diff options
Diffstat (limited to 'drivers/rtc/rtc-s5m.c')
| -rw-r--r-- | drivers/rtc/rtc-s5m.c | 706 |
1 files changed, 706 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-s5m.c b/drivers/rtc/rtc-s5m.c new file mode 100644 index 0000000..22c4ff7 --- /dev/null +++ b/drivers/rtc/rtc-s5m.c @@ -0,0 +1,706 @@ +/* + * rtc-s5m.c + * + * Copyright (c) 2011 Samsung Electronics Co., Ltd + * http://www.samsung.com + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/slab.h> +#include <linux/bcd.h> +#include <linux/rtc.h> +#include <linux/delay.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/mfd/s5m87xx/s5m-core.h> +#include <linux/mfd/s5m87xx/s5m-rtc.h> + +struct s5m_rtc_info { + struct device *dev; + struct s5m87xx_dev *s5m87xx; + struct i2c_client *rtc; + struct rtc_device *rtc_dev; + struct mutex lock; + int irq; + int device_type; + int rtc_24hr_mode; + bool wtsr_smpl; +}; + +static inline int s5m8767_rtc_calculate_wday(u8 shifted) +{ + int counter = -1; + while (shifted) { + shifted >>= 1; + counter++; + } + return counter; +} + +static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm, + int rtc_24hr_mode) +{ + tm->tm_sec = data[RTC_SEC] & 0x7f; + tm->tm_min = data[RTC_MIN] & 0x7f; + if (rtc_24hr_mode) + tm->tm_hour = data[RTC_HOUR] & 0x1f; + else { + tm->tm_hour = data[RTC_HOUR] & 0x0f; + if (data[RTC_HOUR] & HOUR_PM_MASK) + tm->tm_hour += 12; + } + + tm->tm_wday = s5m8767_rtc_calculate_wday(data[RTC_WEEKDAY] & 0x7f); + tm->tm_mday = data[RTC_DATE] & 0x1f; + tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1; + tm->tm_year = (data[RTC_YEAR1] & 0x7f) + (bcd2bin(data[RTC_YEAR2]) * 100); + tm->tm_year -= 1900; + tm->tm_yday = 0; + tm->tm_isdst = 0; +} + +static void s5m8767_tm_to_data(struct rtc_time *tm, u8 *data) +{ + data[RTC_SEC] = tm->tm_sec; + data[RTC_MIN] = tm->tm_min; + + if (tm->tm_hour >= 12) + data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK; + else + data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK; + + data[RTC_WEEKDAY] = 1 << tm->tm_wday; + data[RTC_DATE] = tm->tm_mday; + data[RTC_MONTH] = tm->tm_mon + 1; + data[RTC_YEAR1] = tm->tm_year % 100; + data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100); +} + +static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info) +{ + int ret; + u8 data; + + ret = s5m_reg_read(info->rtc, S5M87XX_RTC_UDR_CON, &data); + if (ret < 0) + return ret; + + data |= RTC_TIME_EN_MASK; + data |= RTC_UDR_MASK; + + ret = s5m_reg_write(info->rtc, S5M87XX_RTC_UDR_CON, data); + if (ret < 0) + dev_err(info->dev, "%s: fail to write update reg(%d)\n", + __func__, ret); + else + msleep(20); + + return ret; +} + +static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info) +{ + int ret; + u8 data; + + ret = s5m_reg_read(info->rtc, S5M87XX_RTC_UDR_CON, &data); + if (ret < 0) + return ret; + + data &= ~RTC_TIME_EN_MASK; + data |= RTC_UDR_MASK; + + ret = s5m_reg_write(info->rtc, S5M87XX_RTC_UDR_CON, data); + if (ret < 0) { + dev_err(info->dev, "%s: fail to write update reg(%d)\n", + __func__, ret); + } else { + msleep(20); + } + + return ret; +} + +static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm) +{ + tm->tm_sec = bcd2bin(data[RTC_SEC]); + tm->tm_min = bcd2bin(data[RTC_MIN]); + + if (data[RTC_HOUR] & HOUR_12) { + tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f); + if (data[RTC_HOUR] & HOUR_PM) + tm->tm_hour += 12; + } else + tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f); + + tm->tm_wday = data[RTC_WEEKDAY] & 0x07; + tm->tm_mday = bcd2bin(data[RTC_DATE]); + tm->tm_mon = bcd2bin(data[RTC_MONTH]); + tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100; + tm->tm_year -= 1900; +} + +static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data) +{ + data[RTC_SEC] = bin2bcd(tm->tm_sec); + data[RTC_MIN] = bin2bcd(tm->tm_min); + data[RTC_HOUR] = bin2bcd(tm->tm_hour); + data[RTC_WEEKDAY] = tm->tm_wday; + data[RTC_DATE] = bin2bcd(tm->tm_mday); + data[RTC_MONTH] = bin2bcd(tm->tm_mon); + data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100); + data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100); +} + +static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct s5m_rtc_info *info = dev_get_drvdata(dev); + u8 data[8]; + int ret; + + mutex_lock(&info->lock); + + ret = s5m_bulk_read(info->rtc, S5M87XX_RTC_SEC, 8, data); + if (ret < 0) + goto out; + + switch (info->device_type) { + case S5M8763X: + s5m8763_data_to_tm(data, tm); + break; + + case S5M8767X: + s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode); + break; + + default: + ret = (-EINVAL); + goto out; + } + + printk(KERN_INFO "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__, + 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday, + tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday); + +out: + mutex_unlock(&info->lock); + if (ret >= 0) + ret = rtc_valid_tm(tm); + return ret; +} + +static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct s5m_rtc_info *info = dev_get_drvdata(dev); + u8 data[8]; + int ret; + + switch (info->device_type) { + case S5M8763X: + s5m8763_tm_to_data(tm, data); + break; + case S5M8767X: + s5m8767_tm_to_data(tm, data); + break; + default: + return -EINVAL; + } + + printk(KERN_INFO "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__, + 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday, + tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday); + + mutex_lock(&info->lock); + + ret = s5m_bulk_write(info->rtc, S5M87XX_RTC_SEC, 8, data); + if (ret < 0) + goto out; + + ret = s5m8767_rtc_set_time_reg(info); + +out: + mutex_unlock(&info->lock); + return ret; +} + +static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct s5m_rtc_info *info = dev_get_drvdata(dev); + u8 data[8]; + u8 val; + int ret, i; + + mutex_lock(&info->lock); + + ret = s5m_bulk_read(info->rtc, S5M87XX_ALARM0_SEC, 8, data); + if (ret < 0) + goto out; + + switch (info->device_type) { + case S5M8763X: + s5m8763_data_to_tm(data, &alrm->time); + ret = s5m_reg_read(info->rtc, S5M87XX_ALARM0_CONF, &val); + if (ret < 0) + goto out; + + alrm->enabled = !!val; + + ret = s5m_reg_read(info->rtc, S5M87XX_RTC_STATUS, &val); + if (ret < 0) + goto out; + + break; + + case S5M8767X: + s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode); + printk(KERN_INFO "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__, + 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon, + alrm->time.tm_mday, alrm->time.tm_hour, + alrm->time.tm_min, alrm->time.tm_sec, + alrm->time.tm_wday); + + alrm->enabled = 0; + for (i = 0; i < 7; i++) { + if (data[i] & ALARM_ENABLE_MASK) { + alrm->enabled = 1; + break; + } + } + + alrm->pending = 0; + ret = s5m_reg_read(info->rtc, S5M87XX_RTC_STATUS, &val); + if (ret < 0) + goto out; + break; + + default: + ret = (-EINVAL); + goto out; + } + + if (val & ALARM0_STATUS) + alrm->pending = 1; + else + alrm->pending = 0; +out: + mutex_unlock(&info->lock); + return ret; +} + +static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info) +{ + u8 data[8]; + int ret, i; + struct rtc_time tm; + + if (!mutex_is_locked(&info->lock)) + dev_warn(info->dev, "%s: should have mutex locked\n", __func__); + + ret = s5m_bulk_read(info->rtc, S5M87XX_ALARM0_SEC, 8, data); + if (ret < 0) + return ret; + + s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode); + printk(KERN_INFO "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__, + 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday); + + switch (info->device_type) { + case S5M8763X: + ret = s5m_reg_write(info->rtc, S5M87XX_ALARM0_CONF, 0); + break; + + case S5M8767X: + for (i = 0; i < 7; i++) + data[i] &= ~ALARM_ENABLE_MASK; + + ret = s5m_bulk_write(info->rtc, S5M87XX_ALARM0_SEC, 8, data); + if (ret <0) + return ret; + + ret = s5m8767_rtc_set_alarm_reg(info); + + break; + + default: + return -EINVAL; + } + + return ret; +} + +static int s5m_rtc_start_alarm(struct s5m_rtc_info *info) +{ + int ret; + u8 data[8]; + u8 alarm0_conf; + struct rtc_time tm; + + if (!mutex_is_locked(&info->lock)) + dev_warn(info->dev, "%s: should have mutex locked\n", __func__); + + ret = s5m_bulk_read(info->rtc, S5M87XX_ALARM0_SEC, 8, data); + if (ret < 0) + return ret; + + s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode); + printk(KERN_INFO "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__, + 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday); + + switch (info->device_type) { + case S5M8763X: + alarm0_conf = 0x77; + ret = s5m_reg_write(info->rtc, S5M87XX_ALARM0_CONF, alarm0_conf); + break; + + case S5M8767X: + data[RTC_SEC] |= ALARM_ENABLE_MASK; + data[RTC_MIN] |= ALARM_ENABLE_MASK; + data[RTC_HOUR] |= ALARM_ENABLE_MASK; + data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK; + if (data[RTC_DATE] & 0x1f) + data[RTC_DATE] |= ALARM_ENABLE_MASK; + if (data[RTC_MONTH] & 0xf) + data[RTC_MONTH] |= ALARM_ENABLE_MASK; + if (data[RTC_YEAR1] & 0x7f) + data[RTC_YEAR1] |= ALARM_ENABLE_MASK; + + ret = s5m_bulk_write(info->rtc, S5M87XX_ALARM0_SEC, 8, data); + if (ret < 0) + return ret; + ret = s5m8767_rtc_set_alarm_reg(info); + + break; + + default: + return -EINVAL; + } + + return ret; +} + +static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct s5m_rtc_info *info = dev_get_drvdata(dev); + u8 data[8]; + int ret; + + switch (info->device_type) { + case S5M8763X: + s5m8763_tm_to_data(&alrm->time, data); + break; + + case S5M8767X: + s5m8767_tm_to_data(&alrm->time, data); + break; + + default: + return -EINVAL; + } + + printk(KERN_INFO "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__, + 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon, + alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min, + alrm->time.tm_sec, alrm->time.tm_wday); + + mutex_lock(&info->lock); + + ret = s5m_rtc_stop_alarm(info); + if (ret < 0) + goto out; + + ret = s5m_bulk_write(info->rtc, S5M87XX_ALARM0_SEC, 8, data); + if (ret < 0) + goto out; + + ret = s5m8767_rtc_set_alarm_reg(info); + if (ret < 0) + goto out; + + if (alrm->enabled) + ret = s5m_rtc_start_alarm(info); +out: + mutex_unlock(&info->lock); + return ret; +} + +static int s5m_rtc_alarm_irq_enable(struct device *dev, + unsigned int enabled) +{ + struct s5m_rtc_info *info = dev_get_drvdata(dev); + int ret; + + mutex_lock(&info->lock); + if (enabled) { + ret = s5m_rtc_start_alarm(info); + } else { + ret = s5m_rtc_stop_alarm(info); + } + mutex_unlock(&info->lock); + + return ret; +} + +static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data) +{ + struct s5m_rtc_info *info = data; + + rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF); + + return IRQ_HANDLED; +} + +static const struct rtc_class_ops s5m_rtc_ops = { + .read_time = s5m_rtc_read_time, + .set_time = s5m_rtc_set_time, + .read_alarm = s5m_rtc_read_alarm, + .set_alarm = s5m_rtc_set_alarm, + .alarm_irq_enable = s5m_rtc_alarm_irq_enable, +}; + +static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable) +{ + int ret; + u8 val, mask; + + if (enable) + val = WTSR_ENABLE_MASK; + else + val = 0; + + mask = WTSR_ENABLE_MASK; + + dev_info(info->dev, "%s: %s WTSR\n", __func__, + enable ? "enable" : "disable"); + + ret = s5m_reg_update(info->rtc, S5M87XX_WTSR_SMPL_CNTL, val, mask); + if (ret < 0) { + dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n", + __func__, ret); + return; + } +} + +static void s5m_rtc_enable_smpl(struct s5m_rtc_info *info, bool enable) +{ + int ret; + u8 val, mask; + + if (enable) + val = SMPL_ENABLE_MASK; + else + val = 0; + + mask = SMPL_ENABLE_MASK; + + dev_info(info->dev, "%s: %s SMPL\n", __func__, + enable ? "enable" : "disable"); + + ret = s5m_reg_update(info->rtc, S5M87XX_WTSR_SMPL_CNTL, val, mask); + if (ret < 0) { + dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n", + __func__, ret); + return; + } + + val = 0; + s5m_reg_read(info->rtc, S5M87XX_WTSR_SMPL_CNTL, &val); + pr_info("%s: WTSR_SMPL(0x%02x)\n", __func__, val); +} + +static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info) +{ + u8 data[2], tp_read; + int ret; + struct rtc_time tm; + + ret = s5m_reg_read(info->rtc, S5M87XX_RTC_UDR_CON, &tp_read); + if (ret < 0) { + dev_err(info->dev, "%s: fail to read control reg(%d)\n", + __func__, ret); + return ret; + } + + /* Set RTC control register : Binary mode, 24hour mdoe */ + data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT); + data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT); + + info->rtc_24hr_mode = 1; + ret = s5m_bulk_write(info->rtc, S5M87XX_ALARM0_CONF, 2, data); + if (ret < 0) { + dev_err(info->dev, "%s: fail to write controlm reg(%d)\n", + __func__, ret); + return ret; + } + + /* In first boot time, Set rtc time to 1/1/2012 00:00:00(SUN) */ + if ((tp_read & RTC_TCON_MASK) == 0) { + dev_info(info->dev, "rtc init\n"); + tm.tm_sec = 0; + tm.tm_min = 0; + tm.tm_hour = 0; + tm.tm_wday = 0; + tm.tm_mday = 1; + tm.tm_mon = 0; + tm.tm_year = 112; + tm.tm_yday = 0; + tm.tm_isdst = 0; + ret = s5m_rtc_set_time(info->dev, &tm); + } + + ret = s5m_reg_update(info->rtc, S5M87XX_RTC_UDR_CON, + tp_read | RTC_TCON_MASK, RTC_TCON_MASK); + if (ret < 0) { + dev_err(info->dev, "%s: fail to update TCON reg(%d)\n", + __func__, ret); + return ret; + } + + return ret; +} + +static int __devinit s5m_rtc_probe(struct platform_device *pdev) +{ + struct s5m87xx_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent); + struct s5m_platform_data *pdata = dev_get_platdata(s5m87xx->dev); + struct s5m_rtc_info *info; + int ret; + + info = kzalloc(sizeof(struct s5m_rtc_info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + mutex_init(&info->lock); + info->dev = &pdev->dev; + info->s5m87xx = s5m87xx; + info->rtc = s5m87xx->rtc; + info->device_type = s5m87xx->device_type; + info->wtsr_smpl = s5m87xx->wtsr_smpl; + + switch (pdata->device_type) { + case S5M8763X: + info->irq = s5m87xx->irq_base + S5M8763_IRQ_ALARM0; + break; + + case S5M8767X: + info->irq = s5m87xx->irq_base + S5M8767_IRQ_RTCA1; + break; + + default: + ret = -EINVAL; + dev_err(&pdev->dev, "Unsupported device type: %d\n", ret); + goto out_rtc; + } + + platform_set_drvdata(pdev, info); + + ret = s5m8767_rtc_init_reg(info); + + if (info->wtsr_smpl) { + s5m_rtc_enable_wtsr(info, true); + s5m_rtc_enable_smpl(info, true); + } + + device_init_wakeup(&pdev->dev, 1); + + info->rtc_dev = rtc_device_register("s5m-rtc", &pdev->dev, + &s5m_rtc_ops, THIS_MODULE); + + if (IS_ERR(info->rtc_dev)) { + ret = PTR_ERR(info->rtc_dev); + dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); + goto out_rtc; + } + + ret = request_threaded_irq(info->irq, NULL, s5m_rtc_alarm_irq, 0, + "rtc-alarm0", info); + + if (ret < 0) + dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", + info->irq, ret); + + dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name); + + return 0; + +out_rtc: + platform_set_drvdata(pdev, NULL); + kfree(info); + return ret; +} + +static int __devexit s5m_rtc_remove(struct platform_device *pdev) +{ + struct s5m_rtc_info *info = platform_get_drvdata(pdev); + + if (info) { + free_irq(info->irq, info); + rtc_device_unregister(info->rtc_dev); + kfree(info); + } + + return 0; +} + +static void s5m_rtc_shutdown(struct platform_device *pdev) +{ + struct s5m_rtc_info *info = platform_get_drvdata(pdev); + int i; + u8 val = 0; + if (info->wtsr_smpl) { + for (i = 0; i < 3; i++) { + s5m_rtc_enable_wtsr(info, false); + s5m_reg_read(info->rtc, S5M87XX_WTSR_SMPL_CNTL, &val); + pr_info("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val); + if (val & WTSR_ENABLE_MASK) + pr_emerg("%s: fail to disable WTSR\n", __func__); + else { + pr_info("%s: success to disable WTSR\n", __func__); + break; + } + } + } + /* Disable SMPL when power off */ + s5m_rtc_enable_smpl(info, false); +} + +static const struct platform_device_id s5m_rtc_id[] = { + { "s5m-rtc", 0 }, +}; + +static struct platform_driver s5m_rtc_driver = { + .driver = { + .name = "s5m-rtc", + .owner = THIS_MODULE, + }, + .probe = s5m_rtc_probe, + .remove = __devexit_p(s5m_rtc_remove), + .shutdown = s5m_rtc_shutdown, + .id_table = s5m_rtc_id, +}; + +static int __init s5m_rtc_init(void) +{ + return platform_driver_register(&s5m_rtc_driver); +} +module_init(s5m_rtc_init); + +static void __exit s5m_rtc_exit(void) +{ + platform_driver_unregister(&s5m_rtc_driver); +} +module_exit(s5m_rtc_exit); + +/* Module information */ +MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>"); +MODULE_DESCRIPTION("Samsung S5M RTC driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:s5m-rtc"); |