919 строки
21 KiB
C
919 строки
21 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* RTC driver for the Micro Crystal RV3028
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*
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* Copyright (C) 2019 Micro Crystal SA
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*
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* Alexandre Belloni <alexandre.belloni@bootlin.com>
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*
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*/
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#include <linux/clk-provider.h>
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#include <linux/bcd.h>
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#include <linux/bitops.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/log2.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#define RV3028_SEC 0x00
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#define RV3028_MIN 0x01
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#define RV3028_HOUR 0x02
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#define RV3028_WDAY 0x03
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#define RV3028_DAY 0x04
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#define RV3028_MONTH 0x05
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#define RV3028_YEAR 0x06
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#define RV3028_ALARM_MIN 0x07
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#define RV3028_ALARM_HOUR 0x08
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#define RV3028_ALARM_DAY 0x09
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#define RV3028_STATUS 0x0E
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#define RV3028_CTRL1 0x0F
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#define RV3028_CTRL2 0x10
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#define RV3028_EVT_CTRL 0x13
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#define RV3028_TS_COUNT 0x14
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#define RV3028_TS_SEC 0x15
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#define RV3028_RAM1 0x1F
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#define RV3028_EEPROM_ADDR 0x25
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#define RV3028_EEPROM_DATA 0x26
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#define RV3028_EEPROM_CMD 0x27
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#define RV3028_CLKOUT 0x35
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#define RV3028_OFFSET 0x36
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#define RV3028_BACKUP 0x37
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#define RV3028_STATUS_PORF BIT(0)
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#define RV3028_STATUS_EVF BIT(1)
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#define RV3028_STATUS_AF BIT(2)
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#define RV3028_STATUS_TF BIT(3)
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#define RV3028_STATUS_UF BIT(4)
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#define RV3028_STATUS_BSF BIT(5)
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#define RV3028_STATUS_CLKF BIT(6)
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#define RV3028_STATUS_EEBUSY BIT(7)
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#define RV3028_CLKOUT_FD_MASK GENMASK(2, 0)
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#define RV3028_CLKOUT_PORIE BIT(3)
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#define RV3028_CLKOUT_CLKSY BIT(6)
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#define RV3028_CLKOUT_CLKOE BIT(7)
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#define RV3028_CTRL1_EERD BIT(3)
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#define RV3028_CTRL1_WADA BIT(5)
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#define RV3028_CTRL2_RESET BIT(0)
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#define RV3028_CTRL2_12_24 BIT(1)
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#define RV3028_CTRL2_EIE BIT(2)
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#define RV3028_CTRL2_AIE BIT(3)
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#define RV3028_CTRL2_TIE BIT(4)
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#define RV3028_CTRL2_UIE BIT(5)
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#define RV3028_CTRL2_TSE BIT(7)
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#define RV3028_EVT_CTRL_TSR BIT(2)
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#define RV3028_EEPROM_CMD_UPDATE 0x11
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#define RV3028_EEPROM_CMD_WRITE 0x21
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#define RV3028_EEPROM_CMD_READ 0x22
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#define RV3028_EEBUSY_POLL 10000
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#define RV3028_EEBUSY_TIMEOUT 100000
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#define RV3028_BACKUP_TCE BIT(5)
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#define RV3028_BACKUP_TCR_MASK GENMASK(1,0)
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#define OFFSET_STEP_PPT 953674
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enum rv3028_type {
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rv_3028,
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};
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struct rv3028_data {
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struct regmap *regmap;
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struct rtc_device *rtc;
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enum rv3028_type type;
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#ifdef CONFIG_COMMON_CLK
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struct clk_hw clkout_hw;
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#endif
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};
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static u16 rv3028_trickle_resistors[] = {3000, 5000, 9000, 15000};
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static ssize_t timestamp0_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
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regmap_update_bits(rv3028->regmap, RV3028_EVT_CTRL, RV3028_EVT_CTRL_TSR,
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RV3028_EVT_CTRL_TSR);
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return count;
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};
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static ssize_t timestamp0_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
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struct rtc_time tm;
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int ret, count;
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u8 date[6];
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ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count);
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if (ret)
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return ret;
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if (!count)
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return 0;
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ret = regmap_bulk_read(rv3028->regmap, RV3028_TS_SEC, date,
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sizeof(date));
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if (ret)
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return ret;
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tm.tm_sec = bcd2bin(date[0]);
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tm.tm_min = bcd2bin(date[1]);
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tm.tm_hour = bcd2bin(date[2]);
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tm.tm_mday = bcd2bin(date[3]);
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tm.tm_mon = bcd2bin(date[4]) - 1;
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tm.tm_year = bcd2bin(date[5]) + 100;
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ret = rtc_valid_tm(&tm);
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if (ret)
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return ret;
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return sprintf(buf, "%llu\n",
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(unsigned long long)rtc_tm_to_time64(&tm));
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};
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static DEVICE_ATTR_RW(timestamp0);
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static ssize_t timestamp0_count_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
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int ret, count;
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ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count);
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if (ret)
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return ret;
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return sprintf(buf, "%u\n", count);
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};
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static DEVICE_ATTR_RO(timestamp0_count);
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static struct attribute *rv3028_attrs[] = {
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&dev_attr_timestamp0.attr,
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&dev_attr_timestamp0_count.attr,
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NULL
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};
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static const struct attribute_group rv3028_attr_group = {
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.attrs = rv3028_attrs,
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};
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static int rv3028_exit_eerd(struct rv3028_data *rv3028, u32 eerd)
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{
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if (eerd)
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return 0;
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return regmap_update_bits(rv3028->regmap, RV3028_CTRL1, RV3028_CTRL1_EERD, 0);
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}
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static int rv3028_enter_eerd(struct rv3028_data *rv3028, u32 *eerd)
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{
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u32 ctrl1, status;
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int ret;
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ret = regmap_read(rv3028->regmap, RV3028_CTRL1, &ctrl1);
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if (ret)
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return ret;
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*eerd = ctrl1 & RV3028_CTRL1_EERD;
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if (*eerd)
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return 0;
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ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL1,
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RV3028_CTRL1_EERD, RV3028_CTRL1_EERD);
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if (ret)
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return ret;
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ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status,
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!(status & RV3028_STATUS_EEBUSY),
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RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
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if (ret) {
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rv3028_exit_eerd(rv3028, *eerd);
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return ret;
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}
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return 0;
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}
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static int rv3028_update_eeprom(struct rv3028_data *rv3028, u32 eerd)
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{
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u32 status;
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int ret;
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ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, 0x0);
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if (ret)
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goto exit_eerd;
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ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, RV3028_EEPROM_CMD_UPDATE);
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if (ret)
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goto exit_eerd;
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usleep_range(63000, RV3028_EEBUSY_TIMEOUT);
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ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status,
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!(status & RV3028_STATUS_EEBUSY),
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RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
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exit_eerd:
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rv3028_exit_eerd(rv3028, eerd);
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return ret;
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}
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static int rv3028_update_cfg(struct rv3028_data *rv3028, unsigned int reg,
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unsigned int mask, unsigned int val)
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{
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u32 eerd;
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int ret;
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ret = rv3028_enter_eerd(rv3028, &eerd);
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if (ret)
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return ret;
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ret = regmap_update_bits(rv3028->regmap, reg, mask, val);
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if (ret) {
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rv3028_exit_eerd(rv3028, eerd);
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return ret;
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}
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return rv3028_update_eeprom(rv3028, eerd);
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}
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static irqreturn_t rv3028_handle_irq(int irq, void *dev_id)
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{
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struct rv3028_data *rv3028 = dev_id;
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unsigned long events = 0;
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u32 status = 0, ctrl = 0;
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if (regmap_read(rv3028->regmap, RV3028_STATUS, &status) < 0 ||
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status == 0) {
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return IRQ_NONE;
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}
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status &= ~RV3028_STATUS_PORF;
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if (status & RV3028_STATUS_TF) {
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status |= RV3028_STATUS_TF;
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ctrl |= RV3028_CTRL2_TIE;
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events |= RTC_PF;
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}
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if (status & RV3028_STATUS_AF) {
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status |= RV3028_STATUS_AF;
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ctrl |= RV3028_CTRL2_AIE;
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events |= RTC_AF;
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}
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if (status & RV3028_STATUS_UF) {
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status |= RV3028_STATUS_UF;
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ctrl |= RV3028_CTRL2_UIE;
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events |= RTC_UF;
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}
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if (events) {
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rtc_update_irq(rv3028->rtc, 1, events);
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regmap_update_bits(rv3028->regmap, RV3028_STATUS, status, 0);
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regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ctrl, 0);
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}
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if (status & RV3028_STATUS_EVF) {
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sysfs_notify(&rv3028->rtc->dev.kobj, NULL,
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dev_attr_timestamp0.attr.name);
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dev_warn(&rv3028->rtc->dev, "event detected");
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}
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return IRQ_HANDLED;
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}
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static int rv3028_get_time(struct device *dev, struct rtc_time *tm)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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u8 date[7];
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int ret, status;
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ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
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if (ret < 0)
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return ret;
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if (status & RV3028_STATUS_PORF)
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return -EINVAL;
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ret = regmap_bulk_read(rv3028->regmap, RV3028_SEC, date, sizeof(date));
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if (ret)
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return ret;
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tm->tm_sec = bcd2bin(date[RV3028_SEC] & 0x7f);
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tm->tm_min = bcd2bin(date[RV3028_MIN] & 0x7f);
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tm->tm_hour = bcd2bin(date[RV3028_HOUR] & 0x3f);
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tm->tm_wday = date[RV3028_WDAY] & 0x7f;
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tm->tm_mday = bcd2bin(date[RV3028_DAY] & 0x3f);
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tm->tm_mon = bcd2bin(date[RV3028_MONTH] & 0x1f) - 1;
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tm->tm_year = bcd2bin(date[RV3028_YEAR]) + 100;
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return 0;
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}
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static int rv3028_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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u8 date[7];
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int ret;
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date[RV3028_SEC] = bin2bcd(tm->tm_sec);
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date[RV3028_MIN] = bin2bcd(tm->tm_min);
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date[RV3028_HOUR] = bin2bcd(tm->tm_hour);
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date[RV3028_WDAY] = tm->tm_wday;
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date[RV3028_DAY] = bin2bcd(tm->tm_mday);
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date[RV3028_MONTH] = bin2bcd(tm->tm_mon + 1);
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date[RV3028_YEAR] = bin2bcd(tm->tm_year - 100);
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/*
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* Writing to the Seconds register has the same effect as setting RESET
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* bit to 1
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*/
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ret = regmap_bulk_write(rv3028->regmap, RV3028_SEC, date,
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sizeof(date));
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if (ret)
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return ret;
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ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
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RV3028_STATUS_PORF, 0);
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return ret;
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}
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static int rv3028_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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u8 alarmvals[3];
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int status, ctrl, ret;
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ret = regmap_bulk_read(rv3028->regmap, RV3028_ALARM_MIN, alarmvals,
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sizeof(alarmvals));
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if (ret)
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return ret;
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ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
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if (ret < 0)
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return ret;
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ret = regmap_read(rv3028->regmap, RV3028_CTRL2, &ctrl);
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if (ret < 0)
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return ret;
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alrm->time.tm_sec = 0;
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alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
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alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
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alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
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alrm->enabled = !!(ctrl & RV3028_CTRL2_AIE);
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alrm->pending = (status & RV3028_STATUS_AF) && alrm->enabled;
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return 0;
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}
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static int rv3028_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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u8 alarmvals[3];
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u8 ctrl = 0;
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int ret;
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/* The alarm has no seconds, round up to nearest minute */
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if (alrm->time.tm_sec) {
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time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
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alarm_time += 60 - alrm->time.tm_sec;
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rtc_time64_to_tm(alarm_time, &alrm->time);
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}
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ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
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RV3028_CTRL2_AIE | RV3028_CTRL2_UIE, 0);
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if (ret)
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return ret;
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alarmvals[0] = bin2bcd(alrm->time.tm_min);
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alarmvals[1] = bin2bcd(alrm->time.tm_hour);
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alarmvals[2] = bin2bcd(alrm->time.tm_mday);
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ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
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RV3028_STATUS_AF, 0);
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if (ret)
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return ret;
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ret = regmap_bulk_write(rv3028->regmap, RV3028_ALARM_MIN, alarmvals,
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sizeof(alarmvals));
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if (ret)
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return ret;
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if (alrm->enabled) {
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if (rv3028->rtc->uie_rtctimer.enabled)
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ctrl |= RV3028_CTRL2_UIE;
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if (rv3028->rtc->aie_timer.enabled)
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ctrl |= RV3028_CTRL2_AIE;
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}
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ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
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RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl);
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return ret;
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}
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static int rv3028_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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int ctrl = 0, ret;
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if (enabled) {
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if (rv3028->rtc->uie_rtctimer.enabled)
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ctrl |= RV3028_CTRL2_UIE;
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if (rv3028->rtc->aie_timer.enabled)
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ctrl |= RV3028_CTRL2_AIE;
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}
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ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
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RV3028_STATUS_AF | RV3028_STATUS_UF, 0);
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if (ret)
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return ret;
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ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
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RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl);
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if (ret)
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return ret;
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return 0;
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}
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static int rv3028_read_offset(struct device *dev, long *offset)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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int ret, value, steps;
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ret = regmap_read(rv3028->regmap, RV3028_OFFSET, &value);
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if (ret < 0)
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return ret;
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steps = sign_extend32(value << 1, 8);
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ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &value);
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if (ret < 0)
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return ret;
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steps += value >> 7;
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*offset = DIV_ROUND_CLOSEST(steps * OFFSET_STEP_PPT, 1000);
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return 0;
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}
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static int rv3028_set_offset(struct device *dev, long offset)
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{
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struct rv3028_data *rv3028 = dev_get_drvdata(dev);
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u32 eerd;
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int ret;
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offset = clamp(offset, -244141L, 243187L) * 1000;
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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_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,
|
|
};
|
|
|
|
static const struct regmap_config regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = 0x37,
|
|
};
|
|
|
|
static int rv3028_probe(struct i2c_client *client)
|
|
{
|
|
struct rv3028_data *rv3028;
|
|
int ret, status;
|
|
u32 ohms;
|
|
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, ®map_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) {
|
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, rv3028_handle_irq,
|
|
IRQF_TRIGGER_LOW | 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;
|
|
|
|
/* 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)) {
|
|
ret = rv3028_update_cfg(rv3028, RV3028_BACKUP, RV3028_BACKUP_TCE |
|
|
RV3028_BACKUP_TCR_MASK, RV3028_BACKUP_TCE | i);
|
|
if (ret)
|
|
return ret;
|
|
} else {
|
|
dev_warn(&client->dev, "invalid trickle resistor value\n");
|
|
}
|
|
}
|
|
|
|
ret = rtc_add_group(rv3028->rtc, &rv3028_attr_group);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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 __maybe_unused struct of_device_id rv3028_of_match[] = {
|
|
{ .compatible = "microcrystal,rv3028", },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, rv3028_of_match);
|
|
|
|
static struct i2c_driver rv3028_driver = {
|
|
.driver = {
|
|
.name = "rtc-rv3028",
|
|
.of_match_table = of_match_ptr(rv3028_of_match),
|
|
},
|
|
.probe_new = 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");
|