diff options
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/rtc/i2c_rtc_emul.c | 236 |
2 files changed, 237 insertions, 0 deletions
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 61373b6fdb..aeb705ae96 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_RTC_DS164x) += ds164x.o obj-$(CONFIG_RTC_DS174x) += ds174x.o obj-$(CONFIG_RTC_DS3231) += ds3231.o obj-$(CONFIG_RTC_FTRTC010) += ftrtc010.o +obj-$(CONFIG_SANDBOX) += i2c_rtc_emul.o obj-$(CONFIG_RTC_IMXDI) += imxdi.o obj-$(CONFIG_RTC_ISL1208) += isl1208.o obj-$(CONFIG_RTC_M41T11) += m41t11.o diff --git a/drivers/rtc/i2c_rtc_emul.c b/drivers/rtc/i2c_rtc_emul.c new file mode 100644 index 0000000000..20827fdff1 --- /dev/null +++ b/drivers/rtc/i2c_rtc_emul.c @@ -0,0 +1,236 @@ +/* + * Simulate an I2C real time clock + * + * Copyright (c) 2015 Google, Inc + * Written by Simon Glass <sjg@chromium.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +/* + * This is a test driver. It starts off with the current time of the machine, + * but also supports setting the time, using an offset from the current + * clock. This driver is only intended for testing, not accurate + * time-keeping. It does not change the system time. + */ + +#include <common.h> +#include <dm.h> +#include <fdtdec.h> +#include <i2c.h> +#include <os.h> +#include <rtc.h> +#include <asm/rtc.h> +#include <asm/test.h> + +#ifdef DEBUG +#define debug_buffer print_buffer +#else +#define debug_buffer(x, ...) +#endif + +DECLARE_GLOBAL_DATA_PTR; + +/** + * struct sandbox_i2c_rtc_plat_data - platform data for the RTC + * + * @base_time: Base system time when RTC device was bound + * @offset: RTC offset from current system time + * @use_system_time: true to use system time, false to use @base_time + * @reg: Register values + */ +struct sandbox_i2c_rtc_plat_data { + long base_time; + long offset; + bool use_system_time; + u8 reg[REG_COUNT]; +}; + +struct sandbox_i2c_rtc { + unsigned int offset_secs; +}; + +long sandbox_i2c_rtc_set_offset(struct udevice *dev, bool use_system_time, + int offset) +{ + struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev); + long old_offset; + + old_offset = plat->offset; + plat->use_system_time = use_system_time; + if (offset != -1) + plat->offset = offset; + + return old_offset; +} + +long sandbox_i2c_rtc_get_set_base_time(struct udevice *dev, long base_time) +{ + struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev); + long old_base_time; + + old_base_time = plat->base_time; + if (base_time != -1) + plat->base_time = base_time; + + return old_base_time; +} + +static void reset_time(struct udevice *dev) +{ + struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev); + struct rtc_time now; + + os_localtime(&now); + plat->base_time = rtc_mktime(&now); + plat->offset = 0; + plat->use_system_time = true; +} + +static int sandbox_i2c_rtc_get(struct udevice *dev, struct rtc_time *time) +{ + struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev); + struct rtc_time tm_now; + long now; + + if (plat->use_system_time) { + os_localtime(&tm_now); + now = rtc_mktime(&tm_now); + } else { + now = plat->base_time; + } + + return rtc_to_tm(now + plat->offset, time); +} + +static int sandbox_i2c_rtc_set(struct udevice *dev, const struct rtc_time *time) +{ + struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev); + struct rtc_time tm_now; + long now; + + if (plat->use_system_time) { + os_localtime(&tm_now); + now = rtc_mktime(&tm_now); + } else { + now = plat->base_time; + } + plat->offset = rtc_mktime(time) - now; + + return 0; +} + +/* Update the current time in the registers */ +static int sandbox_i2c_rtc_prepare_read(struct udevice *emul) +{ + struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul); + struct rtc_time time; + int ret; + + ret = sandbox_i2c_rtc_get(emul, &time); + if (ret) + return ret; + + plat->reg[REG_SEC] = time.tm_sec; + plat->reg[REG_MIN] = time.tm_min; + plat->reg[REG_HOUR] = time.tm_hour; + plat->reg[REG_MDAY] = time.tm_mday; + plat->reg[REG_MON] = time.tm_mon; + plat->reg[REG_YEAR] = time.tm_year - 1900; + plat->reg[REG_WDAY] = time.tm_wday; + + return 0; +} + +static int sandbox_i2c_rtc_complete_write(struct udevice *emul) +{ + struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul); + struct rtc_time time; + int ret; + + time.tm_sec = plat->reg[REG_SEC]; + time.tm_min = plat->reg[REG_MIN]; + time.tm_hour = plat->reg[REG_HOUR]; + time.tm_mday = plat->reg[REG_MDAY]; + time.tm_mon = plat->reg[REG_MON]; + time.tm_year = plat->reg[REG_YEAR] + 1900; + time.tm_wday = plat->reg[REG_WDAY]; + + ret = sandbox_i2c_rtc_set(emul, &time); + if (ret) + return ret; + + return 0; +} + +static int sandbox_i2c_rtc_xfer(struct udevice *emul, struct i2c_msg *msg, + int nmsgs) +{ + struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul); + uint offset = 0; + int ret; + + debug("\n%s\n", __func__); + ret = sandbox_i2c_rtc_prepare_read(emul); + if (ret) + return ret; + for (; nmsgs > 0; nmsgs--, msg++) { + int len; + u8 *ptr; + + len = msg->len; + debug(" %s: msg->len=%d", + msg->flags & I2C_M_RD ? "read" : "write", + msg->len); + if (msg->flags & I2C_M_RD) { + debug(", offset %x, len %x: ", offset, len); + + /* Read the register */ + memcpy(msg->buf, plat->reg + offset, len); + memset(msg->buf + len, '\xff', msg->len - len); + debug_buffer(0, msg->buf, 1, msg->len, 0); + } else if (len >= 1) { + ptr = msg->buf; + offset = *ptr++ & (REG_COUNT - 1); + len--; + debug(", set offset %x: ", offset); + debug_buffer(0, msg->buf, 1, msg->len, 0); + + /* Write the register */ + memcpy(plat->reg + offset, ptr, len); + if (offset == REG_RESET) + reset_time(emul); + } + } + ret = sandbox_i2c_rtc_complete_write(emul); + if (ret) + return ret; + + return 0; +} + +struct dm_i2c_ops sandbox_i2c_rtc_emul_ops = { + .xfer = sandbox_i2c_rtc_xfer, +}; + +static int sandbox_i2c_rtc_bind(struct udevice *dev) +{ + reset_time(dev); + + return 0; +} + +static const struct udevice_id sandbox_i2c_rtc_ids[] = { + { .compatible = "sandbox,i2c-rtc" }, + { } +}; + +U_BOOT_DRIVER(sandbox_i2c_rtc_emul) = { + .name = "sandbox_i2c_rtc_emul", + .id = UCLASS_I2C_EMUL, + .of_match = sandbox_i2c_rtc_ids, + .bind = sandbox_i2c_rtc_bind, + .priv_auto_alloc_size = sizeof(struct sandbox_i2c_rtc), + .platdata_auto_alloc_size = sizeof(struct sandbox_i2c_rtc_plat_data), + .ops = &sandbox_i2c_rtc_emul_ops, +}; |