Adding RTC driver for supporting RTC device present inside RK808 PMIC. Signed-off-by: Chris Zhong <zyw@xxxxxxxxxxxxxx> --- Changes in v5: - fixed a bug about set_time failed Changes in v4: - use &client->dev replace rk808->dev Changes in v3: None Changes in v2: Adviced by javier.martinez - Add a separate clock driver, rather than in RTC driver drivers/rtc/Kconfig | 11 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-rk808.c | 442 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 454 insertions(+) create mode 100644 drivers/rtc/rtc-rk808.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index a168e96..48f61b2 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -288,6 +288,17 @@ config RTC_DRV_MAX77686 This driver can also be built as a module. If so, the module will be called rtc-max77686. +config RTC_DRV_RK808 + tristate "Rockchip RK808 RTC" + depends on MFD_RK808 + help + If you say yes here you will get support for the + RTC of Rk808 PMIC. + + This driver can also be built as a module. If so, the module + will be called rtc-rk808. + + config RTC_DRV_RS5C372 tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A" help diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 56f061c..91fe4647 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -109,6 +109,7 @@ obj-$(CONFIG_RTC_DRV_PUV3) += rtc-puv3.o obj-$(CONFIG_RTC_DRV_PXA) += rtc-pxa.o obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o obj-$(CONFIG_RTC_DRV_RC5T583) += rtc-rc5t583.o +obj-$(CONFIG_RTC_DRV_RK808) += rtc-rk808.o obj-$(CONFIG_RTC_DRV_RP5C01) += rtc-rp5c01.o obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o diff --git a/drivers/rtc/rtc-rk808.c b/drivers/rtc/rtc-rk808.c new file mode 100644 index 0000000..b5f0df5 --- /dev/null +++ b/drivers/rtc/rtc-rk808.c @@ -0,0 +1,442 @@ +/* + * RTC driver for Rockchip RK808 + * + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd + * + * Author: Chris Zhong <zyw@xxxxxxxxxxxxxx> + * Author: Zhang Qing <zhangqing@xxxxxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/rtc.h> +#include <linux/bcd.h> +#include <linux/mfd/rk808.h> +#include <linux/platform_device.h> +#include <linux/i2c.h> + +/* RTC_CTRL_REG bitfields */ +#define BIT_RTC_CTRL_REG_STOP_RTC_M BIT(0) +#define BIT_RTC_CTRL_REG_RTC_V_OPT_M BIT(7) +#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M BIT(3) + +#define SECONDS_REG_MSK 0x7F +#define MINUTES_REG_MAK 0x7F +#define HOURS_REG_MSK 0x3F +#define DAYS_REG_MSK 0x3F +#define MONTHS_REG_MSK 0x1F +#define YEARS_REG_MSK 0xFF +#define WEEKS_REG_MSK 0x7 + +/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */ + +#define ALL_TIME_REGS 7 +#define ALL_ALM_REGS 6 + +struct rk808_rtc { + struct rk808 *rk808; + struct rtc_device *rtc; + unsigned int alarm_enabled:1; +}; + +/* + * Read current time and date in RTC + */ +static int rk808_rtc_readtime(struct device *dev, struct rtc_time *tm) +{ + struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); + struct rk808 *rk808 = rk808_rtc->rk808; + unsigned char rtc_data[ALL_TIME_REGS]; + int ret; + + /* Has the RTC been programmed? */ + ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG, + BIT_RTC_CTRL_REG_RTC_V_OPT_M, 0); + if (ret) { + dev_err(dev, "Failed to update RTC control: %d\n", ret); + return ret; + } + + ret = regmap_bulk_read(rk808->regmap, RK808_SECONDS_REG, + rtc_data, ALL_TIME_REGS); + if (ret) { + dev_err(dev, "Failed to bulk read rtc_data: %d\n", ret); + return ret; + } + + tm->tm_sec = bcd2bin(rtc_data[0]) & SECONDS_REG_MSK; + tm->tm_min = bcd2bin(rtc_data[1]) & MINUTES_REG_MAK; + tm->tm_hour = bcd2bin(rtc_data[2]) & HOURS_REG_MSK; + tm->tm_mday = bcd2bin(rtc_data[3]) & DAYS_REG_MSK; + tm->tm_mon = (bcd2bin(rtc_data[4]) & MONTHS_REG_MSK) - 1; + tm->tm_year = (bcd2bin(rtc_data[5]) & YEARS_REG_MSK) + 100; + tm->tm_wday = bcd2bin(rtc_data[6]) & WEEKS_REG_MSK; + dev_dbg(dev, "RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n", + 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday, + tm->tm_wday, tm->tm_hour , tm->tm_min, tm->tm_sec); + + return 0; +} + +/* + * Set current time and date in RTC + */ +static int rk808_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); + struct rk808 *rk808 = rk808_rtc->rk808; + unsigned char rtc_data[ALL_TIME_REGS + 1]; + int ret; + + rtc_data[0] = bin2bcd(tm->tm_sec); + rtc_data[1] = bin2bcd(tm->tm_min); + rtc_data[2] = bin2bcd(tm->tm_hour); + rtc_data[3] = bin2bcd(tm->tm_mday); + rtc_data[4] = bin2bcd(tm->tm_mon + 1); + rtc_data[5] = bin2bcd(tm->tm_year - 100); + rtc_data[6] = bin2bcd(tm->tm_wday); + dev_dbg(dev, "set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n", + 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday, + tm->tm_wday, tm->tm_hour , tm->tm_min, tm->tm_sec); + + /* Stop RTC while updating the RTC registers */ + ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG, + BIT_RTC_CTRL_REG_STOP_RTC_M, + BIT_RTC_CTRL_REG_STOP_RTC_M); + if (ret) { + dev_err(dev, "Failed to update RTC control: %d\n", ret); + return ret; + } + + ret = regmap_bulk_write(rk808->regmap, RK808_SECONDS_REG, + rtc_data, ALL_TIME_REGS); + if (ret) { + dev_err(dev, "Failed to bull write rtc_data: %d\n", ret); + return ret; + } + /* Start RTC again */ + ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG, + BIT_RTC_CTRL_REG_STOP_RTC_M, 0); + if (ret) { + dev_err(dev, "Failed to update RTC control: %d\n", ret); + return ret; + } + return 0; +} + +/* + * Read alarm time and date in RTC + */ +static int rk808_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); + struct rk808 *rk808 = rk808_rtc->rk808; + unsigned char alrm_data[ALL_ALM_REGS]; + uint32_t int_reg; + int ret; + + ret = regmap_bulk_read(rk808->regmap, RK808_ALARM_SECONDS_REG, + alrm_data, ALL_ALM_REGS); + + /* some of these fields may be wildcard/"match all" */ + alrm->time.tm_sec = bcd2bin(alrm_data[0]) & SECONDS_REG_MSK; + alrm->time.tm_min = bcd2bin(alrm_data[1]) & MINUTES_REG_MAK; + alrm->time.tm_hour = bcd2bin(alrm_data[2]) & HOURS_REG_MSK; + alrm->time.tm_mday = bcd2bin(alrm_data[3]) & DAYS_REG_MSK; + alrm->time.tm_mon = (bcd2bin(alrm_data[4]) & MONTHS_REG_MSK) - 1; + alrm->time.tm_year = (bcd2bin(alrm_data[5]) & YEARS_REG_MSK) + 100; + + ret = regmap_read(rk808->regmap, RK808_RTC_INT_REG, &int_reg); + if (ret) { + dev_err(dev, "Failed to read RTC INT REG: %d\n", ret); + return ret; + } + + dev_dbg(dev, "alrm read RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n", + 1900 + alrm->time.tm_year, alrm->time.tm_mon + 1, + alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour, + alrm->time.tm_min, alrm->time.tm_sec); + + alrm->enabled = (int_reg & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M) ? 1 : 0; + + return 0; +} + +static int rk808_rtc_stop_alarm(struct rk808_rtc *rk808_rtc) +{ + struct rk808 *rk808 = rk808_rtc->rk808; + int ret; + + ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG, + BIT_RTC_INTERRUPTS_REG_IT_ALARM_M, 0); + if (!ret) + rk808_rtc->alarm_enabled = 0; + + return ret; +} + +static int rk808_rtc_start_alarm(struct rk808_rtc *rk808_rtc) +{ + struct rk808 *rk808 = rk808_rtc->rk808; + int ret; + + ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG, + BIT_RTC_INTERRUPTS_REG_IT_ALARM_M, + BIT_RTC_INTERRUPTS_REG_IT_ALARM_M); + if (!ret) + rk808_rtc->alarm_enabled = 1; + + return ret; +} + +static int rk808_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); + struct rk808 *rk808 = rk808_rtc->rk808; + unsigned char alrm_data[ALL_TIME_REGS]; + int ret; + + ret = rk808_rtc_stop_alarm(rk808_rtc); + if (ret) { + dev_err(dev, "Failed to stop alarm: %d\n", ret); + return ret; + } + dev_dbg(dev, "alrm set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n", + 1900 + alrm->time.tm_year, alrm->time.tm_mon + 1, + alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour, + alrm->time.tm_min, alrm->time.tm_sec); + + alrm_data[0] = bin2bcd(alrm->time.tm_sec); + alrm_data[1] = bin2bcd(alrm->time.tm_min); + alrm_data[2] = bin2bcd(alrm->time.tm_hour); + alrm_data[3] = bin2bcd(alrm->time.tm_mday); + alrm_data[4] = bin2bcd(alrm->time.tm_mon + 1); + alrm_data[5] = bin2bcd(alrm->time.tm_year - 100); + + ret = regmap_bulk_write(rk808->regmap, RK808_ALARM_SECONDS_REG, + alrm_data, ALL_ALM_REGS); + if (ret) { + dev_err(dev, "Failed to bulk write: %d\n", ret); + return ret; + } + if (alrm->enabled) { + ret = rk808_rtc_start_alarm(rk808_rtc); + if (ret) { + dev_err(dev, "Failed to start alarm: %d\n", ret); + return ret; + } + } + return 0; +} + +static int rk808_rtc_alarm_irq_enable(struct device *dev, + unsigned int enabled) +{ + struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); + + if (enabled) + return rk808_rtc_start_alarm(rk808_rtc); + + return rk808_rtc_stop_alarm(rk808_rtc); +} + +/* + * We will just handle setting the frequency and make use the framework for + * reading the periodic interupts. + * + * @freq: Current periodic IRQ freq: + * bit 0: every second + * bit 1: every minute + * bit 2: every hour + * bit 3: every day + */ +static irqreturn_t rk808_alm_irq(int irq, void *data) +{ + struct rk808_rtc *rk808_rtc = data; + struct rk808 *rk808 = rk808_rtc->rk808; + struct i2c_client *client = rk808->i2c; + uint32_t rtc_ctl; + int ret; + + ret = regmap_update_bits(rk808->regmap, RK808_RTC_STATUS_REG, + 0, 0); + if (ret) { + dev_err(&client->dev, + "%s:Failed to update RTC status: %d\n", __func__, ret); + return ret; + } + + rtc_update_irq(rk808_rtc->rtc, 1, RTC_IRQF | RTC_AF); + dev_info(&client->dev, + "%s:irq=%d,rtc_ctl=0x%x\n", __func__, irq, rtc_ctl); + return IRQ_HANDLED; +} + +static const struct rtc_class_ops rk808_rtc_ops = { + .read_time = rk808_rtc_readtime, + .set_time = rk808_rtc_set_time, + .read_alarm = rk808_rtc_readalarm, + .set_alarm = rk808_rtc_setalarm, + .alarm_irq_enable = rk808_rtc_alarm_irq_enable, +}; + +#ifdef CONFIG_PM +/* Turn off the alarm if it should not be a wake source. */ +static int rk808_rtc_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev); + int ret; + + if (rk808_rtc->alarm_enabled && device_may_wakeup(&pdev->dev)) + ret = rk808_rtc_start_alarm(rk808_rtc); + else + ret = rk808_rtc_stop_alarm(rk808_rtc); + + if (ret) + dev_err(&pdev->dev, "Failed to update RTC alarm: %d\n", ret); + + return ret; +} + +/* Enable the alarm if it should be enabled (in case it was disabled to + * prevent use as a wake source). + */ +static int rk808_rtc_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev); + int ret; + + if (rk808_rtc->alarm_enabled) { + ret = rk808_rtc_start_alarm(rk808_rtc); + if (ret) + dev_err(&pdev->dev, + "Failed to restart RTC alarm: %d\n", ret); + } + + return ret; +} +#else +#define rk808_rtc_suspend NULL +#define rk808_rtc_resume NULL +#endif + +static const struct dev_pm_ops rk808_rtc_pm_ops = { + .suspend = rk808_rtc_suspend, + .resume = rk808_rtc_resume, + .poweroff = rk808_rtc_suspend, +}; + +/*2012.1.1 12:00:00 Saturday*/ +struct rtc_time tm_def = { + .tm_wday = 6, + .tm_year = 112, + .tm_mon = 0, + .tm_mday = 1, + .tm_hour = 12, + .tm_min = 0, + .tm_sec = 0, +}; + +static int rk808_rtc_probe(struct platform_device *pdev) +{ + struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent); + struct i2c_client *client = rk808->i2c; + struct rk808_rtc *rk808_rtc; + struct rtc_time tm; + int alm_irq; + int ret; + + rk808_rtc = devm_kzalloc(&pdev->dev, sizeof(*rk808_rtc), GFP_KERNEL); + if (rk808_rtc == NULL) + return -ENOMEM; + + platform_set_drvdata(pdev, rk808_rtc); + rk808_rtc->rk808 = rk808; + + /* start rtc default */ + ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG, + BIT_RTC_CTRL_REG_STOP_RTC_M, 0); + if (ret) { + dev_err(&pdev->dev, + "Failed to read RTC control: %d\n", ret); + return ret; + } + + ret = regmap_write(rk808->regmap, RK808_RTC_STATUS_REG, 0xfe); + if (ret) { + dev_err(&pdev->dev, + "Failed to write RTC control: %d\n", ret); + return ret; + } + + /* set init time */ + ret = rk808_rtc_readtime(&pdev->dev, &tm); + if (ret) { + dev_err(&pdev->dev, "Failed to read RTC time\n"); + return ret; + } + ret = rtc_valid_tm(&tm); + if (ret) { + dev_err(&pdev->dev, "invalid date/time and init time\n"); + rk808_rtc_set_time(&pdev->dev, &tm_def); + } + + device_init_wakeup(&pdev->dev, 1); + + rk808_rtc->rtc = devm_rtc_device_register(&pdev->dev, + "rk808", &rk808_rtc_ops, THIS_MODULE); + if (IS_ERR(rk808_rtc->rtc)) { + ret = PTR_ERR(rk808_rtc->rtc); + return ret; + } + + alm_irq = platform_get_irq(pdev, 0); + if (alm_irq <= 0) { + dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n", + alm_irq); + return -ENXIO; + } + + /* request alarm irq of rk808 */ + ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL, + rk808_alm_irq, + IRQF_TRIGGER_LOW | IRQF_EARLY_RESUME, + "RTC alarm", rk808_rtc); + if (ret) { + dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n", + alm_irq, ret); + } + device_set_wakeup_capable(&pdev->dev, 1); + + dev_info(&client->dev, "%s:ok\n", __func__); + + return ret; +} + +static struct platform_driver rk808_rtc_driver = { + .probe = rk808_rtc_probe, + .driver = { + .name = "rk808-rtc", + .pm = &rk808_rtc_pm_ops, + }, +}; + +module_platform_driver(rk808_rtc_driver); + +MODULE_DESCRIPTION("RTC driver for the rk808 series PMICs"); +MODULE_AUTHOR("Chris Zhong <zyw@xxxxxxxxxxxxxx>"); +MODULE_AUTHOR("Zhang Qing <zhanqging@xxxxxxxxxxxxxx>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:rk808-rtc"); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html