| Message ID | 20200710155057.310168-4-jagan@amarulasolutions.com |
|---|---|
| State | New |
| Headers | show |
| Series |
|
| Related | show |
On Fri, Jul 10, 2020 at 9:21 PM Jagan Teki <jagan@amarulasolutions.com> wrote: > From: Suniel Mahesh <sunil@amarulasolutions.com> > > Rockchip RK808 PMIC provides an integrated RTC module. It is > commonly used with Rockchip SoCs. Add basic support to access > date and time. > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> > Signed-off-by: Suniel Mahesh <sunil@amarulasolutions.com> --- > Change for v4: > - rebase > - style fixes > - warning fixes > > drivers/rtc/Kconfig | 8 ++ > drivers/rtc/Makefile | 1 + > drivers/rtc/rk808-rtc.c | 173 ++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 182 insertions(+) > create mode 100644 drivers/rtc/rk808-rtc.c > > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig > index 59e2fc44ba..a754d1b4f1 100644 > --- a/drivers/rtc/Kconfig > +++ b/drivers/rtc/Kconfig > @@ -75,6 +75,14 @@ config RTC_ISL1208 > This driver supports reading and writing the RTC/calendar and > detects > total power failures. > > +config RTC_RK808 > + bool "Enable Rockchip RK8XX RTC driver" > + depends on DM_RTC && PMIC_RK8XX > + default y > + help > + Basic support for Rockchip RK808 PMIC Real Time Clock devices for > + time and date. > + > config RTC_RV3029 > bool "Enable RV3029 driver" > depends on DM_RTC > diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile > index 12eb449583..63e2c3413d 100644 > --- a/drivers/rtc/Makefile > +++ b/drivers/rtc/Makefile > @@ -44,6 +44,7 @@ obj-$(CONFIG_RTC_PCF8563) += pcf8563.o > obj-$(CONFIG_RTC_PCF2127) += pcf2127.o > obj-$(CONFIG_RTC_PL031) += pl031.o > obj-$(CONFIG_RTC_PT7C4338) += pt7c4338.o > +obj-$(CONFIG_RTC_RK808) += rk808-rtc.o > obj-$(CONFIG_RTC_RS5C372A) += rs5c372.o > obj-$(CONFIG_RTC_RV3029) += rv3029.o > obj-$(CONFIG_RTC_RV8803) += rv8803.o > diff --git a/drivers/rtc/rk808-rtc.c b/drivers/rtc/rk808-rtc.c > new file mode 100644 > index 0000000000..50cca4dd4b > --- /dev/null > +++ b/drivers/rtc/rk808-rtc.c > @@ -0,0 +1,173 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * RTC driver for Rockchip RK808 PMIC. > + * > + * Copyright (C) 2020 Amarula Solutions(India). > + * Suniel Mahesh <sunil@amarulasolutions.com> > + * > + * Based on code from Linux kernel: > + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd > + * Author: Chris Zhong <zyw@rock-chips.com> > + * Author: Zhang Qing <zhangqing@rock-chips.com> > + * > + * Date & Time support (no alarms and interrupts) > + */ > + > +#include <command.h> > +#include <common.h> > +#include <dm.h> > +#include <i2c.h> > +#include <rtc.h> > +#include <power/rk8xx_pmic.h> > +#include <power/pmic.h> > +#include <linux/bitops.h> > +#include <linux/compat.h> > + > +/* RTC_CTRL_REG bitfields */ > +#define BIT_RTC_CTRL_REG_STOP_RTC_M BIT(0) > + > +/* RK808 has a shadowed register for saving a "frozen" RTC time. > + * When user setting "GET_TIME" to 1, the time will save in this shadowed > + * register. If set "READSEL" to 1, user read rtc time register, actually > + * get the time of that moment. If we need the real time, clr this bit. > + */ > + > +#define BIT_RTC_CTRL_REG_RTC_GET_TIME BIT(6) > +#define BIT_RTC_CTRL_REG_RTC_READSEL_M BIT(7) > +#define RTC_STATUS_MASK 0xFE > + > +#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 NUM_TIME_REGS (REG_WEEKS - REG_SECONDS + 1) > + > +static int rk808_rtc_set(struct udevice *dev, const struct rtc_time *tm) > +{ > + u8 rtc_data[NUM_TIME_REGS]; > + > + debug("RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n", > + tm->tm_year, tm->tm_mon, tm->tm_mday, > + tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); > + > + 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); > + rtc_data[5] = bin2bcd(tm->tm_year - 2000); > + rtc_data[6] = bin2bcd(tm->tm_wday); > + > + /* Stop RTC while updating the RTC registers */ > + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, 0, > + BIT_RTC_CTRL_REG_STOP_RTC_M); > + pmic_write(dev->parent, REG_SECONDS, rtc_data, NUM_TIME_REGS); > + > + /* Start RTC again */ > + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, > + BIT_RTC_CTRL_REG_STOP_RTC_M, 0); > + > + return 0; > +} > + > +static int rk808_rtc_get(struct udevice *dev, struct rtc_time *tm) > +{ > + u8 rtc_data[NUM_TIME_REGS]; > + > + /* Force an update of the shadowed registers right now */ > + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, 0, > + BIT_RTC_CTRL_REG_RTC_GET_TIME); > + > + /* > + * After we set the GET_TIME bit, the rtc time can't be read > + * immediately. So we should wait up to 31.25 us, about one cycle > of > + * 32khz. If we clear the GET_TIME bit here, the time of i2c > transfer > + * certainly more than 31.25us: 16 * 2.5us at 400kHz bus frequency. > + */ > + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, > + BIT_RTC_CTRL_REG_RTC_GET_TIME, 0); > + pmic_read(dev->parent, REG_SECONDS, rtc_data, NUM_TIME_REGS); > + > + 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)); > + tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 2000; > + tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK); > + > + /* > + * RK808 PMIC RTC h/w counts/has 31 days in november. This is > corrected > + * when date cmd is invoked on prompt. checks for the current day > and > + * if it is 31 November, then adjusts it to 1 December. > + * > + * h/w also has weeks register which counts from 0 to > 7(0(sun)-6(sat)). > + * 7 is an unknown state, reset it back to 0(sun). > + */ > + if (tm->tm_mon == 11 && tm->tm_mday == 31) { > + debug("correcting Nov 31st to Dec 1st (HW bug)\n"); > + tm->tm_mon += 1; > + tm->tm_mday = 1; > + if (tm->tm_wday == 7) > + tm->tm_wday = 0; > + rk808_rtc_set(dev, tm); > + } > + > + if (tm->tm_wday == 7) { > + tm->tm_wday = 0; > + rk808_rtc_set(dev, tm); > + } > + > + debug("RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n", > + tm->tm_year, tm->tm_mon, tm->tm_mday, > + tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); > + > + return 0; > +} > + > +static int rk808_rtc_reset(struct udevice *dev) > +{ > +/* Not needed */ > + return 0; > +} > + > +static int rk808_rtc_init(struct udevice *dev) > +{ > + struct rtc_time tm; > + > + /* start rtc running by default, and use shadowed timer. */ > + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, 0, > + BIT_RTC_CTRL_REG_RTC_READSEL_M); > + pmic_reg_write(dev->parent, REG_RTC_STATUS, RTC_STATUS_MASK); > + > + /* set init time */ > + rk808_rtc_get(dev, &tm); > + > + return 0; > +} > + > +static int rk808_rtc_probe(struct udevice *dev) > +{ > + rk808_rtc_init(dev); > + > + return 0; > +} > + > +static const struct rtc_ops rk808_rtc_ops = { > + .get = rk808_rtc_get, > + .set = rk808_rtc_set, > + .reset = rk808_rtc_reset, > +}; > + > +U_BOOT_DRIVER(rk808_rtc) = { > + .name = "rk808_rtc", > + .id = UCLASS_RTC, > + .ops = &rk808_rtc_ops, > + .probe = rk808_rtc_probe, > +}; > -- > 2.25.1 > >
Hi Jagan, On 2020/7/10 下午11:50, Jagan Teki wrote: > From: Suniel Mahesh <sunil@amarulasolutions.com> > > Rockchip RK808 PMIC provides an integrated RTC module. It is > commonly used with Rockchip SoCs. Add basic support to access > date and time. > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> > --- > Change for v4: > - rebase > - style fixes > - warning fixes Seems like the change request by Elaine in previous version does not update ? Thanks, - Kever > > drivers/rtc/Kconfig | 8 ++ > drivers/rtc/Makefile | 1 + > drivers/rtc/rk808-rtc.c | 173 ++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 182 insertions(+) > create mode 100644 drivers/rtc/rk808-rtc.c > > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig > index 59e2fc44ba..a754d1b4f1 100644 > --- a/drivers/rtc/Kconfig > +++ b/drivers/rtc/Kconfig > @@ -75,6 +75,14 @@ config RTC_ISL1208 > This driver supports reading and writing the RTC/calendar and detects > total power failures. > > +config RTC_RK808 > + bool "Enable Rockchip RK8XX RTC driver" > + depends on DM_RTC && PMIC_RK8XX > + default y > + help > + Basic support for Rockchip RK808 PMIC Real Time Clock devices for > + time and date. > + > config RTC_RV3029 > bool "Enable RV3029 driver" > depends on DM_RTC > diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile > index 12eb449583..63e2c3413d 100644 > --- a/drivers/rtc/Makefile > +++ b/drivers/rtc/Makefile > @@ -44,6 +44,7 @@ obj-$(CONFIG_RTC_PCF8563) += pcf8563.o > obj-$(CONFIG_RTC_PCF2127) += pcf2127.o > obj-$(CONFIG_RTC_PL031) += pl031.o > obj-$(CONFIG_RTC_PT7C4338) += pt7c4338.o > +obj-$(CONFIG_RTC_RK808) += rk808-rtc.o > obj-$(CONFIG_RTC_RS5C372A) += rs5c372.o > obj-$(CONFIG_RTC_RV3029) += rv3029.o > obj-$(CONFIG_RTC_RV8803) += rv8803.o > diff --git a/drivers/rtc/rk808-rtc.c b/drivers/rtc/rk808-rtc.c > new file mode 100644 > index 0000000000..50cca4dd4b > --- /dev/null > +++ b/drivers/rtc/rk808-rtc.c > @@ -0,0 +1,173 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * RTC driver for Rockchip RK808 PMIC. > + * > + * Copyright (C) 2020 Amarula Solutions(India). > + * Suniel Mahesh <sunil@amarulasolutions.com> > + * > + * Based on code from Linux kernel: > + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd > + * Author: Chris Zhong <zyw@rock-chips.com> > + * Author: Zhang Qing <zhangqing@rock-chips.com> > + * > + * Date & Time support (no alarms and interrupts) > + */ > + > +#include <command.h> > +#include <common.h> > +#include <dm.h> > +#include <i2c.h> > +#include <rtc.h> > +#include <power/rk8xx_pmic.h> > +#include <power/pmic.h> > +#include <linux/bitops.h> > +#include <linux/compat.h> > + > +/* RTC_CTRL_REG bitfields */ > +#define BIT_RTC_CTRL_REG_STOP_RTC_M BIT(0) > + > +/* RK808 has a shadowed register for saving a "frozen" RTC time. > + * When user setting "GET_TIME" to 1, the time will save in this shadowed > + * register. If set "READSEL" to 1, user read rtc time register, actually > + * get the time of that moment. If we need the real time, clr this bit. > + */ > + > +#define BIT_RTC_CTRL_REG_RTC_GET_TIME BIT(6) > +#define BIT_RTC_CTRL_REG_RTC_READSEL_M BIT(7) > +#define RTC_STATUS_MASK 0xFE > + > +#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 NUM_TIME_REGS (REG_WEEKS - REG_SECONDS + 1) > + > +static int rk808_rtc_set(struct udevice *dev, const struct rtc_time *tm) > +{ > + u8 rtc_data[NUM_TIME_REGS]; > + > + debug("RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n", > + tm->tm_year, tm->tm_mon, tm->tm_mday, > + tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); > + > + 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); > + rtc_data[5] = bin2bcd(tm->tm_year - 2000); > + rtc_data[6] = bin2bcd(tm->tm_wday); > + > + /* Stop RTC while updating the RTC registers */ > + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, 0, > + BIT_RTC_CTRL_REG_STOP_RTC_M); > + pmic_write(dev->parent, REG_SECONDS, rtc_data, NUM_TIME_REGS); > + > + /* Start RTC again */ > + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, > + BIT_RTC_CTRL_REG_STOP_RTC_M, 0); > + > + return 0; > +} > + > +static int rk808_rtc_get(struct udevice *dev, struct rtc_time *tm) > +{ > + u8 rtc_data[NUM_TIME_REGS]; > + > + /* Force an update of the shadowed registers right now */ > + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, 0, > + BIT_RTC_CTRL_REG_RTC_GET_TIME); > + > + /* > + * After we set the GET_TIME bit, the rtc time can't be read > + * immediately. So we should wait up to 31.25 us, about one cycle of > + * 32khz. If we clear the GET_TIME bit here, the time of i2c transfer > + * certainly more than 31.25us: 16 * 2.5us at 400kHz bus frequency. > + */ > + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, > + BIT_RTC_CTRL_REG_RTC_GET_TIME, 0); > + pmic_read(dev->parent, REG_SECONDS, rtc_data, NUM_TIME_REGS); > + > + 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)); > + tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 2000; > + tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK); > + > + /* > + * RK808 PMIC RTC h/w counts/has 31 days in november. This is corrected > + * when date cmd is invoked on prompt. checks for the current day and > + * if it is 31 November, then adjusts it to 1 December. > + * > + * h/w also has weeks register which counts from 0 to 7(0(sun)-6(sat)). > + * 7 is an unknown state, reset it back to 0(sun). > + */ > + if (tm->tm_mon == 11 && tm->tm_mday == 31) { > + debug("correcting Nov 31st to Dec 1st (HW bug)\n"); > + tm->tm_mon += 1; > + tm->tm_mday = 1; > + if (tm->tm_wday == 7) > + tm->tm_wday = 0; > + rk808_rtc_set(dev, tm); > + } > + > + if (tm->tm_wday == 7) { > + tm->tm_wday = 0; > + rk808_rtc_set(dev, tm); > + } > + > + debug("RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n", > + tm->tm_year, tm->tm_mon, tm->tm_mday, > + tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); > + > + return 0; > +} > + > +static int rk808_rtc_reset(struct udevice *dev) > +{ > +/* Not needed */ > + return 0; > +} > + > +static int rk808_rtc_init(struct udevice *dev) > +{ > + struct rtc_time tm; > + > + /* start rtc running by default, and use shadowed timer. */ > + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, 0, > + BIT_RTC_CTRL_REG_RTC_READSEL_M); > + pmic_reg_write(dev->parent, REG_RTC_STATUS, RTC_STATUS_MASK); > + > + /* set init time */ > + rk808_rtc_get(dev, &tm); > + > + return 0; > +} > + > +static int rk808_rtc_probe(struct udevice *dev) > +{ > + rk808_rtc_init(dev); > + > + return 0; > +} > + > +static const struct rtc_ops rk808_rtc_ops = { > + .get = rk808_rtc_get, > + .set = rk808_rtc_set, > + .reset = rk808_rtc_reset, > +}; > + > +U_BOOT_DRIVER(rk808_rtc) = { > + .name = "rk808_rtc", > + .id = UCLASS_RTC, > + .ops = &rk808_rtc_ops, > + .probe = rk808_rtc_probe, > +};
Hi Kever, On Sat, Jul 18, 2020 at 5:41 PM Kever Yang <kever.yang@rock-chips.com> wrote: > > Hi Jagan, > > On 2020/7/10 下午11:50, Jagan Teki wrote: > > From: Suniel Mahesh <sunil@amarulasolutions.com> > > > > Rockchip RK808 PMIC provides an integrated RTC module. It is > > commonly used with Rockchip SoCs. Add basic support to access > > date and time. > > > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> > > --- > > Change for v4: > > - rebase > > - style fixes > > - warning fixes > > > Seems like the change request by Elaine in previous version does not > update ? Yes, It requires the additional function to add that feature. We are still working on it in proper shape and thinking this series as initial support. Can you push this so-that we can send that feature before rc2 or rc3? Jagan.
On 2020/7/20 下午6:53, Jagan Teki wrote: > Hi Kever, > > On Sat, Jul 18, 2020 at 5:41 PM Kever Yang <kever.yang@rock-chips.com> wrote: >> Hi Jagan, >> >> On 2020/7/10 下午11:50, Jagan Teki wrote: >>> From: Suniel Mahesh <sunil@amarulasolutions.com> >>> >>> Rockchip RK808 PMIC provides an integrated RTC module. It is >>> commonly used with Rockchip SoCs. Add basic support to access >>> date and time. >>> >>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> >>> --- >>> Change for v4: >>> - rebase >>> - style fixes >>> - warning fixes >> >> Seems like the change request by Elaine in previous version does not >> update ? > Yes, It requires the additional function to add that feature. No only new feature required, but also wrong implementation for function. Again, what do you want the RTC in U-Boot used for? Thanks, - Kever > We are > still working on it in proper shape and thinking this series as > initial support. Can you push this so-that we can send that feature > before rc2 or rc3? > > Jagan. > >
Hi kever, On Tue, Jul 21, 2020 at 8:43 AM Kever Yang <kever.yang@rock-chips.com> wrote: > > On 2020/7/20 下午6:53, Jagan Teki wrote: > > Hi Kever, > > > > On Sat, Jul 18, 2020 at 5:41 PM Kever Yang <kever.yang@rock-chips.com> > wrote: > >> Hi Jagan, > >> > >> On 2020/7/10 下午11:50, Jagan Teki wrote: > >>> From: Suniel Mahesh <sunil@amarulasolutions.com> > >>> > >>> Rockchip RK808 PMIC provides an integrated RTC module. It is > >>> commonly used with Rockchip SoCs. Add basic support to access > >>> date and time. > >>> > >>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> > >>> --- > >>> Change for v4: > >>> - rebase > >>> - style fixes > >>> - warning fixes > >> > >> Seems like the change request by Elaine in previous version does not > >> update ? > > Yes, It requires the additional function to add that feature. > > No only new feature required, but also wrong implementation for function. > Yes the implementation doesn't take into effect the hardware bug (31 days for november month). Elaine also pointed out the same in the past. Again, what do you want the RTC in U-Boot used for? > The intention here is to add hardware driver support for any usage in uboot. Cant this patch be considered as the initial support, we will send the corrections as per Linux ASAP. Regards Suniel > > > Thanks, > > - Kever > > > We are > > still working on it in proper shape and thinking this series as > > initial support. Can you push this so-that we can send that feature > > before rc2 or rc3? > > > > Jagan. > > > > > > >
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 59e2fc44ba..a754d1b4f1 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -75,6 +75,14 @@ config RTC_ISL1208 This driver supports reading and writing the RTC/calendar and detects total power failures. +config RTC_RK808 + bool "Enable Rockchip RK8XX RTC driver" + depends on DM_RTC && PMIC_RK8XX + default y + help + Basic support for Rockchip RK808 PMIC Real Time Clock devices for + time and date. + config RTC_RV3029 bool "Enable RV3029 driver" depends on DM_RTC diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 12eb449583..63e2c3413d 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -44,6 +44,7 @@ obj-$(CONFIG_RTC_PCF8563) += pcf8563.o obj-$(CONFIG_RTC_PCF2127) += pcf2127.o obj-$(CONFIG_RTC_PL031) += pl031.o obj-$(CONFIG_RTC_PT7C4338) += pt7c4338.o +obj-$(CONFIG_RTC_RK808) += rk808-rtc.o obj-$(CONFIG_RTC_RS5C372A) += rs5c372.o obj-$(CONFIG_RTC_RV3029) += rv3029.o obj-$(CONFIG_RTC_RV8803) += rv8803.o diff --git a/drivers/rtc/rk808-rtc.c b/drivers/rtc/rk808-rtc.c new file mode 100644 index 0000000000..50cca4dd4b --- /dev/null +++ b/drivers/rtc/rk808-rtc.c @@ -0,0 +1,173 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * RTC driver for Rockchip RK808 PMIC. + * + * Copyright (C) 2020 Amarula Solutions(India). + * Suniel Mahesh <sunil@amarulasolutions.com> + * + * Based on code from Linux kernel: + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd + * Author: Chris Zhong <zyw@rock-chips.com> + * Author: Zhang Qing <zhangqing@rock-chips.com> + * + * Date & Time support (no alarms and interrupts) + */ + +#include <command.h> +#include <common.h> +#include <dm.h> +#include <i2c.h> +#include <rtc.h> +#include <power/rk8xx_pmic.h> +#include <power/pmic.h> +#include <linux/bitops.h> +#include <linux/compat.h> + +/* RTC_CTRL_REG bitfields */ +#define BIT_RTC_CTRL_REG_STOP_RTC_M BIT(0) + +/* RK808 has a shadowed register for saving a "frozen" RTC time. + * When user setting "GET_TIME" to 1, the time will save in this shadowed + * register. If set "READSEL" to 1, user read rtc time register, actually + * get the time of that moment. If we need the real time, clr this bit. + */ + +#define BIT_RTC_CTRL_REG_RTC_GET_TIME BIT(6) +#define BIT_RTC_CTRL_REG_RTC_READSEL_M BIT(7) +#define RTC_STATUS_MASK 0xFE + +#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 NUM_TIME_REGS (REG_WEEKS - REG_SECONDS + 1) + +static int rk808_rtc_set(struct udevice *dev, const struct rtc_time *tm) +{ + u8 rtc_data[NUM_TIME_REGS]; + + debug("RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n", + tm->tm_year, tm->tm_mon, tm->tm_mday, + tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); + + 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); + rtc_data[5] = bin2bcd(tm->tm_year - 2000); + rtc_data[6] = bin2bcd(tm->tm_wday); + + /* Stop RTC while updating the RTC registers */ + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, 0, + BIT_RTC_CTRL_REG_STOP_RTC_M); + pmic_write(dev->parent, REG_SECONDS, rtc_data, NUM_TIME_REGS); + + /* Start RTC again */ + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, + BIT_RTC_CTRL_REG_STOP_RTC_M, 0); + + return 0; +} + +static int rk808_rtc_get(struct udevice *dev, struct rtc_time *tm) +{ + u8 rtc_data[NUM_TIME_REGS]; + + /* Force an update of the shadowed registers right now */ + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, 0, + BIT_RTC_CTRL_REG_RTC_GET_TIME); + + /* + * After we set the GET_TIME bit, the rtc time can't be read + * immediately. So we should wait up to 31.25 us, about one cycle of + * 32khz. If we clear the GET_TIME bit here, the time of i2c transfer + * certainly more than 31.25us: 16 * 2.5us at 400kHz bus frequency. + */ + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, + BIT_RTC_CTRL_REG_RTC_GET_TIME, 0); + pmic_read(dev->parent, REG_SECONDS, rtc_data, NUM_TIME_REGS); + + 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)); + tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 2000; + tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK); + + /* + * RK808 PMIC RTC h/w counts/has 31 days in november. This is corrected + * when date cmd is invoked on prompt. checks for the current day and + * if it is 31 November, then adjusts it to 1 December. + * + * h/w also has weeks register which counts from 0 to 7(0(sun)-6(sat)). + * 7 is an unknown state, reset it back to 0(sun). + */ + if (tm->tm_mon == 11 && tm->tm_mday == 31) { + debug("correcting Nov 31st to Dec 1st (HW bug)\n"); + tm->tm_mon += 1; + tm->tm_mday = 1; + if (tm->tm_wday == 7) + tm->tm_wday = 0; + rk808_rtc_set(dev, tm); + } + + if (tm->tm_wday == 7) { + tm->tm_wday = 0; + rk808_rtc_set(dev, tm); + } + + debug("RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n", + tm->tm_year, tm->tm_mon, tm->tm_mday, + tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); + + return 0; +} + +static int rk808_rtc_reset(struct udevice *dev) +{ +/* Not needed */ + return 0; +} + +static int rk808_rtc_init(struct udevice *dev) +{ + struct rtc_time tm; + + /* start rtc running by default, and use shadowed timer. */ + pmic_clrsetbits(dev->parent, REG_RTC_CTRL, 0, + BIT_RTC_CTRL_REG_RTC_READSEL_M); + pmic_reg_write(dev->parent, REG_RTC_STATUS, RTC_STATUS_MASK); + + /* set init time */ + rk808_rtc_get(dev, &tm); + + return 0; +} + +static int rk808_rtc_probe(struct udevice *dev) +{ + rk808_rtc_init(dev); + + return 0; +} + +static const struct rtc_ops rk808_rtc_ops = { + .get = rk808_rtc_get, + .set = rk808_rtc_set, + .reset = rk808_rtc_reset, +}; + +U_BOOT_DRIVER(rk808_rtc) = { + .name = "rk808_rtc", + .id = UCLASS_RTC, + .ops = &rk808_rtc_ops, + .probe = rk808_rtc_probe, +};