From patchwork Wed Nov 2 08:35:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Billy Tsai X-Patchwork-Id: 14079 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp3487964wru; Wed, 2 Nov 2022 01:36:50 -0700 (PDT) X-Google-Smtp-Source: AMsMyM7IfPS2maOrGXbq815ji9Z2sh1wOJo0VV20pzZ5T6sTrJOTFH5H2PoJM1fD6eLcCB/zO4M3 X-Received: by 2002:a17:907:e93:b0:7ad:923a:5908 with SMTP id ho19-20020a1709070e9300b007ad923a5908mr22967229ejc.396.1667378210708; Wed, 02 Nov 2022 01:36:50 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1667378210; cv=none; d=google.com; s=arc-20160816; b=0FhVWsVOKt0AMXUQMDMiquIcYTHWnIFv5eXZMXKNyggTsCHeN50p+PscCCeXEWpNYx Nb3IVm6XplsSX8jUL78COU6eI5ipCvJMF/4KuLHAb4YeGT8rVvHjKLTcuWDT5971apVK aSA4s82In9FHlxxE20Zr8mIAgdziO7T4sFOxQkQhExPrUGA4sEN93us3z1e2qwV3pjdA aqO6fbL9YE3p9U0+ZiIPUC6yTA6DXzs8rEmtJHftKvlhTL7vXcrP4/NLUeyxAe4JHKFC NOkkjmJKfonVQYUN19NQ61MlxgsFlr4F7se3SToyK/Hii3Qn+NG5RxO/gkPJ3iUXGrip flTw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:to:from; bh=TyidwOR9y1rNP6sHg3igZs4W7GSd7li7WQt1uvJ6TyA=; b=h1ZgbnJTBpJ9bkUt+maTbUmCLx2UwgyEmNRO+gWSBporQNOgRGyR7NfS1jqBalwJJW +onsqwkFgMOSnLCrsHlKkjonhLdzynIJ5kqbQypbAx5GmUPHqPGQL30RSid4XIqyKpwX VfdrS96aCXlvbM63OGrn46IwaNa1jMu7bOctP/C7tzTUBgy1FxanyP5xEZUaMwtZlFhH p0oPtQATidODvn1utmo++SKPo92TIuCkoYUAN7CjgPsKYxJvrQmVvtNmnq0IwKCPCnj2 BkojMPD7ouF/CsI0128Rp3iFfpmBXTbPvPy0JVhKyf9qOPHsJT5y1e/Zl2szxmGIT2WH po3w== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id gt13-20020a1709072d8d00b0078c37681f89si17921720ejc.650.2022.11.02.01.36.27; Wed, 02 Nov 2022 01:36:50 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230308AbiKBIek (ORCPT + 99 others); Wed, 2 Nov 2022 04:34:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41126 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229887AbiKBIee (ORCPT ); Wed, 2 Nov 2022 04:34:34 -0400 Received: from twspam01.aspeedtech.com (twspam01.aspeedtech.com [211.20.114.71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9A1A12AD0 for ; Wed, 2 Nov 2022 01:34:33 -0700 (PDT) Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 2A28BAHu072663; Wed, 2 Nov 2022 16:11:10 +0800 (GMT-8) (envelope-from billy_tsai@aspeedtech.com) Received: from BillyTsai-pc.aspeed.com (192.168.2.149) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 2 Nov 2022 16:34:23 +0800 From: Billy Tsai To: , , , , , , , , , , , , , , , , , Subject: [v3 1/3] dt-bindings: Add bindings for aspeed pwm-tach. Date: Wed, 2 Nov 2022 16:35:59 +0800 Message-ID: <20221102083601.10456-2-billy_tsai@aspeedtech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221102083601.10456-1-billy_tsai@aspeedtech.com> References: <20221102083601.10456-1-billy_tsai@aspeedtech.com> MIME-Version: 1.0 X-Originating-IP: [192.168.2.149] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 2A28BAHu072663 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1748372774647829419?= X-GMAIL-MSGID: =?utf-8?q?1748372774647829419?= This patch adds device binding for aspeed pwm-tach device which is a multi-function device include pwm and tach function and pwm/tach device bindings which should be the child-node of pwm-tach device. Signed-off-by: Billy Tsai --- .../bindings/hwmon/aspeed,ast2600-tach.yaml | 48 ++++++++++++ .../bindings/mfd/aspeed,ast2600-pwm-tach.yaml | 76 +++++++++++++++++++ .../bindings/pwm/aspeed,ast2600-pwm.yaml | 64 ++++++++++++++++ 3 files changed, 188 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/aspeed,ast2600-tach.yaml create mode 100644 Documentation/devicetree/bindings/mfd/aspeed,ast2600-pwm-tach.yaml create mode 100644 Documentation/devicetree/bindings/pwm/aspeed,ast2600-pwm.yaml diff --git a/Documentation/devicetree/bindings/hwmon/aspeed,ast2600-tach.yaml b/Documentation/devicetree/bindings/hwmon/aspeed,ast2600-tach.yaml new file mode 100644 index 000000000000..838200fae30e --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/aspeed,ast2600-tach.yaml @@ -0,0 +1,48 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (C) 2021 Aspeed, Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/hwmon/aspeed,ast2600-tach.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Aspeed Ast2600 Tach controller + +maintainers: + - Billy Tsai + +description: | + The Aspeed Tach controller can support upto 16 fan input. + This module is part of the ast2600-pwm-tach multi-function device. For more + details see ../mfd/aspeed,ast2600-pwm-tach.yaml. + +properties: + compatible: + enum: + - aspeed,ast2600-tach + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + pinctrl-0: true + + pinctrl-names: + const: default + +required: + - compatible + - "#address-cells" + - "#size-cells" + +additionalProperties: + type: object + properties: + reg: + description: + The tach channel used for this node. + maxItems: 1 + + required: + - reg diff --git a/Documentation/devicetree/bindings/mfd/aspeed,ast2600-pwm-tach.yaml b/Documentation/devicetree/bindings/mfd/aspeed,ast2600-pwm-tach.yaml new file mode 100644 index 000000000000..1eaf6fab2752 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/aspeed,ast2600-pwm-tach.yaml @@ -0,0 +1,76 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (C) 2021 Aspeed, Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mfd/aspeed,ast2600-pwm-tach.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: PWM Tach controller Device Tree Bindings + +description: | + The PWM Tach controller is represented as a multi-function device which + includes: + PWM + Tach + +maintainers: + - Billy Tsai + +properties: + compatible: + items: + - enum: + - aspeed,ast2600-pwm-tach + - const: syscon + - const: simple-mfd + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + resets: + maxItems: 1 + +required: + - compatible + - reg + - clocks + - resets + +patternProperties: + "^pwm(@[0-9a-f]+)?$": + $ref: ../pwm/aspeed,ast2600-pwm.yaml + + "^tach(@[0-9a-f]+)?$": + $ref: ../hwmon/aspeed,ast2600-tach.yaml + +additionalProperties: false + +examples: + - | + #include + pwm_tach: pwm_tach@1e610000 { + compatible = "aspeed,ast2600-pwm-tach", "syscon", "simple-mfd"; + reg = <0x1e610000 0x100>; + clocks = <&syscon ASPEED_CLK_AHB>; + resets = <&syscon ASPEED_RESET_PWM>; + + pwm: pwm { + compatible = "aspeed,ast2600-pwm"; + #address-cells = <1>; + #size-cells = <0>; + #pwm-cells = <3>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_pwm0_default>; + }; + + tach: tach { + compatible = "aspeed,ast2600-tach"; + #address-cells = <1>; + #size-cells = <0>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_tach0_default>; + }; + }; diff --git a/Documentation/devicetree/bindings/pwm/aspeed,ast2600-pwm.yaml b/Documentation/devicetree/bindings/pwm/aspeed,ast2600-pwm.yaml new file mode 100644 index 000000000000..f501f8a769df --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/aspeed,ast2600-pwm.yaml @@ -0,0 +1,64 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (C) 2021 Aspeed, Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pwm/aspeed,ast2600-pwm.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Aspeed Ast2600 PWM controller + +maintainers: + - Billy Tsai + +description: | + The Aspeed PWM controller can support upto 16 PWM outputs. + This module is part of the ast2600-pwm-tach multi-function device. For more + details see ../mfd/aspeed,ast2600-pwm-tach.yaml. + +properties: + compatible: + enum: + - aspeed,ast2600-pwm + + "#pwm-cells": + const: 3 + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + pinctrl-0: true + + pinctrl-names: + const: default + +required: + - compatible + - "#pwm-cells" + - "#address-cells" + - "#size-cells" + +additionalProperties: + description: Set extend properties for each pwm channel. + type: object + properties: + reg: + description: + The pwm channel index. + maxItems: 1 + + aspeed,wdt-reload-enable: + type: boolean + description: + Enable the function of wdt reset reload duty point. + + aspeed,wdt-reload-duty-point: + description: + Define the duty point after wdt reset, 0 = 100% + minimum: 0 + maximum: 255 + + required: + - reg From patchwork Wed Nov 2 08:36:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Billy Tsai X-Patchwork-Id: 14080 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp3488067wru; Wed, 2 Nov 2022 01:37:02 -0700 (PDT) X-Google-Smtp-Source: AMsMyM7hUugoEFABMFmZDsUQdXaRDlOiSzA5m5hsdtMXhPqDa3E4SsJYRkVZrj++K30dfUqKMU3t X-Received: by 2002:a05:6402:50d4:b0:461:e349:56b2 with SMTP id h20-20020a05640250d400b00461e34956b2mr23759123edb.17.1667378221897; Wed, 02 Nov 2022 01:37:01 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1667378221; cv=none; d=google.com; s=arc-20160816; b=G/3hLgkwQSu65klUCxyMvvre00CdUbS9dmodifsANYNLrvUKOKOaezf3xS9rYeyBL2 wmalyRzE2NpbZruaDCi6uouIDI+z+x14vMRKtGg3qXOgdijQiRQaAUOPCTYFOXSgj418 KcYosdrc9/l5MSGK5QQ7QUxlAX46X3eDlkBR7AJN0v/hSE4r/C9qF6opdSFAlMWnUUjT BGNwZchFLipGZfmBRx5zbPnlFfdxEt/sAEBIDkcBcB9SeXRTEPg5o2cIwYSDLIZLmmvd MF764Z4dDqpatuWjb/LKLO7ft4/K8zmDD6HtdbJv74Fx2OQdvZqCbJ10+uRlt3+5zZnW 8WoA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from; bh=pInw2zSLWmjY0AECRmPvfAJrn5ik9Uv/UTRIFrMpmRQ=; b=AtikmzHk+JsMOShTi5ShGyF57bV7YnV+eUjX/hl39gpXbmr3kUVi9A4c6/o1NDoYWY 5b3o7hbBSzFeS51zZjo68net/wE3aGz5MhwxTAnHY3zx4ZAGOdjJxNqOinCXvsDOwSF+ /SUAs/fzrZ2HXHDgQiUJMtmZnNsBh0JbcHk/4T0WcIiVLMRoYd4AeqtPVKoeRx2MbskW Gid6kKe4WtveK79nX3RTrLaXubBJYp0rwVQ7mMvNjWP4HPxH2d+acJ/0ZqzkZPDAh2Mv eCUv/4N0VtVybAzg5lbOARxHBnKEkrgk9l81sxdmfWNe8TsfaMnp9IpZg+pv75a3gpeA 26Og== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id c37-20020a509fa8000000b0045c7c7b95easi14399387edf.73.2022.11.02.01.36.37; Wed, 02 Nov 2022 01:37:01 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230433AbiKBIet (ORCPT + 99 others); Wed, 2 Nov 2022 04:34:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41606 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230102AbiKBIen (ORCPT ); Wed, 2 Nov 2022 04:34:43 -0400 Received: from twspam01.aspeedtech.com (twspam01.aspeedtech.com [211.20.114.71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C41DE7646 for ; Wed, 2 Nov 2022 01:34:38 -0700 (PDT) Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 2A28BAHv072663; Wed, 2 Nov 2022 16:11:11 +0800 (GMT-8) (envelope-from billy_tsai@aspeedtech.com) Received: from BillyTsai-pc.aspeed.com (192.168.2.149) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 2 Nov 2022 16:34:24 +0800 From: Billy Tsai To: , , , , , , , , , , , , , , , , , CC: kernel test robot Subject: [v3 2/3] pwm: Add Aspeed ast2600 PWM support Date: Wed, 2 Nov 2022 16:36:00 +0800 Message-ID: <20221102083601.10456-3-billy_tsai@aspeedtech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221102083601.10456-1-billy_tsai@aspeedtech.com> References: <20221102083601.10456-1-billy_tsai@aspeedtech.com> MIME-Version: 1.0 X-Originating-IP: [192.168.2.149] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 2A28BAHv072663 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1748372786111574393?= X-GMAIL-MSGID: =?utf-8?q?1748372786111574393?= This patch add the support of PWM controller which can be found at aspeed ast2600 soc. The pwm supoorts up to 16 channels and it's part function of multi-function device "pwm-tach controller". Signed-off-by: Billy Tsai Reviewed-by: Uwe Kleine-König Reported-by: kernel test robot --- drivers/pwm/Kconfig | 10 + drivers/pwm/Makefile | 1 + drivers/pwm/pwm-aspeed-ast2600.c | 319 +++++++++++++++++++++++++++++++ 3 files changed, 330 insertions(+) create mode 100644 drivers/pwm/pwm-aspeed-ast2600.c diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index aa29841bbb79..3313f074f15e 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -51,6 +51,16 @@ config PWM_AB8500 To compile this driver as a module, choose M here: the module will be called pwm-ab8500. +config PWM_ASPEED_AST2600 + tristate "Aspeed ast2600 PWM support" + depends on ARCH_ASPEED || COMPILE_TEST + depends on HAVE_CLK && HAS_IOMEM + help + This driver provides support for Aspeed ast2600 PWM controllers. + + To compile this driver as a module, choose M here: the module + will be called pwm-aspeed-ast2600. + config PWM_ATMEL tristate "Atmel PWM support" depends on ARCH_AT91 || COMPILE_TEST diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index 708840b7fba8..6be0c67bf08a 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_PWM) += core.o obj-$(CONFIG_PWM_SYSFS) += sysfs.o obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o +obj-$(CONFIG_PWM_ASPEED_AST2600) += pwm-aspeed-ast2600.o obj-$(CONFIG_PWM_ATMEL) += pwm-atmel.o obj-$(CONFIG_PWM_ATMEL_HLCDC_PWM) += pwm-atmel-hlcdc.o obj-$(CONFIG_PWM_ATMEL_TCB) += pwm-atmel-tcb.o diff --git a/drivers/pwm/pwm-aspeed-ast2600.c b/drivers/pwm/pwm-aspeed-ast2600.c new file mode 100644 index 000000000000..e571e9fadf0f --- /dev/null +++ b/drivers/pwm/pwm-aspeed-ast2600.c @@ -0,0 +1,319 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2021 Aspeed Technology Inc. + * + * PWM controller driver for Aspeed ast2600 SoCs. + * This drivers doesn't support earlier version of the IP. + * + * The hardware operates in time quantities of length + * Q := (DIV_L + 1) << DIV_H / input-clk + * The length of a PWM period is (DUTY_CYCLE_PERIOD + 1) * Q. + * The maximal value for DUTY_CYCLE_PERIOD is used here to provide + * a fine grained selection for the duty cycle. + * + * This driver uses DUTY_CYCLE_RISING_POINT = 0, so from the start of a + * period the output is active until DUTY_CYCLE_FALLING_POINT * Q. Note + * that if DUTY_CYCLE_RISING_POINT = DUTY_CYCLE_FALLING_POINT the output is + * always active. + * + * Register usage: + * PIN_ENABLE: When it is unset the pwm controller will emit inactive level to the external. + * Use to determine whether the PWM channel is enabled or disabled + * CLK_ENABLE: When it is unset the pwm controller will assert the duty counter reset and + * emit inactive level to the PIN_ENABLE mux after that the driver can still change the pwm period + * and duty and the value will apply when CLK_ENABLE be set again. + * Use to determine whether duty_cycle bigger than 0. + * PWM_ASPEED_CTRL_INVERSE: When it is toggled the output value will inverse immediately. + * PWM_ASPEED_DUTY_CYCLE_FALLING_POINT/PWM_ASPEED_DUTY_CYCLE_RISING_POINT: When these two + * values are equal it means the duty cycle = 100%. + * + * The glitch may generate at: + * - Enabled changing when the duty_cycle bigger than 0% and less than 100%. + * - Polarity changing when the duty_cycle bigger than 0% and less than 100%. + * + * Limitations: + * - When changing both duty cycle and period, we cannot prevent in + * software that the output might produce a period with mixed + * settings. + * - Disabling the PWM doesn't complete the current period. + * + * Improvements: + * - When only changing one of duty cycle or period, our pwm controller will not + * generate the glitch, the configure will change at next cycle of pwm. + * This improvement can disable/enable through PWM_ASPEED_CTRL_DUTY_SYNC_DISABLE. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* The channel number of Aspeed pwm controller */ +#define PWM_ASPEED_NR_PWMS 16 +/* PWM Control Register */ +#define PWM_ASPEED_CTRL(ch) ((ch) * 0x10 + 0x00) +#define PWM_ASPEED_CTRL_LOAD_SEL_RISING_AS_WDT BIT(19) +#define PWM_ASPEED_CTRL_DUTY_LOAD_AS_WDT_ENABLE BIT(18) +#define PWM_ASPEED_CTRL_DUTY_SYNC_DISABLE BIT(17) +#define PWM_ASPEED_CTRL_CLK_ENABLE BIT(16) +#define PWM_ASPEED_CTRL_LEVEL_OUTPUT BIT(15) +#define PWM_ASPEED_CTRL_INVERSE BIT(14) +#define PWM_ASPEED_CTRL_OPEN_DRAIN_ENABLE BIT(13) +#define PWM_ASPEED_CTRL_PIN_ENABLE BIT(12) +#define PWM_ASPEED_CTRL_CLK_DIV_H GENMASK(11, 8) +#define PWM_ASPEED_CTRL_CLK_DIV_L GENMASK(7, 0) + +/* PWM Duty Cycle Register */ +#define PWM_ASPEED_DUTY_CYCLE(ch) ((ch) * 0x10 + 0x04) +#define PWM_ASPEED_DUTY_CYCLE_PERIOD GENMASK(31, 24) +#define PWM_ASPEED_DUTY_CYCLE_POINT_AS_WDT GENMASK(23, 16) +#define PWM_ASPEED_DUTY_CYCLE_FALLING_POINT GENMASK(15, 8) +#define PWM_ASPEED_DUTY_CYCLE_RISING_POINT GENMASK(7, 0) + +/* PWM fixed value */ +#define PWM_ASPEED_FIXED_PERIOD FIELD_MAX(PWM_ASPEED_DUTY_CYCLE_PERIOD) + +struct aspeed_pwm_data { + struct pwm_chip chip; + struct clk *clk; + struct regmap *regmap; + struct reset_control *reset; +}; + +static inline struct aspeed_pwm_data * +aspeed_pwm_chip_to_data(struct pwm_chip *chip) +{ + return container_of(chip, struct aspeed_pwm_data, chip); +} + +static void aspeed_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) +{ + struct device *dev = chip->dev; + struct aspeed_pwm_data *priv = aspeed_pwm_chip_to_data(chip); + u32 hwpwm = pwm->hwpwm; + bool polarity, pin_en, clk_en; + u32 duty_pt, val; + unsigned long rate; + u64 div_h, div_l, duty_cycle_period, dividend; + + regmap_read(priv->regmap, PWM_ASPEED_CTRL(hwpwm), &val); + polarity = FIELD_GET(PWM_ASPEED_CTRL_INVERSE, val); + pin_en = FIELD_GET(PWM_ASPEED_CTRL_PIN_ENABLE, val); + clk_en = FIELD_GET(PWM_ASPEED_CTRL_CLK_ENABLE, val); + div_h = FIELD_GET(PWM_ASPEED_CTRL_CLK_DIV_H, val); + div_l = FIELD_GET(PWM_ASPEED_CTRL_CLK_DIV_L, val); + regmap_read(priv->regmap, PWM_ASPEED_DUTY_CYCLE(hwpwm), &val); + duty_pt = FIELD_GET(PWM_ASPEED_DUTY_CYCLE_FALLING_POINT, val); + duty_cycle_period = FIELD_GET(PWM_ASPEED_DUTY_CYCLE_PERIOD, val); + + rate = clk_get_rate(priv->clk); + + /* + * This multiplication doesn't overflow, the upper bound is + * 1000000000 * 256 * 256 << 15 = 0x1dcd650000000000 + */ + dividend = (u64)NSEC_PER_SEC * (div_l + 1) * (duty_cycle_period + 1) + << div_h; + state->period = DIV_ROUND_UP_ULL(dividend, rate); + + if (clk_en && duty_pt) { + dividend = (u64)NSEC_PER_SEC * (div_l + 1) * duty_pt + << div_h; + state->duty_cycle = DIV_ROUND_UP_ULL(dividend, rate); + } else { + state->duty_cycle = clk_en ? state->period : 0; + } + state->polarity = polarity ? PWM_POLARITY_INVERSED : PWM_POLARITY_NORMAL; + state->enabled = pin_en; + dev_dbg(dev, "get period: %lldns, duty_cycle: %lldns", state->period, + state->duty_cycle); +} + +static int aspeed_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) +{ + struct device *dev = chip->dev; + struct aspeed_pwm_data *priv = aspeed_pwm_chip_to_data(chip); + u32 hwpwm = pwm->hwpwm, duty_pt; + unsigned long rate; + u64 div_h, div_l, divisor, expect_period; + bool clk_en; + + rate = clk_get_rate(priv->clk); + expect_period = min(div64_u64(ULLONG_MAX, (u64)rate), state->period); + dev_dbg(dev, "expect period: %lldns, duty_cycle: %lldns", expect_period, + state->duty_cycle); + /* + * Pick the smallest value for div_h so that div_l can be the biggest + * which results in a finer resolution near the target period value. + */ + divisor = (u64)NSEC_PER_SEC * (PWM_ASPEED_FIXED_PERIOD + 1) * + (FIELD_MAX(PWM_ASPEED_CTRL_CLK_DIV_L) + 1); + div_h = order_base_2(DIV64_U64_ROUND_UP(rate * expect_period, divisor)); + if (div_h > 0xf) + div_h = 0xf; + + divisor = ((u64)NSEC_PER_SEC * (PWM_ASPEED_FIXED_PERIOD + 1)) << div_h; + div_l = div64_u64(rate * expect_period, divisor); + + if (div_l == 0) + return -ERANGE; + + div_l -= 1; + + if (div_l > 255) + div_l = 255; + + dev_dbg(dev, "clk source: %ld div_h %lld, div_l : %lld\n", rate, div_h, + div_l); + /* duty_pt = duty_cycle * (PERIOD + 1) / period */ + duty_pt = div64_u64(state->duty_cycle * rate, + (u64)NSEC_PER_SEC * (div_l + 1) << div_h); + dev_dbg(dev, "duty_cycle = %lld, duty_pt = %d\n", state->duty_cycle, + duty_pt); + + /* + * Fixed DUTY_CYCLE_PERIOD to its max value to get a + * fine-grained resolution for duty_cycle at the expense of a + * coarser period resolution. + */ + regmap_update_bits(priv->regmap, PWM_ASPEED_DUTY_CYCLE(hwpwm), + PWM_ASPEED_DUTY_CYCLE_PERIOD, + FIELD_PREP(PWM_ASPEED_DUTY_CYCLE_PERIOD, + PWM_ASPEED_FIXED_PERIOD)); + if (duty_pt == 0) { + /* emit inactive level and assert the duty counter reset */ + clk_en = 0; + } else { + clk_en = 1; + if (duty_pt >= (PWM_ASPEED_FIXED_PERIOD + 1)) + duty_pt = 0; + regmap_update_bits(priv->regmap, PWM_ASPEED_DUTY_CYCLE(hwpwm), + PWM_ASPEED_DUTY_CYCLE_RISING_POINT | + PWM_ASPEED_DUTY_CYCLE_FALLING_POINT, + FIELD_PREP(PWM_ASPEED_DUTY_CYCLE_FALLING_POINT, duty_pt)); + } + + regmap_update_bits(priv->regmap, PWM_ASPEED_CTRL(hwpwm), + PWM_ASPEED_CTRL_CLK_DIV_H | PWM_ASPEED_CTRL_CLK_DIV_L | + PWM_ASPEED_CTRL_PIN_ENABLE | PWM_ASPEED_CTRL_CLK_ENABLE | + PWM_ASPEED_CTRL_INVERSE, + FIELD_PREP(PWM_ASPEED_CTRL_CLK_DIV_H, div_h) | + FIELD_PREP(PWM_ASPEED_CTRL_CLK_DIV_L, div_l) | + FIELD_PREP(PWM_ASPEED_CTRL_PIN_ENABLE, state->enabled) | + FIELD_PREP(PWM_ASPEED_CTRL_CLK_ENABLE, clk_en) | + FIELD_PREP(PWM_ASPEED_CTRL_INVERSE, state->polarity)); + return 0; +} + +static const struct pwm_ops aspeed_pwm_ops = { + .apply = aspeed_pwm_apply, + .get_state = aspeed_pwm_get_state, + .owner = THIS_MODULE, +}; + +static void aspeed_pwm_reset_assert(void *data) +{ + struct reset_control *rst = data; + + reset_control_assert(rst); +} + +static void aspeed_pwm_chip_remove(void *data) +{ + struct pwm_chip *chip = data; + + pwmchip_remove(chip); +} + +static int aspeed_pwm_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + int ret; + struct aspeed_pwm_data *priv; + struct device_node *np; + struct platform_device *parent_dev; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + np = pdev->dev.parent->of_node; + if (!of_device_is_compatible(np, "aspeed,ast2600-pwm-tach")) + return dev_err_probe(dev, -ENODEV, + "Unsupported pwm device binding\n"); + + priv->regmap = syscon_node_to_regmap(np); + if (IS_ERR(priv->regmap)) + return dev_err_probe(dev, PTR_ERR(priv->regmap), + "Couldn't get regmap\n"); + + parent_dev = of_find_device_by_node(np); + priv->clk = devm_clk_get_enabled(&parent_dev->dev, NULL); + if (IS_ERR(priv->clk)) + return dev_err_probe(dev, PTR_ERR(priv->clk), + "Couldn't get clock\n"); + + priv->reset = devm_reset_control_get_shared(&parent_dev->dev, NULL); + if (IS_ERR(priv->reset)) + return dev_err_probe(dev, PTR_ERR(priv->reset), + "Couldn't get reset control\n"); + + ret = reset_control_deassert(priv->reset); + if (ret) + return dev_err_probe(dev, ret, + "Couldn't deassert reset control\n"); + + ret = devm_add_action_or_reset(dev, aspeed_pwm_reset_assert, + priv->reset); + if (ret) + return ret; + + priv->chip.dev = dev; + priv->chip.ops = &aspeed_pwm_ops; + priv->chip.npwm = PWM_ASPEED_NR_PWMS; + + ret = pwmchip_add(&priv->chip); + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to add PWM chip\n"); + ret = devm_add_action_or_reset(dev, aspeed_pwm_chip_remove, + &priv->chip); + if (ret) + return ret; + return 0; +} + +static const struct of_device_id of_pwm_match_table[] = { + { + .compatible = "aspeed,ast2600-pwm", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_pwm_match_table); + +static struct platform_driver aspeed_pwm_driver = { + .probe = aspeed_pwm_probe, + .driver = { + .name = "aspeed-pwm", + .of_match_table = of_pwm_match_table, + }, +}; + +module_platform_driver(aspeed_pwm_driver); + +MODULE_AUTHOR("Billy Tsai "); +MODULE_DESCRIPTION("Aspeed ast2600 PWM device driver"); +MODULE_LICENSE("GPL v2"); From patchwork Wed Nov 2 08:36:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Billy Tsai X-Patchwork-Id: 14082 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp3488162wru; Wed, 2 Nov 2022 01:37:18 -0700 (PDT) X-Google-Smtp-Source: AMsMyM4V8B3Kh+GxUc0dCvIfHcLf3xiHiWPsNvb2dG5dFqtdG5w6hWIQsrZc3oNAhHYZmQK0HjLV X-Received: by 2002:a17:906:371a:b0:7ad:c01c:6fa0 with SMTP id d26-20020a170906371a00b007adc01c6fa0mr17972391ejc.267.1667378238123; Wed, 02 Nov 2022 01:37:18 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1667378238; cv=none; d=google.com; s=arc-20160816; b=FoP2RaOMWASmn7OEuu/a3IOB0wQTtldNjpImwIB0ynf0KzKDjaeFEYDA5minjpoU4b xOgLE5L9NoZw+DFKYhDRu/1jdzlQR5mCYkWCxDmUqu2shVDMlHIhIowC+Vjdd5C8bQFz UbIlDMMCEWRBBON3wVVl906aY+0x3zCsszeZcVcPAGAA0eE8u8libOP6skUgX+FL+v7G 6bXvsbBFiMxPhJJbpl2FxD5WvMi/6SQNeS3IWVIyRGycfEfUs70wAcquyIgxmq5dhY2h ITi2B+9/MRlJzuzR4vova0ms+QTJ14QUcvYDlVY0PPuydhghLnsQ1tyy5A8Z8pKP7MgG imFw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from; bh=z4GLFC7JWa8swqMDDiSUA6e+dAfMXEQi6g0IzFlACf4=; b=aTS2UYr+ncPDCXQY5lc2bxif9HN28fOhwvM5Gbp48Wgv21fZNs573vPy9TeiUqsNxt +gVUUqOqNpzGk4TdrQ/SHiT4YnCp00ll0fGawRE2d2++cBUlsHN1KGN2lG0LoYw2M096 XU3GXiz2gQ5h/kswUWwauRabYfajWOhO56OLm0G8MwyfCwIBc17ZQEn0zmn+hwM8ccwt AbafuR4CLvK25KKD+Mc/UklMcnlKIIaGdIpdHHT/omgljIfcCRvSkPVkpuC3U9U3qn4k o7cNUGX2OYrCFhj1SEs6O+Co5BQVEir1IsYRAx7/5WWCZW7mOh1QRALv88zoPaVNSTMm LKoA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id hw19-20020a170907a0d300b0077083e6dde7si11107875ejc.183.2022.11.02.01.36.54; Wed, 02 Nov 2022 01:37:18 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230383AbiKBIey (ORCPT + 99 others); Wed, 2 Nov 2022 04:34:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41598 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230387AbiKBIeq (ORCPT ); Wed, 2 Nov 2022 04:34:46 -0400 Received: from twspam01.aspeedtech.com (twspam01.aspeedtech.com [211.20.114.71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0FD3F6359 for ; Wed, 2 Nov 2022 01:34:43 -0700 (PDT) Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 2A28BAHw072663; Wed, 2 Nov 2022 16:11:11 +0800 (GMT-8) (envelope-from billy_tsai@aspeedtech.com) Received: from BillyTsai-pc.aspeed.com (192.168.2.149) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 2 Nov 2022 16:34:24 +0800 From: Billy Tsai To: , , , , , , , , , , , , , , , , , CC: kernel test robot Subject: [v3 3/3] hwmon: Add Aspeed ast2600 TACH support Date: Wed, 2 Nov 2022 16:36:01 +0800 Message-ID: <20221102083601.10456-4-billy_tsai@aspeedtech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221102083601.10456-1-billy_tsai@aspeedtech.com> References: <20221102083601.10456-1-billy_tsai@aspeedtech.com> MIME-Version: 1.0 X-Originating-IP: [192.168.2.149] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 2A28BAHw072663 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1748372803259789375?= X-GMAIL-MSGID: =?utf-8?q?1748372803259789375?= This patch add the support of Tachometer which can use to monitor the frequency of the input. The tach supports up to 16 channels and it's part function of multi-function device "pwm-tach controller". Signed-off-by: Billy Tsai Reported-by: kernel test robot --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/tach-aspeed-ast2600.rst | 28 ++ drivers/hwmon/Kconfig | 9 + drivers/hwmon/Makefile | 1 + drivers/hwmon/tach-aspeed-ast2600.c | 476 ++++++++++++++++++++ 5 files changed, 515 insertions(+) create mode 100644 Documentation/hwmon/tach-aspeed-ast2600.rst create mode 100644 drivers/hwmon/tach-aspeed-ast2600.c diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index f790f1260c33..c4c0559fd4fa 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -179,6 +179,7 @@ Hardware Monitoring Kernel Drivers smsc47m1 sparx5-temp stpddc60 + tach-aspeed-ast2600 tc654 tc74 thmc50 diff --git a/Documentation/hwmon/tach-aspeed-ast2600.rst b/Documentation/hwmon/tach-aspeed-ast2600.rst new file mode 100644 index 000000000000..8967f60672dc --- /dev/null +++ b/Documentation/hwmon/tach-aspeed-ast2600.rst @@ -0,0 +1,28 @@ +Kernel driver tach-aspeed-ast2600 +============================== + +Supported chips: + ASPEED AST2600 + +Authors: + + +Description: +------------ +This driver implements support for ASPEED AST2600 Fan Tacho controller. +The controller supports up to 16 tachometer inputs. + +The driver provides the following sensor accesses in sysfs: +=============== ======= ===================================================== +fanX_input ro provide current fan rotation value in RPM as reported + by the fan to the device. +fanX_div rw Fan divisor: Supported value are power of 4 (1, 4, 16 + 64, ... 4194304) + The larger divisor, the less rpm accuracy and the less + affected by fan signal glitch. +fanX_min rw Fan minimum RPM which can used to change the timeout + value for controller polling the result. +fanX_max rw Fan maximum RPM which can used to change the polling + period of the driver. +fanX_pulses rw Fan pulses per resolution. +=============== ======= ====================================================== diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index fa2356398744..a84c15b73aa6 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -397,6 +397,15 @@ config SENSORS_ASPEED This driver can also be built as a module. If so, the module will be called aspeed_pwm_tacho. +config SENSORS_TACH_ASPEED_AST2600 + tristate "ASPEED ast2600 Tachometer support" + select REGMAP + help + This driver provides support for Aspeed ast2600 Tachometer. + + To compile this driver as a module, choose M here: the module + will be called tach-aspeed-ast2600. + config SENSORS_ATXP1 tristate "Attansic ATXP1 VID controller" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index d2497b2644e6..7e2d708e93b8 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -51,6 +51,7 @@ obj-$(CONFIG_SENSORS_ARM_SCMI) += scmi-hwmon.o obj-$(CONFIG_SENSORS_ARM_SCPI) += scpi-hwmon.o obj-$(CONFIG_SENSORS_AS370) += as370-hwmon.o obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o +obj-$(CONFIG_SENSORS_TACH_ASPEED_AST2600) += tach-aspeed-ast2600.o obj-$(CONFIG_SENSORS_ASPEED) += aspeed-pwm-tacho.o obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o obj-$(CONFIG_SENSORS_AXI_FAN_CONTROL) += axi-fan-control.o diff --git a/drivers/hwmon/tach-aspeed-ast2600.c b/drivers/hwmon/tach-aspeed-ast2600.c new file mode 100644 index 000000000000..c10e6bc3c035 --- /dev/null +++ b/drivers/hwmon/tach-aspeed-ast2600.c @@ -0,0 +1,476 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) ASPEED Technology Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* The channel number of Aspeed tach controller */ +#define TACH_ASPEED_NR_TACHS 16 +/* TACH Control Register */ +#define TACH_ASPEED_CTRL(ch) (((ch) * 0x10) + 0x08) +#define TACH_ASPEED_IER BIT(31) +#define TACH_ASPEED_INVERS_LIMIT BIT(30) +#define TACH_ASPEED_LOOPBACK BIT(29) +#define TACH_ASPEED_ENABLE BIT(28) +#define TACH_ASPEED_DEBOUNCE_MASK GENMASK(27, 26) +#define TACH_ASPEED_DEBOUNCE_BIT 26 +#define TACH_ASPEED_IO_EDGE_MASK GENMASK(25, 24) +#define TACH_ASPEED_IO_EDGE_BIT 24 +#define TACH_ASPEED_CLK_DIV_T_MASK GENMASK(23, 20) +#define TACH_ASPEED_CLK_DIV_BIT 20 +#define TACH_ASPEED_THRESHOLD_MASK GENMASK(19, 0) +/* [27:26] */ +#define DEBOUNCE_3_CLK 0x00 +#define DEBOUNCE_2_CLK 0x01 +#define DEBOUNCE_1_CLK 0x02 +#define DEBOUNCE_0_CLK 0x03 +/* [25:24] */ +#define F2F_EDGES 0x00 +#define R2R_EDGES 0x01 +#define BOTH_EDGES 0x02 +/* [23:20] */ +/* divisor = 4 to the nth power, n = register value */ +#define DEFAULT_TACH_DIV 1024 +#define DIV_TO_REG(divisor) (ilog2(divisor) >> 1) + +/* TACH Status Register */ +#define TACH_ASPEED_STS(ch) (((ch) * 0x10) + 0x0C) + +/*PWM_TACH_STS */ +#define TACH_ASPEED_ISR BIT(31) +#define TACH_ASPEED_PWM_OUT BIT(25) +#define TACH_ASPEED_PWM_OEN BIT(24) +#define TACH_ASPEED_DEB_INPUT BIT(23) +#define TACH_ASPEED_RAW_INPUT BIT(22) +#define TACH_ASPEED_VALUE_UPDATE BIT(21) +#define TACH_ASPEED_FULL_MEASUREMENT BIT(20) +#define TACH_ASPEED_VALUE_MASK GENMASK(19, 0) +/********************************************************** + * Software setting + *********************************************************/ +#define DEFAULT_FAN_MIN_RPM 1000 +#define DEFAULT_FAN_PULSE_PR 2 +/* + * Add this value to avoid CPU consuming a lot of resources in waiting rpm + * updating. Assume the max rpm of fan is 60000, the fastest period of updating + * tach value will be equal to (1000000 * 2 * 60) / (2 * max_rpm) = 1000us. + */ +#define DEFAULT_FAN_MAX_RPM 60000 + +struct aspeed_tach_channel_params { + int limited_inverse; + u16 threshold; + u8 tach_edge; + u8 tach_debounce; + u8 pulse_pr; + u32 min_rpm; + u32 max_rpm; + u32 divisor; + u32 sample_period; /* unit is us */ + u32 polling_period; /* unit is us */ +}; + +struct aspeed_tach_data { + struct device *dev; + struct regmap *regmap; + struct clk *clk; + struct reset_control *reset; + bool tach_present[TACH_ASPEED_NR_TACHS]; + struct aspeed_tach_channel_params *tach_channel; +}; + +static void aspeed_update_tach_sample_period(struct aspeed_tach_data *priv, + u8 fan_tach_ch) +{ + u32 tach_period_us; + u8 pulse_pr = priv->tach_channel[fan_tach_ch].pulse_pr; + u32 min_rpm = priv->tach_channel[fan_tach_ch].min_rpm; + + /* + * min(Tach input clock) = (PulsePR * minRPM) / 60 + * max(Tach input period) = 60 / (PulsePR * minRPM) + * Tach sample period > 2 * max(Tach input period) = (2*60) / (PulsePR * minRPM) + */ + tach_period_us = (USEC_PER_SEC * 2 * 60) / (pulse_pr * min_rpm); + /* Add the margin (about 1.5) of tach sample period to avoid sample miss */ + tach_period_us = (tach_period_us * 1500) >> 10; + dev_dbg(priv->dev, "tach%d sample period = %dus", fan_tach_ch, tach_period_us); + priv->tach_channel[fan_tach_ch].sample_period = tach_period_us; +} + +static void aspeed_update_tach_polling_period(struct aspeed_tach_data *priv, + u8 fan_tach_ch) +{ + u32 tach_period_us; + u8 pulse_pr = priv->tach_channel[fan_tach_ch].pulse_pr; + u32 max_rpm = priv->tach_channel[fan_tach_ch].max_rpm; + + tach_period_us = (USEC_PER_SEC * 2 * 60) / (pulse_pr * max_rpm); + dev_dbg(priv->dev, "tach%d polling period = %dus", fan_tach_ch, tach_period_us); + priv->tach_channel[fan_tach_ch].polling_period = tach_period_us; +} + +static void aspeed_tach_ch_enable(struct aspeed_tach_data *priv, u8 tach_ch, + bool enable) +{ + if (enable) + regmap_set_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_ENABLE); + else + regmap_clear_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_ENABLE); +} + +static int aspeed_get_fan_tach_ch_rpm(struct aspeed_tach_data *priv, + u8 fan_tach_ch) +{ + u32 raw_data, tach_div, val; + unsigned long clk_source; + u64 rpm; + int ret; + + ret = regmap_read_poll_timeout(priv->regmap, TACH_ASPEED_STS(fan_tach_ch), val, + (val & TACH_ASPEED_FULL_MEASUREMENT) && + (val & TACH_ASPEED_VALUE_UPDATE), + priv->tach_channel[fan_tach_ch].polling_period, + priv->tach_channel[fan_tach_ch].sample_period); + + if (ret) { + /* return 0 if we didn't get an answer because of timeout */ + if (ret == -ETIMEDOUT) + return 0; + return ret; + } + + raw_data = val & TACH_ASPEED_VALUE_MASK; + /* + * We need the mode to determine if the raw_data is double (from + * counting both edges). + */ + if (priv->tach_channel[fan_tach_ch].tach_edge == BOTH_EDGES) + raw_data <<= 1; + + tach_div = raw_data * (priv->tach_channel[fan_tach_ch].divisor) * + (priv->tach_channel[fan_tach_ch].pulse_pr); + + clk_source = clk_get_rate(priv->clk); + dev_dbg(priv->dev, "clk %ld, raw_data %d , tach_div %d\n", clk_source, + raw_data, tach_div); + + if (tach_div == 0) + return -EDOM; + + rpm = (u64)clk_source * 60; + do_div(rpm, tach_div); + + return rpm; +} + +static int aspeed_tach_hwmon_read(struct device *dev, + enum hwmon_sensor_types type, u32 attr, + int channel, long *val) +{ + struct aspeed_tach_data *priv = dev_get_drvdata(dev); + u32 reg_val; + int ret; + + switch (attr) { + case hwmon_fan_input: + ret = aspeed_get_fan_tach_ch_rpm(priv, channel); + if (ret < 0) + return ret; + *val = ret; + break; + case hwmon_fan_min: + *val = priv->tach_channel[channel].min_rpm; + break; + case hwmon_fan_max: + *val = priv->tach_channel[channel].max_rpm; + break; + case hwmon_fan_div: + regmap_read(priv->regmap, TACH_ASPEED_CTRL(channel), ®_val); + reg_val = FIELD_GET(TACH_ASPEED_CLK_DIV_T_MASK, reg_val); + *val = BIT(reg_val << 1); + break; + case hwmon_fan_pulses: + *val = priv->tach_channel[channel].pulse_pr; + break; + default: + return -EOPNOTSUPP; + } + return 0; +} + +static int aspeed_tach_hwmon_write(struct device *dev, + enum hwmon_sensor_types type, u32 attr, + int channel, long val) +{ + struct aspeed_tach_data *priv = dev_get_drvdata(dev); + + switch (attr) { + case hwmon_fan_min: + priv->tach_channel[channel].min_rpm = val; + aspeed_update_tach_sample_period(priv, channel); + break; + case hwmon_fan_max: + priv->tach_channel[channel].max_rpm = val; + aspeed_update_tach_polling_period(priv, channel); + break; + case hwmon_fan_div: + if (!(is_power_of_2(val) && !(ilog2(val) % 2))) { + dev_err(dev, + "fan_div value %ld not supported. Only support power of 4\n", + val); + return -EINVAL; + } + priv->tach_channel[channel].divisor = val; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(channel), + TACH_ASPEED_CLK_DIV_T_MASK, + DIV_TO_REG(priv->tach_channel[channel].divisor) + << TACH_ASPEED_CLK_DIV_BIT); + break; + case hwmon_fan_pulses: + priv->tach_channel[channel].pulse_pr = val; + aspeed_update_tach_sample_period(priv, channel); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static umode_t aspeed_tach_dev_is_visible(const void *drvdata, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + const struct aspeed_tach_data *priv = drvdata; + + if (!priv->tach_present[channel]) + return 0; + switch (attr) { + case hwmon_fan_input: + return 0444; + case hwmon_fan_min: + case hwmon_fan_max: + case hwmon_fan_div: + case hwmon_fan_pulses: + return 0644; + } + return 0; +} + +static const struct hwmon_ops aspeed_tach_ops = { + .is_visible = aspeed_tach_dev_is_visible, + .read = aspeed_tach_hwmon_read, + .write = aspeed_tach_hwmon_write, +}; + +static const struct hwmon_channel_info *aspeed_tach_info[] = { + HWMON_CHANNEL_INFO(fan, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES), + NULL +}; + +static const struct hwmon_chip_info aspeed_tach_chip_info = { + .ops = &aspeed_tach_ops, + .info = aspeed_tach_info, +}; + +static void aspeed_create_fan_tach_channel(struct aspeed_tach_data *priv, + u32 tach_ch) +{ + priv->tach_present[tach_ch] = true; + priv->tach_channel[tach_ch].limited_inverse = 0; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_INVERS_LIMIT, + priv->tach_channel[tach_ch].limited_inverse ? + TACH_ASPEED_INVERS_LIMIT : + 0); + + priv->tach_channel[tach_ch].tach_debounce = DEBOUNCE_3_CLK; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_DEBOUNCE_MASK, + priv->tach_channel[tach_ch].tach_debounce + << TACH_ASPEED_DEBOUNCE_BIT); + + priv->tach_channel[tach_ch].tach_edge = F2F_EDGES; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_IO_EDGE_MASK, + priv->tach_channel[tach_ch].tach_edge + << TACH_ASPEED_IO_EDGE_BIT); + + priv->tach_channel[tach_ch].divisor = DEFAULT_TACH_DIV; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_CLK_DIV_T_MASK, + DIV_TO_REG(priv->tach_channel[tach_ch].divisor) + << TACH_ASPEED_CLK_DIV_BIT); + + priv->tach_channel[tach_ch].threshold = 0; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_THRESHOLD_MASK, + priv->tach_channel[tach_ch].threshold); + + priv->tach_channel[tach_ch].pulse_pr = DEFAULT_FAN_PULSE_PR; + priv->tach_channel[tach_ch].min_rpm = DEFAULT_FAN_MIN_RPM; + aspeed_update_tach_sample_period(priv, tach_ch); + + priv->tach_channel[tach_ch].max_rpm = DEFAULT_FAN_MAX_RPM; + aspeed_update_tach_polling_period(priv, tach_ch); + + aspeed_tach_ch_enable(priv, tach_ch, true); +} + +static int aspeed_tach_create_fan(struct device *dev, struct device_node *child, + struct aspeed_tach_data *priv) +{ + u32 tach_channel; + int ret; + + ret = of_property_read_u32(child, "reg", &tach_channel); + if (ret) + return ret; + + aspeed_create_fan_tach_channel(priv, tach_channel); + + return 0; +} + +static void aspeed_tach_reset_assert(void *data) +{ + struct reset_control *rst = data; + + reset_control_assert(rst); +} + +static int aspeed_tach_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np, *child; + struct aspeed_tach_data *priv; + struct device *hwmon; + struct platform_device *parent_dev; + int ret; + + np = dev->parent->of_node; + if (!of_device_is_compatible(np, "aspeed,ast2600-pwm-tach")) + return dev_err_probe(dev, -ENODEV, + "Unsupported tach device binding\n"); + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + priv->dev = &pdev->dev; + priv->tach_channel = + devm_kcalloc(dev, TACH_ASPEED_NR_TACHS, + sizeof(*priv->tach_channel), GFP_KERNEL); + + priv->regmap = syscon_node_to_regmap(np); + if (IS_ERR(priv->regmap)) + return dev_err_probe(dev, PTR_ERR(priv->regmap), + "Couldn't get regmap\n"); + parent_dev = of_find_device_by_node(np); + priv->clk = devm_clk_get_enabled(&parent_dev->dev, NULL); + if (IS_ERR(priv->clk)) + return dev_err_probe(dev, PTR_ERR(priv->clk), + "Couldn't get clock\n"); + + priv->reset = devm_reset_control_get_shared(&parent_dev->dev, NULL); + if (IS_ERR(priv->reset)) + return dev_err_probe(dev, PTR_ERR(priv->reset), + "Couldn't get reset control\n"); + + ret = reset_control_deassert(priv->reset); + if (ret) + return dev_err_probe(dev, ret, + "Couldn't deassert reset control\n"); + + ret = devm_add_action_or_reset(dev, aspeed_tach_reset_assert, + priv->reset); + if (ret) + return ret; + + for_each_child_of_node(dev->of_node, child) { + ret = aspeed_tach_create_fan(dev, child, priv); + if (ret) { + of_node_put(child); + return ret; + } + } + + hwmon = devm_hwmon_device_register_with_info(dev, "aspeed_tach", priv, + &aspeed_tach_chip_info, NULL); + ret = PTR_ERR_OR_ZERO(hwmon); + if (ret) + return dev_err_probe(dev, ret, + "Failed to register hwmon device\n"); + return 0; +} + +static const struct of_device_id of_stach_match_table[] = { + { + .compatible = "aspeed,ast2600-tach", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_stach_match_table); + +static struct platform_driver aspeed_tach_driver = { + .probe = aspeed_tach_probe, + .driver = { + .name = "aspeed_tach", + .of_match_table = of_stach_match_table, + }, +}; + +module_platform_driver(aspeed_tach_driver); + +MODULE_AUTHOR("Billy Tsai "); +MODULE_DESCRIPTION("Aspeed ast2600 TACH device driver"); +MODULE_LICENSE("GPL v2"); +