From patchwork Tue Sep 10 10:14:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xianwei Zhao via B4 Relay X-Patchwork-Id: 13798298 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 32154EDE99A for ; Tue, 10 Sep 2024 10:14:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Reply-To:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References: Message-Id:MIME-Version:Subject:Date:From:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=bC39E54vF3UkvPJuALB2miNadbM3ed1XZ/9Po2RFeWo=; b=2K1CJFxLia61gA MBGWNJJkSF0fJjsC/K0DaCiOuDpXjzWIuCLJrZsUwx5UJzQEoYa2fXJHl8DM58NOQ5Hkd7spCTdwe zJWd1Wb41yHkX9Y8G0Nic4Y2Q8/zcfd0BgPUOETADHlYf0mZU00ytLmqgNUakH5855qCYbHsCrbbv uSx8yb3gkTCunUb3N/YA6TeEN1lWRWkVV44aNwvwCxaTSNmHrrUFTo9+0+AuG2+0rRaYCj4UABRQD xL2f/DrqGaEiIfqgiGv0aLLMXoFZXAuLlKX7bgHtvWrb4An4WhPe89j1g1fyX4tFeuEeTq056qtJR SPUkpjt4Gx3q2g3LPO0Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1snxtJ-00000005CNG-1CrW; Tue, 10 Sep 2024 10:14:33 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1snxt7-00000005CIS-3emq for linux-amlogic@lists.infradead.org; Tue, 10 Sep 2024 10:14:25 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 3CA2BA44555; Tue, 10 Sep 2024 10:14:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id 6ADDFC4CEC3; Tue, 10 Sep 2024 10:14:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725963260; bh=KDsv3s5S2knS4s9lv8drKPwrJUJ8cTMP0GELKtXUN7U=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=RPxe5kjFUoTcryIcIed+HVxDZ0RPRA4FQkW5camA4tc+fFnXN+em2/qrCWw8y2T3L NlF5d9//sxB/jiDrcf/P0UEBMiR7behXr3r+5k0wP3ig9y5ECYDh+F+Xyn/TtTm3p/ 5Rx5frmI/vO7E+DOgtQokNsn1LG3sEdOHumBpXKYSt/hars/cnr8Kj1bSGsaWhPj+X TNKvyBnCxN02UlQIel+vSGD9E5Xw4/ti3ElpJJyRVkmY/JDyEDNr2bHi8Qn0cjzNtv udK06wDqslxJ6U7rmMFr7xvARBeJU67mqpn+/26xIT+FYZOHxYkzAJUD4XIyRSbcd+ 1VnR2i3G716uw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5ADAAECE58D; Tue, 10 Sep 2024 10:14:20 +0000 (UTC) From: Xianwei Zhao via B4 Relay Date: Tue, 10 Sep 2024 18:14:18 +0800 Subject: [PATCH v3 1/3] dt-bindings: rtc: Add Amlogic A4 and A5 RTC MIME-Version: 1.0 Message-Id: <20240910-rtc-v3-1-1fa077a69a20@amlogic.com> References: <20240910-rtc-v3-0-1fa077a69a20@amlogic.com> In-Reply-To: <20240910-rtc-v3-0-1fa077a69a20@amlogic.com> To: Yiting Deng , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-amlogic@lists.infradead.org, linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Xianwei Zhao X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; t=1725963258; l=2094; i=xianwei.zhao@amlogic.com; s=20231208; h=from:subject:message-id; bh=RJlEl+9x/wxXWC6SJOp6Ssaq+XIiQ49flcxO3prFEIo=; b=lqlH6lI6Mbaz8YpxYz0TvJYx6HNMDygTItWswCe2gH4ekIPI9APVWGUrxlgDcFj2lr+EWy8WV ZTtRGI+e0jcD6hektMsVUGKIXJRU9RwY0rVIX3/vSUQEUVyHcpFOqJ5 X-Developer-Key: i=xianwei.zhao@amlogic.com; a=ed25519; pk=o4fDH8ZXL6xQg5h17eNzRljf6pwZHWWjqcOSsj3dW24= X-Endpoint-Received: by B4 Relay for xianwei.zhao@amlogic.com/20231208 with auth_id=107 X-Original-From: Xianwei Zhao X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240910_031422_109242_645383AC X-CRM114-Status: GOOD ( 11.68 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: xianwei.zhao@amlogic.com Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org From: Yiting Deng Add documentation describing the Amlogic A4(A113L2) and A5(A113X2) RTC. Signed-off-by: Yiting Deng Signed-off-by: Xianwei Zhao Reviewed-by: Krzysztof Kozlowski --- .../devicetree/bindings/rtc/amlogic,a4-rtc.yaml | 63 ++++++++++++++++++++++ 1 file changed, 63 insertions(+) diff --git a/Documentation/devicetree/bindings/rtc/amlogic,a4-rtc.yaml b/Documentation/devicetree/bindings/rtc/amlogic,a4-rtc.yaml new file mode 100644 index 000000000000..eee994753a12 --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/amlogic,a4-rtc.yaml @@ -0,0 +1,63 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (C) 2024 Amlogic, Inc. All rights reserved +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/rtc/amlogic,a4-rtc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Amlogic A4 and A5 RTC + +maintainers: + - Yiting Deng + - Xianwei Zhao + +allOf: + - $ref: rtc.yaml# + +properties: + compatible: + enum: + - amlogic,a4-rtc + - amlogic,a5-rtc + + reg: + maxItems: 1 + + clocks: + items: + - description: RTC clock source, available 24M or 32K crystal + oscillator source. when using 24M, need to divide 24M into 32K. + - description: RTC module accesses the clock of the apb bus. + + clock-names: + items: + - const: osc + - const: sys + + interrupts: + maxItems: 1 + +required: + - compatible + - reg + - interrupts + - clocks + - clock-names + +additionalProperties: false + +examples: + - | + #include + apb { + #address-cells = <2>; + #size-cells = <2>; + + rtc@8e600 { + compatible = "amlogic,a4-rtc"; + reg = <0x0 0x8e600 0x0 0x38>; + interrupts = ; + clocks = <&xtal_32k>, <&clkc_periphs 1>; + clock-names = "osc", "sys"; + }; + }; From patchwork Tue Sep 10 10:14:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xianwei Zhao via B4 Relay X-Patchwork-Id: 13798300 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 58DAFEDE99B for ; Tue, 10 Sep 2024 10:14:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Reply-To:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References: Message-Id:MIME-Version:Subject:Date:From:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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Tue, 10 Sep 2024 10:14:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725963260; bh=Sr03DLwF+0CRjwS+JcY9FQ/jwAk9Erb+TmTfkjjxxuo=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=sTomFNvL4Y/RAMJOF48nbyYbkgbN0pWqWcPG6CnQ1cANwHuUsPG6+8DRAEpeUz9Xa ACVGvKiM7VH2sTPCLOkNcez2lgtvhKJ3uJ/LjajEj3R42mjST/TcHqwE8YTnCx9Suc cLQrZ/UL3bHpa94H1Z5TDNQGiuOtm60fIc5+EydfycxPqKqdIuPsqSSYpffs8h+EtI cZKdXxiIHVmtBqqRNUR3ARE/45RS9HMJyloIt7G3bXJVr2Rce5bZb3Pk1Fe7tTu5vQ iXHmcha8N+WOB/axPmpHfCLhYyFuS5pFJbUwqt9PpwC2Obo/3bMlyQutCQH40Pv2ag VhFhu8t5c3CoQ== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E86BEB64DE; Tue, 10 Sep 2024 10:14:20 +0000 (UTC) From: Xianwei Zhao via B4 Relay Date: Tue, 10 Sep 2024 18:14:19 +0800 Subject: [PATCH v3 2/3] rtc: support for the Amlogic on-chip RTC MIME-Version: 1.0 Message-Id: <20240910-rtc-v3-2-1fa077a69a20@amlogic.com> References: <20240910-rtc-v3-0-1fa077a69a20@amlogic.com> In-Reply-To: <20240910-rtc-v3-0-1fa077a69a20@amlogic.com> To: Yiting Deng , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-amlogic@lists.infradead.org, linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Xianwei Zhao X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; t=1725963258; l=15598; i=xianwei.zhao@amlogic.com; s=20231208; h=from:subject:message-id; bh=cNbOL9mU9+fA5KZFmGLhYAJ5+VuZHdScljqBEQYouWY=; b=WjiqRJFmSOeL0a8UmKyqvyDba2g7b0KAkSVSD1qIzHolbZhDvwcwJrjPnAy9TzoHVb1D/JqpE RrSmcj8a04FAaKbDH1ZfaElNQnL/zWaAgE/XFH/csDOHy565cL2zOmE X-Developer-Key: i=xianwei.zhao@amlogic.com; a=ed25519; pk=o4fDH8ZXL6xQg5h17eNzRljf6pwZHWWjqcOSsj3dW24= X-Endpoint-Received: by B4 Relay for xianwei.zhao@amlogic.com/20231208 with auth_id=107 X-Original-From: Xianwei Zhao X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240910_031422_256098_388650A5 X-CRM114-Status: GOOD ( 26.99 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: xianwei.zhao@amlogic.com Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org From: Yiting Deng This is the third amlogic driver. The RTC hardware of A4 SoC is different from the previous one. This RTC hardware includes a timing function and an alarm function. But the existing has only timing function, alarm function is using the system clock to implement a virtual alarm. Add the RTC driver to support it. Signed-off-by: Yiting Deng Signed-off-by: Xianwei Zhao --- drivers/rtc/Kconfig | 12 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-amlogic-a4.c | 473 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 486 insertions(+) diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 2a95b05982ad..1d49738a2796 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -2043,4 +2043,16 @@ config RTC_DRV_SSD202D This driver can also be built as a module, if so, the module will be called "rtc-ssd20xd". +config RTC_DRV_AMLOGIC_A4 + tristate "Amlogic RTC" + depends on ARCH_MESON || COMPILE_TEST + select REGMAP_MMIO + default y + help + If you say yes here you get support for the RTC block on the + Amlogic A113L2(A4) and A113X2(A5) SoCs. + + This driver can also be built as a module. If so, the module + will be called "rtc-amlogic-a4". + endif # RTC_CLASS diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 3004e372f25f..2122f469e633 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_RTC_DRV_ABB5ZES3) += rtc-ab-b5ze-s3.o obj-$(CONFIG_RTC_DRV_ABEOZ9) += rtc-ab-eoz9.o obj-$(CONFIG_RTC_DRV_ABX80X) += rtc-abx80x.o obj-$(CONFIG_RTC_DRV_AC100) += rtc-ac100.o +obj-$(CONFIG_RTC_DRV_AMLOGIC_A4) += rtc-amlogic-a4.o obj-$(CONFIG_RTC_DRV_ARMADA38X) += rtc-armada38x.o obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o obj-$(CONFIG_RTC_DRV_ASM9260) += rtc-asm9260.o diff --git a/drivers/rtc/rtc-amlogic-a4.c b/drivers/rtc/rtc-amlogic-a4.c new file mode 100644 index 000000000000..decd74df225c --- /dev/null +++ b/drivers/rtc/rtc-amlogic-a4.c @@ -0,0 +1,473 @@ +// SPDX-License-Identifier: (GPL-2.0-only OR MIT) +/* + * Copyright (C) 2024 Amlogic, Inc. All rights reserved + * Author: Yiting Deng + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* rtc oscillator rate */ +#define OSC_32K (32768) +#define OSC_24M (24000000) + +#define RTC_CTRL (0x0 << 2) /* Control RTC */ +#define RTC_ALRM0_EN BIT(0) +#define RTC_OSC_SEL BIT(8) +#define RTC_ENABLE BIT(12) + +#define RTC_COUNTER_REG (0x1 << 2) /* Program RTC counter initial value */ + +#define RTC_ALARM0_REG (0x2 << 2) /* Program RTC alarm0 value */ + +#define RTC_SEC_ADJUST_REG (0x6 << 2) /* Control second-based timing adjustment */ +#define RTC_MATCH_COUNTER GENMASK(18, 0) +#define RTC_SEC_ADJUST_CTRL GENMASK(20, 19) +#define RTC_ADJ_VALID BIT(23) + +#define RTC_INT_MASK (0x8 << 2) /* RTC interrupt mask */ +#define RTC_ALRM0_IRQ_MSK BIT(0) + +#define RTC_INT_CLR (0x9 << 2) /* Clear RTC interrupt */ +#define RTC_ALRM0_IRQ_CLR BIT(0) + +#define RTC_OSCIN_CTRL0 (0xa << 2) /* Control RTC clk from 24M */ +#define RTC_OSCIN_CTRL1 (0xb << 2) /* Control RTC clk from 24M */ +#define RTC_OSCIN_IN_EN BIT(31) +#define RTC_OSCIN_OUT_CFG GENMASK(29, 28) +#define RTC_OSCIN_OUT_N0M0 GENMASK(11, 0) +#define RTC_OSCIN_OUT_N1M1 GENMASK(23, 12) + +#define RTC_INT_STATUS (0xc << 2) /* RTC interrupt status */ +#define RTC_ALRM0_IRQ_STATUS BIT(0) + +#define RTC_REAL_TIME (0xd << 2) /* RTC time value */ + +#define RTC_OSCIN_OUT_32K_N0 0x2dc +#define RTC_OSCIN_OUT_32K_N1 0x2db +#define RTC_OSCIN_OUT_32K_M0 0x1 +#define RTC_OSCIN_OUT_32K_M1 0x2 + +#define RTC_SWALLOW_SECOND 0x2 +#define RTC_INSERT_SECOND 0x3 + +struct aml_rtc_config { + bool gray_stored; +}; + +struct aml_rtc_data { + struct regmap *map; + struct rtc_device *rtc_dev; + int irq; + struct clk *rtc_clk; + struct clk *sys_clk; + int rtc_enabled; + const struct aml_rtc_config *config; +}; + +static const struct regmap_config aml_rtc_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = RTC_REAL_TIME, +}; + +static inline u32 gray_to_binary(u32 gray) +{ + u32 bcd = gray; + int size = sizeof(bcd) * 8; + int i; + + for (i = 0; (1 << i) < size; i++) + bcd ^= bcd >> (1 << i); + + return bcd; +} + +static inline u32 binary_to_gray(u32 bcd) +{ + return bcd ^ (bcd >> 1); +} + +static int aml_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct aml_rtc_data *rtc = dev_get_drvdata(dev); + u32 time_sec; + + /* if RTC disabled, read time failed */ + if (!rtc->rtc_enabled) { + dev_err(dev, "RTC disabled, read time failed\n"); + return -EINVAL; + } + + regmap_read(rtc->map, RTC_REAL_TIME, &time_sec); + if (rtc->config->gray_stored) + time_sec = gray_to_binary(time_sec); + rtc_time64_to_tm(time_sec, tm); + dev_dbg(dev, "%s: read time = %us\n", __func__, time_sec); + + return 0; +} + +static int aml_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct aml_rtc_data *rtc = dev_get_drvdata(dev); + u32 time_sec; + + /* if RTC disabled, first enable it */ + if (!rtc->rtc_enabled) { + regmap_write_bits(rtc->map, RTC_CTRL, RTC_ENABLE, RTC_ENABLE); + usleep_range(100, 200); + rtc->rtc_enabled = regmap_test_bits(rtc->map, RTC_CTRL, RTC_ENABLE); + } + + time_sec = rtc_tm_to_time64(tm); + if (rtc->config->gray_stored) + time_sec = binary_to_gray(time_sec); + regmap_write(rtc->map, RTC_COUNTER_REG, time_sec); + dev_dbg(dev, "%s: set time = %us\n", __func__, time_sec); + + return 0; +} + +static int aml_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct aml_rtc_data *rtc = dev_get_drvdata(dev); + time64_t alarm_sec = 0; + + /* if RTC disabled, set alarm failed */ + if (!rtc->rtc_enabled) { + dev_err(dev, "RTC disabled, set alarm failed\n"); + return -EINVAL; + } + + regmap_update_bits(rtc->map, RTC_CTRL, + RTC_ALRM0_EN, RTC_ALRM0_EN); + regmap_update_bits(rtc->map, RTC_INT_MASK, + RTC_ALRM0_IRQ_MSK, 0); + + alarm_sec = rtc_tm_to_time64(&alarm->time); + if (rtc->config->gray_stored) + alarm_sec = binary_to_gray(alarm_sec); + regmap_write(rtc->map, RTC_ALARM0_REG, alarm_sec); + + dev_dbg(dev, "%s: alarm->enabled=%d alarm_set=%llds\n", __func__, + alarm->enabled, alarm_sec); + + return 0; +} + +static int aml_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct aml_rtc_data *rtc = dev_get_drvdata(dev); + u32 alarm_sec; + int alarm_enable, alarm_mask; + + /* if RTC disabled, read alarm failed */ + if (!rtc->rtc_enabled) { + dev_err(dev, "RTC disabled, read alarm failed\n"); + return -EINVAL; + } + + regmap_read(rtc->map, RTC_ALARM0_REG, &alarm_sec); + if (rtc->config->gray_stored) + alarm_sec = gray_to_binary(alarm_sec); + rtc_time64_to_tm(alarm_sec, &alarm->time); + + alarm_enable = regmap_test_bits(rtc->map, RTC_CTRL, RTC_ALRM0_EN); + alarm_mask = regmap_test_bits(rtc->map, RTC_INT_MASK, RTC_ALRM0_IRQ_MSK); + alarm->enabled = (alarm_enable && !alarm_mask) ? 1 : 0; + dev_dbg(dev, "%s: alarm->enabled=%d alarm=%us\n", __func__, + alarm->enabled, alarm_sec); + + return 0; +} + +static int aml_rtc_read_offset(struct device *dev, long *offset) +{ + struct aml_rtc_data *rtc = dev_get_drvdata(dev); + u32 reg_val; + long val; + int sign, match_counter, enable; + + /* if RTC disabled, read offset failed */ + if (!rtc->rtc_enabled) { + dev_err(dev, "RTC disabled, read offset failed\n"); + return -EINVAL; + } + + regmap_read(rtc->map, RTC_SEC_ADJUST_REG, ®_val); + enable = FIELD_GET(RTC_ADJ_VALID, reg_val); + if (!enable) { + val = 0; + } else { + sign = FIELD_GET(RTC_SEC_ADJUST_CTRL, reg_val); + match_counter = FIELD_GET(RTC_MATCH_COUNTER, reg_val); + val = 1000000000 / (match_counter + 1); + if (sign == RTC_SWALLOW_SECOND) + val = -val; + } + *offset = val; + + return 0; +} + +static int aml_rtc_set_offset(struct device *dev, long offset) +{ + struct aml_rtc_data *rtc = dev_get_drvdata(dev); + int sign = 0, match_counter = 0, enable = 0; + u32 reg_val; + + /* if RTC disabled, set offset failed */ + if (!rtc->rtc_enabled) { + dev_err(dev, "RTC disabled, set offset failed\n"); + return -EINVAL; + } + + if (offset) { + enable = 1; + sign = offset < 0 ? RTC_SWALLOW_SECOND : RTC_INSERT_SECOND; + match_counter = 1000000000 / abs(offset) - 1; + if (match_counter < 0 || match_counter > RTC_MATCH_COUNTER) + return -EINVAL; + } + + reg_val = FIELD_PREP(RTC_ADJ_VALID, enable) | + FIELD_PREP(RTC_SEC_ADJUST_CTRL, sign) | + FIELD_PREP(RTC_MATCH_COUNTER, match_counter); + regmap_write(rtc->map, RTC_SEC_ADJUST_REG, reg_val); + + return 0; +} + +static int aml_rtc_alarm_enable(struct device *dev, unsigned int enabled) +{ + struct aml_rtc_data *rtc = dev_get_drvdata(dev); + + if (enabled) { + regmap_update_bits(rtc->map, RTC_CTRL, + RTC_ALRM0_EN, RTC_ALRM0_EN); + regmap_update_bits(rtc->map, RTC_INT_MASK, + RTC_ALRM0_IRQ_MSK, 0); + } else { + regmap_update_bits(rtc->map, RTC_INT_MASK, + RTC_ALRM0_IRQ_MSK, RTC_ALRM0_IRQ_MSK); + regmap_update_bits(rtc->map, RTC_CTRL, + RTC_ALRM0_EN, 0); + } + + return 0; +} + +static const struct rtc_class_ops aml_rtc_ops = { + .read_time = aml_rtc_read_time, + .set_time = aml_rtc_set_time, + .read_alarm = aml_rtc_read_alarm, + .set_alarm = aml_rtc_set_alarm, + .alarm_irq_enable = aml_rtc_alarm_enable, + .read_offset = aml_rtc_read_offset, + .set_offset = aml_rtc_set_offset, +}; + +static irqreturn_t aml_rtc_handler(int irq, void *data) +{ + struct aml_rtc_data *rtc = (struct aml_rtc_data *)data; + + regmap_write(rtc->map, RTC_ALARM0_REG, 0); + regmap_write(rtc->map, RTC_INT_CLR, RTC_ALRM0_IRQ_STATUS); + + rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF); + + return IRQ_HANDLED; +} + +static void aml_rtc_init(struct aml_rtc_data *rtc) +{ + u32 reg_val = 0; + + rtc->rtc_enabled = regmap_test_bits(rtc->map, RTC_CTRL, RTC_ENABLE); + if (!rtc->rtc_enabled) { + if (clk_get_rate(rtc->rtc_clk) == OSC_24M) { + /* select 24M oscillator */ + regmap_write_bits(rtc->map, RTC_CTRL, RTC_OSC_SEL, RTC_OSC_SEL); + + /* + * Set RTC oscillator to freq_out to freq_in/((N0*M0+N1*M1)/(M0+M1)) + * Enable clock_in gate of oscillator 24MHz + * Set N0 to 733, N1 to 732 + */ + reg_val = FIELD_PREP(RTC_OSCIN_IN_EN, 1) + | FIELD_PREP(RTC_OSCIN_OUT_CFG, 1) + | FIELD_PREP(RTC_OSCIN_OUT_N0M0, RTC_OSCIN_OUT_32K_N0) + | FIELD_PREP(RTC_OSCIN_OUT_N1M1, RTC_OSCIN_OUT_32K_N1); + regmap_write_bits(rtc->map, RTC_OSCIN_CTRL0, RTC_OSCIN_IN_EN + | RTC_OSCIN_OUT_CFG | RTC_OSCIN_OUT_N0M0 + | RTC_OSCIN_OUT_N1M1, reg_val); + + /* Set M0 to 2, M1 to 3, so freq_out = 32768 Hz*/ + reg_val = FIELD_PREP(RTC_OSCIN_OUT_N0M0, RTC_OSCIN_OUT_32K_M0) + | FIELD_PREP(RTC_OSCIN_OUT_N1M1, RTC_OSCIN_OUT_32K_M1); + regmap_write_bits(rtc->map, RTC_OSCIN_CTRL1, RTC_OSCIN_OUT_N0M0 + | RTC_OSCIN_OUT_N1M1, reg_val); + } else { + /* select 32K oscillator */ + regmap_write_bits(rtc->map, RTC_CTRL, RTC_OSC_SEL, 0); + } + } + regmap_write_bits(rtc->map, RTC_INT_MASK, + RTC_ALRM0_IRQ_MSK, RTC_ALRM0_IRQ_MSK); + regmap_write_bits(rtc->map, RTC_CTRL, RTC_ALRM0_EN, 0); +} + +static int aml_rtc_probe(struct platform_device *pdev) +{ + struct aml_rtc_data *rtc; + void __iomem *base; + int ret = 0; + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + rtc->config = of_device_get_match_data(&pdev->dev); + if (!rtc->config) + return -ENODEV; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return dev_err_probe(&pdev->dev, PTR_ERR(base), "resource ioremap failed\n"); + + rtc->map = devm_regmap_init_mmio(&pdev->dev, base, &aml_rtc_regmap_config); + if (IS_ERR(rtc->map)) + return dev_err_probe(&pdev->dev, PTR_ERR(rtc->map), "regmap init failed\n"); + + rtc->irq = platform_get_irq(pdev, 0); + if (rtc->irq < 0) + return rtc->irq; + + rtc->rtc_clk = devm_clk_get(&pdev->dev, "osc"); + if (IS_ERR(rtc->rtc_clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(rtc->rtc_clk), + "failed to find rtc clock\n"); + if (clk_get_rate(rtc->rtc_clk) != OSC_32K && clk_get_rate(rtc->rtc_clk) != OSC_24M) + return dev_err_probe(&pdev->dev, -EINVAL, "Invalid clock configuration\n"); + + rtc->sys_clk = devm_clk_get(&pdev->dev, "sys"); + if (IS_ERR(rtc->sys_clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(rtc->sys_clk), + "failed to get rtc sys clk\n"); + ret = clk_prepare_enable(rtc->sys_clk); + if (ret) + return dev_err_probe(&pdev->dev, ret, "Failed to enable clk!\n"); + + aml_rtc_init(rtc); + + device_init_wakeup(&pdev->dev, 1); + platform_set_drvdata(pdev, rtc); + + rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(rtc->rtc_dev)) { + ret = PTR_ERR(rtc->rtc_dev); + goto err_clk; + } + + ret = devm_request_irq(&pdev->dev, rtc->irq, aml_rtc_handler, + IRQF_ONESHOT, "aml-rtc alarm", rtc); + if (ret) { + dev_err_probe(&pdev->dev, ret, "IRQ%d request failed, ret = %d\n", + rtc->irq, ret); + goto err_clk; + } + + rtc->rtc_dev->ops = &aml_rtc_ops; + rtc->rtc_dev->range_min = 0; + rtc->rtc_dev->range_max = U32_MAX; + + ret = devm_rtc_register_device(rtc->rtc_dev); + if (ret) { + dev_err_probe(&pdev->dev, ret, "Failed to register RTC device: %d\n", ret); + goto err_clk; + } + + return 0; +err_clk: + clk_disable_unprepare(rtc->sys_clk); + + return ret; +} + +static int aml_rtc_suspend(struct device *dev) +{ + struct aml_rtc_data *rtc = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + enable_irq_wake(rtc->irq); + + return 0; +} + +static int aml_rtc_resume(struct device *dev) +{ + struct aml_rtc_data *rtc = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + disable_irq_wake(rtc->irq); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(aml_rtc_pm_ops, + aml_rtc_suspend, aml_rtc_resume); + +static int aml_rtc_remove(struct platform_device *pdev) +{ + struct aml_rtc_data *rtc = dev_get_drvdata(&pdev->dev); + + /* disable RTC */ + regmap_write_bits(rtc->map, RTC_CTRL, RTC_ENABLE, 0); + clk_disable_unprepare(rtc->sys_clk); + device_init_wakeup(&pdev->dev, 0); + + return 0; +} + +static const struct aml_rtc_config a5_rtc_config = { +}; + +static const struct aml_rtc_config a4_rtc_config = { + .gray_stored = true, +}; + +static const struct of_device_id aml_rtc_device_id[] = { + { + .compatible = "amlogic,a4-rtc", + .data = &a4_rtc_config, + }, + { + .compatible = "amlogic,a5-rtc", + .data = &a5_rtc_config, + }, +}; +MODULE_DEVICE_TABLE(of, aml_rtc_device_id); + +static struct platform_driver aml_rtc_driver = { + .probe = aml_rtc_probe, + .remove = aml_rtc_remove, + .driver = { + .name = "aml-rtc", + .pm = &aml_rtc_pm_ops, + .of_match_table = aml_rtc_device_id, + }, +}; + +module_platform_driver(aml_rtc_driver); +MODULE_DESCRIPTION("Amlogic RTC driver"); +MODULE_AUTHOR("Yiting Deng "); 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X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: xianwei.zhao@amlogic.com Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org From: Yiting Deng Add Amlogic RTC entry to MAINTAINERS to clarify the maintainers. Signed-off-by: Yiting Deng Signed-off-by: Xianwei Zhao --- MAINTAINERS | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 42decde38320..f595715eb3e3 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1163,6 +1163,14 @@ F: Documentation/devicetree/bindings/perf/amlogic,g12-ddr-pmu.yaml F: drivers/perf/amlogic/ F: include/soc/amlogic/ +AMLOGIC RTC DRIVER +M: Yiting Deng +M: Xianwei Zhao +L: linux-amlogic@lists.infradead.org +S: Maintained +F: Documentation/devicetree/bindings/rtc/amlogic,a4-rtc.yaml +F: drivers/rtc/rtc-amlogic-a4.c + AMPHENOL CHIPCAP 2 HUMIDITY-TEMPERATURE IIO DRIVER M: Javier Carrasco L: linux-hwmon@vger.kernel.org