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Message-ID: <15a4d019ede6ad8be56832a3b215dfc6ce029bc2.camel@gmail.com>
Date: Wed, 12 Feb 2025 00:47:05 +0100
From: Alexander Sverdlin <alexander.sverdlin@...il.com>
To: Jingbao Qiu <qiujingbao.dlmu@...il.com>, alexandre.belloni@...tlin.com,
robh@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
unicorn_wang@...look.com, inochiama@...look.com, paul.walmsley@...ive.com,
palmer@...belt.com, aou@...s.berkeley.edu
Cc: dlan@...too.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
linux-rtc@...r.kernel.org
Subject: Re: [PATCH v9 2/2] rtc: sophgo: add rtc support for Sophgo CV1800
SoC
Thanks for you patch Jingbao!
On Sun, 2024-04-28 at 14:08 +0800, Jingbao Qiu wrote:
> Implement the RTC driver for CV1800, which able to provide time alarm.
>
> Signed-off-by: Jingbao Qiu <qiujingbao.dlmu@...il.com>
I've tried time read/set on SG2000 SoC (Milk-V Duo Module 01 EVB), however
the time set remains unchanged. Milk-V Duo Module 01 schematics shows
32768Hz oscillator present.
What HW have you tested the driver on? Do you have an idea what could be
the problem on SG2000?
> ---
> drivers/rtc/Kconfig | 10 ++
> drivers/rtc/Makefile | 1 +
> drivers/rtc/rtc-cv1800.c | 240 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 251 insertions(+)
> create mode 100644 drivers/rtc/rtc-cv1800.c
>
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index 2a95b05982ad..b7746ca22b94 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -1138,6 +1138,16 @@ config RTC_DRV_DS2404
> This driver can also be built as a module. If so, the module
> will be called rtc-ds2404.
>
> +config RTC_DRV_CV1800
> + tristate "Sophgo CV1800 RTC"
> + depends on ARCH_SOPHGO || COMPILE_TEST
> + help
> + If you say yes here you get support the RTC driver
> + for Sophgo CV1800 chip.
> +
> + This driver can also be built as a module.If so, the
> + module will be called rtc-cv1800.
> +
> config RTC_DRV_DA9052
> tristate "Dialog DA9052/DA9053 RTC"
> depends on PMIC_DA9052
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index 3004e372f25f..a0861c0f3c89 100644
> --- a/drivers/rtc/Makefile
> +++ b/drivers/rtc/Makefile
> @@ -42,6 +42,7 @@ obj-$(CONFIG_RTC_DRV_CADENCE) += rtc-cadence.o
> obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
> obj-$(CONFIG_RTC_DRV_CPCAP) += rtc-cpcap.o
> obj-$(CONFIG_RTC_DRV_CROS_EC) += rtc-cros-ec.o
> +obj-$(CONFIG_RTC_DRV_CV1800) += rtc-cv1800.o
> obj-$(CONFIG_RTC_DRV_DA9052) += rtc-da9052.o
> obj-$(CONFIG_RTC_DRV_DA9055) += rtc-da9055.o
> obj-$(CONFIG_RTC_DRV_DA9063) += rtc-da9063.o
> diff --git a/drivers/rtc/rtc-cv1800.c b/drivers/rtc/rtc-cv1800.c
> new file mode 100644
> index 000000000000..f975b169077a
> --- /dev/null
> +++ b/drivers/rtc/rtc-cv1800.c
> @@ -0,0 +1,240 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * rtc-cv1800.c: RTC driver for Sophgo cv1800 RTC
> + *
> + * Author: Jingbao Qiu <qiujingbao.dlmu@...il.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/rtc.h>
> +
> +#define CTRL 0x08
> +#define ANA_CALIB 0x1000
> +#define SEC_PULSE_GEN 0x1004
> +#define ALARM_TIME 0x1008
> +#define ALARM_ENABLE 0x100C
> +#define SET_SEC_CNTR_VAL 0x1010
> +#define SET_SEC_CNTR_TRIG 0x1014
> +#define SEC_CNTR_VAL 0x1018
> +
> +/*
> + * When in VDDBKUP domain, this MACRO register
> + * does not power down
> + */
> +#define MACRO_RO_T 0x14A8
> +#define MACRO_RG_SET_T 0x1498
> +
> +#define CTRL_MODE_MASK BIT(10)
> +#define CTRL_MODE_OSC32K 0x00UL
> +#define ALARM_ENABLE_MASK BIT(0)
> +#define SET_SEC_CNTR_VAL_INIT GENMASK(29, 28)
> +#define SEC_PULSE_SEL_INNER BIT(31)
> +#define SEC_PULSE_GEN_SEL_MASK GENMASK(30, 0)
> +#define CALIB_SEL_FTUNE_MASK GENMASK(30, 0)
> +#define CALIB_SEL_FTUNE_INNER 0x00UL
> +
> +struct cv1800_rtc_priv {
> + struct rtc_device *rtc_dev;
> + struct regmap *rtc_map;
> + struct clk *clk;
> + int irq;
> +};
> +
> +static const struct regmap_config cv1800_rtc_regmap_config = {
> + .reg_bits = 32,
> + .val_bits = 32,
> + .reg_stride = 4,
> +};
> +
> +static int cv1800_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
> +{
> + struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
> +
> + regmap_write(info->rtc_map, ALARM_ENABLE, enabled);
> +
> + return 0;
> +}
> +
> +static int cv1800_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> + struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
> + unsigned long alarm_time;
> +
> + alarm_time = rtc_tm_to_time64(&alrm->time);
> +
> + cv1800_rtc_alarm_irq_enable(dev, 0);
> +
> + regmap_write(info->rtc_map, ALARM_TIME, alarm_time);
> +
> + cv1800_rtc_alarm_irq_enable(dev, alrm->enabled);
> +
> + return 0;
> +}
> +
> +static int cv1800_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
> +{
> + struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
> + u32 enabled;
> + u32 time;
> +
> + regmap_read(info->rtc_map, ALARM_ENABLE, &enabled);
> +
> + alarm->enabled = enabled & ALARM_ENABLE_MASK;
> +
> + regmap_read(info->rtc_map, ALARM_TIME, &time);
> +
> + rtc_time64_to_tm(time, &alarm->time);
> +
> + return 0;
> +}
> +
> +static void rtc_enable_sec_counter(struct cv1800_rtc_priv *info)
> +{
> + u32 sec_ro_t;
> + u32 sec;
> +
> + /* select inner sec pulse */
> + regmap_update_bits(info->rtc_map, SEC_PULSE_GEN,
> + (u32)(~SEC_PULSE_GEN_SEL_MASK),
> + (u32)(~SEC_PULSE_SEL_INNER));
> +
> + regmap_update_bits(info->rtc_map, ANA_CALIB,
> + (u32)(~CALIB_SEL_FTUNE_MASK),
> + CALIB_SEL_FTUNE_INNER);
> +
> + sec = SET_SEC_CNTR_VAL_INIT;
> +
> + /* load from MACRO register */
> + regmap_read(info->rtc_map, MACRO_RO_T, &sec_ro_t);
> + if (sec_ro_t > (SET_SEC_CNTR_VAL_INIT))
> + sec = sec_ro_t;
> +
> + regmap_write(info->rtc_map, SET_SEC_CNTR_VAL, sec);
> + regmap_write(info->rtc_map, SET_SEC_CNTR_TRIG, 1);
> +}
> +
> +static int cv1800_rtc_read_time(struct device *dev, struct rtc_time *tm)
> +{
> + struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
> + u32 sec;
> +
> + regmap_read(info->rtc_map, SEC_CNTR_VAL, &sec);
> +
> + rtc_time64_to_tm(sec, tm);
> +
> + return 0;
> +}
> +
> +static int cv1800_rtc_set_time(struct device *dev, struct rtc_time *tm)
> +{
> + struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
> + unsigned long sec;
> +
> + sec = rtc_tm_to_time64(tm);
> +
> + regmap_write(info->rtc_map, SET_SEC_CNTR_VAL, sec);
> + regmap_write(info->rtc_map, SET_SEC_CNTR_TRIG, 1);
> +
> + regmap_write(info->rtc_map, MACRO_RG_SET_T, sec);
> +
> + return 0;
> +}
> +
> +static irqreturn_t cv1800_rtc_irq_handler(int irq, void *dev_id)
> +{
> + struct cv1800_rtc_priv *info = dev_id;
> +
> + rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
> +
> + regmap_write(info->rtc_map, ALARM_ENABLE, 0);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static const struct rtc_class_ops cv1800_rtc_ops = {
> + .read_time = cv1800_rtc_read_time,
> + .set_time = cv1800_rtc_set_time,
> + .read_alarm = cv1800_rtc_read_alarm,
> + .set_alarm = cv1800_rtc_set_alarm,
> + .alarm_irq_enable = cv1800_rtc_alarm_irq_enable,
> +};
> +
> +static int cv1800_rtc_probe(struct platform_device *pdev)
> +{
> + struct cv1800_rtc_priv *rtc;
> + u32 ctrl_val;
> + void __iomem *base;
> + int ret;
> +
> + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
> + if (!rtc)
> + return -ENOMEM;
> +
> + base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + rtc->rtc_map = devm_regmap_init_mmio(&pdev->dev, base,
> + &cv1800_rtc_regmap_config);
> + if (IS_ERR(rtc->rtc_map))
> + return PTR_ERR(rtc->rtc_map);
> +
> + rtc->irq = platform_get_irq(pdev, 0);
> + if (rtc->irq < 0)
> + return rtc->irq;
> +
> + rtc->clk = devm_clk_get_enabled(&pdev->dev, NULL);
> + if (IS_ERR(rtc->clk))
> + return dev_err_probe(&pdev->dev, PTR_ERR(rtc->clk),
> + "clk not found\n");
> +
> + platform_set_drvdata(pdev, rtc);
> +
> + device_init_wakeup(&pdev->dev, 1);
> +
> + rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
> + if (IS_ERR(rtc->rtc_dev))
> + return PTR_ERR(rtc->rtc_dev);
> +
> + rtc->rtc_dev->ops = &cv1800_rtc_ops;
> + rtc->rtc_dev->range_max = U32_MAX;
> +
> + ret = devm_request_irq(&pdev->dev, rtc->irq, cv1800_rtc_irq_handler,
> + IRQF_TRIGGER_HIGH, "rtc alarm", rtc);
> + if (ret)
> + return dev_err_probe(&pdev->dev, ret,
> + "cannot register interrupt handler\n");
> +
> + regmap_read(rtc->rtc_map, CTRL, &ctrl_val);
> + ctrl_val &= CTRL_MODE_MASK;
> +
> + if (ctrl_val == CTRL_MODE_OSC32K)
> + rtc_enable_sec_counter(rtc);
> +
> + return devm_rtc_register_device(rtc->rtc_dev);
> +}
> +
> +static const struct of_device_id cv1800_dt_ids[] = {
> + { .compatible = "sophgo,cv1800-rtc" },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, cv1800_dt_ids);
> +
> +static struct platform_driver cv1800_rtc_driver = {
> + .driver = {
> + .name = "sophgo-cv1800-rtc",
> + .of_match_table = cv1800_dt_ids,
> + },
> + .probe = cv1800_rtc_probe,
> +};
> +
> +module_platform_driver(cv1800_rtc_driver);
> +MODULE_AUTHOR("Jingbao Qiu");
> +MODULE_DESCRIPTION("Sophgo cv1800 RTC Driver");
> +MODULE_LICENSE("GPL");
--
Alexander Sverdlin.
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