From patchwork Wed May 31 15:19:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Hawkins, Nick" X-Patchwork-Id: 687548 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A1D25C77B7A for ; Wed, 31 May 2023 15:23:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234543AbjEaPXw (ORCPT ); Wed, 31 May 2023 11:23:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232075AbjEaPXr (ORCPT ); Wed, 31 May 2023 11:23:47 -0400 Received: from mx0a-002e3701.pphosted.com (mx0a-002e3701.pphosted.com [148.163.147.86]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DCA35121; Wed, 31 May 2023 08:23:38 -0700 (PDT) Received: from pps.filterd (m0148663.ppops.net [127.0.0.1]) by mx0a-002e3701.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 34VE7EYL016921; Wed, 31 May 2023 15:23:15 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=hpe.com; h=from : to : subject : date : message-id : in-reply-to : references; s=pps0720; bh=65CUvzbH90KUZ6KAklqHR/S7Q/djK4GczcJKvWNV2lg=; b=OYirYXu/K1nAWrgBLJqzlDnse2ADnwEkTFn3zK/+OsbzEuHTFDMiY2ulpUvGblMfAl6f twqKx3GyHCNjo661bVaM0NDMTa308M563YH350I1fygZuQVrIuR/rWhYfugMimZnWTFc rsUC4KN8fl0ViVWaR8YcBg/Zr2FoAarVEGxK9374j+fgkV0+JOhBUyT8sFLr4ifA2kYZ lRLdq3bGl9pc4WZdSxgnWEEXNdJL/nxL5G72S5WkQcA46adUM1bxvqg59pVtFjU4smtH iI1BiE76z+UJQCUIKzHxz/Q9hBUDvqUNlNgJAri/gmuJSy1WhHuPLXuL42u/5grdt231 Sw== Received: from p1lg14880.it.hpe.com (p1lg14880.it.hpe.com [16.230.97.201]) by mx0a-002e3701.pphosted.com (PPS) with ESMTPS id 3qx7qdrngy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 31 May 2023 15:23:15 +0000 Received: from p1lg14885.dc01.its.hpecorp.net (unknown [10.119.18.236]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by p1lg14880.it.hpe.com (Postfix) with ESMTPS id 67CEB800220; Wed, 31 May 2023 15:23:14 +0000 (UTC) Received: from hpe.com (unknown [16.231.227.36]) by p1lg14885.dc01.its.hpecorp.net (Postfix) with ESMTP id D5B2980B983; Wed, 31 May 2023 15:23:13 +0000 (UTC) From: nick.hawkins@hpe.com To: verdun@hpe.com, nick.hawkins@hpe.com, linus.walleij@linaro.org, brgl@bgdev.pl, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, jdelvare@suse.com, linux@roeck-us.net, andy.shevchenko@gmail.com, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org Subject: [PATCH v2 4/5] hwmon: (gxp_fan_ctrl) Provide fan info via gpio Date: Wed, 31 May 2023 10:19:17 -0500 Message-Id: <20230531151918.105223-5-nick.hawkins@hpe.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230531151918.105223-1-nick.hawkins@hpe.com> References: <20230531151918.105223-1-nick.hawkins@hpe.com> X-Proofpoint-ORIG-GUID: XQHoRmjfMi10zvqCfkxzJCL_Lqlvk2ls X-Proofpoint-GUID: XQHoRmjfMi10zvqCfkxzJCL_Lqlvk2ls X-HPE-SCL: -1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-05-31_10,2023-05-31_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxscore=0 bulkscore=0 mlxlogscore=589 clxscore=1015 adultscore=0 malwarescore=0 suspectscore=0 lowpriorityscore=0 spamscore=0 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2305310131 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Nick Hawkins The fan driver now receives fan data from GPIO via a shared variable. This is a necessity as the Host and the driver need access to the same information. Part of the changes includes removing a system power check as the GPIO driver needs it to report power state to host. Signed-off-by: Nick Hawkins --- v2: *Removed use of shared functions to GPIO in favor of a shared variable *Added build dependency on GXP GPIO driver. --- drivers/hwmon/Kconfig | 2 +- drivers/hwmon/gxp-fan-ctrl.c | 61 +++++------------------------------- drivers/hwmon/gxp-gpio.h | 13 ++++++++ 3 files changed, 21 insertions(+), 55 deletions(-) create mode 100644 drivers/hwmon/gxp-gpio.h diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 5b3b76477b0e..5c606bea31f9 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -716,7 +716,7 @@ config SENSORS_GPIO_FAN config SENSORS_GXP_FAN_CTRL tristate "HPE GXP fan controller" - depends on ARCH_HPE_GXP || COMPILE_TEST + depends on (ARCH_HPE_GXP && GPIO_GXP_PL) || COMPILE_TEST help If you say yes here you get support for GXP fan control functionality. diff --git a/drivers/hwmon/gxp-fan-ctrl.c b/drivers/hwmon/gxp-fan-ctrl.c index 0014b8b0fd41..8555231328d7 100644 --- a/drivers/hwmon/gxp-fan-ctrl.c +++ b/drivers/hwmon/gxp-fan-ctrl.c @@ -1,5 +1,5 @@ // SPDX-License-Identifier: GPL-2.0-only -/* Copyright (C) 2022 Hewlett-Packard Enterprise Development Company, L.P. */ +/* Copyright (C) 2023 Hewlett-Packard Enterprise Development Company, L.P. */ #include #include @@ -8,51 +8,28 @@ #include #include #include +#include "gxp-gpio.h" #define OFS_FAN_INST 0 /* Is 0 because plreg base will be set at INST */ #define OFS_FAN_FAIL 2 /* Is 2 bytes after base */ -#define OFS_SEVSTAT 0 /* Is 0 because fn2 base will be set at SEVSTAT */ -#define POWER_BIT 24 struct gxp_fan_ctrl_drvdata { - void __iomem *base; - void __iomem *plreg; - void __iomem *fn2; + void __iomem *base; }; static bool fan_installed(struct device *dev, int fan) { - struct gxp_fan_ctrl_drvdata *drvdata = dev_get_drvdata(dev); - u8 val; - - val = readb(drvdata->plreg + OFS_FAN_INST); - - return !!(val & BIT(fan)); + return !!(fan_presence & BIT(fan)); } static long fan_failed(struct device *dev, int fan) { - struct gxp_fan_ctrl_drvdata *drvdata = dev_get_drvdata(dev); - u8 val; - - val = readb(drvdata->plreg + OFS_FAN_FAIL); - - return !!(val & BIT(fan)); + return !!(fan_fail & BIT(fan)); } static long fan_enabled(struct device *dev, int fan) { - struct gxp_fan_ctrl_drvdata *drvdata = dev_get_drvdata(dev); - u32 val; - - /* - * Check the power status as if the platform is off the value - * reported for the PWM will be incorrect. Report fan as - * disabled. - */ - val = readl(drvdata->fn2 + OFS_SEVSTAT); - - return !!((val & BIT(POWER_BIT)) && fan_installed(dev, fan)); + return !!(fan_installed(dev, fan)); } static int gxp_pwm_write(struct device *dev, u32 attr, int channel, long val) @@ -98,20 +75,8 @@ static int gxp_fan_read(struct device *dev, u32 attr, int channel, long *val) static int gxp_pwm_read(struct device *dev, u32 attr, int channel, long *val) { struct gxp_fan_ctrl_drvdata *drvdata = dev_get_drvdata(dev); - u32 reg; - /* - * Check the power status of the platform. If the platform is off - * the value reported for the PWM will be incorrect. In this case - * report a PWM of zero. - */ - - reg = readl(drvdata->fn2 + OFS_SEVSTAT); - - if (reg & BIT(POWER_BIT)) - *val = fan_installed(dev, channel) ? readb(drvdata->base + channel) : 0; - else - *val = 0; + *val = fan_installed(dev, channel) ? readb(drvdata->base + channel) : 0; return 0; } @@ -212,18 +177,6 @@ static int gxp_fan_ctrl_probe(struct platform_device *pdev) return dev_err_probe(dev, PTR_ERR(drvdata->base), "failed to map base\n"); - drvdata->plreg = devm_platform_ioremap_resource_byname(pdev, - "pl"); - if (IS_ERR(drvdata->plreg)) - return dev_err_probe(dev, PTR_ERR(drvdata->plreg), - "failed to map plreg\n"); - - drvdata->fn2 = devm_platform_ioremap_resource_byname(pdev, - "fn2"); - if (IS_ERR(drvdata->fn2)) - return dev_err_probe(dev, PTR_ERR(drvdata->fn2), - "failed to map fn2\n"); - hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "hpe_gxp_fan_ctrl", drvdata, diff --git a/drivers/hwmon/gxp-gpio.h b/drivers/hwmon/gxp-gpio.h new file mode 100644 index 000000000000..88abe60bbe83 --- /dev/null +++ b/drivers/hwmon/gxp-gpio.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright (C) 2023 Hewlett-Packard Enterprise Development Company, L.P. */ + +#ifndef __GPIO_GXP_H__ +#define __GPIO_GXP_H__ + +#include + +/* Data provided by GPIO */ +extern u8 fan_presence; +extern u8 fan_fail; + +#endif /* __GPIO_GXP_H__ */