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Sun, 17 Dec 2023 03:10:02 -0800 (PST) From: Jingbao Qiu To: a.zummo@towertech.it, alexandre.belloni@bootlin.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor@kernel.org, conor+dt@kernel.org, chao.wei@sophgo.com, unicorn_wang@outlook.com, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu Cc: linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dlan@gentoo.org, Jingbao Qiu Subject: [PATCH v2 2/3] rtc: sophgo: add rtc support for Sophgo CV1800 SoC Date: Sun, 17 Dec 2023 19:09:51 +0800 Message-Id: <20231217110952.78784-3-qiujingbao.dlmu@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231217110952.78784-1-qiujingbao.dlmu@gmail.com> References: <20231217110952.78784-1-qiujingbao.dlmu@gmail.com> Precedence: bulk X-Mailing-List: linux-rtc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Implement the RTC driver for CV1800, which able to provide time alarm and calibrate functionality. Signed-off-by: Jingbao Qiu --- drivers/rtc/Kconfig | 6 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-cv1800.c | 400 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 407 insertions(+) create mode 100644 drivers/rtc/rtc-cv1800.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 3814e0845e77..bdcd9132ff1a 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1103,6 +1103,12 @@ 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 + Say y here to support the RTC driver for Sophgo 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 7b03c3abfd78..69005a2b7ac6 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..f4c76593ef80 --- /dev/null +++ b/drivers/rtc/rtc-cv1800.c @@ -0,0 +1,400 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * rtc-cv1800.c: RTC driver for Sophgo cv1800 RTC + * + * Author: Jingbao Qiu + */ +#include +#include +#include +#include +#include +#include +#include + +#define ANA_CALIB 0x0 +#define SEC_PULSE_GEN 0x4 +#define ALARM_TIME 0x8 +#define ALARM_ENABLE 0xC +#define SET_SEC_CNTR_VAL 0x10 +#define SET_SEC_CNTR_TRIG 0x14 +#define SEC_CNTR_VAL 0x18 +#define APB_RDATA_SEL 0x3C +#define POR_DB_MAGIC_KEY 0x68 +#define EN_PWR_WAKEUP 0xBC +#define MACRO_DA_CLEAR_ALL 0x480 +#define MACRO_DA_SOC_READY 0x48C +#define MACRO_RO_T 0x4A8 +#define MACRO_RG_SET_T 0x498 + +#define CTRL 0x08 +#define FC_COARSE_EN 0x40 +#define FC_COARSE_CAL 0x44 +#define FC_FINE_EN 0x48 +#define FC_FINE_CAL 0x50 +#define CTRL_MODE_MASK BIT(10) +#define CTRL_MODE_OSC32K 0x00UL +#define CTRL_MODE_XTAL32K BIT(0) + +#define FC_COARSE_CAL_VAL_SHIFT 0 +#define FC_COARSE_CAL_VAL_MASK GENMASK(15, 0) +#define FC_COARSE_CAL_TIME_SHIFT 16 +#define FC_COARSE_CAL_TIME_MASK GENMASK(31, 16) +#define FC_FINE_CAL_VAL_SHIFT 0 +#define FC_FINE_CAL_VAL_MASK GENMASK(23, 0) +#define FC_FINE_CAL_TIME_SHIFT 24 +#define FC_FINE_CAL_TIME_MASK GENMASK(31, 24) + +#define SEC_PULSE_GEN_INT_SHIFT 0 +#define SEC_PULSE_GEN_INT_MASK GENMASK(7, 0) +#define SEC_PULSE_GEN_FRAC_SHIFT 8 +#define SEC_PULSE_GEN_FRAC_MASK GENMASK(24, 8) +#define SEC_PULSE_GEN_SEL_SHIFT 31 +#define SEC_PULSE_GEN_SEL_MASK GENMASK(30, 0) + +#define CALIB_INIT_VAL (BIT(8) || BIT(16)) +#define CALIB_SEL_FTUNE_MASK GENMASK(30, 0) +#define CALIB_OFFSET_INIT 128 +#define CALIB_OFFSET_SHIFT BIT(0) +#define CALIB_FREQ 256000000000 +#define CALIB_FRAC_EXT 10000 +#define CALIB_FREQ_NS 40 +#define CALIB_FREQ_MULT 256 +#define CALIB_FC_COARSE_PLUS_OFFSET 770 +#define CALIB_FC_COARSE_SUB_OFFSET 755 + +#define REG_ENABLE_FUN BIT(0) +#define REG_DISABLE_FUN 0x00UL +#define REG_INIT_TIMEOUT 100 +#define SEC_MAX_VAL 0xFFFFFFFF +#define ALARM_ENABLE_MASK BIT(0) +#define SET_SEC_CNTR_VAL_UPDATE (BIT(28) || BIT(29)) +#define DEALY_TIME_PREPARE 400 +#define DEALY_TIME_LOOP 100 + +struct cv1800_priv { + struct rtc_device *dev; + void __iomem *base_data; + void __iomem *base_ctrl; + struct clk *clk; + spinlock_t rtc_lock; + int irq; +}; + +static int cv1800_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + struct cv1800_priv *info = dev_get_drvdata(dev); + + if (enabled) + writel(REG_ENABLE_FUN, info->base_data + ALARM_ENABLE); + else + writel(REG_DISABLE_FUN, info->base_data + ALARM_ENABLE); + + return 0; +} + +static int cv1800_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct cv1800_priv *info = dev_get_drvdata(dev); + unsigned long alarm_time; + + alarm_time = rtc_tm_to_time64(&alrm->time); + + if (alarm_time > SEC_MAX_VAL) + return -EINVAL; + + writel(REG_DISABLE_FUN, info->base_data + ALARM_ENABLE); + + udelay(DEALY_TIME_PREPARE); + + writel(alarm_time, info->base_data + ALARM_TIME); + writel(REG_ENABLE_FUN, info->base_data + ALARM_ENABLE); + + readl(info->base_data + SEC_CNTR_VAL); + + return 0; +} + +static int cv1800_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct cv1800_priv *info = dev_get_drvdata(dev); + + alarm->enabled = readl(info->base_data + ALARM_ENABLE) & + ALARM_ENABLE_MASK; + + rtc_time64_to_tm(readl(info->base_data + ALARM_TIME), &alarm->time); + + return 0; +} + +static int cv1800_rtc_32k_coarse_val_calib(struct cv1800_priv *info) +{ + uint32_t calib_val = 0; + uint32_t coarse_val = 0; + uint32_t coarse_time_now = 0; + uint32_t coarse_time_next = 0; + uint32_t offset = CALIB_OFFSET_INIT; + uint32_t timeout = REG_INIT_TIMEOUT; + uint32_t get_val_timeout; + uint32_t sec_pulse_val; + + writel(CALIB_INIT_VAL, info->base_data + ANA_CALIB); + udelay(DEALY_TIME_PREPARE); + + /* Select 32K OSC tuning val source from sys */ + sec_pulse_val = readl(info->base_data + SEC_PULSE_GEN) & + SEC_PULSE_GEN_SEL_MASK; + writel(sec_pulse_val, info->base_data + SEC_PULSE_GEN); + + calib_val = readl(info->base_data + ANA_CALIB); + + writel(REG_ENABLE_FUN, info->base_ctrl + FC_COARSE_EN); + + while (--timeout) { + coarse_time_now = readl(info->base_ctrl + FC_COARSE_CAL) >> + FC_COARSE_CAL_TIME_SHIFT; + + get_val_timeout = REG_INIT_TIMEOUT; + + while (coarse_time_next <= coarse_time_now && + --get_val_timeout) { + coarse_time_next = + readl(info->base_ctrl + FC_COARSE_CAL) >> + FC_COARSE_CAL_TIME_SHIFT; + udelay(DEALY_TIME_LOOP); + } + + if (!get_val_timeout) + return -1; + + udelay(DEALY_TIME_PREPARE); + + coarse_val = readl(info->base_ctrl + FC_COARSE_CAL) & + FC_COARSE_CAL_VAL_MASK; + + if (coarse_val > CALIB_FC_COARSE_PLUS_OFFSET) { + calib_val += offset; + offset >>= CALIB_OFFSET_SHIFT; + writel(calib_val, info->base_data + ANA_CALIB); + } else if (coarse_val < CALIB_FC_COARSE_SUB_OFFSET) { + calib_val -= offset; + offset >>= CALIB_OFFSET_SHIFT; + writel(calib_val, info->base_data + ANA_CALIB); + } else { + writel(REG_DISABLE_FUN, info->base_ctrl + FC_COARSE_EN); + break; + } + + if (offset == 0) + return -1; + } + + return 0; +} + +static int cv1800_rtc_32k_fine_val_calib(struct cv1800_priv *info) +{ + uint32_t fc_val; + uint64_t freq = CALIB_FREQ; + uint32_t sec_cnt; + uint32_t timeout = REG_INIT_TIMEOUT; + uint32_t fc_time_now = 0; + uint32_t fc_time_next = 0; + + writel(REG_ENABLE_FUN, info->base_ctrl + FC_FINE_EN); + + fc_time_now = readl(info->base_ctrl + FC_FINE_CAL) >> + FC_FINE_CAL_TIME_SHIFT; + + while (fc_time_next <= fc_time_now && --timeout) { + fc_time_next = readl(info->base_ctrl + FC_FINE_CAL) >> + FC_FINE_CAL_TIME_SHIFT; + udelay(DEALY_TIME_LOOP); + } + + if (!timeout) + return -1; + + fc_val = readl(info->base_ctrl + FC_FINE_CAL) & FC_FINE_CAL_VAL_MASK; + + do_div(freq, CALIB_FREQ_NS); + freq = freq * CALIB_FRAC_EXT; + do_div(freq, fc_val); + + sec_cnt = ((do_div(freq, CALIB_FRAC_EXT) * CALIB_FREQ_MULT) / + CALIB_FRAC_EXT & + SEC_PULSE_GEN_INT_MASK) + + (freq << SEC_PULSE_GEN_FRAC_SHIFT); + + writel(sec_cnt, info->base_data + SEC_PULSE_GEN); + writel(REG_DISABLE_FUN, info->base_ctrl + FC_FINE_EN); + + return 0; +} + +static void rtc_enable_sec_counter(struct cv1800_priv *info) +{ + uint32_t val; + + /* select inner sec pulse and select reg set calibration val */ + val = readl(info->base_data + SEC_PULSE_GEN) & SEC_PULSE_GEN_SEL_MASK; + writel(val, info->base_data + SEC_PULSE_GEN); + + val = readl(info->base_data + ANA_CALIB) & CALIB_SEL_FTUNE_MASK; + writel(val, info->base_data + ANA_CALIB); + + readl(info->base_data + SEC_CNTR_VAL); + writel(REG_DISABLE_FUN, info->base_data + ALARM_ENABLE); +} + +static int cv1800_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct cv1800_priv *info = dev_get_drvdata(dev); + unsigned long sec; + unsigned long sec_ro_t; + unsigned long flag; + + spin_lock_irqsave(&info->rtc_lock, flag); + + sec = readl(info->base_data + SEC_CNTR_VAL); + sec_ro_t = readl(info->base_data + MACRO_RO_T); + + if (sec_ro_t > SET_SEC_CNTR_VAL_UPDATE) { + sec = sec_ro_t; + writel(sec, info->base_data + SET_SEC_CNTR_VAL); + writel(REG_ENABLE_FUN, info->base_data + SET_SEC_CNTR_TRIG); + } + + spin_unlock_irqrestore(&info->rtc_lock, flag); + + rtc_time64_to_tm(sec, tm); + + return 0; +} + +static int cv1800_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct cv1800_priv *info = dev_get_drvdata(dev); + unsigned long sec; + int ret; + unsigned long flag; + + ret = rtc_valid_tm(tm); + if (ret) + return ret; + + sec = rtc_tm_to_time64(tm); + + spin_lock_irqsave(&info->rtc_lock, flag); + + writel(sec, info->base_data + SET_SEC_CNTR_VAL); + writel(REG_ENABLE_FUN, info->base_data + SET_SEC_CNTR_TRIG); + + writel(sec, info->base_data + MACRO_RG_SET_T); + + spin_unlock_irqrestore(&info->rtc_lock, flag); + + return 0; +} + +static irqreturn_t cv1800_irq_handler(int irq, void *dev_id) +{ + struct device *dev = dev_id; + struct cv1800_priv *info = dev_get_drvdata(dev); + struct rtc_wkalrm alrm; + + writel(REG_DISABLE_FUN, info->base_data + ALARM_ENABLE); + + rtc_read_alarm(info->dev, &alrm); + alrm.enabled = 0; + rtc_set_alarm(info->dev, &alrm); + + return IRQ_HANDLED; +} + +static const struct rtc_class_ops cv800b_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_priv *rtc; + int ret; + + rtc = devm_kzalloc(&pdev->dev, sizeof(struct cv1800_priv), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + rtc->base_ctrl = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(rtc->base_ctrl)) + return PTR_ERR(rtc->base_ctrl); + + rtc->base_data = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(rtc->base_data)) + return PTR_ERR(rtc->base_data); + + rtc->irq = platform_get_irq(pdev, 0); + if (rtc->irq < 0) + return rtc->irq; + + ret = devm_request_irq(&pdev->dev, rtc->irq, cv1800_irq_handler, + IRQF_TRIGGER_HIGH, "alarm", &pdev->dev); + if (ret) + return dev_err_probe(&pdev->dev, ret, + "cannot register interrupt handler\n"); + + 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); + + spin_lock_init(&rtc->rtc_lock); + + rtc->dev = devm_rtc_device_register(&pdev->dev, dev_name(&pdev->dev), + &cv800b_ops, THIS_MODULE); + if (IS_ERR(rtc->dev)) + return dev_err_probe(&pdev->dev, PTR_ERR(rtc->dev), + "can't register rtc device\n"); + + /* if use internal clk,so coarse calibrate rtc */ + if ((readl(rtc->base_ctrl + CTRL) & CTRL_MODE_MASK) == + CTRL_MODE_OSC32K) { + ret = cv1800_rtc_32k_coarse_val_calib(rtc); + if (ret) + dev_err(&pdev->dev, "failed to coarse RTC val !\n"); + + ret = cv1800_rtc_32k_fine_val_calib(rtc); + if (ret) + dev_err(&pdev->dev, "failed to fine RTC val !\n"); + } + + rtc_enable_sec_counter(rtc); + + return 0; +} + +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_driver = { + .driver = { + .name = "cv1800-rtc", + .of_match_table = cv1800_dt_ids, + }, + .probe = cv1800_rtc_probe, +}; + +module_platform_driver(cv1800_driver); +MODULE_AUTHOR("Jingbao Qiu"); +MODULE_DESCRIPTION("Sophgo CV1800 RTC Driver"); +MODULE_LICENSE("GPL");