From patchwork Wed Aug 9 01:15:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacky Huang X-Patchwork-Id: 13347295 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 32F46C001DB for ; Wed, 9 Aug 2023 01:15:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) id 13B8CC433CA; Wed, 9 Aug 2023 01:15:58 +0000 (UTC) Received: from mail-pg1-f177.google.com (mail-pg1-f177.google.com [209.85.215.177]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp.kernel.org (Postfix) with ESMTPS id 94C84C433C8; Wed, 9 Aug 2023 01:15:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.kernel.org 94C84C433C8 Authentication-Results: smtp.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-pg1-f177.google.com with SMTP id 41be03b00d2f7-564ca521549so3279981a12.1; Tue, 08 Aug 2023 18:15:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1691543756; x=1692148556; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=nPNCweX+5ma/GkGVGkz+d+I063Vnz2ba+24+RFVQOm8=; b=YBEElAZ9XtCK4Cd2b/3zMZzs/E7/iE7wsUtNV5tm/9aTeMLQBS9jkTu4uWA24q/ZXA 62QShqlHqpH4cbYgVyeOT6Oza5YzcYRzog+SzDZtu6P/yEJYw2Z3UIeXdWlKBMZv+hf3 5R3U7jfRvEgHLk0Tg7eNt7BkApJe0tm73MPRetyJ0HuqGPNoOohF4AW7jCIJlktaEAQ6 nYetYMJ0eXXpTJg+YOku9OKf32o52X+Qc2mPIJaH3Kg9aTJRxEKJxabMWmA1M2QCaBD7 3/YxOnmW2+BJm8Bw0SDoDY3b13C6VmkuwAdgi+bGlkXWYX54F0pWTk9MFFdI5VQCTZl+ 76UQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691543756; x=1692148556; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=nPNCweX+5ma/GkGVGkz+d+I063Vnz2ba+24+RFVQOm8=; b=fdcL+ZRO98Ow41MTvoP4enRTYf3FM1+IoqGEICx32bZFnTih75j9mlVxsjaHYWpuSX HIeqhh0SCpJnBEbb4ptLDuc8v0TMCjYJ7wavwvEipSvYdigt63sI3IyXSvo1v1yUHuBK /JVsHH7GkqZcSn1pr0QBoRBEYgyGfKRRLoGoBQeXgiYzVlpU5RsgCenpeWXSv/YiHm2H c99eeKMoCYtjEZsoLn3EyWZS8ODqaNeuV+2aLpfrGCC4DRYwHRCZWLUXvwblX9vgJgPf 6JxFRFJ+YSycu97AAGsPzu0F0vf6zifRqtmQ/A4q875XJ1tBqTnNS4fMNBhwcE7LCVIB mqkA== X-Gm-Message-State: AOJu0YyVEzNDOwjoVMAy6cCFR1X6BOih5VG7sE5ZROmvKHc0Ut8eaAG6 NdYq0v/77gWauxVTOEqO58w= X-Google-Smtp-Source: AGHT+IGoV5P8FQ/Uv/2KcsV8fH+WqZH8q+JmsnCATTjJfdRLrh7tOwl+RxZNZQyNyy8Bu2HLwOiBaQ== X-Received: by 2002:a17:90a:72cc:b0:268:1b62:2f6c with SMTP id l12-20020a17090a72cc00b002681b622f6cmr1117935pjk.2.1691543755848; Tue, 08 Aug 2023 18:15:55 -0700 (PDT) Received: from a28aa0606c51.. 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[60.250.192.107]) by smtp.gmail.com with ESMTPSA id t22-20020a1709028c9600b001bc68602e54sm5730449plo.142.2023.08.08.18.15.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Aug 2023 18:15:55 -0700 (PDT) From: Jacky Huang To: a.zummo@towertech.it, alexandre.belloni@bootlin.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org List-Id: Cc: linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, soc@kernel.org, mjchen@nuvoton.com, schung@nuvoton.com, Jacky Huang Subject: [RESEND PATCH v2 3/3] rtc: Add driver for Nuvoton ma35d1 rtc controller Date: Wed, 9 Aug 2023 01:15:42 +0000 Message-Id: <20230809011542.429945-4-ychuang570808@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230809011542.429945-1-ychuang570808@gmail.com> References: <20230809011542.429945-1-ychuang570808@gmail.com> MIME-Version: 1.0 From: Jacky Huang The ma35d1 rtc controller provides real-time and calendar messaging capabilities. It supports programmable time tick and alarm match interrupts. The time and calendar messages are expressed in BCD format. This driver supports the built-in rtc controller of the ma35d1. It enables setting and reading the rtc time and configuring and reading the rtc alarm. Signed-off-by: Jacky Huang --- drivers/rtc/Kconfig | 11 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-ma35d1.c | 355 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 367 insertions(+) create mode 100644 drivers/rtc/rtc-ma35d1.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 05f4b2d66290..95ddd8f616f4 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1929,6 +1929,17 @@ config RTC_DRV_TI_K3 This driver can also be built as a module, if so, the module will be called "rtc-ti-k3". +config RTC_DRV_MA35D1 + tristate "Nuvoton MA35D1 RTC" + depends on ARCH_MA35 || COMPILE_TEST + select REGMAP_MMIO + help + If you say yes here you get support for the Nuvoton MA35D1 + On-Chip Real Time Clock. + + This driver can also be built as a module, if so, the module + will be called "rtc-ma35d1". + comment "HID Sensor RTC drivers" config RTC_DRV_HID_SENSOR_TIME diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index fd209883ee2e..763c9cb5dde1 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -88,6 +88,7 @@ obj-$(CONFIG_RTC_DRV_M41T94) += rtc-m41t94.o obj-$(CONFIG_RTC_DRV_M48T35) += rtc-m48t35.o obj-$(CONFIG_RTC_DRV_M48T59) += rtc-m48t59.o obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o +obj-$(CONFIG_RTC_DRV_MA35D1) += rtc-ma35d1.o obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o obj-$(CONFIG_RTC_DRV_MAX6916) += rtc-max6916.o diff --git a/drivers/rtc/rtc-ma35d1.c b/drivers/rtc/rtc-ma35d1.c new file mode 100644 index 000000000000..f63b484ee37f --- /dev/null +++ b/drivers/rtc/rtc-ma35d1.c @@ -0,0 +1,355 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * RTC driver for Nuvoton MA35D1 + * + * Copyright (C) 2023 Nuvoton Technology Corp. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* MA35D1 RTC Control Registers */ +#define MA35_REG_RTC_INIT 0x00 +#define MA35_REG_RTC_SINFASTS 0x04 +#define MA35_REG_RTC_FREQADJ 0x08 +#define MA35_REG_RTC_TIME 0x0c +#define MA35_REG_RTC_CAL 0x10 +#define MA35_REG_RTC_CLKFMT 0x14 +#define MA35_REG_RTC_WEEKDAY 0x18 +#define MA35_REG_RTC_TALM 0x1c +#define MA35_REG_RTC_CALM 0x20 +#define MA35_REG_RTC_LEAPYEAR 0x24 +#define MA35_REG_RTC_INTEN 0x28 +#define MA35_REG_RTC_INTSTS 0x2c +#define MA35_REG_RTC_TICK 0x30 + +/* register MA35_REG_RTC_INIT */ +#define RTC_INIT_ACTIVE BIT(0) +#define RTC_INIT_MAGIC_CODE 0xa5eb1357 + +/* register MA35_REG_RTC_CLKFMT */ +#define RTC_CLKFMT_24HEN BIT(0) +#define RTC_CLKFMT_DCOMPEN BIT(16) + +/* register MA35_REG_RTC_INTEN */ +#define RTC_INTEN_ALMIEN BIT(0) +#define RTC_INTEN_TICKIEN BIT(1) +#define RTC_INTEN_CLKFIEN BIT(24) +#define RTC_INTEN_CLKSTIEN BIT(25) + +/* register MA35_REG_RTC_INTSTS */ +#define RTC_INTSTS_ALMIF BIT(0) +#define RTC_INTSTS_TICKIF BIT(1) +#define RTC_INTSTS_CLKFIF BIT(24) +#define RTC_INTSTS_CLKSTIF BIT(25) + +#define RTC_INIT_TIMEOUT 250 + +struct ma35_rtc { + int irq_num; + void __iomem *rtc_reg; + struct rtc_device *rtcdev; +}; + +struct ma35_bcd_time { + int bcd_sec; + int bcd_min; + int bcd_hour; + int bcd_mday; + int bcd_mon; + int bcd_year; +}; + +static u32 rtc_reg_read(struct ma35_rtc *p, u32 offset) +{ + return __raw_readl(p->rtc_reg + offset); +} + +static inline void rtc_reg_write(struct ma35_rtc *p, u32 offset, u32 value) +{ + __raw_writel(value, p->rtc_reg + offset); +} + +static irqreturn_t ma35d1_rtc_interrupt(int irq, void *data) +{ + struct ma35_rtc *rtc = (struct ma35_rtc *)data; + unsigned long events = 0, rtc_irq; + + rtc_irq = rtc_reg_read(rtc, MA35_REG_RTC_INTSTS); + + if (rtc_irq & RTC_INTSTS_ALMIF) { + rtc_reg_write(rtc, MA35_REG_RTC_INTSTS, RTC_INTSTS_ALMIF); + events |= RTC_AF | RTC_IRQF; + } + + if (rtc_irq & RTC_INTSTS_TICKIF) { + rtc_reg_write(rtc, MA35_REG_RTC_INTSTS, RTC_INTSTS_TICKIF); + events |= RTC_UF | RTC_IRQF; + } + + rtc_update_irq(rtc->rtcdev, 1, events); + + return IRQ_HANDLED; +} + +static int ma35d1_rtc_init(struct ma35_rtc *rtc, u32 ms_timeout) +{ + const unsigned long timeout = jiffies + msecs_to_jiffies(ms_timeout); + + do { + if (rtc_reg_read(rtc, MA35_REG_RTC_INIT) & RTC_INIT_ACTIVE) + return 0; + + rtc_reg_write(rtc, MA35_REG_RTC_INIT, RTC_INIT_MAGIC_CODE); + + mdelay(1); + + } while (time_before(jiffies, timeout)); + + return -ETIMEDOUT; +} + +static int ma35d1_rtc_bcd2bin(u32 time, u32 cal, u32 wday, struct rtc_time *tm) +{ + tm->tm_mday = bcd2bin(cal >> 0); + tm->tm_mon = bcd2bin(cal >> 8); + tm->tm_mon = tm->tm_mon - 1; + tm->tm_year = bcd2bin(cal >> 16) + 100; + + tm->tm_sec = bcd2bin(time >> 0); + tm->tm_min = bcd2bin(time >> 8); + tm->tm_hour = bcd2bin(time >> 16); + + tm->tm_wday = wday; + + return rtc_valid_tm(tm); +} + +static int ma35d1_rtc_alarm_bcd2bin(u32 talm, u32 calm, struct rtc_time *tm) +{ + tm->tm_mday = bcd2bin(calm >> 0); + tm->tm_mon = bcd2bin(calm >> 8); + tm->tm_mon = tm->tm_mon - 1; + tm->tm_year = bcd2bin(calm >> 16) + 100; + + tm->tm_sec = bcd2bin(talm >> 0); + tm->tm_min = bcd2bin(talm >> 8); + tm->tm_hour = bcd2bin(talm >> 16); + + return rtc_valid_tm(tm); +} + +static void ma35d1_rtc_bin2bcd(struct device *dev, struct rtc_time *settm, + struct ma35_bcd_time *gettm) +{ + gettm->bcd_mday = bin2bcd(settm->tm_mday) << 0; + gettm->bcd_mon = bin2bcd((settm->tm_mon + 1)) << 8; + + if (settm->tm_year < 100) { + dev_warn(dev, "The year will be between 1970-1999, right?\n"); + gettm->bcd_year = bin2bcd(settm->tm_year) << 16; + } else { + gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16; + } + + gettm->bcd_sec = bin2bcd(settm->tm_sec) << 0; + gettm->bcd_min = bin2bcd(settm->tm_min) << 8; + gettm->bcd_hour = bin2bcd(settm->tm_hour) << 16; +} + +static int ma35d1_alarm_irq_enable(struct device *dev, u32 enabled) +{ + struct ma35_rtc *rtc = dev_get_drvdata(dev); + u32 reg_ien; + + reg_ien = rtc_reg_read(rtc, MA35_REG_RTC_INTEN); + + if (enabled) + rtc_reg_write(rtc, MA35_REG_RTC_INTEN, reg_ien | RTC_INTEN_ALMIEN); + else + rtc_reg_write(rtc, MA35_REG_RTC_INTEN, reg_ien & ~RTC_INTEN_ALMIEN); + + return 0; +} + +static int ma35d1_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct ma35_rtc *rtc = dev_get_drvdata(dev); + u32 time, cal, wday; + + time = rtc_reg_read(rtc, MA35_REG_RTC_TIME); + cal = rtc_reg_read(rtc, MA35_REG_RTC_CAL); + wday = rtc_reg_read(rtc, MA35_REG_RTC_WEEKDAY); + + return ma35d1_rtc_bcd2bin(time, cal, wday, tm); +} + +static int ma35d1_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct ma35_rtc *rtc = dev_get_drvdata(dev); + struct ma35_bcd_time gettm; + u32 val; + + ma35d1_rtc_bin2bcd(dev, tm, &gettm); + + val = gettm.bcd_mday | gettm.bcd_mon | gettm.bcd_year; + rtc_reg_write(rtc, MA35_REG_RTC_CAL, val); + + val = gettm.bcd_sec | gettm.bcd_min | gettm.bcd_hour; + rtc_reg_write(rtc, MA35_REG_RTC_TIME, val); + + val = tm->tm_wday; + rtc_reg_write(rtc, MA35_REG_RTC_WEEKDAY, val); + + return 0; +} + +static int ma35d1_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct ma35_rtc *rtc = dev_get_drvdata(dev); + u32 talm, calm; + + talm = rtc_reg_read(rtc, MA35_REG_RTC_TALM); + calm = rtc_reg_read(rtc, MA35_REG_RTC_CALM); + + return ma35d1_rtc_alarm_bcd2bin(talm, calm, &alrm->time); +} + +static int ma35d1_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct ma35_rtc *rtc = dev_get_drvdata(dev); + struct ma35_bcd_time tm; + unsigned long val; + + ma35d1_rtc_bin2bcd(dev, &alrm->time, &tm); + + val = tm.bcd_mday | tm.bcd_mon | tm.bcd_year; + rtc_reg_write(rtc, MA35_REG_RTC_CALM, val); + + val = tm.bcd_sec | tm.bcd_min | tm.bcd_hour; + rtc_reg_write(rtc, MA35_REG_RTC_TALM, val); + + return 0; +} + +static const struct rtc_class_ops ma35d1_rtc_ops = { + .read_time = ma35d1_rtc_read_time, + .set_time = ma35d1_rtc_set_time, + .read_alarm = ma35d1_rtc_read_alarm, + .set_alarm = ma35d1_rtc_set_alarm, + .alarm_irq_enable = ma35d1_alarm_irq_enable, +}; + +static int ma35d1_rtc_probe(struct platform_device *pdev) +{ + struct ma35_rtc *rtc; + struct clk *clk; + u32 regval; + int err; + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + rtc->rtc_reg = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(rtc->rtc_reg)) + return PTR_ERR(rtc->rtc_reg); + + clk = of_clk_get(pdev->dev.of_node, 0); + if (IS_ERR(clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(clk), "failed to find rtc clock\n"); + + err = clk_prepare_enable(clk); + if (err) + return -ENOENT; + + platform_set_drvdata(pdev, rtc); + + rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name, + &ma35d1_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc->rtcdev)) + return dev_err_probe(&pdev->dev, PTR_ERR(rtc->rtcdev), + "failed to register rtc device\n"); + + err = ma35d1_rtc_init(rtc, RTC_INIT_TIMEOUT); + if (err) + return err; + + regval = rtc_reg_read(rtc, MA35_REG_RTC_CLKFMT); + regval |= RTC_CLKFMT_24HEN; + rtc_reg_write(rtc, MA35_REG_RTC_CLKFMT, regval); + + rtc->irq_num = platform_get_irq(pdev, 0); + + err = devm_request_irq(&pdev->dev, rtc->irq_num, ma35d1_rtc_interrupt, + IRQF_NO_SUSPEND, "ma35d1rtc", rtc); + if (err) + return dev_err_probe(&pdev->dev, err, "Failed to request rtc irq\n"); + + regval = rtc_reg_read(rtc, MA35_REG_RTC_INTEN); + regval |= RTC_INTEN_TICKIEN; + rtc_reg_write(rtc, MA35_REG_RTC_INTEN, regval); + + device_init_wakeup(&pdev->dev, true); + + return 0; +} + +static int ma35d1_rtc_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct ma35_rtc *rtc = platform_get_drvdata(pdev); + u32 regval; + + if (device_may_wakeup(&pdev->dev)) + enable_irq_wake(rtc->irq_num); + + regval = rtc_reg_read(rtc, MA35_REG_RTC_INTEN); + regval &= ~RTC_INTEN_TICKIEN; + rtc_reg_write(rtc, MA35_REG_RTC_INTEN, regval); + + return 0; +} + +static int ma35d1_rtc_resume(struct platform_device *pdev) +{ + struct ma35_rtc *rtc = platform_get_drvdata(pdev); + u32 regval; + + if (device_may_wakeup(&pdev->dev)) + disable_irq_wake(rtc->irq_num); + + regval = rtc_reg_read(rtc, MA35_REG_RTC_INTEN); + regval |= RTC_INTEN_TICKIEN; + rtc_reg_write(rtc, MA35_REG_RTC_INTEN, regval); + + return 0; +} + +static const struct of_device_id ma35d1_rtc_of_match[] = { + { .compatible = "nuvoton,ma35d1-rtc", }, + {}, +}; +MODULE_DEVICE_TABLE(of, ma35d1_rtc_of_match); + +static struct platform_driver ma35d1_rtc_driver = { + .suspend = ma35d1_rtc_suspend, + .resume = ma35d1_rtc_resume, + .probe = ma35d1_rtc_probe, + .driver = { + .name = "rtc-ma35d1", + .of_match_table = ma35d1_rtc_of_match, + }, +}; + +module_platform_driver(ma35d1_rtc_driver); + +MODULE_AUTHOR("Min-Jen Chen "); +MODULE_DESCRIPTION("MA35D1 RTC driver"); +MODULE_LICENSE("GPL");