From patchwork Thu Aug 20 04:50:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rahul Tanwar X-Patchwork-Id: 1348158 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 4BXC0352Cvz9sTR for ; Thu, 20 Aug 2020 14:50:59 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726666AbgHTEu7 (ORCPT ); Thu, 20 Aug 2020 00:50:59 -0400 Received: from mga07.intel.com ([134.134.136.100]:52441 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725768AbgHTEu6 (ORCPT ); Thu, 20 Aug 2020 00:50:58 -0400 IronPort-SDR: sA/bHdyT1Q82d+WGsMmSx9AQfUi1KHPoSncj1K7W3581qlcPb/1pZoU7LfQMNWT96KjlFa1mqJ mxVPVxCyUFpA== X-IronPort-AV: E=McAfee;i="6000,8403,9718"; a="219544087" X-IronPort-AV: E=Sophos;i="5.76,332,1592895600"; d="scan'208";a="219544087" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Aug 2020 21:50:57 -0700 IronPort-SDR: RHg2M/08/090QtQpP2oVZ0CA8gDa1dzLRQ4EU/7sXEFayoFxQj+l1xekg5Og6jnzjvpntgv+lb IxsO9AwPrdhg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,332,1592895600"; d="scan'208";a="279876777" Received: from sgsxdev001.isng.intel.com (HELO localhost) ([10.226.88.11]) by fmsmga008.fm.intel.com with ESMTP; 19 Aug 2020 21:50:54 -0700 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, rtanwar@maxlinear.com, Rahul Tanwar Subject: [PATCH v8 1/2] Add DT bindings YAML schema for PWM fan controller of LGM SoC Date: Thu, 20 Aug 2020 12:50:45 +0800 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Sender: linux-pwm-owner@vger.kernel.org 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 --- .../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 Aug 20 04:50:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rahul Tanwar X-Patchwork-Id: 1348160 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 4BXC0B3TZwz9sPC for ; Thu, 20 Aug 2020 14:51:06 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726735AbgHTEvF (ORCPT ); Thu, 20 Aug 2020 00:51:05 -0400 Received: from mga06.intel.com ([134.134.136.31]:19396 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725768AbgHTEvF (ORCPT ); Thu, 20 Aug 2020 00:51:05 -0400 IronPort-SDR: EjidnObQH1wegScMbpag5cjfkuS2lHYqFrm5nHEuqg8aLXtKOP7lknLkufgLVRQdZhU49cwysb YH9ehDVzxPqA== X-IronPort-AV: E=McAfee;i="6000,8403,9718"; a="216771070" X-IronPort-AV: E=Sophos;i="5.76,332,1592895600"; d="scan'208";a="216771070" 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; 19 Aug 2020 21:51:04 -0700 IronPort-SDR: d87ga0RKzBDAcLvd3gENWPpTiv0wzc2XtRjzSAKwAVHxNkrBtXOrT+PE4wxBJSehQR8JR72fgQ w1A1E8UJUpbg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,332,1592895600"; d="scan'208";a="278517518" Received: from sgsxdev001.isng.intel.com (HELO localhost) ([10.226.88.11]) by fmsmga007.fm.intel.com with ESMTP; 19 Aug 2020 21:51:01 -0700 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, rtanwar@maxlinear.com, Rahul Tanwar Subject: [PATCH v8 2/2] Add PWM fan controller driver for LGM SoC Date: Thu, 20 Aug 2020 12:50:46 +0800 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Sender: linux-pwm-owner@vger.kernel.org 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 --- 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 7dbcf6973d33..f7a832268c79 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 OF && HAS_IOMEM + depends on 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 2c2ba0a03557..e9431b151694 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..3d0f79b69532 --- /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 which is dependent on 2/3 or 4 + * wire fan 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 + +#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_NSECS 40000000 + +struct lgm_pwm_chip { + struct pwm_chip chip; + struct regmap *regmap; + struct clk *clk; + struct reset_control *rst; + 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) { + ret = lgm_pwm_enable(chip, 0); + return ret; + } + + 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; + + ret = lgm_pwm_enable(chip, 1); + + return ret; +} + +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_NSECS; + 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 int lgm_pwm_probe(struct platform_device *pdev) +{ + struct lgm_pwm_chip *pc; + struct device *dev = &pdev->dev; + void __iomem *io_base; + int ret; + + pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL); + if (!pc) + return -ENOMEM; + + 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)) { + ret = PTR_ERR(pc->regmap); + if (ret != -EPROBE_DEFER) + dev_err(dev, "failed to init register map: %pe\n", + pc->regmap); + return ret; + } + + pc->clk = devm_clk_get(dev, NULL); + if (IS_ERR(pc->clk)) { + ret = PTR_ERR(pc->clk); + if (ret != -EPROBE_DEFER) + dev_err(dev, "failed to get clock: %pe\n", pc->clk); + return ret; + } + + pc->rst = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(pc->rst)) { + ret = PTR_ERR(pc->rst); + if (ret != -EPROBE_DEFER) + dev_err(dev, "failed to get reset control: %pe\n", + pc->rst); + return ret; + } + + ret = reset_control_deassert(pc->rst); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(dev, "cannot deassert reset control: %pe\n", + ERR_PTR(ret)); + return ret; + } + + ret = clk_prepare_enable(pc->clk); + if (ret) { + dev_err(dev, "failed to enable clock\n"); + reset_control_assert(pc->rst); + return ret; + } + + pc->chip.dev = dev; + pc->chip.ops = &lgm_pwm_ops; + pc->chip.npwm = 1; + + lgm_pwm_init(pc); + + ret = pwmchip_add(&pc->chip); + if (ret < 0) { + dev_err(dev, "failed to add PWM chip: %pe\n", ERR_PTR(ret)); + clk_disable_unprepare(pc->clk); + reset_control_assert(pc->rst); + return ret; + } + + platform_set_drvdata(pdev, pc); + return 0; +} + +static int lgm_pwm_remove(struct platform_device *pdev) +{ + struct lgm_pwm_chip *pc = platform_get_drvdata(pdev); + int ret; + + ret = pwmchip_remove(&pc->chip); + if (ret < 0) + return ret; + + clk_disable_unprepare(pc->clk); + reset_control_assert(pc->rst); + + return 0; +} + +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);