From patchwork Fri May 13 11:03:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12848672 X-Patchwork-Delegate: geert@linux-m68k.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 170B7C4332F for ; Fri, 13 May 2022 11:03:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379686AbiEMLDl (ORCPT ); Fri, 13 May 2022 07:03:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379709AbiEMLDk (ORCPT ); Fri, 13 May 2022 07:03:40 -0400 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70E4F2A28ED; Fri, 13 May 2022 04:03:38 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id F144A20003; Fri, 13 May 2022 11:03:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1652439816; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8ahdxlylHUe3mADgzeD98ByHKZe3nsmtka5ti0feGmk=; b=HuYnnx07zmqCg9+uuHwAC60uFb6rx3ktyi8YPR+1CaAmYtXAmazIY0T7SbftMDwrATl/xm 1uGFjOWzEfg4E6BaasG4YXKcXtQqgDw54UeS8OHgQL+rm6mc3tLybRB6wl1lmaxaJLnS3u 1TJBboUFt08dE/OjLtF9QC080EEjKa22lryVGaj2/G+ipxLKldTaPE/uhYT4UNIfulKvNn cNvuxeFyZZsAfKXt1xH4NMW3Oeoogp12tDoMKCo52bPG6VFGkOkBg/9QRzyuwn3OekLLPi HAcJmlyUQfvhYFHMLRodHaDbj03wGnpIGvh1eEMhTC8peItI5eOa+XqswoAWBQ== From: Miquel Raynal To: Alessandro Zummo , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Geert Uytterhoeven , Magnus Damm Cc: Miquel Raynal , linux-rtc@vger.kernel.org, linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, Gareth Williams , Milan Stevanovic , Jimmy Lalande , Pascal Eberhard , Thomas Petazzoni , Herve Codina , Clement Leger , Krzysztof Kozlowski Subject: [PATCH v6 1/5] dt-bindings: rtc: rzn1: Describe the RZN1 RTC Date: Fri, 13 May 2022 13:03:23 +0200 Message-Id: <20220513110327.261652-2-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220513110327.261652-1-miquel.raynal@bootlin.com> References: <20220513110327.261652-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Add new binding file for this RTC. Signed-off-by: Miquel Raynal Reviewed-by: Krzysztof Kozlowski Reviewed-by: Geert Uytterhoeven --- .../bindings/rtc/renesas,rzn1-rtc.yaml | 70 +++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml diff --git a/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml b/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml new file mode 100644 index 000000000000..2d4741f51663 --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml @@ -0,0 +1,70 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/rtc/renesas,rzn1-rtc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Renesas RZ/N1 SoCs Real-Time Clock DT bindings + +maintainers: + - Miquel Raynal + +allOf: + - $ref: rtc.yaml# + +properties: + compatible: + items: + - enum: + - renesas,r9a06g032-rtc + - const: renesas,rzn1-rtc + + reg: + maxItems: 1 + + interrupts: + minItems: 3 + maxItems: 3 + + interrupt-names: + items: + - const: alarm + - const: timer + - const: pps + + clocks: + maxItems: 1 + + clock-names: + const: hclk + + power-domains: + maxItems: 1 + +required: + - compatible + - reg + - interrupts + - interrupt-names + - clocks + - clock-names + - power-domains + +unevaluatedProperties: false + +examples: + - | + #include + #include + rtc@40006000 { + compatible = "renesas,r9a06g032-rtc", "renesas,rzn1-rtc"; + reg = <0x40006000 0x1000>; + interrupts = , + , + ; + interrupt-names = "alarm", "timer", "pps"; + clocks = <&sysctrl R9A06G032_HCLK_RTC>; + clock-names = "hclk"; + power-domains = <&sysctrl>; + start-year = <2000>; + }; From patchwork Fri May 13 11:03:24 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12848673 X-Patchwork-Delegate: geert@linux-m68k.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C30C7C433F5 for ; Fri, 13 May 2022 11:03:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379718AbiEMLDq (ORCPT ); Fri, 13 May 2022 07:03:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379703AbiEMLDo (ORCPT ); Fri, 13 May 2022 07:03:44 -0400 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [IPv6:2001:4b98:dc4:8::227]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9E8B32A2F67; Fri, 13 May 2022 04:03:40 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id D8C542000B; Fri, 13 May 2022 11:03:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1652439819; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wNvmgVk/r5PeQaJezCbA6N7Zc9AeCBsGjvVZy5x3Md8=; b=Hi7Q8vC4wg4xpysfLUYB1CQJWRCX051m3p7gaOcpuAeN6LCAOvJ9G1hLbOykPtqxujGJqA itCW6HVGklp+X8meZzWFp2ZFgT7UXfJaXoGATP+Hqr6lCo3tE9xqTFb6mHoCLyv9gbHk5b ND5e7kmF1PmYxx2kdEzNQkB5B+ABRbAr5DTBiXjkPmRcL2yhJQy1UPG3DQCS6Wr8GU1xm9 Ti02aQe4tGbQF1fqSyo9nlN8oA4sm/+ifWBqwIYXY0CDxi5x//RPEBNroGAYD/a0zAsMBN YShVwgBU9kVbOTo5oOx1KGuwsqt5AtPSrECZK1fDRDkUQgBHwJ9dKeWUvWlE1g== From: Miquel Raynal To: Alessandro Zummo , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Geert Uytterhoeven , Magnus Damm Cc: Miquel Raynal , linux-rtc@vger.kernel.org, linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, Gareth Williams , Milan Stevanovic , Jimmy Lalande , Pascal Eberhard , Thomas Petazzoni , Herve Codina , Clement Leger , Michel Pollet Subject: [PATCH v6 2/5] rtc: rzn1: Add new RTC driver Date: Fri, 13 May 2022 13:03:24 +0200 Message-Id: <20220513110327.261652-3-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220513110327.261652-1-miquel.raynal@bootlin.com> References: <20220513110327.261652-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org From: Michel Pollet Add a basic RTC driver for the RZ/N1. Signed-off-by: Michel Pollet Co-developed-by: Miquel Raynal Signed-off-by: Miquel Raynal --- drivers/rtc/Kconfig | 7 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-rzn1.c | 245 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 253 insertions(+) create mode 100644 drivers/rtc/rtc-rzn1.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 41c65b4d2baf..a00f901b5c1d 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1548,6 +1548,13 @@ config RTC_DRV_RS5C313 help If you say yes here you get support for the Ricoh RS5C313 RTC chips. +config RTC_DRV_RZN1 + tristate "Renesas RZ/N1 RTC" + depends on ARCH_RZN1 || COMPILE_TEST + depends on OF && HAS_IOMEM + help + If you say yes here you get support for the Renesas RZ/N1 RTC. + config RTC_DRV_GENERIC tristate "Generic RTC support" # Please consider writing a new RTC driver instead of using the generic diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 2d827d8261d5..fb04467b652d 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -151,6 +151,7 @@ obj-$(CONFIG_RTC_DRV_RX6110) += rtc-rx6110.o obj-$(CONFIG_RTC_DRV_RX8010) += rtc-rx8010.o obj-$(CONFIG_RTC_DRV_RX8025) += rtc-rx8025.o obj-$(CONFIG_RTC_DRV_RX8581) += rtc-rx8581.o +obj-$(CONFIG_RTC_DRV_RZN1) += rtc-rzn1.o obj-$(CONFIG_RTC_DRV_S35390A) += rtc-s35390a.o obj-$(CONFIG_RTC_DRV_S3C) += rtc-s3c.o obj-$(CONFIG_RTC_DRV_S5M) += rtc-s5m.o diff --git a/drivers/rtc/rtc-rzn1.c b/drivers/rtc/rtc-rzn1.c new file mode 100644 index 000000000000..685cba87cd90 --- /dev/null +++ b/drivers/rtc/rtc-rzn1.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Renesas RZ/N1 Real Time Clock interface for Linux + * + * Copyright: + * - 2014 Renesas Electronics Europe Limited + * - 2022 Schneider Electric + * + * Authors: + * - Michel Pollet , + * - Miquel Raynal + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RZN1_RTC_CTL0 0x00 +#define RZN1_RTC_CTL0_SLSB_SUBU 0 +#define RZN1_RTC_CTL0_SLSB_SCMP BIT(4) +#define RZN1_RTC_CTL0_AMPM BIT(5) +#define RZN1_RTC_CTL0_CE BIT(7) + +#define RZN1_RTC_CTL1 0x04 +#define RZN1_RTC_CTL1_ALME BIT(4) + +#define RZN1_RTC_CTL2 0x08 +#define RZN1_RTC_CTL2_WAIT BIT(0) +#define RZN1_RTC_CTL2_WST BIT(1) +#define RZN1_RTC_CTL2_WUST BIT(5) +#define RZN1_RTC_CTL2_STOPPED (RZN1_RTC_CTL2_WAIT | RZN1_RTC_CTL2_WST) + +#define RZN1_RTC_SEC 0x14 +#define RZN1_RTC_MIN 0x18 +#define RZN1_RTC_HOUR 0x1c +#define RZN1_RTC_WEEK 0x20 +#define RZN1_RTC_DAY 0x24 +#define RZN1_RTC_MONTH 0x28 +#define RZN1_RTC_YEAR 0x2c + +#define RZN1_RTC_SUBU 0x38 +#define RZN1_RTC_SUBU_DEV BIT(7) +#define RZN1_RTC_SUBU_DECR BIT(6) + +#define RZN1_RTC_ALM 0x40 +#define RZN1_RTC_ALH 0x44 +#define RZN1_RTC_ALW 0x48 + +#define RZN1_RTC_SECC 0x4c +#define RZN1_RTC_MINC 0x50 +#define RZN1_RTC_HOURC 0x54 +#define RZN1_RTC_WEEKC 0x58 +#define RZN1_RTC_DAYC 0x5c +#define RZN1_RTC_MONTHC 0x60 +#define RZN1_RTC_YEARC 0x64 + +struct rzn1_rtc { + struct rtc_device *rtcdev; + void __iomem *base; + struct clk *clk; +}; + +static void rzn1_rtc_get_time_snapshot(struct rzn1_rtc *rtc, struct rtc_time *tm) +{ + tm->tm_sec = readl(rtc->base + RZN1_RTC_SECC); + tm->tm_min = readl(rtc->base + RZN1_RTC_MINC); + tm->tm_hour = readl(rtc->base + RZN1_RTC_HOURC); + tm->tm_wday = readl(rtc->base + RZN1_RTC_WEEKC); + tm->tm_mday = readl(rtc->base + RZN1_RTC_DAYC); + tm->tm_mon = readl(rtc->base + RZN1_RTC_MONTHC); + tm->tm_year = readl(rtc->base + RZN1_RTC_YEARC); +} + +static unsigned int rzn1_rtc_tm_to_wday(struct rtc_time *tm) +{ + time64_t time; + unsigned int days; + u32 secs; + + time = rtc_tm_to_time64(tm); + days = div_s64_rem(time, 86400, &secs); + + /* day of the week, 1970-01-01 was a Thursday */ + return (days + 4) % 7; +} + +static int rzn1_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct rzn1_rtc *rtc = dev_get_drvdata(dev); + u32 val, secs; + + /* + * The RTC was not started or is stopped and thus does not carry the + * proper time/date. + */ + val = readl(rtc->base + RZN1_RTC_CTL2); + if (val & RZN1_RTC_CTL2_STOPPED) + return -EINVAL; + + rzn1_rtc_get_time_snapshot(rtc, tm); + secs = readl(rtc->base + RZN1_RTC_SECC); + if (tm->tm_sec != secs) + rzn1_rtc_get_time_snapshot(rtc, tm); + + tm->tm_sec = bcd2bin(tm->tm_sec); + tm->tm_min = bcd2bin(tm->tm_min); + tm->tm_hour = bcd2bin(tm->tm_hour); + tm->tm_wday = bcd2bin(tm->tm_wday); + tm->tm_mday = bcd2bin(tm->tm_mday); + tm->tm_mon = bcd2bin(tm->tm_mon); + tm->tm_year = bcd2bin(tm->tm_year); + + return 0; +} + +static int rzn1_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct rzn1_rtc *rtc = dev_get_drvdata(dev); + u32 val; + int ret; + + tm->tm_sec = bin2bcd(tm->tm_sec); + tm->tm_min = bin2bcd(tm->tm_min); + tm->tm_hour = bin2bcd(tm->tm_hour); + tm->tm_wday = bin2bcd(rzn1_rtc_tm_to_wday(tm)); + tm->tm_mday = bin2bcd(tm->tm_mday); + tm->tm_mon = bin2bcd(tm->tm_mon); + tm->tm_year = bin2bcd(tm->tm_year); + + val = readl(rtc->base + RZN1_RTC_CTL2); + if (!(val & RZN1_RTC_CTL2_STOPPED)) { + /* Hold the counter if it was counting up */ + writel(RZN1_RTC_CTL2_WAIT, rtc->base + RZN1_RTC_CTL2); + + /* Wait for the counter to stop: two 32k clock cycles */ + usleep_range(61, 100); + ret = readl_poll_timeout(rtc->base + RZN1_RTC_CTL2, val, + val & RZN1_RTC_CTL2_WST, 0, 100); + if (ret) + return ret; + } + + writel(tm->tm_sec, rtc->base + RZN1_RTC_SEC); + writel(tm->tm_min, rtc->base + RZN1_RTC_MIN); + writel(tm->tm_hour, rtc->base + RZN1_RTC_HOUR); + writel(tm->tm_wday, rtc->base + RZN1_RTC_WEEK); + writel(tm->tm_mday, rtc->base + RZN1_RTC_DAY); + writel(tm->tm_mon, rtc->base + RZN1_RTC_MONTH); + writel(tm->tm_year, rtc->base + RZN1_RTC_YEAR); + writel(0, rtc->base + RZN1_RTC_CTL2); + + return 0; +} + +static const struct rtc_class_ops rzn1_rtc_ops = { + .read_time = rzn1_rtc_read_time, + .set_time = rzn1_rtc_set_time, +}; + +static int rzn1_rtc_probe(struct platform_device *pdev) +{ + struct rzn1_rtc *rtc; + int ret; + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + platform_set_drvdata(pdev, rtc); + + rtc->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(rtc->base)) + return dev_err_probe(&pdev->dev, PTR_ERR(rtc->base), "Missing reg\n"); + + rtc->rtcdev = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(rtc->rtcdev)) + return PTR_ERR(rtc); + + rtc->rtcdev->range_min = RTC_TIMESTAMP_BEGIN_2000; + rtc->rtcdev->range_max = RTC_TIMESTAMP_END_2099; + rtc->rtcdev->ops = &rzn1_rtc_ops; + clear_bit(RTC_FEATURE_ALARM, rtc->rtcdev->features); + clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->rtcdev->features); + + devm_pm_runtime_enable(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); + if (ret < 0) + return ret; + + /* + * Ensure the clock counter is enabled. + * Set 24-hour mode and possible oscillator offset compensation in SUBU mode. + */ + writel(RZN1_RTC_CTL0_CE | RZN1_RTC_CTL0_AMPM | RZN1_RTC_CTL0_SLSB_SUBU, + rtc->base + RZN1_RTC_CTL0); + + /* Disable all interrupts */ + writel(0, rtc->base + RZN1_RTC_CTL1); + + ret = devm_rtc_register_device(rtc->rtcdev); + if (ret) + goto dis_runtime_pm; + + return 0; + +dis_runtime_pm: + pm_runtime_put(&pdev->dev); + + return ret; +} + +static int rzn1_rtc_remove(struct platform_device *pdev) +{ + pm_runtime_put(&pdev->dev); + + return 0; +} + +static const struct of_device_id rzn1_rtc_of_match[] = { + { .compatible = "renesas,rzn1-rtc" }, + {}, +}; +MODULE_DEVICE_TABLE(of, rzn1_rtc_of_match); + +static struct platform_driver rzn1_rtc_driver = { + .probe = rzn1_rtc_probe, + .remove = rzn1_rtc_remove, + .driver = { + .name = "rzn1-rtc", + .owner = THIS_MODULE, + .of_match_table = rzn1_rtc_of_match, + }, +}; +module_platform_driver(rzn1_rtc_driver); + +MODULE_AUTHOR("Michel Pollet X-Patchwork-Id: 12848674 X-Patchwork-Delegate: geert@linux-m68k.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49A0EC43217 for ; Fri, 13 May 2022 11:03:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379700AbiEMLDr (ORCPT ); Fri, 13 May 2022 07:03:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379691AbiEMLDp (ORCPT ); Fri, 13 May 2022 07:03:45 -0400 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5ECB92A28EE; Fri, 13 May 2022 04:03:42 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id 3F7622000D; Fri, 13 May 2022 11:03:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1652439820; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Aa5LvdpLvgqB9bJWjFNskoQwvcyOVkDYYmbCzOXgDQk=; b=PLAlBphsh+GqpyXIrVpV6OZx92fP9kaLloD8PJXRguz9v4viKifMaYh3IlB64bps2bzIq2 ASnYPzp0kf2fdnDwMB02Jz/4KTvfErYAzzrALawwWYvAw8BtQxYZWdyEAI7F9u0TM6Fhqy MjMbpxRZ/3hZ1HLiF0snH3MSo1kJw6rv1t8T9n1CxEDSHVu2S50AY6tpFqI5n+AMMMev0k 0SWB6zUjMJs/0ps0PqBRrqmO79dtrhCCc1MFd06rtsJQVmJaYgDZYEpd/23YeCR0k/V47m d2J5FSyIaxY8Y9AXi8YCy5lpzZUtuBDdPB7WMcH+6cUvsh6sJrIrRq/AVM5GMQ== From: Miquel Raynal To: Alessandro Zummo , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Geert Uytterhoeven , Magnus Damm Cc: Miquel Raynal , linux-rtc@vger.kernel.org, linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, Gareth Williams , Milan Stevanovic , Jimmy Lalande , Pascal Eberhard , Thomas Petazzoni , Herve Codina , Clement Leger Subject: [PATCH v6 3/5] rtc: rzn1: Add alarm support Date: Fri, 13 May 2022 13:03:25 +0200 Message-Id: <20220513110327.261652-4-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220513110327.261652-1-miquel.raynal@bootlin.com> References: <20220513110327.261652-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org The RZN1 RTC can trigger an interrupt when reaching a particular date up to 7 days ahead. Bring support for this alarm. One drawback though, the granularity is about a minute. Signed-off-by: Miquel Raynal --- drivers/rtc/rtc-rzn1.c | 106 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 105 insertions(+), 1 deletion(-) diff --git a/drivers/rtc/rtc-rzn1.c b/drivers/rtc/rtc-rzn1.c index 685cba87cd90..7ee190daa651 100644 --- a/drivers/rtc/rtc-rzn1.c +++ b/drivers/rtc/rtc-rzn1.c @@ -158,14 +158,107 @@ static int rzn1_rtc_set_time(struct device *dev, struct rtc_time *tm) return 0; } +static irqreturn_t rzn1_rtc_alarm_irq(int irq, void *dev_id) +{ + struct rzn1_rtc *rtc = dev_id; + + rtc_update_irq(rtc->rtcdev, 1, RTC_AF | RTC_IRQF); + + return IRQ_HANDLED; +} + +static int rzn1_rtc_alarm_irq_enable(struct device *dev, unsigned int enable) +{ + struct rzn1_rtc *rtc = dev_get_drvdata(dev); + u32 ctl1 = readl(rtc->base + RZN1_RTC_CTL1); + + if (enable) + ctl1 |= RZN1_RTC_CTL1_ALME; + else + ctl1 &= ~RZN1_RTC_CTL1_ALME; + + writel(ctl1, rtc->base + RZN1_RTC_CTL1); + + return 0; +} + +static int rzn1_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct rzn1_rtc *rtc = dev_get_drvdata(dev); + struct rtc_time *tm = &alrm->time; + unsigned int min, hour, wday, delta_days; + time64_t alarm; + u32 ctl1; + int ret; + + ret = rzn1_rtc_read_time(dev, tm); + if (ret) + return ret; + + min = readl(rtc->base + RZN1_RTC_ALM); + hour = readl(rtc->base + RZN1_RTC_ALH); + wday = readl(rtc->base + RZN1_RTC_ALW); + + tm->tm_sec = 0; + tm->tm_min = bcd2bin(min); + tm->tm_hour = bcd2bin(hour); + delta_days = ((fls(wday) - 1) - tm->tm_wday + 7) % 7; + tm->tm_wday = fls(wday) - 1; + + if (delta_days) { + alarm = rtc_tm_to_time64(tm) + (delta_days * 86400); + rtc_time64_to_tm(alarm, tm); + } + + ctl1 = readl(rtc->base + RZN1_RTC_CTL1); + alrm->enabled = !!(ctl1 & RZN1_RTC_CTL1_ALME); + + return 0; +} + +static int rzn1_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct rzn1_rtc *rtc = dev_get_drvdata(dev); + struct rtc_time *tm = &alrm->time, tm_now; + unsigned long alarm, farest; + unsigned int days_ahead, wday; + int ret; + + ret = rzn1_rtc_read_time(dev, &tm_now); + if (ret) + return ret; + + /* We cannot set alarms more than one week ahead */ + farest = rtc_tm_to_time64(&tm_now) + (7 * 86400); + alarm = rtc_tm_to_time64(tm); + if (time_after(alarm, farest)) + return -ERANGE; + + /* Convert alarm day into week day */ + days_ahead = tm->tm_mday - tm_now.tm_mday; + wday = (tm_now.tm_wday + days_ahead) % 7; + + writel(bin2bcd(tm->tm_min), rtc->base + RZN1_RTC_ALM); + writel(bin2bcd(tm->tm_hour), rtc->base + RZN1_RTC_ALH); + writel(BIT(wday), rtc->base + RZN1_RTC_ALW); + + rzn1_rtc_alarm_irq_enable(dev, alrm->enabled); + + return 0; +} + static const struct rtc_class_ops rzn1_rtc_ops = { .read_time = rzn1_rtc_read_time, .set_time = rzn1_rtc_set_time, + .read_alarm = rzn1_rtc_read_alarm, + .set_alarm = rzn1_rtc_set_alarm, + .alarm_irq_enable = rzn1_rtc_alarm_irq_enable, }; static int rzn1_rtc_probe(struct platform_device *pdev) { struct rzn1_rtc *rtc; + int alarm_irq; int ret; rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); @@ -178,6 +271,10 @@ static int rzn1_rtc_probe(struct platform_device *pdev) if (IS_ERR(rtc->base)) return dev_err_probe(&pdev->dev, PTR_ERR(rtc->base), "Missing reg\n"); + alarm_irq = platform_get_irq(pdev, 0); + if (alarm_irq < 0) + return alarm_irq; + rtc->rtcdev = devm_rtc_allocate_device(&pdev->dev); if (IS_ERR(rtc->rtcdev)) return PTR_ERR(rtc); @@ -185,7 +282,7 @@ static int rzn1_rtc_probe(struct platform_device *pdev) rtc->rtcdev->range_min = RTC_TIMESTAMP_BEGIN_2000; rtc->rtcdev->range_max = RTC_TIMESTAMP_END_2099; rtc->rtcdev->ops = &rzn1_rtc_ops; - clear_bit(RTC_FEATURE_ALARM, rtc->rtcdev->features); + set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->rtcdev->features); clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->rtcdev->features); devm_pm_runtime_enable(&pdev->dev); @@ -203,6 +300,13 @@ static int rzn1_rtc_probe(struct platform_device *pdev) /* Disable all interrupts */ writel(0, rtc->base + RZN1_RTC_CTL1); + ret = devm_request_irq(&pdev->dev, alarm_irq, rzn1_rtc_alarm_irq, 0, + dev_name(&pdev->dev), rtc); + if (ret) { + dev_err(&pdev->dev, "RTC timer interrupt not available\n"); + goto dis_runtime_pm; + } + ret = devm_rtc_register_device(rtc->rtcdev); if (ret) goto dis_runtime_pm; From patchwork Fri May 13 11:03:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12848675 X-Patchwork-Delegate: geert@linux-m68k.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1FC9CC43219 for ; Fri, 13 May 2022 11:03:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379720AbiEMLDs (ORCPT ); Fri, 13 May 2022 07:03:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45316 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379701AbiEMLDq (ORCPT ); Fri, 13 May 2022 07:03:46 -0400 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [IPv6:2001:4b98:dc4:8::227]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 34BAC2A2F42; Fri, 13 May 2022 04:03:43 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id 076E12000E; Fri, 13 May 2022 11:03:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1652439822; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cg7Lu7ZMGG3YSb9uhqDTPpQD4l1ydcR7jEcl/8VvVF0=; b=Gj4h0fT6HnnYiXYWrIU+f3BuhkQFWuNOyYg1xRoNouDpoFRfZO8TlqRiRvhFwXJovNdvZm oJ+I0k5AcW2ECXjSZiKdEp8C4eU90GRuL27x2Gd1zrYXYKaAn2eoldckExO0k28tf+OdPv aB7KrjG9JuRGwII5EyZufz71trrSoGOSejgZDvMydqA8ifgkmkgvPCRBF5JXpQiQrBYgFO EIKZQ6yiwKgiTEYOXW3ei9VBFbi0EjfbhOJGrLRiwoBjLYumE+JF93mbubdAzs1jCc/udF +pgQuM4pKyZ+1FpJ19KCJrL2wceok1ceJI7OQFRpBjdgVv3NflxSYXlr+p2Eeg== From: Miquel Raynal To: Alessandro Zummo , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Geert Uytterhoeven , Magnus Damm Cc: Miquel Raynal , linux-rtc@vger.kernel.org, linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, Gareth Williams , Milan Stevanovic , Jimmy Lalande , Pascal Eberhard , Thomas Petazzoni , Herve Codina , Clement Leger Subject: [PATCH v6 4/5] rtc: rzn1: Add oscillator offset support Date: Fri, 13 May 2022 13:03:26 +0200 Message-Id: <20220513110327.261652-5-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220513110327.261652-1-miquel.raynal@bootlin.com> References: <20220513110327.261652-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org The RZN1 RTC can compensate the imprecision of the oscillator up to approximately 190ppm. Seconds can last slightly shorter or longer depending on the configuration. Below ~65ppm of correction, we can change the time spent in a second every minute, which is the most accurate compensation that the RTC can offer. Above, the compensation will be active every 20s. Signed-off-by: Miquel Raynal --- drivers/rtc/rtc-rzn1.c | 73 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) diff --git a/drivers/rtc/rtc-rzn1.c b/drivers/rtc/rtc-rzn1.c index 7ee190daa651..f340793d9fc7 100644 --- a/drivers/rtc/rtc-rzn1.c +++ b/drivers/rtc/rtc-rzn1.c @@ -247,12 +247,85 @@ static int rzn1_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) return 0; } +static int rzn1_rtc_read_offset(struct device *dev, long *offset) +{ + struct rzn1_rtc *rtc = dev_get_drvdata(dev); + unsigned int ppb_per_step; + bool subtract; + u32 val; + + val = readl(rtc->base + RZN1_RTC_SUBU); + ppb_per_step = val & RZN1_RTC_SUBU_DEV ? 1017 : 3051; + subtract = val & RZN1_RTC_SUBU_DECR; + val &= 0x3F; + + if (!val) + *offset = 0; + else if (subtract) + *offset = -(((~val) & 0x3F) + 1) * ppb_per_step; + else + *offset = (val - 1) * ppb_per_step; + + return 0; +} + +static int rzn1_rtc_set_offset(struct device *dev, long offset) +{ + struct rzn1_rtc *rtc = dev_get_drvdata(dev); + unsigned int steps; + int stepsh, stepsl; + u32 val; + int ret; + + /* + * Check which resolution mode (every 20 or 60s) can be used. + * Between 2 and 124 clock pulses can be added or substracted. + * + * In 20s mode, the minimum resolution is 2 / (32768 * 20) which is + * close to 3051 ppb. In 60s mode, the resolution is closer to 1017. + */ + stepsh = DIV_ROUND_CLOSEST(offset, 1017); + stepsl = DIV_ROUND_CLOSEST(offset, 3051); + + if (stepsh >= -0x3E && stepsh <= 0x3E) { + /* 1017 ppb per step */ + steps = stepsh; + val |= RZN1_RTC_SUBU_DEV; + } else if (stepsl >= -0x3E && stepsl <= 0x3E) { + /* 3051 ppb per step */ + steps = stepsl; + } else { + return -ERANGE; + } + + if (!steps) + return 0; + + if (steps > 0) { + val |= steps + 1; + } else { + val |= RZN1_RTC_SUBU_DECR; + val |= (~(-steps - 1)) & 0x3F; + } + + ret = readl_poll_timeout(rtc->base + RZN1_RTC_CTL2, val, + !(val & RZN1_RTC_CTL2_WUST), 100, 2000000); + if (ret) + return ret; + + writel(val, rtc->base + RZN1_RTC_SUBU); + + return 0; +} + static const struct rtc_class_ops rzn1_rtc_ops = { .read_time = rzn1_rtc_read_time, .set_time = rzn1_rtc_set_time, .read_alarm = rzn1_rtc_read_alarm, .set_alarm = rzn1_rtc_set_alarm, .alarm_irq_enable = rzn1_rtc_alarm_irq_enable, + .read_offset = rzn1_rtc_read_offset, + .set_offset = rzn1_rtc_set_offset, }; static int rzn1_rtc_probe(struct platform_device *pdev) From patchwork Fri May 13 11:03:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12848676 X-Patchwork-Delegate: geert@linux-m68k.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DFBCDC4167E for ; Fri, 13 May 2022 11:03:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379689AbiEMLDs (ORCPT ); Fri, 13 May 2022 07:03:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45316 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379704AbiEMLDr (ORCPT ); Fri, 13 May 2022 07:03:47 -0400 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DB7742A28C1; Fri, 13 May 2022 04:03:45 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id A87F220004; Fri, 13 May 2022 11:03:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1652439824; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=AeURFA21azT2WZg6+haUTuGeT1PTBOnmz+vdgDPsEgY=; b=NwvaOyoRICAB1NqY0YApNBA2uzkqhvSv6vhv1maHsDwwdh2zrDwSBXSrEL+sryIzEh87+Q RGZzjPQWjPC4+Gglya8wlp+YeM1gae3ViKp/hqIlofX9e3vpCS1FOX5d4Jzd6R3jaTcM8N q0AwS4GiAs0pvciUVadQErCXVoaVgqBJnhS2x3oz513gvxuLCNgdB5S+RquukfWxdJ8WLE TRh9ufKmyYLVM1QbEH4BEvMs1fuDUN+EF8Uiq1v8T5h+HPjC6Wf/PHCLPWpEXYksqEhJRd TQBIVJxczltYvKh7eqwvX8e3y23KzTtsheyANVEgm6yjiVakzZ27T/Cw4qVdxg== From: Miquel Raynal To: Alessandro Zummo , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Geert Uytterhoeven , Magnus Damm Cc: Miquel Raynal , linux-rtc@vger.kernel.org, linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, Gareth Williams , Milan Stevanovic , Jimmy Lalande , Pascal Eberhard , Thomas Petazzoni , Herve Codina , Clement Leger Subject: [PATCH v6 5/5] MAINTAINERS: Add myself as maintainer of the RZN1 RTC driver Date: Fri, 13 May 2022 13:03:27 +0200 Message-Id: <20220513110327.261652-6-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220513110327.261652-1-miquel.raynal@bootlin.com> References: <20220513110327.261652-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org After contributing it, I'll volunteer to maintain it. Signed-off-by: Miquel Raynal Acked-by: Geert Uytterhoeven --- MAINTAINERS | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 9cf74e4eacce..cc4a3cca022e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16847,6 +16847,14 @@ S: Supported F: Documentation/devicetree/bindings/iio/adc/renesas,rzg2l-adc.yaml F: drivers/iio/adc/rzg2l_adc.c +RENESAS RZ/N1 RTC CONTROLLER DRIVER +M: Miquel Raynal +L: linux-rtc@vger.kernel.org +L: linux-renesas-soc@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml +F: drivers/rtc/rtc-rzn1.c + RENESAS R-CAR GEN3 & RZ/N1 NAND CONTROLLER DRIVER M: Miquel Raynal L: linux-mtd@lists.infradead.org