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linux/drivers/rtc/rtc-rv3028.c
Rob Herring 48144c2890 rtc: Explicitly include correct DT includes 
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230724205456.767430-1-robh@kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2023-07-27 23:31:29 +02:00

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24 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* RTC driver for the Micro Crystal RV3028
*
* Copyright (C) 2019 Micro Crystal SA
*
* Alexandre Belloni <alexandre.belloni@bootlin.com>
*
*/
#include <linux/clk-provider.h>
#include <linux/bcd.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#define RV3028_SEC 0x00
#define RV3028_MIN 0x01
#define RV3028_HOUR 0x02
#define RV3028_WDAY 0x03
#define RV3028_DAY 0x04
#define RV3028_MONTH 0x05
#define RV3028_YEAR 0x06
#define RV3028_ALARM_MIN 0x07
#define RV3028_ALARM_HOUR 0x08
#define RV3028_ALARM_DAY 0x09
#define RV3028_STATUS 0x0E
#define RV3028_CTRL1 0x0F
#define RV3028_CTRL2 0x10
#define RV3028_EVT_CTRL 0x13
#define RV3028_TS_COUNT 0x14
#define RV3028_TS_SEC 0x15
#define RV3028_RAM1 0x1F
#define RV3028_EEPROM_ADDR 0x25
#define RV3028_EEPROM_DATA 0x26
#define RV3028_EEPROM_CMD 0x27
#define RV3028_CLKOUT 0x35
#define RV3028_OFFSET 0x36
#define RV3028_BACKUP 0x37
#define RV3028_STATUS_PORF BIT(0)
#define RV3028_STATUS_EVF BIT(1)
#define RV3028_STATUS_AF BIT(2)
#define RV3028_STATUS_TF BIT(3)
#define RV3028_STATUS_UF BIT(4)
#define RV3028_STATUS_BSF BIT(5)
#define RV3028_STATUS_CLKF BIT(6)
#define RV3028_STATUS_EEBUSY BIT(7)
#define RV3028_CLKOUT_FD_MASK GENMASK(2, 0)
#define RV3028_CLKOUT_PORIE BIT(3)
#define RV3028_CLKOUT_CLKSY BIT(6)
#define RV3028_CLKOUT_CLKOE BIT(7)
#define RV3028_CTRL1_EERD BIT(3)
#define RV3028_CTRL1_WADA BIT(5)
#define RV3028_CTRL2_RESET BIT(0)
#define RV3028_CTRL2_12_24 BIT(1)
#define RV3028_CTRL2_EIE BIT(2)
#define RV3028_CTRL2_AIE BIT(3)
#define RV3028_CTRL2_TIE BIT(4)
#define RV3028_CTRL2_UIE BIT(5)
#define RV3028_CTRL2_TSE BIT(7)
#define RV3028_EVT_CTRL_TSR BIT(2)
#define RV3028_EEPROM_CMD_UPDATE 0x11
#define RV3028_EEPROM_CMD_WRITE 0x21
#define RV3028_EEPROM_CMD_READ 0x22
#define RV3028_EEBUSY_POLL 10000
#define RV3028_EEBUSY_TIMEOUT 100000
#define RV3028_BACKUP_TCE BIT(5)
#define RV3028_BACKUP_TCR_MASK GENMASK(1,0)
#define RV3028_BACKUP_BSM GENMASK(3,2)
#define RV3028_BACKUP_BSM_DSM 0x1
#define RV3028_BACKUP_BSM_LSM 0x3
#define OFFSET_STEP_PPT 953674
enum rv3028_type {
rv_3028,
};
struct rv3028_data {
struct regmap *regmap;
struct rtc_device *rtc;
enum rv3028_type type;
#ifdef CONFIG_COMMON_CLK
struct clk_hw clkout_hw;
#endif
};
static u16 rv3028_trickle_resistors[] = {3000, 5000, 9000, 15000};
static ssize_t timestamp0_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
regmap_update_bits(rv3028->regmap, RV3028_EVT_CTRL, RV3028_EVT_CTRL_TSR,
RV3028_EVT_CTRL_TSR);
return count;
};
static ssize_t timestamp0_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
struct rtc_time tm;
int ret, count;
u8 date[6];
ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count);
if (ret)
return ret;
if (!count)
return 0;
ret = regmap_bulk_read(rv3028->regmap, RV3028_TS_SEC, date,
sizeof(date));
if (ret)
return ret;
tm.tm_sec = bcd2bin(date[0]);
tm.tm_min = bcd2bin(date[1]);
tm.tm_hour = bcd2bin(date[2]);
tm.tm_mday = bcd2bin(date[3]);
tm.tm_mon = bcd2bin(date[4]) - 1;
tm.tm_year = bcd2bin(date[5]) + 100;
ret = rtc_valid_tm(&tm);
if (ret)
return ret;
return sprintf(buf, "%llu\n",
(unsigned long long)rtc_tm_to_time64(&tm));
};
static DEVICE_ATTR_RW(timestamp0);
static ssize_t timestamp0_count_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
int ret, count;
ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count);
if (ret)
return ret;
return sprintf(buf, "%u\n", count);
};
static DEVICE_ATTR_RO(timestamp0_count);
static struct attribute *rv3028_attrs[] = {
&dev_attr_timestamp0.attr,
&dev_attr_timestamp0_count.attr,
NULL
};
static const struct attribute_group rv3028_attr_group = {
.attrs = rv3028_attrs,
};
static int rv3028_exit_eerd(struct rv3028_data *rv3028, u32 eerd)
{
if (eerd)
return 0;
return regmap_update_bits(rv3028->regmap, RV3028_CTRL1, RV3028_CTRL1_EERD, 0);
}
static int rv3028_enter_eerd(struct rv3028_data *rv3028, u32 *eerd)
{
u32 ctrl1, status;
int ret;
ret = regmap_read(rv3028->regmap, RV3028_CTRL1, &ctrl1);
if (ret)
return ret;
*eerd = ctrl1 & RV3028_CTRL1_EERD;
if (*eerd)
return 0;
ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL1,
RV3028_CTRL1_EERD, RV3028_CTRL1_EERD);
if (ret)
return ret;
ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status,
!(status & RV3028_STATUS_EEBUSY),
RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
if (ret) {
rv3028_exit_eerd(rv3028, *eerd);
return ret;
}
return 0;
}
static int rv3028_update_eeprom(struct rv3028_data *rv3028, u32 eerd)
{
u32 status;
int ret;
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, 0x0);
if (ret)
goto exit_eerd;
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, RV3028_EEPROM_CMD_UPDATE);
if (ret)
goto exit_eerd;
usleep_range(63000, RV3028_EEBUSY_TIMEOUT);
ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status,
!(status & RV3028_STATUS_EEBUSY),
RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
exit_eerd:
rv3028_exit_eerd(rv3028, eerd);
return ret;
}
static int rv3028_update_cfg(struct rv3028_data *rv3028, unsigned int reg,
unsigned int mask, unsigned int val)
{
u32 eerd;
int ret;
ret = rv3028_enter_eerd(rv3028, &eerd);
if (ret)
return ret;
ret = regmap_update_bits(rv3028->regmap, reg, mask, val);
if (ret) {
rv3028_exit_eerd(rv3028, eerd);
return ret;
}
return rv3028_update_eeprom(rv3028, eerd);
}
static irqreturn_t rv3028_handle_irq(int irq, void *dev_id)
{
struct rv3028_data *rv3028 = dev_id;
unsigned long events = 0;
u32 status = 0, ctrl = 0;
if (regmap_read(rv3028->regmap, RV3028_STATUS, &status) < 0 ||
status == 0) {
return IRQ_NONE;
}
status &= ~RV3028_STATUS_PORF;
if (status & RV3028_STATUS_TF) {
status |= RV3028_STATUS_TF;
ctrl |= RV3028_CTRL2_TIE;
events |= RTC_PF;
}
if (status & RV3028_STATUS_AF) {
status |= RV3028_STATUS_AF;
ctrl |= RV3028_CTRL2_AIE;
events |= RTC_AF;
}
if (status & RV3028_STATUS_UF) {
status |= RV3028_STATUS_UF;
ctrl |= RV3028_CTRL2_UIE;
events |= RTC_UF;
}
if (events) {
rtc_update_irq(rv3028->rtc, 1, events);
regmap_update_bits(rv3028->regmap, RV3028_STATUS, status, 0);
regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ctrl, 0);
}
if (status & RV3028_STATUS_EVF) {
sysfs_notify(&rv3028->rtc->dev.kobj, NULL,
dev_attr_timestamp0.attr.name);
dev_warn(&rv3028->rtc->dev, "event detected");
}
return IRQ_HANDLED;
}
static int rv3028_get_time(struct device *dev, struct rtc_time *tm)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev);
u8 date[7];
int ret, status;
ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
if (ret < 0)
return ret;
if (status & RV3028_STATUS_PORF)
return -EINVAL;
ret = regmap_bulk_read(rv3028->regmap, RV3028_SEC, date, sizeof(date));
if (ret)
return ret;
tm->tm_sec = bcd2bin(date[RV3028_SEC] & 0x7f);
tm->tm_min = bcd2bin(date[RV3028_MIN] & 0x7f);
tm->tm_hour = bcd2bin(date[RV3028_HOUR] & 0x3f);
tm->tm_wday = date[RV3028_WDAY] & 0x7f;
tm->tm_mday = bcd2bin(date[RV3028_DAY] & 0x3f);
tm->tm_mon = bcd2bin(date[RV3028_MONTH] & 0x1f) - 1;
tm->tm_year = bcd2bin(date[RV3028_YEAR]) + 100;
return 0;
}
static int rv3028_set_time(struct device *dev, struct rtc_time *tm)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev);
u8 date[7];
int ret;
date[RV3028_SEC] = bin2bcd(tm->tm_sec);
date[RV3028_MIN] = bin2bcd(tm->tm_min);
date[RV3028_HOUR] = bin2bcd(tm->tm_hour);
date[RV3028_WDAY] = tm->tm_wday;
date[RV3028_DAY] = bin2bcd(tm->tm_mday);
date[RV3028_MONTH] = bin2bcd(tm->tm_mon + 1);
date[RV3028_YEAR] = bin2bcd(tm->tm_year - 100);
/*
* Writing to the Seconds register has the same effect as setting RESET
* bit to 1
*/
ret = regmap_bulk_write(rv3028->regmap, RV3028_SEC, date,
sizeof(date));
if (ret)
return ret;
ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
RV3028_STATUS_PORF, 0);
return ret;
}
static int rv3028_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev);
u8 alarmvals[3];
int status, ctrl, ret;
ret = regmap_bulk_read(rv3028->regmap, RV3028_ALARM_MIN, alarmvals,
sizeof(alarmvals));
if (ret)
return ret;
ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
if (ret < 0)
return ret;
ret = regmap_read(rv3028->regmap, RV3028_CTRL2, &ctrl);
if (ret < 0)
return ret;
alrm->time.tm_sec = 0;
alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
alrm->enabled = !!(ctrl & RV3028_CTRL2_AIE);
alrm->pending = (status & RV3028_STATUS_AF) && alrm->enabled;
return 0;
}
static int rv3028_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev);
u8 alarmvals[3];
u8 ctrl = 0;
int ret;
/* The alarm has no seconds, round up to nearest minute */
if (alrm->time.tm_sec) {
time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
alarm_time += 60 - alrm->time.tm_sec;
rtc_time64_to_tm(alarm_time, &alrm->time);
}
ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
RV3028_CTRL2_AIE | RV3028_CTRL2_UIE, 0);
if (ret)
return ret;
alarmvals[0] = bin2bcd(alrm->time.tm_min);
alarmvals[1] = bin2bcd(alrm->time.tm_hour);
alarmvals[2] = bin2bcd(alrm->time.tm_mday);
ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
RV3028_STATUS_AF, 0);
if (ret)
return ret;
ret = regmap_bulk_write(rv3028->regmap, RV3028_ALARM_MIN, alarmvals,
sizeof(alarmvals));
if (ret)
return ret;
if (alrm->enabled) {
if (rv3028->rtc->uie_rtctimer.enabled)
ctrl |= RV3028_CTRL2_UIE;
if (rv3028->rtc->aie_timer.enabled)
ctrl |= RV3028_CTRL2_AIE;
}
ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl);
return ret;
}
static int rv3028_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev);
int ctrl = 0, ret;
if (enabled) {
if (rv3028->rtc->uie_rtctimer.enabled)
ctrl |= RV3028_CTRL2_UIE;
if (rv3028->rtc->aie_timer.enabled)
ctrl |= RV3028_CTRL2_AIE;
}
ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
RV3028_STATUS_AF | RV3028_STATUS_UF, 0);
if (ret)
return ret;
ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl);
if (ret)
return ret;
return 0;
}
static int rv3028_read_offset(struct device *dev, long *offset)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev);
int ret, value, steps;
ret = regmap_read(rv3028->regmap, RV3028_OFFSET, &value);
if (ret < 0)
return ret;
steps = sign_extend32(value << 1, 8);
ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &value);
if (ret < 0)
return ret;
steps += value >> 7;
*offset = DIV_ROUND_CLOSEST(steps * OFFSET_STEP_PPT, 1000);
return 0;
}
static int rv3028_set_offset(struct device *dev, long offset)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev);
u32 eerd;
int ret;
offset = clamp(offset, -244141L, 243187L) * 1000;
offset = DIV_ROUND_CLOSEST(offset, OFFSET_STEP_PPT);
ret = rv3028_enter_eerd(rv3028, &eerd);
if (ret)
return ret;
ret = regmap_write(rv3028->regmap, RV3028_OFFSET, offset >> 1);
if (ret < 0)
goto exit_eerd;
ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP, BIT(7),
offset << 7);
if (ret < 0)
goto exit_eerd;
return rv3028_update_eeprom(rv3028, eerd);
exit_eerd:
rv3028_exit_eerd(rv3028, eerd);
return ret;
}
static int rv3028_param_get(struct device *dev, struct rtc_param *param)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev);
int ret;
u32 value;
switch(param->param) {
case RTC_PARAM_BACKUP_SWITCH_MODE:
ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &value);
if (ret < 0)
return ret;
value = FIELD_GET(RV3028_BACKUP_BSM, value);
switch(value) {
case RV3028_BACKUP_BSM_DSM:
param->uvalue = RTC_BSM_DIRECT;
break;
case RV3028_BACKUP_BSM_LSM:
param->uvalue = RTC_BSM_LEVEL;
break;
default:
param->uvalue = RTC_BSM_DISABLED;
}
break;
default:
return -EINVAL;
}
return 0;
}
static int rv3028_param_set(struct device *dev, struct rtc_param *param)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev);
u8 mode;
switch(param->param) {
case RTC_PARAM_BACKUP_SWITCH_MODE:
switch (param->uvalue) {
case RTC_BSM_DISABLED:
mode = 0;
break;
case RTC_BSM_DIRECT:
mode = RV3028_BACKUP_BSM_DSM;
break;
case RTC_BSM_LEVEL:
mode = RV3028_BACKUP_BSM_LSM;
break;
default:
return -EINVAL;
}
return rv3028_update_cfg(rv3028, RV3028_BACKUP, RV3028_BACKUP_BSM,
FIELD_PREP(RV3028_BACKUP_BSM, mode));
default:
return -EINVAL;
}
return 0;
}
static int rv3028_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
struct rv3028_data *rv3028 = dev_get_drvdata(dev);
int status, ret = 0;
switch (cmd) {
case RTC_VL_READ:
ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
if (ret < 0)
return ret;
status = status & RV3028_STATUS_PORF ? RTC_VL_DATA_INVALID : 0;
return put_user(status, (unsigned int __user *)arg);
default:
return -ENOIOCTLCMD;
}
}
static int rv3028_nvram_write(void *priv, unsigned int offset, void *val,
size_t bytes)
{
return regmap_bulk_write(priv, RV3028_RAM1 + offset, val, bytes);
}
static int rv3028_nvram_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
return regmap_bulk_read(priv, RV3028_RAM1 + offset, val, bytes);
}
static int rv3028_eeprom_write(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct rv3028_data *rv3028 = priv;
u32 status, eerd;
int i, ret;
u8 *buf = val;
ret = rv3028_enter_eerd(rv3028, &eerd);
if (ret)
return ret;
for (i = 0; i < bytes; i++) {
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_ADDR, offset + i);
if (ret)
goto restore_eerd;
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_DATA, buf[i]);
if (ret)
goto restore_eerd;
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, 0x0);
if (ret)
goto restore_eerd;
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD,
RV3028_EEPROM_CMD_WRITE);
if (ret)
goto restore_eerd;
usleep_range(RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status,
!(status & RV3028_STATUS_EEBUSY),
RV3028_EEBUSY_POLL,
RV3028_EEBUSY_TIMEOUT);
if (ret)
goto restore_eerd;
}
restore_eerd:
rv3028_exit_eerd(rv3028, eerd);
return ret;
}
static int rv3028_eeprom_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct rv3028_data *rv3028 = priv;
u32 status, eerd, data;
int i, ret;
u8 *buf = val;
ret = rv3028_enter_eerd(rv3028, &eerd);
if (ret)
return ret;
for (i = 0; i < bytes; i++) {
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_ADDR, offset + i);
if (ret)
goto restore_eerd;
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, 0x0);
if (ret)
goto restore_eerd;
ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD,
RV3028_EEPROM_CMD_READ);
if (ret)
goto restore_eerd;
ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status,
!(status & RV3028_STATUS_EEBUSY),
RV3028_EEBUSY_POLL,
RV3028_EEBUSY_TIMEOUT);
if (ret)
goto restore_eerd;
ret = regmap_read(rv3028->regmap, RV3028_EEPROM_DATA, &data);
if (ret)
goto restore_eerd;
buf[i] = data;
}
restore_eerd:
rv3028_exit_eerd(rv3028, eerd);
return ret;
}
#ifdef CONFIG_COMMON_CLK
#define clkout_hw_to_rv3028(hw) container_of(hw, struct rv3028_data, clkout_hw)
static int clkout_rates[] = {
32768,
8192,
1024,
64,
32,
1,
};
static unsigned long rv3028_clkout_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
int clkout, ret;
struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw);
ret = regmap_read(rv3028->regmap, RV3028_CLKOUT, &clkout);
if (ret < 0)
return 0;
clkout &= RV3028_CLKOUT_FD_MASK;
return clkout_rates[clkout];
}
static long rv3028_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
int i;
for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
if (clkout_rates[i] <= rate)
return clkout_rates[i];
return 0;
}
static int rv3028_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
int i, ret;
u32 enabled;
struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw);
ret = regmap_read(rv3028->regmap, RV3028_CLKOUT, &enabled);
if (ret < 0)
return ret;
ret = regmap_write(rv3028->regmap, RV3028_CLKOUT, 0x0);
if (ret < 0)
return ret;
enabled &= RV3028_CLKOUT_CLKOE;
for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
if (clkout_rates[i] == rate)
return rv3028_update_cfg(rv3028, RV3028_CLKOUT, 0xff,
RV3028_CLKOUT_CLKSY | enabled | i);
return -EINVAL;
}
static int rv3028_clkout_prepare(struct clk_hw *hw)
{
struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw);
return regmap_write(rv3028->regmap, RV3028_CLKOUT,
RV3028_CLKOUT_CLKSY | RV3028_CLKOUT_CLKOE);
}
static void rv3028_clkout_unprepare(struct clk_hw *hw)
{
struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw);
regmap_write(rv3028->regmap, RV3028_CLKOUT, 0x0);
regmap_update_bits(rv3028->regmap, RV3028_STATUS,
RV3028_STATUS_CLKF, 0);
}
static int rv3028_clkout_is_prepared(struct clk_hw *hw)
{
int clkout, ret;
struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw);
ret = regmap_read(rv3028->regmap, RV3028_CLKOUT, &clkout);
if (ret < 0)
return ret;
return !!(clkout & RV3028_CLKOUT_CLKOE);
}
static const struct clk_ops rv3028_clkout_ops = {
.prepare = rv3028_clkout_prepare,
.unprepare = rv3028_clkout_unprepare,
.is_prepared = rv3028_clkout_is_prepared,
.recalc_rate = rv3028_clkout_recalc_rate,
.round_rate = rv3028_clkout_round_rate,
.set_rate = rv3028_clkout_set_rate,
};
static int rv3028_clkout_register_clk(struct rv3028_data *rv3028,
struct i2c_client *client)
{
int ret;
struct clk *clk;
struct clk_init_data init;
struct device_node *node = client->dev.of_node;
ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
RV3028_STATUS_CLKF, 0);
if (ret < 0)
return ret;
init.name = "rv3028-clkout";
init.ops = &rv3028_clkout_ops;
init.flags = 0;
init.parent_names = NULL;
init.num_parents = 0;
rv3028->clkout_hw.init = &init;
/* optional override of the clockname */
of_property_read_string(node, "clock-output-names", &init.name);
/* register the clock */
clk = devm_clk_register(&client->dev, &rv3028->clkout_hw);
if (!IS_ERR(clk))
of_clk_add_provider(node, of_clk_src_simple_get, clk);
return 0;
}
#endif
static const struct rtc_class_ops rv3028_rtc_ops = {
.read_time = rv3028_get_time,
.set_time = rv3028_set_time,
.read_alarm = rv3028_get_alarm,
.set_alarm = rv3028_set_alarm,
.alarm_irq_enable = rv3028_alarm_irq_enable,
.read_offset = rv3028_read_offset,
.set_offset = rv3028_set_offset,
.ioctl = rv3028_ioctl,
.param_get = rv3028_param_get,
.param_set = rv3028_param_set,
};
static const struct regmap_config regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x37,
};
static u8 rv3028_set_trickle_charger(struct rv3028_data *rv3028,
struct i2c_client *client)
{
int ret, val_old, val;
u32 ohms, chargeable;
ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &val_old);
if (ret < 0)
return ret;
/* mask out only trickle charger bits */
val_old = val_old & (RV3028_BACKUP_TCE | RV3028_BACKUP_TCR_MASK);
val = val_old;
/* setup trickle charger */
if (!device_property_read_u32(&client->dev, "trickle-resistor-ohms",
&ohms)) {
int i;
for (i = 0; i < ARRAY_SIZE(rv3028_trickle_resistors); i++)
if (ohms == rv3028_trickle_resistors[i])
break;
if (i < ARRAY_SIZE(rv3028_trickle_resistors)) {
/* enable trickle charger and its resistor */
val = RV3028_BACKUP_TCE | i;
} else {
dev_warn(&client->dev, "invalid trickle resistor value\n");
}
}
if (!device_property_read_u32(&client->dev, "aux-voltage-chargeable",
&chargeable)) {
switch (chargeable) {
case 0:
val &= ~RV3028_BACKUP_TCE;
break;
case 1:
val |= RV3028_BACKUP_TCE;
break;
default:
dev_warn(&client->dev,
"unsupported aux-voltage-chargeable value\n");
break;
}
}
/* only update EEPROM if changes are necessary */
if (val_old != val) {
ret = rv3028_update_cfg(rv3028, RV3028_BACKUP, RV3028_BACKUP_TCE |
RV3028_BACKUP_TCR_MASK, val);
if (ret)
return ret;
}
return ret;
}
static int rv3028_probe(struct i2c_client *client)
{
struct rv3028_data *rv3028;
int ret, status;
struct nvmem_config nvmem_cfg = {
.name = "rv3028_nvram",
.word_size = 1,
.stride = 1,
.size = 2,
.type = NVMEM_TYPE_BATTERY_BACKED,
.reg_read = rv3028_nvram_read,
.reg_write = rv3028_nvram_write,
};
struct nvmem_config eeprom_cfg = {
.name = "rv3028_eeprom",
.word_size = 1,
.stride = 1,
.size = 43,
.type = NVMEM_TYPE_EEPROM,
.reg_read = rv3028_eeprom_read,
.reg_write = rv3028_eeprom_write,
};
rv3028 = devm_kzalloc(&client->dev, sizeof(struct rv3028_data),
GFP_KERNEL);
if (!rv3028)
return -ENOMEM;
rv3028->regmap = devm_regmap_init_i2c(client, &regmap_config);
if (IS_ERR(rv3028->regmap))
return PTR_ERR(rv3028->regmap);
i2c_set_clientdata(client, rv3028);
ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
if (ret < 0)
return ret;
if (status & RV3028_STATUS_AF)
dev_warn(&client->dev, "An alarm may have been missed.\n");
rv3028->rtc = devm_rtc_allocate_device(&client->dev);
if (IS_ERR(rv3028->rtc))
return PTR_ERR(rv3028->rtc);
if (client->irq > 0) {
unsigned long flags;
/*
* If flags = 0, devm_request_threaded_irq() will use IRQ flags
* obtained from device tree.
*/
if (dev_fwnode(&client->dev))
flags = 0;
else
flags = IRQF_TRIGGER_LOW;
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, rv3028_handle_irq,
flags | IRQF_ONESHOT,
"rv3028", rv3028);
if (ret) {
dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
client->irq = 0;
}
}
if (!client->irq)
clear_bit(RTC_FEATURE_ALARM, rv3028->rtc->features);
ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL1,
RV3028_CTRL1_WADA, RV3028_CTRL1_WADA);
if (ret)
return ret;
/* setup timestamping */
ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
RV3028_CTRL2_EIE | RV3028_CTRL2_TSE,
RV3028_CTRL2_EIE | RV3028_CTRL2_TSE);
if (ret)
return ret;
ret = rv3028_set_trickle_charger(rv3028, client);
if (ret)
return ret;
ret = rtc_add_group(rv3028->rtc, &rv3028_attr_group);
if (ret)
return ret;
set_bit(RTC_FEATURE_BACKUP_SWITCH_MODE, rv3028->rtc->features);
rv3028->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
rv3028->rtc->range_max = RTC_TIMESTAMP_END_2099;
rv3028->rtc->ops = &rv3028_rtc_ops;
ret = devm_rtc_register_device(rv3028->rtc);
if (ret)
return ret;
nvmem_cfg.priv = rv3028->regmap;
devm_rtc_nvmem_register(rv3028->rtc, &nvmem_cfg);
eeprom_cfg.priv = rv3028;
devm_rtc_nvmem_register(rv3028->rtc, &eeprom_cfg);
rv3028->rtc->max_user_freq = 1;
#ifdef CONFIG_COMMON_CLK
rv3028_clkout_register_clk(rv3028, client);
#endif
return 0;
}
static const struct acpi_device_id rv3028_i2c_acpi_match[] = {
{ "MCRY3028" },
{ }
};
MODULE_DEVICE_TABLE(acpi, rv3028_i2c_acpi_match);
static const __maybe_unused struct of_device_id rv3028_of_match[] = {
{ .compatible = "microcrystal,rv3028", },
{ }
};
MODULE_DEVICE_TABLE(of, rv3028_of_match);
static const struct i2c_device_id rv3028_id_table[] = {
{ .name = "rv3028", },
{ }
};
MODULE_DEVICE_TABLE(i2c, rv3028_id_table);
static struct i2c_driver rv3028_driver = {
.driver = {
.name = "rtc-rv3028",
.acpi_match_table = rv3028_i2c_acpi_match,
.of_match_table = of_match_ptr(rv3028_of_match),
},
.id_table = rv3028_id_table,
.probe = rv3028_probe,
};
module_i2c_driver(rv3028_driver);
MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
MODULE_DESCRIPTION("Micro Crystal RV3028 RTC driver");
MODULE_LICENSE("GPL v2");
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