1008b3040SHaojian Zhuang /* 2008b3040SHaojian Zhuang * Real Time Clock driver for Marvell 88PM860x PMIC 3008b3040SHaojian Zhuang * 4008b3040SHaojian Zhuang * Copyright (c) 2010 Marvell International Ltd. 5008b3040SHaojian Zhuang * Author: Haojian Zhuang <haojian.zhuang@marvell.com> 6008b3040SHaojian Zhuang * 7008b3040SHaojian Zhuang * This program is free software; you can redistribute it and/or modify 8008b3040SHaojian Zhuang * it under the terms of the GNU General Public License version 2 as 9008b3040SHaojian Zhuang * published by the Free Software Foundation. 10008b3040SHaojian Zhuang */ 11008b3040SHaojian Zhuang 12008b3040SHaojian Zhuang #include <linux/kernel.h> 13008b3040SHaojian Zhuang #include <linux/module.h> 142e57d567SHaojian Zhuang #include <linux/of.h> 15008b3040SHaojian Zhuang #include <linux/platform_device.h> 16008b3040SHaojian Zhuang #include <linux/slab.h> 17008b3040SHaojian Zhuang #include <linux/mutex.h> 18008b3040SHaojian Zhuang #include <linux/rtc.h> 19008b3040SHaojian Zhuang #include <linux/delay.h> 20008b3040SHaojian Zhuang #include <linux/mfd/core.h> 21008b3040SHaojian Zhuang #include <linux/mfd/88pm860x.h> 22008b3040SHaojian Zhuang 23008b3040SHaojian Zhuang #define VRTC_CALIBRATION 24008b3040SHaojian Zhuang 25008b3040SHaojian Zhuang struct pm860x_rtc_info { 26008b3040SHaojian Zhuang struct pm860x_chip *chip; 27008b3040SHaojian Zhuang struct i2c_client *i2c; 28008b3040SHaojian Zhuang struct rtc_device *rtc_dev; 29008b3040SHaojian Zhuang struct device *dev; 30008b3040SHaojian Zhuang struct delayed_work calib_work; 31008b3040SHaojian Zhuang 32008b3040SHaojian Zhuang int irq; 33008b3040SHaojian Zhuang int vrtc; 34008b3040SHaojian Zhuang int (*sync)(unsigned int ticks); 35008b3040SHaojian Zhuang }; 36008b3040SHaojian Zhuang 37008b3040SHaojian Zhuang #define REG_VRTC_MEAS1 0x7D 38008b3040SHaojian Zhuang 39008b3040SHaojian Zhuang #define REG0_ADDR 0xB0 40008b3040SHaojian Zhuang #define REG1_ADDR 0xB2 41008b3040SHaojian Zhuang #define REG2_ADDR 0xB4 42008b3040SHaojian Zhuang #define REG3_ADDR 0xB6 43008b3040SHaojian Zhuang 44008b3040SHaojian Zhuang #define REG0_DATA 0xB1 45008b3040SHaojian Zhuang #define REG1_DATA 0xB3 46008b3040SHaojian Zhuang #define REG2_DATA 0xB5 47008b3040SHaojian Zhuang #define REG3_DATA 0xB7 48008b3040SHaojian Zhuang 49008b3040SHaojian Zhuang /* bit definitions of Measurement Enable Register 2 (0x51) */ 50008b3040SHaojian Zhuang #define MEAS2_VRTC (1 << 0) 51008b3040SHaojian Zhuang 52008b3040SHaojian Zhuang /* bit definitions of RTC Register 1 (0xA0) */ 53008b3040SHaojian Zhuang #define ALARM_EN (1 << 3) 54008b3040SHaojian Zhuang #define ALARM_WAKEUP (1 << 4) 55008b3040SHaojian Zhuang #define ALARM (1 << 5) 56008b3040SHaojian Zhuang #define RTC1_USE_XO (1 << 7) 57008b3040SHaojian Zhuang 58008b3040SHaojian Zhuang #define VRTC_CALIB_INTERVAL (HZ * 60 * 10) /* 10 minutes */ 59008b3040SHaojian Zhuang 60008b3040SHaojian Zhuang static irqreturn_t rtc_update_handler(int irq, void *data) 61008b3040SHaojian Zhuang { 62008b3040SHaojian Zhuang struct pm860x_rtc_info *info = (struct pm860x_rtc_info *)data; 63008b3040SHaojian Zhuang int mask; 64008b3040SHaojian Zhuang 65008b3040SHaojian Zhuang mask = ALARM | ALARM_WAKEUP; 66008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_RTC1, mask | ALARM_EN, mask); 67008b3040SHaojian Zhuang rtc_update_irq(info->rtc_dev, 1, RTC_AF); 68008b3040SHaojian Zhuang return IRQ_HANDLED; 69008b3040SHaojian Zhuang } 70008b3040SHaojian Zhuang 71008b3040SHaojian Zhuang static int pm860x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) 72008b3040SHaojian Zhuang { 73008b3040SHaojian Zhuang struct pm860x_rtc_info *info = dev_get_drvdata(dev); 74008b3040SHaojian Zhuang 75008b3040SHaojian Zhuang if (enabled) 76fd835d1fSJett.Zhou pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, ALARM_EN); 77008b3040SHaojian Zhuang else 78fd835d1fSJett.Zhou pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0); 79008b3040SHaojian Zhuang return 0; 80008b3040SHaojian Zhuang } 81008b3040SHaojian Zhuang 82008b3040SHaojian Zhuang /* 83008b3040SHaojian Zhuang * Calculate the next alarm time given the requested alarm time mask 84008b3040SHaojian Zhuang * and the current time. 85008b3040SHaojian Zhuang */ 86008b3040SHaojian Zhuang static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, 87008b3040SHaojian Zhuang struct rtc_time *alrm) 88008b3040SHaojian Zhuang { 89008b3040SHaojian Zhuang unsigned long next_time; 90008b3040SHaojian Zhuang unsigned long now_time; 91008b3040SHaojian Zhuang 92008b3040SHaojian Zhuang next->tm_year = now->tm_year; 93008b3040SHaojian Zhuang next->tm_mon = now->tm_mon; 94008b3040SHaojian Zhuang next->tm_mday = now->tm_mday; 95008b3040SHaojian Zhuang next->tm_hour = alrm->tm_hour; 96008b3040SHaojian Zhuang next->tm_min = alrm->tm_min; 97008b3040SHaojian Zhuang next->tm_sec = alrm->tm_sec; 98008b3040SHaojian Zhuang 99008b3040SHaojian Zhuang rtc_tm_to_time(now, &now_time); 100008b3040SHaojian Zhuang rtc_tm_to_time(next, &next_time); 101008b3040SHaojian Zhuang 102008b3040SHaojian Zhuang if (next_time < now_time) { 103008b3040SHaojian Zhuang /* Advance one day */ 104008b3040SHaojian Zhuang next_time += 60 * 60 * 24; 105008b3040SHaojian Zhuang rtc_time_to_tm(next_time, next); 106008b3040SHaojian Zhuang } 107008b3040SHaojian Zhuang } 108008b3040SHaojian Zhuang 109008b3040SHaojian Zhuang static int pm860x_rtc_read_time(struct device *dev, struct rtc_time *tm) 110008b3040SHaojian Zhuang { 111008b3040SHaojian Zhuang struct pm860x_rtc_info *info = dev_get_drvdata(dev); 112008b3040SHaojian Zhuang unsigned char buf[8]; 113008b3040SHaojian Zhuang unsigned long ticks, base, data; 114008b3040SHaojian Zhuang 115008b3040SHaojian Zhuang pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf); 116008b3040SHaojian Zhuang dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1], 117008b3040SHaojian Zhuang buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]); 118008b3040SHaojian Zhuang base = (buf[1] << 24) | (buf[3] << 16) | (buf[5] << 8) | buf[7]; 119008b3040SHaojian Zhuang 120008b3040SHaojian Zhuang /* load 32-bit read-only counter */ 121008b3040SHaojian Zhuang pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf); 122008b3040SHaojian Zhuang data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; 123008b3040SHaojian Zhuang ticks = base + data; 124008b3040SHaojian Zhuang dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", 125008b3040SHaojian Zhuang base, data, ticks); 126008b3040SHaojian Zhuang 127008b3040SHaojian Zhuang rtc_time_to_tm(ticks, tm); 128008b3040SHaojian Zhuang 129008b3040SHaojian Zhuang return 0; 130008b3040SHaojian Zhuang } 131008b3040SHaojian Zhuang 132008b3040SHaojian Zhuang static int pm860x_rtc_set_time(struct device *dev, struct rtc_time *tm) 133008b3040SHaojian Zhuang { 134008b3040SHaojian Zhuang struct pm860x_rtc_info *info = dev_get_drvdata(dev); 135008b3040SHaojian Zhuang unsigned char buf[4]; 136008b3040SHaojian Zhuang unsigned long ticks, base, data; 137008b3040SHaojian Zhuang 138008b3040SHaojian Zhuang if ((tm->tm_year < 70) || (tm->tm_year > 138)) { 139008b3040SHaojian Zhuang dev_dbg(info->dev, "Set time %d out of range. " 140008b3040SHaojian Zhuang "Please set time between 1970 to 2038.\n", 141008b3040SHaojian Zhuang 1900 + tm->tm_year); 142008b3040SHaojian Zhuang return -EINVAL; 143008b3040SHaojian Zhuang } 144008b3040SHaojian Zhuang rtc_tm_to_time(tm, &ticks); 145008b3040SHaojian Zhuang 146008b3040SHaojian Zhuang /* load 32-bit read-only counter */ 147008b3040SHaojian Zhuang pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf); 148008b3040SHaojian Zhuang data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; 149008b3040SHaojian Zhuang base = ticks - data; 150008b3040SHaojian Zhuang dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", 151008b3040SHaojian Zhuang base, data, ticks); 152008b3040SHaojian Zhuang 153008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG0_DATA, (base >> 24) & 0xFF); 154008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG1_DATA, (base >> 16) & 0xFF); 155008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG2_DATA, (base >> 8) & 0xFF); 156008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG3_DATA, base & 0xFF); 157008b3040SHaojian Zhuang 158008b3040SHaojian Zhuang if (info->sync) 159008b3040SHaojian Zhuang info->sync(ticks); 160008b3040SHaojian Zhuang return 0; 161008b3040SHaojian Zhuang } 162008b3040SHaojian Zhuang 163008b3040SHaojian Zhuang static int pm860x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) 164008b3040SHaojian Zhuang { 165008b3040SHaojian Zhuang struct pm860x_rtc_info *info = dev_get_drvdata(dev); 166008b3040SHaojian Zhuang unsigned char buf[8]; 167008b3040SHaojian Zhuang unsigned long ticks, base, data; 168008b3040SHaojian Zhuang int ret; 169008b3040SHaojian Zhuang 170008b3040SHaojian Zhuang pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf); 171008b3040SHaojian Zhuang dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1], 172008b3040SHaojian Zhuang buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]); 173008b3040SHaojian Zhuang base = (buf[1] << 24) | (buf[3] << 16) | (buf[5] << 8) | buf[7]; 174008b3040SHaojian Zhuang 175008b3040SHaojian Zhuang pm860x_bulk_read(info->i2c, PM8607_RTC_EXPIRE1, 4, buf); 176008b3040SHaojian Zhuang data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; 177008b3040SHaojian Zhuang ticks = base + data; 178008b3040SHaojian Zhuang dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", 179008b3040SHaojian Zhuang base, data, ticks); 180008b3040SHaojian Zhuang 181008b3040SHaojian Zhuang rtc_time_to_tm(ticks, &alrm->time); 182008b3040SHaojian Zhuang ret = pm860x_reg_read(info->i2c, PM8607_RTC1); 183008b3040SHaojian Zhuang alrm->enabled = (ret & ALARM_EN) ? 1 : 0; 184008b3040SHaojian Zhuang alrm->pending = (ret & (ALARM | ALARM_WAKEUP)) ? 1 : 0; 185008b3040SHaojian Zhuang return 0; 186008b3040SHaojian Zhuang } 187008b3040SHaojian Zhuang 188008b3040SHaojian Zhuang static int pm860x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 189008b3040SHaojian Zhuang { 190008b3040SHaojian Zhuang struct pm860x_rtc_info *info = dev_get_drvdata(dev); 191008b3040SHaojian Zhuang struct rtc_time now_tm, alarm_tm; 192008b3040SHaojian Zhuang unsigned long ticks, base, data; 193008b3040SHaojian Zhuang unsigned char buf[8]; 194008b3040SHaojian Zhuang int mask; 195008b3040SHaojian Zhuang 196008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0); 197008b3040SHaojian Zhuang 198008b3040SHaojian Zhuang pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf); 199008b3040SHaojian Zhuang dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1], 200008b3040SHaojian Zhuang buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]); 201008b3040SHaojian Zhuang base = (buf[1] << 24) | (buf[3] << 16) | (buf[5] << 8) | buf[7]; 202008b3040SHaojian Zhuang 203008b3040SHaojian Zhuang /* load 32-bit read-only counter */ 204008b3040SHaojian Zhuang pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf); 205008b3040SHaojian Zhuang data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; 206008b3040SHaojian Zhuang ticks = base + data; 207008b3040SHaojian Zhuang dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", 208008b3040SHaojian Zhuang base, data, ticks); 209008b3040SHaojian Zhuang 210008b3040SHaojian Zhuang rtc_time_to_tm(ticks, &now_tm); 211008b3040SHaojian Zhuang rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time); 212008b3040SHaojian Zhuang /* get new ticks for alarm in 24 hours */ 213008b3040SHaojian Zhuang rtc_tm_to_time(&alarm_tm, &ticks); 214008b3040SHaojian Zhuang data = ticks - base; 215008b3040SHaojian Zhuang 216008b3040SHaojian Zhuang buf[0] = data & 0xff; 217008b3040SHaojian Zhuang buf[1] = (data >> 8) & 0xff; 218008b3040SHaojian Zhuang buf[2] = (data >> 16) & 0xff; 219008b3040SHaojian Zhuang buf[3] = (data >> 24) & 0xff; 220008b3040SHaojian Zhuang pm860x_bulk_write(info->i2c, PM8607_RTC_EXPIRE1, 4, buf); 221008b3040SHaojian Zhuang if (alrm->enabled) { 222008b3040SHaojian Zhuang mask = ALARM | ALARM_WAKEUP | ALARM_EN; 223008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_RTC1, mask, mask); 224008b3040SHaojian Zhuang } else { 225008b3040SHaojian Zhuang mask = ALARM | ALARM_WAKEUP | ALARM_EN; 226008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_RTC1, mask, 227008b3040SHaojian Zhuang ALARM | ALARM_WAKEUP); 228008b3040SHaojian Zhuang } 229008b3040SHaojian Zhuang return 0; 230008b3040SHaojian Zhuang } 231008b3040SHaojian Zhuang 232008b3040SHaojian Zhuang static const struct rtc_class_ops pm860x_rtc_ops = { 233008b3040SHaojian Zhuang .read_time = pm860x_rtc_read_time, 234008b3040SHaojian Zhuang .set_time = pm860x_rtc_set_time, 235008b3040SHaojian Zhuang .read_alarm = pm860x_rtc_read_alarm, 236008b3040SHaojian Zhuang .set_alarm = pm860x_rtc_set_alarm, 237008b3040SHaojian Zhuang .alarm_irq_enable = pm860x_rtc_alarm_irq_enable, 238008b3040SHaojian Zhuang }; 239008b3040SHaojian Zhuang 240008b3040SHaojian Zhuang #ifdef VRTC_CALIBRATION 241008b3040SHaojian Zhuang static void calibrate_vrtc_work(struct work_struct *work) 242008b3040SHaojian Zhuang { 243008b3040SHaojian Zhuang struct pm860x_rtc_info *info = container_of(work, 244008b3040SHaojian Zhuang struct pm860x_rtc_info, calib_work.work); 245008b3040SHaojian Zhuang unsigned char buf[2]; 246008b3040SHaojian Zhuang unsigned int sum, data, mean, vrtc_set; 247008b3040SHaojian Zhuang int i; 248008b3040SHaojian Zhuang 249008b3040SHaojian Zhuang for (i = 0, sum = 0; i < 16; i++) { 250008b3040SHaojian Zhuang msleep(100); 251008b3040SHaojian Zhuang pm860x_bulk_read(info->i2c, REG_VRTC_MEAS1, 2, buf); 252008b3040SHaojian Zhuang data = (buf[0] << 4) | buf[1]; 253008b3040SHaojian Zhuang data = (data * 5400) >> 12; /* convert to mv */ 254008b3040SHaojian Zhuang sum += data; 255008b3040SHaojian Zhuang } 256008b3040SHaojian Zhuang mean = sum >> 4; 257008b3040SHaojian Zhuang vrtc_set = 2700 + (info->vrtc & 0x3) * 200; 258008b3040SHaojian Zhuang dev_dbg(info->dev, "mean:%d, vrtc_set:%d\n", mean, vrtc_set); 259008b3040SHaojian Zhuang 260008b3040SHaojian Zhuang sum = pm860x_reg_read(info->i2c, PM8607_RTC_MISC1); 261008b3040SHaojian Zhuang data = sum & 0x3; 262008b3040SHaojian Zhuang if ((mean + 200) < vrtc_set) { 263008b3040SHaojian Zhuang /* try higher voltage */ 264008b3040SHaojian Zhuang if (++data == 4) 265008b3040SHaojian Zhuang goto out; 266008b3040SHaojian Zhuang data = (sum & 0xf8) | (data & 0x3); 267008b3040SHaojian Zhuang pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data); 268008b3040SHaojian Zhuang } else if ((mean - 200) > vrtc_set) { 269008b3040SHaojian Zhuang /* try lower voltage */ 270008b3040SHaojian Zhuang if (data-- == 0) 271008b3040SHaojian Zhuang goto out; 272008b3040SHaojian Zhuang data = (sum & 0xf8) | (data & 0x3); 273008b3040SHaojian Zhuang pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data); 274008b3040SHaojian Zhuang } else 275008b3040SHaojian Zhuang goto out; 276008b3040SHaojian Zhuang dev_dbg(info->dev, "set 0x%x to RTC_MISC1\n", data); 277008b3040SHaojian Zhuang /* trigger next calibration since VRTC is updated */ 278008b3040SHaojian Zhuang schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL); 279008b3040SHaojian Zhuang return; 280008b3040SHaojian Zhuang out: 281008b3040SHaojian Zhuang /* disable measurement */ 282008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0); 283008b3040SHaojian Zhuang dev_dbg(info->dev, "finish VRTC calibration\n"); 284008b3040SHaojian Zhuang return; 285008b3040SHaojian Zhuang } 286008b3040SHaojian Zhuang #endif 287008b3040SHaojian Zhuang 2882e57d567SHaojian Zhuang #ifdef CONFIG_OF 2895a167f45SGreg Kroah-Hartman static int pm860x_rtc_dt_init(struct platform_device *pdev, 2902e57d567SHaojian Zhuang struct pm860x_rtc_info *info) 2912e57d567SHaojian Zhuang { 2922e57d567SHaojian Zhuang struct device_node *np = pdev->dev.parent->of_node; 2932e57d567SHaojian Zhuang int ret; 2942e57d567SHaojian Zhuang if (!np) 2952e57d567SHaojian Zhuang return -ENODEV; 296e66040cbSKrzysztof Kozlowski np = of_get_child_by_name(np, "rtc"); 2972e57d567SHaojian Zhuang if (!np) { 2982e57d567SHaojian Zhuang dev_err(&pdev->dev, "failed to find rtc node\n"); 2992e57d567SHaojian Zhuang return -ENODEV; 3002e57d567SHaojian Zhuang } 3012e57d567SHaojian Zhuang ret = of_property_read_u32(np, "marvell,88pm860x-vrtc", &info->vrtc); 3022e57d567SHaojian Zhuang if (ret) 3032e57d567SHaojian Zhuang info->vrtc = 0; 3041e83d48bSKrzysztof Kozlowski of_node_put(np); 3052e57d567SHaojian Zhuang return 0; 3062e57d567SHaojian Zhuang } 3072e57d567SHaojian Zhuang #else 3082e57d567SHaojian Zhuang #define pm860x_rtc_dt_init(x, y) (-1) 3092e57d567SHaojian Zhuang #endif 3102e57d567SHaojian Zhuang 3115a167f45SGreg Kroah-Hartman static int pm860x_rtc_probe(struct platform_device *pdev) 312008b3040SHaojian Zhuang { 313008b3040SHaojian Zhuang struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 314008b3040SHaojian Zhuang struct pm860x_rtc_pdata *pdata = NULL; 315008b3040SHaojian Zhuang struct pm860x_rtc_info *info; 316008b3040SHaojian Zhuang struct rtc_time tm; 317008b3040SHaojian Zhuang unsigned long ticks = 0; 318008b3040SHaojian Zhuang int ret; 319008b3040SHaojian Zhuang 32082df0b28SJingoo Han pdata = dev_get_platdata(&pdev->dev); 321008b3040SHaojian Zhuang 3223087b3d0SSachin Kamat info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_rtc_info), 3233087b3d0SSachin Kamat GFP_KERNEL); 324008b3040SHaojian Zhuang if (!info) 325008b3040SHaojian Zhuang return -ENOMEM; 326008b3040SHaojian Zhuang info->irq = platform_get_irq(pdev, 0); 327008b3040SHaojian Zhuang if (info->irq < 0) { 328008b3040SHaojian Zhuang dev_err(&pdev->dev, "No IRQ resource!\n"); 3293087b3d0SSachin Kamat return info->irq; 330008b3040SHaojian Zhuang } 331008b3040SHaojian Zhuang 332008b3040SHaojian Zhuang info->chip = chip; 333008b3040SHaojian Zhuang info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion; 334008b3040SHaojian Zhuang info->dev = &pdev->dev; 335008b3040SHaojian Zhuang dev_set_drvdata(&pdev->dev, info); 336008b3040SHaojian Zhuang 3373087b3d0SSachin Kamat ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL, 3383087b3d0SSachin Kamat rtc_update_handler, IRQF_ONESHOT, "rtc", 3393087b3d0SSachin Kamat info); 340008b3040SHaojian Zhuang if (ret < 0) { 341008b3040SHaojian Zhuang dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", 342008b3040SHaojian Zhuang info->irq, ret); 3433087b3d0SSachin Kamat return ret; 344008b3040SHaojian Zhuang } 345008b3040SHaojian Zhuang 346008b3040SHaojian Zhuang /* set addresses of 32-bit base value for RTC time */ 347008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG0_ADDR, REG0_DATA); 348008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG1_ADDR, REG1_DATA); 349008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG2_ADDR, REG2_DATA); 350008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG3_ADDR, REG3_DATA); 351008b3040SHaojian Zhuang 352008b3040SHaojian Zhuang ret = pm860x_rtc_read_time(&pdev->dev, &tm); 353008b3040SHaojian Zhuang if (ret < 0) { 354008b3040SHaojian Zhuang dev_err(&pdev->dev, "Failed to read initial time.\n"); 3553087b3d0SSachin Kamat return ret; 356008b3040SHaojian Zhuang } 357008b3040SHaojian Zhuang if ((tm.tm_year < 70) || (tm.tm_year > 138)) { 358008b3040SHaojian Zhuang tm.tm_year = 70; 359008b3040SHaojian Zhuang tm.tm_mon = 0; 360008b3040SHaojian Zhuang tm.tm_mday = 1; 361008b3040SHaojian Zhuang tm.tm_hour = 0; 362008b3040SHaojian Zhuang tm.tm_min = 0; 363008b3040SHaojian Zhuang tm.tm_sec = 0; 364008b3040SHaojian Zhuang ret = pm860x_rtc_set_time(&pdev->dev, &tm); 365008b3040SHaojian Zhuang if (ret < 0) { 366008b3040SHaojian Zhuang dev_err(&pdev->dev, "Failed to set initial time.\n"); 3673087b3d0SSachin Kamat return ret; 368008b3040SHaojian Zhuang } 369008b3040SHaojian Zhuang } 370008b3040SHaojian Zhuang rtc_tm_to_time(&tm, &ticks); 3712e57d567SHaojian Zhuang if (pm860x_rtc_dt_init(pdev, info)) { 372008b3040SHaojian Zhuang if (pdata && pdata->sync) { 373008b3040SHaojian Zhuang pdata->sync(ticks); 374008b3040SHaojian Zhuang info->sync = pdata->sync; 375008b3040SHaojian Zhuang } 3762e57d567SHaojian Zhuang } 377008b3040SHaojian Zhuang 3783087b3d0SSachin Kamat info->rtc_dev = devm_rtc_device_register(&pdev->dev, "88pm860x-rtc", 379008b3040SHaojian Zhuang &pm860x_rtc_ops, THIS_MODULE); 380008b3040SHaojian Zhuang ret = PTR_ERR(info->rtc_dev); 381008b3040SHaojian Zhuang if (IS_ERR(info->rtc_dev)) { 382008b3040SHaojian Zhuang dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); 3833087b3d0SSachin Kamat return ret; 384008b3040SHaojian Zhuang } 385008b3040SHaojian Zhuang 386008b3040SHaojian Zhuang /* 387008b3040SHaojian Zhuang * enable internal XO instead of internal 3.25MHz clock since it can 388008b3040SHaojian Zhuang * free running in PMIC power-down state. 389008b3040SHaojian Zhuang */ 390008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_RTC1, RTC1_USE_XO, RTC1_USE_XO); 391008b3040SHaojian Zhuang 392008b3040SHaojian Zhuang #ifdef VRTC_CALIBRATION 393008b3040SHaojian Zhuang /* <00> -- 2.7V, <01> -- 2.9V, <10> -- 3.1V, <11> -- 3.3V */ 3942e57d567SHaojian Zhuang if (pm860x_rtc_dt_init(pdev, info)) { 395008b3040SHaojian Zhuang if (pdata && pdata->vrtc) 396008b3040SHaojian Zhuang info->vrtc = pdata->vrtc & 0x3; 397008b3040SHaojian Zhuang else 398008b3040SHaojian Zhuang info->vrtc = 1; 3992e57d567SHaojian Zhuang } 400008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, MEAS2_VRTC); 401008b3040SHaojian Zhuang 402008b3040SHaojian Zhuang /* calibrate VRTC */ 403008b3040SHaojian Zhuang INIT_DELAYED_WORK(&info->calib_work, calibrate_vrtc_work); 404008b3040SHaojian Zhuang schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL); 405008b3040SHaojian Zhuang #endif /* VRTC_CALIBRATION */ 4062853378bSJett.Zhou 4072853378bSJett.Zhou device_init_wakeup(&pdev->dev, 1); 4082853378bSJett.Zhou 409008b3040SHaojian Zhuang return 0; 410008b3040SHaojian Zhuang } 411008b3040SHaojian Zhuang 4125a167f45SGreg Kroah-Hartman static int pm860x_rtc_remove(struct platform_device *pdev) 413008b3040SHaojian Zhuang { 414008b3040SHaojian Zhuang struct pm860x_rtc_info *info = platform_get_drvdata(pdev); 415008b3040SHaojian Zhuang 416008b3040SHaojian Zhuang #ifdef VRTC_CALIBRATION 417008b3040SHaojian Zhuang flush_scheduled_work(); 418008b3040SHaojian Zhuang /* disable measurement */ 419008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0); 420008b3040SHaojian Zhuang #endif /* VRTC_CALIBRATION */ 421008b3040SHaojian Zhuang 422008b3040SHaojian Zhuang return 0; 423008b3040SHaojian Zhuang } 424008b3040SHaojian Zhuang 4252853378bSJett.Zhou #ifdef CONFIG_PM_SLEEP 4262853378bSJett.Zhou static int pm860x_rtc_suspend(struct device *dev) 4272853378bSJett.Zhou { 4282853378bSJett.Zhou struct platform_device *pdev = to_platform_device(dev); 4292853378bSJett.Zhou struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 4302853378bSJett.Zhou 4312853378bSJett.Zhou if (device_may_wakeup(dev)) 4322853378bSJett.Zhou chip->wakeup_flag |= 1 << PM8607_IRQ_RTC; 4332853378bSJett.Zhou return 0; 4342853378bSJett.Zhou } 4352853378bSJett.Zhou static int pm860x_rtc_resume(struct device *dev) 4362853378bSJett.Zhou { 4372853378bSJett.Zhou struct platform_device *pdev = to_platform_device(dev); 4382853378bSJett.Zhou struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 4392853378bSJett.Zhou 4402853378bSJett.Zhou if (device_may_wakeup(dev)) 4412853378bSJett.Zhou chip->wakeup_flag &= ~(1 << PM8607_IRQ_RTC); 4422853378bSJett.Zhou return 0; 4432853378bSJett.Zhou } 4442853378bSJett.Zhou #endif 4452853378bSJett.Zhou 4462853378bSJett.Zhou static SIMPLE_DEV_PM_OPS(pm860x_rtc_pm_ops, pm860x_rtc_suspend, pm860x_rtc_resume); 4472853378bSJett.Zhou 448008b3040SHaojian Zhuang static struct platform_driver pm860x_rtc_driver = { 449008b3040SHaojian Zhuang .driver = { 450008b3040SHaojian Zhuang .name = "88pm860x-rtc", 451008b3040SHaojian Zhuang .owner = THIS_MODULE, 4522853378bSJett.Zhou .pm = &pm860x_rtc_pm_ops, 453008b3040SHaojian Zhuang }, 454008b3040SHaojian Zhuang .probe = pm860x_rtc_probe, 4555a167f45SGreg Kroah-Hartman .remove = pm860x_rtc_remove, 456008b3040SHaojian Zhuang }; 457008b3040SHaojian Zhuang 4580c4eae66SAxel Lin module_platform_driver(pm860x_rtc_driver); 459008b3040SHaojian Zhuang 460008b3040SHaojian Zhuang MODULE_DESCRIPTION("Marvell 88PM860x RTC driver"); 461008b3040SHaojian Zhuang MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 462008b3040SHaojian Zhuang MODULE_LICENSE("GPL"); 463