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mfd: Add rtc support to 88pm860x
Enable rtc function in 88pm860x PMIC. Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Haojian Zhuang
Samuel Ortiz
parent
db13c04002
commit
008b30408c
5 changed files with 473 additions and 0 deletions
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@ -90,6 +90,10 @@ static struct resource charger_resources[] __devinitdata = {
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{PM8607_IRQ_VCHG, PM8607_IRQ_VCHG, "vchg voltage", IORESOURCE_IRQ,},
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};
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static struct resource rtc_resources[] __devinitdata = {
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{PM8607_IRQ_RTC, PM8607_IRQ_RTC, "rtc", IORESOURCE_IRQ,},
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};
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static struct mfd_cell bk_devs[] = {
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{"88pm860x-backlight", 0,},
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{"88pm860x-backlight", 1,},
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@ -143,6 +147,10 @@ static struct mfd_cell power_devs[] = {
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{"88pm860x-charger", -1,},
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};
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static struct mfd_cell rtc_devs[] = {
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{"88pm860x-rtc", -1,},
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};
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static struct pm860x_backlight_pdata bk_pdata[ARRAY_SIZE(bk_devs)];
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static struct pm860x_led_pdata led_pdata[ARRAY_SIZE(led_devs)];
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static struct regulator_init_data regulator_pdata[ARRAY_SIZE(regulator_devs)];
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@ -635,6 +643,26 @@ static void __devinit device_regulator_init(struct pm860x_chip *chip,
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return;
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}
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static void __devinit device_rtc_init(struct pm860x_chip *chip,
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struct i2c_client *i2c,
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struct pm860x_platform_data *pdata)
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{
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int ret;
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if ((pdata == NULL))
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return;
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rtc_devs[0].platform_data = pdata->rtc;
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rtc_devs[0].pdata_size = sizeof(struct pm860x_rtc_pdata);
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rtc_devs[0].num_resources = ARRAY_SIZE(rtc_resources);
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rtc_devs[0].resources = &rtc_resources[0];
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ret = mfd_add_devices(chip->dev, 0, &rtc_devs[0],
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ARRAY_SIZE(rtc_devs), &rtc_resources[0],
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chip->irq_base);
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if (ret < 0)
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dev_err(chip->dev, "Failed to add rtc subdev\n");
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}
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static void __devinit device_touch_init(struct pm860x_chip *chip,
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struct i2c_client *i2c,
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struct pm860x_platform_data *pdata)
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@ -770,6 +798,7 @@ static void __devinit device_8607_init(struct pm860x_chip *chip,
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goto out;
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device_regulator_init(chip, i2c, pdata);
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device_rtc_init(chip, i2c, pdata);
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device_onkey_init(chip, i2c, pdata);
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device_touch_init(chip, i2c, pdata);
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device_power_init(chip, i2c, pdata);
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@ -125,6 +125,16 @@ comment "I2C RTC drivers"
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if I2C
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config RTC_DRV_88PM860X
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tristate "Marvell 88PM860x"
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depends on RTC_CLASS && I2C && MFD_88PM860X
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help
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If you say yes here you get support for RTC function in Marvell
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88PM860x chips.
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This driver can also be built as a module. If so, the module
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will be called rtc-88pm860x.
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config RTC_DRV_DS1307
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tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
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help
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@ -15,6 +15,7 @@ rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
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# Keep the list ordered.
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obj-$(CONFIG_RTC_DRV_88PM860X) += rtc-88pm860x.o
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obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o
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obj-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o
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obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o
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427
drivers/rtc/rtc-88pm860x.c
Normal file
427
drivers/rtc/rtc-88pm860x.c
Normal file
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@ -0,0 +1,427 @@
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/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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int (*sync)(unsigned int ticks);
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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, ALARM);
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else
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pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM, 0);
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return 0;
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}
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/*
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* Calculate the next alarm time given the requested alarm time mask
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* and the current time.
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*/
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static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
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struct rtc_time *alrm)
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{
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unsigned long next_time;
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unsigned long now_time;
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next->tm_year = now->tm_year;
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next->tm_mon = now->tm_mon;
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next->tm_mday = now->tm_mday;
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next->tm_hour = alrm->tm_hour;
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next->tm_min = alrm->tm_min;
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next->tm_sec = alrm->tm_sec;
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rtc_tm_to_time(now, &now_time);
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rtc_tm_to_time(next, &next_time);
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if (next_time < now_time) {
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/* Advance one day */
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next_time += 60 * 60 * 24;
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rtc_time_to_tm(next_time, next);
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}
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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 = (buf[1] << 24) | (buf[3] << 16) | (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 = (buf[3] << 24) | (buf[2] << 16) | (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_time_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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if ((tm->tm_year < 70) || (tm->tm_year > 138)) {
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dev_dbg(info->dev, "Set time %d out of range. "
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"Please set time between 1970 to 2038.\n",
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1900 + tm->tm_year);
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return -EINVAL;
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}
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rtc_tm_to_time(tm, &ticks);
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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 = (buf[3] << 24) | (buf[2] << 16) | (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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if (info->sync)
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info->sync(ticks);
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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 = (buf[1] << 24) | (buf[3] << 16) | (buf[5] << 8) | buf[7];
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pm860x_bulk_read(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
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data = (buf[3] << 24) | (buf[2] << 16) | (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_time_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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struct rtc_time now_tm, alarm_tm;
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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 = (buf[1] << 24) | (buf[3] << 16) | (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 = (buf[3] << 24) | (buf[2] << 16) | (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_time_to_tm(ticks, &now_tm);
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rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time);
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/* get new ticks for alarm in 24 hours */
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rtc_tm_to_time(&alarm_tm, &ticks);
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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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static int __devinit 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_pdata *pdata = NULL;
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struct pm860x_rtc_info *info;
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struct rtc_time tm;
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unsigned long ticks = 0;
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int ret;
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pdata = pdev->dev.platform_data;
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if (pdata == NULL)
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dev_warn(&pdev->dev, "No platform data!\n");
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info = kzalloc(sizeof(struct pm860x_rtc_info), 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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dev_err(&pdev->dev, "No IRQ resource!\n");
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ret = -EINVAL;
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goto out;
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}
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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;
|
||||
dev_set_drvdata(&pdev->dev, info);
|
||||
|
||||
ret = request_threaded_irq(info->irq, NULL, rtc_update_handler,
|
||||
IRQF_ONESHOT, "rtc", info);
|
||||
if (ret < 0) {
|
||||
dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
|
||||
info->irq, ret);
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* set addresses of 32-bit base value for RTC time */
|
||||
pm860x_page_reg_write(info->i2c, REG0_ADDR, REG0_DATA);
|
||||
pm860x_page_reg_write(info->i2c, REG1_ADDR, REG1_DATA);
|
||||
pm860x_page_reg_write(info->i2c, REG2_ADDR, REG2_DATA);
|
||||
pm860x_page_reg_write(info->i2c, REG3_ADDR, REG3_DATA);
|
||||
|
||||
ret = pm860x_rtc_read_time(&pdev->dev, &tm);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "Failed to read initial time.\n");
|
||||
goto out_rtc;
|
||||
}
|
||||
if ((tm.tm_year < 70) || (tm.tm_year > 138)) {
|
||||
tm.tm_year = 70;
|
||||
tm.tm_mon = 0;
|
||||
tm.tm_mday = 1;
|
||||
tm.tm_hour = 0;
|
||||
tm.tm_min = 0;
|
||||
tm.tm_sec = 0;
|
||||
ret = pm860x_rtc_set_time(&pdev->dev, &tm);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "Failed to set initial time.\n");
|
||||
goto out_rtc;
|
||||
}
|
||||
}
|
||||
rtc_tm_to_time(&tm, &ticks);
|
||||
if (pdata && pdata->sync) {
|
||||
pdata->sync(ticks);
|
||||
info->sync = pdata->sync;
|
||||
}
|
||||
|
||||
info->rtc_dev = rtc_device_register("88pm860x-rtc", &pdev->dev,
|
||||
&pm860x_rtc_ops, THIS_MODULE);
|
||||
ret = PTR_ERR(info->rtc_dev);
|
||||
if (IS_ERR(info->rtc_dev)) {
|
||||
dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
|
||||
goto out_rtc;
|
||||
}
|
||||
|
||||
/*
|
||||
* enable internal XO instead of internal 3.25MHz clock since it can
|
||||
* free running in PMIC power-down state.
|
||||
*/
|
||||
pm860x_set_bits(info->i2c, PM8607_RTC1, RTC1_USE_XO, RTC1_USE_XO);
|
||||
|
||||
#ifdef VRTC_CALIBRATION
|
||||
/* <00> -- 2.7V, <01> -- 2.9V, <10> -- 3.1V, <11> -- 3.3V */
|
||||
if (pdata && pdata->vrtc)
|
||||
info->vrtc = pdata->vrtc & 0x3;
|
||||
else
|
||||
info->vrtc = 1;
|
||||
pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, MEAS2_VRTC);
|
||||
|
||||
/* calibrate VRTC */
|
||||
INIT_DELAYED_WORK(&info->calib_work, calibrate_vrtc_work);
|
||||
schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
|
||||
#endif /* VRTC_CALIBRATION */
|
||||
return 0;
|
||||
out_rtc:
|
||||
free_irq(info->irq, info);
|
||||
out:
|
||||
kfree(info);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit pm860x_rtc_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct pm860x_rtc_info *info = platform_get_drvdata(pdev);
|
||||
|
||||
#ifdef VRTC_CALIBRATION
|
||||
flush_scheduled_work();
|
||||
/* disable measurement */
|
||||
pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
|
||||
#endif /* VRTC_CALIBRATION */
|
||||
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
rtc_device_unregister(info->rtc_dev);
|
||||
free_irq(info->irq, info);
|
||||
kfree(info);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver pm860x_rtc_driver = {
|
||||
.driver = {
|
||||
.name = "88pm860x-rtc",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = pm860x_rtc_probe,
|
||||
.remove = __devexit_p(pm860x_rtc_remove),
|
||||
};
|
||||
|
||||
static int __init pm860x_rtc_init(void)
|
||||
{
|
||||
return platform_driver_register(&pm860x_rtc_driver);
|
||||
}
|
||||
module_init(pm860x_rtc_init);
|
||||
|
||||
static void __exit pm860x_rtc_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&pm860x_rtc_driver);
|
||||
}
|
||||
module_exit(pm860x_rtc_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Marvell 88PM860x RTC driver");
|
||||
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -330,6 +330,11 @@ struct pm860x_led_pdata {
|
|||
unsigned long flags;
|
||||
};
|
||||
|
||||
struct pm860x_rtc_pdata {
|
||||
int (*sync)(unsigned int ticks);
|
||||
int vrtc;
|
||||
};
|
||||
|
||||
struct pm860x_touch_pdata {
|
||||
int gpadc_prebias;
|
||||
int slot_cycle;
|
||||
|
|
@ -349,6 +354,7 @@ struct pm860x_power_pdata {
|
|||
struct pm860x_platform_data {
|
||||
struct pm860x_backlight_pdata *backlight;
|
||||
struct pm860x_led_pdata *led;
|
||||
struct pm860x_rtc_pdata *rtc;
|
||||
struct pm860x_touch_pdata *touch;
|
||||
struct pm860x_power_pdata *power;
|
||||
struct regulator_init_data *regulator;
|
||||
|
|
|
|||
Loading…
Reference in a new issue