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alistair23-linux/drivers/rtc/rtc-da9063.c
Linus Torvalds 8e4ff713ce RTC for 5.2 
Subsystem:
  - set_mmss and set_mmss64 rtc_ops removal
  - Fix timestamp value for RTC_TIMESTAMP_BEGIN_1900
  - Use SPDX identifier for the core
  - validate upper bound of tm->tm_year
 
 New driver:
  - Aspeed BMC SoC RTC
 
 Drivers:
  - abx80x: use rtc_add_group
  - ds3232: nvram support
  - pcf85063: add alarm, nvram, offset correction and microcrystal rv8263 support
  - x1205: add of_match_table
  - Use set_time instead of set_mms/set_mmss64 for: ab3100, coh901331, digicolor,
    ds1672, ds2404, ep93xx, imxdi, jz4740, lpc32xx, mc13xxx, mxc, pcap, stmp3xxx,
    test, wm831x, xgene.
  - Set RTC range for: ab3100, at91sam9, coh901331, da9063, digicolor, dm355evm,
    ds1672, ds2404, ep39xx, goldfish, imxdi, jz4740, lpc32xx, mc13xxx, mv, mxc,
    omap, pcap, pcf85063, pcf85363, ps3, sh, stmp3xxx, sun4v, tegra, wm831x,
    xgene.
  - Switch to rtc_time64_to_tm/rtc_tm_to_time64 for the driver that properly set
    the RTC range.
  - Use dev_get_drvdata instead of multiple indirections.
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Merge tag 'rtc-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "A huge series from me this cycle. I went through many drivers to set
  the date and time range supported by the RTC which helps solving HW
  limitation when the time comes (as early as next year for some). This
  time, I focused on drivers using .set_mms and .set_mmss64, allowing me
  to remove those callbacks. About a third of the patches got reviews, I
  actually own the RTCs and I tested another third and the remaining one
  are unlikely to cause any issues.

  Other than that, a single new driver and the usual fixes here and there.

  Summary:

  Subsystem:

   - set_mmss and set_mmss64 rtc_ops removal

   - Fix timestamp value for RTC_TIMESTAMP_BEGIN_1900

   - Use SPDX identifier for the core

   - validate upper bound of tm->tm_year

  New driver:

   - Aspeed BMC SoC RTC

  Drivers:

   - abx80x: use rtc_add_group

   - ds3232: nvram support

   - pcf85063: add alarm, nvram, offset correction and microcrystal
     rv8263 support

   - x1205: add of_match_table

   - Use set_time instead of set_mms/set_mmss64 for: ab3100, coh901331,
     digicolor, ds1672, ds2404, ep93xx, imxdi, jz4740, lpc32xx, mc13xxx,
     mxc, pcap, stmp3xxx, test, wm831x, xgene.

   - Set RTC range for: ab3100, at91sam9, coh901331, da9063, digicolor,
     dm355evm, ds1672, ds2404, ep39xx, goldfish, imxdi, jz4740, lpc32xx,
     mc13xxx, mv, mxc, omap, pcap, pcf85063, pcf85363, ps3, sh,
     stmp3xxx, sun4v, tegra, wm831x, xgene.

   - Switch to rtc_time64_to_tm/rtc_tm_to_time64 for the driver that
     properly set the RTC range.

   - Use dev_get_drvdata instead of multiple indirections"

* tag 'rtc-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (177 commits)
  rtc: snvs: Use __maybe_unused instead of #if CONFIG_PM_SLEEP
  rtc: imxdi: remove unused variable
  rtc: drop set_mms and set_mmss64
  rtc: pcap: convert to SPDX identifier
  rtc: pcap: use .set_time
  rtc: pcap: switch to rtc_time64_to_tm/rtc_tm_to_time64
  rtc: pcap: set range
  rtc: digicolor: convert to SPDX identifier
  rtc: digicolor: use .set_time
  rtc: digicolor: set range
  rtc: digicolor: fix possible race condition
  rtc: jz4740: convert to SPDX identifier
  rtc: jz4740: rework invalid time detection
  rtc: jz4740: use dev_pm_set_wake_irq() to simplify code
  rtc: jz4740: use .set_time
  rtc: jz4740: remove useless check
  rtc: jz4740: switch to rtc_time64_to_tm/rtc_tm_to_time64
  rtc: jz4740: set range
  rtc: 88pm860x: prevent use-after-free on device remove
  rtc: Use dev_get_drvdata()
  ...
2019-05-09 14:46:33 -07:00

511 lines
15 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0+
/*
* Real time clock device driver for DA9063
* Copyright (C) 2013-2015 Dialog Semiconductor Ltd.
*/
#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 },
{ },
};
MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
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] = tm->tm_sec & config->rtc_count_sec_mask;
data[RTC_MIN] = tm->tm_min & config->rtc_count_min_mask;
data[RTC_HOUR] = tm->tm_hour & config->rtc_count_hour_mask;
data[RTC_DAY] = tm->tm_mday & config->rtc_count_day_mask;
data[RTC_MONTH] = MONTHS_TO_DA9063(tm->tm_mon) &
config->rtc_count_month_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);
tm_secs = rtc_tm_to_time64(tm);
al_secs = rtc_tm_to_time64(&rtc->alarm_time);
/* 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 0;
}
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);
rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc->rtc_dev))
return PTR_ERR(rtc->rtc_dev);
rtc->rtc_dev->ops = &da9063_rtc_ops;
rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_2000;
rtc->rtc_dev->range_max = RTC_TIMESTAMP_END_2063;
da9063_data_to_tm(data, &rtc->alarm_time, rtc);
rtc->rtc_sync = false;
/*
* TODO: some models have alarms on a minute boundary but still support
* real hardware interrupts. Add this once the core supports it.
*/
if (config->rtc_data_start != RTC_SEC)
rtc->rtc_dev->uie_unsupported = 1;
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 rtc_register_device(rtc->rtc_dev);
}
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");
MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);
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