drivers/rtc/rtc-da9063.c
S Twiss 80ca3277bc rtc: da9063: Add DA9062 RTC capability to DA9063 RTC driver 
Add DA9062 RTC support into the existing DA9063 RTC driver component by
using generic access tables for common register and bit mask definitions.

The following change will add generic register and bit mask support to the
DA9063 RTC. The changes are slightly complicated by requiring support for
three register sets: DA9063-AD, DA9063-BB and DA9062-AA.

The following alterations have been made to the DA9063 RTC:

- Addition of a da9063_compatible_rtc_regmap structure to hold all generic
  registers and bitmasks for this type of RTC component.
- A re-write of struct da9063 to use pointers for regmap and compatible
  registers/masks definitions
- Addition of a of_device_id table for DA9063 and DA9062 defaults
- Refactoring functions to use struct da9063_compatible_rtc accesses to
  generic registers/masks instead of using defines from registers.h
- Re-work of da9063_rtc_probe() to use of_match_node() and dev_get_regmap()
  to provide initialisation of generic registers and masks and access to
  regmap

Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-09-05 13:19:08 +02:00

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/* rtc-da9063.c - Real time clock device driver for DA9063
* Copyright (C) 2013-14 Dialog Semiconductor Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*/
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/mfd/da9062/registers.h>
#include <linux/mfd/da9063/registers.h>
#include <linux/mfd/da9063/core.h>
#define YEARS_TO_DA9063(year) ((year) - 100)
#define MONTHS_TO_DA9063(month) ((month) + 1)
#define YEARS_FROM_DA9063(year) ((year) + 100)
#define MONTHS_FROM_DA9063(month) ((month) - 1)
enum {
RTC_SEC = 0,
RTC_MIN = 1,
RTC_HOUR = 2,
RTC_DAY = 3,
RTC_MONTH = 4,
RTC_YEAR = 5,
RTC_DATA_LEN
};
struct da9063_compatible_rtc_regmap {
/* REGS */
int rtc_enable_reg;
int rtc_enable_32k_crystal_reg;
int rtc_alarm_secs_reg;
int rtc_alarm_year_reg;
int rtc_count_secs_reg;
int rtc_count_year_reg;
int rtc_event_reg;
/* MASKS */
int rtc_enable_mask;
int rtc_crystal_mask;
int rtc_event_alarm_mask;
int rtc_alarm_on_mask;
int rtc_alarm_status_mask;
int rtc_tick_on_mask;
int rtc_ready_to_read_mask;
int rtc_count_sec_mask;
int rtc_count_min_mask;
int rtc_count_hour_mask;
int rtc_count_day_mask;
int rtc_count_month_mask;
int rtc_count_year_mask;
/* ALARM CONFIG */
int rtc_data_start;
int rtc_alarm_len;
};
struct da9063_compatible_rtc {
struct rtc_device *rtc_dev;
struct rtc_time alarm_time;
struct regmap *regmap;
const struct da9063_compatible_rtc_regmap *config;
bool rtc_sync;
};
static const struct da9063_compatible_rtc_regmap da9063_ad_regs = {
/* REGS */
.rtc_enable_reg = DA9063_REG_CONTROL_E,
.rtc_alarm_secs_reg = DA9063_AD_REG_ALARM_MI,
.rtc_alarm_year_reg = DA9063_AD_REG_ALARM_Y,
.rtc_count_secs_reg = DA9063_REG_COUNT_S,
.rtc_count_year_reg = DA9063_REG_COUNT_Y,
.rtc_event_reg = DA9063_REG_EVENT_A,
/* MASKS */
.rtc_enable_mask = DA9063_RTC_EN,
.rtc_crystal_mask = DA9063_CRYSTAL,
.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
.rtc_event_alarm_mask = DA9063_E_ALARM,
.rtc_alarm_on_mask = DA9063_ALARM_ON,
.rtc_alarm_status_mask = DA9063_ALARM_STATUS_ALARM |
DA9063_ALARM_STATUS_TICK,
.rtc_tick_on_mask = DA9063_TICK_ON,
.rtc_ready_to_read_mask = DA9063_RTC_READ,
.rtc_count_sec_mask = DA9063_COUNT_SEC_MASK,
.rtc_count_min_mask = DA9063_COUNT_MIN_MASK,
.rtc_count_hour_mask = DA9063_COUNT_HOUR_MASK,
.rtc_count_day_mask = DA9063_COUNT_DAY_MASK,
.rtc_count_month_mask = DA9063_COUNT_MONTH_MASK,
.rtc_count_year_mask = DA9063_COUNT_YEAR_MASK,
/* ALARM CONFIG */
.rtc_data_start = RTC_MIN,
.rtc_alarm_len = RTC_DATA_LEN - 1,
};
static const struct da9063_compatible_rtc_regmap da9063_bb_regs = {
/* REGS */
.rtc_enable_reg = DA9063_REG_CONTROL_E,
.rtc_alarm_secs_reg = DA9063_BB_REG_ALARM_S,
.rtc_alarm_year_reg = DA9063_BB_REG_ALARM_Y,
.rtc_count_secs_reg = DA9063_REG_COUNT_S,
.rtc_count_year_reg = DA9063_REG_COUNT_Y,
.rtc_event_reg = DA9063_REG_EVENT_A,
/* MASKS */
.rtc_enable_mask = DA9063_RTC_EN,
.rtc_crystal_mask = DA9063_CRYSTAL,
.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
.rtc_event_alarm_mask = DA9063_E_ALARM,
.rtc_alarm_on_mask = DA9063_ALARM_ON,
.rtc_alarm_status_mask = DA9063_ALARM_STATUS_ALARM |
DA9063_ALARM_STATUS_TICK,
.rtc_tick_on_mask = DA9063_TICK_ON,
.rtc_ready_to_read_mask = DA9063_RTC_READ,
.rtc_count_sec_mask = DA9063_COUNT_SEC_MASK,
.rtc_count_min_mask = DA9063_COUNT_MIN_MASK,
.rtc_count_hour_mask = DA9063_COUNT_HOUR_MASK,
.rtc_count_day_mask = DA9063_COUNT_DAY_MASK,
.rtc_count_month_mask = DA9063_COUNT_MONTH_MASK,
.rtc_count_year_mask = DA9063_COUNT_YEAR_MASK,
/* ALARM CONFIG */
.rtc_data_start = RTC_SEC,
.rtc_alarm_len = RTC_DATA_LEN,
};
static const struct da9063_compatible_rtc_regmap da9062_aa_regs = {
/* REGS */
.rtc_enable_reg = DA9062AA_CONTROL_E,
.rtc_alarm_secs_reg = DA9062AA_ALARM_S,
.rtc_alarm_year_reg = DA9062AA_ALARM_Y,
.rtc_count_secs_reg = DA9062AA_COUNT_S,
.rtc_count_year_reg = DA9062AA_COUNT_Y,
.rtc_event_reg = DA9062AA_EVENT_A,
/* MASKS */
.rtc_enable_mask = DA9062AA_RTC_EN_MASK,
.rtc_crystal_mask = DA9062AA_CRYSTAL_MASK,
.rtc_enable_32k_crystal_reg = DA9062AA_EN_32K,
.rtc_event_alarm_mask = DA9062AA_M_ALARM_MASK,
.rtc_alarm_on_mask = DA9062AA_ALARM_ON_MASK,
.rtc_alarm_status_mask = (0x02 << 6),
.rtc_tick_on_mask = DA9062AA_TICK_ON_MASK,
.rtc_ready_to_read_mask = DA9062AA_RTC_READ_MASK,
.rtc_count_sec_mask = DA9062AA_COUNT_SEC_MASK,
.rtc_count_min_mask = DA9062AA_COUNT_MIN_MASK,
.rtc_count_hour_mask = DA9062AA_COUNT_HOUR_MASK,
.rtc_count_day_mask = DA9062AA_COUNT_DAY_MASK,
.rtc_count_month_mask = DA9062AA_COUNT_MONTH_MASK,
.rtc_count_year_mask = DA9062AA_COUNT_YEAR_MASK,
/* ALARM CONFIG */
.rtc_data_start = RTC_SEC,
.rtc_alarm_len = RTC_DATA_LEN,
};
static const struct of_device_id da9063_compatible_reg_id_table[] = {
{ .compatible = "dlg,da9063-rtc", .data = &da9063_bb_regs },
{ .compatible = "dlg,da9062-rtc", .data = &da9062_aa_regs },
{ },
};
static void da9063_data_to_tm(u8 *data, struct rtc_time *tm,
struct da9063_compatible_rtc *rtc)
{
const struct da9063_compatible_rtc_regmap *config = rtc->config;
tm->tm_sec = data[RTC_SEC] & config->rtc_count_sec_mask;
tm->tm_min = data[RTC_MIN] & config->rtc_count_min_mask;
tm->tm_hour = data[RTC_HOUR] & config->rtc_count_hour_mask;
tm->tm_mday = data[RTC_DAY] & config->rtc_count_day_mask;
tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] &
config->rtc_count_month_mask);
tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
config->rtc_count_year_mask);
}
static void da9063_tm_to_data(struct rtc_time *tm, u8 *data,
struct da9063_compatible_rtc *rtc)
{
const struct da9063_compatible_rtc_regmap *config = rtc->config;
data[RTC_SEC] &= ~config->rtc_count_sec_mask;
data[RTC_SEC] |= tm->tm_sec & config->rtc_count_sec_mask;
data[RTC_MIN] &= ~config->rtc_count_min_mask;
data[RTC_MIN] |= tm->tm_min & config->rtc_count_min_mask;
data[RTC_HOUR] &= ~config->rtc_count_hour_mask;
data[RTC_HOUR] |= tm->tm_hour & config->rtc_count_hour_mask;
data[RTC_DAY] &= ~config->rtc_count_day_mask;
data[RTC_DAY] |= tm->tm_mday & config->rtc_count_day_mask;
data[RTC_MONTH] &= ~config->rtc_count_month_mask;
data[RTC_MONTH] |= MONTHS_TO_DA9063(tm->tm_mon) &
config->rtc_count_month_mask;
data[RTC_YEAR] &= ~config->rtc_count_year_mask;
data[RTC_YEAR] |= YEARS_TO_DA9063(tm->tm_year) &
config->rtc_count_year_mask;
}
static int da9063_rtc_stop_alarm(struct device *dev)
{
struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
const struct da9063_compatible_rtc_regmap *config = rtc->config;
return regmap_update_bits(rtc->regmap,
config->rtc_alarm_year_reg,
config->rtc_alarm_on_mask,
0);
}
static int da9063_rtc_start_alarm(struct device *dev)
{
struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
const struct da9063_compatible_rtc_regmap *config = rtc->config;
return regmap_update_bits(rtc->regmap,
config->rtc_alarm_year_reg,
config->rtc_alarm_on_mask,
config->rtc_alarm_on_mask);
}
static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
const struct da9063_compatible_rtc_regmap *config = rtc->config;
unsigned long tm_secs;
unsigned long al_secs;
u8 data[RTC_DATA_LEN];
int ret;
ret = regmap_bulk_read(rtc->regmap,
config->rtc_count_secs_reg,
data, RTC_DATA_LEN);
if (ret < 0) {
dev_err(dev, "Failed to read RTC time data: %d\n", ret);
return ret;
}
if (!(data[RTC_SEC] & config->rtc_ready_to_read_mask)) {
dev_dbg(dev, "RTC not yet ready to be read by the host\n");
return -EINVAL;
}
da9063_data_to_tm(data, tm, rtc);
rtc_tm_to_time(tm, &tm_secs);
rtc_tm_to_time(&rtc->alarm_time, &al_secs);
/* handle the rtc synchronisation delay */
if (rtc->rtc_sync == true && al_secs - tm_secs == 1)
memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
else
rtc->rtc_sync = false;
return rtc_valid_tm(tm);
}
static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
const struct da9063_compatible_rtc_regmap *config = rtc->config;
u8 data[RTC_DATA_LEN];
int ret;
da9063_tm_to_data(tm, data, rtc);
ret = regmap_bulk_write(rtc->regmap,
config->rtc_count_secs_reg,
data, RTC_DATA_LEN);
if (ret < 0)
dev_err(dev, "Failed to set RTC time data: %d\n", ret);
return ret;
}
static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
const struct da9063_compatible_rtc_regmap *config = rtc->config;
u8 data[RTC_DATA_LEN];
int ret;
unsigned int val;
data[RTC_SEC] = 0;
ret = regmap_bulk_read(rtc->regmap,
config->rtc_alarm_secs_reg,
&data[config->rtc_data_start],
config->rtc_alarm_len);
if (ret < 0)
return ret;
da9063_data_to_tm(data, &alrm->time, rtc);
alrm->enabled = !!(data[RTC_YEAR] & config->rtc_alarm_on_mask);
ret = regmap_read(rtc->regmap,
config->rtc_event_reg,
&val);
if (ret < 0)
return ret;
if (val & config->rtc_event_alarm_mask)
alrm->pending = 1;
else
alrm->pending = 0;
return 0;
}
static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
const struct da9063_compatible_rtc_regmap *config = rtc->config;
u8 data[RTC_DATA_LEN];
int ret;
da9063_tm_to_data(&alrm->time, data, rtc);
ret = da9063_rtc_stop_alarm(dev);
if (ret < 0) {
dev_err(dev, "Failed to stop alarm: %d\n", ret);
return ret;
}
ret = regmap_bulk_write(rtc->regmap,
config->rtc_alarm_secs_reg,
&data[config->rtc_data_start],
config->rtc_alarm_len);
if (ret < 0) {
dev_err(dev, "Failed to write alarm: %d\n", ret);
return ret;
}
da9063_data_to_tm(data, &rtc->alarm_time, rtc);
if (alrm->enabled) {
ret = da9063_rtc_start_alarm(dev);
if (ret < 0) {
dev_err(dev, "Failed to start alarm: %d\n", ret);
return ret;
}
}
return ret;
}
static int da9063_rtc_alarm_irq_enable(struct device *dev,
unsigned int enabled)
{
if (enabled)
return da9063_rtc_start_alarm(dev);
else
return da9063_rtc_stop_alarm(dev);
}
static irqreturn_t da9063_alarm_event(int irq, void *data)
{
struct da9063_compatible_rtc *rtc = data;
const struct da9063_compatible_rtc_regmap *config = rtc->config;
regmap_update_bits(rtc->regmap,
config->rtc_alarm_year_reg,
config->rtc_alarm_on_mask,
0);
rtc->rtc_sync = true;
rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;
}
static const struct rtc_class_ops da9063_rtc_ops = {
.read_time = da9063_rtc_read_time,
.set_time = da9063_rtc_set_time,
.read_alarm = da9063_rtc_read_alarm,
.set_alarm = da9063_rtc_set_alarm,
.alarm_irq_enable = da9063_rtc_alarm_irq_enable,
};
static int da9063_rtc_probe(struct platform_device *pdev)
{
struct da9063_compatible_rtc *rtc;
const struct da9063_compatible_rtc_regmap *config;
const struct of_device_id *match;
int irq_alarm;
u8 data[RTC_DATA_LEN];
int ret;
if (!pdev->dev.of_node)
return -ENXIO;
match = of_match_node(da9063_compatible_reg_id_table,
pdev->dev.of_node);
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
if (!rtc)
return -ENOMEM;
rtc->config = match->data;
if (of_device_is_compatible(pdev->dev.of_node, "dlg,da9063-rtc")) {
struct da9063 *chip = dev_get_drvdata(pdev->dev.parent);
if (chip->variant_code == PMIC_DA9063_AD)
rtc->config = &da9063_ad_regs;
}
rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!rtc->regmap) {
dev_warn(&pdev->dev, "Parent regmap unavailable.\n");
return -ENXIO;
}
config = rtc->config;
ret = regmap_update_bits(rtc->regmap,
config->rtc_enable_reg,
config->rtc_enable_mask,
config->rtc_enable_mask);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to enable RTC\n");
return ret;
}
ret = regmap_update_bits(rtc->regmap,
config->rtc_enable_32k_crystal_reg,
config->rtc_crystal_mask,
config->rtc_crystal_mask);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
return ret;
}
ret = regmap_update_bits(rtc->regmap,
config->rtc_alarm_secs_reg,
config->rtc_alarm_status_mask,
0);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
return ret;
}
ret = regmap_update_bits(rtc->regmap,
config->rtc_alarm_secs_reg,
DA9063_ALARM_STATUS_ALARM,
DA9063_ALARM_STATUS_ALARM);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
return ret;
}
ret = regmap_update_bits(rtc->regmap,
config->rtc_alarm_year_reg,
config->rtc_tick_on_mask,
0);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to disable TICKs\n");
return ret;
}
data[RTC_SEC] = 0;
ret = regmap_bulk_read(rtc->regmap,
config->rtc_alarm_secs_reg,
&data[config->rtc_data_start],
config->rtc_alarm_len);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
ret);
return ret;
}
platform_set_drvdata(pdev, rtc);
irq_alarm = platform_get_irq_byname(pdev, "ALARM");
ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
da9063_alarm_event,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"ALARM", rtc);
if (ret) {
dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
irq_alarm, ret);
return ret;
}
rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC,
&da9063_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc->rtc_dev))
return PTR_ERR(rtc->rtc_dev);
da9063_data_to_tm(data, &rtc->alarm_time, rtc);
rtc->rtc_sync = false;
return ret;
}
static struct platform_driver da9063_rtc_driver = {
.probe = da9063_rtc_probe,
.driver = {
.name = DA9063_DRVNAME_RTC,
.of_match_table = da9063_compatible_reg_id_table,
},
};
module_platform_driver(da9063_rtc_driver);
MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);
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