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author | Simon Glass <sjg@chromium.org> | 2015-04-20 12:37:23 -0600 |
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committer | Simon Glass <sjg@chromium.org> | 2015-05-05 20:58:39 -0600 |
commit | dbeda5b2255089889788e0dd3478680feec86139 (patch) | |
tree | e4640d8cee4a8aaf6c13c23e1bd067a3b981e8fd /drivers | |
parent | 94eefdee2f5db36d52e817a01b07c8255527e193 (diff) | |
download | u-boot-dbeda5b2255089889788e0dd3478680feec86139.tar.gz u-boot-dbeda5b2255089889788e0dd3478680feec86139.tar.xz u-boot-dbeda5b2255089889788e0dd3478680feec86139.zip |
dm: rtc: Add a uclass for real-time clocks
Add a uclass for real-time clocks which support getting the current time,
setting it and resetting the chip to a known-working state. Some RTCs have
additional registers which can be used to store settings, so also provide
an interface to these.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/rtc/Kconfig | 8 | ||||
-rw-r--r-- | drivers/rtc/Makefile | 2 | ||||
-rw-r--r-- | drivers/rtc/rtc-uclass.c | 96 |
3 files changed, 106 insertions, 0 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index e69de29bb2..bd63621e37 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -0,0 +1,8 @@ +config DM_RTC + bool "Enable Driver Model for RTC drivers" + depends on DM + help + Enable drver model for real-time-clock drivers. The RTC uclass + then provides the rtc_get()/rtc_set() interface, delegating to + drivers to perform the actual functions. See rtc.h for a + description of the API. diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index fdcbc00295..61373b6fdb 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -7,6 +7,8 @@ #ccflags-y += -DDEBUG +obj-$(CONFIG_DM_RTC) += rtc-uclass.o + obj-$(CONFIG_RTC_AT91SAM9_RTT) += at91sam9_rtt.o obj-$(CONFIG_RTC_BFIN) += bfin_rtc.o obj-y += date.o diff --git a/drivers/rtc/rtc-uclass.c b/drivers/rtc/rtc-uclass.c new file mode 100644 index 0000000000..fe74c69f97 --- /dev/null +++ b/drivers/rtc/rtc-uclass.c @@ -0,0 +1,96 @@ +/* + * (C) Copyright 2015 Google, Inc + * Written by Simon Glass <sjg@chromium.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <rtc.h> + +int dm_rtc_get(struct udevice *dev, struct rtc_time *time) +{ + struct rtc_ops *ops = rtc_get_ops(dev); + + assert(ops); + if (!ops->get) + return -ENOSYS; + return ops->get(dev, time); +} + +int dm_rtc_set(struct udevice *dev, struct rtc_time *time) +{ + struct rtc_ops *ops = rtc_get_ops(dev); + + assert(ops); + if (!ops->set) + return -ENOSYS; + return ops->set(dev, time); +} + +int dm_rtc_reset(struct udevice *dev) +{ + struct rtc_ops *ops = rtc_get_ops(dev); + + assert(ops); + if (!ops->reset) + return -ENOSYS; + return ops->reset(dev); +} + +int rtc_read8(struct udevice *dev, unsigned int reg) +{ + struct rtc_ops *ops = rtc_get_ops(dev); + + assert(ops); + if (!ops->read8) + return -ENOSYS; + return ops->read8(dev, reg); +} + +int rtc_write8(struct udevice *dev, unsigned int reg, int val) +{ + struct rtc_ops *ops = rtc_get_ops(dev); + + assert(ops); + if (!ops->write8) + return -ENOSYS; + return ops->write8(dev, reg, val); +} + +int rtc_read32(struct udevice *dev, unsigned int reg, u32 *valuep) +{ + u32 value = 0; + int ret; + int i; + + for (i = 0; i < sizeof(value); i++) { + ret = rtc_read8(dev, reg + i); + if (ret) + return ret; + value |= ret << (i << 3); + } + + *valuep = value; + return 0; +} + +int rtc_write32(struct udevice *dev, unsigned int reg, u32 value) +{ + int i, ret; + + for (i = 0; i < sizeof(value); i++) { + ret = rtc_write8(dev, reg + i, (value >> (i << 3)) & 0xff); + if (ret) + return ret; + } + + return 0; +} + +UCLASS_DRIVER(rtc) = { + .name = "rtc", + .id = UCLASS_RTC, +}; |