Import the Linux v6.10-rc3 state of the RTC/NVMEM driver, so it can be
used to check wall time in barebox.
Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
---
drivers/rtc/Kconfig | 14 ++
drivers/rtc/Makefile | 2 +
drivers/rtc/nvmem.c | 29 +++
drivers/rtc/rtc-pcf85063.c | 473 +++++++++++++++++++++++++++++++++++++
include/linux/rtc.h | 14 ++
5 files changed, 532 insertions(+)
create mode 100644 drivers/rtc/nvmem.c
create mode 100644 drivers/rtc/rtc-pcf85063.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 98e58da89bd8..2aabd167538f 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -18,6 +18,14 @@ menuconfig RTC_CLASS
if RTC_CLASS
+config RTC_NVMEM
+ bool "RTC non volatile storage support" if COMPILE_TEST
+ depends on NVMEM
+ default y
+ help
+ Say yes here to add support for the non volatile (often battery
+ backed) storage present on RTCs.
+
comment "I2C RTC drivers"
depends on I2C
@@ -37,6 +45,12 @@ config RTC_DRV_DS1307
config RTC_DRV_ABRACON
tristate "Abracon RTCs"
+config RTC_DRV_PCF85063
+ tristate "NXP PCF85063"
+ select REGMAP_I2C
+ help
+ If you say yes here you get support for the PCF85063 RTC chip
+
config RTC_DRV_PCF85363
tristate "NXP PCF85363"
depends on I2C
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index ec9775b691b3..dff0cfe5bbde 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -5,6 +5,7 @@
obj-$(CONFIG_RTC_LIB) += rtc-lib.o
obj-$(CONFIG_RTC_CLASS) += class.o
+obj-$(CONFIG_RTC_NVMEM) += nvmem.o
# Keep the list ordered.
@@ -12,4 +13,5 @@ obj-$(CONFIG_RTC_DRV_ABRACON) += rtc-abracon.o
obj-$(CONFIG_RTC_DRV_DS1307) += rtc-ds1307.o
obj-$(CONFIG_RTC_DRV_IMXDI) += rtc-imxdi.o
obj-$(CONFIG_RTC_DRV_JZ4740) += rtc-jz4740.o
+obj-$(CONFIG_RTC_DRV_PCF85063) += rtc-pcf85063.o
obj-$(CONFIG_RTC_DRV_PCF85363) += rtc-pcf85363.o
diff --git a/drivers/rtc/nvmem.c b/drivers/rtc/nvmem.c
new file mode 100644
index 000000000000..d5fce5a2236e
--- /dev/null
+++ b/drivers/rtc/nvmem.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RTC subsystem, nvmem interface
+ *
+ * Copyright (C) 2017 Alexandre Belloni
+ */
+
+#include <linux/err.h>
+#include <linux/types.h>
+#include <linux/nvmem-provider.h>
+#include <linux/rtc.h>
+
+int rtc_nvmem_register(struct rtc_device *rtc,
+ struct nvmem_config *nvmem_config)
+{
+ struct device *dev = rtc->dev;
+ struct nvmem_device *nvmem;
+
+ if (!nvmem_config)
+ return -ENODEV;
+
+ nvmem_config->dev = dev;
+ nvmem = nvmem_register(nvmem_config);
+ if (IS_ERR(nvmem))
+ dev_err(dev, "failed to register nvmem device for RTC\n");
+
+ return PTR_ERR_OR_ZERO(nvmem);
+}
+EXPORT_SYMBOL_GPL(rtc_nvmem_register);
diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c
new file mode 100644
index 000000000000..82d8d22029f0
--- /dev/null
+++ b/drivers/rtc/rtc-pcf85063.c
@@ -0,0 +1,473 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * An I2C driver for the PCF85063 RTC
+ * Copyright 2014 Rose Technology
+ *
+ * Author: Søren Andersen <s...@rosetechnology.dk>
+ * Maintainers: http://www.nslu2-linux.org/
+ *
+ * Copyright (C) 2019 Micro Crystal AG
+ * Author: Alexandre Belloni <alexandre.bell...@bootlin.com>
+ */
+#include <linux/clk-provider.h>
+#include <i2c/i2c.h>
+#include <linux/bcd.h>
+#include <linux/device.h>
+#include <linux/rtc.h>
+#include <of.h>
+#include <linux/regmap.h>
+
+/*
+ * Information for this driver was pulled from the following datasheets.
+ *
+ * https://www.nxp.com/docs/en/data-sheet/PCF85063A.pdf
+ * https://www.nxp.com/docs/en/data-sheet/PCF85063TP.pdf
+ *
+ * PCF85063A -- Rev. 7 — 30 March 2018
+ * PCF85063TP -- Rev. 4 — 6 May 2015
+ *
+ *
https://www.microcrystal.com/fileadmin/Media/Products/RTC/App.Manual/RV-8263-C7_App-Manual.pdf
+ * RV8263 -- Rev. 1.0 — January 2019
+ */
+
+#define PCF85063_REG_CTRL1 0x00 /* status */
+#define PCF85063_REG_CTRL1_CAP_SEL BIT(0)
+#define PCF85063_REG_CTRL1_STOP BIT(5)
+#define PCF85063_REG_CTRL1_EXT_TEST BIT(7)
+
+#define PCF85063_REG_CTRL2 0x01
+#define PCF85063_CTRL2_AF BIT(6)
+#define PCF85063_CTRL2_AIE BIT(7)
+
+#define PCF85063_REG_OFFSET 0x02
+#define PCF85063_OFFSET_SIGN_BIT 6 /* 2's complement sign bit */
+#define PCF85063_OFFSET_MODE BIT(7)
+#define PCF85063_OFFSET_STEP0 4340
+#define PCF85063_OFFSET_STEP1 4069
+
+#define PCF85063_REG_CLKO_F_MASK 0x07 /* frequency mask */
+#define PCF85063_REG_CLKO_F_32768HZ 0x00
+#define PCF85063_REG_CLKO_F_OFF 0x07
+
+#define PCF85063_REG_RAM 0x03
+
+#define PCF85063_REG_SC 0x04 /* datetime */
+#define PCF85063_REG_SC_OS 0x80
+
+#define PCF85063_REG_ALM_S 0x0b
+#define PCF85063_AEN BIT(7)
+
+struct pcf85063_config {
+ struct regmap_config regmap;
+ unsigned force_cap_7000:1;
+};
+
+struct pcf85063 {
+ struct rtc_device rtc;
+ struct regmap *regmap;
+#ifdef CONFIG_COMMON_CLK
+ struct clk_hw clkout_hw;
+#endif
+};
+
+static inline struct pcf85063 *to_pcf85063_priv(struct rtc_device *rtcdev)
+{
+ return container_of(rtcdev, struct pcf85063, rtc);
+}
+
+static int pcf85063_rtc_read_time(struct rtc_device *rtcdev, struct rtc_time
*tm)
+{
+ struct pcf85063 *pcf85063 = to_pcf85063_priv(rtcdev);
+ int rc;
+ u8 regs[7];
+
+ /*
+ * while reading, the time/date registers are blocked and not updated
+ * anymore until the access is finished. To not lose a second
+ * event, the access must be finished within one second. So, read all
+ * time/date registers in one turn.
+ */
+ rc = regmap_bulk_read(pcf85063->regmap, PCF85063_REG_SC, regs,
+ sizeof(regs));
+ if (rc)
+ return rc;
+
+ /* if the clock has lost its power it makes no sense to use its time */
+ if (regs[0] & PCF85063_REG_SC_OS) {
+ dev_warn(pcf85063->rtc.dev, "Power loss detected, invalid
time\n");
+ return -EINVAL;
+ }
+
+ tm->tm_sec = bcd2bin(regs[0] & 0x7F);
+ tm->tm_min = bcd2bin(regs[1] & 0x7F);
+ tm->tm_hour = bcd2bin(regs[2] & 0x3F); /* rtc hr 0-23 */
+ tm->tm_mday = bcd2bin(regs[3] & 0x3F);
+ tm->tm_wday = regs[4] & 0x07;
+ tm->tm_mon = bcd2bin(regs[5] & 0x1F) - 1; /* rtc mn 1-12 */
+ tm->tm_year = bcd2bin(regs[6]);
+ tm->tm_year += 100;
+
+ return 0;
+}
+
+static int pcf85063_rtc_set_time(struct rtc_device *rtcdev, struct rtc_time
*tm)
+{
+ struct pcf85063 *pcf85063 = to_pcf85063_priv(rtcdev);
+ int rc;
+ u8 regs[7];
+
+ /*
+ * to accurately set the time, reset the divider chain and keep it in
+ * reset state until all time/date registers are written
+ */
+ rc = regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL1,
+ PCF85063_REG_CTRL1_EXT_TEST |
+ PCF85063_REG_CTRL1_STOP,
+ PCF85063_REG_CTRL1_STOP);
+ if (rc)
+ return rc;
+
+ /* hours, minutes and seconds */
+ regs[0] = bin2bcd(tm->tm_sec) & 0x7F; /* clear OS flag */
+
+ regs[1] = bin2bcd(tm->tm_min);
+ regs[2] = bin2bcd(tm->tm_hour);
+
+ /* Day of month, 1 - 31 */
+ regs[3] = bin2bcd(tm->tm_mday);
+
+ /* Day, 0 - 6 */
+ regs[4] = tm->tm_wday & 0x07;
+
+ /* month, 1 - 12 */
+ regs[5] = bin2bcd(tm->tm_mon + 1);
+
+ /* year and century */
+ regs[6] = bin2bcd(tm->tm_year - 100);
+
+ /* write all registers at once */
+ rc = regmap_bulk_write(pcf85063->regmap, PCF85063_REG_SC,
+ regs, sizeof(regs));
+ if (rc)
+ return rc;
+
+ /*
+ * Write the control register as a separate action since the size of
+ * the register space is different between the PCF85063TP and
+ * PCF85063A devices. The rollover point can not be used.
+ */
+ return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL1,
+ PCF85063_REG_CTRL1_STOP, 0);
+}
+
+static const struct rtc_class_ops pcf85063_rtc_ops = {
+ .read_time = pcf85063_rtc_read_time,
+ .set_time = pcf85063_rtc_set_time,
+};
+
+static int pcf85063_nvmem_read(void *priv, unsigned int offset,
+ void *val, size_t bytes)
+{
+ return regmap_read(priv, PCF85063_REG_RAM, val);
+}
+
+static int pcf85063_nvmem_write(void *priv, unsigned int offset,
+ const void *val, size_t bytes)
+{
+ return regmap_write(priv, PCF85063_REG_RAM, *(u8 *)val);
+}
+
+static int pcf85063_load_capacitance(struct pcf85063 *pcf85063,
+ const struct device_node *np,
+ unsigned int force_cap)
+{
+ u32 load = 7000;
+ u8 reg = 0;
+
+ if (force_cap)
+ load = force_cap;
+ else
+ of_property_read_u32(np, "quartz-load-femtofarads", &load);
+
+ switch (load) {
+ default:
+ dev_warn(pcf85063->rtc.dev, "Unknown quartz-load-femtofarads
value: %d. Assuming 7000",
+ load);
+ fallthrough;
+ case 7000:
+ break;
+ case 12500:
+ reg = PCF85063_REG_CTRL1_CAP_SEL;
+ break;
+ }
+
+ return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL1,
+ PCF85063_REG_CTRL1_CAP_SEL, reg);
+}
+
+#ifdef CONFIG_COMMON_CLK
+/*
+ * Handling of the clkout
+ */
+
+#define clkout_hw_to_pcf85063(_hw) container_of(_hw, struct pcf85063,
clkout_hw)
+
+static int clkout_rates[] = {
+ 32768,
+ 16384,
+ 8192,
+ 4096,
+ 2048,
+ 1024,
+ 1,
+ 0
+};
+
+static unsigned long pcf85063_clkout_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
+ unsigned int buf;
+ int ret = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &buf);
+
+ if (ret < 0)
+ return 0;
+
+ buf &= PCF85063_REG_CLKO_F_MASK;
+ return clkout_rates[buf];
+}
+
+static long pcf85063_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
+ if (clkout_rates[i] <= rate)
+ return clkout_rates[i];
+
+ return 0;
+}
+
+static int pcf85063_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
+ if (clkout_rates[i] == rate)
+ return regmap_update_bits(pcf85063->regmap,
+ PCF85063_REG_CTRL2,
+ PCF85063_REG_CLKO_F_MASK, i);
+
+ return -EINVAL;
+}
+
+static int pcf85063_clkout_control(struct clk_hw *hw, bool enable)
+{
+ struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
+ unsigned int buf;
+ int ret;
+
+ ret = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &buf);
+ if (ret < 0)
+ return ret;
+ buf &= PCF85063_REG_CLKO_F_MASK;
+
+ if (enable) {
+ if (buf == PCF85063_REG_CLKO_F_OFF)
+ buf = PCF85063_REG_CLKO_F_32768HZ;
+ else
+ return 0;
+ } else {
+ if (buf != PCF85063_REG_CLKO_F_OFF)
+ buf = PCF85063_REG_CLKO_F_OFF;
+ else
+ return 0;
+ }
+
+ return regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL2,
+ PCF85063_REG_CLKO_F_MASK, buf);
+}
+
+static int pcf85063_clkout_prepare(struct clk_hw *hw)
+{
+ return pcf85063_clkout_control(hw, 1);
+}
+
+static void pcf85063_clkout_unprepare(struct clk_hw *hw)
+{
+ pcf85063_clkout_control(hw, 0);
+}
+
+static int pcf85063_clkout_is_prepared(struct clk_hw *hw)
+{
+ struct pcf85063 *pcf85063 = clkout_hw_to_pcf85063(hw);
+ unsigned int buf;
+ int ret = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL2, &buf);
+
+ if (ret < 0)
+ return 0;
+
+ return (buf & PCF85063_REG_CLKO_F_MASK) != PCF85063_REG_CLKO_F_OFF;
+}
+
+static const struct clk_ops pcf85063_clkout_ops = {
+ .enable = pcf85063_clkout_prepare,
+ .disable = pcf85063_clkout_unprepare,
+ .is_enabled = pcf85063_clkout_is_prepared,
+ .recalc_rate = pcf85063_clkout_recalc_rate,
+ .round_rate = pcf85063_clkout_round_rate,
+ .set_rate = pcf85063_clkout_set_rate,
+};
+
+static struct clk *pcf85063_clkout_register_clk(struct pcf85063 *pcf85063)
+{
+ struct clk *clk;
+ struct clk_init_data init;
+ struct device_node *node = dev_of_node(pcf85063->rtc.dev);
+ struct device_node *fixed_clock;
+
+ fixed_clock = of_get_child_by_name(node, "clock");
+ if (fixed_clock) {
+ /*
+ * skip registering square wave clock when a fixed
+ * clock has been registered. The fixed clock is
+ * registered automatically when being referenced.
+ */
+ of_node_put(fixed_clock);
+ return NULL;
+ }
+
+ init.name = "pcf85063-clkout";
+ init.ops = &pcf85063_clkout_ops;
+ init.flags = 0;
+ init.parent_names = NULL;
+ init.num_parents = 0;
+ pcf85063->clkout_hw.init = &init;
+
+ /* optional override of the clockname */
+ of_property_read_string(node, "clock-output-names", &init.name);
+
+ /* register the clock */
+ clk = clk_register(pcf85063->rtc.dev, &pcf85063->clkout_hw);
+
+ if (!IS_ERR(clk))
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+
+ return clk;
+}
+#endif
+
+static const struct pcf85063_config config_pcf85063 = {
+ .regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x0a,
+ },
+};
+
+static const struct pcf85063_config config_pcf85063tp = {
+ .regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x0a,
+ },
+};
+
+static const struct pcf85063_config config_pcf85063a = {
+ .regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x11,
+ },
+};
+
+static const struct pcf85063_config config_rv8263 = {
+ .regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x11,
+ },
+ .force_cap_7000 = 1,
+};
+
+static int pcf85063_probe(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct pcf85063 *pcf85063;
+ unsigned int tmp;
+ int err;
+ const struct pcf85063_config *config;
+ struct nvmem_config nvmem_cfg = {
+ .name = "pcf85063_nvram",
+ .reg_read = pcf85063_nvmem_read,
+ .reg_write = pcf85063_nvmem_write,
+ .size = 1,
+ };
+
+ dev_dbg(&client->dev, "%s\n", __func__);
+
+ pcf85063 = devm_kzalloc(&client->dev, sizeof(struct pcf85063),
+ GFP_KERNEL);
+ if (!pcf85063)
+ return -ENOMEM;
+
+ config = device_get_match_data(dev);
+ if (!config)
+ return -ENODEV;
+
+ pcf85063->regmap = regmap_init_i2c(client, &config->regmap);
+ if (IS_ERR(pcf85063->regmap))
+ return PTR_ERR(pcf85063->regmap);
+
+ i2c_set_clientdata(client, pcf85063);
+
+ err = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL1, &tmp);
+ if (err) {
+ dev_err(&client->dev, "RTC chip is not present\n");
+ return err;
+ }
+
+ pcf85063->rtc.ops = &pcf85063_rtc_ops;
+ pcf85063->rtc.dev = dev;
+
+ err = pcf85063_load_capacitance(pcf85063, client->dev.of_node,
+ config->force_cap_7000 ? 7000 : 0);
+ if (err < 0)
+ dev_warn(&client->dev, "failed to set xtal load capacitance:
%d",
+ err);
+
+
+ nvmem_cfg.priv = pcf85063->regmap;
+ rtc_nvmem_register(&pcf85063->rtc, &nvmem_cfg);
+
+#ifdef CONFIG_COMMON_CLK
+ /* register clk in common clk framework */
+ pcf85063_clkout_register_clk(pcf85063);
+#endif
+
+ return rtc_register(&pcf85063->rtc);
+}
+
+static const struct of_device_id pcf85063_of_match[] = {
+ { .compatible = "nxp,pca85073a", .data = &config_pcf85063a },
+ { .compatible = "nxp,pcf85063", .data = &config_pcf85063 },
+ { .compatible = "nxp,pcf85063tp", .data = &config_pcf85063tp },
+ { .compatible = "nxp,pcf85063a", .data = &config_pcf85063a },
+ { .compatible = "microcrystal,rv8263", .data = &config_rv8263 },
+ {}
+};
+MODULE_DEVICE_TABLE(of, pcf85063_of_match);
+
+static struct driver pcf85063_driver = {
+ .name = "rtc-pcf85063",
+ .of_match_table = pcf85063_of_match,
+ .probe = pcf85063_probe,
+};
+device_i2c_driver(pcf85063_driver);
+
+MODULE_AUTHOR("Søren Andersen <s...@rosetechnology.dk>");
+MODULE_DESCRIPTION("PCF85063 RTC driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index def07548c554..73dc6dae3a36 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -15,6 +15,9 @@
#include <common.h>
#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/nvmem-provider.h>
+#include <rtc.h>
extern int rtc_month_days(unsigned int month, unsigned int year);
extern int rtc_valid_tm(struct rtc_time *tm);
@@ -46,4 +49,15 @@ static inline bool is_leap_year(unsigned int year)
return (!(year % 4) && (year % 100)) || !(year % 400);
}
+#ifdef CONFIG_NVMEM
+int rtc_nvmem_register(struct rtc_device *rtc,
+ struct nvmem_config *nvmem_config);
+#else
+static inline int rtc_nvmem_register(struct rtc_device *rtc,
+ struct nvmem_config *nvmem_config)
+{
+ return -ENOSYS;
+}
+#endif
+
#endif /* _LINUX_RTC_H_ */
--
2.39.2
