686 строки
17 KiB
C
686 строки
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* An I2C driver for the PCF85063 RTC
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* Copyright 2014 Rose Technology
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*
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* Author: Søren Andersen <san@rosetechnology.dk>
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* Maintainers: http://www.nslu2-linux.org/
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*
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* Copyright (C) 2019 Micro Crystal AG
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* Author: Alexandre Belloni <alexandre.belloni@bootlin.com>
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*/
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#include <linux/clk-provider.h>
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#include <linux/i2c.h>
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#include <linux/bcd.h>
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#include <linux/rtc.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/pm_wakeirq.h>
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#include <linux/regmap.h>
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/*
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* Information for this driver was pulled from the following datasheets.
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*
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* https://www.nxp.com/docs/en/data-sheet/PCF85063A.pdf
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* https://www.nxp.com/docs/en/data-sheet/PCF85063TP.pdf
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*
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* PCF85063A -- Rev. 7 — 30 March 2018
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* PCF85063TP -- Rev. 4 — 6 May 2015
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*
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* https://www.microcrystal.com/fileadmin/Media/Products/RTC/App.Manual/RV-8263-C7_App-Manual.pdf
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* RV8263 -- Rev. 1.0 — January 2019
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*/
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#define PCF85063_REG_CTRL1 0x00 /* status */
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#define PCF85063_REG_CTRL1_CAP_SEL BIT(0)
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#define PCF85063_REG_CTRL1_STOP BIT(5)
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#define PCF85063_REG_CTRL1_EXT_TEST BIT(7)
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#define PCF85063_REG_CTRL2 0x01
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#define PCF85063_CTRL2_AF BIT(6)
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#define PCF85063_CTRL2_AIE BIT(7)
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#define PCF85063_REG_OFFSET 0x02
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#define PCF85063_OFFSET_SIGN_BIT 6 /* 2's complement sign bit */
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#define PCF85063_OFFSET_MODE BIT(7)
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#define PCF85063_OFFSET_STEP0 4340
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#define PCF85063_OFFSET_STEP1 4069
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#define PCF85063_REG_CLKO_F_MASK 0x07 /* frequency mask */
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#define PCF85063_REG_CLKO_F_32768HZ 0x00
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#define PCF85063_REG_CLKO_F_OFF 0x07
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#define PCF85063_REG_RAM 0x03
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#define PCF85063_REG_SC 0x04 /* datetime */
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#define PCF85063_REG_SC_OS 0x80
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#define PCF85063_REG_ALM_S 0x0b
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#define PCF85063_AEN BIT(7)
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struct pcf85063_config {
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struct regmap_config regmap;
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unsigned has_alarms:1;
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unsigned force_cap_7000:1;
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};
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struct pcf85063 {
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struct rtc_device *rtc;
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struct regmap *regmap;
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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 int pcf85063_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
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int rc;
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u8 regs[7];
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/*
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* while reading, the time/date registers are blocked and not updated
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* anymore until the access is finished. To not lose a second
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* event, the access must be finished within one second. So, read all
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* time/date registers in one turn.
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*/
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rc = regmap_bulk_read(pcf85063->regmap, PCF85063_REG_SC, regs,
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sizeof(regs));
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if (rc)
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return rc;
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/* if the clock has lost its power it makes no sense to use its time */
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if (regs[0] & PCF85063_REG_SC_OS) {
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dev_warn(&pcf85063->rtc->dev, "Power loss detected, invalid time\n");
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return -EINVAL;
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}
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tm->tm_sec = bcd2bin(regs[0] & 0x7F);
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tm->tm_min = bcd2bin(regs[1] & 0x7F);
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tm->tm_hour = bcd2bin(regs[2] & 0x3F); /* rtc hr 0-23 */
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tm->tm_mday = bcd2bin(regs[3] & 0x3F);
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tm->tm_wday = regs[4] & 0x07;
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tm->tm_mon = bcd2bin(regs[5] & 0x1F) - 1; /* rtc mn 1-12 */
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tm->tm_year = bcd2bin(regs[6]);
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tm->tm_year += 100;
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return 0;
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}
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static int pcf85063_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
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int rc;
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u8 regs[7];
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/*
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* to accurately set the time, reset the divider chain and keep it in
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* reset state until all time/date registers are written
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*/
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rc = regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL1,
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PCF85063_REG_CTRL1_EXT_TEST |
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PCF85063_REG_CTRL1_STOP,
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PCF85063_REG_CTRL1_STOP);
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if (rc)
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return rc;
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/* hours, minutes and seconds */
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regs[0] = bin2bcd(tm->tm_sec) & 0x7F; /* clear OS flag */
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regs[1] = bin2bcd(tm->tm_min);
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regs[2] = bin2bcd(tm->tm_hour);
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/* Day of month, 1 - 31 */
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regs[3] = bin2bcd(tm->tm_mday);
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/* Day, 0 - 6 */
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regs[4] = tm->tm_wday & 0x07;
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/* month, 1 - 12 */
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regs[5] = bin2bcd(tm->tm_mon + 1);
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/* year and century */
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regs[6] = bin2bcd(tm->tm_year - 100);
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/* write all registers at once */
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rc = regmap_bulk_write(pcf85063->regmap, PCF85063_REG_SC,
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regs, sizeof(regs));
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if (rc)
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return rc;
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/*
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* Write the control register as a separate action since the size of
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* the register space is different between the PCF85063TP and
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* PCF85063A devices. The rollover point can not be used.
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*/
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return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL1,
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PCF85063_REG_CTRL1_STOP, 0);
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}
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static int pcf85063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
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u8 buf[4];
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unsigned int val;
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int ret;
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ret = regmap_bulk_read(pcf85063->regmap, PCF85063_REG_ALM_S,
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buf, sizeof(buf));
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if (ret)
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return ret;
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alrm->time.tm_sec = bcd2bin(buf[0]);
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alrm->time.tm_min = bcd2bin(buf[1]);
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alrm->time.tm_hour = bcd2bin(buf[2]);
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alrm->time.tm_mday = bcd2bin(buf[3]);
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ret = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &val);
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if (ret)
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return ret;
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alrm->enabled = !!(val & PCF85063_CTRL2_AIE);
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return 0;
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}
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static int pcf85063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
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u8 buf[5];
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int ret;
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buf[0] = bin2bcd(alrm->time.tm_sec);
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buf[1] = bin2bcd(alrm->time.tm_min);
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buf[2] = bin2bcd(alrm->time.tm_hour);
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buf[3] = bin2bcd(alrm->time.tm_mday);
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buf[4] = PCF85063_AEN; /* Do not match on week day */
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ret = regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
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PCF85063_CTRL2_AIE | PCF85063_CTRL2_AF, 0);
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if (ret)
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return ret;
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ret = regmap_bulk_write(pcf85063->regmap, PCF85063_REG_ALM_S,
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buf, sizeof(buf));
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if (ret)
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return ret;
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return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
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PCF85063_CTRL2_AIE | PCF85063_CTRL2_AF,
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alrm->enabled ? PCF85063_CTRL2_AIE | PCF85063_CTRL2_AF : PCF85063_CTRL2_AF);
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}
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static int pcf85063_rtc_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
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return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
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PCF85063_CTRL2_AIE,
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enabled ? PCF85063_CTRL2_AIE : 0);
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}
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static irqreturn_t pcf85063_rtc_handle_irq(int irq, void *dev_id)
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{
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struct pcf85063 *pcf85063 = dev_id;
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unsigned int val;
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int err;
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err = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &val);
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if (err)
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return IRQ_NONE;
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if (val & PCF85063_CTRL2_AF) {
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rtc_update_irq(pcf85063->rtc, 1, RTC_IRQF | RTC_AF);
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regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
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PCF85063_CTRL2_AIE | PCF85063_CTRL2_AF,
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0);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static int pcf85063_read_offset(struct device *dev, long *offset)
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{
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struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
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long val;
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u32 reg;
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int ret;
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ret = regmap_read(pcf85063->regmap, PCF85063_REG_OFFSET, ®);
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if (ret < 0)
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return ret;
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val = sign_extend32(reg & ~PCF85063_OFFSET_MODE,
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PCF85063_OFFSET_SIGN_BIT);
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if (reg & PCF85063_OFFSET_MODE)
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*offset = val * PCF85063_OFFSET_STEP1;
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else
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*offset = val * PCF85063_OFFSET_STEP0;
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return 0;
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}
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static int pcf85063_set_offset(struct device *dev, long offset)
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{
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struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
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s8 mode0, mode1, reg;
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unsigned int error0, error1;
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if (offset > PCF85063_OFFSET_STEP0 * 63)
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return -ERANGE;
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if (offset < PCF85063_OFFSET_STEP0 * -64)
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return -ERANGE;
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mode0 = DIV_ROUND_CLOSEST(offset, PCF85063_OFFSET_STEP0);
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mode1 = DIV_ROUND_CLOSEST(offset, PCF85063_OFFSET_STEP1);
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error0 = abs(offset - (mode0 * PCF85063_OFFSET_STEP0));
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error1 = abs(offset - (mode1 * PCF85063_OFFSET_STEP1));
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if (mode1 > 63 || mode1 < -64 || error0 < error1)
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reg = mode0 & ~PCF85063_OFFSET_MODE;
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else
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reg = mode1 | PCF85063_OFFSET_MODE;
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return regmap_write(pcf85063->regmap, PCF85063_REG_OFFSET, reg);
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}
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static int pcf85063_ioctl(struct device *dev, unsigned int cmd,
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unsigned long arg)
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{
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struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
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int status, ret = 0;
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switch (cmd) {
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case RTC_VL_READ:
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ret = regmap_read(pcf85063->regmap, PCF85063_REG_SC, &status);
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if (ret < 0)
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return ret;
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status = (status & PCF85063_REG_SC_OS) ? RTC_VL_DATA_INVALID : 0;
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return put_user(status, (unsigned int __user *)arg);
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default:
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return -ENOIOCTLCMD;
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}
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}
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static const struct rtc_class_ops pcf85063_rtc_ops = {
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.read_time = pcf85063_rtc_read_time,
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.set_time = pcf85063_rtc_set_time,
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.read_offset = pcf85063_read_offset,
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.set_offset = pcf85063_set_offset,
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.read_alarm = pcf85063_rtc_read_alarm,
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.set_alarm = pcf85063_rtc_set_alarm,
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.alarm_irq_enable = pcf85063_rtc_alarm_irq_enable,
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.ioctl = pcf85063_ioctl,
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};
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static int pcf85063_nvmem_read(void *priv, unsigned int offset,
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void *val, size_t bytes)
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{
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return regmap_read(priv, PCF85063_REG_RAM, val);
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}
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static int pcf85063_nvmem_write(void *priv, unsigned int offset,
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void *val, size_t bytes)
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{
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return regmap_write(priv, PCF85063_REG_RAM, *(u8 *)val);
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}
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static int pcf85063_load_capacitance(struct pcf85063 *pcf85063,
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const struct device_node *np,
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unsigned int force_cap)
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{
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u32 load = 7000;
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u8 reg = 0;
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if (force_cap)
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load = force_cap;
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else
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of_property_read_u32(np, "quartz-load-femtofarads", &load);
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switch (load) {
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default:
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dev_warn(&pcf85063->rtc->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 7000",
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load);
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fallthrough;
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case 7000:
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break;
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case 12500:
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reg = PCF85063_REG_CTRL1_CAP_SEL;
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break;
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}
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return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL1,
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PCF85063_REG_CTRL1_CAP_SEL, reg);
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}
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#ifdef CONFIG_COMMON_CLK
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/*
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* Handling of the clkout
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*/
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#define clkout_hw_to_pcf85063(_hw) container_of(_hw, struct pcf85063, clkout_hw)
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static int clkout_rates[] = {
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32768,
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16384,
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8192,
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4096,
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2048,
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1024,
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1,
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0
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};
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static unsigned long pcf85063_clkout_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
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unsigned int buf;
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int ret = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &buf);
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if (ret < 0)
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return 0;
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buf &= PCF85063_REG_CLKO_F_MASK;
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return clkout_rates[buf];
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}
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static long pcf85063_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
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if (clkout_rates[i] <= rate)
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return clkout_rates[i];
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return 0;
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}
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static int pcf85063_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
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int i;
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for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
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if (clkout_rates[i] == rate)
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return regmap_update_bits(pcf85063->regmap,
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PCF85063_REG_CTRL2,
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PCF85063_REG_CLKO_F_MASK, i);
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return -EINVAL;
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}
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static int pcf85063_clkout_control(struct clk_hw *hw, bool enable)
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{
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struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
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unsigned int buf;
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int ret;
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ret = regmap_read(pcf85063->regmap, PCF85063_REG_OFFSET, &buf);
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if (ret < 0)
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return ret;
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buf &= PCF85063_REG_CLKO_F_MASK;
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if (enable) {
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if (buf == PCF85063_REG_CLKO_F_OFF)
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buf = PCF85063_REG_CLKO_F_32768HZ;
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else
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return 0;
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} else {
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if (buf != PCF85063_REG_CLKO_F_OFF)
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buf = PCF85063_REG_CLKO_F_OFF;
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else
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return 0;
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}
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return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
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PCF85063_REG_CLKO_F_MASK, buf);
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}
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static int pcf85063_clkout_prepare(struct clk_hw *hw)
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{
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return pcf85063_clkout_control(hw, 1);
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}
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static void pcf85063_clkout_unprepare(struct clk_hw *hw)
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{
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pcf85063_clkout_control(hw, 0);
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}
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static int pcf85063_clkout_is_prepared(struct clk_hw *hw)
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{
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struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
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unsigned int buf;
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int ret = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &buf);
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if (ret < 0)
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return 0;
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return (buf & PCF85063_REG_CLKO_F_MASK) != PCF85063_REG_CLKO_F_OFF;
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}
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static const struct clk_ops pcf85063_clkout_ops = {
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.prepare = pcf85063_clkout_prepare,
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.unprepare = pcf85063_clkout_unprepare,
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.is_prepared = pcf85063_clkout_is_prepared,
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.recalc_rate = pcf85063_clkout_recalc_rate,
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.round_rate = pcf85063_clkout_round_rate,
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.set_rate = pcf85063_clkout_set_rate,
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};
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static struct clk *pcf85063_clkout_register_clk(struct pcf85063 *pcf85063)
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{
|
|
struct clk *clk;
|
|
struct clk_init_data init;
|
|
struct device_node *node = pcf85063->rtc->dev.parent->of_node;
|
|
struct device_node *fixed_clock;
|
|
|
|
fixed_clock = of_get_child_by_name(node, "clock");
|
|
if (fixed_clock) {
|
|
/*
|
|
* skip registering square wave clock when a fixed
|
|
* clock has been registered. The fixed clock is
|
|
* registered automatically when being referenced.
|
|
*/
|
|
of_node_put(fixed_clock);
|
|
return NULL;
|
|
}
|
|
|
|
init.name = "pcf85063-clkout";
|
|
init.ops = &pcf85063_clkout_ops;
|
|
init.flags = 0;
|
|
init.parent_names = NULL;
|
|
init.num_parents = 0;
|
|
pcf85063->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(&pcf85063->rtc->dev, &pcf85063->clkout_hw);
|
|
|
|
if (!IS_ERR(clk))
|
|
of_clk_add_provider(node, of_clk_src_simple_get, clk);
|
|
|
|
return clk;
|
|
}
|
|
#endif
|
|
|
|
enum pcf85063_type {
|
|
PCF85063,
|
|
PCF85063TP,
|
|
PCF85063A,
|
|
RV8263,
|
|
PCF85063_LAST_ID
|
|
};
|
|
|
|
static struct pcf85063_config pcf85063_cfg[] = {
|
|
[PCF85063] = {
|
|
.regmap = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = 0x0a,
|
|
},
|
|
},
|
|
[PCF85063TP] = {
|
|
.regmap = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = 0x0a,
|
|
},
|
|
},
|
|
[PCF85063A] = {
|
|
.regmap = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = 0x11,
|
|
},
|
|
.has_alarms = 1,
|
|
},
|
|
[RV8263] = {
|
|
.regmap = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = 0x11,
|
|
},
|
|
.has_alarms = 1,
|
|
.force_cap_7000 = 1,
|
|
},
|
|
};
|
|
|
|
static const struct i2c_device_id pcf85063_ids[];
|
|
|
|
static int pcf85063_probe(struct i2c_client *client)
|
|
{
|
|
struct pcf85063 *pcf85063;
|
|
unsigned int tmp;
|
|
int err;
|
|
const struct pcf85063_config *config;
|
|
struct nvmem_config nvmem_cfg = {
|
|
.name = "pcf85063_nvram",
|
|
.reg_read = pcf85063_nvmem_read,
|
|
.reg_write = pcf85063_nvmem_write,
|
|
.type = NVMEM_TYPE_BATTERY_BACKED,
|
|
.size = 1,
|
|
};
|
|
|
|
dev_dbg(&client->dev, "%s\n", __func__);
|
|
|
|
pcf85063 = devm_kzalloc(&client->dev, sizeof(struct pcf85063),
|
|
GFP_KERNEL);
|
|
if (!pcf85063)
|
|
return -ENOMEM;
|
|
|
|
if (client->dev.of_node) {
|
|
config = of_device_get_match_data(&client->dev);
|
|
if (!config)
|
|
return -ENODEV;
|
|
} else {
|
|
enum pcf85063_type type =
|
|
i2c_match_id(pcf85063_ids, client)->driver_data;
|
|
if (type >= PCF85063_LAST_ID)
|
|
return -ENODEV;
|
|
config = &pcf85063_cfg[type];
|
|
}
|
|
|
|
pcf85063->regmap = devm_regmap_init_i2c(client, &config->regmap);
|
|
if (IS_ERR(pcf85063->regmap))
|
|
return PTR_ERR(pcf85063->regmap);
|
|
|
|
i2c_set_clientdata(client, pcf85063);
|
|
|
|
err = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL1, &tmp);
|
|
if (err) {
|
|
dev_err(&client->dev, "RTC chip is not present\n");
|
|
return err;
|
|
}
|
|
|
|
pcf85063->rtc = devm_rtc_allocate_device(&client->dev);
|
|
if (IS_ERR(pcf85063->rtc))
|
|
return PTR_ERR(pcf85063->rtc);
|
|
|
|
err = pcf85063_load_capacitance(pcf85063, client->dev.of_node,
|
|
config->force_cap_7000 ? 7000 : 0);
|
|
if (err < 0)
|
|
dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
|
|
err);
|
|
|
|
pcf85063->rtc->ops = &pcf85063_rtc_ops;
|
|
pcf85063->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
|
|
pcf85063->rtc->range_max = RTC_TIMESTAMP_END_2099;
|
|
set_bit(RTC_FEATURE_ALARM_RES_2S, pcf85063->rtc->features);
|
|
clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, pcf85063->rtc->features);
|
|
clear_bit(RTC_FEATURE_ALARM, pcf85063->rtc->features);
|
|
|
|
if (config->has_alarms && client->irq > 0) {
|
|
err = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, pcf85063_rtc_handle_irq,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
|
"pcf85063", pcf85063);
|
|
if (err) {
|
|
dev_warn(&pcf85063->rtc->dev,
|
|
"unable to request IRQ, alarms disabled\n");
|
|
} else {
|
|
set_bit(RTC_FEATURE_ALARM, pcf85063->rtc->features);
|
|
device_init_wakeup(&client->dev, true);
|
|
err = dev_pm_set_wake_irq(&client->dev, client->irq);
|
|
if (err)
|
|
dev_err(&pcf85063->rtc->dev,
|
|
"failed to enable irq wake\n");
|
|
}
|
|
}
|
|
|
|
nvmem_cfg.priv = pcf85063->regmap;
|
|
devm_rtc_nvmem_register(pcf85063->rtc, &nvmem_cfg);
|
|
|
|
#ifdef CONFIG_COMMON_CLK
|
|
/* register clk in common clk framework */
|
|
pcf85063_clkout_register_clk(pcf85063);
|
|
#endif
|
|
|
|
return devm_rtc_register_device(pcf85063->rtc);
|
|
}
|
|
|
|
static const struct i2c_device_id pcf85063_ids[] = {
|
|
{ "pcf85063", PCF85063 },
|
|
{ "pcf85063tp", PCF85063TP },
|
|
{ "pcf85063a", PCF85063A },
|
|
{ "rv8263", RV8263 },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, pcf85063_ids);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id pcf85063_of_match[] = {
|
|
{ .compatible = "nxp,pcf85063", .data = &pcf85063_cfg[PCF85063] },
|
|
{ .compatible = "nxp,pcf85063tp", .data = &pcf85063_cfg[PCF85063TP] },
|
|
{ .compatible = "nxp,pcf85063a", .data = &pcf85063_cfg[PCF85063A] },
|
|
{ .compatible = "microcrystal,rv8263", .data = &pcf85063_cfg[RV8263] },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, pcf85063_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver pcf85063_driver = {
|
|
.driver = {
|
|
.name = "rtc-pcf85063",
|
|
.of_match_table = of_match_ptr(pcf85063_of_match),
|
|
},
|
|
.probe_new = pcf85063_probe,
|
|
.id_table = pcf85063_ids,
|
|
};
|
|
|
|
module_i2c_driver(pcf85063_driver);
|
|
|
|
MODULE_AUTHOR("Søren Andersen <san@rosetechnology.dk>");
|
|
MODULE_DESCRIPTION("PCF85063 RTC driver");
|
|
MODULE_LICENSE("GPL");
|