From patchwork Thu Nov 5 05:49:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rahul Tanwar X-Patchwork-Id: 1394740 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CRXfd0lx5z9sTD for ; Thu, 5 Nov 2020 16:50:01 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726746AbgKEFuA (ORCPT ); Thu, 5 Nov 2020 00:50:00 -0500 Received: from mga01.intel.com ([192.55.52.88]:1217 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726626AbgKEFuA (ORCPT ); Thu, 5 Nov 2020 00:50:00 -0500 IronPort-SDR: uev50CdBgzIrOX8PFG79O5C+2+ippacr6PoXsSuapN1sm61k7mkTfsQmNDHuwtKkdNxSARSXGN X493IB511IEg== X-IronPort-AV: E=McAfee;i="6000,8403,9795"; a="187233773" X-IronPort-AV: E=Sophos;i="5.77,452,1596524400"; d="scan'208";a="187233773" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2020 21:49:55 -0800 IronPort-SDR: Lhpsas59DHDM5q+c7wbzCfCfoHs1MbAQIWSuFOxsDgmIU1gL6M1+gaZjM9zj8XRhX03bEuVDJi zKNPFDdCTpjA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,452,1596524400"; d="scan'208";a="306385942" Received: from sgsxdev001.isng.intel.com (HELO localhost) ([10.226.88.11]) by fmsmga008.fm.intel.com with ESMTP; 04 Nov 2020 21:49:51 -0800 From: Rahul Tanwar To: u.kleine-koenig@pengutronix.de, linux-pwm@vger.kernel.org, lee.jones@linaro.org Cc: thierry.reding@gmail.com, p.zabel@pengutronix.de, robh+dt@kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, andriy.shevchenko@intel.com, songjun.Wu@intel.com, cheol.yong.kim@intel.com, qi-ming.wu@intel.com, rahul.tanwar.linux@gmail.com, Rahul Tanwar Subject: [PATCH v15 1/2] Add DT bindings YAML schema for PWM fan controller of LGM SoC Date: Thu, 5 Nov 2020 13:49:39 +0800 Message-Id: <335475f02291b33aa4817d786a9b28a6fb206fd3.1604555266.git.rahul.tanwar@linux.intel.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org Intel's LGM(Lightning Mountain) SoC contains a PWM fan controller which is only used to control the fan attached to the system. This PWM controller does not have any other consumer other than fan. Add DT bindings documentation for this PWM fan controller. Signed-off-by: Rahul Tanwar Reviewed-by: Rob Herring --- .../devicetree/bindings/pwm/intel,lgm-pwm.yaml | 44 ++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/intel,lgm-pwm.yaml diff --git a/Documentation/devicetree/bindings/pwm/intel,lgm-pwm.yaml b/Documentation/devicetree/bindings/pwm/intel,lgm-pwm.yaml new file mode 100644 index 000000000000..11a606536169 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/intel,lgm-pwm.yaml @@ -0,0 +1,44 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pwm/intel,lgm-pwm.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: LGM SoC PWM fan controller + +maintainers: + - Rahul Tanwar + +properties: + compatible: + const: intel,lgm-pwm + + reg: + maxItems: 1 + + "#pwm-cells": + const: 2 + + clocks: + maxItems: 1 + + resets: + maxItems: 1 + +required: + - compatible + - reg + - clocks + - resets + +additionalProperties: false + +examples: + - | + pwm: pwm@e0d00000 { + compatible = "intel,lgm-pwm"; + reg = <0xe0d00000 0x30>; + #pwm-cells = <2>; + clocks = <&cgu0 126>; + resets = <&rcu0 0x30 21>; + }; From patchwork Thu Nov 5 05:49:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Rahul Tanwar X-Patchwork-Id: 1394742 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CRXfn37B3z9sTD for ; Thu, 5 Nov 2020 16:50:09 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726721AbgKEFuI (ORCPT ); Thu, 5 Nov 2020 00:50:08 -0500 Received: from mga06.intel.com ([134.134.136.31]:64712 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725287AbgKEFuI (ORCPT ); Thu, 5 Nov 2020 00:50:08 -0500 IronPort-SDR: veT+hE9hhkaV9AzM336pHa1ZkKLdJMDeFhY/Ck4ktw01CEY2KxFFJh/repW3RuRrWECFNO76ED 1g8DJKK/0hyg== X-IronPort-AV: E=McAfee;i="6000,8403,9795"; a="230959630" X-IronPort-AV: E=Sophos;i="5.77,452,1596524400"; d="scan'208";a="230959630" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2020 21:50:01 -0800 IronPort-SDR: hxkKR//r7zq7cpK7F/yI25Jci1I8dkx0x4Vq44uS5thEVns1FT2KFpxURQZaTVJ09ItffrBx6a akkPOA+1HskA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,452,1596524400"; d="scan'208";a="306682695" Received: from sgsxdev001.isng.intel.com (HELO localhost) ([10.226.88.11]) by fmsmga007.fm.intel.com with ESMTP; 04 Nov 2020 21:49:57 -0800 From: Rahul Tanwar To: u.kleine-koenig@pengutronix.de, linux-pwm@vger.kernel.org, lee.jones@linaro.org Cc: thierry.reding@gmail.com, p.zabel@pengutronix.de, robh+dt@kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, andriy.shevchenko@intel.com, songjun.Wu@intel.com, cheol.yong.kim@intel.com, qi-ming.wu@intel.com, rahul.tanwar.linux@gmail.com, Rahul Tanwar Subject: [PATCH v15 2/2] Add PWM fan controller driver for LGM SoC Date: Thu, 5 Nov 2020 13:49:40 +0800 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org Intel Lightning Mountain(LGM) SoC contains a PWM fan controller. This PWM controller does not have any other consumer, it is a dedicated PWM controller for fan attached to the system. Add driver for this PWM fan controller. Signed-off-by: Rahul Tanwar Reviewed-by: Andy Shevchenko Reviewed-by: Uwe Kleine-König --- drivers/pwm/Kconfig | 11 ++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-intel-lgm.c | 244 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 256 insertions(+) create mode 100644 drivers/pwm/pwm-intel-lgm.c diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 63be5362fd3a..7218bf3665bc 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -232,6 +232,17 @@ config PWM_IMX_TPM To compile this driver as a module, choose M here: the module will be called pwm-imx-tpm. +config PWM_INTEL_LGM + tristate "Intel LGM PWM support" + depends on HAS_IOMEM + depends on (OF && X86) || COMPILE_TEST + select REGMAP_MMIO + help + Generic PWM fan controller driver for LGM SoC. + + To compile this driver as a module, choose M here: the module + will be called pwm-intel-lgm. + config PWM_IQS620A tristate "Azoteq IQS620A PWM support" depends on MFD_IQS62X || COMPILE_TEST diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index cbdcd55d69ee..71beaff894c1 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_PWM_IMG) += pwm-img.o obj-$(CONFIG_PWM_IMX1) += pwm-imx1.o obj-$(CONFIG_PWM_IMX27) += pwm-imx27.o obj-$(CONFIG_PWM_IMX_TPM) += pwm-imx-tpm.o +obj-$(CONFIG_PWM_INTEL_LGM) += pwm-intel-lgm.o obj-$(CONFIG_PWM_IQS620A) += pwm-iqs620a.o obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o obj-$(CONFIG_PWM_LP3943) += pwm-lp3943.o diff --git a/drivers/pwm/pwm-intel-lgm.c b/drivers/pwm/pwm-intel-lgm.c new file mode 100644 index 000000000000..e9e54dda07aa --- /dev/null +++ b/drivers/pwm/pwm-intel-lgm.c @@ -0,0 +1,244 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020 Intel Corporation. + * + * Limitations: + * - The hardware supports fixed period & configures only 2-wire mode. + * - Supports normal polarity. Does not support changing polarity. + * - When PWM is disabled, output of PWM will become 0(inactive). It doesn't + * keep track of running period. + * - When duty cycle is changed, PWM output may be a mix of previous setting + * and new setting for the first period. From second period, the output is + * based on new setting. + * - It is a dedicated PWM fan controller. There are no other consumers for + * this PWM controller. + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#define LGM_PWM_FAN_CON0 0x0 +#define LGM_PWM_FAN_EN_EN BIT(0) +#define LGM_PWM_FAN_EN_DIS 0x0 +#define LGM_PWM_FAN_EN_MSK BIT(0) +#define LGM_PWM_FAN_MODE_2WIRE 0x0 +#define LGM_PWM_FAN_MODE_MSK BIT(1) +#define LGM_PWM_FAN_DC_MSK GENMASK(23, 16) + +#define LGM_PWM_FAN_CON1 0x4 +#define LGM_PWM_FAN_MAX_RPM_MSK GENMASK(15, 0) + +#define LGM_PWM_MAX_RPM (BIT(16) - 1) +#define LGM_PWM_DEFAULT_RPM 4000 +#define LGM_PWM_MAX_DUTY_CYCLE (BIT(8) - 1) + +#define LGM_PWM_DC_BITS 8 + +#define LGM_PWM_PERIOD_2WIRE_NS (40 * NSEC_PER_MSEC) + +struct lgm_pwm_chip { + struct pwm_chip chip; + struct regmap *regmap; + u32 period; +}; + +static inline struct lgm_pwm_chip *to_lgm_pwm_chip(struct pwm_chip *chip) +{ + return container_of(chip, struct lgm_pwm_chip, chip); +} + +static int lgm_pwm_enable(struct pwm_chip *chip, bool enable) +{ + struct lgm_pwm_chip *pc = to_lgm_pwm_chip(chip); + struct regmap *regmap = pc->regmap; + + return regmap_update_bits(regmap, LGM_PWM_FAN_CON0, LGM_PWM_FAN_EN_MSK, + enable ? LGM_PWM_FAN_EN_EN : LGM_PWM_FAN_EN_DIS); +} + +static int lgm_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) +{ + struct lgm_pwm_chip *pc = to_lgm_pwm_chip(chip); + u32 duty_cycle, val; + int ret; + + /* The hardware only supports normal polarity and fixed period. */ + if (state->polarity != PWM_POLARITY_NORMAL || state->period < pc->period) + return -EINVAL; + + if (!state->enabled) + return lgm_pwm_enable(chip, 0); + + duty_cycle = min_t(u64, state->duty_cycle, pc->period); + val = duty_cycle * LGM_PWM_MAX_DUTY_CYCLE / pc->period; + + ret = regmap_update_bits(pc->regmap, LGM_PWM_FAN_CON0, LGM_PWM_FAN_DC_MSK, + FIELD_PREP(LGM_PWM_FAN_DC_MSK, val)); + if (ret) + return ret; + + return lgm_pwm_enable(chip, 1); +} + +static void lgm_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) +{ + struct lgm_pwm_chip *pc = to_lgm_pwm_chip(chip); + u32 duty, val; + + state->enabled = regmap_test_bits(pc->regmap, LGM_PWM_FAN_CON0, + LGM_PWM_FAN_EN_EN); + state->polarity = PWM_POLARITY_NORMAL; + state->period = pc->period; /* fixed period */ + + regmap_read(pc->regmap, LGM_PWM_FAN_CON0, &val); + duty = FIELD_GET(LGM_PWM_FAN_DC_MSK, val); + state->duty_cycle = DIV_ROUND_UP(duty * pc->period, LGM_PWM_MAX_DUTY_CYCLE); +} + +static const struct pwm_ops lgm_pwm_ops = { + .get_state = lgm_pwm_get_state, + .apply = lgm_pwm_apply, + .owner = THIS_MODULE, +}; + +static void lgm_pwm_init(struct lgm_pwm_chip *pc) +{ + struct regmap *regmap = pc->regmap; + u32 con0_val; + + con0_val = FIELD_PREP(LGM_PWM_FAN_MODE_MSK, LGM_PWM_FAN_MODE_2WIRE); + pc->period = LGM_PWM_PERIOD_2WIRE_NS; + regmap_update_bits(regmap, LGM_PWM_FAN_CON1, LGM_PWM_FAN_MAX_RPM_MSK, + LGM_PWM_DEFAULT_RPM); + regmap_update_bits(regmap, LGM_PWM_FAN_CON0, LGM_PWM_FAN_MODE_MSK, + con0_val); +} + +static const struct regmap_config lgm_pwm_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, +}; + +static void lgm_clk_release(void *data) +{ + struct clk *clk = data; + + clk_disable_unprepare(clk); +} + +static int lgm_clk_enable(struct device *dev, struct clk *clk) +{ + int ret; + + ret = clk_prepare_enable(clk); + if (ret) + return ret; + + return devm_add_action_or_reset(dev, lgm_clk_release, clk); +} + +static void lgm_reset_control_release(void *data) +{ + struct reset_control *rst = data; + + reset_control_assert(rst); +} + +static int lgm_reset_control_deassert(struct device *dev, struct reset_control *rst) +{ + int ret; + + ret = reset_control_deassert(rst); + if (ret) + return ret; + + return devm_add_action_or_reset(dev, lgm_reset_control_release, rst); +} + +static int lgm_pwm_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct reset_control *rst; + struct lgm_pwm_chip *pc; + void __iomem *io_base; + struct clk *clk; + int ret; + + pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL); + if (!pc) + return -ENOMEM; + + platform_set_drvdata(pdev, pc); + + io_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(io_base)) + return PTR_ERR(io_base); + + pc->regmap = devm_regmap_init_mmio(dev, io_base, &lgm_pwm_regmap_config); + if (IS_ERR(pc->regmap)) + return dev_err_probe(dev, PTR_ERR(pc->regmap), + "failed to init register map\n"); + + clk = devm_clk_get(dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(dev, PTR_ERR(clk), "failed to get clock\n"); + + ret = lgm_clk_enable(dev, clk); + if (ret) + return dev_err_probe(dev, ret, "failed to enable clock\n"); + + rst = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(rst)) + return dev_err_probe(dev, PTR_ERR(rst), + "failed to get reset control\n"); + + ret = lgm_reset_control_deassert(dev, rst); + if (ret) + return dev_err_probe(dev, ret, "cannot deassert reset control\n"); + + pc->chip.dev = dev; + pc->chip.ops = &lgm_pwm_ops; + pc->chip.npwm = 1; + pc->chip.base = -1; + + lgm_pwm_init(pc); + + ret = pwmchip_add(&pc->chip); + if (ret < 0) + return dev_err_probe(dev, ret, "failed to add PWM chip\n"); + + return 0; +} + +static int lgm_pwm_remove(struct platform_device *pdev) +{ + struct lgm_pwm_chip *pc = platform_get_drvdata(pdev); + + return pwmchip_remove(&pc->chip); +} + +static const struct of_device_id lgm_pwm_of_match[] = { + { .compatible = "intel,lgm-pwm" }, + { } +}; +MODULE_DEVICE_TABLE(of, lgm_pwm_of_match); + +static struct platform_driver lgm_pwm_driver = { + .driver = { + .name = "intel-pwm", + .of_match_table = lgm_pwm_of_match, + }, + .probe = lgm_pwm_probe, + .remove = lgm_pwm_remove, +}; +module_platform_driver(lgm_pwm_driver); + +MODULE_LICENSE("GPL v2");