382 lines
10 KiB
C
382 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Real Time Clock driver for Marvell 88PM860x PMIC
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*
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* Copyright (c) 2010 Marvell International Ltd.
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* Author: Haojian Zhuang <haojian.zhuang@marvell.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/rtc.h>
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#include <linux/delay.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/88pm860x.h>
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#define VRTC_CALIBRATION
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struct pm860x_rtc_info {
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struct pm860x_chip *chip;
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struct i2c_client *i2c;
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struct rtc_device *rtc_dev;
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struct device *dev;
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struct delayed_work calib_work;
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int irq;
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int vrtc;
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};
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#define REG_VRTC_MEAS1 0x7D
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#define REG0_ADDR 0xB0
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#define REG1_ADDR 0xB2
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#define REG2_ADDR 0xB4
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#define REG3_ADDR 0xB6
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#define REG0_DATA 0xB1
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#define REG1_DATA 0xB3
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#define REG2_DATA 0xB5
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#define REG3_DATA 0xB7
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/* bit definitions of Measurement Enable Register 2 (0x51) */
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#define MEAS2_VRTC (1 << 0)
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/* bit definitions of RTC Register 1 (0xA0) */
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#define ALARM_EN (1 << 3)
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#define ALARM_WAKEUP (1 << 4)
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#define ALARM (1 << 5)
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#define RTC1_USE_XO (1 << 7)
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#define VRTC_CALIB_INTERVAL (HZ * 60 * 10) /* 10 minutes */
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static irqreturn_t rtc_update_handler(int irq, void *data)
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{
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struct pm860x_rtc_info *info = (struct pm860x_rtc_info *)data;
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int mask;
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mask = ALARM | ALARM_WAKEUP;
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pm860x_set_bits(info->i2c, PM8607_RTC1, mask | ALARM_EN, mask);
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rtc_update_irq(info->rtc_dev, 1, RTC_AF);
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return IRQ_HANDLED;
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}
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static int pm860x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct pm860x_rtc_info *info = dev_get_drvdata(dev);
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if (enabled)
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pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, ALARM_EN);
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else
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pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);
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return 0;
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}
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static int pm860x_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct pm860x_rtc_info *info = dev_get_drvdata(dev);
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unsigned char buf[8];
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unsigned long ticks, base, data;
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pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
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dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
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buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
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base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
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(buf[5] << 8) | buf[7];
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/* load 32-bit read-only counter */
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pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
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data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
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(buf[1] << 8) | buf[0];
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ticks = base + data;
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dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
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base, data, ticks);
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rtc_time64_to_tm(ticks, tm);
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return 0;
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}
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static int pm860x_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct pm860x_rtc_info *info = dev_get_drvdata(dev);
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unsigned char buf[4];
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unsigned long ticks, base, data;
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ticks = rtc_tm_to_time64(tm);
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/* load 32-bit read-only counter */
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pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
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data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
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(buf[1] << 8) | buf[0];
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base = ticks - data;
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dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
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base, data, ticks);
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pm860x_page_reg_write(info->i2c, REG0_DATA, (base >> 24) & 0xFF);
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pm860x_page_reg_write(info->i2c, REG1_DATA, (base >> 16) & 0xFF);
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pm860x_page_reg_write(info->i2c, REG2_DATA, (base >> 8) & 0xFF);
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pm860x_page_reg_write(info->i2c, REG3_DATA, base & 0xFF);
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return 0;
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}
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static int pm860x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pm860x_rtc_info *info = dev_get_drvdata(dev);
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unsigned char buf[8];
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unsigned long ticks, base, data;
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int ret;
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pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
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dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
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buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
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base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
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(buf[5] << 8) | buf[7];
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pm860x_bulk_read(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
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data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
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(buf[1] << 8) | buf[0];
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ticks = base + data;
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dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
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base, data, ticks);
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rtc_time64_to_tm(ticks, &alrm->time);
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ret = pm860x_reg_read(info->i2c, PM8607_RTC1);
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alrm->enabled = (ret & ALARM_EN) ? 1 : 0;
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alrm->pending = (ret & (ALARM | ALARM_WAKEUP)) ? 1 : 0;
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return 0;
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}
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static int pm860x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pm860x_rtc_info *info = dev_get_drvdata(dev);
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unsigned long ticks, base, data;
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unsigned char buf[8];
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int mask;
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pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);
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pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
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dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
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buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
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base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
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(buf[5] << 8) | buf[7];
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ticks = rtc_tm_to_time64(&alrm->time);
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data = ticks - base;
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buf[0] = data & 0xff;
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buf[1] = (data >> 8) & 0xff;
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buf[2] = (data >> 16) & 0xff;
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buf[3] = (data >> 24) & 0xff;
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pm860x_bulk_write(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
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if (alrm->enabled) {
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mask = ALARM | ALARM_WAKEUP | ALARM_EN;
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pm860x_set_bits(info->i2c, PM8607_RTC1, mask, mask);
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} else {
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mask = ALARM | ALARM_WAKEUP | ALARM_EN;
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pm860x_set_bits(info->i2c, PM8607_RTC1, mask,
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ALARM | ALARM_WAKEUP);
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}
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return 0;
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}
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static const struct rtc_class_ops pm860x_rtc_ops = {
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.read_time = pm860x_rtc_read_time,
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.set_time = pm860x_rtc_set_time,
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.read_alarm = pm860x_rtc_read_alarm,
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.set_alarm = pm860x_rtc_set_alarm,
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.alarm_irq_enable = pm860x_rtc_alarm_irq_enable,
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};
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#ifdef VRTC_CALIBRATION
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static void calibrate_vrtc_work(struct work_struct *work)
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{
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struct pm860x_rtc_info *info = container_of(work,
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struct pm860x_rtc_info, calib_work.work);
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unsigned char buf[2];
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unsigned int sum, data, mean, vrtc_set;
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int i;
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for (i = 0, sum = 0; i < 16; i++) {
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msleep(100);
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pm860x_bulk_read(info->i2c, REG_VRTC_MEAS1, 2, buf);
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data = (buf[0] << 4) | buf[1];
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data = (data * 5400) >> 12; /* convert to mv */
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sum += data;
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}
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mean = sum >> 4;
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vrtc_set = 2700 + (info->vrtc & 0x3) * 200;
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dev_dbg(info->dev, "mean:%d, vrtc_set:%d\n", mean, vrtc_set);
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sum = pm860x_reg_read(info->i2c, PM8607_RTC_MISC1);
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data = sum & 0x3;
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if ((mean + 200) < vrtc_set) {
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/* try higher voltage */
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if (++data == 4)
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goto out;
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data = (sum & 0xf8) | (data & 0x3);
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pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
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} else if ((mean - 200) > vrtc_set) {
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/* try lower voltage */
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if (data-- == 0)
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goto out;
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data = (sum & 0xf8) | (data & 0x3);
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pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
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} else
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goto out;
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dev_dbg(info->dev, "set 0x%x to RTC_MISC1\n", data);
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/* trigger next calibration since VRTC is updated */
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schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
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return;
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out:
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/* disable measurement */
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pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
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dev_dbg(info->dev, "finish VRTC calibration\n");
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return;
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}
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#endif
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#ifdef CONFIG_OF
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static int pm860x_rtc_dt_init(struct platform_device *pdev,
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struct pm860x_rtc_info *info)
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{
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struct device_node *np = pdev->dev.parent->of_node;
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int ret;
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if (!np)
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return -ENODEV;
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np = of_get_child_by_name(np, "rtc");
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if (!np) {
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dev_err(&pdev->dev, "failed to find rtc node\n");
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return -ENODEV;
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}
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ret = of_property_read_u32(np, "marvell,88pm860x-vrtc", &info->vrtc);
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if (ret)
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info->vrtc = 0;
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of_node_put(np);
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return 0;
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}
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#else
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#define pm860x_rtc_dt_init(x, y) do { } while (0)
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#endif
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static int pm860x_rtc_probe(struct platform_device *pdev)
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{
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struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
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struct pm860x_rtc_info *info;
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int ret;
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info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_rtc_info),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->irq = platform_get_irq(pdev, 0);
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if (info->irq < 0)
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return info->irq;
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info->chip = chip;
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info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
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info->dev = &pdev->dev;
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dev_set_drvdata(&pdev->dev, info);
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info->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(info->rtc_dev))
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return PTR_ERR(info->rtc_dev);
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ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
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rtc_update_handler, IRQF_ONESHOT, "rtc",
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info);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
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info->irq, ret);
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return ret;
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}
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/* set addresses of 32-bit base value for RTC time */
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pm860x_page_reg_write(info->i2c, REG0_ADDR, REG0_DATA);
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pm860x_page_reg_write(info->i2c, REG1_ADDR, REG1_DATA);
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pm860x_page_reg_write(info->i2c, REG2_ADDR, REG2_DATA);
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pm860x_page_reg_write(info->i2c, REG3_ADDR, REG3_DATA);
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pm860x_rtc_dt_init(pdev, info);
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info->rtc_dev->ops = &pm860x_rtc_ops;
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info->rtc_dev->range_max = U32_MAX;
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ret = devm_rtc_register_device(info->rtc_dev);
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if (ret)
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return ret;
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/*
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* enable internal XO instead of internal 3.25MHz clock since it can
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* free running in PMIC power-down state.
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*/
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pm860x_set_bits(info->i2c, PM8607_RTC1, RTC1_USE_XO, RTC1_USE_XO);
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#ifdef VRTC_CALIBRATION
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/* <00> -- 2.7V, <01> -- 2.9V, <10> -- 3.1V, <11> -- 3.3V */
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pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, MEAS2_VRTC);
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/* calibrate VRTC */
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INIT_DELAYED_WORK(&info->calib_work, calibrate_vrtc_work);
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schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
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#endif /* VRTC_CALIBRATION */
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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}
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static void pm860x_rtc_remove(struct platform_device *pdev)
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{
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struct pm860x_rtc_info *info = platform_get_drvdata(pdev);
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#ifdef VRTC_CALIBRATION
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cancel_delayed_work_sync(&info->calib_work);
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/* disable measurement */
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pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
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#endif /* VRTC_CALIBRATION */
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}
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#ifdef CONFIG_PM_SLEEP
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static int pm860x_rtc_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
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if (device_may_wakeup(dev))
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chip->wakeup_flag |= 1 << PM8607_IRQ_RTC;
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return 0;
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}
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static int pm860x_rtc_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
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if (device_may_wakeup(dev))
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chip->wakeup_flag &= ~(1 << PM8607_IRQ_RTC);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(pm860x_rtc_pm_ops, pm860x_rtc_suspend, pm860x_rtc_resume);
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static struct platform_driver pm860x_rtc_driver = {
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.driver = {
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.name = "88pm860x-rtc",
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.pm = &pm860x_rtc_pm_ops,
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},
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.probe = pm860x_rtc_probe,
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.remove_new = pm860x_rtc_remove,
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};
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module_platform_driver(pm860x_rtc_driver);
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MODULE_DESCRIPTION("Marvell 88PM860x RTC driver");
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MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
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MODULE_LICENSE("GPL");
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